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/smp_lock.h> 201da177e4SLinus Torvalds #include <linux/ioctl.h> 211da177e4SLinus Torvalds #include <linux/usb.h> 221da177e4SLinus Torvalds #include <linux/usbdevice_fs.h> 239c8d6178Sakpm@osdl.org #include <linux/kthread.h> 244186ecf8SArjan van de Ven #include <linux/mutex.h> 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #include <asm/semaphore.h> 271da177e4SLinus Torvalds #include <asm/uaccess.h> 281da177e4SLinus Torvalds #include <asm/byteorder.h> 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds #include "usb.h" 311da177e4SLinus Torvalds #include "hcd.h" 321da177e4SLinus Torvalds #include "hub.h" 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds /* Protect struct usb_device->state and ->children members 359ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 361da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 371da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds /* khubd's worklist and its lock */ 401da177e4SLinus Torvalds static DEFINE_SPINLOCK(hub_event_lock); 411da177e4SLinus Torvalds static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds /* Wakes up khubd */ 441da177e4SLinus Torvalds static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); 451da177e4SLinus Torvalds 469c8d6178Sakpm@osdl.org static struct task_struct *khubd_task; 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 491da177e4SLinus Torvalds static int blinkenlights = 0; 501da177e4SLinus Torvalds module_param (blinkenlights, bool, S_IRUGO); 511da177e4SLinus Torvalds MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds /* 541da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 551da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 561da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 571da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 581da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 591da177e4SLinus Torvalds * following module parameters. 601da177e4SLinus Torvalds * 611da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 621da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 631da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 641da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 651da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 661da177e4SLinus Torvalds */ 671da177e4SLinus Torvalds static int old_scheme_first = 0; 681da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 691da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 701da177e4SLinus Torvalds "start with the old device initialization scheme"); 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds static int use_both_schemes = 1; 731da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 741da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 751da177e4SLinus Torvalds "try the other device initialization scheme if the " 761da177e4SLinus Torvalds "first one fails"); 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds #ifdef DEBUG 801da177e4SLinus Torvalds static inline char *portspeed (int portstatus) 811da177e4SLinus Torvalds { 821da177e4SLinus Torvalds if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) 831da177e4SLinus Torvalds return "480 Mb/s"; 841da177e4SLinus Torvalds else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) 851da177e4SLinus Torvalds return "1.5 Mb/s"; 861da177e4SLinus Torvalds else 871da177e4SLinus Torvalds return "12 Mb/s"; 881da177e4SLinus Torvalds } 891da177e4SLinus Torvalds #endif 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 921da177e4SLinus Torvalds static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev) 931da177e4SLinus Torvalds { 941da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 951da177e4SLinus Torvalds } 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 981da177e4SLinus Torvalds static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) 991da177e4SLinus Torvalds { 1001da177e4SLinus Torvalds int i, ret; 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 1031da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 1041da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 1051da177e4SLinus Torvalds USB_DT_HUB << 8, 0, data, size, 1061da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 1071da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 1081da177e4SLinus Torvalds return ret; 1091da177e4SLinus Torvalds } 1101da177e4SLinus Torvalds return -EINVAL; 1111da177e4SLinus Torvalds } 1121da177e4SLinus Torvalds 1131da177e4SLinus Torvalds /* 1141da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 1151da177e4SLinus Torvalds */ 1161da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 1171da177e4SLinus Torvalds { 1181da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1191da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 1201da177e4SLinus Torvalds } 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds /* 1231da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 1241da177e4SLinus Torvalds */ 1251da177e4SLinus Torvalds static int clear_port_feature(struct usb_device *hdev, int port1, int feature) 1261da177e4SLinus Torvalds { 1271da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1281da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 1291da177e4SLinus Torvalds NULL, 0, 1000); 1301da177e4SLinus Torvalds } 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds /* 1331da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 1341da177e4SLinus Torvalds */ 1351da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 1361da177e4SLinus Torvalds { 1371da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1381da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 1391da177e4SLinus Torvalds NULL, 0, 1000); 1401da177e4SLinus Torvalds } 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds /* 1431da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 1441da177e4SLinus Torvalds * for info about using port indicators 1451da177e4SLinus Torvalds */ 1461da177e4SLinus Torvalds static void set_port_led( 1471da177e4SLinus Torvalds struct usb_hub *hub, 1481da177e4SLinus Torvalds int port1, 1491da177e4SLinus Torvalds int selector 1501da177e4SLinus Torvalds ) 1511da177e4SLinus Torvalds { 1521da177e4SLinus Torvalds int status = set_port_feature(hub->hdev, (selector << 8) | port1, 1531da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 1541da177e4SLinus Torvalds if (status < 0) 1551da177e4SLinus Torvalds dev_dbg (hub->intfdev, 1561da177e4SLinus Torvalds "port %d indicator %s status %d\n", 1571da177e4SLinus Torvalds port1, 1581da177e4SLinus Torvalds ({ char *s; switch (selector) { 1591da177e4SLinus Torvalds case HUB_LED_AMBER: s = "amber"; break; 1601da177e4SLinus Torvalds case HUB_LED_GREEN: s = "green"; break; 1611da177e4SLinus Torvalds case HUB_LED_OFF: s = "off"; break; 1621da177e4SLinus Torvalds case HUB_LED_AUTO: s = "auto"; break; 1631da177e4SLinus Torvalds default: s = "??"; break; 1641da177e4SLinus Torvalds }; s; }), 1651da177e4SLinus Torvalds status); 1661da177e4SLinus Torvalds } 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds static void led_work (void *__hub) 1711da177e4SLinus Torvalds { 1721da177e4SLinus Torvalds struct usb_hub *hub = __hub; 1731da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 1741da177e4SLinus Torvalds unsigned i; 1751da177e4SLinus Torvalds unsigned changed = 0; 1761da177e4SLinus Torvalds int cursor = -1; 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 1791da177e4SLinus Torvalds return; 1801da177e4SLinus Torvalds 1811da177e4SLinus Torvalds for (i = 0; i < hub->descriptor->bNbrPorts; i++) { 1821da177e4SLinus Torvalds unsigned selector, mode; 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds /* 30%-50% duty cycle */ 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds switch (hub->indicator[i]) { 1871da177e4SLinus Torvalds /* cycle marker */ 1881da177e4SLinus Torvalds case INDICATOR_CYCLE: 1891da177e4SLinus Torvalds cursor = i; 1901da177e4SLinus Torvalds selector = HUB_LED_AUTO; 1911da177e4SLinus Torvalds mode = INDICATOR_AUTO; 1921da177e4SLinus Torvalds break; 1931da177e4SLinus Torvalds /* blinking green = sw attention */ 1941da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 1951da177e4SLinus Torvalds selector = HUB_LED_GREEN; 1961da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 1971da177e4SLinus Torvalds break; 1981da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 1991da177e4SLinus Torvalds selector = HUB_LED_OFF; 2001da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 2011da177e4SLinus Torvalds break; 2021da177e4SLinus Torvalds /* blinking amber = hw attention */ 2031da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 2041da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2051da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 2061da177e4SLinus Torvalds break; 2071da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 2081da177e4SLinus Torvalds selector = HUB_LED_OFF; 2091da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 2101da177e4SLinus Torvalds break; 2111da177e4SLinus Torvalds /* blink green/amber = reserved */ 2121da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 2131da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2141da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 2151da177e4SLinus Torvalds break; 2161da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 2171da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2181da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 2191da177e4SLinus Torvalds break; 2201da177e4SLinus Torvalds default: 2211da177e4SLinus Torvalds continue; 2221da177e4SLinus Torvalds } 2231da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 2241da177e4SLinus Torvalds changed = 1; 2251da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 2261da177e4SLinus Torvalds hub->indicator[i] = mode; 2271da177e4SLinus Torvalds } 2281da177e4SLinus Torvalds if (!changed && blinkenlights) { 2291da177e4SLinus Torvalds cursor++; 2301da177e4SLinus Torvalds cursor %= hub->descriptor->bNbrPorts; 2311da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 2321da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 2331da177e4SLinus Torvalds changed++; 2341da177e4SLinus Torvalds } 2351da177e4SLinus Torvalds if (changed) 2361da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 2371da177e4SLinus Torvalds } 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 2401da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 2411da177e4SLinus Torvalds #define USB_STS_RETRIES 5 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds /* 2441da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 2451da177e4SLinus Torvalds */ 2461da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 2471da177e4SLinus Torvalds struct usb_hub_status *data) 2481da177e4SLinus Torvalds { 2491da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 2521da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 2531da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 2541da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 2551da177e4SLinus Torvalds } 2561da177e4SLinus Torvalds return status; 2571da177e4SLinus Torvalds } 2581da177e4SLinus Torvalds 2591da177e4SLinus Torvalds /* 2601da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 2611da177e4SLinus Torvalds */ 2621da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 2631da177e4SLinus Torvalds struct usb_port_status *data) 2641da177e4SLinus Torvalds { 2651da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 2681da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 2691da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 2701da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 2711da177e4SLinus Torvalds } 2721da177e4SLinus Torvalds return status; 2731da177e4SLinus Torvalds } 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds static void kick_khubd(struct usb_hub *hub) 2761da177e4SLinus Torvalds { 2771da177e4SLinus Torvalds unsigned long flags; 2781da177e4SLinus Torvalds 2791da177e4SLinus Torvalds spin_lock_irqsave(&hub_event_lock, flags); 2801da177e4SLinus Torvalds if (list_empty(&hub->event_list)) { 2811da177e4SLinus Torvalds list_add_tail(&hub->event_list, &hub_event_list); 2821da177e4SLinus Torvalds wake_up(&khubd_wait); 2831da177e4SLinus Torvalds } 2841da177e4SLinus Torvalds spin_unlock_irqrestore(&hub_event_lock, flags); 2851da177e4SLinus Torvalds } 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds void usb_kick_khubd(struct usb_device *hdev) 2881da177e4SLinus Torvalds { 2891da177e4SLinus Torvalds kick_khubd(hdev_to_hub(hdev)); 2901da177e4SLinus Torvalds } 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 2941da177e4SLinus Torvalds static void hub_irq(struct urb *urb, struct pt_regs *regs) 2951da177e4SLinus Torvalds { 2961da177e4SLinus Torvalds struct usb_hub *hub = (struct usb_hub *)urb->context; 2971da177e4SLinus Torvalds int status; 2981da177e4SLinus Torvalds int i; 2991da177e4SLinus Torvalds unsigned long bits; 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds switch (urb->status) { 3021da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 3031da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 3041da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 3051da177e4SLinus Torvalds return; 3061da177e4SLinus Torvalds 3071da177e4SLinus Torvalds default: /* presumably an error */ 3081da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 3091da177e4SLinus Torvalds dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status); 3101da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 3111da177e4SLinus Torvalds goto resubmit; 3121da177e4SLinus Torvalds hub->error = urb->status; 3131da177e4SLinus Torvalds /* FALL THROUGH */ 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds /* let khubd handle things */ 3161da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 3171da177e4SLinus Torvalds bits = 0; 3181da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 3191da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 3201da177e4SLinus Torvalds << (i*8); 3211da177e4SLinus Torvalds hub->event_bits[0] = bits; 3221da177e4SLinus Torvalds break; 3231da177e4SLinus Torvalds } 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvalds hub->nerrors = 0; 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds /* Something happened, let khubd figure it out */ 3281da177e4SLinus Torvalds kick_khubd(hub); 3291da177e4SLinus Torvalds 3301da177e4SLinus Torvalds resubmit: 3311da177e4SLinus Torvalds if (hub->quiescing) 3321da177e4SLinus Torvalds return; 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvalds if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 3351da177e4SLinus Torvalds && status != -ENODEV && status != -EPERM) 3361da177e4SLinus Torvalds dev_err (hub->intfdev, "resubmit --> %d\n", status); 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 3401da177e4SLinus Torvalds static inline int 3411da177e4SLinus Torvalds hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) 3421da177e4SLinus Torvalds { 3431da177e4SLinus Torvalds return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3441da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 3451da177e4SLinus Torvalds tt, NULL, 0, 1000); 3461da177e4SLinus Torvalds } 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds /* 3491da177e4SLinus Torvalds * enumeration blocks khubd for a long time. we use keventd instead, since 3501da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 3511da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 3521da177e4SLinus Torvalds * both can talk to the same hub concurrently. 3531da177e4SLinus Torvalds */ 3541da177e4SLinus Torvalds static void hub_tt_kevent (void *arg) 3551da177e4SLinus Torvalds { 3561da177e4SLinus Torvalds struct usb_hub *hub = arg; 3571da177e4SLinus Torvalds unsigned long flags; 3581da177e4SLinus Torvalds 3591da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 3601da177e4SLinus Torvalds while (!list_empty (&hub->tt.clear_list)) { 3611da177e4SLinus Torvalds struct list_head *temp; 3621da177e4SLinus Torvalds struct usb_tt_clear *clear; 3631da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 3641da177e4SLinus Torvalds int status; 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds temp = hub->tt.clear_list.next; 3671da177e4SLinus Torvalds clear = list_entry (temp, struct usb_tt_clear, clear_list); 3681da177e4SLinus Torvalds list_del (&clear->clear_list); 3691da177e4SLinus Torvalds 3701da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 3711da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 3721da177e4SLinus Torvalds status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 3731da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 3741da177e4SLinus Torvalds 3751da177e4SLinus Torvalds if (status) 3761da177e4SLinus Torvalds dev_err (&hdev->dev, 3771da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 3781da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 3791da177e4SLinus Torvalds kfree(clear); 3801da177e4SLinus Torvalds } 3811da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds 3841da177e4SLinus Torvalds /** 3851da177e4SLinus Torvalds * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub 3861da177e4SLinus Torvalds * @udev: the device whose split transaction failed 3871da177e4SLinus Torvalds * @pipe: identifies the endpoint of the failed transaction 3881da177e4SLinus Torvalds * 3891da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 3901da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 3911da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 3921da177e4SLinus Torvalds * interrupt context. 3931da177e4SLinus Torvalds * 3941da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 3951da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 3961da177e4SLinus Torvalds */ 3971da177e4SLinus Torvalds void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe) 3981da177e4SLinus Torvalds { 3991da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 4001da177e4SLinus Torvalds unsigned long flags; 4011da177e4SLinus Torvalds struct usb_tt_clear *clear; 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 4041da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 4051da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 4061da177e4SLinus Torvalds */ 4071da177e4SLinus Torvalds if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == NULL) { 4081da177e4SLinus Torvalds dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 4091da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 4101da177e4SLinus Torvalds return; 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 4141da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 4151da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 4161da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 4171da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol (pipe) 4181da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 4191da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 4201da177e4SLinus Torvalds if (usb_pipein (pipe)) 4211da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 4241da177e4SLinus Torvalds spin_lock_irqsave (&tt->lock, flags); 4251da177e4SLinus Torvalds list_add_tail (&clear->clear_list, &tt->clear_list); 4261da177e4SLinus Torvalds schedule_work (&tt->kevent); 4271da177e4SLinus Torvalds spin_unlock_irqrestore (&tt->lock, flags); 4281da177e4SLinus Torvalds } 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds static void hub_power_on(struct usb_hub *hub) 4311da177e4SLinus Torvalds { 4321da177e4SLinus Torvalds int port1; 433b789696aSDavid Brownell unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 4344489a571SAlan Stern u16 wHubCharacteristics = 4354489a571SAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 4361da177e4SLinus Torvalds 4374489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 4384489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 4394489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 4404489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 4414489a571SAlan Stern * unless we send these messages to the hub. 4424489a571SAlan Stern */ 4434489a571SAlan Stern if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) 4441da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 4454489a571SAlan Stern else 4464489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 4474489a571SAlan Stern "non-switchable hub\n"); 4481da177e4SLinus Torvalds for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) 4494489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 4501da177e4SLinus Torvalds 451b789696aSDavid Brownell /* Wait at least 100 msec for power to become stable */ 452b789696aSDavid Brownell msleep(max(pgood_delay, (unsigned) 100)); 4531da177e4SLinus Torvalds } 4541da177e4SLinus Torvalds 45502c399eeSAlan Stern static void hub_quiesce(struct usb_hub *hub) 4561da177e4SLinus Torvalds { 457979d5199SDavid Brownell /* (nonblocking) khubd and related activity won't re-trigger */ 4581da177e4SLinus Torvalds hub->quiescing = 1; 459c9f89fa4SDavid Brownell hub->activating = 0; 460979d5199SDavid Brownell hub->resume_root_hub = 0; 461979d5199SDavid Brownell 462979d5199SDavid Brownell /* (blocking) stop khubd and related activity */ 4631da177e4SLinus Torvalds usb_kill_urb(hub->urb); 4641da177e4SLinus Torvalds if (hub->has_indicators) 4651da177e4SLinus Torvalds cancel_delayed_work(&hub->leds); 4661da177e4SLinus Torvalds if (hub->has_indicators || hub->tt.hub) 4671da177e4SLinus Torvalds flush_scheduled_work(); 4681da177e4SLinus Torvalds } 4691da177e4SLinus Torvalds 4701da177e4SLinus Torvalds static void hub_activate(struct usb_hub *hub) 4711da177e4SLinus Torvalds { 4721da177e4SLinus Torvalds int status; 4731da177e4SLinus Torvalds 4741da177e4SLinus Torvalds hub->quiescing = 0; 4751da177e4SLinus Torvalds hub->activating = 1; 476979d5199SDavid Brownell hub->resume_root_hub = 0; 4771da177e4SLinus Torvalds status = usb_submit_urb(hub->urb, GFP_NOIO); 4781da177e4SLinus Torvalds if (status < 0) 4791da177e4SLinus Torvalds dev_err(hub->intfdev, "activate --> %d\n", status); 4801da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 4811da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds /* scan all ports ASAP */ 4841da177e4SLinus Torvalds kick_khubd(hub); 4851da177e4SLinus Torvalds } 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 4881da177e4SLinus Torvalds u16 *status, u16 *change) 4891da177e4SLinus Torvalds { 4901da177e4SLinus Torvalds int ret; 4911da177e4SLinus Torvalds 4921da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 4931da177e4SLinus Torvalds if (ret < 0) 4941da177e4SLinus Torvalds dev_err (hub->intfdev, 4951da177e4SLinus Torvalds "%s failed (err = %d)\n", __FUNCTION__, ret); 4961da177e4SLinus Torvalds else { 4971da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 4981da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 4991da177e4SLinus Torvalds ret = 0; 5001da177e4SLinus Torvalds } 5011da177e4SLinus Torvalds return ret; 5021da177e4SLinus Torvalds } 5031da177e4SLinus Torvalds 5048b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 5058b28c752SAlan Stern { 5068b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 5078b28c752SAlan Stern int ret; 5088b28c752SAlan Stern 5098b28c752SAlan Stern if (hdev->children[port1-1] && set_state) { 5108b28c752SAlan Stern usb_set_device_state(hdev->children[port1-1], 5118b28c752SAlan Stern USB_STATE_NOTATTACHED); 5128b28c752SAlan Stern } 5138b28c752SAlan Stern ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); 5148b28c752SAlan Stern if (ret) 5158b28c752SAlan Stern dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 5168b28c752SAlan Stern port1, ret); 5178b28c752SAlan Stern 5188b28c752SAlan Stern return ret; 5198b28c752SAlan Stern } 5208b28c752SAlan Stern 5217d069b7dSAlan Stern 5227d069b7dSAlan Stern /* caller has locked the hub device */ 5237de18d8bSAlan Stern static void hub_pre_reset(struct usb_interface *intf) 5247d069b7dSAlan Stern { 5257de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 5267d069b7dSAlan Stern struct usb_device *hdev = hub->hdev; 5277d069b7dSAlan Stern int port1; 5287d069b7dSAlan Stern 5297d069b7dSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 5307d069b7dSAlan Stern if (hdev->children[port1 - 1]) { 5317d069b7dSAlan Stern usb_disconnect(&hdev->children[port1 - 1]); 5327de18d8bSAlan Stern if (hub->error == 0) 5337d069b7dSAlan Stern hub_port_disable(hub, port1, 0); 5347d069b7dSAlan Stern } 5357d069b7dSAlan Stern } 5367d069b7dSAlan Stern hub_quiesce(hub); 5377d069b7dSAlan Stern } 5387d069b7dSAlan Stern 5397d069b7dSAlan Stern /* caller has locked the hub device */ 5407de18d8bSAlan Stern static void hub_post_reset(struct usb_interface *intf) 5417d069b7dSAlan Stern { 5427de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 5437de18d8bSAlan Stern 5447d069b7dSAlan Stern hub_activate(hub); 5457d069b7dSAlan Stern hub_power_on(hub); 5467d069b7dSAlan Stern } 5477d069b7dSAlan Stern 5487d069b7dSAlan Stern 5491da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 5501da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 5511da177e4SLinus Torvalds { 5521da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 5531da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 5541da177e4SLinus Torvalds u16 hubstatus, hubchange; 55574ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 5561da177e4SLinus Torvalds unsigned int pipe; 5571da177e4SLinus Torvalds int maxp, ret; 5581da177e4SLinus Torvalds char *message; 5591da177e4SLinus Torvalds 5601da177e4SLinus Torvalds hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL, 5611da177e4SLinus Torvalds &hub->buffer_dma); 5621da177e4SLinus Torvalds if (!hub->buffer) { 5631da177e4SLinus Torvalds message = "can't allocate hub irq buffer"; 5641da177e4SLinus Torvalds ret = -ENOMEM; 5651da177e4SLinus Torvalds goto fail; 5661da177e4SLinus Torvalds } 5671da177e4SLinus Torvalds 5681da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 5691da177e4SLinus Torvalds if (!hub->status) { 5701da177e4SLinus Torvalds message = "can't kmalloc hub status buffer"; 5711da177e4SLinus Torvalds ret = -ENOMEM; 5721da177e4SLinus Torvalds goto fail; 5731da177e4SLinus Torvalds } 5741da177e4SLinus Torvalds 5751da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 5761da177e4SLinus Torvalds if (!hub->descriptor) { 5771da177e4SLinus Torvalds message = "can't kmalloc hub descriptor"; 5781da177e4SLinus Torvalds ret = -ENOMEM; 5791da177e4SLinus Torvalds goto fail; 5801da177e4SLinus Torvalds } 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds /* Request the entire hub descriptor. 5831da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 5841da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 5851da177e4SLinus Torvalds */ 5861da177e4SLinus Torvalds ret = get_hub_descriptor(hdev, hub->descriptor, 5871da177e4SLinus Torvalds sizeof(*hub->descriptor)); 5881da177e4SLinus Torvalds if (ret < 0) { 5891da177e4SLinus Torvalds message = "can't read hub descriptor"; 5901da177e4SLinus Torvalds goto fail; 5911da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 5921da177e4SLinus Torvalds message = "hub has too many ports!"; 5931da177e4SLinus Torvalds ret = -ENODEV; 5941da177e4SLinus Torvalds goto fail; 5951da177e4SLinus Torvalds } 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 5981da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 5991da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 6001da177e4SLinus Torvalds 60174ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 6021da177e4SLinus Torvalds 60374ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_COMPOUND) { 6041da177e4SLinus Torvalds int i; 6051da177e4SLinus Torvalds char portstr [USB_MAXCHILDREN + 1]; 6061da177e4SLinus Torvalds 6071da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 6081da177e4SLinus Torvalds portstr[i] = hub->descriptor->DeviceRemovable 6091da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 6101da177e4SLinus Torvalds ? 'F' : 'R'; 6111da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 6121da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 6131da177e4SLinus Torvalds } else 6141da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 6151da177e4SLinus Torvalds 61674ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 6171da177e4SLinus Torvalds case 0x00: 6181da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 6191da177e4SLinus Torvalds break; 6201da177e4SLinus Torvalds case 0x01: 6211da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 6221da177e4SLinus Torvalds break; 6231da177e4SLinus Torvalds case 0x02: 6241da177e4SLinus Torvalds case 0x03: 6251da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 6261da177e4SLinus Torvalds break; 6271da177e4SLinus Torvalds } 6281da177e4SLinus Torvalds 62974ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 6301da177e4SLinus Torvalds case 0x00: 6311da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 6321da177e4SLinus Torvalds break; 6331da177e4SLinus Torvalds case 0x08: 6341da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 6351da177e4SLinus Torvalds break; 6361da177e4SLinus Torvalds case 0x10: 6371da177e4SLinus Torvalds case 0x18: 6381da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 6391da177e4SLinus Torvalds break; 6401da177e4SLinus Torvalds } 6411da177e4SLinus Torvalds 6421da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 6431da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 6441da177e4SLinus Torvalds INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub); 6451da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 6461da177e4SLinus Torvalds case 0: 6471da177e4SLinus Torvalds break; 6481da177e4SLinus Torvalds case 1: 6491da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 6501da177e4SLinus Torvalds hub->tt.hub = hdev; 6511da177e4SLinus Torvalds break; 6521da177e4SLinus Torvalds case 2: 6531da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 6541da177e4SLinus Torvalds if (ret == 0) { 6551da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 6561da177e4SLinus Torvalds hub->tt.multi = 1; 6571da177e4SLinus Torvalds } else 6581da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 6591da177e4SLinus Torvalds ret); 6601da177e4SLinus Torvalds hub->tt.hub = hdev; 6611da177e4SLinus Torvalds break; 6621da177e4SLinus Torvalds default: 6631da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 6641da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 6651da177e4SLinus Torvalds break; 6661da177e4SLinus Torvalds } 6671da177e4SLinus Torvalds 668e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 66974ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 670e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 671e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 672e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 673e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 674e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 675e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 676e09711aeSdavid-b@pacbell.net } 6771da177e4SLinus Torvalds break; 678e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 679e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 680e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 681e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 682e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 6831da177e4SLinus Torvalds break; 684e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 685e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 686e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 687e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 688e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 6891da177e4SLinus Torvalds break; 690e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 691e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 692e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 693e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 694e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 6951da177e4SLinus Torvalds break; 6961da177e4SLinus Torvalds } 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 69974ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 7001da177e4SLinus Torvalds hub->has_indicators = 1; 7011da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 7021da177e4SLinus Torvalds } 7031da177e4SLinus Torvalds 7041da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 7051da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 7061da177e4SLinus Torvalds 7071da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 7081da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 7091da177e4SLinus Torvalds */ 7101da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 71155c52718SAlan Stern if (ret < 2) { 7121da177e4SLinus Torvalds message = "can't get hub status"; 7131da177e4SLinus Torvalds goto fail; 7141da177e4SLinus Torvalds } 7157d35b929SAlan Stern le16_to_cpus(&hubstatus); 7167d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 71755c52718SAlan Stern if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) 71855c52718SAlan Stern hub->mA_per_port = 500; 71955c52718SAlan Stern else { 72055c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 72155c52718SAlan Stern hub->limited_power = 1; 72255c52718SAlan Stern } 7237d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 7241da177e4SLinus Torvalds dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 7251da177e4SLinus Torvalds hub->descriptor->bHubContrCurrent); 72655c52718SAlan Stern hub->limited_power = 1; 72755c52718SAlan Stern if (hdev->maxchild > 0) { 72855c52718SAlan Stern int remaining = hdev->bus_mA - 72955c52718SAlan Stern hub->descriptor->bHubContrCurrent; 7301da177e4SLinus Torvalds 73155c52718SAlan Stern if (remaining < hdev->maxchild * 100) 73255c52718SAlan Stern dev_warn(hub_dev, 73355c52718SAlan Stern "insufficient power available " 73455c52718SAlan Stern "to use all downstream ports\n"); 73555c52718SAlan Stern hub->mA_per_port = 100; /* 7.2.1.1 */ 73655c52718SAlan Stern } 73755c52718SAlan Stern } else { /* Self-powered external hub */ 73855c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 73955c52718SAlan Stern * provide less current per port? */ 74055c52718SAlan Stern hub->mA_per_port = 500; 74155c52718SAlan Stern } 74255c52718SAlan Stern if (hub->mA_per_port < 500) 74355c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 74455c52718SAlan Stern hub->mA_per_port); 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 7471da177e4SLinus Torvalds if (ret < 0) { 7481da177e4SLinus Torvalds message = "can't get hub status"; 7491da177e4SLinus Torvalds goto fail; 7501da177e4SLinus Torvalds } 7511da177e4SLinus Torvalds 7521da177e4SLinus Torvalds /* local power status reports aren't always correct */ 7531da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 7541da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 7551da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 7561da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 7571da177e4SLinus Torvalds 75874ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 7591da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 7601da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds /* set up the interrupt endpoint */ 7631da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 7641da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 7651da177e4SLinus Torvalds 7661da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 7671da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 7681da177e4SLinus Torvalds 7691da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 7701da177e4SLinus Torvalds if (!hub->urb) { 7711da177e4SLinus Torvalds message = "couldn't allocate interrupt urb"; 7721da177e4SLinus Torvalds ret = -ENOMEM; 7731da177e4SLinus Torvalds goto fail; 7741da177e4SLinus Torvalds } 7751da177e4SLinus Torvalds 7761da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 7771da177e4SLinus Torvalds hub, endpoint->bInterval); 7781da177e4SLinus Torvalds hub->urb->transfer_dma = hub->buffer_dma; 7791da177e4SLinus Torvalds hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 7801da177e4SLinus Torvalds 7811da177e4SLinus Torvalds /* maybe cycle the hub leds */ 7821da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 7831da177e4SLinus Torvalds hub->indicator [0] = INDICATOR_CYCLE; 7841da177e4SLinus Torvalds 7851da177e4SLinus Torvalds hub_power_on(hub); 7861da177e4SLinus Torvalds hub_activate(hub); 7871da177e4SLinus Torvalds return 0; 7881da177e4SLinus Torvalds 7891da177e4SLinus Torvalds fail: 7901da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 7911da177e4SLinus Torvalds message, ret); 7921da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 7931da177e4SLinus Torvalds return ret; 7941da177e4SLinus Torvalds } 7951da177e4SLinus Torvalds 7961da177e4SLinus Torvalds static unsigned highspeed_hubs; 7971da177e4SLinus Torvalds 7981da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 7991da177e4SLinus Torvalds { 8001da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 8011da177e4SLinus Torvalds struct usb_device *hdev; 8021da177e4SLinus Torvalds 8037de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 8047de18d8bSAlan Stern hub->error = 0; 8057de18d8bSAlan Stern hub_pre_reset(intf); 8067de18d8bSAlan Stern 8078b28c752SAlan Stern usb_set_intfdata (intf, NULL); 8081da177e4SLinus Torvalds hdev = hub->hdev; 8091da177e4SLinus Torvalds 8101da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 8111da177e4SLinus Torvalds highspeed_hubs--; 8121da177e4SLinus Torvalds 8131da177e4SLinus Torvalds usb_free_urb(hub->urb); 8141da177e4SLinus Torvalds hub->urb = NULL; 8151da177e4SLinus Torvalds 8161da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 8171da177e4SLinus Torvalds list_del_init(&hub->event_list); 8181da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 8191da177e4SLinus Torvalds 8201da177e4SLinus Torvalds kfree(hub->descriptor); 8211da177e4SLinus Torvalds hub->descriptor = NULL; 8221da177e4SLinus Torvalds 8231da177e4SLinus Torvalds kfree(hub->status); 8241da177e4SLinus Torvalds hub->status = NULL; 8251da177e4SLinus Torvalds 8261da177e4SLinus Torvalds if (hub->buffer) { 8271da177e4SLinus Torvalds usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer, 8281da177e4SLinus Torvalds hub->buffer_dma); 8291da177e4SLinus Torvalds hub->buffer = NULL; 8301da177e4SLinus Torvalds } 8311da177e4SLinus Torvalds 8321da177e4SLinus Torvalds kfree(hub); 8331da177e4SLinus Torvalds } 8341da177e4SLinus Torvalds 8351da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 8361da177e4SLinus Torvalds { 8371da177e4SLinus Torvalds struct usb_host_interface *desc; 8381da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 8391da177e4SLinus Torvalds struct usb_device *hdev; 8401da177e4SLinus Torvalds struct usb_hub *hub; 8411da177e4SLinus Torvalds 8421da177e4SLinus Torvalds desc = intf->cur_altsetting; 8431da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 8441da177e4SLinus Torvalds 84589ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 84689ccbdc9SDavid Brownell if (hdev->parent) { 84789ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 84889ccbdc9SDavid Brownell return -ENODEV; 84989ccbdc9SDavid Brownell } 85089ccbdc9SDavid Brownell #endif 85189ccbdc9SDavid Brownell 8521da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 8531da177e4SLinus Torvalds /* specs is not defined, but it works */ 8541da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 8551da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 8561da177e4SLinus Torvalds descriptor_error: 8571da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 8581da177e4SLinus Torvalds return -EIO; 8591da177e4SLinus Torvalds } 8601da177e4SLinus Torvalds 8611da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 8621da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 8631da177e4SLinus Torvalds goto descriptor_error; 8641da177e4SLinus Torvalds 8651da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 8661da177e4SLinus Torvalds 867fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 868fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 8691da177e4SLinus Torvalds goto descriptor_error; 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds /* We found a hub */ 8721da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 8731da177e4SLinus Torvalds 8740a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 8751da177e4SLinus Torvalds if (!hub) { 8761da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 8771da177e4SLinus Torvalds return -ENOMEM; 8781da177e4SLinus Torvalds } 8791da177e4SLinus Torvalds 8801da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 8811da177e4SLinus Torvalds hub->intfdev = &intf->dev; 8821da177e4SLinus Torvalds hub->hdev = hdev; 8831da177e4SLinus Torvalds INIT_WORK(&hub->leds, led_work, hub); 8841da177e4SLinus Torvalds 8851da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 8861da177e4SLinus Torvalds 8871da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 8881da177e4SLinus Torvalds highspeed_hubs++; 8891da177e4SLinus Torvalds 8901da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 8911da177e4SLinus Torvalds return 0; 8921da177e4SLinus Torvalds 8931da177e4SLinus Torvalds hub_disconnect (intf); 8941da177e4SLinus Torvalds return -ENODEV; 8951da177e4SLinus Torvalds } 8961da177e4SLinus Torvalds 8971da177e4SLinus Torvalds static int 8981da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 8991da177e4SLinus Torvalds { 9001da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 9011da177e4SLinus Torvalds 9021da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 9031da177e4SLinus Torvalds switch (code) { 9041da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 9051da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 9061da177e4SLinus Torvalds int i; 9071da177e4SLinus Torvalds 9081da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 9091da177e4SLinus Torvalds if (hdev->devnum <= 0) 9101da177e4SLinus Torvalds info->nports = 0; 9111da177e4SLinus Torvalds else { 9121da177e4SLinus Torvalds info->nports = hdev->maxchild; 9131da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 9141da177e4SLinus Torvalds if (hdev->children[i] == NULL) 9151da177e4SLinus Torvalds info->port[i] = 0; 9161da177e4SLinus Torvalds else 9171da177e4SLinus Torvalds info->port[i] = 9181da177e4SLinus Torvalds hdev->children[i]->devnum; 9191da177e4SLinus Torvalds } 9201da177e4SLinus Torvalds } 9211da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 9221da177e4SLinus Torvalds 9231da177e4SLinus Torvalds return info->nports + 1; 9241da177e4SLinus Torvalds } 9251da177e4SLinus Torvalds 9261da177e4SLinus Torvalds default: 9271da177e4SLinus Torvalds return -ENOSYS; 9281da177e4SLinus Torvalds } 9291da177e4SLinus Torvalds } 9301da177e4SLinus Torvalds 9311da177e4SLinus Torvalds 9321da177e4SLinus Torvalds /* grab device/port lock, returning index of that port (zero based). 9331da177e4SLinus Torvalds * protects the upstream link used by this device from concurrent 9341da177e4SLinus Torvalds * tree operations like suspend, resume, reset, and disconnect, which 9351da177e4SLinus Torvalds * apply to everything downstream of a given port. 9361da177e4SLinus Torvalds */ 9371da177e4SLinus Torvalds static int locktree(struct usb_device *udev) 9381da177e4SLinus Torvalds { 9391da177e4SLinus Torvalds int t; 9401da177e4SLinus Torvalds struct usb_device *hdev; 9411da177e4SLinus Torvalds 9421da177e4SLinus Torvalds if (!udev) 9431da177e4SLinus Torvalds return -ENODEV; 9441da177e4SLinus Torvalds 9451da177e4SLinus Torvalds /* root hub is always the first lock in the series */ 9461da177e4SLinus Torvalds hdev = udev->parent; 9471da177e4SLinus Torvalds if (!hdev) { 9481da177e4SLinus Torvalds usb_lock_device(udev); 9491da177e4SLinus Torvalds return 0; 9501da177e4SLinus Torvalds } 9511da177e4SLinus Torvalds 9521da177e4SLinus Torvalds /* on the path from root to us, lock everything from 9531da177e4SLinus Torvalds * top down, dropping parent locks when not needed 9541da177e4SLinus Torvalds */ 9551da177e4SLinus Torvalds t = locktree(hdev); 9561da177e4SLinus Torvalds if (t < 0) 9571da177e4SLinus Torvalds return t; 95812c3da34SAlan Stern 9591da177e4SLinus Torvalds /* everything is fail-fast once disconnect 9601da177e4SLinus Torvalds * processing starts 9611da177e4SLinus Torvalds */ 96212c3da34SAlan Stern if (udev->state == USB_STATE_NOTATTACHED) { 96312c3da34SAlan Stern usb_unlock_device(hdev); 96412c3da34SAlan Stern return -ENODEV; 96512c3da34SAlan Stern } 9661da177e4SLinus Torvalds 9671da177e4SLinus Torvalds /* when everyone grabs locks top->bottom, 9681da177e4SLinus Torvalds * non-overlapping work may be concurrent 9691da177e4SLinus Torvalds */ 9709ad3d6ccSAlan Stern usb_lock_device(udev); 9719ad3d6ccSAlan Stern usb_unlock_device(hdev); 97212c3da34SAlan Stern return udev->portnum; 9731da177e4SLinus Torvalds } 9741da177e4SLinus Torvalds 9751da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 9761da177e4SLinus Torvalds { 9771da177e4SLinus Torvalds int i; 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 9801da177e4SLinus Torvalds if (udev->children[i]) 9811da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev->children[i]); 9821da177e4SLinus Torvalds } 9831da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 9841da177e4SLinus Torvalds } 9851da177e4SLinus Torvalds 9861da177e4SLinus Torvalds /** 9871da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 9881da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 9891da177e4SLinus Torvalds * @new_state: new state value to be stored 9901da177e4SLinus Torvalds * 9911da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 9921da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 9931da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 9941da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 9951da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 9961da177e4SLinus Torvalds * all changes to any device's state must be protected by the 9971da177e4SLinus Torvalds * device_state_lock spinlock. 9981da177e4SLinus Torvalds * 9991da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 10001da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 10011da177e4SLinus Torvalds * 10021da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 10031da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 10041da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 10051da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 10061da177e4SLinus Torvalds */ 10071da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 10081da177e4SLinus Torvalds enum usb_device_state new_state) 10091da177e4SLinus Torvalds { 10101da177e4SLinus Torvalds unsigned long flags; 10111da177e4SLinus Torvalds 10121da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 10131da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 10141da177e4SLinus Torvalds ; /* do nothing */ 1015b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1016fb669cc0SDavid Brownell 1017fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1018fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1019fb669cc0SDavid Brownell */ 1020fb669cc0SDavid Brownell if (udev->parent) { 1021645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1022645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1023645daaabSAlan Stern ; /* No change to wakeup settings */ 1024645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 1025b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 1026b94dc6b5SDavid Brownell (udev->actconfig->desc.bmAttributes 1027b94dc6b5SDavid Brownell & USB_CONFIG_ATT_WAKEUP)); 1028645daaabSAlan Stern else 1029b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 0); 1030fb669cc0SDavid Brownell } 1031645daaabSAlan Stern udev->state = new_state; 1032b94dc6b5SDavid Brownell } else 10331da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 10341da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 10351da177e4SLinus Torvalds } 10361da177e4SLinus Torvalds 10371da177e4SLinus Torvalds 10381c50c317SAlan Stern #ifdef CONFIG_PM 10391c50c317SAlan Stern 10401c50c317SAlan Stern /** 10411c50c317SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 10421c50c317SAlan Stern * @rhdev: struct usb_device for the root hub 10431c50c317SAlan Stern * 10441c50c317SAlan Stern * The USB host controller driver calls this function when its root hub 10451c50c317SAlan Stern * is resumed and Vbus power has been interrupted or the controller 10461c50c317SAlan Stern * has been reset. The routine marks all the children of the root hub 10471c50c317SAlan Stern * as NOTATTACHED and marks logical connect-change events on their ports. 10481c50c317SAlan Stern */ 10491c50c317SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 10501c50c317SAlan Stern { 10511c50c317SAlan Stern struct usb_hub *hub; 10521c50c317SAlan Stern int port1; 10531c50c317SAlan Stern unsigned long flags; 10541c50c317SAlan Stern 10551c50c317SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 10561c50c317SAlan Stern spin_lock_irqsave(&device_state_lock, flags); 10571c50c317SAlan Stern hub = hdev_to_hub(rhdev); 10581c50c317SAlan Stern for (port1 = 1; port1 <= rhdev->maxchild; ++port1) { 10591c50c317SAlan Stern if (rhdev->children[port1 - 1]) { 10601c50c317SAlan Stern recursively_mark_NOTATTACHED( 10611c50c317SAlan Stern rhdev->children[port1 - 1]); 10621c50c317SAlan Stern set_bit(port1, hub->change_bits); 10631c50c317SAlan Stern } 10641c50c317SAlan Stern } 10651c50c317SAlan Stern spin_unlock_irqrestore(&device_state_lock, flags); 10661c50c317SAlan Stern } 10671c50c317SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 10681c50c317SAlan Stern 1069d388dab7SAlan Stern #endif /* CONFIG_PM */ 10701c50c317SAlan Stern 10711da177e4SLinus Torvalds static void choose_address(struct usb_device *udev) 10721da177e4SLinus Torvalds { 10731da177e4SLinus Torvalds int devnum; 10741da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 10751da177e4SLinus Torvalds 10761da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 10771da177e4SLinus Torvalds 10781da177e4SLinus Torvalds /* Try to allocate the next devnum beginning at bus->devnum_next. */ 10791da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 10801da177e4SLinus Torvalds bus->devnum_next); 10811da177e4SLinus Torvalds if (devnum >= 128) 10821da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1); 10831da177e4SLinus Torvalds 10841da177e4SLinus Torvalds bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); 10851da177e4SLinus Torvalds 10861da177e4SLinus Torvalds if (devnum < 128) { 10871da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 10881da177e4SLinus Torvalds udev->devnum = devnum; 10891da177e4SLinus Torvalds } 10901da177e4SLinus Torvalds } 10911da177e4SLinus Torvalds 10921da177e4SLinus Torvalds static void release_address(struct usb_device *udev) 10931da177e4SLinus Torvalds { 10941da177e4SLinus Torvalds if (udev->devnum > 0) { 10951da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 10961da177e4SLinus Torvalds udev->devnum = -1; 10971da177e4SLinus Torvalds } 10981da177e4SLinus Torvalds } 10991da177e4SLinus Torvalds 11001da177e4SLinus Torvalds /** 11011da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 11021da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 11031da177e4SLinus Torvalds * Context: !in_interrupt () 11041da177e4SLinus Torvalds * 11051da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 11061da177e4SLinus Torvalds * 11071da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 11081da177e4SLinus Torvalds * If *pdev is a root hub then this routine will acquire the 11091da177e4SLinus Torvalds * usb_bus_list_lock on behalf of the caller. 11101da177e4SLinus Torvalds * 11111da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 11121da177e4SLinus Torvalds * controllers) should ever call this. 11131da177e4SLinus Torvalds * 11141da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 11151da177e4SLinus Torvalds */ 11161da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 11171da177e4SLinus Torvalds { 11181da177e4SLinus Torvalds struct usb_device *udev = *pdev; 11191da177e4SLinus Torvalds int i; 11201da177e4SLinus Torvalds 11211da177e4SLinus Torvalds if (!udev) { 11221da177e4SLinus Torvalds pr_debug ("%s nodev\n", __FUNCTION__); 11231da177e4SLinus Torvalds return; 11241da177e4SLinus Torvalds } 11251da177e4SLinus Torvalds 11261da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 11271da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 11281da177e4SLinus Torvalds * this quiesces everyting except pending urbs. 11291da177e4SLinus Torvalds */ 11301da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 11311da177e4SLinus Torvalds dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); 11321da177e4SLinus Torvalds 11339ad3d6ccSAlan Stern usb_lock_device(udev); 11349ad3d6ccSAlan Stern 11351da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 11361da177e4SLinus Torvalds for (i = 0; i < USB_MAXCHILDREN; i++) { 11371da177e4SLinus Torvalds if (udev->children[i]) 11381da177e4SLinus Torvalds usb_disconnect(&udev->children[i]); 11391da177e4SLinus Torvalds } 11401da177e4SLinus Torvalds 11411da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 11421da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 11431da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 11441da177e4SLinus Torvalds */ 1145782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 11461da177e4SLinus Torvalds usb_disable_device(udev, 0); 11471da177e4SLinus Torvalds 1148782da727SAlan Stern usb_unlock_device(udev); 11493099e75aSGreg Kroah-Hartman 1150782da727SAlan Stern /* Unregister the device. The device driver is responsible 1151782da727SAlan Stern * for removing the device files from usbfs and sysfs and for 1152782da727SAlan Stern * de-configuring the device. 1153782da727SAlan Stern */ 1154782da727SAlan Stern device_del(&udev->dev); 1155782da727SAlan Stern 1156782da727SAlan Stern /* Free the device number and delete the parent's children[] 11571da177e4SLinus Torvalds * (or root_hub) pointer. 11581da177e4SLinus Torvalds */ 11591da177e4SLinus Torvalds release_address(udev); 11601da177e4SLinus Torvalds 11611da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 11621da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 11631da177e4SLinus Torvalds *pdev = NULL; 11641da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 11651da177e4SLinus Torvalds 1166782da727SAlan Stern put_device(&udev->dev); 11671da177e4SLinus Torvalds } 11681da177e4SLinus Torvalds 11691da177e4SLinus Torvalds #ifdef DEBUG 11701da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 11711da177e4SLinus Torvalds { 11721da177e4SLinus Torvalds if (!string) 11731da177e4SLinus Torvalds return; 11741da177e4SLinus Torvalds dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); 11751da177e4SLinus Torvalds } 11761da177e4SLinus Torvalds 11771da177e4SLinus Torvalds #else 11781da177e4SLinus Torvalds static inline void show_string(struct usb_device *udev, char *id, char *string) 11791da177e4SLinus Torvalds {} 11801da177e4SLinus Torvalds #endif 11811da177e4SLinus Torvalds 11821da177e4SLinus Torvalds 11831da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 11841da177e4SLinus Torvalds #include "otg_whitelist.h" 11851da177e4SLinus Torvalds #endif 11861da177e4SLinus Torvalds 11871da177e4SLinus Torvalds /** 11881da177e4SLinus Torvalds * usb_new_device - perform initial device setup (usbcore-internal) 11891da177e4SLinus Torvalds * @udev: newly addressed device (in ADDRESS state) 11901da177e4SLinus Torvalds * 11911da177e4SLinus Torvalds * This is called with devices which have been enumerated, but not yet 11921da177e4SLinus Torvalds * configured. The device descriptor is available, but not descriptors 11939ad3d6ccSAlan Stern * for any device configuration. The caller must have locked either 11949ad3d6ccSAlan Stern * the parent hub (if udev is a normal device) or else the 11951da177e4SLinus Torvalds * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 11961da177e4SLinus Torvalds * udev has already been installed, but udev is not yet visible through 11971da177e4SLinus Torvalds * sysfs or other filesystem code. 11981da177e4SLinus Torvalds * 11991da177e4SLinus Torvalds * Returns 0 for success (device is configured and listed, with its 12001da177e4SLinus Torvalds * interfaces, in sysfs); else a negative errno value. 12011da177e4SLinus Torvalds * 12021da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 12031da177e4SLinus Torvalds * 12049ad3d6ccSAlan Stern * Only the hub driver or root-hub registrar should ever call this. 12051da177e4SLinus Torvalds */ 12061da177e4SLinus Torvalds int usb_new_device(struct usb_device *udev) 12071da177e4SLinus Torvalds { 12081da177e4SLinus Torvalds int err; 12091da177e4SLinus Torvalds 12101da177e4SLinus Torvalds err = usb_get_configuration(udev); 12111da177e4SLinus Torvalds if (err < 0) { 12121da177e4SLinus Torvalds dev_err(&udev->dev, "can't read configurations, error %d\n", 12131da177e4SLinus Torvalds err); 12141da177e4SLinus Torvalds goto fail; 12151da177e4SLinus Torvalds } 12161da177e4SLinus Torvalds 12171da177e4SLinus Torvalds /* read the standard strings and cache them if present */ 12184f62efe6SAlan Stern udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 12194f62efe6SAlan Stern udev->manufacturer = usb_cache_string(udev, 12204f62efe6SAlan Stern udev->descriptor.iManufacturer); 12214f62efe6SAlan Stern udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 12221da177e4SLinus Torvalds 12231da177e4SLinus Torvalds /* Tell the world! */ 12241da177e4SLinus Torvalds dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, " 12251da177e4SLinus Torvalds "SerialNumber=%d\n", 12261da177e4SLinus Torvalds udev->descriptor.iManufacturer, 12271da177e4SLinus Torvalds udev->descriptor.iProduct, 12281da177e4SLinus Torvalds udev->descriptor.iSerialNumber); 12291da177e4SLinus Torvalds show_string(udev, "Product", udev->product); 12301da177e4SLinus Torvalds show_string(udev, "Manufacturer", udev->manufacturer); 12311da177e4SLinus Torvalds show_string(udev, "SerialNumber", udev->serial); 12321da177e4SLinus Torvalds 12331da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 12341da177e4SLinus Torvalds /* 12351da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 12361da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 12371da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 12381da177e4SLinus Torvalds */ 12391da177e4SLinus Torvalds if (!udev->bus->is_b_host 12401da177e4SLinus Torvalds && udev->config 12411da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 12421da177e4SLinus Torvalds struct usb_otg_descriptor *desc = 0; 12431da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 12441da177e4SLinus Torvalds 12451da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 12461da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 12471da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 12481da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 12491da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 125012c3da34SAlan Stern unsigned port1 = udev->portnum; 12511da177e4SLinus Torvalds struct usb_device *root = udev->parent; 12521da177e4SLinus Torvalds 12531da177e4SLinus Torvalds dev_info(&udev->dev, 12541da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 12551da177e4SLinus Torvalds (port1 == bus->otg_port) 12561da177e4SLinus Torvalds ? "" : "non-"); 12571da177e4SLinus Torvalds 12581da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 12591da177e4SLinus Torvalds if (port1 == bus->otg_port) 12601da177e4SLinus Torvalds bus->b_hnp_enable = 1; 12611da177e4SLinus Torvalds err = usb_control_msg(udev, 12621da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 12631da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 12641da177e4SLinus Torvalds bus->b_hnp_enable 12651da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 12661da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 12671da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 12681da177e4SLinus Torvalds if (err < 0) { 12691da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 12701da177e4SLinus Torvalds * customize to match your product. 12711da177e4SLinus Torvalds */ 12721da177e4SLinus Torvalds dev_info(&udev->dev, 12731da177e4SLinus Torvalds "can't set HNP mode; %d\n", 12741da177e4SLinus Torvalds err); 12751da177e4SLinus Torvalds bus->b_hnp_enable = 0; 12761da177e4SLinus Torvalds } 12771da177e4SLinus Torvalds } 12781da177e4SLinus Torvalds } 12791da177e4SLinus Torvalds } 12801da177e4SLinus Torvalds 12811da177e4SLinus Torvalds if (!is_targeted(udev)) { 12821da177e4SLinus Torvalds 12831da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 12841da177e4SLinus Torvalds * (Includes HNP test device.) 12851da177e4SLinus Torvalds */ 12861da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 1287140d8f68SAlan Stern static int __usb_port_suspend(struct usb_device *, 1288390a8c34SDavid Brownell int port1); 1289140d8f68SAlan Stern err = __usb_port_suspend(udev, udev->bus->otg_port); 12901da177e4SLinus Torvalds if (err < 0) 12911da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 12921da177e4SLinus Torvalds } 12931da177e4SLinus Torvalds err = -ENODEV; 12941da177e4SLinus Torvalds goto fail; 12951da177e4SLinus Torvalds } 12961da177e4SLinus Torvalds #endif 12971da177e4SLinus Torvalds 1298782da727SAlan Stern /* Register the device. The device driver is responsible 1299782da727SAlan Stern * for adding the device files to usbfs and sysfs and for 1300782da727SAlan Stern * configuring the device. 1301782da727SAlan Stern */ 13021da177e4SLinus Torvalds err = device_add (&udev->dev); 13031da177e4SLinus Torvalds if (err) { 13041da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 13051da177e4SLinus Torvalds goto fail; 13061da177e4SLinus Torvalds } 13079ad3d6ccSAlan Stern 13081da177e4SLinus Torvalds return 0; 13091da177e4SLinus Torvalds 13101da177e4SLinus Torvalds fail: 13111da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 13121da177e4SLinus Torvalds return err; 13131da177e4SLinus Torvalds } 13141da177e4SLinus Torvalds 13151da177e4SLinus Torvalds 13161da177e4SLinus Torvalds static int hub_port_status(struct usb_hub *hub, int port1, 13171da177e4SLinus Torvalds u16 *status, u16 *change) 13181da177e4SLinus Torvalds { 13191da177e4SLinus Torvalds int ret; 13201da177e4SLinus Torvalds 13211da177e4SLinus Torvalds ret = get_port_status(hub->hdev, port1, &hub->status->port); 13221da177e4SLinus Torvalds if (ret < 0) 13231da177e4SLinus Torvalds dev_err (hub->intfdev, 13241da177e4SLinus Torvalds "%s failed (err = %d)\n", __FUNCTION__, ret); 13251da177e4SLinus Torvalds else { 13261da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->port.wPortStatus); 13271da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->port.wPortChange); 13281da177e4SLinus Torvalds ret = 0; 13291da177e4SLinus Torvalds } 13301da177e4SLinus Torvalds return ret; 13311da177e4SLinus Torvalds } 13321da177e4SLinus Torvalds 13330165de09SInaky Perez-Gonzalez 13340165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 13350165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 13360165de09SInaky Perez-Gonzalez { 13370165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 13380165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 13390165de09SInaky Perez-Gonzalez return 0; 13400165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 13410165de09SInaky Perez-Gonzalez return hcd->wireless; 13420165de09SInaky Perez-Gonzalez } 13430165de09SInaky Perez-Gonzalez 13440165de09SInaky Perez-Gonzalez 13451da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 13461da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 13471da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 13481da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 13491da177e4SLinus Torvalds #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) 13501da177e4SLinus Torvalds 13511da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 13521da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 13531da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 13541da177e4SLinus Torvalds #define HUB_RESET_TIMEOUT 500 13551da177e4SLinus Torvalds 13561da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 13571da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 13581da177e4SLinus Torvalds { 13591da177e4SLinus Torvalds int delay_time, ret; 13601da177e4SLinus Torvalds u16 portstatus; 13611da177e4SLinus Torvalds u16 portchange; 13621da177e4SLinus Torvalds 13631da177e4SLinus Torvalds for (delay_time = 0; 13641da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 13651da177e4SLinus Torvalds delay_time += delay) { 13661da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 13671da177e4SLinus Torvalds msleep(delay); 13681da177e4SLinus Torvalds 13691da177e4SLinus Torvalds /* read and decode port status */ 13701da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 13711da177e4SLinus Torvalds if (ret < 0) 13721da177e4SLinus Torvalds return ret; 13731da177e4SLinus Torvalds 13741da177e4SLinus Torvalds /* Device went away? */ 13751da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 13761da177e4SLinus Torvalds return -ENOTCONN; 13771da177e4SLinus Torvalds 13781da177e4SLinus Torvalds /* bomb out completely if something weird happened */ 13791da177e4SLinus Torvalds if ((portchange & USB_PORT_STAT_C_CONNECTION)) 13801da177e4SLinus Torvalds return -EINVAL; 13811da177e4SLinus Torvalds 13821da177e4SLinus Torvalds /* if we`ve finished resetting, then break out of the loop */ 13831da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_RESET) && 13841da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_ENABLE)) { 13850165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 13860165de09SInaky Perez-Gonzalez udev->speed = USB_SPEED_VARIABLE; 13870165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 13881da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 13891da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 13901da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 13911da177e4SLinus Torvalds else 13921da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 13931da177e4SLinus Torvalds return 0; 13941da177e4SLinus Torvalds } 13951da177e4SLinus Torvalds 13961da177e4SLinus Torvalds /* switch to the long delay after two short delay failures */ 13971da177e4SLinus Torvalds if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 13981da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 13991da177e4SLinus Torvalds 14001da177e4SLinus Torvalds dev_dbg (hub->intfdev, 14011da177e4SLinus Torvalds "port %d not reset yet, waiting %dms\n", 14021da177e4SLinus Torvalds port1, delay); 14031da177e4SLinus Torvalds } 14041da177e4SLinus Torvalds 14051da177e4SLinus Torvalds return -EBUSY; 14061da177e4SLinus Torvalds } 14071da177e4SLinus Torvalds 14081da177e4SLinus Torvalds static int hub_port_reset(struct usb_hub *hub, int port1, 14091da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 14101da177e4SLinus Torvalds { 14111da177e4SLinus Torvalds int i, status; 14121da177e4SLinus Torvalds 14131da177e4SLinus Torvalds /* Reset the port */ 14141da177e4SLinus Torvalds for (i = 0; i < PORT_RESET_TRIES; i++) { 14151da177e4SLinus Torvalds status = set_port_feature(hub->hdev, 14161da177e4SLinus Torvalds port1, USB_PORT_FEAT_RESET); 14171da177e4SLinus Torvalds if (status) 14181da177e4SLinus Torvalds dev_err(hub->intfdev, 14191da177e4SLinus Torvalds "cannot reset port %d (err = %d)\n", 14201da177e4SLinus Torvalds port1, status); 14211da177e4SLinus Torvalds else { 14221da177e4SLinus Torvalds status = hub_port_wait_reset(hub, port1, udev, delay); 1423dd16525bSDavid Brownell if (status && status != -ENOTCONN) 14241da177e4SLinus Torvalds dev_dbg(hub->intfdev, 14251da177e4SLinus Torvalds "port_wait_reset: err = %d\n", 14261da177e4SLinus Torvalds status); 14271da177e4SLinus Torvalds } 14281da177e4SLinus Torvalds 14291da177e4SLinus Torvalds /* return on disconnect or reset */ 14301da177e4SLinus Torvalds switch (status) { 14311da177e4SLinus Torvalds case 0: 1432b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 1433b789696aSDavid Brownell msleep(10 + 40); 14341da177e4SLinus Torvalds /* FALL THROUGH */ 14351da177e4SLinus Torvalds case -ENOTCONN: 14361da177e4SLinus Torvalds case -ENODEV: 14371da177e4SLinus Torvalds clear_port_feature(hub->hdev, 14381da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 14391da177e4SLinus Torvalds /* FIXME need disconnect() for NOTATTACHED device */ 14401da177e4SLinus Torvalds usb_set_device_state(udev, status 14411da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 14421da177e4SLinus Torvalds : USB_STATE_DEFAULT); 14431da177e4SLinus Torvalds return status; 14441da177e4SLinus Torvalds } 14451da177e4SLinus Torvalds 14461da177e4SLinus Torvalds dev_dbg (hub->intfdev, 14471da177e4SLinus Torvalds "port %d not enabled, trying reset again...\n", 14481da177e4SLinus Torvalds port1); 14491da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 14501da177e4SLinus Torvalds } 14511da177e4SLinus Torvalds 14521da177e4SLinus Torvalds dev_err (hub->intfdev, 14531da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 14541da177e4SLinus Torvalds port1); 14551da177e4SLinus Torvalds 14561da177e4SLinus Torvalds return status; 14571da177e4SLinus Torvalds } 14581da177e4SLinus Torvalds 14591da177e4SLinus Torvalds /* 14601da177e4SLinus Torvalds * Disable a port and mark a logical connnect-change event, so that some 14611da177e4SLinus Torvalds * time later khubd will disconnect() any existing usb_device on the port 14621da177e4SLinus Torvalds * and will re-enumerate if there actually is a device attached. 14631da177e4SLinus Torvalds */ 14641da177e4SLinus Torvalds static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 14651da177e4SLinus Torvalds { 14661da177e4SLinus Torvalds dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 14671da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 14681da177e4SLinus Torvalds 14691da177e4SLinus Torvalds /* FIXME let caller ask to power down the port: 14701da177e4SLinus Torvalds * - some devices won't enumerate without a VBUS power cycle 14711da177e4SLinus Torvalds * - SRP saves power that way 1472390a8c34SDavid Brownell * - ... new call, TBD ... 14731da177e4SLinus Torvalds * That's easy if this hub can switch power per-port, and 14741da177e4SLinus Torvalds * khubd reactivates the port later (timer, SRP, etc). 14751da177e4SLinus Torvalds * Powerdown must be optional, because of reset/DFU. 14761da177e4SLinus Torvalds */ 14771da177e4SLinus Torvalds 14781da177e4SLinus Torvalds set_bit(port1, hub->change_bits); 14791da177e4SLinus Torvalds kick_khubd(hub); 14801da177e4SLinus Torvalds } 14811da177e4SLinus Torvalds 1482d388dab7SAlan Stern #ifdef CONFIG_PM 14831da177e4SLinus Torvalds 14841da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 14851da177e4SLinus Torvalds 14861da177e4SLinus Torvalds /* 14871da177e4SLinus Torvalds * Selective port suspend reduces power; most suspended devices draw 14881da177e4SLinus Torvalds * less than 500 uA. It's also used in OTG, along with remote wakeup. 14891da177e4SLinus Torvalds * All devices below the suspended port are also suspended. 14901da177e4SLinus Torvalds * 14911da177e4SLinus Torvalds * Devices leave suspend state when the host wakes them up. Some devices 14921da177e4SLinus Torvalds * also support "remote wakeup", where the device can activate the USB 14931da177e4SLinus Torvalds * tree above them to deliver data, such as a keypress or packet. In 14941da177e4SLinus Torvalds * some cases, this wakes the USB host. 14951da177e4SLinus Torvalds */ 14961da177e4SLinus Torvalds static int hub_port_suspend(struct usb_hub *hub, int port1, 14971da177e4SLinus Torvalds struct usb_device *udev) 14981da177e4SLinus Torvalds { 14991da177e4SLinus Torvalds int status; 15001da177e4SLinus Torvalds 15011da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "suspend port %d\n", port1); 15021da177e4SLinus Torvalds 15031da177e4SLinus Torvalds /* enable remote wakeup when appropriate; this lets the device 15041da177e4SLinus Torvalds * wake up the upstream hub (including maybe the root hub). 15051da177e4SLinus Torvalds * 15061da177e4SLinus Torvalds * NOTE: OTG devices may issue remote wakeup (or SRP) even when 15071da177e4SLinus Torvalds * we don't explicitly enable it here. 15081da177e4SLinus Torvalds */ 1509645daaabSAlan Stern if (udev->do_remote_wakeup) { 15101da177e4SLinus Torvalds status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 15111da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 15121da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 15131da177e4SLinus Torvalds NULL, 0, 15141da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 15151da177e4SLinus Torvalds if (status) 15161da177e4SLinus Torvalds dev_dbg(&udev->dev, 15171da177e4SLinus Torvalds "won't remote wakeup, status %d\n", 15181da177e4SLinus Torvalds status); 15191da177e4SLinus Torvalds } 15201da177e4SLinus Torvalds 15211da177e4SLinus Torvalds /* see 7.1.7.6 */ 15221da177e4SLinus Torvalds status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); 15231da177e4SLinus Torvalds if (status) { 15241da177e4SLinus Torvalds dev_dbg(hub->intfdev, 15251da177e4SLinus Torvalds "can't suspend port %d, status %d\n", 15261da177e4SLinus Torvalds port1, status); 15271da177e4SLinus Torvalds /* paranoia: "should not happen" */ 15281da177e4SLinus Torvalds (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 15291da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 15301da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 15311da177e4SLinus Torvalds NULL, 0, 15321da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 15331da177e4SLinus Torvalds } else { 15341da177e4SLinus Torvalds /* device has up to 10 msec to fully suspend */ 1535645daaabSAlan Stern dev_dbg(&udev->dev, "usb %ssuspend\n", 1536645daaabSAlan Stern udev->auto_pm ? "auto-" : ""); 15371da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_SUSPENDED); 15381da177e4SLinus Torvalds msleep(10); 15391da177e4SLinus Torvalds } 15401da177e4SLinus Torvalds return status; 15411da177e4SLinus Torvalds } 15421da177e4SLinus Torvalds 15431da177e4SLinus Torvalds /* 15441da177e4SLinus Torvalds * Devices on USB hub ports have only one "suspend" state, corresponding 1545ba9d35fbSPavel Machek * to ACPI D2, "may cause the device to lose some context". 15461da177e4SLinus Torvalds * State transitions include: 15471da177e4SLinus Torvalds * 15481da177e4SLinus Torvalds * - suspend, resume ... when the VBUS power link stays live 15491da177e4SLinus Torvalds * - suspend, disconnect ... VBUS lost 15501da177e4SLinus Torvalds * 15511da177e4SLinus Torvalds * Once VBUS drop breaks the circuit, the port it's using has to go through 15521da177e4SLinus Torvalds * normal re-enumeration procedures, starting with enabling VBUS power. 15531da177e4SLinus Torvalds * Other than re-initializing the hub (plug/unplug, except for root hubs), 15541da177e4SLinus Torvalds * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 15551da177e4SLinus Torvalds * timer, no SRP, no requests through sysfs. 1556390a8c34SDavid Brownell * 1557390a8c34SDavid Brownell * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when 1558390a8c34SDavid Brownell * the root hub for their bus goes into global suspend ... so we don't 1559390a8c34SDavid Brownell * (falsely) update the device power state to say it suspended. 15601da177e4SLinus Torvalds */ 1561140d8f68SAlan Stern static int __usb_port_suspend (struct usb_device *udev, int port1) 15621da177e4SLinus Torvalds { 1563f3f3253dSDavid Brownell int status = 0; 15641da177e4SLinus Torvalds 15651da177e4SLinus Torvalds /* caller owns the udev device lock */ 15661da177e4SLinus Torvalds if (port1 < 0) 15671da177e4SLinus Torvalds return port1; 15681da177e4SLinus Torvalds 1569140d8f68SAlan Stern /* we change the device's upstream USB link, 1570140d8f68SAlan Stern * but root hubs have no upstream USB link. 15711da177e4SLinus Torvalds */ 1572f3f3253dSDavid Brownell if (udev->parent) 15731da177e4SLinus Torvalds status = hub_port_suspend(hdev_to_hub(udev->parent), port1, 15741da177e4SLinus Torvalds udev); 15752bf4086dSAlan Stern else { 1576645daaabSAlan Stern dev_dbg(&udev->dev, "usb %ssuspend\n", 1577645daaabSAlan Stern udev->auto_pm ? "auto-" : ""); 15782bf4086dSAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 15792bf4086dSAlan Stern } 15801da177e4SLinus Torvalds return status; 15811da177e4SLinus Torvalds } 15821da177e4SLinus Torvalds 15835edbfb7cSDavid Brownell /* 1584140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 15851da177e4SLinus Torvalds * @udev: device that's no longer in active use 15865edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 15871da177e4SLinus Torvalds * 15881da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 15891da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 15901da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 1591140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 15921da177e4SLinus Torvalds * to disconnect devices while they are suspended. 15931da177e4SLinus Torvalds * 1594390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 1595390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 1596390a8c34SDavid Brownell * 15971da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 15981da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 15991da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 16001da177e4SLinus Torvalds * 16011da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 16021da177e4SLinus Torvalds */ 1603140d8f68SAlan Stern int usb_port_suspend(struct usb_device *udev) 16041da177e4SLinus Torvalds { 1605140d8f68SAlan Stern return __usb_port_suspend(udev, udev->portnum); 16061da177e4SLinus Torvalds } 1607f3f3253dSDavid Brownell 16081da177e4SLinus Torvalds /* 1609390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 1610390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 1611390a8c34SDavid Brownell * special" resume" signaling. These routines kick in shortly after 16121da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 16131da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 16141da177e4SLinus Torvalds * in the tree that's rooted at this device. 16151da177e4SLinus Torvalds */ 1616140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 16171da177e4SLinus Torvalds { 16181da177e4SLinus Torvalds int status; 16191da177e4SLinus Torvalds u16 devstatus; 16201da177e4SLinus Torvalds 16211da177e4SLinus Torvalds /* caller owns the udev device lock */ 1622f3f3253dSDavid Brownell dev_dbg(&udev->dev, "finish resume\n"); 16231da177e4SLinus Torvalds 16241da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 16251da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 16261da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 16271da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 16281da177e4SLinus Torvalds */ 16291da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 16301da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 16311da177e4SLinus Torvalds : USB_STATE_ADDRESS); 16321da177e4SLinus Torvalds 16331da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 16341da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 16351da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 16361da177e4SLinus Torvalds */ 16371da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 1638b40b7a90SAlan Stern if (status >= 0) 1639b40b7a90SAlan Stern status = (status == 2 ? 0 : -ENODEV); 1640b40b7a90SAlan Stern 1641b40b7a90SAlan Stern if (status) 16421da177e4SLinus Torvalds dev_dbg(&udev->dev, 16431da177e4SLinus Torvalds "gone after usb resume? status %d\n", 16441da177e4SLinus Torvalds status); 16451da177e4SLinus Torvalds else if (udev->actconfig) { 16461da177e4SLinus Torvalds le16_to_cpus(&devstatus); 164755c52718SAlan Stern if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) 1648f3f3253dSDavid Brownell && udev->parent) { 16491da177e4SLinus Torvalds status = usb_control_msg(udev, 16501da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 16511da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, 16521da177e4SLinus Torvalds USB_RECIP_DEVICE, 16531da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 16541da177e4SLinus Torvalds NULL, 0, 16551da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 1656a8e7c565SAlan Stern if (status) 16571da177e4SLinus Torvalds dev_dbg(&udev->dev, "disable remote " 16581da177e4SLinus Torvalds "wakeup, status %d\n", status); 16594bf0ba86SAlan Stern } 16601da177e4SLinus Torvalds status = 0; 16611da177e4SLinus Torvalds 16621da177e4SLinus Torvalds } else if (udev->devnum <= 0) { 16631da177e4SLinus Torvalds dev_dbg(&udev->dev, "bogus resume!\n"); 16641da177e4SLinus Torvalds status = -EINVAL; 16651da177e4SLinus Torvalds } 16661da177e4SLinus Torvalds return status; 16671da177e4SLinus Torvalds } 16681da177e4SLinus Torvalds 16691da177e4SLinus Torvalds static int 16701da177e4SLinus Torvalds hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev) 16711da177e4SLinus Torvalds { 16721da177e4SLinus Torvalds int status; 16731da177e4SLinus Torvalds 16741da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "resume port %d\n", port1); 16751da177e4SLinus Torvalds 1676d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 1677d5cbad4bSAlan Stern 16781da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 16791da177e4SLinus Torvalds status = clear_port_feature(hub->hdev, 16801da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 16811da177e4SLinus Torvalds if (status) { 16821da177e4SLinus Torvalds dev_dbg(hub->intfdev, 16831da177e4SLinus Torvalds "can't resume port %d, status %d\n", 16841da177e4SLinus Torvalds port1, status); 16851da177e4SLinus Torvalds } else { 16861da177e4SLinus Torvalds u16 devstatus; 16871da177e4SLinus Torvalds u16 portchange; 16881da177e4SLinus Torvalds 16891da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 16901da177e4SLinus Torvalds if (udev) 1691645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 1692645daaabSAlan Stern udev->auto_pm ? "auto-" : ""); 16931da177e4SLinus Torvalds msleep(25); 16941da177e4SLinus Torvalds 16951da177e4SLinus Torvalds #define LIVE_FLAGS ( USB_PORT_STAT_POWER \ 16961da177e4SLinus Torvalds | USB_PORT_STAT_ENABLE \ 16971da177e4SLinus Torvalds | USB_PORT_STAT_CONNECTION) 16981da177e4SLinus Torvalds 16991da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 17001da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 17011da177e4SLinus Torvalds * sequence. 17021da177e4SLinus Torvalds */ 17031da177e4SLinus Torvalds devstatus = portchange = 0; 17041da177e4SLinus Torvalds status = hub_port_status(hub, port1, 17051da177e4SLinus Torvalds &devstatus, &portchange); 17061da177e4SLinus Torvalds if (status < 0 17071da177e4SLinus Torvalds || (devstatus & LIVE_FLAGS) != LIVE_FLAGS 17081da177e4SLinus Torvalds || (devstatus & USB_PORT_STAT_SUSPEND) != 0 17091da177e4SLinus Torvalds ) { 17101da177e4SLinus Torvalds dev_dbg(hub->intfdev, 17111da177e4SLinus Torvalds "port %d status %04x.%04x after resume, %d\n", 17121da177e4SLinus Torvalds port1, portchange, devstatus, status); 171320307949SAlan Stern if (status >= 0) 171420307949SAlan Stern status = -ENODEV; 17151da177e4SLinus Torvalds } else { 171620307949SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 171720307949SAlan Stern clear_port_feature(hub->hdev, port1, 171820307949SAlan Stern USB_PORT_FEAT_C_SUSPEND); 17191da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 17201da177e4SLinus Torvalds msleep(10); 17211da177e4SLinus Torvalds if (udev) 1722140d8f68SAlan Stern status = finish_port_resume(udev); 17231da177e4SLinus Torvalds } 17241da177e4SLinus Torvalds } 17251da177e4SLinus Torvalds if (status < 0) 17261da177e4SLinus Torvalds hub_port_logical_disconnect(hub, port1); 17271da177e4SLinus Torvalds 1728d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 1729d5cbad4bSAlan Stern if (!hub->hdev->parent && !hub->busy_bits[0]) 1730d5cbad4bSAlan Stern usb_enable_root_hub_irq(hub->hdev->bus); 1731d5cbad4bSAlan Stern 17321da177e4SLinus Torvalds return status; 17331da177e4SLinus Torvalds } 17341da177e4SLinus Torvalds 17355edbfb7cSDavid Brownell /* 1736140d8f68SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 17371da177e4SLinus Torvalds * @udev: device to re-activate 17385edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 17391da177e4SLinus Torvalds * 17401da177e4SLinus Torvalds * This will re-activate the suspended device, increasing power usage 17411da177e4SLinus Torvalds * while letting drivers communicate again with its endpoints. 17421da177e4SLinus Torvalds * USB resume explicitly guarantees that the power session between 17431da177e4SLinus Torvalds * the host and the device is the same as it was when the device 17441da177e4SLinus Torvalds * suspended. 17451da177e4SLinus Torvalds * 17461da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 17471da177e4SLinus Torvalds */ 1748140d8f68SAlan Stern int usb_port_resume(struct usb_device *udev) 17491da177e4SLinus Torvalds { 1750d388dab7SAlan Stern int status; 17511da177e4SLinus Torvalds 1752140d8f68SAlan Stern /* we change the device's upstream USB link, 1753140d8f68SAlan Stern * but root hubs have no upstream USB link. 1754140d8f68SAlan Stern */ 1755f3f3253dSDavid Brownell if (udev->parent) { 17561da177e4SLinus Torvalds // NOTE this fails if parent is also suspended... 17571da177e4SLinus Torvalds status = hub_port_resume(hdev_to_hub(udev->parent), 175812c3da34SAlan Stern udev->portnum, udev); 1759645daaabSAlan Stern } else { 1760645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 1761645daaabSAlan Stern udev->auto_pm ? "auto-" : ""); 1762140d8f68SAlan Stern status = finish_port_resume(udev); 1763645daaabSAlan Stern } 1764f3f3253dSDavid Brownell if (status < 0) 1765a8e7c565SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 17661da177e4SLinus Torvalds return status; 17671da177e4SLinus Torvalds } 17681da177e4SLinus Torvalds 17691da177e4SLinus Torvalds static int remote_wakeup(struct usb_device *udev) 17701da177e4SLinus Torvalds { 17711da177e4SLinus Torvalds int status = 0; 17721da177e4SLinus Torvalds 1773645daaabSAlan Stern /* All this just to avoid sending a port-resume message 1774645daaabSAlan Stern * to the parent hub! */ 1775645daaabSAlan Stern 17769ad3d6ccSAlan Stern usb_lock_device(udev); 1777645daaabSAlan Stern mutex_lock_nested(&udev->pm_mutex, udev->level); 17781da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 1779645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 17801da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 17811da177e4SLinus Torvalds msleep(10); 1782140d8f68SAlan Stern status = finish_port_resume(udev); 1783645daaabSAlan Stern if (status == 0) 1784645daaabSAlan Stern udev->dev.power.power_state.event = PM_EVENT_ON; 17851da177e4SLinus Torvalds } 1786645daaabSAlan Stern mutex_unlock(&udev->pm_mutex); 1787a8e7c565SAlan Stern 1788a8e7c565SAlan Stern if (status == 0) 1789645daaabSAlan Stern usb_autoresume_device(udev, 0); 17909ad3d6ccSAlan Stern usb_unlock_device(udev); 17911da177e4SLinus Torvalds return status; 17921da177e4SLinus Torvalds } 17931da177e4SLinus Torvalds 1794d388dab7SAlan Stern #else /* CONFIG_USB_SUSPEND */ 1795d388dab7SAlan Stern 1796d388dab7SAlan Stern /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ 1797d388dab7SAlan Stern 1798d388dab7SAlan Stern int usb_port_suspend(struct usb_device *udev) 1799d388dab7SAlan Stern { 1800d388dab7SAlan Stern return 0; 1801d388dab7SAlan Stern } 1802d388dab7SAlan Stern 1803d388dab7SAlan Stern static inline int 1804d388dab7SAlan Stern finish_port_resume(struct usb_device *udev) 1805d388dab7SAlan Stern { 1806d388dab7SAlan Stern return 0; 1807d388dab7SAlan Stern } 1808d388dab7SAlan Stern 1809d388dab7SAlan Stern static inline int 1810d388dab7SAlan Stern hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev) 1811d388dab7SAlan Stern { 1812d388dab7SAlan Stern return 0; 1813d388dab7SAlan Stern } 1814d388dab7SAlan Stern 1815d388dab7SAlan Stern int usb_port_resume(struct usb_device *udev) 1816d388dab7SAlan Stern { 1817d388dab7SAlan Stern return 0; 1818d388dab7SAlan Stern } 1819d388dab7SAlan Stern 1820d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 1821d388dab7SAlan Stern { 1822d388dab7SAlan Stern return 0; 1823d388dab7SAlan Stern } 1824d388dab7SAlan Stern 1825d388dab7SAlan Stern #endif 1826d388dab7SAlan Stern 1827db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 18281da177e4SLinus Torvalds { 18291da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 18301da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 18311da177e4SLinus Torvalds unsigned port1; 18321da177e4SLinus Torvalds 1833c9f89fa4SDavid Brownell /* fail if children aren't already suspended */ 18341da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 18351da177e4SLinus Torvalds struct usb_device *udev; 18361da177e4SLinus Torvalds 18371da177e4SLinus Torvalds udev = hdev->children [port1-1]; 1838114b368cSAlan Stern if (udev && msg.event == PM_EVENT_SUSPEND && 1839f3f3253dSDavid Brownell #ifdef CONFIG_USB_SUSPEND 1840114b368cSAlan Stern udev->state != USB_STATE_SUSPENDED 1841114b368cSAlan Stern #else 1842114b368cSAlan Stern udev->dev.power.power_state.event 1843114b368cSAlan Stern == PM_EVENT_ON 1844f3f3253dSDavid Brownell #endif 1845114b368cSAlan Stern ) { 1846645daaabSAlan Stern if (!hdev->auto_pm) 1847645daaabSAlan Stern dev_dbg(&intf->dev, "port %d nyet suspended\n", 1848645daaabSAlan Stern port1); 1849c9f89fa4SDavid Brownell return -EBUSY; 1850c9f89fa4SDavid Brownell } 18511da177e4SLinus Torvalds } 18521da177e4SLinus Torvalds 1853f3f3253dSDavid Brownell /* "global suspend" of the downstream HC-to-USB interface */ 1854f3f3253dSDavid Brownell if (!hdev->parent) { 1855f3f3253dSDavid Brownell struct usb_bus *bus = hdev->bus; 18560c0382e3SAlan Stern if (bus) { 18570c0382e3SAlan Stern int status = hcd_bus_suspend (bus); 1858f3f3253dSDavid Brownell 1859f3f3253dSDavid Brownell if (status != 0) { 1860f3f3253dSDavid Brownell dev_dbg(&hdev->dev, "'global' suspend %d\n", 1861f3f3253dSDavid Brownell status); 1862f3f3253dSDavid Brownell return status; 1863f3f3253dSDavid Brownell } 1864f3f3253dSDavid Brownell } else 1865f3f3253dSDavid Brownell return -EOPNOTSUPP; 1866f3f3253dSDavid Brownell } 1867f3f3253dSDavid Brownell 1868c9f89fa4SDavid Brownell /* stop khubd and related activity */ 1869c9f89fa4SDavid Brownell hub_quiesce(hub); 18701da177e4SLinus Torvalds return 0; 18711da177e4SLinus Torvalds } 18721da177e4SLinus Torvalds 18731da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 18741da177e4SLinus Torvalds { 18751da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev(intf); 18761da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 18771da177e4SLinus Torvalds int status; 18781da177e4SLinus Torvalds 1879f3f3253dSDavid Brownell /* "global resume" of the downstream HC-to-USB interface */ 1880f3f3253dSDavid Brownell if (!hdev->parent) { 1881f3f3253dSDavid Brownell struct usb_bus *bus = hdev->bus; 18820c0382e3SAlan Stern if (bus) { 18830c0382e3SAlan Stern status = hcd_bus_resume (bus); 1884f3f3253dSDavid Brownell if (status) { 1885f3f3253dSDavid Brownell dev_dbg(&intf->dev, "'global' resume %d\n", 1886f3f3253dSDavid Brownell status); 1887f3f3253dSDavid Brownell return status; 1888f3f3253dSDavid Brownell } 1889f3f3253dSDavid Brownell } else 1890f3f3253dSDavid Brownell return -EOPNOTSUPP; 1891f3f3253dSDavid Brownell if (status == 0) { 1892f3f3253dSDavid Brownell /* TRSMRCY = 10 msec */ 1893f3f3253dSDavid Brownell msleep(10); 1894f3f3253dSDavid Brownell } 1895f3f3253dSDavid Brownell } 1896f3f3253dSDavid Brownell 1897a8e7c565SAlan Stern /* tell khubd to look for changes on this hub */ 1898f3f3253dSDavid Brownell hub_activate(hub); 18991da177e4SLinus Torvalds return 0; 19001da177e4SLinus Torvalds } 19011da177e4SLinus Torvalds 1902d388dab7SAlan Stern #else /* CONFIG_PM */ 1903d388dab7SAlan Stern 1904d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 1905d388dab7SAlan Stern { 1906d388dab7SAlan Stern return 0; 1907d388dab7SAlan Stern } 1908d388dab7SAlan Stern 1909511366daSAndrew Morton #define hub_suspend NULL 1910511366daSAndrew Morton #define hub_resume NULL 1911d388dab7SAlan Stern #endif 1912d388dab7SAlan Stern 19131da177e4SLinus Torvalds void usb_resume_root_hub(struct usb_device *hdev) 19141da177e4SLinus Torvalds { 19151da177e4SLinus Torvalds struct usb_hub *hub = hdev_to_hub(hdev); 19161da177e4SLinus Torvalds 19171da177e4SLinus Torvalds hub->resume_root_hub = 1; 19181da177e4SLinus Torvalds kick_khubd(hub); 19191da177e4SLinus Torvalds } 19201da177e4SLinus Torvalds 19211da177e4SLinus Torvalds 19221da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 19231da177e4SLinus Torvalds * 19241da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 19251da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 19261da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 19271da177e4SLinus Torvalds * 19281da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 19291da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 19301da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 19311da177e4SLinus Torvalds * 19321da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 19331da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 19341da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 19351da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 19361da177e4SLinus Torvalds */ 19371da177e4SLinus Torvalds 19381da177e4SLinus Torvalds #define HUB_DEBOUNCE_TIMEOUT 1500 19391da177e4SLinus Torvalds #define HUB_DEBOUNCE_STEP 25 19401da177e4SLinus Torvalds #define HUB_DEBOUNCE_STABLE 100 19411da177e4SLinus Torvalds 19421da177e4SLinus Torvalds static int hub_port_debounce(struct usb_hub *hub, int port1) 19431da177e4SLinus Torvalds { 19441da177e4SLinus Torvalds int ret; 19451da177e4SLinus Torvalds int total_time, stable_time = 0; 19461da177e4SLinus Torvalds u16 portchange, portstatus; 19471da177e4SLinus Torvalds unsigned connection = 0xffff; 19481da177e4SLinus Torvalds 19491da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 19501da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 19511da177e4SLinus Torvalds if (ret < 0) 19521da177e4SLinus Torvalds return ret; 19531da177e4SLinus Torvalds 19541da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 19551da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 19561da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 19571da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 19581da177e4SLinus Torvalds break; 19591da177e4SLinus Torvalds } else { 19601da177e4SLinus Torvalds stable_time = 0; 19611da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 19621da177e4SLinus Torvalds } 19631da177e4SLinus Torvalds 19641da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 19651da177e4SLinus Torvalds clear_port_feature(hub->hdev, port1, 19661da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 19671da177e4SLinus Torvalds } 19681da177e4SLinus Torvalds 19691da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 19701da177e4SLinus Torvalds break; 19711da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 19721da177e4SLinus Torvalds } 19731da177e4SLinus Torvalds 19741da177e4SLinus Torvalds dev_dbg (hub->intfdev, 19751da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 19761da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 19771da177e4SLinus Torvalds 19781da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 19791da177e4SLinus Torvalds return -ETIMEDOUT; 19801da177e4SLinus Torvalds return portstatus; 19811da177e4SLinus Torvalds } 19821da177e4SLinus Torvalds 19831da177e4SLinus Torvalds static void ep0_reinit(struct usb_device *udev) 19841da177e4SLinus Torvalds { 19851da177e4SLinus Torvalds usb_disable_endpoint(udev, 0 + USB_DIR_IN); 19861da177e4SLinus Torvalds usb_disable_endpoint(udev, 0 + USB_DIR_OUT); 19871da177e4SLinus Torvalds udev->ep_in[0] = udev->ep_out[0] = &udev->ep0; 19881da177e4SLinus Torvalds } 19891da177e4SLinus Torvalds 19901da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 19911da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 19921da177e4SLinus Torvalds 19931da177e4SLinus Torvalds static int hub_set_address(struct usb_device *udev) 19941da177e4SLinus Torvalds { 19951da177e4SLinus Torvalds int retval; 19961da177e4SLinus Torvalds 19971da177e4SLinus Torvalds if (udev->devnum == 0) 19981da177e4SLinus Torvalds return -EINVAL; 19991da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 20001da177e4SLinus Torvalds return 0; 20011da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 20021da177e4SLinus Torvalds return -EINVAL; 20031da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 20041da177e4SLinus Torvalds USB_REQ_SET_ADDRESS, 0, udev->devnum, 0, 20051da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 20061da177e4SLinus Torvalds if (retval == 0) { 20071da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 20081da177e4SLinus Torvalds ep0_reinit(udev); 20091da177e4SLinus Torvalds } 20101da177e4SLinus Torvalds return retval; 20111da177e4SLinus Torvalds } 20121da177e4SLinus Torvalds 20131da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 20141da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 20151da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 20161da177e4SLinus Torvalds * 20171da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 20181da177e4SLinus Torvalds * usb_reset_device), the caller must own the device lock. For a 20191da177e4SLinus Torvalds * newly detected device that is not accessible through any global 20201da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 20211da177e4SLinus Torvalds */ 20221da177e4SLinus Torvalds static int 20231da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 20241da177e4SLinus Torvalds int retry_counter) 20251da177e4SLinus Torvalds { 20264186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 20271da177e4SLinus Torvalds 20281da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 20291da177e4SLinus Torvalds int i, j, retval; 20301da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 20311da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 203283a07196SInaky Perez-Gonzalez char *speed, *type; 20331da177e4SLinus Torvalds 20341da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 20351da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 20361da177e4SLinus Torvalds */ 20371da177e4SLinus Torvalds if (!hdev->parent) { 20381da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 20391da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 20401da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 20411da177e4SLinus Torvalds } 20421da177e4SLinus Torvalds 20431da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 20441da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 20451da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 20461da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 20471da177e4SLinus Torvalds 20484186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 20491da177e4SLinus Torvalds 20501da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 20511da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 20521da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 20531da177e4SLinus Torvalds goto fail; 20541da177e4SLinus Torvalds /* success, speed is known */ 20551da177e4SLinus Torvalds retval = -ENODEV; 20561da177e4SLinus Torvalds 20571da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 20581da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 20591da177e4SLinus Torvalds goto fail; 20601da177e4SLinus Torvalds } 20611da177e4SLinus Torvalds oldspeed = udev->speed; 20621da177e4SLinus Torvalds 20631da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 20641da177e4SLinus Torvalds * it's fixed size except for full speed devices. 20655bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 20665bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 20671da177e4SLinus Torvalds */ 20681da177e4SLinus Torvalds switch (udev->speed) { 20695bb6e0aeSInaky Perez-Gonzalez case USB_SPEED_VARIABLE: /* fixed at 512 */ 20705bb6e0aeSInaky Perez-Gonzalez udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512); 20715bb6e0aeSInaky Perez-Gonzalez break; 20721da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 20731da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); 20741da177e4SLinus Torvalds break; 20751da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 20761da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 20771da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 20781da177e4SLinus Torvalds * then correct our initial guess. 20791da177e4SLinus Torvalds */ 20801da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); 20811da177e4SLinus Torvalds break; 20821da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 20831da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8); 20841da177e4SLinus Torvalds break; 20851da177e4SLinus Torvalds default: 20861da177e4SLinus Torvalds goto fail; 20871da177e4SLinus Torvalds } 20881da177e4SLinus Torvalds 208983a07196SInaky Perez-Gonzalez type = ""; 209083a07196SInaky Perez-Gonzalez switch (udev->speed) { 20911da177e4SLinus Torvalds case USB_SPEED_LOW: speed = "low"; break; 20921da177e4SLinus Torvalds case USB_SPEED_FULL: speed = "full"; break; 20931da177e4SLinus Torvalds case USB_SPEED_HIGH: speed = "high"; break; 209483a07196SInaky Perez-Gonzalez case USB_SPEED_VARIABLE: 209583a07196SInaky Perez-Gonzalez speed = "variable"; 209683a07196SInaky Perez-Gonzalez type = "Wireless "; 209783a07196SInaky Perez-Gonzalez break; 20981da177e4SLinus Torvalds default: speed = "?"; break; 209983a07196SInaky Perez-Gonzalez } 210083a07196SInaky Perez-Gonzalez dev_info (&udev->dev, 210183a07196SInaky Perez-Gonzalez "%s %s speed %sUSB device using %s and address %d\n", 210283a07196SInaky Perez-Gonzalez (udev->config) ? "reset" : "new", speed, type, 210383a07196SInaky Perez-Gonzalez udev->bus->controller->driver->name, udev->devnum); 21041da177e4SLinus Torvalds 21051da177e4SLinus Torvalds /* Set up TT records, if needed */ 21061da177e4SLinus Torvalds if (hdev->tt) { 21071da177e4SLinus Torvalds udev->tt = hdev->tt; 21081da177e4SLinus Torvalds udev->ttport = hdev->ttport; 21091da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 21101da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 21111da177e4SLinus Torvalds udev->tt = &hub->tt; 21121da177e4SLinus Torvalds udev->ttport = port1; 21131da177e4SLinus Torvalds } 21141da177e4SLinus Torvalds 21151da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 21161da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 21171da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 21181da177e4SLinus Torvalds * Change it cautiously. 21191da177e4SLinus Torvalds * 21201da177e4SLinus Torvalds * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 21211da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 21221da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 21231da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 21241da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 21251da177e4SLinus Torvalds * value. 21261da177e4SLinus Torvalds */ 21271da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 21281da177e4SLinus Torvalds if (USE_NEW_SCHEME(retry_counter)) { 21291da177e4SLinus Torvalds struct usb_device_descriptor *buf; 21301da177e4SLinus Torvalds int r = 0; 21311da177e4SLinus Torvalds 21321da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 21331da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 21341da177e4SLinus Torvalds if (!buf) { 21351da177e4SLinus Torvalds retval = -ENOMEM; 21361da177e4SLinus Torvalds continue; 21371da177e4SLinus Torvalds } 21381da177e4SLinus Torvalds 21391da177e4SLinus Torvalds /* Use a short timeout the first time through, 21401da177e4SLinus Torvalds * so that recalcitrant full-speed devices with 21411da177e4SLinus Torvalds * 8- or 16-byte ep0-maxpackets won't slow things 21421da177e4SLinus Torvalds * down tremendously by NAKing the unexpectedly 21431da177e4SLinus Torvalds * early status stage. Also, retry on all errors; 21441da177e4SLinus Torvalds * some devices are flakey. 21455bb6e0aeSInaky Perez-Gonzalez * 255 is for WUSB devices, we actually need to use 512. 21465bb6e0aeSInaky Perez-Gonzalez * WUSB1.0[4.8.1]. 21471da177e4SLinus Torvalds */ 21481da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 21491da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 21501da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 21511da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 21521da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 21531da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 21541da177e4SLinus Torvalds (i ? USB_CTRL_GET_TIMEOUT : 1000)); 21551da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 21565bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 21571da177e4SLinus Torvalds if (buf->bDescriptorType == 21581da177e4SLinus Torvalds USB_DT_DEVICE) { 21591da177e4SLinus Torvalds r = 0; 21601da177e4SLinus Torvalds break; 21611da177e4SLinus Torvalds } 21621da177e4SLinus Torvalds /* FALL THROUGH */ 21631da177e4SLinus Torvalds default: 21641da177e4SLinus Torvalds if (r == 0) 21651da177e4SLinus Torvalds r = -EPROTO; 21661da177e4SLinus Torvalds break; 21671da177e4SLinus Torvalds } 21681da177e4SLinus Torvalds if (r == 0) 21691da177e4SLinus Torvalds break; 21701da177e4SLinus Torvalds } 21711da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 21721da177e4SLinus Torvalds buf->bMaxPacketSize0; 21731da177e4SLinus Torvalds kfree(buf); 21741da177e4SLinus Torvalds 21751da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 21761da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 21771da177e4SLinus Torvalds goto fail; 21781da177e4SLinus Torvalds if (oldspeed != udev->speed) { 21791da177e4SLinus Torvalds dev_dbg(&udev->dev, 21801da177e4SLinus Torvalds "device reset changed speed!\n"); 21811da177e4SLinus Torvalds retval = -ENODEV; 21821da177e4SLinus Torvalds goto fail; 21831da177e4SLinus Torvalds } 21841da177e4SLinus Torvalds if (r) { 21851da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor " 21861da177e4SLinus Torvalds "read/%s, error %d\n", 21871da177e4SLinus Torvalds "64", r); 21881da177e4SLinus Torvalds retval = -EMSGSIZE; 21891da177e4SLinus Torvalds continue; 21901da177e4SLinus Torvalds } 21911da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 21921da177e4SLinus Torvalds } 21931da177e4SLinus Torvalds 21941da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 21951da177e4SLinus Torvalds retval = hub_set_address(udev); 21961da177e4SLinus Torvalds if (retval >= 0) 21971da177e4SLinus Torvalds break; 21981da177e4SLinus Torvalds msleep(200); 21991da177e4SLinus Torvalds } 22001da177e4SLinus Torvalds if (retval < 0) { 22011da177e4SLinus Torvalds dev_err(&udev->dev, 22021da177e4SLinus Torvalds "device not accepting address %d, error %d\n", 22031da177e4SLinus Torvalds udev->devnum, retval); 22041da177e4SLinus Torvalds goto fail; 22051da177e4SLinus Torvalds } 22061da177e4SLinus Torvalds 22071da177e4SLinus Torvalds /* cope with hardware quirkiness: 22081da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 22091da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 22101da177e4SLinus Torvalds */ 22111da177e4SLinus Torvalds msleep(10); 22121da177e4SLinus Torvalds if (USE_NEW_SCHEME(retry_counter)) 22131da177e4SLinus Torvalds break; 22141da177e4SLinus Torvalds 22151da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 22161da177e4SLinus Torvalds if (retval < 8) { 22171da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor " 22181da177e4SLinus Torvalds "read/%s, error %d\n", 22191da177e4SLinus Torvalds "8", retval); 22201da177e4SLinus Torvalds if (retval >= 0) 22211da177e4SLinus Torvalds retval = -EMSGSIZE; 22221da177e4SLinus Torvalds } else { 22231da177e4SLinus Torvalds retval = 0; 22241da177e4SLinus Torvalds break; 22251da177e4SLinus Torvalds } 22261da177e4SLinus Torvalds } 22271da177e4SLinus Torvalds if (retval) 22281da177e4SLinus Torvalds goto fail; 22291da177e4SLinus Torvalds 22305bb6e0aeSInaky Perez-Gonzalez i = udev->descriptor.bMaxPacketSize0 == 0xff? 22315bb6e0aeSInaky Perez-Gonzalez 512 : udev->descriptor.bMaxPacketSize0; 22321da177e4SLinus Torvalds if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { 22331da177e4SLinus Torvalds if (udev->speed != USB_SPEED_FULL || 22341da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 22351da177e4SLinus Torvalds dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); 22361da177e4SLinus Torvalds retval = -EMSGSIZE; 22371da177e4SLinus Torvalds goto fail; 22381da177e4SLinus Torvalds } 22391da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 22401da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 22411da177e4SLinus Torvalds ep0_reinit(udev); 22421da177e4SLinus Torvalds } 22431da177e4SLinus Torvalds 22441da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 22451da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 22461da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor read/%s, error %d\n", 22471da177e4SLinus Torvalds "all", retval); 22481da177e4SLinus Torvalds if (retval >= 0) 22491da177e4SLinus Torvalds retval = -ENOMSG; 22501da177e4SLinus Torvalds goto fail; 22511da177e4SLinus Torvalds } 22521da177e4SLinus Torvalds 22531da177e4SLinus Torvalds retval = 0; 22541da177e4SLinus Torvalds 22551da177e4SLinus Torvalds fail: 22561da177e4SLinus Torvalds if (retval) 22571da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 22584186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 22591da177e4SLinus Torvalds return retval; 22601da177e4SLinus Torvalds } 22611da177e4SLinus Torvalds 22621da177e4SLinus Torvalds static void 22631da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 22641da177e4SLinus Torvalds { 22651da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 22661da177e4SLinus Torvalds int status; 22671da177e4SLinus Torvalds 22681da177e4SLinus Torvalds qual = kmalloc (sizeof *qual, SLAB_KERNEL); 22691da177e4SLinus Torvalds if (qual == NULL) 22701da177e4SLinus Torvalds return; 22711da177e4SLinus Torvalds 22721da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 22731da177e4SLinus Torvalds qual, sizeof *qual); 22741da177e4SLinus Torvalds if (status == sizeof *qual) { 22751da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 22761da177e4SLinus Torvalds "connect to a high speed hub\n"); 22771da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 22781da177e4SLinus Torvalds if (hub->has_indicators) { 22791da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 22801da177e4SLinus Torvalds schedule_work (&hub->leds); 22811da177e4SLinus Torvalds } 22821da177e4SLinus Torvalds } 22831da177e4SLinus Torvalds kfree(qual); 22841da177e4SLinus Torvalds } 22851da177e4SLinus Torvalds 22861da177e4SLinus Torvalds static unsigned 22871da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 22881da177e4SLinus Torvalds { 22891da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 22901da177e4SLinus Torvalds int remaining; 229155c52718SAlan Stern int port1; 22921da177e4SLinus Torvalds 229355c52718SAlan Stern if (!hub->limited_power) 22941da177e4SLinus Torvalds return 0; 22951da177e4SLinus Torvalds 229655c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 229755c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 229855c52718SAlan Stern struct usb_device *udev = hdev->children[port1 - 1]; 229955c52718SAlan Stern int delta; 23001da177e4SLinus Torvalds 23011da177e4SLinus Torvalds if (!udev) 23021da177e4SLinus Torvalds continue; 23031da177e4SLinus Torvalds 230455c52718SAlan Stern /* Unconfigured devices may not use more than 100mA, 230555c52718SAlan Stern * or 8mA for OTG ports */ 23061da177e4SLinus Torvalds if (udev->actconfig) 230755c52718SAlan Stern delta = udev->actconfig->desc.bMaxPower * 2; 230855c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 230955c52718SAlan Stern delta = 100; 23101da177e4SLinus Torvalds else 231155c52718SAlan Stern delta = 8; 231255c52718SAlan Stern if (delta > hub->mA_per_port) 231355c52718SAlan Stern dev_warn(&udev->dev, "%dmA is over %umA budget " 231455c52718SAlan Stern "for port %d!\n", 231555c52718SAlan Stern delta, hub->mA_per_port, port1); 23161da177e4SLinus Torvalds remaining -= delta; 23171da177e4SLinus Torvalds } 23181da177e4SLinus Torvalds if (remaining < 0) { 231955c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 232055c52718SAlan Stern - remaining); 23211da177e4SLinus Torvalds remaining = 0; 23221da177e4SLinus Torvalds } 23231da177e4SLinus Torvalds return remaining; 23241da177e4SLinus Torvalds } 23251da177e4SLinus Torvalds 23261da177e4SLinus Torvalds /* Handle physical or logical connection change events. 23271da177e4SLinus Torvalds * This routine is called when: 23281da177e4SLinus Torvalds * a port connection-change occurs; 23291da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 23301da177e4SLinus Torvalds * usb_reset_device() encounters changed descriptors (as from 23311da177e4SLinus Torvalds * a firmware download) 23321da177e4SLinus Torvalds * caller already locked the hub 23331da177e4SLinus Torvalds */ 23341da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 23351da177e4SLinus Torvalds u16 portstatus, u16 portchange) 23361da177e4SLinus Torvalds { 23371da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 23381da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 233974ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 23401da177e4SLinus Torvalds int status, i; 23411da177e4SLinus Torvalds 23421da177e4SLinus Torvalds dev_dbg (hub_dev, 23431da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 23441da177e4SLinus Torvalds port1, portstatus, portchange, portspeed (portstatus)); 23451da177e4SLinus Torvalds 23461da177e4SLinus Torvalds if (hub->has_indicators) { 23471da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 23481da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 23491da177e4SLinus Torvalds } 23501da177e4SLinus Torvalds 23511da177e4SLinus Torvalds /* Disconnect any existing devices under this port */ 23521da177e4SLinus Torvalds if (hdev->children[port1-1]) 23531da177e4SLinus Torvalds usb_disconnect(&hdev->children[port1-1]); 23541da177e4SLinus Torvalds clear_bit(port1, hub->change_bits); 23551da177e4SLinus Torvalds 23561da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 23571da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 23581da177e4SLinus Torvalds if (hdev->bus->is_b_host) 23591da177e4SLinus Torvalds portchange &= ~USB_PORT_STAT_C_CONNECTION; 23601da177e4SLinus Torvalds #endif 23611da177e4SLinus Torvalds 23621da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 23631da177e4SLinus Torvalds status = hub_port_debounce(hub, port1); 23641da177e4SLinus Torvalds if (status < 0) { 23651da177e4SLinus Torvalds dev_err (hub_dev, 23661da177e4SLinus Torvalds "connect-debounce failed, port %d disabled\n", 23671da177e4SLinus Torvalds port1); 23681da177e4SLinus Torvalds goto done; 23691da177e4SLinus Torvalds } 23701da177e4SLinus Torvalds portstatus = status; 23711da177e4SLinus Torvalds } 23721da177e4SLinus Torvalds 23731da177e4SLinus Torvalds /* Return now if nothing is connected */ 23741da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) { 23751da177e4SLinus Torvalds 23761da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 237774ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 23781da177e4SLinus Torvalds && !(portstatus & (1 << USB_PORT_FEAT_POWER))) 23791da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 23801da177e4SLinus Torvalds 23811da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 23821da177e4SLinus Torvalds goto done; 23831da177e4SLinus Torvalds return; 23841da177e4SLinus Torvalds } 23851da177e4SLinus Torvalds 23861da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 23871da177e4SLinus Torvalds /* If something is connected, but the port is suspended, wake it up. */ 23881da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_SUSPEND) { 23891da177e4SLinus Torvalds status = hub_port_resume(hub, port1, NULL); 23901da177e4SLinus Torvalds if (status < 0) { 23911da177e4SLinus Torvalds dev_dbg(hub_dev, 23921da177e4SLinus Torvalds "can't clear suspend on port %d; %d\n", 23931da177e4SLinus Torvalds port1, status); 23941da177e4SLinus Torvalds goto done; 23951da177e4SLinus Torvalds } 23961da177e4SLinus Torvalds } 23971da177e4SLinus Torvalds #endif 23981da177e4SLinus Torvalds 23991da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 24001da177e4SLinus Torvalds struct usb_device *udev; 24011da177e4SLinus Torvalds 24021da177e4SLinus Torvalds /* reallocate for each attempt, since references 24031da177e4SLinus Torvalds * to the previous one can escape in various ways 24041da177e4SLinus Torvalds */ 24051da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 24061da177e4SLinus Torvalds if (!udev) { 24071da177e4SLinus Torvalds dev_err (hub_dev, 24081da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 24091da177e4SLinus Torvalds port1); 24101da177e4SLinus Torvalds goto done; 24111da177e4SLinus Torvalds } 24121da177e4SLinus Torvalds 24131da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 24141da177e4SLinus Torvalds udev->speed = USB_SPEED_UNKNOWN; 241555c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 2416b6956ffaSAlan Stern udev->level = hdev->level + 1; 24171da177e4SLinus Torvalds 24181da177e4SLinus Torvalds /* set the address */ 24191da177e4SLinus Torvalds choose_address(udev); 24201da177e4SLinus Torvalds if (udev->devnum <= 0) { 24211da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 24221da177e4SLinus Torvalds goto loop; 24231da177e4SLinus Torvalds } 24241da177e4SLinus Torvalds 24251da177e4SLinus Torvalds /* reset and get descriptor */ 24261da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 24271da177e4SLinus Torvalds if (status < 0) 24281da177e4SLinus Torvalds goto loop; 24291da177e4SLinus Torvalds 24301da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 24311da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 24321da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 24331da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 24341da177e4SLinus Torvalds * on the parent. 24351da177e4SLinus Torvalds */ 24361da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 243755c52718SAlan Stern && udev->bus_mA <= 100) { 24381da177e4SLinus Torvalds u16 devstat; 24391da177e4SLinus Torvalds 24401da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 24411da177e4SLinus Torvalds &devstat); 244255c52718SAlan Stern if (status < 2) { 24431da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 24441da177e4SLinus Torvalds goto loop_disable; 24451da177e4SLinus Torvalds } 244655c52718SAlan Stern le16_to_cpus(&devstat); 24471da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 24481da177e4SLinus Torvalds dev_err(&udev->dev, 24491da177e4SLinus Torvalds "can't connect bus-powered hub " 24501da177e4SLinus Torvalds "to this port\n"); 24511da177e4SLinus Torvalds if (hub->has_indicators) { 24521da177e4SLinus Torvalds hub->indicator[port1-1] = 24531da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 24541da177e4SLinus Torvalds schedule_work (&hub->leds); 24551da177e4SLinus Torvalds } 24561da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 24571da177e4SLinus Torvalds goto loop_disable; 24581da177e4SLinus Torvalds } 24591da177e4SLinus Torvalds } 24601da177e4SLinus Torvalds 24611da177e4SLinus Torvalds /* check for devices running slower than they could */ 24621da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 24631da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 24641da177e4SLinus Torvalds && highspeed_hubs != 0) 24651da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 24661da177e4SLinus Torvalds 24671da177e4SLinus Torvalds /* Store the parent's children[] pointer. At this point 24681da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 24691da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 24701da177e4SLinus Torvalds */ 24711da177e4SLinus Torvalds status = 0; 24721da177e4SLinus Torvalds 24731da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 24741da177e4SLinus Torvalds * been disconnected; we would race with the 24751da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 24761da177e4SLinus Torvalds */ 24771da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 24781da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 24791da177e4SLinus Torvalds status = -ENOTCONN; 24801da177e4SLinus Torvalds else 24811da177e4SLinus Torvalds hdev->children[port1-1] = udev; 24821da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 24831da177e4SLinus Torvalds 24841da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 24851da177e4SLinus Torvalds if (!status) { 24861da177e4SLinus Torvalds status = usb_new_device(udev); 24871da177e4SLinus Torvalds if (status) { 24881da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 24891da177e4SLinus Torvalds hdev->children[port1-1] = NULL; 24901da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 24911da177e4SLinus Torvalds } 24921da177e4SLinus Torvalds } 24931da177e4SLinus Torvalds 24941da177e4SLinus Torvalds if (status) 24951da177e4SLinus Torvalds goto loop_disable; 24961da177e4SLinus Torvalds 24971da177e4SLinus Torvalds status = hub_power_remaining(hub); 24981da177e4SLinus Torvalds if (status) 249955c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 25001da177e4SLinus Torvalds 25011da177e4SLinus Torvalds return; 25021da177e4SLinus Torvalds 25031da177e4SLinus Torvalds loop_disable: 25041da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 25051da177e4SLinus Torvalds loop: 25061da177e4SLinus Torvalds ep0_reinit(udev); 25071da177e4SLinus Torvalds release_address(udev); 25081da177e4SLinus Torvalds usb_put_dev(udev); 25091da177e4SLinus Torvalds if (status == -ENOTCONN) 25101da177e4SLinus Torvalds break; 25111da177e4SLinus Torvalds } 25121da177e4SLinus Torvalds 25131da177e4SLinus Torvalds done: 25141da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 25151da177e4SLinus Torvalds } 25161da177e4SLinus Torvalds 25171da177e4SLinus Torvalds static void hub_events(void) 25181da177e4SLinus Torvalds { 25191da177e4SLinus Torvalds struct list_head *tmp; 25201da177e4SLinus Torvalds struct usb_device *hdev; 25211da177e4SLinus Torvalds struct usb_interface *intf; 25221da177e4SLinus Torvalds struct usb_hub *hub; 25231da177e4SLinus Torvalds struct device *hub_dev; 25241da177e4SLinus Torvalds u16 hubstatus; 25251da177e4SLinus Torvalds u16 hubchange; 25261da177e4SLinus Torvalds u16 portstatus; 25271da177e4SLinus Torvalds u16 portchange; 25281da177e4SLinus Torvalds int i, ret; 25291da177e4SLinus Torvalds int connect_change; 25301da177e4SLinus Torvalds 25311da177e4SLinus Torvalds /* 25321da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 25331da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 25341da177e4SLinus Torvalds * safe since we delete the hub from the event list. 25351da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 25361da177e4SLinus Torvalds */ 25371da177e4SLinus Torvalds while (1) { 25381da177e4SLinus Torvalds 25391da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 25401da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 25411da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 25421da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 25431da177e4SLinus Torvalds break; 25441da177e4SLinus Torvalds } 25451da177e4SLinus Torvalds 25461da177e4SLinus Torvalds tmp = hub_event_list.next; 25471da177e4SLinus Torvalds list_del_init(tmp); 25481da177e4SLinus Torvalds 25491da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 25501da177e4SLinus Torvalds hdev = hub->hdev; 25511da177e4SLinus Torvalds intf = to_usb_interface(hub->intfdev); 25521da177e4SLinus Torvalds hub_dev = &intf->dev; 25531da177e4SLinus Torvalds 2554979d5199SDavid Brownell i = hub->resume_root_hub; 2555979d5199SDavid Brownell 2556979d5199SDavid Brownell dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n", 25571da177e4SLinus Torvalds hdev->state, hub->descriptor 25581da177e4SLinus Torvalds ? hub->descriptor->bNbrPorts 25591da177e4SLinus Torvalds : 0, 25601da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 25611da177e4SLinus Torvalds (u16) hub->change_bits[0], 2562979d5199SDavid Brownell (u16) hub->event_bits[0], 2563979d5199SDavid Brownell i ? ", resume root" : ""); 25641da177e4SLinus Torvalds 25651da177e4SLinus Torvalds usb_get_intf(intf); 25661da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 25671da177e4SLinus Torvalds 25681da177e4SLinus Torvalds /* Lock the device, then check to see if we were 25691da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 25701da177e4SLinus Torvalds if (locktree(hdev) < 0) { 25711da177e4SLinus Torvalds usb_put_intf(intf); 25721da177e4SLinus Torvalds continue; 25731da177e4SLinus Torvalds } 25741da177e4SLinus Torvalds if (hub != usb_get_intfdata(intf)) 25751da177e4SLinus Torvalds goto loop; 25761da177e4SLinus Torvalds 25771da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 25781da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 25797de18d8bSAlan Stern hub->error = -ENODEV; 25807de18d8bSAlan Stern hub_pre_reset(intf); 25811da177e4SLinus Torvalds goto loop; 25821da177e4SLinus Torvalds } 25831da177e4SLinus Torvalds 2584a8e7c565SAlan Stern /* Is this is a root hub wanting to reactivate the downstream 2585a8e7c565SAlan Stern * ports? If so, be sure the interface resumes even if its 2586a8e7c565SAlan Stern * stub "device" node was never suspended. 2587a8e7c565SAlan Stern */ 2588a8e7c565SAlan Stern if (i) 2589645daaabSAlan Stern usb_autoresume_device(hdev, 0); 2590a8e7c565SAlan Stern 25911da177e4SLinus Torvalds /* If this is an inactive or suspended hub, do nothing */ 25921da177e4SLinus Torvalds if (hub->quiescing) 25931da177e4SLinus Torvalds goto loop; 25941da177e4SLinus Torvalds 25951da177e4SLinus Torvalds if (hub->error) { 25961da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 25971da177e4SLinus Torvalds hub->error); 25981da177e4SLinus Torvalds 25997de18d8bSAlan Stern ret = usb_reset_composite_device(hdev, intf); 26001da177e4SLinus Torvalds if (ret) { 26011da177e4SLinus Torvalds dev_dbg (hub_dev, 26021da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 26031da177e4SLinus Torvalds goto loop; 26041da177e4SLinus Torvalds } 26051da177e4SLinus Torvalds 26061da177e4SLinus Torvalds hub->nerrors = 0; 26071da177e4SLinus Torvalds hub->error = 0; 26081da177e4SLinus Torvalds } 26091da177e4SLinus Torvalds 26101da177e4SLinus Torvalds /* deal with port status changes */ 26111da177e4SLinus Torvalds for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { 26121da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 26131da177e4SLinus Torvalds continue; 26141da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 26151da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 26161da177e4SLinus Torvalds !connect_change && !hub->activating) 26171da177e4SLinus Torvalds continue; 26181da177e4SLinus Torvalds 26191da177e4SLinus Torvalds ret = hub_port_status(hub, i, 26201da177e4SLinus Torvalds &portstatus, &portchange); 26211da177e4SLinus Torvalds if (ret < 0) 26221da177e4SLinus Torvalds continue; 26231da177e4SLinus Torvalds 26241da177e4SLinus Torvalds if (hub->activating && !hdev->children[i-1] && 26251da177e4SLinus Torvalds (portstatus & 26261da177e4SLinus Torvalds USB_PORT_STAT_CONNECTION)) 26271da177e4SLinus Torvalds connect_change = 1; 26281da177e4SLinus Torvalds 26291da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 26301da177e4SLinus Torvalds clear_port_feature(hdev, i, 26311da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 26321da177e4SLinus Torvalds connect_change = 1; 26331da177e4SLinus Torvalds } 26341da177e4SLinus Torvalds 26351da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 26361da177e4SLinus Torvalds if (!connect_change) 26371da177e4SLinus Torvalds dev_dbg (hub_dev, 26381da177e4SLinus Torvalds "port %d enable change, " 26391da177e4SLinus Torvalds "status %08x\n", 26401da177e4SLinus Torvalds i, portstatus); 26411da177e4SLinus Torvalds clear_port_feature(hdev, i, 26421da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 26431da177e4SLinus Torvalds 26441da177e4SLinus Torvalds /* 26451da177e4SLinus Torvalds * EM interference sometimes causes badly 26461da177e4SLinus Torvalds * shielded USB devices to be shutdown by 26471da177e4SLinus Torvalds * the hub, this hack enables them again. 26481da177e4SLinus Torvalds * Works at least with mouse driver. 26491da177e4SLinus Torvalds */ 26501da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 26511da177e4SLinus Torvalds && !connect_change 26521da177e4SLinus Torvalds && hdev->children[i-1]) { 26531da177e4SLinus Torvalds dev_err (hub_dev, 26541da177e4SLinus Torvalds "port %i " 26551da177e4SLinus Torvalds "disabled by hub (EMI?), " 26561da177e4SLinus Torvalds "re-enabling...\n", 26571da177e4SLinus Torvalds i); 26581da177e4SLinus Torvalds connect_change = 1; 26591da177e4SLinus Torvalds } 26601da177e4SLinus Torvalds } 26611da177e4SLinus Torvalds 26621da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_SUSPEND) { 26631da177e4SLinus Torvalds clear_port_feature(hdev, i, 26641da177e4SLinus Torvalds USB_PORT_FEAT_C_SUSPEND); 26651da177e4SLinus Torvalds if (hdev->children[i-1]) { 26661da177e4SLinus Torvalds ret = remote_wakeup(hdev-> 26671da177e4SLinus Torvalds children[i-1]); 26681da177e4SLinus Torvalds if (ret < 0) 26691da177e4SLinus Torvalds connect_change = 1; 26701da177e4SLinus Torvalds } else { 26711da177e4SLinus Torvalds ret = -ENODEV; 26721da177e4SLinus Torvalds hub_port_disable(hub, i, 1); 26731da177e4SLinus Torvalds } 26741da177e4SLinus Torvalds dev_dbg (hub_dev, 26751da177e4SLinus Torvalds "resume on port %d, status %d\n", 26761da177e4SLinus Torvalds i, ret); 26771da177e4SLinus Torvalds } 26781da177e4SLinus Torvalds 26791da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 26801da177e4SLinus Torvalds dev_err (hub_dev, 26811da177e4SLinus Torvalds "over-current change on port %d\n", 26821da177e4SLinus Torvalds i); 26831da177e4SLinus Torvalds clear_port_feature(hdev, i, 26841da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 26851da177e4SLinus Torvalds hub_power_on(hub); 26861da177e4SLinus Torvalds } 26871da177e4SLinus Torvalds 26881da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 26891da177e4SLinus Torvalds dev_dbg (hub_dev, 26901da177e4SLinus Torvalds "reset change on port %d\n", 26911da177e4SLinus Torvalds i); 26921da177e4SLinus Torvalds clear_port_feature(hdev, i, 26931da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 26941da177e4SLinus Torvalds } 26951da177e4SLinus Torvalds 26961da177e4SLinus Torvalds if (connect_change) 26971da177e4SLinus Torvalds hub_port_connect_change(hub, i, 26981da177e4SLinus Torvalds portstatus, portchange); 26991da177e4SLinus Torvalds } /* end for i */ 27001da177e4SLinus Torvalds 27011da177e4SLinus Torvalds /* deal with hub status changes */ 27021da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 27031da177e4SLinus Torvalds ; /* do nothing */ 27041da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 27051da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 27061da177e4SLinus Torvalds else { 27071da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 27081da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 27091da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 271055c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 271155c52718SAlan Stern /* FIXME: Is this always true? */ 271255c52718SAlan Stern hub->limited_power = 0; 271355c52718SAlan Stern else 271455c52718SAlan Stern hub->limited_power = 1; 27151da177e4SLinus Torvalds } 27161da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 27171da177e4SLinus Torvalds dev_dbg (hub_dev, "overcurrent change\n"); 27181da177e4SLinus Torvalds msleep(500); /* Cool down */ 27191da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 27201da177e4SLinus Torvalds hub_power_on(hub); 27211da177e4SLinus Torvalds } 27221da177e4SLinus Torvalds } 27231da177e4SLinus Torvalds 27241da177e4SLinus Torvalds hub->activating = 0; 27251da177e4SLinus Torvalds 2726d5926ae7SAlan Stern /* If this is a root hub, tell the HCD it's okay to 2727d5926ae7SAlan Stern * re-enable port-change interrupts now. */ 2728d5cbad4bSAlan Stern if (!hdev->parent && !hub->busy_bits[0]) 2729d5926ae7SAlan Stern usb_enable_root_hub_irq(hdev->bus); 2730d5926ae7SAlan Stern 27311da177e4SLinus Torvalds loop: 27321da177e4SLinus Torvalds usb_unlock_device(hdev); 27331da177e4SLinus Torvalds usb_put_intf(intf); 27341da177e4SLinus Torvalds 27351da177e4SLinus Torvalds } /* end while (1) */ 27361da177e4SLinus Torvalds } 27371da177e4SLinus Torvalds 27381da177e4SLinus Torvalds static int hub_thread(void *__unused) 27391da177e4SLinus Torvalds { 27401da177e4SLinus Torvalds do { 27411da177e4SLinus Torvalds hub_events(); 27429c8d6178Sakpm@osdl.org wait_event_interruptible(khubd_wait, 27439c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 27449c8d6178Sakpm@osdl.org kthread_should_stop()); 27453e1d1d28SChristoph Lameter try_to_freeze(); 27469c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 27471da177e4SLinus Torvalds 27481da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 27499c8d6178Sakpm@osdl.org return 0; 27501da177e4SLinus Torvalds } 27511da177e4SLinus Torvalds 27521da177e4SLinus Torvalds static struct usb_device_id hub_id_table [] = { 27531da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 27541da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 27551da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 27561da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 27571da177e4SLinus Torvalds { } /* Terminating entry */ 27581da177e4SLinus Torvalds }; 27591da177e4SLinus Torvalds 27601da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 27611da177e4SLinus Torvalds 27621da177e4SLinus Torvalds static struct usb_driver hub_driver = { 27631da177e4SLinus Torvalds .name = "hub", 27641da177e4SLinus Torvalds .probe = hub_probe, 27651da177e4SLinus Torvalds .disconnect = hub_disconnect, 27661da177e4SLinus Torvalds .suspend = hub_suspend, 27671da177e4SLinus Torvalds .resume = hub_resume, 27687de18d8bSAlan Stern .pre_reset = hub_pre_reset, 27697de18d8bSAlan Stern .post_reset = hub_post_reset, 27701da177e4SLinus Torvalds .ioctl = hub_ioctl, 27711da177e4SLinus Torvalds .id_table = hub_id_table, 27721da177e4SLinus Torvalds }; 27731da177e4SLinus Torvalds 27741da177e4SLinus Torvalds int usb_hub_init(void) 27751da177e4SLinus Torvalds { 27761da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 27771da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 27781da177e4SLinus Torvalds usbcore_name); 27791da177e4SLinus Torvalds return -1; 27801da177e4SLinus Torvalds } 27811da177e4SLinus Torvalds 27829c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 27839c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 27841da177e4SLinus Torvalds return 0; 27851da177e4SLinus Torvalds 27861da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 27871da177e4SLinus Torvalds usb_deregister(&hub_driver); 27881da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 27891da177e4SLinus Torvalds 27901da177e4SLinus Torvalds return -1; 27911da177e4SLinus Torvalds } 27921da177e4SLinus Torvalds 27931da177e4SLinus Torvalds void usb_hub_cleanup(void) 27941da177e4SLinus Torvalds { 27959c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 27961da177e4SLinus Torvalds 27971da177e4SLinus Torvalds /* 27981da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 27991da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 28001da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 28011da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 28021da177e4SLinus Torvalds * individual hub resources. -greg 28031da177e4SLinus Torvalds */ 28041da177e4SLinus Torvalds usb_deregister(&hub_driver); 28051da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 28061da177e4SLinus Torvalds 28071da177e4SLinus Torvalds static int config_descriptors_changed(struct usb_device *udev) 28081da177e4SLinus Torvalds { 28091da177e4SLinus Torvalds unsigned index; 28101da177e4SLinus Torvalds unsigned len = 0; 28111da177e4SLinus Torvalds struct usb_config_descriptor *buf; 28121da177e4SLinus Torvalds 28131da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 28141da177e4SLinus Torvalds if (len < le16_to_cpu(udev->config[index].desc.wTotalLength)) 28151da177e4SLinus Torvalds len = le16_to_cpu(udev->config[index].desc.wTotalLength); 28161da177e4SLinus Torvalds } 28171da177e4SLinus Torvalds buf = kmalloc (len, SLAB_KERNEL); 28181da177e4SLinus Torvalds if (buf == NULL) { 28191da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 28201da177e4SLinus Torvalds /* assume the worst */ 28211da177e4SLinus Torvalds return 1; 28221da177e4SLinus Torvalds } 28231da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 28241da177e4SLinus Torvalds int length; 28251da177e4SLinus Torvalds int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 28261da177e4SLinus Torvalds 28271da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 28281da177e4SLinus Torvalds old_length); 28291da177e4SLinus Torvalds if (length < old_length) { 28301da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 28311da177e4SLinus Torvalds index, length); 28321da177e4SLinus Torvalds break; 28331da177e4SLinus Torvalds } 28341da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 28351da177e4SLinus Torvalds != 0) { 28361da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 28371da177e4SLinus Torvalds index, buf->bConfigurationValue); 28381da177e4SLinus Torvalds break; 28391da177e4SLinus Torvalds } 28401da177e4SLinus Torvalds } 28411da177e4SLinus Torvalds kfree(buf); 28421da177e4SLinus Torvalds return index != udev->descriptor.bNumConfigurations; 28431da177e4SLinus Torvalds } 28441da177e4SLinus Torvalds 28451da177e4SLinus Torvalds /** 28461da177e4SLinus Torvalds * usb_reset_device - perform a USB port reset to reinitialize a device 28471da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 28481da177e4SLinus Torvalds * 284979efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 285079efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 285179efa097SAlan Stern * Use usb_reset_composite_device() instead. 28521da177e4SLinus Torvalds * 28531da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 28541da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 28551da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 28561da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 28571da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 28581da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 28591da177e4SLinus Torvalds * re-enumerated and probed all over again. 28601da177e4SLinus Torvalds * 28611da177e4SLinus Torvalds * Returns 0 if the reset succeeded, -ENODEV if the device has been 28621da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 28631da177e4SLinus Torvalds * if the reset wasn't even attempted. 28641da177e4SLinus Torvalds * 28651da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 28661da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 28671da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 28681da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 28691da177e4SLinus Torvalds */ 28701da177e4SLinus Torvalds int usb_reset_device(struct usb_device *udev) 28711da177e4SLinus Torvalds { 28721da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 28731da177e4SLinus Torvalds struct usb_hub *parent_hub; 28741da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 287512c3da34SAlan Stern int i, ret = 0; 287612c3da34SAlan Stern int port1 = udev->portnum; 28771da177e4SLinus Torvalds 28781da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 28791da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 28801da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 28811da177e4SLinus Torvalds udev->state); 28821da177e4SLinus Torvalds return -EINVAL; 28831da177e4SLinus Torvalds } 28841da177e4SLinus Torvalds 28851da177e4SLinus Torvalds if (!parent_hdev) { 28861da177e4SLinus Torvalds /* this requires hcd-specific logic; see OHCI hc_restart() */ 28871da177e4SLinus Torvalds dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__); 28881da177e4SLinus Torvalds return -EISDIR; 28891da177e4SLinus Torvalds } 28901da177e4SLinus Torvalds parent_hub = hdev_to_hub(parent_hdev); 28911da177e4SLinus Torvalds 28921da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 28931da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 28941da177e4SLinus Torvalds 28951da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 28961da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 28971da177e4SLinus Torvalds ep0_reinit(udev); 28981da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 28991da177e4SLinus Torvalds if (ret >= 0) 29001da177e4SLinus Torvalds break; 29011da177e4SLinus Torvalds } 29021da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 2903d5cbad4bSAlan Stern if (!parent_hdev->parent && !parent_hub->busy_bits[0]) 2904d5cbad4bSAlan Stern usb_enable_root_hub_irq(parent_hdev->bus); 2905d5cbad4bSAlan Stern 29061da177e4SLinus Torvalds if (ret < 0) 29071da177e4SLinus Torvalds goto re_enumerate; 29081da177e4SLinus Torvalds 29091da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 29101da177e4SLinus Torvalds if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor) 29111da177e4SLinus Torvalds || config_descriptors_changed (udev)) { 29121da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 29131da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 29141da177e4SLinus Torvalds goto re_enumerate; 29151da177e4SLinus Torvalds } 29161da177e4SLinus Torvalds 29171da177e4SLinus Torvalds if (!udev->actconfig) 29181da177e4SLinus Torvalds goto done; 29191da177e4SLinus Torvalds 29201da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 29211da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 29221da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 29231da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 29241da177e4SLinus Torvalds if (ret < 0) { 29251da177e4SLinus Torvalds dev_err(&udev->dev, 29261da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 29271da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 29281da177e4SLinus Torvalds goto re_enumerate; 29291da177e4SLinus Torvalds } 29301da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 29311da177e4SLinus Torvalds 29321da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 29331da177e4SLinus Torvalds struct usb_interface *intf = udev->actconfig->interface[i]; 29341da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 29351da177e4SLinus Torvalds 29361da177e4SLinus Torvalds /* set_interface resets host side toggle even 29371da177e4SLinus Torvalds * for altsetting zero. the interface may have no driver. 29381da177e4SLinus Torvalds */ 29391da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 29401da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 29411da177e4SLinus Torvalds desc->bAlternateSetting); 29421da177e4SLinus Torvalds if (ret < 0) { 29431da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 29441da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 29451da177e4SLinus Torvalds desc->bInterfaceNumber, 29461da177e4SLinus Torvalds desc->bAlternateSetting, 29471da177e4SLinus Torvalds ret); 29481da177e4SLinus Torvalds goto re_enumerate; 29491da177e4SLinus Torvalds } 29501da177e4SLinus Torvalds } 29511da177e4SLinus Torvalds 29521da177e4SLinus Torvalds done: 29531da177e4SLinus Torvalds return 0; 29541da177e4SLinus Torvalds 29551da177e4SLinus Torvalds re_enumerate: 29561da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 29571da177e4SLinus Torvalds return -ENODEV; 29581da177e4SLinus Torvalds } 2959140d8f68SAlan Stern EXPORT_SYMBOL(usb_reset_device); 296079efa097SAlan Stern 296179efa097SAlan Stern /** 296279efa097SAlan Stern * usb_reset_composite_device - warn interface drivers and perform a USB port reset 296379efa097SAlan Stern * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 296479efa097SAlan Stern * @iface: interface bound to the driver making the request (optional) 296579efa097SAlan Stern * 296679efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 296779efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 296879efa097SAlan Stern * the reset is over (using their post_reset method). 296979efa097SAlan Stern * 297079efa097SAlan Stern * Return value is the same as for usb_reset_device(). 297179efa097SAlan Stern * 297279efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 297379efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 297479efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 297579efa097SAlan Stern * the device using usb_lock_device_for_reset(). 297679efa097SAlan Stern * 297779efa097SAlan Stern * The interface locks are acquired during the pre_reset stage and released 297879efa097SAlan Stern * during the post_reset stage. However if iface is not NULL and is 297979efa097SAlan Stern * currently being probed, we assume that the caller already owns its 298079efa097SAlan Stern * lock. 298179efa097SAlan Stern */ 298279efa097SAlan Stern int usb_reset_composite_device(struct usb_device *udev, 298379efa097SAlan Stern struct usb_interface *iface) 298479efa097SAlan Stern { 298579efa097SAlan Stern int ret; 298679efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 298779efa097SAlan Stern 298879efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 298979efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 299079efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 299179efa097SAlan Stern udev->state); 299279efa097SAlan Stern return -EINVAL; 299379efa097SAlan Stern } 299479efa097SAlan Stern 2995645daaabSAlan Stern /* Prevent autosuspend during the reset */ 2996645daaabSAlan Stern usb_autoresume_device(udev, 1); 2997645daaabSAlan Stern 299879efa097SAlan Stern if (iface && iface->condition != USB_INTERFACE_BINDING) 299979efa097SAlan Stern iface = NULL; 300079efa097SAlan Stern 300179efa097SAlan Stern if (config) { 300279efa097SAlan Stern int i; 300379efa097SAlan Stern struct usb_interface *cintf; 300479efa097SAlan Stern struct usb_driver *drv; 300579efa097SAlan Stern 300679efa097SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 300779efa097SAlan Stern cintf = config->interface[i]; 300879efa097SAlan Stern if (cintf != iface) 300979efa097SAlan Stern down(&cintf->dev.sem); 301079efa097SAlan Stern if (device_is_registered(&cintf->dev) && 301179efa097SAlan Stern cintf->dev.driver) { 301279efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 301379efa097SAlan Stern if (drv->pre_reset) 301479efa097SAlan Stern (drv->pre_reset)(cintf); 301579efa097SAlan Stern } 301679efa097SAlan Stern } 301779efa097SAlan Stern } 301879efa097SAlan Stern 301979efa097SAlan Stern ret = usb_reset_device(udev); 302079efa097SAlan Stern 302179efa097SAlan Stern if (config) { 302279efa097SAlan Stern int i; 302379efa097SAlan Stern struct usb_interface *cintf; 302479efa097SAlan Stern struct usb_driver *drv; 302579efa097SAlan Stern 302679efa097SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 302779efa097SAlan Stern cintf = config->interface[i]; 302879efa097SAlan Stern if (device_is_registered(&cintf->dev) && 302979efa097SAlan Stern cintf->dev.driver) { 303079efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 303179efa097SAlan Stern if (drv->post_reset) 303279efa097SAlan Stern (drv->post_reset)(cintf); 303379efa097SAlan Stern } 303479efa097SAlan Stern if (cintf != iface) 303579efa097SAlan Stern up(&cintf->dev.sem); 303679efa097SAlan Stern } 303779efa097SAlan Stern } 303879efa097SAlan Stern 3039645daaabSAlan Stern usb_autosuspend_device(udev, 1); 304079efa097SAlan Stern return ret; 304179efa097SAlan Stern } 3042140d8f68SAlan Stern EXPORT_SYMBOL(usb_reset_composite_device); 3043