11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * USB hub driver. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * (C) Copyright 1999 Linus Torvalds 51da177e4SLinus Torvalds * (C) Copyright 1999 Johannes Erdfelt 61da177e4SLinus Torvalds * (C) Copyright 1999 Gregory P. Smith 71da177e4SLinus Torvalds * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds 111da177e4SLinus Torvalds #include <linux/kernel.h> 121da177e4SLinus Torvalds #include <linux/errno.h> 131da177e4SLinus Torvalds #include <linux/module.h> 141da177e4SLinus Torvalds #include <linux/moduleparam.h> 151da177e4SLinus Torvalds #include <linux/completion.h> 161da177e4SLinus Torvalds #include <linux/sched.h> 171da177e4SLinus Torvalds #include <linux/list.h> 181da177e4SLinus Torvalds #include <linux/slab.h> 191da177e4SLinus Torvalds #include <linux/smp_lock.h> 201da177e4SLinus Torvalds #include <linux/ioctl.h> 211da177e4SLinus Torvalds #include <linux/usb.h> 221da177e4SLinus Torvalds #include <linux/usbdevice_fs.h> 239c8d6178Sakpm@osdl.org #include <linux/kthread.h> 244186ecf8SArjan van de Ven #include <linux/mutex.h> 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #include <asm/semaphore.h> 271da177e4SLinus Torvalds #include <asm/uaccess.h> 281da177e4SLinus Torvalds #include <asm/byteorder.h> 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds #include "usb.h" 311da177e4SLinus Torvalds #include "hcd.h" 321da177e4SLinus Torvalds #include "hub.h" 331da177e4SLinus Torvalds 341bb5f66bSAlan Stern struct usb_hub { 351bb5f66bSAlan Stern struct device *intfdev; /* the "interface" device */ 361bb5f66bSAlan Stern struct usb_device *hdev; 371bb5f66bSAlan Stern struct urb *urb; /* for interrupt polling pipe */ 381bb5f66bSAlan Stern 391bb5f66bSAlan Stern /* buffer for urb ... with extra space in case of babble */ 401bb5f66bSAlan Stern char (*buffer)[8]; 411bb5f66bSAlan Stern dma_addr_t buffer_dma; /* DMA address for buffer */ 421bb5f66bSAlan Stern union { 431bb5f66bSAlan Stern struct usb_hub_status hub; 441bb5f66bSAlan Stern struct usb_port_status port; 451bb5f66bSAlan Stern } *status; /* buffer for status reports */ 461bb5f66bSAlan Stern 471bb5f66bSAlan Stern int error; /* last reported error */ 481bb5f66bSAlan Stern int nerrors; /* track consecutive errors */ 491bb5f66bSAlan Stern 501bb5f66bSAlan Stern struct list_head event_list; /* hubs w/data or errs ready */ 511bb5f66bSAlan Stern unsigned long event_bits[1]; /* status change bitmask */ 521bb5f66bSAlan Stern unsigned long change_bits[1]; /* ports with logical connect 531bb5f66bSAlan Stern status change */ 541bb5f66bSAlan Stern unsigned long busy_bits[1]; /* ports being reset or 551bb5f66bSAlan Stern resumed */ 561bb5f66bSAlan Stern #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ 571bb5f66bSAlan Stern #error event_bits[] is too short! 581bb5f66bSAlan Stern #endif 591bb5f66bSAlan Stern 601bb5f66bSAlan Stern struct usb_hub_descriptor *descriptor; /* class descriptor */ 611bb5f66bSAlan Stern struct usb_tt tt; /* Transaction Translator */ 621bb5f66bSAlan Stern 631bb5f66bSAlan Stern unsigned mA_per_port; /* current for each child */ 641bb5f66bSAlan Stern 651bb5f66bSAlan Stern unsigned limited_power:1; 661bb5f66bSAlan Stern unsigned quiescing:1; 671bb5f66bSAlan Stern unsigned activating:1; 681bb5f66bSAlan Stern unsigned resume_root_hub:1; 691bb5f66bSAlan Stern 701bb5f66bSAlan Stern unsigned has_indicators:1; 711bb5f66bSAlan Stern u8 indicator[USB_MAXCHILDREN]; 721bb5f66bSAlan Stern struct work_struct leds; 731bb5f66bSAlan Stern }; 741bb5f66bSAlan Stern 751bb5f66bSAlan Stern 761da177e4SLinus Torvalds /* Protect struct usb_device->state and ->children members 779ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 781da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 791da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds /* khubd's worklist and its lock */ 821da177e4SLinus Torvalds static DEFINE_SPINLOCK(hub_event_lock); 831da177e4SLinus Torvalds static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ 841da177e4SLinus Torvalds 851da177e4SLinus Torvalds /* Wakes up khubd */ 861da177e4SLinus Torvalds static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); 871da177e4SLinus Torvalds 889c8d6178Sakpm@osdl.org static struct task_struct *khubd_task; 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 911da177e4SLinus Torvalds static int blinkenlights = 0; 921da177e4SLinus Torvalds module_param (blinkenlights, bool, S_IRUGO); 931da177e4SLinus Torvalds MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds /* 961da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 971da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 981da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 991da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 1001da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 1011da177e4SLinus Torvalds * following module parameters. 1021da177e4SLinus Torvalds * 1031da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 1041da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 1051da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 1061da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 1071da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 1081da177e4SLinus Torvalds */ 1091da177e4SLinus Torvalds static int old_scheme_first = 0; 1101da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 1111da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 1121da177e4SLinus Torvalds "start with the old device initialization scheme"); 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds static int use_both_schemes = 1; 1151da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 1161da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 1171da177e4SLinus Torvalds "try the other device initialization scheme if the " 1181da177e4SLinus Torvalds "first one fails"); 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds #ifdef DEBUG 1221da177e4SLinus Torvalds static inline char *portspeed (int portstatus) 1231da177e4SLinus Torvalds { 1241da177e4SLinus Torvalds if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) 1251da177e4SLinus Torvalds return "480 Mb/s"; 1261da177e4SLinus Torvalds else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) 1271da177e4SLinus Torvalds return "1.5 Mb/s"; 1281da177e4SLinus Torvalds else 1291da177e4SLinus Torvalds return "12 Mb/s"; 1301da177e4SLinus Torvalds } 1311da177e4SLinus Torvalds #endif 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 1341da177e4SLinus Torvalds static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev) 1351da177e4SLinus Torvalds { 1361da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 1401da177e4SLinus Torvalds static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) 1411da177e4SLinus Torvalds { 1421da177e4SLinus Torvalds int i, ret; 1431da177e4SLinus Torvalds 1441da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 1451da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 1461da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 1471da177e4SLinus Torvalds USB_DT_HUB << 8, 0, data, size, 1481da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 1491da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 1501da177e4SLinus Torvalds return ret; 1511da177e4SLinus Torvalds } 1521da177e4SLinus Torvalds return -EINVAL; 1531da177e4SLinus Torvalds } 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds /* 1561da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 1571da177e4SLinus Torvalds */ 1581da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 1591da177e4SLinus Torvalds { 1601da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1611da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 1621da177e4SLinus Torvalds } 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds /* 1651da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 1661da177e4SLinus Torvalds */ 1671da177e4SLinus Torvalds static int clear_port_feature(struct usb_device *hdev, int port1, int feature) 1681da177e4SLinus Torvalds { 1691da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1701da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 1711da177e4SLinus Torvalds NULL, 0, 1000); 1721da177e4SLinus Torvalds } 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds /* 1751da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 1761da177e4SLinus Torvalds */ 1771da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 1781da177e4SLinus Torvalds { 1791da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1801da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 1811da177e4SLinus Torvalds NULL, 0, 1000); 1821da177e4SLinus Torvalds } 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds /* 1851da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 1861da177e4SLinus Torvalds * for info about using port indicators 1871da177e4SLinus Torvalds */ 1881da177e4SLinus Torvalds static void set_port_led( 1891da177e4SLinus Torvalds struct usb_hub *hub, 1901da177e4SLinus Torvalds int port1, 1911da177e4SLinus Torvalds int selector 1921da177e4SLinus Torvalds ) 1931da177e4SLinus Torvalds { 1941da177e4SLinus Torvalds int status = set_port_feature(hub->hdev, (selector << 8) | port1, 1951da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 1961da177e4SLinus Torvalds if (status < 0) 1971da177e4SLinus Torvalds dev_dbg (hub->intfdev, 1981da177e4SLinus Torvalds "port %d indicator %s status %d\n", 1991da177e4SLinus Torvalds port1, 2001da177e4SLinus Torvalds ({ char *s; switch (selector) { 2011da177e4SLinus Torvalds case HUB_LED_AMBER: s = "amber"; break; 2021da177e4SLinus Torvalds case HUB_LED_GREEN: s = "green"; break; 2031da177e4SLinus Torvalds case HUB_LED_OFF: s = "off"; break; 2041da177e4SLinus Torvalds case HUB_LED_AUTO: s = "auto"; break; 2051da177e4SLinus Torvalds default: s = "??"; break; 2061da177e4SLinus Torvalds }; s; }), 2071da177e4SLinus Torvalds status); 2081da177e4SLinus Torvalds } 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds static void led_work (void *__hub) 2131da177e4SLinus Torvalds { 2141da177e4SLinus Torvalds struct usb_hub *hub = __hub; 2151da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 2161da177e4SLinus Torvalds unsigned i; 2171da177e4SLinus Torvalds unsigned changed = 0; 2181da177e4SLinus Torvalds int cursor = -1; 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 2211da177e4SLinus Torvalds return; 2221da177e4SLinus Torvalds 2231da177e4SLinus Torvalds for (i = 0; i < hub->descriptor->bNbrPorts; i++) { 2241da177e4SLinus Torvalds unsigned selector, mode; 2251da177e4SLinus Torvalds 2261da177e4SLinus Torvalds /* 30%-50% duty cycle */ 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds switch (hub->indicator[i]) { 2291da177e4SLinus Torvalds /* cycle marker */ 2301da177e4SLinus Torvalds case INDICATOR_CYCLE: 2311da177e4SLinus Torvalds cursor = i; 2321da177e4SLinus Torvalds selector = HUB_LED_AUTO; 2331da177e4SLinus Torvalds mode = INDICATOR_AUTO; 2341da177e4SLinus Torvalds break; 2351da177e4SLinus Torvalds /* blinking green = sw attention */ 2361da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 2371da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2381da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 2391da177e4SLinus Torvalds break; 2401da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 2411da177e4SLinus Torvalds selector = HUB_LED_OFF; 2421da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 2431da177e4SLinus Torvalds break; 2441da177e4SLinus Torvalds /* blinking amber = hw attention */ 2451da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 2461da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2471da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 2481da177e4SLinus Torvalds break; 2491da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 2501da177e4SLinus Torvalds selector = HUB_LED_OFF; 2511da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 2521da177e4SLinus Torvalds break; 2531da177e4SLinus Torvalds /* blink green/amber = reserved */ 2541da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 2551da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2561da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 2571da177e4SLinus Torvalds break; 2581da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 2591da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2601da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 2611da177e4SLinus Torvalds break; 2621da177e4SLinus Torvalds default: 2631da177e4SLinus Torvalds continue; 2641da177e4SLinus Torvalds } 2651da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 2661da177e4SLinus Torvalds changed = 1; 2671da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 2681da177e4SLinus Torvalds hub->indicator[i] = mode; 2691da177e4SLinus Torvalds } 2701da177e4SLinus Torvalds if (!changed && blinkenlights) { 2711da177e4SLinus Torvalds cursor++; 2721da177e4SLinus Torvalds cursor %= hub->descriptor->bNbrPorts; 2731da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 2741da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 2751da177e4SLinus Torvalds changed++; 2761da177e4SLinus Torvalds } 2771da177e4SLinus Torvalds if (changed) 2781da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 2821da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 2831da177e4SLinus Torvalds #define USB_STS_RETRIES 5 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds /* 2861da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 2871da177e4SLinus Torvalds */ 2881da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 2891da177e4SLinus Torvalds struct usb_hub_status *data) 2901da177e4SLinus Torvalds { 2911da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 2941da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 2951da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 2961da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 2971da177e4SLinus Torvalds } 2981da177e4SLinus Torvalds return status; 2991da177e4SLinus Torvalds } 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds /* 3021da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 3031da177e4SLinus Torvalds */ 3041da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 3051da177e4SLinus Torvalds struct usb_port_status *data) 3061da177e4SLinus Torvalds { 3071da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 3081da177e4SLinus Torvalds 3091da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 3101da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3111da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 3121da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 3131da177e4SLinus Torvalds } 3141da177e4SLinus Torvalds return status; 3151da177e4SLinus Torvalds } 3161da177e4SLinus Torvalds 3171da177e4SLinus Torvalds static void kick_khubd(struct usb_hub *hub) 3181da177e4SLinus Torvalds { 3191da177e4SLinus Torvalds unsigned long flags; 3201da177e4SLinus Torvalds 3211da177e4SLinus Torvalds spin_lock_irqsave(&hub_event_lock, flags); 3221da177e4SLinus Torvalds if (list_empty(&hub->event_list)) { 3231da177e4SLinus Torvalds list_add_tail(&hub->event_list, &hub_event_list); 3241da177e4SLinus Torvalds wake_up(&khubd_wait); 3251da177e4SLinus Torvalds } 3261da177e4SLinus Torvalds spin_unlock_irqrestore(&hub_event_lock, flags); 3271da177e4SLinus Torvalds } 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds void usb_kick_khubd(struct usb_device *hdev) 3301da177e4SLinus Torvalds { 3311da177e4SLinus Torvalds kick_khubd(hdev_to_hub(hdev)); 3321da177e4SLinus Torvalds } 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 3367d12e780SDavid Howells static void hub_irq(struct urb *urb) 3371da177e4SLinus Torvalds { 338ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 3391da177e4SLinus Torvalds int status; 3401da177e4SLinus Torvalds int i; 3411da177e4SLinus Torvalds unsigned long bits; 3421da177e4SLinus Torvalds 3431da177e4SLinus Torvalds switch (urb->status) { 3441da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 3451da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 3461da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 3471da177e4SLinus Torvalds return; 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds default: /* presumably an error */ 3501da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 3511da177e4SLinus Torvalds dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status); 3521da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 3531da177e4SLinus Torvalds goto resubmit; 3541da177e4SLinus Torvalds hub->error = urb->status; 3551da177e4SLinus Torvalds /* FALL THROUGH */ 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds /* let khubd handle things */ 3581da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 3591da177e4SLinus Torvalds bits = 0; 3601da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 3611da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 3621da177e4SLinus Torvalds << (i*8); 3631da177e4SLinus Torvalds hub->event_bits[0] = bits; 3641da177e4SLinus Torvalds break; 3651da177e4SLinus Torvalds } 3661da177e4SLinus Torvalds 3671da177e4SLinus Torvalds hub->nerrors = 0; 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds /* Something happened, let khubd figure it out */ 3701da177e4SLinus Torvalds kick_khubd(hub); 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds resubmit: 3731da177e4SLinus Torvalds if (hub->quiescing) 3741da177e4SLinus Torvalds return; 3751da177e4SLinus Torvalds 3761da177e4SLinus Torvalds if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 3771da177e4SLinus Torvalds && status != -ENODEV && status != -EPERM) 3781da177e4SLinus Torvalds dev_err (hub->intfdev, "resubmit --> %d\n", status); 3791da177e4SLinus Torvalds } 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 3821da177e4SLinus Torvalds static inline int 3831da177e4SLinus Torvalds hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) 3841da177e4SLinus Torvalds { 3851da177e4SLinus Torvalds return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3861da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 3871da177e4SLinus Torvalds tt, NULL, 0, 1000); 3881da177e4SLinus Torvalds } 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds /* 3911da177e4SLinus Torvalds * enumeration blocks khubd for a long time. we use keventd instead, since 3921da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 3931da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 3941da177e4SLinus Torvalds * both can talk to the same hub concurrently. 3951da177e4SLinus Torvalds */ 3961da177e4SLinus Torvalds static void hub_tt_kevent (void *arg) 3971da177e4SLinus Torvalds { 3981da177e4SLinus Torvalds struct usb_hub *hub = arg; 3991da177e4SLinus Torvalds unsigned long flags; 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 4021da177e4SLinus Torvalds while (!list_empty (&hub->tt.clear_list)) { 4031da177e4SLinus Torvalds struct list_head *temp; 4041da177e4SLinus Torvalds struct usb_tt_clear *clear; 4051da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4061da177e4SLinus Torvalds int status; 4071da177e4SLinus Torvalds 4081da177e4SLinus Torvalds temp = hub->tt.clear_list.next; 4091da177e4SLinus Torvalds clear = list_entry (temp, struct usb_tt_clear, clear_list); 4101da177e4SLinus Torvalds list_del (&clear->clear_list); 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 4131da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 4141da177e4SLinus Torvalds status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 4151da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds if (status) 4181da177e4SLinus Torvalds dev_err (&hdev->dev, 4191da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 4201da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 4211da177e4SLinus Torvalds kfree(clear); 4221da177e4SLinus Torvalds } 4231da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 4241da177e4SLinus Torvalds } 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds /** 4271da177e4SLinus Torvalds * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub 4281da177e4SLinus Torvalds * @udev: the device whose split transaction failed 4291da177e4SLinus Torvalds * @pipe: identifies the endpoint of the failed transaction 4301da177e4SLinus Torvalds * 4311da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 4321da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 4331da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 4341da177e4SLinus Torvalds * interrupt context. 4351da177e4SLinus Torvalds * 4361da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 4371da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 4381da177e4SLinus Torvalds */ 4391da177e4SLinus Torvalds void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe) 4401da177e4SLinus Torvalds { 4411da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 4421da177e4SLinus Torvalds unsigned long flags; 4431da177e4SLinus Torvalds struct usb_tt_clear *clear; 4441da177e4SLinus Torvalds 4451da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 4461da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 4471da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 4481da177e4SLinus Torvalds */ 4491da177e4SLinus Torvalds if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == NULL) { 4501da177e4SLinus Torvalds dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 4511da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 4521da177e4SLinus Torvalds return; 4531da177e4SLinus Torvalds } 4541da177e4SLinus Torvalds 4551da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 4561da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 4571da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 4581da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 4591da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol (pipe) 4601da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 4611da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 4621da177e4SLinus Torvalds if (usb_pipein (pipe)) 4631da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 4641da177e4SLinus Torvalds 4651da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 4661da177e4SLinus Torvalds spin_lock_irqsave (&tt->lock, flags); 4671da177e4SLinus Torvalds list_add_tail (&clear->clear_list, &tt->clear_list); 4681da177e4SLinus Torvalds schedule_work (&tt->kevent); 4691da177e4SLinus Torvalds spin_unlock_irqrestore (&tt->lock, flags); 4701da177e4SLinus Torvalds } 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds static void hub_power_on(struct usb_hub *hub) 4731da177e4SLinus Torvalds { 4741da177e4SLinus Torvalds int port1; 475b789696aSDavid Brownell unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 4764489a571SAlan Stern u16 wHubCharacteristics = 4774489a571SAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 4781da177e4SLinus Torvalds 4794489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 4804489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 4814489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 4824489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 4834489a571SAlan Stern * unless we send these messages to the hub. 4844489a571SAlan Stern */ 4854489a571SAlan Stern if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) 4861da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 4874489a571SAlan Stern else 4884489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 4894489a571SAlan Stern "non-switchable hub\n"); 4901da177e4SLinus Torvalds for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) 4914489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 4921da177e4SLinus Torvalds 493b789696aSDavid Brownell /* Wait at least 100 msec for power to become stable */ 494b789696aSDavid Brownell msleep(max(pgood_delay, (unsigned) 100)); 4951da177e4SLinus Torvalds } 4961da177e4SLinus Torvalds 49702c399eeSAlan Stern static void hub_quiesce(struct usb_hub *hub) 4981da177e4SLinus Torvalds { 499979d5199SDavid Brownell /* (nonblocking) khubd and related activity won't re-trigger */ 5001da177e4SLinus Torvalds hub->quiescing = 1; 501c9f89fa4SDavid Brownell hub->activating = 0; 502979d5199SDavid Brownell hub->resume_root_hub = 0; 503979d5199SDavid Brownell 504979d5199SDavid Brownell /* (blocking) stop khubd and related activity */ 5051da177e4SLinus Torvalds usb_kill_urb(hub->urb); 5061da177e4SLinus Torvalds if (hub->has_indicators) 5071da177e4SLinus Torvalds cancel_delayed_work(&hub->leds); 5081da177e4SLinus Torvalds if (hub->has_indicators || hub->tt.hub) 5091da177e4SLinus Torvalds flush_scheduled_work(); 5101da177e4SLinus Torvalds } 5111da177e4SLinus Torvalds 5121da177e4SLinus Torvalds static void hub_activate(struct usb_hub *hub) 5131da177e4SLinus Torvalds { 5141da177e4SLinus Torvalds int status; 5151da177e4SLinus Torvalds 5161da177e4SLinus Torvalds hub->quiescing = 0; 5171da177e4SLinus Torvalds hub->activating = 1; 518979d5199SDavid Brownell hub->resume_root_hub = 0; 5191da177e4SLinus Torvalds status = usb_submit_urb(hub->urb, GFP_NOIO); 5201da177e4SLinus Torvalds if (status < 0) 5211da177e4SLinus Torvalds dev_err(hub->intfdev, "activate --> %d\n", status); 5221da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 5231da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 5241da177e4SLinus Torvalds 5251da177e4SLinus Torvalds /* scan all ports ASAP */ 5261da177e4SLinus Torvalds kick_khubd(hub); 5271da177e4SLinus Torvalds } 5281da177e4SLinus Torvalds 5291da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 5301da177e4SLinus Torvalds u16 *status, u16 *change) 5311da177e4SLinus Torvalds { 5321da177e4SLinus Torvalds int ret; 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 5351da177e4SLinus Torvalds if (ret < 0) 5361da177e4SLinus Torvalds dev_err (hub->intfdev, 5371da177e4SLinus Torvalds "%s failed (err = %d)\n", __FUNCTION__, ret); 5381da177e4SLinus Torvalds else { 5391da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 5401da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 5411da177e4SLinus Torvalds ret = 0; 5421da177e4SLinus Torvalds } 5431da177e4SLinus Torvalds return ret; 5441da177e4SLinus Torvalds } 5451da177e4SLinus Torvalds 5468b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 5478b28c752SAlan Stern { 5488b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 5498b28c752SAlan Stern int ret; 5508b28c752SAlan Stern 5518b28c752SAlan Stern if (hdev->children[port1-1] && set_state) { 5528b28c752SAlan Stern usb_set_device_state(hdev->children[port1-1], 5538b28c752SAlan Stern USB_STATE_NOTATTACHED); 5548b28c752SAlan Stern } 5558b28c752SAlan Stern ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); 5568b28c752SAlan Stern if (ret) 5578b28c752SAlan Stern dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 5588b28c752SAlan Stern port1, ret); 5598b28c752SAlan Stern 5608b28c752SAlan Stern return ret; 5618b28c752SAlan Stern } 5628b28c752SAlan Stern 5637d069b7dSAlan Stern 5647d069b7dSAlan Stern /* caller has locked the hub device */ 5657de18d8bSAlan Stern static void hub_pre_reset(struct usb_interface *intf) 5667d069b7dSAlan Stern { 5677de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 5687d069b7dSAlan Stern struct usb_device *hdev = hub->hdev; 5697d069b7dSAlan Stern int port1; 5707d069b7dSAlan Stern 5717d069b7dSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 5727d069b7dSAlan Stern if (hdev->children[port1 - 1]) { 5737d069b7dSAlan Stern usb_disconnect(&hdev->children[port1 - 1]); 5747de18d8bSAlan Stern if (hub->error == 0) 5757d069b7dSAlan Stern hub_port_disable(hub, port1, 0); 5767d069b7dSAlan Stern } 5777d069b7dSAlan Stern } 5787d069b7dSAlan Stern hub_quiesce(hub); 5797d069b7dSAlan Stern } 5807d069b7dSAlan Stern 5817d069b7dSAlan Stern /* caller has locked the hub device */ 5827de18d8bSAlan Stern static void hub_post_reset(struct usb_interface *intf) 5837d069b7dSAlan Stern { 5847de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 5857de18d8bSAlan Stern 5867d069b7dSAlan Stern hub_activate(hub); 5877d069b7dSAlan Stern hub_power_on(hub); 5887d069b7dSAlan Stern } 5897d069b7dSAlan Stern 5907d069b7dSAlan Stern 5911da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 5921da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 5931da177e4SLinus Torvalds { 5941da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 5951da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 5961da177e4SLinus Torvalds u16 hubstatus, hubchange; 59774ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 5981da177e4SLinus Torvalds unsigned int pipe; 5991da177e4SLinus Torvalds int maxp, ret; 6001da177e4SLinus Torvalds char *message; 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL, 6031da177e4SLinus Torvalds &hub->buffer_dma); 6041da177e4SLinus Torvalds if (!hub->buffer) { 6051da177e4SLinus Torvalds message = "can't allocate hub irq buffer"; 6061da177e4SLinus Torvalds ret = -ENOMEM; 6071da177e4SLinus Torvalds goto fail; 6081da177e4SLinus Torvalds } 6091da177e4SLinus Torvalds 6101da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 6111da177e4SLinus Torvalds if (!hub->status) { 6121da177e4SLinus Torvalds message = "can't kmalloc hub status buffer"; 6131da177e4SLinus Torvalds ret = -ENOMEM; 6141da177e4SLinus Torvalds goto fail; 6151da177e4SLinus Torvalds } 6161da177e4SLinus Torvalds 6171da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 6181da177e4SLinus Torvalds if (!hub->descriptor) { 6191da177e4SLinus Torvalds message = "can't kmalloc hub descriptor"; 6201da177e4SLinus Torvalds ret = -ENOMEM; 6211da177e4SLinus Torvalds goto fail; 6221da177e4SLinus Torvalds } 6231da177e4SLinus Torvalds 6241da177e4SLinus Torvalds /* Request the entire hub descriptor. 6251da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 6261da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 6271da177e4SLinus Torvalds */ 6281da177e4SLinus Torvalds ret = get_hub_descriptor(hdev, hub->descriptor, 6291da177e4SLinus Torvalds sizeof(*hub->descriptor)); 6301da177e4SLinus Torvalds if (ret < 0) { 6311da177e4SLinus Torvalds message = "can't read hub descriptor"; 6321da177e4SLinus Torvalds goto fail; 6331da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 6341da177e4SLinus Torvalds message = "hub has too many ports!"; 6351da177e4SLinus Torvalds ret = -ENODEV; 6361da177e4SLinus Torvalds goto fail; 6371da177e4SLinus Torvalds } 6381da177e4SLinus Torvalds 6391da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 6401da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 6411da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 6421da177e4SLinus Torvalds 64374ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 6441da177e4SLinus Torvalds 64574ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_COMPOUND) { 6461da177e4SLinus Torvalds int i; 6471da177e4SLinus Torvalds char portstr [USB_MAXCHILDREN + 1]; 6481da177e4SLinus Torvalds 6491da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 6501da177e4SLinus Torvalds portstr[i] = hub->descriptor->DeviceRemovable 6511da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 6521da177e4SLinus Torvalds ? 'F' : 'R'; 6531da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 6541da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 6551da177e4SLinus Torvalds } else 6561da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 6571da177e4SLinus Torvalds 65874ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 6591da177e4SLinus Torvalds case 0x00: 6601da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 6611da177e4SLinus Torvalds break; 6621da177e4SLinus Torvalds case 0x01: 6631da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 6641da177e4SLinus Torvalds break; 6651da177e4SLinus Torvalds case 0x02: 6661da177e4SLinus Torvalds case 0x03: 6671da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 6681da177e4SLinus Torvalds break; 6691da177e4SLinus Torvalds } 6701da177e4SLinus Torvalds 67174ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 6721da177e4SLinus Torvalds case 0x00: 6731da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 6741da177e4SLinus Torvalds break; 6751da177e4SLinus Torvalds case 0x08: 6761da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 6771da177e4SLinus Torvalds break; 6781da177e4SLinus Torvalds case 0x10: 6791da177e4SLinus Torvalds case 0x18: 6801da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 6811da177e4SLinus Torvalds break; 6821da177e4SLinus Torvalds } 6831da177e4SLinus Torvalds 6841da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 6851da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 6861da177e4SLinus Torvalds INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub); 6871da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 6881da177e4SLinus Torvalds case 0: 6891da177e4SLinus Torvalds break; 6901da177e4SLinus Torvalds case 1: 6911da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 6921da177e4SLinus Torvalds hub->tt.hub = hdev; 6931da177e4SLinus Torvalds break; 6941da177e4SLinus Torvalds case 2: 6951da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 6961da177e4SLinus Torvalds if (ret == 0) { 6971da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 6981da177e4SLinus Torvalds hub->tt.multi = 1; 6991da177e4SLinus Torvalds } else 7001da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 7011da177e4SLinus Torvalds ret); 7021da177e4SLinus Torvalds hub->tt.hub = hdev; 7031da177e4SLinus Torvalds break; 7041da177e4SLinus Torvalds default: 7051da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 7061da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 7071da177e4SLinus Torvalds break; 7081da177e4SLinus Torvalds } 7091da177e4SLinus Torvalds 710e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 71174ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 712e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 713e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 714e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 715e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 716e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 717e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 718e09711aeSdavid-b@pacbell.net } 7191da177e4SLinus Torvalds break; 720e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 721e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 722e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 723e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 724e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 7251da177e4SLinus Torvalds break; 726e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 727e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 728e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 729e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 730e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 7311da177e4SLinus Torvalds break; 732e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 733e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 734e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 735e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 736e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 7371da177e4SLinus Torvalds break; 7381da177e4SLinus Torvalds } 7391da177e4SLinus Torvalds 7401da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 74174ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 7421da177e4SLinus Torvalds hub->has_indicators = 1; 7431da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 7441da177e4SLinus Torvalds } 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 7471da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 7501da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 7511da177e4SLinus Torvalds */ 7521da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 75355c52718SAlan Stern if (ret < 2) { 7541da177e4SLinus Torvalds message = "can't get hub status"; 7551da177e4SLinus Torvalds goto fail; 7561da177e4SLinus Torvalds } 7577d35b929SAlan Stern le16_to_cpus(&hubstatus); 7587d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 75955c52718SAlan Stern if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) 76055c52718SAlan Stern hub->mA_per_port = 500; 76155c52718SAlan Stern else { 76255c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 76355c52718SAlan Stern hub->limited_power = 1; 76455c52718SAlan Stern } 7657d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 7661da177e4SLinus Torvalds dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 7671da177e4SLinus Torvalds hub->descriptor->bHubContrCurrent); 76855c52718SAlan Stern hub->limited_power = 1; 76955c52718SAlan Stern if (hdev->maxchild > 0) { 77055c52718SAlan Stern int remaining = hdev->bus_mA - 77155c52718SAlan Stern hub->descriptor->bHubContrCurrent; 7721da177e4SLinus Torvalds 77355c52718SAlan Stern if (remaining < hdev->maxchild * 100) 77455c52718SAlan Stern dev_warn(hub_dev, 77555c52718SAlan Stern "insufficient power available " 77655c52718SAlan Stern "to use all downstream ports\n"); 77755c52718SAlan Stern hub->mA_per_port = 100; /* 7.2.1.1 */ 77855c52718SAlan Stern } 77955c52718SAlan Stern } else { /* Self-powered external hub */ 78055c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 78155c52718SAlan Stern * provide less current per port? */ 78255c52718SAlan Stern hub->mA_per_port = 500; 78355c52718SAlan Stern } 78455c52718SAlan Stern if (hub->mA_per_port < 500) 78555c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 78655c52718SAlan Stern hub->mA_per_port); 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 7891da177e4SLinus Torvalds if (ret < 0) { 7901da177e4SLinus Torvalds message = "can't get hub status"; 7911da177e4SLinus Torvalds goto fail; 7921da177e4SLinus Torvalds } 7931da177e4SLinus Torvalds 7941da177e4SLinus Torvalds /* local power status reports aren't always correct */ 7951da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 7961da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 7971da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 7981da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 7991da177e4SLinus Torvalds 80074ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 8011da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 8021da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 8031da177e4SLinus Torvalds 80488fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 80588fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 80688fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 80788fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 80888fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 80988fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 8101da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 8111da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 8121da177e4SLinus Torvalds 8131da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 8141da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 8151da177e4SLinus Torvalds 8161da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 8171da177e4SLinus Torvalds if (!hub->urb) { 8181da177e4SLinus Torvalds message = "couldn't allocate interrupt urb"; 8191da177e4SLinus Torvalds ret = -ENOMEM; 8201da177e4SLinus Torvalds goto fail; 8211da177e4SLinus Torvalds } 8221da177e4SLinus Torvalds 8231da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 8241da177e4SLinus Torvalds hub, endpoint->bInterval); 8251da177e4SLinus Torvalds hub->urb->transfer_dma = hub->buffer_dma; 8261da177e4SLinus Torvalds hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 8271da177e4SLinus Torvalds 8281da177e4SLinus Torvalds /* maybe cycle the hub leds */ 8291da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 8301da177e4SLinus Torvalds hub->indicator [0] = INDICATOR_CYCLE; 8311da177e4SLinus Torvalds 8321da177e4SLinus Torvalds hub_power_on(hub); 8331da177e4SLinus Torvalds hub_activate(hub); 8341da177e4SLinus Torvalds return 0; 8351da177e4SLinus Torvalds 8361da177e4SLinus Torvalds fail: 8371da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 8381da177e4SLinus Torvalds message, ret); 8391da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 8401da177e4SLinus Torvalds return ret; 8411da177e4SLinus Torvalds } 8421da177e4SLinus Torvalds 8431da177e4SLinus Torvalds static unsigned highspeed_hubs; 8441da177e4SLinus Torvalds 8451da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 8461da177e4SLinus Torvalds { 8471da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 8481da177e4SLinus Torvalds struct usb_device *hdev; 8491da177e4SLinus Torvalds 8507de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 8517de18d8bSAlan Stern hub->error = 0; 8527de18d8bSAlan Stern hub_pre_reset(intf); 8537de18d8bSAlan Stern 8548b28c752SAlan Stern usb_set_intfdata (intf, NULL); 8551da177e4SLinus Torvalds hdev = hub->hdev; 8561da177e4SLinus Torvalds 8571da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 8581da177e4SLinus Torvalds highspeed_hubs--; 8591da177e4SLinus Torvalds 8601da177e4SLinus Torvalds usb_free_urb(hub->urb); 8611da177e4SLinus Torvalds hub->urb = NULL; 8621da177e4SLinus Torvalds 8631da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 8641da177e4SLinus Torvalds list_del_init(&hub->event_list); 8651da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 8661da177e4SLinus Torvalds 8671da177e4SLinus Torvalds kfree(hub->descriptor); 8681da177e4SLinus Torvalds hub->descriptor = NULL; 8691da177e4SLinus Torvalds 8701da177e4SLinus Torvalds kfree(hub->status); 8711da177e4SLinus Torvalds hub->status = NULL; 8721da177e4SLinus Torvalds 8731da177e4SLinus Torvalds if (hub->buffer) { 8741da177e4SLinus Torvalds usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer, 8751da177e4SLinus Torvalds hub->buffer_dma); 8761da177e4SLinus Torvalds hub->buffer = NULL; 8771da177e4SLinus Torvalds } 8781da177e4SLinus Torvalds 8791da177e4SLinus Torvalds kfree(hub); 8801da177e4SLinus Torvalds } 8811da177e4SLinus Torvalds 8821da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 8831da177e4SLinus Torvalds { 8841da177e4SLinus Torvalds struct usb_host_interface *desc; 8851da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 8861da177e4SLinus Torvalds struct usb_device *hdev; 8871da177e4SLinus Torvalds struct usb_hub *hub; 8881da177e4SLinus Torvalds 8891da177e4SLinus Torvalds desc = intf->cur_altsetting; 8901da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 8911da177e4SLinus Torvalds 89289ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 89389ccbdc9SDavid Brownell if (hdev->parent) { 89489ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 89589ccbdc9SDavid Brownell return -ENODEV; 89689ccbdc9SDavid Brownell } 89789ccbdc9SDavid Brownell #endif 89889ccbdc9SDavid Brownell 8991da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 9001da177e4SLinus Torvalds /* specs is not defined, but it works */ 9011da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 9021da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 9031da177e4SLinus Torvalds descriptor_error: 9041da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 9051da177e4SLinus Torvalds return -EIO; 9061da177e4SLinus Torvalds } 9071da177e4SLinus Torvalds 9081da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 9091da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 9101da177e4SLinus Torvalds goto descriptor_error; 9111da177e4SLinus Torvalds 9121da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 9131da177e4SLinus Torvalds 914fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 915fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 9161da177e4SLinus Torvalds goto descriptor_error; 9171da177e4SLinus Torvalds 9181da177e4SLinus Torvalds /* We found a hub */ 9191da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 9201da177e4SLinus Torvalds 9210a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 9221da177e4SLinus Torvalds if (!hub) { 9231da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 9241da177e4SLinus Torvalds return -ENOMEM; 9251da177e4SLinus Torvalds } 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 9281da177e4SLinus Torvalds hub->intfdev = &intf->dev; 9291da177e4SLinus Torvalds hub->hdev = hdev; 9301da177e4SLinus Torvalds INIT_WORK(&hub->leds, led_work, hub); 9311da177e4SLinus Torvalds 9321da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 9331da177e4SLinus Torvalds 9341da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 9351da177e4SLinus Torvalds highspeed_hubs++; 9361da177e4SLinus Torvalds 9371da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 9381da177e4SLinus Torvalds return 0; 9391da177e4SLinus Torvalds 9401da177e4SLinus Torvalds hub_disconnect (intf); 9411da177e4SLinus Torvalds return -ENODEV; 9421da177e4SLinus Torvalds } 9431da177e4SLinus Torvalds 9441da177e4SLinus Torvalds static int 9451da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 9461da177e4SLinus Torvalds { 9471da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 9481da177e4SLinus Torvalds 9491da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 9501da177e4SLinus Torvalds switch (code) { 9511da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 9521da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 9531da177e4SLinus Torvalds int i; 9541da177e4SLinus Torvalds 9551da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 9561da177e4SLinus Torvalds if (hdev->devnum <= 0) 9571da177e4SLinus Torvalds info->nports = 0; 9581da177e4SLinus Torvalds else { 9591da177e4SLinus Torvalds info->nports = hdev->maxchild; 9601da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 9611da177e4SLinus Torvalds if (hdev->children[i] == NULL) 9621da177e4SLinus Torvalds info->port[i] = 0; 9631da177e4SLinus Torvalds else 9641da177e4SLinus Torvalds info->port[i] = 9651da177e4SLinus Torvalds hdev->children[i]->devnum; 9661da177e4SLinus Torvalds } 9671da177e4SLinus Torvalds } 9681da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 9691da177e4SLinus Torvalds 9701da177e4SLinus Torvalds return info->nports + 1; 9711da177e4SLinus Torvalds } 9721da177e4SLinus Torvalds 9731da177e4SLinus Torvalds default: 9741da177e4SLinus Torvalds return -ENOSYS; 9751da177e4SLinus Torvalds } 9761da177e4SLinus Torvalds } 9771da177e4SLinus Torvalds 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds /* grab device/port lock, returning index of that port (zero based). 9801da177e4SLinus Torvalds * protects the upstream link used by this device from concurrent 9811da177e4SLinus Torvalds * tree operations like suspend, resume, reset, and disconnect, which 9821da177e4SLinus Torvalds * apply to everything downstream of a given port. 9831da177e4SLinus Torvalds */ 9841da177e4SLinus Torvalds static int locktree(struct usb_device *udev) 9851da177e4SLinus Torvalds { 9861da177e4SLinus Torvalds int t; 9871da177e4SLinus Torvalds struct usb_device *hdev; 9881da177e4SLinus Torvalds 9891da177e4SLinus Torvalds if (!udev) 9901da177e4SLinus Torvalds return -ENODEV; 9911da177e4SLinus Torvalds 9921da177e4SLinus Torvalds /* root hub is always the first lock in the series */ 9931da177e4SLinus Torvalds hdev = udev->parent; 9941da177e4SLinus Torvalds if (!hdev) { 9951da177e4SLinus Torvalds usb_lock_device(udev); 9961da177e4SLinus Torvalds return 0; 9971da177e4SLinus Torvalds } 9981da177e4SLinus Torvalds 9991da177e4SLinus Torvalds /* on the path from root to us, lock everything from 10001da177e4SLinus Torvalds * top down, dropping parent locks when not needed 10011da177e4SLinus Torvalds */ 10021da177e4SLinus Torvalds t = locktree(hdev); 10031da177e4SLinus Torvalds if (t < 0) 10041da177e4SLinus Torvalds return t; 100512c3da34SAlan Stern 10061da177e4SLinus Torvalds /* everything is fail-fast once disconnect 10071da177e4SLinus Torvalds * processing starts 10081da177e4SLinus Torvalds */ 100912c3da34SAlan Stern if (udev->state == USB_STATE_NOTATTACHED) { 101012c3da34SAlan Stern usb_unlock_device(hdev); 101112c3da34SAlan Stern return -ENODEV; 101212c3da34SAlan Stern } 10131da177e4SLinus Torvalds 10141da177e4SLinus Torvalds /* when everyone grabs locks top->bottom, 10151da177e4SLinus Torvalds * non-overlapping work may be concurrent 10161da177e4SLinus Torvalds */ 10179ad3d6ccSAlan Stern usb_lock_device(udev); 10189ad3d6ccSAlan Stern usb_unlock_device(hdev); 101912c3da34SAlan Stern return udev->portnum; 10201da177e4SLinus Torvalds } 10211da177e4SLinus Torvalds 10221da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 10231da177e4SLinus Torvalds { 10241da177e4SLinus Torvalds int i; 10251da177e4SLinus Torvalds 10261da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 10271da177e4SLinus Torvalds if (udev->children[i]) 10281da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev->children[i]); 10291da177e4SLinus Torvalds } 10301da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 10311da177e4SLinus Torvalds } 10321da177e4SLinus Torvalds 10331da177e4SLinus Torvalds /** 10341da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 10351da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 10361da177e4SLinus Torvalds * @new_state: new state value to be stored 10371da177e4SLinus Torvalds * 10381da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 10391da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 10401da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 10411da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 10421da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 10431da177e4SLinus Torvalds * all changes to any device's state must be protected by the 10441da177e4SLinus Torvalds * device_state_lock spinlock. 10451da177e4SLinus Torvalds * 10461da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 10471da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 10481da177e4SLinus Torvalds * 10491da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 10501da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 10511da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 10521da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 10531da177e4SLinus Torvalds */ 10541da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 10551da177e4SLinus Torvalds enum usb_device_state new_state) 10561da177e4SLinus Torvalds { 10571da177e4SLinus Torvalds unsigned long flags; 10581da177e4SLinus Torvalds 10591da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 10601da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 10611da177e4SLinus Torvalds ; /* do nothing */ 1062b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1063fb669cc0SDavid Brownell 1064fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1065fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1066fb669cc0SDavid Brownell */ 1067fb669cc0SDavid Brownell if (udev->parent) { 1068645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1069645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1070645daaabSAlan Stern ; /* No change to wakeup settings */ 1071645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 1072b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 1073b94dc6b5SDavid Brownell (udev->actconfig->desc.bmAttributes 1074b94dc6b5SDavid Brownell & USB_CONFIG_ATT_WAKEUP)); 1075645daaabSAlan Stern else 1076b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 0); 1077fb669cc0SDavid Brownell } 1078645daaabSAlan Stern udev->state = new_state; 1079b94dc6b5SDavid Brownell } else 10801da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 10811da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 10821da177e4SLinus Torvalds } 10831da177e4SLinus Torvalds 10841da177e4SLinus Torvalds 10851c50c317SAlan Stern #ifdef CONFIG_PM 10861c50c317SAlan Stern 10871c50c317SAlan Stern /** 10881c50c317SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 10891c50c317SAlan Stern * @rhdev: struct usb_device for the root hub 10901c50c317SAlan Stern * 10911c50c317SAlan Stern * The USB host controller driver calls this function when its root hub 10921c50c317SAlan Stern * is resumed and Vbus power has been interrupted or the controller 10931c50c317SAlan Stern * has been reset. The routine marks all the children of the root hub 10941c50c317SAlan Stern * as NOTATTACHED and marks logical connect-change events on their ports. 10951c50c317SAlan Stern */ 10961c50c317SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 10971c50c317SAlan Stern { 10981c50c317SAlan Stern struct usb_hub *hub; 10991c50c317SAlan Stern int port1; 11001c50c317SAlan Stern unsigned long flags; 11011c50c317SAlan Stern 11021c50c317SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 1103353a4098SAlan Stern 1104353a4098SAlan Stern /* Make sure no potential wakeup events get lost, 1105353a4098SAlan Stern * by forcing the root hub to be resumed. 1106353a4098SAlan Stern */ 1107353a4098SAlan Stern rhdev->dev.power.prev_state.event = PM_EVENT_ON; 1108353a4098SAlan Stern 11091c50c317SAlan Stern spin_lock_irqsave(&device_state_lock, flags); 11101c50c317SAlan Stern hub = hdev_to_hub(rhdev); 11111c50c317SAlan Stern for (port1 = 1; port1 <= rhdev->maxchild; ++port1) { 11121c50c317SAlan Stern if (rhdev->children[port1 - 1]) { 11131c50c317SAlan Stern recursively_mark_NOTATTACHED( 11141c50c317SAlan Stern rhdev->children[port1 - 1]); 11151c50c317SAlan Stern set_bit(port1, hub->change_bits); 11161c50c317SAlan Stern } 11171c50c317SAlan Stern } 11181c50c317SAlan Stern spin_unlock_irqrestore(&device_state_lock, flags); 11191c50c317SAlan Stern } 11201c50c317SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 11211c50c317SAlan Stern 1122d388dab7SAlan Stern #endif /* CONFIG_PM */ 11231c50c317SAlan Stern 11241da177e4SLinus Torvalds static void choose_address(struct usb_device *udev) 11251da177e4SLinus Torvalds { 11261da177e4SLinus Torvalds int devnum; 11271da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 11281da177e4SLinus Torvalds 11291da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 11301da177e4SLinus Torvalds 11311da177e4SLinus Torvalds /* Try to allocate the next devnum beginning at bus->devnum_next. */ 11321da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 11331da177e4SLinus Torvalds bus->devnum_next); 11341da177e4SLinus Torvalds if (devnum >= 128) 11351da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1); 11361da177e4SLinus Torvalds 11371da177e4SLinus Torvalds bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); 11381da177e4SLinus Torvalds 11391da177e4SLinus Torvalds if (devnum < 128) { 11401da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 11411da177e4SLinus Torvalds udev->devnum = devnum; 11421da177e4SLinus Torvalds } 11431da177e4SLinus Torvalds } 11441da177e4SLinus Torvalds 11451da177e4SLinus Torvalds static void release_address(struct usb_device *udev) 11461da177e4SLinus Torvalds { 11471da177e4SLinus Torvalds if (udev->devnum > 0) { 11481da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 11491da177e4SLinus Torvalds udev->devnum = -1; 11501da177e4SLinus Torvalds } 11511da177e4SLinus Torvalds } 11521da177e4SLinus Torvalds 11531da177e4SLinus Torvalds /** 11541da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 11551da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 11561da177e4SLinus Torvalds * Context: !in_interrupt () 11571da177e4SLinus Torvalds * 11581da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 11591da177e4SLinus Torvalds * 11601da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 11611da177e4SLinus Torvalds * If *pdev is a root hub then this routine will acquire the 11621da177e4SLinus Torvalds * usb_bus_list_lock on behalf of the caller. 11631da177e4SLinus Torvalds * 11641da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 11651da177e4SLinus Torvalds * controllers) should ever call this. 11661da177e4SLinus Torvalds * 11671da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 11681da177e4SLinus Torvalds */ 11691da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 11701da177e4SLinus Torvalds { 11711da177e4SLinus Torvalds struct usb_device *udev = *pdev; 11721da177e4SLinus Torvalds int i; 11731da177e4SLinus Torvalds 11741da177e4SLinus Torvalds if (!udev) { 11751da177e4SLinus Torvalds pr_debug ("%s nodev\n", __FUNCTION__); 11761da177e4SLinus Torvalds return; 11771da177e4SLinus Torvalds } 11781da177e4SLinus Torvalds 11791da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 11801da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 11811da177e4SLinus Torvalds * this quiesces everyting except pending urbs. 11821da177e4SLinus Torvalds */ 11831da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 11841da177e4SLinus Torvalds dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); 11851da177e4SLinus Torvalds 11869ad3d6ccSAlan Stern usb_lock_device(udev); 11879ad3d6ccSAlan Stern 11881da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 11891da177e4SLinus Torvalds for (i = 0; i < USB_MAXCHILDREN; i++) { 11901da177e4SLinus Torvalds if (udev->children[i]) 11911da177e4SLinus Torvalds usb_disconnect(&udev->children[i]); 11921da177e4SLinus Torvalds } 11931da177e4SLinus Torvalds 11941da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 11951da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 11961da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 11971da177e4SLinus Torvalds */ 1198782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 11991da177e4SLinus Torvalds usb_disable_device(udev, 0); 12001da177e4SLinus Torvalds 1201782da727SAlan Stern usb_unlock_device(udev); 12023099e75aSGreg Kroah-Hartman 1203782da727SAlan Stern /* Unregister the device. The device driver is responsible 1204782da727SAlan Stern * for removing the device files from usbfs and sysfs and for 1205782da727SAlan Stern * de-configuring the device. 1206782da727SAlan Stern */ 1207782da727SAlan Stern device_del(&udev->dev); 1208782da727SAlan Stern 1209782da727SAlan Stern /* Free the device number and delete the parent's children[] 12101da177e4SLinus Torvalds * (or root_hub) pointer. 12111da177e4SLinus Torvalds */ 12121da177e4SLinus Torvalds release_address(udev); 12131da177e4SLinus Torvalds 12141da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 12151da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 12161da177e4SLinus Torvalds *pdev = NULL; 12171da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 12181da177e4SLinus Torvalds 1219782da727SAlan Stern put_device(&udev->dev); 12201da177e4SLinus Torvalds } 12211da177e4SLinus Torvalds 12221da177e4SLinus Torvalds #ifdef DEBUG 12231da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 12241da177e4SLinus Torvalds { 12251da177e4SLinus Torvalds if (!string) 12261da177e4SLinus Torvalds return; 12271da177e4SLinus Torvalds dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); 12281da177e4SLinus Torvalds } 12291da177e4SLinus Torvalds 12301da177e4SLinus Torvalds #else 12311da177e4SLinus Torvalds static inline void show_string(struct usb_device *udev, char *id, char *string) 12321da177e4SLinus Torvalds {} 12331da177e4SLinus Torvalds #endif 12341da177e4SLinus Torvalds 12351da177e4SLinus Torvalds 12361da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 12371da177e4SLinus Torvalds #include "otg_whitelist.h" 123811bd44abSDavid Brownell static int __usb_port_suspend(struct usb_device *, int port1); 12391da177e4SLinus Torvalds #endif 12401da177e4SLinus Torvalds 12411da177e4SLinus Torvalds /** 12421da177e4SLinus Torvalds * usb_new_device - perform initial device setup (usbcore-internal) 12431da177e4SLinus Torvalds * @udev: newly addressed device (in ADDRESS state) 12441da177e4SLinus Torvalds * 12451da177e4SLinus Torvalds * This is called with devices which have been enumerated, but not yet 12461da177e4SLinus Torvalds * configured. The device descriptor is available, but not descriptors 12479ad3d6ccSAlan Stern * for any device configuration. The caller must have locked either 12489ad3d6ccSAlan Stern * the parent hub (if udev is a normal device) or else the 12491da177e4SLinus Torvalds * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 12501da177e4SLinus Torvalds * udev has already been installed, but udev is not yet visible through 12511da177e4SLinus Torvalds * sysfs or other filesystem code. 12521da177e4SLinus Torvalds * 12531da177e4SLinus Torvalds * Returns 0 for success (device is configured and listed, with its 12541da177e4SLinus Torvalds * interfaces, in sysfs); else a negative errno value. 12551da177e4SLinus Torvalds * 12561da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 12571da177e4SLinus Torvalds * 12589ad3d6ccSAlan Stern * Only the hub driver or root-hub registrar should ever call this. 12591da177e4SLinus Torvalds */ 12601da177e4SLinus Torvalds int usb_new_device(struct usb_device *udev) 12611da177e4SLinus Torvalds { 12621da177e4SLinus Torvalds int err; 12631da177e4SLinus Torvalds 12641da177e4SLinus Torvalds err = usb_get_configuration(udev); 12651da177e4SLinus Torvalds if (err < 0) { 12661da177e4SLinus Torvalds dev_err(&udev->dev, "can't read configurations, error %d\n", 12671da177e4SLinus Torvalds err); 12681da177e4SLinus Torvalds goto fail; 12691da177e4SLinus Torvalds } 12701da177e4SLinus Torvalds 12711da177e4SLinus Torvalds /* read the standard strings and cache them if present */ 12724f62efe6SAlan Stern udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 12734f62efe6SAlan Stern udev->manufacturer = usb_cache_string(udev, 12744f62efe6SAlan Stern udev->descriptor.iManufacturer); 12754f62efe6SAlan Stern udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 12761da177e4SLinus Torvalds 12771da177e4SLinus Torvalds /* Tell the world! */ 12781da177e4SLinus Torvalds dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, " 12791da177e4SLinus Torvalds "SerialNumber=%d\n", 12801da177e4SLinus Torvalds udev->descriptor.iManufacturer, 12811da177e4SLinus Torvalds udev->descriptor.iProduct, 12821da177e4SLinus Torvalds udev->descriptor.iSerialNumber); 12831da177e4SLinus Torvalds show_string(udev, "Product", udev->product); 12841da177e4SLinus Torvalds show_string(udev, "Manufacturer", udev->manufacturer); 12851da177e4SLinus Torvalds show_string(udev, "SerialNumber", udev->serial); 12861da177e4SLinus Torvalds 12871da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 12881da177e4SLinus Torvalds /* 12891da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 12901da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 12911da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 12921da177e4SLinus Torvalds */ 12931da177e4SLinus Torvalds if (!udev->bus->is_b_host 12941da177e4SLinus Torvalds && udev->config 12951da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 12961da177e4SLinus Torvalds struct usb_otg_descriptor *desc = 0; 12971da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 12981da177e4SLinus Torvalds 12991da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 13001da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 13011da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 13021da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 13031da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 130412c3da34SAlan Stern unsigned port1 = udev->portnum; 13051da177e4SLinus Torvalds 13061da177e4SLinus Torvalds dev_info(&udev->dev, 13071da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 13081da177e4SLinus Torvalds (port1 == bus->otg_port) 13091da177e4SLinus Torvalds ? "" : "non-"); 13101da177e4SLinus Torvalds 13111da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 13121da177e4SLinus Torvalds if (port1 == bus->otg_port) 13131da177e4SLinus Torvalds bus->b_hnp_enable = 1; 13141da177e4SLinus Torvalds err = usb_control_msg(udev, 13151da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 13161da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 13171da177e4SLinus Torvalds bus->b_hnp_enable 13181da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 13191da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 13201da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 13211da177e4SLinus Torvalds if (err < 0) { 13221da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 13231da177e4SLinus Torvalds * customize to match your product. 13241da177e4SLinus Torvalds */ 13251da177e4SLinus Torvalds dev_info(&udev->dev, 13261da177e4SLinus Torvalds "can't set HNP mode; %d\n", 13271da177e4SLinus Torvalds err); 13281da177e4SLinus Torvalds bus->b_hnp_enable = 0; 13291da177e4SLinus Torvalds } 13301da177e4SLinus Torvalds } 13311da177e4SLinus Torvalds } 13321da177e4SLinus Torvalds } 13331da177e4SLinus Torvalds 13341da177e4SLinus Torvalds if (!is_targeted(udev)) { 13351da177e4SLinus Torvalds 13361da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 13371da177e4SLinus Torvalds * (Includes HNP test device.) 13381da177e4SLinus Torvalds */ 13391da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 1340140d8f68SAlan Stern err = __usb_port_suspend(udev, udev->bus->otg_port); 13411da177e4SLinus Torvalds if (err < 0) 13421da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 13431da177e4SLinus Torvalds } 13441da177e4SLinus Torvalds err = -ENODEV; 13451da177e4SLinus Torvalds goto fail; 13461da177e4SLinus Torvalds } 13471da177e4SLinus Torvalds #endif 13481da177e4SLinus Torvalds 1349782da727SAlan Stern /* Register the device. The device driver is responsible 1350782da727SAlan Stern * for adding the device files to usbfs and sysfs and for 1351782da727SAlan Stern * configuring the device. 1352782da727SAlan Stern */ 13531da177e4SLinus Torvalds err = device_add (&udev->dev); 13541da177e4SLinus Torvalds if (err) { 13551da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 13561da177e4SLinus Torvalds goto fail; 13571da177e4SLinus Torvalds } 13589ad3d6ccSAlan Stern 13591da177e4SLinus Torvalds return 0; 13601da177e4SLinus Torvalds 13611da177e4SLinus Torvalds fail: 13621da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 13631da177e4SLinus Torvalds return err; 13641da177e4SLinus Torvalds } 13651da177e4SLinus Torvalds 13661da177e4SLinus Torvalds 13671da177e4SLinus Torvalds static int hub_port_status(struct usb_hub *hub, int port1, 13681da177e4SLinus Torvalds u16 *status, u16 *change) 13691da177e4SLinus Torvalds { 13701da177e4SLinus Torvalds int ret; 13711da177e4SLinus Torvalds 13721da177e4SLinus Torvalds ret = get_port_status(hub->hdev, port1, &hub->status->port); 13731da177e4SLinus Torvalds if (ret < 0) 13741da177e4SLinus Torvalds dev_err (hub->intfdev, 13751da177e4SLinus Torvalds "%s failed (err = %d)\n", __FUNCTION__, ret); 13761da177e4SLinus Torvalds else { 13771da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->port.wPortStatus); 13781da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->port.wPortChange); 13791da177e4SLinus Torvalds ret = 0; 13801da177e4SLinus Torvalds } 13811da177e4SLinus Torvalds return ret; 13821da177e4SLinus Torvalds } 13831da177e4SLinus Torvalds 13840165de09SInaky Perez-Gonzalez 13850165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 13860165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 13870165de09SInaky Perez-Gonzalez { 13880165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 13890165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 13900165de09SInaky Perez-Gonzalez return 0; 13910165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 13920165de09SInaky Perez-Gonzalez return hcd->wireless; 13930165de09SInaky Perez-Gonzalez } 13940165de09SInaky Perez-Gonzalez 13950165de09SInaky Perez-Gonzalez 13961da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 13971da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 13981da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 13991da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 14001da177e4SLinus Torvalds #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) 14011da177e4SLinus Torvalds 14021da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 14031da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 14041da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 14051da177e4SLinus Torvalds #define HUB_RESET_TIMEOUT 500 14061da177e4SLinus Torvalds 14071da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 14081da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 14091da177e4SLinus Torvalds { 14101da177e4SLinus Torvalds int delay_time, ret; 14111da177e4SLinus Torvalds u16 portstatus; 14121da177e4SLinus Torvalds u16 portchange; 14131da177e4SLinus Torvalds 14141da177e4SLinus Torvalds for (delay_time = 0; 14151da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 14161da177e4SLinus Torvalds delay_time += delay) { 14171da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 14181da177e4SLinus Torvalds msleep(delay); 14191da177e4SLinus Torvalds 14201da177e4SLinus Torvalds /* read and decode port status */ 14211da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 14221da177e4SLinus Torvalds if (ret < 0) 14231da177e4SLinus Torvalds return ret; 14241da177e4SLinus Torvalds 14251da177e4SLinus Torvalds /* Device went away? */ 14261da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 14271da177e4SLinus Torvalds return -ENOTCONN; 14281da177e4SLinus Torvalds 14291da177e4SLinus Torvalds /* bomb out completely if something weird happened */ 14301da177e4SLinus Torvalds if ((portchange & USB_PORT_STAT_C_CONNECTION)) 14311da177e4SLinus Torvalds return -EINVAL; 14321da177e4SLinus Torvalds 14331da177e4SLinus Torvalds /* if we`ve finished resetting, then break out of the loop */ 14341da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_RESET) && 14351da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_ENABLE)) { 14360165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 14370165de09SInaky Perez-Gonzalez udev->speed = USB_SPEED_VARIABLE; 14380165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 14391da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 14401da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 14411da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 14421da177e4SLinus Torvalds else 14431da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 14441da177e4SLinus Torvalds return 0; 14451da177e4SLinus Torvalds } 14461da177e4SLinus Torvalds 14471da177e4SLinus Torvalds /* switch to the long delay after two short delay failures */ 14481da177e4SLinus Torvalds if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 14491da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 14501da177e4SLinus Torvalds 14511da177e4SLinus Torvalds dev_dbg (hub->intfdev, 14521da177e4SLinus Torvalds "port %d not reset yet, waiting %dms\n", 14531da177e4SLinus Torvalds port1, delay); 14541da177e4SLinus Torvalds } 14551da177e4SLinus Torvalds 14561da177e4SLinus Torvalds return -EBUSY; 14571da177e4SLinus Torvalds } 14581da177e4SLinus Torvalds 14591da177e4SLinus Torvalds static int hub_port_reset(struct usb_hub *hub, int port1, 14601da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 14611da177e4SLinus Torvalds { 14621da177e4SLinus Torvalds int i, status; 14631da177e4SLinus Torvalds 14641da177e4SLinus Torvalds /* Reset the port */ 14651da177e4SLinus Torvalds for (i = 0; i < PORT_RESET_TRIES; i++) { 14661da177e4SLinus Torvalds status = set_port_feature(hub->hdev, 14671da177e4SLinus Torvalds port1, USB_PORT_FEAT_RESET); 14681da177e4SLinus Torvalds if (status) 14691da177e4SLinus Torvalds dev_err(hub->intfdev, 14701da177e4SLinus Torvalds "cannot reset port %d (err = %d)\n", 14711da177e4SLinus Torvalds port1, status); 14721da177e4SLinus Torvalds else { 14731da177e4SLinus Torvalds status = hub_port_wait_reset(hub, port1, udev, delay); 1474dd16525bSDavid Brownell if (status && status != -ENOTCONN) 14751da177e4SLinus Torvalds dev_dbg(hub->intfdev, 14761da177e4SLinus Torvalds "port_wait_reset: err = %d\n", 14771da177e4SLinus Torvalds status); 14781da177e4SLinus Torvalds } 14791da177e4SLinus Torvalds 14801da177e4SLinus Torvalds /* return on disconnect or reset */ 14811da177e4SLinus Torvalds switch (status) { 14821da177e4SLinus Torvalds case 0: 1483b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 1484b789696aSDavid Brownell msleep(10 + 40); 14851da177e4SLinus Torvalds /* FALL THROUGH */ 14861da177e4SLinus Torvalds case -ENOTCONN: 14871da177e4SLinus Torvalds case -ENODEV: 14881da177e4SLinus Torvalds clear_port_feature(hub->hdev, 14891da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 14901da177e4SLinus Torvalds /* FIXME need disconnect() for NOTATTACHED device */ 14911da177e4SLinus Torvalds usb_set_device_state(udev, status 14921da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 14931da177e4SLinus Torvalds : USB_STATE_DEFAULT); 14941da177e4SLinus Torvalds return status; 14951da177e4SLinus Torvalds } 14961da177e4SLinus Torvalds 14971da177e4SLinus Torvalds dev_dbg (hub->intfdev, 14981da177e4SLinus Torvalds "port %d not enabled, trying reset again...\n", 14991da177e4SLinus Torvalds port1); 15001da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 15011da177e4SLinus Torvalds } 15021da177e4SLinus Torvalds 15031da177e4SLinus Torvalds dev_err (hub->intfdev, 15041da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 15051da177e4SLinus Torvalds port1); 15061da177e4SLinus Torvalds 15071da177e4SLinus Torvalds return status; 15081da177e4SLinus Torvalds } 15091da177e4SLinus Torvalds 15101da177e4SLinus Torvalds /* 15111da177e4SLinus Torvalds * Disable a port and mark a logical connnect-change event, so that some 15121da177e4SLinus Torvalds * time later khubd will disconnect() any existing usb_device on the port 15131da177e4SLinus Torvalds * and will re-enumerate if there actually is a device attached. 15141da177e4SLinus Torvalds */ 15151da177e4SLinus Torvalds static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 15161da177e4SLinus Torvalds { 15171da177e4SLinus Torvalds dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 15181da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 15191da177e4SLinus Torvalds 15201da177e4SLinus Torvalds /* FIXME let caller ask to power down the port: 15211da177e4SLinus Torvalds * - some devices won't enumerate without a VBUS power cycle 15221da177e4SLinus Torvalds * - SRP saves power that way 1523390a8c34SDavid Brownell * - ... new call, TBD ... 15241da177e4SLinus Torvalds * That's easy if this hub can switch power per-port, and 15251da177e4SLinus Torvalds * khubd reactivates the port later (timer, SRP, etc). 15261da177e4SLinus Torvalds * Powerdown must be optional, because of reset/DFU. 15271da177e4SLinus Torvalds */ 15281da177e4SLinus Torvalds 15291da177e4SLinus Torvalds set_bit(port1, hub->change_bits); 15301da177e4SLinus Torvalds kick_khubd(hub); 15311da177e4SLinus Torvalds } 15321da177e4SLinus Torvalds 1533d388dab7SAlan Stern #ifdef CONFIG_PM 15341da177e4SLinus Torvalds 15351da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 15361da177e4SLinus Torvalds 15371da177e4SLinus Torvalds /* 15381da177e4SLinus Torvalds * Selective port suspend reduces power; most suspended devices draw 15391da177e4SLinus Torvalds * less than 500 uA. It's also used in OTG, along with remote wakeup. 15401da177e4SLinus Torvalds * All devices below the suspended port are also suspended. 15411da177e4SLinus Torvalds * 15421da177e4SLinus Torvalds * Devices leave suspend state when the host wakes them up. Some devices 15431da177e4SLinus Torvalds * also support "remote wakeup", where the device can activate the USB 15441da177e4SLinus Torvalds * tree above them to deliver data, such as a keypress or packet. In 15451da177e4SLinus Torvalds * some cases, this wakes the USB host. 15461da177e4SLinus Torvalds */ 15471da177e4SLinus Torvalds static int hub_port_suspend(struct usb_hub *hub, int port1, 15481da177e4SLinus Torvalds struct usb_device *udev) 15491da177e4SLinus Torvalds { 15501da177e4SLinus Torvalds int status; 15511da177e4SLinus Torvalds 15521da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "suspend port %d\n", port1); 15531da177e4SLinus Torvalds 15541da177e4SLinus Torvalds /* enable remote wakeup when appropriate; this lets the device 15551da177e4SLinus Torvalds * wake up the upstream hub (including maybe the root hub). 15561da177e4SLinus Torvalds * 15571da177e4SLinus Torvalds * NOTE: OTG devices may issue remote wakeup (or SRP) even when 15581da177e4SLinus Torvalds * we don't explicitly enable it here. 15591da177e4SLinus Torvalds */ 1560645daaabSAlan Stern if (udev->do_remote_wakeup) { 15611da177e4SLinus Torvalds status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 15621da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 15631da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 15641da177e4SLinus Torvalds NULL, 0, 15651da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 15661da177e4SLinus Torvalds if (status) 15671da177e4SLinus Torvalds dev_dbg(&udev->dev, 15681da177e4SLinus Torvalds "won't remote wakeup, status %d\n", 15691da177e4SLinus Torvalds status); 15701da177e4SLinus Torvalds } 15711da177e4SLinus Torvalds 15721da177e4SLinus Torvalds /* see 7.1.7.6 */ 15731da177e4SLinus Torvalds status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); 15741da177e4SLinus Torvalds if (status) { 15751da177e4SLinus Torvalds dev_dbg(hub->intfdev, 15761da177e4SLinus Torvalds "can't suspend port %d, status %d\n", 15771da177e4SLinus Torvalds port1, status); 15781da177e4SLinus Torvalds /* paranoia: "should not happen" */ 15791da177e4SLinus Torvalds (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 15801da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 15811da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 15821da177e4SLinus Torvalds NULL, 0, 15831da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 15841da177e4SLinus Torvalds } else { 15851da177e4SLinus Torvalds /* device has up to 10 msec to fully suspend */ 1586645daaabSAlan Stern dev_dbg(&udev->dev, "usb %ssuspend\n", 1587645daaabSAlan Stern udev->auto_pm ? "auto-" : ""); 15881da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_SUSPENDED); 15891da177e4SLinus Torvalds msleep(10); 15901da177e4SLinus Torvalds } 15911da177e4SLinus Torvalds return status; 15921da177e4SLinus Torvalds } 15931da177e4SLinus Torvalds 15941da177e4SLinus Torvalds /* 15951da177e4SLinus Torvalds * Devices on USB hub ports have only one "suspend" state, corresponding 1596ba9d35fbSPavel Machek * to ACPI D2, "may cause the device to lose some context". 15971da177e4SLinus Torvalds * State transitions include: 15981da177e4SLinus Torvalds * 15991da177e4SLinus Torvalds * - suspend, resume ... when the VBUS power link stays live 16001da177e4SLinus Torvalds * - suspend, disconnect ... VBUS lost 16011da177e4SLinus Torvalds * 16021da177e4SLinus Torvalds * Once VBUS drop breaks the circuit, the port it's using has to go through 16031da177e4SLinus Torvalds * normal re-enumeration procedures, starting with enabling VBUS power. 16041da177e4SLinus Torvalds * Other than re-initializing the hub (plug/unplug, except for root hubs), 16051da177e4SLinus Torvalds * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 16061da177e4SLinus Torvalds * timer, no SRP, no requests through sysfs. 1607390a8c34SDavid Brownell * 1608390a8c34SDavid Brownell * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when 1609390a8c34SDavid Brownell * the root hub for their bus goes into global suspend ... so we don't 1610390a8c34SDavid Brownell * (falsely) update the device power state to say it suspended. 16111da177e4SLinus Torvalds */ 1612140d8f68SAlan Stern static int __usb_port_suspend (struct usb_device *udev, int port1) 16131da177e4SLinus Torvalds { 1614f3f3253dSDavid Brownell int status = 0; 16151da177e4SLinus Torvalds 16161da177e4SLinus Torvalds /* caller owns the udev device lock */ 16171da177e4SLinus Torvalds if (port1 < 0) 16181da177e4SLinus Torvalds return port1; 16191da177e4SLinus Torvalds 1620140d8f68SAlan Stern /* we change the device's upstream USB link, 1621140d8f68SAlan Stern * but root hubs have no upstream USB link. 16221da177e4SLinus Torvalds */ 1623f3f3253dSDavid Brownell if (udev->parent) 16241da177e4SLinus Torvalds status = hub_port_suspend(hdev_to_hub(udev->parent), port1, 16251da177e4SLinus Torvalds udev); 16262bf4086dSAlan Stern else { 1627645daaabSAlan Stern dev_dbg(&udev->dev, "usb %ssuspend\n", 1628645daaabSAlan Stern udev->auto_pm ? "auto-" : ""); 16292bf4086dSAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 16302bf4086dSAlan Stern } 16311da177e4SLinus Torvalds return status; 16321da177e4SLinus Torvalds } 16331da177e4SLinus Torvalds 16345edbfb7cSDavid Brownell /* 1635140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 16361da177e4SLinus Torvalds * @udev: device that's no longer in active use 16375edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 16381da177e4SLinus Torvalds * 16391da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 16401da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 16411da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 1642140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 16431da177e4SLinus Torvalds * to disconnect devices while they are suspended. 16441da177e4SLinus Torvalds * 1645390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 1646390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 1647390a8c34SDavid Brownell * 16481da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 16491da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 16501da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 16511da177e4SLinus Torvalds * 16521da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 16531da177e4SLinus Torvalds */ 1654140d8f68SAlan Stern int usb_port_suspend(struct usb_device *udev) 16551da177e4SLinus Torvalds { 1656140d8f68SAlan Stern return __usb_port_suspend(udev, udev->portnum); 16571da177e4SLinus Torvalds } 1658f3f3253dSDavid Brownell 16591da177e4SLinus Torvalds /* 1660390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 1661390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 1662390a8c34SDavid Brownell * special" resume" signaling. These routines kick in shortly after 16631da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 16641da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 16651da177e4SLinus Torvalds * in the tree that's rooted at this device. 16661da177e4SLinus Torvalds */ 1667140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 16681da177e4SLinus Torvalds { 16691da177e4SLinus Torvalds int status; 16701da177e4SLinus Torvalds u16 devstatus; 16711da177e4SLinus Torvalds 16721da177e4SLinus Torvalds /* caller owns the udev device lock */ 1673f3f3253dSDavid Brownell dev_dbg(&udev->dev, "finish resume\n"); 16741da177e4SLinus Torvalds 16751da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 16761da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 16771da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 16781da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 16791da177e4SLinus Torvalds */ 16801da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 16811da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 16821da177e4SLinus Torvalds : USB_STATE_ADDRESS); 16831da177e4SLinus Torvalds 16841da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 16851da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 16861da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 16871da177e4SLinus Torvalds */ 16881da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 1689b40b7a90SAlan Stern if (status >= 0) 1690b40b7a90SAlan Stern status = (status == 2 ? 0 : -ENODEV); 1691b40b7a90SAlan Stern 1692b40b7a90SAlan Stern if (status) 16931da177e4SLinus Torvalds dev_dbg(&udev->dev, 16941da177e4SLinus Torvalds "gone after usb resume? status %d\n", 16951da177e4SLinus Torvalds status); 16961da177e4SLinus Torvalds else if (udev->actconfig) { 16971da177e4SLinus Torvalds le16_to_cpus(&devstatus); 169855c52718SAlan Stern if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) 1699f3f3253dSDavid Brownell && udev->parent) { 17001da177e4SLinus Torvalds status = usb_control_msg(udev, 17011da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 17021da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, 17031da177e4SLinus Torvalds USB_RECIP_DEVICE, 17041da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 17051da177e4SLinus Torvalds NULL, 0, 17061da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 1707a8e7c565SAlan Stern if (status) 17081da177e4SLinus Torvalds dev_dbg(&udev->dev, "disable remote " 17091da177e4SLinus Torvalds "wakeup, status %d\n", status); 17104bf0ba86SAlan Stern } 17111da177e4SLinus Torvalds status = 0; 17121da177e4SLinus Torvalds 17131da177e4SLinus Torvalds } else if (udev->devnum <= 0) { 17141da177e4SLinus Torvalds dev_dbg(&udev->dev, "bogus resume!\n"); 17151da177e4SLinus Torvalds status = -EINVAL; 17161da177e4SLinus Torvalds } 17171da177e4SLinus Torvalds return status; 17181da177e4SLinus Torvalds } 17191da177e4SLinus Torvalds 17201da177e4SLinus Torvalds static int 17211da177e4SLinus Torvalds hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev) 17221da177e4SLinus Torvalds { 17231da177e4SLinus Torvalds int status; 17241da177e4SLinus Torvalds 17251da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "resume port %d\n", port1); 17261da177e4SLinus Torvalds 1727d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 1728d5cbad4bSAlan Stern 17291da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 17301da177e4SLinus Torvalds status = clear_port_feature(hub->hdev, 17311da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 17321da177e4SLinus Torvalds if (status) { 17331da177e4SLinus Torvalds dev_dbg(hub->intfdev, 17341da177e4SLinus Torvalds "can't resume port %d, status %d\n", 17351da177e4SLinus Torvalds port1, status); 17361da177e4SLinus Torvalds } else { 17371da177e4SLinus Torvalds u16 devstatus; 17381da177e4SLinus Torvalds u16 portchange; 17391da177e4SLinus Torvalds 17401da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 17411da177e4SLinus Torvalds if (udev) 1742645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 1743645daaabSAlan Stern udev->auto_pm ? "auto-" : ""); 17441da177e4SLinus Torvalds msleep(25); 17451da177e4SLinus Torvalds 17461da177e4SLinus Torvalds #define LIVE_FLAGS ( USB_PORT_STAT_POWER \ 17471da177e4SLinus Torvalds | USB_PORT_STAT_ENABLE \ 17481da177e4SLinus Torvalds | USB_PORT_STAT_CONNECTION) 17491da177e4SLinus Torvalds 17501da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 17511da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 17521da177e4SLinus Torvalds * sequence. 17531da177e4SLinus Torvalds */ 17541da177e4SLinus Torvalds devstatus = portchange = 0; 17551da177e4SLinus Torvalds status = hub_port_status(hub, port1, 17561da177e4SLinus Torvalds &devstatus, &portchange); 17571da177e4SLinus Torvalds if (status < 0 17581da177e4SLinus Torvalds || (devstatus & LIVE_FLAGS) != LIVE_FLAGS 17591da177e4SLinus Torvalds || (devstatus & USB_PORT_STAT_SUSPEND) != 0 17601da177e4SLinus Torvalds ) { 17611da177e4SLinus Torvalds dev_dbg(hub->intfdev, 17621da177e4SLinus Torvalds "port %d status %04x.%04x after resume, %d\n", 17631da177e4SLinus Torvalds port1, portchange, devstatus, status); 176420307949SAlan Stern if (status >= 0) 176520307949SAlan Stern status = -ENODEV; 17661da177e4SLinus Torvalds } else { 176720307949SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 176820307949SAlan Stern clear_port_feature(hub->hdev, port1, 176920307949SAlan Stern USB_PORT_FEAT_C_SUSPEND); 17701da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 17711da177e4SLinus Torvalds msleep(10); 17721da177e4SLinus Torvalds if (udev) 1773140d8f68SAlan Stern status = finish_port_resume(udev); 17741da177e4SLinus Torvalds } 17751da177e4SLinus Torvalds } 17761da177e4SLinus Torvalds if (status < 0) 17771da177e4SLinus Torvalds hub_port_logical_disconnect(hub, port1); 17781da177e4SLinus Torvalds 1779d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 1780d5cbad4bSAlan Stern if (!hub->hdev->parent && !hub->busy_bits[0]) 1781d5cbad4bSAlan Stern usb_enable_root_hub_irq(hub->hdev->bus); 1782d5cbad4bSAlan Stern 17831da177e4SLinus Torvalds return status; 17841da177e4SLinus Torvalds } 17851da177e4SLinus Torvalds 17865edbfb7cSDavid Brownell /* 1787140d8f68SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 17881da177e4SLinus Torvalds * @udev: device to re-activate 17895edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 17901da177e4SLinus Torvalds * 17911da177e4SLinus Torvalds * This will re-activate the suspended device, increasing power usage 17921da177e4SLinus Torvalds * while letting drivers communicate again with its endpoints. 17931da177e4SLinus Torvalds * USB resume explicitly guarantees that the power session between 17941da177e4SLinus Torvalds * the host and the device is the same as it was when the device 17951da177e4SLinus Torvalds * suspended. 17961da177e4SLinus Torvalds * 17971da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 17981da177e4SLinus Torvalds */ 1799140d8f68SAlan Stern int usb_port_resume(struct usb_device *udev) 18001da177e4SLinus Torvalds { 1801d388dab7SAlan Stern int status; 18021da177e4SLinus Torvalds 1803140d8f68SAlan Stern /* we change the device's upstream USB link, 1804140d8f68SAlan Stern * but root hubs have no upstream USB link. 1805140d8f68SAlan Stern */ 1806f3f3253dSDavid Brownell if (udev->parent) { 18071da177e4SLinus Torvalds // NOTE this fails if parent is also suspended... 18081da177e4SLinus Torvalds status = hub_port_resume(hdev_to_hub(udev->parent), 180912c3da34SAlan Stern udev->portnum, udev); 1810645daaabSAlan Stern } else { 1811645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 1812645daaabSAlan Stern udev->auto_pm ? "auto-" : ""); 1813140d8f68SAlan Stern status = finish_port_resume(udev); 1814645daaabSAlan Stern } 1815f3f3253dSDavid Brownell if (status < 0) 1816a8e7c565SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 18171da177e4SLinus Torvalds return status; 18181da177e4SLinus Torvalds } 18191da177e4SLinus Torvalds 18201da177e4SLinus Torvalds static int remote_wakeup(struct usb_device *udev) 18211da177e4SLinus Torvalds { 18221da177e4SLinus Torvalds int status = 0; 18231da177e4SLinus Torvalds 1824645daaabSAlan Stern /* All this just to avoid sending a port-resume message 1825645daaabSAlan Stern * to the parent hub! */ 1826645daaabSAlan Stern 18279ad3d6ccSAlan Stern usb_lock_device(udev); 1828e0318ebfSAlan Stern usb_pm_lock(udev); 18291da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 1830645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 18311da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 18321da177e4SLinus Torvalds msleep(10); 1833140d8f68SAlan Stern status = finish_port_resume(udev); 1834645daaabSAlan Stern if (status == 0) 1835645daaabSAlan Stern udev->dev.power.power_state.event = PM_EVENT_ON; 18361da177e4SLinus Torvalds } 1837e0318ebfSAlan Stern usb_pm_unlock(udev); 1838a8e7c565SAlan Stern 1839a8e7c565SAlan Stern if (status == 0) 1840645daaabSAlan Stern usb_autoresume_device(udev, 0); 18419ad3d6ccSAlan Stern usb_unlock_device(udev); 18421da177e4SLinus Torvalds return status; 18431da177e4SLinus Torvalds } 18441da177e4SLinus Torvalds 1845d388dab7SAlan Stern #else /* CONFIG_USB_SUSPEND */ 1846d388dab7SAlan Stern 1847d388dab7SAlan Stern /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ 1848d388dab7SAlan Stern 1849d388dab7SAlan Stern int usb_port_suspend(struct usb_device *udev) 1850d388dab7SAlan Stern { 1851d388dab7SAlan Stern return 0; 1852d388dab7SAlan Stern } 1853d388dab7SAlan Stern 1854d388dab7SAlan Stern static inline int 1855d388dab7SAlan Stern finish_port_resume(struct usb_device *udev) 1856d388dab7SAlan Stern { 1857d388dab7SAlan Stern return 0; 1858d388dab7SAlan Stern } 1859d388dab7SAlan Stern 1860d388dab7SAlan Stern static inline int 1861d388dab7SAlan Stern hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev) 1862d388dab7SAlan Stern { 1863d388dab7SAlan Stern return 0; 1864d388dab7SAlan Stern } 1865d388dab7SAlan Stern 1866d388dab7SAlan Stern int usb_port_resume(struct usb_device *udev) 1867d388dab7SAlan Stern { 1868d388dab7SAlan Stern return 0; 1869d388dab7SAlan Stern } 1870d388dab7SAlan Stern 1871d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 1872d388dab7SAlan Stern { 1873d388dab7SAlan Stern return 0; 1874d388dab7SAlan Stern } 1875d388dab7SAlan Stern 1876d388dab7SAlan Stern #endif 1877d388dab7SAlan Stern 1878db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 18791da177e4SLinus Torvalds { 18801da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 18811da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 18821da177e4SLinus Torvalds unsigned port1; 18831da177e4SLinus Torvalds 1884c9f89fa4SDavid Brownell /* fail if children aren't already suspended */ 18851da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 18861da177e4SLinus Torvalds struct usb_device *udev; 18871da177e4SLinus Torvalds 18881da177e4SLinus Torvalds udev = hdev->children [port1-1]; 1889114b368cSAlan Stern if (udev && msg.event == PM_EVENT_SUSPEND && 1890f3f3253dSDavid Brownell #ifdef CONFIG_USB_SUSPEND 1891114b368cSAlan Stern udev->state != USB_STATE_SUSPENDED 1892114b368cSAlan Stern #else 1893114b368cSAlan Stern udev->dev.power.power_state.event 1894114b368cSAlan Stern == PM_EVENT_ON 1895f3f3253dSDavid Brownell #endif 1896114b368cSAlan Stern ) { 1897645daaabSAlan Stern if (!hdev->auto_pm) 1898645daaabSAlan Stern dev_dbg(&intf->dev, "port %d nyet suspended\n", 1899645daaabSAlan Stern port1); 1900c9f89fa4SDavid Brownell return -EBUSY; 1901c9f89fa4SDavid Brownell } 19021da177e4SLinus Torvalds } 19031da177e4SLinus Torvalds 1904f3f3253dSDavid Brownell /* "global suspend" of the downstream HC-to-USB interface */ 1905f3f3253dSDavid Brownell if (!hdev->parent) { 1906f3f3253dSDavid Brownell struct usb_bus *bus = hdev->bus; 19070c0382e3SAlan Stern if (bus) { 19080c0382e3SAlan Stern int status = hcd_bus_suspend (bus); 1909f3f3253dSDavid Brownell 1910f3f3253dSDavid Brownell if (status != 0) { 1911f3f3253dSDavid Brownell dev_dbg(&hdev->dev, "'global' suspend %d\n", 1912f3f3253dSDavid Brownell status); 1913f3f3253dSDavid Brownell return status; 1914f3f3253dSDavid Brownell } 1915f3f3253dSDavid Brownell } else 1916f3f3253dSDavid Brownell return -EOPNOTSUPP; 1917f3f3253dSDavid Brownell } 1918f3f3253dSDavid Brownell 1919c9f89fa4SDavid Brownell /* stop khubd and related activity */ 1920c9f89fa4SDavid Brownell hub_quiesce(hub); 19211da177e4SLinus Torvalds return 0; 19221da177e4SLinus Torvalds } 19231da177e4SLinus Torvalds 19241da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 19251da177e4SLinus Torvalds { 19261da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev(intf); 19271da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 19281da177e4SLinus Torvalds int status; 19291da177e4SLinus Torvalds 1930f3f3253dSDavid Brownell /* "global resume" of the downstream HC-to-USB interface */ 1931f3f3253dSDavid Brownell if (!hdev->parent) { 1932f3f3253dSDavid Brownell struct usb_bus *bus = hdev->bus; 19330c0382e3SAlan Stern if (bus) { 19340c0382e3SAlan Stern status = hcd_bus_resume (bus); 1935f3f3253dSDavid Brownell if (status) { 1936f3f3253dSDavid Brownell dev_dbg(&intf->dev, "'global' resume %d\n", 1937f3f3253dSDavid Brownell status); 1938f3f3253dSDavid Brownell return status; 1939f3f3253dSDavid Brownell } 1940f3f3253dSDavid Brownell } else 1941f3f3253dSDavid Brownell return -EOPNOTSUPP; 1942f3f3253dSDavid Brownell if (status == 0) { 1943f3f3253dSDavid Brownell /* TRSMRCY = 10 msec */ 1944f3f3253dSDavid Brownell msleep(10); 1945f3f3253dSDavid Brownell } 1946f3f3253dSDavid Brownell } 1947f3f3253dSDavid Brownell 1948a8e7c565SAlan Stern /* tell khubd to look for changes on this hub */ 1949f3f3253dSDavid Brownell hub_activate(hub); 19501da177e4SLinus Torvalds return 0; 19511da177e4SLinus Torvalds } 19521da177e4SLinus Torvalds 1953d388dab7SAlan Stern #else /* CONFIG_PM */ 1954d388dab7SAlan Stern 1955d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 1956d388dab7SAlan Stern { 1957d388dab7SAlan Stern return 0; 1958d388dab7SAlan Stern } 1959d388dab7SAlan Stern 1960511366daSAndrew Morton #define hub_suspend NULL 1961511366daSAndrew Morton #define hub_resume NULL 1962d388dab7SAlan Stern #endif 1963d388dab7SAlan Stern 19641da177e4SLinus Torvalds void usb_resume_root_hub(struct usb_device *hdev) 19651da177e4SLinus Torvalds { 19661da177e4SLinus Torvalds struct usb_hub *hub = hdev_to_hub(hdev); 19671da177e4SLinus Torvalds 19681da177e4SLinus Torvalds hub->resume_root_hub = 1; 19691da177e4SLinus Torvalds kick_khubd(hub); 19701da177e4SLinus Torvalds } 19711da177e4SLinus Torvalds 19721da177e4SLinus Torvalds 19731da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 19741da177e4SLinus Torvalds * 19751da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 19761da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 19771da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 19781da177e4SLinus Torvalds * 19791da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 19801da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 19811da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 19821da177e4SLinus Torvalds * 19831da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 19841da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 19851da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 19861da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 19871da177e4SLinus Torvalds */ 19881da177e4SLinus Torvalds 19891da177e4SLinus Torvalds #define HUB_DEBOUNCE_TIMEOUT 1500 19901da177e4SLinus Torvalds #define HUB_DEBOUNCE_STEP 25 19911da177e4SLinus Torvalds #define HUB_DEBOUNCE_STABLE 100 19921da177e4SLinus Torvalds 19931da177e4SLinus Torvalds static int hub_port_debounce(struct usb_hub *hub, int port1) 19941da177e4SLinus Torvalds { 19951da177e4SLinus Torvalds int ret; 19961da177e4SLinus Torvalds int total_time, stable_time = 0; 19971da177e4SLinus Torvalds u16 portchange, portstatus; 19981da177e4SLinus Torvalds unsigned connection = 0xffff; 19991da177e4SLinus Torvalds 20001da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 20011da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 20021da177e4SLinus Torvalds if (ret < 0) 20031da177e4SLinus Torvalds return ret; 20041da177e4SLinus Torvalds 20051da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 20061da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 20071da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 20081da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 20091da177e4SLinus Torvalds break; 20101da177e4SLinus Torvalds } else { 20111da177e4SLinus Torvalds stable_time = 0; 20121da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 20131da177e4SLinus Torvalds } 20141da177e4SLinus Torvalds 20151da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 20161da177e4SLinus Torvalds clear_port_feature(hub->hdev, port1, 20171da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 20181da177e4SLinus Torvalds } 20191da177e4SLinus Torvalds 20201da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 20211da177e4SLinus Torvalds break; 20221da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 20231da177e4SLinus Torvalds } 20241da177e4SLinus Torvalds 20251da177e4SLinus Torvalds dev_dbg (hub->intfdev, 20261da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 20271da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 20281da177e4SLinus Torvalds 20291da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 20301da177e4SLinus Torvalds return -ETIMEDOUT; 20311da177e4SLinus Torvalds return portstatus; 20321da177e4SLinus Torvalds } 20331da177e4SLinus Torvalds 20341da177e4SLinus Torvalds static void ep0_reinit(struct usb_device *udev) 20351da177e4SLinus Torvalds { 20361da177e4SLinus Torvalds usb_disable_endpoint(udev, 0 + USB_DIR_IN); 20371da177e4SLinus Torvalds usb_disable_endpoint(udev, 0 + USB_DIR_OUT); 20381da177e4SLinus Torvalds udev->ep_in[0] = udev->ep_out[0] = &udev->ep0; 20391da177e4SLinus Torvalds } 20401da177e4SLinus Torvalds 20411da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 20421da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 20431da177e4SLinus Torvalds 20441da177e4SLinus Torvalds static int hub_set_address(struct usb_device *udev) 20451da177e4SLinus Torvalds { 20461da177e4SLinus Torvalds int retval; 20471da177e4SLinus Torvalds 20481da177e4SLinus Torvalds if (udev->devnum == 0) 20491da177e4SLinus Torvalds return -EINVAL; 20501da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 20511da177e4SLinus Torvalds return 0; 20521da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 20531da177e4SLinus Torvalds return -EINVAL; 20541da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 20551da177e4SLinus Torvalds USB_REQ_SET_ADDRESS, 0, udev->devnum, 0, 20561da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 20571da177e4SLinus Torvalds if (retval == 0) { 20581da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 20591da177e4SLinus Torvalds ep0_reinit(udev); 20601da177e4SLinus Torvalds } 20611da177e4SLinus Torvalds return retval; 20621da177e4SLinus Torvalds } 20631da177e4SLinus Torvalds 20641da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 20651da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 20661da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 20671da177e4SLinus Torvalds * 20681da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 20691da177e4SLinus Torvalds * usb_reset_device), the caller must own the device lock. For a 20701da177e4SLinus Torvalds * newly detected device that is not accessible through any global 20711da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 20721da177e4SLinus Torvalds */ 20731da177e4SLinus Torvalds static int 20741da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 20751da177e4SLinus Torvalds int retry_counter) 20761da177e4SLinus Torvalds { 20774186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 20781da177e4SLinus Torvalds 20791da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 20801da177e4SLinus Torvalds int i, j, retval; 20811da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 20821da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 208383a07196SInaky Perez-Gonzalez char *speed, *type; 20841da177e4SLinus Torvalds 20851da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 20861da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 20871da177e4SLinus Torvalds */ 20881da177e4SLinus Torvalds if (!hdev->parent) { 20891da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 20901da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 20911da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 20921da177e4SLinus Torvalds } 20931da177e4SLinus Torvalds 20941da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 20951da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 20961da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 20971da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 20981da177e4SLinus Torvalds 20994186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 21001da177e4SLinus Torvalds 21011da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 21021da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 21031da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 21041da177e4SLinus Torvalds goto fail; 21051da177e4SLinus Torvalds /* success, speed is known */ 21061da177e4SLinus Torvalds retval = -ENODEV; 21071da177e4SLinus Torvalds 21081da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 21091da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 21101da177e4SLinus Torvalds goto fail; 21111da177e4SLinus Torvalds } 21121da177e4SLinus Torvalds oldspeed = udev->speed; 21131da177e4SLinus Torvalds 21141da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 21151da177e4SLinus Torvalds * it's fixed size except for full speed devices. 21165bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 21175bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 21181da177e4SLinus Torvalds */ 21191da177e4SLinus Torvalds switch (udev->speed) { 21205bb6e0aeSInaky Perez-Gonzalez case USB_SPEED_VARIABLE: /* fixed at 512 */ 21215bb6e0aeSInaky Perez-Gonzalez udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512); 21225bb6e0aeSInaky Perez-Gonzalez break; 21231da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 21241da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); 21251da177e4SLinus Torvalds break; 21261da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 21271da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 21281da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 21291da177e4SLinus Torvalds * then correct our initial guess. 21301da177e4SLinus Torvalds */ 21311da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); 21321da177e4SLinus Torvalds break; 21331da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 21341da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8); 21351da177e4SLinus Torvalds break; 21361da177e4SLinus Torvalds default: 21371da177e4SLinus Torvalds goto fail; 21381da177e4SLinus Torvalds } 21391da177e4SLinus Torvalds 214083a07196SInaky Perez-Gonzalez type = ""; 214183a07196SInaky Perez-Gonzalez switch (udev->speed) { 21421da177e4SLinus Torvalds case USB_SPEED_LOW: speed = "low"; break; 21431da177e4SLinus Torvalds case USB_SPEED_FULL: speed = "full"; break; 21441da177e4SLinus Torvalds case USB_SPEED_HIGH: speed = "high"; break; 214583a07196SInaky Perez-Gonzalez case USB_SPEED_VARIABLE: 214683a07196SInaky Perez-Gonzalez speed = "variable"; 214783a07196SInaky Perez-Gonzalez type = "Wireless "; 214883a07196SInaky Perez-Gonzalez break; 21491da177e4SLinus Torvalds default: speed = "?"; break; 215083a07196SInaky Perez-Gonzalez } 215183a07196SInaky Perez-Gonzalez dev_info (&udev->dev, 215283a07196SInaky Perez-Gonzalez "%s %s speed %sUSB device using %s and address %d\n", 215383a07196SInaky Perez-Gonzalez (udev->config) ? "reset" : "new", speed, type, 215483a07196SInaky Perez-Gonzalez udev->bus->controller->driver->name, udev->devnum); 21551da177e4SLinus Torvalds 21561da177e4SLinus Torvalds /* Set up TT records, if needed */ 21571da177e4SLinus Torvalds if (hdev->tt) { 21581da177e4SLinus Torvalds udev->tt = hdev->tt; 21591da177e4SLinus Torvalds udev->ttport = hdev->ttport; 21601da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 21611da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 21621da177e4SLinus Torvalds udev->tt = &hub->tt; 21631da177e4SLinus Torvalds udev->ttport = port1; 21641da177e4SLinus Torvalds } 21651da177e4SLinus Torvalds 21661da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 21671da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 21681da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 21691da177e4SLinus Torvalds * Change it cautiously. 21701da177e4SLinus Torvalds * 21711da177e4SLinus Torvalds * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 21721da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 21731da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 21741da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 21751da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 21761da177e4SLinus Torvalds * value. 21771da177e4SLinus Torvalds */ 21781da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 21791da177e4SLinus Torvalds if (USE_NEW_SCHEME(retry_counter)) { 21801da177e4SLinus Torvalds struct usb_device_descriptor *buf; 21811da177e4SLinus Torvalds int r = 0; 21821da177e4SLinus Torvalds 21831da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 21841da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 21851da177e4SLinus Torvalds if (!buf) { 21861da177e4SLinus Torvalds retval = -ENOMEM; 21871da177e4SLinus Torvalds continue; 21881da177e4SLinus Torvalds } 21891da177e4SLinus Torvalds 21901da177e4SLinus Torvalds /* Use a short timeout the first time through, 21911da177e4SLinus Torvalds * so that recalcitrant full-speed devices with 21921da177e4SLinus Torvalds * 8- or 16-byte ep0-maxpackets won't slow things 21931da177e4SLinus Torvalds * down tremendously by NAKing the unexpectedly 21941da177e4SLinus Torvalds * early status stage. Also, retry on all errors; 21951da177e4SLinus Torvalds * some devices are flakey. 21965bb6e0aeSInaky Perez-Gonzalez * 255 is for WUSB devices, we actually need to use 512. 21975bb6e0aeSInaky Perez-Gonzalez * WUSB1.0[4.8.1]. 21981da177e4SLinus Torvalds */ 21991da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 22001da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 22011da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 22021da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 22031da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 22041da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 22051da177e4SLinus Torvalds (i ? USB_CTRL_GET_TIMEOUT : 1000)); 22061da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 22075bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 22081da177e4SLinus Torvalds if (buf->bDescriptorType == 22091da177e4SLinus Torvalds USB_DT_DEVICE) { 22101da177e4SLinus Torvalds r = 0; 22111da177e4SLinus Torvalds break; 22121da177e4SLinus Torvalds } 22131da177e4SLinus Torvalds /* FALL THROUGH */ 22141da177e4SLinus Torvalds default: 22151da177e4SLinus Torvalds if (r == 0) 22161da177e4SLinus Torvalds r = -EPROTO; 22171da177e4SLinus Torvalds break; 22181da177e4SLinus Torvalds } 22191da177e4SLinus Torvalds if (r == 0) 22201da177e4SLinus Torvalds break; 22211da177e4SLinus Torvalds } 22221da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 22231da177e4SLinus Torvalds buf->bMaxPacketSize0; 22241da177e4SLinus Torvalds kfree(buf); 22251da177e4SLinus Torvalds 22261da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 22271da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 22281da177e4SLinus Torvalds goto fail; 22291da177e4SLinus Torvalds if (oldspeed != udev->speed) { 22301da177e4SLinus Torvalds dev_dbg(&udev->dev, 22311da177e4SLinus Torvalds "device reset changed speed!\n"); 22321da177e4SLinus Torvalds retval = -ENODEV; 22331da177e4SLinus Torvalds goto fail; 22341da177e4SLinus Torvalds } 22351da177e4SLinus Torvalds if (r) { 22361da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor " 22371da177e4SLinus Torvalds "read/%s, error %d\n", 22381da177e4SLinus Torvalds "64", r); 22391da177e4SLinus Torvalds retval = -EMSGSIZE; 22401da177e4SLinus Torvalds continue; 22411da177e4SLinus Torvalds } 22421da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 22431da177e4SLinus Torvalds } 22441da177e4SLinus Torvalds 22451da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 22461da177e4SLinus Torvalds retval = hub_set_address(udev); 22471da177e4SLinus Torvalds if (retval >= 0) 22481da177e4SLinus Torvalds break; 22491da177e4SLinus Torvalds msleep(200); 22501da177e4SLinus Torvalds } 22511da177e4SLinus Torvalds if (retval < 0) { 22521da177e4SLinus Torvalds dev_err(&udev->dev, 22531da177e4SLinus Torvalds "device not accepting address %d, error %d\n", 22541da177e4SLinus Torvalds udev->devnum, retval); 22551da177e4SLinus Torvalds goto fail; 22561da177e4SLinus Torvalds } 22571da177e4SLinus Torvalds 22581da177e4SLinus Torvalds /* cope with hardware quirkiness: 22591da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 22601da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 22611da177e4SLinus Torvalds */ 22621da177e4SLinus Torvalds msleep(10); 22631da177e4SLinus Torvalds if (USE_NEW_SCHEME(retry_counter)) 22641da177e4SLinus Torvalds break; 22651da177e4SLinus Torvalds 22661da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 22671da177e4SLinus Torvalds if (retval < 8) { 22681da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor " 22691da177e4SLinus Torvalds "read/%s, error %d\n", 22701da177e4SLinus Torvalds "8", retval); 22711da177e4SLinus Torvalds if (retval >= 0) 22721da177e4SLinus Torvalds retval = -EMSGSIZE; 22731da177e4SLinus Torvalds } else { 22741da177e4SLinus Torvalds retval = 0; 22751da177e4SLinus Torvalds break; 22761da177e4SLinus Torvalds } 22771da177e4SLinus Torvalds } 22781da177e4SLinus Torvalds if (retval) 22791da177e4SLinus Torvalds goto fail; 22801da177e4SLinus Torvalds 22815bb6e0aeSInaky Perez-Gonzalez i = udev->descriptor.bMaxPacketSize0 == 0xff? 22825bb6e0aeSInaky Perez-Gonzalez 512 : udev->descriptor.bMaxPacketSize0; 22831da177e4SLinus Torvalds if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { 22841da177e4SLinus Torvalds if (udev->speed != USB_SPEED_FULL || 22851da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 22861da177e4SLinus Torvalds dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); 22871da177e4SLinus Torvalds retval = -EMSGSIZE; 22881da177e4SLinus Torvalds goto fail; 22891da177e4SLinus Torvalds } 22901da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 22911da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 22921da177e4SLinus Torvalds ep0_reinit(udev); 22931da177e4SLinus Torvalds } 22941da177e4SLinus Torvalds 22951da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 22961da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 22971da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor read/%s, error %d\n", 22981da177e4SLinus Torvalds "all", retval); 22991da177e4SLinus Torvalds if (retval >= 0) 23001da177e4SLinus Torvalds retval = -ENOMSG; 23011da177e4SLinus Torvalds goto fail; 23021da177e4SLinus Torvalds } 23031da177e4SLinus Torvalds 23041da177e4SLinus Torvalds retval = 0; 23051da177e4SLinus Torvalds 23061da177e4SLinus Torvalds fail: 23071da177e4SLinus Torvalds if (retval) 23081da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 23094186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 23101da177e4SLinus Torvalds return retval; 23111da177e4SLinus Torvalds } 23121da177e4SLinus Torvalds 23131da177e4SLinus Torvalds static void 23141da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 23151da177e4SLinus Torvalds { 23161da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 23171da177e4SLinus Torvalds int status; 23181da177e4SLinus Torvalds 23191da177e4SLinus Torvalds qual = kmalloc (sizeof *qual, SLAB_KERNEL); 23201da177e4SLinus Torvalds if (qual == NULL) 23211da177e4SLinus Torvalds return; 23221da177e4SLinus Torvalds 23231da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 23241da177e4SLinus Torvalds qual, sizeof *qual); 23251da177e4SLinus Torvalds if (status == sizeof *qual) { 23261da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 23271da177e4SLinus Torvalds "connect to a high speed hub\n"); 23281da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 23291da177e4SLinus Torvalds if (hub->has_indicators) { 23301da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 23311da177e4SLinus Torvalds schedule_work (&hub->leds); 23321da177e4SLinus Torvalds } 23331da177e4SLinus Torvalds } 23341da177e4SLinus Torvalds kfree(qual); 23351da177e4SLinus Torvalds } 23361da177e4SLinus Torvalds 23371da177e4SLinus Torvalds static unsigned 23381da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 23391da177e4SLinus Torvalds { 23401da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 23411da177e4SLinus Torvalds int remaining; 234255c52718SAlan Stern int port1; 23431da177e4SLinus Torvalds 234455c52718SAlan Stern if (!hub->limited_power) 23451da177e4SLinus Torvalds return 0; 23461da177e4SLinus Torvalds 234755c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 234855c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 234955c52718SAlan Stern struct usb_device *udev = hdev->children[port1 - 1]; 235055c52718SAlan Stern int delta; 23511da177e4SLinus Torvalds 23521da177e4SLinus Torvalds if (!udev) 23531da177e4SLinus Torvalds continue; 23541da177e4SLinus Torvalds 235555c52718SAlan Stern /* Unconfigured devices may not use more than 100mA, 235655c52718SAlan Stern * or 8mA for OTG ports */ 23571da177e4SLinus Torvalds if (udev->actconfig) 235855c52718SAlan Stern delta = udev->actconfig->desc.bMaxPower * 2; 235955c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 236055c52718SAlan Stern delta = 100; 23611da177e4SLinus Torvalds else 236255c52718SAlan Stern delta = 8; 236355c52718SAlan Stern if (delta > hub->mA_per_port) 236455c52718SAlan Stern dev_warn(&udev->dev, "%dmA is over %umA budget " 236555c52718SAlan Stern "for port %d!\n", 236655c52718SAlan Stern delta, hub->mA_per_port, port1); 23671da177e4SLinus Torvalds remaining -= delta; 23681da177e4SLinus Torvalds } 23691da177e4SLinus Torvalds if (remaining < 0) { 237055c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 237155c52718SAlan Stern - remaining); 23721da177e4SLinus Torvalds remaining = 0; 23731da177e4SLinus Torvalds } 23741da177e4SLinus Torvalds return remaining; 23751da177e4SLinus Torvalds } 23761da177e4SLinus Torvalds 23771da177e4SLinus Torvalds /* Handle physical or logical connection change events. 23781da177e4SLinus Torvalds * This routine is called when: 23791da177e4SLinus Torvalds * a port connection-change occurs; 23801da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 23811da177e4SLinus Torvalds * usb_reset_device() encounters changed descriptors (as from 23821da177e4SLinus Torvalds * a firmware download) 23831da177e4SLinus Torvalds * caller already locked the hub 23841da177e4SLinus Torvalds */ 23851da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 23861da177e4SLinus Torvalds u16 portstatus, u16 portchange) 23871da177e4SLinus Torvalds { 23881da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 23891da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 239074ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 23911da177e4SLinus Torvalds int status, i; 23921da177e4SLinus Torvalds 23931da177e4SLinus Torvalds dev_dbg (hub_dev, 23941da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 23951da177e4SLinus Torvalds port1, portstatus, portchange, portspeed (portstatus)); 23961da177e4SLinus Torvalds 23971da177e4SLinus Torvalds if (hub->has_indicators) { 23981da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 23991da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 24001da177e4SLinus Torvalds } 24011da177e4SLinus Torvalds 24021da177e4SLinus Torvalds /* Disconnect any existing devices under this port */ 24031da177e4SLinus Torvalds if (hdev->children[port1-1]) 24041da177e4SLinus Torvalds usb_disconnect(&hdev->children[port1-1]); 24051da177e4SLinus Torvalds clear_bit(port1, hub->change_bits); 24061da177e4SLinus Torvalds 24071da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 24081da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 24091da177e4SLinus Torvalds if (hdev->bus->is_b_host) 24101da177e4SLinus Torvalds portchange &= ~USB_PORT_STAT_C_CONNECTION; 24111da177e4SLinus Torvalds #endif 24121da177e4SLinus Torvalds 24131da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 24141da177e4SLinus Torvalds status = hub_port_debounce(hub, port1); 24151da177e4SLinus Torvalds if (status < 0) { 24161da177e4SLinus Torvalds dev_err (hub_dev, 24171da177e4SLinus Torvalds "connect-debounce failed, port %d disabled\n", 24181da177e4SLinus Torvalds port1); 24191da177e4SLinus Torvalds goto done; 24201da177e4SLinus Torvalds } 24211da177e4SLinus Torvalds portstatus = status; 24221da177e4SLinus Torvalds } 24231da177e4SLinus Torvalds 24241da177e4SLinus Torvalds /* Return now if nothing is connected */ 24251da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) { 24261da177e4SLinus Torvalds 24271da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 242874ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 24291da177e4SLinus Torvalds && !(portstatus & (1 << USB_PORT_FEAT_POWER))) 24301da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 24311da177e4SLinus Torvalds 24321da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 24331da177e4SLinus Torvalds goto done; 24341da177e4SLinus Torvalds return; 24351da177e4SLinus Torvalds } 24361da177e4SLinus Torvalds 24371da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 24381da177e4SLinus Torvalds /* If something is connected, but the port is suspended, wake it up. */ 24391da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_SUSPEND) { 24401da177e4SLinus Torvalds status = hub_port_resume(hub, port1, NULL); 24411da177e4SLinus Torvalds if (status < 0) { 24421da177e4SLinus Torvalds dev_dbg(hub_dev, 24431da177e4SLinus Torvalds "can't clear suspend on port %d; %d\n", 24441da177e4SLinus Torvalds port1, status); 24451da177e4SLinus Torvalds goto done; 24461da177e4SLinus Torvalds } 24471da177e4SLinus Torvalds } 24481da177e4SLinus Torvalds #endif 24491da177e4SLinus Torvalds 24501da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 24511da177e4SLinus Torvalds struct usb_device *udev; 24521da177e4SLinus Torvalds 24531da177e4SLinus Torvalds /* reallocate for each attempt, since references 24541da177e4SLinus Torvalds * to the previous one can escape in various ways 24551da177e4SLinus Torvalds */ 24561da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 24571da177e4SLinus Torvalds if (!udev) { 24581da177e4SLinus Torvalds dev_err (hub_dev, 24591da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 24601da177e4SLinus Torvalds port1); 24611da177e4SLinus Torvalds goto done; 24621da177e4SLinus Torvalds } 24631da177e4SLinus Torvalds 24641da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 24651da177e4SLinus Torvalds udev->speed = USB_SPEED_UNKNOWN; 246655c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 2467b6956ffaSAlan Stern udev->level = hdev->level + 1; 24681da177e4SLinus Torvalds 24691da177e4SLinus Torvalds /* set the address */ 24701da177e4SLinus Torvalds choose_address(udev); 24711da177e4SLinus Torvalds if (udev->devnum <= 0) { 24721da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 24731da177e4SLinus Torvalds goto loop; 24741da177e4SLinus Torvalds } 24751da177e4SLinus Torvalds 24761da177e4SLinus Torvalds /* reset and get descriptor */ 24771da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 24781da177e4SLinus Torvalds if (status < 0) 24791da177e4SLinus Torvalds goto loop; 24801da177e4SLinus Torvalds 24811da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 24821da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 24831da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 24841da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 24851da177e4SLinus Torvalds * on the parent. 24861da177e4SLinus Torvalds */ 24871da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 248855c52718SAlan Stern && udev->bus_mA <= 100) { 24891da177e4SLinus Torvalds u16 devstat; 24901da177e4SLinus Torvalds 24911da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 24921da177e4SLinus Torvalds &devstat); 249355c52718SAlan Stern if (status < 2) { 24941da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 24951da177e4SLinus Torvalds goto loop_disable; 24961da177e4SLinus Torvalds } 249755c52718SAlan Stern le16_to_cpus(&devstat); 24981da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 24991da177e4SLinus Torvalds dev_err(&udev->dev, 25001da177e4SLinus Torvalds "can't connect bus-powered hub " 25011da177e4SLinus Torvalds "to this port\n"); 25021da177e4SLinus Torvalds if (hub->has_indicators) { 25031da177e4SLinus Torvalds hub->indicator[port1-1] = 25041da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 25051da177e4SLinus Torvalds schedule_work (&hub->leds); 25061da177e4SLinus Torvalds } 25071da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 25081da177e4SLinus Torvalds goto loop_disable; 25091da177e4SLinus Torvalds } 25101da177e4SLinus Torvalds } 25111da177e4SLinus Torvalds 25121da177e4SLinus Torvalds /* check for devices running slower than they could */ 25131da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 25141da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 25151da177e4SLinus Torvalds && highspeed_hubs != 0) 25161da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 25171da177e4SLinus Torvalds 25181da177e4SLinus Torvalds /* Store the parent's children[] pointer. At this point 25191da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 25201da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 25211da177e4SLinus Torvalds */ 25221da177e4SLinus Torvalds status = 0; 25231da177e4SLinus Torvalds 25241da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 25251da177e4SLinus Torvalds * been disconnected; we would race with the 25261da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 25271da177e4SLinus Torvalds */ 25281da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 25291da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 25301da177e4SLinus Torvalds status = -ENOTCONN; 25311da177e4SLinus Torvalds else 25321da177e4SLinus Torvalds hdev->children[port1-1] = udev; 25331da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 25341da177e4SLinus Torvalds 25351da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 25361da177e4SLinus Torvalds if (!status) { 25371da177e4SLinus Torvalds status = usb_new_device(udev); 25381da177e4SLinus Torvalds if (status) { 25391da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 25401da177e4SLinus Torvalds hdev->children[port1-1] = NULL; 25411da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 25421da177e4SLinus Torvalds } 25431da177e4SLinus Torvalds } 25441da177e4SLinus Torvalds 25451da177e4SLinus Torvalds if (status) 25461da177e4SLinus Torvalds goto loop_disable; 25471da177e4SLinus Torvalds 25481da177e4SLinus Torvalds status = hub_power_remaining(hub); 25491da177e4SLinus Torvalds if (status) 255055c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 25511da177e4SLinus Torvalds 25521da177e4SLinus Torvalds return; 25531da177e4SLinus Torvalds 25541da177e4SLinus Torvalds loop_disable: 25551da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 25561da177e4SLinus Torvalds loop: 25571da177e4SLinus Torvalds ep0_reinit(udev); 25581da177e4SLinus Torvalds release_address(udev); 25591da177e4SLinus Torvalds usb_put_dev(udev); 25601da177e4SLinus Torvalds if (status == -ENOTCONN) 25611da177e4SLinus Torvalds break; 25621da177e4SLinus Torvalds } 25631da177e4SLinus Torvalds 25641da177e4SLinus Torvalds done: 25651da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 25661da177e4SLinus Torvalds } 25671da177e4SLinus Torvalds 25681da177e4SLinus Torvalds static void hub_events(void) 25691da177e4SLinus Torvalds { 25701da177e4SLinus Torvalds struct list_head *tmp; 25711da177e4SLinus Torvalds struct usb_device *hdev; 25721da177e4SLinus Torvalds struct usb_interface *intf; 25731da177e4SLinus Torvalds struct usb_hub *hub; 25741da177e4SLinus Torvalds struct device *hub_dev; 25751da177e4SLinus Torvalds u16 hubstatus; 25761da177e4SLinus Torvalds u16 hubchange; 25771da177e4SLinus Torvalds u16 portstatus; 25781da177e4SLinus Torvalds u16 portchange; 25791da177e4SLinus Torvalds int i, ret; 25801da177e4SLinus Torvalds int connect_change; 25811da177e4SLinus Torvalds 25821da177e4SLinus Torvalds /* 25831da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 25841da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 25851da177e4SLinus Torvalds * safe since we delete the hub from the event list. 25861da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 25871da177e4SLinus Torvalds */ 25881da177e4SLinus Torvalds while (1) { 25891da177e4SLinus Torvalds 25901da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 25911da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 25921da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 25931da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 25941da177e4SLinus Torvalds break; 25951da177e4SLinus Torvalds } 25961da177e4SLinus Torvalds 25971da177e4SLinus Torvalds tmp = hub_event_list.next; 25981da177e4SLinus Torvalds list_del_init(tmp); 25991da177e4SLinus Torvalds 26001da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 26011da177e4SLinus Torvalds hdev = hub->hdev; 26021da177e4SLinus Torvalds intf = to_usb_interface(hub->intfdev); 26031da177e4SLinus Torvalds hub_dev = &intf->dev; 26041da177e4SLinus Torvalds 2605979d5199SDavid Brownell i = hub->resume_root_hub; 2606979d5199SDavid Brownell 2607979d5199SDavid Brownell dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n", 26081da177e4SLinus Torvalds hdev->state, hub->descriptor 26091da177e4SLinus Torvalds ? hub->descriptor->bNbrPorts 26101da177e4SLinus Torvalds : 0, 26111da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 26121da177e4SLinus Torvalds (u16) hub->change_bits[0], 2613979d5199SDavid Brownell (u16) hub->event_bits[0], 2614979d5199SDavid Brownell i ? ", resume root" : ""); 26151da177e4SLinus Torvalds 26161da177e4SLinus Torvalds usb_get_intf(intf); 26171da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 26181da177e4SLinus Torvalds 26191da177e4SLinus Torvalds /* Lock the device, then check to see if we were 26201da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 26211da177e4SLinus Torvalds if (locktree(hdev) < 0) { 26221da177e4SLinus Torvalds usb_put_intf(intf); 26231da177e4SLinus Torvalds continue; 26241da177e4SLinus Torvalds } 26251da177e4SLinus Torvalds if (hub != usb_get_intfdata(intf)) 26261da177e4SLinus Torvalds goto loop; 26271da177e4SLinus Torvalds 26281da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 26291da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 26307de18d8bSAlan Stern hub->error = -ENODEV; 26317de18d8bSAlan Stern hub_pre_reset(intf); 26321da177e4SLinus Torvalds goto loop; 26331da177e4SLinus Torvalds } 26341da177e4SLinus Torvalds 2635a8e7c565SAlan Stern /* Is this is a root hub wanting to reactivate the downstream 2636a8e7c565SAlan Stern * ports? If so, be sure the interface resumes even if its 2637a8e7c565SAlan Stern * stub "device" node was never suspended. 2638a8e7c565SAlan Stern */ 2639a8e7c565SAlan Stern if (i) 2640645daaabSAlan Stern usb_autoresume_device(hdev, 0); 2641a8e7c565SAlan Stern 26421da177e4SLinus Torvalds /* If this is an inactive or suspended hub, do nothing */ 26431da177e4SLinus Torvalds if (hub->quiescing) 26441da177e4SLinus Torvalds goto loop; 26451da177e4SLinus Torvalds 26461da177e4SLinus Torvalds if (hub->error) { 26471da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 26481da177e4SLinus Torvalds hub->error); 26491da177e4SLinus Torvalds 26507de18d8bSAlan Stern ret = usb_reset_composite_device(hdev, intf); 26511da177e4SLinus Torvalds if (ret) { 26521da177e4SLinus Torvalds dev_dbg (hub_dev, 26531da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 26541da177e4SLinus Torvalds goto loop; 26551da177e4SLinus Torvalds } 26561da177e4SLinus Torvalds 26571da177e4SLinus Torvalds hub->nerrors = 0; 26581da177e4SLinus Torvalds hub->error = 0; 26591da177e4SLinus Torvalds } 26601da177e4SLinus Torvalds 26611da177e4SLinus Torvalds /* deal with port status changes */ 26621da177e4SLinus Torvalds for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { 26631da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 26641da177e4SLinus Torvalds continue; 26651da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 26661da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 26671da177e4SLinus Torvalds !connect_change && !hub->activating) 26681da177e4SLinus Torvalds continue; 26691da177e4SLinus Torvalds 26701da177e4SLinus Torvalds ret = hub_port_status(hub, i, 26711da177e4SLinus Torvalds &portstatus, &portchange); 26721da177e4SLinus Torvalds if (ret < 0) 26731da177e4SLinus Torvalds continue; 26741da177e4SLinus Torvalds 26751da177e4SLinus Torvalds if (hub->activating && !hdev->children[i-1] && 26761da177e4SLinus Torvalds (portstatus & 26771da177e4SLinus Torvalds USB_PORT_STAT_CONNECTION)) 26781da177e4SLinus Torvalds connect_change = 1; 26791da177e4SLinus Torvalds 26801da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 26811da177e4SLinus Torvalds clear_port_feature(hdev, i, 26821da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 26831da177e4SLinus Torvalds connect_change = 1; 26841da177e4SLinus Torvalds } 26851da177e4SLinus Torvalds 26861da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 26871da177e4SLinus Torvalds if (!connect_change) 26881da177e4SLinus Torvalds dev_dbg (hub_dev, 26891da177e4SLinus Torvalds "port %d enable change, " 26901da177e4SLinus Torvalds "status %08x\n", 26911da177e4SLinus Torvalds i, portstatus); 26921da177e4SLinus Torvalds clear_port_feature(hdev, i, 26931da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 26941da177e4SLinus Torvalds 26951da177e4SLinus Torvalds /* 26961da177e4SLinus Torvalds * EM interference sometimes causes badly 26971da177e4SLinus Torvalds * shielded USB devices to be shutdown by 26981da177e4SLinus Torvalds * the hub, this hack enables them again. 26991da177e4SLinus Torvalds * Works at least with mouse driver. 27001da177e4SLinus Torvalds */ 27011da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 27021da177e4SLinus Torvalds && !connect_change 27031da177e4SLinus Torvalds && hdev->children[i-1]) { 27041da177e4SLinus Torvalds dev_err (hub_dev, 27051da177e4SLinus Torvalds "port %i " 27061da177e4SLinus Torvalds "disabled by hub (EMI?), " 27071da177e4SLinus Torvalds "re-enabling...\n", 27081da177e4SLinus Torvalds i); 27091da177e4SLinus Torvalds connect_change = 1; 27101da177e4SLinus Torvalds } 27111da177e4SLinus Torvalds } 27121da177e4SLinus Torvalds 27131da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_SUSPEND) { 27141da177e4SLinus Torvalds clear_port_feature(hdev, i, 27151da177e4SLinus Torvalds USB_PORT_FEAT_C_SUSPEND); 27161da177e4SLinus Torvalds if (hdev->children[i-1]) { 27171da177e4SLinus Torvalds ret = remote_wakeup(hdev-> 27181da177e4SLinus Torvalds children[i-1]); 27191da177e4SLinus Torvalds if (ret < 0) 27201da177e4SLinus Torvalds connect_change = 1; 27211da177e4SLinus Torvalds } else { 27221da177e4SLinus Torvalds ret = -ENODEV; 27231da177e4SLinus Torvalds hub_port_disable(hub, i, 1); 27241da177e4SLinus Torvalds } 27251da177e4SLinus Torvalds dev_dbg (hub_dev, 27261da177e4SLinus Torvalds "resume on port %d, status %d\n", 27271da177e4SLinus Torvalds i, ret); 27281da177e4SLinus Torvalds } 27291da177e4SLinus Torvalds 27301da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 27311da177e4SLinus Torvalds dev_err (hub_dev, 27321da177e4SLinus Torvalds "over-current change on port %d\n", 27331da177e4SLinus Torvalds i); 27341da177e4SLinus Torvalds clear_port_feature(hdev, i, 27351da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 27361da177e4SLinus Torvalds hub_power_on(hub); 27371da177e4SLinus Torvalds } 27381da177e4SLinus Torvalds 27391da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 27401da177e4SLinus Torvalds dev_dbg (hub_dev, 27411da177e4SLinus Torvalds "reset change on port %d\n", 27421da177e4SLinus Torvalds i); 27431da177e4SLinus Torvalds clear_port_feature(hdev, i, 27441da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 27451da177e4SLinus Torvalds } 27461da177e4SLinus Torvalds 27471da177e4SLinus Torvalds if (connect_change) 27481da177e4SLinus Torvalds hub_port_connect_change(hub, i, 27491da177e4SLinus Torvalds portstatus, portchange); 27501da177e4SLinus Torvalds } /* end for i */ 27511da177e4SLinus Torvalds 27521da177e4SLinus Torvalds /* deal with hub status changes */ 27531da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 27541da177e4SLinus Torvalds ; /* do nothing */ 27551da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 27561da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 27571da177e4SLinus Torvalds else { 27581da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 27591da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 27601da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 276155c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 276255c52718SAlan Stern /* FIXME: Is this always true? */ 276355c52718SAlan Stern hub->limited_power = 0; 276455c52718SAlan Stern else 276555c52718SAlan Stern hub->limited_power = 1; 27661da177e4SLinus Torvalds } 27671da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 27681da177e4SLinus Torvalds dev_dbg (hub_dev, "overcurrent change\n"); 27691da177e4SLinus Torvalds msleep(500); /* Cool down */ 27701da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 27711da177e4SLinus Torvalds hub_power_on(hub); 27721da177e4SLinus Torvalds } 27731da177e4SLinus Torvalds } 27741da177e4SLinus Torvalds 27751da177e4SLinus Torvalds hub->activating = 0; 27761da177e4SLinus Torvalds 2777d5926ae7SAlan Stern /* If this is a root hub, tell the HCD it's okay to 2778d5926ae7SAlan Stern * re-enable port-change interrupts now. */ 2779d5cbad4bSAlan Stern if (!hdev->parent && !hub->busy_bits[0]) 2780d5926ae7SAlan Stern usb_enable_root_hub_irq(hdev->bus); 2781d5926ae7SAlan Stern 27821da177e4SLinus Torvalds loop: 27831da177e4SLinus Torvalds usb_unlock_device(hdev); 27841da177e4SLinus Torvalds usb_put_intf(intf); 27851da177e4SLinus Torvalds 27861da177e4SLinus Torvalds } /* end while (1) */ 27871da177e4SLinus Torvalds } 27881da177e4SLinus Torvalds 27891da177e4SLinus Torvalds static int hub_thread(void *__unused) 27901da177e4SLinus Torvalds { 27911da177e4SLinus Torvalds do { 27921da177e4SLinus Torvalds hub_events(); 27939c8d6178Sakpm@osdl.org wait_event_interruptible(khubd_wait, 27949c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 27959c8d6178Sakpm@osdl.org kthread_should_stop()); 27963e1d1d28SChristoph Lameter try_to_freeze(); 27979c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 27981da177e4SLinus Torvalds 27991da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 28009c8d6178Sakpm@osdl.org return 0; 28011da177e4SLinus Torvalds } 28021da177e4SLinus Torvalds 28031da177e4SLinus Torvalds static struct usb_device_id hub_id_table [] = { 28041da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 28051da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 28061da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 28071da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 28081da177e4SLinus Torvalds { } /* Terminating entry */ 28091da177e4SLinus Torvalds }; 28101da177e4SLinus Torvalds 28111da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 28121da177e4SLinus Torvalds 28131da177e4SLinus Torvalds static struct usb_driver hub_driver = { 28141da177e4SLinus Torvalds .name = "hub", 28151da177e4SLinus Torvalds .probe = hub_probe, 28161da177e4SLinus Torvalds .disconnect = hub_disconnect, 28171da177e4SLinus Torvalds .suspend = hub_suspend, 28181da177e4SLinus Torvalds .resume = hub_resume, 28197de18d8bSAlan Stern .pre_reset = hub_pre_reset, 28207de18d8bSAlan Stern .post_reset = hub_post_reset, 28211da177e4SLinus Torvalds .ioctl = hub_ioctl, 28221da177e4SLinus Torvalds .id_table = hub_id_table, 28231da177e4SLinus Torvalds }; 28241da177e4SLinus Torvalds 28251da177e4SLinus Torvalds int usb_hub_init(void) 28261da177e4SLinus Torvalds { 28271da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 28281da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 28291da177e4SLinus Torvalds usbcore_name); 28301da177e4SLinus Torvalds return -1; 28311da177e4SLinus Torvalds } 28321da177e4SLinus Torvalds 28339c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 28349c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 28351da177e4SLinus Torvalds return 0; 28361da177e4SLinus Torvalds 28371da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 28381da177e4SLinus Torvalds usb_deregister(&hub_driver); 28391da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 28401da177e4SLinus Torvalds 28411da177e4SLinus Torvalds return -1; 28421da177e4SLinus Torvalds } 28431da177e4SLinus Torvalds 28441da177e4SLinus Torvalds void usb_hub_cleanup(void) 28451da177e4SLinus Torvalds { 28469c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 28471da177e4SLinus Torvalds 28481da177e4SLinus Torvalds /* 28491da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 28501da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 28511da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 28521da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 28531da177e4SLinus Torvalds * individual hub resources. -greg 28541da177e4SLinus Torvalds */ 28551da177e4SLinus Torvalds usb_deregister(&hub_driver); 28561da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 28571da177e4SLinus Torvalds 28581da177e4SLinus Torvalds static int config_descriptors_changed(struct usb_device *udev) 28591da177e4SLinus Torvalds { 28601da177e4SLinus Torvalds unsigned index; 28611da177e4SLinus Torvalds unsigned len = 0; 28621da177e4SLinus Torvalds struct usb_config_descriptor *buf; 28631da177e4SLinus Torvalds 28641da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 28651da177e4SLinus Torvalds if (len < le16_to_cpu(udev->config[index].desc.wTotalLength)) 28661da177e4SLinus Torvalds len = le16_to_cpu(udev->config[index].desc.wTotalLength); 28671da177e4SLinus Torvalds } 28681da177e4SLinus Torvalds buf = kmalloc (len, SLAB_KERNEL); 28691da177e4SLinus Torvalds if (buf == NULL) { 28701da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 28711da177e4SLinus Torvalds /* assume the worst */ 28721da177e4SLinus Torvalds return 1; 28731da177e4SLinus Torvalds } 28741da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 28751da177e4SLinus Torvalds int length; 28761da177e4SLinus Torvalds int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 28771da177e4SLinus Torvalds 28781da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 28791da177e4SLinus Torvalds old_length); 28801da177e4SLinus Torvalds if (length < old_length) { 28811da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 28821da177e4SLinus Torvalds index, length); 28831da177e4SLinus Torvalds break; 28841da177e4SLinus Torvalds } 28851da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 28861da177e4SLinus Torvalds != 0) { 28871da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 28881da177e4SLinus Torvalds index, buf->bConfigurationValue); 28891da177e4SLinus Torvalds break; 28901da177e4SLinus Torvalds } 28911da177e4SLinus Torvalds } 28921da177e4SLinus Torvalds kfree(buf); 28931da177e4SLinus Torvalds return index != udev->descriptor.bNumConfigurations; 28941da177e4SLinus Torvalds } 28951da177e4SLinus Torvalds 28961da177e4SLinus Torvalds /** 28971da177e4SLinus Torvalds * usb_reset_device - perform a USB port reset to reinitialize a device 28981da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 28991da177e4SLinus Torvalds * 290079efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 290179efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 290279efa097SAlan Stern * Use usb_reset_composite_device() instead. 29031da177e4SLinus Torvalds * 29041da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 29051da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 29061da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 29071da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 29081da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 29091da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 29101da177e4SLinus Torvalds * re-enumerated and probed all over again. 29111da177e4SLinus Torvalds * 29121da177e4SLinus Torvalds * Returns 0 if the reset succeeded, -ENODEV if the device has been 29131da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 29141da177e4SLinus Torvalds * if the reset wasn't even attempted. 29151da177e4SLinus Torvalds * 29161da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 29171da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 29181da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 29191da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 29201da177e4SLinus Torvalds */ 29211da177e4SLinus Torvalds int usb_reset_device(struct usb_device *udev) 29221da177e4SLinus Torvalds { 29231da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 29241da177e4SLinus Torvalds struct usb_hub *parent_hub; 29251da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 292612c3da34SAlan Stern int i, ret = 0; 292712c3da34SAlan Stern int port1 = udev->portnum; 29281da177e4SLinus Torvalds 29291da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 29301da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 29311da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 29321da177e4SLinus Torvalds udev->state); 29331da177e4SLinus Torvalds return -EINVAL; 29341da177e4SLinus Torvalds } 29351da177e4SLinus Torvalds 29361da177e4SLinus Torvalds if (!parent_hdev) { 29371da177e4SLinus Torvalds /* this requires hcd-specific logic; see OHCI hc_restart() */ 29381da177e4SLinus Torvalds dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__); 29391da177e4SLinus Torvalds return -EISDIR; 29401da177e4SLinus Torvalds } 29411da177e4SLinus Torvalds parent_hub = hdev_to_hub(parent_hdev); 29421da177e4SLinus Torvalds 29431da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 29441da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 29451da177e4SLinus Torvalds 29461da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 29471da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 29481da177e4SLinus Torvalds ep0_reinit(udev); 29491da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 29501da177e4SLinus Torvalds if (ret >= 0) 29511da177e4SLinus Torvalds break; 29521da177e4SLinus Torvalds } 29531da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 2954d5cbad4bSAlan Stern if (!parent_hdev->parent && !parent_hub->busy_bits[0]) 2955d5cbad4bSAlan Stern usb_enable_root_hub_irq(parent_hdev->bus); 2956d5cbad4bSAlan Stern 29571da177e4SLinus Torvalds if (ret < 0) 29581da177e4SLinus Torvalds goto re_enumerate; 29591da177e4SLinus Torvalds 29601da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 29611da177e4SLinus Torvalds if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor) 29621da177e4SLinus Torvalds || config_descriptors_changed (udev)) { 29631da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 29641da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 29651da177e4SLinus Torvalds goto re_enumerate; 29661da177e4SLinus Torvalds } 29671da177e4SLinus Torvalds 29681da177e4SLinus Torvalds if (!udev->actconfig) 29691da177e4SLinus Torvalds goto done; 29701da177e4SLinus Torvalds 29711da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 29721da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 29731da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 29741da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 29751da177e4SLinus Torvalds if (ret < 0) { 29761da177e4SLinus Torvalds dev_err(&udev->dev, 29771da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 29781da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 29791da177e4SLinus Torvalds goto re_enumerate; 29801da177e4SLinus Torvalds } 29811da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 29821da177e4SLinus Torvalds 29831da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 29841da177e4SLinus Torvalds struct usb_interface *intf = udev->actconfig->interface[i]; 29851da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 29861da177e4SLinus Torvalds 29871da177e4SLinus Torvalds /* set_interface resets host side toggle even 29881da177e4SLinus Torvalds * for altsetting zero. the interface may have no driver. 29891da177e4SLinus Torvalds */ 29901da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 29911da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 29921da177e4SLinus Torvalds desc->bAlternateSetting); 29931da177e4SLinus Torvalds if (ret < 0) { 29941da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 29951da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 29961da177e4SLinus Torvalds desc->bInterfaceNumber, 29971da177e4SLinus Torvalds desc->bAlternateSetting, 29981da177e4SLinus Torvalds ret); 29991da177e4SLinus Torvalds goto re_enumerate; 30001da177e4SLinus Torvalds } 30011da177e4SLinus Torvalds } 30021da177e4SLinus Torvalds 30031da177e4SLinus Torvalds done: 30041da177e4SLinus Torvalds return 0; 30051da177e4SLinus Torvalds 30061da177e4SLinus Torvalds re_enumerate: 30071da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 30081da177e4SLinus Torvalds return -ENODEV; 30091da177e4SLinus Torvalds } 3010140d8f68SAlan Stern EXPORT_SYMBOL(usb_reset_device); 301179efa097SAlan Stern 301279efa097SAlan Stern /** 301379efa097SAlan Stern * usb_reset_composite_device - warn interface drivers and perform a USB port reset 301479efa097SAlan Stern * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 301579efa097SAlan Stern * @iface: interface bound to the driver making the request (optional) 301679efa097SAlan Stern * 301779efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 301879efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 301979efa097SAlan Stern * the reset is over (using their post_reset method). 302079efa097SAlan Stern * 302179efa097SAlan Stern * Return value is the same as for usb_reset_device(). 302279efa097SAlan Stern * 302379efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 302479efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 302579efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 302679efa097SAlan Stern * the device using usb_lock_device_for_reset(). 302779efa097SAlan Stern * 302879efa097SAlan Stern * The interface locks are acquired during the pre_reset stage and released 302979efa097SAlan Stern * during the post_reset stage. However if iface is not NULL and is 303079efa097SAlan Stern * currently being probed, we assume that the caller already owns its 303179efa097SAlan Stern * lock. 303279efa097SAlan Stern */ 303379efa097SAlan Stern int usb_reset_composite_device(struct usb_device *udev, 303479efa097SAlan Stern struct usb_interface *iface) 303579efa097SAlan Stern { 303679efa097SAlan Stern int ret; 303779efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 303879efa097SAlan Stern 303979efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 304079efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 304179efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 304279efa097SAlan Stern udev->state); 304379efa097SAlan Stern return -EINVAL; 304479efa097SAlan Stern } 304579efa097SAlan Stern 3046645daaabSAlan Stern /* Prevent autosuspend during the reset */ 3047645daaabSAlan Stern usb_autoresume_device(udev, 1); 3048645daaabSAlan Stern 304979efa097SAlan Stern if (iface && iface->condition != USB_INTERFACE_BINDING) 305079efa097SAlan Stern iface = NULL; 305179efa097SAlan Stern 305279efa097SAlan Stern if (config) { 305379efa097SAlan Stern int i; 305479efa097SAlan Stern struct usb_interface *cintf; 305579efa097SAlan Stern struct usb_driver *drv; 305679efa097SAlan Stern 305779efa097SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 305879efa097SAlan Stern cintf = config->interface[i]; 305979efa097SAlan Stern if (cintf != iface) 306079efa097SAlan Stern down(&cintf->dev.sem); 306179efa097SAlan Stern if (device_is_registered(&cintf->dev) && 306279efa097SAlan Stern cintf->dev.driver) { 306379efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 306479efa097SAlan Stern if (drv->pre_reset) 306579efa097SAlan Stern (drv->pre_reset)(cintf); 306679efa097SAlan Stern } 306779efa097SAlan Stern } 306879efa097SAlan Stern } 306979efa097SAlan Stern 307079efa097SAlan Stern ret = usb_reset_device(udev); 307179efa097SAlan Stern 307279efa097SAlan Stern if (config) { 307379efa097SAlan Stern int i; 307479efa097SAlan Stern struct usb_interface *cintf; 307579efa097SAlan Stern struct usb_driver *drv; 307679efa097SAlan Stern 307779efa097SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 307879efa097SAlan Stern cintf = config->interface[i]; 307979efa097SAlan Stern if (device_is_registered(&cintf->dev) && 308079efa097SAlan Stern cintf->dev.driver) { 308179efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 308279efa097SAlan Stern if (drv->post_reset) 308379efa097SAlan Stern (drv->post_reset)(cintf); 308479efa097SAlan Stern } 308579efa097SAlan Stern if (cintf != iface) 308679efa097SAlan Stern up(&cintf->dev.sem); 308779efa097SAlan Stern } 308879efa097SAlan Stern } 308979efa097SAlan Stern 3090645daaabSAlan Stern usb_autosuspend_device(udev, 1); 309179efa097SAlan Stern return ret; 309279efa097SAlan Stern } 3093140d8f68SAlan Stern EXPORT_SYMBOL(usb_reset_composite_device); 3094