11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * USB hub driver. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * (C) Copyright 1999 Linus Torvalds 51da177e4SLinus Torvalds * (C) Copyright 1999 Johannes Erdfelt 61da177e4SLinus Torvalds * (C) Copyright 1999 Gregory P. Smith 71da177e4SLinus Torvalds * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds 111da177e4SLinus Torvalds #include <linux/kernel.h> 121da177e4SLinus Torvalds #include <linux/errno.h> 131da177e4SLinus Torvalds #include <linux/module.h> 141da177e4SLinus Torvalds #include <linux/moduleparam.h> 151da177e4SLinus Torvalds #include <linux/completion.h> 161da177e4SLinus Torvalds #include <linux/sched.h> 171da177e4SLinus Torvalds #include <linux/list.h> 181da177e4SLinus Torvalds #include <linux/slab.h> 191da177e4SLinus Torvalds #include <linux/ioctl.h> 201da177e4SLinus Torvalds #include <linux/usb.h> 211da177e4SLinus Torvalds #include <linux/usbdevice_fs.h> 229c8d6178Sakpm@osdl.org #include <linux/kthread.h> 234186ecf8SArjan van de Ven #include <linux/mutex.h> 247dfb7103SNigel Cunningham #include <linux/freezer.h> 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #include <asm/semaphore.h> 271da177e4SLinus Torvalds #include <asm/uaccess.h> 281da177e4SLinus Torvalds #include <asm/byteorder.h> 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds #include "usb.h" 311da177e4SLinus Torvalds #include "hcd.h" 321da177e4SLinus Torvalds #include "hub.h" 331da177e4SLinus Torvalds 3454515fe5SAlan Stern #ifdef CONFIG_USB_PERSIST 3554515fe5SAlan Stern #define USB_PERSIST 1 3654515fe5SAlan Stern #else 3754515fe5SAlan Stern #define USB_PERSIST 0 3854515fe5SAlan Stern #endif 3954515fe5SAlan Stern 401bb5f66bSAlan Stern struct usb_hub { 411bb5f66bSAlan Stern struct device *intfdev; /* the "interface" device */ 421bb5f66bSAlan Stern struct usb_device *hdev; 43e8054854SAlan Stern struct kref kref; 441bb5f66bSAlan Stern struct urb *urb; /* for interrupt polling pipe */ 451bb5f66bSAlan Stern 461bb5f66bSAlan Stern /* buffer for urb ... with extra space in case of babble */ 471bb5f66bSAlan Stern char (*buffer)[8]; 481bb5f66bSAlan Stern dma_addr_t buffer_dma; /* DMA address for buffer */ 491bb5f66bSAlan Stern union { 501bb5f66bSAlan Stern struct usb_hub_status hub; 511bb5f66bSAlan Stern struct usb_port_status port; 521bb5f66bSAlan Stern } *status; /* buffer for status reports */ 53db90e7a1SAlan Stern struct mutex status_mutex; /* for the status buffer */ 541bb5f66bSAlan Stern 551bb5f66bSAlan Stern int error; /* last reported error */ 561bb5f66bSAlan Stern int nerrors; /* track consecutive errors */ 571bb5f66bSAlan Stern 581bb5f66bSAlan Stern struct list_head event_list; /* hubs w/data or errs ready */ 591bb5f66bSAlan Stern unsigned long event_bits[1]; /* status change bitmask */ 601bb5f66bSAlan Stern unsigned long change_bits[1]; /* ports with logical connect 611bb5f66bSAlan Stern status change */ 621bb5f66bSAlan Stern unsigned long busy_bits[1]; /* ports being reset or 631bb5f66bSAlan Stern resumed */ 641bb5f66bSAlan Stern #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ 651bb5f66bSAlan Stern #error event_bits[] is too short! 661bb5f66bSAlan Stern #endif 671bb5f66bSAlan Stern 681bb5f66bSAlan Stern struct usb_hub_descriptor *descriptor; /* class descriptor */ 691bb5f66bSAlan Stern struct usb_tt tt; /* Transaction Translator */ 701bb5f66bSAlan Stern 711bb5f66bSAlan Stern unsigned mA_per_port; /* current for each child */ 721bb5f66bSAlan Stern 731bb5f66bSAlan Stern unsigned limited_power:1; 741bb5f66bSAlan Stern unsigned quiescing:1; 751bb5f66bSAlan Stern unsigned activating:1; 76e8054854SAlan Stern unsigned disconnected:1; 771bb5f66bSAlan Stern 781bb5f66bSAlan Stern unsigned has_indicators:1; 791bb5f66bSAlan Stern u8 indicator[USB_MAXCHILDREN]; 806d5aefb8SDavid Howells struct delayed_work leds; 811bb5f66bSAlan Stern }; 821bb5f66bSAlan Stern 831bb5f66bSAlan Stern 841da177e4SLinus Torvalds /* Protect struct usb_device->state and ->children members 859ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 861da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 871da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds /* khubd's worklist and its lock */ 901da177e4SLinus Torvalds static DEFINE_SPINLOCK(hub_event_lock); 911da177e4SLinus Torvalds static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds /* Wakes up khubd */ 941da177e4SLinus Torvalds static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); 951da177e4SLinus Torvalds 969c8d6178Sakpm@osdl.org static struct task_struct *khubd_task; 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 991da177e4SLinus Torvalds static int blinkenlights = 0; 1001da177e4SLinus Torvalds module_param (blinkenlights, bool, S_IRUGO); 1011da177e4SLinus Torvalds MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds /* 1041da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 1051da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 1061da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 1071da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 1081da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 1091da177e4SLinus Torvalds * following module parameters. 1101da177e4SLinus Torvalds * 1111da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 1121da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 1131da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 1141da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 1151da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 1161da177e4SLinus Torvalds */ 1171da177e4SLinus Torvalds static int old_scheme_first = 0; 1181da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 1191da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 1201da177e4SLinus Torvalds "start with the old device initialization scheme"); 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds static int use_both_schemes = 1; 1231da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 1241da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 1251da177e4SLinus Torvalds "try the other device initialization scheme if the " 1261da177e4SLinus Torvalds "first one fails"); 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds static inline char *portspeed(int portstatus) 1301da177e4SLinus Torvalds { 1311da177e4SLinus Torvalds if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) 1321da177e4SLinus Torvalds return "480 Mb/s"; 1331da177e4SLinus Torvalds else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) 1341da177e4SLinus Torvalds return "1.5 Mb/s"; 1351da177e4SLinus Torvalds else 1361da177e4SLinus Torvalds return "12 Mb/s"; 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 1401da177e4SLinus Torvalds static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev) 1411da177e4SLinus Torvalds { 1421da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1431da177e4SLinus Torvalds } 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 1461da177e4SLinus Torvalds static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) 1471da177e4SLinus Torvalds { 1481da177e4SLinus Torvalds int i, ret; 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 1511da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 1521da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 1531da177e4SLinus Torvalds USB_DT_HUB << 8, 0, data, size, 1541da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 1551da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 1561da177e4SLinus Torvalds return ret; 1571da177e4SLinus Torvalds } 1581da177e4SLinus Torvalds return -EINVAL; 1591da177e4SLinus Torvalds } 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds /* 1621da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 1631da177e4SLinus Torvalds */ 1641da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 1651da177e4SLinus Torvalds { 1661da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1671da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 1681da177e4SLinus Torvalds } 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds /* 1711da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 1721da177e4SLinus Torvalds */ 1731da177e4SLinus Torvalds static int clear_port_feature(struct usb_device *hdev, int port1, int feature) 1741da177e4SLinus Torvalds { 1751da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1761da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 1771da177e4SLinus Torvalds NULL, 0, 1000); 1781da177e4SLinus Torvalds } 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds /* 1811da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 1821da177e4SLinus Torvalds */ 1831da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 1841da177e4SLinus Torvalds { 1851da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1861da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 1871da177e4SLinus Torvalds NULL, 0, 1000); 1881da177e4SLinus Torvalds } 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds /* 1911da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 1921da177e4SLinus Torvalds * for info about using port indicators 1931da177e4SLinus Torvalds */ 1941da177e4SLinus Torvalds static void set_port_led( 1951da177e4SLinus Torvalds struct usb_hub *hub, 1961da177e4SLinus Torvalds int port1, 1971da177e4SLinus Torvalds int selector 1981da177e4SLinus Torvalds ) 1991da177e4SLinus Torvalds { 2001da177e4SLinus Torvalds int status = set_port_feature(hub->hdev, (selector << 8) | port1, 2011da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 2021da177e4SLinus Torvalds if (status < 0) 2031da177e4SLinus Torvalds dev_dbg (hub->intfdev, 2041da177e4SLinus Torvalds "port %d indicator %s status %d\n", 2051da177e4SLinus Torvalds port1, 2061da177e4SLinus Torvalds ({ char *s; switch (selector) { 2071da177e4SLinus Torvalds case HUB_LED_AMBER: s = "amber"; break; 2081da177e4SLinus Torvalds case HUB_LED_GREEN: s = "green"; break; 2091da177e4SLinus Torvalds case HUB_LED_OFF: s = "off"; break; 2101da177e4SLinus Torvalds case HUB_LED_AUTO: s = "auto"; break; 2111da177e4SLinus Torvalds default: s = "??"; break; 2121da177e4SLinus Torvalds }; s; }), 2131da177e4SLinus Torvalds status); 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 2171da177e4SLinus Torvalds 218c4028958SDavid Howells static void led_work (struct work_struct *work) 2191da177e4SLinus Torvalds { 220c4028958SDavid Howells struct usb_hub *hub = 221c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 2221da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 2231da177e4SLinus Torvalds unsigned i; 2241da177e4SLinus Torvalds unsigned changed = 0; 2251da177e4SLinus Torvalds int cursor = -1; 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 2281da177e4SLinus Torvalds return; 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds for (i = 0; i < hub->descriptor->bNbrPorts; i++) { 2311da177e4SLinus Torvalds unsigned selector, mode; 2321da177e4SLinus Torvalds 2331da177e4SLinus Torvalds /* 30%-50% duty cycle */ 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds switch (hub->indicator[i]) { 2361da177e4SLinus Torvalds /* cycle marker */ 2371da177e4SLinus Torvalds case INDICATOR_CYCLE: 2381da177e4SLinus Torvalds cursor = i; 2391da177e4SLinus Torvalds selector = HUB_LED_AUTO; 2401da177e4SLinus Torvalds mode = INDICATOR_AUTO; 2411da177e4SLinus Torvalds break; 2421da177e4SLinus Torvalds /* blinking green = sw attention */ 2431da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 2441da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2451da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 2461da177e4SLinus Torvalds break; 2471da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 2481da177e4SLinus Torvalds selector = HUB_LED_OFF; 2491da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 2501da177e4SLinus Torvalds break; 2511da177e4SLinus Torvalds /* blinking amber = hw attention */ 2521da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 2531da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2541da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 2551da177e4SLinus Torvalds break; 2561da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 2571da177e4SLinus Torvalds selector = HUB_LED_OFF; 2581da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 2591da177e4SLinus Torvalds break; 2601da177e4SLinus Torvalds /* blink green/amber = reserved */ 2611da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 2621da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2631da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 2641da177e4SLinus Torvalds break; 2651da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 2661da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2671da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 2681da177e4SLinus Torvalds break; 2691da177e4SLinus Torvalds default: 2701da177e4SLinus Torvalds continue; 2711da177e4SLinus Torvalds } 2721da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 2731da177e4SLinus Torvalds changed = 1; 2741da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 2751da177e4SLinus Torvalds hub->indicator[i] = mode; 2761da177e4SLinus Torvalds } 2771da177e4SLinus Torvalds if (!changed && blinkenlights) { 2781da177e4SLinus Torvalds cursor++; 2791da177e4SLinus Torvalds cursor %= hub->descriptor->bNbrPorts; 2801da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 2811da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 2821da177e4SLinus Torvalds changed++; 2831da177e4SLinus Torvalds } 2841da177e4SLinus Torvalds if (changed) 2851da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 2861da177e4SLinus Torvalds } 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 2891da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 2901da177e4SLinus Torvalds #define USB_STS_RETRIES 5 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds /* 2931da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 2941da177e4SLinus Torvalds */ 2951da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 2961da177e4SLinus Torvalds struct usb_hub_status *data) 2971da177e4SLinus Torvalds { 2981da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 2991da177e4SLinus Torvalds 3001da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 3011da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3021da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 3031da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 3041da177e4SLinus Torvalds } 3051da177e4SLinus Torvalds return status; 3061da177e4SLinus Torvalds } 3071da177e4SLinus Torvalds 3081da177e4SLinus Torvalds /* 3091da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 3101da177e4SLinus Torvalds */ 3111da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 3121da177e4SLinus Torvalds struct usb_port_status *data) 3131da177e4SLinus Torvalds { 3141da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 3171da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3181da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 3191da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 3201da177e4SLinus Torvalds } 3211da177e4SLinus Torvalds return status; 3221da177e4SLinus Torvalds } 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvalds static void kick_khubd(struct usb_hub *hub) 3251da177e4SLinus Torvalds { 3261da177e4SLinus Torvalds unsigned long flags; 3271da177e4SLinus Torvalds 32840f122f3SAlan Stern /* Suppress autosuspend until khubd runs */ 32940f122f3SAlan Stern to_usb_interface(hub->intfdev)->pm_usage_cnt = 1; 33040f122f3SAlan Stern 3311da177e4SLinus Torvalds spin_lock_irqsave(&hub_event_lock, flags); 332e8054854SAlan Stern if (!hub->disconnected & list_empty(&hub->event_list)) { 3331da177e4SLinus Torvalds list_add_tail(&hub->event_list, &hub_event_list); 3341da177e4SLinus Torvalds wake_up(&khubd_wait); 3351da177e4SLinus Torvalds } 3361da177e4SLinus Torvalds spin_unlock_irqrestore(&hub_event_lock, flags); 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds void usb_kick_khubd(struct usb_device *hdev) 3401da177e4SLinus Torvalds { 341e8054854SAlan Stern /* FIXME: What if hdev isn't bound to the hub driver? */ 3421da177e4SLinus Torvalds kick_khubd(hdev_to_hub(hdev)); 3431da177e4SLinus Torvalds } 3441da177e4SLinus Torvalds 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 3477d12e780SDavid Howells static void hub_irq(struct urb *urb) 3481da177e4SLinus Torvalds { 349ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 3501da177e4SLinus Torvalds int status; 3511da177e4SLinus Torvalds int i; 3521da177e4SLinus Torvalds unsigned long bits; 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds switch (urb->status) { 3551da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 3561da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 3571da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 3581da177e4SLinus Torvalds return; 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds default: /* presumably an error */ 3611da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 3621da177e4SLinus Torvalds dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status); 3631da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 3641da177e4SLinus Torvalds goto resubmit; 3651da177e4SLinus Torvalds hub->error = urb->status; 3661da177e4SLinus Torvalds /* FALL THROUGH */ 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds /* let khubd handle things */ 3691da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 3701da177e4SLinus Torvalds bits = 0; 3711da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 3721da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 3731da177e4SLinus Torvalds << (i*8); 3741da177e4SLinus Torvalds hub->event_bits[0] = bits; 3751da177e4SLinus Torvalds break; 3761da177e4SLinus Torvalds } 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds hub->nerrors = 0; 3791da177e4SLinus Torvalds 3801da177e4SLinus Torvalds /* Something happened, let khubd figure it out */ 3811da177e4SLinus Torvalds kick_khubd(hub); 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds resubmit: 3841da177e4SLinus Torvalds if (hub->quiescing) 3851da177e4SLinus Torvalds return; 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 3881da177e4SLinus Torvalds && status != -ENODEV && status != -EPERM) 3891da177e4SLinus Torvalds dev_err (hub->intfdev, "resubmit --> %d\n", status); 3901da177e4SLinus Torvalds } 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 3931da177e4SLinus Torvalds static inline int 3941da177e4SLinus Torvalds hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) 3951da177e4SLinus Torvalds { 3961da177e4SLinus Torvalds return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3971da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 3981da177e4SLinus Torvalds tt, NULL, 0, 1000); 3991da177e4SLinus Torvalds } 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds /* 4021da177e4SLinus Torvalds * enumeration blocks khubd for a long time. we use keventd instead, since 4031da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 4041da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 4051da177e4SLinus Torvalds * both can talk to the same hub concurrently. 4061da177e4SLinus Torvalds */ 407c4028958SDavid Howells static void hub_tt_kevent (struct work_struct *work) 4081da177e4SLinus Torvalds { 409c4028958SDavid Howells struct usb_hub *hub = 410c4028958SDavid Howells container_of(work, struct usb_hub, tt.kevent); 4111da177e4SLinus Torvalds unsigned long flags; 41255e5fdfaSMark Lord int limit = 100; 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 41555e5fdfaSMark Lord while (--limit && !list_empty (&hub->tt.clear_list)) { 4161da177e4SLinus Torvalds struct list_head *temp; 4171da177e4SLinus Torvalds struct usb_tt_clear *clear; 4181da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4191da177e4SLinus Torvalds int status; 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvalds temp = hub->tt.clear_list.next; 4221da177e4SLinus Torvalds clear = list_entry (temp, struct usb_tt_clear, clear_list); 4231da177e4SLinus Torvalds list_del (&clear->clear_list); 4241da177e4SLinus Torvalds 4251da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 4261da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 4271da177e4SLinus Torvalds status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 4281da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds if (status) 4311da177e4SLinus Torvalds dev_err (&hdev->dev, 4321da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 4331da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 4341da177e4SLinus Torvalds kfree(clear); 4351da177e4SLinus Torvalds } 4361da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 4371da177e4SLinus Torvalds } 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds /** 4401da177e4SLinus Torvalds * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub 4411da177e4SLinus Torvalds * @udev: the device whose split transaction failed 4421da177e4SLinus Torvalds * @pipe: identifies the endpoint of the failed transaction 4431da177e4SLinus Torvalds * 4441da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 4451da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 4461da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 4471da177e4SLinus Torvalds * interrupt context. 4481da177e4SLinus Torvalds * 4491da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 4501da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 4511da177e4SLinus Torvalds */ 4521da177e4SLinus Torvalds void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe) 4531da177e4SLinus Torvalds { 4541da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 4551da177e4SLinus Torvalds unsigned long flags; 4561da177e4SLinus Torvalds struct usb_tt_clear *clear; 4571da177e4SLinus Torvalds 4581da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 4591da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 4601da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 4611da177e4SLinus Torvalds */ 46254e6ecb2SChristoph Lameter if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { 4631da177e4SLinus Torvalds dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 4641da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 4651da177e4SLinus Torvalds return; 4661da177e4SLinus Torvalds } 4671da177e4SLinus Torvalds 4681da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 4691da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 4701da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 4711da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 4721da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol (pipe) 4731da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 4741da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 4751da177e4SLinus Torvalds if (usb_pipein (pipe)) 4761da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 4791da177e4SLinus Torvalds spin_lock_irqsave (&tt->lock, flags); 4801da177e4SLinus Torvalds list_add_tail (&clear->clear_list, &tt->clear_list); 4811da177e4SLinus Torvalds schedule_work (&tt->kevent); 4821da177e4SLinus Torvalds spin_unlock_irqrestore (&tt->lock, flags); 4831da177e4SLinus Torvalds } 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds static void hub_power_on(struct usb_hub *hub) 4861da177e4SLinus Torvalds { 4871da177e4SLinus Torvalds int port1; 488b789696aSDavid Brownell unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 4894489a571SAlan Stern u16 wHubCharacteristics = 4904489a571SAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 4911da177e4SLinus Torvalds 4924489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 4934489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 4944489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 4954489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 4964489a571SAlan Stern * unless we send these messages to the hub. 4974489a571SAlan Stern */ 4984489a571SAlan Stern if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) 4991da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 5004489a571SAlan Stern else 5014489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 5024489a571SAlan Stern "non-switchable hub\n"); 5031da177e4SLinus Torvalds for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) 5044489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 5051da177e4SLinus Torvalds 506b789696aSDavid Brownell /* Wait at least 100 msec for power to become stable */ 507b789696aSDavid Brownell msleep(max(pgood_delay, (unsigned) 100)); 5081da177e4SLinus Torvalds } 5091da177e4SLinus Torvalds 51002c399eeSAlan Stern static void hub_quiesce(struct usb_hub *hub) 5111da177e4SLinus Torvalds { 512979d5199SDavid Brownell /* (nonblocking) khubd and related activity won't re-trigger */ 5131da177e4SLinus Torvalds hub->quiescing = 1; 514c9f89fa4SDavid Brownell hub->activating = 0; 515979d5199SDavid Brownell 516979d5199SDavid Brownell /* (blocking) stop khubd and related activity */ 5171da177e4SLinus Torvalds usb_kill_urb(hub->urb); 5181da177e4SLinus Torvalds if (hub->has_indicators) 5191da177e4SLinus Torvalds cancel_delayed_work(&hub->leds); 5201da177e4SLinus Torvalds if (hub->has_indicators || hub->tt.hub) 5211da177e4SLinus Torvalds flush_scheduled_work(); 5221da177e4SLinus Torvalds } 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds static void hub_activate(struct usb_hub *hub) 5251da177e4SLinus Torvalds { 5261da177e4SLinus Torvalds int status; 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds hub->quiescing = 0; 5291da177e4SLinus Torvalds hub->activating = 1; 53040f122f3SAlan Stern 5311da177e4SLinus Torvalds status = usb_submit_urb(hub->urb, GFP_NOIO); 5321da177e4SLinus Torvalds if (status < 0) 5331da177e4SLinus Torvalds dev_err(hub->intfdev, "activate --> %d\n", status); 5341da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 5351da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 5361da177e4SLinus Torvalds 5371da177e4SLinus Torvalds /* scan all ports ASAP */ 5381da177e4SLinus Torvalds kick_khubd(hub); 5391da177e4SLinus Torvalds } 5401da177e4SLinus Torvalds 5411da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 5421da177e4SLinus Torvalds u16 *status, u16 *change) 5431da177e4SLinus Torvalds { 5441da177e4SLinus Torvalds int ret; 5451da177e4SLinus Torvalds 546db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 5471da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 5481da177e4SLinus Torvalds if (ret < 0) 5491da177e4SLinus Torvalds dev_err (hub->intfdev, 5501da177e4SLinus Torvalds "%s failed (err = %d)\n", __FUNCTION__, ret); 5511da177e4SLinus Torvalds else { 5521da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 5531da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 5541da177e4SLinus Torvalds ret = 0; 5551da177e4SLinus Torvalds } 556db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 5571da177e4SLinus Torvalds return ret; 5581da177e4SLinus Torvalds } 5591da177e4SLinus Torvalds 5608b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 5618b28c752SAlan Stern { 5628b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 5630458d5b4SAlan Stern int ret = 0; 5648b28c752SAlan Stern 5650458d5b4SAlan Stern if (hdev->children[port1-1] && set_state) 5668b28c752SAlan Stern usb_set_device_state(hdev->children[port1-1], 5678b28c752SAlan Stern USB_STATE_NOTATTACHED); 5680458d5b4SAlan Stern if (!hub->error) 5698b28c752SAlan Stern ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); 5708b28c752SAlan Stern if (ret) 5718b28c752SAlan Stern dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 5728b28c752SAlan Stern port1, ret); 5738b28c752SAlan Stern return ret; 5748b28c752SAlan Stern } 5758b28c752SAlan Stern 5760458d5b4SAlan Stern /* 5770458d5b4SAlan Stern * Disable a port and mark a logical connnect-change event, so that some 5780458d5b4SAlan Stern * time later khubd will disconnect() any existing usb_device on the port 5790458d5b4SAlan Stern * and will re-enumerate if there actually is a device attached. 5800458d5b4SAlan Stern */ 5810458d5b4SAlan Stern static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 5827d069b7dSAlan Stern { 5830458d5b4SAlan Stern dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 5840458d5b4SAlan Stern hub_port_disable(hub, port1, 1); 5850458d5b4SAlan Stern 5860458d5b4SAlan Stern /* FIXME let caller ask to power down the port: 5870458d5b4SAlan Stern * - some devices won't enumerate without a VBUS power cycle 5880458d5b4SAlan Stern * - SRP saves power that way 5890458d5b4SAlan Stern * - ... new call, TBD ... 5900458d5b4SAlan Stern * That's easy if this hub can switch power per-port, and 5910458d5b4SAlan Stern * khubd reactivates the port later (timer, SRP, etc). 5920458d5b4SAlan Stern * Powerdown must be optional, because of reset/DFU. 5930458d5b4SAlan Stern */ 5940458d5b4SAlan Stern 5950458d5b4SAlan Stern set_bit(port1, hub->change_bits); 5960458d5b4SAlan Stern kick_khubd(hub); 5970458d5b4SAlan Stern } 5980458d5b4SAlan Stern 5990458d5b4SAlan Stern /* caller has locked the hub device */ 600f07600cfSAlan Stern static int hub_pre_reset(struct usb_interface *intf) 6010458d5b4SAlan Stern { 6020458d5b4SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 603b41a60ecSAlan Stern struct usb_device *hdev = hub->hdev; 604b41a60ecSAlan Stern int i; 6050458d5b4SAlan Stern 606b41a60ecSAlan Stern /* Disconnect all the children */ 607b41a60ecSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 608b41a60ecSAlan Stern if (hdev->children[i]) 609b41a60ecSAlan Stern usb_disconnect(&hdev->children[i]); 610b41a60ecSAlan Stern } 6117d069b7dSAlan Stern hub_quiesce(hub); 612f07600cfSAlan Stern return 0; 6137d069b7dSAlan Stern } 6147d069b7dSAlan Stern 6157d069b7dSAlan Stern /* caller has locked the hub device */ 616f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 6177d069b7dSAlan Stern { 6187de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 6197de18d8bSAlan Stern 6207d069b7dSAlan Stern hub_power_on(hub); 6210458d5b4SAlan Stern hub_activate(hub); 622f07600cfSAlan Stern return 0; 6237d069b7dSAlan Stern } 6247d069b7dSAlan Stern 6251da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 6261da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 6271da177e4SLinus Torvalds { 6281da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 6291da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 6301da177e4SLinus Torvalds u16 hubstatus, hubchange; 63174ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 6321da177e4SLinus Torvalds unsigned int pipe; 6331da177e4SLinus Torvalds int maxp, ret; 6341da177e4SLinus Torvalds char *message; 6351da177e4SLinus Torvalds 6361da177e4SLinus Torvalds hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL, 6371da177e4SLinus Torvalds &hub->buffer_dma); 6381da177e4SLinus Torvalds if (!hub->buffer) { 6391da177e4SLinus Torvalds message = "can't allocate hub irq buffer"; 6401da177e4SLinus Torvalds ret = -ENOMEM; 6411da177e4SLinus Torvalds goto fail; 6421da177e4SLinus Torvalds } 6431da177e4SLinus Torvalds 6441da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 6451da177e4SLinus Torvalds if (!hub->status) { 6461da177e4SLinus Torvalds message = "can't kmalloc hub status buffer"; 6471da177e4SLinus Torvalds ret = -ENOMEM; 6481da177e4SLinus Torvalds goto fail; 6491da177e4SLinus Torvalds } 650db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 6511da177e4SLinus Torvalds 6521da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 6531da177e4SLinus Torvalds if (!hub->descriptor) { 6541da177e4SLinus Torvalds message = "can't kmalloc hub descriptor"; 6551da177e4SLinus Torvalds ret = -ENOMEM; 6561da177e4SLinus Torvalds goto fail; 6571da177e4SLinus Torvalds } 6581da177e4SLinus Torvalds 6591da177e4SLinus Torvalds /* Request the entire hub descriptor. 6601da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 6611da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 6621da177e4SLinus Torvalds */ 6631da177e4SLinus Torvalds ret = get_hub_descriptor(hdev, hub->descriptor, 6641da177e4SLinus Torvalds sizeof(*hub->descriptor)); 6651da177e4SLinus Torvalds if (ret < 0) { 6661da177e4SLinus Torvalds message = "can't read hub descriptor"; 6671da177e4SLinus Torvalds goto fail; 6681da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 6691da177e4SLinus Torvalds message = "hub has too many ports!"; 6701da177e4SLinus Torvalds ret = -ENODEV; 6711da177e4SLinus Torvalds goto fail; 6721da177e4SLinus Torvalds } 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 6751da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 6761da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 6771da177e4SLinus Torvalds 67874ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 6791da177e4SLinus Torvalds 68074ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_COMPOUND) { 6811da177e4SLinus Torvalds int i; 6821da177e4SLinus Torvalds char portstr [USB_MAXCHILDREN + 1]; 6831da177e4SLinus Torvalds 6841da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 6851da177e4SLinus Torvalds portstr[i] = hub->descriptor->DeviceRemovable 6861da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 6871da177e4SLinus Torvalds ? 'F' : 'R'; 6881da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 6891da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 6901da177e4SLinus Torvalds } else 6911da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 6921da177e4SLinus Torvalds 69374ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 6941da177e4SLinus Torvalds case 0x00: 6951da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 6961da177e4SLinus Torvalds break; 6971da177e4SLinus Torvalds case 0x01: 6981da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 6991da177e4SLinus Torvalds break; 7001da177e4SLinus Torvalds case 0x02: 7011da177e4SLinus Torvalds case 0x03: 7021da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 7031da177e4SLinus Torvalds break; 7041da177e4SLinus Torvalds } 7051da177e4SLinus Torvalds 70674ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 7071da177e4SLinus Torvalds case 0x00: 7081da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 7091da177e4SLinus Torvalds break; 7101da177e4SLinus Torvalds case 0x08: 7111da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 7121da177e4SLinus Torvalds break; 7131da177e4SLinus Torvalds case 0x10: 7141da177e4SLinus Torvalds case 0x18: 7151da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 7161da177e4SLinus Torvalds break; 7171da177e4SLinus Torvalds } 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 7201da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 721c4028958SDavid Howells INIT_WORK (&hub->tt.kevent, hub_tt_kevent); 7221da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 7231da177e4SLinus Torvalds case 0: 7241da177e4SLinus Torvalds break; 7251da177e4SLinus Torvalds case 1: 7261da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 7271da177e4SLinus Torvalds hub->tt.hub = hdev; 7281da177e4SLinus Torvalds break; 7291da177e4SLinus Torvalds case 2: 7301da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 7311da177e4SLinus Torvalds if (ret == 0) { 7321da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 7331da177e4SLinus Torvalds hub->tt.multi = 1; 7341da177e4SLinus Torvalds } else 7351da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 7361da177e4SLinus Torvalds ret); 7371da177e4SLinus Torvalds hub->tt.hub = hdev; 7381da177e4SLinus Torvalds break; 7391da177e4SLinus Torvalds default: 7401da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 7411da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 7421da177e4SLinus Torvalds break; 7431da177e4SLinus Torvalds } 7441da177e4SLinus Torvalds 745e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 74674ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 747e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 748e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 749e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 750e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 751e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 752e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 753e09711aeSdavid-b@pacbell.net } 7541da177e4SLinus Torvalds break; 755e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 756e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 757e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 758e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 759e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 7601da177e4SLinus Torvalds break; 761e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 762e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 763e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 764e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 765e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 7661da177e4SLinus Torvalds break; 767e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 768e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 769e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 770e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 771e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 7721da177e4SLinus Torvalds break; 7731da177e4SLinus Torvalds } 7741da177e4SLinus Torvalds 7751da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 77674ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 7771da177e4SLinus Torvalds hub->has_indicators = 1; 7781da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 7791da177e4SLinus Torvalds } 7801da177e4SLinus Torvalds 7811da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 7821da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 7831da177e4SLinus Torvalds 7841da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 7851da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 7861da177e4SLinus Torvalds */ 7871da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 78855c52718SAlan Stern if (ret < 2) { 7891da177e4SLinus Torvalds message = "can't get hub status"; 7901da177e4SLinus Torvalds goto fail; 7911da177e4SLinus Torvalds } 7927d35b929SAlan Stern le16_to_cpus(&hubstatus); 7937d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 79455c52718SAlan Stern if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) 79555c52718SAlan Stern hub->mA_per_port = 500; 79655c52718SAlan Stern else { 79755c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 79855c52718SAlan Stern hub->limited_power = 1; 79955c52718SAlan Stern } 8007d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 8011da177e4SLinus Torvalds dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 8021da177e4SLinus Torvalds hub->descriptor->bHubContrCurrent); 80355c52718SAlan Stern hub->limited_power = 1; 80455c52718SAlan Stern if (hdev->maxchild > 0) { 80555c52718SAlan Stern int remaining = hdev->bus_mA - 80655c52718SAlan Stern hub->descriptor->bHubContrCurrent; 8071da177e4SLinus Torvalds 80855c52718SAlan Stern if (remaining < hdev->maxchild * 100) 80955c52718SAlan Stern dev_warn(hub_dev, 81055c52718SAlan Stern "insufficient power available " 81155c52718SAlan Stern "to use all downstream ports\n"); 81255c52718SAlan Stern hub->mA_per_port = 100; /* 7.2.1.1 */ 81355c52718SAlan Stern } 81455c52718SAlan Stern } else { /* Self-powered external hub */ 81555c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 81655c52718SAlan Stern * provide less current per port? */ 81755c52718SAlan Stern hub->mA_per_port = 500; 81855c52718SAlan Stern } 81955c52718SAlan Stern if (hub->mA_per_port < 500) 82055c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 82155c52718SAlan Stern hub->mA_per_port); 8221da177e4SLinus Torvalds 8231da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 8241da177e4SLinus Torvalds if (ret < 0) { 8251da177e4SLinus Torvalds message = "can't get hub status"; 8261da177e4SLinus Torvalds goto fail; 8271da177e4SLinus Torvalds } 8281da177e4SLinus Torvalds 8291da177e4SLinus Torvalds /* local power status reports aren't always correct */ 8301da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 8311da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 8321da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 8331da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 8341da177e4SLinus Torvalds 83574ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 8361da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 8371da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 8381da177e4SLinus Torvalds 83988fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 84088fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 84188fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 84288fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 84388fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 84488fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 8451da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 8461da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 8471da177e4SLinus Torvalds 8481da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 8491da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 8501da177e4SLinus Torvalds 8511da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 8521da177e4SLinus Torvalds if (!hub->urb) { 8531da177e4SLinus Torvalds message = "couldn't allocate interrupt urb"; 8541da177e4SLinus Torvalds ret = -ENOMEM; 8551da177e4SLinus Torvalds goto fail; 8561da177e4SLinus Torvalds } 8571da177e4SLinus Torvalds 8581da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 8591da177e4SLinus Torvalds hub, endpoint->bInterval); 8601da177e4SLinus Torvalds hub->urb->transfer_dma = hub->buffer_dma; 8611da177e4SLinus Torvalds hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 8621da177e4SLinus Torvalds 8631da177e4SLinus Torvalds /* maybe cycle the hub leds */ 8641da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 8651da177e4SLinus Torvalds hub->indicator [0] = INDICATOR_CYCLE; 8661da177e4SLinus Torvalds 8671da177e4SLinus Torvalds hub_power_on(hub); 8681da177e4SLinus Torvalds hub_activate(hub); 8691da177e4SLinus Torvalds return 0; 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds fail: 8721da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 8731da177e4SLinus Torvalds message, ret); 8741da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 8751da177e4SLinus Torvalds return ret; 8761da177e4SLinus Torvalds } 8771da177e4SLinus Torvalds 878e8054854SAlan Stern static void hub_release(struct kref *kref) 879e8054854SAlan Stern { 880e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 881e8054854SAlan Stern 882e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 883e8054854SAlan Stern kfree(hub); 884e8054854SAlan Stern } 885e8054854SAlan Stern 8861da177e4SLinus Torvalds static unsigned highspeed_hubs; 8871da177e4SLinus Torvalds 8881da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 8891da177e4SLinus Torvalds { 8901da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 891e8054854SAlan Stern 892e8054854SAlan Stern /* Take the hub off the event list and don't let it be added again */ 893e8054854SAlan Stern spin_lock_irq(&hub_event_lock); 894e8054854SAlan Stern list_del_init(&hub->event_list); 895e8054854SAlan Stern hub->disconnected = 1; 896e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 8971da177e4SLinus Torvalds 8987de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 8997de18d8bSAlan Stern hub->error = 0; 9007de18d8bSAlan Stern hub_pre_reset(intf); 9017de18d8bSAlan Stern 9028b28c752SAlan Stern usb_set_intfdata (intf, NULL); 9031da177e4SLinus Torvalds 904e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 9051da177e4SLinus Torvalds highspeed_hubs--; 9061da177e4SLinus Torvalds 9071da177e4SLinus Torvalds usb_free_urb(hub->urb); 9081da177e4SLinus Torvalds kfree(hub->descriptor); 9091da177e4SLinus Torvalds kfree(hub->status); 910e8054854SAlan Stern usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer, 9111da177e4SLinus Torvalds hub->buffer_dma); 9121da177e4SLinus Torvalds 913e8054854SAlan Stern kref_put(&hub->kref, hub_release); 9141da177e4SLinus Torvalds } 9151da177e4SLinus Torvalds 9161da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 9171da177e4SLinus Torvalds { 9181da177e4SLinus Torvalds struct usb_host_interface *desc; 9191da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 9201da177e4SLinus Torvalds struct usb_device *hdev; 9211da177e4SLinus Torvalds struct usb_hub *hub; 9221da177e4SLinus Torvalds 9231da177e4SLinus Torvalds desc = intf->cur_altsetting; 9241da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 9251da177e4SLinus Torvalds 92689ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 92789ccbdc9SDavid Brownell if (hdev->parent) { 92889ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 92989ccbdc9SDavid Brownell return -ENODEV; 93089ccbdc9SDavid Brownell } 93189ccbdc9SDavid Brownell #endif 93289ccbdc9SDavid Brownell 9331da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 9341da177e4SLinus Torvalds /* specs is not defined, but it works */ 9351da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 9361da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 9371da177e4SLinus Torvalds descriptor_error: 9381da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 9391da177e4SLinus Torvalds return -EIO; 9401da177e4SLinus Torvalds } 9411da177e4SLinus Torvalds 9421da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 9431da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 9441da177e4SLinus Torvalds goto descriptor_error; 9451da177e4SLinus Torvalds 9461da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 9471da177e4SLinus Torvalds 948fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 949fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 9501da177e4SLinus Torvalds goto descriptor_error; 9511da177e4SLinus Torvalds 9521da177e4SLinus Torvalds /* We found a hub */ 9531da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 9541da177e4SLinus Torvalds 9550a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 9561da177e4SLinus Torvalds if (!hub) { 9571da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 9581da177e4SLinus Torvalds return -ENOMEM; 9591da177e4SLinus Torvalds } 9601da177e4SLinus Torvalds 961e8054854SAlan Stern kref_init(&hub->kref); 9621da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 9631da177e4SLinus Torvalds hub->intfdev = &intf->dev; 9641da177e4SLinus Torvalds hub->hdev = hdev; 965c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 966e8054854SAlan Stern usb_get_intf(intf); 9671da177e4SLinus Torvalds 9681da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 96940f122f3SAlan Stern intf->needs_remote_wakeup = 1; 9701da177e4SLinus Torvalds 9711da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 9721da177e4SLinus Torvalds highspeed_hubs++; 9731da177e4SLinus Torvalds 9741da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 9751da177e4SLinus Torvalds return 0; 9761da177e4SLinus Torvalds 9771da177e4SLinus Torvalds hub_disconnect (intf); 9781da177e4SLinus Torvalds return -ENODEV; 9791da177e4SLinus Torvalds } 9801da177e4SLinus Torvalds 9811da177e4SLinus Torvalds static int 9821da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 9831da177e4SLinus Torvalds { 9841da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 9851da177e4SLinus Torvalds 9861da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 9871da177e4SLinus Torvalds switch (code) { 9881da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 9891da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 9901da177e4SLinus Torvalds int i; 9911da177e4SLinus Torvalds 9921da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 9931da177e4SLinus Torvalds if (hdev->devnum <= 0) 9941da177e4SLinus Torvalds info->nports = 0; 9951da177e4SLinus Torvalds else { 9961da177e4SLinus Torvalds info->nports = hdev->maxchild; 9971da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 9981da177e4SLinus Torvalds if (hdev->children[i] == NULL) 9991da177e4SLinus Torvalds info->port[i] = 0; 10001da177e4SLinus Torvalds else 10011da177e4SLinus Torvalds info->port[i] = 10021da177e4SLinus Torvalds hdev->children[i]->devnum; 10031da177e4SLinus Torvalds } 10041da177e4SLinus Torvalds } 10051da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 10061da177e4SLinus Torvalds 10071da177e4SLinus Torvalds return info->nports + 1; 10081da177e4SLinus Torvalds } 10091da177e4SLinus Torvalds 10101da177e4SLinus Torvalds default: 10111da177e4SLinus Torvalds return -ENOSYS; 10121da177e4SLinus Torvalds } 10131da177e4SLinus Torvalds } 10141da177e4SLinus Torvalds 10151da177e4SLinus Torvalds 10161da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 10171da177e4SLinus Torvalds { 10181da177e4SLinus Torvalds int i; 10191da177e4SLinus Torvalds 10201da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 10211da177e4SLinus Torvalds if (udev->children[i]) 10221da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev->children[i]); 10231da177e4SLinus Torvalds } 1024ee49fb5dSAlan Stern if (udev->state == USB_STATE_SUSPENDED) 1025ee49fb5dSAlan Stern udev->discon_suspended = 1; 10261da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 10271da177e4SLinus Torvalds } 10281da177e4SLinus Torvalds 10291da177e4SLinus Torvalds /** 10301da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 10311da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 10321da177e4SLinus Torvalds * @new_state: new state value to be stored 10331da177e4SLinus Torvalds * 10341da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 10351da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 10361da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 10371da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 10381da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 10391da177e4SLinus Torvalds * all changes to any device's state must be protected by the 10401da177e4SLinus Torvalds * device_state_lock spinlock. 10411da177e4SLinus Torvalds * 10421da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 10431da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 10441da177e4SLinus Torvalds * 10451da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 10461da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 10471da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 10481da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 10491da177e4SLinus Torvalds */ 10501da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 10511da177e4SLinus Torvalds enum usb_device_state new_state) 10521da177e4SLinus Torvalds { 10531da177e4SLinus Torvalds unsigned long flags; 10541da177e4SLinus Torvalds 10551da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 10561da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 10571da177e4SLinus Torvalds ; /* do nothing */ 1058b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1059fb669cc0SDavid Brownell 1060fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1061fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1062fb669cc0SDavid Brownell */ 1063fb669cc0SDavid Brownell if (udev->parent) { 1064645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1065645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1066645daaabSAlan Stern ; /* No change to wakeup settings */ 1067645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 1068b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 1069b94dc6b5SDavid Brownell (udev->actconfig->desc.bmAttributes 1070b94dc6b5SDavid Brownell & USB_CONFIG_ATT_WAKEUP)); 1071645daaabSAlan Stern else 1072b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 0); 1073fb669cc0SDavid Brownell } 1074645daaabSAlan Stern udev->state = new_state; 1075b94dc6b5SDavid Brownell } else 10761da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 10771da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 10781da177e4SLinus Torvalds } 10791da177e4SLinus Torvalds 10801da177e4SLinus Torvalds static void choose_address(struct usb_device *udev) 10811da177e4SLinus Torvalds { 10821da177e4SLinus Torvalds int devnum; 10831da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 10841da177e4SLinus Torvalds 10851da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 10861da177e4SLinus Torvalds 10871da177e4SLinus Torvalds /* Try to allocate the next devnum beginning at bus->devnum_next. */ 10881da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 10891da177e4SLinus Torvalds bus->devnum_next); 10901da177e4SLinus Torvalds if (devnum >= 128) 10911da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1); 10921da177e4SLinus Torvalds 10931da177e4SLinus Torvalds bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); 10941da177e4SLinus Torvalds 10951da177e4SLinus Torvalds if (devnum < 128) { 10961da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 10971da177e4SLinus Torvalds udev->devnum = devnum; 10981da177e4SLinus Torvalds } 10991da177e4SLinus Torvalds } 11001da177e4SLinus Torvalds 11011da177e4SLinus Torvalds static void release_address(struct usb_device *udev) 11021da177e4SLinus Torvalds { 11031da177e4SLinus Torvalds if (udev->devnum > 0) { 11041da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 11051da177e4SLinus Torvalds udev->devnum = -1; 11061da177e4SLinus Torvalds } 11071da177e4SLinus Torvalds } 11081da177e4SLinus Torvalds 1109d5d4db70SAlan Stern #ifdef CONFIG_USB_SUSPEND 1110d5d4db70SAlan Stern 1111d5d4db70SAlan Stern static void usb_stop_pm(struct usb_device *udev) 1112d5d4db70SAlan Stern { 1113d5d4db70SAlan Stern /* Synchronize with the ksuspend thread to prevent any more 1114d5d4db70SAlan Stern * autosuspend requests from being submitted, and decrement 1115d5d4db70SAlan Stern * the parent's count of unsuspended children. 1116d5d4db70SAlan Stern */ 1117d5d4db70SAlan Stern usb_pm_lock(udev); 1118d5d4db70SAlan Stern if (udev->parent && !udev->discon_suspended) 1119d5d4db70SAlan Stern usb_autosuspend_device(udev->parent); 1120d5d4db70SAlan Stern usb_pm_unlock(udev); 1121d5d4db70SAlan Stern 1122d5d4db70SAlan Stern /* Stop any autosuspend requests already submitted */ 1123d5d4db70SAlan Stern cancel_rearming_delayed_work(&udev->autosuspend); 1124d5d4db70SAlan Stern } 1125d5d4db70SAlan Stern 1126d5d4db70SAlan Stern #else 1127d5d4db70SAlan Stern 1128d5d4db70SAlan Stern static inline void usb_stop_pm(struct usb_device *udev) 1129d5d4db70SAlan Stern { } 1130d5d4db70SAlan Stern 1131d5d4db70SAlan Stern #endif 1132d5d4db70SAlan Stern 11331da177e4SLinus Torvalds /** 11341da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 11351da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 11361da177e4SLinus Torvalds * Context: !in_interrupt () 11371da177e4SLinus Torvalds * 11381da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 11391da177e4SLinus Torvalds * 11401da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 11411da177e4SLinus Torvalds * If *pdev is a root hub then this routine will acquire the 11421da177e4SLinus Torvalds * usb_bus_list_lock on behalf of the caller. 11431da177e4SLinus Torvalds * 11441da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 11451da177e4SLinus Torvalds * controllers) should ever call this. 11461da177e4SLinus Torvalds * 11471da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 11481da177e4SLinus Torvalds */ 11491da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 11501da177e4SLinus Torvalds { 11511da177e4SLinus Torvalds struct usb_device *udev = *pdev; 11521da177e4SLinus Torvalds int i; 11531da177e4SLinus Torvalds 11541da177e4SLinus Torvalds if (!udev) { 11551da177e4SLinus Torvalds pr_debug ("%s nodev\n", __FUNCTION__); 11561da177e4SLinus Torvalds return; 11571da177e4SLinus Torvalds } 11581da177e4SLinus Torvalds 11591da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 11601da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 11611da177e4SLinus Torvalds * this quiesces everyting except pending urbs. 11621da177e4SLinus Torvalds */ 11631da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 11641da177e4SLinus Torvalds dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); 11651da177e4SLinus Torvalds 11669ad3d6ccSAlan Stern usb_lock_device(udev); 11679ad3d6ccSAlan Stern 11681da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 11691da177e4SLinus Torvalds for (i = 0; i < USB_MAXCHILDREN; i++) { 11701da177e4SLinus Torvalds if (udev->children[i]) 11711da177e4SLinus Torvalds usb_disconnect(&udev->children[i]); 11721da177e4SLinus Torvalds } 11731da177e4SLinus Torvalds 11741da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 11751da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 11761da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 11771da177e4SLinus Torvalds */ 1178782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 11791da177e4SLinus Torvalds usb_disable_device(udev, 0); 11801da177e4SLinus Torvalds 1181782da727SAlan Stern usb_unlock_device(udev); 11823099e75aSGreg Kroah-Hartman 1183782da727SAlan Stern /* Unregister the device. The device driver is responsible 1184782da727SAlan Stern * for removing the device files from usbfs and sysfs and for 1185782da727SAlan Stern * de-configuring the device. 1186782da727SAlan Stern */ 1187782da727SAlan Stern device_del(&udev->dev); 1188782da727SAlan Stern 1189782da727SAlan Stern /* Free the device number and delete the parent's children[] 11901da177e4SLinus Torvalds * (or root_hub) pointer. 11911da177e4SLinus Torvalds */ 11921da177e4SLinus Torvalds release_address(udev); 11931da177e4SLinus Torvalds 11941da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 11951da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 11961da177e4SLinus Torvalds *pdev = NULL; 11971da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 11981da177e4SLinus Torvalds 1199d5d4db70SAlan Stern usb_stop_pm(udev); 1200ee49fb5dSAlan Stern 1201782da727SAlan Stern put_device(&udev->dev); 12021da177e4SLinus Torvalds } 12031da177e4SLinus Torvalds 12041da177e4SLinus Torvalds #ifdef DEBUG 12051da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 12061da177e4SLinus Torvalds { 12071da177e4SLinus Torvalds if (!string) 12081da177e4SLinus Torvalds return; 12091da177e4SLinus Torvalds dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); 12101da177e4SLinus Torvalds } 12111da177e4SLinus Torvalds 12121da177e4SLinus Torvalds #else 12131da177e4SLinus Torvalds static inline void show_string(struct usb_device *udev, char *id, char *string) 12141da177e4SLinus Torvalds {} 12151da177e4SLinus Torvalds #endif 12161da177e4SLinus Torvalds 12171da177e4SLinus Torvalds 12181da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 12191da177e4SLinus Torvalds #include "otg_whitelist.h" 12201da177e4SLinus Torvalds #endif 12211da177e4SLinus Torvalds 12223ede760fSOliver Neukum /** 12233ede760fSOliver Neukum * usb_new_device - perform initial device setup (usbcore-internal) 12243ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 12253ede760fSOliver Neukum * 12263ede760fSOliver Neukum * This is called with devices which have been enumerated, but not yet 12273ede760fSOliver Neukum * configured. The device descriptor is available, but not descriptors 12283ede760fSOliver Neukum * for any device configuration. The caller must have locked either 12293ede760fSOliver Neukum * the parent hub (if udev is a normal device) or else the 12303ede760fSOliver Neukum * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 12313ede760fSOliver Neukum * udev has already been installed, but udev is not yet visible through 12323ede760fSOliver Neukum * sysfs or other filesystem code. 12333ede760fSOliver Neukum * 12343ede760fSOliver Neukum * It will return if the device is configured properly or not. Zero if 12353ede760fSOliver Neukum * the interface was registered with the driver core; else a negative 12363ede760fSOliver Neukum * errno value. 12373ede760fSOliver Neukum * 12383ede760fSOliver Neukum * This call is synchronous, and may not be used in an interrupt context. 12393ede760fSOliver Neukum * 12403ede760fSOliver Neukum * Only the hub driver or root-hub registrar should ever call this. 12413ede760fSOliver Neukum */ 12423ede760fSOliver Neukum int usb_new_device(struct usb_device *udev) 12431da177e4SLinus Torvalds { 12441da177e4SLinus Torvalds int err; 12451da177e4SLinus Torvalds 12467ceec1f1SOliver Neukum /* Determine quirks */ 12477ceec1f1SOliver Neukum usb_detect_quirks(udev); 12487ceec1f1SOliver Neukum 12491da177e4SLinus Torvalds err = usb_get_configuration(udev); 12501da177e4SLinus Torvalds if (err < 0) { 12511da177e4SLinus Torvalds dev_err(&udev->dev, "can't read configurations, error %d\n", 12521da177e4SLinus Torvalds err); 12531da177e4SLinus Torvalds goto fail; 12541da177e4SLinus Torvalds } 12551da177e4SLinus Torvalds 12561da177e4SLinus Torvalds /* read the standard strings and cache them if present */ 12574f62efe6SAlan Stern udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 12584f62efe6SAlan Stern udev->manufacturer = usb_cache_string(udev, 12594f62efe6SAlan Stern udev->descriptor.iManufacturer); 12604f62efe6SAlan Stern udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 12611da177e4SLinus Torvalds 12621da177e4SLinus Torvalds /* Tell the world! */ 12631da177e4SLinus Torvalds dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, " 12641da177e4SLinus Torvalds "SerialNumber=%d\n", 12651da177e4SLinus Torvalds udev->descriptor.iManufacturer, 12661da177e4SLinus Torvalds udev->descriptor.iProduct, 12671da177e4SLinus Torvalds udev->descriptor.iSerialNumber); 12681da177e4SLinus Torvalds show_string(udev, "Product", udev->product); 12691da177e4SLinus Torvalds show_string(udev, "Manufacturer", udev->manufacturer); 12701da177e4SLinus Torvalds show_string(udev, "SerialNumber", udev->serial); 12711da177e4SLinus Torvalds 12721da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 12731da177e4SLinus Torvalds /* 12741da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 12751da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 12761da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 12771da177e4SLinus Torvalds */ 12781da177e4SLinus Torvalds if (!udev->bus->is_b_host 12791da177e4SLinus Torvalds && udev->config 12801da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 12811da177e4SLinus Torvalds struct usb_otg_descriptor *desc = 0; 12821da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 12831da177e4SLinus Torvalds 12841da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 12851da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 12861da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 12871da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 12881da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 128912c3da34SAlan Stern unsigned port1 = udev->portnum; 12901da177e4SLinus Torvalds 12911da177e4SLinus Torvalds dev_info(&udev->dev, 12921da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 12931da177e4SLinus Torvalds (port1 == bus->otg_port) 12941da177e4SLinus Torvalds ? "" : "non-"); 12951da177e4SLinus Torvalds 12961da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 12971da177e4SLinus Torvalds if (port1 == bus->otg_port) 12981da177e4SLinus Torvalds bus->b_hnp_enable = 1; 12991da177e4SLinus Torvalds err = usb_control_msg(udev, 13001da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 13011da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 13021da177e4SLinus Torvalds bus->b_hnp_enable 13031da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 13041da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 13051da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 13061da177e4SLinus Torvalds if (err < 0) { 13071da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 13081da177e4SLinus Torvalds * customize to match your product. 13091da177e4SLinus Torvalds */ 13101da177e4SLinus Torvalds dev_info(&udev->dev, 13111da177e4SLinus Torvalds "can't set HNP mode; %d\n", 13121da177e4SLinus Torvalds err); 13131da177e4SLinus Torvalds bus->b_hnp_enable = 0; 13141da177e4SLinus Torvalds } 13151da177e4SLinus Torvalds } 13161da177e4SLinus Torvalds } 13171da177e4SLinus Torvalds } 13181da177e4SLinus Torvalds 13191da177e4SLinus Torvalds if (!is_targeted(udev)) { 13201da177e4SLinus Torvalds 13211da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 13221da177e4SLinus Torvalds * (Includes HNP test device.) 13231da177e4SLinus Torvalds */ 13241da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 13254956eccdSAlan Stern err = usb_port_suspend(udev); 13261da177e4SLinus Torvalds if (err < 0) 13271da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 13281da177e4SLinus Torvalds } 1329ffcdc18dSVikram Pandita err = -ENOTSUPP; 13301da177e4SLinus Torvalds goto fail; 13311da177e4SLinus Torvalds } 13321da177e4SLinus Torvalds #endif 13331da177e4SLinus Torvalds 13349f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 13359f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 13369f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 13379f8b17e6SKay Sievers 1338195af2ccSAlan Stern /* Increment the parent's count of unsuspended children */ 1339195af2ccSAlan Stern if (udev->parent) 1340195af2ccSAlan Stern usb_autoresume_device(udev->parent); 1341195af2ccSAlan Stern 1342782da727SAlan Stern /* Register the device. The device driver is responsible 13439f8b17e6SKay Sievers * for adding the device files to sysfs and for configuring 13449f8b17e6SKay Sievers * the device. 1345782da727SAlan Stern */ 13461da177e4SLinus Torvalds err = device_add(&udev->dev); 13471da177e4SLinus Torvalds if (err) { 13481da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 1349195af2ccSAlan Stern if (udev->parent) 1350195af2ccSAlan Stern usb_autosuspend_device(udev->parent); 13511da177e4SLinus Torvalds goto fail; 13521da177e4SLinus Torvalds } 13539ad3d6ccSAlan Stern 1354c066475eSGreg Kroah-Hartman exit: 1355c066475eSGreg Kroah-Hartman return err; 13561da177e4SLinus Torvalds 13571da177e4SLinus Torvalds fail: 13581da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 1359c066475eSGreg Kroah-Hartman goto exit; 13601da177e4SLinus Torvalds } 13611da177e4SLinus Torvalds 13621da177e4SLinus Torvalds static int hub_port_status(struct usb_hub *hub, int port1, 13631da177e4SLinus Torvalds u16 *status, u16 *change) 13641da177e4SLinus Torvalds { 13651da177e4SLinus Torvalds int ret; 13661da177e4SLinus Torvalds 1367db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 13681da177e4SLinus Torvalds ret = get_port_status(hub->hdev, port1, &hub->status->port); 1369d25450c6SAlan Stern if (ret < 4) { 13701da177e4SLinus Torvalds dev_err (hub->intfdev, 13711da177e4SLinus Torvalds "%s failed (err = %d)\n", __FUNCTION__, ret); 1372d25450c6SAlan Stern if (ret >= 0) 1373d25450c6SAlan Stern ret = -EIO; 1374d25450c6SAlan Stern } else { 13751da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->port.wPortStatus); 13761da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->port.wPortChange); 13771da177e4SLinus Torvalds ret = 0; 13781da177e4SLinus Torvalds } 1379db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 13801da177e4SLinus Torvalds return ret; 13811da177e4SLinus Torvalds } 13821da177e4SLinus Torvalds 13830165de09SInaky Perez-Gonzalez 13840165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 13850165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 13860165de09SInaky Perez-Gonzalez { 13870165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 13880165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 13890165de09SInaky Perez-Gonzalez return 0; 13900165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 13910165de09SInaky Perez-Gonzalez return hcd->wireless; 13920165de09SInaky Perez-Gonzalez } 13930165de09SInaky Perez-Gonzalez 13940165de09SInaky Perez-Gonzalez 13951da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 13961da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 13971da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 13981da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 13991da177e4SLinus Torvalds #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) 14001da177e4SLinus Torvalds 14011da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 14021da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 14031da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 14041da177e4SLinus Torvalds #define HUB_RESET_TIMEOUT 500 14051da177e4SLinus Torvalds 14061da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 14071da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 14081da177e4SLinus Torvalds { 14091da177e4SLinus Torvalds int delay_time, ret; 14101da177e4SLinus Torvalds u16 portstatus; 14111da177e4SLinus Torvalds u16 portchange; 14121da177e4SLinus Torvalds 14131da177e4SLinus Torvalds for (delay_time = 0; 14141da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 14151da177e4SLinus Torvalds delay_time += delay) { 14161da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 14171da177e4SLinus Torvalds msleep(delay); 14181da177e4SLinus Torvalds 14191da177e4SLinus Torvalds /* read and decode port status */ 14201da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 14211da177e4SLinus Torvalds if (ret < 0) 14221da177e4SLinus Torvalds return ret; 14231da177e4SLinus Torvalds 14241da177e4SLinus Torvalds /* Device went away? */ 14251da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 14261da177e4SLinus Torvalds return -ENOTCONN; 14271da177e4SLinus Torvalds 1428dd4dd19eSAlan Stern /* bomb out completely if the connection bounced */ 14291da177e4SLinus Torvalds if ((portchange & USB_PORT_STAT_C_CONNECTION)) 1430dd4dd19eSAlan Stern return -ENOTCONN; 14311da177e4SLinus Torvalds 14321da177e4SLinus Torvalds /* if we`ve finished resetting, then break out of the loop */ 14331da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_RESET) && 14341da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_ENABLE)) { 14350165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 14360165de09SInaky Perez-Gonzalez udev->speed = USB_SPEED_VARIABLE; 14370165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 14381da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 14391da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 14401da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 14411da177e4SLinus Torvalds else 14421da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 14431da177e4SLinus Torvalds return 0; 14441da177e4SLinus Torvalds } 14451da177e4SLinus Torvalds 14461da177e4SLinus Torvalds /* switch to the long delay after two short delay failures */ 14471da177e4SLinus Torvalds if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 14481da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 14491da177e4SLinus Torvalds 14501da177e4SLinus Torvalds dev_dbg (hub->intfdev, 14511da177e4SLinus Torvalds "port %d not reset yet, waiting %dms\n", 14521da177e4SLinus Torvalds port1, delay); 14531da177e4SLinus Torvalds } 14541da177e4SLinus Torvalds 14551da177e4SLinus Torvalds return -EBUSY; 14561da177e4SLinus Torvalds } 14571da177e4SLinus Torvalds 14581da177e4SLinus Torvalds static int hub_port_reset(struct usb_hub *hub, int port1, 14591da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 14601da177e4SLinus Torvalds { 14611da177e4SLinus Torvalds int i, status; 14621da177e4SLinus Torvalds 14631da177e4SLinus Torvalds /* Reset the port */ 14641da177e4SLinus Torvalds for (i = 0; i < PORT_RESET_TRIES; i++) { 14651da177e4SLinus Torvalds status = set_port_feature(hub->hdev, 14661da177e4SLinus Torvalds port1, USB_PORT_FEAT_RESET); 14671da177e4SLinus Torvalds if (status) 14681da177e4SLinus Torvalds dev_err(hub->intfdev, 14691da177e4SLinus Torvalds "cannot reset port %d (err = %d)\n", 14701da177e4SLinus Torvalds port1, status); 14711da177e4SLinus Torvalds else { 14721da177e4SLinus Torvalds status = hub_port_wait_reset(hub, port1, udev, delay); 1473dd16525bSDavid Brownell if (status && status != -ENOTCONN) 14741da177e4SLinus Torvalds dev_dbg(hub->intfdev, 14751da177e4SLinus Torvalds "port_wait_reset: err = %d\n", 14761da177e4SLinus Torvalds status); 14771da177e4SLinus Torvalds } 14781da177e4SLinus Torvalds 14791da177e4SLinus Torvalds /* return on disconnect or reset */ 14801da177e4SLinus Torvalds switch (status) { 14811da177e4SLinus Torvalds case 0: 1482b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 1483b789696aSDavid Brownell msleep(10 + 40); 14841da177e4SLinus Torvalds /* FALL THROUGH */ 14851da177e4SLinus Torvalds case -ENOTCONN: 14861da177e4SLinus Torvalds case -ENODEV: 14871da177e4SLinus Torvalds clear_port_feature(hub->hdev, 14881da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 14891da177e4SLinus Torvalds /* FIXME need disconnect() for NOTATTACHED device */ 14901da177e4SLinus Torvalds usb_set_device_state(udev, status 14911da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 14921da177e4SLinus Torvalds : USB_STATE_DEFAULT); 14931da177e4SLinus Torvalds return status; 14941da177e4SLinus Torvalds } 14951da177e4SLinus Torvalds 14961da177e4SLinus Torvalds dev_dbg (hub->intfdev, 14971da177e4SLinus Torvalds "port %d not enabled, trying reset again...\n", 14981da177e4SLinus Torvalds port1); 14991da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 15001da177e4SLinus Torvalds } 15011da177e4SLinus Torvalds 15021da177e4SLinus Torvalds dev_err (hub->intfdev, 15031da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 15041da177e4SLinus Torvalds port1); 15051da177e4SLinus Torvalds 15061da177e4SLinus Torvalds return status; 15071da177e4SLinus Torvalds } 15081da177e4SLinus Torvalds 1509d388dab7SAlan Stern #ifdef CONFIG_PM 15101da177e4SLinus Torvalds 15111da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 15121da177e4SLinus Torvalds 15131da177e4SLinus Torvalds /* 1514140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 1515624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 15165edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 15171da177e4SLinus Torvalds * 15181da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 15191da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 15201da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 1521140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 15221da177e4SLinus Torvalds * to disconnect devices while they are suspended. 15231da177e4SLinus Torvalds * 1524390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 1525390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 1526390a8c34SDavid Brownell * 1527624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 1528624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 1529624d6c07SAlan Stern * All devices below the suspended port are also suspended. 1530624d6c07SAlan Stern * 1531624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 1532624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 1533624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 1534624d6c07SAlan Stern * some cases, this wakes the USB host. 1535624d6c07SAlan Stern * 15361da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 15371da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 15381da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 15391da177e4SLinus Torvalds * 15404956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 15414956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 15424956eccdSAlan Stern * State transitions include: 15434956eccdSAlan Stern * 15444956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 15454956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 15464956eccdSAlan Stern * 15474956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 15484956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 15494956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 15504956eccdSAlan Stern * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 15514956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 15524956eccdSAlan Stern * 15534956eccdSAlan Stern * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when 15544956eccdSAlan Stern * the root hub for their bus goes into global suspend ... so we don't 15554956eccdSAlan Stern * (falsely) update the device power state to say it suspended. 15564956eccdSAlan Stern * 15571da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 15581da177e4SLinus Torvalds */ 1559140d8f68SAlan Stern int usb_port_suspend(struct usb_device *udev) 15601da177e4SLinus Torvalds { 1561624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 1562624d6c07SAlan Stern int port1 = udev->portnum; 1563624d6c07SAlan Stern int status; 15644956eccdSAlan Stern 1565624d6c07SAlan Stern // dev_dbg(hub->intfdev, "suspend port %d\n", port1); 1566624d6c07SAlan Stern 1567624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 1568624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 1569624d6c07SAlan Stern * 1570624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 1571624d6c07SAlan Stern * we don't explicitly enable it here. 1572624d6c07SAlan Stern */ 1573624d6c07SAlan Stern if (udev->do_remote_wakeup) { 1574624d6c07SAlan Stern status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 1575624d6c07SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 1576624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 1577624d6c07SAlan Stern NULL, 0, 1578624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 1579624d6c07SAlan Stern if (status) 1580624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 1581624d6c07SAlan Stern status); 1582624d6c07SAlan Stern } 1583624d6c07SAlan Stern 1584624d6c07SAlan Stern /* see 7.1.7.6 */ 1585624d6c07SAlan Stern status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); 1586624d6c07SAlan Stern if (status) { 1587624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", 1588624d6c07SAlan Stern port1, status); 1589624d6c07SAlan Stern /* paranoia: "should not happen" */ 1590624d6c07SAlan Stern (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 1591624d6c07SAlan Stern USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 1592624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 1593624d6c07SAlan Stern NULL, 0, 1594624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 1595624d6c07SAlan Stern } else { 1596624d6c07SAlan Stern /* device has up to 10 msec to fully suspend */ 1597624d6c07SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend\n", 1598624d6c07SAlan Stern udev->auto_pm ? "auto-" : ""); 1599624d6c07SAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 1600624d6c07SAlan Stern msleep(10); 1601624d6c07SAlan Stern } 16024956eccdSAlan Stern return status; 16031da177e4SLinus Torvalds } 1604f3f3253dSDavid Brownell 16051da177e4SLinus Torvalds /* 1606390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 1607390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 160854515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 16091da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 16101da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 16111da177e4SLinus Torvalds * in the tree that's rooted at this device. 161254515fe5SAlan Stern * 161354515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 161454515fe5SAlan Stern * status check is done. 16151da177e4SLinus Torvalds */ 1616140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 16171da177e4SLinus Torvalds { 161854515fe5SAlan Stern int status = 0; 16191da177e4SLinus Torvalds u16 devstatus; 16201da177e4SLinus Torvalds 16211da177e4SLinus Torvalds /* caller owns the udev device lock */ 162254515fe5SAlan Stern dev_dbg(&udev->dev, "finish %sresume\n", 162354515fe5SAlan Stern udev->reset_resume ? "reset-" : ""); 16241da177e4SLinus Torvalds 16251da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 16261da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 16271da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 16281da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 16291da177e4SLinus Torvalds */ 16301da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 16311da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 16321da177e4SLinus Torvalds : USB_STATE_ADDRESS); 16331da177e4SLinus Torvalds 163454515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 163554515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 163654515fe5SAlan Stern * operation is carried out here, after the port has been 163754515fe5SAlan Stern * resumed. 163854515fe5SAlan Stern */ 163954515fe5SAlan Stern if (udev->reset_resume) 164054515fe5SAlan Stern status = usb_reset_device(udev); 164154515fe5SAlan Stern 16421da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 16431da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 16441da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 16451da177e4SLinus Torvalds */ 164654515fe5SAlan Stern if (status == 0) { 164746dede46SAlan Stern devstatus = 0; 16481da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 1649b40b7a90SAlan Stern if (status >= 0) 165046dede46SAlan Stern status = (status > 0 ? 0 : -ENODEV); 165154515fe5SAlan Stern } 1652b40b7a90SAlan Stern 1653624d6c07SAlan Stern if (status) { 1654624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 16551da177e4SLinus Torvalds status); 1656624d6c07SAlan Stern } else if (udev->actconfig) { 16571da177e4SLinus Torvalds le16_to_cpus(&devstatus); 1658686314cfSAlan Stern if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { 16591da177e4SLinus Torvalds status = usb_control_msg(udev, 16601da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 16611da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, 16621da177e4SLinus Torvalds USB_RECIP_DEVICE, 16631da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 16641da177e4SLinus Torvalds NULL, 0, 16651da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 1666a8e7c565SAlan Stern if (status) 16671da177e4SLinus Torvalds dev_dbg(&udev->dev, "disable remote " 16681da177e4SLinus Torvalds "wakeup, status %d\n", status); 16694bf0ba86SAlan Stern } 16701da177e4SLinus Torvalds status = 0; 16711da177e4SLinus Torvalds } 16721da177e4SLinus Torvalds return status; 16731da177e4SLinus Torvalds } 16741da177e4SLinus Torvalds 1675624d6c07SAlan Stern /* 1676624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 1677624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 1678624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 1679624d6c07SAlan Stern * 1680624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 1681624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 1682624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 1683624d6c07SAlan Stern * the host and the device is the same as it was when the device 1684624d6c07SAlan Stern * suspended. 1685624d6c07SAlan Stern * 168654515fe5SAlan Stern * If CONFIG_USB_PERSIST and @udev->reset_resume are both set then this 168754515fe5SAlan Stern * routine won't check that the port is still enabled. Furthermore, 168854515fe5SAlan Stern * if @udev->reset_resume is set then finish_port_resume() above will 168954515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 169054515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 169154515fe5SAlan Stern * 169254515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 169354515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 169454515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 169554515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 169654515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 169754515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 169854515fe5SAlan Stern * made to appear as if it had not disconnected. 169954515fe5SAlan Stern * 170054515fe5SAlan Stern * This facility is inherently dangerous. Although usb_reset_device() 170154515fe5SAlan Stern * makes every effort to insure that the same device is present after the 170254515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 170354515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 170454515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 170554515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 170654515fe5SAlan Stern * new card is corrupted and the system crashes. 170754515fe5SAlan Stern * 1708624d6c07SAlan Stern * Returns 0 on success, else negative errno. 1709624d6c07SAlan Stern */ 1710624d6c07SAlan Stern int usb_port_resume(struct usb_device *udev) 17111da177e4SLinus Torvalds { 1712624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 1713624d6c07SAlan Stern int port1 = udev->portnum; 17141da177e4SLinus Torvalds int status; 1715d25450c6SAlan Stern u16 portchange, portstatus; 171654515fe5SAlan Stern unsigned mask_flags, want_flags; 1717d25450c6SAlan Stern 1718d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 1719d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 1720d25450c6SAlan Stern if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND)) 1721d25450c6SAlan Stern goto SuspendCleared; 17221da177e4SLinus Torvalds 17231da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "resume port %d\n", port1); 17241da177e4SLinus Torvalds 1725d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 1726d5cbad4bSAlan Stern 17271da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 17281da177e4SLinus Torvalds status = clear_port_feature(hub->hdev, 17291da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 17301da177e4SLinus Torvalds if (status) { 1731624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", 17321da177e4SLinus Torvalds port1, status); 17331da177e4SLinus Torvalds } else { 17341da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 1735645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 1736645daaabSAlan Stern udev->auto_pm ? "auto-" : ""); 17371da177e4SLinus Torvalds msleep(25); 17381da177e4SLinus Torvalds 17391da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 17401da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 17411da177e4SLinus Torvalds * sequence. 17421da177e4SLinus Torvalds */ 1743d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 174454515fe5SAlan Stern 1745d25450c6SAlan Stern SuspendCleared: 174654515fe5SAlan Stern if (USB_PERSIST && udev->reset_resume) 174754515fe5SAlan Stern want_flags = USB_PORT_STAT_POWER 174854515fe5SAlan Stern | USB_PORT_STAT_CONNECTION; 174954515fe5SAlan Stern else 175054515fe5SAlan Stern want_flags = USB_PORT_STAT_POWER 175154515fe5SAlan Stern | USB_PORT_STAT_CONNECTION 175254515fe5SAlan Stern | USB_PORT_STAT_ENABLE; 175354515fe5SAlan Stern mask_flags = want_flags | USB_PORT_STAT_SUSPEND; 175454515fe5SAlan Stern 175554515fe5SAlan Stern if (status < 0 || (portstatus & mask_flags) != want_flags) { 17561da177e4SLinus Torvalds dev_dbg(hub->intfdev, 17571da177e4SLinus Torvalds "port %d status %04x.%04x after resume, %d\n", 1758d25450c6SAlan Stern port1, portchange, portstatus, status); 175920307949SAlan Stern if (status >= 0) 176020307949SAlan Stern status = -ENODEV; 17611da177e4SLinus Torvalds } else { 176220307949SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 176320307949SAlan Stern clear_port_feature(hub->hdev, port1, 176420307949SAlan Stern USB_PORT_FEAT_C_SUSPEND); 17651da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 17661da177e4SLinus Torvalds msleep(10); 17671da177e4SLinus Torvalds } 17681da177e4SLinus Torvalds } 17691da177e4SLinus Torvalds 1770d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 1771d5cbad4bSAlan Stern if (!hub->hdev->parent && !hub->busy_bits[0]) 1772d5cbad4bSAlan Stern usb_enable_root_hub_irq(hub->hdev->bus); 1773d5cbad4bSAlan Stern 177454515fe5SAlan Stern if (status == 0) 177554515fe5SAlan Stern status = finish_port_resume(udev); 177654515fe5SAlan Stern if (status < 0) { 177754515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 177854515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 177954515fe5SAlan Stern } 17801da177e4SLinus Torvalds return status; 17811da177e4SLinus Torvalds } 17821da177e4SLinus Torvalds 17831da177e4SLinus Torvalds static int remote_wakeup(struct usb_device *udev) 17841da177e4SLinus Torvalds { 17851da177e4SLinus Torvalds int status = 0; 17861da177e4SLinus Torvalds 17879ad3d6ccSAlan Stern usb_lock_device(udev); 17881da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 1789645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 17901941044aSAlan Stern usb_mark_last_busy(udev); 17916b157c9bSAlan Stern status = usb_external_resume_device(udev); 1792d25450c6SAlan Stern } 17939ad3d6ccSAlan Stern usb_unlock_device(udev); 17941da177e4SLinus Torvalds return status; 17951da177e4SLinus Torvalds } 17961da177e4SLinus Torvalds 1797d388dab7SAlan Stern #else /* CONFIG_USB_SUSPEND */ 1798d388dab7SAlan Stern 1799d388dab7SAlan Stern /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ 1800d388dab7SAlan Stern 1801d388dab7SAlan Stern int usb_port_suspend(struct usb_device *udev) 1802d388dab7SAlan Stern { 1803d388dab7SAlan Stern return 0; 1804d388dab7SAlan Stern } 1805d388dab7SAlan Stern 1806d388dab7SAlan Stern int usb_port_resume(struct usb_device *udev) 1807d388dab7SAlan Stern { 180854515fe5SAlan Stern int status = 0; 180954515fe5SAlan Stern 181054515fe5SAlan Stern /* However we may need to do a reset-resume */ 181154515fe5SAlan Stern if (udev->reset_resume) { 181254515fe5SAlan Stern dev_dbg(&udev->dev, "reset-resume\n"); 181354515fe5SAlan Stern status = usb_reset_device(udev); 181454515fe5SAlan Stern } 181554515fe5SAlan Stern return status; 1816d388dab7SAlan Stern } 1817d388dab7SAlan Stern 1818d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 1819d388dab7SAlan Stern { 1820d388dab7SAlan Stern return 0; 1821d388dab7SAlan Stern } 1822d388dab7SAlan Stern 1823d388dab7SAlan Stern #endif 1824d388dab7SAlan Stern 1825db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 18261da177e4SLinus Torvalds { 18271da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 18281da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 18291da177e4SLinus Torvalds unsigned port1; 18301da177e4SLinus Torvalds 1831c9f89fa4SDavid Brownell /* fail if children aren't already suspended */ 18321da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 18331da177e4SLinus Torvalds struct usb_device *udev; 18341da177e4SLinus Torvalds 18351da177e4SLinus Torvalds udev = hdev->children [port1-1]; 1836114b368cSAlan Stern if (udev && msg.event == PM_EVENT_SUSPEND && 1837f3f3253dSDavid Brownell #ifdef CONFIG_USB_SUSPEND 1838114b368cSAlan Stern udev->state != USB_STATE_SUSPENDED 1839114b368cSAlan Stern #else 1840114b368cSAlan Stern udev->dev.power.power_state.event 1841114b368cSAlan Stern == PM_EVENT_ON 1842f3f3253dSDavid Brownell #endif 1843114b368cSAlan Stern ) { 1844645daaabSAlan Stern if (!hdev->auto_pm) 1845645daaabSAlan Stern dev_dbg(&intf->dev, "port %d nyet suspended\n", 1846645daaabSAlan Stern port1); 1847c9f89fa4SDavid Brownell return -EBUSY; 1848c9f89fa4SDavid Brownell } 18491da177e4SLinus Torvalds } 18501da177e4SLinus Torvalds 185140f122f3SAlan Stern dev_dbg(&intf->dev, "%s\n", __FUNCTION__); 185240f122f3SAlan Stern 1853c9f89fa4SDavid Brownell /* stop khubd and related activity */ 1854c9f89fa4SDavid Brownell hub_quiesce(hub); 1855b6f6436dSAlan Stern return 0; 18561da177e4SLinus Torvalds } 18571da177e4SLinus Torvalds 18581da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 18591da177e4SLinus Torvalds { 18601da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 18611da177e4SLinus Torvalds 186240f122f3SAlan Stern dev_dbg(&intf->dev, "%s\n", __FUNCTION__); 186340f122f3SAlan Stern 1864a8e7c565SAlan Stern /* tell khubd to look for changes on this hub */ 1865f3f3253dSDavid Brownell hub_activate(hub); 18661da177e4SLinus Torvalds return 0; 18671da177e4SLinus Torvalds } 18681da177e4SLinus Torvalds 1869b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 1870f07600cfSAlan Stern { 1871b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 1872f07600cfSAlan Stern struct usb_device *hdev = hub->hdev; 1873f07600cfSAlan Stern int port1; 1874f07600cfSAlan Stern 1875b41a60ecSAlan Stern hub_power_on(hub); 1876b41a60ecSAlan Stern 1877f07600cfSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 1878f07600cfSAlan Stern struct usb_device *child = hdev->children[port1-1]; 1879f07600cfSAlan Stern 1880f07600cfSAlan Stern if (child) { 1881b41a60ecSAlan Stern 1882b41a60ecSAlan Stern /* For "USB_PERSIST"-enabled children we must 1883b41a60ecSAlan Stern * mark the child device for reset-resume and 1884b41a60ecSAlan Stern * turn off the connect-change status to prevent 1885b41a60ecSAlan Stern * khubd from disconnecting it later. 1886b41a60ecSAlan Stern */ 1887b41a60ecSAlan Stern if (USB_PERSIST && child->persist_enabled) { 1888f07600cfSAlan Stern child->reset_resume = 1; 1889f07600cfSAlan Stern clear_port_feature(hdev, port1, 1890f07600cfSAlan Stern USB_PORT_FEAT_C_CONNECTION); 1891f07600cfSAlan Stern 1892b41a60ecSAlan Stern /* Otherwise we must disconnect the child, 1893b41a60ecSAlan Stern * but as we may not lock the child device here 1894b41a60ecSAlan Stern * we have to do a "logical" disconnect. 1895f07600cfSAlan Stern */ 1896b41a60ecSAlan Stern } else { 1897b41a60ecSAlan Stern hub_port_logical_disconnect(hub, port1); 1898f07600cfSAlan Stern } 1899b41a60ecSAlan Stern } 1900b41a60ecSAlan Stern } 1901b41a60ecSAlan Stern 1902f07600cfSAlan Stern hub_activate(hub); 1903f07600cfSAlan Stern return 0; 1904f07600cfSAlan Stern } 1905f07600cfSAlan Stern 190654515fe5SAlan Stern /** 190754515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 190854515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 190954515fe5SAlan Stern * 191054515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 191154515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 191254515fe5SAlan Stern * has been reset. The routine marks @rhdev as having lost power. When 191354515fe5SAlan Stern * the hub driver is resumed it will take notice; if CONFIG_USB_PERSIST 191454515fe5SAlan Stern * is enabled then it will carry out power-session recovery, otherwise 191554515fe5SAlan Stern * it will disconnect all the child devices. 191654515fe5SAlan Stern */ 191754515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 191854515fe5SAlan Stern { 191954515fe5SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 192054515fe5SAlan Stern rhdev->reset_resume = 1; 192154515fe5SAlan Stern } 192254515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 192354515fe5SAlan Stern 1924d388dab7SAlan Stern #else /* CONFIG_PM */ 1925d388dab7SAlan Stern 1926d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 1927d388dab7SAlan Stern { 1928d388dab7SAlan Stern return 0; 1929d388dab7SAlan Stern } 1930d388dab7SAlan Stern 1931511366daSAndrew Morton #define hub_suspend NULL 1932511366daSAndrew Morton #define hub_resume NULL 1933f07600cfSAlan Stern #define hub_reset_resume NULL 1934d388dab7SAlan Stern #endif 1935d388dab7SAlan Stern 19361da177e4SLinus Torvalds 19371da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 19381da177e4SLinus Torvalds * 19391da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 19401da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 19411da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 19421da177e4SLinus Torvalds * 19431da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 19441da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 19451da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 19461da177e4SLinus Torvalds * 19471da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 19481da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 19491da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 19501da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 19511da177e4SLinus Torvalds */ 19521da177e4SLinus Torvalds 19531da177e4SLinus Torvalds #define HUB_DEBOUNCE_TIMEOUT 1500 19541da177e4SLinus Torvalds #define HUB_DEBOUNCE_STEP 25 19551da177e4SLinus Torvalds #define HUB_DEBOUNCE_STABLE 100 19561da177e4SLinus Torvalds 19571da177e4SLinus Torvalds static int hub_port_debounce(struct usb_hub *hub, int port1) 19581da177e4SLinus Torvalds { 19591da177e4SLinus Torvalds int ret; 19601da177e4SLinus Torvalds int total_time, stable_time = 0; 19611da177e4SLinus Torvalds u16 portchange, portstatus; 19621da177e4SLinus Torvalds unsigned connection = 0xffff; 19631da177e4SLinus Torvalds 19641da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 19651da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 19661da177e4SLinus Torvalds if (ret < 0) 19671da177e4SLinus Torvalds return ret; 19681da177e4SLinus Torvalds 19691da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 19701da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 19711da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 19721da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 19731da177e4SLinus Torvalds break; 19741da177e4SLinus Torvalds } else { 19751da177e4SLinus Torvalds stable_time = 0; 19761da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 19771da177e4SLinus Torvalds } 19781da177e4SLinus Torvalds 19791da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 19801da177e4SLinus Torvalds clear_port_feature(hub->hdev, port1, 19811da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 19821da177e4SLinus Torvalds } 19831da177e4SLinus Torvalds 19841da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 19851da177e4SLinus Torvalds break; 19861da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 19871da177e4SLinus Torvalds } 19881da177e4SLinus Torvalds 19891da177e4SLinus Torvalds dev_dbg (hub->intfdev, 19901da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 19911da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 19921da177e4SLinus Torvalds 19931da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 19941da177e4SLinus Torvalds return -ETIMEDOUT; 19951da177e4SLinus Torvalds return portstatus; 19961da177e4SLinus Torvalds } 19971da177e4SLinus Torvalds 19981da177e4SLinus Torvalds static void ep0_reinit(struct usb_device *udev) 19991da177e4SLinus Torvalds { 20001da177e4SLinus Torvalds usb_disable_endpoint(udev, 0 + USB_DIR_IN); 20011da177e4SLinus Torvalds usb_disable_endpoint(udev, 0 + USB_DIR_OUT); 2002bdd016baSAlan Stern usb_enable_endpoint(udev, &udev->ep0); 20031da177e4SLinus Torvalds } 20041da177e4SLinus Torvalds 20051da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 20061da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 20071da177e4SLinus Torvalds 20081da177e4SLinus Torvalds static int hub_set_address(struct usb_device *udev) 20091da177e4SLinus Torvalds { 20101da177e4SLinus Torvalds int retval; 20111da177e4SLinus Torvalds 20121da177e4SLinus Torvalds if (udev->devnum == 0) 20131da177e4SLinus Torvalds return -EINVAL; 20141da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 20151da177e4SLinus Torvalds return 0; 20161da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 20171da177e4SLinus Torvalds return -EINVAL; 20181da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 20191da177e4SLinus Torvalds USB_REQ_SET_ADDRESS, 0, udev->devnum, 0, 20201da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 20211da177e4SLinus Torvalds if (retval == 0) { 20221da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 20231da177e4SLinus Torvalds ep0_reinit(udev); 20241da177e4SLinus Torvalds } 20251da177e4SLinus Torvalds return retval; 20261da177e4SLinus Torvalds } 20271da177e4SLinus Torvalds 20281da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 20291da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 20301da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 20311da177e4SLinus Torvalds * 20321da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 20331da177e4SLinus Torvalds * usb_reset_device), the caller must own the device lock. For a 20341da177e4SLinus Torvalds * newly detected device that is not accessible through any global 20351da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 20361da177e4SLinus Torvalds */ 20371da177e4SLinus Torvalds static int 20381da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 20391da177e4SLinus Torvalds int retry_counter) 20401da177e4SLinus Torvalds { 20414186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 20421da177e4SLinus Torvalds 20431da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 20441da177e4SLinus Torvalds int i, j, retval; 20451da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 20461da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 204783a07196SInaky Perez-Gonzalez char *speed, *type; 20481da177e4SLinus Torvalds 20491da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 20501da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 20511da177e4SLinus Torvalds */ 20521da177e4SLinus Torvalds if (!hdev->parent) { 20531da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 20541da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 20551da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 20561da177e4SLinus Torvalds } 20571da177e4SLinus Torvalds 20581da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 20591da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 20601da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 20611da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 20621da177e4SLinus Torvalds 20634186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 20641da177e4SLinus Torvalds 20651da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 20661da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 20671da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 20681da177e4SLinus Torvalds goto fail; 20691da177e4SLinus Torvalds /* success, speed is known */ 20701da177e4SLinus Torvalds retval = -ENODEV; 20711da177e4SLinus Torvalds 20721da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 20731da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 20741da177e4SLinus Torvalds goto fail; 20751da177e4SLinus Torvalds } 20761da177e4SLinus Torvalds oldspeed = udev->speed; 20771da177e4SLinus Torvalds 20781da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 20791da177e4SLinus Torvalds * it's fixed size except for full speed devices. 20805bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 20815bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 20821da177e4SLinus Torvalds */ 20831da177e4SLinus Torvalds switch (udev->speed) { 20845bb6e0aeSInaky Perez-Gonzalez case USB_SPEED_VARIABLE: /* fixed at 512 */ 20855bb6e0aeSInaky Perez-Gonzalez udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512); 20865bb6e0aeSInaky Perez-Gonzalez break; 20871da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 20881da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); 20891da177e4SLinus Torvalds break; 20901da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 20911da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 20921da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 20931da177e4SLinus Torvalds * then correct our initial guess. 20941da177e4SLinus Torvalds */ 20951da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); 20961da177e4SLinus Torvalds break; 20971da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 20981da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8); 20991da177e4SLinus Torvalds break; 21001da177e4SLinus Torvalds default: 21011da177e4SLinus Torvalds goto fail; 21021da177e4SLinus Torvalds } 21031da177e4SLinus Torvalds 210483a07196SInaky Perez-Gonzalez type = ""; 210583a07196SInaky Perez-Gonzalez switch (udev->speed) { 21061da177e4SLinus Torvalds case USB_SPEED_LOW: speed = "low"; break; 21071da177e4SLinus Torvalds case USB_SPEED_FULL: speed = "full"; break; 21081da177e4SLinus Torvalds case USB_SPEED_HIGH: speed = "high"; break; 210983a07196SInaky Perez-Gonzalez case USB_SPEED_VARIABLE: 211083a07196SInaky Perez-Gonzalez speed = "variable"; 211183a07196SInaky Perez-Gonzalez type = "Wireless "; 211283a07196SInaky Perez-Gonzalez break; 21131da177e4SLinus Torvalds default: speed = "?"; break; 211483a07196SInaky Perez-Gonzalez } 211583a07196SInaky Perez-Gonzalez dev_info (&udev->dev, 211683a07196SInaky Perez-Gonzalez "%s %s speed %sUSB device using %s and address %d\n", 211783a07196SInaky Perez-Gonzalez (udev->config) ? "reset" : "new", speed, type, 211883a07196SInaky Perez-Gonzalez udev->bus->controller->driver->name, udev->devnum); 21191da177e4SLinus Torvalds 21201da177e4SLinus Torvalds /* Set up TT records, if needed */ 21211da177e4SLinus Torvalds if (hdev->tt) { 21221da177e4SLinus Torvalds udev->tt = hdev->tt; 21231da177e4SLinus Torvalds udev->ttport = hdev->ttport; 21241da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 21251da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 21261da177e4SLinus Torvalds udev->tt = &hub->tt; 21271da177e4SLinus Torvalds udev->ttport = port1; 21281da177e4SLinus Torvalds } 21291da177e4SLinus Torvalds 21301da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 21311da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 21321da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 21331da177e4SLinus Torvalds * Change it cautiously. 21341da177e4SLinus Torvalds * 21351da177e4SLinus Torvalds * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 21361da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 21371da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 21381da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 21391da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 21401da177e4SLinus Torvalds * value. 21411da177e4SLinus Torvalds */ 21421da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 21431da177e4SLinus Torvalds if (USE_NEW_SCHEME(retry_counter)) { 21441da177e4SLinus Torvalds struct usb_device_descriptor *buf; 21451da177e4SLinus Torvalds int r = 0; 21461da177e4SLinus Torvalds 21471da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 21481da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 21491da177e4SLinus Torvalds if (!buf) { 21501da177e4SLinus Torvalds retval = -ENOMEM; 21511da177e4SLinus Torvalds continue; 21521da177e4SLinus Torvalds } 21531da177e4SLinus Torvalds 2154b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 2155b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 2156b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 21571da177e4SLinus Torvalds */ 21581da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 21591da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 21601da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 21611da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 21621da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 21631da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 2164b89ee19aSAlan Stern USB_CTRL_GET_TIMEOUT); 21651da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 21665bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 21671da177e4SLinus Torvalds if (buf->bDescriptorType == 21681da177e4SLinus Torvalds USB_DT_DEVICE) { 21691da177e4SLinus Torvalds r = 0; 21701da177e4SLinus Torvalds break; 21711da177e4SLinus Torvalds } 21721da177e4SLinus Torvalds /* FALL THROUGH */ 21731da177e4SLinus Torvalds default: 21741da177e4SLinus Torvalds if (r == 0) 21751da177e4SLinus Torvalds r = -EPROTO; 21761da177e4SLinus Torvalds break; 21771da177e4SLinus Torvalds } 21781da177e4SLinus Torvalds if (r == 0) 21791da177e4SLinus Torvalds break; 21801da177e4SLinus Torvalds } 21811da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 21821da177e4SLinus Torvalds buf->bMaxPacketSize0; 21831da177e4SLinus Torvalds kfree(buf); 21841da177e4SLinus Torvalds 21851da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 21861da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 21871da177e4SLinus Torvalds goto fail; 21881da177e4SLinus Torvalds if (oldspeed != udev->speed) { 21891da177e4SLinus Torvalds dev_dbg(&udev->dev, 21901da177e4SLinus Torvalds "device reset changed speed!\n"); 21911da177e4SLinus Torvalds retval = -ENODEV; 21921da177e4SLinus Torvalds goto fail; 21931da177e4SLinus Torvalds } 21941da177e4SLinus Torvalds if (r) { 21951da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor " 21961da177e4SLinus Torvalds "read/%s, error %d\n", 21971da177e4SLinus Torvalds "64", r); 21981da177e4SLinus Torvalds retval = -EMSGSIZE; 21991da177e4SLinus Torvalds continue; 22001da177e4SLinus Torvalds } 22011da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 22021da177e4SLinus Torvalds } 22031da177e4SLinus Torvalds 22041da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 22051da177e4SLinus Torvalds retval = hub_set_address(udev); 22061da177e4SLinus Torvalds if (retval >= 0) 22071da177e4SLinus Torvalds break; 22081da177e4SLinus Torvalds msleep(200); 22091da177e4SLinus Torvalds } 22101da177e4SLinus Torvalds if (retval < 0) { 22111da177e4SLinus Torvalds dev_err(&udev->dev, 22121da177e4SLinus Torvalds "device not accepting address %d, error %d\n", 22131da177e4SLinus Torvalds udev->devnum, retval); 22141da177e4SLinus Torvalds goto fail; 22151da177e4SLinus Torvalds } 22161da177e4SLinus Torvalds 22171da177e4SLinus Torvalds /* cope with hardware quirkiness: 22181da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 22191da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 22201da177e4SLinus Torvalds */ 22211da177e4SLinus Torvalds msleep(10); 22221da177e4SLinus Torvalds if (USE_NEW_SCHEME(retry_counter)) 22231da177e4SLinus Torvalds break; 22241da177e4SLinus Torvalds 22251da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 22261da177e4SLinus Torvalds if (retval < 8) { 22271da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor " 22281da177e4SLinus Torvalds "read/%s, error %d\n", 22291da177e4SLinus Torvalds "8", retval); 22301da177e4SLinus Torvalds if (retval >= 0) 22311da177e4SLinus Torvalds retval = -EMSGSIZE; 22321da177e4SLinus Torvalds } else { 22331da177e4SLinus Torvalds retval = 0; 22341da177e4SLinus Torvalds break; 22351da177e4SLinus Torvalds } 22361da177e4SLinus Torvalds } 22371da177e4SLinus Torvalds if (retval) 22381da177e4SLinus Torvalds goto fail; 22391da177e4SLinus Torvalds 22405bb6e0aeSInaky Perez-Gonzalez i = udev->descriptor.bMaxPacketSize0 == 0xff? 22415bb6e0aeSInaky Perez-Gonzalez 512 : udev->descriptor.bMaxPacketSize0; 22421da177e4SLinus Torvalds if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { 22431da177e4SLinus Torvalds if (udev->speed != USB_SPEED_FULL || 22441da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 22451da177e4SLinus Torvalds dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); 22461da177e4SLinus Torvalds retval = -EMSGSIZE; 22471da177e4SLinus Torvalds goto fail; 22481da177e4SLinus Torvalds } 22491da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 22501da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 22511da177e4SLinus Torvalds ep0_reinit(udev); 22521da177e4SLinus Torvalds } 22531da177e4SLinus Torvalds 22541da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 22551da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 22561da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor read/%s, error %d\n", 22571da177e4SLinus Torvalds "all", retval); 22581da177e4SLinus Torvalds if (retval >= 0) 22591da177e4SLinus Torvalds retval = -ENOMSG; 22601da177e4SLinus Torvalds goto fail; 22611da177e4SLinus Torvalds } 22621da177e4SLinus Torvalds 22631da177e4SLinus Torvalds retval = 0; 22641da177e4SLinus Torvalds 22651da177e4SLinus Torvalds fail: 22661da177e4SLinus Torvalds if (retval) 22671da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 22684186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 22691da177e4SLinus Torvalds return retval; 22701da177e4SLinus Torvalds } 22711da177e4SLinus Torvalds 22721da177e4SLinus Torvalds static void 22731da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 22741da177e4SLinus Torvalds { 22751da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 22761da177e4SLinus Torvalds int status; 22771da177e4SLinus Torvalds 2278e94b1766SChristoph Lameter qual = kmalloc (sizeof *qual, GFP_KERNEL); 22791da177e4SLinus Torvalds if (qual == NULL) 22801da177e4SLinus Torvalds return; 22811da177e4SLinus Torvalds 22821da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 22831da177e4SLinus Torvalds qual, sizeof *qual); 22841da177e4SLinus Torvalds if (status == sizeof *qual) { 22851da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 22861da177e4SLinus Torvalds "connect to a high speed hub\n"); 22871da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 22881da177e4SLinus Torvalds if (hub->has_indicators) { 22891da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 2290c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 22911da177e4SLinus Torvalds } 22921da177e4SLinus Torvalds } 22931da177e4SLinus Torvalds kfree(qual); 22941da177e4SLinus Torvalds } 22951da177e4SLinus Torvalds 22961da177e4SLinus Torvalds static unsigned 22971da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 22981da177e4SLinus Torvalds { 22991da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 23001da177e4SLinus Torvalds int remaining; 230155c52718SAlan Stern int port1; 23021da177e4SLinus Torvalds 230355c52718SAlan Stern if (!hub->limited_power) 23041da177e4SLinus Torvalds return 0; 23051da177e4SLinus Torvalds 230655c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 230755c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 230855c52718SAlan Stern struct usb_device *udev = hdev->children[port1 - 1]; 230955c52718SAlan Stern int delta; 23101da177e4SLinus Torvalds 23111da177e4SLinus Torvalds if (!udev) 23121da177e4SLinus Torvalds continue; 23131da177e4SLinus Torvalds 231455c52718SAlan Stern /* Unconfigured devices may not use more than 100mA, 231555c52718SAlan Stern * or 8mA for OTG ports */ 23161da177e4SLinus Torvalds if (udev->actconfig) 231755c52718SAlan Stern delta = udev->actconfig->desc.bMaxPower * 2; 231855c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 231955c52718SAlan Stern delta = 100; 23201da177e4SLinus Torvalds else 232155c52718SAlan Stern delta = 8; 232255c52718SAlan Stern if (delta > hub->mA_per_port) 232355c52718SAlan Stern dev_warn(&udev->dev, "%dmA is over %umA budget " 232455c52718SAlan Stern "for port %d!\n", 232555c52718SAlan Stern delta, hub->mA_per_port, port1); 23261da177e4SLinus Torvalds remaining -= delta; 23271da177e4SLinus Torvalds } 23281da177e4SLinus Torvalds if (remaining < 0) { 232955c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 233055c52718SAlan Stern - remaining); 23311da177e4SLinus Torvalds remaining = 0; 23321da177e4SLinus Torvalds } 23331da177e4SLinus Torvalds return remaining; 23341da177e4SLinus Torvalds } 23351da177e4SLinus Torvalds 23361da177e4SLinus Torvalds /* Handle physical or logical connection change events. 23371da177e4SLinus Torvalds * This routine is called when: 23381da177e4SLinus Torvalds * a port connection-change occurs; 23391da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 23401da177e4SLinus Torvalds * usb_reset_device() encounters changed descriptors (as from 23411da177e4SLinus Torvalds * a firmware download) 23421da177e4SLinus Torvalds * caller already locked the hub 23431da177e4SLinus Torvalds */ 23441da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 23451da177e4SLinus Torvalds u16 portstatus, u16 portchange) 23461da177e4SLinus Torvalds { 23471da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 23481da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 234974ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 23501da177e4SLinus Torvalds int status, i; 23511da177e4SLinus Torvalds 23521da177e4SLinus Torvalds dev_dbg (hub_dev, 23531da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 23541da177e4SLinus Torvalds port1, portstatus, portchange, portspeed (portstatus)); 23551da177e4SLinus Torvalds 23561da177e4SLinus Torvalds if (hub->has_indicators) { 23571da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 23581da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 23591da177e4SLinus Torvalds } 23601da177e4SLinus Torvalds 23611da177e4SLinus Torvalds /* Disconnect any existing devices under this port */ 23621da177e4SLinus Torvalds if (hdev->children[port1-1]) 23631da177e4SLinus Torvalds usb_disconnect(&hdev->children[port1-1]); 23641da177e4SLinus Torvalds clear_bit(port1, hub->change_bits); 23651da177e4SLinus Torvalds 23661da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 23671da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 23681da177e4SLinus Torvalds if (hdev->bus->is_b_host) 23691da177e4SLinus Torvalds portchange &= ~USB_PORT_STAT_C_CONNECTION; 23701da177e4SLinus Torvalds #endif 23711da177e4SLinus Torvalds 23721da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 23731da177e4SLinus Torvalds status = hub_port_debounce(hub, port1); 2374d4b7d8e8SAlan Stern if (status < 0) { 2375d4b7d8e8SAlan Stern if (printk_ratelimit()) 2376d4b7d8e8SAlan Stern dev_err (hub_dev, "connect-debounce failed, " 2377d4b7d8e8SAlan Stern "port %d disabled\n", port1); 23781da177e4SLinus Torvalds goto done; 23791da177e4SLinus Torvalds } 23801da177e4SLinus Torvalds portstatus = status; 23811da177e4SLinus Torvalds } 23821da177e4SLinus Torvalds 23831da177e4SLinus Torvalds /* Return now if nothing is connected */ 23841da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) { 23851da177e4SLinus Torvalds 23861da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 238774ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 23881da177e4SLinus Torvalds && !(portstatus & (1 << USB_PORT_FEAT_POWER))) 23891da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 23901da177e4SLinus Torvalds 23911da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 23921da177e4SLinus Torvalds goto done; 23931da177e4SLinus Torvalds return; 23941da177e4SLinus Torvalds } 23951da177e4SLinus Torvalds 23961da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 23971da177e4SLinus Torvalds struct usb_device *udev; 23981da177e4SLinus Torvalds 23991da177e4SLinus Torvalds /* reallocate for each attempt, since references 24001da177e4SLinus Torvalds * to the previous one can escape in various ways 24011da177e4SLinus Torvalds */ 24021da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 24031da177e4SLinus Torvalds if (!udev) { 24041da177e4SLinus Torvalds dev_err (hub_dev, 24051da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 24061da177e4SLinus Torvalds port1); 24071da177e4SLinus Torvalds goto done; 24081da177e4SLinus Torvalds } 24091da177e4SLinus Torvalds 24101da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 24111da177e4SLinus Torvalds udev->speed = USB_SPEED_UNKNOWN; 241255c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 2413b6956ffaSAlan Stern udev->level = hdev->level + 1; 24141da177e4SLinus Torvalds 24151da177e4SLinus Torvalds /* set the address */ 24161da177e4SLinus Torvalds choose_address(udev); 24171da177e4SLinus Torvalds if (udev->devnum <= 0) { 24181da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 24191da177e4SLinus Torvalds goto loop; 24201da177e4SLinus Torvalds } 24211da177e4SLinus Torvalds 24221da177e4SLinus Torvalds /* reset and get descriptor */ 24231da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 24241da177e4SLinus Torvalds if (status < 0) 24251da177e4SLinus Torvalds goto loop; 24261da177e4SLinus Torvalds 24271da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 24281da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 24291da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 24301da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 24311da177e4SLinus Torvalds * on the parent. 24321da177e4SLinus Torvalds */ 24331da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 243455c52718SAlan Stern && udev->bus_mA <= 100) { 24351da177e4SLinus Torvalds u16 devstat; 24361da177e4SLinus Torvalds 24371da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 24381da177e4SLinus Torvalds &devstat); 243955c52718SAlan Stern if (status < 2) { 24401da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 24411da177e4SLinus Torvalds goto loop_disable; 24421da177e4SLinus Torvalds } 244355c52718SAlan Stern le16_to_cpus(&devstat); 24441da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 24451da177e4SLinus Torvalds dev_err(&udev->dev, 24461da177e4SLinus Torvalds "can't connect bus-powered hub " 24471da177e4SLinus Torvalds "to this port\n"); 24481da177e4SLinus Torvalds if (hub->has_indicators) { 24491da177e4SLinus Torvalds hub->indicator[port1-1] = 24501da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 2451c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 24521da177e4SLinus Torvalds } 24531da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 24541da177e4SLinus Torvalds goto loop_disable; 24551da177e4SLinus Torvalds } 24561da177e4SLinus Torvalds } 24571da177e4SLinus Torvalds 24581da177e4SLinus Torvalds /* check for devices running slower than they could */ 24591da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 24601da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 24611da177e4SLinus Torvalds && highspeed_hubs != 0) 24621da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 24631da177e4SLinus Torvalds 24641da177e4SLinus Torvalds /* Store the parent's children[] pointer. At this point 24651da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 24661da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 24671da177e4SLinus Torvalds */ 24681da177e4SLinus Torvalds status = 0; 24691da177e4SLinus Torvalds 24701da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 24711da177e4SLinus Torvalds * been disconnected; we would race with the 24721da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 24731da177e4SLinus Torvalds */ 24741da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 24751da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 24761da177e4SLinus Torvalds status = -ENOTCONN; 24771da177e4SLinus Torvalds else 24781da177e4SLinus Torvalds hdev->children[port1-1] = udev; 24791da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 24801da177e4SLinus Torvalds 24811da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 24821da177e4SLinus Torvalds if (!status) { 24831da177e4SLinus Torvalds status = usb_new_device(udev); 24841da177e4SLinus Torvalds if (status) { 24851da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 24861da177e4SLinus Torvalds hdev->children[port1-1] = NULL; 24871da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 24881da177e4SLinus Torvalds } 24891da177e4SLinus Torvalds } 24901da177e4SLinus Torvalds 24911da177e4SLinus Torvalds if (status) 24921da177e4SLinus Torvalds goto loop_disable; 24931da177e4SLinus Torvalds 24941da177e4SLinus Torvalds status = hub_power_remaining(hub); 24951da177e4SLinus Torvalds if (status) 249655c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 24971da177e4SLinus Torvalds 24981da177e4SLinus Torvalds return; 24991da177e4SLinus Torvalds 25001da177e4SLinus Torvalds loop_disable: 25011da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 25021da177e4SLinus Torvalds loop: 25031da177e4SLinus Torvalds ep0_reinit(udev); 25041da177e4SLinus Torvalds release_address(udev); 25051da177e4SLinus Torvalds usb_put_dev(udev); 2506ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 25071da177e4SLinus Torvalds break; 25081da177e4SLinus Torvalds } 25091da177e4SLinus Torvalds 25101da177e4SLinus Torvalds done: 25111da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 25121da177e4SLinus Torvalds } 25131da177e4SLinus Torvalds 25141da177e4SLinus Torvalds static void hub_events(void) 25151da177e4SLinus Torvalds { 25161da177e4SLinus Torvalds struct list_head *tmp; 25171da177e4SLinus Torvalds struct usb_device *hdev; 25181da177e4SLinus Torvalds struct usb_interface *intf; 25191da177e4SLinus Torvalds struct usb_hub *hub; 25201da177e4SLinus Torvalds struct device *hub_dev; 25211da177e4SLinus Torvalds u16 hubstatus; 25221da177e4SLinus Torvalds u16 hubchange; 25231da177e4SLinus Torvalds u16 portstatus; 25241da177e4SLinus Torvalds u16 portchange; 25251da177e4SLinus Torvalds int i, ret; 25261da177e4SLinus Torvalds int connect_change; 25271da177e4SLinus Torvalds 25281da177e4SLinus Torvalds /* 25291da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 25301da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 25311da177e4SLinus Torvalds * safe since we delete the hub from the event list. 25321da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 25331da177e4SLinus Torvalds */ 25341da177e4SLinus Torvalds while (1) { 25351da177e4SLinus Torvalds 25361da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 25371da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 25381da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 25391da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 25401da177e4SLinus Torvalds break; 25411da177e4SLinus Torvalds } 25421da177e4SLinus Torvalds 25431da177e4SLinus Torvalds tmp = hub_event_list.next; 25441da177e4SLinus Torvalds list_del_init(tmp); 25451da177e4SLinus Torvalds 25461da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 2547e8054854SAlan Stern kref_get(&hub->kref); 2548e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 25491da177e4SLinus Torvalds 2550e8054854SAlan Stern hdev = hub->hdev; 2551e8054854SAlan Stern hub_dev = hub->intfdev; 2552e8054854SAlan Stern intf = to_usb_interface(hub_dev); 255340f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 25541da177e4SLinus Torvalds hdev->state, hub->descriptor 25551da177e4SLinus Torvalds ? hub->descriptor->bNbrPorts 25561da177e4SLinus Torvalds : 0, 25571da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 25581da177e4SLinus Torvalds (u16) hub->change_bits[0], 255940f122f3SAlan Stern (u16) hub->event_bits[0]); 25601da177e4SLinus Torvalds 25611da177e4SLinus Torvalds /* Lock the device, then check to see if we were 25621da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 256306b84e8aSAlan Stern usb_lock_device(hdev); 2564e8054854SAlan Stern if (unlikely(hub->disconnected)) 25651da177e4SLinus Torvalds goto loop; 25661da177e4SLinus Torvalds 25671da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 25681da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 25697de18d8bSAlan Stern hub->error = -ENODEV; 25707de18d8bSAlan Stern hub_pre_reset(intf); 25711da177e4SLinus Torvalds goto loop; 25721da177e4SLinus Torvalds } 25731da177e4SLinus Torvalds 257440f122f3SAlan Stern /* Autoresume */ 257540f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 257640f122f3SAlan Stern if (ret) { 257740f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 25781da177e4SLinus Torvalds goto loop; 257940f122f3SAlan Stern } 258040f122f3SAlan Stern 258140f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 258240f122f3SAlan Stern if (hub->quiescing) 258340f122f3SAlan Stern goto loop_autopm; 25841da177e4SLinus Torvalds 25851da177e4SLinus Torvalds if (hub->error) { 25861da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 25871da177e4SLinus Torvalds hub->error); 25881da177e4SLinus Torvalds 25897de18d8bSAlan Stern ret = usb_reset_composite_device(hdev, intf); 25901da177e4SLinus Torvalds if (ret) { 25911da177e4SLinus Torvalds dev_dbg (hub_dev, 25921da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 259340f122f3SAlan Stern goto loop_autopm; 25941da177e4SLinus Torvalds } 25951da177e4SLinus Torvalds 25961da177e4SLinus Torvalds hub->nerrors = 0; 25971da177e4SLinus Torvalds hub->error = 0; 25981da177e4SLinus Torvalds } 25991da177e4SLinus Torvalds 26001da177e4SLinus Torvalds /* deal with port status changes */ 26011da177e4SLinus Torvalds for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { 26021da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 26031da177e4SLinus Torvalds continue; 26041da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 26051da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 26061da177e4SLinus Torvalds !connect_change && !hub->activating) 26071da177e4SLinus Torvalds continue; 26081da177e4SLinus Torvalds 26091da177e4SLinus Torvalds ret = hub_port_status(hub, i, 26101da177e4SLinus Torvalds &portstatus, &portchange); 26111da177e4SLinus Torvalds if (ret < 0) 26121da177e4SLinus Torvalds continue; 26131da177e4SLinus Torvalds 26141da177e4SLinus Torvalds if (hub->activating && !hdev->children[i-1] && 26151da177e4SLinus Torvalds (portstatus & 26161da177e4SLinus Torvalds USB_PORT_STAT_CONNECTION)) 26171da177e4SLinus Torvalds connect_change = 1; 26181da177e4SLinus Torvalds 26191da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 26201da177e4SLinus Torvalds clear_port_feature(hdev, i, 26211da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 26221da177e4SLinus Torvalds connect_change = 1; 26231da177e4SLinus Torvalds } 26241da177e4SLinus Torvalds 26251da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 26261da177e4SLinus Torvalds if (!connect_change) 26271da177e4SLinus Torvalds dev_dbg (hub_dev, 26281da177e4SLinus Torvalds "port %d enable change, " 26291da177e4SLinus Torvalds "status %08x\n", 26301da177e4SLinus Torvalds i, portstatus); 26311da177e4SLinus Torvalds clear_port_feature(hdev, i, 26321da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 26331da177e4SLinus Torvalds 26341da177e4SLinus Torvalds /* 26351da177e4SLinus Torvalds * EM interference sometimes causes badly 26361da177e4SLinus Torvalds * shielded USB devices to be shutdown by 26371da177e4SLinus Torvalds * the hub, this hack enables them again. 26381da177e4SLinus Torvalds * Works at least with mouse driver. 26391da177e4SLinus Torvalds */ 26401da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 26411da177e4SLinus Torvalds && !connect_change 26421da177e4SLinus Torvalds && hdev->children[i-1]) { 26431da177e4SLinus Torvalds dev_err (hub_dev, 26441da177e4SLinus Torvalds "port %i " 26451da177e4SLinus Torvalds "disabled by hub (EMI?), " 26461da177e4SLinus Torvalds "re-enabling...\n", 26471da177e4SLinus Torvalds i); 26481da177e4SLinus Torvalds connect_change = 1; 26491da177e4SLinus Torvalds } 26501da177e4SLinus Torvalds } 26511da177e4SLinus Torvalds 26521da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_SUSPEND) { 26531da177e4SLinus Torvalds clear_port_feature(hdev, i, 26541da177e4SLinus Torvalds USB_PORT_FEAT_C_SUSPEND); 26551da177e4SLinus Torvalds if (hdev->children[i-1]) { 26561da177e4SLinus Torvalds ret = remote_wakeup(hdev-> 26571da177e4SLinus Torvalds children[i-1]); 26581da177e4SLinus Torvalds if (ret < 0) 26591da177e4SLinus Torvalds connect_change = 1; 26601da177e4SLinus Torvalds } else { 26611da177e4SLinus Torvalds ret = -ENODEV; 26621da177e4SLinus Torvalds hub_port_disable(hub, i, 1); 26631da177e4SLinus Torvalds } 26641da177e4SLinus Torvalds dev_dbg (hub_dev, 26651da177e4SLinus Torvalds "resume on port %d, status %d\n", 26661da177e4SLinus Torvalds i, ret); 26671da177e4SLinus Torvalds } 26681da177e4SLinus Torvalds 26691da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 26701da177e4SLinus Torvalds dev_err (hub_dev, 26711da177e4SLinus Torvalds "over-current change on port %d\n", 26721da177e4SLinus Torvalds i); 26731da177e4SLinus Torvalds clear_port_feature(hdev, i, 26741da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 26751da177e4SLinus Torvalds hub_power_on(hub); 26761da177e4SLinus Torvalds } 26771da177e4SLinus Torvalds 26781da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 26791da177e4SLinus Torvalds dev_dbg (hub_dev, 26801da177e4SLinus Torvalds "reset change on port %d\n", 26811da177e4SLinus Torvalds i); 26821da177e4SLinus Torvalds clear_port_feature(hdev, i, 26831da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 26841da177e4SLinus Torvalds } 26851da177e4SLinus Torvalds 26861da177e4SLinus Torvalds if (connect_change) 26871da177e4SLinus Torvalds hub_port_connect_change(hub, i, 26881da177e4SLinus Torvalds portstatus, portchange); 26891da177e4SLinus Torvalds } /* end for i */ 26901da177e4SLinus Torvalds 26911da177e4SLinus Torvalds /* deal with hub status changes */ 26921da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 26931da177e4SLinus Torvalds ; /* do nothing */ 26941da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 26951da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 26961da177e4SLinus Torvalds else { 26971da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 26981da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 26991da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 270055c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 270155c52718SAlan Stern /* FIXME: Is this always true? */ 270255c52718SAlan Stern hub->limited_power = 0; 270355c52718SAlan Stern else 270455c52718SAlan Stern hub->limited_power = 1; 27051da177e4SLinus Torvalds } 27061da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 27071da177e4SLinus Torvalds dev_dbg (hub_dev, "overcurrent change\n"); 27081da177e4SLinus Torvalds msleep(500); /* Cool down */ 27091da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 27101da177e4SLinus Torvalds hub_power_on(hub); 27111da177e4SLinus Torvalds } 27121da177e4SLinus Torvalds } 27131da177e4SLinus Torvalds 27141da177e4SLinus Torvalds hub->activating = 0; 27151da177e4SLinus Torvalds 2716d5926ae7SAlan Stern /* If this is a root hub, tell the HCD it's okay to 2717d5926ae7SAlan Stern * re-enable port-change interrupts now. */ 2718d5cbad4bSAlan Stern if (!hdev->parent && !hub->busy_bits[0]) 2719d5926ae7SAlan Stern usb_enable_root_hub_irq(hdev->bus); 2720d5926ae7SAlan Stern 272140f122f3SAlan Stern loop_autopm: 272240f122f3SAlan Stern /* Allow autosuspend if we're not going to run again */ 272340f122f3SAlan Stern if (list_empty(&hub->event_list)) 272440f122f3SAlan Stern usb_autopm_enable(intf); 27251da177e4SLinus Torvalds loop: 27261da177e4SLinus Torvalds usb_unlock_device(hdev); 2727e8054854SAlan Stern kref_put(&hub->kref, hub_release); 27281da177e4SLinus Torvalds 27291da177e4SLinus Torvalds } /* end while (1) */ 27301da177e4SLinus Torvalds } 27311da177e4SLinus Torvalds 27321da177e4SLinus Torvalds static int hub_thread(void *__unused) 27331da177e4SLinus Torvalds { 273483144186SRafael J. Wysocki set_freezable(); 27351da177e4SLinus Torvalds do { 27361da177e4SLinus Torvalds hub_events(); 27379c8d6178Sakpm@osdl.org wait_event_interruptible(khubd_wait, 27389c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 27399c8d6178Sakpm@osdl.org kthread_should_stop()); 27403e1d1d28SChristoph Lameter try_to_freeze(); 27419c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 27421da177e4SLinus Torvalds 27431da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 27449c8d6178Sakpm@osdl.org return 0; 27451da177e4SLinus Torvalds } 27461da177e4SLinus Torvalds 27471da177e4SLinus Torvalds static struct usb_device_id hub_id_table [] = { 27481da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 27491da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 27501da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 27511da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 27521da177e4SLinus Torvalds { } /* Terminating entry */ 27531da177e4SLinus Torvalds }; 27541da177e4SLinus Torvalds 27551da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 27561da177e4SLinus Torvalds 27571da177e4SLinus Torvalds static struct usb_driver hub_driver = { 27581da177e4SLinus Torvalds .name = "hub", 27591da177e4SLinus Torvalds .probe = hub_probe, 27601da177e4SLinus Torvalds .disconnect = hub_disconnect, 27611da177e4SLinus Torvalds .suspend = hub_suspend, 27621da177e4SLinus Torvalds .resume = hub_resume, 2763f07600cfSAlan Stern .reset_resume = hub_reset_resume, 27647de18d8bSAlan Stern .pre_reset = hub_pre_reset, 27657de18d8bSAlan Stern .post_reset = hub_post_reset, 27661da177e4SLinus Torvalds .ioctl = hub_ioctl, 27671da177e4SLinus Torvalds .id_table = hub_id_table, 276840f122f3SAlan Stern .supports_autosuspend = 1, 27691da177e4SLinus Torvalds }; 27701da177e4SLinus Torvalds 27711da177e4SLinus Torvalds int usb_hub_init(void) 27721da177e4SLinus Torvalds { 27731da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 27741da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 27751da177e4SLinus Torvalds usbcore_name); 27761da177e4SLinus Torvalds return -1; 27771da177e4SLinus Torvalds } 27781da177e4SLinus Torvalds 27799c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 27809c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 27811da177e4SLinus Torvalds return 0; 27821da177e4SLinus Torvalds 27831da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 27841da177e4SLinus Torvalds usb_deregister(&hub_driver); 27851da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 27861da177e4SLinus Torvalds 27871da177e4SLinus Torvalds return -1; 27881da177e4SLinus Torvalds } 27891da177e4SLinus Torvalds 27901da177e4SLinus Torvalds void usb_hub_cleanup(void) 27911da177e4SLinus Torvalds { 27929c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 27931da177e4SLinus Torvalds 27941da177e4SLinus Torvalds /* 27951da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 27961da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 27971da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 27981da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 27991da177e4SLinus Torvalds * individual hub resources. -greg 28001da177e4SLinus Torvalds */ 28011da177e4SLinus Torvalds usb_deregister(&hub_driver); 28021da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 28031da177e4SLinus Torvalds 28041da177e4SLinus Torvalds static int config_descriptors_changed(struct usb_device *udev) 28051da177e4SLinus Torvalds { 28061da177e4SLinus Torvalds unsigned index; 28071da177e4SLinus Torvalds unsigned len = 0; 28081da177e4SLinus Torvalds struct usb_config_descriptor *buf; 28091da177e4SLinus Torvalds 28101da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 28111da177e4SLinus Torvalds if (len < le16_to_cpu(udev->config[index].desc.wTotalLength)) 28121da177e4SLinus Torvalds len = le16_to_cpu(udev->config[index].desc.wTotalLength); 28131da177e4SLinus Torvalds } 2814e94b1766SChristoph Lameter buf = kmalloc (len, GFP_KERNEL); 28151da177e4SLinus Torvalds if (buf == NULL) { 28161da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 28171da177e4SLinus Torvalds /* assume the worst */ 28181da177e4SLinus Torvalds return 1; 28191da177e4SLinus Torvalds } 28201da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 28211da177e4SLinus Torvalds int length; 28221da177e4SLinus Torvalds int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 28231da177e4SLinus Torvalds 28241da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 28251da177e4SLinus Torvalds old_length); 28261da177e4SLinus Torvalds if (length < old_length) { 28271da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 28281da177e4SLinus Torvalds index, length); 28291da177e4SLinus Torvalds break; 28301da177e4SLinus Torvalds } 28311da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 28321da177e4SLinus Torvalds != 0) { 28331da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 28341da177e4SLinus Torvalds index, buf->bConfigurationValue); 28351da177e4SLinus Torvalds break; 28361da177e4SLinus Torvalds } 28371da177e4SLinus Torvalds } 28381da177e4SLinus Torvalds kfree(buf); 28391da177e4SLinus Torvalds return index != udev->descriptor.bNumConfigurations; 28401da177e4SLinus Torvalds } 28411da177e4SLinus Torvalds 28421da177e4SLinus Torvalds /** 28431da177e4SLinus Torvalds * usb_reset_device - perform a USB port reset to reinitialize a device 28441da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 28451da177e4SLinus Torvalds * 284679efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 284779efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 284879efa097SAlan Stern * Use usb_reset_composite_device() instead. 28491da177e4SLinus Torvalds * 28501da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 28511da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 28521da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 28531da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 28541da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 28551da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 28561da177e4SLinus Torvalds * re-enumerated and probed all over again. 28571da177e4SLinus Torvalds * 28581da177e4SLinus Torvalds * Returns 0 if the reset succeeded, -ENODEV if the device has been 28591da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 28601da177e4SLinus Torvalds * if the reset wasn't even attempted. 28611da177e4SLinus Torvalds * 28621da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 28631da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 28641da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 28651da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 28666bc6cff5SAlan Stern * 28676bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 28686bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 28696bc6cff5SAlan Stern * holding the device lock because these tasks should always call 28706bc6cff5SAlan Stern * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. 28711da177e4SLinus Torvalds */ 28721da177e4SLinus Torvalds int usb_reset_device(struct usb_device *udev) 28731da177e4SLinus Torvalds { 28741da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 28751da177e4SLinus Torvalds struct usb_hub *parent_hub; 28761da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 287712c3da34SAlan Stern int i, ret = 0; 287812c3da34SAlan Stern int port1 = udev->portnum; 28791da177e4SLinus Torvalds 28801da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 28811da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 28821da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 28831da177e4SLinus Torvalds udev->state); 28841da177e4SLinus Torvalds return -EINVAL; 28851da177e4SLinus Torvalds } 28861da177e4SLinus Torvalds 28871da177e4SLinus Torvalds if (!parent_hdev) { 28881da177e4SLinus Torvalds /* this requires hcd-specific logic; see OHCI hc_restart() */ 28891da177e4SLinus Torvalds dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__); 28901da177e4SLinus Torvalds return -EISDIR; 28911da177e4SLinus Torvalds } 28921da177e4SLinus Torvalds parent_hub = hdev_to_hub(parent_hdev); 28931da177e4SLinus Torvalds 28941da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 28951da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 28961da177e4SLinus Torvalds 28971da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 28981da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 28991da177e4SLinus Torvalds ep0_reinit(udev); 29001da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 2901dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 29021da177e4SLinus Torvalds break; 29031da177e4SLinus Torvalds } 29041da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 2905d5cbad4bSAlan Stern if (!parent_hdev->parent && !parent_hub->busy_bits[0]) 2906d5cbad4bSAlan Stern usb_enable_root_hub_irq(parent_hdev->bus); 2907d5cbad4bSAlan Stern 29081da177e4SLinus Torvalds if (ret < 0) 29091da177e4SLinus Torvalds goto re_enumerate; 29101da177e4SLinus Torvalds 29111da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 29121da177e4SLinus Torvalds if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor) 29131da177e4SLinus Torvalds || config_descriptors_changed (udev)) { 29141da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 29151da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 29161da177e4SLinus Torvalds goto re_enumerate; 29171da177e4SLinus Torvalds } 29181da177e4SLinus Torvalds 29191da177e4SLinus Torvalds if (!udev->actconfig) 29201da177e4SLinus Torvalds goto done; 29211da177e4SLinus Torvalds 29221da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 29231da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 29241da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 29251da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 29261da177e4SLinus Torvalds if (ret < 0) { 29271da177e4SLinus Torvalds dev_err(&udev->dev, 29281da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 29291da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 29301da177e4SLinus Torvalds goto re_enumerate; 29311da177e4SLinus Torvalds } 29321da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 29331da177e4SLinus Torvalds 29341da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 29351da177e4SLinus Torvalds struct usb_interface *intf = udev->actconfig->interface[i]; 29361da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 29371da177e4SLinus Torvalds 29381da177e4SLinus Torvalds /* set_interface resets host side toggle even 29391da177e4SLinus Torvalds * for altsetting zero. the interface may have no driver. 29401da177e4SLinus Torvalds */ 29411da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 29421da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 29431da177e4SLinus Torvalds desc->bAlternateSetting); 29441da177e4SLinus Torvalds if (ret < 0) { 29451da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 29461da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 29471da177e4SLinus Torvalds desc->bInterfaceNumber, 29481da177e4SLinus Torvalds desc->bAlternateSetting, 29491da177e4SLinus Torvalds ret); 29501da177e4SLinus Torvalds goto re_enumerate; 29511da177e4SLinus Torvalds } 29521da177e4SLinus Torvalds } 29531da177e4SLinus Torvalds 29541da177e4SLinus Torvalds done: 29551da177e4SLinus Torvalds return 0; 29561da177e4SLinus Torvalds 29571da177e4SLinus Torvalds re_enumerate: 29581da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 29591da177e4SLinus Torvalds return -ENODEV; 29601da177e4SLinus Torvalds } 2961140d8f68SAlan Stern EXPORT_SYMBOL(usb_reset_device); 296279efa097SAlan Stern 296379efa097SAlan Stern /** 296479efa097SAlan Stern * usb_reset_composite_device - warn interface drivers and perform a USB port reset 296579efa097SAlan Stern * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 296679efa097SAlan Stern * @iface: interface bound to the driver making the request (optional) 296779efa097SAlan Stern * 296879efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 296979efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 297079efa097SAlan Stern * the reset is over (using their post_reset method). 297179efa097SAlan Stern * 297279efa097SAlan Stern * Return value is the same as for usb_reset_device(). 297379efa097SAlan Stern * 297479efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 297579efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 297679efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 297779efa097SAlan Stern * the device using usb_lock_device_for_reset(). 297879efa097SAlan Stern * 297979efa097SAlan Stern * The interface locks are acquired during the pre_reset stage and released 298079efa097SAlan Stern * during the post_reset stage. However if iface is not NULL and is 298179efa097SAlan Stern * currently being probed, we assume that the caller already owns its 298279efa097SAlan Stern * lock. 298379efa097SAlan Stern */ 298479efa097SAlan Stern int usb_reset_composite_device(struct usb_device *udev, 298579efa097SAlan Stern struct usb_interface *iface) 298679efa097SAlan Stern { 298779efa097SAlan Stern int ret; 298879efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 298979efa097SAlan Stern 299079efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 299179efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 299279efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 299379efa097SAlan Stern udev->state); 299479efa097SAlan Stern return -EINVAL; 299579efa097SAlan Stern } 299679efa097SAlan Stern 2997645daaabSAlan Stern /* Prevent autosuspend during the reset */ 299894fcda1fSAlan Stern usb_autoresume_device(udev); 2999645daaabSAlan Stern 300079efa097SAlan Stern if (iface && iface->condition != USB_INTERFACE_BINDING) 300179efa097SAlan Stern iface = NULL; 300279efa097SAlan Stern 300379efa097SAlan Stern if (config) { 300479efa097SAlan Stern int i; 300579efa097SAlan Stern struct usb_interface *cintf; 300679efa097SAlan Stern struct usb_driver *drv; 300779efa097SAlan Stern 300879efa097SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 300979efa097SAlan Stern cintf = config->interface[i]; 301079efa097SAlan Stern if (cintf != iface) 301179efa097SAlan Stern down(&cintf->dev.sem); 301279efa097SAlan Stern if (device_is_registered(&cintf->dev) && 301379efa097SAlan Stern cintf->dev.driver) { 301479efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 301579efa097SAlan Stern if (drv->pre_reset) 301679efa097SAlan Stern (drv->pre_reset)(cintf); 3017f07600cfSAlan Stern /* FIXME: Unbind if pre_reset returns an error or isn't defined */ 301879efa097SAlan Stern } 301979efa097SAlan Stern } 302079efa097SAlan Stern } 302179efa097SAlan Stern 302279efa097SAlan Stern ret = usb_reset_device(udev); 302379efa097SAlan Stern 302479efa097SAlan Stern if (config) { 302579efa097SAlan Stern int i; 302679efa097SAlan Stern struct usb_interface *cintf; 302779efa097SAlan Stern struct usb_driver *drv; 302879efa097SAlan Stern 302979efa097SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 303079efa097SAlan Stern cintf = config->interface[i]; 303179efa097SAlan Stern if (device_is_registered(&cintf->dev) && 303279efa097SAlan Stern cintf->dev.driver) { 303379efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 303479efa097SAlan Stern if (drv->post_reset) 3035f07600cfSAlan Stern (drv->post_reset)(cintf); 3036f07600cfSAlan Stern /* FIXME: Unbind if post_reset returns an error or isn't defined */ 303779efa097SAlan Stern } 303879efa097SAlan Stern if (cintf != iface) 303979efa097SAlan Stern up(&cintf->dev.sem); 304079efa097SAlan Stern } 304179efa097SAlan Stern } 304279efa097SAlan Stern 304394fcda1fSAlan Stern usb_autosuspend_device(udev); 304479efa097SAlan Stern return ret; 304579efa097SAlan Stern } 3046140d8f68SAlan Stern EXPORT_SYMBOL(usb_reset_composite_device); 3047