11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * USB hub driver. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * (C) Copyright 1999 Linus Torvalds 51da177e4SLinus Torvalds * (C) Copyright 1999 Johannes Erdfelt 61da177e4SLinus Torvalds * (C) Copyright 1999 Gregory P. Smith 71da177e4SLinus Torvalds * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds 111da177e4SLinus Torvalds #include <linux/kernel.h> 121da177e4SLinus Torvalds #include <linux/errno.h> 131da177e4SLinus Torvalds #include <linux/module.h> 141da177e4SLinus Torvalds #include <linux/moduleparam.h> 151da177e4SLinus Torvalds #include <linux/completion.h> 161da177e4SLinus Torvalds #include <linux/sched.h> 171da177e4SLinus Torvalds #include <linux/list.h> 181da177e4SLinus Torvalds #include <linux/slab.h> 191da177e4SLinus Torvalds #include <linux/smp_lock.h> 201da177e4SLinus Torvalds #include <linux/ioctl.h> 211da177e4SLinus Torvalds #include <linux/usb.h> 221da177e4SLinus Torvalds #include <linux/usbdevice_fs.h> 239c8d6178Sakpm@osdl.org #include <linux/kthread.h> 244186ecf8SArjan van de Ven #include <linux/mutex.h> 257dfb7103SNigel Cunningham #include <linux/freezer.h> 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds #include <asm/semaphore.h> 281da177e4SLinus Torvalds #include <asm/uaccess.h> 291da177e4SLinus Torvalds #include <asm/byteorder.h> 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #include "usb.h" 321da177e4SLinus Torvalds #include "hcd.h" 331da177e4SLinus Torvalds #include "hub.h" 341da177e4SLinus Torvalds 351bb5f66bSAlan Stern struct usb_hub { 361bb5f66bSAlan Stern struct device *intfdev; /* the "interface" device */ 371bb5f66bSAlan Stern struct usb_device *hdev; 381bb5f66bSAlan Stern struct urb *urb; /* for interrupt polling pipe */ 391bb5f66bSAlan Stern 401bb5f66bSAlan Stern /* buffer for urb ... with extra space in case of babble */ 411bb5f66bSAlan Stern char (*buffer)[8]; 421bb5f66bSAlan Stern dma_addr_t buffer_dma; /* DMA address for buffer */ 431bb5f66bSAlan Stern union { 441bb5f66bSAlan Stern struct usb_hub_status hub; 451bb5f66bSAlan Stern struct usb_port_status port; 461bb5f66bSAlan Stern } *status; /* buffer for status reports */ 47db90e7a1SAlan Stern struct mutex status_mutex; /* for the status buffer */ 481bb5f66bSAlan Stern 491bb5f66bSAlan Stern int error; /* last reported error */ 501bb5f66bSAlan Stern int nerrors; /* track consecutive errors */ 511bb5f66bSAlan Stern 521bb5f66bSAlan Stern struct list_head event_list; /* hubs w/data or errs ready */ 531bb5f66bSAlan Stern unsigned long event_bits[1]; /* status change bitmask */ 541bb5f66bSAlan Stern unsigned long change_bits[1]; /* ports with logical connect 551bb5f66bSAlan Stern status change */ 561bb5f66bSAlan Stern unsigned long busy_bits[1]; /* ports being reset or 571bb5f66bSAlan Stern resumed */ 581bb5f66bSAlan Stern #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ 591bb5f66bSAlan Stern #error event_bits[] is too short! 601bb5f66bSAlan Stern #endif 611bb5f66bSAlan Stern 621bb5f66bSAlan Stern struct usb_hub_descriptor *descriptor; /* class descriptor */ 631bb5f66bSAlan Stern struct usb_tt tt; /* Transaction Translator */ 641bb5f66bSAlan Stern 651bb5f66bSAlan Stern unsigned mA_per_port; /* current for each child */ 661bb5f66bSAlan Stern 671bb5f66bSAlan Stern unsigned limited_power:1; 681bb5f66bSAlan Stern unsigned quiescing:1; 691bb5f66bSAlan Stern unsigned activating:1; 701bb5f66bSAlan Stern 711bb5f66bSAlan Stern unsigned has_indicators:1; 721bb5f66bSAlan Stern u8 indicator[USB_MAXCHILDREN]; 736d5aefb8SDavid Howells struct delayed_work leds; 741bb5f66bSAlan Stern }; 751bb5f66bSAlan Stern 761bb5f66bSAlan Stern 771da177e4SLinus Torvalds /* Protect struct usb_device->state and ->children members 789ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 791da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 801da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds /* khubd's worklist and its lock */ 831da177e4SLinus Torvalds static DEFINE_SPINLOCK(hub_event_lock); 841da177e4SLinus Torvalds static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds /* Wakes up khubd */ 871da177e4SLinus Torvalds static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); 881da177e4SLinus Torvalds 899c8d6178Sakpm@osdl.org static struct task_struct *khubd_task; 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 921da177e4SLinus Torvalds static int blinkenlights = 0; 931da177e4SLinus Torvalds module_param (blinkenlights, bool, S_IRUGO); 941da177e4SLinus Torvalds MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds /* 971da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 981da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 991da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 1001da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 1011da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 1021da177e4SLinus Torvalds * following module parameters. 1031da177e4SLinus Torvalds * 1041da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 1051da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 1061da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 1071da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 1081da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 1091da177e4SLinus Torvalds */ 1101da177e4SLinus Torvalds static int old_scheme_first = 0; 1111da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 1121da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 1131da177e4SLinus Torvalds "start with the old device initialization scheme"); 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds static int use_both_schemes = 1; 1161da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 1171da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 1181da177e4SLinus Torvalds "try the other device initialization scheme if the " 1191da177e4SLinus Torvalds "first one fails"); 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds #ifdef DEBUG 1231da177e4SLinus Torvalds static inline char *portspeed (int portstatus) 1241da177e4SLinus Torvalds { 1251da177e4SLinus Torvalds if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) 1261da177e4SLinus Torvalds return "480 Mb/s"; 1271da177e4SLinus Torvalds else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) 1281da177e4SLinus Torvalds return "1.5 Mb/s"; 1291da177e4SLinus Torvalds else 1301da177e4SLinus Torvalds return "12 Mb/s"; 1311da177e4SLinus Torvalds } 1321da177e4SLinus Torvalds #endif 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 1351da177e4SLinus Torvalds static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev) 1361da177e4SLinus Torvalds { 1371da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1381da177e4SLinus Torvalds } 1391da177e4SLinus Torvalds 1401da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 1411da177e4SLinus Torvalds static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) 1421da177e4SLinus Torvalds { 1431da177e4SLinus Torvalds int i, ret; 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 1461da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 1471da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 1481da177e4SLinus Torvalds USB_DT_HUB << 8, 0, data, size, 1491da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 1501da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 1511da177e4SLinus Torvalds return ret; 1521da177e4SLinus Torvalds } 1531da177e4SLinus Torvalds return -EINVAL; 1541da177e4SLinus Torvalds } 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds /* 1571da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 1581da177e4SLinus Torvalds */ 1591da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 1601da177e4SLinus Torvalds { 1611da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1621da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 1631da177e4SLinus Torvalds } 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds /* 1661da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 1671da177e4SLinus Torvalds */ 1681da177e4SLinus Torvalds static int clear_port_feature(struct usb_device *hdev, int port1, int feature) 1691da177e4SLinus Torvalds { 1701da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1711da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 1721da177e4SLinus Torvalds NULL, 0, 1000); 1731da177e4SLinus Torvalds } 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds /* 1761da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 1771da177e4SLinus Torvalds */ 1781da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 1791da177e4SLinus Torvalds { 1801da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1811da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 1821da177e4SLinus Torvalds NULL, 0, 1000); 1831da177e4SLinus Torvalds } 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds /* 1861da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 1871da177e4SLinus Torvalds * for info about using port indicators 1881da177e4SLinus Torvalds */ 1891da177e4SLinus Torvalds static void set_port_led( 1901da177e4SLinus Torvalds struct usb_hub *hub, 1911da177e4SLinus Torvalds int port1, 1921da177e4SLinus Torvalds int selector 1931da177e4SLinus Torvalds ) 1941da177e4SLinus Torvalds { 1951da177e4SLinus Torvalds int status = set_port_feature(hub->hdev, (selector << 8) | port1, 1961da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 1971da177e4SLinus Torvalds if (status < 0) 1981da177e4SLinus Torvalds dev_dbg (hub->intfdev, 1991da177e4SLinus Torvalds "port %d indicator %s status %d\n", 2001da177e4SLinus Torvalds port1, 2011da177e4SLinus Torvalds ({ char *s; switch (selector) { 2021da177e4SLinus Torvalds case HUB_LED_AMBER: s = "amber"; break; 2031da177e4SLinus Torvalds case HUB_LED_GREEN: s = "green"; break; 2041da177e4SLinus Torvalds case HUB_LED_OFF: s = "off"; break; 2051da177e4SLinus Torvalds case HUB_LED_AUTO: s = "auto"; break; 2061da177e4SLinus Torvalds default: s = "??"; break; 2071da177e4SLinus Torvalds }; s; }), 2081da177e4SLinus Torvalds status); 2091da177e4SLinus Torvalds } 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 2121da177e4SLinus Torvalds 213c4028958SDavid Howells static void led_work (struct work_struct *work) 2141da177e4SLinus Torvalds { 215c4028958SDavid Howells struct usb_hub *hub = 216c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 2171da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 2181da177e4SLinus Torvalds unsigned i; 2191da177e4SLinus Torvalds unsigned changed = 0; 2201da177e4SLinus Torvalds int cursor = -1; 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 2231da177e4SLinus Torvalds return; 2241da177e4SLinus Torvalds 2251da177e4SLinus Torvalds for (i = 0; i < hub->descriptor->bNbrPorts; i++) { 2261da177e4SLinus Torvalds unsigned selector, mode; 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds /* 30%-50% duty cycle */ 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds switch (hub->indicator[i]) { 2311da177e4SLinus Torvalds /* cycle marker */ 2321da177e4SLinus Torvalds case INDICATOR_CYCLE: 2331da177e4SLinus Torvalds cursor = i; 2341da177e4SLinus Torvalds selector = HUB_LED_AUTO; 2351da177e4SLinus Torvalds mode = INDICATOR_AUTO; 2361da177e4SLinus Torvalds break; 2371da177e4SLinus Torvalds /* blinking green = sw attention */ 2381da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 2391da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2401da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 2411da177e4SLinus Torvalds break; 2421da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 2431da177e4SLinus Torvalds selector = HUB_LED_OFF; 2441da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 2451da177e4SLinus Torvalds break; 2461da177e4SLinus Torvalds /* blinking amber = hw attention */ 2471da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 2481da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2491da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 2501da177e4SLinus Torvalds break; 2511da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 2521da177e4SLinus Torvalds selector = HUB_LED_OFF; 2531da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 2541da177e4SLinus Torvalds break; 2551da177e4SLinus Torvalds /* blink green/amber = reserved */ 2561da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 2571da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2581da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 2591da177e4SLinus Torvalds break; 2601da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 2611da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2621da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 2631da177e4SLinus Torvalds break; 2641da177e4SLinus Torvalds default: 2651da177e4SLinus Torvalds continue; 2661da177e4SLinus Torvalds } 2671da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 2681da177e4SLinus Torvalds changed = 1; 2691da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 2701da177e4SLinus Torvalds hub->indicator[i] = mode; 2711da177e4SLinus Torvalds } 2721da177e4SLinus Torvalds if (!changed && blinkenlights) { 2731da177e4SLinus Torvalds cursor++; 2741da177e4SLinus Torvalds cursor %= hub->descriptor->bNbrPorts; 2751da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 2761da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 2771da177e4SLinus Torvalds changed++; 2781da177e4SLinus Torvalds } 2791da177e4SLinus Torvalds if (changed) 2801da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 2811da177e4SLinus Torvalds } 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 2841da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 2851da177e4SLinus Torvalds #define USB_STS_RETRIES 5 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds /* 2881da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 2891da177e4SLinus Torvalds */ 2901da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 2911da177e4SLinus Torvalds struct usb_hub_status *data) 2921da177e4SLinus Torvalds { 2931da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 2961da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 2971da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 2981da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 2991da177e4SLinus Torvalds } 3001da177e4SLinus Torvalds return status; 3011da177e4SLinus Torvalds } 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds /* 3041da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 3051da177e4SLinus Torvalds */ 3061da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 3071da177e4SLinus Torvalds struct usb_port_status *data) 3081da177e4SLinus Torvalds { 3091da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 3121da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3131da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 3141da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 3151da177e4SLinus Torvalds } 3161da177e4SLinus Torvalds return status; 3171da177e4SLinus Torvalds } 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds static void kick_khubd(struct usb_hub *hub) 3201da177e4SLinus Torvalds { 3211da177e4SLinus Torvalds unsigned long flags; 3221da177e4SLinus Torvalds 32340f122f3SAlan Stern /* Suppress autosuspend until khubd runs */ 32440f122f3SAlan Stern to_usb_interface(hub->intfdev)->pm_usage_cnt = 1; 32540f122f3SAlan Stern 3261da177e4SLinus Torvalds spin_lock_irqsave(&hub_event_lock, flags); 3271da177e4SLinus Torvalds if (list_empty(&hub->event_list)) { 3281da177e4SLinus Torvalds list_add_tail(&hub->event_list, &hub_event_list); 3291da177e4SLinus Torvalds wake_up(&khubd_wait); 3301da177e4SLinus Torvalds } 3311da177e4SLinus Torvalds spin_unlock_irqrestore(&hub_event_lock, flags); 3321da177e4SLinus Torvalds } 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvalds void usb_kick_khubd(struct usb_device *hdev) 3351da177e4SLinus Torvalds { 3361da177e4SLinus Torvalds kick_khubd(hdev_to_hub(hdev)); 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 3417d12e780SDavid Howells static void hub_irq(struct urb *urb) 3421da177e4SLinus Torvalds { 343ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 3441da177e4SLinus Torvalds int status; 3451da177e4SLinus Torvalds int i; 3461da177e4SLinus Torvalds unsigned long bits; 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds switch (urb->status) { 3491da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 3501da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 3511da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 3521da177e4SLinus Torvalds return; 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds default: /* presumably an error */ 3551da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 3561da177e4SLinus Torvalds dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status); 3571da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 3581da177e4SLinus Torvalds goto resubmit; 3591da177e4SLinus Torvalds hub->error = urb->status; 3601da177e4SLinus Torvalds /* FALL THROUGH */ 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds /* let khubd handle things */ 3631da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 3641da177e4SLinus Torvalds bits = 0; 3651da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 3661da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 3671da177e4SLinus Torvalds << (i*8); 3681da177e4SLinus Torvalds hub->event_bits[0] = bits; 3691da177e4SLinus Torvalds break; 3701da177e4SLinus Torvalds } 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds hub->nerrors = 0; 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds /* Something happened, let khubd figure it out */ 3751da177e4SLinus Torvalds kick_khubd(hub); 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds resubmit: 3781da177e4SLinus Torvalds if (hub->quiescing) 3791da177e4SLinus Torvalds return; 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 3821da177e4SLinus Torvalds && status != -ENODEV && status != -EPERM) 3831da177e4SLinus Torvalds dev_err (hub->intfdev, "resubmit --> %d\n", status); 3841da177e4SLinus Torvalds } 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 3871da177e4SLinus Torvalds static inline int 3881da177e4SLinus Torvalds hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) 3891da177e4SLinus Torvalds { 3901da177e4SLinus Torvalds return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3911da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 3921da177e4SLinus Torvalds tt, NULL, 0, 1000); 3931da177e4SLinus Torvalds } 3941da177e4SLinus Torvalds 3951da177e4SLinus Torvalds /* 3961da177e4SLinus Torvalds * enumeration blocks khubd for a long time. we use keventd instead, since 3971da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 3981da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 3991da177e4SLinus Torvalds * both can talk to the same hub concurrently. 4001da177e4SLinus Torvalds */ 401c4028958SDavid Howells static void hub_tt_kevent (struct work_struct *work) 4021da177e4SLinus Torvalds { 403c4028958SDavid Howells struct usb_hub *hub = 404c4028958SDavid Howells container_of(work, struct usb_hub, tt.kevent); 4051da177e4SLinus Torvalds unsigned long flags; 4061da177e4SLinus Torvalds 4071da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 4081da177e4SLinus Torvalds while (!list_empty (&hub->tt.clear_list)) { 4091da177e4SLinus Torvalds struct list_head *temp; 4101da177e4SLinus Torvalds struct usb_tt_clear *clear; 4111da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4121da177e4SLinus Torvalds int status; 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds temp = hub->tt.clear_list.next; 4151da177e4SLinus Torvalds clear = list_entry (temp, struct usb_tt_clear, clear_list); 4161da177e4SLinus Torvalds list_del (&clear->clear_list); 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 4191da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 4201da177e4SLinus Torvalds status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 4211da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds if (status) 4241da177e4SLinus Torvalds dev_err (&hdev->dev, 4251da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 4261da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 4271da177e4SLinus Torvalds kfree(clear); 4281da177e4SLinus Torvalds } 4291da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds /** 4331da177e4SLinus Torvalds * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub 4341da177e4SLinus Torvalds * @udev: the device whose split transaction failed 4351da177e4SLinus Torvalds * @pipe: identifies the endpoint of the failed transaction 4361da177e4SLinus Torvalds * 4371da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 4381da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 4391da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 4401da177e4SLinus Torvalds * interrupt context. 4411da177e4SLinus Torvalds * 4421da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 4431da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 4441da177e4SLinus Torvalds */ 4451da177e4SLinus Torvalds void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe) 4461da177e4SLinus Torvalds { 4471da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 4481da177e4SLinus Torvalds unsigned long flags; 4491da177e4SLinus Torvalds struct usb_tt_clear *clear; 4501da177e4SLinus Torvalds 4511da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 4521da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 4531da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 4541da177e4SLinus Torvalds */ 45554e6ecb2SChristoph Lameter if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { 4561da177e4SLinus Torvalds dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 4571da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 4581da177e4SLinus Torvalds return; 4591da177e4SLinus Torvalds } 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 4621da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 4631da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 4641da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 4651da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol (pipe) 4661da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 4671da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 4681da177e4SLinus Torvalds if (usb_pipein (pipe)) 4691da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 4701da177e4SLinus Torvalds 4711da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 4721da177e4SLinus Torvalds spin_lock_irqsave (&tt->lock, flags); 4731da177e4SLinus Torvalds list_add_tail (&clear->clear_list, &tt->clear_list); 4741da177e4SLinus Torvalds schedule_work (&tt->kevent); 4751da177e4SLinus Torvalds spin_unlock_irqrestore (&tt->lock, flags); 4761da177e4SLinus Torvalds } 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds static void hub_power_on(struct usb_hub *hub) 4791da177e4SLinus Torvalds { 4801da177e4SLinus Torvalds int port1; 481b789696aSDavid Brownell unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 4824489a571SAlan Stern u16 wHubCharacteristics = 4834489a571SAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 4841da177e4SLinus Torvalds 4854489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 4864489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 4874489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 4884489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 4894489a571SAlan Stern * unless we send these messages to the hub. 4904489a571SAlan Stern */ 4914489a571SAlan Stern if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) 4921da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 4934489a571SAlan Stern else 4944489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 4954489a571SAlan Stern "non-switchable hub\n"); 4961da177e4SLinus Torvalds for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) 4974489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 4981da177e4SLinus Torvalds 499b789696aSDavid Brownell /* Wait at least 100 msec for power to become stable */ 500b789696aSDavid Brownell msleep(max(pgood_delay, (unsigned) 100)); 5011da177e4SLinus Torvalds } 5021da177e4SLinus Torvalds 50302c399eeSAlan Stern static void hub_quiesce(struct usb_hub *hub) 5041da177e4SLinus Torvalds { 505979d5199SDavid Brownell /* (nonblocking) khubd and related activity won't re-trigger */ 5061da177e4SLinus Torvalds hub->quiescing = 1; 507c9f89fa4SDavid Brownell hub->activating = 0; 508979d5199SDavid Brownell 509979d5199SDavid Brownell /* (blocking) stop khubd and related activity */ 5101da177e4SLinus Torvalds usb_kill_urb(hub->urb); 5111da177e4SLinus Torvalds if (hub->has_indicators) 5121da177e4SLinus Torvalds cancel_delayed_work(&hub->leds); 5131da177e4SLinus Torvalds if (hub->has_indicators || hub->tt.hub) 5141da177e4SLinus Torvalds flush_scheduled_work(); 5151da177e4SLinus Torvalds } 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds static void hub_activate(struct usb_hub *hub) 5181da177e4SLinus Torvalds { 5191da177e4SLinus Torvalds int status; 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds hub->quiescing = 0; 5221da177e4SLinus Torvalds hub->activating = 1; 52340f122f3SAlan Stern 5241da177e4SLinus Torvalds status = usb_submit_urb(hub->urb, GFP_NOIO); 5251da177e4SLinus Torvalds if (status < 0) 5261da177e4SLinus Torvalds dev_err(hub->intfdev, "activate --> %d\n", status); 5271da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 5281da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 5291da177e4SLinus Torvalds 5301da177e4SLinus Torvalds /* scan all ports ASAP */ 5311da177e4SLinus Torvalds kick_khubd(hub); 5321da177e4SLinus Torvalds } 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 5351da177e4SLinus Torvalds u16 *status, u16 *change) 5361da177e4SLinus Torvalds { 5371da177e4SLinus Torvalds int ret; 5381da177e4SLinus Torvalds 539db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 5401da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 5411da177e4SLinus Torvalds if (ret < 0) 5421da177e4SLinus Torvalds dev_err (hub->intfdev, 5431da177e4SLinus Torvalds "%s failed (err = %d)\n", __FUNCTION__, ret); 5441da177e4SLinus Torvalds else { 5451da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 5461da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 5471da177e4SLinus Torvalds ret = 0; 5481da177e4SLinus Torvalds } 549db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 5501da177e4SLinus Torvalds return ret; 5511da177e4SLinus Torvalds } 5521da177e4SLinus Torvalds 5538b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 5548b28c752SAlan Stern { 5558b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 5568b28c752SAlan Stern int ret; 5578b28c752SAlan Stern 5588b28c752SAlan Stern if (hdev->children[port1-1] && set_state) { 5598b28c752SAlan Stern usb_set_device_state(hdev->children[port1-1], 5608b28c752SAlan Stern USB_STATE_NOTATTACHED); 5618b28c752SAlan Stern } 5628b28c752SAlan Stern ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); 5638b28c752SAlan Stern if (ret) 5648b28c752SAlan Stern dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 5658b28c752SAlan Stern port1, ret); 5668b28c752SAlan Stern 5678b28c752SAlan Stern return ret; 5688b28c752SAlan Stern } 5698b28c752SAlan Stern 5707d069b7dSAlan Stern 5717d069b7dSAlan Stern /* caller has locked the hub device */ 5727de18d8bSAlan Stern static void hub_pre_reset(struct usb_interface *intf) 5737d069b7dSAlan Stern { 5747de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 5757d069b7dSAlan Stern struct usb_device *hdev = hub->hdev; 5767d069b7dSAlan Stern int port1; 5777d069b7dSAlan Stern 5787d069b7dSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 5797d069b7dSAlan Stern if (hdev->children[port1 - 1]) { 5807d069b7dSAlan Stern usb_disconnect(&hdev->children[port1 - 1]); 5817de18d8bSAlan Stern if (hub->error == 0) 5827d069b7dSAlan Stern hub_port_disable(hub, port1, 0); 5837d069b7dSAlan Stern } 5847d069b7dSAlan Stern } 5857d069b7dSAlan Stern hub_quiesce(hub); 5867d069b7dSAlan Stern } 5877d069b7dSAlan Stern 5887d069b7dSAlan Stern /* caller has locked the hub device */ 5897de18d8bSAlan Stern static void hub_post_reset(struct usb_interface *intf) 5907d069b7dSAlan Stern { 5917de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 5927de18d8bSAlan Stern 5937d069b7dSAlan Stern hub_activate(hub); 5947d069b7dSAlan Stern hub_power_on(hub); 5957d069b7dSAlan Stern } 5967d069b7dSAlan Stern 5977d069b7dSAlan Stern 5981da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 5991da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 6001da177e4SLinus Torvalds { 6011da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 6021da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 6031da177e4SLinus Torvalds u16 hubstatus, hubchange; 60474ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 6051da177e4SLinus Torvalds unsigned int pipe; 6061da177e4SLinus Torvalds int maxp, ret; 6071da177e4SLinus Torvalds char *message; 6081da177e4SLinus Torvalds 6091da177e4SLinus Torvalds hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL, 6101da177e4SLinus Torvalds &hub->buffer_dma); 6111da177e4SLinus Torvalds if (!hub->buffer) { 6121da177e4SLinus Torvalds message = "can't allocate hub irq buffer"; 6131da177e4SLinus Torvalds ret = -ENOMEM; 6141da177e4SLinus Torvalds goto fail; 6151da177e4SLinus Torvalds } 6161da177e4SLinus Torvalds 6171da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 6181da177e4SLinus Torvalds if (!hub->status) { 6191da177e4SLinus Torvalds message = "can't kmalloc hub status buffer"; 6201da177e4SLinus Torvalds ret = -ENOMEM; 6211da177e4SLinus Torvalds goto fail; 6221da177e4SLinus Torvalds } 623db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 6261da177e4SLinus Torvalds if (!hub->descriptor) { 6271da177e4SLinus Torvalds message = "can't kmalloc hub descriptor"; 6281da177e4SLinus Torvalds ret = -ENOMEM; 6291da177e4SLinus Torvalds goto fail; 6301da177e4SLinus Torvalds } 6311da177e4SLinus Torvalds 6321da177e4SLinus Torvalds /* Request the entire hub descriptor. 6331da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 6341da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 6351da177e4SLinus Torvalds */ 6361da177e4SLinus Torvalds ret = get_hub_descriptor(hdev, hub->descriptor, 6371da177e4SLinus Torvalds sizeof(*hub->descriptor)); 6381da177e4SLinus Torvalds if (ret < 0) { 6391da177e4SLinus Torvalds message = "can't read hub descriptor"; 6401da177e4SLinus Torvalds goto fail; 6411da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 6421da177e4SLinus Torvalds message = "hub has too many ports!"; 6431da177e4SLinus Torvalds ret = -ENODEV; 6441da177e4SLinus Torvalds goto fail; 6451da177e4SLinus Torvalds } 6461da177e4SLinus Torvalds 6471da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 6481da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 6491da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 6501da177e4SLinus Torvalds 65174ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 6521da177e4SLinus Torvalds 65374ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_COMPOUND) { 6541da177e4SLinus Torvalds int i; 6551da177e4SLinus Torvalds char portstr [USB_MAXCHILDREN + 1]; 6561da177e4SLinus Torvalds 6571da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 6581da177e4SLinus Torvalds portstr[i] = hub->descriptor->DeviceRemovable 6591da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 6601da177e4SLinus Torvalds ? 'F' : 'R'; 6611da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 6621da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 6631da177e4SLinus Torvalds } else 6641da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 6651da177e4SLinus Torvalds 66674ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 6671da177e4SLinus Torvalds case 0x00: 6681da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 6691da177e4SLinus Torvalds break; 6701da177e4SLinus Torvalds case 0x01: 6711da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 6721da177e4SLinus Torvalds break; 6731da177e4SLinus Torvalds case 0x02: 6741da177e4SLinus Torvalds case 0x03: 6751da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 6761da177e4SLinus Torvalds break; 6771da177e4SLinus Torvalds } 6781da177e4SLinus Torvalds 67974ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 6801da177e4SLinus Torvalds case 0x00: 6811da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 6821da177e4SLinus Torvalds break; 6831da177e4SLinus Torvalds case 0x08: 6841da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 6851da177e4SLinus Torvalds break; 6861da177e4SLinus Torvalds case 0x10: 6871da177e4SLinus Torvalds case 0x18: 6881da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 6891da177e4SLinus Torvalds break; 6901da177e4SLinus Torvalds } 6911da177e4SLinus Torvalds 6921da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 6931da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 694c4028958SDavid Howells INIT_WORK (&hub->tt.kevent, hub_tt_kevent); 6951da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 6961da177e4SLinus Torvalds case 0: 6971da177e4SLinus Torvalds break; 6981da177e4SLinus Torvalds case 1: 6991da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 7001da177e4SLinus Torvalds hub->tt.hub = hdev; 7011da177e4SLinus Torvalds break; 7021da177e4SLinus Torvalds case 2: 7031da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 7041da177e4SLinus Torvalds if (ret == 0) { 7051da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 7061da177e4SLinus Torvalds hub->tt.multi = 1; 7071da177e4SLinus Torvalds } else 7081da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 7091da177e4SLinus Torvalds ret); 7101da177e4SLinus Torvalds hub->tt.hub = hdev; 7111da177e4SLinus Torvalds break; 7121da177e4SLinus Torvalds default: 7131da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 7141da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 7151da177e4SLinus Torvalds break; 7161da177e4SLinus Torvalds } 7171da177e4SLinus Torvalds 718e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 71974ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 720e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 721e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 722e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 723e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 724e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 725e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 726e09711aeSdavid-b@pacbell.net } 7271da177e4SLinus Torvalds break; 728e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 729e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 730e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 731e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 732e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 7331da177e4SLinus Torvalds break; 734e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 735e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 736e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 737e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 738e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 7391da177e4SLinus Torvalds break; 740e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 741e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 742e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 743e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 744e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 7451da177e4SLinus Torvalds break; 7461da177e4SLinus Torvalds } 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 74974ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 7501da177e4SLinus Torvalds hub->has_indicators = 1; 7511da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 7521da177e4SLinus Torvalds } 7531da177e4SLinus Torvalds 7541da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 7551da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 7561da177e4SLinus Torvalds 7571da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 7581da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 7591da177e4SLinus Torvalds */ 7601da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 76155c52718SAlan Stern if (ret < 2) { 7621da177e4SLinus Torvalds message = "can't get hub status"; 7631da177e4SLinus Torvalds goto fail; 7641da177e4SLinus Torvalds } 7657d35b929SAlan Stern le16_to_cpus(&hubstatus); 7667d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 76755c52718SAlan Stern if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) 76855c52718SAlan Stern hub->mA_per_port = 500; 76955c52718SAlan Stern else { 77055c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 77155c52718SAlan Stern hub->limited_power = 1; 77255c52718SAlan Stern } 7737d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 7741da177e4SLinus Torvalds dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 7751da177e4SLinus Torvalds hub->descriptor->bHubContrCurrent); 77655c52718SAlan Stern hub->limited_power = 1; 77755c52718SAlan Stern if (hdev->maxchild > 0) { 77855c52718SAlan Stern int remaining = hdev->bus_mA - 77955c52718SAlan Stern hub->descriptor->bHubContrCurrent; 7801da177e4SLinus Torvalds 78155c52718SAlan Stern if (remaining < hdev->maxchild * 100) 78255c52718SAlan Stern dev_warn(hub_dev, 78355c52718SAlan Stern "insufficient power available " 78455c52718SAlan Stern "to use all downstream ports\n"); 78555c52718SAlan Stern hub->mA_per_port = 100; /* 7.2.1.1 */ 78655c52718SAlan Stern } 78755c52718SAlan Stern } else { /* Self-powered external hub */ 78855c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 78955c52718SAlan Stern * provide less current per port? */ 79055c52718SAlan Stern hub->mA_per_port = 500; 79155c52718SAlan Stern } 79255c52718SAlan Stern if (hub->mA_per_port < 500) 79355c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 79455c52718SAlan Stern hub->mA_per_port); 7951da177e4SLinus Torvalds 7961da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 7971da177e4SLinus Torvalds if (ret < 0) { 7981da177e4SLinus Torvalds message = "can't get hub status"; 7991da177e4SLinus Torvalds goto fail; 8001da177e4SLinus Torvalds } 8011da177e4SLinus Torvalds 8021da177e4SLinus Torvalds /* local power status reports aren't always correct */ 8031da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 8041da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 8051da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 8061da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 8071da177e4SLinus Torvalds 80874ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 8091da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 8101da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 8111da177e4SLinus Torvalds 81288fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 81388fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 81488fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 81588fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 81688fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 81788fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 8181da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 8191da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 8201da177e4SLinus Torvalds 8211da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 8221da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 8231da177e4SLinus Torvalds 8241da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 8251da177e4SLinus Torvalds if (!hub->urb) { 8261da177e4SLinus Torvalds message = "couldn't allocate interrupt urb"; 8271da177e4SLinus Torvalds ret = -ENOMEM; 8281da177e4SLinus Torvalds goto fail; 8291da177e4SLinus Torvalds } 8301da177e4SLinus Torvalds 8311da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 8321da177e4SLinus Torvalds hub, endpoint->bInterval); 8331da177e4SLinus Torvalds hub->urb->transfer_dma = hub->buffer_dma; 8341da177e4SLinus Torvalds hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 8351da177e4SLinus Torvalds 8361da177e4SLinus Torvalds /* maybe cycle the hub leds */ 8371da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 8381da177e4SLinus Torvalds hub->indicator [0] = INDICATOR_CYCLE; 8391da177e4SLinus Torvalds 8401da177e4SLinus Torvalds hub_power_on(hub); 8411da177e4SLinus Torvalds hub_activate(hub); 8421da177e4SLinus Torvalds return 0; 8431da177e4SLinus Torvalds 8441da177e4SLinus Torvalds fail: 8451da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 8461da177e4SLinus Torvalds message, ret); 8471da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 8481da177e4SLinus Torvalds return ret; 8491da177e4SLinus Torvalds } 8501da177e4SLinus Torvalds 8511da177e4SLinus Torvalds static unsigned highspeed_hubs; 8521da177e4SLinus Torvalds 8531da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 8541da177e4SLinus Torvalds { 8551da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 8561da177e4SLinus Torvalds struct usb_device *hdev; 8571da177e4SLinus Torvalds 8587de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 8597de18d8bSAlan Stern hub->error = 0; 8607de18d8bSAlan Stern hub_pre_reset(intf); 8617de18d8bSAlan Stern 8628b28c752SAlan Stern usb_set_intfdata (intf, NULL); 8631da177e4SLinus Torvalds hdev = hub->hdev; 8641da177e4SLinus Torvalds 8651da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 8661da177e4SLinus Torvalds highspeed_hubs--; 8671da177e4SLinus Torvalds 8681da177e4SLinus Torvalds usb_free_urb(hub->urb); 8691da177e4SLinus Torvalds hub->urb = NULL; 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 8721da177e4SLinus Torvalds list_del_init(&hub->event_list); 8731da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 8741da177e4SLinus Torvalds 8751da177e4SLinus Torvalds kfree(hub->descriptor); 8761da177e4SLinus Torvalds hub->descriptor = NULL; 8771da177e4SLinus Torvalds 8781da177e4SLinus Torvalds kfree(hub->status); 8791da177e4SLinus Torvalds hub->status = NULL; 8801da177e4SLinus Torvalds 8811da177e4SLinus Torvalds if (hub->buffer) { 8821da177e4SLinus Torvalds usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer, 8831da177e4SLinus Torvalds hub->buffer_dma); 8841da177e4SLinus Torvalds hub->buffer = NULL; 8851da177e4SLinus Torvalds } 8861da177e4SLinus Torvalds 8871da177e4SLinus Torvalds kfree(hub); 8881da177e4SLinus Torvalds } 8891da177e4SLinus Torvalds 8901da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 8911da177e4SLinus Torvalds { 8921da177e4SLinus Torvalds struct usb_host_interface *desc; 8931da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 8941da177e4SLinus Torvalds struct usb_device *hdev; 8951da177e4SLinus Torvalds struct usb_hub *hub; 8961da177e4SLinus Torvalds 8971da177e4SLinus Torvalds desc = intf->cur_altsetting; 8981da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 8991da177e4SLinus Torvalds 90089ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 90189ccbdc9SDavid Brownell if (hdev->parent) { 90289ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 90389ccbdc9SDavid Brownell return -ENODEV; 90489ccbdc9SDavid Brownell } 90589ccbdc9SDavid Brownell #endif 90689ccbdc9SDavid Brownell 9071da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 9081da177e4SLinus Torvalds /* specs is not defined, but it works */ 9091da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 9101da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 9111da177e4SLinus Torvalds descriptor_error: 9121da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 9131da177e4SLinus Torvalds return -EIO; 9141da177e4SLinus Torvalds } 9151da177e4SLinus Torvalds 9161da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 9171da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 9181da177e4SLinus Torvalds goto descriptor_error; 9191da177e4SLinus Torvalds 9201da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 9211da177e4SLinus Torvalds 922fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 923fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 9241da177e4SLinus Torvalds goto descriptor_error; 9251da177e4SLinus Torvalds 9261da177e4SLinus Torvalds /* We found a hub */ 9271da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 9281da177e4SLinus Torvalds 9290a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 9301da177e4SLinus Torvalds if (!hub) { 9311da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 9321da177e4SLinus Torvalds return -ENOMEM; 9331da177e4SLinus Torvalds } 9341da177e4SLinus Torvalds 9351da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 9361da177e4SLinus Torvalds hub->intfdev = &intf->dev; 9371da177e4SLinus Torvalds hub->hdev = hdev; 938c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 9391da177e4SLinus Torvalds 9401da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 94140f122f3SAlan Stern intf->needs_remote_wakeup = 1; 9421da177e4SLinus Torvalds 9431da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 9441da177e4SLinus Torvalds highspeed_hubs++; 9451da177e4SLinus Torvalds 9461da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 9471da177e4SLinus Torvalds return 0; 9481da177e4SLinus Torvalds 9491da177e4SLinus Torvalds hub_disconnect (intf); 9501da177e4SLinus Torvalds return -ENODEV; 9511da177e4SLinus Torvalds } 9521da177e4SLinus Torvalds 9531da177e4SLinus Torvalds static int 9541da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 9551da177e4SLinus Torvalds { 9561da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 9571da177e4SLinus Torvalds 9581da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 9591da177e4SLinus Torvalds switch (code) { 9601da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 9611da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 9621da177e4SLinus Torvalds int i; 9631da177e4SLinus Torvalds 9641da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 9651da177e4SLinus Torvalds if (hdev->devnum <= 0) 9661da177e4SLinus Torvalds info->nports = 0; 9671da177e4SLinus Torvalds else { 9681da177e4SLinus Torvalds info->nports = hdev->maxchild; 9691da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 9701da177e4SLinus Torvalds if (hdev->children[i] == NULL) 9711da177e4SLinus Torvalds info->port[i] = 0; 9721da177e4SLinus Torvalds else 9731da177e4SLinus Torvalds info->port[i] = 9741da177e4SLinus Torvalds hdev->children[i]->devnum; 9751da177e4SLinus Torvalds } 9761da177e4SLinus Torvalds } 9771da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds return info->nports + 1; 9801da177e4SLinus Torvalds } 9811da177e4SLinus Torvalds 9821da177e4SLinus Torvalds default: 9831da177e4SLinus Torvalds return -ENOSYS; 9841da177e4SLinus Torvalds } 9851da177e4SLinus Torvalds } 9861da177e4SLinus Torvalds 9871da177e4SLinus Torvalds 9881da177e4SLinus Torvalds /* grab device/port lock, returning index of that port (zero based). 9891da177e4SLinus Torvalds * protects the upstream link used by this device from concurrent 9901da177e4SLinus Torvalds * tree operations like suspend, resume, reset, and disconnect, which 9911da177e4SLinus Torvalds * apply to everything downstream of a given port. 9921da177e4SLinus Torvalds */ 9931da177e4SLinus Torvalds static int locktree(struct usb_device *udev) 9941da177e4SLinus Torvalds { 9951da177e4SLinus Torvalds int t; 9961da177e4SLinus Torvalds struct usb_device *hdev; 9971da177e4SLinus Torvalds 9981da177e4SLinus Torvalds if (!udev) 9991da177e4SLinus Torvalds return -ENODEV; 10001da177e4SLinus Torvalds 10011da177e4SLinus Torvalds /* root hub is always the first lock in the series */ 10021da177e4SLinus Torvalds hdev = udev->parent; 10031da177e4SLinus Torvalds if (!hdev) { 10041da177e4SLinus Torvalds usb_lock_device(udev); 10051da177e4SLinus Torvalds return 0; 10061da177e4SLinus Torvalds } 10071da177e4SLinus Torvalds 10081da177e4SLinus Torvalds /* on the path from root to us, lock everything from 10091da177e4SLinus Torvalds * top down, dropping parent locks when not needed 10101da177e4SLinus Torvalds */ 10111da177e4SLinus Torvalds t = locktree(hdev); 10121da177e4SLinus Torvalds if (t < 0) 10131da177e4SLinus Torvalds return t; 101412c3da34SAlan Stern 10151da177e4SLinus Torvalds /* everything is fail-fast once disconnect 10161da177e4SLinus Torvalds * processing starts 10171da177e4SLinus Torvalds */ 101812c3da34SAlan Stern if (udev->state == USB_STATE_NOTATTACHED) { 101912c3da34SAlan Stern usb_unlock_device(hdev); 102012c3da34SAlan Stern return -ENODEV; 102112c3da34SAlan Stern } 10221da177e4SLinus Torvalds 10231da177e4SLinus Torvalds /* when everyone grabs locks top->bottom, 10241da177e4SLinus Torvalds * non-overlapping work may be concurrent 10251da177e4SLinus Torvalds */ 10269ad3d6ccSAlan Stern usb_lock_device(udev); 10279ad3d6ccSAlan Stern usb_unlock_device(hdev); 102812c3da34SAlan Stern return udev->portnum; 10291da177e4SLinus Torvalds } 10301da177e4SLinus Torvalds 10311da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 10321da177e4SLinus Torvalds { 10331da177e4SLinus Torvalds int i; 10341da177e4SLinus Torvalds 10351da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 10361da177e4SLinus Torvalds if (udev->children[i]) 10371da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev->children[i]); 10381da177e4SLinus Torvalds } 1039ee49fb5dSAlan Stern if (udev->state == USB_STATE_SUSPENDED) 1040ee49fb5dSAlan Stern udev->discon_suspended = 1; 10411da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 10421da177e4SLinus Torvalds } 10431da177e4SLinus Torvalds 10441da177e4SLinus Torvalds /** 10451da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 10461da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 10471da177e4SLinus Torvalds * @new_state: new state value to be stored 10481da177e4SLinus Torvalds * 10491da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 10501da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 10511da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 10521da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 10531da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 10541da177e4SLinus Torvalds * all changes to any device's state must be protected by the 10551da177e4SLinus Torvalds * device_state_lock spinlock. 10561da177e4SLinus Torvalds * 10571da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 10581da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 10591da177e4SLinus Torvalds * 10601da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 10611da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 10621da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 10631da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 10641da177e4SLinus Torvalds */ 10651da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 10661da177e4SLinus Torvalds enum usb_device_state new_state) 10671da177e4SLinus Torvalds { 10681da177e4SLinus Torvalds unsigned long flags; 10691da177e4SLinus Torvalds 10701da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 10711da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 10721da177e4SLinus Torvalds ; /* do nothing */ 1073b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1074fb669cc0SDavid Brownell 1075fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1076fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1077fb669cc0SDavid Brownell */ 1078fb669cc0SDavid Brownell if (udev->parent) { 1079645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1080645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1081645daaabSAlan Stern ; /* No change to wakeup settings */ 1082645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 1083b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 1084b94dc6b5SDavid Brownell (udev->actconfig->desc.bmAttributes 1085b94dc6b5SDavid Brownell & USB_CONFIG_ATT_WAKEUP)); 1086645daaabSAlan Stern else 1087b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 0); 1088fb669cc0SDavid Brownell } 1089645daaabSAlan Stern udev->state = new_state; 1090b94dc6b5SDavid Brownell } else 10911da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 10921da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 10931da177e4SLinus Torvalds } 10941da177e4SLinus Torvalds 10951da177e4SLinus Torvalds 10961c50c317SAlan Stern #ifdef CONFIG_PM 10971c50c317SAlan Stern 10981c50c317SAlan Stern /** 10991c50c317SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 11001c50c317SAlan Stern * @rhdev: struct usb_device for the root hub 11011c50c317SAlan Stern * 11021c50c317SAlan Stern * The USB host controller driver calls this function when its root hub 11031c50c317SAlan Stern * is resumed and Vbus power has been interrupted or the controller 11041c50c317SAlan Stern * has been reset. The routine marks all the children of the root hub 11051c50c317SAlan Stern * as NOTATTACHED and marks logical connect-change events on their ports. 11061c50c317SAlan Stern */ 11071c50c317SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 11081c50c317SAlan Stern { 11091c50c317SAlan Stern struct usb_hub *hub; 11101c50c317SAlan Stern int port1; 11111c50c317SAlan Stern unsigned long flags; 11121c50c317SAlan Stern 11131c50c317SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 1114353a4098SAlan Stern 1115353a4098SAlan Stern /* Make sure no potential wakeup events get lost, 1116353a4098SAlan Stern * by forcing the root hub to be resumed. 1117353a4098SAlan Stern */ 1118353a4098SAlan Stern rhdev->dev.power.prev_state.event = PM_EVENT_ON; 1119353a4098SAlan Stern 11201c50c317SAlan Stern spin_lock_irqsave(&device_state_lock, flags); 11211c50c317SAlan Stern hub = hdev_to_hub(rhdev); 11221c50c317SAlan Stern for (port1 = 1; port1 <= rhdev->maxchild; ++port1) { 11231c50c317SAlan Stern if (rhdev->children[port1 - 1]) { 11241c50c317SAlan Stern recursively_mark_NOTATTACHED( 11251c50c317SAlan Stern rhdev->children[port1 - 1]); 11261c50c317SAlan Stern set_bit(port1, hub->change_bits); 11271c50c317SAlan Stern } 11281c50c317SAlan Stern } 11291c50c317SAlan Stern spin_unlock_irqrestore(&device_state_lock, flags); 11301c50c317SAlan Stern } 11311c50c317SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 11321c50c317SAlan Stern 1133d388dab7SAlan Stern #endif /* CONFIG_PM */ 11341c50c317SAlan Stern 11351da177e4SLinus Torvalds static void choose_address(struct usb_device *udev) 11361da177e4SLinus Torvalds { 11371da177e4SLinus Torvalds int devnum; 11381da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 11391da177e4SLinus Torvalds 11401da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 11411da177e4SLinus Torvalds 11421da177e4SLinus Torvalds /* Try to allocate the next devnum beginning at bus->devnum_next. */ 11431da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 11441da177e4SLinus Torvalds bus->devnum_next); 11451da177e4SLinus Torvalds if (devnum >= 128) 11461da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1); 11471da177e4SLinus Torvalds 11481da177e4SLinus Torvalds bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); 11491da177e4SLinus Torvalds 11501da177e4SLinus Torvalds if (devnum < 128) { 11511da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 11521da177e4SLinus Torvalds udev->devnum = devnum; 11531da177e4SLinus Torvalds } 11541da177e4SLinus Torvalds } 11551da177e4SLinus Torvalds 11561da177e4SLinus Torvalds static void release_address(struct usb_device *udev) 11571da177e4SLinus Torvalds { 11581da177e4SLinus Torvalds if (udev->devnum > 0) { 11591da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 11601da177e4SLinus Torvalds udev->devnum = -1; 11611da177e4SLinus Torvalds } 11621da177e4SLinus Torvalds } 11631da177e4SLinus Torvalds 11641da177e4SLinus Torvalds /** 11651da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 11661da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 11671da177e4SLinus Torvalds * Context: !in_interrupt () 11681da177e4SLinus Torvalds * 11691da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 11701da177e4SLinus Torvalds * 11711da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 11721da177e4SLinus Torvalds * If *pdev is a root hub then this routine will acquire the 11731da177e4SLinus Torvalds * usb_bus_list_lock on behalf of the caller. 11741da177e4SLinus Torvalds * 11751da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 11761da177e4SLinus Torvalds * controllers) should ever call this. 11771da177e4SLinus Torvalds * 11781da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 11791da177e4SLinus Torvalds */ 11801da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 11811da177e4SLinus Torvalds { 11821da177e4SLinus Torvalds struct usb_device *udev = *pdev; 11831da177e4SLinus Torvalds int i; 11841da177e4SLinus Torvalds 11851da177e4SLinus Torvalds if (!udev) { 11861da177e4SLinus Torvalds pr_debug ("%s nodev\n", __FUNCTION__); 11871da177e4SLinus Torvalds return; 11881da177e4SLinus Torvalds } 11891da177e4SLinus Torvalds 11901da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 11911da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 11921da177e4SLinus Torvalds * this quiesces everyting except pending urbs. 11931da177e4SLinus Torvalds */ 11941da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 11951da177e4SLinus Torvalds dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); 11961da177e4SLinus Torvalds 11979ad3d6ccSAlan Stern usb_lock_device(udev); 11989ad3d6ccSAlan Stern 11991da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 12001da177e4SLinus Torvalds for (i = 0; i < USB_MAXCHILDREN; i++) { 12011da177e4SLinus Torvalds if (udev->children[i]) 12021da177e4SLinus Torvalds usb_disconnect(&udev->children[i]); 12031da177e4SLinus Torvalds } 12041da177e4SLinus Torvalds 12051da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 12061da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 12071da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 12081da177e4SLinus Torvalds */ 1209782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 12101da177e4SLinus Torvalds usb_disable_device(udev, 0); 12111da177e4SLinus Torvalds 1212782da727SAlan Stern usb_unlock_device(udev); 12133099e75aSGreg Kroah-Hartman 1214782da727SAlan Stern /* Unregister the device. The device driver is responsible 1215782da727SAlan Stern * for removing the device files from usbfs and sysfs and for 1216782da727SAlan Stern * de-configuring the device. 1217782da727SAlan Stern */ 1218782da727SAlan Stern device_del(&udev->dev); 1219782da727SAlan Stern 1220782da727SAlan Stern /* Free the device number and delete the parent's children[] 12211da177e4SLinus Torvalds * (or root_hub) pointer. 12221da177e4SLinus Torvalds */ 12231da177e4SLinus Torvalds release_address(udev); 12241da177e4SLinus Torvalds 12251da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 12261da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 12271da177e4SLinus Torvalds *pdev = NULL; 12281da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 12291da177e4SLinus Torvalds 1230ee49fb5dSAlan Stern /* Decrement the parent's count of unsuspended children */ 1231ee49fb5dSAlan Stern if (udev->parent) { 1232ee49fb5dSAlan Stern usb_pm_lock(udev); 1233ee49fb5dSAlan Stern if (!udev->discon_suspended) 123494fcda1fSAlan Stern usb_autosuspend_device(udev->parent); 1235ee49fb5dSAlan Stern usb_pm_unlock(udev); 1236ee49fb5dSAlan Stern } 1237ee49fb5dSAlan Stern 1238782da727SAlan Stern put_device(&udev->dev); 12391da177e4SLinus Torvalds } 12401da177e4SLinus Torvalds 12411da177e4SLinus Torvalds #ifdef DEBUG 12421da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 12431da177e4SLinus Torvalds { 12441da177e4SLinus Torvalds if (!string) 12451da177e4SLinus Torvalds return; 12461da177e4SLinus Torvalds dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); 12471da177e4SLinus Torvalds } 12481da177e4SLinus Torvalds 12491da177e4SLinus Torvalds #else 12501da177e4SLinus Torvalds static inline void show_string(struct usb_device *udev, char *id, char *string) 12511da177e4SLinus Torvalds {} 12521da177e4SLinus Torvalds #endif 12531da177e4SLinus Torvalds 12541da177e4SLinus Torvalds 12551da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 12561da177e4SLinus Torvalds #include "otg_whitelist.h" 125711bd44abSDavid Brownell static int __usb_port_suspend(struct usb_device *, int port1); 12581da177e4SLinus Torvalds #endif 12591da177e4SLinus Torvalds 12603ede760fSOliver Neukum /** 12613ede760fSOliver Neukum * usb_new_device - perform initial device setup (usbcore-internal) 12623ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 12633ede760fSOliver Neukum * 12643ede760fSOliver Neukum * This is called with devices which have been enumerated, but not yet 12653ede760fSOliver Neukum * configured. The device descriptor is available, but not descriptors 12663ede760fSOliver Neukum * for any device configuration. The caller must have locked either 12673ede760fSOliver Neukum * the parent hub (if udev is a normal device) or else the 12683ede760fSOliver Neukum * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 12693ede760fSOliver Neukum * udev has already been installed, but udev is not yet visible through 12703ede760fSOliver Neukum * sysfs or other filesystem code. 12713ede760fSOliver Neukum * 12723ede760fSOliver Neukum * It will return if the device is configured properly or not. Zero if 12733ede760fSOliver Neukum * the interface was registered with the driver core; else a negative 12743ede760fSOliver Neukum * errno value. 12753ede760fSOliver Neukum * 12763ede760fSOliver Neukum * This call is synchronous, and may not be used in an interrupt context. 12773ede760fSOliver Neukum * 12783ede760fSOliver Neukum * Only the hub driver or root-hub registrar should ever call this. 12793ede760fSOliver Neukum */ 12803ede760fSOliver Neukum int usb_new_device(struct usb_device *udev) 12811da177e4SLinus Torvalds { 12821da177e4SLinus Torvalds int err; 12831da177e4SLinus Torvalds 1284c066475eSGreg Kroah-Hartman /* Lock ourself into memory in order to keep a probe sequence 1285c066475eSGreg Kroah-Hartman * sleeping in a new thread from allowing us to be unloaded. 1286c066475eSGreg Kroah-Hartman */ 1287c066475eSGreg Kroah-Hartman if (!try_module_get(THIS_MODULE)) 1288c066475eSGreg Kroah-Hartman return -EINVAL; 1289c066475eSGreg Kroah-Hartman 12907ceec1f1SOliver Neukum /* Determine quirks */ 12917ceec1f1SOliver Neukum usb_detect_quirks(udev); 12927ceec1f1SOliver Neukum 12931da177e4SLinus Torvalds err = usb_get_configuration(udev); 12941da177e4SLinus Torvalds if (err < 0) { 12951da177e4SLinus Torvalds dev_err(&udev->dev, "can't read configurations, error %d\n", 12961da177e4SLinus Torvalds err); 12971da177e4SLinus Torvalds goto fail; 12981da177e4SLinus Torvalds } 12991da177e4SLinus Torvalds 13001da177e4SLinus Torvalds /* read the standard strings and cache them if present */ 13014f62efe6SAlan Stern udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 13024f62efe6SAlan Stern udev->manufacturer = usb_cache_string(udev, 13034f62efe6SAlan Stern udev->descriptor.iManufacturer); 13044f62efe6SAlan Stern udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 13051da177e4SLinus Torvalds 13061da177e4SLinus Torvalds /* Tell the world! */ 13071da177e4SLinus Torvalds dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, " 13081da177e4SLinus Torvalds "SerialNumber=%d\n", 13091da177e4SLinus Torvalds udev->descriptor.iManufacturer, 13101da177e4SLinus Torvalds udev->descriptor.iProduct, 13111da177e4SLinus Torvalds udev->descriptor.iSerialNumber); 13121da177e4SLinus Torvalds show_string(udev, "Product", udev->product); 13131da177e4SLinus Torvalds show_string(udev, "Manufacturer", udev->manufacturer); 13141da177e4SLinus Torvalds show_string(udev, "SerialNumber", udev->serial); 13151da177e4SLinus Torvalds 13161da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 13171da177e4SLinus Torvalds /* 13181da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 13191da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 13201da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 13211da177e4SLinus Torvalds */ 13221da177e4SLinus Torvalds if (!udev->bus->is_b_host 13231da177e4SLinus Torvalds && udev->config 13241da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 13251da177e4SLinus Torvalds struct usb_otg_descriptor *desc = 0; 13261da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 13271da177e4SLinus Torvalds 13281da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 13291da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 13301da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 13311da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 13321da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 133312c3da34SAlan Stern unsigned port1 = udev->portnum; 13341da177e4SLinus Torvalds 13351da177e4SLinus Torvalds dev_info(&udev->dev, 13361da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 13371da177e4SLinus Torvalds (port1 == bus->otg_port) 13381da177e4SLinus Torvalds ? "" : "non-"); 13391da177e4SLinus Torvalds 13401da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 13411da177e4SLinus Torvalds if (port1 == bus->otg_port) 13421da177e4SLinus Torvalds bus->b_hnp_enable = 1; 13431da177e4SLinus Torvalds err = usb_control_msg(udev, 13441da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 13451da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 13461da177e4SLinus Torvalds bus->b_hnp_enable 13471da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 13481da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 13491da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 13501da177e4SLinus Torvalds if (err < 0) { 13511da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 13521da177e4SLinus Torvalds * customize to match your product. 13531da177e4SLinus Torvalds */ 13541da177e4SLinus Torvalds dev_info(&udev->dev, 13551da177e4SLinus Torvalds "can't set HNP mode; %d\n", 13561da177e4SLinus Torvalds err); 13571da177e4SLinus Torvalds bus->b_hnp_enable = 0; 13581da177e4SLinus Torvalds } 13591da177e4SLinus Torvalds } 13601da177e4SLinus Torvalds } 13611da177e4SLinus Torvalds } 13621da177e4SLinus Torvalds 13631da177e4SLinus Torvalds if (!is_targeted(udev)) { 13641da177e4SLinus Torvalds 13651da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 13661da177e4SLinus Torvalds * (Includes HNP test device.) 13671da177e4SLinus Torvalds */ 13681da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 1369140d8f68SAlan Stern err = __usb_port_suspend(udev, udev->bus->otg_port); 13701da177e4SLinus Torvalds if (err < 0) 13711da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 13721da177e4SLinus Torvalds } 13731da177e4SLinus Torvalds err = -ENODEV; 13741da177e4SLinus Torvalds goto fail; 13751da177e4SLinus Torvalds } 13761da177e4SLinus Torvalds #endif 13771da177e4SLinus Torvalds 1378782da727SAlan Stern /* Register the device. The device driver is responsible 1379782da727SAlan Stern * for adding the device files to usbfs and sysfs and for 1380782da727SAlan Stern * configuring the device. 1381782da727SAlan Stern */ 13821da177e4SLinus Torvalds err = device_add (&udev->dev); 13831da177e4SLinus Torvalds if (err) { 13841da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 13851da177e4SLinus Torvalds goto fail; 13861da177e4SLinus Torvalds } 13879ad3d6ccSAlan Stern 1388ee49fb5dSAlan Stern /* Increment the parent's count of unsuspended children */ 1389ee49fb5dSAlan Stern if (udev->parent) 139094fcda1fSAlan Stern usb_autoresume_device(udev->parent); 1391ee49fb5dSAlan Stern 1392c066475eSGreg Kroah-Hartman exit: 1393c066475eSGreg Kroah-Hartman module_put(THIS_MODULE); 1394c066475eSGreg Kroah-Hartman return err; 13951da177e4SLinus Torvalds 13961da177e4SLinus Torvalds fail: 13971da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 1398c066475eSGreg Kroah-Hartman goto exit; 13991da177e4SLinus Torvalds } 14001da177e4SLinus Torvalds 14011da177e4SLinus Torvalds static int hub_port_status(struct usb_hub *hub, int port1, 14021da177e4SLinus Torvalds u16 *status, u16 *change) 14031da177e4SLinus Torvalds { 14041da177e4SLinus Torvalds int ret; 14051da177e4SLinus Torvalds 1406db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 14071da177e4SLinus Torvalds ret = get_port_status(hub->hdev, port1, &hub->status->port); 1408d25450c6SAlan Stern if (ret < 4) { 14091da177e4SLinus Torvalds dev_err (hub->intfdev, 14101da177e4SLinus Torvalds "%s failed (err = %d)\n", __FUNCTION__, ret); 1411d25450c6SAlan Stern if (ret >= 0) 1412d25450c6SAlan Stern ret = -EIO; 1413d25450c6SAlan Stern } else { 14141da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->port.wPortStatus); 14151da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->port.wPortChange); 14161da177e4SLinus Torvalds ret = 0; 14171da177e4SLinus Torvalds } 1418db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 14191da177e4SLinus Torvalds return ret; 14201da177e4SLinus Torvalds } 14211da177e4SLinus Torvalds 14220165de09SInaky Perez-Gonzalez 14230165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 14240165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 14250165de09SInaky Perez-Gonzalez { 14260165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 14270165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 14280165de09SInaky Perez-Gonzalez return 0; 14290165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 14300165de09SInaky Perez-Gonzalez return hcd->wireless; 14310165de09SInaky Perez-Gonzalez } 14320165de09SInaky Perez-Gonzalez 14330165de09SInaky Perez-Gonzalez 14341da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 14351da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 14361da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 14371da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 14381da177e4SLinus Torvalds #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) 14391da177e4SLinus Torvalds 14401da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 14411da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 14421da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 14431da177e4SLinus Torvalds #define HUB_RESET_TIMEOUT 500 14441da177e4SLinus Torvalds 14451da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 14461da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 14471da177e4SLinus Torvalds { 14481da177e4SLinus Torvalds int delay_time, ret; 14491da177e4SLinus Torvalds u16 portstatus; 14501da177e4SLinus Torvalds u16 portchange; 14511da177e4SLinus Torvalds 14521da177e4SLinus Torvalds for (delay_time = 0; 14531da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 14541da177e4SLinus Torvalds delay_time += delay) { 14551da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 14561da177e4SLinus Torvalds msleep(delay); 14571da177e4SLinus Torvalds 14581da177e4SLinus Torvalds /* read and decode port status */ 14591da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 14601da177e4SLinus Torvalds if (ret < 0) 14611da177e4SLinus Torvalds return ret; 14621da177e4SLinus Torvalds 14631da177e4SLinus Torvalds /* Device went away? */ 14641da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 14651da177e4SLinus Torvalds return -ENOTCONN; 14661da177e4SLinus Torvalds 14671da177e4SLinus Torvalds /* bomb out completely if something weird happened */ 14681da177e4SLinus Torvalds if ((portchange & USB_PORT_STAT_C_CONNECTION)) 14691da177e4SLinus Torvalds return -EINVAL; 14701da177e4SLinus Torvalds 14711da177e4SLinus Torvalds /* if we`ve finished resetting, then break out of the loop */ 14721da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_RESET) && 14731da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_ENABLE)) { 14740165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 14750165de09SInaky Perez-Gonzalez udev->speed = USB_SPEED_VARIABLE; 14760165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 14771da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 14781da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 14791da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 14801da177e4SLinus Torvalds else 14811da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 14821da177e4SLinus Torvalds return 0; 14831da177e4SLinus Torvalds } 14841da177e4SLinus Torvalds 14851da177e4SLinus Torvalds /* switch to the long delay after two short delay failures */ 14861da177e4SLinus Torvalds if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 14871da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 14881da177e4SLinus Torvalds 14891da177e4SLinus Torvalds dev_dbg (hub->intfdev, 14901da177e4SLinus Torvalds "port %d not reset yet, waiting %dms\n", 14911da177e4SLinus Torvalds port1, delay); 14921da177e4SLinus Torvalds } 14931da177e4SLinus Torvalds 14941da177e4SLinus Torvalds return -EBUSY; 14951da177e4SLinus Torvalds } 14961da177e4SLinus Torvalds 14971da177e4SLinus Torvalds static int hub_port_reset(struct usb_hub *hub, int port1, 14981da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 14991da177e4SLinus Torvalds { 15001da177e4SLinus Torvalds int i, status; 15011da177e4SLinus Torvalds 15021da177e4SLinus Torvalds /* Reset the port */ 15031da177e4SLinus Torvalds for (i = 0; i < PORT_RESET_TRIES; i++) { 15041da177e4SLinus Torvalds status = set_port_feature(hub->hdev, 15051da177e4SLinus Torvalds port1, USB_PORT_FEAT_RESET); 15061da177e4SLinus Torvalds if (status) 15071da177e4SLinus Torvalds dev_err(hub->intfdev, 15081da177e4SLinus Torvalds "cannot reset port %d (err = %d)\n", 15091da177e4SLinus Torvalds port1, status); 15101da177e4SLinus Torvalds else { 15111da177e4SLinus Torvalds status = hub_port_wait_reset(hub, port1, udev, delay); 1512dd16525bSDavid Brownell if (status && status != -ENOTCONN) 15131da177e4SLinus Torvalds dev_dbg(hub->intfdev, 15141da177e4SLinus Torvalds "port_wait_reset: err = %d\n", 15151da177e4SLinus Torvalds status); 15161da177e4SLinus Torvalds } 15171da177e4SLinus Torvalds 15181da177e4SLinus Torvalds /* return on disconnect or reset */ 15191da177e4SLinus Torvalds switch (status) { 15201da177e4SLinus Torvalds case 0: 1521b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 1522b789696aSDavid Brownell msleep(10 + 40); 15231da177e4SLinus Torvalds /* FALL THROUGH */ 15241da177e4SLinus Torvalds case -ENOTCONN: 15251da177e4SLinus Torvalds case -ENODEV: 15261da177e4SLinus Torvalds clear_port_feature(hub->hdev, 15271da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 15281da177e4SLinus Torvalds /* FIXME need disconnect() for NOTATTACHED device */ 15291da177e4SLinus Torvalds usb_set_device_state(udev, status 15301da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 15311da177e4SLinus Torvalds : USB_STATE_DEFAULT); 15321da177e4SLinus Torvalds return status; 15331da177e4SLinus Torvalds } 15341da177e4SLinus Torvalds 15351da177e4SLinus Torvalds dev_dbg (hub->intfdev, 15361da177e4SLinus Torvalds "port %d not enabled, trying reset again...\n", 15371da177e4SLinus Torvalds port1); 15381da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 15391da177e4SLinus Torvalds } 15401da177e4SLinus Torvalds 15411da177e4SLinus Torvalds dev_err (hub->intfdev, 15421da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 15431da177e4SLinus Torvalds port1); 15441da177e4SLinus Torvalds 15451da177e4SLinus Torvalds return status; 15461da177e4SLinus Torvalds } 15471da177e4SLinus Torvalds 15481da177e4SLinus Torvalds /* 15491da177e4SLinus Torvalds * Disable a port and mark a logical connnect-change event, so that some 15501da177e4SLinus Torvalds * time later khubd will disconnect() any existing usb_device on the port 15511da177e4SLinus Torvalds * and will re-enumerate if there actually is a device attached. 15521da177e4SLinus Torvalds */ 15531da177e4SLinus Torvalds static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 15541da177e4SLinus Torvalds { 15551da177e4SLinus Torvalds dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 15561da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 15571da177e4SLinus Torvalds 15581da177e4SLinus Torvalds /* FIXME let caller ask to power down the port: 15591da177e4SLinus Torvalds * - some devices won't enumerate without a VBUS power cycle 15601da177e4SLinus Torvalds * - SRP saves power that way 1561390a8c34SDavid Brownell * - ... new call, TBD ... 15621da177e4SLinus Torvalds * That's easy if this hub can switch power per-port, and 15631da177e4SLinus Torvalds * khubd reactivates the port later (timer, SRP, etc). 15641da177e4SLinus Torvalds * Powerdown must be optional, because of reset/DFU. 15651da177e4SLinus Torvalds */ 15661da177e4SLinus Torvalds 15671da177e4SLinus Torvalds set_bit(port1, hub->change_bits); 15681da177e4SLinus Torvalds kick_khubd(hub); 15691da177e4SLinus Torvalds } 15701da177e4SLinus Torvalds 1571d388dab7SAlan Stern #ifdef CONFIG_PM 15721da177e4SLinus Torvalds 15731da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 15741da177e4SLinus Torvalds 15751da177e4SLinus Torvalds /* 15761da177e4SLinus Torvalds * Selective port suspend reduces power; most suspended devices draw 15771da177e4SLinus Torvalds * less than 500 uA. It's also used in OTG, along with remote wakeup. 15781da177e4SLinus Torvalds * All devices below the suspended port are also suspended. 15791da177e4SLinus Torvalds * 15801da177e4SLinus Torvalds * Devices leave suspend state when the host wakes them up. Some devices 15811da177e4SLinus Torvalds * also support "remote wakeup", where the device can activate the USB 15821da177e4SLinus Torvalds * tree above them to deliver data, such as a keypress or packet. In 15831da177e4SLinus Torvalds * some cases, this wakes the USB host. 15841da177e4SLinus Torvalds */ 15851da177e4SLinus Torvalds static int hub_port_suspend(struct usb_hub *hub, int port1, 15861da177e4SLinus Torvalds struct usb_device *udev) 15871da177e4SLinus Torvalds { 15881da177e4SLinus Torvalds int status; 15891da177e4SLinus Torvalds 15901da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "suspend port %d\n", port1); 15911da177e4SLinus Torvalds 15921da177e4SLinus Torvalds /* enable remote wakeup when appropriate; this lets the device 15931da177e4SLinus Torvalds * wake up the upstream hub (including maybe the root hub). 15941da177e4SLinus Torvalds * 15951da177e4SLinus Torvalds * NOTE: OTG devices may issue remote wakeup (or SRP) even when 15961da177e4SLinus Torvalds * we don't explicitly enable it here. 15971da177e4SLinus Torvalds */ 1598645daaabSAlan Stern if (udev->do_remote_wakeup) { 15991da177e4SLinus Torvalds status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 16001da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 16011da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 16021da177e4SLinus Torvalds NULL, 0, 16031da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 16041da177e4SLinus Torvalds if (status) 16051da177e4SLinus Torvalds dev_dbg(&udev->dev, 16061da177e4SLinus Torvalds "won't remote wakeup, status %d\n", 16071da177e4SLinus Torvalds status); 16081da177e4SLinus Torvalds } 16091da177e4SLinus Torvalds 16101da177e4SLinus Torvalds /* see 7.1.7.6 */ 16111da177e4SLinus Torvalds status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); 16121da177e4SLinus Torvalds if (status) { 16131da177e4SLinus Torvalds dev_dbg(hub->intfdev, 16141da177e4SLinus Torvalds "can't suspend port %d, status %d\n", 16151da177e4SLinus Torvalds port1, status); 16161da177e4SLinus Torvalds /* paranoia: "should not happen" */ 16171da177e4SLinus Torvalds (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 16181da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 16191da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 16201da177e4SLinus Torvalds NULL, 0, 16211da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 16221da177e4SLinus Torvalds } else { 16231da177e4SLinus Torvalds /* device has up to 10 msec to fully suspend */ 1624645daaabSAlan Stern dev_dbg(&udev->dev, "usb %ssuspend\n", 1625645daaabSAlan Stern udev->auto_pm ? "auto-" : ""); 16261da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_SUSPENDED); 16271da177e4SLinus Torvalds msleep(10); 16281da177e4SLinus Torvalds } 16291da177e4SLinus Torvalds return status; 16301da177e4SLinus Torvalds } 16311da177e4SLinus Torvalds 16321da177e4SLinus Torvalds /* 16331da177e4SLinus Torvalds * Devices on USB hub ports have only one "suspend" state, corresponding 1634ba9d35fbSPavel Machek * to ACPI D2, "may cause the device to lose some context". 16351da177e4SLinus Torvalds * State transitions include: 16361da177e4SLinus Torvalds * 16371da177e4SLinus Torvalds * - suspend, resume ... when the VBUS power link stays live 16381da177e4SLinus Torvalds * - suspend, disconnect ... VBUS lost 16391da177e4SLinus Torvalds * 16401da177e4SLinus Torvalds * Once VBUS drop breaks the circuit, the port it's using has to go through 16411da177e4SLinus Torvalds * normal re-enumeration procedures, starting with enabling VBUS power. 16421da177e4SLinus Torvalds * Other than re-initializing the hub (plug/unplug, except for root hubs), 16431da177e4SLinus Torvalds * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 16441da177e4SLinus Torvalds * timer, no SRP, no requests through sysfs. 1645390a8c34SDavid Brownell * 1646390a8c34SDavid Brownell * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when 1647390a8c34SDavid Brownell * the root hub for their bus goes into global suspend ... so we don't 1648390a8c34SDavid Brownell * (falsely) update the device power state to say it suspended. 16491da177e4SLinus Torvalds */ 1650140d8f68SAlan Stern static int __usb_port_suspend (struct usb_device *udev, int port1) 16511da177e4SLinus Torvalds { 1652f3f3253dSDavid Brownell int status = 0; 16531da177e4SLinus Torvalds 16541da177e4SLinus Torvalds /* caller owns the udev device lock */ 16551da177e4SLinus Torvalds if (port1 < 0) 16561da177e4SLinus Torvalds return port1; 16571da177e4SLinus Torvalds 1658140d8f68SAlan Stern /* we change the device's upstream USB link, 1659140d8f68SAlan Stern * but root hubs have no upstream USB link. 16601da177e4SLinus Torvalds */ 1661f3f3253dSDavid Brownell if (udev->parent) 16621da177e4SLinus Torvalds status = hub_port_suspend(hdev_to_hub(udev->parent), port1, 16631da177e4SLinus Torvalds udev); 16642bf4086dSAlan Stern else { 1665645daaabSAlan Stern dev_dbg(&udev->dev, "usb %ssuspend\n", 1666645daaabSAlan Stern udev->auto_pm ? "auto-" : ""); 16672bf4086dSAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 16682bf4086dSAlan Stern } 16691da177e4SLinus Torvalds return status; 16701da177e4SLinus Torvalds } 16711da177e4SLinus Torvalds 16725edbfb7cSDavid Brownell /* 1673140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 16741da177e4SLinus Torvalds * @udev: device that's no longer in active use 16755edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 16761da177e4SLinus Torvalds * 16771da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 16781da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 16791da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 1680140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 16811da177e4SLinus Torvalds * to disconnect devices while they are suspended. 16821da177e4SLinus Torvalds * 1683390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 1684390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 1685390a8c34SDavid Brownell * 16861da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 16871da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 16881da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 16891da177e4SLinus Torvalds * 16901da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 16911da177e4SLinus Torvalds */ 1692140d8f68SAlan Stern int usb_port_suspend(struct usb_device *udev) 16931da177e4SLinus Torvalds { 1694140d8f68SAlan Stern return __usb_port_suspend(udev, udev->portnum); 16951da177e4SLinus Torvalds } 1696f3f3253dSDavid Brownell 16971da177e4SLinus Torvalds /* 1698390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 1699390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 1700390a8c34SDavid Brownell * special" resume" signaling. These routines kick in shortly after 17011da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 17021da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 17031da177e4SLinus Torvalds * in the tree that's rooted at this device. 17041da177e4SLinus Torvalds */ 1705140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 17061da177e4SLinus Torvalds { 17071da177e4SLinus Torvalds int status; 17081da177e4SLinus Torvalds u16 devstatus; 17091da177e4SLinus Torvalds 17101da177e4SLinus Torvalds /* caller owns the udev device lock */ 1711f3f3253dSDavid Brownell dev_dbg(&udev->dev, "finish resume\n"); 17121da177e4SLinus Torvalds 17131da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 17141da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 17151da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 17161da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 17171da177e4SLinus Torvalds */ 17181da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 17191da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 17201da177e4SLinus Torvalds : USB_STATE_ADDRESS); 17211da177e4SLinus Torvalds 17221da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 17231da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 17241da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 17251da177e4SLinus Torvalds */ 17261da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 1727b40b7a90SAlan Stern if (status >= 0) 1728b40b7a90SAlan Stern status = (status == 2 ? 0 : -ENODEV); 1729b40b7a90SAlan Stern 1730b40b7a90SAlan Stern if (status) 17311da177e4SLinus Torvalds dev_dbg(&udev->dev, 17321da177e4SLinus Torvalds "gone after usb resume? status %d\n", 17331da177e4SLinus Torvalds status); 17341da177e4SLinus Torvalds else if (udev->actconfig) { 17351da177e4SLinus Torvalds le16_to_cpus(&devstatus); 173655c52718SAlan Stern if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) 1737f3f3253dSDavid Brownell && udev->parent) { 17381da177e4SLinus Torvalds status = usb_control_msg(udev, 17391da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 17401da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, 17411da177e4SLinus Torvalds USB_RECIP_DEVICE, 17421da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 17431da177e4SLinus Torvalds NULL, 0, 17441da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 1745a8e7c565SAlan Stern if (status) 17461da177e4SLinus Torvalds dev_dbg(&udev->dev, "disable remote " 17471da177e4SLinus Torvalds "wakeup, status %d\n", status); 17484bf0ba86SAlan Stern } 17491da177e4SLinus Torvalds status = 0; 17501da177e4SLinus Torvalds 17511da177e4SLinus Torvalds } else if (udev->devnum <= 0) { 17521da177e4SLinus Torvalds dev_dbg(&udev->dev, "bogus resume!\n"); 17531da177e4SLinus Torvalds status = -EINVAL; 17541da177e4SLinus Torvalds } 17551da177e4SLinus Torvalds return status; 17561da177e4SLinus Torvalds } 17571da177e4SLinus Torvalds 17581da177e4SLinus Torvalds static int 17591da177e4SLinus Torvalds hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev) 17601da177e4SLinus Torvalds { 17611da177e4SLinus Torvalds int status; 1762d25450c6SAlan Stern u16 portchange, portstatus; 1763d25450c6SAlan Stern 1764d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 1765d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 1766d25450c6SAlan Stern if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND)) 1767d25450c6SAlan Stern goto SuspendCleared; 17681da177e4SLinus Torvalds 17691da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "resume port %d\n", port1); 17701da177e4SLinus Torvalds 1771d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 1772d5cbad4bSAlan Stern 17731da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 17741da177e4SLinus Torvalds status = clear_port_feature(hub->hdev, 17751da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 17761da177e4SLinus Torvalds if (status) { 17771da177e4SLinus Torvalds dev_dbg(hub->intfdev, 17781da177e4SLinus Torvalds "can't resume port %d, status %d\n", 17791da177e4SLinus Torvalds port1, status); 17801da177e4SLinus Torvalds } else { 17811da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 17821da177e4SLinus Torvalds if (udev) 1783645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 1784645daaabSAlan Stern udev->auto_pm ? "auto-" : ""); 17851da177e4SLinus Torvalds msleep(25); 17861da177e4SLinus Torvalds 17871da177e4SLinus Torvalds #define LIVE_FLAGS ( USB_PORT_STAT_POWER \ 17881da177e4SLinus Torvalds | USB_PORT_STAT_ENABLE \ 17891da177e4SLinus Torvalds | USB_PORT_STAT_CONNECTION) 17901da177e4SLinus Torvalds 17911da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 17921da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 17931da177e4SLinus Torvalds * sequence. 17941da177e4SLinus Torvalds */ 1795d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 1796d25450c6SAlan Stern SuspendCleared: 17971da177e4SLinus Torvalds if (status < 0 1798d25450c6SAlan Stern || (portstatus & LIVE_FLAGS) != LIVE_FLAGS 1799d25450c6SAlan Stern || (portstatus & USB_PORT_STAT_SUSPEND) != 0 18001da177e4SLinus Torvalds ) { 18011da177e4SLinus Torvalds dev_dbg(hub->intfdev, 18021da177e4SLinus Torvalds "port %d status %04x.%04x after resume, %d\n", 1803d25450c6SAlan Stern port1, portchange, portstatus, status); 180420307949SAlan Stern if (status >= 0) 180520307949SAlan Stern status = -ENODEV; 18061da177e4SLinus Torvalds } else { 180720307949SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 180820307949SAlan Stern clear_port_feature(hub->hdev, port1, 180920307949SAlan Stern USB_PORT_FEAT_C_SUSPEND); 18101da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 18111da177e4SLinus Torvalds msleep(10); 18121da177e4SLinus Torvalds if (udev) 1813140d8f68SAlan Stern status = finish_port_resume(udev); 18141da177e4SLinus Torvalds } 18151da177e4SLinus Torvalds } 18161da177e4SLinus Torvalds if (status < 0) 18171da177e4SLinus Torvalds hub_port_logical_disconnect(hub, port1); 18181da177e4SLinus Torvalds 1819d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 1820d5cbad4bSAlan Stern if (!hub->hdev->parent && !hub->busy_bits[0]) 1821d5cbad4bSAlan Stern usb_enable_root_hub_irq(hub->hdev->bus); 1822d5cbad4bSAlan Stern 18231da177e4SLinus Torvalds return status; 18241da177e4SLinus Torvalds } 18251da177e4SLinus Torvalds 18265edbfb7cSDavid Brownell /* 1827140d8f68SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 18281da177e4SLinus Torvalds * @udev: device to re-activate 18295edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 18301da177e4SLinus Torvalds * 18311da177e4SLinus Torvalds * This will re-activate the suspended device, increasing power usage 18321da177e4SLinus Torvalds * while letting drivers communicate again with its endpoints. 18331da177e4SLinus Torvalds * USB resume explicitly guarantees that the power session between 18341da177e4SLinus Torvalds * the host and the device is the same as it was when the device 18351da177e4SLinus Torvalds * suspended. 18361da177e4SLinus Torvalds * 18371da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 18381da177e4SLinus Torvalds */ 1839140d8f68SAlan Stern int usb_port_resume(struct usb_device *udev) 18401da177e4SLinus Torvalds { 1841d388dab7SAlan Stern int status; 18421da177e4SLinus Torvalds 1843140d8f68SAlan Stern /* we change the device's upstream USB link, 1844140d8f68SAlan Stern * but root hubs have no upstream USB link. 1845140d8f68SAlan Stern */ 1846f3f3253dSDavid Brownell if (udev->parent) { 18471da177e4SLinus Torvalds // NOTE this fails if parent is also suspended... 18481da177e4SLinus Torvalds status = hub_port_resume(hdev_to_hub(udev->parent), 184912c3da34SAlan Stern udev->portnum, udev); 1850645daaabSAlan Stern } else { 1851645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 1852645daaabSAlan Stern udev->auto_pm ? "auto-" : ""); 1853140d8f68SAlan Stern status = finish_port_resume(udev); 1854645daaabSAlan Stern } 1855f3f3253dSDavid Brownell if (status < 0) 1856a8e7c565SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 18571da177e4SLinus Torvalds return status; 18581da177e4SLinus Torvalds } 18591da177e4SLinus Torvalds 18601da177e4SLinus Torvalds static int remote_wakeup(struct usb_device *udev) 18611da177e4SLinus Torvalds { 18621da177e4SLinus Torvalds int status = 0; 18631da177e4SLinus Torvalds 18649ad3d6ccSAlan Stern usb_lock_device(udev); 18651da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 1866645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 186794fcda1fSAlan Stern status = usb_autoresume_device(udev); 1868a8e7c565SAlan Stern 1869d25450c6SAlan Stern /* Give the interface drivers a chance to do something, 1870d25450c6SAlan Stern * then autosuspend the device again. */ 1871a8e7c565SAlan Stern if (status == 0) 187294fcda1fSAlan Stern usb_autosuspend_device(udev); 1873d25450c6SAlan Stern } 18749ad3d6ccSAlan Stern usb_unlock_device(udev); 18751da177e4SLinus Torvalds return status; 18761da177e4SLinus Torvalds } 18771da177e4SLinus Torvalds 1878d388dab7SAlan Stern #else /* CONFIG_USB_SUSPEND */ 1879d388dab7SAlan Stern 1880d388dab7SAlan Stern /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ 1881d388dab7SAlan Stern 1882d388dab7SAlan Stern int usb_port_suspend(struct usb_device *udev) 1883d388dab7SAlan Stern { 1884d388dab7SAlan Stern return 0; 1885d388dab7SAlan Stern } 1886d388dab7SAlan Stern 1887d388dab7SAlan Stern static inline int 1888d388dab7SAlan Stern finish_port_resume(struct usb_device *udev) 1889d388dab7SAlan Stern { 1890d388dab7SAlan Stern return 0; 1891d388dab7SAlan Stern } 1892d388dab7SAlan Stern 1893d388dab7SAlan Stern static inline int 1894d388dab7SAlan Stern hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev) 1895d388dab7SAlan Stern { 1896d388dab7SAlan Stern return 0; 1897d388dab7SAlan Stern } 1898d388dab7SAlan Stern 1899d388dab7SAlan Stern int usb_port_resume(struct usb_device *udev) 1900d388dab7SAlan Stern { 1901d388dab7SAlan Stern return 0; 1902d388dab7SAlan Stern } 1903d388dab7SAlan Stern 1904d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 1905d388dab7SAlan Stern { 1906d388dab7SAlan Stern return 0; 1907d388dab7SAlan Stern } 1908d388dab7SAlan Stern 1909d388dab7SAlan Stern #endif 1910d388dab7SAlan Stern 1911db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 19121da177e4SLinus Torvalds { 19131da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 19141da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 19151da177e4SLinus Torvalds unsigned port1; 191612f1ff83SAlan Stern int status = 0; 19171da177e4SLinus Torvalds 1918c9f89fa4SDavid Brownell /* fail if children aren't already suspended */ 19191da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 19201da177e4SLinus Torvalds struct usb_device *udev; 19211da177e4SLinus Torvalds 19221da177e4SLinus Torvalds udev = hdev->children [port1-1]; 1923114b368cSAlan Stern if (udev && msg.event == PM_EVENT_SUSPEND && 1924f3f3253dSDavid Brownell #ifdef CONFIG_USB_SUSPEND 1925114b368cSAlan Stern udev->state != USB_STATE_SUSPENDED 1926114b368cSAlan Stern #else 1927114b368cSAlan Stern udev->dev.power.power_state.event 1928114b368cSAlan Stern == PM_EVENT_ON 1929f3f3253dSDavid Brownell #endif 1930114b368cSAlan Stern ) { 1931645daaabSAlan Stern if (!hdev->auto_pm) 1932645daaabSAlan Stern dev_dbg(&intf->dev, "port %d nyet suspended\n", 1933645daaabSAlan Stern port1); 1934c9f89fa4SDavid Brownell return -EBUSY; 1935c9f89fa4SDavid Brownell } 19361da177e4SLinus Torvalds } 19371da177e4SLinus Torvalds 193840f122f3SAlan Stern dev_dbg(&intf->dev, "%s\n", __FUNCTION__); 193940f122f3SAlan Stern 1940c9f89fa4SDavid Brownell /* stop khubd and related activity */ 1941c9f89fa4SDavid Brownell hub_quiesce(hub); 194212f1ff83SAlan Stern 194312f1ff83SAlan Stern /* "global suspend" of the downstream HC-to-USB interface */ 194412f1ff83SAlan Stern if (!hdev->parent) { 194512f1ff83SAlan Stern status = hcd_bus_suspend(hdev->bus); 194612f1ff83SAlan Stern if (status != 0) { 194712f1ff83SAlan Stern dev_dbg(&hdev->dev, "'global' suspend %d\n", status); 194812f1ff83SAlan Stern hub_activate(hub); 194912f1ff83SAlan Stern } 195012f1ff83SAlan Stern } 195112f1ff83SAlan Stern return status; 19521da177e4SLinus Torvalds } 19531da177e4SLinus Torvalds 19541da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 19551da177e4SLinus Torvalds { 19561da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 195740f122f3SAlan Stern struct usb_device *hdev = hub->hdev; 19581da177e4SLinus Torvalds int status; 19591da177e4SLinus Torvalds 196040f122f3SAlan Stern dev_dbg(&intf->dev, "%s\n", __FUNCTION__); 196140f122f3SAlan Stern 1962f3f3253dSDavid Brownell /* "global resume" of the downstream HC-to-USB interface */ 1963f3f3253dSDavid Brownell if (!hdev->parent) { 1964f3f3253dSDavid Brownell struct usb_bus *bus = hdev->bus; 19650c0382e3SAlan Stern if (bus) { 19660c0382e3SAlan Stern status = hcd_bus_resume (bus); 1967f3f3253dSDavid Brownell if (status) { 1968f3f3253dSDavid Brownell dev_dbg(&intf->dev, "'global' resume %d\n", 1969f3f3253dSDavid Brownell status); 1970f3f3253dSDavid Brownell return status; 1971f3f3253dSDavid Brownell } 1972f3f3253dSDavid Brownell } else 1973f3f3253dSDavid Brownell return -EOPNOTSUPP; 1974f3f3253dSDavid Brownell if (status == 0) { 1975f3f3253dSDavid Brownell /* TRSMRCY = 10 msec */ 1976f3f3253dSDavid Brownell msleep(10); 1977f3f3253dSDavid Brownell } 1978f3f3253dSDavid Brownell } 1979f3f3253dSDavid Brownell 1980a8e7c565SAlan Stern /* tell khubd to look for changes on this hub */ 1981f3f3253dSDavid Brownell hub_activate(hub); 19821da177e4SLinus Torvalds return 0; 19831da177e4SLinus Torvalds } 19841da177e4SLinus Torvalds 1985d388dab7SAlan Stern #else /* CONFIG_PM */ 1986d388dab7SAlan Stern 1987d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 1988d388dab7SAlan Stern { 1989d388dab7SAlan Stern return 0; 1990d388dab7SAlan Stern } 1991d388dab7SAlan Stern 1992511366daSAndrew Morton #define hub_suspend NULL 1993511366daSAndrew Morton #define hub_resume NULL 1994d388dab7SAlan Stern #endif 1995d388dab7SAlan Stern 19961da177e4SLinus Torvalds void usb_resume_root_hub(struct usb_device *hdev) 19971da177e4SLinus Torvalds { 19981da177e4SLinus Torvalds struct usb_hub *hub = hdev_to_hub(hdev); 19991da177e4SLinus Torvalds 20001da177e4SLinus Torvalds kick_khubd(hub); 20011da177e4SLinus Torvalds } 20021da177e4SLinus Torvalds 20031da177e4SLinus Torvalds 20041da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 20051da177e4SLinus Torvalds * 20061da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 20071da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 20081da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 20091da177e4SLinus Torvalds * 20101da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 20111da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 20121da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 20131da177e4SLinus Torvalds * 20141da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 20151da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 20161da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 20171da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 20181da177e4SLinus Torvalds */ 20191da177e4SLinus Torvalds 20201da177e4SLinus Torvalds #define HUB_DEBOUNCE_TIMEOUT 1500 20211da177e4SLinus Torvalds #define HUB_DEBOUNCE_STEP 25 20221da177e4SLinus Torvalds #define HUB_DEBOUNCE_STABLE 100 20231da177e4SLinus Torvalds 20241da177e4SLinus Torvalds static int hub_port_debounce(struct usb_hub *hub, int port1) 20251da177e4SLinus Torvalds { 20261da177e4SLinus Torvalds int ret; 20271da177e4SLinus Torvalds int total_time, stable_time = 0; 20281da177e4SLinus Torvalds u16 portchange, portstatus; 20291da177e4SLinus Torvalds unsigned connection = 0xffff; 20301da177e4SLinus Torvalds 20311da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 20321da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 20331da177e4SLinus Torvalds if (ret < 0) 20341da177e4SLinus Torvalds return ret; 20351da177e4SLinus Torvalds 20361da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 20371da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 20381da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 20391da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 20401da177e4SLinus Torvalds break; 20411da177e4SLinus Torvalds } else { 20421da177e4SLinus Torvalds stable_time = 0; 20431da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 20441da177e4SLinus Torvalds } 20451da177e4SLinus Torvalds 20461da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 20471da177e4SLinus Torvalds clear_port_feature(hub->hdev, port1, 20481da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 20491da177e4SLinus Torvalds } 20501da177e4SLinus Torvalds 20511da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 20521da177e4SLinus Torvalds break; 20531da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 20541da177e4SLinus Torvalds } 20551da177e4SLinus Torvalds 20561da177e4SLinus Torvalds dev_dbg (hub->intfdev, 20571da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 20581da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 20591da177e4SLinus Torvalds 20601da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 20611da177e4SLinus Torvalds return -ETIMEDOUT; 20621da177e4SLinus Torvalds return portstatus; 20631da177e4SLinus Torvalds } 20641da177e4SLinus Torvalds 20651da177e4SLinus Torvalds static void ep0_reinit(struct usb_device *udev) 20661da177e4SLinus Torvalds { 20671da177e4SLinus Torvalds usb_disable_endpoint(udev, 0 + USB_DIR_IN); 20681da177e4SLinus Torvalds usb_disable_endpoint(udev, 0 + USB_DIR_OUT); 20691da177e4SLinus Torvalds udev->ep_in[0] = udev->ep_out[0] = &udev->ep0; 20701da177e4SLinus Torvalds } 20711da177e4SLinus Torvalds 20721da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 20731da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 20741da177e4SLinus Torvalds 20751da177e4SLinus Torvalds static int hub_set_address(struct usb_device *udev) 20761da177e4SLinus Torvalds { 20771da177e4SLinus Torvalds int retval; 20781da177e4SLinus Torvalds 20791da177e4SLinus Torvalds if (udev->devnum == 0) 20801da177e4SLinus Torvalds return -EINVAL; 20811da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 20821da177e4SLinus Torvalds return 0; 20831da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 20841da177e4SLinus Torvalds return -EINVAL; 20851da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 20861da177e4SLinus Torvalds USB_REQ_SET_ADDRESS, 0, udev->devnum, 0, 20871da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 20881da177e4SLinus Torvalds if (retval == 0) { 20891da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 20901da177e4SLinus Torvalds ep0_reinit(udev); 20911da177e4SLinus Torvalds } 20921da177e4SLinus Torvalds return retval; 20931da177e4SLinus Torvalds } 20941da177e4SLinus Torvalds 20951da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 20961da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 20971da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 20981da177e4SLinus Torvalds * 20991da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 21001da177e4SLinus Torvalds * usb_reset_device), the caller must own the device lock. For a 21011da177e4SLinus Torvalds * newly detected device that is not accessible through any global 21021da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 21031da177e4SLinus Torvalds */ 21041da177e4SLinus Torvalds static int 21051da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 21061da177e4SLinus Torvalds int retry_counter) 21071da177e4SLinus Torvalds { 21084186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 21091da177e4SLinus Torvalds 21101da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 21111da177e4SLinus Torvalds int i, j, retval; 21121da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 21131da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 211483a07196SInaky Perez-Gonzalez char *speed, *type; 21151da177e4SLinus Torvalds 21161da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 21171da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 21181da177e4SLinus Torvalds */ 21191da177e4SLinus Torvalds if (!hdev->parent) { 21201da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 21211da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 21221da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 21231da177e4SLinus Torvalds } 21241da177e4SLinus Torvalds 21251da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 21261da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 21271da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 21281da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 21291da177e4SLinus Torvalds 21304186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 21311da177e4SLinus Torvalds 21321da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 21331da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 21341da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 21351da177e4SLinus Torvalds goto fail; 21361da177e4SLinus Torvalds /* success, speed is known */ 21371da177e4SLinus Torvalds retval = -ENODEV; 21381da177e4SLinus Torvalds 21391da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 21401da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 21411da177e4SLinus Torvalds goto fail; 21421da177e4SLinus Torvalds } 21431da177e4SLinus Torvalds oldspeed = udev->speed; 21441da177e4SLinus Torvalds 21451da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 21461da177e4SLinus Torvalds * it's fixed size except for full speed devices. 21475bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 21485bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 21491da177e4SLinus Torvalds */ 21501da177e4SLinus Torvalds switch (udev->speed) { 21515bb6e0aeSInaky Perez-Gonzalez case USB_SPEED_VARIABLE: /* fixed at 512 */ 21525bb6e0aeSInaky Perez-Gonzalez udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512); 21535bb6e0aeSInaky Perez-Gonzalez break; 21541da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 21551da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); 21561da177e4SLinus Torvalds break; 21571da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 21581da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 21591da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 21601da177e4SLinus Torvalds * then correct our initial guess. 21611da177e4SLinus Torvalds */ 21621da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); 21631da177e4SLinus Torvalds break; 21641da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 21651da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8); 21661da177e4SLinus Torvalds break; 21671da177e4SLinus Torvalds default: 21681da177e4SLinus Torvalds goto fail; 21691da177e4SLinus Torvalds } 21701da177e4SLinus Torvalds 217183a07196SInaky Perez-Gonzalez type = ""; 217283a07196SInaky Perez-Gonzalez switch (udev->speed) { 21731da177e4SLinus Torvalds case USB_SPEED_LOW: speed = "low"; break; 21741da177e4SLinus Torvalds case USB_SPEED_FULL: speed = "full"; break; 21751da177e4SLinus Torvalds case USB_SPEED_HIGH: speed = "high"; break; 217683a07196SInaky Perez-Gonzalez case USB_SPEED_VARIABLE: 217783a07196SInaky Perez-Gonzalez speed = "variable"; 217883a07196SInaky Perez-Gonzalez type = "Wireless "; 217983a07196SInaky Perez-Gonzalez break; 21801da177e4SLinus Torvalds default: speed = "?"; break; 218183a07196SInaky Perez-Gonzalez } 218283a07196SInaky Perez-Gonzalez dev_info (&udev->dev, 218383a07196SInaky Perez-Gonzalez "%s %s speed %sUSB device using %s and address %d\n", 218483a07196SInaky Perez-Gonzalez (udev->config) ? "reset" : "new", speed, type, 218583a07196SInaky Perez-Gonzalez udev->bus->controller->driver->name, udev->devnum); 21861da177e4SLinus Torvalds 21871da177e4SLinus Torvalds /* Set up TT records, if needed */ 21881da177e4SLinus Torvalds if (hdev->tt) { 21891da177e4SLinus Torvalds udev->tt = hdev->tt; 21901da177e4SLinus Torvalds udev->ttport = hdev->ttport; 21911da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 21921da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 21931da177e4SLinus Torvalds udev->tt = &hub->tt; 21941da177e4SLinus Torvalds udev->ttport = port1; 21951da177e4SLinus Torvalds } 21961da177e4SLinus Torvalds 21971da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 21981da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 21991da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 22001da177e4SLinus Torvalds * Change it cautiously. 22011da177e4SLinus Torvalds * 22021da177e4SLinus Torvalds * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 22031da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 22041da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 22051da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 22061da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 22071da177e4SLinus Torvalds * value. 22081da177e4SLinus Torvalds */ 22091da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 22101da177e4SLinus Torvalds if (USE_NEW_SCHEME(retry_counter)) { 22111da177e4SLinus Torvalds struct usb_device_descriptor *buf; 22121da177e4SLinus Torvalds int r = 0; 22131da177e4SLinus Torvalds 22141da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 22151da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 22161da177e4SLinus Torvalds if (!buf) { 22171da177e4SLinus Torvalds retval = -ENOMEM; 22181da177e4SLinus Torvalds continue; 22191da177e4SLinus Torvalds } 22201da177e4SLinus Torvalds 22211da177e4SLinus Torvalds /* Use a short timeout the first time through, 22221da177e4SLinus Torvalds * so that recalcitrant full-speed devices with 22231da177e4SLinus Torvalds * 8- or 16-byte ep0-maxpackets won't slow things 22241da177e4SLinus Torvalds * down tremendously by NAKing the unexpectedly 22251da177e4SLinus Torvalds * early status stage. Also, retry on all errors; 22261da177e4SLinus Torvalds * some devices are flakey. 22275bb6e0aeSInaky Perez-Gonzalez * 255 is for WUSB devices, we actually need to use 512. 22285bb6e0aeSInaky Perez-Gonzalez * WUSB1.0[4.8.1]. 22291da177e4SLinus Torvalds */ 22301da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 22311da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 22321da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 22331da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 22341da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 22351da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 22361da177e4SLinus Torvalds (i ? USB_CTRL_GET_TIMEOUT : 1000)); 22371da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 22385bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 22391da177e4SLinus Torvalds if (buf->bDescriptorType == 22401da177e4SLinus Torvalds USB_DT_DEVICE) { 22411da177e4SLinus Torvalds r = 0; 22421da177e4SLinus Torvalds break; 22431da177e4SLinus Torvalds } 22441da177e4SLinus Torvalds /* FALL THROUGH */ 22451da177e4SLinus Torvalds default: 22461da177e4SLinus Torvalds if (r == 0) 22471da177e4SLinus Torvalds r = -EPROTO; 22481da177e4SLinus Torvalds break; 22491da177e4SLinus Torvalds } 22501da177e4SLinus Torvalds if (r == 0) 22511da177e4SLinus Torvalds break; 22521da177e4SLinus Torvalds } 22531da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 22541da177e4SLinus Torvalds buf->bMaxPacketSize0; 22551da177e4SLinus Torvalds kfree(buf); 22561da177e4SLinus Torvalds 22571da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 22581da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 22591da177e4SLinus Torvalds goto fail; 22601da177e4SLinus Torvalds if (oldspeed != udev->speed) { 22611da177e4SLinus Torvalds dev_dbg(&udev->dev, 22621da177e4SLinus Torvalds "device reset changed speed!\n"); 22631da177e4SLinus Torvalds retval = -ENODEV; 22641da177e4SLinus Torvalds goto fail; 22651da177e4SLinus Torvalds } 22661da177e4SLinus Torvalds if (r) { 22671da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor " 22681da177e4SLinus Torvalds "read/%s, error %d\n", 22691da177e4SLinus Torvalds "64", r); 22701da177e4SLinus Torvalds retval = -EMSGSIZE; 22711da177e4SLinus Torvalds continue; 22721da177e4SLinus Torvalds } 22731da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 22741da177e4SLinus Torvalds } 22751da177e4SLinus Torvalds 22761da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 22771da177e4SLinus Torvalds retval = hub_set_address(udev); 22781da177e4SLinus Torvalds if (retval >= 0) 22791da177e4SLinus Torvalds break; 22801da177e4SLinus Torvalds msleep(200); 22811da177e4SLinus Torvalds } 22821da177e4SLinus Torvalds if (retval < 0) { 22831da177e4SLinus Torvalds dev_err(&udev->dev, 22841da177e4SLinus Torvalds "device not accepting address %d, error %d\n", 22851da177e4SLinus Torvalds udev->devnum, retval); 22861da177e4SLinus Torvalds goto fail; 22871da177e4SLinus Torvalds } 22881da177e4SLinus Torvalds 22891da177e4SLinus Torvalds /* cope with hardware quirkiness: 22901da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 22911da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 22921da177e4SLinus Torvalds */ 22931da177e4SLinus Torvalds msleep(10); 22941da177e4SLinus Torvalds if (USE_NEW_SCHEME(retry_counter)) 22951da177e4SLinus Torvalds break; 22961da177e4SLinus Torvalds 22971da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 22981da177e4SLinus Torvalds if (retval < 8) { 22991da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor " 23001da177e4SLinus Torvalds "read/%s, error %d\n", 23011da177e4SLinus Torvalds "8", retval); 23021da177e4SLinus Torvalds if (retval >= 0) 23031da177e4SLinus Torvalds retval = -EMSGSIZE; 23041da177e4SLinus Torvalds } else { 23051da177e4SLinus Torvalds retval = 0; 23061da177e4SLinus Torvalds break; 23071da177e4SLinus Torvalds } 23081da177e4SLinus Torvalds } 23091da177e4SLinus Torvalds if (retval) 23101da177e4SLinus Torvalds goto fail; 23111da177e4SLinus Torvalds 23125bb6e0aeSInaky Perez-Gonzalez i = udev->descriptor.bMaxPacketSize0 == 0xff? 23135bb6e0aeSInaky Perez-Gonzalez 512 : udev->descriptor.bMaxPacketSize0; 23141da177e4SLinus Torvalds if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { 23151da177e4SLinus Torvalds if (udev->speed != USB_SPEED_FULL || 23161da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 23171da177e4SLinus Torvalds dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); 23181da177e4SLinus Torvalds retval = -EMSGSIZE; 23191da177e4SLinus Torvalds goto fail; 23201da177e4SLinus Torvalds } 23211da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 23221da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 23231da177e4SLinus Torvalds ep0_reinit(udev); 23241da177e4SLinus Torvalds } 23251da177e4SLinus Torvalds 23261da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 23271da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 23281da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor read/%s, error %d\n", 23291da177e4SLinus Torvalds "all", retval); 23301da177e4SLinus Torvalds if (retval >= 0) 23311da177e4SLinus Torvalds retval = -ENOMSG; 23321da177e4SLinus Torvalds goto fail; 23331da177e4SLinus Torvalds } 23341da177e4SLinus Torvalds 23351da177e4SLinus Torvalds retval = 0; 23361da177e4SLinus Torvalds 23371da177e4SLinus Torvalds fail: 23381da177e4SLinus Torvalds if (retval) 23391da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 23404186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 23411da177e4SLinus Torvalds return retval; 23421da177e4SLinus Torvalds } 23431da177e4SLinus Torvalds 23441da177e4SLinus Torvalds static void 23451da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 23461da177e4SLinus Torvalds { 23471da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 23481da177e4SLinus Torvalds int status; 23491da177e4SLinus Torvalds 2350e94b1766SChristoph Lameter qual = kmalloc (sizeof *qual, GFP_KERNEL); 23511da177e4SLinus Torvalds if (qual == NULL) 23521da177e4SLinus Torvalds return; 23531da177e4SLinus Torvalds 23541da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 23551da177e4SLinus Torvalds qual, sizeof *qual); 23561da177e4SLinus Torvalds if (status == sizeof *qual) { 23571da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 23581da177e4SLinus Torvalds "connect to a high speed hub\n"); 23591da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 23601da177e4SLinus Torvalds if (hub->has_indicators) { 23611da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 2362c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 23631da177e4SLinus Torvalds } 23641da177e4SLinus Torvalds } 23651da177e4SLinus Torvalds kfree(qual); 23661da177e4SLinus Torvalds } 23671da177e4SLinus Torvalds 23681da177e4SLinus Torvalds static unsigned 23691da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 23701da177e4SLinus Torvalds { 23711da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 23721da177e4SLinus Torvalds int remaining; 237355c52718SAlan Stern int port1; 23741da177e4SLinus Torvalds 237555c52718SAlan Stern if (!hub->limited_power) 23761da177e4SLinus Torvalds return 0; 23771da177e4SLinus Torvalds 237855c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 237955c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 238055c52718SAlan Stern struct usb_device *udev = hdev->children[port1 - 1]; 238155c52718SAlan Stern int delta; 23821da177e4SLinus Torvalds 23831da177e4SLinus Torvalds if (!udev) 23841da177e4SLinus Torvalds continue; 23851da177e4SLinus Torvalds 238655c52718SAlan Stern /* Unconfigured devices may not use more than 100mA, 238755c52718SAlan Stern * or 8mA for OTG ports */ 23881da177e4SLinus Torvalds if (udev->actconfig) 238955c52718SAlan Stern delta = udev->actconfig->desc.bMaxPower * 2; 239055c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 239155c52718SAlan Stern delta = 100; 23921da177e4SLinus Torvalds else 239355c52718SAlan Stern delta = 8; 239455c52718SAlan Stern if (delta > hub->mA_per_port) 239555c52718SAlan Stern dev_warn(&udev->dev, "%dmA is over %umA budget " 239655c52718SAlan Stern "for port %d!\n", 239755c52718SAlan Stern delta, hub->mA_per_port, port1); 23981da177e4SLinus Torvalds remaining -= delta; 23991da177e4SLinus Torvalds } 24001da177e4SLinus Torvalds if (remaining < 0) { 240155c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 240255c52718SAlan Stern - remaining); 24031da177e4SLinus Torvalds remaining = 0; 24041da177e4SLinus Torvalds } 24051da177e4SLinus Torvalds return remaining; 24061da177e4SLinus Torvalds } 24071da177e4SLinus Torvalds 24081da177e4SLinus Torvalds /* Handle physical or logical connection change events. 24091da177e4SLinus Torvalds * This routine is called when: 24101da177e4SLinus Torvalds * a port connection-change occurs; 24111da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 24121da177e4SLinus Torvalds * usb_reset_device() encounters changed descriptors (as from 24131da177e4SLinus Torvalds * a firmware download) 24141da177e4SLinus Torvalds * caller already locked the hub 24151da177e4SLinus Torvalds */ 24161da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 24171da177e4SLinus Torvalds u16 portstatus, u16 portchange) 24181da177e4SLinus Torvalds { 24191da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 24201da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 242174ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 24221da177e4SLinus Torvalds int status, i; 24231da177e4SLinus Torvalds 24241da177e4SLinus Torvalds dev_dbg (hub_dev, 24251da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 24261da177e4SLinus Torvalds port1, portstatus, portchange, portspeed (portstatus)); 24271da177e4SLinus Torvalds 24281da177e4SLinus Torvalds if (hub->has_indicators) { 24291da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 24301da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 24311da177e4SLinus Torvalds } 24321da177e4SLinus Torvalds 24331da177e4SLinus Torvalds /* Disconnect any existing devices under this port */ 24341da177e4SLinus Torvalds if (hdev->children[port1-1]) 24351da177e4SLinus Torvalds usb_disconnect(&hdev->children[port1-1]); 24361da177e4SLinus Torvalds clear_bit(port1, hub->change_bits); 24371da177e4SLinus Torvalds 24381da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 24391da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 24401da177e4SLinus Torvalds if (hdev->bus->is_b_host) 24411da177e4SLinus Torvalds portchange &= ~USB_PORT_STAT_C_CONNECTION; 24421da177e4SLinus Torvalds #endif 24431da177e4SLinus Torvalds 24441da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 24451da177e4SLinus Torvalds status = hub_port_debounce(hub, port1); 24467bc4b81dSOliver Neukum if (status < 0 && printk_ratelimit()) { 24471da177e4SLinus Torvalds dev_err (hub_dev, 24481da177e4SLinus Torvalds "connect-debounce failed, port %d disabled\n", 24491da177e4SLinus Torvalds port1); 24501da177e4SLinus Torvalds goto done; 24511da177e4SLinus Torvalds } 24521da177e4SLinus Torvalds portstatus = status; 24531da177e4SLinus Torvalds } 24541da177e4SLinus Torvalds 24551da177e4SLinus Torvalds /* Return now if nothing is connected */ 24561da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) { 24571da177e4SLinus Torvalds 24581da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 245974ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 24601da177e4SLinus Torvalds && !(portstatus & (1 << USB_PORT_FEAT_POWER))) 24611da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 24621da177e4SLinus Torvalds 24631da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 24641da177e4SLinus Torvalds goto done; 24651da177e4SLinus Torvalds return; 24661da177e4SLinus Torvalds } 24671da177e4SLinus Torvalds 24681da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 24691da177e4SLinus Torvalds /* If something is connected, but the port is suspended, wake it up. */ 24701da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_SUSPEND) { 24711da177e4SLinus Torvalds status = hub_port_resume(hub, port1, NULL); 24721da177e4SLinus Torvalds if (status < 0) { 24731da177e4SLinus Torvalds dev_dbg(hub_dev, 24741da177e4SLinus Torvalds "can't clear suspend on port %d; %d\n", 24751da177e4SLinus Torvalds port1, status); 24761da177e4SLinus Torvalds goto done; 24771da177e4SLinus Torvalds } 24781da177e4SLinus Torvalds } 24791da177e4SLinus Torvalds #endif 24801da177e4SLinus Torvalds 24811da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 24821da177e4SLinus Torvalds struct usb_device *udev; 24831da177e4SLinus Torvalds 24841da177e4SLinus Torvalds /* reallocate for each attempt, since references 24851da177e4SLinus Torvalds * to the previous one can escape in various ways 24861da177e4SLinus Torvalds */ 24871da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 24881da177e4SLinus Torvalds if (!udev) { 24891da177e4SLinus Torvalds dev_err (hub_dev, 24901da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 24911da177e4SLinus Torvalds port1); 24921da177e4SLinus Torvalds goto done; 24931da177e4SLinus Torvalds } 24941da177e4SLinus Torvalds 24951da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 24961da177e4SLinus Torvalds udev->speed = USB_SPEED_UNKNOWN; 249755c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 2498b6956ffaSAlan Stern udev->level = hdev->level + 1; 24991da177e4SLinus Torvalds 25001da177e4SLinus Torvalds /* set the address */ 25011da177e4SLinus Torvalds choose_address(udev); 25021da177e4SLinus Torvalds if (udev->devnum <= 0) { 25031da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 25041da177e4SLinus Torvalds goto loop; 25051da177e4SLinus Torvalds } 25061da177e4SLinus Torvalds 25071da177e4SLinus Torvalds /* reset and get descriptor */ 25081da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 25091da177e4SLinus Torvalds if (status < 0) 25101da177e4SLinus Torvalds goto loop; 25111da177e4SLinus Torvalds 25121da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 25131da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 25141da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 25151da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 25161da177e4SLinus Torvalds * on the parent. 25171da177e4SLinus Torvalds */ 25181da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 251955c52718SAlan Stern && udev->bus_mA <= 100) { 25201da177e4SLinus Torvalds u16 devstat; 25211da177e4SLinus Torvalds 25221da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 25231da177e4SLinus Torvalds &devstat); 252455c52718SAlan Stern if (status < 2) { 25251da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 25261da177e4SLinus Torvalds goto loop_disable; 25271da177e4SLinus Torvalds } 252855c52718SAlan Stern le16_to_cpus(&devstat); 25291da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 25301da177e4SLinus Torvalds dev_err(&udev->dev, 25311da177e4SLinus Torvalds "can't connect bus-powered hub " 25321da177e4SLinus Torvalds "to this port\n"); 25331da177e4SLinus Torvalds if (hub->has_indicators) { 25341da177e4SLinus Torvalds hub->indicator[port1-1] = 25351da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 2536c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 25371da177e4SLinus Torvalds } 25381da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 25391da177e4SLinus Torvalds goto loop_disable; 25401da177e4SLinus Torvalds } 25411da177e4SLinus Torvalds } 25421da177e4SLinus Torvalds 25431da177e4SLinus Torvalds /* check for devices running slower than they could */ 25441da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 25451da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 25461da177e4SLinus Torvalds && highspeed_hubs != 0) 25471da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 25481da177e4SLinus Torvalds 25491da177e4SLinus Torvalds /* Store the parent's children[] pointer. At this point 25501da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 25511da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 25521da177e4SLinus Torvalds */ 25531da177e4SLinus Torvalds status = 0; 25541da177e4SLinus Torvalds 25551da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 25561da177e4SLinus Torvalds * been disconnected; we would race with the 25571da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 25581da177e4SLinus Torvalds */ 25591da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 25601da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 25611da177e4SLinus Torvalds status = -ENOTCONN; 25621da177e4SLinus Torvalds else 25631da177e4SLinus Torvalds hdev->children[port1-1] = udev; 25641da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 25651da177e4SLinus Torvalds 25661da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 25671da177e4SLinus Torvalds if (!status) { 25681da177e4SLinus Torvalds status = usb_new_device(udev); 25691da177e4SLinus Torvalds if (status) { 25701da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 25711da177e4SLinus Torvalds hdev->children[port1-1] = NULL; 25721da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 25731da177e4SLinus Torvalds } 25741da177e4SLinus Torvalds } 25751da177e4SLinus Torvalds 25761da177e4SLinus Torvalds if (status) 25771da177e4SLinus Torvalds goto loop_disable; 25781da177e4SLinus Torvalds 25791da177e4SLinus Torvalds status = hub_power_remaining(hub); 25801da177e4SLinus Torvalds if (status) 258155c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 25821da177e4SLinus Torvalds 25831da177e4SLinus Torvalds return; 25841da177e4SLinus Torvalds 25851da177e4SLinus Torvalds loop_disable: 25861da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 25871da177e4SLinus Torvalds loop: 25881da177e4SLinus Torvalds ep0_reinit(udev); 25891da177e4SLinus Torvalds release_address(udev); 25901da177e4SLinus Torvalds usb_put_dev(udev); 25911da177e4SLinus Torvalds if (status == -ENOTCONN) 25921da177e4SLinus Torvalds break; 25931da177e4SLinus Torvalds } 25941da177e4SLinus Torvalds 25951da177e4SLinus Torvalds done: 25961da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 25971da177e4SLinus Torvalds } 25981da177e4SLinus Torvalds 25991da177e4SLinus Torvalds static void hub_events(void) 26001da177e4SLinus Torvalds { 26011da177e4SLinus Torvalds struct list_head *tmp; 26021da177e4SLinus Torvalds struct usb_device *hdev; 26031da177e4SLinus Torvalds struct usb_interface *intf; 26041da177e4SLinus Torvalds struct usb_hub *hub; 26051da177e4SLinus Torvalds struct device *hub_dev; 26061da177e4SLinus Torvalds u16 hubstatus; 26071da177e4SLinus Torvalds u16 hubchange; 26081da177e4SLinus Torvalds u16 portstatus; 26091da177e4SLinus Torvalds u16 portchange; 26101da177e4SLinus Torvalds int i, ret; 26111da177e4SLinus Torvalds int connect_change; 26121da177e4SLinus Torvalds 26131da177e4SLinus Torvalds /* 26141da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 26151da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 26161da177e4SLinus Torvalds * safe since we delete the hub from the event list. 26171da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 26181da177e4SLinus Torvalds */ 26191da177e4SLinus Torvalds while (1) { 26201da177e4SLinus Torvalds 26211da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 26221da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 26231da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 26241da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 26251da177e4SLinus Torvalds break; 26261da177e4SLinus Torvalds } 26271da177e4SLinus Torvalds 26281da177e4SLinus Torvalds tmp = hub_event_list.next; 26291da177e4SLinus Torvalds list_del_init(tmp); 26301da177e4SLinus Torvalds 26311da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 26321da177e4SLinus Torvalds hdev = hub->hdev; 26331da177e4SLinus Torvalds intf = to_usb_interface(hub->intfdev); 26341da177e4SLinus Torvalds hub_dev = &intf->dev; 26351da177e4SLinus Torvalds 263640f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 26371da177e4SLinus Torvalds hdev->state, hub->descriptor 26381da177e4SLinus Torvalds ? hub->descriptor->bNbrPorts 26391da177e4SLinus Torvalds : 0, 26401da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 26411da177e4SLinus Torvalds (u16) hub->change_bits[0], 264240f122f3SAlan Stern (u16) hub->event_bits[0]); 26431da177e4SLinus Torvalds 26441da177e4SLinus Torvalds usb_get_intf(intf); 26451da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 26461da177e4SLinus Torvalds 26471da177e4SLinus Torvalds /* Lock the device, then check to see if we were 26481da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 26491da177e4SLinus Torvalds if (locktree(hdev) < 0) { 26501da177e4SLinus Torvalds usb_put_intf(intf); 26511da177e4SLinus Torvalds continue; 26521da177e4SLinus Torvalds } 26531da177e4SLinus Torvalds if (hub != usb_get_intfdata(intf)) 26541da177e4SLinus Torvalds goto loop; 26551da177e4SLinus Torvalds 26561da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 26571da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 26587de18d8bSAlan Stern hub->error = -ENODEV; 26597de18d8bSAlan Stern hub_pre_reset(intf); 26601da177e4SLinus Torvalds goto loop; 26611da177e4SLinus Torvalds } 26621da177e4SLinus Torvalds 266340f122f3SAlan Stern /* Autoresume */ 266440f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 266540f122f3SAlan Stern if (ret) { 266640f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 26671da177e4SLinus Torvalds goto loop; 266840f122f3SAlan Stern } 266940f122f3SAlan Stern 267040f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 267140f122f3SAlan Stern if (hub->quiescing) 267240f122f3SAlan Stern goto loop_autopm; 26731da177e4SLinus Torvalds 26741da177e4SLinus Torvalds if (hub->error) { 26751da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 26761da177e4SLinus Torvalds hub->error); 26771da177e4SLinus Torvalds 26787de18d8bSAlan Stern ret = usb_reset_composite_device(hdev, intf); 26791da177e4SLinus Torvalds if (ret) { 26801da177e4SLinus Torvalds dev_dbg (hub_dev, 26811da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 268240f122f3SAlan Stern goto loop_autopm; 26831da177e4SLinus Torvalds } 26841da177e4SLinus Torvalds 26851da177e4SLinus Torvalds hub->nerrors = 0; 26861da177e4SLinus Torvalds hub->error = 0; 26871da177e4SLinus Torvalds } 26881da177e4SLinus Torvalds 26891da177e4SLinus Torvalds /* deal with port status changes */ 26901da177e4SLinus Torvalds for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { 26911da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 26921da177e4SLinus Torvalds continue; 26931da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 26941da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 26951da177e4SLinus Torvalds !connect_change && !hub->activating) 26961da177e4SLinus Torvalds continue; 26971da177e4SLinus Torvalds 26981da177e4SLinus Torvalds ret = hub_port_status(hub, i, 26991da177e4SLinus Torvalds &portstatus, &portchange); 27001da177e4SLinus Torvalds if (ret < 0) 27011da177e4SLinus Torvalds continue; 27021da177e4SLinus Torvalds 27031da177e4SLinus Torvalds if (hub->activating && !hdev->children[i-1] && 27041da177e4SLinus Torvalds (portstatus & 27051da177e4SLinus Torvalds USB_PORT_STAT_CONNECTION)) 27061da177e4SLinus Torvalds connect_change = 1; 27071da177e4SLinus Torvalds 27081da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 27091da177e4SLinus Torvalds clear_port_feature(hdev, i, 27101da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 27111da177e4SLinus Torvalds connect_change = 1; 27121da177e4SLinus Torvalds } 27131da177e4SLinus Torvalds 27141da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 27151da177e4SLinus Torvalds if (!connect_change) 27161da177e4SLinus Torvalds dev_dbg (hub_dev, 27171da177e4SLinus Torvalds "port %d enable change, " 27181da177e4SLinus Torvalds "status %08x\n", 27191da177e4SLinus Torvalds i, portstatus); 27201da177e4SLinus Torvalds clear_port_feature(hdev, i, 27211da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 27221da177e4SLinus Torvalds 27231da177e4SLinus Torvalds /* 27241da177e4SLinus Torvalds * EM interference sometimes causes badly 27251da177e4SLinus Torvalds * shielded USB devices to be shutdown by 27261da177e4SLinus Torvalds * the hub, this hack enables them again. 27271da177e4SLinus Torvalds * Works at least with mouse driver. 27281da177e4SLinus Torvalds */ 27291da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 27301da177e4SLinus Torvalds && !connect_change 27311da177e4SLinus Torvalds && hdev->children[i-1]) { 27321da177e4SLinus Torvalds dev_err (hub_dev, 27331da177e4SLinus Torvalds "port %i " 27341da177e4SLinus Torvalds "disabled by hub (EMI?), " 27351da177e4SLinus Torvalds "re-enabling...\n", 27361da177e4SLinus Torvalds i); 27371da177e4SLinus Torvalds connect_change = 1; 27381da177e4SLinus Torvalds } 27391da177e4SLinus Torvalds } 27401da177e4SLinus Torvalds 27411da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_SUSPEND) { 27421da177e4SLinus Torvalds clear_port_feature(hdev, i, 27431da177e4SLinus Torvalds USB_PORT_FEAT_C_SUSPEND); 27441da177e4SLinus Torvalds if (hdev->children[i-1]) { 27451da177e4SLinus Torvalds ret = remote_wakeup(hdev-> 27461da177e4SLinus Torvalds children[i-1]); 27471da177e4SLinus Torvalds if (ret < 0) 27481da177e4SLinus Torvalds connect_change = 1; 27491da177e4SLinus Torvalds } else { 27501da177e4SLinus Torvalds ret = -ENODEV; 27511da177e4SLinus Torvalds hub_port_disable(hub, i, 1); 27521da177e4SLinus Torvalds } 27531da177e4SLinus Torvalds dev_dbg (hub_dev, 27541da177e4SLinus Torvalds "resume on port %d, status %d\n", 27551da177e4SLinus Torvalds i, ret); 27561da177e4SLinus Torvalds } 27571da177e4SLinus Torvalds 27581da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 27591da177e4SLinus Torvalds dev_err (hub_dev, 27601da177e4SLinus Torvalds "over-current change on port %d\n", 27611da177e4SLinus Torvalds i); 27621da177e4SLinus Torvalds clear_port_feature(hdev, i, 27631da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 27641da177e4SLinus Torvalds hub_power_on(hub); 27651da177e4SLinus Torvalds } 27661da177e4SLinus Torvalds 27671da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 27681da177e4SLinus Torvalds dev_dbg (hub_dev, 27691da177e4SLinus Torvalds "reset change on port %d\n", 27701da177e4SLinus Torvalds i); 27711da177e4SLinus Torvalds clear_port_feature(hdev, i, 27721da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 27731da177e4SLinus Torvalds } 27741da177e4SLinus Torvalds 27751da177e4SLinus Torvalds if (connect_change) 27761da177e4SLinus Torvalds hub_port_connect_change(hub, i, 27771da177e4SLinus Torvalds portstatus, portchange); 27781da177e4SLinus Torvalds } /* end for i */ 27791da177e4SLinus Torvalds 27801da177e4SLinus Torvalds /* deal with hub status changes */ 27811da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 27821da177e4SLinus Torvalds ; /* do nothing */ 27831da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 27841da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 27851da177e4SLinus Torvalds else { 27861da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 27871da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 27881da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 278955c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 279055c52718SAlan Stern /* FIXME: Is this always true? */ 279155c52718SAlan Stern hub->limited_power = 0; 279255c52718SAlan Stern else 279355c52718SAlan Stern hub->limited_power = 1; 27941da177e4SLinus Torvalds } 27951da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 27961da177e4SLinus Torvalds dev_dbg (hub_dev, "overcurrent change\n"); 27971da177e4SLinus Torvalds msleep(500); /* Cool down */ 27981da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 27991da177e4SLinus Torvalds hub_power_on(hub); 28001da177e4SLinus Torvalds } 28011da177e4SLinus Torvalds } 28021da177e4SLinus Torvalds 28031da177e4SLinus Torvalds hub->activating = 0; 28041da177e4SLinus Torvalds 2805d5926ae7SAlan Stern /* If this is a root hub, tell the HCD it's okay to 2806d5926ae7SAlan Stern * re-enable port-change interrupts now. */ 2807d5cbad4bSAlan Stern if (!hdev->parent && !hub->busy_bits[0]) 2808d5926ae7SAlan Stern usb_enable_root_hub_irq(hdev->bus); 2809d5926ae7SAlan Stern 281040f122f3SAlan Stern loop_autopm: 281140f122f3SAlan Stern /* Allow autosuspend if we're not going to run again */ 281240f122f3SAlan Stern if (list_empty(&hub->event_list)) 281340f122f3SAlan Stern usb_autopm_enable(intf); 28141da177e4SLinus Torvalds loop: 28151da177e4SLinus Torvalds usb_unlock_device(hdev); 28161da177e4SLinus Torvalds usb_put_intf(intf); 28171da177e4SLinus Torvalds 28181da177e4SLinus Torvalds } /* end while (1) */ 28191da177e4SLinus Torvalds } 28201da177e4SLinus Torvalds 28211da177e4SLinus Torvalds static int hub_thread(void *__unused) 28221da177e4SLinus Torvalds { 28231da177e4SLinus Torvalds do { 28241da177e4SLinus Torvalds hub_events(); 28259c8d6178Sakpm@osdl.org wait_event_interruptible(khubd_wait, 28269c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 28279c8d6178Sakpm@osdl.org kthread_should_stop()); 28283e1d1d28SChristoph Lameter try_to_freeze(); 28299c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 28301da177e4SLinus Torvalds 28311da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 28329c8d6178Sakpm@osdl.org return 0; 28331da177e4SLinus Torvalds } 28341da177e4SLinus Torvalds 28351da177e4SLinus Torvalds static struct usb_device_id hub_id_table [] = { 28361da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 28371da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 28381da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 28391da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 28401da177e4SLinus Torvalds { } /* Terminating entry */ 28411da177e4SLinus Torvalds }; 28421da177e4SLinus Torvalds 28431da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 28441da177e4SLinus Torvalds 28451da177e4SLinus Torvalds static struct usb_driver hub_driver = { 28461da177e4SLinus Torvalds .name = "hub", 28471da177e4SLinus Torvalds .probe = hub_probe, 28481da177e4SLinus Torvalds .disconnect = hub_disconnect, 28491da177e4SLinus Torvalds .suspend = hub_suspend, 28501da177e4SLinus Torvalds .resume = hub_resume, 28517de18d8bSAlan Stern .pre_reset = hub_pre_reset, 28527de18d8bSAlan Stern .post_reset = hub_post_reset, 28531da177e4SLinus Torvalds .ioctl = hub_ioctl, 28541da177e4SLinus Torvalds .id_table = hub_id_table, 285540f122f3SAlan Stern .supports_autosuspend = 1, 28561da177e4SLinus Torvalds }; 28571da177e4SLinus Torvalds 28581da177e4SLinus Torvalds int usb_hub_init(void) 28591da177e4SLinus Torvalds { 28601da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 28611da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 28621da177e4SLinus Torvalds usbcore_name); 28631da177e4SLinus Torvalds return -1; 28641da177e4SLinus Torvalds } 28651da177e4SLinus Torvalds 28669c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 28679c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 28681da177e4SLinus Torvalds return 0; 28691da177e4SLinus Torvalds 28701da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 28711da177e4SLinus Torvalds usb_deregister(&hub_driver); 28721da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 28731da177e4SLinus Torvalds 28741da177e4SLinus Torvalds return -1; 28751da177e4SLinus Torvalds } 28761da177e4SLinus Torvalds 28771da177e4SLinus Torvalds void usb_hub_cleanup(void) 28781da177e4SLinus Torvalds { 28799c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 28801da177e4SLinus Torvalds 28811da177e4SLinus Torvalds /* 28821da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 28831da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 28841da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 28851da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 28861da177e4SLinus Torvalds * individual hub resources. -greg 28871da177e4SLinus Torvalds */ 28881da177e4SLinus Torvalds usb_deregister(&hub_driver); 28891da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 28901da177e4SLinus Torvalds 28911da177e4SLinus Torvalds static int config_descriptors_changed(struct usb_device *udev) 28921da177e4SLinus Torvalds { 28931da177e4SLinus Torvalds unsigned index; 28941da177e4SLinus Torvalds unsigned len = 0; 28951da177e4SLinus Torvalds struct usb_config_descriptor *buf; 28961da177e4SLinus Torvalds 28971da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 28981da177e4SLinus Torvalds if (len < le16_to_cpu(udev->config[index].desc.wTotalLength)) 28991da177e4SLinus Torvalds len = le16_to_cpu(udev->config[index].desc.wTotalLength); 29001da177e4SLinus Torvalds } 2901e94b1766SChristoph Lameter buf = kmalloc (len, GFP_KERNEL); 29021da177e4SLinus Torvalds if (buf == NULL) { 29031da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 29041da177e4SLinus Torvalds /* assume the worst */ 29051da177e4SLinus Torvalds return 1; 29061da177e4SLinus Torvalds } 29071da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 29081da177e4SLinus Torvalds int length; 29091da177e4SLinus Torvalds int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 29101da177e4SLinus Torvalds 29111da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 29121da177e4SLinus Torvalds old_length); 29131da177e4SLinus Torvalds if (length < old_length) { 29141da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 29151da177e4SLinus Torvalds index, length); 29161da177e4SLinus Torvalds break; 29171da177e4SLinus Torvalds } 29181da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 29191da177e4SLinus Torvalds != 0) { 29201da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 29211da177e4SLinus Torvalds index, buf->bConfigurationValue); 29221da177e4SLinus Torvalds break; 29231da177e4SLinus Torvalds } 29241da177e4SLinus Torvalds } 29251da177e4SLinus Torvalds kfree(buf); 29261da177e4SLinus Torvalds return index != udev->descriptor.bNumConfigurations; 29271da177e4SLinus Torvalds } 29281da177e4SLinus Torvalds 29291da177e4SLinus Torvalds /** 29301da177e4SLinus Torvalds * usb_reset_device - perform a USB port reset to reinitialize a device 29311da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 29321da177e4SLinus Torvalds * 293379efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 293479efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 293579efa097SAlan Stern * Use usb_reset_composite_device() instead. 29361da177e4SLinus Torvalds * 29371da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 29381da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 29391da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 29401da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 29411da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 29421da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 29431da177e4SLinus Torvalds * re-enumerated and probed all over again. 29441da177e4SLinus Torvalds * 29451da177e4SLinus Torvalds * Returns 0 if the reset succeeded, -ENODEV if the device has been 29461da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 29471da177e4SLinus Torvalds * if the reset wasn't even attempted. 29481da177e4SLinus Torvalds * 29491da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 29501da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 29511da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 29521da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 29531da177e4SLinus Torvalds */ 29541da177e4SLinus Torvalds int usb_reset_device(struct usb_device *udev) 29551da177e4SLinus Torvalds { 29561da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 29571da177e4SLinus Torvalds struct usb_hub *parent_hub; 29581da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 295912c3da34SAlan Stern int i, ret = 0; 296012c3da34SAlan Stern int port1 = udev->portnum; 29611da177e4SLinus Torvalds 29621da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 29631da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 29641da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 29651da177e4SLinus Torvalds udev->state); 29661da177e4SLinus Torvalds return -EINVAL; 29671da177e4SLinus Torvalds } 29681da177e4SLinus Torvalds 29691da177e4SLinus Torvalds if (!parent_hdev) { 29701da177e4SLinus Torvalds /* this requires hcd-specific logic; see OHCI hc_restart() */ 29711da177e4SLinus Torvalds dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__); 29721da177e4SLinus Torvalds return -EISDIR; 29731da177e4SLinus Torvalds } 29741da177e4SLinus Torvalds parent_hub = hdev_to_hub(parent_hdev); 29751da177e4SLinus Torvalds 29761da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 29771da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 29781da177e4SLinus Torvalds 29791da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 29801da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 29811da177e4SLinus Torvalds ep0_reinit(udev); 29821da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 29831da177e4SLinus Torvalds if (ret >= 0) 29841da177e4SLinus Torvalds break; 29851da177e4SLinus Torvalds } 29861da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 2987d5cbad4bSAlan Stern if (!parent_hdev->parent && !parent_hub->busy_bits[0]) 2988d5cbad4bSAlan Stern usb_enable_root_hub_irq(parent_hdev->bus); 2989d5cbad4bSAlan Stern 29901da177e4SLinus Torvalds if (ret < 0) 29911da177e4SLinus Torvalds goto re_enumerate; 29921da177e4SLinus Torvalds 29931da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 29941da177e4SLinus Torvalds if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor) 29951da177e4SLinus Torvalds || config_descriptors_changed (udev)) { 29961da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 29971da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 29981da177e4SLinus Torvalds goto re_enumerate; 29991da177e4SLinus Torvalds } 30001da177e4SLinus Torvalds 30011da177e4SLinus Torvalds if (!udev->actconfig) 30021da177e4SLinus Torvalds goto done; 30031da177e4SLinus Torvalds 30041da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 30051da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 30061da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 30071da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 30081da177e4SLinus Torvalds if (ret < 0) { 30091da177e4SLinus Torvalds dev_err(&udev->dev, 30101da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 30111da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 30121da177e4SLinus Torvalds goto re_enumerate; 30131da177e4SLinus Torvalds } 30141da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 30151da177e4SLinus Torvalds 30161da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 30171da177e4SLinus Torvalds struct usb_interface *intf = udev->actconfig->interface[i]; 30181da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 30191da177e4SLinus Torvalds 30201da177e4SLinus Torvalds /* set_interface resets host side toggle even 30211da177e4SLinus Torvalds * for altsetting zero. the interface may have no driver. 30221da177e4SLinus Torvalds */ 30231da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 30241da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 30251da177e4SLinus Torvalds desc->bAlternateSetting); 30261da177e4SLinus Torvalds if (ret < 0) { 30271da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 30281da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 30291da177e4SLinus Torvalds desc->bInterfaceNumber, 30301da177e4SLinus Torvalds desc->bAlternateSetting, 30311da177e4SLinus Torvalds ret); 30321da177e4SLinus Torvalds goto re_enumerate; 30331da177e4SLinus Torvalds } 30341da177e4SLinus Torvalds } 30351da177e4SLinus Torvalds 30361da177e4SLinus Torvalds done: 30371da177e4SLinus Torvalds return 0; 30381da177e4SLinus Torvalds 30391da177e4SLinus Torvalds re_enumerate: 30401da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 30411da177e4SLinus Torvalds return -ENODEV; 30421da177e4SLinus Torvalds } 3043140d8f68SAlan Stern EXPORT_SYMBOL(usb_reset_device); 304479efa097SAlan Stern 304579efa097SAlan Stern /** 304679efa097SAlan Stern * usb_reset_composite_device - warn interface drivers and perform a USB port reset 304779efa097SAlan Stern * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 304879efa097SAlan Stern * @iface: interface bound to the driver making the request (optional) 304979efa097SAlan Stern * 305079efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 305179efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 305279efa097SAlan Stern * the reset is over (using their post_reset method). 305379efa097SAlan Stern * 305479efa097SAlan Stern * Return value is the same as for usb_reset_device(). 305579efa097SAlan Stern * 305679efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 305779efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 305879efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 305979efa097SAlan Stern * the device using usb_lock_device_for_reset(). 306079efa097SAlan Stern * 306179efa097SAlan Stern * The interface locks are acquired during the pre_reset stage and released 306279efa097SAlan Stern * during the post_reset stage. However if iface is not NULL and is 306379efa097SAlan Stern * currently being probed, we assume that the caller already owns its 306479efa097SAlan Stern * lock. 306579efa097SAlan Stern */ 306679efa097SAlan Stern int usb_reset_composite_device(struct usb_device *udev, 306779efa097SAlan Stern struct usb_interface *iface) 306879efa097SAlan Stern { 306979efa097SAlan Stern int ret; 307079efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 307179efa097SAlan Stern 307279efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 307379efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 307479efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 307579efa097SAlan Stern udev->state); 307679efa097SAlan Stern return -EINVAL; 307779efa097SAlan Stern } 307879efa097SAlan Stern 3079645daaabSAlan Stern /* Prevent autosuspend during the reset */ 308094fcda1fSAlan Stern usb_autoresume_device(udev); 3081645daaabSAlan Stern 308279efa097SAlan Stern if (iface && iface->condition != USB_INTERFACE_BINDING) 308379efa097SAlan Stern iface = NULL; 308479efa097SAlan Stern 308579efa097SAlan Stern if (config) { 308679efa097SAlan Stern int i; 308779efa097SAlan Stern struct usb_interface *cintf; 308879efa097SAlan Stern struct usb_driver *drv; 308979efa097SAlan Stern 309079efa097SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 309179efa097SAlan Stern cintf = config->interface[i]; 309279efa097SAlan Stern if (cintf != iface) 309379efa097SAlan Stern down(&cintf->dev.sem); 309479efa097SAlan Stern if (device_is_registered(&cintf->dev) && 309579efa097SAlan Stern cintf->dev.driver) { 309679efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 309779efa097SAlan Stern if (drv->pre_reset) 309879efa097SAlan Stern (drv->pre_reset)(cintf); 309979efa097SAlan Stern } 310079efa097SAlan Stern } 310179efa097SAlan Stern } 310279efa097SAlan Stern 310379efa097SAlan Stern ret = usb_reset_device(udev); 310479efa097SAlan Stern 310579efa097SAlan Stern if (config) { 310679efa097SAlan Stern int i; 310779efa097SAlan Stern struct usb_interface *cintf; 310879efa097SAlan Stern struct usb_driver *drv; 310979efa097SAlan Stern 311079efa097SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 311179efa097SAlan Stern cintf = config->interface[i]; 311279efa097SAlan Stern if (device_is_registered(&cintf->dev) && 311379efa097SAlan Stern cintf->dev.driver) { 311479efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 311579efa097SAlan Stern if (drv->post_reset) 311679efa097SAlan Stern (drv->post_reset)(cintf); 311779efa097SAlan Stern } 311879efa097SAlan Stern if (cintf != iface) 311979efa097SAlan Stern up(&cintf->dev.sem); 312079efa097SAlan Stern } 312179efa097SAlan Stern } 312279efa097SAlan Stern 312394fcda1fSAlan Stern usb_autosuspend_device(udev); 312479efa097SAlan Stern return ret; 312579efa097SAlan Stern } 3126140d8f68SAlan Stern EXPORT_SYMBOL(usb_reset_composite_device); 3127