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 33f2a383e4SGreg Kroah-Hartman /* if we are in debug mode, always announce new devices */ 34f2a383e4SGreg Kroah-Hartman #ifdef DEBUG 35f2a383e4SGreg Kroah-Hartman #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES 36f2a383e4SGreg Kroah-Hartman #define CONFIG_USB_ANNOUNCE_NEW_DEVICES 37f2a383e4SGreg Kroah-Hartman #endif 38f2a383e4SGreg Kroah-Hartman #endif 39f2a383e4SGreg Kroah-Hartman 401bb5f66bSAlan Stern struct usb_hub { 411bb5f66bSAlan Stern struct device *intfdev; /* the "interface" device */ 421bb5f66bSAlan Stern struct usb_device *hdev; 43e8054854SAlan Stern struct kref kref; 441bb5f66bSAlan Stern struct urb *urb; /* for interrupt polling pipe */ 451bb5f66bSAlan Stern 461bb5f66bSAlan Stern /* buffer for urb ... with extra space in case of babble */ 471bb5f66bSAlan Stern char (*buffer)[8]; 481bb5f66bSAlan Stern union { 491bb5f66bSAlan Stern struct usb_hub_status hub; 501bb5f66bSAlan Stern struct usb_port_status port; 511bb5f66bSAlan Stern } *status; /* buffer for status reports */ 52db90e7a1SAlan Stern struct mutex status_mutex; /* for the status buffer */ 531bb5f66bSAlan Stern 541bb5f66bSAlan Stern int error; /* last reported error */ 551bb5f66bSAlan Stern int nerrors; /* track consecutive errors */ 561bb5f66bSAlan Stern 571bb5f66bSAlan Stern struct list_head event_list; /* hubs w/data or errs ready */ 581bb5f66bSAlan Stern unsigned long event_bits[1]; /* status change bitmask */ 591bb5f66bSAlan Stern unsigned long change_bits[1]; /* ports with logical connect 601bb5f66bSAlan Stern status change */ 611bb5f66bSAlan Stern unsigned long busy_bits[1]; /* ports being reset or 621bb5f66bSAlan Stern resumed */ 63253e0572SAlan Stern unsigned long removed_bits[1]; /* ports with a "removed" 64253e0572SAlan Stern device present */ 651bb5f66bSAlan Stern #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ 661bb5f66bSAlan Stern #error event_bits[] is too short! 671bb5f66bSAlan Stern #endif 681bb5f66bSAlan Stern 691bb5f66bSAlan Stern struct usb_hub_descriptor *descriptor; /* class descriptor */ 701bb5f66bSAlan Stern struct usb_tt tt; /* Transaction Translator */ 711bb5f66bSAlan Stern 721bb5f66bSAlan Stern unsigned mA_per_port; /* current for each child */ 731bb5f66bSAlan Stern 748e4ceb38SAlan Stern unsigned init_done:1; 751bb5f66bSAlan Stern unsigned limited_power:1; 761bb5f66bSAlan Stern unsigned quiescing:1; 77e8054854SAlan Stern unsigned disconnected:1; 781bb5f66bSAlan Stern 791bb5f66bSAlan Stern unsigned has_indicators:1; 801bb5f66bSAlan Stern u8 indicator[USB_MAXCHILDREN]; 816d5aefb8SDavid Howells struct delayed_work leds; 828520f380SAlan Stern struct delayed_work init_work; 837cbe5dcaSAlan Stern void **port_owners; 841bb5f66bSAlan Stern }; 851bb5f66bSAlan Stern 861bb5f66bSAlan Stern 871da177e4SLinus Torvalds /* Protect struct usb_device->state and ->children members 889ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 891da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 901da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds /* khubd's worklist and its lock */ 931da177e4SLinus Torvalds static DEFINE_SPINLOCK(hub_event_lock); 941da177e4SLinus Torvalds static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds /* Wakes up khubd */ 971da177e4SLinus Torvalds static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); 981da177e4SLinus Torvalds 999c8d6178Sakpm@osdl.org static struct task_struct *khubd_task; 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 1021da177e4SLinus Torvalds static int blinkenlights = 0; 1031da177e4SLinus Torvalds module_param (blinkenlights, bool, S_IRUGO); 1041da177e4SLinus Torvalds MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds /* 107fd7c519dSJaroslav Kysela * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about 108fd7c519dSJaroslav Kysela * 10 seconds to send reply for the initial 64-byte descriptor request. 109fd7c519dSJaroslav Kysela */ 110fd7c519dSJaroslav Kysela /* define initial 64-byte descriptor request timeout in milliseconds */ 111fd7c519dSJaroslav Kysela static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; 112fd7c519dSJaroslav Kysela module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); 113b9cef6c3SWu Fengguang MODULE_PARM_DESC(initial_descriptor_timeout, 114b9cef6c3SWu Fengguang "initial 64-byte descriptor request timeout in milliseconds " 115b9cef6c3SWu Fengguang "(default 5000 - 5.0 seconds)"); 116fd7c519dSJaroslav Kysela 117fd7c519dSJaroslav Kysela /* 1181da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 1191da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 1201da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 1211da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 1221da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 1231da177e4SLinus Torvalds * following module parameters. 1241da177e4SLinus Torvalds * 1251da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 1261da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 1271da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 1281da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 1291da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 1301da177e4SLinus Torvalds */ 1311da177e4SLinus Torvalds static int old_scheme_first = 0; 1321da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 1331da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 1341da177e4SLinus Torvalds "start with the old device initialization scheme"); 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds static int use_both_schemes = 1; 1371da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 1381da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 1391da177e4SLinus Torvalds "try the other device initialization scheme if the " 1401da177e4SLinus Torvalds "first one fails"); 1411da177e4SLinus Torvalds 14232fe0198SAlan Stern /* Mutual exclusion for EHCI CF initialization. This interferes with 14332fe0198SAlan Stern * port reset on some companion controllers. 14432fe0198SAlan Stern */ 14532fe0198SAlan Stern DECLARE_RWSEM(ehci_cf_port_reset_rwsem); 14632fe0198SAlan Stern EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); 14732fe0198SAlan Stern 148948fea37SAlan Stern #define HUB_DEBOUNCE_TIMEOUT 1500 149948fea37SAlan Stern #define HUB_DEBOUNCE_STEP 25 150948fea37SAlan Stern #define HUB_DEBOUNCE_STABLE 100 151948fea37SAlan Stern 1521da177e4SLinus Torvalds 153742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev); 154742120c6SMing Lei 1551da177e4SLinus Torvalds static inline char *portspeed(int portstatus) 1561da177e4SLinus Torvalds { 1571da177e4SLinus Torvalds if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) 1581da177e4SLinus Torvalds return "480 Mb/s"; 1591da177e4SLinus Torvalds else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) 1601da177e4SLinus Torvalds return "1.5 Mb/s"; 161d2e9b4d6SSarah Sharp else if (portstatus & (1 << USB_PORT_FEAT_SUPERSPEED)) 162d2e9b4d6SSarah Sharp return "5.0 Gb/s"; 1631da177e4SLinus Torvalds else 1641da177e4SLinus Torvalds return "12 Mb/s"; 1651da177e4SLinus Torvalds } 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 16825118084SAlan Stern static struct usb_hub *hdev_to_hub(struct usb_device *hdev) 1691da177e4SLinus Torvalds { 17025118084SAlan Stern if (!hdev || !hdev->actconfig) 17125118084SAlan Stern return NULL; 1721da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1731da177e4SLinus Torvalds } 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 1761da177e4SLinus Torvalds static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) 1771da177e4SLinus Torvalds { 1781da177e4SLinus Torvalds int i, ret; 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 1811da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 1821da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 1831da177e4SLinus Torvalds USB_DT_HUB << 8, 0, data, size, 1841da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 1851da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 1861da177e4SLinus Torvalds return ret; 1871da177e4SLinus Torvalds } 1881da177e4SLinus Torvalds return -EINVAL; 1891da177e4SLinus Torvalds } 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds /* 1921da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 1931da177e4SLinus Torvalds */ 1941da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 1951da177e4SLinus Torvalds { 1961da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1971da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 1981da177e4SLinus Torvalds } 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds /* 2011da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 2021da177e4SLinus Torvalds */ 2031da177e4SLinus Torvalds static int clear_port_feature(struct usb_device *hdev, int port1, int feature) 2041da177e4SLinus Torvalds { 2051da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 2061da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 2071da177e4SLinus Torvalds NULL, 0, 1000); 2081da177e4SLinus Torvalds } 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds /* 2111da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 2121da177e4SLinus Torvalds */ 2131da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 2141da177e4SLinus Torvalds { 2151da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 2161da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 2171da177e4SLinus Torvalds NULL, 0, 1000); 2181da177e4SLinus Torvalds } 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds /* 2211da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 2221da177e4SLinus Torvalds * for info about using port indicators 2231da177e4SLinus Torvalds */ 2241da177e4SLinus Torvalds static void set_port_led( 2251da177e4SLinus Torvalds struct usb_hub *hub, 2261da177e4SLinus Torvalds int port1, 2271da177e4SLinus Torvalds int selector 2281da177e4SLinus Torvalds ) 2291da177e4SLinus Torvalds { 2301da177e4SLinus Torvalds int status = set_port_feature(hub->hdev, (selector << 8) | port1, 2311da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 2321da177e4SLinus Torvalds if (status < 0) 2331da177e4SLinus Torvalds dev_dbg (hub->intfdev, 2341da177e4SLinus Torvalds "port %d indicator %s status %d\n", 2351da177e4SLinus Torvalds port1, 2361da177e4SLinus Torvalds ({ char *s; switch (selector) { 2371da177e4SLinus Torvalds case HUB_LED_AMBER: s = "amber"; break; 2381da177e4SLinus Torvalds case HUB_LED_GREEN: s = "green"; break; 2391da177e4SLinus Torvalds case HUB_LED_OFF: s = "off"; break; 2401da177e4SLinus Torvalds case HUB_LED_AUTO: s = "auto"; break; 2411da177e4SLinus Torvalds default: s = "??"; break; 2421da177e4SLinus Torvalds }; s; }), 2431da177e4SLinus Torvalds status); 2441da177e4SLinus Torvalds } 2451da177e4SLinus Torvalds 2461da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 2471da177e4SLinus Torvalds 248c4028958SDavid Howells static void led_work (struct work_struct *work) 2491da177e4SLinus Torvalds { 250c4028958SDavid Howells struct usb_hub *hub = 251c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 2521da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 2531da177e4SLinus Torvalds unsigned i; 2541da177e4SLinus Torvalds unsigned changed = 0; 2551da177e4SLinus Torvalds int cursor = -1; 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 2581da177e4SLinus Torvalds return; 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds for (i = 0; i < hub->descriptor->bNbrPorts; i++) { 2611da177e4SLinus Torvalds unsigned selector, mode; 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds /* 30%-50% duty cycle */ 2641da177e4SLinus Torvalds 2651da177e4SLinus Torvalds switch (hub->indicator[i]) { 2661da177e4SLinus Torvalds /* cycle marker */ 2671da177e4SLinus Torvalds case INDICATOR_CYCLE: 2681da177e4SLinus Torvalds cursor = i; 2691da177e4SLinus Torvalds selector = HUB_LED_AUTO; 2701da177e4SLinus Torvalds mode = INDICATOR_AUTO; 2711da177e4SLinus Torvalds break; 2721da177e4SLinus Torvalds /* blinking green = sw attention */ 2731da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 2741da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2751da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 2761da177e4SLinus Torvalds break; 2771da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 2781da177e4SLinus Torvalds selector = HUB_LED_OFF; 2791da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 2801da177e4SLinus Torvalds break; 2811da177e4SLinus Torvalds /* blinking amber = hw attention */ 2821da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 2831da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2841da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 2851da177e4SLinus Torvalds break; 2861da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 2871da177e4SLinus Torvalds selector = HUB_LED_OFF; 2881da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 2891da177e4SLinus Torvalds break; 2901da177e4SLinus Torvalds /* blink green/amber = reserved */ 2911da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 2921da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2931da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 2941da177e4SLinus Torvalds break; 2951da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 2961da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2971da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 2981da177e4SLinus Torvalds break; 2991da177e4SLinus Torvalds default: 3001da177e4SLinus Torvalds continue; 3011da177e4SLinus Torvalds } 3021da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 3031da177e4SLinus Torvalds changed = 1; 3041da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 3051da177e4SLinus Torvalds hub->indicator[i] = mode; 3061da177e4SLinus Torvalds } 3071da177e4SLinus Torvalds if (!changed && blinkenlights) { 3081da177e4SLinus Torvalds cursor++; 3091da177e4SLinus Torvalds cursor %= hub->descriptor->bNbrPorts; 3101da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 3111da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 3121da177e4SLinus Torvalds changed++; 3131da177e4SLinus Torvalds } 3141da177e4SLinus Torvalds if (changed) 3151da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 3161da177e4SLinus Torvalds } 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 3191da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 3201da177e4SLinus Torvalds #define USB_STS_RETRIES 5 3211da177e4SLinus Torvalds 3221da177e4SLinus Torvalds /* 3231da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 3241da177e4SLinus Torvalds */ 3251da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 3261da177e4SLinus Torvalds struct usb_hub_status *data) 3271da177e4SLinus Torvalds { 3281da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 3291da177e4SLinus Torvalds 3301da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 3311da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3321da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 3331da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 3341da177e4SLinus Torvalds } 3351da177e4SLinus Torvalds return status; 3361da177e4SLinus Torvalds } 3371da177e4SLinus Torvalds 3381da177e4SLinus Torvalds /* 3391da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 3401da177e4SLinus Torvalds */ 3411da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 3421da177e4SLinus Torvalds struct usb_port_status *data) 3431da177e4SLinus Torvalds { 3441da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 3471da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3481da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 3491da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 3501da177e4SLinus Torvalds } 3511da177e4SLinus Torvalds return status; 3521da177e4SLinus Torvalds } 3531da177e4SLinus Torvalds 3543eb14915SAlan Stern static int hub_port_status(struct usb_hub *hub, int port1, 3553eb14915SAlan Stern u16 *status, u16 *change) 3563eb14915SAlan Stern { 3573eb14915SAlan Stern int ret; 3583eb14915SAlan Stern 3593eb14915SAlan Stern mutex_lock(&hub->status_mutex); 3603eb14915SAlan Stern ret = get_port_status(hub->hdev, port1, &hub->status->port); 3613eb14915SAlan Stern if (ret < 4) { 3623eb14915SAlan Stern dev_err(hub->intfdev, 3633eb14915SAlan Stern "%s failed (err = %d)\n", __func__, ret); 3643eb14915SAlan Stern if (ret >= 0) 3653eb14915SAlan Stern ret = -EIO; 3663eb14915SAlan Stern } else { 3673eb14915SAlan Stern *status = le16_to_cpu(hub->status->port.wPortStatus); 3683eb14915SAlan Stern *change = le16_to_cpu(hub->status->port.wPortChange); 3693eb14915SAlan Stern ret = 0; 3703eb14915SAlan Stern } 3713eb14915SAlan Stern mutex_unlock(&hub->status_mutex); 3723eb14915SAlan Stern return ret; 3733eb14915SAlan Stern } 3743eb14915SAlan Stern 3751da177e4SLinus Torvalds static void kick_khubd(struct usb_hub *hub) 3761da177e4SLinus Torvalds { 3771da177e4SLinus Torvalds unsigned long flags; 3781da177e4SLinus Torvalds 3791da177e4SLinus Torvalds spin_lock_irqsave(&hub_event_lock, flags); 3802e2c5eeaSRoel Kluin if (!hub->disconnected && list_empty(&hub->event_list)) { 3811da177e4SLinus Torvalds list_add_tail(&hub->event_list, &hub_event_list); 3828e4ceb38SAlan Stern 3838e4ceb38SAlan Stern /* Suppress autosuspend until khubd runs */ 3848e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 3858e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 3861da177e4SLinus Torvalds wake_up(&khubd_wait); 3871da177e4SLinus Torvalds } 3881da177e4SLinus Torvalds spin_unlock_irqrestore(&hub_event_lock, flags); 3891da177e4SLinus Torvalds } 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds void usb_kick_khubd(struct usb_device *hdev) 3921da177e4SLinus Torvalds { 39325118084SAlan Stern struct usb_hub *hub = hdev_to_hub(hdev); 39425118084SAlan Stern 39525118084SAlan Stern if (hub) 39625118084SAlan Stern kick_khubd(hub); 3971da177e4SLinus Torvalds } 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 4017d12e780SDavid Howells static void hub_irq(struct urb *urb) 4021da177e4SLinus Torvalds { 403ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 404e015268dSAlan Stern int status = urb->status; 40571d2718fSRoel Kluin unsigned i; 4061da177e4SLinus Torvalds unsigned long bits; 4071da177e4SLinus Torvalds 408e015268dSAlan Stern switch (status) { 4091da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 4101da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 4111da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 4121da177e4SLinus Torvalds return; 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds default: /* presumably an error */ 4151da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 416e015268dSAlan Stern dev_dbg (hub->intfdev, "transfer --> %d\n", status); 4171da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 4181da177e4SLinus Torvalds goto resubmit; 419e015268dSAlan Stern hub->error = status; 4201da177e4SLinus Torvalds /* FALL THROUGH */ 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds /* let khubd handle things */ 4231da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 4241da177e4SLinus Torvalds bits = 0; 4251da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 4261da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 4271da177e4SLinus Torvalds << (i*8); 4281da177e4SLinus Torvalds hub->event_bits[0] = bits; 4291da177e4SLinus Torvalds break; 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds hub->nerrors = 0; 4331da177e4SLinus Torvalds 4341da177e4SLinus Torvalds /* Something happened, let khubd figure it out */ 4351da177e4SLinus Torvalds kick_khubd(hub); 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds resubmit: 4381da177e4SLinus Torvalds if (hub->quiescing) 4391da177e4SLinus Torvalds return; 4401da177e4SLinus Torvalds 4411da177e4SLinus Torvalds if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 4421da177e4SLinus Torvalds && status != -ENODEV && status != -EPERM) 4431da177e4SLinus Torvalds dev_err (hub->intfdev, "resubmit --> %d\n", status); 4441da177e4SLinus Torvalds } 4451da177e4SLinus Torvalds 4461da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 4471da177e4SLinus Torvalds static inline int 4481da177e4SLinus Torvalds hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) 4491da177e4SLinus Torvalds { 450c2f6595fSAlan Stern return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4511da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 4521da177e4SLinus Torvalds tt, NULL, 0, 1000); 4531da177e4SLinus Torvalds } 4541da177e4SLinus Torvalds 4551da177e4SLinus Torvalds /* 4561da177e4SLinus Torvalds * enumeration blocks khubd for a long time. we use keventd instead, since 4571da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 4581da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 4591da177e4SLinus Torvalds * both can talk to the same hub concurrently. 4601da177e4SLinus Torvalds */ 461cb88a1b8SAlan Stern static void hub_tt_work(struct work_struct *work) 4621da177e4SLinus Torvalds { 463c4028958SDavid Howells struct usb_hub *hub = 464cb88a1b8SAlan Stern container_of(work, struct usb_hub, tt.clear_work); 4651da177e4SLinus Torvalds unsigned long flags; 46655e5fdfaSMark Lord int limit = 100; 4671da177e4SLinus Torvalds 4681da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 46955e5fdfaSMark Lord while (--limit && !list_empty (&hub->tt.clear_list)) { 470d0f830d3SH Hartley Sweeten struct list_head *next; 4711da177e4SLinus Torvalds struct usb_tt_clear *clear; 4721da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 473cb88a1b8SAlan Stern const struct hc_driver *drv; 4741da177e4SLinus Torvalds int status; 4751da177e4SLinus Torvalds 476d0f830d3SH Hartley Sweeten next = hub->tt.clear_list.next; 477d0f830d3SH Hartley Sweeten clear = list_entry (next, struct usb_tt_clear, clear_list); 4781da177e4SLinus Torvalds list_del (&clear->clear_list); 4791da177e4SLinus Torvalds 4801da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 4811da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 4821da177e4SLinus Torvalds status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 4831da177e4SLinus Torvalds if (status) 4841da177e4SLinus Torvalds dev_err (&hdev->dev, 4851da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 4861da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 487cb88a1b8SAlan Stern 488cb88a1b8SAlan Stern /* Tell the HCD, even if the operation failed */ 489cb88a1b8SAlan Stern drv = clear->hcd->driver; 490cb88a1b8SAlan Stern if (drv->clear_tt_buffer_complete) 491cb88a1b8SAlan Stern (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); 492cb88a1b8SAlan Stern 4931da177e4SLinus Torvalds kfree(clear); 494cb88a1b8SAlan Stern spin_lock_irqsave(&hub->tt.lock, flags); 4951da177e4SLinus Torvalds } 4961da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 4971da177e4SLinus Torvalds } 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds /** 500cb88a1b8SAlan Stern * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub 501cb88a1b8SAlan Stern * @urb: an URB associated with the failed or incomplete split transaction 5021da177e4SLinus Torvalds * 5031da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 5041da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 5051da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 5061da177e4SLinus Torvalds * interrupt context. 5071da177e4SLinus Torvalds * 5081da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 5091da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 5101da177e4SLinus Torvalds */ 511cb88a1b8SAlan Stern int usb_hub_clear_tt_buffer(struct urb *urb) 5121da177e4SLinus Torvalds { 513cb88a1b8SAlan Stern struct usb_device *udev = urb->dev; 514cb88a1b8SAlan Stern int pipe = urb->pipe; 5151da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 5161da177e4SLinus Torvalds unsigned long flags; 5171da177e4SLinus Torvalds struct usb_tt_clear *clear; 5181da177e4SLinus Torvalds 5191da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 5201da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 5211da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 5221da177e4SLinus Torvalds */ 52354e6ecb2SChristoph Lameter if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { 5241da177e4SLinus Torvalds dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 5251da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 526cb88a1b8SAlan Stern return -ENOMEM; 5271da177e4SLinus Torvalds } 5281da177e4SLinus Torvalds 5291da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 5301da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 5311da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 5321da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 5331da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol (pipe) 5341da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 5351da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 5361da177e4SLinus Torvalds if (usb_pipein (pipe)) 5371da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 5381da177e4SLinus Torvalds 539cb88a1b8SAlan Stern /* info for completion callback */ 540cb88a1b8SAlan Stern clear->hcd = bus_to_hcd(udev->bus); 541cb88a1b8SAlan Stern clear->ep = urb->ep; 542cb88a1b8SAlan Stern 5431da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 5441da177e4SLinus Torvalds spin_lock_irqsave (&tt->lock, flags); 5451da177e4SLinus Torvalds list_add_tail (&clear->clear_list, &tt->clear_list); 546cb88a1b8SAlan Stern schedule_work(&tt->clear_work); 5471da177e4SLinus Torvalds spin_unlock_irqrestore (&tt->lock, flags); 548cb88a1b8SAlan Stern return 0; 5491da177e4SLinus Torvalds } 550cb88a1b8SAlan Stern EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); 5511da177e4SLinus Torvalds 5528520f380SAlan Stern /* If do_delay is false, return the number of milliseconds the caller 5538520f380SAlan Stern * needs to delay. 5548520f380SAlan Stern */ 5558520f380SAlan Stern static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) 5561da177e4SLinus Torvalds { 5571da177e4SLinus Torvalds int port1; 558b789696aSDavid Brownell unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 5598520f380SAlan Stern unsigned delay; 5604489a571SAlan Stern u16 wHubCharacteristics = 5614489a571SAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 5621da177e4SLinus Torvalds 5634489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 5644489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 5654489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 5664489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 5674489a571SAlan Stern * unless we send these messages to the hub. 5684489a571SAlan Stern */ 5694489a571SAlan Stern if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) 5701da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 5714489a571SAlan Stern else 5724489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 5734489a571SAlan Stern "non-switchable hub\n"); 5741da177e4SLinus Torvalds for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) 5754489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 5761da177e4SLinus Torvalds 577b789696aSDavid Brownell /* Wait at least 100 msec for power to become stable */ 5788520f380SAlan Stern delay = max(pgood_delay, (unsigned) 100); 5798520f380SAlan Stern if (do_delay) 5808520f380SAlan Stern msleep(delay); 5818520f380SAlan Stern return delay; 5821da177e4SLinus Torvalds } 5831da177e4SLinus Torvalds 5841da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 5851da177e4SLinus Torvalds u16 *status, u16 *change) 5861da177e4SLinus Torvalds { 5871da177e4SLinus Torvalds int ret; 5881da177e4SLinus Torvalds 589db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 5901da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 5911da177e4SLinus Torvalds if (ret < 0) 5921da177e4SLinus Torvalds dev_err (hub->intfdev, 593441b62c1SHarvey Harrison "%s failed (err = %d)\n", __func__, ret); 5941da177e4SLinus Torvalds else { 5951da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 5961da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 5971da177e4SLinus Torvalds ret = 0; 5981da177e4SLinus Torvalds } 599db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 6001da177e4SLinus Torvalds return ret; 6011da177e4SLinus Torvalds } 6021da177e4SLinus Torvalds 6038b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 6048b28c752SAlan Stern { 6058b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 6060458d5b4SAlan Stern int ret = 0; 6078b28c752SAlan Stern 6080458d5b4SAlan Stern if (hdev->children[port1-1] && set_state) 6098b28c752SAlan Stern usb_set_device_state(hdev->children[port1-1], 6108b28c752SAlan Stern USB_STATE_NOTATTACHED); 6110458d5b4SAlan Stern if (!hub->error) 6128b28c752SAlan Stern ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); 6138b28c752SAlan Stern if (ret) 6148b28c752SAlan Stern dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 6158b28c752SAlan Stern port1, ret); 6168b28c752SAlan Stern return ret; 6178b28c752SAlan Stern } 6188b28c752SAlan Stern 6190458d5b4SAlan Stern /* 6200458d5b4SAlan Stern * Disable a port and mark a logical connnect-change event, so that some 6210458d5b4SAlan Stern * time later khubd will disconnect() any existing usb_device on the port 6220458d5b4SAlan Stern * and will re-enumerate if there actually is a device attached. 6230458d5b4SAlan Stern */ 6240458d5b4SAlan Stern static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 6257d069b7dSAlan Stern { 6260458d5b4SAlan Stern dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 6270458d5b4SAlan Stern hub_port_disable(hub, port1, 1); 6280458d5b4SAlan Stern 6290458d5b4SAlan Stern /* FIXME let caller ask to power down the port: 6300458d5b4SAlan Stern * - some devices won't enumerate without a VBUS power cycle 6310458d5b4SAlan Stern * - SRP saves power that way 6320458d5b4SAlan Stern * - ... new call, TBD ... 6330458d5b4SAlan Stern * That's easy if this hub can switch power per-port, and 6340458d5b4SAlan Stern * khubd reactivates the port later (timer, SRP, etc). 6350458d5b4SAlan Stern * Powerdown must be optional, because of reset/DFU. 6360458d5b4SAlan Stern */ 6370458d5b4SAlan Stern 6380458d5b4SAlan Stern set_bit(port1, hub->change_bits); 6390458d5b4SAlan Stern kick_khubd(hub); 6400458d5b4SAlan Stern } 6410458d5b4SAlan Stern 642253e0572SAlan Stern /** 643253e0572SAlan Stern * usb_remove_device - disable a device's port on its parent hub 644253e0572SAlan Stern * @udev: device to be disabled and removed 645253e0572SAlan Stern * Context: @udev locked, must be able to sleep. 646253e0572SAlan Stern * 647253e0572SAlan Stern * After @udev's port has been disabled, khubd is notified and it will 648253e0572SAlan Stern * see that the device has been disconnected. When the device is 649253e0572SAlan Stern * physically unplugged and something is plugged in, the events will 650253e0572SAlan Stern * be received and processed normally. 651253e0572SAlan Stern */ 652253e0572SAlan Stern int usb_remove_device(struct usb_device *udev) 653253e0572SAlan Stern { 654253e0572SAlan Stern struct usb_hub *hub; 655253e0572SAlan Stern struct usb_interface *intf; 656253e0572SAlan Stern 657253e0572SAlan Stern if (!udev->parent) /* Can't remove a root hub */ 658253e0572SAlan Stern return -EINVAL; 659253e0572SAlan Stern hub = hdev_to_hub(udev->parent); 660253e0572SAlan Stern intf = to_usb_interface(hub->intfdev); 661253e0572SAlan Stern 662253e0572SAlan Stern usb_autopm_get_interface(intf); 663253e0572SAlan Stern set_bit(udev->portnum, hub->removed_bits); 664253e0572SAlan Stern hub_port_logical_disconnect(hub, udev->portnum); 665253e0572SAlan Stern usb_autopm_put_interface(intf); 666253e0572SAlan Stern return 0; 667253e0572SAlan Stern } 668253e0572SAlan Stern 6696ee0b270SAlan Stern enum hub_activation_type { 6708e4ceb38SAlan Stern HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ 6718520f380SAlan Stern HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, 6726ee0b270SAlan Stern }; 6735e6effaeSAlan Stern 6748520f380SAlan Stern static void hub_init_func2(struct work_struct *ws); 6758520f380SAlan Stern static void hub_init_func3(struct work_struct *ws); 6768520f380SAlan Stern 677f2835219SAlan Stern static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) 6785e6effaeSAlan Stern { 6795e6effaeSAlan Stern struct usb_device *hdev = hub->hdev; 6805e6effaeSAlan Stern int port1; 681f2835219SAlan Stern int status; 682948fea37SAlan Stern bool need_debounce_delay = false; 6838520f380SAlan Stern unsigned delay; 6848520f380SAlan Stern 6858520f380SAlan Stern /* Continue a partial initialization */ 6868520f380SAlan Stern if (type == HUB_INIT2) 6878520f380SAlan Stern goto init2; 6888520f380SAlan Stern if (type == HUB_INIT3) 6898520f380SAlan Stern goto init3; 6905e6effaeSAlan Stern 691f2835219SAlan Stern /* After a resume, port power should still be on. 692f2835219SAlan Stern * For any other type of activation, turn it on. 693f2835219SAlan Stern */ 6948520f380SAlan Stern if (type != HUB_RESUME) { 6958520f380SAlan Stern 6968520f380SAlan Stern /* Speed up system boot by using a delayed_work for the 6978520f380SAlan Stern * hub's initial power-up delays. This is pretty awkward 6988520f380SAlan Stern * and the implementation looks like a home-brewed sort of 6998520f380SAlan Stern * setjmp/longjmp, but it saves at least 100 ms for each 7008520f380SAlan Stern * root hub (assuming usbcore is compiled into the kernel 7018520f380SAlan Stern * rather than as a module). It adds up. 7028520f380SAlan Stern * 7038520f380SAlan Stern * This can't be done for HUB_RESUME or HUB_RESET_RESUME 7048520f380SAlan Stern * because for those activation types the ports have to be 7058520f380SAlan Stern * operational when we return. In theory this could be done 7068520f380SAlan Stern * for HUB_POST_RESET, but it's easier not to. 7078520f380SAlan Stern */ 7088520f380SAlan Stern if (type == HUB_INIT) { 7098520f380SAlan Stern delay = hub_power_on(hub, false); 7108520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); 7118520f380SAlan Stern schedule_delayed_work(&hub->init_work, 7128520f380SAlan Stern msecs_to_jiffies(delay)); 71361fbeba1SAlan Stern 71461fbeba1SAlan Stern /* Suppress autosuspend until init is done */ 7158e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 7168e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 7178520f380SAlan Stern return; /* Continues at init2: below */ 7188520f380SAlan Stern } else { 7198520f380SAlan Stern hub_power_on(hub, true); 7208520f380SAlan Stern } 7218520f380SAlan Stern } 7228520f380SAlan Stern init2: 723f2835219SAlan Stern 7246ee0b270SAlan Stern /* Check each port and set hub->change_bits to let khubd know 7256ee0b270SAlan Stern * which ports need attention. 7265e6effaeSAlan Stern */ 7275e6effaeSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 7285e6effaeSAlan Stern struct usb_device *udev = hdev->children[port1-1]; 7295e6effaeSAlan Stern u16 portstatus, portchange; 7305e6effaeSAlan Stern 7316ee0b270SAlan Stern portstatus = portchange = 0; 7326ee0b270SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 7336ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 7346ee0b270SAlan Stern dev_dbg(hub->intfdev, 7356ee0b270SAlan Stern "port %d: status %04x change %04x\n", 7366ee0b270SAlan Stern port1, portstatus, portchange); 7375e6effaeSAlan Stern 7386ee0b270SAlan Stern /* After anything other than HUB_RESUME (i.e., initialization 7396ee0b270SAlan Stern * or any sort of reset), every port should be disabled. 7406ee0b270SAlan Stern * Unconnected ports should likewise be disabled (paranoia), 7416ee0b270SAlan Stern * and so should ports for which we have no usb_device. 7425e6effaeSAlan Stern */ 7436ee0b270SAlan Stern if ((portstatus & USB_PORT_STAT_ENABLE) && ( 7446ee0b270SAlan Stern type != HUB_RESUME || 7456ee0b270SAlan Stern !(portstatus & USB_PORT_STAT_CONNECTION) || 7466ee0b270SAlan Stern !udev || 7476ee0b270SAlan Stern udev->state == USB_STATE_NOTATTACHED)) { 7486ee0b270SAlan Stern clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); 7496ee0b270SAlan Stern portstatus &= ~USB_PORT_STAT_ENABLE; 7506ee0b270SAlan Stern } 7516ee0b270SAlan Stern 752948fea37SAlan Stern /* Clear status-change flags; we'll debounce later */ 753948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) { 754948fea37SAlan Stern need_debounce_delay = true; 755948fea37SAlan Stern clear_port_feature(hub->hdev, port1, 756948fea37SAlan Stern USB_PORT_FEAT_C_CONNECTION); 757948fea37SAlan Stern } 758948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) { 759948fea37SAlan Stern need_debounce_delay = true; 760948fea37SAlan Stern clear_port_feature(hub->hdev, port1, 761948fea37SAlan Stern USB_PORT_FEAT_C_ENABLE); 762948fea37SAlan Stern } 763948fea37SAlan Stern 764253e0572SAlan Stern /* We can forget about a "removed" device when there's a 765253e0572SAlan Stern * physical disconnect or the connect status changes. 766253e0572SAlan Stern */ 767253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 768253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 769253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 770253e0572SAlan Stern 7716ee0b270SAlan Stern if (!udev || udev->state == USB_STATE_NOTATTACHED) { 7726ee0b270SAlan Stern /* Tell khubd to disconnect the device or 7736ee0b270SAlan Stern * check for a new connection 7746ee0b270SAlan Stern */ 7756ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 7766ee0b270SAlan Stern set_bit(port1, hub->change_bits); 7776ee0b270SAlan Stern 7786ee0b270SAlan Stern } else if (portstatus & USB_PORT_STAT_ENABLE) { 7796ee0b270SAlan Stern /* The power session apparently survived the resume. 7806ee0b270SAlan Stern * If there was an overcurrent or suspend change 7816ee0b270SAlan Stern * (i.e., remote wakeup request), have khubd 7826ee0b270SAlan Stern * take care of it. 7836ee0b270SAlan Stern */ 7846ee0b270SAlan Stern if (portchange) 7856ee0b270SAlan Stern set_bit(port1, hub->change_bits); 7866ee0b270SAlan Stern 7876ee0b270SAlan Stern } else if (udev->persist_enabled) { 7886ee0b270SAlan Stern #ifdef CONFIG_PM 7895e6effaeSAlan Stern udev->reset_resume = 1; 7906ee0b270SAlan Stern #endif 7918808f00cSAlan Stern set_bit(port1, hub->change_bits); 7928808f00cSAlan Stern 7936ee0b270SAlan Stern } else { 7946ee0b270SAlan Stern /* The power session is gone; tell khubd */ 7956ee0b270SAlan Stern usb_set_device_state(udev, USB_STATE_NOTATTACHED); 7966ee0b270SAlan Stern set_bit(port1, hub->change_bits); 7975e6effaeSAlan Stern } 7985e6effaeSAlan Stern } 7995e6effaeSAlan Stern 800948fea37SAlan Stern /* If no port-status-change flags were set, we don't need any 801948fea37SAlan Stern * debouncing. If flags were set we can try to debounce the 802948fea37SAlan Stern * ports all at once right now, instead of letting khubd do them 803948fea37SAlan Stern * one at a time later on. 804948fea37SAlan Stern * 805948fea37SAlan Stern * If any port-status changes do occur during this delay, khubd 806948fea37SAlan Stern * will see them later and handle them normally. 807948fea37SAlan Stern */ 8088520f380SAlan Stern if (need_debounce_delay) { 8098520f380SAlan Stern delay = HUB_DEBOUNCE_STABLE; 810f2835219SAlan Stern 8118520f380SAlan Stern /* Don't do a long sleep inside a workqueue routine */ 8128520f380SAlan Stern if (type == HUB_INIT2) { 8138520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); 8148520f380SAlan Stern schedule_delayed_work(&hub->init_work, 8158520f380SAlan Stern msecs_to_jiffies(delay)); 8168520f380SAlan Stern return; /* Continues at init3: below */ 8178520f380SAlan Stern } else { 8188520f380SAlan Stern msleep(delay); 8198520f380SAlan Stern } 8208520f380SAlan Stern } 8218520f380SAlan Stern init3: 822f2835219SAlan Stern hub->quiescing = 0; 8238e4ceb38SAlan Stern hub->init_done = 1; 824f2835219SAlan Stern 825f2835219SAlan Stern status = usb_submit_urb(hub->urb, GFP_NOIO); 826f2835219SAlan Stern if (status < 0) 827f2835219SAlan Stern dev_err(hub->intfdev, "activate --> %d\n", status); 828f2835219SAlan Stern if (hub->has_indicators && blinkenlights) 829f2835219SAlan Stern schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 830f2835219SAlan Stern 831f2835219SAlan Stern /* Scan all ports that need attention */ 832f2835219SAlan Stern kick_khubd(hub); 8338e4ceb38SAlan Stern 8348e4ceb38SAlan Stern /* Allow autosuspend if it was suppressed */ 8358e4ceb38SAlan Stern if (type <= HUB_INIT3) 8368e4ceb38SAlan Stern usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); 8375e6effaeSAlan Stern } 8385e6effaeSAlan Stern 8398520f380SAlan Stern /* Implement the continuations for the delays above */ 8408520f380SAlan Stern static void hub_init_func2(struct work_struct *ws) 8418520f380SAlan Stern { 8428520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 8438520f380SAlan Stern 8448520f380SAlan Stern hub_activate(hub, HUB_INIT2); 8458520f380SAlan Stern } 8468520f380SAlan Stern 8478520f380SAlan Stern static void hub_init_func3(struct work_struct *ws) 8488520f380SAlan Stern { 8498520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 8508520f380SAlan Stern 8518520f380SAlan Stern hub_activate(hub, HUB_INIT3); 8528520f380SAlan Stern } 8538520f380SAlan Stern 8544330354fSAlan Stern enum hub_quiescing_type { 8554330354fSAlan Stern HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND 8564330354fSAlan Stern }; 8574330354fSAlan Stern 8584330354fSAlan Stern static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) 8594330354fSAlan Stern { 8604330354fSAlan Stern struct usb_device *hdev = hub->hdev; 8614330354fSAlan Stern int i; 8624330354fSAlan Stern 8638520f380SAlan Stern cancel_delayed_work_sync(&hub->init_work); 8648e4ceb38SAlan Stern if (!hub->init_done) { 8658e4ceb38SAlan Stern hub->init_done = 1; 8668e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend( 8678e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 8688e4ceb38SAlan Stern } 8698520f380SAlan Stern 8704330354fSAlan Stern /* khubd and related activity won't re-trigger */ 8714330354fSAlan Stern hub->quiescing = 1; 8724330354fSAlan Stern 8734330354fSAlan Stern if (type != HUB_SUSPEND) { 8744330354fSAlan Stern /* Disconnect all the children */ 8754330354fSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 8764330354fSAlan Stern if (hdev->children[i]) 8774330354fSAlan Stern usb_disconnect(&hdev->children[i]); 8784330354fSAlan Stern } 8794330354fSAlan Stern } 8804330354fSAlan Stern 8814330354fSAlan Stern /* Stop khubd and related activity */ 8824330354fSAlan Stern usb_kill_urb(hub->urb); 8834330354fSAlan Stern if (hub->has_indicators) 8844330354fSAlan Stern cancel_delayed_work_sync(&hub->leds); 8854330354fSAlan Stern if (hub->tt.hub) 886cb88a1b8SAlan Stern cancel_work_sync(&hub->tt.clear_work); 8874330354fSAlan Stern } 8884330354fSAlan Stern 8893eb14915SAlan Stern /* caller has locked the hub device */ 8903eb14915SAlan Stern static int hub_pre_reset(struct usb_interface *intf) 8913eb14915SAlan Stern { 8923eb14915SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 8933eb14915SAlan Stern 8944330354fSAlan Stern hub_quiesce(hub, HUB_PRE_RESET); 895f07600cfSAlan Stern return 0; 8967d069b7dSAlan Stern } 8977d069b7dSAlan Stern 8987d069b7dSAlan Stern /* caller has locked the hub device */ 899f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 9007d069b7dSAlan Stern { 9017de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 9027de18d8bSAlan Stern 903f2835219SAlan Stern hub_activate(hub, HUB_POST_RESET); 904f07600cfSAlan Stern return 0; 9057d069b7dSAlan Stern } 9067d069b7dSAlan Stern 9071da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 9081da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 9091da177e4SLinus Torvalds { 910b356b7c7SSarah Sharp struct usb_hcd *hcd; 9111da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 9121da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 9131da177e4SLinus Torvalds u16 hubstatus, hubchange; 91474ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 9151da177e4SLinus Torvalds unsigned int pipe; 9161da177e4SLinus Torvalds int maxp, ret; 9177cbe5dcaSAlan Stern char *message = "out of memory"; 9181da177e4SLinus Torvalds 919d697cddaSAlan Stern hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); 9201da177e4SLinus Torvalds if (!hub->buffer) { 9211da177e4SLinus Torvalds ret = -ENOMEM; 9221da177e4SLinus Torvalds goto fail; 9231da177e4SLinus Torvalds } 9241da177e4SLinus Torvalds 9251da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 9261da177e4SLinus Torvalds if (!hub->status) { 9271da177e4SLinus Torvalds ret = -ENOMEM; 9281da177e4SLinus Torvalds goto fail; 9291da177e4SLinus Torvalds } 930db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 9311da177e4SLinus Torvalds 9321da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 9331da177e4SLinus Torvalds if (!hub->descriptor) { 9341da177e4SLinus Torvalds ret = -ENOMEM; 9351da177e4SLinus Torvalds goto fail; 9361da177e4SLinus Torvalds } 9371da177e4SLinus Torvalds 9381da177e4SLinus Torvalds /* Request the entire hub descriptor. 9391da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 9401da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 9411da177e4SLinus Torvalds */ 9421da177e4SLinus Torvalds ret = get_hub_descriptor(hdev, hub->descriptor, 9431da177e4SLinus Torvalds sizeof(*hub->descriptor)); 9441da177e4SLinus Torvalds if (ret < 0) { 9451da177e4SLinus Torvalds message = "can't read hub descriptor"; 9461da177e4SLinus Torvalds goto fail; 9471da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 9481da177e4SLinus Torvalds message = "hub has too many ports!"; 9491da177e4SLinus Torvalds ret = -ENODEV; 9501da177e4SLinus Torvalds goto fail; 9511da177e4SLinus Torvalds } 9521da177e4SLinus Torvalds 9531da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 9541da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 9551da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 9561da177e4SLinus Torvalds 9577cbe5dcaSAlan Stern hub->port_owners = kzalloc(hdev->maxchild * sizeof(void *), GFP_KERNEL); 9587cbe5dcaSAlan Stern if (!hub->port_owners) { 9597cbe5dcaSAlan Stern ret = -ENOMEM; 9607cbe5dcaSAlan Stern goto fail; 9617cbe5dcaSAlan Stern } 9627cbe5dcaSAlan Stern 96374ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 9641da177e4SLinus Torvalds 96574ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_COMPOUND) { 9661da177e4SLinus Torvalds int i; 9671da177e4SLinus Torvalds char portstr [USB_MAXCHILDREN + 1]; 9681da177e4SLinus Torvalds 9691da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 9701da177e4SLinus Torvalds portstr[i] = hub->descriptor->DeviceRemovable 9711da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 9721da177e4SLinus Torvalds ? 'F' : 'R'; 9731da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 9741da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 9751da177e4SLinus Torvalds } else 9761da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 9771da177e4SLinus Torvalds 97874ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 9791da177e4SLinus Torvalds case 0x00: 9801da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 9811da177e4SLinus Torvalds break; 9821da177e4SLinus Torvalds case 0x01: 9831da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 9841da177e4SLinus Torvalds break; 9851da177e4SLinus Torvalds case 0x02: 9861da177e4SLinus Torvalds case 0x03: 9871da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 9881da177e4SLinus Torvalds break; 9891da177e4SLinus Torvalds } 9901da177e4SLinus Torvalds 99174ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 9921da177e4SLinus Torvalds case 0x00: 9931da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 9941da177e4SLinus Torvalds break; 9951da177e4SLinus Torvalds case 0x08: 9961da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 9971da177e4SLinus Torvalds break; 9981da177e4SLinus Torvalds case 0x10: 9991da177e4SLinus Torvalds case 0x18: 10001da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 10011da177e4SLinus Torvalds break; 10021da177e4SLinus Torvalds } 10031da177e4SLinus Torvalds 10041da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 10051da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 1006cb88a1b8SAlan Stern INIT_WORK(&hub->tt.clear_work, hub_tt_work); 10071da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 10081da177e4SLinus Torvalds case 0: 10091da177e4SLinus Torvalds break; 10101da177e4SLinus Torvalds case 1: 10111da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 10121da177e4SLinus Torvalds hub->tt.hub = hdev; 10131da177e4SLinus Torvalds break; 10141da177e4SLinus Torvalds case 2: 10151da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 10161da177e4SLinus Torvalds if (ret == 0) { 10171da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 10181da177e4SLinus Torvalds hub->tt.multi = 1; 10191da177e4SLinus Torvalds } else 10201da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 10211da177e4SLinus Torvalds ret); 10221da177e4SLinus Torvalds hub->tt.hub = hdev; 10231da177e4SLinus Torvalds break; 1024d2e9b4d6SSarah Sharp case 3: 1025d2e9b4d6SSarah Sharp /* USB 3.0 hubs don't have a TT */ 1026d2e9b4d6SSarah Sharp break; 10271da177e4SLinus Torvalds default: 10281da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 10291da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 10301da177e4SLinus Torvalds break; 10311da177e4SLinus Torvalds } 10321da177e4SLinus Torvalds 1033e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 103474ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 1035e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 1036e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 1037e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 1038e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1039e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1040e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 1041e09711aeSdavid-b@pacbell.net } 10421da177e4SLinus Torvalds break; 1043e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 1044e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 1045e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1046e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1047e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 10481da177e4SLinus Torvalds break; 1049e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 1050e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 1051e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1052e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1053e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 10541da177e4SLinus Torvalds break; 1055e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 1056e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 1057e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1058e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1059e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 10601da177e4SLinus Torvalds break; 10611da177e4SLinus Torvalds } 10621da177e4SLinus Torvalds 10631da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 106474ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 10651da177e4SLinus Torvalds hub->has_indicators = 1; 10661da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 10671da177e4SLinus Torvalds } 10681da177e4SLinus Torvalds 10691da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 10701da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 10711da177e4SLinus Torvalds 10721da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 10731da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 10741da177e4SLinus Torvalds */ 10751da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 107655c52718SAlan Stern if (ret < 2) { 10771da177e4SLinus Torvalds message = "can't get hub status"; 10781da177e4SLinus Torvalds goto fail; 10791da177e4SLinus Torvalds } 10807d35b929SAlan Stern le16_to_cpus(&hubstatus); 10817d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 108255c52718SAlan Stern if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) 108355c52718SAlan Stern hub->mA_per_port = 500; 108455c52718SAlan Stern else { 108555c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 108655c52718SAlan Stern hub->limited_power = 1; 108755c52718SAlan Stern } 10887d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 10891da177e4SLinus Torvalds dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 10901da177e4SLinus Torvalds hub->descriptor->bHubContrCurrent); 109155c52718SAlan Stern hub->limited_power = 1; 109255c52718SAlan Stern if (hdev->maxchild > 0) { 109355c52718SAlan Stern int remaining = hdev->bus_mA - 109455c52718SAlan Stern hub->descriptor->bHubContrCurrent; 10951da177e4SLinus Torvalds 109655c52718SAlan Stern if (remaining < hdev->maxchild * 100) 109755c52718SAlan Stern dev_warn(hub_dev, 109855c52718SAlan Stern "insufficient power available " 109955c52718SAlan Stern "to use all downstream ports\n"); 110055c52718SAlan Stern hub->mA_per_port = 100; /* 7.2.1.1 */ 110155c52718SAlan Stern } 110255c52718SAlan Stern } else { /* Self-powered external hub */ 110355c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 110455c52718SAlan Stern * provide less current per port? */ 110555c52718SAlan Stern hub->mA_per_port = 500; 110655c52718SAlan Stern } 110755c52718SAlan Stern if (hub->mA_per_port < 500) 110855c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 110955c52718SAlan Stern hub->mA_per_port); 11101da177e4SLinus Torvalds 1111b356b7c7SSarah Sharp /* Update the HCD's internal representation of this hub before khubd 1112b356b7c7SSarah Sharp * starts getting port status changes for devices under the hub. 1113b356b7c7SSarah Sharp */ 1114b356b7c7SSarah Sharp hcd = bus_to_hcd(hdev->bus); 1115b356b7c7SSarah Sharp if (hcd->driver->update_hub_device) { 1116b356b7c7SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1117b356b7c7SSarah Sharp &hub->tt, GFP_KERNEL); 1118b356b7c7SSarah Sharp if (ret < 0) { 1119b356b7c7SSarah Sharp message = "can't update HCD hub info"; 1120b356b7c7SSarah Sharp goto fail; 1121b356b7c7SSarah Sharp } 1122b356b7c7SSarah Sharp } 1123b356b7c7SSarah Sharp 11241da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 11251da177e4SLinus Torvalds if (ret < 0) { 11261da177e4SLinus Torvalds message = "can't get hub status"; 11271da177e4SLinus Torvalds goto fail; 11281da177e4SLinus Torvalds } 11291da177e4SLinus Torvalds 11301da177e4SLinus Torvalds /* local power status reports aren't always correct */ 11311da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 11321da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 11331da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 11341da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 11351da177e4SLinus Torvalds 113674ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 11371da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 11381da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 11391da177e4SLinus Torvalds 114088fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 114188fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 114288fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 114388fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 114488fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 114588fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 11461da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 11471da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 11481da177e4SLinus Torvalds 11491da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 11501da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 11511da177e4SLinus Torvalds 11521da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 11531da177e4SLinus Torvalds if (!hub->urb) { 11541da177e4SLinus Torvalds ret = -ENOMEM; 11551da177e4SLinus Torvalds goto fail; 11561da177e4SLinus Torvalds } 11571da177e4SLinus Torvalds 11581da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 11591da177e4SLinus Torvalds hub, endpoint->bInterval); 11601da177e4SLinus Torvalds 11611da177e4SLinus Torvalds /* maybe cycle the hub leds */ 11621da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 11631da177e4SLinus Torvalds hub->indicator [0] = INDICATOR_CYCLE; 11641da177e4SLinus Torvalds 1165f2835219SAlan Stern hub_activate(hub, HUB_INIT); 11661da177e4SLinus Torvalds return 0; 11671da177e4SLinus Torvalds 11681da177e4SLinus Torvalds fail: 11691da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 11701da177e4SLinus Torvalds message, ret); 11711da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 11721da177e4SLinus Torvalds return ret; 11731da177e4SLinus Torvalds } 11741da177e4SLinus Torvalds 1175e8054854SAlan Stern static void hub_release(struct kref *kref) 1176e8054854SAlan Stern { 1177e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 1178e8054854SAlan Stern 1179e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 1180e8054854SAlan Stern kfree(hub); 1181e8054854SAlan Stern } 1182e8054854SAlan Stern 11831da177e4SLinus Torvalds static unsigned highspeed_hubs; 11841da177e4SLinus Torvalds 11851da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 11861da177e4SLinus Torvalds { 11871da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 1188e8054854SAlan Stern 1189e8054854SAlan Stern /* Take the hub off the event list and don't let it be added again */ 1190e8054854SAlan Stern spin_lock_irq(&hub_event_lock); 11918e4ceb38SAlan Stern if (!list_empty(&hub->event_list)) { 1192e8054854SAlan Stern list_del_init(&hub->event_list); 11938e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 11948e4ceb38SAlan Stern } 1195e8054854SAlan Stern hub->disconnected = 1; 1196e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 11971da177e4SLinus Torvalds 11987de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 11997de18d8bSAlan Stern hub->error = 0; 12004330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 12017de18d8bSAlan Stern 12028b28c752SAlan Stern usb_set_intfdata (intf, NULL); 12037cbe5dcaSAlan Stern hub->hdev->maxchild = 0; 12041da177e4SLinus Torvalds 1205e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 12061da177e4SLinus Torvalds highspeed_hubs--; 12071da177e4SLinus Torvalds 12081da177e4SLinus Torvalds usb_free_urb(hub->urb); 12097cbe5dcaSAlan Stern kfree(hub->port_owners); 12101da177e4SLinus Torvalds kfree(hub->descriptor); 12111da177e4SLinus Torvalds kfree(hub->status); 1212d697cddaSAlan Stern kfree(hub->buffer); 12131da177e4SLinus Torvalds 1214e8054854SAlan Stern kref_put(&hub->kref, hub_release); 12151da177e4SLinus Torvalds } 12161da177e4SLinus Torvalds 12171da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 12181da177e4SLinus Torvalds { 12191da177e4SLinus Torvalds struct usb_host_interface *desc; 12201da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 12211da177e4SLinus Torvalds struct usb_device *hdev; 12221da177e4SLinus Torvalds struct usb_hub *hub; 12231da177e4SLinus Torvalds 12241da177e4SLinus Torvalds desc = intf->cur_altsetting; 12251da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 12261da177e4SLinus Torvalds 122738f3ad5eSFelipe Balbi if (hdev->level == MAX_TOPO_LEVEL) { 1228b9cef6c3SWu Fengguang dev_err(&intf->dev, 1229b9cef6c3SWu Fengguang "Unsupported bus topology: hub nested too deep\n"); 123038f3ad5eSFelipe Balbi return -E2BIG; 123138f3ad5eSFelipe Balbi } 123238f3ad5eSFelipe Balbi 123389ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 123489ccbdc9SDavid Brownell if (hdev->parent) { 123589ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 123689ccbdc9SDavid Brownell return -ENODEV; 123789ccbdc9SDavid Brownell } 123889ccbdc9SDavid Brownell #endif 123989ccbdc9SDavid Brownell 12401da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 12411da177e4SLinus Torvalds /* specs is not defined, but it works */ 12421da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 12431da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 12441da177e4SLinus Torvalds descriptor_error: 12451da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 12461da177e4SLinus Torvalds return -EIO; 12471da177e4SLinus Torvalds } 12481da177e4SLinus Torvalds 12491da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 12501da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 12511da177e4SLinus Torvalds goto descriptor_error; 12521da177e4SLinus Torvalds 12531da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 12541da177e4SLinus Torvalds 1255fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 1256fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 12571da177e4SLinus Torvalds goto descriptor_error; 12581da177e4SLinus Torvalds 12591da177e4SLinus Torvalds /* We found a hub */ 12601da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 12611da177e4SLinus Torvalds 12620a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 12631da177e4SLinus Torvalds if (!hub) { 12641da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 12651da177e4SLinus Torvalds return -ENOMEM; 12661da177e4SLinus Torvalds } 12671da177e4SLinus Torvalds 1268e8054854SAlan Stern kref_init(&hub->kref); 12691da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 12701da177e4SLinus Torvalds hub->intfdev = &intf->dev; 12711da177e4SLinus Torvalds hub->hdev = hdev; 1272c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 12738520f380SAlan Stern INIT_DELAYED_WORK(&hub->init_work, NULL); 1274e8054854SAlan Stern usb_get_intf(intf); 12751da177e4SLinus Torvalds 12761da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 127740f122f3SAlan Stern intf->needs_remote_wakeup = 1; 12781da177e4SLinus Torvalds 12791da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 12801da177e4SLinus Torvalds highspeed_hubs++; 12811da177e4SLinus Torvalds 12821da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 12831da177e4SLinus Torvalds return 0; 12841da177e4SLinus Torvalds 12851da177e4SLinus Torvalds hub_disconnect (intf); 12861da177e4SLinus Torvalds return -ENODEV; 12871da177e4SLinus Torvalds } 12881da177e4SLinus Torvalds 12891da177e4SLinus Torvalds static int 12901da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 12911da177e4SLinus Torvalds { 12921da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 12931da177e4SLinus Torvalds 12941da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 12951da177e4SLinus Torvalds switch (code) { 12961da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 12971da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 12981da177e4SLinus Torvalds int i; 12991da177e4SLinus Torvalds 13001da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 13011da177e4SLinus Torvalds if (hdev->devnum <= 0) 13021da177e4SLinus Torvalds info->nports = 0; 13031da177e4SLinus Torvalds else { 13041da177e4SLinus Torvalds info->nports = hdev->maxchild; 13051da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 13061da177e4SLinus Torvalds if (hdev->children[i] == NULL) 13071da177e4SLinus Torvalds info->port[i] = 0; 13081da177e4SLinus Torvalds else 13091da177e4SLinus Torvalds info->port[i] = 13101da177e4SLinus Torvalds hdev->children[i]->devnum; 13111da177e4SLinus Torvalds } 13121da177e4SLinus Torvalds } 13131da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 13141da177e4SLinus Torvalds 13151da177e4SLinus Torvalds return info->nports + 1; 13161da177e4SLinus Torvalds } 13171da177e4SLinus Torvalds 13181da177e4SLinus Torvalds default: 13191da177e4SLinus Torvalds return -ENOSYS; 13201da177e4SLinus Torvalds } 13211da177e4SLinus Torvalds } 13221da177e4SLinus Torvalds 13237cbe5dcaSAlan Stern /* 13247cbe5dcaSAlan Stern * Allow user programs to claim ports on a hub. When a device is attached 13257cbe5dcaSAlan Stern * to one of these "claimed" ports, the program will "own" the device. 13267cbe5dcaSAlan Stern */ 13277cbe5dcaSAlan Stern static int find_port_owner(struct usb_device *hdev, unsigned port1, 13287cbe5dcaSAlan Stern void ***ppowner) 13297cbe5dcaSAlan Stern { 13307cbe5dcaSAlan Stern if (hdev->state == USB_STATE_NOTATTACHED) 13317cbe5dcaSAlan Stern return -ENODEV; 13327cbe5dcaSAlan Stern if (port1 == 0 || port1 > hdev->maxchild) 13337cbe5dcaSAlan Stern return -EINVAL; 13347cbe5dcaSAlan Stern 13357cbe5dcaSAlan Stern /* This assumes that devices not managed by the hub driver 13367cbe5dcaSAlan Stern * will always have maxchild equal to 0. 13377cbe5dcaSAlan Stern */ 13387cbe5dcaSAlan Stern *ppowner = &(hdev_to_hub(hdev)->port_owners[port1 - 1]); 13397cbe5dcaSAlan Stern return 0; 13407cbe5dcaSAlan Stern } 13417cbe5dcaSAlan Stern 13427cbe5dcaSAlan Stern /* In the following three functions, the caller must hold hdev's lock */ 13437cbe5dcaSAlan Stern int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, void *owner) 13447cbe5dcaSAlan Stern { 13457cbe5dcaSAlan Stern int rc; 13467cbe5dcaSAlan Stern void **powner; 13477cbe5dcaSAlan Stern 13487cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 13497cbe5dcaSAlan Stern if (rc) 13507cbe5dcaSAlan Stern return rc; 13517cbe5dcaSAlan Stern if (*powner) 13527cbe5dcaSAlan Stern return -EBUSY; 13537cbe5dcaSAlan Stern *powner = owner; 13547cbe5dcaSAlan Stern return rc; 13557cbe5dcaSAlan Stern } 13567cbe5dcaSAlan Stern 13577cbe5dcaSAlan Stern int usb_hub_release_port(struct usb_device *hdev, unsigned port1, void *owner) 13587cbe5dcaSAlan Stern { 13597cbe5dcaSAlan Stern int rc; 13607cbe5dcaSAlan Stern void **powner; 13617cbe5dcaSAlan Stern 13627cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 13637cbe5dcaSAlan Stern if (rc) 13647cbe5dcaSAlan Stern return rc; 13657cbe5dcaSAlan Stern if (*powner != owner) 13667cbe5dcaSAlan Stern return -ENOENT; 13677cbe5dcaSAlan Stern *powner = NULL; 13687cbe5dcaSAlan Stern return rc; 13697cbe5dcaSAlan Stern } 13707cbe5dcaSAlan Stern 13717cbe5dcaSAlan Stern void usb_hub_release_all_ports(struct usb_device *hdev, void *owner) 13727cbe5dcaSAlan Stern { 13737cbe5dcaSAlan Stern int n; 13747cbe5dcaSAlan Stern void **powner; 13757cbe5dcaSAlan Stern 13767cbe5dcaSAlan Stern n = find_port_owner(hdev, 1, &powner); 13777cbe5dcaSAlan Stern if (n == 0) { 13787cbe5dcaSAlan Stern for (; n < hdev->maxchild; (++n, ++powner)) { 13797cbe5dcaSAlan Stern if (*powner == owner) 13807cbe5dcaSAlan Stern *powner = NULL; 13817cbe5dcaSAlan Stern } 13827cbe5dcaSAlan Stern } 13837cbe5dcaSAlan Stern } 13847cbe5dcaSAlan Stern 13857cbe5dcaSAlan Stern /* The caller must hold udev's lock */ 13867cbe5dcaSAlan Stern bool usb_device_is_owned(struct usb_device *udev) 13877cbe5dcaSAlan Stern { 13887cbe5dcaSAlan Stern struct usb_hub *hub; 13897cbe5dcaSAlan Stern 13907cbe5dcaSAlan Stern if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) 13917cbe5dcaSAlan Stern return false; 13927cbe5dcaSAlan Stern hub = hdev_to_hub(udev->parent); 13937cbe5dcaSAlan Stern return !!hub->port_owners[udev->portnum - 1]; 13947cbe5dcaSAlan Stern } 13957cbe5dcaSAlan Stern 13961da177e4SLinus Torvalds 13971da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 13981da177e4SLinus Torvalds { 13991da177e4SLinus Torvalds int i; 14001da177e4SLinus Torvalds 14011da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 14021da177e4SLinus Torvalds if (udev->children[i]) 14031da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev->children[i]); 14041da177e4SLinus Torvalds } 140515123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED) { 1406ee49fb5dSAlan Stern udev->discon_suspended = 1; 140715123006SSarah Sharp udev->active_duration -= jiffies; 140815123006SSarah Sharp } 14091da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 14101da177e4SLinus Torvalds } 14111da177e4SLinus Torvalds 14121da177e4SLinus Torvalds /** 14131da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 14141da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 14151da177e4SLinus Torvalds * @new_state: new state value to be stored 14161da177e4SLinus Torvalds * 14171da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 14181da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 14191da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 14201da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 14211da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 14221da177e4SLinus Torvalds * all changes to any device's state must be protected by the 14231da177e4SLinus Torvalds * device_state_lock spinlock. 14241da177e4SLinus Torvalds * 14251da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 14261da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 14271da177e4SLinus Torvalds * 14281da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 14291da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 14301da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 14311da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 14321da177e4SLinus Torvalds */ 14331da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 14341da177e4SLinus Torvalds enum usb_device_state new_state) 14351da177e4SLinus Torvalds { 14361da177e4SLinus Torvalds unsigned long flags; 14371da177e4SLinus Torvalds 14381da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 14391da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 14401da177e4SLinus Torvalds ; /* do nothing */ 1441b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1442fb669cc0SDavid Brownell 1443fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1444fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1445fb669cc0SDavid Brownell */ 1446fb669cc0SDavid Brownell if (udev->parent) { 1447645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1448645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1449645daaabSAlan Stern ; /* No change to wakeup settings */ 1450645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 1451b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 1452b94dc6b5SDavid Brownell (udev->actconfig->desc.bmAttributes 1453b94dc6b5SDavid Brownell & USB_CONFIG_ATT_WAKEUP)); 1454645daaabSAlan Stern else 1455b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 0); 1456fb669cc0SDavid Brownell } 145715123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED && 145815123006SSarah Sharp new_state != USB_STATE_SUSPENDED) 145915123006SSarah Sharp udev->active_duration -= jiffies; 146015123006SSarah Sharp else if (new_state == USB_STATE_SUSPENDED && 146115123006SSarah Sharp udev->state != USB_STATE_SUSPENDED) 146215123006SSarah Sharp udev->active_duration += jiffies; 1463645daaabSAlan Stern udev->state = new_state; 1464b94dc6b5SDavid Brownell } else 14651da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 14661da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 14671da177e4SLinus Torvalds } 14686da9c990SDavid Vrabel EXPORT_SYMBOL_GPL(usb_set_device_state); 14691da177e4SLinus Torvalds 14708af548dcSInaky Perez-Gonzalez /* 14718af548dcSInaky Perez-Gonzalez * WUSB devices are simple: they have no hubs behind, so the mapping 14728af548dcSInaky Perez-Gonzalez * device <-> virtual port number becomes 1:1. Why? to simplify the 14738af548dcSInaky Perez-Gonzalez * life of the device connection logic in 14748af548dcSInaky Perez-Gonzalez * drivers/usb/wusbcore/devconnect.c. When we do the initial secret 14758af548dcSInaky Perez-Gonzalez * handshake we need to assign a temporary address in the unauthorized 14768af548dcSInaky Perez-Gonzalez * space. For simplicity we use the first virtual port number found to 14778af548dcSInaky Perez-Gonzalez * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] 14788af548dcSInaky Perez-Gonzalez * and that becomes it's address [X < 128] or its unauthorized address 14798af548dcSInaky Perez-Gonzalez * [X | 0x80]. 14808af548dcSInaky Perez-Gonzalez * 14818af548dcSInaky Perez-Gonzalez * We add 1 as an offset to the one-based USB-stack port number 14828af548dcSInaky Perez-Gonzalez * (zero-based wusb virtual port index) for two reasons: (a) dev addr 14838af548dcSInaky Perez-Gonzalez * 0 is reserved by USB for default address; (b) Linux's USB stack 14848af548dcSInaky Perez-Gonzalez * uses always #1 for the root hub of the controller. So USB stack's 14858af548dcSInaky Perez-Gonzalez * port #1, which is wusb virtual-port #0 has address #2. 1486c6515272SSarah Sharp * 1487c6515272SSarah Sharp * Devices connected under xHCI are not as simple. The host controller 1488c6515272SSarah Sharp * supports virtualization, so the hardware assigns device addresses and 1489c6515272SSarah Sharp * the HCD must setup data structures before issuing a set address 1490c6515272SSarah Sharp * command to the hardware. 14918af548dcSInaky Perez-Gonzalez */ 14921da177e4SLinus Torvalds static void choose_address(struct usb_device *udev) 14931da177e4SLinus Torvalds { 14941da177e4SLinus Torvalds int devnum; 14951da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 14961da177e4SLinus Torvalds 14971da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 14988af548dcSInaky Perez-Gonzalez if (udev->wusb) { 14998af548dcSInaky Perez-Gonzalez devnum = udev->portnum + 1; 15008af548dcSInaky Perez-Gonzalez BUG_ON(test_bit(devnum, bus->devmap.devicemap)); 15018af548dcSInaky Perez-Gonzalez } else { 15028af548dcSInaky Perez-Gonzalez /* Try to allocate the next devnum beginning at 15038af548dcSInaky Perez-Gonzalez * bus->devnum_next. */ 15041da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 15051da177e4SLinus Torvalds bus->devnum_next); 15061da177e4SLinus Torvalds if (devnum >= 128) 15078af548dcSInaky Perez-Gonzalez devnum = find_next_zero_bit(bus->devmap.devicemap, 15088af548dcSInaky Perez-Gonzalez 128, 1); 15091da177e4SLinus Torvalds bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); 15108af548dcSInaky Perez-Gonzalez } 15111da177e4SLinus Torvalds if (devnum < 128) { 15121da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 15131da177e4SLinus Torvalds udev->devnum = devnum; 15141da177e4SLinus Torvalds } 15151da177e4SLinus Torvalds } 15161da177e4SLinus Torvalds 15171da177e4SLinus Torvalds static void release_address(struct usb_device *udev) 15181da177e4SLinus Torvalds { 15191da177e4SLinus Torvalds if (udev->devnum > 0) { 15201da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 15211da177e4SLinus Torvalds udev->devnum = -1; 15221da177e4SLinus Torvalds } 15231da177e4SLinus Torvalds } 15241da177e4SLinus Torvalds 15254953d141SDavid Vrabel static void update_address(struct usb_device *udev, int devnum) 15264953d141SDavid Vrabel { 15274953d141SDavid Vrabel /* The address for a WUSB device is managed by wusbcore. */ 15284953d141SDavid Vrabel if (!udev->wusb) 15294953d141SDavid Vrabel udev->devnum = devnum; 15304953d141SDavid Vrabel } 15314953d141SDavid Vrabel 1532d5d4db70SAlan Stern #ifdef CONFIG_USB_SUSPEND 1533d5d4db70SAlan Stern 1534d5d4db70SAlan Stern static void usb_stop_pm(struct usb_device *udev) 1535d5d4db70SAlan Stern { 1536d5d4db70SAlan Stern /* Synchronize with the ksuspend thread to prevent any more 1537d5d4db70SAlan Stern * autosuspend requests from being submitted, and decrement 1538d5d4db70SAlan Stern * the parent's count of unsuspended children. 1539d5d4db70SAlan Stern */ 1540d5d4db70SAlan Stern usb_pm_lock(udev); 1541d5d4db70SAlan Stern if (udev->parent && !udev->discon_suspended) 1542d5d4db70SAlan Stern usb_autosuspend_device(udev->parent); 1543d5d4db70SAlan Stern usb_pm_unlock(udev); 1544d5d4db70SAlan Stern 15459ac39f28SAlan Stern /* Stop any autosuspend or autoresume requests already submitted */ 15469ac39f28SAlan Stern cancel_delayed_work_sync(&udev->autosuspend); 15479ac39f28SAlan Stern cancel_work_sync(&udev->autoresume); 1548d5d4db70SAlan Stern } 1549d5d4db70SAlan Stern 1550d5d4db70SAlan Stern #else 1551d5d4db70SAlan Stern 1552d5d4db70SAlan Stern static inline void usb_stop_pm(struct usb_device *udev) 1553d5d4db70SAlan Stern { } 1554d5d4db70SAlan Stern 1555d5d4db70SAlan Stern #endif 1556d5d4db70SAlan Stern 15571da177e4SLinus Torvalds /** 15581da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 15591da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 15601da177e4SLinus Torvalds * Context: !in_interrupt () 15611da177e4SLinus Torvalds * 15621da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 15631da177e4SLinus Torvalds * 15641da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 15651da177e4SLinus Torvalds * If *pdev is a root hub then this routine will acquire the 15661da177e4SLinus Torvalds * usb_bus_list_lock on behalf of the caller. 15671da177e4SLinus Torvalds * 15681da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 15691da177e4SLinus Torvalds * controllers) should ever call this. 15701da177e4SLinus Torvalds * 15711da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 15721da177e4SLinus Torvalds */ 15731da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 15741da177e4SLinus Torvalds { 15751da177e4SLinus Torvalds struct usb_device *udev = *pdev; 15761da177e4SLinus Torvalds int i; 15771da177e4SLinus Torvalds 15781da177e4SLinus Torvalds if (!udev) { 1579441b62c1SHarvey Harrison pr_debug ("%s nodev\n", __func__); 15801da177e4SLinus Torvalds return; 15811da177e4SLinus Torvalds } 15821da177e4SLinus Torvalds 15831da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 15841da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 15851da177e4SLinus Torvalds * this quiesces everyting except pending urbs. 15861da177e4SLinus Torvalds */ 15871da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 15881da177e4SLinus Torvalds dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); 15891da177e4SLinus Torvalds 15909ad3d6ccSAlan Stern usb_lock_device(udev); 15919ad3d6ccSAlan Stern 15921da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 15931da177e4SLinus Torvalds for (i = 0; i < USB_MAXCHILDREN; i++) { 15941da177e4SLinus Torvalds if (udev->children[i]) 15951da177e4SLinus Torvalds usb_disconnect(&udev->children[i]); 15961da177e4SLinus Torvalds } 15971da177e4SLinus Torvalds 15981da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 15991da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 16001da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 16011da177e4SLinus Torvalds */ 1602782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 16031da177e4SLinus Torvalds usb_disable_device(udev, 0); 1604cde217a5SAlan Stern usb_hcd_synchronize_unlinks(udev); 16051da177e4SLinus Torvalds 16063b23dd6fSAlan Stern usb_remove_ep_devs(&udev->ep0); 1607782da727SAlan Stern usb_unlock_device(udev); 16083099e75aSGreg Kroah-Hartman 1609782da727SAlan Stern /* Unregister the device. The device driver is responsible 16103b23dd6fSAlan Stern * for de-configuring the device and invoking the remove-device 16113b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 1612782da727SAlan Stern */ 1613782da727SAlan Stern device_del(&udev->dev); 1614782da727SAlan Stern 1615782da727SAlan Stern /* Free the device number and delete the parent's children[] 16161da177e4SLinus Torvalds * (or root_hub) pointer. 16171da177e4SLinus Torvalds */ 16181da177e4SLinus Torvalds release_address(udev); 16191da177e4SLinus Torvalds 16201da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 16211da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 16221da177e4SLinus Torvalds *pdev = NULL; 16231da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 16241da177e4SLinus Torvalds 1625d5d4db70SAlan Stern usb_stop_pm(udev); 1626ee49fb5dSAlan Stern 1627782da727SAlan Stern put_device(&udev->dev); 16281da177e4SLinus Torvalds } 16291da177e4SLinus Torvalds 1630f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 16311da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 16321da177e4SLinus Torvalds { 16331da177e4SLinus Torvalds if (!string) 16341da177e4SLinus Torvalds return; 16351da177e4SLinus Torvalds dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); 16361da177e4SLinus Torvalds } 16371da177e4SLinus Torvalds 1638f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 1639f2a383e4SGreg Kroah-Hartman { 1640f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", 1641f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 1642f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idProduct)); 1643b9cef6c3SWu Fengguang dev_info(&udev->dev, 1644b9cef6c3SWu Fengguang "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", 1645f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 1646f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 1647f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 1648f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 1649f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 1650f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 1651f2a383e4SGreg Kroah-Hartman } 16521da177e4SLinus Torvalds #else 1653f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 16541da177e4SLinus Torvalds #endif 16551da177e4SLinus Torvalds 16561da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 16571da177e4SLinus Torvalds #include "otg_whitelist.h" 16581da177e4SLinus Torvalds #endif 16591da177e4SLinus Torvalds 16603ede760fSOliver Neukum /** 16618d8558d1SAlan Stern * usb_enumerate_device_otg - FIXME (usbcore-internal) 16623ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 16633ede760fSOliver Neukum * 16648d8558d1SAlan Stern * Finish enumeration for On-The-Go devices 16653ede760fSOliver Neukum */ 16668d8558d1SAlan Stern static int usb_enumerate_device_otg(struct usb_device *udev) 16671da177e4SLinus Torvalds { 1668d9d16e8aSInaky Perez-Gonzalez int err = 0; 16691da177e4SLinus Torvalds 16701da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 16711da177e4SLinus Torvalds /* 16721da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 16731da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 16741da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 16751da177e4SLinus Torvalds */ 16761da177e4SLinus Torvalds if (!udev->bus->is_b_host 16771da177e4SLinus Torvalds && udev->config 16781da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 16792eb5052eSFelipe Balbi struct usb_otg_descriptor *desc = NULL; 16801da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 16811da177e4SLinus Torvalds 16821da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 16831da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 16841da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 16851da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 16861da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 168712c3da34SAlan Stern unsigned port1 = udev->portnum; 16881da177e4SLinus Torvalds 16891da177e4SLinus Torvalds dev_info(&udev->dev, 16901da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 16911da177e4SLinus Torvalds (port1 == bus->otg_port) 16921da177e4SLinus Torvalds ? "" : "non-"); 16931da177e4SLinus Torvalds 16941da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 16951da177e4SLinus Torvalds if (port1 == bus->otg_port) 16961da177e4SLinus Torvalds bus->b_hnp_enable = 1; 16971da177e4SLinus Torvalds err = usb_control_msg(udev, 16981da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 16991da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 17001da177e4SLinus Torvalds bus->b_hnp_enable 17011da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 17021da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 17031da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 17041da177e4SLinus Torvalds if (err < 0) { 17051da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 17061da177e4SLinus Torvalds * customize to match your product. 17071da177e4SLinus Torvalds */ 17081da177e4SLinus Torvalds dev_info(&udev->dev, 1709b9cef6c3SWu Fengguang "can't set HNP mode: %d\n", 17101da177e4SLinus Torvalds err); 17111da177e4SLinus Torvalds bus->b_hnp_enable = 0; 17121da177e4SLinus Torvalds } 17131da177e4SLinus Torvalds } 17141da177e4SLinus Torvalds } 17151da177e4SLinus Torvalds } 17161da177e4SLinus Torvalds 17171da177e4SLinus Torvalds if (!is_targeted(udev)) { 17181da177e4SLinus Torvalds 17191da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 17201da177e4SLinus Torvalds * (Includes HNP test device.) 17211da177e4SLinus Torvalds */ 17221da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 1723634a84f8SDavid Brownell err = usb_port_suspend(udev, PMSG_SUSPEND); 17241da177e4SLinus Torvalds if (err < 0) 17251da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 17261da177e4SLinus Torvalds } 1727ffcdc18dSVikram Pandita err = -ENOTSUPP; 17281da177e4SLinus Torvalds goto fail; 17291da177e4SLinus Torvalds } 1730d9d16e8aSInaky Perez-Gonzalez fail: 17311da177e4SLinus Torvalds #endif 1732d9d16e8aSInaky Perez-Gonzalez return err; 1733d9d16e8aSInaky Perez-Gonzalez } 17341da177e4SLinus Torvalds 1735d9d16e8aSInaky Perez-Gonzalez 1736d9d16e8aSInaky Perez-Gonzalez /** 17378d8558d1SAlan Stern * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) 1738d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 1739d9d16e8aSInaky Perez-Gonzalez * 1740d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 1741d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 1742d9d16e8aSInaky Perez-Gonzalez * environment. 1743d9d16e8aSInaky Perez-Gonzalez * 1744d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 1745d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 1746d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 1747d9d16e8aSInaky Perez-Gonzalez */ 17488d8558d1SAlan Stern static int usb_enumerate_device(struct usb_device *udev) 1749d9d16e8aSInaky Perez-Gonzalez { 1750d9d16e8aSInaky Perez-Gonzalez int err; 1751d9d16e8aSInaky Perez-Gonzalez 1752d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 1753d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 1754d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 1755d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 1756d9d16e8aSInaky Perez-Gonzalez err); 1757d9d16e8aSInaky Perez-Gonzalez goto fail; 1758d9d16e8aSInaky Perez-Gonzalez } 1759d9d16e8aSInaky Perez-Gonzalez } 1760d9d16e8aSInaky Perez-Gonzalez if (udev->wusb == 1 && udev->authorized == 0) { 1761d9d16e8aSInaky Perez-Gonzalez udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1762d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1763d9d16e8aSInaky Perez-Gonzalez udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1764d9d16e8aSInaky Perez-Gonzalez } 1765d9d16e8aSInaky Perez-Gonzalez else { 1766d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 1767d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 1768d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 1769d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 1770d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 1771d9d16e8aSInaky Perez-Gonzalez } 17728d8558d1SAlan Stern err = usb_enumerate_device_otg(udev); 1773d9d16e8aSInaky Perez-Gonzalez fail: 1774d9d16e8aSInaky Perez-Gonzalez return err; 1775d9d16e8aSInaky Perez-Gonzalez } 1776d9d16e8aSInaky Perez-Gonzalez 1777d9d16e8aSInaky Perez-Gonzalez 1778d9d16e8aSInaky Perez-Gonzalez /** 1779d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 1780d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 1781d9d16e8aSInaky Perez-Gonzalez * 17828d8558d1SAlan Stern * This is called with devices which have been detected but not fully 17838d8558d1SAlan Stern * enumerated. The device descriptor is available, but not descriptors 1784d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 1785d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 1786d9d16e8aSInaky Perez-Gonzalez * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 1787d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 1788d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 1789d9d16e8aSInaky Perez-Gonzalez * 1790d9d16e8aSInaky Perez-Gonzalez * It will return if the device is configured properly or not. Zero if 1791d9d16e8aSInaky Perez-Gonzalez * the interface was registered with the driver core; else a negative 1792d9d16e8aSInaky Perez-Gonzalez * errno value. 1793d9d16e8aSInaky Perez-Gonzalez * 1794d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 1795d9d16e8aSInaky Perez-Gonzalez * 1796d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 1797d9d16e8aSInaky Perez-Gonzalez */ 1798d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 1799d9d16e8aSInaky Perez-Gonzalez { 1800d9d16e8aSInaky Perez-Gonzalez int err; 1801d9d16e8aSInaky Perez-Gonzalez 18026cd13201SAlan Stern /* Increment the parent's count of unsuspended children */ 18036cd13201SAlan Stern if (udev->parent) 18046cd13201SAlan Stern usb_autoresume_device(udev->parent); 18056cd13201SAlan Stern 18068d8558d1SAlan Stern usb_detect_quirks(udev); 18078d8558d1SAlan Stern err = usb_enumerate_device(udev); /* Read descriptors */ 1808d9d16e8aSInaky Perez-Gonzalez if (err < 0) 1809d9d16e8aSInaky Perez-Gonzalez goto fail; 1810c6515272SSarah Sharp dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", 1811c6515272SSarah Sharp udev->devnum, udev->bus->busnum, 1812c6515272SSarah Sharp (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 18139f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 18149f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 18159f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 18169f8b17e6SKay Sievers 18176cd13201SAlan Stern /* Tell the world! */ 18186cd13201SAlan Stern announce_device(udev); 1819195af2ccSAlan Stern 1820782da727SAlan Stern /* Register the device. The device driver is responsible 18213b23dd6fSAlan Stern * for configuring the device and invoking the add-device 18223b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 1823782da727SAlan Stern */ 18241da177e4SLinus Torvalds err = device_add(&udev->dev); 18251da177e4SLinus Torvalds if (err) { 18261da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 18271da177e4SLinus Torvalds goto fail; 18281da177e4SLinus Torvalds } 18299ad3d6ccSAlan Stern 18303b23dd6fSAlan Stern (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); 1831c066475eSGreg Kroah-Hartman return err; 18321da177e4SLinus Torvalds 18331da177e4SLinus Torvalds fail: 18341da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 18356cd13201SAlan Stern usb_stop_pm(udev); 1836d9d16e8aSInaky Perez-Gonzalez return err; 18371da177e4SLinus Torvalds } 18381da177e4SLinus Torvalds 183993993a0aSInaky Perez-Gonzalez 184093993a0aSInaky Perez-Gonzalez /** 1841fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 1842fd39c86bSRandy Dunlap * @usb_dev: USB device 1843fd39c86bSRandy Dunlap * 1844fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 1845fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 184693993a0aSInaky Perez-Gonzalez * 184793993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 184893993a0aSInaky Perez-Gonzalez * defer its call. 184993993a0aSInaky Perez-Gonzalez */ 185093993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 185193993a0aSInaky Perez-Gonzalez { 185293993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 185393993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 185493993a0aSInaky Perez-Gonzalez goto out_unauthorized; 1855da307123SAlan Stern 185693993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 185793993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 1858da307123SAlan Stern 1859da307123SAlan Stern kfree(usb_dev->product); 186093993a0aSInaky Perez-Gonzalez usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1861da307123SAlan Stern kfree(usb_dev->manufacturer); 186293993a0aSInaky Perez-Gonzalez usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1863da307123SAlan Stern kfree(usb_dev->serial); 186493993a0aSInaky Perez-Gonzalez usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1865da307123SAlan Stern 1866da307123SAlan Stern usb_destroy_configuration(usb_dev); 186793993a0aSInaky Perez-Gonzalez usb_dev->descriptor.bNumConfigurations = 0; 1868da307123SAlan Stern 186993993a0aSInaky Perez-Gonzalez out_unauthorized: 187093993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 187193993a0aSInaky Perez-Gonzalez return 0; 187293993a0aSInaky Perez-Gonzalez } 187393993a0aSInaky Perez-Gonzalez 187493993a0aSInaky Perez-Gonzalez 187593993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 187693993a0aSInaky Perez-Gonzalez { 187793993a0aSInaky Perez-Gonzalez int result = 0, c; 1878da307123SAlan Stern 187993993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 188093993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 188193993a0aSInaky Perez-Gonzalez goto out_authorized; 1882da307123SAlan Stern 188393993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 188493993a0aSInaky Perez-Gonzalez if (result < 0) { 188593993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 188693993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 188793993a0aSInaky Perez-Gonzalez goto error_autoresume; 188893993a0aSInaky Perez-Gonzalez } 188993993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 189093993a0aSInaky Perez-Gonzalez if (result < 0) { 189193993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 189293993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 189393993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 189493993a0aSInaky Perez-Gonzalez } 1895da307123SAlan Stern 1896da307123SAlan Stern kfree(usb_dev->product); 1897da307123SAlan Stern usb_dev->product = NULL; 1898da307123SAlan Stern kfree(usb_dev->manufacturer); 1899da307123SAlan Stern usb_dev->manufacturer = NULL; 1900da307123SAlan Stern kfree(usb_dev->serial); 1901da307123SAlan Stern usb_dev->serial = NULL; 1902da307123SAlan Stern 190393993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 19048d8558d1SAlan Stern result = usb_enumerate_device(usb_dev); 190593993a0aSInaky Perez-Gonzalez if (result < 0) 19068d8558d1SAlan Stern goto error_enumerate; 190793993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 190893993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 190993993a0aSInaky Perez-Gonzalez */ 1910b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 191193993a0aSInaky Perez-Gonzalez if (c >= 0) { 191293993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 191393993a0aSInaky Perez-Gonzalez if (result) { 191493993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 191593993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 191693993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 191793993a0aSInaky Perez-Gonzalez * set other configurations. */ 191893993a0aSInaky Perez-Gonzalez } 191993993a0aSInaky Perez-Gonzalez } 192093993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 1921da307123SAlan Stern 19228d8558d1SAlan Stern error_enumerate: 192393993a0aSInaky Perez-Gonzalez error_device_descriptor: 1924da307123SAlan Stern usb_autosuspend_device(usb_dev); 192593993a0aSInaky Perez-Gonzalez error_autoresume: 192693993a0aSInaky Perez-Gonzalez out_authorized: 192793993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); // complements locktree 192893993a0aSInaky Perez-Gonzalez return result; 192993993a0aSInaky Perez-Gonzalez } 193093993a0aSInaky Perez-Gonzalez 193193993a0aSInaky Perez-Gonzalez 19320165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 19330165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 19340165de09SInaky Perez-Gonzalez { 19350165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 19360165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 19370165de09SInaky Perez-Gonzalez return 0; 19380165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 19390165de09SInaky Perez-Gonzalez return hcd->wireless; 19400165de09SInaky Perez-Gonzalez } 19410165de09SInaky Perez-Gonzalez 19420165de09SInaky Perez-Gonzalez 19431da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 19441da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 19451da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 19461da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 19471da177e4SLinus Torvalds #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) 19481da177e4SLinus Torvalds 19491da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 19501da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 19511da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 19521da177e4SLinus Torvalds #define HUB_RESET_TIMEOUT 500 19531da177e4SLinus Torvalds 19541da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 19551da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 19561da177e4SLinus Torvalds { 19571da177e4SLinus Torvalds int delay_time, ret; 19581da177e4SLinus Torvalds u16 portstatus; 19591da177e4SLinus Torvalds u16 portchange; 19601da177e4SLinus Torvalds 19611da177e4SLinus Torvalds for (delay_time = 0; 19621da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 19631da177e4SLinus Torvalds delay_time += delay) { 19641da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 19651da177e4SLinus Torvalds msleep(delay); 19661da177e4SLinus Torvalds 19671da177e4SLinus Torvalds /* read and decode port status */ 19681da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 19691da177e4SLinus Torvalds if (ret < 0) 19701da177e4SLinus Torvalds return ret; 19711da177e4SLinus Torvalds 19721da177e4SLinus Torvalds /* Device went away? */ 19731da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 19741da177e4SLinus Torvalds return -ENOTCONN; 19751da177e4SLinus Torvalds 1976dd4dd19eSAlan Stern /* bomb out completely if the connection bounced */ 19771da177e4SLinus Torvalds if ((portchange & USB_PORT_STAT_C_CONNECTION)) 1978dd4dd19eSAlan Stern return -ENOTCONN; 19791da177e4SLinus Torvalds 19801da177e4SLinus Torvalds /* if we`ve finished resetting, then break out of the loop */ 19811da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_RESET) && 19821da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_ENABLE)) { 19830165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 19840165de09SInaky Perez-Gonzalez udev->speed = USB_SPEED_VARIABLE; 19850165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 19861da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 19871da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 19881da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 19891da177e4SLinus Torvalds else 19901da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 19911da177e4SLinus Torvalds return 0; 19921da177e4SLinus Torvalds } 19931da177e4SLinus Torvalds 19941da177e4SLinus Torvalds /* switch to the long delay after two short delay failures */ 19951da177e4SLinus Torvalds if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 19961da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 19971da177e4SLinus Torvalds 19981da177e4SLinus Torvalds dev_dbg (hub->intfdev, 19991da177e4SLinus Torvalds "port %d not reset yet, waiting %dms\n", 20001da177e4SLinus Torvalds port1, delay); 20011da177e4SLinus Torvalds } 20021da177e4SLinus Torvalds 20031da177e4SLinus Torvalds return -EBUSY; 20041da177e4SLinus Torvalds } 20051da177e4SLinus Torvalds 20061da177e4SLinus Torvalds static int hub_port_reset(struct usb_hub *hub, int port1, 20071da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 20081da177e4SLinus Torvalds { 20091da177e4SLinus Torvalds int i, status; 20101da177e4SLinus Torvalds 201132fe0198SAlan Stern /* Block EHCI CF initialization during the port reset. 201232fe0198SAlan Stern * Some companion controllers don't like it when they mix. 201332fe0198SAlan Stern */ 201432fe0198SAlan Stern down_read(&ehci_cf_port_reset_rwsem); 201532fe0198SAlan Stern 20161da177e4SLinus Torvalds /* Reset the port */ 20171da177e4SLinus Torvalds for (i = 0; i < PORT_RESET_TRIES; i++) { 20181da177e4SLinus Torvalds status = set_port_feature(hub->hdev, 20191da177e4SLinus Torvalds port1, USB_PORT_FEAT_RESET); 20201da177e4SLinus Torvalds if (status) 20211da177e4SLinus Torvalds dev_err(hub->intfdev, 20221da177e4SLinus Torvalds "cannot reset port %d (err = %d)\n", 20231da177e4SLinus Torvalds port1, status); 20241da177e4SLinus Torvalds else { 20251da177e4SLinus Torvalds status = hub_port_wait_reset(hub, port1, udev, delay); 2026dd16525bSDavid Brownell if (status && status != -ENOTCONN) 20271da177e4SLinus Torvalds dev_dbg(hub->intfdev, 20281da177e4SLinus Torvalds "port_wait_reset: err = %d\n", 20291da177e4SLinus Torvalds status); 20301da177e4SLinus Torvalds } 20311da177e4SLinus Torvalds 20321da177e4SLinus Torvalds /* return on disconnect or reset */ 20331da177e4SLinus Torvalds switch (status) { 20341da177e4SLinus Torvalds case 0: 2035b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 2036b789696aSDavid Brownell msleep(10 + 40); 20374953d141SDavid Vrabel update_address(udev, 0); 20381da177e4SLinus Torvalds /* FALL THROUGH */ 20391da177e4SLinus Torvalds case -ENOTCONN: 20401da177e4SLinus Torvalds case -ENODEV: 20411da177e4SLinus Torvalds clear_port_feature(hub->hdev, 20421da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 20431da177e4SLinus Torvalds /* FIXME need disconnect() for NOTATTACHED device */ 20441da177e4SLinus Torvalds usb_set_device_state(udev, status 20451da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 20461da177e4SLinus Torvalds : USB_STATE_DEFAULT); 204732fe0198SAlan Stern goto done; 20481da177e4SLinus Torvalds } 20491da177e4SLinus Torvalds 20501da177e4SLinus Torvalds dev_dbg (hub->intfdev, 20511da177e4SLinus Torvalds "port %d not enabled, trying reset again...\n", 20521da177e4SLinus Torvalds port1); 20531da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 20541da177e4SLinus Torvalds } 20551da177e4SLinus Torvalds 20561da177e4SLinus Torvalds dev_err (hub->intfdev, 20571da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 20581da177e4SLinus Torvalds port1); 20591da177e4SLinus Torvalds 206032fe0198SAlan Stern done: 206132fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 20621da177e4SLinus Torvalds return status; 20631da177e4SLinus Torvalds } 20641da177e4SLinus Torvalds 2065d388dab7SAlan Stern #ifdef CONFIG_PM 20661da177e4SLinus Torvalds 2067b01b03f3SAlan Stern #define MASK_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | \ 2068b01b03f3SAlan Stern USB_PORT_STAT_SUSPEND) 2069b01b03f3SAlan Stern #define WANT_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION) 2070b01b03f3SAlan Stern 2071b01b03f3SAlan Stern /* Determine whether the device on a port is ready for a normal resume, 2072b01b03f3SAlan Stern * is ready for a reset-resume, or should be disconnected. 2073b01b03f3SAlan Stern */ 2074b01b03f3SAlan Stern static int check_port_resume_type(struct usb_device *udev, 2075b01b03f3SAlan Stern struct usb_hub *hub, int port1, 2076b01b03f3SAlan Stern int status, unsigned portchange, unsigned portstatus) 2077b01b03f3SAlan Stern { 2078b01b03f3SAlan Stern /* Is the device still present? */ 2079b01b03f3SAlan Stern if (status || (portstatus & MASK_BITS) != WANT_BITS) { 2080b01b03f3SAlan Stern if (status >= 0) 2081b01b03f3SAlan Stern status = -ENODEV; 2082b01b03f3SAlan Stern } 2083b01b03f3SAlan Stern 208486c57edfSAlan Stern /* Can't do a normal resume if the port isn't enabled, 208586c57edfSAlan Stern * so try a reset-resume instead. 208686c57edfSAlan Stern */ 208786c57edfSAlan Stern else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { 208886c57edfSAlan Stern if (udev->persist_enabled) 208986c57edfSAlan Stern udev->reset_resume = 1; 209086c57edfSAlan Stern else 2091b01b03f3SAlan Stern status = -ENODEV; 209286c57edfSAlan Stern } 2093b01b03f3SAlan Stern 2094b01b03f3SAlan Stern if (status) { 2095b01b03f3SAlan Stern dev_dbg(hub->intfdev, 2096b01b03f3SAlan Stern "port %d status %04x.%04x after resume, %d\n", 2097b01b03f3SAlan Stern port1, portchange, portstatus, status); 2098b01b03f3SAlan Stern } else if (udev->reset_resume) { 2099b01b03f3SAlan Stern 2100b01b03f3SAlan Stern /* Late port handoff can set status-change bits */ 2101b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) 2102b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2103b01b03f3SAlan Stern USB_PORT_FEAT_C_CONNECTION); 2104b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) 2105b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2106b01b03f3SAlan Stern USB_PORT_FEAT_C_ENABLE); 2107b01b03f3SAlan Stern } 2108b01b03f3SAlan Stern 2109b01b03f3SAlan Stern return status; 2110b01b03f3SAlan Stern } 2111b01b03f3SAlan Stern 21121da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 21131da177e4SLinus Torvalds 21141da177e4SLinus Torvalds /* 2115140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 2116624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 21175edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 21181da177e4SLinus Torvalds * 21191da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 21201da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 21211da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 2122140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 21231da177e4SLinus Torvalds * to disconnect devices while they are suspended. 21241da177e4SLinus Torvalds * 2125390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 2126390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 2127390a8c34SDavid Brownell * 2128624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 2129624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 2130624d6c07SAlan Stern * All devices below the suspended port are also suspended. 2131624d6c07SAlan Stern * 2132624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 2133624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 2134624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 2135624d6c07SAlan Stern * some cases, this wakes the USB host. 2136624d6c07SAlan Stern * 21371da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 21381da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 21391da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 21401da177e4SLinus Torvalds * 21414956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 21424956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 21434956eccdSAlan Stern * State transitions include: 21444956eccdSAlan Stern * 21454956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 21464956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 21474956eccdSAlan Stern * 21484956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 21494956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 21504956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 21514956eccdSAlan Stern * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 21524956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 21534956eccdSAlan Stern * 21544956eccdSAlan Stern * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when 21554956eccdSAlan Stern * the root hub for their bus goes into global suspend ... so we don't 21564956eccdSAlan Stern * (falsely) update the device power state to say it suspended. 21574956eccdSAlan Stern * 21581da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 21591da177e4SLinus Torvalds */ 216065bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 21611da177e4SLinus Torvalds { 2162624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2163624d6c07SAlan Stern int port1 = udev->portnum; 2164624d6c07SAlan Stern int status; 21654956eccdSAlan Stern 2166624d6c07SAlan Stern // dev_dbg(hub->intfdev, "suspend port %d\n", port1); 2167624d6c07SAlan Stern 2168624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 2169624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 2170624d6c07SAlan Stern * 2171624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 2172624d6c07SAlan Stern * we don't explicitly enable it here. 2173624d6c07SAlan Stern */ 2174624d6c07SAlan Stern if (udev->do_remote_wakeup) { 2175624d6c07SAlan Stern status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2176624d6c07SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 2177624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 2178624d6c07SAlan Stern NULL, 0, 2179624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 21800c487206SOliver Neukum if (status) { 2181624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 2182624d6c07SAlan Stern status); 21830c487206SOliver Neukum /* bail if autosuspend is requested */ 21840c487206SOliver Neukum if (msg.event & PM_EVENT_AUTO) 21850c487206SOliver Neukum return status; 21860c487206SOliver Neukum } 2187624d6c07SAlan Stern } 2188624d6c07SAlan Stern 2189624d6c07SAlan Stern /* see 7.1.7.6 */ 2190624d6c07SAlan Stern status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); 2191624d6c07SAlan Stern if (status) { 2192624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", 2193624d6c07SAlan Stern port1, status); 2194624d6c07SAlan Stern /* paranoia: "should not happen" */ 21950c487206SOliver Neukum if (udev->do_remote_wakeup) 2196624d6c07SAlan Stern (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2197624d6c07SAlan Stern USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 2198624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 2199624d6c07SAlan Stern NULL, 0, 2200624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 2201624d6c07SAlan Stern } else { 2202624d6c07SAlan Stern /* device has up to 10 msec to fully suspend */ 2203624d6c07SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend\n", 220465bfd296SAlan Stern (msg.event & PM_EVENT_AUTO ? "auto-" : "")); 2205624d6c07SAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 2206624d6c07SAlan Stern msleep(10); 2207624d6c07SAlan Stern } 22084956eccdSAlan Stern return status; 22091da177e4SLinus Torvalds } 2210f3f3253dSDavid Brownell 22111da177e4SLinus Torvalds /* 2212390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 2213390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 221454515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 22151da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 22161da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 22171da177e4SLinus Torvalds * in the tree that's rooted at this device. 221854515fe5SAlan Stern * 221954515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 222054515fe5SAlan Stern * status check is done. 22211da177e4SLinus Torvalds */ 2222140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 22231da177e4SLinus Torvalds { 222454515fe5SAlan Stern int status = 0; 22251da177e4SLinus Torvalds u16 devstatus; 22261da177e4SLinus Torvalds 22271da177e4SLinus Torvalds /* caller owns the udev device lock */ 2228b9cef6c3SWu Fengguang dev_dbg(&udev->dev, "%s\n", 2229b9cef6c3SWu Fengguang udev->reset_resume ? "finish reset-resume" : "finish resume"); 22301da177e4SLinus Torvalds 22311da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 22321da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 22331da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 22341da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 22351da177e4SLinus Torvalds */ 22361da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 22371da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 22381da177e4SLinus Torvalds : USB_STATE_ADDRESS); 22391da177e4SLinus Torvalds 224054515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 224154515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 224254515fe5SAlan Stern * operation is carried out here, after the port has been 224354515fe5SAlan Stern * resumed. 224454515fe5SAlan Stern */ 224554515fe5SAlan Stern if (udev->reset_resume) 224686c57edfSAlan Stern retry_reset_resume: 2247742120c6SMing Lei status = usb_reset_and_verify_device(udev); 224854515fe5SAlan Stern 22491da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 22501da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 22511da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 22521da177e4SLinus Torvalds */ 225354515fe5SAlan Stern if (status == 0) { 225446dede46SAlan Stern devstatus = 0; 22551da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 2256b40b7a90SAlan Stern if (status >= 0) 225746dede46SAlan Stern status = (status > 0 ? 0 : -ENODEV); 225886c57edfSAlan Stern 225986c57edfSAlan Stern /* If a normal resume failed, try doing a reset-resume */ 226086c57edfSAlan Stern if (status && !udev->reset_resume && udev->persist_enabled) { 226186c57edfSAlan Stern dev_dbg(&udev->dev, "retry with reset-resume\n"); 226286c57edfSAlan Stern udev->reset_resume = 1; 226386c57edfSAlan Stern goto retry_reset_resume; 226486c57edfSAlan Stern } 226554515fe5SAlan Stern } 2266b40b7a90SAlan Stern 2267624d6c07SAlan Stern if (status) { 2268624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 22691da177e4SLinus Torvalds status); 2270624d6c07SAlan Stern } else if (udev->actconfig) { 22711da177e4SLinus Torvalds le16_to_cpus(&devstatus); 2272686314cfSAlan Stern if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { 22731da177e4SLinus Torvalds status = usb_control_msg(udev, 22741da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 22751da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, 22761da177e4SLinus Torvalds USB_RECIP_DEVICE, 22771da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 22781da177e4SLinus Torvalds NULL, 0, 22791da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 2280a8e7c565SAlan Stern if (status) 2281b9cef6c3SWu Fengguang dev_dbg(&udev->dev, 2282b9cef6c3SWu Fengguang "disable remote wakeup, status %d\n", 2283b9cef6c3SWu Fengguang status); 22844bf0ba86SAlan Stern } 22851da177e4SLinus Torvalds status = 0; 22861da177e4SLinus Torvalds } 22871da177e4SLinus Torvalds return status; 22881da177e4SLinus Torvalds } 22891da177e4SLinus Torvalds 2290624d6c07SAlan Stern /* 2291624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 2292624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 2293624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 2294624d6c07SAlan Stern * 2295624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 2296624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 2297624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 2298624d6c07SAlan Stern * the host and the device is the same as it was when the device 2299624d6c07SAlan Stern * suspended. 2300624d6c07SAlan Stern * 2301feccc30dSAlan Stern * If @udev->reset_resume is set then this routine won't check that the 2302feccc30dSAlan Stern * port is still enabled. Furthermore, finish_port_resume() above will 230354515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 230454515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 230554515fe5SAlan Stern * 230654515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 230754515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 230854515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 230954515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 231054515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 231154515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 231254515fe5SAlan Stern * made to appear as if it had not disconnected. 231354515fe5SAlan Stern * 2314742120c6SMing Lei * This facility can be dangerous. Although usb_reset_and_verify_device() makes 2315feccc30dSAlan Stern * every effort to insure that the same device is present after the 231654515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 231754515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 231854515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 231954515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 232054515fe5SAlan Stern * new card is corrupted and the system crashes. 232154515fe5SAlan Stern * 2322624d6c07SAlan Stern * Returns 0 on success, else negative errno. 2323624d6c07SAlan Stern */ 232465bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 23251da177e4SLinus Torvalds { 2326624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2327624d6c07SAlan Stern int port1 = udev->portnum; 23281da177e4SLinus Torvalds int status; 2329d25450c6SAlan Stern u16 portchange, portstatus; 2330d25450c6SAlan Stern 2331d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 2332d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 2333d25450c6SAlan Stern if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND)) 2334d25450c6SAlan Stern goto SuspendCleared; 23351da177e4SLinus Torvalds 23361da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "resume port %d\n", port1); 23371da177e4SLinus Torvalds 2338d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 2339d5cbad4bSAlan Stern 23401da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 23411da177e4SLinus Torvalds status = clear_port_feature(hub->hdev, 23421da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 23431da177e4SLinus Torvalds if (status) { 2344624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", 23451da177e4SLinus Torvalds port1, status); 23461da177e4SLinus Torvalds } else { 23471da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 2348645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 234965bfd296SAlan Stern (msg.event & PM_EVENT_AUTO ? "auto-" : "")); 23501da177e4SLinus Torvalds msleep(25); 23511da177e4SLinus Torvalds 23521da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 23531da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 23541da177e4SLinus Torvalds * sequence. 23551da177e4SLinus Torvalds */ 2356d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 235754515fe5SAlan Stern 23581da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 23591da177e4SLinus Torvalds msleep(10); 23601da177e4SLinus Torvalds } 2361b01b03f3SAlan Stern 2362b01b03f3SAlan Stern SuspendCleared: 2363b01b03f3SAlan Stern if (status == 0) { 2364b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 2365b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2366b01b03f3SAlan Stern USB_PORT_FEAT_C_SUSPEND); 23671da177e4SLinus Torvalds } 23681da177e4SLinus Torvalds 2369d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 2370d5cbad4bSAlan Stern 2371b01b03f3SAlan Stern status = check_port_resume_type(udev, 2372b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 237354515fe5SAlan Stern if (status == 0) 237454515fe5SAlan Stern status = finish_port_resume(udev); 237554515fe5SAlan Stern if (status < 0) { 237654515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 237754515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 237854515fe5SAlan Stern } 23791da177e4SLinus Torvalds return status; 23801da177e4SLinus Torvalds } 23811da177e4SLinus Torvalds 23828808f00cSAlan Stern /* caller has locked udev */ 23831da177e4SLinus Torvalds static int remote_wakeup(struct usb_device *udev) 23841da177e4SLinus Torvalds { 23851da177e4SLinus Torvalds int status = 0; 23861da177e4SLinus Torvalds 23871da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 2388645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 23891941044aSAlan Stern usb_mark_last_busy(udev); 239065bfd296SAlan Stern status = usb_external_resume_device(udev, PMSG_REMOTE_RESUME); 2391d25450c6SAlan Stern } 23921da177e4SLinus Torvalds return status; 23931da177e4SLinus Torvalds } 23941da177e4SLinus Torvalds 2395d388dab7SAlan Stern #else /* CONFIG_USB_SUSPEND */ 2396d388dab7SAlan Stern 2397d388dab7SAlan Stern /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ 2398d388dab7SAlan Stern 239965bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 2400d388dab7SAlan Stern { 2401d388dab7SAlan Stern return 0; 2402d388dab7SAlan Stern } 2403d388dab7SAlan Stern 2404b01b03f3SAlan Stern /* However we may need to do a reset-resume */ 2405b01b03f3SAlan Stern 240665bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 2407d388dab7SAlan Stern { 2408b01b03f3SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2409b01b03f3SAlan Stern int port1 = udev->portnum; 2410b01b03f3SAlan Stern int status; 2411b01b03f3SAlan Stern u16 portchange, portstatus; 241254515fe5SAlan Stern 2413b01b03f3SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 2414b01b03f3SAlan Stern status = check_port_resume_type(udev, 2415b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 2416b01b03f3SAlan Stern 2417b01b03f3SAlan Stern if (status) { 2418b01b03f3SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 2419b01b03f3SAlan Stern hub_port_logical_disconnect(hub, port1); 2420b01b03f3SAlan Stern } else if (udev->reset_resume) { 242154515fe5SAlan Stern dev_dbg(&udev->dev, "reset-resume\n"); 2422742120c6SMing Lei status = usb_reset_and_verify_device(udev); 242354515fe5SAlan Stern } 242454515fe5SAlan Stern return status; 2425d388dab7SAlan Stern } 2426d388dab7SAlan Stern 2427d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 2428d388dab7SAlan Stern { 2429d388dab7SAlan Stern return 0; 2430d388dab7SAlan Stern } 2431d388dab7SAlan Stern 2432d388dab7SAlan Stern #endif 2433d388dab7SAlan Stern 2434db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 24351da177e4SLinus Torvalds { 24361da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 24371da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 24381da177e4SLinus Torvalds unsigned port1; 24391da177e4SLinus Torvalds 2440c9f89fa4SDavid Brownell /* fail if children aren't already suspended */ 24411da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 24421da177e4SLinus Torvalds struct usb_device *udev; 24431da177e4SLinus Torvalds 24441da177e4SLinus Torvalds udev = hdev->children [port1-1]; 24456840d255SAlan Stern if (udev && udev->can_submit) { 244665bfd296SAlan Stern if (!(msg.event & PM_EVENT_AUTO)) 2447645daaabSAlan Stern dev_dbg(&intf->dev, "port %d nyet suspended\n", 2448645daaabSAlan Stern port1); 2449c9f89fa4SDavid Brownell return -EBUSY; 2450c9f89fa4SDavid Brownell } 24511da177e4SLinus Torvalds } 24521da177e4SLinus Torvalds 2453441b62c1SHarvey Harrison dev_dbg(&intf->dev, "%s\n", __func__); 245440f122f3SAlan Stern 2455c9f89fa4SDavid Brownell /* stop khubd and related activity */ 24564330354fSAlan Stern hub_quiesce(hub, HUB_SUSPEND); 2457b6f6436dSAlan Stern return 0; 24581da177e4SLinus Torvalds } 24591da177e4SLinus Torvalds 24601da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 24611da177e4SLinus Torvalds { 24621da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 24631da177e4SLinus Torvalds 24645e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 2465f2835219SAlan Stern hub_activate(hub, HUB_RESUME); 24661da177e4SLinus Torvalds return 0; 24671da177e4SLinus Torvalds } 24681da177e4SLinus Torvalds 2469b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 2470f07600cfSAlan Stern { 2471b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 2472f07600cfSAlan Stern 24735e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 2474f2835219SAlan Stern hub_activate(hub, HUB_RESET_RESUME); 2475f07600cfSAlan Stern return 0; 2476f07600cfSAlan Stern } 2477f07600cfSAlan Stern 247854515fe5SAlan Stern /** 247954515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 248054515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 248154515fe5SAlan Stern * 248254515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 248354515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 2484feccc30dSAlan Stern * has been reset. The routine marks @rhdev as having lost power. 2485feccc30dSAlan Stern * When the hub driver is resumed it will take notice and carry out 2486feccc30dSAlan Stern * power-session recovery for all the "USB-PERSIST"-enabled child devices; 2487feccc30dSAlan Stern * the others will be disconnected. 248854515fe5SAlan Stern */ 248954515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 249054515fe5SAlan Stern { 249154515fe5SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 249254515fe5SAlan Stern rhdev->reset_resume = 1; 249354515fe5SAlan Stern } 249454515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 249554515fe5SAlan Stern 2496d388dab7SAlan Stern #else /* CONFIG_PM */ 2497d388dab7SAlan Stern 2498d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 2499d388dab7SAlan Stern { 2500d388dab7SAlan Stern return 0; 2501d388dab7SAlan Stern } 2502d388dab7SAlan Stern 2503511366daSAndrew Morton #define hub_suspend NULL 2504511366daSAndrew Morton #define hub_resume NULL 2505f07600cfSAlan Stern #define hub_reset_resume NULL 2506d388dab7SAlan Stern #endif 2507d388dab7SAlan Stern 25081da177e4SLinus Torvalds 25091da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 25101da177e4SLinus Torvalds * 25111da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 25121da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 25131da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 25141da177e4SLinus Torvalds * 25151da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 25161da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 25171da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 25181da177e4SLinus Torvalds * 25191da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 25201da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 25211da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 25221da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 25231da177e4SLinus Torvalds */ 25241da177e4SLinus Torvalds static int hub_port_debounce(struct usb_hub *hub, int port1) 25251da177e4SLinus Torvalds { 25261da177e4SLinus Torvalds int ret; 25271da177e4SLinus Torvalds int total_time, stable_time = 0; 25281da177e4SLinus Torvalds u16 portchange, portstatus; 25291da177e4SLinus Torvalds unsigned connection = 0xffff; 25301da177e4SLinus Torvalds 25311da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 25321da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 25331da177e4SLinus Torvalds if (ret < 0) 25341da177e4SLinus Torvalds return ret; 25351da177e4SLinus Torvalds 25361da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 25371da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 25381da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 25391da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 25401da177e4SLinus Torvalds break; 25411da177e4SLinus Torvalds } else { 25421da177e4SLinus Torvalds stable_time = 0; 25431da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 25441da177e4SLinus Torvalds } 25451da177e4SLinus Torvalds 25461da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 25471da177e4SLinus Torvalds clear_port_feature(hub->hdev, port1, 25481da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 25491da177e4SLinus Torvalds } 25501da177e4SLinus Torvalds 25511da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 25521da177e4SLinus Torvalds break; 25531da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 25541da177e4SLinus Torvalds } 25551da177e4SLinus Torvalds 25561da177e4SLinus Torvalds dev_dbg (hub->intfdev, 25571da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 25581da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 25591da177e4SLinus Torvalds 25601da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 25611da177e4SLinus Torvalds return -ETIMEDOUT; 25621da177e4SLinus Torvalds return portstatus; 25631da177e4SLinus Torvalds } 25641da177e4SLinus Torvalds 2565fc721f51SInaky Perez-Gonzalez void usb_ep0_reinit(struct usb_device *udev) 25661da177e4SLinus Torvalds { 2567ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); 2568ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); 25692caf7fcdSAlan Stern usb_enable_endpoint(udev, &udev->ep0, true); 25701da177e4SLinus Torvalds } 2571fc721f51SInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_ep0_reinit); 25721da177e4SLinus Torvalds 25731da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 25741da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 25751da177e4SLinus Torvalds 25764326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 25771da177e4SLinus Torvalds { 25781da177e4SLinus Torvalds int retval; 2579c6515272SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 25801da177e4SLinus Torvalds 2581c6515272SSarah Sharp /* 2582c6515272SSarah Sharp * The host controller will choose the device address, 2583c6515272SSarah Sharp * instead of the core having chosen it earlier 2584c6515272SSarah Sharp */ 2585c6515272SSarah Sharp if (!hcd->driver->address_device && devnum <= 1) 25861da177e4SLinus Torvalds return -EINVAL; 25871da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 25881da177e4SLinus Torvalds return 0; 25891da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 25901da177e4SLinus Torvalds return -EINVAL; 2591c6515272SSarah Sharp if (hcd->driver->address_device) { 2592c6515272SSarah Sharp retval = hcd->driver->address_device(hcd, udev); 2593c6515272SSarah Sharp } else { 25941da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 25954326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 25961da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 2597c6515272SSarah Sharp if (retval == 0) 2598c6515272SSarah Sharp update_address(udev, devnum); 2599c6515272SSarah Sharp } 26001da177e4SLinus Torvalds if (retval == 0) { 26014953d141SDavid Vrabel /* Device now using proper address. */ 26021da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 2603fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 26041da177e4SLinus Torvalds } 26051da177e4SLinus Torvalds return retval; 26061da177e4SLinus Torvalds } 26071da177e4SLinus Torvalds 26081da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 26091da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 26101da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 26111da177e4SLinus Torvalds * 26121da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 2613742120c6SMing Lei * usb_reset_and_verify_device), the caller must own the device lock. For a 26141da177e4SLinus Torvalds * newly detected device that is not accessible through any global 26151da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 26161da177e4SLinus Torvalds */ 26171da177e4SLinus Torvalds static int 26181da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 26191da177e4SLinus Torvalds int retry_counter) 26201da177e4SLinus Torvalds { 26214186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 26221da177e4SLinus Torvalds 26231da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 2624e7b77172SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 26251da177e4SLinus Torvalds int i, j, retval; 26261da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 26271da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 262883a07196SInaky Perez-Gonzalez char *speed, *type; 26294326ed0bSAlan Stern int devnum = udev->devnum; 26301da177e4SLinus Torvalds 26311da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 26321da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 26331da177e4SLinus Torvalds */ 26341da177e4SLinus Torvalds if (!hdev->parent) { 26351da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 26361da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 26371da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 26381da177e4SLinus Torvalds } 26391da177e4SLinus Torvalds 26401da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 26411da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 26421da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 26431da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 26441da177e4SLinus Torvalds 26454186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 26461da177e4SLinus Torvalds 2647e7b77172SSarah Sharp if ((hcd->driver->flags & HCD_USB3) && udev->config) { 2648e7b77172SSarah Sharp /* FIXME this will need special handling by the xHCI driver. */ 2649e7b77172SSarah Sharp dev_dbg(&udev->dev, 2650e7b77172SSarah Sharp "xHCI reset of configured device " 2651e7b77172SSarah Sharp "not supported yet.\n"); 2652e7b77172SSarah Sharp retval = -EINVAL; 2653e7b77172SSarah Sharp goto fail; 2654e7b77172SSarah Sharp } else if (!udev->config && oldspeed == USB_SPEED_SUPER) { 2655e7b77172SSarah Sharp /* Don't reset USB 3.0 devices during an initial setup */ 2656e7b77172SSarah Sharp usb_set_device_state(udev, USB_STATE_DEFAULT); 2657e7b77172SSarah Sharp } else { 26581da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 2659e7b77172SSarah Sharp /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ 26601da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 26611da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 26621da177e4SLinus Torvalds goto fail; 26631da177e4SLinus Torvalds /* success, speed is known */ 2664e7b77172SSarah Sharp } 26651da177e4SLinus Torvalds retval = -ENODEV; 26661da177e4SLinus Torvalds 26671da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 26681da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 26691da177e4SLinus Torvalds goto fail; 26701da177e4SLinus Torvalds } 26711da177e4SLinus Torvalds oldspeed = udev->speed; 26721da177e4SLinus Torvalds 26731da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 26741da177e4SLinus Torvalds * it's fixed size except for full speed devices. 26755bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 26765bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 26771da177e4SLinus Torvalds */ 26781da177e4SLinus Torvalds switch (udev->speed) { 26796b403b02SSarah Sharp case USB_SPEED_SUPER: 26805bb6e0aeSInaky Perez-Gonzalez case USB_SPEED_VARIABLE: /* fixed at 512 */ 2681551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); 26825bb6e0aeSInaky Perez-Gonzalez break; 26831da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 2684551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 26851da177e4SLinus Torvalds break; 26861da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 26871da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 26881da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 26891da177e4SLinus Torvalds * then correct our initial guess. 26901da177e4SLinus Torvalds */ 2691551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 26921da177e4SLinus Torvalds break; 26931da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 2694551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); 26951da177e4SLinus Torvalds break; 26961da177e4SLinus Torvalds default: 26971da177e4SLinus Torvalds goto fail; 26981da177e4SLinus Torvalds } 26991da177e4SLinus Torvalds 270083a07196SInaky Perez-Gonzalez type = ""; 270183a07196SInaky Perez-Gonzalez switch (udev->speed) { 27021da177e4SLinus Torvalds case USB_SPEED_LOW: speed = "low"; break; 27031da177e4SLinus Torvalds case USB_SPEED_FULL: speed = "full"; break; 27041da177e4SLinus Torvalds case USB_SPEED_HIGH: speed = "high"; break; 27056b403b02SSarah Sharp case USB_SPEED_SUPER: 27066b403b02SSarah Sharp speed = "super"; 27076b403b02SSarah Sharp break; 270883a07196SInaky Perez-Gonzalez case USB_SPEED_VARIABLE: 270983a07196SInaky Perez-Gonzalez speed = "variable"; 271083a07196SInaky Perez-Gonzalez type = "Wireless "; 271183a07196SInaky Perez-Gonzalez break; 27121da177e4SLinus Torvalds default: speed = "?"; break; 271383a07196SInaky Perez-Gonzalez } 2714c6515272SSarah Sharp if (udev->speed != USB_SPEED_SUPER) 271583a07196SInaky Perez-Gonzalez dev_info(&udev->dev, 271683a07196SInaky Perez-Gonzalez "%s %s speed %sUSB device using %s and address %d\n", 271783a07196SInaky Perez-Gonzalez (udev->config) ? "reset" : "new", speed, type, 27184326ed0bSAlan Stern udev->bus->controller->driver->name, devnum); 27191da177e4SLinus Torvalds 27201da177e4SLinus Torvalds /* Set up TT records, if needed */ 27211da177e4SLinus Torvalds if (hdev->tt) { 27221da177e4SLinus Torvalds udev->tt = hdev->tt; 27231da177e4SLinus Torvalds udev->ttport = hdev->ttport; 27241da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 27251da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 27261da177e4SLinus Torvalds udev->tt = &hub->tt; 27271da177e4SLinus Torvalds udev->ttport = port1; 27281da177e4SLinus Torvalds } 27291da177e4SLinus Torvalds 27301da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 27311da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 27321da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 27331da177e4SLinus Torvalds * Change it cautiously. 27341da177e4SLinus Torvalds * 27351da177e4SLinus Torvalds * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 27361da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 27371da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 27381da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 27391da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 27401da177e4SLinus Torvalds * value. 27411da177e4SLinus Torvalds */ 27421da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 2743c6515272SSarah Sharp /* 2744c6515272SSarah Sharp * An xHCI controller cannot send any packets to a device until 2745c6515272SSarah Sharp * a set address command successfully completes. 2746c6515272SSarah Sharp */ 2747c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) { 27481da177e4SLinus Torvalds struct usb_device_descriptor *buf; 27491da177e4SLinus Torvalds int r = 0; 27501da177e4SLinus Torvalds 27511da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 27521da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 27531da177e4SLinus Torvalds if (!buf) { 27541da177e4SLinus Torvalds retval = -ENOMEM; 27551da177e4SLinus Torvalds continue; 27561da177e4SLinus Torvalds } 27571da177e4SLinus Torvalds 2758b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 2759b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 2760b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 27611da177e4SLinus Torvalds */ 27621da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 27631da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 27641da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 27651da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 27661da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 27671da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 2768fd7c519dSJaroslav Kysela initial_descriptor_timeout); 27691da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 27705bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 27711da177e4SLinus Torvalds if (buf->bDescriptorType == 27721da177e4SLinus Torvalds USB_DT_DEVICE) { 27731da177e4SLinus Torvalds r = 0; 27741da177e4SLinus Torvalds break; 27751da177e4SLinus Torvalds } 27761da177e4SLinus Torvalds /* FALL THROUGH */ 27771da177e4SLinus Torvalds default: 27781da177e4SLinus Torvalds if (r == 0) 27791da177e4SLinus Torvalds r = -EPROTO; 27801da177e4SLinus Torvalds break; 27811da177e4SLinus Torvalds } 27821da177e4SLinus Torvalds if (r == 0) 27831da177e4SLinus Torvalds break; 27841da177e4SLinus Torvalds } 27851da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 27861da177e4SLinus Torvalds buf->bMaxPacketSize0; 27871da177e4SLinus Torvalds kfree(buf); 27881da177e4SLinus Torvalds 27891da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 27901da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 27911da177e4SLinus Torvalds goto fail; 27921da177e4SLinus Torvalds if (oldspeed != udev->speed) { 27931da177e4SLinus Torvalds dev_dbg(&udev->dev, 27941da177e4SLinus Torvalds "device reset changed speed!\n"); 27951da177e4SLinus Torvalds retval = -ENODEV; 27961da177e4SLinus Torvalds goto fail; 27971da177e4SLinus Torvalds } 27981da177e4SLinus Torvalds if (r) { 2799b9cef6c3SWu Fengguang dev_err(&udev->dev, 2800b9cef6c3SWu Fengguang "device descriptor read/64, error %d\n", 2801b9cef6c3SWu Fengguang r); 28021da177e4SLinus Torvalds retval = -EMSGSIZE; 28031da177e4SLinus Torvalds continue; 28041da177e4SLinus Torvalds } 28051da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 28061da177e4SLinus Torvalds } 28071da177e4SLinus Torvalds 28086c529cdcSInaky Perez-Gonzalez /* 28096c529cdcSInaky Perez-Gonzalez * If device is WUSB, we already assigned an 28106c529cdcSInaky Perez-Gonzalez * unauthorized address in the Connect Ack sequence; 28116c529cdcSInaky Perez-Gonzalez * authorization will assign the final address. 28126c529cdcSInaky Perez-Gonzalez */ 28136c529cdcSInaky Perez-Gonzalez if (udev->wusb == 0) { 28141da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 28154326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 28161da177e4SLinus Torvalds if (retval >= 0) 28171da177e4SLinus Torvalds break; 28181da177e4SLinus Torvalds msleep(200); 28191da177e4SLinus Torvalds } 28201da177e4SLinus Torvalds if (retval < 0) { 28211da177e4SLinus Torvalds dev_err(&udev->dev, 28221da177e4SLinus Torvalds "device not accepting address %d, error %d\n", 28234326ed0bSAlan Stern devnum, retval); 28241da177e4SLinus Torvalds goto fail; 28251da177e4SLinus Torvalds } 2826c6515272SSarah Sharp if (udev->speed == USB_SPEED_SUPER) { 2827c6515272SSarah Sharp devnum = udev->devnum; 2828c6515272SSarah Sharp dev_info(&udev->dev, 2829c6515272SSarah Sharp "%s SuperSpeed USB device using %s and address %d\n", 2830c6515272SSarah Sharp (udev->config) ? "reset" : "new", 2831c6515272SSarah Sharp udev->bus->controller->driver->name, devnum); 2832c6515272SSarah Sharp } 28331da177e4SLinus Torvalds 28341da177e4SLinus Torvalds /* cope with hardware quirkiness: 28351da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 28361da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 28371da177e4SLinus Torvalds */ 28381da177e4SLinus Torvalds msleep(10); 2839c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) 28401da177e4SLinus Torvalds break; 28416c529cdcSInaky Perez-Gonzalez } 28421da177e4SLinus Torvalds 28431da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 28441da177e4SLinus Torvalds if (retval < 8) { 2845b9cef6c3SWu Fengguang dev_err(&udev->dev, 2846b9cef6c3SWu Fengguang "device descriptor read/8, error %d\n", 2847b9cef6c3SWu Fengguang retval); 28481da177e4SLinus Torvalds if (retval >= 0) 28491da177e4SLinus Torvalds retval = -EMSGSIZE; 28501da177e4SLinus Torvalds } else { 28511da177e4SLinus Torvalds retval = 0; 28521da177e4SLinus Torvalds break; 28531da177e4SLinus Torvalds } 28541da177e4SLinus Torvalds } 28551da177e4SLinus Torvalds if (retval) 28561da177e4SLinus Torvalds goto fail; 28571da177e4SLinus Torvalds 28586b403b02SSarah Sharp if (udev->descriptor.bMaxPacketSize0 == 0xff || 28596b403b02SSarah Sharp udev->speed == USB_SPEED_SUPER) 28606b403b02SSarah Sharp i = 512; 28616b403b02SSarah Sharp else 28626b403b02SSarah Sharp i = udev->descriptor.bMaxPacketSize0; 28631da177e4SLinus Torvalds if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { 28641da177e4SLinus Torvalds if (udev->speed != USB_SPEED_FULL || 28651da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 28661da177e4SLinus Torvalds dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); 28671da177e4SLinus Torvalds retval = -EMSGSIZE; 28681da177e4SLinus Torvalds goto fail; 28691da177e4SLinus Torvalds } 28701da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 28711da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 2872fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 28731da177e4SLinus Torvalds } 28741da177e4SLinus Torvalds 28751da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 28761da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 2877b9cef6c3SWu Fengguang dev_err(&udev->dev, "device descriptor read/all, error %d\n", 2878b9cef6c3SWu Fengguang retval); 28791da177e4SLinus Torvalds if (retval >= 0) 28801da177e4SLinus Torvalds retval = -ENOMSG; 28811da177e4SLinus Torvalds goto fail; 28821da177e4SLinus Torvalds } 28831da177e4SLinus Torvalds 28841da177e4SLinus Torvalds retval = 0; 28851da177e4SLinus Torvalds 28861da177e4SLinus Torvalds fail: 28874326ed0bSAlan Stern if (retval) { 28881da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 28894953d141SDavid Vrabel update_address(udev, devnum); /* for disconnect processing */ 28904326ed0bSAlan Stern } 28914186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 28921da177e4SLinus Torvalds return retval; 28931da177e4SLinus Torvalds } 28941da177e4SLinus Torvalds 28951da177e4SLinus Torvalds static void 28961da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 28971da177e4SLinus Torvalds { 28981da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 28991da177e4SLinus Torvalds int status; 29001da177e4SLinus Torvalds 2901e94b1766SChristoph Lameter qual = kmalloc (sizeof *qual, GFP_KERNEL); 29021da177e4SLinus Torvalds if (qual == NULL) 29031da177e4SLinus Torvalds return; 29041da177e4SLinus Torvalds 29051da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 29061da177e4SLinus Torvalds qual, sizeof *qual); 29071da177e4SLinus Torvalds if (status == sizeof *qual) { 29081da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 29091da177e4SLinus Torvalds "connect to a high speed hub\n"); 29101da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 29111da177e4SLinus Torvalds if (hub->has_indicators) { 29121da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 2913c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 29141da177e4SLinus Torvalds } 29151da177e4SLinus Torvalds } 29161da177e4SLinus Torvalds kfree(qual); 29171da177e4SLinus Torvalds } 29181da177e4SLinus Torvalds 29191da177e4SLinus Torvalds static unsigned 29201da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 29211da177e4SLinus Torvalds { 29221da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 29231da177e4SLinus Torvalds int remaining; 292455c52718SAlan Stern int port1; 29251da177e4SLinus Torvalds 292655c52718SAlan Stern if (!hub->limited_power) 29271da177e4SLinus Torvalds return 0; 29281da177e4SLinus Torvalds 292955c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 293055c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 293155c52718SAlan Stern struct usb_device *udev = hdev->children[port1 - 1]; 293255c52718SAlan Stern int delta; 29331da177e4SLinus Torvalds 29341da177e4SLinus Torvalds if (!udev) 29351da177e4SLinus Torvalds continue; 29361da177e4SLinus Torvalds 293755c52718SAlan Stern /* Unconfigured devices may not use more than 100mA, 293855c52718SAlan Stern * or 8mA for OTG ports */ 29391da177e4SLinus Torvalds if (udev->actconfig) 294055c52718SAlan Stern delta = udev->actconfig->desc.bMaxPower * 2; 294155c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 294255c52718SAlan Stern delta = 100; 29431da177e4SLinus Torvalds else 294455c52718SAlan Stern delta = 8; 294555c52718SAlan Stern if (delta > hub->mA_per_port) 2946b9cef6c3SWu Fengguang dev_warn(&udev->dev, 2947b9cef6c3SWu Fengguang "%dmA is over %umA budget for port %d!\n", 294855c52718SAlan Stern delta, hub->mA_per_port, port1); 29491da177e4SLinus Torvalds remaining -= delta; 29501da177e4SLinus Torvalds } 29511da177e4SLinus Torvalds if (remaining < 0) { 295255c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 295355c52718SAlan Stern - remaining); 29541da177e4SLinus Torvalds remaining = 0; 29551da177e4SLinus Torvalds } 29561da177e4SLinus Torvalds return remaining; 29571da177e4SLinus Torvalds } 29581da177e4SLinus Torvalds 29591da177e4SLinus Torvalds /* Handle physical or logical connection change events. 29601da177e4SLinus Torvalds * This routine is called when: 29611da177e4SLinus Torvalds * a port connection-change occurs; 29621da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 2963742120c6SMing Lei * usb_reset_and_verify_device() encounters changed descriptors (as from 29641da177e4SLinus Torvalds * a firmware download) 29651da177e4SLinus Torvalds * caller already locked the hub 29661da177e4SLinus Torvalds */ 29671da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 29681da177e4SLinus Torvalds u16 portstatus, u16 portchange) 29691da177e4SLinus Torvalds { 29701da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 29711da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 297290da096eSBalaji Rao struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 297324618b0cSAlan Stern unsigned wHubCharacteristics = 297424618b0cSAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 29758808f00cSAlan Stern struct usb_device *udev; 29761da177e4SLinus Torvalds int status, i; 29771da177e4SLinus Torvalds 29781da177e4SLinus Torvalds dev_dbg (hub_dev, 29791da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 29801da177e4SLinus Torvalds port1, portstatus, portchange, portspeed (portstatus)); 29811da177e4SLinus Torvalds 29821da177e4SLinus Torvalds if (hub->has_indicators) { 29831da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 29841da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 29851da177e4SLinus Torvalds } 29861da177e4SLinus Torvalds 29871da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 29881da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 29891da177e4SLinus Torvalds if (hdev->bus->is_b_host) 299024618b0cSAlan Stern portchange &= ~(USB_PORT_STAT_C_CONNECTION | 299124618b0cSAlan Stern USB_PORT_STAT_C_ENABLE); 29921da177e4SLinus Torvalds #endif 29931da177e4SLinus Torvalds 29948808f00cSAlan Stern /* Try to resuscitate an existing device */ 29958808f00cSAlan Stern udev = hdev->children[port1-1]; 29968808f00cSAlan Stern if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && 29978808f00cSAlan Stern udev->state != USB_STATE_NOTATTACHED) { 29988808f00cSAlan Stern usb_lock_device(udev); 29998808f00cSAlan Stern if (portstatus & USB_PORT_STAT_ENABLE) { 30008808f00cSAlan Stern status = 0; /* Nothing to do */ 30018808f00cSAlan Stern 30028808f00cSAlan Stern #ifdef CONFIG_USB_SUSPEND 30035257d97aSAlan Stern } else if (udev->state == USB_STATE_SUSPENDED && 30045257d97aSAlan Stern udev->persist_enabled) { 30058808f00cSAlan Stern /* For a suspended device, treat this as a 30068808f00cSAlan Stern * remote wakeup event. 30078808f00cSAlan Stern */ 30088808f00cSAlan Stern status = remote_wakeup(udev); 30098808f00cSAlan Stern #endif 30108808f00cSAlan Stern 30118808f00cSAlan Stern } else { 30125257d97aSAlan Stern status = -ENODEV; /* Don't resuscitate */ 30138808f00cSAlan Stern } 30148808f00cSAlan Stern usb_unlock_device(udev); 30158808f00cSAlan Stern 30168808f00cSAlan Stern if (status == 0) { 30178808f00cSAlan Stern clear_bit(port1, hub->change_bits); 30188808f00cSAlan Stern return; 30198808f00cSAlan Stern } 30208808f00cSAlan Stern } 30218808f00cSAlan Stern 302224618b0cSAlan Stern /* Disconnect any existing devices under this port */ 30238808f00cSAlan Stern if (udev) 302424618b0cSAlan Stern usb_disconnect(&hdev->children[port1-1]); 302524618b0cSAlan Stern clear_bit(port1, hub->change_bits); 302624618b0cSAlan Stern 3027253e0572SAlan Stern /* We can forget about a "removed" device when there's a physical 3028253e0572SAlan Stern * disconnect or the connect status changes. 3029253e0572SAlan Stern */ 3030253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 3031253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 3032253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 3033253e0572SAlan Stern 30345257d97aSAlan Stern if (portchange & (USB_PORT_STAT_C_CONNECTION | 30355257d97aSAlan Stern USB_PORT_STAT_C_ENABLE)) { 30365257d97aSAlan Stern status = hub_port_debounce(hub, port1); 30375257d97aSAlan Stern if (status < 0) { 30385257d97aSAlan Stern if (printk_ratelimit()) 30395257d97aSAlan Stern dev_err(hub_dev, "connect-debounce failed, " 30405257d97aSAlan Stern "port %d disabled\n", port1); 30415257d97aSAlan Stern portstatus &= ~USB_PORT_STAT_CONNECTION; 30425257d97aSAlan Stern } else { 30435257d97aSAlan Stern portstatus = status; 30445257d97aSAlan Stern } 30455257d97aSAlan Stern } 30465257d97aSAlan Stern 3047253e0572SAlan Stern /* Return now if debouncing failed or nothing is connected or 3048253e0572SAlan Stern * the device was "removed". 3049253e0572SAlan Stern */ 3050253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 3051253e0572SAlan Stern test_bit(port1, hub->removed_bits)) { 30521da177e4SLinus Torvalds 30531da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 305474ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 30551da177e4SLinus Torvalds && !(portstatus & (1 << USB_PORT_FEAT_POWER))) 30561da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 30571da177e4SLinus Torvalds 30581da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 30591da177e4SLinus Torvalds goto done; 30601da177e4SLinus Torvalds return; 30611da177e4SLinus Torvalds } 30621da177e4SLinus Torvalds 30631da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 30641da177e4SLinus Torvalds 30651da177e4SLinus Torvalds /* reallocate for each attempt, since references 30661da177e4SLinus Torvalds * to the previous one can escape in various ways 30671da177e4SLinus Torvalds */ 30681da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 30691da177e4SLinus Torvalds if (!udev) { 30701da177e4SLinus Torvalds dev_err (hub_dev, 30711da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 30721da177e4SLinus Torvalds port1); 30731da177e4SLinus Torvalds goto done; 30741da177e4SLinus Torvalds } 30751da177e4SLinus Torvalds 30761da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 307755c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 3078b6956ffaSAlan Stern udev->level = hdev->level + 1; 30798af548dcSInaky Perez-Gonzalez udev->wusb = hub_is_wusb(hub); 30801da177e4SLinus Torvalds 3081e7b77172SSarah Sharp /* 3082e7b77172SSarah Sharp * USB 3.0 devices are reset automatically before the connect 3083e7b77172SSarah Sharp * port status change appears, and the root hub port status 3084e7b77172SSarah Sharp * shows the correct speed. We also get port change 3085e7b77172SSarah Sharp * notifications for USB 3.0 devices from the USB 3.0 portion of 3086e7b77172SSarah Sharp * an external USB 3.0 hub, but this isn't handled correctly yet 3087e7b77172SSarah Sharp * FIXME. 3088e7b77172SSarah Sharp */ 3089e7b77172SSarah Sharp 3090e7b77172SSarah Sharp if (!(hcd->driver->flags & HCD_USB3)) 3091e7b77172SSarah Sharp udev->speed = USB_SPEED_UNKNOWN; 3092e7b77172SSarah Sharp else if ((hdev->parent == NULL) && 3093e7b77172SSarah Sharp (portstatus & (1 << USB_PORT_FEAT_SUPERSPEED))) 3094e7b77172SSarah Sharp udev->speed = USB_SPEED_SUPER; 3095e7b77172SSarah Sharp else 3096e7b77172SSarah Sharp udev->speed = USB_SPEED_UNKNOWN; 3097e7b77172SSarah Sharp 3098c6515272SSarah Sharp /* 3099c6515272SSarah Sharp * xHCI needs to issue an address device command later 3100c6515272SSarah Sharp * in the hub_port_init sequence for SS/HS/FS/LS devices. 3101c6515272SSarah Sharp */ 3102c6515272SSarah Sharp if (!(hcd->driver->flags & HCD_USB3)) { 3103c6515272SSarah Sharp /* set the address */ 3104c6515272SSarah Sharp choose_address(udev); 3105c6515272SSarah Sharp if (udev->devnum <= 0) { 3106c6515272SSarah Sharp status = -ENOTCONN; /* Don't retry */ 3107c6515272SSarah Sharp goto loop; 3108c6515272SSarah Sharp } 3109c6515272SSarah Sharp } 3110c6515272SSarah Sharp 3111e7b77172SSarah Sharp /* reset (non-USB 3.0 devices) and get descriptor */ 31121da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 31131da177e4SLinus Torvalds if (status < 0) 31141da177e4SLinus Torvalds goto loop; 31151da177e4SLinus Torvalds 31161da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 31171da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 31181da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 31191da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 31201da177e4SLinus Torvalds * on the parent. 31211da177e4SLinus Torvalds */ 31221da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 312355c52718SAlan Stern && udev->bus_mA <= 100) { 31241da177e4SLinus Torvalds u16 devstat; 31251da177e4SLinus Torvalds 31261da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 31271da177e4SLinus Torvalds &devstat); 312855c52718SAlan Stern if (status < 2) { 31291da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 31301da177e4SLinus Torvalds goto loop_disable; 31311da177e4SLinus Torvalds } 313255c52718SAlan Stern le16_to_cpus(&devstat); 31331da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 31341da177e4SLinus Torvalds dev_err(&udev->dev, 31351da177e4SLinus Torvalds "can't connect bus-powered hub " 31361da177e4SLinus Torvalds "to this port\n"); 31371da177e4SLinus Torvalds if (hub->has_indicators) { 31381da177e4SLinus Torvalds hub->indicator[port1-1] = 31391da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 3140c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 31411da177e4SLinus Torvalds } 31421da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 31431da177e4SLinus Torvalds goto loop_disable; 31441da177e4SLinus Torvalds } 31451da177e4SLinus Torvalds } 31461da177e4SLinus Torvalds 31471da177e4SLinus Torvalds /* check for devices running slower than they could */ 31481da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 31491da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 31501da177e4SLinus Torvalds && highspeed_hubs != 0) 31511da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 31521da177e4SLinus Torvalds 31531da177e4SLinus Torvalds /* Store the parent's children[] pointer. At this point 31541da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 31551da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 31561da177e4SLinus Torvalds */ 31571da177e4SLinus Torvalds status = 0; 31581da177e4SLinus Torvalds 31591da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 31601da177e4SLinus Torvalds * been disconnected; we would race with the 31611da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 31621da177e4SLinus Torvalds */ 31631da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 31641da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 31651da177e4SLinus Torvalds status = -ENOTCONN; 31661da177e4SLinus Torvalds else 31671da177e4SLinus Torvalds hdev->children[port1-1] = udev; 31681da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 31691da177e4SLinus Torvalds 31701da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 31711da177e4SLinus Torvalds if (!status) { 31721da177e4SLinus Torvalds status = usb_new_device(udev); 31731da177e4SLinus Torvalds if (status) { 31741da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 31751da177e4SLinus Torvalds hdev->children[port1-1] = NULL; 31761da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 31771da177e4SLinus Torvalds } 31781da177e4SLinus Torvalds } 31791da177e4SLinus Torvalds 31801da177e4SLinus Torvalds if (status) 31811da177e4SLinus Torvalds goto loop_disable; 31821da177e4SLinus Torvalds 31831da177e4SLinus Torvalds status = hub_power_remaining(hub); 31841da177e4SLinus Torvalds if (status) 318555c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 31861da177e4SLinus Torvalds 31871da177e4SLinus Torvalds return; 31881da177e4SLinus Torvalds 31891da177e4SLinus Torvalds loop_disable: 31901da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 31911da177e4SLinus Torvalds loop: 3192fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 31931da177e4SLinus Torvalds release_address(udev); 31941da177e4SLinus Torvalds usb_put_dev(udev); 3195ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 31961da177e4SLinus Torvalds break; 31971da177e4SLinus Torvalds } 31983a31155cSAlan Stern if (hub->hdev->parent || 31993a31155cSAlan Stern !hcd->driver->port_handed_over || 32003a31155cSAlan Stern !(hcd->driver->port_handed_over)(hcd, port1)) 32013a31155cSAlan Stern dev_err(hub_dev, "unable to enumerate USB device on port %d\n", 32023a31155cSAlan Stern port1); 32031da177e4SLinus Torvalds 32041da177e4SLinus Torvalds done: 32051da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 320690da096eSBalaji Rao if (hcd->driver->relinquish_port && !hub->hdev->parent) 320790da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 32081da177e4SLinus Torvalds } 32091da177e4SLinus Torvalds 32101da177e4SLinus Torvalds static void hub_events(void) 32111da177e4SLinus Torvalds { 32121da177e4SLinus Torvalds struct list_head *tmp; 32131da177e4SLinus Torvalds struct usb_device *hdev; 32141da177e4SLinus Torvalds struct usb_interface *intf; 32151da177e4SLinus Torvalds struct usb_hub *hub; 32161da177e4SLinus Torvalds struct device *hub_dev; 32171da177e4SLinus Torvalds u16 hubstatus; 32181da177e4SLinus Torvalds u16 hubchange; 32191da177e4SLinus Torvalds u16 portstatus; 32201da177e4SLinus Torvalds u16 portchange; 32211da177e4SLinus Torvalds int i, ret; 32221da177e4SLinus Torvalds int connect_change; 32231da177e4SLinus Torvalds 32241da177e4SLinus Torvalds /* 32251da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 32261da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 32271da177e4SLinus Torvalds * safe since we delete the hub from the event list. 32281da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 32291da177e4SLinus Torvalds */ 32301da177e4SLinus Torvalds while (1) { 32311da177e4SLinus Torvalds 32321da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 32331da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 32341da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 32351da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 32361da177e4SLinus Torvalds break; 32371da177e4SLinus Torvalds } 32381da177e4SLinus Torvalds 32391da177e4SLinus Torvalds tmp = hub_event_list.next; 32401da177e4SLinus Torvalds list_del_init(tmp); 32411da177e4SLinus Torvalds 32421da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 3243e8054854SAlan Stern kref_get(&hub->kref); 3244e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 32451da177e4SLinus Torvalds 3246e8054854SAlan Stern hdev = hub->hdev; 3247e8054854SAlan Stern hub_dev = hub->intfdev; 3248e8054854SAlan Stern intf = to_usb_interface(hub_dev); 324940f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 32501da177e4SLinus Torvalds hdev->state, hub->descriptor 32511da177e4SLinus Torvalds ? hub->descriptor->bNbrPorts 32521da177e4SLinus Torvalds : 0, 32531da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 32541da177e4SLinus Torvalds (u16) hub->change_bits[0], 325540f122f3SAlan Stern (u16) hub->event_bits[0]); 32561da177e4SLinus Torvalds 32571da177e4SLinus Torvalds /* Lock the device, then check to see if we were 32581da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 325906b84e8aSAlan Stern usb_lock_device(hdev); 3260e8054854SAlan Stern if (unlikely(hub->disconnected)) 32618e4ceb38SAlan Stern goto loop2; 32621da177e4SLinus Torvalds 32631da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 32641da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 32657de18d8bSAlan Stern hub->error = -ENODEV; 32664330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 32671da177e4SLinus Torvalds goto loop; 32681da177e4SLinus Torvalds } 32691da177e4SLinus Torvalds 327040f122f3SAlan Stern /* Autoresume */ 327140f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 327240f122f3SAlan Stern if (ret) { 327340f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 32741da177e4SLinus Torvalds goto loop; 327540f122f3SAlan Stern } 327640f122f3SAlan Stern 327740f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 327840f122f3SAlan Stern if (hub->quiescing) 327940f122f3SAlan Stern goto loop_autopm; 32801da177e4SLinus Torvalds 32811da177e4SLinus Torvalds if (hub->error) { 32821da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 32831da177e4SLinus Torvalds hub->error); 32841da177e4SLinus Torvalds 3285742120c6SMing Lei ret = usb_reset_device(hdev); 32861da177e4SLinus Torvalds if (ret) { 32871da177e4SLinus Torvalds dev_dbg (hub_dev, 32881da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 328940f122f3SAlan Stern goto loop_autopm; 32901da177e4SLinus Torvalds } 32911da177e4SLinus Torvalds 32921da177e4SLinus Torvalds hub->nerrors = 0; 32931da177e4SLinus Torvalds hub->error = 0; 32941da177e4SLinus Torvalds } 32951da177e4SLinus Torvalds 32961da177e4SLinus Torvalds /* deal with port status changes */ 32971da177e4SLinus Torvalds for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { 32981da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 32991da177e4SLinus Torvalds continue; 33001da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 33011da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 33026ee0b270SAlan Stern !connect_change) 33031da177e4SLinus Torvalds continue; 33041da177e4SLinus Torvalds 33051da177e4SLinus Torvalds ret = hub_port_status(hub, i, 33061da177e4SLinus Torvalds &portstatus, &portchange); 33071da177e4SLinus Torvalds if (ret < 0) 33081da177e4SLinus Torvalds continue; 33091da177e4SLinus Torvalds 33101da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 33111da177e4SLinus Torvalds clear_port_feature(hdev, i, 33121da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 33131da177e4SLinus Torvalds connect_change = 1; 33141da177e4SLinus Torvalds } 33151da177e4SLinus Torvalds 33161da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 33171da177e4SLinus Torvalds if (!connect_change) 33181da177e4SLinus Torvalds dev_dbg (hub_dev, 33191da177e4SLinus Torvalds "port %d enable change, " 33201da177e4SLinus Torvalds "status %08x\n", 33211da177e4SLinus Torvalds i, portstatus); 33221da177e4SLinus Torvalds clear_port_feature(hdev, i, 33231da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 33241da177e4SLinus Torvalds 33251da177e4SLinus Torvalds /* 33261da177e4SLinus Torvalds * EM interference sometimes causes badly 33271da177e4SLinus Torvalds * shielded USB devices to be shutdown by 33281da177e4SLinus Torvalds * the hub, this hack enables them again. 33291da177e4SLinus Torvalds * Works at least with mouse driver. 33301da177e4SLinus Torvalds */ 33311da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 33321da177e4SLinus Torvalds && !connect_change 33331da177e4SLinus Torvalds && hdev->children[i-1]) { 33341da177e4SLinus Torvalds dev_err (hub_dev, 33351da177e4SLinus Torvalds "port %i " 33361da177e4SLinus Torvalds "disabled by hub (EMI?), " 33371da177e4SLinus Torvalds "re-enabling...\n", 33381da177e4SLinus Torvalds i); 33391da177e4SLinus Torvalds connect_change = 1; 33401da177e4SLinus Torvalds } 33411da177e4SLinus Torvalds } 33421da177e4SLinus Torvalds 33431da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_SUSPEND) { 33448808f00cSAlan Stern struct usb_device *udev; 33458808f00cSAlan Stern 33461da177e4SLinus Torvalds clear_port_feature(hdev, i, 33471da177e4SLinus Torvalds USB_PORT_FEAT_C_SUSPEND); 33488808f00cSAlan Stern udev = hdev->children[i-1]; 33498808f00cSAlan Stern if (udev) { 335049d0f078SAlan Stern /* TRSMRCY = 10 msec */ 335149d0f078SAlan Stern msleep(10); 335249d0f078SAlan Stern 33538808f00cSAlan Stern usb_lock_device(udev); 33541da177e4SLinus Torvalds ret = remote_wakeup(hdev-> 33551da177e4SLinus Torvalds children[i-1]); 33568808f00cSAlan Stern usb_unlock_device(udev); 33571da177e4SLinus Torvalds if (ret < 0) 33581da177e4SLinus Torvalds connect_change = 1; 33591da177e4SLinus Torvalds } else { 33601da177e4SLinus Torvalds ret = -ENODEV; 33611da177e4SLinus Torvalds hub_port_disable(hub, i, 1); 33621da177e4SLinus Torvalds } 33631da177e4SLinus Torvalds dev_dbg (hub_dev, 33641da177e4SLinus Torvalds "resume on port %d, status %d\n", 33651da177e4SLinus Torvalds i, ret); 33661da177e4SLinus Torvalds } 33671da177e4SLinus Torvalds 33681da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 33691da177e4SLinus Torvalds dev_err (hub_dev, 33701da177e4SLinus Torvalds "over-current change on port %d\n", 33711da177e4SLinus Torvalds i); 33721da177e4SLinus Torvalds clear_port_feature(hdev, i, 33731da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 33748520f380SAlan Stern hub_power_on(hub, true); 33751da177e4SLinus Torvalds } 33761da177e4SLinus Torvalds 33771da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 33781da177e4SLinus Torvalds dev_dbg (hub_dev, 33791da177e4SLinus Torvalds "reset change on port %d\n", 33801da177e4SLinus Torvalds i); 33811da177e4SLinus Torvalds clear_port_feature(hdev, i, 33821da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 33831da177e4SLinus Torvalds } 33841da177e4SLinus Torvalds 33851da177e4SLinus Torvalds if (connect_change) 33861da177e4SLinus Torvalds hub_port_connect_change(hub, i, 33871da177e4SLinus Torvalds portstatus, portchange); 33881da177e4SLinus Torvalds } /* end for i */ 33891da177e4SLinus Torvalds 33901da177e4SLinus Torvalds /* deal with hub status changes */ 33911da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 33921da177e4SLinus Torvalds ; /* do nothing */ 33931da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 33941da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 33951da177e4SLinus Torvalds else { 33961da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 33971da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 33981da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 339955c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 340055c52718SAlan Stern /* FIXME: Is this always true? */ 340155c52718SAlan Stern hub->limited_power = 1; 3402403fae78Sjidong xiao else 3403403fae78Sjidong xiao hub->limited_power = 0; 34041da177e4SLinus Torvalds } 34051da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 34061da177e4SLinus Torvalds dev_dbg (hub_dev, "overcurrent change\n"); 34071da177e4SLinus Torvalds msleep(500); /* Cool down */ 34081da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 34098520f380SAlan Stern hub_power_on(hub, true); 34101da177e4SLinus Torvalds } 34111da177e4SLinus Torvalds } 34121da177e4SLinus Torvalds 341340f122f3SAlan Stern loop_autopm: 34148e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface() above */ 34158e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 34161da177e4SLinus Torvalds loop: 34178e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface_no_resume() in 34188e4ceb38SAlan Stern * kick_khubd() and allow autosuspend. 34198e4ceb38SAlan Stern */ 34208e4ceb38SAlan Stern usb_autopm_put_interface(intf); 34218e4ceb38SAlan Stern loop2: 34221da177e4SLinus Torvalds usb_unlock_device(hdev); 3423e8054854SAlan Stern kref_put(&hub->kref, hub_release); 34241da177e4SLinus Torvalds 34251da177e4SLinus Torvalds } /* end while (1) */ 34261da177e4SLinus Torvalds } 34271da177e4SLinus Torvalds 34281da177e4SLinus Torvalds static int hub_thread(void *__unused) 34291da177e4SLinus Torvalds { 34303bb1af52SAlan Stern /* khubd needs to be freezable to avoid intefering with USB-PERSIST 34313bb1af52SAlan Stern * port handover. Otherwise it might see that a full-speed device 34323bb1af52SAlan Stern * was gone before the EHCI controller had handed its port over to 34333bb1af52SAlan Stern * the companion full-speed controller. 34343bb1af52SAlan Stern */ 343583144186SRafael J. Wysocki set_freezable(); 34363bb1af52SAlan Stern 34371da177e4SLinus Torvalds do { 34381da177e4SLinus Torvalds hub_events(); 3439e42837bcSRafael J. Wysocki wait_event_freezable(khubd_wait, 34409c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 34419c8d6178Sakpm@osdl.org kthread_should_stop()); 34429c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 34431da177e4SLinus Torvalds 34441da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 34459c8d6178Sakpm@osdl.org return 0; 34461da177e4SLinus Torvalds } 34471da177e4SLinus Torvalds 34481da177e4SLinus Torvalds static struct usb_device_id hub_id_table [] = { 34491da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 34501da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 34511da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 34521da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 34531da177e4SLinus Torvalds { } /* Terminating entry */ 34541da177e4SLinus Torvalds }; 34551da177e4SLinus Torvalds 34561da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 34571da177e4SLinus Torvalds 34581da177e4SLinus Torvalds static struct usb_driver hub_driver = { 34591da177e4SLinus Torvalds .name = "hub", 34601da177e4SLinus Torvalds .probe = hub_probe, 34611da177e4SLinus Torvalds .disconnect = hub_disconnect, 34621da177e4SLinus Torvalds .suspend = hub_suspend, 34631da177e4SLinus Torvalds .resume = hub_resume, 3464f07600cfSAlan Stern .reset_resume = hub_reset_resume, 34657de18d8bSAlan Stern .pre_reset = hub_pre_reset, 34667de18d8bSAlan Stern .post_reset = hub_post_reset, 34671da177e4SLinus Torvalds .ioctl = hub_ioctl, 34681da177e4SLinus Torvalds .id_table = hub_id_table, 346940f122f3SAlan Stern .supports_autosuspend = 1, 34701da177e4SLinus Torvalds }; 34711da177e4SLinus Torvalds 34721da177e4SLinus Torvalds int usb_hub_init(void) 34731da177e4SLinus Torvalds { 34741da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 34751da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 34761da177e4SLinus Torvalds usbcore_name); 34771da177e4SLinus Torvalds return -1; 34781da177e4SLinus Torvalds } 34791da177e4SLinus Torvalds 34809c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 34819c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 34821da177e4SLinus Torvalds return 0; 34831da177e4SLinus Torvalds 34841da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 34851da177e4SLinus Torvalds usb_deregister(&hub_driver); 34861da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 34871da177e4SLinus Torvalds 34881da177e4SLinus Torvalds return -1; 34891da177e4SLinus Torvalds } 34901da177e4SLinus Torvalds 34911da177e4SLinus Torvalds void usb_hub_cleanup(void) 34921da177e4SLinus Torvalds { 34939c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 34941da177e4SLinus Torvalds 34951da177e4SLinus Torvalds /* 34961da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 34971da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 34981da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 34991da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 35001da177e4SLinus Torvalds * individual hub resources. -greg 35011da177e4SLinus Torvalds */ 35021da177e4SLinus Torvalds usb_deregister(&hub_driver); 35031da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 35041da177e4SLinus Torvalds 3505eb764c4bSAlan Stern static int descriptors_changed(struct usb_device *udev, 3506eb764c4bSAlan Stern struct usb_device_descriptor *old_device_descriptor) 35071da177e4SLinus Torvalds { 3508eb764c4bSAlan Stern int changed = 0; 35091da177e4SLinus Torvalds unsigned index; 3510eb764c4bSAlan Stern unsigned serial_len = 0; 3511eb764c4bSAlan Stern unsigned len; 3512eb764c4bSAlan Stern unsigned old_length; 3513eb764c4bSAlan Stern int length; 3514eb764c4bSAlan Stern char *buf; 35151da177e4SLinus Torvalds 3516eb764c4bSAlan Stern if (memcmp(&udev->descriptor, old_device_descriptor, 3517eb764c4bSAlan Stern sizeof(*old_device_descriptor)) != 0) 3518eb764c4bSAlan Stern return 1; 3519eb764c4bSAlan Stern 3520eb764c4bSAlan Stern /* Since the idVendor, idProduct, and bcdDevice values in the 3521eb764c4bSAlan Stern * device descriptor haven't changed, we will assume the 3522eb764c4bSAlan Stern * Manufacturer and Product strings haven't changed either. 3523eb764c4bSAlan Stern * But the SerialNumber string could be different (e.g., a 3524eb764c4bSAlan Stern * different flash card of the same brand). 3525eb764c4bSAlan Stern */ 3526eb764c4bSAlan Stern if (udev->serial) 3527eb764c4bSAlan Stern serial_len = strlen(udev->serial) + 1; 3528eb764c4bSAlan Stern 3529eb764c4bSAlan Stern len = serial_len; 35301da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 3531eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 3532eb764c4bSAlan Stern len = max(len, old_length); 35331da177e4SLinus Torvalds } 3534eb764c4bSAlan Stern 35350cc1a51fSOliver Neukum buf = kmalloc(len, GFP_NOIO); 35361da177e4SLinus Torvalds if (buf == NULL) { 35371da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 35381da177e4SLinus Torvalds /* assume the worst */ 35391da177e4SLinus Torvalds return 1; 35401da177e4SLinus Torvalds } 35411da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 3542eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 35431da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 35441da177e4SLinus Torvalds old_length); 3545eb764c4bSAlan Stern if (length != old_length) { 35461da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 35471da177e4SLinus Torvalds index, length); 3548eb764c4bSAlan Stern changed = 1; 35491da177e4SLinus Torvalds break; 35501da177e4SLinus Torvalds } 35511da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 35521da177e4SLinus Torvalds != 0) { 35531da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 3554eb764c4bSAlan Stern index, 3555eb764c4bSAlan Stern ((struct usb_config_descriptor *) buf)-> 3556eb764c4bSAlan Stern bConfigurationValue); 3557eb764c4bSAlan Stern changed = 1; 35581da177e4SLinus Torvalds break; 35591da177e4SLinus Torvalds } 35601da177e4SLinus Torvalds } 3561eb764c4bSAlan Stern 3562eb764c4bSAlan Stern if (!changed && serial_len) { 3563eb764c4bSAlan Stern length = usb_string(udev, udev->descriptor.iSerialNumber, 3564eb764c4bSAlan Stern buf, serial_len); 3565eb764c4bSAlan Stern if (length + 1 != serial_len) { 3566eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string error %d\n", 3567eb764c4bSAlan Stern length); 3568eb764c4bSAlan Stern changed = 1; 3569eb764c4bSAlan Stern } else if (memcmp(buf, udev->serial, length) != 0) { 3570eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string changed\n"); 3571eb764c4bSAlan Stern changed = 1; 3572eb764c4bSAlan Stern } 3573eb764c4bSAlan Stern } 3574eb764c4bSAlan Stern 35751da177e4SLinus Torvalds kfree(buf); 3576eb764c4bSAlan Stern return changed; 35771da177e4SLinus Torvalds } 35781da177e4SLinus Torvalds 35791da177e4SLinus Torvalds /** 3580742120c6SMing Lei * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device 35811da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 35821da177e4SLinus Torvalds * 358379efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 358479efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 3585742120c6SMing Lei * Use usb_reset_device() instead. 35861da177e4SLinus Torvalds * 35871da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 35881da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 35891da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 35901da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 35911da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 35921da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 35931da177e4SLinus Torvalds * re-enumerated and probed all over again. 35941da177e4SLinus Torvalds * 35951da177e4SLinus Torvalds * Returns 0 if the reset succeeded, -ENODEV if the device has been 35961da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 35971da177e4SLinus Torvalds * if the reset wasn't even attempted. 35981da177e4SLinus Torvalds * 35991da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 36001da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 36011da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 36021da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 36036bc6cff5SAlan Stern * 36046bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 36056bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 36066bc6cff5SAlan Stern * holding the device lock because these tasks should always call 36076bc6cff5SAlan Stern * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. 36081da177e4SLinus Torvalds */ 3609742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev) 36101da177e4SLinus Torvalds { 36111da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 36121da177e4SLinus Torvalds struct usb_hub *parent_hub; 36133f0479e0SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 36141da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 361512c3da34SAlan Stern int i, ret = 0; 361612c3da34SAlan Stern int port1 = udev->portnum; 36171da177e4SLinus Torvalds 36181da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 36191da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 36201da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 36211da177e4SLinus Torvalds udev->state); 36221da177e4SLinus Torvalds return -EINVAL; 36231da177e4SLinus Torvalds } 36241da177e4SLinus Torvalds 36251da177e4SLinus Torvalds if (!parent_hdev) { 36261da177e4SLinus Torvalds /* this requires hcd-specific logic; see OHCI hc_restart() */ 3627441b62c1SHarvey Harrison dev_dbg(&udev->dev, "%s for root hub!\n", __func__); 36281da177e4SLinus Torvalds return -EISDIR; 36291da177e4SLinus Torvalds } 36301da177e4SLinus Torvalds parent_hub = hdev_to_hub(parent_hdev); 36311da177e4SLinus Torvalds 36321da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 36331da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 36341da177e4SLinus Torvalds 36351da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 36361da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 3637fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 36381da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 3639dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 36401da177e4SLinus Torvalds break; 36411da177e4SLinus Torvalds } 36421da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 3643d5cbad4bSAlan Stern 36441da177e4SLinus Torvalds if (ret < 0) 36451da177e4SLinus Torvalds goto re_enumerate; 36461da177e4SLinus Torvalds 36471da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 3648eb764c4bSAlan Stern if (descriptors_changed(udev, &descriptor)) { 36491da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 36501da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 36511da177e4SLinus Torvalds goto re_enumerate; 36521da177e4SLinus Torvalds } 36531da177e4SLinus Torvalds 36544fe0387aSAlan Stern /* Restore the device's previous configuration */ 36551da177e4SLinus Torvalds if (!udev->actconfig) 36561da177e4SLinus Torvalds goto done; 36573f0479e0SSarah Sharp 36583f0479e0SSarah Sharp mutex_lock(&hcd->bandwidth_mutex); 36593f0479e0SSarah Sharp ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); 36603f0479e0SSarah Sharp if (ret < 0) { 36613f0479e0SSarah Sharp dev_warn(&udev->dev, 36623f0479e0SSarah Sharp "Busted HC? Not enough HCD resources for " 36633f0479e0SSarah Sharp "old configuration.\n"); 36643f0479e0SSarah Sharp mutex_unlock(&hcd->bandwidth_mutex); 36653f0479e0SSarah Sharp goto re_enumerate; 36663f0479e0SSarah Sharp } 36671da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 36681da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 36691da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 36701da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 36711da177e4SLinus Torvalds if (ret < 0) { 36721da177e4SLinus Torvalds dev_err(&udev->dev, 36731da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 36741da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 36753f0479e0SSarah Sharp mutex_unlock(&hcd->bandwidth_mutex); 36761da177e4SLinus Torvalds goto re_enumerate; 36771da177e4SLinus Torvalds } 36783f0479e0SSarah Sharp mutex_unlock(&hcd->bandwidth_mutex); 36791da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 36801da177e4SLinus Torvalds 36814fe0387aSAlan Stern /* Put interfaces back into the same altsettings as before. 36824fe0387aSAlan Stern * Don't bother to send the Set-Interface request for interfaces 36834fe0387aSAlan Stern * that were already in altsetting 0; besides being unnecessary, 36844fe0387aSAlan Stern * many devices can't handle it. Instead just reset the host-side 36854fe0387aSAlan Stern * endpoint state. 36864fe0387aSAlan Stern */ 36871da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 36883f0479e0SSarah Sharp struct usb_host_config *config = udev->actconfig; 36893f0479e0SSarah Sharp struct usb_interface *intf = config->interface[i]; 36901da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 36911da177e4SLinus Torvalds 36921da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 36934fe0387aSAlan Stern if (desc->bAlternateSetting == 0) { 36944fe0387aSAlan Stern usb_disable_interface(udev, intf, true); 36954fe0387aSAlan Stern usb_enable_interface(udev, intf, true); 36964fe0387aSAlan Stern ret = 0; 36974fe0387aSAlan Stern } else { 36983f0479e0SSarah Sharp /* We've just reset the device, so it will think alt 36993f0479e0SSarah Sharp * setting 0 is installed. For usb_set_interface() to 37003f0479e0SSarah Sharp * work properly, we need to set the current alternate 37013f0479e0SSarah Sharp * interface setting to 0 (or the first alt setting, if 37023f0479e0SSarah Sharp * the device doesn't have alt setting 0). 37033f0479e0SSarah Sharp */ 37043f0479e0SSarah Sharp intf->cur_altsetting = 37053f0479e0SSarah Sharp usb_find_alt_setting(config, i, 0); 37063f0479e0SSarah Sharp if (!intf->cur_altsetting) 37073f0479e0SSarah Sharp intf->cur_altsetting = 37083f0479e0SSarah Sharp &config->intf_cache[i]->altsetting[0]; 37091da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 37101da177e4SLinus Torvalds desc->bAlternateSetting); 37114fe0387aSAlan Stern } 37121da177e4SLinus Torvalds if (ret < 0) { 37131da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 37141da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 37151da177e4SLinus Torvalds desc->bInterfaceNumber, 37161da177e4SLinus Torvalds desc->bAlternateSetting, 37171da177e4SLinus Torvalds ret); 37181da177e4SLinus Torvalds goto re_enumerate; 37191da177e4SLinus Torvalds } 37201da177e4SLinus Torvalds } 37211da177e4SLinus Torvalds 37221da177e4SLinus Torvalds done: 37231da177e4SLinus Torvalds return 0; 37241da177e4SLinus Torvalds 37251da177e4SLinus Torvalds re_enumerate: 37261da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 37271da177e4SLinus Torvalds return -ENODEV; 37281da177e4SLinus Torvalds } 372979efa097SAlan Stern 373079efa097SAlan Stern /** 3731742120c6SMing Lei * usb_reset_device - warn interface drivers and perform a USB port reset 373279efa097SAlan Stern * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 373379efa097SAlan Stern * 373479efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 373579efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 373679efa097SAlan Stern * the reset is over (using their post_reset method). 373779efa097SAlan Stern * 3738742120c6SMing Lei * Return value is the same as for usb_reset_and_verify_device(). 373979efa097SAlan Stern * 374079efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 374179efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 374279efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 374379efa097SAlan Stern * the device using usb_lock_device_for_reset(). 374478d9a487SAlan Stern * 374578d9a487SAlan Stern * If an interface is currently being probed or disconnected, we assume 374678d9a487SAlan Stern * its driver knows how to handle resets. For all other interfaces, 374778d9a487SAlan Stern * if the driver doesn't have pre_reset and post_reset methods then 374878d9a487SAlan Stern * we attempt to unbind it and rebind afterward. 374979efa097SAlan Stern */ 3750742120c6SMing Lei int usb_reset_device(struct usb_device *udev) 375179efa097SAlan Stern { 375279efa097SAlan Stern int ret; 3753852c4b43SAlan Stern int i; 375479efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 375579efa097SAlan Stern 375679efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 375779efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 375879efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 375979efa097SAlan Stern udev->state); 376079efa097SAlan Stern return -EINVAL; 376179efa097SAlan Stern } 376279efa097SAlan Stern 3763645daaabSAlan Stern /* Prevent autosuspend during the reset */ 376494fcda1fSAlan Stern usb_autoresume_device(udev); 3765645daaabSAlan Stern 376679efa097SAlan Stern if (config) { 3767852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 3768852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 376979efa097SAlan Stern struct usb_driver *drv; 377078d9a487SAlan Stern int unbind = 0; 377179efa097SAlan Stern 3772852c4b43SAlan Stern if (cintf->dev.driver) { 377379efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 377478d9a487SAlan Stern if (drv->pre_reset && drv->post_reset) 377578d9a487SAlan Stern unbind = (drv->pre_reset)(cintf); 377678d9a487SAlan Stern else if (cintf->condition == 377778d9a487SAlan Stern USB_INTERFACE_BOUND) 377878d9a487SAlan Stern unbind = 1; 377978d9a487SAlan Stern if (unbind) 378078d9a487SAlan Stern usb_forced_unbind_intf(cintf); 378179efa097SAlan Stern } 378279efa097SAlan Stern } 378379efa097SAlan Stern } 378479efa097SAlan Stern 3785742120c6SMing Lei ret = usb_reset_and_verify_device(udev); 378679efa097SAlan Stern 378779efa097SAlan Stern if (config) { 3788852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 3789852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 379079efa097SAlan Stern struct usb_driver *drv; 379178d9a487SAlan Stern int rebind = cintf->needs_binding; 379279efa097SAlan Stern 379378d9a487SAlan Stern if (!rebind && cintf->dev.driver) { 379479efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 379579efa097SAlan Stern if (drv->post_reset) 379678d9a487SAlan Stern rebind = (drv->post_reset)(cintf); 379778d9a487SAlan Stern else if (cintf->condition == 379878d9a487SAlan Stern USB_INTERFACE_BOUND) 379978d9a487SAlan Stern rebind = 1; 380079efa097SAlan Stern } 38016c640945SAlan Stern if (ret == 0 && rebind) 380278d9a487SAlan Stern usb_rebind_intf(cintf); 380379efa097SAlan Stern } 380479efa097SAlan Stern } 380579efa097SAlan Stern 380694fcda1fSAlan Stern usb_autosuspend_device(udev); 380779efa097SAlan Stern return ret; 380879efa097SAlan Stern } 3809742120c6SMing Lei EXPORT_SYMBOL_GPL(usb_reset_device); 3810dc023dceSInaky Perez-Gonzalez 3811dc023dceSInaky Perez-Gonzalez 3812dc023dceSInaky Perez-Gonzalez /** 3813dc023dceSInaky Perez-Gonzalez * usb_queue_reset_device - Reset a USB device from an atomic context 3814dc023dceSInaky Perez-Gonzalez * @iface: USB interface belonging to the device to reset 3815dc023dceSInaky Perez-Gonzalez * 3816dc023dceSInaky Perez-Gonzalez * This function can be used to reset a USB device from an atomic 3817dc023dceSInaky Perez-Gonzalez * context, where usb_reset_device() won't work (as it blocks). 3818dc023dceSInaky Perez-Gonzalez * 3819dc023dceSInaky Perez-Gonzalez * Doing a reset via this method is functionally equivalent to calling 3820dc023dceSInaky Perez-Gonzalez * usb_reset_device(), except for the fact that it is delayed to a 3821dc023dceSInaky Perez-Gonzalez * workqueue. This means that any drivers bound to other interfaces 3822dc023dceSInaky Perez-Gonzalez * might be unbound, as well as users from usbfs in user space. 3823dc023dceSInaky Perez-Gonzalez * 3824dc023dceSInaky Perez-Gonzalez * Corner cases: 3825dc023dceSInaky Perez-Gonzalez * 3826dc023dceSInaky Perez-Gonzalez * - Scheduling two resets at the same time from two different drivers 3827dc023dceSInaky Perez-Gonzalez * attached to two different interfaces of the same device is 3828dc023dceSInaky Perez-Gonzalez * possible; depending on how the driver attached to each interface 3829dc023dceSInaky Perez-Gonzalez * handles ->pre_reset(), the second reset might happen or not. 3830dc023dceSInaky Perez-Gonzalez * 3831dc023dceSInaky Perez-Gonzalez * - If a driver is unbound and it had a pending reset, the reset will 3832dc023dceSInaky Perez-Gonzalez * be cancelled. 3833dc023dceSInaky Perez-Gonzalez * 3834dc023dceSInaky Perez-Gonzalez * - This function can be called during .probe() or .disconnect() 3835dc023dceSInaky Perez-Gonzalez * times. On return from .disconnect(), any pending resets will be 3836dc023dceSInaky Perez-Gonzalez * cancelled. 3837dc023dceSInaky Perez-Gonzalez * 3838dc023dceSInaky Perez-Gonzalez * There is no no need to lock/unlock the @reset_ws as schedule_work() 3839dc023dceSInaky Perez-Gonzalez * does its own. 3840dc023dceSInaky Perez-Gonzalez * 3841dc023dceSInaky Perez-Gonzalez * NOTE: We don't do any reference count tracking because it is not 3842dc023dceSInaky Perez-Gonzalez * needed. The lifecycle of the work_struct is tied to the 3843dc023dceSInaky Perez-Gonzalez * usb_interface. Before destroying the interface we cancel the 3844dc023dceSInaky Perez-Gonzalez * work_struct, so the fact that work_struct is queued and or 3845dc023dceSInaky Perez-Gonzalez * running means the interface (and thus, the device) exist and 3846dc023dceSInaky Perez-Gonzalez * are referenced. 3847dc023dceSInaky Perez-Gonzalez */ 3848dc023dceSInaky Perez-Gonzalez void usb_queue_reset_device(struct usb_interface *iface) 3849dc023dceSInaky Perez-Gonzalez { 3850dc023dceSInaky Perez-Gonzalez schedule_work(&iface->reset_ws); 3851dc023dceSInaky Perez-Gonzalez } 3852dc023dceSInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_queue_reset_device); 3853