11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * USB hub driver. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * (C) Copyright 1999 Linus Torvalds 51da177e4SLinus Torvalds * (C) Copyright 1999 Johannes Erdfelt 61da177e4SLinus Torvalds * (C) Copyright 1999 Gregory P. Smith 71da177e4SLinus Torvalds * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds 111da177e4SLinus Torvalds #include <linux/kernel.h> 121da177e4SLinus Torvalds #include <linux/errno.h> 131da177e4SLinus Torvalds #include <linux/module.h> 141da177e4SLinus Torvalds #include <linux/moduleparam.h> 151da177e4SLinus Torvalds #include <linux/completion.h> 161da177e4SLinus Torvalds #include <linux/sched.h> 171da177e4SLinus Torvalds #include <linux/list.h> 181da177e4SLinus Torvalds #include <linux/slab.h> 191da177e4SLinus Torvalds #include <linux/ioctl.h> 201da177e4SLinus Torvalds #include <linux/usb.h> 211da177e4SLinus Torvalds #include <linux/usbdevice_fs.h> 229c8d6178Sakpm@osdl.org #include <linux/kthread.h> 234186ecf8SArjan van de Ven #include <linux/mutex.h> 247dfb7103SNigel Cunningham #include <linux/freezer.h> 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #include <asm/semaphore.h> 271da177e4SLinus Torvalds #include <asm/uaccess.h> 281da177e4SLinus Torvalds #include <asm/byteorder.h> 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds #include "usb.h" 311da177e4SLinus Torvalds #include "hcd.h" 321da177e4SLinus Torvalds #include "hub.h" 331da177e4SLinus Torvalds 3454515fe5SAlan Stern #ifdef CONFIG_USB_PERSIST 3554515fe5SAlan Stern #define USB_PERSIST 1 3654515fe5SAlan Stern #else 3754515fe5SAlan Stern #define USB_PERSIST 0 3854515fe5SAlan Stern #endif 3954515fe5SAlan Stern 40f2a383e4SGreg Kroah-Hartman /* if we are in debug mode, always announce new devices */ 41f2a383e4SGreg Kroah-Hartman #ifdef DEBUG 42f2a383e4SGreg Kroah-Hartman #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES 43f2a383e4SGreg Kroah-Hartman #define CONFIG_USB_ANNOUNCE_NEW_DEVICES 44f2a383e4SGreg Kroah-Hartman #endif 45f2a383e4SGreg Kroah-Hartman #endif 46f2a383e4SGreg Kroah-Hartman 471bb5f66bSAlan Stern struct usb_hub { 481bb5f66bSAlan Stern struct device *intfdev; /* the "interface" device */ 491bb5f66bSAlan Stern struct usb_device *hdev; 50e8054854SAlan Stern struct kref kref; 511bb5f66bSAlan Stern struct urb *urb; /* for interrupt polling pipe */ 521bb5f66bSAlan Stern 531bb5f66bSAlan Stern /* buffer for urb ... with extra space in case of babble */ 541bb5f66bSAlan Stern char (*buffer)[8]; 551bb5f66bSAlan Stern dma_addr_t buffer_dma; /* DMA address for buffer */ 561bb5f66bSAlan Stern union { 571bb5f66bSAlan Stern struct usb_hub_status hub; 581bb5f66bSAlan Stern struct usb_port_status port; 591bb5f66bSAlan Stern } *status; /* buffer for status reports */ 60db90e7a1SAlan Stern struct mutex status_mutex; /* for the status buffer */ 611bb5f66bSAlan Stern 621bb5f66bSAlan Stern int error; /* last reported error */ 631bb5f66bSAlan Stern int nerrors; /* track consecutive errors */ 641bb5f66bSAlan Stern 651bb5f66bSAlan Stern struct list_head event_list; /* hubs w/data or errs ready */ 661bb5f66bSAlan Stern unsigned long event_bits[1]; /* status change bitmask */ 671bb5f66bSAlan Stern unsigned long change_bits[1]; /* ports with logical connect 681bb5f66bSAlan Stern status change */ 691bb5f66bSAlan Stern unsigned long busy_bits[1]; /* ports being reset or 701bb5f66bSAlan Stern resumed */ 711bb5f66bSAlan Stern #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ 721bb5f66bSAlan Stern #error event_bits[] is too short! 731bb5f66bSAlan Stern #endif 741bb5f66bSAlan Stern 751bb5f66bSAlan Stern struct usb_hub_descriptor *descriptor; /* class descriptor */ 761bb5f66bSAlan Stern struct usb_tt tt; /* Transaction Translator */ 771bb5f66bSAlan Stern 781bb5f66bSAlan Stern unsigned mA_per_port; /* current for each child */ 791bb5f66bSAlan Stern 801bb5f66bSAlan Stern unsigned limited_power:1; 811bb5f66bSAlan Stern unsigned quiescing:1; 821bb5f66bSAlan Stern unsigned activating:1; 83e8054854SAlan Stern unsigned disconnected:1; 841bb5f66bSAlan Stern 851bb5f66bSAlan Stern unsigned has_indicators:1; 861bb5f66bSAlan Stern u8 indicator[USB_MAXCHILDREN]; 876d5aefb8SDavid Howells struct delayed_work leds; 881bb5f66bSAlan Stern }; 891bb5f66bSAlan Stern 901bb5f66bSAlan Stern 911da177e4SLinus Torvalds /* Protect struct usb_device->state and ->children members 929ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 931da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 941da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds /* khubd's worklist and its lock */ 971da177e4SLinus Torvalds static DEFINE_SPINLOCK(hub_event_lock); 981da177e4SLinus Torvalds static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds /* Wakes up khubd */ 1011da177e4SLinus Torvalds static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); 1021da177e4SLinus Torvalds 1039c8d6178Sakpm@osdl.org static struct task_struct *khubd_task; 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 1061da177e4SLinus Torvalds static int blinkenlights = 0; 1071da177e4SLinus Torvalds module_param (blinkenlights, bool, S_IRUGO); 1081da177e4SLinus Torvalds MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds /* 1111da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 1121da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 1131da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 1141da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 1151da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 1161da177e4SLinus Torvalds * following module parameters. 1171da177e4SLinus Torvalds * 1181da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 1191da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 1201da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 1211da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 1221da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 1231da177e4SLinus Torvalds */ 1241da177e4SLinus Torvalds static int old_scheme_first = 0; 1251da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 1261da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 1271da177e4SLinus Torvalds "start with the old device initialization scheme"); 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds static int use_both_schemes = 1; 1301da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 1311da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 1321da177e4SLinus Torvalds "try the other device initialization scheme if the " 1331da177e4SLinus Torvalds "first one fails"); 1341da177e4SLinus Torvalds 13532fe0198SAlan Stern /* Mutual exclusion for EHCI CF initialization. This interferes with 13632fe0198SAlan Stern * port reset on some companion controllers. 13732fe0198SAlan Stern */ 13832fe0198SAlan Stern DECLARE_RWSEM(ehci_cf_port_reset_rwsem); 13932fe0198SAlan Stern EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); 14032fe0198SAlan Stern 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds static inline char *portspeed(int portstatus) 1431da177e4SLinus Torvalds { 1441da177e4SLinus Torvalds if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) 1451da177e4SLinus Torvalds return "480 Mb/s"; 1461da177e4SLinus Torvalds else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) 1471da177e4SLinus Torvalds return "1.5 Mb/s"; 1481da177e4SLinus Torvalds else 1491da177e4SLinus Torvalds return "12 Mb/s"; 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 1531da177e4SLinus Torvalds static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev) 1541da177e4SLinus Torvalds { 1551da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1561da177e4SLinus Torvalds } 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 1591da177e4SLinus Torvalds static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) 1601da177e4SLinus Torvalds { 1611da177e4SLinus Torvalds int i, ret; 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 1641da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 1651da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 1661da177e4SLinus Torvalds USB_DT_HUB << 8, 0, data, size, 1671da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 1681da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 1691da177e4SLinus Torvalds return ret; 1701da177e4SLinus Torvalds } 1711da177e4SLinus Torvalds return -EINVAL; 1721da177e4SLinus Torvalds } 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds /* 1751da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 1761da177e4SLinus Torvalds */ 1771da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 1781da177e4SLinus Torvalds { 1791da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1801da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 1811da177e4SLinus Torvalds } 1821da177e4SLinus Torvalds 1831da177e4SLinus Torvalds /* 1841da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 1851da177e4SLinus Torvalds */ 1861da177e4SLinus Torvalds static int clear_port_feature(struct usb_device *hdev, int port1, int feature) 1871da177e4SLinus Torvalds { 1881da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1891da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 1901da177e4SLinus Torvalds NULL, 0, 1000); 1911da177e4SLinus Torvalds } 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds /* 1941da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 1951da177e4SLinus Torvalds */ 1961da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 1971da177e4SLinus Torvalds { 1981da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1991da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 2001da177e4SLinus Torvalds NULL, 0, 1000); 2011da177e4SLinus Torvalds } 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds /* 2041da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 2051da177e4SLinus Torvalds * for info about using port indicators 2061da177e4SLinus Torvalds */ 2071da177e4SLinus Torvalds static void set_port_led( 2081da177e4SLinus Torvalds struct usb_hub *hub, 2091da177e4SLinus Torvalds int port1, 2101da177e4SLinus Torvalds int selector 2111da177e4SLinus Torvalds ) 2121da177e4SLinus Torvalds { 2131da177e4SLinus Torvalds int status = set_port_feature(hub->hdev, (selector << 8) | port1, 2141da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 2151da177e4SLinus Torvalds if (status < 0) 2161da177e4SLinus Torvalds dev_dbg (hub->intfdev, 2171da177e4SLinus Torvalds "port %d indicator %s status %d\n", 2181da177e4SLinus Torvalds port1, 2191da177e4SLinus Torvalds ({ char *s; switch (selector) { 2201da177e4SLinus Torvalds case HUB_LED_AMBER: s = "amber"; break; 2211da177e4SLinus Torvalds case HUB_LED_GREEN: s = "green"; break; 2221da177e4SLinus Torvalds case HUB_LED_OFF: s = "off"; break; 2231da177e4SLinus Torvalds case HUB_LED_AUTO: s = "auto"; break; 2241da177e4SLinus Torvalds default: s = "??"; break; 2251da177e4SLinus Torvalds }; s; }), 2261da177e4SLinus Torvalds status); 2271da177e4SLinus Torvalds } 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 2301da177e4SLinus Torvalds 231c4028958SDavid Howells static void led_work (struct work_struct *work) 2321da177e4SLinus Torvalds { 233c4028958SDavid Howells struct usb_hub *hub = 234c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 2351da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 2361da177e4SLinus Torvalds unsigned i; 2371da177e4SLinus Torvalds unsigned changed = 0; 2381da177e4SLinus Torvalds int cursor = -1; 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 2411da177e4SLinus Torvalds return; 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds for (i = 0; i < hub->descriptor->bNbrPorts; i++) { 2441da177e4SLinus Torvalds unsigned selector, mode; 2451da177e4SLinus Torvalds 2461da177e4SLinus Torvalds /* 30%-50% duty cycle */ 2471da177e4SLinus Torvalds 2481da177e4SLinus Torvalds switch (hub->indicator[i]) { 2491da177e4SLinus Torvalds /* cycle marker */ 2501da177e4SLinus Torvalds case INDICATOR_CYCLE: 2511da177e4SLinus Torvalds cursor = i; 2521da177e4SLinus Torvalds selector = HUB_LED_AUTO; 2531da177e4SLinus Torvalds mode = INDICATOR_AUTO; 2541da177e4SLinus Torvalds break; 2551da177e4SLinus Torvalds /* blinking green = sw attention */ 2561da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 2571da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2581da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 2591da177e4SLinus Torvalds break; 2601da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 2611da177e4SLinus Torvalds selector = HUB_LED_OFF; 2621da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 2631da177e4SLinus Torvalds break; 2641da177e4SLinus Torvalds /* blinking amber = hw attention */ 2651da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 2661da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2671da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 2681da177e4SLinus Torvalds break; 2691da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 2701da177e4SLinus Torvalds selector = HUB_LED_OFF; 2711da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 2721da177e4SLinus Torvalds break; 2731da177e4SLinus Torvalds /* blink green/amber = reserved */ 2741da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 2751da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2761da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 2771da177e4SLinus Torvalds break; 2781da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 2791da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2801da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 2811da177e4SLinus Torvalds break; 2821da177e4SLinus Torvalds default: 2831da177e4SLinus Torvalds continue; 2841da177e4SLinus Torvalds } 2851da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 2861da177e4SLinus Torvalds changed = 1; 2871da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 2881da177e4SLinus Torvalds hub->indicator[i] = mode; 2891da177e4SLinus Torvalds } 2901da177e4SLinus Torvalds if (!changed && blinkenlights) { 2911da177e4SLinus Torvalds cursor++; 2921da177e4SLinus Torvalds cursor %= hub->descriptor->bNbrPorts; 2931da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 2941da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 2951da177e4SLinus Torvalds changed++; 2961da177e4SLinus Torvalds } 2971da177e4SLinus Torvalds if (changed) 2981da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 2991da177e4SLinus Torvalds } 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 3021da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 3031da177e4SLinus Torvalds #define USB_STS_RETRIES 5 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds /* 3061da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 3071da177e4SLinus Torvalds */ 3081da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 3091da177e4SLinus Torvalds struct usb_hub_status *data) 3101da177e4SLinus Torvalds { 3111da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 3141da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3151da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 3161da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 3171da177e4SLinus Torvalds } 3181da177e4SLinus Torvalds return status; 3191da177e4SLinus Torvalds } 3201da177e4SLinus Torvalds 3211da177e4SLinus Torvalds /* 3221da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 3231da177e4SLinus Torvalds */ 3241da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 3251da177e4SLinus Torvalds struct usb_port_status *data) 3261da177e4SLinus Torvalds { 3271da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 3301da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3311da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 3321da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 3331da177e4SLinus Torvalds } 3341da177e4SLinus Torvalds return status; 3351da177e4SLinus Torvalds } 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds static void kick_khubd(struct usb_hub *hub) 3381da177e4SLinus Torvalds { 3391da177e4SLinus Torvalds unsigned long flags; 3401da177e4SLinus Torvalds 34140f122f3SAlan Stern /* Suppress autosuspend until khubd runs */ 34240f122f3SAlan Stern to_usb_interface(hub->intfdev)->pm_usage_cnt = 1; 34340f122f3SAlan Stern 3441da177e4SLinus Torvalds spin_lock_irqsave(&hub_event_lock, flags); 3452e2c5eeaSRoel Kluin if (!hub->disconnected && list_empty(&hub->event_list)) { 3461da177e4SLinus Torvalds list_add_tail(&hub->event_list, &hub_event_list); 3471da177e4SLinus Torvalds wake_up(&khubd_wait); 3481da177e4SLinus Torvalds } 3491da177e4SLinus Torvalds spin_unlock_irqrestore(&hub_event_lock, flags); 3501da177e4SLinus Torvalds } 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds void usb_kick_khubd(struct usb_device *hdev) 3531da177e4SLinus Torvalds { 354e8054854SAlan Stern /* FIXME: What if hdev isn't bound to the hub driver? */ 3551da177e4SLinus Torvalds kick_khubd(hdev_to_hub(hdev)); 3561da177e4SLinus Torvalds } 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds 3591da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 3607d12e780SDavid Howells static void hub_irq(struct urb *urb) 3611da177e4SLinus Torvalds { 362ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 363e015268dSAlan Stern int status = urb->status; 3641da177e4SLinus Torvalds int i; 3651da177e4SLinus Torvalds unsigned long bits; 3661da177e4SLinus Torvalds 367e015268dSAlan Stern switch (status) { 3681da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 3691da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 3701da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 3711da177e4SLinus Torvalds return; 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds default: /* presumably an error */ 3741da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 375e015268dSAlan Stern dev_dbg (hub->intfdev, "transfer --> %d\n", status); 3761da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 3771da177e4SLinus Torvalds goto resubmit; 378e015268dSAlan Stern hub->error = status; 3791da177e4SLinus Torvalds /* FALL THROUGH */ 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds /* let khubd handle things */ 3821da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 3831da177e4SLinus Torvalds bits = 0; 3841da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 3851da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 3861da177e4SLinus Torvalds << (i*8); 3871da177e4SLinus Torvalds hub->event_bits[0] = bits; 3881da177e4SLinus Torvalds break; 3891da177e4SLinus Torvalds } 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds hub->nerrors = 0; 3921da177e4SLinus Torvalds 3931da177e4SLinus Torvalds /* Something happened, let khubd figure it out */ 3941da177e4SLinus Torvalds kick_khubd(hub); 3951da177e4SLinus Torvalds 3961da177e4SLinus Torvalds resubmit: 3971da177e4SLinus Torvalds if (hub->quiescing) 3981da177e4SLinus Torvalds return; 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 4011da177e4SLinus Torvalds && status != -ENODEV && status != -EPERM) 4021da177e4SLinus Torvalds dev_err (hub->intfdev, "resubmit --> %d\n", status); 4031da177e4SLinus Torvalds } 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 4061da177e4SLinus Torvalds static inline int 4071da177e4SLinus Torvalds hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) 4081da177e4SLinus Torvalds { 4091da177e4SLinus Torvalds return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 4101da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 4111da177e4SLinus Torvalds tt, NULL, 0, 1000); 4121da177e4SLinus Torvalds } 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds /* 4151da177e4SLinus Torvalds * enumeration blocks khubd for a long time. we use keventd instead, since 4161da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 4171da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 4181da177e4SLinus Torvalds * both can talk to the same hub concurrently. 4191da177e4SLinus Torvalds */ 420c4028958SDavid Howells static void hub_tt_kevent (struct work_struct *work) 4211da177e4SLinus Torvalds { 422c4028958SDavid Howells struct usb_hub *hub = 423c4028958SDavid Howells container_of(work, struct usb_hub, tt.kevent); 4241da177e4SLinus Torvalds unsigned long flags; 42555e5fdfaSMark Lord int limit = 100; 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 42855e5fdfaSMark Lord while (--limit && !list_empty (&hub->tt.clear_list)) { 4291da177e4SLinus Torvalds struct list_head *temp; 4301da177e4SLinus Torvalds struct usb_tt_clear *clear; 4311da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4321da177e4SLinus Torvalds int status; 4331da177e4SLinus Torvalds 4341da177e4SLinus Torvalds temp = hub->tt.clear_list.next; 4351da177e4SLinus Torvalds clear = list_entry (temp, struct usb_tt_clear, clear_list); 4361da177e4SLinus Torvalds list_del (&clear->clear_list); 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 4391da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 4401da177e4SLinus Torvalds status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 4411da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds if (status) 4441da177e4SLinus Torvalds dev_err (&hdev->dev, 4451da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 4461da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 4471da177e4SLinus Torvalds kfree(clear); 4481da177e4SLinus Torvalds } 4491da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 4501da177e4SLinus Torvalds } 4511da177e4SLinus Torvalds 4521da177e4SLinus Torvalds /** 4531da177e4SLinus Torvalds * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub 4541da177e4SLinus Torvalds * @udev: the device whose split transaction failed 4551da177e4SLinus Torvalds * @pipe: identifies the endpoint of the failed transaction 4561da177e4SLinus Torvalds * 4571da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 4581da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 4591da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 4601da177e4SLinus Torvalds * interrupt context. 4611da177e4SLinus Torvalds * 4621da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 4631da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 4641da177e4SLinus Torvalds */ 4651da177e4SLinus Torvalds void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe) 4661da177e4SLinus Torvalds { 4671da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 4681da177e4SLinus Torvalds unsigned long flags; 4691da177e4SLinus Torvalds struct usb_tt_clear *clear; 4701da177e4SLinus Torvalds 4711da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 4721da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 4731da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 4741da177e4SLinus Torvalds */ 47554e6ecb2SChristoph Lameter if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { 4761da177e4SLinus Torvalds dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 4771da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 4781da177e4SLinus Torvalds return; 4791da177e4SLinus Torvalds } 4801da177e4SLinus Torvalds 4811da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 4821da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 4831da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 4841da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 4851da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol (pipe) 4861da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 4871da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 4881da177e4SLinus Torvalds if (usb_pipein (pipe)) 4891da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 4921da177e4SLinus Torvalds spin_lock_irqsave (&tt->lock, flags); 4931da177e4SLinus Torvalds list_add_tail (&clear->clear_list, &tt->clear_list); 4941da177e4SLinus Torvalds schedule_work (&tt->kevent); 4951da177e4SLinus Torvalds spin_unlock_irqrestore (&tt->lock, flags); 4961da177e4SLinus Torvalds } 497782e70c6SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(usb_hub_tt_clear_buffer); 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds static void hub_power_on(struct usb_hub *hub) 5001da177e4SLinus Torvalds { 5011da177e4SLinus Torvalds int port1; 502b789696aSDavid Brownell unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 5034489a571SAlan Stern u16 wHubCharacteristics = 5044489a571SAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 5051da177e4SLinus Torvalds 5064489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 5074489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 5084489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 5094489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 5104489a571SAlan Stern * unless we send these messages to the hub. 5114489a571SAlan Stern */ 5124489a571SAlan Stern if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) 5131da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 5144489a571SAlan Stern else 5154489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 5164489a571SAlan Stern "non-switchable hub\n"); 5171da177e4SLinus Torvalds for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) 5184489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 5191da177e4SLinus Torvalds 520b789696aSDavid Brownell /* Wait at least 100 msec for power to become stable */ 521b789696aSDavid Brownell msleep(max(pgood_delay, (unsigned) 100)); 5221da177e4SLinus Torvalds } 5231da177e4SLinus Torvalds 52402c399eeSAlan Stern static void hub_quiesce(struct usb_hub *hub) 5251da177e4SLinus Torvalds { 526979d5199SDavid Brownell /* (nonblocking) khubd and related activity won't re-trigger */ 5271da177e4SLinus Torvalds hub->quiescing = 1; 528c9f89fa4SDavid Brownell hub->activating = 0; 529979d5199SDavid Brownell 530979d5199SDavid Brownell /* (blocking) stop khubd and related activity */ 5311da177e4SLinus Torvalds usb_kill_urb(hub->urb); 5321da177e4SLinus Torvalds if (hub->has_indicators) 533d48bd977SAlan Stern cancel_delayed_work_sync(&hub->leds); 534d48bd977SAlan Stern if (hub->tt.hub) 535d48bd977SAlan Stern cancel_work_sync(&hub->tt.kevent); 5361da177e4SLinus Torvalds } 5371da177e4SLinus Torvalds 5381da177e4SLinus Torvalds static void hub_activate(struct usb_hub *hub) 5391da177e4SLinus Torvalds { 5401da177e4SLinus Torvalds int status; 5411da177e4SLinus Torvalds 5421da177e4SLinus Torvalds hub->quiescing = 0; 5431da177e4SLinus Torvalds hub->activating = 1; 54440f122f3SAlan Stern 5451da177e4SLinus Torvalds status = usb_submit_urb(hub->urb, GFP_NOIO); 5461da177e4SLinus Torvalds if (status < 0) 5471da177e4SLinus Torvalds dev_err(hub->intfdev, "activate --> %d\n", status); 5481da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 5491da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds /* scan all ports ASAP */ 5521da177e4SLinus Torvalds kick_khubd(hub); 5531da177e4SLinus Torvalds } 5541da177e4SLinus Torvalds 5551da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 5561da177e4SLinus Torvalds u16 *status, u16 *change) 5571da177e4SLinus Torvalds { 5581da177e4SLinus Torvalds int ret; 5591da177e4SLinus Torvalds 560db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 5611da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 5621da177e4SLinus Torvalds if (ret < 0) 5631da177e4SLinus Torvalds dev_err (hub->intfdev, 5641da177e4SLinus Torvalds "%s failed (err = %d)\n", __FUNCTION__, ret); 5651da177e4SLinus Torvalds else { 5661da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 5671da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 5681da177e4SLinus Torvalds ret = 0; 5691da177e4SLinus Torvalds } 570db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 5711da177e4SLinus Torvalds return ret; 5721da177e4SLinus Torvalds } 5731da177e4SLinus Torvalds 5748b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 5758b28c752SAlan Stern { 5768b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 5770458d5b4SAlan Stern int ret = 0; 5788b28c752SAlan Stern 5790458d5b4SAlan Stern if (hdev->children[port1-1] && set_state) 5808b28c752SAlan Stern usb_set_device_state(hdev->children[port1-1], 5818b28c752SAlan Stern USB_STATE_NOTATTACHED); 5820458d5b4SAlan Stern if (!hub->error) 5838b28c752SAlan Stern ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); 5848b28c752SAlan Stern if (ret) 5858b28c752SAlan Stern dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 5868b28c752SAlan Stern port1, ret); 5878b28c752SAlan Stern return ret; 5888b28c752SAlan Stern } 5898b28c752SAlan Stern 5900458d5b4SAlan Stern /* 5910458d5b4SAlan Stern * Disable a port and mark a logical connnect-change event, so that some 5920458d5b4SAlan Stern * time later khubd will disconnect() any existing usb_device on the port 5930458d5b4SAlan Stern * and will re-enumerate if there actually is a device attached. 5940458d5b4SAlan Stern */ 5950458d5b4SAlan Stern static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 5967d069b7dSAlan Stern { 5970458d5b4SAlan Stern dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 5980458d5b4SAlan Stern hub_port_disable(hub, port1, 1); 5990458d5b4SAlan Stern 6000458d5b4SAlan Stern /* FIXME let caller ask to power down the port: 6010458d5b4SAlan Stern * - some devices won't enumerate without a VBUS power cycle 6020458d5b4SAlan Stern * - SRP saves power that way 6030458d5b4SAlan Stern * - ... new call, TBD ... 6040458d5b4SAlan Stern * That's easy if this hub can switch power per-port, and 6050458d5b4SAlan Stern * khubd reactivates the port later (timer, SRP, etc). 6060458d5b4SAlan Stern * Powerdown must be optional, because of reset/DFU. 6070458d5b4SAlan Stern */ 6080458d5b4SAlan Stern 6090458d5b4SAlan Stern set_bit(port1, hub->change_bits); 6100458d5b4SAlan Stern kick_khubd(hub); 6110458d5b4SAlan Stern } 6120458d5b4SAlan Stern 6130458d5b4SAlan Stern /* caller has locked the hub device */ 614f07600cfSAlan Stern static int hub_pre_reset(struct usb_interface *intf) 6150458d5b4SAlan Stern { 6160458d5b4SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 617b41a60ecSAlan Stern struct usb_device *hdev = hub->hdev; 618b41a60ecSAlan Stern int i; 6190458d5b4SAlan Stern 620b41a60ecSAlan Stern /* Disconnect all the children */ 621b41a60ecSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 622b41a60ecSAlan Stern if (hdev->children[i]) 623b41a60ecSAlan Stern usb_disconnect(&hdev->children[i]); 624b41a60ecSAlan Stern } 6257d069b7dSAlan Stern hub_quiesce(hub); 626f07600cfSAlan Stern return 0; 6277d069b7dSAlan Stern } 6287d069b7dSAlan Stern 6297d069b7dSAlan Stern /* caller has locked the hub device */ 630f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 6317d069b7dSAlan Stern { 6327de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 6337de18d8bSAlan Stern 6347d069b7dSAlan Stern hub_power_on(hub); 6350458d5b4SAlan Stern hub_activate(hub); 636f07600cfSAlan Stern return 0; 6377d069b7dSAlan Stern } 6387d069b7dSAlan Stern 6391da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 6401da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 6411da177e4SLinus Torvalds { 6421da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 6431da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 6441da177e4SLinus Torvalds u16 hubstatus, hubchange; 64574ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 6461da177e4SLinus Torvalds unsigned int pipe; 6471da177e4SLinus Torvalds int maxp, ret; 6481da177e4SLinus Torvalds char *message; 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL, 6511da177e4SLinus Torvalds &hub->buffer_dma); 6521da177e4SLinus Torvalds if (!hub->buffer) { 6531da177e4SLinus Torvalds message = "can't allocate hub irq buffer"; 6541da177e4SLinus Torvalds ret = -ENOMEM; 6551da177e4SLinus Torvalds goto fail; 6561da177e4SLinus Torvalds } 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 6591da177e4SLinus Torvalds if (!hub->status) { 6601da177e4SLinus Torvalds message = "can't kmalloc hub status buffer"; 6611da177e4SLinus Torvalds ret = -ENOMEM; 6621da177e4SLinus Torvalds goto fail; 6631da177e4SLinus Torvalds } 664db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 6651da177e4SLinus Torvalds 6661da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 6671da177e4SLinus Torvalds if (!hub->descriptor) { 6681da177e4SLinus Torvalds message = "can't kmalloc hub descriptor"; 6691da177e4SLinus Torvalds ret = -ENOMEM; 6701da177e4SLinus Torvalds goto fail; 6711da177e4SLinus Torvalds } 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvalds /* Request the entire hub descriptor. 6741da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 6751da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 6761da177e4SLinus Torvalds */ 6771da177e4SLinus Torvalds ret = get_hub_descriptor(hdev, hub->descriptor, 6781da177e4SLinus Torvalds sizeof(*hub->descriptor)); 6791da177e4SLinus Torvalds if (ret < 0) { 6801da177e4SLinus Torvalds message = "can't read hub descriptor"; 6811da177e4SLinus Torvalds goto fail; 6821da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 6831da177e4SLinus Torvalds message = "hub has too many ports!"; 6841da177e4SLinus Torvalds ret = -ENODEV; 6851da177e4SLinus Torvalds goto fail; 6861da177e4SLinus Torvalds } 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 6891da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 6901da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 6911da177e4SLinus Torvalds 69274ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 6931da177e4SLinus Torvalds 69474ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_COMPOUND) { 6951da177e4SLinus Torvalds int i; 6961da177e4SLinus Torvalds char portstr [USB_MAXCHILDREN + 1]; 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 6991da177e4SLinus Torvalds portstr[i] = hub->descriptor->DeviceRemovable 7001da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 7011da177e4SLinus Torvalds ? 'F' : 'R'; 7021da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 7031da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 7041da177e4SLinus Torvalds } else 7051da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 7061da177e4SLinus Torvalds 70774ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 7081da177e4SLinus Torvalds case 0x00: 7091da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 7101da177e4SLinus Torvalds break; 7111da177e4SLinus Torvalds case 0x01: 7121da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 7131da177e4SLinus Torvalds break; 7141da177e4SLinus Torvalds case 0x02: 7151da177e4SLinus Torvalds case 0x03: 7161da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 7171da177e4SLinus Torvalds break; 7181da177e4SLinus Torvalds } 7191da177e4SLinus Torvalds 72074ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 7211da177e4SLinus Torvalds case 0x00: 7221da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 7231da177e4SLinus Torvalds break; 7241da177e4SLinus Torvalds case 0x08: 7251da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 7261da177e4SLinus Torvalds break; 7271da177e4SLinus Torvalds case 0x10: 7281da177e4SLinus Torvalds case 0x18: 7291da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 7301da177e4SLinus Torvalds break; 7311da177e4SLinus Torvalds } 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 7341da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 735c4028958SDavid Howells INIT_WORK (&hub->tt.kevent, hub_tt_kevent); 7361da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 7371da177e4SLinus Torvalds case 0: 7381da177e4SLinus Torvalds break; 7391da177e4SLinus Torvalds case 1: 7401da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 7411da177e4SLinus Torvalds hub->tt.hub = hdev; 7421da177e4SLinus Torvalds break; 7431da177e4SLinus Torvalds case 2: 7441da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 7451da177e4SLinus Torvalds if (ret == 0) { 7461da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 7471da177e4SLinus Torvalds hub->tt.multi = 1; 7481da177e4SLinus Torvalds } else 7491da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 7501da177e4SLinus Torvalds ret); 7511da177e4SLinus Torvalds hub->tt.hub = hdev; 7521da177e4SLinus Torvalds break; 7531da177e4SLinus Torvalds default: 7541da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 7551da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 7561da177e4SLinus Torvalds break; 7571da177e4SLinus Torvalds } 7581da177e4SLinus Torvalds 759e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 76074ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 761e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 762e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 763e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 764e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 765e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 766e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 767e09711aeSdavid-b@pacbell.net } 7681da177e4SLinus Torvalds break; 769e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 770e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 771e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 772e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 773e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 7741da177e4SLinus Torvalds break; 775e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 776e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 777e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 778e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 779e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 7801da177e4SLinus Torvalds break; 781e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 782e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 783e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 784e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 785e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 7861da177e4SLinus Torvalds break; 7871da177e4SLinus Torvalds } 7881da177e4SLinus Torvalds 7891da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 79074ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 7911da177e4SLinus Torvalds hub->has_indicators = 1; 7921da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 7931da177e4SLinus Torvalds } 7941da177e4SLinus Torvalds 7951da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 7961da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 7971da177e4SLinus Torvalds 7981da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 7991da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 8001da177e4SLinus Torvalds */ 8011da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 80255c52718SAlan Stern if (ret < 2) { 8031da177e4SLinus Torvalds message = "can't get hub status"; 8041da177e4SLinus Torvalds goto fail; 8051da177e4SLinus Torvalds } 8067d35b929SAlan Stern le16_to_cpus(&hubstatus); 8077d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 80855c52718SAlan Stern if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) 80955c52718SAlan Stern hub->mA_per_port = 500; 81055c52718SAlan Stern else { 81155c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 81255c52718SAlan Stern hub->limited_power = 1; 81355c52718SAlan Stern } 8147d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 8151da177e4SLinus Torvalds dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 8161da177e4SLinus Torvalds hub->descriptor->bHubContrCurrent); 81755c52718SAlan Stern hub->limited_power = 1; 81855c52718SAlan Stern if (hdev->maxchild > 0) { 81955c52718SAlan Stern int remaining = hdev->bus_mA - 82055c52718SAlan Stern hub->descriptor->bHubContrCurrent; 8211da177e4SLinus Torvalds 82255c52718SAlan Stern if (remaining < hdev->maxchild * 100) 82355c52718SAlan Stern dev_warn(hub_dev, 82455c52718SAlan Stern "insufficient power available " 82555c52718SAlan Stern "to use all downstream ports\n"); 82655c52718SAlan Stern hub->mA_per_port = 100; /* 7.2.1.1 */ 82755c52718SAlan Stern } 82855c52718SAlan Stern } else { /* Self-powered external hub */ 82955c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 83055c52718SAlan Stern * provide less current per port? */ 83155c52718SAlan Stern hub->mA_per_port = 500; 83255c52718SAlan Stern } 83355c52718SAlan Stern if (hub->mA_per_port < 500) 83455c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 83555c52718SAlan Stern hub->mA_per_port); 8361da177e4SLinus Torvalds 8371da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 8381da177e4SLinus Torvalds if (ret < 0) { 8391da177e4SLinus Torvalds message = "can't get hub status"; 8401da177e4SLinus Torvalds goto fail; 8411da177e4SLinus Torvalds } 8421da177e4SLinus Torvalds 8431da177e4SLinus Torvalds /* local power status reports aren't always correct */ 8441da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 8451da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 8461da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 8471da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 8481da177e4SLinus Torvalds 84974ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 8501da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 8511da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 8521da177e4SLinus Torvalds 85388fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 85488fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 85588fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 85688fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 85788fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 85888fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 8591da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 8601da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 8611da177e4SLinus Torvalds 8621da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 8631da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 8641da177e4SLinus Torvalds 8651da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 8661da177e4SLinus Torvalds if (!hub->urb) { 8671da177e4SLinus Torvalds message = "couldn't allocate interrupt urb"; 8681da177e4SLinus Torvalds ret = -ENOMEM; 8691da177e4SLinus Torvalds goto fail; 8701da177e4SLinus Torvalds } 8711da177e4SLinus Torvalds 8721da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 8731da177e4SLinus Torvalds hub, endpoint->bInterval); 8741da177e4SLinus Torvalds hub->urb->transfer_dma = hub->buffer_dma; 8751da177e4SLinus Torvalds hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 8761da177e4SLinus Torvalds 8771da177e4SLinus Torvalds /* maybe cycle the hub leds */ 8781da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 8791da177e4SLinus Torvalds hub->indicator [0] = INDICATOR_CYCLE; 8801da177e4SLinus Torvalds 8811da177e4SLinus Torvalds hub_power_on(hub); 8821da177e4SLinus Torvalds hub_activate(hub); 8831da177e4SLinus Torvalds return 0; 8841da177e4SLinus Torvalds 8851da177e4SLinus Torvalds fail: 8861da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 8871da177e4SLinus Torvalds message, ret); 8881da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 8891da177e4SLinus Torvalds return ret; 8901da177e4SLinus Torvalds } 8911da177e4SLinus Torvalds 892e8054854SAlan Stern static void hub_release(struct kref *kref) 893e8054854SAlan Stern { 894e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 895e8054854SAlan Stern 896e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 897e8054854SAlan Stern kfree(hub); 898e8054854SAlan Stern } 899e8054854SAlan Stern 9001da177e4SLinus Torvalds static unsigned highspeed_hubs; 9011da177e4SLinus Torvalds 9021da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 9031da177e4SLinus Torvalds { 9041da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 905e8054854SAlan Stern 906e8054854SAlan Stern /* Take the hub off the event list and don't let it be added again */ 907e8054854SAlan Stern spin_lock_irq(&hub_event_lock); 908e8054854SAlan Stern list_del_init(&hub->event_list); 909e8054854SAlan Stern hub->disconnected = 1; 910e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 9111da177e4SLinus Torvalds 9127de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 9137de18d8bSAlan Stern hub->error = 0; 9147de18d8bSAlan Stern hub_pre_reset(intf); 9157de18d8bSAlan Stern 9168b28c752SAlan Stern usb_set_intfdata (intf, NULL); 9171da177e4SLinus Torvalds 918e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 9191da177e4SLinus Torvalds highspeed_hubs--; 9201da177e4SLinus Torvalds 9211da177e4SLinus Torvalds usb_free_urb(hub->urb); 9221da177e4SLinus Torvalds kfree(hub->descriptor); 9231da177e4SLinus Torvalds kfree(hub->status); 924e8054854SAlan Stern usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer, 9251da177e4SLinus Torvalds hub->buffer_dma); 9261da177e4SLinus Torvalds 927e8054854SAlan Stern kref_put(&hub->kref, hub_release); 9281da177e4SLinus Torvalds } 9291da177e4SLinus Torvalds 9301da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 9311da177e4SLinus Torvalds { 9321da177e4SLinus Torvalds struct usb_host_interface *desc; 9331da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 9341da177e4SLinus Torvalds struct usb_device *hdev; 9351da177e4SLinus Torvalds struct usb_hub *hub; 9361da177e4SLinus Torvalds 9371da177e4SLinus Torvalds desc = intf->cur_altsetting; 9381da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 9391da177e4SLinus Torvalds 94089ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 94189ccbdc9SDavid Brownell if (hdev->parent) { 94289ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 94389ccbdc9SDavid Brownell return -ENODEV; 94489ccbdc9SDavid Brownell } 94589ccbdc9SDavid Brownell #endif 94689ccbdc9SDavid Brownell 9471da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 9481da177e4SLinus Torvalds /* specs is not defined, but it works */ 9491da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 9501da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 9511da177e4SLinus Torvalds descriptor_error: 9521da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 9531da177e4SLinus Torvalds return -EIO; 9541da177e4SLinus Torvalds } 9551da177e4SLinus Torvalds 9561da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 9571da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 9581da177e4SLinus Torvalds goto descriptor_error; 9591da177e4SLinus Torvalds 9601da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 9611da177e4SLinus Torvalds 962fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 963fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 9641da177e4SLinus Torvalds goto descriptor_error; 9651da177e4SLinus Torvalds 9661da177e4SLinus Torvalds /* We found a hub */ 9671da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 9681da177e4SLinus Torvalds 9690a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 9701da177e4SLinus Torvalds if (!hub) { 9711da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 9721da177e4SLinus Torvalds return -ENOMEM; 9731da177e4SLinus Torvalds } 9741da177e4SLinus Torvalds 975e8054854SAlan Stern kref_init(&hub->kref); 9761da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 9771da177e4SLinus Torvalds hub->intfdev = &intf->dev; 9781da177e4SLinus Torvalds hub->hdev = hdev; 979c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 980e8054854SAlan Stern usb_get_intf(intf); 9811da177e4SLinus Torvalds 9821da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 98340f122f3SAlan Stern intf->needs_remote_wakeup = 1; 9841da177e4SLinus Torvalds 9851da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 9861da177e4SLinus Torvalds highspeed_hubs++; 9871da177e4SLinus Torvalds 9881da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 9891da177e4SLinus Torvalds return 0; 9901da177e4SLinus Torvalds 9911da177e4SLinus Torvalds hub_disconnect (intf); 9921da177e4SLinus Torvalds return -ENODEV; 9931da177e4SLinus Torvalds } 9941da177e4SLinus Torvalds 9951da177e4SLinus Torvalds static int 9961da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 9971da177e4SLinus Torvalds { 9981da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 9991da177e4SLinus Torvalds 10001da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 10011da177e4SLinus Torvalds switch (code) { 10021da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 10031da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 10041da177e4SLinus Torvalds int i; 10051da177e4SLinus Torvalds 10061da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 10071da177e4SLinus Torvalds if (hdev->devnum <= 0) 10081da177e4SLinus Torvalds info->nports = 0; 10091da177e4SLinus Torvalds else { 10101da177e4SLinus Torvalds info->nports = hdev->maxchild; 10111da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 10121da177e4SLinus Torvalds if (hdev->children[i] == NULL) 10131da177e4SLinus Torvalds info->port[i] = 0; 10141da177e4SLinus Torvalds else 10151da177e4SLinus Torvalds info->port[i] = 10161da177e4SLinus Torvalds hdev->children[i]->devnum; 10171da177e4SLinus Torvalds } 10181da177e4SLinus Torvalds } 10191da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 10201da177e4SLinus Torvalds 10211da177e4SLinus Torvalds return info->nports + 1; 10221da177e4SLinus Torvalds } 10231da177e4SLinus Torvalds 10241da177e4SLinus Torvalds default: 10251da177e4SLinus Torvalds return -ENOSYS; 10261da177e4SLinus Torvalds } 10271da177e4SLinus Torvalds } 10281da177e4SLinus Torvalds 10291da177e4SLinus Torvalds 10301da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 10311da177e4SLinus Torvalds { 10321da177e4SLinus Torvalds int i; 10331da177e4SLinus Torvalds 10341da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 10351da177e4SLinus Torvalds if (udev->children[i]) 10361da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev->children[i]); 10371da177e4SLinus Torvalds } 103815123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED) { 1039ee49fb5dSAlan Stern udev->discon_suspended = 1; 104015123006SSarah Sharp udev->active_duration -= jiffies; 104115123006SSarah Sharp } 10421da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 10431da177e4SLinus Torvalds } 10441da177e4SLinus Torvalds 10451da177e4SLinus Torvalds /** 10461da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 10471da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 10481da177e4SLinus Torvalds * @new_state: new state value to be stored 10491da177e4SLinus Torvalds * 10501da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 10511da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 10521da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 10531da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 10541da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 10551da177e4SLinus Torvalds * all changes to any device's state must be protected by the 10561da177e4SLinus Torvalds * device_state_lock spinlock. 10571da177e4SLinus Torvalds * 10581da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 10591da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 10601da177e4SLinus Torvalds * 10611da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 10621da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 10631da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 10641da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 10651da177e4SLinus Torvalds */ 10661da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 10671da177e4SLinus Torvalds enum usb_device_state new_state) 10681da177e4SLinus Torvalds { 10691da177e4SLinus Torvalds unsigned long flags; 10701da177e4SLinus Torvalds 10711da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 10721da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 10731da177e4SLinus Torvalds ; /* do nothing */ 1074b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1075fb669cc0SDavid Brownell 1076fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1077fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1078fb669cc0SDavid Brownell */ 1079fb669cc0SDavid Brownell if (udev->parent) { 1080645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1081645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1082645daaabSAlan Stern ; /* No change to wakeup settings */ 1083645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 1084b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 1085b94dc6b5SDavid Brownell (udev->actconfig->desc.bmAttributes 1086b94dc6b5SDavid Brownell & USB_CONFIG_ATT_WAKEUP)); 1087645daaabSAlan Stern else 1088b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 0); 1089fb669cc0SDavid Brownell } 109015123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED && 109115123006SSarah Sharp new_state != USB_STATE_SUSPENDED) 109215123006SSarah Sharp udev->active_duration -= jiffies; 109315123006SSarah Sharp else if (new_state == USB_STATE_SUSPENDED && 109415123006SSarah Sharp udev->state != USB_STATE_SUSPENDED) 109515123006SSarah Sharp udev->active_duration += jiffies; 1096645daaabSAlan Stern udev->state = new_state; 1097b94dc6b5SDavid Brownell } else 10981da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 10991da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 11001da177e4SLinus Torvalds } 11011da177e4SLinus Torvalds 11021da177e4SLinus Torvalds static void choose_address(struct usb_device *udev) 11031da177e4SLinus Torvalds { 11041da177e4SLinus Torvalds int devnum; 11051da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 11061da177e4SLinus Torvalds 11071da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 11081da177e4SLinus Torvalds 11091da177e4SLinus Torvalds /* Try to allocate the next devnum beginning at bus->devnum_next. */ 11101da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 11111da177e4SLinus Torvalds bus->devnum_next); 11121da177e4SLinus Torvalds if (devnum >= 128) 11131da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1); 11141da177e4SLinus Torvalds 11151da177e4SLinus Torvalds bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); 11161da177e4SLinus Torvalds 11171da177e4SLinus Torvalds if (devnum < 128) { 11181da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 11191da177e4SLinus Torvalds udev->devnum = devnum; 11201da177e4SLinus Torvalds } 11211da177e4SLinus Torvalds } 11221da177e4SLinus Torvalds 11231da177e4SLinus Torvalds static void release_address(struct usb_device *udev) 11241da177e4SLinus Torvalds { 11251da177e4SLinus Torvalds if (udev->devnum > 0) { 11261da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 11271da177e4SLinus Torvalds udev->devnum = -1; 11281da177e4SLinus Torvalds } 11291da177e4SLinus Torvalds } 11301da177e4SLinus Torvalds 1131d5d4db70SAlan Stern #ifdef CONFIG_USB_SUSPEND 1132d5d4db70SAlan Stern 1133d5d4db70SAlan Stern static void usb_stop_pm(struct usb_device *udev) 1134d5d4db70SAlan Stern { 1135d5d4db70SAlan Stern /* Synchronize with the ksuspend thread to prevent any more 1136d5d4db70SAlan Stern * autosuspend requests from being submitted, and decrement 1137d5d4db70SAlan Stern * the parent's count of unsuspended children. 1138d5d4db70SAlan Stern */ 1139d5d4db70SAlan Stern usb_pm_lock(udev); 1140d5d4db70SAlan Stern if (udev->parent && !udev->discon_suspended) 1141d5d4db70SAlan Stern usb_autosuspend_device(udev->parent); 1142d5d4db70SAlan Stern usb_pm_unlock(udev); 1143d5d4db70SAlan Stern 1144d5d4db70SAlan Stern /* Stop any autosuspend requests already submitted */ 1145d5d4db70SAlan Stern cancel_rearming_delayed_work(&udev->autosuspend); 1146d5d4db70SAlan Stern } 1147d5d4db70SAlan Stern 1148d5d4db70SAlan Stern #else 1149d5d4db70SAlan Stern 1150d5d4db70SAlan Stern static inline void usb_stop_pm(struct usb_device *udev) 1151d5d4db70SAlan Stern { } 1152d5d4db70SAlan Stern 1153d5d4db70SAlan Stern #endif 1154d5d4db70SAlan Stern 11551da177e4SLinus Torvalds /** 11561da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 11571da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 11581da177e4SLinus Torvalds * Context: !in_interrupt () 11591da177e4SLinus Torvalds * 11601da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 11611da177e4SLinus Torvalds * 11621da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 11631da177e4SLinus Torvalds * If *pdev is a root hub then this routine will acquire the 11641da177e4SLinus Torvalds * usb_bus_list_lock on behalf of the caller. 11651da177e4SLinus Torvalds * 11661da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 11671da177e4SLinus Torvalds * controllers) should ever call this. 11681da177e4SLinus Torvalds * 11691da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 11701da177e4SLinus Torvalds */ 11711da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 11721da177e4SLinus Torvalds { 11731da177e4SLinus Torvalds struct usb_device *udev = *pdev; 11741da177e4SLinus Torvalds int i; 11751da177e4SLinus Torvalds 11761da177e4SLinus Torvalds if (!udev) { 11771da177e4SLinus Torvalds pr_debug ("%s nodev\n", __FUNCTION__); 11781da177e4SLinus Torvalds return; 11791da177e4SLinus Torvalds } 11801da177e4SLinus Torvalds 11811da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 11821da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 11831da177e4SLinus Torvalds * this quiesces everyting except pending urbs. 11841da177e4SLinus Torvalds */ 11851da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 11861da177e4SLinus Torvalds dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); 11871da177e4SLinus Torvalds 11889ad3d6ccSAlan Stern usb_lock_device(udev); 11899ad3d6ccSAlan Stern 11901da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 11911da177e4SLinus Torvalds for (i = 0; i < USB_MAXCHILDREN; i++) { 11921da177e4SLinus Torvalds if (udev->children[i]) 11931da177e4SLinus Torvalds usb_disconnect(&udev->children[i]); 11941da177e4SLinus Torvalds } 11951da177e4SLinus Torvalds 11961da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 11971da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 11981da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 11991da177e4SLinus Torvalds */ 1200782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 12011da177e4SLinus Torvalds usb_disable_device(udev, 0); 12021da177e4SLinus Torvalds 1203782da727SAlan Stern usb_unlock_device(udev); 12043099e75aSGreg Kroah-Hartman 1205782da727SAlan Stern /* Unregister the device. The device driver is responsible 1206782da727SAlan Stern * for removing the device files from usbfs and sysfs and for 1207782da727SAlan Stern * de-configuring the device. 1208782da727SAlan Stern */ 1209782da727SAlan Stern device_del(&udev->dev); 1210782da727SAlan Stern 1211782da727SAlan Stern /* Free the device number and delete the parent's children[] 12121da177e4SLinus Torvalds * (or root_hub) pointer. 12131da177e4SLinus Torvalds */ 12141da177e4SLinus Torvalds release_address(udev); 12151da177e4SLinus Torvalds 12161da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 12171da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 12181da177e4SLinus Torvalds *pdev = NULL; 12191da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 12201da177e4SLinus Torvalds 1221d5d4db70SAlan Stern usb_stop_pm(udev); 1222ee49fb5dSAlan Stern 1223782da727SAlan Stern put_device(&udev->dev); 12241da177e4SLinus Torvalds } 12251da177e4SLinus Torvalds 1226f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 12271da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 12281da177e4SLinus Torvalds { 12291da177e4SLinus Torvalds if (!string) 12301da177e4SLinus Torvalds return; 12311da177e4SLinus Torvalds dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); 12321da177e4SLinus Torvalds } 12331da177e4SLinus Torvalds 1234f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 1235f2a383e4SGreg Kroah-Hartman { 1236f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", 1237f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 1238f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idProduct)); 1239f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device strings: Mfr=%d, Product=%d, " 1240f2a383e4SGreg Kroah-Hartman "SerialNumber=%d\n", 1241f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 1242f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 1243f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 1244f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 1245f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 1246f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 1247f2a383e4SGreg Kroah-Hartman } 12481da177e4SLinus Torvalds #else 1249f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 12501da177e4SLinus Torvalds #endif 12511da177e4SLinus Torvalds 12521da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 12531da177e4SLinus Torvalds #include "otg_whitelist.h" 12541da177e4SLinus Torvalds #endif 12551da177e4SLinus Torvalds 12563ede760fSOliver Neukum /** 1257d9d16e8aSInaky Perez-Gonzalez * usb_configure_device_otg - FIXME (usbcore-internal) 12583ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 12593ede760fSOliver Neukum * 1260d9d16e8aSInaky Perez-Gonzalez * Do configuration for On-The-Go devices 12613ede760fSOliver Neukum */ 1262d9d16e8aSInaky Perez-Gonzalez static int usb_configure_device_otg(struct usb_device *udev) 12631da177e4SLinus Torvalds { 1264d9d16e8aSInaky Perez-Gonzalez int err = 0; 12651da177e4SLinus Torvalds 12661da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 12671da177e4SLinus Torvalds /* 12681da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 12691da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 12701da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 12711da177e4SLinus Torvalds */ 12721da177e4SLinus Torvalds if (!udev->bus->is_b_host 12731da177e4SLinus Torvalds && udev->config 12741da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 12751da177e4SLinus Torvalds struct usb_otg_descriptor *desc = 0; 12761da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 12771da177e4SLinus Torvalds 12781da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 12791da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 12801da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 12811da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 12821da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 128312c3da34SAlan Stern unsigned port1 = udev->portnum; 12841da177e4SLinus Torvalds 12851da177e4SLinus Torvalds dev_info(&udev->dev, 12861da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 12871da177e4SLinus Torvalds (port1 == bus->otg_port) 12881da177e4SLinus Torvalds ? "" : "non-"); 12891da177e4SLinus Torvalds 12901da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 12911da177e4SLinus Torvalds if (port1 == bus->otg_port) 12921da177e4SLinus Torvalds bus->b_hnp_enable = 1; 12931da177e4SLinus Torvalds err = usb_control_msg(udev, 12941da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 12951da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 12961da177e4SLinus Torvalds bus->b_hnp_enable 12971da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 12981da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 12991da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 13001da177e4SLinus Torvalds if (err < 0) { 13011da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 13021da177e4SLinus Torvalds * customize to match your product. 13031da177e4SLinus Torvalds */ 13041da177e4SLinus Torvalds dev_info(&udev->dev, 13051da177e4SLinus Torvalds "can't set HNP mode; %d\n", 13061da177e4SLinus Torvalds err); 13071da177e4SLinus Torvalds bus->b_hnp_enable = 0; 13081da177e4SLinus Torvalds } 13091da177e4SLinus Torvalds } 13101da177e4SLinus Torvalds } 13111da177e4SLinus Torvalds } 13121da177e4SLinus Torvalds 13131da177e4SLinus Torvalds if (!is_targeted(udev)) { 13141da177e4SLinus Torvalds 13151da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 13161da177e4SLinus Torvalds * (Includes HNP test device.) 13171da177e4SLinus Torvalds */ 13181da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 13194956eccdSAlan Stern err = usb_port_suspend(udev); 13201da177e4SLinus Torvalds if (err < 0) 13211da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 13221da177e4SLinus Torvalds } 1323ffcdc18dSVikram Pandita err = -ENOTSUPP; 13241da177e4SLinus Torvalds goto fail; 13251da177e4SLinus Torvalds } 1326d9d16e8aSInaky Perez-Gonzalez fail: 13271da177e4SLinus Torvalds #endif 1328d9d16e8aSInaky Perez-Gonzalez return err; 1329d9d16e8aSInaky Perez-Gonzalez } 13301da177e4SLinus Torvalds 1331d9d16e8aSInaky Perez-Gonzalez 1332d9d16e8aSInaky Perez-Gonzalez /** 1333d9d16e8aSInaky Perez-Gonzalez * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal) 1334d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 1335d9d16e8aSInaky Perez-Gonzalez * 1336d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 1337d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 1338d9d16e8aSInaky Perez-Gonzalez * environment. 1339d9d16e8aSInaky Perez-Gonzalez * 1340d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 1341d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 1342d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 1343d9d16e8aSInaky Perez-Gonzalez */ 1344d9d16e8aSInaky Perez-Gonzalez static int usb_configure_device(struct usb_device *udev) 1345d9d16e8aSInaky Perez-Gonzalez { 1346d9d16e8aSInaky Perez-Gonzalez int err; 1347d9d16e8aSInaky Perez-Gonzalez 1348d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 1349d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 1350d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 1351d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 1352d9d16e8aSInaky Perez-Gonzalez err); 1353d9d16e8aSInaky Perez-Gonzalez goto fail; 1354d9d16e8aSInaky Perez-Gonzalez } 1355d9d16e8aSInaky Perez-Gonzalez } 1356d9d16e8aSInaky Perez-Gonzalez if (udev->wusb == 1 && udev->authorized == 0) { 1357d9d16e8aSInaky Perez-Gonzalez udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1358d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1359d9d16e8aSInaky Perez-Gonzalez udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1360d9d16e8aSInaky Perez-Gonzalez } 1361d9d16e8aSInaky Perez-Gonzalez else { 1362d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 1363d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 1364d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 1365d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 1366d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 1367d9d16e8aSInaky Perez-Gonzalez } 1368d9d16e8aSInaky Perez-Gonzalez err = usb_configure_device_otg(udev); 1369d9d16e8aSInaky Perez-Gonzalez fail: 1370d9d16e8aSInaky Perez-Gonzalez return err; 1371d9d16e8aSInaky Perez-Gonzalez } 1372d9d16e8aSInaky Perez-Gonzalez 1373d9d16e8aSInaky Perez-Gonzalez 1374d9d16e8aSInaky Perez-Gonzalez /** 1375d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 1376d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 1377d9d16e8aSInaky Perez-Gonzalez * 1378d9d16e8aSInaky Perez-Gonzalez * This is called with devices which have been enumerated, but not yet 1379d9d16e8aSInaky Perez-Gonzalez * configured. The device descriptor is available, but not descriptors 1380d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 1381d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 1382d9d16e8aSInaky Perez-Gonzalez * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 1383d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 1384d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 1385d9d16e8aSInaky Perez-Gonzalez * 1386d9d16e8aSInaky Perez-Gonzalez * It will return if the device is configured properly or not. Zero if 1387d9d16e8aSInaky Perez-Gonzalez * the interface was registered with the driver core; else a negative 1388d9d16e8aSInaky Perez-Gonzalez * errno value. 1389d9d16e8aSInaky Perez-Gonzalez * 1390d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 1391d9d16e8aSInaky Perez-Gonzalez * 1392d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 1393d9d16e8aSInaky Perez-Gonzalez */ 1394d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 1395d9d16e8aSInaky Perez-Gonzalez { 1396d9d16e8aSInaky Perez-Gonzalez int err; 1397d9d16e8aSInaky Perez-Gonzalez 1398d9d16e8aSInaky Perez-Gonzalez usb_detect_quirks(udev); /* Determine quirks */ 1399d9d16e8aSInaky Perez-Gonzalez err = usb_configure_device(udev); /* detect & probe dev/intfs */ 1400d9d16e8aSInaky Perez-Gonzalez if (err < 0) 1401d9d16e8aSInaky Perez-Gonzalez goto fail; 14029f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 14039f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 14049f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 14059f8b17e6SKay Sievers 1406195af2ccSAlan Stern /* Increment the parent's count of unsuspended children */ 1407195af2ccSAlan Stern if (udev->parent) 1408195af2ccSAlan Stern usb_autoresume_device(udev->parent); 1409195af2ccSAlan Stern 1410782da727SAlan Stern /* Register the device. The device driver is responsible 14119f8b17e6SKay Sievers * for adding the device files to sysfs and for configuring 14129f8b17e6SKay Sievers * the device. 1413782da727SAlan Stern */ 14141da177e4SLinus Torvalds err = device_add(&udev->dev); 14151da177e4SLinus Torvalds if (err) { 14161da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 14171da177e4SLinus Torvalds goto fail; 14181da177e4SLinus Torvalds } 14199ad3d6ccSAlan Stern 1420d9d16e8aSInaky Perez-Gonzalez /* Tell the world! */ 1421f2a383e4SGreg Kroah-Hartman announce_device(udev); 1422c066475eSGreg Kroah-Hartman return err; 14231da177e4SLinus Torvalds 14241da177e4SLinus Torvalds fail: 14251da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 1426d9d16e8aSInaky Perez-Gonzalez return err; 14271da177e4SLinus Torvalds } 14281da177e4SLinus Torvalds 142993993a0aSInaky Perez-Gonzalez 143093993a0aSInaky Perez-Gonzalez /** 1431fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 1432fd39c86bSRandy Dunlap * @usb_dev: USB device 1433fd39c86bSRandy Dunlap * 1434fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 1435fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 143693993a0aSInaky Perez-Gonzalez * 143793993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 143893993a0aSInaky Perez-Gonzalez * defer its call. 143993993a0aSInaky Perez-Gonzalez */ 144093993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 144193993a0aSInaky Perez-Gonzalez { 144293993a0aSInaky Perez-Gonzalez unsigned cnt; 144393993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 144493993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 144593993a0aSInaky Perez-Gonzalez goto out_unauthorized; 144693993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 144793993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 144893993a0aSInaky Perez-Gonzalez usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 144993993a0aSInaky Perez-Gonzalez usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 145093993a0aSInaky Perez-Gonzalez usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 145193993a0aSInaky Perez-Gonzalez kfree(usb_dev->config); 145293993a0aSInaky Perez-Gonzalez usb_dev->config = NULL; 145393993a0aSInaky Perez-Gonzalez for (cnt = 0; cnt < usb_dev->descriptor.bNumConfigurations; cnt++) 145493993a0aSInaky Perez-Gonzalez kfree(usb_dev->rawdescriptors[cnt]); 145593993a0aSInaky Perez-Gonzalez usb_dev->descriptor.bNumConfigurations = 0; 145693993a0aSInaky Perez-Gonzalez kfree(usb_dev->rawdescriptors); 145793993a0aSInaky Perez-Gonzalez out_unauthorized: 145893993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 145993993a0aSInaky Perez-Gonzalez return 0; 146093993a0aSInaky Perez-Gonzalez } 146193993a0aSInaky Perez-Gonzalez 146293993a0aSInaky Perez-Gonzalez 146393993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 146493993a0aSInaky Perez-Gonzalez { 146593993a0aSInaky Perez-Gonzalez int result = 0, c; 146693993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 146793993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 146893993a0aSInaky Perez-Gonzalez goto out_authorized; 146993993a0aSInaky Perez-Gonzalez kfree(usb_dev->product); 147093993a0aSInaky Perez-Gonzalez usb_dev->product = NULL; 147193993a0aSInaky Perez-Gonzalez kfree(usb_dev->manufacturer); 147293993a0aSInaky Perez-Gonzalez usb_dev->manufacturer = NULL; 147393993a0aSInaky Perez-Gonzalez kfree(usb_dev->serial); 147493993a0aSInaky Perez-Gonzalez usb_dev->serial = NULL; 147593993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 147693993a0aSInaky Perez-Gonzalez if (result < 0) { 147793993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 147893993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 147993993a0aSInaky Perez-Gonzalez goto error_autoresume; 148093993a0aSInaky Perez-Gonzalez } 148193993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 148293993a0aSInaky Perez-Gonzalez if (result < 0) { 148393993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 148493993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 148593993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 148693993a0aSInaky Perez-Gonzalez } 148793993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 148893993a0aSInaky Perez-Gonzalez result = usb_configure_device(usb_dev); 148993993a0aSInaky Perez-Gonzalez if (result < 0) 149093993a0aSInaky Perez-Gonzalez goto error_configure; 149193993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 149293993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 149393993a0aSInaky Perez-Gonzalez */ 1494b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 149593993a0aSInaky Perez-Gonzalez if (c >= 0) { 149693993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 149793993a0aSInaky Perez-Gonzalez if (result) { 149893993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 149993993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 150093993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 150193993a0aSInaky Perez-Gonzalez * set other configurations. */ 150293993a0aSInaky Perez-Gonzalez } 150393993a0aSInaky Perez-Gonzalez } 150493993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 150593993a0aSInaky Perez-Gonzalez error_configure: 150693993a0aSInaky Perez-Gonzalez error_device_descriptor: 150793993a0aSInaky Perez-Gonzalez error_autoresume: 150893993a0aSInaky Perez-Gonzalez out_authorized: 150993993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); // complements locktree 151093993a0aSInaky Perez-Gonzalez return result; 151193993a0aSInaky Perez-Gonzalez } 151293993a0aSInaky Perez-Gonzalez 151393993a0aSInaky Perez-Gonzalez 15141da177e4SLinus Torvalds static int hub_port_status(struct usb_hub *hub, int port1, 15151da177e4SLinus Torvalds u16 *status, u16 *change) 15161da177e4SLinus Torvalds { 15171da177e4SLinus Torvalds int ret; 15181da177e4SLinus Torvalds 1519db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 15201da177e4SLinus Torvalds ret = get_port_status(hub->hdev, port1, &hub->status->port); 1521d25450c6SAlan Stern if (ret < 4) { 15221da177e4SLinus Torvalds dev_err (hub->intfdev, 15231da177e4SLinus Torvalds "%s failed (err = %d)\n", __FUNCTION__, ret); 1524d25450c6SAlan Stern if (ret >= 0) 1525d25450c6SAlan Stern ret = -EIO; 1526d25450c6SAlan Stern } else { 15271da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->port.wPortStatus); 15281da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->port.wPortChange); 15291da177e4SLinus Torvalds ret = 0; 15301da177e4SLinus Torvalds } 1531db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 15321da177e4SLinus Torvalds return ret; 15331da177e4SLinus Torvalds } 15341da177e4SLinus Torvalds 15350165de09SInaky Perez-Gonzalez 15360165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 15370165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 15380165de09SInaky Perez-Gonzalez { 15390165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 15400165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 15410165de09SInaky Perez-Gonzalez return 0; 15420165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 15430165de09SInaky Perez-Gonzalez return hcd->wireless; 15440165de09SInaky Perez-Gonzalez } 15450165de09SInaky Perez-Gonzalez 15460165de09SInaky Perez-Gonzalez 15471da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 15481da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 15491da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 15501da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 15511da177e4SLinus Torvalds #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) 15521da177e4SLinus Torvalds 15531da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 15541da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 15551da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 15561da177e4SLinus Torvalds #define HUB_RESET_TIMEOUT 500 15571da177e4SLinus Torvalds 15581da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 15591da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 15601da177e4SLinus Torvalds { 15611da177e4SLinus Torvalds int delay_time, ret; 15621da177e4SLinus Torvalds u16 portstatus; 15631da177e4SLinus Torvalds u16 portchange; 15641da177e4SLinus Torvalds 15651da177e4SLinus Torvalds for (delay_time = 0; 15661da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 15671da177e4SLinus Torvalds delay_time += delay) { 15681da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 15691da177e4SLinus Torvalds msleep(delay); 15701da177e4SLinus Torvalds 15711da177e4SLinus Torvalds /* read and decode port status */ 15721da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 15731da177e4SLinus Torvalds if (ret < 0) 15741da177e4SLinus Torvalds return ret; 15751da177e4SLinus Torvalds 15761da177e4SLinus Torvalds /* Device went away? */ 15771da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 15781da177e4SLinus Torvalds return -ENOTCONN; 15791da177e4SLinus Torvalds 1580dd4dd19eSAlan Stern /* bomb out completely if the connection bounced */ 15811da177e4SLinus Torvalds if ((portchange & USB_PORT_STAT_C_CONNECTION)) 1582dd4dd19eSAlan Stern return -ENOTCONN; 15831da177e4SLinus Torvalds 15841da177e4SLinus Torvalds /* if we`ve finished resetting, then break out of the loop */ 15851da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_RESET) && 15861da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_ENABLE)) { 15870165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 15880165de09SInaky Perez-Gonzalez udev->speed = USB_SPEED_VARIABLE; 15890165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 15901da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 15911da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 15921da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 15931da177e4SLinus Torvalds else 15941da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 15951da177e4SLinus Torvalds return 0; 15961da177e4SLinus Torvalds } 15971da177e4SLinus Torvalds 15981da177e4SLinus Torvalds /* switch to the long delay after two short delay failures */ 15991da177e4SLinus Torvalds if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 16001da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 16011da177e4SLinus Torvalds 16021da177e4SLinus Torvalds dev_dbg (hub->intfdev, 16031da177e4SLinus Torvalds "port %d not reset yet, waiting %dms\n", 16041da177e4SLinus Torvalds port1, delay); 16051da177e4SLinus Torvalds } 16061da177e4SLinus Torvalds 16071da177e4SLinus Torvalds return -EBUSY; 16081da177e4SLinus Torvalds } 16091da177e4SLinus Torvalds 16101da177e4SLinus Torvalds static int hub_port_reset(struct usb_hub *hub, int port1, 16111da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 16121da177e4SLinus Torvalds { 16131da177e4SLinus Torvalds int i, status; 16141da177e4SLinus Torvalds 161532fe0198SAlan Stern /* Block EHCI CF initialization during the port reset. 161632fe0198SAlan Stern * Some companion controllers don't like it when they mix. 161732fe0198SAlan Stern */ 161832fe0198SAlan Stern down_read(&ehci_cf_port_reset_rwsem); 161932fe0198SAlan Stern 16201da177e4SLinus Torvalds /* Reset the port */ 16211da177e4SLinus Torvalds for (i = 0; i < PORT_RESET_TRIES; i++) { 16221da177e4SLinus Torvalds status = set_port_feature(hub->hdev, 16231da177e4SLinus Torvalds port1, USB_PORT_FEAT_RESET); 16241da177e4SLinus Torvalds if (status) 16251da177e4SLinus Torvalds dev_err(hub->intfdev, 16261da177e4SLinus Torvalds "cannot reset port %d (err = %d)\n", 16271da177e4SLinus Torvalds port1, status); 16281da177e4SLinus Torvalds else { 16291da177e4SLinus Torvalds status = hub_port_wait_reset(hub, port1, udev, delay); 1630dd16525bSDavid Brownell if (status && status != -ENOTCONN) 16311da177e4SLinus Torvalds dev_dbg(hub->intfdev, 16321da177e4SLinus Torvalds "port_wait_reset: err = %d\n", 16331da177e4SLinus Torvalds status); 16341da177e4SLinus Torvalds } 16351da177e4SLinus Torvalds 16361da177e4SLinus Torvalds /* return on disconnect or reset */ 16371da177e4SLinus Torvalds switch (status) { 16381da177e4SLinus Torvalds case 0: 1639b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 1640b789696aSDavid Brownell msleep(10 + 40); 16414326ed0bSAlan Stern udev->devnum = 0; /* Device now at address 0 */ 16421da177e4SLinus Torvalds /* FALL THROUGH */ 16431da177e4SLinus Torvalds case -ENOTCONN: 16441da177e4SLinus Torvalds case -ENODEV: 16451da177e4SLinus Torvalds clear_port_feature(hub->hdev, 16461da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 16471da177e4SLinus Torvalds /* FIXME need disconnect() for NOTATTACHED device */ 16481da177e4SLinus Torvalds usb_set_device_state(udev, status 16491da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 16501da177e4SLinus Torvalds : USB_STATE_DEFAULT); 165132fe0198SAlan Stern goto done; 16521da177e4SLinus Torvalds } 16531da177e4SLinus Torvalds 16541da177e4SLinus Torvalds dev_dbg (hub->intfdev, 16551da177e4SLinus Torvalds "port %d not enabled, trying reset again...\n", 16561da177e4SLinus Torvalds port1); 16571da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 16581da177e4SLinus Torvalds } 16591da177e4SLinus Torvalds 16601da177e4SLinus Torvalds dev_err (hub->intfdev, 16611da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 16621da177e4SLinus Torvalds port1); 16631da177e4SLinus Torvalds 166432fe0198SAlan Stern done: 166532fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 16661da177e4SLinus Torvalds return status; 16671da177e4SLinus Torvalds } 16681da177e4SLinus Torvalds 1669d388dab7SAlan Stern #ifdef CONFIG_PM 16701da177e4SLinus Torvalds 16711da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 16721da177e4SLinus Torvalds 16731da177e4SLinus Torvalds /* 1674140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 1675624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 16765edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 16771da177e4SLinus Torvalds * 16781da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 16791da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 16801da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 1681140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 16821da177e4SLinus Torvalds * to disconnect devices while they are suspended. 16831da177e4SLinus Torvalds * 1684390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 1685390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 1686390a8c34SDavid Brownell * 1687624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 1688624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 1689624d6c07SAlan Stern * All devices below the suspended port are also suspended. 1690624d6c07SAlan Stern * 1691624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 1692624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 1693624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 1694624d6c07SAlan Stern * some cases, this wakes the USB host. 1695624d6c07SAlan Stern * 16961da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 16971da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 16981da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 16991da177e4SLinus Torvalds * 17004956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 17014956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 17024956eccdSAlan Stern * State transitions include: 17034956eccdSAlan Stern * 17044956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 17054956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 17064956eccdSAlan Stern * 17074956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 17084956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 17094956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 17104956eccdSAlan Stern * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 17114956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 17124956eccdSAlan Stern * 17134956eccdSAlan Stern * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when 17144956eccdSAlan Stern * the root hub for their bus goes into global suspend ... so we don't 17154956eccdSAlan Stern * (falsely) update the device power state to say it suspended. 17164956eccdSAlan Stern * 17171da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 17181da177e4SLinus Torvalds */ 1719140d8f68SAlan Stern int usb_port_suspend(struct usb_device *udev) 17201da177e4SLinus Torvalds { 1721624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 1722624d6c07SAlan Stern int port1 = udev->portnum; 1723624d6c07SAlan Stern int status; 17244956eccdSAlan Stern 1725624d6c07SAlan Stern // dev_dbg(hub->intfdev, "suspend port %d\n", port1); 1726624d6c07SAlan Stern 1727624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 1728624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 1729624d6c07SAlan Stern * 1730624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 1731624d6c07SAlan Stern * we don't explicitly enable it here. 1732624d6c07SAlan Stern */ 1733624d6c07SAlan Stern if (udev->do_remote_wakeup) { 1734624d6c07SAlan Stern status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 1735624d6c07SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 1736624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 1737624d6c07SAlan Stern NULL, 0, 1738624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 1739624d6c07SAlan Stern if (status) 1740624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 1741624d6c07SAlan Stern status); 1742624d6c07SAlan Stern } 1743624d6c07SAlan Stern 1744624d6c07SAlan Stern /* see 7.1.7.6 */ 1745624d6c07SAlan Stern status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); 1746624d6c07SAlan Stern if (status) { 1747624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", 1748624d6c07SAlan Stern port1, status); 1749624d6c07SAlan Stern /* paranoia: "should not happen" */ 1750624d6c07SAlan Stern (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 1751624d6c07SAlan Stern USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 1752624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 1753624d6c07SAlan Stern NULL, 0, 1754624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 1755624d6c07SAlan Stern } else { 1756624d6c07SAlan Stern /* device has up to 10 msec to fully suspend */ 1757624d6c07SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend\n", 1758624d6c07SAlan Stern udev->auto_pm ? "auto-" : ""); 1759624d6c07SAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 1760624d6c07SAlan Stern msleep(10); 1761624d6c07SAlan Stern } 17624956eccdSAlan Stern return status; 17631da177e4SLinus Torvalds } 1764f3f3253dSDavid Brownell 17651da177e4SLinus Torvalds /* 1766390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 1767390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 176854515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 17691da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 17701da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 17711da177e4SLinus Torvalds * in the tree that's rooted at this device. 177254515fe5SAlan Stern * 177354515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 177454515fe5SAlan Stern * status check is done. 17751da177e4SLinus Torvalds */ 1776140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 17771da177e4SLinus Torvalds { 177854515fe5SAlan Stern int status = 0; 17791da177e4SLinus Torvalds u16 devstatus; 17801da177e4SLinus Torvalds 17811da177e4SLinus Torvalds /* caller owns the udev device lock */ 178254515fe5SAlan Stern dev_dbg(&udev->dev, "finish %sresume\n", 178354515fe5SAlan Stern udev->reset_resume ? "reset-" : ""); 17841da177e4SLinus Torvalds 17851da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 17861da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 17871da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 17881da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 17891da177e4SLinus Torvalds */ 17901da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 17911da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 17921da177e4SLinus Torvalds : USB_STATE_ADDRESS); 17931da177e4SLinus Torvalds 179454515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 179554515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 179654515fe5SAlan Stern * operation is carried out here, after the port has been 179754515fe5SAlan Stern * resumed. 179854515fe5SAlan Stern */ 179954515fe5SAlan Stern if (udev->reset_resume) 180054515fe5SAlan Stern status = usb_reset_device(udev); 180154515fe5SAlan Stern 18021da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 18031da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 18041da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 18051da177e4SLinus Torvalds */ 180654515fe5SAlan Stern if (status == 0) { 180746dede46SAlan Stern devstatus = 0; 18081da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 1809b40b7a90SAlan Stern if (status >= 0) 181046dede46SAlan Stern status = (status > 0 ? 0 : -ENODEV); 181154515fe5SAlan Stern } 1812b40b7a90SAlan Stern 1813624d6c07SAlan Stern if (status) { 1814624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 18151da177e4SLinus Torvalds status); 1816624d6c07SAlan Stern } else if (udev->actconfig) { 18171da177e4SLinus Torvalds le16_to_cpus(&devstatus); 1818686314cfSAlan Stern if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { 18191da177e4SLinus Torvalds status = usb_control_msg(udev, 18201da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 18211da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, 18221da177e4SLinus Torvalds USB_RECIP_DEVICE, 18231da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 18241da177e4SLinus Torvalds NULL, 0, 18251da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 1826a8e7c565SAlan Stern if (status) 18271da177e4SLinus Torvalds dev_dbg(&udev->dev, "disable remote " 18281da177e4SLinus Torvalds "wakeup, status %d\n", status); 18294bf0ba86SAlan Stern } 18301da177e4SLinus Torvalds status = 0; 18311da177e4SLinus Torvalds } 18321da177e4SLinus Torvalds return status; 18331da177e4SLinus Torvalds } 18341da177e4SLinus Torvalds 1835624d6c07SAlan Stern /* 1836624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 1837624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 1838624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 1839624d6c07SAlan Stern * 1840624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 1841624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 1842624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 1843624d6c07SAlan Stern * the host and the device is the same as it was when the device 1844624d6c07SAlan Stern * suspended. 1845624d6c07SAlan Stern * 184654515fe5SAlan Stern * If CONFIG_USB_PERSIST and @udev->reset_resume are both set then this 184754515fe5SAlan Stern * routine won't check that the port is still enabled. Furthermore, 184854515fe5SAlan Stern * if @udev->reset_resume is set then finish_port_resume() above will 184954515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 185054515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 185154515fe5SAlan Stern * 185254515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 185354515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 185454515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 185554515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 185654515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 185754515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 185854515fe5SAlan Stern * made to appear as if it had not disconnected. 185954515fe5SAlan Stern * 186054515fe5SAlan Stern * This facility is inherently dangerous. Although usb_reset_device() 186154515fe5SAlan Stern * makes every effort to insure that the same device is present after the 186254515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 186354515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 186454515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 186554515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 186654515fe5SAlan Stern * new card is corrupted and the system crashes. 186754515fe5SAlan Stern * 1868624d6c07SAlan Stern * Returns 0 on success, else negative errno. 1869624d6c07SAlan Stern */ 1870624d6c07SAlan Stern int usb_port_resume(struct usb_device *udev) 18711da177e4SLinus Torvalds { 1872624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 1873624d6c07SAlan Stern int port1 = udev->portnum; 18741da177e4SLinus Torvalds int status; 1875d25450c6SAlan Stern u16 portchange, portstatus; 187654515fe5SAlan Stern unsigned mask_flags, want_flags; 1877d25450c6SAlan Stern 1878d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 1879d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 1880d25450c6SAlan Stern if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND)) 1881d25450c6SAlan Stern goto SuspendCleared; 18821da177e4SLinus Torvalds 18831da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "resume port %d\n", port1); 18841da177e4SLinus Torvalds 1885d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 1886d5cbad4bSAlan Stern 18871da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 18881da177e4SLinus Torvalds status = clear_port_feature(hub->hdev, 18891da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 18901da177e4SLinus Torvalds if (status) { 1891624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", 18921da177e4SLinus Torvalds port1, status); 18931da177e4SLinus Torvalds } else { 18941da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 1895645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 1896645daaabSAlan Stern udev->auto_pm ? "auto-" : ""); 18971da177e4SLinus Torvalds msleep(25); 18981da177e4SLinus Torvalds 18991da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 19001da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 19011da177e4SLinus Torvalds * sequence. 19021da177e4SLinus Torvalds */ 1903d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 190454515fe5SAlan Stern 1905d25450c6SAlan Stern SuspendCleared: 190654515fe5SAlan Stern if (USB_PERSIST && udev->reset_resume) 190754515fe5SAlan Stern want_flags = USB_PORT_STAT_POWER 190854515fe5SAlan Stern | USB_PORT_STAT_CONNECTION; 190954515fe5SAlan Stern else 191054515fe5SAlan Stern want_flags = USB_PORT_STAT_POWER 191154515fe5SAlan Stern | USB_PORT_STAT_CONNECTION 191254515fe5SAlan Stern | USB_PORT_STAT_ENABLE; 191354515fe5SAlan Stern mask_flags = want_flags | USB_PORT_STAT_SUSPEND; 191454515fe5SAlan Stern 191554515fe5SAlan Stern if (status < 0 || (portstatus & mask_flags) != want_flags) { 19161da177e4SLinus Torvalds dev_dbg(hub->intfdev, 19171da177e4SLinus Torvalds "port %d status %04x.%04x after resume, %d\n", 1918d25450c6SAlan Stern port1, portchange, portstatus, status); 191920307949SAlan Stern if (status >= 0) 192020307949SAlan Stern status = -ENODEV; 19211da177e4SLinus Torvalds } else { 192220307949SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 192320307949SAlan Stern clear_port_feature(hub->hdev, port1, 192420307949SAlan Stern USB_PORT_FEAT_C_SUSPEND); 19251da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 19261da177e4SLinus Torvalds msleep(10); 19271da177e4SLinus Torvalds } 19281da177e4SLinus Torvalds } 19291da177e4SLinus Torvalds 1930d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 1931d5cbad4bSAlan Stern if (!hub->hdev->parent && !hub->busy_bits[0]) 1932d5cbad4bSAlan Stern usb_enable_root_hub_irq(hub->hdev->bus); 1933d5cbad4bSAlan Stern 193454515fe5SAlan Stern if (status == 0) 193554515fe5SAlan Stern status = finish_port_resume(udev); 193654515fe5SAlan Stern if (status < 0) { 193754515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 193854515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 193954515fe5SAlan Stern } 19401da177e4SLinus Torvalds return status; 19411da177e4SLinus Torvalds } 19421da177e4SLinus Torvalds 19431da177e4SLinus Torvalds static int remote_wakeup(struct usb_device *udev) 19441da177e4SLinus Torvalds { 19451da177e4SLinus Torvalds int status = 0; 19461da177e4SLinus Torvalds 19479ad3d6ccSAlan Stern usb_lock_device(udev); 19481da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 1949645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 19501941044aSAlan Stern usb_mark_last_busy(udev); 19516b157c9bSAlan Stern status = usb_external_resume_device(udev); 1952d25450c6SAlan Stern } 19539ad3d6ccSAlan Stern usb_unlock_device(udev); 19541da177e4SLinus Torvalds return status; 19551da177e4SLinus Torvalds } 19561da177e4SLinus Torvalds 1957d388dab7SAlan Stern #else /* CONFIG_USB_SUSPEND */ 1958d388dab7SAlan Stern 1959d388dab7SAlan Stern /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ 1960d388dab7SAlan Stern 1961d388dab7SAlan Stern int usb_port_suspend(struct usb_device *udev) 1962d388dab7SAlan Stern { 1963d388dab7SAlan Stern return 0; 1964d388dab7SAlan Stern } 1965d388dab7SAlan Stern 1966d388dab7SAlan Stern int usb_port_resume(struct usb_device *udev) 1967d388dab7SAlan Stern { 196854515fe5SAlan Stern int status = 0; 196954515fe5SAlan Stern 197054515fe5SAlan Stern /* However we may need to do a reset-resume */ 197154515fe5SAlan Stern if (udev->reset_resume) { 197254515fe5SAlan Stern dev_dbg(&udev->dev, "reset-resume\n"); 197354515fe5SAlan Stern status = usb_reset_device(udev); 197454515fe5SAlan Stern } 197554515fe5SAlan Stern return status; 1976d388dab7SAlan Stern } 1977d388dab7SAlan Stern 1978d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 1979d388dab7SAlan Stern { 1980d388dab7SAlan Stern return 0; 1981d388dab7SAlan Stern } 1982d388dab7SAlan Stern 1983d388dab7SAlan Stern #endif 1984d388dab7SAlan Stern 1985db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 19861da177e4SLinus Torvalds { 19871da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 19881da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 19891da177e4SLinus Torvalds unsigned port1; 19901da177e4SLinus Torvalds 1991c9f89fa4SDavid Brownell /* fail if children aren't already suspended */ 19921da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 19931da177e4SLinus Torvalds struct usb_device *udev; 19941da177e4SLinus Torvalds 19951da177e4SLinus Torvalds udev = hdev->children [port1-1]; 19966840d255SAlan Stern if (udev && udev->can_submit) { 1997645daaabSAlan Stern if (!hdev->auto_pm) 1998645daaabSAlan Stern dev_dbg(&intf->dev, "port %d nyet suspended\n", 1999645daaabSAlan Stern port1); 2000c9f89fa4SDavid Brownell return -EBUSY; 2001c9f89fa4SDavid Brownell } 20021da177e4SLinus Torvalds } 20031da177e4SLinus Torvalds 200440f122f3SAlan Stern dev_dbg(&intf->dev, "%s\n", __FUNCTION__); 200540f122f3SAlan Stern 2006c9f89fa4SDavid Brownell /* stop khubd and related activity */ 2007c9f89fa4SDavid Brownell hub_quiesce(hub); 2008b6f6436dSAlan Stern return 0; 20091da177e4SLinus Torvalds } 20101da177e4SLinus Torvalds 20111da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 20121da177e4SLinus Torvalds { 20131da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 20141da177e4SLinus Torvalds 201540f122f3SAlan Stern dev_dbg(&intf->dev, "%s\n", __FUNCTION__); 201640f122f3SAlan Stern 2017a8e7c565SAlan Stern /* tell khubd to look for changes on this hub */ 2018f3f3253dSDavid Brownell hub_activate(hub); 20191da177e4SLinus Torvalds return 0; 20201da177e4SLinus Torvalds } 20211da177e4SLinus Torvalds 2022b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 2023f07600cfSAlan Stern { 2024b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 2025f07600cfSAlan Stern struct usb_device *hdev = hub->hdev; 2026f07600cfSAlan Stern int port1; 2027f07600cfSAlan Stern 2028b41a60ecSAlan Stern hub_power_on(hub); 2029b41a60ecSAlan Stern 2030f07600cfSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 2031f07600cfSAlan Stern struct usb_device *child = hdev->children[port1-1]; 2032f07600cfSAlan Stern 2033f07600cfSAlan Stern if (child) { 2034b41a60ecSAlan Stern 2035b41a60ecSAlan Stern /* For "USB_PERSIST"-enabled children we must 2036b41a60ecSAlan Stern * mark the child device for reset-resume and 2037b41a60ecSAlan Stern * turn off the connect-change status to prevent 2038b41a60ecSAlan Stern * khubd from disconnecting it later. 2039b41a60ecSAlan Stern */ 2040b41a60ecSAlan Stern if (USB_PERSIST && child->persist_enabled) { 2041f07600cfSAlan Stern child->reset_resume = 1; 2042f07600cfSAlan Stern clear_port_feature(hdev, port1, 2043f07600cfSAlan Stern USB_PORT_FEAT_C_CONNECTION); 2044f07600cfSAlan Stern 2045b41a60ecSAlan Stern /* Otherwise we must disconnect the child, 2046b41a60ecSAlan Stern * but as we may not lock the child device here 2047b41a60ecSAlan Stern * we have to do a "logical" disconnect. 2048f07600cfSAlan Stern */ 2049b41a60ecSAlan Stern } else { 2050b41a60ecSAlan Stern hub_port_logical_disconnect(hub, port1); 2051f07600cfSAlan Stern } 2052b41a60ecSAlan Stern } 2053b41a60ecSAlan Stern } 2054b41a60ecSAlan Stern 2055f07600cfSAlan Stern hub_activate(hub); 2056f07600cfSAlan Stern return 0; 2057f07600cfSAlan Stern } 2058f07600cfSAlan Stern 205954515fe5SAlan Stern /** 206054515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 206154515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 206254515fe5SAlan Stern * 206354515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 206454515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 206554515fe5SAlan Stern * has been reset. The routine marks @rhdev as having lost power. When 206654515fe5SAlan Stern * the hub driver is resumed it will take notice; if CONFIG_USB_PERSIST 206754515fe5SAlan Stern * is enabled then it will carry out power-session recovery, otherwise 206854515fe5SAlan Stern * it will disconnect all the child devices. 206954515fe5SAlan Stern */ 207054515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 207154515fe5SAlan Stern { 207254515fe5SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 207354515fe5SAlan Stern rhdev->reset_resume = 1; 207454515fe5SAlan Stern } 207554515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 207654515fe5SAlan Stern 2077d388dab7SAlan Stern #else /* CONFIG_PM */ 2078d388dab7SAlan Stern 2079d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 2080d388dab7SAlan Stern { 2081d388dab7SAlan Stern return 0; 2082d388dab7SAlan Stern } 2083d388dab7SAlan Stern 2084511366daSAndrew Morton #define hub_suspend NULL 2085511366daSAndrew Morton #define hub_resume NULL 2086f07600cfSAlan Stern #define hub_reset_resume NULL 2087d388dab7SAlan Stern #endif 2088d388dab7SAlan Stern 20891da177e4SLinus Torvalds 20901da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 20911da177e4SLinus Torvalds * 20921da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 20931da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 20941da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 20951da177e4SLinus Torvalds * 20961da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 20971da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 20981da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 20991da177e4SLinus Torvalds * 21001da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 21011da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 21021da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 21031da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 21041da177e4SLinus Torvalds */ 21051da177e4SLinus Torvalds 21061da177e4SLinus Torvalds #define HUB_DEBOUNCE_TIMEOUT 1500 21071da177e4SLinus Torvalds #define HUB_DEBOUNCE_STEP 25 21081da177e4SLinus Torvalds #define HUB_DEBOUNCE_STABLE 100 21091da177e4SLinus Torvalds 21101da177e4SLinus Torvalds static int hub_port_debounce(struct usb_hub *hub, int port1) 21111da177e4SLinus Torvalds { 21121da177e4SLinus Torvalds int ret; 21131da177e4SLinus Torvalds int total_time, stable_time = 0; 21141da177e4SLinus Torvalds u16 portchange, portstatus; 21151da177e4SLinus Torvalds unsigned connection = 0xffff; 21161da177e4SLinus Torvalds 21171da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 21181da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 21191da177e4SLinus Torvalds if (ret < 0) 21201da177e4SLinus Torvalds return ret; 21211da177e4SLinus Torvalds 21221da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 21231da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 21241da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 21251da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 21261da177e4SLinus Torvalds break; 21271da177e4SLinus Torvalds } else { 21281da177e4SLinus Torvalds stable_time = 0; 21291da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 21301da177e4SLinus Torvalds } 21311da177e4SLinus Torvalds 21321da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 21331da177e4SLinus Torvalds clear_port_feature(hub->hdev, port1, 21341da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 21351da177e4SLinus Torvalds } 21361da177e4SLinus Torvalds 21371da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 21381da177e4SLinus Torvalds break; 21391da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 21401da177e4SLinus Torvalds } 21411da177e4SLinus Torvalds 21421da177e4SLinus Torvalds dev_dbg (hub->intfdev, 21431da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 21441da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 21451da177e4SLinus Torvalds 21461da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 21471da177e4SLinus Torvalds return -ETIMEDOUT; 21481da177e4SLinus Torvalds return portstatus; 21491da177e4SLinus Torvalds } 21501da177e4SLinus Torvalds 21511da177e4SLinus Torvalds static void ep0_reinit(struct usb_device *udev) 21521da177e4SLinus Torvalds { 21531da177e4SLinus Torvalds usb_disable_endpoint(udev, 0 + USB_DIR_IN); 21541da177e4SLinus Torvalds usb_disable_endpoint(udev, 0 + USB_DIR_OUT); 2155bdd016baSAlan Stern usb_enable_endpoint(udev, &udev->ep0); 21561da177e4SLinus Torvalds } 21571da177e4SLinus Torvalds 21581da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 21591da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 21601da177e4SLinus Torvalds 21614326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 21621da177e4SLinus Torvalds { 21631da177e4SLinus Torvalds int retval; 21641da177e4SLinus Torvalds 21654326ed0bSAlan Stern if (devnum <= 1) 21661da177e4SLinus Torvalds return -EINVAL; 21671da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 21681da177e4SLinus Torvalds return 0; 21691da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 21701da177e4SLinus Torvalds return -EINVAL; 21711da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 21724326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 21731da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 21741da177e4SLinus Torvalds if (retval == 0) { 21754326ed0bSAlan Stern udev->devnum = devnum; /* Device now using proper address */ 21761da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 21771da177e4SLinus Torvalds ep0_reinit(udev); 21781da177e4SLinus Torvalds } 21791da177e4SLinus Torvalds return retval; 21801da177e4SLinus Torvalds } 21811da177e4SLinus Torvalds 21821da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 21831da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 21841da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 21851da177e4SLinus Torvalds * 21861da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 21871da177e4SLinus Torvalds * usb_reset_device), the caller must own the device lock. For a 21881da177e4SLinus Torvalds * newly detected device that is not accessible through any global 21891da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 21901da177e4SLinus Torvalds */ 21911da177e4SLinus Torvalds static int 21921da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 21931da177e4SLinus Torvalds int retry_counter) 21941da177e4SLinus Torvalds { 21954186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 21961da177e4SLinus Torvalds 21971da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 21981da177e4SLinus Torvalds int i, j, retval; 21991da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 22001da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 220183a07196SInaky Perez-Gonzalez char *speed, *type; 22024326ed0bSAlan Stern int devnum = udev->devnum; 22031da177e4SLinus Torvalds 22041da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 22051da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 22061da177e4SLinus Torvalds */ 22071da177e4SLinus Torvalds if (!hdev->parent) { 22081da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 22091da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 22101da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 22111da177e4SLinus Torvalds } 22121da177e4SLinus Torvalds 22131da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 22141da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 22151da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 22161da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 22171da177e4SLinus Torvalds 22184186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 22191da177e4SLinus Torvalds 22201da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 22211da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 22221da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 22231da177e4SLinus Torvalds goto fail; 22241da177e4SLinus Torvalds /* success, speed is known */ 22251da177e4SLinus Torvalds retval = -ENODEV; 22261da177e4SLinus Torvalds 22271da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 22281da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 22291da177e4SLinus Torvalds goto fail; 22301da177e4SLinus Torvalds } 22311da177e4SLinus Torvalds oldspeed = udev->speed; 22321da177e4SLinus Torvalds 22331da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 22341da177e4SLinus Torvalds * it's fixed size except for full speed devices. 22355bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 22365bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 22371da177e4SLinus Torvalds */ 22381da177e4SLinus Torvalds switch (udev->speed) { 22395bb6e0aeSInaky Perez-Gonzalez case USB_SPEED_VARIABLE: /* fixed at 512 */ 22405bb6e0aeSInaky Perez-Gonzalez udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512); 22415bb6e0aeSInaky Perez-Gonzalez break; 22421da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 22431da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); 22441da177e4SLinus Torvalds break; 22451da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 22461da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 22471da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 22481da177e4SLinus Torvalds * then correct our initial guess. 22491da177e4SLinus Torvalds */ 22501da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); 22511da177e4SLinus Torvalds break; 22521da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 22531da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8); 22541da177e4SLinus Torvalds break; 22551da177e4SLinus Torvalds default: 22561da177e4SLinus Torvalds goto fail; 22571da177e4SLinus Torvalds } 22581da177e4SLinus Torvalds 225983a07196SInaky Perez-Gonzalez type = ""; 226083a07196SInaky Perez-Gonzalez switch (udev->speed) { 22611da177e4SLinus Torvalds case USB_SPEED_LOW: speed = "low"; break; 22621da177e4SLinus Torvalds case USB_SPEED_FULL: speed = "full"; break; 22631da177e4SLinus Torvalds case USB_SPEED_HIGH: speed = "high"; break; 226483a07196SInaky Perez-Gonzalez case USB_SPEED_VARIABLE: 226583a07196SInaky Perez-Gonzalez speed = "variable"; 226683a07196SInaky Perez-Gonzalez type = "Wireless "; 226783a07196SInaky Perez-Gonzalez break; 22681da177e4SLinus Torvalds default: speed = "?"; break; 226983a07196SInaky Perez-Gonzalez } 227083a07196SInaky Perez-Gonzalez dev_info (&udev->dev, 227183a07196SInaky Perez-Gonzalez "%s %s speed %sUSB device using %s and address %d\n", 227283a07196SInaky Perez-Gonzalez (udev->config) ? "reset" : "new", speed, type, 22734326ed0bSAlan Stern udev->bus->controller->driver->name, devnum); 22741da177e4SLinus Torvalds 22751da177e4SLinus Torvalds /* Set up TT records, if needed */ 22761da177e4SLinus Torvalds if (hdev->tt) { 22771da177e4SLinus Torvalds udev->tt = hdev->tt; 22781da177e4SLinus Torvalds udev->ttport = hdev->ttport; 22791da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 22801da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 22811da177e4SLinus Torvalds udev->tt = &hub->tt; 22821da177e4SLinus Torvalds udev->ttport = port1; 22831da177e4SLinus Torvalds } 22841da177e4SLinus Torvalds 22851da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 22861da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 22871da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 22881da177e4SLinus Torvalds * Change it cautiously. 22891da177e4SLinus Torvalds * 22901da177e4SLinus Torvalds * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 22911da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 22921da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 22931da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 22941da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 22951da177e4SLinus Torvalds * value. 22961da177e4SLinus Torvalds */ 22971da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 22981da177e4SLinus Torvalds if (USE_NEW_SCHEME(retry_counter)) { 22991da177e4SLinus Torvalds struct usb_device_descriptor *buf; 23001da177e4SLinus Torvalds int r = 0; 23011da177e4SLinus Torvalds 23021da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 23031da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 23041da177e4SLinus Torvalds if (!buf) { 23051da177e4SLinus Torvalds retval = -ENOMEM; 23061da177e4SLinus Torvalds continue; 23071da177e4SLinus Torvalds } 23081da177e4SLinus Torvalds 2309b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 2310b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 2311b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 23121da177e4SLinus Torvalds */ 23131da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 23141da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 23151da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 23161da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 23171da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 23181da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 2319b89ee19aSAlan Stern USB_CTRL_GET_TIMEOUT); 23201da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 23215bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 23221da177e4SLinus Torvalds if (buf->bDescriptorType == 23231da177e4SLinus Torvalds USB_DT_DEVICE) { 23241da177e4SLinus Torvalds r = 0; 23251da177e4SLinus Torvalds break; 23261da177e4SLinus Torvalds } 23271da177e4SLinus Torvalds /* FALL THROUGH */ 23281da177e4SLinus Torvalds default: 23291da177e4SLinus Torvalds if (r == 0) 23301da177e4SLinus Torvalds r = -EPROTO; 23311da177e4SLinus Torvalds break; 23321da177e4SLinus Torvalds } 23331da177e4SLinus Torvalds if (r == 0) 23341da177e4SLinus Torvalds break; 23351da177e4SLinus Torvalds } 23361da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 23371da177e4SLinus Torvalds buf->bMaxPacketSize0; 23381da177e4SLinus Torvalds kfree(buf); 23391da177e4SLinus Torvalds 23401da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 23411da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 23421da177e4SLinus Torvalds goto fail; 23431da177e4SLinus Torvalds if (oldspeed != udev->speed) { 23441da177e4SLinus Torvalds dev_dbg(&udev->dev, 23451da177e4SLinus Torvalds "device reset changed speed!\n"); 23461da177e4SLinus Torvalds retval = -ENODEV; 23471da177e4SLinus Torvalds goto fail; 23481da177e4SLinus Torvalds } 23491da177e4SLinus Torvalds if (r) { 23501da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor " 23511da177e4SLinus Torvalds "read/%s, error %d\n", 23521da177e4SLinus Torvalds "64", r); 23531da177e4SLinus Torvalds retval = -EMSGSIZE; 23541da177e4SLinus Torvalds continue; 23551da177e4SLinus Torvalds } 23561da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 23571da177e4SLinus Torvalds } 23581da177e4SLinus Torvalds 23591da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 23604326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 23611da177e4SLinus Torvalds if (retval >= 0) 23621da177e4SLinus Torvalds break; 23631da177e4SLinus Torvalds msleep(200); 23641da177e4SLinus Torvalds } 23651da177e4SLinus Torvalds if (retval < 0) { 23661da177e4SLinus Torvalds dev_err(&udev->dev, 23671da177e4SLinus Torvalds "device not accepting address %d, error %d\n", 23684326ed0bSAlan Stern devnum, retval); 23691da177e4SLinus Torvalds goto fail; 23701da177e4SLinus Torvalds } 23711da177e4SLinus Torvalds 23721da177e4SLinus Torvalds /* cope with hardware quirkiness: 23731da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 23741da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 23751da177e4SLinus Torvalds */ 23761da177e4SLinus Torvalds msleep(10); 23771da177e4SLinus Torvalds if (USE_NEW_SCHEME(retry_counter)) 23781da177e4SLinus Torvalds break; 23791da177e4SLinus Torvalds 23801da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 23811da177e4SLinus Torvalds if (retval < 8) { 23821da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor " 23831da177e4SLinus Torvalds "read/%s, error %d\n", 23841da177e4SLinus Torvalds "8", retval); 23851da177e4SLinus Torvalds if (retval >= 0) 23861da177e4SLinus Torvalds retval = -EMSGSIZE; 23871da177e4SLinus Torvalds } else { 23881da177e4SLinus Torvalds retval = 0; 23891da177e4SLinus Torvalds break; 23901da177e4SLinus Torvalds } 23911da177e4SLinus Torvalds } 23921da177e4SLinus Torvalds if (retval) 23931da177e4SLinus Torvalds goto fail; 23941da177e4SLinus Torvalds 23955bb6e0aeSInaky Perez-Gonzalez i = udev->descriptor.bMaxPacketSize0 == 0xff? 23965bb6e0aeSInaky Perez-Gonzalez 512 : udev->descriptor.bMaxPacketSize0; 23971da177e4SLinus Torvalds if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { 23981da177e4SLinus Torvalds if (udev->speed != USB_SPEED_FULL || 23991da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 24001da177e4SLinus Torvalds dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); 24011da177e4SLinus Torvalds retval = -EMSGSIZE; 24021da177e4SLinus Torvalds goto fail; 24031da177e4SLinus Torvalds } 24041da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 24051da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 24061da177e4SLinus Torvalds ep0_reinit(udev); 24071da177e4SLinus Torvalds } 24081da177e4SLinus Torvalds 24091da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 24101da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 24111da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor read/%s, error %d\n", 24121da177e4SLinus Torvalds "all", retval); 24131da177e4SLinus Torvalds if (retval >= 0) 24141da177e4SLinus Torvalds retval = -ENOMSG; 24151da177e4SLinus Torvalds goto fail; 24161da177e4SLinus Torvalds } 24171da177e4SLinus Torvalds 24181da177e4SLinus Torvalds retval = 0; 24191da177e4SLinus Torvalds 24201da177e4SLinus Torvalds fail: 24214326ed0bSAlan Stern if (retval) { 24221da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 24234326ed0bSAlan Stern udev->devnum = devnum; /* for disconnect processing */ 24244326ed0bSAlan Stern } 24254186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 24261da177e4SLinus Torvalds return retval; 24271da177e4SLinus Torvalds } 24281da177e4SLinus Torvalds 24291da177e4SLinus Torvalds static void 24301da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 24311da177e4SLinus Torvalds { 24321da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 24331da177e4SLinus Torvalds int status; 24341da177e4SLinus Torvalds 2435e94b1766SChristoph Lameter qual = kmalloc (sizeof *qual, GFP_KERNEL); 24361da177e4SLinus Torvalds if (qual == NULL) 24371da177e4SLinus Torvalds return; 24381da177e4SLinus Torvalds 24391da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 24401da177e4SLinus Torvalds qual, sizeof *qual); 24411da177e4SLinus Torvalds if (status == sizeof *qual) { 24421da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 24431da177e4SLinus Torvalds "connect to a high speed hub\n"); 24441da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 24451da177e4SLinus Torvalds if (hub->has_indicators) { 24461da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 2447c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 24481da177e4SLinus Torvalds } 24491da177e4SLinus Torvalds } 24501da177e4SLinus Torvalds kfree(qual); 24511da177e4SLinus Torvalds } 24521da177e4SLinus Torvalds 24531da177e4SLinus Torvalds static unsigned 24541da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 24551da177e4SLinus Torvalds { 24561da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 24571da177e4SLinus Torvalds int remaining; 245855c52718SAlan Stern int port1; 24591da177e4SLinus Torvalds 246055c52718SAlan Stern if (!hub->limited_power) 24611da177e4SLinus Torvalds return 0; 24621da177e4SLinus Torvalds 246355c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 246455c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 246555c52718SAlan Stern struct usb_device *udev = hdev->children[port1 - 1]; 246655c52718SAlan Stern int delta; 24671da177e4SLinus Torvalds 24681da177e4SLinus Torvalds if (!udev) 24691da177e4SLinus Torvalds continue; 24701da177e4SLinus Torvalds 247155c52718SAlan Stern /* Unconfigured devices may not use more than 100mA, 247255c52718SAlan Stern * or 8mA for OTG ports */ 24731da177e4SLinus Torvalds if (udev->actconfig) 247455c52718SAlan Stern delta = udev->actconfig->desc.bMaxPower * 2; 247555c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 247655c52718SAlan Stern delta = 100; 24771da177e4SLinus Torvalds else 247855c52718SAlan Stern delta = 8; 247955c52718SAlan Stern if (delta > hub->mA_per_port) 248055c52718SAlan Stern dev_warn(&udev->dev, "%dmA is over %umA budget " 248155c52718SAlan Stern "for port %d!\n", 248255c52718SAlan Stern delta, hub->mA_per_port, port1); 24831da177e4SLinus Torvalds remaining -= delta; 24841da177e4SLinus Torvalds } 24851da177e4SLinus Torvalds if (remaining < 0) { 248655c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 248755c52718SAlan Stern - remaining); 24881da177e4SLinus Torvalds remaining = 0; 24891da177e4SLinus Torvalds } 24901da177e4SLinus Torvalds return remaining; 24911da177e4SLinus Torvalds } 24921da177e4SLinus Torvalds 24931da177e4SLinus Torvalds /* Handle physical or logical connection change events. 24941da177e4SLinus Torvalds * This routine is called when: 24951da177e4SLinus Torvalds * a port connection-change occurs; 24961da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 24971da177e4SLinus Torvalds * usb_reset_device() encounters changed descriptors (as from 24981da177e4SLinus Torvalds * a firmware download) 24991da177e4SLinus Torvalds * caller already locked the hub 25001da177e4SLinus Torvalds */ 25011da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 25021da177e4SLinus Torvalds u16 portstatus, u16 portchange) 25031da177e4SLinus Torvalds { 25041da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 25051da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 250690da096eSBalaji Rao struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 250774ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 25081da177e4SLinus Torvalds int status, i; 25091da177e4SLinus Torvalds 25101da177e4SLinus Torvalds dev_dbg (hub_dev, 25111da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 25121da177e4SLinus Torvalds port1, portstatus, portchange, portspeed (portstatus)); 25131da177e4SLinus Torvalds 25141da177e4SLinus Torvalds if (hub->has_indicators) { 25151da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 25161da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 25171da177e4SLinus Torvalds } 25181da177e4SLinus Torvalds 25191da177e4SLinus Torvalds /* Disconnect any existing devices under this port */ 25201da177e4SLinus Torvalds if (hdev->children[port1-1]) 25211da177e4SLinus Torvalds usb_disconnect(&hdev->children[port1-1]); 25221da177e4SLinus Torvalds clear_bit(port1, hub->change_bits); 25231da177e4SLinus Torvalds 25241da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 25251da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 25261da177e4SLinus Torvalds if (hdev->bus->is_b_host) 25271da177e4SLinus Torvalds portchange &= ~USB_PORT_STAT_C_CONNECTION; 25281da177e4SLinus Torvalds #endif 25291da177e4SLinus Torvalds 25301da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 25311da177e4SLinus Torvalds status = hub_port_debounce(hub, port1); 2532d4b7d8e8SAlan Stern if (status < 0) { 2533d4b7d8e8SAlan Stern if (printk_ratelimit()) 2534d4b7d8e8SAlan Stern dev_err (hub_dev, "connect-debounce failed, " 2535d4b7d8e8SAlan Stern "port %d disabled\n", port1); 25361da177e4SLinus Torvalds goto done; 25371da177e4SLinus Torvalds } 25381da177e4SLinus Torvalds portstatus = status; 25391da177e4SLinus Torvalds } 25401da177e4SLinus Torvalds 25411da177e4SLinus Torvalds /* Return now if nothing is connected */ 25421da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) { 25431da177e4SLinus Torvalds 25441da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 254574ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 25461da177e4SLinus Torvalds && !(portstatus & (1 << USB_PORT_FEAT_POWER))) 25471da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 25481da177e4SLinus Torvalds 25491da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 25501da177e4SLinus Torvalds goto done; 25511da177e4SLinus Torvalds return; 25521da177e4SLinus Torvalds } 25531da177e4SLinus Torvalds 25541da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 25551da177e4SLinus Torvalds struct usb_device *udev; 25561da177e4SLinus Torvalds 25571da177e4SLinus Torvalds /* reallocate for each attempt, since references 25581da177e4SLinus Torvalds * to the previous one can escape in various ways 25591da177e4SLinus Torvalds */ 25601da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 25611da177e4SLinus Torvalds if (!udev) { 25621da177e4SLinus Torvalds dev_err (hub_dev, 25631da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 25641da177e4SLinus Torvalds port1); 25651da177e4SLinus Torvalds goto done; 25661da177e4SLinus Torvalds } 25671da177e4SLinus Torvalds 25681da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 25691da177e4SLinus Torvalds udev->speed = USB_SPEED_UNKNOWN; 257055c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 2571b6956ffaSAlan Stern udev->level = hdev->level + 1; 25721da177e4SLinus Torvalds 25731da177e4SLinus Torvalds /* set the address */ 25741da177e4SLinus Torvalds choose_address(udev); 25751da177e4SLinus Torvalds if (udev->devnum <= 0) { 25761da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 25771da177e4SLinus Torvalds goto loop; 25781da177e4SLinus Torvalds } 25791da177e4SLinus Torvalds 25801da177e4SLinus Torvalds /* reset and get descriptor */ 25811da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 25821da177e4SLinus Torvalds if (status < 0) 25831da177e4SLinus Torvalds goto loop; 25841da177e4SLinus Torvalds 25851da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 25861da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 25871da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 25881da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 25891da177e4SLinus Torvalds * on the parent. 25901da177e4SLinus Torvalds */ 25911da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 259255c52718SAlan Stern && udev->bus_mA <= 100) { 25931da177e4SLinus Torvalds u16 devstat; 25941da177e4SLinus Torvalds 25951da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 25961da177e4SLinus Torvalds &devstat); 259755c52718SAlan Stern if (status < 2) { 25981da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 25991da177e4SLinus Torvalds goto loop_disable; 26001da177e4SLinus Torvalds } 260155c52718SAlan Stern le16_to_cpus(&devstat); 26021da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 26031da177e4SLinus Torvalds dev_err(&udev->dev, 26041da177e4SLinus Torvalds "can't connect bus-powered hub " 26051da177e4SLinus Torvalds "to this port\n"); 26061da177e4SLinus Torvalds if (hub->has_indicators) { 26071da177e4SLinus Torvalds hub->indicator[port1-1] = 26081da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 2609c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 26101da177e4SLinus Torvalds } 26111da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 26121da177e4SLinus Torvalds goto loop_disable; 26131da177e4SLinus Torvalds } 26141da177e4SLinus Torvalds } 26151da177e4SLinus Torvalds 26161da177e4SLinus Torvalds /* check for devices running slower than they could */ 26171da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 26181da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 26191da177e4SLinus Torvalds && highspeed_hubs != 0) 26201da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 26211da177e4SLinus Torvalds 26221da177e4SLinus Torvalds /* Store the parent's children[] pointer. At this point 26231da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 26241da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 26251da177e4SLinus Torvalds */ 26261da177e4SLinus Torvalds status = 0; 26271da177e4SLinus Torvalds 26281da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 26291da177e4SLinus Torvalds * been disconnected; we would race with the 26301da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 26311da177e4SLinus Torvalds */ 26321da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 26331da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 26341da177e4SLinus Torvalds status = -ENOTCONN; 26351da177e4SLinus Torvalds else 26361da177e4SLinus Torvalds hdev->children[port1-1] = udev; 26371da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 26381da177e4SLinus Torvalds 26391da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 26401da177e4SLinus Torvalds if (!status) { 26411da177e4SLinus Torvalds status = usb_new_device(udev); 26421da177e4SLinus Torvalds if (status) { 26431da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 26441da177e4SLinus Torvalds hdev->children[port1-1] = NULL; 26451da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 26461da177e4SLinus Torvalds } 26471da177e4SLinus Torvalds } 26481da177e4SLinus Torvalds 26491da177e4SLinus Torvalds if (status) 26501da177e4SLinus Torvalds goto loop_disable; 26511da177e4SLinus Torvalds 26521da177e4SLinus Torvalds status = hub_power_remaining(hub); 26531da177e4SLinus Torvalds if (status) 265455c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 26551da177e4SLinus Torvalds 26561da177e4SLinus Torvalds return; 26571da177e4SLinus Torvalds 26581da177e4SLinus Torvalds loop_disable: 26591da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 26601da177e4SLinus Torvalds loop: 26611da177e4SLinus Torvalds ep0_reinit(udev); 26621da177e4SLinus Torvalds release_address(udev); 26631da177e4SLinus Torvalds usb_put_dev(udev); 2664ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 26651da177e4SLinus Torvalds break; 26661da177e4SLinus Torvalds } 26671da177e4SLinus Torvalds 26681da177e4SLinus Torvalds done: 26691da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 267090da096eSBalaji Rao if (hcd->driver->relinquish_port && !hub->hdev->parent) 267190da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 26721da177e4SLinus Torvalds } 26731da177e4SLinus Torvalds 26741da177e4SLinus Torvalds static void hub_events(void) 26751da177e4SLinus Torvalds { 26761da177e4SLinus Torvalds struct list_head *tmp; 26771da177e4SLinus Torvalds struct usb_device *hdev; 26781da177e4SLinus Torvalds struct usb_interface *intf; 26791da177e4SLinus Torvalds struct usb_hub *hub; 26801da177e4SLinus Torvalds struct device *hub_dev; 26811da177e4SLinus Torvalds u16 hubstatus; 26821da177e4SLinus Torvalds u16 hubchange; 26831da177e4SLinus Torvalds u16 portstatus; 26841da177e4SLinus Torvalds u16 portchange; 26851da177e4SLinus Torvalds int i, ret; 26861da177e4SLinus Torvalds int connect_change; 26871da177e4SLinus Torvalds 26881da177e4SLinus Torvalds /* 26891da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 26901da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 26911da177e4SLinus Torvalds * safe since we delete the hub from the event list. 26921da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 26931da177e4SLinus Torvalds */ 26941da177e4SLinus Torvalds while (1) { 26951da177e4SLinus Torvalds 26961da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 26971da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 26981da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 26991da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 27001da177e4SLinus Torvalds break; 27011da177e4SLinus Torvalds } 27021da177e4SLinus Torvalds 27031da177e4SLinus Torvalds tmp = hub_event_list.next; 27041da177e4SLinus Torvalds list_del_init(tmp); 27051da177e4SLinus Torvalds 27061da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 2707e8054854SAlan Stern kref_get(&hub->kref); 2708e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 27091da177e4SLinus Torvalds 2710e8054854SAlan Stern hdev = hub->hdev; 2711e8054854SAlan Stern hub_dev = hub->intfdev; 2712e8054854SAlan Stern intf = to_usb_interface(hub_dev); 271340f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 27141da177e4SLinus Torvalds hdev->state, hub->descriptor 27151da177e4SLinus Torvalds ? hub->descriptor->bNbrPorts 27161da177e4SLinus Torvalds : 0, 27171da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 27181da177e4SLinus Torvalds (u16) hub->change_bits[0], 271940f122f3SAlan Stern (u16) hub->event_bits[0]); 27201da177e4SLinus Torvalds 27211da177e4SLinus Torvalds /* Lock the device, then check to see if we were 27221da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 272306b84e8aSAlan Stern usb_lock_device(hdev); 2724e8054854SAlan Stern if (unlikely(hub->disconnected)) 27251da177e4SLinus Torvalds goto loop; 27261da177e4SLinus Torvalds 27271da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 27281da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 27297de18d8bSAlan Stern hub->error = -ENODEV; 27307de18d8bSAlan Stern hub_pre_reset(intf); 27311da177e4SLinus Torvalds goto loop; 27321da177e4SLinus Torvalds } 27331da177e4SLinus Torvalds 273440f122f3SAlan Stern /* Autoresume */ 273540f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 273640f122f3SAlan Stern if (ret) { 273740f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 27381da177e4SLinus Torvalds goto loop; 273940f122f3SAlan Stern } 274040f122f3SAlan Stern 274140f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 274240f122f3SAlan Stern if (hub->quiescing) 274340f122f3SAlan Stern goto loop_autopm; 27441da177e4SLinus Torvalds 27451da177e4SLinus Torvalds if (hub->error) { 27461da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 27471da177e4SLinus Torvalds hub->error); 27481da177e4SLinus Torvalds 27497de18d8bSAlan Stern ret = usb_reset_composite_device(hdev, intf); 27501da177e4SLinus Torvalds if (ret) { 27511da177e4SLinus Torvalds dev_dbg (hub_dev, 27521da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 275340f122f3SAlan Stern goto loop_autopm; 27541da177e4SLinus Torvalds } 27551da177e4SLinus Torvalds 27561da177e4SLinus Torvalds hub->nerrors = 0; 27571da177e4SLinus Torvalds hub->error = 0; 27581da177e4SLinus Torvalds } 27591da177e4SLinus Torvalds 27601da177e4SLinus Torvalds /* deal with port status changes */ 27611da177e4SLinus Torvalds for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { 27621da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 27631da177e4SLinus Torvalds continue; 27641da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 27651da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 27661da177e4SLinus Torvalds !connect_change && !hub->activating) 27671da177e4SLinus Torvalds continue; 27681da177e4SLinus Torvalds 27691da177e4SLinus Torvalds ret = hub_port_status(hub, i, 27701da177e4SLinus Torvalds &portstatus, &portchange); 27711da177e4SLinus Torvalds if (ret < 0) 27721da177e4SLinus Torvalds continue; 27731da177e4SLinus Torvalds 27741da177e4SLinus Torvalds if (hub->activating && !hdev->children[i-1] && 27751da177e4SLinus Torvalds (portstatus & 27761da177e4SLinus Torvalds USB_PORT_STAT_CONNECTION)) 27771da177e4SLinus Torvalds connect_change = 1; 27781da177e4SLinus Torvalds 27791da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 27801da177e4SLinus Torvalds clear_port_feature(hdev, i, 27811da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 27821da177e4SLinus Torvalds connect_change = 1; 27831da177e4SLinus Torvalds } 27841da177e4SLinus Torvalds 27851da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 27861da177e4SLinus Torvalds if (!connect_change) 27871da177e4SLinus Torvalds dev_dbg (hub_dev, 27881da177e4SLinus Torvalds "port %d enable change, " 27891da177e4SLinus Torvalds "status %08x\n", 27901da177e4SLinus Torvalds i, portstatus); 27911da177e4SLinus Torvalds clear_port_feature(hdev, i, 27921da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 27931da177e4SLinus Torvalds 27941da177e4SLinus Torvalds /* 27951da177e4SLinus Torvalds * EM interference sometimes causes badly 27961da177e4SLinus Torvalds * shielded USB devices to be shutdown by 27971da177e4SLinus Torvalds * the hub, this hack enables them again. 27981da177e4SLinus Torvalds * Works at least with mouse driver. 27991da177e4SLinus Torvalds */ 28001da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 28011da177e4SLinus Torvalds && !connect_change 28021da177e4SLinus Torvalds && hdev->children[i-1]) { 28031da177e4SLinus Torvalds dev_err (hub_dev, 28041da177e4SLinus Torvalds "port %i " 28051da177e4SLinus Torvalds "disabled by hub (EMI?), " 28061da177e4SLinus Torvalds "re-enabling...\n", 28071da177e4SLinus Torvalds i); 28081da177e4SLinus Torvalds connect_change = 1; 28091da177e4SLinus Torvalds } 28101da177e4SLinus Torvalds } 28111da177e4SLinus Torvalds 28121da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_SUSPEND) { 28131da177e4SLinus Torvalds clear_port_feature(hdev, i, 28141da177e4SLinus Torvalds USB_PORT_FEAT_C_SUSPEND); 28151da177e4SLinus Torvalds if (hdev->children[i-1]) { 28161da177e4SLinus Torvalds ret = remote_wakeup(hdev-> 28171da177e4SLinus Torvalds children[i-1]); 28181da177e4SLinus Torvalds if (ret < 0) 28191da177e4SLinus Torvalds connect_change = 1; 28201da177e4SLinus Torvalds } else { 28211da177e4SLinus Torvalds ret = -ENODEV; 28221da177e4SLinus Torvalds hub_port_disable(hub, i, 1); 28231da177e4SLinus Torvalds } 28241da177e4SLinus Torvalds dev_dbg (hub_dev, 28251da177e4SLinus Torvalds "resume on port %d, status %d\n", 28261da177e4SLinus Torvalds i, ret); 28271da177e4SLinus Torvalds } 28281da177e4SLinus Torvalds 28291da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 28301da177e4SLinus Torvalds dev_err (hub_dev, 28311da177e4SLinus Torvalds "over-current change on port %d\n", 28321da177e4SLinus Torvalds i); 28331da177e4SLinus Torvalds clear_port_feature(hdev, i, 28341da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 28351da177e4SLinus Torvalds hub_power_on(hub); 28361da177e4SLinus Torvalds } 28371da177e4SLinus Torvalds 28381da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 28391da177e4SLinus Torvalds dev_dbg (hub_dev, 28401da177e4SLinus Torvalds "reset change on port %d\n", 28411da177e4SLinus Torvalds i); 28421da177e4SLinus Torvalds clear_port_feature(hdev, i, 28431da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 28441da177e4SLinus Torvalds } 28451da177e4SLinus Torvalds 28461da177e4SLinus Torvalds if (connect_change) 28471da177e4SLinus Torvalds hub_port_connect_change(hub, i, 28481da177e4SLinus Torvalds portstatus, portchange); 28491da177e4SLinus Torvalds } /* end for i */ 28501da177e4SLinus Torvalds 28511da177e4SLinus Torvalds /* deal with hub status changes */ 28521da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 28531da177e4SLinus Torvalds ; /* do nothing */ 28541da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 28551da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 28561da177e4SLinus Torvalds else { 28571da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 28581da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 28591da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 286055c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 286155c52718SAlan Stern /* FIXME: Is this always true? */ 286255c52718SAlan Stern hub->limited_power = 1; 2863403fae78Sjidong xiao else 2864403fae78Sjidong xiao hub->limited_power = 0; 28651da177e4SLinus Torvalds } 28661da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 28671da177e4SLinus Torvalds dev_dbg (hub_dev, "overcurrent change\n"); 28681da177e4SLinus Torvalds msleep(500); /* Cool down */ 28691da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 28701da177e4SLinus Torvalds hub_power_on(hub); 28711da177e4SLinus Torvalds } 28721da177e4SLinus Torvalds } 28731da177e4SLinus Torvalds 28741da177e4SLinus Torvalds hub->activating = 0; 28751da177e4SLinus Torvalds 2876d5926ae7SAlan Stern /* If this is a root hub, tell the HCD it's okay to 2877d5926ae7SAlan Stern * re-enable port-change interrupts now. */ 2878d5cbad4bSAlan Stern if (!hdev->parent && !hub->busy_bits[0]) 2879d5926ae7SAlan Stern usb_enable_root_hub_irq(hdev->bus); 2880d5926ae7SAlan Stern 288140f122f3SAlan Stern loop_autopm: 288240f122f3SAlan Stern /* Allow autosuspend if we're not going to run again */ 288340f122f3SAlan Stern if (list_empty(&hub->event_list)) 288440f122f3SAlan Stern usb_autopm_enable(intf); 28851da177e4SLinus Torvalds loop: 28861da177e4SLinus Torvalds usb_unlock_device(hdev); 2887e8054854SAlan Stern kref_put(&hub->kref, hub_release); 28881da177e4SLinus Torvalds 28891da177e4SLinus Torvalds } /* end while (1) */ 28901da177e4SLinus Torvalds } 28911da177e4SLinus Torvalds 28921da177e4SLinus Torvalds static int hub_thread(void *__unused) 28931da177e4SLinus Torvalds { 289483144186SRafael J. Wysocki set_freezable(); 28951da177e4SLinus Torvalds do { 28961da177e4SLinus Torvalds hub_events(); 2897e42837bcSRafael J. Wysocki wait_event_freezable(khubd_wait, 28989c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 28999c8d6178Sakpm@osdl.org kthread_should_stop()); 29009c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 29011da177e4SLinus Torvalds 29021da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 29039c8d6178Sakpm@osdl.org return 0; 29041da177e4SLinus Torvalds } 29051da177e4SLinus Torvalds 29061da177e4SLinus Torvalds static struct usb_device_id hub_id_table [] = { 29071da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 29081da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 29091da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 29101da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 29111da177e4SLinus Torvalds { } /* Terminating entry */ 29121da177e4SLinus Torvalds }; 29131da177e4SLinus Torvalds 29141da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 29151da177e4SLinus Torvalds 29161da177e4SLinus Torvalds static struct usb_driver hub_driver = { 29171da177e4SLinus Torvalds .name = "hub", 29181da177e4SLinus Torvalds .probe = hub_probe, 29191da177e4SLinus Torvalds .disconnect = hub_disconnect, 29201da177e4SLinus Torvalds .suspend = hub_suspend, 29211da177e4SLinus Torvalds .resume = hub_resume, 2922f07600cfSAlan Stern .reset_resume = hub_reset_resume, 29237de18d8bSAlan Stern .pre_reset = hub_pre_reset, 29247de18d8bSAlan Stern .post_reset = hub_post_reset, 29251da177e4SLinus Torvalds .ioctl = hub_ioctl, 29261da177e4SLinus Torvalds .id_table = hub_id_table, 292740f122f3SAlan Stern .supports_autosuspend = 1, 29281da177e4SLinus Torvalds }; 29291da177e4SLinus Torvalds 29301da177e4SLinus Torvalds int usb_hub_init(void) 29311da177e4SLinus Torvalds { 29321da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 29331da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 29341da177e4SLinus Torvalds usbcore_name); 29351da177e4SLinus Torvalds return -1; 29361da177e4SLinus Torvalds } 29371da177e4SLinus Torvalds 29389c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 29399c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 29401da177e4SLinus Torvalds return 0; 29411da177e4SLinus Torvalds 29421da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 29431da177e4SLinus Torvalds usb_deregister(&hub_driver); 29441da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 29451da177e4SLinus Torvalds 29461da177e4SLinus Torvalds return -1; 29471da177e4SLinus Torvalds } 29481da177e4SLinus Torvalds 29491da177e4SLinus Torvalds void usb_hub_cleanup(void) 29501da177e4SLinus Torvalds { 29519c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 29521da177e4SLinus Torvalds 29531da177e4SLinus Torvalds /* 29541da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 29551da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 29561da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 29571da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 29581da177e4SLinus Torvalds * individual hub resources. -greg 29591da177e4SLinus Torvalds */ 29601da177e4SLinus Torvalds usb_deregister(&hub_driver); 29611da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 29621da177e4SLinus Torvalds 29631da177e4SLinus Torvalds static int config_descriptors_changed(struct usb_device *udev) 29641da177e4SLinus Torvalds { 29651da177e4SLinus Torvalds unsigned index; 29661da177e4SLinus Torvalds unsigned len = 0; 29671da177e4SLinus Torvalds struct usb_config_descriptor *buf; 29681da177e4SLinus Torvalds 29691da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 29701da177e4SLinus Torvalds if (len < le16_to_cpu(udev->config[index].desc.wTotalLength)) 29711da177e4SLinus Torvalds len = le16_to_cpu(udev->config[index].desc.wTotalLength); 29721da177e4SLinus Torvalds } 29730cc1a51fSOliver Neukum buf = kmalloc(len, GFP_NOIO); 29741da177e4SLinus Torvalds if (buf == NULL) { 29751da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 29761da177e4SLinus Torvalds /* assume the worst */ 29771da177e4SLinus Torvalds return 1; 29781da177e4SLinus Torvalds } 29791da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 29801da177e4SLinus Torvalds int length; 29811da177e4SLinus Torvalds int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 29821da177e4SLinus Torvalds 29831da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 29841da177e4SLinus Torvalds old_length); 29851da177e4SLinus Torvalds if (length < old_length) { 29861da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 29871da177e4SLinus Torvalds index, length); 29881da177e4SLinus Torvalds break; 29891da177e4SLinus Torvalds } 29901da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 29911da177e4SLinus Torvalds != 0) { 29921da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 29931da177e4SLinus Torvalds index, buf->bConfigurationValue); 29941da177e4SLinus Torvalds break; 29951da177e4SLinus Torvalds } 29961da177e4SLinus Torvalds } 29971da177e4SLinus Torvalds kfree(buf); 29981da177e4SLinus Torvalds return index != udev->descriptor.bNumConfigurations; 29991da177e4SLinus Torvalds } 30001da177e4SLinus Torvalds 30011da177e4SLinus Torvalds /** 30021da177e4SLinus Torvalds * usb_reset_device - perform a USB port reset to reinitialize a device 30031da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 30041da177e4SLinus Torvalds * 300579efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 300679efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 300779efa097SAlan Stern * Use usb_reset_composite_device() instead. 30081da177e4SLinus Torvalds * 30091da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 30101da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 30111da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 30121da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 30131da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 30141da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 30151da177e4SLinus Torvalds * re-enumerated and probed all over again. 30161da177e4SLinus Torvalds * 30171da177e4SLinus Torvalds * Returns 0 if the reset succeeded, -ENODEV if the device has been 30181da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 30191da177e4SLinus Torvalds * if the reset wasn't even attempted. 30201da177e4SLinus Torvalds * 30211da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 30221da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 30231da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 30241da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 30256bc6cff5SAlan Stern * 30266bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 30276bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 30286bc6cff5SAlan Stern * holding the device lock because these tasks should always call 30296bc6cff5SAlan Stern * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. 30301da177e4SLinus Torvalds */ 30311da177e4SLinus Torvalds int usb_reset_device(struct usb_device *udev) 30321da177e4SLinus Torvalds { 30331da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 30341da177e4SLinus Torvalds struct usb_hub *parent_hub; 30351da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 303612c3da34SAlan Stern int i, ret = 0; 303712c3da34SAlan Stern int port1 = udev->portnum; 30381da177e4SLinus Torvalds 30391da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 30401da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 30411da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 30421da177e4SLinus Torvalds udev->state); 30431da177e4SLinus Torvalds return -EINVAL; 30441da177e4SLinus Torvalds } 30451da177e4SLinus Torvalds 30461da177e4SLinus Torvalds if (!parent_hdev) { 30471da177e4SLinus Torvalds /* this requires hcd-specific logic; see OHCI hc_restart() */ 30481da177e4SLinus Torvalds dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__); 30491da177e4SLinus Torvalds return -EISDIR; 30501da177e4SLinus Torvalds } 30511da177e4SLinus Torvalds parent_hub = hdev_to_hub(parent_hdev); 30521da177e4SLinus Torvalds 30531da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 30541da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 30551da177e4SLinus Torvalds 30561da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 30571da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 30581da177e4SLinus Torvalds ep0_reinit(udev); 30591da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 3060dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 30611da177e4SLinus Torvalds break; 30621da177e4SLinus Torvalds } 30631da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 3064d5cbad4bSAlan Stern if (!parent_hdev->parent && !parent_hub->busy_bits[0]) 3065d5cbad4bSAlan Stern usb_enable_root_hub_irq(parent_hdev->bus); 3066d5cbad4bSAlan Stern 30671da177e4SLinus Torvalds if (ret < 0) 30681da177e4SLinus Torvalds goto re_enumerate; 30691da177e4SLinus Torvalds 30701da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 30711da177e4SLinus Torvalds if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor) 30721da177e4SLinus Torvalds || config_descriptors_changed (udev)) { 30731da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 30741da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 30751da177e4SLinus Torvalds goto re_enumerate; 30761da177e4SLinus Torvalds } 30771da177e4SLinus Torvalds 30781da177e4SLinus Torvalds if (!udev->actconfig) 30791da177e4SLinus Torvalds goto done; 30801da177e4SLinus Torvalds 30811da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 30821da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 30831da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 30841da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 30851da177e4SLinus Torvalds if (ret < 0) { 30861da177e4SLinus Torvalds dev_err(&udev->dev, 30871da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 30881da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 30891da177e4SLinus Torvalds goto re_enumerate; 30901da177e4SLinus Torvalds } 30911da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 30921da177e4SLinus Torvalds 30931da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 30941da177e4SLinus Torvalds struct usb_interface *intf = udev->actconfig->interface[i]; 30951da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 30961da177e4SLinus Torvalds 30971da177e4SLinus Torvalds /* set_interface resets host side toggle even 30981da177e4SLinus Torvalds * for altsetting zero. the interface may have no driver. 30991da177e4SLinus Torvalds */ 31001da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 31011da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 31021da177e4SLinus Torvalds desc->bAlternateSetting); 31031da177e4SLinus Torvalds if (ret < 0) { 31041da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 31051da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 31061da177e4SLinus Torvalds desc->bInterfaceNumber, 31071da177e4SLinus Torvalds desc->bAlternateSetting, 31081da177e4SLinus Torvalds ret); 31091da177e4SLinus Torvalds goto re_enumerate; 31101da177e4SLinus Torvalds } 31111da177e4SLinus Torvalds } 31121da177e4SLinus Torvalds 31131da177e4SLinus Torvalds done: 31141da177e4SLinus Torvalds return 0; 31151da177e4SLinus Torvalds 31161da177e4SLinus Torvalds re_enumerate: 31171da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 31181da177e4SLinus Torvalds return -ENODEV; 31191da177e4SLinus Torvalds } 3120782e70c6SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(usb_reset_device); 312179efa097SAlan Stern 312279efa097SAlan Stern /** 312379efa097SAlan Stern * usb_reset_composite_device - warn interface drivers and perform a USB port reset 312479efa097SAlan Stern * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 312579efa097SAlan Stern * @iface: interface bound to the driver making the request (optional) 312679efa097SAlan Stern * 312779efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 312879efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 312979efa097SAlan Stern * the reset is over (using their post_reset method). 313079efa097SAlan Stern * 313179efa097SAlan Stern * Return value is the same as for usb_reset_device(). 313279efa097SAlan Stern * 313379efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 313479efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 313579efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 313679efa097SAlan Stern * the device using usb_lock_device_for_reset(). 313779efa097SAlan Stern */ 313879efa097SAlan Stern int usb_reset_composite_device(struct usb_device *udev, 313979efa097SAlan Stern struct usb_interface *iface) 314079efa097SAlan Stern { 314179efa097SAlan Stern int ret; 3142852c4b43SAlan Stern int i; 314379efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 314479efa097SAlan Stern 314579efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 314679efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 314779efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 314879efa097SAlan Stern udev->state); 314979efa097SAlan Stern return -EINVAL; 315079efa097SAlan Stern } 315179efa097SAlan Stern 3152645daaabSAlan Stern /* Prevent autosuspend during the reset */ 315394fcda1fSAlan Stern usb_autoresume_device(udev); 3154645daaabSAlan Stern 315579efa097SAlan Stern if (iface && iface->condition != USB_INTERFACE_BINDING) 315679efa097SAlan Stern iface = NULL; 315779efa097SAlan Stern 315879efa097SAlan Stern if (config) { 3159852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 3160852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 316179efa097SAlan Stern struct usb_driver *drv; 316279efa097SAlan Stern 3163852c4b43SAlan Stern if (cintf->dev.driver) { 316479efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 316579efa097SAlan Stern if (drv->pre_reset) 316679efa097SAlan Stern (drv->pre_reset)(cintf); 3167f07600cfSAlan Stern /* FIXME: Unbind if pre_reset returns an error or isn't defined */ 316879efa097SAlan Stern } 316979efa097SAlan Stern } 317079efa097SAlan Stern } 317179efa097SAlan Stern 317279efa097SAlan Stern ret = usb_reset_device(udev); 317379efa097SAlan Stern 317479efa097SAlan Stern if (config) { 3175852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 3176852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 317779efa097SAlan Stern struct usb_driver *drv; 317879efa097SAlan Stern 3179852c4b43SAlan Stern if (cintf->dev.driver) { 318079efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 318179efa097SAlan Stern if (drv->post_reset) 3182f07600cfSAlan Stern (drv->post_reset)(cintf); 3183f07600cfSAlan Stern /* FIXME: Unbind if post_reset returns an error or isn't defined */ 318479efa097SAlan Stern } 318579efa097SAlan Stern } 318679efa097SAlan Stern } 318779efa097SAlan Stern 318894fcda1fSAlan Stern usb_autosuspend_device(udev); 318979efa097SAlan Stern return ret; 319079efa097SAlan Stern } 3191782e70c6SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(usb_reset_composite_device); 3192