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> 2227729aadSEric Lescouet #include <linux/usb/hcd.h> 2393362a87SPhil Dibowitz #include <linux/usb/quirks.h> 249c8d6178Sakpm@osdl.org #include <linux/kthread.h> 254186ecf8SArjan van de Ven #include <linux/mutex.h> 267dfb7103SNigel Cunningham #include <linux/freezer.h> 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds #include <asm/uaccess.h> 291da177e4SLinus Torvalds #include <asm/byteorder.h> 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #include "usb.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 741bb5f66bSAlan Stern unsigned limited_power:1; 751bb5f66bSAlan Stern unsigned quiescing:1; 76e8054854SAlan Stern unsigned disconnected:1; 771bb5f66bSAlan Stern 781bb5f66bSAlan Stern unsigned has_indicators:1; 791bb5f66bSAlan Stern u8 indicator[USB_MAXCHILDREN]; 806d5aefb8SDavid Howells struct delayed_work leds; 818520f380SAlan Stern struct delayed_work init_work; 827cbe5dcaSAlan Stern void **port_owners; 831bb5f66bSAlan Stern }; 841bb5f66bSAlan Stern 85dbe79bbeSJohn Youn static inline int hub_is_superspeed(struct usb_device *hdev) 86dbe79bbeSJohn Youn { 87dbe79bbeSJohn Youn return (hdev->descriptor.bDeviceProtocol == 3); 88dbe79bbeSJohn Youn } 891bb5f66bSAlan Stern 901da177e4SLinus Torvalds /* Protect struct usb_device->state and ->children members 919ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 921da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 931da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds /* khubd's worklist and its lock */ 961da177e4SLinus Torvalds static DEFINE_SPINLOCK(hub_event_lock); 971da177e4SLinus Torvalds static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ 981da177e4SLinus Torvalds 991da177e4SLinus Torvalds /* Wakes up khubd */ 1001da177e4SLinus Torvalds static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); 1011da177e4SLinus Torvalds 1029c8d6178Sakpm@osdl.org static struct task_struct *khubd_task; 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 1051da177e4SLinus Torvalds static int blinkenlights = 0; 1061da177e4SLinus Torvalds module_param (blinkenlights, bool, S_IRUGO); 1071da177e4SLinus Torvalds MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds /* 110fd7c519dSJaroslav Kysela * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about 111fd7c519dSJaroslav Kysela * 10 seconds to send reply for the initial 64-byte descriptor request. 112fd7c519dSJaroslav Kysela */ 113fd7c519dSJaroslav Kysela /* define initial 64-byte descriptor request timeout in milliseconds */ 114fd7c519dSJaroslav Kysela static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; 115fd7c519dSJaroslav Kysela module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); 116b9cef6c3SWu Fengguang MODULE_PARM_DESC(initial_descriptor_timeout, 117b9cef6c3SWu Fengguang "initial 64-byte descriptor request timeout in milliseconds " 118b9cef6c3SWu Fengguang "(default 5000 - 5.0 seconds)"); 119fd7c519dSJaroslav Kysela 120fd7c519dSJaroslav Kysela /* 1211da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 1221da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 1231da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 1241da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 1251da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 1261da177e4SLinus Torvalds * following module parameters. 1271da177e4SLinus Torvalds * 1281da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 1291da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 1301da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 1311da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 1321da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 1331da177e4SLinus Torvalds */ 1341da177e4SLinus Torvalds static int old_scheme_first = 0; 1351da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 1361da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 1371da177e4SLinus Torvalds "start with the old device initialization scheme"); 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds static int use_both_schemes = 1; 1401da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 1411da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 1421da177e4SLinus Torvalds "try the other device initialization scheme if the " 1431da177e4SLinus Torvalds "first one fails"); 1441da177e4SLinus Torvalds 14532fe0198SAlan Stern /* Mutual exclusion for EHCI CF initialization. This interferes with 14632fe0198SAlan Stern * port reset on some companion controllers. 14732fe0198SAlan Stern */ 14832fe0198SAlan Stern DECLARE_RWSEM(ehci_cf_port_reset_rwsem); 14932fe0198SAlan Stern EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); 15032fe0198SAlan Stern 151948fea37SAlan Stern #define HUB_DEBOUNCE_TIMEOUT 1500 152948fea37SAlan Stern #define HUB_DEBOUNCE_STEP 25 153948fea37SAlan Stern #define HUB_DEBOUNCE_STABLE 100 154948fea37SAlan Stern 1551da177e4SLinus Torvalds 156742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev); 157742120c6SMing Lei 158131dec34SSarah Sharp static inline char *portspeed(struct usb_hub *hub, int portstatus) 1591da177e4SLinus Torvalds { 160131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 161131dec34SSarah Sharp return "5.0 Gb/s"; 162288ead45SAlan Stern if (portstatus & USB_PORT_STAT_HIGH_SPEED) 1631da177e4SLinus Torvalds return "480 Mb/s"; 164288ead45SAlan Stern else if (portstatus & USB_PORT_STAT_LOW_SPEED) 1651da177e4SLinus Torvalds return "1.5 Mb/s"; 1661da177e4SLinus Torvalds else 1671da177e4SLinus Torvalds return "12 Mb/s"; 1681da177e4SLinus Torvalds } 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 17125118084SAlan Stern static struct usb_hub *hdev_to_hub(struct usb_device *hdev) 1721da177e4SLinus Torvalds { 17325118084SAlan Stern if (!hdev || !hdev->actconfig) 17425118084SAlan Stern return NULL; 1751da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1761da177e4SLinus Torvalds } 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 179dbe79bbeSJohn Youn static int get_hub_descriptor(struct usb_device *hdev, void *data) 1801da177e4SLinus Torvalds { 181dbe79bbeSJohn Youn int i, ret, size; 182dbe79bbeSJohn Youn unsigned dtype; 183dbe79bbeSJohn Youn 184dbe79bbeSJohn Youn if (hub_is_superspeed(hdev)) { 185dbe79bbeSJohn Youn dtype = USB_DT_SS_HUB; 186dbe79bbeSJohn Youn size = USB_DT_SS_HUB_SIZE; 187dbe79bbeSJohn Youn } else { 188dbe79bbeSJohn Youn dtype = USB_DT_HUB; 189dbe79bbeSJohn Youn size = sizeof(struct usb_hub_descriptor); 190dbe79bbeSJohn Youn } 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 1931da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 1941da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 195dbe79bbeSJohn Youn dtype << 8, 0, data, size, 1961da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 1971da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 1981da177e4SLinus Torvalds return ret; 1991da177e4SLinus Torvalds } 2001da177e4SLinus Torvalds return -EINVAL; 2011da177e4SLinus Torvalds } 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds /* 2041da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 2051da177e4SLinus Torvalds */ 2061da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 2071da177e4SLinus Torvalds { 2081da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 2091da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds /* 2131da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 2141da177e4SLinus Torvalds */ 2151da177e4SLinus Torvalds static int clear_port_feature(struct usb_device *hdev, int port1, int feature) 2161da177e4SLinus Torvalds { 2171da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 2181da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 2191da177e4SLinus Torvalds NULL, 0, 1000); 2201da177e4SLinus Torvalds } 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds /* 2231da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 2241da177e4SLinus Torvalds */ 2251da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 2261da177e4SLinus Torvalds { 2271da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 2281da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 2291da177e4SLinus Torvalds NULL, 0, 1000); 2301da177e4SLinus Torvalds } 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds /* 2331da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 2341da177e4SLinus Torvalds * for info about using port indicators 2351da177e4SLinus Torvalds */ 2361da177e4SLinus Torvalds static void set_port_led( 2371da177e4SLinus Torvalds struct usb_hub *hub, 2381da177e4SLinus Torvalds int port1, 2391da177e4SLinus Torvalds int selector 2401da177e4SLinus Torvalds ) 2411da177e4SLinus Torvalds { 2421da177e4SLinus Torvalds int status = set_port_feature(hub->hdev, (selector << 8) | port1, 2431da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 2441da177e4SLinus Torvalds if (status < 0) 2451da177e4SLinus Torvalds dev_dbg (hub->intfdev, 2461da177e4SLinus Torvalds "port %d indicator %s status %d\n", 2471da177e4SLinus Torvalds port1, 2481da177e4SLinus Torvalds ({ char *s; switch (selector) { 2491da177e4SLinus Torvalds case HUB_LED_AMBER: s = "amber"; break; 2501da177e4SLinus Torvalds case HUB_LED_GREEN: s = "green"; break; 2511da177e4SLinus Torvalds case HUB_LED_OFF: s = "off"; break; 2521da177e4SLinus Torvalds case HUB_LED_AUTO: s = "auto"; break; 2531da177e4SLinus Torvalds default: s = "??"; break; 2541da177e4SLinus Torvalds }; s; }), 2551da177e4SLinus Torvalds status); 2561da177e4SLinus Torvalds } 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 2591da177e4SLinus Torvalds 260c4028958SDavid Howells static void led_work (struct work_struct *work) 2611da177e4SLinus Torvalds { 262c4028958SDavid Howells struct usb_hub *hub = 263c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 2641da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 2651da177e4SLinus Torvalds unsigned i; 2661da177e4SLinus Torvalds unsigned changed = 0; 2671da177e4SLinus Torvalds int cursor = -1; 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 2701da177e4SLinus Torvalds return; 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds for (i = 0; i < hub->descriptor->bNbrPorts; i++) { 2731da177e4SLinus Torvalds unsigned selector, mode; 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds /* 30%-50% duty cycle */ 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds switch (hub->indicator[i]) { 2781da177e4SLinus Torvalds /* cycle marker */ 2791da177e4SLinus Torvalds case INDICATOR_CYCLE: 2801da177e4SLinus Torvalds cursor = i; 2811da177e4SLinus Torvalds selector = HUB_LED_AUTO; 2821da177e4SLinus Torvalds mode = INDICATOR_AUTO; 2831da177e4SLinus Torvalds break; 2841da177e4SLinus Torvalds /* blinking green = sw attention */ 2851da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 2861da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2871da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 2881da177e4SLinus Torvalds break; 2891da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 2901da177e4SLinus Torvalds selector = HUB_LED_OFF; 2911da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 2921da177e4SLinus Torvalds break; 2931da177e4SLinus Torvalds /* blinking amber = hw attention */ 2941da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 2951da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2961da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 2971da177e4SLinus Torvalds break; 2981da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 2991da177e4SLinus Torvalds selector = HUB_LED_OFF; 3001da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 3011da177e4SLinus Torvalds break; 3021da177e4SLinus Torvalds /* blink green/amber = reserved */ 3031da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 3041da177e4SLinus Torvalds selector = HUB_LED_GREEN; 3051da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 3061da177e4SLinus Torvalds break; 3071da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 3081da177e4SLinus Torvalds selector = HUB_LED_AMBER; 3091da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 3101da177e4SLinus Torvalds break; 3111da177e4SLinus Torvalds default: 3121da177e4SLinus Torvalds continue; 3131da177e4SLinus Torvalds } 3141da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 3151da177e4SLinus Torvalds changed = 1; 3161da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 3171da177e4SLinus Torvalds hub->indicator[i] = mode; 3181da177e4SLinus Torvalds } 3191da177e4SLinus Torvalds if (!changed && blinkenlights) { 3201da177e4SLinus Torvalds cursor++; 3211da177e4SLinus Torvalds cursor %= hub->descriptor->bNbrPorts; 3221da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 3231da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 3241da177e4SLinus Torvalds changed++; 3251da177e4SLinus Torvalds } 3261da177e4SLinus Torvalds if (changed) 3271da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 3281da177e4SLinus Torvalds } 3291da177e4SLinus Torvalds 3301da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 3311da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 3321da177e4SLinus Torvalds #define USB_STS_RETRIES 5 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvalds /* 3351da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 3361da177e4SLinus Torvalds */ 3371da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 3381da177e4SLinus Torvalds struct usb_hub_status *data) 3391da177e4SLinus Torvalds { 3401da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 3411da177e4SLinus Torvalds 3423824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 3433824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 3441da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3451da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 3461da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 3471da177e4SLinus Torvalds } 3481da177e4SLinus Torvalds return status; 3491da177e4SLinus Torvalds } 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds /* 3521da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 3531da177e4SLinus Torvalds */ 3541da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 3551da177e4SLinus Torvalds struct usb_port_status *data) 3561da177e4SLinus Torvalds { 3571da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 3581da177e4SLinus Torvalds 3593824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 3603824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 3611da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3621da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 3631da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 3641da177e4SLinus Torvalds } 3651da177e4SLinus Torvalds return status; 3661da177e4SLinus Torvalds } 3671da177e4SLinus Torvalds 3683eb14915SAlan Stern static int hub_port_status(struct usb_hub *hub, int port1, 3693eb14915SAlan Stern u16 *status, u16 *change) 3703eb14915SAlan Stern { 3713eb14915SAlan Stern int ret; 3723eb14915SAlan Stern 3733eb14915SAlan Stern mutex_lock(&hub->status_mutex); 3743eb14915SAlan Stern ret = get_port_status(hub->hdev, port1, &hub->status->port); 3753eb14915SAlan Stern if (ret < 4) { 3763eb14915SAlan Stern dev_err(hub->intfdev, 3773eb14915SAlan Stern "%s failed (err = %d)\n", __func__, ret); 3783eb14915SAlan Stern if (ret >= 0) 3793eb14915SAlan Stern ret = -EIO; 3803eb14915SAlan Stern } else { 3813eb14915SAlan Stern *status = le16_to_cpu(hub->status->port.wPortStatus); 3823eb14915SAlan Stern *change = le16_to_cpu(hub->status->port.wPortChange); 383dbe79bbeSJohn Youn 3843eb14915SAlan Stern ret = 0; 3853eb14915SAlan Stern } 3863eb14915SAlan Stern mutex_unlock(&hub->status_mutex); 3873eb14915SAlan Stern return ret; 3883eb14915SAlan Stern } 3893eb14915SAlan Stern 3901da177e4SLinus Torvalds static void kick_khubd(struct usb_hub *hub) 3911da177e4SLinus Torvalds { 3921da177e4SLinus Torvalds unsigned long flags; 3931da177e4SLinus Torvalds 3941da177e4SLinus Torvalds spin_lock_irqsave(&hub_event_lock, flags); 3952e2c5eeaSRoel Kluin if (!hub->disconnected && list_empty(&hub->event_list)) { 3961da177e4SLinus Torvalds list_add_tail(&hub->event_list, &hub_event_list); 3978e4ceb38SAlan Stern 3988e4ceb38SAlan Stern /* Suppress autosuspend until khubd runs */ 3998e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 4008e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 4011da177e4SLinus Torvalds wake_up(&khubd_wait); 4021da177e4SLinus Torvalds } 4031da177e4SLinus Torvalds spin_unlock_irqrestore(&hub_event_lock, flags); 4041da177e4SLinus Torvalds } 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds void usb_kick_khubd(struct usb_device *hdev) 4071da177e4SLinus Torvalds { 40825118084SAlan Stern struct usb_hub *hub = hdev_to_hub(hdev); 40925118084SAlan Stern 41025118084SAlan Stern if (hub) 41125118084SAlan Stern kick_khubd(hub); 4121da177e4SLinus Torvalds } 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 4167d12e780SDavid Howells static void hub_irq(struct urb *urb) 4171da177e4SLinus Torvalds { 418ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 419e015268dSAlan Stern int status = urb->status; 42071d2718fSRoel Kluin unsigned i; 4211da177e4SLinus Torvalds unsigned long bits; 4221da177e4SLinus Torvalds 423e015268dSAlan Stern switch (status) { 4241da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 4251da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 4261da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 4271da177e4SLinus Torvalds return; 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds default: /* presumably an error */ 4301da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 431e015268dSAlan Stern dev_dbg (hub->intfdev, "transfer --> %d\n", status); 4321da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 4331da177e4SLinus Torvalds goto resubmit; 434e015268dSAlan Stern hub->error = status; 4351da177e4SLinus Torvalds /* FALL THROUGH */ 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds /* let khubd handle things */ 4381da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 4391da177e4SLinus Torvalds bits = 0; 4401da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 4411da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 4421da177e4SLinus Torvalds << (i*8); 4431da177e4SLinus Torvalds hub->event_bits[0] = bits; 4441da177e4SLinus Torvalds break; 4451da177e4SLinus Torvalds } 4461da177e4SLinus Torvalds 4471da177e4SLinus Torvalds hub->nerrors = 0; 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvalds /* Something happened, let khubd figure it out */ 4501da177e4SLinus Torvalds kick_khubd(hub); 4511da177e4SLinus Torvalds 4521da177e4SLinus Torvalds resubmit: 4531da177e4SLinus Torvalds if (hub->quiescing) 4541da177e4SLinus Torvalds return; 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 4571da177e4SLinus Torvalds && status != -ENODEV && status != -EPERM) 4581da177e4SLinus Torvalds dev_err (hub->intfdev, "resubmit --> %d\n", status); 4591da177e4SLinus Torvalds } 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 4621da177e4SLinus Torvalds static inline int 4631da177e4SLinus Torvalds hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) 4641da177e4SLinus Torvalds { 465c2f6595fSAlan Stern return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4661da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 4671da177e4SLinus Torvalds tt, NULL, 0, 1000); 4681da177e4SLinus Torvalds } 4691da177e4SLinus Torvalds 4701da177e4SLinus Torvalds /* 4711da177e4SLinus Torvalds * enumeration blocks khubd for a long time. we use keventd instead, since 4721da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 4731da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 4741da177e4SLinus Torvalds * both can talk to the same hub concurrently. 4751da177e4SLinus Torvalds */ 476cb88a1b8SAlan Stern static void hub_tt_work(struct work_struct *work) 4771da177e4SLinus Torvalds { 478c4028958SDavid Howells struct usb_hub *hub = 479cb88a1b8SAlan Stern container_of(work, struct usb_hub, tt.clear_work); 4801da177e4SLinus Torvalds unsigned long flags; 48155e5fdfaSMark Lord int limit = 100; 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 48455e5fdfaSMark Lord while (--limit && !list_empty (&hub->tt.clear_list)) { 485d0f830d3SH Hartley Sweeten struct list_head *next; 4861da177e4SLinus Torvalds struct usb_tt_clear *clear; 4871da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 488cb88a1b8SAlan Stern const struct hc_driver *drv; 4891da177e4SLinus Torvalds int status; 4901da177e4SLinus Torvalds 491d0f830d3SH Hartley Sweeten next = hub->tt.clear_list.next; 492d0f830d3SH Hartley Sweeten clear = list_entry (next, struct usb_tt_clear, clear_list); 4931da177e4SLinus Torvalds list_del (&clear->clear_list); 4941da177e4SLinus Torvalds 4951da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 4961da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 4971da177e4SLinus Torvalds status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 4981da177e4SLinus Torvalds if (status) 4991da177e4SLinus Torvalds dev_err (&hdev->dev, 5001da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 5011da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 502cb88a1b8SAlan Stern 503cb88a1b8SAlan Stern /* Tell the HCD, even if the operation failed */ 504cb88a1b8SAlan Stern drv = clear->hcd->driver; 505cb88a1b8SAlan Stern if (drv->clear_tt_buffer_complete) 506cb88a1b8SAlan Stern (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); 507cb88a1b8SAlan Stern 5081da177e4SLinus Torvalds kfree(clear); 509cb88a1b8SAlan Stern spin_lock_irqsave(&hub->tt.lock, flags); 5101da177e4SLinus Torvalds } 5111da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 5121da177e4SLinus Torvalds } 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds /** 515cb88a1b8SAlan Stern * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub 516cb88a1b8SAlan Stern * @urb: an URB associated with the failed or incomplete split transaction 5171da177e4SLinus Torvalds * 5181da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 5191da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 5201da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 5211da177e4SLinus Torvalds * interrupt context. 5221da177e4SLinus Torvalds * 5231da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 5241da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 5251da177e4SLinus Torvalds */ 526cb88a1b8SAlan Stern int usb_hub_clear_tt_buffer(struct urb *urb) 5271da177e4SLinus Torvalds { 528cb88a1b8SAlan Stern struct usb_device *udev = urb->dev; 529cb88a1b8SAlan Stern int pipe = urb->pipe; 5301da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 5311da177e4SLinus Torvalds unsigned long flags; 5321da177e4SLinus Torvalds struct usb_tt_clear *clear; 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 5351da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 5361da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 5371da177e4SLinus Torvalds */ 53854e6ecb2SChristoph Lameter if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { 5391da177e4SLinus Torvalds dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 5401da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 541cb88a1b8SAlan Stern return -ENOMEM; 5421da177e4SLinus Torvalds } 5431da177e4SLinus Torvalds 5441da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 5451da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 5461da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 5471da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 5481da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol (pipe) 5491da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 5501da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 5511da177e4SLinus Torvalds if (usb_pipein (pipe)) 5521da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 5531da177e4SLinus Torvalds 554cb88a1b8SAlan Stern /* info for completion callback */ 555cb88a1b8SAlan Stern clear->hcd = bus_to_hcd(udev->bus); 556cb88a1b8SAlan Stern clear->ep = urb->ep; 557cb88a1b8SAlan Stern 5581da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 5591da177e4SLinus Torvalds spin_lock_irqsave (&tt->lock, flags); 5601da177e4SLinus Torvalds list_add_tail (&clear->clear_list, &tt->clear_list); 561cb88a1b8SAlan Stern schedule_work(&tt->clear_work); 5621da177e4SLinus Torvalds spin_unlock_irqrestore (&tt->lock, flags); 563cb88a1b8SAlan Stern return 0; 5641da177e4SLinus Torvalds } 565cb88a1b8SAlan Stern EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); 5661da177e4SLinus Torvalds 5678520f380SAlan Stern /* If do_delay is false, return the number of milliseconds the caller 5688520f380SAlan Stern * needs to delay. 5698520f380SAlan Stern */ 5708520f380SAlan Stern static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) 5711da177e4SLinus Torvalds { 5721da177e4SLinus Torvalds int port1; 573b789696aSDavid Brownell unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 5748520f380SAlan Stern unsigned delay; 5754489a571SAlan Stern u16 wHubCharacteristics = 5764489a571SAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 5771da177e4SLinus Torvalds 5784489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 5794489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 5804489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 5814489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 5824489a571SAlan Stern * unless we send these messages to the hub. 5834489a571SAlan Stern */ 5844489a571SAlan Stern if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) 5851da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 5864489a571SAlan Stern else 5874489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 5884489a571SAlan Stern "non-switchable hub\n"); 5891da177e4SLinus Torvalds for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) 5904489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 5911da177e4SLinus Torvalds 592b789696aSDavid Brownell /* Wait at least 100 msec for power to become stable */ 5938520f380SAlan Stern delay = max(pgood_delay, (unsigned) 100); 5948520f380SAlan Stern if (do_delay) 5958520f380SAlan Stern msleep(delay); 5968520f380SAlan Stern return delay; 5971da177e4SLinus Torvalds } 5981da177e4SLinus Torvalds 5991da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 6001da177e4SLinus Torvalds u16 *status, u16 *change) 6011da177e4SLinus Torvalds { 6021da177e4SLinus Torvalds int ret; 6031da177e4SLinus Torvalds 604db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 6051da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 6061da177e4SLinus Torvalds if (ret < 0) 6071da177e4SLinus Torvalds dev_err (hub->intfdev, 608441b62c1SHarvey Harrison "%s failed (err = %d)\n", __func__, ret); 6091da177e4SLinus Torvalds else { 6101da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 6111da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 6121da177e4SLinus Torvalds ret = 0; 6131da177e4SLinus Torvalds } 614db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 6151da177e4SLinus Torvalds return ret; 6161da177e4SLinus Torvalds } 6171da177e4SLinus Torvalds 6188b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 6198b28c752SAlan Stern { 6208b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 6210458d5b4SAlan Stern int ret = 0; 6228b28c752SAlan Stern 6230458d5b4SAlan Stern if (hdev->children[port1-1] && set_state) 6248b28c752SAlan Stern usb_set_device_state(hdev->children[port1-1], 6258b28c752SAlan Stern USB_STATE_NOTATTACHED); 626dbe79bbeSJohn Youn if (!hub->error && !hub_is_superspeed(hub->hdev)) 6278b28c752SAlan Stern ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); 6288b28c752SAlan Stern if (ret) 6298b28c752SAlan Stern dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 6308b28c752SAlan Stern port1, ret); 6318b28c752SAlan Stern return ret; 6328b28c752SAlan Stern } 6338b28c752SAlan Stern 6340458d5b4SAlan Stern /* 6356d42fcdbSJustin P. Mattock * Disable a port and mark a logical connect-change event, so that some 6360458d5b4SAlan Stern * time later khubd will disconnect() any existing usb_device on the port 6370458d5b4SAlan Stern * and will re-enumerate if there actually is a device attached. 6380458d5b4SAlan Stern */ 6390458d5b4SAlan Stern static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 6407d069b7dSAlan Stern { 6410458d5b4SAlan Stern dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 6420458d5b4SAlan Stern hub_port_disable(hub, port1, 1); 6430458d5b4SAlan Stern 6440458d5b4SAlan Stern /* FIXME let caller ask to power down the port: 6450458d5b4SAlan Stern * - some devices won't enumerate without a VBUS power cycle 6460458d5b4SAlan Stern * - SRP saves power that way 6470458d5b4SAlan Stern * - ... new call, TBD ... 6480458d5b4SAlan Stern * That's easy if this hub can switch power per-port, and 6490458d5b4SAlan Stern * khubd reactivates the port later (timer, SRP, etc). 6500458d5b4SAlan Stern * Powerdown must be optional, because of reset/DFU. 6510458d5b4SAlan Stern */ 6520458d5b4SAlan Stern 6530458d5b4SAlan Stern set_bit(port1, hub->change_bits); 6540458d5b4SAlan Stern kick_khubd(hub); 6550458d5b4SAlan Stern } 6560458d5b4SAlan Stern 657253e0572SAlan Stern /** 658253e0572SAlan Stern * usb_remove_device - disable a device's port on its parent hub 659253e0572SAlan Stern * @udev: device to be disabled and removed 660253e0572SAlan Stern * Context: @udev locked, must be able to sleep. 661253e0572SAlan Stern * 662253e0572SAlan Stern * After @udev's port has been disabled, khubd is notified and it will 663253e0572SAlan Stern * see that the device has been disconnected. When the device is 664253e0572SAlan Stern * physically unplugged and something is plugged in, the events will 665253e0572SAlan Stern * be received and processed normally. 666253e0572SAlan Stern */ 667253e0572SAlan Stern int usb_remove_device(struct usb_device *udev) 668253e0572SAlan Stern { 669253e0572SAlan Stern struct usb_hub *hub; 670253e0572SAlan Stern struct usb_interface *intf; 671253e0572SAlan Stern 672253e0572SAlan Stern if (!udev->parent) /* Can't remove a root hub */ 673253e0572SAlan Stern return -EINVAL; 674253e0572SAlan Stern hub = hdev_to_hub(udev->parent); 675253e0572SAlan Stern intf = to_usb_interface(hub->intfdev); 676253e0572SAlan Stern 677253e0572SAlan Stern usb_autopm_get_interface(intf); 678253e0572SAlan Stern set_bit(udev->portnum, hub->removed_bits); 679253e0572SAlan Stern hub_port_logical_disconnect(hub, udev->portnum); 680253e0572SAlan Stern usb_autopm_put_interface(intf); 681253e0572SAlan Stern return 0; 682253e0572SAlan Stern } 683253e0572SAlan Stern 6846ee0b270SAlan Stern enum hub_activation_type { 6858e4ceb38SAlan Stern HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ 6868520f380SAlan Stern HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, 6876ee0b270SAlan Stern }; 6885e6effaeSAlan Stern 6898520f380SAlan Stern static void hub_init_func2(struct work_struct *ws); 6908520f380SAlan Stern static void hub_init_func3(struct work_struct *ws); 6918520f380SAlan Stern 692f2835219SAlan Stern static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) 6935e6effaeSAlan Stern { 6945e6effaeSAlan Stern struct usb_device *hdev = hub->hdev; 695653a39d1SSarah Sharp struct usb_hcd *hcd; 696653a39d1SSarah Sharp int ret; 6975e6effaeSAlan Stern int port1; 698f2835219SAlan Stern int status; 699948fea37SAlan Stern bool need_debounce_delay = false; 7008520f380SAlan Stern unsigned delay; 7018520f380SAlan Stern 7028520f380SAlan Stern /* Continue a partial initialization */ 7038520f380SAlan Stern if (type == HUB_INIT2) 7048520f380SAlan Stern goto init2; 7058520f380SAlan Stern if (type == HUB_INIT3) 7068520f380SAlan Stern goto init3; 7075e6effaeSAlan Stern 708f2835219SAlan Stern /* After a resume, port power should still be on. 709f2835219SAlan Stern * For any other type of activation, turn it on. 710f2835219SAlan Stern */ 7118520f380SAlan Stern if (type != HUB_RESUME) { 7128520f380SAlan Stern 7138520f380SAlan Stern /* Speed up system boot by using a delayed_work for the 7148520f380SAlan Stern * hub's initial power-up delays. This is pretty awkward 7158520f380SAlan Stern * and the implementation looks like a home-brewed sort of 7168520f380SAlan Stern * setjmp/longjmp, but it saves at least 100 ms for each 7178520f380SAlan Stern * root hub (assuming usbcore is compiled into the kernel 7188520f380SAlan Stern * rather than as a module). It adds up. 7198520f380SAlan Stern * 7208520f380SAlan Stern * This can't be done for HUB_RESUME or HUB_RESET_RESUME 7218520f380SAlan Stern * because for those activation types the ports have to be 7228520f380SAlan Stern * operational when we return. In theory this could be done 7238520f380SAlan Stern * for HUB_POST_RESET, but it's easier not to. 7248520f380SAlan Stern */ 7258520f380SAlan Stern if (type == HUB_INIT) { 7268520f380SAlan Stern delay = hub_power_on(hub, false); 7278520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); 7288520f380SAlan Stern schedule_delayed_work(&hub->init_work, 7298520f380SAlan Stern msecs_to_jiffies(delay)); 73061fbeba1SAlan Stern 73161fbeba1SAlan Stern /* Suppress autosuspend until init is done */ 7328e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 7338e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 7348520f380SAlan Stern return; /* Continues at init2: below */ 735653a39d1SSarah Sharp } else if (type == HUB_RESET_RESUME) { 736653a39d1SSarah Sharp /* The internal host controller state for the hub device 737653a39d1SSarah Sharp * may be gone after a host power loss on system resume. 738653a39d1SSarah Sharp * Update the device's info so the HW knows it's a hub. 739653a39d1SSarah Sharp */ 740653a39d1SSarah Sharp hcd = bus_to_hcd(hdev->bus); 741653a39d1SSarah Sharp if (hcd->driver->update_hub_device) { 742653a39d1SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 743653a39d1SSarah Sharp &hub->tt, GFP_NOIO); 744653a39d1SSarah Sharp if (ret < 0) { 745653a39d1SSarah Sharp dev_err(hub->intfdev, "Host not " 746653a39d1SSarah Sharp "accepting hub info " 747653a39d1SSarah Sharp "update.\n"); 748653a39d1SSarah Sharp dev_err(hub->intfdev, "LS/FS devices " 749653a39d1SSarah Sharp "and hubs may not work " 750653a39d1SSarah Sharp "under this hub\n."); 751653a39d1SSarah Sharp } 752653a39d1SSarah Sharp } 753653a39d1SSarah Sharp hub_power_on(hub, true); 7548520f380SAlan Stern } else { 7558520f380SAlan Stern hub_power_on(hub, true); 7568520f380SAlan Stern } 7578520f380SAlan Stern } 7588520f380SAlan Stern init2: 759f2835219SAlan Stern 7606ee0b270SAlan Stern /* Check each port and set hub->change_bits to let khubd know 7616ee0b270SAlan Stern * which ports need attention. 7625e6effaeSAlan Stern */ 7635e6effaeSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 7645e6effaeSAlan Stern struct usb_device *udev = hdev->children[port1-1]; 7655e6effaeSAlan Stern u16 portstatus, portchange; 7665e6effaeSAlan Stern 7676ee0b270SAlan Stern portstatus = portchange = 0; 7686ee0b270SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 7696ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 7706ee0b270SAlan Stern dev_dbg(hub->intfdev, 7716ee0b270SAlan Stern "port %d: status %04x change %04x\n", 7726ee0b270SAlan Stern port1, portstatus, portchange); 7735e6effaeSAlan Stern 7746ee0b270SAlan Stern /* After anything other than HUB_RESUME (i.e., initialization 7756ee0b270SAlan Stern * or any sort of reset), every port should be disabled. 7766ee0b270SAlan Stern * Unconnected ports should likewise be disabled (paranoia), 7776ee0b270SAlan Stern * and so should ports for which we have no usb_device. 7785e6effaeSAlan Stern */ 7796ee0b270SAlan Stern if ((portstatus & USB_PORT_STAT_ENABLE) && ( 7806ee0b270SAlan Stern type != HUB_RESUME || 7816ee0b270SAlan Stern !(portstatus & USB_PORT_STAT_CONNECTION) || 7826ee0b270SAlan Stern !udev || 7836ee0b270SAlan Stern udev->state == USB_STATE_NOTATTACHED)) { 7849f0a6cd3SAndiry Xu /* 7859f0a6cd3SAndiry Xu * USB3 protocol ports will automatically transition 7869f0a6cd3SAndiry Xu * to Enabled state when detect an USB3.0 device attach. 7879f0a6cd3SAndiry Xu * Do not disable USB3 protocol ports. 7889f0a6cd3SAndiry Xu */ 789131dec34SSarah Sharp if (!hub_is_superspeed(hdev)) { 7909f0a6cd3SAndiry Xu clear_port_feature(hdev, port1, 7919f0a6cd3SAndiry Xu USB_PORT_FEAT_ENABLE); 7926ee0b270SAlan Stern portstatus &= ~USB_PORT_STAT_ENABLE; 79385f0ff46SSarah Sharp } else { 79485f0ff46SSarah Sharp /* Pretend that power was lost for USB3 devs */ 79585f0ff46SSarah Sharp portstatus &= ~USB_PORT_STAT_ENABLE; 7966ee0b270SAlan Stern } 7979f0a6cd3SAndiry Xu } 7986ee0b270SAlan Stern 799948fea37SAlan Stern /* Clear status-change flags; we'll debounce later */ 800948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) { 801948fea37SAlan Stern need_debounce_delay = true; 802948fea37SAlan Stern clear_port_feature(hub->hdev, port1, 803948fea37SAlan Stern USB_PORT_FEAT_C_CONNECTION); 804948fea37SAlan Stern } 805948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) { 806948fea37SAlan Stern need_debounce_delay = true; 807948fea37SAlan Stern clear_port_feature(hub->hdev, port1, 808948fea37SAlan Stern USB_PORT_FEAT_C_ENABLE); 809948fea37SAlan Stern } 810dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_LINK_STATE) { 811dbe79bbeSJohn Youn need_debounce_delay = true; 812dbe79bbeSJohn Youn clear_port_feature(hub->hdev, port1, 813dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_LINK_STATE); 814dbe79bbeSJohn Youn } 815948fea37SAlan Stern 816253e0572SAlan Stern /* We can forget about a "removed" device when there's a 817253e0572SAlan Stern * physical disconnect or the connect status changes. 818253e0572SAlan Stern */ 819253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 820253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 821253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 822253e0572SAlan Stern 8236ee0b270SAlan Stern if (!udev || udev->state == USB_STATE_NOTATTACHED) { 8246ee0b270SAlan Stern /* Tell khubd to disconnect the device or 8256ee0b270SAlan Stern * check for a new connection 8266ee0b270SAlan Stern */ 8276ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 8286ee0b270SAlan Stern set_bit(port1, hub->change_bits); 8296ee0b270SAlan Stern 8306ee0b270SAlan Stern } else if (portstatus & USB_PORT_STAT_ENABLE) { 8316ee0b270SAlan Stern /* The power session apparently survived the resume. 8326ee0b270SAlan Stern * If there was an overcurrent or suspend change 8336ee0b270SAlan Stern * (i.e., remote wakeup request), have khubd 8346ee0b270SAlan Stern * take care of it. 8356ee0b270SAlan Stern */ 8366ee0b270SAlan Stern if (portchange) 8376ee0b270SAlan Stern set_bit(port1, hub->change_bits); 8386ee0b270SAlan Stern 8396ee0b270SAlan Stern } else if (udev->persist_enabled) { 8406ee0b270SAlan Stern #ifdef CONFIG_PM 8415e6effaeSAlan Stern udev->reset_resume = 1; 8426ee0b270SAlan Stern #endif 8438808f00cSAlan Stern set_bit(port1, hub->change_bits); 8448808f00cSAlan Stern 8456ee0b270SAlan Stern } else { 8466ee0b270SAlan Stern /* The power session is gone; tell khubd */ 8476ee0b270SAlan Stern usb_set_device_state(udev, USB_STATE_NOTATTACHED); 8486ee0b270SAlan Stern set_bit(port1, hub->change_bits); 8495e6effaeSAlan Stern } 8505e6effaeSAlan Stern } 8515e6effaeSAlan Stern 852948fea37SAlan Stern /* If no port-status-change flags were set, we don't need any 853948fea37SAlan Stern * debouncing. If flags were set we can try to debounce the 854948fea37SAlan Stern * ports all at once right now, instead of letting khubd do them 855948fea37SAlan Stern * one at a time later on. 856948fea37SAlan Stern * 857948fea37SAlan Stern * If any port-status changes do occur during this delay, khubd 858948fea37SAlan Stern * will see them later and handle them normally. 859948fea37SAlan Stern */ 8608520f380SAlan Stern if (need_debounce_delay) { 8618520f380SAlan Stern delay = HUB_DEBOUNCE_STABLE; 862f2835219SAlan Stern 8638520f380SAlan Stern /* Don't do a long sleep inside a workqueue routine */ 8648520f380SAlan Stern if (type == HUB_INIT2) { 8658520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); 8668520f380SAlan Stern schedule_delayed_work(&hub->init_work, 8678520f380SAlan Stern msecs_to_jiffies(delay)); 8688520f380SAlan Stern return; /* Continues at init3: below */ 8698520f380SAlan Stern } else { 8708520f380SAlan Stern msleep(delay); 8718520f380SAlan Stern } 8728520f380SAlan Stern } 8738520f380SAlan Stern init3: 874f2835219SAlan Stern hub->quiescing = 0; 875f2835219SAlan Stern 876f2835219SAlan Stern status = usb_submit_urb(hub->urb, GFP_NOIO); 877f2835219SAlan Stern if (status < 0) 878f2835219SAlan Stern dev_err(hub->intfdev, "activate --> %d\n", status); 879f2835219SAlan Stern if (hub->has_indicators && blinkenlights) 880f2835219SAlan Stern schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 881f2835219SAlan Stern 882f2835219SAlan Stern /* Scan all ports that need attention */ 883f2835219SAlan Stern kick_khubd(hub); 8848e4ceb38SAlan Stern 8858e4ceb38SAlan Stern /* Allow autosuspend if it was suppressed */ 8868e4ceb38SAlan Stern if (type <= HUB_INIT3) 8878e4ceb38SAlan Stern usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); 8885e6effaeSAlan Stern } 8895e6effaeSAlan Stern 8908520f380SAlan Stern /* Implement the continuations for the delays above */ 8918520f380SAlan Stern static void hub_init_func2(struct work_struct *ws) 8928520f380SAlan Stern { 8938520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 8948520f380SAlan Stern 8958520f380SAlan Stern hub_activate(hub, HUB_INIT2); 8968520f380SAlan Stern } 8978520f380SAlan Stern 8988520f380SAlan Stern static void hub_init_func3(struct work_struct *ws) 8998520f380SAlan Stern { 9008520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 9018520f380SAlan Stern 9028520f380SAlan Stern hub_activate(hub, HUB_INIT3); 9038520f380SAlan Stern } 9048520f380SAlan Stern 9054330354fSAlan Stern enum hub_quiescing_type { 9064330354fSAlan Stern HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND 9074330354fSAlan Stern }; 9084330354fSAlan Stern 9094330354fSAlan Stern static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) 9104330354fSAlan Stern { 9114330354fSAlan Stern struct usb_device *hdev = hub->hdev; 9124330354fSAlan Stern int i; 9134330354fSAlan Stern 9148520f380SAlan Stern cancel_delayed_work_sync(&hub->init_work); 9158520f380SAlan Stern 9164330354fSAlan Stern /* khubd and related activity won't re-trigger */ 9174330354fSAlan Stern hub->quiescing = 1; 9184330354fSAlan Stern 9194330354fSAlan Stern if (type != HUB_SUSPEND) { 9204330354fSAlan Stern /* Disconnect all the children */ 9214330354fSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 9224330354fSAlan Stern if (hdev->children[i]) 9234330354fSAlan Stern usb_disconnect(&hdev->children[i]); 9244330354fSAlan Stern } 9254330354fSAlan Stern } 9264330354fSAlan Stern 9274330354fSAlan Stern /* Stop khubd and related activity */ 9284330354fSAlan Stern usb_kill_urb(hub->urb); 9294330354fSAlan Stern if (hub->has_indicators) 9304330354fSAlan Stern cancel_delayed_work_sync(&hub->leds); 9314330354fSAlan Stern if (hub->tt.hub) 932cb88a1b8SAlan Stern cancel_work_sync(&hub->tt.clear_work); 9334330354fSAlan Stern } 9344330354fSAlan Stern 9353eb14915SAlan Stern /* caller has locked the hub device */ 9363eb14915SAlan Stern static int hub_pre_reset(struct usb_interface *intf) 9373eb14915SAlan Stern { 9383eb14915SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 9393eb14915SAlan Stern 9404330354fSAlan Stern hub_quiesce(hub, HUB_PRE_RESET); 941f07600cfSAlan Stern return 0; 9427d069b7dSAlan Stern } 9437d069b7dSAlan Stern 9447d069b7dSAlan Stern /* caller has locked the hub device */ 945f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 9467d069b7dSAlan Stern { 9477de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 9487de18d8bSAlan Stern 949f2835219SAlan Stern hub_activate(hub, HUB_POST_RESET); 950f07600cfSAlan Stern return 0; 9517d069b7dSAlan Stern } 9527d069b7dSAlan Stern 9531da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 9541da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 9551da177e4SLinus Torvalds { 956b356b7c7SSarah Sharp struct usb_hcd *hcd; 9571da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 9581da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 9591da177e4SLinus Torvalds u16 hubstatus, hubchange; 96074ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 9611da177e4SLinus Torvalds unsigned int pipe; 9621da177e4SLinus Torvalds int maxp, ret; 9637cbe5dcaSAlan Stern char *message = "out of memory"; 9641da177e4SLinus Torvalds 965d697cddaSAlan Stern hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); 9661da177e4SLinus Torvalds if (!hub->buffer) { 9671da177e4SLinus Torvalds ret = -ENOMEM; 9681da177e4SLinus Torvalds goto fail; 9691da177e4SLinus Torvalds } 9701da177e4SLinus Torvalds 9711da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 9721da177e4SLinus Torvalds if (!hub->status) { 9731da177e4SLinus Torvalds ret = -ENOMEM; 9741da177e4SLinus Torvalds goto fail; 9751da177e4SLinus Torvalds } 976db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 9771da177e4SLinus Torvalds 9781da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 9791da177e4SLinus Torvalds if (!hub->descriptor) { 9801da177e4SLinus Torvalds ret = -ENOMEM; 9811da177e4SLinus Torvalds goto fail; 9821da177e4SLinus Torvalds } 9831da177e4SLinus Torvalds 984dbe79bbeSJohn Youn if (hub_is_superspeed(hdev) && (hdev->parent != NULL)) { 985dbe79bbeSJohn Youn ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 986dbe79bbeSJohn Youn HUB_SET_DEPTH, USB_RT_HUB, 987dbe79bbeSJohn Youn hdev->level - 1, 0, NULL, 0, 988dbe79bbeSJohn Youn USB_CTRL_SET_TIMEOUT); 989dbe79bbeSJohn Youn 990dbe79bbeSJohn Youn if (ret < 0) { 991dbe79bbeSJohn Youn message = "can't set hub depth"; 992dbe79bbeSJohn Youn goto fail; 993dbe79bbeSJohn Youn } 994dbe79bbeSJohn Youn } 995dbe79bbeSJohn Youn 9961da177e4SLinus Torvalds /* Request the entire hub descriptor. 9971da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 9981da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 9991da177e4SLinus Torvalds */ 1000dbe79bbeSJohn Youn ret = get_hub_descriptor(hdev, hub->descriptor); 10011da177e4SLinus Torvalds if (ret < 0) { 10021da177e4SLinus Torvalds message = "can't read hub descriptor"; 10031da177e4SLinus Torvalds goto fail; 10041da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 10051da177e4SLinus Torvalds message = "hub has too many ports!"; 10061da177e4SLinus Torvalds ret = -ENODEV; 10071da177e4SLinus Torvalds goto fail; 10081da177e4SLinus Torvalds } 10091da177e4SLinus Torvalds 10101da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 10111da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 10121da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 10131da177e4SLinus Torvalds 10147cbe5dcaSAlan Stern hub->port_owners = kzalloc(hdev->maxchild * sizeof(void *), GFP_KERNEL); 10157cbe5dcaSAlan Stern if (!hub->port_owners) { 10167cbe5dcaSAlan Stern ret = -ENOMEM; 10177cbe5dcaSAlan Stern goto fail; 10187cbe5dcaSAlan Stern } 10197cbe5dcaSAlan Stern 102074ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 10211da177e4SLinus Torvalds 1022dbe79bbeSJohn Youn /* FIXME for USB 3.0, skip for now */ 1023dbe79bbeSJohn Youn if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && 1024dbe79bbeSJohn Youn !(hub_is_superspeed(hdev))) { 10251da177e4SLinus Torvalds int i; 10261da177e4SLinus Torvalds char portstr [USB_MAXCHILDREN + 1]; 10271da177e4SLinus Torvalds 10281da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 1029dbe79bbeSJohn Youn portstr[i] = hub->descriptor->u.hs.DeviceRemovable 10301da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 10311da177e4SLinus Torvalds ? 'F' : 'R'; 10321da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 10331da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 10341da177e4SLinus Torvalds } else 10351da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 10361da177e4SLinus Torvalds 103774ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 10381da177e4SLinus Torvalds case 0x00: 10391da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 10401da177e4SLinus Torvalds break; 10411da177e4SLinus Torvalds case 0x01: 10421da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 10431da177e4SLinus Torvalds break; 10441da177e4SLinus Torvalds case 0x02: 10451da177e4SLinus Torvalds case 0x03: 10461da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 10471da177e4SLinus Torvalds break; 10481da177e4SLinus Torvalds } 10491da177e4SLinus Torvalds 105074ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 10511da177e4SLinus Torvalds case 0x00: 10521da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 10531da177e4SLinus Torvalds break; 10541da177e4SLinus Torvalds case 0x08: 10551da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 10561da177e4SLinus Torvalds break; 10571da177e4SLinus Torvalds case 0x10: 10581da177e4SLinus Torvalds case 0x18: 10591da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 10601da177e4SLinus Torvalds break; 10611da177e4SLinus Torvalds } 10621da177e4SLinus Torvalds 10631da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 10641da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 1065cb88a1b8SAlan Stern INIT_WORK(&hub->tt.clear_work, hub_tt_work); 10661da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 10671da177e4SLinus Torvalds case 0: 10681da177e4SLinus Torvalds break; 10691da177e4SLinus Torvalds case 1: 10701da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 10711da177e4SLinus Torvalds hub->tt.hub = hdev; 10721da177e4SLinus Torvalds break; 10731da177e4SLinus Torvalds case 2: 10741da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 10751da177e4SLinus Torvalds if (ret == 0) { 10761da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 10771da177e4SLinus Torvalds hub->tt.multi = 1; 10781da177e4SLinus Torvalds } else 10791da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 10801da177e4SLinus Torvalds ret); 10811da177e4SLinus Torvalds hub->tt.hub = hdev; 10821da177e4SLinus Torvalds break; 1083d2e9b4d6SSarah Sharp case 3: 1084d2e9b4d6SSarah Sharp /* USB 3.0 hubs don't have a TT */ 1085d2e9b4d6SSarah Sharp break; 10861da177e4SLinus Torvalds default: 10871da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 10881da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 10891da177e4SLinus Torvalds break; 10901da177e4SLinus Torvalds } 10911da177e4SLinus Torvalds 1092e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 109374ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 1094e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 1095e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 1096e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 1097e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1098e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1099e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 1100e09711aeSdavid-b@pacbell.net } 11011da177e4SLinus Torvalds break; 1102e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 1103e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 1104e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1105e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1106e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 11071da177e4SLinus Torvalds break; 1108e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 1109e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 1110e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1111e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1112e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 11131da177e4SLinus Torvalds break; 1114e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 1115e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 1116e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1117e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1118e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 11191da177e4SLinus Torvalds break; 11201da177e4SLinus Torvalds } 11211da177e4SLinus Torvalds 11221da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 112374ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 11241da177e4SLinus Torvalds hub->has_indicators = 1; 11251da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 11261da177e4SLinus Torvalds } 11271da177e4SLinus Torvalds 11281da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 11291da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 11301da177e4SLinus Torvalds 11311da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 11321da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 11331da177e4SLinus Torvalds */ 11341da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 113555c52718SAlan Stern if (ret < 2) { 11361da177e4SLinus Torvalds message = "can't get hub status"; 11371da177e4SLinus Torvalds goto fail; 11381da177e4SLinus Torvalds } 11397d35b929SAlan Stern le16_to_cpus(&hubstatus); 11407d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 114155c52718SAlan Stern if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) 114255c52718SAlan Stern hub->mA_per_port = 500; 114355c52718SAlan Stern else { 114455c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 114555c52718SAlan Stern hub->limited_power = 1; 114655c52718SAlan Stern } 11477d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 11481da177e4SLinus Torvalds dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 11491da177e4SLinus Torvalds hub->descriptor->bHubContrCurrent); 115055c52718SAlan Stern hub->limited_power = 1; 115155c52718SAlan Stern if (hdev->maxchild > 0) { 115255c52718SAlan Stern int remaining = hdev->bus_mA - 115355c52718SAlan Stern hub->descriptor->bHubContrCurrent; 11541da177e4SLinus Torvalds 115555c52718SAlan Stern if (remaining < hdev->maxchild * 100) 115655c52718SAlan Stern dev_warn(hub_dev, 115755c52718SAlan Stern "insufficient power available " 115855c52718SAlan Stern "to use all downstream ports\n"); 115955c52718SAlan Stern hub->mA_per_port = 100; /* 7.2.1.1 */ 116055c52718SAlan Stern } 116155c52718SAlan Stern } else { /* Self-powered external hub */ 116255c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 116355c52718SAlan Stern * provide less current per port? */ 116455c52718SAlan Stern hub->mA_per_port = 500; 116555c52718SAlan Stern } 116655c52718SAlan Stern if (hub->mA_per_port < 500) 116755c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 116855c52718SAlan Stern hub->mA_per_port); 11691da177e4SLinus Torvalds 1170b356b7c7SSarah Sharp /* Update the HCD's internal representation of this hub before khubd 1171b356b7c7SSarah Sharp * starts getting port status changes for devices under the hub. 1172b356b7c7SSarah Sharp */ 1173b356b7c7SSarah Sharp hcd = bus_to_hcd(hdev->bus); 1174b356b7c7SSarah Sharp if (hcd->driver->update_hub_device) { 1175b356b7c7SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1176b356b7c7SSarah Sharp &hub->tt, GFP_KERNEL); 1177b356b7c7SSarah Sharp if (ret < 0) { 1178b356b7c7SSarah Sharp message = "can't update HCD hub info"; 1179b356b7c7SSarah Sharp goto fail; 1180b356b7c7SSarah Sharp } 1181b356b7c7SSarah Sharp } 1182b356b7c7SSarah Sharp 11831da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 11841da177e4SLinus Torvalds if (ret < 0) { 11851da177e4SLinus Torvalds message = "can't get hub status"; 11861da177e4SLinus Torvalds goto fail; 11871da177e4SLinus Torvalds } 11881da177e4SLinus Torvalds 11891da177e4SLinus Torvalds /* local power status reports aren't always correct */ 11901da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 11911da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 11921da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 11931da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 11941da177e4SLinus Torvalds 119574ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 11961da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 11971da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 11981da177e4SLinus Torvalds 119988fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 120088fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 120188fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 120288fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 120388fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 120488fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 12051da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 12061da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 12071da177e4SLinus Torvalds 12081da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 12091da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 12101da177e4SLinus Torvalds 12111da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 12121da177e4SLinus Torvalds if (!hub->urb) { 12131da177e4SLinus Torvalds ret = -ENOMEM; 12141da177e4SLinus Torvalds goto fail; 12151da177e4SLinus Torvalds } 12161da177e4SLinus Torvalds 12171da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 12181da177e4SLinus Torvalds hub, endpoint->bInterval); 12191da177e4SLinus Torvalds 12201da177e4SLinus Torvalds /* maybe cycle the hub leds */ 12211da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 12221da177e4SLinus Torvalds hub->indicator [0] = INDICATOR_CYCLE; 12231da177e4SLinus Torvalds 1224f2835219SAlan Stern hub_activate(hub, HUB_INIT); 12251da177e4SLinus Torvalds return 0; 12261da177e4SLinus Torvalds 12271da177e4SLinus Torvalds fail: 12281da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 12291da177e4SLinus Torvalds message, ret); 12301da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 12311da177e4SLinus Torvalds return ret; 12321da177e4SLinus Torvalds } 12331da177e4SLinus Torvalds 1234e8054854SAlan Stern static void hub_release(struct kref *kref) 1235e8054854SAlan Stern { 1236e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 1237e8054854SAlan Stern 1238e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 1239e8054854SAlan Stern kfree(hub); 1240e8054854SAlan Stern } 1241e8054854SAlan Stern 12421da177e4SLinus Torvalds static unsigned highspeed_hubs; 12431da177e4SLinus Torvalds 12441da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 12451da177e4SLinus Torvalds { 12461da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 1247e8054854SAlan Stern 1248e8054854SAlan Stern /* Take the hub off the event list and don't let it be added again */ 1249e8054854SAlan Stern spin_lock_irq(&hub_event_lock); 12508e4ceb38SAlan Stern if (!list_empty(&hub->event_list)) { 1251e8054854SAlan Stern list_del_init(&hub->event_list); 12528e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 12538e4ceb38SAlan Stern } 1254e8054854SAlan Stern hub->disconnected = 1; 1255e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 12561da177e4SLinus Torvalds 12577de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 12587de18d8bSAlan Stern hub->error = 0; 12594330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 12607de18d8bSAlan Stern 12618b28c752SAlan Stern usb_set_intfdata (intf, NULL); 12627cbe5dcaSAlan Stern hub->hdev->maxchild = 0; 12631da177e4SLinus Torvalds 1264e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 12651da177e4SLinus Torvalds highspeed_hubs--; 12661da177e4SLinus Torvalds 12671da177e4SLinus Torvalds usb_free_urb(hub->urb); 12687cbe5dcaSAlan Stern kfree(hub->port_owners); 12691da177e4SLinus Torvalds kfree(hub->descriptor); 12701da177e4SLinus Torvalds kfree(hub->status); 1271d697cddaSAlan Stern kfree(hub->buffer); 12721da177e4SLinus Torvalds 1273e8054854SAlan Stern kref_put(&hub->kref, hub_release); 12741da177e4SLinus Torvalds } 12751da177e4SLinus Torvalds 12761da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 12771da177e4SLinus Torvalds { 12781da177e4SLinus Torvalds struct usb_host_interface *desc; 12791da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 12801da177e4SLinus Torvalds struct usb_device *hdev; 12811da177e4SLinus Torvalds struct usb_hub *hub; 12821da177e4SLinus Torvalds 12831da177e4SLinus Torvalds desc = intf->cur_altsetting; 12841da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 12851da177e4SLinus Torvalds 12860c9ffe0fSSarah Sharp /* Hubs have proper suspend/resume support. USB 3.0 device suspend is 12870c9ffe0fSSarah Sharp * different from USB 2.0/1.1 device suspend, and unfortunately we 12880c9ffe0fSSarah Sharp * don't support it yet. So leave autosuspend disabled for USB 3.0 12890c9ffe0fSSarah Sharp * external hubs for now. Enable autosuspend for USB 3.0 roothubs, 12900c9ffe0fSSarah Sharp * since that isn't a "real" hub. 12910c9ffe0fSSarah Sharp */ 12920c9ffe0fSSarah Sharp if (!hub_is_superspeed(hdev) || !hdev->parent) 1293088f7fecSAlan Stern usb_enable_autosuspend(hdev); 1294088f7fecSAlan Stern 129538f3ad5eSFelipe Balbi if (hdev->level == MAX_TOPO_LEVEL) { 1296b9cef6c3SWu Fengguang dev_err(&intf->dev, 1297b9cef6c3SWu Fengguang "Unsupported bus topology: hub nested too deep\n"); 129838f3ad5eSFelipe Balbi return -E2BIG; 129938f3ad5eSFelipe Balbi } 130038f3ad5eSFelipe Balbi 130189ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 130289ccbdc9SDavid Brownell if (hdev->parent) { 130389ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 130489ccbdc9SDavid Brownell return -ENODEV; 130589ccbdc9SDavid Brownell } 130689ccbdc9SDavid Brownell #endif 130789ccbdc9SDavid Brownell 13081da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 13091da177e4SLinus Torvalds /* specs is not defined, but it works */ 13101da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 13111da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 13121da177e4SLinus Torvalds descriptor_error: 13131da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 13141da177e4SLinus Torvalds return -EIO; 13151da177e4SLinus Torvalds } 13161da177e4SLinus Torvalds 13171da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 13181da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 13191da177e4SLinus Torvalds goto descriptor_error; 13201da177e4SLinus Torvalds 13211da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 13221da177e4SLinus Torvalds 1323fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 1324fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 13251da177e4SLinus Torvalds goto descriptor_error; 13261da177e4SLinus Torvalds 13271da177e4SLinus Torvalds /* We found a hub */ 13281da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 13291da177e4SLinus Torvalds 13300a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 13311da177e4SLinus Torvalds if (!hub) { 13321da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 13331da177e4SLinus Torvalds return -ENOMEM; 13341da177e4SLinus Torvalds } 13351da177e4SLinus Torvalds 1336e8054854SAlan Stern kref_init(&hub->kref); 13371da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 13381da177e4SLinus Torvalds hub->intfdev = &intf->dev; 13391da177e4SLinus Torvalds hub->hdev = hdev; 1340c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 13418520f380SAlan Stern INIT_DELAYED_WORK(&hub->init_work, NULL); 1342e8054854SAlan Stern usb_get_intf(intf); 13431da177e4SLinus Torvalds 13441da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 134540f122f3SAlan Stern intf->needs_remote_wakeup = 1; 13461da177e4SLinus Torvalds 13471da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 13481da177e4SLinus Torvalds highspeed_hubs++; 13491da177e4SLinus Torvalds 13501da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 13511da177e4SLinus Torvalds return 0; 13521da177e4SLinus Torvalds 13531da177e4SLinus Torvalds hub_disconnect (intf); 13541da177e4SLinus Torvalds return -ENODEV; 13551da177e4SLinus Torvalds } 13561da177e4SLinus Torvalds 1357c532b29aSAndi Kleen /* No BKL needed */ 13581da177e4SLinus Torvalds static int 13591da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 13601da177e4SLinus Torvalds { 13611da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 13621da177e4SLinus Torvalds 13631da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 13641da177e4SLinus Torvalds switch (code) { 13651da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 13661da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 13671da177e4SLinus Torvalds int i; 13681da177e4SLinus Torvalds 13691da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 13701da177e4SLinus Torvalds if (hdev->devnum <= 0) 13711da177e4SLinus Torvalds info->nports = 0; 13721da177e4SLinus Torvalds else { 13731da177e4SLinus Torvalds info->nports = hdev->maxchild; 13741da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 13751da177e4SLinus Torvalds if (hdev->children[i] == NULL) 13761da177e4SLinus Torvalds info->port[i] = 0; 13771da177e4SLinus Torvalds else 13781da177e4SLinus Torvalds info->port[i] = 13791da177e4SLinus Torvalds hdev->children[i]->devnum; 13801da177e4SLinus Torvalds } 13811da177e4SLinus Torvalds } 13821da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 13831da177e4SLinus Torvalds 13841da177e4SLinus Torvalds return info->nports + 1; 13851da177e4SLinus Torvalds } 13861da177e4SLinus Torvalds 13871da177e4SLinus Torvalds default: 13881da177e4SLinus Torvalds return -ENOSYS; 13891da177e4SLinus Torvalds } 13901da177e4SLinus Torvalds } 13911da177e4SLinus Torvalds 13927cbe5dcaSAlan Stern /* 13937cbe5dcaSAlan Stern * Allow user programs to claim ports on a hub. When a device is attached 13947cbe5dcaSAlan Stern * to one of these "claimed" ports, the program will "own" the device. 13957cbe5dcaSAlan Stern */ 13967cbe5dcaSAlan Stern static int find_port_owner(struct usb_device *hdev, unsigned port1, 13977cbe5dcaSAlan Stern void ***ppowner) 13987cbe5dcaSAlan Stern { 13997cbe5dcaSAlan Stern if (hdev->state == USB_STATE_NOTATTACHED) 14007cbe5dcaSAlan Stern return -ENODEV; 14017cbe5dcaSAlan Stern if (port1 == 0 || port1 > hdev->maxchild) 14027cbe5dcaSAlan Stern return -EINVAL; 14037cbe5dcaSAlan Stern 14047cbe5dcaSAlan Stern /* This assumes that devices not managed by the hub driver 14057cbe5dcaSAlan Stern * will always have maxchild equal to 0. 14067cbe5dcaSAlan Stern */ 14077cbe5dcaSAlan Stern *ppowner = &(hdev_to_hub(hdev)->port_owners[port1 - 1]); 14087cbe5dcaSAlan Stern return 0; 14097cbe5dcaSAlan Stern } 14107cbe5dcaSAlan Stern 14117cbe5dcaSAlan Stern /* In the following three functions, the caller must hold hdev's lock */ 14127cbe5dcaSAlan Stern int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, void *owner) 14137cbe5dcaSAlan Stern { 14147cbe5dcaSAlan Stern int rc; 14157cbe5dcaSAlan Stern void **powner; 14167cbe5dcaSAlan Stern 14177cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 14187cbe5dcaSAlan Stern if (rc) 14197cbe5dcaSAlan Stern return rc; 14207cbe5dcaSAlan Stern if (*powner) 14217cbe5dcaSAlan Stern return -EBUSY; 14227cbe5dcaSAlan Stern *powner = owner; 14237cbe5dcaSAlan Stern return rc; 14247cbe5dcaSAlan Stern } 14257cbe5dcaSAlan Stern 14267cbe5dcaSAlan Stern int usb_hub_release_port(struct usb_device *hdev, unsigned port1, void *owner) 14277cbe5dcaSAlan Stern { 14287cbe5dcaSAlan Stern int rc; 14297cbe5dcaSAlan Stern void **powner; 14307cbe5dcaSAlan Stern 14317cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 14327cbe5dcaSAlan Stern if (rc) 14337cbe5dcaSAlan Stern return rc; 14347cbe5dcaSAlan Stern if (*powner != owner) 14357cbe5dcaSAlan Stern return -ENOENT; 14367cbe5dcaSAlan Stern *powner = NULL; 14377cbe5dcaSAlan Stern return rc; 14387cbe5dcaSAlan Stern } 14397cbe5dcaSAlan Stern 14407cbe5dcaSAlan Stern void usb_hub_release_all_ports(struct usb_device *hdev, void *owner) 14417cbe5dcaSAlan Stern { 14427cbe5dcaSAlan Stern int n; 14437cbe5dcaSAlan Stern void **powner; 14447cbe5dcaSAlan Stern 14457cbe5dcaSAlan Stern n = find_port_owner(hdev, 1, &powner); 14467cbe5dcaSAlan Stern if (n == 0) { 14477cbe5dcaSAlan Stern for (; n < hdev->maxchild; (++n, ++powner)) { 14487cbe5dcaSAlan Stern if (*powner == owner) 14497cbe5dcaSAlan Stern *powner = NULL; 14507cbe5dcaSAlan Stern } 14517cbe5dcaSAlan Stern } 14527cbe5dcaSAlan Stern } 14537cbe5dcaSAlan Stern 14547cbe5dcaSAlan Stern /* The caller must hold udev's lock */ 14557cbe5dcaSAlan Stern bool usb_device_is_owned(struct usb_device *udev) 14567cbe5dcaSAlan Stern { 14577cbe5dcaSAlan Stern struct usb_hub *hub; 14587cbe5dcaSAlan Stern 14597cbe5dcaSAlan Stern if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) 14607cbe5dcaSAlan Stern return false; 14617cbe5dcaSAlan Stern hub = hdev_to_hub(udev->parent); 14627cbe5dcaSAlan Stern return !!hub->port_owners[udev->portnum - 1]; 14637cbe5dcaSAlan Stern } 14647cbe5dcaSAlan Stern 14651da177e4SLinus Torvalds 14661da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 14671da177e4SLinus Torvalds { 14681da177e4SLinus Torvalds int i; 14691da177e4SLinus Torvalds 14701da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 14711da177e4SLinus Torvalds if (udev->children[i]) 14721da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev->children[i]); 14731da177e4SLinus Torvalds } 14749bbdf1e0SAlan Stern if (udev->state == USB_STATE_SUSPENDED) 147515123006SSarah Sharp udev->active_duration -= jiffies; 14761da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 14771da177e4SLinus Torvalds } 14781da177e4SLinus Torvalds 14791da177e4SLinus Torvalds /** 14801da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 14811da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 14821da177e4SLinus Torvalds * @new_state: new state value to be stored 14831da177e4SLinus Torvalds * 14841da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 14851da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 14861da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 14871da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 14881da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 14891da177e4SLinus Torvalds * all changes to any device's state must be protected by the 14901da177e4SLinus Torvalds * device_state_lock spinlock. 14911da177e4SLinus Torvalds * 14921da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 14931da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 14941da177e4SLinus Torvalds * 14951da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 14961da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 14971da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 14981da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 14991da177e4SLinus Torvalds */ 15001da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 15011da177e4SLinus Torvalds enum usb_device_state new_state) 15021da177e4SLinus Torvalds { 15031da177e4SLinus Torvalds unsigned long flags; 15044681b171SRafael J. Wysocki int wakeup = -1; 15051da177e4SLinus Torvalds 15061da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 15071da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 15081da177e4SLinus Torvalds ; /* do nothing */ 1509b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1510fb669cc0SDavid Brownell 1511fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1512fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1513fb669cc0SDavid Brownell */ 1514fb669cc0SDavid Brownell if (udev->parent) { 1515645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1516645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1517645daaabSAlan Stern ; /* No change to wakeup settings */ 1518645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 15194681b171SRafael J. Wysocki wakeup = udev->actconfig->desc.bmAttributes 15204681b171SRafael J. Wysocki & USB_CONFIG_ATT_WAKEUP; 1521645daaabSAlan Stern else 15224681b171SRafael J. Wysocki wakeup = 0; 1523fb669cc0SDavid Brownell } 152415123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED && 152515123006SSarah Sharp new_state != USB_STATE_SUSPENDED) 152615123006SSarah Sharp udev->active_duration -= jiffies; 152715123006SSarah Sharp else if (new_state == USB_STATE_SUSPENDED && 152815123006SSarah Sharp udev->state != USB_STATE_SUSPENDED) 152915123006SSarah Sharp udev->active_duration += jiffies; 1530645daaabSAlan Stern udev->state = new_state; 1531b94dc6b5SDavid Brownell } else 15321da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 15331da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 15344681b171SRafael J. Wysocki if (wakeup >= 0) 15354681b171SRafael J. Wysocki device_set_wakeup_capable(&udev->dev, wakeup); 15361da177e4SLinus Torvalds } 15376da9c990SDavid Vrabel EXPORT_SYMBOL_GPL(usb_set_device_state); 15381da177e4SLinus Torvalds 15398af548dcSInaky Perez-Gonzalez /* 15403b29b68bSAlan Stern * Choose a device number. 15413b29b68bSAlan Stern * 15423b29b68bSAlan Stern * Device numbers are used as filenames in usbfs. On USB-1.1 and 15433b29b68bSAlan Stern * USB-2.0 buses they are also used as device addresses, however on 15443b29b68bSAlan Stern * USB-3.0 buses the address is assigned by the controller hardware 15453b29b68bSAlan Stern * and it usually is not the same as the device number. 15463b29b68bSAlan Stern * 15478af548dcSInaky Perez-Gonzalez * WUSB devices are simple: they have no hubs behind, so the mapping 15488af548dcSInaky Perez-Gonzalez * device <-> virtual port number becomes 1:1. Why? to simplify the 15498af548dcSInaky Perez-Gonzalez * life of the device connection logic in 15508af548dcSInaky Perez-Gonzalez * drivers/usb/wusbcore/devconnect.c. When we do the initial secret 15518af548dcSInaky Perez-Gonzalez * handshake we need to assign a temporary address in the unauthorized 15528af548dcSInaky Perez-Gonzalez * space. For simplicity we use the first virtual port number found to 15538af548dcSInaky Perez-Gonzalez * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] 15548af548dcSInaky Perez-Gonzalez * and that becomes it's address [X < 128] or its unauthorized address 15558af548dcSInaky Perez-Gonzalez * [X | 0x80]. 15568af548dcSInaky Perez-Gonzalez * 15578af548dcSInaky Perez-Gonzalez * We add 1 as an offset to the one-based USB-stack port number 15588af548dcSInaky Perez-Gonzalez * (zero-based wusb virtual port index) for two reasons: (a) dev addr 15598af548dcSInaky Perez-Gonzalez * 0 is reserved by USB for default address; (b) Linux's USB stack 15608af548dcSInaky Perez-Gonzalez * uses always #1 for the root hub of the controller. So USB stack's 15618af548dcSInaky Perez-Gonzalez * port #1, which is wusb virtual-port #0 has address #2. 1562c6515272SSarah Sharp * 1563c6515272SSarah Sharp * Devices connected under xHCI are not as simple. The host controller 1564c6515272SSarah Sharp * supports virtualization, so the hardware assigns device addresses and 1565c6515272SSarah Sharp * the HCD must setup data structures before issuing a set address 1566c6515272SSarah Sharp * command to the hardware. 15678af548dcSInaky Perez-Gonzalez */ 15683b29b68bSAlan Stern static void choose_devnum(struct usb_device *udev) 15691da177e4SLinus Torvalds { 15701da177e4SLinus Torvalds int devnum; 15711da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 15721da177e4SLinus Torvalds 15731da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 15748af548dcSInaky Perez-Gonzalez if (udev->wusb) { 15758af548dcSInaky Perez-Gonzalez devnum = udev->portnum + 1; 15768af548dcSInaky Perez-Gonzalez BUG_ON(test_bit(devnum, bus->devmap.devicemap)); 15778af548dcSInaky Perez-Gonzalez } else { 15788af548dcSInaky Perez-Gonzalez /* Try to allocate the next devnum beginning at 15798af548dcSInaky Perez-Gonzalez * bus->devnum_next. */ 15801da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 15811da177e4SLinus Torvalds bus->devnum_next); 15821da177e4SLinus Torvalds if (devnum >= 128) 15838af548dcSInaky Perez-Gonzalez devnum = find_next_zero_bit(bus->devmap.devicemap, 15848af548dcSInaky Perez-Gonzalez 128, 1); 15851da177e4SLinus Torvalds bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); 15868af548dcSInaky Perez-Gonzalez } 15871da177e4SLinus Torvalds if (devnum < 128) { 15881da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 15891da177e4SLinus Torvalds udev->devnum = devnum; 15901da177e4SLinus Torvalds } 15911da177e4SLinus Torvalds } 15921da177e4SLinus Torvalds 15933b29b68bSAlan Stern static void release_devnum(struct usb_device *udev) 15941da177e4SLinus Torvalds { 15951da177e4SLinus Torvalds if (udev->devnum > 0) { 15961da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 15971da177e4SLinus Torvalds udev->devnum = -1; 15981da177e4SLinus Torvalds } 15991da177e4SLinus Torvalds } 16001da177e4SLinus Torvalds 16013b29b68bSAlan Stern static void update_devnum(struct usb_device *udev, int devnum) 16024953d141SDavid Vrabel { 16034953d141SDavid Vrabel /* The address for a WUSB device is managed by wusbcore. */ 16044953d141SDavid Vrabel if (!udev->wusb) 16054953d141SDavid Vrabel udev->devnum = devnum; 16064953d141SDavid Vrabel } 16074953d141SDavid Vrabel 1608f7410cedSHerbert Xu static void hub_free_dev(struct usb_device *udev) 1609f7410cedSHerbert Xu { 1610f7410cedSHerbert Xu struct usb_hcd *hcd = bus_to_hcd(udev->bus); 1611f7410cedSHerbert Xu 1612f7410cedSHerbert Xu /* Root hubs aren't real devices, so don't free HCD resources */ 1613f7410cedSHerbert Xu if (hcd->driver->free_dev && udev->parent) 1614f7410cedSHerbert Xu hcd->driver->free_dev(hcd, udev); 1615f7410cedSHerbert Xu } 1616f7410cedSHerbert Xu 16171da177e4SLinus Torvalds /** 16181da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 16191da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 16201da177e4SLinus Torvalds * Context: !in_interrupt () 16211da177e4SLinus Torvalds * 16221da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 16231da177e4SLinus Torvalds * 16241da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 16251da177e4SLinus Torvalds * If *pdev is a root hub then this routine will acquire the 16261da177e4SLinus Torvalds * usb_bus_list_lock on behalf of the caller. 16271da177e4SLinus Torvalds * 16281da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 16291da177e4SLinus Torvalds * controllers) should ever call this. 16301da177e4SLinus Torvalds * 16311da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 16321da177e4SLinus Torvalds */ 16331da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 16341da177e4SLinus Torvalds { 16351da177e4SLinus Torvalds struct usb_device *udev = *pdev; 16361da177e4SLinus Torvalds int i; 1637fccf4e86SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 16381da177e4SLinus Torvalds 16391da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 16401da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 164125985edcSLucas De Marchi * this quiesces everything except pending urbs. 16421da177e4SLinus Torvalds */ 16431da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 16443b29b68bSAlan Stern dev_info(&udev->dev, "USB disconnect, device number %d\n", 16453b29b68bSAlan Stern udev->devnum); 16461da177e4SLinus Torvalds 16479ad3d6ccSAlan Stern usb_lock_device(udev); 16489ad3d6ccSAlan Stern 16491da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 16501da177e4SLinus Torvalds for (i = 0; i < USB_MAXCHILDREN; i++) { 16511da177e4SLinus Torvalds if (udev->children[i]) 16521da177e4SLinus Torvalds usb_disconnect(&udev->children[i]); 16531da177e4SLinus Torvalds } 16541da177e4SLinus Torvalds 16551da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 16561da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 16571da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 16581da177e4SLinus Torvalds */ 1659782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 1660fccf4e86SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 16611da177e4SLinus Torvalds usb_disable_device(udev, 0); 1662fccf4e86SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 1663cde217a5SAlan Stern usb_hcd_synchronize_unlinks(udev); 16641da177e4SLinus Torvalds 16653b23dd6fSAlan Stern usb_remove_ep_devs(&udev->ep0); 1666782da727SAlan Stern usb_unlock_device(udev); 16673099e75aSGreg Kroah-Hartman 1668782da727SAlan Stern /* Unregister the device. The device driver is responsible 16693b23dd6fSAlan Stern * for de-configuring the device and invoking the remove-device 16703b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 1671782da727SAlan Stern */ 1672782da727SAlan Stern device_del(&udev->dev); 1673782da727SAlan Stern 1674782da727SAlan Stern /* Free the device number and delete the parent's children[] 16751da177e4SLinus Torvalds * (or root_hub) pointer. 16761da177e4SLinus Torvalds */ 16773b29b68bSAlan Stern release_devnum(udev); 16781da177e4SLinus Torvalds 16791da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 16801da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 16811da177e4SLinus Torvalds *pdev = NULL; 16821da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 16831da177e4SLinus Torvalds 1684f7410cedSHerbert Xu hub_free_dev(udev); 1685f7410cedSHerbert Xu 1686782da727SAlan Stern put_device(&udev->dev); 16871da177e4SLinus Torvalds } 16881da177e4SLinus Torvalds 1689f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 16901da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 16911da177e4SLinus Torvalds { 16921da177e4SLinus Torvalds if (!string) 16931da177e4SLinus Torvalds return; 16941da177e4SLinus Torvalds dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); 16951da177e4SLinus Torvalds } 16961da177e4SLinus Torvalds 1697f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 1698f2a383e4SGreg Kroah-Hartman { 1699f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", 1700f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 1701f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idProduct)); 1702b9cef6c3SWu Fengguang dev_info(&udev->dev, 1703b9cef6c3SWu Fengguang "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", 1704f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 1705f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 1706f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 1707f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 1708f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 1709f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 1710f2a383e4SGreg Kroah-Hartman } 17111da177e4SLinus Torvalds #else 1712f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 17131da177e4SLinus Torvalds #endif 17141da177e4SLinus Torvalds 17151da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 17161da177e4SLinus Torvalds #include "otg_whitelist.h" 17171da177e4SLinus Torvalds #endif 17181da177e4SLinus Torvalds 17193ede760fSOliver Neukum /** 17208d8558d1SAlan Stern * usb_enumerate_device_otg - FIXME (usbcore-internal) 17213ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 17223ede760fSOliver Neukum * 17238d8558d1SAlan Stern * Finish enumeration for On-The-Go devices 17243ede760fSOliver Neukum */ 17258d8558d1SAlan Stern static int usb_enumerate_device_otg(struct usb_device *udev) 17261da177e4SLinus Torvalds { 1727d9d16e8aSInaky Perez-Gonzalez int err = 0; 17281da177e4SLinus Torvalds 17291da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 17301da177e4SLinus Torvalds /* 17311da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 17321da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 17331da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 17341da177e4SLinus Torvalds */ 17351da177e4SLinus Torvalds if (!udev->bus->is_b_host 17361da177e4SLinus Torvalds && udev->config 17371da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 17382eb5052eSFelipe Balbi struct usb_otg_descriptor *desc = NULL; 17391da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 17401da177e4SLinus Torvalds 17411da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 17421da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 17431da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 17441da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 17451da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 174612c3da34SAlan Stern unsigned port1 = udev->portnum; 17471da177e4SLinus Torvalds 17481da177e4SLinus Torvalds dev_info(&udev->dev, 17491da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 17501da177e4SLinus Torvalds (port1 == bus->otg_port) 17511da177e4SLinus Torvalds ? "" : "non-"); 17521da177e4SLinus Torvalds 17531da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 17541da177e4SLinus Torvalds if (port1 == bus->otg_port) 17551da177e4SLinus Torvalds bus->b_hnp_enable = 1; 17561da177e4SLinus Torvalds err = usb_control_msg(udev, 17571da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 17581da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 17591da177e4SLinus Torvalds bus->b_hnp_enable 17601da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 17611da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 17621da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 17631da177e4SLinus Torvalds if (err < 0) { 17641da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 17651da177e4SLinus Torvalds * customize to match your product. 17661da177e4SLinus Torvalds */ 17671da177e4SLinus Torvalds dev_info(&udev->dev, 1768b9cef6c3SWu Fengguang "can't set HNP mode: %d\n", 17691da177e4SLinus Torvalds err); 17701da177e4SLinus Torvalds bus->b_hnp_enable = 0; 17711da177e4SLinus Torvalds } 17721da177e4SLinus Torvalds } 17731da177e4SLinus Torvalds } 17741da177e4SLinus Torvalds } 17751da177e4SLinus Torvalds 17761da177e4SLinus Torvalds if (!is_targeted(udev)) { 17771da177e4SLinus Torvalds 17781da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 17791da177e4SLinus Torvalds * (Includes HNP test device.) 17801da177e4SLinus Torvalds */ 17811da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 1782634a84f8SDavid Brownell err = usb_port_suspend(udev, PMSG_SUSPEND); 17831da177e4SLinus Torvalds if (err < 0) 17841da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 17851da177e4SLinus Torvalds } 1786ffcdc18dSVikram Pandita err = -ENOTSUPP; 17871da177e4SLinus Torvalds goto fail; 17881da177e4SLinus Torvalds } 1789d9d16e8aSInaky Perez-Gonzalez fail: 17901da177e4SLinus Torvalds #endif 1791d9d16e8aSInaky Perez-Gonzalez return err; 1792d9d16e8aSInaky Perez-Gonzalez } 17931da177e4SLinus Torvalds 1794d9d16e8aSInaky Perez-Gonzalez 1795d9d16e8aSInaky Perez-Gonzalez /** 17968d8558d1SAlan Stern * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) 1797d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 1798d9d16e8aSInaky Perez-Gonzalez * 1799d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 1800d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 1801d9d16e8aSInaky Perez-Gonzalez * environment. 1802d9d16e8aSInaky Perez-Gonzalez * 1803d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 1804d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 1805d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 1806d9d16e8aSInaky Perez-Gonzalez */ 18078d8558d1SAlan Stern static int usb_enumerate_device(struct usb_device *udev) 1808d9d16e8aSInaky Perez-Gonzalez { 1809d9d16e8aSInaky Perez-Gonzalez int err; 1810d9d16e8aSInaky Perez-Gonzalez 1811d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 1812d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 1813d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 1814d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 1815d9d16e8aSInaky Perez-Gonzalez err); 1816d9d16e8aSInaky Perez-Gonzalez goto fail; 1817d9d16e8aSInaky Perez-Gonzalez } 1818d9d16e8aSInaky Perez-Gonzalez } 1819d9d16e8aSInaky Perez-Gonzalez if (udev->wusb == 1 && udev->authorized == 0) { 1820d9d16e8aSInaky Perez-Gonzalez udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1821d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1822d9d16e8aSInaky Perez-Gonzalez udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1823d9d16e8aSInaky Perez-Gonzalez } 1824d9d16e8aSInaky Perez-Gonzalez else { 1825d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 1826d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 1827d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 1828d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 1829d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 1830d9d16e8aSInaky Perez-Gonzalez } 18318d8558d1SAlan Stern err = usb_enumerate_device_otg(udev); 1832d9d16e8aSInaky Perez-Gonzalez fail: 1833d9d16e8aSInaky Perez-Gonzalez return err; 1834d9d16e8aSInaky Perez-Gonzalez } 1835d9d16e8aSInaky Perez-Gonzalez 1836d9d16e8aSInaky Perez-Gonzalez 1837d9d16e8aSInaky Perez-Gonzalez /** 1838d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 1839d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 1840d9d16e8aSInaky Perez-Gonzalez * 18418d8558d1SAlan Stern * This is called with devices which have been detected but not fully 18428d8558d1SAlan Stern * enumerated. The device descriptor is available, but not descriptors 1843d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 1844d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 1845d9d16e8aSInaky Perez-Gonzalez * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 1846d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 1847d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 1848d9d16e8aSInaky Perez-Gonzalez * 1849d9d16e8aSInaky Perez-Gonzalez * It will return if the device is configured properly or not. Zero if 1850d9d16e8aSInaky Perez-Gonzalez * the interface was registered with the driver core; else a negative 1851d9d16e8aSInaky Perez-Gonzalez * errno value. 1852d9d16e8aSInaky Perez-Gonzalez * 1853d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 1854d9d16e8aSInaky Perez-Gonzalez * 1855d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 1856d9d16e8aSInaky Perez-Gonzalez */ 1857d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 1858d9d16e8aSInaky Perez-Gonzalez { 1859d9d16e8aSInaky Perez-Gonzalez int err; 1860d9d16e8aSInaky Perez-Gonzalez 186116985408SDan Streetman if (udev->parent) { 186216985408SDan Streetman /* Initialize non-root-hub device wakeup to disabled; 186316985408SDan Streetman * device (un)configuration controls wakeup capable 186416985408SDan Streetman * sysfs power/wakeup controls wakeup enabled/disabled 186516985408SDan Streetman */ 186616985408SDan Streetman device_init_wakeup(&udev->dev, 0); 186716985408SDan Streetman } 186816985408SDan Streetman 18699bbdf1e0SAlan Stern /* Tell the runtime-PM framework the device is active */ 18709bbdf1e0SAlan Stern pm_runtime_set_active(&udev->dev); 1871c08512c7SAlan Stern pm_runtime_get_noresume(&udev->dev); 1872fcc4a01eSAlan Stern pm_runtime_use_autosuspend(&udev->dev); 18739bbdf1e0SAlan Stern pm_runtime_enable(&udev->dev); 18749bbdf1e0SAlan Stern 1875c08512c7SAlan Stern /* By default, forbid autosuspend for all devices. It will be 1876c08512c7SAlan Stern * allowed for hubs during binding. 1877c08512c7SAlan Stern */ 1878c08512c7SAlan Stern usb_disable_autosuspend(udev); 1879c08512c7SAlan Stern 18808d8558d1SAlan Stern err = usb_enumerate_device(udev); /* Read descriptors */ 1881d9d16e8aSInaky Perez-Gonzalez if (err < 0) 1882d9d16e8aSInaky Perez-Gonzalez goto fail; 1883c6515272SSarah Sharp dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", 1884c6515272SSarah Sharp udev->devnum, udev->bus->busnum, 1885c6515272SSarah Sharp (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 18869f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 18879f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 18889f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 18899f8b17e6SKay Sievers 18906cd13201SAlan Stern /* Tell the world! */ 18916cd13201SAlan Stern announce_device(udev); 1892195af2ccSAlan Stern 1893927bc916SRafael J. Wysocki device_enable_async_suspend(&udev->dev); 1894782da727SAlan Stern /* Register the device. The device driver is responsible 18953b23dd6fSAlan Stern * for configuring the device and invoking the add-device 18963b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 1897782da727SAlan Stern */ 18981da177e4SLinus Torvalds err = device_add(&udev->dev); 18991da177e4SLinus Torvalds if (err) { 19001da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 19011da177e4SLinus Torvalds goto fail; 19021da177e4SLinus Torvalds } 19039ad3d6ccSAlan Stern 19043b23dd6fSAlan Stern (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); 1905c08512c7SAlan Stern usb_mark_last_busy(udev); 1906c08512c7SAlan Stern pm_runtime_put_sync_autosuspend(&udev->dev); 1907c066475eSGreg Kroah-Hartman return err; 19081da177e4SLinus Torvalds 19091da177e4SLinus Torvalds fail: 19101da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 19119bbdf1e0SAlan Stern pm_runtime_disable(&udev->dev); 19129bbdf1e0SAlan Stern pm_runtime_set_suspended(&udev->dev); 1913d9d16e8aSInaky Perez-Gonzalez return err; 19141da177e4SLinus Torvalds } 19151da177e4SLinus Torvalds 191693993a0aSInaky Perez-Gonzalez 191793993a0aSInaky Perez-Gonzalez /** 1918fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 1919fd39c86bSRandy Dunlap * @usb_dev: USB device 1920fd39c86bSRandy Dunlap * 1921fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 1922fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 192393993a0aSInaky Perez-Gonzalez * 192493993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 192593993a0aSInaky Perez-Gonzalez * defer its call. 192693993a0aSInaky Perez-Gonzalez */ 192793993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 192893993a0aSInaky Perez-Gonzalez { 192993993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 193093993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 193193993a0aSInaky Perez-Gonzalez goto out_unauthorized; 1932da307123SAlan Stern 193393993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 193493993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 1935da307123SAlan Stern 1936da307123SAlan Stern kfree(usb_dev->product); 193793993a0aSInaky Perez-Gonzalez usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1938da307123SAlan Stern kfree(usb_dev->manufacturer); 193993993a0aSInaky Perez-Gonzalez usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1940da307123SAlan Stern kfree(usb_dev->serial); 194193993a0aSInaky Perez-Gonzalez usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1942da307123SAlan Stern 1943da307123SAlan Stern usb_destroy_configuration(usb_dev); 194493993a0aSInaky Perez-Gonzalez usb_dev->descriptor.bNumConfigurations = 0; 1945da307123SAlan Stern 194693993a0aSInaky Perez-Gonzalez out_unauthorized: 194793993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 194893993a0aSInaky Perez-Gonzalez return 0; 194993993a0aSInaky Perez-Gonzalez } 195093993a0aSInaky Perez-Gonzalez 195193993a0aSInaky Perez-Gonzalez 195293993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 195393993a0aSInaky Perez-Gonzalez { 195493993a0aSInaky Perez-Gonzalez int result = 0, c; 1955da307123SAlan Stern 195693993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 195793993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 195893993a0aSInaky Perez-Gonzalez goto out_authorized; 1959da307123SAlan Stern 196093993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 196193993a0aSInaky Perez-Gonzalez if (result < 0) { 196293993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 196393993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 196493993a0aSInaky Perez-Gonzalez goto error_autoresume; 196593993a0aSInaky Perez-Gonzalez } 196693993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 196793993a0aSInaky Perez-Gonzalez if (result < 0) { 196893993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 196993993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 197093993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 197193993a0aSInaky Perez-Gonzalez } 1972da307123SAlan Stern 1973da307123SAlan Stern kfree(usb_dev->product); 1974da307123SAlan Stern usb_dev->product = NULL; 1975da307123SAlan Stern kfree(usb_dev->manufacturer); 1976da307123SAlan Stern usb_dev->manufacturer = NULL; 1977da307123SAlan Stern kfree(usb_dev->serial); 1978da307123SAlan Stern usb_dev->serial = NULL; 1979da307123SAlan Stern 198093993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 19818d8558d1SAlan Stern result = usb_enumerate_device(usb_dev); 198293993a0aSInaky Perez-Gonzalez if (result < 0) 19838d8558d1SAlan Stern goto error_enumerate; 198493993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 198593993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 198693993a0aSInaky Perez-Gonzalez */ 1987b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 198893993a0aSInaky Perez-Gonzalez if (c >= 0) { 198993993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 199093993a0aSInaky Perez-Gonzalez if (result) { 199193993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 199293993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 199393993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 199493993a0aSInaky Perez-Gonzalez * set other configurations. */ 199593993a0aSInaky Perez-Gonzalez } 199693993a0aSInaky Perez-Gonzalez } 199793993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 1998da307123SAlan Stern 19998d8558d1SAlan Stern error_enumerate: 200093993a0aSInaky Perez-Gonzalez error_device_descriptor: 2001da307123SAlan Stern usb_autosuspend_device(usb_dev); 200293993a0aSInaky Perez-Gonzalez error_autoresume: 200393993a0aSInaky Perez-Gonzalez out_authorized: 200493993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); // complements locktree 200593993a0aSInaky Perez-Gonzalez return result; 200693993a0aSInaky Perez-Gonzalez } 200793993a0aSInaky Perez-Gonzalez 200893993a0aSInaky Perez-Gonzalez 20090165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 20100165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 20110165de09SInaky Perez-Gonzalez { 20120165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 20130165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 20140165de09SInaky Perez-Gonzalez return 0; 20150165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 20160165de09SInaky Perez-Gonzalez return hcd->wireless; 20170165de09SInaky Perez-Gonzalez } 20180165de09SInaky Perez-Gonzalez 20190165de09SInaky Perez-Gonzalez 20201da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 20211da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 20221da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 20231da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 20241da177e4SLinus Torvalds #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) 20251da177e4SLinus Torvalds 20261da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 20271da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 20281da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 20291da177e4SLinus Torvalds #define HUB_RESET_TIMEOUT 500 20301da177e4SLinus Torvalds 20311da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 20321da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 20331da177e4SLinus Torvalds { 20341da177e4SLinus Torvalds int delay_time, ret; 20351da177e4SLinus Torvalds u16 portstatus; 20361da177e4SLinus Torvalds u16 portchange; 20371da177e4SLinus Torvalds 20381da177e4SLinus Torvalds for (delay_time = 0; 20391da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 20401da177e4SLinus Torvalds delay_time += delay) { 20411da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 20421da177e4SLinus Torvalds msleep(delay); 20431da177e4SLinus Torvalds 20441da177e4SLinus Torvalds /* read and decode port status */ 20451da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 20461da177e4SLinus Torvalds if (ret < 0) 20471da177e4SLinus Torvalds return ret; 20481da177e4SLinus Torvalds 20491da177e4SLinus Torvalds /* Device went away? */ 20501da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 20511da177e4SLinus Torvalds return -ENOTCONN; 20521da177e4SLinus Torvalds 2053dd4dd19eSAlan Stern /* bomb out completely if the connection bounced */ 20541da177e4SLinus Torvalds if ((portchange & USB_PORT_STAT_C_CONNECTION)) 2055dd4dd19eSAlan Stern return -ENOTCONN; 20561da177e4SLinus Torvalds 20571da177e4SLinus Torvalds /* if we`ve finished resetting, then break out of the loop */ 20581da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_RESET) && 20591da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_ENABLE)) { 20600165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 2061551cdbbeSGreg Kroah-Hartman udev->speed = USB_SPEED_WIRELESS; 2062131dec34SSarah Sharp else if (hub_is_superspeed(hub->hdev)) 2063809cd1cbSSarah Sharp udev->speed = USB_SPEED_SUPER; 20640165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 20651da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 20661da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 20671da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 20681da177e4SLinus Torvalds else 20691da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 20701da177e4SLinus Torvalds return 0; 20711da177e4SLinus Torvalds } 20721da177e4SLinus Torvalds 20731da177e4SLinus Torvalds /* switch to the long delay after two short delay failures */ 20741da177e4SLinus Torvalds if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 20751da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 20761da177e4SLinus Torvalds 20771da177e4SLinus Torvalds dev_dbg (hub->intfdev, 20781da177e4SLinus Torvalds "port %d not reset yet, waiting %dms\n", 20791da177e4SLinus Torvalds port1, delay); 20801da177e4SLinus Torvalds } 20811da177e4SLinus Torvalds 20821da177e4SLinus Torvalds return -EBUSY; 20831da177e4SLinus Torvalds } 20841da177e4SLinus Torvalds 20851da177e4SLinus Torvalds static int hub_port_reset(struct usb_hub *hub, int port1, 20861da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 20871da177e4SLinus Torvalds { 20881da177e4SLinus Torvalds int i, status; 2089a5f0efabSSarah Sharp struct usb_hcd *hcd; 20901da177e4SLinus Torvalds 2091a5f0efabSSarah Sharp hcd = bus_to_hcd(udev->bus); 209232fe0198SAlan Stern /* Block EHCI CF initialization during the port reset. 209332fe0198SAlan Stern * Some companion controllers don't like it when they mix. 209432fe0198SAlan Stern */ 209532fe0198SAlan Stern down_read(&ehci_cf_port_reset_rwsem); 209632fe0198SAlan Stern 20971da177e4SLinus Torvalds /* Reset the port */ 20981da177e4SLinus Torvalds for (i = 0; i < PORT_RESET_TRIES; i++) { 20991da177e4SLinus Torvalds status = set_port_feature(hub->hdev, 21001da177e4SLinus Torvalds port1, USB_PORT_FEAT_RESET); 21011da177e4SLinus Torvalds if (status) 21021da177e4SLinus Torvalds dev_err(hub->intfdev, 21031da177e4SLinus Torvalds "cannot reset port %d (err = %d)\n", 21041da177e4SLinus Torvalds port1, status); 21051da177e4SLinus Torvalds else { 21061da177e4SLinus Torvalds status = hub_port_wait_reset(hub, port1, udev, delay); 2107dd16525bSDavid Brownell if (status && status != -ENOTCONN) 21081da177e4SLinus Torvalds dev_dbg(hub->intfdev, 21091da177e4SLinus Torvalds "port_wait_reset: err = %d\n", 21101da177e4SLinus Torvalds status); 21111da177e4SLinus Torvalds } 21121da177e4SLinus Torvalds 21131da177e4SLinus Torvalds /* return on disconnect or reset */ 21141da177e4SLinus Torvalds switch (status) { 21151da177e4SLinus Torvalds case 0: 2116b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 2117b789696aSDavid Brownell msleep(10 + 40); 21183b29b68bSAlan Stern update_devnum(udev, 0); 2119a5f0efabSSarah Sharp if (hcd->driver->reset_device) { 2120a5f0efabSSarah Sharp status = hcd->driver->reset_device(hcd, udev); 2121a5f0efabSSarah Sharp if (status < 0) { 2122a5f0efabSSarah Sharp dev_err(&udev->dev, "Cannot reset " 2123a5f0efabSSarah Sharp "HCD device state\n"); 2124a5f0efabSSarah Sharp break; 2125a5f0efabSSarah Sharp } 2126a5f0efabSSarah Sharp } 21271da177e4SLinus Torvalds /* FALL THROUGH */ 21281da177e4SLinus Torvalds case -ENOTCONN: 21291da177e4SLinus Torvalds case -ENODEV: 21301da177e4SLinus Torvalds clear_port_feature(hub->hdev, 21311da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 21321da177e4SLinus Torvalds /* FIXME need disconnect() for NOTATTACHED device */ 21331da177e4SLinus Torvalds usb_set_device_state(udev, status 21341da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 21351da177e4SLinus Torvalds : USB_STATE_DEFAULT); 213632fe0198SAlan Stern goto done; 21371da177e4SLinus Torvalds } 21381da177e4SLinus Torvalds 21391da177e4SLinus Torvalds dev_dbg (hub->intfdev, 21401da177e4SLinus Torvalds "port %d not enabled, trying reset again...\n", 21411da177e4SLinus Torvalds port1); 21421da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 21431da177e4SLinus Torvalds } 21441da177e4SLinus Torvalds 21451da177e4SLinus Torvalds dev_err (hub->intfdev, 21461da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 21471da177e4SLinus Torvalds port1); 21481da177e4SLinus Torvalds 214932fe0198SAlan Stern done: 215032fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 21511da177e4SLinus Torvalds return status; 21521da177e4SLinus Torvalds } 21531da177e4SLinus Torvalds 21545e467f6eSAndiry Xu /* Warm reset a USB3 protocol port */ 21555e467f6eSAndiry Xu static int hub_port_warm_reset(struct usb_hub *hub, int port) 21565e467f6eSAndiry Xu { 21575e467f6eSAndiry Xu int ret; 21585e467f6eSAndiry Xu u16 portstatus, portchange; 21595e467f6eSAndiry Xu 21605e467f6eSAndiry Xu if (!hub_is_superspeed(hub->hdev)) { 21615e467f6eSAndiry Xu dev_err(hub->intfdev, "only USB3 hub support warm reset\n"); 21625e467f6eSAndiry Xu return -EINVAL; 21635e467f6eSAndiry Xu } 21645e467f6eSAndiry Xu 21655e467f6eSAndiry Xu /* Warm reset the port */ 21665e467f6eSAndiry Xu ret = set_port_feature(hub->hdev, 21675e467f6eSAndiry Xu port, USB_PORT_FEAT_BH_PORT_RESET); 21685e467f6eSAndiry Xu if (ret) { 21695e467f6eSAndiry Xu dev_err(hub->intfdev, "cannot warm reset port %d\n", port); 21705e467f6eSAndiry Xu return ret; 21715e467f6eSAndiry Xu } 21725e467f6eSAndiry Xu 21735e467f6eSAndiry Xu msleep(20); 21745e467f6eSAndiry Xu ret = hub_port_status(hub, port, &portstatus, &portchange); 21755e467f6eSAndiry Xu 21765e467f6eSAndiry Xu if (portchange & USB_PORT_STAT_C_RESET) 21775e467f6eSAndiry Xu clear_port_feature(hub->hdev, port, USB_PORT_FEAT_C_RESET); 21785e467f6eSAndiry Xu 21795e467f6eSAndiry Xu if (portchange & USB_PORT_STAT_C_BH_RESET) 21805e467f6eSAndiry Xu clear_port_feature(hub->hdev, port, 21815e467f6eSAndiry Xu USB_PORT_FEAT_C_BH_PORT_RESET); 21825e467f6eSAndiry Xu 21835e467f6eSAndiry Xu if (portchange & USB_PORT_STAT_C_LINK_STATE) 21845e467f6eSAndiry Xu clear_port_feature(hub->hdev, port, 21855e467f6eSAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 21865e467f6eSAndiry Xu 21875e467f6eSAndiry Xu return ret; 21885e467f6eSAndiry Xu } 21895e467f6eSAndiry Xu 21900ed9a57eSAndiry Xu /* Check if a port is power on */ 21910ed9a57eSAndiry Xu static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) 21920ed9a57eSAndiry Xu { 21930ed9a57eSAndiry Xu int ret = 0; 21940ed9a57eSAndiry Xu 21950ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 21960ed9a57eSAndiry Xu if (portstatus & USB_SS_PORT_STAT_POWER) 21970ed9a57eSAndiry Xu ret = 1; 21980ed9a57eSAndiry Xu } else { 21990ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_POWER) 22000ed9a57eSAndiry Xu ret = 1; 22010ed9a57eSAndiry Xu } 22020ed9a57eSAndiry Xu 22030ed9a57eSAndiry Xu return ret; 22040ed9a57eSAndiry Xu } 22050ed9a57eSAndiry Xu 2206d388dab7SAlan Stern #ifdef CONFIG_PM 22071da177e4SLinus Torvalds 22080ed9a57eSAndiry Xu /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ 22090ed9a57eSAndiry Xu static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) 22100ed9a57eSAndiry Xu { 22110ed9a57eSAndiry Xu int ret = 0; 22120ed9a57eSAndiry Xu 22130ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 22140ed9a57eSAndiry Xu if ((portstatus & USB_PORT_STAT_LINK_STATE) 22150ed9a57eSAndiry Xu == USB_SS_PORT_LS_U3) 22160ed9a57eSAndiry Xu ret = 1; 22170ed9a57eSAndiry Xu } else { 22180ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_SUSPEND) 22190ed9a57eSAndiry Xu ret = 1; 22200ed9a57eSAndiry Xu } 22210ed9a57eSAndiry Xu 22220ed9a57eSAndiry Xu return ret; 22230ed9a57eSAndiry Xu } 2224b01b03f3SAlan Stern 2225b01b03f3SAlan Stern /* Determine whether the device on a port is ready for a normal resume, 2226b01b03f3SAlan Stern * is ready for a reset-resume, or should be disconnected. 2227b01b03f3SAlan Stern */ 2228b01b03f3SAlan Stern static int check_port_resume_type(struct usb_device *udev, 2229b01b03f3SAlan Stern struct usb_hub *hub, int port1, 2230b01b03f3SAlan Stern int status, unsigned portchange, unsigned portstatus) 2231b01b03f3SAlan Stern { 2232b01b03f3SAlan Stern /* Is the device still present? */ 22330ed9a57eSAndiry Xu if (status || port_is_suspended(hub, portstatus) || 22340ed9a57eSAndiry Xu !port_is_power_on(hub, portstatus) || 22350ed9a57eSAndiry Xu !(portstatus & USB_PORT_STAT_CONNECTION)) { 2236b01b03f3SAlan Stern if (status >= 0) 2237b01b03f3SAlan Stern status = -ENODEV; 2238b01b03f3SAlan Stern } 2239b01b03f3SAlan Stern 224086c57edfSAlan Stern /* Can't do a normal resume if the port isn't enabled, 224186c57edfSAlan Stern * so try a reset-resume instead. 224286c57edfSAlan Stern */ 224386c57edfSAlan Stern else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { 224486c57edfSAlan Stern if (udev->persist_enabled) 224586c57edfSAlan Stern udev->reset_resume = 1; 224686c57edfSAlan Stern else 2247b01b03f3SAlan Stern status = -ENODEV; 224886c57edfSAlan Stern } 2249b01b03f3SAlan Stern 2250b01b03f3SAlan Stern if (status) { 2251b01b03f3SAlan Stern dev_dbg(hub->intfdev, 2252b01b03f3SAlan Stern "port %d status %04x.%04x after resume, %d\n", 2253b01b03f3SAlan Stern port1, portchange, portstatus, status); 2254b01b03f3SAlan Stern } else if (udev->reset_resume) { 2255b01b03f3SAlan Stern 2256b01b03f3SAlan Stern /* Late port handoff can set status-change bits */ 2257b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) 2258b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2259b01b03f3SAlan Stern USB_PORT_FEAT_C_CONNECTION); 2260b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) 2261b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2262b01b03f3SAlan Stern USB_PORT_FEAT_C_ENABLE); 2263b01b03f3SAlan Stern } 2264b01b03f3SAlan Stern 2265b01b03f3SAlan Stern return status; 2266b01b03f3SAlan Stern } 2267b01b03f3SAlan Stern 22681da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 22691da177e4SLinus Torvalds 22701da177e4SLinus Torvalds /* 2271140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 2272624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 22735edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 22741da177e4SLinus Torvalds * 22751da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 22761da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 22771da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 2278140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 22791da177e4SLinus Torvalds * to disconnect devices while they are suspended. 22801da177e4SLinus Torvalds * 2281390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 2282390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 2283390a8c34SDavid Brownell * 2284624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 2285624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 2286624d6c07SAlan Stern * All devices below the suspended port are also suspended. 2287624d6c07SAlan Stern * 2288624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 2289624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 2290624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 2291624d6c07SAlan Stern * some cases, this wakes the USB host. 2292624d6c07SAlan Stern * 22931da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 22941da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 22951da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 22961da177e4SLinus Torvalds * 22974956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 22984956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 22994956eccdSAlan Stern * State transitions include: 23004956eccdSAlan Stern * 23014956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 23024956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 23034956eccdSAlan Stern * 23044956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 23054956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 23064956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 23074956eccdSAlan Stern * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 23084956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 23094956eccdSAlan Stern * 23104956eccdSAlan Stern * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when 23114956eccdSAlan Stern * the root hub for their bus goes into global suspend ... so we don't 23124956eccdSAlan Stern * (falsely) update the device power state to say it suspended. 23134956eccdSAlan Stern * 23141da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 23151da177e4SLinus Torvalds */ 231665bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 23171da177e4SLinus Torvalds { 2318624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2319624d6c07SAlan Stern int port1 = udev->portnum; 2320624d6c07SAlan Stern int status; 23214956eccdSAlan Stern 2322624d6c07SAlan Stern // dev_dbg(hub->intfdev, "suspend port %d\n", port1); 2323624d6c07SAlan Stern 2324624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 2325624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 2326624d6c07SAlan Stern * 2327624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 2328624d6c07SAlan Stern * we don't explicitly enable it here. 2329624d6c07SAlan Stern */ 2330624d6c07SAlan Stern if (udev->do_remote_wakeup) { 2331624d6c07SAlan Stern status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2332624d6c07SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 2333624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 2334624d6c07SAlan Stern NULL, 0, 2335624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 23360c487206SOliver Neukum if (status) { 2337624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 2338624d6c07SAlan Stern status); 23390c487206SOliver Neukum /* bail if autosuspend is requested */ 23400c487206SOliver Neukum if (msg.event & PM_EVENT_AUTO) 23410c487206SOliver Neukum return status; 23420c487206SOliver Neukum } 2343624d6c07SAlan Stern } 2344624d6c07SAlan Stern 2345624d6c07SAlan Stern /* see 7.1.7.6 */ 2346a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 2347a7114230SAndiry Xu status = set_port_feature(hub->hdev, 2348a7114230SAndiry Xu port1 | (USB_SS_PORT_LS_U3 << 3), 2349a7114230SAndiry Xu USB_PORT_FEAT_LINK_STATE); 2350a8f08d86SAndiry Xu else 2351a8f08d86SAndiry Xu status = set_port_feature(hub->hdev, port1, 2352a8f08d86SAndiry Xu USB_PORT_FEAT_SUSPEND); 2353624d6c07SAlan Stern if (status) { 2354624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", 2355624d6c07SAlan Stern port1, status); 2356624d6c07SAlan Stern /* paranoia: "should not happen" */ 23570c487206SOliver Neukum if (udev->do_remote_wakeup) 2358624d6c07SAlan Stern (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2359624d6c07SAlan Stern USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 2360624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 2361624d6c07SAlan Stern NULL, 0, 2362624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 2363cbb33004SAlan Stern 2364cbb33004SAlan Stern /* System sleep transitions should never fail */ 2365cbb33004SAlan Stern if (!(msg.event & PM_EVENT_AUTO)) 2366cbb33004SAlan Stern status = 0; 2367624d6c07SAlan Stern } else { 2368624d6c07SAlan Stern /* device has up to 10 msec to fully suspend */ 2369624d6c07SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend\n", 237065bfd296SAlan Stern (msg.event & PM_EVENT_AUTO ? "auto-" : "")); 2371624d6c07SAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 2372624d6c07SAlan Stern msleep(10); 2373624d6c07SAlan Stern } 2374c08512c7SAlan Stern usb_mark_last_busy(hub->hdev); 23754956eccdSAlan Stern return status; 23761da177e4SLinus Torvalds } 2377f3f3253dSDavid Brownell 23781da177e4SLinus Torvalds /* 2379390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 2380390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 238154515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 23821da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 23831da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 23841da177e4SLinus Torvalds * in the tree that's rooted at this device. 238554515fe5SAlan Stern * 238654515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 238754515fe5SAlan Stern * status check is done. 23881da177e4SLinus Torvalds */ 2389140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 23901da177e4SLinus Torvalds { 239154515fe5SAlan Stern int status = 0; 23921da177e4SLinus Torvalds u16 devstatus; 23931da177e4SLinus Torvalds 23941da177e4SLinus Torvalds /* caller owns the udev device lock */ 2395b9cef6c3SWu Fengguang dev_dbg(&udev->dev, "%s\n", 2396b9cef6c3SWu Fengguang udev->reset_resume ? "finish reset-resume" : "finish resume"); 23971da177e4SLinus Torvalds 23981da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 23991da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 24001da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 24011da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 24021da177e4SLinus Torvalds */ 24031da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 24041da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 24051da177e4SLinus Torvalds : USB_STATE_ADDRESS); 24061da177e4SLinus Torvalds 240754515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 240854515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 240954515fe5SAlan Stern * operation is carried out here, after the port has been 241054515fe5SAlan Stern * resumed. 241154515fe5SAlan Stern */ 241254515fe5SAlan Stern if (udev->reset_resume) 241386c57edfSAlan Stern retry_reset_resume: 2414742120c6SMing Lei status = usb_reset_and_verify_device(udev); 241554515fe5SAlan Stern 24161da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 24171da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 24181da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 24191da177e4SLinus Torvalds */ 242054515fe5SAlan Stern if (status == 0) { 242146dede46SAlan Stern devstatus = 0; 24221da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 2423b40b7a90SAlan Stern if (status >= 0) 242446dede46SAlan Stern status = (status > 0 ? 0 : -ENODEV); 242586c57edfSAlan Stern 242686c57edfSAlan Stern /* If a normal resume failed, try doing a reset-resume */ 242786c57edfSAlan Stern if (status && !udev->reset_resume && udev->persist_enabled) { 242886c57edfSAlan Stern dev_dbg(&udev->dev, "retry with reset-resume\n"); 242986c57edfSAlan Stern udev->reset_resume = 1; 243086c57edfSAlan Stern goto retry_reset_resume; 243186c57edfSAlan Stern } 243254515fe5SAlan Stern } 2433b40b7a90SAlan Stern 2434624d6c07SAlan Stern if (status) { 2435624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 24361da177e4SLinus Torvalds status); 2437624d6c07SAlan Stern } else if (udev->actconfig) { 24381da177e4SLinus Torvalds le16_to_cpus(&devstatus); 2439686314cfSAlan Stern if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { 24401da177e4SLinus Torvalds status = usb_control_msg(udev, 24411da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 24421da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, 24431da177e4SLinus Torvalds USB_RECIP_DEVICE, 24441da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 24451da177e4SLinus Torvalds NULL, 0, 24461da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 2447a8e7c565SAlan Stern if (status) 2448b9cef6c3SWu Fengguang dev_dbg(&udev->dev, 2449b9cef6c3SWu Fengguang "disable remote wakeup, status %d\n", 2450b9cef6c3SWu Fengguang status); 24514bf0ba86SAlan Stern } 24521da177e4SLinus Torvalds status = 0; 24531da177e4SLinus Torvalds } 24541da177e4SLinus Torvalds return status; 24551da177e4SLinus Torvalds } 24561da177e4SLinus Torvalds 2457624d6c07SAlan Stern /* 2458624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 2459624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 2460624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 2461624d6c07SAlan Stern * 2462624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 2463624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 2464624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 2465624d6c07SAlan Stern * the host and the device is the same as it was when the device 2466624d6c07SAlan Stern * suspended. 2467624d6c07SAlan Stern * 2468feccc30dSAlan Stern * If @udev->reset_resume is set then this routine won't check that the 2469feccc30dSAlan Stern * port is still enabled. Furthermore, finish_port_resume() above will 247054515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 247154515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 247254515fe5SAlan Stern * 247354515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 247454515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 247554515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 247654515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 247754515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 247854515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 247954515fe5SAlan Stern * made to appear as if it had not disconnected. 248054515fe5SAlan Stern * 2481742120c6SMing Lei * This facility can be dangerous. Although usb_reset_and_verify_device() makes 2482feccc30dSAlan Stern * every effort to insure that the same device is present after the 248354515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 248454515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 248554515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 248654515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 248754515fe5SAlan Stern * new card is corrupted and the system crashes. 248854515fe5SAlan Stern * 2489624d6c07SAlan Stern * Returns 0 on success, else negative errno. 2490624d6c07SAlan Stern */ 249165bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 24921da177e4SLinus Torvalds { 2493624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2494624d6c07SAlan Stern int port1 = udev->portnum; 24951da177e4SLinus Torvalds int status; 2496d25450c6SAlan Stern u16 portchange, portstatus; 2497d25450c6SAlan Stern 2498d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 2499d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 25000ed9a57eSAndiry Xu if (status == 0 && !port_is_suspended(hub, portstatus)) 2501d25450c6SAlan Stern goto SuspendCleared; 25021da177e4SLinus Torvalds 25031da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "resume port %d\n", port1); 25041da177e4SLinus Torvalds 2505d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 2506d5cbad4bSAlan Stern 25071da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 2508a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 2509a7114230SAndiry Xu status = set_port_feature(hub->hdev, 2510a7114230SAndiry Xu port1 | (USB_SS_PORT_LS_U0 << 3), 2511a7114230SAndiry Xu USB_PORT_FEAT_LINK_STATE); 2512a7114230SAndiry Xu else 25131da177e4SLinus Torvalds status = clear_port_feature(hub->hdev, 25141da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 25151da177e4SLinus Torvalds if (status) { 2516624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", 25171da177e4SLinus Torvalds port1, status); 25181da177e4SLinus Torvalds } else { 25191da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 2520645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 252165bfd296SAlan Stern (msg.event & PM_EVENT_AUTO ? "auto-" : "")); 25221da177e4SLinus Torvalds msleep(25); 25231da177e4SLinus Torvalds 25241da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 25251da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 25261da177e4SLinus Torvalds * sequence. 25271da177e4SLinus Torvalds */ 2528d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 252954515fe5SAlan Stern 25301da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 25311da177e4SLinus Torvalds msleep(10); 25321da177e4SLinus Torvalds } 2533b01b03f3SAlan Stern 2534b01b03f3SAlan Stern SuspendCleared: 2535b01b03f3SAlan Stern if (status == 0) { 2536a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) { 2537a7114230SAndiry Xu if (portchange & USB_PORT_STAT_C_LINK_STATE) 2538a7114230SAndiry Xu clear_port_feature(hub->hdev, port1, 2539a7114230SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 2540a7114230SAndiry Xu } else { 2541b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 2542b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2543b01b03f3SAlan Stern USB_PORT_FEAT_C_SUSPEND); 25441da177e4SLinus Torvalds } 2545a7114230SAndiry Xu } 25461da177e4SLinus Torvalds 2547d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 2548d5cbad4bSAlan Stern 2549b01b03f3SAlan Stern status = check_port_resume_type(udev, 2550b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 255154515fe5SAlan Stern if (status == 0) 255254515fe5SAlan Stern status = finish_port_resume(udev); 255354515fe5SAlan Stern if (status < 0) { 255454515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 255554515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 255654515fe5SAlan Stern } 25571da177e4SLinus Torvalds return status; 25581da177e4SLinus Torvalds } 25591da177e4SLinus Torvalds 25608808f00cSAlan Stern /* caller has locked udev */ 25610534d468SAlan Stern int usb_remote_wakeup(struct usb_device *udev) 25621da177e4SLinus Torvalds { 25631da177e4SLinus Torvalds int status = 0; 25641da177e4SLinus Torvalds 25651da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 2566645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 25679bbdf1e0SAlan Stern status = usb_autoresume_device(udev); 25689bbdf1e0SAlan Stern if (status == 0) { 25699bbdf1e0SAlan Stern /* Let the drivers do their thing, then... */ 25709bbdf1e0SAlan Stern usb_autosuspend_device(udev); 25719bbdf1e0SAlan Stern } 2572d25450c6SAlan Stern } 25731da177e4SLinus Torvalds return status; 25741da177e4SLinus Torvalds } 25751da177e4SLinus Torvalds 2576d388dab7SAlan Stern #else /* CONFIG_USB_SUSPEND */ 2577d388dab7SAlan Stern 2578d388dab7SAlan Stern /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ 2579d388dab7SAlan Stern 258065bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 2581d388dab7SAlan Stern { 2582d388dab7SAlan Stern return 0; 2583d388dab7SAlan Stern } 2584d388dab7SAlan Stern 2585b01b03f3SAlan Stern /* However we may need to do a reset-resume */ 2586b01b03f3SAlan Stern 258765bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 2588d388dab7SAlan Stern { 2589b01b03f3SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2590b01b03f3SAlan Stern int port1 = udev->portnum; 2591b01b03f3SAlan Stern int status; 2592b01b03f3SAlan Stern u16 portchange, portstatus; 259354515fe5SAlan Stern 2594b01b03f3SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 2595b01b03f3SAlan Stern status = check_port_resume_type(udev, 2596b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 2597b01b03f3SAlan Stern 2598b01b03f3SAlan Stern if (status) { 2599b01b03f3SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 2600b01b03f3SAlan Stern hub_port_logical_disconnect(hub, port1); 2601b01b03f3SAlan Stern } else if (udev->reset_resume) { 260254515fe5SAlan Stern dev_dbg(&udev->dev, "reset-resume\n"); 2603742120c6SMing Lei status = usb_reset_and_verify_device(udev); 260454515fe5SAlan Stern } 260554515fe5SAlan Stern return status; 2606d388dab7SAlan Stern } 2607d388dab7SAlan Stern 2608d388dab7SAlan Stern #endif 2609d388dab7SAlan Stern 2610db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 26111da177e4SLinus Torvalds { 26121da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 26131da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 26141da177e4SLinus Torvalds unsigned port1; 26151da177e4SLinus Torvalds 2616cbb33004SAlan Stern /* Warn if children aren't already suspended */ 26171da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 26181da177e4SLinus Torvalds struct usb_device *udev; 26191da177e4SLinus Torvalds 26201da177e4SLinus Torvalds udev = hdev->children [port1-1]; 26216840d255SAlan Stern if (udev && udev->can_submit) { 2622cbb33004SAlan Stern dev_warn(&intf->dev, "port %d nyet suspended\n", port1); 2623cbb33004SAlan Stern if (msg.event & PM_EVENT_AUTO) 2624c9f89fa4SDavid Brownell return -EBUSY; 2625c9f89fa4SDavid Brownell } 26261da177e4SLinus Torvalds } 26271da177e4SLinus Torvalds 2628441b62c1SHarvey Harrison dev_dbg(&intf->dev, "%s\n", __func__); 262940f122f3SAlan Stern 2630c9f89fa4SDavid Brownell /* stop khubd and related activity */ 26314330354fSAlan Stern hub_quiesce(hub, HUB_SUSPEND); 2632b6f6436dSAlan Stern return 0; 26331da177e4SLinus Torvalds } 26341da177e4SLinus Torvalds 26351da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 26361da177e4SLinus Torvalds { 26371da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 26381da177e4SLinus Torvalds 26395e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 2640f2835219SAlan Stern hub_activate(hub, HUB_RESUME); 26411da177e4SLinus Torvalds return 0; 26421da177e4SLinus Torvalds } 26431da177e4SLinus Torvalds 2644b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 2645f07600cfSAlan Stern { 2646b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 2647f07600cfSAlan Stern 26485e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 2649f2835219SAlan Stern hub_activate(hub, HUB_RESET_RESUME); 2650f07600cfSAlan Stern return 0; 2651f07600cfSAlan Stern } 2652f07600cfSAlan Stern 265354515fe5SAlan Stern /** 265454515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 265554515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 265654515fe5SAlan Stern * 265754515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 265854515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 2659feccc30dSAlan Stern * has been reset. The routine marks @rhdev as having lost power. 2660feccc30dSAlan Stern * When the hub driver is resumed it will take notice and carry out 2661feccc30dSAlan Stern * power-session recovery for all the "USB-PERSIST"-enabled child devices; 2662feccc30dSAlan Stern * the others will be disconnected. 266354515fe5SAlan Stern */ 266454515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 266554515fe5SAlan Stern { 266654515fe5SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 266754515fe5SAlan Stern rhdev->reset_resume = 1; 266854515fe5SAlan Stern } 266954515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 267054515fe5SAlan Stern 2671d388dab7SAlan Stern #else /* CONFIG_PM */ 2672d388dab7SAlan Stern 2673511366daSAndrew Morton #define hub_suspend NULL 2674511366daSAndrew Morton #define hub_resume NULL 2675f07600cfSAlan Stern #define hub_reset_resume NULL 2676d388dab7SAlan Stern #endif 2677d388dab7SAlan Stern 26781da177e4SLinus Torvalds 26791da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 26801da177e4SLinus Torvalds * 26811da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 26821da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 26831da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 26841da177e4SLinus Torvalds * 26851da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 26861da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 26871da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 26881da177e4SLinus Torvalds * 26891da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 26901da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 26911da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 26921da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 26931da177e4SLinus Torvalds */ 26941da177e4SLinus Torvalds static int hub_port_debounce(struct usb_hub *hub, int port1) 26951da177e4SLinus Torvalds { 26961da177e4SLinus Torvalds int ret; 26971da177e4SLinus Torvalds int total_time, stable_time = 0; 26981da177e4SLinus Torvalds u16 portchange, portstatus; 26991da177e4SLinus Torvalds unsigned connection = 0xffff; 27001da177e4SLinus Torvalds 27011da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 27021da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 27031da177e4SLinus Torvalds if (ret < 0) 27041da177e4SLinus Torvalds return ret; 27051da177e4SLinus Torvalds 27061da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 27071da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 27081da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 27091da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 27101da177e4SLinus Torvalds break; 27111da177e4SLinus Torvalds } else { 27121da177e4SLinus Torvalds stable_time = 0; 27131da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 27141da177e4SLinus Torvalds } 27151da177e4SLinus Torvalds 27161da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 27171da177e4SLinus Torvalds clear_port_feature(hub->hdev, port1, 27181da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 27191da177e4SLinus Torvalds } 27201da177e4SLinus Torvalds 27211da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 27221da177e4SLinus Torvalds break; 27231da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 27241da177e4SLinus Torvalds } 27251da177e4SLinus Torvalds 27261da177e4SLinus Torvalds dev_dbg (hub->intfdev, 27271da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 27281da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 27291da177e4SLinus Torvalds 27301da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 27311da177e4SLinus Torvalds return -ETIMEDOUT; 27321da177e4SLinus Torvalds return portstatus; 27331da177e4SLinus Torvalds } 27341da177e4SLinus Torvalds 2735fc721f51SInaky Perez-Gonzalez void usb_ep0_reinit(struct usb_device *udev) 27361da177e4SLinus Torvalds { 2737ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); 2738ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); 27392caf7fcdSAlan Stern usb_enable_endpoint(udev, &udev->ep0, true); 27401da177e4SLinus Torvalds } 2741fc721f51SInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_ep0_reinit); 27421da177e4SLinus Torvalds 27431da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 27441da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 27451da177e4SLinus Torvalds 27464326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 27471da177e4SLinus Torvalds { 27481da177e4SLinus Torvalds int retval; 2749c6515272SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 27501da177e4SLinus Torvalds 2751c6515272SSarah Sharp /* 2752c6515272SSarah Sharp * The host controller will choose the device address, 2753c6515272SSarah Sharp * instead of the core having chosen it earlier 2754c6515272SSarah Sharp */ 2755c6515272SSarah Sharp if (!hcd->driver->address_device && devnum <= 1) 27561da177e4SLinus Torvalds return -EINVAL; 27571da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 27581da177e4SLinus Torvalds return 0; 27591da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 27601da177e4SLinus Torvalds return -EINVAL; 2761c8d4af8eSAndiry Xu if (hcd->driver->address_device) 2762c6515272SSarah Sharp retval = hcd->driver->address_device(hcd, udev); 2763c8d4af8eSAndiry Xu else 27641da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 27654326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 27661da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 27671da177e4SLinus Torvalds if (retval == 0) { 27683b29b68bSAlan Stern update_devnum(udev, devnum); 27694953d141SDavid Vrabel /* Device now using proper address. */ 27701da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 2771fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 27721da177e4SLinus Torvalds } 27731da177e4SLinus Torvalds return retval; 27741da177e4SLinus Torvalds } 27751da177e4SLinus Torvalds 27761da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 27771da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 27781da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 27791da177e4SLinus Torvalds * 27801da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 2781742120c6SMing Lei * usb_reset_and_verify_device), the caller must own the device lock. For a 27821da177e4SLinus Torvalds * newly detected device that is not accessible through any global 27831da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 27841da177e4SLinus Torvalds */ 27851da177e4SLinus Torvalds static int 27861da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 27871da177e4SLinus Torvalds int retry_counter) 27881da177e4SLinus Torvalds { 27894186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 27901da177e4SLinus Torvalds 27911da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 2792e7b77172SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 27931da177e4SLinus Torvalds int i, j, retval; 27941da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 27951da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 279683a07196SInaky Perez-Gonzalez char *speed, *type; 27974326ed0bSAlan Stern int devnum = udev->devnum; 27981da177e4SLinus Torvalds 27991da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 28001da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 28011da177e4SLinus Torvalds */ 28021da177e4SLinus Torvalds if (!hdev->parent) { 28031da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 28041da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 28051da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 28061da177e4SLinus Torvalds } 28071da177e4SLinus Torvalds 28081da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 28091da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 28101da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 28111da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 28121da177e4SLinus Torvalds 28134186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 28141da177e4SLinus Torvalds 28151da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 2816e7b77172SSarah Sharp /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ 28171da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 28181da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 28191da177e4SLinus Torvalds goto fail; 28201da177e4SLinus Torvalds /* success, speed is known */ 282107194ab7SLuben Tuikov 28221da177e4SLinus Torvalds retval = -ENODEV; 28231da177e4SLinus Torvalds 28241da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 28251da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 28261da177e4SLinus Torvalds goto fail; 28271da177e4SLinus Torvalds } 28281da177e4SLinus Torvalds oldspeed = udev->speed; 28291da177e4SLinus Torvalds 28301da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 28311da177e4SLinus Torvalds * it's fixed size except for full speed devices. 28325bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 28335bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 28341da177e4SLinus Torvalds */ 28351da177e4SLinus Torvalds switch (udev->speed) { 28366b403b02SSarah Sharp case USB_SPEED_SUPER: 2837551cdbbeSGreg Kroah-Hartman case USB_SPEED_WIRELESS: /* fixed at 512 */ 2838551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); 28395bb6e0aeSInaky Perez-Gonzalez break; 28401da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 2841551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 28421da177e4SLinus Torvalds break; 28431da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 28441da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 28451da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 28461da177e4SLinus Torvalds * then correct our initial guess. 28471da177e4SLinus Torvalds */ 2848551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 28491da177e4SLinus Torvalds break; 28501da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 2851551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); 28521da177e4SLinus Torvalds break; 28531da177e4SLinus Torvalds default: 28541da177e4SLinus Torvalds goto fail; 28551da177e4SLinus Torvalds } 28561da177e4SLinus Torvalds 285783a07196SInaky Perez-Gonzalez type = ""; 285883a07196SInaky Perez-Gonzalez switch (udev->speed) { 28591da177e4SLinus Torvalds case USB_SPEED_LOW: speed = "low"; break; 28601da177e4SLinus Torvalds case USB_SPEED_FULL: speed = "full"; break; 28611da177e4SLinus Torvalds case USB_SPEED_HIGH: speed = "high"; break; 28626b403b02SSarah Sharp case USB_SPEED_SUPER: 28636b403b02SSarah Sharp speed = "super"; 28646b403b02SSarah Sharp break; 2865551cdbbeSGreg Kroah-Hartman case USB_SPEED_WIRELESS: 286683a07196SInaky Perez-Gonzalez speed = "variable"; 286783a07196SInaky Perez-Gonzalez type = "Wireless "; 286883a07196SInaky Perez-Gonzalez break; 28691da177e4SLinus Torvalds default: speed = "?"; break; 287083a07196SInaky Perez-Gonzalez } 2871c6515272SSarah Sharp if (udev->speed != USB_SPEED_SUPER) 287283a07196SInaky Perez-Gonzalez dev_info(&udev->dev, 28733b29b68bSAlan Stern "%s %s speed %sUSB device number %d using %s\n", 287483a07196SInaky Perez-Gonzalez (udev->config) ? "reset" : "new", speed, type, 28753b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 28761da177e4SLinus Torvalds 28771da177e4SLinus Torvalds /* Set up TT records, if needed */ 28781da177e4SLinus Torvalds if (hdev->tt) { 28791da177e4SLinus Torvalds udev->tt = hdev->tt; 28801da177e4SLinus Torvalds udev->ttport = hdev->ttport; 28811da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 28821da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 2883d199c96dSAlan Stern if (!hub->tt.hub) { 2884d199c96dSAlan Stern dev_err(&udev->dev, "parent hub has no TT\n"); 2885d199c96dSAlan Stern retval = -EINVAL; 2886d199c96dSAlan Stern goto fail; 2887d199c96dSAlan Stern } 28881da177e4SLinus Torvalds udev->tt = &hub->tt; 28891da177e4SLinus Torvalds udev->ttport = port1; 28901da177e4SLinus Torvalds } 28911da177e4SLinus Torvalds 28921da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 28931da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 28941da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 28951da177e4SLinus Torvalds * Change it cautiously. 28961da177e4SLinus Torvalds * 28971da177e4SLinus Torvalds * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 28981da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 28991da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 29001da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 29011da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 29021da177e4SLinus Torvalds * value. 29031da177e4SLinus Torvalds */ 29041da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 2905c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) { 29061da177e4SLinus Torvalds struct usb_device_descriptor *buf; 29071da177e4SLinus Torvalds int r = 0; 29081da177e4SLinus Torvalds 29091da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 29101da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 29111da177e4SLinus Torvalds if (!buf) { 29121da177e4SLinus Torvalds retval = -ENOMEM; 29131da177e4SLinus Torvalds continue; 29141da177e4SLinus Torvalds } 29151da177e4SLinus Torvalds 2916b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 2917b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 2918b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 29191da177e4SLinus Torvalds */ 29201da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 29211da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 29221da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 29231da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 29241da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 29251da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 2926fd7c519dSJaroslav Kysela initial_descriptor_timeout); 29271da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 29285bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 29291da177e4SLinus Torvalds if (buf->bDescriptorType == 29301da177e4SLinus Torvalds USB_DT_DEVICE) { 29311da177e4SLinus Torvalds r = 0; 29321da177e4SLinus Torvalds break; 29331da177e4SLinus Torvalds } 29341da177e4SLinus Torvalds /* FALL THROUGH */ 29351da177e4SLinus Torvalds default: 29361da177e4SLinus Torvalds if (r == 0) 29371da177e4SLinus Torvalds r = -EPROTO; 29381da177e4SLinus Torvalds break; 29391da177e4SLinus Torvalds } 29401da177e4SLinus Torvalds if (r == 0) 29411da177e4SLinus Torvalds break; 29421da177e4SLinus Torvalds } 29431da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 29441da177e4SLinus Torvalds buf->bMaxPacketSize0; 29451da177e4SLinus Torvalds kfree(buf); 29461da177e4SLinus Torvalds 29471da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 29481da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 29491da177e4SLinus Torvalds goto fail; 29501da177e4SLinus Torvalds if (oldspeed != udev->speed) { 29511da177e4SLinus Torvalds dev_dbg(&udev->dev, 29521da177e4SLinus Torvalds "device reset changed speed!\n"); 29531da177e4SLinus Torvalds retval = -ENODEV; 29541da177e4SLinus Torvalds goto fail; 29551da177e4SLinus Torvalds } 29561da177e4SLinus Torvalds if (r) { 2957b9cef6c3SWu Fengguang dev_err(&udev->dev, 2958b9cef6c3SWu Fengguang "device descriptor read/64, error %d\n", 2959b9cef6c3SWu Fengguang r); 29601da177e4SLinus Torvalds retval = -EMSGSIZE; 29611da177e4SLinus Torvalds continue; 29621da177e4SLinus Torvalds } 29631da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 29641da177e4SLinus Torvalds } 29651da177e4SLinus Torvalds 29666c529cdcSInaky Perez-Gonzalez /* 29676c529cdcSInaky Perez-Gonzalez * If device is WUSB, we already assigned an 29686c529cdcSInaky Perez-Gonzalez * unauthorized address in the Connect Ack sequence; 29696c529cdcSInaky Perez-Gonzalez * authorization will assign the final address. 29706c529cdcSInaky Perez-Gonzalez */ 29716c529cdcSInaky Perez-Gonzalez if (udev->wusb == 0) { 29721da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 29734326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 29741da177e4SLinus Torvalds if (retval >= 0) 29751da177e4SLinus Torvalds break; 29761da177e4SLinus Torvalds msleep(200); 29771da177e4SLinus Torvalds } 29781da177e4SLinus Torvalds if (retval < 0) { 29791da177e4SLinus Torvalds dev_err(&udev->dev, 29801da177e4SLinus Torvalds "device not accepting address %d, error %d\n", 29814326ed0bSAlan Stern devnum, retval); 29821da177e4SLinus Torvalds goto fail; 29831da177e4SLinus Torvalds } 2984c6515272SSarah Sharp if (udev->speed == USB_SPEED_SUPER) { 2985c6515272SSarah Sharp devnum = udev->devnum; 2986c6515272SSarah Sharp dev_info(&udev->dev, 29873b29b68bSAlan Stern "%s SuperSpeed USB device number %d using %s\n", 2988c6515272SSarah Sharp (udev->config) ? "reset" : "new", 29893b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 2990c6515272SSarah Sharp } 29911da177e4SLinus Torvalds 29921da177e4SLinus Torvalds /* cope with hardware quirkiness: 29931da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 29941da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 29951da177e4SLinus Torvalds */ 29961da177e4SLinus Torvalds msleep(10); 2997c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) 29981da177e4SLinus Torvalds break; 29996c529cdcSInaky Perez-Gonzalez } 30001da177e4SLinus Torvalds 30011da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 30021da177e4SLinus Torvalds if (retval < 8) { 3003b9cef6c3SWu Fengguang dev_err(&udev->dev, 3004b9cef6c3SWu Fengguang "device descriptor read/8, error %d\n", 3005b9cef6c3SWu Fengguang retval); 30061da177e4SLinus Torvalds if (retval >= 0) 30071da177e4SLinus Torvalds retval = -EMSGSIZE; 30081da177e4SLinus Torvalds } else { 30091da177e4SLinus Torvalds retval = 0; 30101da177e4SLinus Torvalds break; 30111da177e4SLinus Torvalds } 30121da177e4SLinus Torvalds } 30131da177e4SLinus Torvalds if (retval) 30141da177e4SLinus Torvalds goto fail; 30151da177e4SLinus Torvalds 30166b403b02SSarah Sharp if (udev->descriptor.bMaxPacketSize0 == 0xff || 30176b403b02SSarah Sharp udev->speed == USB_SPEED_SUPER) 30186b403b02SSarah Sharp i = 512; 30196b403b02SSarah Sharp else 30206b403b02SSarah Sharp i = udev->descriptor.bMaxPacketSize0; 302129cc8897SKuninori Morimoto if (usb_endpoint_maxp(&udev->ep0.desc) != i) { 302256626a72SAlan Stern if (udev->speed == USB_SPEED_LOW || 30231da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 302456626a72SAlan Stern dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); 30251da177e4SLinus Torvalds retval = -EMSGSIZE; 30261da177e4SLinus Torvalds goto fail; 30271da177e4SLinus Torvalds } 302856626a72SAlan Stern if (udev->speed == USB_SPEED_FULL) 30291da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 303056626a72SAlan Stern else 303156626a72SAlan Stern dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); 30321da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 3033fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 30341da177e4SLinus Torvalds } 30351da177e4SLinus Torvalds 30361da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 30371da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 3038b9cef6c3SWu Fengguang dev_err(&udev->dev, "device descriptor read/all, error %d\n", 3039b9cef6c3SWu Fengguang retval); 30401da177e4SLinus Torvalds if (retval >= 0) 30411da177e4SLinus Torvalds retval = -ENOMSG; 30421da177e4SLinus Torvalds goto fail; 30431da177e4SLinus Torvalds } 30441da177e4SLinus Torvalds 30451da177e4SLinus Torvalds retval = 0; 304648f24970SAlek Du /* notify HCD that we have a device connected and addressed */ 304748f24970SAlek Du if (hcd->driver->update_device) 304848f24970SAlek Du hcd->driver->update_device(hcd, udev); 30491da177e4SLinus Torvalds fail: 30504326ed0bSAlan Stern if (retval) { 30511da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 30523b29b68bSAlan Stern update_devnum(udev, devnum); /* for disconnect processing */ 30534326ed0bSAlan Stern } 30544186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 30551da177e4SLinus Torvalds return retval; 30561da177e4SLinus Torvalds } 30571da177e4SLinus Torvalds 30581da177e4SLinus Torvalds static void 30591da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 30601da177e4SLinus Torvalds { 30611da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 30621da177e4SLinus Torvalds int status; 30631da177e4SLinus Torvalds 3064e94b1766SChristoph Lameter qual = kmalloc (sizeof *qual, GFP_KERNEL); 30651da177e4SLinus Torvalds if (qual == NULL) 30661da177e4SLinus Torvalds return; 30671da177e4SLinus Torvalds 30681da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 30691da177e4SLinus Torvalds qual, sizeof *qual); 30701da177e4SLinus Torvalds if (status == sizeof *qual) { 30711da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 30721da177e4SLinus Torvalds "connect to a high speed hub\n"); 30731da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 30741da177e4SLinus Torvalds if (hub->has_indicators) { 30751da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 3076c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 30771da177e4SLinus Torvalds } 30781da177e4SLinus Torvalds } 30791da177e4SLinus Torvalds kfree(qual); 30801da177e4SLinus Torvalds } 30811da177e4SLinus Torvalds 30821da177e4SLinus Torvalds static unsigned 30831da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 30841da177e4SLinus Torvalds { 30851da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 30861da177e4SLinus Torvalds int remaining; 308755c52718SAlan Stern int port1; 30881da177e4SLinus Torvalds 308955c52718SAlan Stern if (!hub->limited_power) 30901da177e4SLinus Torvalds return 0; 30911da177e4SLinus Torvalds 309255c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 309355c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 309455c52718SAlan Stern struct usb_device *udev = hdev->children[port1 - 1]; 309555c52718SAlan Stern int delta; 30961da177e4SLinus Torvalds 30971da177e4SLinus Torvalds if (!udev) 30981da177e4SLinus Torvalds continue; 30991da177e4SLinus Torvalds 310055c52718SAlan Stern /* Unconfigured devices may not use more than 100mA, 310155c52718SAlan Stern * or 8mA for OTG ports */ 31021da177e4SLinus Torvalds if (udev->actconfig) 310355c52718SAlan Stern delta = udev->actconfig->desc.bMaxPower * 2; 310455c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 310555c52718SAlan Stern delta = 100; 31061da177e4SLinus Torvalds else 310755c52718SAlan Stern delta = 8; 310855c52718SAlan Stern if (delta > hub->mA_per_port) 3109b9cef6c3SWu Fengguang dev_warn(&udev->dev, 3110b9cef6c3SWu Fengguang "%dmA is over %umA budget for port %d!\n", 311155c52718SAlan Stern delta, hub->mA_per_port, port1); 31121da177e4SLinus Torvalds remaining -= delta; 31131da177e4SLinus Torvalds } 31141da177e4SLinus Torvalds if (remaining < 0) { 311555c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 311655c52718SAlan Stern - remaining); 31171da177e4SLinus Torvalds remaining = 0; 31181da177e4SLinus Torvalds } 31191da177e4SLinus Torvalds return remaining; 31201da177e4SLinus Torvalds } 31211da177e4SLinus Torvalds 31221da177e4SLinus Torvalds /* Handle physical or logical connection change events. 31231da177e4SLinus Torvalds * This routine is called when: 31241da177e4SLinus Torvalds * a port connection-change occurs; 31251da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 3126742120c6SMing Lei * usb_reset_and_verify_device() encounters changed descriptors (as from 31271da177e4SLinus Torvalds * a firmware download) 31281da177e4SLinus Torvalds * caller already locked the hub 31291da177e4SLinus Torvalds */ 31301da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 31311da177e4SLinus Torvalds u16 portstatus, u16 portchange) 31321da177e4SLinus Torvalds { 31331da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 31341da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 313590da096eSBalaji Rao struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 313624618b0cSAlan Stern unsigned wHubCharacteristics = 313724618b0cSAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 31388808f00cSAlan Stern struct usb_device *udev; 31391da177e4SLinus Torvalds int status, i; 31401da177e4SLinus Torvalds 31411da177e4SLinus Torvalds dev_dbg (hub_dev, 31421da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 3143131dec34SSarah Sharp port1, portstatus, portchange, portspeed(hub, portstatus)); 31441da177e4SLinus Torvalds 31451da177e4SLinus Torvalds if (hub->has_indicators) { 31461da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 31471da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 31481da177e4SLinus Torvalds } 31491da177e4SLinus Torvalds 31501da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 31511da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 31521da177e4SLinus Torvalds if (hdev->bus->is_b_host) 315324618b0cSAlan Stern portchange &= ~(USB_PORT_STAT_C_CONNECTION | 315424618b0cSAlan Stern USB_PORT_STAT_C_ENABLE); 31551da177e4SLinus Torvalds #endif 31561da177e4SLinus Torvalds 31578808f00cSAlan Stern /* Try to resuscitate an existing device */ 31588808f00cSAlan Stern udev = hdev->children[port1-1]; 31598808f00cSAlan Stern if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && 31608808f00cSAlan Stern udev->state != USB_STATE_NOTATTACHED) { 31618808f00cSAlan Stern usb_lock_device(udev); 31628808f00cSAlan Stern if (portstatus & USB_PORT_STAT_ENABLE) { 31638808f00cSAlan Stern status = 0; /* Nothing to do */ 31648808f00cSAlan Stern 31658808f00cSAlan Stern #ifdef CONFIG_USB_SUSPEND 31665257d97aSAlan Stern } else if (udev->state == USB_STATE_SUSPENDED && 31675257d97aSAlan Stern udev->persist_enabled) { 31688808f00cSAlan Stern /* For a suspended device, treat this as a 31698808f00cSAlan Stern * remote wakeup event. 31708808f00cSAlan Stern */ 31710534d468SAlan Stern status = usb_remote_wakeup(udev); 31728808f00cSAlan Stern #endif 31738808f00cSAlan Stern 31748808f00cSAlan Stern } else { 31755257d97aSAlan Stern status = -ENODEV; /* Don't resuscitate */ 31768808f00cSAlan Stern } 31778808f00cSAlan Stern usb_unlock_device(udev); 31788808f00cSAlan Stern 31798808f00cSAlan Stern if (status == 0) { 31808808f00cSAlan Stern clear_bit(port1, hub->change_bits); 31818808f00cSAlan Stern return; 31828808f00cSAlan Stern } 31838808f00cSAlan Stern } 31848808f00cSAlan Stern 318524618b0cSAlan Stern /* Disconnect any existing devices under this port */ 31868808f00cSAlan Stern if (udev) 318724618b0cSAlan Stern usb_disconnect(&hdev->children[port1-1]); 318824618b0cSAlan Stern clear_bit(port1, hub->change_bits); 318924618b0cSAlan Stern 3190253e0572SAlan Stern /* We can forget about a "removed" device when there's a physical 3191253e0572SAlan Stern * disconnect or the connect status changes. 3192253e0572SAlan Stern */ 3193253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 3194253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 3195253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 3196253e0572SAlan Stern 31975257d97aSAlan Stern if (portchange & (USB_PORT_STAT_C_CONNECTION | 31985257d97aSAlan Stern USB_PORT_STAT_C_ENABLE)) { 31995257d97aSAlan Stern status = hub_port_debounce(hub, port1); 32005257d97aSAlan Stern if (status < 0) { 32015257d97aSAlan Stern if (printk_ratelimit()) 32025257d97aSAlan Stern dev_err(hub_dev, "connect-debounce failed, " 32035257d97aSAlan Stern "port %d disabled\n", port1); 32045257d97aSAlan Stern portstatus &= ~USB_PORT_STAT_CONNECTION; 32055257d97aSAlan Stern } else { 32065257d97aSAlan Stern portstatus = status; 32075257d97aSAlan Stern } 32085257d97aSAlan Stern } 32095257d97aSAlan Stern 3210253e0572SAlan Stern /* Return now if debouncing failed or nothing is connected or 3211253e0572SAlan Stern * the device was "removed". 3212253e0572SAlan Stern */ 3213253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 3214253e0572SAlan Stern test_bit(port1, hub->removed_bits)) { 32151da177e4SLinus Torvalds 32161da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 321774ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 32180ed9a57eSAndiry Xu && !port_is_power_on(hub, portstatus)) 32191da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 32201da177e4SLinus Torvalds 32211da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 32221da177e4SLinus Torvalds goto done; 32231da177e4SLinus Torvalds return; 32241da177e4SLinus Torvalds } 32251da177e4SLinus Torvalds 32261da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 32271da177e4SLinus Torvalds 32281da177e4SLinus Torvalds /* reallocate for each attempt, since references 32291da177e4SLinus Torvalds * to the previous one can escape in various ways 32301da177e4SLinus Torvalds */ 32311da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 32321da177e4SLinus Torvalds if (!udev) { 32331da177e4SLinus Torvalds dev_err (hub_dev, 32341da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 32351da177e4SLinus Torvalds port1); 32361da177e4SLinus Torvalds goto done; 32371da177e4SLinus Torvalds } 32381da177e4SLinus Torvalds 32391da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 324055c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 3241b6956ffaSAlan Stern udev->level = hdev->level + 1; 32428af548dcSInaky Perez-Gonzalez udev->wusb = hub_is_wusb(hub); 32431da177e4SLinus Torvalds 3244131dec34SSarah Sharp /* Only USB 3.0 devices are connected to SuperSpeed hubs. */ 3245131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 3246e7b77172SSarah Sharp udev->speed = USB_SPEED_SUPER; 3247e7b77172SSarah Sharp else 3248e7b77172SSarah Sharp udev->speed = USB_SPEED_UNKNOWN; 3249e7b77172SSarah Sharp 32503b29b68bSAlan Stern choose_devnum(udev); 3251c6515272SSarah Sharp if (udev->devnum <= 0) { 3252c6515272SSarah Sharp status = -ENOTCONN; /* Don't retry */ 3253c6515272SSarah Sharp goto loop; 3254c6515272SSarah Sharp } 3255c6515272SSarah Sharp 3256e7b77172SSarah Sharp /* reset (non-USB 3.0 devices) and get descriptor */ 32571da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 32581da177e4SLinus Torvalds if (status < 0) 32591da177e4SLinus Torvalds goto loop; 32601da177e4SLinus Torvalds 326193362a87SPhil Dibowitz usb_detect_quirks(udev); 326293362a87SPhil Dibowitz if (udev->quirks & USB_QUIRK_DELAY_INIT) 326393362a87SPhil Dibowitz msleep(1000); 326493362a87SPhil Dibowitz 32651da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 32661da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 32671da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 32681da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 32691da177e4SLinus Torvalds * on the parent. 32701da177e4SLinus Torvalds */ 32711da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 327255c52718SAlan Stern && udev->bus_mA <= 100) { 32731da177e4SLinus Torvalds u16 devstat; 32741da177e4SLinus Torvalds 32751da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 32761da177e4SLinus Torvalds &devstat); 327755c52718SAlan Stern if (status < 2) { 32781da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 32791da177e4SLinus Torvalds goto loop_disable; 32801da177e4SLinus Torvalds } 328155c52718SAlan Stern le16_to_cpus(&devstat); 32821da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 32831da177e4SLinus Torvalds dev_err(&udev->dev, 32841da177e4SLinus Torvalds "can't connect bus-powered hub " 32851da177e4SLinus Torvalds "to this port\n"); 32861da177e4SLinus Torvalds if (hub->has_indicators) { 32871da177e4SLinus Torvalds hub->indicator[port1-1] = 32881da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 3289c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 32901da177e4SLinus Torvalds } 32911da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 32921da177e4SLinus Torvalds goto loop_disable; 32931da177e4SLinus Torvalds } 32941da177e4SLinus Torvalds } 32951da177e4SLinus Torvalds 32961da177e4SLinus Torvalds /* check for devices running slower than they could */ 32971da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 32981da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 32991da177e4SLinus Torvalds && highspeed_hubs != 0) 33001da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 33011da177e4SLinus Torvalds 33021da177e4SLinus Torvalds /* Store the parent's children[] pointer. At this point 33031da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 33041da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 33051da177e4SLinus Torvalds */ 33061da177e4SLinus Torvalds status = 0; 33071da177e4SLinus Torvalds 33081da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 33091da177e4SLinus Torvalds * been disconnected; we would race with the 33101da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 33111da177e4SLinus Torvalds */ 33121da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 33131da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 33141da177e4SLinus Torvalds status = -ENOTCONN; 33151da177e4SLinus Torvalds else 33161da177e4SLinus Torvalds hdev->children[port1-1] = udev; 33171da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 33181da177e4SLinus Torvalds 33191da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 33201da177e4SLinus Torvalds if (!status) { 33211da177e4SLinus Torvalds status = usb_new_device(udev); 33221da177e4SLinus Torvalds if (status) { 33231da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 33241da177e4SLinus Torvalds hdev->children[port1-1] = NULL; 33251da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 33261da177e4SLinus Torvalds } 33271da177e4SLinus Torvalds } 33281da177e4SLinus Torvalds 33291da177e4SLinus Torvalds if (status) 33301da177e4SLinus Torvalds goto loop_disable; 33311da177e4SLinus Torvalds 33321da177e4SLinus Torvalds status = hub_power_remaining(hub); 33331da177e4SLinus Torvalds if (status) 333455c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 33351da177e4SLinus Torvalds 33361da177e4SLinus Torvalds return; 33371da177e4SLinus Torvalds 33381da177e4SLinus Torvalds loop_disable: 33391da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 33401da177e4SLinus Torvalds loop: 3341fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 33423b29b68bSAlan Stern release_devnum(udev); 3343f7410cedSHerbert Xu hub_free_dev(udev); 33441da177e4SLinus Torvalds usb_put_dev(udev); 3345ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 33461da177e4SLinus Torvalds break; 33471da177e4SLinus Torvalds } 33483a31155cSAlan Stern if (hub->hdev->parent || 33493a31155cSAlan Stern !hcd->driver->port_handed_over || 33503a31155cSAlan Stern !(hcd->driver->port_handed_over)(hcd, port1)) 33513a31155cSAlan Stern dev_err(hub_dev, "unable to enumerate USB device on port %d\n", 33523a31155cSAlan Stern port1); 33531da177e4SLinus Torvalds 33541da177e4SLinus Torvalds done: 33551da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 335690da096eSBalaji Rao if (hcd->driver->relinquish_port && !hub->hdev->parent) 335790da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 33581da177e4SLinus Torvalds } 33591da177e4SLinus Torvalds 33601da177e4SLinus Torvalds static void hub_events(void) 33611da177e4SLinus Torvalds { 33621da177e4SLinus Torvalds struct list_head *tmp; 33631da177e4SLinus Torvalds struct usb_device *hdev; 33641da177e4SLinus Torvalds struct usb_interface *intf; 33651da177e4SLinus Torvalds struct usb_hub *hub; 33661da177e4SLinus Torvalds struct device *hub_dev; 33671da177e4SLinus Torvalds u16 hubstatus; 33681da177e4SLinus Torvalds u16 hubchange; 33691da177e4SLinus Torvalds u16 portstatus; 33701da177e4SLinus Torvalds u16 portchange; 33711da177e4SLinus Torvalds int i, ret; 33721da177e4SLinus Torvalds int connect_change; 33731da177e4SLinus Torvalds 33741da177e4SLinus Torvalds /* 33751da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 33761da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 33771da177e4SLinus Torvalds * safe since we delete the hub from the event list. 33781da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 33791da177e4SLinus Torvalds */ 33801da177e4SLinus Torvalds while (1) { 33811da177e4SLinus Torvalds 33821da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 33831da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 33841da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 33851da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 33861da177e4SLinus Torvalds break; 33871da177e4SLinus Torvalds } 33881da177e4SLinus Torvalds 33891da177e4SLinus Torvalds tmp = hub_event_list.next; 33901da177e4SLinus Torvalds list_del_init(tmp); 33911da177e4SLinus Torvalds 33921da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 3393e8054854SAlan Stern kref_get(&hub->kref); 3394e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 33951da177e4SLinus Torvalds 3396e8054854SAlan Stern hdev = hub->hdev; 3397e8054854SAlan Stern hub_dev = hub->intfdev; 3398e8054854SAlan Stern intf = to_usb_interface(hub_dev); 339940f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 34001da177e4SLinus Torvalds hdev->state, hub->descriptor 34011da177e4SLinus Torvalds ? hub->descriptor->bNbrPorts 34021da177e4SLinus Torvalds : 0, 34031da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 34041da177e4SLinus Torvalds (u16) hub->change_bits[0], 340540f122f3SAlan Stern (u16) hub->event_bits[0]); 34061da177e4SLinus Torvalds 34071da177e4SLinus Torvalds /* Lock the device, then check to see if we were 34081da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 340906b84e8aSAlan Stern usb_lock_device(hdev); 3410e8054854SAlan Stern if (unlikely(hub->disconnected)) 34119bbdf1e0SAlan Stern goto loop_disconnected; 34121da177e4SLinus Torvalds 34131da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 34141da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 34157de18d8bSAlan Stern hub->error = -ENODEV; 34164330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 34171da177e4SLinus Torvalds goto loop; 34181da177e4SLinus Torvalds } 34191da177e4SLinus Torvalds 342040f122f3SAlan Stern /* Autoresume */ 342140f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 342240f122f3SAlan Stern if (ret) { 342340f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 34241da177e4SLinus Torvalds goto loop; 342540f122f3SAlan Stern } 342640f122f3SAlan Stern 342740f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 342840f122f3SAlan Stern if (hub->quiescing) 342940f122f3SAlan Stern goto loop_autopm; 34301da177e4SLinus Torvalds 34311da177e4SLinus Torvalds if (hub->error) { 34321da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 34331da177e4SLinus Torvalds hub->error); 34341da177e4SLinus Torvalds 3435742120c6SMing Lei ret = usb_reset_device(hdev); 34361da177e4SLinus Torvalds if (ret) { 34371da177e4SLinus Torvalds dev_dbg (hub_dev, 34381da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 343940f122f3SAlan Stern goto loop_autopm; 34401da177e4SLinus Torvalds } 34411da177e4SLinus Torvalds 34421da177e4SLinus Torvalds hub->nerrors = 0; 34431da177e4SLinus Torvalds hub->error = 0; 34441da177e4SLinus Torvalds } 34451da177e4SLinus Torvalds 34461da177e4SLinus Torvalds /* deal with port status changes */ 34471da177e4SLinus Torvalds for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { 34481da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 34491da177e4SLinus Torvalds continue; 34501da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 34511da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 34526ee0b270SAlan Stern !connect_change) 34531da177e4SLinus Torvalds continue; 34541da177e4SLinus Torvalds 34551da177e4SLinus Torvalds ret = hub_port_status(hub, i, 34561da177e4SLinus Torvalds &portstatus, &portchange); 34571da177e4SLinus Torvalds if (ret < 0) 34581da177e4SLinus Torvalds continue; 34591da177e4SLinus Torvalds 34601da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 34611da177e4SLinus Torvalds clear_port_feature(hdev, i, 34621da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 34631da177e4SLinus Torvalds connect_change = 1; 34641da177e4SLinus Torvalds } 34651da177e4SLinus Torvalds 34661da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 34671da177e4SLinus Torvalds if (!connect_change) 34681da177e4SLinus Torvalds dev_dbg (hub_dev, 34691da177e4SLinus Torvalds "port %d enable change, " 34701da177e4SLinus Torvalds "status %08x\n", 34711da177e4SLinus Torvalds i, portstatus); 34721da177e4SLinus Torvalds clear_port_feature(hdev, i, 34731da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 34741da177e4SLinus Torvalds 34751da177e4SLinus Torvalds /* 34761da177e4SLinus Torvalds * EM interference sometimes causes badly 34771da177e4SLinus Torvalds * shielded USB devices to be shutdown by 34781da177e4SLinus Torvalds * the hub, this hack enables them again. 34791da177e4SLinus Torvalds * Works at least with mouse driver. 34801da177e4SLinus Torvalds */ 34811da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 34821da177e4SLinus Torvalds && !connect_change 34831da177e4SLinus Torvalds && hdev->children[i-1]) { 34841da177e4SLinus Torvalds dev_err (hub_dev, 34851da177e4SLinus Torvalds "port %i " 34861da177e4SLinus Torvalds "disabled by hub (EMI?), " 34871da177e4SLinus Torvalds "re-enabling...\n", 34881da177e4SLinus Torvalds i); 34891da177e4SLinus Torvalds connect_change = 1; 34901da177e4SLinus Torvalds } 34911da177e4SLinus Torvalds } 34921da177e4SLinus Torvalds 34931da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_SUSPEND) { 34948808f00cSAlan Stern struct usb_device *udev; 34958808f00cSAlan Stern 34961da177e4SLinus Torvalds clear_port_feature(hdev, i, 34971da177e4SLinus Torvalds USB_PORT_FEAT_C_SUSPEND); 34988808f00cSAlan Stern udev = hdev->children[i-1]; 34998808f00cSAlan Stern if (udev) { 350049d0f078SAlan Stern /* TRSMRCY = 10 msec */ 350149d0f078SAlan Stern msleep(10); 350249d0f078SAlan Stern 35038808f00cSAlan Stern usb_lock_device(udev); 35040534d468SAlan Stern ret = usb_remote_wakeup(hdev-> 35051da177e4SLinus Torvalds children[i-1]); 35068808f00cSAlan Stern usb_unlock_device(udev); 35071da177e4SLinus Torvalds if (ret < 0) 35081da177e4SLinus Torvalds connect_change = 1; 35091da177e4SLinus Torvalds } else { 35101da177e4SLinus Torvalds ret = -ENODEV; 35111da177e4SLinus Torvalds hub_port_disable(hub, i, 1); 35121da177e4SLinus Torvalds } 35131da177e4SLinus Torvalds dev_dbg (hub_dev, 35141da177e4SLinus Torvalds "resume on port %d, status %d\n", 35151da177e4SLinus Torvalds i, ret); 35161da177e4SLinus Torvalds } 35171da177e4SLinus Torvalds 35181da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 3519752d57a8SPaul Bolle u16 status = 0; 3520752d57a8SPaul Bolle u16 unused; 3521752d57a8SPaul Bolle 3522752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change on port " 3523752d57a8SPaul Bolle "%d\n", i); 35241da177e4SLinus Torvalds clear_port_feature(hdev, i, 35251da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 3526752d57a8SPaul Bolle msleep(100); /* Cool down */ 35278520f380SAlan Stern hub_power_on(hub, true); 3528752d57a8SPaul Bolle hub_port_status(hub, i, &status, &unused); 3529752d57a8SPaul Bolle if (status & USB_PORT_STAT_OVERCURRENT) 3530752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 3531752d57a8SPaul Bolle "condition on port %d\n", i); 35321da177e4SLinus Torvalds } 35331da177e4SLinus Torvalds 35341da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 35351da177e4SLinus Torvalds dev_dbg (hub_dev, 35361da177e4SLinus Torvalds "reset change on port %d\n", 35371da177e4SLinus Torvalds i); 35381da177e4SLinus Torvalds clear_port_feature(hdev, i, 35391da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 35401da177e4SLinus Torvalds } 3541c7061574SSarah Sharp if ((portchange & USB_PORT_STAT_C_BH_RESET) && 3542c7061574SSarah Sharp hub_is_superspeed(hub->hdev)) { 3543c7061574SSarah Sharp dev_dbg(hub_dev, 3544c7061574SSarah Sharp "warm reset change on port %d\n", 3545c7061574SSarah Sharp i); 3546c7061574SSarah Sharp clear_port_feature(hdev, i, 3547c7061574SSarah Sharp USB_PORT_FEAT_C_BH_PORT_RESET); 3548c7061574SSarah Sharp } 3549dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_LINK_STATE) { 3550dbe79bbeSJohn Youn clear_port_feature(hub->hdev, i, 3551dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_LINK_STATE); 3552dbe79bbeSJohn Youn } 3553dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { 3554dbe79bbeSJohn Youn dev_warn(hub_dev, 3555dbe79bbeSJohn Youn "config error on port %d\n", 3556dbe79bbeSJohn Youn i); 3557dbe79bbeSJohn Youn clear_port_feature(hub->hdev, i, 3558dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_CONFIG_ERROR); 3559dbe79bbeSJohn Youn } 35601da177e4SLinus Torvalds 35615e467f6eSAndiry Xu /* Warm reset a USB3 protocol port if it's in 35625e467f6eSAndiry Xu * SS.Inactive state. 35635e467f6eSAndiry Xu */ 35645e467f6eSAndiry Xu if (hub_is_superspeed(hub->hdev) && 35655e467f6eSAndiry Xu (portstatus & USB_PORT_STAT_LINK_STATE) 35665e467f6eSAndiry Xu == USB_SS_PORT_LS_SS_INACTIVE) { 35675e467f6eSAndiry Xu dev_dbg(hub_dev, "warm reset port %d\n", i); 35685e467f6eSAndiry Xu hub_port_warm_reset(hub, i); 35695e467f6eSAndiry Xu } 35705e467f6eSAndiry Xu 35711da177e4SLinus Torvalds if (connect_change) 35721da177e4SLinus Torvalds hub_port_connect_change(hub, i, 35731da177e4SLinus Torvalds portstatus, portchange); 35741da177e4SLinus Torvalds } /* end for i */ 35751da177e4SLinus Torvalds 35761da177e4SLinus Torvalds /* deal with hub status changes */ 35771da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 35781da177e4SLinus Torvalds ; /* do nothing */ 35791da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 35801da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 35811da177e4SLinus Torvalds else { 35821da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 35831da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 35841da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 358555c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 358655c52718SAlan Stern /* FIXME: Is this always true? */ 358755c52718SAlan Stern hub->limited_power = 1; 3588403fae78Sjidong xiao else 3589403fae78Sjidong xiao hub->limited_power = 0; 35901da177e4SLinus Torvalds } 35911da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 3592752d57a8SPaul Bolle u16 status = 0; 3593752d57a8SPaul Bolle u16 unused; 3594752d57a8SPaul Bolle 3595752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change\n"); 35961da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 3597752d57a8SPaul Bolle msleep(500); /* Cool down */ 35988520f380SAlan Stern hub_power_on(hub, true); 3599752d57a8SPaul Bolle hub_hub_status(hub, &status, &unused); 3600752d57a8SPaul Bolle if (status & HUB_STATUS_OVERCURRENT) 3601752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 3602752d57a8SPaul Bolle "condition\n"); 36031da177e4SLinus Torvalds } 36041da177e4SLinus Torvalds } 36051da177e4SLinus Torvalds 360640f122f3SAlan Stern loop_autopm: 36078e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface() above */ 36088e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 36091da177e4SLinus Torvalds loop: 36108e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface_no_resume() in 36118e4ceb38SAlan Stern * kick_khubd() and allow autosuspend. 36128e4ceb38SAlan Stern */ 36138e4ceb38SAlan Stern usb_autopm_put_interface(intf); 36149bbdf1e0SAlan Stern loop_disconnected: 36151da177e4SLinus Torvalds usb_unlock_device(hdev); 3616e8054854SAlan Stern kref_put(&hub->kref, hub_release); 36171da177e4SLinus Torvalds 36181da177e4SLinus Torvalds } /* end while (1) */ 36191da177e4SLinus Torvalds } 36201da177e4SLinus Torvalds 36211da177e4SLinus Torvalds static int hub_thread(void *__unused) 36221da177e4SLinus Torvalds { 36233bb1af52SAlan Stern /* khubd needs to be freezable to avoid intefering with USB-PERSIST 36243bb1af52SAlan Stern * port handover. Otherwise it might see that a full-speed device 36253bb1af52SAlan Stern * was gone before the EHCI controller had handed its port over to 36263bb1af52SAlan Stern * the companion full-speed controller. 36273bb1af52SAlan Stern */ 362883144186SRafael J. Wysocki set_freezable(); 36293bb1af52SAlan Stern 36301da177e4SLinus Torvalds do { 36311da177e4SLinus Torvalds hub_events(); 3632e42837bcSRafael J. Wysocki wait_event_freezable(khubd_wait, 36339c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 36349c8d6178Sakpm@osdl.org kthread_should_stop()); 36359c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 36361da177e4SLinus Torvalds 36371da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 36389c8d6178Sakpm@osdl.org return 0; 36391da177e4SLinus Torvalds } 36401da177e4SLinus Torvalds 36411e927d96SNémeth Márton static const struct usb_device_id hub_id_table[] = { 36421da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 36431da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 36441da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 36451da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 36461da177e4SLinus Torvalds { } /* Terminating entry */ 36471da177e4SLinus Torvalds }; 36481da177e4SLinus Torvalds 36491da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 36501da177e4SLinus Torvalds 36511da177e4SLinus Torvalds static struct usb_driver hub_driver = { 36521da177e4SLinus Torvalds .name = "hub", 36531da177e4SLinus Torvalds .probe = hub_probe, 36541da177e4SLinus Torvalds .disconnect = hub_disconnect, 36551da177e4SLinus Torvalds .suspend = hub_suspend, 36561da177e4SLinus Torvalds .resume = hub_resume, 3657f07600cfSAlan Stern .reset_resume = hub_reset_resume, 36587de18d8bSAlan Stern .pre_reset = hub_pre_reset, 36597de18d8bSAlan Stern .post_reset = hub_post_reset, 3660c532b29aSAndi Kleen .unlocked_ioctl = hub_ioctl, 36611da177e4SLinus Torvalds .id_table = hub_id_table, 366240f122f3SAlan Stern .supports_autosuspend = 1, 36631da177e4SLinus Torvalds }; 36641da177e4SLinus Torvalds 36651da177e4SLinus Torvalds int usb_hub_init(void) 36661da177e4SLinus Torvalds { 36671da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 36681da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 36691da177e4SLinus Torvalds usbcore_name); 36701da177e4SLinus Torvalds return -1; 36711da177e4SLinus Torvalds } 36721da177e4SLinus Torvalds 36739c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 36749c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 36751da177e4SLinus Torvalds return 0; 36761da177e4SLinus Torvalds 36771da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 36781da177e4SLinus Torvalds usb_deregister(&hub_driver); 36791da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 36801da177e4SLinus Torvalds 36811da177e4SLinus Torvalds return -1; 36821da177e4SLinus Torvalds } 36831da177e4SLinus Torvalds 36841da177e4SLinus Torvalds void usb_hub_cleanup(void) 36851da177e4SLinus Torvalds { 36869c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 36871da177e4SLinus Torvalds 36881da177e4SLinus Torvalds /* 36891da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 36901da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 36911da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 36921da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 36931da177e4SLinus Torvalds * individual hub resources. -greg 36941da177e4SLinus Torvalds */ 36951da177e4SLinus Torvalds usb_deregister(&hub_driver); 36961da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 36971da177e4SLinus Torvalds 3698eb764c4bSAlan Stern static int descriptors_changed(struct usb_device *udev, 3699eb764c4bSAlan Stern struct usb_device_descriptor *old_device_descriptor) 37001da177e4SLinus Torvalds { 3701eb764c4bSAlan Stern int changed = 0; 37021da177e4SLinus Torvalds unsigned index; 3703eb764c4bSAlan Stern unsigned serial_len = 0; 3704eb764c4bSAlan Stern unsigned len; 3705eb764c4bSAlan Stern unsigned old_length; 3706eb764c4bSAlan Stern int length; 3707eb764c4bSAlan Stern char *buf; 37081da177e4SLinus Torvalds 3709eb764c4bSAlan Stern if (memcmp(&udev->descriptor, old_device_descriptor, 3710eb764c4bSAlan Stern sizeof(*old_device_descriptor)) != 0) 3711eb764c4bSAlan Stern return 1; 3712eb764c4bSAlan Stern 3713eb764c4bSAlan Stern /* Since the idVendor, idProduct, and bcdDevice values in the 3714eb764c4bSAlan Stern * device descriptor haven't changed, we will assume the 3715eb764c4bSAlan Stern * Manufacturer and Product strings haven't changed either. 3716eb764c4bSAlan Stern * But the SerialNumber string could be different (e.g., a 3717eb764c4bSAlan Stern * different flash card of the same brand). 3718eb764c4bSAlan Stern */ 3719eb764c4bSAlan Stern if (udev->serial) 3720eb764c4bSAlan Stern serial_len = strlen(udev->serial) + 1; 3721eb764c4bSAlan Stern 3722eb764c4bSAlan Stern len = serial_len; 37231da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 3724eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 3725eb764c4bSAlan Stern len = max(len, old_length); 37261da177e4SLinus Torvalds } 3727eb764c4bSAlan Stern 37280cc1a51fSOliver Neukum buf = kmalloc(len, GFP_NOIO); 37291da177e4SLinus Torvalds if (buf == NULL) { 37301da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 37311da177e4SLinus Torvalds /* assume the worst */ 37321da177e4SLinus Torvalds return 1; 37331da177e4SLinus Torvalds } 37341da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 3735eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 37361da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 37371da177e4SLinus Torvalds old_length); 3738eb764c4bSAlan Stern if (length != old_length) { 37391da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 37401da177e4SLinus Torvalds index, length); 3741eb764c4bSAlan Stern changed = 1; 37421da177e4SLinus Torvalds break; 37431da177e4SLinus Torvalds } 37441da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 37451da177e4SLinus Torvalds != 0) { 37461da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 3747eb764c4bSAlan Stern index, 3748eb764c4bSAlan Stern ((struct usb_config_descriptor *) buf)-> 3749eb764c4bSAlan Stern bConfigurationValue); 3750eb764c4bSAlan Stern changed = 1; 37511da177e4SLinus Torvalds break; 37521da177e4SLinus Torvalds } 37531da177e4SLinus Torvalds } 3754eb764c4bSAlan Stern 3755eb764c4bSAlan Stern if (!changed && serial_len) { 3756eb764c4bSAlan Stern length = usb_string(udev, udev->descriptor.iSerialNumber, 3757eb764c4bSAlan Stern buf, serial_len); 3758eb764c4bSAlan Stern if (length + 1 != serial_len) { 3759eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string error %d\n", 3760eb764c4bSAlan Stern length); 3761eb764c4bSAlan Stern changed = 1; 3762eb764c4bSAlan Stern } else if (memcmp(buf, udev->serial, length) != 0) { 3763eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string changed\n"); 3764eb764c4bSAlan Stern changed = 1; 3765eb764c4bSAlan Stern } 3766eb764c4bSAlan Stern } 3767eb764c4bSAlan Stern 37681da177e4SLinus Torvalds kfree(buf); 3769eb764c4bSAlan Stern return changed; 37701da177e4SLinus Torvalds } 37711da177e4SLinus Torvalds 37721da177e4SLinus Torvalds /** 3773742120c6SMing Lei * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device 37741da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 37751da177e4SLinus Torvalds * 377679efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 377779efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 3778742120c6SMing Lei * Use usb_reset_device() instead. 37791da177e4SLinus Torvalds * 37801da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 37811da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 37821da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 37831da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 37841da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 37851da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 37861da177e4SLinus Torvalds * re-enumerated and probed all over again. 37871da177e4SLinus Torvalds * 37881da177e4SLinus Torvalds * Returns 0 if the reset succeeded, -ENODEV if the device has been 37891da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 37901da177e4SLinus Torvalds * if the reset wasn't even attempted. 37911da177e4SLinus Torvalds * 37921da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 37931da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 37941da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 37951da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 37966bc6cff5SAlan Stern * 37976bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 37986bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 37996bc6cff5SAlan Stern * holding the device lock because these tasks should always call 38006bc6cff5SAlan Stern * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. 38011da177e4SLinus Torvalds */ 3802742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev) 38031da177e4SLinus Torvalds { 38041da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 38051da177e4SLinus Torvalds struct usb_hub *parent_hub; 38063f0479e0SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 38071da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 380812c3da34SAlan Stern int i, ret = 0; 380912c3da34SAlan Stern int port1 = udev->portnum; 38101da177e4SLinus Torvalds 38111da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 38121da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 38131da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 38141da177e4SLinus Torvalds udev->state); 38151da177e4SLinus Torvalds return -EINVAL; 38161da177e4SLinus Torvalds } 38171da177e4SLinus Torvalds 38181da177e4SLinus Torvalds if (!parent_hdev) { 38194bec9917SWolfram Sang /* this requires hcd-specific logic; see ohci_restart() */ 3820441b62c1SHarvey Harrison dev_dbg(&udev->dev, "%s for root hub!\n", __func__); 38211da177e4SLinus Torvalds return -EISDIR; 38221da177e4SLinus Torvalds } 38231da177e4SLinus Torvalds parent_hub = hdev_to_hub(parent_hdev); 38241da177e4SLinus Torvalds 38251da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 38261da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 38271da177e4SLinus Torvalds 38281da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 38291da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 3830fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 38311da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 3832dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 38331da177e4SLinus Torvalds break; 38341da177e4SLinus Torvalds } 38351da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 3836d5cbad4bSAlan Stern 38371da177e4SLinus Torvalds if (ret < 0) 38381da177e4SLinus Torvalds goto re_enumerate; 38391da177e4SLinus Torvalds 38401da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 3841eb764c4bSAlan Stern if (descriptors_changed(udev, &descriptor)) { 38421da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 38431da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 38441da177e4SLinus Torvalds goto re_enumerate; 38451da177e4SLinus Torvalds } 38461da177e4SLinus Torvalds 38474fe0387aSAlan Stern /* Restore the device's previous configuration */ 38481da177e4SLinus Torvalds if (!udev->actconfig) 38491da177e4SLinus Torvalds goto done; 38503f0479e0SSarah Sharp 3851d673bfcbSSarah Sharp mutex_lock(hcd->bandwidth_mutex); 38523f0479e0SSarah Sharp ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); 38533f0479e0SSarah Sharp if (ret < 0) { 38543f0479e0SSarah Sharp dev_warn(&udev->dev, 38553f0479e0SSarah Sharp "Busted HC? Not enough HCD resources for " 38563f0479e0SSarah Sharp "old configuration.\n"); 3857d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 38583f0479e0SSarah Sharp goto re_enumerate; 38593f0479e0SSarah Sharp } 38601da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 38611da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 38621da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 38631da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 38641da177e4SLinus Torvalds if (ret < 0) { 38651da177e4SLinus Torvalds dev_err(&udev->dev, 38661da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 38671da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 3868d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 38691da177e4SLinus Torvalds goto re_enumerate; 38701da177e4SLinus Torvalds } 3871d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 38721da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 38731da177e4SLinus Torvalds 38744fe0387aSAlan Stern /* Put interfaces back into the same altsettings as before. 38754fe0387aSAlan Stern * Don't bother to send the Set-Interface request for interfaces 38764fe0387aSAlan Stern * that were already in altsetting 0; besides being unnecessary, 38774fe0387aSAlan Stern * many devices can't handle it. Instead just reset the host-side 38784fe0387aSAlan Stern * endpoint state. 38794fe0387aSAlan Stern */ 38801da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 38813f0479e0SSarah Sharp struct usb_host_config *config = udev->actconfig; 38823f0479e0SSarah Sharp struct usb_interface *intf = config->interface[i]; 38831da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 38841da177e4SLinus Torvalds 38851da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 38864fe0387aSAlan Stern if (desc->bAlternateSetting == 0) { 38874fe0387aSAlan Stern usb_disable_interface(udev, intf, true); 38884fe0387aSAlan Stern usb_enable_interface(udev, intf, true); 38894fe0387aSAlan Stern ret = 0; 38904fe0387aSAlan Stern } else { 389104a723eaSSarah Sharp /* Let the bandwidth allocation function know that this 389204a723eaSSarah Sharp * device has been reset, and it will have to use 389304a723eaSSarah Sharp * alternate setting 0 as the current alternate setting. 38943f0479e0SSarah Sharp */ 389504a723eaSSarah Sharp intf->resetting_device = 1; 38961da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 38971da177e4SLinus Torvalds desc->bAlternateSetting); 389804a723eaSSarah Sharp intf->resetting_device = 0; 38994fe0387aSAlan Stern } 39001da177e4SLinus Torvalds if (ret < 0) { 39011da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 39021da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 39031da177e4SLinus Torvalds desc->bInterfaceNumber, 39041da177e4SLinus Torvalds desc->bAlternateSetting, 39051da177e4SLinus Torvalds ret); 39061da177e4SLinus Torvalds goto re_enumerate; 39071da177e4SLinus Torvalds } 39081da177e4SLinus Torvalds } 39091da177e4SLinus Torvalds 39101da177e4SLinus Torvalds done: 39111da177e4SLinus Torvalds return 0; 39121da177e4SLinus Torvalds 39131da177e4SLinus Torvalds re_enumerate: 39141da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 39151da177e4SLinus Torvalds return -ENODEV; 39161da177e4SLinus Torvalds } 391779efa097SAlan Stern 391879efa097SAlan Stern /** 3919742120c6SMing Lei * usb_reset_device - warn interface drivers and perform a USB port reset 392079efa097SAlan Stern * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 392179efa097SAlan Stern * 392279efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 392379efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 392479efa097SAlan Stern * the reset is over (using their post_reset method). 392579efa097SAlan Stern * 3926742120c6SMing Lei * Return value is the same as for usb_reset_and_verify_device(). 392779efa097SAlan Stern * 392879efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 392979efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 393079efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 393179efa097SAlan Stern * the device using usb_lock_device_for_reset(). 393278d9a487SAlan Stern * 393378d9a487SAlan Stern * If an interface is currently being probed or disconnected, we assume 393478d9a487SAlan Stern * its driver knows how to handle resets. For all other interfaces, 393578d9a487SAlan Stern * if the driver doesn't have pre_reset and post_reset methods then 393678d9a487SAlan Stern * we attempt to unbind it and rebind afterward. 393779efa097SAlan Stern */ 3938742120c6SMing Lei int usb_reset_device(struct usb_device *udev) 393979efa097SAlan Stern { 394079efa097SAlan Stern int ret; 3941852c4b43SAlan Stern int i; 394279efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 394379efa097SAlan Stern 394479efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 394579efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 394679efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 394779efa097SAlan Stern udev->state); 394879efa097SAlan Stern return -EINVAL; 394979efa097SAlan Stern } 395079efa097SAlan Stern 3951645daaabSAlan Stern /* Prevent autosuspend during the reset */ 395294fcda1fSAlan Stern usb_autoresume_device(udev); 3953645daaabSAlan Stern 395479efa097SAlan Stern if (config) { 3955852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 3956852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 395779efa097SAlan Stern struct usb_driver *drv; 395878d9a487SAlan Stern int unbind = 0; 395979efa097SAlan Stern 3960852c4b43SAlan Stern if (cintf->dev.driver) { 396179efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 396278d9a487SAlan Stern if (drv->pre_reset && drv->post_reset) 396378d9a487SAlan Stern unbind = (drv->pre_reset)(cintf); 396478d9a487SAlan Stern else if (cintf->condition == 396578d9a487SAlan Stern USB_INTERFACE_BOUND) 396678d9a487SAlan Stern unbind = 1; 396778d9a487SAlan Stern if (unbind) 396878d9a487SAlan Stern usb_forced_unbind_intf(cintf); 396979efa097SAlan Stern } 397079efa097SAlan Stern } 397179efa097SAlan Stern } 397279efa097SAlan Stern 3973742120c6SMing Lei ret = usb_reset_and_verify_device(udev); 397479efa097SAlan Stern 397579efa097SAlan Stern if (config) { 3976852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 3977852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 397879efa097SAlan Stern struct usb_driver *drv; 397978d9a487SAlan Stern int rebind = cintf->needs_binding; 398079efa097SAlan Stern 398178d9a487SAlan Stern if (!rebind && cintf->dev.driver) { 398279efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 398379efa097SAlan Stern if (drv->post_reset) 398478d9a487SAlan Stern rebind = (drv->post_reset)(cintf); 398578d9a487SAlan Stern else if (cintf->condition == 398678d9a487SAlan Stern USB_INTERFACE_BOUND) 398778d9a487SAlan Stern rebind = 1; 398879efa097SAlan Stern } 39896c640945SAlan Stern if (ret == 0 && rebind) 399078d9a487SAlan Stern usb_rebind_intf(cintf); 399179efa097SAlan Stern } 399279efa097SAlan Stern } 399379efa097SAlan Stern 399494fcda1fSAlan Stern usb_autosuspend_device(udev); 399579efa097SAlan Stern return ret; 399679efa097SAlan Stern } 3997742120c6SMing Lei EXPORT_SYMBOL_GPL(usb_reset_device); 3998dc023dceSInaky Perez-Gonzalez 3999dc023dceSInaky Perez-Gonzalez 4000dc023dceSInaky Perez-Gonzalez /** 4001dc023dceSInaky Perez-Gonzalez * usb_queue_reset_device - Reset a USB device from an atomic context 4002dc023dceSInaky Perez-Gonzalez * @iface: USB interface belonging to the device to reset 4003dc023dceSInaky Perez-Gonzalez * 4004dc023dceSInaky Perez-Gonzalez * This function can be used to reset a USB device from an atomic 4005dc023dceSInaky Perez-Gonzalez * context, where usb_reset_device() won't work (as it blocks). 4006dc023dceSInaky Perez-Gonzalez * 4007dc023dceSInaky Perez-Gonzalez * Doing a reset via this method is functionally equivalent to calling 4008dc023dceSInaky Perez-Gonzalez * usb_reset_device(), except for the fact that it is delayed to a 4009dc023dceSInaky Perez-Gonzalez * workqueue. This means that any drivers bound to other interfaces 4010dc023dceSInaky Perez-Gonzalez * might be unbound, as well as users from usbfs in user space. 4011dc023dceSInaky Perez-Gonzalez * 4012dc023dceSInaky Perez-Gonzalez * Corner cases: 4013dc023dceSInaky Perez-Gonzalez * 4014dc023dceSInaky Perez-Gonzalez * - Scheduling two resets at the same time from two different drivers 4015dc023dceSInaky Perez-Gonzalez * attached to two different interfaces of the same device is 4016dc023dceSInaky Perez-Gonzalez * possible; depending on how the driver attached to each interface 4017dc023dceSInaky Perez-Gonzalez * handles ->pre_reset(), the second reset might happen or not. 4018dc023dceSInaky Perez-Gonzalez * 4019dc023dceSInaky Perez-Gonzalez * - If a driver is unbound and it had a pending reset, the reset will 4020dc023dceSInaky Perez-Gonzalez * be cancelled. 4021dc023dceSInaky Perez-Gonzalez * 4022dc023dceSInaky Perez-Gonzalez * - This function can be called during .probe() or .disconnect() 4023dc023dceSInaky Perez-Gonzalez * times. On return from .disconnect(), any pending resets will be 4024dc023dceSInaky Perez-Gonzalez * cancelled. 4025dc023dceSInaky Perez-Gonzalez * 4026dc023dceSInaky Perez-Gonzalez * There is no no need to lock/unlock the @reset_ws as schedule_work() 4027dc023dceSInaky Perez-Gonzalez * does its own. 4028dc023dceSInaky Perez-Gonzalez * 4029dc023dceSInaky Perez-Gonzalez * NOTE: We don't do any reference count tracking because it is not 4030dc023dceSInaky Perez-Gonzalez * needed. The lifecycle of the work_struct is tied to the 4031dc023dceSInaky Perez-Gonzalez * usb_interface. Before destroying the interface we cancel the 4032dc023dceSInaky Perez-Gonzalez * work_struct, so the fact that work_struct is queued and or 4033dc023dceSInaky Perez-Gonzalez * running means the interface (and thus, the device) exist and 4034dc023dceSInaky Perez-Gonzalez * are referenced. 4035dc023dceSInaky Perez-Gonzalez */ 4036dc023dceSInaky Perez-Gonzalez void usb_queue_reset_device(struct usb_interface *iface) 4037dc023dceSInaky Perez-Gonzalez { 4038dc023dceSInaky Perez-Gonzalez schedule_work(&iface->reset_ws); 4039dc023dceSInaky Perez-Gonzalez } 4040dc023dceSInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_queue_reset_device); 4041