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> 259c8d6178Sakpm@osdl.org #include <linux/kthread.h> 264186ecf8SArjan van de Ven #include <linux/mutex.h> 277dfb7103SNigel Cunningham #include <linux/freezer.h> 28b04b3156STheodore Ts'o #include <linux/random.h> 29ad493e5eSLan Tianyu #include <linux/pm_qos.h> 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #include <asm/uaccess.h> 321da177e4SLinus Torvalds #include <asm/byteorder.h> 331da177e4SLinus Torvalds 346e30d7cbSLan Tianyu #include "hub.h" 351da177e4SLinus Torvalds 36e6f30deaSMing Lei #define USB_VENDOR_GENESYS_LOGIC 0x05e3 37e6f30deaSMing Lei #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01 38e6f30deaSMing Lei 39dbe79bbeSJohn Youn static inline int hub_is_superspeed(struct usb_device *hdev) 40dbe79bbeSJohn Youn { 417bf01185SAman Deep return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS); 42dbe79bbeSJohn Youn } 431bb5f66bSAlan Stern 44fa286188SGreg Kroah-Hartman /* Protect struct usb_device->state and ->children members 459ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 461da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 471da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds /* khubd's worklist and its lock */ 501da177e4SLinus Torvalds static DEFINE_SPINLOCK(hub_event_lock); 511da177e4SLinus Torvalds static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds /* Wakes up khubd */ 541da177e4SLinus Torvalds static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); 551da177e4SLinus Torvalds 569c8d6178Sakpm@osdl.org static struct task_struct *khubd_task; 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 5990ab5ee9SRusty Russell static bool blinkenlights = 0; 601da177e4SLinus Torvalds module_param (blinkenlights, bool, S_IRUGO); 611da177e4SLinus Torvalds MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds /* 64fd7c519dSJaroslav Kysela * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about 65fd7c519dSJaroslav Kysela * 10 seconds to send reply for the initial 64-byte descriptor request. 66fd7c519dSJaroslav Kysela */ 67fd7c519dSJaroslav Kysela /* define initial 64-byte descriptor request timeout in milliseconds */ 68fd7c519dSJaroslav Kysela static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; 69fd7c519dSJaroslav Kysela module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); 70b9cef6c3SWu Fengguang MODULE_PARM_DESC(initial_descriptor_timeout, 71b9cef6c3SWu Fengguang "initial 64-byte descriptor request timeout in milliseconds " 72b9cef6c3SWu Fengguang "(default 5000 - 5.0 seconds)"); 73fd7c519dSJaroslav Kysela 74fd7c519dSJaroslav Kysela /* 751da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 761da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 771da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 781da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 791da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 801da177e4SLinus Torvalds * following module parameters. 811da177e4SLinus Torvalds * 821da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 831da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 841da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 851da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 861da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 871da177e4SLinus Torvalds */ 8890ab5ee9SRusty Russell static bool old_scheme_first = 0; 891da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 901da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 911da177e4SLinus Torvalds "start with the old device initialization scheme"); 921da177e4SLinus Torvalds 9390ab5ee9SRusty Russell static bool use_both_schemes = 1; 941da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 951da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 961da177e4SLinus Torvalds "try the other device initialization scheme if the " 971da177e4SLinus Torvalds "first one fails"); 981da177e4SLinus Torvalds 9932fe0198SAlan Stern /* Mutual exclusion for EHCI CF initialization. This interferes with 10032fe0198SAlan Stern * port reset on some companion controllers. 10132fe0198SAlan Stern */ 10232fe0198SAlan Stern DECLARE_RWSEM(ehci_cf_port_reset_rwsem); 10332fe0198SAlan Stern EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); 10432fe0198SAlan Stern 105ad493e5eSLan Tianyu #define HUB_DEBOUNCE_TIMEOUT 2000 106948fea37SAlan Stern #define HUB_DEBOUNCE_STEP 25 107948fea37SAlan Stern #define HUB_DEBOUNCE_STABLE 100 108948fea37SAlan Stern 109742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev); 110742120c6SMing Lei 111131dec34SSarah Sharp static inline char *portspeed(struct usb_hub *hub, int portstatus) 1121da177e4SLinus Torvalds { 113131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 114131dec34SSarah Sharp return "5.0 Gb/s"; 115288ead45SAlan Stern if (portstatus & USB_PORT_STAT_HIGH_SPEED) 1161da177e4SLinus Torvalds return "480 Mb/s"; 117288ead45SAlan Stern else if (portstatus & USB_PORT_STAT_LOW_SPEED) 1181da177e4SLinus Torvalds return "1.5 Mb/s"; 1191da177e4SLinus Torvalds else 1201da177e4SLinus Torvalds return "12 Mb/s"; 1211da177e4SLinus Torvalds } 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 124ad493e5eSLan Tianyu struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev) 1251da177e4SLinus Torvalds { 126ff823c79SLan Tianyu if (!hdev || !hdev->actconfig || !hdev->maxchild) 12725118084SAlan Stern return NULL; 1281da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1291da177e4SLinus Torvalds } 1301da177e4SLinus Torvalds 131140e3026SSarah Sharp static int usb_device_supports_lpm(struct usb_device *udev) 132d9b2099cSSarah Sharp { 133d9b2099cSSarah Sharp /* USB 2.1 (and greater) devices indicate LPM support through 134d9b2099cSSarah Sharp * their USB 2.0 Extended Capabilities BOS descriptor. 135d9b2099cSSarah Sharp */ 136d9b2099cSSarah Sharp if (udev->speed == USB_SPEED_HIGH) { 137d9b2099cSSarah Sharp if (udev->bos->ext_cap && 138d9b2099cSSarah Sharp (USB_LPM_SUPPORT & 139d9b2099cSSarah Sharp le32_to_cpu(udev->bos->ext_cap->bmAttributes))) 140d9b2099cSSarah Sharp return 1; 141d9b2099cSSarah Sharp return 0; 142d9b2099cSSarah Sharp } 14351e0a012SSarah Sharp 14425cd2882SSarah Sharp /* 14525cd2882SSarah Sharp * According to the USB 3.0 spec, all USB 3.0 devices must support LPM. 14625cd2882SSarah Sharp * However, there are some that don't, and they set the U1/U2 exit 14725cd2882SSarah Sharp * latencies to zero. 14851e0a012SSarah Sharp */ 14951e0a012SSarah Sharp if (!udev->bos->ss_cap) { 15025cd2882SSarah Sharp dev_info(&udev->dev, "No LPM exit latency info found, disabling LPM.\n"); 151d9b2099cSSarah Sharp return 0; 152d9b2099cSSarah Sharp } 15351e0a012SSarah Sharp 15425cd2882SSarah Sharp if (udev->bos->ss_cap->bU1devExitLat == 0 && 15525cd2882SSarah Sharp udev->bos->ss_cap->bU2DevExitLat == 0) { 15625cd2882SSarah Sharp if (udev->parent) 15725cd2882SSarah Sharp dev_info(&udev->dev, "LPM exit latency is zeroed, disabling LPM.\n"); 15825cd2882SSarah Sharp else 15925cd2882SSarah Sharp dev_info(&udev->dev, "We don't know the algorithms for LPM for this host, disabling LPM.\n"); 16025cd2882SSarah Sharp return 0; 16125cd2882SSarah Sharp } 16225cd2882SSarah Sharp 16325cd2882SSarah Sharp if (!udev->parent || udev->parent->lpm_capable) 16425cd2882SSarah Sharp return 1; 16551e0a012SSarah Sharp return 0; 16651e0a012SSarah Sharp } 16751e0a012SSarah Sharp 16851e0a012SSarah Sharp /* 16951e0a012SSarah Sharp * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from 17051e0a012SSarah Sharp * either U1 or U2. 17151e0a012SSarah Sharp */ 17251e0a012SSarah Sharp static void usb_set_lpm_mel(struct usb_device *udev, 17351e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 17451e0a012SSarah Sharp unsigned int udev_exit_latency, 17551e0a012SSarah Sharp struct usb_hub *hub, 17651e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 17751e0a012SSarah Sharp unsigned int hub_exit_latency) 17851e0a012SSarah Sharp { 17951e0a012SSarah Sharp unsigned int total_mel; 18051e0a012SSarah Sharp unsigned int device_mel; 18151e0a012SSarah Sharp unsigned int hub_mel; 18251e0a012SSarah Sharp 18351e0a012SSarah Sharp /* 18451e0a012SSarah Sharp * Calculate the time it takes to transition all links from the roothub 18551e0a012SSarah Sharp * to the parent hub into U0. The parent hub must then decode the 18651e0a012SSarah Sharp * packet (hub header decode latency) to figure out which port it was 18751e0a012SSarah Sharp * bound for. 18851e0a012SSarah Sharp * 18951e0a012SSarah Sharp * The Hub Header decode latency is expressed in 0.1us intervals (0x1 19051e0a012SSarah Sharp * means 0.1us). Multiply that by 100 to get nanoseconds. 19151e0a012SSarah Sharp */ 19251e0a012SSarah Sharp total_mel = hub_lpm_params->mel + 19351e0a012SSarah Sharp (hub->descriptor->u.ss.bHubHdrDecLat * 100); 19451e0a012SSarah Sharp 19551e0a012SSarah Sharp /* 19651e0a012SSarah Sharp * How long will it take to transition the downstream hub's port into 19751e0a012SSarah Sharp * U0? The greater of either the hub exit latency or the device exit 19851e0a012SSarah Sharp * latency. 19951e0a012SSarah Sharp * 20051e0a012SSarah Sharp * The BOS U1/U2 exit latencies are expressed in 1us intervals. 20151e0a012SSarah Sharp * Multiply that by 1000 to get nanoseconds. 20251e0a012SSarah Sharp */ 20351e0a012SSarah Sharp device_mel = udev_exit_latency * 1000; 20451e0a012SSarah Sharp hub_mel = hub_exit_latency * 1000; 20551e0a012SSarah Sharp if (device_mel > hub_mel) 20651e0a012SSarah Sharp total_mel += device_mel; 20751e0a012SSarah Sharp else 20851e0a012SSarah Sharp total_mel += hub_mel; 20951e0a012SSarah Sharp 21051e0a012SSarah Sharp udev_lpm_params->mel = total_mel; 21151e0a012SSarah Sharp } 21251e0a012SSarah Sharp 21351e0a012SSarah Sharp /* 21451e0a012SSarah Sharp * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate 21551e0a012SSarah Sharp * a transition from either U1 or U2. 21651e0a012SSarah Sharp */ 21751e0a012SSarah Sharp static void usb_set_lpm_pel(struct usb_device *udev, 21851e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 21951e0a012SSarah Sharp unsigned int udev_exit_latency, 22051e0a012SSarah Sharp struct usb_hub *hub, 22151e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 22251e0a012SSarah Sharp unsigned int hub_exit_latency, 22351e0a012SSarah Sharp unsigned int port_to_port_exit_latency) 22451e0a012SSarah Sharp { 22551e0a012SSarah Sharp unsigned int first_link_pel; 22651e0a012SSarah Sharp unsigned int hub_pel; 22751e0a012SSarah Sharp 22851e0a012SSarah Sharp /* 22951e0a012SSarah Sharp * First, the device sends an LFPS to transition the link between the 23051e0a012SSarah Sharp * device and the parent hub into U0. The exit latency is the bigger of 23151e0a012SSarah Sharp * the device exit latency or the hub exit latency. 23251e0a012SSarah Sharp */ 23351e0a012SSarah Sharp if (udev_exit_latency > hub_exit_latency) 23451e0a012SSarah Sharp first_link_pel = udev_exit_latency * 1000; 23551e0a012SSarah Sharp else 23651e0a012SSarah Sharp first_link_pel = hub_exit_latency * 1000; 23751e0a012SSarah Sharp 23851e0a012SSarah Sharp /* 23951e0a012SSarah Sharp * When the hub starts to receive the LFPS, there is a slight delay for 24051e0a012SSarah Sharp * it to figure out that one of the ports is sending an LFPS. Then it 24151e0a012SSarah Sharp * will forward the LFPS to its upstream link. The exit latency is the 24251e0a012SSarah Sharp * delay, plus the PEL that we calculated for this hub. 24351e0a012SSarah Sharp */ 24451e0a012SSarah Sharp hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel; 24551e0a012SSarah Sharp 24651e0a012SSarah Sharp /* 24751e0a012SSarah Sharp * According to figure C-7 in the USB 3.0 spec, the PEL for this device 24851e0a012SSarah Sharp * is the greater of the two exit latencies. 24951e0a012SSarah Sharp */ 25051e0a012SSarah Sharp if (first_link_pel > hub_pel) 25151e0a012SSarah Sharp udev_lpm_params->pel = first_link_pel; 25251e0a012SSarah Sharp else 25351e0a012SSarah Sharp udev_lpm_params->pel = hub_pel; 25451e0a012SSarah Sharp } 25551e0a012SSarah Sharp 25651e0a012SSarah Sharp /* 25751e0a012SSarah Sharp * Set the System Exit Latency (SEL) to indicate the total worst-case time from 25851e0a012SSarah Sharp * when a device initiates a transition to U0, until when it will receive the 25951e0a012SSarah Sharp * first packet from the host controller. 26051e0a012SSarah Sharp * 26151e0a012SSarah Sharp * Section C.1.5.1 describes the four components to this: 26251e0a012SSarah Sharp * - t1: device PEL 26351e0a012SSarah Sharp * - t2: time for the ERDY to make it from the device to the host. 26451e0a012SSarah Sharp * - t3: a host-specific delay to process the ERDY. 26551e0a012SSarah Sharp * - t4: time for the packet to make it from the host to the device. 26651e0a012SSarah Sharp * 26751e0a012SSarah Sharp * t3 is specific to both the xHCI host and the platform the host is integrated 26851e0a012SSarah Sharp * into. The Intel HW folks have said it's negligible, FIXME if a different 26951e0a012SSarah Sharp * vendor says otherwise. 27051e0a012SSarah Sharp */ 27151e0a012SSarah Sharp static void usb_set_lpm_sel(struct usb_device *udev, 27251e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params) 27351e0a012SSarah Sharp { 27451e0a012SSarah Sharp struct usb_device *parent; 27551e0a012SSarah Sharp unsigned int num_hubs; 27651e0a012SSarah Sharp unsigned int total_sel; 27751e0a012SSarah Sharp 27851e0a012SSarah Sharp /* t1 = device PEL */ 27951e0a012SSarah Sharp total_sel = udev_lpm_params->pel; 28051e0a012SSarah Sharp /* How many external hubs are in between the device & the root port. */ 28151e0a012SSarah Sharp for (parent = udev->parent, num_hubs = 0; parent->parent; 28251e0a012SSarah Sharp parent = parent->parent) 28351e0a012SSarah Sharp num_hubs++; 28451e0a012SSarah Sharp /* t2 = 2.1us + 250ns * (num_hubs - 1) */ 28551e0a012SSarah Sharp if (num_hubs > 0) 28651e0a012SSarah Sharp total_sel += 2100 + 250 * (num_hubs - 1); 28751e0a012SSarah Sharp 28851e0a012SSarah Sharp /* t4 = 250ns * num_hubs */ 28951e0a012SSarah Sharp total_sel += 250 * num_hubs; 29051e0a012SSarah Sharp 29151e0a012SSarah Sharp udev_lpm_params->sel = total_sel; 29251e0a012SSarah Sharp } 29351e0a012SSarah Sharp 29451e0a012SSarah Sharp static void usb_set_lpm_parameters(struct usb_device *udev) 29551e0a012SSarah Sharp { 29651e0a012SSarah Sharp struct usb_hub *hub; 29751e0a012SSarah Sharp unsigned int port_to_port_delay; 29851e0a012SSarah Sharp unsigned int udev_u1_del; 29951e0a012SSarah Sharp unsigned int udev_u2_del; 30051e0a012SSarah Sharp unsigned int hub_u1_del; 30151e0a012SSarah Sharp unsigned int hub_u2_del; 30251e0a012SSarah Sharp 30351e0a012SSarah Sharp if (!udev->lpm_capable || udev->speed != USB_SPEED_SUPER) 30451e0a012SSarah Sharp return; 30551e0a012SSarah Sharp 306ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 30751e0a012SSarah Sharp /* It doesn't take time to transition the roothub into U0, since it 30851e0a012SSarah Sharp * doesn't have an upstream link. 30951e0a012SSarah Sharp */ 31051e0a012SSarah Sharp if (!hub) 31151e0a012SSarah Sharp return; 31251e0a012SSarah Sharp 31351e0a012SSarah Sharp udev_u1_del = udev->bos->ss_cap->bU1devExitLat; 3144d967995SXenia Ragiadakou udev_u2_del = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat); 31551e0a012SSarah Sharp hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat; 3164d967995SXenia Ragiadakou hub_u2_del = le16_to_cpu(udev->parent->bos->ss_cap->bU2DevExitLat); 31751e0a012SSarah Sharp 31851e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del, 31951e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del); 32051e0a012SSarah Sharp 32151e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del, 32251e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del); 32351e0a012SSarah Sharp 32451e0a012SSarah Sharp /* 32551e0a012SSarah Sharp * Appendix C, section C.2.2.2, says that there is a slight delay from 32651e0a012SSarah Sharp * when the parent hub notices the downstream port is trying to 32751e0a012SSarah Sharp * transition to U0 to when the hub initiates a U0 transition on its 32851e0a012SSarah Sharp * upstream port. The section says the delays are tPort2PortU1EL and 32951e0a012SSarah Sharp * tPort2PortU2EL, but it doesn't define what they are. 33051e0a012SSarah Sharp * 33151e0a012SSarah Sharp * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking 33251e0a012SSarah Sharp * about the same delays. Use the maximum delay calculations from those 33351e0a012SSarah Sharp * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For 33451e0a012SSarah Sharp * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I 33551e0a012SSarah Sharp * assume the device exit latencies they are talking about are the hub 33651e0a012SSarah Sharp * exit latencies. 33751e0a012SSarah Sharp * 33851e0a012SSarah Sharp * What do we do if the U2 exit latency is less than the U1 exit 33951e0a012SSarah Sharp * latency? It's possible, although not likely... 34051e0a012SSarah Sharp */ 34151e0a012SSarah Sharp port_to_port_delay = 1; 34251e0a012SSarah Sharp 34351e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del, 34451e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del, 34551e0a012SSarah Sharp port_to_port_delay); 34651e0a012SSarah Sharp 34751e0a012SSarah Sharp if (hub_u2_del > hub_u1_del) 34851e0a012SSarah Sharp port_to_port_delay = 1 + hub_u2_del - hub_u1_del; 34951e0a012SSarah Sharp else 35051e0a012SSarah Sharp port_to_port_delay = 1 + hub_u1_del; 35151e0a012SSarah Sharp 35251e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del, 35351e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del, 35451e0a012SSarah Sharp port_to_port_delay); 35551e0a012SSarah Sharp 35651e0a012SSarah Sharp /* Now that we've got PEL, calculate SEL. */ 35751e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u1_params); 35851e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u2_params); 35951e0a012SSarah Sharp } 360d9b2099cSSarah Sharp 3611da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 362dbe79bbeSJohn Youn static int get_hub_descriptor(struct usb_device *hdev, void *data) 3631da177e4SLinus Torvalds { 364dbe79bbeSJohn Youn int i, ret, size; 365dbe79bbeSJohn Youn unsigned dtype; 366dbe79bbeSJohn Youn 367dbe79bbeSJohn Youn if (hub_is_superspeed(hdev)) { 368dbe79bbeSJohn Youn dtype = USB_DT_SS_HUB; 369dbe79bbeSJohn Youn size = USB_DT_SS_HUB_SIZE; 370dbe79bbeSJohn Youn } else { 371dbe79bbeSJohn Youn dtype = USB_DT_HUB; 372dbe79bbeSJohn Youn size = sizeof(struct usb_hub_descriptor); 373dbe79bbeSJohn Youn } 3741da177e4SLinus Torvalds 3751da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 3761da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3771da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 378dbe79bbeSJohn Youn dtype << 8, 0, data, size, 3791da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 3801da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 3811da177e4SLinus Torvalds return ret; 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds return -EINVAL; 3841da177e4SLinus Torvalds } 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds /* 3871da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 3881da177e4SLinus Torvalds */ 3891da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 3901da177e4SLinus Torvalds { 3911da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 3921da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 3931da177e4SLinus Torvalds } 3941da177e4SLinus Torvalds 3951da177e4SLinus Torvalds /* 3961da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 3971da177e4SLinus Torvalds */ 398ad493e5eSLan Tianyu int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature) 3991da177e4SLinus Torvalds { 4001da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4011da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 4021da177e4SLinus Torvalds NULL, 0, 1000); 4031da177e4SLinus Torvalds } 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds /* 4061da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 4071da177e4SLinus Torvalds */ 4081da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 4091da177e4SLinus Torvalds { 4101da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4111da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 4121da177e4SLinus Torvalds NULL, 0, 1000); 4131da177e4SLinus Torvalds } 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds /* 4161da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 4171da177e4SLinus Torvalds * for info about using port indicators 4181da177e4SLinus Torvalds */ 4191da177e4SLinus Torvalds static void set_port_led( 4201da177e4SLinus Torvalds struct usb_hub *hub, 4211da177e4SLinus Torvalds int port1, 4221da177e4SLinus Torvalds int selector 4231da177e4SLinus Torvalds ) 4241da177e4SLinus Torvalds { 4251da177e4SLinus Torvalds int status = set_port_feature(hub->hdev, (selector << 8) | port1, 4261da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 4271da177e4SLinus Torvalds if (status < 0) 4281da177e4SLinus Torvalds dev_dbg (hub->intfdev, 4291da177e4SLinus Torvalds "port %d indicator %s status %d\n", 4301da177e4SLinus Torvalds port1, 4311da177e4SLinus Torvalds ({ char *s; switch (selector) { 4321da177e4SLinus Torvalds case HUB_LED_AMBER: s = "amber"; break; 4331da177e4SLinus Torvalds case HUB_LED_GREEN: s = "green"; break; 4341da177e4SLinus Torvalds case HUB_LED_OFF: s = "off"; break; 4351da177e4SLinus Torvalds case HUB_LED_AUTO: s = "auto"; break; 4361da177e4SLinus Torvalds default: s = "??"; break; 4372b84f92bSJoe Perches } s; }), 4381da177e4SLinus Torvalds status); 4391da177e4SLinus Torvalds } 4401da177e4SLinus Torvalds 4411da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 4421da177e4SLinus Torvalds 443c4028958SDavid Howells static void led_work (struct work_struct *work) 4441da177e4SLinus Torvalds { 445c4028958SDavid Howells struct usb_hub *hub = 446c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 4471da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4481da177e4SLinus Torvalds unsigned i; 4491da177e4SLinus Torvalds unsigned changed = 0; 4501da177e4SLinus Torvalds int cursor = -1; 4511da177e4SLinus Torvalds 4521da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 4531da177e4SLinus Torvalds return; 4541da177e4SLinus Torvalds 4553bbc47d8SKrzysztof Mazur for (i = 0; i < hdev->maxchild; i++) { 4561da177e4SLinus Torvalds unsigned selector, mode; 4571da177e4SLinus Torvalds 4581da177e4SLinus Torvalds /* 30%-50% duty cycle */ 4591da177e4SLinus Torvalds 4601da177e4SLinus Torvalds switch (hub->indicator[i]) { 4611da177e4SLinus Torvalds /* cycle marker */ 4621da177e4SLinus Torvalds case INDICATOR_CYCLE: 4631da177e4SLinus Torvalds cursor = i; 4641da177e4SLinus Torvalds selector = HUB_LED_AUTO; 4651da177e4SLinus Torvalds mode = INDICATOR_AUTO; 4661da177e4SLinus Torvalds break; 4671da177e4SLinus Torvalds /* blinking green = sw attention */ 4681da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 4691da177e4SLinus Torvalds selector = HUB_LED_GREEN; 4701da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 4711da177e4SLinus Torvalds break; 4721da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 4731da177e4SLinus Torvalds selector = HUB_LED_OFF; 4741da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 4751da177e4SLinus Torvalds break; 4761da177e4SLinus Torvalds /* blinking amber = hw attention */ 4771da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 4781da177e4SLinus Torvalds selector = HUB_LED_AMBER; 4791da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 4801da177e4SLinus Torvalds break; 4811da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 4821da177e4SLinus Torvalds selector = HUB_LED_OFF; 4831da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 4841da177e4SLinus Torvalds break; 4851da177e4SLinus Torvalds /* blink green/amber = reserved */ 4861da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 4871da177e4SLinus Torvalds selector = HUB_LED_GREEN; 4881da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 4891da177e4SLinus Torvalds break; 4901da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 4911da177e4SLinus Torvalds selector = HUB_LED_AMBER; 4921da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 4931da177e4SLinus Torvalds break; 4941da177e4SLinus Torvalds default: 4951da177e4SLinus Torvalds continue; 4961da177e4SLinus Torvalds } 4971da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 4981da177e4SLinus Torvalds changed = 1; 4991da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 5001da177e4SLinus Torvalds hub->indicator[i] = mode; 5011da177e4SLinus Torvalds } 5021da177e4SLinus Torvalds if (!changed && blinkenlights) { 5031da177e4SLinus Torvalds cursor++; 5043bbc47d8SKrzysztof Mazur cursor %= hdev->maxchild; 5051da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 5061da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 5071da177e4SLinus Torvalds changed++; 5081da177e4SLinus Torvalds } 5091da177e4SLinus Torvalds if (changed) 51022f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 51122f6a0f0SShaibal Dutta &hub->leds, LED_CYCLE_PERIOD); 5121da177e4SLinus Torvalds } 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 5151da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 5161da177e4SLinus Torvalds #define USB_STS_RETRIES 5 5171da177e4SLinus Torvalds 5181da177e4SLinus Torvalds /* 5191da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 5201da177e4SLinus Torvalds */ 5211da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 5221da177e4SLinus Torvalds struct usb_hub_status *data) 5231da177e4SLinus Torvalds { 5241da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5251da177e4SLinus Torvalds 5263824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 5273824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 5281da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 5291da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 5301da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 5311da177e4SLinus Torvalds } 5321da177e4SLinus Torvalds return status; 5331da177e4SLinus Torvalds } 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds /* 5361da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 5371da177e4SLinus Torvalds */ 5381da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 5391da177e4SLinus Torvalds struct usb_port_status *data) 5401da177e4SLinus Torvalds { 5411da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5421da177e4SLinus Torvalds 5433824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 5443824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 5451da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 5461da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 5471da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 5481da177e4SLinus Torvalds } 5491da177e4SLinus Torvalds return status; 5501da177e4SLinus Torvalds } 5511da177e4SLinus Torvalds 5523eb14915SAlan Stern static int hub_port_status(struct usb_hub *hub, int port1, 5533eb14915SAlan Stern u16 *status, u16 *change) 5543eb14915SAlan Stern { 5553eb14915SAlan Stern int ret; 5563eb14915SAlan Stern 5573eb14915SAlan Stern mutex_lock(&hub->status_mutex); 5583eb14915SAlan Stern ret = get_port_status(hub->hdev, port1, &hub->status->port); 5593eb14915SAlan Stern if (ret < 4) { 560e9e88fb7SAlan Stern if (ret != -ENODEV) 5613eb14915SAlan Stern dev_err(hub->intfdev, 5623eb14915SAlan Stern "%s failed (err = %d)\n", __func__, ret); 5633eb14915SAlan Stern if (ret >= 0) 5643eb14915SAlan Stern ret = -EIO; 5653eb14915SAlan Stern } else { 5663eb14915SAlan Stern *status = le16_to_cpu(hub->status->port.wPortStatus); 5673eb14915SAlan Stern *change = le16_to_cpu(hub->status->port.wPortChange); 568dbe79bbeSJohn Youn 5693eb14915SAlan Stern ret = 0; 5703eb14915SAlan Stern } 5713eb14915SAlan Stern mutex_unlock(&hub->status_mutex); 5723eb14915SAlan Stern return ret; 5733eb14915SAlan Stern } 5743eb14915SAlan Stern 5751da177e4SLinus Torvalds static void kick_khubd(struct usb_hub *hub) 5761da177e4SLinus Torvalds { 5771da177e4SLinus Torvalds unsigned long flags; 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds spin_lock_irqsave(&hub_event_lock, flags); 5802e2c5eeaSRoel Kluin if (!hub->disconnected && list_empty(&hub->event_list)) { 5811da177e4SLinus Torvalds list_add_tail(&hub->event_list, &hub_event_list); 5828e4ceb38SAlan Stern 5838e4ceb38SAlan Stern /* Suppress autosuspend until khubd runs */ 5848e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 5858e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 5861da177e4SLinus Torvalds wake_up(&khubd_wait); 5871da177e4SLinus Torvalds } 5881da177e4SLinus Torvalds spin_unlock_irqrestore(&hub_event_lock, flags); 5891da177e4SLinus Torvalds } 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds void usb_kick_khubd(struct usb_device *hdev) 5921da177e4SLinus Torvalds { 593ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 59425118084SAlan Stern 59525118084SAlan Stern if (hub) 59625118084SAlan Stern kick_khubd(hub); 5971da177e4SLinus Torvalds } 5981da177e4SLinus Torvalds 5994ee823b8SSarah Sharp /* 6004ee823b8SSarah Sharp * Let the USB core know that a USB 3.0 device has sent a Function Wake Device 6014ee823b8SSarah Sharp * Notification, which indicates it had initiated remote wakeup. 6024ee823b8SSarah Sharp * 6034ee823b8SSarah Sharp * USB 3.0 hubs do not report the port link state change from U3 to U0 when the 6044ee823b8SSarah Sharp * device initiates resume, so the USB core will not receive notice of the 6054ee823b8SSarah Sharp * resume through the normal hub interrupt URB. 6064ee823b8SSarah Sharp */ 6074ee823b8SSarah Sharp void usb_wakeup_notification(struct usb_device *hdev, 6084ee823b8SSarah Sharp unsigned int portnum) 6094ee823b8SSarah Sharp { 6104ee823b8SSarah Sharp struct usb_hub *hub; 6114ee823b8SSarah Sharp 6124ee823b8SSarah Sharp if (!hdev) 6134ee823b8SSarah Sharp return; 6144ee823b8SSarah Sharp 615ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(hdev); 6164ee823b8SSarah Sharp if (hub) { 6174ee823b8SSarah Sharp set_bit(portnum, hub->wakeup_bits); 6184ee823b8SSarah Sharp kick_khubd(hub); 6194ee823b8SSarah Sharp } 6204ee823b8SSarah Sharp } 6214ee823b8SSarah Sharp EXPORT_SYMBOL_GPL(usb_wakeup_notification); 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 6247d12e780SDavid Howells static void hub_irq(struct urb *urb) 6251da177e4SLinus Torvalds { 626ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 627e015268dSAlan Stern int status = urb->status; 62871d2718fSRoel Kluin unsigned i; 6291da177e4SLinus Torvalds unsigned long bits; 6301da177e4SLinus Torvalds 631e015268dSAlan Stern switch (status) { 6321da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 6331da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 6341da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 6351da177e4SLinus Torvalds return; 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds default: /* presumably an error */ 6381da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 639e015268dSAlan Stern dev_dbg (hub->intfdev, "transfer --> %d\n", status); 6401da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 6411da177e4SLinus Torvalds goto resubmit; 642e015268dSAlan Stern hub->error = status; 6431da177e4SLinus Torvalds /* FALL THROUGH */ 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds /* let khubd handle things */ 6461da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 6471da177e4SLinus Torvalds bits = 0; 6481da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 6491da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 6501da177e4SLinus Torvalds << (i*8); 6511da177e4SLinus Torvalds hub->event_bits[0] = bits; 6521da177e4SLinus Torvalds break; 6531da177e4SLinus Torvalds } 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds hub->nerrors = 0; 6561da177e4SLinus Torvalds 6571da177e4SLinus Torvalds /* Something happened, let khubd figure it out */ 6581da177e4SLinus Torvalds kick_khubd(hub); 6591da177e4SLinus Torvalds 6601da177e4SLinus Torvalds resubmit: 6611da177e4SLinus Torvalds if (hub->quiescing) 6621da177e4SLinus Torvalds return; 6631da177e4SLinus Torvalds 6641da177e4SLinus Torvalds if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 6651da177e4SLinus Torvalds && status != -ENODEV && status != -EPERM) 6661da177e4SLinus Torvalds dev_err (hub->intfdev, "resubmit --> %d\n", status); 6671da177e4SLinus Torvalds } 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 6701da177e4SLinus Torvalds static inline int 6711da177e4SLinus Torvalds hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) 6721da177e4SLinus Torvalds { 6732c7b871bSWilliam Gulland /* Need to clear both directions for control ep */ 6742c7b871bSWilliam Gulland if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) == 6752c7b871bSWilliam Gulland USB_ENDPOINT_XFER_CONTROL) { 6762c7b871bSWilliam Gulland int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 6772c7b871bSWilliam Gulland HUB_CLEAR_TT_BUFFER, USB_RT_PORT, 6782c7b871bSWilliam Gulland devinfo ^ 0x8000, tt, NULL, 0, 1000); 6792c7b871bSWilliam Gulland if (status) 6802c7b871bSWilliam Gulland return status; 6812c7b871bSWilliam Gulland } 682c2f6595fSAlan Stern return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 6831da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 6841da177e4SLinus Torvalds tt, NULL, 0, 1000); 6851da177e4SLinus Torvalds } 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds /* 6881da177e4SLinus Torvalds * enumeration blocks khubd for a long time. we use keventd instead, since 6891da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 6901da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 6911da177e4SLinus Torvalds * both can talk to the same hub concurrently. 6921da177e4SLinus Torvalds */ 693cb88a1b8SAlan Stern static void hub_tt_work(struct work_struct *work) 6941da177e4SLinus Torvalds { 695c4028958SDavid Howells struct usb_hub *hub = 696cb88a1b8SAlan Stern container_of(work, struct usb_hub, tt.clear_work); 6971da177e4SLinus Torvalds unsigned long flags; 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 7003b6054daSOctavian Purdila while (!list_empty(&hub->tt.clear_list)) { 701d0f830d3SH Hartley Sweeten struct list_head *next; 7021da177e4SLinus Torvalds struct usb_tt_clear *clear; 7031da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 704cb88a1b8SAlan Stern const struct hc_driver *drv; 7051da177e4SLinus Torvalds int status; 7061da177e4SLinus Torvalds 707d0f830d3SH Hartley Sweeten next = hub->tt.clear_list.next; 708d0f830d3SH Hartley Sweeten clear = list_entry (next, struct usb_tt_clear, clear_list); 7091da177e4SLinus Torvalds list_del (&clear->clear_list); 7101da177e4SLinus Torvalds 7111da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 7121da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 7131da177e4SLinus Torvalds status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 714e9e88fb7SAlan Stern if (status && status != -ENODEV) 7151da177e4SLinus Torvalds dev_err (&hdev->dev, 7161da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 7171da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 718cb88a1b8SAlan Stern 719cb88a1b8SAlan Stern /* Tell the HCD, even if the operation failed */ 720cb88a1b8SAlan Stern drv = clear->hcd->driver; 721cb88a1b8SAlan Stern if (drv->clear_tt_buffer_complete) 722cb88a1b8SAlan Stern (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); 723cb88a1b8SAlan Stern 7241da177e4SLinus Torvalds kfree(clear); 725cb88a1b8SAlan Stern spin_lock_irqsave(&hub->tt.lock, flags); 7261da177e4SLinus Torvalds } 7271da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 7281da177e4SLinus Torvalds } 7291da177e4SLinus Torvalds 7301da177e4SLinus Torvalds /** 731971fcd49SLan Tianyu * usb_hub_set_port_power - control hub port's power state 73241341261SMathias Nyman * @hdev: USB device belonging to the usb hub 73341341261SMathias Nyman * @hub: target hub 734971fcd49SLan Tianyu * @port1: port index 735971fcd49SLan Tianyu * @set: expected status 736971fcd49SLan Tianyu * 737971fcd49SLan Tianyu * call this function to control port's power via setting or 738971fcd49SLan Tianyu * clearing the port's PORT_POWER feature. 739626f090cSYacine Belkadi * 740626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 741971fcd49SLan Tianyu */ 74241341261SMathias Nyman int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, 74341341261SMathias Nyman int port1, bool set) 744971fcd49SLan Tianyu { 745971fcd49SLan Tianyu int ret; 746ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[port1 - 1]; 747971fcd49SLan Tianyu 748971fcd49SLan Tianyu if (set) 749971fcd49SLan Tianyu ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 750971fcd49SLan Tianyu else 751ad493e5eSLan Tianyu ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 752ad493e5eSLan Tianyu 753ad493e5eSLan Tianyu if (!ret) 754ad493e5eSLan Tianyu port_dev->power_is_on = set; 755971fcd49SLan Tianyu return ret; 756971fcd49SLan Tianyu } 757971fcd49SLan Tianyu 758971fcd49SLan Tianyu /** 759cb88a1b8SAlan Stern * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub 760cb88a1b8SAlan Stern * @urb: an URB associated with the failed or incomplete split transaction 7611da177e4SLinus Torvalds * 7621da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 7631da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 7641da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 7651da177e4SLinus Torvalds * interrupt context. 7661da177e4SLinus Torvalds * 7671da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 7681da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 769626f090cSYacine Belkadi * 770626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 7711da177e4SLinus Torvalds */ 772cb88a1b8SAlan Stern int usb_hub_clear_tt_buffer(struct urb *urb) 7731da177e4SLinus Torvalds { 774cb88a1b8SAlan Stern struct usb_device *udev = urb->dev; 775cb88a1b8SAlan Stern int pipe = urb->pipe; 7761da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 7771da177e4SLinus Torvalds unsigned long flags; 7781da177e4SLinus Torvalds struct usb_tt_clear *clear; 7791da177e4SLinus Torvalds 7801da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 7811da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 7821da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 7831da177e4SLinus Torvalds */ 78454e6ecb2SChristoph Lameter if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { 7851da177e4SLinus Torvalds dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 7861da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 787cb88a1b8SAlan Stern return -ENOMEM; 7881da177e4SLinus Torvalds } 7891da177e4SLinus Torvalds 7901da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 7911da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 7921da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 7931da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 7941da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol (pipe) 7951da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 7961da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 7971da177e4SLinus Torvalds if (usb_pipein (pipe)) 7981da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 7991da177e4SLinus Torvalds 800cb88a1b8SAlan Stern /* info for completion callback */ 801cb88a1b8SAlan Stern clear->hcd = bus_to_hcd(udev->bus); 802cb88a1b8SAlan Stern clear->ep = urb->ep; 803cb88a1b8SAlan Stern 8041da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 8051da177e4SLinus Torvalds spin_lock_irqsave (&tt->lock, flags); 8061da177e4SLinus Torvalds list_add_tail (&clear->clear_list, &tt->clear_list); 807cb88a1b8SAlan Stern schedule_work(&tt->clear_work); 8081da177e4SLinus Torvalds spin_unlock_irqrestore (&tt->lock, flags); 809cb88a1b8SAlan Stern return 0; 8101da177e4SLinus Torvalds } 811cb88a1b8SAlan Stern EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); 8121da177e4SLinus Torvalds 8138520f380SAlan Stern /* If do_delay is false, return the number of milliseconds the caller 8148520f380SAlan Stern * needs to delay. 8158520f380SAlan Stern */ 8168520f380SAlan Stern static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) 8171da177e4SLinus Torvalds { 8181da177e4SLinus Torvalds int port1; 819b789696aSDavid Brownell unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 8208520f380SAlan Stern unsigned delay; 8214489a571SAlan Stern u16 wHubCharacteristics = 8224489a571SAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 8231da177e4SLinus Torvalds 8244489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 8254489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 8264489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 8274489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 8284489a571SAlan Stern * unless we send these messages to the hub. 8294489a571SAlan Stern */ 8304489a571SAlan Stern if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) 8311da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 8324489a571SAlan Stern else 8334489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 8344489a571SAlan Stern "non-switchable hub\n"); 8353bbc47d8SKrzysztof Mazur for (port1 = 1; port1 <= hub->hdev->maxchild; port1++) 836ad493e5eSLan Tianyu if (hub->ports[port1 - 1]->power_is_on) 8374489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 838ad493e5eSLan Tianyu else 839ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 840ad493e5eSLan Tianyu USB_PORT_FEAT_POWER); 8411da177e4SLinus Torvalds 842b789696aSDavid Brownell /* Wait at least 100 msec for power to become stable */ 8438520f380SAlan Stern delay = max(pgood_delay, (unsigned) 100); 8448520f380SAlan Stern if (do_delay) 8458520f380SAlan Stern msleep(delay); 8468520f380SAlan Stern return delay; 8471da177e4SLinus Torvalds } 8481da177e4SLinus Torvalds 8491da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 8501da177e4SLinus Torvalds u16 *status, u16 *change) 8511da177e4SLinus Torvalds { 8521da177e4SLinus Torvalds int ret; 8531da177e4SLinus Torvalds 854db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 8551da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 856e9e88fb7SAlan Stern if (ret < 0) { 857e9e88fb7SAlan Stern if (ret != -ENODEV) 8581da177e4SLinus Torvalds dev_err(hub->intfdev, 859441b62c1SHarvey Harrison "%s failed (err = %d)\n", __func__, ret); 860e9e88fb7SAlan Stern } else { 8611da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 8621da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 8631da177e4SLinus Torvalds ret = 0; 8641da177e4SLinus Torvalds } 865db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 8661da177e4SLinus Torvalds return ret; 8671da177e4SLinus Torvalds } 8681da177e4SLinus Torvalds 86941e7e056SSarah Sharp static int hub_set_port_link_state(struct usb_hub *hub, int port1, 87041e7e056SSarah Sharp unsigned int link_status) 87141e7e056SSarah Sharp { 87241e7e056SSarah Sharp return set_port_feature(hub->hdev, 87341e7e056SSarah Sharp port1 | (link_status << 3), 87441e7e056SSarah Sharp USB_PORT_FEAT_LINK_STATE); 87541e7e056SSarah Sharp } 87641e7e056SSarah Sharp 87741e7e056SSarah Sharp /* 87841e7e056SSarah Sharp * If USB 3.0 ports are placed into the Disabled state, they will no longer 87941e7e056SSarah Sharp * detect any device connects or disconnects. This is generally not what the 88041e7e056SSarah Sharp * USB core wants, since it expects a disabled port to produce a port status 88141e7e056SSarah Sharp * change event when a new device connects. 88241e7e056SSarah Sharp * 88341e7e056SSarah Sharp * Instead, set the link state to Disabled, wait for the link to settle into 88441e7e056SSarah Sharp * that state, clear any change bits, and then put the port into the RxDetect 88541e7e056SSarah Sharp * state. 88641e7e056SSarah Sharp */ 88741e7e056SSarah Sharp static int hub_usb3_port_disable(struct usb_hub *hub, int port1) 88841e7e056SSarah Sharp { 88941e7e056SSarah Sharp int ret; 89041e7e056SSarah Sharp int total_time; 89141e7e056SSarah Sharp u16 portchange, portstatus; 89241e7e056SSarah Sharp 89341e7e056SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 89441e7e056SSarah Sharp return -EINVAL; 89541e7e056SSarah Sharp 89641e7e056SSarah Sharp ret = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_SS_DISABLED); 897e9e88fb7SAlan Stern if (ret) 89841e7e056SSarah Sharp return ret; 89941e7e056SSarah Sharp 90041e7e056SSarah Sharp /* Wait for the link to enter the disabled state. */ 90141e7e056SSarah Sharp for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 90241e7e056SSarah Sharp ret = hub_port_status(hub, port1, &portstatus, &portchange); 90341e7e056SSarah Sharp if (ret < 0) 90441e7e056SSarah Sharp return ret; 90541e7e056SSarah Sharp 90641e7e056SSarah Sharp if ((portstatus & USB_PORT_STAT_LINK_STATE) == 90741e7e056SSarah Sharp USB_SS_PORT_LS_SS_DISABLED) 90841e7e056SSarah Sharp break; 90941e7e056SSarah Sharp if (total_time >= HUB_DEBOUNCE_TIMEOUT) 91041e7e056SSarah Sharp break; 91141e7e056SSarah Sharp msleep(HUB_DEBOUNCE_STEP); 91241e7e056SSarah Sharp } 91341e7e056SSarah Sharp if (total_time >= HUB_DEBOUNCE_TIMEOUT) 91441e7e056SSarah Sharp dev_warn(hub->intfdev, "Could not disable port %d after %d ms\n", 91541e7e056SSarah Sharp port1, total_time); 91641e7e056SSarah Sharp 91741e7e056SSarah Sharp return hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_RX_DETECT); 91841e7e056SSarah Sharp } 91941e7e056SSarah Sharp 9208b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 9218b28c752SAlan Stern { 9228b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 9230458d5b4SAlan Stern int ret = 0; 9248b28c752SAlan Stern 925ff823c79SLan Tianyu if (hub->ports[port1 - 1]->child && set_state) 926ff823c79SLan Tianyu usb_set_device_state(hub->ports[port1 - 1]->child, 9278b28c752SAlan Stern USB_STATE_NOTATTACHED); 92841e7e056SSarah Sharp if (!hub->error) { 92941e7e056SSarah Sharp if (hub_is_superspeed(hub->hdev)) 93041e7e056SSarah Sharp ret = hub_usb3_port_disable(hub, port1); 93141e7e056SSarah Sharp else 932ad493e5eSLan Tianyu ret = usb_clear_port_feature(hdev, port1, 93341e7e056SSarah Sharp USB_PORT_FEAT_ENABLE); 93441e7e056SSarah Sharp } 935e9e88fb7SAlan Stern if (ret && ret != -ENODEV) 9368b28c752SAlan Stern dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 9378b28c752SAlan Stern port1, ret); 9388b28c752SAlan Stern return ret; 9398b28c752SAlan Stern } 9408b28c752SAlan Stern 9410458d5b4SAlan Stern /* 9426d42fcdbSJustin P. Mattock * Disable a port and mark a logical connect-change event, so that some 9430458d5b4SAlan Stern * time later khubd will disconnect() any existing usb_device on the port 9440458d5b4SAlan Stern * and will re-enumerate if there actually is a device attached. 9450458d5b4SAlan Stern */ 9460458d5b4SAlan Stern static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 9477d069b7dSAlan Stern { 9480458d5b4SAlan Stern dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 9490458d5b4SAlan Stern hub_port_disable(hub, port1, 1); 9500458d5b4SAlan Stern 9510458d5b4SAlan Stern /* FIXME let caller ask to power down the port: 9520458d5b4SAlan Stern * - some devices won't enumerate without a VBUS power cycle 9530458d5b4SAlan Stern * - SRP saves power that way 9540458d5b4SAlan Stern * - ... new call, TBD ... 9550458d5b4SAlan Stern * That's easy if this hub can switch power per-port, and 9560458d5b4SAlan Stern * khubd reactivates the port later (timer, SRP, etc). 9570458d5b4SAlan Stern * Powerdown must be optional, because of reset/DFU. 9580458d5b4SAlan Stern */ 9590458d5b4SAlan Stern 9600458d5b4SAlan Stern set_bit(port1, hub->change_bits); 9610458d5b4SAlan Stern kick_khubd(hub); 9620458d5b4SAlan Stern } 9630458d5b4SAlan Stern 964253e0572SAlan Stern /** 965253e0572SAlan Stern * usb_remove_device - disable a device's port on its parent hub 966253e0572SAlan Stern * @udev: device to be disabled and removed 967253e0572SAlan Stern * Context: @udev locked, must be able to sleep. 968253e0572SAlan Stern * 969253e0572SAlan Stern * After @udev's port has been disabled, khubd is notified and it will 970253e0572SAlan Stern * see that the device has been disconnected. When the device is 971253e0572SAlan Stern * physically unplugged and something is plugged in, the events will 972253e0572SAlan Stern * be received and processed normally. 973626f090cSYacine Belkadi * 974626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 975253e0572SAlan Stern */ 976253e0572SAlan Stern int usb_remove_device(struct usb_device *udev) 977253e0572SAlan Stern { 978253e0572SAlan Stern struct usb_hub *hub; 979253e0572SAlan Stern struct usb_interface *intf; 980253e0572SAlan Stern 981253e0572SAlan Stern if (!udev->parent) /* Can't remove a root hub */ 982253e0572SAlan Stern return -EINVAL; 983ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 984253e0572SAlan Stern intf = to_usb_interface(hub->intfdev); 985253e0572SAlan Stern 986253e0572SAlan Stern usb_autopm_get_interface(intf); 987253e0572SAlan Stern set_bit(udev->portnum, hub->removed_bits); 988253e0572SAlan Stern hub_port_logical_disconnect(hub, udev->portnum); 989253e0572SAlan Stern usb_autopm_put_interface(intf); 990253e0572SAlan Stern return 0; 991253e0572SAlan Stern } 992253e0572SAlan Stern 9936ee0b270SAlan Stern enum hub_activation_type { 9948e4ceb38SAlan Stern HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ 9958520f380SAlan Stern HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, 9966ee0b270SAlan Stern }; 9975e6effaeSAlan Stern 9988520f380SAlan Stern static void hub_init_func2(struct work_struct *ws); 9998520f380SAlan Stern static void hub_init_func3(struct work_struct *ws); 10008520f380SAlan Stern 1001f2835219SAlan Stern static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) 10025e6effaeSAlan Stern { 10035e6effaeSAlan Stern struct usb_device *hdev = hub->hdev; 1004653a39d1SSarah Sharp struct usb_hcd *hcd; 1005653a39d1SSarah Sharp int ret; 10065e6effaeSAlan Stern int port1; 1007f2835219SAlan Stern int status; 1008948fea37SAlan Stern bool need_debounce_delay = false; 10098520f380SAlan Stern unsigned delay; 10108520f380SAlan Stern 10118520f380SAlan Stern /* Continue a partial initialization */ 10128520f380SAlan Stern if (type == HUB_INIT2) 10138520f380SAlan Stern goto init2; 10148520f380SAlan Stern if (type == HUB_INIT3) 10158520f380SAlan Stern goto init3; 10165e6effaeSAlan Stern 1017a45aa3b3SElric Fu /* The superspeed hub except for root hub has to use Hub Depth 1018a45aa3b3SElric Fu * value as an offset into the route string to locate the bits 1019a45aa3b3SElric Fu * it uses to determine the downstream port number. So hub driver 1020a45aa3b3SElric Fu * should send a set hub depth request to superspeed hub after 1021a45aa3b3SElric Fu * the superspeed hub is set configuration in initialization or 1022a45aa3b3SElric Fu * reset procedure. 1023a45aa3b3SElric Fu * 1024a45aa3b3SElric Fu * After a resume, port power should still be on. 1025f2835219SAlan Stern * For any other type of activation, turn it on. 1026f2835219SAlan Stern */ 10278520f380SAlan Stern if (type != HUB_RESUME) { 1028a45aa3b3SElric Fu if (hdev->parent && hub_is_superspeed(hdev)) { 1029a45aa3b3SElric Fu ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1030a45aa3b3SElric Fu HUB_SET_DEPTH, USB_RT_HUB, 1031a45aa3b3SElric Fu hdev->level - 1, 0, NULL, 0, 1032a45aa3b3SElric Fu USB_CTRL_SET_TIMEOUT); 1033a45aa3b3SElric Fu if (ret < 0) 1034a45aa3b3SElric Fu dev_err(hub->intfdev, 1035a45aa3b3SElric Fu "set hub depth failed\n"); 1036a45aa3b3SElric Fu } 10378520f380SAlan Stern 10388520f380SAlan Stern /* Speed up system boot by using a delayed_work for the 10398520f380SAlan Stern * hub's initial power-up delays. This is pretty awkward 10408520f380SAlan Stern * and the implementation looks like a home-brewed sort of 10418520f380SAlan Stern * setjmp/longjmp, but it saves at least 100 ms for each 10428520f380SAlan Stern * root hub (assuming usbcore is compiled into the kernel 10438520f380SAlan Stern * rather than as a module). It adds up. 10448520f380SAlan Stern * 10458520f380SAlan Stern * This can't be done for HUB_RESUME or HUB_RESET_RESUME 10468520f380SAlan Stern * because for those activation types the ports have to be 10478520f380SAlan Stern * operational when we return. In theory this could be done 10488520f380SAlan Stern * for HUB_POST_RESET, but it's easier not to. 10498520f380SAlan Stern */ 10508520f380SAlan Stern if (type == HUB_INIT) { 10518520f380SAlan Stern delay = hub_power_on(hub, false); 10528520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); 105322f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 105422f6a0f0SShaibal Dutta &hub->init_work, 10558520f380SAlan Stern msecs_to_jiffies(delay)); 105661fbeba1SAlan Stern 105761fbeba1SAlan Stern /* Suppress autosuspend until init is done */ 10588e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 10598e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 10608520f380SAlan Stern return; /* Continues at init2: below */ 1061653a39d1SSarah Sharp } else if (type == HUB_RESET_RESUME) { 1062653a39d1SSarah Sharp /* The internal host controller state for the hub device 1063653a39d1SSarah Sharp * may be gone after a host power loss on system resume. 1064653a39d1SSarah Sharp * Update the device's info so the HW knows it's a hub. 1065653a39d1SSarah Sharp */ 1066653a39d1SSarah Sharp hcd = bus_to_hcd(hdev->bus); 1067653a39d1SSarah Sharp if (hcd->driver->update_hub_device) { 1068653a39d1SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1069653a39d1SSarah Sharp &hub->tt, GFP_NOIO); 1070653a39d1SSarah Sharp if (ret < 0) { 1071653a39d1SSarah Sharp dev_err(hub->intfdev, "Host not " 1072653a39d1SSarah Sharp "accepting hub info " 1073653a39d1SSarah Sharp "update.\n"); 1074653a39d1SSarah Sharp dev_err(hub->intfdev, "LS/FS devices " 1075653a39d1SSarah Sharp "and hubs may not work " 1076653a39d1SSarah Sharp "under this hub\n."); 1077653a39d1SSarah Sharp } 1078653a39d1SSarah Sharp } 1079653a39d1SSarah Sharp hub_power_on(hub, true); 10808520f380SAlan Stern } else { 10818520f380SAlan Stern hub_power_on(hub, true); 10828520f380SAlan Stern } 10838520f380SAlan Stern } 10848520f380SAlan Stern init2: 1085f2835219SAlan Stern 10866ee0b270SAlan Stern /* Check each port and set hub->change_bits to let khubd know 10876ee0b270SAlan Stern * which ports need attention. 10885e6effaeSAlan Stern */ 10895e6effaeSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 1090ff823c79SLan Tianyu struct usb_device *udev = hub->ports[port1 - 1]->child; 10915e6effaeSAlan Stern u16 portstatus, portchange; 10925e6effaeSAlan Stern 10936ee0b270SAlan Stern portstatus = portchange = 0; 10946ee0b270SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 10956ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 10966ee0b270SAlan Stern dev_dbg(hub->intfdev, 10976ee0b270SAlan Stern "port %d: status %04x change %04x\n", 10986ee0b270SAlan Stern port1, portstatus, portchange); 10995e6effaeSAlan Stern 11006ee0b270SAlan Stern /* After anything other than HUB_RESUME (i.e., initialization 11016ee0b270SAlan Stern * or any sort of reset), every port should be disabled. 11026ee0b270SAlan Stern * Unconnected ports should likewise be disabled (paranoia), 11036ee0b270SAlan Stern * and so should ports for which we have no usb_device. 11045e6effaeSAlan Stern */ 11056ee0b270SAlan Stern if ((portstatus & USB_PORT_STAT_ENABLE) && ( 11066ee0b270SAlan Stern type != HUB_RESUME || 11076ee0b270SAlan Stern !(portstatus & USB_PORT_STAT_CONNECTION) || 11086ee0b270SAlan Stern !udev || 11096ee0b270SAlan Stern udev->state == USB_STATE_NOTATTACHED)) { 11109f0a6cd3SAndiry Xu /* 11119f0a6cd3SAndiry Xu * USB3 protocol ports will automatically transition 11129f0a6cd3SAndiry Xu * to Enabled state when detect an USB3.0 device attach. 1113fd1ac4cfSDan Williams * Do not disable USB3 protocol ports, just pretend 1114fd1ac4cfSDan Williams * power was lost 11159f0a6cd3SAndiry Xu */ 1116fd1ac4cfSDan Williams portstatus &= ~USB_PORT_STAT_ENABLE; 1117fd1ac4cfSDan Williams if (!hub_is_superspeed(hdev)) 1118ad493e5eSLan Tianyu usb_clear_port_feature(hdev, port1, 11199f0a6cd3SAndiry Xu USB_PORT_FEAT_ENABLE); 11209f0a6cd3SAndiry Xu } 11216ee0b270SAlan Stern 1122948fea37SAlan Stern /* Clear status-change flags; we'll debounce later */ 1123948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) { 1124948fea37SAlan Stern need_debounce_delay = true; 1125ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1126948fea37SAlan Stern USB_PORT_FEAT_C_CONNECTION); 1127948fea37SAlan Stern } 1128948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) { 1129948fea37SAlan Stern need_debounce_delay = true; 1130ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1131948fea37SAlan Stern USB_PORT_FEAT_C_ENABLE); 1132948fea37SAlan Stern } 1133e92aee33SJulius Werner if (portchange & USB_PORT_STAT_C_RESET) { 1134e92aee33SJulius Werner need_debounce_delay = true; 1135e92aee33SJulius Werner usb_clear_port_feature(hub->hdev, port1, 1136e92aee33SJulius Werner USB_PORT_FEAT_C_RESET); 1137e92aee33SJulius Werner } 113879c3dd81SDon Zickus if ((portchange & USB_PORT_STAT_C_BH_RESET) && 113979c3dd81SDon Zickus hub_is_superspeed(hub->hdev)) { 114079c3dd81SDon Zickus need_debounce_delay = true; 1141ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 114279c3dd81SDon Zickus USB_PORT_FEAT_C_BH_PORT_RESET); 114379c3dd81SDon Zickus } 1144253e0572SAlan Stern /* We can forget about a "removed" device when there's a 1145253e0572SAlan Stern * physical disconnect or the connect status changes. 1146253e0572SAlan Stern */ 1147253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 1148253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 1149253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 1150253e0572SAlan Stern 11516ee0b270SAlan Stern if (!udev || udev->state == USB_STATE_NOTATTACHED) { 11526ee0b270SAlan Stern /* Tell khubd to disconnect the device or 11536ee0b270SAlan Stern * check for a new connection 11546ee0b270SAlan Stern */ 115508d1dec6SShen Guang if (udev || (portstatus & USB_PORT_STAT_CONNECTION) || 115608d1dec6SShen Guang (portstatus & USB_PORT_STAT_OVERCURRENT)) 11576ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11586ee0b270SAlan Stern 11596ee0b270SAlan Stern } else if (portstatus & USB_PORT_STAT_ENABLE) { 116072937e1eSSarah Sharp bool port_resumed = (portstatus & 116172937e1eSSarah Sharp USB_PORT_STAT_LINK_STATE) == 116272937e1eSSarah Sharp USB_SS_PORT_LS_U0; 11636ee0b270SAlan Stern /* The power session apparently survived the resume. 11646ee0b270SAlan Stern * If there was an overcurrent or suspend change 11656ee0b270SAlan Stern * (i.e., remote wakeup request), have khubd 116672937e1eSSarah Sharp * take care of it. Look at the port link state 116772937e1eSSarah Sharp * for USB 3.0 hubs, since they don't have a suspend 116872937e1eSSarah Sharp * change bit, and they don't set the port link change 116972937e1eSSarah Sharp * bit on device-initiated resume. 11706ee0b270SAlan Stern */ 117172937e1eSSarah Sharp if (portchange || (hub_is_superspeed(hub->hdev) && 117272937e1eSSarah Sharp port_resumed)) 11736ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11746ee0b270SAlan Stern 11756ee0b270SAlan Stern } else if (udev->persist_enabled) { 1176ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[port1 - 1]; 1177ad493e5eSLan Tianyu 11786ee0b270SAlan Stern #ifdef CONFIG_PM 11795e6effaeSAlan Stern udev->reset_resume = 1; 11806ee0b270SAlan Stern #endif 1181ad493e5eSLan Tianyu /* Don't set the change_bits when the device 1182ad493e5eSLan Tianyu * was powered off. 1183ad493e5eSLan Tianyu */ 1184ad493e5eSLan Tianyu if (port_dev->power_is_on) 11858808f00cSAlan Stern set_bit(port1, hub->change_bits); 11868808f00cSAlan Stern 11876ee0b270SAlan Stern } else { 11886ee0b270SAlan Stern /* The power session is gone; tell khubd */ 11896ee0b270SAlan Stern usb_set_device_state(udev, USB_STATE_NOTATTACHED); 11906ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11915e6effaeSAlan Stern } 11925e6effaeSAlan Stern } 11935e6effaeSAlan Stern 1194948fea37SAlan Stern /* If no port-status-change flags were set, we don't need any 1195948fea37SAlan Stern * debouncing. If flags were set we can try to debounce the 1196948fea37SAlan Stern * ports all at once right now, instead of letting khubd do them 1197948fea37SAlan Stern * one at a time later on. 1198948fea37SAlan Stern * 1199948fea37SAlan Stern * If any port-status changes do occur during this delay, khubd 1200948fea37SAlan Stern * will see them later and handle them normally. 1201948fea37SAlan Stern */ 12028520f380SAlan Stern if (need_debounce_delay) { 12038520f380SAlan Stern delay = HUB_DEBOUNCE_STABLE; 1204f2835219SAlan Stern 12058520f380SAlan Stern /* Don't do a long sleep inside a workqueue routine */ 12068520f380SAlan Stern if (type == HUB_INIT2) { 12078520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); 120822f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 120922f6a0f0SShaibal Dutta &hub->init_work, 12108520f380SAlan Stern msecs_to_jiffies(delay)); 12118520f380SAlan Stern return; /* Continues at init3: below */ 12128520f380SAlan Stern } else { 12138520f380SAlan Stern msleep(delay); 12148520f380SAlan Stern } 12158520f380SAlan Stern } 12168520f380SAlan Stern init3: 1217f2835219SAlan Stern hub->quiescing = 0; 1218f2835219SAlan Stern 1219f2835219SAlan Stern status = usb_submit_urb(hub->urb, GFP_NOIO); 1220f2835219SAlan Stern if (status < 0) 1221f2835219SAlan Stern dev_err(hub->intfdev, "activate --> %d\n", status); 1222f2835219SAlan Stern if (hub->has_indicators && blinkenlights) 122322f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 122422f6a0f0SShaibal Dutta &hub->leds, LED_CYCLE_PERIOD); 1225f2835219SAlan Stern 1226f2835219SAlan Stern /* Scan all ports that need attention */ 1227f2835219SAlan Stern kick_khubd(hub); 12288e4ceb38SAlan Stern 12298e4ceb38SAlan Stern /* Allow autosuspend if it was suppressed */ 12308e4ceb38SAlan Stern if (type <= HUB_INIT3) 12318e4ceb38SAlan Stern usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); 12325e6effaeSAlan Stern } 12335e6effaeSAlan Stern 12348520f380SAlan Stern /* Implement the continuations for the delays above */ 12358520f380SAlan Stern static void hub_init_func2(struct work_struct *ws) 12368520f380SAlan Stern { 12378520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 12388520f380SAlan Stern 12398520f380SAlan Stern hub_activate(hub, HUB_INIT2); 12408520f380SAlan Stern } 12418520f380SAlan Stern 12428520f380SAlan Stern static void hub_init_func3(struct work_struct *ws) 12438520f380SAlan Stern { 12448520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 12458520f380SAlan Stern 12468520f380SAlan Stern hub_activate(hub, HUB_INIT3); 12478520f380SAlan Stern } 12488520f380SAlan Stern 12494330354fSAlan Stern enum hub_quiescing_type { 12504330354fSAlan Stern HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND 12514330354fSAlan Stern }; 12524330354fSAlan Stern 12534330354fSAlan Stern static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) 12544330354fSAlan Stern { 12554330354fSAlan Stern struct usb_device *hdev = hub->hdev; 12564330354fSAlan Stern int i; 12574330354fSAlan Stern 12588520f380SAlan Stern cancel_delayed_work_sync(&hub->init_work); 12598520f380SAlan Stern 12604330354fSAlan Stern /* khubd and related activity won't re-trigger */ 12614330354fSAlan Stern hub->quiescing = 1; 12624330354fSAlan Stern 12634330354fSAlan Stern if (type != HUB_SUSPEND) { 12644330354fSAlan Stern /* Disconnect all the children */ 12654330354fSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 1266ff823c79SLan Tianyu if (hub->ports[i]->child) 1267ff823c79SLan Tianyu usb_disconnect(&hub->ports[i]->child); 12684330354fSAlan Stern } 12694330354fSAlan Stern } 12704330354fSAlan Stern 12714330354fSAlan Stern /* Stop khubd and related activity */ 12724330354fSAlan Stern usb_kill_urb(hub->urb); 12734330354fSAlan Stern if (hub->has_indicators) 12744330354fSAlan Stern cancel_delayed_work_sync(&hub->leds); 12754330354fSAlan Stern if (hub->tt.hub) 1276036546bfSOctavian Purdila flush_work(&hub->tt.clear_work); 12774330354fSAlan Stern } 12784330354fSAlan Stern 12793eb14915SAlan Stern /* caller has locked the hub device */ 12803eb14915SAlan Stern static int hub_pre_reset(struct usb_interface *intf) 12813eb14915SAlan Stern { 12823eb14915SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 12833eb14915SAlan Stern 12844330354fSAlan Stern hub_quiesce(hub, HUB_PRE_RESET); 1285f07600cfSAlan Stern return 0; 12867d069b7dSAlan Stern } 12877d069b7dSAlan Stern 12887d069b7dSAlan Stern /* caller has locked the hub device */ 1289f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 12907d069b7dSAlan Stern { 12917de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 12927de18d8bSAlan Stern 1293f2835219SAlan Stern hub_activate(hub, HUB_POST_RESET); 1294f07600cfSAlan Stern return 0; 12957d069b7dSAlan Stern } 12967d069b7dSAlan Stern 12971da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 12981da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 12991da177e4SLinus Torvalds { 1300b356b7c7SSarah Sharp struct usb_hcd *hcd; 13011da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 13021da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 13031da177e4SLinus Torvalds u16 hubstatus, hubchange; 130474ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 13051da177e4SLinus Torvalds unsigned int pipe; 1306fa2a9566SLan Tianyu int maxp, ret, i; 13077cbe5dcaSAlan Stern char *message = "out of memory"; 1308430ee58eSSebastian Andrzej Siewior unsigned unit_load; 1309430ee58eSSebastian Andrzej Siewior unsigned full_load; 13101da177e4SLinus Torvalds 1311d697cddaSAlan Stern hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); 13121da177e4SLinus Torvalds if (!hub->buffer) { 13131da177e4SLinus Torvalds ret = -ENOMEM; 13141da177e4SLinus Torvalds goto fail; 13151da177e4SLinus Torvalds } 13161da177e4SLinus Torvalds 13171da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 13181da177e4SLinus Torvalds if (!hub->status) { 13191da177e4SLinus Torvalds ret = -ENOMEM; 13201da177e4SLinus Torvalds goto fail; 13211da177e4SLinus Torvalds } 1322db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 13231da177e4SLinus Torvalds 13241da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 13251da177e4SLinus Torvalds if (!hub->descriptor) { 13261da177e4SLinus Torvalds ret = -ENOMEM; 13271da177e4SLinus Torvalds goto fail; 13281da177e4SLinus Torvalds } 13291da177e4SLinus Torvalds 13301da177e4SLinus Torvalds /* Request the entire hub descriptor. 13311da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 13321da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 13331da177e4SLinus Torvalds */ 1334dbe79bbeSJohn Youn ret = get_hub_descriptor(hdev, hub->descriptor); 13351da177e4SLinus Torvalds if (ret < 0) { 13361da177e4SLinus Torvalds message = "can't read hub descriptor"; 13371da177e4SLinus Torvalds goto fail; 13381da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 13391da177e4SLinus Torvalds message = "hub has too many ports!"; 13401da177e4SLinus Torvalds ret = -ENODEV; 13411da177e4SLinus Torvalds goto fail; 1342769d7368SDavid Linares } else if (hub->descriptor->bNbrPorts == 0) { 1343769d7368SDavid Linares message = "hub doesn't have any ports!"; 1344769d7368SDavid Linares ret = -ENODEV; 1345769d7368SDavid Linares goto fail; 13461da177e4SLinus Torvalds } 13471da177e4SLinus Torvalds 13481da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 13491da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 13501da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 13511da177e4SLinus Torvalds 1352fa2a9566SLan Tianyu hub->ports = kzalloc(hdev->maxchild * sizeof(struct usb_port *), 1353336c5c31SLan Tianyu GFP_KERNEL); 1354ff823c79SLan Tianyu if (!hub->ports) { 13557cbe5dcaSAlan Stern ret = -ENOMEM; 13567cbe5dcaSAlan Stern goto fail; 13577cbe5dcaSAlan Stern } 13587cbe5dcaSAlan Stern 135974ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 1360430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hdev)) { 1361430ee58eSSebastian Andrzej Siewior unit_load = 150; 1362430ee58eSSebastian Andrzej Siewior full_load = 900; 1363430ee58eSSebastian Andrzej Siewior } else { 1364430ee58eSSebastian Andrzej Siewior unit_load = 100; 1365430ee58eSSebastian Andrzej Siewior full_load = 500; 1366430ee58eSSebastian Andrzej Siewior } 13671da177e4SLinus Torvalds 1368dbe79bbeSJohn Youn /* FIXME for USB 3.0, skip for now */ 1369dbe79bbeSJohn Youn if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && 1370dbe79bbeSJohn Youn !(hub_is_superspeed(hdev))) { 13711da177e4SLinus Torvalds int i; 13721da177e4SLinus Torvalds char portstr[USB_MAXCHILDREN + 1]; 13731da177e4SLinus Torvalds 13741da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 1375dbe79bbeSJohn Youn portstr[i] = hub->descriptor->u.hs.DeviceRemovable 13761da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 13771da177e4SLinus Torvalds ? 'F' : 'R'; 13781da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 13791da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 13801da177e4SLinus Torvalds } else 13811da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 13821da177e4SLinus Torvalds 138374ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 13847bf01185SAman Deep case HUB_CHAR_COMMON_LPSM: 13851da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 13861da177e4SLinus Torvalds break; 13877bf01185SAman Deep case HUB_CHAR_INDV_PORT_LPSM: 13881da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 13891da177e4SLinus Torvalds break; 13907bf01185SAman Deep case HUB_CHAR_NO_LPSM: 13917bf01185SAman Deep case HUB_CHAR_LPSM: 13921da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 13931da177e4SLinus Torvalds break; 13941da177e4SLinus Torvalds } 13951da177e4SLinus Torvalds 139674ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 13977bf01185SAman Deep case HUB_CHAR_COMMON_OCPM: 13981da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 13991da177e4SLinus Torvalds break; 14007bf01185SAman Deep case HUB_CHAR_INDV_PORT_OCPM: 14011da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 14021da177e4SLinus Torvalds break; 14037bf01185SAman Deep case HUB_CHAR_NO_OCPM: 14047bf01185SAman Deep case HUB_CHAR_OCPM: 14051da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 14061da177e4SLinus Torvalds break; 14071da177e4SLinus Torvalds } 14081da177e4SLinus Torvalds 14091da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 14101da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 1411cb88a1b8SAlan Stern INIT_WORK(&hub->tt.clear_work, hub_tt_work); 14121da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 14137bf01185SAman Deep case USB_HUB_PR_FS: 14141da177e4SLinus Torvalds break; 14157bf01185SAman Deep case USB_HUB_PR_HS_SINGLE_TT: 14161da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 14171da177e4SLinus Torvalds hub->tt.hub = hdev; 14181da177e4SLinus Torvalds break; 14197bf01185SAman Deep case USB_HUB_PR_HS_MULTI_TT: 14201da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 14211da177e4SLinus Torvalds if (ret == 0) { 14221da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 14231da177e4SLinus Torvalds hub->tt.multi = 1; 14241da177e4SLinus Torvalds } else 14251da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 14261da177e4SLinus Torvalds ret); 14271da177e4SLinus Torvalds hub->tt.hub = hdev; 14281da177e4SLinus Torvalds break; 14297bf01185SAman Deep case USB_HUB_PR_SS: 1430d2e9b4d6SSarah Sharp /* USB 3.0 hubs don't have a TT */ 1431d2e9b4d6SSarah Sharp break; 14321da177e4SLinus Torvalds default: 14331da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 14341da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 14351da177e4SLinus Torvalds break; 14361da177e4SLinus Torvalds } 14371da177e4SLinus Torvalds 1438e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 143974ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 1440e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 1441e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 1442e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 1443e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1444e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1445e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 1446e09711aeSdavid-b@pacbell.net } 14471da177e4SLinus Torvalds break; 1448e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 1449e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 1450e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1451e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1452e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 14531da177e4SLinus Torvalds break; 1454e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 1455e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 1456e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1457e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1458e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 14591da177e4SLinus Torvalds break; 1460e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 1461e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 1462e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1463e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1464e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 14651da177e4SLinus Torvalds break; 14661da177e4SLinus Torvalds } 14671da177e4SLinus Torvalds 14681da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 146974ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 14701da177e4SLinus Torvalds hub->has_indicators = 1; 14711da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 14721da177e4SLinus Torvalds } 14731da177e4SLinus Torvalds 14741da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 14751da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 14761da177e4SLinus Torvalds 14771da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 14781da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 14791da177e4SLinus Torvalds */ 14801da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 148115b7336eSAlan Stern if (ret) { 14821da177e4SLinus Torvalds message = "can't get hub status"; 14831da177e4SLinus Torvalds goto fail; 14841da177e4SLinus Torvalds } 1485430ee58eSSebastian Andrzej Siewior hcd = bus_to_hcd(hdev->bus); 14867d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 1487430ee58eSSebastian Andrzej Siewior if (hcd->power_budget > 0) 1488430ee58eSSebastian Andrzej Siewior hdev->bus_mA = hcd->power_budget; 1489430ee58eSSebastian Andrzej Siewior else 1490430ee58eSSebastian Andrzej Siewior hdev->bus_mA = full_load * hdev->maxchild; 1491430ee58eSSebastian Andrzej Siewior if (hdev->bus_mA >= full_load) 1492430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 149355c52718SAlan Stern else { 149455c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 149555c52718SAlan Stern hub->limited_power = 1; 149655c52718SAlan Stern } 14977d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 149855c52718SAlan Stern int remaining = hdev->bus_mA - 149955c52718SAlan Stern hub->descriptor->bHubContrCurrent; 15001da177e4SLinus Torvalds 1501430ee58eSSebastian Andrzej Siewior dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 1502430ee58eSSebastian Andrzej Siewior hub->descriptor->bHubContrCurrent); 1503430ee58eSSebastian Andrzej Siewior hub->limited_power = 1; 1504430ee58eSSebastian Andrzej Siewior 1505430ee58eSSebastian Andrzej Siewior if (remaining < hdev->maxchild * unit_load) 150655c52718SAlan Stern dev_warn(hub_dev, 150755c52718SAlan Stern "insufficient power available " 150855c52718SAlan Stern "to use all downstream ports\n"); 1509430ee58eSSebastian Andrzej Siewior hub->mA_per_port = unit_load; /* 7.2.1 */ 1510430ee58eSSebastian Andrzej Siewior 151155c52718SAlan Stern } else { /* Self-powered external hub */ 151255c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 151355c52718SAlan Stern * provide less current per port? */ 1514430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 151555c52718SAlan Stern } 1516430ee58eSSebastian Andrzej Siewior if (hub->mA_per_port < full_load) 151755c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 151855c52718SAlan Stern hub->mA_per_port); 15191da177e4SLinus Torvalds 1520b356b7c7SSarah Sharp /* Update the HCD's internal representation of this hub before khubd 1521b356b7c7SSarah Sharp * starts getting port status changes for devices under the hub. 1522b356b7c7SSarah Sharp */ 1523b356b7c7SSarah Sharp if (hcd->driver->update_hub_device) { 1524b356b7c7SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1525b356b7c7SSarah Sharp &hub->tt, GFP_KERNEL); 1526b356b7c7SSarah Sharp if (ret < 0) { 1527b356b7c7SSarah Sharp message = "can't update HCD hub info"; 1528b356b7c7SSarah Sharp goto fail; 1529b356b7c7SSarah Sharp } 1530b356b7c7SSarah Sharp } 1531b356b7c7SSarah Sharp 15321da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 15331da177e4SLinus Torvalds if (ret < 0) { 15341da177e4SLinus Torvalds message = "can't get hub status"; 15351da177e4SLinus Torvalds goto fail; 15361da177e4SLinus Torvalds } 15371da177e4SLinus Torvalds 15381da177e4SLinus Torvalds /* local power status reports aren't always correct */ 15391da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 15401da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 15411da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 15421da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 15431da177e4SLinus Torvalds 154474ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 15451da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 15461da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 15471da177e4SLinus Torvalds 154888fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 154988fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 155088fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 155188fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 155288fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 155388fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 15541da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 15551da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 15561da177e4SLinus Torvalds 15571da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 15581da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 15591da177e4SLinus Torvalds 15601da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 15611da177e4SLinus Torvalds if (!hub->urb) { 15621da177e4SLinus Torvalds ret = -ENOMEM; 15631da177e4SLinus Torvalds goto fail; 15641da177e4SLinus Torvalds } 15651da177e4SLinus Torvalds 15661da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 15671da177e4SLinus Torvalds hub, endpoint->bInterval); 15681da177e4SLinus Torvalds 15691da177e4SLinus Torvalds /* maybe cycle the hub leds */ 15701da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 15711da177e4SLinus Torvalds hub->indicator[0] = INDICATOR_CYCLE; 15721da177e4SLinus Torvalds 1573e58547ebSKrzysztof Mazur for (i = 0; i < hdev->maxchild; i++) { 1574e58547ebSKrzysztof Mazur ret = usb_hub_create_port_device(hub, i + 1); 1575e58547ebSKrzysztof Mazur if (ret < 0) { 1576fa2a9566SLan Tianyu dev_err(hub->intfdev, 1577fa2a9566SLan Tianyu "couldn't create port%d device.\n", i + 1); 1578e58547ebSKrzysztof Mazur hdev->maxchild = i; 1579e58547ebSKrzysztof Mazur goto fail_keep_maxchild; 1580e58547ebSKrzysztof Mazur } 1581e58547ebSKrzysztof Mazur } 1582fa2a9566SLan Tianyu 1583d2123fd9SLan Tianyu usb_hub_adjust_deviceremovable(hdev, hub->descriptor); 1584d2123fd9SLan Tianyu 1585f2835219SAlan Stern hub_activate(hub, HUB_INIT); 15861da177e4SLinus Torvalds return 0; 15871da177e4SLinus Torvalds 15881da177e4SLinus Torvalds fail: 1589d0308d4bSKrzysztof Mazur hdev->maxchild = 0; 1590e58547ebSKrzysztof Mazur fail_keep_maxchild: 15911da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 15921da177e4SLinus Torvalds message, ret); 15931da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 15941da177e4SLinus Torvalds return ret; 15951da177e4SLinus Torvalds } 15961da177e4SLinus Torvalds 1597e8054854SAlan Stern static void hub_release(struct kref *kref) 1598e8054854SAlan Stern { 1599e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 1600e8054854SAlan Stern 1601e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 1602e8054854SAlan Stern kfree(hub); 1603e8054854SAlan Stern } 1604e8054854SAlan Stern 16051da177e4SLinus Torvalds static unsigned highspeed_hubs; 16061da177e4SLinus Torvalds 16071da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 16081da177e4SLinus Torvalds { 16091da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 1610fa286188SGreg Kroah-Hartman struct usb_device *hdev = interface_to_usbdev(intf); 1611543d7784SAlan Stern int port1; 1612fa2a9566SLan Tianyu 1613e8054854SAlan Stern /* Take the hub off the event list and don't let it be added again */ 1614e8054854SAlan Stern spin_lock_irq(&hub_event_lock); 16158e4ceb38SAlan Stern if (!list_empty(&hub->event_list)) { 1616e8054854SAlan Stern list_del_init(&hub->event_list); 16178e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 16188e4ceb38SAlan Stern } 1619e8054854SAlan Stern hub->disconnected = 1; 1620e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 16211da177e4SLinus Torvalds 16227de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 16237de18d8bSAlan Stern hub->error = 0; 16244330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 16257de18d8bSAlan Stern 1626543d7784SAlan Stern /* Avoid races with recursively_mark_NOTATTACHED() */ 1627543d7784SAlan Stern spin_lock_irq(&device_state_lock); 1628543d7784SAlan Stern port1 = hdev->maxchild; 1629543d7784SAlan Stern hdev->maxchild = 0; 16308b28c752SAlan Stern usb_set_intfdata(intf, NULL); 1631543d7784SAlan Stern spin_unlock_irq(&device_state_lock); 16321f2235b8SAlexander Shishkin 1633543d7784SAlan Stern for (; port1 > 0; --port1) 1634543d7784SAlan Stern usb_hub_remove_port_device(hub, port1); 16351da177e4SLinus Torvalds 1636e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 16371da177e4SLinus Torvalds highspeed_hubs--; 16381da177e4SLinus Torvalds 16391da177e4SLinus Torvalds usb_free_urb(hub->urb); 1640fa2a9566SLan Tianyu kfree(hub->ports); 16411da177e4SLinus Torvalds kfree(hub->descriptor); 16421da177e4SLinus Torvalds kfree(hub->status); 1643d697cddaSAlan Stern kfree(hub->buffer); 16441da177e4SLinus Torvalds 1645971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, false); 1646e8054854SAlan Stern kref_put(&hub->kref, hub_release); 16471da177e4SLinus Torvalds } 16481da177e4SLinus Torvalds 16491da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 16501da177e4SLinus Torvalds { 16511da177e4SLinus Torvalds struct usb_host_interface *desc; 16521da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 16531da177e4SLinus Torvalds struct usb_device *hdev; 16541da177e4SLinus Torvalds struct usb_hub *hub; 16551da177e4SLinus Torvalds 16561da177e4SLinus Torvalds desc = intf->cur_altsetting; 16571da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 16581da177e4SLinus Torvalds 1659596d789aSMing Lei /* 1660596d789aSMing Lei * Set default autosuspend delay as 0 to speedup bus suspend, 1661596d789aSMing Lei * based on the below considerations: 1662596d789aSMing Lei * 1663596d789aSMing Lei * - Unlike other drivers, the hub driver does not rely on the 1664596d789aSMing Lei * autosuspend delay to provide enough time to handle a wakeup 1665596d789aSMing Lei * event, and the submitted status URB is just to check future 1666596d789aSMing Lei * change on hub downstream ports, so it is safe to do it. 1667596d789aSMing Lei * 1668596d789aSMing Lei * - The patch might cause one or more auto supend/resume for 1669596d789aSMing Lei * below very rare devices when they are plugged into hub 1670596d789aSMing Lei * first time: 1671596d789aSMing Lei * 1672596d789aSMing Lei * devices having trouble initializing, and disconnect 1673596d789aSMing Lei * themselves from the bus and then reconnect a second 1674596d789aSMing Lei * or so later 1675596d789aSMing Lei * 1676596d789aSMing Lei * devices just for downloading firmware, and disconnects 1677596d789aSMing Lei * themselves after completing it 1678596d789aSMing Lei * 1679596d789aSMing Lei * For these quite rare devices, their drivers may change the 1680596d789aSMing Lei * autosuspend delay of their parent hub in the probe() to one 1681596d789aSMing Lei * appropriate value to avoid the subtle problem if someone 1682596d789aSMing Lei * does care it. 1683596d789aSMing Lei * 1684596d789aSMing Lei * - The patch may cause one or more auto suspend/resume on 1685596d789aSMing Lei * hub during running 'lsusb', but it is probably too 1686596d789aSMing Lei * infrequent to worry about. 1687596d789aSMing Lei * 1688596d789aSMing Lei * - Change autosuspend delay of hub can avoid unnecessary auto 1689596d789aSMing Lei * suspend timer for hub, also may decrease power consumption 1690596d789aSMing Lei * of USB bus. 1691596d789aSMing Lei */ 1692596d789aSMing Lei pm_runtime_set_autosuspend_delay(&hdev->dev, 0); 1693596d789aSMing Lei 16942839f5bcSSarah Sharp /* Hubs have proper suspend/resume support. */ 1695088f7fecSAlan Stern usb_enable_autosuspend(hdev); 1696088f7fecSAlan Stern 169738f3ad5eSFelipe Balbi if (hdev->level == MAX_TOPO_LEVEL) { 1698b9cef6c3SWu Fengguang dev_err(&intf->dev, 1699b9cef6c3SWu Fengguang "Unsupported bus topology: hub nested too deep\n"); 170038f3ad5eSFelipe Balbi return -E2BIG; 170138f3ad5eSFelipe Balbi } 170238f3ad5eSFelipe Balbi 170389ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 170489ccbdc9SDavid Brownell if (hdev->parent) { 170589ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 170689ccbdc9SDavid Brownell return -ENODEV; 170789ccbdc9SDavid Brownell } 170889ccbdc9SDavid Brownell #endif 170989ccbdc9SDavid Brownell 17101da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 17111da177e4SLinus Torvalds /* specs is not defined, but it works */ 17121da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 17131da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 17141da177e4SLinus Torvalds descriptor_error: 17151da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 17161da177e4SLinus Torvalds return -EIO; 17171da177e4SLinus Torvalds } 17181da177e4SLinus Torvalds 17191da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 17201da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 17211da177e4SLinus Torvalds goto descriptor_error; 17221da177e4SLinus Torvalds 17231da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 17241da177e4SLinus Torvalds 1725fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 1726fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 17271da177e4SLinus Torvalds goto descriptor_error; 17281da177e4SLinus Torvalds 17291da177e4SLinus Torvalds /* We found a hub */ 17301da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 17311da177e4SLinus Torvalds 17320a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 17331da177e4SLinus Torvalds if (!hub) { 17341da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 17351da177e4SLinus Torvalds return -ENOMEM; 17361da177e4SLinus Torvalds } 17371da177e4SLinus Torvalds 1738e8054854SAlan Stern kref_init(&hub->kref); 17391da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 17401da177e4SLinus Torvalds hub->intfdev = &intf->dev; 17411da177e4SLinus Torvalds hub->hdev = hdev; 1742c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 17438520f380SAlan Stern INIT_DELAYED_WORK(&hub->init_work, NULL); 1744e8054854SAlan Stern usb_get_intf(intf); 17451da177e4SLinus Torvalds 17461da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 174740f122f3SAlan Stern intf->needs_remote_wakeup = 1; 1748971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, true); 17491da177e4SLinus Torvalds 17501da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 17511da177e4SLinus Torvalds highspeed_hubs++; 17521da177e4SLinus Torvalds 1753e6f30deaSMing Lei if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) 1754e6f30deaSMing Lei hub->quirk_check_port_auto_suspend = 1; 1755e6f30deaSMing Lei 17561da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 17571da177e4SLinus Torvalds return 0; 17581da177e4SLinus Torvalds 17591da177e4SLinus Torvalds hub_disconnect (intf); 17601da177e4SLinus Torvalds return -ENODEV; 17611da177e4SLinus Torvalds } 17621da177e4SLinus Torvalds 17631da177e4SLinus Torvalds static int 17641da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 17651da177e4SLinus Torvalds { 17661da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 1767ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 17681da177e4SLinus Torvalds 17691da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 17701da177e4SLinus Torvalds switch (code) { 17711da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 17721da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 17731da177e4SLinus Torvalds int i; 17741da177e4SLinus Torvalds 17751da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 17761da177e4SLinus Torvalds if (hdev->devnum <= 0) 17771da177e4SLinus Torvalds info->nports = 0; 17781da177e4SLinus Torvalds else { 17791da177e4SLinus Torvalds info->nports = hdev->maxchild; 17801da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 1781ff823c79SLan Tianyu if (hub->ports[i]->child == NULL) 17821da177e4SLinus Torvalds info->port[i] = 0; 17831da177e4SLinus Torvalds else 17841da177e4SLinus Torvalds info->port[i] = 1785ff823c79SLan Tianyu hub->ports[i]->child->devnum; 17861da177e4SLinus Torvalds } 17871da177e4SLinus Torvalds } 17881da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 17891da177e4SLinus Torvalds 17901da177e4SLinus Torvalds return info->nports + 1; 17911da177e4SLinus Torvalds } 17921da177e4SLinus Torvalds 17931da177e4SLinus Torvalds default: 17941da177e4SLinus Torvalds return -ENOSYS; 17951da177e4SLinus Torvalds } 17961da177e4SLinus Torvalds } 17971da177e4SLinus Torvalds 17987cbe5dcaSAlan Stern /* 17997cbe5dcaSAlan Stern * Allow user programs to claim ports on a hub. When a device is attached 18007cbe5dcaSAlan Stern * to one of these "claimed" ports, the program will "own" the device. 18017cbe5dcaSAlan Stern */ 18027cbe5dcaSAlan Stern static int find_port_owner(struct usb_device *hdev, unsigned port1, 1803336c5c31SLan Tianyu struct dev_state ***ppowner) 18047cbe5dcaSAlan Stern { 180541341261SMathias Nyman struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 180641341261SMathias Nyman 18077cbe5dcaSAlan Stern if (hdev->state == USB_STATE_NOTATTACHED) 18087cbe5dcaSAlan Stern return -ENODEV; 18097cbe5dcaSAlan Stern if (port1 == 0 || port1 > hdev->maxchild) 18107cbe5dcaSAlan Stern return -EINVAL; 18117cbe5dcaSAlan Stern 181241341261SMathias Nyman /* Devices not managed by the hub driver 18137cbe5dcaSAlan Stern * will always have maxchild equal to 0. 18147cbe5dcaSAlan Stern */ 181541341261SMathias Nyman *ppowner = &(hub->ports[port1 - 1]->port_owner); 18167cbe5dcaSAlan Stern return 0; 18177cbe5dcaSAlan Stern } 18187cbe5dcaSAlan Stern 18197cbe5dcaSAlan Stern /* In the following three functions, the caller must hold hdev's lock */ 1820336c5c31SLan Tianyu int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, 1821336c5c31SLan Tianyu struct dev_state *owner) 18227cbe5dcaSAlan Stern { 18237cbe5dcaSAlan Stern int rc; 1824336c5c31SLan Tianyu struct dev_state **powner; 18257cbe5dcaSAlan Stern 18267cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 18277cbe5dcaSAlan Stern if (rc) 18287cbe5dcaSAlan Stern return rc; 18297cbe5dcaSAlan Stern if (*powner) 18307cbe5dcaSAlan Stern return -EBUSY; 18317cbe5dcaSAlan Stern *powner = owner; 18327cbe5dcaSAlan Stern return rc; 18337cbe5dcaSAlan Stern } 18347cbe5dcaSAlan Stern 1835336c5c31SLan Tianyu int usb_hub_release_port(struct usb_device *hdev, unsigned port1, 1836336c5c31SLan Tianyu struct dev_state *owner) 18377cbe5dcaSAlan Stern { 18387cbe5dcaSAlan Stern int rc; 1839336c5c31SLan Tianyu struct dev_state **powner; 18407cbe5dcaSAlan Stern 18417cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 18427cbe5dcaSAlan Stern if (rc) 18437cbe5dcaSAlan Stern return rc; 18447cbe5dcaSAlan Stern if (*powner != owner) 18457cbe5dcaSAlan Stern return -ENOENT; 18467cbe5dcaSAlan Stern *powner = NULL; 18477cbe5dcaSAlan Stern return rc; 18487cbe5dcaSAlan Stern } 18497cbe5dcaSAlan Stern 1850336c5c31SLan Tianyu void usb_hub_release_all_ports(struct usb_device *hdev, struct dev_state *owner) 18517cbe5dcaSAlan Stern { 1852ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 18537cbe5dcaSAlan Stern int n; 18547cbe5dcaSAlan Stern 1855fa2a9566SLan Tianyu for (n = 0; n < hdev->maxchild; n++) { 1856fa2a9566SLan Tianyu if (hub->ports[n]->port_owner == owner) 1857fa2a9566SLan Tianyu hub->ports[n]->port_owner = NULL; 18587cbe5dcaSAlan Stern } 1859fa2a9566SLan Tianyu 18607cbe5dcaSAlan Stern } 18617cbe5dcaSAlan Stern 18627cbe5dcaSAlan Stern /* The caller must hold udev's lock */ 18637cbe5dcaSAlan Stern bool usb_device_is_owned(struct usb_device *udev) 18647cbe5dcaSAlan Stern { 18657cbe5dcaSAlan Stern struct usb_hub *hub; 18667cbe5dcaSAlan Stern 18677cbe5dcaSAlan Stern if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) 18687cbe5dcaSAlan Stern return false; 1869ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 1870fa2a9566SLan Tianyu return !!hub->ports[udev->portnum - 1]->port_owner; 18717cbe5dcaSAlan Stern } 18727cbe5dcaSAlan Stern 18731da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 18741da177e4SLinus Torvalds { 1875ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev); 18761da177e4SLinus Torvalds int i; 18771da177e4SLinus Torvalds 18781da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 1879ff823c79SLan Tianyu if (hub->ports[i]->child) 1880ff823c79SLan Tianyu recursively_mark_NOTATTACHED(hub->ports[i]->child); 18811da177e4SLinus Torvalds } 18829bbdf1e0SAlan Stern if (udev->state == USB_STATE_SUSPENDED) 188315123006SSarah Sharp udev->active_duration -= jiffies; 18841da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 18851da177e4SLinus Torvalds } 18861da177e4SLinus Torvalds 18871da177e4SLinus Torvalds /** 18881da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 18891da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 18901da177e4SLinus Torvalds * @new_state: new state value to be stored 18911da177e4SLinus Torvalds * 18921da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 18931da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 18941da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 18951da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 18961da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 18971da177e4SLinus Torvalds * all changes to any device's state must be protected by the 18981da177e4SLinus Torvalds * device_state_lock spinlock. 18991da177e4SLinus Torvalds * 19001da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 19011da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 19021da177e4SLinus Torvalds * 19031da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 19041da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 19051da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 19061da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 19071da177e4SLinus Torvalds */ 19081da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 19091da177e4SLinus Torvalds enum usb_device_state new_state) 19101da177e4SLinus Torvalds { 19111da177e4SLinus Torvalds unsigned long flags; 19124681b171SRafael J. Wysocki int wakeup = -1; 19131da177e4SLinus Torvalds 19141da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 19151da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 19161da177e4SLinus Torvalds ; /* do nothing */ 1917b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1918fb669cc0SDavid Brownell 1919fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1920fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1921fb669cc0SDavid Brownell */ 1922fb669cc0SDavid Brownell if (udev->parent) { 1923645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1924645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1925645daaabSAlan Stern ; /* No change to wakeup settings */ 1926645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 19274681b171SRafael J. Wysocki wakeup = udev->actconfig->desc.bmAttributes 19284681b171SRafael J. Wysocki & USB_CONFIG_ATT_WAKEUP; 1929645daaabSAlan Stern else 19304681b171SRafael J. Wysocki wakeup = 0; 1931fb669cc0SDavid Brownell } 193215123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED && 193315123006SSarah Sharp new_state != USB_STATE_SUSPENDED) 193415123006SSarah Sharp udev->active_duration -= jiffies; 193515123006SSarah Sharp else if (new_state == USB_STATE_SUSPENDED && 193615123006SSarah Sharp udev->state != USB_STATE_SUSPENDED) 193715123006SSarah Sharp udev->active_duration += jiffies; 1938645daaabSAlan Stern udev->state = new_state; 1939b94dc6b5SDavid Brownell } else 19401da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 19411da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 19424681b171SRafael J. Wysocki if (wakeup >= 0) 19434681b171SRafael J. Wysocki device_set_wakeup_capable(&udev->dev, wakeup); 19441da177e4SLinus Torvalds } 19456da9c990SDavid Vrabel EXPORT_SYMBOL_GPL(usb_set_device_state); 19461da177e4SLinus Torvalds 19478af548dcSInaky Perez-Gonzalez /* 19483b29b68bSAlan Stern * Choose a device number. 19493b29b68bSAlan Stern * 19503b29b68bSAlan Stern * Device numbers are used as filenames in usbfs. On USB-1.1 and 19513b29b68bSAlan Stern * USB-2.0 buses they are also used as device addresses, however on 19523b29b68bSAlan Stern * USB-3.0 buses the address is assigned by the controller hardware 19533b29b68bSAlan Stern * and it usually is not the same as the device number. 19543b29b68bSAlan Stern * 19558af548dcSInaky Perez-Gonzalez * WUSB devices are simple: they have no hubs behind, so the mapping 19568af548dcSInaky Perez-Gonzalez * device <-> virtual port number becomes 1:1. Why? to simplify the 19578af548dcSInaky Perez-Gonzalez * life of the device connection logic in 19588af548dcSInaky Perez-Gonzalez * drivers/usb/wusbcore/devconnect.c. When we do the initial secret 19598af548dcSInaky Perez-Gonzalez * handshake we need to assign a temporary address in the unauthorized 19608af548dcSInaky Perez-Gonzalez * space. For simplicity we use the first virtual port number found to 19618af548dcSInaky Perez-Gonzalez * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] 19628af548dcSInaky Perez-Gonzalez * and that becomes it's address [X < 128] or its unauthorized address 19638af548dcSInaky Perez-Gonzalez * [X | 0x80]. 19648af548dcSInaky Perez-Gonzalez * 19658af548dcSInaky Perez-Gonzalez * We add 1 as an offset to the one-based USB-stack port number 19668af548dcSInaky Perez-Gonzalez * (zero-based wusb virtual port index) for two reasons: (a) dev addr 19678af548dcSInaky Perez-Gonzalez * 0 is reserved by USB for default address; (b) Linux's USB stack 19688af548dcSInaky Perez-Gonzalez * uses always #1 for the root hub of the controller. So USB stack's 19698af548dcSInaky Perez-Gonzalez * port #1, which is wusb virtual-port #0 has address #2. 1970c6515272SSarah Sharp * 1971c6515272SSarah Sharp * Devices connected under xHCI are not as simple. The host controller 1972c6515272SSarah Sharp * supports virtualization, so the hardware assigns device addresses and 1973c6515272SSarah Sharp * the HCD must setup data structures before issuing a set address 1974c6515272SSarah Sharp * command to the hardware. 19758af548dcSInaky Perez-Gonzalez */ 19763b29b68bSAlan Stern static void choose_devnum(struct usb_device *udev) 19771da177e4SLinus Torvalds { 19781da177e4SLinus Torvalds int devnum; 19791da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 19801da177e4SLinus Torvalds 19811da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 19828af548dcSInaky Perez-Gonzalez if (udev->wusb) { 19838af548dcSInaky Perez-Gonzalez devnum = udev->portnum + 1; 19848af548dcSInaky Perez-Gonzalez BUG_ON(test_bit(devnum, bus->devmap.devicemap)); 19858af548dcSInaky Perez-Gonzalez } else { 19868af548dcSInaky Perez-Gonzalez /* Try to allocate the next devnum beginning at 19878af548dcSInaky Perez-Gonzalez * bus->devnum_next. */ 19881da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 19891da177e4SLinus Torvalds bus->devnum_next); 19901da177e4SLinus Torvalds if (devnum >= 128) 19918af548dcSInaky Perez-Gonzalez devnum = find_next_zero_bit(bus->devmap.devicemap, 19928af548dcSInaky Perez-Gonzalez 128, 1); 19931da177e4SLinus Torvalds bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1); 19948af548dcSInaky Perez-Gonzalez } 19951da177e4SLinus Torvalds if (devnum < 128) { 19961da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 19971da177e4SLinus Torvalds udev->devnum = devnum; 19981da177e4SLinus Torvalds } 19991da177e4SLinus Torvalds } 20001da177e4SLinus Torvalds 20013b29b68bSAlan Stern static void release_devnum(struct usb_device *udev) 20021da177e4SLinus Torvalds { 20031da177e4SLinus Torvalds if (udev->devnum > 0) { 20041da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 20051da177e4SLinus Torvalds udev->devnum = -1; 20061da177e4SLinus Torvalds } 20071da177e4SLinus Torvalds } 20081da177e4SLinus Torvalds 20093b29b68bSAlan Stern static void update_devnum(struct usb_device *udev, int devnum) 20104953d141SDavid Vrabel { 20114953d141SDavid Vrabel /* The address for a WUSB device is managed by wusbcore. */ 20124953d141SDavid Vrabel if (!udev->wusb) 20134953d141SDavid Vrabel udev->devnum = devnum; 20144953d141SDavid Vrabel } 20154953d141SDavid Vrabel 2016f7410cedSHerbert Xu static void hub_free_dev(struct usb_device *udev) 2017f7410cedSHerbert Xu { 2018f7410cedSHerbert Xu struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2019f7410cedSHerbert Xu 2020f7410cedSHerbert Xu /* Root hubs aren't real devices, so don't free HCD resources */ 2021f7410cedSHerbert Xu if (hcd->driver->free_dev && udev->parent) 2022f7410cedSHerbert Xu hcd->driver->free_dev(hcd, udev); 2023f7410cedSHerbert Xu } 2024f7410cedSHerbert Xu 20251da177e4SLinus Torvalds /** 20261da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 20271da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 20281da177e4SLinus Torvalds * Context: !in_interrupt () 20291da177e4SLinus Torvalds * 20301da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 20311da177e4SLinus Torvalds * 20321da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 2033db8f2aa3SBjorn Helgaas * If *pdev is a root hub then the caller must hold the usb_bus_list_lock, 2034db8f2aa3SBjorn Helgaas * which protects the set of root hubs as well as the list of buses. 20351da177e4SLinus Torvalds * 20361da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 20371da177e4SLinus Torvalds * controllers) should ever call this. 20381da177e4SLinus Torvalds * 20391da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 20401da177e4SLinus Torvalds */ 20411da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 20421da177e4SLinus Torvalds { 20431da177e4SLinus Torvalds struct usb_device *udev = *pdev; 2044ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev); 20451da177e4SLinus Torvalds int i; 20461da177e4SLinus Torvalds 20471da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 20481da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 204925985edcSLucas De Marchi * this quiesces everything except pending urbs. 20501da177e4SLinus Torvalds */ 20511da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 20523b29b68bSAlan Stern dev_info(&udev->dev, "USB disconnect, device number %d\n", 20533b29b68bSAlan Stern udev->devnum); 20541da177e4SLinus Torvalds 20559ad3d6ccSAlan Stern usb_lock_device(udev); 20569ad3d6ccSAlan Stern 20571da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 20588816230eSHuajun Li for (i = 0; i < udev->maxchild; i++) { 2059ff823c79SLan Tianyu if (hub->ports[i]->child) 2060ff823c79SLan Tianyu usb_disconnect(&hub->ports[i]->child); 20611da177e4SLinus Torvalds } 20621da177e4SLinus Torvalds 20631da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 20641da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 20651da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 20661da177e4SLinus Torvalds */ 2067782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 20681da177e4SLinus Torvalds usb_disable_device(udev, 0); 2069cde217a5SAlan Stern usb_hcd_synchronize_unlinks(udev); 20701da177e4SLinus Torvalds 2071fde26380SLan Tianyu if (udev->parent) { 2072ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2073ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 2074fde26380SLan Tianyu 2075fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2076fde26380SLan Tianyu sysfs_remove_link(&port_dev->dev.kobj, "device"); 2077971fcd49SLan Tianyu 2078ad493e5eSLan Tianyu if (!port_dev->did_runtime_put) 2079971fcd49SLan Tianyu pm_runtime_put(&port_dev->dev); 2080ad493e5eSLan Tianyu else 2081ad493e5eSLan Tianyu port_dev->did_runtime_put = false; 2082fde26380SLan Tianyu } 2083fde26380SLan Tianyu 20843b23dd6fSAlan Stern usb_remove_ep_devs(&udev->ep0); 2085782da727SAlan Stern usb_unlock_device(udev); 20863099e75aSGreg Kroah-Hartman 2087782da727SAlan Stern /* Unregister the device. The device driver is responsible 20883b23dd6fSAlan Stern * for de-configuring the device and invoking the remove-device 20893b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2090782da727SAlan Stern */ 2091782da727SAlan Stern device_del(&udev->dev); 2092782da727SAlan Stern 2093782da727SAlan Stern /* Free the device number and delete the parent's children[] 20941da177e4SLinus Torvalds * (or root_hub) pointer. 20951da177e4SLinus Torvalds */ 20963b29b68bSAlan Stern release_devnum(udev); 20971da177e4SLinus Torvalds 20981da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 20991da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 21001da177e4SLinus Torvalds *pdev = NULL; 21011da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 21021da177e4SLinus Torvalds 2103f7410cedSHerbert Xu hub_free_dev(udev); 2104f7410cedSHerbert Xu 2105782da727SAlan Stern put_device(&udev->dev); 21061da177e4SLinus Torvalds } 21071da177e4SLinus Torvalds 2108f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 21091da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 21101da177e4SLinus Torvalds { 21111da177e4SLinus Torvalds if (!string) 21121da177e4SLinus Torvalds return; 2113f2ec522eSJoe Perches dev_info(&udev->dev, "%s: %s\n", id, string); 21141da177e4SLinus Torvalds } 21151da177e4SLinus Torvalds 2116f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 2117f2a383e4SGreg Kroah-Hartman { 2118f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", 2119f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 2120f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idProduct)); 2121b9cef6c3SWu Fengguang dev_info(&udev->dev, 2122b9cef6c3SWu Fengguang "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", 2123f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 2124f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 2125f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 2126f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 2127f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 2128f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 2129f2a383e4SGreg Kroah-Hartman } 21301da177e4SLinus Torvalds #else 2131f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 21321da177e4SLinus Torvalds #endif 21331da177e4SLinus Torvalds 21341da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 21351da177e4SLinus Torvalds #include "otg_whitelist.h" 21361da177e4SLinus Torvalds #endif 21371da177e4SLinus Torvalds 21383ede760fSOliver Neukum /** 21398d8558d1SAlan Stern * usb_enumerate_device_otg - FIXME (usbcore-internal) 21403ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 21413ede760fSOliver Neukum * 21428d8558d1SAlan Stern * Finish enumeration for On-The-Go devices 2143626f090cSYacine Belkadi * 2144626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 21453ede760fSOliver Neukum */ 21468d8558d1SAlan Stern static int usb_enumerate_device_otg(struct usb_device *udev) 21471da177e4SLinus Torvalds { 2148d9d16e8aSInaky Perez-Gonzalez int err = 0; 21491da177e4SLinus Torvalds 21501da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 21511da177e4SLinus Torvalds /* 21521da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 21531da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 21541da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 21551da177e4SLinus Torvalds */ 21561da177e4SLinus Torvalds if (!udev->bus->is_b_host 21571da177e4SLinus Torvalds && udev->config 21581da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 21592eb5052eSFelipe Balbi struct usb_otg_descriptor *desc = NULL; 21601da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 21611da177e4SLinus Torvalds 21621da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 21631da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 21641da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 21651da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 21661da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 216712c3da34SAlan Stern unsigned port1 = udev->portnum; 21681da177e4SLinus Torvalds 21691da177e4SLinus Torvalds dev_info(&udev->dev, 21701da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 21711da177e4SLinus Torvalds (port1 == bus->otg_port) 21721da177e4SLinus Torvalds ? "" : "non-"); 21731da177e4SLinus Torvalds 21741da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 21751da177e4SLinus Torvalds if (port1 == bus->otg_port) 21761da177e4SLinus Torvalds bus->b_hnp_enable = 1; 21771da177e4SLinus Torvalds err = usb_control_msg(udev, 21781da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 21791da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 21801da177e4SLinus Torvalds bus->b_hnp_enable 21811da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 21821da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 21831da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 21841da177e4SLinus Torvalds if (err < 0) { 21851da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 21861da177e4SLinus Torvalds * customize to match your product. 21871da177e4SLinus Torvalds */ 21881da177e4SLinus Torvalds dev_info(&udev->dev, 2189b9cef6c3SWu Fengguang "can't set HNP mode: %d\n", 21901da177e4SLinus Torvalds err); 21911da177e4SLinus Torvalds bus->b_hnp_enable = 0; 21921da177e4SLinus Torvalds } 21931da177e4SLinus Torvalds } 21941da177e4SLinus Torvalds } 21951da177e4SLinus Torvalds } 21961da177e4SLinus Torvalds 21971da177e4SLinus Torvalds if (!is_targeted(udev)) { 21981da177e4SLinus Torvalds 21991da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 22001da177e4SLinus Torvalds * (Includes HNP test device.) 22011da177e4SLinus Torvalds */ 22021da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 2203634a84f8SDavid Brownell err = usb_port_suspend(udev, PMSG_SUSPEND); 22041da177e4SLinus Torvalds if (err < 0) 22051da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 22061da177e4SLinus Torvalds } 2207ffcdc18dSVikram Pandita err = -ENOTSUPP; 22081da177e4SLinus Torvalds goto fail; 22091da177e4SLinus Torvalds } 2210d9d16e8aSInaky Perez-Gonzalez fail: 22111da177e4SLinus Torvalds #endif 2212d9d16e8aSInaky Perez-Gonzalez return err; 2213d9d16e8aSInaky Perez-Gonzalez } 22141da177e4SLinus Torvalds 2215d9d16e8aSInaky Perez-Gonzalez 2216d9d16e8aSInaky Perez-Gonzalez /** 22178d8558d1SAlan Stern * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) 2218d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2219d9d16e8aSInaky Perez-Gonzalez * 2220d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 2221d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 2222d9d16e8aSInaky Perez-Gonzalez * environment. 2223d9d16e8aSInaky Perez-Gonzalez * 2224d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 2225d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 2226d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 2227626f090cSYacine Belkadi * 2228626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 2229d9d16e8aSInaky Perez-Gonzalez */ 22308d8558d1SAlan Stern static int usb_enumerate_device(struct usb_device *udev) 2231d9d16e8aSInaky Perez-Gonzalez { 2232d9d16e8aSInaky Perez-Gonzalez int err; 2233d9d16e8aSInaky Perez-Gonzalez 2234d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 2235d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 2236d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 2237e9e88fb7SAlan Stern if (err != -ENODEV) 2238d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 2239d9d16e8aSInaky Perez-Gonzalez err); 224080da2e0dSLaurent Pinchart return err; 2241d9d16e8aSInaky Perez-Gonzalez } 2242d9d16e8aSInaky Perez-Gonzalez } 224383e83ecbSThomas Pugliese 2244d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 2245d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 2246d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 2247d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 2248d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 224983e83ecbSThomas Pugliese 22508d8558d1SAlan Stern err = usb_enumerate_device_otg(udev); 225180da2e0dSLaurent Pinchart if (err < 0) 2252d9d16e8aSInaky Perez-Gonzalez return err; 225380da2e0dSLaurent Pinchart 225480da2e0dSLaurent Pinchart usb_detect_interface_quirks(udev); 225580da2e0dSLaurent Pinchart 225680da2e0dSLaurent Pinchart return 0; 2257d9d16e8aSInaky Perez-Gonzalez } 2258d9d16e8aSInaky Perez-Gonzalez 2259d35e70d5SMatthew Garrett static void set_usb_port_removable(struct usb_device *udev) 2260d35e70d5SMatthew Garrett { 2261d35e70d5SMatthew Garrett struct usb_device *hdev = udev->parent; 2262d35e70d5SMatthew Garrett struct usb_hub *hub; 2263d35e70d5SMatthew Garrett u8 port = udev->portnum; 2264d35e70d5SMatthew Garrett u16 wHubCharacteristics; 2265d35e70d5SMatthew Garrett bool removable = true; 2266d35e70d5SMatthew Garrett 2267d35e70d5SMatthew Garrett if (!hdev) 2268d35e70d5SMatthew Garrett return; 2269d35e70d5SMatthew Garrett 2270ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 2271d35e70d5SMatthew Garrett 2272d35e70d5SMatthew Garrett wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 2273d35e70d5SMatthew Garrett 2274d35e70d5SMatthew Garrett if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) 2275d35e70d5SMatthew Garrett return; 2276d35e70d5SMatthew Garrett 2277d35e70d5SMatthew Garrett if (hub_is_superspeed(hdev)) { 2278ca3c1539SLan Tianyu if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) 2279ca3c1539SLan Tianyu & (1 << port)) 2280d35e70d5SMatthew Garrett removable = false; 2281d35e70d5SMatthew Garrett } else { 2282d35e70d5SMatthew Garrett if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) 2283d35e70d5SMatthew Garrett removable = false; 2284d35e70d5SMatthew Garrett } 2285d35e70d5SMatthew Garrett 2286d35e70d5SMatthew Garrett if (removable) 2287d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_REMOVABLE; 2288d35e70d5SMatthew Garrett else 2289d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_FIXED; 2290d35e70d5SMatthew Garrett } 2291d9d16e8aSInaky Perez-Gonzalez 2292d9d16e8aSInaky Perez-Gonzalez /** 2293d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 2294d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2295d9d16e8aSInaky Perez-Gonzalez * 22968d8558d1SAlan Stern * This is called with devices which have been detected but not fully 22978d8558d1SAlan Stern * enumerated. The device descriptor is available, but not descriptors 2298d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 2299d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 2300d9d16e8aSInaky Perez-Gonzalez * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 2301d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 2302d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 2303d9d16e8aSInaky Perez-Gonzalez * 2304d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 2305d9d16e8aSInaky Perez-Gonzalez * 2306d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 2307626f090cSYacine Belkadi * 2308626f090cSYacine Belkadi * Return: Whether the device is configured properly or not. Zero if the 2309626f090cSYacine Belkadi * interface was registered with the driver core; else a negative errno 2310626f090cSYacine Belkadi * value. 2311626f090cSYacine Belkadi * 2312d9d16e8aSInaky Perez-Gonzalez */ 2313d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 2314d9d16e8aSInaky Perez-Gonzalez { 2315d9d16e8aSInaky Perez-Gonzalez int err; 2316d9d16e8aSInaky Perez-Gonzalez 231716985408SDan Streetman if (udev->parent) { 231816985408SDan Streetman /* Initialize non-root-hub device wakeup to disabled; 231916985408SDan Streetman * device (un)configuration controls wakeup capable 232016985408SDan Streetman * sysfs power/wakeup controls wakeup enabled/disabled 232116985408SDan Streetman */ 232216985408SDan Streetman device_init_wakeup(&udev->dev, 0); 232316985408SDan Streetman } 232416985408SDan Streetman 23259bbdf1e0SAlan Stern /* Tell the runtime-PM framework the device is active */ 23269bbdf1e0SAlan Stern pm_runtime_set_active(&udev->dev); 2327c08512c7SAlan Stern pm_runtime_get_noresume(&udev->dev); 2328fcc4a01eSAlan Stern pm_runtime_use_autosuspend(&udev->dev); 23299bbdf1e0SAlan Stern pm_runtime_enable(&udev->dev); 23309bbdf1e0SAlan Stern 2331c08512c7SAlan Stern /* By default, forbid autosuspend for all devices. It will be 2332c08512c7SAlan Stern * allowed for hubs during binding. 2333c08512c7SAlan Stern */ 2334c08512c7SAlan Stern usb_disable_autosuspend(udev); 2335c08512c7SAlan Stern 23368d8558d1SAlan Stern err = usb_enumerate_device(udev); /* Read descriptors */ 2337d9d16e8aSInaky Perez-Gonzalez if (err < 0) 2338d9d16e8aSInaky Perez-Gonzalez goto fail; 2339c6515272SSarah Sharp dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", 2340c6515272SSarah Sharp udev->devnum, udev->bus->busnum, 2341c6515272SSarah Sharp (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 23429f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 23439f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 23449f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 23459f8b17e6SKay Sievers 23466cd13201SAlan Stern /* Tell the world! */ 23476cd13201SAlan Stern announce_device(udev); 2348195af2ccSAlan Stern 2349b04b3156STheodore Ts'o if (udev->serial) 2350b04b3156STheodore Ts'o add_device_randomness(udev->serial, strlen(udev->serial)); 2351b04b3156STheodore Ts'o if (udev->product) 2352b04b3156STheodore Ts'o add_device_randomness(udev->product, strlen(udev->product)); 2353b04b3156STheodore Ts'o if (udev->manufacturer) 2354b04b3156STheodore Ts'o add_device_randomness(udev->manufacturer, 2355b04b3156STheodore Ts'o strlen(udev->manufacturer)); 2356b04b3156STheodore Ts'o 2357927bc916SRafael J. Wysocki device_enable_async_suspend(&udev->dev); 2358d35e70d5SMatthew Garrett 2359d35e70d5SMatthew Garrett /* 2360d35e70d5SMatthew Garrett * check whether the hub marks this port as non-removable. Do it 2361d35e70d5SMatthew Garrett * now so that platform-specific data can override it in 2362d35e70d5SMatthew Garrett * device_add() 2363d35e70d5SMatthew Garrett */ 2364d35e70d5SMatthew Garrett if (udev->parent) 2365d35e70d5SMatthew Garrett set_usb_port_removable(udev); 2366d35e70d5SMatthew Garrett 2367782da727SAlan Stern /* Register the device. The device driver is responsible 23683b23dd6fSAlan Stern * for configuring the device and invoking the add-device 23693b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2370782da727SAlan Stern */ 23711da177e4SLinus Torvalds err = device_add(&udev->dev); 23721da177e4SLinus Torvalds if (err) { 23731da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 23741da177e4SLinus Torvalds goto fail; 23751da177e4SLinus Torvalds } 23769ad3d6ccSAlan Stern 2377fde26380SLan Tianyu /* Create link files between child device and usb port device. */ 2378fde26380SLan Tianyu if (udev->parent) { 2379ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2380ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 2381fde26380SLan Tianyu 2382fde26380SLan Tianyu err = sysfs_create_link(&udev->dev.kobj, 2383fde26380SLan Tianyu &port_dev->dev.kobj, "port"); 2384fde26380SLan Tianyu if (err) 2385fde26380SLan Tianyu goto fail; 2386fde26380SLan Tianyu 2387fde26380SLan Tianyu err = sysfs_create_link(&port_dev->dev.kobj, 2388fde26380SLan Tianyu &udev->dev.kobj, "device"); 2389fde26380SLan Tianyu if (err) { 2390fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2391fde26380SLan Tianyu goto fail; 2392fde26380SLan Tianyu } 2393971fcd49SLan Tianyu 2394971fcd49SLan Tianyu pm_runtime_get_sync(&port_dev->dev); 2395fde26380SLan Tianyu } 2396fde26380SLan Tianyu 23973b23dd6fSAlan Stern (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); 2398c08512c7SAlan Stern usb_mark_last_busy(udev); 2399c08512c7SAlan Stern pm_runtime_put_sync_autosuspend(&udev->dev); 2400c066475eSGreg Kroah-Hartman return err; 24011da177e4SLinus Torvalds 24021da177e4SLinus Torvalds fail: 24031da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 24049bbdf1e0SAlan Stern pm_runtime_disable(&udev->dev); 24059bbdf1e0SAlan Stern pm_runtime_set_suspended(&udev->dev); 2406d9d16e8aSInaky Perez-Gonzalez return err; 24071da177e4SLinus Torvalds } 24081da177e4SLinus Torvalds 240993993a0aSInaky Perez-Gonzalez 241093993a0aSInaky Perez-Gonzalez /** 2411fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 2412fd39c86bSRandy Dunlap * @usb_dev: USB device 2413fd39c86bSRandy Dunlap * 2414fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 2415fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 241693993a0aSInaky Perez-Gonzalez * 241793993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 241893993a0aSInaky Perez-Gonzalez * defer its call. 2419626f090cSYacine Belkadi * 2420626f090cSYacine Belkadi * Return: 0. 242193993a0aSInaky Perez-Gonzalez */ 242293993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 242393993a0aSInaky Perez-Gonzalez { 242493993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 242593993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 242693993a0aSInaky Perez-Gonzalez goto out_unauthorized; 2427da307123SAlan Stern 242893993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 242993993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 2430da307123SAlan Stern 243193993a0aSInaky Perez-Gonzalez out_unauthorized: 243293993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 243393993a0aSInaky Perez-Gonzalez return 0; 243493993a0aSInaky Perez-Gonzalez } 243593993a0aSInaky Perez-Gonzalez 243693993a0aSInaky Perez-Gonzalez 243793993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 243893993a0aSInaky Perez-Gonzalez { 243993993a0aSInaky Perez-Gonzalez int result = 0, c; 2440da307123SAlan Stern 244193993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 244293993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 244393993a0aSInaky Perez-Gonzalez goto out_authorized; 2444da307123SAlan Stern 244593993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 244693993a0aSInaky Perez-Gonzalez if (result < 0) { 244793993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 244893993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 244993993a0aSInaky Perez-Gonzalez goto error_autoresume; 245093993a0aSInaky Perez-Gonzalez } 245193993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 245293993a0aSInaky Perez-Gonzalez if (result < 0) { 245393993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 245493993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 245593993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 245693993a0aSInaky Perez-Gonzalez } 2457da307123SAlan Stern 245893993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 245993993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 246093993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 246193993a0aSInaky Perez-Gonzalez */ 2462b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 246393993a0aSInaky Perez-Gonzalez if (c >= 0) { 246493993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 246593993a0aSInaky Perez-Gonzalez if (result) { 246693993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 246793993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 246893993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 246993993a0aSInaky Perez-Gonzalez * set other configurations. */ 247093993a0aSInaky Perez-Gonzalez } 247193993a0aSInaky Perez-Gonzalez } 247293993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 2473da307123SAlan Stern 247493993a0aSInaky Perez-Gonzalez error_device_descriptor: 2475da307123SAlan Stern usb_autosuspend_device(usb_dev); 247693993a0aSInaky Perez-Gonzalez error_autoresume: 247793993a0aSInaky Perez-Gonzalez out_authorized: 2478781b2137SMatthias Beyer usb_unlock_device(usb_dev); /* complements locktree */ 247993993a0aSInaky Perez-Gonzalez return result; 248093993a0aSInaky Perez-Gonzalez } 248193993a0aSInaky Perez-Gonzalez 248293993a0aSInaky Perez-Gonzalez 24830165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 24840165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 24850165de09SInaky Perez-Gonzalez { 24860165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 24870165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 24880165de09SInaky Perez-Gonzalez return 0; 24890165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 24900165de09SInaky Perez-Gonzalez return hcd->wireless; 24910165de09SInaky Perez-Gonzalez } 24920165de09SInaky Perez-Gonzalez 24930165de09SInaky Perez-Gonzalez 24941da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 24951da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 24961da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 24971da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 249890ab5ee9SRusty Russell #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first) 24991da177e4SLinus Torvalds 25001da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 25011da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 250275d7cf72SAndiry Xu #define HUB_BH_RESET_TIME 50 25031da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 250477c7f072SSarah Sharp #define HUB_RESET_TIMEOUT 800 25051da177e4SLinus Torvalds 250648fc7dbdSDan Williams /* 250748fc7dbdSDan Williams * "New scheme" enumeration causes an extra state transition to be 250848fc7dbdSDan Williams * exposed to an xhci host and causes USB3 devices to receive control 250948fc7dbdSDan Williams * commands in the default state. This has been seen to cause 251048fc7dbdSDan Williams * enumeration failures, so disable this enumeration scheme for USB3 251148fc7dbdSDan Williams * devices. 251248fc7dbdSDan Williams */ 251348fc7dbdSDan Williams static bool use_new_scheme(struct usb_device *udev, int retry) 251448fc7dbdSDan Williams { 251548fc7dbdSDan Williams if (udev->speed == USB_SPEED_SUPER) 251648fc7dbdSDan Williams return false; 251748fc7dbdSDan Williams 251848fc7dbdSDan Williams return USE_NEW_SCHEME(retry); 251948fc7dbdSDan Williams } 252048fc7dbdSDan Williams 252110d674a8SSarah Sharp static int hub_port_reset(struct usb_hub *hub, int port1, 252210d674a8SSarah Sharp struct usb_device *udev, unsigned int delay, bool warm); 252310d674a8SSarah Sharp 2524025d4430SRahul Bedarkar /* Is a USB 3.0 port in the Inactive or Compliance Mode state? 25258bea2bd3SStanislaw Ledwon * Port worm reset is required to recover 25268bea2bd3SStanislaw Ledwon */ 25278bea2bd3SStanislaw Ledwon static bool hub_port_warm_reset_required(struct usb_hub *hub, u16 portstatus) 252810d674a8SSarah Sharp { 252910d674a8SSarah Sharp return hub_is_superspeed(hub->hdev) && 25308bea2bd3SStanislaw Ledwon (((portstatus & USB_PORT_STAT_LINK_STATE) == 25318bea2bd3SStanislaw Ledwon USB_SS_PORT_LS_SS_INACTIVE) || 25328bea2bd3SStanislaw Ledwon ((portstatus & USB_PORT_STAT_LINK_STATE) == 25338bea2bd3SStanislaw Ledwon USB_SS_PORT_LS_COMP_MOD)) ; 253410d674a8SSarah Sharp } 253510d674a8SSarah Sharp 25361da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 253775d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 25381da177e4SLinus Torvalds { 25391da177e4SLinus Torvalds int delay_time, ret; 25401da177e4SLinus Torvalds u16 portstatus; 25411da177e4SLinus Torvalds u16 portchange; 25421da177e4SLinus Torvalds 25431da177e4SLinus Torvalds for (delay_time = 0; 25441da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 25451da177e4SLinus Torvalds delay_time += delay) { 25461da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 25471da177e4SLinus Torvalds msleep(delay); 25481da177e4SLinus Torvalds 25491da177e4SLinus Torvalds /* read and decode port status */ 25501da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 25511da177e4SLinus Torvalds if (ret < 0) 25521da177e4SLinus Torvalds return ret; 25531da177e4SLinus Torvalds 25544f43447eSSarah Sharp /* The port state is unknown until the reset completes. */ 2555470f0be8SSarah Sharp if (!(portstatus & USB_PORT_STAT_RESET)) 2556470f0be8SSarah Sharp break; 2557470f0be8SSarah Sharp 2558470f0be8SSarah Sharp /* switch to the long delay after two short delay failures */ 2559470f0be8SSarah Sharp if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 2560470f0be8SSarah Sharp delay = HUB_LONG_RESET_TIME; 2561470f0be8SSarah Sharp 2562470f0be8SSarah Sharp dev_dbg (hub->intfdev, 2563470f0be8SSarah Sharp "port %d not %sreset yet, waiting %dms\n", 2564470f0be8SSarah Sharp port1, warm ? "warm " : "", delay); 2565470f0be8SSarah Sharp } 2566470f0be8SSarah Sharp 25674f43447eSSarah Sharp if ((portstatus & USB_PORT_STAT_RESET)) 2568470f0be8SSarah Sharp return -EBUSY; 25694f43447eSSarah Sharp 2570a24a6078SSarah Sharp if (hub_port_warm_reset_required(hub, portstatus)) 2571a24a6078SSarah Sharp return -ENOTCONN; 257210d674a8SSarah Sharp 25731da177e4SLinus Torvalds /* Device went away? */ 25741da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 25751da177e4SLinus Torvalds return -ENOTCONN; 25761da177e4SLinus Torvalds 2577a24a6078SSarah Sharp /* bomb out completely if the connection bounced. A USB 3.0 2578a24a6078SSarah Sharp * connection may bounce if multiple warm resets were issued, 2579a24a6078SSarah Sharp * but the device may have successfully re-connected. Ignore it. 2580a24a6078SSarah Sharp */ 2581a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev) && 2582a24a6078SSarah Sharp (portchange & USB_PORT_STAT_C_CONNECTION)) 2583dd4dd19eSAlan Stern return -ENOTCONN; 25841da177e4SLinus Torvalds 2585470f0be8SSarah Sharp if (!(portstatus & USB_PORT_STAT_ENABLE)) 2586470f0be8SSarah Sharp return -EBUSY; 2587470f0be8SSarah Sharp 25882d4fa940SSarah Sharp if (!udev) 25892d4fa940SSarah Sharp return 0; 25902d4fa940SSarah Sharp 25910165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 2592551cdbbeSGreg Kroah-Hartman udev->speed = USB_SPEED_WIRELESS; 2593131dec34SSarah Sharp else if (hub_is_superspeed(hub->hdev)) 2594809cd1cbSSarah Sharp udev->speed = USB_SPEED_SUPER; 25950165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 25961da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 25971da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 25981da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 25991da177e4SLinus Torvalds else 26001da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 26011da177e4SLinus Torvalds return 0; 26021da177e4SLinus Torvalds } 26031da177e4SLinus Torvalds 260475d7cf72SAndiry Xu static void hub_port_finish_reset(struct usb_hub *hub, int port1, 2605a24a6078SSarah Sharp struct usb_device *udev, int *status) 26061da177e4SLinus Torvalds { 260775d7cf72SAndiry Xu switch (*status) { 26081da177e4SLinus Torvalds case 0: 2609b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 2610b789696aSDavid Brownell msleep(10 + 40); 26112d4fa940SSarah Sharp if (udev) { 2612a24a6078SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2613a24a6078SSarah Sharp 26143b29b68bSAlan Stern update_devnum(udev, 0); 2615a24a6078SSarah Sharp /* The xHC may think the device is already reset, 2616a24a6078SSarah Sharp * so ignore the status. 26178b8132bcSSarah Sharp */ 26188b8132bcSSarah Sharp if (hcd->driver->reset_device) 26198b8132bcSSarah Sharp hcd->driver->reset_device(hcd, udev); 262075d7cf72SAndiry Xu } 26211da177e4SLinus Torvalds /* FALL THROUGH */ 26221da177e4SLinus Torvalds case -ENOTCONN: 26231da177e4SLinus Torvalds case -ENODEV: 2624ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, 26251da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 26261c7439c6SSarah Sharp if (hub_is_superspeed(hub->hdev)) { 2627ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 262875d7cf72SAndiry Xu USB_PORT_FEAT_C_BH_PORT_RESET); 2629ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 263075d7cf72SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 2631ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2632a24a6078SSarah Sharp USB_PORT_FEAT_C_CONNECTION); 26331c7439c6SSarah Sharp } 2634a24a6078SSarah Sharp if (udev) 263575d7cf72SAndiry Xu usb_set_device_state(udev, *status 26361da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 26371da177e4SLinus Torvalds : USB_STATE_DEFAULT); 263875d7cf72SAndiry Xu break; 263975d7cf72SAndiry Xu } 264075d7cf72SAndiry Xu } 264175d7cf72SAndiry Xu 264275d7cf72SAndiry Xu /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ 264375d7cf72SAndiry Xu static int hub_port_reset(struct usb_hub *hub, int port1, 264475d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 264575d7cf72SAndiry Xu { 264675d7cf72SAndiry Xu int i, status; 2647a24a6078SSarah Sharp u16 portchange, portstatus; 264875d7cf72SAndiry Xu 264975d7cf72SAndiry Xu if (!hub_is_superspeed(hub->hdev)) { 26500fe51aa5SSarah Sharp if (warm) { 265175d7cf72SAndiry Xu dev_err(hub->intfdev, "only USB3 hub support " 265275d7cf72SAndiry Xu "warm reset\n"); 265375d7cf72SAndiry Xu return -EINVAL; 265475d7cf72SAndiry Xu } 26550fe51aa5SSarah Sharp /* Block EHCI CF initialization during the port reset. 26560fe51aa5SSarah Sharp * Some companion controllers don't like it when they mix. 26570fe51aa5SSarah Sharp */ 26580fe51aa5SSarah Sharp down_read(&ehci_cf_port_reset_rwsem); 2659d3b9d7a9SSarah Sharp } else if (!warm) { 2660d3b9d7a9SSarah Sharp /* 2661d3b9d7a9SSarah Sharp * If the caller hasn't explicitly requested a warm reset, 2662d3b9d7a9SSarah Sharp * double check and see if one is needed. 2663d3b9d7a9SSarah Sharp */ 2664d3b9d7a9SSarah Sharp status = hub_port_status(hub, port1, 2665d3b9d7a9SSarah Sharp &portstatus, &portchange); 2666d3b9d7a9SSarah Sharp if (status < 0) 2667d3b9d7a9SSarah Sharp goto done; 2668d3b9d7a9SSarah Sharp 2669d3b9d7a9SSarah Sharp if (hub_port_warm_reset_required(hub, portstatus)) 2670d3b9d7a9SSarah Sharp warm = true; 267175d7cf72SAndiry Xu } 267275d7cf72SAndiry Xu 267375d7cf72SAndiry Xu /* Reset the port */ 267475d7cf72SAndiry Xu for (i = 0; i < PORT_RESET_TRIES; i++) { 267575d7cf72SAndiry Xu status = set_port_feature(hub->hdev, port1, (warm ? 267675d7cf72SAndiry Xu USB_PORT_FEAT_BH_PORT_RESET : 267775d7cf72SAndiry Xu USB_PORT_FEAT_RESET)); 2678e9e88fb7SAlan Stern if (status == -ENODEV) { 2679e9e88fb7SAlan Stern ; /* The hub is gone */ 2680e9e88fb7SAlan Stern } else if (status) { 268175d7cf72SAndiry Xu dev_err(hub->intfdev, 268275d7cf72SAndiry Xu "cannot %sreset port %d (err = %d)\n", 268375d7cf72SAndiry Xu warm ? "warm " : "", port1, status); 268475d7cf72SAndiry Xu } else { 268575d7cf72SAndiry Xu status = hub_port_wait_reset(hub, port1, udev, delay, 268675d7cf72SAndiry Xu warm); 2687e9e88fb7SAlan Stern if (status && status != -ENOTCONN && status != -ENODEV) 268875d7cf72SAndiry Xu dev_dbg(hub->intfdev, 268975d7cf72SAndiry Xu "port_wait_reset: err = %d\n", 269075d7cf72SAndiry Xu status); 269175d7cf72SAndiry Xu } 269275d7cf72SAndiry Xu 2693a24a6078SSarah Sharp /* Check for disconnect or reset */ 269475d7cf72SAndiry Xu if (status == 0 || status == -ENOTCONN || status == -ENODEV) { 2695a24a6078SSarah Sharp hub_port_finish_reset(hub, port1, udev, &status); 2696a24a6078SSarah Sharp 2697a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 269832fe0198SAlan Stern goto done; 2699a24a6078SSarah Sharp 2700a24a6078SSarah Sharp /* 2701a24a6078SSarah Sharp * If a USB 3.0 device migrates from reset to an error 2702a24a6078SSarah Sharp * state, re-issue the warm reset. 2703a24a6078SSarah Sharp */ 2704a24a6078SSarah Sharp if (hub_port_status(hub, port1, 2705a24a6078SSarah Sharp &portstatus, &portchange) < 0) 2706a24a6078SSarah Sharp goto done; 2707a24a6078SSarah Sharp 2708a24a6078SSarah Sharp if (!hub_port_warm_reset_required(hub, portstatus)) 2709a24a6078SSarah Sharp goto done; 2710a24a6078SSarah Sharp 2711a24a6078SSarah Sharp /* 2712a24a6078SSarah Sharp * If the port is in SS.Inactive or Compliance Mode, the 2713a24a6078SSarah Sharp * hot or warm reset failed. Try another warm reset. 2714a24a6078SSarah Sharp */ 2715a24a6078SSarah Sharp if (!warm) { 2716a24a6078SSarah Sharp dev_dbg(hub->intfdev, "hot reset failed, warm reset port %d\n", 2717a24a6078SSarah Sharp port1); 2718a24a6078SSarah Sharp warm = true; 2719a24a6078SSarah Sharp } 27201da177e4SLinus Torvalds } 27211da177e4SLinus Torvalds 27221da177e4SLinus Torvalds dev_dbg (hub->intfdev, 272375d7cf72SAndiry Xu "port %d not enabled, trying %sreset again...\n", 272475d7cf72SAndiry Xu port1, warm ? "warm " : ""); 27251da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 27261da177e4SLinus Torvalds } 27271da177e4SLinus Torvalds 27281da177e4SLinus Torvalds dev_err (hub->intfdev, 27291da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 27301da177e4SLinus Torvalds port1); 27311da177e4SLinus Torvalds 273232fe0198SAlan Stern done: 27330fe51aa5SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 273432fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 273575d7cf72SAndiry Xu 27361da177e4SLinus Torvalds return status; 27371da177e4SLinus Torvalds } 27381da177e4SLinus Torvalds 27390ed9a57eSAndiry Xu /* Check if a port is power on */ 27400ed9a57eSAndiry Xu static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) 27410ed9a57eSAndiry Xu { 27420ed9a57eSAndiry Xu int ret = 0; 27430ed9a57eSAndiry Xu 27440ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 27450ed9a57eSAndiry Xu if (portstatus & USB_SS_PORT_STAT_POWER) 27460ed9a57eSAndiry Xu ret = 1; 27470ed9a57eSAndiry Xu } else { 27480ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_POWER) 27490ed9a57eSAndiry Xu ret = 1; 27500ed9a57eSAndiry Xu } 27510ed9a57eSAndiry Xu 27520ed9a57eSAndiry Xu return ret; 27530ed9a57eSAndiry Xu } 27540ed9a57eSAndiry Xu 2755d388dab7SAlan Stern #ifdef CONFIG_PM 27561da177e4SLinus Torvalds 27570ed9a57eSAndiry Xu /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ 27580ed9a57eSAndiry Xu static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) 27590ed9a57eSAndiry Xu { 27600ed9a57eSAndiry Xu int ret = 0; 27610ed9a57eSAndiry Xu 27620ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 27630ed9a57eSAndiry Xu if ((portstatus & USB_PORT_STAT_LINK_STATE) 27640ed9a57eSAndiry Xu == USB_SS_PORT_LS_U3) 27650ed9a57eSAndiry Xu ret = 1; 27660ed9a57eSAndiry Xu } else { 27670ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_SUSPEND) 27680ed9a57eSAndiry Xu ret = 1; 27690ed9a57eSAndiry Xu } 27700ed9a57eSAndiry Xu 27710ed9a57eSAndiry Xu return ret; 27720ed9a57eSAndiry Xu } 2773b01b03f3SAlan Stern 2774b01b03f3SAlan Stern /* Determine whether the device on a port is ready for a normal resume, 2775b01b03f3SAlan Stern * is ready for a reset-resume, or should be disconnected. 2776b01b03f3SAlan Stern */ 2777b01b03f3SAlan Stern static int check_port_resume_type(struct usb_device *udev, 2778b01b03f3SAlan Stern struct usb_hub *hub, int port1, 2779b01b03f3SAlan Stern int status, unsigned portchange, unsigned portstatus) 2780b01b03f3SAlan Stern { 2781b01b03f3SAlan Stern /* Is the device still present? */ 27820ed9a57eSAndiry Xu if (status || port_is_suspended(hub, portstatus) || 27830ed9a57eSAndiry Xu !port_is_power_on(hub, portstatus) || 27840ed9a57eSAndiry Xu !(portstatus & USB_PORT_STAT_CONNECTION)) { 2785b01b03f3SAlan Stern if (status >= 0) 2786b01b03f3SAlan Stern status = -ENODEV; 2787b01b03f3SAlan Stern } 2788b01b03f3SAlan Stern 278986c57edfSAlan Stern /* Can't do a normal resume if the port isn't enabled, 279086c57edfSAlan Stern * so try a reset-resume instead. 279186c57edfSAlan Stern */ 279286c57edfSAlan Stern else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { 279386c57edfSAlan Stern if (udev->persist_enabled) 279486c57edfSAlan Stern udev->reset_resume = 1; 279586c57edfSAlan Stern else 2796b01b03f3SAlan Stern status = -ENODEV; 279786c57edfSAlan Stern } 2798b01b03f3SAlan Stern 2799b01b03f3SAlan Stern if (status) { 2800b01b03f3SAlan Stern dev_dbg(hub->intfdev, 2801b01b03f3SAlan Stern "port %d status %04x.%04x after resume, %d\n", 2802b01b03f3SAlan Stern port1, portchange, portstatus, status); 2803b01b03f3SAlan Stern } else if (udev->reset_resume) { 2804b01b03f3SAlan Stern 2805b01b03f3SAlan Stern /* Late port handoff can set status-change bits */ 2806b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) 2807ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2808b01b03f3SAlan Stern USB_PORT_FEAT_C_CONNECTION); 2809b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) 2810ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2811b01b03f3SAlan Stern USB_PORT_FEAT_C_ENABLE); 2812b01b03f3SAlan Stern } 2813b01b03f3SAlan Stern 2814b01b03f3SAlan Stern return status; 2815b01b03f3SAlan Stern } 2816b01b03f3SAlan Stern 2817f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 2818f74631e3SSarah Sharp { 2819f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2820f74631e3SSarah Sharp 2821f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 2822f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 2823f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 2824f74631e3SSarah Sharp return 0; 2825f74631e3SSarah Sharp 2826f74631e3SSarah Sharp /* Clear Feature LTM Enable can only be sent if the device is 2827f74631e3SSarah Sharp * configured. 2828f74631e3SSarah Sharp */ 2829f74631e3SSarah Sharp if (!udev->actconfig) 2830f74631e3SSarah Sharp return 0; 2831f74631e3SSarah Sharp 2832f74631e3SSarah Sharp return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2833f74631e3SSarah Sharp USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 2834f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 2835f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 2836f74631e3SSarah Sharp } 2837f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 2838f74631e3SSarah Sharp 2839f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) 2840f74631e3SSarah Sharp { 2841f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2842f74631e3SSarah Sharp 2843f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 2844f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 2845f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 2846f74631e3SSarah Sharp return; 2847f74631e3SSarah Sharp 2848f74631e3SSarah Sharp /* Set Feature LTM Enable can only be sent if the device is 2849f74631e3SSarah Sharp * configured. 2850f74631e3SSarah Sharp */ 2851f74631e3SSarah Sharp if (!udev->actconfig) 2852f74631e3SSarah Sharp return; 2853f74631e3SSarah Sharp 2854f74631e3SSarah Sharp usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2855f74631e3SSarah Sharp USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 2856f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 2857f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 2858f74631e3SSarah Sharp } 2859f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 2860f74631e3SSarah Sharp 286154a3ac0cSLan Tianyu /* 286228e86165SAlan Stern * usb_enable_remote_wakeup - enable remote wakeup for a device 286354a3ac0cSLan Tianyu * @udev: target device 286454a3ac0cSLan Tianyu * 286528e86165SAlan Stern * For USB-2 devices: Set the device's remote wakeup feature. 286628e86165SAlan Stern * 286728e86165SAlan Stern * For USB-3 devices: Assume there's only one function on the device and 286828e86165SAlan Stern * enable remote wake for the first interface. FIXME if the interface 286928e86165SAlan Stern * association descriptor shows there's more than one function. 287054a3ac0cSLan Tianyu */ 287128e86165SAlan Stern static int usb_enable_remote_wakeup(struct usb_device *udev) 287254a3ac0cSLan Tianyu { 287328e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) 287428e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 287528e86165SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 287628e86165SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, 287728e86165SAlan Stern USB_CTRL_SET_TIMEOUT); 287828e86165SAlan Stern else 287928e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 288028e86165SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, 288128e86165SAlan Stern USB_INTRF_FUNC_SUSPEND, 288228e86165SAlan Stern USB_INTRF_FUNC_SUSPEND_RW | 288328e86165SAlan Stern USB_INTRF_FUNC_SUSPEND_LP, 288428e86165SAlan Stern NULL, 0, USB_CTRL_SET_TIMEOUT); 288528e86165SAlan Stern } 288628e86165SAlan Stern 288728e86165SAlan Stern /* 288828e86165SAlan Stern * usb_disable_remote_wakeup - disable remote wakeup for a device 288928e86165SAlan Stern * @udev: target device 289028e86165SAlan Stern * 289128e86165SAlan Stern * For USB-2 devices: Clear the device's remote wakeup feature. 289228e86165SAlan Stern * 289328e86165SAlan Stern * For USB-3 devices: Assume there's only one function on the device and 289428e86165SAlan Stern * disable remote wake for the first interface. FIXME if the interface 289528e86165SAlan Stern * association descriptor shows there's more than one function. 289628e86165SAlan Stern */ 289728e86165SAlan Stern static int usb_disable_remote_wakeup(struct usb_device *udev) 289828e86165SAlan Stern { 289928e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) 290028e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 290128e86165SAlan Stern USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 290228e86165SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, 290328e86165SAlan Stern USB_CTRL_SET_TIMEOUT); 290428e86165SAlan Stern else 290554a3ac0cSLan Tianyu return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 290654a3ac0cSLan Tianyu USB_REQ_CLEAR_FEATURE, USB_RECIP_INTERFACE, 290754a3ac0cSLan Tianyu USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, 290854a3ac0cSLan Tianyu USB_CTRL_SET_TIMEOUT); 290954a3ac0cSLan Tianyu } 29101da177e4SLinus Torvalds 2911e583d9dbSAlan Stern /* Count of wakeup-enabled devices at or below udev */ 2912e583d9dbSAlan Stern static unsigned wakeup_enabled_descendants(struct usb_device *udev) 2913e583d9dbSAlan Stern { 2914e583d9dbSAlan Stern struct usb_hub *hub = usb_hub_to_struct_hub(udev); 2915e583d9dbSAlan Stern 2916e583d9dbSAlan Stern return udev->do_remote_wakeup + 2917e583d9dbSAlan Stern (hub ? hub->wakeup_enabled_descendants : 0); 2918e583d9dbSAlan Stern } 2919e583d9dbSAlan Stern 29201da177e4SLinus Torvalds /* 2921140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 2922624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 29235edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 29241da177e4SLinus Torvalds * 29251da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 29261da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 29271da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 2928140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 29291da177e4SLinus Torvalds * to disconnect devices while they are suspended. 29301da177e4SLinus Torvalds * 2931390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 2932390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 2933390a8c34SDavid Brownell * 2934624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 2935624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 2936624d6c07SAlan Stern * All devices below the suspended port are also suspended. 2937624d6c07SAlan Stern * 2938624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 2939624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 2940624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 2941624d6c07SAlan Stern * some cases, this wakes the USB host. 2942624d6c07SAlan Stern * 29431da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 29441da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 29451da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 29461da177e4SLinus Torvalds * 29474956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 29484956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 29494956eccdSAlan Stern * State transitions include: 29504956eccdSAlan Stern * 29514956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 29524956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 29534956eccdSAlan Stern * 29544956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 29554956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 29564956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 29574956eccdSAlan Stern * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 29584956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 29594956eccdSAlan Stern * 2960e583d9dbSAlan Stern * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get 2961e583d9dbSAlan Stern * suspended until their bus goes into global suspend (i.e., the root 29620aa2832dSAlan Stern * hub is suspended). Nevertheless, we change @udev->state to 29630aa2832dSAlan Stern * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual 29640aa2832dSAlan Stern * upstream port setting is stored in @udev->port_is_suspended. 29654956eccdSAlan Stern * 29661da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 29671da177e4SLinus Torvalds */ 296865bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 29691da177e4SLinus Torvalds { 2970ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2971ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 2972624d6c07SAlan Stern int port1 = udev->portnum; 2973624d6c07SAlan Stern int status; 29740aa2832dSAlan Stern bool really_suspend = true; 29754956eccdSAlan Stern 2976624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 2977624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 2978624d6c07SAlan Stern * 2979624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 2980624d6c07SAlan Stern * we don't explicitly enable it here. 2981624d6c07SAlan Stern */ 2982624d6c07SAlan Stern if (udev->do_remote_wakeup) { 298328e86165SAlan Stern status = usb_enable_remote_wakeup(udev); 29840c487206SOliver Neukum if (status) { 2985624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 2986624d6c07SAlan Stern status); 29870c487206SOliver Neukum /* bail if autosuspend is requested */ 29885b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 29894fae6f0fSAlan Stern goto err_wakeup; 29900c487206SOliver Neukum } 2991624d6c07SAlan Stern } 2992624d6c07SAlan Stern 299365580b43SAndiry Xu /* disable USB2 hardware LPM */ 299465580b43SAndiry Xu if (udev->usb2_hw_lpm_enabled == 1) 299565580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 0); 299665580b43SAndiry Xu 2997f74631e3SSarah Sharp if (usb_disable_ltm(udev)) { 29984fae6f0fSAlan Stern dev_err(&udev->dev, "Failed to disable LTM before suspend\n."); 29994fae6f0fSAlan Stern status = -ENOMEM; 30004fae6f0fSAlan Stern if (PMSG_IS_AUTO(msg)) 30014fae6f0fSAlan Stern goto err_ltm; 3002f74631e3SSarah Sharp } 30038306095fSSarah Sharp if (usb_unlocked_disable_lpm(udev)) { 30044fae6f0fSAlan Stern dev_err(&udev->dev, "Failed to disable LPM before suspend\n."); 30054fae6f0fSAlan Stern status = -ENOMEM; 30064fae6f0fSAlan Stern if (PMSG_IS_AUTO(msg)) 30074fae6f0fSAlan Stern goto err_lpm3; 30088306095fSSarah Sharp } 30098306095fSSarah Sharp 3010624d6c07SAlan Stern /* see 7.1.7.6 */ 3011a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3012c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); 3013e583d9dbSAlan Stern 30140aa2832dSAlan Stern /* 30150aa2832dSAlan Stern * For system suspend, we do not need to enable the suspend feature 30160aa2832dSAlan Stern * on individual USB-2 ports. The devices will automatically go 30170aa2832dSAlan Stern * into suspend a few ms after the root hub stops sending packets. 30180aa2832dSAlan Stern * The USB 2.0 spec calls this "global suspend". 3019e583d9dbSAlan Stern * 3020e583d9dbSAlan Stern * However, many USB hubs have a bug: They don't relay wakeup requests 3021e583d9dbSAlan Stern * from a downstream port if the port's suspend feature isn't on. 3022e583d9dbSAlan Stern * Therefore we will turn on the suspend feature if udev or any of its 3023e583d9dbSAlan Stern * descendants is enabled for remote wakeup. 30240aa2832dSAlan Stern */ 3025e583d9dbSAlan Stern else if (PMSG_IS_AUTO(msg) || wakeup_enabled_descendants(udev) > 0) 3026e583d9dbSAlan Stern status = set_port_feature(hub->hdev, port1, 3027e583d9dbSAlan Stern USB_PORT_FEAT_SUSPEND); 30280aa2832dSAlan Stern else { 30290aa2832dSAlan Stern really_suspend = false; 30300aa2832dSAlan Stern status = 0; 30310aa2832dSAlan Stern } 3032624d6c07SAlan Stern if (status) { 3033624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", 3034624d6c07SAlan Stern port1, status); 3035cbb33004SAlan Stern 30364fae6f0fSAlan Stern /* Try to enable USB3 LPM and LTM again */ 30374fae6f0fSAlan Stern usb_unlocked_enable_lpm(udev); 30384fae6f0fSAlan Stern err_lpm3: 30394fae6f0fSAlan Stern usb_enable_ltm(udev); 30404fae6f0fSAlan Stern err_ltm: 3041c3e751e4SAndiry Xu /* Try to enable USB2 hardware LPM again */ 3042c3e751e4SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 3043c3e751e4SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 3044c3e751e4SAndiry Xu 30454fae6f0fSAlan Stern if (udev->do_remote_wakeup) 30464fae6f0fSAlan Stern (void) usb_disable_remote_wakeup(udev); 30474fae6f0fSAlan Stern err_wakeup: 30488306095fSSarah Sharp 3049cbb33004SAlan Stern /* System sleep transitions should never fail */ 30505b1b0b81SAlan Stern if (!PMSG_IS_AUTO(msg)) 3051cbb33004SAlan Stern status = 0; 3052624d6c07SAlan Stern } else { 305330b1a7a3SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", 305430b1a7a3SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : ""), 305530b1a7a3SAlan Stern udev->do_remote_wakeup); 30560aa2832dSAlan Stern if (really_suspend) { 3057bfd1e910SAlan Stern udev->port_is_suspended = 1; 3058e583d9dbSAlan Stern 3059e583d9dbSAlan Stern /* device has up to 10 msec to fully suspend */ 3060624d6c07SAlan Stern msleep(10); 3061624d6c07SAlan Stern } 3062e583d9dbSAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 30630aa2832dSAlan Stern } 3064ad493e5eSLan Tianyu 30654fae6f0fSAlan Stern if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled) { 3066ad493e5eSLan Tianyu pm_runtime_put_sync(&port_dev->dev); 3067ad493e5eSLan Tianyu port_dev->did_runtime_put = true; 3068ad493e5eSLan Tianyu } 3069ad493e5eSLan Tianyu 3070c08512c7SAlan Stern usb_mark_last_busy(hub->hdev); 30714956eccdSAlan Stern return status; 30721da177e4SLinus Torvalds } 3073f3f3253dSDavid Brownell 30741da177e4SLinus Torvalds /* 3075390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 3076390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 307754515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 30781da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 30791da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 30801da177e4SLinus Torvalds * in the tree that's rooted at this device. 308154515fe5SAlan Stern * 308254515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 308354515fe5SAlan Stern * status check is done. 30841da177e4SLinus Torvalds */ 3085140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 30861da177e4SLinus Torvalds { 308754515fe5SAlan Stern int status = 0; 308807e72b95SOliver Neukum u16 devstatus = 0; 30891da177e4SLinus Torvalds 30901da177e4SLinus Torvalds /* caller owns the udev device lock */ 3091b9cef6c3SWu Fengguang dev_dbg(&udev->dev, "%s\n", 3092b9cef6c3SWu Fengguang udev->reset_resume ? "finish reset-resume" : "finish resume"); 30931da177e4SLinus Torvalds 30941da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 30951da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 30961da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 30971da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 30981da177e4SLinus Torvalds */ 30991da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 31001da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 31011da177e4SLinus Torvalds : USB_STATE_ADDRESS); 31021da177e4SLinus Torvalds 310354515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 310454515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 310554515fe5SAlan Stern * operation is carried out here, after the port has been 310654515fe5SAlan Stern * resumed. 310754515fe5SAlan Stern */ 31081d10255cSAlan Stern if (udev->reset_resume) { 31091d10255cSAlan Stern /* 31101d10255cSAlan Stern * If the device morphs or switches modes when it is reset, 31111d10255cSAlan Stern * we don't want to perform a reset-resume. We'll fail the 31121d10255cSAlan Stern * resume, which will cause a logical disconnect, and then 31131d10255cSAlan Stern * the device will be rediscovered. 31141d10255cSAlan Stern */ 311586c57edfSAlan Stern retry_reset_resume: 31161d10255cSAlan Stern if (udev->quirks & USB_QUIRK_RESET) 31171d10255cSAlan Stern status = -ENODEV; 31181d10255cSAlan Stern else 3119742120c6SMing Lei status = usb_reset_and_verify_device(udev); 31201d10255cSAlan Stern } 312154515fe5SAlan Stern 31221da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 31231da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 31241da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 31251da177e4SLinus Torvalds */ 312654515fe5SAlan Stern if (status == 0) { 312746dede46SAlan Stern devstatus = 0; 31281da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 312986c57edfSAlan Stern 313086c57edfSAlan Stern /* If a normal resume failed, try doing a reset-resume */ 313186c57edfSAlan Stern if (status && !udev->reset_resume && udev->persist_enabled) { 313286c57edfSAlan Stern dev_dbg(&udev->dev, "retry with reset-resume\n"); 313386c57edfSAlan Stern udev->reset_resume = 1; 313486c57edfSAlan Stern goto retry_reset_resume; 313586c57edfSAlan Stern } 313654515fe5SAlan Stern } 3137b40b7a90SAlan Stern 3138624d6c07SAlan Stern if (status) { 3139624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 31401da177e4SLinus Torvalds status); 314107e72b95SOliver Neukum /* 314207e72b95SOliver Neukum * There are a few quirky devices which violate the standard 314307e72b95SOliver Neukum * by claiming to have remote wakeup enabled after a reset, 314407e72b95SOliver Neukum * which crash if the feature is cleared, hence check for 314507e72b95SOliver Neukum * udev->reset_resume 314607e72b95SOliver Neukum */ 314707e72b95SOliver Neukum } else if (udev->actconfig && !udev->reset_resume) { 314828e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) { 314954a3ac0cSLan Tianyu if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) 315028e86165SAlan Stern status = usb_disable_remote_wakeup(udev); 315154a3ac0cSLan Tianyu } else { 315254a3ac0cSLan Tianyu status = usb_get_status(udev, USB_RECIP_INTERFACE, 0, 315354a3ac0cSLan Tianyu &devstatus); 315454a3ac0cSLan Tianyu if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP 315554a3ac0cSLan Tianyu | USB_INTRF_STAT_FUNC_RW)) 315628e86165SAlan Stern status = usb_disable_remote_wakeup(udev); 315754a3ac0cSLan Tianyu } 315854a3ac0cSLan Tianyu 3159a8e7c565SAlan Stern if (status) 3160b9cef6c3SWu Fengguang dev_dbg(&udev->dev, 3161b9cef6c3SWu Fengguang "disable remote wakeup, status %d\n", 3162b9cef6c3SWu Fengguang status); 31631da177e4SLinus Torvalds status = 0; 31641da177e4SLinus Torvalds } 31651da177e4SLinus Torvalds return status; 31661da177e4SLinus Torvalds } 31671da177e4SLinus Torvalds 3168624d6c07SAlan Stern /* 3169624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 3170624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 3171624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 3172624d6c07SAlan Stern * 3173624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 3174624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 3175624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 3176624d6c07SAlan Stern * the host and the device is the same as it was when the device 3177624d6c07SAlan Stern * suspended. 3178624d6c07SAlan Stern * 3179feccc30dSAlan Stern * If @udev->reset_resume is set then this routine won't check that the 3180feccc30dSAlan Stern * port is still enabled. Furthermore, finish_port_resume() above will 318154515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 318254515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 318354515fe5SAlan Stern * 318454515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 318554515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 318654515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 318754515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 318854515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 318954515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 319054515fe5SAlan Stern * made to appear as if it had not disconnected. 319154515fe5SAlan Stern * 3192742120c6SMing Lei * This facility can be dangerous. Although usb_reset_and_verify_device() makes 3193feccc30dSAlan Stern * every effort to insure that the same device is present after the 319454515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 319554515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 319654515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 319754515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 319854515fe5SAlan Stern * new card is corrupted and the system crashes. 319954515fe5SAlan Stern * 3200624d6c07SAlan Stern * Returns 0 on success, else negative errno. 3201624d6c07SAlan Stern */ 320265bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 32031da177e4SLinus Torvalds { 3204ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 3205ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 3206624d6c07SAlan Stern int port1 = udev->portnum; 32071da177e4SLinus Torvalds int status; 3208d25450c6SAlan Stern u16 portchange, portstatus; 3209d25450c6SAlan Stern 3210ad493e5eSLan Tianyu if (port_dev->did_runtime_put) { 3211ad493e5eSLan Tianyu status = pm_runtime_get_sync(&port_dev->dev); 3212ad493e5eSLan Tianyu port_dev->did_runtime_put = false; 3213ad493e5eSLan Tianyu if (status < 0) { 3214ad493e5eSLan Tianyu dev_dbg(&udev->dev, "can't resume usb port, status %d\n", 3215ad493e5eSLan Tianyu status); 3216ad493e5eSLan Tianyu return status; 3217ad493e5eSLan Tianyu } 3218ad493e5eSLan Tianyu } 3219ad493e5eSLan Tianyu 3220d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 3221d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 32220ed9a57eSAndiry Xu if (status == 0 && !port_is_suspended(hub, portstatus)) 3223d25450c6SAlan Stern goto SuspendCleared; 32241da177e4SLinus Torvalds 3225781b2137SMatthias Beyer /* dev_dbg(hub->intfdev, "resume port %d\n", port1); */ 32261da177e4SLinus Torvalds 3227d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 3228d5cbad4bSAlan Stern 32291da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 3230a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3231c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); 3232a7114230SAndiry Xu else 3233ad493e5eSLan Tianyu status = usb_clear_port_feature(hub->hdev, 32341da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 32351da177e4SLinus Torvalds if (status) { 3236624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", 32371da177e4SLinus Torvalds port1, status); 32381da177e4SLinus Torvalds } else { 32391da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 3240645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 32415b1b0b81SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : "")); 32421da177e4SLinus Torvalds msleep(25); 32431da177e4SLinus Torvalds 32441da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 32451da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 32461da177e4SLinus Torvalds * sequence. 32471da177e4SLinus Torvalds */ 3248d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 324954515fe5SAlan Stern 32501da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 32511da177e4SLinus Torvalds msleep(10); 32521da177e4SLinus Torvalds } 3253b01b03f3SAlan Stern 3254b01b03f3SAlan Stern SuspendCleared: 3255b01b03f3SAlan Stern if (status == 0) { 3256bfd1e910SAlan Stern udev->port_is_suspended = 0; 3257a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) { 3258a7114230SAndiry Xu if (portchange & USB_PORT_STAT_C_LINK_STATE) 3259ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3260a7114230SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 3261a7114230SAndiry Xu } else { 3262b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 3263ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3264b01b03f3SAlan Stern USB_PORT_FEAT_C_SUSPEND); 32651da177e4SLinus Torvalds } 3266a7114230SAndiry Xu } 32671da177e4SLinus Torvalds 3268d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 3269d5cbad4bSAlan Stern 3270b01b03f3SAlan Stern status = check_port_resume_type(udev, 3271b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 327254515fe5SAlan Stern if (status == 0) 327354515fe5SAlan Stern status = finish_port_resume(udev); 327454515fe5SAlan Stern if (status < 0) { 327554515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 327654515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 327765580b43SAndiry Xu } else { 327865580b43SAndiry Xu /* Try to enable USB2 hardware LPM */ 327965580b43SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 328065580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 32818306095fSSarah Sharp 3282f74631e3SSarah Sharp /* Try to enable USB3 LTM and LPM */ 3283f74631e3SSarah Sharp usb_enable_ltm(udev); 32848306095fSSarah Sharp usb_unlocked_enable_lpm(udev); 328554515fe5SAlan Stern } 328665580b43SAndiry Xu 32871da177e4SLinus Torvalds return status; 32881da177e4SLinus Torvalds } 32891da177e4SLinus Torvalds 329084ebc102SAlan Stern #ifdef CONFIG_PM_RUNTIME 329184ebc102SAlan Stern 32928808f00cSAlan Stern /* caller has locked udev */ 32930534d468SAlan Stern int usb_remote_wakeup(struct usb_device *udev) 32941da177e4SLinus Torvalds { 32951da177e4SLinus Torvalds int status = 0; 32961da177e4SLinus Torvalds 32971da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 3298645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 32999bbdf1e0SAlan Stern status = usb_autoresume_device(udev); 33009bbdf1e0SAlan Stern if (status == 0) { 33019bbdf1e0SAlan Stern /* Let the drivers do their thing, then... */ 33029bbdf1e0SAlan Stern usb_autosuspend_device(udev); 33039bbdf1e0SAlan Stern } 3304d25450c6SAlan Stern } 33051da177e4SLinus Torvalds return status; 33061da177e4SLinus Torvalds } 33071da177e4SLinus Torvalds 3308d388dab7SAlan Stern #endif 3309d388dab7SAlan Stern 3310e6f30deaSMing Lei static int check_ports_changed(struct usb_hub *hub) 3311e6f30deaSMing Lei { 3312e6f30deaSMing Lei int port1; 3313e6f30deaSMing Lei 3314e6f30deaSMing Lei for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { 3315e6f30deaSMing Lei u16 portstatus, portchange; 3316e6f30deaSMing Lei int status; 3317e6f30deaSMing Lei 3318e6f30deaSMing Lei status = hub_port_status(hub, port1, &portstatus, &portchange); 3319e6f30deaSMing Lei if (!status && portchange) 3320e6f30deaSMing Lei return 1; 3321e6f30deaSMing Lei } 3322e6f30deaSMing Lei return 0; 3323e6f30deaSMing Lei } 3324e6f30deaSMing Lei 3325db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 33261da177e4SLinus Torvalds { 33271da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 33281da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 33291da177e4SLinus Torvalds unsigned port1; 33304296c70aSSarah Sharp int status; 33311da177e4SLinus Torvalds 3332e583d9dbSAlan Stern /* 3333e583d9dbSAlan Stern * Warn if children aren't already suspended. 3334e583d9dbSAlan Stern * Also, add up the number of wakeup-enabled descendants. 3335e583d9dbSAlan Stern */ 3336e583d9dbSAlan Stern hub->wakeup_enabled_descendants = 0; 33371da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 33381da177e4SLinus Torvalds struct usb_device *udev; 33391da177e4SLinus Torvalds 3340ff823c79SLan Tianyu udev = hub->ports[port1 - 1]->child; 33416840d255SAlan Stern if (udev && udev->can_submit) { 3342025d4430SRahul Bedarkar dev_warn(&intf->dev, "port %d not suspended yet\n", 3343025d4430SRahul Bedarkar port1); 33445b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 3345c9f89fa4SDavid Brownell return -EBUSY; 3346c9f89fa4SDavid Brownell } 3347e583d9dbSAlan Stern if (udev) 3348e583d9dbSAlan Stern hub->wakeup_enabled_descendants += 3349e583d9dbSAlan Stern wakeup_enabled_descendants(udev); 33501da177e4SLinus Torvalds } 3351e6f30deaSMing Lei 3352e6f30deaSMing Lei if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { 3353e6f30deaSMing Lei /* check if there are changes pending on hub ports */ 3354e6f30deaSMing Lei if (check_ports_changed(hub)) { 3355e6f30deaSMing Lei if (PMSG_IS_AUTO(msg)) 3356e6f30deaSMing Lei return -EBUSY; 3357e6f30deaSMing Lei pm_wakeup_event(&hdev->dev, 2000); 3358e6f30deaSMing Lei } 3359e6f30deaSMing Lei } 3360e6f30deaSMing Lei 33614296c70aSSarah Sharp if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { 33624296c70aSSarah Sharp /* Enable hub to send remote wakeup for all ports. */ 33634296c70aSSarah Sharp for (port1 = 1; port1 <= hdev->maxchild; port1++) { 33644296c70aSSarah Sharp status = set_port_feature(hdev, 33654296c70aSSarah Sharp port1 | 33664296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_CONNECT | 33674296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | 33684296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, 33694296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_MASK); 33704296c70aSSarah Sharp } 33714296c70aSSarah Sharp } 33721da177e4SLinus Torvalds 3373441b62c1SHarvey Harrison dev_dbg(&intf->dev, "%s\n", __func__); 337440f122f3SAlan Stern 3375c9f89fa4SDavid Brownell /* stop khubd and related activity */ 33764330354fSAlan Stern hub_quiesce(hub, HUB_SUSPEND); 3377b6f6436dSAlan Stern return 0; 33781da177e4SLinus Torvalds } 33791da177e4SLinus Torvalds 33801da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 33811da177e4SLinus Torvalds { 33821da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 33831da177e4SLinus Torvalds 33845e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3385f2835219SAlan Stern hub_activate(hub, HUB_RESUME); 33861da177e4SLinus Torvalds return 0; 33871da177e4SLinus Torvalds } 33881da177e4SLinus Torvalds 3389b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 3390f07600cfSAlan Stern { 3391b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 3392f07600cfSAlan Stern 33935e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3394f2835219SAlan Stern hub_activate(hub, HUB_RESET_RESUME); 3395f07600cfSAlan Stern return 0; 3396f07600cfSAlan Stern } 3397f07600cfSAlan Stern 339854515fe5SAlan Stern /** 339954515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 340054515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 340154515fe5SAlan Stern * 340254515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 340354515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 3404feccc30dSAlan Stern * has been reset. The routine marks @rhdev as having lost power. 3405feccc30dSAlan Stern * When the hub driver is resumed it will take notice and carry out 3406feccc30dSAlan Stern * power-session recovery for all the "USB-PERSIST"-enabled child devices; 3407feccc30dSAlan Stern * the others will be disconnected. 340854515fe5SAlan Stern */ 340954515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 341054515fe5SAlan Stern { 341154515fe5SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 341254515fe5SAlan Stern rhdev->reset_resume = 1; 341354515fe5SAlan Stern } 341454515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 341554515fe5SAlan Stern 34161ea7e0e8SSarah Sharp static const char * const usb3_lpm_names[] = { 34171ea7e0e8SSarah Sharp "U0", 34181ea7e0e8SSarah Sharp "U1", 34191ea7e0e8SSarah Sharp "U2", 34201ea7e0e8SSarah Sharp "U3", 34211ea7e0e8SSarah Sharp }; 34221ea7e0e8SSarah Sharp 34231ea7e0e8SSarah Sharp /* 34241ea7e0e8SSarah Sharp * Send a Set SEL control transfer to the device, prior to enabling 34251ea7e0e8SSarah Sharp * device-initiated U1 or U2. This lets the device know the exit latencies from 34261ea7e0e8SSarah Sharp * the time the device initiates a U1 or U2 exit, to the time it will receive a 34271ea7e0e8SSarah Sharp * packet from the host. 34281ea7e0e8SSarah Sharp * 34291ea7e0e8SSarah Sharp * This function will fail if the SEL or PEL values for udev are greater than 34301ea7e0e8SSarah Sharp * the maximum allowed values for the link state to be enabled. 34311ea7e0e8SSarah Sharp */ 34321ea7e0e8SSarah Sharp static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) 34331ea7e0e8SSarah Sharp { 34341ea7e0e8SSarah Sharp struct usb_set_sel_req *sel_values; 34351ea7e0e8SSarah Sharp unsigned long long u1_sel; 34361ea7e0e8SSarah Sharp unsigned long long u1_pel; 34371ea7e0e8SSarah Sharp unsigned long long u2_sel; 34381ea7e0e8SSarah Sharp unsigned long long u2_pel; 34391ea7e0e8SSarah Sharp int ret; 34401ea7e0e8SSarah Sharp 344138d7f688SXenia Ragiadakou if (udev->state != USB_STATE_CONFIGURED) 344238d7f688SXenia Ragiadakou return 0; 344338d7f688SXenia Ragiadakou 34441ea7e0e8SSarah Sharp /* Convert SEL and PEL stored in ns to us */ 34451ea7e0e8SSarah Sharp u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); 34461ea7e0e8SSarah Sharp u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); 34471ea7e0e8SSarah Sharp u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); 34481ea7e0e8SSarah Sharp u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); 34491ea7e0e8SSarah Sharp 34501ea7e0e8SSarah Sharp /* 34511ea7e0e8SSarah Sharp * Make sure that the calculated SEL and PEL values for the link 34521ea7e0e8SSarah Sharp * state we're enabling aren't bigger than the max SEL/PEL 34531ea7e0e8SSarah Sharp * value that will fit in the SET SEL control transfer. 34541ea7e0e8SSarah Sharp * Otherwise the device would get an incorrect idea of the exit 34551ea7e0e8SSarah Sharp * latency for the link state, and could start a device-initiated 34561ea7e0e8SSarah Sharp * U1/U2 when the exit latencies are too high. 34571ea7e0e8SSarah Sharp */ 34581ea7e0e8SSarah Sharp if ((state == USB3_LPM_U1 && 34591ea7e0e8SSarah Sharp (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || 34601ea7e0e8SSarah Sharp u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || 34611ea7e0e8SSarah Sharp (state == USB3_LPM_U2 && 34621ea7e0e8SSarah Sharp (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || 34631ea7e0e8SSarah Sharp u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { 34641510a1a2SSarah Sharp dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", 34651ea7e0e8SSarah Sharp usb3_lpm_names[state], u1_sel, u1_pel); 34661ea7e0e8SSarah Sharp return -EINVAL; 34671ea7e0e8SSarah Sharp } 34681ea7e0e8SSarah Sharp 34691ea7e0e8SSarah Sharp /* 34701ea7e0e8SSarah Sharp * If we're enabling device-initiated LPM for one link state, 34711ea7e0e8SSarah Sharp * but the other link state has a too high SEL or PEL value, 34721ea7e0e8SSarah Sharp * just set those values to the max in the Set SEL request. 34731ea7e0e8SSarah Sharp */ 34741ea7e0e8SSarah Sharp if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) 34751ea7e0e8SSarah Sharp u1_sel = USB3_LPM_MAX_U1_SEL_PEL; 34761ea7e0e8SSarah Sharp 34771ea7e0e8SSarah Sharp if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) 34781ea7e0e8SSarah Sharp u1_pel = USB3_LPM_MAX_U1_SEL_PEL; 34791ea7e0e8SSarah Sharp 34801ea7e0e8SSarah Sharp if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) 34811ea7e0e8SSarah Sharp u2_sel = USB3_LPM_MAX_U2_SEL_PEL; 34821ea7e0e8SSarah Sharp 34831ea7e0e8SSarah Sharp if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) 34841ea7e0e8SSarah Sharp u2_pel = USB3_LPM_MAX_U2_SEL_PEL; 34851ea7e0e8SSarah Sharp 34861ea7e0e8SSarah Sharp /* 34871ea7e0e8SSarah Sharp * usb_enable_lpm() can be called as part of a failed device reset, 34881ea7e0e8SSarah Sharp * which may be initiated by an error path of a mass storage driver. 34891ea7e0e8SSarah Sharp * Therefore, use GFP_NOIO. 34901ea7e0e8SSarah Sharp */ 34911ea7e0e8SSarah Sharp sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); 34921ea7e0e8SSarah Sharp if (!sel_values) 34931ea7e0e8SSarah Sharp return -ENOMEM; 34941ea7e0e8SSarah Sharp 34951ea7e0e8SSarah Sharp sel_values->u1_sel = u1_sel; 34961ea7e0e8SSarah Sharp sel_values->u1_pel = u1_pel; 34971ea7e0e8SSarah Sharp sel_values->u2_sel = cpu_to_le16(u2_sel); 34981ea7e0e8SSarah Sharp sel_values->u2_pel = cpu_to_le16(u2_pel); 34991ea7e0e8SSarah Sharp 35001ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 35011ea7e0e8SSarah Sharp USB_REQ_SET_SEL, 35021ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 35031ea7e0e8SSarah Sharp 0, 0, 35041ea7e0e8SSarah Sharp sel_values, sizeof *(sel_values), 35051ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 35061ea7e0e8SSarah Sharp kfree(sel_values); 35071ea7e0e8SSarah Sharp return ret; 35081ea7e0e8SSarah Sharp } 35091ea7e0e8SSarah Sharp 35101ea7e0e8SSarah Sharp /* 35111ea7e0e8SSarah Sharp * Enable or disable device-initiated U1 or U2 transitions. 35121ea7e0e8SSarah Sharp */ 35131ea7e0e8SSarah Sharp static int usb_set_device_initiated_lpm(struct usb_device *udev, 35141ea7e0e8SSarah Sharp enum usb3_link_state state, bool enable) 35151ea7e0e8SSarah Sharp { 35161ea7e0e8SSarah Sharp int ret; 35171ea7e0e8SSarah Sharp int feature; 35181ea7e0e8SSarah Sharp 35191ea7e0e8SSarah Sharp switch (state) { 35201ea7e0e8SSarah Sharp case USB3_LPM_U1: 35211ea7e0e8SSarah Sharp feature = USB_DEVICE_U1_ENABLE; 35221ea7e0e8SSarah Sharp break; 35231ea7e0e8SSarah Sharp case USB3_LPM_U2: 35241ea7e0e8SSarah Sharp feature = USB_DEVICE_U2_ENABLE; 35251ea7e0e8SSarah Sharp break; 35261ea7e0e8SSarah Sharp default: 35271ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", 35281ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable"); 35291ea7e0e8SSarah Sharp return -EINVAL; 35301ea7e0e8SSarah Sharp } 35311ea7e0e8SSarah Sharp 35321ea7e0e8SSarah Sharp if (udev->state != USB_STATE_CONFIGURED) { 35331ea7e0e8SSarah Sharp dev_dbg(&udev->dev, "%s: Can't %s %s state " 35341ea7e0e8SSarah Sharp "for unconfigured device.\n", 35351ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable", 35361ea7e0e8SSarah Sharp usb3_lpm_names[state]); 35371ea7e0e8SSarah Sharp return 0; 35381ea7e0e8SSarah Sharp } 35391ea7e0e8SSarah Sharp 35401ea7e0e8SSarah Sharp if (enable) { 35411ea7e0e8SSarah Sharp /* 35421ea7e0e8SSarah Sharp * Now send the control transfer to enable device-initiated LPM 35431ea7e0e8SSarah Sharp * for either U1 or U2. 35441ea7e0e8SSarah Sharp */ 35451ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 35461ea7e0e8SSarah Sharp USB_REQ_SET_FEATURE, 35471ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 35481ea7e0e8SSarah Sharp feature, 35491ea7e0e8SSarah Sharp 0, NULL, 0, 35501ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 35511ea7e0e8SSarah Sharp } else { 35521ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 35531ea7e0e8SSarah Sharp USB_REQ_CLEAR_FEATURE, 35541ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 35551ea7e0e8SSarah Sharp feature, 35561ea7e0e8SSarah Sharp 0, NULL, 0, 35571ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 35581ea7e0e8SSarah Sharp } 35591ea7e0e8SSarah Sharp if (ret < 0) { 35601ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", 35611ea7e0e8SSarah Sharp enable ? "Enable" : "Disable", 35621ea7e0e8SSarah Sharp usb3_lpm_names[state]); 35631ea7e0e8SSarah Sharp return -EBUSY; 35641ea7e0e8SSarah Sharp } 35651ea7e0e8SSarah Sharp return 0; 35661ea7e0e8SSarah Sharp } 35671ea7e0e8SSarah Sharp 35681ea7e0e8SSarah Sharp static int usb_set_lpm_timeout(struct usb_device *udev, 35691ea7e0e8SSarah Sharp enum usb3_link_state state, int timeout) 35701ea7e0e8SSarah Sharp { 35711ea7e0e8SSarah Sharp int ret; 35721ea7e0e8SSarah Sharp int feature; 35731ea7e0e8SSarah Sharp 35741ea7e0e8SSarah Sharp switch (state) { 35751ea7e0e8SSarah Sharp case USB3_LPM_U1: 35761ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U1_TIMEOUT; 35771ea7e0e8SSarah Sharp break; 35781ea7e0e8SSarah Sharp case USB3_LPM_U2: 35791ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U2_TIMEOUT; 35801ea7e0e8SSarah Sharp break; 35811ea7e0e8SSarah Sharp default: 35821ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", 35831ea7e0e8SSarah Sharp __func__); 35841ea7e0e8SSarah Sharp return -EINVAL; 35851ea7e0e8SSarah Sharp } 35861ea7e0e8SSarah Sharp 35871ea7e0e8SSarah Sharp if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && 35881ea7e0e8SSarah Sharp timeout != USB3_LPM_DEVICE_INITIATED) { 35891ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " 35901ea7e0e8SSarah Sharp "which is a reserved value.\n", 35911ea7e0e8SSarah Sharp usb3_lpm_names[state], timeout); 35921ea7e0e8SSarah Sharp return -EINVAL; 35931ea7e0e8SSarah Sharp } 35941ea7e0e8SSarah Sharp 35951ea7e0e8SSarah Sharp ret = set_port_feature(udev->parent, 35961ea7e0e8SSarah Sharp USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, 35971ea7e0e8SSarah Sharp feature); 35981ea7e0e8SSarah Sharp if (ret < 0) { 35991ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," 36001ea7e0e8SSarah Sharp "error code %i\n", usb3_lpm_names[state], 36011ea7e0e8SSarah Sharp timeout, ret); 36021ea7e0e8SSarah Sharp return -EBUSY; 36031ea7e0e8SSarah Sharp } 36041ea7e0e8SSarah Sharp if (state == USB3_LPM_U1) 36051ea7e0e8SSarah Sharp udev->u1_params.timeout = timeout; 36061ea7e0e8SSarah Sharp else 36071ea7e0e8SSarah Sharp udev->u2_params.timeout = timeout; 36081ea7e0e8SSarah Sharp return 0; 36091ea7e0e8SSarah Sharp } 36101ea7e0e8SSarah Sharp 36111ea7e0e8SSarah Sharp /* 36121ea7e0e8SSarah Sharp * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated 36131ea7e0e8SSarah Sharp * U1/U2 entry. 36141ea7e0e8SSarah Sharp * 36151ea7e0e8SSarah Sharp * We will attempt to enable U1 or U2, but there are no guarantees that the 36161ea7e0e8SSarah Sharp * control transfers to set the hub timeout or enable device-initiated U1/U2 36171ea7e0e8SSarah Sharp * will be successful. 36181ea7e0e8SSarah Sharp * 36191ea7e0e8SSarah Sharp * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI 36201ea7e0e8SSarah Sharp * driver know about it. If that call fails, it should be harmless, and just 36211ea7e0e8SSarah Sharp * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. 36221ea7e0e8SSarah Sharp */ 36231ea7e0e8SSarah Sharp static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 36241ea7e0e8SSarah Sharp enum usb3_link_state state) 36251ea7e0e8SSarah Sharp { 362665a95b75SSarah Sharp int timeout, ret; 3627ae8963adSSarah Sharp __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; 3628ae8963adSSarah Sharp __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; 3629ae8963adSSarah Sharp 3630ae8963adSSarah Sharp /* If the device says it doesn't have *any* exit latency to come out of 3631ae8963adSSarah Sharp * U1 or U2, it's probably lying. Assume it doesn't implement that link 3632ae8963adSSarah Sharp * state. 3633ae8963adSSarah Sharp */ 3634ae8963adSSarah Sharp if ((state == USB3_LPM_U1 && u1_mel == 0) || 3635ae8963adSSarah Sharp (state == USB3_LPM_U2 && u2_mel == 0)) 3636ae8963adSSarah Sharp return; 36371ea7e0e8SSarah Sharp 363865a95b75SSarah Sharp /* 363965a95b75SSarah Sharp * First, let the device know about the exit latencies 364065a95b75SSarah Sharp * associated with the link state we're about to enable. 364165a95b75SSarah Sharp */ 364265a95b75SSarah Sharp ret = usb_req_set_sel(udev, state); 364365a95b75SSarah Sharp if (ret < 0) { 364465a95b75SSarah Sharp dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", 364565a95b75SSarah Sharp usb3_lpm_names[state]); 364665a95b75SSarah Sharp return; 364765a95b75SSarah Sharp } 364865a95b75SSarah Sharp 36491ea7e0e8SSarah Sharp /* We allow the host controller to set the U1/U2 timeout internally 36501ea7e0e8SSarah Sharp * first, so that it can change its schedule to account for the 36511ea7e0e8SSarah Sharp * additional latency to send data to a device in a lower power 36521ea7e0e8SSarah Sharp * link state. 36531ea7e0e8SSarah Sharp */ 36541ea7e0e8SSarah Sharp timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); 36551ea7e0e8SSarah Sharp 36561ea7e0e8SSarah Sharp /* xHCI host controller doesn't want to enable this LPM state. */ 36571ea7e0e8SSarah Sharp if (timeout == 0) 36581ea7e0e8SSarah Sharp return; 36591ea7e0e8SSarah Sharp 36601ea7e0e8SSarah Sharp if (timeout < 0) { 36611ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not enable %s link state, " 36621ea7e0e8SSarah Sharp "xHCI error %i.\n", usb3_lpm_names[state], 36631ea7e0e8SSarah Sharp timeout); 36641ea7e0e8SSarah Sharp return; 36651ea7e0e8SSarah Sharp } 36661ea7e0e8SSarah Sharp 36671ea7e0e8SSarah Sharp if (usb_set_lpm_timeout(udev, state, timeout)) 36681ea7e0e8SSarah Sharp /* If we can't set the parent hub U1/U2 timeout, 36691ea7e0e8SSarah Sharp * device-initiated LPM won't be allowed either, so let the xHCI 36701ea7e0e8SSarah Sharp * host know that this link state won't be enabled. 36711ea7e0e8SSarah Sharp */ 36721ea7e0e8SSarah Sharp hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); 36731ea7e0e8SSarah Sharp 36741ea7e0e8SSarah Sharp /* Only a configured device will accept the Set Feature U1/U2_ENABLE */ 36751ea7e0e8SSarah Sharp else if (udev->actconfig) 36761ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, true); 36771ea7e0e8SSarah Sharp 36781ea7e0e8SSarah Sharp } 36791ea7e0e8SSarah Sharp 36801ea7e0e8SSarah Sharp /* 36811ea7e0e8SSarah Sharp * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated 36821ea7e0e8SSarah Sharp * U1/U2 entry. 36831ea7e0e8SSarah Sharp * 36841ea7e0e8SSarah Sharp * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. 36851ea7e0e8SSarah Sharp * If zero is returned, the parent will not allow the link to go into U1/U2. 36861ea7e0e8SSarah Sharp * 36871ea7e0e8SSarah Sharp * If zero is returned, device-initiated U1/U2 entry may still be enabled, but 36881ea7e0e8SSarah Sharp * it won't have an effect on the bus link state because the parent hub will 36891ea7e0e8SSarah Sharp * still disallow device-initiated U1/U2 entry. 36901ea7e0e8SSarah Sharp * 36911ea7e0e8SSarah Sharp * If zero is returned, the xHCI host controller may still think U1/U2 entry is 36921ea7e0e8SSarah Sharp * possible. The result will be slightly more bus bandwidth will be taken up 36931ea7e0e8SSarah Sharp * (to account for U1/U2 exit latency), but it should be harmless. 36941ea7e0e8SSarah Sharp */ 36951ea7e0e8SSarah Sharp static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 36961ea7e0e8SSarah Sharp enum usb3_link_state state) 36971ea7e0e8SSarah Sharp { 36981ea7e0e8SSarah Sharp int feature; 36991ea7e0e8SSarah Sharp 37001ea7e0e8SSarah Sharp switch (state) { 37011ea7e0e8SSarah Sharp case USB3_LPM_U1: 37021ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U1_TIMEOUT; 37031ea7e0e8SSarah Sharp break; 37041ea7e0e8SSarah Sharp case USB3_LPM_U2: 37051ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U2_TIMEOUT; 37061ea7e0e8SSarah Sharp break; 37071ea7e0e8SSarah Sharp default: 37081ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", 37091ea7e0e8SSarah Sharp __func__); 37101ea7e0e8SSarah Sharp return -EINVAL; 37111ea7e0e8SSarah Sharp } 37121ea7e0e8SSarah Sharp 37131ea7e0e8SSarah Sharp if (usb_set_lpm_timeout(udev, state, 0)) 37141ea7e0e8SSarah Sharp return -EBUSY; 37151ea7e0e8SSarah Sharp 37161ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, false); 37171ea7e0e8SSarah Sharp 37181ea7e0e8SSarah Sharp if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) 37191ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " 37201ea7e0e8SSarah Sharp "bus schedule bandwidth may be impacted.\n", 37211ea7e0e8SSarah Sharp usb3_lpm_names[state]); 37221ea7e0e8SSarah Sharp return 0; 37231ea7e0e8SSarah Sharp } 37241ea7e0e8SSarah Sharp 37251ea7e0e8SSarah Sharp /* 37261ea7e0e8SSarah Sharp * Disable hub-initiated and device-initiated U1 and U2 entry. 37271ea7e0e8SSarah Sharp * Caller must own the bandwidth_mutex. 37281ea7e0e8SSarah Sharp * 37291ea7e0e8SSarah Sharp * This will call usb_enable_lpm() on failure, which will decrement 37301ea7e0e8SSarah Sharp * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. 37311ea7e0e8SSarah Sharp */ 37321ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 37331ea7e0e8SSarah Sharp { 37341ea7e0e8SSarah Sharp struct usb_hcd *hcd; 37351ea7e0e8SSarah Sharp 37361ea7e0e8SSarah Sharp if (!udev || !udev->parent || 37371ea7e0e8SSarah Sharp udev->speed != USB_SPEED_SUPER || 37381ea7e0e8SSarah Sharp !udev->lpm_capable) 37391ea7e0e8SSarah Sharp return 0; 37401ea7e0e8SSarah Sharp 37411ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 37421ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) 37431ea7e0e8SSarah Sharp return 0; 37441ea7e0e8SSarah Sharp 37451ea7e0e8SSarah Sharp udev->lpm_disable_count++; 374655558c33SDan Carpenter if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) 37471ea7e0e8SSarah Sharp return 0; 37481ea7e0e8SSarah Sharp 37491ea7e0e8SSarah Sharp /* If LPM is enabled, attempt to disable it. */ 37501ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) 37511ea7e0e8SSarah Sharp goto enable_lpm; 37521ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) 37531ea7e0e8SSarah Sharp goto enable_lpm; 37541ea7e0e8SSarah Sharp 37551ea7e0e8SSarah Sharp return 0; 37561ea7e0e8SSarah Sharp 37571ea7e0e8SSarah Sharp enable_lpm: 37581ea7e0e8SSarah Sharp usb_enable_lpm(udev); 37591ea7e0e8SSarah Sharp return -EBUSY; 37601ea7e0e8SSarah Sharp } 37611ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 37621ea7e0e8SSarah Sharp 37631ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ 37641ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 37651ea7e0e8SSarah Sharp { 37661ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 37671ea7e0e8SSarah Sharp int ret; 37681ea7e0e8SSarah Sharp 37691ea7e0e8SSarah Sharp if (!hcd) 37701ea7e0e8SSarah Sharp return -EINVAL; 37711ea7e0e8SSarah Sharp 37721ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 37731ea7e0e8SSarah Sharp ret = usb_disable_lpm(udev); 37741ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 37751ea7e0e8SSarah Sharp 37761ea7e0e8SSarah Sharp return ret; 37771ea7e0e8SSarah Sharp } 37781ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 37791ea7e0e8SSarah Sharp 37801ea7e0e8SSarah Sharp /* 37811ea7e0e8SSarah Sharp * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The 37821ea7e0e8SSarah Sharp * xHCI host policy may prevent U1 or U2 from being enabled. 37831ea7e0e8SSarah Sharp * 37841ea7e0e8SSarah Sharp * Other callers may have disabled link PM, so U1 and U2 entry will be disabled 37851ea7e0e8SSarah Sharp * until the lpm_disable_count drops to zero. Caller must own the 37861ea7e0e8SSarah Sharp * bandwidth_mutex. 37871ea7e0e8SSarah Sharp */ 37881ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) 37891ea7e0e8SSarah Sharp { 37901ea7e0e8SSarah Sharp struct usb_hcd *hcd; 37911ea7e0e8SSarah Sharp 37921ea7e0e8SSarah Sharp if (!udev || !udev->parent || 37931ea7e0e8SSarah Sharp udev->speed != USB_SPEED_SUPER || 37941ea7e0e8SSarah Sharp !udev->lpm_capable) 37951ea7e0e8SSarah Sharp return; 37961ea7e0e8SSarah Sharp 37971ea7e0e8SSarah Sharp udev->lpm_disable_count--; 37981ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 37991ea7e0e8SSarah Sharp /* Double check that we can both enable and disable LPM. 38001ea7e0e8SSarah Sharp * Device must be configured to accept set feature U1/U2 timeout. 38011ea7e0e8SSarah Sharp */ 38021ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || 38031ea7e0e8SSarah Sharp !hcd->driver->disable_usb3_lpm_timeout) 38041ea7e0e8SSarah Sharp return; 38051ea7e0e8SSarah Sharp 38061ea7e0e8SSarah Sharp if (udev->lpm_disable_count > 0) 38071ea7e0e8SSarah Sharp return; 38081ea7e0e8SSarah Sharp 38091ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U1); 38101ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U2); 38111ea7e0e8SSarah Sharp } 38121ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 38131ea7e0e8SSarah Sharp 38141ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ 38151ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) 38161ea7e0e8SSarah Sharp { 38171ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 38181ea7e0e8SSarah Sharp 38191ea7e0e8SSarah Sharp if (!hcd) 38201ea7e0e8SSarah Sharp return; 38211ea7e0e8SSarah Sharp 38221ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 38231ea7e0e8SSarah Sharp usb_enable_lpm(udev); 38241ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 38251ea7e0e8SSarah Sharp } 38261ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 38271ea7e0e8SSarah Sharp 38281ea7e0e8SSarah Sharp 3829d388dab7SAlan Stern #else /* CONFIG_PM */ 3830d388dab7SAlan Stern 3831511366daSAndrew Morton #define hub_suspend NULL 3832511366daSAndrew Morton #define hub_resume NULL 3833f07600cfSAlan Stern #define hub_reset_resume NULL 38341ea7e0e8SSarah Sharp 38351ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 38361ea7e0e8SSarah Sharp { 38371ea7e0e8SSarah Sharp return 0; 38381ea7e0e8SSarah Sharp } 3839e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 38401ea7e0e8SSarah Sharp 38411ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) { } 3842e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 38431ea7e0e8SSarah Sharp 38441ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 38451ea7e0e8SSarah Sharp { 38461ea7e0e8SSarah Sharp return 0; 38471ea7e0e8SSarah Sharp } 3848e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 38491ea7e0e8SSarah Sharp 38501ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) { } 3851e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 3852f74631e3SSarah Sharp 3853f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 3854f74631e3SSarah Sharp { 3855f74631e3SSarah Sharp return 0; 3856f74631e3SSarah Sharp } 3857f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 3858f74631e3SSarah Sharp 3859f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) { } 3860f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 3861c4b51a43SAlan Stern 3862c4b51a43SAlan Stern #endif /* CONFIG_PM */ 3863d388dab7SAlan Stern 38641da177e4SLinus Torvalds 38651da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 38661da177e4SLinus Torvalds * 38671da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 38681da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 38691da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 38701da177e4SLinus Torvalds * 38711da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 38721da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 38731da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 38741da177e4SLinus Torvalds * 38751da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 38761da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 38771da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 38781da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 38791da177e4SLinus Torvalds */ 3880ad493e5eSLan Tianyu int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) 38811da177e4SLinus Torvalds { 38821da177e4SLinus Torvalds int ret; 38831da177e4SLinus Torvalds int total_time, stable_time = 0; 38841da177e4SLinus Torvalds u16 portchange, portstatus; 38851da177e4SLinus Torvalds unsigned connection = 0xffff; 38861da177e4SLinus Torvalds 38871da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 38881da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 38891da177e4SLinus Torvalds if (ret < 0) 38901da177e4SLinus Torvalds return ret; 38911da177e4SLinus Torvalds 38921da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 38931da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 3894ad493e5eSLan Tianyu if (!must_be_connected || 3895ad493e5eSLan Tianyu (connection == USB_PORT_STAT_CONNECTION)) 38961da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 38971da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 38981da177e4SLinus Torvalds break; 38991da177e4SLinus Torvalds } else { 39001da177e4SLinus Torvalds stable_time = 0; 39011da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 39021da177e4SLinus Torvalds } 39031da177e4SLinus Torvalds 39041da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 3905ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 39061da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 39071da177e4SLinus Torvalds } 39081da177e4SLinus Torvalds 39091da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 39101da177e4SLinus Torvalds break; 39111da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 39121da177e4SLinus Torvalds } 39131da177e4SLinus Torvalds 39141da177e4SLinus Torvalds dev_dbg (hub->intfdev, 39151da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 39161da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 39171da177e4SLinus Torvalds 39181da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 39191da177e4SLinus Torvalds return -ETIMEDOUT; 39201da177e4SLinus Torvalds return portstatus; 39211da177e4SLinus Torvalds } 39221da177e4SLinus Torvalds 3923fc721f51SInaky Perez-Gonzalez void usb_ep0_reinit(struct usb_device *udev) 39241da177e4SLinus Torvalds { 3925ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); 3926ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); 39272caf7fcdSAlan Stern usb_enable_endpoint(udev, &udev->ep0, true); 39281da177e4SLinus Torvalds } 3929fc721f51SInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_ep0_reinit); 39301da177e4SLinus Torvalds 39311da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 39321da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 39331da177e4SLinus Torvalds 39344326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 39351da177e4SLinus Torvalds { 39361da177e4SLinus Torvalds int retval; 3937c6515272SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 39381da177e4SLinus Torvalds 3939c6515272SSarah Sharp /* 3940c6515272SSarah Sharp * The host controller will choose the device address, 3941c6515272SSarah Sharp * instead of the core having chosen it earlier 3942c6515272SSarah Sharp */ 3943c6515272SSarah Sharp if (!hcd->driver->address_device && devnum <= 1) 39441da177e4SLinus Torvalds return -EINVAL; 39451da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 39461da177e4SLinus Torvalds return 0; 39471da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 39481da177e4SLinus Torvalds return -EINVAL; 3949c8d4af8eSAndiry Xu if (hcd->driver->address_device) 3950c6515272SSarah Sharp retval = hcd->driver->address_device(hcd, udev); 3951c8d4af8eSAndiry Xu else 39521da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 39534326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 39541da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 39551da177e4SLinus Torvalds if (retval == 0) { 39563b29b68bSAlan Stern update_devnum(udev, devnum); 39574953d141SDavid Vrabel /* Device now using proper address. */ 39581da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 3959fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 39601da177e4SLinus Torvalds } 39611da177e4SLinus Torvalds return retval; 39621da177e4SLinus Torvalds } 39631da177e4SLinus Torvalds 3964890dae88SMathias Nyman /* 3965890dae88SMathias Nyman * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM 3966890dae88SMathias Nyman * when they're plugged into a USB 2.0 port, but they don't work when LPM is 3967890dae88SMathias Nyman * enabled. 3968890dae88SMathias Nyman * 3969890dae88SMathias Nyman * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the 3970890dae88SMathias Nyman * device says it supports the new USB 2.0 Link PM errata by setting the BESL 3971890dae88SMathias Nyman * support bit in the BOS descriptor. 3972890dae88SMathias Nyman */ 3973890dae88SMathias Nyman static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev) 3974890dae88SMathias Nyman { 3975890dae88SMathias Nyman int connect_type; 3976890dae88SMathias Nyman 3977890dae88SMathias Nyman if (!udev->usb2_hw_lpm_capable) 3978890dae88SMathias Nyman return; 3979890dae88SMathias Nyman 3980890dae88SMathias Nyman connect_type = usb_get_hub_port_connect_type(udev->parent, 3981890dae88SMathias Nyman udev->portnum); 3982890dae88SMathias Nyman 398323c05820SBjørn Mork if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) || 3984890dae88SMathias Nyman connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 3985890dae88SMathias Nyman udev->usb2_hw_lpm_allowed = 1; 3986890dae88SMathias Nyman usb_set_usb2_hardware_lpm(udev, 1); 3987890dae88SMathias Nyman } 3988890dae88SMathias Nyman } 3989890dae88SMathias Nyman 399048fc7dbdSDan Williams static int hub_enable_device(struct usb_device *udev) 399148fc7dbdSDan Williams { 399248fc7dbdSDan Williams struct usb_hcd *hcd = bus_to_hcd(udev->bus); 399348fc7dbdSDan Williams 399448fc7dbdSDan Williams if (!hcd->driver->enable_device) 399548fc7dbdSDan Williams return 0; 399648fc7dbdSDan Williams if (udev->state == USB_STATE_ADDRESS) 399748fc7dbdSDan Williams return 0; 399848fc7dbdSDan Williams if (udev->state != USB_STATE_DEFAULT) 399948fc7dbdSDan Williams return -EINVAL; 400048fc7dbdSDan Williams 400148fc7dbdSDan Williams return hcd->driver->enable_device(hcd, udev); 400248fc7dbdSDan Williams } 400348fc7dbdSDan Williams 40041da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 40051da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 40061da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 40071da177e4SLinus Torvalds * 40081da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 4009742120c6SMing Lei * usb_reset_and_verify_device), the caller must own the device lock. For a 40101da177e4SLinus Torvalds * newly detected device that is not accessible through any global 40111da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 40121da177e4SLinus Torvalds */ 40131da177e4SLinus Torvalds static int 40141da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 40151da177e4SLinus Torvalds int retry_counter) 40161da177e4SLinus Torvalds { 40174186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 40181da177e4SLinus Torvalds 40191da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4020e7b77172SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 40211da177e4SLinus Torvalds int i, j, retval; 40221da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 40231da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 4024e538dfdaSMichal Nazarewicz const char *speed; 40254326ed0bSAlan Stern int devnum = udev->devnum; 40261da177e4SLinus Torvalds 40271da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 40281da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 40291da177e4SLinus Torvalds */ 40301da177e4SLinus Torvalds if (!hdev->parent) { 40311da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 40321da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 40331da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 40341da177e4SLinus Torvalds } 40351da177e4SLinus Torvalds 40361da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 40371da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 40381da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 40391da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 40401da177e4SLinus Torvalds 40414186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 40421da177e4SLinus Torvalds 40431da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 4044e7b77172SSarah Sharp /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ 404575d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 40461da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 40471da177e4SLinus Torvalds goto fail; 40481da177e4SLinus Torvalds /* success, speed is known */ 404907194ab7SLuben Tuikov 40501da177e4SLinus Torvalds retval = -ENODEV; 40511da177e4SLinus Torvalds 40521da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 40531da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 40541da177e4SLinus Torvalds goto fail; 40551da177e4SLinus Torvalds } 40561da177e4SLinus Torvalds oldspeed = udev->speed; 40571da177e4SLinus Torvalds 40581da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 40591da177e4SLinus Torvalds * it's fixed size except for full speed devices. 40605bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 40615bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 40621da177e4SLinus Torvalds */ 40631da177e4SLinus Torvalds switch (udev->speed) { 40646b403b02SSarah Sharp case USB_SPEED_SUPER: 4065551cdbbeSGreg Kroah-Hartman case USB_SPEED_WIRELESS: /* fixed at 512 */ 4066551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); 40675bb6e0aeSInaky Perez-Gonzalez break; 40681da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 4069551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 40701da177e4SLinus Torvalds break; 40711da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 40721da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 40731da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 40741da177e4SLinus Torvalds * then correct our initial guess. 40751da177e4SLinus Torvalds */ 4076551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 40771da177e4SLinus Torvalds break; 40781da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 4079551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); 40801da177e4SLinus Torvalds break; 40811da177e4SLinus Torvalds default: 40821da177e4SLinus Torvalds goto fail; 40831da177e4SLinus Torvalds } 40841da177e4SLinus Torvalds 4085e538dfdaSMichal Nazarewicz if (udev->speed == USB_SPEED_WIRELESS) 4086e538dfdaSMichal Nazarewicz speed = "variable speed Wireless"; 4087e538dfdaSMichal Nazarewicz else 4088e538dfdaSMichal Nazarewicz speed = usb_speed_string(udev->speed); 4089e538dfdaSMichal Nazarewicz 4090c6515272SSarah Sharp if (udev->speed != USB_SPEED_SUPER) 409183a07196SInaky Perez-Gonzalez dev_info(&udev->dev, 4092e538dfdaSMichal Nazarewicz "%s %s USB device number %d using %s\n", 4093e538dfdaSMichal Nazarewicz (udev->config) ? "reset" : "new", speed, 40943b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 40951da177e4SLinus Torvalds 40961da177e4SLinus Torvalds /* Set up TT records, if needed */ 40971da177e4SLinus Torvalds if (hdev->tt) { 40981da177e4SLinus Torvalds udev->tt = hdev->tt; 40991da177e4SLinus Torvalds udev->ttport = hdev->ttport; 41001da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 41011da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 4102d199c96dSAlan Stern if (!hub->tt.hub) { 4103d199c96dSAlan Stern dev_err(&udev->dev, "parent hub has no TT\n"); 4104d199c96dSAlan Stern retval = -EINVAL; 4105d199c96dSAlan Stern goto fail; 4106d199c96dSAlan Stern } 41071da177e4SLinus Torvalds udev->tt = &hub->tt; 41081da177e4SLinus Torvalds udev->ttport = port1; 41091da177e4SLinus Torvalds } 41101da177e4SLinus Torvalds 41111da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 41121da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 41131da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 41141da177e4SLinus Torvalds * Change it cautiously. 41151da177e4SLinus Torvalds * 411648fc7dbdSDan Williams * NOTE: If use_new_scheme() is true we will start by issuing 41171da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 41181da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 41191da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 41201da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 41211da177e4SLinus Torvalds * value. 41221da177e4SLinus Torvalds */ 41231da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 412448fc7dbdSDan Williams bool did_new_scheme = false; 412548fc7dbdSDan Williams 412648fc7dbdSDan Williams if (use_new_scheme(udev, retry_counter)) { 41271da177e4SLinus Torvalds struct usb_device_descriptor *buf; 41281da177e4SLinus Torvalds int r = 0; 41291da177e4SLinus Torvalds 413048fc7dbdSDan Williams did_new_scheme = true; 413148fc7dbdSDan Williams retval = hub_enable_device(udev); 4132938569ebSOliver Neukum if (retval < 0) { 4133938569ebSOliver Neukum dev_err(&udev->dev, 4134938569ebSOliver Neukum "hub failed to enable device, error %d\n", 4135938569ebSOliver Neukum retval); 413648fc7dbdSDan Williams goto fail; 4137938569ebSOliver Neukum } 413848fc7dbdSDan Williams 41391da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 41401da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 41411da177e4SLinus Torvalds if (!buf) { 41421da177e4SLinus Torvalds retval = -ENOMEM; 41431da177e4SLinus Torvalds continue; 41441da177e4SLinus Torvalds } 41451da177e4SLinus Torvalds 4146b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 4147b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 4148b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 41491da177e4SLinus Torvalds */ 41501da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 41511da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 41521da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 41531da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 41541da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 41551da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 4156fd7c519dSJaroslav Kysela initial_descriptor_timeout); 41571da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 41585bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 41591da177e4SLinus Torvalds if (buf->bDescriptorType == 41601da177e4SLinus Torvalds USB_DT_DEVICE) { 41611da177e4SLinus Torvalds r = 0; 41621da177e4SLinus Torvalds break; 41631da177e4SLinus Torvalds } 41641da177e4SLinus Torvalds /* FALL THROUGH */ 41651da177e4SLinus Torvalds default: 41661da177e4SLinus Torvalds if (r == 0) 41671da177e4SLinus Torvalds r = -EPROTO; 41681da177e4SLinus Torvalds break; 41691da177e4SLinus Torvalds } 41701da177e4SLinus Torvalds if (r == 0) 41711da177e4SLinus Torvalds break; 41721da177e4SLinus Torvalds } 41731da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 41741da177e4SLinus Torvalds buf->bMaxPacketSize0; 41751da177e4SLinus Torvalds kfree(buf); 41761da177e4SLinus Torvalds 417775d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 41781da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 41791da177e4SLinus Torvalds goto fail; 41801da177e4SLinus Torvalds if (oldspeed != udev->speed) { 41811da177e4SLinus Torvalds dev_dbg(&udev->dev, 41821da177e4SLinus Torvalds "device reset changed speed!\n"); 41831da177e4SLinus Torvalds retval = -ENODEV; 41841da177e4SLinus Torvalds goto fail; 41851da177e4SLinus Torvalds } 41861da177e4SLinus Torvalds if (r) { 4187e9e88fb7SAlan Stern if (r != -ENODEV) 4188e9e88fb7SAlan Stern dev_err(&udev->dev, "device descriptor read/64, error %d\n", 4189b9cef6c3SWu Fengguang r); 41901da177e4SLinus Torvalds retval = -EMSGSIZE; 41911da177e4SLinus Torvalds continue; 41921da177e4SLinus Torvalds } 41931da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 41941da177e4SLinus Torvalds } 41951da177e4SLinus Torvalds 41966c529cdcSInaky Perez-Gonzalez /* 41976c529cdcSInaky Perez-Gonzalez * If device is WUSB, we already assigned an 41986c529cdcSInaky Perez-Gonzalez * unauthorized address in the Connect Ack sequence; 41996c529cdcSInaky Perez-Gonzalez * authorization will assign the final address. 42006c529cdcSInaky Perez-Gonzalez */ 42016c529cdcSInaky Perez-Gonzalez if (udev->wusb == 0) { 42021da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 42034326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 42041da177e4SLinus Torvalds if (retval >= 0) 42051da177e4SLinus Torvalds break; 42061da177e4SLinus Torvalds msleep(200); 42071da177e4SLinus Torvalds } 42081da177e4SLinus Torvalds if (retval < 0) { 4209e9e88fb7SAlan Stern if (retval != -ENODEV) 4210e9e88fb7SAlan Stern dev_err(&udev->dev, "device not accepting address %d, error %d\n", 42114326ed0bSAlan Stern devnum, retval); 42121da177e4SLinus Torvalds goto fail; 42131da177e4SLinus Torvalds } 4214c6515272SSarah Sharp if (udev->speed == USB_SPEED_SUPER) { 4215c6515272SSarah Sharp devnum = udev->devnum; 4216c6515272SSarah Sharp dev_info(&udev->dev, 42173b29b68bSAlan Stern "%s SuperSpeed USB device number %d using %s\n", 4218c6515272SSarah Sharp (udev->config) ? "reset" : "new", 42193b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 4220c6515272SSarah Sharp } 42211da177e4SLinus Torvalds 42221da177e4SLinus Torvalds /* cope with hardware quirkiness: 42231da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 42241da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 42251da177e4SLinus Torvalds */ 42261da177e4SLinus Torvalds msleep(10); 422748fc7dbdSDan Williams /* use_new_scheme() checks the speed which may have 422848fc7dbdSDan Williams * changed since the initial look so we cache the result 422948fc7dbdSDan Williams * in did_new_scheme 423048fc7dbdSDan Williams */ 423148fc7dbdSDan Williams if (did_new_scheme) 42321da177e4SLinus Torvalds break; 42336c529cdcSInaky Perez-Gonzalez } 42341da177e4SLinus Torvalds 42351da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 42361da177e4SLinus Torvalds if (retval < 8) { 4237e9e88fb7SAlan Stern if (retval != -ENODEV) 4238b9cef6c3SWu Fengguang dev_err(&udev->dev, 4239b9cef6c3SWu Fengguang "device descriptor read/8, error %d\n", 4240b9cef6c3SWu Fengguang retval); 42411da177e4SLinus Torvalds if (retval >= 0) 42421da177e4SLinus Torvalds retval = -EMSGSIZE; 42431da177e4SLinus Torvalds } else { 42441da177e4SLinus Torvalds retval = 0; 42451da177e4SLinus Torvalds break; 42461da177e4SLinus Torvalds } 42471da177e4SLinus Torvalds } 42481da177e4SLinus Torvalds if (retval) 42491da177e4SLinus Torvalds goto fail; 42501da177e4SLinus Torvalds 4251b76baa81SPeter Chen if (hcd->phy && !hdev->parent) 4252ac96511bSPeter Chen usb_phy_notify_connect(hcd->phy, udev->speed); 4253b76baa81SPeter Chen 4254d8aec3dbSElric Fu /* 4255d8aec3dbSElric Fu * Some superspeed devices have finished the link training process 4256d8aec3dbSElric Fu * and attached to a superspeed hub port, but the device descriptor 4257d8aec3dbSElric Fu * got from those devices show they aren't superspeed devices. Warm 4258d8aec3dbSElric Fu * reset the port attached by the devices can fix them. 4259d8aec3dbSElric Fu */ 4260d8aec3dbSElric Fu if ((udev->speed == USB_SPEED_SUPER) && 4261d8aec3dbSElric Fu (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { 4262d8aec3dbSElric Fu dev_err(&udev->dev, "got a wrong device descriptor, " 4263d8aec3dbSElric Fu "warm reset device\n"); 4264d8aec3dbSElric Fu hub_port_reset(hub, port1, udev, 4265d8aec3dbSElric Fu HUB_BH_RESET_TIME, true); 4266d8aec3dbSElric Fu retval = -EINVAL; 4267d8aec3dbSElric Fu goto fail; 4268d8aec3dbSElric Fu } 4269d8aec3dbSElric Fu 42706b403b02SSarah Sharp if (udev->descriptor.bMaxPacketSize0 == 0xff || 42716b403b02SSarah Sharp udev->speed == USB_SPEED_SUPER) 42726b403b02SSarah Sharp i = 512; 42736b403b02SSarah Sharp else 42746b403b02SSarah Sharp i = udev->descriptor.bMaxPacketSize0; 427529cc8897SKuninori Morimoto if (usb_endpoint_maxp(&udev->ep0.desc) != i) { 427656626a72SAlan Stern if (udev->speed == USB_SPEED_LOW || 42771da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 427856626a72SAlan Stern dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); 42791da177e4SLinus Torvalds retval = -EMSGSIZE; 42801da177e4SLinus Torvalds goto fail; 42811da177e4SLinus Torvalds } 428256626a72SAlan Stern if (udev->speed == USB_SPEED_FULL) 42831da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 428456626a72SAlan Stern else 428556626a72SAlan Stern dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); 42861da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 4287fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 42881da177e4SLinus Torvalds } 42891da177e4SLinus Torvalds 42901da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 42911da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 4292e9e88fb7SAlan Stern if (retval != -ENODEV) 4293b9cef6c3SWu Fengguang dev_err(&udev->dev, "device descriptor read/all, error %d\n", 4294b9cef6c3SWu Fengguang retval); 42951da177e4SLinus Torvalds if (retval >= 0) 42961da177e4SLinus Torvalds retval = -ENOMSG; 42971da177e4SLinus Torvalds goto fail; 42981da177e4SLinus Torvalds } 42991da177e4SLinus Torvalds 43001ff4df56SAndiry Xu if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { 43011ff4df56SAndiry Xu retval = usb_get_bos_descriptor(udev); 430251e0a012SSarah Sharp if (!retval) { 4303d9b2099cSSarah Sharp udev->lpm_capable = usb_device_supports_lpm(udev); 430451e0a012SSarah Sharp usb_set_lpm_parameters(udev); 430551e0a012SSarah Sharp } 43061ff4df56SAndiry Xu } 43073148bf04SAndiry Xu 43081da177e4SLinus Torvalds retval = 0; 430948f24970SAlek Du /* notify HCD that we have a device connected and addressed */ 431048f24970SAlek Du if (hcd->driver->update_device) 431148f24970SAlek Du hcd->driver->update_device(hcd, udev); 4312890dae88SMathias Nyman hub_set_initial_usb2_lpm_policy(udev); 43131da177e4SLinus Torvalds fail: 43144326ed0bSAlan Stern if (retval) { 43151da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 43163b29b68bSAlan Stern update_devnum(udev, devnum); /* for disconnect processing */ 43174326ed0bSAlan Stern } 43184186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 43191da177e4SLinus Torvalds return retval; 43201da177e4SLinus Torvalds } 43211da177e4SLinus Torvalds 43221da177e4SLinus Torvalds static void 43231da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 43241da177e4SLinus Torvalds { 43251da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 43261da177e4SLinus Torvalds int status; 43271da177e4SLinus Torvalds 4328e94b1766SChristoph Lameter qual = kmalloc (sizeof *qual, GFP_KERNEL); 43291da177e4SLinus Torvalds if (qual == NULL) 43301da177e4SLinus Torvalds return; 43311da177e4SLinus Torvalds 43321da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 43331da177e4SLinus Torvalds qual, sizeof *qual); 43341da177e4SLinus Torvalds if (status == sizeof *qual) { 43351da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 43361da177e4SLinus Torvalds "connect to a high speed hub\n"); 43371da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 43381da177e4SLinus Torvalds if (hub->has_indicators) { 43391da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 434022f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 434122f6a0f0SShaibal Dutta &hub->leds, 0); 43421da177e4SLinus Torvalds } 43431da177e4SLinus Torvalds } 43441da177e4SLinus Torvalds kfree(qual); 43451da177e4SLinus Torvalds } 43461da177e4SLinus Torvalds 43471da177e4SLinus Torvalds static unsigned 43481da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 43491da177e4SLinus Torvalds { 43501da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 43511da177e4SLinus Torvalds int remaining; 435255c52718SAlan Stern int port1; 43531da177e4SLinus Torvalds 435455c52718SAlan Stern if (!hub->limited_power) 43551da177e4SLinus Torvalds return 0; 43561da177e4SLinus Torvalds 435755c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 435855c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 4359ff823c79SLan Tianyu struct usb_device *udev = hub->ports[port1 - 1]->child; 436055c52718SAlan Stern int delta; 4361430ee58eSSebastian Andrzej Siewior unsigned unit_load; 43621da177e4SLinus Torvalds 43631da177e4SLinus Torvalds if (!udev) 43641da177e4SLinus Torvalds continue; 4365430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(udev)) 4366430ee58eSSebastian Andrzej Siewior unit_load = 150; 4367430ee58eSSebastian Andrzej Siewior else 4368430ee58eSSebastian Andrzej Siewior unit_load = 100; 43691da177e4SLinus Torvalds 4370430ee58eSSebastian Andrzej Siewior /* 4371430ee58eSSebastian Andrzej Siewior * Unconfigured devices may not use more than one unit load, 4372430ee58eSSebastian Andrzej Siewior * or 8mA for OTG ports 4373430ee58eSSebastian Andrzej Siewior */ 43741da177e4SLinus Torvalds if (udev->actconfig) 43758d8479dbSSebastian Andrzej Siewior delta = usb_get_max_power(udev, udev->actconfig); 437655c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 4377430ee58eSSebastian Andrzej Siewior delta = unit_load; 43781da177e4SLinus Torvalds else 437955c52718SAlan Stern delta = 8; 438055c52718SAlan Stern if (delta > hub->mA_per_port) 4381b9cef6c3SWu Fengguang dev_warn(&udev->dev, 4382b9cef6c3SWu Fengguang "%dmA is over %umA budget for port %d!\n", 438355c52718SAlan Stern delta, hub->mA_per_port, port1); 43841da177e4SLinus Torvalds remaining -= delta; 43851da177e4SLinus Torvalds } 43861da177e4SLinus Torvalds if (remaining < 0) { 438755c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 438855c52718SAlan Stern -remaining); 43891da177e4SLinus Torvalds remaining = 0; 43901da177e4SLinus Torvalds } 43911da177e4SLinus Torvalds return remaining; 43921da177e4SLinus Torvalds } 43931da177e4SLinus Torvalds 43941da177e4SLinus Torvalds /* Handle physical or logical connection change events. 43951da177e4SLinus Torvalds * This routine is called when: 43961da177e4SLinus Torvalds * a port connection-change occurs; 43971da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 4398742120c6SMing Lei * usb_reset_and_verify_device() encounters changed descriptors (as from 43991da177e4SLinus Torvalds * a firmware download) 44001da177e4SLinus Torvalds * caller already locked the hub 44011da177e4SLinus Torvalds */ 44021da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 44031da177e4SLinus Torvalds u16 portstatus, u16 portchange) 44041da177e4SLinus Torvalds { 44051da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 44061da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 440790da096eSBalaji Rao struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 440824618b0cSAlan Stern unsigned wHubCharacteristics = 440924618b0cSAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 44108808f00cSAlan Stern struct usb_device *udev; 44111da177e4SLinus Torvalds int status, i; 4412430ee58eSSebastian Andrzej Siewior unsigned unit_load; 44131da177e4SLinus Torvalds 44141da177e4SLinus Torvalds dev_dbg (hub_dev, 44151da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 4416131dec34SSarah Sharp port1, portstatus, portchange, portspeed(hub, portstatus)); 44171da177e4SLinus Torvalds 44181da177e4SLinus Torvalds if (hub->has_indicators) { 44191da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 44201da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 44211da177e4SLinus Torvalds } 44221da177e4SLinus Torvalds 44231da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 44241da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 44251da177e4SLinus Torvalds if (hdev->bus->is_b_host) 442624618b0cSAlan Stern portchange &= ~(USB_PORT_STAT_C_CONNECTION | 442724618b0cSAlan Stern USB_PORT_STAT_C_ENABLE); 44281da177e4SLinus Torvalds #endif 44291da177e4SLinus Torvalds 44308808f00cSAlan Stern /* Try to resuscitate an existing device */ 4431ff823c79SLan Tianyu udev = hub->ports[port1 - 1]->child; 44328808f00cSAlan Stern if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && 44338808f00cSAlan Stern udev->state != USB_STATE_NOTATTACHED) { 44348808f00cSAlan Stern usb_lock_device(udev); 44358808f00cSAlan Stern if (portstatus & USB_PORT_STAT_ENABLE) { 44368808f00cSAlan Stern status = 0; /* Nothing to do */ 44378808f00cSAlan Stern 443884ebc102SAlan Stern #ifdef CONFIG_PM_RUNTIME 44395257d97aSAlan Stern } else if (udev->state == USB_STATE_SUSPENDED && 44405257d97aSAlan Stern udev->persist_enabled) { 44418808f00cSAlan Stern /* For a suspended device, treat this as a 44428808f00cSAlan Stern * remote wakeup event. 44438808f00cSAlan Stern */ 44440534d468SAlan Stern status = usb_remote_wakeup(udev); 44458808f00cSAlan Stern #endif 44468808f00cSAlan Stern 44478808f00cSAlan Stern } else { 44485257d97aSAlan Stern status = -ENODEV; /* Don't resuscitate */ 44498808f00cSAlan Stern } 44508808f00cSAlan Stern usb_unlock_device(udev); 44518808f00cSAlan Stern 44528808f00cSAlan Stern if (status == 0) { 44538808f00cSAlan Stern clear_bit(port1, hub->change_bits); 44548808f00cSAlan Stern return; 44558808f00cSAlan Stern } 44568808f00cSAlan Stern } 44578808f00cSAlan Stern 445824618b0cSAlan Stern /* Disconnect any existing devices under this port */ 4459b76baa81SPeter Chen if (udev) { 4460b76baa81SPeter Chen if (hcd->phy && !hdev->parent && 4461b76baa81SPeter Chen !(portstatus & USB_PORT_STAT_CONNECTION)) 4462ac96511bSPeter Chen usb_phy_notify_disconnect(hcd->phy, udev->speed); 4463ff823c79SLan Tianyu usb_disconnect(&hub->ports[port1 - 1]->child); 4464b76baa81SPeter Chen } 446524618b0cSAlan Stern clear_bit(port1, hub->change_bits); 446624618b0cSAlan Stern 4467253e0572SAlan Stern /* We can forget about a "removed" device when there's a physical 4468253e0572SAlan Stern * disconnect or the connect status changes. 4469253e0572SAlan Stern */ 4470253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4471253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 4472253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 4473253e0572SAlan Stern 44745257d97aSAlan Stern if (portchange & (USB_PORT_STAT_C_CONNECTION | 44755257d97aSAlan Stern USB_PORT_STAT_C_ENABLE)) { 4476ad493e5eSLan Tianyu status = hub_port_debounce_be_stable(hub, port1); 44775257d97aSAlan Stern if (status < 0) { 4478e9e88fb7SAlan Stern if (status != -ENODEV && printk_ratelimit()) 44795257d97aSAlan Stern dev_err(hub_dev, "connect-debounce failed, " 44805257d97aSAlan Stern "port %d disabled\n", port1); 44815257d97aSAlan Stern portstatus &= ~USB_PORT_STAT_CONNECTION; 44825257d97aSAlan Stern } else { 44835257d97aSAlan Stern portstatus = status; 44845257d97aSAlan Stern } 44855257d97aSAlan Stern } 44865257d97aSAlan Stern 4487253e0572SAlan Stern /* Return now if debouncing failed or nothing is connected or 4488253e0572SAlan Stern * the device was "removed". 4489253e0572SAlan Stern */ 4490253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4491253e0572SAlan Stern test_bit(port1, hub->removed_bits)) { 44921da177e4SLinus Torvalds 44931da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 449474ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 44950ed9a57eSAndiry Xu && !port_is_power_on(hub, portstatus)) 44961da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 44971da177e4SLinus Torvalds 44981da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 44991da177e4SLinus Torvalds goto done; 45001da177e4SLinus Torvalds return; 45011da177e4SLinus Torvalds } 4502430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hub->hdev)) 4503430ee58eSSebastian Andrzej Siewior unit_load = 150; 4504430ee58eSSebastian Andrzej Siewior else 4505430ee58eSSebastian Andrzej Siewior unit_load = 100; 45061da177e4SLinus Torvalds 4507e9e88fb7SAlan Stern status = 0; 45081da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 45091da177e4SLinus Torvalds 45101da177e4SLinus Torvalds /* reallocate for each attempt, since references 45111da177e4SLinus Torvalds * to the previous one can escape in various ways 45121da177e4SLinus Torvalds */ 45131da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 45141da177e4SLinus Torvalds if (!udev) { 45151da177e4SLinus Torvalds dev_err (hub_dev, 45161da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 45171da177e4SLinus Torvalds port1); 45181da177e4SLinus Torvalds goto done; 45191da177e4SLinus Torvalds } 45201da177e4SLinus Torvalds 45211da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 452255c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 4523b6956ffaSAlan Stern udev->level = hdev->level + 1; 45248af548dcSInaky Perez-Gonzalez udev->wusb = hub_is_wusb(hub); 45251da177e4SLinus Torvalds 4526131dec34SSarah Sharp /* Only USB 3.0 devices are connected to SuperSpeed hubs. */ 4527131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 4528e7b77172SSarah Sharp udev->speed = USB_SPEED_SUPER; 4529e7b77172SSarah Sharp else 4530e7b77172SSarah Sharp udev->speed = USB_SPEED_UNKNOWN; 4531e7b77172SSarah Sharp 45323b29b68bSAlan Stern choose_devnum(udev); 4533c6515272SSarah Sharp if (udev->devnum <= 0) { 4534c6515272SSarah Sharp status = -ENOTCONN; /* Don't retry */ 4535c6515272SSarah Sharp goto loop; 4536c6515272SSarah Sharp } 4537c6515272SSarah Sharp 4538e7b77172SSarah Sharp /* reset (non-USB 3.0 devices) and get descriptor */ 45391da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 45401da177e4SLinus Torvalds if (status < 0) 45411da177e4SLinus Torvalds goto loop; 45421da177e4SLinus Torvalds 454393362a87SPhil Dibowitz usb_detect_quirks(udev); 454493362a87SPhil Dibowitz if (udev->quirks & USB_QUIRK_DELAY_INIT) 454593362a87SPhil Dibowitz msleep(1000); 454693362a87SPhil Dibowitz 45471da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 45481da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 45491da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 45501da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 45511da177e4SLinus Torvalds * on the parent. 45521da177e4SLinus Torvalds */ 45531da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 4554430ee58eSSebastian Andrzej Siewior && udev->bus_mA <= unit_load) { 45551da177e4SLinus Torvalds u16 devstat; 45561da177e4SLinus Torvalds 45571da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 45581da177e4SLinus Torvalds &devstat); 455915b7336eSAlan Stern if (status) { 45601da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 45611da177e4SLinus Torvalds goto loop_disable; 45621da177e4SLinus Torvalds } 45631da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 45641da177e4SLinus Torvalds dev_err(&udev->dev, 45651da177e4SLinus Torvalds "can't connect bus-powered hub " 45661da177e4SLinus Torvalds "to this port\n"); 45671da177e4SLinus Torvalds if (hub->has_indicators) { 45681da177e4SLinus Torvalds hub->indicator[port1-1] = 45691da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 457022f6a0f0SShaibal Dutta queue_delayed_work( 457122f6a0f0SShaibal Dutta system_power_efficient_wq, 457222f6a0f0SShaibal Dutta &hub->leds, 0); 45731da177e4SLinus Torvalds } 45741da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 45751da177e4SLinus Torvalds goto loop_disable; 45761da177e4SLinus Torvalds } 45771da177e4SLinus Torvalds } 45781da177e4SLinus Torvalds 45791da177e4SLinus Torvalds /* check for devices running slower than they could */ 45801da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 45811da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 45821da177e4SLinus Torvalds && highspeed_hubs != 0) 45831da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 45841da177e4SLinus Torvalds 4585fa286188SGreg Kroah-Hartman /* Store the parent's children[] pointer. At this point 45861da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 45871da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 45881da177e4SLinus Torvalds */ 45891da177e4SLinus Torvalds status = 0; 45901da177e4SLinus Torvalds 45911da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 45921da177e4SLinus Torvalds * been disconnected; we would race with the 45931da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 45941da177e4SLinus Torvalds */ 45951da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 45961da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 45971da177e4SLinus Torvalds status = -ENOTCONN; 45981da177e4SLinus Torvalds else 4599ff823c79SLan Tianyu hub->ports[port1 - 1]->child = udev; 46001da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 46011da177e4SLinus Torvalds 46021da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 46031da177e4SLinus Torvalds if (!status) { 46041da177e4SLinus Torvalds status = usb_new_device(udev); 46051da177e4SLinus Torvalds if (status) { 46061da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 4607ff823c79SLan Tianyu hub->ports[port1 - 1]->child = NULL; 46081da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 46091da177e4SLinus Torvalds } 46101da177e4SLinus Torvalds } 46111da177e4SLinus Torvalds 46121da177e4SLinus Torvalds if (status) 46131da177e4SLinus Torvalds goto loop_disable; 46141da177e4SLinus Torvalds 46151da177e4SLinus Torvalds status = hub_power_remaining(hub); 46161da177e4SLinus Torvalds if (status) 461755c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 46181da177e4SLinus Torvalds 46191da177e4SLinus Torvalds return; 46201da177e4SLinus Torvalds 46211da177e4SLinus Torvalds loop_disable: 46221da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 46231da177e4SLinus Torvalds loop: 4624fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 46253b29b68bSAlan Stern release_devnum(udev); 4626f7410cedSHerbert Xu hub_free_dev(udev); 46271da177e4SLinus Torvalds usb_put_dev(udev); 4628ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 46291da177e4SLinus Torvalds break; 46301da177e4SLinus Torvalds } 46313a31155cSAlan Stern if (hub->hdev->parent || 46323a31155cSAlan Stern !hcd->driver->port_handed_over || 4633e9e88fb7SAlan Stern !(hcd->driver->port_handed_over)(hcd, port1)) { 4634e9e88fb7SAlan Stern if (status != -ENOTCONN && status != -ENODEV) 46353a31155cSAlan Stern dev_err(hub_dev, "unable to enumerate USB device on port %d\n", 46363a31155cSAlan Stern port1); 4637e9e88fb7SAlan Stern } 46381da177e4SLinus Torvalds 46391da177e4SLinus Torvalds done: 46401da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 464190da096eSBalaji Rao if (hcd->driver->relinquish_port && !hub->hdev->parent) 464290da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 46431da177e4SLinus Torvalds } 46441da177e4SLinus Torvalds 4645714b07beSSarah Sharp /* Returns 1 if there was a remote wakeup and a connect status change. */ 4646714b07beSSarah Sharp static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, 464772937e1eSSarah Sharp u16 portstatus, u16 portchange) 4648714b07beSSarah Sharp { 4649714b07beSSarah Sharp struct usb_device *hdev; 4650714b07beSSarah Sharp struct usb_device *udev; 4651714b07beSSarah Sharp int connect_change = 0; 4652714b07beSSarah Sharp int ret; 4653714b07beSSarah Sharp 4654714b07beSSarah Sharp hdev = hub->hdev; 4655ff823c79SLan Tianyu udev = hub->ports[port - 1]->child; 46564ee823b8SSarah Sharp if (!hub_is_superspeed(hdev)) { 4657714b07beSSarah Sharp if (!(portchange & USB_PORT_STAT_C_SUSPEND)) 4658714b07beSSarah Sharp return 0; 4659ad493e5eSLan Tianyu usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); 46604ee823b8SSarah Sharp } else { 46614ee823b8SSarah Sharp if (!udev || udev->state != USB_STATE_SUSPENDED || 466272937e1eSSarah Sharp (portstatus & USB_PORT_STAT_LINK_STATE) != 466372937e1eSSarah Sharp USB_SS_PORT_LS_U0) 46644ee823b8SSarah Sharp return 0; 46654ee823b8SSarah Sharp } 4666714b07beSSarah Sharp 4667714b07beSSarah Sharp if (udev) { 4668714b07beSSarah Sharp /* TRSMRCY = 10 msec */ 4669714b07beSSarah Sharp msleep(10); 4670714b07beSSarah Sharp 4671714b07beSSarah Sharp usb_lock_device(udev); 4672714b07beSSarah Sharp ret = usb_remote_wakeup(udev); 4673714b07beSSarah Sharp usb_unlock_device(udev); 4674714b07beSSarah Sharp if (ret < 0) 4675714b07beSSarah Sharp connect_change = 1; 4676714b07beSSarah Sharp } else { 4677714b07beSSarah Sharp ret = -ENODEV; 4678714b07beSSarah Sharp hub_port_disable(hub, port, 1); 4679714b07beSSarah Sharp } 4680714b07beSSarah Sharp dev_dbg(hub->intfdev, "resume on port %d, status %d\n", 4681714b07beSSarah Sharp port, ret); 4682714b07beSSarah Sharp return connect_change; 4683714b07beSSarah Sharp } 4684714b07beSSarah Sharp 46851da177e4SLinus Torvalds static void hub_events(void) 46861da177e4SLinus Torvalds { 46871da177e4SLinus Torvalds struct list_head *tmp; 46881da177e4SLinus Torvalds struct usb_device *hdev; 46891da177e4SLinus Torvalds struct usb_interface *intf; 46901da177e4SLinus Torvalds struct usb_hub *hub; 46911da177e4SLinus Torvalds struct device *hub_dev; 46921da177e4SLinus Torvalds u16 hubstatus; 46931da177e4SLinus Torvalds u16 hubchange; 46941da177e4SLinus Torvalds u16 portstatus; 46951da177e4SLinus Torvalds u16 portchange; 46961da177e4SLinus Torvalds int i, ret; 46974ee823b8SSarah Sharp int connect_change, wakeup_change; 46981da177e4SLinus Torvalds 46991da177e4SLinus Torvalds /* 47001da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 47011da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 47021da177e4SLinus Torvalds * safe since we delete the hub from the event list. 47031da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 47041da177e4SLinus Torvalds */ 47051da177e4SLinus Torvalds while (1) { 47061da177e4SLinus Torvalds 47071da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 47081da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 47091da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 47101da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 47111da177e4SLinus Torvalds break; 47121da177e4SLinus Torvalds } 47131da177e4SLinus Torvalds 47141da177e4SLinus Torvalds tmp = hub_event_list.next; 47151da177e4SLinus Torvalds list_del_init(tmp); 47161da177e4SLinus Torvalds 47171da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 4718e8054854SAlan Stern kref_get(&hub->kref); 4719e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 47201da177e4SLinus Torvalds 4721e8054854SAlan Stern hdev = hub->hdev; 4722e8054854SAlan Stern hub_dev = hub->intfdev; 4723e8054854SAlan Stern intf = to_usb_interface(hub_dev); 472440f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 47253bbc47d8SKrzysztof Mazur hdev->state, hdev->maxchild, 47261da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 47271da177e4SLinus Torvalds (u16) hub->change_bits[0], 472840f122f3SAlan Stern (u16) hub->event_bits[0]); 47291da177e4SLinus Torvalds 47301da177e4SLinus Torvalds /* Lock the device, then check to see if we were 47311da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 473206b84e8aSAlan Stern usb_lock_device(hdev); 4733e8054854SAlan Stern if (unlikely(hub->disconnected)) 47349bbdf1e0SAlan Stern goto loop_disconnected; 47351da177e4SLinus Torvalds 47361da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 47371da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 47387de18d8bSAlan Stern hub->error = -ENODEV; 47394330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 47401da177e4SLinus Torvalds goto loop; 47411da177e4SLinus Torvalds } 47421da177e4SLinus Torvalds 474340f122f3SAlan Stern /* Autoresume */ 474440f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 474540f122f3SAlan Stern if (ret) { 474640f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 47471da177e4SLinus Torvalds goto loop; 474840f122f3SAlan Stern } 474940f122f3SAlan Stern 475040f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 475140f122f3SAlan Stern if (hub->quiescing) 475240f122f3SAlan Stern goto loop_autopm; 47531da177e4SLinus Torvalds 47541da177e4SLinus Torvalds if (hub->error) { 47551da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 47561da177e4SLinus Torvalds hub->error); 47571da177e4SLinus Torvalds 4758742120c6SMing Lei ret = usb_reset_device(hdev); 47591da177e4SLinus Torvalds if (ret) { 47601da177e4SLinus Torvalds dev_dbg (hub_dev, 47611da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 476240f122f3SAlan Stern goto loop_autopm; 47631da177e4SLinus Torvalds } 47641da177e4SLinus Torvalds 47651da177e4SLinus Torvalds hub->nerrors = 0; 47661da177e4SLinus Torvalds hub->error = 0; 47671da177e4SLinus Torvalds } 47681da177e4SLinus Torvalds 47691da177e4SLinus Torvalds /* deal with port status changes */ 47703bbc47d8SKrzysztof Mazur for (i = 1; i <= hdev->maxchild; i++) { 4771a82b76f7SHans de Goede struct usb_device *udev = hub->ports[i - 1]->child; 4772a82b76f7SHans de Goede 47731da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 47741da177e4SLinus Torvalds continue; 47751da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 477672937e1eSSarah Sharp wakeup_change = test_and_clear_bit(i, hub->wakeup_bits); 47771da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 47784ee823b8SSarah Sharp !connect_change && !wakeup_change) 47791da177e4SLinus Torvalds continue; 47801da177e4SLinus Torvalds 47811da177e4SLinus Torvalds ret = hub_port_status(hub, i, 47821da177e4SLinus Torvalds &portstatus, &portchange); 47831da177e4SLinus Torvalds if (ret < 0) 47841da177e4SLinus Torvalds continue; 47851da177e4SLinus Torvalds 47861da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 4787ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 47881da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 47891da177e4SLinus Torvalds connect_change = 1; 47901da177e4SLinus Torvalds } 47911da177e4SLinus Torvalds 47921da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 47931da177e4SLinus Torvalds if (!connect_change) 47941da177e4SLinus Torvalds dev_dbg (hub_dev, 47951da177e4SLinus Torvalds "port %d enable change, " 47961da177e4SLinus Torvalds "status %08x\n", 47971da177e4SLinus Torvalds i, portstatus); 4798ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 47991da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 48001da177e4SLinus Torvalds 48011da177e4SLinus Torvalds /* 48021da177e4SLinus Torvalds * EM interference sometimes causes badly 48031da177e4SLinus Torvalds * shielded USB devices to be shutdown by 48041da177e4SLinus Torvalds * the hub, this hack enables them again. 48051da177e4SLinus Torvalds * Works at least with mouse driver. 48061da177e4SLinus Torvalds */ 48071da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 48081da177e4SLinus Torvalds && !connect_change 4809ff823c79SLan Tianyu && hub->ports[i - 1]->child) { 48101da177e4SLinus Torvalds dev_err (hub_dev, 48111da177e4SLinus Torvalds "port %i " 48121da177e4SLinus Torvalds "disabled by hub (EMI?), " 48131da177e4SLinus Torvalds "re-enabling...\n", 48141da177e4SLinus Torvalds i); 48151da177e4SLinus Torvalds connect_change = 1; 48161da177e4SLinus Torvalds } 48171da177e4SLinus Torvalds } 48181da177e4SLinus Torvalds 481972937e1eSSarah Sharp if (hub_handle_remote_wakeup(hub, i, 482072937e1eSSarah Sharp portstatus, portchange)) 48211da177e4SLinus Torvalds connect_change = 1; 48221da177e4SLinus Torvalds 48231da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 4824752d57a8SPaul Bolle u16 status = 0; 4825752d57a8SPaul Bolle u16 unused; 4826752d57a8SPaul Bolle 4827752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change on port " 4828752d57a8SPaul Bolle "%d\n", i); 4829ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 48301da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 4831752d57a8SPaul Bolle msleep(100); /* Cool down */ 48328520f380SAlan Stern hub_power_on(hub, true); 4833752d57a8SPaul Bolle hub_port_status(hub, i, &status, &unused); 4834752d57a8SPaul Bolle if (status & USB_PORT_STAT_OVERCURRENT) 4835752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 4836752d57a8SPaul Bolle "condition on port %d\n", i); 48371da177e4SLinus Torvalds } 48381da177e4SLinus Torvalds 48391da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 48401da177e4SLinus Torvalds dev_dbg (hub_dev, 48411da177e4SLinus Torvalds "reset change on port %d\n", 48421da177e4SLinus Torvalds i); 4843ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 48441da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 48451da177e4SLinus Torvalds } 4846c7061574SSarah Sharp if ((portchange & USB_PORT_STAT_C_BH_RESET) && 4847c7061574SSarah Sharp hub_is_superspeed(hub->hdev)) { 4848c7061574SSarah Sharp dev_dbg(hub_dev, 4849c7061574SSarah Sharp "warm reset change on port %d\n", 4850c7061574SSarah Sharp i); 4851ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 4852c7061574SSarah Sharp USB_PORT_FEAT_C_BH_PORT_RESET); 4853c7061574SSarah Sharp } 4854dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_LINK_STATE) { 4855ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, i, 4856dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_LINK_STATE); 4857dbe79bbeSJohn Youn } 4858dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { 4859dbe79bbeSJohn Youn dev_warn(hub_dev, 4860dbe79bbeSJohn Youn "config error on port %d\n", 4861dbe79bbeSJohn Youn i); 4862ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, i, 4863dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_CONFIG_ERROR); 4864dbe79bbeSJohn Youn } 48651da177e4SLinus Torvalds 48665e467f6eSAndiry Xu /* Warm reset a USB3 protocol port if it's in 48675e467f6eSAndiry Xu * SS.Inactive state. 48685e467f6eSAndiry Xu */ 48698bea2bd3SStanislaw Ledwon if (hub_port_warm_reset_required(hub, portstatus)) { 487065bdac5eSSarah Sharp int status; 487165bdac5eSSarah Sharp 48725e467f6eSAndiry Xu dev_dbg(hub_dev, "warm reset port %d\n", i); 48732d51f3cdSJulius Werner if (!udev || 48742d51f3cdSJulius Werner !(portstatus & USB_PORT_STAT_CONNECTION) || 48752d51f3cdSJulius Werner udev->state == USB_STATE_NOTATTACHED) { 4876d3b9d7a9SSarah Sharp status = hub_port_reset(hub, i, 4877d3b9d7a9SSarah Sharp NULL, HUB_BH_RESET_TIME, 4878d3b9d7a9SSarah Sharp true); 487965bdac5eSSarah Sharp if (status < 0) 488065bdac5eSSarah Sharp hub_port_disable(hub, i, 1); 4881d3b9d7a9SSarah Sharp } else { 4882d3b9d7a9SSarah Sharp usb_lock_device(udev); 4883d3b9d7a9SSarah Sharp status = usb_reset_device(udev); 4884d3b9d7a9SSarah Sharp usb_unlock_device(udev); 488565bdac5eSSarah Sharp connect_change = 0; 48865e467f6eSAndiry Xu } 4887a82b76f7SHans de Goede /* 4888a82b76f7SHans de Goede * On disconnect USB3 protocol ports transit from U0 to 4889a82b76f7SHans de Goede * SS.Inactive to Rx.Detect. If this happens a warm- 4890a82b76f7SHans de Goede * reset is not needed, but a (re)connect may happen 4891a82b76f7SHans de Goede * before khubd runs and sees the disconnect, and the 4892a82b76f7SHans de Goede * device may be an unknown state. 4893a82b76f7SHans de Goede * 4894a82b76f7SHans de Goede * If the port went through SS.Inactive without khubd 4895a82b76f7SHans de Goede * seeing it the C_LINK_STATE change flag will be set, 4896a82b76f7SHans de Goede * and we reset the dev to put it in a known state. 4897a82b76f7SHans de Goede */ 4898a82b76f7SHans de Goede } else if (udev && hub_is_superspeed(hub->hdev) && 4899a82b76f7SHans de Goede (portchange & USB_PORT_STAT_C_LINK_STATE) && 4900a82b76f7SHans de Goede (portstatus & USB_PORT_STAT_CONNECTION)) { 4901a82b76f7SHans de Goede usb_lock_device(udev); 4902a82b76f7SHans de Goede usb_reset_device(udev); 4903a82b76f7SHans de Goede usb_unlock_device(udev); 4904a82b76f7SHans de Goede connect_change = 0; 4905f3e94aa1SJulius Werner } 49065e467f6eSAndiry Xu 49071da177e4SLinus Torvalds if (connect_change) 49081da177e4SLinus Torvalds hub_port_connect_change(hub, i, 49091da177e4SLinus Torvalds portstatus, portchange); 49101da177e4SLinus Torvalds } /* end for i */ 49111da177e4SLinus Torvalds 49121da177e4SLinus Torvalds /* deal with hub status changes */ 49131da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 49141da177e4SLinus Torvalds ; /* do nothing */ 49151da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 49161da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 49171da177e4SLinus Torvalds else { 49181da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 49191da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 49201da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 492155c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 492255c52718SAlan Stern /* FIXME: Is this always true? */ 492355c52718SAlan Stern hub->limited_power = 1; 4924403fae78Sjidong xiao else 4925403fae78Sjidong xiao hub->limited_power = 0; 49261da177e4SLinus Torvalds } 49271da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 4928752d57a8SPaul Bolle u16 status = 0; 4929752d57a8SPaul Bolle u16 unused; 4930752d57a8SPaul Bolle 4931752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change\n"); 49321da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 4933752d57a8SPaul Bolle msleep(500); /* Cool down */ 49348520f380SAlan Stern hub_power_on(hub, true); 4935752d57a8SPaul Bolle hub_hub_status(hub, &status, &unused); 4936752d57a8SPaul Bolle if (status & HUB_STATUS_OVERCURRENT) 4937752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 4938752d57a8SPaul Bolle "condition\n"); 49391da177e4SLinus Torvalds } 49401da177e4SLinus Torvalds } 49411da177e4SLinus Torvalds 494240f122f3SAlan Stern loop_autopm: 49438e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface() above */ 49448e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 49451da177e4SLinus Torvalds loop: 49468e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface_no_resume() in 49478e4ceb38SAlan Stern * kick_khubd() and allow autosuspend. 49488e4ceb38SAlan Stern */ 49498e4ceb38SAlan Stern usb_autopm_put_interface(intf); 49509bbdf1e0SAlan Stern loop_disconnected: 49511da177e4SLinus Torvalds usb_unlock_device(hdev); 4952e8054854SAlan Stern kref_put(&hub->kref, hub_release); 49531da177e4SLinus Torvalds 49541da177e4SLinus Torvalds } /* end while (1) */ 49551da177e4SLinus Torvalds } 49561da177e4SLinus Torvalds 49571da177e4SLinus Torvalds static int hub_thread(void *__unused) 49581da177e4SLinus Torvalds { 4959025d4430SRahul Bedarkar /* khubd needs to be freezable to avoid interfering with USB-PERSIST 49603bb1af52SAlan Stern * port handover. Otherwise it might see that a full-speed device 49613bb1af52SAlan Stern * was gone before the EHCI controller had handed its port over to 49623bb1af52SAlan Stern * the companion full-speed controller. 49633bb1af52SAlan Stern */ 496483144186SRafael J. Wysocki set_freezable(); 49653bb1af52SAlan Stern 49661da177e4SLinus Torvalds do { 49671da177e4SLinus Torvalds hub_events(); 4968e42837bcSRafael J. Wysocki wait_event_freezable(khubd_wait, 49699c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 49709c8d6178Sakpm@osdl.org kthread_should_stop()); 49719c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 49721da177e4SLinus Torvalds 49731da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 49749c8d6178Sakpm@osdl.org return 0; 49751da177e4SLinus Torvalds } 49761da177e4SLinus Torvalds 49771e927d96SNémeth Márton static const struct usb_device_id hub_id_table[] = { 4978e6f30deaSMing Lei { .match_flags = USB_DEVICE_ID_MATCH_VENDOR 4979e6f30deaSMing Lei | USB_DEVICE_ID_MATCH_INT_CLASS, 4980e6f30deaSMing Lei .idVendor = USB_VENDOR_GENESYS_LOGIC, 4981e6f30deaSMing Lei .bInterfaceClass = USB_CLASS_HUB, 4982e6f30deaSMing Lei .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, 49831da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 49841da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 49851da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 49861da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 49871da177e4SLinus Torvalds { } /* Terminating entry */ 49881da177e4SLinus Torvalds }; 49891da177e4SLinus Torvalds 49901da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 49911da177e4SLinus Torvalds 49921da177e4SLinus Torvalds static struct usb_driver hub_driver = { 49931da177e4SLinus Torvalds .name = "hub", 49941da177e4SLinus Torvalds .probe = hub_probe, 49951da177e4SLinus Torvalds .disconnect = hub_disconnect, 49961da177e4SLinus Torvalds .suspend = hub_suspend, 49971da177e4SLinus Torvalds .resume = hub_resume, 4998f07600cfSAlan Stern .reset_resume = hub_reset_resume, 49997de18d8bSAlan Stern .pre_reset = hub_pre_reset, 50007de18d8bSAlan Stern .post_reset = hub_post_reset, 5001c532b29aSAndi Kleen .unlocked_ioctl = hub_ioctl, 50021da177e4SLinus Torvalds .id_table = hub_id_table, 500340f122f3SAlan Stern .supports_autosuspend = 1, 50041da177e4SLinus Torvalds }; 50051da177e4SLinus Torvalds 50061da177e4SLinus Torvalds int usb_hub_init(void) 50071da177e4SLinus Torvalds { 50081da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 50091da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 50101da177e4SLinus Torvalds usbcore_name); 50111da177e4SLinus Torvalds return -1; 50121da177e4SLinus Torvalds } 50131da177e4SLinus Torvalds 50149c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 50159c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 50161da177e4SLinus Torvalds return 0; 50171da177e4SLinus Torvalds 50181da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 50191da177e4SLinus Torvalds usb_deregister(&hub_driver); 50201da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 50211da177e4SLinus Torvalds 50221da177e4SLinus Torvalds return -1; 50231da177e4SLinus Torvalds } 50241da177e4SLinus Torvalds 50251da177e4SLinus Torvalds void usb_hub_cleanup(void) 50261da177e4SLinus Torvalds { 50279c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 50281da177e4SLinus Torvalds 50291da177e4SLinus Torvalds /* 50301da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 50311da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 50321da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 50331da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 50341da177e4SLinus Torvalds * individual hub resources. -greg 50351da177e4SLinus Torvalds */ 50361da177e4SLinus Torvalds usb_deregister(&hub_driver); 50371da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 50381da177e4SLinus Torvalds 5039eb764c4bSAlan Stern static int descriptors_changed(struct usb_device *udev, 5040e3376d6cSXenia Ragiadakou struct usb_device_descriptor *old_device_descriptor, 5041e3376d6cSXenia Ragiadakou struct usb_host_bos *old_bos) 50421da177e4SLinus Torvalds { 5043eb764c4bSAlan Stern int changed = 0; 50441da177e4SLinus Torvalds unsigned index; 5045eb764c4bSAlan Stern unsigned serial_len = 0; 5046eb764c4bSAlan Stern unsigned len; 5047eb764c4bSAlan Stern unsigned old_length; 5048eb764c4bSAlan Stern int length; 5049eb764c4bSAlan Stern char *buf; 50501da177e4SLinus Torvalds 5051eb764c4bSAlan Stern if (memcmp(&udev->descriptor, old_device_descriptor, 5052eb764c4bSAlan Stern sizeof(*old_device_descriptor)) != 0) 5053eb764c4bSAlan Stern return 1; 5054eb764c4bSAlan Stern 5055e3376d6cSXenia Ragiadakou if ((old_bos && !udev->bos) || (!old_bos && udev->bos)) 5056e3376d6cSXenia Ragiadakou return 1; 5057e3376d6cSXenia Ragiadakou if (udev->bos) { 5058b9a10481SXenia Ragiadakou len = le16_to_cpu(udev->bos->desc->wTotalLength); 5059b9a10481SXenia Ragiadakou if (len != le16_to_cpu(old_bos->desc->wTotalLength)) 5060e3376d6cSXenia Ragiadakou return 1; 5061b9a10481SXenia Ragiadakou if (memcmp(udev->bos->desc, old_bos->desc, len)) 5062e3376d6cSXenia Ragiadakou return 1; 5063e3376d6cSXenia Ragiadakou } 5064e3376d6cSXenia Ragiadakou 5065eb764c4bSAlan Stern /* Since the idVendor, idProduct, and bcdDevice values in the 5066eb764c4bSAlan Stern * device descriptor haven't changed, we will assume the 5067eb764c4bSAlan Stern * Manufacturer and Product strings haven't changed either. 5068eb764c4bSAlan Stern * But the SerialNumber string could be different (e.g., a 5069eb764c4bSAlan Stern * different flash card of the same brand). 5070eb764c4bSAlan Stern */ 5071eb764c4bSAlan Stern if (udev->serial) 5072eb764c4bSAlan Stern serial_len = strlen(udev->serial) + 1; 5073eb764c4bSAlan Stern 5074eb764c4bSAlan Stern len = serial_len; 50751da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 5076eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 5077eb764c4bSAlan Stern len = max(len, old_length); 50781da177e4SLinus Torvalds } 5079eb764c4bSAlan Stern 50800cc1a51fSOliver Neukum buf = kmalloc(len, GFP_NOIO); 50811da177e4SLinus Torvalds if (buf == NULL) { 50821da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 50831da177e4SLinus Torvalds /* assume the worst */ 50841da177e4SLinus Torvalds return 1; 50851da177e4SLinus Torvalds } 50861da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 5087eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 50881da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 50891da177e4SLinus Torvalds old_length); 5090eb764c4bSAlan Stern if (length != old_length) { 50911da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 50921da177e4SLinus Torvalds index, length); 5093eb764c4bSAlan Stern changed = 1; 50941da177e4SLinus Torvalds break; 50951da177e4SLinus Torvalds } 50961da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 50971da177e4SLinus Torvalds != 0) { 50981da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 5099eb764c4bSAlan Stern index, 5100eb764c4bSAlan Stern ((struct usb_config_descriptor *) buf)-> 5101eb764c4bSAlan Stern bConfigurationValue); 5102eb764c4bSAlan Stern changed = 1; 51031da177e4SLinus Torvalds break; 51041da177e4SLinus Torvalds } 51051da177e4SLinus Torvalds } 5106eb764c4bSAlan Stern 5107eb764c4bSAlan Stern if (!changed && serial_len) { 5108eb764c4bSAlan Stern length = usb_string(udev, udev->descriptor.iSerialNumber, 5109eb764c4bSAlan Stern buf, serial_len); 5110eb764c4bSAlan Stern if (length + 1 != serial_len) { 5111eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string error %d\n", 5112eb764c4bSAlan Stern length); 5113eb764c4bSAlan Stern changed = 1; 5114eb764c4bSAlan Stern } else if (memcmp(buf, udev->serial, length) != 0) { 5115eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string changed\n"); 5116eb764c4bSAlan Stern changed = 1; 5117eb764c4bSAlan Stern } 5118eb764c4bSAlan Stern } 5119eb764c4bSAlan Stern 51201da177e4SLinus Torvalds kfree(buf); 5121eb764c4bSAlan Stern return changed; 51221da177e4SLinus Torvalds } 51231da177e4SLinus Torvalds 51241da177e4SLinus Torvalds /** 5125742120c6SMing Lei * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device 51261da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 51271da177e4SLinus Torvalds * 512879efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 512979efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 5130742120c6SMing Lei * Use usb_reset_device() instead. 51311da177e4SLinus Torvalds * 51321da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 51331da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 51341da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 51351da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 51361da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 51371da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 51381da177e4SLinus Torvalds * re-enumerated and probed all over again. 51391da177e4SLinus Torvalds * 5140626f090cSYacine Belkadi * Return: 0 if the reset succeeded, -ENODEV if the device has been 51411da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 51421da177e4SLinus Torvalds * if the reset wasn't even attempted. 51431da177e4SLinus Torvalds * 5144626f090cSYacine Belkadi * Note: 51451da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 51461da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 51471da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 51481da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 51496bc6cff5SAlan Stern * 51506bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 51516bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 51526bc6cff5SAlan Stern * holding the device lock because these tasks should always call 51536bc6cff5SAlan Stern * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. 51541da177e4SLinus Torvalds */ 5155742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev) 51561da177e4SLinus Torvalds { 51571da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 51581da177e4SLinus Torvalds struct usb_hub *parent_hub; 51593f0479e0SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 51601da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 5161e3376d6cSXenia Ragiadakou struct usb_host_bos *bos; 51627a7b562dSHans de Goede int i, j, ret = 0; 516312c3da34SAlan Stern int port1 = udev->portnum; 51641da177e4SLinus Torvalds 51651da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 51661da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 51671da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 51681da177e4SLinus Torvalds udev->state); 51691da177e4SLinus Torvalds return -EINVAL; 51701da177e4SLinus Torvalds } 51711da177e4SLinus Torvalds 51721da177e4SLinus Torvalds if (!parent_hdev) { 51734bec9917SWolfram Sang /* this requires hcd-specific logic; see ohci_restart() */ 5174441b62c1SHarvey Harrison dev_dbg(&udev->dev, "%s for root hub!\n", __func__); 51751da177e4SLinus Torvalds return -EISDIR; 51761da177e4SLinus Torvalds } 5177ad493e5eSLan Tianyu parent_hub = usb_hub_to_struct_hub(parent_hdev); 51781da177e4SLinus Torvalds 5179dcc01c08SSarah Sharp /* Disable USB2 hardware LPM. 5180dcc01c08SSarah Sharp * It will be re-enabled by the enumeration process. 5181dcc01c08SSarah Sharp */ 5182dcc01c08SSarah Sharp if (udev->usb2_hw_lpm_enabled == 1) 5183dcc01c08SSarah Sharp usb_set_usb2_hardware_lpm(udev, 0); 5184dcc01c08SSarah Sharp 5185e3376d6cSXenia Ragiadakou bos = udev->bos; 5186e3376d6cSXenia Ragiadakou udev->bos = NULL; 5187e3376d6cSXenia Ragiadakou 5188f74631e3SSarah Sharp /* Disable LPM and LTM while we reset the device and reinstall the alt 5189f74631e3SSarah Sharp * settings. Device-initiated LPM settings, and system exit latency 5190f74631e3SSarah Sharp * settings are cleared when the device is reset, so we have to set 5191f74631e3SSarah Sharp * them up again. 51926d1d0513SSarah Sharp */ 51936d1d0513SSarah Sharp ret = usb_unlocked_disable_lpm(udev); 51946d1d0513SSarah Sharp if (ret) { 51956d1d0513SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__); 51966d1d0513SSarah Sharp goto re_enumerate; 51976d1d0513SSarah Sharp } 5198f74631e3SSarah Sharp ret = usb_disable_ltm(udev); 5199f74631e3SSarah Sharp if (ret) { 5200f74631e3SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LTM\n.", 5201f74631e3SSarah Sharp __func__); 5202f74631e3SSarah Sharp goto re_enumerate; 5203f74631e3SSarah Sharp } 52046d1d0513SSarah Sharp 52051da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 52061da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 52071da177e4SLinus Torvalds 52081da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 52091da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 5210fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 52111da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 5212dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 52131da177e4SLinus Torvalds break; 52141da177e4SLinus Torvalds } 52151da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 5216d5cbad4bSAlan Stern 52171da177e4SLinus Torvalds if (ret < 0) 52181da177e4SLinus Torvalds goto re_enumerate; 52191da177e4SLinus Torvalds 52201da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 5221e3376d6cSXenia Ragiadakou if (descriptors_changed(udev, &descriptor, bos)) { 52221da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 52231da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 52241da177e4SLinus Torvalds goto re_enumerate; 52251da177e4SLinus Torvalds } 52261da177e4SLinus Torvalds 52274fe0387aSAlan Stern /* Restore the device's previous configuration */ 52281da177e4SLinus Torvalds if (!udev->actconfig) 52291da177e4SLinus Torvalds goto done; 52303f0479e0SSarah Sharp 5231d673bfcbSSarah Sharp mutex_lock(hcd->bandwidth_mutex); 52323f0479e0SSarah Sharp ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); 52333f0479e0SSarah Sharp if (ret < 0) { 52343f0479e0SSarah Sharp dev_warn(&udev->dev, 52353f0479e0SSarah Sharp "Busted HC? Not enough HCD resources for " 52363f0479e0SSarah Sharp "old configuration.\n"); 5237d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 52383f0479e0SSarah Sharp goto re_enumerate; 52393f0479e0SSarah Sharp } 52401da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 52411da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 52421da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 52431da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 52441da177e4SLinus Torvalds if (ret < 0) { 52451da177e4SLinus Torvalds dev_err(&udev->dev, 52461da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 52471da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 5248d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 52491da177e4SLinus Torvalds goto re_enumerate; 52501da177e4SLinus Torvalds } 5251d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 52521da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 52531da177e4SLinus Torvalds 52544fe0387aSAlan Stern /* Put interfaces back into the same altsettings as before. 52554fe0387aSAlan Stern * Don't bother to send the Set-Interface request for interfaces 52564fe0387aSAlan Stern * that were already in altsetting 0; besides being unnecessary, 52574fe0387aSAlan Stern * many devices can't handle it. Instead just reset the host-side 52584fe0387aSAlan Stern * endpoint state. 52594fe0387aSAlan Stern */ 52601da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 52613f0479e0SSarah Sharp struct usb_host_config *config = udev->actconfig; 52623f0479e0SSarah Sharp struct usb_interface *intf = config->interface[i]; 52631da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 52641da177e4SLinus Torvalds 52651da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 52664fe0387aSAlan Stern if (desc->bAlternateSetting == 0) { 52674fe0387aSAlan Stern usb_disable_interface(udev, intf, true); 52684fe0387aSAlan Stern usb_enable_interface(udev, intf, true); 52694fe0387aSAlan Stern ret = 0; 52704fe0387aSAlan Stern } else { 527104a723eaSSarah Sharp /* Let the bandwidth allocation function know that this 527204a723eaSSarah Sharp * device has been reset, and it will have to use 527304a723eaSSarah Sharp * alternate setting 0 as the current alternate setting. 52743f0479e0SSarah Sharp */ 527504a723eaSSarah Sharp intf->resetting_device = 1; 52761da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 52771da177e4SLinus Torvalds desc->bAlternateSetting); 527804a723eaSSarah Sharp intf->resetting_device = 0; 52794fe0387aSAlan Stern } 52801da177e4SLinus Torvalds if (ret < 0) { 52811da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 52821da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 52831da177e4SLinus Torvalds desc->bInterfaceNumber, 52841da177e4SLinus Torvalds desc->bAlternateSetting, 52851da177e4SLinus Torvalds ret); 52861da177e4SLinus Torvalds goto re_enumerate; 52871da177e4SLinus Torvalds } 52887a7b562dSHans de Goede /* Resetting also frees any allocated streams */ 52897a7b562dSHans de Goede for (j = 0; j < intf->cur_altsetting->desc.bNumEndpoints; j++) 52907a7b562dSHans de Goede intf->cur_altsetting->endpoint[j].streams = 0; 52911da177e4SLinus Torvalds } 52921da177e4SLinus Torvalds 52931da177e4SLinus Torvalds done: 5294f74631e3SSarah Sharp /* Now that the alt settings are re-installed, enable LTM and LPM. */ 5295de68bab4SSarah Sharp usb_set_usb2_hardware_lpm(udev, 1); 529678d9a487SAlan Stern usb_unlocked_enable_lpm(udev); 5297f74631e3SSarah Sharp usb_enable_ltm(udev); 5298e3376d6cSXenia Ragiadakou usb_release_bos_descriptor(udev); 5299e3376d6cSXenia Ragiadakou udev->bos = bos; 53001da177e4SLinus Torvalds return 0; 53011da177e4SLinus Torvalds 53021da177e4SLinus Torvalds re_enumerate: 53036d1d0513SSarah Sharp /* LPM state doesn't matter when we're about to destroy the device. */ 53041da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 5305e3376d6cSXenia Ragiadakou usb_release_bos_descriptor(udev); 5306e3376d6cSXenia Ragiadakou udev->bos = bos; 53071da177e4SLinus Torvalds return -ENODEV; 53081da177e4SLinus Torvalds } 53091da177e4SLinus Torvalds 53101da177e4SLinus Torvalds /** 53111da177e4SLinus Torvalds * usb_reset_device - warn interface drivers and perform a USB port reset 53121da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 53131da177e4SLinus Torvalds * 531479efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 531579efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 5316742120c6SMing Lei * the reset is over (using their post_reset method). 531779efa097SAlan Stern * 5318626f090cSYacine Belkadi * Return: The same as for usb_reset_and_verify_device(). 531979efa097SAlan Stern * 5320626f090cSYacine Belkadi * Note: 532179efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 532279efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 532379efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 5324742120c6SMing Lei * the device using usb_lock_device_for_reset(). 532579efa097SAlan Stern * 532679efa097SAlan Stern * If an interface is currently being probed or disconnected, we assume 532779efa097SAlan Stern * its driver knows how to handle resets. For all other interfaces, 532879efa097SAlan Stern * if the driver doesn't have pre_reset and post_reset methods then 532979efa097SAlan Stern * we attempt to unbind it and rebind afterward. 533079efa097SAlan Stern */ 5331742120c6SMing Lei int usb_reset_device(struct usb_device *udev) 533279efa097SAlan Stern { 533379efa097SAlan Stern int ret; 5334852c4b43SAlan Stern int i; 53354d769defSMing Lei unsigned int noio_flag; 533679efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 533779efa097SAlan Stern 533879efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 533979efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 534079efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 534179efa097SAlan Stern udev->state); 534279efa097SAlan Stern return -EINVAL; 534379efa097SAlan Stern } 534479efa097SAlan Stern 53454d769defSMing Lei /* 53464d769defSMing Lei * Don't allocate memory with GFP_KERNEL in current 53474d769defSMing Lei * context to avoid possible deadlock if usb mass 53484d769defSMing Lei * storage interface or usbnet interface(iSCSI case) 53494d769defSMing Lei * is included in current configuration. The easist 53504d769defSMing Lei * approach is to do it for every device reset, 53514d769defSMing Lei * because the device 'memalloc_noio' flag may have 53524d769defSMing Lei * not been set before reseting the usb device. 53534d769defSMing Lei */ 53544d769defSMing Lei noio_flag = memalloc_noio_save(); 53554d769defSMing Lei 5356645daaabSAlan Stern /* Prevent autosuspend during the reset */ 535794fcda1fSAlan Stern usb_autoresume_device(udev); 5358645daaabSAlan Stern 535979efa097SAlan Stern if (config) { 5360852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 5361852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 536279efa097SAlan Stern struct usb_driver *drv; 536378d9a487SAlan Stern int unbind = 0; 536479efa097SAlan Stern 5365852c4b43SAlan Stern if (cintf->dev.driver) { 536679efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 536778d9a487SAlan Stern if (drv->pre_reset && drv->post_reset) 536878d9a487SAlan Stern unbind = (drv->pre_reset)(cintf); 536978d9a487SAlan Stern else if (cintf->condition == 537078d9a487SAlan Stern USB_INTERFACE_BOUND) 537178d9a487SAlan Stern unbind = 1; 537278d9a487SAlan Stern if (unbind) 537378d9a487SAlan Stern usb_forced_unbind_intf(cintf); 537479efa097SAlan Stern } 537579efa097SAlan Stern } 537679efa097SAlan Stern } 537779efa097SAlan Stern 5378742120c6SMing Lei ret = usb_reset_and_verify_device(udev); 537979efa097SAlan Stern 538079efa097SAlan Stern if (config) { 5381852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 5382852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 538379efa097SAlan Stern struct usb_driver *drv; 538478d9a487SAlan Stern int rebind = cintf->needs_binding; 538579efa097SAlan Stern 538678d9a487SAlan Stern if (!rebind && cintf->dev.driver) { 538779efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 538879efa097SAlan Stern if (drv->post_reset) 538978d9a487SAlan Stern rebind = (drv->post_reset)(cintf); 539078d9a487SAlan Stern else if (cintf->condition == 539178d9a487SAlan Stern USB_INTERFACE_BOUND) 539278d9a487SAlan Stern rebind = 1; 53936aec044cSAlan Stern if (rebind) 53946aec044cSAlan Stern cintf->needs_binding = 1; 539579efa097SAlan Stern } 539679efa097SAlan Stern } 53976aec044cSAlan Stern usb_unbind_and_rebind_marked_interfaces(udev); 539879efa097SAlan Stern } 539979efa097SAlan Stern 540094fcda1fSAlan Stern usb_autosuspend_device(udev); 54014d769defSMing Lei memalloc_noio_restore(noio_flag); 540279efa097SAlan Stern return ret; 540379efa097SAlan Stern } 5404742120c6SMing Lei EXPORT_SYMBOL_GPL(usb_reset_device); 5405dc023dceSInaky Perez-Gonzalez 5406dc023dceSInaky Perez-Gonzalez 5407dc023dceSInaky Perez-Gonzalez /** 5408dc023dceSInaky Perez-Gonzalez * usb_queue_reset_device - Reset a USB device from an atomic context 5409dc023dceSInaky Perez-Gonzalez * @iface: USB interface belonging to the device to reset 5410dc023dceSInaky Perez-Gonzalez * 5411dc023dceSInaky Perez-Gonzalez * This function can be used to reset a USB device from an atomic 5412dc023dceSInaky Perez-Gonzalez * context, where usb_reset_device() won't work (as it blocks). 5413dc023dceSInaky Perez-Gonzalez * 5414dc023dceSInaky Perez-Gonzalez * Doing a reset via this method is functionally equivalent to calling 5415dc023dceSInaky Perez-Gonzalez * usb_reset_device(), except for the fact that it is delayed to a 5416dc023dceSInaky Perez-Gonzalez * workqueue. This means that any drivers bound to other interfaces 5417dc023dceSInaky Perez-Gonzalez * might be unbound, as well as users from usbfs in user space. 5418dc023dceSInaky Perez-Gonzalez * 5419dc023dceSInaky Perez-Gonzalez * Corner cases: 5420dc023dceSInaky Perez-Gonzalez * 5421dc023dceSInaky Perez-Gonzalez * - Scheduling two resets at the same time from two different drivers 5422dc023dceSInaky Perez-Gonzalez * attached to two different interfaces of the same device is 5423dc023dceSInaky Perez-Gonzalez * possible; depending on how the driver attached to each interface 5424dc023dceSInaky Perez-Gonzalez * handles ->pre_reset(), the second reset might happen or not. 5425dc023dceSInaky Perez-Gonzalez * 5426dc023dceSInaky Perez-Gonzalez * - If a driver is unbound and it had a pending reset, the reset will 5427dc023dceSInaky Perez-Gonzalez * be cancelled. 5428dc023dceSInaky Perez-Gonzalez * 5429dc023dceSInaky Perez-Gonzalez * - This function can be called during .probe() or .disconnect() 5430dc023dceSInaky Perez-Gonzalez * times. On return from .disconnect(), any pending resets will be 5431dc023dceSInaky Perez-Gonzalez * cancelled. 5432dc023dceSInaky Perez-Gonzalez * 5433dc023dceSInaky Perez-Gonzalez * There is no no need to lock/unlock the @reset_ws as schedule_work() 5434dc023dceSInaky Perez-Gonzalez * does its own. 5435dc023dceSInaky Perez-Gonzalez * 5436dc023dceSInaky Perez-Gonzalez * NOTE: We don't do any reference count tracking because it is not 5437dc023dceSInaky Perez-Gonzalez * needed. The lifecycle of the work_struct is tied to the 5438dc023dceSInaky Perez-Gonzalez * usb_interface. Before destroying the interface we cancel the 5439dc023dceSInaky Perez-Gonzalez * work_struct, so the fact that work_struct is queued and or 5440dc023dceSInaky Perez-Gonzalez * running means the interface (and thus, the device) exist and 5441dc023dceSInaky Perez-Gonzalez * are referenced. 5442dc023dceSInaky Perez-Gonzalez */ 5443dc023dceSInaky Perez-Gonzalez void usb_queue_reset_device(struct usb_interface *iface) 5444dc023dceSInaky Perez-Gonzalez { 5445dc023dceSInaky Perez-Gonzalez schedule_work(&iface->reset_ws); 5446dc023dceSInaky Perez-Gonzalez } 5447dc023dceSInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_queue_reset_device); 5448ff823c79SLan Tianyu 5449ff823c79SLan Tianyu /** 5450ff823c79SLan Tianyu * usb_hub_find_child - Get the pointer of child device 5451ff823c79SLan Tianyu * attached to the port which is specified by @port1. 5452ff823c79SLan Tianyu * @hdev: USB device belonging to the usb hub 5453ff823c79SLan Tianyu * @port1: port num to indicate which port the child device 5454ff823c79SLan Tianyu * is attached to. 5455ff823c79SLan Tianyu * 5456ff823c79SLan Tianyu * USB drivers call this function to get hub's child device 5457ff823c79SLan Tianyu * pointer. 5458ff823c79SLan Tianyu * 5459626f090cSYacine Belkadi * Return: %NULL if input param is invalid and 5460ff823c79SLan Tianyu * child's usb_device pointer if non-NULL. 5461ff823c79SLan Tianyu */ 5462ff823c79SLan Tianyu struct usb_device *usb_hub_find_child(struct usb_device *hdev, 5463ff823c79SLan Tianyu int port1) 5464ff823c79SLan Tianyu { 5465ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5466ff823c79SLan Tianyu 5467ff823c79SLan Tianyu if (port1 < 1 || port1 > hdev->maxchild) 5468ff823c79SLan Tianyu return NULL; 5469ff823c79SLan Tianyu return hub->ports[port1 - 1]->child; 5470ff823c79SLan Tianyu } 5471ff823c79SLan Tianyu EXPORT_SYMBOL_GPL(usb_hub_find_child); 5472d5575424SLan Tianyu 547305f91689SLan Tianyu /** 547405f91689SLan Tianyu * usb_set_hub_port_connect_type - set hub port connect type. 547505f91689SLan Tianyu * @hdev: USB device belonging to the usb hub 547605f91689SLan Tianyu * @port1: port num of the port 547705f91689SLan Tianyu * @type: connect type of the port 547805f91689SLan Tianyu */ 547905f91689SLan Tianyu void usb_set_hub_port_connect_type(struct usb_device *hdev, int port1, 548005f91689SLan Tianyu enum usb_port_connect_type type) 548105f91689SLan Tianyu { 5482ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 548305f91689SLan Tianyu 548441341261SMathias Nyman if (hub) 548505f91689SLan Tianyu hub->ports[port1 - 1]->connect_type = type; 548605f91689SLan Tianyu } 548705f91689SLan Tianyu 548805f91689SLan Tianyu /** 548905f91689SLan Tianyu * usb_get_hub_port_connect_type - Get the port's connect type 549005f91689SLan Tianyu * @hdev: USB device belonging to the usb hub 549105f91689SLan Tianyu * @port1: port num of the port 549205f91689SLan Tianyu * 5493626f090cSYacine Belkadi * Return: The connect type of the port if successful. Or 5494626f090cSYacine Belkadi * USB_PORT_CONNECT_TYPE_UNKNOWN if input params are invalid. 549505f91689SLan Tianyu */ 549605f91689SLan Tianyu enum usb_port_connect_type 549705f91689SLan Tianyu usb_get_hub_port_connect_type(struct usb_device *hdev, int port1) 549805f91689SLan Tianyu { 5499ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 550005f91689SLan Tianyu 550141341261SMathias Nyman if (!hub) 550241341261SMathias Nyman return USB_PORT_CONNECT_TYPE_UNKNOWN; 550341341261SMathias Nyman 550405f91689SLan Tianyu return hub->ports[port1 - 1]->connect_type; 550505f91689SLan Tianyu } 550605f91689SLan Tianyu 5507d2123fd9SLan Tianyu void usb_hub_adjust_deviceremovable(struct usb_device *hdev, 5508d2123fd9SLan Tianyu struct usb_hub_descriptor *desc) 5509d2123fd9SLan Tianyu { 5510d2123fd9SLan Tianyu enum usb_port_connect_type connect_type; 5511d2123fd9SLan Tianyu int i; 5512d2123fd9SLan Tianyu 5513d2123fd9SLan Tianyu if (!hub_is_superspeed(hdev)) { 5514d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 5515d2123fd9SLan Tianyu connect_type = usb_get_hub_port_connect_type(hdev, i); 5516d2123fd9SLan Tianyu 5517d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 5518d2123fd9SLan Tianyu u8 mask = 1 << (i%8); 5519d2123fd9SLan Tianyu 5520d2123fd9SLan Tianyu if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { 5521d2123fd9SLan Tianyu dev_dbg(&hdev->dev, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n", 5522d2123fd9SLan Tianyu i); 5523d2123fd9SLan Tianyu desc->u.hs.DeviceRemovable[i/8] |= mask; 5524d2123fd9SLan Tianyu } 5525d2123fd9SLan Tianyu } 5526d2123fd9SLan Tianyu } 5527d2123fd9SLan Tianyu } else { 5528d2123fd9SLan Tianyu u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); 5529d2123fd9SLan Tianyu 5530d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 5531d2123fd9SLan Tianyu connect_type = usb_get_hub_port_connect_type(hdev, i); 5532d2123fd9SLan Tianyu 5533d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 5534d2123fd9SLan Tianyu u16 mask = 1 << i; 5535d2123fd9SLan Tianyu 5536d2123fd9SLan Tianyu if (!(port_removable & mask)) { 5537d2123fd9SLan Tianyu dev_dbg(&hdev->dev, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n", 5538d2123fd9SLan Tianyu i); 5539d2123fd9SLan Tianyu port_removable |= mask; 5540d2123fd9SLan Tianyu } 5541d2123fd9SLan Tianyu } 5542d2123fd9SLan Tianyu } 5543d2123fd9SLan Tianyu 5544d2123fd9SLan Tianyu desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); 5545d2123fd9SLan Tianyu } 5546d2123fd9SLan Tianyu } 5547d2123fd9SLan Tianyu 5548d5575424SLan Tianyu #ifdef CONFIG_ACPI 5549d5575424SLan Tianyu /** 5550d5575424SLan Tianyu * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle 5551d5575424SLan Tianyu * @hdev: USB device belonging to the usb hub 5552d5575424SLan Tianyu * @port1: port num of the port 5553d5575424SLan Tianyu * 5554626f090cSYacine Belkadi * Return: Port's acpi handle if successful, %NULL if params are 5555626f090cSYacine Belkadi * invalid. 5556d5575424SLan Tianyu */ 5557d5575424SLan Tianyu acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, 5558d5575424SLan Tianyu int port1) 5559d5575424SLan Tianyu { 5560ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5561d5575424SLan Tianyu 556241341261SMathias Nyman if (!hub) 556341341261SMathias Nyman return NULL; 556441341261SMathias Nyman 55653a83f992SRafael J. Wysocki return ACPI_HANDLE(&hub->ports[port1 - 1]->dev); 5566d5575424SLan Tianyu } 5567d5575424SLan Tianyu #endif 5568