11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * USB hub driver. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * (C) Copyright 1999 Linus Torvalds 51da177e4SLinus Torvalds * (C) Copyright 1999 Johannes Erdfelt 61da177e4SLinus Torvalds * (C) Copyright 1999 Gregory P. Smith 71da177e4SLinus Torvalds * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds 111da177e4SLinus Torvalds #include <linux/kernel.h> 121da177e4SLinus Torvalds #include <linux/errno.h> 131da177e4SLinus Torvalds #include <linux/module.h> 141da177e4SLinus Torvalds #include <linux/moduleparam.h> 151da177e4SLinus Torvalds #include <linux/completion.h> 161da177e4SLinus Torvalds #include <linux/sched.h> 171da177e4SLinus Torvalds #include <linux/list.h> 181da177e4SLinus Torvalds #include <linux/slab.h> 191da177e4SLinus Torvalds #include <linux/ioctl.h> 201da177e4SLinus Torvalds #include <linux/usb.h> 211da177e4SLinus Torvalds #include <linux/usbdevice_fs.h> 2227729aadSEric Lescouet #include <linux/usb/hcd.h> 23925aa46bSRichard Zhao #include <linux/usb/otg.h> 2493362a87SPhil Dibowitz #include <linux/usb/quirks.h> 2532a69589SPetr Mladek #include <linux/workqueue.h> 264186ecf8SArjan van de Ven #include <linux/mutex.h> 27b04b3156STheodore Ts'o #include <linux/random.h> 28ad493e5eSLan Tianyu #include <linux/pm_qos.h> 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds #include <asm/uaccess.h> 311da177e4SLinus Torvalds #include <asm/byteorder.h> 321da177e4SLinus Torvalds 336e30d7cbSLan Tianyu #include "hub.h" 34026f3fcbSPeter Chen #include "otg_whitelist.h" 351da177e4SLinus Torvalds 36e6f30deaSMing Lei #define USB_VENDOR_GENESYS_LOGIC 0x05e3 37e6f30deaSMing Lei #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01 38e6f30deaSMing Lei 39fa286188SGreg Kroah-Hartman /* Protect struct usb_device->state and ->children members 409ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 411da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 421da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 431da177e4SLinus Torvalds 4432a69589SPetr Mladek /* workqueue to process hub events */ 4532a69589SPetr Mladek static struct workqueue_struct *hub_wq; 4632a69589SPetr Mladek static void hub_event(struct work_struct *work); 471da177e4SLinus Torvalds 48d8521afeSDan Williams /* synchronize hub-port add/remove and peering operations */ 49d8521afeSDan Williams DEFINE_MUTEX(usb_port_peer_mutex); 50d8521afeSDan Williams 511da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 5290ab5ee9SRusty Russell static bool blinkenlights = 0; 531da177e4SLinus Torvalds module_param(blinkenlights, bool, S_IRUGO); 541da177e4SLinus Torvalds MODULE_PARM_DESC(blinkenlights, "true to cycle leds on hubs"); 551da177e4SLinus Torvalds 561da177e4SLinus Torvalds /* 57fd7c519dSJaroslav Kysela * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about 58fd7c519dSJaroslav Kysela * 10 seconds to send reply for the initial 64-byte descriptor request. 59fd7c519dSJaroslav Kysela */ 60fd7c519dSJaroslav Kysela /* define initial 64-byte descriptor request timeout in milliseconds */ 61fd7c519dSJaroslav Kysela static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; 62fd7c519dSJaroslav Kysela module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); 63b9cef6c3SWu Fengguang MODULE_PARM_DESC(initial_descriptor_timeout, 64b9cef6c3SWu Fengguang "initial 64-byte descriptor request timeout in milliseconds " 65b9cef6c3SWu Fengguang "(default 5000 - 5.0 seconds)"); 66fd7c519dSJaroslav Kysela 67fd7c519dSJaroslav Kysela /* 681da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 691da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 701da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 711da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 721da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 731da177e4SLinus Torvalds * following module parameters. 741da177e4SLinus Torvalds * 751da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 761da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 771da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 781da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 791da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 801da177e4SLinus Torvalds */ 8190ab5ee9SRusty Russell static bool old_scheme_first = 0; 821da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 831da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 841da177e4SLinus Torvalds "start with the old device initialization scheme"); 851da177e4SLinus Torvalds 8690ab5ee9SRusty Russell static bool use_both_schemes = 1; 871da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 881da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 891da177e4SLinus Torvalds "try the other device initialization scheme if the " 901da177e4SLinus Torvalds "first one fails"); 911da177e4SLinus Torvalds 9232fe0198SAlan Stern /* Mutual exclusion for EHCI CF initialization. This interferes with 9332fe0198SAlan Stern * port reset on some companion controllers. 9432fe0198SAlan Stern */ 9532fe0198SAlan Stern DECLARE_RWSEM(ehci_cf_port_reset_rwsem); 9632fe0198SAlan Stern EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); 9732fe0198SAlan Stern 98ad493e5eSLan Tianyu #define HUB_DEBOUNCE_TIMEOUT 2000 99948fea37SAlan Stern #define HUB_DEBOUNCE_STEP 25 100948fea37SAlan Stern #define HUB_DEBOUNCE_STABLE 100 101948fea37SAlan Stern 10232a69589SPetr Mladek static void hub_release(struct kref *kref); 103742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev); 104742120c6SMing Lei 105131dec34SSarah Sharp static inline char *portspeed(struct usb_hub *hub, int portstatus) 1061da177e4SLinus Torvalds { 107131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 108131dec34SSarah Sharp return "5.0 Gb/s"; 109288ead45SAlan Stern if (portstatus & USB_PORT_STAT_HIGH_SPEED) 1101da177e4SLinus Torvalds return "480 Mb/s"; 111288ead45SAlan Stern else if (portstatus & USB_PORT_STAT_LOW_SPEED) 1121da177e4SLinus Torvalds return "1.5 Mb/s"; 1131da177e4SLinus Torvalds else 1141da177e4SLinus Torvalds return "12 Mb/s"; 1151da177e4SLinus Torvalds } 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 118ad493e5eSLan Tianyu struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev) 1191da177e4SLinus Torvalds { 120ff823c79SLan Tianyu if (!hdev || !hdev->actconfig || !hdev->maxchild) 12125118084SAlan Stern return NULL; 1221da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1231da177e4SLinus Torvalds } 1241da177e4SLinus Torvalds 1252d2a3167SLu Baolu int usb_device_supports_lpm(struct usb_device *udev) 126d9b2099cSSarah Sharp { 127ad87e032SAlan Stern /* Some devices have trouble with LPM */ 128ad87e032SAlan Stern if (udev->quirks & USB_QUIRK_NO_LPM) 129ad87e032SAlan Stern return 0; 130ad87e032SAlan Stern 131d9b2099cSSarah Sharp /* USB 2.1 (and greater) devices indicate LPM support through 132d9b2099cSSarah Sharp * their USB 2.0 Extended Capabilities BOS descriptor. 133d9b2099cSSarah Sharp */ 134a8425292SRupesh Tatiya if (udev->speed == USB_SPEED_HIGH || udev->speed == USB_SPEED_FULL) { 135d9b2099cSSarah Sharp if (udev->bos->ext_cap && 136d9b2099cSSarah Sharp (USB_LPM_SUPPORT & 137d9b2099cSSarah Sharp le32_to_cpu(udev->bos->ext_cap->bmAttributes))) 138d9b2099cSSarah Sharp return 1; 139d9b2099cSSarah Sharp return 0; 140d9b2099cSSarah Sharp } 14151e0a012SSarah Sharp 14225cd2882SSarah Sharp /* 14325cd2882SSarah Sharp * According to the USB 3.0 spec, all USB 3.0 devices must support LPM. 14425cd2882SSarah Sharp * However, there are some that don't, and they set the U1/U2 exit 14525cd2882SSarah Sharp * latencies to zero. 14651e0a012SSarah Sharp */ 14751e0a012SSarah Sharp if (!udev->bos->ss_cap) { 14825cd2882SSarah Sharp dev_info(&udev->dev, "No LPM exit latency info found, disabling LPM.\n"); 149d9b2099cSSarah Sharp return 0; 150d9b2099cSSarah Sharp } 15151e0a012SSarah Sharp 15225cd2882SSarah Sharp if (udev->bos->ss_cap->bU1devExitLat == 0 && 15325cd2882SSarah Sharp udev->bos->ss_cap->bU2DevExitLat == 0) { 15425cd2882SSarah Sharp if (udev->parent) 15525cd2882SSarah Sharp dev_info(&udev->dev, "LPM exit latency is zeroed, disabling LPM.\n"); 15625cd2882SSarah Sharp else 15725cd2882SSarah Sharp dev_info(&udev->dev, "We don't know the algorithms for LPM for this host, disabling LPM.\n"); 15825cd2882SSarah Sharp return 0; 15925cd2882SSarah Sharp } 16025cd2882SSarah Sharp 16125cd2882SSarah Sharp if (!udev->parent || udev->parent->lpm_capable) 16225cd2882SSarah Sharp return 1; 16351e0a012SSarah Sharp return 0; 16451e0a012SSarah Sharp } 16551e0a012SSarah Sharp 16651e0a012SSarah Sharp /* 16751e0a012SSarah Sharp * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from 16851e0a012SSarah Sharp * either U1 or U2. 16951e0a012SSarah Sharp */ 17051e0a012SSarah Sharp static void usb_set_lpm_mel(struct usb_device *udev, 17151e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 17251e0a012SSarah Sharp unsigned int udev_exit_latency, 17351e0a012SSarah Sharp struct usb_hub *hub, 17451e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 17551e0a012SSarah Sharp unsigned int hub_exit_latency) 17651e0a012SSarah Sharp { 17751e0a012SSarah Sharp unsigned int total_mel; 17851e0a012SSarah Sharp unsigned int device_mel; 17951e0a012SSarah Sharp unsigned int hub_mel; 18051e0a012SSarah Sharp 18151e0a012SSarah Sharp /* 18251e0a012SSarah Sharp * Calculate the time it takes to transition all links from the roothub 18351e0a012SSarah Sharp * to the parent hub into U0. The parent hub must then decode the 18451e0a012SSarah Sharp * packet (hub header decode latency) to figure out which port it was 18551e0a012SSarah Sharp * bound for. 18651e0a012SSarah Sharp * 18751e0a012SSarah Sharp * The Hub Header decode latency is expressed in 0.1us intervals (0x1 18851e0a012SSarah Sharp * means 0.1us). Multiply that by 100 to get nanoseconds. 18951e0a012SSarah Sharp */ 19051e0a012SSarah Sharp total_mel = hub_lpm_params->mel + 19151e0a012SSarah Sharp (hub->descriptor->u.ss.bHubHdrDecLat * 100); 19251e0a012SSarah Sharp 19351e0a012SSarah Sharp /* 19451e0a012SSarah Sharp * How long will it take to transition the downstream hub's port into 19551e0a012SSarah Sharp * U0? The greater of either the hub exit latency or the device exit 19651e0a012SSarah Sharp * latency. 19751e0a012SSarah Sharp * 19851e0a012SSarah Sharp * The BOS U1/U2 exit latencies are expressed in 1us intervals. 19951e0a012SSarah Sharp * Multiply that by 1000 to get nanoseconds. 20051e0a012SSarah Sharp */ 20151e0a012SSarah Sharp device_mel = udev_exit_latency * 1000; 20251e0a012SSarah Sharp hub_mel = hub_exit_latency * 1000; 20351e0a012SSarah Sharp if (device_mel > hub_mel) 20451e0a012SSarah Sharp total_mel += device_mel; 20551e0a012SSarah Sharp else 20651e0a012SSarah Sharp total_mel += hub_mel; 20751e0a012SSarah Sharp 20851e0a012SSarah Sharp udev_lpm_params->mel = total_mel; 20951e0a012SSarah Sharp } 21051e0a012SSarah Sharp 21151e0a012SSarah Sharp /* 21251e0a012SSarah Sharp * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate 21351e0a012SSarah Sharp * a transition from either U1 or U2. 21451e0a012SSarah Sharp */ 21551e0a012SSarah Sharp static void usb_set_lpm_pel(struct usb_device *udev, 21651e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 21751e0a012SSarah Sharp unsigned int udev_exit_latency, 21851e0a012SSarah Sharp struct usb_hub *hub, 21951e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 22051e0a012SSarah Sharp unsigned int hub_exit_latency, 22151e0a012SSarah Sharp unsigned int port_to_port_exit_latency) 22251e0a012SSarah Sharp { 22351e0a012SSarah Sharp unsigned int first_link_pel; 22451e0a012SSarah Sharp unsigned int hub_pel; 22551e0a012SSarah Sharp 22651e0a012SSarah Sharp /* 22751e0a012SSarah Sharp * First, the device sends an LFPS to transition the link between the 22851e0a012SSarah Sharp * device and the parent hub into U0. The exit latency is the bigger of 22951e0a012SSarah Sharp * the device exit latency or the hub exit latency. 23051e0a012SSarah Sharp */ 23151e0a012SSarah Sharp if (udev_exit_latency > hub_exit_latency) 23251e0a012SSarah Sharp first_link_pel = udev_exit_latency * 1000; 23351e0a012SSarah Sharp else 23451e0a012SSarah Sharp first_link_pel = hub_exit_latency * 1000; 23551e0a012SSarah Sharp 23651e0a012SSarah Sharp /* 23751e0a012SSarah Sharp * When the hub starts to receive the LFPS, there is a slight delay for 23851e0a012SSarah Sharp * it to figure out that one of the ports is sending an LFPS. Then it 23951e0a012SSarah Sharp * will forward the LFPS to its upstream link. The exit latency is the 24051e0a012SSarah Sharp * delay, plus the PEL that we calculated for this hub. 24151e0a012SSarah Sharp */ 24251e0a012SSarah Sharp hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel; 24351e0a012SSarah Sharp 24451e0a012SSarah Sharp /* 24551e0a012SSarah Sharp * According to figure C-7 in the USB 3.0 spec, the PEL for this device 24651e0a012SSarah Sharp * is the greater of the two exit latencies. 24751e0a012SSarah Sharp */ 24851e0a012SSarah Sharp if (first_link_pel > hub_pel) 24951e0a012SSarah Sharp udev_lpm_params->pel = first_link_pel; 25051e0a012SSarah Sharp else 25151e0a012SSarah Sharp udev_lpm_params->pel = hub_pel; 25251e0a012SSarah Sharp } 25351e0a012SSarah Sharp 25451e0a012SSarah Sharp /* 25551e0a012SSarah Sharp * Set the System Exit Latency (SEL) to indicate the total worst-case time from 25651e0a012SSarah Sharp * when a device initiates a transition to U0, until when it will receive the 25751e0a012SSarah Sharp * first packet from the host controller. 25851e0a012SSarah Sharp * 25951e0a012SSarah Sharp * Section C.1.5.1 describes the four components to this: 26051e0a012SSarah Sharp * - t1: device PEL 26151e0a012SSarah Sharp * - t2: time for the ERDY to make it from the device to the host. 26251e0a012SSarah Sharp * - t3: a host-specific delay to process the ERDY. 26351e0a012SSarah Sharp * - t4: time for the packet to make it from the host to the device. 26451e0a012SSarah Sharp * 26551e0a012SSarah Sharp * t3 is specific to both the xHCI host and the platform the host is integrated 26651e0a012SSarah Sharp * into. The Intel HW folks have said it's negligible, FIXME if a different 26751e0a012SSarah Sharp * vendor says otherwise. 26851e0a012SSarah Sharp */ 26951e0a012SSarah Sharp static void usb_set_lpm_sel(struct usb_device *udev, 27051e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params) 27151e0a012SSarah Sharp { 27251e0a012SSarah Sharp struct usb_device *parent; 27351e0a012SSarah Sharp unsigned int num_hubs; 27451e0a012SSarah Sharp unsigned int total_sel; 27551e0a012SSarah Sharp 27651e0a012SSarah Sharp /* t1 = device PEL */ 27751e0a012SSarah Sharp total_sel = udev_lpm_params->pel; 27851e0a012SSarah Sharp /* How many external hubs are in between the device & the root port. */ 27951e0a012SSarah Sharp for (parent = udev->parent, num_hubs = 0; parent->parent; 28051e0a012SSarah Sharp parent = parent->parent) 28151e0a012SSarah Sharp num_hubs++; 28251e0a012SSarah Sharp /* t2 = 2.1us + 250ns * (num_hubs - 1) */ 28351e0a012SSarah Sharp if (num_hubs > 0) 28451e0a012SSarah Sharp total_sel += 2100 + 250 * (num_hubs - 1); 28551e0a012SSarah Sharp 28651e0a012SSarah Sharp /* t4 = 250ns * num_hubs */ 28751e0a012SSarah Sharp total_sel += 250 * num_hubs; 28851e0a012SSarah Sharp 28951e0a012SSarah Sharp udev_lpm_params->sel = total_sel; 29051e0a012SSarah Sharp } 29151e0a012SSarah Sharp 29251e0a012SSarah Sharp static void usb_set_lpm_parameters(struct usb_device *udev) 29351e0a012SSarah Sharp { 29451e0a012SSarah Sharp struct usb_hub *hub; 29551e0a012SSarah Sharp unsigned int port_to_port_delay; 29651e0a012SSarah Sharp unsigned int udev_u1_del; 29751e0a012SSarah Sharp unsigned int udev_u2_del; 29851e0a012SSarah Sharp unsigned int hub_u1_del; 29951e0a012SSarah Sharp unsigned int hub_u2_del; 30051e0a012SSarah Sharp 30151e0a012SSarah Sharp if (!udev->lpm_capable || udev->speed != USB_SPEED_SUPER) 30251e0a012SSarah Sharp return; 30351e0a012SSarah Sharp 304ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 30551e0a012SSarah Sharp /* It doesn't take time to transition the roothub into U0, since it 30651e0a012SSarah Sharp * doesn't have an upstream link. 30751e0a012SSarah Sharp */ 30851e0a012SSarah Sharp if (!hub) 30951e0a012SSarah Sharp return; 31051e0a012SSarah Sharp 31151e0a012SSarah Sharp udev_u1_del = udev->bos->ss_cap->bU1devExitLat; 3124d967995SXenia Ragiadakou udev_u2_del = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat); 31351e0a012SSarah Sharp hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat; 3144d967995SXenia Ragiadakou hub_u2_del = le16_to_cpu(udev->parent->bos->ss_cap->bU2DevExitLat); 31551e0a012SSarah Sharp 31651e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del, 31751e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del); 31851e0a012SSarah Sharp 31951e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del, 32051e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del); 32151e0a012SSarah Sharp 32251e0a012SSarah Sharp /* 32351e0a012SSarah Sharp * Appendix C, section C.2.2.2, says that there is a slight delay from 32451e0a012SSarah Sharp * when the parent hub notices the downstream port is trying to 32551e0a012SSarah Sharp * transition to U0 to when the hub initiates a U0 transition on its 32651e0a012SSarah Sharp * upstream port. The section says the delays are tPort2PortU1EL and 32751e0a012SSarah Sharp * tPort2PortU2EL, but it doesn't define what they are. 32851e0a012SSarah Sharp * 32951e0a012SSarah Sharp * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking 33051e0a012SSarah Sharp * about the same delays. Use the maximum delay calculations from those 33151e0a012SSarah Sharp * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For 33251e0a012SSarah Sharp * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I 33351e0a012SSarah Sharp * assume the device exit latencies they are talking about are the hub 33451e0a012SSarah Sharp * exit latencies. 33551e0a012SSarah Sharp * 33651e0a012SSarah Sharp * What do we do if the U2 exit latency is less than the U1 exit 33751e0a012SSarah Sharp * latency? It's possible, although not likely... 33851e0a012SSarah Sharp */ 33951e0a012SSarah Sharp port_to_port_delay = 1; 34051e0a012SSarah Sharp 34151e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del, 34251e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del, 34351e0a012SSarah Sharp port_to_port_delay); 34451e0a012SSarah Sharp 34551e0a012SSarah Sharp if (hub_u2_del > hub_u1_del) 34651e0a012SSarah Sharp port_to_port_delay = 1 + hub_u2_del - hub_u1_del; 34751e0a012SSarah Sharp else 34851e0a012SSarah Sharp port_to_port_delay = 1 + hub_u1_del; 34951e0a012SSarah Sharp 35051e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del, 35151e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del, 35251e0a012SSarah Sharp port_to_port_delay); 35351e0a012SSarah Sharp 35451e0a012SSarah Sharp /* Now that we've got PEL, calculate SEL. */ 35551e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u1_params); 35651e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u2_params); 35751e0a012SSarah Sharp } 358d9b2099cSSarah Sharp 3591da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 360dbe79bbeSJohn Youn static int get_hub_descriptor(struct usb_device *hdev, void *data) 3611da177e4SLinus Torvalds { 362dbe79bbeSJohn Youn int i, ret, size; 363dbe79bbeSJohn Youn unsigned dtype; 364dbe79bbeSJohn Youn 365dbe79bbeSJohn Youn if (hub_is_superspeed(hdev)) { 366dbe79bbeSJohn Youn dtype = USB_DT_SS_HUB; 367dbe79bbeSJohn Youn size = USB_DT_SS_HUB_SIZE; 368dbe79bbeSJohn Youn } else { 369dbe79bbeSJohn Youn dtype = USB_DT_HUB; 370dbe79bbeSJohn Youn size = sizeof(struct usb_hub_descriptor); 371dbe79bbeSJohn Youn } 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 3741da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3751da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 376dbe79bbeSJohn Youn dtype << 8, 0, data, size, 3771da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 3781da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 3791da177e4SLinus Torvalds return ret; 3801da177e4SLinus Torvalds } 3811da177e4SLinus Torvalds return -EINVAL; 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds 3841da177e4SLinus Torvalds /* 3851da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 3861da177e4SLinus Torvalds */ 3871da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 3881da177e4SLinus Torvalds { 3891da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 3901da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 3911da177e4SLinus Torvalds } 3921da177e4SLinus Torvalds 3931da177e4SLinus Torvalds /* 3941da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 3951da177e4SLinus Torvalds */ 396ad493e5eSLan Tianyu int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature) 3971da177e4SLinus Torvalds { 3981da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 3991da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 4001da177e4SLinus Torvalds NULL, 0, 1000); 4011da177e4SLinus Torvalds } 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds /* 4041da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 4051da177e4SLinus Torvalds */ 4061da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 4071da177e4SLinus Torvalds { 4081da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4091da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 4101da177e4SLinus Torvalds NULL, 0, 1000); 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds 413d99f6b41SDan Williams static char *to_led_name(int selector) 414d99f6b41SDan Williams { 415d99f6b41SDan Williams switch (selector) { 416d99f6b41SDan Williams case HUB_LED_AMBER: 417d99f6b41SDan Williams return "amber"; 418d99f6b41SDan Williams case HUB_LED_GREEN: 419d99f6b41SDan Williams return "green"; 420d99f6b41SDan Williams case HUB_LED_OFF: 421d99f6b41SDan Williams return "off"; 422d99f6b41SDan Williams case HUB_LED_AUTO: 423d99f6b41SDan Williams return "auto"; 424d99f6b41SDan Williams default: 425d99f6b41SDan Williams return "??"; 426d99f6b41SDan Williams } 427d99f6b41SDan Williams } 428d99f6b41SDan Williams 4291da177e4SLinus Torvalds /* 4301da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 4311da177e4SLinus Torvalds * for info about using port indicators 4321da177e4SLinus Torvalds */ 433d99f6b41SDan Williams static void set_port_led(struct usb_hub *hub, int port1, int selector) 4341da177e4SLinus Torvalds { 435d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 436d99f6b41SDan Williams int status; 437d99f6b41SDan Williams 438d99f6b41SDan Williams status = set_port_feature(hub->hdev, (selector << 8) | port1, 4391da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 440d99f6b41SDan Williams dev_dbg(&port_dev->dev, "indicator %s status %d\n", 441d99f6b41SDan Williams to_led_name(selector), status); 4421da177e4SLinus Torvalds } 4431da177e4SLinus Torvalds 4441da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 4451da177e4SLinus Torvalds 446c4028958SDavid Howells static void led_work(struct work_struct *work) 4471da177e4SLinus Torvalds { 448c4028958SDavid Howells struct usb_hub *hub = 449c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 4501da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4511da177e4SLinus Torvalds unsigned i; 4521da177e4SLinus Torvalds unsigned changed = 0; 4531da177e4SLinus Torvalds int cursor = -1; 4541da177e4SLinus Torvalds 4551da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 4561da177e4SLinus Torvalds return; 4571da177e4SLinus Torvalds 4583bbc47d8SKrzysztof Mazur for (i = 0; i < hdev->maxchild; i++) { 4591da177e4SLinus Torvalds unsigned selector, mode; 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds /* 30%-50% duty cycle */ 4621da177e4SLinus Torvalds 4631da177e4SLinus Torvalds switch (hub->indicator[i]) { 4641da177e4SLinus Torvalds /* cycle marker */ 4651da177e4SLinus Torvalds case INDICATOR_CYCLE: 4661da177e4SLinus Torvalds cursor = i; 4671da177e4SLinus Torvalds selector = HUB_LED_AUTO; 4681da177e4SLinus Torvalds mode = INDICATOR_AUTO; 4691da177e4SLinus Torvalds break; 4701da177e4SLinus Torvalds /* blinking green = sw attention */ 4711da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 4721da177e4SLinus Torvalds selector = HUB_LED_GREEN; 4731da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 4741da177e4SLinus Torvalds break; 4751da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 4761da177e4SLinus Torvalds selector = HUB_LED_OFF; 4771da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 4781da177e4SLinus Torvalds break; 4791da177e4SLinus Torvalds /* blinking amber = hw attention */ 4801da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 4811da177e4SLinus Torvalds selector = HUB_LED_AMBER; 4821da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 4831da177e4SLinus Torvalds break; 4841da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 4851da177e4SLinus Torvalds selector = HUB_LED_OFF; 4861da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 4871da177e4SLinus Torvalds break; 4881da177e4SLinus Torvalds /* blink green/amber = reserved */ 4891da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 4901da177e4SLinus Torvalds selector = HUB_LED_GREEN; 4911da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 4921da177e4SLinus Torvalds break; 4931da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 4941da177e4SLinus Torvalds selector = HUB_LED_AMBER; 4951da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 4961da177e4SLinus Torvalds break; 4971da177e4SLinus Torvalds default: 4981da177e4SLinus Torvalds continue; 4991da177e4SLinus Torvalds } 5001da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 5011da177e4SLinus Torvalds changed = 1; 5021da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 5031da177e4SLinus Torvalds hub->indicator[i] = mode; 5041da177e4SLinus Torvalds } 5051da177e4SLinus Torvalds if (!changed && blinkenlights) { 5061da177e4SLinus Torvalds cursor++; 5073bbc47d8SKrzysztof Mazur cursor %= hdev->maxchild; 5081da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 5091da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 5101da177e4SLinus Torvalds changed++; 5111da177e4SLinus Torvalds } 5121da177e4SLinus Torvalds if (changed) 51322f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 51422f6a0f0SShaibal Dutta &hub->leds, LED_CYCLE_PERIOD); 5151da177e4SLinus Torvalds } 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 5181da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 5191da177e4SLinus Torvalds #define USB_STS_RETRIES 5 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds /* 5221da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 5231da177e4SLinus Torvalds */ 5241da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 5251da177e4SLinus Torvalds struct usb_hub_status *data) 5261da177e4SLinus Torvalds { 5271da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5281da177e4SLinus Torvalds 5293824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 5303824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 5311da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 5321da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 5331da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 5341da177e4SLinus Torvalds } 5351da177e4SLinus Torvalds return status; 5361da177e4SLinus Torvalds } 5371da177e4SLinus Torvalds 5381da177e4SLinus Torvalds /* 5391da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 5401da177e4SLinus Torvalds */ 5411da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 5421da177e4SLinus Torvalds struct usb_port_status *data) 5431da177e4SLinus Torvalds { 5441da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5451da177e4SLinus Torvalds 5463824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 5473824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 5481da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 5491da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 5501da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 5511da177e4SLinus Torvalds } 5521da177e4SLinus Torvalds return status; 5531da177e4SLinus Torvalds } 5541da177e4SLinus Torvalds 5553eb14915SAlan Stern static int hub_port_status(struct usb_hub *hub, int port1, 5563eb14915SAlan Stern u16 *status, u16 *change) 5573eb14915SAlan Stern { 5583eb14915SAlan Stern int ret; 5593eb14915SAlan Stern 5603eb14915SAlan Stern mutex_lock(&hub->status_mutex); 5613eb14915SAlan Stern ret = get_port_status(hub->hdev, port1, &hub->status->port); 5623eb14915SAlan Stern if (ret < 4) { 563e9e88fb7SAlan Stern if (ret != -ENODEV) 5643eb14915SAlan Stern dev_err(hub->intfdev, 5653eb14915SAlan Stern "%s failed (err = %d)\n", __func__, ret); 5663eb14915SAlan Stern if (ret >= 0) 5673eb14915SAlan Stern ret = -EIO; 5683eb14915SAlan Stern } else { 5693eb14915SAlan Stern *status = le16_to_cpu(hub->status->port.wPortStatus); 5703eb14915SAlan Stern *change = le16_to_cpu(hub->status->port.wPortChange); 571dbe79bbeSJohn Youn 5723eb14915SAlan Stern ret = 0; 5733eb14915SAlan Stern } 5743eb14915SAlan Stern mutex_unlock(&hub->status_mutex); 5753eb14915SAlan Stern return ret; 5763eb14915SAlan Stern } 5773eb14915SAlan Stern 57832a69589SPetr Mladek static void kick_hub_wq(struct usb_hub *hub) 5791da177e4SLinus Torvalds { 58032a69589SPetr Mladek struct usb_interface *intf; 5811da177e4SLinus Torvalds 58232a69589SPetr Mladek if (hub->disconnected || work_pending(&hub->events)) 58332a69589SPetr Mladek return; 5848e4ceb38SAlan Stern 58532a69589SPetr Mladek /* 58632a69589SPetr Mladek * Suppress autosuspend until the event is proceed. 58732a69589SPetr Mladek * 58832a69589SPetr Mladek * Be careful and make sure that the symmetric operation is 58932a69589SPetr Mladek * always called. We are here only when there is no pending 59032a69589SPetr Mladek * work for this hub. Therefore put the interface either when 59132a69589SPetr Mladek * the new work is called or when it is canceled. 59232a69589SPetr Mladek */ 59332a69589SPetr Mladek intf = to_usb_interface(hub->intfdev); 59432a69589SPetr Mladek usb_autopm_get_interface_no_resume(intf); 59532a69589SPetr Mladek kref_get(&hub->kref); 59632a69589SPetr Mladek 59732a69589SPetr Mladek if (queue_work(hub_wq, &hub->events)) 59832a69589SPetr Mladek return; 59932a69589SPetr Mladek 60032a69589SPetr Mladek /* the work has already been scheduled */ 60132a69589SPetr Mladek usb_autopm_put_interface_async(intf); 60232a69589SPetr Mladek kref_put(&hub->kref, hub_release); 6031da177e4SLinus Torvalds } 6041da177e4SLinus Torvalds 60559d48b3fSPetr Mladek void usb_kick_hub_wq(struct usb_device *hdev) 6061da177e4SLinus Torvalds { 607ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 60825118084SAlan Stern 60925118084SAlan Stern if (hub) 61032a69589SPetr Mladek kick_hub_wq(hub); 6111da177e4SLinus Torvalds } 6121da177e4SLinus Torvalds 6134ee823b8SSarah Sharp /* 6144ee823b8SSarah Sharp * Let the USB core know that a USB 3.0 device has sent a Function Wake Device 6154ee823b8SSarah Sharp * Notification, which indicates it had initiated remote wakeup. 6164ee823b8SSarah Sharp * 6174ee823b8SSarah Sharp * USB 3.0 hubs do not report the port link state change from U3 to U0 when the 6184ee823b8SSarah Sharp * device initiates resume, so the USB core will not receive notice of the 6194ee823b8SSarah Sharp * resume through the normal hub interrupt URB. 6204ee823b8SSarah Sharp */ 6214ee823b8SSarah Sharp void usb_wakeup_notification(struct usb_device *hdev, 6224ee823b8SSarah Sharp unsigned int portnum) 6234ee823b8SSarah Sharp { 6244ee823b8SSarah Sharp struct usb_hub *hub; 6254ee823b8SSarah Sharp 6264ee823b8SSarah Sharp if (!hdev) 6274ee823b8SSarah Sharp return; 6284ee823b8SSarah Sharp 629ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(hdev); 6304ee823b8SSarah Sharp if (hub) { 6314ee823b8SSarah Sharp set_bit(portnum, hub->wakeup_bits); 63232a69589SPetr Mladek kick_hub_wq(hub); 6334ee823b8SSarah Sharp } 6344ee823b8SSarah Sharp } 6354ee823b8SSarah Sharp EXPORT_SYMBOL_GPL(usb_wakeup_notification); 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 6387d12e780SDavid Howells static void hub_irq(struct urb *urb) 6391da177e4SLinus Torvalds { 640ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 641e015268dSAlan Stern int status = urb->status; 64271d2718fSRoel Kluin unsigned i; 6431da177e4SLinus Torvalds unsigned long bits; 6441da177e4SLinus Torvalds 645e015268dSAlan Stern switch (status) { 6461da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 6471da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 6481da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 6491da177e4SLinus Torvalds return; 6501da177e4SLinus Torvalds 6511da177e4SLinus Torvalds default: /* presumably an error */ 6521da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 653e015268dSAlan Stern dev_dbg(hub->intfdev, "transfer --> %d\n", status); 6541da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 6551da177e4SLinus Torvalds goto resubmit; 656e015268dSAlan Stern hub->error = status; 6571da177e4SLinus Torvalds /* FALL THROUGH */ 6581da177e4SLinus Torvalds 65937ebb549SPetr Mladek /* let hub_wq handle things */ 6601da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 6611da177e4SLinus Torvalds bits = 0; 6621da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 6631da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 6641da177e4SLinus Torvalds << (i*8); 6651da177e4SLinus Torvalds hub->event_bits[0] = bits; 6661da177e4SLinus Torvalds break; 6671da177e4SLinus Torvalds } 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvalds hub->nerrors = 0; 6701da177e4SLinus Torvalds 67137ebb549SPetr Mladek /* Something happened, let hub_wq figure it out */ 67232a69589SPetr Mladek kick_hub_wq(hub); 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds resubmit: 6751da177e4SLinus Torvalds if (hub->quiescing) 6761da177e4SLinus Torvalds return; 6771da177e4SLinus Torvalds 678088a3daeSKris Borer status = usb_submit_urb(hub->urb, GFP_ATOMIC); 679088a3daeSKris Borer if (status != 0 && status != -ENODEV && status != -EPERM) 6801da177e4SLinus Torvalds dev_err(hub->intfdev, "resubmit --> %d\n", status); 6811da177e4SLinus Torvalds } 6821da177e4SLinus Torvalds 6831da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 6841da177e4SLinus Torvalds static inline int 6851da177e4SLinus Torvalds hub_clear_tt_buffer(struct usb_device *hdev, u16 devinfo, u16 tt) 6861da177e4SLinus Torvalds { 6872c7b871bSWilliam Gulland /* Need to clear both directions for control ep */ 6882c7b871bSWilliam Gulland if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) == 6892c7b871bSWilliam Gulland USB_ENDPOINT_XFER_CONTROL) { 6902c7b871bSWilliam Gulland int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 6912c7b871bSWilliam Gulland HUB_CLEAR_TT_BUFFER, USB_RT_PORT, 6922c7b871bSWilliam Gulland devinfo ^ 0x8000, tt, NULL, 0, 1000); 6932c7b871bSWilliam Gulland if (status) 6942c7b871bSWilliam Gulland return status; 6952c7b871bSWilliam Gulland } 696c2f6595fSAlan Stern return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 6971da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 6981da177e4SLinus Torvalds tt, NULL, 0, 1000); 6991da177e4SLinus Torvalds } 7001da177e4SLinus Torvalds 7011da177e4SLinus Torvalds /* 70237ebb549SPetr Mladek * enumeration blocks hub_wq for a long time. we use keventd instead, since 7031da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 7041da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 7051da177e4SLinus Torvalds * both can talk to the same hub concurrently. 7061da177e4SLinus Torvalds */ 707cb88a1b8SAlan Stern static void hub_tt_work(struct work_struct *work) 7081da177e4SLinus Torvalds { 709c4028958SDavid Howells struct usb_hub *hub = 710cb88a1b8SAlan Stern container_of(work, struct usb_hub, tt.clear_work); 7111da177e4SLinus Torvalds unsigned long flags; 7121da177e4SLinus Torvalds 7131da177e4SLinus Torvalds spin_lock_irqsave(&hub->tt.lock, flags); 7143b6054daSOctavian Purdila while (!list_empty(&hub->tt.clear_list)) { 715d0f830d3SH Hartley Sweeten struct list_head *next; 7161da177e4SLinus Torvalds struct usb_tt_clear *clear; 7171da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 718cb88a1b8SAlan Stern const struct hc_driver *drv; 7191da177e4SLinus Torvalds int status; 7201da177e4SLinus Torvalds 721d0f830d3SH Hartley Sweeten next = hub->tt.clear_list.next; 722d0f830d3SH Hartley Sweeten clear = list_entry(next, struct usb_tt_clear, clear_list); 7231da177e4SLinus Torvalds list_del(&clear->clear_list); 7241da177e4SLinus Torvalds 7251da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 7261da177e4SLinus Torvalds spin_unlock_irqrestore(&hub->tt.lock, flags); 7271da177e4SLinus Torvalds status = hub_clear_tt_buffer(hdev, clear->devinfo, clear->tt); 728e9e88fb7SAlan Stern if (status && status != -ENODEV) 7291da177e4SLinus Torvalds dev_err(&hdev->dev, 7301da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 7311da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 732cb88a1b8SAlan Stern 733cb88a1b8SAlan Stern /* Tell the HCD, even if the operation failed */ 734cb88a1b8SAlan Stern drv = clear->hcd->driver; 735cb88a1b8SAlan Stern if (drv->clear_tt_buffer_complete) 736cb88a1b8SAlan Stern (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); 737cb88a1b8SAlan Stern 7381da177e4SLinus Torvalds kfree(clear); 739cb88a1b8SAlan Stern spin_lock_irqsave(&hub->tt.lock, flags); 7401da177e4SLinus Torvalds } 7411da177e4SLinus Torvalds spin_unlock_irqrestore(&hub->tt.lock, flags); 7421da177e4SLinus Torvalds } 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds /** 745971fcd49SLan Tianyu * usb_hub_set_port_power - control hub port's power state 74641341261SMathias Nyman * @hdev: USB device belonging to the usb hub 74741341261SMathias Nyman * @hub: target hub 748971fcd49SLan Tianyu * @port1: port index 749971fcd49SLan Tianyu * @set: expected status 750971fcd49SLan Tianyu * 751971fcd49SLan Tianyu * call this function to control port's power via setting or 752971fcd49SLan Tianyu * clearing the port's PORT_POWER feature. 753626f090cSYacine Belkadi * 754626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 755971fcd49SLan Tianyu */ 75641341261SMathias Nyman int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, 75741341261SMathias Nyman int port1, bool set) 758971fcd49SLan Tianyu { 759971fcd49SLan Tianyu int ret; 760971fcd49SLan Tianyu 761971fcd49SLan Tianyu if (set) 762971fcd49SLan Tianyu ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 763971fcd49SLan Tianyu else 764ad493e5eSLan Tianyu ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 765ad493e5eSLan Tianyu 766d5c3834eSDan Williams if (ret) 767971fcd49SLan Tianyu return ret; 768d5c3834eSDan Williams 769d5c3834eSDan Williams if (set) 770d5c3834eSDan Williams set_bit(port1, hub->power_bits); 771d5c3834eSDan Williams else 772d5c3834eSDan Williams clear_bit(port1, hub->power_bits); 773d5c3834eSDan Williams return 0; 774971fcd49SLan Tianyu } 775971fcd49SLan Tianyu 776971fcd49SLan Tianyu /** 777cb88a1b8SAlan Stern * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub 778cb88a1b8SAlan Stern * @urb: an URB associated with the failed or incomplete split transaction 7791da177e4SLinus Torvalds * 7801da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 7811da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 7821da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 7831da177e4SLinus Torvalds * interrupt context. 7841da177e4SLinus Torvalds * 7851da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 7861da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 787626f090cSYacine Belkadi * 788626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 7891da177e4SLinus Torvalds */ 790cb88a1b8SAlan Stern int usb_hub_clear_tt_buffer(struct urb *urb) 7911da177e4SLinus Torvalds { 792cb88a1b8SAlan Stern struct usb_device *udev = urb->dev; 793cb88a1b8SAlan Stern int pipe = urb->pipe; 7941da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 7951da177e4SLinus Torvalds unsigned long flags; 7961da177e4SLinus Torvalds struct usb_tt_clear *clear; 7971da177e4SLinus Torvalds 7981da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 7991da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 8001da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 8011da177e4SLinus Torvalds */ 802d544d273SGreg Kroah-Hartman clear = kmalloc(sizeof *clear, GFP_ATOMIC); 803d544d273SGreg Kroah-Hartman if (clear == NULL) { 8041da177e4SLinus Torvalds dev_err(&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 8051da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 806cb88a1b8SAlan Stern return -ENOMEM; 8071da177e4SLinus Torvalds } 8081da177e4SLinus Torvalds 8091da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 8101da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 8111da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 8121da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 8131da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol(pipe) 8141da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 8151da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 8161da177e4SLinus Torvalds if (usb_pipein(pipe)) 8171da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 8181da177e4SLinus Torvalds 819cb88a1b8SAlan Stern /* info for completion callback */ 820cb88a1b8SAlan Stern clear->hcd = bus_to_hcd(udev->bus); 821cb88a1b8SAlan Stern clear->ep = urb->ep; 822cb88a1b8SAlan Stern 8231da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 8241da177e4SLinus Torvalds spin_lock_irqsave(&tt->lock, flags); 8251da177e4SLinus Torvalds list_add_tail(&clear->clear_list, &tt->clear_list); 826cb88a1b8SAlan Stern schedule_work(&tt->clear_work); 8271da177e4SLinus Torvalds spin_unlock_irqrestore(&tt->lock, flags); 828cb88a1b8SAlan Stern return 0; 8291da177e4SLinus Torvalds } 830cb88a1b8SAlan Stern EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); 8311da177e4SLinus Torvalds 8327ad3c470SDan Williams static void hub_power_on(struct usb_hub *hub, bool do_delay) 8331da177e4SLinus Torvalds { 8341da177e4SLinus Torvalds int port1; 8351da177e4SLinus Torvalds 8364489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 8374489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 8384489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 8394489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 8404489a571SAlan Stern * unless we send these messages to the hub. 8414489a571SAlan Stern */ 8429262c19dSDan Williams if (hub_is_port_power_switchable(hub)) 8431da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 8444489a571SAlan Stern else 8454489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 8464489a571SAlan Stern "non-switchable hub\n"); 8473bbc47d8SKrzysztof Mazur for (port1 = 1; port1 <= hub->hdev->maxchild; port1++) 848d5c3834eSDan Williams if (test_bit(port1, hub->power_bits)) 8494489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 850ad493e5eSLan Tianyu else 851ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 852ad493e5eSLan Tianyu USB_PORT_FEAT_POWER); 8538520f380SAlan Stern if (do_delay) 8547ad3c470SDan Williams msleep(hub_power_on_good_delay(hub)); 8551da177e4SLinus Torvalds } 8561da177e4SLinus Torvalds 8571da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 8581da177e4SLinus Torvalds u16 *status, u16 *change) 8591da177e4SLinus Torvalds { 8601da177e4SLinus Torvalds int ret; 8611da177e4SLinus Torvalds 862db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 8631da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 864e9e88fb7SAlan Stern if (ret < 0) { 865e9e88fb7SAlan Stern if (ret != -ENODEV) 8661da177e4SLinus Torvalds dev_err(hub->intfdev, 867441b62c1SHarvey Harrison "%s failed (err = %d)\n", __func__, ret); 868e9e88fb7SAlan Stern } else { 8691da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 8701da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 8711da177e4SLinus Torvalds ret = 0; 8721da177e4SLinus Torvalds } 873db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 8741da177e4SLinus Torvalds return ret; 8751da177e4SLinus Torvalds } 8761da177e4SLinus Torvalds 87741e7e056SSarah Sharp static int hub_set_port_link_state(struct usb_hub *hub, int port1, 87841e7e056SSarah Sharp unsigned int link_status) 87941e7e056SSarah Sharp { 88041e7e056SSarah Sharp return set_port_feature(hub->hdev, 88141e7e056SSarah Sharp port1 | (link_status << 3), 88241e7e056SSarah Sharp USB_PORT_FEAT_LINK_STATE); 88341e7e056SSarah Sharp } 88441e7e056SSarah Sharp 88541e7e056SSarah Sharp /* 88641e7e056SSarah Sharp * If USB 3.0 ports are placed into the Disabled state, they will no longer 88741e7e056SSarah Sharp * detect any device connects or disconnects. This is generally not what the 88841e7e056SSarah Sharp * USB core wants, since it expects a disabled port to produce a port status 88941e7e056SSarah Sharp * change event when a new device connects. 89041e7e056SSarah Sharp * 89141e7e056SSarah Sharp * Instead, set the link state to Disabled, wait for the link to settle into 89241e7e056SSarah Sharp * that state, clear any change bits, and then put the port into the RxDetect 89341e7e056SSarah Sharp * state. 89441e7e056SSarah Sharp */ 89541e7e056SSarah Sharp static int hub_usb3_port_disable(struct usb_hub *hub, int port1) 89641e7e056SSarah Sharp { 89741e7e056SSarah Sharp int ret; 89841e7e056SSarah Sharp int total_time; 89941e7e056SSarah Sharp u16 portchange, portstatus; 90041e7e056SSarah Sharp 90141e7e056SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 90241e7e056SSarah Sharp return -EINVAL; 90341e7e056SSarah Sharp 904bb86cf56SGavin Guo ret = hub_port_status(hub, port1, &portstatus, &portchange); 905bb86cf56SGavin Guo if (ret < 0) 906bb86cf56SGavin Guo return ret; 907bb86cf56SGavin Guo 908bb86cf56SGavin Guo /* 909bb86cf56SGavin Guo * USB controller Advanced Micro Devices, Inc. [AMD] FCH USB XHCI 910bb86cf56SGavin Guo * Controller [1022:7814] will have spurious result making the following 911bb86cf56SGavin Guo * usb 3.0 device hotplugging route to the 2.0 root hub and recognized 912bb86cf56SGavin Guo * as high-speed device if we set the usb 3.0 port link state to 913bb86cf56SGavin Guo * Disabled. Since it's already in USB_SS_PORT_LS_RX_DETECT state, we 914bb86cf56SGavin Guo * check the state here to avoid the bug. 915bb86cf56SGavin Guo */ 916bb86cf56SGavin Guo if ((portstatus & USB_PORT_STAT_LINK_STATE) == 917bb86cf56SGavin Guo USB_SS_PORT_LS_RX_DETECT) { 918bb86cf56SGavin Guo dev_dbg(&hub->ports[port1 - 1]->dev, 919bb86cf56SGavin Guo "Not disabling port; link state is RxDetect\n"); 920bb86cf56SGavin Guo return ret; 921bb86cf56SGavin Guo } 922bb86cf56SGavin Guo 92341e7e056SSarah Sharp ret = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_SS_DISABLED); 924e9e88fb7SAlan Stern if (ret) 92541e7e056SSarah Sharp return ret; 92641e7e056SSarah Sharp 92741e7e056SSarah Sharp /* Wait for the link to enter the disabled state. */ 92841e7e056SSarah Sharp for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 92941e7e056SSarah Sharp ret = hub_port_status(hub, port1, &portstatus, &portchange); 93041e7e056SSarah Sharp if (ret < 0) 93141e7e056SSarah Sharp return ret; 93241e7e056SSarah Sharp 93341e7e056SSarah Sharp if ((portstatus & USB_PORT_STAT_LINK_STATE) == 93441e7e056SSarah Sharp USB_SS_PORT_LS_SS_DISABLED) 93541e7e056SSarah Sharp break; 93641e7e056SSarah Sharp if (total_time >= HUB_DEBOUNCE_TIMEOUT) 93741e7e056SSarah Sharp break; 93841e7e056SSarah Sharp msleep(HUB_DEBOUNCE_STEP); 93941e7e056SSarah Sharp } 94041e7e056SSarah Sharp if (total_time >= HUB_DEBOUNCE_TIMEOUT) 941d99f6b41SDan Williams dev_warn(&hub->ports[port1 - 1]->dev, 942d99f6b41SDan Williams "Could not disable after %d ms\n", total_time); 94341e7e056SSarah Sharp 94441e7e056SSarah Sharp return hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_RX_DETECT); 94541e7e056SSarah Sharp } 94641e7e056SSarah Sharp 9478b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 9488b28c752SAlan Stern { 949d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 9508b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 9510458d5b4SAlan Stern int ret = 0; 9528b28c752SAlan Stern 953d99f6b41SDan Williams if (port_dev->child && set_state) 954d99f6b41SDan Williams usb_set_device_state(port_dev->child, USB_STATE_NOTATTACHED); 95541e7e056SSarah Sharp if (!hub->error) { 95641e7e056SSarah Sharp if (hub_is_superspeed(hub->hdev)) 95741e7e056SSarah Sharp ret = hub_usb3_port_disable(hub, port1); 95841e7e056SSarah Sharp else 959ad493e5eSLan Tianyu ret = usb_clear_port_feature(hdev, port1, 96041e7e056SSarah Sharp USB_PORT_FEAT_ENABLE); 96141e7e056SSarah Sharp } 962e9e88fb7SAlan Stern if (ret && ret != -ENODEV) 963d99f6b41SDan Williams dev_err(&port_dev->dev, "cannot disable (err = %d)\n", ret); 9648b28c752SAlan Stern return ret; 9658b28c752SAlan Stern } 9668b28c752SAlan Stern 9670458d5b4SAlan Stern /* 9686d42fcdbSJustin P. Mattock * Disable a port and mark a logical connect-change event, so that some 96937ebb549SPetr Mladek * time later hub_wq will disconnect() any existing usb_device on the port 9700458d5b4SAlan Stern * and will re-enumerate if there actually is a device attached. 9710458d5b4SAlan Stern */ 9720458d5b4SAlan Stern static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 9737d069b7dSAlan Stern { 974d99f6b41SDan Williams dev_dbg(&hub->ports[port1 - 1]->dev, "logical disconnect\n"); 9750458d5b4SAlan Stern hub_port_disable(hub, port1, 1); 9760458d5b4SAlan Stern 9770458d5b4SAlan Stern /* FIXME let caller ask to power down the port: 9780458d5b4SAlan Stern * - some devices won't enumerate without a VBUS power cycle 9790458d5b4SAlan Stern * - SRP saves power that way 9800458d5b4SAlan Stern * - ... new call, TBD ... 9810458d5b4SAlan Stern * That's easy if this hub can switch power per-port, and 98237ebb549SPetr Mladek * hub_wq reactivates the port later (timer, SRP, etc). 9830458d5b4SAlan Stern * Powerdown must be optional, because of reset/DFU. 9840458d5b4SAlan Stern */ 9850458d5b4SAlan Stern 9860458d5b4SAlan Stern set_bit(port1, hub->change_bits); 98732a69589SPetr Mladek kick_hub_wq(hub); 9880458d5b4SAlan Stern } 9890458d5b4SAlan Stern 990253e0572SAlan Stern /** 991253e0572SAlan Stern * usb_remove_device - disable a device's port on its parent hub 992253e0572SAlan Stern * @udev: device to be disabled and removed 993253e0572SAlan Stern * Context: @udev locked, must be able to sleep. 994253e0572SAlan Stern * 99537ebb549SPetr Mladek * After @udev's port has been disabled, hub_wq is notified and it will 996253e0572SAlan Stern * see that the device has been disconnected. When the device is 997253e0572SAlan Stern * physically unplugged and something is plugged in, the events will 998253e0572SAlan Stern * be received and processed normally. 999626f090cSYacine Belkadi * 1000626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 1001253e0572SAlan Stern */ 1002253e0572SAlan Stern int usb_remove_device(struct usb_device *udev) 1003253e0572SAlan Stern { 1004253e0572SAlan Stern struct usb_hub *hub; 1005253e0572SAlan Stern struct usb_interface *intf; 1006253e0572SAlan Stern 1007253e0572SAlan Stern if (!udev->parent) /* Can't remove a root hub */ 1008253e0572SAlan Stern return -EINVAL; 1009ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 1010253e0572SAlan Stern intf = to_usb_interface(hub->intfdev); 1011253e0572SAlan Stern 1012253e0572SAlan Stern usb_autopm_get_interface(intf); 1013253e0572SAlan Stern set_bit(udev->portnum, hub->removed_bits); 1014253e0572SAlan Stern hub_port_logical_disconnect(hub, udev->portnum); 1015253e0572SAlan Stern usb_autopm_put_interface(intf); 1016253e0572SAlan Stern return 0; 1017253e0572SAlan Stern } 1018253e0572SAlan Stern 10196ee0b270SAlan Stern enum hub_activation_type { 10208e4ceb38SAlan Stern HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ 10218520f380SAlan Stern HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, 10226ee0b270SAlan Stern }; 10235e6effaeSAlan Stern 10248520f380SAlan Stern static void hub_init_func2(struct work_struct *ws); 10258520f380SAlan Stern static void hub_init_func3(struct work_struct *ws); 10268520f380SAlan Stern 1027f2835219SAlan Stern static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) 10285e6effaeSAlan Stern { 10295e6effaeSAlan Stern struct usb_device *hdev = hub->hdev; 1030653a39d1SSarah Sharp struct usb_hcd *hcd; 1031653a39d1SSarah Sharp int ret; 10325e6effaeSAlan Stern int port1; 1033f2835219SAlan Stern int status; 1034948fea37SAlan Stern bool need_debounce_delay = false; 10358520f380SAlan Stern unsigned delay; 10368520f380SAlan Stern 10378520f380SAlan Stern /* Continue a partial initialization */ 10388520f380SAlan Stern if (type == HUB_INIT2) 10398520f380SAlan Stern goto init2; 10408520f380SAlan Stern if (type == HUB_INIT3) 10418520f380SAlan Stern goto init3; 10425e6effaeSAlan Stern 1043a45aa3b3SElric Fu /* The superspeed hub except for root hub has to use Hub Depth 1044a45aa3b3SElric Fu * value as an offset into the route string to locate the bits 1045a45aa3b3SElric Fu * it uses to determine the downstream port number. So hub driver 1046a45aa3b3SElric Fu * should send a set hub depth request to superspeed hub after 1047a45aa3b3SElric Fu * the superspeed hub is set configuration in initialization or 1048a45aa3b3SElric Fu * reset procedure. 1049a45aa3b3SElric Fu * 1050a45aa3b3SElric Fu * After a resume, port power should still be on. 1051f2835219SAlan Stern * For any other type of activation, turn it on. 1052f2835219SAlan Stern */ 10538520f380SAlan Stern if (type != HUB_RESUME) { 1054a45aa3b3SElric Fu if (hdev->parent && hub_is_superspeed(hdev)) { 1055a45aa3b3SElric Fu ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1056a45aa3b3SElric Fu HUB_SET_DEPTH, USB_RT_HUB, 1057a45aa3b3SElric Fu hdev->level - 1, 0, NULL, 0, 1058a45aa3b3SElric Fu USB_CTRL_SET_TIMEOUT); 1059a45aa3b3SElric Fu if (ret < 0) 1060a45aa3b3SElric Fu dev_err(hub->intfdev, 1061a45aa3b3SElric Fu "set hub depth failed\n"); 1062a45aa3b3SElric Fu } 10638520f380SAlan Stern 10648520f380SAlan Stern /* Speed up system boot by using a delayed_work for the 10658520f380SAlan Stern * hub's initial power-up delays. This is pretty awkward 10668520f380SAlan Stern * and the implementation looks like a home-brewed sort of 10678520f380SAlan Stern * setjmp/longjmp, but it saves at least 100 ms for each 10688520f380SAlan Stern * root hub (assuming usbcore is compiled into the kernel 10698520f380SAlan Stern * rather than as a module). It adds up. 10708520f380SAlan Stern * 10718520f380SAlan Stern * This can't be done for HUB_RESUME or HUB_RESET_RESUME 10728520f380SAlan Stern * because for those activation types the ports have to be 10738520f380SAlan Stern * operational when we return. In theory this could be done 10748520f380SAlan Stern * for HUB_POST_RESET, but it's easier not to. 10758520f380SAlan Stern */ 10768520f380SAlan Stern if (type == HUB_INIT) { 107717a364e2SKris Borer delay = hub_power_on_good_delay(hub); 10787ad3c470SDan Williams 10797ad3c470SDan Williams hub_power_on(hub, false); 108077fa83cfSTejun Heo INIT_DELAYED_WORK(&hub->init_work, hub_init_func2); 108122f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 108222f6a0f0SShaibal Dutta &hub->init_work, 10838520f380SAlan Stern msecs_to_jiffies(delay)); 108461fbeba1SAlan Stern 108561fbeba1SAlan Stern /* Suppress autosuspend until init is done */ 10868e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 10878e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 10888520f380SAlan Stern return; /* Continues at init2: below */ 1089653a39d1SSarah Sharp } else if (type == HUB_RESET_RESUME) { 1090653a39d1SSarah Sharp /* The internal host controller state for the hub device 1091653a39d1SSarah Sharp * may be gone after a host power loss on system resume. 1092653a39d1SSarah Sharp * Update the device's info so the HW knows it's a hub. 1093653a39d1SSarah Sharp */ 1094653a39d1SSarah Sharp hcd = bus_to_hcd(hdev->bus); 1095653a39d1SSarah Sharp if (hcd->driver->update_hub_device) { 1096653a39d1SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1097653a39d1SSarah Sharp &hub->tt, GFP_NOIO); 1098653a39d1SSarah Sharp if (ret < 0) { 1099653a39d1SSarah Sharp dev_err(hub->intfdev, "Host not " 1100653a39d1SSarah Sharp "accepting hub info " 1101653a39d1SSarah Sharp "update.\n"); 1102653a39d1SSarah Sharp dev_err(hub->intfdev, "LS/FS devices " 1103653a39d1SSarah Sharp "and hubs may not work " 1104653a39d1SSarah Sharp "under this hub\n."); 1105653a39d1SSarah Sharp } 1106653a39d1SSarah Sharp } 1107653a39d1SSarah Sharp hub_power_on(hub, true); 11088520f380SAlan Stern } else { 11098520f380SAlan Stern hub_power_on(hub, true); 11108520f380SAlan Stern } 11118520f380SAlan Stern } 11128520f380SAlan Stern init2: 1113f2835219SAlan Stern 1114d99f6b41SDan Williams /* 111537ebb549SPetr Mladek * Check each port and set hub->change_bits to let hub_wq know 11166ee0b270SAlan Stern * which ports need attention. 11175e6effaeSAlan Stern */ 11185e6effaeSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 1119d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 1120d99f6b41SDan Williams struct usb_device *udev = port_dev->child; 11215e6effaeSAlan Stern u16 portstatus, portchange; 11225e6effaeSAlan Stern 11236ee0b270SAlan Stern portstatus = portchange = 0; 11246ee0b270SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 11256ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 1126d99f6b41SDan Williams dev_dbg(&port_dev->dev, "status %04x change %04x\n", 1127d99f6b41SDan Williams portstatus, portchange); 11285e6effaeSAlan Stern 1129d99f6b41SDan Williams /* 1130d99f6b41SDan Williams * After anything other than HUB_RESUME (i.e., initialization 11316ee0b270SAlan Stern * or any sort of reset), every port should be disabled. 11326ee0b270SAlan Stern * Unconnected ports should likewise be disabled (paranoia), 11336ee0b270SAlan Stern * and so should ports for which we have no usb_device. 11345e6effaeSAlan Stern */ 11356ee0b270SAlan Stern if ((portstatus & USB_PORT_STAT_ENABLE) && ( 11366ee0b270SAlan Stern type != HUB_RESUME || 11376ee0b270SAlan Stern !(portstatus & USB_PORT_STAT_CONNECTION) || 11386ee0b270SAlan Stern !udev || 11396ee0b270SAlan Stern udev->state == USB_STATE_NOTATTACHED)) { 11409f0a6cd3SAndiry Xu /* 11419f0a6cd3SAndiry Xu * USB3 protocol ports will automatically transition 11429f0a6cd3SAndiry Xu * to Enabled state when detect an USB3.0 device attach. 1143fd1ac4cfSDan Williams * Do not disable USB3 protocol ports, just pretend 1144fd1ac4cfSDan Williams * power was lost 11459f0a6cd3SAndiry Xu */ 1146fd1ac4cfSDan Williams portstatus &= ~USB_PORT_STAT_ENABLE; 1147fd1ac4cfSDan Williams if (!hub_is_superspeed(hdev)) 1148ad493e5eSLan Tianyu usb_clear_port_feature(hdev, port1, 11499f0a6cd3SAndiry Xu USB_PORT_FEAT_ENABLE); 11509f0a6cd3SAndiry Xu } 11516ee0b270SAlan Stern 1152948fea37SAlan Stern /* Clear status-change flags; we'll debounce later */ 1153948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) { 1154948fea37SAlan Stern need_debounce_delay = true; 1155ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1156948fea37SAlan Stern USB_PORT_FEAT_C_CONNECTION); 1157948fea37SAlan Stern } 1158948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) { 1159948fea37SAlan Stern need_debounce_delay = true; 1160ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1161948fea37SAlan Stern USB_PORT_FEAT_C_ENABLE); 1162948fea37SAlan Stern } 1163e92aee33SJulius Werner if (portchange & USB_PORT_STAT_C_RESET) { 1164e92aee33SJulius Werner need_debounce_delay = true; 1165e92aee33SJulius Werner usb_clear_port_feature(hub->hdev, port1, 1166e92aee33SJulius Werner USB_PORT_FEAT_C_RESET); 1167e92aee33SJulius Werner } 116879c3dd81SDon Zickus if ((portchange & USB_PORT_STAT_C_BH_RESET) && 116979c3dd81SDon Zickus hub_is_superspeed(hub->hdev)) { 117079c3dd81SDon Zickus need_debounce_delay = true; 1171ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 117279c3dd81SDon Zickus USB_PORT_FEAT_C_BH_PORT_RESET); 117379c3dd81SDon Zickus } 1174253e0572SAlan Stern /* We can forget about a "removed" device when there's a 1175253e0572SAlan Stern * physical disconnect or the connect status changes. 1176253e0572SAlan Stern */ 1177253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 1178253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 1179253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 1180253e0572SAlan Stern 11816ee0b270SAlan Stern if (!udev || udev->state == USB_STATE_NOTATTACHED) { 118237ebb549SPetr Mladek /* Tell hub_wq to disconnect the device or 11836ee0b270SAlan Stern * check for a new connection 11846ee0b270SAlan Stern */ 118508d1dec6SShen Guang if (udev || (portstatus & USB_PORT_STAT_CONNECTION) || 118608d1dec6SShen Guang (portstatus & USB_PORT_STAT_OVERCURRENT)) 11876ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11886ee0b270SAlan Stern 11896ee0b270SAlan Stern } else if (portstatus & USB_PORT_STAT_ENABLE) { 119072937e1eSSarah Sharp bool port_resumed = (portstatus & 119172937e1eSSarah Sharp USB_PORT_STAT_LINK_STATE) == 119272937e1eSSarah Sharp USB_SS_PORT_LS_U0; 11936ee0b270SAlan Stern /* The power session apparently survived the resume. 11946ee0b270SAlan Stern * If there was an overcurrent or suspend change 119537ebb549SPetr Mladek * (i.e., remote wakeup request), have hub_wq 119672937e1eSSarah Sharp * take care of it. Look at the port link state 119772937e1eSSarah Sharp * for USB 3.0 hubs, since they don't have a suspend 119872937e1eSSarah Sharp * change bit, and they don't set the port link change 119972937e1eSSarah Sharp * bit on device-initiated resume. 12006ee0b270SAlan Stern */ 120172937e1eSSarah Sharp if (portchange || (hub_is_superspeed(hub->hdev) && 120272937e1eSSarah Sharp port_resumed)) 12036ee0b270SAlan Stern set_bit(port1, hub->change_bits); 12046ee0b270SAlan Stern 12056ee0b270SAlan Stern } else if (udev->persist_enabled) { 12066ee0b270SAlan Stern #ifdef CONFIG_PM 12075e6effaeSAlan Stern udev->reset_resume = 1; 12086ee0b270SAlan Stern #endif 1209ad493e5eSLan Tianyu /* Don't set the change_bits when the device 1210ad493e5eSLan Tianyu * was powered off. 1211ad493e5eSLan Tianyu */ 1212d5c3834eSDan Williams if (test_bit(port1, hub->power_bits)) 12138808f00cSAlan Stern set_bit(port1, hub->change_bits); 12148808f00cSAlan Stern 12156ee0b270SAlan Stern } else { 121637ebb549SPetr Mladek /* The power session is gone; tell hub_wq */ 12176ee0b270SAlan Stern usb_set_device_state(udev, USB_STATE_NOTATTACHED); 12186ee0b270SAlan Stern set_bit(port1, hub->change_bits); 12195e6effaeSAlan Stern } 12205e6effaeSAlan Stern } 12215e6effaeSAlan Stern 1222948fea37SAlan Stern /* If no port-status-change flags were set, we don't need any 1223948fea37SAlan Stern * debouncing. If flags were set we can try to debounce the 122437ebb549SPetr Mladek * ports all at once right now, instead of letting hub_wq do them 1225948fea37SAlan Stern * one at a time later on. 1226948fea37SAlan Stern * 122737ebb549SPetr Mladek * If any port-status changes do occur during this delay, hub_wq 1228948fea37SAlan Stern * will see them later and handle them normally. 1229948fea37SAlan Stern */ 12308520f380SAlan Stern if (need_debounce_delay) { 12318520f380SAlan Stern delay = HUB_DEBOUNCE_STABLE; 1232f2835219SAlan Stern 12338520f380SAlan Stern /* Don't do a long sleep inside a workqueue routine */ 12348520f380SAlan Stern if (type == HUB_INIT2) { 123577fa83cfSTejun Heo INIT_DELAYED_WORK(&hub->init_work, hub_init_func3); 123622f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 123722f6a0f0SShaibal Dutta &hub->init_work, 12388520f380SAlan Stern msecs_to_jiffies(delay)); 12398520f380SAlan Stern return; /* Continues at init3: below */ 12408520f380SAlan Stern } else { 12418520f380SAlan Stern msleep(delay); 12428520f380SAlan Stern } 12438520f380SAlan Stern } 12448520f380SAlan Stern init3: 1245f2835219SAlan Stern hub->quiescing = 0; 1246f2835219SAlan Stern 1247f2835219SAlan Stern status = usb_submit_urb(hub->urb, GFP_NOIO); 1248f2835219SAlan Stern if (status < 0) 1249f2835219SAlan Stern dev_err(hub->intfdev, "activate --> %d\n", status); 1250f2835219SAlan Stern if (hub->has_indicators && blinkenlights) 125122f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 125222f6a0f0SShaibal Dutta &hub->leds, LED_CYCLE_PERIOD); 1253f2835219SAlan Stern 1254f2835219SAlan Stern /* Scan all ports that need attention */ 125532a69589SPetr Mladek kick_hub_wq(hub); 12568e4ceb38SAlan Stern 12578e4ceb38SAlan Stern /* Allow autosuspend if it was suppressed */ 12588e4ceb38SAlan Stern if (type <= HUB_INIT3) 12598e4ceb38SAlan Stern usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); 12605e6effaeSAlan Stern } 12615e6effaeSAlan Stern 12628520f380SAlan Stern /* Implement the continuations for the delays above */ 12638520f380SAlan Stern static void hub_init_func2(struct work_struct *ws) 12648520f380SAlan Stern { 12658520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 12668520f380SAlan Stern 12678520f380SAlan Stern hub_activate(hub, HUB_INIT2); 12688520f380SAlan Stern } 12698520f380SAlan Stern 12708520f380SAlan Stern static void hub_init_func3(struct work_struct *ws) 12718520f380SAlan Stern { 12728520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 12738520f380SAlan Stern 12748520f380SAlan Stern hub_activate(hub, HUB_INIT3); 12758520f380SAlan Stern } 12768520f380SAlan Stern 12774330354fSAlan Stern enum hub_quiescing_type { 12784330354fSAlan Stern HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND 12794330354fSAlan Stern }; 12804330354fSAlan Stern 12814330354fSAlan Stern static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) 12824330354fSAlan Stern { 12834330354fSAlan Stern struct usb_device *hdev = hub->hdev; 12844330354fSAlan Stern int i; 12854330354fSAlan Stern 12868520f380SAlan Stern cancel_delayed_work_sync(&hub->init_work); 12878520f380SAlan Stern 128837ebb549SPetr Mladek /* hub_wq and related activity won't re-trigger */ 12894330354fSAlan Stern hub->quiescing = 1; 12904330354fSAlan Stern 12914330354fSAlan Stern if (type != HUB_SUSPEND) { 12924330354fSAlan Stern /* Disconnect all the children */ 12934330354fSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 1294ff823c79SLan Tianyu if (hub->ports[i]->child) 1295ff823c79SLan Tianyu usb_disconnect(&hub->ports[i]->child); 12964330354fSAlan Stern } 12974330354fSAlan Stern } 12984330354fSAlan Stern 129937ebb549SPetr Mladek /* Stop hub_wq and related activity */ 13004330354fSAlan Stern usb_kill_urb(hub->urb); 13014330354fSAlan Stern if (hub->has_indicators) 13024330354fSAlan Stern cancel_delayed_work_sync(&hub->leds); 13034330354fSAlan Stern if (hub->tt.hub) 1304036546bfSOctavian Purdila flush_work(&hub->tt.clear_work); 13054330354fSAlan Stern } 13064330354fSAlan Stern 1307600856c2SAlan Stern static void hub_pm_barrier_for_all_ports(struct usb_hub *hub) 1308600856c2SAlan Stern { 1309600856c2SAlan Stern int i; 1310600856c2SAlan Stern 1311600856c2SAlan Stern for (i = 0; i < hub->hdev->maxchild; ++i) 1312600856c2SAlan Stern pm_runtime_barrier(&hub->ports[i]->dev); 1313600856c2SAlan Stern } 1314600856c2SAlan Stern 13153eb14915SAlan Stern /* caller has locked the hub device */ 13163eb14915SAlan Stern static int hub_pre_reset(struct usb_interface *intf) 13173eb14915SAlan Stern { 13183eb14915SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 13193eb14915SAlan Stern 13204330354fSAlan Stern hub_quiesce(hub, HUB_PRE_RESET); 1321600856c2SAlan Stern hub->in_reset = 1; 1322600856c2SAlan Stern hub_pm_barrier_for_all_ports(hub); 1323f07600cfSAlan Stern return 0; 13247d069b7dSAlan Stern } 13257d069b7dSAlan Stern 13267d069b7dSAlan Stern /* caller has locked the hub device */ 1327f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 13287d069b7dSAlan Stern { 13297de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 13307de18d8bSAlan Stern 1331600856c2SAlan Stern hub->in_reset = 0; 1332600856c2SAlan Stern hub_pm_barrier_for_all_ports(hub); 1333f2835219SAlan Stern hub_activate(hub, HUB_POST_RESET); 1334f07600cfSAlan Stern return 0; 13357d069b7dSAlan Stern } 13367d069b7dSAlan Stern 13371da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 13381da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 13391da177e4SLinus Torvalds { 1340b356b7c7SSarah Sharp struct usb_hcd *hcd; 13411da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 13421da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 13431da177e4SLinus Torvalds u16 hubstatus, hubchange; 134474ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 13451da177e4SLinus Torvalds unsigned int pipe; 1346fa2a9566SLan Tianyu int maxp, ret, i; 13477cbe5dcaSAlan Stern char *message = "out of memory"; 1348430ee58eSSebastian Andrzej Siewior unsigned unit_load; 1349430ee58eSSebastian Andrzej Siewior unsigned full_load; 1350d8521afeSDan Williams unsigned maxchild; 13511da177e4SLinus Torvalds 1352d697cddaSAlan Stern hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); 13531da177e4SLinus Torvalds if (!hub->buffer) { 13541da177e4SLinus Torvalds ret = -ENOMEM; 13551da177e4SLinus Torvalds goto fail; 13561da177e4SLinus Torvalds } 13571da177e4SLinus Torvalds 13581da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 13591da177e4SLinus Torvalds if (!hub->status) { 13601da177e4SLinus Torvalds ret = -ENOMEM; 13611da177e4SLinus Torvalds goto fail; 13621da177e4SLinus Torvalds } 1363db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 13641da177e4SLinus Torvalds 13651da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 13661da177e4SLinus Torvalds if (!hub->descriptor) { 13671da177e4SLinus Torvalds ret = -ENOMEM; 13681da177e4SLinus Torvalds goto fail; 13691da177e4SLinus Torvalds } 13701da177e4SLinus Torvalds 13711da177e4SLinus Torvalds /* Request the entire hub descriptor. 13721da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 13731da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 13741da177e4SLinus Torvalds */ 1375dbe79bbeSJohn Youn ret = get_hub_descriptor(hdev, hub->descriptor); 13761da177e4SLinus Torvalds if (ret < 0) { 13771da177e4SLinus Torvalds message = "can't read hub descriptor"; 13781da177e4SLinus Torvalds goto fail; 13791da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 13801da177e4SLinus Torvalds message = "hub has too many ports!"; 13811da177e4SLinus Torvalds ret = -ENODEV; 13821da177e4SLinus Torvalds goto fail; 1383769d7368SDavid Linares } else if (hub->descriptor->bNbrPorts == 0) { 1384769d7368SDavid Linares message = "hub doesn't have any ports!"; 1385769d7368SDavid Linares ret = -ENODEV; 1386769d7368SDavid Linares goto fail; 13871da177e4SLinus Torvalds } 13881da177e4SLinus Torvalds 1389d8521afeSDan Williams maxchild = hub->descriptor->bNbrPorts; 1390d8521afeSDan Williams dev_info(hub_dev, "%d port%s detected\n", maxchild, 1391d8521afeSDan Williams (maxchild == 1) ? "" : "s"); 13921da177e4SLinus Torvalds 1393d8521afeSDan Williams hub->ports = kzalloc(maxchild * sizeof(struct usb_port *), GFP_KERNEL); 1394ff823c79SLan Tianyu if (!hub->ports) { 13957cbe5dcaSAlan Stern ret = -ENOMEM; 13967cbe5dcaSAlan Stern goto fail; 13977cbe5dcaSAlan Stern } 13987cbe5dcaSAlan Stern 139974ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 1400430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hdev)) { 1401430ee58eSSebastian Andrzej Siewior unit_load = 150; 1402430ee58eSSebastian Andrzej Siewior full_load = 900; 1403430ee58eSSebastian Andrzej Siewior } else { 1404430ee58eSSebastian Andrzej Siewior unit_load = 100; 1405430ee58eSSebastian Andrzej Siewior full_load = 500; 1406430ee58eSSebastian Andrzej Siewior } 14071da177e4SLinus Torvalds 1408dbe79bbeSJohn Youn /* FIXME for USB 3.0, skip for now */ 1409dbe79bbeSJohn Youn if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && 1410dbe79bbeSJohn Youn !(hub_is_superspeed(hdev))) { 14111da177e4SLinus Torvalds char portstr[USB_MAXCHILDREN + 1]; 14121da177e4SLinus Torvalds 1413d8521afeSDan Williams for (i = 0; i < maxchild; i++) 1414dbe79bbeSJohn Youn portstr[i] = hub->descriptor->u.hs.DeviceRemovable 14151da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 14161da177e4SLinus Torvalds ? 'F' : 'R'; 1417d8521afeSDan Williams portstr[maxchild] = 0; 14181da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 14191da177e4SLinus Torvalds } else 14201da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 14211da177e4SLinus Torvalds 142274ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 14237bf01185SAman Deep case HUB_CHAR_COMMON_LPSM: 14241da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 14251da177e4SLinus Torvalds break; 14267bf01185SAman Deep case HUB_CHAR_INDV_PORT_LPSM: 14271da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 14281da177e4SLinus Torvalds break; 14297bf01185SAman Deep case HUB_CHAR_NO_LPSM: 14307bf01185SAman Deep case HUB_CHAR_LPSM: 14311da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 14321da177e4SLinus Torvalds break; 14331da177e4SLinus Torvalds } 14341da177e4SLinus Torvalds 143574ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 14367bf01185SAman Deep case HUB_CHAR_COMMON_OCPM: 14371da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 14381da177e4SLinus Torvalds break; 14397bf01185SAman Deep case HUB_CHAR_INDV_PORT_OCPM: 14401da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 14411da177e4SLinus Torvalds break; 14427bf01185SAman Deep case HUB_CHAR_NO_OCPM: 14437bf01185SAman Deep case HUB_CHAR_OCPM: 14441da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 14451da177e4SLinus Torvalds break; 14461da177e4SLinus Torvalds } 14471da177e4SLinus Torvalds 14481da177e4SLinus Torvalds spin_lock_init(&hub->tt.lock); 14491da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->tt.clear_list); 1450cb88a1b8SAlan Stern INIT_WORK(&hub->tt.clear_work, hub_tt_work); 14511da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 14527bf01185SAman Deep case USB_HUB_PR_FS: 14531da177e4SLinus Torvalds break; 14547bf01185SAman Deep case USB_HUB_PR_HS_SINGLE_TT: 14551da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 14561da177e4SLinus Torvalds hub->tt.hub = hdev; 14571da177e4SLinus Torvalds break; 14587bf01185SAman Deep case USB_HUB_PR_HS_MULTI_TT: 14591da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 14601da177e4SLinus Torvalds if (ret == 0) { 14611da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 14621da177e4SLinus Torvalds hub->tt.multi = 1; 14631da177e4SLinus Torvalds } else 14641da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 14651da177e4SLinus Torvalds ret); 14661da177e4SLinus Torvalds hub->tt.hub = hdev; 14671da177e4SLinus Torvalds break; 14687bf01185SAman Deep case USB_HUB_PR_SS: 1469d2e9b4d6SSarah Sharp /* USB 3.0 hubs don't have a TT */ 1470d2e9b4d6SSarah Sharp break; 14711da177e4SLinus Torvalds default: 14721da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 14731da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 14741da177e4SLinus Torvalds break; 14751da177e4SLinus Torvalds } 14761da177e4SLinus Torvalds 1477e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 147874ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 1479e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 1480e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 1481e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 1482e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1483e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1484e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 1485e09711aeSdavid-b@pacbell.net } 14861da177e4SLinus Torvalds break; 1487e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 1488e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 1489e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1490e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1491e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 14921da177e4SLinus Torvalds break; 1493e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 1494e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 1495e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1496e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1497e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 14981da177e4SLinus Torvalds break; 1499e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 1500e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 1501e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1502e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1503e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 15041da177e4SLinus Torvalds break; 15051da177e4SLinus Torvalds } 15061da177e4SLinus Torvalds 15071da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 150874ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 15091da177e4SLinus Torvalds hub->has_indicators = 1; 15101da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 15111da177e4SLinus Torvalds } 15121da177e4SLinus Torvalds 15131da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 15141da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 15151da177e4SLinus Torvalds 15161da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 15171da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 15181da177e4SLinus Torvalds */ 15191da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 152015b7336eSAlan Stern if (ret) { 15211da177e4SLinus Torvalds message = "can't get hub status"; 15221da177e4SLinus Torvalds goto fail; 15231da177e4SLinus Torvalds } 1524430ee58eSSebastian Andrzej Siewior hcd = bus_to_hcd(hdev->bus); 15257d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 1526430ee58eSSebastian Andrzej Siewior if (hcd->power_budget > 0) 1527430ee58eSSebastian Andrzej Siewior hdev->bus_mA = hcd->power_budget; 1528430ee58eSSebastian Andrzej Siewior else 1529d8521afeSDan Williams hdev->bus_mA = full_load * maxchild; 1530430ee58eSSebastian Andrzej Siewior if (hdev->bus_mA >= full_load) 1531430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 153255c52718SAlan Stern else { 153355c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 153455c52718SAlan Stern hub->limited_power = 1; 153555c52718SAlan Stern } 15367d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 153755c52718SAlan Stern int remaining = hdev->bus_mA - 153855c52718SAlan Stern hub->descriptor->bHubContrCurrent; 15391da177e4SLinus Torvalds 1540430ee58eSSebastian Andrzej Siewior dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 1541430ee58eSSebastian Andrzej Siewior hub->descriptor->bHubContrCurrent); 1542430ee58eSSebastian Andrzej Siewior hub->limited_power = 1; 1543430ee58eSSebastian Andrzej Siewior 1544d8521afeSDan Williams if (remaining < maxchild * unit_load) 154555c52718SAlan Stern dev_warn(hub_dev, 154655c52718SAlan Stern "insufficient power available " 154755c52718SAlan Stern "to use all downstream ports\n"); 1548430ee58eSSebastian Andrzej Siewior hub->mA_per_port = unit_load; /* 7.2.1 */ 1549430ee58eSSebastian Andrzej Siewior 155055c52718SAlan Stern } else { /* Self-powered external hub */ 155155c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 155255c52718SAlan Stern * provide less current per port? */ 1553430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 155455c52718SAlan Stern } 1555430ee58eSSebastian Andrzej Siewior if (hub->mA_per_port < full_load) 155655c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 155755c52718SAlan Stern hub->mA_per_port); 15581da177e4SLinus Torvalds 15591da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 15601da177e4SLinus Torvalds if (ret < 0) { 15611da177e4SLinus Torvalds message = "can't get hub status"; 15621da177e4SLinus Torvalds goto fail; 15631da177e4SLinus Torvalds } 15641da177e4SLinus Torvalds 15651da177e4SLinus Torvalds /* local power status reports aren't always correct */ 15661da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 15671da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 15681da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 15691da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 15701da177e4SLinus Torvalds 157174ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 15721da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 15731da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 15741da177e4SLinus Torvalds 157588fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 157688fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 157788fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 157888fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 157988fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 158088fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 15811da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 15821da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 15831da177e4SLinus Torvalds 15841da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 15851da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 15861da177e4SLinus Torvalds 15871da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 15881da177e4SLinus Torvalds if (!hub->urb) { 15891da177e4SLinus Torvalds ret = -ENOMEM; 15901da177e4SLinus Torvalds goto fail; 15911da177e4SLinus Torvalds } 15921da177e4SLinus Torvalds 15931da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 15941da177e4SLinus Torvalds hub, endpoint->bInterval); 15951da177e4SLinus Torvalds 15961da177e4SLinus Torvalds /* maybe cycle the hub leds */ 15971da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 15981da177e4SLinus Torvalds hub->indicator[0] = INDICATOR_CYCLE; 15991da177e4SLinus Torvalds 1600d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 1601d8521afeSDan Williams for (i = 0; i < maxchild; i++) { 1602e58547ebSKrzysztof Mazur ret = usb_hub_create_port_device(hub, i + 1); 1603e58547ebSKrzysztof Mazur if (ret < 0) { 1604fa2a9566SLan Tianyu dev_err(hub->intfdev, 1605fa2a9566SLan Tianyu "couldn't create port%d device.\n", i + 1); 1606d8521afeSDan Williams break; 1607d8521afeSDan Williams } 1608d8521afeSDan Williams } 1609e58547ebSKrzysztof Mazur hdev->maxchild = i; 1610e3d10505SDan Williams for (i = 0; i < hdev->maxchild; i++) { 1611e3d10505SDan Williams struct usb_port *port_dev = hub->ports[i]; 1612e3d10505SDan Williams 1613e3d10505SDan Williams pm_runtime_put(&port_dev->dev); 1614e3d10505SDan Williams } 1615e3d10505SDan Williams 1616d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 1617d8521afeSDan Williams if (ret < 0) 1618d8521afeSDan Williams goto fail; 1619fa2a9566SLan Tianyu 162037ebb549SPetr Mladek /* Update the HCD's internal representation of this hub before hub_wq 1621e3d95580SDan Williams * starts getting port status changes for devices under the hub. 1622e3d95580SDan Williams */ 1623e3d95580SDan Williams if (hcd->driver->update_hub_device) { 1624e3d95580SDan Williams ret = hcd->driver->update_hub_device(hcd, hdev, 1625e3d95580SDan Williams &hub->tt, GFP_KERNEL); 1626e3d95580SDan Williams if (ret < 0) { 1627e3d95580SDan Williams message = "can't update HCD hub info"; 1628e3d95580SDan Williams goto fail; 1629e3d95580SDan Williams } 1630e3d95580SDan Williams } 1631e3d95580SDan Williams 1632d2123fd9SLan Tianyu usb_hub_adjust_deviceremovable(hdev, hub->descriptor); 1633d2123fd9SLan Tianyu 1634f2835219SAlan Stern hub_activate(hub, HUB_INIT); 16351da177e4SLinus Torvalds return 0; 16361da177e4SLinus Torvalds 16371da177e4SLinus Torvalds fail: 16381da177e4SLinus Torvalds dev_err(hub_dev, "config failed, %s (err %d)\n", 16391da177e4SLinus Torvalds message, ret); 16401da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 16411da177e4SLinus Torvalds return ret; 16421da177e4SLinus Torvalds } 16431da177e4SLinus Torvalds 1644e8054854SAlan Stern static void hub_release(struct kref *kref) 1645e8054854SAlan Stern { 1646e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 1647e8054854SAlan Stern 16485d14f323SPetr Mladek usb_put_dev(hub->hdev); 1649e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 1650e8054854SAlan Stern kfree(hub); 1651e8054854SAlan Stern } 1652e8054854SAlan Stern 16531da177e4SLinus Torvalds static unsigned highspeed_hubs; 16541da177e4SLinus Torvalds 16551da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 16561da177e4SLinus Torvalds { 16571da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 1658fa286188SGreg Kroah-Hartman struct usb_device *hdev = interface_to_usbdev(intf); 1659543d7784SAlan Stern int port1; 1660fa2a9566SLan Tianyu 166132a69589SPetr Mladek /* 166232a69589SPetr Mladek * Stop adding new hub events. We do not want to block here and thus 166332a69589SPetr Mladek * will not try to remove any pending work item. 166432a69589SPetr Mladek */ 1665e8054854SAlan Stern hub->disconnected = 1; 16661da177e4SLinus Torvalds 16677de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 16687de18d8bSAlan Stern hub->error = 0; 16694330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 16707de18d8bSAlan Stern 1671d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 1672d8521afeSDan Williams 1673543d7784SAlan Stern /* Avoid races with recursively_mark_NOTATTACHED() */ 1674543d7784SAlan Stern spin_lock_irq(&device_state_lock); 1675543d7784SAlan Stern port1 = hdev->maxchild; 1676543d7784SAlan Stern hdev->maxchild = 0; 16778b28c752SAlan Stern usb_set_intfdata(intf, NULL); 1678543d7784SAlan Stern spin_unlock_irq(&device_state_lock); 16791f2235b8SAlexander Shishkin 1680543d7784SAlan Stern for (; port1 > 0; --port1) 1681543d7784SAlan Stern usb_hub_remove_port_device(hub, port1); 16821da177e4SLinus Torvalds 1683d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 1684d8521afeSDan Williams 1685e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 16861da177e4SLinus Torvalds highspeed_hubs--; 16871da177e4SLinus Torvalds 16881da177e4SLinus Torvalds usb_free_urb(hub->urb); 1689fa2a9566SLan Tianyu kfree(hub->ports); 16901da177e4SLinus Torvalds kfree(hub->descriptor); 16911da177e4SLinus Torvalds kfree(hub->status); 1692d697cddaSAlan Stern kfree(hub->buffer); 16931da177e4SLinus Torvalds 1694971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, false); 1695e8054854SAlan Stern kref_put(&hub->kref, hub_release); 16961da177e4SLinus Torvalds } 16971da177e4SLinus Torvalds 16981da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 16991da177e4SLinus Torvalds { 17001da177e4SLinus Torvalds struct usb_host_interface *desc; 17011da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 17021da177e4SLinus Torvalds struct usb_device *hdev; 17031da177e4SLinus Torvalds struct usb_hub *hub; 17041da177e4SLinus Torvalds 17051da177e4SLinus Torvalds desc = intf->cur_altsetting; 17061da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 17071da177e4SLinus Torvalds 1708596d789aSMing Lei /* 1709596d789aSMing Lei * Set default autosuspend delay as 0 to speedup bus suspend, 1710596d789aSMing Lei * based on the below considerations: 1711596d789aSMing Lei * 1712596d789aSMing Lei * - Unlike other drivers, the hub driver does not rely on the 1713596d789aSMing Lei * autosuspend delay to provide enough time to handle a wakeup 1714596d789aSMing Lei * event, and the submitted status URB is just to check future 1715596d789aSMing Lei * change on hub downstream ports, so it is safe to do it. 1716596d789aSMing Lei * 1717596d789aSMing Lei * - The patch might cause one or more auto supend/resume for 1718596d789aSMing Lei * below very rare devices when they are plugged into hub 1719596d789aSMing Lei * first time: 1720596d789aSMing Lei * 1721596d789aSMing Lei * devices having trouble initializing, and disconnect 1722596d789aSMing Lei * themselves from the bus and then reconnect a second 1723596d789aSMing Lei * or so later 1724596d789aSMing Lei * 1725596d789aSMing Lei * devices just for downloading firmware, and disconnects 1726596d789aSMing Lei * themselves after completing it 1727596d789aSMing Lei * 1728596d789aSMing Lei * For these quite rare devices, their drivers may change the 1729596d789aSMing Lei * autosuspend delay of their parent hub in the probe() to one 1730596d789aSMing Lei * appropriate value to avoid the subtle problem if someone 1731596d789aSMing Lei * does care it. 1732596d789aSMing Lei * 1733596d789aSMing Lei * - The patch may cause one or more auto suspend/resume on 1734596d789aSMing Lei * hub during running 'lsusb', but it is probably too 1735596d789aSMing Lei * infrequent to worry about. 1736596d789aSMing Lei * 1737596d789aSMing Lei * - Change autosuspend delay of hub can avoid unnecessary auto 1738596d789aSMing Lei * suspend timer for hub, also may decrease power consumption 1739596d789aSMing Lei * of USB bus. 1740bdd405d2SRoger Quadros * 1741bdd405d2SRoger Quadros * - If user has indicated to prevent autosuspend by passing 1742bdd405d2SRoger Quadros * usbcore.autosuspend = -1 then keep autosuspend disabled. 1743596d789aSMing Lei */ 1744ceb6c9c8SRafael J. Wysocki #ifdef CONFIG_PM 1745bdd405d2SRoger Quadros if (hdev->dev.power.autosuspend_delay >= 0) 1746596d789aSMing Lei pm_runtime_set_autosuspend_delay(&hdev->dev, 0); 1747a9ef803dSGreg Kroah-Hartman #endif 1748596d789aSMing Lei 17498ef42dddSAlan Stern /* 17508ef42dddSAlan Stern * Hubs have proper suspend/resume support, except for root hubs 17518ef42dddSAlan Stern * where the controller driver doesn't have bus_suspend and 17528ef42dddSAlan Stern * bus_resume methods. 17538ef42dddSAlan Stern */ 17548ef42dddSAlan Stern if (hdev->parent) { /* normal device */ 1755088f7fecSAlan Stern usb_enable_autosuspend(hdev); 17568ef42dddSAlan Stern } else { /* root hub */ 17578ef42dddSAlan Stern const struct hc_driver *drv = bus_to_hcd(hdev->bus)->driver; 17588ef42dddSAlan Stern 17598ef42dddSAlan Stern if (drv->bus_suspend && drv->bus_resume) 17608ef42dddSAlan Stern usb_enable_autosuspend(hdev); 17618ef42dddSAlan Stern } 1762088f7fecSAlan Stern 176338f3ad5eSFelipe Balbi if (hdev->level == MAX_TOPO_LEVEL) { 1764b9cef6c3SWu Fengguang dev_err(&intf->dev, 1765b9cef6c3SWu Fengguang "Unsupported bus topology: hub nested too deep\n"); 176638f3ad5eSFelipe Balbi return -E2BIG; 176738f3ad5eSFelipe Balbi } 176838f3ad5eSFelipe Balbi 176989ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 177089ccbdc9SDavid Brownell if (hdev->parent) { 177189ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 177289ccbdc9SDavid Brownell return -ENODEV; 177389ccbdc9SDavid Brownell } 177489ccbdc9SDavid Brownell #endif 177589ccbdc9SDavid Brownell 17761da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 17771da177e4SLinus Torvalds /* specs is not defined, but it works */ 17781da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 17791da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 17801da177e4SLinus Torvalds descriptor_error: 17811da177e4SLinus Torvalds dev_err(&intf->dev, "bad descriptor, ignoring hub\n"); 17821da177e4SLinus Torvalds return -EIO; 17831da177e4SLinus Torvalds } 17841da177e4SLinus Torvalds 17851da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 17861da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 17871da177e4SLinus Torvalds goto descriptor_error; 17881da177e4SLinus Torvalds 17891da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 17901da177e4SLinus Torvalds 1791fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 1792fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 17931da177e4SLinus Torvalds goto descriptor_error; 17941da177e4SLinus Torvalds 17951da177e4SLinus Torvalds /* We found a hub */ 17961da177e4SLinus Torvalds dev_info(&intf->dev, "USB hub found\n"); 17971da177e4SLinus Torvalds 17980a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 17991da177e4SLinus Torvalds if (!hub) { 18001da177e4SLinus Torvalds dev_dbg(&intf->dev, "couldn't kmalloc hub struct\n"); 18011da177e4SLinus Torvalds return -ENOMEM; 18021da177e4SLinus Torvalds } 18031da177e4SLinus Torvalds 1804e8054854SAlan Stern kref_init(&hub->kref); 18051da177e4SLinus Torvalds hub->intfdev = &intf->dev; 18061da177e4SLinus Torvalds hub->hdev = hdev; 1807c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 18088520f380SAlan Stern INIT_DELAYED_WORK(&hub->init_work, NULL); 180932a69589SPetr Mladek INIT_WORK(&hub->events, hub_event); 1810e8054854SAlan Stern usb_get_intf(intf); 18115d14f323SPetr Mladek usb_get_dev(hdev); 18121da177e4SLinus Torvalds 18131da177e4SLinus Torvalds usb_set_intfdata(intf, hub); 181440f122f3SAlan Stern intf->needs_remote_wakeup = 1; 1815971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, true); 18161da177e4SLinus Torvalds 18171da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 18181da177e4SLinus Torvalds highspeed_hubs++; 18191da177e4SLinus Torvalds 1820e6f30deaSMing Lei if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) 1821e6f30deaSMing Lei hub->quirk_check_port_auto_suspend = 1; 1822e6f30deaSMing Lei 18231da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 18241da177e4SLinus Torvalds return 0; 18251da177e4SLinus Torvalds 18261da177e4SLinus Torvalds hub_disconnect(intf); 18271da177e4SLinus Torvalds return -ENODEV; 18281da177e4SLinus Torvalds } 18291da177e4SLinus Torvalds 18301da177e4SLinus Torvalds static int 18311da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 18321da177e4SLinus Torvalds { 18331da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev(intf); 1834ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 18351da177e4SLinus Torvalds 18361da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 18371da177e4SLinus Torvalds switch (code) { 18381da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 18391da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 18401da177e4SLinus Torvalds int i; 18411da177e4SLinus Torvalds 18421da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 18431da177e4SLinus Torvalds if (hdev->devnum <= 0) 18441da177e4SLinus Torvalds info->nports = 0; 18451da177e4SLinus Torvalds else { 18461da177e4SLinus Torvalds info->nports = hdev->maxchild; 18471da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 1848ff823c79SLan Tianyu if (hub->ports[i]->child == NULL) 18491da177e4SLinus Torvalds info->port[i] = 0; 18501da177e4SLinus Torvalds else 18511da177e4SLinus Torvalds info->port[i] = 1852ff823c79SLan Tianyu hub->ports[i]->child->devnum; 18531da177e4SLinus Torvalds } 18541da177e4SLinus Torvalds } 18551da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 18561da177e4SLinus Torvalds 18571da177e4SLinus Torvalds return info->nports + 1; 18581da177e4SLinus Torvalds } 18591da177e4SLinus Torvalds 18601da177e4SLinus Torvalds default: 18611da177e4SLinus Torvalds return -ENOSYS; 18621da177e4SLinus Torvalds } 18631da177e4SLinus Torvalds } 18641da177e4SLinus Torvalds 18657cbe5dcaSAlan Stern /* 18667cbe5dcaSAlan Stern * Allow user programs to claim ports on a hub. When a device is attached 18677cbe5dcaSAlan Stern * to one of these "claimed" ports, the program will "own" the device. 18687cbe5dcaSAlan Stern */ 18697cbe5dcaSAlan Stern static int find_port_owner(struct usb_device *hdev, unsigned port1, 18709b6f0c4bSValentina Manea struct usb_dev_state ***ppowner) 18717cbe5dcaSAlan Stern { 187241341261SMathias Nyman struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 187341341261SMathias Nyman 18747cbe5dcaSAlan Stern if (hdev->state == USB_STATE_NOTATTACHED) 18757cbe5dcaSAlan Stern return -ENODEV; 18767cbe5dcaSAlan Stern if (port1 == 0 || port1 > hdev->maxchild) 18777cbe5dcaSAlan Stern return -EINVAL; 18787cbe5dcaSAlan Stern 187941341261SMathias Nyman /* Devices not managed by the hub driver 18807cbe5dcaSAlan Stern * will always have maxchild equal to 0. 18817cbe5dcaSAlan Stern */ 188241341261SMathias Nyman *ppowner = &(hub->ports[port1 - 1]->port_owner); 18837cbe5dcaSAlan Stern return 0; 18847cbe5dcaSAlan Stern } 18857cbe5dcaSAlan Stern 18867cbe5dcaSAlan Stern /* In the following three functions, the caller must hold hdev's lock */ 1887336c5c31SLan Tianyu int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, 18889b6f0c4bSValentina Manea struct usb_dev_state *owner) 18897cbe5dcaSAlan Stern { 18907cbe5dcaSAlan Stern int rc; 18919b6f0c4bSValentina Manea struct usb_dev_state **powner; 18927cbe5dcaSAlan Stern 18937cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 18947cbe5dcaSAlan Stern if (rc) 18957cbe5dcaSAlan Stern return rc; 18967cbe5dcaSAlan Stern if (*powner) 18977cbe5dcaSAlan Stern return -EBUSY; 18987cbe5dcaSAlan Stern *powner = owner; 18997cbe5dcaSAlan Stern return rc; 19007cbe5dcaSAlan Stern } 19016080cd0eSValentina Manea EXPORT_SYMBOL_GPL(usb_hub_claim_port); 19027cbe5dcaSAlan Stern 1903336c5c31SLan Tianyu int usb_hub_release_port(struct usb_device *hdev, unsigned port1, 19049b6f0c4bSValentina Manea struct usb_dev_state *owner) 19057cbe5dcaSAlan Stern { 19067cbe5dcaSAlan Stern int rc; 19079b6f0c4bSValentina Manea struct usb_dev_state **powner; 19087cbe5dcaSAlan Stern 19097cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 19107cbe5dcaSAlan Stern if (rc) 19117cbe5dcaSAlan Stern return rc; 19127cbe5dcaSAlan Stern if (*powner != owner) 19137cbe5dcaSAlan Stern return -ENOENT; 19147cbe5dcaSAlan Stern *powner = NULL; 19157cbe5dcaSAlan Stern return rc; 19167cbe5dcaSAlan Stern } 19176080cd0eSValentina Manea EXPORT_SYMBOL_GPL(usb_hub_release_port); 19187cbe5dcaSAlan Stern 19199b6f0c4bSValentina Manea void usb_hub_release_all_ports(struct usb_device *hdev, struct usb_dev_state *owner) 19207cbe5dcaSAlan Stern { 1921ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 19227cbe5dcaSAlan Stern int n; 19237cbe5dcaSAlan Stern 1924fa2a9566SLan Tianyu for (n = 0; n < hdev->maxchild; n++) { 1925fa2a9566SLan Tianyu if (hub->ports[n]->port_owner == owner) 1926fa2a9566SLan Tianyu hub->ports[n]->port_owner = NULL; 19277cbe5dcaSAlan Stern } 1928fa2a9566SLan Tianyu 19297cbe5dcaSAlan Stern } 19307cbe5dcaSAlan Stern 19317cbe5dcaSAlan Stern /* The caller must hold udev's lock */ 19327cbe5dcaSAlan Stern bool usb_device_is_owned(struct usb_device *udev) 19337cbe5dcaSAlan Stern { 19347cbe5dcaSAlan Stern struct usb_hub *hub; 19357cbe5dcaSAlan Stern 19367cbe5dcaSAlan Stern if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) 19377cbe5dcaSAlan Stern return false; 1938ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 1939fa2a9566SLan Tianyu return !!hub->ports[udev->portnum - 1]->port_owner; 19407cbe5dcaSAlan Stern } 19417cbe5dcaSAlan Stern 19421da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 19431da177e4SLinus Torvalds { 1944ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev); 19451da177e4SLinus Torvalds int i; 19461da177e4SLinus Torvalds 19471da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 1948ff823c79SLan Tianyu if (hub->ports[i]->child) 1949ff823c79SLan Tianyu recursively_mark_NOTATTACHED(hub->ports[i]->child); 19501da177e4SLinus Torvalds } 19519bbdf1e0SAlan Stern if (udev->state == USB_STATE_SUSPENDED) 195215123006SSarah Sharp udev->active_duration -= jiffies; 19531da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 19541da177e4SLinus Torvalds } 19551da177e4SLinus Torvalds 19561da177e4SLinus Torvalds /** 19571da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 19581da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 19591da177e4SLinus Torvalds * @new_state: new state value to be stored 19601da177e4SLinus Torvalds * 19611da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 19621da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 19631da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 19641da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 19651da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 19661da177e4SLinus Torvalds * all changes to any device's state must be protected by the 19671da177e4SLinus Torvalds * device_state_lock spinlock. 19681da177e4SLinus Torvalds * 19691da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 19701da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 19711da177e4SLinus Torvalds * 19721da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 19731da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 19741da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 19751da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 19761da177e4SLinus Torvalds */ 19771da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 19781da177e4SLinus Torvalds enum usb_device_state new_state) 19791da177e4SLinus Torvalds { 19801da177e4SLinus Torvalds unsigned long flags; 19814681b171SRafael J. Wysocki int wakeup = -1; 19821da177e4SLinus Torvalds 19831da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 19841da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 19851da177e4SLinus Torvalds ; /* do nothing */ 1986b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1987fb669cc0SDavid Brownell 1988fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1989fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1990fb669cc0SDavid Brownell */ 1991fb669cc0SDavid Brownell if (udev->parent) { 1992645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1993645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1994645daaabSAlan Stern ; /* No change to wakeup settings */ 1995645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 1996ddbe1fcaSLu Baolu wakeup = (udev->quirks & 1997ddbe1fcaSLu Baolu USB_QUIRK_IGNORE_REMOTE_WAKEUP) ? 0 : 1998ddbe1fcaSLu Baolu udev->actconfig->desc.bmAttributes & 1999ddbe1fcaSLu Baolu USB_CONFIG_ATT_WAKEUP; 2000645daaabSAlan Stern else 20014681b171SRafael J. Wysocki wakeup = 0; 2002fb669cc0SDavid Brownell } 200315123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED && 200415123006SSarah Sharp new_state != USB_STATE_SUSPENDED) 200515123006SSarah Sharp udev->active_duration -= jiffies; 200615123006SSarah Sharp else if (new_state == USB_STATE_SUSPENDED && 200715123006SSarah Sharp udev->state != USB_STATE_SUSPENDED) 200815123006SSarah Sharp udev->active_duration += jiffies; 2009645daaabSAlan Stern udev->state = new_state; 2010b94dc6b5SDavid Brownell } else 20111da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 20121da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 20134681b171SRafael J. Wysocki if (wakeup >= 0) 20144681b171SRafael J. Wysocki device_set_wakeup_capable(&udev->dev, wakeup); 20151da177e4SLinus Torvalds } 20166da9c990SDavid Vrabel EXPORT_SYMBOL_GPL(usb_set_device_state); 20171da177e4SLinus Torvalds 20188af548dcSInaky Perez-Gonzalez /* 20193b29b68bSAlan Stern * Choose a device number. 20203b29b68bSAlan Stern * 20213b29b68bSAlan Stern * Device numbers are used as filenames in usbfs. On USB-1.1 and 20223b29b68bSAlan Stern * USB-2.0 buses they are also used as device addresses, however on 20233b29b68bSAlan Stern * USB-3.0 buses the address is assigned by the controller hardware 20243b29b68bSAlan Stern * and it usually is not the same as the device number. 20253b29b68bSAlan Stern * 20268af548dcSInaky Perez-Gonzalez * WUSB devices are simple: they have no hubs behind, so the mapping 20278af548dcSInaky Perez-Gonzalez * device <-> virtual port number becomes 1:1. Why? to simplify the 20288af548dcSInaky Perez-Gonzalez * life of the device connection logic in 20298af548dcSInaky Perez-Gonzalez * drivers/usb/wusbcore/devconnect.c. When we do the initial secret 20308af548dcSInaky Perez-Gonzalez * handshake we need to assign a temporary address in the unauthorized 20318af548dcSInaky Perez-Gonzalez * space. For simplicity we use the first virtual port number found to 20328af548dcSInaky Perez-Gonzalez * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] 20338af548dcSInaky Perez-Gonzalez * and that becomes it's address [X < 128] or its unauthorized address 20348af548dcSInaky Perez-Gonzalez * [X | 0x80]. 20358af548dcSInaky Perez-Gonzalez * 20368af548dcSInaky Perez-Gonzalez * We add 1 as an offset to the one-based USB-stack port number 20378af548dcSInaky Perez-Gonzalez * (zero-based wusb virtual port index) for two reasons: (a) dev addr 20388af548dcSInaky Perez-Gonzalez * 0 is reserved by USB for default address; (b) Linux's USB stack 20398af548dcSInaky Perez-Gonzalez * uses always #1 for the root hub of the controller. So USB stack's 20408af548dcSInaky Perez-Gonzalez * port #1, which is wusb virtual-port #0 has address #2. 2041c6515272SSarah Sharp * 2042c6515272SSarah Sharp * Devices connected under xHCI are not as simple. The host controller 2043c6515272SSarah Sharp * supports virtualization, so the hardware assigns device addresses and 2044c6515272SSarah Sharp * the HCD must setup data structures before issuing a set address 2045c6515272SSarah Sharp * command to the hardware. 20468af548dcSInaky Perez-Gonzalez */ 20473b29b68bSAlan Stern static void choose_devnum(struct usb_device *udev) 20481da177e4SLinus Torvalds { 20491da177e4SLinus Torvalds int devnum; 20501da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 20511da177e4SLinus Torvalds 2052638139ebSPetr Mladek /* be safe when more hub events are proceed in parallel */ 2053638139ebSPetr Mladek mutex_lock(&bus->usb_address0_mutex); 20548af548dcSInaky Perez-Gonzalez if (udev->wusb) { 20558af548dcSInaky Perez-Gonzalez devnum = udev->portnum + 1; 20568af548dcSInaky Perez-Gonzalez BUG_ON(test_bit(devnum, bus->devmap.devicemap)); 20578af548dcSInaky Perez-Gonzalez } else { 20588af548dcSInaky Perez-Gonzalez /* Try to allocate the next devnum beginning at 20598af548dcSInaky Perez-Gonzalez * bus->devnum_next. */ 20601da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 20611da177e4SLinus Torvalds bus->devnum_next); 20621da177e4SLinus Torvalds if (devnum >= 128) 20638af548dcSInaky Perez-Gonzalez devnum = find_next_zero_bit(bus->devmap.devicemap, 20648af548dcSInaky Perez-Gonzalez 128, 1); 20651da177e4SLinus Torvalds bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1); 20668af548dcSInaky Perez-Gonzalez } 20671da177e4SLinus Torvalds if (devnum < 128) { 20681da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 20691da177e4SLinus Torvalds udev->devnum = devnum; 20701da177e4SLinus Torvalds } 2071638139ebSPetr Mladek mutex_unlock(&bus->usb_address0_mutex); 20721da177e4SLinus Torvalds } 20731da177e4SLinus Torvalds 20743b29b68bSAlan Stern static void release_devnum(struct usb_device *udev) 20751da177e4SLinus Torvalds { 20761da177e4SLinus Torvalds if (udev->devnum > 0) { 20771da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 20781da177e4SLinus Torvalds udev->devnum = -1; 20791da177e4SLinus Torvalds } 20801da177e4SLinus Torvalds } 20811da177e4SLinus Torvalds 20823b29b68bSAlan Stern static void update_devnum(struct usb_device *udev, int devnum) 20834953d141SDavid Vrabel { 20844953d141SDavid Vrabel /* The address for a WUSB device is managed by wusbcore. */ 20854953d141SDavid Vrabel if (!udev->wusb) 20864953d141SDavid Vrabel udev->devnum = devnum; 20874953d141SDavid Vrabel } 20884953d141SDavid Vrabel 2089f7410cedSHerbert Xu static void hub_free_dev(struct usb_device *udev) 2090f7410cedSHerbert Xu { 2091f7410cedSHerbert Xu struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2092f7410cedSHerbert Xu 2093f7410cedSHerbert Xu /* Root hubs aren't real devices, so don't free HCD resources */ 2094f7410cedSHerbert Xu if (hcd->driver->free_dev && udev->parent) 2095f7410cedSHerbert Xu hcd->driver->free_dev(hcd, udev); 2096f7410cedSHerbert Xu } 2097f7410cedSHerbert Xu 20987027df36SDan Williams static void hub_disconnect_children(struct usb_device *udev) 20997027df36SDan Williams { 21007027df36SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(udev); 21017027df36SDan Williams int i; 21027027df36SDan Williams 21037027df36SDan Williams /* Free up all the children before we remove this device */ 21047027df36SDan Williams for (i = 0; i < udev->maxchild; i++) { 21057027df36SDan Williams if (hub->ports[i]->child) 21067027df36SDan Williams usb_disconnect(&hub->ports[i]->child); 21077027df36SDan Williams } 21087027df36SDan Williams } 21097027df36SDan Williams 21101da177e4SLinus Torvalds /** 21111da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 21121da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 21131da177e4SLinus Torvalds * Context: !in_interrupt () 21141da177e4SLinus Torvalds * 21151da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 21161da177e4SLinus Torvalds * 21171da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 2118db8f2aa3SBjorn Helgaas * If *pdev is a root hub then the caller must hold the usb_bus_list_lock, 2119db8f2aa3SBjorn Helgaas * which protects the set of root hubs as well as the list of buses. 21201da177e4SLinus Torvalds * 21211da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 21221da177e4SLinus Torvalds * controllers) should ever call this. 21231da177e4SLinus Torvalds * 21241da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 21251da177e4SLinus Torvalds */ 21261da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 21271da177e4SLinus Torvalds { 21287027df36SDan Williams struct usb_port *port_dev = NULL; 21291da177e4SLinus Torvalds struct usb_device *udev = *pdev; 21305b1dc209SPeter Chen struct usb_hub *hub = NULL; 21315b1dc209SPeter Chen int port1 = 1; 21321da177e4SLinus Torvalds 21331da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 21341da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 213525985edcSLucas De Marchi * this quiesces everything except pending urbs. 21361da177e4SLinus Torvalds */ 21371da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 21383b29b68bSAlan Stern dev_info(&udev->dev, "USB disconnect, device number %d\n", 21393b29b68bSAlan Stern udev->devnum); 21401da177e4SLinus Torvalds 21419ad3d6ccSAlan Stern usb_lock_device(udev); 21429ad3d6ccSAlan Stern 21437027df36SDan Williams hub_disconnect_children(udev); 21441da177e4SLinus Torvalds 21451da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 21461da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 21471da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 21481da177e4SLinus Torvalds */ 2149782da727SAlan Stern dev_dbg(&udev->dev, "unregistering device\n"); 21501da177e4SLinus Torvalds usb_disable_device(udev, 0); 2151cde217a5SAlan Stern usb_hcd_synchronize_unlinks(udev); 21521da177e4SLinus Torvalds 2153fde26380SLan Tianyu if (udev->parent) { 21547027df36SDan Williams port1 = udev->portnum; 21557027df36SDan Williams hub = usb_hub_to_struct_hub(udev->parent); 21567027df36SDan Williams port_dev = hub->ports[port1 - 1]; 2157fde26380SLan Tianyu 2158fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2159fde26380SLan Tianyu sysfs_remove_link(&port_dev->dev.kobj, "device"); 2160971fcd49SLan Tianyu 21617027df36SDan Williams /* 21627027df36SDan Williams * As usb_port_runtime_resume() de-references udev, make 21637027df36SDan Williams * sure no resumes occur during removal 21647027df36SDan Williams */ 21657027df36SDan Williams if (!test_and_set_bit(port1, hub->child_usage_bits)) 21667027df36SDan Williams pm_runtime_get_sync(&port_dev->dev); 2167fde26380SLan Tianyu } 2168fde26380SLan Tianyu 21693b23dd6fSAlan Stern usb_remove_ep_devs(&udev->ep0); 2170782da727SAlan Stern usb_unlock_device(udev); 21713099e75aSGreg Kroah-Hartman 2172782da727SAlan Stern /* Unregister the device. The device driver is responsible 21733b23dd6fSAlan Stern * for de-configuring the device and invoking the remove-device 21743b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2175782da727SAlan Stern */ 2176782da727SAlan Stern device_del(&udev->dev); 2177782da727SAlan Stern 2178782da727SAlan Stern /* Free the device number and delete the parent's children[] 21791da177e4SLinus Torvalds * (or root_hub) pointer. 21801da177e4SLinus Torvalds */ 21813b29b68bSAlan Stern release_devnum(udev); 21821da177e4SLinus Torvalds 21831da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 21841da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 21851da177e4SLinus Torvalds *pdev = NULL; 21861da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 21871da177e4SLinus Torvalds 21887027df36SDan Williams if (port_dev && test_and_clear_bit(port1, hub->child_usage_bits)) 21897027df36SDan Williams pm_runtime_put(&port_dev->dev); 21907027df36SDan Williams 2191f7410cedSHerbert Xu hub_free_dev(udev); 2192f7410cedSHerbert Xu 2193782da727SAlan Stern put_device(&udev->dev); 21941da177e4SLinus Torvalds } 21951da177e4SLinus Torvalds 2196f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 21971da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 21981da177e4SLinus Torvalds { 21991da177e4SLinus Torvalds if (!string) 22001da177e4SLinus Torvalds return; 2201f2ec522eSJoe Perches dev_info(&udev->dev, "%s: %s\n", id, string); 22021da177e4SLinus Torvalds } 22031da177e4SLinus Torvalds 2204f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 2205f2a383e4SGreg Kroah-Hartman { 2206f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", 2207f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 2208f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idProduct)); 2209b9cef6c3SWu Fengguang dev_info(&udev->dev, 2210b9cef6c3SWu Fengguang "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", 2211f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 2212f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 2213f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 2214f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 2215f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 2216f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 2217f2a383e4SGreg Kroah-Hartman } 22181da177e4SLinus Torvalds #else 2219f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 22201da177e4SLinus Torvalds #endif 22211da177e4SLinus Torvalds 22221da177e4SLinus Torvalds 22233ede760fSOliver Neukum /** 22248d8558d1SAlan Stern * usb_enumerate_device_otg - FIXME (usbcore-internal) 22253ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 22263ede760fSOliver Neukum * 22278d8558d1SAlan Stern * Finish enumeration for On-The-Go devices 2228626f090cSYacine Belkadi * 2229626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 22303ede760fSOliver Neukum */ 22318d8558d1SAlan Stern static int usb_enumerate_device_otg(struct usb_device *udev) 22321da177e4SLinus Torvalds { 2233d9d16e8aSInaky Perez-Gonzalez int err = 0; 22341da177e4SLinus Torvalds 22351da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 22361da177e4SLinus Torvalds /* 22371da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 22381da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 22391da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 22401da177e4SLinus Torvalds */ 22411da177e4SLinus Torvalds if (!udev->bus->is_b_host 22421da177e4SLinus Torvalds && udev->config 22431da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 22442eb5052eSFelipe Balbi struct usb_otg_descriptor *desc = NULL; 22451da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 224612c3da34SAlan Stern unsigned port1 = udev->portnum; 22471da177e4SLinus Torvalds 22487d2d641cSLi Jun /* descriptor may appear anywhere in config */ 22497d2d641cSLi Jun err = __usb_get_extra_descriptor(udev->rawdescriptors[0], 22507d2d641cSLi Jun le16_to_cpu(udev->config[0].desc.wTotalLength), 22517d2d641cSLi Jun USB_DT_OTG, (void **) &desc); 22527d2d641cSLi Jun if (err || !(desc->bmAttributes & USB_OTG_HNP)) 22537d2d641cSLi Jun return 0; 22547d2d641cSLi Jun 22557d2d641cSLi Jun dev_info(&udev->dev, "Dual-Role OTG device on %sHNP port\n", 22567d2d641cSLi Jun (port1 == bus->otg_port) ? "" : "non-"); 22571da177e4SLinus Torvalds 22581da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 22597d2d641cSLi Jun if (port1 == bus->otg_port) { 22601da177e4SLinus Torvalds bus->b_hnp_enable = 1; 22611da177e4SLinus Torvalds err = usb_control_msg(udev, 22621da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 22631da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 22647d2d641cSLi Jun USB_DEVICE_B_HNP_ENABLE, 22657d2d641cSLi Jun 0, NULL, 0, 22667d2d641cSLi Jun USB_CTRL_SET_TIMEOUT); 22671da177e4SLinus Torvalds if (err < 0) { 22687d2d641cSLi Jun /* 22697d2d641cSLi Jun * OTG MESSAGE: report errors here, 22701da177e4SLinus Torvalds * customize to match your product. 22711da177e4SLinus Torvalds */ 22727d2d641cSLi Jun dev_err(&udev->dev, "can't set HNP mode: %d\n", 22731da177e4SLinus Torvalds err); 22741da177e4SLinus Torvalds bus->b_hnp_enable = 0; 22751da177e4SLinus Torvalds } 22767d2d641cSLi Jun } else if (desc->bLength == sizeof 22777d2d641cSLi Jun (struct usb_otg_descriptor)) { 22787d2d641cSLi Jun /* Set a_alt_hnp_support for legacy otg device */ 22797d2d641cSLi Jun err = usb_control_msg(udev, 22807d2d641cSLi Jun usb_sndctrlpipe(udev, 0), 22817d2d641cSLi Jun USB_REQ_SET_FEATURE, 0, 22827d2d641cSLi Jun USB_DEVICE_A_ALT_HNP_SUPPORT, 22837d2d641cSLi Jun 0, NULL, 0, 22847d2d641cSLi Jun USB_CTRL_SET_TIMEOUT); 22857d2d641cSLi Jun if (err < 0) 22867d2d641cSLi Jun dev_err(&udev->dev, 22877d2d641cSLi Jun "set a_alt_hnp_support failed: %d\n", 22887d2d641cSLi Jun err); 22891da177e4SLinus Torvalds } 22901da177e4SLinus Torvalds } 22911da177e4SLinus Torvalds #endif 2292d9d16e8aSInaky Perez-Gonzalez return err; 2293d9d16e8aSInaky Perez-Gonzalez } 22941da177e4SLinus Torvalds 2295d9d16e8aSInaky Perez-Gonzalez 2296d9d16e8aSInaky Perez-Gonzalez /** 22978d8558d1SAlan Stern * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) 2298d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2299d9d16e8aSInaky Perez-Gonzalez * 2300d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 2301d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 2302d9d16e8aSInaky Perez-Gonzalez * environment. 2303d9d16e8aSInaky Perez-Gonzalez * 2304d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 2305d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 2306d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 2307626f090cSYacine Belkadi * 2308626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 2309d9d16e8aSInaky Perez-Gonzalez */ 23108d8558d1SAlan Stern static int usb_enumerate_device(struct usb_device *udev) 2311d9d16e8aSInaky Perez-Gonzalez { 2312d9d16e8aSInaky Perez-Gonzalez int err; 2313026f3fcbSPeter Chen struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2314d9d16e8aSInaky Perez-Gonzalez 2315d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 2316d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 2317d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 2318e9e88fb7SAlan Stern if (err != -ENODEV) 2319d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 2320d9d16e8aSInaky Perez-Gonzalez err); 232180da2e0dSLaurent Pinchart return err; 2322d9d16e8aSInaky Perez-Gonzalez } 2323d9d16e8aSInaky Perez-Gonzalez } 232483e83ecbSThomas Pugliese 2325d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 2326d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 2327d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 2328d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 2329d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 233083e83ecbSThomas Pugliese 23318d8558d1SAlan Stern err = usb_enumerate_device_otg(udev); 233280da2e0dSLaurent Pinchart if (err < 0) 2333d9d16e8aSInaky Perez-Gonzalez return err; 233480da2e0dSLaurent Pinchart 2335026f3fcbSPeter Chen if (IS_ENABLED(CONFIG_USB_OTG_WHITELIST) && hcd->tpl_support && 2336e5a9d621SPeter Chen !is_targeted(udev)) { 2337026f3fcbSPeter Chen /* Maybe it can talk to us, though we can't talk to it. 2338026f3fcbSPeter Chen * (Includes HNP test device.) 2339026f3fcbSPeter Chen */ 2340e5a9d621SPeter Chen if (IS_ENABLED(CONFIG_USB_OTG) && (udev->bus->b_hnp_enable 2341e5a9d621SPeter Chen || udev->bus->is_b_host)) { 2342026f3fcbSPeter Chen err = usb_port_suspend(udev, PMSG_AUTO_SUSPEND); 2343026f3fcbSPeter Chen if (err < 0) 2344026f3fcbSPeter Chen dev_dbg(&udev->dev, "HNP fail, %d\n", err); 2345026f3fcbSPeter Chen } 2346026f3fcbSPeter Chen return -ENOTSUPP; 2347026f3fcbSPeter Chen } 2348026f3fcbSPeter Chen 234980da2e0dSLaurent Pinchart usb_detect_interface_quirks(udev); 235080da2e0dSLaurent Pinchart 235180da2e0dSLaurent Pinchart return 0; 2352d9d16e8aSInaky Perez-Gonzalez } 2353d9d16e8aSInaky Perez-Gonzalez 2354d35e70d5SMatthew Garrett static void set_usb_port_removable(struct usb_device *udev) 2355d35e70d5SMatthew Garrett { 2356d35e70d5SMatthew Garrett struct usb_device *hdev = udev->parent; 2357d35e70d5SMatthew Garrett struct usb_hub *hub; 2358d35e70d5SMatthew Garrett u8 port = udev->portnum; 2359d35e70d5SMatthew Garrett u16 wHubCharacteristics; 2360d35e70d5SMatthew Garrett bool removable = true; 2361d35e70d5SMatthew Garrett 2362d35e70d5SMatthew Garrett if (!hdev) 2363d35e70d5SMatthew Garrett return; 2364d35e70d5SMatthew Garrett 2365ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 2366d35e70d5SMatthew Garrett 236792bfbf71SMatthew Garrett /* 236892bfbf71SMatthew Garrett * If the platform firmware has provided information about a port, 236992bfbf71SMatthew Garrett * use that to determine whether it's removable. 237092bfbf71SMatthew Garrett */ 237192bfbf71SMatthew Garrett switch (hub->ports[udev->portnum - 1]->connect_type) { 237292bfbf71SMatthew Garrett case USB_PORT_CONNECT_TYPE_HOT_PLUG: 237392bfbf71SMatthew Garrett udev->removable = USB_DEVICE_REMOVABLE; 237492bfbf71SMatthew Garrett return; 237592bfbf71SMatthew Garrett case USB_PORT_CONNECT_TYPE_HARD_WIRED: 237658339c2eSMatthew Garrett case USB_PORT_NOT_USED: 237792bfbf71SMatthew Garrett udev->removable = USB_DEVICE_FIXED; 237892bfbf71SMatthew Garrett return; 237958339c2eSMatthew Garrett default: 238058339c2eSMatthew Garrett break; 238192bfbf71SMatthew Garrett } 238292bfbf71SMatthew Garrett 238392bfbf71SMatthew Garrett /* 238492bfbf71SMatthew Garrett * Otherwise, check whether the hub knows whether a port is removable 238592bfbf71SMatthew Garrett * or not 238692bfbf71SMatthew Garrett */ 2387d35e70d5SMatthew Garrett wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 2388d35e70d5SMatthew Garrett 2389d35e70d5SMatthew Garrett if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) 2390d35e70d5SMatthew Garrett return; 2391d35e70d5SMatthew Garrett 2392d35e70d5SMatthew Garrett if (hub_is_superspeed(hdev)) { 2393ca3c1539SLan Tianyu if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) 2394ca3c1539SLan Tianyu & (1 << port)) 2395d35e70d5SMatthew Garrett removable = false; 2396d35e70d5SMatthew Garrett } else { 2397d35e70d5SMatthew Garrett if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) 2398d35e70d5SMatthew Garrett removable = false; 2399d35e70d5SMatthew Garrett } 2400d35e70d5SMatthew Garrett 2401d35e70d5SMatthew Garrett if (removable) 2402d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_REMOVABLE; 2403d35e70d5SMatthew Garrett else 2404d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_FIXED; 2405a4204ff0SDan Williams 2406d35e70d5SMatthew Garrett } 2407d9d16e8aSInaky Perez-Gonzalez 2408d9d16e8aSInaky Perez-Gonzalez /** 2409d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 2410d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2411d9d16e8aSInaky Perez-Gonzalez * 24128d8558d1SAlan Stern * This is called with devices which have been detected but not fully 24138d8558d1SAlan Stern * enumerated. The device descriptor is available, but not descriptors 2414d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 2415d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 2416d9d16e8aSInaky Perez-Gonzalez * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 2417d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 2418d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 2419d9d16e8aSInaky Perez-Gonzalez * 2420d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 2421d9d16e8aSInaky Perez-Gonzalez * 2422d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 2423626f090cSYacine Belkadi * 2424626f090cSYacine Belkadi * Return: Whether the device is configured properly or not. Zero if the 2425626f090cSYacine Belkadi * interface was registered with the driver core; else a negative errno 2426626f090cSYacine Belkadi * value. 2427626f090cSYacine Belkadi * 2428d9d16e8aSInaky Perez-Gonzalez */ 2429d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 2430d9d16e8aSInaky Perez-Gonzalez { 2431d9d16e8aSInaky Perez-Gonzalez int err; 2432d9d16e8aSInaky Perez-Gonzalez 243316985408SDan Streetman if (udev->parent) { 243416985408SDan Streetman /* Initialize non-root-hub device wakeup to disabled; 243516985408SDan Streetman * device (un)configuration controls wakeup capable 243616985408SDan Streetman * sysfs power/wakeup controls wakeup enabled/disabled 243716985408SDan Streetman */ 243816985408SDan Streetman device_init_wakeup(&udev->dev, 0); 243916985408SDan Streetman } 244016985408SDan Streetman 24419bbdf1e0SAlan Stern /* Tell the runtime-PM framework the device is active */ 24429bbdf1e0SAlan Stern pm_runtime_set_active(&udev->dev); 2443c08512c7SAlan Stern pm_runtime_get_noresume(&udev->dev); 2444fcc4a01eSAlan Stern pm_runtime_use_autosuspend(&udev->dev); 24459bbdf1e0SAlan Stern pm_runtime_enable(&udev->dev); 24469bbdf1e0SAlan Stern 2447c08512c7SAlan Stern /* By default, forbid autosuspend for all devices. It will be 2448c08512c7SAlan Stern * allowed for hubs during binding. 2449c08512c7SAlan Stern */ 2450c08512c7SAlan Stern usb_disable_autosuspend(udev); 2451c08512c7SAlan Stern 24528d8558d1SAlan Stern err = usb_enumerate_device(udev); /* Read descriptors */ 2453d9d16e8aSInaky Perez-Gonzalez if (err < 0) 2454d9d16e8aSInaky Perez-Gonzalez goto fail; 2455c6515272SSarah Sharp dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", 2456c6515272SSarah Sharp udev->devnum, udev->bus->busnum, 2457c6515272SSarah Sharp (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 24589f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 24599f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 24609f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 24619f8b17e6SKay Sievers 24626cd13201SAlan Stern /* Tell the world! */ 24636cd13201SAlan Stern announce_device(udev); 2464195af2ccSAlan Stern 2465b04b3156STheodore Ts'o if (udev->serial) 2466b04b3156STheodore Ts'o add_device_randomness(udev->serial, strlen(udev->serial)); 2467b04b3156STheodore Ts'o if (udev->product) 2468b04b3156STheodore Ts'o add_device_randomness(udev->product, strlen(udev->product)); 2469b04b3156STheodore Ts'o if (udev->manufacturer) 2470b04b3156STheodore Ts'o add_device_randomness(udev->manufacturer, 2471b04b3156STheodore Ts'o strlen(udev->manufacturer)); 2472b04b3156STheodore Ts'o 2473927bc916SRafael J. Wysocki device_enable_async_suspend(&udev->dev); 2474d35e70d5SMatthew Garrett 2475a4204ff0SDan Williams /* check whether the hub or firmware marks this port as non-removable */ 2476d35e70d5SMatthew Garrett if (udev->parent) 2477d35e70d5SMatthew Garrett set_usb_port_removable(udev); 2478d35e70d5SMatthew Garrett 2479782da727SAlan Stern /* Register the device. The device driver is responsible 24803b23dd6fSAlan Stern * for configuring the device and invoking the add-device 24813b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2482782da727SAlan Stern */ 24831da177e4SLinus Torvalds err = device_add(&udev->dev); 24841da177e4SLinus Torvalds if (err) { 24851da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 24861da177e4SLinus Torvalds goto fail; 24871da177e4SLinus Torvalds } 24889ad3d6ccSAlan Stern 2489fde26380SLan Tianyu /* Create link files between child device and usb port device. */ 2490fde26380SLan Tianyu if (udev->parent) { 2491ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2492d5c3834eSDan Williams int port1 = udev->portnum; 2493d5c3834eSDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 2494fde26380SLan Tianyu 2495fde26380SLan Tianyu err = sysfs_create_link(&udev->dev.kobj, 2496fde26380SLan Tianyu &port_dev->dev.kobj, "port"); 2497fde26380SLan Tianyu if (err) 2498fde26380SLan Tianyu goto fail; 2499fde26380SLan Tianyu 2500fde26380SLan Tianyu err = sysfs_create_link(&port_dev->dev.kobj, 2501fde26380SLan Tianyu &udev->dev.kobj, "device"); 2502fde26380SLan Tianyu if (err) { 2503fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2504fde26380SLan Tianyu goto fail; 2505fde26380SLan Tianyu } 2506971fcd49SLan Tianyu 2507d5c3834eSDan Williams if (!test_and_set_bit(port1, hub->child_usage_bits)) 2508971fcd49SLan Tianyu pm_runtime_get_sync(&port_dev->dev); 2509fde26380SLan Tianyu } 2510fde26380SLan Tianyu 25113b23dd6fSAlan Stern (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); 2512c08512c7SAlan Stern usb_mark_last_busy(udev); 2513c08512c7SAlan Stern pm_runtime_put_sync_autosuspend(&udev->dev); 2514c066475eSGreg Kroah-Hartman return err; 25151da177e4SLinus Torvalds 25161da177e4SLinus Torvalds fail: 25171da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 25189bbdf1e0SAlan Stern pm_runtime_disable(&udev->dev); 25199bbdf1e0SAlan Stern pm_runtime_set_suspended(&udev->dev); 2520d9d16e8aSInaky Perez-Gonzalez return err; 25211da177e4SLinus Torvalds } 25221da177e4SLinus Torvalds 252393993a0aSInaky Perez-Gonzalez 252493993a0aSInaky Perez-Gonzalez /** 2525fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 2526fd39c86bSRandy Dunlap * @usb_dev: USB device 2527fd39c86bSRandy Dunlap * 2528fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 2529fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 253093993a0aSInaky Perez-Gonzalez * 253193993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 253293993a0aSInaky Perez-Gonzalez * defer its call. 2533626f090cSYacine Belkadi * 2534626f090cSYacine Belkadi * Return: 0. 253593993a0aSInaky Perez-Gonzalez */ 253693993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 253793993a0aSInaky Perez-Gonzalez { 253893993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 253993993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 254093993a0aSInaky Perez-Gonzalez goto out_unauthorized; 2541da307123SAlan Stern 254293993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 254393993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 2544da307123SAlan Stern 254593993a0aSInaky Perez-Gonzalez out_unauthorized: 254693993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 254793993a0aSInaky Perez-Gonzalez return 0; 254893993a0aSInaky Perez-Gonzalez } 254993993a0aSInaky Perez-Gonzalez 255093993a0aSInaky Perez-Gonzalez 255193993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 255293993a0aSInaky Perez-Gonzalez { 255393993a0aSInaky Perez-Gonzalez int result = 0, c; 2554da307123SAlan Stern 255593993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 255693993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 255793993a0aSInaky Perez-Gonzalez goto out_authorized; 2558da307123SAlan Stern 255993993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 256093993a0aSInaky Perez-Gonzalez if (result < 0) { 256193993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 256293993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 256393993a0aSInaky Perez-Gonzalez goto error_autoresume; 256493993a0aSInaky Perez-Gonzalez } 2565e50a322eSJosef Gajdusek 2566e50a322eSJosef Gajdusek if (usb_dev->wusb) { 256793993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 256893993a0aSInaky Perez-Gonzalez if (result < 0) { 256993993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 257093993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 257193993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 257293993a0aSInaky Perez-Gonzalez } 2573e50a322eSJosef Gajdusek } 2574da307123SAlan Stern 257593993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 257693993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 257793993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 257893993a0aSInaky Perez-Gonzalez */ 2579b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 258093993a0aSInaky Perez-Gonzalez if (c >= 0) { 258193993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 258293993a0aSInaky Perez-Gonzalez if (result) { 258393993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 258493993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 258593993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 258693993a0aSInaky Perez-Gonzalez * set other configurations. */ 258793993a0aSInaky Perez-Gonzalez } 258893993a0aSInaky Perez-Gonzalez } 258993993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 2590da307123SAlan Stern 259193993a0aSInaky Perez-Gonzalez error_device_descriptor: 2592da307123SAlan Stern usb_autosuspend_device(usb_dev); 259393993a0aSInaky Perez-Gonzalez error_autoresume: 259493993a0aSInaky Perez-Gonzalez out_authorized: 2595781b2137SMatthias Beyer usb_unlock_device(usb_dev); /* complements locktree */ 259693993a0aSInaky Perez-Gonzalez return result; 259793993a0aSInaky Perez-Gonzalez } 259893993a0aSInaky Perez-Gonzalez 259993993a0aSInaky Perez-Gonzalez 26000165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 26010165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 26020165de09SInaky Perez-Gonzalez { 26030165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 26040165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 26050165de09SInaky Perez-Gonzalez return 0; 26060165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 26070165de09SInaky Perez-Gonzalez return hcd->wireless; 26080165de09SInaky Perez-Gonzalez } 26090165de09SInaky Perez-Gonzalez 26100165de09SInaky Perez-Gonzalez 26111da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 26121da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 26131da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 26141da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 261590ab5ee9SRusty Russell #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first) 26161da177e4SLinus Torvalds 26171da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 26181da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 261975d7cf72SAndiry Xu #define HUB_BH_RESET_TIME 50 26201da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 262177c7f072SSarah Sharp #define HUB_RESET_TIMEOUT 800 26221da177e4SLinus Torvalds 262348fc7dbdSDan Williams /* 262448fc7dbdSDan Williams * "New scheme" enumeration causes an extra state transition to be 262548fc7dbdSDan Williams * exposed to an xhci host and causes USB3 devices to receive control 262648fc7dbdSDan Williams * commands in the default state. This has been seen to cause 262748fc7dbdSDan Williams * enumeration failures, so disable this enumeration scheme for USB3 262848fc7dbdSDan Williams * devices. 262948fc7dbdSDan Williams */ 263048fc7dbdSDan Williams static bool use_new_scheme(struct usb_device *udev, int retry) 263148fc7dbdSDan Williams { 263248fc7dbdSDan Williams if (udev->speed == USB_SPEED_SUPER) 263348fc7dbdSDan Williams return false; 263448fc7dbdSDan Williams 263548fc7dbdSDan Williams return USE_NEW_SCHEME(retry); 263648fc7dbdSDan Williams } 263748fc7dbdSDan Williams 2638025d4430SRahul Bedarkar /* Is a USB 3.0 port in the Inactive or Compliance Mode state? 26398bea2bd3SStanislaw Ledwon * Port worm reset is required to recover 26408bea2bd3SStanislaw Ledwon */ 26413cd12f91SDan Williams static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1, 26423cd12f91SDan Williams u16 portstatus) 264310d674a8SSarah Sharp { 26443cd12f91SDan Williams u16 link_state; 26453cd12f91SDan Williams 26463cd12f91SDan Williams if (!hub_is_superspeed(hub->hdev)) 26473cd12f91SDan Williams return false; 26483cd12f91SDan Williams 26493cd12f91SDan Williams if (test_bit(port1, hub->warm_reset_bits)) 26503cd12f91SDan Williams return true; 26513cd12f91SDan Williams 26523cd12f91SDan Williams link_state = portstatus & USB_PORT_STAT_LINK_STATE; 26533cd12f91SDan Williams return link_state == USB_SS_PORT_LS_SS_INACTIVE 26543cd12f91SDan Williams || link_state == USB_SS_PORT_LS_COMP_MOD; 265510d674a8SSarah Sharp } 265610d674a8SSarah Sharp 26571da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 265875d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 26591da177e4SLinus Torvalds { 26601da177e4SLinus Torvalds int delay_time, ret; 26611da177e4SLinus Torvalds u16 portstatus; 26621da177e4SLinus Torvalds u16 portchange; 26631da177e4SLinus Torvalds 26641da177e4SLinus Torvalds for (delay_time = 0; 26651da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 26661da177e4SLinus Torvalds delay_time += delay) { 26671da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 26681da177e4SLinus Torvalds msleep(delay); 26691da177e4SLinus Torvalds 26701da177e4SLinus Torvalds /* read and decode port status */ 26711da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 26721da177e4SLinus Torvalds if (ret < 0) 26731da177e4SLinus Torvalds return ret; 26741da177e4SLinus Torvalds 26754f43447eSSarah Sharp /* The port state is unknown until the reset completes. */ 2676470f0be8SSarah Sharp if (!(portstatus & USB_PORT_STAT_RESET)) 2677470f0be8SSarah Sharp break; 2678470f0be8SSarah Sharp 2679470f0be8SSarah Sharp /* switch to the long delay after two short delay failures */ 2680470f0be8SSarah Sharp if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 2681470f0be8SSarah Sharp delay = HUB_LONG_RESET_TIME; 2682470f0be8SSarah Sharp 2683d99f6b41SDan Williams dev_dbg(&hub->ports[port1 - 1]->dev, 2684d99f6b41SDan Williams "not %sreset yet, waiting %dms\n", 2685d99f6b41SDan Williams warm ? "warm " : "", delay); 2686470f0be8SSarah Sharp } 2687470f0be8SSarah Sharp 26884f43447eSSarah Sharp if ((portstatus & USB_PORT_STAT_RESET)) 2689470f0be8SSarah Sharp return -EBUSY; 26904f43447eSSarah Sharp 26913cd12f91SDan Williams if (hub_port_warm_reset_required(hub, port1, portstatus)) 2692a24a6078SSarah Sharp return -ENOTCONN; 269310d674a8SSarah Sharp 26941da177e4SLinus Torvalds /* Device went away? */ 26951da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 26961da177e4SLinus Torvalds return -ENOTCONN; 26971da177e4SLinus Torvalds 2698a24a6078SSarah Sharp /* bomb out completely if the connection bounced. A USB 3.0 2699a24a6078SSarah Sharp * connection may bounce if multiple warm resets were issued, 2700a24a6078SSarah Sharp * but the device may have successfully re-connected. Ignore it. 2701a24a6078SSarah Sharp */ 2702a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev) && 2703a24a6078SSarah Sharp (portchange & USB_PORT_STAT_C_CONNECTION)) 2704dd4dd19eSAlan Stern return -ENOTCONN; 27051da177e4SLinus Torvalds 2706470f0be8SSarah Sharp if (!(portstatus & USB_PORT_STAT_ENABLE)) 2707470f0be8SSarah Sharp return -EBUSY; 2708470f0be8SSarah Sharp 27092d4fa940SSarah Sharp if (!udev) 27102d4fa940SSarah Sharp return 0; 27112d4fa940SSarah Sharp 27120165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 2713551cdbbeSGreg Kroah-Hartman udev->speed = USB_SPEED_WIRELESS; 2714131dec34SSarah Sharp else if (hub_is_superspeed(hub->hdev)) 2715809cd1cbSSarah Sharp udev->speed = USB_SPEED_SUPER; 27160165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 27171da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 27181da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 27191da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 27201da177e4SLinus Torvalds else 27211da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 27221da177e4SLinus Torvalds return 0; 27231da177e4SLinus Torvalds } 27241da177e4SLinus Torvalds 272575d7cf72SAndiry Xu /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ 272675d7cf72SAndiry Xu static int hub_port_reset(struct usb_hub *hub, int port1, 272775d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 272875d7cf72SAndiry Xu { 272975d7cf72SAndiry Xu int i, status; 2730a24a6078SSarah Sharp u16 portchange, portstatus; 2731d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 273275d7cf72SAndiry Xu 273375d7cf72SAndiry Xu if (!hub_is_superspeed(hub->hdev)) { 27340fe51aa5SSarah Sharp if (warm) { 273575d7cf72SAndiry Xu dev_err(hub->intfdev, "only USB3 hub support " 273675d7cf72SAndiry Xu "warm reset\n"); 273775d7cf72SAndiry Xu return -EINVAL; 273875d7cf72SAndiry Xu } 27390fe51aa5SSarah Sharp /* Block EHCI CF initialization during the port reset. 27400fe51aa5SSarah Sharp * Some companion controllers don't like it when they mix. 27410fe51aa5SSarah Sharp */ 27420fe51aa5SSarah Sharp down_read(&ehci_cf_port_reset_rwsem); 2743d3b9d7a9SSarah Sharp } else if (!warm) { 2744d3b9d7a9SSarah Sharp /* 2745d3b9d7a9SSarah Sharp * If the caller hasn't explicitly requested a warm reset, 2746d3b9d7a9SSarah Sharp * double check and see if one is needed. 2747d3b9d7a9SSarah Sharp */ 2748fb6d1f7dSRobert Schlabbach if (hub_port_status(hub, port1, &portstatus, &portchange) == 0) 2749fb6d1f7dSRobert Schlabbach if (hub_port_warm_reset_required(hub, port1, 2750fb6d1f7dSRobert Schlabbach portstatus)) 2751d3b9d7a9SSarah Sharp warm = true; 275275d7cf72SAndiry Xu } 27533cd12f91SDan Williams clear_bit(port1, hub->warm_reset_bits); 275475d7cf72SAndiry Xu 275575d7cf72SAndiry Xu /* Reset the port */ 275675d7cf72SAndiry Xu for (i = 0; i < PORT_RESET_TRIES; i++) { 275775d7cf72SAndiry Xu status = set_port_feature(hub->hdev, port1, (warm ? 275875d7cf72SAndiry Xu USB_PORT_FEAT_BH_PORT_RESET : 275975d7cf72SAndiry Xu USB_PORT_FEAT_RESET)); 2760e9e88fb7SAlan Stern if (status == -ENODEV) { 2761e9e88fb7SAlan Stern ; /* The hub is gone */ 2762e9e88fb7SAlan Stern } else if (status) { 2763d99f6b41SDan Williams dev_err(&port_dev->dev, 2764d99f6b41SDan Williams "cannot %sreset (err = %d)\n", 2765d99f6b41SDan Williams warm ? "warm " : "", status); 276675d7cf72SAndiry Xu } else { 276775d7cf72SAndiry Xu status = hub_port_wait_reset(hub, port1, udev, delay, 276875d7cf72SAndiry Xu warm); 2769e9e88fb7SAlan Stern if (status && status != -ENOTCONN && status != -ENODEV) 277075d7cf72SAndiry Xu dev_dbg(hub->intfdev, 277175d7cf72SAndiry Xu "port_wait_reset: err = %d\n", 277275d7cf72SAndiry Xu status); 277375d7cf72SAndiry Xu } 277475d7cf72SAndiry Xu 2775a24a6078SSarah Sharp /* Check for disconnect or reset */ 277675d7cf72SAndiry Xu if (status == 0 || status == -ENOTCONN || status == -ENODEV) { 2777fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2778fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_RESET); 2779a24a6078SSarah Sharp 2780a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 278132fe0198SAlan Stern goto done; 2782a24a6078SSarah Sharp 2783fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2784fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_BH_PORT_RESET); 2785fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2786fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_PORT_LINK_STATE); 2787fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2788fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_CONNECTION); 2789fb6d1f7dSRobert Schlabbach 2790a24a6078SSarah Sharp /* 2791a24a6078SSarah Sharp * If a USB 3.0 device migrates from reset to an error 2792a24a6078SSarah Sharp * state, re-issue the warm reset. 2793a24a6078SSarah Sharp */ 2794a24a6078SSarah Sharp if (hub_port_status(hub, port1, 2795a24a6078SSarah Sharp &portstatus, &portchange) < 0) 2796a24a6078SSarah Sharp goto done; 2797a24a6078SSarah Sharp 27983cd12f91SDan Williams if (!hub_port_warm_reset_required(hub, port1, 27993cd12f91SDan Williams portstatus)) 2800a24a6078SSarah Sharp goto done; 2801a24a6078SSarah Sharp 2802a24a6078SSarah Sharp /* 2803a24a6078SSarah Sharp * If the port is in SS.Inactive or Compliance Mode, the 2804a24a6078SSarah Sharp * hot or warm reset failed. Try another warm reset. 2805a24a6078SSarah Sharp */ 2806a24a6078SSarah Sharp if (!warm) { 2807d99f6b41SDan Williams dev_dbg(&port_dev->dev, 2808d99f6b41SDan Williams "hot reset failed, warm reset\n"); 2809a24a6078SSarah Sharp warm = true; 2810a24a6078SSarah Sharp } 28111da177e4SLinus Torvalds } 28121da177e4SLinus Torvalds 2813d99f6b41SDan Williams dev_dbg(&port_dev->dev, 2814d99f6b41SDan Williams "not enabled, trying %sreset again...\n", 2815d99f6b41SDan Williams warm ? "warm " : ""); 28161da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 28171da177e4SLinus Torvalds } 28181da177e4SLinus Torvalds 2819d99f6b41SDan Williams dev_err(&port_dev->dev, "Cannot enable. Maybe the USB cable is bad?\n"); 28201da177e4SLinus Torvalds 282132fe0198SAlan Stern done: 2822fb6d1f7dSRobert Schlabbach if (status == 0) { 2823fb6d1f7dSRobert Schlabbach /* TRSTRCY = 10 ms; plus some extra */ 2824fb6d1f7dSRobert Schlabbach msleep(10 + 40); 2825fb6d1f7dSRobert Schlabbach if (udev) { 2826fb6d1f7dSRobert Schlabbach struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2827fb6d1f7dSRobert Schlabbach 2828fb6d1f7dSRobert Schlabbach update_devnum(udev, 0); 2829fb6d1f7dSRobert Schlabbach /* The xHC may think the device is already reset, 2830fb6d1f7dSRobert Schlabbach * so ignore the status. 2831fb6d1f7dSRobert Schlabbach */ 2832fb6d1f7dSRobert Schlabbach if (hcd->driver->reset_device) 2833fb6d1f7dSRobert Schlabbach hcd->driver->reset_device(hcd, udev); 2834fb6d1f7dSRobert Schlabbach 2835fb6d1f7dSRobert Schlabbach usb_set_device_state(udev, USB_STATE_DEFAULT); 2836fb6d1f7dSRobert Schlabbach } 2837fb6d1f7dSRobert Schlabbach } else { 2838fb6d1f7dSRobert Schlabbach if (udev) 2839fb6d1f7dSRobert Schlabbach usb_set_device_state(udev, USB_STATE_NOTATTACHED); 2840fb6d1f7dSRobert Schlabbach } 2841fb6d1f7dSRobert Schlabbach 28420fe51aa5SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 284332fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 284475d7cf72SAndiry Xu 28451da177e4SLinus Torvalds return status; 28461da177e4SLinus Torvalds } 28471da177e4SLinus Torvalds 28480ed9a57eSAndiry Xu /* Check if a port is power on */ 28490ed9a57eSAndiry Xu static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) 28500ed9a57eSAndiry Xu { 28510ed9a57eSAndiry Xu int ret = 0; 28520ed9a57eSAndiry Xu 28530ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 28540ed9a57eSAndiry Xu if (portstatus & USB_SS_PORT_STAT_POWER) 28550ed9a57eSAndiry Xu ret = 1; 28560ed9a57eSAndiry Xu } else { 28570ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_POWER) 28580ed9a57eSAndiry Xu ret = 1; 28590ed9a57eSAndiry Xu } 28600ed9a57eSAndiry Xu 28610ed9a57eSAndiry Xu return ret; 28620ed9a57eSAndiry Xu } 28630ed9a57eSAndiry Xu 28645c79a1e3SDan Williams static void usb_lock_port(struct usb_port *port_dev) 28655c79a1e3SDan Williams __acquires(&port_dev->status_lock) 28665c79a1e3SDan Williams { 28675c79a1e3SDan Williams mutex_lock(&port_dev->status_lock); 28685c79a1e3SDan Williams __acquire(&port_dev->status_lock); 28695c79a1e3SDan Williams } 28705c79a1e3SDan Williams 28715c79a1e3SDan Williams static void usb_unlock_port(struct usb_port *port_dev) 28725c79a1e3SDan Williams __releases(&port_dev->status_lock) 28735c79a1e3SDan Williams { 28745c79a1e3SDan Williams mutex_unlock(&port_dev->status_lock); 28755c79a1e3SDan Williams __release(&port_dev->status_lock); 28765c79a1e3SDan Williams } 28775c79a1e3SDan Williams 2878d388dab7SAlan Stern #ifdef CONFIG_PM 28791da177e4SLinus Torvalds 28800ed9a57eSAndiry Xu /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ 28810ed9a57eSAndiry Xu static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) 28820ed9a57eSAndiry Xu { 28830ed9a57eSAndiry Xu int ret = 0; 28840ed9a57eSAndiry Xu 28850ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 28860ed9a57eSAndiry Xu if ((portstatus & USB_PORT_STAT_LINK_STATE) 28870ed9a57eSAndiry Xu == USB_SS_PORT_LS_U3) 28880ed9a57eSAndiry Xu ret = 1; 28890ed9a57eSAndiry Xu } else { 28900ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_SUSPEND) 28910ed9a57eSAndiry Xu ret = 1; 28920ed9a57eSAndiry Xu } 28930ed9a57eSAndiry Xu 28940ed9a57eSAndiry Xu return ret; 28950ed9a57eSAndiry Xu } 2896b01b03f3SAlan Stern 2897b01b03f3SAlan Stern /* Determine whether the device on a port is ready for a normal resume, 2898b01b03f3SAlan Stern * is ready for a reset-resume, or should be disconnected. 2899b01b03f3SAlan Stern */ 2900b01b03f3SAlan Stern static int check_port_resume_type(struct usb_device *udev, 2901b01b03f3SAlan Stern struct usb_hub *hub, int port1, 29027fa40910SJulius Werner int status, u16 portchange, u16 portstatus) 2903b01b03f3SAlan Stern { 2904d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 29057fa40910SJulius Werner int retries = 3; 2906d99f6b41SDan Williams 29077fa40910SJulius Werner retry: 29083cd12f91SDan Williams /* Is a warm reset needed to recover the connection? */ 29093cd12f91SDan Williams if (status == 0 && udev->reset_resume 29103cd12f91SDan Williams && hub_port_warm_reset_required(hub, port1, portstatus)) { 29113cd12f91SDan Williams /* pass */; 29123cd12f91SDan Williams } 2913b01b03f3SAlan Stern /* Is the device still present? */ 29143cd12f91SDan Williams else if (status || port_is_suspended(hub, portstatus) || 29157fa40910SJulius Werner !port_is_power_on(hub, portstatus)) { 2916b01b03f3SAlan Stern if (status >= 0) 2917b01b03f3SAlan Stern status = -ENODEV; 29187fa40910SJulius Werner } else if (!(portstatus & USB_PORT_STAT_CONNECTION)) { 29197fa40910SJulius Werner if (retries--) { 29207fa40910SJulius Werner usleep_range(200, 300); 29217fa40910SJulius Werner status = hub_port_status(hub, port1, &portstatus, 29227fa40910SJulius Werner &portchange); 29237fa40910SJulius Werner goto retry; 29247fa40910SJulius Werner } 29257fa40910SJulius Werner status = -ENODEV; 2926b01b03f3SAlan Stern } 2927b01b03f3SAlan Stern 292886c57edfSAlan Stern /* Can't do a normal resume if the port isn't enabled, 292986c57edfSAlan Stern * so try a reset-resume instead. 293086c57edfSAlan Stern */ 293186c57edfSAlan Stern else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { 293286c57edfSAlan Stern if (udev->persist_enabled) 293386c57edfSAlan Stern udev->reset_resume = 1; 293486c57edfSAlan Stern else 2935b01b03f3SAlan Stern status = -ENODEV; 293686c57edfSAlan Stern } 2937b01b03f3SAlan Stern 2938b01b03f3SAlan Stern if (status) { 2939d99f6b41SDan Williams dev_dbg(&port_dev->dev, "status %04x.%04x after resume, %d\n", 2940d99f6b41SDan Williams portchange, portstatus, status); 2941b01b03f3SAlan Stern } else if (udev->reset_resume) { 2942b01b03f3SAlan Stern 2943b01b03f3SAlan Stern /* Late port handoff can set status-change bits */ 2944b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) 2945ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2946b01b03f3SAlan Stern USB_PORT_FEAT_C_CONNECTION); 2947b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) 2948ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2949b01b03f3SAlan Stern USB_PORT_FEAT_C_ENABLE); 2950b01b03f3SAlan Stern } 2951b01b03f3SAlan Stern 2952b01b03f3SAlan Stern return status; 2953b01b03f3SAlan Stern } 2954b01b03f3SAlan Stern 2955f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 2956f74631e3SSarah Sharp { 2957f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2958f74631e3SSarah Sharp 2959f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 2960f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 2961f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 2962f74631e3SSarah Sharp return 0; 2963f74631e3SSarah Sharp 2964f74631e3SSarah Sharp /* Clear Feature LTM Enable can only be sent if the device is 2965f74631e3SSarah Sharp * configured. 2966f74631e3SSarah Sharp */ 2967f74631e3SSarah Sharp if (!udev->actconfig) 2968f74631e3SSarah Sharp return 0; 2969f74631e3SSarah Sharp 2970f74631e3SSarah Sharp return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2971f74631e3SSarah Sharp USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 2972f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 2973f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 2974f74631e3SSarah Sharp } 2975f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 2976f74631e3SSarah Sharp 2977f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) 2978f74631e3SSarah Sharp { 2979f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2980f74631e3SSarah Sharp 2981f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 2982f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 2983f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 2984f74631e3SSarah Sharp return; 2985f74631e3SSarah Sharp 2986f74631e3SSarah Sharp /* Set Feature LTM Enable can only be sent if the device is 2987f74631e3SSarah Sharp * configured. 2988f74631e3SSarah Sharp */ 2989f74631e3SSarah Sharp if (!udev->actconfig) 2990f74631e3SSarah Sharp return; 2991f74631e3SSarah Sharp 2992f74631e3SSarah Sharp usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2993f74631e3SSarah Sharp USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 2994f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 2995f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 2996f74631e3SSarah Sharp } 2997f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 2998f74631e3SSarah Sharp 299954a3ac0cSLan Tianyu /* 300028e86165SAlan Stern * usb_enable_remote_wakeup - enable remote wakeup for a device 300154a3ac0cSLan Tianyu * @udev: target device 300254a3ac0cSLan Tianyu * 300328e86165SAlan Stern * For USB-2 devices: Set the device's remote wakeup feature. 300428e86165SAlan Stern * 300528e86165SAlan Stern * For USB-3 devices: Assume there's only one function on the device and 300628e86165SAlan Stern * enable remote wake for the first interface. FIXME if the interface 300728e86165SAlan Stern * association descriptor shows there's more than one function. 300854a3ac0cSLan Tianyu */ 300928e86165SAlan Stern static int usb_enable_remote_wakeup(struct usb_device *udev) 301054a3ac0cSLan Tianyu { 301128e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) 301228e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 301328e86165SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 301428e86165SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, 301528e86165SAlan Stern USB_CTRL_SET_TIMEOUT); 301628e86165SAlan Stern else 301728e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 301828e86165SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, 301928e86165SAlan Stern USB_INTRF_FUNC_SUSPEND, 302028e86165SAlan Stern USB_INTRF_FUNC_SUSPEND_RW | 302128e86165SAlan Stern USB_INTRF_FUNC_SUSPEND_LP, 302228e86165SAlan Stern NULL, 0, USB_CTRL_SET_TIMEOUT); 302328e86165SAlan Stern } 302428e86165SAlan Stern 302528e86165SAlan Stern /* 302628e86165SAlan Stern * usb_disable_remote_wakeup - disable remote wakeup for a device 302728e86165SAlan Stern * @udev: target device 302828e86165SAlan Stern * 302928e86165SAlan Stern * For USB-2 devices: Clear the device's remote wakeup feature. 303028e86165SAlan Stern * 303128e86165SAlan Stern * For USB-3 devices: Assume there's only one function on the device and 303228e86165SAlan Stern * disable remote wake for the first interface. FIXME if the interface 303328e86165SAlan Stern * association descriptor shows there's more than one function. 303428e86165SAlan Stern */ 303528e86165SAlan Stern static int usb_disable_remote_wakeup(struct usb_device *udev) 303628e86165SAlan Stern { 303728e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) 303828e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 303928e86165SAlan Stern USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 304028e86165SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, 304128e86165SAlan Stern USB_CTRL_SET_TIMEOUT); 304228e86165SAlan Stern else 304354a3ac0cSLan Tianyu return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 304454a3ac0cSLan Tianyu USB_REQ_CLEAR_FEATURE, USB_RECIP_INTERFACE, 304554a3ac0cSLan Tianyu USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, 304654a3ac0cSLan Tianyu USB_CTRL_SET_TIMEOUT); 304754a3ac0cSLan Tianyu } 30481da177e4SLinus Torvalds 3049e583d9dbSAlan Stern /* Count of wakeup-enabled devices at or below udev */ 3050e583d9dbSAlan Stern static unsigned wakeup_enabled_descendants(struct usb_device *udev) 3051e583d9dbSAlan Stern { 3052e583d9dbSAlan Stern struct usb_hub *hub = usb_hub_to_struct_hub(udev); 3053e583d9dbSAlan Stern 3054e583d9dbSAlan Stern return udev->do_remote_wakeup + 3055e583d9dbSAlan Stern (hub ? hub->wakeup_enabled_descendants : 0); 3056e583d9dbSAlan Stern } 3057e583d9dbSAlan Stern 30581da177e4SLinus Torvalds /* 3059140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 3060624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 30615edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 30621da177e4SLinus Torvalds * 30631da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 30641da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 30651da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 3066140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 30671da177e4SLinus Torvalds * to disconnect devices while they are suspended. 30681da177e4SLinus Torvalds * 3069390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 3070390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 3071390a8c34SDavid Brownell * 3072624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 3073624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 3074624d6c07SAlan Stern * All devices below the suspended port are also suspended. 3075624d6c07SAlan Stern * 3076624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 3077624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 3078624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 3079624d6c07SAlan Stern * some cases, this wakes the USB host. 3080624d6c07SAlan Stern * 30811da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 30821da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 30831da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 30841da177e4SLinus Torvalds * 30854956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 30864956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 30874956eccdSAlan Stern * State transitions include: 30884956eccdSAlan Stern * 30894956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 30904956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 30914956eccdSAlan Stern * 30924956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 30934956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 30944956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 309537ebb549SPetr Mladek * Linux (2.6) currently has NO mechanisms to initiate that: no hub_wq 30964956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 30974956eccdSAlan Stern * 3098e583d9dbSAlan Stern * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get 3099e583d9dbSAlan Stern * suspended until their bus goes into global suspend (i.e., the root 31000aa2832dSAlan Stern * hub is suspended). Nevertheless, we change @udev->state to 31010aa2832dSAlan Stern * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual 31020aa2832dSAlan Stern * upstream port setting is stored in @udev->port_is_suspended. 31034956eccdSAlan Stern * 31041da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 31051da177e4SLinus Torvalds */ 310665bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 31071da177e4SLinus Torvalds { 3108ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 3109ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 3110624d6c07SAlan Stern int port1 = udev->portnum; 3111624d6c07SAlan Stern int status; 31120aa2832dSAlan Stern bool really_suspend = true; 31134956eccdSAlan Stern 31145c79a1e3SDan Williams usb_lock_port(port_dev); 31155c79a1e3SDan Williams 3116624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 3117624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 3118624d6c07SAlan Stern * 3119624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 3120624d6c07SAlan Stern * we don't explicitly enable it here. 3121624d6c07SAlan Stern */ 3122624d6c07SAlan Stern if (udev->do_remote_wakeup) { 312328e86165SAlan Stern status = usb_enable_remote_wakeup(udev); 31240c487206SOliver Neukum if (status) { 3125624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 3126624d6c07SAlan Stern status); 31270c487206SOliver Neukum /* bail if autosuspend is requested */ 31285b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 31294fae6f0fSAlan Stern goto err_wakeup; 31300c487206SOliver Neukum } 3131624d6c07SAlan Stern } 3132624d6c07SAlan Stern 313365580b43SAndiry Xu /* disable USB2 hardware LPM */ 313465580b43SAndiry Xu if (udev->usb2_hw_lpm_enabled == 1) 313565580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 0); 313665580b43SAndiry Xu 3137f74631e3SSarah Sharp if (usb_disable_ltm(udev)) { 31384fae6f0fSAlan Stern dev_err(&udev->dev, "Failed to disable LTM before suspend\n."); 31394fae6f0fSAlan Stern status = -ENOMEM; 31404fae6f0fSAlan Stern if (PMSG_IS_AUTO(msg)) 31414fae6f0fSAlan Stern goto err_ltm; 3142f74631e3SSarah Sharp } 31438306095fSSarah Sharp if (usb_unlocked_disable_lpm(udev)) { 31444fae6f0fSAlan Stern dev_err(&udev->dev, "Failed to disable LPM before suspend\n."); 31454fae6f0fSAlan Stern status = -ENOMEM; 31464fae6f0fSAlan Stern if (PMSG_IS_AUTO(msg)) 31474fae6f0fSAlan Stern goto err_lpm3; 31488306095fSSarah Sharp } 31498306095fSSarah Sharp 3150624d6c07SAlan Stern /* see 7.1.7.6 */ 3151a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3152c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); 3153e583d9dbSAlan Stern 31540aa2832dSAlan Stern /* 31550aa2832dSAlan Stern * For system suspend, we do not need to enable the suspend feature 31560aa2832dSAlan Stern * on individual USB-2 ports. The devices will automatically go 31570aa2832dSAlan Stern * into suspend a few ms after the root hub stops sending packets. 31580aa2832dSAlan Stern * The USB 2.0 spec calls this "global suspend". 3159e583d9dbSAlan Stern * 3160e583d9dbSAlan Stern * However, many USB hubs have a bug: They don't relay wakeup requests 3161e583d9dbSAlan Stern * from a downstream port if the port's suspend feature isn't on. 3162e583d9dbSAlan Stern * Therefore we will turn on the suspend feature if udev or any of its 3163e583d9dbSAlan Stern * descendants is enabled for remote wakeup. 31640aa2832dSAlan Stern */ 3165e583d9dbSAlan Stern else if (PMSG_IS_AUTO(msg) || wakeup_enabled_descendants(udev) > 0) 3166e583d9dbSAlan Stern status = set_port_feature(hub->hdev, port1, 3167e583d9dbSAlan Stern USB_PORT_FEAT_SUSPEND); 31680aa2832dSAlan Stern else { 31690aa2832dSAlan Stern really_suspend = false; 31700aa2832dSAlan Stern status = 0; 31710aa2832dSAlan Stern } 3172624d6c07SAlan Stern if (status) { 3173d99f6b41SDan Williams dev_dbg(&port_dev->dev, "can't suspend, status %d\n", status); 3174cbb33004SAlan Stern 31754fae6f0fSAlan Stern /* Try to enable USB3 LPM and LTM again */ 31764fae6f0fSAlan Stern usb_unlocked_enable_lpm(udev); 31774fae6f0fSAlan Stern err_lpm3: 31784fae6f0fSAlan Stern usb_enable_ltm(udev); 31794fae6f0fSAlan Stern err_ltm: 3180c3e751e4SAndiry Xu /* Try to enable USB2 hardware LPM again */ 3181c3e751e4SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 3182c3e751e4SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 3183c3e751e4SAndiry Xu 31844fae6f0fSAlan Stern if (udev->do_remote_wakeup) 31854fae6f0fSAlan Stern (void) usb_disable_remote_wakeup(udev); 31864fae6f0fSAlan Stern err_wakeup: 31878306095fSSarah Sharp 3188cbb33004SAlan Stern /* System sleep transitions should never fail */ 31895b1b0b81SAlan Stern if (!PMSG_IS_AUTO(msg)) 3190cbb33004SAlan Stern status = 0; 3191624d6c07SAlan Stern } else { 319230b1a7a3SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", 319330b1a7a3SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : ""), 319430b1a7a3SAlan Stern udev->do_remote_wakeup); 31950aa2832dSAlan Stern if (really_suspend) { 3196bfd1e910SAlan Stern udev->port_is_suspended = 1; 3197e583d9dbSAlan Stern 3198e583d9dbSAlan Stern /* device has up to 10 msec to fully suspend */ 3199624d6c07SAlan Stern msleep(10); 3200624d6c07SAlan Stern } 3201e583d9dbSAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 32020aa2832dSAlan Stern } 3203ad493e5eSLan Tianyu 3204d5c3834eSDan Williams if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled 3205d5c3834eSDan Williams && test_and_clear_bit(port1, hub->child_usage_bits)) 3206ad493e5eSLan Tianyu pm_runtime_put_sync(&port_dev->dev); 3207ad493e5eSLan Tianyu 3208c08512c7SAlan Stern usb_mark_last_busy(hub->hdev); 32095c79a1e3SDan Williams 32105c79a1e3SDan Williams usb_unlock_port(port_dev); 32114956eccdSAlan Stern return status; 32121da177e4SLinus Torvalds } 3213f3f3253dSDavid Brownell 32141da177e4SLinus Torvalds /* 3215390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 3216390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 321754515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 32181da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 32191da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 32201da177e4SLinus Torvalds * in the tree that's rooted at this device. 322154515fe5SAlan Stern * 322254515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 322354515fe5SAlan Stern * status check is done. 32241da177e4SLinus Torvalds */ 3225140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 32261da177e4SLinus Torvalds { 322754515fe5SAlan Stern int status = 0; 322807e72b95SOliver Neukum u16 devstatus = 0; 32291da177e4SLinus Torvalds 32301da177e4SLinus Torvalds /* caller owns the udev device lock */ 3231b9cef6c3SWu Fengguang dev_dbg(&udev->dev, "%s\n", 3232b9cef6c3SWu Fengguang udev->reset_resume ? "finish reset-resume" : "finish resume"); 32331da177e4SLinus Torvalds 32341da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 32351da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 32361da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 323737ebb549SPetr Mladek * during many timeouts, but hub_wq can't suspend until later. 32381da177e4SLinus Torvalds */ 32391da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 32401da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 32411da177e4SLinus Torvalds : USB_STATE_ADDRESS); 32421da177e4SLinus Torvalds 324354515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 324454515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 324554515fe5SAlan Stern * operation is carried out here, after the port has been 324654515fe5SAlan Stern * resumed. 324754515fe5SAlan Stern */ 32481d10255cSAlan Stern if (udev->reset_resume) { 32491d10255cSAlan Stern /* 32501d10255cSAlan Stern * If the device morphs or switches modes when it is reset, 32511d10255cSAlan Stern * we don't want to perform a reset-resume. We'll fail the 32521d10255cSAlan Stern * resume, which will cause a logical disconnect, and then 32531d10255cSAlan Stern * the device will be rediscovered. 32541d10255cSAlan Stern */ 325586c57edfSAlan Stern retry_reset_resume: 32561d10255cSAlan Stern if (udev->quirks & USB_QUIRK_RESET) 32571d10255cSAlan Stern status = -ENODEV; 32581d10255cSAlan Stern else 3259742120c6SMing Lei status = usb_reset_and_verify_device(udev); 32601d10255cSAlan Stern } 326154515fe5SAlan Stern 32621da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 32631da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 32641da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 32651da177e4SLinus Torvalds */ 326654515fe5SAlan Stern if (status == 0) { 326746dede46SAlan Stern devstatus = 0; 32681da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 326986c57edfSAlan Stern 327086c57edfSAlan Stern /* If a normal resume failed, try doing a reset-resume */ 327186c57edfSAlan Stern if (status && !udev->reset_resume && udev->persist_enabled) { 327286c57edfSAlan Stern dev_dbg(&udev->dev, "retry with reset-resume\n"); 327386c57edfSAlan Stern udev->reset_resume = 1; 327486c57edfSAlan Stern goto retry_reset_resume; 327586c57edfSAlan Stern } 327654515fe5SAlan Stern } 3277b40b7a90SAlan Stern 3278624d6c07SAlan Stern if (status) { 3279624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 32801da177e4SLinus Torvalds status); 328107e72b95SOliver Neukum /* 328207e72b95SOliver Neukum * There are a few quirky devices which violate the standard 328307e72b95SOliver Neukum * by claiming to have remote wakeup enabled after a reset, 328407e72b95SOliver Neukum * which crash if the feature is cleared, hence check for 328507e72b95SOliver Neukum * udev->reset_resume 328607e72b95SOliver Neukum */ 328707e72b95SOliver Neukum } else if (udev->actconfig && !udev->reset_resume) { 328828e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) { 328954a3ac0cSLan Tianyu if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) 329028e86165SAlan Stern status = usb_disable_remote_wakeup(udev); 329154a3ac0cSLan Tianyu } else { 329254a3ac0cSLan Tianyu status = usb_get_status(udev, USB_RECIP_INTERFACE, 0, 329354a3ac0cSLan Tianyu &devstatus); 329454a3ac0cSLan Tianyu if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP 329554a3ac0cSLan Tianyu | USB_INTRF_STAT_FUNC_RW)) 329628e86165SAlan Stern status = usb_disable_remote_wakeup(udev); 329754a3ac0cSLan Tianyu } 329854a3ac0cSLan Tianyu 3299a8e7c565SAlan Stern if (status) 3300b9cef6c3SWu Fengguang dev_dbg(&udev->dev, 3301b9cef6c3SWu Fengguang "disable remote wakeup, status %d\n", 3302b9cef6c3SWu Fengguang status); 33031da177e4SLinus Torvalds status = 0; 33041da177e4SLinus Torvalds } 33051da177e4SLinus Torvalds return status; 33061da177e4SLinus Torvalds } 33071da177e4SLinus Torvalds 3308624d6c07SAlan Stern /* 3309a40178b2SPratyush Anand * There are some SS USB devices which take longer time for link training. 3310a40178b2SPratyush Anand * XHCI specs 4.19.4 says that when Link training is successful, port 3311a40178b2SPratyush Anand * sets CSC bit to 1. So if SW reads port status before successful link 3312a40178b2SPratyush Anand * training, then it will not find device to be present. 3313a40178b2SPratyush Anand * USB Analyzer log with such buggy devices show that in some cases 3314a40178b2SPratyush Anand * device switch on the RX termination after long delay of host enabling 3315a40178b2SPratyush Anand * the VBUS. In few other cases it has been seen that device fails to 3316a40178b2SPratyush Anand * negotiate link training in first attempt. It has been 3317a40178b2SPratyush Anand * reported till now that few devices take as long as 2000 ms to train 3318a40178b2SPratyush Anand * the link after host enabling its VBUS and termination. Following 3319a40178b2SPratyush Anand * routine implements a 2000 ms timeout for link training. If in a case 3320a40178b2SPratyush Anand * link trains before timeout, loop will exit earlier. 3321a40178b2SPratyush Anand * 3322a40178b2SPratyush Anand * FIXME: If a device was connected before suspend, but was removed 3323a40178b2SPratyush Anand * while system was asleep, then the loop in the following routine will 3324a40178b2SPratyush Anand * only exit at timeout. 3325a40178b2SPratyush Anand * 3326a40178b2SPratyush Anand * This routine should only be called when persist is enabled for a SS 3327a40178b2SPratyush Anand * device. 3328a40178b2SPratyush Anand */ 3329a40178b2SPratyush Anand static int wait_for_ss_port_enable(struct usb_device *udev, 3330a40178b2SPratyush Anand struct usb_hub *hub, int *port1, 3331a40178b2SPratyush Anand u16 *portchange, u16 *portstatus) 3332a40178b2SPratyush Anand { 3333a40178b2SPratyush Anand int status = 0, delay_ms = 0; 3334a40178b2SPratyush Anand 3335a40178b2SPratyush Anand while (delay_ms < 2000) { 3336a40178b2SPratyush Anand if (status || *portstatus & USB_PORT_STAT_CONNECTION) 3337a40178b2SPratyush Anand break; 3338a40178b2SPratyush Anand msleep(20); 3339a40178b2SPratyush Anand delay_ms += 20; 3340a40178b2SPratyush Anand status = hub_port_status(hub, *port1, portstatus, portchange); 3341a40178b2SPratyush Anand } 3342a40178b2SPratyush Anand return status; 3343a40178b2SPratyush Anand } 3344a40178b2SPratyush Anand 3345a40178b2SPratyush Anand /* 3346624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 3347624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 3348624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 3349624d6c07SAlan Stern * 3350624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 3351624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 3352624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 3353624d6c07SAlan Stern * the host and the device is the same as it was when the device 3354624d6c07SAlan Stern * suspended. 3355624d6c07SAlan Stern * 3356feccc30dSAlan Stern * If @udev->reset_resume is set then this routine won't check that the 3357feccc30dSAlan Stern * port is still enabled. Furthermore, finish_port_resume() above will 335854515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 335954515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 336054515fe5SAlan Stern * 336154515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 336254515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 336354515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 336454515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 336554515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 336654515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 336754515fe5SAlan Stern * made to appear as if it had not disconnected. 336854515fe5SAlan Stern * 3369742120c6SMing Lei * This facility can be dangerous. Although usb_reset_and_verify_device() makes 3370feccc30dSAlan Stern * every effort to insure that the same device is present after the 337154515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 337254515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 337354515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 337454515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 337554515fe5SAlan Stern * new card is corrupted and the system crashes. 337654515fe5SAlan Stern * 3377624d6c07SAlan Stern * Returns 0 on success, else negative errno. 3378624d6c07SAlan Stern */ 337965bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 33801da177e4SLinus Torvalds { 3381ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 3382ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 3383624d6c07SAlan Stern int port1 = udev->portnum; 33841da177e4SLinus Torvalds int status; 3385d25450c6SAlan Stern u16 portchange, portstatus; 3386d25450c6SAlan Stern 3387d5c3834eSDan Williams if (!test_and_set_bit(port1, hub->child_usage_bits)) { 3388ad493e5eSLan Tianyu status = pm_runtime_get_sync(&port_dev->dev); 3389ad493e5eSLan Tianyu if (status < 0) { 3390ad493e5eSLan Tianyu dev_dbg(&udev->dev, "can't resume usb port, status %d\n", 3391ad493e5eSLan Tianyu status); 3392ad493e5eSLan Tianyu return status; 3393ad493e5eSLan Tianyu } 3394ad493e5eSLan Tianyu } 3395ad493e5eSLan Tianyu 33965c79a1e3SDan Williams usb_lock_port(port_dev); 33975c79a1e3SDan Williams 3398d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 3399d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 34000ed9a57eSAndiry Xu if (status == 0 && !port_is_suspended(hub, portstatus)) 3401d25450c6SAlan Stern goto SuspendCleared; 34021da177e4SLinus Torvalds 34031da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 3404a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3405c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); 3406a7114230SAndiry Xu else 3407ad493e5eSLan Tianyu status = usb_clear_port_feature(hub->hdev, 34081da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 34091da177e4SLinus Torvalds if (status) { 3410d99f6b41SDan Williams dev_dbg(&port_dev->dev, "can't resume, status %d\n", status); 34111da177e4SLinus Torvalds } else { 3412bbc78c07SFelipe Balbi /* drive resume for USB_RESUME_TIMEOUT msec */ 3413645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 34145b1b0b81SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : "")); 3415bbc78c07SFelipe Balbi msleep(USB_RESUME_TIMEOUT); 34161da177e4SLinus Torvalds 34171da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 34181da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 34191da177e4SLinus Torvalds * sequence. 34201da177e4SLinus Torvalds */ 3421d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 342254515fe5SAlan Stern 34231da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 34241da177e4SLinus Torvalds msleep(10); 34251da177e4SLinus Torvalds } 3426b01b03f3SAlan Stern 3427b01b03f3SAlan Stern SuspendCleared: 3428b01b03f3SAlan Stern if (status == 0) { 3429bfd1e910SAlan Stern udev->port_is_suspended = 0; 3430a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) { 3431a7114230SAndiry Xu if (portchange & USB_PORT_STAT_C_LINK_STATE) 3432ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3433a7114230SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 3434a7114230SAndiry Xu } else { 3435b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 3436ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3437b01b03f3SAlan Stern USB_PORT_FEAT_C_SUSPEND); 34381da177e4SLinus Torvalds } 3439a7114230SAndiry Xu } 34401da177e4SLinus Torvalds 3441a40178b2SPratyush Anand if (udev->persist_enabled && hub_is_superspeed(hub->hdev)) 3442a40178b2SPratyush Anand status = wait_for_ss_port_enable(udev, hub, &port1, &portchange, 3443a40178b2SPratyush Anand &portstatus); 3444a40178b2SPratyush Anand 3445b01b03f3SAlan Stern status = check_port_resume_type(udev, 3446b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 344754515fe5SAlan Stern if (status == 0) 344854515fe5SAlan Stern status = finish_port_resume(udev); 344954515fe5SAlan Stern if (status < 0) { 345054515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 345154515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 345265580b43SAndiry Xu } else { 345365580b43SAndiry Xu /* Try to enable USB2 hardware LPM */ 345465580b43SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 345565580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 34568306095fSSarah Sharp 3457f74631e3SSarah Sharp /* Try to enable USB3 LTM and LPM */ 3458f74631e3SSarah Sharp usb_enable_ltm(udev); 34598306095fSSarah Sharp usb_unlocked_enable_lpm(udev); 346054515fe5SAlan Stern } 346165580b43SAndiry Xu 34625c79a1e3SDan Williams usb_unlock_port(port_dev); 34635c79a1e3SDan Williams 34641da177e4SLinus Torvalds return status; 34651da177e4SLinus Torvalds } 34661da177e4SLinus Torvalds 34670534d468SAlan Stern int usb_remote_wakeup(struct usb_device *udev) 34681da177e4SLinus Torvalds { 34691da177e4SLinus Torvalds int status = 0; 34701da177e4SLinus Torvalds 34715c79a1e3SDan Williams usb_lock_device(udev); 34721da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 3473645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 34749bbdf1e0SAlan Stern status = usb_autoresume_device(udev); 34759bbdf1e0SAlan Stern if (status == 0) { 34769bbdf1e0SAlan Stern /* Let the drivers do their thing, then... */ 34779bbdf1e0SAlan Stern usb_autosuspend_device(udev); 34789bbdf1e0SAlan Stern } 3479d25450c6SAlan Stern } 34805c79a1e3SDan Williams usb_unlock_device(udev); 34811da177e4SLinus Torvalds return status; 34821da177e4SLinus Torvalds } 34831da177e4SLinus Torvalds 34847e73be22SDan Williams /* Returns 1 if there was a remote wakeup and a connect status change. */ 34857e73be22SDan Williams static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, 34867e73be22SDan Williams u16 portstatus, u16 portchange) 34877e73be22SDan Williams __must_hold(&port_dev->status_lock) 34887e73be22SDan Williams { 34897e73be22SDan Williams struct usb_port *port_dev = hub->ports[port - 1]; 34907e73be22SDan Williams struct usb_device *hdev; 34917e73be22SDan Williams struct usb_device *udev; 34927e73be22SDan Williams int connect_change = 0; 34937e73be22SDan Williams int ret; 34947e73be22SDan Williams 34957e73be22SDan Williams hdev = hub->hdev; 34967e73be22SDan Williams udev = port_dev->child; 34977e73be22SDan Williams if (!hub_is_superspeed(hdev)) { 34987e73be22SDan Williams if (!(portchange & USB_PORT_STAT_C_SUSPEND)) 34997e73be22SDan Williams return 0; 35007e73be22SDan Williams usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); 35017e73be22SDan Williams } else { 35027e73be22SDan Williams if (!udev || udev->state != USB_STATE_SUSPENDED || 35037e73be22SDan Williams (portstatus & USB_PORT_STAT_LINK_STATE) != 35047e73be22SDan Williams USB_SS_PORT_LS_U0) 35057e73be22SDan Williams return 0; 35067e73be22SDan Williams } 35077e73be22SDan Williams 35087e73be22SDan Williams if (udev) { 35097e73be22SDan Williams /* TRSMRCY = 10 msec */ 35107e73be22SDan Williams msleep(10); 35117e73be22SDan Williams 35127e73be22SDan Williams usb_unlock_port(port_dev); 35137e73be22SDan Williams ret = usb_remote_wakeup(udev); 35147e73be22SDan Williams usb_lock_port(port_dev); 35157e73be22SDan Williams if (ret < 0) 35167e73be22SDan Williams connect_change = 1; 35177e73be22SDan Williams } else { 35187e73be22SDan Williams ret = -ENODEV; 35197e73be22SDan Williams hub_port_disable(hub, port, 1); 35207e73be22SDan Williams } 35217e73be22SDan Williams dev_dbg(&port_dev->dev, "resume, status %d\n", ret); 35227e73be22SDan Williams return connect_change; 35237e73be22SDan Williams } 35247e73be22SDan Williams 3525e6f30deaSMing Lei static int check_ports_changed(struct usb_hub *hub) 3526e6f30deaSMing Lei { 3527e6f30deaSMing Lei int port1; 3528e6f30deaSMing Lei 3529e6f30deaSMing Lei for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { 3530e6f30deaSMing Lei u16 portstatus, portchange; 3531e6f30deaSMing Lei int status; 3532e6f30deaSMing Lei 3533e6f30deaSMing Lei status = hub_port_status(hub, port1, &portstatus, &portchange); 3534e6f30deaSMing Lei if (!status && portchange) 3535e6f30deaSMing Lei return 1; 3536e6f30deaSMing Lei } 3537e6f30deaSMing Lei return 0; 3538e6f30deaSMing Lei } 3539e6f30deaSMing Lei 3540db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 35411da177e4SLinus Torvalds { 35421da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 35431da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 35441da177e4SLinus Torvalds unsigned port1; 35454296c70aSSarah Sharp int status; 35461da177e4SLinus Torvalds 3547e583d9dbSAlan Stern /* 3548e583d9dbSAlan Stern * Warn if children aren't already suspended. 3549e583d9dbSAlan Stern * Also, add up the number of wakeup-enabled descendants. 3550e583d9dbSAlan Stern */ 3551e583d9dbSAlan Stern hub->wakeup_enabled_descendants = 0; 35521da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 3553d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 3554d99f6b41SDan Williams struct usb_device *udev = port_dev->child; 35551da177e4SLinus Torvalds 35566840d255SAlan Stern if (udev && udev->can_submit) { 3557b658b8f5SDan Williams dev_warn(&port_dev->dev, "device %s not suspended yet\n", 3558b658b8f5SDan Williams dev_name(&udev->dev)); 35595b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 3560c9f89fa4SDavid Brownell return -EBUSY; 3561c9f89fa4SDavid Brownell } 3562e583d9dbSAlan Stern if (udev) 3563e583d9dbSAlan Stern hub->wakeup_enabled_descendants += 3564e583d9dbSAlan Stern wakeup_enabled_descendants(udev); 35651da177e4SLinus Torvalds } 3566e6f30deaSMing Lei 3567e6f30deaSMing Lei if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { 3568e6f30deaSMing Lei /* check if there are changes pending on hub ports */ 3569e6f30deaSMing Lei if (check_ports_changed(hub)) { 3570e6f30deaSMing Lei if (PMSG_IS_AUTO(msg)) 3571e6f30deaSMing Lei return -EBUSY; 3572e6f30deaSMing Lei pm_wakeup_event(&hdev->dev, 2000); 3573e6f30deaSMing Lei } 3574e6f30deaSMing Lei } 3575e6f30deaSMing Lei 35764296c70aSSarah Sharp if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { 35774296c70aSSarah Sharp /* Enable hub to send remote wakeup for all ports. */ 35784296c70aSSarah Sharp for (port1 = 1; port1 <= hdev->maxchild; port1++) { 35794296c70aSSarah Sharp status = set_port_feature(hdev, 35804296c70aSSarah Sharp port1 | 35814296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_CONNECT | 35824296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | 35834296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, 35844296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_MASK); 35854296c70aSSarah Sharp } 35864296c70aSSarah Sharp } 35871da177e4SLinus Torvalds 3588441b62c1SHarvey Harrison dev_dbg(&intf->dev, "%s\n", __func__); 358940f122f3SAlan Stern 359037ebb549SPetr Mladek /* stop hub_wq and related activity */ 35914330354fSAlan Stern hub_quiesce(hub, HUB_SUSPEND); 3592b6f6436dSAlan Stern return 0; 35931da177e4SLinus Torvalds } 35941da177e4SLinus Torvalds 35951da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 35961da177e4SLinus Torvalds { 35971da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 35981da177e4SLinus Torvalds 35995e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3600f2835219SAlan Stern hub_activate(hub, HUB_RESUME); 36011da177e4SLinus Torvalds return 0; 36021da177e4SLinus Torvalds } 36031da177e4SLinus Torvalds 3604b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 3605f07600cfSAlan Stern { 3606b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 3607f07600cfSAlan Stern 36085e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3609f2835219SAlan Stern hub_activate(hub, HUB_RESET_RESUME); 3610f07600cfSAlan Stern return 0; 3611f07600cfSAlan Stern } 3612f07600cfSAlan Stern 361354515fe5SAlan Stern /** 361454515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 361554515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 361654515fe5SAlan Stern * 361754515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 361854515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 3619feccc30dSAlan Stern * has been reset. The routine marks @rhdev as having lost power. 3620feccc30dSAlan Stern * When the hub driver is resumed it will take notice and carry out 3621feccc30dSAlan Stern * power-session recovery for all the "USB-PERSIST"-enabled child devices; 3622feccc30dSAlan Stern * the others will be disconnected. 362354515fe5SAlan Stern */ 362454515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 362554515fe5SAlan Stern { 362654515fe5SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 362754515fe5SAlan Stern rhdev->reset_resume = 1; 362854515fe5SAlan Stern } 362954515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 363054515fe5SAlan Stern 36311ea7e0e8SSarah Sharp static const char * const usb3_lpm_names[] = { 36321ea7e0e8SSarah Sharp "U0", 36331ea7e0e8SSarah Sharp "U1", 36341ea7e0e8SSarah Sharp "U2", 36351ea7e0e8SSarah Sharp "U3", 36361ea7e0e8SSarah Sharp }; 36371ea7e0e8SSarah Sharp 36381ea7e0e8SSarah Sharp /* 36391ea7e0e8SSarah Sharp * Send a Set SEL control transfer to the device, prior to enabling 36401ea7e0e8SSarah Sharp * device-initiated U1 or U2. This lets the device know the exit latencies from 36411ea7e0e8SSarah Sharp * the time the device initiates a U1 or U2 exit, to the time it will receive a 36421ea7e0e8SSarah Sharp * packet from the host. 36431ea7e0e8SSarah Sharp * 36441ea7e0e8SSarah Sharp * This function will fail if the SEL or PEL values for udev are greater than 36451ea7e0e8SSarah Sharp * the maximum allowed values for the link state to be enabled. 36461ea7e0e8SSarah Sharp */ 36471ea7e0e8SSarah Sharp static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) 36481ea7e0e8SSarah Sharp { 36491ea7e0e8SSarah Sharp struct usb_set_sel_req *sel_values; 36501ea7e0e8SSarah Sharp unsigned long long u1_sel; 36511ea7e0e8SSarah Sharp unsigned long long u1_pel; 36521ea7e0e8SSarah Sharp unsigned long long u2_sel; 36531ea7e0e8SSarah Sharp unsigned long long u2_pel; 36541ea7e0e8SSarah Sharp int ret; 36551ea7e0e8SSarah Sharp 365638d7f688SXenia Ragiadakou if (udev->state != USB_STATE_CONFIGURED) 365738d7f688SXenia Ragiadakou return 0; 365838d7f688SXenia Ragiadakou 36591ea7e0e8SSarah Sharp /* Convert SEL and PEL stored in ns to us */ 36601ea7e0e8SSarah Sharp u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); 36611ea7e0e8SSarah Sharp u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); 36621ea7e0e8SSarah Sharp u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); 36631ea7e0e8SSarah Sharp u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); 36641ea7e0e8SSarah Sharp 36651ea7e0e8SSarah Sharp /* 36661ea7e0e8SSarah Sharp * Make sure that the calculated SEL and PEL values for the link 36671ea7e0e8SSarah Sharp * state we're enabling aren't bigger than the max SEL/PEL 36681ea7e0e8SSarah Sharp * value that will fit in the SET SEL control transfer. 36691ea7e0e8SSarah Sharp * Otherwise the device would get an incorrect idea of the exit 36701ea7e0e8SSarah Sharp * latency for the link state, and could start a device-initiated 36711ea7e0e8SSarah Sharp * U1/U2 when the exit latencies are too high. 36721ea7e0e8SSarah Sharp */ 36731ea7e0e8SSarah Sharp if ((state == USB3_LPM_U1 && 36741ea7e0e8SSarah Sharp (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || 36751ea7e0e8SSarah Sharp u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || 36761ea7e0e8SSarah Sharp (state == USB3_LPM_U2 && 36771ea7e0e8SSarah Sharp (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || 36781ea7e0e8SSarah Sharp u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { 36791510a1a2SSarah Sharp dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", 36801ea7e0e8SSarah Sharp usb3_lpm_names[state], u1_sel, u1_pel); 36811ea7e0e8SSarah Sharp return -EINVAL; 36821ea7e0e8SSarah Sharp } 36831ea7e0e8SSarah Sharp 36841ea7e0e8SSarah Sharp /* 36851ea7e0e8SSarah Sharp * If we're enabling device-initiated LPM for one link state, 36861ea7e0e8SSarah Sharp * but the other link state has a too high SEL or PEL value, 36871ea7e0e8SSarah Sharp * just set those values to the max in the Set SEL request. 36881ea7e0e8SSarah Sharp */ 36891ea7e0e8SSarah Sharp if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) 36901ea7e0e8SSarah Sharp u1_sel = USB3_LPM_MAX_U1_SEL_PEL; 36911ea7e0e8SSarah Sharp 36921ea7e0e8SSarah Sharp if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) 36931ea7e0e8SSarah Sharp u1_pel = USB3_LPM_MAX_U1_SEL_PEL; 36941ea7e0e8SSarah Sharp 36951ea7e0e8SSarah Sharp if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) 36961ea7e0e8SSarah Sharp u2_sel = USB3_LPM_MAX_U2_SEL_PEL; 36971ea7e0e8SSarah Sharp 36981ea7e0e8SSarah Sharp if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) 36991ea7e0e8SSarah Sharp u2_pel = USB3_LPM_MAX_U2_SEL_PEL; 37001ea7e0e8SSarah Sharp 37011ea7e0e8SSarah Sharp /* 37021ea7e0e8SSarah Sharp * usb_enable_lpm() can be called as part of a failed device reset, 37031ea7e0e8SSarah Sharp * which may be initiated by an error path of a mass storage driver. 37041ea7e0e8SSarah Sharp * Therefore, use GFP_NOIO. 37051ea7e0e8SSarah Sharp */ 37061ea7e0e8SSarah Sharp sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); 37071ea7e0e8SSarah Sharp if (!sel_values) 37081ea7e0e8SSarah Sharp return -ENOMEM; 37091ea7e0e8SSarah Sharp 37101ea7e0e8SSarah Sharp sel_values->u1_sel = u1_sel; 37111ea7e0e8SSarah Sharp sel_values->u1_pel = u1_pel; 37121ea7e0e8SSarah Sharp sel_values->u2_sel = cpu_to_le16(u2_sel); 37131ea7e0e8SSarah Sharp sel_values->u2_pel = cpu_to_le16(u2_pel); 37141ea7e0e8SSarah Sharp 37151ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 37161ea7e0e8SSarah Sharp USB_REQ_SET_SEL, 37171ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 37181ea7e0e8SSarah Sharp 0, 0, 37191ea7e0e8SSarah Sharp sel_values, sizeof *(sel_values), 37201ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 37211ea7e0e8SSarah Sharp kfree(sel_values); 37221ea7e0e8SSarah Sharp return ret; 37231ea7e0e8SSarah Sharp } 37241ea7e0e8SSarah Sharp 37251ea7e0e8SSarah Sharp /* 37261ea7e0e8SSarah Sharp * Enable or disable device-initiated U1 or U2 transitions. 37271ea7e0e8SSarah Sharp */ 37281ea7e0e8SSarah Sharp static int usb_set_device_initiated_lpm(struct usb_device *udev, 37291ea7e0e8SSarah Sharp enum usb3_link_state state, bool enable) 37301ea7e0e8SSarah Sharp { 37311ea7e0e8SSarah Sharp int ret; 37321ea7e0e8SSarah Sharp int feature; 37331ea7e0e8SSarah Sharp 37341ea7e0e8SSarah Sharp switch (state) { 37351ea7e0e8SSarah Sharp case USB3_LPM_U1: 37361ea7e0e8SSarah Sharp feature = USB_DEVICE_U1_ENABLE; 37371ea7e0e8SSarah Sharp break; 37381ea7e0e8SSarah Sharp case USB3_LPM_U2: 37391ea7e0e8SSarah Sharp feature = USB_DEVICE_U2_ENABLE; 37401ea7e0e8SSarah Sharp break; 37411ea7e0e8SSarah Sharp default: 37421ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", 37431ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable"); 37441ea7e0e8SSarah Sharp return -EINVAL; 37451ea7e0e8SSarah Sharp } 37461ea7e0e8SSarah Sharp 37471ea7e0e8SSarah Sharp if (udev->state != USB_STATE_CONFIGURED) { 37481ea7e0e8SSarah Sharp dev_dbg(&udev->dev, "%s: Can't %s %s state " 37491ea7e0e8SSarah Sharp "for unconfigured device.\n", 37501ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable", 37511ea7e0e8SSarah Sharp usb3_lpm_names[state]); 37521ea7e0e8SSarah Sharp return 0; 37531ea7e0e8SSarah Sharp } 37541ea7e0e8SSarah Sharp 37551ea7e0e8SSarah Sharp if (enable) { 37561ea7e0e8SSarah Sharp /* 37571ea7e0e8SSarah Sharp * Now send the control transfer to enable device-initiated LPM 37581ea7e0e8SSarah Sharp * for either U1 or U2. 37591ea7e0e8SSarah Sharp */ 37601ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 37611ea7e0e8SSarah Sharp USB_REQ_SET_FEATURE, 37621ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 37631ea7e0e8SSarah Sharp feature, 37641ea7e0e8SSarah Sharp 0, NULL, 0, 37651ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 37661ea7e0e8SSarah Sharp } else { 37671ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 37681ea7e0e8SSarah Sharp USB_REQ_CLEAR_FEATURE, 37691ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 37701ea7e0e8SSarah Sharp feature, 37711ea7e0e8SSarah Sharp 0, NULL, 0, 37721ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 37731ea7e0e8SSarah Sharp } 37741ea7e0e8SSarah Sharp if (ret < 0) { 37751ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", 37761ea7e0e8SSarah Sharp enable ? "Enable" : "Disable", 37771ea7e0e8SSarah Sharp usb3_lpm_names[state]); 37781ea7e0e8SSarah Sharp return -EBUSY; 37791ea7e0e8SSarah Sharp } 37801ea7e0e8SSarah Sharp return 0; 37811ea7e0e8SSarah Sharp } 37821ea7e0e8SSarah Sharp 37831ea7e0e8SSarah Sharp static int usb_set_lpm_timeout(struct usb_device *udev, 37841ea7e0e8SSarah Sharp enum usb3_link_state state, int timeout) 37851ea7e0e8SSarah Sharp { 37861ea7e0e8SSarah Sharp int ret; 37871ea7e0e8SSarah Sharp int feature; 37881ea7e0e8SSarah Sharp 37891ea7e0e8SSarah Sharp switch (state) { 37901ea7e0e8SSarah Sharp case USB3_LPM_U1: 37911ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U1_TIMEOUT; 37921ea7e0e8SSarah Sharp break; 37931ea7e0e8SSarah Sharp case USB3_LPM_U2: 37941ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U2_TIMEOUT; 37951ea7e0e8SSarah Sharp break; 37961ea7e0e8SSarah Sharp default: 37971ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", 37981ea7e0e8SSarah Sharp __func__); 37991ea7e0e8SSarah Sharp return -EINVAL; 38001ea7e0e8SSarah Sharp } 38011ea7e0e8SSarah Sharp 38021ea7e0e8SSarah Sharp if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && 38031ea7e0e8SSarah Sharp timeout != USB3_LPM_DEVICE_INITIATED) { 38041ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " 38051ea7e0e8SSarah Sharp "which is a reserved value.\n", 38061ea7e0e8SSarah Sharp usb3_lpm_names[state], timeout); 38071ea7e0e8SSarah Sharp return -EINVAL; 38081ea7e0e8SSarah Sharp } 38091ea7e0e8SSarah Sharp 38101ea7e0e8SSarah Sharp ret = set_port_feature(udev->parent, 38111ea7e0e8SSarah Sharp USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, 38121ea7e0e8SSarah Sharp feature); 38131ea7e0e8SSarah Sharp if (ret < 0) { 38141ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," 38151ea7e0e8SSarah Sharp "error code %i\n", usb3_lpm_names[state], 38161ea7e0e8SSarah Sharp timeout, ret); 38171ea7e0e8SSarah Sharp return -EBUSY; 38181ea7e0e8SSarah Sharp } 38191ea7e0e8SSarah Sharp if (state == USB3_LPM_U1) 38201ea7e0e8SSarah Sharp udev->u1_params.timeout = timeout; 38211ea7e0e8SSarah Sharp else 38221ea7e0e8SSarah Sharp udev->u2_params.timeout = timeout; 38231ea7e0e8SSarah Sharp return 0; 38241ea7e0e8SSarah Sharp } 38251ea7e0e8SSarah Sharp 38261ea7e0e8SSarah Sharp /* 38271ea7e0e8SSarah Sharp * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated 38281ea7e0e8SSarah Sharp * U1/U2 entry. 38291ea7e0e8SSarah Sharp * 38301ea7e0e8SSarah Sharp * We will attempt to enable U1 or U2, but there are no guarantees that the 38311ea7e0e8SSarah Sharp * control transfers to set the hub timeout or enable device-initiated U1/U2 38321ea7e0e8SSarah Sharp * will be successful. 38331ea7e0e8SSarah Sharp * 38341ea7e0e8SSarah Sharp * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI 38351ea7e0e8SSarah Sharp * driver know about it. If that call fails, it should be harmless, and just 38361ea7e0e8SSarah Sharp * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. 38371ea7e0e8SSarah Sharp */ 38381ea7e0e8SSarah Sharp static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 38391ea7e0e8SSarah Sharp enum usb3_link_state state) 38401ea7e0e8SSarah Sharp { 384165a95b75SSarah Sharp int timeout, ret; 3842ae8963adSSarah Sharp __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; 3843ae8963adSSarah Sharp __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; 3844ae8963adSSarah Sharp 3845ae8963adSSarah Sharp /* If the device says it doesn't have *any* exit latency to come out of 3846ae8963adSSarah Sharp * U1 or U2, it's probably lying. Assume it doesn't implement that link 3847ae8963adSSarah Sharp * state. 3848ae8963adSSarah Sharp */ 3849ae8963adSSarah Sharp if ((state == USB3_LPM_U1 && u1_mel == 0) || 3850ae8963adSSarah Sharp (state == USB3_LPM_U2 && u2_mel == 0)) 3851ae8963adSSarah Sharp return; 38521ea7e0e8SSarah Sharp 385365a95b75SSarah Sharp /* 385465a95b75SSarah Sharp * First, let the device know about the exit latencies 385565a95b75SSarah Sharp * associated with the link state we're about to enable. 385665a95b75SSarah Sharp */ 385765a95b75SSarah Sharp ret = usb_req_set_sel(udev, state); 385865a95b75SSarah Sharp if (ret < 0) { 385965a95b75SSarah Sharp dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", 386065a95b75SSarah Sharp usb3_lpm_names[state]); 386165a95b75SSarah Sharp return; 386265a95b75SSarah Sharp } 386365a95b75SSarah Sharp 38641ea7e0e8SSarah Sharp /* We allow the host controller to set the U1/U2 timeout internally 38651ea7e0e8SSarah Sharp * first, so that it can change its schedule to account for the 38661ea7e0e8SSarah Sharp * additional latency to send data to a device in a lower power 38671ea7e0e8SSarah Sharp * link state. 38681ea7e0e8SSarah Sharp */ 38691ea7e0e8SSarah Sharp timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); 38701ea7e0e8SSarah Sharp 38711ea7e0e8SSarah Sharp /* xHCI host controller doesn't want to enable this LPM state. */ 38721ea7e0e8SSarah Sharp if (timeout == 0) 38731ea7e0e8SSarah Sharp return; 38741ea7e0e8SSarah Sharp 38751ea7e0e8SSarah Sharp if (timeout < 0) { 38761ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not enable %s link state, " 38771ea7e0e8SSarah Sharp "xHCI error %i.\n", usb3_lpm_names[state], 38781ea7e0e8SSarah Sharp timeout); 38791ea7e0e8SSarah Sharp return; 38801ea7e0e8SSarah Sharp } 38811ea7e0e8SSarah Sharp 38821ea7e0e8SSarah Sharp if (usb_set_lpm_timeout(udev, state, timeout)) 38831ea7e0e8SSarah Sharp /* If we can't set the parent hub U1/U2 timeout, 38841ea7e0e8SSarah Sharp * device-initiated LPM won't be allowed either, so let the xHCI 38851ea7e0e8SSarah Sharp * host know that this link state won't be enabled. 38861ea7e0e8SSarah Sharp */ 38871ea7e0e8SSarah Sharp hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); 38881ea7e0e8SSarah Sharp 38891ea7e0e8SSarah Sharp /* Only a configured device will accept the Set Feature U1/U2_ENABLE */ 38901ea7e0e8SSarah Sharp else if (udev->actconfig) 38911ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, true); 38921ea7e0e8SSarah Sharp 38931ea7e0e8SSarah Sharp } 38941ea7e0e8SSarah Sharp 38951ea7e0e8SSarah Sharp /* 38961ea7e0e8SSarah Sharp * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated 38971ea7e0e8SSarah Sharp * U1/U2 entry. 38981ea7e0e8SSarah Sharp * 38991ea7e0e8SSarah Sharp * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. 39001ea7e0e8SSarah Sharp * If zero is returned, the parent will not allow the link to go into U1/U2. 39011ea7e0e8SSarah Sharp * 39021ea7e0e8SSarah Sharp * If zero is returned, device-initiated U1/U2 entry may still be enabled, but 39031ea7e0e8SSarah Sharp * it won't have an effect on the bus link state because the parent hub will 39041ea7e0e8SSarah Sharp * still disallow device-initiated U1/U2 entry. 39051ea7e0e8SSarah Sharp * 39061ea7e0e8SSarah Sharp * If zero is returned, the xHCI host controller may still think U1/U2 entry is 39071ea7e0e8SSarah Sharp * possible. The result will be slightly more bus bandwidth will be taken up 39081ea7e0e8SSarah Sharp * (to account for U1/U2 exit latency), but it should be harmless. 39091ea7e0e8SSarah Sharp */ 39101ea7e0e8SSarah Sharp static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 39111ea7e0e8SSarah Sharp enum usb3_link_state state) 39121ea7e0e8SSarah Sharp { 39131ea7e0e8SSarah Sharp switch (state) { 39141ea7e0e8SSarah Sharp case USB3_LPM_U1: 39151ea7e0e8SSarah Sharp case USB3_LPM_U2: 39161ea7e0e8SSarah Sharp break; 39171ea7e0e8SSarah Sharp default: 39181ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", 39191ea7e0e8SSarah Sharp __func__); 39201ea7e0e8SSarah Sharp return -EINVAL; 39211ea7e0e8SSarah Sharp } 39221ea7e0e8SSarah Sharp 39231ea7e0e8SSarah Sharp if (usb_set_lpm_timeout(udev, state, 0)) 39241ea7e0e8SSarah Sharp return -EBUSY; 39251ea7e0e8SSarah Sharp 39261ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, false); 39271ea7e0e8SSarah Sharp 39281ea7e0e8SSarah Sharp if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) 39291ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " 39301ea7e0e8SSarah Sharp "bus schedule bandwidth may be impacted.\n", 39311ea7e0e8SSarah Sharp usb3_lpm_names[state]); 39321ea7e0e8SSarah Sharp return 0; 39331ea7e0e8SSarah Sharp } 39341ea7e0e8SSarah Sharp 39351ea7e0e8SSarah Sharp /* 39361ea7e0e8SSarah Sharp * Disable hub-initiated and device-initiated U1 and U2 entry. 39371ea7e0e8SSarah Sharp * Caller must own the bandwidth_mutex. 39381ea7e0e8SSarah Sharp * 39391ea7e0e8SSarah Sharp * This will call usb_enable_lpm() on failure, which will decrement 39401ea7e0e8SSarah Sharp * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. 39411ea7e0e8SSarah Sharp */ 39421ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 39431ea7e0e8SSarah Sharp { 39441ea7e0e8SSarah Sharp struct usb_hcd *hcd; 39451ea7e0e8SSarah Sharp 39461ea7e0e8SSarah Sharp if (!udev || !udev->parent || 39471ea7e0e8SSarah Sharp udev->speed != USB_SPEED_SUPER || 394851df62ffSPratyush Anand !udev->lpm_capable || 394951df62ffSPratyush Anand udev->state < USB_STATE_DEFAULT) 39501ea7e0e8SSarah Sharp return 0; 39511ea7e0e8SSarah Sharp 39521ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 39531ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) 39541ea7e0e8SSarah Sharp return 0; 39551ea7e0e8SSarah Sharp 39561ea7e0e8SSarah Sharp udev->lpm_disable_count++; 395755558c33SDan Carpenter if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) 39581ea7e0e8SSarah Sharp return 0; 39591ea7e0e8SSarah Sharp 39601ea7e0e8SSarah Sharp /* If LPM is enabled, attempt to disable it. */ 39611ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) 39621ea7e0e8SSarah Sharp goto enable_lpm; 39631ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) 39641ea7e0e8SSarah Sharp goto enable_lpm; 39651ea7e0e8SSarah Sharp 3966655fe4efSKevin Strasser udev->usb3_lpm_enabled = 0; 3967655fe4efSKevin Strasser 39681ea7e0e8SSarah Sharp return 0; 39691ea7e0e8SSarah Sharp 39701ea7e0e8SSarah Sharp enable_lpm: 39711ea7e0e8SSarah Sharp usb_enable_lpm(udev); 39721ea7e0e8SSarah Sharp return -EBUSY; 39731ea7e0e8SSarah Sharp } 39741ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 39751ea7e0e8SSarah Sharp 39761ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ 39771ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 39781ea7e0e8SSarah Sharp { 39791ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 39801ea7e0e8SSarah Sharp int ret; 39811ea7e0e8SSarah Sharp 39821ea7e0e8SSarah Sharp if (!hcd) 39831ea7e0e8SSarah Sharp return -EINVAL; 39841ea7e0e8SSarah Sharp 39851ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 39861ea7e0e8SSarah Sharp ret = usb_disable_lpm(udev); 39871ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 39881ea7e0e8SSarah Sharp 39891ea7e0e8SSarah Sharp return ret; 39901ea7e0e8SSarah Sharp } 39911ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 39921ea7e0e8SSarah Sharp 39931ea7e0e8SSarah Sharp /* 39941ea7e0e8SSarah Sharp * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The 39951ea7e0e8SSarah Sharp * xHCI host policy may prevent U1 or U2 from being enabled. 39961ea7e0e8SSarah Sharp * 39971ea7e0e8SSarah Sharp * Other callers may have disabled link PM, so U1 and U2 entry will be disabled 39981ea7e0e8SSarah Sharp * until the lpm_disable_count drops to zero. Caller must own the 39991ea7e0e8SSarah Sharp * bandwidth_mutex. 40001ea7e0e8SSarah Sharp */ 40011ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) 40021ea7e0e8SSarah Sharp { 40031ea7e0e8SSarah Sharp struct usb_hcd *hcd; 40041ea7e0e8SSarah Sharp 40051ea7e0e8SSarah Sharp if (!udev || !udev->parent || 40061ea7e0e8SSarah Sharp udev->speed != USB_SPEED_SUPER || 400751df62ffSPratyush Anand !udev->lpm_capable || 400851df62ffSPratyush Anand udev->state < USB_STATE_DEFAULT) 40091ea7e0e8SSarah Sharp return; 40101ea7e0e8SSarah Sharp 40111ea7e0e8SSarah Sharp udev->lpm_disable_count--; 40121ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 40131ea7e0e8SSarah Sharp /* Double check that we can both enable and disable LPM. 40141ea7e0e8SSarah Sharp * Device must be configured to accept set feature U1/U2 timeout. 40151ea7e0e8SSarah Sharp */ 40161ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || 40171ea7e0e8SSarah Sharp !hcd->driver->disable_usb3_lpm_timeout) 40181ea7e0e8SSarah Sharp return; 40191ea7e0e8SSarah Sharp 40201ea7e0e8SSarah Sharp if (udev->lpm_disable_count > 0) 40211ea7e0e8SSarah Sharp return; 40221ea7e0e8SSarah Sharp 40231ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U1); 40241ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U2); 4025655fe4efSKevin Strasser 4026655fe4efSKevin Strasser udev->usb3_lpm_enabled = 1; 40271ea7e0e8SSarah Sharp } 40281ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 40291ea7e0e8SSarah Sharp 40301ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ 40311ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) 40321ea7e0e8SSarah Sharp { 40331ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 40341ea7e0e8SSarah Sharp 40351ea7e0e8SSarah Sharp if (!hcd) 40361ea7e0e8SSarah Sharp return; 40371ea7e0e8SSarah Sharp 40381ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 40391ea7e0e8SSarah Sharp usb_enable_lpm(udev); 40401ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 40411ea7e0e8SSarah Sharp } 40421ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 40431ea7e0e8SSarah Sharp 40441ea7e0e8SSarah Sharp 4045d388dab7SAlan Stern #else /* CONFIG_PM */ 4046d388dab7SAlan Stern 4047511366daSAndrew Morton #define hub_suspend NULL 4048511366daSAndrew Morton #define hub_resume NULL 4049f07600cfSAlan Stern #define hub_reset_resume NULL 40501ea7e0e8SSarah Sharp 40511ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 40521ea7e0e8SSarah Sharp { 40531ea7e0e8SSarah Sharp return 0; 40541ea7e0e8SSarah Sharp } 4055e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 40561ea7e0e8SSarah Sharp 40571ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) { } 4058e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 40591ea7e0e8SSarah Sharp 40601ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 40611ea7e0e8SSarah Sharp { 40621ea7e0e8SSarah Sharp return 0; 40631ea7e0e8SSarah Sharp } 4064e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 40651ea7e0e8SSarah Sharp 40661ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) { } 4067e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 4068f74631e3SSarah Sharp 4069f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 4070f74631e3SSarah Sharp { 4071f74631e3SSarah Sharp return 0; 4072f74631e3SSarah Sharp } 4073f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 4074f74631e3SSarah Sharp 4075f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) { } 4076f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 4077c4b51a43SAlan Stern 40784a95b1fcSStephen Rothwell static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, 40794a95b1fcSStephen Rothwell u16 portstatus, u16 portchange) 40804a95b1fcSStephen Rothwell { 40814a95b1fcSStephen Rothwell return 0; 40824a95b1fcSStephen Rothwell } 40834a95b1fcSStephen Rothwell 4084c4b51a43SAlan Stern #endif /* CONFIG_PM */ 4085d388dab7SAlan Stern 40861da177e4SLinus Torvalds 40871da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 40881da177e4SLinus Torvalds * 40891da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 40901da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 40911da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 40921da177e4SLinus Torvalds * 40931da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 40941da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 40951da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 40961da177e4SLinus Torvalds * 40971da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 40981da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 40991da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 41001da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 41011da177e4SLinus Torvalds */ 4102ad493e5eSLan Tianyu int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) 41031da177e4SLinus Torvalds { 41041da177e4SLinus Torvalds int ret; 41051da177e4SLinus Torvalds u16 portchange, portstatus; 41061da177e4SLinus Torvalds unsigned connection = 0xffff; 4107d99f6b41SDan Williams int total_time, stable_time = 0; 4108d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 41091da177e4SLinus Torvalds 41101da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 41111da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 41121da177e4SLinus Torvalds if (ret < 0) 41131da177e4SLinus Torvalds return ret; 41141da177e4SLinus Torvalds 41151da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 41161da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 4117ad493e5eSLan Tianyu if (!must_be_connected || 4118ad493e5eSLan Tianyu (connection == USB_PORT_STAT_CONNECTION)) 41191da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 41201da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 41211da177e4SLinus Torvalds break; 41221da177e4SLinus Torvalds } else { 41231da177e4SLinus Torvalds stable_time = 0; 41241da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 41251da177e4SLinus Torvalds } 41261da177e4SLinus Torvalds 41271da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 4128ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 41291da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 41301da177e4SLinus Torvalds } 41311da177e4SLinus Torvalds 41321da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 41331da177e4SLinus Torvalds break; 41341da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 41351da177e4SLinus Torvalds } 41361da177e4SLinus Torvalds 4137d99f6b41SDan Williams dev_dbg(&port_dev->dev, "debounce total %dms stable %dms status 0x%x\n", 4138d99f6b41SDan Williams total_time, stable_time, portstatus); 41391da177e4SLinus Torvalds 41401da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 41411da177e4SLinus Torvalds return -ETIMEDOUT; 41421da177e4SLinus Torvalds return portstatus; 41431da177e4SLinus Torvalds } 41441da177e4SLinus Torvalds 4145fc721f51SInaky Perez-Gonzalez void usb_ep0_reinit(struct usb_device *udev) 41461da177e4SLinus Torvalds { 4147ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); 4148ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); 41492caf7fcdSAlan Stern usb_enable_endpoint(udev, &udev->ep0, true); 41501da177e4SLinus Torvalds } 4151fc721f51SInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_ep0_reinit); 41521da177e4SLinus Torvalds 41531da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 41541da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 41551da177e4SLinus Torvalds 41564326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 41571da177e4SLinus Torvalds { 41581da177e4SLinus Torvalds int retval; 4159c6515272SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 41601da177e4SLinus Torvalds 4161c6515272SSarah Sharp /* 4162c6515272SSarah Sharp * The host controller will choose the device address, 4163c6515272SSarah Sharp * instead of the core having chosen it earlier 4164c6515272SSarah Sharp */ 4165c6515272SSarah Sharp if (!hcd->driver->address_device && devnum <= 1) 41661da177e4SLinus Torvalds return -EINVAL; 41671da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 41681da177e4SLinus Torvalds return 0; 41691da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 41701da177e4SLinus Torvalds return -EINVAL; 4171c8d4af8eSAndiry Xu if (hcd->driver->address_device) 4172c6515272SSarah Sharp retval = hcd->driver->address_device(hcd, udev); 4173c8d4af8eSAndiry Xu else 41741da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 41754326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 41761da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 41771da177e4SLinus Torvalds if (retval == 0) { 41783b29b68bSAlan Stern update_devnum(udev, devnum); 41794953d141SDavid Vrabel /* Device now using proper address. */ 41801da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 4181fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 41821da177e4SLinus Torvalds } 41831da177e4SLinus Torvalds return retval; 41841da177e4SLinus Torvalds } 41851da177e4SLinus Torvalds 4186890dae88SMathias Nyman /* 4187890dae88SMathias Nyman * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM 4188890dae88SMathias Nyman * when they're plugged into a USB 2.0 port, but they don't work when LPM is 4189890dae88SMathias Nyman * enabled. 4190890dae88SMathias Nyman * 4191890dae88SMathias Nyman * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the 4192890dae88SMathias Nyman * device says it supports the new USB 2.0 Link PM errata by setting the BESL 4193890dae88SMathias Nyman * support bit in the BOS descriptor. 4194890dae88SMathias Nyman */ 4195890dae88SMathias Nyman static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev) 4196890dae88SMathias Nyman { 4197d99f6b41SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 4198d99f6b41SDan Williams int connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN; 4199890dae88SMathias Nyman 4200890dae88SMathias Nyman if (!udev->usb2_hw_lpm_capable) 4201890dae88SMathias Nyman return; 4202890dae88SMathias Nyman 4203d99f6b41SDan Williams if (hub) 4204d99f6b41SDan Williams connect_type = hub->ports[udev->portnum - 1]->connect_type; 4205890dae88SMathias Nyman 420623c05820SBjørn Mork if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) || 4207890dae88SMathias Nyman connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 4208890dae88SMathias Nyman udev->usb2_hw_lpm_allowed = 1; 4209890dae88SMathias Nyman usb_set_usb2_hardware_lpm(udev, 1); 4210890dae88SMathias Nyman } 4211890dae88SMathias Nyman } 4212890dae88SMathias Nyman 421348fc7dbdSDan Williams static int hub_enable_device(struct usb_device *udev) 421448fc7dbdSDan Williams { 421548fc7dbdSDan Williams struct usb_hcd *hcd = bus_to_hcd(udev->bus); 421648fc7dbdSDan Williams 421748fc7dbdSDan Williams if (!hcd->driver->enable_device) 421848fc7dbdSDan Williams return 0; 421948fc7dbdSDan Williams if (udev->state == USB_STATE_ADDRESS) 422048fc7dbdSDan Williams return 0; 422148fc7dbdSDan Williams if (udev->state != USB_STATE_DEFAULT) 422248fc7dbdSDan Williams return -EINVAL; 422348fc7dbdSDan Williams 422448fc7dbdSDan Williams return hcd->driver->enable_device(hcd, udev); 422548fc7dbdSDan Williams } 422648fc7dbdSDan Williams 42271da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 42281da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 42291da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 42301da177e4SLinus Torvalds * 42311da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 42325c79a1e3SDan Williams * usb_reset_and_verify_device), the caller must own the device lock and 42335c79a1e3SDan Williams * the port lock. For a newly detected device that is not accessible 42345c79a1e3SDan Williams * through any global pointers, it's not necessary to lock the device, 42355c79a1e3SDan Williams * but it is still necessary to lock the port. 42361da177e4SLinus Torvalds */ 42371da177e4SLinus Torvalds static int 42381da177e4SLinus Torvalds hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1, 42391da177e4SLinus Torvalds int retry_counter) 42401da177e4SLinus Torvalds { 42411da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4242e7b77172SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 42431da177e4SLinus Torvalds int i, j, retval; 42441da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 42451da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 4246e538dfdaSMichal Nazarewicz const char *speed; 42474326ed0bSAlan Stern int devnum = udev->devnum; 42481da177e4SLinus Torvalds 42491da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 42501da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 42511da177e4SLinus Torvalds */ 42521da177e4SLinus Torvalds if (!hdev->parent) { 42531da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 42541da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 42551da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 42561da177e4SLinus Torvalds } 42571da177e4SLinus Torvalds 42581da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 42591da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 42601da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 42611da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 42621da177e4SLinus Torvalds 42636fecd4f2STodd E Brandt mutex_lock(&hdev->bus->usb_address0_mutex); 42641da177e4SLinus Torvalds 42651da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 4266e7b77172SSarah Sharp /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ 426775d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 42681da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 42691da177e4SLinus Torvalds goto fail; 42701da177e4SLinus Torvalds /* success, speed is known */ 427107194ab7SLuben Tuikov 42721da177e4SLinus Torvalds retval = -ENODEV; 42731da177e4SLinus Torvalds 42741da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 42751da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 42761da177e4SLinus Torvalds goto fail; 42771da177e4SLinus Torvalds } 42781da177e4SLinus Torvalds oldspeed = udev->speed; 42791da177e4SLinus Torvalds 42801da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 42811da177e4SLinus Torvalds * it's fixed size except for full speed devices. 42825bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 42835bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 42841da177e4SLinus Torvalds */ 42851da177e4SLinus Torvalds switch (udev->speed) { 42866b403b02SSarah Sharp case USB_SPEED_SUPER: 4287551cdbbeSGreg Kroah-Hartman case USB_SPEED_WIRELESS: /* fixed at 512 */ 4288551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); 42895bb6e0aeSInaky Perez-Gonzalez break; 42901da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 4291551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 42921da177e4SLinus Torvalds break; 42931da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 42941da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 42951da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 42961da177e4SLinus Torvalds * then correct our initial guess. 42971da177e4SLinus Torvalds */ 4298551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 42991da177e4SLinus Torvalds break; 43001da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 4301551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); 43021da177e4SLinus Torvalds break; 43031da177e4SLinus Torvalds default: 43041da177e4SLinus Torvalds goto fail; 43051da177e4SLinus Torvalds } 43061da177e4SLinus Torvalds 4307e538dfdaSMichal Nazarewicz if (udev->speed == USB_SPEED_WIRELESS) 4308e538dfdaSMichal Nazarewicz speed = "variable speed Wireless"; 4309e538dfdaSMichal Nazarewicz else 4310e538dfdaSMichal Nazarewicz speed = usb_speed_string(udev->speed); 4311e538dfdaSMichal Nazarewicz 4312c6515272SSarah Sharp if (udev->speed != USB_SPEED_SUPER) 431383a07196SInaky Perez-Gonzalez dev_info(&udev->dev, 4314e538dfdaSMichal Nazarewicz "%s %s USB device number %d using %s\n", 4315e538dfdaSMichal Nazarewicz (udev->config) ? "reset" : "new", speed, 43163b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 43171da177e4SLinus Torvalds 43181da177e4SLinus Torvalds /* Set up TT records, if needed */ 43191da177e4SLinus Torvalds if (hdev->tt) { 43201da177e4SLinus Torvalds udev->tt = hdev->tt; 43211da177e4SLinus Torvalds udev->ttport = hdev->ttport; 43221da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 43231da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 4324d199c96dSAlan Stern if (!hub->tt.hub) { 4325d199c96dSAlan Stern dev_err(&udev->dev, "parent hub has no TT\n"); 4326d199c96dSAlan Stern retval = -EINVAL; 4327d199c96dSAlan Stern goto fail; 4328d199c96dSAlan Stern } 43291da177e4SLinus Torvalds udev->tt = &hub->tt; 43301da177e4SLinus Torvalds udev->ttport = port1; 43311da177e4SLinus Torvalds } 43321da177e4SLinus Torvalds 43331da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 43341da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 43351da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 43361da177e4SLinus Torvalds * Change it cautiously. 43371da177e4SLinus Torvalds * 433848fc7dbdSDan Williams * NOTE: If use_new_scheme() is true we will start by issuing 43391da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 43401da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 43411da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 43421da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 43431da177e4SLinus Torvalds * value. 43441da177e4SLinus Torvalds */ 43451da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 434648fc7dbdSDan Williams bool did_new_scheme = false; 434748fc7dbdSDan Williams 434848fc7dbdSDan Williams if (use_new_scheme(udev, retry_counter)) { 43491da177e4SLinus Torvalds struct usb_device_descriptor *buf; 43501da177e4SLinus Torvalds int r = 0; 43511da177e4SLinus Torvalds 435248fc7dbdSDan Williams did_new_scheme = true; 435348fc7dbdSDan Williams retval = hub_enable_device(udev); 4354938569ebSOliver Neukum if (retval < 0) { 4355938569ebSOliver Neukum dev_err(&udev->dev, 4356938569ebSOliver Neukum "hub failed to enable device, error %d\n", 4357938569ebSOliver Neukum retval); 435848fc7dbdSDan Williams goto fail; 4359938569ebSOliver Neukum } 436048fc7dbdSDan Williams 43611da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 43621da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 43631da177e4SLinus Torvalds if (!buf) { 43641da177e4SLinus Torvalds retval = -ENOMEM; 43651da177e4SLinus Torvalds continue; 43661da177e4SLinus Torvalds } 43671da177e4SLinus Torvalds 4368b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 4369b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 4370b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 43711da177e4SLinus Torvalds */ 43721da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 43731da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 43741da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 43751da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 43761da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 43771da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 4378fd7c519dSJaroslav Kysela initial_descriptor_timeout); 43791da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 43805bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 43811da177e4SLinus Torvalds if (buf->bDescriptorType == 43821da177e4SLinus Torvalds USB_DT_DEVICE) { 43831da177e4SLinus Torvalds r = 0; 43841da177e4SLinus Torvalds break; 43851da177e4SLinus Torvalds } 43861da177e4SLinus Torvalds /* FALL THROUGH */ 43871da177e4SLinus Torvalds default: 43881da177e4SLinus Torvalds if (r == 0) 43891da177e4SLinus Torvalds r = -EPROTO; 43901da177e4SLinus Torvalds break; 43911da177e4SLinus Torvalds } 43921da177e4SLinus Torvalds if (r == 0) 43931da177e4SLinus Torvalds break; 43941da177e4SLinus Torvalds } 43951da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 43961da177e4SLinus Torvalds buf->bMaxPacketSize0; 43971da177e4SLinus Torvalds kfree(buf); 43981da177e4SLinus Torvalds 439975d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 44001da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 44011da177e4SLinus Torvalds goto fail; 44021da177e4SLinus Torvalds if (oldspeed != udev->speed) { 44031da177e4SLinus Torvalds dev_dbg(&udev->dev, 44041da177e4SLinus Torvalds "device reset changed speed!\n"); 44051da177e4SLinus Torvalds retval = -ENODEV; 44061da177e4SLinus Torvalds goto fail; 44071da177e4SLinus Torvalds } 44081da177e4SLinus Torvalds if (r) { 4409e9e88fb7SAlan Stern if (r != -ENODEV) 4410e9e88fb7SAlan Stern dev_err(&udev->dev, "device descriptor read/64, error %d\n", 4411b9cef6c3SWu Fengguang r); 44121da177e4SLinus Torvalds retval = -EMSGSIZE; 44131da177e4SLinus Torvalds continue; 44141da177e4SLinus Torvalds } 44151da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 44161da177e4SLinus Torvalds } 44171da177e4SLinus Torvalds 44186c529cdcSInaky Perez-Gonzalez /* 44196c529cdcSInaky Perez-Gonzalez * If device is WUSB, we already assigned an 44206c529cdcSInaky Perez-Gonzalez * unauthorized address in the Connect Ack sequence; 44216c529cdcSInaky Perez-Gonzalez * authorization will assign the final address. 44226c529cdcSInaky Perez-Gonzalez */ 44236c529cdcSInaky Perez-Gonzalez if (udev->wusb == 0) { 44241da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 44254326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 44261da177e4SLinus Torvalds if (retval >= 0) 44271da177e4SLinus Torvalds break; 44281da177e4SLinus Torvalds msleep(200); 44291da177e4SLinus Torvalds } 44301da177e4SLinus Torvalds if (retval < 0) { 4431e9e88fb7SAlan Stern if (retval != -ENODEV) 4432e9e88fb7SAlan Stern dev_err(&udev->dev, "device not accepting address %d, error %d\n", 44334326ed0bSAlan Stern devnum, retval); 44341da177e4SLinus Torvalds goto fail; 44351da177e4SLinus Torvalds } 4436c6515272SSarah Sharp if (udev->speed == USB_SPEED_SUPER) { 4437c6515272SSarah Sharp devnum = udev->devnum; 4438c6515272SSarah Sharp dev_info(&udev->dev, 44393b29b68bSAlan Stern "%s SuperSpeed USB device number %d using %s\n", 4440c6515272SSarah Sharp (udev->config) ? "reset" : "new", 44413b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 4442c6515272SSarah Sharp } 44431da177e4SLinus Torvalds 44441da177e4SLinus Torvalds /* cope with hardware quirkiness: 44451da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 44461da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 44471da177e4SLinus Torvalds */ 44481da177e4SLinus Torvalds msleep(10); 444948fc7dbdSDan Williams /* use_new_scheme() checks the speed which may have 445048fc7dbdSDan Williams * changed since the initial look so we cache the result 445148fc7dbdSDan Williams * in did_new_scheme 445248fc7dbdSDan Williams */ 445348fc7dbdSDan Williams if (did_new_scheme) 44541da177e4SLinus Torvalds break; 44556c529cdcSInaky Perez-Gonzalez } 44561da177e4SLinus Torvalds 44571da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 44581da177e4SLinus Torvalds if (retval < 8) { 4459e9e88fb7SAlan Stern if (retval != -ENODEV) 4460b9cef6c3SWu Fengguang dev_err(&udev->dev, 4461b9cef6c3SWu Fengguang "device descriptor read/8, error %d\n", 4462b9cef6c3SWu Fengguang retval); 44631da177e4SLinus Torvalds if (retval >= 0) 44641da177e4SLinus Torvalds retval = -EMSGSIZE; 44651da177e4SLinus Torvalds } else { 44661da177e4SLinus Torvalds retval = 0; 44671da177e4SLinus Torvalds break; 44681da177e4SLinus Torvalds } 44691da177e4SLinus Torvalds } 44701da177e4SLinus Torvalds if (retval) 44711da177e4SLinus Torvalds goto fail; 44721da177e4SLinus Torvalds 4473d8aec3dbSElric Fu /* 4474d8aec3dbSElric Fu * Some superspeed devices have finished the link training process 4475d8aec3dbSElric Fu * and attached to a superspeed hub port, but the device descriptor 4476d8aec3dbSElric Fu * got from those devices show they aren't superspeed devices. Warm 4477d8aec3dbSElric Fu * reset the port attached by the devices can fix them. 4478d8aec3dbSElric Fu */ 4479d8aec3dbSElric Fu if ((udev->speed == USB_SPEED_SUPER) && 4480d8aec3dbSElric Fu (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { 4481d8aec3dbSElric Fu dev_err(&udev->dev, "got a wrong device descriptor, " 4482d8aec3dbSElric Fu "warm reset device\n"); 4483d8aec3dbSElric Fu hub_port_reset(hub, port1, udev, 4484d8aec3dbSElric Fu HUB_BH_RESET_TIME, true); 4485d8aec3dbSElric Fu retval = -EINVAL; 4486d8aec3dbSElric Fu goto fail; 4487d8aec3dbSElric Fu } 4488d8aec3dbSElric Fu 44896b403b02SSarah Sharp if (udev->descriptor.bMaxPacketSize0 == 0xff || 44906b403b02SSarah Sharp udev->speed == USB_SPEED_SUPER) 44916b403b02SSarah Sharp i = 512; 44926b403b02SSarah Sharp else 44936b403b02SSarah Sharp i = udev->descriptor.bMaxPacketSize0; 449429cc8897SKuninori Morimoto if (usb_endpoint_maxp(&udev->ep0.desc) != i) { 449556626a72SAlan Stern if (udev->speed == USB_SPEED_LOW || 44961da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 449756626a72SAlan Stern dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); 44981da177e4SLinus Torvalds retval = -EMSGSIZE; 44991da177e4SLinus Torvalds goto fail; 45001da177e4SLinus Torvalds } 450156626a72SAlan Stern if (udev->speed == USB_SPEED_FULL) 45021da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 450356626a72SAlan Stern else 450456626a72SAlan Stern dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); 45051da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 4506fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 45071da177e4SLinus Torvalds } 45081da177e4SLinus Torvalds 45091da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 45101da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 4511e9e88fb7SAlan Stern if (retval != -ENODEV) 4512b9cef6c3SWu Fengguang dev_err(&udev->dev, "device descriptor read/all, error %d\n", 4513b9cef6c3SWu Fengguang retval); 45141da177e4SLinus Torvalds if (retval >= 0) 45151da177e4SLinus Torvalds retval = -ENOMSG; 45161da177e4SLinus Torvalds goto fail; 45171da177e4SLinus Torvalds } 45181da177e4SLinus Torvalds 4519ad87e032SAlan Stern usb_detect_quirks(udev); 4520ad87e032SAlan Stern 45211ff4df56SAndiry Xu if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { 45221ff4df56SAndiry Xu retval = usb_get_bos_descriptor(udev); 452351e0a012SSarah Sharp if (!retval) { 4524d9b2099cSSarah Sharp udev->lpm_capable = usb_device_supports_lpm(udev); 452551e0a012SSarah Sharp usb_set_lpm_parameters(udev); 452651e0a012SSarah Sharp } 45271ff4df56SAndiry Xu } 45283148bf04SAndiry Xu 45291da177e4SLinus Torvalds retval = 0; 453048f24970SAlek Du /* notify HCD that we have a device connected and addressed */ 453148f24970SAlek Du if (hcd->driver->update_device) 453248f24970SAlek Du hcd->driver->update_device(hcd, udev); 4533890dae88SMathias Nyman hub_set_initial_usb2_lpm_policy(udev); 45341da177e4SLinus Torvalds fail: 45354326ed0bSAlan Stern if (retval) { 45361da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 45373b29b68bSAlan Stern update_devnum(udev, devnum); /* for disconnect processing */ 45384326ed0bSAlan Stern } 45396fecd4f2STodd E Brandt mutex_unlock(&hdev->bus->usb_address0_mutex); 45401da177e4SLinus Torvalds return retval; 45411da177e4SLinus Torvalds } 45421da177e4SLinus Torvalds 45431da177e4SLinus Torvalds static void 45441da177e4SLinus Torvalds check_highspeed(struct usb_hub *hub, struct usb_device *udev, int port1) 45451da177e4SLinus Torvalds { 45461da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 45471da177e4SLinus Torvalds int status; 45481da177e4SLinus Torvalds 45492a159389SJohan Hovold if (udev->quirks & USB_QUIRK_DEVICE_QUALIFIER) 45502a159389SJohan Hovold return; 45512a159389SJohan Hovold 4552e94b1766SChristoph Lameter qual = kmalloc(sizeof *qual, GFP_KERNEL); 45531da177e4SLinus Torvalds if (qual == NULL) 45541da177e4SLinus Torvalds return; 45551da177e4SLinus Torvalds 45561da177e4SLinus Torvalds status = usb_get_descriptor(udev, USB_DT_DEVICE_QUALIFIER, 0, 45571da177e4SLinus Torvalds qual, sizeof *qual); 45581da177e4SLinus Torvalds if (status == sizeof *qual) { 45591da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 45601da177e4SLinus Torvalds "connect to a high speed hub\n"); 45611da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 45621da177e4SLinus Torvalds if (hub->has_indicators) { 45631da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 456422f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 456522f6a0f0SShaibal Dutta &hub->leds, 0); 45661da177e4SLinus Torvalds } 45671da177e4SLinus Torvalds } 45681da177e4SLinus Torvalds kfree(qual); 45691da177e4SLinus Torvalds } 45701da177e4SLinus Torvalds 45711da177e4SLinus Torvalds static unsigned 45721da177e4SLinus Torvalds hub_power_remaining(struct usb_hub *hub) 45731da177e4SLinus Torvalds { 45741da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 45751da177e4SLinus Torvalds int remaining; 457655c52718SAlan Stern int port1; 45771da177e4SLinus Torvalds 457855c52718SAlan Stern if (!hub->limited_power) 45791da177e4SLinus Torvalds return 0; 45801da177e4SLinus Torvalds 458155c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 458255c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 4583d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 4584d99f6b41SDan Williams struct usb_device *udev = port_dev->child; 4585430ee58eSSebastian Andrzej Siewior unsigned unit_load; 4586d99f6b41SDan Williams int delta; 45871da177e4SLinus Torvalds 45881da177e4SLinus Torvalds if (!udev) 45891da177e4SLinus Torvalds continue; 4590430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(udev)) 4591430ee58eSSebastian Andrzej Siewior unit_load = 150; 4592430ee58eSSebastian Andrzej Siewior else 4593430ee58eSSebastian Andrzej Siewior unit_load = 100; 45941da177e4SLinus Torvalds 4595430ee58eSSebastian Andrzej Siewior /* 4596430ee58eSSebastian Andrzej Siewior * Unconfigured devices may not use more than one unit load, 4597430ee58eSSebastian Andrzej Siewior * or 8mA for OTG ports 4598430ee58eSSebastian Andrzej Siewior */ 45991da177e4SLinus Torvalds if (udev->actconfig) 46008d8479dbSSebastian Andrzej Siewior delta = usb_get_max_power(udev, udev->actconfig); 460155c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 4602430ee58eSSebastian Andrzej Siewior delta = unit_load; 46031da177e4SLinus Torvalds else 460455c52718SAlan Stern delta = 8; 460555c52718SAlan Stern if (delta > hub->mA_per_port) 4606d99f6b41SDan Williams dev_warn(&port_dev->dev, "%dmA is over %umA budget!\n", 4607d99f6b41SDan Williams delta, hub->mA_per_port); 46081da177e4SLinus Torvalds remaining -= delta; 46091da177e4SLinus Torvalds } 46101da177e4SLinus Torvalds if (remaining < 0) { 461155c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 461255c52718SAlan Stern -remaining); 46131da177e4SLinus Torvalds remaining = 0; 46141da177e4SLinus Torvalds } 46151da177e4SLinus Torvalds return remaining; 46161da177e4SLinus Torvalds } 46171da177e4SLinus Torvalds 4618af376a46SDan Williams static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus, 4619af376a46SDan Williams u16 portchange) 46201da177e4SLinus Torvalds { 46211da177e4SLinus Torvalds int status, i; 4622430ee58eSSebastian Andrzej Siewior unsigned unit_load; 46231da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 46241da177e4SLinus Torvalds struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 4625d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 4626af376a46SDan Williams struct usb_device *udev = port_dev->child; 46275ee0f803SOliver Neukum static int unreliable_port = -1; 46288808f00cSAlan Stern 462924618b0cSAlan Stern /* Disconnect any existing devices under this port */ 4630b76baa81SPeter Chen if (udev) { 4631b2108f1eSPeter Chen if (hcd->usb_phy && !hdev->parent) 46323d46e73dSAntoine Tenart usb_phy_notify_disconnect(hcd->usb_phy, udev->speed); 4633d99f6b41SDan Williams usb_disconnect(&port_dev->child); 4634b76baa81SPeter Chen } 463524618b0cSAlan Stern 4636253e0572SAlan Stern /* We can forget about a "removed" device when there's a physical 4637253e0572SAlan Stern * disconnect or the connect status changes. 4638253e0572SAlan Stern */ 4639253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4640253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 4641253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 4642253e0572SAlan Stern 46435257d97aSAlan Stern if (portchange & (USB_PORT_STAT_C_CONNECTION | 46445257d97aSAlan Stern USB_PORT_STAT_C_ENABLE)) { 4645ad493e5eSLan Tianyu status = hub_port_debounce_be_stable(hub, port1); 46465257d97aSAlan Stern if (status < 0) { 46475ee0f803SOliver Neukum if (status != -ENODEV && 46485ee0f803SOliver Neukum port1 != unreliable_port && 46495ee0f803SOliver Neukum printk_ratelimit()) 4650dd5f5006STakashi Iwai dev_err(&port_dev->dev, "connect-debounce failed\n"); 46515257d97aSAlan Stern portstatus &= ~USB_PORT_STAT_CONNECTION; 46525ee0f803SOliver Neukum unreliable_port = port1; 46535257d97aSAlan Stern } else { 46545257d97aSAlan Stern portstatus = status; 46555257d97aSAlan Stern } 46565257d97aSAlan Stern } 46575257d97aSAlan Stern 4658253e0572SAlan Stern /* Return now if debouncing failed or nothing is connected or 4659253e0572SAlan Stern * the device was "removed". 4660253e0572SAlan Stern */ 4661253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4662253e0572SAlan Stern test_bit(port1, hub->removed_bits)) { 46631da177e4SLinus Torvalds 4664fbaecff0SDeepak Das /* 4665fbaecff0SDeepak Das * maybe switch power back on (e.g. root hub was reset) 4666fbaecff0SDeepak Das * but only if the port isn't owned by someone else. 4667fbaecff0SDeepak Das */ 46689262c19dSDan Williams if (hub_is_port_power_switchable(hub) 4669fbaecff0SDeepak Das && !port_is_power_on(hub, portstatus) 4670fbaecff0SDeepak Das && !port_dev->port_owner) 46711da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 46721da177e4SLinus Torvalds 46731da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 46741da177e4SLinus Torvalds goto done; 46751da177e4SLinus Torvalds return; 46761da177e4SLinus Torvalds } 4677430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hub->hdev)) 4678430ee58eSSebastian Andrzej Siewior unit_load = 150; 4679430ee58eSSebastian Andrzej Siewior else 4680430ee58eSSebastian Andrzej Siewior unit_load = 100; 46811da177e4SLinus Torvalds 4682e9e88fb7SAlan Stern status = 0; 46831da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 46841da177e4SLinus Torvalds 46851da177e4SLinus Torvalds /* reallocate for each attempt, since references 46861da177e4SLinus Torvalds * to the previous one can escape in various ways 46871da177e4SLinus Torvalds */ 46881da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 46891da177e4SLinus Torvalds if (!udev) { 4690d99f6b41SDan Williams dev_err(&port_dev->dev, 4691d99f6b41SDan Williams "couldn't allocate usb_device\n"); 46921da177e4SLinus Torvalds goto done; 46931da177e4SLinus Torvalds } 46941da177e4SLinus Torvalds 46951da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 469655c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 4697b6956ffaSAlan Stern udev->level = hdev->level + 1; 46988af548dcSInaky Perez-Gonzalez udev->wusb = hub_is_wusb(hub); 46991da177e4SLinus Torvalds 4700131dec34SSarah Sharp /* Only USB 3.0 devices are connected to SuperSpeed hubs. */ 4701131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 4702e7b77172SSarah Sharp udev->speed = USB_SPEED_SUPER; 4703e7b77172SSarah Sharp else 4704e7b77172SSarah Sharp udev->speed = USB_SPEED_UNKNOWN; 4705e7b77172SSarah Sharp 47063b29b68bSAlan Stern choose_devnum(udev); 4707c6515272SSarah Sharp if (udev->devnum <= 0) { 4708c6515272SSarah Sharp status = -ENOTCONN; /* Don't retry */ 4709c6515272SSarah Sharp goto loop; 4710c6515272SSarah Sharp } 4711c6515272SSarah Sharp 4712e7b77172SSarah Sharp /* reset (non-USB 3.0 devices) and get descriptor */ 47135c79a1e3SDan Williams usb_lock_port(port_dev); 47141da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 47155c79a1e3SDan Williams usb_unlock_port(port_dev); 47161da177e4SLinus Torvalds if (status < 0) 47171da177e4SLinus Torvalds goto loop; 47181da177e4SLinus Torvalds 471993362a87SPhil Dibowitz if (udev->quirks & USB_QUIRK_DELAY_INIT) 472093362a87SPhil Dibowitz msleep(1000); 472193362a87SPhil Dibowitz 47221da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 47231da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 47241da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 47251da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 47261da177e4SLinus Torvalds * on the parent. 47271da177e4SLinus Torvalds */ 47281da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 4729430ee58eSSebastian Andrzej Siewior && udev->bus_mA <= unit_load) { 47301da177e4SLinus Torvalds u16 devstat; 47311da177e4SLinus Torvalds 47321da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 47331da177e4SLinus Torvalds &devstat); 473415b7336eSAlan Stern if (status) { 47351da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 47361da177e4SLinus Torvalds goto loop_disable; 47371da177e4SLinus Torvalds } 47381da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 47391da177e4SLinus Torvalds dev_err(&udev->dev, 47401da177e4SLinus Torvalds "can't connect bus-powered hub " 47411da177e4SLinus Torvalds "to this port\n"); 47421da177e4SLinus Torvalds if (hub->has_indicators) { 47431da177e4SLinus Torvalds hub->indicator[port1-1] = 47441da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 474522f6a0f0SShaibal Dutta queue_delayed_work( 474622f6a0f0SShaibal Dutta system_power_efficient_wq, 474722f6a0f0SShaibal Dutta &hub->leds, 0); 47481da177e4SLinus Torvalds } 47491da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 47501da177e4SLinus Torvalds goto loop_disable; 47511da177e4SLinus Torvalds } 47521da177e4SLinus Torvalds } 47531da177e4SLinus Torvalds 47541da177e4SLinus Torvalds /* check for devices running slower than they could */ 47551da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 47561da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 47571da177e4SLinus Torvalds && highspeed_hubs != 0) 47581da177e4SLinus Torvalds check_highspeed(hub, udev, port1); 47591da177e4SLinus Torvalds 4760fa286188SGreg Kroah-Hartman /* Store the parent's children[] pointer. At this point 47611da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 47621da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 47631da177e4SLinus Torvalds */ 47641da177e4SLinus Torvalds status = 0; 47651da177e4SLinus Torvalds 4766d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 4767d8521afeSDan Williams 47681da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 47691da177e4SLinus Torvalds * been disconnected; we would race with the 47701da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 47711da177e4SLinus Torvalds */ 47721da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 47731da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 47741da177e4SLinus Torvalds status = -ENOTCONN; 47751da177e4SLinus Torvalds else 4776d99f6b41SDan Williams port_dev->child = udev; 47771da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 4778d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 47791da177e4SLinus Torvalds 47801da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 47811da177e4SLinus Torvalds if (!status) { 47821da177e4SLinus Torvalds status = usb_new_device(udev); 47831da177e4SLinus Torvalds if (status) { 4784d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 47851da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 4786d99f6b41SDan Williams port_dev->child = NULL; 47871da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 4788d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 478901ed67dcSTony Zheng } else { 479001ed67dcSTony Zheng if (hcd->usb_phy && !hdev->parent) 479101ed67dcSTony Zheng usb_phy_notify_connect(hcd->usb_phy, 479201ed67dcSTony Zheng udev->speed); 47931da177e4SLinus Torvalds } 47941da177e4SLinus Torvalds } 47951da177e4SLinus Torvalds 47961da177e4SLinus Torvalds if (status) 47971da177e4SLinus Torvalds goto loop_disable; 47981da177e4SLinus Torvalds 47991da177e4SLinus Torvalds status = hub_power_remaining(hub); 48001da177e4SLinus Torvalds if (status) 4801d99f6b41SDan Williams dev_dbg(hub->intfdev, "%dmA power budget left\n", status); 48021da177e4SLinus Torvalds 48031da177e4SLinus Torvalds return; 48041da177e4SLinus Torvalds 48051da177e4SLinus Torvalds loop_disable: 48061da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 48071da177e4SLinus Torvalds loop: 4808fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 48093b29b68bSAlan Stern release_devnum(udev); 4810f7410cedSHerbert Xu hub_free_dev(udev); 48111da177e4SLinus Torvalds usb_put_dev(udev); 4812ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 48131da177e4SLinus Torvalds break; 48141da177e4SLinus Torvalds } 48153a31155cSAlan Stern if (hub->hdev->parent || 48163a31155cSAlan Stern !hcd->driver->port_handed_over || 4817e9e88fb7SAlan Stern !(hcd->driver->port_handed_over)(hcd, port1)) { 4818e9e88fb7SAlan Stern if (status != -ENOTCONN && status != -ENODEV) 4819d99f6b41SDan Williams dev_err(&port_dev->dev, 4820d99f6b41SDan Williams "unable to enumerate USB device\n"); 4821e9e88fb7SAlan Stern } 48221da177e4SLinus Torvalds 48231da177e4SLinus Torvalds done: 48241da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 482590da096eSBalaji Rao if (hcd->driver->relinquish_port && !hub->hdev->parent) 482690da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 4827af376a46SDan Williams 48281da177e4SLinus Torvalds } 48291da177e4SLinus Torvalds 4830af376a46SDan Williams /* Handle physical or logical connection change events. 4831af376a46SDan Williams * This routine is called when: 4832af376a46SDan Williams * a port connection-change occurs; 4833af376a46SDan Williams * a port enable-change occurs (often caused by EMI); 4834af376a46SDan Williams * usb_reset_and_verify_device() encounters changed descriptors (as from 4835af376a46SDan Williams * a firmware download) 4836af376a46SDan Williams * caller already locked the hub 4837af376a46SDan Williams */ 4838af376a46SDan Williams static void hub_port_connect_change(struct usb_hub *hub, int port1, 483972937e1eSSarah Sharp u16 portstatus, u16 portchange) 48405c79a1e3SDan Williams __must_hold(&port_dev->status_lock) 4841714b07beSSarah Sharp { 4842af376a46SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 4843af376a46SDan Williams struct usb_device *udev = port_dev->child; 4844af376a46SDan Williams int status = -ENODEV; 4845714b07beSSarah Sharp 4846af376a46SDan Williams dev_dbg(&port_dev->dev, "status %04x, change %04x, %s\n", portstatus, 4847af376a46SDan Williams portchange, portspeed(hub, portstatus)); 4848af376a46SDan Williams 4849af376a46SDan Williams if (hub->has_indicators) { 4850af376a46SDan Williams set_port_led(hub, port1, HUB_LED_AUTO); 4851af376a46SDan Williams hub->indicator[port1-1] = INDICATOR_AUTO; 48524ee823b8SSarah Sharp } 4853714b07beSSarah Sharp 4854af376a46SDan Williams #ifdef CONFIG_USB_OTG 4855af376a46SDan Williams /* during HNP, don't repeat the debounce */ 4856af376a46SDan Williams if (hub->hdev->bus->is_b_host) 4857af376a46SDan Williams portchange &= ~(USB_PORT_STAT_C_CONNECTION | 4858af376a46SDan Williams USB_PORT_STAT_C_ENABLE); 4859af376a46SDan Williams #endif 4860714b07beSSarah Sharp 4861af376a46SDan Williams /* Try to resuscitate an existing device */ 4862af376a46SDan Williams if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && 4863af376a46SDan Williams udev->state != USB_STATE_NOTATTACHED) { 4864af376a46SDan Williams if (portstatus & USB_PORT_STAT_ENABLE) { 4865af376a46SDan Williams status = 0; /* Nothing to do */ 4866ceb6c9c8SRafael J. Wysocki #ifdef CONFIG_PM 4867af376a46SDan Williams } else if (udev->state == USB_STATE_SUSPENDED && 4868af376a46SDan Williams udev->persist_enabled) { 4869af376a46SDan Williams /* For a suspended device, treat this as a 4870af376a46SDan Williams * remote wakeup event. 4871af376a46SDan Williams */ 48725c79a1e3SDan Williams usb_unlock_port(port_dev); 4873af376a46SDan Williams status = usb_remote_wakeup(udev); 48745c79a1e3SDan Williams usb_lock_port(port_dev); 4875af376a46SDan Williams #endif 4876af376a46SDan Williams } else { 4877af376a46SDan Williams /* Don't resuscitate */; 4878af376a46SDan Williams } 4879af376a46SDan Williams } 4880af376a46SDan Williams clear_bit(port1, hub->change_bits); 4881af376a46SDan Williams 48825c79a1e3SDan Williams /* successfully revalidated the connection */ 4883af376a46SDan Williams if (status == 0) 4884af376a46SDan Williams return; 4885af376a46SDan Williams 48865c79a1e3SDan Williams usb_unlock_port(port_dev); 4887af376a46SDan Williams hub_port_connect(hub, port1, portstatus, portchange); 48885c79a1e3SDan Williams usb_lock_port(port_dev); 48891da177e4SLinus Torvalds } 48901da177e4SLinus Torvalds 4891af376a46SDan Williams static void port_event(struct usb_hub *hub, int port1) 48925c79a1e3SDan Williams __must_hold(&port_dev->status_lock) 4893af376a46SDan Williams { 48947671bd1eSZhuang Jin Can int connect_change; 4895af376a46SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 4896af376a46SDan Williams struct usb_device *udev = port_dev->child; 4897af376a46SDan Williams struct usb_device *hdev = hub->hdev; 4898af376a46SDan Williams u16 portstatus, portchange; 4899af376a46SDan Williams 4900af376a46SDan Williams connect_change = test_bit(port1, hub->change_bits); 4901af376a46SDan Williams clear_bit(port1, hub->event_bits); 4902af376a46SDan Williams clear_bit(port1, hub->wakeup_bits); 4903af376a46SDan Williams 4904af376a46SDan Williams if (hub_port_status(hub, port1, &portstatus, &portchange) < 0) 4905af376a46SDan Williams return; 4906af376a46SDan Williams 4907af376a46SDan Williams if (portchange & USB_PORT_STAT_C_CONNECTION) { 4908af376a46SDan Williams usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION); 4909714b07beSSarah Sharp connect_change = 1; 4910714b07beSSarah Sharp } 4911af376a46SDan Williams 4912af376a46SDan Williams if (portchange & USB_PORT_STAT_C_ENABLE) { 4913af376a46SDan Williams if (!connect_change) 4914af376a46SDan Williams dev_dbg(&port_dev->dev, "enable change, status %08x\n", 4915af376a46SDan Williams portstatus); 4916af376a46SDan Williams usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); 4917af376a46SDan Williams 4918af376a46SDan Williams /* 4919af376a46SDan Williams * EM interference sometimes causes badly shielded USB devices 4920af376a46SDan Williams * to be shutdown by the hub, this hack enables them again. 4921af376a46SDan Williams * Works at least with mouse driver. 4922af376a46SDan Williams */ 4923af376a46SDan Williams if (!(portstatus & USB_PORT_STAT_ENABLE) 4924af376a46SDan Williams && !connect_change && udev) { 4925af376a46SDan Williams dev_err(&port_dev->dev, "disabled by hub (EMI?), re-enabling...\n"); 4926af376a46SDan Williams connect_change = 1; 4927714b07beSSarah Sharp } 4928af376a46SDan Williams } 4929af376a46SDan Williams 4930af376a46SDan Williams if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 4931af376a46SDan Williams u16 status = 0, unused; 4932af376a46SDan Williams 4933af376a46SDan Williams dev_dbg(&port_dev->dev, "over-current change\n"); 4934af376a46SDan Williams usb_clear_port_feature(hdev, port1, 4935af376a46SDan Williams USB_PORT_FEAT_C_OVER_CURRENT); 4936af376a46SDan Williams msleep(100); /* Cool down */ 4937af376a46SDan Williams hub_power_on(hub, true); 4938af376a46SDan Williams hub_port_status(hub, port1, &status, &unused); 4939af376a46SDan Williams if (status & USB_PORT_STAT_OVERCURRENT) 4940af376a46SDan Williams dev_err(&port_dev->dev, "over-current condition\n"); 4941af376a46SDan Williams } 4942af376a46SDan Williams 4943af376a46SDan Williams if (portchange & USB_PORT_STAT_C_RESET) { 4944af376a46SDan Williams dev_dbg(&port_dev->dev, "reset change\n"); 4945af376a46SDan Williams usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_RESET); 4946af376a46SDan Williams } 4947af376a46SDan Williams if ((portchange & USB_PORT_STAT_C_BH_RESET) 4948af376a46SDan Williams && hub_is_superspeed(hdev)) { 4949af376a46SDan Williams dev_dbg(&port_dev->dev, "warm reset change\n"); 4950af376a46SDan Williams usb_clear_port_feature(hdev, port1, 4951af376a46SDan Williams USB_PORT_FEAT_C_BH_PORT_RESET); 4952af376a46SDan Williams } 4953af376a46SDan Williams if (portchange & USB_PORT_STAT_C_LINK_STATE) { 4954af376a46SDan Williams dev_dbg(&port_dev->dev, "link state change\n"); 4955af376a46SDan Williams usb_clear_port_feature(hdev, port1, 4956af376a46SDan Williams USB_PORT_FEAT_C_PORT_LINK_STATE); 4957af376a46SDan Williams } 4958af376a46SDan Williams if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { 4959af376a46SDan Williams dev_warn(&port_dev->dev, "config error\n"); 4960af376a46SDan Williams usb_clear_port_feature(hdev, port1, 4961af376a46SDan Williams USB_PORT_FEAT_C_PORT_CONFIG_ERROR); 4962af376a46SDan Williams } 4963af376a46SDan Williams 4964097a155fSDan Williams /* skip port actions that require the port to be powered on */ 4965097a155fSDan Williams if (!pm_runtime_active(&port_dev->dev)) 4966097a155fSDan Williams return; 4967097a155fSDan Williams 4968af376a46SDan Williams if (hub_handle_remote_wakeup(hub, port1, portstatus, portchange)) 4969af376a46SDan Williams connect_change = 1; 4970af376a46SDan Williams 4971af376a46SDan Williams /* 4972af376a46SDan Williams * Warm reset a USB3 protocol port if it's in 4973af376a46SDan Williams * SS.Inactive state. 4974af376a46SDan Williams */ 49753cd12f91SDan Williams if (hub_port_warm_reset_required(hub, port1, portstatus)) { 4976af376a46SDan Williams dev_dbg(&port_dev->dev, "do warm reset\n"); 4977af376a46SDan Williams if (!udev || !(portstatus & USB_PORT_STAT_CONNECTION) 4978af376a46SDan Williams || udev->state == USB_STATE_NOTATTACHED) { 4979af376a46SDan Williams if (hub_port_reset(hub, port1, NULL, 4980af376a46SDan Williams HUB_BH_RESET_TIME, true) < 0) 4981af376a46SDan Williams hub_port_disable(hub, port1, 1); 49827671bd1eSZhuang Jin Can } else { 49835c79a1e3SDan Williams usb_unlock_port(port_dev); 4984af376a46SDan Williams usb_lock_device(udev); 4985af376a46SDan Williams usb_reset_device(udev); 4986af376a46SDan Williams usb_unlock_device(udev); 49875c79a1e3SDan Williams usb_lock_port(port_dev); 4988af376a46SDan Williams connect_change = 0; 4989af376a46SDan Williams } 49907671bd1eSZhuang Jin Can } 4991af376a46SDan Williams 4992af376a46SDan Williams if (connect_change) 4993af376a46SDan Williams hub_port_connect_change(hub, port1, portstatus, portchange); 4994af376a46SDan Williams } 4995af376a46SDan Williams 499632a69589SPetr Mladek static void hub_event(struct work_struct *work) 49971da177e4SLinus Torvalds { 49981da177e4SLinus Torvalds struct usb_device *hdev; 49991da177e4SLinus Torvalds struct usb_interface *intf; 50001da177e4SLinus Torvalds struct usb_hub *hub; 50011da177e4SLinus Torvalds struct device *hub_dev; 50021da177e4SLinus Torvalds u16 hubstatus; 50031da177e4SLinus Torvalds u16 hubchange; 50041da177e4SLinus Torvalds int i, ret; 50051da177e4SLinus Torvalds 500632a69589SPetr Mladek hub = container_of(work, struct usb_hub, events); 50075d14f323SPetr Mladek hdev = hub->hdev; 5008e8054854SAlan Stern hub_dev = hub->intfdev; 5009e8054854SAlan Stern intf = to_usb_interface(hub_dev); 501032a69589SPetr Mladek 501140f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 50123bbc47d8SKrzysztof Mazur hdev->state, hdev->maxchild, 50131da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 50141da177e4SLinus Torvalds (u16) hub->change_bits[0], 501540f122f3SAlan Stern (u16) hub->event_bits[0]); 50161da177e4SLinus Torvalds 50171da177e4SLinus Torvalds /* Lock the device, then check to see if we were 50181da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 501906b84e8aSAlan Stern usb_lock_device(hdev); 5020e8054854SAlan Stern if (unlikely(hub->disconnected)) 502132a69589SPetr Mladek goto out_hdev_lock; 50221da177e4SLinus Torvalds 50231da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 50241da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 50257de18d8bSAlan Stern hub->error = -ENODEV; 50264330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 502732a69589SPetr Mladek goto out_hdev_lock; 50281da177e4SLinus Torvalds } 50291da177e4SLinus Torvalds 503040f122f3SAlan Stern /* Autoresume */ 503140f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 503240f122f3SAlan Stern if (ret) { 503340f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 503432a69589SPetr Mladek goto out_hdev_lock; 503540f122f3SAlan Stern } 503640f122f3SAlan Stern 503740f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 503840f122f3SAlan Stern if (hub->quiescing) 5039eb6e2924SPetr Mladek goto out_autopm; 50401da177e4SLinus Torvalds 50411da177e4SLinus Torvalds if (hub->error) { 5042eb6e2924SPetr Mladek dev_dbg(hub_dev, "resetting for error %d\n", hub->error); 50431da177e4SLinus Torvalds 5044742120c6SMing Lei ret = usb_reset_device(hdev); 50451da177e4SLinus Torvalds if (ret) { 5046eb6e2924SPetr Mladek dev_dbg(hub_dev, "error resetting hub: %d\n", ret); 5047eb6e2924SPetr Mladek goto out_autopm; 50481da177e4SLinus Torvalds } 50491da177e4SLinus Torvalds 50501da177e4SLinus Torvalds hub->nerrors = 0; 50511da177e4SLinus Torvalds hub->error = 0; 50521da177e4SLinus Torvalds } 50531da177e4SLinus Torvalds 50541da177e4SLinus Torvalds /* deal with port status changes */ 50553bbc47d8SKrzysztof Mazur for (i = 1; i <= hdev->maxchild; i++) { 5056097a155fSDan Williams struct usb_port *port_dev = hub->ports[i - 1]; 5057a82b76f7SHans de Goede 50585c79a1e3SDan Williams if (test_bit(i, hub->event_bits) 5059af376a46SDan Williams || test_bit(i, hub->change_bits) 50605c79a1e3SDan Williams || test_bit(i, hub->wakeup_bits)) { 50611da177e4SLinus Torvalds /* 5062097a155fSDan Williams * The get_noresume and barrier ensure that if 5063097a155fSDan Williams * the port was in the process of resuming, we 5064097a155fSDan Williams * flush that work and keep the port active for 5065097a155fSDan Williams * the duration of the port_event(). However, 5066097a155fSDan Williams * if the port is runtime pm suspended 5067097a155fSDan Williams * (powered-off), we leave it in that state, run 5068097a155fSDan Williams * an abbreviated port_event(), and move on. 50691da177e4SLinus Torvalds */ 5070097a155fSDan Williams pm_runtime_get_noresume(&port_dev->dev); 5071097a155fSDan Williams pm_runtime_barrier(&port_dev->dev); 50725c79a1e3SDan Williams usb_lock_port(port_dev); 5073af376a46SDan Williams port_event(hub, i); 50745c79a1e3SDan Williams usb_unlock_port(port_dev); 5075097a155fSDan Williams pm_runtime_put_sync(&port_dev->dev); 50761da177e4SLinus Torvalds } 50771da177e4SLinus Torvalds } 50781da177e4SLinus Torvalds 50791da177e4SLinus Torvalds /* deal with hub status changes */ 50801da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 50811da177e4SLinus Torvalds ; /* do nothing */ 50821da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 50831da177e4SLinus Torvalds dev_err(hub_dev, "get_hub_status failed\n"); 50841da177e4SLinus Torvalds else { 50851da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 50861da177e4SLinus Torvalds dev_dbg(hub_dev, "power change\n"); 50871da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 508855c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 508955c52718SAlan Stern /* FIXME: Is this always true? */ 509055c52718SAlan Stern hub->limited_power = 1; 5091403fae78Sjidong xiao else 5092403fae78Sjidong xiao hub->limited_power = 0; 50931da177e4SLinus Torvalds } 50941da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 5095752d57a8SPaul Bolle u16 status = 0; 5096752d57a8SPaul Bolle u16 unused; 5097752d57a8SPaul Bolle 5098752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change\n"); 50991da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 5100752d57a8SPaul Bolle msleep(500); /* Cool down */ 51018520f380SAlan Stern hub_power_on(hub, true); 5102752d57a8SPaul Bolle hub_hub_status(hub, &status, &unused); 5103752d57a8SPaul Bolle if (status & HUB_STATUS_OVERCURRENT) 5104eb6e2924SPetr Mladek dev_err(hub_dev, "over-current condition\n"); 51051da177e4SLinus Torvalds } 51061da177e4SLinus Torvalds } 51071da177e4SLinus Torvalds 5108eb6e2924SPetr Mladek out_autopm: 51098e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface() above */ 51108e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 511132a69589SPetr Mladek out_hdev_lock: 51121da177e4SLinus Torvalds usb_unlock_device(hdev); 511332a69589SPetr Mladek 511432a69589SPetr Mladek /* Balance the stuff in kick_hub_wq() and allow autosuspend */ 511532a69589SPetr Mladek usb_autopm_put_interface(intf); 5116e8054854SAlan Stern kref_put(&hub->kref, hub_release); 51171da177e4SLinus Torvalds } 51181da177e4SLinus Torvalds 51191e927d96SNémeth Márton static const struct usb_device_id hub_id_table[] = { 5120e6f30deaSMing Lei { .match_flags = USB_DEVICE_ID_MATCH_VENDOR 5121e6f30deaSMing Lei | USB_DEVICE_ID_MATCH_INT_CLASS, 5122e6f30deaSMing Lei .idVendor = USB_VENDOR_GENESYS_LOGIC, 5123e6f30deaSMing Lei .bInterfaceClass = USB_CLASS_HUB, 5124e6f30deaSMing Lei .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, 51251da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 51261da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 51271da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 51281da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 51291da177e4SLinus Torvalds { } /* Terminating entry */ 51301da177e4SLinus Torvalds }; 51311da177e4SLinus Torvalds 51321da177e4SLinus Torvalds MODULE_DEVICE_TABLE(usb, hub_id_table); 51331da177e4SLinus Torvalds 51341da177e4SLinus Torvalds static struct usb_driver hub_driver = { 51351da177e4SLinus Torvalds .name = "hub", 51361da177e4SLinus Torvalds .probe = hub_probe, 51371da177e4SLinus Torvalds .disconnect = hub_disconnect, 51381da177e4SLinus Torvalds .suspend = hub_suspend, 51391da177e4SLinus Torvalds .resume = hub_resume, 5140f07600cfSAlan Stern .reset_resume = hub_reset_resume, 51417de18d8bSAlan Stern .pre_reset = hub_pre_reset, 51427de18d8bSAlan Stern .post_reset = hub_post_reset, 5143c532b29aSAndi Kleen .unlocked_ioctl = hub_ioctl, 51441da177e4SLinus Torvalds .id_table = hub_id_table, 514540f122f3SAlan Stern .supports_autosuspend = 1, 51461da177e4SLinus Torvalds }; 51471da177e4SLinus Torvalds 51481da177e4SLinus Torvalds int usb_hub_init(void) 51491da177e4SLinus Torvalds { 51501da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 51511da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 51521da177e4SLinus Torvalds usbcore_name); 51531da177e4SLinus Torvalds return -1; 51541da177e4SLinus Torvalds } 51551da177e4SLinus Torvalds 515632a69589SPetr Mladek /* 515732a69589SPetr Mladek * The workqueue needs to be freezable to avoid interfering with 515832a69589SPetr Mladek * USB-PERSIST port handover. Otherwise it might see that a full-speed 515932a69589SPetr Mladek * device was gone before the EHCI controller had handed its port 516032a69589SPetr Mladek * over to the companion full-speed controller. 516132a69589SPetr Mladek */ 5162638139ebSPetr Mladek hub_wq = alloc_workqueue("usb_hub_wq", WQ_FREEZABLE, 0); 516332a69589SPetr Mladek if (hub_wq) 51641da177e4SLinus Torvalds return 0; 51651da177e4SLinus Torvalds 51661da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 51671da177e4SLinus Torvalds usb_deregister(&hub_driver); 516832a69589SPetr Mladek pr_err("%s: can't allocate workqueue for usb hub\n", usbcore_name); 51691da177e4SLinus Torvalds 51701da177e4SLinus Torvalds return -1; 51711da177e4SLinus Torvalds } 51721da177e4SLinus Torvalds 51731da177e4SLinus Torvalds void usb_hub_cleanup(void) 51741da177e4SLinus Torvalds { 517532a69589SPetr Mladek destroy_workqueue(hub_wq); 51761da177e4SLinus Torvalds 51771da177e4SLinus Torvalds /* 51781da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 51791da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 51801da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 51811da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 51821da177e4SLinus Torvalds * individual hub resources. -greg 51831da177e4SLinus Torvalds */ 51841da177e4SLinus Torvalds usb_deregister(&hub_driver); 51851da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 51861da177e4SLinus Torvalds 5187eb764c4bSAlan Stern static int descriptors_changed(struct usb_device *udev, 5188e3376d6cSXenia Ragiadakou struct usb_device_descriptor *old_device_descriptor, 5189e3376d6cSXenia Ragiadakou struct usb_host_bos *old_bos) 51901da177e4SLinus Torvalds { 5191eb764c4bSAlan Stern int changed = 0; 51921da177e4SLinus Torvalds unsigned index; 5193eb764c4bSAlan Stern unsigned serial_len = 0; 5194eb764c4bSAlan Stern unsigned len; 5195eb764c4bSAlan Stern unsigned old_length; 5196eb764c4bSAlan Stern int length; 5197eb764c4bSAlan Stern char *buf; 51981da177e4SLinus Torvalds 5199eb764c4bSAlan Stern if (memcmp(&udev->descriptor, old_device_descriptor, 5200eb764c4bSAlan Stern sizeof(*old_device_descriptor)) != 0) 5201eb764c4bSAlan Stern return 1; 5202eb764c4bSAlan Stern 5203e3376d6cSXenia Ragiadakou if ((old_bos && !udev->bos) || (!old_bos && udev->bos)) 5204e3376d6cSXenia Ragiadakou return 1; 5205e3376d6cSXenia Ragiadakou if (udev->bos) { 5206b9a10481SXenia Ragiadakou len = le16_to_cpu(udev->bos->desc->wTotalLength); 5207b9a10481SXenia Ragiadakou if (len != le16_to_cpu(old_bos->desc->wTotalLength)) 5208e3376d6cSXenia Ragiadakou return 1; 5209b9a10481SXenia Ragiadakou if (memcmp(udev->bos->desc, old_bos->desc, len)) 5210e3376d6cSXenia Ragiadakou return 1; 5211e3376d6cSXenia Ragiadakou } 5212e3376d6cSXenia Ragiadakou 5213eb764c4bSAlan Stern /* Since the idVendor, idProduct, and bcdDevice values in the 5214eb764c4bSAlan Stern * device descriptor haven't changed, we will assume the 5215eb764c4bSAlan Stern * Manufacturer and Product strings haven't changed either. 5216eb764c4bSAlan Stern * But the SerialNumber string could be different (e.g., a 5217eb764c4bSAlan Stern * different flash card of the same brand). 5218eb764c4bSAlan Stern */ 5219eb764c4bSAlan Stern if (udev->serial) 5220eb764c4bSAlan Stern serial_len = strlen(udev->serial) + 1; 5221eb764c4bSAlan Stern 5222eb764c4bSAlan Stern len = serial_len; 52231da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 5224eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 5225eb764c4bSAlan Stern len = max(len, old_length); 52261da177e4SLinus Torvalds } 5227eb764c4bSAlan Stern 52280cc1a51fSOliver Neukum buf = kmalloc(len, GFP_NOIO); 52291da177e4SLinus Torvalds if (buf == NULL) { 52301da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 52311da177e4SLinus Torvalds /* assume the worst */ 52321da177e4SLinus Torvalds return 1; 52331da177e4SLinus Torvalds } 52341da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 5235eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 52361da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 52371da177e4SLinus Torvalds old_length); 5238eb764c4bSAlan Stern if (length != old_length) { 52391da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 52401da177e4SLinus Torvalds index, length); 5241eb764c4bSAlan Stern changed = 1; 52421da177e4SLinus Torvalds break; 52431da177e4SLinus Torvalds } 52441da177e4SLinus Torvalds if (memcmp(buf, udev->rawdescriptors[index], old_length) 52451da177e4SLinus Torvalds != 0) { 52461da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 5247eb764c4bSAlan Stern index, 5248eb764c4bSAlan Stern ((struct usb_config_descriptor *) buf)-> 5249eb764c4bSAlan Stern bConfigurationValue); 5250eb764c4bSAlan Stern changed = 1; 52511da177e4SLinus Torvalds break; 52521da177e4SLinus Torvalds } 52531da177e4SLinus Torvalds } 5254eb764c4bSAlan Stern 5255eb764c4bSAlan Stern if (!changed && serial_len) { 5256eb764c4bSAlan Stern length = usb_string(udev, udev->descriptor.iSerialNumber, 5257eb764c4bSAlan Stern buf, serial_len); 5258eb764c4bSAlan Stern if (length + 1 != serial_len) { 5259eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string error %d\n", 5260eb764c4bSAlan Stern length); 5261eb764c4bSAlan Stern changed = 1; 5262eb764c4bSAlan Stern } else if (memcmp(buf, udev->serial, length) != 0) { 5263eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string changed\n"); 5264eb764c4bSAlan Stern changed = 1; 5265eb764c4bSAlan Stern } 5266eb764c4bSAlan Stern } 5267eb764c4bSAlan Stern 52681da177e4SLinus Torvalds kfree(buf); 5269eb764c4bSAlan Stern return changed; 52701da177e4SLinus Torvalds } 52711da177e4SLinus Torvalds 52721da177e4SLinus Torvalds /** 5273742120c6SMing Lei * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device 52741da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 52751da177e4SLinus Torvalds * 527679efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 527779efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 5278742120c6SMing Lei * Use usb_reset_device() instead. 52791da177e4SLinus Torvalds * 52801da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 52811da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 52821da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 52831da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 528437ebb549SPetr Mladek * telling hub_wq to pretend the device has been disconnected and then 52851da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 52861da177e4SLinus Torvalds * re-enumerated and probed all over again. 52871da177e4SLinus Torvalds * 5288626f090cSYacine Belkadi * Return: 0 if the reset succeeded, -ENODEV if the device has been 52891da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 52901da177e4SLinus Torvalds * if the reset wasn't even attempted. 52911da177e4SLinus Torvalds * 5292626f090cSYacine Belkadi * Note: 52935c79a1e3SDan Williams * The caller must own the device lock and the port lock, the latter is 52945c79a1e3SDan Williams * taken by usb_reset_device(). For example, it's safe to use 52955c79a1e3SDan Williams * usb_reset_device() from a driver probe() routine after downloading 52965c79a1e3SDan Williams * new firmware. For calls that might not occur during probe(), drivers 52975c79a1e3SDan Williams * should lock the device using usb_lock_device_for_reset(). 52986bc6cff5SAlan Stern * 52996bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 53006bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 53016bc6cff5SAlan Stern * holding the device lock because these tasks should always call 53025c79a1e3SDan Williams * usb_autopm_resume_device(), thereby preventing any unwanted 53035c79a1e3SDan Williams * autoresume. The autoresume handler is expected to have already 53045c79a1e3SDan Williams * acquired the port lock before calling this routine. 53051da177e4SLinus Torvalds */ 5306742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev) 53071da177e4SLinus Torvalds { 53081da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 53091da177e4SLinus Torvalds struct usb_hub *parent_hub; 53103f0479e0SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 53111da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 5312e3376d6cSXenia Ragiadakou struct usb_host_bos *bos; 53137a7b562dSHans de Goede int i, j, ret = 0; 531412c3da34SAlan Stern int port1 = udev->portnum; 53151da177e4SLinus Torvalds 53161da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 53171da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 53181da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 53191da177e4SLinus Torvalds udev->state); 53201da177e4SLinus Torvalds return -EINVAL; 53211da177e4SLinus Torvalds } 53221da177e4SLinus Torvalds 53235c79a1e3SDan Williams if (!parent_hdev) 53241da177e4SLinus Torvalds return -EISDIR; 53255c79a1e3SDan Williams 5326ad493e5eSLan Tianyu parent_hub = usb_hub_to_struct_hub(parent_hdev); 53271da177e4SLinus Torvalds 5328dcc01c08SSarah Sharp /* Disable USB2 hardware LPM. 5329dcc01c08SSarah Sharp * It will be re-enabled by the enumeration process. 5330dcc01c08SSarah Sharp */ 5331dcc01c08SSarah Sharp if (udev->usb2_hw_lpm_enabled == 1) 5332dcc01c08SSarah Sharp usb_set_usb2_hardware_lpm(udev, 0); 5333dcc01c08SSarah Sharp 5334f74631e3SSarah Sharp /* Disable LPM and LTM while we reset the device and reinstall the alt 5335f74631e3SSarah Sharp * settings. Device-initiated LPM settings, and system exit latency 5336f74631e3SSarah Sharp * settings are cleared when the device is reset, so we have to set 5337f74631e3SSarah Sharp * them up again. 53386d1d0513SSarah Sharp */ 53396d1d0513SSarah Sharp ret = usb_unlocked_disable_lpm(udev); 53406d1d0513SSarah Sharp if (ret) { 53416d1d0513SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__); 5342464ad8c4SHans Yang goto re_enumerate_no_bos; 53436d1d0513SSarah Sharp } 5344f74631e3SSarah Sharp ret = usb_disable_ltm(udev); 5345f74631e3SSarah Sharp if (ret) { 5346f74631e3SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LTM\n.", 5347f74631e3SSarah Sharp __func__); 5348464ad8c4SHans Yang goto re_enumerate_no_bos; 5349f74631e3SSarah Sharp } 53506d1d0513SSarah Sharp 5351464ad8c4SHans Yang bos = udev->bos; 5352464ad8c4SHans Yang udev->bos = NULL; 5353464ad8c4SHans Yang 53541da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 53551da177e4SLinus Torvalds 53561da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 53571da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 5358fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 53591da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 5360dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 53611da177e4SLinus Torvalds break; 53621da177e4SLinus Torvalds } 5363d5cbad4bSAlan Stern 53641da177e4SLinus Torvalds if (ret < 0) 53651da177e4SLinus Torvalds goto re_enumerate; 53661da177e4SLinus Torvalds 53671da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 5368e3376d6cSXenia Ragiadakou if (descriptors_changed(udev, &descriptor, bos)) { 53691da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 53701da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 53711da177e4SLinus Torvalds goto re_enumerate; 53721da177e4SLinus Torvalds } 53731da177e4SLinus Torvalds 53744fe0387aSAlan Stern /* Restore the device's previous configuration */ 53751da177e4SLinus Torvalds if (!udev->actconfig) 53761da177e4SLinus Torvalds goto done; 53773f0479e0SSarah Sharp 5378d673bfcbSSarah Sharp mutex_lock(hcd->bandwidth_mutex); 53793f0479e0SSarah Sharp ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); 53803f0479e0SSarah Sharp if (ret < 0) { 53813f0479e0SSarah Sharp dev_warn(&udev->dev, 53823f0479e0SSarah Sharp "Busted HC? Not enough HCD resources for " 53833f0479e0SSarah Sharp "old configuration.\n"); 5384d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 53853f0479e0SSarah Sharp goto re_enumerate; 53863f0479e0SSarah Sharp } 53871da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 53881da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 53891da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 53901da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 53911da177e4SLinus Torvalds if (ret < 0) { 53921da177e4SLinus Torvalds dev_err(&udev->dev, 53931da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 53941da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 5395d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 53961da177e4SLinus Torvalds goto re_enumerate; 53971da177e4SLinus Torvalds } 5398d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 53991da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 54001da177e4SLinus Torvalds 54014fe0387aSAlan Stern /* Put interfaces back into the same altsettings as before. 54024fe0387aSAlan Stern * Don't bother to send the Set-Interface request for interfaces 54034fe0387aSAlan Stern * that were already in altsetting 0; besides being unnecessary, 54044fe0387aSAlan Stern * many devices can't handle it. Instead just reset the host-side 54054fe0387aSAlan Stern * endpoint state. 54064fe0387aSAlan Stern */ 54071da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 54083f0479e0SSarah Sharp struct usb_host_config *config = udev->actconfig; 54093f0479e0SSarah Sharp struct usb_interface *intf = config->interface[i]; 54101da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 54111da177e4SLinus Torvalds 54121da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 54134fe0387aSAlan Stern if (desc->bAlternateSetting == 0) { 54144fe0387aSAlan Stern usb_disable_interface(udev, intf, true); 54154fe0387aSAlan Stern usb_enable_interface(udev, intf, true); 54164fe0387aSAlan Stern ret = 0; 54174fe0387aSAlan Stern } else { 541804a723eaSSarah Sharp /* Let the bandwidth allocation function know that this 541904a723eaSSarah Sharp * device has been reset, and it will have to use 542004a723eaSSarah Sharp * alternate setting 0 as the current alternate setting. 54213f0479e0SSarah Sharp */ 542204a723eaSSarah Sharp intf->resetting_device = 1; 54231da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 54241da177e4SLinus Torvalds desc->bAlternateSetting); 542504a723eaSSarah Sharp intf->resetting_device = 0; 54264fe0387aSAlan Stern } 54271da177e4SLinus Torvalds if (ret < 0) { 54281da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 54291da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 54301da177e4SLinus Torvalds desc->bInterfaceNumber, 54311da177e4SLinus Torvalds desc->bAlternateSetting, 54321da177e4SLinus Torvalds ret); 54331da177e4SLinus Torvalds goto re_enumerate; 54341da177e4SLinus Torvalds } 54357a7b562dSHans de Goede /* Resetting also frees any allocated streams */ 54367a7b562dSHans de Goede for (j = 0; j < intf->cur_altsetting->desc.bNumEndpoints; j++) 54377a7b562dSHans de Goede intf->cur_altsetting->endpoint[j].streams = 0; 54381da177e4SLinus Torvalds } 54391da177e4SLinus Torvalds 54401da177e4SLinus Torvalds done: 5441f74631e3SSarah Sharp /* Now that the alt settings are re-installed, enable LTM and LPM. */ 5442de68bab4SSarah Sharp usb_set_usb2_hardware_lpm(udev, 1); 544378d9a487SAlan Stern usb_unlocked_enable_lpm(udev); 5444f74631e3SSarah Sharp usb_enable_ltm(udev); 5445e3376d6cSXenia Ragiadakou usb_release_bos_descriptor(udev); 5446e3376d6cSXenia Ragiadakou udev->bos = bos; 54471da177e4SLinus Torvalds return 0; 54481da177e4SLinus Torvalds 54491da177e4SLinus Torvalds re_enumerate: 5450e3376d6cSXenia Ragiadakou usb_release_bos_descriptor(udev); 5451e3376d6cSXenia Ragiadakou udev->bos = bos; 5452464ad8c4SHans Yang re_enumerate_no_bos: 5453464ad8c4SHans Yang /* LPM state doesn't matter when we're about to destroy the device. */ 5454464ad8c4SHans Yang hub_port_logical_disconnect(parent_hub, port1); 54551da177e4SLinus Torvalds return -ENODEV; 54561da177e4SLinus Torvalds } 54571da177e4SLinus Torvalds 54581da177e4SLinus Torvalds /** 54591da177e4SLinus Torvalds * usb_reset_device - warn interface drivers and perform a USB port reset 54601da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 54611da177e4SLinus Torvalds * 546279efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 546379efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 5464742120c6SMing Lei * the reset is over (using their post_reset method). 546579efa097SAlan Stern * 5466626f090cSYacine Belkadi * Return: The same as for usb_reset_and_verify_device(). 546779efa097SAlan Stern * 5468626f090cSYacine Belkadi * Note: 546979efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 547079efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 547179efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 5472742120c6SMing Lei * the device using usb_lock_device_for_reset(). 547379efa097SAlan Stern * 547479efa097SAlan Stern * If an interface is currently being probed or disconnected, we assume 547579efa097SAlan Stern * its driver knows how to handle resets. For all other interfaces, 547679efa097SAlan Stern * if the driver doesn't have pre_reset and post_reset methods then 547779efa097SAlan Stern * we attempt to unbind it and rebind afterward. 547879efa097SAlan Stern */ 5479742120c6SMing Lei int usb_reset_device(struct usb_device *udev) 548079efa097SAlan Stern { 548179efa097SAlan Stern int ret; 5482852c4b43SAlan Stern int i; 54834d769defSMing Lei unsigned int noio_flag; 54845c79a1e3SDan Williams struct usb_port *port_dev; 548579efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 54865c79a1e3SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 548779efa097SAlan Stern 548879efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 548979efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 549079efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 549179efa097SAlan Stern udev->state); 549279efa097SAlan Stern return -EINVAL; 549379efa097SAlan Stern } 549479efa097SAlan Stern 54955c79a1e3SDan Williams if (!udev->parent) { 54965c79a1e3SDan Williams /* this requires hcd-specific logic; see ohci_restart() */ 54975c79a1e3SDan Williams dev_dbg(&udev->dev, "%s for root hub!\n", __func__); 54985c79a1e3SDan Williams return -EISDIR; 54995c79a1e3SDan Williams } 55005c79a1e3SDan Williams 55015c79a1e3SDan Williams port_dev = hub->ports[udev->portnum - 1]; 55025c79a1e3SDan Williams 55034d769defSMing Lei /* 55044d769defSMing Lei * Don't allocate memory with GFP_KERNEL in current 55054d769defSMing Lei * context to avoid possible deadlock if usb mass 55064d769defSMing Lei * storage interface or usbnet interface(iSCSI case) 55074d769defSMing Lei * is included in current configuration. The easist 55084d769defSMing Lei * approach is to do it for every device reset, 55094d769defSMing Lei * because the device 'memalloc_noio' flag may have 55104d769defSMing Lei * not been set before reseting the usb device. 55114d769defSMing Lei */ 55124d769defSMing Lei noio_flag = memalloc_noio_save(); 55134d769defSMing Lei 5514645daaabSAlan Stern /* Prevent autosuspend during the reset */ 551594fcda1fSAlan Stern usb_autoresume_device(udev); 5516645daaabSAlan Stern 551779efa097SAlan Stern if (config) { 5518852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 5519852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 552079efa097SAlan Stern struct usb_driver *drv; 552178d9a487SAlan Stern int unbind = 0; 552279efa097SAlan Stern 5523852c4b43SAlan Stern if (cintf->dev.driver) { 552479efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 552578d9a487SAlan Stern if (drv->pre_reset && drv->post_reset) 552678d9a487SAlan Stern unbind = (drv->pre_reset)(cintf); 552778d9a487SAlan Stern else if (cintf->condition == 552878d9a487SAlan Stern USB_INTERFACE_BOUND) 552978d9a487SAlan Stern unbind = 1; 553078d9a487SAlan Stern if (unbind) 553178d9a487SAlan Stern usb_forced_unbind_intf(cintf); 553279efa097SAlan Stern } 553379efa097SAlan Stern } 553479efa097SAlan Stern } 553579efa097SAlan Stern 55365c79a1e3SDan Williams usb_lock_port(port_dev); 5537742120c6SMing Lei ret = usb_reset_and_verify_device(udev); 55385c79a1e3SDan Williams usb_unlock_port(port_dev); 553979efa097SAlan Stern 554079efa097SAlan Stern if (config) { 5541852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 5542852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 554379efa097SAlan Stern struct usb_driver *drv; 554478d9a487SAlan Stern int rebind = cintf->needs_binding; 554579efa097SAlan Stern 554678d9a487SAlan Stern if (!rebind && cintf->dev.driver) { 554779efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 554879efa097SAlan Stern if (drv->post_reset) 554978d9a487SAlan Stern rebind = (drv->post_reset)(cintf); 555078d9a487SAlan Stern else if (cintf->condition == 555178d9a487SAlan Stern USB_INTERFACE_BOUND) 555278d9a487SAlan Stern rebind = 1; 55536aec044cSAlan Stern if (rebind) 55546aec044cSAlan Stern cintf->needs_binding = 1; 555579efa097SAlan Stern } 555679efa097SAlan Stern } 55576aec044cSAlan Stern usb_unbind_and_rebind_marked_interfaces(udev); 555879efa097SAlan Stern } 555979efa097SAlan Stern 556094fcda1fSAlan Stern usb_autosuspend_device(udev); 55614d769defSMing Lei memalloc_noio_restore(noio_flag); 556279efa097SAlan Stern return ret; 556379efa097SAlan Stern } 5564742120c6SMing Lei EXPORT_SYMBOL_GPL(usb_reset_device); 5565dc023dceSInaky Perez-Gonzalez 5566dc023dceSInaky Perez-Gonzalez 5567dc023dceSInaky Perez-Gonzalez /** 5568dc023dceSInaky Perez-Gonzalez * usb_queue_reset_device - Reset a USB device from an atomic context 5569dc023dceSInaky Perez-Gonzalez * @iface: USB interface belonging to the device to reset 5570dc023dceSInaky Perez-Gonzalez * 5571dc023dceSInaky Perez-Gonzalez * This function can be used to reset a USB device from an atomic 5572dc023dceSInaky Perez-Gonzalez * context, where usb_reset_device() won't work (as it blocks). 5573dc023dceSInaky Perez-Gonzalez * 5574dc023dceSInaky Perez-Gonzalez * Doing a reset via this method is functionally equivalent to calling 5575dc023dceSInaky Perez-Gonzalez * usb_reset_device(), except for the fact that it is delayed to a 5576dc023dceSInaky Perez-Gonzalez * workqueue. This means that any drivers bound to other interfaces 5577dc023dceSInaky Perez-Gonzalez * might be unbound, as well as users from usbfs in user space. 5578dc023dceSInaky Perez-Gonzalez * 5579dc023dceSInaky Perez-Gonzalez * Corner cases: 5580dc023dceSInaky Perez-Gonzalez * 5581dc023dceSInaky Perez-Gonzalez * - Scheduling two resets at the same time from two different drivers 5582dc023dceSInaky Perez-Gonzalez * attached to two different interfaces of the same device is 5583dc023dceSInaky Perez-Gonzalez * possible; depending on how the driver attached to each interface 5584dc023dceSInaky Perez-Gonzalez * handles ->pre_reset(), the second reset might happen or not. 5585dc023dceSInaky Perez-Gonzalez * 5586524134d4SAlan Stern * - If the reset is delayed so long that the interface is unbound from 5587524134d4SAlan Stern * its driver, the reset will be skipped. 5588dc023dceSInaky Perez-Gonzalez * 5589524134d4SAlan Stern * - This function can be called during .probe(). It can also be called 5590524134d4SAlan Stern * during .disconnect(), but doing so is pointless because the reset 5591524134d4SAlan Stern * will not occur. If you really want to reset the device during 5592524134d4SAlan Stern * .disconnect(), call usb_reset_device() directly -- but watch out 5593524134d4SAlan Stern * for nested unbinding issues! 5594dc023dceSInaky Perez-Gonzalez */ 5595dc023dceSInaky Perez-Gonzalez void usb_queue_reset_device(struct usb_interface *iface) 5596dc023dceSInaky Perez-Gonzalez { 5597524134d4SAlan Stern if (schedule_work(&iface->reset_ws)) 5598524134d4SAlan Stern usb_get_intf(iface); 5599dc023dceSInaky Perez-Gonzalez } 5600dc023dceSInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_queue_reset_device); 5601ff823c79SLan Tianyu 5602ff823c79SLan Tianyu /** 5603ff823c79SLan Tianyu * usb_hub_find_child - Get the pointer of child device 5604ff823c79SLan Tianyu * attached to the port which is specified by @port1. 5605ff823c79SLan Tianyu * @hdev: USB device belonging to the usb hub 5606ff823c79SLan Tianyu * @port1: port num to indicate which port the child device 5607ff823c79SLan Tianyu * is attached to. 5608ff823c79SLan Tianyu * 5609ff823c79SLan Tianyu * USB drivers call this function to get hub's child device 5610ff823c79SLan Tianyu * pointer. 5611ff823c79SLan Tianyu * 5612626f090cSYacine Belkadi * Return: %NULL if input param is invalid and 5613ff823c79SLan Tianyu * child's usb_device pointer if non-NULL. 5614ff823c79SLan Tianyu */ 5615ff823c79SLan Tianyu struct usb_device *usb_hub_find_child(struct usb_device *hdev, 5616ff823c79SLan Tianyu int port1) 5617ff823c79SLan Tianyu { 5618ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5619ff823c79SLan Tianyu 5620ff823c79SLan Tianyu if (port1 < 1 || port1 > hdev->maxchild) 5621ff823c79SLan Tianyu return NULL; 5622ff823c79SLan Tianyu return hub->ports[port1 - 1]->child; 5623ff823c79SLan Tianyu } 5624ff823c79SLan Tianyu EXPORT_SYMBOL_GPL(usb_hub_find_child); 5625d5575424SLan Tianyu 5626d2123fd9SLan Tianyu void usb_hub_adjust_deviceremovable(struct usb_device *hdev, 5627d2123fd9SLan Tianyu struct usb_hub_descriptor *desc) 5628d2123fd9SLan Tianyu { 5629d99f6b41SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5630d2123fd9SLan Tianyu enum usb_port_connect_type connect_type; 5631d2123fd9SLan Tianyu int i; 5632d2123fd9SLan Tianyu 5633d99f6b41SDan Williams if (!hub) 5634d99f6b41SDan Williams return; 5635d99f6b41SDan Williams 5636d2123fd9SLan Tianyu if (!hub_is_superspeed(hdev)) { 5637d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 5638d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[i - 1]; 5639d2123fd9SLan Tianyu 5640d99f6b41SDan Williams connect_type = port_dev->connect_type; 5641d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 5642d2123fd9SLan Tianyu u8 mask = 1 << (i%8); 5643d2123fd9SLan Tianyu 5644d2123fd9SLan Tianyu if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { 5645d99f6b41SDan Williams dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); 5646d2123fd9SLan Tianyu desc->u.hs.DeviceRemovable[i/8] |= mask; 5647d2123fd9SLan Tianyu } 5648d2123fd9SLan Tianyu } 5649d2123fd9SLan Tianyu } 5650d2123fd9SLan Tianyu } else { 5651d2123fd9SLan Tianyu u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); 5652d2123fd9SLan Tianyu 5653d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 5654d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[i - 1]; 5655d2123fd9SLan Tianyu 5656d99f6b41SDan Williams connect_type = port_dev->connect_type; 5657d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 5658d2123fd9SLan Tianyu u16 mask = 1 << i; 5659d2123fd9SLan Tianyu 5660d2123fd9SLan Tianyu if (!(port_removable & mask)) { 5661d99f6b41SDan Williams dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); 5662d2123fd9SLan Tianyu port_removable |= mask; 5663d2123fd9SLan Tianyu } 5664d2123fd9SLan Tianyu } 5665d2123fd9SLan Tianyu } 5666d2123fd9SLan Tianyu 5667d2123fd9SLan Tianyu desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); 5668d2123fd9SLan Tianyu } 5669d2123fd9SLan Tianyu } 5670d2123fd9SLan Tianyu 5671d5575424SLan Tianyu #ifdef CONFIG_ACPI 5672d5575424SLan Tianyu /** 5673d5575424SLan Tianyu * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle 5674d5575424SLan Tianyu * @hdev: USB device belonging to the usb hub 5675d5575424SLan Tianyu * @port1: port num of the port 5676d5575424SLan Tianyu * 5677626f090cSYacine Belkadi * Return: Port's acpi handle if successful, %NULL if params are 5678626f090cSYacine Belkadi * invalid. 5679d5575424SLan Tianyu */ 5680d5575424SLan Tianyu acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, 5681d5575424SLan Tianyu int port1) 5682d5575424SLan Tianyu { 5683ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5684d5575424SLan Tianyu 568541341261SMathias Nyman if (!hub) 568641341261SMathias Nyman return NULL; 568741341261SMathias Nyman 56883a83f992SRafael J. Wysocki return ACPI_HANDLE(&hub->ports[port1 - 1]->dev); 5689d5575424SLan Tianyu } 5690d5575424SLan Tianyu #endif 5691