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/config.h> 121da177e4SLinus Torvalds #ifdef CONFIG_USB_DEBUG 131da177e4SLinus Torvalds #define DEBUG 141da177e4SLinus Torvalds #else 151da177e4SLinus Torvalds #undef DEBUG 161da177e4SLinus Torvalds #endif 171da177e4SLinus Torvalds #include <linux/kernel.h> 181da177e4SLinus Torvalds #include <linux/errno.h> 191da177e4SLinus Torvalds #include <linux/module.h> 201da177e4SLinus Torvalds #include <linux/moduleparam.h> 211da177e4SLinus Torvalds #include <linux/completion.h> 221da177e4SLinus Torvalds #include <linux/sched.h> 231da177e4SLinus Torvalds #include <linux/list.h> 241da177e4SLinus Torvalds #include <linux/slab.h> 251da177e4SLinus Torvalds #include <linux/smp_lock.h> 261da177e4SLinus Torvalds #include <linux/ioctl.h> 271da177e4SLinus Torvalds #include <linux/usb.h> 281da177e4SLinus Torvalds #include <linux/usbdevice_fs.h> 299c8d6178Sakpm@osdl.org #include <linux/kthread.h> 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #include <asm/semaphore.h> 321da177e4SLinus Torvalds #include <asm/uaccess.h> 331da177e4SLinus Torvalds #include <asm/byteorder.h> 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds #include "usb.h" 361da177e4SLinus Torvalds #include "hcd.h" 371da177e4SLinus Torvalds #include "hub.h" 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds /* Protect struct usb_device->state and ->children members 401da177e4SLinus Torvalds * Note: Both are also protected by ->serialize, except that ->state can 411da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 421da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds /* khubd's worklist and its lock */ 451da177e4SLinus Torvalds static DEFINE_SPINLOCK(hub_event_lock); 461da177e4SLinus Torvalds static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds /* Wakes up khubd */ 491da177e4SLinus Torvalds static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); 501da177e4SLinus Torvalds 519c8d6178Sakpm@osdl.org static struct task_struct *khubd_task; 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 541da177e4SLinus Torvalds static int blinkenlights = 0; 551da177e4SLinus Torvalds module_param (blinkenlights, bool, S_IRUGO); 561da177e4SLinus Torvalds MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds /* 591da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 601da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 611da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 621da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 631da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 641da177e4SLinus Torvalds * following module parameters. 651da177e4SLinus Torvalds * 661da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 671da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 681da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 691da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 701da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 711da177e4SLinus Torvalds */ 721da177e4SLinus Torvalds static int old_scheme_first = 0; 731da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 741da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 751da177e4SLinus Torvalds "start with the old device initialization scheme"); 761da177e4SLinus Torvalds 771da177e4SLinus Torvalds static int use_both_schemes = 1; 781da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 791da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 801da177e4SLinus Torvalds "try the other device initialization scheme if the " 811da177e4SLinus Torvalds "first one fails"); 821da177e4SLinus Torvalds 831da177e4SLinus Torvalds 841da177e4SLinus Torvalds #ifdef DEBUG 851da177e4SLinus Torvalds static inline char *portspeed (int portstatus) 861da177e4SLinus Torvalds { 871da177e4SLinus Torvalds if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) 881da177e4SLinus Torvalds return "480 Mb/s"; 891da177e4SLinus Torvalds else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) 901da177e4SLinus Torvalds return "1.5 Mb/s"; 911da177e4SLinus Torvalds else 921da177e4SLinus Torvalds return "12 Mb/s"; 931da177e4SLinus Torvalds } 941da177e4SLinus Torvalds #endif 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 971da177e4SLinus Torvalds static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev) 981da177e4SLinus Torvalds { 991da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1001da177e4SLinus Torvalds } 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 1031da177e4SLinus Torvalds static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) 1041da177e4SLinus Torvalds { 1051da177e4SLinus Torvalds int i, ret; 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 1081da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 1091da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 1101da177e4SLinus Torvalds USB_DT_HUB << 8, 0, data, size, 1111da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 1121da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 1131da177e4SLinus Torvalds return ret; 1141da177e4SLinus Torvalds } 1151da177e4SLinus Torvalds return -EINVAL; 1161da177e4SLinus Torvalds } 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds /* 1191da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 1201da177e4SLinus Torvalds */ 1211da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 1221da177e4SLinus Torvalds { 1231da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1241da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 1251da177e4SLinus Torvalds } 1261da177e4SLinus Torvalds 1271da177e4SLinus Torvalds /* 1281da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 1291da177e4SLinus Torvalds */ 1301da177e4SLinus Torvalds static int clear_port_feature(struct usb_device *hdev, int port1, int feature) 1311da177e4SLinus Torvalds { 1321da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1331da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 1341da177e4SLinus Torvalds NULL, 0, 1000); 1351da177e4SLinus Torvalds } 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds /* 1381da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 1391da177e4SLinus Torvalds */ 1401da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 1411da177e4SLinus Torvalds { 1421da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1431da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 1441da177e4SLinus Torvalds NULL, 0, 1000); 1451da177e4SLinus Torvalds } 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds /* 1481da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 1491da177e4SLinus Torvalds * for info about using port indicators 1501da177e4SLinus Torvalds */ 1511da177e4SLinus Torvalds static void set_port_led( 1521da177e4SLinus Torvalds struct usb_hub *hub, 1531da177e4SLinus Torvalds int port1, 1541da177e4SLinus Torvalds int selector 1551da177e4SLinus Torvalds ) 1561da177e4SLinus Torvalds { 1571da177e4SLinus Torvalds int status = set_port_feature(hub->hdev, (selector << 8) | port1, 1581da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 1591da177e4SLinus Torvalds if (status < 0) 1601da177e4SLinus Torvalds dev_dbg (hub->intfdev, 1611da177e4SLinus Torvalds "port %d indicator %s status %d\n", 1621da177e4SLinus Torvalds port1, 1631da177e4SLinus Torvalds ({ char *s; switch (selector) { 1641da177e4SLinus Torvalds case HUB_LED_AMBER: s = "amber"; break; 1651da177e4SLinus Torvalds case HUB_LED_GREEN: s = "green"; break; 1661da177e4SLinus Torvalds case HUB_LED_OFF: s = "off"; break; 1671da177e4SLinus Torvalds case HUB_LED_AUTO: s = "auto"; break; 1681da177e4SLinus Torvalds default: s = "??"; break; 1691da177e4SLinus Torvalds }; s; }), 1701da177e4SLinus Torvalds status); 1711da177e4SLinus Torvalds } 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds static void led_work (void *__hub) 1761da177e4SLinus Torvalds { 1771da177e4SLinus Torvalds struct usb_hub *hub = __hub; 1781da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 1791da177e4SLinus Torvalds unsigned i; 1801da177e4SLinus Torvalds unsigned changed = 0; 1811da177e4SLinus Torvalds int cursor = -1; 1821da177e4SLinus Torvalds 1831da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 1841da177e4SLinus Torvalds return; 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds for (i = 0; i < hub->descriptor->bNbrPorts; i++) { 1871da177e4SLinus Torvalds unsigned selector, mode; 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds /* 30%-50% duty cycle */ 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds switch (hub->indicator[i]) { 1921da177e4SLinus Torvalds /* cycle marker */ 1931da177e4SLinus Torvalds case INDICATOR_CYCLE: 1941da177e4SLinus Torvalds cursor = i; 1951da177e4SLinus Torvalds selector = HUB_LED_AUTO; 1961da177e4SLinus Torvalds mode = INDICATOR_AUTO; 1971da177e4SLinus Torvalds break; 1981da177e4SLinus Torvalds /* blinking green = sw attention */ 1991da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 2001da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2011da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 2021da177e4SLinus Torvalds break; 2031da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 2041da177e4SLinus Torvalds selector = HUB_LED_OFF; 2051da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 2061da177e4SLinus Torvalds break; 2071da177e4SLinus Torvalds /* blinking amber = hw attention */ 2081da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 2091da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2101da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 2111da177e4SLinus Torvalds break; 2121da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 2131da177e4SLinus Torvalds selector = HUB_LED_OFF; 2141da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 2151da177e4SLinus Torvalds break; 2161da177e4SLinus Torvalds /* blink green/amber = reserved */ 2171da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 2181da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2191da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 2201da177e4SLinus Torvalds break; 2211da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 2221da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2231da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 2241da177e4SLinus Torvalds break; 2251da177e4SLinus Torvalds default: 2261da177e4SLinus Torvalds continue; 2271da177e4SLinus Torvalds } 2281da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 2291da177e4SLinus Torvalds changed = 1; 2301da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 2311da177e4SLinus Torvalds hub->indicator[i] = mode; 2321da177e4SLinus Torvalds } 2331da177e4SLinus Torvalds if (!changed && blinkenlights) { 2341da177e4SLinus Torvalds cursor++; 2351da177e4SLinus Torvalds cursor %= hub->descriptor->bNbrPorts; 2361da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 2371da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 2381da177e4SLinus Torvalds changed++; 2391da177e4SLinus Torvalds } 2401da177e4SLinus Torvalds if (changed) 2411da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 2421da177e4SLinus Torvalds } 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 2451da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 2461da177e4SLinus Torvalds #define USB_STS_RETRIES 5 2471da177e4SLinus Torvalds 2481da177e4SLinus Torvalds /* 2491da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 2501da177e4SLinus Torvalds */ 2511da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 2521da177e4SLinus Torvalds struct usb_hub_status *data) 2531da177e4SLinus Torvalds { 2541da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 2551da177e4SLinus Torvalds 2561da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 2571da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 2581da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 2591da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds return status; 2621da177e4SLinus Torvalds } 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds /* 2651da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 2661da177e4SLinus Torvalds */ 2671da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 2681da177e4SLinus Torvalds struct usb_port_status *data) 2691da177e4SLinus Torvalds { 2701da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 2731da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 2741da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 2751da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 2761da177e4SLinus Torvalds } 2771da177e4SLinus Torvalds return status; 2781da177e4SLinus Torvalds } 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds static void kick_khubd(struct usb_hub *hub) 2811da177e4SLinus Torvalds { 2821da177e4SLinus Torvalds unsigned long flags; 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds spin_lock_irqsave(&hub_event_lock, flags); 2851da177e4SLinus Torvalds if (list_empty(&hub->event_list)) { 2861da177e4SLinus Torvalds list_add_tail(&hub->event_list, &hub_event_list); 2871da177e4SLinus Torvalds wake_up(&khubd_wait); 2881da177e4SLinus Torvalds } 2891da177e4SLinus Torvalds spin_unlock_irqrestore(&hub_event_lock, flags); 2901da177e4SLinus Torvalds } 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds void usb_kick_khubd(struct usb_device *hdev) 2931da177e4SLinus Torvalds { 2941da177e4SLinus Torvalds kick_khubd(hdev_to_hub(hdev)); 2951da177e4SLinus Torvalds } 2961da177e4SLinus Torvalds 2971da177e4SLinus Torvalds 2981da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 2991da177e4SLinus Torvalds static void hub_irq(struct urb *urb, struct pt_regs *regs) 3001da177e4SLinus Torvalds { 3011da177e4SLinus Torvalds struct usb_hub *hub = (struct usb_hub *)urb->context; 3021da177e4SLinus Torvalds int status; 3031da177e4SLinus Torvalds int i; 3041da177e4SLinus Torvalds unsigned long bits; 3051da177e4SLinus Torvalds 3061da177e4SLinus Torvalds switch (urb->status) { 3071da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 3081da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 3091da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 3101da177e4SLinus Torvalds return; 3111da177e4SLinus Torvalds 3121da177e4SLinus Torvalds default: /* presumably an error */ 3131da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 3141da177e4SLinus Torvalds dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status); 3151da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 3161da177e4SLinus Torvalds goto resubmit; 3171da177e4SLinus Torvalds hub->error = urb->status; 3181da177e4SLinus Torvalds /* FALL THROUGH */ 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds /* let khubd handle things */ 3211da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 3221da177e4SLinus Torvalds bits = 0; 3231da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 3241da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 3251da177e4SLinus Torvalds << (i*8); 3261da177e4SLinus Torvalds hub->event_bits[0] = bits; 3271da177e4SLinus Torvalds break; 3281da177e4SLinus Torvalds } 3291da177e4SLinus Torvalds 3301da177e4SLinus Torvalds hub->nerrors = 0; 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds /* Something happened, let khubd figure it out */ 3331da177e4SLinus Torvalds kick_khubd(hub); 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds resubmit: 3361da177e4SLinus Torvalds if (hub->quiescing) 3371da177e4SLinus Torvalds return; 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 3401da177e4SLinus Torvalds && status != -ENODEV && status != -EPERM) 3411da177e4SLinus Torvalds dev_err (hub->intfdev, "resubmit --> %d\n", status); 3421da177e4SLinus Torvalds } 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 3451da177e4SLinus Torvalds static inline int 3461da177e4SLinus Torvalds hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) 3471da177e4SLinus Torvalds { 3481da177e4SLinus Torvalds return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3491da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 3501da177e4SLinus Torvalds tt, NULL, 0, 1000); 3511da177e4SLinus Torvalds } 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds /* 3541da177e4SLinus Torvalds * enumeration blocks khubd for a long time. we use keventd instead, since 3551da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 3561da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 3571da177e4SLinus Torvalds * both can talk to the same hub concurrently. 3581da177e4SLinus Torvalds */ 3591da177e4SLinus Torvalds static void hub_tt_kevent (void *arg) 3601da177e4SLinus Torvalds { 3611da177e4SLinus Torvalds struct usb_hub *hub = arg; 3621da177e4SLinus Torvalds unsigned long flags; 3631da177e4SLinus Torvalds 3641da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 3651da177e4SLinus Torvalds while (!list_empty (&hub->tt.clear_list)) { 3661da177e4SLinus Torvalds struct list_head *temp; 3671da177e4SLinus Torvalds struct usb_tt_clear *clear; 3681da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 3691da177e4SLinus Torvalds int status; 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds temp = hub->tt.clear_list.next; 3721da177e4SLinus Torvalds clear = list_entry (temp, struct usb_tt_clear, clear_list); 3731da177e4SLinus Torvalds list_del (&clear->clear_list); 3741da177e4SLinus Torvalds 3751da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 3761da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 3771da177e4SLinus Torvalds status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 3781da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 3791da177e4SLinus Torvalds 3801da177e4SLinus Torvalds if (status) 3811da177e4SLinus Torvalds dev_err (&hdev->dev, 3821da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 3831da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 3841da177e4SLinus Torvalds kfree(clear); 3851da177e4SLinus Torvalds } 3861da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 3871da177e4SLinus Torvalds } 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds /** 3901da177e4SLinus Torvalds * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub 3911da177e4SLinus Torvalds * @udev: the device whose split transaction failed 3921da177e4SLinus Torvalds * @pipe: identifies the endpoint of the failed transaction 3931da177e4SLinus Torvalds * 3941da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 3951da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 3961da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 3971da177e4SLinus Torvalds * interrupt context. 3981da177e4SLinus Torvalds * 3991da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 4001da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 4011da177e4SLinus Torvalds */ 4021da177e4SLinus Torvalds void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe) 4031da177e4SLinus Torvalds { 4041da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 4051da177e4SLinus Torvalds unsigned long flags; 4061da177e4SLinus Torvalds struct usb_tt_clear *clear; 4071da177e4SLinus Torvalds 4081da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 4091da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 4101da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 4111da177e4SLinus Torvalds */ 4121da177e4SLinus Torvalds if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == NULL) { 4131da177e4SLinus Torvalds dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 4141da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 4151da177e4SLinus Torvalds return; 4161da177e4SLinus Torvalds } 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 4191da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 4201da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 4211da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 4221da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol (pipe) 4231da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 4241da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 4251da177e4SLinus Torvalds if (usb_pipein (pipe)) 4261da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 4271da177e4SLinus Torvalds 4281da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 4291da177e4SLinus Torvalds spin_lock_irqsave (&tt->lock, flags); 4301da177e4SLinus Torvalds list_add_tail (&clear->clear_list, &tt->clear_list); 4311da177e4SLinus Torvalds schedule_work (&tt->kevent); 4321da177e4SLinus Torvalds spin_unlock_irqrestore (&tt->lock, flags); 4331da177e4SLinus Torvalds } 4341da177e4SLinus Torvalds 4351da177e4SLinus Torvalds static void hub_power_on(struct usb_hub *hub) 4361da177e4SLinus Torvalds { 4371da177e4SLinus Torvalds int port1; 438b789696aSDavid Brownell unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 43974ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 4401da177e4SLinus Torvalds 4411da177e4SLinus Torvalds /* if hub supports power switching, enable power on each port */ 44274ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) { 4431da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 4441da177e4SLinus Torvalds for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) 4451da177e4SLinus Torvalds set_port_feature(hub->hdev, port1, 4461da177e4SLinus Torvalds USB_PORT_FEAT_POWER); 4471da177e4SLinus Torvalds } 4481da177e4SLinus Torvalds 449b789696aSDavid Brownell /* Wait at least 100 msec for power to become stable */ 450b789696aSDavid Brownell msleep(max(pgood_delay, (unsigned) 100)); 4511da177e4SLinus Torvalds } 4521da177e4SLinus Torvalds 453979d5199SDavid Brownell static inline void __hub_quiesce(struct usb_hub *hub) 4541da177e4SLinus Torvalds { 455979d5199SDavid Brownell /* (nonblocking) khubd and related activity won't re-trigger */ 4561da177e4SLinus Torvalds hub->quiescing = 1; 457c9f89fa4SDavid Brownell hub->activating = 0; 458979d5199SDavid Brownell hub->resume_root_hub = 0; 459979d5199SDavid Brownell } 460979d5199SDavid Brownell 461979d5199SDavid Brownell static void hub_quiesce(struct usb_hub *hub) 462979d5199SDavid Brownell { 463979d5199SDavid Brownell /* (blocking) stop khubd and related activity */ 464979d5199SDavid Brownell __hub_quiesce(hub); 4651da177e4SLinus Torvalds usb_kill_urb(hub->urb); 4661da177e4SLinus Torvalds if (hub->has_indicators) 4671da177e4SLinus Torvalds cancel_delayed_work(&hub->leds); 4681da177e4SLinus Torvalds if (hub->has_indicators || hub->tt.hub) 4691da177e4SLinus Torvalds flush_scheduled_work(); 4701da177e4SLinus Torvalds } 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds static void hub_activate(struct usb_hub *hub) 4731da177e4SLinus Torvalds { 4741da177e4SLinus Torvalds int status; 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds hub->quiescing = 0; 4771da177e4SLinus Torvalds hub->activating = 1; 478979d5199SDavid Brownell hub->resume_root_hub = 0; 4791da177e4SLinus Torvalds status = usb_submit_urb(hub->urb, GFP_NOIO); 4801da177e4SLinus Torvalds if (status < 0) 4811da177e4SLinus Torvalds dev_err(hub->intfdev, "activate --> %d\n", status); 4821da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 4831da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds /* scan all ports ASAP */ 4861da177e4SLinus Torvalds kick_khubd(hub); 4871da177e4SLinus Torvalds } 4881da177e4SLinus Torvalds 4891da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 4901da177e4SLinus Torvalds u16 *status, u16 *change) 4911da177e4SLinus Torvalds { 4921da177e4SLinus Torvalds int ret; 4931da177e4SLinus Torvalds 4941da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 4951da177e4SLinus Torvalds if (ret < 0) 4961da177e4SLinus Torvalds dev_err (hub->intfdev, 4971da177e4SLinus Torvalds "%s failed (err = %d)\n", __FUNCTION__, ret); 4981da177e4SLinus Torvalds else { 4991da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 5001da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 5011da177e4SLinus Torvalds ret = 0; 5021da177e4SLinus Torvalds } 5031da177e4SLinus Torvalds return ret; 5041da177e4SLinus Torvalds } 5051da177e4SLinus Torvalds 5068b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 5078b28c752SAlan Stern { 5088b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 5098b28c752SAlan Stern int ret; 5108b28c752SAlan Stern 5118b28c752SAlan Stern if (hdev->children[port1-1] && set_state) { 5128b28c752SAlan Stern usb_set_device_state(hdev->children[port1-1], 5138b28c752SAlan Stern USB_STATE_NOTATTACHED); 5148b28c752SAlan Stern } 5158b28c752SAlan Stern ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); 5168b28c752SAlan Stern if (ret) 5178b28c752SAlan Stern dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 5188b28c752SAlan Stern port1, ret); 5198b28c752SAlan Stern 5208b28c752SAlan Stern return ret; 5218b28c752SAlan Stern } 5228b28c752SAlan Stern 5231da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 5241da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 5251da177e4SLinus Torvalds { 5261da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 5271da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 5281da177e4SLinus Torvalds u16 hubstatus, hubchange; 52974ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 5301da177e4SLinus Torvalds unsigned int pipe; 5311da177e4SLinus Torvalds int maxp, ret; 5321da177e4SLinus Torvalds char *message; 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL, 5351da177e4SLinus Torvalds &hub->buffer_dma); 5361da177e4SLinus Torvalds if (!hub->buffer) { 5371da177e4SLinus Torvalds message = "can't allocate hub irq buffer"; 5381da177e4SLinus Torvalds ret = -ENOMEM; 5391da177e4SLinus Torvalds goto fail; 5401da177e4SLinus Torvalds } 5411da177e4SLinus Torvalds 5421da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 5431da177e4SLinus Torvalds if (!hub->status) { 5441da177e4SLinus Torvalds message = "can't kmalloc hub status buffer"; 5451da177e4SLinus Torvalds ret = -ENOMEM; 5461da177e4SLinus Torvalds goto fail; 5471da177e4SLinus Torvalds } 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 5501da177e4SLinus Torvalds if (!hub->descriptor) { 5511da177e4SLinus Torvalds message = "can't kmalloc hub descriptor"; 5521da177e4SLinus Torvalds ret = -ENOMEM; 5531da177e4SLinus Torvalds goto fail; 5541da177e4SLinus Torvalds } 5551da177e4SLinus Torvalds 5561da177e4SLinus Torvalds /* Request the entire hub descriptor. 5571da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 5581da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 5591da177e4SLinus Torvalds */ 5601da177e4SLinus Torvalds ret = get_hub_descriptor(hdev, hub->descriptor, 5611da177e4SLinus Torvalds sizeof(*hub->descriptor)); 5621da177e4SLinus Torvalds if (ret < 0) { 5631da177e4SLinus Torvalds message = "can't read hub descriptor"; 5641da177e4SLinus Torvalds goto fail; 5651da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 5661da177e4SLinus Torvalds message = "hub has too many ports!"; 5671da177e4SLinus Torvalds ret = -ENODEV; 5681da177e4SLinus Torvalds goto fail; 5691da177e4SLinus Torvalds } 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 5721da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 5731da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 5741da177e4SLinus Torvalds 57574ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 5761da177e4SLinus Torvalds 57774ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_COMPOUND) { 5781da177e4SLinus Torvalds int i; 5791da177e4SLinus Torvalds char portstr [USB_MAXCHILDREN + 1]; 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 5821da177e4SLinus Torvalds portstr[i] = hub->descriptor->DeviceRemovable 5831da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 5841da177e4SLinus Torvalds ? 'F' : 'R'; 5851da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 5861da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 5871da177e4SLinus Torvalds } else 5881da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 5891da177e4SLinus Torvalds 59074ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 5911da177e4SLinus Torvalds case 0x00: 5921da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 5931da177e4SLinus Torvalds break; 5941da177e4SLinus Torvalds case 0x01: 5951da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 5961da177e4SLinus Torvalds break; 5971da177e4SLinus Torvalds case 0x02: 5981da177e4SLinus Torvalds case 0x03: 5991da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 6001da177e4SLinus Torvalds break; 6011da177e4SLinus Torvalds } 6021da177e4SLinus Torvalds 60374ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 6041da177e4SLinus Torvalds case 0x00: 6051da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 6061da177e4SLinus Torvalds break; 6071da177e4SLinus Torvalds case 0x08: 6081da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 6091da177e4SLinus Torvalds break; 6101da177e4SLinus Torvalds case 0x10: 6111da177e4SLinus Torvalds case 0x18: 6121da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 6131da177e4SLinus Torvalds break; 6141da177e4SLinus Torvalds } 6151da177e4SLinus Torvalds 6161da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 6171da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 6181da177e4SLinus Torvalds INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub); 6191da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 6201da177e4SLinus Torvalds case 0: 6211da177e4SLinus Torvalds break; 6221da177e4SLinus Torvalds case 1: 6231da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 6241da177e4SLinus Torvalds hub->tt.hub = hdev; 6251da177e4SLinus Torvalds break; 6261da177e4SLinus Torvalds case 2: 6271da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 6281da177e4SLinus Torvalds if (ret == 0) { 6291da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 6301da177e4SLinus Torvalds hub->tt.multi = 1; 6311da177e4SLinus Torvalds } else 6321da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 6331da177e4SLinus Torvalds ret); 6341da177e4SLinus Torvalds hub->tt.hub = hdev; 6351da177e4SLinus Torvalds break; 6361da177e4SLinus Torvalds default: 6371da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 6381da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 6391da177e4SLinus Torvalds break; 6401da177e4SLinus Torvalds } 6411da177e4SLinus Torvalds 642e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 64374ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 644e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 645e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 646e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 647e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 648e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 649e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 650e09711aeSdavid-b@pacbell.net } 6511da177e4SLinus Torvalds break; 652e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 653e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 654e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 655e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 656e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 6571da177e4SLinus Torvalds break; 658e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 659e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 660e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 661e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 662e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 6631da177e4SLinus Torvalds break; 664e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 665e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 666e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 667e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 668e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 6691da177e4SLinus Torvalds break; 6701da177e4SLinus Torvalds } 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 67374ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 6741da177e4SLinus Torvalds hub->has_indicators = 1; 6751da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 6761da177e4SLinus Torvalds } 6771da177e4SLinus Torvalds 6781da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 6791da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 6801da177e4SLinus Torvalds 6811da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 6821da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 6831da177e4SLinus Torvalds */ 6841da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 6851da177e4SLinus Torvalds if (ret < 0) { 6861da177e4SLinus Torvalds message = "can't get hub status"; 6871da177e4SLinus Torvalds goto fail; 6881da177e4SLinus Torvalds } 6897d35b929SAlan Stern le16_to_cpus(&hubstatus); 6907d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 6917d35b929SAlan Stern struct usb_hcd *hcd = 6927d35b929SAlan Stern container_of(hdev->bus, struct usb_hcd, self); 6937d35b929SAlan Stern 6947d35b929SAlan Stern hub->power_budget = min(500u, hcd->power_budget) / 2; 6957d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 6961da177e4SLinus Torvalds dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 6971da177e4SLinus Torvalds hub->descriptor->bHubContrCurrent); 6981da177e4SLinus Torvalds hub->power_budget = (501 - hub->descriptor->bHubContrCurrent) 6991da177e4SLinus Torvalds / 2; 7007d35b929SAlan Stern } 7017d35b929SAlan Stern if (hub->power_budget) 7021da177e4SLinus Torvalds dev_dbg(hub_dev, "%dmA bus power budget for children\n", 7031da177e4SLinus Torvalds hub->power_budget * 2); 7041da177e4SLinus Torvalds 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 7071da177e4SLinus Torvalds if (ret < 0) { 7081da177e4SLinus Torvalds message = "can't get hub status"; 7091da177e4SLinus Torvalds goto fail; 7101da177e4SLinus Torvalds } 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds /* local power status reports aren't always correct */ 7131da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 7141da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 7151da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 7161da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 7171da177e4SLinus Torvalds 71874ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 7191da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 7201da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds /* set up the interrupt endpoint */ 7231da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 7241da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 7271da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 7281da177e4SLinus Torvalds 7291da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 7301da177e4SLinus Torvalds if (!hub->urb) { 7311da177e4SLinus Torvalds message = "couldn't allocate interrupt urb"; 7321da177e4SLinus Torvalds ret = -ENOMEM; 7331da177e4SLinus Torvalds goto fail; 7341da177e4SLinus Torvalds } 7351da177e4SLinus Torvalds 7361da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 7371da177e4SLinus Torvalds hub, endpoint->bInterval); 7381da177e4SLinus Torvalds hub->urb->transfer_dma = hub->buffer_dma; 7391da177e4SLinus Torvalds hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 7401da177e4SLinus Torvalds 7411da177e4SLinus Torvalds /* maybe cycle the hub leds */ 7421da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 7431da177e4SLinus Torvalds hub->indicator [0] = INDICATOR_CYCLE; 7441da177e4SLinus Torvalds 7451da177e4SLinus Torvalds hub_power_on(hub); 7461da177e4SLinus Torvalds hub_activate(hub); 7471da177e4SLinus Torvalds return 0; 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds fail: 7501da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 7511da177e4SLinus Torvalds message, ret); 7521da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 7531da177e4SLinus Torvalds return ret; 7541da177e4SLinus Torvalds } 7551da177e4SLinus Torvalds 7561da177e4SLinus Torvalds static unsigned highspeed_hubs; 7571da177e4SLinus Torvalds 758bf193d3cSAlan Stern /* Called after the hub driver is unbound from a hub with children */ 759bf193d3cSAlan Stern static void hub_remove_children_work(void *__hub) 760bf193d3cSAlan Stern { 761bf193d3cSAlan Stern struct usb_hub *hub = __hub; 762bf193d3cSAlan Stern struct usb_device *hdev = hub->hdev; 763bf193d3cSAlan Stern int i; 764bf193d3cSAlan Stern 765bf193d3cSAlan Stern kfree(hub); 766bf193d3cSAlan Stern 767bf193d3cSAlan Stern usb_lock_device(hdev); 768bf193d3cSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 769bf193d3cSAlan Stern if (hdev->children[i]) 770bf193d3cSAlan Stern usb_disconnect(&hdev->children[i]); 771bf193d3cSAlan Stern } 772bf193d3cSAlan Stern usb_unlock_device(hdev); 773bf193d3cSAlan Stern usb_put_dev(hdev); 774bf193d3cSAlan Stern } 775bf193d3cSAlan Stern 7761da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 7771da177e4SLinus Torvalds { 7781da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 7791da177e4SLinus Torvalds struct usb_device *hdev; 780bf193d3cSAlan Stern int n, port1; 7811da177e4SLinus Torvalds 7828b28c752SAlan Stern usb_set_intfdata (intf, NULL); 7831da177e4SLinus Torvalds hdev = hub->hdev; 7841da177e4SLinus Torvalds 7851da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 7861da177e4SLinus Torvalds highspeed_hubs--; 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds hub_quiesce(hub); 7891da177e4SLinus Torvalds usb_free_urb(hub->urb); 7901da177e4SLinus Torvalds hub->urb = NULL; 7911da177e4SLinus Torvalds 7921da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 7931da177e4SLinus Torvalds list_del_init(&hub->event_list); 7941da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 7951da177e4SLinus Torvalds 7961da177e4SLinus Torvalds kfree(hub->descriptor); 7971da177e4SLinus Torvalds hub->descriptor = NULL; 7981da177e4SLinus Torvalds 7991da177e4SLinus Torvalds kfree(hub->status); 8001da177e4SLinus Torvalds hub->status = NULL; 8011da177e4SLinus Torvalds 8021da177e4SLinus Torvalds if (hub->buffer) { 8031da177e4SLinus Torvalds usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer, 8041da177e4SLinus Torvalds hub->buffer_dma); 8051da177e4SLinus Torvalds hub->buffer = NULL; 8061da177e4SLinus Torvalds } 8071da177e4SLinus Torvalds 808bf193d3cSAlan Stern /* If there are any children then this is an unbind only, not a 809bf193d3cSAlan Stern * physical disconnection. The active ports must be disabled 810bf193d3cSAlan Stern * and later on we must call usb_disconnect(). We can't call 811bf193d3cSAlan Stern * it now because we may not hold the hub's device lock. 812bf193d3cSAlan Stern */ 813bf193d3cSAlan Stern n = 0; 814bf193d3cSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 815bf193d3cSAlan Stern if (hdev->children[port1 - 1]) { 816bf193d3cSAlan Stern ++n; 817bf193d3cSAlan Stern hub_port_disable(hub, port1, 1); 818bf193d3cSAlan Stern } 819bf193d3cSAlan Stern } 820bf193d3cSAlan Stern 821bf193d3cSAlan Stern if (n == 0) 8221da177e4SLinus Torvalds kfree(hub); 823bf193d3cSAlan Stern else { 824bf193d3cSAlan Stern /* Reuse the hub->leds work_struct for our own purposes */ 825bf193d3cSAlan Stern INIT_WORK(&hub->leds, hub_remove_children_work, hub); 826bf193d3cSAlan Stern schedule_work(&hub->leds); 827bf193d3cSAlan Stern usb_get_dev(hdev); 828bf193d3cSAlan Stern } 8291da177e4SLinus Torvalds } 8301da177e4SLinus Torvalds 8311da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 8321da177e4SLinus Torvalds { 8331da177e4SLinus Torvalds struct usb_host_interface *desc; 8341da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 8351da177e4SLinus Torvalds struct usb_device *hdev; 8361da177e4SLinus Torvalds struct usb_hub *hub; 8371da177e4SLinus Torvalds 8381da177e4SLinus Torvalds desc = intf->cur_altsetting; 8391da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 8401da177e4SLinus Torvalds 8411da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 8421da177e4SLinus Torvalds /* specs is not defined, but it works */ 8431da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 8441da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 8451da177e4SLinus Torvalds descriptor_error: 8461da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 8471da177e4SLinus Torvalds return -EIO; 8481da177e4SLinus Torvalds } 8491da177e4SLinus Torvalds 8501da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 8511da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 8521da177e4SLinus Torvalds goto descriptor_error; 8531da177e4SLinus Torvalds 8541da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 8551da177e4SLinus Torvalds 8561da177e4SLinus Torvalds /* Output endpoint? Curiouser and curiouser.. */ 8571da177e4SLinus Torvalds if (!(endpoint->bEndpointAddress & USB_DIR_IN)) 8581da177e4SLinus Torvalds goto descriptor_error; 8591da177e4SLinus Torvalds 8601da177e4SLinus Torvalds /* If it's not an interrupt endpoint, we'd better punt! */ 8611da177e4SLinus Torvalds if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) 8621da177e4SLinus Torvalds != USB_ENDPOINT_XFER_INT) 8631da177e4SLinus Torvalds goto descriptor_error; 8641da177e4SLinus Torvalds 8651da177e4SLinus Torvalds /* We found a hub */ 8661da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 8671da177e4SLinus Torvalds 8681da177e4SLinus Torvalds hub = kmalloc(sizeof(*hub), GFP_KERNEL); 8691da177e4SLinus Torvalds if (!hub) { 8701da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 8711da177e4SLinus Torvalds return -ENOMEM; 8721da177e4SLinus Torvalds } 8731da177e4SLinus Torvalds 8741da177e4SLinus Torvalds memset(hub, 0, sizeof(*hub)); 8751da177e4SLinus Torvalds 8761da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 8771da177e4SLinus Torvalds hub->intfdev = &intf->dev; 8781da177e4SLinus Torvalds hub->hdev = hdev; 8791da177e4SLinus Torvalds INIT_WORK(&hub->leds, led_work, hub); 8801da177e4SLinus Torvalds 8811da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 8821da177e4SLinus Torvalds 8831da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 8841da177e4SLinus Torvalds highspeed_hubs++; 8851da177e4SLinus Torvalds 8861da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 8871da177e4SLinus Torvalds return 0; 8881da177e4SLinus Torvalds 8891da177e4SLinus Torvalds hub_disconnect (intf); 8901da177e4SLinus Torvalds return -ENODEV; 8911da177e4SLinus Torvalds } 8921da177e4SLinus Torvalds 8931da177e4SLinus Torvalds static int 8941da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 8951da177e4SLinus Torvalds { 8961da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 8971da177e4SLinus Torvalds 8981da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 8991da177e4SLinus Torvalds switch (code) { 9001da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 9011da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 9021da177e4SLinus Torvalds int i; 9031da177e4SLinus Torvalds 9041da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 9051da177e4SLinus Torvalds if (hdev->devnum <= 0) 9061da177e4SLinus Torvalds info->nports = 0; 9071da177e4SLinus Torvalds else { 9081da177e4SLinus Torvalds info->nports = hdev->maxchild; 9091da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 9101da177e4SLinus Torvalds if (hdev->children[i] == NULL) 9111da177e4SLinus Torvalds info->port[i] = 0; 9121da177e4SLinus Torvalds else 9131da177e4SLinus Torvalds info->port[i] = 9141da177e4SLinus Torvalds hdev->children[i]->devnum; 9151da177e4SLinus Torvalds } 9161da177e4SLinus Torvalds } 9171da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 9181da177e4SLinus Torvalds 9191da177e4SLinus Torvalds return info->nports + 1; 9201da177e4SLinus Torvalds } 9211da177e4SLinus Torvalds 9221da177e4SLinus Torvalds default: 9231da177e4SLinus Torvalds return -ENOSYS; 9241da177e4SLinus Torvalds } 9251da177e4SLinus Torvalds } 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds /* caller has locked the hub device */ 9281da177e4SLinus Torvalds static void hub_pre_reset(struct usb_hub *hub) 9291da177e4SLinus Torvalds { 9301da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 9311da177e4SLinus Torvalds int i; 9321da177e4SLinus Torvalds 9331da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; ++i) { 9341da177e4SLinus Torvalds if (hdev->children[i]) 9351da177e4SLinus Torvalds usb_disconnect(&hdev->children[i]); 9361da177e4SLinus Torvalds } 9371da177e4SLinus Torvalds hub_quiesce(hub); 9381da177e4SLinus Torvalds } 9391da177e4SLinus Torvalds 9401da177e4SLinus Torvalds /* caller has locked the hub device */ 9411da177e4SLinus Torvalds static void hub_post_reset(struct usb_hub *hub) 9421da177e4SLinus Torvalds { 9431da177e4SLinus Torvalds hub_activate(hub); 9441da177e4SLinus Torvalds hub_power_on(hub); 9451da177e4SLinus Torvalds } 9461da177e4SLinus Torvalds 9471da177e4SLinus Torvalds 9481da177e4SLinus Torvalds /* grab device/port lock, returning index of that port (zero based). 9491da177e4SLinus Torvalds * protects the upstream link used by this device from concurrent 9501da177e4SLinus Torvalds * tree operations like suspend, resume, reset, and disconnect, which 9511da177e4SLinus Torvalds * apply to everything downstream of a given port. 9521da177e4SLinus Torvalds */ 9531da177e4SLinus Torvalds static int locktree(struct usb_device *udev) 9541da177e4SLinus Torvalds { 9551da177e4SLinus Torvalds int t; 9561da177e4SLinus Torvalds struct usb_device *hdev; 9571da177e4SLinus Torvalds 9581da177e4SLinus Torvalds if (!udev) 9591da177e4SLinus Torvalds return -ENODEV; 9601da177e4SLinus Torvalds 9611da177e4SLinus Torvalds /* root hub is always the first lock in the series */ 9621da177e4SLinus Torvalds hdev = udev->parent; 9631da177e4SLinus Torvalds if (!hdev) { 9641da177e4SLinus Torvalds usb_lock_device(udev); 9651da177e4SLinus Torvalds return 0; 9661da177e4SLinus Torvalds } 9671da177e4SLinus Torvalds 9681da177e4SLinus Torvalds /* on the path from root to us, lock everything from 9691da177e4SLinus Torvalds * top down, dropping parent locks when not needed 9701da177e4SLinus Torvalds */ 9711da177e4SLinus Torvalds t = locktree(hdev); 9721da177e4SLinus Torvalds if (t < 0) 9731da177e4SLinus Torvalds return t; 9741da177e4SLinus Torvalds for (t = 0; t < hdev->maxchild; t++) { 9751da177e4SLinus Torvalds if (hdev->children[t] == udev) { 9761da177e4SLinus Torvalds /* everything is fail-fast once disconnect 9771da177e4SLinus Torvalds * processing starts 9781da177e4SLinus Torvalds */ 9791da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 9801da177e4SLinus Torvalds break; 9811da177e4SLinus Torvalds 9821da177e4SLinus Torvalds /* when everyone grabs locks top->bottom, 9831da177e4SLinus Torvalds * non-overlapping work may be concurrent 9841da177e4SLinus Torvalds */ 9851da177e4SLinus Torvalds down(&udev->serialize); 9861da177e4SLinus Torvalds up(&hdev->serialize); 9871da177e4SLinus Torvalds return t + 1; 9881da177e4SLinus Torvalds } 9891da177e4SLinus Torvalds } 9901da177e4SLinus Torvalds usb_unlock_device(hdev); 9911da177e4SLinus Torvalds return -ENODEV; 9921da177e4SLinus Torvalds } 9931da177e4SLinus Torvalds 9941da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 9951da177e4SLinus Torvalds { 9961da177e4SLinus Torvalds int i; 9971da177e4SLinus Torvalds 9981da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 9991da177e4SLinus Torvalds if (udev->children[i]) 10001da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev->children[i]); 10011da177e4SLinus Torvalds } 10021da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 10031da177e4SLinus Torvalds } 10041da177e4SLinus Torvalds 10051da177e4SLinus Torvalds /** 10061da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 10071da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 10081da177e4SLinus Torvalds * @new_state: new state value to be stored 10091da177e4SLinus Torvalds * 10101da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 10111da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 10121da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 10131da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 10141da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 10151da177e4SLinus Torvalds * all changes to any device's state must be protected by the 10161da177e4SLinus Torvalds * device_state_lock spinlock. 10171da177e4SLinus Torvalds * 10181da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 10191da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 10201da177e4SLinus Torvalds * 10211da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 10221da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 10231da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 10241da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 10251da177e4SLinus Torvalds */ 10261da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 10271da177e4SLinus Torvalds enum usb_device_state new_state) 10281da177e4SLinus Torvalds { 10291da177e4SLinus Torvalds unsigned long flags; 10301da177e4SLinus Torvalds 10311da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 10321da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 10331da177e4SLinus Torvalds ; /* do nothing */ 1034b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 10351da177e4SLinus Torvalds udev->state = new_state; 1036b94dc6b5SDavid Brownell if (new_state == USB_STATE_CONFIGURED) 1037b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 1038b94dc6b5SDavid Brownell (udev->actconfig->desc.bmAttributes 1039b94dc6b5SDavid Brownell & USB_CONFIG_ATT_WAKEUP)); 1040b94dc6b5SDavid Brownell else if (new_state != USB_STATE_SUSPENDED) 1041b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 0); 1042b94dc6b5SDavid Brownell } else 10431da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 10441da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 10451da177e4SLinus Torvalds } 10461da177e4SLinus Torvalds EXPORT_SYMBOL(usb_set_device_state); 10471da177e4SLinus Torvalds 10481da177e4SLinus Torvalds 10491da177e4SLinus Torvalds static void choose_address(struct usb_device *udev) 10501da177e4SLinus Torvalds { 10511da177e4SLinus Torvalds int devnum; 10521da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 10531da177e4SLinus Torvalds 10541da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 10551da177e4SLinus Torvalds 10561da177e4SLinus Torvalds /* Try to allocate the next devnum beginning at bus->devnum_next. */ 10571da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 10581da177e4SLinus Torvalds bus->devnum_next); 10591da177e4SLinus Torvalds if (devnum >= 128) 10601da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1); 10611da177e4SLinus Torvalds 10621da177e4SLinus Torvalds bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); 10631da177e4SLinus Torvalds 10641da177e4SLinus Torvalds if (devnum < 128) { 10651da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 10661da177e4SLinus Torvalds udev->devnum = devnum; 10671da177e4SLinus Torvalds } 10681da177e4SLinus Torvalds } 10691da177e4SLinus Torvalds 10701da177e4SLinus Torvalds static void release_address(struct usb_device *udev) 10711da177e4SLinus Torvalds { 10721da177e4SLinus Torvalds if (udev->devnum > 0) { 10731da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 10741da177e4SLinus Torvalds udev->devnum = -1; 10751da177e4SLinus Torvalds } 10761da177e4SLinus Torvalds } 10771da177e4SLinus Torvalds 10781da177e4SLinus Torvalds /** 10791da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 10801da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 10811da177e4SLinus Torvalds * Context: !in_interrupt () 10821da177e4SLinus Torvalds * 10831da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 10841da177e4SLinus Torvalds * 10851da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 10861da177e4SLinus Torvalds * If *pdev is a root hub then this routine will acquire the 10871da177e4SLinus Torvalds * usb_bus_list_lock on behalf of the caller. 10881da177e4SLinus Torvalds * 10891da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 10901da177e4SLinus Torvalds * controllers) should ever call this. 10911da177e4SLinus Torvalds * 10921da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 10931da177e4SLinus Torvalds */ 10941da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 10951da177e4SLinus Torvalds { 10961da177e4SLinus Torvalds struct usb_device *udev = *pdev; 10971da177e4SLinus Torvalds int i; 10981da177e4SLinus Torvalds 10991da177e4SLinus Torvalds if (!udev) { 11001da177e4SLinus Torvalds pr_debug ("%s nodev\n", __FUNCTION__); 11011da177e4SLinus Torvalds return; 11021da177e4SLinus Torvalds } 11031da177e4SLinus Torvalds 11041da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 11051da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 11061da177e4SLinus Torvalds * this quiesces everyting except pending urbs. 11071da177e4SLinus Torvalds */ 11081da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 11091da177e4SLinus Torvalds 11101da177e4SLinus Torvalds /* lock the bus list on behalf of HCDs unregistering their root hubs */ 11111da177e4SLinus Torvalds if (!udev->parent) { 11121da177e4SLinus Torvalds down(&usb_bus_list_lock); 11131da177e4SLinus Torvalds usb_lock_device(udev); 11141da177e4SLinus Torvalds } else 11151da177e4SLinus Torvalds down(&udev->serialize); 11161da177e4SLinus Torvalds 11171da177e4SLinus Torvalds dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); 11181da177e4SLinus Torvalds 11191da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 11201da177e4SLinus Torvalds for (i = 0; i < USB_MAXCHILDREN; i++) { 11211da177e4SLinus Torvalds if (udev->children[i]) 11221da177e4SLinus Torvalds usb_disconnect(&udev->children[i]); 11231da177e4SLinus Torvalds } 11241da177e4SLinus Torvalds 11251da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 11261da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 11271da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 11281da177e4SLinus Torvalds */ 11291da177e4SLinus Torvalds usb_disable_device(udev, 0); 11301da177e4SLinus Torvalds 11311da177e4SLinus Torvalds /* Free the device number, remove the /proc/bus/usb entry and 11321da177e4SLinus Torvalds * the sysfs attributes, and delete the parent's children[] 11331da177e4SLinus Torvalds * (or root_hub) pointer. 11341da177e4SLinus Torvalds */ 11351da177e4SLinus Torvalds dev_dbg (&udev->dev, "unregistering device\n"); 11361da177e4SLinus Torvalds release_address(udev); 11371da177e4SLinus Torvalds usbfs_remove_device(udev); 1138fbf82fd2SKay Sievers usbdev_remove(udev); 11391da177e4SLinus Torvalds usb_remove_sysfs_dev_files(udev); 11401da177e4SLinus Torvalds 11411da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 11421da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 11431da177e4SLinus Torvalds *pdev = NULL; 11441da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 11451da177e4SLinus Torvalds 11461da177e4SLinus Torvalds if (!udev->parent) { 11471da177e4SLinus Torvalds usb_unlock_device(udev); 11481da177e4SLinus Torvalds up(&usb_bus_list_lock); 11491da177e4SLinus Torvalds } else 11501da177e4SLinus Torvalds up(&udev->serialize); 11511da177e4SLinus Torvalds 11521da177e4SLinus Torvalds device_unregister(&udev->dev); 11531da177e4SLinus Torvalds } 11541da177e4SLinus Torvalds 11551da177e4SLinus Torvalds static int choose_configuration(struct usb_device *udev) 11561da177e4SLinus Torvalds { 11571da177e4SLinus Torvalds int c, i; 11581da177e4SLinus Torvalds 11591da177e4SLinus Torvalds /* NOTE: this should interact with hub power budgeting */ 11601da177e4SLinus Torvalds 11611da177e4SLinus Torvalds c = udev->config[0].desc.bConfigurationValue; 11621da177e4SLinus Torvalds if (udev->descriptor.bNumConfigurations != 1) { 11631da177e4SLinus Torvalds for (i = 0; i < udev->descriptor.bNumConfigurations; i++) { 11641da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 11651da177e4SLinus Torvalds 11661da177e4SLinus Torvalds /* heuristic: Linux is more likely to have class 11671da177e4SLinus Torvalds * drivers, so avoid vendor-specific interfaces. 11681da177e4SLinus Torvalds */ 11691da177e4SLinus Torvalds desc = &udev->config[i].intf_cache[0] 11701da177e4SLinus Torvalds ->altsetting->desc; 11711da177e4SLinus Torvalds if (desc->bInterfaceClass == USB_CLASS_VENDOR_SPEC) 11721da177e4SLinus Torvalds continue; 11731da177e4SLinus Torvalds /* COMM/2/all is CDC ACM, except 0xff is MSFT RNDIS. 11741da177e4SLinus Torvalds * MSFT needs this to be the first config; never use 11751da177e4SLinus Torvalds * it as the default unless Linux has host-side RNDIS. 11761da177e4SLinus Torvalds * A second config would ideally be CDC-Ethernet, but 11771da177e4SLinus Torvalds * may instead be the "vendor specific" CDC subset 11781da177e4SLinus Torvalds * long used by ARM Linux for sa1100 or pxa255. 11791da177e4SLinus Torvalds */ 11801da177e4SLinus Torvalds if (desc->bInterfaceClass == USB_CLASS_COMM 11811da177e4SLinus Torvalds && desc->bInterfaceSubClass == 2 11821da177e4SLinus Torvalds && desc->bInterfaceProtocol == 0xff) { 11831da177e4SLinus Torvalds c = udev->config[1].desc.bConfigurationValue; 11841da177e4SLinus Torvalds continue; 11851da177e4SLinus Torvalds } 11861da177e4SLinus Torvalds c = udev->config[i].desc.bConfigurationValue; 11871da177e4SLinus Torvalds break; 11881da177e4SLinus Torvalds } 11891da177e4SLinus Torvalds dev_info(&udev->dev, 11901da177e4SLinus Torvalds "configuration #%d chosen from %d choices\n", 11911da177e4SLinus Torvalds c, udev->descriptor.bNumConfigurations); 11921da177e4SLinus Torvalds } 11931da177e4SLinus Torvalds return c; 11941da177e4SLinus Torvalds } 11951da177e4SLinus Torvalds 11961da177e4SLinus Torvalds #ifdef DEBUG 11971da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 11981da177e4SLinus Torvalds { 11991da177e4SLinus Torvalds if (!string) 12001da177e4SLinus Torvalds return; 12011da177e4SLinus Torvalds dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); 12021da177e4SLinus Torvalds } 12031da177e4SLinus Torvalds 12041da177e4SLinus Torvalds #else 12051da177e4SLinus Torvalds static inline void show_string(struct usb_device *udev, char *id, char *string) 12061da177e4SLinus Torvalds {} 12071da177e4SLinus Torvalds #endif 12081da177e4SLinus Torvalds 12091da177e4SLinus Torvalds static void get_string(struct usb_device *udev, char **string, int index) 12101da177e4SLinus Torvalds { 12111da177e4SLinus Torvalds char *buf; 12121da177e4SLinus Torvalds 12131da177e4SLinus Torvalds if (!index) 12141da177e4SLinus Torvalds return; 12151da177e4SLinus Torvalds buf = kmalloc(256, GFP_KERNEL); 12161da177e4SLinus Torvalds if (!buf) 12171da177e4SLinus Torvalds return; 12181da177e4SLinus Torvalds if (usb_string(udev, index, buf, 256) > 0) 12191da177e4SLinus Torvalds *string = buf; 12201da177e4SLinus Torvalds else 12211da177e4SLinus Torvalds kfree(buf); 12221da177e4SLinus Torvalds } 12231da177e4SLinus Torvalds 12241da177e4SLinus Torvalds 12251da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 12261da177e4SLinus Torvalds #include "otg_whitelist.h" 12271da177e4SLinus Torvalds #endif 12281da177e4SLinus Torvalds 12291da177e4SLinus Torvalds /** 12301da177e4SLinus Torvalds * usb_new_device - perform initial device setup (usbcore-internal) 12311da177e4SLinus Torvalds * @udev: newly addressed device (in ADDRESS state) 12321da177e4SLinus Torvalds * 12331da177e4SLinus Torvalds * This is called with devices which have been enumerated, but not yet 12341da177e4SLinus Torvalds * configured. The device descriptor is available, but not descriptors 12351da177e4SLinus Torvalds * for any device configuration. The caller must have locked udev and 12361da177e4SLinus Torvalds * either the parent hub (if udev is a normal device) or else the 12371da177e4SLinus Torvalds * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 12381da177e4SLinus Torvalds * udev has already been installed, but udev is not yet visible through 12391da177e4SLinus Torvalds * sysfs or other filesystem code. 12401da177e4SLinus Torvalds * 12411da177e4SLinus Torvalds * Returns 0 for success (device is configured and listed, with its 12421da177e4SLinus Torvalds * interfaces, in sysfs); else a negative errno value. 12431da177e4SLinus Torvalds * 12441da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 12451da177e4SLinus Torvalds * 12461da177e4SLinus Torvalds * Only the hub driver should ever call this; root hub registration 12471da177e4SLinus Torvalds * uses it indirectly. 12481da177e4SLinus Torvalds */ 12491da177e4SLinus Torvalds int usb_new_device(struct usb_device *udev) 12501da177e4SLinus Torvalds { 12511da177e4SLinus Torvalds int err; 12521da177e4SLinus Torvalds int c; 12531da177e4SLinus Torvalds 12541da177e4SLinus Torvalds err = usb_get_configuration(udev); 12551da177e4SLinus Torvalds if (err < 0) { 12561da177e4SLinus Torvalds dev_err(&udev->dev, "can't read configurations, error %d\n", 12571da177e4SLinus Torvalds err); 12581da177e4SLinus Torvalds goto fail; 12591da177e4SLinus Torvalds } 12601da177e4SLinus Torvalds 12611da177e4SLinus Torvalds /* read the standard strings and cache them if present */ 12621da177e4SLinus Torvalds get_string(udev, &udev->product, udev->descriptor.iProduct); 12631da177e4SLinus Torvalds get_string(udev, &udev->manufacturer, udev->descriptor.iManufacturer); 12641da177e4SLinus Torvalds get_string(udev, &udev->serial, udev->descriptor.iSerialNumber); 12651da177e4SLinus Torvalds 12661da177e4SLinus Torvalds /* Tell the world! */ 12671da177e4SLinus Torvalds dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, " 12681da177e4SLinus Torvalds "SerialNumber=%d\n", 12691da177e4SLinus Torvalds udev->descriptor.iManufacturer, 12701da177e4SLinus Torvalds udev->descriptor.iProduct, 12711da177e4SLinus Torvalds udev->descriptor.iSerialNumber); 12721da177e4SLinus Torvalds show_string(udev, "Product", udev->product); 12731da177e4SLinus Torvalds show_string(udev, "Manufacturer", udev->manufacturer); 12741da177e4SLinus Torvalds show_string(udev, "SerialNumber", udev->serial); 12751da177e4SLinus Torvalds 12761da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 12771da177e4SLinus Torvalds /* 12781da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 12791da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 12801da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 12811da177e4SLinus Torvalds */ 12821da177e4SLinus Torvalds if (!udev->bus->is_b_host 12831da177e4SLinus Torvalds && udev->config 12841da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 12851da177e4SLinus Torvalds struct usb_otg_descriptor *desc = 0; 12861da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 12871da177e4SLinus Torvalds 12881da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 12891da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 12901da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 12911da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 12921da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 12931da177e4SLinus Torvalds unsigned port1; 12941da177e4SLinus Torvalds struct usb_device *root = udev->parent; 12951da177e4SLinus Torvalds 12961da177e4SLinus Torvalds for (port1 = 1; port1 <= root->maxchild; 12971da177e4SLinus Torvalds port1++) { 12981da177e4SLinus Torvalds if (root->children[port1-1] == udev) 12991da177e4SLinus Torvalds break; 13001da177e4SLinus Torvalds } 13011da177e4SLinus Torvalds 13021da177e4SLinus Torvalds dev_info(&udev->dev, 13031da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 13041da177e4SLinus Torvalds (port1 == bus->otg_port) 13051da177e4SLinus Torvalds ? "" : "non-"); 13061da177e4SLinus Torvalds 13071da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 13081da177e4SLinus Torvalds if (port1 == bus->otg_port) 13091da177e4SLinus Torvalds bus->b_hnp_enable = 1; 13101da177e4SLinus Torvalds err = usb_control_msg(udev, 13111da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 13121da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 13131da177e4SLinus Torvalds bus->b_hnp_enable 13141da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 13151da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 13161da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 13171da177e4SLinus Torvalds if (err < 0) { 13181da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 13191da177e4SLinus Torvalds * customize to match your product. 13201da177e4SLinus Torvalds */ 13211da177e4SLinus Torvalds dev_info(&udev->dev, 13221da177e4SLinus Torvalds "can't set HNP mode; %d\n", 13231da177e4SLinus Torvalds err); 13241da177e4SLinus Torvalds bus->b_hnp_enable = 0; 13251da177e4SLinus Torvalds } 13261da177e4SLinus Torvalds } 13271da177e4SLinus Torvalds } 13281da177e4SLinus Torvalds } 13291da177e4SLinus Torvalds 13301da177e4SLinus Torvalds if (!is_targeted(udev)) { 13311da177e4SLinus Torvalds 13321da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 13331da177e4SLinus Torvalds * (Includes HNP test device.) 13341da177e4SLinus Torvalds */ 13351da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 13361da177e4SLinus Torvalds static int __usb_suspend_device(struct usb_device *, 1337390a8c34SDavid Brownell int port1); 1338390a8c34SDavid Brownell err = __usb_suspend_device(udev, udev->bus->otg_port); 13391da177e4SLinus Torvalds if (err < 0) 13401da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 13411da177e4SLinus Torvalds } 13421da177e4SLinus Torvalds err = -ENODEV; 13431da177e4SLinus Torvalds goto fail; 13441da177e4SLinus Torvalds } 13451da177e4SLinus Torvalds #endif 13461da177e4SLinus Torvalds 13471da177e4SLinus Torvalds /* put device-specific files into sysfs */ 13481da177e4SLinus Torvalds err = device_add (&udev->dev); 13491da177e4SLinus Torvalds if (err) { 13501da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 13511da177e4SLinus Torvalds goto fail; 13521da177e4SLinus Torvalds } 13531da177e4SLinus Torvalds usb_create_sysfs_dev_files (udev); 13541da177e4SLinus Torvalds 13551da177e4SLinus Torvalds /* choose and set the configuration. that registers the interfaces 13561da177e4SLinus Torvalds * with the driver core, and lets usb device drivers bind to them. 13571da177e4SLinus Torvalds */ 13581da177e4SLinus Torvalds c = choose_configuration(udev); 13591da177e4SLinus Torvalds if (c < 0) 13601da177e4SLinus Torvalds dev_warn(&udev->dev, 13611da177e4SLinus Torvalds "can't choose an initial configuration\n"); 13621da177e4SLinus Torvalds else { 13631da177e4SLinus Torvalds err = usb_set_configuration(udev, c); 13641da177e4SLinus Torvalds if (err) { 13651da177e4SLinus Torvalds dev_err(&udev->dev, "can't set config #%d, error %d\n", 13661da177e4SLinus Torvalds c, err); 13671da177e4SLinus Torvalds usb_remove_sysfs_dev_files(udev); 13681da177e4SLinus Torvalds device_del(&udev->dev); 13691da177e4SLinus Torvalds goto fail; 13701da177e4SLinus Torvalds } 13711da177e4SLinus Torvalds } 13721da177e4SLinus Torvalds 13731da177e4SLinus Torvalds /* USB device state == configured ... usable */ 13741da177e4SLinus Torvalds 13751da177e4SLinus Torvalds /* add a /proc/bus/usb entry */ 1376fbf82fd2SKay Sievers usbdev_add(udev); 13771da177e4SLinus Torvalds usbfs_add_device(udev); 13781da177e4SLinus Torvalds return 0; 13791da177e4SLinus Torvalds 13801da177e4SLinus Torvalds fail: 13811da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 13821da177e4SLinus Torvalds return err; 13831da177e4SLinus Torvalds } 13841da177e4SLinus Torvalds 13851da177e4SLinus Torvalds 13861da177e4SLinus Torvalds static int hub_port_status(struct usb_hub *hub, int port1, 13871da177e4SLinus Torvalds u16 *status, u16 *change) 13881da177e4SLinus Torvalds { 13891da177e4SLinus Torvalds int ret; 13901da177e4SLinus Torvalds 13911da177e4SLinus Torvalds ret = get_port_status(hub->hdev, port1, &hub->status->port); 13921da177e4SLinus Torvalds if (ret < 0) 13931da177e4SLinus Torvalds dev_err (hub->intfdev, 13941da177e4SLinus Torvalds "%s failed (err = %d)\n", __FUNCTION__, ret); 13951da177e4SLinus Torvalds else { 13961da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->port.wPortStatus); 13971da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->port.wPortChange); 13981da177e4SLinus Torvalds ret = 0; 13991da177e4SLinus Torvalds } 14001da177e4SLinus Torvalds return ret; 14011da177e4SLinus Torvalds } 14021da177e4SLinus Torvalds 14031da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 14041da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 14051da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 14061da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 14071da177e4SLinus Torvalds #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) 14081da177e4SLinus Torvalds 14091da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 14101da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 14111da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 14121da177e4SLinus Torvalds #define HUB_RESET_TIMEOUT 500 14131da177e4SLinus Torvalds 14141da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 14151da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 14161da177e4SLinus Torvalds { 14171da177e4SLinus Torvalds int delay_time, ret; 14181da177e4SLinus Torvalds u16 portstatus; 14191da177e4SLinus Torvalds u16 portchange; 14201da177e4SLinus Torvalds 14211da177e4SLinus Torvalds for (delay_time = 0; 14221da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 14231da177e4SLinus Torvalds delay_time += delay) { 14241da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 14251da177e4SLinus Torvalds msleep(delay); 14261da177e4SLinus Torvalds 14271da177e4SLinus Torvalds /* read and decode port status */ 14281da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 14291da177e4SLinus Torvalds if (ret < 0) 14301da177e4SLinus Torvalds return ret; 14311da177e4SLinus Torvalds 14321da177e4SLinus Torvalds /* Device went away? */ 14331da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 14341da177e4SLinus Torvalds return -ENOTCONN; 14351da177e4SLinus Torvalds 14361da177e4SLinus Torvalds /* bomb out completely if something weird happened */ 14371da177e4SLinus Torvalds if ((portchange & USB_PORT_STAT_C_CONNECTION)) 14381da177e4SLinus Torvalds return -EINVAL; 14391da177e4SLinus Torvalds 14401da177e4SLinus Torvalds /* if we`ve finished resetting, then break out of the loop */ 14411da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_RESET) && 14421da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_ENABLE)) { 14431da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_HIGH_SPEED) 14441da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 14451da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 14461da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 14471da177e4SLinus Torvalds else 14481da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 14491da177e4SLinus Torvalds return 0; 14501da177e4SLinus Torvalds } 14511da177e4SLinus Torvalds 14521da177e4SLinus Torvalds /* switch to the long delay after two short delay failures */ 14531da177e4SLinus Torvalds if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 14541da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 14551da177e4SLinus Torvalds 14561da177e4SLinus Torvalds dev_dbg (hub->intfdev, 14571da177e4SLinus Torvalds "port %d not reset yet, waiting %dms\n", 14581da177e4SLinus Torvalds port1, delay); 14591da177e4SLinus Torvalds } 14601da177e4SLinus Torvalds 14611da177e4SLinus Torvalds return -EBUSY; 14621da177e4SLinus Torvalds } 14631da177e4SLinus Torvalds 14641da177e4SLinus Torvalds static int hub_port_reset(struct usb_hub *hub, int port1, 14651da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 14661da177e4SLinus Torvalds { 14671da177e4SLinus Torvalds int i, status; 14681da177e4SLinus Torvalds 14691da177e4SLinus Torvalds /* Reset the port */ 14701da177e4SLinus Torvalds for (i = 0; i < PORT_RESET_TRIES; i++) { 14711da177e4SLinus Torvalds status = set_port_feature(hub->hdev, 14721da177e4SLinus Torvalds port1, USB_PORT_FEAT_RESET); 14731da177e4SLinus Torvalds if (status) 14741da177e4SLinus Torvalds dev_err(hub->intfdev, 14751da177e4SLinus Torvalds "cannot reset port %d (err = %d)\n", 14761da177e4SLinus Torvalds port1, status); 14771da177e4SLinus Torvalds else { 14781da177e4SLinus Torvalds status = hub_port_wait_reset(hub, port1, udev, delay); 1479dd16525bSDavid Brownell if (status && status != -ENOTCONN) 14801da177e4SLinus Torvalds dev_dbg(hub->intfdev, 14811da177e4SLinus Torvalds "port_wait_reset: err = %d\n", 14821da177e4SLinus Torvalds status); 14831da177e4SLinus Torvalds } 14841da177e4SLinus Torvalds 14851da177e4SLinus Torvalds /* return on disconnect or reset */ 14861da177e4SLinus Torvalds switch (status) { 14871da177e4SLinus Torvalds case 0: 1488b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 1489b789696aSDavid Brownell msleep(10 + 40); 14901da177e4SLinus Torvalds /* FALL THROUGH */ 14911da177e4SLinus Torvalds case -ENOTCONN: 14921da177e4SLinus Torvalds case -ENODEV: 14931da177e4SLinus Torvalds clear_port_feature(hub->hdev, 14941da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 14951da177e4SLinus Torvalds /* FIXME need disconnect() for NOTATTACHED device */ 14961da177e4SLinus Torvalds usb_set_device_state(udev, status 14971da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 14981da177e4SLinus Torvalds : USB_STATE_DEFAULT); 14991da177e4SLinus Torvalds return status; 15001da177e4SLinus Torvalds } 15011da177e4SLinus Torvalds 15021da177e4SLinus Torvalds dev_dbg (hub->intfdev, 15031da177e4SLinus Torvalds "port %d not enabled, trying reset again...\n", 15041da177e4SLinus Torvalds port1); 15051da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 15061da177e4SLinus Torvalds } 15071da177e4SLinus Torvalds 15081da177e4SLinus Torvalds dev_err (hub->intfdev, 15091da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 15101da177e4SLinus Torvalds port1); 15111da177e4SLinus Torvalds 15121da177e4SLinus Torvalds return status; 15131da177e4SLinus Torvalds } 15141da177e4SLinus Torvalds 15151da177e4SLinus Torvalds /* 15161da177e4SLinus Torvalds * Disable a port and mark a logical connnect-change event, so that some 15171da177e4SLinus Torvalds * time later khubd will disconnect() any existing usb_device on the port 15181da177e4SLinus Torvalds * and will re-enumerate if there actually is a device attached. 15191da177e4SLinus Torvalds */ 15201da177e4SLinus Torvalds static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 15211da177e4SLinus Torvalds { 15221da177e4SLinus Torvalds dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 15231da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 15241da177e4SLinus Torvalds 15251da177e4SLinus Torvalds /* FIXME let caller ask to power down the port: 15261da177e4SLinus Torvalds * - some devices won't enumerate without a VBUS power cycle 15271da177e4SLinus Torvalds * - SRP saves power that way 1528390a8c34SDavid Brownell * - ... new call, TBD ... 15291da177e4SLinus Torvalds * That's easy if this hub can switch power per-port, and 15301da177e4SLinus Torvalds * khubd reactivates the port later (timer, SRP, etc). 15311da177e4SLinus Torvalds * Powerdown must be optional, because of reset/DFU. 15321da177e4SLinus Torvalds */ 15331da177e4SLinus Torvalds 15341da177e4SLinus Torvalds set_bit(port1, hub->change_bits); 15351da177e4SLinus Torvalds kick_khubd(hub); 15361da177e4SLinus Torvalds } 15371da177e4SLinus Torvalds 15381da177e4SLinus Torvalds 15391da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 15401da177e4SLinus Torvalds 15411da177e4SLinus Torvalds /* 15421da177e4SLinus Torvalds * Selective port suspend reduces power; most suspended devices draw 15431da177e4SLinus Torvalds * less than 500 uA. It's also used in OTG, along with remote wakeup. 15441da177e4SLinus Torvalds * All devices below the suspended port are also suspended. 15451da177e4SLinus Torvalds * 15461da177e4SLinus Torvalds * Devices leave suspend state when the host wakes them up. Some devices 15471da177e4SLinus Torvalds * also support "remote wakeup", where the device can activate the USB 15481da177e4SLinus Torvalds * tree above them to deliver data, such as a keypress or packet. In 15491da177e4SLinus Torvalds * some cases, this wakes the USB host. 15501da177e4SLinus Torvalds */ 15511da177e4SLinus Torvalds static int hub_port_suspend(struct usb_hub *hub, int port1, 15521da177e4SLinus Torvalds struct usb_device *udev) 15531da177e4SLinus Torvalds { 15541da177e4SLinus Torvalds int status; 15551da177e4SLinus Torvalds 15561da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "suspend port %d\n", port1); 15571da177e4SLinus Torvalds 15581da177e4SLinus Torvalds /* enable remote wakeup when appropriate; this lets the device 15591da177e4SLinus Torvalds * wake up the upstream hub (including maybe the root hub). 15601da177e4SLinus Torvalds * 15611da177e4SLinus Torvalds * NOTE: OTG devices may issue remote wakeup (or SRP) even when 15621da177e4SLinus Torvalds * we don't explicitly enable it here. 15631da177e4SLinus Torvalds */ 1564b94dc6b5SDavid Brownell if (device_may_wakeup(&udev->dev)) { 15651da177e4SLinus Torvalds status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 15661da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 15671da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 15681da177e4SLinus Torvalds NULL, 0, 15691da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 15701da177e4SLinus Torvalds if (status) 15711da177e4SLinus Torvalds dev_dbg(&udev->dev, 15721da177e4SLinus Torvalds "won't remote wakeup, status %d\n", 15731da177e4SLinus Torvalds status); 15741da177e4SLinus Torvalds } 15751da177e4SLinus Torvalds 15761da177e4SLinus Torvalds /* see 7.1.7.6 */ 15771da177e4SLinus Torvalds status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); 15781da177e4SLinus Torvalds if (status) { 15791da177e4SLinus Torvalds dev_dbg(hub->intfdev, 15801da177e4SLinus Torvalds "can't suspend port %d, status %d\n", 15811da177e4SLinus Torvalds port1, status); 15821da177e4SLinus Torvalds /* paranoia: "should not happen" */ 15831da177e4SLinus Torvalds (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 15841da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 15851da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 15861da177e4SLinus Torvalds NULL, 0, 15871da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 15881da177e4SLinus Torvalds } else { 15891da177e4SLinus Torvalds /* device has up to 10 msec to fully suspend */ 15901da177e4SLinus Torvalds dev_dbg(&udev->dev, "usb suspend\n"); 15911da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_SUSPENDED); 15921da177e4SLinus Torvalds msleep(10); 15931da177e4SLinus Torvalds } 15941da177e4SLinus Torvalds return status; 15951da177e4SLinus Torvalds } 15961da177e4SLinus Torvalds 15971da177e4SLinus Torvalds /* 15981da177e4SLinus Torvalds * Devices on USB hub ports have only one "suspend" state, corresponding 1599ba9d35fbSPavel Machek * to ACPI D2, "may cause the device to lose some context". 16001da177e4SLinus Torvalds * State transitions include: 16011da177e4SLinus Torvalds * 16021da177e4SLinus Torvalds * - suspend, resume ... when the VBUS power link stays live 16031da177e4SLinus Torvalds * - suspend, disconnect ... VBUS lost 16041da177e4SLinus Torvalds * 16051da177e4SLinus Torvalds * Once VBUS drop breaks the circuit, the port it's using has to go through 16061da177e4SLinus Torvalds * normal re-enumeration procedures, starting with enabling VBUS power. 16071da177e4SLinus Torvalds * Other than re-initializing the hub (plug/unplug, except for root hubs), 16081da177e4SLinus Torvalds * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 16091da177e4SLinus Torvalds * timer, no SRP, no requests through sysfs. 1610390a8c34SDavid Brownell * 1611390a8c34SDavid Brownell * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when 1612390a8c34SDavid Brownell * the root hub for their bus goes into global suspend ... so we don't 1613390a8c34SDavid Brownell * (falsely) update the device power state to say it suspended. 16141da177e4SLinus Torvalds */ 1615390a8c34SDavid Brownell static int __usb_suspend_device (struct usb_device *udev, int port1) 16161da177e4SLinus Torvalds { 1617f3f3253dSDavid Brownell int status = 0; 16181da177e4SLinus Torvalds 16191da177e4SLinus Torvalds /* caller owns the udev device lock */ 16201da177e4SLinus Torvalds if (port1 < 0) 16211da177e4SLinus Torvalds return port1; 16221da177e4SLinus Torvalds 16231da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED 16241da177e4SLinus Torvalds || udev->state == USB_STATE_NOTATTACHED) { 16251da177e4SLinus Torvalds return 0; 16261da177e4SLinus Torvalds } 16271da177e4SLinus Torvalds 1628c9f89fa4SDavid Brownell /* all interfaces must already be suspended */ 16291da177e4SLinus Torvalds if (udev->actconfig) { 16301da177e4SLinus Torvalds int i; 16311da177e4SLinus Torvalds 16321da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 16331da177e4SLinus Torvalds struct usb_interface *intf; 16341da177e4SLinus Torvalds 16351da177e4SLinus Torvalds intf = udev->actconfig->interface[i]; 1636c9f89fa4SDavid Brownell if (is_active(intf)) { 1637c9f89fa4SDavid Brownell dev_dbg(&intf->dev, "nyet suspended\n"); 1638c9f89fa4SDavid Brownell return -EBUSY; 16391da177e4SLinus Torvalds } 16401da177e4SLinus Torvalds } 16411da177e4SLinus Torvalds } 16421da177e4SLinus Torvalds 1643f3f3253dSDavid Brownell /* we only change a device's upstream USB link. 1644f3f3253dSDavid Brownell * root hubs have no upstream USB link. 16451da177e4SLinus Torvalds */ 1646f3f3253dSDavid Brownell if (udev->parent) 16471da177e4SLinus Torvalds status = hub_port_suspend(hdev_to_hub(udev->parent), port1, 16481da177e4SLinus Torvalds udev); 16491da177e4SLinus Torvalds 16501da177e4SLinus Torvalds if (status == 0) 1651390a8c34SDavid Brownell udev->dev.power.power_state = PMSG_SUSPEND; 16521da177e4SLinus Torvalds return status; 16531da177e4SLinus Torvalds } 16541da177e4SLinus Torvalds 1655f3f3253dSDavid Brownell #endif 1656f3f3253dSDavid Brownell 16575edbfb7cSDavid Brownell /* 16581da177e4SLinus Torvalds * usb_suspend_device - suspend a usb device 16591da177e4SLinus Torvalds * @udev: device that's no longer in active use 16605edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 16611da177e4SLinus Torvalds * 16621da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 16631da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 16641da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 16651da177e4SLinus Torvalds * suspend by the host, using usb_resume_device(). It's also routine 16661da177e4SLinus Torvalds * to disconnect devices while they are suspended. 16671da177e4SLinus Torvalds * 1668390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 1669390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 1670390a8c34SDavid Brownell * 16711da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 16721da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 16731da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 16741da177e4SLinus Torvalds * 16751da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 16761da177e4SLinus Torvalds */ 1677390a8c34SDavid Brownell int usb_suspend_device(struct usb_device *udev) 16781da177e4SLinus Torvalds { 1679f3f3253dSDavid Brownell #ifdef CONFIG_USB_SUSPEND 16801da177e4SLinus Torvalds int port1, status; 16811da177e4SLinus Torvalds 16821da177e4SLinus Torvalds port1 = locktree(udev); 16831da177e4SLinus Torvalds if (port1 < 0) 16841da177e4SLinus Torvalds return port1; 16851da177e4SLinus Torvalds 1686390a8c34SDavid Brownell status = __usb_suspend_device(udev, port1); 16871da177e4SLinus Torvalds usb_unlock_device(udev); 16881da177e4SLinus Torvalds return status; 1689f3f3253dSDavid Brownell #else 1690f3f3253dSDavid Brownell /* NOTE: udev->state unchanged, it's not lying ... */ 1691f3f3253dSDavid Brownell udev->dev.power.power_state = PMSG_SUSPEND; 1692f3f3253dSDavid Brownell return 0; 1693f3f3253dSDavid Brownell #endif 16941da177e4SLinus Torvalds } 16951da177e4SLinus Torvalds 1696f3f3253dSDavid Brownell 16971da177e4SLinus Torvalds /* 1698390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 1699390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 1700390a8c34SDavid Brownell * special" resume" signaling. These routines kick in shortly after 17011da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 17021da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 17031da177e4SLinus Torvalds * in the tree that's rooted at this device. 17041da177e4SLinus Torvalds */ 1705f3f3253dSDavid Brownell static int finish_device_resume(struct usb_device *udev) 17061da177e4SLinus Torvalds { 17071da177e4SLinus Torvalds int status; 17081da177e4SLinus Torvalds u16 devstatus; 17091da177e4SLinus Torvalds 17101da177e4SLinus Torvalds /* caller owns the udev device lock */ 1711f3f3253dSDavid Brownell dev_dbg(&udev->dev, "finish resume\n"); 17121da177e4SLinus Torvalds 17131da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 17141da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 17151da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 17161da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 17171da177e4SLinus Torvalds */ 17181da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 17191da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 17201da177e4SLinus Torvalds : USB_STATE_ADDRESS); 17211da177e4SLinus Torvalds 17221da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 17231da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 17241da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 17251da177e4SLinus Torvalds */ 17261da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 17271da177e4SLinus Torvalds if (status < 0) 17281da177e4SLinus Torvalds dev_dbg(&udev->dev, 17291da177e4SLinus Torvalds "gone after usb resume? status %d\n", 17301da177e4SLinus Torvalds status); 17311da177e4SLinus Torvalds else if (udev->actconfig) { 17321da177e4SLinus Torvalds unsigned i; 1733dbc3887eSDavid Brownell int (*resume)(struct device *); 17341da177e4SLinus Torvalds 17351da177e4SLinus Torvalds le16_to_cpus(&devstatus); 1736f3f3253dSDavid Brownell if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP) 1737f3f3253dSDavid Brownell && udev->parent) { 17381da177e4SLinus Torvalds status = usb_control_msg(udev, 17391da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 17401da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, 17411da177e4SLinus Torvalds USB_RECIP_DEVICE, 17421da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 17431da177e4SLinus Torvalds NULL, 0, 17441da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 17451da177e4SLinus Torvalds if (status) { 17461da177e4SLinus Torvalds dev_dbg(&udev->dev, "disable remote " 17471da177e4SLinus Torvalds "wakeup, status %d\n", status); 17481da177e4SLinus Torvalds status = 0; 17491da177e4SLinus Torvalds } 17501da177e4SLinus Torvalds } 17511da177e4SLinus Torvalds 17521da177e4SLinus Torvalds /* resume interface drivers; if this is a hub, it 1753dbc3887eSDavid Brownell * may have a child resume event to deal with soon 17541da177e4SLinus Torvalds */ 1755dbc3887eSDavid Brownell resume = udev->dev.bus->resume; 1756dbc3887eSDavid Brownell for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) 1757dbc3887eSDavid Brownell (void) resume(&udev->actconfig->interface[i]->dev); 17581da177e4SLinus Torvalds status = 0; 17591da177e4SLinus Torvalds 17601da177e4SLinus Torvalds } else if (udev->devnum <= 0) { 17611da177e4SLinus Torvalds dev_dbg(&udev->dev, "bogus resume!\n"); 17621da177e4SLinus Torvalds status = -EINVAL; 17631da177e4SLinus Torvalds } 17641da177e4SLinus Torvalds return status; 17651da177e4SLinus Torvalds } 17661da177e4SLinus Torvalds 1767f3f3253dSDavid Brownell #ifdef CONFIG_USB_SUSPEND 1768f3f3253dSDavid Brownell 17691da177e4SLinus Torvalds static int 17701da177e4SLinus Torvalds hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev) 17711da177e4SLinus Torvalds { 17721da177e4SLinus Torvalds int status; 17731da177e4SLinus Torvalds 17741da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "resume port %d\n", port1); 17751da177e4SLinus Torvalds 17761da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 17771da177e4SLinus Torvalds status = clear_port_feature(hub->hdev, 17781da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 17791da177e4SLinus Torvalds if (status) { 17801da177e4SLinus Torvalds dev_dbg(hub->intfdev, 17811da177e4SLinus Torvalds "can't resume port %d, status %d\n", 17821da177e4SLinus Torvalds port1, status); 17831da177e4SLinus Torvalds } else { 17841da177e4SLinus Torvalds u16 devstatus; 17851da177e4SLinus Torvalds u16 portchange; 17861da177e4SLinus Torvalds 17871da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 17881da177e4SLinus Torvalds if (udev) 17891da177e4SLinus Torvalds dev_dbg(&udev->dev, "RESUME\n"); 17901da177e4SLinus Torvalds msleep(25); 17911da177e4SLinus Torvalds 17921da177e4SLinus Torvalds #define LIVE_FLAGS ( USB_PORT_STAT_POWER \ 17931da177e4SLinus Torvalds | USB_PORT_STAT_ENABLE \ 17941da177e4SLinus Torvalds | USB_PORT_STAT_CONNECTION) 17951da177e4SLinus Torvalds 17961da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 17971da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 17981da177e4SLinus Torvalds * sequence. 17991da177e4SLinus Torvalds */ 18001da177e4SLinus Torvalds devstatus = portchange = 0; 18011da177e4SLinus Torvalds status = hub_port_status(hub, port1, 18021da177e4SLinus Torvalds &devstatus, &portchange); 18031da177e4SLinus Torvalds if (status < 0 18041da177e4SLinus Torvalds || (devstatus & LIVE_FLAGS) != LIVE_FLAGS 18051da177e4SLinus Torvalds || (devstatus & USB_PORT_STAT_SUSPEND) != 0 18061da177e4SLinus Torvalds ) { 18071da177e4SLinus Torvalds dev_dbg(hub->intfdev, 18081da177e4SLinus Torvalds "port %d status %04x.%04x after resume, %d\n", 18091da177e4SLinus Torvalds port1, portchange, devstatus, status); 18101da177e4SLinus Torvalds } else { 18111da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 18121da177e4SLinus Torvalds msleep(10); 18131da177e4SLinus Torvalds if (udev) 1814f3f3253dSDavid Brownell status = finish_device_resume(udev); 18151da177e4SLinus Torvalds } 18161da177e4SLinus Torvalds } 18171da177e4SLinus Torvalds if (status < 0) 18181da177e4SLinus Torvalds hub_port_logical_disconnect(hub, port1); 18191da177e4SLinus Torvalds 18201da177e4SLinus Torvalds return status; 18211da177e4SLinus Torvalds } 18221da177e4SLinus Torvalds 1823f3f3253dSDavid Brownell #endif 18241da177e4SLinus Torvalds 18255edbfb7cSDavid Brownell /* 18261da177e4SLinus Torvalds * usb_resume_device - re-activate a suspended usb device 18271da177e4SLinus Torvalds * @udev: device to re-activate 18285edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 18291da177e4SLinus Torvalds * 18301da177e4SLinus Torvalds * This will re-activate the suspended device, increasing power usage 18311da177e4SLinus Torvalds * while letting drivers communicate again with its endpoints. 18321da177e4SLinus Torvalds * USB resume explicitly guarantees that the power session between 18331da177e4SLinus Torvalds * the host and the device is the same as it was when the device 18341da177e4SLinus Torvalds * suspended. 18351da177e4SLinus Torvalds * 18361da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 18371da177e4SLinus Torvalds */ 18381da177e4SLinus Torvalds int usb_resume_device(struct usb_device *udev) 18391da177e4SLinus Torvalds { 18401da177e4SLinus Torvalds int port1, status; 18411da177e4SLinus Torvalds 18421da177e4SLinus Torvalds port1 = locktree(udev); 18431da177e4SLinus Torvalds if (port1 < 0) 18441da177e4SLinus Torvalds return port1; 18451da177e4SLinus Torvalds 1846f3f3253dSDavid Brownell #ifdef CONFIG_USB_SUSPEND 1847f3f3253dSDavid Brownell /* selective resume of one downstream hub-to-device port */ 1848f3f3253dSDavid Brownell if (udev->parent) { 1849f3f3253dSDavid Brownell if (udev->state == USB_STATE_SUSPENDED) { 1850f3f3253dSDavid Brownell // NOTE swsusp may bork us, device state being wrong... 18511da177e4SLinus Torvalds // NOTE this fails if parent is also suspended... 18521da177e4SLinus Torvalds status = hub_port_resume(hdev_to_hub(udev->parent), 18531da177e4SLinus Torvalds port1, udev); 1854f3f3253dSDavid Brownell } else 18551da177e4SLinus Torvalds status = 0; 1856f3f3253dSDavid Brownell } else 1857f3f3253dSDavid Brownell #endif 1858f3f3253dSDavid Brownell status = finish_device_resume(udev); 1859f3f3253dSDavid Brownell if (status < 0) 18601da177e4SLinus Torvalds dev_dbg(&udev->dev, "can't resume, status %d\n", 18611da177e4SLinus Torvalds status); 18621da177e4SLinus Torvalds 18631da177e4SLinus Torvalds usb_unlock_device(udev); 18641da177e4SLinus Torvalds 18651da177e4SLinus Torvalds /* rebind drivers that had no suspend() */ 18661da177e4SLinus Torvalds if (status == 0) { 18671da177e4SLinus Torvalds usb_lock_all_devices(); 18681da177e4SLinus Torvalds bus_rescan_devices(&usb_bus_type); 18691da177e4SLinus Torvalds usb_unlock_all_devices(); 18701da177e4SLinus Torvalds } 18711da177e4SLinus Torvalds return status; 18721da177e4SLinus Torvalds } 18731da177e4SLinus Torvalds 18741da177e4SLinus Torvalds static int remote_wakeup(struct usb_device *udev) 18751da177e4SLinus Torvalds { 18761da177e4SLinus Torvalds int status = 0; 18771da177e4SLinus Torvalds 1878f3f3253dSDavid Brownell #ifdef CONFIG_USB_SUSPEND 1879f3f3253dSDavid Brownell 18801da177e4SLinus Torvalds /* don't repeat RESUME sequence if this device 18811da177e4SLinus Torvalds * was already woken up by some other task 18821da177e4SLinus Torvalds */ 18831da177e4SLinus Torvalds down(&udev->serialize); 18841da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 18851da177e4SLinus Torvalds dev_dbg(&udev->dev, "RESUME (wakeup)\n"); 18861da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 18871da177e4SLinus Torvalds msleep(10); 1888f3f3253dSDavid Brownell status = finish_device_resume(udev); 18891da177e4SLinus Torvalds } 18901da177e4SLinus Torvalds up(&udev->serialize); 1891f3f3253dSDavid Brownell #endif 18921da177e4SLinus Torvalds return status; 18931da177e4SLinus Torvalds } 18941da177e4SLinus Torvalds 1895db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 18961da177e4SLinus Torvalds { 18971da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 18981da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 18991da177e4SLinus Torvalds unsigned port1; 19001da177e4SLinus Torvalds 1901c9f89fa4SDavid Brownell /* fail if children aren't already suspended */ 19021da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 19031da177e4SLinus Torvalds struct usb_device *udev; 19041da177e4SLinus Torvalds 19051da177e4SLinus Torvalds udev = hdev->children [port1-1]; 1906f3f3253dSDavid Brownell if (udev && (udev->dev.power.power_state.event 1907f3f3253dSDavid Brownell == PM_EVENT_ON 1908f3f3253dSDavid Brownell #ifdef CONFIG_USB_SUSPEND 1909f3f3253dSDavid Brownell || udev->state != USB_STATE_SUSPENDED 1910f3f3253dSDavid Brownell #endif 1911f3f3253dSDavid Brownell )) { 1912c9f89fa4SDavid Brownell dev_dbg(&intf->dev, "port %d nyet suspended\n", port1); 1913c9f89fa4SDavid Brownell return -EBUSY; 1914c9f89fa4SDavid Brownell } 19151da177e4SLinus Torvalds } 19161da177e4SLinus Torvalds 1917f3f3253dSDavid Brownell /* "global suspend" of the downstream HC-to-USB interface */ 1918f3f3253dSDavid Brownell if (!hdev->parent) { 1919f3f3253dSDavid Brownell struct usb_bus *bus = hdev->bus; 1920f3f3253dSDavid Brownell if (bus && bus->op->hub_suspend) { 1921f3f3253dSDavid Brownell int status = bus->op->hub_suspend (bus); 1922f3f3253dSDavid Brownell 1923f3f3253dSDavid Brownell if (status != 0) { 1924f3f3253dSDavid Brownell dev_dbg(&hdev->dev, "'global' suspend %d\n", 1925f3f3253dSDavid Brownell status); 1926f3f3253dSDavid Brownell return status; 1927f3f3253dSDavid Brownell } 1928f3f3253dSDavid Brownell } else 1929f3f3253dSDavid Brownell return -EOPNOTSUPP; 1930f3f3253dSDavid Brownell } 1931f3f3253dSDavid Brownell 1932c9f89fa4SDavid Brownell /* stop khubd and related activity */ 1933c9f89fa4SDavid Brownell hub_quiesce(hub); 19341da177e4SLinus Torvalds return 0; 19351da177e4SLinus Torvalds } 19361da177e4SLinus Torvalds 19371da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 19381da177e4SLinus Torvalds { 19391da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev(intf); 19401da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 19411da177e4SLinus Torvalds int status; 19421da177e4SLinus Torvalds 1943f3f3253dSDavid Brownell /* "global resume" of the downstream HC-to-USB interface */ 1944f3f3253dSDavid Brownell if (!hdev->parent) { 1945f3f3253dSDavid Brownell struct usb_bus *bus = hdev->bus; 1946f3f3253dSDavid Brownell if (bus && bus->op->hub_resume) { 1947f3f3253dSDavid Brownell status = bus->op->hub_resume (bus); 1948f3f3253dSDavid Brownell if (status) { 1949f3f3253dSDavid Brownell dev_dbg(&intf->dev, "'global' resume %d\n", 1950f3f3253dSDavid Brownell status); 1951f3f3253dSDavid Brownell return status; 1952f3f3253dSDavid Brownell } 1953f3f3253dSDavid Brownell } else 1954f3f3253dSDavid Brownell return -EOPNOTSUPP; 1955f3f3253dSDavid Brownell if (status == 0) { 1956f3f3253dSDavid Brownell /* TRSMRCY = 10 msec */ 1957f3f3253dSDavid Brownell msleep(10); 1958f3f3253dSDavid Brownell } 1959f3f3253dSDavid Brownell } 1960f3f3253dSDavid Brownell 1961f3f3253dSDavid Brownell hub_activate(hub); 1962f3f3253dSDavid Brownell 1963f3f3253dSDavid Brownell /* REVISIT: this recursion probably shouldn't exist. Remove 1964f3f3253dSDavid Brownell * this code sometime, after retesting with different root and 1965f3f3253dSDavid Brownell * external hubs. 1966f3f3253dSDavid Brownell */ 1967f3f3253dSDavid Brownell #ifdef CONFIG_USB_SUSPEND 1968f3f3253dSDavid Brownell { 1969f3f3253dSDavid Brownell unsigned port1; 1970f3f3253dSDavid Brownell 19711da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 19721da177e4SLinus Torvalds struct usb_device *udev; 19731da177e4SLinus Torvalds u16 portstat, portchange; 19741da177e4SLinus Torvalds 19751da177e4SLinus Torvalds udev = hdev->children [port1-1]; 19761da177e4SLinus Torvalds status = hub_port_status(hub, port1, &portstat, &portchange); 19771da177e4SLinus Torvalds if (status == 0) { 19781da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_SUSPEND) { 19791da177e4SLinus Torvalds clear_port_feature(hdev, port1, 19801da177e4SLinus Torvalds USB_PORT_FEAT_C_SUSPEND); 19811da177e4SLinus Torvalds portchange &= ~USB_PORT_STAT_C_SUSPEND; 19821da177e4SLinus Torvalds } 19831da177e4SLinus Torvalds 19841da177e4SLinus Torvalds /* let khubd handle disconnects etc */ 19851da177e4SLinus Torvalds if (portchange) 19861da177e4SLinus Torvalds continue; 19871da177e4SLinus Torvalds } 19881da177e4SLinus Torvalds 19891da177e4SLinus Torvalds if (!udev || status < 0) 19901da177e4SLinus Torvalds continue; 19911da177e4SLinus Torvalds down (&udev->serialize); 19921da177e4SLinus Torvalds if (portstat & USB_PORT_STAT_SUSPEND) 19931da177e4SLinus Torvalds status = hub_port_resume(hub, port1, udev); 19941da177e4SLinus Torvalds else { 1995f3f3253dSDavid Brownell status = finish_device_resume(udev); 19961da177e4SLinus Torvalds if (status < 0) { 19971da177e4SLinus Torvalds dev_dbg(&intf->dev, "resume port %d --> %d\n", 19981da177e4SLinus Torvalds port1, status); 19991da177e4SLinus Torvalds hub_port_logical_disconnect(hub, port1); 20001da177e4SLinus Torvalds } 20011da177e4SLinus Torvalds } 20021da177e4SLinus Torvalds up(&udev->serialize); 20031da177e4SLinus Torvalds } 2004f3f3253dSDavid Brownell } 2005f3f3253dSDavid Brownell #endif 20061da177e4SLinus Torvalds return 0; 20071da177e4SLinus Torvalds } 20081da177e4SLinus Torvalds 2009979d5199SDavid Brownell void usb_suspend_root_hub(struct usb_device *hdev) 2010979d5199SDavid Brownell { 2011979d5199SDavid Brownell struct usb_hub *hub = hdev_to_hub(hdev); 2012979d5199SDavid Brownell 2013979d5199SDavid Brownell /* This also makes any led blinker stop retriggering. We're called 2014979d5199SDavid Brownell * from irq, so the blinker might still be scheduled. Caller promises 2015979d5199SDavid Brownell * that the root hub status URB will be canceled. 2016979d5199SDavid Brownell */ 2017979d5199SDavid Brownell __hub_quiesce(hub); 2018979d5199SDavid Brownell mark_quiesced(to_usb_interface(hub->intfdev)); 2019979d5199SDavid Brownell } 2020979d5199SDavid Brownell 20211da177e4SLinus Torvalds void usb_resume_root_hub(struct usb_device *hdev) 20221da177e4SLinus Torvalds { 20231da177e4SLinus Torvalds struct usb_hub *hub = hdev_to_hub(hdev); 20241da177e4SLinus Torvalds 20251da177e4SLinus Torvalds hub->resume_root_hub = 1; 20261da177e4SLinus Torvalds kick_khubd(hub); 20271da177e4SLinus Torvalds } 20281da177e4SLinus Torvalds 20291da177e4SLinus Torvalds 20301da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 20311da177e4SLinus Torvalds * 20321da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 20331da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 20341da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 20351da177e4SLinus Torvalds * 20361da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 20371da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 20381da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 20391da177e4SLinus Torvalds * 20401da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 20411da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 20421da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 20431da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 20441da177e4SLinus Torvalds */ 20451da177e4SLinus Torvalds 20461da177e4SLinus Torvalds #define HUB_DEBOUNCE_TIMEOUT 1500 20471da177e4SLinus Torvalds #define HUB_DEBOUNCE_STEP 25 20481da177e4SLinus Torvalds #define HUB_DEBOUNCE_STABLE 100 20491da177e4SLinus Torvalds 20501da177e4SLinus Torvalds static int hub_port_debounce(struct usb_hub *hub, int port1) 20511da177e4SLinus Torvalds { 20521da177e4SLinus Torvalds int ret; 20531da177e4SLinus Torvalds int total_time, stable_time = 0; 20541da177e4SLinus Torvalds u16 portchange, portstatus; 20551da177e4SLinus Torvalds unsigned connection = 0xffff; 20561da177e4SLinus Torvalds 20571da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 20581da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 20591da177e4SLinus Torvalds if (ret < 0) 20601da177e4SLinus Torvalds return ret; 20611da177e4SLinus Torvalds 20621da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 20631da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 20641da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 20651da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 20661da177e4SLinus Torvalds break; 20671da177e4SLinus Torvalds } else { 20681da177e4SLinus Torvalds stable_time = 0; 20691da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 20701da177e4SLinus Torvalds } 20711da177e4SLinus Torvalds 20721da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 20731da177e4SLinus Torvalds clear_port_feature(hub->hdev, port1, 20741da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 20751da177e4SLinus Torvalds } 20761da177e4SLinus Torvalds 20771da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 20781da177e4SLinus Torvalds break; 20791da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 20801da177e4SLinus Torvalds } 20811da177e4SLinus Torvalds 20821da177e4SLinus Torvalds dev_dbg (hub->intfdev, 20831da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 20841da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 20851da177e4SLinus Torvalds 20861da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 20871da177e4SLinus Torvalds return -ETIMEDOUT; 20881da177e4SLinus Torvalds return portstatus; 20891da177e4SLinus Torvalds } 20901da177e4SLinus Torvalds 20911da177e4SLinus Torvalds static void ep0_reinit(struct usb_device *udev) 20921da177e4SLinus Torvalds { 20931da177e4SLinus Torvalds usb_disable_endpoint(udev, 0 + USB_DIR_IN); 20941da177e4SLinus Torvalds usb_disable_endpoint(udev, 0 + USB_DIR_OUT); 20951da177e4SLinus Torvalds udev->ep_in[0] = udev->ep_out[0] = &udev->ep0; 20961da177e4SLinus Torvalds } 20971da177e4SLinus Torvalds 20981da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 20991da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 21001da177e4SLinus Torvalds 21011da177e4SLinus Torvalds static int hub_set_address(struct usb_device *udev) 21021da177e4SLinus Torvalds { 21031da177e4SLinus Torvalds int retval; 21041da177e4SLinus Torvalds 21051da177e4SLinus Torvalds if (udev->devnum == 0) 21061da177e4SLinus Torvalds return -EINVAL; 21071da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 21081da177e4SLinus Torvalds return 0; 21091da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 21101da177e4SLinus Torvalds return -EINVAL; 21111da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 21121da177e4SLinus Torvalds USB_REQ_SET_ADDRESS, 0, udev->devnum, 0, 21131da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 21141da177e4SLinus Torvalds if (retval == 0) { 21151da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 21161da177e4SLinus Torvalds ep0_reinit(udev); 21171da177e4SLinus Torvalds } 21181da177e4SLinus Torvalds return retval; 21191da177e4SLinus Torvalds } 21201da177e4SLinus Torvalds 21211da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 21221da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 21231da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 21241da177e4SLinus Torvalds * 21251da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 21261da177e4SLinus Torvalds * usb_reset_device), the caller must own the device lock. For a 21271da177e4SLinus Torvalds * newly detected device that is not accessible through any global 21281da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 21291da177e4SLinus Torvalds */ 21301da177e4SLinus Torvalds static int 21311da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 21321da177e4SLinus Torvalds int retry_counter) 21331da177e4SLinus Torvalds { 21341da177e4SLinus Torvalds static DECLARE_MUTEX(usb_address0_sem); 21351da177e4SLinus Torvalds 21361da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 21371da177e4SLinus Torvalds int i, j, retval; 21381da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 21391da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 21401da177e4SLinus Torvalds 21411da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 21421da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 21431da177e4SLinus Torvalds */ 21441da177e4SLinus Torvalds if (!hdev->parent) { 21451da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 21461da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 21471da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 21481da177e4SLinus Torvalds } 21491da177e4SLinus Torvalds 21501da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 21511da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 21521da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 21531da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 21541da177e4SLinus Torvalds 21551da177e4SLinus Torvalds down(&usb_address0_sem); 21561da177e4SLinus Torvalds 21571da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 21581da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 21591da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 21601da177e4SLinus Torvalds goto fail; 21611da177e4SLinus Torvalds /* success, speed is known */ 21621da177e4SLinus Torvalds retval = -ENODEV; 21631da177e4SLinus Torvalds 21641da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 21651da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 21661da177e4SLinus Torvalds goto fail; 21671da177e4SLinus Torvalds } 21681da177e4SLinus Torvalds oldspeed = udev->speed; 21691da177e4SLinus Torvalds 21701da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 21711da177e4SLinus Torvalds * it's fixed size except for full speed devices. 21721da177e4SLinus Torvalds */ 21731da177e4SLinus Torvalds switch (udev->speed) { 21741da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 21751da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); 21761da177e4SLinus Torvalds break; 21771da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 21781da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 21791da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 21801da177e4SLinus Torvalds * then correct our initial guess. 21811da177e4SLinus Torvalds */ 21821da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); 21831da177e4SLinus Torvalds break; 21841da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 21851da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8); 21861da177e4SLinus Torvalds break; 21871da177e4SLinus Torvalds default: 21881da177e4SLinus Torvalds goto fail; 21891da177e4SLinus Torvalds } 21901da177e4SLinus Torvalds 21911da177e4SLinus Torvalds dev_info (&udev->dev, 21921da177e4SLinus Torvalds "%s %s speed USB device using %s and address %d\n", 21931da177e4SLinus Torvalds (udev->config) ? "reset" : "new", 21941da177e4SLinus Torvalds ({ char *speed; switch (udev->speed) { 21951da177e4SLinus Torvalds case USB_SPEED_LOW: speed = "low"; break; 21961da177e4SLinus Torvalds case USB_SPEED_FULL: speed = "full"; break; 21971da177e4SLinus Torvalds case USB_SPEED_HIGH: speed = "high"; break; 21981da177e4SLinus Torvalds default: speed = "?"; break; 21991da177e4SLinus Torvalds }; speed;}), 22001da177e4SLinus Torvalds udev->bus->controller->driver->name, 22011da177e4SLinus Torvalds udev->devnum); 22021da177e4SLinus Torvalds 22031da177e4SLinus Torvalds /* Set up TT records, if needed */ 22041da177e4SLinus Torvalds if (hdev->tt) { 22051da177e4SLinus Torvalds udev->tt = hdev->tt; 22061da177e4SLinus Torvalds udev->ttport = hdev->ttport; 22071da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 22081da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 22091da177e4SLinus Torvalds udev->tt = &hub->tt; 22101da177e4SLinus Torvalds udev->ttport = port1; 22111da177e4SLinus Torvalds } 22121da177e4SLinus Torvalds 22131da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 22141da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 22151da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 22161da177e4SLinus Torvalds * Change it cautiously. 22171da177e4SLinus Torvalds * 22181da177e4SLinus Torvalds * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 22191da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 22201da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 22211da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 22221da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 22231da177e4SLinus Torvalds * value. 22241da177e4SLinus Torvalds */ 22251da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 22261da177e4SLinus Torvalds if (USE_NEW_SCHEME(retry_counter)) { 22271da177e4SLinus Torvalds struct usb_device_descriptor *buf; 22281da177e4SLinus Torvalds int r = 0; 22291da177e4SLinus Torvalds 22301da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 22311da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 22321da177e4SLinus Torvalds if (!buf) { 22331da177e4SLinus Torvalds retval = -ENOMEM; 22341da177e4SLinus Torvalds continue; 22351da177e4SLinus Torvalds } 22361da177e4SLinus Torvalds 22371da177e4SLinus Torvalds /* Use a short timeout the first time through, 22381da177e4SLinus Torvalds * so that recalcitrant full-speed devices with 22391da177e4SLinus Torvalds * 8- or 16-byte ep0-maxpackets won't slow things 22401da177e4SLinus Torvalds * down tremendously by NAKing the unexpectedly 22411da177e4SLinus Torvalds * early status stage. Also, retry on all errors; 22421da177e4SLinus Torvalds * some devices are flakey. 22431da177e4SLinus Torvalds */ 22441da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 22451da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 22461da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 22471da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 22481da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 22491da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 22501da177e4SLinus Torvalds (i ? USB_CTRL_GET_TIMEOUT : 1000)); 22511da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 22521da177e4SLinus Torvalds case 8: case 16: case 32: case 64: 22531da177e4SLinus Torvalds if (buf->bDescriptorType == 22541da177e4SLinus Torvalds USB_DT_DEVICE) { 22551da177e4SLinus Torvalds r = 0; 22561da177e4SLinus Torvalds break; 22571da177e4SLinus Torvalds } 22581da177e4SLinus Torvalds /* FALL THROUGH */ 22591da177e4SLinus Torvalds default: 22601da177e4SLinus Torvalds if (r == 0) 22611da177e4SLinus Torvalds r = -EPROTO; 22621da177e4SLinus Torvalds break; 22631da177e4SLinus Torvalds } 22641da177e4SLinus Torvalds if (r == 0) 22651da177e4SLinus Torvalds break; 22661da177e4SLinus Torvalds } 22671da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 22681da177e4SLinus Torvalds buf->bMaxPacketSize0; 22691da177e4SLinus Torvalds kfree(buf); 22701da177e4SLinus Torvalds 22711da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 22721da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 22731da177e4SLinus Torvalds goto fail; 22741da177e4SLinus Torvalds if (oldspeed != udev->speed) { 22751da177e4SLinus Torvalds dev_dbg(&udev->dev, 22761da177e4SLinus Torvalds "device reset changed speed!\n"); 22771da177e4SLinus Torvalds retval = -ENODEV; 22781da177e4SLinus Torvalds goto fail; 22791da177e4SLinus Torvalds } 22801da177e4SLinus Torvalds if (r) { 22811da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor " 22821da177e4SLinus Torvalds "read/%s, error %d\n", 22831da177e4SLinus Torvalds "64", r); 22841da177e4SLinus Torvalds retval = -EMSGSIZE; 22851da177e4SLinus Torvalds continue; 22861da177e4SLinus Torvalds } 22871da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 22881da177e4SLinus Torvalds } 22891da177e4SLinus Torvalds 22901da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 22911da177e4SLinus Torvalds retval = hub_set_address(udev); 22921da177e4SLinus Torvalds if (retval >= 0) 22931da177e4SLinus Torvalds break; 22941da177e4SLinus Torvalds msleep(200); 22951da177e4SLinus Torvalds } 22961da177e4SLinus Torvalds if (retval < 0) { 22971da177e4SLinus Torvalds dev_err(&udev->dev, 22981da177e4SLinus Torvalds "device not accepting address %d, error %d\n", 22991da177e4SLinus Torvalds udev->devnum, retval); 23001da177e4SLinus Torvalds goto fail; 23011da177e4SLinus Torvalds } 23021da177e4SLinus Torvalds 23031da177e4SLinus Torvalds /* cope with hardware quirkiness: 23041da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 23051da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 23061da177e4SLinus Torvalds */ 23071da177e4SLinus Torvalds msleep(10); 23081da177e4SLinus Torvalds if (USE_NEW_SCHEME(retry_counter)) 23091da177e4SLinus Torvalds break; 23101da177e4SLinus Torvalds 23111da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 23121da177e4SLinus Torvalds if (retval < 8) { 23131da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor " 23141da177e4SLinus Torvalds "read/%s, error %d\n", 23151da177e4SLinus Torvalds "8", retval); 23161da177e4SLinus Torvalds if (retval >= 0) 23171da177e4SLinus Torvalds retval = -EMSGSIZE; 23181da177e4SLinus Torvalds } else { 23191da177e4SLinus Torvalds retval = 0; 23201da177e4SLinus Torvalds break; 23211da177e4SLinus Torvalds } 23221da177e4SLinus Torvalds } 23231da177e4SLinus Torvalds if (retval) 23241da177e4SLinus Torvalds goto fail; 23251da177e4SLinus Torvalds 23261da177e4SLinus Torvalds i = udev->descriptor.bMaxPacketSize0; 23271da177e4SLinus Torvalds if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { 23281da177e4SLinus Torvalds if (udev->speed != USB_SPEED_FULL || 23291da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 23301da177e4SLinus Torvalds dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); 23311da177e4SLinus Torvalds retval = -EMSGSIZE; 23321da177e4SLinus Torvalds goto fail; 23331da177e4SLinus Torvalds } 23341da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 23351da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 23361da177e4SLinus Torvalds ep0_reinit(udev); 23371da177e4SLinus Torvalds } 23381da177e4SLinus Torvalds 23391da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 23401da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 23411da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor read/%s, error %d\n", 23421da177e4SLinus Torvalds "all", retval); 23431da177e4SLinus Torvalds if (retval >= 0) 23441da177e4SLinus Torvalds retval = -ENOMSG; 23451da177e4SLinus Torvalds goto fail; 23461da177e4SLinus Torvalds } 23471da177e4SLinus Torvalds 23481da177e4SLinus Torvalds retval = 0; 23491da177e4SLinus Torvalds 23501da177e4SLinus Torvalds fail: 23511da177e4SLinus Torvalds if (retval) 23521da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 23531da177e4SLinus Torvalds up(&usb_address0_sem); 23541da177e4SLinus Torvalds return retval; 23551da177e4SLinus Torvalds } 23561da177e4SLinus Torvalds 23571da177e4SLinus Torvalds static void 23581da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 23591da177e4SLinus Torvalds { 23601da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 23611da177e4SLinus Torvalds int status; 23621da177e4SLinus Torvalds 23631da177e4SLinus Torvalds qual = kmalloc (sizeof *qual, SLAB_KERNEL); 23641da177e4SLinus Torvalds if (qual == NULL) 23651da177e4SLinus Torvalds return; 23661da177e4SLinus Torvalds 23671da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 23681da177e4SLinus Torvalds qual, sizeof *qual); 23691da177e4SLinus Torvalds if (status == sizeof *qual) { 23701da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 23711da177e4SLinus Torvalds "connect to a high speed hub\n"); 23721da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 23731da177e4SLinus Torvalds if (hub->has_indicators) { 23741da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 23751da177e4SLinus Torvalds schedule_work (&hub->leds); 23761da177e4SLinus Torvalds } 23771da177e4SLinus Torvalds } 23781da177e4SLinus Torvalds kfree(qual); 23791da177e4SLinus Torvalds } 23801da177e4SLinus Torvalds 23811da177e4SLinus Torvalds static unsigned 23821da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 23831da177e4SLinus Torvalds { 23841da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 23851da177e4SLinus Torvalds int remaining; 23861da177e4SLinus Torvalds unsigned i; 23871da177e4SLinus Torvalds 23881da177e4SLinus Torvalds remaining = hub->power_budget; 23891da177e4SLinus Torvalds if (!remaining) /* self-powered */ 23901da177e4SLinus Torvalds return 0; 23911da177e4SLinus Torvalds 23921da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) { 23931da177e4SLinus Torvalds struct usb_device *udev = hdev->children[i]; 23941da177e4SLinus Torvalds int delta, ceiling; 23951da177e4SLinus Torvalds 23961da177e4SLinus Torvalds if (!udev) 23971da177e4SLinus Torvalds continue; 23981da177e4SLinus Torvalds 23991da177e4SLinus Torvalds /* 100mA per-port ceiling, or 8mA for OTG ports */ 24001da177e4SLinus Torvalds if (i != (udev->bus->otg_port - 1) || hdev->parent) 24011da177e4SLinus Torvalds ceiling = 50; 24021da177e4SLinus Torvalds else 24031da177e4SLinus Torvalds ceiling = 4; 24041da177e4SLinus Torvalds 24051da177e4SLinus Torvalds if (udev->actconfig) 24061da177e4SLinus Torvalds delta = udev->actconfig->desc.bMaxPower; 24071da177e4SLinus Torvalds else 24081da177e4SLinus Torvalds delta = ceiling; 24091da177e4SLinus Torvalds // dev_dbg(&udev->dev, "budgeted %dmA\n", 2 * delta); 24101da177e4SLinus Torvalds if (delta > ceiling) 24111da177e4SLinus Torvalds dev_warn(&udev->dev, "%dmA over %dmA budget!\n", 24121da177e4SLinus Torvalds 2 * (delta - ceiling), 2 * ceiling); 24131da177e4SLinus Torvalds remaining -= delta; 24141da177e4SLinus Torvalds } 24151da177e4SLinus Torvalds if (remaining < 0) { 24161da177e4SLinus Torvalds dev_warn(hub->intfdev, 24171da177e4SLinus Torvalds "%dmA over power budget!\n", 24181da177e4SLinus Torvalds -2 * remaining); 24191da177e4SLinus Torvalds remaining = 0; 24201da177e4SLinus Torvalds } 24211da177e4SLinus Torvalds return remaining; 24221da177e4SLinus Torvalds } 24231da177e4SLinus Torvalds 24241da177e4SLinus Torvalds /* Handle physical or logical connection change events. 24251da177e4SLinus Torvalds * This routine is called when: 24261da177e4SLinus Torvalds * a port connection-change occurs; 24271da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 24281da177e4SLinus Torvalds * usb_reset_device() encounters changed descriptors (as from 24291da177e4SLinus Torvalds * a firmware download) 24301da177e4SLinus Torvalds * caller already locked the hub 24311da177e4SLinus Torvalds */ 24321da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 24331da177e4SLinus Torvalds u16 portstatus, u16 portchange) 24341da177e4SLinus Torvalds { 24351da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 24361da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 243774ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 24381da177e4SLinus Torvalds int status, i; 24391da177e4SLinus Torvalds 24401da177e4SLinus Torvalds dev_dbg (hub_dev, 24411da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 24421da177e4SLinus Torvalds port1, portstatus, portchange, portspeed (portstatus)); 24431da177e4SLinus Torvalds 24441da177e4SLinus Torvalds if (hub->has_indicators) { 24451da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 24461da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 24471da177e4SLinus Torvalds } 24481da177e4SLinus Torvalds 24491da177e4SLinus Torvalds /* Disconnect any existing devices under this port */ 24501da177e4SLinus Torvalds if (hdev->children[port1-1]) 24511da177e4SLinus Torvalds usb_disconnect(&hdev->children[port1-1]); 24521da177e4SLinus Torvalds clear_bit(port1, hub->change_bits); 24531da177e4SLinus Torvalds 24541da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 24551da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 24561da177e4SLinus Torvalds if (hdev->bus->is_b_host) 24571da177e4SLinus Torvalds portchange &= ~USB_PORT_STAT_C_CONNECTION; 24581da177e4SLinus Torvalds #endif 24591da177e4SLinus Torvalds 24601da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 24611da177e4SLinus Torvalds status = hub_port_debounce(hub, port1); 24621da177e4SLinus Torvalds if (status < 0) { 24631da177e4SLinus Torvalds dev_err (hub_dev, 24641da177e4SLinus Torvalds "connect-debounce failed, port %d disabled\n", 24651da177e4SLinus Torvalds port1); 24661da177e4SLinus Torvalds goto done; 24671da177e4SLinus Torvalds } 24681da177e4SLinus Torvalds portstatus = status; 24691da177e4SLinus Torvalds } 24701da177e4SLinus Torvalds 24711da177e4SLinus Torvalds /* Return now if nothing is connected */ 24721da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) { 24731da177e4SLinus Torvalds 24741da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 247574ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 24761da177e4SLinus Torvalds && !(portstatus & (1 << USB_PORT_FEAT_POWER))) 24771da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 24781da177e4SLinus Torvalds 24791da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 24801da177e4SLinus Torvalds goto done; 24811da177e4SLinus Torvalds return; 24821da177e4SLinus Torvalds } 24831da177e4SLinus Torvalds 24841da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 24851da177e4SLinus Torvalds /* If something is connected, but the port is suspended, wake it up. */ 24861da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_SUSPEND) { 24871da177e4SLinus Torvalds status = hub_port_resume(hub, port1, NULL); 24881da177e4SLinus Torvalds if (status < 0) { 24891da177e4SLinus Torvalds dev_dbg(hub_dev, 24901da177e4SLinus Torvalds "can't clear suspend on port %d; %d\n", 24911da177e4SLinus Torvalds port1, status); 24921da177e4SLinus Torvalds goto done; 24931da177e4SLinus Torvalds } 24941da177e4SLinus Torvalds } 24951da177e4SLinus Torvalds #endif 24961da177e4SLinus Torvalds 24971da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 24981da177e4SLinus Torvalds struct usb_device *udev; 24991da177e4SLinus Torvalds 25001da177e4SLinus Torvalds /* reallocate for each attempt, since references 25011da177e4SLinus Torvalds * to the previous one can escape in various ways 25021da177e4SLinus Torvalds */ 25031da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 25041da177e4SLinus Torvalds if (!udev) { 25051da177e4SLinus Torvalds dev_err (hub_dev, 25061da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 25071da177e4SLinus Torvalds port1); 25081da177e4SLinus Torvalds goto done; 25091da177e4SLinus Torvalds } 25101da177e4SLinus Torvalds 25111da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 25121da177e4SLinus Torvalds udev->speed = USB_SPEED_UNKNOWN; 25131da177e4SLinus Torvalds 25141da177e4SLinus Torvalds /* set the address */ 25151da177e4SLinus Torvalds choose_address(udev); 25161da177e4SLinus Torvalds if (udev->devnum <= 0) { 25171da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 25181da177e4SLinus Torvalds goto loop; 25191da177e4SLinus Torvalds } 25201da177e4SLinus Torvalds 25211da177e4SLinus Torvalds /* reset and get descriptor */ 25221da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 25231da177e4SLinus Torvalds if (status < 0) 25241da177e4SLinus Torvalds goto loop; 25251da177e4SLinus Torvalds 25261da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 25271da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 25281da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 25291da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 25301da177e4SLinus Torvalds * on the parent. 25311da177e4SLinus Torvalds */ 25321da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 25331da177e4SLinus Torvalds && hub->power_budget) { 25341da177e4SLinus Torvalds u16 devstat; 25351da177e4SLinus Torvalds 25361da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 25371da177e4SLinus Torvalds &devstat); 25381da177e4SLinus Torvalds if (status < 0) { 25391da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 25401da177e4SLinus Torvalds goto loop_disable; 25411da177e4SLinus Torvalds } 25421da177e4SLinus Torvalds cpu_to_le16s(&devstat); 25431da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 25441da177e4SLinus Torvalds dev_err(&udev->dev, 25451da177e4SLinus Torvalds "can't connect bus-powered hub " 25461da177e4SLinus Torvalds "to this port\n"); 25471da177e4SLinus Torvalds if (hub->has_indicators) { 25481da177e4SLinus Torvalds hub->indicator[port1-1] = 25491da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 25501da177e4SLinus Torvalds schedule_work (&hub->leds); 25511da177e4SLinus Torvalds } 25521da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 25531da177e4SLinus Torvalds goto loop_disable; 25541da177e4SLinus Torvalds } 25551da177e4SLinus Torvalds } 25561da177e4SLinus Torvalds 25571da177e4SLinus Torvalds /* check for devices running slower than they could */ 25581da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 25591da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 25601da177e4SLinus Torvalds && highspeed_hubs != 0) 25611da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 25621da177e4SLinus Torvalds 25631da177e4SLinus Torvalds /* Store the parent's children[] pointer. At this point 25641da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 25651da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 25661da177e4SLinus Torvalds */ 25671da177e4SLinus Torvalds down (&udev->serialize); 25681da177e4SLinus Torvalds status = 0; 25691da177e4SLinus Torvalds 25701da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 25711da177e4SLinus Torvalds * been disconnected; we would race with the 25721da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 25731da177e4SLinus Torvalds */ 25741da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 25751da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 25761da177e4SLinus Torvalds status = -ENOTCONN; 25771da177e4SLinus Torvalds else 25781da177e4SLinus Torvalds hdev->children[port1-1] = udev; 25791da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 25801da177e4SLinus Torvalds 25811da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 25821da177e4SLinus Torvalds if (!status) { 25831da177e4SLinus Torvalds status = usb_new_device(udev); 25841da177e4SLinus Torvalds if (status) { 25851da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 25861da177e4SLinus Torvalds hdev->children[port1-1] = NULL; 25871da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 25881da177e4SLinus Torvalds } 25891da177e4SLinus Torvalds } 25901da177e4SLinus Torvalds 25911da177e4SLinus Torvalds up (&udev->serialize); 25921da177e4SLinus Torvalds if (status) 25931da177e4SLinus Torvalds goto loop_disable; 25941da177e4SLinus Torvalds 25951da177e4SLinus Torvalds status = hub_power_remaining(hub); 25961da177e4SLinus Torvalds if (status) 25971da177e4SLinus Torvalds dev_dbg(hub_dev, 25981da177e4SLinus Torvalds "%dmA power budget left\n", 25991da177e4SLinus Torvalds 2 * status); 26001da177e4SLinus Torvalds 26011da177e4SLinus Torvalds return; 26021da177e4SLinus Torvalds 26031da177e4SLinus Torvalds loop_disable: 26041da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 26051da177e4SLinus Torvalds loop: 26061da177e4SLinus Torvalds ep0_reinit(udev); 26071da177e4SLinus Torvalds release_address(udev); 26081da177e4SLinus Torvalds usb_put_dev(udev); 26091da177e4SLinus Torvalds if (status == -ENOTCONN) 26101da177e4SLinus Torvalds break; 26111da177e4SLinus Torvalds } 26121da177e4SLinus Torvalds 26131da177e4SLinus Torvalds done: 26141da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 26151da177e4SLinus Torvalds } 26161da177e4SLinus Torvalds 26171da177e4SLinus Torvalds static void hub_events(void) 26181da177e4SLinus Torvalds { 26191da177e4SLinus Torvalds struct list_head *tmp; 26201da177e4SLinus Torvalds struct usb_device *hdev; 26211da177e4SLinus Torvalds struct usb_interface *intf; 26221da177e4SLinus Torvalds struct usb_hub *hub; 26231da177e4SLinus Torvalds struct device *hub_dev; 26241da177e4SLinus Torvalds u16 hubstatus; 26251da177e4SLinus Torvalds u16 hubchange; 26261da177e4SLinus Torvalds u16 portstatus; 26271da177e4SLinus Torvalds u16 portchange; 26281da177e4SLinus Torvalds int i, ret; 26291da177e4SLinus Torvalds int connect_change; 26301da177e4SLinus Torvalds 26311da177e4SLinus Torvalds /* 26321da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 26331da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 26341da177e4SLinus Torvalds * safe since we delete the hub from the event list. 26351da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 26361da177e4SLinus Torvalds */ 26371da177e4SLinus Torvalds while (1) { 26381da177e4SLinus Torvalds 26391da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 26401da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 26411da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 26421da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 26431da177e4SLinus Torvalds break; 26441da177e4SLinus Torvalds } 26451da177e4SLinus Torvalds 26461da177e4SLinus Torvalds tmp = hub_event_list.next; 26471da177e4SLinus Torvalds list_del_init(tmp); 26481da177e4SLinus Torvalds 26491da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 26501da177e4SLinus Torvalds hdev = hub->hdev; 26511da177e4SLinus Torvalds intf = to_usb_interface(hub->intfdev); 26521da177e4SLinus Torvalds hub_dev = &intf->dev; 26531da177e4SLinus Torvalds 2654979d5199SDavid Brownell i = hub->resume_root_hub; 2655979d5199SDavid Brownell 2656979d5199SDavid Brownell dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n", 26571da177e4SLinus Torvalds hdev->state, hub->descriptor 26581da177e4SLinus Torvalds ? hub->descriptor->bNbrPorts 26591da177e4SLinus Torvalds : 0, 26601da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 26611da177e4SLinus Torvalds (u16) hub->change_bits[0], 2662979d5199SDavid Brownell (u16) hub->event_bits[0], 2663979d5199SDavid Brownell i ? ", resume root" : ""); 26641da177e4SLinus Torvalds 26651da177e4SLinus Torvalds usb_get_intf(intf); 26661da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 26671da177e4SLinus Torvalds 2668979d5199SDavid Brownell /* Is this is a root hub wanting to reactivate the downstream 2669979d5199SDavid Brownell * ports? If so, be sure the interface resumes even if its 2670979d5199SDavid Brownell * stub "device" node was never suspended. 2671979d5199SDavid Brownell */ 2672979d5199SDavid Brownell if (i) { 2673979d5199SDavid Brownell extern void dpm_runtime_resume(struct device *); 2674979d5199SDavid Brownell 2675979d5199SDavid Brownell dpm_runtime_resume(&hdev->dev); 2676979d5199SDavid Brownell dpm_runtime_resume(&intf->dev); 2677979d5199SDavid Brownell } 26781da177e4SLinus Torvalds 26791da177e4SLinus Torvalds /* Lock the device, then check to see if we were 26801da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 26811da177e4SLinus Torvalds if (locktree(hdev) < 0) { 26821da177e4SLinus Torvalds usb_put_intf(intf); 26831da177e4SLinus Torvalds continue; 26841da177e4SLinus Torvalds } 26851da177e4SLinus Torvalds if (hub != usb_get_intfdata(intf)) 26861da177e4SLinus Torvalds goto loop; 26871da177e4SLinus Torvalds 26881da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 26891da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 26901da177e4SLinus Torvalds hub_pre_reset(hub); 26911da177e4SLinus Torvalds goto loop; 26921da177e4SLinus Torvalds } 26931da177e4SLinus Torvalds 26941da177e4SLinus Torvalds /* If this is an inactive or suspended hub, do nothing */ 26951da177e4SLinus Torvalds if (hub->quiescing) 26961da177e4SLinus Torvalds goto loop; 26971da177e4SLinus Torvalds 26981da177e4SLinus Torvalds if (hub->error) { 26991da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 27001da177e4SLinus Torvalds hub->error); 27011da177e4SLinus Torvalds 27021da177e4SLinus Torvalds ret = usb_reset_device(hdev); 27031da177e4SLinus Torvalds if (ret) { 27041da177e4SLinus Torvalds dev_dbg (hub_dev, 27051da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 27061da177e4SLinus Torvalds goto loop; 27071da177e4SLinus Torvalds } 27081da177e4SLinus Torvalds 27091da177e4SLinus Torvalds hub->nerrors = 0; 27101da177e4SLinus Torvalds hub->error = 0; 27111da177e4SLinus Torvalds } 27121da177e4SLinus Torvalds 27131da177e4SLinus Torvalds /* deal with port status changes */ 27141da177e4SLinus Torvalds for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { 27151da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 27161da177e4SLinus Torvalds continue; 27171da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 27181da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 27191da177e4SLinus Torvalds !connect_change && !hub->activating) 27201da177e4SLinus Torvalds continue; 27211da177e4SLinus Torvalds 27221da177e4SLinus Torvalds ret = hub_port_status(hub, i, 27231da177e4SLinus Torvalds &portstatus, &portchange); 27241da177e4SLinus Torvalds if (ret < 0) 27251da177e4SLinus Torvalds continue; 27261da177e4SLinus Torvalds 27271da177e4SLinus Torvalds if (hub->activating && !hdev->children[i-1] && 27281da177e4SLinus Torvalds (portstatus & 27291da177e4SLinus Torvalds USB_PORT_STAT_CONNECTION)) 27301da177e4SLinus Torvalds connect_change = 1; 27311da177e4SLinus Torvalds 27321da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 27331da177e4SLinus Torvalds clear_port_feature(hdev, i, 27341da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 27351da177e4SLinus Torvalds connect_change = 1; 27361da177e4SLinus Torvalds } 27371da177e4SLinus Torvalds 27381da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 27391da177e4SLinus Torvalds if (!connect_change) 27401da177e4SLinus Torvalds dev_dbg (hub_dev, 27411da177e4SLinus Torvalds "port %d enable change, " 27421da177e4SLinus Torvalds "status %08x\n", 27431da177e4SLinus Torvalds i, portstatus); 27441da177e4SLinus Torvalds clear_port_feature(hdev, i, 27451da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 27461da177e4SLinus Torvalds 27471da177e4SLinus Torvalds /* 27481da177e4SLinus Torvalds * EM interference sometimes causes badly 27491da177e4SLinus Torvalds * shielded USB devices to be shutdown by 27501da177e4SLinus Torvalds * the hub, this hack enables them again. 27511da177e4SLinus Torvalds * Works at least with mouse driver. 27521da177e4SLinus Torvalds */ 27531da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 27541da177e4SLinus Torvalds && !connect_change 27551da177e4SLinus Torvalds && hdev->children[i-1]) { 27561da177e4SLinus Torvalds dev_err (hub_dev, 27571da177e4SLinus Torvalds "port %i " 27581da177e4SLinus Torvalds "disabled by hub (EMI?), " 27591da177e4SLinus Torvalds "re-enabling...\n", 27601da177e4SLinus Torvalds i); 27611da177e4SLinus Torvalds connect_change = 1; 27621da177e4SLinus Torvalds } 27631da177e4SLinus Torvalds } 27641da177e4SLinus Torvalds 27651da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_SUSPEND) { 27661da177e4SLinus Torvalds clear_port_feature(hdev, i, 27671da177e4SLinus Torvalds USB_PORT_FEAT_C_SUSPEND); 27681da177e4SLinus Torvalds if (hdev->children[i-1]) { 27691da177e4SLinus Torvalds ret = remote_wakeup(hdev-> 27701da177e4SLinus Torvalds children[i-1]); 27711da177e4SLinus Torvalds if (ret < 0) 27721da177e4SLinus Torvalds connect_change = 1; 27731da177e4SLinus Torvalds } else { 27741da177e4SLinus Torvalds ret = -ENODEV; 27751da177e4SLinus Torvalds hub_port_disable(hub, i, 1); 27761da177e4SLinus Torvalds } 27771da177e4SLinus Torvalds dev_dbg (hub_dev, 27781da177e4SLinus Torvalds "resume on port %d, status %d\n", 27791da177e4SLinus Torvalds i, ret); 27801da177e4SLinus Torvalds } 27811da177e4SLinus Torvalds 27821da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 27831da177e4SLinus Torvalds dev_err (hub_dev, 27841da177e4SLinus Torvalds "over-current change on port %d\n", 27851da177e4SLinus Torvalds i); 27861da177e4SLinus Torvalds clear_port_feature(hdev, i, 27871da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 27881da177e4SLinus Torvalds hub_power_on(hub); 27891da177e4SLinus Torvalds } 27901da177e4SLinus Torvalds 27911da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 27921da177e4SLinus Torvalds dev_dbg (hub_dev, 27931da177e4SLinus Torvalds "reset change on port %d\n", 27941da177e4SLinus Torvalds i); 27951da177e4SLinus Torvalds clear_port_feature(hdev, i, 27961da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 27971da177e4SLinus Torvalds } 27981da177e4SLinus Torvalds 27991da177e4SLinus Torvalds if (connect_change) 28001da177e4SLinus Torvalds hub_port_connect_change(hub, i, 28011da177e4SLinus Torvalds portstatus, portchange); 28021da177e4SLinus Torvalds } /* end for i */ 28031da177e4SLinus Torvalds 28041da177e4SLinus Torvalds /* deal with hub status changes */ 28051da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 28061da177e4SLinus Torvalds ; /* do nothing */ 28071da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 28081da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 28091da177e4SLinus Torvalds else { 28101da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 28111da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 28121da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 28131da177e4SLinus Torvalds } 28141da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 28151da177e4SLinus Torvalds dev_dbg (hub_dev, "overcurrent change\n"); 28161da177e4SLinus Torvalds msleep(500); /* Cool down */ 28171da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 28181da177e4SLinus Torvalds hub_power_on(hub); 28191da177e4SLinus Torvalds } 28201da177e4SLinus Torvalds } 28211da177e4SLinus Torvalds 28221da177e4SLinus Torvalds hub->activating = 0; 28231da177e4SLinus Torvalds 2824d5926ae7SAlan Stern /* If this is a root hub, tell the HCD it's okay to 2825d5926ae7SAlan Stern * re-enable port-change interrupts now. */ 2826d5926ae7SAlan Stern if (!hdev->parent) 2827d5926ae7SAlan Stern usb_enable_root_hub_irq(hdev->bus); 2828d5926ae7SAlan Stern 28291da177e4SLinus Torvalds loop: 28301da177e4SLinus Torvalds usb_unlock_device(hdev); 28311da177e4SLinus Torvalds usb_put_intf(intf); 28321da177e4SLinus Torvalds 28331da177e4SLinus Torvalds } /* end while (1) */ 28341da177e4SLinus Torvalds } 28351da177e4SLinus Torvalds 28361da177e4SLinus Torvalds static int hub_thread(void *__unused) 28371da177e4SLinus Torvalds { 28381da177e4SLinus Torvalds do { 28391da177e4SLinus Torvalds hub_events(); 28409c8d6178Sakpm@osdl.org wait_event_interruptible(khubd_wait, 28419c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 28429c8d6178Sakpm@osdl.org kthread_should_stop()); 28433e1d1d28SChristoph Lameter try_to_freeze(); 28449c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 28451da177e4SLinus Torvalds 28461da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 28479c8d6178Sakpm@osdl.org return 0; 28481da177e4SLinus Torvalds } 28491da177e4SLinus Torvalds 28501da177e4SLinus Torvalds static struct usb_device_id hub_id_table [] = { 28511da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 28521da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 28531da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 28541da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 28551da177e4SLinus Torvalds { } /* Terminating entry */ 28561da177e4SLinus Torvalds }; 28571da177e4SLinus Torvalds 28581da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 28591da177e4SLinus Torvalds 28601da177e4SLinus Torvalds static struct usb_driver hub_driver = { 28611da177e4SLinus Torvalds .owner = THIS_MODULE, 28621da177e4SLinus Torvalds .name = "hub", 28631da177e4SLinus Torvalds .probe = hub_probe, 28641da177e4SLinus Torvalds .disconnect = hub_disconnect, 28651da177e4SLinus Torvalds .suspend = hub_suspend, 28661da177e4SLinus Torvalds .resume = hub_resume, 28671da177e4SLinus Torvalds .ioctl = hub_ioctl, 28681da177e4SLinus Torvalds .id_table = hub_id_table, 28691da177e4SLinus Torvalds }; 28701da177e4SLinus Torvalds 28711da177e4SLinus Torvalds int usb_hub_init(void) 28721da177e4SLinus Torvalds { 28731da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 28741da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 28751da177e4SLinus Torvalds usbcore_name); 28761da177e4SLinus Torvalds return -1; 28771da177e4SLinus Torvalds } 28781da177e4SLinus Torvalds 28799c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 28809c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 28811da177e4SLinus Torvalds return 0; 28821da177e4SLinus Torvalds 28831da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 28841da177e4SLinus Torvalds usb_deregister(&hub_driver); 28851da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 28861da177e4SLinus Torvalds 28871da177e4SLinus Torvalds return -1; 28881da177e4SLinus Torvalds } 28891da177e4SLinus Torvalds 28901da177e4SLinus Torvalds void usb_hub_cleanup(void) 28911da177e4SLinus Torvalds { 28929c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 28931da177e4SLinus Torvalds 28941da177e4SLinus Torvalds /* 28951da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 28961da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 28971da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 28981da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 28991da177e4SLinus Torvalds * individual hub resources. -greg 29001da177e4SLinus Torvalds */ 29011da177e4SLinus Torvalds usb_deregister(&hub_driver); 29021da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 29031da177e4SLinus Torvalds 29041da177e4SLinus Torvalds static int config_descriptors_changed(struct usb_device *udev) 29051da177e4SLinus Torvalds { 29061da177e4SLinus Torvalds unsigned index; 29071da177e4SLinus Torvalds unsigned len = 0; 29081da177e4SLinus Torvalds struct usb_config_descriptor *buf; 29091da177e4SLinus Torvalds 29101da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 29111da177e4SLinus Torvalds if (len < le16_to_cpu(udev->config[index].desc.wTotalLength)) 29121da177e4SLinus Torvalds len = le16_to_cpu(udev->config[index].desc.wTotalLength); 29131da177e4SLinus Torvalds } 29141da177e4SLinus Torvalds buf = kmalloc (len, SLAB_KERNEL); 29151da177e4SLinus Torvalds if (buf == NULL) { 29161da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 29171da177e4SLinus Torvalds /* assume the worst */ 29181da177e4SLinus Torvalds return 1; 29191da177e4SLinus Torvalds } 29201da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 29211da177e4SLinus Torvalds int length; 29221da177e4SLinus Torvalds int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 29231da177e4SLinus Torvalds 29241da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 29251da177e4SLinus Torvalds old_length); 29261da177e4SLinus Torvalds if (length < old_length) { 29271da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 29281da177e4SLinus Torvalds index, length); 29291da177e4SLinus Torvalds break; 29301da177e4SLinus Torvalds } 29311da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 29321da177e4SLinus Torvalds != 0) { 29331da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 29341da177e4SLinus Torvalds index, buf->bConfigurationValue); 29351da177e4SLinus Torvalds break; 29361da177e4SLinus Torvalds } 29371da177e4SLinus Torvalds } 29381da177e4SLinus Torvalds kfree(buf); 29391da177e4SLinus Torvalds return index != udev->descriptor.bNumConfigurations; 29401da177e4SLinus Torvalds } 29411da177e4SLinus Torvalds 29421da177e4SLinus Torvalds /** 29431da177e4SLinus Torvalds * usb_reset_device - perform a USB port reset to reinitialize a device 29441da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 29451da177e4SLinus Torvalds * 29461da177e4SLinus Torvalds * WARNING - don't reset any device unless drivers for all of its 29471da177e4SLinus Torvalds * interfaces are expecting that reset! Maybe some driver->reset() 29481da177e4SLinus Torvalds * method should eventually help ensure sufficient cooperation. 29491da177e4SLinus Torvalds * 29501da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 29511da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 29521da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 29531da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 29541da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 29551da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 29561da177e4SLinus Torvalds * re-enumerated and probed all over again. 29571da177e4SLinus Torvalds * 29581da177e4SLinus Torvalds * Returns 0 if the reset succeeded, -ENODEV if the device has been 29591da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 29601da177e4SLinus Torvalds * if the reset wasn't even attempted. 29611da177e4SLinus Torvalds * 29621da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 29631da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 29641da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 29651da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 29661da177e4SLinus Torvalds */ 29671da177e4SLinus Torvalds int usb_reset_device(struct usb_device *udev) 29681da177e4SLinus Torvalds { 29691da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 29701da177e4SLinus Torvalds struct usb_hub *parent_hub; 29711da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 29721da177e4SLinus Torvalds struct usb_hub *hub = NULL; 29731da177e4SLinus Torvalds int i, ret = 0, port1 = -1; 29741da177e4SLinus Torvalds 29751da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 29761da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 29771da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 29781da177e4SLinus Torvalds udev->state); 29791da177e4SLinus Torvalds return -EINVAL; 29801da177e4SLinus Torvalds } 29811da177e4SLinus Torvalds 29821da177e4SLinus Torvalds if (!parent_hdev) { 29831da177e4SLinus Torvalds /* this requires hcd-specific logic; see OHCI hc_restart() */ 29841da177e4SLinus Torvalds dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__); 29851da177e4SLinus Torvalds return -EISDIR; 29861da177e4SLinus Torvalds } 29871da177e4SLinus Torvalds 29881da177e4SLinus Torvalds for (i = 0; i < parent_hdev->maxchild; i++) 29891da177e4SLinus Torvalds if (parent_hdev->children[i] == udev) { 29901da177e4SLinus Torvalds port1 = i + 1; 29911da177e4SLinus Torvalds break; 29921da177e4SLinus Torvalds } 29931da177e4SLinus Torvalds 29941da177e4SLinus Torvalds if (port1 < 0) { 29951da177e4SLinus Torvalds /* If this ever happens, it's very bad */ 29961da177e4SLinus Torvalds dev_err(&udev->dev, "Can't locate device's port!\n"); 29971da177e4SLinus Torvalds return -ENOENT; 29981da177e4SLinus Torvalds } 29991da177e4SLinus Torvalds parent_hub = hdev_to_hub(parent_hdev); 30001da177e4SLinus Torvalds 30011da177e4SLinus Torvalds /* If we're resetting an active hub, take some special actions */ 30021da177e4SLinus Torvalds if (udev->actconfig && 30031da177e4SLinus Torvalds udev->actconfig->interface[0]->dev.driver == 30041da177e4SLinus Torvalds &hub_driver.driver && 30051da177e4SLinus Torvalds (hub = hdev_to_hub(udev)) != NULL) { 30061da177e4SLinus Torvalds hub_pre_reset(hub); 30071da177e4SLinus Torvalds } 30081da177e4SLinus Torvalds 30091da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 30101da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 30111da177e4SLinus Torvalds 30121da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 30131da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 30141da177e4SLinus Torvalds ep0_reinit(udev); 30151da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 30161da177e4SLinus Torvalds if (ret >= 0) 30171da177e4SLinus Torvalds break; 30181da177e4SLinus Torvalds } 30191da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 30201da177e4SLinus Torvalds if (ret < 0) 30211da177e4SLinus Torvalds goto re_enumerate; 30221da177e4SLinus Torvalds 30231da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 30241da177e4SLinus Torvalds if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor) 30251da177e4SLinus Torvalds || config_descriptors_changed (udev)) { 30261da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 30271da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 30281da177e4SLinus Torvalds goto re_enumerate; 30291da177e4SLinus Torvalds } 30301da177e4SLinus Torvalds 30311da177e4SLinus Torvalds if (!udev->actconfig) 30321da177e4SLinus Torvalds goto done; 30331da177e4SLinus Torvalds 30341da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 30351da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 30361da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 30371da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 30381da177e4SLinus Torvalds if (ret < 0) { 30391da177e4SLinus Torvalds dev_err(&udev->dev, 30401da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 30411da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 30421da177e4SLinus Torvalds goto re_enumerate; 30431da177e4SLinus Torvalds } 30441da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 30451da177e4SLinus Torvalds 30461da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 30471da177e4SLinus Torvalds struct usb_interface *intf = udev->actconfig->interface[i]; 30481da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 30491da177e4SLinus Torvalds 30501da177e4SLinus Torvalds /* set_interface resets host side toggle even 30511da177e4SLinus Torvalds * for altsetting zero. the interface may have no driver. 30521da177e4SLinus Torvalds */ 30531da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 30541da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 30551da177e4SLinus Torvalds desc->bAlternateSetting); 30561da177e4SLinus Torvalds if (ret < 0) { 30571da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 30581da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 30591da177e4SLinus Torvalds desc->bInterfaceNumber, 30601da177e4SLinus Torvalds desc->bAlternateSetting, 30611da177e4SLinus Torvalds ret); 30621da177e4SLinus Torvalds goto re_enumerate; 30631da177e4SLinus Torvalds } 30641da177e4SLinus Torvalds } 30651da177e4SLinus Torvalds 30661da177e4SLinus Torvalds done: 30671da177e4SLinus Torvalds if (hub) 30681da177e4SLinus Torvalds hub_post_reset(hub); 30691da177e4SLinus Torvalds return 0; 30701da177e4SLinus Torvalds 30711da177e4SLinus Torvalds re_enumerate: 30721da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 30731da177e4SLinus Torvalds return -ENODEV; 30741da177e4SLinus Torvalds } 3075