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> 257dfb7103SNigel Cunningham #include <linux/freezer.h> 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds #include <asm/semaphore.h> 281da177e4SLinus Torvalds #include <asm/uaccess.h> 291da177e4SLinus Torvalds #include <asm/byteorder.h> 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #include "usb.h" 321da177e4SLinus Torvalds #include "hcd.h" 331da177e4SLinus Torvalds #include "hub.h" 341da177e4SLinus Torvalds 351bb5f66bSAlan Stern struct usb_hub { 361bb5f66bSAlan Stern struct device *intfdev; /* the "interface" device */ 371bb5f66bSAlan Stern struct usb_device *hdev; 381bb5f66bSAlan Stern struct urb *urb; /* for interrupt polling pipe */ 391bb5f66bSAlan Stern 401bb5f66bSAlan Stern /* buffer for urb ... with extra space in case of babble */ 411bb5f66bSAlan Stern char (*buffer)[8]; 421bb5f66bSAlan Stern dma_addr_t buffer_dma; /* DMA address for buffer */ 431bb5f66bSAlan Stern union { 441bb5f66bSAlan Stern struct usb_hub_status hub; 451bb5f66bSAlan Stern struct usb_port_status port; 461bb5f66bSAlan Stern } *status; /* buffer for status reports */ 47db90e7a1SAlan Stern struct mutex status_mutex; /* for the status buffer */ 481bb5f66bSAlan Stern 491bb5f66bSAlan Stern int error; /* last reported error */ 501bb5f66bSAlan Stern int nerrors; /* track consecutive errors */ 511bb5f66bSAlan Stern 521bb5f66bSAlan Stern struct list_head event_list; /* hubs w/data or errs ready */ 531bb5f66bSAlan Stern unsigned long event_bits[1]; /* status change bitmask */ 541bb5f66bSAlan Stern unsigned long change_bits[1]; /* ports with logical connect 551bb5f66bSAlan Stern status change */ 561bb5f66bSAlan Stern unsigned long busy_bits[1]; /* ports being reset or 571bb5f66bSAlan Stern resumed */ 581bb5f66bSAlan Stern #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ 591bb5f66bSAlan Stern #error event_bits[] is too short! 601bb5f66bSAlan Stern #endif 611bb5f66bSAlan Stern 621bb5f66bSAlan Stern struct usb_hub_descriptor *descriptor; /* class descriptor */ 631bb5f66bSAlan Stern struct usb_tt tt; /* Transaction Translator */ 641bb5f66bSAlan Stern 651bb5f66bSAlan Stern unsigned mA_per_port; /* current for each child */ 661bb5f66bSAlan Stern 671bb5f66bSAlan Stern unsigned limited_power:1; 681bb5f66bSAlan Stern unsigned quiescing:1; 691bb5f66bSAlan Stern unsigned activating:1; 701bb5f66bSAlan Stern 711bb5f66bSAlan Stern unsigned has_indicators:1; 721bb5f66bSAlan Stern u8 indicator[USB_MAXCHILDREN]; 736d5aefb8SDavid Howells struct delayed_work leds; 741bb5f66bSAlan Stern }; 751bb5f66bSAlan Stern 761bb5f66bSAlan Stern 771da177e4SLinus Torvalds /* Protect struct usb_device->state and ->children members 789ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 791da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 801da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds /* khubd's worklist and its lock */ 831da177e4SLinus Torvalds static DEFINE_SPINLOCK(hub_event_lock); 841da177e4SLinus Torvalds static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds /* Wakes up khubd */ 871da177e4SLinus Torvalds static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); 881da177e4SLinus Torvalds 899c8d6178Sakpm@osdl.org static struct task_struct *khubd_task; 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 921da177e4SLinus Torvalds static int blinkenlights = 0; 931da177e4SLinus Torvalds module_param (blinkenlights, bool, S_IRUGO); 941da177e4SLinus Torvalds MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds /* 971da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 981da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 991da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 1001da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 1011da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 1021da177e4SLinus Torvalds * following module parameters. 1031da177e4SLinus Torvalds * 1041da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 1051da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 1061da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 1071da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 1081da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 1091da177e4SLinus Torvalds */ 1101da177e4SLinus Torvalds static int old_scheme_first = 0; 1111da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 1121da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 1131da177e4SLinus Torvalds "start with the old device initialization scheme"); 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds static int use_both_schemes = 1; 1161da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 1171da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 1181da177e4SLinus Torvalds "try the other device initialization scheme if the " 1191da177e4SLinus Torvalds "first one fails"); 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds 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 1321da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 1331da177e4SLinus Torvalds static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev) 1341da177e4SLinus Torvalds { 1351da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1361da177e4SLinus Torvalds } 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 1391da177e4SLinus Torvalds static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) 1401da177e4SLinus Torvalds { 1411da177e4SLinus Torvalds int i, ret; 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 1441da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 1451da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 1461da177e4SLinus Torvalds USB_DT_HUB << 8, 0, data, size, 1471da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 1481da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 1491da177e4SLinus Torvalds return ret; 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds return -EINVAL; 1521da177e4SLinus Torvalds } 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds /* 1551da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 1561da177e4SLinus Torvalds */ 1571da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 1581da177e4SLinus Torvalds { 1591da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1601da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 1611da177e4SLinus Torvalds } 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds /* 1641da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 1651da177e4SLinus Torvalds */ 1661da177e4SLinus Torvalds static int clear_port_feature(struct usb_device *hdev, int port1, int feature) 1671da177e4SLinus Torvalds { 1681da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1691da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 1701da177e4SLinus Torvalds NULL, 0, 1000); 1711da177e4SLinus Torvalds } 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds /* 1741da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 1751da177e4SLinus Torvalds */ 1761da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 1771da177e4SLinus Torvalds { 1781da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1791da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 1801da177e4SLinus Torvalds NULL, 0, 1000); 1811da177e4SLinus Torvalds } 1821da177e4SLinus Torvalds 1831da177e4SLinus Torvalds /* 1841da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 1851da177e4SLinus Torvalds * for info about using port indicators 1861da177e4SLinus Torvalds */ 1871da177e4SLinus Torvalds static void set_port_led( 1881da177e4SLinus Torvalds struct usb_hub *hub, 1891da177e4SLinus Torvalds int port1, 1901da177e4SLinus Torvalds int selector 1911da177e4SLinus Torvalds ) 1921da177e4SLinus Torvalds { 1931da177e4SLinus Torvalds int status = set_port_feature(hub->hdev, (selector << 8) | port1, 1941da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 1951da177e4SLinus Torvalds if (status < 0) 1961da177e4SLinus Torvalds dev_dbg (hub->intfdev, 1971da177e4SLinus Torvalds "port %d indicator %s status %d\n", 1981da177e4SLinus Torvalds port1, 1991da177e4SLinus Torvalds ({ char *s; switch (selector) { 2001da177e4SLinus Torvalds case HUB_LED_AMBER: s = "amber"; break; 2011da177e4SLinus Torvalds case HUB_LED_GREEN: s = "green"; break; 2021da177e4SLinus Torvalds case HUB_LED_OFF: s = "off"; break; 2031da177e4SLinus Torvalds case HUB_LED_AUTO: s = "auto"; break; 2041da177e4SLinus Torvalds default: s = "??"; break; 2051da177e4SLinus Torvalds }; s; }), 2061da177e4SLinus Torvalds status); 2071da177e4SLinus Torvalds } 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 2101da177e4SLinus Torvalds 211c4028958SDavid Howells static void led_work (struct work_struct *work) 2121da177e4SLinus Torvalds { 213c4028958SDavid Howells struct usb_hub *hub = 214c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 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 32140f122f3SAlan Stern /* Suppress autosuspend until khubd runs */ 32240f122f3SAlan Stern to_usb_interface(hub->intfdev)->pm_usage_cnt = 1; 32340f122f3SAlan Stern 3241da177e4SLinus Torvalds spin_lock_irqsave(&hub_event_lock, flags); 3251da177e4SLinus Torvalds if (list_empty(&hub->event_list)) { 3261da177e4SLinus Torvalds list_add_tail(&hub->event_list, &hub_event_list); 3271da177e4SLinus Torvalds wake_up(&khubd_wait); 3281da177e4SLinus Torvalds } 3291da177e4SLinus Torvalds spin_unlock_irqrestore(&hub_event_lock, flags); 3301da177e4SLinus Torvalds } 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds void usb_kick_khubd(struct usb_device *hdev) 3331da177e4SLinus Torvalds { 3341da177e4SLinus Torvalds kick_khubd(hdev_to_hub(hdev)); 3351da177e4SLinus Torvalds } 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds 3381da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 3397d12e780SDavid Howells static void hub_irq(struct urb *urb) 3401da177e4SLinus Torvalds { 341ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 3421da177e4SLinus Torvalds int status; 3431da177e4SLinus Torvalds int i; 3441da177e4SLinus Torvalds unsigned long bits; 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds switch (urb->status) { 3471da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 3481da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 3491da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 3501da177e4SLinus Torvalds return; 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds default: /* presumably an error */ 3531da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 3541da177e4SLinus Torvalds dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status); 3551da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 3561da177e4SLinus Torvalds goto resubmit; 3571da177e4SLinus Torvalds hub->error = urb->status; 3581da177e4SLinus Torvalds /* FALL THROUGH */ 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds /* let khubd handle things */ 3611da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 3621da177e4SLinus Torvalds bits = 0; 3631da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 3641da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 3651da177e4SLinus Torvalds << (i*8); 3661da177e4SLinus Torvalds hub->event_bits[0] = bits; 3671da177e4SLinus Torvalds break; 3681da177e4SLinus Torvalds } 3691da177e4SLinus Torvalds 3701da177e4SLinus Torvalds hub->nerrors = 0; 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds /* Something happened, let khubd figure it out */ 3731da177e4SLinus Torvalds kick_khubd(hub); 3741da177e4SLinus Torvalds 3751da177e4SLinus Torvalds resubmit: 3761da177e4SLinus Torvalds if (hub->quiescing) 3771da177e4SLinus Torvalds return; 3781da177e4SLinus Torvalds 3791da177e4SLinus Torvalds if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 3801da177e4SLinus Torvalds && status != -ENODEV && status != -EPERM) 3811da177e4SLinus Torvalds dev_err (hub->intfdev, "resubmit --> %d\n", status); 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds 3841da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 3851da177e4SLinus Torvalds static inline int 3861da177e4SLinus Torvalds hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) 3871da177e4SLinus Torvalds { 3881da177e4SLinus Torvalds return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3891da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 3901da177e4SLinus Torvalds tt, NULL, 0, 1000); 3911da177e4SLinus Torvalds } 3921da177e4SLinus Torvalds 3931da177e4SLinus Torvalds /* 3941da177e4SLinus Torvalds * enumeration blocks khubd for a long time. we use keventd instead, since 3951da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 3961da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 3971da177e4SLinus Torvalds * both can talk to the same hub concurrently. 3981da177e4SLinus Torvalds */ 399c4028958SDavid Howells static void hub_tt_kevent (struct work_struct *work) 4001da177e4SLinus Torvalds { 401c4028958SDavid Howells struct usb_hub *hub = 402c4028958SDavid Howells container_of(work, struct usb_hub, tt.kevent); 4031da177e4SLinus Torvalds unsigned long flags; 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 4061da177e4SLinus Torvalds while (!list_empty (&hub->tt.clear_list)) { 4071da177e4SLinus Torvalds struct list_head *temp; 4081da177e4SLinus Torvalds struct usb_tt_clear *clear; 4091da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4101da177e4SLinus Torvalds int status; 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvalds temp = hub->tt.clear_list.next; 4131da177e4SLinus Torvalds clear = list_entry (temp, struct usb_tt_clear, clear_list); 4141da177e4SLinus Torvalds list_del (&clear->clear_list); 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 4171da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 4181da177e4SLinus Torvalds status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 4191da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvalds if (status) 4221da177e4SLinus Torvalds dev_err (&hdev->dev, 4231da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 4241da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 4251da177e4SLinus Torvalds kfree(clear); 4261da177e4SLinus Torvalds } 4271da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 4281da177e4SLinus Torvalds } 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds /** 4311da177e4SLinus Torvalds * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub 4321da177e4SLinus Torvalds * @udev: the device whose split transaction failed 4331da177e4SLinus Torvalds * @pipe: identifies the endpoint of the failed transaction 4341da177e4SLinus Torvalds * 4351da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 4361da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 4371da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 4381da177e4SLinus Torvalds * interrupt context. 4391da177e4SLinus Torvalds * 4401da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 4411da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 4421da177e4SLinus Torvalds */ 4431da177e4SLinus Torvalds void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe) 4441da177e4SLinus Torvalds { 4451da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 4461da177e4SLinus Torvalds unsigned long flags; 4471da177e4SLinus Torvalds struct usb_tt_clear *clear; 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 4501da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 4511da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 4521da177e4SLinus Torvalds */ 45354e6ecb2SChristoph Lameter if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { 4541da177e4SLinus Torvalds dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 4551da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 4561da177e4SLinus Torvalds return; 4571da177e4SLinus Torvalds } 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 4601da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 4611da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 4621da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 4631da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol (pipe) 4641da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 4651da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 4661da177e4SLinus Torvalds if (usb_pipein (pipe)) 4671da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 4681da177e4SLinus Torvalds 4691da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 4701da177e4SLinus Torvalds spin_lock_irqsave (&tt->lock, flags); 4711da177e4SLinus Torvalds list_add_tail (&clear->clear_list, &tt->clear_list); 4721da177e4SLinus Torvalds schedule_work (&tt->kevent); 4731da177e4SLinus Torvalds spin_unlock_irqrestore (&tt->lock, flags); 4741da177e4SLinus Torvalds } 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds static void hub_power_on(struct usb_hub *hub) 4771da177e4SLinus Torvalds { 4781da177e4SLinus Torvalds int port1; 479b789696aSDavid Brownell unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 4804489a571SAlan Stern u16 wHubCharacteristics = 4814489a571SAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 4821da177e4SLinus Torvalds 4834489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 4844489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 4854489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 4864489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 4874489a571SAlan Stern * unless we send these messages to the hub. 4884489a571SAlan Stern */ 4894489a571SAlan Stern if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) 4901da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 4914489a571SAlan Stern else 4924489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 4934489a571SAlan Stern "non-switchable hub\n"); 4941da177e4SLinus Torvalds for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) 4954489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 4961da177e4SLinus Torvalds 497b789696aSDavid Brownell /* Wait at least 100 msec for power to become stable */ 498b789696aSDavid Brownell msleep(max(pgood_delay, (unsigned) 100)); 4991da177e4SLinus Torvalds } 5001da177e4SLinus Torvalds 50102c399eeSAlan Stern static void hub_quiesce(struct usb_hub *hub) 5021da177e4SLinus Torvalds { 503979d5199SDavid Brownell /* (nonblocking) khubd and related activity won't re-trigger */ 5041da177e4SLinus Torvalds hub->quiescing = 1; 505c9f89fa4SDavid Brownell hub->activating = 0; 506979d5199SDavid Brownell 507979d5199SDavid Brownell /* (blocking) stop khubd and related activity */ 5081da177e4SLinus Torvalds usb_kill_urb(hub->urb); 5091da177e4SLinus Torvalds if (hub->has_indicators) 5101da177e4SLinus Torvalds cancel_delayed_work(&hub->leds); 5111da177e4SLinus Torvalds if (hub->has_indicators || hub->tt.hub) 5121da177e4SLinus Torvalds flush_scheduled_work(); 5131da177e4SLinus Torvalds } 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds static void hub_activate(struct usb_hub *hub) 5161da177e4SLinus Torvalds { 5171da177e4SLinus Torvalds int status; 5181da177e4SLinus Torvalds 5191da177e4SLinus Torvalds hub->quiescing = 0; 5201da177e4SLinus Torvalds hub->activating = 1; 52140f122f3SAlan Stern 5221da177e4SLinus Torvalds status = usb_submit_urb(hub->urb, GFP_NOIO); 5231da177e4SLinus Torvalds if (status < 0) 5241da177e4SLinus Torvalds dev_err(hub->intfdev, "activate --> %d\n", status); 5251da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 5261da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds /* scan all ports ASAP */ 5291da177e4SLinus Torvalds kick_khubd(hub); 5301da177e4SLinus Torvalds } 5311da177e4SLinus Torvalds 5321da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 5331da177e4SLinus Torvalds u16 *status, u16 *change) 5341da177e4SLinus Torvalds { 5351da177e4SLinus Torvalds int ret; 5361da177e4SLinus Torvalds 537db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 5381da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 5391da177e4SLinus Torvalds if (ret < 0) 5401da177e4SLinus Torvalds dev_err (hub->intfdev, 5411da177e4SLinus Torvalds "%s failed (err = %d)\n", __FUNCTION__, ret); 5421da177e4SLinus Torvalds else { 5431da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 5441da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 5451da177e4SLinus Torvalds ret = 0; 5461da177e4SLinus Torvalds } 547db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 5481da177e4SLinus Torvalds return ret; 5491da177e4SLinus Torvalds } 5501da177e4SLinus Torvalds 5518b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 5528b28c752SAlan Stern { 5538b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 5548b28c752SAlan Stern int ret; 5558b28c752SAlan Stern 5568b28c752SAlan Stern if (hdev->children[port1-1] && set_state) { 5578b28c752SAlan Stern usb_set_device_state(hdev->children[port1-1], 5588b28c752SAlan Stern USB_STATE_NOTATTACHED); 5598b28c752SAlan Stern } 5608b28c752SAlan Stern ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); 5618b28c752SAlan Stern if (ret) 5628b28c752SAlan Stern dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 5638b28c752SAlan Stern port1, ret); 5648b28c752SAlan Stern 5658b28c752SAlan Stern return ret; 5668b28c752SAlan Stern } 5678b28c752SAlan Stern 5687d069b7dSAlan Stern 5697d069b7dSAlan Stern /* caller has locked the hub device */ 5707de18d8bSAlan Stern static void hub_pre_reset(struct usb_interface *intf) 5717d069b7dSAlan Stern { 5727de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 5737d069b7dSAlan Stern struct usb_device *hdev = hub->hdev; 5747d069b7dSAlan Stern int port1; 5757d069b7dSAlan Stern 5767d069b7dSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 5777d069b7dSAlan Stern if (hdev->children[port1 - 1]) { 5787d069b7dSAlan Stern usb_disconnect(&hdev->children[port1 - 1]); 5797de18d8bSAlan Stern if (hub->error == 0) 5807d069b7dSAlan Stern hub_port_disable(hub, port1, 0); 5817d069b7dSAlan Stern } 5827d069b7dSAlan Stern } 5837d069b7dSAlan Stern hub_quiesce(hub); 5847d069b7dSAlan Stern } 5857d069b7dSAlan Stern 5867d069b7dSAlan Stern /* caller has locked the hub device */ 5877de18d8bSAlan Stern static void hub_post_reset(struct usb_interface *intf) 5887d069b7dSAlan Stern { 5897de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 5907de18d8bSAlan Stern 5917d069b7dSAlan Stern hub_activate(hub); 5927d069b7dSAlan Stern hub_power_on(hub); 5937d069b7dSAlan Stern } 5947d069b7dSAlan Stern 5957d069b7dSAlan Stern 5961da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 5971da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 5981da177e4SLinus Torvalds { 5991da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 6001da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 6011da177e4SLinus Torvalds u16 hubstatus, hubchange; 60274ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 6031da177e4SLinus Torvalds unsigned int pipe; 6041da177e4SLinus Torvalds int maxp, ret; 6051da177e4SLinus Torvalds char *message; 6061da177e4SLinus Torvalds 6071da177e4SLinus Torvalds hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL, 6081da177e4SLinus Torvalds &hub->buffer_dma); 6091da177e4SLinus Torvalds if (!hub->buffer) { 6101da177e4SLinus Torvalds message = "can't allocate hub irq buffer"; 6111da177e4SLinus Torvalds ret = -ENOMEM; 6121da177e4SLinus Torvalds goto fail; 6131da177e4SLinus Torvalds } 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 6161da177e4SLinus Torvalds if (!hub->status) { 6171da177e4SLinus Torvalds message = "can't kmalloc hub status buffer"; 6181da177e4SLinus Torvalds ret = -ENOMEM; 6191da177e4SLinus Torvalds goto fail; 6201da177e4SLinus Torvalds } 621db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 6241da177e4SLinus Torvalds if (!hub->descriptor) { 6251da177e4SLinus Torvalds message = "can't kmalloc hub descriptor"; 6261da177e4SLinus Torvalds ret = -ENOMEM; 6271da177e4SLinus Torvalds goto fail; 6281da177e4SLinus Torvalds } 6291da177e4SLinus Torvalds 6301da177e4SLinus Torvalds /* Request the entire hub descriptor. 6311da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 6321da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 6331da177e4SLinus Torvalds */ 6341da177e4SLinus Torvalds ret = get_hub_descriptor(hdev, hub->descriptor, 6351da177e4SLinus Torvalds sizeof(*hub->descriptor)); 6361da177e4SLinus Torvalds if (ret < 0) { 6371da177e4SLinus Torvalds message = "can't read hub descriptor"; 6381da177e4SLinus Torvalds goto fail; 6391da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 6401da177e4SLinus Torvalds message = "hub has too many ports!"; 6411da177e4SLinus Torvalds ret = -ENODEV; 6421da177e4SLinus Torvalds goto fail; 6431da177e4SLinus Torvalds } 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 6461da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 6471da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 6481da177e4SLinus Torvalds 64974ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 6501da177e4SLinus Torvalds 65174ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_COMPOUND) { 6521da177e4SLinus Torvalds int i; 6531da177e4SLinus Torvalds char portstr [USB_MAXCHILDREN + 1]; 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 6561da177e4SLinus Torvalds portstr[i] = hub->descriptor->DeviceRemovable 6571da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 6581da177e4SLinus Torvalds ? 'F' : 'R'; 6591da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 6601da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 6611da177e4SLinus Torvalds } else 6621da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 6631da177e4SLinus Torvalds 66474ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 6651da177e4SLinus Torvalds case 0x00: 6661da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 6671da177e4SLinus Torvalds break; 6681da177e4SLinus Torvalds case 0x01: 6691da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 6701da177e4SLinus Torvalds break; 6711da177e4SLinus Torvalds case 0x02: 6721da177e4SLinus Torvalds case 0x03: 6731da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 6741da177e4SLinus Torvalds break; 6751da177e4SLinus Torvalds } 6761da177e4SLinus Torvalds 67774ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 6781da177e4SLinus Torvalds case 0x00: 6791da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 6801da177e4SLinus Torvalds break; 6811da177e4SLinus Torvalds case 0x08: 6821da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 6831da177e4SLinus Torvalds break; 6841da177e4SLinus Torvalds case 0x10: 6851da177e4SLinus Torvalds case 0x18: 6861da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 6871da177e4SLinus Torvalds break; 6881da177e4SLinus Torvalds } 6891da177e4SLinus Torvalds 6901da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 6911da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 692c4028958SDavid Howells INIT_WORK (&hub->tt.kevent, hub_tt_kevent); 6931da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 6941da177e4SLinus Torvalds case 0: 6951da177e4SLinus Torvalds break; 6961da177e4SLinus Torvalds case 1: 6971da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 6981da177e4SLinus Torvalds hub->tt.hub = hdev; 6991da177e4SLinus Torvalds break; 7001da177e4SLinus Torvalds case 2: 7011da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 7021da177e4SLinus Torvalds if (ret == 0) { 7031da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 7041da177e4SLinus Torvalds hub->tt.multi = 1; 7051da177e4SLinus Torvalds } else 7061da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 7071da177e4SLinus Torvalds ret); 7081da177e4SLinus Torvalds hub->tt.hub = hdev; 7091da177e4SLinus Torvalds break; 7101da177e4SLinus Torvalds default: 7111da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 7121da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 7131da177e4SLinus Torvalds break; 7141da177e4SLinus Torvalds } 7151da177e4SLinus Torvalds 716e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 71774ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 718e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 719e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 720e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 721e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 722e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 723e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 724e09711aeSdavid-b@pacbell.net } 7251da177e4SLinus Torvalds break; 726e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 727e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 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 16, hub->tt.think_time); 7311da177e4SLinus Torvalds break; 732e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 733e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 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 24, hub->tt.think_time); 7371da177e4SLinus Torvalds break; 738e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 739e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 740e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 741e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 742e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 7431da177e4SLinus Torvalds break; 7441da177e4SLinus Torvalds } 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 74774ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 7481da177e4SLinus Torvalds hub->has_indicators = 1; 7491da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 7501da177e4SLinus Torvalds } 7511da177e4SLinus Torvalds 7521da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 7531da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 7541da177e4SLinus Torvalds 7551da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 7561da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 7571da177e4SLinus Torvalds */ 7581da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 75955c52718SAlan Stern if (ret < 2) { 7601da177e4SLinus Torvalds message = "can't get hub status"; 7611da177e4SLinus Torvalds goto fail; 7621da177e4SLinus Torvalds } 7637d35b929SAlan Stern le16_to_cpus(&hubstatus); 7647d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 76555c52718SAlan Stern if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) 76655c52718SAlan Stern hub->mA_per_port = 500; 76755c52718SAlan Stern else { 76855c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 76955c52718SAlan Stern hub->limited_power = 1; 77055c52718SAlan Stern } 7717d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 7721da177e4SLinus Torvalds dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 7731da177e4SLinus Torvalds hub->descriptor->bHubContrCurrent); 77455c52718SAlan Stern hub->limited_power = 1; 77555c52718SAlan Stern if (hdev->maxchild > 0) { 77655c52718SAlan Stern int remaining = hdev->bus_mA - 77755c52718SAlan Stern hub->descriptor->bHubContrCurrent; 7781da177e4SLinus Torvalds 77955c52718SAlan Stern if (remaining < hdev->maxchild * 100) 78055c52718SAlan Stern dev_warn(hub_dev, 78155c52718SAlan Stern "insufficient power available " 78255c52718SAlan Stern "to use all downstream ports\n"); 78355c52718SAlan Stern hub->mA_per_port = 100; /* 7.2.1.1 */ 78455c52718SAlan Stern } 78555c52718SAlan Stern } else { /* Self-powered external hub */ 78655c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 78755c52718SAlan Stern * provide less current per port? */ 78855c52718SAlan Stern hub->mA_per_port = 500; 78955c52718SAlan Stern } 79055c52718SAlan Stern if (hub->mA_per_port < 500) 79155c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 79255c52718SAlan Stern hub->mA_per_port); 7931da177e4SLinus Torvalds 7941da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 7951da177e4SLinus Torvalds if (ret < 0) { 7961da177e4SLinus Torvalds message = "can't get hub status"; 7971da177e4SLinus Torvalds goto fail; 7981da177e4SLinus Torvalds } 7991da177e4SLinus Torvalds 8001da177e4SLinus Torvalds /* local power status reports aren't always correct */ 8011da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 8021da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 8031da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 8041da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 8051da177e4SLinus Torvalds 80674ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 8071da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 8081da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 8091da177e4SLinus Torvalds 81088fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 81188fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 81288fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 81388fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 81488fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 81588fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 8161da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 8171da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 8181da177e4SLinus Torvalds 8191da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 8201da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 8211da177e4SLinus Torvalds 8221da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 8231da177e4SLinus Torvalds if (!hub->urb) { 8241da177e4SLinus Torvalds message = "couldn't allocate interrupt urb"; 8251da177e4SLinus Torvalds ret = -ENOMEM; 8261da177e4SLinus Torvalds goto fail; 8271da177e4SLinus Torvalds } 8281da177e4SLinus Torvalds 8291da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 8301da177e4SLinus Torvalds hub, endpoint->bInterval); 8311da177e4SLinus Torvalds hub->urb->transfer_dma = hub->buffer_dma; 8321da177e4SLinus Torvalds hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 8331da177e4SLinus Torvalds 8341da177e4SLinus Torvalds /* maybe cycle the hub leds */ 8351da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 8361da177e4SLinus Torvalds hub->indicator [0] = INDICATOR_CYCLE; 8371da177e4SLinus Torvalds 8381da177e4SLinus Torvalds hub_power_on(hub); 8391da177e4SLinus Torvalds hub_activate(hub); 8401da177e4SLinus Torvalds return 0; 8411da177e4SLinus Torvalds 8421da177e4SLinus Torvalds fail: 8431da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 8441da177e4SLinus Torvalds message, ret); 8451da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 8461da177e4SLinus Torvalds return ret; 8471da177e4SLinus Torvalds } 8481da177e4SLinus Torvalds 8491da177e4SLinus Torvalds static unsigned highspeed_hubs; 8501da177e4SLinus Torvalds 8511da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 8521da177e4SLinus Torvalds { 8531da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 8541da177e4SLinus Torvalds struct usb_device *hdev; 8551da177e4SLinus Torvalds 8567de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 8577de18d8bSAlan Stern hub->error = 0; 8587de18d8bSAlan Stern hub_pre_reset(intf); 8597de18d8bSAlan Stern 8608b28c752SAlan Stern usb_set_intfdata (intf, NULL); 8611da177e4SLinus Torvalds hdev = hub->hdev; 8621da177e4SLinus Torvalds 8631da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 8641da177e4SLinus Torvalds highspeed_hubs--; 8651da177e4SLinus Torvalds 8661da177e4SLinus Torvalds usb_free_urb(hub->urb); 8671da177e4SLinus Torvalds hub->urb = NULL; 8681da177e4SLinus Torvalds 8691da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 8701da177e4SLinus Torvalds list_del_init(&hub->event_list); 8711da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 8721da177e4SLinus Torvalds 8731da177e4SLinus Torvalds kfree(hub->descriptor); 8741da177e4SLinus Torvalds hub->descriptor = NULL; 8751da177e4SLinus Torvalds 8761da177e4SLinus Torvalds kfree(hub->status); 8771da177e4SLinus Torvalds hub->status = NULL; 8781da177e4SLinus Torvalds 8791da177e4SLinus Torvalds if (hub->buffer) { 8801da177e4SLinus Torvalds usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer, 8811da177e4SLinus Torvalds hub->buffer_dma); 8821da177e4SLinus Torvalds hub->buffer = NULL; 8831da177e4SLinus Torvalds } 8841da177e4SLinus Torvalds 8851da177e4SLinus Torvalds kfree(hub); 8861da177e4SLinus Torvalds } 8871da177e4SLinus Torvalds 8881da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 8891da177e4SLinus Torvalds { 8901da177e4SLinus Torvalds struct usb_host_interface *desc; 8911da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 8921da177e4SLinus Torvalds struct usb_device *hdev; 8931da177e4SLinus Torvalds struct usb_hub *hub; 8941da177e4SLinus Torvalds 8951da177e4SLinus Torvalds desc = intf->cur_altsetting; 8961da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 8971da177e4SLinus Torvalds 89889ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 89989ccbdc9SDavid Brownell if (hdev->parent) { 90089ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 90189ccbdc9SDavid Brownell return -ENODEV; 90289ccbdc9SDavid Brownell } 90389ccbdc9SDavid Brownell #endif 90489ccbdc9SDavid Brownell 9051da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 9061da177e4SLinus Torvalds /* specs is not defined, but it works */ 9071da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 9081da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 9091da177e4SLinus Torvalds descriptor_error: 9101da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 9111da177e4SLinus Torvalds return -EIO; 9121da177e4SLinus Torvalds } 9131da177e4SLinus Torvalds 9141da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 9151da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 9161da177e4SLinus Torvalds goto descriptor_error; 9171da177e4SLinus Torvalds 9181da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 9191da177e4SLinus Torvalds 920fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 921fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 9221da177e4SLinus Torvalds goto descriptor_error; 9231da177e4SLinus Torvalds 9241da177e4SLinus Torvalds /* We found a hub */ 9251da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 9261da177e4SLinus Torvalds 9270a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 9281da177e4SLinus Torvalds if (!hub) { 9291da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 9301da177e4SLinus Torvalds return -ENOMEM; 9311da177e4SLinus Torvalds } 9321da177e4SLinus Torvalds 9331da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 9341da177e4SLinus Torvalds hub->intfdev = &intf->dev; 9351da177e4SLinus Torvalds hub->hdev = hdev; 936c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 9371da177e4SLinus Torvalds 9381da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 93940f122f3SAlan Stern intf->needs_remote_wakeup = 1; 9401da177e4SLinus Torvalds 9411da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 9421da177e4SLinus Torvalds highspeed_hubs++; 9431da177e4SLinus Torvalds 9441da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 9451da177e4SLinus Torvalds return 0; 9461da177e4SLinus Torvalds 9471da177e4SLinus Torvalds hub_disconnect (intf); 9481da177e4SLinus Torvalds return -ENODEV; 9491da177e4SLinus Torvalds } 9501da177e4SLinus Torvalds 9511da177e4SLinus Torvalds static int 9521da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 9531da177e4SLinus Torvalds { 9541da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 9551da177e4SLinus Torvalds 9561da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 9571da177e4SLinus Torvalds switch (code) { 9581da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 9591da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 9601da177e4SLinus Torvalds int i; 9611da177e4SLinus Torvalds 9621da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 9631da177e4SLinus Torvalds if (hdev->devnum <= 0) 9641da177e4SLinus Torvalds info->nports = 0; 9651da177e4SLinus Torvalds else { 9661da177e4SLinus Torvalds info->nports = hdev->maxchild; 9671da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 9681da177e4SLinus Torvalds if (hdev->children[i] == NULL) 9691da177e4SLinus Torvalds info->port[i] = 0; 9701da177e4SLinus Torvalds else 9711da177e4SLinus Torvalds info->port[i] = 9721da177e4SLinus Torvalds hdev->children[i]->devnum; 9731da177e4SLinus Torvalds } 9741da177e4SLinus Torvalds } 9751da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 9761da177e4SLinus Torvalds 9771da177e4SLinus Torvalds return info->nports + 1; 9781da177e4SLinus Torvalds } 9791da177e4SLinus Torvalds 9801da177e4SLinus Torvalds default: 9811da177e4SLinus Torvalds return -ENOSYS; 9821da177e4SLinus Torvalds } 9831da177e4SLinus Torvalds } 9841da177e4SLinus Torvalds 9851da177e4SLinus Torvalds 9861da177e4SLinus Torvalds /* grab device/port lock, returning index of that port (zero based). 9871da177e4SLinus Torvalds * protects the upstream link used by this device from concurrent 9881da177e4SLinus Torvalds * tree operations like suspend, resume, reset, and disconnect, which 9891da177e4SLinus Torvalds * apply to everything downstream of a given port. 9901da177e4SLinus Torvalds */ 9911da177e4SLinus Torvalds static int locktree(struct usb_device *udev) 9921da177e4SLinus Torvalds { 9931da177e4SLinus Torvalds int t; 9941da177e4SLinus Torvalds struct usb_device *hdev; 9951da177e4SLinus Torvalds 9961da177e4SLinus Torvalds if (!udev) 9971da177e4SLinus Torvalds return -ENODEV; 9981da177e4SLinus Torvalds 9991da177e4SLinus Torvalds /* root hub is always the first lock in the series */ 10001da177e4SLinus Torvalds hdev = udev->parent; 10011da177e4SLinus Torvalds if (!hdev) { 10021da177e4SLinus Torvalds usb_lock_device(udev); 10031da177e4SLinus Torvalds return 0; 10041da177e4SLinus Torvalds } 10051da177e4SLinus Torvalds 10061da177e4SLinus Torvalds /* on the path from root to us, lock everything from 10071da177e4SLinus Torvalds * top down, dropping parent locks when not needed 10081da177e4SLinus Torvalds */ 10091da177e4SLinus Torvalds t = locktree(hdev); 10101da177e4SLinus Torvalds if (t < 0) 10111da177e4SLinus Torvalds return t; 101212c3da34SAlan Stern 10131da177e4SLinus Torvalds /* everything is fail-fast once disconnect 10141da177e4SLinus Torvalds * processing starts 10151da177e4SLinus Torvalds */ 101612c3da34SAlan Stern if (udev->state == USB_STATE_NOTATTACHED) { 101712c3da34SAlan Stern usb_unlock_device(hdev); 101812c3da34SAlan Stern return -ENODEV; 101912c3da34SAlan Stern } 10201da177e4SLinus Torvalds 10211da177e4SLinus Torvalds /* when everyone grabs locks top->bottom, 10221da177e4SLinus Torvalds * non-overlapping work may be concurrent 10231da177e4SLinus Torvalds */ 10249ad3d6ccSAlan Stern usb_lock_device(udev); 10259ad3d6ccSAlan Stern usb_unlock_device(hdev); 102612c3da34SAlan Stern return udev->portnum; 10271da177e4SLinus Torvalds } 10281da177e4SLinus Torvalds 10291da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 10301da177e4SLinus Torvalds { 10311da177e4SLinus Torvalds int i; 10321da177e4SLinus Torvalds 10331da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 10341da177e4SLinus Torvalds if (udev->children[i]) 10351da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev->children[i]); 10361da177e4SLinus Torvalds } 1037ee49fb5dSAlan Stern if (udev->state == USB_STATE_SUSPENDED) 1038ee49fb5dSAlan Stern udev->discon_suspended = 1; 10391da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 10401da177e4SLinus Torvalds } 10411da177e4SLinus Torvalds 10421da177e4SLinus Torvalds /** 10431da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 10441da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 10451da177e4SLinus Torvalds * @new_state: new state value to be stored 10461da177e4SLinus Torvalds * 10471da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 10481da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 10491da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 10501da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 10511da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 10521da177e4SLinus Torvalds * all changes to any device's state must be protected by the 10531da177e4SLinus Torvalds * device_state_lock spinlock. 10541da177e4SLinus Torvalds * 10551da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 10561da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 10571da177e4SLinus Torvalds * 10581da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 10591da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 10601da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 10611da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 10621da177e4SLinus Torvalds */ 10631da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 10641da177e4SLinus Torvalds enum usb_device_state new_state) 10651da177e4SLinus Torvalds { 10661da177e4SLinus Torvalds unsigned long flags; 10671da177e4SLinus Torvalds 10681da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 10691da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 10701da177e4SLinus Torvalds ; /* do nothing */ 1071b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1072fb669cc0SDavid Brownell 1073fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1074fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1075fb669cc0SDavid Brownell */ 1076fb669cc0SDavid Brownell if (udev->parent) { 1077645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1078645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1079645daaabSAlan Stern ; /* No change to wakeup settings */ 1080645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 1081b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 1082b94dc6b5SDavid Brownell (udev->actconfig->desc.bmAttributes 1083b94dc6b5SDavid Brownell & USB_CONFIG_ATT_WAKEUP)); 1084645daaabSAlan Stern else 1085b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 0); 1086fb669cc0SDavid Brownell } 1087645daaabSAlan Stern udev->state = new_state; 1088b94dc6b5SDavid Brownell } else 10891da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 10901da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 10911da177e4SLinus Torvalds } 10921da177e4SLinus Torvalds 10931da177e4SLinus Torvalds 10941c50c317SAlan Stern #ifdef CONFIG_PM 10951c50c317SAlan Stern 10961c50c317SAlan Stern /** 10971c50c317SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 10981c50c317SAlan Stern * @rhdev: struct usb_device for the root hub 10991c50c317SAlan Stern * 11001c50c317SAlan Stern * The USB host controller driver calls this function when its root hub 11011c50c317SAlan Stern * is resumed and Vbus power has been interrupted or the controller 11021c50c317SAlan Stern * has been reset. The routine marks all the children of the root hub 11031c50c317SAlan Stern * as NOTATTACHED and marks logical connect-change events on their ports. 11041c50c317SAlan Stern */ 11051c50c317SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 11061c50c317SAlan Stern { 11071c50c317SAlan Stern struct usb_hub *hub; 11081c50c317SAlan Stern int port1; 11091c50c317SAlan Stern unsigned long flags; 11101c50c317SAlan Stern 11111c50c317SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 1112353a4098SAlan Stern 1113353a4098SAlan Stern /* Make sure no potential wakeup events get lost, 1114353a4098SAlan Stern * by forcing the root hub to be resumed. 1115353a4098SAlan Stern */ 1116353a4098SAlan Stern rhdev->dev.power.prev_state.event = PM_EVENT_ON; 1117353a4098SAlan Stern 11181c50c317SAlan Stern spin_lock_irqsave(&device_state_lock, flags); 11191c50c317SAlan Stern hub = hdev_to_hub(rhdev); 11201c50c317SAlan Stern for (port1 = 1; port1 <= rhdev->maxchild; ++port1) { 11211c50c317SAlan Stern if (rhdev->children[port1 - 1]) { 11221c50c317SAlan Stern recursively_mark_NOTATTACHED( 11231c50c317SAlan Stern rhdev->children[port1 - 1]); 11241c50c317SAlan Stern set_bit(port1, hub->change_bits); 11251c50c317SAlan Stern } 11261c50c317SAlan Stern } 11271c50c317SAlan Stern spin_unlock_irqrestore(&device_state_lock, flags); 11281c50c317SAlan Stern } 11291c50c317SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 11301c50c317SAlan Stern 1131d388dab7SAlan Stern #endif /* CONFIG_PM */ 11321c50c317SAlan Stern 11331da177e4SLinus Torvalds static void choose_address(struct usb_device *udev) 11341da177e4SLinus Torvalds { 11351da177e4SLinus Torvalds int devnum; 11361da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 11371da177e4SLinus Torvalds 11381da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 11391da177e4SLinus Torvalds 11401da177e4SLinus Torvalds /* Try to allocate the next devnum beginning at bus->devnum_next. */ 11411da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 11421da177e4SLinus Torvalds bus->devnum_next); 11431da177e4SLinus Torvalds if (devnum >= 128) 11441da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1); 11451da177e4SLinus Torvalds 11461da177e4SLinus Torvalds bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); 11471da177e4SLinus Torvalds 11481da177e4SLinus Torvalds if (devnum < 128) { 11491da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 11501da177e4SLinus Torvalds udev->devnum = devnum; 11511da177e4SLinus Torvalds } 11521da177e4SLinus Torvalds } 11531da177e4SLinus Torvalds 11541da177e4SLinus Torvalds static void release_address(struct usb_device *udev) 11551da177e4SLinus Torvalds { 11561da177e4SLinus Torvalds if (udev->devnum > 0) { 11571da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 11581da177e4SLinus Torvalds udev->devnum = -1; 11591da177e4SLinus Torvalds } 11601da177e4SLinus Torvalds } 11611da177e4SLinus Torvalds 11621da177e4SLinus Torvalds /** 11631da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 11641da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 11651da177e4SLinus Torvalds * Context: !in_interrupt () 11661da177e4SLinus Torvalds * 11671da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 11681da177e4SLinus Torvalds * 11691da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 11701da177e4SLinus Torvalds * If *pdev is a root hub then this routine will acquire the 11711da177e4SLinus Torvalds * usb_bus_list_lock on behalf of the caller. 11721da177e4SLinus Torvalds * 11731da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 11741da177e4SLinus Torvalds * controllers) should ever call this. 11751da177e4SLinus Torvalds * 11761da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 11771da177e4SLinus Torvalds */ 11781da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 11791da177e4SLinus Torvalds { 11801da177e4SLinus Torvalds struct usb_device *udev = *pdev; 11811da177e4SLinus Torvalds int i; 11821da177e4SLinus Torvalds 11831da177e4SLinus Torvalds if (!udev) { 11841da177e4SLinus Torvalds pr_debug ("%s nodev\n", __FUNCTION__); 11851da177e4SLinus Torvalds return; 11861da177e4SLinus Torvalds } 11871da177e4SLinus Torvalds 11881da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 11891da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 11901da177e4SLinus Torvalds * this quiesces everyting except pending urbs. 11911da177e4SLinus Torvalds */ 11921da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 11931da177e4SLinus Torvalds dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); 11941da177e4SLinus Torvalds 11959ad3d6ccSAlan Stern usb_lock_device(udev); 11969ad3d6ccSAlan Stern 11971da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 11981da177e4SLinus Torvalds for (i = 0; i < USB_MAXCHILDREN; i++) { 11991da177e4SLinus Torvalds if (udev->children[i]) 12001da177e4SLinus Torvalds usb_disconnect(&udev->children[i]); 12011da177e4SLinus Torvalds } 12021da177e4SLinus Torvalds 12031da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 12041da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 12051da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 12061da177e4SLinus Torvalds */ 1207782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 12081da177e4SLinus Torvalds usb_disable_device(udev, 0); 12091da177e4SLinus Torvalds 1210782da727SAlan Stern usb_unlock_device(udev); 12113099e75aSGreg Kroah-Hartman 1212782da727SAlan Stern /* Unregister the device. The device driver is responsible 1213782da727SAlan Stern * for removing the device files from usbfs and sysfs and for 1214782da727SAlan Stern * de-configuring the device. 1215782da727SAlan Stern */ 1216782da727SAlan Stern device_del(&udev->dev); 1217782da727SAlan Stern 1218782da727SAlan Stern /* Free the device number and delete the parent's children[] 12191da177e4SLinus Torvalds * (or root_hub) pointer. 12201da177e4SLinus Torvalds */ 12211da177e4SLinus Torvalds release_address(udev); 12221da177e4SLinus Torvalds 12231da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 12241da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 12251da177e4SLinus Torvalds *pdev = NULL; 12261da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 12271da177e4SLinus Torvalds 1228ee49fb5dSAlan Stern /* Decrement the parent's count of unsuspended children */ 1229ee49fb5dSAlan Stern if (udev->parent) { 1230ee49fb5dSAlan Stern usb_pm_lock(udev); 1231ee49fb5dSAlan Stern if (!udev->discon_suspended) 123294fcda1fSAlan Stern usb_autosuspend_device(udev->parent); 1233ee49fb5dSAlan Stern usb_pm_unlock(udev); 1234ee49fb5dSAlan Stern } 1235ee49fb5dSAlan Stern 1236782da727SAlan Stern put_device(&udev->dev); 12371da177e4SLinus Torvalds } 12381da177e4SLinus Torvalds 12391da177e4SLinus Torvalds #ifdef DEBUG 12401da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 12411da177e4SLinus Torvalds { 12421da177e4SLinus Torvalds if (!string) 12431da177e4SLinus Torvalds return; 12441da177e4SLinus Torvalds dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); 12451da177e4SLinus Torvalds } 12461da177e4SLinus Torvalds 12471da177e4SLinus Torvalds #else 12481da177e4SLinus Torvalds static inline void show_string(struct usb_device *udev, char *id, char *string) 12491da177e4SLinus Torvalds {} 12501da177e4SLinus Torvalds #endif 12511da177e4SLinus Torvalds 12521da177e4SLinus Torvalds 12531da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 12541da177e4SLinus Torvalds #include "otg_whitelist.h" 125511bd44abSDavid Brownell static int __usb_port_suspend(struct usb_device *, int port1); 12561da177e4SLinus Torvalds #endif 12571da177e4SLinus Torvalds 12583ede760fSOliver Neukum /** 12593ede760fSOliver Neukum * usb_new_device - perform initial device setup (usbcore-internal) 12603ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 12613ede760fSOliver Neukum * 12623ede760fSOliver Neukum * This is called with devices which have been enumerated, but not yet 12633ede760fSOliver Neukum * configured. The device descriptor is available, but not descriptors 12643ede760fSOliver Neukum * for any device configuration. The caller must have locked either 12653ede760fSOliver Neukum * the parent hub (if udev is a normal device) or else the 12663ede760fSOliver Neukum * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 12673ede760fSOliver Neukum * udev has already been installed, but udev is not yet visible through 12683ede760fSOliver Neukum * sysfs or other filesystem code. 12693ede760fSOliver Neukum * 12703ede760fSOliver Neukum * It will return if the device is configured properly or not. Zero if 12713ede760fSOliver Neukum * the interface was registered with the driver core; else a negative 12723ede760fSOliver Neukum * errno value. 12733ede760fSOliver Neukum * 12743ede760fSOliver Neukum * This call is synchronous, and may not be used in an interrupt context. 12753ede760fSOliver Neukum * 12763ede760fSOliver Neukum * Only the hub driver or root-hub registrar should ever call this. 12773ede760fSOliver Neukum */ 12783ede760fSOliver Neukum int usb_new_device(struct usb_device *udev) 12791da177e4SLinus Torvalds { 12801da177e4SLinus Torvalds int err; 12811da177e4SLinus Torvalds 12827ceec1f1SOliver Neukum /* Determine quirks */ 12837ceec1f1SOliver Neukum usb_detect_quirks(udev); 12847ceec1f1SOliver Neukum 12851da177e4SLinus Torvalds err = usb_get_configuration(udev); 12861da177e4SLinus Torvalds if (err < 0) { 12871da177e4SLinus Torvalds dev_err(&udev->dev, "can't read configurations, error %d\n", 12881da177e4SLinus Torvalds err); 12891da177e4SLinus Torvalds goto fail; 12901da177e4SLinus Torvalds } 12911da177e4SLinus Torvalds 12921da177e4SLinus Torvalds /* read the standard strings and cache them if present */ 12934f62efe6SAlan Stern udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 12944f62efe6SAlan Stern udev->manufacturer = usb_cache_string(udev, 12954f62efe6SAlan Stern udev->descriptor.iManufacturer); 12964f62efe6SAlan Stern udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 12971da177e4SLinus Torvalds 12981da177e4SLinus Torvalds /* Tell the world! */ 12991da177e4SLinus Torvalds dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, " 13001da177e4SLinus Torvalds "SerialNumber=%d\n", 13011da177e4SLinus Torvalds udev->descriptor.iManufacturer, 13021da177e4SLinus Torvalds udev->descriptor.iProduct, 13031da177e4SLinus Torvalds udev->descriptor.iSerialNumber); 13041da177e4SLinus Torvalds show_string(udev, "Product", udev->product); 13051da177e4SLinus Torvalds show_string(udev, "Manufacturer", udev->manufacturer); 13061da177e4SLinus Torvalds show_string(udev, "SerialNumber", udev->serial); 13071da177e4SLinus Torvalds 13081da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 13091da177e4SLinus Torvalds /* 13101da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 13111da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 13121da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 13131da177e4SLinus Torvalds */ 13141da177e4SLinus Torvalds if (!udev->bus->is_b_host 13151da177e4SLinus Torvalds && udev->config 13161da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 13171da177e4SLinus Torvalds struct usb_otg_descriptor *desc = 0; 13181da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 13191da177e4SLinus Torvalds 13201da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 13211da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 13221da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 13231da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 13241da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 132512c3da34SAlan Stern unsigned port1 = udev->portnum; 13261da177e4SLinus Torvalds 13271da177e4SLinus Torvalds dev_info(&udev->dev, 13281da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 13291da177e4SLinus Torvalds (port1 == bus->otg_port) 13301da177e4SLinus Torvalds ? "" : "non-"); 13311da177e4SLinus Torvalds 13321da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 13331da177e4SLinus Torvalds if (port1 == bus->otg_port) 13341da177e4SLinus Torvalds bus->b_hnp_enable = 1; 13351da177e4SLinus Torvalds err = usb_control_msg(udev, 13361da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 13371da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 13381da177e4SLinus Torvalds bus->b_hnp_enable 13391da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 13401da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 13411da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 13421da177e4SLinus Torvalds if (err < 0) { 13431da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 13441da177e4SLinus Torvalds * customize to match your product. 13451da177e4SLinus Torvalds */ 13461da177e4SLinus Torvalds dev_info(&udev->dev, 13471da177e4SLinus Torvalds "can't set HNP mode; %d\n", 13481da177e4SLinus Torvalds err); 13491da177e4SLinus Torvalds bus->b_hnp_enable = 0; 13501da177e4SLinus Torvalds } 13511da177e4SLinus Torvalds } 13521da177e4SLinus Torvalds } 13531da177e4SLinus Torvalds } 13541da177e4SLinus Torvalds 13551da177e4SLinus Torvalds if (!is_targeted(udev)) { 13561da177e4SLinus Torvalds 13571da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 13581da177e4SLinus Torvalds * (Includes HNP test device.) 13591da177e4SLinus Torvalds */ 13601da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 1361140d8f68SAlan Stern err = __usb_port_suspend(udev, udev->bus->otg_port); 13621da177e4SLinus Torvalds if (err < 0) 13631da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 13641da177e4SLinus Torvalds } 13651da177e4SLinus Torvalds err = -ENODEV; 13661da177e4SLinus Torvalds goto fail; 13671da177e4SLinus Torvalds } 13681da177e4SLinus Torvalds #endif 13691da177e4SLinus Torvalds 13709f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 13719f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 13729f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 13739f8b17e6SKay Sievers 1374782da727SAlan Stern /* Register the device. The device driver is responsible 13759f8b17e6SKay Sievers * for adding the device files to sysfs and for configuring 13769f8b17e6SKay Sievers * the device. 1377782da727SAlan Stern */ 13781da177e4SLinus Torvalds err = device_add(&udev->dev); 13791da177e4SLinus Torvalds if (err) { 13801da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 13811da177e4SLinus Torvalds goto fail; 13821da177e4SLinus Torvalds } 13839ad3d6ccSAlan Stern 1384ee49fb5dSAlan Stern /* Increment the parent's count of unsuspended children */ 1385ee49fb5dSAlan Stern if (udev->parent) 138694fcda1fSAlan Stern usb_autoresume_device(udev->parent); 1387ee49fb5dSAlan Stern 1388c066475eSGreg Kroah-Hartman exit: 1389c066475eSGreg Kroah-Hartman return err; 13901da177e4SLinus Torvalds 13911da177e4SLinus Torvalds fail: 13921da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 1393c066475eSGreg Kroah-Hartman goto exit; 13941da177e4SLinus Torvalds } 13951da177e4SLinus Torvalds 13961da177e4SLinus Torvalds static int hub_port_status(struct usb_hub *hub, int port1, 13971da177e4SLinus Torvalds u16 *status, u16 *change) 13981da177e4SLinus Torvalds { 13991da177e4SLinus Torvalds int ret; 14001da177e4SLinus Torvalds 1401db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 14021da177e4SLinus Torvalds ret = get_port_status(hub->hdev, port1, &hub->status->port); 1403d25450c6SAlan Stern if (ret < 4) { 14041da177e4SLinus Torvalds dev_err (hub->intfdev, 14051da177e4SLinus Torvalds "%s failed (err = %d)\n", __FUNCTION__, ret); 1406d25450c6SAlan Stern if (ret >= 0) 1407d25450c6SAlan Stern ret = -EIO; 1408d25450c6SAlan Stern } else { 14091da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->port.wPortStatus); 14101da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->port.wPortChange); 14111da177e4SLinus Torvalds ret = 0; 14121da177e4SLinus Torvalds } 1413db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 14141da177e4SLinus Torvalds return ret; 14151da177e4SLinus Torvalds } 14161da177e4SLinus Torvalds 14170165de09SInaky Perez-Gonzalez 14180165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 14190165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 14200165de09SInaky Perez-Gonzalez { 14210165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 14220165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 14230165de09SInaky Perez-Gonzalez return 0; 14240165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 14250165de09SInaky Perez-Gonzalez return hcd->wireless; 14260165de09SInaky Perez-Gonzalez } 14270165de09SInaky Perez-Gonzalez 14280165de09SInaky Perez-Gonzalez 14291da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 14301da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 14311da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 14321da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 14331da177e4SLinus Torvalds #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) 14341da177e4SLinus Torvalds 14351da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 14361da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 14371da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 14381da177e4SLinus Torvalds #define HUB_RESET_TIMEOUT 500 14391da177e4SLinus Torvalds 14401da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 14411da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 14421da177e4SLinus Torvalds { 14431da177e4SLinus Torvalds int delay_time, ret; 14441da177e4SLinus Torvalds u16 portstatus; 14451da177e4SLinus Torvalds u16 portchange; 14461da177e4SLinus Torvalds 14471da177e4SLinus Torvalds for (delay_time = 0; 14481da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 14491da177e4SLinus Torvalds delay_time += delay) { 14501da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 14511da177e4SLinus Torvalds msleep(delay); 14521da177e4SLinus Torvalds 14531da177e4SLinus Torvalds /* read and decode port status */ 14541da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 14551da177e4SLinus Torvalds if (ret < 0) 14561da177e4SLinus Torvalds return ret; 14571da177e4SLinus Torvalds 14581da177e4SLinus Torvalds /* Device went away? */ 14591da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 14601da177e4SLinus Torvalds return -ENOTCONN; 14611da177e4SLinus Torvalds 14621da177e4SLinus Torvalds /* bomb out completely if something weird happened */ 14631da177e4SLinus Torvalds if ((portchange & USB_PORT_STAT_C_CONNECTION)) 14641da177e4SLinus Torvalds return -EINVAL; 14651da177e4SLinus Torvalds 14661da177e4SLinus Torvalds /* if we`ve finished resetting, then break out of the loop */ 14671da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_RESET) && 14681da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_ENABLE)) { 14690165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 14700165de09SInaky Perez-Gonzalez udev->speed = USB_SPEED_VARIABLE; 14710165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 14721da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 14731da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 14741da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 14751da177e4SLinus Torvalds else 14761da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 14771da177e4SLinus Torvalds return 0; 14781da177e4SLinus Torvalds } 14791da177e4SLinus Torvalds 14801da177e4SLinus Torvalds /* switch to the long delay after two short delay failures */ 14811da177e4SLinus Torvalds if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 14821da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 14831da177e4SLinus Torvalds 14841da177e4SLinus Torvalds dev_dbg (hub->intfdev, 14851da177e4SLinus Torvalds "port %d not reset yet, waiting %dms\n", 14861da177e4SLinus Torvalds port1, delay); 14871da177e4SLinus Torvalds } 14881da177e4SLinus Torvalds 14891da177e4SLinus Torvalds return -EBUSY; 14901da177e4SLinus Torvalds } 14911da177e4SLinus Torvalds 14921da177e4SLinus Torvalds static int hub_port_reset(struct usb_hub *hub, int port1, 14931da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 14941da177e4SLinus Torvalds { 14951da177e4SLinus Torvalds int i, status; 14961da177e4SLinus Torvalds 14971da177e4SLinus Torvalds /* Reset the port */ 14981da177e4SLinus Torvalds for (i = 0; i < PORT_RESET_TRIES; i++) { 14991da177e4SLinus Torvalds status = set_port_feature(hub->hdev, 15001da177e4SLinus Torvalds port1, USB_PORT_FEAT_RESET); 15011da177e4SLinus Torvalds if (status) 15021da177e4SLinus Torvalds dev_err(hub->intfdev, 15031da177e4SLinus Torvalds "cannot reset port %d (err = %d)\n", 15041da177e4SLinus Torvalds port1, status); 15051da177e4SLinus Torvalds else { 15061da177e4SLinus Torvalds status = hub_port_wait_reset(hub, port1, udev, delay); 1507dd16525bSDavid Brownell if (status && status != -ENOTCONN) 15081da177e4SLinus Torvalds dev_dbg(hub->intfdev, 15091da177e4SLinus Torvalds "port_wait_reset: err = %d\n", 15101da177e4SLinus Torvalds status); 15111da177e4SLinus Torvalds } 15121da177e4SLinus Torvalds 15131da177e4SLinus Torvalds /* return on disconnect or reset */ 15141da177e4SLinus Torvalds switch (status) { 15151da177e4SLinus Torvalds case 0: 1516b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 1517b789696aSDavid Brownell msleep(10 + 40); 15181da177e4SLinus Torvalds /* FALL THROUGH */ 15191da177e4SLinus Torvalds case -ENOTCONN: 15201da177e4SLinus Torvalds case -ENODEV: 15211da177e4SLinus Torvalds clear_port_feature(hub->hdev, 15221da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 15231da177e4SLinus Torvalds /* FIXME need disconnect() for NOTATTACHED device */ 15241da177e4SLinus Torvalds usb_set_device_state(udev, status 15251da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 15261da177e4SLinus Torvalds : USB_STATE_DEFAULT); 15271da177e4SLinus Torvalds return status; 15281da177e4SLinus Torvalds } 15291da177e4SLinus Torvalds 15301da177e4SLinus Torvalds dev_dbg (hub->intfdev, 15311da177e4SLinus Torvalds "port %d not enabled, trying reset again...\n", 15321da177e4SLinus Torvalds port1); 15331da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 15341da177e4SLinus Torvalds } 15351da177e4SLinus Torvalds 15361da177e4SLinus Torvalds dev_err (hub->intfdev, 15371da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 15381da177e4SLinus Torvalds port1); 15391da177e4SLinus Torvalds 15401da177e4SLinus Torvalds return status; 15411da177e4SLinus Torvalds } 15421da177e4SLinus Torvalds 15431da177e4SLinus Torvalds /* 15441da177e4SLinus Torvalds * Disable a port and mark a logical connnect-change event, so that some 15451da177e4SLinus Torvalds * time later khubd will disconnect() any existing usb_device on the port 15461da177e4SLinus Torvalds * and will re-enumerate if there actually is a device attached. 15471da177e4SLinus Torvalds */ 15481da177e4SLinus Torvalds static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 15491da177e4SLinus Torvalds { 15501da177e4SLinus Torvalds dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 15511da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 15521da177e4SLinus Torvalds 15531da177e4SLinus Torvalds /* FIXME let caller ask to power down the port: 15541da177e4SLinus Torvalds * - some devices won't enumerate without a VBUS power cycle 15551da177e4SLinus Torvalds * - SRP saves power that way 1556390a8c34SDavid Brownell * - ... new call, TBD ... 15571da177e4SLinus Torvalds * That's easy if this hub can switch power per-port, and 15581da177e4SLinus Torvalds * khubd reactivates the port later (timer, SRP, etc). 15591da177e4SLinus Torvalds * Powerdown must be optional, because of reset/DFU. 15601da177e4SLinus Torvalds */ 15611da177e4SLinus Torvalds 15621da177e4SLinus Torvalds set_bit(port1, hub->change_bits); 15631da177e4SLinus Torvalds kick_khubd(hub); 15641da177e4SLinus Torvalds } 15651da177e4SLinus Torvalds 1566d388dab7SAlan Stern #ifdef CONFIG_PM 15671da177e4SLinus Torvalds 15681da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 15691da177e4SLinus Torvalds 15701da177e4SLinus Torvalds /* 15711da177e4SLinus Torvalds * Selective port suspend reduces power; most suspended devices draw 15721da177e4SLinus Torvalds * less than 500 uA. It's also used in OTG, along with remote wakeup. 15731da177e4SLinus Torvalds * All devices below the suspended port are also suspended. 15741da177e4SLinus Torvalds * 15751da177e4SLinus Torvalds * Devices leave suspend state when the host wakes them up. Some devices 15761da177e4SLinus Torvalds * also support "remote wakeup", where the device can activate the USB 15771da177e4SLinus Torvalds * tree above them to deliver data, such as a keypress or packet. In 15781da177e4SLinus Torvalds * some cases, this wakes the USB host. 15791da177e4SLinus Torvalds */ 15801da177e4SLinus Torvalds static int hub_port_suspend(struct usb_hub *hub, int port1, 15811da177e4SLinus Torvalds struct usb_device *udev) 15821da177e4SLinus Torvalds { 15831da177e4SLinus Torvalds int status; 15841da177e4SLinus Torvalds 15851da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "suspend port %d\n", port1); 15861da177e4SLinus Torvalds 15871da177e4SLinus Torvalds /* enable remote wakeup when appropriate; this lets the device 15881da177e4SLinus Torvalds * wake up the upstream hub (including maybe the root hub). 15891da177e4SLinus Torvalds * 15901da177e4SLinus Torvalds * NOTE: OTG devices may issue remote wakeup (or SRP) even when 15911da177e4SLinus Torvalds * we don't explicitly enable it here. 15921da177e4SLinus Torvalds */ 1593645daaabSAlan Stern if (udev->do_remote_wakeup) { 15941da177e4SLinus Torvalds status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 15951da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 15961da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 15971da177e4SLinus Torvalds NULL, 0, 15981da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 15991da177e4SLinus Torvalds if (status) 16001da177e4SLinus Torvalds dev_dbg(&udev->dev, 16011da177e4SLinus Torvalds "won't remote wakeup, status %d\n", 16021da177e4SLinus Torvalds status); 16031da177e4SLinus Torvalds } 16041da177e4SLinus Torvalds 16051da177e4SLinus Torvalds /* see 7.1.7.6 */ 16061da177e4SLinus Torvalds status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); 16071da177e4SLinus Torvalds if (status) { 16081da177e4SLinus Torvalds dev_dbg(hub->intfdev, 16091da177e4SLinus Torvalds "can't suspend port %d, status %d\n", 16101da177e4SLinus Torvalds port1, status); 16111da177e4SLinus Torvalds /* paranoia: "should not happen" */ 16121da177e4SLinus Torvalds (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 16131da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 16141da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 16151da177e4SLinus Torvalds NULL, 0, 16161da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 16171da177e4SLinus Torvalds } else { 16181da177e4SLinus Torvalds /* device has up to 10 msec to fully suspend */ 1619645daaabSAlan Stern dev_dbg(&udev->dev, "usb %ssuspend\n", 1620645daaabSAlan Stern udev->auto_pm ? "auto-" : ""); 16211da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_SUSPENDED); 16221da177e4SLinus Torvalds msleep(10); 16231da177e4SLinus Torvalds } 16241da177e4SLinus Torvalds return status; 16251da177e4SLinus Torvalds } 16261da177e4SLinus Torvalds 16271da177e4SLinus Torvalds /* 16281da177e4SLinus Torvalds * Devices on USB hub ports have only one "suspend" state, corresponding 1629ba9d35fbSPavel Machek * to ACPI D2, "may cause the device to lose some context". 16301da177e4SLinus Torvalds * State transitions include: 16311da177e4SLinus Torvalds * 16321da177e4SLinus Torvalds * - suspend, resume ... when the VBUS power link stays live 16331da177e4SLinus Torvalds * - suspend, disconnect ... VBUS lost 16341da177e4SLinus Torvalds * 16351da177e4SLinus Torvalds * Once VBUS drop breaks the circuit, the port it's using has to go through 16361da177e4SLinus Torvalds * normal re-enumeration procedures, starting with enabling VBUS power. 16371da177e4SLinus Torvalds * Other than re-initializing the hub (plug/unplug, except for root hubs), 16381da177e4SLinus Torvalds * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 16391da177e4SLinus Torvalds * timer, no SRP, no requests through sysfs. 1640390a8c34SDavid Brownell * 1641390a8c34SDavid Brownell * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when 1642390a8c34SDavid Brownell * the root hub for their bus goes into global suspend ... so we don't 1643390a8c34SDavid Brownell * (falsely) update the device power state to say it suspended. 16441da177e4SLinus Torvalds */ 1645140d8f68SAlan Stern static int __usb_port_suspend (struct usb_device *udev, int port1) 16461da177e4SLinus Torvalds { 1647f3f3253dSDavid Brownell int status = 0; 16481da177e4SLinus Torvalds 16491da177e4SLinus Torvalds /* caller owns the udev device lock */ 16501da177e4SLinus Torvalds if (port1 < 0) 16511da177e4SLinus Torvalds return port1; 16521da177e4SLinus Torvalds 1653140d8f68SAlan Stern /* we change the device's upstream USB link, 1654140d8f68SAlan Stern * but root hubs have no upstream USB link. 16551da177e4SLinus Torvalds */ 1656f3f3253dSDavid Brownell if (udev->parent) 16571da177e4SLinus Torvalds status = hub_port_suspend(hdev_to_hub(udev->parent), port1, 16581da177e4SLinus Torvalds udev); 16592bf4086dSAlan Stern else { 1660645daaabSAlan Stern dev_dbg(&udev->dev, "usb %ssuspend\n", 1661645daaabSAlan Stern udev->auto_pm ? "auto-" : ""); 16622bf4086dSAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 16632bf4086dSAlan Stern } 16641da177e4SLinus Torvalds return status; 16651da177e4SLinus Torvalds } 16661da177e4SLinus Torvalds 16675edbfb7cSDavid Brownell /* 1668140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 16691da177e4SLinus Torvalds * @udev: device that's no longer in active use 16705edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 16711da177e4SLinus Torvalds * 16721da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 16731da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 16741da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 1675140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 16761da177e4SLinus Torvalds * to disconnect devices while they are suspended. 16771da177e4SLinus Torvalds * 1678390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 1679390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 1680390a8c34SDavid Brownell * 16811da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 16821da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 16831da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 16841da177e4SLinus Torvalds * 16851da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 16861da177e4SLinus Torvalds */ 1687140d8f68SAlan Stern int usb_port_suspend(struct usb_device *udev) 16881da177e4SLinus Torvalds { 1689140d8f68SAlan Stern return __usb_port_suspend(udev, udev->portnum); 16901da177e4SLinus Torvalds } 1691f3f3253dSDavid Brownell 16921da177e4SLinus Torvalds /* 1693390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 1694390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 1695390a8c34SDavid Brownell * special" resume" signaling. These routines kick in shortly after 16961da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 16971da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 16981da177e4SLinus Torvalds * in the tree that's rooted at this device. 16991da177e4SLinus Torvalds */ 1700140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 17011da177e4SLinus Torvalds { 17021da177e4SLinus Torvalds int status; 17031da177e4SLinus Torvalds u16 devstatus; 17041da177e4SLinus Torvalds 17051da177e4SLinus Torvalds /* caller owns the udev device lock */ 1706f3f3253dSDavid Brownell dev_dbg(&udev->dev, "finish resume\n"); 17071da177e4SLinus Torvalds 17081da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 17091da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 17101da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 17111da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 17121da177e4SLinus Torvalds */ 17131da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 17141da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 17151da177e4SLinus Torvalds : USB_STATE_ADDRESS); 17161da177e4SLinus Torvalds 17171da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 17181da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 17191da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 17201da177e4SLinus Torvalds */ 17211da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 1722b40b7a90SAlan Stern if (status >= 0) 1723b40b7a90SAlan Stern status = (status == 2 ? 0 : -ENODEV); 1724b40b7a90SAlan Stern 1725b40b7a90SAlan Stern if (status) 17261da177e4SLinus Torvalds dev_dbg(&udev->dev, 17271da177e4SLinus Torvalds "gone after usb resume? status %d\n", 17281da177e4SLinus Torvalds status); 17291da177e4SLinus Torvalds else if (udev->actconfig) { 17301da177e4SLinus Torvalds le16_to_cpus(&devstatus); 173155c52718SAlan Stern if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) 1732f3f3253dSDavid Brownell && udev->parent) { 17331da177e4SLinus Torvalds status = usb_control_msg(udev, 17341da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 17351da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, 17361da177e4SLinus Torvalds USB_RECIP_DEVICE, 17371da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 17381da177e4SLinus Torvalds NULL, 0, 17391da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 1740a8e7c565SAlan Stern if (status) 17411da177e4SLinus Torvalds dev_dbg(&udev->dev, "disable remote " 17421da177e4SLinus Torvalds "wakeup, status %d\n", status); 17434bf0ba86SAlan Stern } 17441da177e4SLinus Torvalds status = 0; 17451da177e4SLinus Torvalds 17461da177e4SLinus Torvalds } else if (udev->devnum <= 0) { 17471da177e4SLinus Torvalds dev_dbg(&udev->dev, "bogus resume!\n"); 17481da177e4SLinus Torvalds status = -EINVAL; 17491da177e4SLinus Torvalds } 17501da177e4SLinus Torvalds return status; 17511da177e4SLinus Torvalds } 17521da177e4SLinus Torvalds 17531da177e4SLinus Torvalds static int 17541da177e4SLinus Torvalds hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev) 17551da177e4SLinus Torvalds { 17561da177e4SLinus Torvalds int status; 1757d25450c6SAlan Stern u16 portchange, portstatus; 1758d25450c6SAlan Stern 1759d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 1760d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 1761d25450c6SAlan Stern if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND)) 1762d25450c6SAlan Stern goto SuspendCleared; 17631da177e4SLinus Torvalds 17641da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "resume port %d\n", port1); 17651da177e4SLinus Torvalds 1766d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 1767d5cbad4bSAlan Stern 17681da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 17691da177e4SLinus Torvalds status = clear_port_feature(hub->hdev, 17701da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 17711da177e4SLinus Torvalds if (status) { 17721da177e4SLinus Torvalds dev_dbg(hub->intfdev, 17731da177e4SLinus Torvalds "can't resume port %d, status %d\n", 17741da177e4SLinus Torvalds port1, status); 17751da177e4SLinus Torvalds } else { 17761da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 17771da177e4SLinus Torvalds if (udev) 1778645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 1779645daaabSAlan Stern udev->auto_pm ? "auto-" : ""); 17801da177e4SLinus Torvalds msleep(25); 17811da177e4SLinus Torvalds 17821da177e4SLinus Torvalds #define LIVE_FLAGS ( USB_PORT_STAT_POWER \ 17831da177e4SLinus Torvalds | USB_PORT_STAT_ENABLE \ 17841da177e4SLinus Torvalds | USB_PORT_STAT_CONNECTION) 17851da177e4SLinus Torvalds 17861da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 17871da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 17881da177e4SLinus Torvalds * sequence. 17891da177e4SLinus Torvalds */ 1790d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 1791d25450c6SAlan Stern SuspendCleared: 17921da177e4SLinus Torvalds if (status < 0 1793d25450c6SAlan Stern || (portstatus & LIVE_FLAGS) != LIVE_FLAGS 1794d25450c6SAlan Stern || (portstatus & USB_PORT_STAT_SUSPEND) != 0 17951da177e4SLinus Torvalds ) { 17961da177e4SLinus Torvalds dev_dbg(hub->intfdev, 17971da177e4SLinus Torvalds "port %d status %04x.%04x after resume, %d\n", 1798d25450c6SAlan Stern port1, portchange, portstatus, status); 179920307949SAlan Stern if (status >= 0) 180020307949SAlan Stern status = -ENODEV; 18011da177e4SLinus Torvalds } else { 180220307949SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 180320307949SAlan Stern clear_port_feature(hub->hdev, port1, 180420307949SAlan Stern USB_PORT_FEAT_C_SUSPEND); 18051da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 18061da177e4SLinus Torvalds msleep(10); 18071da177e4SLinus Torvalds if (udev) 1808140d8f68SAlan Stern status = finish_port_resume(udev); 18091da177e4SLinus Torvalds } 18101da177e4SLinus Torvalds } 18111da177e4SLinus Torvalds if (status < 0) 18121da177e4SLinus Torvalds hub_port_logical_disconnect(hub, port1); 18131da177e4SLinus Torvalds 1814d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 1815d5cbad4bSAlan Stern if (!hub->hdev->parent && !hub->busy_bits[0]) 1816d5cbad4bSAlan Stern usb_enable_root_hub_irq(hub->hdev->bus); 1817d5cbad4bSAlan Stern 18181da177e4SLinus Torvalds return status; 18191da177e4SLinus Torvalds } 18201da177e4SLinus Torvalds 18215edbfb7cSDavid Brownell /* 1822140d8f68SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 18231da177e4SLinus Torvalds * @udev: device to re-activate 18245edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 18251da177e4SLinus Torvalds * 18261da177e4SLinus Torvalds * This will re-activate the suspended device, increasing power usage 18271da177e4SLinus Torvalds * while letting drivers communicate again with its endpoints. 18281da177e4SLinus Torvalds * USB resume explicitly guarantees that the power session between 18291da177e4SLinus Torvalds * the host and the device is the same as it was when the device 18301da177e4SLinus Torvalds * suspended. 18311da177e4SLinus Torvalds * 18321da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 18331da177e4SLinus Torvalds */ 1834140d8f68SAlan Stern int usb_port_resume(struct usb_device *udev) 18351da177e4SLinus Torvalds { 1836d388dab7SAlan Stern int status; 18371da177e4SLinus Torvalds 1838140d8f68SAlan Stern /* we change the device's upstream USB link, 1839140d8f68SAlan Stern * but root hubs have no upstream USB link. 1840140d8f68SAlan Stern */ 1841f3f3253dSDavid Brownell if (udev->parent) { 18421da177e4SLinus Torvalds // NOTE this fails if parent is also suspended... 18431da177e4SLinus Torvalds status = hub_port_resume(hdev_to_hub(udev->parent), 184412c3da34SAlan Stern udev->portnum, udev); 1845645daaabSAlan Stern } else { 1846645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 1847645daaabSAlan Stern udev->auto_pm ? "auto-" : ""); 1848140d8f68SAlan Stern status = finish_port_resume(udev); 1849645daaabSAlan Stern } 1850f3f3253dSDavid Brownell if (status < 0) 1851a8e7c565SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 18521da177e4SLinus Torvalds return status; 18531da177e4SLinus Torvalds } 18541da177e4SLinus Torvalds 18551da177e4SLinus Torvalds static int remote_wakeup(struct usb_device *udev) 18561da177e4SLinus Torvalds { 18571da177e4SLinus Torvalds int status = 0; 18581da177e4SLinus Torvalds 18599ad3d6ccSAlan Stern usb_lock_device(udev); 18601da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 1861645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 18621941044aSAlan Stern usb_mark_last_busy(udev); 18636b157c9bSAlan Stern status = usb_external_resume_device(udev); 1864d25450c6SAlan Stern } 18659ad3d6ccSAlan Stern usb_unlock_device(udev); 18661da177e4SLinus Torvalds return status; 18671da177e4SLinus Torvalds } 18681da177e4SLinus Torvalds 1869d388dab7SAlan Stern #else /* CONFIG_USB_SUSPEND */ 1870d388dab7SAlan Stern 1871d388dab7SAlan Stern /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ 1872d388dab7SAlan Stern 1873d388dab7SAlan Stern int usb_port_suspend(struct usb_device *udev) 1874d388dab7SAlan Stern { 1875d388dab7SAlan Stern return 0; 1876d388dab7SAlan Stern } 1877d388dab7SAlan Stern 1878d388dab7SAlan Stern static inline int 1879d388dab7SAlan Stern finish_port_resume(struct usb_device *udev) 1880d388dab7SAlan Stern { 1881d388dab7SAlan Stern return 0; 1882d388dab7SAlan Stern } 1883d388dab7SAlan Stern 1884d388dab7SAlan Stern static inline int 1885d388dab7SAlan Stern hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev) 1886d388dab7SAlan Stern { 1887d388dab7SAlan Stern return 0; 1888d388dab7SAlan Stern } 1889d388dab7SAlan Stern 1890d388dab7SAlan Stern int usb_port_resume(struct usb_device *udev) 1891d388dab7SAlan Stern { 1892d388dab7SAlan Stern return 0; 1893d388dab7SAlan Stern } 1894d388dab7SAlan Stern 1895d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 1896d388dab7SAlan Stern { 1897d388dab7SAlan Stern return 0; 1898d388dab7SAlan Stern } 1899d388dab7SAlan Stern 1900d388dab7SAlan Stern #endif 1901d388dab7SAlan Stern 1902db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 19031da177e4SLinus Torvalds { 19041da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 19051da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 19061da177e4SLinus Torvalds unsigned port1; 190712f1ff83SAlan Stern int status = 0; 19081da177e4SLinus Torvalds 1909c9f89fa4SDavid Brownell /* fail if children aren't already suspended */ 19101da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 19111da177e4SLinus Torvalds struct usb_device *udev; 19121da177e4SLinus Torvalds 19131da177e4SLinus Torvalds udev = hdev->children [port1-1]; 1914114b368cSAlan Stern if (udev && msg.event == PM_EVENT_SUSPEND && 1915f3f3253dSDavid Brownell #ifdef CONFIG_USB_SUSPEND 1916114b368cSAlan Stern udev->state != USB_STATE_SUSPENDED 1917114b368cSAlan Stern #else 1918114b368cSAlan Stern udev->dev.power.power_state.event 1919114b368cSAlan Stern == PM_EVENT_ON 1920f3f3253dSDavid Brownell #endif 1921114b368cSAlan Stern ) { 1922645daaabSAlan Stern if (!hdev->auto_pm) 1923645daaabSAlan Stern dev_dbg(&intf->dev, "port %d nyet suspended\n", 1924645daaabSAlan Stern port1); 1925c9f89fa4SDavid Brownell return -EBUSY; 1926c9f89fa4SDavid Brownell } 19271da177e4SLinus Torvalds } 19281da177e4SLinus Torvalds 192940f122f3SAlan Stern dev_dbg(&intf->dev, "%s\n", __FUNCTION__); 193040f122f3SAlan Stern 1931c9f89fa4SDavid Brownell /* stop khubd and related activity */ 1932c9f89fa4SDavid Brownell hub_quiesce(hub); 193312f1ff83SAlan Stern 193412f1ff83SAlan Stern /* "global suspend" of the downstream HC-to-USB interface */ 193512f1ff83SAlan Stern if (!hdev->parent) { 193612f1ff83SAlan Stern status = hcd_bus_suspend(hdev->bus); 193712f1ff83SAlan Stern if (status != 0) { 193812f1ff83SAlan Stern dev_dbg(&hdev->dev, "'global' suspend %d\n", status); 193912f1ff83SAlan Stern hub_activate(hub); 194012f1ff83SAlan Stern } 194112f1ff83SAlan Stern } 194212f1ff83SAlan Stern return status; 19431da177e4SLinus Torvalds } 19441da177e4SLinus Torvalds 19451da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 19461da177e4SLinus Torvalds { 19471da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 194840f122f3SAlan Stern struct usb_device *hdev = hub->hdev; 19491da177e4SLinus Torvalds int status; 19501da177e4SLinus Torvalds 195140f122f3SAlan Stern dev_dbg(&intf->dev, "%s\n", __FUNCTION__); 195240f122f3SAlan Stern 1953f3f3253dSDavid Brownell /* "global resume" of the downstream HC-to-USB interface */ 1954f3f3253dSDavid Brownell if (!hdev->parent) { 1955f3f3253dSDavid Brownell struct usb_bus *bus = hdev->bus; 19560c0382e3SAlan Stern if (bus) { 19570c0382e3SAlan Stern status = hcd_bus_resume (bus); 1958f3f3253dSDavid Brownell if (status) { 1959f3f3253dSDavid Brownell dev_dbg(&intf->dev, "'global' resume %d\n", 1960f3f3253dSDavid Brownell status); 1961f3f3253dSDavid Brownell return status; 1962f3f3253dSDavid Brownell } 1963f3f3253dSDavid Brownell } else 1964f3f3253dSDavid Brownell return -EOPNOTSUPP; 1965f3f3253dSDavid Brownell if (status == 0) { 1966f3f3253dSDavid Brownell /* TRSMRCY = 10 msec */ 1967f3f3253dSDavid Brownell msleep(10); 1968f3f3253dSDavid Brownell } 1969f3f3253dSDavid Brownell } 1970f3f3253dSDavid Brownell 1971a8e7c565SAlan Stern /* tell khubd to look for changes on this hub */ 1972f3f3253dSDavid Brownell hub_activate(hub); 19731da177e4SLinus Torvalds return 0; 19741da177e4SLinus Torvalds } 19751da177e4SLinus Torvalds 1976d388dab7SAlan Stern #else /* CONFIG_PM */ 1977d388dab7SAlan Stern 1978d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 1979d388dab7SAlan Stern { 1980d388dab7SAlan Stern return 0; 1981d388dab7SAlan Stern } 1982d388dab7SAlan Stern 1983511366daSAndrew Morton #define hub_suspend NULL 1984511366daSAndrew Morton #define hub_resume NULL 1985d388dab7SAlan Stern #endif 1986d388dab7SAlan Stern 19871da177e4SLinus Torvalds 19881da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 19891da177e4SLinus Torvalds * 19901da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 19911da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 19921da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 19931da177e4SLinus Torvalds * 19941da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 19951da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 19961da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 19971da177e4SLinus Torvalds * 19981da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 19991da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 20001da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 20011da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 20021da177e4SLinus Torvalds */ 20031da177e4SLinus Torvalds 20041da177e4SLinus Torvalds #define HUB_DEBOUNCE_TIMEOUT 1500 20051da177e4SLinus Torvalds #define HUB_DEBOUNCE_STEP 25 20061da177e4SLinus Torvalds #define HUB_DEBOUNCE_STABLE 100 20071da177e4SLinus Torvalds 20081da177e4SLinus Torvalds static int hub_port_debounce(struct usb_hub *hub, int port1) 20091da177e4SLinus Torvalds { 20101da177e4SLinus Torvalds int ret; 20111da177e4SLinus Torvalds int total_time, stable_time = 0; 20121da177e4SLinus Torvalds u16 portchange, portstatus; 20131da177e4SLinus Torvalds unsigned connection = 0xffff; 20141da177e4SLinus Torvalds 20151da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 20161da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 20171da177e4SLinus Torvalds if (ret < 0) 20181da177e4SLinus Torvalds return ret; 20191da177e4SLinus Torvalds 20201da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 20211da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 20221da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 20231da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 20241da177e4SLinus Torvalds break; 20251da177e4SLinus Torvalds } else { 20261da177e4SLinus Torvalds stable_time = 0; 20271da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 20281da177e4SLinus Torvalds } 20291da177e4SLinus Torvalds 20301da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 20311da177e4SLinus Torvalds clear_port_feature(hub->hdev, port1, 20321da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 20331da177e4SLinus Torvalds } 20341da177e4SLinus Torvalds 20351da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 20361da177e4SLinus Torvalds break; 20371da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 20381da177e4SLinus Torvalds } 20391da177e4SLinus Torvalds 20401da177e4SLinus Torvalds dev_dbg (hub->intfdev, 20411da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 20421da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 20431da177e4SLinus Torvalds 20441da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 20451da177e4SLinus Torvalds return -ETIMEDOUT; 20461da177e4SLinus Torvalds return portstatus; 20471da177e4SLinus Torvalds } 20481da177e4SLinus Torvalds 20491da177e4SLinus Torvalds static void ep0_reinit(struct usb_device *udev) 20501da177e4SLinus Torvalds { 20511da177e4SLinus Torvalds usb_disable_endpoint(udev, 0 + USB_DIR_IN); 20521da177e4SLinus Torvalds usb_disable_endpoint(udev, 0 + USB_DIR_OUT); 20531da177e4SLinus Torvalds udev->ep_in[0] = udev->ep_out[0] = &udev->ep0; 20541da177e4SLinus Torvalds } 20551da177e4SLinus Torvalds 20561da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 20571da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 20581da177e4SLinus Torvalds 20591da177e4SLinus Torvalds static int hub_set_address(struct usb_device *udev) 20601da177e4SLinus Torvalds { 20611da177e4SLinus Torvalds int retval; 20621da177e4SLinus Torvalds 20631da177e4SLinus Torvalds if (udev->devnum == 0) 20641da177e4SLinus Torvalds return -EINVAL; 20651da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 20661da177e4SLinus Torvalds return 0; 20671da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 20681da177e4SLinus Torvalds return -EINVAL; 20691da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 20701da177e4SLinus Torvalds USB_REQ_SET_ADDRESS, 0, udev->devnum, 0, 20711da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 20721da177e4SLinus Torvalds if (retval == 0) { 20731da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 20741da177e4SLinus Torvalds ep0_reinit(udev); 20751da177e4SLinus Torvalds } 20761da177e4SLinus Torvalds return retval; 20771da177e4SLinus Torvalds } 20781da177e4SLinus Torvalds 20791da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 20801da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 20811da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 20821da177e4SLinus Torvalds * 20831da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 20841da177e4SLinus Torvalds * usb_reset_device), the caller must own the device lock. For a 20851da177e4SLinus Torvalds * newly detected device that is not accessible through any global 20861da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 20871da177e4SLinus Torvalds */ 20881da177e4SLinus Torvalds static int 20891da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 20901da177e4SLinus Torvalds int retry_counter) 20911da177e4SLinus Torvalds { 20924186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 20931da177e4SLinus Torvalds 20941da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 20951da177e4SLinus Torvalds int i, j, retval; 20961da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 20971da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 209883a07196SInaky Perez-Gonzalez char *speed, *type; 20991da177e4SLinus Torvalds 21001da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 21011da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 21021da177e4SLinus Torvalds */ 21031da177e4SLinus Torvalds if (!hdev->parent) { 21041da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 21051da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 21061da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 21071da177e4SLinus Torvalds } 21081da177e4SLinus Torvalds 21091da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 21101da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 21111da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 21121da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 21131da177e4SLinus Torvalds 21144186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 21151da177e4SLinus Torvalds 21161da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 21171da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 21181da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 21191da177e4SLinus Torvalds goto fail; 21201da177e4SLinus Torvalds /* success, speed is known */ 21211da177e4SLinus Torvalds retval = -ENODEV; 21221da177e4SLinus Torvalds 21231da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 21241da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 21251da177e4SLinus Torvalds goto fail; 21261da177e4SLinus Torvalds } 21271da177e4SLinus Torvalds oldspeed = udev->speed; 21281da177e4SLinus Torvalds 21291da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 21301da177e4SLinus Torvalds * it's fixed size except for full speed devices. 21315bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 21325bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 21331da177e4SLinus Torvalds */ 21341da177e4SLinus Torvalds switch (udev->speed) { 21355bb6e0aeSInaky Perez-Gonzalez case USB_SPEED_VARIABLE: /* fixed at 512 */ 21365bb6e0aeSInaky Perez-Gonzalez udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512); 21375bb6e0aeSInaky Perez-Gonzalez break; 21381da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 21391da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); 21401da177e4SLinus Torvalds break; 21411da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 21421da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 21431da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 21441da177e4SLinus Torvalds * then correct our initial guess. 21451da177e4SLinus Torvalds */ 21461da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); 21471da177e4SLinus Torvalds break; 21481da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 21491da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8); 21501da177e4SLinus Torvalds break; 21511da177e4SLinus Torvalds default: 21521da177e4SLinus Torvalds goto fail; 21531da177e4SLinus Torvalds } 21541da177e4SLinus Torvalds 215583a07196SInaky Perez-Gonzalez type = ""; 215683a07196SInaky Perez-Gonzalez switch (udev->speed) { 21571da177e4SLinus Torvalds case USB_SPEED_LOW: speed = "low"; break; 21581da177e4SLinus Torvalds case USB_SPEED_FULL: speed = "full"; break; 21591da177e4SLinus Torvalds case USB_SPEED_HIGH: speed = "high"; break; 216083a07196SInaky Perez-Gonzalez case USB_SPEED_VARIABLE: 216183a07196SInaky Perez-Gonzalez speed = "variable"; 216283a07196SInaky Perez-Gonzalez type = "Wireless "; 216383a07196SInaky Perez-Gonzalez break; 21641da177e4SLinus Torvalds default: speed = "?"; break; 216583a07196SInaky Perez-Gonzalez } 216683a07196SInaky Perez-Gonzalez dev_info (&udev->dev, 216783a07196SInaky Perez-Gonzalez "%s %s speed %sUSB device using %s and address %d\n", 216883a07196SInaky Perez-Gonzalez (udev->config) ? "reset" : "new", speed, type, 216983a07196SInaky Perez-Gonzalez udev->bus->controller->driver->name, udev->devnum); 21701da177e4SLinus Torvalds 21711da177e4SLinus Torvalds /* Set up TT records, if needed */ 21721da177e4SLinus Torvalds if (hdev->tt) { 21731da177e4SLinus Torvalds udev->tt = hdev->tt; 21741da177e4SLinus Torvalds udev->ttport = hdev->ttport; 21751da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 21761da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 21771da177e4SLinus Torvalds udev->tt = &hub->tt; 21781da177e4SLinus Torvalds udev->ttport = port1; 21791da177e4SLinus Torvalds } 21801da177e4SLinus Torvalds 21811da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 21821da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 21831da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 21841da177e4SLinus Torvalds * Change it cautiously. 21851da177e4SLinus Torvalds * 21861da177e4SLinus Torvalds * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 21871da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 21881da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 21891da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 21901da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 21911da177e4SLinus Torvalds * value. 21921da177e4SLinus Torvalds */ 21931da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 21941da177e4SLinus Torvalds if (USE_NEW_SCHEME(retry_counter)) { 21951da177e4SLinus Torvalds struct usb_device_descriptor *buf; 21961da177e4SLinus Torvalds int r = 0; 21971da177e4SLinus Torvalds 21981da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 21991da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 22001da177e4SLinus Torvalds if (!buf) { 22011da177e4SLinus Torvalds retval = -ENOMEM; 22021da177e4SLinus Torvalds continue; 22031da177e4SLinus Torvalds } 22041da177e4SLinus Torvalds 22051da177e4SLinus Torvalds /* Use a short timeout the first time through, 22061da177e4SLinus Torvalds * so that recalcitrant full-speed devices with 22071da177e4SLinus Torvalds * 8- or 16-byte ep0-maxpackets won't slow things 22081da177e4SLinus Torvalds * down tremendously by NAKing the unexpectedly 22091da177e4SLinus Torvalds * early status stage. Also, retry on all errors; 22101da177e4SLinus Torvalds * some devices are flakey. 22115bb6e0aeSInaky Perez-Gonzalez * 255 is for WUSB devices, we actually need to use 512. 22125bb6e0aeSInaky Perez-Gonzalez * WUSB1.0[4.8.1]. 22131da177e4SLinus Torvalds */ 22141da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 22151da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 22161da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 22171da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 22181da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 22191da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 22201da177e4SLinus Torvalds (i ? USB_CTRL_GET_TIMEOUT : 1000)); 22211da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 22225bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 22231da177e4SLinus Torvalds if (buf->bDescriptorType == 22241da177e4SLinus Torvalds USB_DT_DEVICE) { 22251da177e4SLinus Torvalds r = 0; 22261da177e4SLinus Torvalds break; 22271da177e4SLinus Torvalds } 22281da177e4SLinus Torvalds /* FALL THROUGH */ 22291da177e4SLinus Torvalds default: 22301da177e4SLinus Torvalds if (r == 0) 22311da177e4SLinus Torvalds r = -EPROTO; 22321da177e4SLinus Torvalds break; 22331da177e4SLinus Torvalds } 22341da177e4SLinus Torvalds if (r == 0) 22351da177e4SLinus Torvalds break; 22361da177e4SLinus Torvalds } 22371da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 22381da177e4SLinus Torvalds buf->bMaxPacketSize0; 22391da177e4SLinus Torvalds kfree(buf); 22401da177e4SLinus Torvalds 22411da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 22421da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 22431da177e4SLinus Torvalds goto fail; 22441da177e4SLinus Torvalds if (oldspeed != udev->speed) { 22451da177e4SLinus Torvalds dev_dbg(&udev->dev, 22461da177e4SLinus Torvalds "device reset changed speed!\n"); 22471da177e4SLinus Torvalds retval = -ENODEV; 22481da177e4SLinus Torvalds goto fail; 22491da177e4SLinus Torvalds } 22501da177e4SLinus Torvalds if (r) { 22511da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor " 22521da177e4SLinus Torvalds "read/%s, error %d\n", 22531da177e4SLinus Torvalds "64", r); 22541da177e4SLinus Torvalds retval = -EMSGSIZE; 22551da177e4SLinus Torvalds continue; 22561da177e4SLinus Torvalds } 22571da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 22581da177e4SLinus Torvalds } 22591da177e4SLinus Torvalds 22601da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 22611da177e4SLinus Torvalds retval = hub_set_address(udev); 22621da177e4SLinus Torvalds if (retval >= 0) 22631da177e4SLinus Torvalds break; 22641da177e4SLinus Torvalds msleep(200); 22651da177e4SLinus Torvalds } 22661da177e4SLinus Torvalds if (retval < 0) { 22671da177e4SLinus Torvalds dev_err(&udev->dev, 22681da177e4SLinus Torvalds "device not accepting address %d, error %d\n", 22691da177e4SLinus Torvalds udev->devnum, retval); 22701da177e4SLinus Torvalds goto fail; 22711da177e4SLinus Torvalds } 22721da177e4SLinus Torvalds 22731da177e4SLinus Torvalds /* cope with hardware quirkiness: 22741da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 22751da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 22761da177e4SLinus Torvalds */ 22771da177e4SLinus Torvalds msleep(10); 22781da177e4SLinus Torvalds if (USE_NEW_SCHEME(retry_counter)) 22791da177e4SLinus Torvalds break; 22801da177e4SLinus Torvalds 22811da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 22821da177e4SLinus Torvalds if (retval < 8) { 22831da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor " 22841da177e4SLinus Torvalds "read/%s, error %d\n", 22851da177e4SLinus Torvalds "8", retval); 22861da177e4SLinus Torvalds if (retval >= 0) 22871da177e4SLinus Torvalds retval = -EMSGSIZE; 22881da177e4SLinus Torvalds } else { 22891da177e4SLinus Torvalds retval = 0; 22901da177e4SLinus Torvalds break; 22911da177e4SLinus Torvalds } 22921da177e4SLinus Torvalds } 22931da177e4SLinus Torvalds if (retval) 22941da177e4SLinus Torvalds goto fail; 22951da177e4SLinus Torvalds 22965bb6e0aeSInaky Perez-Gonzalez i = udev->descriptor.bMaxPacketSize0 == 0xff? 22975bb6e0aeSInaky Perez-Gonzalez 512 : udev->descriptor.bMaxPacketSize0; 22981da177e4SLinus Torvalds if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { 22991da177e4SLinus Torvalds if (udev->speed != USB_SPEED_FULL || 23001da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 23011da177e4SLinus Torvalds dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); 23021da177e4SLinus Torvalds retval = -EMSGSIZE; 23031da177e4SLinus Torvalds goto fail; 23041da177e4SLinus Torvalds } 23051da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 23061da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 23071da177e4SLinus Torvalds ep0_reinit(udev); 23081da177e4SLinus Torvalds } 23091da177e4SLinus Torvalds 23101da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 23111da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 23121da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor read/%s, error %d\n", 23131da177e4SLinus Torvalds "all", retval); 23141da177e4SLinus Torvalds if (retval >= 0) 23151da177e4SLinus Torvalds retval = -ENOMSG; 23161da177e4SLinus Torvalds goto fail; 23171da177e4SLinus Torvalds } 23181da177e4SLinus Torvalds 23191da177e4SLinus Torvalds retval = 0; 23201da177e4SLinus Torvalds 23211da177e4SLinus Torvalds fail: 23221da177e4SLinus Torvalds if (retval) 23231da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 23244186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 23251da177e4SLinus Torvalds return retval; 23261da177e4SLinus Torvalds } 23271da177e4SLinus Torvalds 23281da177e4SLinus Torvalds static void 23291da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 23301da177e4SLinus Torvalds { 23311da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 23321da177e4SLinus Torvalds int status; 23331da177e4SLinus Torvalds 2334e94b1766SChristoph Lameter qual = kmalloc (sizeof *qual, GFP_KERNEL); 23351da177e4SLinus Torvalds if (qual == NULL) 23361da177e4SLinus Torvalds return; 23371da177e4SLinus Torvalds 23381da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 23391da177e4SLinus Torvalds qual, sizeof *qual); 23401da177e4SLinus Torvalds if (status == sizeof *qual) { 23411da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 23421da177e4SLinus Torvalds "connect to a high speed hub\n"); 23431da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 23441da177e4SLinus Torvalds if (hub->has_indicators) { 23451da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 2346c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 23471da177e4SLinus Torvalds } 23481da177e4SLinus Torvalds } 23491da177e4SLinus Torvalds kfree(qual); 23501da177e4SLinus Torvalds } 23511da177e4SLinus Torvalds 23521da177e4SLinus Torvalds static unsigned 23531da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 23541da177e4SLinus Torvalds { 23551da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 23561da177e4SLinus Torvalds int remaining; 235755c52718SAlan Stern int port1; 23581da177e4SLinus Torvalds 235955c52718SAlan Stern if (!hub->limited_power) 23601da177e4SLinus Torvalds return 0; 23611da177e4SLinus Torvalds 236255c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 236355c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 236455c52718SAlan Stern struct usb_device *udev = hdev->children[port1 - 1]; 236555c52718SAlan Stern int delta; 23661da177e4SLinus Torvalds 23671da177e4SLinus Torvalds if (!udev) 23681da177e4SLinus Torvalds continue; 23691da177e4SLinus Torvalds 237055c52718SAlan Stern /* Unconfigured devices may not use more than 100mA, 237155c52718SAlan Stern * or 8mA for OTG ports */ 23721da177e4SLinus Torvalds if (udev->actconfig) 237355c52718SAlan Stern delta = udev->actconfig->desc.bMaxPower * 2; 237455c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 237555c52718SAlan Stern delta = 100; 23761da177e4SLinus Torvalds else 237755c52718SAlan Stern delta = 8; 237855c52718SAlan Stern if (delta > hub->mA_per_port) 237955c52718SAlan Stern dev_warn(&udev->dev, "%dmA is over %umA budget " 238055c52718SAlan Stern "for port %d!\n", 238155c52718SAlan Stern delta, hub->mA_per_port, port1); 23821da177e4SLinus Torvalds remaining -= delta; 23831da177e4SLinus Torvalds } 23841da177e4SLinus Torvalds if (remaining < 0) { 238555c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 238655c52718SAlan Stern - remaining); 23871da177e4SLinus Torvalds remaining = 0; 23881da177e4SLinus Torvalds } 23891da177e4SLinus Torvalds return remaining; 23901da177e4SLinus Torvalds } 23911da177e4SLinus Torvalds 23921da177e4SLinus Torvalds /* Handle physical or logical connection change events. 23931da177e4SLinus Torvalds * This routine is called when: 23941da177e4SLinus Torvalds * a port connection-change occurs; 23951da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 23961da177e4SLinus Torvalds * usb_reset_device() encounters changed descriptors (as from 23971da177e4SLinus Torvalds * a firmware download) 23981da177e4SLinus Torvalds * caller already locked the hub 23991da177e4SLinus Torvalds */ 24001da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 24011da177e4SLinus Torvalds u16 portstatus, u16 portchange) 24021da177e4SLinus Torvalds { 24031da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 24041da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 240574ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 24061da177e4SLinus Torvalds int status, i; 24071da177e4SLinus Torvalds 24081da177e4SLinus Torvalds dev_dbg (hub_dev, 24091da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 24101da177e4SLinus Torvalds port1, portstatus, portchange, portspeed (portstatus)); 24111da177e4SLinus Torvalds 24121da177e4SLinus Torvalds if (hub->has_indicators) { 24131da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 24141da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 24151da177e4SLinus Torvalds } 24161da177e4SLinus Torvalds 24171da177e4SLinus Torvalds /* Disconnect any existing devices under this port */ 24181da177e4SLinus Torvalds if (hdev->children[port1-1]) 24191da177e4SLinus Torvalds usb_disconnect(&hdev->children[port1-1]); 24201da177e4SLinus Torvalds clear_bit(port1, hub->change_bits); 24211da177e4SLinus Torvalds 24221da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 24231da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 24241da177e4SLinus Torvalds if (hdev->bus->is_b_host) 24251da177e4SLinus Torvalds portchange &= ~USB_PORT_STAT_C_CONNECTION; 24261da177e4SLinus Torvalds #endif 24271da177e4SLinus Torvalds 24281da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 24291da177e4SLinus Torvalds status = hub_port_debounce(hub, port1); 24307bc4b81dSOliver Neukum if (status < 0 && printk_ratelimit()) { 24311da177e4SLinus Torvalds dev_err (hub_dev, 24321da177e4SLinus Torvalds "connect-debounce failed, port %d disabled\n", 24331da177e4SLinus Torvalds port1); 24341da177e4SLinus Torvalds goto done; 24351da177e4SLinus Torvalds } 24361da177e4SLinus Torvalds portstatus = status; 24371da177e4SLinus Torvalds } 24381da177e4SLinus Torvalds 24391da177e4SLinus Torvalds /* Return now if nothing is connected */ 24401da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) { 24411da177e4SLinus Torvalds 24421da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 244374ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 24441da177e4SLinus Torvalds && !(portstatus & (1 << USB_PORT_FEAT_POWER))) 24451da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 24461da177e4SLinus Torvalds 24471da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 24481da177e4SLinus Torvalds goto done; 24491da177e4SLinus Torvalds return; 24501da177e4SLinus Torvalds } 24511da177e4SLinus Torvalds 24521da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 24531da177e4SLinus Torvalds /* If something is connected, but the port is suspended, wake it up. */ 24541da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_SUSPEND) { 24551da177e4SLinus Torvalds status = hub_port_resume(hub, port1, NULL); 24561da177e4SLinus Torvalds if (status < 0) { 24571da177e4SLinus Torvalds dev_dbg(hub_dev, 24581da177e4SLinus Torvalds "can't clear suspend on port %d; %d\n", 24591da177e4SLinus Torvalds port1, status); 24601da177e4SLinus Torvalds goto done; 24611da177e4SLinus Torvalds } 24621da177e4SLinus Torvalds } 24631da177e4SLinus Torvalds #endif 24641da177e4SLinus Torvalds 24651da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 24661da177e4SLinus Torvalds struct usb_device *udev; 24671da177e4SLinus Torvalds 24681da177e4SLinus Torvalds /* reallocate for each attempt, since references 24691da177e4SLinus Torvalds * to the previous one can escape in various ways 24701da177e4SLinus Torvalds */ 24711da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 24721da177e4SLinus Torvalds if (!udev) { 24731da177e4SLinus Torvalds dev_err (hub_dev, 24741da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 24751da177e4SLinus Torvalds port1); 24761da177e4SLinus Torvalds goto done; 24771da177e4SLinus Torvalds } 24781da177e4SLinus Torvalds 24791da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 24801da177e4SLinus Torvalds udev->speed = USB_SPEED_UNKNOWN; 248155c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 2482b6956ffaSAlan Stern udev->level = hdev->level + 1; 24831da177e4SLinus Torvalds 24841da177e4SLinus Torvalds /* set the address */ 24851da177e4SLinus Torvalds choose_address(udev); 24861da177e4SLinus Torvalds if (udev->devnum <= 0) { 24871da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 24881da177e4SLinus Torvalds goto loop; 24891da177e4SLinus Torvalds } 24901da177e4SLinus Torvalds 24911da177e4SLinus Torvalds /* reset and get descriptor */ 24921da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 24931da177e4SLinus Torvalds if (status < 0) 24941da177e4SLinus Torvalds goto loop; 24951da177e4SLinus Torvalds 24961da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 24971da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 24981da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 24991da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 25001da177e4SLinus Torvalds * on the parent. 25011da177e4SLinus Torvalds */ 25021da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 250355c52718SAlan Stern && udev->bus_mA <= 100) { 25041da177e4SLinus Torvalds u16 devstat; 25051da177e4SLinus Torvalds 25061da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 25071da177e4SLinus Torvalds &devstat); 250855c52718SAlan Stern if (status < 2) { 25091da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 25101da177e4SLinus Torvalds goto loop_disable; 25111da177e4SLinus Torvalds } 251255c52718SAlan Stern le16_to_cpus(&devstat); 25131da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 25141da177e4SLinus Torvalds dev_err(&udev->dev, 25151da177e4SLinus Torvalds "can't connect bus-powered hub " 25161da177e4SLinus Torvalds "to this port\n"); 25171da177e4SLinus Torvalds if (hub->has_indicators) { 25181da177e4SLinus Torvalds hub->indicator[port1-1] = 25191da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 2520c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 25211da177e4SLinus Torvalds } 25221da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 25231da177e4SLinus Torvalds goto loop_disable; 25241da177e4SLinus Torvalds } 25251da177e4SLinus Torvalds } 25261da177e4SLinus Torvalds 25271da177e4SLinus Torvalds /* check for devices running slower than they could */ 25281da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 25291da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 25301da177e4SLinus Torvalds && highspeed_hubs != 0) 25311da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 25321da177e4SLinus Torvalds 25331da177e4SLinus Torvalds /* Store the parent's children[] pointer. At this point 25341da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 25351da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 25361da177e4SLinus Torvalds */ 25371da177e4SLinus Torvalds status = 0; 25381da177e4SLinus Torvalds 25391da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 25401da177e4SLinus Torvalds * been disconnected; we would race with the 25411da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 25421da177e4SLinus Torvalds */ 25431da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 25441da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 25451da177e4SLinus Torvalds status = -ENOTCONN; 25461da177e4SLinus Torvalds else 25471da177e4SLinus Torvalds hdev->children[port1-1] = udev; 25481da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 25491da177e4SLinus Torvalds 25501da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 25511da177e4SLinus Torvalds if (!status) { 25521da177e4SLinus Torvalds status = usb_new_device(udev); 25531da177e4SLinus Torvalds if (status) { 25541da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 25551da177e4SLinus Torvalds hdev->children[port1-1] = NULL; 25561da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 25571da177e4SLinus Torvalds } 25581da177e4SLinus Torvalds } 25591da177e4SLinus Torvalds 25601da177e4SLinus Torvalds if (status) 25611da177e4SLinus Torvalds goto loop_disable; 25621da177e4SLinus Torvalds 25631da177e4SLinus Torvalds status = hub_power_remaining(hub); 25641da177e4SLinus Torvalds if (status) 256555c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 25661da177e4SLinus Torvalds 25671da177e4SLinus Torvalds return; 25681da177e4SLinus Torvalds 25691da177e4SLinus Torvalds loop_disable: 25701da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 25711da177e4SLinus Torvalds loop: 25721da177e4SLinus Torvalds ep0_reinit(udev); 25731da177e4SLinus Torvalds release_address(udev); 25741da177e4SLinus Torvalds usb_put_dev(udev); 25751da177e4SLinus Torvalds if (status == -ENOTCONN) 25761da177e4SLinus Torvalds break; 25771da177e4SLinus Torvalds } 25781da177e4SLinus Torvalds 25791da177e4SLinus Torvalds done: 25801da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 25811da177e4SLinus Torvalds } 25821da177e4SLinus Torvalds 25831da177e4SLinus Torvalds static void hub_events(void) 25841da177e4SLinus Torvalds { 25851da177e4SLinus Torvalds struct list_head *tmp; 25861da177e4SLinus Torvalds struct usb_device *hdev; 25871da177e4SLinus Torvalds struct usb_interface *intf; 25881da177e4SLinus Torvalds struct usb_hub *hub; 25891da177e4SLinus Torvalds struct device *hub_dev; 25901da177e4SLinus Torvalds u16 hubstatus; 25911da177e4SLinus Torvalds u16 hubchange; 25921da177e4SLinus Torvalds u16 portstatus; 25931da177e4SLinus Torvalds u16 portchange; 25941da177e4SLinus Torvalds int i, ret; 25951da177e4SLinus Torvalds int connect_change; 25961da177e4SLinus Torvalds 25971da177e4SLinus Torvalds /* 25981da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 25991da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 26001da177e4SLinus Torvalds * safe since we delete the hub from the event list. 26011da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 26021da177e4SLinus Torvalds */ 26031da177e4SLinus Torvalds while (1) { 26041da177e4SLinus Torvalds 26051da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 26061da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 26071da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 26081da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 26091da177e4SLinus Torvalds break; 26101da177e4SLinus Torvalds } 26111da177e4SLinus Torvalds 26121da177e4SLinus Torvalds tmp = hub_event_list.next; 26131da177e4SLinus Torvalds list_del_init(tmp); 26141da177e4SLinus Torvalds 26151da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 26161da177e4SLinus Torvalds hdev = hub->hdev; 26171da177e4SLinus Torvalds intf = to_usb_interface(hub->intfdev); 26181da177e4SLinus Torvalds hub_dev = &intf->dev; 26191da177e4SLinus Torvalds 262040f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 26211da177e4SLinus Torvalds hdev->state, hub->descriptor 26221da177e4SLinus Torvalds ? hub->descriptor->bNbrPorts 26231da177e4SLinus Torvalds : 0, 26241da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 26251da177e4SLinus Torvalds (u16) hub->change_bits[0], 262640f122f3SAlan Stern (u16) hub->event_bits[0]); 26271da177e4SLinus Torvalds 26281da177e4SLinus Torvalds usb_get_intf(intf); 26291da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 26301da177e4SLinus Torvalds 26311da177e4SLinus Torvalds /* Lock the device, then check to see if we were 26321da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 26331da177e4SLinus Torvalds if (locktree(hdev) < 0) { 26341da177e4SLinus Torvalds usb_put_intf(intf); 26351da177e4SLinus Torvalds continue; 26361da177e4SLinus Torvalds } 26371da177e4SLinus Torvalds if (hub != usb_get_intfdata(intf)) 26381da177e4SLinus Torvalds goto loop; 26391da177e4SLinus Torvalds 26401da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 26411da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 26427de18d8bSAlan Stern hub->error = -ENODEV; 26437de18d8bSAlan Stern hub_pre_reset(intf); 26441da177e4SLinus Torvalds goto loop; 26451da177e4SLinus Torvalds } 26461da177e4SLinus Torvalds 264740f122f3SAlan Stern /* Autoresume */ 264840f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 264940f122f3SAlan Stern if (ret) { 265040f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 26511da177e4SLinus Torvalds goto loop; 265240f122f3SAlan Stern } 265340f122f3SAlan Stern 265440f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 265540f122f3SAlan Stern if (hub->quiescing) 265640f122f3SAlan Stern goto loop_autopm; 26571da177e4SLinus Torvalds 26581da177e4SLinus Torvalds if (hub->error) { 26591da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 26601da177e4SLinus Torvalds hub->error); 26611da177e4SLinus Torvalds 26627de18d8bSAlan Stern ret = usb_reset_composite_device(hdev, intf); 26631da177e4SLinus Torvalds if (ret) { 26641da177e4SLinus Torvalds dev_dbg (hub_dev, 26651da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 266640f122f3SAlan Stern goto loop_autopm; 26671da177e4SLinus Torvalds } 26681da177e4SLinus Torvalds 26691da177e4SLinus Torvalds hub->nerrors = 0; 26701da177e4SLinus Torvalds hub->error = 0; 26711da177e4SLinus Torvalds } 26721da177e4SLinus Torvalds 26731da177e4SLinus Torvalds /* deal with port status changes */ 26741da177e4SLinus Torvalds for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { 26751da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 26761da177e4SLinus Torvalds continue; 26771da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 26781da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 26791da177e4SLinus Torvalds !connect_change && !hub->activating) 26801da177e4SLinus Torvalds continue; 26811da177e4SLinus Torvalds 26821da177e4SLinus Torvalds ret = hub_port_status(hub, i, 26831da177e4SLinus Torvalds &portstatus, &portchange); 26841da177e4SLinus Torvalds if (ret < 0) 26851da177e4SLinus Torvalds continue; 26861da177e4SLinus Torvalds 26871da177e4SLinus Torvalds if (hub->activating && !hdev->children[i-1] && 26881da177e4SLinus Torvalds (portstatus & 26891da177e4SLinus Torvalds USB_PORT_STAT_CONNECTION)) 26901da177e4SLinus Torvalds connect_change = 1; 26911da177e4SLinus Torvalds 26921da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 26931da177e4SLinus Torvalds clear_port_feature(hdev, i, 26941da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 26951da177e4SLinus Torvalds connect_change = 1; 26961da177e4SLinus Torvalds } 26971da177e4SLinus Torvalds 26981da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 26991da177e4SLinus Torvalds if (!connect_change) 27001da177e4SLinus Torvalds dev_dbg (hub_dev, 27011da177e4SLinus Torvalds "port %d enable change, " 27021da177e4SLinus Torvalds "status %08x\n", 27031da177e4SLinus Torvalds i, portstatus); 27041da177e4SLinus Torvalds clear_port_feature(hdev, i, 27051da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 27061da177e4SLinus Torvalds 27071da177e4SLinus Torvalds /* 27081da177e4SLinus Torvalds * EM interference sometimes causes badly 27091da177e4SLinus Torvalds * shielded USB devices to be shutdown by 27101da177e4SLinus Torvalds * the hub, this hack enables them again. 27111da177e4SLinus Torvalds * Works at least with mouse driver. 27121da177e4SLinus Torvalds */ 27131da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 27141da177e4SLinus Torvalds && !connect_change 27151da177e4SLinus Torvalds && hdev->children[i-1]) { 27161da177e4SLinus Torvalds dev_err (hub_dev, 27171da177e4SLinus Torvalds "port %i " 27181da177e4SLinus Torvalds "disabled by hub (EMI?), " 27191da177e4SLinus Torvalds "re-enabling...\n", 27201da177e4SLinus Torvalds i); 27211da177e4SLinus Torvalds connect_change = 1; 27221da177e4SLinus Torvalds } 27231da177e4SLinus Torvalds } 27241da177e4SLinus Torvalds 27251da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_SUSPEND) { 27261da177e4SLinus Torvalds clear_port_feature(hdev, i, 27271da177e4SLinus Torvalds USB_PORT_FEAT_C_SUSPEND); 27281da177e4SLinus Torvalds if (hdev->children[i-1]) { 27291da177e4SLinus Torvalds ret = remote_wakeup(hdev-> 27301da177e4SLinus Torvalds children[i-1]); 27311da177e4SLinus Torvalds if (ret < 0) 27321da177e4SLinus Torvalds connect_change = 1; 27331da177e4SLinus Torvalds } else { 27341da177e4SLinus Torvalds ret = -ENODEV; 27351da177e4SLinus Torvalds hub_port_disable(hub, i, 1); 27361da177e4SLinus Torvalds } 27371da177e4SLinus Torvalds dev_dbg (hub_dev, 27381da177e4SLinus Torvalds "resume on port %d, status %d\n", 27391da177e4SLinus Torvalds i, ret); 27401da177e4SLinus Torvalds } 27411da177e4SLinus Torvalds 27421da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 27431da177e4SLinus Torvalds dev_err (hub_dev, 27441da177e4SLinus Torvalds "over-current change on port %d\n", 27451da177e4SLinus Torvalds i); 27461da177e4SLinus Torvalds clear_port_feature(hdev, i, 27471da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 27481da177e4SLinus Torvalds hub_power_on(hub); 27491da177e4SLinus Torvalds } 27501da177e4SLinus Torvalds 27511da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 27521da177e4SLinus Torvalds dev_dbg (hub_dev, 27531da177e4SLinus Torvalds "reset change on port %d\n", 27541da177e4SLinus Torvalds i); 27551da177e4SLinus Torvalds clear_port_feature(hdev, i, 27561da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 27571da177e4SLinus Torvalds } 27581da177e4SLinus Torvalds 27591da177e4SLinus Torvalds if (connect_change) 27601da177e4SLinus Torvalds hub_port_connect_change(hub, i, 27611da177e4SLinus Torvalds portstatus, portchange); 27621da177e4SLinus Torvalds } /* end for i */ 27631da177e4SLinus Torvalds 27641da177e4SLinus Torvalds /* deal with hub status changes */ 27651da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 27661da177e4SLinus Torvalds ; /* do nothing */ 27671da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 27681da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 27691da177e4SLinus Torvalds else { 27701da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 27711da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 27721da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 277355c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 277455c52718SAlan Stern /* FIXME: Is this always true? */ 277555c52718SAlan Stern hub->limited_power = 0; 277655c52718SAlan Stern else 277755c52718SAlan Stern hub->limited_power = 1; 27781da177e4SLinus Torvalds } 27791da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 27801da177e4SLinus Torvalds dev_dbg (hub_dev, "overcurrent change\n"); 27811da177e4SLinus Torvalds msleep(500); /* Cool down */ 27821da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 27831da177e4SLinus Torvalds hub_power_on(hub); 27841da177e4SLinus Torvalds } 27851da177e4SLinus Torvalds } 27861da177e4SLinus Torvalds 27871da177e4SLinus Torvalds hub->activating = 0; 27881da177e4SLinus Torvalds 2789d5926ae7SAlan Stern /* If this is a root hub, tell the HCD it's okay to 2790d5926ae7SAlan Stern * re-enable port-change interrupts now. */ 2791d5cbad4bSAlan Stern if (!hdev->parent && !hub->busy_bits[0]) 2792d5926ae7SAlan Stern usb_enable_root_hub_irq(hdev->bus); 2793d5926ae7SAlan Stern 279440f122f3SAlan Stern loop_autopm: 279540f122f3SAlan Stern /* Allow autosuspend if we're not going to run again */ 279640f122f3SAlan Stern if (list_empty(&hub->event_list)) 279740f122f3SAlan Stern usb_autopm_enable(intf); 27981da177e4SLinus Torvalds loop: 27991da177e4SLinus Torvalds usb_unlock_device(hdev); 28001da177e4SLinus Torvalds usb_put_intf(intf); 28011da177e4SLinus Torvalds 28021da177e4SLinus Torvalds } /* end while (1) */ 28031da177e4SLinus Torvalds } 28041da177e4SLinus Torvalds 28051da177e4SLinus Torvalds static int hub_thread(void *__unused) 28061da177e4SLinus Torvalds { 28071da177e4SLinus Torvalds do { 28081da177e4SLinus Torvalds hub_events(); 28099c8d6178Sakpm@osdl.org wait_event_interruptible(khubd_wait, 28109c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 28119c8d6178Sakpm@osdl.org kthread_should_stop()); 28123e1d1d28SChristoph Lameter try_to_freeze(); 28139c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 28141da177e4SLinus Torvalds 28151da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 28169c8d6178Sakpm@osdl.org return 0; 28171da177e4SLinus Torvalds } 28181da177e4SLinus Torvalds 28191da177e4SLinus Torvalds static struct usb_device_id hub_id_table [] = { 28201da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 28211da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 28221da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 28231da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 28241da177e4SLinus Torvalds { } /* Terminating entry */ 28251da177e4SLinus Torvalds }; 28261da177e4SLinus Torvalds 28271da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 28281da177e4SLinus Torvalds 28291da177e4SLinus Torvalds static struct usb_driver hub_driver = { 28301da177e4SLinus Torvalds .name = "hub", 28311da177e4SLinus Torvalds .probe = hub_probe, 28321da177e4SLinus Torvalds .disconnect = hub_disconnect, 28331da177e4SLinus Torvalds .suspend = hub_suspend, 28341da177e4SLinus Torvalds .resume = hub_resume, 28357de18d8bSAlan Stern .pre_reset = hub_pre_reset, 28367de18d8bSAlan Stern .post_reset = hub_post_reset, 28371da177e4SLinus Torvalds .ioctl = hub_ioctl, 28381da177e4SLinus Torvalds .id_table = hub_id_table, 283940f122f3SAlan Stern .supports_autosuspend = 1, 28401da177e4SLinus Torvalds }; 28411da177e4SLinus Torvalds 28421da177e4SLinus Torvalds int usb_hub_init(void) 28431da177e4SLinus Torvalds { 28441da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 28451da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 28461da177e4SLinus Torvalds usbcore_name); 28471da177e4SLinus Torvalds return -1; 28481da177e4SLinus Torvalds } 28491da177e4SLinus Torvalds 28509c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 28519c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 28521da177e4SLinus Torvalds return 0; 28531da177e4SLinus Torvalds 28541da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 28551da177e4SLinus Torvalds usb_deregister(&hub_driver); 28561da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 28571da177e4SLinus Torvalds 28581da177e4SLinus Torvalds return -1; 28591da177e4SLinus Torvalds } 28601da177e4SLinus Torvalds 28611da177e4SLinus Torvalds void usb_hub_cleanup(void) 28621da177e4SLinus Torvalds { 28639c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 28641da177e4SLinus Torvalds 28651da177e4SLinus Torvalds /* 28661da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 28671da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 28681da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 28691da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 28701da177e4SLinus Torvalds * individual hub resources. -greg 28711da177e4SLinus Torvalds */ 28721da177e4SLinus Torvalds usb_deregister(&hub_driver); 28731da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 28741da177e4SLinus Torvalds 28751da177e4SLinus Torvalds static int config_descriptors_changed(struct usb_device *udev) 28761da177e4SLinus Torvalds { 28771da177e4SLinus Torvalds unsigned index; 28781da177e4SLinus Torvalds unsigned len = 0; 28791da177e4SLinus Torvalds struct usb_config_descriptor *buf; 28801da177e4SLinus Torvalds 28811da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 28821da177e4SLinus Torvalds if (len < le16_to_cpu(udev->config[index].desc.wTotalLength)) 28831da177e4SLinus Torvalds len = le16_to_cpu(udev->config[index].desc.wTotalLength); 28841da177e4SLinus Torvalds } 2885e94b1766SChristoph Lameter buf = kmalloc (len, GFP_KERNEL); 28861da177e4SLinus Torvalds if (buf == NULL) { 28871da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 28881da177e4SLinus Torvalds /* assume the worst */ 28891da177e4SLinus Torvalds return 1; 28901da177e4SLinus Torvalds } 28911da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 28921da177e4SLinus Torvalds int length; 28931da177e4SLinus Torvalds int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 28941da177e4SLinus Torvalds 28951da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 28961da177e4SLinus Torvalds old_length); 28971da177e4SLinus Torvalds if (length < old_length) { 28981da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 28991da177e4SLinus Torvalds index, length); 29001da177e4SLinus Torvalds break; 29011da177e4SLinus Torvalds } 29021da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 29031da177e4SLinus Torvalds != 0) { 29041da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 29051da177e4SLinus Torvalds index, buf->bConfigurationValue); 29061da177e4SLinus Torvalds break; 29071da177e4SLinus Torvalds } 29081da177e4SLinus Torvalds } 29091da177e4SLinus Torvalds kfree(buf); 29101da177e4SLinus Torvalds return index != udev->descriptor.bNumConfigurations; 29111da177e4SLinus Torvalds } 29121da177e4SLinus Torvalds 29131da177e4SLinus Torvalds /** 29141da177e4SLinus Torvalds * usb_reset_device - perform a USB port reset to reinitialize a device 29151da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 29161da177e4SLinus Torvalds * 291779efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 291879efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 291979efa097SAlan Stern * Use usb_reset_composite_device() instead. 29201da177e4SLinus Torvalds * 29211da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 29221da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 29231da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 29241da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 29251da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 29261da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 29271da177e4SLinus Torvalds * re-enumerated and probed all over again. 29281da177e4SLinus Torvalds * 29291da177e4SLinus Torvalds * Returns 0 if the reset succeeded, -ENODEV if the device has been 29301da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 29311da177e4SLinus Torvalds * if the reset wasn't even attempted. 29321da177e4SLinus Torvalds * 29331da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 29341da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 29351da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 29361da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 29371da177e4SLinus Torvalds */ 29381da177e4SLinus Torvalds int usb_reset_device(struct usb_device *udev) 29391da177e4SLinus Torvalds { 29401da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 29411da177e4SLinus Torvalds struct usb_hub *parent_hub; 29421da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 294312c3da34SAlan Stern int i, ret = 0; 294412c3da34SAlan Stern int port1 = udev->portnum; 29451da177e4SLinus Torvalds 29461da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 29471da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 29481da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 29491da177e4SLinus Torvalds udev->state); 29501da177e4SLinus Torvalds return -EINVAL; 29511da177e4SLinus Torvalds } 29521da177e4SLinus Torvalds 29531da177e4SLinus Torvalds if (!parent_hdev) { 29541da177e4SLinus Torvalds /* this requires hcd-specific logic; see OHCI hc_restart() */ 29551da177e4SLinus Torvalds dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__); 29561da177e4SLinus Torvalds return -EISDIR; 29571da177e4SLinus Torvalds } 29581da177e4SLinus Torvalds parent_hub = hdev_to_hub(parent_hdev); 29591da177e4SLinus Torvalds 29601da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 29611da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 29621da177e4SLinus Torvalds 29631da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 29641da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 29651da177e4SLinus Torvalds ep0_reinit(udev); 29661da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 29671da177e4SLinus Torvalds if (ret >= 0) 29681da177e4SLinus Torvalds break; 29691da177e4SLinus Torvalds } 29701da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 2971d5cbad4bSAlan Stern if (!parent_hdev->parent && !parent_hub->busy_bits[0]) 2972d5cbad4bSAlan Stern usb_enable_root_hub_irq(parent_hdev->bus); 2973d5cbad4bSAlan Stern 29741da177e4SLinus Torvalds if (ret < 0) 29751da177e4SLinus Torvalds goto re_enumerate; 29761da177e4SLinus Torvalds 29771da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 29781da177e4SLinus Torvalds if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor) 29791da177e4SLinus Torvalds || config_descriptors_changed (udev)) { 29801da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 29811da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 29821da177e4SLinus Torvalds goto re_enumerate; 29831da177e4SLinus Torvalds } 29841da177e4SLinus Torvalds 29851da177e4SLinus Torvalds if (!udev->actconfig) 29861da177e4SLinus Torvalds goto done; 29871da177e4SLinus Torvalds 29881da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 29891da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 29901da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 29911da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 29921da177e4SLinus Torvalds if (ret < 0) { 29931da177e4SLinus Torvalds dev_err(&udev->dev, 29941da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 29951da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 29961da177e4SLinus Torvalds goto re_enumerate; 29971da177e4SLinus Torvalds } 29981da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 29991da177e4SLinus Torvalds 30001da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 30011da177e4SLinus Torvalds struct usb_interface *intf = udev->actconfig->interface[i]; 30021da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 30031da177e4SLinus Torvalds 30041da177e4SLinus Torvalds /* set_interface resets host side toggle even 30051da177e4SLinus Torvalds * for altsetting zero. the interface may have no driver. 30061da177e4SLinus Torvalds */ 30071da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 30081da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 30091da177e4SLinus Torvalds desc->bAlternateSetting); 30101da177e4SLinus Torvalds if (ret < 0) { 30111da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 30121da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 30131da177e4SLinus Torvalds desc->bInterfaceNumber, 30141da177e4SLinus Torvalds desc->bAlternateSetting, 30151da177e4SLinus Torvalds ret); 30161da177e4SLinus Torvalds goto re_enumerate; 30171da177e4SLinus Torvalds } 30181da177e4SLinus Torvalds } 30191da177e4SLinus Torvalds 30201da177e4SLinus Torvalds done: 30211da177e4SLinus Torvalds return 0; 30221da177e4SLinus Torvalds 30231da177e4SLinus Torvalds re_enumerate: 30241da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 30251da177e4SLinus Torvalds return -ENODEV; 30261da177e4SLinus Torvalds } 3027140d8f68SAlan Stern EXPORT_SYMBOL(usb_reset_device); 302879efa097SAlan Stern 302979efa097SAlan Stern /** 303079efa097SAlan Stern * usb_reset_composite_device - warn interface drivers and perform a USB port reset 303179efa097SAlan Stern * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 303279efa097SAlan Stern * @iface: interface bound to the driver making the request (optional) 303379efa097SAlan Stern * 303479efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 303579efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 303679efa097SAlan Stern * the reset is over (using their post_reset method). 303779efa097SAlan Stern * 303879efa097SAlan Stern * Return value is the same as for usb_reset_device(). 303979efa097SAlan Stern * 304079efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 304179efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 304279efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 304379efa097SAlan Stern * the device using usb_lock_device_for_reset(). 304479efa097SAlan Stern * 304579efa097SAlan Stern * The interface locks are acquired during the pre_reset stage and released 304679efa097SAlan Stern * during the post_reset stage. However if iface is not NULL and is 304779efa097SAlan Stern * currently being probed, we assume that the caller already owns its 304879efa097SAlan Stern * lock. 304979efa097SAlan Stern */ 305079efa097SAlan Stern int usb_reset_composite_device(struct usb_device *udev, 305179efa097SAlan Stern struct usb_interface *iface) 305279efa097SAlan Stern { 305379efa097SAlan Stern int ret; 305479efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 305579efa097SAlan Stern 305679efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 305779efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 305879efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 305979efa097SAlan Stern udev->state); 306079efa097SAlan Stern return -EINVAL; 306179efa097SAlan Stern } 306279efa097SAlan Stern 3063645daaabSAlan Stern /* Prevent autosuspend during the reset */ 306494fcda1fSAlan Stern usb_autoresume_device(udev); 3065645daaabSAlan Stern 306679efa097SAlan Stern if (iface && iface->condition != USB_INTERFACE_BINDING) 306779efa097SAlan Stern iface = NULL; 306879efa097SAlan Stern 306979efa097SAlan Stern if (config) { 307079efa097SAlan Stern int i; 307179efa097SAlan Stern struct usb_interface *cintf; 307279efa097SAlan Stern struct usb_driver *drv; 307379efa097SAlan Stern 307479efa097SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 307579efa097SAlan Stern cintf = config->interface[i]; 307679efa097SAlan Stern if (cintf != iface) 307779efa097SAlan Stern down(&cintf->dev.sem); 307879efa097SAlan Stern if (device_is_registered(&cintf->dev) && 307979efa097SAlan Stern cintf->dev.driver) { 308079efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 308179efa097SAlan Stern if (drv->pre_reset) 308279efa097SAlan Stern (drv->pre_reset)(cintf); 308379efa097SAlan Stern } 308479efa097SAlan Stern } 308579efa097SAlan Stern } 308679efa097SAlan Stern 308779efa097SAlan Stern ret = usb_reset_device(udev); 308879efa097SAlan Stern 308979efa097SAlan Stern if (config) { 309079efa097SAlan Stern int i; 309179efa097SAlan Stern struct usb_interface *cintf; 309279efa097SAlan Stern struct usb_driver *drv; 309379efa097SAlan Stern 309479efa097SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 309579efa097SAlan Stern cintf = config->interface[i]; 309679efa097SAlan Stern if (device_is_registered(&cintf->dev) && 309779efa097SAlan Stern cintf->dev.driver) { 309879efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 309979efa097SAlan Stern if (drv->post_reset) 310079efa097SAlan Stern (drv->post_reset)(cintf); 310179efa097SAlan Stern } 310279efa097SAlan Stern if (cintf != iface) 310379efa097SAlan Stern up(&cintf->dev.sem); 310479efa097SAlan Stern } 310579efa097SAlan Stern } 310679efa097SAlan Stern 310794fcda1fSAlan Stern usb_autosuspend_device(udev); 310879efa097SAlan Stern return ret; 310979efa097SAlan Stern } 3110140d8f68SAlan Stern EXPORT_SYMBOL(usb_reset_composite_device); 3111