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/uaccess.h> 271da177e4SLinus Torvalds #include <asm/byteorder.h> 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds #include "usb.h" 301da177e4SLinus Torvalds #include "hcd.h" 311da177e4SLinus Torvalds #include "hub.h" 321da177e4SLinus Torvalds 3354515fe5SAlan Stern #ifdef CONFIG_USB_PERSIST 3454515fe5SAlan Stern #define USB_PERSIST 1 3554515fe5SAlan Stern #else 3654515fe5SAlan Stern #define USB_PERSIST 0 3754515fe5SAlan Stern #endif 3854515fe5SAlan Stern 39f2a383e4SGreg Kroah-Hartman /* if we are in debug mode, always announce new devices */ 40f2a383e4SGreg Kroah-Hartman #ifdef DEBUG 41f2a383e4SGreg Kroah-Hartman #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES 42f2a383e4SGreg Kroah-Hartman #define CONFIG_USB_ANNOUNCE_NEW_DEVICES 43f2a383e4SGreg Kroah-Hartman #endif 44f2a383e4SGreg Kroah-Hartman #endif 45f2a383e4SGreg Kroah-Hartman 461bb5f66bSAlan Stern struct usb_hub { 471bb5f66bSAlan Stern struct device *intfdev; /* the "interface" device */ 481bb5f66bSAlan Stern struct usb_device *hdev; 49e8054854SAlan Stern struct kref kref; 501bb5f66bSAlan Stern struct urb *urb; /* for interrupt polling pipe */ 511bb5f66bSAlan Stern 521bb5f66bSAlan Stern /* buffer for urb ... with extra space in case of babble */ 531bb5f66bSAlan Stern char (*buffer)[8]; 541bb5f66bSAlan Stern dma_addr_t buffer_dma; /* DMA address for buffer */ 551bb5f66bSAlan Stern union { 561bb5f66bSAlan Stern struct usb_hub_status hub; 571bb5f66bSAlan Stern struct usb_port_status port; 581bb5f66bSAlan Stern } *status; /* buffer for status reports */ 59db90e7a1SAlan Stern struct mutex status_mutex; /* for the status buffer */ 601bb5f66bSAlan Stern 611bb5f66bSAlan Stern int error; /* last reported error */ 621bb5f66bSAlan Stern int nerrors; /* track consecutive errors */ 631bb5f66bSAlan Stern 641bb5f66bSAlan Stern struct list_head event_list; /* hubs w/data or errs ready */ 651bb5f66bSAlan Stern unsigned long event_bits[1]; /* status change bitmask */ 661bb5f66bSAlan Stern unsigned long change_bits[1]; /* ports with logical connect 671bb5f66bSAlan Stern status change */ 681bb5f66bSAlan Stern unsigned long busy_bits[1]; /* ports being reset or 691bb5f66bSAlan Stern resumed */ 701bb5f66bSAlan Stern #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ 711bb5f66bSAlan Stern #error event_bits[] is too short! 721bb5f66bSAlan Stern #endif 731bb5f66bSAlan Stern 741bb5f66bSAlan Stern struct usb_hub_descriptor *descriptor; /* class descriptor */ 751bb5f66bSAlan Stern struct usb_tt tt; /* Transaction Translator */ 761bb5f66bSAlan Stern 771bb5f66bSAlan Stern unsigned mA_per_port; /* current for each child */ 781bb5f66bSAlan Stern 791bb5f66bSAlan Stern unsigned limited_power:1; 801bb5f66bSAlan Stern unsigned quiescing:1; 811bb5f66bSAlan Stern unsigned activating:1; 82e8054854SAlan Stern unsigned disconnected:1; 831bb5f66bSAlan Stern 841bb5f66bSAlan Stern unsigned has_indicators:1; 851bb5f66bSAlan Stern u8 indicator[USB_MAXCHILDREN]; 866d5aefb8SDavid Howells struct delayed_work leds; 871bb5f66bSAlan Stern }; 881bb5f66bSAlan Stern 891bb5f66bSAlan Stern 901da177e4SLinus Torvalds /* Protect struct usb_device->state and ->children members 919ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 921da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 931da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds /* khubd's worklist and its lock */ 961da177e4SLinus Torvalds static DEFINE_SPINLOCK(hub_event_lock); 971da177e4SLinus Torvalds static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ 981da177e4SLinus Torvalds 991da177e4SLinus Torvalds /* Wakes up khubd */ 1001da177e4SLinus Torvalds static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); 1011da177e4SLinus Torvalds 1029c8d6178Sakpm@osdl.org static struct task_struct *khubd_task; 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 1051da177e4SLinus Torvalds static int blinkenlights = 0; 1061da177e4SLinus Torvalds module_param (blinkenlights, bool, S_IRUGO); 1071da177e4SLinus Torvalds MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds /* 1101da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 1111da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 1121da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 1131da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 1141da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 1151da177e4SLinus Torvalds * following module parameters. 1161da177e4SLinus Torvalds * 1171da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 1181da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 1191da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 1201da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 1211da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 1221da177e4SLinus Torvalds */ 1231da177e4SLinus Torvalds static int old_scheme_first = 0; 1241da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 1251da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 1261da177e4SLinus Torvalds "start with the old device initialization scheme"); 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds static int use_both_schemes = 1; 1291da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 1301da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 1311da177e4SLinus Torvalds "try the other device initialization scheme if the " 1321da177e4SLinus Torvalds "first one fails"); 1331da177e4SLinus Torvalds 13432fe0198SAlan Stern /* Mutual exclusion for EHCI CF initialization. This interferes with 13532fe0198SAlan Stern * port reset on some companion controllers. 13632fe0198SAlan Stern */ 13732fe0198SAlan Stern DECLARE_RWSEM(ehci_cf_port_reset_rwsem); 13832fe0198SAlan Stern EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); 13932fe0198SAlan Stern 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds static inline char *portspeed(int portstatus) 1421da177e4SLinus Torvalds { 1431da177e4SLinus Torvalds if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) 1441da177e4SLinus Torvalds return "480 Mb/s"; 1451da177e4SLinus Torvalds else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) 1461da177e4SLinus Torvalds return "1.5 Mb/s"; 1471da177e4SLinus Torvalds else 1481da177e4SLinus Torvalds return "12 Mb/s"; 1491da177e4SLinus Torvalds } 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 1521da177e4SLinus Torvalds static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev) 1531da177e4SLinus Torvalds { 1541da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1551da177e4SLinus Torvalds } 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 1581da177e4SLinus Torvalds static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) 1591da177e4SLinus Torvalds { 1601da177e4SLinus Torvalds int i, ret; 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 1631da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 1641da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 1651da177e4SLinus Torvalds USB_DT_HUB << 8, 0, data, size, 1661da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 1671da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 1681da177e4SLinus Torvalds return ret; 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds return -EINVAL; 1711da177e4SLinus Torvalds } 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds /* 1741da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 1751da177e4SLinus Torvalds */ 1761da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 1771da177e4SLinus Torvalds { 1781da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1791da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds /* 1831da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 1841da177e4SLinus Torvalds */ 1851da177e4SLinus Torvalds static int clear_port_feature(struct usb_device *hdev, int port1, int feature) 1861da177e4SLinus Torvalds { 1871da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1881da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 1891da177e4SLinus Torvalds NULL, 0, 1000); 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds /* 1931da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 1941da177e4SLinus Torvalds */ 1951da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 1961da177e4SLinus Torvalds { 1971da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1981da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 1991da177e4SLinus Torvalds NULL, 0, 1000); 2001da177e4SLinus Torvalds } 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds /* 2031da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 2041da177e4SLinus Torvalds * for info about using port indicators 2051da177e4SLinus Torvalds */ 2061da177e4SLinus Torvalds static void set_port_led( 2071da177e4SLinus Torvalds struct usb_hub *hub, 2081da177e4SLinus Torvalds int port1, 2091da177e4SLinus Torvalds int selector 2101da177e4SLinus Torvalds ) 2111da177e4SLinus Torvalds { 2121da177e4SLinus Torvalds int status = set_port_feature(hub->hdev, (selector << 8) | port1, 2131da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 2141da177e4SLinus Torvalds if (status < 0) 2151da177e4SLinus Torvalds dev_dbg (hub->intfdev, 2161da177e4SLinus Torvalds "port %d indicator %s status %d\n", 2171da177e4SLinus Torvalds port1, 2181da177e4SLinus Torvalds ({ char *s; switch (selector) { 2191da177e4SLinus Torvalds case HUB_LED_AMBER: s = "amber"; break; 2201da177e4SLinus Torvalds case HUB_LED_GREEN: s = "green"; break; 2211da177e4SLinus Torvalds case HUB_LED_OFF: s = "off"; break; 2221da177e4SLinus Torvalds case HUB_LED_AUTO: s = "auto"; break; 2231da177e4SLinus Torvalds default: s = "??"; break; 2241da177e4SLinus Torvalds }; s; }), 2251da177e4SLinus Torvalds status); 2261da177e4SLinus Torvalds } 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 2291da177e4SLinus Torvalds 230c4028958SDavid Howells static void led_work (struct work_struct *work) 2311da177e4SLinus Torvalds { 232c4028958SDavid Howells struct usb_hub *hub = 233c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 2341da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 2351da177e4SLinus Torvalds unsigned i; 2361da177e4SLinus Torvalds unsigned changed = 0; 2371da177e4SLinus Torvalds int cursor = -1; 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 2401da177e4SLinus Torvalds return; 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds for (i = 0; i < hub->descriptor->bNbrPorts; i++) { 2431da177e4SLinus Torvalds unsigned selector, mode; 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds /* 30%-50% duty cycle */ 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds switch (hub->indicator[i]) { 2481da177e4SLinus Torvalds /* cycle marker */ 2491da177e4SLinus Torvalds case INDICATOR_CYCLE: 2501da177e4SLinus Torvalds cursor = i; 2511da177e4SLinus Torvalds selector = HUB_LED_AUTO; 2521da177e4SLinus Torvalds mode = INDICATOR_AUTO; 2531da177e4SLinus Torvalds break; 2541da177e4SLinus Torvalds /* blinking green = sw attention */ 2551da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 2561da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2571da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 2581da177e4SLinus Torvalds break; 2591da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 2601da177e4SLinus Torvalds selector = HUB_LED_OFF; 2611da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 2621da177e4SLinus Torvalds break; 2631da177e4SLinus Torvalds /* blinking amber = hw attention */ 2641da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 2651da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2661da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 2671da177e4SLinus Torvalds break; 2681da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 2691da177e4SLinus Torvalds selector = HUB_LED_OFF; 2701da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 2711da177e4SLinus Torvalds break; 2721da177e4SLinus Torvalds /* blink green/amber = reserved */ 2731da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 2741da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2751da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 2761da177e4SLinus Torvalds break; 2771da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 2781da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2791da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 2801da177e4SLinus Torvalds break; 2811da177e4SLinus Torvalds default: 2821da177e4SLinus Torvalds continue; 2831da177e4SLinus Torvalds } 2841da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 2851da177e4SLinus Torvalds changed = 1; 2861da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 2871da177e4SLinus Torvalds hub->indicator[i] = mode; 2881da177e4SLinus Torvalds } 2891da177e4SLinus Torvalds if (!changed && blinkenlights) { 2901da177e4SLinus Torvalds cursor++; 2911da177e4SLinus Torvalds cursor %= hub->descriptor->bNbrPorts; 2921da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 2931da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 2941da177e4SLinus Torvalds changed++; 2951da177e4SLinus Torvalds } 2961da177e4SLinus Torvalds if (changed) 2971da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 2981da177e4SLinus Torvalds } 2991da177e4SLinus Torvalds 3001da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 3011da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 3021da177e4SLinus Torvalds #define USB_STS_RETRIES 5 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds /* 3051da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 3061da177e4SLinus Torvalds */ 3071da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 3081da177e4SLinus Torvalds struct usb_hub_status *data) 3091da177e4SLinus Torvalds { 3101da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 3111da177e4SLinus Torvalds 3121da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 3131da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3141da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 3151da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 3161da177e4SLinus Torvalds } 3171da177e4SLinus Torvalds return status; 3181da177e4SLinus Torvalds } 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds /* 3211da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 3221da177e4SLinus Torvalds */ 3231da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 3241da177e4SLinus Torvalds struct usb_port_status *data) 3251da177e4SLinus Torvalds { 3261da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 3291da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3301da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 3311da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 3321da177e4SLinus Torvalds } 3331da177e4SLinus Torvalds return status; 3341da177e4SLinus Torvalds } 3351da177e4SLinus Torvalds 3361da177e4SLinus Torvalds static void kick_khubd(struct usb_hub *hub) 3371da177e4SLinus Torvalds { 3381da177e4SLinus Torvalds unsigned long flags; 3391da177e4SLinus Torvalds 34040f122f3SAlan Stern /* Suppress autosuspend until khubd runs */ 34140f122f3SAlan Stern to_usb_interface(hub->intfdev)->pm_usage_cnt = 1; 34240f122f3SAlan Stern 3431da177e4SLinus Torvalds spin_lock_irqsave(&hub_event_lock, flags); 3442e2c5eeaSRoel Kluin if (!hub->disconnected && list_empty(&hub->event_list)) { 3451da177e4SLinus Torvalds list_add_tail(&hub->event_list, &hub_event_list); 3461da177e4SLinus Torvalds wake_up(&khubd_wait); 3471da177e4SLinus Torvalds } 3481da177e4SLinus Torvalds spin_unlock_irqrestore(&hub_event_lock, flags); 3491da177e4SLinus Torvalds } 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds void usb_kick_khubd(struct usb_device *hdev) 3521da177e4SLinus Torvalds { 353e8054854SAlan Stern /* FIXME: What if hdev isn't bound to the hub driver? */ 3541da177e4SLinus Torvalds kick_khubd(hdev_to_hub(hdev)); 3551da177e4SLinus Torvalds } 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 3597d12e780SDavid Howells static void hub_irq(struct urb *urb) 3601da177e4SLinus Torvalds { 361ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 362e015268dSAlan Stern int status = urb->status; 3631da177e4SLinus Torvalds int i; 3641da177e4SLinus Torvalds unsigned long bits; 3651da177e4SLinus Torvalds 366e015268dSAlan Stern switch (status) { 3671da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 3681da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 3691da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 3701da177e4SLinus Torvalds return; 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds default: /* presumably an error */ 3731da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 374e015268dSAlan Stern dev_dbg (hub->intfdev, "transfer --> %d\n", status); 3751da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 3761da177e4SLinus Torvalds goto resubmit; 377e015268dSAlan Stern hub->error = status; 3781da177e4SLinus Torvalds /* FALL THROUGH */ 3791da177e4SLinus Torvalds 3801da177e4SLinus Torvalds /* let khubd handle things */ 3811da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 3821da177e4SLinus Torvalds bits = 0; 3831da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 3841da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 3851da177e4SLinus Torvalds << (i*8); 3861da177e4SLinus Torvalds hub->event_bits[0] = bits; 3871da177e4SLinus Torvalds break; 3881da177e4SLinus Torvalds } 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds hub->nerrors = 0; 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds /* Something happened, let khubd figure it out */ 3931da177e4SLinus Torvalds kick_khubd(hub); 3941da177e4SLinus Torvalds 3951da177e4SLinus Torvalds resubmit: 3961da177e4SLinus Torvalds if (hub->quiescing) 3971da177e4SLinus Torvalds return; 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 4001da177e4SLinus Torvalds && status != -ENODEV && status != -EPERM) 4011da177e4SLinus Torvalds dev_err (hub->intfdev, "resubmit --> %d\n", status); 4021da177e4SLinus Torvalds } 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 4051da177e4SLinus Torvalds static inline int 4061da177e4SLinus Torvalds hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) 4071da177e4SLinus Torvalds { 4081da177e4SLinus Torvalds return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 4091da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 4101da177e4SLinus Torvalds tt, NULL, 0, 1000); 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds /* 4141da177e4SLinus Torvalds * enumeration blocks khubd for a long time. we use keventd instead, since 4151da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 4161da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 4171da177e4SLinus Torvalds * both can talk to the same hub concurrently. 4181da177e4SLinus Torvalds */ 419c4028958SDavid Howells static void hub_tt_kevent (struct work_struct *work) 4201da177e4SLinus Torvalds { 421c4028958SDavid Howells struct usb_hub *hub = 422c4028958SDavid Howells container_of(work, struct usb_hub, tt.kevent); 4231da177e4SLinus Torvalds unsigned long flags; 42455e5fdfaSMark Lord int limit = 100; 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 42755e5fdfaSMark Lord while (--limit && !list_empty (&hub->tt.clear_list)) { 4281da177e4SLinus Torvalds struct list_head *temp; 4291da177e4SLinus Torvalds struct usb_tt_clear *clear; 4301da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4311da177e4SLinus Torvalds int status; 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvalds temp = hub->tt.clear_list.next; 4341da177e4SLinus Torvalds clear = list_entry (temp, struct usb_tt_clear, clear_list); 4351da177e4SLinus Torvalds list_del (&clear->clear_list); 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 4381da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 4391da177e4SLinus Torvalds status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 4401da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 4411da177e4SLinus Torvalds 4421da177e4SLinus Torvalds if (status) 4431da177e4SLinus Torvalds dev_err (&hdev->dev, 4441da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 4451da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 4461da177e4SLinus Torvalds kfree(clear); 4471da177e4SLinus Torvalds } 4481da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 4491da177e4SLinus Torvalds } 4501da177e4SLinus Torvalds 4511da177e4SLinus Torvalds /** 4521da177e4SLinus Torvalds * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub 4531da177e4SLinus Torvalds * @udev: the device whose split transaction failed 4541da177e4SLinus Torvalds * @pipe: identifies the endpoint of the failed transaction 4551da177e4SLinus Torvalds * 4561da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 4571da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 4581da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 4591da177e4SLinus Torvalds * interrupt context. 4601da177e4SLinus Torvalds * 4611da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 4621da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 4631da177e4SLinus Torvalds */ 4641da177e4SLinus Torvalds void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe) 4651da177e4SLinus Torvalds { 4661da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 4671da177e4SLinus Torvalds unsigned long flags; 4681da177e4SLinus Torvalds struct usb_tt_clear *clear; 4691da177e4SLinus Torvalds 4701da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 4711da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 4721da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 4731da177e4SLinus Torvalds */ 47454e6ecb2SChristoph Lameter if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { 4751da177e4SLinus Torvalds dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 4761da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 4771da177e4SLinus Torvalds return; 4781da177e4SLinus Torvalds } 4791da177e4SLinus Torvalds 4801da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 4811da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 4821da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 4831da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 4841da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol (pipe) 4851da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 4861da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 4871da177e4SLinus Torvalds if (usb_pipein (pipe)) 4881da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 4911da177e4SLinus Torvalds spin_lock_irqsave (&tt->lock, flags); 4921da177e4SLinus Torvalds list_add_tail (&clear->clear_list, &tt->clear_list); 4931da177e4SLinus Torvalds schedule_work (&tt->kevent); 4941da177e4SLinus Torvalds spin_unlock_irqrestore (&tt->lock, flags); 4951da177e4SLinus Torvalds } 496782e70c6SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(usb_hub_tt_clear_buffer); 4971da177e4SLinus Torvalds 4981da177e4SLinus Torvalds static void hub_power_on(struct usb_hub *hub) 4991da177e4SLinus Torvalds { 5001da177e4SLinus Torvalds int port1; 501b789696aSDavid Brownell unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 5024489a571SAlan Stern u16 wHubCharacteristics = 5034489a571SAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 5041da177e4SLinus Torvalds 5054489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 5064489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 5074489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 5084489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 5094489a571SAlan Stern * unless we send these messages to the hub. 5104489a571SAlan Stern */ 5114489a571SAlan Stern if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) 5121da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 5134489a571SAlan Stern else 5144489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 5154489a571SAlan Stern "non-switchable hub\n"); 5161da177e4SLinus Torvalds for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) 5174489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 5181da177e4SLinus Torvalds 519b789696aSDavid Brownell /* Wait at least 100 msec for power to become stable */ 520b789696aSDavid Brownell msleep(max(pgood_delay, (unsigned) 100)); 5211da177e4SLinus Torvalds } 5221da177e4SLinus Torvalds 52302c399eeSAlan Stern static void hub_quiesce(struct usb_hub *hub) 5241da177e4SLinus Torvalds { 525979d5199SDavid Brownell /* (nonblocking) khubd and related activity won't re-trigger */ 5261da177e4SLinus Torvalds hub->quiescing = 1; 527c9f89fa4SDavid Brownell hub->activating = 0; 528979d5199SDavid Brownell 529979d5199SDavid Brownell /* (blocking) stop khubd and related activity */ 5301da177e4SLinus Torvalds usb_kill_urb(hub->urb); 5311da177e4SLinus Torvalds if (hub->has_indicators) 532d48bd977SAlan Stern cancel_delayed_work_sync(&hub->leds); 533d48bd977SAlan Stern if (hub->tt.hub) 534d48bd977SAlan Stern cancel_work_sync(&hub->tt.kevent); 5351da177e4SLinus Torvalds } 5361da177e4SLinus Torvalds 5371da177e4SLinus Torvalds static void hub_activate(struct usb_hub *hub) 5381da177e4SLinus Torvalds { 5391da177e4SLinus Torvalds int status; 5401da177e4SLinus Torvalds 5411da177e4SLinus Torvalds hub->quiescing = 0; 5421da177e4SLinus Torvalds hub->activating = 1; 54340f122f3SAlan Stern 5441da177e4SLinus Torvalds status = usb_submit_urb(hub->urb, GFP_NOIO); 5451da177e4SLinus Torvalds if (status < 0) 5461da177e4SLinus Torvalds dev_err(hub->intfdev, "activate --> %d\n", status); 5471da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 5481da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 5491da177e4SLinus Torvalds 5501da177e4SLinus Torvalds /* scan all ports ASAP */ 5511da177e4SLinus Torvalds kick_khubd(hub); 5521da177e4SLinus Torvalds } 5531da177e4SLinus Torvalds 5541da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 5551da177e4SLinus Torvalds u16 *status, u16 *change) 5561da177e4SLinus Torvalds { 5571da177e4SLinus Torvalds int ret; 5581da177e4SLinus Torvalds 559db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 5601da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 5611da177e4SLinus Torvalds if (ret < 0) 5621da177e4SLinus Torvalds dev_err (hub->intfdev, 5631da177e4SLinus Torvalds "%s failed (err = %d)\n", __FUNCTION__, ret); 5641da177e4SLinus Torvalds else { 5651da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 5661da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 5671da177e4SLinus Torvalds ret = 0; 5681da177e4SLinus Torvalds } 569db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 5701da177e4SLinus Torvalds return ret; 5711da177e4SLinus Torvalds } 5721da177e4SLinus Torvalds 5738b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 5748b28c752SAlan Stern { 5758b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 5760458d5b4SAlan Stern int ret = 0; 5778b28c752SAlan Stern 5780458d5b4SAlan Stern if (hdev->children[port1-1] && set_state) 5798b28c752SAlan Stern usb_set_device_state(hdev->children[port1-1], 5808b28c752SAlan Stern USB_STATE_NOTATTACHED); 5810458d5b4SAlan Stern if (!hub->error) 5828b28c752SAlan Stern ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); 5838b28c752SAlan Stern if (ret) 5848b28c752SAlan Stern dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 5858b28c752SAlan Stern port1, ret); 5868b28c752SAlan Stern return ret; 5878b28c752SAlan Stern } 5888b28c752SAlan Stern 5890458d5b4SAlan Stern /* 5900458d5b4SAlan Stern * Disable a port and mark a logical connnect-change event, so that some 5910458d5b4SAlan Stern * time later khubd will disconnect() any existing usb_device on the port 5920458d5b4SAlan Stern * and will re-enumerate if there actually is a device attached. 5930458d5b4SAlan Stern */ 5940458d5b4SAlan Stern static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 5957d069b7dSAlan Stern { 5960458d5b4SAlan Stern dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 5970458d5b4SAlan Stern hub_port_disable(hub, port1, 1); 5980458d5b4SAlan Stern 5990458d5b4SAlan Stern /* FIXME let caller ask to power down the port: 6000458d5b4SAlan Stern * - some devices won't enumerate without a VBUS power cycle 6010458d5b4SAlan Stern * - SRP saves power that way 6020458d5b4SAlan Stern * - ... new call, TBD ... 6030458d5b4SAlan Stern * That's easy if this hub can switch power per-port, and 6040458d5b4SAlan Stern * khubd reactivates the port later (timer, SRP, etc). 6050458d5b4SAlan Stern * Powerdown must be optional, because of reset/DFU. 6060458d5b4SAlan Stern */ 6070458d5b4SAlan Stern 6080458d5b4SAlan Stern set_bit(port1, hub->change_bits); 6090458d5b4SAlan Stern kick_khubd(hub); 6100458d5b4SAlan Stern } 6110458d5b4SAlan Stern 6120458d5b4SAlan Stern /* caller has locked the hub device */ 613f07600cfSAlan Stern static int hub_pre_reset(struct usb_interface *intf) 6140458d5b4SAlan Stern { 6150458d5b4SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 616b41a60ecSAlan Stern struct usb_device *hdev = hub->hdev; 617b41a60ecSAlan Stern int i; 6180458d5b4SAlan Stern 619b41a60ecSAlan Stern /* Disconnect all the children */ 620b41a60ecSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 621b41a60ecSAlan Stern if (hdev->children[i]) 622b41a60ecSAlan Stern usb_disconnect(&hdev->children[i]); 623b41a60ecSAlan Stern } 6247d069b7dSAlan Stern hub_quiesce(hub); 625f07600cfSAlan Stern return 0; 6267d069b7dSAlan Stern } 6277d069b7dSAlan Stern 6287d069b7dSAlan Stern /* caller has locked the hub device */ 629f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 6307d069b7dSAlan Stern { 6317de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 6327de18d8bSAlan Stern 6337d069b7dSAlan Stern hub_power_on(hub); 6340458d5b4SAlan Stern hub_activate(hub); 635f07600cfSAlan Stern return 0; 6367d069b7dSAlan Stern } 6377d069b7dSAlan Stern 6381da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 6391da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 6401da177e4SLinus Torvalds { 6411da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 6421da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 6431da177e4SLinus Torvalds u16 hubstatus, hubchange; 64474ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 6451da177e4SLinus Torvalds unsigned int pipe; 6461da177e4SLinus Torvalds int maxp, ret; 6471da177e4SLinus Torvalds char *message; 6481da177e4SLinus Torvalds 6491da177e4SLinus Torvalds hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL, 6501da177e4SLinus Torvalds &hub->buffer_dma); 6511da177e4SLinus Torvalds if (!hub->buffer) { 6521da177e4SLinus Torvalds message = "can't allocate hub irq buffer"; 6531da177e4SLinus Torvalds ret = -ENOMEM; 6541da177e4SLinus Torvalds goto fail; 6551da177e4SLinus Torvalds } 6561da177e4SLinus Torvalds 6571da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 6581da177e4SLinus Torvalds if (!hub->status) { 6591da177e4SLinus Torvalds message = "can't kmalloc hub status buffer"; 6601da177e4SLinus Torvalds ret = -ENOMEM; 6611da177e4SLinus Torvalds goto fail; 6621da177e4SLinus Torvalds } 663db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 6661da177e4SLinus Torvalds if (!hub->descriptor) { 6671da177e4SLinus Torvalds message = "can't kmalloc hub descriptor"; 6681da177e4SLinus Torvalds ret = -ENOMEM; 6691da177e4SLinus Torvalds goto fail; 6701da177e4SLinus Torvalds } 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvalds /* Request the entire hub descriptor. 6731da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 6741da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 6751da177e4SLinus Torvalds */ 6761da177e4SLinus Torvalds ret = get_hub_descriptor(hdev, hub->descriptor, 6771da177e4SLinus Torvalds sizeof(*hub->descriptor)); 6781da177e4SLinus Torvalds if (ret < 0) { 6791da177e4SLinus Torvalds message = "can't read hub descriptor"; 6801da177e4SLinus Torvalds goto fail; 6811da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 6821da177e4SLinus Torvalds message = "hub has too many ports!"; 6831da177e4SLinus Torvalds ret = -ENODEV; 6841da177e4SLinus Torvalds goto fail; 6851da177e4SLinus Torvalds } 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 6881da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 6891da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 6901da177e4SLinus Torvalds 69174ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 6921da177e4SLinus Torvalds 69374ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_COMPOUND) { 6941da177e4SLinus Torvalds int i; 6951da177e4SLinus Torvalds char portstr [USB_MAXCHILDREN + 1]; 6961da177e4SLinus Torvalds 6971da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 6981da177e4SLinus Torvalds portstr[i] = hub->descriptor->DeviceRemovable 6991da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 7001da177e4SLinus Torvalds ? 'F' : 'R'; 7011da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 7021da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 7031da177e4SLinus Torvalds } else 7041da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 7051da177e4SLinus Torvalds 70674ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 7071da177e4SLinus Torvalds case 0x00: 7081da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 7091da177e4SLinus Torvalds break; 7101da177e4SLinus Torvalds case 0x01: 7111da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 7121da177e4SLinus Torvalds break; 7131da177e4SLinus Torvalds case 0x02: 7141da177e4SLinus Torvalds case 0x03: 7151da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 7161da177e4SLinus Torvalds break; 7171da177e4SLinus Torvalds } 7181da177e4SLinus Torvalds 71974ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 7201da177e4SLinus Torvalds case 0x00: 7211da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 7221da177e4SLinus Torvalds break; 7231da177e4SLinus Torvalds case 0x08: 7241da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 7251da177e4SLinus Torvalds break; 7261da177e4SLinus Torvalds case 0x10: 7271da177e4SLinus Torvalds case 0x18: 7281da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 7291da177e4SLinus Torvalds break; 7301da177e4SLinus Torvalds } 7311da177e4SLinus Torvalds 7321da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 7331da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 734c4028958SDavid Howells INIT_WORK (&hub->tt.kevent, hub_tt_kevent); 7351da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 7361da177e4SLinus Torvalds case 0: 7371da177e4SLinus Torvalds break; 7381da177e4SLinus Torvalds case 1: 7391da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 7401da177e4SLinus Torvalds hub->tt.hub = hdev; 7411da177e4SLinus Torvalds break; 7421da177e4SLinus Torvalds case 2: 7431da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 7441da177e4SLinus Torvalds if (ret == 0) { 7451da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 7461da177e4SLinus Torvalds hub->tt.multi = 1; 7471da177e4SLinus Torvalds } else 7481da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 7491da177e4SLinus Torvalds ret); 7501da177e4SLinus Torvalds hub->tt.hub = hdev; 7511da177e4SLinus Torvalds break; 7521da177e4SLinus Torvalds default: 7531da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 7541da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 7551da177e4SLinus Torvalds break; 7561da177e4SLinus Torvalds } 7571da177e4SLinus Torvalds 758e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 75974ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 760e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 761e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 762e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 763e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 764e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 765e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 766e09711aeSdavid-b@pacbell.net } 7671da177e4SLinus Torvalds break; 768e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 769e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 770e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 771e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 772e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 7731da177e4SLinus Torvalds break; 774e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 775e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 776e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 777e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 778e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 7791da177e4SLinus Torvalds break; 780e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 781e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 782e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 783e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 784e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 7851da177e4SLinus Torvalds break; 7861da177e4SLinus Torvalds } 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 78974ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 7901da177e4SLinus Torvalds hub->has_indicators = 1; 7911da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 7921da177e4SLinus Torvalds } 7931da177e4SLinus Torvalds 7941da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 7951da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 7961da177e4SLinus Torvalds 7971da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 7981da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 7991da177e4SLinus Torvalds */ 8001da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 80155c52718SAlan Stern if (ret < 2) { 8021da177e4SLinus Torvalds message = "can't get hub status"; 8031da177e4SLinus Torvalds goto fail; 8041da177e4SLinus Torvalds } 8057d35b929SAlan Stern le16_to_cpus(&hubstatus); 8067d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 80755c52718SAlan Stern if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) 80855c52718SAlan Stern hub->mA_per_port = 500; 80955c52718SAlan Stern else { 81055c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 81155c52718SAlan Stern hub->limited_power = 1; 81255c52718SAlan Stern } 8137d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 8141da177e4SLinus Torvalds dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 8151da177e4SLinus Torvalds hub->descriptor->bHubContrCurrent); 81655c52718SAlan Stern hub->limited_power = 1; 81755c52718SAlan Stern if (hdev->maxchild > 0) { 81855c52718SAlan Stern int remaining = hdev->bus_mA - 81955c52718SAlan Stern hub->descriptor->bHubContrCurrent; 8201da177e4SLinus Torvalds 82155c52718SAlan Stern if (remaining < hdev->maxchild * 100) 82255c52718SAlan Stern dev_warn(hub_dev, 82355c52718SAlan Stern "insufficient power available " 82455c52718SAlan Stern "to use all downstream ports\n"); 82555c52718SAlan Stern hub->mA_per_port = 100; /* 7.2.1.1 */ 82655c52718SAlan Stern } 82755c52718SAlan Stern } else { /* Self-powered external hub */ 82855c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 82955c52718SAlan Stern * provide less current per port? */ 83055c52718SAlan Stern hub->mA_per_port = 500; 83155c52718SAlan Stern } 83255c52718SAlan Stern if (hub->mA_per_port < 500) 83355c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 83455c52718SAlan Stern hub->mA_per_port); 8351da177e4SLinus Torvalds 8361da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 8371da177e4SLinus Torvalds if (ret < 0) { 8381da177e4SLinus Torvalds message = "can't get hub status"; 8391da177e4SLinus Torvalds goto fail; 8401da177e4SLinus Torvalds } 8411da177e4SLinus Torvalds 8421da177e4SLinus Torvalds /* local power status reports aren't always correct */ 8431da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 8441da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 8451da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 8461da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 8471da177e4SLinus Torvalds 84874ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 8491da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 8501da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 8511da177e4SLinus Torvalds 85288fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 85388fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 85488fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 85588fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 85688fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 85788fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 8581da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 8591da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 8601da177e4SLinus Torvalds 8611da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 8621da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 8631da177e4SLinus Torvalds 8641da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 8651da177e4SLinus Torvalds if (!hub->urb) { 8661da177e4SLinus Torvalds message = "couldn't allocate interrupt urb"; 8671da177e4SLinus Torvalds ret = -ENOMEM; 8681da177e4SLinus Torvalds goto fail; 8691da177e4SLinus Torvalds } 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 8721da177e4SLinus Torvalds hub, endpoint->bInterval); 8731da177e4SLinus Torvalds hub->urb->transfer_dma = hub->buffer_dma; 8741da177e4SLinus Torvalds hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 8751da177e4SLinus Torvalds 8761da177e4SLinus Torvalds /* maybe cycle the hub leds */ 8771da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 8781da177e4SLinus Torvalds hub->indicator [0] = INDICATOR_CYCLE; 8791da177e4SLinus Torvalds 8801da177e4SLinus Torvalds hub_power_on(hub); 8811da177e4SLinus Torvalds hub_activate(hub); 8821da177e4SLinus Torvalds return 0; 8831da177e4SLinus Torvalds 8841da177e4SLinus Torvalds fail: 8851da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 8861da177e4SLinus Torvalds message, ret); 8871da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 8881da177e4SLinus Torvalds return ret; 8891da177e4SLinus Torvalds } 8901da177e4SLinus Torvalds 891e8054854SAlan Stern static void hub_release(struct kref *kref) 892e8054854SAlan Stern { 893e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 894e8054854SAlan Stern 895e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 896e8054854SAlan Stern kfree(hub); 897e8054854SAlan Stern } 898e8054854SAlan Stern 8991da177e4SLinus Torvalds static unsigned highspeed_hubs; 9001da177e4SLinus Torvalds 9011da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 9021da177e4SLinus Torvalds { 9031da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 904e8054854SAlan Stern 905e8054854SAlan Stern /* Take the hub off the event list and don't let it be added again */ 906e8054854SAlan Stern spin_lock_irq(&hub_event_lock); 907e8054854SAlan Stern list_del_init(&hub->event_list); 908e8054854SAlan Stern hub->disconnected = 1; 909e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 9101da177e4SLinus Torvalds 9117de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 9127de18d8bSAlan Stern hub->error = 0; 9137de18d8bSAlan Stern hub_pre_reset(intf); 9147de18d8bSAlan Stern 9158b28c752SAlan Stern usb_set_intfdata (intf, NULL); 9161da177e4SLinus Torvalds 917e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 9181da177e4SLinus Torvalds highspeed_hubs--; 9191da177e4SLinus Torvalds 9201da177e4SLinus Torvalds usb_free_urb(hub->urb); 9211da177e4SLinus Torvalds kfree(hub->descriptor); 9221da177e4SLinus Torvalds kfree(hub->status); 923e8054854SAlan Stern usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer, 9241da177e4SLinus Torvalds hub->buffer_dma); 9251da177e4SLinus Torvalds 926e8054854SAlan Stern kref_put(&hub->kref, hub_release); 9271da177e4SLinus Torvalds } 9281da177e4SLinus Torvalds 9291da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 9301da177e4SLinus Torvalds { 9311da177e4SLinus Torvalds struct usb_host_interface *desc; 9321da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 9331da177e4SLinus Torvalds struct usb_device *hdev; 9341da177e4SLinus Torvalds struct usb_hub *hub; 9351da177e4SLinus Torvalds 9361da177e4SLinus Torvalds desc = intf->cur_altsetting; 9371da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 9381da177e4SLinus Torvalds 93989ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 94089ccbdc9SDavid Brownell if (hdev->parent) { 94189ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 94289ccbdc9SDavid Brownell return -ENODEV; 94389ccbdc9SDavid Brownell } 94489ccbdc9SDavid Brownell #endif 94589ccbdc9SDavid Brownell 9461da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 9471da177e4SLinus Torvalds /* specs is not defined, but it works */ 9481da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 9491da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 9501da177e4SLinus Torvalds descriptor_error: 9511da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 9521da177e4SLinus Torvalds return -EIO; 9531da177e4SLinus Torvalds } 9541da177e4SLinus Torvalds 9551da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 9561da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 9571da177e4SLinus Torvalds goto descriptor_error; 9581da177e4SLinus Torvalds 9591da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 9601da177e4SLinus Torvalds 961fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 962fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 9631da177e4SLinus Torvalds goto descriptor_error; 9641da177e4SLinus Torvalds 9651da177e4SLinus Torvalds /* We found a hub */ 9661da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 9671da177e4SLinus Torvalds 9680a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 9691da177e4SLinus Torvalds if (!hub) { 9701da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 9711da177e4SLinus Torvalds return -ENOMEM; 9721da177e4SLinus Torvalds } 9731da177e4SLinus Torvalds 974e8054854SAlan Stern kref_init(&hub->kref); 9751da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 9761da177e4SLinus Torvalds hub->intfdev = &intf->dev; 9771da177e4SLinus Torvalds hub->hdev = hdev; 978c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 979e8054854SAlan Stern usb_get_intf(intf); 9801da177e4SLinus Torvalds 9811da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 98240f122f3SAlan Stern intf->needs_remote_wakeup = 1; 9831da177e4SLinus Torvalds 9841da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 9851da177e4SLinus Torvalds highspeed_hubs++; 9861da177e4SLinus Torvalds 9871da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 9881da177e4SLinus Torvalds return 0; 9891da177e4SLinus Torvalds 9901da177e4SLinus Torvalds hub_disconnect (intf); 9911da177e4SLinus Torvalds return -ENODEV; 9921da177e4SLinus Torvalds } 9931da177e4SLinus Torvalds 9941da177e4SLinus Torvalds static int 9951da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 9961da177e4SLinus Torvalds { 9971da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 9981da177e4SLinus Torvalds 9991da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 10001da177e4SLinus Torvalds switch (code) { 10011da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 10021da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 10031da177e4SLinus Torvalds int i; 10041da177e4SLinus Torvalds 10051da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 10061da177e4SLinus Torvalds if (hdev->devnum <= 0) 10071da177e4SLinus Torvalds info->nports = 0; 10081da177e4SLinus Torvalds else { 10091da177e4SLinus Torvalds info->nports = hdev->maxchild; 10101da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 10111da177e4SLinus Torvalds if (hdev->children[i] == NULL) 10121da177e4SLinus Torvalds info->port[i] = 0; 10131da177e4SLinus Torvalds else 10141da177e4SLinus Torvalds info->port[i] = 10151da177e4SLinus Torvalds hdev->children[i]->devnum; 10161da177e4SLinus Torvalds } 10171da177e4SLinus Torvalds } 10181da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 10191da177e4SLinus Torvalds 10201da177e4SLinus Torvalds return info->nports + 1; 10211da177e4SLinus Torvalds } 10221da177e4SLinus Torvalds 10231da177e4SLinus Torvalds default: 10241da177e4SLinus Torvalds return -ENOSYS; 10251da177e4SLinus Torvalds } 10261da177e4SLinus Torvalds } 10271da177e4SLinus Torvalds 10281da177e4SLinus Torvalds 10291da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 10301da177e4SLinus Torvalds { 10311da177e4SLinus Torvalds int i; 10321da177e4SLinus Torvalds 10331da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 10341da177e4SLinus Torvalds if (udev->children[i]) 10351da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev->children[i]); 10361da177e4SLinus Torvalds } 103715123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED) { 1038ee49fb5dSAlan Stern udev->discon_suspended = 1; 103915123006SSarah Sharp udev->active_duration -= jiffies; 104015123006SSarah Sharp } 10411da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 10421da177e4SLinus Torvalds } 10431da177e4SLinus Torvalds 10441da177e4SLinus Torvalds /** 10451da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 10461da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 10471da177e4SLinus Torvalds * @new_state: new state value to be stored 10481da177e4SLinus Torvalds * 10491da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 10501da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 10511da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 10521da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 10531da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 10541da177e4SLinus Torvalds * all changes to any device's state must be protected by the 10551da177e4SLinus Torvalds * device_state_lock spinlock. 10561da177e4SLinus Torvalds * 10571da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 10581da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 10591da177e4SLinus Torvalds * 10601da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 10611da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 10621da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 10631da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 10641da177e4SLinus Torvalds */ 10651da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 10661da177e4SLinus Torvalds enum usb_device_state new_state) 10671da177e4SLinus Torvalds { 10681da177e4SLinus Torvalds unsigned long flags; 10691da177e4SLinus Torvalds 10701da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 10711da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 10721da177e4SLinus Torvalds ; /* do nothing */ 1073b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1074fb669cc0SDavid Brownell 1075fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1076fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1077fb669cc0SDavid Brownell */ 1078fb669cc0SDavid Brownell if (udev->parent) { 1079645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1080645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1081645daaabSAlan Stern ; /* No change to wakeup settings */ 1082645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 1083b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 1084b94dc6b5SDavid Brownell (udev->actconfig->desc.bmAttributes 1085b94dc6b5SDavid Brownell & USB_CONFIG_ATT_WAKEUP)); 1086645daaabSAlan Stern else 1087b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 0); 1088fb669cc0SDavid Brownell } 108915123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED && 109015123006SSarah Sharp new_state != USB_STATE_SUSPENDED) 109115123006SSarah Sharp udev->active_duration -= jiffies; 109215123006SSarah Sharp else if (new_state == USB_STATE_SUSPENDED && 109315123006SSarah Sharp udev->state != USB_STATE_SUSPENDED) 109415123006SSarah Sharp udev->active_duration += jiffies; 1095645daaabSAlan Stern udev->state = new_state; 1096b94dc6b5SDavid Brownell } else 10971da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 10981da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 10991da177e4SLinus Torvalds } 11001da177e4SLinus Torvalds 11011da177e4SLinus Torvalds static void choose_address(struct usb_device *udev) 11021da177e4SLinus Torvalds { 11031da177e4SLinus Torvalds int devnum; 11041da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 11051da177e4SLinus Torvalds 11061da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 11071da177e4SLinus Torvalds 11081da177e4SLinus Torvalds /* Try to allocate the next devnum beginning at bus->devnum_next. */ 11091da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 11101da177e4SLinus Torvalds bus->devnum_next); 11111da177e4SLinus Torvalds if (devnum >= 128) 11121da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1); 11131da177e4SLinus Torvalds 11141da177e4SLinus Torvalds bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); 11151da177e4SLinus Torvalds 11161da177e4SLinus Torvalds if (devnum < 128) { 11171da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 11181da177e4SLinus Torvalds udev->devnum = devnum; 11191da177e4SLinus Torvalds } 11201da177e4SLinus Torvalds } 11211da177e4SLinus Torvalds 11221da177e4SLinus Torvalds static void release_address(struct usb_device *udev) 11231da177e4SLinus Torvalds { 11241da177e4SLinus Torvalds if (udev->devnum > 0) { 11251da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 11261da177e4SLinus Torvalds udev->devnum = -1; 11271da177e4SLinus Torvalds } 11281da177e4SLinus Torvalds } 11291da177e4SLinus Torvalds 1130d5d4db70SAlan Stern #ifdef CONFIG_USB_SUSPEND 1131d5d4db70SAlan Stern 1132d5d4db70SAlan Stern static void usb_stop_pm(struct usb_device *udev) 1133d5d4db70SAlan Stern { 1134d5d4db70SAlan Stern /* Synchronize with the ksuspend thread to prevent any more 1135d5d4db70SAlan Stern * autosuspend requests from being submitted, and decrement 1136d5d4db70SAlan Stern * the parent's count of unsuspended children. 1137d5d4db70SAlan Stern */ 1138d5d4db70SAlan Stern usb_pm_lock(udev); 1139d5d4db70SAlan Stern if (udev->parent && !udev->discon_suspended) 1140d5d4db70SAlan Stern usb_autosuspend_device(udev->parent); 1141d5d4db70SAlan Stern usb_pm_unlock(udev); 1142d5d4db70SAlan Stern 1143d5d4db70SAlan Stern /* Stop any autosuspend requests already submitted */ 1144d5d4db70SAlan Stern cancel_rearming_delayed_work(&udev->autosuspend); 1145d5d4db70SAlan Stern } 1146d5d4db70SAlan Stern 1147d5d4db70SAlan Stern #else 1148d5d4db70SAlan Stern 1149d5d4db70SAlan Stern static inline void usb_stop_pm(struct usb_device *udev) 1150d5d4db70SAlan Stern { } 1151d5d4db70SAlan Stern 1152d5d4db70SAlan Stern #endif 1153d5d4db70SAlan Stern 11541da177e4SLinus Torvalds /** 11551da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 11561da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 11571da177e4SLinus Torvalds * Context: !in_interrupt () 11581da177e4SLinus Torvalds * 11591da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 11601da177e4SLinus Torvalds * 11611da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 11621da177e4SLinus Torvalds * If *pdev is a root hub then this routine will acquire the 11631da177e4SLinus Torvalds * usb_bus_list_lock on behalf of the caller. 11641da177e4SLinus Torvalds * 11651da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 11661da177e4SLinus Torvalds * controllers) should ever call this. 11671da177e4SLinus Torvalds * 11681da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 11691da177e4SLinus Torvalds */ 11701da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 11711da177e4SLinus Torvalds { 11721da177e4SLinus Torvalds struct usb_device *udev = *pdev; 11731da177e4SLinus Torvalds int i; 11741da177e4SLinus Torvalds 11751da177e4SLinus Torvalds if (!udev) { 11761da177e4SLinus Torvalds pr_debug ("%s nodev\n", __FUNCTION__); 11771da177e4SLinus Torvalds return; 11781da177e4SLinus Torvalds } 11791da177e4SLinus Torvalds 11801da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 11811da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 11821da177e4SLinus Torvalds * this quiesces everyting except pending urbs. 11831da177e4SLinus Torvalds */ 11841da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 11851da177e4SLinus Torvalds dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); 11861da177e4SLinus Torvalds 11879ad3d6ccSAlan Stern usb_lock_device(udev); 11889ad3d6ccSAlan Stern 11891da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 11901da177e4SLinus Torvalds for (i = 0; i < USB_MAXCHILDREN; i++) { 11911da177e4SLinus Torvalds if (udev->children[i]) 11921da177e4SLinus Torvalds usb_disconnect(&udev->children[i]); 11931da177e4SLinus Torvalds } 11941da177e4SLinus Torvalds 11951da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 11961da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 11971da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 11981da177e4SLinus Torvalds */ 1199782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 12001da177e4SLinus Torvalds usb_disable_device(udev, 0); 12011da177e4SLinus Torvalds 1202782da727SAlan Stern usb_unlock_device(udev); 12033099e75aSGreg Kroah-Hartman 1204782da727SAlan Stern /* Unregister the device. The device driver is responsible 1205782da727SAlan Stern * for removing the device files from usbfs and sysfs and for 1206782da727SAlan Stern * de-configuring the device. 1207782da727SAlan Stern */ 1208782da727SAlan Stern device_del(&udev->dev); 1209782da727SAlan Stern 1210782da727SAlan Stern /* Free the device number and delete the parent's children[] 12111da177e4SLinus Torvalds * (or root_hub) pointer. 12121da177e4SLinus Torvalds */ 12131da177e4SLinus Torvalds release_address(udev); 12141da177e4SLinus Torvalds 12151da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 12161da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 12171da177e4SLinus Torvalds *pdev = NULL; 12181da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 12191da177e4SLinus Torvalds 1220d5d4db70SAlan Stern usb_stop_pm(udev); 1221ee49fb5dSAlan Stern 1222782da727SAlan Stern put_device(&udev->dev); 12231da177e4SLinus Torvalds } 12241da177e4SLinus Torvalds 1225f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 12261da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 12271da177e4SLinus Torvalds { 12281da177e4SLinus Torvalds if (!string) 12291da177e4SLinus Torvalds return; 12301da177e4SLinus Torvalds dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); 12311da177e4SLinus Torvalds } 12321da177e4SLinus Torvalds 1233f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 1234f2a383e4SGreg Kroah-Hartman { 1235f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", 1236f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 1237f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idProduct)); 1238f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device strings: Mfr=%d, Product=%d, " 1239f2a383e4SGreg Kroah-Hartman "SerialNumber=%d\n", 1240f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 1241f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 1242f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 1243f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 1244f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 1245f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 1246f2a383e4SGreg Kroah-Hartman } 12471da177e4SLinus Torvalds #else 1248f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 12491da177e4SLinus Torvalds #endif 12501da177e4SLinus Torvalds 12511da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 12521da177e4SLinus Torvalds #include "otg_whitelist.h" 12531da177e4SLinus Torvalds #endif 12541da177e4SLinus Torvalds 12553ede760fSOliver Neukum /** 1256d9d16e8aSInaky Perez-Gonzalez * usb_configure_device_otg - FIXME (usbcore-internal) 12573ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 12583ede760fSOliver Neukum * 1259d9d16e8aSInaky Perez-Gonzalez * Do configuration for On-The-Go devices 12603ede760fSOliver Neukum */ 1261d9d16e8aSInaky Perez-Gonzalez static int usb_configure_device_otg(struct usb_device *udev) 12621da177e4SLinus Torvalds { 1263d9d16e8aSInaky Perez-Gonzalez int err = 0; 12641da177e4SLinus Torvalds 12651da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 12661da177e4SLinus Torvalds /* 12671da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 12681da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 12691da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 12701da177e4SLinus Torvalds */ 12711da177e4SLinus Torvalds if (!udev->bus->is_b_host 12721da177e4SLinus Torvalds && udev->config 12731da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 12741da177e4SLinus Torvalds struct usb_otg_descriptor *desc = 0; 12751da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 12761da177e4SLinus Torvalds 12771da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 12781da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 12791da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 12801da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 12811da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 128212c3da34SAlan Stern unsigned port1 = udev->portnum; 12831da177e4SLinus Torvalds 12841da177e4SLinus Torvalds dev_info(&udev->dev, 12851da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 12861da177e4SLinus Torvalds (port1 == bus->otg_port) 12871da177e4SLinus Torvalds ? "" : "non-"); 12881da177e4SLinus Torvalds 12891da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 12901da177e4SLinus Torvalds if (port1 == bus->otg_port) 12911da177e4SLinus Torvalds bus->b_hnp_enable = 1; 12921da177e4SLinus Torvalds err = usb_control_msg(udev, 12931da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 12941da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 12951da177e4SLinus Torvalds bus->b_hnp_enable 12961da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 12971da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 12981da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 12991da177e4SLinus Torvalds if (err < 0) { 13001da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 13011da177e4SLinus Torvalds * customize to match your product. 13021da177e4SLinus Torvalds */ 13031da177e4SLinus Torvalds dev_info(&udev->dev, 13041da177e4SLinus Torvalds "can't set HNP mode; %d\n", 13051da177e4SLinus Torvalds err); 13061da177e4SLinus Torvalds bus->b_hnp_enable = 0; 13071da177e4SLinus Torvalds } 13081da177e4SLinus Torvalds } 13091da177e4SLinus Torvalds } 13101da177e4SLinus Torvalds } 13111da177e4SLinus Torvalds 13121da177e4SLinus Torvalds if (!is_targeted(udev)) { 13131da177e4SLinus Torvalds 13141da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 13151da177e4SLinus Torvalds * (Includes HNP test device.) 13161da177e4SLinus Torvalds */ 13171da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 13184956eccdSAlan Stern err = usb_port_suspend(udev); 13191da177e4SLinus Torvalds if (err < 0) 13201da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 13211da177e4SLinus Torvalds } 1322ffcdc18dSVikram Pandita err = -ENOTSUPP; 13231da177e4SLinus Torvalds goto fail; 13241da177e4SLinus Torvalds } 1325d9d16e8aSInaky Perez-Gonzalez fail: 13261da177e4SLinus Torvalds #endif 1327d9d16e8aSInaky Perez-Gonzalez return err; 1328d9d16e8aSInaky Perez-Gonzalez } 13291da177e4SLinus Torvalds 1330d9d16e8aSInaky Perez-Gonzalez 1331d9d16e8aSInaky Perez-Gonzalez /** 1332d9d16e8aSInaky Perez-Gonzalez * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal) 1333d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 1334d9d16e8aSInaky Perez-Gonzalez * 1335d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 1336d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 1337d9d16e8aSInaky Perez-Gonzalez * environment. 1338d9d16e8aSInaky Perez-Gonzalez * 1339d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 1340d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 1341d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 1342d9d16e8aSInaky Perez-Gonzalez */ 1343d9d16e8aSInaky Perez-Gonzalez static int usb_configure_device(struct usb_device *udev) 1344d9d16e8aSInaky Perez-Gonzalez { 1345d9d16e8aSInaky Perez-Gonzalez int err; 1346d9d16e8aSInaky Perez-Gonzalez 1347d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 1348d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 1349d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 1350d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 1351d9d16e8aSInaky Perez-Gonzalez err); 1352d9d16e8aSInaky Perez-Gonzalez goto fail; 1353d9d16e8aSInaky Perez-Gonzalez } 1354d9d16e8aSInaky Perez-Gonzalez } 1355d9d16e8aSInaky Perez-Gonzalez if (udev->wusb == 1 && udev->authorized == 0) { 1356d9d16e8aSInaky Perez-Gonzalez udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1357d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1358d9d16e8aSInaky Perez-Gonzalez udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1359d9d16e8aSInaky Perez-Gonzalez } 1360d9d16e8aSInaky Perez-Gonzalez else { 1361d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 1362d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 1363d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 1364d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 1365d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 1366d9d16e8aSInaky Perez-Gonzalez } 1367d9d16e8aSInaky Perez-Gonzalez err = usb_configure_device_otg(udev); 1368d9d16e8aSInaky Perez-Gonzalez fail: 1369d9d16e8aSInaky Perez-Gonzalez return err; 1370d9d16e8aSInaky Perez-Gonzalez } 1371d9d16e8aSInaky Perez-Gonzalez 1372d9d16e8aSInaky Perez-Gonzalez 1373d9d16e8aSInaky Perez-Gonzalez /** 1374d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 1375d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 1376d9d16e8aSInaky Perez-Gonzalez * 1377d9d16e8aSInaky Perez-Gonzalez * This is called with devices which have been enumerated, but not yet 1378d9d16e8aSInaky Perez-Gonzalez * configured. The device descriptor is available, but not descriptors 1379d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 1380d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 1381d9d16e8aSInaky Perez-Gonzalez * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 1382d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 1383d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 1384d9d16e8aSInaky Perez-Gonzalez * 1385d9d16e8aSInaky Perez-Gonzalez * It will return if the device is configured properly or not. Zero if 1386d9d16e8aSInaky Perez-Gonzalez * the interface was registered with the driver core; else a negative 1387d9d16e8aSInaky Perez-Gonzalez * errno value. 1388d9d16e8aSInaky Perez-Gonzalez * 1389d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 1390d9d16e8aSInaky Perez-Gonzalez * 1391d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 1392d9d16e8aSInaky Perez-Gonzalez */ 1393d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 1394d9d16e8aSInaky Perez-Gonzalez { 1395d9d16e8aSInaky Perez-Gonzalez int err; 1396d9d16e8aSInaky Perez-Gonzalez 1397d9d16e8aSInaky Perez-Gonzalez usb_detect_quirks(udev); /* Determine quirks */ 1398d9d16e8aSInaky Perez-Gonzalez err = usb_configure_device(udev); /* detect & probe dev/intfs */ 1399d9d16e8aSInaky Perez-Gonzalez if (err < 0) 1400d9d16e8aSInaky Perez-Gonzalez goto fail; 14019f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 14029f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 14039f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 14049f8b17e6SKay Sievers 1405195af2ccSAlan Stern /* Increment the parent's count of unsuspended children */ 1406195af2ccSAlan Stern if (udev->parent) 1407195af2ccSAlan Stern usb_autoresume_device(udev->parent); 1408195af2ccSAlan Stern 1409782da727SAlan Stern /* Register the device. The device driver is responsible 14109f8b17e6SKay Sievers * for adding the device files to sysfs and for configuring 14119f8b17e6SKay Sievers * the device. 1412782da727SAlan Stern */ 14131da177e4SLinus Torvalds err = device_add(&udev->dev); 14141da177e4SLinus Torvalds if (err) { 14151da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 14161da177e4SLinus Torvalds goto fail; 14171da177e4SLinus Torvalds } 14189ad3d6ccSAlan Stern 1419d9d16e8aSInaky Perez-Gonzalez /* Tell the world! */ 1420f2a383e4SGreg Kroah-Hartman announce_device(udev); 1421c066475eSGreg Kroah-Hartman return err; 14221da177e4SLinus Torvalds 14231da177e4SLinus Torvalds fail: 14241da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 1425d9d16e8aSInaky Perez-Gonzalez return err; 14261da177e4SLinus Torvalds } 14271da177e4SLinus Torvalds 142893993a0aSInaky Perez-Gonzalez 142993993a0aSInaky Perez-Gonzalez /** 1430fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 1431fd39c86bSRandy Dunlap * @usb_dev: USB device 1432fd39c86bSRandy Dunlap * 1433fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 1434fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 143593993a0aSInaky Perez-Gonzalez * 143693993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 143793993a0aSInaky Perez-Gonzalez * defer its call. 143893993a0aSInaky Perez-Gonzalez */ 143993993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 144093993a0aSInaky Perez-Gonzalez { 144193993a0aSInaky Perez-Gonzalez unsigned cnt; 144293993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 144393993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 144493993a0aSInaky Perez-Gonzalez goto out_unauthorized; 144593993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 144693993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 144793993a0aSInaky Perez-Gonzalez usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 144893993a0aSInaky Perez-Gonzalez usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 144993993a0aSInaky Perez-Gonzalez usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 145093993a0aSInaky Perez-Gonzalez kfree(usb_dev->config); 145193993a0aSInaky Perez-Gonzalez usb_dev->config = NULL; 145293993a0aSInaky Perez-Gonzalez for (cnt = 0; cnt < usb_dev->descriptor.bNumConfigurations; cnt++) 145393993a0aSInaky Perez-Gonzalez kfree(usb_dev->rawdescriptors[cnt]); 145493993a0aSInaky Perez-Gonzalez usb_dev->descriptor.bNumConfigurations = 0; 145593993a0aSInaky Perez-Gonzalez kfree(usb_dev->rawdescriptors); 145693993a0aSInaky Perez-Gonzalez out_unauthorized: 145793993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 145893993a0aSInaky Perez-Gonzalez return 0; 145993993a0aSInaky Perez-Gonzalez } 146093993a0aSInaky Perez-Gonzalez 146193993a0aSInaky Perez-Gonzalez 146293993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 146393993a0aSInaky Perez-Gonzalez { 146493993a0aSInaky Perez-Gonzalez int result = 0, c; 146593993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 146693993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 146793993a0aSInaky Perez-Gonzalez goto out_authorized; 146893993a0aSInaky Perez-Gonzalez kfree(usb_dev->product); 146993993a0aSInaky Perez-Gonzalez usb_dev->product = NULL; 147093993a0aSInaky Perez-Gonzalez kfree(usb_dev->manufacturer); 147193993a0aSInaky Perez-Gonzalez usb_dev->manufacturer = NULL; 147293993a0aSInaky Perez-Gonzalez kfree(usb_dev->serial); 147393993a0aSInaky Perez-Gonzalez usb_dev->serial = NULL; 147493993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 147593993a0aSInaky Perez-Gonzalez if (result < 0) { 147693993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 147793993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 147893993a0aSInaky Perez-Gonzalez goto error_autoresume; 147993993a0aSInaky Perez-Gonzalez } 148093993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 148193993a0aSInaky Perez-Gonzalez if (result < 0) { 148293993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 148393993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 148493993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 148593993a0aSInaky Perez-Gonzalez } 148693993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 148793993a0aSInaky Perez-Gonzalez result = usb_configure_device(usb_dev); 148893993a0aSInaky Perez-Gonzalez if (result < 0) 148993993a0aSInaky Perez-Gonzalez goto error_configure; 149093993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 149193993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 149293993a0aSInaky Perez-Gonzalez */ 1493b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 149493993a0aSInaky Perez-Gonzalez if (c >= 0) { 149593993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 149693993a0aSInaky Perez-Gonzalez if (result) { 149793993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 149893993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 149993993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 150093993a0aSInaky Perez-Gonzalez * set other configurations. */ 150193993a0aSInaky Perez-Gonzalez } 150293993a0aSInaky Perez-Gonzalez } 150393993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 150493993a0aSInaky Perez-Gonzalez error_configure: 150593993a0aSInaky Perez-Gonzalez error_device_descriptor: 150693993a0aSInaky Perez-Gonzalez error_autoresume: 150793993a0aSInaky Perez-Gonzalez out_authorized: 150893993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); // complements locktree 150993993a0aSInaky Perez-Gonzalez return result; 151093993a0aSInaky Perez-Gonzalez } 151193993a0aSInaky Perez-Gonzalez 151293993a0aSInaky Perez-Gonzalez 15131da177e4SLinus Torvalds static int hub_port_status(struct usb_hub *hub, int port1, 15141da177e4SLinus Torvalds u16 *status, u16 *change) 15151da177e4SLinus Torvalds { 15161da177e4SLinus Torvalds int ret; 15171da177e4SLinus Torvalds 1518db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 15191da177e4SLinus Torvalds ret = get_port_status(hub->hdev, port1, &hub->status->port); 1520d25450c6SAlan Stern if (ret < 4) { 15211da177e4SLinus Torvalds dev_err (hub->intfdev, 15221da177e4SLinus Torvalds "%s failed (err = %d)\n", __FUNCTION__, ret); 1523d25450c6SAlan Stern if (ret >= 0) 1524d25450c6SAlan Stern ret = -EIO; 1525d25450c6SAlan Stern } else { 15261da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->port.wPortStatus); 15271da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->port.wPortChange); 15281da177e4SLinus Torvalds ret = 0; 15291da177e4SLinus Torvalds } 1530db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 15311da177e4SLinus Torvalds return ret; 15321da177e4SLinus Torvalds } 15331da177e4SLinus Torvalds 15340165de09SInaky Perez-Gonzalez 15350165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 15360165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 15370165de09SInaky Perez-Gonzalez { 15380165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 15390165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 15400165de09SInaky Perez-Gonzalez return 0; 15410165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 15420165de09SInaky Perez-Gonzalez return hcd->wireless; 15430165de09SInaky Perez-Gonzalez } 15440165de09SInaky Perez-Gonzalez 15450165de09SInaky Perez-Gonzalez 15461da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 15471da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 15481da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 15491da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 15501da177e4SLinus Torvalds #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) 15511da177e4SLinus Torvalds 15521da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 15531da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 15541da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 15551da177e4SLinus Torvalds #define HUB_RESET_TIMEOUT 500 15561da177e4SLinus Torvalds 15571da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 15581da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 15591da177e4SLinus Torvalds { 15601da177e4SLinus Torvalds int delay_time, ret; 15611da177e4SLinus Torvalds u16 portstatus; 15621da177e4SLinus Torvalds u16 portchange; 15631da177e4SLinus Torvalds 15641da177e4SLinus Torvalds for (delay_time = 0; 15651da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 15661da177e4SLinus Torvalds delay_time += delay) { 15671da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 15681da177e4SLinus Torvalds msleep(delay); 15691da177e4SLinus Torvalds 15701da177e4SLinus Torvalds /* read and decode port status */ 15711da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 15721da177e4SLinus Torvalds if (ret < 0) 15731da177e4SLinus Torvalds return ret; 15741da177e4SLinus Torvalds 15751da177e4SLinus Torvalds /* Device went away? */ 15761da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 15771da177e4SLinus Torvalds return -ENOTCONN; 15781da177e4SLinus Torvalds 1579dd4dd19eSAlan Stern /* bomb out completely if the connection bounced */ 15801da177e4SLinus Torvalds if ((portchange & USB_PORT_STAT_C_CONNECTION)) 1581dd4dd19eSAlan Stern return -ENOTCONN; 15821da177e4SLinus Torvalds 15831da177e4SLinus Torvalds /* if we`ve finished resetting, then break out of the loop */ 15841da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_RESET) && 15851da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_ENABLE)) { 15860165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 15870165de09SInaky Perez-Gonzalez udev->speed = USB_SPEED_VARIABLE; 15880165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 15891da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 15901da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 15911da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 15921da177e4SLinus Torvalds else 15931da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 15941da177e4SLinus Torvalds return 0; 15951da177e4SLinus Torvalds } 15961da177e4SLinus Torvalds 15971da177e4SLinus Torvalds /* switch to the long delay after two short delay failures */ 15981da177e4SLinus Torvalds if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 15991da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 16001da177e4SLinus Torvalds 16011da177e4SLinus Torvalds dev_dbg (hub->intfdev, 16021da177e4SLinus Torvalds "port %d not reset yet, waiting %dms\n", 16031da177e4SLinus Torvalds port1, delay); 16041da177e4SLinus Torvalds } 16051da177e4SLinus Torvalds 16061da177e4SLinus Torvalds return -EBUSY; 16071da177e4SLinus Torvalds } 16081da177e4SLinus Torvalds 16091da177e4SLinus Torvalds static int hub_port_reset(struct usb_hub *hub, int port1, 16101da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 16111da177e4SLinus Torvalds { 16121da177e4SLinus Torvalds int i, status; 16131da177e4SLinus Torvalds 161432fe0198SAlan Stern /* Block EHCI CF initialization during the port reset. 161532fe0198SAlan Stern * Some companion controllers don't like it when they mix. 161632fe0198SAlan Stern */ 161732fe0198SAlan Stern down_read(&ehci_cf_port_reset_rwsem); 161832fe0198SAlan Stern 16191da177e4SLinus Torvalds /* Reset the port */ 16201da177e4SLinus Torvalds for (i = 0; i < PORT_RESET_TRIES; i++) { 16211da177e4SLinus Torvalds status = set_port_feature(hub->hdev, 16221da177e4SLinus Torvalds port1, USB_PORT_FEAT_RESET); 16231da177e4SLinus Torvalds if (status) 16241da177e4SLinus Torvalds dev_err(hub->intfdev, 16251da177e4SLinus Torvalds "cannot reset port %d (err = %d)\n", 16261da177e4SLinus Torvalds port1, status); 16271da177e4SLinus Torvalds else { 16281da177e4SLinus Torvalds status = hub_port_wait_reset(hub, port1, udev, delay); 1629dd16525bSDavid Brownell if (status && status != -ENOTCONN) 16301da177e4SLinus Torvalds dev_dbg(hub->intfdev, 16311da177e4SLinus Torvalds "port_wait_reset: err = %d\n", 16321da177e4SLinus Torvalds status); 16331da177e4SLinus Torvalds } 16341da177e4SLinus Torvalds 16351da177e4SLinus Torvalds /* return on disconnect or reset */ 16361da177e4SLinus Torvalds switch (status) { 16371da177e4SLinus Torvalds case 0: 1638b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 1639b789696aSDavid Brownell msleep(10 + 40); 16404326ed0bSAlan Stern udev->devnum = 0; /* Device now at address 0 */ 16411da177e4SLinus Torvalds /* FALL THROUGH */ 16421da177e4SLinus Torvalds case -ENOTCONN: 16431da177e4SLinus Torvalds case -ENODEV: 16441da177e4SLinus Torvalds clear_port_feature(hub->hdev, 16451da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 16461da177e4SLinus Torvalds /* FIXME need disconnect() for NOTATTACHED device */ 16471da177e4SLinus Torvalds usb_set_device_state(udev, status 16481da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 16491da177e4SLinus Torvalds : USB_STATE_DEFAULT); 165032fe0198SAlan Stern goto done; 16511da177e4SLinus Torvalds } 16521da177e4SLinus Torvalds 16531da177e4SLinus Torvalds dev_dbg (hub->intfdev, 16541da177e4SLinus Torvalds "port %d not enabled, trying reset again...\n", 16551da177e4SLinus Torvalds port1); 16561da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 16571da177e4SLinus Torvalds } 16581da177e4SLinus Torvalds 16591da177e4SLinus Torvalds dev_err (hub->intfdev, 16601da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 16611da177e4SLinus Torvalds port1); 16621da177e4SLinus Torvalds 166332fe0198SAlan Stern done: 166432fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 16651da177e4SLinus Torvalds return status; 16661da177e4SLinus Torvalds } 16671da177e4SLinus Torvalds 1668d388dab7SAlan Stern #ifdef CONFIG_PM 16691da177e4SLinus Torvalds 16701da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 16711da177e4SLinus Torvalds 16721da177e4SLinus Torvalds /* 1673140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 1674624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 16755edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 16761da177e4SLinus Torvalds * 16771da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 16781da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 16791da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 1680140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 16811da177e4SLinus Torvalds * to disconnect devices while they are suspended. 16821da177e4SLinus Torvalds * 1683390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 1684390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 1685390a8c34SDavid Brownell * 1686624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 1687624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 1688624d6c07SAlan Stern * All devices below the suspended port are also suspended. 1689624d6c07SAlan Stern * 1690624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 1691624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 1692624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 1693624d6c07SAlan Stern * some cases, this wakes the USB host. 1694624d6c07SAlan Stern * 16951da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 16961da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 16971da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 16981da177e4SLinus Torvalds * 16994956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 17004956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 17014956eccdSAlan Stern * State transitions include: 17024956eccdSAlan Stern * 17034956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 17044956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 17054956eccdSAlan Stern * 17064956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 17074956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 17084956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 17094956eccdSAlan Stern * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 17104956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 17114956eccdSAlan Stern * 17124956eccdSAlan Stern * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when 17134956eccdSAlan Stern * the root hub for their bus goes into global suspend ... so we don't 17144956eccdSAlan Stern * (falsely) update the device power state to say it suspended. 17154956eccdSAlan Stern * 17161da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 17171da177e4SLinus Torvalds */ 1718140d8f68SAlan Stern int usb_port_suspend(struct usb_device *udev) 17191da177e4SLinus Torvalds { 1720624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 1721624d6c07SAlan Stern int port1 = udev->portnum; 1722624d6c07SAlan Stern int status; 17234956eccdSAlan Stern 1724624d6c07SAlan Stern // dev_dbg(hub->intfdev, "suspend port %d\n", port1); 1725624d6c07SAlan Stern 1726624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 1727624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 1728624d6c07SAlan Stern * 1729624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 1730624d6c07SAlan Stern * we don't explicitly enable it here. 1731624d6c07SAlan Stern */ 1732624d6c07SAlan Stern if (udev->do_remote_wakeup) { 1733624d6c07SAlan Stern status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 1734624d6c07SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 1735624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 1736624d6c07SAlan Stern NULL, 0, 1737624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 1738624d6c07SAlan Stern if (status) 1739624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 1740624d6c07SAlan Stern status); 1741624d6c07SAlan Stern } 1742624d6c07SAlan Stern 1743624d6c07SAlan Stern /* see 7.1.7.6 */ 1744624d6c07SAlan Stern status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); 1745624d6c07SAlan Stern if (status) { 1746624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", 1747624d6c07SAlan Stern port1, status); 1748624d6c07SAlan Stern /* paranoia: "should not happen" */ 1749624d6c07SAlan Stern (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 1750624d6c07SAlan Stern USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 1751624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 1752624d6c07SAlan Stern NULL, 0, 1753624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 1754624d6c07SAlan Stern } else { 1755624d6c07SAlan Stern /* device has up to 10 msec to fully suspend */ 1756624d6c07SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend\n", 1757624d6c07SAlan Stern udev->auto_pm ? "auto-" : ""); 1758624d6c07SAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 1759624d6c07SAlan Stern msleep(10); 1760624d6c07SAlan Stern } 17614956eccdSAlan Stern return status; 17621da177e4SLinus Torvalds } 1763f3f3253dSDavid Brownell 17641da177e4SLinus Torvalds /* 1765390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 1766390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 176754515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 17681da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 17691da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 17701da177e4SLinus Torvalds * in the tree that's rooted at this device. 177154515fe5SAlan Stern * 177254515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 177354515fe5SAlan Stern * status check is done. 17741da177e4SLinus Torvalds */ 1775140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 17761da177e4SLinus Torvalds { 177754515fe5SAlan Stern int status = 0; 17781da177e4SLinus Torvalds u16 devstatus; 17791da177e4SLinus Torvalds 17801da177e4SLinus Torvalds /* caller owns the udev device lock */ 178154515fe5SAlan Stern dev_dbg(&udev->dev, "finish %sresume\n", 178254515fe5SAlan Stern udev->reset_resume ? "reset-" : ""); 17831da177e4SLinus Torvalds 17841da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 17851da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 17861da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 17871da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 17881da177e4SLinus Torvalds */ 17891da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 17901da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 17911da177e4SLinus Torvalds : USB_STATE_ADDRESS); 17921da177e4SLinus Torvalds 179354515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 179454515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 179554515fe5SAlan Stern * operation is carried out here, after the port has been 179654515fe5SAlan Stern * resumed. 179754515fe5SAlan Stern */ 179854515fe5SAlan Stern if (udev->reset_resume) 179954515fe5SAlan Stern status = usb_reset_device(udev); 180054515fe5SAlan Stern 18011da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 18021da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 18031da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 18041da177e4SLinus Torvalds */ 180554515fe5SAlan Stern if (status == 0) { 180646dede46SAlan Stern devstatus = 0; 18071da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 1808b40b7a90SAlan Stern if (status >= 0) 180946dede46SAlan Stern status = (status > 0 ? 0 : -ENODEV); 181054515fe5SAlan Stern } 1811b40b7a90SAlan Stern 1812624d6c07SAlan Stern if (status) { 1813624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 18141da177e4SLinus Torvalds status); 1815624d6c07SAlan Stern } else if (udev->actconfig) { 18161da177e4SLinus Torvalds le16_to_cpus(&devstatus); 1817686314cfSAlan Stern if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { 18181da177e4SLinus Torvalds status = usb_control_msg(udev, 18191da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 18201da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, 18211da177e4SLinus Torvalds USB_RECIP_DEVICE, 18221da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 18231da177e4SLinus Torvalds NULL, 0, 18241da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 1825a8e7c565SAlan Stern if (status) 18261da177e4SLinus Torvalds dev_dbg(&udev->dev, "disable remote " 18271da177e4SLinus Torvalds "wakeup, status %d\n", status); 18284bf0ba86SAlan Stern } 18291da177e4SLinus Torvalds status = 0; 18301da177e4SLinus Torvalds } 18311da177e4SLinus Torvalds return status; 18321da177e4SLinus Torvalds } 18331da177e4SLinus Torvalds 1834624d6c07SAlan Stern /* 1835624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 1836624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 1837624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 1838624d6c07SAlan Stern * 1839624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 1840624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 1841624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 1842624d6c07SAlan Stern * the host and the device is the same as it was when the device 1843624d6c07SAlan Stern * suspended. 1844624d6c07SAlan Stern * 184554515fe5SAlan Stern * If CONFIG_USB_PERSIST and @udev->reset_resume are both set then this 184654515fe5SAlan Stern * routine won't check that the port is still enabled. Furthermore, 184754515fe5SAlan Stern * if @udev->reset_resume is set then finish_port_resume() above will 184854515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 184954515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 185054515fe5SAlan Stern * 185154515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 185254515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 185354515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 185454515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 185554515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 185654515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 185754515fe5SAlan Stern * made to appear as if it had not disconnected. 185854515fe5SAlan Stern * 185954515fe5SAlan Stern * This facility is inherently dangerous. Although usb_reset_device() 186054515fe5SAlan Stern * makes every effort to insure that the same device is present after the 186154515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 186254515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 186354515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 186454515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 186554515fe5SAlan Stern * new card is corrupted and the system crashes. 186654515fe5SAlan Stern * 1867624d6c07SAlan Stern * Returns 0 on success, else negative errno. 1868624d6c07SAlan Stern */ 1869624d6c07SAlan Stern int usb_port_resume(struct usb_device *udev) 18701da177e4SLinus Torvalds { 1871624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 1872624d6c07SAlan Stern int port1 = udev->portnum; 18731da177e4SLinus Torvalds int status; 1874d25450c6SAlan Stern u16 portchange, portstatus; 187554515fe5SAlan Stern unsigned mask_flags, want_flags; 1876d25450c6SAlan Stern 1877d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 1878d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 1879d25450c6SAlan Stern if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND)) 1880d25450c6SAlan Stern goto SuspendCleared; 18811da177e4SLinus Torvalds 18821da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "resume port %d\n", port1); 18831da177e4SLinus Torvalds 1884d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 1885d5cbad4bSAlan Stern 18861da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 18871da177e4SLinus Torvalds status = clear_port_feature(hub->hdev, 18881da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 18891da177e4SLinus Torvalds if (status) { 1890624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", 18911da177e4SLinus Torvalds port1, status); 18921da177e4SLinus Torvalds } else { 18931da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 1894645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 1895645daaabSAlan Stern udev->auto_pm ? "auto-" : ""); 18961da177e4SLinus Torvalds msleep(25); 18971da177e4SLinus Torvalds 18981da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 18991da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 19001da177e4SLinus Torvalds * sequence. 19011da177e4SLinus Torvalds */ 1902d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 190354515fe5SAlan Stern 1904d25450c6SAlan Stern SuspendCleared: 190554515fe5SAlan Stern if (USB_PERSIST && udev->reset_resume) 190654515fe5SAlan Stern want_flags = USB_PORT_STAT_POWER 190754515fe5SAlan Stern | USB_PORT_STAT_CONNECTION; 190854515fe5SAlan Stern else 190954515fe5SAlan Stern want_flags = USB_PORT_STAT_POWER 191054515fe5SAlan Stern | USB_PORT_STAT_CONNECTION 191154515fe5SAlan Stern | USB_PORT_STAT_ENABLE; 191254515fe5SAlan Stern mask_flags = want_flags | USB_PORT_STAT_SUSPEND; 191354515fe5SAlan Stern 191454515fe5SAlan Stern if (status < 0 || (portstatus & mask_flags) != want_flags) { 19151da177e4SLinus Torvalds dev_dbg(hub->intfdev, 19161da177e4SLinus Torvalds "port %d status %04x.%04x after resume, %d\n", 1917d25450c6SAlan Stern port1, portchange, portstatus, status); 191820307949SAlan Stern if (status >= 0) 191920307949SAlan Stern status = -ENODEV; 19201da177e4SLinus Torvalds } else { 192120307949SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 192220307949SAlan Stern clear_port_feature(hub->hdev, port1, 192320307949SAlan Stern USB_PORT_FEAT_C_SUSPEND); 19241da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 19251da177e4SLinus Torvalds msleep(10); 19261da177e4SLinus Torvalds } 19271da177e4SLinus Torvalds } 19281da177e4SLinus Torvalds 1929d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 1930d5cbad4bSAlan Stern if (!hub->hdev->parent && !hub->busy_bits[0]) 1931d5cbad4bSAlan Stern usb_enable_root_hub_irq(hub->hdev->bus); 1932d5cbad4bSAlan Stern 193354515fe5SAlan Stern if (status == 0) 193454515fe5SAlan Stern status = finish_port_resume(udev); 193554515fe5SAlan Stern if (status < 0) { 193654515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 193754515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 193854515fe5SAlan Stern } 19391da177e4SLinus Torvalds return status; 19401da177e4SLinus Torvalds } 19411da177e4SLinus Torvalds 19421da177e4SLinus Torvalds static int remote_wakeup(struct usb_device *udev) 19431da177e4SLinus Torvalds { 19441da177e4SLinus Torvalds int status = 0; 19451da177e4SLinus Torvalds 19469ad3d6ccSAlan Stern usb_lock_device(udev); 19471da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 1948645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 19491941044aSAlan Stern usb_mark_last_busy(udev); 19506b157c9bSAlan Stern status = usb_external_resume_device(udev); 1951d25450c6SAlan Stern } 19529ad3d6ccSAlan Stern usb_unlock_device(udev); 19531da177e4SLinus Torvalds return status; 19541da177e4SLinus Torvalds } 19551da177e4SLinus Torvalds 1956d388dab7SAlan Stern #else /* CONFIG_USB_SUSPEND */ 1957d388dab7SAlan Stern 1958d388dab7SAlan Stern /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ 1959d388dab7SAlan Stern 1960d388dab7SAlan Stern int usb_port_suspend(struct usb_device *udev) 1961d388dab7SAlan Stern { 1962d388dab7SAlan Stern return 0; 1963d388dab7SAlan Stern } 1964d388dab7SAlan Stern 1965d388dab7SAlan Stern int usb_port_resume(struct usb_device *udev) 1966d388dab7SAlan Stern { 196754515fe5SAlan Stern int status = 0; 196854515fe5SAlan Stern 196954515fe5SAlan Stern /* However we may need to do a reset-resume */ 197054515fe5SAlan Stern if (udev->reset_resume) { 197154515fe5SAlan Stern dev_dbg(&udev->dev, "reset-resume\n"); 197254515fe5SAlan Stern status = usb_reset_device(udev); 197354515fe5SAlan Stern } 197454515fe5SAlan Stern return status; 1975d388dab7SAlan Stern } 1976d388dab7SAlan Stern 1977d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 1978d388dab7SAlan Stern { 1979d388dab7SAlan Stern return 0; 1980d388dab7SAlan Stern } 1981d388dab7SAlan Stern 1982d388dab7SAlan Stern #endif 1983d388dab7SAlan Stern 1984db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 19851da177e4SLinus Torvalds { 19861da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 19871da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 19881da177e4SLinus Torvalds unsigned port1; 19891da177e4SLinus Torvalds 1990c9f89fa4SDavid Brownell /* fail if children aren't already suspended */ 19911da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 19921da177e4SLinus Torvalds struct usb_device *udev; 19931da177e4SLinus Torvalds 19941da177e4SLinus Torvalds udev = hdev->children [port1-1]; 19956840d255SAlan Stern if (udev && udev->can_submit) { 1996645daaabSAlan Stern if (!hdev->auto_pm) 1997645daaabSAlan Stern dev_dbg(&intf->dev, "port %d nyet suspended\n", 1998645daaabSAlan Stern port1); 1999c9f89fa4SDavid Brownell return -EBUSY; 2000c9f89fa4SDavid Brownell } 20011da177e4SLinus Torvalds } 20021da177e4SLinus Torvalds 200340f122f3SAlan Stern dev_dbg(&intf->dev, "%s\n", __FUNCTION__); 200440f122f3SAlan Stern 2005c9f89fa4SDavid Brownell /* stop khubd and related activity */ 2006c9f89fa4SDavid Brownell hub_quiesce(hub); 2007b6f6436dSAlan Stern return 0; 20081da177e4SLinus Torvalds } 20091da177e4SLinus Torvalds 20101da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 20111da177e4SLinus Torvalds { 20121da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 20131da177e4SLinus Torvalds 201440f122f3SAlan Stern dev_dbg(&intf->dev, "%s\n", __FUNCTION__); 201540f122f3SAlan Stern 2016a8e7c565SAlan Stern /* tell khubd to look for changes on this hub */ 2017f3f3253dSDavid Brownell hub_activate(hub); 20181da177e4SLinus Torvalds return 0; 20191da177e4SLinus Torvalds } 20201da177e4SLinus Torvalds 2021b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 2022f07600cfSAlan Stern { 2023b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 2024f07600cfSAlan Stern struct usb_device *hdev = hub->hdev; 2025f07600cfSAlan Stern int port1; 2026f07600cfSAlan Stern 2027b41a60ecSAlan Stern hub_power_on(hub); 2028b41a60ecSAlan Stern 2029f07600cfSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 2030f07600cfSAlan Stern struct usb_device *child = hdev->children[port1-1]; 2031f07600cfSAlan Stern 2032f07600cfSAlan Stern if (child) { 2033b41a60ecSAlan Stern 2034b41a60ecSAlan Stern /* For "USB_PERSIST"-enabled children we must 2035b41a60ecSAlan Stern * mark the child device for reset-resume and 2036b41a60ecSAlan Stern * turn off the connect-change status to prevent 2037b41a60ecSAlan Stern * khubd from disconnecting it later. 2038b41a60ecSAlan Stern */ 2039b41a60ecSAlan Stern if (USB_PERSIST && child->persist_enabled) { 2040f07600cfSAlan Stern child->reset_resume = 1; 2041f07600cfSAlan Stern clear_port_feature(hdev, port1, 2042f07600cfSAlan Stern USB_PORT_FEAT_C_CONNECTION); 2043f07600cfSAlan Stern 2044b41a60ecSAlan Stern /* Otherwise we must disconnect the child, 2045b41a60ecSAlan Stern * but as we may not lock the child device here 2046b41a60ecSAlan Stern * we have to do a "logical" disconnect. 2047f07600cfSAlan Stern */ 2048b41a60ecSAlan Stern } else { 2049b41a60ecSAlan Stern hub_port_logical_disconnect(hub, port1); 2050f07600cfSAlan Stern } 2051b41a60ecSAlan Stern } 2052b41a60ecSAlan Stern } 2053b41a60ecSAlan Stern 2054f07600cfSAlan Stern hub_activate(hub); 2055f07600cfSAlan Stern return 0; 2056f07600cfSAlan Stern } 2057f07600cfSAlan Stern 205854515fe5SAlan Stern /** 205954515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 206054515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 206154515fe5SAlan Stern * 206254515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 206354515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 206454515fe5SAlan Stern * has been reset. The routine marks @rhdev as having lost power. When 206554515fe5SAlan Stern * the hub driver is resumed it will take notice; if CONFIG_USB_PERSIST 206654515fe5SAlan Stern * is enabled then it will carry out power-session recovery, otherwise 206754515fe5SAlan Stern * it will disconnect all the child devices. 206854515fe5SAlan Stern */ 206954515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 207054515fe5SAlan Stern { 207154515fe5SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 207254515fe5SAlan Stern rhdev->reset_resume = 1; 207354515fe5SAlan Stern } 207454515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 207554515fe5SAlan Stern 2076d388dab7SAlan Stern #else /* CONFIG_PM */ 2077d388dab7SAlan Stern 2078d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 2079d388dab7SAlan Stern { 2080d388dab7SAlan Stern return 0; 2081d388dab7SAlan Stern } 2082d388dab7SAlan Stern 2083511366daSAndrew Morton #define hub_suspend NULL 2084511366daSAndrew Morton #define hub_resume NULL 2085f07600cfSAlan Stern #define hub_reset_resume NULL 2086d388dab7SAlan Stern #endif 2087d388dab7SAlan Stern 20881da177e4SLinus Torvalds 20891da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 20901da177e4SLinus Torvalds * 20911da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 20921da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 20931da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 20941da177e4SLinus Torvalds * 20951da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 20961da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 20971da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 20981da177e4SLinus Torvalds * 20991da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 21001da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 21011da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 21021da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 21031da177e4SLinus Torvalds */ 21041da177e4SLinus Torvalds 21051da177e4SLinus Torvalds #define HUB_DEBOUNCE_TIMEOUT 1500 21061da177e4SLinus Torvalds #define HUB_DEBOUNCE_STEP 25 21071da177e4SLinus Torvalds #define HUB_DEBOUNCE_STABLE 100 21081da177e4SLinus Torvalds 21091da177e4SLinus Torvalds static int hub_port_debounce(struct usb_hub *hub, int port1) 21101da177e4SLinus Torvalds { 21111da177e4SLinus Torvalds int ret; 21121da177e4SLinus Torvalds int total_time, stable_time = 0; 21131da177e4SLinus Torvalds u16 portchange, portstatus; 21141da177e4SLinus Torvalds unsigned connection = 0xffff; 21151da177e4SLinus Torvalds 21161da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 21171da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 21181da177e4SLinus Torvalds if (ret < 0) 21191da177e4SLinus Torvalds return ret; 21201da177e4SLinus Torvalds 21211da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 21221da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 21231da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 21241da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 21251da177e4SLinus Torvalds break; 21261da177e4SLinus Torvalds } else { 21271da177e4SLinus Torvalds stable_time = 0; 21281da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 21291da177e4SLinus Torvalds } 21301da177e4SLinus Torvalds 21311da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 21321da177e4SLinus Torvalds clear_port_feature(hub->hdev, port1, 21331da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 21341da177e4SLinus Torvalds } 21351da177e4SLinus Torvalds 21361da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 21371da177e4SLinus Torvalds break; 21381da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 21391da177e4SLinus Torvalds } 21401da177e4SLinus Torvalds 21411da177e4SLinus Torvalds dev_dbg (hub->intfdev, 21421da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 21431da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 21441da177e4SLinus Torvalds 21451da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 21461da177e4SLinus Torvalds return -ETIMEDOUT; 21471da177e4SLinus Torvalds return portstatus; 21481da177e4SLinus Torvalds } 21491da177e4SLinus Torvalds 21501da177e4SLinus Torvalds static void ep0_reinit(struct usb_device *udev) 21511da177e4SLinus Torvalds { 21521da177e4SLinus Torvalds usb_disable_endpoint(udev, 0 + USB_DIR_IN); 21531da177e4SLinus Torvalds usb_disable_endpoint(udev, 0 + USB_DIR_OUT); 2154bdd016baSAlan Stern usb_enable_endpoint(udev, &udev->ep0); 21551da177e4SLinus Torvalds } 21561da177e4SLinus Torvalds 21571da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 21581da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 21591da177e4SLinus Torvalds 21604326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 21611da177e4SLinus Torvalds { 21621da177e4SLinus Torvalds int retval; 21631da177e4SLinus Torvalds 21644326ed0bSAlan Stern if (devnum <= 1) 21651da177e4SLinus Torvalds return -EINVAL; 21661da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 21671da177e4SLinus Torvalds return 0; 21681da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 21691da177e4SLinus Torvalds return -EINVAL; 21701da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 21714326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 21721da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 21731da177e4SLinus Torvalds if (retval == 0) { 21744326ed0bSAlan Stern udev->devnum = devnum; /* Device now using proper address */ 21751da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 21761da177e4SLinus Torvalds ep0_reinit(udev); 21771da177e4SLinus Torvalds } 21781da177e4SLinus Torvalds return retval; 21791da177e4SLinus Torvalds } 21801da177e4SLinus Torvalds 21811da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 21821da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 21831da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 21841da177e4SLinus Torvalds * 21851da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 21861da177e4SLinus Torvalds * usb_reset_device), the caller must own the device lock. For a 21871da177e4SLinus Torvalds * newly detected device that is not accessible through any global 21881da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 21891da177e4SLinus Torvalds */ 21901da177e4SLinus Torvalds static int 21911da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 21921da177e4SLinus Torvalds int retry_counter) 21931da177e4SLinus Torvalds { 21944186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 21951da177e4SLinus Torvalds 21961da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 21971da177e4SLinus Torvalds int i, j, retval; 21981da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 21991da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 220083a07196SInaky Perez-Gonzalez char *speed, *type; 22014326ed0bSAlan Stern int devnum = udev->devnum; 22021da177e4SLinus Torvalds 22031da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 22041da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 22051da177e4SLinus Torvalds */ 22061da177e4SLinus Torvalds if (!hdev->parent) { 22071da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 22081da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 22091da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 22101da177e4SLinus Torvalds } 22111da177e4SLinus Torvalds 22121da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 22131da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 22141da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 22151da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 22161da177e4SLinus Torvalds 22174186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 22181da177e4SLinus Torvalds 22191da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 22201da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 22211da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 22221da177e4SLinus Torvalds goto fail; 22231da177e4SLinus Torvalds /* success, speed is known */ 22241da177e4SLinus Torvalds retval = -ENODEV; 22251da177e4SLinus Torvalds 22261da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 22271da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 22281da177e4SLinus Torvalds goto fail; 22291da177e4SLinus Torvalds } 22301da177e4SLinus Torvalds oldspeed = udev->speed; 22311da177e4SLinus Torvalds 22321da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 22331da177e4SLinus Torvalds * it's fixed size except for full speed devices. 22345bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 22355bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 22361da177e4SLinus Torvalds */ 22371da177e4SLinus Torvalds switch (udev->speed) { 22385bb6e0aeSInaky Perez-Gonzalez case USB_SPEED_VARIABLE: /* fixed at 512 */ 22395bb6e0aeSInaky Perez-Gonzalez udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512); 22405bb6e0aeSInaky Perez-Gonzalez break; 22411da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 22421da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); 22431da177e4SLinus Torvalds break; 22441da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 22451da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 22461da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 22471da177e4SLinus Torvalds * then correct our initial guess. 22481da177e4SLinus Torvalds */ 22491da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); 22501da177e4SLinus Torvalds break; 22511da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 22521da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8); 22531da177e4SLinus Torvalds break; 22541da177e4SLinus Torvalds default: 22551da177e4SLinus Torvalds goto fail; 22561da177e4SLinus Torvalds } 22571da177e4SLinus Torvalds 225883a07196SInaky Perez-Gonzalez type = ""; 225983a07196SInaky Perez-Gonzalez switch (udev->speed) { 22601da177e4SLinus Torvalds case USB_SPEED_LOW: speed = "low"; break; 22611da177e4SLinus Torvalds case USB_SPEED_FULL: speed = "full"; break; 22621da177e4SLinus Torvalds case USB_SPEED_HIGH: speed = "high"; break; 226383a07196SInaky Perez-Gonzalez case USB_SPEED_VARIABLE: 226483a07196SInaky Perez-Gonzalez speed = "variable"; 226583a07196SInaky Perez-Gonzalez type = "Wireless "; 226683a07196SInaky Perez-Gonzalez break; 22671da177e4SLinus Torvalds default: speed = "?"; break; 226883a07196SInaky Perez-Gonzalez } 226983a07196SInaky Perez-Gonzalez dev_info (&udev->dev, 227083a07196SInaky Perez-Gonzalez "%s %s speed %sUSB device using %s and address %d\n", 227183a07196SInaky Perez-Gonzalez (udev->config) ? "reset" : "new", speed, type, 22724326ed0bSAlan Stern udev->bus->controller->driver->name, devnum); 22731da177e4SLinus Torvalds 22741da177e4SLinus Torvalds /* Set up TT records, if needed */ 22751da177e4SLinus Torvalds if (hdev->tt) { 22761da177e4SLinus Torvalds udev->tt = hdev->tt; 22771da177e4SLinus Torvalds udev->ttport = hdev->ttport; 22781da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 22791da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 22801da177e4SLinus Torvalds udev->tt = &hub->tt; 22811da177e4SLinus Torvalds udev->ttport = port1; 22821da177e4SLinus Torvalds } 22831da177e4SLinus Torvalds 22841da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 22851da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 22861da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 22871da177e4SLinus Torvalds * Change it cautiously. 22881da177e4SLinus Torvalds * 22891da177e4SLinus Torvalds * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 22901da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 22911da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 22921da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 22931da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 22941da177e4SLinus Torvalds * value. 22951da177e4SLinus Torvalds */ 22961da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 22971da177e4SLinus Torvalds if (USE_NEW_SCHEME(retry_counter)) { 22981da177e4SLinus Torvalds struct usb_device_descriptor *buf; 22991da177e4SLinus Torvalds int r = 0; 23001da177e4SLinus Torvalds 23011da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 23021da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 23031da177e4SLinus Torvalds if (!buf) { 23041da177e4SLinus Torvalds retval = -ENOMEM; 23051da177e4SLinus Torvalds continue; 23061da177e4SLinus Torvalds } 23071da177e4SLinus Torvalds 2308b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 2309b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 2310b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 23111da177e4SLinus Torvalds */ 23121da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 23131da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 23141da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 23151da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 23161da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 23171da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 2318b89ee19aSAlan Stern USB_CTRL_GET_TIMEOUT); 23191da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 23205bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 23211da177e4SLinus Torvalds if (buf->bDescriptorType == 23221da177e4SLinus Torvalds USB_DT_DEVICE) { 23231da177e4SLinus Torvalds r = 0; 23241da177e4SLinus Torvalds break; 23251da177e4SLinus Torvalds } 23261da177e4SLinus Torvalds /* FALL THROUGH */ 23271da177e4SLinus Torvalds default: 23281da177e4SLinus Torvalds if (r == 0) 23291da177e4SLinus Torvalds r = -EPROTO; 23301da177e4SLinus Torvalds break; 23311da177e4SLinus Torvalds } 23321da177e4SLinus Torvalds if (r == 0) 23331da177e4SLinus Torvalds break; 23341da177e4SLinus Torvalds } 23351da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 23361da177e4SLinus Torvalds buf->bMaxPacketSize0; 23371da177e4SLinus Torvalds kfree(buf); 23381da177e4SLinus Torvalds 23391da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 23401da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 23411da177e4SLinus Torvalds goto fail; 23421da177e4SLinus Torvalds if (oldspeed != udev->speed) { 23431da177e4SLinus Torvalds dev_dbg(&udev->dev, 23441da177e4SLinus Torvalds "device reset changed speed!\n"); 23451da177e4SLinus Torvalds retval = -ENODEV; 23461da177e4SLinus Torvalds goto fail; 23471da177e4SLinus Torvalds } 23481da177e4SLinus Torvalds if (r) { 23491da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor " 23501da177e4SLinus Torvalds "read/%s, error %d\n", 23511da177e4SLinus Torvalds "64", r); 23521da177e4SLinus Torvalds retval = -EMSGSIZE; 23531da177e4SLinus Torvalds continue; 23541da177e4SLinus Torvalds } 23551da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 23561da177e4SLinus Torvalds } 23571da177e4SLinus Torvalds 23581da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 23594326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 23601da177e4SLinus Torvalds if (retval >= 0) 23611da177e4SLinus Torvalds break; 23621da177e4SLinus Torvalds msleep(200); 23631da177e4SLinus Torvalds } 23641da177e4SLinus Torvalds if (retval < 0) { 23651da177e4SLinus Torvalds dev_err(&udev->dev, 23661da177e4SLinus Torvalds "device not accepting address %d, error %d\n", 23674326ed0bSAlan Stern devnum, retval); 23681da177e4SLinus Torvalds goto fail; 23691da177e4SLinus Torvalds } 23701da177e4SLinus Torvalds 23711da177e4SLinus Torvalds /* cope with hardware quirkiness: 23721da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 23731da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 23741da177e4SLinus Torvalds */ 23751da177e4SLinus Torvalds msleep(10); 23761da177e4SLinus Torvalds if (USE_NEW_SCHEME(retry_counter)) 23771da177e4SLinus Torvalds break; 23781da177e4SLinus Torvalds 23791da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 23801da177e4SLinus Torvalds if (retval < 8) { 23811da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor " 23821da177e4SLinus Torvalds "read/%s, error %d\n", 23831da177e4SLinus Torvalds "8", retval); 23841da177e4SLinus Torvalds if (retval >= 0) 23851da177e4SLinus Torvalds retval = -EMSGSIZE; 23861da177e4SLinus Torvalds } else { 23871da177e4SLinus Torvalds retval = 0; 23881da177e4SLinus Torvalds break; 23891da177e4SLinus Torvalds } 23901da177e4SLinus Torvalds } 23911da177e4SLinus Torvalds if (retval) 23921da177e4SLinus Torvalds goto fail; 23931da177e4SLinus Torvalds 23945bb6e0aeSInaky Perez-Gonzalez i = udev->descriptor.bMaxPacketSize0 == 0xff? 23955bb6e0aeSInaky Perez-Gonzalez 512 : udev->descriptor.bMaxPacketSize0; 23961da177e4SLinus Torvalds if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { 23971da177e4SLinus Torvalds if (udev->speed != USB_SPEED_FULL || 23981da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 23991da177e4SLinus Torvalds dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); 24001da177e4SLinus Torvalds retval = -EMSGSIZE; 24011da177e4SLinus Torvalds goto fail; 24021da177e4SLinus Torvalds } 24031da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 24041da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 24051da177e4SLinus Torvalds ep0_reinit(udev); 24061da177e4SLinus Torvalds } 24071da177e4SLinus Torvalds 24081da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 24091da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 24101da177e4SLinus Torvalds dev_err(&udev->dev, "device descriptor read/%s, error %d\n", 24111da177e4SLinus Torvalds "all", retval); 24121da177e4SLinus Torvalds if (retval >= 0) 24131da177e4SLinus Torvalds retval = -ENOMSG; 24141da177e4SLinus Torvalds goto fail; 24151da177e4SLinus Torvalds } 24161da177e4SLinus Torvalds 24171da177e4SLinus Torvalds retval = 0; 24181da177e4SLinus Torvalds 24191da177e4SLinus Torvalds fail: 24204326ed0bSAlan Stern if (retval) { 24211da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 24224326ed0bSAlan Stern udev->devnum = devnum; /* for disconnect processing */ 24234326ed0bSAlan Stern } 24244186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 24251da177e4SLinus Torvalds return retval; 24261da177e4SLinus Torvalds } 24271da177e4SLinus Torvalds 24281da177e4SLinus Torvalds static void 24291da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 24301da177e4SLinus Torvalds { 24311da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 24321da177e4SLinus Torvalds int status; 24331da177e4SLinus Torvalds 2434e94b1766SChristoph Lameter qual = kmalloc (sizeof *qual, GFP_KERNEL); 24351da177e4SLinus Torvalds if (qual == NULL) 24361da177e4SLinus Torvalds return; 24371da177e4SLinus Torvalds 24381da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 24391da177e4SLinus Torvalds qual, sizeof *qual); 24401da177e4SLinus Torvalds if (status == sizeof *qual) { 24411da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 24421da177e4SLinus Torvalds "connect to a high speed hub\n"); 24431da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 24441da177e4SLinus Torvalds if (hub->has_indicators) { 24451da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 2446c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 24471da177e4SLinus Torvalds } 24481da177e4SLinus Torvalds } 24491da177e4SLinus Torvalds kfree(qual); 24501da177e4SLinus Torvalds } 24511da177e4SLinus Torvalds 24521da177e4SLinus Torvalds static unsigned 24531da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 24541da177e4SLinus Torvalds { 24551da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 24561da177e4SLinus Torvalds int remaining; 245755c52718SAlan Stern int port1; 24581da177e4SLinus Torvalds 245955c52718SAlan Stern if (!hub->limited_power) 24601da177e4SLinus Torvalds return 0; 24611da177e4SLinus Torvalds 246255c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 246355c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 246455c52718SAlan Stern struct usb_device *udev = hdev->children[port1 - 1]; 246555c52718SAlan Stern int delta; 24661da177e4SLinus Torvalds 24671da177e4SLinus Torvalds if (!udev) 24681da177e4SLinus Torvalds continue; 24691da177e4SLinus Torvalds 247055c52718SAlan Stern /* Unconfigured devices may not use more than 100mA, 247155c52718SAlan Stern * or 8mA for OTG ports */ 24721da177e4SLinus Torvalds if (udev->actconfig) 247355c52718SAlan Stern delta = udev->actconfig->desc.bMaxPower * 2; 247455c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 247555c52718SAlan Stern delta = 100; 24761da177e4SLinus Torvalds else 247755c52718SAlan Stern delta = 8; 247855c52718SAlan Stern if (delta > hub->mA_per_port) 247955c52718SAlan Stern dev_warn(&udev->dev, "%dmA is over %umA budget " 248055c52718SAlan Stern "for port %d!\n", 248155c52718SAlan Stern delta, hub->mA_per_port, port1); 24821da177e4SLinus Torvalds remaining -= delta; 24831da177e4SLinus Torvalds } 24841da177e4SLinus Torvalds if (remaining < 0) { 248555c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 248655c52718SAlan Stern - remaining); 24871da177e4SLinus Torvalds remaining = 0; 24881da177e4SLinus Torvalds } 24891da177e4SLinus Torvalds return remaining; 24901da177e4SLinus Torvalds } 24911da177e4SLinus Torvalds 24921da177e4SLinus Torvalds /* Handle physical or logical connection change events. 24931da177e4SLinus Torvalds * This routine is called when: 24941da177e4SLinus Torvalds * a port connection-change occurs; 24951da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 24961da177e4SLinus Torvalds * usb_reset_device() encounters changed descriptors (as from 24971da177e4SLinus Torvalds * a firmware download) 24981da177e4SLinus Torvalds * caller already locked the hub 24991da177e4SLinus Torvalds */ 25001da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 25011da177e4SLinus Torvalds u16 portstatus, u16 portchange) 25021da177e4SLinus Torvalds { 25031da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 25041da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 250590da096eSBalaji Rao struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 250674ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 25071da177e4SLinus Torvalds int status, i; 25081da177e4SLinus Torvalds 25091da177e4SLinus Torvalds dev_dbg (hub_dev, 25101da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 25111da177e4SLinus Torvalds port1, portstatus, portchange, portspeed (portstatus)); 25121da177e4SLinus Torvalds 25131da177e4SLinus Torvalds if (hub->has_indicators) { 25141da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 25151da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 25161da177e4SLinus Torvalds } 25171da177e4SLinus Torvalds 25181da177e4SLinus Torvalds /* Disconnect any existing devices under this port */ 25191da177e4SLinus Torvalds if (hdev->children[port1-1]) 25201da177e4SLinus Torvalds usb_disconnect(&hdev->children[port1-1]); 25211da177e4SLinus Torvalds clear_bit(port1, hub->change_bits); 25221da177e4SLinus Torvalds 25231da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 25241da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 25251da177e4SLinus Torvalds if (hdev->bus->is_b_host) 25261da177e4SLinus Torvalds portchange &= ~USB_PORT_STAT_C_CONNECTION; 25271da177e4SLinus Torvalds #endif 25281da177e4SLinus Torvalds 25291da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 25301da177e4SLinus Torvalds status = hub_port_debounce(hub, port1); 2531d4b7d8e8SAlan Stern if (status < 0) { 2532d4b7d8e8SAlan Stern if (printk_ratelimit()) 2533d4b7d8e8SAlan Stern dev_err (hub_dev, "connect-debounce failed, " 2534d4b7d8e8SAlan Stern "port %d disabled\n", port1); 25351da177e4SLinus Torvalds goto done; 25361da177e4SLinus Torvalds } 25371da177e4SLinus Torvalds portstatus = status; 25381da177e4SLinus Torvalds } 25391da177e4SLinus Torvalds 25401da177e4SLinus Torvalds /* Return now if nothing is connected */ 25411da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) { 25421da177e4SLinus Torvalds 25431da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 254474ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 25451da177e4SLinus Torvalds && !(portstatus & (1 << USB_PORT_FEAT_POWER))) 25461da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 25471da177e4SLinus Torvalds 25481da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 25491da177e4SLinus Torvalds goto done; 25501da177e4SLinus Torvalds return; 25511da177e4SLinus Torvalds } 25521da177e4SLinus Torvalds 25531da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 25541da177e4SLinus Torvalds struct usb_device *udev; 25551da177e4SLinus Torvalds 25561da177e4SLinus Torvalds /* reallocate for each attempt, since references 25571da177e4SLinus Torvalds * to the previous one can escape in various ways 25581da177e4SLinus Torvalds */ 25591da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 25601da177e4SLinus Torvalds if (!udev) { 25611da177e4SLinus Torvalds dev_err (hub_dev, 25621da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 25631da177e4SLinus Torvalds port1); 25641da177e4SLinus Torvalds goto done; 25651da177e4SLinus Torvalds } 25661da177e4SLinus Torvalds 25671da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 25681da177e4SLinus Torvalds udev->speed = USB_SPEED_UNKNOWN; 256955c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 2570b6956ffaSAlan Stern udev->level = hdev->level + 1; 25711da177e4SLinus Torvalds 25721da177e4SLinus Torvalds /* set the address */ 25731da177e4SLinus Torvalds choose_address(udev); 25741da177e4SLinus Torvalds if (udev->devnum <= 0) { 25751da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 25761da177e4SLinus Torvalds goto loop; 25771da177e4SLinus Torvalds } 25781da177e4SLinus Torvalds 25791da177e4SLinus Torvalds /* reset and get descriptor */ 25801da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 25811da177e4SLinus Torvalds if (status < 0) 25821da177e4SLinus Torvalds goto loop; 25831da177e4SLinus Torvalds 25841da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 25851da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 25861da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 25871da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 25881da177e4SLinus Torvalds * on the parent. 25891da177e4SLinus Torvalds */ 25901da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 259155c52718SAlan Stern && udev->bus_mA <= 100) { 25921da177e4SLinus Torvalds u16 devstat; 25931da177e4SLinus Torvalds 25941da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 25951da177e4SLinus Torvalds &devstat); 259655c52718SAlan Stern if (status < 2) { 25971da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 25981da177e4SLinus Torvalds goto loop_disable; 25991da177e4SLinus Torvalds } 260055c52718SAlan Stern le16_to_cpus(&devstat); 26011da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 26021da177e4SLinus Torvalds dev_err(&udev->dev, 26031da177e4SLinus Torvalds "can't connect bus-powered hub " 26041da177e4SLinus Torvalds "to this port\n"); 26051da177e4SLinus Torvalds if (hub->has_indicators) { 26061da177e4SLinus Torvalds hub->indicator[port1-1] = 26071da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 2608c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 26091da177e4SLinus Torvalds } 26101da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 26111da177e4SLinus Torvalds goto loop_disable; 26121da177e4SLinus Torvalds } 26131da177e4SLinus Torvalds } 26141da177e4SLinus Torvalds 26151da177e4SLinus Torvalds /* check for devices running slower than they could */ 26161da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 26171da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 26181da177e4SLinus Torvalds && highspeed_hubs != 0) 26191da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 26201da177e4SLinus Torvalds 26211da177e4SLinus Torvalds /* Store the parent's children[] pointer. At this point 26221da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 26231da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 26241da177e4SLinus Torvalds */ 26251da177e4SLinus Torvalds status = 0; 26261da177e4SLinus Torvalds 26271da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 26281da177e4SLinus Torvalds * been disconnected; we would race with the 26291da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 26301da177e4SLinus Torvalds */ 26311da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 26321da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 26331da177e4SLinus Torvalds status = -ENOTCONN; 26341da177e4SLinus Torvalds else 26351da177e4SLinus Torvalds hdev->children[port1-1] = udev; 26361da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 26371da177e4SLinus Torvalds 26381da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 26391da177e4SLinus Torvalds if (!status) { 26401da177e4SLinus Torvalds status = usb_new_device(udev); 26411da177e4SLinus Torvalds if (status) { 26421da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 26431da177e4SLinus Torvalds hdev->children[port1-1] = NULL; 26441da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 26451da177e4SLinus Torvalds } 26461da177e4SLinus Torvalds } 26471da177e4SLinus Torvalds 26481da177e4SLinus Torvalds if (status) 26491da177e4SLinus Torvalds goto loop_disable; 26501da177e4SLinus Torvalds 26511da177e4SLinus Torvalds status = hub_power_remaining(hub); 26521da177e4SLinus Torvalds if (status) 265355c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 26541da177e4SLinus Torvalds 26551da177e4SLinus Torvalds return; 26561da177e4SLinus Torvalds 26571da177e4SLinus Torvalds loop_disable: 26581da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 26591da177e4SLinus Torvalds loop: 26601da177e4SLinus Torvalds ep0_reinit(udev); 26611da177e4SLinus Torvalds release_address(udev); 26621da177e4SLinus Torvalds usb_put_dev(udev); 2663ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 26641da177e4SLinus Torvalds break; 26651da177e4SLinus Torvalds } 26661da177e4SLinus Torvalds 26671da177e4SLinus Torvalds done: 26681da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 266990da096eSBalaji Rao if (hcd->driver->relinquish_port && !hub->hdev->parent) 267090da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 26711da177e4SLinus Torvalds } 26721da177e4SLinus Torvalds 26731da177e4SLinus Torvalds static void hub_events(void) 26741da177e4SLinus Torvalds { 26751da177e4SLinus Torvalds struct list_head *tmp; 26761da177e4SLinus Torvalds struct usb_device *hdev; 26771da177e4SLinus Torvalds struct usb_interface *intf; 26781da177e4SLinus Torvalds struct usb_hub *hub; 26791da177e4SLinus Torvalds struct device *hub_dev; 26801da177e4SLinus Torvalds u16 hubstatus; 26811da177e4SLinus Torvalds u16 hubchange; 26821da177e4SLinus Torvalds u16 portstatus; 26831da177e4SLinus Torvalds u16 portchange; 26841da177e4SLinus Torvalds int i, ret; 26851da177e4SLinus Torvalds int connect_change; 26861da177e4SLinus Torvalds 26871da177e4SLinus Torvalds /* 26881da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 26891da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 26901da177e4SLinus Torvalds * safe since we delete the hub from the event list. 26911da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 26921da177e4SLinus Torvalds */ 26931da177e4SLinus Torvalds while (1) { 26941da177e4SLinus Torvalds 26951da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 26961da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 26971da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 26981da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 26991da177e4SLinus Torvalds break; 27001da177e4SLinus Torvalds } 27011da177e4SLinus Torvalds 27021da177e4SLinus Torvalds tmp = hub_event_list.next; 27031da177e4SLinus Torvalds list_del_init(tmp); 27041da177e4SLinus Torvalds 27051da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 2706e8054854SAlan Stern kref_get(&hub->kref); 2707e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 27081da177e4SLinus Torvalds 2709e8054854SAlan Stern hdev = hub->hdev; 2710e8054854SAlan Stern hub_dev = hub->intfdev; 2711e8054854SAlan Stern intf = to_usb_interface(hub_dev); 271240f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 27131da177e4SLinus Torvalds hdev->state, hub->descriptor 27141da177e4SLinus Torvalds ? hub->descriptor->bNbrPorts 27151da177e4SLinus Torvalds : 0, 27161da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 27171da177e4SLinus Torvalds (u16) hub->change_bits[0], 271840f122f3SAlan Stern (u16) hub->event_bits[0]); 27191da177e4SLinus Torvalds 27201da177e4SLinus Torvalds /* Lock the device, then check to see if we were 27211da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 272206b84e8aSAlan Stern usb_lock_device(hdev); 2723e8054854SAlan Stern if (unlikely(hub->disconnected)) 27241da177e4SLinus Torvalds goto loop; 27251da177e4SLinus Torvalds 27261da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 27271da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 27287de18d8bSAlan Stern hub->error = -ENODEV; 27297de18d8bSAlan Stern hub_pre_reset(intf); 27301da177e4SLinus Torvalds goto loop; 27311da177e4SLinus Torvalds } 27321da177e4SLinus Torvalds 273340f122f3SAlan Stern /* Autoresume */ 273440f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 273540f122f3SAlan Stern if (ret) { 273640f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 27371da177e4SLinus Torvalds goto loop; 273840f122f3SAlan Stern } 273940f122f3SAlan Stern 274040f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 274140f122f3SAlan Stern if (hub->quiescing) 274240f122f3SAlan Stern goto loop_autopm; 27431da177e4SLinus Torvalds 27441da177e4SLinus Torvalds if (hub->error) { 27451da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 27461da177e4SLinus Torvalds hub->error); 27471da177e4SLinus Torvalds 27487de18d8bSAlan Stern ret = usb_reset_composite_device(hdev, intf); 27491da177e4SLinus Torvalds if (ret) { 27501da177e4SLinus Torvalds dev_dbg (hub_dev, 27511da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 275240f122f3SAlan Stern goto loop_autopm; 27531da177e4SLinus Torvalds } 27541da177e4SLinus Torvalds 27551da177e4SLinus Torvalds hub->nerrors = 0; 27561da177e4SLinus Torvalds hub->error = 0; 27571da177e4SLinus Torvalds } 27581da177e4SLinus Torvalds 27591da177e4SLinus Torvalds /* deal with port status changes */ 27601da177e4SLinus Torvalds for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { 27611da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 27621da177e4SLinus Torvalds continue; 27631da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 27641da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 27651da177e4SLinus Torvalds !connect_change && !hub->activating) 27661da177e4SLinus Torvalds continue; 27671da177e4SLinus Torvalds 27681da177e4SLinus Torvalds ret = hub_port_status(hub, i, 27691da177e4SLinus Torvalds &portstatus, &portchange); 27701da177e4SLinus Torvalds if (ret < 0) 27711da177e4SLinus Torvalds continue; 27721da177e4SLinus Torvalds 27731da177e4SLinus Torvalds if (hub->activating && !hdev->children[i-1] && 27741da177e4SLinus Torvalds (portstatus & 27751da177e4SLinus Torvalds USB_PORT_STAT_CONNECTION)) 27761da177e4SLinus Torvalds connect_change = 1; 27771da177e4SLinus Torvalds 27781da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 27791da177e4SLinus Torvalds clear_port_feature(hdev, i, 27801da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 27811da177e4SLinus Torvalds connect_change = 1; 27821da177e4SLinus Torvalds } 27831da177e4SLinus Torvalds 27841da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 27851da177e4SLinus Torvalds if (!connect_change) 27861da177e4SLinus Torvalds dev_dbg (hub_dev, 27871da177e4SLinus Torvalds "port %d enable change, " 27881da177e4SLinus Torvalds "status %08x\n", 27891da177e4SLinus Torvalds i, portstatus); 27901da177e4SLinus Torvalds clear_port_feature(hdev, i, 27911da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 27921da177e4SLinus Torvalds 27931da177e4SLinus Torvalds /* 27941da177e4SLinus Torvalds * EM interference sometimes causes badly 27951da177e4SLinus Torvalds * shielded USB devices to be shutdown by 27961da177e4SLinus Torvalds * the hub, this hack enables them again. 27971da177e4SLinus Torvalds * Works at least with mouse driver. 27981da177e4SLinus Torvalds */ 27991da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 28001da177e4SLinus Torvalds && !connect_change 28011da177e4SLinus Torvalds && hdev->children[i-1]) { 28021da177e4SLinus Torvalds dev_err (hub_dev, 28031da177e4SLinus Torvalds "port %i " 28041da177e4SLinus Torvalds "disabled by hub (EMI?), " 28051da177e4SLinus Torvalds "re-enabling...\n", 28061da177e4SLinus Torvalds i); 28071da177e4SLinus Torvalds connect_change = 1; 28081da177e4SLinus Torvalds } 28091da177e4SLinus Torvalds } 28101da177e4SLinus Torvalds 28111da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_SUSPEND) { 28121da177e4SLinus Torvalds clear_port_feature(hdev, i, 28131da177e4SLinus Torvalds USB_PORT_FEAT_C_SUSPEND); 28141da177e4SLinus Torvalds if (hdev->children[i-1]) { 28151da177e4SLinus Torvalds ret = remote_wakeup(hdev-> 28161da177e4SLinus Torvalds children[i-1]); 28171da177e4SLinus Torvalds if (ret < 0) 28181da177e4SLinus Torvalds connect_change = 1; 28191da177e4SLinus Torvalds } else { 28201da177e4SLinus Torvalds ret = -ENODEV; 28211da177e4SLinus Torvalds hub_port_disable(hub, i, 1); 28221da177e4SLinus Torvalds } 28231da177e4SLinus Torvalds dev_dbg (hub_dev, 28241da177e4SLinus Torvalds "resume on port %d, status %d\n", 28251da177e4SLinus Torvalds i, ret); 28261da177e4SLinus Torvalds } 28271da177e4SLinus Torvalds 28281da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 28291da177e4SLinus Torvalds dev_err (hub_dev, 28301da177e4SLinus Torvalds "over-current change on port %d\n", 28311da177e4SLinus Torvalds i); 28321da177e4SLinus Torvalds clear_port_feature(hdev, i, 28331da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 28341da177e4SLinus Torvalds hub_power_on(hub); 28351da177e4SLinus Torvalds } 28361da177e4SLinus Torvalds 28371da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 28381da177e4SLinus Torvalds dev_dbg (hub_dev, 28391da177e4SLinus Torvalds "reset change on port %d\n", 28401da177e4SLinus Torvalds i); 28411da177e4SLinus Torvalds clear_port_feature(hdev, i, 28421da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 28431da177e4SLinus Torvalds } 28441da177e4SLinus Torvalds 28451da177e4SLinus Torvalds if (connect_change) 28461da177e4SLinus Torvalds hub_port_connect_change(hub, i, 28471da177e4SLinus Torvalds portstatus, portchange); 28481da177e4SLinus Torvalds } /* end for i */ 28491da177e4SLinus Torvalds 28501da177e4SLinus Torvalds /* deal with hub status changes */ 28511da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 28521da177e4SLinus Torvalds ; /* do nothing */ 28531da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 28541da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 28551da177e4SLinus Torvalds else { 28561da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 28571da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 28581da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 285955c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 286055c52718SAlan Stern /* FIXME: Is this always true? */ 286155c52718SAlan Stern hub->limited_power = 1; 2862403fae78Sjidong xiao else 2863403fae78Sjidong xiao hub->limited_power = 0; 28641da177e4SLinus Torvalds } 28651da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 28661da177e4SLinus Torvalds dev_dbg (hub_dev, "overcurrent change\n"); 28671da177e4SLinus Torvalds msleep(500); /* Cool down */ 28681da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 28691da177e4SLinus Torvalds hub_power_on(hub); 28701da177e4SLinus Torvalds } 28711da177e4SLinus Torvalds } 28721da177e4SLinus Torvalds 28731da177e4SLinus Torvalds hub->activating = 0; 28741da177e4SLinus Torvalds 2875d5926ae7SAlan Stern /* If this is a root hub, tell the HCD it's okay to 2876d5926ae7SAlan Stern * re-enable port-change interrupts now. */ 2877d5cbad4bSAlan Stern if (!hdev->parent && !hub->busy_bits[0]) 2878d5926ae7SAlan Stern usb_enable_root_hub_irq(hdev->bus); 2879d5926ae7SAlan Stern 288040f122f3SAlan Stern loop_autopm: 288140f122f3SAlan Stern /* Allow autosuspend if we're not going to run again */ 288240f122f3SAlan Stern if (list_empty(&hub->event_list)) 288340f122f3SAlan Stern usb_autopm_enable(intf); 28841da177e4SLinus Torvalds loop: 28851da177e4SLinus Torvalds usb_unlock_device(hdev); 2886e8054854SAlan Stern kref_put(&hub->kref, hub_release); 28871da177e4SLinus Torvalds 28881da177e4SLinus Torvalds } /* end while (1) */ 28891da177e4SLinus Torvalds } 28901da177e4SLinus Torvalds 28911da177e4SLinus Torvalds static int hub_thread(void *__unused) 28921da177e4SLinus Torvalds { 28933bb1af52SAlan Stern /* khubd needs to be freezable to avoid intefering with USB-PERSIST 28943bb1af52SAlan Stern * port handover. Otherwise it might see that a full-speed device 28953bb1af52SAlan Stern * was gone before the EHCI controller had handed its port over to 28963bb1af52SAlan Stern * the companion full-speed controller. 28973bb1af52SAlan Stern */ 289883144186SRafael J. Wysocki set_freezable(); 28993bb1af52SAlan Stern 29001da177e4SLinus Torvalds do { 29011da177e4SLinus Torvalds hub_events(); 2902e42837bcSRafael J. Wysocki wait_event_freezable(khubd_wait, 29039c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 29049c8d6178Sakpm@osdl.org kthread_should_stop()); 29059c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 29061da177e4SLinus Torvalds 29071da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 29089c8d6178Sakpm@osdl.org return 0; 29091da177e4SLinus Torvalds } 29101da177e4SLinus Torvalds 29111da177e4SLinus Torvalds static struct usb_device_id hub_id_table [] = { 29121da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 29131da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 29141da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 29151da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 29161da177e4SLinus Torvalds { } /* Terminating entry */ 29171da177e4SLinus Torvalds }; 29181da177e4SLinus Torvalds 29191da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 29201da177e4SLinus Torvalds 29211da177e4SLinus Torvalds static struct usb_driver hub_driver = { 29221da177e4SLinus Torvalds .name = "hub", 29231da177e4SLinus Torvalds .probe = hub_probe, 29241da177e4SLinus Torvalds .disconnect = hub_disconnect, 29251da177e4SLinus Torvalds .suspend = hub_suspend, 29261da177e4SLinus Torvalds .resume = hub_resume, 2927f07600cfSAlan Stern .reset_resume = hub_reset_resume, 29287de18d8bSAlan Stern .pre_reset = hub_pre_reset, 29297de18d8bSAlan Stern .post_reset = hub_post_reset, 29301da177e4SLinus Torvalds .ioctl = hub_ioctl, 29311da177e4SLinus Torvalds .id_table = hub_id_table, 293240f122f3SAlan Stern .supports_autosuspend = 1, 29331da177e4SLinus Torvalds }; 29341da177e4SLinus Torvalds 29351da177e4SLinus Torvalds int usb_hub_init(void) 29361da177e4SLinus Torvalds { 29371da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 29381da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 29391da177e4SLinus Torvalds usbcore_name); 29401da177e4SLinus Torvalds return -1; 29411da177e4SLinus Torvalds } 29421da177e4SLinus Torvalds 29439c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 29449c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 29451da177e4SLinus Torvalds return 0; 29461da177e4SLinus Torvalds 29471da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 29481da177e4SLinus Torvalds usb_deregister(&hub_driver); 29491da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 29501da177e4SLinus Torvalds 29511da177e4SLinus Torvalds return -1; 29521da177e4SLinus Torvalds } 29531da177e4SLinus Torvalds 29541da177e4SLinus Torvalds void usb_hub_cleanup(void) 29551da177e4SLinus Torvalds { 29569c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 29571da177e4SLinus Torvalds 29581da177e4SLinus Torvalds /* 29591da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 29601da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 29611da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 29621da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 29631da177e4SLinus Torvalds * individual hub resources. -greg 29641da177e4SLinus Torvalds */ 29651da177e4SLinus Torvalds usb_deregister(&hub_driver); 29661da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 29671da177e4SLinus Torvalds 29681da177e4SLinus Torvalds static int config_descriptors_changed(struct usb_device *udev) 29691da177e4SLinus Torvalds { 29701da177e4SLinus Torvalds unsigned index; 29711da177e4SLinus Torvalds unsigned len = 0; 29721da177e4SLinus Torvalds struct usb_config_descriptor *buf; 29731da177e4SLinus Torvalds 29741da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 29751da177e4SLinus Torvalds if (len < le16_to_cpu(udev->config[index].desc.wTotalLength)) 29761da177e4SLinus Torvalds len = le16_to_cpu(udev->config[index].desc.wTotalLength); 29771da177e4SLinus Torvalds } 29780cc1a51fSOliver Neukum buf = kmalloc(len, GFP_NOIO); 29791da177e4SLinus Torvalds if (buf == NULL) { 29801da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 29811da177e4SLinus Torvalds /* assume the worst */ 29821da177e4SLinus Torvalds return 1; 29831da177e4SLinus Torvalds } 29841da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 29851da177e4SLinus Torvalds int length; 29861da177e4SLinus Torvalds int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 29871da177e4SLinus Torvalds 29881da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 29891da177e4SLinus Torvalds old_length); 29901da177e4SLinus Torvalds if (length < old_length) { 29911da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 29921da177e4SLinus Torvalds index, length); 29931da177e4SLinus Torvalds break; 29941da177e4SLinus Torvalds } 29951da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 29961da177e4SLinus Torvalds != 0) { 29971da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 29981da177e4SLinus Torvalds index, buf->bConfigurationValue); 29991da177e4SLinus Torvalds break; 30001da177e4SLinus Torvalds } 30011da177e4SLinus Torvalds } 30021da177e4SLinus Torvalds kfree(buf); 30031da177e4SLinus Torvalds return index != udev->descriptor.bNumConfigurations; 30041da177e4SLinus Torvalds } 30051da177e4SLinus Torvalds 30061da177e4SLinus Torvalds /** 30071da177e4SLinus Torvalds * usb_reset_device - perform a USB port reset to reinitialize a device 30081da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 30091da177e4SLinus Torvalds * 301079efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 301179efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 301279efa097SAlan Stern * Use usb_reset_composite_device() instead. 30131da177e4SLinus Torvalds * 30141da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 30151da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 30161da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 30171da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 30181da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 30191da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 30201da177e4SLinus Torvalds * re-enumerated and probed all over again. 30211da177e4SLinus Torvalds * 30221da177e4SLinus Torvalds * Returns 0 if the reset succeeded, -ENODEV if the device has been 30231da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 30241da177e4SLinus Torvalds * if the reset wasn't even attempted. 30251da177e4SLinus Torvalds * 30261da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 30271da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 30281da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 30291da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 30306bc6cff5SAlan Stern * 30316bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 30326bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 30336bc6cff5SAlan Stern * holding the device lock because these tasks should always call 30346bc6cff5SAlan Stern * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. 30351da177e4SLinus Torvalds */ 30361da177e4SLinus Torvalds int usb_reset_device(struct usb_device *udev) 30371da177e4SLinus Torvalds { 30381da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 30391da177e4SLinus Torvalds struct usb_hub *parent_hub; 30401da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 304112c3da34SAlan Stern int i, ret = 0; 304212c3da34SAlan Stern int port1 = udev->portnum; 30431da177e4SLinus Torvalds 30441da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 30451da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 30461da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 30471da177e4SLinus Torvalds udev->state); 30481da177e4SLinus Torvalds return -EINVAL; 30491da177e4SLinus Torvalds } 30501da177e4SLinus Torvalds 30511da177e4SLinus Torvalds if (!parent_hdev) { 30521da177e4SLinus Torvalds /* this requires hcd-specific logic; see OHCI hc_restart() */ 30531da177e4SLinus Torvalds dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__); 30541da177e4SLinus Torvalds return -EISDIR; 30551da177e4SLinus Torvalds } 30561da177e4SLinus Torvalds parent_hub = hdev_to_hub(parent_hdev); 30571da177e4SLinus Torvalds 30581da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 30591da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 30601da177e4SLinus Torvalds 30611da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 30621da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 30631da177e4SLinus Torvalds ep0_reinit(udev); 30641da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 3065dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 30661da177e4SLinus Torvalds break; 30671da177e4SLinus Torvalds } 30681da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 3069d5cbad4bSAlan Stern if (!parent_hdev->parent && !parent_hub->busy_bits[0]) 3070d5cbad4bSAlan Stern usb_enable_root_hub_irq(parent_hdev->bus); 3071d5cbad4bSAlan Stern 30721da177e4SLinus Torvalds if (ret < 0) 30731da177e4SLinus Torvalds goto re_enumerate; 30741da177e4SLinus Torvalds 30751da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 30761da177e4SLinus Torvalds if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor) 30771da177e4SLinus Torvalds || config_descriptors_changed (udev)) { 30781da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 30791da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 30801da177e4SLinus Torvalds goto re_enumerate; 30811da177e4SLinus Torvalds } 30821da177e4SLinus Torvalds 30831da177e4SLinus Torvalds if (!udev->actconfig) 30841da177e4SLinus Torvalds goto done; 30851da177e4SLinus Torvalds 30861da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 30871da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 30881da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 30891da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 30901da177e4SLinus Torvalds if (ret < 0) { 30911da177e4SLinus Torvalds dev_err(&udev->dev, 30921da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 30931da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 30941da177e4SLinus Torvalds goto re_enumerate; 30951da177e4SLinus Torvalds } 30961da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 30971da177e4SLinus Torvalds 30981da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 30991da177e4SLinus Torvalds struct usb_interface *intf = udev->actconfig->interface[i]; 31001da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 31011da177e4SLinus Torvalds 31021da177e4SLinus Torvalds /* set_interface resets host side toggle even 31031da177e4SLinus Torvalds * for altsetting zero. the interface may have no driver. 31041da177e4SLinus Torvalds */ 31051da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 31061da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 31071da177e4SLinus Torvalds desc->bAlternateSetting); 31081da177e4SLinus Torvalds if (ret < 0) { 31091da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 31101da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 31111da177e4SLinus Torvalds desc->bInterfaceNumber, 31121da177e4SLinus Torvalds desc->bAlternateSetting, 31131da177e4SLinus Torvalds ret); 31141da177e4SLinus Torvalds goto re_enumerate; 31151da177e4SLinus Torvalds } 31161da177e4SLinus Torvalds } 31171da177e4SLinus Torvalds 31181da177e4SLinus Torvalds done: 31191da177e4SLinus Torvalds return 0; 31201da177e4SLinus Torvalds 31211da177e4SLinus Torvalds re_enumerate: 31221da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 31231da177e4SLinus Torvalds return -ENODEV; 31241da177e4SLinus Torvalds } 3125782e70c6SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(usb_reset_device); 312679efa097SAlan Stern 312779efa097SAlan Stern /** 312879efa097SAlan Stern * usb_reset_composite_device - warn interface drivers and perform a USB port reset 312979efa097SAlan Stern * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 313079efa097SAlan Stern * @iface: interface bound to the driver making the request (optional) 313179efa097SAlan Stern * 313279efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 313379efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 313479efa097SAlan Stern * the reset is over (using their post_reset method). 313579efa097SAlan Stern * 313679efa097SAlan Stern * Return value is the same as for usb_reset_device(). 313779efa097SAlan Stern * 313879efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 313979efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 314079efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 314179efa097SAlan Stern * the device using usb_lock_device_for_reset(). 314279efa097SAlan Stern */ 314379efa097SAlan Stern int usb_reset_composite_device(struct usb_device *udev, 314479efa097SAlan Stern struct usb_interface *iface) 314579efa097SAlan Stern { 314679efa097SAlan Stern int ret; 3147852c4b43SAlan Stern int i; 314879efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 314979efa097SAlan Stern 315079efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 315179efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 315279efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 315379efa097SAlan Stern udev->state); 315479efa097SAlan Stern return -EINVAL; 315579efa097SAlan Stern } 315679efa097SAlan Stern 3157645daaabSAlan Stern /* Prevent autosuspend during the reset */ 315894fcda1fSAlan Stern usb_autoresume_device(udev); 3159645daaabSAlan Stern 316079efa097SAlan Stern if (iface && iface->condition != USB_INTERFACE_BINDING) 316179efa097SAlan Stern iface = NULL; 316279efa097SAlan Stern 316379efa097SAlan Stern if (config) { 3164852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 3165852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 316679efa097SAlan Stern struct usb_driver *drv; 316779efa097SAlan Stern 3168852c4b43SAlan Stern if (cintf->dev.driver) { 316979efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 317079efa097SAlan Stern if (drv->pre_reset) 317179efa097SAlan Stern (drv->pre_reset)(cintf); 3172f07600cfSAlan Stern /* FIXME: Unbind if pre_reset returns an error or isn't defined */ 317379efa097SAlan Stern } 317479efa097SAlan Stern } 317579efa097SAlan Stern } 317679efa097SAlan Stern 317779efa097SAlan Stern ret = usb_reset_device(udev); 317879efa097SAlan Stern 317979efa097SAlan Stern if (config) { 3180852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 3181852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 318279efa097SAlan Stern struct usb_driver *drv; 318379efa097SAlan Stern 3184852c4b43SAlan Stern if (cintf->dev.driver) { 318579efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 318679efa097SAlan Stern if (drv->post_reset) 3187f07600cfSAlan Stern (drv->post_reset)(cintf); 3188f07600cfSAlan Stern /* FIXME: Unbind if post_reset returns an error or isn't defined */ 318979efa097SAlan Stern } 319079efa097SAlan Stern } 319179efa097SAlan Stern } 319279efa097SAlan Stern 319394fcda1fSAlan Stern usb_autosuspend_device(udev); 319479efa097SAlan Stern return ret; 319579efa097SAlan Stern } 3196782e70c6SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(usb_reset_composite_device); 3197