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 { 127d9b2099cSSarah Sharp /* USB 2.1 (and greater) devices indicate LPM support through 128d9b2099cSSarah Sharp * their USB 2.0 Extended Capabilities BOS descriptor. 129d9b2099cSSarah Sharp */ 130a8425292SRupesh Tatiya if (udev->speed == USB_SPEED_HIGH || udev->speed == USB_SPEED_FULL) { 131d9b2099cSSarah Sharp if (udev->bos->ext_cap && 132d9b2099cSSarah Sharp (USB_LPM_SUPPORT & 133d9b2099cSSarah Sharp le32_to_cpu(udev->bos->ext_cap->bmAttributes))) 134d9b2099cSSarah Sharp return 1; 135d9b2099cSSarah Sharp return 0; 136d9b2099cSSarah Sharp } 13751e0a012SSarah Sharp 13825cd2882SSarah Sharp /* 13925cd2882SSarah Sharp * According to the USB 3.0 spec, all USB 3.0 devices must support LPM. 14025cd2882SSarah Sharp * However, there are some that don't, and they set the U1/U2 exit 14125cd2882SSarah Sharp * latencies to zero. 14251e0a012SSarah Sharp */ 14351e0a012SSarah Sharp if (!udev->bos->ss_cap) { 14425cd2882SSarah Sharp dev_info(&udev->dev, "No LPM exit latency info found, disabling LPM.\n"); 145d9b2099cSSarah Sharp return 0; 146d9b2099cSSarah Sharp } 14751e0a012SSarah Sharp 14825cd2882SSarah Sharp if (udev->bos->ss_cap->bU1devExitLat == 0 && 14925cd2882SSarah Sharp udev->bos->ss_cap->bU2DevExitLat == 0) { 15025cd2882SSarah Sharp if (udev->parent) 15125cd2882SSarah Sharp dev_info(&udev->dev, "LPM exit latency is zeroed, disabling LPM.\n"); 15225cd2882SSarah Sharp else 15325cd2882SSarah Sharp dev_info(&udev->dev, "We don't know the algorithms for LPM for this host, disabling LPM.\n"); 15425cd2882SSarah Sharp return 0; 15525cd2882SSarah Sharp } 15625cd2882SSarah Sharp 15725cd2882SSarah Sharp if (!udev->parent || udev->parent->lpm_capable) 15825cd2882SSarah Sharp return 1; 15951e0a012SSarah Sharp return 0; 16051e0a012SSarah Sharp } 16151e0a012SSarah Sharp 16251e0a012SSarah Sharp /* 16351e0a012SSarah Sharp * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from 16451e0a012SSarah Sharp * either U1 or U2. 16551e0a012SSarah Sharp */ 16651e0a012SSarah Sharp static void usb_set_lpm_mel(struct usb_device *udev, 16751e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 16851e0a012SSarah Sharp unsigned int udev_exit_latency, 16951e0a012SSarah Sharp struct usb_hub *hub, 17051e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 17151e0a012SSarah Sharp unsigned int hub_exit_latency) 17251e0a012SSarah Sharp { 17351e0a012SSarah Sharp unsigned int total_mel; 17451e0a012SSarah Sharp unsigned int device_mel; 17551e0a012SSarah Sharp unsigned int hub_mel; 17651e0a012SSarah Sharp 17751e0a012SSarah Sharp /* 17851e0a012SSarah Sharp * Calculate the time it takes to transition all links from the roothub 17951e0a012SSarah Sharp * to the parent hub into U0. The parent hub must then decode the 18051e0a012SSarah Sharp * packet (hub header decode latency) to figure out which port it was 18151e0a012SSarah Sharp * bound for. 18251e0a012SSarah Sharp * 18351e0a012SSarah Sharp * The Hub Header decode latency is expressed in 0.1us intervals (0x1 18451e0a012SSarah Sharp * means 0.1us). Multiply that by 100 to get nanoseconds. 18551e0a012SSarah Sharp */ 18651e0a012SSarah Sharp total_mel = hub_lpm_params->mel + 18751e0a012SSarah Sharp (hub->descriptor->u.ss.bHubHdrDecLat * 100); 18851e0a012SSarah Sharp 18951e0a012SSarah Sharp /* 19051e0a012SSarah Sharp * How long will it take to transition the downstream hub's port into 19151e0a012SSarah Sharp * U0? The greater of either the hub exit latency or the device exit 19251e0a012SSarah Sharp * latency. 19351e0a012SSarah Sharp * 19451e0a012SSarah Sharp * The BOS U1/U2 exit latencies are expressed in 1us intervals. 19551e0a012SSarah Sharp * Multiply that by 1000 to get nanoseconds. 19651e0a012SSarah Sharp */ 19751e0a012SSarah Sharp device_mel = udev_exit_latency * 1000; 19851e0a012SSarah Sharp hub_mel = hub_exit_latency * 1000; 19951e0a012SSarah Sharp if (device_mel > hub_mel) 20051e0a012SSarah Sharp total_mel += device_mel; 20151e0a012SSarah Sharp else 20251e0a012SSarah Sharp total_mel += hub_mel; 20351e0a012SSarah Sharp 20451e0a012SSarah Sharp udev_lpm_params->mel = total_mel; 20551e0a012SSarah Sharp } 20651e0a012SSarah Sharp 20751e0a012SSarah Sharp /* 20851e0a012SSarah Sharp * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate 20951e0a012SSarah Sharp * a transition from either U1 or U2. 21051e0a012SSarah Sharp */ 21151e0a012SSarah Sharp static void usb_set_lpm_pel(struct usb_device *udev, 21251e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 21351e0a012SSarah Sharp unsigned int udev_exit_latency, 21451e0a012SSarah Sharp struct usb_hub *hub, 21551e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 21651e0a012SSarah Sharp unsigned int hub_exit_latency, 21751e0a012SSarah Sharp unsigned int port_to_port_exit_latency) 21851e0a012SSarah Sharp { 21951e0a012SSarah Sharp unsigned int first_link_pel; 22051e0a012SSarah Sharp unsigned int hub_pel; 22151e0a012SSarah Sharp 22251e0a012SSarah Sharp /* 22351e0a012SSarah Sharp * First, the device sends an LFPS to transition the link between the 22451e0a012SSarah Sharp * device and the parent hub into U0. The exit latency is the bigger of 22551e0a012SSarah Sharp * the device exit latency or the hub exit latency. 22651e0a012SSarah Sharp */ 22751e0a012SSarah Sharp if (udev_exit_latency > hub_exit_latency) 22851e0a012SSarah Sharp first_link_pel = udev_exit_latency * 1000; 22951e0a012SSarah Sharp else 23051e0a012SSarah Sharp first_link_pel = hub_exit_latency * 1000; 23151e0a012SSarah Sharp 23251e0a012SSarah Sharp /* 23351e0a012SSarah Sharp * When the hub starts to receive the LFPS, there is a slight delay for 23451e0a012SSarah Sharp * it to figure out that one of the ports is sending an LFPS. Then it 23551e0a012SSarah Sharp * will forward the LFPS to its upstream link. The exit latency is the 23651e0a012SSarah Sharp * delay, plus the PEL that we calculated for this hub. 23751e0a012SSarah Sharp */ 23851e0a012SSarah Sharp hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel; 23951e0a012SSarah Sharp 24051e0a012SSarah Sharp /* 24151e0a012SSarah Sharp * According to figure C-7 in the USB 3.0 spec, the PEL for this device 24251e0a012SSarah Sharp * is the greater of the two exit latencies. 24351e0a012SSarah Sharp */ 24451e0a012SSarah Sharp if (first_link_pel > hub_pel) 24551e0a012SSarah Sharp udev_lpm_params->pel = first_link_pel; 24651e0a012SSarah Sharp else 24751e0a012SSarah Sharp udev_lpm_params->pel = hub_pel; 24851e0a012SSarah Sharp } 24951e0a012SSarah Sharp 25051e0a012SSarah Sharp /* 25151e0a012SSarah Sharp * Set the System Exit Latency (SEL) to indicate the total worst-case time from 25251e0a012SSarah Sharp * when a device initiates a transition to U0, until when it will receive the 25351e0a012SSarah Sharp * first packet from the host controller. 25451e0a012SSarah Sharp * 25551e0a012SSarah Sharp * Section C.1.5.1 describes the four components to this: 25651e0a012SSarah Sharp * - t1: device PEL 25751e0a012SSarah Sharp * - t2: time for the ERDY to make it from the device to the host. 25851e0a012SSarah Sharp * - t3: a host-specific delay to process the ERDY. 25951e0a012SSarah Sharp * - t4: time for the packet to make it from the host to the device. 26051e0a012SSarah Sharp * 26151e0a012SSarah Sharp * t3 is specific to both the xHCI host and the platform the host is integrated 26251e0a012SSarah Sharp * into. The Intel HW folks have said it's negligible, FIXME if a different 26351e0a012SSarah Sharp * vendor says otherwise. 26451e0a012SSarah Sharp */ 26551e0a012SSarah Sharp static void usb_set_lpm_sel(struct usb_device *udev, 26651e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params) 26751e0a012SSarah Sharp { 26851e0a012SSarah Sharp struct usb_device *parent; 26951e0a012SSarah Sharp unsigned int num_hubs; 27051e0a012SSarah Sharp unsigned int total_sel; 27151e0a012SSarah Sharp 27251e0a012SSarah Sharp /* t1 = device PEL */ 27351e0a012SSarah Sharp total_sel = udev_lpm_params->pel; 27451e0a012SSarah Sharp /* How many external hubs are in between the device & the root port. */ 27551e0a012SSarah Sharp for (parent = udev->parent, num_hubs = 0; parent->parent; 27651e0a012SSarah Sharp parent = parent->parent) 27751e0a012SSarah Sharp num_hubs++; 27851e0a012SSarah Sharp /* t2 = 2.1us + 250ns * (num_hubs - 1) */ 27951e0a012SSarah Sharp if (num_hubs > 0) 28051e0a012SSarah Sharp total_sel += 2100 + 250 * (num_hubs - 1); 28151e0a012SSarah Sharp 28251e0a012SSarah Sharp /* t4 = 250ns * num_hubs */ 28351e0a012SSarah Sharp total_sel += 250 * num_hubs; 28451e0a012SSarah Sharp 28551e0a012SSarah Sharp udev_lpm_params->sel = total_sel; 28651e0a012SSarah Sharp } 28751e0a012SSarah Sharp 28851e0a012SSarah Sharp static void usb_set_lpm_parameters(struct usb_device *udev) 28951e0a012SSarah Sharp { 29051e0a012SSarah Sharp struct usb_hub *hub; 29151e0a012SSarah Sharp unsigned int port_to_port_delay; 29251e0a012SSarah Sharp unsigned int udev_u1_del; 29351e0a012SSarah Sharp unsigned int udev_u2_del; 29451e0a012SSarah Sharp unsigned int hub_u1_del; 29551e0a012SSarah Sharp unsigned int hub_u2_del; 29651e0a012SSarah Sharp 29751e0a012SSarah Sharp if (!udev->lpm_capable || udev->speed != USB_SPEED_SUPER) 29851e0a012SSarah Sharp return; 29951e0a012SSarah Sharp 300ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 30151e0a012SSarah Sharp /* It doesn't take time to transition the roothub into U0, since it 30251e0a012SSarah Sharp * doesn't have an upstream link. 30351e0a012SSarah Sharp */ 30451e0a012SSarah Sharp if (!hub) 30551e0a012SSarah Sharp return; 30651e0a012SSarah Sharp 30751e0a012SSarah Sharp udev_u1_del = udev->bos->ss_cap->bU1devExitLat; 3084d967995SXenia Ragiadakou udev_u2_del = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat); 30951e0a012SSarah Sharp hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat; 3104d967995SXenia Ragiadakou hub_u2_del = le16_to_cpu(udev->parent->bos->ss_cap->bU2DevExitLat); 31151e0a012SSarah Sharp 31251e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del, 31351e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del); 31451e0a012SSarah Sharp 31551e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del, 31651e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del); 31751e0a012SSarah Sharp 31851e0a012SSarah Sharp /* 31951e0a012SSarah Sharp * Appendix C, section C.2.2.2, says that there is a slight delay from 32051e0a012SSarah Sharp * when the parent hub notices the downstream port is trying to 32151e0a012SSarah Sharp * transition to U0 to when the hub initiates a U0 transition on its 32251e0a012SSarah Sharp * upstream port. The section says the delays are tPort2PortU1EL and 32351e0a012SSarah Sharp * tPort2PortU2EL, but it doesn't define what they are. 32451e0a012SSarah Sharp * 32551e0a012SSarah Sharp * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking 32651e0a012SSarah Sharp * about the same delays. Use the maximum delay calculations from those 32751e0a012SSarah Sharp * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For 32851e0a012SSarah Sharp * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I 32951e0a012SSarah Sharp * assume the device exit latencies they are talking about are the hub 33051e0a012SSarah Sharp * exit latencies. 33151e0a012SSarah Sharp * 33251e0a012SSarah Sharp * What do we do if the U2 exit latency is less than the U1 exit 33351e0a012SSarah Sharp * latency? It's possible, although not likely... 33451e0a012SSarah Sharp */ 33551e0a012SSarah Sharp port_to_port_delay = 1; 33651e0a012SSarah Sharp 33751e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del, 33851e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del, 33951e0a012SSarah Sharp port_to_port_delay); 34051e0a012SSarah Sharp 34151e0a012SSarah Sharp if (hub_u2_del > hub_u1_del) 34251e0a012SSarah Sharp port_to_port_delay = 1 + hub_u2_del - hub_u1_del; 34351e0a012SSarah Sharp else 34451e0a012SSarah Sharp port_to_port_delay = 1 + hub_u1_del; 34551e0a012SSarah Sharp 34651e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del, 34751e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del, 34851e0a012SSarah Sharp port_to_port_delay); 34951e0a012SSarah Sharp 35051e0a012SSarah Sharp /* Now that we've got PEL, calculate SEL. */ 35151e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u1_params); 35251e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u2_params); 35351e0a012SSarah Sharp } 354d9b2099cSSarah Sharp 3551da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 356dbe79bbeSJohn Youn static int get_hub_descriptor(struct usb_device *hdev, void *data) 3571da177e4SLinus Torvalds { 358dbe79bbeSJohn Youn int i, ret, size; 359dbe79bbeSJohn Youn unsigned dtype; 360dbe79bbeSJohn Youn 361dbe79bbeSJohn Youn if (hub_is_superspeed(hdev)) { 362dbe79bbeSJohn Youn dtype = USB_DT_SS_HUB; 363dbe79bbeSJohn Youn size = USB_DT_SS_HUB_SIZE; 364dbe79bbeSJohn Youn } else { 365dbe79bbeSJohn Youn dtype = USB_DT_HUB; 366dbe79bbeSJohn Youn size = sizeof(struct usb_hub_descriptor); 367dbe79bbeSJohn Youn } 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 3701da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3711da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 372dbe79bbeSJohn Youn dtype << 8, 0, data, size, 3731da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 3741da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 3751da177e4SLinus Torvalds return ret; 3761da177e4SLinus Torvalds } 3771da177e4SLinus Torvalds return -EINVAL; 3781da177e4SLinus Torvalds } 3791da177e4SLinus Torvalds 3801da177e4SLinus Torvalds /* 3811da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 3821da177e4SLinus Torvalds */ 3831da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 3841da177e4SLinus Torvalds { 3851da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 3861da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 3871da177e4SLinus Torvalds } 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds /* 3901da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 3911da177e4SLinus Torvalds */ 392ad493e5eSLan Tianyu int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature) 3931da177e4SLinus Torvalds { 3941da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 3951da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 3961da177e4SLinus Torvalds NULL, 0, 1000); 3971da177e4SLinus Torvalds } 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds /* 4001da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 4011da177e4SLinus Torvalds */ 4021da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 4031da177e4SLinus Torvalds { 4041da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4051da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 4061da177e4SLinus Torvalds NULL, 0, 1000); 4071da177e4SLinus Torvalds } 4081da177e4SLinus Torvalds 409d99f6b41SDan Williams static char *to_led_name(int selector) 410d99f6b41SDan Williams { 411d99f6b41SDan Williams switch (selector) { 412d99f6b41SDan Williams case HUB_LED_AMBER: 413d99f6b41SDan Williams return "amber"; 414d99f6b41SDan Williams case HUB_LED_GREEN: 415d99f6b41SDan Williams return "green"; 416d99f6b41SDan Williams case HUB_LED_OFF: 417d99f6b41SDan Williams return "off"; 418d99f6b41SDan Williams case HUB_LED_AUTO: 419d99f6b41SDan Williams return "auto"; 420d99f6b41SDan Williams default: 421d99f6b41SDan Williams return "??"; 422d99f6b41SDan Williams } 423d99f6b41SDan Williams } 424d99f6b41SDan Williams 4251da177e4SLinus Torvalds /* 4261da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 4271da177e4SLinus Torvalds * for info about using port indicators 4281da177e4SLinus Torvalds */ 429d99f6b41SDan Williams static void set_port_led(struct usb_hub *hub, int port1, int selector) 4301da177e4SLinus Torvalds { 431d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 432d99f6b41SDan Williams int status; 433d99f6b41SDan Williams 434d99f6b41SDan Williams status = set_port_feature(hub->hdev, (selector << 8) | port1, 4351da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 436d99f6b41SDan Williams dev_dbg(&port_dev->dev, "indicator %s status %d\n", 437d99f6b41SDan Williams to_led_name(selector), status); 4381da177e4SLinus Torvalds } 4391da177e4SLinus Torvalds 4401da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 4411da177e4SLinus Torvalds 442c4028958SDavid Howells static void led_work(struct work_struct *work) 4431da177e4SLinus Torvalds { 444c4028958SDavid Howells struct usb_hub *hub = 445c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 4461da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4471da177e4SLinus Torvalds unsigned i; 4481da177e4SLinus Torvalds unsigned changed = 0; 4491da177e4SLinus Torvalds int cursor = -1; 4501da177e4SLinus Torvalds 4511da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 4521da177e4SLinus Torvalds return; 4531da177e4SLinus Torvalds 4543bbc47d8SKrzysztof Mazur for (i = 0; i < hdev->maxchild; i++) { 4551da177e4SLinus Torvalds unsigned selector, mode; 4561da177e4SLinus Torvalds 4571da177e4SLinus Torvalds /* 30%-50% duty cycle */ 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds switch (hub->indicator[i]) { 4601da177e4SLinus Torvalds /* cycle marker */ 4611da177e4SLinus Torvalds case INDICATOR_CYCLE: 4621da177e4SLinus Torvalds cursor = i; 4631da177e4SLinus Torvalds selector = HUB_LED_AUTO; 4641da177e4SLinus Torvalds mode = INDICATOR_AUTO; 4651da177e4SLinus Torvalds break; 4661da177e4SLinus Torvalds /* blinking green = sw attention */ 4671da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 4681da177e4SLinus Torvalds selector = HUB_LED_GREEN; 4691da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 4701da177e4SLinus Torvalds break; 4711da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 4721da177e4SLinus Torvalds selector = HUB_LED_OFF; 4731da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 4741da177e4SLinus Torvalds break; 4751da177e4SLinus Torvalds /* blinking amber = hw attention */ 4761da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 4771da177e4SLinus Torvalds selector = HUB_LED_AMBER; 4781da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 4791da177e4SLinus Torvalds break; 4801da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 4811da177e4SLinus Torvalds selector = HUB_LED_OFF; 4821da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 4831da177e4SLinus Torvalds break; 4841da177e4SLinus Torvalds /* blink green/amber = reserved */ 4851da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 4861da177e4SLinus Torvalds selector = HUB_LED_GREEN; 4871da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 4881da177e4SLinus Torvalds break; 4891da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 4901da177e4SLinus Torvalds selector = HUB_LED_AMBER; 4911da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 4921da177e4SLinus Torvalds break; 4931da177e4SLinus Torvalds default: 4941da177e4SLinus Torvalds continue; 4951da177e4SLinus Torvalds } 4961da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 4971da177e4SLinus Torvalds changed = 1; 4981da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 4991da177e4SLinus Torvalds hub->indicator[i] = mode; 5001da177e4SLinus Torvalds } 5011da177e4SLinus Torvalds if (!changed && blinkenlights) { 5021da177e4SLinus Torvalds cursor++; 5033bbc47d8SKrzysztof Mazur cursor %= hdev->maxchild; 5041da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 5051da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 5061da177e4SLinus Torvalds changed++; 5071da177e4SLinus Torvalds } 5081da177e4SLinus Torvalds if (changed) 50922f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 51022f6a0f0SShaibal Dutta &hub->leds, LED_CYCLE_PERIOD); 5111da177e4SLinus Torvalds } 5121da177e4SLinus Torvalds 5131da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 5141da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 5151da177e4SLinus Torvalds #define USB_STS_RETRIES 5 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds /* 5181da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 5191da177e4SLinus Torvalds */ 5201da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 5211da177e4SLinus Torvalds struct usb_hub_status *data) 5221da177e4SLinus Torvalds { 5231da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5241da177e4SLinus Torvalds 5253824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 5263824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 5271da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 5281da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 5291da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 5301da177e4SLinus Torvalds } 5311da177e4SLinus Torvalds return status; 5321da177e4SLinus Torvalds } 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds /* 5351da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 5361da177e4SLinus Torvalds */ 5371da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 5381da177e4SLinus Torvalds struct usb_port_status *data) 5391da177e4SLinus Torvalds { 5401da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5411da177e4SLinus Torvalds 5423824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 5433824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 5441da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 5451da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 5461da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 5471da177e4SLinus Torvalds } 5481da177e4SLinus Torvalds return status; 5491da177e4SLinus Torvalds } 5501da177e4SLinus Torvalds 5513eb14915SAlan Stern static int hub_port_status(struct usb_hub *hub, int port1, 5523eb14915SAlan Stern u16 *status, u16 *change) 5533eb14915SAlan Stern { 5543eb14915SAlan Stern int ret; 5553eb14915SAlan Stern 5563eb14915SAlan Stern mutex_lock(&hub->status_mutex); 5573eb14915SAlan Stern ret = get_port_status(hub->hdev, port1, &hub->status->port); 5583eb14915SAlan Stern if (ret < 4) { 559e9e88fb7SAlan Stern if (ret != -ENODEV) 5603eb14915SAlan Stern dev_err(hub->intfdev, 5613eb14915SAlan Stern "%s failed (err = %d)\n", __func__, ret); 5623eb14915SAlan Stern if (ret >= 0) 5633eb14915SAlan Stern ret = -EIO; 5643eb14915SAlan Stern } else { 5653eb14915SAlan Stern *status = le16_to_cpu(hub->status->port.wPortStatus); 5663eb14915SAlan Stern *change = le16_to_cpu(hub->status->port.wPortChange); 567dbe79bbeSJohn Youn 5683eb14915SAlan Stern ret = 0; 5693eb14915SAlan Stern } 5703eb14915SAlan Stern mutex_unlock(&hub->status_mutex); 5713eb14915SAlan Stern return ret; 5723eb14915SAlan Stern } 5733eb14915SAlan Stern 57432a69589SPetr Mladek static void kick_hub_wq(struct usb_hub *hub) 5751da177e4SLinus Torvalds { 57632a69589SPetr Mladek struct usb_interface *intf; 5771da177e4SLinus Torvalds 57832a69589SPetr Mladek if (hub->disconnected || work_pending(&hub->events)) 57932a69589SPetr Mladek return; 5808e4ceb38SAlan Stern 58132a69589SPetr Mladek /* 58232a69589SPetr Mladek * Suppress autosuspend until the event is proceed. 58332a69589SPetr Mladek * 58432a69589SPetr Mladek * Be careful and make sure that the symmetric operation is 58532a69589SPetr Mladek * always called. We are here only when there is no pending 58632a69589SPetr Mladek * work for this hub. Therefore put the interface either when 58732a69589SPetr Mladek * the new work is called or when it is canceled. 58832a69589SPetr Mladek */ 58932a69589SPetr Mladek intf = to_usb_interface(hub->intfdev); 59032a69589SPetr Mladek usb_autopm_get_interface_no_resume(intf); 59132a69589SPetr Mladek kref_get(&hub->kref); 59232a69589SPetr Mladek 59332a69589SPetr Mladek if (queue_work(hub_wq, &hub->events)) 59432a69589SPetr Mladek return; 59532a69589SPetr Mladek 59632a69589SPetr Mladek /* the work has already been scheduled */ 59732a69589SPetr Mladek usb_autopm_put_interface_async(intf); 59832a69589SPetr Mladek kref_put(&hub->kref, hub_release); 5991da177e4SLinus Torvalds } 6001da177e4SLinus Torvalds 60159d48b3fSPetr Mladek void usb_kick_hub_wq(struct usb_device *hdev) 6021da177e4SLinus Torvalds { 603ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 60425118084SAlan Stern 60525118084SAlan Stern if (hub) 60632a69589SPetr Mladek kick_hub_wq(hub); 6071da177e4SLinus Torvalds } 6081da177e4SLinus Torvalds 6094ee823b8SSarah Sharp /* 6104ee823b8SSarah Sharp * Let the USB core know that a USB 3.0 device has sent a Function Wake Device 6114ee823b8SSarah Sharp * Notification, which indicates it had initiated remote wakeup. 6124ee823b8SSarah Sharp * 6134ee823b8SSarah Sharp * USB 3.0 hubs do not report the port link state change from U3 to U0 when the 6144ee823b8SSarah Sharp * device initiates resume, so the USB core will not receive notice of the 6154ee823b8SSarah Sharp * resume through the normal hub interrupt URB. 6164ee823b8SSarah Sharp */ 6174ee823b8SSarah Sharp void usb_wakeup_notification(struct usb_device *hdev, 6184ee823b8SSarah Sharp unsigned int portnum) 6194ee823b8SSarah Sharp { 6204ee823b8SSarah Sharp struct usb_hub *hub; 6214ee823b8SSarah Sharp 6224ee823b8SSarah Sharp if (!hdev) 6234ee823b8SSarah Sharp return; 6244ee823b8SSarah Sharp 625ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(hdev); 6264ee823b8SSarah Sharp if (hub) { 6274ee823b8SSarah Sharp set_bit(portnum, hub->wakeup_bits); 62832a69589SPetr Mladek kick_hub_wq(hub); 6294ee823b8SSarah Sharp } 6304ee823b8SSarah Sharp } 6314ee823b8SSarah Sharp EXPORT_SYMBOL_GPL(usb_wakeup_notification); 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 6347d12e780SDavid Howells static void hub_irq(struct urb *urb) 6351da177e4SLinus Torvalds { 636ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 637e015268dSAlan Stern int status = urb->status; 63871d2718fSRoel Kluin unsigned i; 6391da177e4SLinus Torvalds unsigned long bits; 6401da177e4SLinus Torvalds 641e015268dSAlan Stern switch (status) { 6421da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 6431da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 6441da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 6451da177e4SLinus Torvalds return; 6461da177e4SLinus Torvalds 6471da177e4SLinus Torvalds default: /* presumably an error */ 6481da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 649e015268dSAlan Stern dev_dbg(hub->intfdev, "transfer --> %d\n", status); 6501da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 6511da177e4SLinus Torvalds goto resubmit; 652e015268dSAlan Stern hub->error = status; 6531da177e4SLinus Torvalds /* FALL THROUGH */ 6541da177e4SLinus Torvalds 65537ebb549SPetr Mladek /* let hub_wq handle things */ 6561da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 6571da177e4SLinus Torvalds bits = 0; 6581da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 6591da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 6601da177e4SLinus Torvalds << (i*8); 6611da177e4SLinus Torvalds hub->event_bits[0] = bits; 6621da177e4SLinus Torvalds break; 6631da177e4SLinus Torvalds } 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds hub->nerrors = 0; 6661da177e4SLinus Torvalds 66737ebb549SPetr Mladek /* Something happened, let hub_wq figure it out */ 66832a69589SPetr Mladek kick_hub_wq(hub); 6691da177e4SLinus Torvalds 6701da177e4SLinus Torvalds resubmit: 6711da177e4SLinus Torvalds if (hub->quiescing) 6721da177e4SLinus Torvalds return; 6731da177e4SLinus Torvalds 674088a3daeSKris Borer status = usb_submit_urb(hub->urb, GFP_ATOMIC); 675088a3daeSKris Borer if (status != 0 && status != -ENODEV && status != -EPERM) 6761da177e4SLinus Torvalds dev_err(hub->intfdev, "resubmit --> %d\n", status); 6771da177e4SLinus Torvalds } 6781da177e4SLinus Torvalds 6791da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 6801da177e4SLinus Torvalds static inline int 6811da177e4SLinus Torvalds hub_clear_tt_buffer(struct usb_device *hdev, u16 devinfo, u16 tt) 6821da177e4SLinus Torvalds { 6832c7b871bSWilliam Gulland /* Need to clear both directions for control ep */ 6842c7b871bSWilliam Gulland if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) == 6852c7b871bSWilliam Gulland USB_ENDPOINT_XFER_CONTROL) { 6862c7b871bSWilliam Gulland int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 6872c7b871bSWilliam Gulland HUB_CLEAR_TT_BUFFER, USB_RT_PORT, 6882c7b871bSWilliam Gulland devinfo ^ 0x8000, tt, NULL, 0, 1000); 6892c7b871bSWilliam Gulland if (status) 6902c7b871bSWilliam Gulland return status; 6912c7b871bSWilliam Gulland } 692c2f6595fSAlan Stern return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 6931da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 6941da177e4SLinus Torvalds tt, NULL, 0, 1000); 6951da177e4SLinus Torvalds } 6961da177e4SLinus Torvalds 6971da177e4SLinus Torvalds /* 69837ebb549SPetr Mladek * enumeration blocks hub_wq for a long time. we use keventd instead, since 6991da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 7001da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 7011da177e4SLinus Torvalds * both can talk to the same hub concurrently. 7021da177e4SLinus Torvalds */ 703cb88a1b8SAlan Stern static void hub_tt_work(struct work_struct *work) 7041da177e4SLinus Torvalds { 705c4028958SDavid Howells struct usb_hub *hub = 706cb88a1b8SAlan Stern container_of(work, struct usb_hub, tt.clear_work); 7071da177e4SLinus Torvalds unsigned long flags; 7081da177e4SLinus Torvalds 7091da177e4SLinus Torvalds spin_lock_irqsave(&hub->tt.lock, flags); 7103b6054daSOctavian Purdila while (!list_empty(&hub->tt.clear_list)) { 711d0f830d3SH Hartley Sweeten struct list_head *next; 7121da177e4SLinus Torvalds struct usb_tt_clear *clear; 7131da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 714cb88a1b8SAlan Stern const struct hc_driver *drv; 7151da177e4SLinus Torvalds int status; 7161da177e4SLinus Torvalds 717d0f830d3SH Hartley Sweeten next = hub->tt.clear_list.next; 718d0f830d3SH Hartley Sweeten clear = list_entry(next, struct usb_tt_clear, clear_list); 7191da177e4SLinus Torvalds list_del(&clear->clear_list); 7201da177e4SLinus Torvalds 7211da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 7221da177e4SLinus Torvalds spin_unlock_irqrestore(&hub->tt.lock, flags); 7231da177e4SLinus Torvalds status = hub_clear_tt_buffer(hdev, clear->devinfo, clear->tt); 724e9e88fb7SAlan Stern if (status && status != -ENODEV) 7251da177e4SLinus Torvalds dev_err(&hdev->dev, 7261da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 7271da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 728cb88a1b8SAlan Stern 729cb88a1b8SAlan Stern /* Tell the HCD, even if the operation failed */ 730cb88a1b8SAlan Stern drv = clear->hcd->driver; 731cb88a1b8SAlan Stern if (drv->clear_tt_buffer_complete) 732cb88a1b8SAlan Stern (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); 733cb88a1b8SAlan Stern 7341da177e4SLinus Torvalds kfree(clear); 735cb88a1b8SAlan Stern spin_lock_irqsave(&hub->tt.lock, flags); 7361da177e4SLinus Torvalds } 7371da177e4SLinus Torvalds spin_unlock_irqrestore(&hub->tt.lock, flags); 7381da177e4SLinus Torvalds } 7391da177e4SLinus Torvalds 7401da177e4SLinus Torvalds /** 741971fcd49SLan Tianyu * usb_hub_set_port_power - control hub port's power state 74241341261SMathias Nyman * @hdev: USB device belonging to the usb hub 74341341261SMathias Nyman * @hub: target hub 744971fcd49SLan Tianyu * @port1: port index 745971fcd49SLan Tianyu * @set: expected status 746971fcd49SLan Tianyu * 747971fcd49SLan Tianyu * call this function to control port's power via setting or 748971fcd49SLan Tianyu * clearing the port's PORT_POWER feature. 749626f090cSYacine Belkadi * 750626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 751971fcd49SLan Tianyu */ 75241341261SMathias Nyman int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, 75341341261SMathias Nyman int port1, bool set) 754971fcd49SLan Tianyu { 755971fcd49SLan Tianyu int ret; 756971fcd49SLan Tianyu 757971fcd49SLan Tianyu if (set) 758971fcd49SLan Tianyu ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 759971fcd49SLan Tianyu else 760ad493e5eSLan Tianyu ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 761ad493e5eSLan Tianyu 762d5c3834eSDan Williams if (ret) 763971fcd49SLan Tianyu return ret; 764d5c3834eSDan Williams 765d5c3834eSDan Williams if (set) 766d5c3834eSDan Williams set_bit(port1, hub->power_bits); 767d5c3834eSDan Williams else 768d5c3834eSDan Williams clear_bit(port1, hub->power_bits); 769d5c3834eSDan Williams return 0; 770971fcd49SLan Tianyu } 771971fcd49SLan Tianyu 772971fcd49SLan Tianyu /** 773cb88a1b8SAlan Stern * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub 774cb88a1b8SAlan Stern * @urb: an URB associated with the failed or incomplete split transaction 7751da177e4SLinus Torvalds * 7761da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 7771da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 7781da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 7791da177e4SLinus Torvalds * interrupt context. 7801da177e4SLinus Torvalds * 7811da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 7821da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 783626f090cSYacine Belkadi * 784626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 7851da177e4SLinus Torvalds */ 786cb88a1b8SAlan Stern int usb_hub_clear_tt_buffer(struct urb *urb) 7871da177e4SLinus Torvalds { 788cb88a1b8SAlan Stern struct usb_device *udev = urb->dev; 789cb88a1b8SAlan Stern int pipe = urb->pipe; 7901da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 7911da177e4SLinus Torvalds unsigned long flags; 7921da177e4SLinus Torvalds struct usb_tt_clear *clear; 7931da177e4SLinus Torvalds 7941da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 7951da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 7961da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 7971da177e4SLinus Torvalds */ 798d544d273SGreg Kroah-Hartman clear = kmalloc(sizeof *clear, GFP_ATOMIC); 799d544d273SGreg Kroah-Hartman if (clear == NULL) { 8001da177e4SLinus Torvalds dev_err(&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 8011da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 802cb88a1b8SAlan Stern return -ENOMEM; 8031da177e4SLinus Torvalds } 8041da177e4SLinus Torvalds 8051da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 8061da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 8071da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 8081da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 8091da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol(pipe) 8101da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 8111da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 8121da177e4SLinus Torvalds if (usb_pipein(pipe)) 8131da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 8141da177e4SLinus Torvalds 815cb88a1b8SAlan Stern /* info for completion callback */ 816cb88a1b8SAlan Stern clear->hcd = bus_to_hcd(udev->bus); 817cb88a1b8SAlan Stern clear->ep = urb->ep; 818cb88a1b8SAlan Stern 8191da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 8201da177e4SLinus Torvalds spin_lock_irqsave(&tt->lock, flags); 8211da177e4SLinus Torvalds list_add_tail(&clear->clear_list, &tt->clear_list); 822cb88a1b8SAlan Stern schedule_work(&tt->clear_work); 8231da177e4SLinus Torvalds spin_unlock_irqrestore(&tt->lock, flags); 824cb88a1b8SAlan Stern return 0; 8251da177e4SLinus Torvalds } 826cb88a1b8SAlan Stern EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); 8271da177e4SLinus Torvalds 8287ad3c470SDan Williams static void hub_power_on(struct usb_hub *hub, bool do_delay) 8291da177e4SLinus Torvalds { 8301da177e4SLinus Torvalds int port1; 8311da177e4SLinus Torvalds 8324489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 8334489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 8344489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 8354489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 8364489a571SAlan Stern * unless we send these messages to the hub. 8374489a571SAlan Stern */ 8389262c19dSDan Williams if (hub_is_port_power_switchable(hub)) 8391da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 8404489a571SAlan Stern else 8414489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 8424489a571SAlan Stern "non-switchable hub\n"); 8433bbc47d8SKrzysztof Mazur for (port1 = 1; port1 <= hub->hdev->maxchild; port1++) 844d5c3834eSDan Williams if (test_bit(port1, hub->power_bits)) 8454489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 846ad493e5eSLan Tianyu else 847ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 848ad493e5eSLan Tianyu USB_PORT_FEAT_POWER); 8498520f380SAlan Stern if (do_delay) 8507ad3c470SDan Williams msleep(hub_power_on_good_delay(hub)); 8511da177e4SLinus Torvalds } 8521da177e4SLinus Torvalds 8531da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 8541da177e4SLinus Torvalds u16 *status, u16 *change) 8551da177e4SLinus Torvalds { 8561da177e4SLinus Torvalds int ret; 8571da177e4SLinus Torvalds 858db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 8591da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 860e9e88fb7SAlan Stern if (ret < 0) { 861e9e88fb7SAlan Stern if (ret != -ENODEV) 8621da177e4SLinus Torvalds dev_err(hub->intfdev, 863441b62c1SHarvey Harrison "%s failed (err = %d)\n", __func__, ret); 864e9e88fb7SAlan Stern } else { 8651da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 8661da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 8671da177e4SLinus Torvalds ret = 0; 8681da177e4SLinus Torvalds } 869db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 8701da177e4SLinus Torvalds return ret; 8711da177e4SLinus Torvalds } 8721da177e4SLinus Torvalds 87341e7e056SSarah Sharp static int hub_set_port_link_state(struct usb_hub *hub, int port1, 87441e7e056SSarah Sharp unsigned int link_status) 87541e7e056SSarah Sharp { 87641e7e056SSarah Sharp return set_port_feature(hub->hdev, 87741e7e056SSarah Sharp port1 | (link_status << 3), 87841e7e056SSarah Sharp USB_PORT_FEAT_LINK_STATE); 87941e7e056SSarah Sharp } 88041e7e056SSarah Sharp 88141e7e056SSarah Sharp /* 88241e7e056SSarah Sharp * If USB 3.0 ports are placed into the Disabled state, they will no longer 88341e7e056SSarah Sharp * detect any device connects or disconnects. This is generally not what the 88441e7e056SSarah Sharp * USB core wants, since it expects a disabled port to produce a port status 88541e7e056SSarah Sharp * change event when a new device connects. 88641e7e056SSarah Sharp * 88741e7e056SSarah Sharp * Instead, set the link state to Disabled, wait for the link to settle into 88841e7e056SSarah Sharp * that state, clear any change bits, and then put the port into the RxDetect 88941e7e056SSarah Sharp * state. 89041e7e056SSarah Sharp */ 89141e7e056SSarah Sharp static int hub_usb3_port_disable(struct usb_hub *hub, int port1) 89241e7e056SSarah Sharp { 89341e7e056SSarah Sharp int ret; 89441e7e056SSarah Sharp int total_time; 89541e7e056SSarah Sharp u16 portchange, portstatus; 89641e7e056SSarah Sharp 89741e7e056SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 89841e7e056SSarah Sharp return -EINVAL; 89941e7e056SSarah Sharp 900bb86cf56SGavin Guo ret = hub_port_status(hub, port1, &portstatus, &portchange); 901bb86cf56SGavin Guo if (ret < 0) 902bb86cf56SGavin Guo return ret; 903bb86cf56SGavin Guo 904bb86cf56SGavin Guo /* 905bb86cf56SGavin Guo * USB controller Advanced Micro Devices, Inc. [AMD] FCH USB XHCI 906bb86cf56SGavin Guo * Controller [1022:7814] will have spurious result making the following 907bb86cf56SGavin Guo * usb 3.0 device hotplugging route to the 2.0 root hub and recognized 908bb86cf56SGavin Guo * as high-speed device if we set the usb 3.0 port link state to 909bb86cf56SGavin Guo * Disabled. Since it's already in USB_SS_PORT_LS_RX_DETECT state, we 910bb86cf56SGavin Guo * check the state here to avoid the bug. 911bb86cf56SGavin Guo */ 912bb86cf56SGavin Guo if ((portstatus & USB_PORT_STAT_LINK_STATE) == 913bb86cf56SGavin Guo USB_SS_PORT_LS_RX_DETECT) { 914bb86cf56SGavin Guo dev_dbg(&hub->ports[port1 - 1]->dev, 915bb86cf56SGavin Guo "Not disabling port; link state is RxDetect\n"); 916bb86cf56SGavin Guo return ret; 917bb86cf56SGavin Guo } 918bb86cf56SGavin Guo 91941e7e056SSarah Sharp ret = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_SS_DISABLED); 920e9e88fb7SAlan Stern if (ret) 92141e7e056SSarah Sharp return ret; 92241e7e056SSarah Sharp 92341e7e056SSarah Sharp /* Wait for the link to enter the disabled state. */ 92441e7e056SSarah Sharp for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 92541e7e056SSarah Sharp ret = hub_port_status(hub, port1, &portstatus, &portchange); 92641e7e056SSarah Sharp if (ret < 0) 92741e7e056SSarah Sharp return ret; 92841e7e056SSarah Sharp 92941e7e056SSarah Sharp if ((portstatus & USB_PORT_STAT_LINK_STATE) == 93041e7e056SSarah Sharp USB_SS_PORT_LS_SS_DISABLED) 93141e7e056SSarah Sharp break; 93241e7e056SSarah Sharp if (total_time >= HUB_DEBOUNCE_TIMEOUT) 93341e7e056SSarah Sharp break; 93441e7e056SSarah Sharp msleep(HUB_DEBOUNCE_STEP); 93541e7e056SSarah Sharp } 93641e7e056SSarah Sharp if (total_time >= HUB_DEBOUNCE_TIMEOUT) 937d99f6b41SDan Williams dev_warn(&hub->ports[port1 - 1]->dev, 938d99f6b41SDan Williams "Could not disable after %d ms\n", total_time); 93941e7e056SSarah Sharp 94041e7e056SSarah Sharp return hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_RX_DETECT); 94141e7e056SSarah Sharp } 94241e7e056SSarah Sharp 9438b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 9448b28c752SAlan Stern { 945d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 9468b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 9470458d5b4SAlan Stern int ret = 0; 9488b28c752SAlan Stern 949d99f6b41SDan Williams if (port_dev->child && set_state) 950d99f6b41SDan Williams usb_set_device_state(port_dev->child, USB_STATE_NOTATTACHED); 95141e7e056SSarah Sharp if (!hub->error) { 95241e7e056SSarah Sharp if (hub_is_superspeed(hub->hdev)) 95341e7e056SSarah Sharp ret = hub_usb3_port_disable(hub, port1); 95441e7e056SSarah Sharp else 955ad493e5eSLan Tianyu ret = usb_clear_port_feature(hdev, port1, 95641e7e056SSarah Sharp USB_PORT_FEAT_ENABLE); 95741e7e056SSarah Sharp } 958e9e88fb7SAlan Stern if (ret && ret != -ENODEV) 959d99f6b41SDan Williams dev_err(&port_dev->dev, "cannot disable (err = %d)\n", ret); 9608b28c752SAlan Stern return ret; 9618b28c752SAlan Stern } 9628b28c752SAlan Stern 9630458d5b4SAlan Stern /* 9646d42fcdbSJustin P. Mattock * Disable a port and mark a logical connect-change event, so that some 96537ebb549SPetr Mladek * time later hub_wq will disconnect() any existing usb_device on the port 9660458d5b4SAlan Stern * and will re-enumerate if there actually is a device attached. 9670458d5b4SAlan Stern */ 9680458d5b4SAlan Stern static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 9697d069b7dSAlan Stern { 970d99f6b41SDan Williams dev_dbg(&hub->ports[port1 - 1]->dev, "logical disconnect\n"); 9710458d5b4SAlan Stern hub_port_disable(hub, port1, 1); 9720458d5b4SAlan Stern 9730458d5b4SAlan Stern /* FIXME let caller ask to power down the port: 9740458d5b4SAlan Stern * - some devices won't enumerate without a VBUS power cycle 9750458d5b4SAlan Stern * - SRP saves power that way 9760458d5b4SAlan Stern * - ... new call, TBD ... 9770458d5b4SAlan Stern * That's easy if this hub can switch power per-port, and 97837ebb549SPetr Mladek * hub_wq reactivates the port later (timer, SRP, etc). 9790458d5b4SAlan Stern * Powerdown must be optional, because of reset/DFU. 9800458d5b4SAlan Stern */ 9810458d5b4SAlan Stern 9820458d5b4SAlan Stern set_bit(port1, hub->change_bits); 98332a69589SPetr Mladek kick_hub_wq(hub); 9840458d5b4SAlan Stern } 9850458d5b4SAlan Stern 986253e0572SAlan Stern /** 987253e0572SAlan Stern * usb_remove_device - disable a device's port on its parent hub 988253e0572SAlan Stern * @udev: device to be disabled and removed 989253e0572SAlan Stern * Context: @udev locked, must be able to sleep. 990253e0572SAlan Stern * 99137ebb549SPetr Mladek * After @udev's port has been disabled, hub_wq is notified and it will 992253e0572SAlan Stern * see that the device has been disconnected. When the device is 993253e0572SAlan Stern * physically unplugged and something is plugged in, the events will 994253e0572SAlan Stern * be received and processed normally. 995626f090cSYacine Belkadi * 996626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 997253e0572SAlan Stern */ 998253e0572SAlan Stern int usb_remove_device(struct usb_device *udev) 999253e0572SAlan Stern { 1000253e0572SAlan Stern struct usb_hub *hub; 1001253e0572SAlan Stern struct usb_interface *intf; 1002253e0572SAlan Stern 1003253e0572SAlan Stern if (!udev->parent) /* Can't remove a root hub */ 1004253e0572SAlan Stern return -EINVAL; 1005ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 1006253e0572SAlan Stern intf = to_usb_interface(hub->intfdev); 1007253e0572SAlan Stern 1008253e0572SAlan Stern usb_autopm_get_interface(intf); 1009253e0572SAlan Stern set_bit(udev->portnum, hub->removed_bits); 1010253e0572SAlan Stern hub_port_logical_disconnect(hub, udev->portnum); 1011253e0572SAlan Stern usb_autopm_put_interface(intf); 1012253e0572SAlan Stern return 0; 1013253e0572SAlan Stern } 1014253e0572SAlan Stern 10156ee0b270SAlan Stern enum hub_activation_type { 10168e4ceb38SAlan Stern HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ 10178520f380SAlan Stern HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, 10186ee0b270SAlan Stern }; 10195e6effaeSAlan Stern 10208520f380SAlan Stern static void hub_init_func2(struct work_struct *ws); 10218520f380SAlan Stern static void hub_init_func3(struct work_struct *ws); 10228520f380SAlan Stern 1023f2835219SAlan Stern static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) 10245e6effaeSAlan Stern { 10255e6effaeSAlan Stern struct usb_device *hdev = hub->hdev; 1026653a39d1SSarah Sharp struct usb_hcd *hcd; 1027653a39d1SSarah Sharp int ret; 10285e6effaeSAlan Stern int port1; 1029f2835219SAlan Stern int status; 1030948fea37SAlan Stern bool need_debounce_delay = false; 10318520f380SAlan Stern unsigned delay; 10328520f380SAlan Stern 10338520f380SAlan Stern /* Continue a partial initialization */ 10348520f380SAlan Stern if (type == HUB_INIT2) 10358520f380SAlan Stern goto init2; 10368520f380SAlan Stern if (type == HUB_INIT3) 10378520f380SAlan Stern goto init3; 10385e6effaeSAlan Stern 1039a45aa3b3SElric Fu /* The superspeed hub except for root hub has to use Hub Depth 1040a45aa3b3SElric Fu * value as an offset into the route string to locate the bits 1041a45aa3b3SElric Fu * it uses to determine the downstream port number. So hub driver 1042a45aa3b3SElric Fu * should send a set hub depth request to superspeed hub after 1043a45aa3b3SElric Fu * the superspeed hub is set configuration in initialization or 1044a45aa3b3SElric Fu * reset procedure. 1045a45aa3b3SElric Fu * 1046a45aa3b3SElric Fu * After a resume, port power should still be on. 1047f2835219SAlan Stern * For any other type of activation, turn it on. 1048f2835219SAlan Stern */ 10498520f380SAlan Stern if (type != HUB_RESUME) { 1050a45aa3b3SElric Fu if (hdev->parent && hub_is_superspeed(hdev)) { 1051a45aa3b3SElric Fu ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1052a45aa3b3SElric Fu HUB_SET_DEPTH, USB_RT_HUB, 1053a45aa3b3SElric Fu hdev->level - 1, 0, NULL, 0, 1054a45aa3b3SElric Fu USB_CTRL_SET_TIMEOUT); 1055a45aa3b3SElric Fu if (ret < 0) 1056a45aa3b3SElric Fu dev_err(hub->intfdev, 1057a45aa3b3SElric Fu "set hub depth failed\n"); 1058a45aa3b3SElric Fu } 10598520f380SAlan Stern 10608520f380SAlan Stern /* Speed up system boot by using a delayed_work for the 10618520f380SAlan Stern * hub's initial power-up delays. This is pretty awkward 10628520f380SAlan Stern * and the implementation looks like a home-brewed sort of 10638520f380SAlan Stern * setjmp/longjmp, but it saves at least 100 ms for each 10648520f380SAlan Stern * root hub (assuming usbcore is compiled into the kernel 10658520f380SAlan Stern * rather than as a module). It adds up. 10668520f380SAlan Stern * 10678520f380SAlan Stern * This can't be done for HUB_RESUME or HUB_RESET_RESUME 10688520f380SAlan Stern * because for those activation types the ports have to be 10698520f380SAlan Stern * operational when we return. In theory this could be done 10708520f380SAlan Stern * for HUB_POST_RESET, but it's easier not to. 10718520f380SAlan Stern */ 10728520f380SAlan Stern if (type == HUB_INIT) { 107317a364e2SKris Borer delay = hub_power_on_good_delay(hub); 10747ad3c470SDan Williams 10757ad3c470SDan Williams hub_power_on(hub, false); 107677fa83cfSTejun Heo INIT_DELAYED_WORK(&hub->init_work, hub_init_func2); 107722f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 107822f6a0f0SShaibal Dutta &hub->init_work, 10798520f380SAlan Stern msecs_to_jiffies(delay)); 108061fbeba1SAlan Stern 108161fbeba1SAlan Stern /* Suppress autosuspend until init is done */ 10828e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 10838e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 10848520f380SAlan Stern return; /* Continues at init2: below */ 1085653a39d1SSarah Sharp } else if (type == HUB_RESET_RESUME) { 1086653a39d1SSarah Sharp /* The internal host controller state for the hub device 1087653a39d1SSarah Sharp * may be gone after a host power loss on system resume. 1088653a39d1SSarah Sharp * Update the device's info so the HW knows it's a hub. 1089653a39d1SSarah Sharp */ 1090653a39d1SSarah Sharp hcd = bus_to_hcd(hdev->bus); 1091653a39d1SSarah Sharp if (hcd->driver->update_hub_device) { 1092653a39d1SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1093653a39d1SSarah Sharp &hub->tt, GFP_NOIO); 1094653a39d1SSarah Sharp if (ret < 0) { 1095653a39d1SSarah Sharp dev_err(hub->intfdev, "Host not " 1096653a39d1SSarah Sharp "accepting hub info " 1097653a39d1SSarah Sharp "update.\n"); 1098653a39d1SSarah Sharp dev_err(hub->intfdev, "LS/FS devices " 1099653a39d1SSarah Sharp "and hubs may not work " 1100653a39d1SSarah Sharp "under this hub\n."); 1101653a39d1SSarah Sharp } 1102653a39d1SSarah Sharp } 1103653a39d1SSarah Sharp hub_power_on(hub, true); 11048520f380SAlan Stern } else { 11058520f380SAlan Stern hub_power_on(hub, true); 11068520f380SAlan Stern } 11078520f380SAlan Stern } 11088520f380SAlan Stern init2: 1109f2835219SAlan Stern 1110d99f6b41SDan Williams /* 111137ebb549SPetr Mladek * Check each port and set hub->change_bits to let hub_wq know 11126ee0b270SAlan Stern * which ports need attention. 11135e6effaeSAlan Stern */ 11145e6effaeSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 1115d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 1116d99f6b41SDan Williams struct usb_device *udev = port_dev->child; 11175e6effaeSAlan Stern u16 portstatus, portchange; 11185e6effaeSAlan Stern 11196ee0b270SAlan Stern portstatus = portchange = 0; 11206ee0b270SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 11216ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 1122d99f6b41SDan Williams dev_dbg(&port_dev->dev, "status %04x change %04x\n", 1123d99f6b41SDan Williams portstatus, portchange); 11245e6effaeSAlan Stern 1125d99f6b41SDan Williams /* 1126d99f6b41SDan Williams * After anything other than HUB_RESUME (i.e., initialization 11276ee0b270SAlan Stern * or any sort of reset), every port should be disabled. 11286ee0b270SAlan Stern * Unconnected ports should likewise be disabled (paranoia), 11296ee0b270SAlan Stern * and so should ports for which we have no usb_device. 11305e6effaeSAlan Stern */ 11316ee0b270SAlan Stern if ((portstatus & USB_PORT_STAT_ENABLE) && ( 11326ee0b270SAlan Stern type != HUB_RESUME || 11336ee0b270SAlan Stern !(portstatus & USB_PORT_STAT_CONNECTION) || 11346ee0b270SAlan Stern !udev || 11356ee0b270SAlan Stern udev->state == USB_STATE_NOTATTACHED)) { 11369f0a6cd3SAndiry Xu /* 11379f0a6cd3SAndiry Xu * USB3 protocol ports will automatically transition 11389f0a6cd3SAndiry Xu * to Enabled state when detect an USB3.0 device attach. 1139fd1ac4cfSDan Williams * Do not disable USB3 protocol ports, just pretend 1140fd1ac4cfSDan Williams * power was lost 11419f0a6cd3SAndiry Xu */ 1142fd1ac4cfSDan Williams portstatus &= ~USB_PORT_STAT_ENABLE; 1143fd1ac4cfSDan Williams if (!hub_is_superspeed(hdev)) 1144ad493e5eSLan Tianyu usb_clear_port_feature(hdev, port1, 11459f0a6cd3SAndiry Xu USB_PORT_FEAT_ENABLE); 11469f0a6cd3SAndiry Xu } 11476ee0b270SAlan Stern 1148948fea37SAlan Stern /* Clear status-change flags; we'll debounce later */ 1149948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) { 1150948fea37SAlan Stern need_debounce_delay = true; 1151ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1152948fea37SAlan Stern USB_PORT_FEAT_C_CONNECTION); 1153948fea37SAlan Stern } 1154948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) { 1155948fea37SAlan Stern need_debounce_delay = true; 1156ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1157948fea37SAlan Stern USB_PORT_FEAT_C_ENABLE); 1158948fea37SAlan Stern } 1159e92aee33SJulius Werner if (portchange & USB_PORT_STAT_C_RESET) { 1160e92aee33SJulius Werner need_debounce_delay = true; 1161e92aee33SJulius Werner usb_clear_port_feature(hub->hdev, port1, 1162e92aee33SJulius Werner USB_PORT_FEAT_C_RESET); 1163e92aee33SJulius Werner } 116479c3dd81SDon Zickus if ((portchange & USB_PORT_STAT_C_BH_RESET) && 116579c3dd81SDon Zickus hub_is_superspeed(hub->hdev)) { 116679c3dd81SDon Zickus need_debounce_delay = true; 1167ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 116879c3dd81SDon Zickus USB_PORT_FEAT_C_BH_PORT_RESET); 116979c3dd81SDon Zickus } 1170253e0572SAlan Stern /* We can forget about a "removed" device when there's a 1171253e0572SAlan Stern * physical disconnect or the connect status changes. 1172253e0572SAlan Stern */ 1173253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 1174253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 1175253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 1176253e0572SAlan Stern 11776ee0b270SAlan Stern if (!udev || udev->state == USB_STATE_NOTATTACHED) { 117837ebb549SPetr Mladek /* Tell hub_wq to disconnect the device or 11796ee0b270SAlan Stern * check for a new connection 11806ee0b270SAlan Stern */ 118108d1dec6SShen Guang if (udev || (portstatus & USB_PORT_STAT_CONNECTION) || 118208d1dec6SShen Guang (portstatus & USB_PORT_STAT_OVERCURRENT)) 11836ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11846ee0b270SAlan Stern 11856ee0b270SAlan Stern } else if (portstatus & USB_PORT_STAT_ENABLE) { 118672937e1eSSarah Sharp bool port_resumed = (portstatus & 118772937e1eSSarah Sharp USB_PORT_STAT_LINK_STATE) == 118872937e1eSSarah Sharp USB_SS_PORT_LS_U0; 11896ee0b270SAlan Stern /* The power session apparently survived the resume. 11906ee0b270SAlan Stern * If there was an overcurrent or suspend change 119137ebb549SPetr Mladek * (i.e., remote wakeup request), have hub_wq 119272937e1eSSarah Sharp * take care of it. Look at the port link state 119372937e1eSSarah Sharp * for USB 3.0 hubs, since they don't have a suspend 119472937e1eSSarah Sharp * change bit, and they don't set the port link change 119572937e1eSSarah Sharp * bit on device-initiated resume. 11966ee0b270SAlan Stern */ 119772937e1eSSarah Sharp if (portchange || (hub_is_superspeed(hub->hdev) && 119872937e1eSSarah Sharp port_resumed)) 11996ee0b270SAlan Stern set_bit(port1, hub->change_bits); 12006ee0b270SAlan Stern 12016ee0b270SAlan Stern } else if (udev->persist_enabled) { 12026ee0b270SAlan Stern #ifdef CONFIG_PM 12035e6effaeSAlan Stern udev->reset_resume = 1; 12046ee0b270SAlan Stern #endif 1205ad493e5eSLan Tianyu /* Don't set the change_bits when the device 1206ad493e5eSLan Tianyu * was powered off. 1207ad493e5eSLan Tianyu */ 1208d5c3834eSDan Williams if (test_bit(port1, hub->power_bits)) 12098808f00cSAlan Stern set_bit(port1, hub->change_bits); 12108808f00cSAlan Stern 12116ee0b270SAlan Stern } else { 121237ebb549SPetr Mladek /* The power session is gone; tell hub_wq */ 12136ee0b270SAlan Stern usb_set_device_state(udev, USB_STATE_NOTATTACHED); 12146ee0b270SAlan Stern set_bit(port1, hub->change_bits); 12155e6effaeSAlan Stern } 12165e6effaeSAlan Stern } 12175e6effaeSAlan Stern 1218948fea37SAlan Stern /* If no port-status-change flags were set, we don't need any 1219948fea37SAlan Stern * debouncing. If flags were set we can try to debounce the 122037ebb549SPetr Mladek * ports all at once right now, instead of letting hub_wq do them 1221948fea37SAlan Stern * one at a time later on. 1222948fea37SAlan Stern * 122337ebb549SPetr Mladek * If any port-status changes do occur during this delay, hub_wq 1224948fea37SAlan Stern * will see them later and handle them normally. 1225948fea37SAlan Stern */ 12268520f380SAlan Stern if (need_debounce_delay) { 12278520f380SAlan Stern delay = HUB_DEBOUNCE_STABLE; 1228f2835219SAlan Stern 12298520f380SAlan Stern /* Don't do a long sleep inside a workqueue routine */ 12308520f380SAlan Stern if (type == HUB_INIT2) { 123177fa83cfSTejun Heo INIT_DELAYED_WORK(&hub->init_work, hub_init_func3); 123222f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 123322f6a0f0SShaibal Dutta &hub->init_work, 12348520f380SAlan Stern msecs_to_jiffies(delay)); 12358520f380SAlan Stern return; /* Continues at init3: below */ 12368520f380SAlan Stern } else { 12378520f380SAlan Stern msleep(delay); 12388520f380SAlan Stern } 12398520f380SAlan Stern } 12408520f380SAlan Stern init3: 1241f2835219SAlan Stern hub->quiescing = 0; 1242f2835219SAlan Stern 1243f2835219SAlan Stern status = usb_submit_urb(hub->urb, GFP_NOIO); 1244f2835219SAlan Stern if (status < 0) 1245f2835219SAlan Stern dev_err(hub->intfdev, "activate --> %d\n", status); 1246f2835219SAlan Stern if (hub->has_indicators && blinkenlights) 124722f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 124822f6a0f0SShaibal Dutta &hub->leds, LED_CYCLE_PERIOD); 1249f2835219SAlan Stern 1250f2835219SAlan Stern /* Scan all ports that need attention */ 125132a69589SPetr Mladek kick_hub_wq(hub); 12528e4ceb38SAlan Stern 12538e4ceb38SAlan Stern /* Allow autosuspend if it was suppressed */ 12548e4ceb38SAlan Stern if (type <= HUB_INIT3) 12558e4ceb38SAlan Stern usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); 12565e6effaeSAlan Stern } 12575e6effaeSAlan Stern 12588520f380SAlan Stern /* Implement the continuations for the delays above */ 12598520f380SAlan Stern static void hub_init_func2(struct work_struct *ws) 12608520f380SAlan Stern { 12618520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 12628520f380SAlan Stern 12638520f380SAlan Stern hub_activate(hub, HUB_INIT2); 12648520f380SAlan Stern } 12658520f380SAlan Stern 12668520f380SAlan Stern static void hub_init_func3(struct work_struct *ws) 12678520f380SAlan Stern { 12688520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 12698520f380SAlan Stern 12708520f380SAlan Stern hub_activate(hub, HUB_INIT3); 12718520f380SAlan Stern } 12728520f380SAlan Stern 12734330354fSAlan Stern enum hub_quiescing_type { 12744330354fSAlan Stern HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND 12754330354fSAlan Stern }; 12764330354fSAlan Stern 12774330354fSAlan Stern static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) 12784330354fSAlan Stern { 12794330354fSAlan Stern struct usb_device *hdev = hub->hdev; 12804330354fSAlan Stern int i; 12814330354fSAlan Stern 12828520f380SAlan Stern cancel_delayed_work_sync(&hub->init_work); 12838520f380SAlan Stern 128437ebb549SPetr Mladek /* hub_wq and related activity won't re-trigger */ 12854330354fSAlan Stern hub->quiescing = 1; 12864330354fSAlan Stern 12874330354fSAlan Stern if (type != HUB_SUSPEND) { 12884330354fSAlan Stern /* Disconnect all the children */ 12894330354fSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 1290ff823c79SLan Tianyu if (hub->ports[i]->child) 1291ff823c79SLan Tianyu usb_disconnect(&hub->ports[i]->child); 12924330354fSAlan Stern } 12934330354fSAlan Stern } 12944330354fSAlan Stern 129537ebb549SPetr Mladek /* Stop hub_wq and related activity */ 12964330354fSAlan Stern usb_kill_urb(hub->urb); 12974330354fSAlan Stern if (hub->has_indicators) 12984330354fSAlan Stern cancel_delayed_work_sync(&hub->leds); 12994330354fSAlan Stern if (hub->tt.hub) 1300036546bfSOctavian Purdila flush_work(&hub->tt.clear_work); 13014330354fSAlan Stern } 13024330354fSAlan Stern 1303600856c2SAlan Stern static void hub_pm_barrier_for_all_ports(struct usb_hub *hub) 1304600856c2SAlan Stern { 1305600856c2SAlan Stern int i; 1306600856c2SAlan Stern 1307600856c2SAlan Stern for (i = 0; i < hub->hdev->maxchild; ++i) 1308600856c2SAlan Stern pm_runtime_barrier(&hub->ports[i]->dev); 1309600856c2SAlan Stern } 1310600856c2SAlan Stern 13113eb14915SAlan Stern /* caller has locked the hub device */ 13123eb14915SAlan Stern static int hub_pre_reset(struct usb_interface *intf) 13133eb14915SAlan Stern { 13143eb14915SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 13153eb14915SAlan Stern 13164330354fSAlan Stern hub_quiesce(hub, HUB_PRE_RESET); 1317600856c2SAlan Stern hub->in_reset = 1; 1318600856c2SAlan Stern hub_pm_barrier_for_all_ports(hub); 1319f07600cfSAlan Stern return 0; 13207d069b7dSAlan Stern } 13217d069b7dSAlan Stern 13227d069b7dSAlan Stern /* caller has locked the hub device */ 1323f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 13247d069b7dSAlan Stern { 13257de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 13267de18d8bSAlan Stern 1327600856c2SAlan Stern hub->in_reset = 0; 1328600856c2SAlan Stern hub_pm_barrier_for_all_ports(hub); 1329f2835219SAlan Stern hub_activate(hub, HUB_POST_RESET); 1330f07600cfSAlan Stern return 0; 13317d069b7dSAlan Stern } 13327d069b7dSAlan Stern 13331da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 13341da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 13351da177e4SLinus Torvalds { 1336b356b7c7SSarah Sharp struct usb_hcd *hcd; 13371da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 13381da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 13391da177e4SLinus Torvalds u16 hubstatus, hubchange; 134074ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 13411da177e4SLinus Torvalds unsigned int pipe; 1342fa2a9566SLan Tianyu int maxp, ret, i; 13437cbe5dcaSAlan Stern char *message = "out of memory"; 1344430ee58eSSebastian Andrzej Siewior unsigned unit_load; 1345430ee58eSSebastian Andrzej Siewior unsigned full_load; 1346d8521afeSDan Williams unsigned maxchild; 13471da177e4SLinus Torvalds 1348d697cddaSAlan Stern hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); 13491da177e4SLinus Torvalds if (!hub->buffer) { 13501da177e4SLinus Torvalds ret = -ENOMEM; 13511da177e4SLinus Torvalds goto fail; 13521da177e4SLinus Torvalds } 13531da177e4SLinus Torvalds 13541da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 13551da177e4SLinus Torvalds if (!hub->status) { 13561da177e4SLinus Torvalds ret = -ENOMEM; 13571da177e4SLinus Torvalds goto fail; 13581da177e4SLinus Torvalds } 1359db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 13601da177e4SLinus Torvalds 13611da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 13621da177e4SLinus Torvalds if (!hub->descriptor) { 13631da177e4SLinus Torvalds ret = -ENOMEM; 13641da177e4SLinus Torvalds goto fail; 13651da177e4SLinus Torvalds } 13661da177e4SLinus Torvalds 13671da177e4SLinus Torvalds /* Request the entire hub descriptor. 13681da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 13691da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 13701da177e4SLinus Torvalds */ 1371dbe79bbeSJohn Youn ret = get_hub_descriptor(hdev, hub->descriptor); 13721da177e4SLinus Torvalds if (ret < 0) { 13731da177e4SLinus Torvalds message = "can't read hub descriptor"; 13741da177e4SLinus Torvalds goto fail; 13751da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 13761da177e4SLinus Torvalds message = "hub has too many ports!"; 13771da177e4SLinus Torvalds ret = -ENODEV; 13781da177e4SLinus Torvalds goto fail; 1379769d7368SDavid Linares } else if (hub->descriptor->bNbrPorts == 0) { 1380769d7368SDavid Linares message = "hub doesn't have any ports!"; 1381769d7368SDavid Linares ret = -ENODEV; 1382769d7368SDavid Linares goto fail; 13831da177e4SLinus Torvalds } 13841da177e4SLinus Torvalds 1385d8521afeSDan Williams maxchild = hub->descriptor->bNbrPorts; 1386d8521afeSDan Williams dev_info(hub_dev, "%d port%s detected\n", maxchild, 1387d8521afeSDan Williams (maxchild == 1) ? "" : "s"); 13881da177e4SLinus Torvalds 1389d8521afeSDan Williams hub->ports = kzalloc(maxchild * sizeof(struct usb_port *), GFP_KERNEL); 1390ff823c79SLan Tianyu if (!hub->ports) { 13917cbe5dcaSAlan Stern ret = -ENOMEM; 13927cbe5dcaSAlan Stern goto fail; 13937cbe5dcaSAlan Stern } 13947cbe5dcaSAlan Stern 139574ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 1396430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hdev)) { 1397430ee58eSSebastian Andrzej Siewior unit_load = 150; 1398430ee58eSSebastian Andrzej Siewior full_load = 900; 1399430ee58eSSebastian Andrzej Siewior } else { 1400430ee58eSSebastian Andrzej Siewior unit_load = 100; 1401430ee58eSSebastian Andrzej Siewior full_load = 500; 1402430ee58eSSebastian Andrzej Siewior } 14031da177e4SLinus Torvalds 1404dbe79bbeSJohn Youn /* FIXME for USB 3.0, skip for now */ 1405dbe79bbeSJohn Youn if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && 1406dbe79bbeSJohn Youn !(hub_is_superspeed(hdev))) { 14071da177e4SLinus Torvalds char portstr[USB_MAXCHILDREN + 1]; 14081da177e4SLinus Torvalds 1409d8521afeSDan Williams for (i = 0; i < maxchild; i++) 1410dbe79bbeSJohn Youn portstr[i] = hub->descriptor->u.hs.DeviceRemovable 14111da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 14121da177e4SLinus Torvalds ? 'F' : 'R'; 1413d8521afeSDan Williams portstr[maxchild] = 0; 14141da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 14151da177e4SLinus Torvalds } else 14161da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 14171da177e4SLinus Torvalds 141874ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 14197bf01185SAman Deep case HUB_CHAR_COMMON_LPSM: 14201da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 14211da177e4SLinus Torvalds break; 14227bf01185SAman Deep case HUB_CHAR_INDV_PORT_LPSM: 14231da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 14241da177e4SLinus Torvalds break; 14257bf01185SAman Deep case HUB_CHAR_NO_LPSM: 14267bf01185SAman Deep case HUB_CHAR_LPSM: 14271da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 14281da177e4SLinus Torvalds break; 14291da177e4SLinus Torvalds } 14301da177e4SLinus Torvalds 143174ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 14327bf01185SAman Deep case HUB_CHAR_COMMON_OCPM: 14331da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 14341da177e4SLinus Torvalds break; 14357bf01185SAman Deep case HUB_CHAR_INDV_PORT_OCPM: 14361da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 14371da177e4SLinus Torvalds break; 14387bf01185SAman Deep case HUB_CHAR_NO_OCPM: 14397bf01185SAman Deep case HUB_CHAR_OCPM: 14401da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 14411da177e4SLinus Torvalds break; 14421da177e4SLinus Torvalds } 14431da177e4SLinus Torvalds 14441da177e4SLinus Torvalds spin_lock_init(&hub->tt.lock); 14451da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->tt.clear_list); 1446cb88a1b8SAlan Stern INIT_WORK(&hub->tt.clear_work, hub_tt_work); 14471da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 14487bf01185SAman Deep case USB_HUB_PR_FS: 14491da177e4SLinus Torvalds break; 14507bf01185SAman Deep case USB_HUB_PR_HS_SINGLE_TT: 14511da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 14521da177e4SLinus Torvalds hub->tt.hub = hdev; 14531da177e4SLinus Torvalds break; 14547bf01185SAman Deep case USB_HUB_PR_HS_MULTI_TT: 14551da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 14561da177e4SLinus Torvalds if (ret == 0) { 14571da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 14581da177e4SLinus Torvalds hub->tt.multi = 1; 14591da177e4SLinus Torvalds } else 14601da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 14611da177e4SLinus Torvalds ret); 14621da177e4SLinus Torvalds hub->tt.hub = hdev; 14631da177e4SLinus Torvalds break; 14647bf01185SAman Deep case USB_HUB_PR_SS: 1465d2e9b4d6SSarah Sharp /* USB 3.0 hubs don't have a TT */ 1466d2e9b4d6SSarah Sharp break; 14671da177e4SLinus Torvalds default: 14681da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 14691da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 14701da177e4SLinus Torvalds break; 14711da177e4SLinus Torvalds } 14721da177e4SLinus Torvalds 1473e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 147474ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 1475e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 1476e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 1477e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 1478e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1479e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1480e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 1481e09711aeSdavid-b@pacbell.net } 14821da177e4SLinus Torvalds break; 1483e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 1484e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 1485e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1486e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1487e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 14881da177e4SLinus Torvalds break; 1489e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 1490e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 1491e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1492e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1493e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 14941da177e4SLinus Torvalds break; 1495e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 1496e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 1497e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1498e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1499e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 15001da177e4SLinus Torvalds break; 15011da177e4SLinus Torvalds } 15021da177e4SLinus Torvalds 15031da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 150474ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 15051da177e4SLinus Torvalds hub->has_indicators = 1; 15061da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 15071da177e4SLinus Torvalds } 15081da177e4SLinus Torvalds 15091da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 15101da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 15111da177e4SLinus Torvalds 15121da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 15131da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 15141da177e4SLinus Torvalds */ 15151da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 151615b7336eSAlan Stern if (ret) { 15171da177e4SLinus Torvalds message = "can't get hub status"; 15181da177e4SLinus Torvalds goto fail; 15191da177e4SLinus Torvalds } 1520430ee58eSSebastian Andrzej Siewior hcd = bus_to_hcd(hdev->bus); 15217d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 1522430ee58eSSebastian Andrzej Siewior if (hcd->power_budget > 0) 1523430ee58eSSebastian Andrzej Siewior hdev->bus_mA = hcd->power_budget; 1524430ee58eSSebastian Andrzej Siewior else 1525d8521afeSDan Williams hdev->bus_mA = full_load * maxchild; 1526430ee58eSSebastian Andrzej Siewior if (hdev->bus_mA >= full_load) 1527430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 152855c52718SAlan Stern else { 152955c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 153055c52718SAlan Stern hub->limited_power = 1; 153155c52718SAlan Stern } 15327d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 153355c52718SAlan Stern int remaining = hdev->bus_mA - 153455c52718SAlan Stern hub->descriptor->bHubContrCurrent; 15351da177e4SLinus Torvalds 1536430ee58eSSebastian Andrzej Siewior dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 1537430ee58eSSebastian Andrzej Siewior hub->descriptor->bHubContrCurrent); 1538430ee58eSSebastian Andrzej Siewior hub->limited_power = 1; 1539430ee58eSSebastian Andrzej Siewior 1540d8521afeSDan Williams if (remaining < maxchild * unit_load) 154155c52718SAlan Stern dev_warn(hub_dev, 154255c52718SAlan Stern "insufficient power available " 154355c52718SAlan Stern "to use all downstream ports\n"); 1544430ee58eSSebastian Andrzej Siewior hub->mA_per_port = unit_load; /* 7.2.1 */ 1545430ee58eSSebastian Andrzej Siewior 154655c52718SAlan Stern } else { /* Self-powered external hub */ 154755c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 154855c52718SAlan Stern * provide less current per port? */ 1549430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 155055c52718SAlan Stern } 1551430ee58eSSebastian Andrzej Siewior if (hub->mA_per_port < full_load) 155255c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 155355c52718SAlan Stern hub->mA_per_port); 15541da177e4SLinus Torvalds 15551da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 15561da177e4SLinus Torvalds if (ret < 0) { 15571da177e4SLinus Torvalds message = "can't get hub status"; 15581da177e4SLinus Torvalds goto fail; 15591da177e4SLinus Torvalds } 15601da177e4SLinus Torvalds 15611da177e4SLinus Torvalds /* local power status reports aren't always correct */ 15621da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 15631da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 15641da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 15651da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 15661da177e4SLinus Torvalds 156774ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 15681da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 15691da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 15701da177e4SLinus Torvalds 157188fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 157288fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 157388fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 157488fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 157588fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 157688fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 15771da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 15781da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 15791da177e4SLinus Torvalds 15801da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 15811da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 15821da177e4SLinus Torvalds 15831da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 15841da177e4SLinus Torvalds if (!hub->urb) { 15851da177e4SLinus Torvalds ret = -ENOMEM; 15861da177e4SLinus Torvalds goto fail; 15871da177e4SLinus Torvalds } 15881da177e4SLinus Torvalds 15891da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 15901da177e4SLinus Torvalds hub, endpoint->bInterval); 15911da177e4SLinus Torvalds 15921da177e4SLinus Torvalds /* maybe cycle the hub leds */ 15931da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 15941da177e4SLinus Torvalds hub->indicator[0] = INDICATOR_CYCLE; 15951da177e4SLinus Torvalds 1596d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 1597d8521afeSDan Williams for (i = 0; i < maxchild; i++) { 1598e58547ebSKrzysztof Mazur ret = usb_hub_create_port_device(hub, i + 1); 1599e58547ebSKrzysztof Mazur if (ret < 0) { 1600fa2a9566SLan Tianyu dev_err(hub->intfdev, 1601fa2a9566SLan Tianyu "couldn't create port%d device.\n", i + 1); 1602d8521afeSDan Williams break; 1603d8521afeSDan Williams } 1604d8521afeSDan Williams } 1605e58547ebSKrzysztof Mazur hdev->maxchild = i; 1606e3d10505SDan Williams for (i = 0; i < hdev->maxchild; i++) { 1607e3d10505SDan Williams struct usb_port *port_dev = hub->ports[i]; 1608e3d10505SDan Williams 1609e3d10505SDan Williams pm_runtime_put(&port_dev->dev); 1610e3d10505SDan Williams } 1611e3d10505SDan Williams 1612d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 1613d8521afeSDan Williams if (ret < 0) 1614d8521afeSDan Williams goto fail; 1615fa2a9566SLan Tianyu 161637ebb549SPetr Mladek /* Update the HCD's internal representation of this hub before hub_wq 1617e3d95580SDan Williams * starts getting port status changes for devices under the hub. 1618e3d95580SDan Williams */ 1619e3d95580SDan Williams if (hcd->driver->update_hub_device) { 1620e3d95580SDan Williams ret = hcd->driver->update_hub_device(hcd, hdev, 1621e3d95580SDan Williams &hub->tt, GFP_KERNEL); 1622e3d95580SDan Williams if (ret < 0) { 1623e3d95580SDan Williams message = "can't update HCD hub info"; 1624e3d95580SDan Williams goto fail; 1625e3d95580SDan Williams } 1626e3d95580SDan Williams } 1627e3d95580SDan Williams 1628d2123fd9SLan Tianyu usb_hub_adjust_deviceremovable(hdev, hub->descriptor); 1629d2123fd9SLan Tianyu 1630f2835219SAlan Stern hub_activate(hub, HUB_INIT); 16311da177e4SLinus Torvalds return 0; 16321da177e4SLinus Torvalds 16331da177e4SLinus Torvalds fail: 16341da177e4SLinus Torvalds dev_err(hub_dev, "config failed, %s (err %d)\n", 16351da177e4SLinus Torvalds message, ret); 16361da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 16371da177e4SLinus Torvalds return ret; 16381da177e4SLinus Torvalds } 16391da177e4SLinus Torvalds 1640e8054854SAlan Stern static void hub_release(struct kref *kref) 1641e8054854SAlan Stern { 1642e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 1643e8054854SAlan Stern 16445d14f323SPetr Mladek usb_put_dev(hub->hdev); 1645e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 1646e8054854SAlan Stern kfree(hub); 1647e8054854SAlan Stern } 1648e8054854SAlan Stern 16491da177e4SLinus Torvalds static unsigned highspeed_hubs; 16501da177e4SLinus Torvalds 16511da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 16521da177e4SLinus Torvalds { 16531da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 1654fa286188SGreg Kroah-Hartman struct usb_device *hdev = interface_to_usbdev(intf); 1655543d7784SAlan Stern int port1; 1656fa2a9566SLan Tianyu 165732a69589SPetr Mladek /* 165832a69589SPetr Mladek * Stop adding new hub events. We do not want to block here and thus 165932a69589SPetr Mladek * will not try to remove any pending work item. 166032a69589SPetr Mladek */ 1661e8054854SAlan Stern hub->disconnected = 1; 16621da177e4SLinus Torvalds 16637de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 16647de18d8bSAlan Stern hub->error = 0; 16654330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 16667de18d8bSAlan Stern 1667d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 1668d8521afeSDan Williams 1669543d7784SAlan Stern /* Avoid races with recursively_mark_NOTATTACHED() */ 1670543d7784SAlan Stern spin_lock_irq(&device_state_lock); 1671543d7784SAlan Stern port1 = hdev->maxchild; 1672543d7784SAlan Stern hdev->maxchild = 0; 16738b28c752SAlan Stern usb_set_intfdata(intf, NULL); 1674543d7784SAlan Stern spin_unlock_irq(&device_state_lock); 16751f2235b8SAlexander Shishkin 1676543d7784SAlan Stern for (; port1 > 0; --port1) 1677543d7784SAlan Stern usb_hub_remove_port_device(hub, port1); 16781da177e4SLinus Torvalds 1679d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 1680d8521afeSDan Williams 1681e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 16821da177e4SLinus Torvalds highspeed_hubs--; 16831da177e4SLinus Torvalds 16841da177e4SLinus Torvalds usb_free_urb(hub->urb); 1685fa2a9566SLan Tianyu kfree(hub->ports); 16861da177e4SLinus Torvalds kfree(hub->descriptor); 16871da177e4SLinus Torvalds kfree(hub->status); 1688d697cddaSAlan Stern kfree(hub->buffer); 16891da177e4SLinus Torvalds 1690971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, false); 1691e8054854SAlan Stern kref_put(&hub->kref, hub_release); 16921da177e4SLinus Torvalds } 16931da177e4SLinus Torvalds 16941da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 16951da177e4SLinus Torvalds { 16961da177e4SLinus Torvalds struct usb_host_interface *desc; 16971da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 16981da177e4SLinus Torvalds struct usb_device *hdev; 16991da177e4SLinus Torvalds struct usb_hub *hub; 17001da177e4SLinus Torvalds 17011da177e4SLinus Torvalds desc = intf->cur_altsetting; 17021da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 17031da177e4SLinus Torvalds 1704596d789aSMing Lei /* 1705596d789aSMing Lei * Set default autosuspend delay as 0 to speedup bus suspend, 1706596d789aSMing Lei * based on the below considerations: 1707596d789aSMing Lei * 1708596d789aSMing Lei * - Unlike other drivers, the hub driver does not rely on the 1709596d789aSMing Lei * autosuspend delay to provide enough time to handle a wakeup 1710596d789aSMing Lei * event, and the submitted status URB is just to check future 1711596d789aSMing Lei * change on hub downstream ports, so it is safe to do it. 1712596d789aSMing Lei * 1713596d789aSMing Lei * - The patch might cause one or more auto supend/resume for 1714596d789aSMing Lei * below very rare devices when they are plugged into hub 1715596d789aSMing Lei * first time: 1716596d789aSMing Lei * 1717596d789aSMing Lei * devices having trouble initializing, and disconnect 1718596d789aSMing Lei * themselves from the bus and then reconnect a second 1719596d789aSMing Lei * or so later 1720596d789aSMing Lei * 1721596d789aSMing Lei * devices just for downloading firmware, and disconnects 1722596d789aSMing Lei * themselves after completing it 1723596d789aSMing Lei * 1724596d789aSMing Lei * For these quite rare devices, their drivers may change the 1725596d789aSMing Lei * autosuspend delay of their parent hub in the probe() to one 1726596d789aSMing Lei * appropriate value to avoid the subtle problem if someone 1727596d789aSMing Lei * does care it. 1728596d789aSMing Lei * 1729596d789aSMing Lei * - The patch may cause one or more auto suspend/resume on 1730596d789aSMing Lei * hub during running 'lsusb', but it is probably too 1731596d789aSMing Lei * infrequent to worry about. 1732596d789aSMing Lei * 1733596d789aSMing Lei * - Change autosuspend delay of hub can avoid unnecessary auto 1734596d789aSMing Lei * suspend timer for hub, also may decrease power consumption 1735596d789aSMing Lei * of USB bus. 1736bdd405d2SRoger Quadros * 1737bdd405d2SRoger Quadros * - If user has indicated to prevent autosuspend by passing 1738bdd405d2SRoger Quadros * usbcore.autosuspend = -1 then keep autosuspend disabled. 1739596d789aSMing Lei */ 1740ceb6c9c8SRafael J. Wysocki #ifdef CONFIG_PM 1741bdd405d2SRoger Quadros if (hdev->dev.power.autosuspend_delay >= 0) 1742596d789aSMing Lei pm_runtime_set_autosuspend_delay(&hdev->dev, 0); 1743a9ef803dSGreg Kroah-Hartman #endif 1744596d789aSMing Lei 17458ef42dddSAlan Stern /* 17468ef42dddSAlan Stern * Hubs have proper suspend/resume support, except for root hubs 17478ef42dddSAlan Stern * where the controller driver doesn't have bus_suspend and 17488ef42dddSAlan Stern * bus_resume methods. 17498ef42dddSAlan Stern */ 17508ef42dddSAlan Stern if (hdev->parent) { /* normal device */ 1751088f7fecSAlan Stern usb_enable_autosuspend(hdev); 17528ef42dddSAlan Stern } else { /* root hub */ 17538ef42dddSAlan Stern const struct hc_driver *drv = bus_to_hcd(hdev->bus)->driver; 17548ef42dddSAlan Stern 17558ef42dddSAlan Stern if (drv->bus_suspend && drv->bus_resume) 17568ef42dddSAlan Stern usb_enable_autosuspend(hdev); 17578ef42dddSAlan Stern } 1758088f7fecSAlan Stern 175938f3ad5eSFelipe Balbi if (hdev->level == MAX_TOPO_LEVEL) { 1760b9cef6c3SWu Fengguang dev_err(&intf->dev, 1761b9cef6c3SWu Fengguang "Unsupported bus topology: hub nested too deep\n"); 176238f3ad5eSFelipe Balbi return -E2BIG; 176338f3ad5eSFelipe Balbi } 176438f3ad5eSFelipe Balbi 176589ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 176689ccbdc9SDavid Brownell if (hdev->parent) { 176789ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 176889ccbdc9SDavid Brownell return -ENODEV; 176989ccbdc9SDavid Brownell } 177089ccbdc9SDavid Brownell #endif 177189ccbdc9SDavid Brownell 17721da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 17731da177e4SLinus Torvalds /* specs is not defined, but it works */ 17741da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 17751da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 17761da177e4SLinus Torvalds descriptor_error: 17771da177e4SLinus Torvalds dev_err(&intf->dev, "bad descriptor, ignoring hub\n"); 17781da177e4SLinus Torvalds return -EIO; 17791da177e4SLinus Torvalds } 17801da177e4SLinus Torvalds 17811da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 17821da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 17831da177e4SLinus Torvalds goto descriptor_error; 17841da177e4SLinus Torvalds 17851da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 17861da177e4SLinus Torvalds 1787fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 1788fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 17891da177e4SLinus Torvalds goto descriptor_error; 17901da177e4SLinus Torvalds 17911da177e4SLinus Torvalds /* We found a hub */ 17921da177e4SLinus Torvalds dev_info(&intf->dev, "USB hub found\n"); 17931da177e4SLinus Torvalds 17940a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 17951da177e4SLinus Torvalds if (!hub) { 17961da177e4SLinus Torvalds dev_dbg(&intf->dev, "couldn't kmalloc hub struct\n"); 17971da177e4SLinus Torvalds return -ENOMEM; 17981da177e4SLinus Torvalds } 17991da177e4SLinus Torvalds 1800e8054854SAlan Stern kref_init(&hub->kref); 18011da177e4SLinus Torvalds hub->intfdev = &intf->dev; 18021da177e4SLinus Torvalds hub->hdev = hdev; 1803c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 18048520f380SAlan Stern INIT_DELAYED_WORK(&hub->init_work, NULL); 180532a69589SPetr Mladek INIT_WORK(&hub->events, hub_event); 1806e8054854SAlan Stern usb_get_intf(intf); 18075d14f323SPetr Mladek usb_get_dev(hdev); 18081da177e4SLinus Torvalds 18091da177e4SLinus Torvalds usb_set_intfdata(intf, hub); 181040f122f3SAlan Stern intf->needs_remote_wakeup = 1; 1811971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, true); 18121da177e4SLinus Torvalds 18131da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 18141da177e4SLinus Torvalds highspeed_hubs++; 18151da177e4SLinus Torvalds 1816e6f30deaSMing Lei if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) 1817e6f30deaSMing Lei hub->quirk_check_port_auto_suspend = 1; 1818e6f30deaSMing Lei 18191da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 18201da177e4SLinus Torvalds return 0; 18211da177e4SLinus Torvalds 18221da177e4SLinus Torvalds hub_disconnect(intf); 18231da177e4SLinus Torvalds return -ENODEV; 18241da177e4SLinus Torvalds } 18251da177e4SLinus Torvalds 18261da177e4SLinus Torvalds static int 18271da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 18281da177e4SLinus Torvalds { 18291da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev(intf); 1830ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 18311da177e4SLinus Torvalds 18321da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 18331da177e4SLinus Torvalds switch (code) { 18341da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 18351da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 18361da177e4SLinus Torvalds int i; 18371da177e4SLinus Torvalds 18381da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 18391da177e4SLinus Torvalds if (hdev->devnum <= 0) 18401da177e4SLinus Torvalds info->nports = 0; 18411da177e4SLinus Torvalds else { 18421da177e4SLinus Torvalds info->nports = hdev->maxchild; 18431da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 1844ff823c79SLan Tianyu if (hub->ports[i]->child == NULL) 18451da177e4SLinus Torvalds info->port[i] = 0; 18461da177e4SLinus Torvalds else 18471da177e4SLinus Torvalds info->port[i] = 1848ff823c79SLan Tianyu hub->ports[i]->child->devnum; 18491da177e4SLinus Torvalds } 18501da177e4SLinus Torvalds } 18511da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 18521da177e4SLinus Torvalds 18531da177e4SLinus Torvalds return info->nports + 1; 18541da177e4SLinus Torvalds } 18551da177e4SLinus Torvalds 18561da177e4SLinus Torvalds default: 18571da177e4SLinus Torvalds return -ENOSYS; 18581da177e4SLinus Torvalds } 18591da177e4SLinus Torvalds } 18601da177e4SLinus Torvalds 18617cbe5dcaSAlan Stern /* 18627cbe5dcaSAlan Stern * Allow user programs to claim ports on a hub. When a device is attached 18637cbe5dcaSAlan Stern * to one of these "claimed" ports, the program will "own" the device. 18647cbe5dcaSAlan Stern */ 18657cbe5dcaSAlan Stern static int find_port_owner(struct usb_device *hdev, unsigned port1, 18669b6f0c4bSValentina Manea struct usb_dev_state ***ppowner) 18677cbe5dcaSAlan Stern { 186841341261SMathias Nyman struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 186941341261SMathias Nyman 18707cbe5dcaSAlan Stern if (hdev->state == USB_STATE_NOTATTACHED) 18717cbe5dcaSAlan Stern return -ENODEV; 18727cbe5dcaSAlan Stern if (port1 == 0 || port1 > hdev->maxchild) 18737cbe5dcaSAlan Stern return -EINVAL; 18747cbe5dcaSAlan Stern 187541341261SMathias Nyman /* Devices not managed by the hub driver 18767cbe5dcaSAlan Stern * will always have maxchild equal to 0. 18777cbe5dcaSAlan Stern */ 187841341261SMathias Nyman *ppowner = &(hub->ports[port1 - 1]->port_owner); 18797cbe5dcaSAlan Stern return 0; 18807cbe5dcaSAlan Stern } 18817cbe5dcaSAlan Stern 18827cbe5dcaSAlan Stern /* In the following three functions, the caller must hold hdev's lock */ 1883336c5c31SLan Tianyu int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, 18849b6f0c4bSValentina Manea struct usb_dev_state *owner) 18857cbe5dcaSAlan Stern { 18867cbe5dcaSAlan Stern int rc; 18879b6f0c4bSValentina Manea struct usb_dev_state **powner; 18887cbe5dcaSAlan Stern 18897cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 18907cbe5dcaSAlan Stern if (rc) 18917cbe5dcaSAlan Stern return rc; 18927cbe5dcaSAlan Stern if (*powner) 18937cbe5dcaSAlan Stern return -EBUSY; 18947cbe5dcaSAlan Stern *powner = owner; 18957cbe5dcaSAlan Stern return rc; 18967cbe5dcaSAlan Stern } 18976080cd0eSValentina Manea EXPORT_SYMBOL_GPL(usb_hub_claim_port); 18987cbe5dcaSAlan Stern 1899336c5c31SLan Tianyu int usb_hub_release_port(struct usb_device *hdev, unsigned port1, 19009b6f0c4bSValentina Manea struct usb_dev_state *owner) 19017cbe5dcaSAlan Stern { 19027cbe5dcaSAlan Stern int rc; 19039b6f0c4bSValentina Manea struct usb_dev_state **powner; 19047cbe5dcaSAlan Stern 19057cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 19067cbe5dcaSAlan Stern if (rc) 19077cbe5dcaSAlan Stern return rc; 19087cbe5dcaSAlan Stern if (*powner != owner) 19097cbe5dcaSAlan Stern return -ENOENT; 19107cbe5dcaSAlan Stern *powner = NULL; 19117cbe5dcaSAlan Stern return rc; 19127cbe5dcaSAlan Stern } 19136080cd0eSValentina Manea EXPORT_SYMBOL_GPL(usb_hub_release_port); 19147cbe5dcaSAlan Stern 19159b6f0c4bSValentina Manea void usb_hub_release_all_ports(struct usb_device *hdev, struct usb_dev_state *owner) 19167cbe5dcaSAlan Stern { 1917ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 19187cbe5dcaSAlan Stern int n; 19197cbe5dcaSAlan Stern 1920fa2a9566SLan Tianyu for (n = 0; n < hdev->maxchild; n++) { 1921fa2a9566SLan Tianyu if (hub->ports[n]->port_owner == owner) 1922fa2a9566SLan Tianyu hub->ports[n]->port_owner = NULL; 19237cbe5dcaSAlan Stern } 1924fa2a9566SLan Tianyu 19257cbe5dcaSAlan Stern } 19267cbe5dcaSAlan Stern 19277cbe5dcaSAlan Stern /* The caller must hold udev's lock */ 19287cbe5dcaSAlan Stern bool usb_device_is_owned(struct usb_device *udev) 19297cbe5dcaSAlan Stern { 19307cbe5dcaSAlan Stern struct usb_hub *hub; 19317cbe5dcaSAlan Stern 19327cbe5dcaSAlan Stern if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) 19337cbe5dcaSAlan Stern return false; 1934ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 1935fa2a9566SLan Tianyu return !!hub->ports[udev->portnum - 1]->port_owner; 19367cbe5dcaSAlan Stern } 19377cbe5dcaSAlan Stern 19381da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 19391da177e4SLinus Torvalds { 1940ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev); 19411da177e4SLinus Torvalds int i; 19421da177e4SLinus Torvalds 19431da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 1944ff823c79SLan Tianyu if (hub->ports[i]->child) 1945ff823c79SLan Tianyu recursively_mark_NOTATTACHED(hub->ports[i]->child); 19461da177e4SLinus Torvalds } 19479bbdf1e0SAlan Stern if (udev->state == USB_STATE_SUSPENDED) 194815123006SSarah Sharp udev->active_duration -= jiffies; 19491da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 19501da177e4SLinus Torvalds } 19511da177e4SLinus Torvalds 19521da177e4SLinus Torvalds /** 19531da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 19541da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 19551da177e4SLinus Torvalds * @new_state: new state value to be stored 19561da177e4SLinus Torvalds * 19571da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 19581da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 19591da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 19601da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 19611da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 19621da177e4SLinus Torvalds * all changes to any device's state must be protected by the 19631da177e4SLinus Torvalds * device_state_lock spinlock. 19641da177e4SLinus Torvalds * 19651da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 19661da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 19671da177e4SLinus Torvalds * 19681da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 19691da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 19701da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 19711da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 19721da177e4SLinus Torvalds */ 19731da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 19741da177e4SLinus Torvalds enum usb_device_state new_state) 19751da177e4SLinus Torvalds { 19761da177e4SLinus Torvalds unsigned long flags; 19774681b171SRafael J. Wysocki int wakeup = -1; 19781da177e4SLinus Torvalds 19791da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 19801da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 19811da177e4SLinus Torvalds ; /* do nothing */ 1982b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1983fb669cc0SDavid Brownell 1984fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1985fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1986fb669cc0SDavid Brownell */ 1987fb669cc0SDavid Brownell if (udev->parent) { 1988645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1989645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1990645daaabSAlan Stern ; /* No change to wakeup settings */ 1991645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 1992ddbe1fcaSLu Baolu wakeup = (udev->quirks & 1993ddbe1fcaSLu Baolu USB_QUIRK_IGNORE_REMOTE_WAKEUP) ? 0 : 1994ddbe1fcaSLu Baolu udev->actconfig->desc.bmAttributes & 1995ddbe1fcaSLu Baolu USB_CONFIG_ATT_WAKEUP; 1996645daaabSAlan Stern else 19974681b171SRafael J. Wysocki wakeup = 0; 1998fb669cc0SDavid Brownell } 199915123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED && 200015123006SSarah Sharp new_state != USB_STATE_SUSPENDED) 200115123006SSarah Sharp udev->active_duration -= jiffies; 200215123006SSarah Sharp else if (new_state == USB_STATE_SUSPENDED && 200315123006SSarah Sharp udev->state != USB_STATE_SUSPENDED) 200415123006SSarah Sharp udev->active_duration += jiffies; 2005645daaabSAlan Stern udev->state = new_state; 2006b94dc6b5SDavid Brownell } else 20071da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 20081da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 20094681b171SRafael J. Wysocki if (wakeup >= 0) 20104681b171SRafael J. Wysocki device_set_wakeup_capable(&udev->dev, wakeup); 20111da177e4SLinus Torvalds } 20126da9c990SDavid Vrabel EXPORT_SYMBOL_GPL(usb_set_device_state); 20131da177e4SLinus Torvalds 20148af548dcSInaky Perez-Gonzalez /* 20153b29b68bSAlan Stern * Choose a device number. 20163b29b68bSAlan Stern * 20173b29b68bSAlan Stern * Device numbers are used as filenames in usbfs. On USB-1.1 and 20183b29b68bSAlan Stern * USB-2.0 buses they are also used as device addresses, however on 20193b29b68bSAlan Stern * USB-3.0 buses the address is assigned by the controller hardware 20203b29b68bSAlan Stern * and it usually is not the same as the device number. 20213b29b68bSAlan Stern * 20228af548dcSInaky Perez-Gonzalez * WUSB devices are simple: they have no hubs behind, so the mapping 20238af548dcSInaky Perez-Gonzalez * device <-> virtual port number becomes 1:1. Why? to simplify the 20248af548dcSInaky Perez-Gonzalez * life of the device connection logic in 20258af548dcSInaky Perez-Gonzalez * drivers/usb/wusbcore/devconnect.c. When we do the initial secret 20268af548dcSInaky Perez-Gonzalez * handshake we need to assign a temporary address in the unauthorized 20278af548dcSInaky Perez-Gonzalez * space. For simplicity we use the first virtual port number found to 20288af548dcSInaky Perez-Gonzalez * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] 20298af548dcSInaky Perez-Gonzalez * and that becomes it's address [X < 128] or its unauthorized address 20308af548dcSInaky Perez-Gonzalez * [X | 0x80]. 20318af548dcSInaky Perez-Gonzalez * 20328af548dcSInaky Perez-Gonzalez * We add 1 as an offset to the one-based USB-stack port number 20338af548dcSInaky Perez-Gonzalez * (zero-based wusb virtual port index) for two reasons: (a) dev addr 20348af548dcSInaky Perez-Gonzalez * 0 is reserved by USB for default address; (b) Linux's USB stack 20358af548dcSInaky Perez-Gonzalez * uses always #1 for the root hub of the controller. So USB stack's 20368af548dcSInaky Perez-Gonzalez * port #1, which is wusb virtual-port #0 has address #2. 2037c6515272SSarah Sharp * 2038c6515272SSarah Sharp * Devices connected under xHCI are not as simple. The host controller 2039c6515272SSarah Sharp * supports virtualization, so the hardware assigns device addresses and 2040c6515272SSarah Sharp * the HCD must setup data structures before issuing a set address 2041c6515272SSarah Sharp * command to the hardware. 20428af548dcSInaky Perez-Gonzalez */ 20433b29b68bSAlan Stern static void choose_devnum(struct usb_device *udev) 20441da177e4SLinus Torvalds { 20451da177e4SLinus Torvalds int devnum; 20461da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 20471da177e4SLinus Torvalds 2048638139ebSPetr Mladek /* be safe when more hub events are proceed in parallel */ 2049638139ebSPetr Mladek mutex_lock(&bus->usb_address0_mutex); 20508af548dcSInaky Perez-Gonzalez if (udev->wusb) { 20518af548dcSInaky Perez-Gonzalez devnum = udev->portnum + 1; 20528af548dcSInaky Perez-Gonzalez BUG_ON(test_bit(devnum, bus->devmap.devicemap)); 20538af548dcSInaky Perez-Gonzalez } else { 20548af548dcSInaky Perez-Gonzalez /* Try to allocate the next devnum beginning at 20558af548dcSInaky Perez-Gonzalez * bus->devnum_next. */ 20561da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 20571da177e4SLinus Torvalds bus->devnum_next); 20581da177e4SLinus Torvalds if (devnum >= 128) 20598af548dcSInaky Perez-Gonzalez devnum = find_next_zero_bit(bus->devmap.devicemap, 20608af548dcSInaky Perez-Gonzalez 128, 1); 20611da177e4SLinus Torvalds bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1); 20628af548dcSInaky Perez-Gonzalez } 20631da177e4SLinus Torvalds if (devnum < 128) { 20641da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 20651da177e4SLinus Torvalds udev->devnum = devnum; 20661da177e4SLinus Torvalds } 2067638139ebSPetr Mladek mutex_unlock(&bus->usb_address0_mutex); 20681da177e4SLinus Torvalds } 20691da177e4SLinus Torvalds 20703b29b68bSAlan Stern static void release_devnum(struct usb_device *udev) 20711da177e4SLinus Torvalds { 20721da177e4SLinus Torvalds if (udev->devnum > 0) { 20731da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 20741da177e4SLinus Torvalds udev->devnum = -1; 20751da177e4SLinus Torvalds } 20761da177e4SLinus Torvalds } 20771da177e4SLinus Torvalds 20783b29b68bSAlan Stern static void update_devnum(struct usb_device *udev, int devnum) 20794953d141SDavid Vrabel { 20804953d141SDavid Vrabel /* The address for a WUSB device is managed by wusbcore. */ 20814953d141SDavid Vrabel if (!udev->wusb) 20824953d141SDavid Vrabel udev->devnum = devnum; 20834953d141SDavid Vrabel } 20844953d141SDavid Vrabel 2085f7410cedSHerbert Xu static void hub_free_dev(struct usb_device *udev) 2086f7410cedSHerbert Xu { 2087f7410cedSHerbert Xu struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2088f7410cedSHerbert Xu 2089f7410cedSHerbert Xu /* Root hubs aren't real devices, so don't free HCD resources */ 2090f7410cedSHerbert Xu if (hcd->driver->free_dev && udev->parent) 2091f7410cedSHerbert Xu hcd->driver->free_dev(hcd, udev); 2092f7410cedSHerbert Xu } 2093f7410cedSHerbert Xu 20947027df36SDan Williams static void hub_disconnect_children(struct usb_device *udev) 20957027df36SDan Williams { 20967027df36SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(udev); 20977027df36SDan Williams int i; 20987027df36SDan Williams 20997027df36SDan Williams /* Free up all the children before we remove this device */ 21007027df36SDan Williams for (i = 0; i < udev->maxchild; i++) { 21017027df36SDan Williams if (hub->ports[i]->child) 21027027df36SDan Williams usb_disconnect(&hub->ports[i]->child); 21037027df36SDan Williams } 21047027df36SDan Williams } 21057027df36SDan Williams 21061da177e4SLinus Torvalds /** 21071da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 21081da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 21091da177e4SLinus Torvalds * Context: !in_interrupt () 21101da177e4SLinus Torvalds * 21111da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 21121da177e4SLinus Torvalds * 21131da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 2114db8f2aa3SBjorn Helgaas * If *pdev is a root hub then the caller must hold the usb_bus_list_lock, 2115db8f2aa3SBjorn Helgaas * which protects the set of root hubs as well as the list of buses. 21161da177e4SLinus Torvalds * 21171da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 21181da177e4SLinus Torvalds * controllers) should ever call this. 21191da177e4SLinus Torvalds * 21201da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 21211da177e4SLinus Torvalds */ 21221da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 21231da177e4SLinus Torvalds { 21247027df36SDan Williams struct usb_port *port_dev = NULL; 21251da177e4SLinus Torvalds struct usb_device *udev = *pdev; 21265b1dc209SPeter Chen struct usb_hub *hub = NULL; 21275b1dc209SPeter Chen int port1 = 1; 21281da177e4SLinus Torvalds 21291da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 21301da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 213125985edcSLucas De Marchi * this quiesces everything except pending urbs. 21321da177e4SLinus Torvalds */ 21331da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 21343b29b68bSAlan Stern dev_info(&udev->dev, "USB disconnect, device number %d\n", 21353b29b68bSAlan Stern udev->devnum); 21361da177e4SLinus Torvalds 21379ad3d6ccSAlan Stern usb_lock_device(udev); 21389ad3d6ccSAlan Stern 21397027df36SDan Williams hub_disconnect_children(udev); 21401da177e4SLinus Torvalds 21411da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 21421da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 21431da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 21441da177e4SLinus Torvalds */ 2145782da727SAlan Stern dev_dbg(&udev->dev, "unregistering device\n"); 21461da177e4SLinus Torvalds usb_disable_device(udev, 0); 2147cde217a5SAlan Stern usb_hcd_synchronize_unlinks(udev); 21481da177e4SLinus Torvalds 2149fde26380SLan Tianyu if (udev->parent) { 21507027df36SDan Williams port1 = udev->portnum; 21517027df36SDan Williams hub = usb_hub_to_struct_hub(udev->parent); 21527027df36SDan Williams port_dev = hub->ports[port1 - 1]; 2153fde26380SLan Tianyu 2154fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2155fde26380SLan Tianyu sysfs_remove_link(&port_dev->dev.kobj, "device"); 2156971fcd49SLan Tianyu 21577027df36SDan Williams /* 21587027df36SDan Williams * As usb_port_runtime_resume() de-references udev, make 21597027df36SDan Williams * sure no resumes occur during removal 21607027df36SDan Williams */ 21617027df36SDan Williams if (!test_and_set_bit(port1, hub->child_usage_bits)) 21627027df36SDan Williams pm_runtime_get_sync(&port_dev->dev); 2163fde26380SLan Tianyu } 2164fde26380SLan Tianyu 21653b23dd6fSAlan Stern usb_remove_ep_devs(&udev->ep0); 2166782da727SAlan Stern usb_unlock_device(udev); 21673099e75aSGreg Kroah-Hartman 2168782da727SAlan Stern /* Unregister the device. The device driver is responsible 21693b23dd6fSAlan Stern * for de-configuring the device and invoking the remove-device 21703b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2171782da727SAlan Stern */ 2172782da727SAlan Stern device_del(&udev->dev); 2173782da727SAlan Stern 2174782da727SAlan Stern /* Free the device number and delete the parent's children[] 21751da177e4SLinus Torvalds * (or root_hub) pointer. 21761da177e4SLinus Torvalds */ 21773b29b68bSAlan Stern release_devnum(udev); 21781da177e4SLinus Torvalds 21791da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 21801da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 21811da177e4SLinus Torvalds *pdev = NULL; 21821da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 21831da177e4SLinus Torvalds 21847027df36SDan Williams if (port_dev && test_and_clear_bit(port1, hub->child_usage_bits)) 21857027df36SDan Williams pm_runtime_put(&port_dev->dev); 21867027df36SDan Williams 2187f7410cedSHerbert Xu hub_free_dev(udev); 2188f7410cedSHerbert Xu 2189782da727SAlan Stern put_device(&udev->dev); 21901da177e4SLinus Torvalds } 21911da177e4SLinus Torvalds 2192f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 21931da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 21941da177e4SLinus Torvalds { 21951da177e4SLinus Torvalds if (!string) 21961da177e4SLinus Torvalds return; 2197f2ec522eSJoe Perches dev_info(&udev->dev, "%s: %s\n", id, string); 21981da177e4SLinus Torvalds } 21991da177e4SLinus Torvalds 2200f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 2201f2a383e4SGreg Kroah-Hartman { 2202f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", 2203f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 2204f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idProduct)); 2205b9cef6c3SWu Fengguang dev_info(&udev->dev, 2206b9cef6c3SWu Fengguang "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", 2207f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 2208f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 2209f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 2210f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 2211f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 2212f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 2213f2a383e4SGreg Kroah-Hartman } 22141da177e4SLinus Torvalds #else 2215f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 22161da177e4SLinus Torvalds #endif 22171da177e4SLinus Torvalds 22181da177e4SLinus Torvalds 22193ede760fSOliver Neukum /** 22208d8558d1SAlan Stern * usb_enumerate_device_otg - FIXME (usbcore-internal) 22213ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 22223ede760fSOliver Neukum * 22238d8558d1SAlan Stern * Finish enumeration for On-The-Go devices 2224626f090cSYacine Belkadi * 2225626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 22263ede760fSOliver Neukum */ 22278d8558d1SAlan Stern static int usb_enumerate_device_otg(struct usb_device *udev) 22281da177e4SLinus Torvalds { 2229d9d16e8aSInaky Perez-Gonzalez int err = 0; 22301da177e4SLinus Torvalds 22311da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 22321da177e4SLinus Torvalds /* 22331da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 22341da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 22351da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 22361da177e4SLinus Torvalds */ 22371da177e4SLinus Torvalds if (!udev->bus->is_b_host 22381da177e4SLinus Torvalds && udev->config 22391da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 22402eb5052eSFelipe Balbi struct usb_otg_descriptor *desc = NULL; 22411da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 224212c3da34SAlan Stern unsigned port1 = udev->portnum; 22431da177e4SLinus Torvalds 22447d2d641cSLi Jun /* descriptor may appear anywhere in config */ 22457d2d641cSLi Jun err = __usb_get_extra_descriptor(udev->rawdescriptors[0], 22467d2d641cSLi Jun le16_to_cpu(udev->config[0].desc.wTotalLength), 22477d2d641cSLi Jun USB_DT_OTG, (void **) &desc); 22487d2d641cSLi Jun if (err || !(desc->bmAttributes & USB_OTG_HNP)) 22497d2d641cSLi Jun return 0; 22507d2d641cSLi Jun 22517d2d641cSLi Jun dev_info(&udev->dev, "Dual-Role OTG device on %sHNP port\n", 22527d2d641cSLi Jun (port1 == bus->otg_port) ? "" : "non-"); 22531da177e4SLinus Torvalds 22541da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 22557d2d641cSLi Jun if (port1 == bus->otg_port) { 22561da177e4SLinus Torvalds bus->b_hnp_enable = 1; 22571da177e4SLinus Torvalds err = usb_control_msg(udev, 22581da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 22591da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 22607d2d641cSLi Jun USB_DEVICE_B_HNP_ENABLE, 22617d2d641cSLi Jun 0, NULL, 0, 22627d2d641cSLi Jun USB_CTRL_SET_TIMEOUT); 22631da177e4SLinus Torvalds if (err < 0) { 22647d2d641cSLi Jun /* 22657d2d641cSLi Jun * OTG MESSAGE: report errors here, 22661da177e4SLinus Torvalds * customize to match your product. 22671da177e4SLinus Torvalds */ 22687d2d641cSLi Jun dev_err(&udev->dev, "can't set HNP mode: %d\n", 22691da177e4SLinus Torvalds err); 22701da177e4SLinus Torvalds bus->b_hnp_enable = 0; 22711da177e4SLinus Torvalds } 22727d2d641cSLi Jun } else if (desc->bLength == sizeof 22737d2d641cSLi Jun (struct usb_otg_descriptor)) { 22747d2d641cSLi Jun /* Set a_alt_hnp_support for legacy otg device */ 22757d2d641cSLi Jun err = usb_control_msg(udev, 22767d2d641cSLi Jun usb_sndctrlpipe(udev, 0), 22777d2d641cSLi Jun USB_REQ_SET_FEATURE, 0, 22787d2d641cSLi Jun USB_DEVICE_A_ALT_HNP_SUPPORT, 22797d2d641cSLi Jun 0, NULL, 0, 22807d2d641cSLi Jun USB_CTRL_SET_TIMEOUT); 22817d2d641cSLi Jun if (err < 0) 22827d2d641cSLi Jun dev_err(&udev->dev, 22837d2d641cSLi Jun "set a_alt_hnp_support failed: %d\n", 22847d2d641cSLi Jun err); 22851da177e4SLinus Torvalds } 22861da177e4SLinus Torvalds } 22871da177e4SLinus Torvalds #endif 2288d9d16e8aSInaky Perez-Gonzalez return err; 2289d9d16e8aSInaky Perez-Gonzalez } 22901da177e4SLinus Torvalds 2291d9d16e8aSInaky Perez-Gonzalez 2292d9d16e8aSInaky Perez-Gonzalez /** 22938d8558d1SAlan Stern * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) 2294d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2295d9d16e8aSInaky Perez-Gonzalez * 2296d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 2297d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 2298d9d16e8aSInaky Perez-Gonzalez * environment. 2299d9d16e8aSInaky Perez-Gonzalez * 2300d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 2301d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 2302d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 2303626f090cSYacine Belkadi * 2304626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 2305d9d16e8aSInaky Perez-Gonzalez */ 23068d8558d1SAlan Stern static int usb_enumerate_device(struct usb_device *udev) 2307d9d16e8aSInaky Perez-Gonzalez { 2308d9d16e8aSInaky Perez-Gonzalez int err; 2309026f3fcbSPeter Chen struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2310d9d16e8aSInaky Perez-Gonzalez 2311d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 2312d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 2313d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 2314e9e88fb7SAlan Stern if (err != -ENODEV) 2315d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 2316d9d16e8aSInaky Perez-Gonzalez err); 231780da2e0dSLaurent Pinchart return err; 2318d9d16e8aSInaky Perez-Gonzalez } 2319d9d16e8aSInaky Perez-Gonzalez } 232083e83ecbSThomas Pugliese 2321d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 2322d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 2323d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 2324d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 2325d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 232683e83ecbSThomas Pugliese 23278d8558d1SAlan Stern err = usb_enumerate_device_otg(udev); 232880da2e0dSLaurent Pinchart if (err < 0) 2329d9d16e8aSInaky Perez-Gonzalez return err; 233080da2e0dSLaurent Pinchart 2331026f3fcbSPeter Chen if (IS_ENABLED(CONFIG_USB_OTG_WHITELIST) && hcd->tpl_support && 2332e5a9d621SPeter Chen !is_targeted(udev)) { 2333026f3fcbSPeter Chen /* Maybe it can talk to us, though we can't talk to it. 2334026f3fcbSPeter Chen * (Includes HNP test device.) 2335026f3fcbSPeter Chen */ 2336e5a9d621SPeter Chen if (IS_ENABLED(CONFIG_USB_OTG) && (udev->bus->b_hnp_enable 2337e5a9d621SPeter Chen || udev->bus->is_b_host)) { 2338026f3fcbSPeter Chen err = usb_port_suspend(udev, PMSG_AUTO_SUSPEND); 2339026f3fcbSPeter Chen if (err < 0) 2340026f3fcbSPeter Chen dev_dbg(&udev->dev, "HNP fail, %d\n", err); 2341026f3fcbSPeter Chen } 2342026f3fcbSPeter Chen return -ENOTSUPP; 2343026f3fcbSPeter Chen } 2344026f3fcbSPeter Chen 234580da2e0dSLaurent Pinchart usb_detect_interface_quirks(udev); 234680da2e0dSLaurent Pinchart 234780da2e0dSLaurent Pinchart return 0; 2348d9d16e8aSInaky Perez-Gonzalez } 2349d9d16e8aSInaky Perez-Gonzalez 2350d35e70d5SMatthew Garrett static void set_usb_port_removable(struct usb_device *udev) 2351d35e70d5SMatthew Garrett { 2352d35e70d5SMatthew Garrett struct usb_device *hdev = udev->parent; 2353d35e70d5SMatthew Garrett struct usb_hub *hub; 2354d35e70d5SMatthew Garrett u8 port = udev->portnum; 2355d35e70d5SMatthew Garrett u16 wHubCharacteristics; 2356d35e70d5SMatthew Garrett bool removable = true; 2357d35e70d5SMatthew Garrett 2358d35e70d5SMatthew Garrett if (!hdev) 2359d35e70d5SMatthew Garrett return; 2360d35e70d5SMatthew Garrett 2361ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 2362d35e70d5SMatthew Garrett 236392bfbf71SMatthew Garrett /* 236492bfbf71SMatthew Garrett * If the platform firmware has provided information about a port, 236592bfbf71SMatthew Garrett * use that to determine whether it's removable. 236692bfbf71SMatthew Garrett */ 236792bfbf71SMatthew Garrett switch (hub->ports[udev->portnum - 1]->connect_type) { 236892bfbf71SMatthew Garrett case USB_PORT_CONNECT_TYPE_HOT_PLUG: 236992bfbf71SMatthew Garrett udev->removable = USB_DEVICE_REMOVABLE; 237092bfbf71SMatthew Garrett return; 237192bfbf71SMatthew Garrett case USB_PORT_CONNECT_TYPE_HARD_WIRED: 237258339c2eSMatthew Garrett case USB_PORT_NOT_USED: 237392bfbf71SMatthew Garrett udev->removable = USB_DEVICE_FIXED; 237492bfbf71SMatthew Garrett return; 237558339c2eSMatthew Garrett default: 237658339c2eSMatthew Garrett break; 237792bfbf71SMatthew Garrett } 237892bfbf71SMatthew Garrett 237992bfbf71SMatthew Garrett /* 238092bfbf71SMatthew Garrett * Otherwise, check whether the hub knows whether a port is removable 238192bfbf71SMatthew Garrett * or not 238292bfbf71SMatthew Garrett */ 2383d35e70d5SMatthew Garrett wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 2384d35e70d5SMatthew Garrett 2385d35e70d5SMatthew Garrett if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) 2386d35e70d5SMatthew Garrett return; 2387d35e70d5SMatthew Garrett 2388d35e70d5SMatthew Garrett if (hub_is_superspeed(hdev)) { 2389ca3c1539SLan Tianyu if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) 2390ca3c1539SLan Tianyu & (1 << port)) 2391d35e70d5SMatthew Garrett removable = false; 2392d35e70d5SMatthew Garrett } else { 2393d35e70d5SMatthew Garrett if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) 2394d35e70d5SMatthew Garrett removable = false; 2395d35e70d5SMatthew Garrett } 2396d35e70d5SMatthew Garrett 2397d35e70d5SMatthew Garrett if (removable) 2398d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_REMOVABLE; 2399d35e70d5SMatthew Garrett else 2400d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_FIXED; 2401a4204ff0SDan Williams 2402d35e70d5SMatthew Garrett } 2403d9d16e8aSInaky Perez-Gonzalez 2404d9d16e8aSInaky Perez-Gonzalez /** 2405d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 2406d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2407d9d16e8aSInaky Perez-Gonzalez * 24088d8558d1SAlan Stern * This is called with devices which have been detected but not fully 24098d8558d1SAlan Stern * enumerated. The device descriptor is available, but not descriptors 2410d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 2411d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 2412d9d16e8aSInaky Perez-Gonzalez * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 2413d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 2414d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 2415d9d16e8aSInaky Perez-Gonzalez * 2416d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 2417d9d16e8aSInaky Perez-Gonzalez * 2418d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 2419626f090cSYacine Belkadi * 2420626f090cSYacine Belkadi * Return: Whether the device is configured properly or not. Zero if the 2421626f090cSYacine Belkadi * interface was registered with the driver core; else a negative errno 2422626f090cSYacine Belkadi * value. 2423626f090cSYacine Belkadi * 2424d9d16e8aSInaky Perez-Gonzalez */ 2425d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 2426d9d16e8aSInaky Perez-Gonzalez { 2427d9d16e8aSInaky Perez-Gonzalez int err; 2428d9d16e8aSInaky Perez-Gonzalez 242916985408SDan Streetman if (udev->parent) { 243016985408SDan Streetman /* Initialize non-root-hub device wakeup to disabled; 243116985408SDan Streetman * device (un)configuration controls wakeup capable 243216985408SDan Streetman * sysfs power/wakeup controls wakeup enabled/disabled 243316985408SDan Streetman */ 243416985408SDan Streetman device_init_wakeup(&udev->dev, 0); 243516985408SDan Streetman } 243616985408SDan Streetman 24379bbdf1e0SAlan Stern /* Tell the runtime-PM framework the device is active */ 24389bbdf1e0SAlan Stern pm_runtime_set_active(&udev->dev); 2439c08512c7SAlan Stern pm_runtime_get_noresume(&udev->dev); 2440fcc4a01eSAlan Stern pm_runtime_use_autosuspend(&udev->dev); 24419bbdf1e0SAlan Stern pm_runtime_enable(&udev->dev); 24429bbdf1e0SAlan Stern 2443c08512c7SAlan Stern /* By default, forbid autosuspend for all devices. It will be 2444c08512c7SAlan Stern * allowed for hubs during binding. 2445c08512c7SAlan Stern */ 2446c08512c7SAlan Stern usb_disable_autosuspend(udev); 2447c08512c7SAlan Stern 24488d8558d1SAlan Stern err = usb_enumerate_device(udev); /* Read descriptors */ 2449d9d16e8aSInaky Perez-Gonzalez if (err < 0) 2450d9d16e8aSInaky Perez-Gonzalez goto fail; 2451c6515272SSarah Sharp dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", 2452c6515272SSarah Sharp udev->devnum, udev->bus->busnum, 2453c6515272SSarah Sharp (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 24549f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 24559f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 24569f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 24579f8b17e6SKay Sievers 24586cd13201SAlan Stern /* Tell the world! */ 24596cd13201SAlan Stern announce_device(udev); 2460195af2ccSAlan Stern 2461b04b3156STheodore Ts'o if (udev->serial) 2462b04b3156STheodore Ts'o add_device_randomness(udev->serial, strlen(udev->serial)); 2463b04b3156STheodore Ts'o if (udev->product) 2464b04b3156STheodore Ts'o add_device_randomness(udev->product, strlen(udev->product)); 2465b04b3156STheodore Ts'o if (udev->manufacturer) 2466b04b3156STheodore Ts'o add_device_randomness(udev->manufacturer, 2467b04b3156STheodore Ts'o strlen(udev->manufacturer)); 2468b04b3156STheodore Ts'o 2469927bc916SRafael J. Wysocki device_enable_async_suspend(&udev->dev); 2470d35e70d5SMatthew Garrett 2471a4204ff0SDan Williams /* check whether the hub or firmware marks this port as non-removable */ 2472d35e70d5SMatthew Garrett if (udev->parent) 2473d35e70d5SMatthew Garrett set_usb_port_removable(udev); 2474d35e70d5SMatthew Garrett 2475782da727SAlan Stern /* Register the device. The device driver is responsible 24763b23dd6fSAlan Stern * for configuring the device and invoking the add-device 24773b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2478782da727SAlan Stern */ 24791da177e4SLinus Torvalds err = device_add(&udev->dev); 24801da177e4SLinus Torvalds if (err) { 24811da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 24821da177e4SLinus Torvalds goto fail; 24831da177e4SLinus Torvalds } 24849ad3d6ccSAlan Stern 2485fde26380SLan Tianyu /* Create link files between child device and usb port device. */ 2486fde26380SLan Tianyu if (udev->parent) { 2487ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2488d5c3834eSDan Williams int port1 = udev->portnum; 2489d5c3834eSDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 2490fde26380SLan Tianyu 2491fde26380SLan Tianyu err = sysfs_create_link(&udev->dev.kobj, 2492fde26380SLan Tianyu &port_dev->dev.kobj, "port"); 2493fde26380SLan Tianyu if (err) 2494fde26380SLan Tianyu goto fail; 2495fde26380SLan Tianyu 2496fde26380SLan Tianyu err = sysfs_create_link(&port_dev->dev.kobj, 2497fde26380SLan Tianyu &udev->dev.kobj, "device"); 2498fde26380SLan Tianyu if (err) { 2499fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2500fde26380SLan Tianyu goto fail; 2501fde26380SLan Tianyu } 2502971fcd49SLan Tianyu 2503d5c3834eSDan Williams if (!test_and_set_bit(port1, hub->child_usage_bits)) 2504971fcd49SLan Tianyu pm_runtime_get_sync(&port_dev->dev); 2505fde26380SLan Tianyu } 2506fde26380SLan Tianyu 25073b23dd6fSAlan Stern (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); 2508c08512c7SAlan Stern usb_mark_last_busy(udev); 2509c08512c7SAlan Stern pm_runtime_put_sync_autosuspend(&udev->dev); 2510c066475eSGreg Kroah-Hartman return err; 25111da177e4SLinus Torvalds 25121da177e4SLinus Torvalds fail: 25131da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 25149bbdf1e0SAlan Stern pm_runtime_disable(&udev->dev); 25159bbdf1e0SAlan Stern pm_runtime_set_suspended(&udev->dev); 2516d9d16e8aSInaky Perez-Gonzalez return err; 25171da177e4SLinus Torvalds } 25181da177e4SLinus Torvalds 251993993a0aSInaky Perez-Gonzalez 252093993a0aSInaky Perez-Gonzalez /** 2521fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 2522fd39c86bSRandy Dunlap * @usb_dev: USB device 2523fd39c86bSRandy Dunlap * 2524fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 2525fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 252693993a0aSInaky Perez-Gonzalez * 252793993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 252893993a0aSInaky Perez-Gonzalez * defer its call. 2529626f090cSYacine Belkadi * 2530626f090cSYacine Belkadi * Return: 0. 253193993a0aSInaky Perez-Gonzalez */ 253293993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 253393993a0aSInaky Perez-Gonzalez { 253493993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 253593993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 253693993a0aSInaky Perez-Gonzalez goto out_unauthorized; 2537da307123SAlan Stern 253893993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 253993993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 2540da307123SAlan Stern 254193993a0aSInaky Perez-Gonzalez out_unauthorized: 254293993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 254393993a0aSInaky Perez-Gonzalez return 0; 254493993a0aSInaky Perez-Gonzalez } 254593993a0aSInaky Perez-Gonzalez 254693993a0aSInaky Perez-Gonzalez 254793993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 254893993a0aSInaky Perez-Gonzalez { 254993993a0aSInaky Perez-Gonzalez int result = 0, c; 2550da307123SAlan Stern 255193993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 255293993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 255393993a0aSInaky Perez-Gonzalez goto out_authorized; 2554da307123SAlan Stern 255593993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 255693993a0aSInaky Perez-Gonzalez if (result < 0) { 255793993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 255893993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 255993993a0aSInaky Perez-Gonzalez goto error_autoresume; 256093993a0aSInaky Perez-Gonzalez } 2561e50a322eSJosef Gajdusek 2562e50a322eSJosef Gajdusek if (usb_dev->wusb) { 256393993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 256493993a0aSInaky Perez-Gonzalez if (result < 0) { 256593993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 256693993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 256793993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 256893993a0aSInaky Perez-Gonzalez } 2569e50a322eSJosef Gajdusek } 2570da307123SAlan Stern 257193993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 257293993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 257393993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 257493993a0aSInaky Perez-Gonzalez */ 2575b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 257693993a0aSInaky Perez-Gonzalez if (c >= 0) { 257793993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 257893993a0aSInaky Perez-Gonzalez if (result) { 257993993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 258093993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 258193993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 258293993a0aSInaky Perez-Gonzalez * set other configurations. */ 258393993a0aSInaky Perez-Gonzalez } 258493993a0aSInaky Perez-Gonzalez } 258593993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 2586da307123SAlan Stern 258793993a0aSInaky Perez-Gonzalez error_device_descriptor: 2588da307123SAlan Stern usb_autosuspend_device(usb_dev); 258993993a0aSInaky Perez-Gonzalez error_autoresume: 259093993a0aSInaky Perez-Gonzalez out_authorized: 2591781b2137SMatthias Beyer usb_unlock_device(usb_dev); /* complements locktree */ 259293993a0aSInaky Perez-Gonzalez return result; 259393993a0aSInaky Perez-Gonzalez } 259493993a0aSInaky Perez-Gonzalez 259593993a0aSInaky Perez-Gonzalez 25960165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 25970165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 25980165de09SInaky Perez-Gonzalez { 25990165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 26000165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 26010165de09SInaky Perez-Gonzalez return 0; 26020165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 26030165de09SInaky Perez-Gonzalez return hcd->wireless; 26040165de09SInaky Perez-Gonzalez } 26050165de09SInaky Perez-Gonzalez 26060165de09SInaky Perez-Gonzalez 26071da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 26081da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 26091da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 26101da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 261190ab5ee9SRusty Russell #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first) 26121da177e4SLinus Torvalds 26131da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 26141da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 261575d7cf72SAndiry Xu #define HUB_BH_RESET_TIME 50 26161da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 261777c7f072SSarah Sharp #define HUB_RESET_TIMEOUT 800 26181da177e4SLinus Torvalds 261948fc7dbdSDan Williams /* 262048fc7dbdSDan Williams * "New scheme" enumeration causes an extra state transition to be 262148fc7dbdSDan Williams * exposed to an xhci host and causes USB3 devices to receive control 262248fc7dbdSDan Williams * commands in the default state. This has been seen to cause 262348fc7dbdSDan Williams * enumeration failures, so disable this enumeration scheme for USB3 262448fc7dbdSDan Williams * devices. 262548fc7dbdSDan Williams */ 262648fc7dbdSDan Williams static bool use_new_scheme(struct usb_device *udev, int retry) 262748fc7dbdSDan Williams { 262848fc7dbdSDan Williams if (udev->speed == USB_SPEED_SUPER) 262948fc7dbdSDan Williams return false; 263048fc7dbdSDan Williams 263148fc7dbdSDan Williams return USE_NEW_SCHEME(retry); 263248fc7dbdSDan Williams } 263348fc7dbdSDan Williams 2634025d4430SRahul Bedarkar /* Is a USB 3.0 port in the Inactive or Compliance Mode state? 26358bea2bd3SStanislaw Ledwon * Port worm reset is required to recover 26368bea2bd3SStanislaw Ledwon */ 26373cd12f91SDan Williams static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1, 26383cd12f91SDan Williams u16 portstatus) 263910d674a8SSarah Sharp { 26403cd12f91SDan Williams u16 link_state; 26413cd12f91SDan Williams 26423cd12f91SDan Williams if (!hub_is_superspeed(hub->hdev)) 26433cd12f91SDan Williams return false; 26443cd12f91SDan Williams 26453cd12f91SDan Williams if (test_bit(port1, hub->warm_reset_bits)) 26463cd12f91SDan Williams return true; 26473cd12f91SDan Williams 26483cd12f91SDan Williams link_state = portstatus & USB_PORT_STAT_LINK_STATE; 26493cd12f91SDan Williams return link_state == USB_SS_PORT_LS_SS_INACTIVE 26503cd12f91SDan Williams || link_state == USB_SS_PORT_LS_COMP_MOD; 265110d674a8SSarah Sharp } 265210d674a8SSarah Sharp 26531da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 265475d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 26551da177e4SLinus Torvalds { 26561da177e4SLinus Torvalds int delay_time, ret; 26571da177e4SLinus Torvalds u16 portstatus; 26581da177e4SLinus Torvalds u16 portchange; 26591da177e4SLinus Torvalds 26601da177e4SLinus Torvalds for (delay_time = 0; 26611da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 26621da177e4SLinus Torvalds delay_time += delay) { 26631da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 26641da177e4SLinus Torvalds msleep(delay); 26651da177e4SLinus Torvalds 26661da177e4SLinus Torvalds /* read and decode port status */ 26671da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 26681da177e4SLinus Torvalds if (ret < 0) 26691da177e4SLinus Torvalds return ret; 26701da177e4SLinus Torvalds 26714f43447eSSarah Sharp /* The port state is unknown until the reset completes. */ 2672470f0be8SSarah Sharp if (!(portstatus & USB_PORT_STAT_RESET)) 2673470f0be8SSarah Sharp break; 2674470f0be8SSarah Sharp 2675470f0be8SSarah Sharp /* switch to the long delay after two short delay failures */ 2676470f0be8SSarah Sharp if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 2677470f0be8SSarah Sharp delay = HUB_LONG_RESET_TIME; 2678470f0be8SSarah Sharp 2679d99f6b41SDan Williams dev_dbg(&hub->ports[port1 - 1]->dev, 2680d99f6b41SDan Williams "not %sreset yet, waiting %dms\n", 2681d99f6b41SDan Williams warm ? "warm " : "", delay); 2682470f0be8SSarah Sharp } 2683470f0be8SSarah Sharp 26844f43447eSSarah Sharp if ((portstatus & USB_PORT_STAT_RESET)) 2685470f0be8SSarah Sharp return -EBUSY; 26864f43447eSSarah Sharp 26873cd12f91SDan Williams if (hub_port_warm_reset_required(hub, port1, portstatus)) 2688a24a6078SSarah Sharp return -ENOTCONN; 268910d674a8SSarah Sharp 26901da177e4SLinus Torvalds /* Device went away? */ 26911da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 26921da177e4SLinus Torvalds return -ENOTCONN; 26931da177e4SLinus Torvalds 2694a24a6078SSarah Sharp /* bomb out completely if the connection bounced. A USB 3.0 2695a24a6078SSarah Sharp * connection may bounce if multiple warm resets were issued, 2696a24a6078SSarah Sharp * but the device may have successfully re-connected. Ignore it. 2697a24a6078SSarah Sharp */ 2698a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev) && 2699a24a6078SSarah Sharp (portchange & USB_PORT_STAT_C_CONNECTION)) 2700dd4dd19eSAlan Stern return -ENOTCONN; 27011da177e4SLinus Torvalds 2702470f0be8SSarah Sharp if (!(portstatus & USB_PORT_STAT_ENABLE)) 2703470f0be8SSarah Sharp return -EBUSY; 2704470f0be8SSarah Sharp 27052d4fa940SSarah Sharp if (!udev) 27062d4fa940SSarah Sharp return 0; 27072d4fa940SSarah Sharp 27080165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 2709551cdbbeSGreg Kroah-Hartman udev->speed = USB_SPEED_WIRELESS; 2710131dec34SSarah Sharp else if (hub_is_superspeed(hub->hdev)) 2711809cd1cbSSarah Sharp udev->speed = USB_SPEED_SUPER; 27120165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 27131da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 27141da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 27151da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 27161da177e4SLinus Torvalds else 27171da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 27181da177e4SLinus Torvalds return 0; 27191da177e4SLinus Torvalds } 27201da177e4SLinus Torvalds 272175d7cf72SAndiry Xu /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ 272275d7cf72SAndiry Xu static int hub_port_reset(struct usb_hub *hub, int port1, 272375d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 272475d7cf72SAndiry Xu { 272575d7cf72SAndiry Xu int i, status; 2726a24a6078SSarah Sharp u16 portchange, portstatus; 2727d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 272875d7cf72SAndiry Xu 272975d7cf72SAndiry Xu if (!hub_is_superspeed(hub->hdev)) { 27300fe51aa5SSarah Sharp if (warm) { 273175d7cf72SAndiry Xu dev_err(hub->intfdev, "only USB3 hub support " 273275d7cf72SAndiry Xu "warm reset\n"); 273375d7cf72SAndiry Xu return -EINVAL; 273475d7cf72SAndiry Xu } 27350fe51aa5SSarah Sharp /* Block EHCI CF initialization during the port reset. 27360fe51aa5SSarah Sharp * Some companion controllers don't like it when they mix. 27370fe51aa5SSarah Sharp */ 27380fe51aa5SSarah Sharp down_read(&ehci_cf_port_reset_rwsem); 2739d3b9d7a9SSarah Sharp } else if (!warm) { 2740d3b9d7a9SSarah Sharp /* 2741d3b9d7a9SSarah Sharp * If the caller hasn't explicitly requested a warm reset, 2742d3b9d7a9SSarah Sharp * double check and see if one is needed. 2743d3b9d7a9SSarah Sharp */ 2744fb6d1f7dSRobert Schlabbach if (hub_port_status(hub, port1, &portstatus, &portchange) == 0) 2745fb6d1f7dSRobert Schlabbach if (hub_port_warm_reset_required(hub, port1, 2746fb6d1f7dSRobert Schlabbach portstatus)) 2747d3b9d7a9SSarah Sharp warm = true; 274875d7cf72SAndiry Xu } 27493cd12f91SDan Williams clear_bit(port1, hub->warm_reset_bits); 275075d7cf72SAndiry Xu 275175d7cf72SAndiry Xu /* Reset the port */ 275275d7cf72SAndiry Xu for (i = 0; i < PORT_RESET_TRIES; i++) { 275375d7cf72SAndiry Xu status = set_port_feature(hub->hdev, port1, (warm ? 275475d7cf72SAndiry Xu USB_PORT_FEAT_BH_PORT_RESET : 275575d7cf72SAndiry Xu USB_PORT_FEAT_RESET)); 2756e9e88fb7SAlan Stern if (status == -ENODEV) { 2757e9e88fb7SAlan Stern ; /* The hub is gone */ 2758e9e88fb7SAlan Stern } else if (status) { 2759d99f6b41SDan Williams dev_err(&port_dev->dev, 2760d99f6b41SDan Williams "cannot %sreset (err = %d)\n", 2761d99f6b41SDan Williams warm ? "warm " : "", status); 276275d7cf72SAndiry Xu } else { 276375d7cf72SAndiry Xu status = hub_port_wait_reset(hub, port1, udev, delay, 276475d7cf72SAndiry Xu warm); 2765e9e88fb7SAlan Stern if (status && status != -ENOTCONN && status != -ENODEV) 276675d7cf72SAndiry Xu dev_dbg(hub->intfdev, 276775d7cf72SAndiry Xu "port_wait_reset: err = %d\n", 276875d7cf72SAndiry Xu status); 276975d7cf72SAndiry Xu } 277075d7cf72SAndiry Xu 2771a24a6078SSarah Sharp /* Check for disconnect or reset */ 277275d7cf72SAndiry Xu if (status == 0 || status == -ENOTCONN || status == -ENODEV) { 2773fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2774fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_RESET); 2775a24a6078SSarah Sharp 2776a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 277732fe0198SAlan Stern goto done; 2778a24a6078SSarah Sharp 2779fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2780fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_BH_PORT_RESET); 2781fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2782fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_PORT_LINK_STATE); 2783fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2784fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_CONNECTION); 2785fb6d1f7dSRobert Schlabbach 2786a24a6078SSarah Sharp /* 2787a24a6078SSarah Sharp * If a USB 3.0 device migrates from reset to an error 2788a24a6078SSarah Sharp * state, re-issue the warm reset. 2789a24a6078SSarah Sharp */ 2790a24a6078SSarah Sharp if (hub_port_status(hub, port1, 2791a24a6078SSarah Sharp &portstatus, &portchange) < 0) 2792a24a6078SSarah Sharp goto done; 2793a24a6078SSarah Sharp 27943cd12f91SDan Williams if (!hub_port_warm_reset_required(hub, port1, 27953cd12f91SDan Williams portstatus)) 2796a24a6078SSarah Sharp goto done; 2797a24a6078SSarah Sharp 2798a24a6078SSarah Sharp /* 2799a24a6078SSarah Sharp * If the port is in SS.Inactive or Compliance Mode, the 2800a24a6078SSarah Sharp * hot or warm reset failed. Try another warm reset. 2801a24a6078SSarah Sharp */ 2802a24a6078SSarah Sharp if (!warm) { 2803d99f6b41SDan Williams dev_dbg(&port_dev->dev, 2804d99f6b41SDan Williams "hot reset failed, warm reset\n"); 2805a24a6078SSarah Sharp warm = true; 2806a24a6078SSarah Sharp } 28071da177e4SLinus Torvalds } 28081da177e4SLinus Torvalds 2809d99f6b41SDan Williams dev_dbg(&port_dev->dev, 2810d99f6b41SDan Williams "not enabled, trying %sreset again...\n", 2811d99f6b41SDan Williams warm ? "warm " : ""); 28121da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 28131da177e4SLinus Torvalds } 28141da177e4SLinus Torvalds 2815d99f6b41SDan Williams dev_err(&port_dev->dev, "Cannot enable. Maybe the USB cable is bad?\n"); 28161da177e4SLinus Torvalds 281732fe0198SAlan Stern done: 2818fb6d1f7dSRobert Schlabbach if (status == 0) { 2819fb6d1f7dSRobert Schlabbach /* TRSTRCY = 10 ms; plus some extra */ 2820fb6d1f7dSRobert Schlabbach msleep(10 + 40); 2821fb6d1f7dSRobert Schlabbach if (udev) { 2822fb6d1f7dSRobert Schlabbach struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2823fb6d1f7dSRobert Schlabbach 2824fb6d1f7dSRobert Schlabbach update_devnum(udev, 0); 2825fb6d1f7dSRobert Schlabbach /* The xHC may think the device is already reset, 2826fb6d1f7dSRobert Schlabbach * so ignore the status. 2827fb6d1f7dSRobert Schlabbach */ 2828fb6d1f7dSRobert Schlabbach if (hcd->driver->reset_device) 2829fb6d1f7dSRobert Schlabbach hcd->driver->reset_device(hcd, udev); 2830fb6d1f7dSRobert Schlabbach 2831fb6d1f7dSRobert Schlabbach usb_set_device_state(udev, USB_STATE_DEFAULT); 2832fb6d1f7dSRobert Schlabbach } 2833fb6d1f7dSRobert Schlabbach } else { 2834fb6d1f7dSRobert Schlabbach if (udev) 2835fb6d1f7dSRobert Schlabbach usb_set_device_state(udev, USB_STATE_NOTATTACHED); 2836fb6d1f7dSRobert Schlabbach } 2837fb6d1f7dSRobert Schlabbach 28380fe51aa5SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 283932fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 284075d7cf72SAndiry Xu 28411da177e4SLinus Torvalds return status; 28421da177e4SLinus Torvalds } 28431da177e4SLinus Torvalds 28440ed9a57eSAndiry Xu /* Check if a port is power on */ 28450ed9a57eSAndiry Xu static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) 28460ed9a57eSAndiry Xu { 28470ed9a57eSAndiry Xu int ret = 0; 28480ed9a57eSAndiry Xu 28490ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 28500ed9a57eSAndiry Xu if (portstatus & USB_SS_PORT_STAT_POWER) 28510ed9a57eSAndiry Xu ret = 1; 28520ed9a57eSAndiry Xu } else { 28530ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_POWER) 28540ed9a57eSAndiry Xu ret = 1; 28550ed9a57eSAndiry Xu } 28560ed9a57eSAndiry Xu 28570ed9a57eSAndiry Xu return ret; 28580ed9a57eSAndiry Xu } 28590ed9a57eSAndiry Xu 28605c79a1e3SDan Williams static void usb_lock_port(struct usb_port *port_dev) 28615c79a1e3SDan Williams __acquires(&port_dev->status_lock) 28625c79a1e3SDan Williams { 28635c79a1e3SDan Williams mutex_lock(&port_dev->status_lock); 28645c79a1e3SDan Williams __acquire(&port_dev->status_lock); 28655c79a1e3SDan Williams } 28665c79a1e3SDan Williams 28675c79a1e3SDan Williams static void usb_unlock_port(struct usb_port *port_dev) 28685c79a1e3SDan Williams __releases(&port_dev->status_lock) 28695c79a1e3SDan Williams { 28705c79a1e3SDan Williams mutex_unlock(&port_dev->status_lock); 28715c79a1e3SDan Williams __release(&port_dev->status_lock); 28725c79a1e3SDan Williams } 28735c79a1e3SDan Williams 2874d388dab7SAlan Stern #ifdef CONFIG_PM 28751da177e4SLinus Torvalds 28760ed9a57eSAndiry Xu /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ 28770ed9a57eSAndiry Xu static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) 28780ed9a57eSAndiry Xu { 28790ed9a57eSAndiry Xu int ret = 0; 28800ed9a57eSAndiry Xu 28810ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 28820ed9a57eSAndiry Xu if ((portstatus & USB_PORT_STAT_LINK_STATE) 28830ed9a57eSAndiry Xu == USB_SS_PORT_LS_U3) 28840ed9a57eSAndiry Xu ret = 1; 28850ed9a57eSAndiry Xu } else { 28860ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_SUSPEND) 28870ed9a57eSAndiry Xu ret = 1; 28880ed9a57eSAndiry Xu } 28890ed9a57eSAndiry Xu 28900ed9a57eSAndiry Xu return ret; 28910ed9a57eSAndiry Xu } 2892b01b03f3SAlan Stern 2893b01b03f3SAlan Stern /* Determine whether the device on a port is ready for a normal resume, 2894b01b03f3SAlan Stern * is ready for a reset-resume, or should be disconnected. 2895b01b03f3SAlan Stern */ 2896b01b03f3SAlan Stern static int check_port_resume_type(struct usb_device *udev, 2897b01b03f3SAlan Stern struct usb_hub *hub, int port1, 28987fa40910SJulius Werner int status, u16 portchange, u16 portstatus) 2899b01b03f3SAlan Stern { 2900d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 29017fa40910SJulius Werner int retries = 3; 2902d99f6b41SDan Williams 29037fa40910SJulius Werner retry: 29043cd12f91SDan Williams /* Is a warm reset needed to recover the connection? */ 29053cd12f91SDan Williams if (status == 0 && udev->reset_resume 29063cd12f91SDan Williams && hub_port_warm_reset_required(hub, port1, portstatus)) { 29073cd12f91SDan Williams /* pass */; 29083cd12f91SDan Williams } 2909b01b03f3SAlan Stern /* Is the device still present? */ 29103cd12f91SDan Williams else if (status || port_is_suspended(hub, portstatus) || 29117fa40910SJulius Werner !port_is_power_on(hub, portstatus)) { 2912b01b03f3SAlan Stern if (status >= 0) 2913b01b03f3SAlan Stern status = -ENODEV; 29147fa40910SJulius Werner } else if (!(portstatus & USB_PORT_STAT_CONNECTION)) { 29157fa40910SJulius Werner if (retries--) { 29167fa40910SJulius Werner usleep_range(200, 300); 29177fa40910SJulius Werner status = hub_port_status(hub, port1, &portstatus, 29187fa40910SJulius Werner &portchange); 29197fa40910SJulius Werner goto retry; 29207fa40910SJulius Werner } 29217fa40910SJulius Werner status = -ENODEV; 2922b01b03f3SAlan Stern } 2923b01b03f3SAlan Stern 292486c57edfSAlan Stern /* Can't do a normal resume if the port isn't enabled, 292586c57edfSAlan Stern * so try a reset-resume instead. 292686c57edfSAlan Stern */ 292786c57edfSAlan Stern else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { 292886c57edfSAlan Stern if (udev->persist_enabled) 292986c57edfSAlan Stern udev->reset_resume = 1; 293086c57edfSAlan Stern else 2931b01b03f3SAlan Stern status = -ENODEV; 293286c57edfSAlan Stern } 2933b01b03f3SAlan Stern 2934b01b03f3SAlan Stern if (status) { 2935d99f6b41SDan Williams dev_dbg(&port_dev->dev, "status %04x.%04x after resume, %d\n", 2936d99f6b41SDan Williams portchange, portstatus, status); 2937b01b03f3SAlan Stern } else if (udev->reset_resume) { 2938b01b03f3SAlan Stern 2939b01b03f3SAlan Stern /* Late port handoff can set status-change bits */ 2940b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) 2941ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2942b01b03f3SAlan Stern USB_PORT_FEAT_C_CONNECTION); 2943b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) 2944ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2945b01b03f3SAlan Stern USB_PORT_FEAT_C_ENABLE); 2946b01b03f3SAlan Stern } 2947b01b03f3SAlan Stern 2948b01b03f3SAlan Stern return status; 2949b01b03f3SAlan Stern } 2950b01b03f3SAlan Stern 2951f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 2952f74631e3SSarah Sharp { 2953f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2954f74631e3SSarah Sharp 2955f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 2956f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 2957f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 2958f74631e3SSarah Sharp return 0; 2959f74631e3SSarah Sharp 2960f74631e3SSarah Sharp /* Clear Feature LTM Enable can only be sent if the device is 2961f74631e3SSarah Sharp * configured. 2962f74631e3SSarah Sharp */ 2963f74631e3SSarah Sharp if (!udev->actconfig) 2964f74631e3SSarah Sharp return 0; 2965f74631e3SSarah Sharp 2966f74631e3SSarah Sharp return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2967f74631e3SSarah Sharp USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 2968f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 2969f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 2970f74631e3SSarah Sharp } 2971f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 2972f74631e3SSarah Sharp 2973f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) 2974f74631e3SSarah Sharp { 2975f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2976f74631e3SSarah Sharp 2977f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 2978f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 2979f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 2980f74631e3SSarah Sharp return; 2981f74631e3SSarah Sharp 2982f74631e3SSarah Sharp /* Set Feature LTM Enable can only be sent if the device is 2983f74631e3SSarah Sharp * configured. 2984f74631e3SSarah Sharp */ 2985f74631e3SSarah Sharp if (!udev->actconfig) 2986f74631e3SSarah Sharp return; 2987f74631e3SSarah Sharp 2988f74631e3SSarah Sharp usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2989f74631e3SSarah Sharp USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 2990f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 2991f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 2992f74631e3SSarah Sharp } 2993f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 2994f74631e3SSarah Sharp 299554a3ac0cSLan Tianyu /* 299628e86165SAlan Stern * usb_enable_remote_wakeup - enable remote wakeup for a device 299754a3ac0cSLan Tianyu * @udev: target device 299854a3ac0cSLan Tianyu * 299928e86165SAlan Stern * For USB-2 devices: Set the device's remote wakeup feature. 300028e86165SAlan Stern * 300128e86165SAlan Stern * For USB-3 devices: Assume there's only one function on the device and 300228e86165SAlan Stern * enable remote wake for the first interface. FIXME if the interface 300328e86165SAlan Stern * association descriptor shows there's more than one function. 300454a3ac0cSLan Tianyu */ 300528e86165SAlan Stern static int usb_enable_remote_wakeup(struct usb_device *udev) 300654a3ac0cSLan Tianyu { 300728e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) 300828e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 300928e86165SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 301028e86165SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, 301128e86165SAlan Stern USB_CTRL_SET_TIMEOUT); 301228e86165SAlan Stern else 301328e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 301428e86165SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, 301528e86165SAlan Stern USB_INTRF_FUNC_SUSPEND, 301628e86165SAlan Stern USB_INTRF_FUNC_SUSPEND_RW | 301728e86165SAlan Stern USB_INTRF_FUNC_SUSPEND_LP, 301828e86165SAlan Stern NULL, 0, USB_CTRL_SET_TIMEOUT); 301928e86165SAlan Stern } 302028e86165SAlan Stern 302128e86165SAlan Stern /* 302228e86165SAlan Stern * usb_disable_remote_wakeup - disable remote wakeup for a device 302328e86165SAlan Stern * @udev: target device 302428e86165SAlan Stern * 302528e86165SAlan Stern * For USB-2 devices: Clear the device's remote wakeup feature. 302628e86165SAlan Stern * 302728e86165SAlan Stern * For USB-3 devices: Assume there's only one function on the device and 302828e86165SAlan Stern * disable remote wake for the first interface. FIXME if the interface 302928e86165SAlan Stern * association descriptor shows there's more than one function. 303028e86165SAlan Stern */ 303128e86165SAlan Stern static int usb_disable_remote_wakeup(struct usb_device *udev) 303228e86165SAlan Stern { 303328e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) 303428e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 303528e86165SAlan Stern USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 303628e86165SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, 303728e86165SAlan Stern USB_CTRL_SET_TIMEOUT); 303828e86165SAlan Stern else 303954a3ac0cSLan Tianyu return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 304054a3ac0cSLan Tianyu USB_REQ_CLEAR_FEATURE, USB_RECIP_INTERFACE, 304154a3ac0cSLan Tianyu USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, 304254a3ac0cSLan Tianyu USB_CTRL_SET_TIMEOUT); 304354a3ac0cSLan Tianyu } 30441da177e4SLinus Torvalds 3045e583d9dbSAlan Stern /* Count of wakeup-enabled devices at or below udev */ 3046e583d9dbSAlan Stern static unsigned wakeup_enabled_descendants(struct usb_device *udev) 3047e583d9dbSAlan Stern { 3048e583d9dbSAlan Stern struct usb_hub *hub = usb_hub_to_struct_hub(udev); 3049e583d9dbSAlan Stern 3050e583d9dbSAlan Stern return udev->do_remote_wakeup + 3051e583d9dbSAlan Stern (hub ? hub->wakeup_enabled_descendants : 0); 3052e583d9dbSAlan Stern } 3053e583d9dbSAlan Stern 30541da177e4SLinus Torvalds /* 3055140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 3056624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 30575edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 30581da177e4SLinus Torvalds * 30591da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 30601da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 30611da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 3062140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 30631da177e4SLinus Torvalds * to disconnect devices while they are suspended. 30641da177e4SLinus Torvalds * 3065390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 3066390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 3067390a8c34SDavid Brownell * 3068624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 3069624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 3070624d6c07SAlan Stern * All devices below the suspended port are also suspended. 3071624d6c07SAlan Stern * 3072624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 3073624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 3074624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 3075624d6c07SAlan Stern * some cases, this wakes the USB host. 3076624d6c07SAlan Stern * 30771da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 30781da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 30791da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 30801da177e4SLinus Torvalds * 30814956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 30824956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 30834956eccdSAlan Stern * State transitions include: 30844956eccdSAlan Stern * 30854956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 30864956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 30874956eccdSAlan Stern * 30884956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 30894956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 30904956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 309137ebb549SPetr Mladek * Linux (2.6) currently has NO mechanisms to initiate that: no hub_wq 30924956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 30934956eccdSAlan Stern * 3094e583d9dbSAlan Stern * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get 3095e583d9dbSAlan Stern * suspended until their bus goes into global suspend (i.e., the root 30960aa2832dSAlan Stern * hub is suspended). Nevertheless, we change @udev->state to 30970aa2832dSAlan Stern * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual 30980aa2832dSAlan Stern * upstream port setting is stored in @udev->port_is_suspended. 30994956eccdSAlan Stern * 31001da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 31011da177e4SLinus Torvalds */ 310265bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 31031da177e4SLinus Torvalds { 3104ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 3105ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 3106624d6c07SAlan Stern int port1 = udev->portnum; 3107624d6c07SAlan Stern int status; 31080aa2832dSAlan Stern bool really_suspend = true; 31094956eccdSAlan Stern 31105c79a1e3SDan Williams usb_lock_port(port_dev); 31115c79a1e3SDan Williams 3112624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 3113624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 3114624d6c07SAlan Stern * 3115624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 3116624d6c07SAlan Stern * we don't explicitly enable it here. 3117624d6c07SAlan Stern */ 3118624d6c07SAlan Stern if (udev->do_remote_wakeup) { 311928e86165SAlan Stern status = usb_enable_remote_wakeup(udev); 31200c487206SOliver Neukum if (status) { 3121624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 3122624d6c07SAlan Stern status); 31230c487206SOliver Neukum /* bail if autosuspend is requested */ 31245b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 31254fae6f0fSAlan Stern goto err_wakeup; 31260c487206SOliver Neukum } 3127624d6c07SAlan Stern } 3128624d6c07SAlan Stern 312965580b43SAndiry Xu /* disable USB2 hardware LPM */ 313065580b43SAndiry Xu if (udev->usb2_hw_lpm_enabled == 1) 313165580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 0); 313265580b43SAndiry Xu 3133f74631e3SSarah Sharp if (usb_disable_ltm(udev)) { 31344fae6f0fSAlan Stern dev_err(&udev->dev, "Failed to disable LTM before suspend\n."); 31354fae6f0fSAlan Stern status = -ENOMEM; 31364fae6f0fSAlan Stern if (PMSG_IS_AUTO(msg)) 31374fae6f0fSAlan Stern goto err_ltm; 3138f74631e3SSarah Sharp } 31398306095fSSarah Sharp if (usb_unlocked_disable_lpm(udev)) { 31404fae6f0fSAlan Stern dev_err(&udev->dev, "Failed to disable LPM before suspend\n."); 31414fae6f0fSAlan Stern status = -ENOMEM; 31424fae6f0fSAlan Stern if (PMSG_IS_AUTO(msg)) 31434fae6f0fSAlan Stern goto err_lpm3; 31448306095fSSarah Sharp } 31458306095fSSarah Sharp 3146624d6c07SAlan Stern /* see 7.1.7.6 */ 3147a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3148c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); 3149e583d9dbSAlan Stern 31500aa2832dSAlan Stern /* 31510aa2832dSAlan Stern * For system suspend, we do not need to enable the suspend feature 31520aa2832dSAlan Stern * on individual USB-2 ports. The devices will automatically go 31530aa2832dSAlan Stern * into suspend a few ms after the root hub stops sending packets. 31540aa2832dSAlan Stern * The USB 2.0 spec calls this "global suspend". 3155e583d9dbSAlan Stern * 3156e583d9dbSAlan Stern * However, many USB hubs have a bug: They don't relay wakeup requests 3157e583d9dbSAlan Stern * from a downstream port if the port's suspend feature isn't on. 3158e583d9dbSAlan Stern * Therefore we will turn on the suspend feature if udev or any of its 3159e583d9dbSAlan Stern * descendants is enabled for remote wakeup. 31600aa2832dSAlan Stern */ 3161e583d9dbSAlan Stern else if (PMSG_IS_AUTO(msg) || wakeup_enabled_descendants(udev) > 0) 3162e583d9dbSAlan Stern status = set_port_feature(hub->hdev, port1, 3163e583d9dbSAlan Stern USB_PORT_FEAT_SUSPEND); 31640aa2832dSAlan Stern else { 31650aa2832dSAlan Stern really_suspend = false; 31660aa2832dSAlan Stern status = 0; 31670aa2832dSAlan Stern } 3168624d6c07SAlan Stern if (status) { 3169d99f6b41SDan Williams dev_dbg(&port_dev->dev, "can't suspend, status %d\n", status); 3170cbb33004SAlan Stern 31714fae6f0fSAlan Stern /* Try to enable USB3 LPM and LTM again */ 31724fae6f0fSAlan Stern usb_unlocked_enable_lpm(udev); 31734fae6f0fSAlan Stern err_lpm3: 31744fae6f0fSAlan Stern usb_enable_ltm(udev); 31754fae6f0fSAlan Stern err_ltm: 3176c3e751e4SAndiry Xu /* Try to enable USB2 hardware LPM again */ 3177c3e751e4SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 3178c3e751e4SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 3179c3e751e4SAndiry Xu 31804fae6f0fSAlan Stern if (udev->do_remote_wakeup) 31814fae6f0fSAlan Stern (void) usb_disable_remote_wakeup(udev); 31824fae6f0fSAlan Stern err_wakeup: 31838306095fSSarah Sharp 3184cbb33004SAlan Stern /* System sleep transitions should never fail */ 31855b1b0b81SAlan Stern if (!PMSG_IS_AUTO(msg)) 3186cbb33004SAlan Stern status = 0; 3187624d6c07SAlan Stern } else { 318830b1a7a3SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", 318930b1a7a3SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : ""), 319030b1a7a3SAlan Stern udev->do_remote_wakeup); 31910aa2832dSAlan Stern if (really_suspend) { 3192bfd1e910SAlan Stern udev->port_is_suspended = 1; 3193e583d9dbSAlan Stern 3194e583d9dbSAlan Stern /* device has up to 10 msec to fully suspend */ 3195624d6c07SAlan Stern msleep(10); 3196624d6c07SAlan Stern } 3197e583d9dbSAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 31980aa2832dSAlan Stern } 3199ad493e5eSLan Tianyu 3200d5c3834eSDan Williams if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled 3201d5c3834eSDan Williams && test_and_clear_bit(port1, hub->child_usage_bits)) 3202ad493e5eSLan Tianyu pm_runtime_put_sync(&port_dev->dev); 3203ad493e5eSLan Tianyu 3204c08512c7SAlan Stern usb_mark_last_busy(hub->hdev); 32055c79a1e3SDan Williams 32065c79a1e3SDan Williams usb_unlock_port(port_dev); 32074956eccdSAlan Stern return status; 32081da177e4SLinus Torvalds } 3209f3f3253dSDavid Brownell 32101da177e4SLinus Torvalds /* 3211390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 3212390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 321354515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 32141da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 32151da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 32161da177e4SLinus Torvalds * in the tree that's rooted at this device. 321754515fe5SAlan Stern * 321854515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 321954515fe5SAlan Stern * status check is done. 32201da177e4SLinus Torvalds */ 3221140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 32221da177e4SLinus Torvalds { 322354515fe5SAlan Stern int status = 0; 322407e72b95SOliver Neukum u16 devstatus = 0; 32251da177e4SLinus Torvalds 32261da177e4SLinus Torvalds /* caller owns the udev device lock */ 3227b9cef6c3SWu Fengguang dev_dbg(&udev->dev, "%s\n", 3228b9cef6c3SWu Fengguang udev->reset_resume ? "finish reset-resume" : "finish resume"); 32291da177e4SLinus Torvalds 32301da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 32311da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 32321da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 323337ebb549SPetr Mladek * during many timeouts, but hub_wq can't suspend until later. 32341da177e4SLinus Torvalds */ 32351da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 32361da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 32371da177e4SLinus Torvalds : USB_STATE_ADDRESS); 32381da177e4SLinus Torvalds 323954515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 324054515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 324154515fe5SAlan Stern * operation is carried out here, after the port has been 324254515fe5SAlan Stern * resumed. 324354515fe5SAlan Stern */ 32441d10255cSAlan Stern if (udev->reset_resume) { 32451d10255cSAlan Stern /* 32461d10255cSAlan Stern * If the device morphs or switches modes when it is reset, 32471d10255cSAlan Stern * we don't want to perform a reset-resume. We'll fail the 32481d10255cSAlan Stern * resume, which will cause a logical disconnect, and then 32491d10255cSAlan Stern * the device will be rediscovered. 32501d10255cSAlan Stern */ 325186c57edfSAlan Stern retry_reset_resume: 32521d10255cSAlan Stern if (udev->quirks & USB_QUIRK_RESET) 32531d10255cSAlan Stern status = -ENODEV; 32541d10255cSAlan Stern else 3255742120c6SMing Lei status = usb_reset_and_verify_device(udev); 32561d10255cSAlan Stern } 325754515fe5SAlan Stern 32581da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 32591da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 32601da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 32611da177e4SLinus Torvalds */ 326254515fe5SAlan Stern if (status == 0) { 326346dede46SAlan Stern devstatus = 0; 32641da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 326586c57edfSAlan Stern 326686c57edfSAlan Stern /* If a normal resume failed, try doing a reset-resume */ 326786c57edfSAlan Stern if (status && !udev->reset_resume && udev->persist_enabled) { 326886c57edfSAlan Stern dev_dbg(&udev->dev, "retry with reset-resume\n"); 326986c57edfSAlan Stern udev->reset_resume = 1; 327086c57edfSAlan Stern goto retry_reset_resume; 327186c57edfSAlan Stern } 327254515fe5SAlan Stern } 3273b40b7a90SAlan Stern 3274624d6c07SAlan Stern if (status) { 3275624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 32761da177e4SLinus Torvalds status); 327707e72b95SOliver Neukum /* 327807e72b95SOliver Neukum * There are a few quirky devices which violate the standard 327907e72b95SOliver Neukum * by claiming to have remote wakeup enabled after a reset, 328007e72b95SOliver Neukum * which crash if the feature is cleared, hence check for 328107e72b95SOliver Neukum * udev->reset_resume 328207e72b95SOliver Neukum */ 328307e72b95SOliver Neukum } else if (udev->actconfig && !udev->reset_resume) { 328428e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) { 328554a3ac0cSLan Tianyu if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) 328628e86165SAlan Stern status = usb_disable_remote_wakeup(udev); 328754a3ac0cSLan Tianyu } else { 328854a3ac0cSLan Tianyu status = usb_get_status(udev, USB_RECIP_INTERFACE, 0, 328954a3ac0cSLan Tianyu &devstatus); 329054a3ac0cSLan Tianyu if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP 329154a3ac0cSLan Tianyu | USB_INTRF_STAT_FUNC_RW)) 329228e86165SAlan Stern status = usb_disable_remote_wakeup(udev); 329354a3ac0cSLan Tianyu } 329454a3ac0cSLan Tianyu 3295a8e7c565SAlan Stern if (status) 3296b9cef6c3SWu Fengguang dev_dbg(&udev->dev, 3297b9cef6c3SWu Fengguang "disable remote wakeup, status %d\n", 3298b9cef6c3SWu Fengguang status); 32991da177e4SLinus Torvalds status = 0; 33001da177e4SLinus Torvalds } 33011da177e4SLinus Torvalds return status; 33021da177e4SLinus Torvalds } 33031da177e4SLinus Torvalds 3304624d6c07SAlan Stern /* 3305a40178b2SPratyush Anand * There are some SS USB devices which take longer time for link training. 3306a40178b2SPratyush Anand * XHCI specs 4.19.4 says that when Link training is successful, port 3307a40178b2SPratyush Anand * sets CSC bit to 1. So if SW reads port status before successful link 3308a40178b2SPratyush Anand * training, then it will not find device to be present. 3309a40178b2SPratyush Anand * USB Analyzer log with such buggy devices show that in some cases 3310a40178b2SPratyush Anand * device switch on the RX termination after long delay of host enabling 3311a40178b2SPratyush Anand * the VBUS. In few other cases it has been seen that device fails to 3312a40178b2SPratyush Anand * negotiate link training in first attempt. It has been 3313a40178b2SPratyush Anand * reported till now that few devices take as long as 2000 ms to train 3314a40178b2SPratyush Anand * the link after host enabling its VBUS and termination. Following 3315a40178b2SPratyush Anand * routine implements a 2000 ms timeout for link training. If in a case 3316a40178b2SPratyush Anand * link trains before timeout, loop will exit earlier. 3317a40178b2SPratyush Anand * 3318a40178b2SPratyush Anand * FIXME: If a device was connected before suspend, but was removed 3319a40178b2SPratyush Anand * while system was asleep, then the loop in the following routine will 3320a40178b2SPratyush Anand * only exit at timeout. 3321a40178b2SPratyush Anand * 3322a40178b2SPratyush Anand * This routine should only be called when persist is enabled for a SS 3323a40178b2SPratyush Anand * device. 3324a40178b2SPratyush Anand */ 3325a40178b2SPratyush Anand static int wait_for_ss_port_enable(struct usb_device *udev, 3326a40178b2SPratyush Anand struct usb_hub *hub, int *port1, 3327a40178b2SPratyush Anand u16 *portchange, u16 *portstatus) 3328a40178b2SPratyush Anand { 3329a40178b2SPratyush Anand int status = 0, delay_ms = 0; 3330a40178b2SPratyush Anand 3331a40178b2SPratyush Anand while (delay_ms < 2000) { 3332a40178b2SPratyush Anand if (status || *portstatus & USB_PORT_STAT_CONNECTION) 3333a40178b2SPratyush Anand break; 3334a40178b2SPratyush Anand msleep(20); 3335a40178b2SPratyush Anand delay_ms += 20; 3336a40178b2SPratyush Anand status = hub_port_status(hub, *port1, portstatus, portchange); 3337a40178b2SPratyush Anand } 3338a40178b2SPratyush Anand return status; 3339a40178b2SPratyush Anand } 3340a40178b2SPratyush Anand 3341a40178b2SPratyush Anand /* 3342624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 3343624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 3344624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 3345624d6c07SAlan Stern * 3346624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 3347624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 3348624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 3349624d6c07SAlan Stern * the host and the device is the same as it was when the device 3350624d6c07SAlan Stern * suspended. 3351624d6c07SAlan Stern * 3352feccc30dSAlan Stern * If @udev->reset_resume is set then this routine won't check that the 3353feccc30dSAlan Stern * port is still enabled. Furthermore, finish_port_resume() above will 335454515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 335554515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 335654515fe5SAlan Stern * 335754515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 335854515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 335954515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 336054515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 336154515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 336254515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 336354515fe5SAlan Stern * made to appear as if it had not disconnected. 336454515fe5SAlan Stern * 3365742120c6SMing Lei * This facility can be dangerous. Although usb_reset_and_verify_device() makes 3366feccc30dSAlan Stern * every effort to insure that the same device is present after the 336754515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 336854515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 336954515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 337054515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 337154515fe5SAlan Stern * new card is corrupted and the system crashes. 337254515fe5SAlan Stern * 3373624d6c07SAlan Stern * Returns 0 on success, else negative errno. 3374624d6c07SAlan Stern */ 337565bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 33761da177e4SLinus Torvalds { 3377ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 3378ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 3379624d6c07SAlan Stern int port1 = udev->portnum; 33801da177e4SLinus Torvalds int status; 3381d25450c6SAlan Stern u16 portchange, portstatus; 3382d25450c6SAlan Stern 3383d5c3834eSDan Williams if (!test_and_set_bit(port1, hub->child_usage_bits)) { 3384ad493e5eSLan Tianyu status = pm_runtime_get_sync(&port_dev->dev); 3385ad493e5eSLan Tianyu if (status < 0) { 3386ad493e5eSLan Tianyu dev_dbg(&udev->dev, "can't resume usb port, status %d\n", 3387ad493e5eSLan Tianyu status); 3388ad493e5eSLan Tianyu return status; 3389ad493e5eSLan Tianyu } 3390ad493e5eSLan Tianyu } 3391ad493e5eSLan Tianyu 33925c79a1e3SDan Williams usb_lock_port(port_dev); 33935c79a1e3SDan Williams 3394d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 3395d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 33960ed9a57eSAndiry Xu if (status == 0 && !port_is_suspended(hub, portstatus)) 3397d25450c6SAlan Stern goto SuspendCleared; 33981da177e4SLinus Torvalds 33991da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 3400a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3401c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); 3402a7114230SAndiry Xu else 3403ad493e5eSLan Tianyu status = usb_clear_port_feature(hub->hdev, 34041da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 34051da177e4SLinus Torvalds if (status) { 3406d99f6b41SDan Williams dev_dbg(&port_dev->dev, "can't resume, status %d\n", status); 34071da177e4SLinus Torvalds } else { 3408bbc78c07SFelipe Balbi /* drive resume for USB_RESUME_TIMEOUT msec */ 3409645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 34105b1b0b81SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : "")); 3411bbc78c07SFelipe Balbi msleep(USB_RESUME_TIMEOUT); 34121da177e4SLinus Torvalds 34131da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 34141da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 34151da177e4SLinus Torvalds * sequence. 34161da177e4SLinus Torvalds */ 3417d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 341854515fe5SAlan Stern 34191da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 34201da177e4SLinus Torvalds msleep(10); 34211da177e4SLinus Torvalds } 3422b01b03f3SAlan Stern 3423b01b03f3SAlan Stern SuspendCleared: 3424b01b03f3SAlan Stern if (status == 0) { 3425bfd1e910SAlan Stern udev->port_is_suspended = 0; 3426a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) { 3427a7114230SAndiry Xu if (portchange & USB_PORT_STAT_C_LINK_STATE) 3428ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3429a7114230SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 3430a7114230SAndiry Xu } else { 3431b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 3432ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3433b01b03f3SAlan Stern USB_PORT_FEAT_C_SUSPEND); 34341da177e4SLinus Torvalds } 3435a7114230SAndiry Xu } 34361da177e4SLinus Torvalds 3437a40178b2SPratyush Anand if (udev->persist_enabled && hub_is_superspeed(hub->hdev)) 3438a40178b2SPratyush Anand status = wait_for_ss_port_enable(udev, hub, &port1, &portchange, 3439a40178b2SPratyush Anand &portstatus); 3440a40178b2SPratyush Anand 3441b01b03f3SAlan Stern status = check_port_resume_type(udev, 3442b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 344354515fe5SAlan Stern if (status == 0) 344454515fe5SAlan Stern status = finish_port_resume(udev); 344554515fe5SAlan Stern if (status < 0) { 344654515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 344754515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 344865580b43SAndiry Xu } else { 344965580b43SAndiry Xu /* Try to enable USB2 hardware LPM */ 345065580b43SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 345165580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 34528306095fSSarah Sharp 3453f74631e3SSarah Sharp /* Try to enable USB3 LTM and LPM */ 3454f74631e3SSarah Sharp usb_enable_ltm(udev); 34558306095fSSarah Sharp usb_unlocked_enable_lpm(udev); 345654515fe5SAlan Stern } 345765580b43SAndiry Xu 34585c79a1e3SDan Williams usb_unlock_port(port_dev); 34595c79a1e3SDan Williams 34601da177e4SLinus Torvalds return status; 34611da177e4SLinus Torvalds } 34621da177e4SLinus Torvalds 34630534d468SAlan Stern int usb_remote_wakeup(struct usb_device *udev) 34641da177e4SLinus Torvalds { 34651da177e4SLinus Torvalds int status = 0; 34661da177e4SLinus Torvalds 34675c79a1e3SDan Williams usb_lock_device(udev); 34681da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 3469645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 34709bbdf1e0SAlan Stern status = usb_autoresume_device(udev); 34719bbdf1e0SAlan Stern if (status == 0) { 34729bbdf1e0SAlan Stern /* Let the drivers do their thing, then... */ 34739bbdf1e0SAlan Stern usb_autosuspend_device(udev); 34749bbdf1e0SAlan Stern } 3475d25450c6SAlan Stern } 34765c79a1e3SDan Williams usb_unlock_device(udev); 34771da177e4SLinus Torvalds return status; 34781da177e4SLinus Torvalds } 34791da177e4SLinus Torvalds 34807e73be22SDan Williams /* Returns 1 if there was a remote wakeup and a connect status change. */ 34817e73be22SDan Williams static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, 34827e73be22SDan Williams u16 portstatus, u16 portchange) 34837e73be22SDan Williams __must_hold(&port_dev->status_lock) 34847e73be22SDan Williams { 34857e73be22SDan Williams struct usb_port *port_dev = hub->ports[port - 1]; 34867e73be22SDan Williams struct usb_device *hdev; 34877e73be22SDan Williams struct usb_device *udev; 34887e73be22SDan Williams int connect_change = 0; 34897e73be22SDan Williams int ret; 34907e73be22SDan Williams 34917e73be22SDan Williams hdev = hub->hdev; 34927e73be22SDan Williams udev = port_dev->child; 34937e73be22SDan Williams if (!hub_is_superspeed(hdev)) { 34947e73be22SDan Williams if (!(portchange & USB_PORT_STAT_C_SUSPEND)) 34957e73be22SDan Williams return 0; 34967e73be22SDan Williams usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); 34977e73be22SDan Williams } else { 34987e73be22SDan Williams if (!udev || udev->state != USB_STATE_SUSPENDED || 34997e73be22SDan Williams (portstatus & USB_PORT_STAT_LINK_STATE) != 35007e73be22SDan Williams USB_SS_PORT_LS_U0) 35017e73be22SDan Williams return 0; 35027e73be22SDan Williams } 35037e73be22SDan Williams 35047e73be22SDan Williams if (udev) { 35057e73be22SDan Williams /* TRSMRCY = 10 msec */ 35067e73be22SDan Williams msleep(10); 35077e73be22SDan Williams 35087e73be22SDan Williams usb_unlock_port(port_dev); 35097e73be22SDan Williams ret = usb_remote_wakeup(udev); 35107e73be22SDan Williams usb_lock_port(port_dev); 35117e73be22SDan Williams if (ret < 0) 35127e73be22SDan Williams connect_change = 1; 35137e73be22SDan Williams } else { 35147e73be22SDan Williams ret = -ENODEV; 35157e73be22SDan Williams hub_port_disable(hub, port, 1); 35167e73be22SDan Williams } 35177e73be22SDan Williams dev_dbg(&port_dev->dev, "resume, status %d\n", ret); 35187e73be22SDan Williams return connect_change; 35197e73be22SDan Williams } 35207e73be22SDan Williams 3521e6f30deaSMing Lei static int check_ports_changed(struct usb_hub *hub) 3522e6f30deaSMing Lei { 3523e6f30deaSMing Lei int port1; 3524e6f30deaSMing Lei 3525e6f30deaSMing Lei for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { 3526e6f30deaSMing Lei u16 portstatus, portchange; 3527e6f30deaSMing Lei int status; 3528e6f30deaSMing Lei 3529e6f30deaSMing Lei status = hub_port_status(hub, port1, &portstatus, &portchange); 3530e6f30deaSMing Lei if (!status && portchange) 3531e6f30deaSMing Lei return 1; 3532e6f30deaSMing Lei } 3533e6f30deaSMing Lei return 0; 3534e6f30deaSMing Lei } 3535e6f30deaSMing Lei 3536db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 35371da177e4SLinus Torvalds { 35381da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 35391da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 35401da177e4SLinus Torvalds unsigned port1; 35414296c70aSSarah Sharp int status; 35421da177e4SLinus Torvalds 3543e583d9dbSAlan Stern /* 3544e583d9dbSAlan Stern * Warn if children aren't already suspended. 3545e583d9dbSAlan Stern * Also, add up the number of wakeup-enabled descendants. 3546e583d9dbSAlan Stern */ 3547e583d9dbSAlan Stern hub->wakeup_enabled_descendants = 0; 35481da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 3549d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 3550d99f6b41SDan Williams struct usb_device *udev = port_dev->child; 35511da177e4SLinus Torvalds 35526840d255SAlan Stern if (udev && udev->can_submit) { 3553b658b8f5SDan Williams dev_warn(&port_dev->dev, "device %s not suspended yet\n", 3554b658b8f5SDan Williams dev_name(&udev->dev)); 35555b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 3556c9f89fa4SDavid Brownell return -EBUSY; 3557c9f89fa4SDavid Brownell } 3558e583d9dbSAlan Stern if (udev) 3559e583d9dbSAlan Stern hub->wakeup_enabled_descendants += 3560e583d9dbSAlan Stern wakeup_enabled_descendants(udev); 35611da177e4SLinus Torvalds } 3562e6f30deaSMing Lei 3563e6f30deaSMing Lei if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { 3564e6f30deaSMing Lei /* check if there are changes pending on hub ports */ 3565e6f30deaSMing Lei if (check_ports_changed(hub)) { 3566e6f30deaSMing Lei if (PMSG_IS_AUTO(msg)) 3567e6f30deaSMing Lei return -EBUSY; 3568e6f30deaSMing Lei pm_wakeup_event(&hdev->dev, 2000); 3569e6f30deaSMing Lei } 3570e6f30deaSMing Lei } 3571e6f30deaSMing Lei 35724296c70aSSarah Sharp if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { 35734296c70aSSarah Sharp /* Enable hub to send remote wakeup for all ports. */ 35744296c70aSSarah Sharp for (port1 = 1; port1 <= hdev->maxchild; port1++) { 35754296c70aSSarah Sharp status = set_port_feature(hdev, 35764296c70aSSarah Sharp port1 | 35774296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_CONNECT | 35784296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | 35794296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, 35804296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_MASK); 35814296c70aSSarah Sharp } 35824296c70aSSarah Sharp } 35831da177e4SLinus Torvalds 3584441b62c1SHarvey Harrison dev_dbg(&intf->dev, "%s\n", __func__); 358540f122f3SAlan Stern 358637ebb549SPetr Mladek /* stop hub_wq and related activity */ 35874330354fSAlan Stern hub_quiesce(hub, HUB_SUSPEND); 3588b6f6436dSAlan Stern return 0; 35891da177e4SLinus Torvalds } 35901da177e4SLinus Torvalds 35911da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 35921da177e4SLinus Torvalds { 35931da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 35941da177e4SLinus Torvalds 35955e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3596f2835219SAlan Stern hub_activate(hub, HUB_RESUME); 35971da177e4SLinus Torvalds return 0; 35981da177e4SLinus Torvalds } 35991da177e4SLinus Torvalds 3600b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 3601f07600cfSAlan Stern { 3602b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 3603f07600cfSAlan Stern 36045e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3605f2835219SAlan Stern hub_activate(hub, HUB_RESET_RESUME); 3606f07600cfSAlan Stern return 0; 3607f07600cfSAlan Stern } 3608f07600cfSAlan Stern 360954515fe5SAlan Stern /** 361054515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 361154515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 361254515fe5SAlan Stern * 361354515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 361454515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 3615feccc30dSAlan Stern * has been reset. The routine marks @rhdev as having lost power. 3616feccc30dSAlan Stern * When the hub driver is resumed it will take notice and carry out 3617feccc30dSAlan Stern * power-session recovery for all the "USB-PERSIST"-enabled child devices; 3618feccc30dSAlan Stern * the others will be disconnected. 361954515fe5SAlan Stern */ 362054515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 362154515fe5SAlan Stern { 362254515fe5SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 362354515fe5SAlan Stern rhdev->reset_resume = 1; 362454515fe5SAlan Stern } 362554515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 362654515fe5SAlan Stern 36271ea7e0e8SSarah Sharp static const char * const usb3_lpm_names[] = { 36281ea7e0e8SSarah Sharp "U0", 36291ea7e0e8SSarah Sharp "U1", 36301ea7e0e8SSarah Sharp "U2", 36311ea7e0e8SSarah Sharp "U3", 36321ea7e0e8SSarah Sharp }; 36331ea7e0e8SSarah Sharp 36341ea7e0e8SSarah Sharp /* 36351ea7e0e8SSarah Sharp * Send a Set SEL control transfer to the device, prior to enabling 36361ea7e0e8SSarah Sharp * device-initiated U1 or U2. This lets the device know the exit latencies from 36371ea7e0e8SSarah Sharp * the time the device initiates a U1 or U2 exit, to the time it will receive a 36381ea7e0e8SSarah Sharp * packet from the host. 36391ea7e0e8SSarah Sharp * 36401ea7e0e8SSarah Sharp * This function will fail if the SEL or PEL values for udev are greater than 36411ea7e0e8SSarah Sharp * the maximum allowed values for the link state to be enabled. 36421ea7e0e8SSarah Sharp */ 36431ea7e0e8SSarah Sharp static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) 36441ea7e0e8SSarah Sharp { 36451ea7e0e8SSarah Sharp struct usb_set_sel_req *sel_values; 36461ea7e0e8SSarah Sharp unsigned long long u1_sel; 36471ea7e0e8SSarah Sharp unsigned long long u1_pel; 36481ea7e0e8SSarah Sharp unsigned long long u2_sel; 36491ea7e0e8SSarah Sharp unsigned long long u2_pel; 36501ea7e0e8SSarah Sharp int ret; 36511ea7e0e8SSarah Sharp 365238d7f688SXenia Ragiadakou if (udev->state != USB_STATE_CONFIGURED) 365338d7f688SXenia Ragiadakou return 0; 365438d7f688SXenia Ragiadakou 36551ea7e0e8SSarah Sharp /* Convert SEL and PEL stored in ns to us */ 36561ea7e0e8SSarah Sharp u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); 36571ea7e0e8SSarah Sharp u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); 36581ea7e0e8SSarah Sharp u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); 36591ea7e0e8SSarah Sharp u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); 36601ea7e0e8SSarah Sharp 36611ea7e0e8SSarah Sharp /* 36621ea7e0e8SSarah Sharp * Make sure that the calculated SEL and PEL values for the link 36631ea7e0e8SSarah Sharp * state we're enabling aren't bigger than the max SEL/PEL 36641ea7e0e8SSarah Sharp * value that will fit in the SET SEL control transfer. 36651ea7e0e8SSarah Sharp * Otherwise the device would get an incorrect idea of the exit 36661ea7e0e8SSarah Sharp * latency for the link state, and could start a device-initiated 36671ea7e0e8SSarah Sharp * U1/U2 when the exit latencies are too high. 36681ea7e0e8SSarah Sharp */ 36691ea7e0e8SSarah Sharp if ((state == USB3_LPM_U1 && 36701ea7e0e8SSarah Sharp (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || 36711ea7e0e8SSarah Sharp u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || 36721ea7e0e8SSarah Sharp (state == USB3_LPM_U2 && 36731ea7e0e8SSarah Sharp (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || 36741ea7e0e8SSarah Sharp u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { 36751510a1a2SSarah Sharp dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", 36761ea7e0e8SSarah Sharp usb3_lpm_names[state], u1_sel, u1_pel); 36771ea7e0e8SSarah Sharp return -EINVAL; 36781ea7e0e8SSarah Sharp } 36791ea7e0e8SSarah Sharp 36801ea7e0e8SSarah Sharp /* 36811ea7e0e8SSarah Sharp * If we're enabling device-initiated LPM for one link state, 36821ea7e0e8SSarah Sharp * but the other link state has a too high SEL or PEL value, 36831ea7e0e8SSarah Sharp * just set those values to the max in the Set SEL request. 36841ea7e0e8SSarah Sharp */ 36851ea7e0e8SSarah Sharp if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) 36861ea7e0e8SSarah Sharp u1_sel = USB3_LPM_MAX_U1_SEL_PEL; 36871ea7e0e8SSarah Sharp 36881ea7e0e8SSarah Sharp if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) 36891ea7e0e8SSarah Sharp u1_pel = USB3_LPM_MAX_U1_SEL_PEL; 36901ea7e0e8SSarah Sharp 36911ea7e0e8SSarah Sharp if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) 36921ea7e0e8SSarah Sharp u2_sel = USB3_LPM_MAX_U2_SEL_PEL; 36931ea7e0e8SSarah Sharp 36941ea7e0e8SSarah Sharp if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) 36951ea7e0e8SSarah Sharp u2_pel = USB3_LPM_MAX_U2_SEL_PEL; 36961ea7e0e8SSarah Sharp 36971ea7e0e8SSarah Sharp /* 36981ea7e0e8SSarah Sharp * usb_enable_lpm() can be called as part of a failed device reset, 36991ea7e0e8SSarah Sharp * which may be initiated by an error path of a mass storage driver. 37001ea7e0e8SSarah Sharp * Therefore, use GFP_NOIO. 37011ea7e0e8SSarah Sharp */ 37021ea7e0e8SSarah Sharp sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); 37031ea7e0e8SSarah Sharp if (!sel_values) 37041ea7e0e8SSarah Sharp return -ENOMEM; 37051ea7e0e8SSarah Sharp 37061ea7e0e8SSarah Sharp sel_values->u1_sel = u1_sel; 37071ea7e0e8SSarah Sharp sel_values->u1_pel = u1_pel; 37081ea7e0e8SSarah Sharp sel_values->u2_sel = cpu_to_le16(u2_sel); 37091ea7e0e8SSarah Sharp sel_values->u2_pel = cpu_to_le16(u2_pel); 37101ea7e0e8SSarah Sharp 37111ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 37121ea7e0e8SSarah Sharp USB_REQ_SET_SEL, 37131ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 37141ea7e0e8SSarah Sharp 0, 0, 37151ea7e0e8SSarah Sharp sel_values, sizeof *(sel_values), 37161ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 37171ea7e0e8SSarah Sharp kfree(sel_values); 37181ea7e0e8SSarah Sharp return ret; 37191ea7e0e8SSarah Sharp } 37201ea7e0e8SSarah Sharp 37211ea7e0e8SSarah Sharp /* 37221ea7e0e8SSarah Sharp * Enable or disable device-initiated U1 or U2 transitions. 37231ea7e0e8SSarah Sharp */ 37241ea7e0e8SSarah Sharp static int usb_set_device_initiated_lpm(struct usb_device *udev, 37251ea7e0e8SSarah Sharp enum usb3_link_state state, bool enable) 37261ea7e0e8SSarah Sharp { 37271ea7e0e8SSarah Sharp int ret; 37281ea7e0e8SSarah Sharp int feature; 37291ea7e0e8SSarah Sharp 37301ea7e0e8SSarah Sharp switch (state) { 37311ea7e0e8SSarah Sharp case USB3_LPM_U1: 37321ea7e0e8SSarah Sharp feature = USB_DEVICE_U1_ENABLE; 37331ea7e0e8SSarah Sharp break; 37341ea7e0e8SSarah Sharp case USB3_LPM_U2: 37351ea7e0e8SSarah Sharp feature = USB_DEVICE_U2_ENABLE; 37361ea7e0e8SSarah Sharp break; 37371ea7e0e8SSarah Sharp default: 37381ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", 37391ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable"); 37401ea7e0e8SSarah Sharp return -EINVAL; 37411ea7e0e8SSarah Sharp } 37421ea7e0e8SSarah Sharp 37431ea7e0e8SSarah Sharp if (udev->state != USB_STATE_CONFIGURED) { 37441ea7e0e8SSarah Sharp dev_dbg(&udev->dev, "%s: Can't %s %s state " 37451ea7e0e8SSarah Sharp "for unconfigured device.\n", 37461ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable", 37471ea7e0e8SSarah Sharp usb3_lpm_names[state]); 37481ea7e0e8SSarah Sharp return 0; 37491ea7e0e8SSarah Sharp } 37501ea7e0e8SSarah Sharp 37511ea7e0e8SSarah Sharp if (enable) { 37521ea7e0e8SSarah Sharp /* 37531ea7e0e8SSarah Sharp * Now send the control transfer to enable device-initiated LPM 37541ea7e0e8SSarah Sharp * for either U1 or U2. 37551ea7e0e8SSarah Sharp */ 37561ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 37571ea7e0e8SSarah Sharp USB_REQ_SET_FEATURE, 37581ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 37591ea7e0e8SSarah Sharp feature, 37601ea7e0e8SSarah Sharp 0, NULL, 0, 37611ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 37621ea7e0e8SSarah Sharp } else { 37631ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 37641ea7e0e8SSarah Sharp USB_REQ_CLEAR_FEATURE, 37651ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 37661ea7e0e8SSarah Sharp feature, 37671ea7e0e8SSarah Sharp 0, NULL, 0, 37681ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 37691ea7e0e8SSarah Sharp } 37701ea7e0e8SSarah Sharp if (ret < 0) { 37711ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", 37721ea7e0e8SSarah Sharp enable ? "Enable" : "Disable", 37731ea7e0e8SSarah Sharp usb3_lpm_names[state]); 37741ea7e0e8SSarah Sharp return -EBUSY; 37751ea7e0e8SSarah Sharp } 37761ea7e0e8SSarah Sharp return 0; 37771ea7e0e8SSarah Sharp } 37781ea7e0e8SSarah Sharp 37791ea7e0e8SSarah Sharp static int usb_set_lpm_timeout(struct usb_device *udev, 37801ea7e0e8SSarah Sharp enum usb3_link_state state, int timeout) 37811ea7e0e8SSarah Sharp { 37821ea7e0e8SSarah Sharp int ret; 37831ea7e0e8SSarah Sharp int feature; 37841ea7e0e8SSarah Sharp 37851ea7e0e8SSarah Sharp switch (state) { 37861ea7e0e8SSarah Sharp case USB3_LPM_U1: 37871ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U1_TIMEOUT; 37881ea7e0e8SSarah Sharp break; 37891ea7e0e8SSarah Sharp case USB3_LPM_U2: 37901ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U2_TIMEOUT; 37911ea7e0e8SSarah Sharp break; 37921ea7e0e8SSarah Sharp default: 37931ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", 37941ea7e0e8SSarah Sharp __func__); 37951ea7e0e8SSarah Sharp return -EINVAL; 37961ea7e0e8SSarah Sharp } 37971ea7e0e8SSarah Sharp 37981ea7e0e8SSarah Sharp if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && 37991ea7e0e8SSarah Sharp timeout != USB3_LPM_DEVICE_INITIATED) { 38001ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " 38011ea7e0e8SSarah Sharp "which is a reserved value.\n", 38021ea7e0e8SSarah Sharp usb3_lpm_names[state], timeout); 38031ea7e0e8SSarah Sharp return -EINVAL; 38041ea7e0e8SSarah Sharp } 38051ea7e0e8SSarah Sharp 38061ea7e0e8SSarah Sharp ret = set_port_feature(udev->parent, 38071ea7e0e8SSarah Sharp USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, 38081ea7e0e8SSarah Sharp feature); 38091ea7e0e8SSarah Sharp if (ret < 0) { 38101ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," 38111ea7e0e8SSarah Sharp "error code %i\n", usb3_lpm_names[state], 38121ea7e0e8SSarah Sharp timeout, ret); 38131ea7e0e8SSarah Sharp return -EBUSY; 38141ea7e0e8SSarah Sharp } 38151ea7e0e8SSarah Sharp if (state == USB3_LPM_U1) 38161ea7e0e8SSarah Sharp udev->u1_params.timeout = timeout; 38171ea7e0e8SSarah Sharp else 38181ea7e0e8SSarah Sharp udev->u2_params.timeout = timeout; 38191ea7e0e8SSarah Sharp return 0; 38201ea7e0e8SSarah Sharp } 38211ea7e0e8SSarah Sharp 38221ea7e0e8SSarah Sharp /* 38231ea7e0e8SSarah Sharp * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated 38241ea7e0e8SSarah Sharp * U1/U2 entry. 38251ea7e0e8SSarah Sharp * 38261ea7e0e8SSarah Sharp * We will attempt to enable U1 or U2, but there are no guarantees that the 38271ea7e0e8SSarah Sharp * control transfers to set the hub timeout or enable device-initiated U1/U2 38281ea7e0e8SSarah Sharp * will be successful. 38291ea7e0e8SSarah Sharp * 38301ea7e0e8SSarah Sharp * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI 38311ea7e0e8SSarah Sharp * driver know about it. If that call fails, it should be harmless, and just 38321ea7e0e8SSarah Sharp * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. 38331ea7e0e8SSarah Sharp */ 38341ea7e0e8SSarah Sharp static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 38351ea7e0e8SSarah Sharp enum usb3_link_state state) 38361ea7e0e8SSarah Sharp { 383765a95b75SSarah Sharp int timeout, ret; 3838ae8963adSSarah Sharp __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; 3839ae8963adSSarah Sharp __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; 3840ae8963adSSarah Sharp 3841ae8963adSSarah Sharp /* If the device says it doesn't have *any* exit latency to come out of 3842ae8963adSSarah Sharp * U1 or U2, it's probably lying. Assume it doesn't implement that link 3843ae8963adSSarah Sharp * state. 3844ae8963adSSarah Sharp */ 3845ae8963adSSarah Sharp if ((state == USB3_LPM_U1 && u1_mel == 0) || 3846ae8963adSSarah Sharp (state == USB3_LPM_U2 && u2_mel == 0)) 3847ae8963adSSarah Sharp return; 38481ea7e0e8SSarah Sharp 384965a95b75SSarah Sharp /* 385065a95b75SSarah Sharp * First, let the device know about the exit latencies 385165a95b75SSarah Sharp * associated with the link state we're about to enable. 385265a95b75SSarah Sharp */ 385365a95b75SSarah Sharp ret = usb_req_set_sel(udev, state); 385465a95b75SSarah Sharp if (ret < 0) { 385565a95b75SSarah Sharp dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", 385665a95b75SSarah Sharp usb3_lpm_names[state]); 385765a95b75SSarah Sharp return; 385865a95b75SSarah Sharp } 385965a95b75SSarah Sharp 38601ea7e0e8SSarah Sharp /* We allow the host controller to set the U1/U2 timeout internally 38611ea7e0e8SSarah Sharp * first, so that it can change its schedule to account for the 38621ea7e0e8SSarah Sharp * additional latency to send data to a device in a lower power 38631ea7e0e8SSarah Sharp * link state. 38641ea7e0e8SSarah Sharp */ 38651ea7e0e8SSarah Sharp timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); 38661ea7e0e8SSarah Sharp 38671ea7e0e8SSarah Sharp /* xHCI host controller doesn't want to enable this LPM state. */ 38681ea7e0e8SSarah Sharp if (timeout == 0) 38691ea7e0e8SSarah Sharp return; 38701ea7e0e8SSarah Sharp 38711ea7e0e8SSarah Sharp if (timeout < 0) { 38721ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not enable %s link state, " 38731ea7e0e8SSarah Sharp "xHCI error %i.\n", usb3_lpm_names[state], 38741ea7e0e8SSarah Sharp timeout); 38751ea7e0e8SSarah Sharp return; 38761ea7e0e8SSarah Sharp } 38771ea7e0e8SSarah Sharp 38781ea7e0e8SSarah Sharp if (usb_set_lpm_timeout(udev, state, timeout)) 38791ea7e0e8SSarah Sharp /* If we can't set the parent hub U1/U2 timeout, 38801ea7e0e8SSarah Sharp * device-initiated LPM won't be allowed either, so let the xHCI 38811ea7e0e8SSarah Sharp * host know that this link state won't be enabled. 38821ea7e0e8SSarah Sharp */ 38831ea7e0e8SSarah Sharp hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); 38841ea7e0e8SSarah Sharp 38851ea7e0e8SSarah Sharp /* Only a configured device will accept the Set Feature U1/U2_ENABLE */ 38861ea7e0e8SSarah Sharp else if (udev->actconfig) 38871ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, true); 38881ea7e0e8SSarah Sharp 38891ea7e0e8SSarah Sharp } 38901ea7e0e8SSarah Sharp 38911ea7e0e8SSarah Sharp /* 38921ea7e0e8SSarah Sharp * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated 38931ea7e0e8SSarah Sharp * U1/U2 entry. 38941ea7e0e8SSarah Sharp * 38951ea7e0e8SSarah Sharp * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. 38961ea7e0e8SSarah Sharp * If zero is returned, the parent will not allow the link to go into U1/U2. 38971ea7e0e8SSarah Sharp * 38981ea7e0e8SSarah Sharp * If zero is returned, device-initiated U1/U2 entry may still be enabled, but 38991ea7e0e8SSarah Sharp * it won't have an effect on the bus link state because the parent hub will 39001ea7e0e8SSarah Sharp * still disallow device-initiated U1/U2 entry. 39011ea7e0e8SSarah Sharp * 39021ea7e0e8SSarah Sharp * If zero is returned, the xHCI host controller may still think U1/U2 entry is 39031ea7e0e8SSarah Sharp * possible. The result will be slightly more bus bandwidth will be taken up 39041ea7e0e8SSarah Sharp * (to account for U1/U2 exit latency), but it should be harmless. 39051ea7e0e8SSarah Sharp */ 39061ea7e0e8SSarah Sharp static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 39071ea7e0e8SSarah Sharp enum usb3_link_state state) 39081ea7e0e8SSarah Sharp { 39091ea7e0e8SSarah Sharp switch (state) { 39101ea7e0e8SSarah Sharp case USB3_LPM_U1: 39111ea7e0e8SSarah Sharp case USB3_LPM_U2: 39121ea7e0e8SSarah Sharp break; 39131ea7e0e8SSarah Sharp default: 39141ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", 39151ea7e0e8SSarah Sharp __func__); 39161ea7e0e8SSarah Sharp return -EINVAL; 39171ea7e0e8SSarah Sharp } 39181ea7e0e8SSarah Sharp 39191ea7e0e8SSarah Sharp if (usb_set_lpm_timeout(udev, state, 0)) 39201ea7e0e8SSarah Sharp return -EBUSY; 39211ea7e0e8SSarah Sharp 39221ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, false); 39231ea7e0e8SSarah Sharp 39241ea7e0e8SSarah Sharp if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) 39251ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " 39261ea7e0e8SSarah Sharp "bus schedule bandwidth may be impacted.\n", 39271ea7e0e8SSarah Sharp usb3_lpm_names[state]); 39281ea7e0e8SSarah Sharp return 0; 39291ea7e0e8SSarah Sharp } 39301ea7e0e8SSarah Sharp 39311ea7e0e8SSarah Sharp /* 39321ea7e0e8SSarah Sharp * Disable hub-initiated and device-initiated U1 and U2 entry. 39331ea7e0e8SSarah Sharp * Caller must own the bandwidth_mutex. 39341ea7e0e8SSarah Sharp * 39351ea7e0e8SSarah Sharp * This will call usb_enable_lpm() on failure, which will decrement 39361ea7e0e8SSarah Sharp * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. 39371ea7e0e8SSarah Sharp */ 39381ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 39391ea7e0e8SSarah Sharp { 39401ea7e0e8SSarah Sharp struct usb_hcd *hcd; 39411ea7e0e8SSarah Sharp 39421ea7e0e8SSarah Sharp if (!udev || !udev->parent || 39431ea7e0e8SSarah Sharp udev->speed != USB_SPEED_SUPER || 394451df62ffSPratyush Anand !udev->lpm_capable || 394551df62ffSPratyush Anand udev->state < USB_STATE_DEFAULT) 39461ea7e0e8SSarah Sharp return 0; 39471ea7e0e8SSarah Sharp 39481ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 39491ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) 39501ea7e0e8SSarah Sharp return 0; 39511ea7e0e8SSarah Sharp 39521ea7e0e8SSarah Sharp udev->lpm_disable_count++; 395355558c33SDan Carpenter if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) 39541ea7e0e8SSarah Sharp return 0; 39551ea7e0e8SSarah Sharp 39561ea7e0e8SSarah Sharp /* If LPM is enabled, attempt to disable it. */ 39571ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) 39581ea7e0e8SSarah Sharp goto enable_lpm; 39591ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) 39601ea7e0e8SSarah Sharp goto enable_lpm; 39611ea7e0e8SSarah Sharp 3962655fe4efSKevin Strasser udev->usb3_lpm_enabled = 0; 3963655fe4efSKevin Strasser 39641ea7e0e8SSarah Sharp return 0; 39651ea7e0e8SSarah Sharp 39661ea7e0e8SSarah Sharp enable_lpm: 39671ea7e0e8SSarah Sharp usb_enable_lpm(udev); 39681ea7e0e8SSarah Sharp return -EBUSY; 39691ea7e0e8SSarah Sharp } 39701ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 39711ea7e0e8SSarah Sharp 39721ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ 39731ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 39741ea7e0e8SSarah Sharp { 39751ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 39761ea7e0e8SSarah Sharp int ret; 39771ea7e0e8SSarah Sharp 39781ea7e0e8SSarah Sharp if (!hcd) 39791ea7e0e8SSarah Sharp return -EINVAL; 39801ea7e0e8SSarah Sharp 39811ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 39821ea7e0e8SSarah Sharp ret = usb_disable_lpm(udev); 39831ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 39841ea7e0e8SSarah Sharp 39851ea7e0e8SSarah Sharp return ret; 39861ea7e0e8SSarah Sharp } 39871ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 39881ea7e0e8SSarah Sharp 39891ea7e0e8SSarah Sharp /* 39901ea7e0e8SSarah Sharp * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The 39911ea7e0e8SSarah Sharp * xHCI host policy may prevent U1 or U2 from being enabled. 39921ea7e0e8SSarah Sharp * 39931ea7e0e8SSarah Sharp * Other callers may have disabled link PM, so U1 and U2 entry will be disabled 39941ea7e0e8SSarah Sharp * until the lpm_disable_count drops to zero. Caller must own the 39951ea7e0e8SSarah Sharp * bandwidth_mutex. 39961ea7e0e8SSarah Sharp */ 39971ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) 39981ea7e0e8SSarah Sharp { 39991ea7e0e8SSarah Sharp struct usb_hcd *hcd; 40001ea7e0e8SSarah Sharp 40011ea7e0e8SSarah Sharp if (!udev || !udev->parent || 40021ea7e0e8SSarah Sharp udev->speed != USB_SPEED_SUPER || 400351df62ffSPratyush Anand !udev->lpm_capable || 400451df62ffSPratyush Anand udev->state < USB_STATE_DEFAULT) 40051ea7e0e8SSarah Sharp return; 40061ea7e0e8SSarah Sharp 40071ea7e0e8SSarah Sharp udev->lpm_disable_count--; 40081ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 40091ea7e0e8SSarah Sharp /* Double check that we can both enable and disable LPM. 40101ea7e0e8SSarah Sharp * Device must be configured to accept set feature U1/U2 timeout. 40111ea7e0e8SSarah Sharp */ 40121ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || 40131ea7e0e8SSarah Sharp !hcd->driver->disable_usb3_lpm_timeout) 40141ea7e0e8SSarah Sharp return; 40151ea7e0e8SSarah Sharp 40161ea7e0e8SSarah Sharp if (udev->lpm_disable_count > 0) 40171ea7e0e8SSarah Sharp return; 40181ea7e0e8SSarah Sharp 40191ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U1); 40201ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U2); 4021655fe4efSKevin Strasser 4022655fe4efSKevin Strasser udev->usb3_lpm_enabled = 1; 40231ea7e0e8SSarah Sharp } 40241ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 40251ea7e0e8SSarah Sharp 40261ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ 40271ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) 40281ea7e0e8SSarah Sharp { 40291ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 40301ea7e0e8SSarah Sharp 40311ea7e0e8SSarah Sharp if (!hcd) 40321ea7e0e8SSarah Sharp return; 40331ea7e0e8SSarah Sharp 40341ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 40351ea7e0e8SSarah Sharp usb_enable_lpm(udev); 40361ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 40371ea7e0e8SSarah Sharp } 40381ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 40391ea7e0e8SSarah Sharp 40401ea7e0e8SSarah Sharp 4041d388dab7SAlan Stern #else /* CONFIG_PM */ 4042d388dab7SAlan Stern 4043511366daSAndrew Morton #define hub_suspend NULL 4044511366daSAndrew Morton #define hub_resume NULL 4045f07600cfSAlan Stern #define hub_reset_resume NULL 40461ea7e0e8SSarah Sharp 40471ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 40481ea7e0e8SSarah Sharp { 40491ea7e0e8SSarah Sharp return 0; 40501ea7e0e8SSarah Sharp } 4051e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 40521ea7e0e8SSarah Sharp 40531ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) { } 4054e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 40551ea7e0e8SSarah Sharp 40561ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 40571ea7e0e8SSarah Sharp { 40581ea7e0e8SSarah Sharp return 0; 40591ea7e0e8SSarah Sharp } 4060e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 40611ea7e0e8SSarah Sharp 40621ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) { } 4063e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 4064f74631e3SSarah Sharp 4065f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 4066f74631e3SSarah Sharp { 4067f74631e3SSarah Sharp return 0; 4068f74631e3SSarah Sharp } 4069f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 4070f74631e3SSarah Sharp 4071f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) { } 4072f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 4073c4b51a43SAlan Stern 40744a95b1fcSStephen Rothwell static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, 40754a95b1fcSStephen Rothwell u16 portstatus, u16 portchange) 40764a95b1fcSStephen Rothwell { 40774a95b1fcSStephen Rothwell return 0; 40784a95b1fcSStephen Rothwell } 40794a95b1fcSStephen Rothwell 4080c4b51a43SAlan Stern #endif /* CONFIG_PM */ 4081d388dab7SAlan Stern 40821da177e4SLinus Torvalds 40831da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 40841da177e4SLinus Torvalds * 40851da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 40861da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 40871da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 40881da177e4SLinus Torvalds * 40891da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 40901da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 40911da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 40921da177e4SLinus Torvalds * 40931da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 40941da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 40951da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 40961da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 40971da177e4SLinus Torvalds */ 4098ad493e5eSLan Tianyu int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) 40991da177e4SLinus Torvalds { 41001da177e4SLinus Torvalds int ret; 41011da177e4SLinus Torvalds u16 portchange, portstatus; 41021da177e4SLinus Torvalds unsigned connection = 0xffff; 4103d99f6b41SDan Williams int total_time, stable_time = 0; 4104d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 41051da177e4SLinus Torvalds 41061da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 41071da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 41081da177e4SLinus Torvalds if (ret < 0) 41091da177e4SLinus Torvalds return ret; 41101da177e4SLinus Torvalds 41111da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 41121da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 4113ad493e5eSLan Tianyu if (!must_be_connected || 4114ad493e5eSLan Tianyu (connection == USB_PORT_STAT_CONNECTION)) 41151da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 41161da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 41171da177e4SLinus Torvalds break; 41181da177e4SLinus Torvalds } else { 41191da177e4SLinus Torvalds stable_time = 0; 41201da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 41211da177e4SLinus Torvalds } 41221da177e4SLinus Torvalds 41231da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 4124ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 41251da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 41261da177e4SLinus Torvalds } 41271da177e4SLinus Torvalds 41281da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 41291da177e4SLinus Torvalds break; 41301da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 41311da177e4SLinus Torvalds } 41321da177e4SLinus Torvalds 4133d99f6b41SDan Williams dev_dbg(&port_dev->dev, "debounce total %dms stable %dms status 0x%x\n", 4134d99f6b41SDan Williams total_time, stable_time, portstatus); 41351da177e4SLinus Torvalds 41361da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 41371da177e4SLinus Torvalds return -ETIMEDOUT; 41381da177e4SLinus Torvalds return portstatus; 41391da177e4SLinus Torvalds } 41401da177e4SLinus Torvalds 4141fc721f51SInaky Perez-Gonzalez void usb_ep0_reinit(struct usb_device *udev) 41421da177e4SLinus Torvalds { 4143ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); 4144ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); 41452caf7fcdSAlan Stern usb_enable_endpoint(udev, &udev->ep0, true); 41461da177e4SLinus Torvalds } 4147fc721f51SInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_ep0_reinit); 41481da177e4SLinus Torvalds 41491da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 41501da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 41511da177e4SLinus Torvalds 41524326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 41531da177e4SLinus Torvalds { 41541da177e4SLinus Torvalds int retval; 4155c6515272SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 41561da177e4SLinus Torvalds 4157c6515272SSarah Sharp /* 4158c6515272SSarah Sharp * The host controller will choose the device address, 4159c6515272SSarah Sharp * instead of the core having chosen it earlier 4160c6515272SSarah Sharp */ 4161c6515272SSarah Sharp if (!hcd->driver->address_device && devnum <= 1) 41621da177e4SLinus Torvalds return -EINVAL; 41631da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 41641da177e4SLinus Torvalds return 0; 41651da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 41661da177e4SLinus Torvalds return -EINVAL; 4167c8d4af8eSAndiry Xu if (hcd->driver->address_device) 4168c6515272SSarah Sharp retval = hcd->driver->address_device(hcd, udev); 4169c8d4af8eSAndiry Xu else 41701da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 41714326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 41721da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 41731da177e4SLinus Torvalds if (retval == 0) { 41743b29b68bSAlan Stern update_devnum(udev, devnum); 41754953d141SDavid Vrabel /* Device now using proper address. */ 41761da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 4177fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 41781da177e4SLinus Torvalds } 41791da177e4SLinus Torvalds return retval; 41801da177e4SLinus Torvalds } 41811da177e4SLinus Torvalds 4182890dae88SMathias Nyman /* 4183890dae88SMathias Nyman * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM 4184890dae88SMathias Nyman * when they're plugged into a USB 2.0 port, but they don't work when LPM is 4185890dae88SMathias Nyman * enabled. 4186890dae88SMathias Nyman * 4187890dae88SMathias Nyman * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the 4188890dae88SMathias Nyman * device says it supports the new USB 2.0 Link PM errata by setting the BESL 4189890dae88SMathias Nyman * support bit in the BOS descriptor. 4190890dae88SMathias Nyman */ 4191890dae88SMathias Nyman static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev) 4192890dae88SMathias Nyman { 4193d99f6b41SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 4194d99f6b41SDan Williams int connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN; 4195890dae88SMathias Nyman 4196890dae88SMathias Nyman if (!udev->usb2_hw_lpm_capable) 4197890dae88SMathias Nyman return; 4198890dae88SMathias Nyman 4199d99f6b41SDan Williams if (hub) 4200d99f6b41SDan Williams connect_type = hub->ports[udev->portnum - 1]->connect_type; 4201890dae88SMathias Nyman 420223c05820SBjørn Mork if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) || 4203890dae88SMathias Nyman connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 4204890dae88SMathias Nyman udev->usb2_hw_lpm_allowed = 1; 4205890dae88SMathias Nyman usb_set_usb2_hardware_lpm(udev, 1); 4206890dae88SMathias Nyman } 4207890dae88SMathias Nyman } 4208890dae88SMathias Nyman 420948fc7dbdSDan Williams static int hub_enable_device(struct usb_device *udev) 421048fc7dbdSDan Williams { 421148fc7dbdSDan Williams struct usb_hcd *hcd = bus_to_hcd(udev->bus); 421248fc7dbdSDan Williams 421348fc7dbdSDan Williams if (!hcd->driver->enable_device) 421448fc7dbdSDan Williams return 0; 421548fc7dbdSDan Williams if (udev->state == USB_STATE_ADDRESS) 421648fc7dbdSDan Williams return 0; 421748fc7dbdSDan Williams if (udev->state != USB_STATE_DEFAULT) 421848fc7dbdSDan Williams return -EINVAL; 421948fc7dbdSDan Williams 422048fc7dbdSDan Williams return hcd->driver->enable_device(hcd, udev); 422148fc7dbdSDan Williams } 422248fc7dbdSDan Williams 42231da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 42241da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 42251da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 42261da177e4SLinus Torvalds * 42271da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 42285c79a1e3SDan Williams * usb_reset_and_verify_device), the caller must own the device lock and 42295c79a1e3SDan Williams * the port lock. For a newly detected device that is not accessible 42305c79a1e3SDan Williams * through any global pointers, it's not necessary to lock the device, 42315c79a1e3SDan Williams * but it is still necessary to lock the port. 42321da177e4SLinus Torvalds */ 42331da177e4SLinus Torvalds static int 42341da177e4SLinus Torvalds hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1, 42351da177e4SLinus Torvalds int retry_counter) 42361da177e4SLinus Torvalds { 42371da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4238e7b77172SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 42391da177e4SLinus Torvalds int i, j, retval; 42401da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 42411da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 4242e538dfdaSMichal Nazarewicz const char *speed; 42434326ed0bSAlan Stern int devnum = udev->devnum; 42441da177e4SLinus Torvalds 42451da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 42461da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 42471da177e4SLinus Torvalds */ 42481da177e4SLinus Torvalds if (!hdev->parent) { 42491da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 42501da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 42511da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 42521da177e4SLinus Torvalds } 42531da177e4SLinus Torvalds 42541da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 42551da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 42561da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 42571da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 42581da177e4SLinus Torvalds 42596fecd4f2STodd E Brandt mutex_lock(&hdev->bus->usb_address0_mutex); 42601da177e4SLinus Torvalds 42611da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 4262e7b77172SSarah Sharp /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ 426375d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 42641da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 42651da177e4SLinus Torvalds goto fail; 42661da177e4SLinus Torvalds /* success, speed is known */ 426707194ab7SLuben Tuikov 42681da177e4SLinus Torvalds retval = -ENODEV; 42691da177e4SLinus Torvalds 42701da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 42711da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 42721da177e4SLinus Torvalds goto fail; 42731da177e4SLinus Torvalds } 42741da177e4SLinus Torvalds oldspeed = udev->speed; 42751da177e4SLinus Torvalds 42761da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 42771da177e4SLinus Torvalds * it's fixed size except for full speed devices. 42785bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 42795bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 42801da177e4SLinus Torvalds */ 42811da177e4SLinus Torvalds switch (udev->speed) { 42826b403b02SSarah Sharp case USB_SPEED_SUPER: 4283551cdbbeSGreg Kroah-Hartman case USB_SPEED_WIRELESS: /* fixed at 512 */ 4284551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); 42855bb6e0aeSInaky Perez-Gonzalez break; 42861da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 4287551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 42881da177e4SLinus Torvalds break; 42891da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 42901da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 42911da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 42921da177e4SLinus Torvalds * then correct our initial guess. 42931da177e4SLinus Torvalds */ 4294551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 42951da177e4SLinus Torvalds break; 42961da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 4297551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); 42981da177e4SLinus Torvalds break; 42991da177e4SLinus Torvalds default: 43001da177e4SLinus Torvalds goto fail; 43011da177e4SLinus Torvalds } 43021da177e4SLinus Torvalds 4303e538dfdaSMichal Nazarewicz if (udev->speed == USB_SPEED_WIRELESS) 4304e538dfdaSMichal Nazarewicz speed = "variable speed Wireless"; 4305e538dfdaSMichal Nazarewicz else 4306e538dfdaSMichal Nazarewicz speed = usb_speed_string(udev->speed); 4307e538dfdaSMichal Nazarewicz 4308c6515272SSarah Sharp if (udev->speed != USB_SPEED_SUPER) 430983a07196SInaky Perez-Gonzalez dev_info(&udev->dev, 4310e538dfdaSMichal Nazarewicz "%s %s USB device number %d using %s\n", 4311e538dfdaSMichal Nazarewicz (udev->config) ? "reset" : "new", speed, 43123b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 43131da177e4SLinus Torvalds 43141da177e4SLinus Torvalds /* Set up TT records, if needed */ 43151da177e4SLinus Torvalds if (hdev->tt) { 43161da177e4SLinus Torvalds udev->tt = hdev->tt; 43171da177e4SLinus Torvalds udev->ttport = hdev->ttport; 43181da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 43191da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 4320d199c96dSAlan Stern if (!hub->tt.hub) { 4321d199c96dSAlan Stern dev_err(&udev->dev, "parent hub has no TT\n"); 4322d199c96dSAlan Stern retval = -EINVAL; 4323d199c96dSAlan Stern goto fail; 4324d199c96dSAlan Stern } 43251da177e4SLinus Torvalds udev->tt = &hub->tt; 43261da177e4SLinus Torvalds udev->ttport = port1; 43271da177e4SLinus Torvalds } 43281da177e4SLinus Torvalds 43291da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 43301da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 43311da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 43321da177e4SLinus Torvalds * Change it cautiously. 43331da177e4SLinus Torvalds * 433448fc7dbdSDan Williams * NOTE: If use_new_scheme() is true we will start by issuing 43351da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 43361da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 43371da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 43381da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 43391da177e4SLinus Torvalds * value. 43401da177e4SLinus Torvalds */ 43411da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 434248fc7dbdSDan Williams bool did_new_scheme = false; 434348fc7dbdSDan Williams 434448fc7dbdSDan Williams if (use_new_scheme(udev, retry_counter)) { 43451da177e4SLinus Torvalds struct usb_device_descriptor *buf; 43461da177e4SLinus Torvalds int r = 0; 43471da177e4SLinus Torvalds 434848fc7dbdSDan Williams did_new_scheme = true; 434948fc7dbdSDan Williams retval = hub_enable_device(udev); 4350938569ebSOliver Neukum if (retval < 0) { 4351938569ebSOliver Neukum dev_err(&udev->dev, 4352938569ebSOliver Neukum "hub failed to enable device, error %d\n", 4353938569ebSOliver Neukum retval); 435448fc7dbdSDan Williams goto fail; 4355938569ebSOliver Neukum } 435648fc7dbdSDan Williams 43571da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 43581da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 43591da177e4SLinus Torvalds if (!buf) { 43601da177e4SLinus Torvalds retval = -ENOMEM; 43611da177e4SLinus Torvalds continue; 43621da177e4SLinus Torvalds } 43631da177e4SLinus Torvalds 4364b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 4365b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 4366b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 43671da177e4SLinus Torvalds */ 43681da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 43691da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 43701da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 43711da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 43721da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 43731da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 4374fd7c519dSJaroslav Kysela initial_descriptor_timeout); 43751da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 43765bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 43771da177e4SLinus Torvalds if (buf->bDescriptorType == 43781da177e4SLinus Torvalds USB_DT_DEVICE) { 43791da177e4SLinus Torvalds r = 0; 43801da177e4SLinus Torvalds break; 43811da177e4SLinus Torvalds } 43821da177e4SLinus Torvalds /* FALL THROUGH */ 43831da177e4SLinus Torvalds default: 43841da177e4SLinus Torvalds if (r == 0) 43851da177e4SLinus Torvalds r = -EPROTO; 43861da177e4SLinus Torvalds break; 43871da177e4SLinus Torvalds } 43881da177e4SLinus Torvalds if (r == 0) 43891da177e4SLinus Torvalds break; 43901da177e4SLinus Torvalds } 43911da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 43921da177e4SLinus Torvalds buf->bMaxPacketSize0; 43931da177e4SLinus Torvalds kfree(buf); 43941da177e4SLinus Torvalds 439575d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 43961da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 43971da177e4SLinus Torvalds goto fail; 43981da177e4SLinus Torvalds if (oldspeed != udev->speed) { 43991da177e4SLinus Torvalds dev_dbg(&udev->dev, 44001da177e4SLinus Torvalds "device reset changed speed!\n"); 44011da177e4SLinus Torvalds retval = -ENODEV; 44021da177e4SLinus Torvalds goto fail; 44031da177e4SLinus Torvalds } 44041da177e4SLinus Torvalds if (r) { 4405e9e88fb7SAlan Stern if (r != -ENODEV) 4406e9e88fb7SAlan Stern dev_err(&udev->dev, "device descriptor read/64, error %d\n", 4407b9cef6c3SWu Fengguang r); 44081da177e4SLinus Torvalds retval = -EMSGSIZE; 44091da177e4SLinus Torvalds continue; 44101da177e4SLinus Torvalds } 44111da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 44121da177e4SLinus Torvalds } 44131da177e4SLinus Torvalds 44146c529cdcSInaky Perez-Gonzalez /* 44156c529cdcSInaky Perez-Gonzalez * If device is WUSB, we already assigned an 44166c529cdcSInaky Perez-Gonzalez * unauthorized address in the Connect Ack sequence; 44176c529cdcSInaky Perez-Gonzalez * authorization will assign the final address. 44186c529cdcSInaky Perez-Gonzalez */ 44196c529cdcSInaky Perez-Gonzalez if (udev->wusb == 0) { 44201da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 44214326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 44221da177e4SLinus Torvalds if (retval >= 0) 44231da177e4SLinus Torvalds break; 44241da177e4SLinus Torvalds msleep(200); 44251da177e4SLinus Torvalds } 44261da177e4SLinus Torvalds if (retval < 0) { 4427e9e88fb7SAlan Stern if (retval != -ENODEV) 4428e9e88fb7SAlan Stern dev_err(&udev->dev, "device not accepting address %d, error %d\n", 44294326ed0bSAlan Stern devnum, retval); 44301da177e4SLinus Torvalds goto fail; 44311da177e4SLinus Torvalds } 4432c6515272SSarah Sharp if (udev->speed == USB_SPEED_SUPER) { 4433c6515272SSarah Sharp devnum = udev->devnum; 4434c6515272SSarah Sharp dev_info(&udev->dev, 44353b29b68bSAlan Stern "%s SuperSpeed USB device number %d using %s\n", 4436c6515272SSarah Sharp (udev->config) ? "reset" : "new", 44373b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 4438c6515272SSarah Sharp } 44391da177e4SLinus Torvalds 44401da177e4SLinus Torvalds /* cope with hardware quirkiness: 44411da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 44421da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 44431da177e4SLinus Torvalds */ 44441da177e4SLinus Torvalds msleep(10); 444548fc7dbdSDan Williams /* use_new_scheme() checks the speed which may have 444648fc7dbdSDan Williams * changed since the initial look so we cache the result 444748fc7dbdSDan Williams * in did_new_scheme 444848fc7dbdSDan Williams */ 444948fc7dbdSDan Williams if (did_new_scheme) 44501da177e4SLinus Torvalds break; 44516c529cdcSInaky Perez-Gonzalez } 44521da177e4SLinus Torvalds 44531da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 44541da177e4SLinus Torvalds if (retval < 8) { 4455e9e88fb7SAlan Stern if (retval != -ENODEV) 4456b9cef6c3SWu Fengguang dev_err(&udev->dev, 4457b9cef6c3SWu Fengguang "device descriptor read/8, error %d\n", 4458b9cef6c3SWu Fengguang retval); 44591da177e4SLinus Torvalds if (retval >= 0) 44601da177e4SLinus Torvalds retval = -EMSGSIZE; 44611da177e4SLinus Torvalds } else { 44621da177e4SLinus Torvalds retval = 0; 44631da177e4SLinus Torvalds break; 44641da177e4SLinus Torvalds } 44651da177e4SLinus Torvalds } 44661da177e4SLinus Torvalds if (retval) 44671da177e4SLinus Torvalds goto fail; 44681da177e4SLinus Torvalds 4469d8aec3dbSElric Fu /* 4470d8aec3dbSElric Fu * Some superspeed devices have finished the link training process 4471d8aec3dbSElric Fu * and attached to a superspeed hub port, but the device descriptor 4472d8aec3dbSElric Fu * got from those devices show they aren't superspeed devices. Warm 4473d8aec3dbSElric Fu * reset the port attached by the devices can fix them. 4474d8aec3dbSElric Fu */ 4475d8aec3dbSElric Fu if ((udev->speed == USB_SPEED_SUPER) && 4476d8aec3dbSElric Fu (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { 4477d8aec3dbSElric Fu dev_err(&udev->dev, "got a wrong device descriptor, " 4478d8aec3dbSElric Fu "warm reset device\n"); 4479d8aec3dbSElric Fu hub_port_reset(hub, port1, udev, 4480d8aec3dbSElric Fu HUB_BH_RESET_TIME, true); 4481d8aec3dbSElric Fu retval = -EINVAL; 4482d8aec3dbSElric Fu goto fail; 4483d8aec3dbSElric Fu } 4484d8aec3dbSElric Fu 44856b403b02SSarah Sharp if (udev->descriptor.bMaxPacketSize0 == 0xff || 44866b403b02SSarah Sharp udev->speed == USB_SPEED_SUPER) 44876b403b02SSarah Sharp i = 512; 44886b403b02SSarah Sharp else 44896b403b02SSarah Sharp i = udev->descriptor.bMaxPacketSize0; 449029cc8897SKuninori Morimoto if (usb_endpoint_maxp(&udev->ep0.desc) != i) { 449156626a72SAlan Stern if (udev->speed == USB_SPEED_LOW || 44921da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 449356626a72SAlan Stern dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); 44941da177e4SLinus Torvalds retval = -EMSGSIZE; 44951da177e4SLinus Torvalds goto fail; 44961da177e4SLinus Torvalds } 449756626a72SAlan Stern if (udev->speed == USB_SPEED_FULL) 44981da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 449956626a72SAlan Stern else 450056626a72SAlan Stern dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); 45011da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 4502fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 45031da177e4SLinus Torvalds } 45041da177e4SLinus Torvalds 45051da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 45061da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 4507e9e88fb7SAlan Stern if (retval != -ENODEV) 4508b9cef6c3SWu Fengguang dev_err(&udev->dev, "device descriptor read/all, error %d\n", 4509b9cef6c3SWu Fengguang retval); 45101da177e4SLinus Torvalds if (retval >= 0) 45111da177e4SLinus Torvalds retval = -ENOMSG; 45121da177e4SLinus Torvalds goto fail; 45131da177e4SLinus Torvalds } 45141da177e4SLinus Torvalds 45151ff4df56SAndiry Xu if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { 45161ff4df56SAndiry Xu retval = usb_get_bos_descriptor(udev); 451751e0a012SSarah Sharp if (!retval) { 4518d9b2099cSSarah Sharp udev->lpm_capable = usb_device_supports_lpm(udev); 451951e0a012SSarah Sharp usb_set_lpm_parameters(udev); 452051e0a012SSarah Sharp } 45211ff4df56SAndiry Xu } 45223148bf04SAndiry Xu 45231da177e4SLinus Torvalds retval = 0; 452448f24970SAlek Du /* notify HCD that we have a device connected and addressed */ 452548f24970SAlek Du if (hcd->driver->update_device) 452648f24970SAlek Du hcd->driver->update_device(hcd, udev); 4527890dae88SMathias Nyman hub_set_initial_usb2_lpm_policy(udev); 45281da177e4SLinus Torvalds fail: 45294326ed0bSAlan Stern if (retval) { 45301da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 45313b29b68bSAlan Stern update_devnum(udev, devnum); /* for disconnect processing */ 45324326ed0bSAlan Stern } 45336fecd4f2STodd E Brandt mutex_unlock(&hdev->bus->usb_address0_mutex); 45341da177e4SLinus Torvalds return retval; 45351da177e4SLinus Torvalds } 45361da177e4SLinus Torvalds 45371da177e4SLinus Torvalds static void 45381da177e4SLinus Torvalds check_highspeed(struct usb_hub *hub, struct usb_device *udev, int port1) 45391da177e4SLinus Torvalds { 45401da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 45411da177e4SLinus Torvalds int status; 45421da177e4SLinus Torvalds 45432a159389SJohan Hovold if (udev->quirks & USB_QUIRK_DEVICE_QUALIFIER) 45442a159389SJohan Hovold return; 45452a159389SJohan Hovold 4546e94b1766SChristoph Lameter qual = kmalloc(sizeof *qual, GFP_KERNEL); 45471da177e4SLinus Torvalds if (qual == NULL) 45481da177e4SLinus Torvalds return; 45491da177e4SLinus Torvalds 45501da177e4SLinus Torvalds status = usb_get_descriptor(udev, USB_DT_DEVICE_QUALIFIER, 0, 45511da177e4SLinus Torvalds qual, sizeof *qual); 45521da177e4SLinus Torvalds if (status == sizeof *qual) { 45531da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 45541da177e4SLinus Torvalds "connect to a high speed hub\n"); 45551da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 45561da177e4SLinus Torvalds if (hub->has_indicators) { 45571da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 455822f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 455922f6a0f0SShaibal Dutta &hub->leds, 0); 45601da177e4SLinus Torvalds } 45611da177e4SLinus Torvalds } 45621da177e4SLinus Torvalds kfree(qual); 45631da177e4SLinus Torvalds } 45641da177e4SLinus Torvalds 45651da177e4SLinus Torvalds static unsigned 45661da177e4SLinus Torvalds hub_power_remaining(struct usb_hub *hub) 45671da177e4SLinus Torvalds { 45681da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 45691da177e4SLinus Torvalds int remaining; 457055c52718SAlan Stern int port1; 45711da177e4SLinus Torvalds 457255c52718SAlan Stern if (!hub->limited_power) 45731da177e4SLinus Torvalds return 0; 45741da177e4SLinus Torvalds 457555c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 457655c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 4577d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 4578d99f6b41SDan Williams struct usb_device *udev = port_dev->child; 4579430ee58eSSebastian Andrzej Siewior unsigned unit_load; 4580d99f6b41SDan Williams int delta; 45811da177e4SLinus Torvalds 45821da177e4SLinus Torvalds if (!udev) 45831da177e4SLinus Torvalds continue; 4584430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(udev)) 4585430ee58eSSebastian Andrzej Siewior unit_load = 150; 4586430ee58eSSebastian Andrzej Siewior else 4587430ee58eSSebastian Andrzej Siewior unit_load = 100; 45881da177e4SLinus Torvalds 4589430ee58eSSebastian Andrzej Siewior /* 4590430ee58eSSebastian Andrzej Siewior * Unconfigured devices may not use more than one unit load, 4591430ee58eSSebastian Andrzej Siewior * or 8mA for OTG ports 4592430ee58eSSebastian Andrzej Siewior */ 45931da177e4SLinus Torvalds if (udev->actconfig) 45948d8479dbSSebastian Andrzej Siewior delta = usb_get_max_power(udev, udev->actconfig); 459555c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 4596430ee58eSSebastian Andrzej Siewior delta = unit_load; 45971da177e4SLinus Torvalds else 459855c52718SAlan Stern delta = 8; 459955c52718SAlan Stern if (delta > hub->mA_per_port) 4600d99f6b41SDan Williams dev_warn(&port_dev->dev, "%dmA is over %umA budget!\n", 4601d99f6b41SDan Williams delta, hub->mA_per_port); 46021da177e4SLinus Torvalds remaining -= delta; 46031da177e4SLinus Torvalds } 46041da177e4SLinus Torvalds if (remaining < 0) { 460555c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 460655c52718SAlan Stern -remaining); 46071da177e4SLinus Torvalds remaining = 0; 46081da177e4SLinus Torvalds } 46091da177e4SLinus Torvalds return remaining; 46101da177e4SLinus Torvalds } 46111da177e4SLinus Torvalds 4612af376a46SDan Williams static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus, 4613af376a46SDan Williams u16 portchange) 46141da177e4SLinus Torvalds { 46151da177e4SLinus Torvalds int status, i; 4616430ee58eSSebastian Andrzej Siewior unsigned unit_load; 46171da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 46181da177e4SLinus Torvalds struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 4619d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 4620af376a46SDan Williams struct usb_device *udev = port_dev->child; 46215ee0f803SOliver Neukum static int unreliable_port = -1; 46228808f00cSAlan Stern 462324618b0cSAlan Stern /* Disconnect any existing devices under this port */ 4624b76baa81SPeter Chen if (udev) { 4625b2108f1eSPeter Chen if (hcd->usb_phy && !hdev->parent) 46263d46e73dSAntoine Tenart usb_phy_notify_disconnect(hcd->usb_phy, udev->speed); 4627d99f6b41SDan Williams usb_disconnect(&port_dev->child); 4628b76baa81SPeter Chen } 462924618b0cSAlan Stern 4630253e0572SAlan Stern /* We can forget about a "removed" device when there's a physical 4631253e0572SAlan Stern * disconnect or the connect status changes. 4632253e0572SAlan Stern */ 4633253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4634253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 4635253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 4636253e0572SAlan Stern 46375257d97aSAlan Stern if (portchange & (USB_PORT_STAT_C_CONNECTION | 46385257d97aSAlan Stern USB_PORT_STAT_C_ENABLE)) { 4639ad493e5eSLan Tianyu status = hub_port_debounce_be_stable(hub, port1); 46405257d97aSAlan Stern if (status < 0) { 46415ee0f803SOliver Neukum if (status != -ENODEV && 46425ee0f803SOliver Neukum port1 != unreliable_port && 46435ee0f803SOliver Neukum printk_ratelimit()) 4644dd5f5006STakashi Iwai dev_err(&port_dev->dev, "connect-debounce failed\n"); 46455257d97aSAlan Stern portstatus &= ~USB_PORT_STAT_CONNECTION; 46465ee0f803SOliver Neukum unreliable_port = port1; 46475257d97aSAlan Stern } else { 46485257d97aSAlan Stern portstatus = status; 46495257d97aSAlan Stern } 46505257d97aSAlan Stern } 46515257d97aSAlan Stern 4652253e0572SAlan Stern /* Return now if debouncing failed or nothing is connected or 4653253e0572SAlan Stern * the device was "removed". 4654253e0572SAlan Stern */ 4655253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4656253e0572SAlan Stern test_bit(port1, hub->removed_bits)) { 46571da177e4SLinus Torvalds 4658fbaecff0SDeepak Das /* 4659fbaecff0SDeepak Das * maybe switch power back on (e.g. root hub was reset) 4660fbaecff0SDeepak Das * but only if the port isn't owned by someone else. 4661fbaecff0SDeepak Das */ 46629262c19dSDan Williams if (hub_is_port_power_switchable(hub) 4663fbaecff0SDeepak Das && !port_is_power_on(hub, portstatus) 4664fbaecff0SDeepak Das && !port_dev->port_owner) 46651da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 46661da177e4SLinus Torvalds 46671da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 46681da177e4SLinus Torvalds goto done; 46691da177e4SLinus Torvalds return; 46701da177e4SLinus Torvalds } 4671430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hub->hdev)) 4672430ee58eSSebastian Andrzej Siewior unit_load = 150; 4673430ee58eSSebastian Andrzej Siewior else 4674430ee58eSSebastian Andrzej Siewior unit_load = 100; 46751da177e4SLinus Torvalds 4676e9e88fb7SAlan Stern status = 0; 46771da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 46781da177e4SLinus Torvalds 46791da177e4SLinus Torvalds /* reallocate for each attempt, since references 46801da177e4SLinus Torvalds * to the previous one can escape in various ways 46811da177e4SLinus Torvalds */ 46821da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 46831da177e4SLinus Torvalds if (!udev) { 4684d99f6b41SDan Williams dev_err(&port_dev->dev, 4685d99f6b41SDan Williams "couldn't allocate usb_device\n"); 46861da177e4SLinus Torvalds goto done; 46871da177e4SLinus Torvalds } 46881da177e4SLinus Torvalds 46891da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 469055c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 4691b6956ffaSAlan Stern udev->level = hdev->level + 1; 46928af548dcSInaky Perez-Gonzalez udev->wusb = hub_is_wusb(hub); 46931da177e4SLinus Torvalds 4694131dec34SSarah Sharp /* Only USB 3.0 devices are connected to SuperSpeed hubs. */ 4695131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 4696e7b77172SSarah Sharp udev->speed = USB_SPEED_SUPER; 4697e7b77172SSarah Sharp else 4698e7b77172SSarah Sharp udev->speed = USB_SPEED_UNKNOWN; 4699e7b77172SSarah Sharp 47003b29b68bSAlan Stern choose_devnum(udev); 4701c6515272SSarah Sharp if (udev->devnum <= 0) { 4702c6515272SSarah Sharp status = -ENOTCONN; /* Don't retry */ 4703c6515272SSarah Sharp goto loop; 4704c6515272SSarah Sharp } 4705c6515272SSarah Sharp 4706e7b77172SSarah Sharp /* reset (non-USB 3.0 devices) and get descriptor */ 47075c79a1e3SDan Williams usb_lock_port(port_dev); 47081da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 47095c79a1e3SDan Williams usb_unlock_port(port_dev); 47101da177e4SLinus Torvalds if (status < 0) 47111da177e4SLinus Torvalds goto loop; 47121da177e4SLinus Torvalds 471393362a87SPhil Dibowitz usb_detect_quirks(udev); 471493362a87SPhil Dibowitz if (udev->quirks & USB_QUIRK_DELAY_INIT) 471593362a87SPhil Dibowitz msleep(1000); 471693362a87SPhil Dibowitz 47171da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 47181da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 47191da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 47201da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 47211da177e4SLinus Torvalds * on the parent. 47221da177e4SLinus Torvalds */ 47231da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 4724430ee58eSSebastian Andrzej Siewior && udev->bus_mA <= unit_load) { 47251da177e4SLinus Torvalds u16 devstat; 47261da177e4SLinus Torvalds 47271da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 47281da177e4SLinus Torvalds &devstat); 472915b7336eSAlan Stern if (status) { 47301da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 47311da177e4SLinus Torvalds goto loop_disable; 47321da177e4SLinus Torvalds } 47331da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 47341da177e4SLinus Torvalds dev_err(&udev->dev, 47351da177e4SLinus Torvalds "can't connect bus-powered hub " 47361da177e4SLinus Torvalds "to this port\n"); 47371da177e4SLinus Torvalds if (hub->has_indicators) { 47381da177e4SLinus Torvalds hub->indicator[port1-1] = 47391da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 474022f6a0f0SShaibal Dutta queue_delayed_work( 474122f6a0f0SShaibal Dutta system_power_efficient_wq, 474222f6a0f0SShaibal Dutta &hub->leds, 0); 47431da177e4SLinus Torvalds } 47441da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 47451da177e4SLinus Torvalds goto loop_disable; 47461da177e4SLinus Torvalds } 47471da177e4SLinus Torvalds } 47481da177e4SLinus Torvalds 47491da177e4SLinus Torvalds /* check for devices running slower than they could */ 47501da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 47511da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 47521da177e4SLinus Torvalds && highspeed_hubs != 0) 47531da177e4SLinus Torvalds check_highspeed(hub, udev, port1); 47541da177e4SLinus Torvalds 4755fa286188SGreg Kroah-Hartman /* Store the parent's children[] pointer. At this point 47561da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 47571da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 47581da177e4SLinus Torvalds */ 47591da177e4SLinus Torvalds status = 0; 47601da177e4SLinus Torvalds 4761d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 4762d8521afeSDan Williams 47631da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 47641da177e4SLinus Torvalds * been disconnected; we would race with the 47651da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 47661da177e4SLinus Torvalds */ 47671da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 47681da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 47691da177e4SLinus Torvalds status = -ENOTCONN; 47701da177e4SLinus Torvalds else 4771d99f6b41SDan Williams port_dev->child = udev; 47721da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 4773d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 47741da177e4SLinus Torvalds 47751da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 47761da177e4SLinus Torvalds if (!status) { 47771da177e4SLinus Torvalds status = usb_new_device(udev); 47781da177e4SLinus Torvalds if (status) { 4779d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 47801da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 4781d99f6b41SDan Williams port_dev->child = NULL; 47821da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 4783d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 478401ed67dcSTony Zheng } else { 478501ed67dcSTony Zheng if (hcd->usb_phy && !hdev->parent) 478601ed67dcSTony Zheng usb_phy_notify_connect(hcd->usb_phy, 478701ed67dcSTony Zheng udev->speed); 47881da177e4SLinus Torvalds } 47891da177e4SLinus Torvalds } 47901da177e4SLinus Torvalds 47911da177e4SLinus Torvalds if (status) 47921da177e4SLinus Torvalds goto loop_disable; 47931da177e4SLinus Torvalds 47941da177e4SLinus Torvalds status = hub_power_remaining(hub); 47951da177e4SLinus Torvalds if (status) 4796d99f6b41SDan Williams dev_dbg(hub->intfdev, "%dmA power budget left\n", status); 47971da177e4SLinus Torvalds 47981da177e4SLinus Torvalds return; 47991da177e4SLinus Torvalds 48001da177e4SLinus Torvalds loop_disable: 48011da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 48021da177e4SLinus Torvalds loop: 4803fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 48043b29b68bSAlan Stern release_devnum(udev); 4805f7410cedSHerbert Xu hub_free_dev(udev); 48061da177e4SLinus Torvalds usb_put_dev(udev); 4807ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 48081da177e4SLinus Torvalds break; 48091da177e4SLinus Torvalds } 48103a31155cSAlan Stern if (hub->hdev->parent || 48113a31155cSAlan Stern !hcd->driver->port_handed_over || 4812e9e88fb7SAlan Stern !(hcd->driver->port_handed_over)(hcd, port1)) { 4813e9e88fb7SAlan Stern if (status != -ENOTCONN && status != -ENODEV) 4814d99f6b41SDan Williams dev_err(&port_dev->dev, 4815d99f6b41SDan Williams "unable to enumerate USB device\n"); 4816e9e88fb7SAlan Stern } 48171da177e4SLinus Torvalds 48181da177e4SLinus Torvalds done: 48191da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 482090da096eSBalaji Rao if (hcd->driver->relinquish_port && !hub->hdev->parent) 482190da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 4822af376a46SDan Williams 48231da177e4SLinus Torvalds } 48241da177e4SLinus Torvalds 4825af376a46SDan Williams /* Handle physical or logical connection change events. 4826af376a46SDan Williams * This routine is called when: 4827af376a46SDan Williams * a port connection-change occurs; 4828af376a46SDan Williams * a port enable-change occurs (often caused by EMI); 4829af376a46SDan Williams * usb_reset_and_verify_device() encounters changed descriptors (as from 4830af376a46SDan Williams * a firmware download) 4831af376a46SDan Williams * caller already locked the hub 4832af376a46SDan Williams */ 4833af376a46SDan Williams static void hub_port_connect_change(struct usb_hub *hub, int port1, 483472937e1eSSarah Sharp u16 portstatus, u16 portchange) 48355c79a1e3SDan Williams __must_hold(&port_dev->status_lock) 4836714b07beSSarah Sharp { 4837af376a46SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 4838af376a46SDan Williams struct usb_device *udev = port_dev->child; 4839af376a46SDan Williams int status = -ENODEV; 4840714b07beSSarah Sharp 4841af376a46SDan Williams dev_dbg(&port_dev->dev, "status %04x, change %04x, %s\n", portstatus, 4842af376a46SDan Williams portchange, portspeed(hub, portstatus)); 4843af376a46SDan Williams 4844af376a46SDan Williams if (hub->has_indicators) { 4845af376a46SDan Williams set_port_led(hub, port1, HUB_LED_AUTO); 4846af376a46SDan Williams hub->indicator[port1-1] = INDICATOR_AUTO; 48474ee823b8SSarah Sharp } 4848714b07beSSarah Sharp 4849af376a46SDan Williams #ifdef CONFIG_USB_OTG 4850af376a46SDan Williams /* during HNP, don't repeat the debounce */ 4851af376a46SDan Williams if (hub->hdev->bus->is_b_host) 4852af376a46SDan Williams portchange &= ~(USB_PORT_STAT_C_CONNECTION | 4853af376a46SDan Williams USB_PORT_STAT_C_ENABLE); 4854af376a46SDan Williams #endif 4855714b07beSSarah Sharp 4856af376a46SDan Williams /* Try to resuscitate an existing device */ 4857af376a46SDan Williams if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && 4858af376a46SDan Williams udev->state != USB_STATE_NOTATTACHED) { 4859af376a46SDan Williams if (portstatus & USB_PORT_STAT_ENABLE) { 4860af376a46SDan Williams status = 0; /* Nothing to do */ 4861ceb6c9c8SRafael J. Wysocki #ifdef CONFIG_PM 4862af376a46SDan Williams } else if (udev->state == USB_STATE_SUSPENDED && 4863af376a46SDan Williams udev->persist_enabled) { 4864af376a46SDan Williams /* For a suspended device, treat this as a 4865af376a46SDan Williams * remote wakeup event. 4866af376a46SDan Williams */ 48675c79a1e3SDan Williams usb_unlock_port(port_dev); 4868af376a46SDan Williams status = usb_remote_wakeup(udev); 48695c79a1e3SDan Williams usb_lock_port(port_dev); 4870af376a46SDan Williams #endif 4871af376a46SDan Williams } else { 4872af376a46SDan Williams /* Don't resuscitate */; 4873af376a46SDan Williams } 4874af376a46SDan Williams } 4875af376a46SDan Williams clear_bit(port1, hub->change_bits); 4876af376a46SDan Williams 48775c79a1e3SDan Williams /* successfully revalidated the connection */ 4878af376a46SDan Williams if (status == 0) 4879af376a46SDan Williams return; 4880af376a46SDan Williams 48815c79a1e3SDan Williams usb_unlock_port(port_dev); 4882af376a46SDan Williams hub_port_connect(hub, port1, portstatus, portchange); 48835c79a1e3SDan Williams usb_lock_port(port_dev); 48841da177e4SLinus Torvalds } 48851da177e4SLinus Torvalds 4886af376a46SDan Williams static void port_event(struct usb_hub *hub, int port1) 48875c79a1e3SDan Williams __must_hold(&port_dev->status_lock) 4888af376a46SDan Williams { 48897671bd1eSZhuang Jin Can int connect_change; 4890af376a46SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 4891af376a46SDan Williams struct usb_device *udev = port_dev->child; 4892af376a46SDan Williams struct usb_device *hdev = hub->hdev; 4893af376a46SDan Williams u16 portstatus, portchange; 4894af376a46SDan Williams 4895af376a46SDan Williams connect_change = test_bit(port1, hub->change_bits); 4896af376a46SDan Williams clear_bit(port1, hub->event_bits); 4897af376a46SDan Williams clear_bit(port1, hub->wakeup_bits); 4898af376a46SDan Williams 4899af376a46SDan Williams if (hub_port_status(hub, port1, &portstatus, &portchange) < 0) 4900af376a46SDan Williams return; 4901af376a46SDan Williams 4902af376a46SDan Williams if (portchange & USB_PORT_STAT_C_CONNECTION) { 4903af376a46SDan Williams usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION); 4904714b07beSSarah Sharp connect_change = 1; 4905714b07beSSarah Sharp } 4906af376a46SDan Williams 4907af376a46SDan Williams if (portchange & USB_PORT_STAT_C_ENABLE) { 4908af376a46SDan Williams if (!connect_change) 4909af376a46SDan Williams dev_dbg(&port_dev->dev, "enable change, status %08x\n", 4910af376a46SDan Williams portstatus); 4911af376a46SDan Williams usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); 4912af376a46SDan Williams 4913af376a46SDan Williams /* 4914af376a46SDan Williams * EM interference sometimes causes badly shielded USB devices 4915af376a46SDan Williams * to be shutdown by the hub, this hack enables them again. 4916af376a46SDan Williams * Works at least with mouse driver. 4917af376a46SDan Williams */ 4918af376a46SDan Williams if (!(portstatus & USB_PORT_STAT_ENABLE) 4919af376a46SDan Williams && !connect_change && udev) { 4920af376a46SDan Williams dev_err(&port_dev->dev, "disabled by hub (EMI?), re-enabling...\n"); 4921af376a46SDan Williams connect_change = 1; 4922714b07beSSarah Sharp } 4923af376a46SDan Williams } 4924af376a46SDan Williams 4925af376a46SDan Williams if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 4926af376a46SDan Williams u16 status = 0, unused; 4927af376a46SDan Williams 4928af376a46SDan Williams dev_dbg(&port_dev->dev, "over-current change\n"); 4929af376a46SDan Williams usb_clear_port_feature(hdev, port1, 4930af376a46SDan Williams USB_PORT_FEAT_C_OVER_CURRENT); 4931af376a46SDan Williams msleep(100); /* Cool down */ 4932af376a46SDan Williams hub_power_on(hub, true); 4933af376a46SDan Williams hub_port_status(hub, port1, &status, &unused); 4934af376a46SDan Williams if (status & USB_PORT_STAT_OVERCURRENT) 4935af376a46SDan Williams dev_err(&port_dev->dev, "over-current condition\n"); 4936af376a46SDan Williams } 4937af376a46SDan Williams 4938af376a46SDan Williams if (portchange & USB_PORT_STAT_C_RESET) { 4939af376a46SDan Williams dev_dbg(&port_dev->dev, "reset change\n"); 4940af376a46SDan Williams usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_RESET); 4941af376a46SDan Williams } 4942af376a46SDan Williams if ((portchange & USB_PORT_STAT_C_BH_RESET) 4943af376a46SDan Williams && hub_is_superspeed(hdev)) { 4944af376a46SDan Williams dev_dbg(&port_dev->dev, "warm reset change\n"); 4945af376a46SDan Williams usb_clear_port_feature(hdev, port1, 4946af376a46SDan Williams USB_PORT_FEAT_C_BH_PORT_RESET); 4947af376a46SDan Williams } 4948af376a46SDan Williams if (portchange & USB_PORT_STAT_C_LINK_STATE) { 4949af376a46SDan Williams dev_dbg(&port_dev->dev, "link state change\n"); 4950af376a46SDan Williams usb_clear_port_feature(hdev, port1, 4951af376a46SDan Williams USB_PORT_FEAT_C_PORT_LINK_STATE); 4952af376a46SDan Williams } 4953af376a46SDan Williams if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { 4954af376a46SDan Williams dev_warn(&port_dev->dev, "config error\n"); 4955af376a46SDan Williams usb_clear_port_feature(hdev, port1, 4956af376a46SDan Williams USB_PORT_FEAT_C_PORT_CONFIG_ERROR); 4957af376a46SDan Williams } 4958af376a46SDan Williams 4959097a155fSDan Williams /* skip port actions that require the port to be powered on */ 4960097a155fSDan Williams if (!pm_runtime_active(&port_dev->dev)) 4961097a155fSDan Williams return; 4962097a155fSDan Williams 4963af376a46SDan Williams if (hub_handle_remote_wakeup(hub, port1, portstatus, portchange)) 4964af376a46SDan Williams connect_change = 1; 4965af376a46SDan Williams 4966af376a46SDan Williams /* 4967af376a46SDan Williams * Warm reset a USB3 protocol port if it's in 4968af376a46SDan Williams * SS.Inactive state. 4969af376a46SDan Williams */ 49703cd12f91SDan Williams if (hub_port_warm_reset_required(hub, port1, portstatus)) { 4971af376a46SDan Williams dev_dbg(&port_dev->dev, "do warm reset\n"); 4972af376a46SDan Williams if (!udev || !(portstatus & USB_PORT_STAT_CONNECTION) 4973af376a46SDan Williams || udev->state == USB_STATE_NOTATTACHED) { 4974af376a46SDan Williams if (hub_port_reset(hub, port1, NULL, 4975af376a46SDan Williams HUB_BH_RESET_TIME, true) < 0) 4976af376a46SDan Williams hub_port_disable(hub, port1, 1); 49777671bd1eSZhuang Jin Can } else { 49785c79a1e3SDan Williams usb_unlock_port(port_dev); 4979af376a46SDan Williams usb_lock_device(udev); 4980af376a46SDan Williams usb_reset_device(udev); 4981af376a46SDan Williams usb_unlock_device(udev); 49825c79a1e3SDan Williams usb_lock_port(port_dev); 4983af376a46SDan Williams connect_change = 0; 4984af376a46SDan Williams } 49857671bd1eSZhuang Jin Can } 4986af376a46SDan Williams 4987af376a46SDan Williams if (connect_change) 4988af376a46SDan Williams hub_port_connect_change(hub, port1, portstatus, portchange); 4989af376a46SDan Williams } 4990af376a46SDan Williams 499132a69589SPetr Mladek static void hub_event(struct work_struct *work) 49921da177e4SLinus Torvalds { 49931da177e4SLinus Torvalds struct usb_device *hdev; 49941da177e4SLinus Torvalds struct usb_interface *intf; 49951da177e4SLinus Torvalds struct usb_hub *hub; 49961da177e4SLinus Torvalds struct device *hub_dev; 49971da177e4SLinus Torvalds u16 hubstatus; 49981da177e4SLinus Torvalds u16 hubchange; 49991da177e4SLinus Torvalds int i, ret; 50001da177e4SLinus Torvalds 500132a69589SPetr Mladek hub = container_of(work, struct usb_hub, events); 50025d14f323SPetr Mladek hdev = hub->hdev; 5003e8054854SAlan Stern hub_dev = hub->intfdev; 5004e8054854SAlan Stern intf = to_usb_interface(hub_dev); 500532a69589SPetr Mladek 500640f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 50073bbc47d8SKrzysztof Mazur hdev->state, hdev->maxchild, 50081da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 50091da177e4SLinus Torvalds (u16) hub->change_bits[0], 501040f122f3SAlan Stern (u16) hub->event_bits[0]); 50111da177e4SLinus Torvalds 50121da177e4SLinus Torvalds /* Lock the device, then check to see if we were 50131da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 501406b84e8aSAlan Stern usb_lock_device(hdev); 5015e8054854SAlan Stern if (unlikely(hub->disconnected)) 501632a69589SPetr Mladek goto out_hdev_lock; 50171da177e4SLinus Torvalds 50181da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 50191da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 50207de18d8bSAlan Stern hub->error = -ENODEV; 50214330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 502232a69589SPetr Mladek goto out_hdev_lock; 50231da177e4SLinus Torvalds } 50241da177e4SLinus Torvalds 502540f122f3SAlan Stern /* Autoresume */ 502640f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 502740f122f3SAlan Stern if (ret) { 502840f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 502932a69589SPetr Mladek goto out_hdev_lock; 503040f122f3SAlan Stern } 503140f122f3SAlan Stern 503240f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 503340f122f3SAlan Stern if (hub->quiescing) 5034eb6e2924SPetr Mladek goto out_autopm; 50351da177e4SLinus Torvalds 50361da177e4SLinus Torvalds if (hub->error) { 5037eb6e2924SPetr Mladek dev_dbg(hub_dev, "resetting for error %d\n", hub->error); 50381da177e4SLinus Torvalds 5039742120c6SMing Lei ret = usb_reset_device(hdev); 50401da177e4SLinus Torvalds if (ret) { 5041eb6e2924SPetr Mladek dev_dbg(hub_dev, "error resetting hub: %d\n", ret); 5042eb6e2924SPetr Mladek goto out_autopm; 50431da177e4SLinus Torvalds } 50441da177e4SLinus Torvalds 50451da177e4SLinus Torvalds hub->nerrors = 0; 50461da177e4SLinus Torvalds hub->error = 0; 50471da177e4SLinus Torvalds } 50481da177e4SLinus Torvalds 50491da177e4SLinus Torvalds /* deal with port status changes */ 50503bbc47d8SKrzysztof Mazur for (i = 1; i <= hdev->maxchild; i++) { 5051097a155fSDan Williams struct usb_port *port_dev = hub->ports[i - 1]; 5052a82b76f7SHans de Goede 50535c79a1e3SDan Williams if (test_bit(i, hub->event_bits) 5054af376a46SDan Williams || test_bit(i, hub->change_bits) 50555c79a1e3SDan Williams || test_bit(i, hub->wakeup_bits)) { 50561da177e4SLinus Torvalds /* 5057097a155fSDan Williams * The get_noresume and barrier ensure that if 5058097a155fSDan Williams * the port was in the process of resuming, we 5059097a155fSDan Williams * flush that work and keep the port active for 5060097a155fSDan Williams * the duration of the port_event(). However, 5061097a155fSDan Williams * if the port is runtime pm suspended 5062097a155fSDan Williams * (powered-off), we leave it in that state, run 5063097a155fSDan Williams * an abbreviated port_event(), and move on. 50641da177e4SLinus Torvalds */ 5065097a155fSDan Williams pm_runtime_get_noresume(&port_dev->dev); 5066097a155fSDan Williams pm_runtime_barrier(&port_dev->dev); 50675c79a1e3SDan Williams usb_lock_port(port_dev); 5068af376a46SDan Williams port_event(hub, i); 50695c79a1e3SDan Williams usb_unlock_port(port_dev); 5070097a155fSDan Williams pm_runtime_put_sync(&port_dev->dev); 50711da177e4SLinus Torvalds } 50721da177e4SLinus Torvalds } 50731da177e4SLinus Torvalds 50741da177e4SLinus Torvalds /* deal with hub status changes */ 50751da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 50761da177e4SLinus Torvalds ; /* do nothing */ 50771da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 50781da177e4SLinus Torvalds dev_err(hub_dev, "get_hub_status failed\n"); 50791da177e4SLinus Torvalds else { 50801da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 50811da177e4SLinus Torvalds dev_dbg(hub_dev, "power change\n"); 50821da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 508355c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 508455c52718SAlan Stern /* FIXME: Is this always true? */ 508555c52718SAlan Stern hub->limited_power = 1; 5086403fae78Sjidong xiao else 5087403fae78Sjidong xiao hub->limited_power = 0; 50881da177e4SLinus Torvalds } 50891da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 5090752d57a8SPaul Bolle u16 status = 0; 5091752d57a8SPaul Bolle u16 unused; 5092752d57a8SPaul Bolle 5093752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change\n"); 50941da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 5095752d57a8SPaul Bolle msleep(500); /* Cool down */ 50968520f380SAlan Stern hub_power_on(hub, true); 5097752d57a8SPaul Bolle hub_hub_status(hub, &status, &unused); 5098752d57a8SPaul Bolle if (status & HUB_STATUS_OVERCURRENT) 5099eb6e2924SPetr Mladek dev_err(hub_dev, "over-current condition\n"); 51001da177e4SLinus Torvalds } 51011da177e4SLinus Torvalds } 51021da177e4SLinus Torvalds 5103eb6e2924SPetr Mladek out_autopm: 51048e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface() above */ 51058e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 510632a69589SPetr Mladek out_hdev_lock: 51071da177e4SLinus Torvalds usb_unlock_device(hdev); 510832a69589SPetr Mladek 510932a69589SPetr Mladek /* Balance the stuff in kick_hub_wq() and allow autosuspend */ 511032a69589SPetr Mladek usb_autopm_put_interface(intf); 5111e8054854SAlan Stern kref_put(&hub->kref, hub_release); 51121da177e4SLinus Torvalds } 51131da177e4SLinus Torvalds 51141e927d96SNémeth Márton static const struct usb_device_id hub_id_table[] = { 5115e6f30deaSMing Lei { .match_flags = USB_DEVICE_ID_MATCH_VENDOR 5116e6f30deaSMing Lei | USB_DEVICE_ID_MATCH_INT_CLASS, 5117e6f30deaSMing Lei .idVendor = USB_VENDOR_GENESYS_LOGIC, 5118e6f30deaSMing Lei .bInterfaceClass = USB_CLASS_HUB, 5119e6f30deaSMing Lei .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, 51201da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 51211da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 51221da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 51231da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 51241da177e4SLinus Torvalds { } /* Terminating entry */ 51251da177e4SLinus Torvalds }; 51261da177e4SLinus Torvalds 51271da177e4SLinus Torvalds MODULE_DEVICE_TABLE(usb, hub_id_table); 51281da177e4SLinus Torvalds 51291da177e4SLinus Torvalds static struct usb_driver hub_driver = { 51301da177e4SLinus Torvalds .name = "hub", 51311da177e4SLinus Torvalds .probe = hub_probe, 51321da177e4SLinus Torvalds .disconnect = hub_disconnect, 51331da177e4SLinus Torvalds .suspend = hub_suspend, 51341da177e4SLinus Torvalds .resume = hub_resume, 5135f07600cfSAlan Stern .reset_resume = hub_reset_resume, 51367de18d8bSAlan Stern .pre_reset = hub_pre_reset, 51377de18d8bSAlan Stern .post_reset = hub_post_reset, 5138c532b29aSAndi Kleen .unlocked_ioctl = hub_ioctl, 51391da177e4SLinus Torvalds .id_table = hub_id_table, 514040f122f3SAlan Stern .supports_autosuspend = 1, 51411da177e4SLinus Torvalds }; 51421da177e4SLinus Torvalds 51431da177e4SLinus Torvalds int usb_hub_init(void) 51441da177e4SLinus Torvalds { 51451da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 51461da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 51471da177e4SLinus Torvalds usbcore_name); 51481da177e4SLinus Torvalds return -1; 51491da177e4SLinus Torvalds } 51501da177e4SLinus Torvalds 515132a69589SPetr Mladek /* 515232a69589SPetr Mladek * The workqueue needs to be freezable to avoid interfering with 515332a69589SPetr Mladek * USB-PERSIST port handover. Otherwise it might see that a full-speed 515432a69589SPetr Mladek * device was gone before the EHCI controller had handed its port 515532a69589SPetr Mladek * over to the companion full-speed controller. 515632a69589SPetr Mladek */ 5157638139ebSPetr Mladek hub_wq = alloc_workqueue("usb_hub_wq", WQ_FREEZABLE, 0); 515832a69589SPetr Mladek if (hub_wq) 51591da177e4SLinus Torvalds return 0; 51601da177e4SLinus Torvalds 51611da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 51621da177e4SLinus Torvalds usb_deregister(&hub_driver); 516332a69589SPetr Mladek pr_err("%s: can't allocate workqueue for usb hub\n", usbcore_name); 51641da177e4SLinus Torvalds 51651da177e4SLinus Torvalds return -1; 51661da177e4SLinus Torvalds } 51671da177e4SLinus Torvalds 51681da177e4SLinus Torvalds void usb_hub_cleanup(void) 51691da177e4SLinus Torvalds { 517032a69589SPetr Mladek destroy_workqueue(hub_wq); 51711da177e4SLinus Torvalds 51721da177e4SLinus Torvalds /* 51731da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 51741da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 51751da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 51761da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 51771da177e4SLinus Torvalds * individual hub resources. -greg 51781da177e4SLinus Torvalds */ 51791da177e4SLinus Torvalds usb_deregister(&hub_driver); 51801da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 51811da177e4SLinus Torvalds 5182eb764c4bSAlan Stern static int descriptors_changed(struct usb_device *udev, 5183e3376d6cSXenia Ragiadakou struct usb_device_descriptor *old_device_descriptor, 5184e3376d6cSXenia Ragiadakou struct usb_host_bos *old_bos) 51851da177e4SLinus Torvalds { 5186eb764c4bSAlan Stern int changed = 0; 51871da177e4SLinus Torvalds unsigned index; 5188eb764c4bSAlan Stern unsigned serial_len = 0; 5189eb764c4bSAlan Stern unsigned len; 5190eb764c4bSAlan Stern unsigned old_length; 5191eb764c4bSAlan Stern int length; 5192eb764c4bSAlan Stern char *buf; 51931da177e4SLinus Torvalds 5194eb764c4bSAlan Stern if (memcmp(&udev->descriptor, old_device_descriptor, 5195eb764c4bSAlan Stern sizeof(*old_device_descriptor)) != 0) 5196eb764c4bSAlan Stern return 1; 5197eb764c4bSAlan Stern 5198e3376d6cSXenia Ragiadakou if ((old_bos && !udev->bos) || (!old_bos && udev->bos)) 5199e3376d6cSXenia Ragiadakou return 1; 5200e3376d6cSXenia Ragiadakou if (udev->bos) { 5201b9a10481SXenia Ragiadakou len = le16_to_cpu(udev->bos->desc->wTotalLength); 5202b9a10481SXenia Ragiadakou if (len != le16_to_cpu(old_bos->desc->wTotalLength)) 5203e3376d6cSXenia Ragiadakou return 1; 5204b9a10481SXenia Ragiadakou if (memcmp(udev->bos->desc, old_bos->desc, len)) 5205e3376d6cSXenia Ragiadakou return 1; 5206e3376d6cSXenia Ragiadakou } 5207e3376d6cSXenia Ragiadakou 5208eb764c4bSAlan Stern /* Since the idVendor, idProduct, and bcdDevice values in the 5209eb764c4bSAlan Stern * device descriptor haven't changed, we will assume the 5210eb764c4bSAlan Stern * Manufacturer and Product strings haven't changed either. 5211eb764c4bSAlan Stern * But the SerialNumber string could be different (e.g., a 5212eb764c4bSAlan Stern * different flash card of the same brand). 5213eb764c4bSAlan Stern */ 5214eb764c4bSAlan Stern if (udev->serial) 5215eb764c4bSAlan Stern serial_len = strlen(udev->serial) + 1; 5216eb764c4bSAlan Stern 5217eb764c4bSAlan Stern len = serial_len; 52181da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 5219eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 5220eb764c4bSAlan Stern len = max(len, old_length); 52211da177e4SLinus Torvalds } 5222eb764c4bSAlan Stern 52230cc1a51fSOliver Neukum buf = kmalloc(len, GFP_NOIO); 52241da177e4SLinus Torvalds if (buf == NULL) { 52251da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 52261da177e4SLinus Torvalds /* assume the worst */ 52271da177e4SLinus Torvalds return 1; 52281da177e4SLinus Torvalds } 52291da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 5230eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 52311da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 52321da177e4SLinus Torvalds old_length); 5233eb764c4bSAlan Stern if (length != old_length) { 52341da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 52351da177e4SLinus Torvalds index, length); 5236eb764c4bSAlan Stern changed = 1; 52371da177e4SLinus Torvalds break; 52381da177e4SLinus Torvalds } 52391da177e4SLinus Torvalds if (memcmp(buf, udev->rawdescriptors[index], old_length) 52401da177e4SLinus Torvalds != 0) { 52411da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 5242eb764c4bSAlan Stern index, 5243eb764c4bSAlan Stern ((struct usb_config_descriptor *) buf)-> 5244eb764c4bSAlan Stern bConfigurationValue); 5245eb764c4bSAlan Stern changed = 1; 52461da177e4SLinus Torvalds break; 52471da177e4SLinus Torvalds } 52481da177e4SLinus Torvalds } 5249eb764c4bSAlan Stern 5250eb764c4bSAlan Stern if (!changed && serial_len) { 5251eb764c4bSAlan Stern length = usb_string(udev, udev->descriptor.iSerialNumber, 5252eb764c4bSAlan Stern buf, serial_len); 5253eb764c4bSAlan Stern if (length + 1 != serial_len) { 5254eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string error %d\n", 5255eb764c4bSAlan Stern length); 5256eb764c4bSAlan Stern changed = 1; 5257eb764c4bSAlan Stern } else if (memcmp(buf, udev->serial, length) != 0) { 5258eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string changed\n"); 5259eb764c4bSAlan Stern changed = 1; 5260eb764c4bSAlan Stern } 5261eb764c4bSAlan Stern } 5262eb764c4bSAlan Stern 52631da177e4SLinus Torvalds kfree(buf); 5264eb764c4bSAlan Stern return changed; 52651da177e4SLinus Torvalds } 52661da177e4SLinus Torvalds 52671da177e4SLinus Torvalds /** 5268742120c6SMing Lei * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device 52691da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 52701da177e4SLinus Torvalds * 527179efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 527279efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 5273742120c6SMing Lei * Use usb_reset_device() instead. 52741da177e4SLinus Torvalds * 52751da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 52761da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 52771da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 52781da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 527937ebb549SPetr Mladek * telling hub_wq to pretend the device has been disconnected and then 52801da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 52811da177e4SLinus Torvalds * re-enumerated and probed all over again. 52821da177e4SLinus Torvalds * 5283626f090cSYacine Belkadi * Return: 0 if the reset succeeded, -ENODEV if the device has been 52841da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 52851da177e4SLinus Torvalds * if the reset wasn't even attempted. 52861da177e4SLinus Torvalds * 5287626f090cSYacine Belkadi * Note: 52885c79a1e3SDan Williams * The caller must own the device lock and the port lock, the latter is 52895c79a1e3SDan Williams * taken by usb_reset_device(). For example, it's safe to use 52905c79a1e3SDan Williams * usb_reset_device() from a driver probe() routine after downloading 52915c79a1e3SDan Williams * new firmware. For calls that might not occur during probe(), drivers 52925c79a1e3SDan Williams * should lock the device using usb_lock_device_for_reset(). 52936bc6cff5SAlan Stern * 52946bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 52956bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 52966bc6cff5SAlan Stern * holding the device lock because these tasks should always call 52975c79a1e3SDan Williams * usb_autopm_resume_device(), thereby preventing any unwanted 52985c79a1e3SDan Williams * autoresume. The autoresume handler is expected to have already 52995c79a1e3SDan Williams * acquired the port lock before calling this routine. 53001da177e4SLinus Torvalds */ 5301742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev) 53021da177e4SLinus Torvalds { 53031da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 53041da177e4SLinus Torvalds struct usb_hub *parent_hub; 53053f0479e0SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 53061da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 5307e3376d6cSXenia Ragiadakou struct usb_host_bos *bos; 53087a7b562dSHans de Goede int i, j, ret = 0; 530912c3da34SAlan Stern int port1 = udev->portnum; 53101da177e4SLinus Torvalds 53111da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 53121da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 53131da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 53141da177e4SLinus Torvalds udev->state); 53151da177e4SLinus Torvalds return -EINVAL; 53161da177e4SLinus Torvalds } 53171da177e4SLinus Torvalds 53185c79a1e3SDan Williams if (!parent_hdev) 53191da177e4SLinus Torvalds return -EISDIR; 53205c79a1e3SDan Williams 5321ad493e5eSLan Tianyu parent_hub = usb_hub_to_struct_hub(parent_hdev); 53221da177e4SLinus Torvalds 5323dcc01c08SSarah Sharp /* Disable USB2 hardware LPM. 5324dcc01c08SSarah Sharp * It will be re-enabled by the enumeration process. 5325dcc01c08SSarah Sharp */ 5326dcc01c08SSarah Sharp if (udev->usb2_hw_lpm_enabled == 1) 5327dcc01c08SSarah Sharp usb_set_usb2_hardware_lpm(udev, 0); 5328dcc01c08SSarah Sharp 5329e3376d6cSXenia Ragiadakou bos = udev->bos; 5330e3376d6cSXenia Ragiadakou udev->bos = NULL; 5331e3376d6cSXenia Ragiadakou 5332f74631e3SSarah Sharp /* Disable LPM and LTM while we reset the device and reinstall the alt 5333f74631e3SSarah Sharp * settings. Device-initiated LPM settings, and system exit latency 5334f74631e3SSarah Sharp * settings are cleared when the device is reset, so we have to set 5335f74631e3SSarah Sharp * them up again. 53366d1d0513SSarah Sharp */ 53376d1d0513SSarah Sharp ret = usb_unlocked_disable_lpm(udev); 53386d1d0513SSarah Sharp if (ret) { 53396d1d0513SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__); 53406d1d0513SSarah Sharp goto re_enumerate; 53416d1d0513SSarah Sharp } 5342f74631e3SSarah Sharp ret = usb_disable_ltm(udev); 5343f74631e3SSarah Sharp if (ret) { 5344f74631e3SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LTM\n.", 5345f74631e3SSarah Sharp __func__); 5346f74631e3SSarah Sharp goto re_enumerate; 5347f74631e3SSarah Sharp } 53486d1d0513SSarah Sharp 53491da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 53501da177e4SLinus Torvalds 53511da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 53521da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 5353fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 53541da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 5355dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 53561da177e4SLinus Torvalds break; 53571da177e4SLinus Torvalds } 5358d5cbad4bSAlan Stern 53591da177e4SLinus Torvalds if (ret < 0) 53601da177e4SLinus Torvalds goto re_enumerate; 53611da177e4SLinus Torvalds 53621da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 5363e3376d6cSXenia Ragiadakou if (descriptors_changed(udev, &descriptor, bos)) { 53641da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 53651da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 53661da177e4SLinus Torvalds goto re_enumerate; 53671da177e4SLinus Torvalds } 53681da177e4SLinus Torvalds 53694fe0387aSAlan Stern /* Restore the device's previous configuration */ 53701da177e4SLinus Torvalds if (!udev->actconfig) 53711da177e4SLinus Torvalds goto done; 53723f0479e0SSarah Sharp 5373d673bfcbSSarah Sharp mutex_lock(hcd->bandwidth_mutex); 53743f0479e0SSarah Sharp ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); 53753f0479e0SSarah Sharp if (ret < 0) { 53763f0479e0SSarah Sharp dev_warn(&udev->dev, 53773f0479e0SSarah Sharp "Busted HC? Not enough HCD resources for " 53783f0479e0SSarah Sharp "old configuration.\n"); 5379d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 53803f0479e0SSarah Sharp goto re_enumerate; 53813f0479e0SSarah Sharp } 53821da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 53831da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 53841da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 53851da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 53861da177e4SLinus Torvalds if (ret < 0) { 53871da177e4SLinus Torvalds dev_err(&udev->dev, 53881da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 53891da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 5390d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 53911da177e4SLinus Torvalds goto re_enumerate; 53921da177e4SLinus Torvalds } 5393d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 53941da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 53951da177e4SLinus Torvalds 53964fe0387aSAlan Stern /* Put interfaces back into the same altsettings as before. 53974fe0387aSAlan Stern * Don't bother to send the Set-Interface request for interfaces 53984fe0387aSAlan Stern * that were already in altsetting 0; besides being unnecessary, 53994fe0387aSAlan Stern * many devices can't handle it. Instead just reset the host-side 54004fe0387aSAlan Stern * endpoint state. 54014fe0387aSAlan Stern */ 54021da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 54033f0479e0SSarah Sharp struct usb_host_config *config = udev->actconfig; 54043f0479e0SSarah Sharp struct usb_interface *intf = config->interface[i]; 54051da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 54061da177e4SLinus Torvalds 54071da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 54084fe0387aSAlan Stern if (desc->bAlternateSetting == 0) { 54094fe0387aSAlan Stern usb_disable_interface(udev, intf, true); 54104fe0387aSAlan Stern usb_enable_interface(udev, intf, true); 54114fe0387aSAlan Stern ret = 0; 54124fe0387aSAlan Stern } else { 541304a723eaSSarah Sharp /* Let the bandwidth allocation function know that this 541404a723eaSSarah Sharp * device has been reset, and it will have to use 541504a723eaSSarah Sharp * alternate setting 0 as the current alternate setting. 54163f0479e0SSarah Sharp */ 541704a723eaSSarah Sharp intf->resetting_device = 1; 54181da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 54191da177e4SLinus Torvalds desc->bAlternateSetting); 542004a723eaSSarah Sharp intf->resetting_device = 0; 54214fe0387aSAlan Stern } 54221da177e4SLinus Torvalds if (ret < 0) { 54231da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 54241da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 54251da177e4SLinus Torvalds desc->bInterfaceNumber, 54261da177e4SLinus Torvalds desc->bAlternateSetting, 54271da177e4SLinus Torvalds ret); 54281da177e4SLinus Torvalds goto re_enumerate; 54291da177e4SLinus Torvalds } 54307a7b562dSHans de Goede /* Resetting also frees any allocated streams */ 54317a7b562dSHans de Goede for (j = 0; j < intf->cur_altsetting->desc.bNumEndpoints; j++) 54327a7b562dSHans de Goede intf->cur_altsetting->endpoint[j].streams = 0; 54331da177e4SLinus Torvalds } 54341da177e4SLinus Torvalds 54351da177e4SLinus Torvalds done: 5436f74631e3SSarah Sharp /* Now that the alt settings are re-installed, enable LTM and LPM. */ 5437de68bab4SSarah Sharp usb_set_usb2_hardware_lpm(udev, 1); 543878d9a487SAlan Stern usb_unlocked_enable_lpm(udev); 5439f74631e3SSarah Sharp usb_enable_ltm(udev); 5440e3376d6cSXenia Ragiadakou usb_release_bos_descriptor(udev); 5441e3376d6cSXenia Ragiadakou udev->bos = bos; 54421da177e4SLinus Torvalds return 0; 54431da177e4SLinus Torvalds 54441da177e4SLinus Torvalds re_enumerate: 54456d1d0513SSarah Sharp /* LPM state doesn't matter when we're about to destroy the device. */ 54461da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 5447e3376d6cSXenia Ragiadakou usb_release_bos_descriptor(udev); 5448e3376d6cSXenia Ragiadakou udev->bos = bos; 54491da177e4SLinus Torvalds return -ENODEV; 54501da177e4SLinus Torvalds } 54511da177e4SLinus Torvalds 54521da177e4SLinus Torvalds /** 54531da177e4SLinus Torvalds * usb_reset_device - warn interface drivers and perform a USB port reset 54541da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 54551da177e4SLinus Torvalds * 545679efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 545779efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 5458742120c6SMing Lei * the reset is over (using their post_reset method). 545979efa097SAlan Stern * 5460626f090cSYacine Belkadi * Return: The same as for usb_reset_and_verify_device(). 546179efa097SAlan Stern * 5462626f090cSYacine Belkadi * Note: 546379efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 546479efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 546579efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 5466742120c6SMing Lei * the device using usb_lock_device_for_reset(). 546779efa097SAlan Stern * 546879efa097SAlan Stern * If an interface is currently being probed or disconnected, we assume 546979efa097SAlan Stern * its driver knows how to handle resets. For all other interfaces, 547079efa097SAlan Stern * if the driver doesn't have pre_reset and post_reset methods then 547179efa097SAlan Stern * we attempt to unbind it and rebind afterward. 547279efa097SAlan Stern */ 5473742120c6SMing Lei int usb_reset_device(struct usb_device *udev) 547479efa097SAlan Stern { 547579efa097SAlan Stern int ret; 5476852c4b43SAlan Stern int i; 54774d769defSMing Lei unsigned int noio_flag; 54785c79a1e3SDan Williams struct usb_port *port_dev; 547979efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 54805c79a1e3SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 548179efa097SAlan Stern 548279efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 548379efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 548479efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 548579efa097SAlan Stern udev->state); 548679efa097SAlan Stern return -EINVAL; 548779efa097SAlan Stern } 548879efa097SAlan Stern 54895c79a1e3SDan Williams if (!udev->parent) { 54905c79a1e3SDan Williams /* this requires hcd-specific logic; see ohci_restart() */ 54915c79a1e3SDan Williams dev_dbg(&udev->dev, "%s for root hub!\n", __func__); 54925c79a1e3SDan Williams return -EISDIR; 54935c79a1e3SDan Williams } 54945c79a1e3SDan Williams 54955c79a1e3SDan Williams port_dev = hub->ports[udev->portnum - 1]; 54965c79a1e3SDan Williams 54974d769defSMing Lei /* 54984d769defSMing Lei * Don't allocate memory with GFP_KERNEL in current 54994d769defSMing Lei * context to avoid possible deadlock if usb mass 55004d769defSMing Lei * storage interface or usbnet interface(iSCSI case) 55014d769defSMing Lei * is included in current configuration. The easist 55024d769defSMing Lei * approach is to do it for every device reset, 55034d769defSMing Lei * because the device 'memalloc_noio' flag may have 55044d769defSMing Lei * not been set before reseting the usb device. 55054d769defSMing Lei */ 55064d769defSMing Lei noio_flag = memalloc_noio_save(); 55074d769defSMing Lei 5508645daaabSAlan Stern /* Prevent autosuspend during the reset */ 550994fcda1fSAlan Stern usb_autoresume_device(udev); 5510645daaabSAlan Stern 551179efa097SAlan Stern if (config) { 5512852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 5513852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 551479efa097SAlan Stern struct usb_driver *drv; 551578d9a487SAlan Stern int unbind = 0; 551679efa097SAlan Stern 5517852c4b43SAlan Stern if (cintf->dev.driver) { 551879efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 551978d9a487SAlan Stern if (drv->pre_reset && drv->post_reset) 552078d9a487SAlan Stern unbind = (drv->pre_reset)(cintf); 552178d9a487SAlan Stern else if (cintf->condition == 552278d9a487SAlan Stern USB_INTERFACE_BOUND) 552378d9a487SAlan Stern unbind = 1; 552478d9a487SAlan Stern if (unbind) 552578d9a487SAlan Stern usb_forced_unbind_intf(cintf); 552679efa097SAlan Stern } 552779efa097SAlan Stern } 552879efa097SAlan Stern } 552979efa097SAlan Stern 55305c79a1e3SDan Williams usb_lock_port(port_dev); 5531742120c6SMing Lei ret = usb_reset_and_verify_device(udev); 55325c79a1e3SDan Williams usb_unlock_port(port_dev); 553379efa097SAlan Stern 553479efa097SAlan Stern if (config) { 5535852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 5536852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 553779efa097SAlan Stern struct usb_driver *drv; 553878d9a487SAlan Stern int rebind = cintf->needs_binding; 553979efa097SAlan Stern 554078d9a487SAlan Stern if (!rebind && cintf->dev.driver) { 554179efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 554279efa097SAlan Stern if (drv->post_reset) 554378d9a487SAlan Stern rebind = (drv->post_reset)(cintf); 554478d9a487SAlan Stern else if (cintf->condition == 554578d9a487SAlan Stern USB_INTERFACE_BOUND) 554678d9a487SAlan Stern rebind = 1; 55476aec044cSAlan Stern if (rebind) 55486aec044cSAlan Stern cintf->needs_binding = 1; 554979efa097SAlan Stern } 555079efa097SAlan Stern } 55516aec044cSAlan Stern usb_unbind_and_rebind_marked_interfaces(udev); 555279efa097SAlan Stern } 555379efa097SAlan Stern 555494fcda1fSAlan Stern usb_autosuspend_device(udev); 55554d769defSMing Lei memalloc_noio_restore(noio_flag); 555679efa097SAlan Stern return ret; 555779efa097SAlan Stern } 5558742120c6SMing Lei EXPORT_SYMBOL_GPL(usb_reset_device); 5559dc023dceSInaky Perez-Gonzalez 5560dc023dceSInaky Perez-Gonzalez 5561dc023dceSInaky Perez-Gonzalez /** 5562dc023dceSInaky Perez-Gonzalez * usb_queue_reset_device - Reset a USB device from an atomic context 5563dc023dceSInaky Perez-Gonzalez * @iface: USB interface belonging to the device to reset 5564dc023dceSInaky Perez-Gonzalez * 5565dc023dceSInaky Perez-Gonzalez * This function can be used to reset a USB device from an atomic 5566dc023dceSInaky Perez-Gonzalez * context, where usb_reset_device() won't work (as it blocks). 5567dc023dceSInaky Perez-Gonzalez * 5568dc023dceSInaky Perez-Gonzalez * Doing a reset via this method is functionally equivalent to calling 5569dc023dceSInaky Perez-Gonzalez * usb_reset_device(), except for the fact that it is delayed to a 5570dc023dceSInaky Perez-Gonzalez * workqueue. This means that any drivers bound to other interfaces 5571dc023dceSInaky Perez-Gonzalez * might be unbound, as well as users from usbfs in user space. 5572dc023dceSInaky Perez-Gonzalez * 5573dc023dceSInaky Perez-Gonzalez * Corner cases: 5574dc023dceSInaky Perez-Gonzalez * 5575dc023dceSInaky Perez-Gonzalez * - Scheduling two resets at the same time from two different drivers 5576dc023dceSInaky Perez-Gonzalez * attached to two different interfaces of the same device is 5577dc023dceSInaky Perez-Gonzalez * possible; depending on how the driver attached to each interface 5578dc023dceSInaky Perez-Gonzalez * handles ->pre_reset(), the second reset might happen or not. 5579dc023dceSInaky Perez-Gonzalez * 5580524134d4SAlan Stern * - If the reset is delayed so long that the interface is unbound from 5581524134d4SAlan Stern * its driver, the reset will be skipped. 5582dc023dceSInaky Perez-Gonzalez * 5583524134d4SAlan Stern * - This function can be called during .probe(). It can also be called 5584524134d4SAlan Stern * during .disconnect(), but doing so is pointless because the reset 5585524134d4SAlan Stern * will not occur. If you really want to reset the device during 5586524134d4SAlan Stern * .disconnect(), call usb_reset_device() directly -- but watch out 5587524134d4SAlan Stern * for nested unbinding issues! 5588dc023dceSInaky Perez-Gonzalez */ 5589dc023dceSInaky Perez-Gonzalez void usb_queue_reset_device(struct usb_interface *iface) 5590dc023dceSInaky Perez-Gonzalez { 5591524134d4SAlan Stern if (schedule_work(&iface->reset_ws)) 5592524134d4SAlan Stern usb_get_intf(iface); 5593dc023dceSInaky Perez-Gonzalez } 5594dc023dceSInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_queue_reset_device); 5595ff823c79SLan Tianyu 5596ff823c79SLan Tianyu /** 5597ff823c79SLan Tianyu * usb_hub_find_child - Get the pointer of child device 5598ff823c79SLan Tianyu * attached to the port which is specified by @port1. 5599ff823c79SLan Tianyu * @hdev: USB device belonging to the usb hub 5600ff823c79SLan Tianyu * @port1: port num to indicate which port the child device 5601ff823c79SLan Tianyu * is attached to. 5602ff823c79SLan Tianyu * 5603ff823c79SLan Tianyu * USB drivers call this function to get hub's child device 5604ff823c79SLan Tianyu * pointer. 5605ff823c79SLan Tianyu * 5606626f090cSYacine Belkadi * Return: %NULL if input param is invalid and 5607ff823c79SLan Tianyu * child's usb_device pointer if non-NULL. 5608ff823c79SLan Tianyu */ 5609ff823c79SLan Tianyu struct usb_device *usb_hub_find_child(struct usb_device *hdev, 5610ff823c79SLan Tianyu int port1) 5611ff823c79SLan Tianyu { 5612ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5613ff823c79SLan Tianyu 5614ff823c79SLan Tianyu if (port1 < 1 || port1 > hdev->maxchild) 5615ff823c79SLan Tianyu return NULL; 5616ff823c79SLan Tianyu return hub->ports[port1 - 1]->child; 5617ff823c79SLan Tianyu } 5618ff823c79SLan Tianyu EXPORT_SYMBOL_GPL(usb_hub_find_child); 5619d5575424SLan Tianyu 5620d2123fd9SLan Tianyu void usb_hub_adjust_deviceremovable(struct usb_device *hdev, 5621d2123fd9SLan Tianyu struct usb_hub_descriptor *desc) 5622d2123fd9SLan Tianyu { 5623d99f6b41SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5624d2123fd9SLan Tianyu enum usb_port_connect_type connect_type; 5625d2123fd9SLan Tianyu int i; 5626d2123fd9SLan Tianyu 5627d99f6b41SDan Williams if (!hub) 5628d99f6b41SDan Williams return; 5629d99f6b41SDan Williams 5630d2123fd9SLan Tianyu if (!hub_is_superspeed(hdev)) { 5631d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 5632d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[i - 1]; 5633d2123fd9SLan Tianyu 5634d99f6b41SDan Williams connect_type = port_dev->connect_type; 5635d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 5636d2123fd9SLan Tianyu u8 mask = 1 << (i%8); 5637d2123fd9SLan Tianyu 5638d2123fd9SLan Tianyu if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { 5639d99f6b41SDan Williams dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); 5640d2123fd9SLan Tianyu desc->u.hs.DeviceRemovable[i/8] |= mask; 5641d2123fd9SLan Tianyu } 5642d2123fd9SLan Tianyu } 5643d2123fd9SLan Tianyu } 5644d2123fd9SLan Tianyu } else { 5645d2123fd9SLan Tianyu u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); 5646d2123fd9SLan Tianyu 5647d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 5648d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[i - 1]; 5649d2123fd9SLan Tianyu 5650d99f6b41SDan Williams connect_type = port_dev->connect_type; 5651d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 5652d2123fd9SLan Tianyu u16 mask = 1 << i; 5653d2123fd9SLan Tianyu 5654d2123fd9SLan Tianyu if (!(port_removable & mask)) { 5655d99f6b41SDan Williams dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); 5656d2123fd9SLan Tianyu port_removable |= mask; 5657d2123fd9SLan Tianyu } 5658d2123fd9SLan Tianyu } 5659d2123fd9SLan Tianyu } 5660d2123fd9SLan Tianyu 5661d2123fd9SLan Tianyu desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); 5662d2123fd9SLan Tianyu } 5663d2123fd9SLan Tianyu } 5664d2123fd9SLan Tianyu 5665d5575424SLan Tianyu #ifdef CONFIG_ACPI 5666d5575424SLan Tianyu /** 5667d5575424SLan Tianyu * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle 5668d5575424SLan Tianyu * @hdev: USB device belonging to the usb hub 5669d5575424SLan Tianyu * @port1: port num of the port 5670d5575424SLan Tianyu * 5671626f090cSYacine Belkadi * Return: Port's acpi handle if successful, %NULL if params are 5672626f090cSYacine Belkadi * invalid. 5673d5575424SLan Tianyu */ 5674d5575424SLan Tianyu acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, 5675d5575424SLan Tianyu int port1) 5676d5575424SLan Tianyu { 5677ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5678d5575424SLan Tianyu 567941341261SMathias Nyman if (!hub) 568041341261SMathias Nyman return NULL; 568141341261SMathias Nyman 56823a83f992SRafael J. Wysocki return ACPI_HANDLE(&hub->ports[port1 - 1]->dev); 5683d5575424SLan Tianyu } 5684d5575424SLan Tianyu #endif 5685