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 if (!udev) { 1640441b62c1SHarvey Harrison pr_debug ("%s nodev\n", __func__); 16411da177e4SLinus Torvalds return; 16421da177e4SLinus Torvalds } 16431da177e4SLinus Torvalds 16441da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 16451da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 164625985edcSLucas De Marchi * this quiesces everything except pending urbs. 16471da177e4SLinus Torvalds */ 16481da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 16493b29b68bSAlan Stern dev_info(&udev->dev, "USB disconnect, device number %d\n", 16503b29b68bSAlan Stern udev->devnum); 16511da177e4SLinus Torvalds 16529ad3d6ccSAlan Stern usb_lock_device(udev); 16539ad3d6ccSAlan Stern 16541da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 16551da177e4SLinus Torvalds for (i = 0; i < USB_MAXCHILDREN; i++) { 16561da177e4SLinus Torvalds if (udev->children[i]) 16571da177e4SLinus Torvalds usb_disconnect(&udev->children[i]); 16581da177e4SLinus Torvalds } 16591da177e4SLinus Torvalds 16601da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 16611da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 16621da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 16631da177e4SLinus Torvalds */ 1664782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 1665fccf4e86SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 16661da177e4SLinus Torvalds usb_disable_device(udev, 0); 1667fccf4e86SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 1668cde217a5SAlan Stern usb_hcd_synchronize_unlinks(udev); 16691da177e4SLinus Torvalds 16703b23dd6fSAlan Stern usb_remove_ep_devs(&udev->ep0); 1671782da727SAlan Stern usb_unlock_device(udev); 16723099e75aSGreg Kroah-Hartman 1673782da727SAlan Stern /* Unregister the device. The device driver is responsible 16743b23dd6fSAlan Stern * for de-configuring the device and invoking the remove-device 16753b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 1676782da727SAlan Stern */ 1677782da727SAlan Stern device_del(&udev->dev); 1678782da727SAlan Stern 1679782da727SAlan Stern /* Free the device number and delete the parent's children[] 16801da177e4SLinus Torvalds * (or root_hub) pointer. 16811da177e4SLinus Torvalds */ 16823b29b68bSAlan Stern release_devnum(udev); 16831da177e4SLinus Torvalds 16841da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 16851da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 16861da177e4SLinus Torvalds *pdev = NULL; 16871da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 16881da177e4SLinus Torvalds 1689f7410cedSHerbert Xu hub_free_dev(udev); 1690f7410cedSHerbert Xu 1691782da727SAlan Stern put_device(&udev->dev); 16921da177e4SLinus Torvalds } 16931da177e4SLinus Torvalds 1694f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 16951da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 16961da177e4SLinus Torvalds { 16971da177e4SLinus Torvalds if (!string) 16981da177e4SLinus Torvalds return; 16991da177e4SLinus Torvalds dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); 17001da177e4SLinus Torvalds } 17011da177e4SLinus Torvalds 1702f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 1703f2a383e4SGreg Kroah-Hartman { 1704f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", 1705f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 1706f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idProduct)); 1707b9cef6c3SWu Fengguang dev_info(&udev->dev, 1708b9cef6c3SWu Fengguang "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", 1709f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 1710f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 1711f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 1712f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 1713f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 1714f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 1715f2a383e4SGreg Kroah-Hartman } 17161da177e4SLinus Torvalds #else 1717f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 17181da177e4SLinus Torvalds #endif 17191da177e4SLinus Torvalds 17201da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 17211da177e4SLinus Torvalds #include "otg_whitelist.h" 17221da177e4SLinus Torvalds #endif 17231da177e4SLinus Torvalds 17243ede760fSOliver Neukum /** 17258d8558d1SAlan Stern * usb_enumerate_device_otg - FIXME (usbcore-internal) 17263ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 17273ede760fSOliver Neukum * 17288d8558d1SAlan Stern * Finish enumeration for On-The-Go devices 17293ede760fSOliver Neukum */ 17308d8558d1SAlan Stern static int usb_enumerate_device_otg(struct usb_device *udev) 17311da177e4SLinus Torvalds { 1732d9d16e8aSInaky Perez-Gonzalez int err = 0; 17331da177e4SLinus Torvalds 17341da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 17351da177e4SLinus Torvalds /* 17361da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 17371da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 17381da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 17391da177e4SLinus Torvalds */ 17401da177e4SLinus Torvalds if (!udev->bus->is_b_host 17411da177e4SLinus Torvalds && udev->config 17421da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 17432eb5052eSFelipe Balbi struct usb_otg_descriptor *desc = NULL; 17441da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 17451da177e4SLinus Torvalds 17461da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 17471da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 17481da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 17491da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 17501da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 175112c3da34SAlan Stern unsigned port1 = udev->portnum; 17521da177e4SLinus Torvalds 17531da177e4SLinus Torvalds dev_info(&udev->dev, 17541da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 17551da177e4SLinus Torvalds (port1 == bus->otg_port) 17561da177e4SLinus Torvalds ? "" : "non-"); 17571da177e4SLinus Torvalds 17581da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 17591da177e4SLinus Torvalds if (port1 == bus->otg_port) 17601da177e4SLinus Torvalds bus->b_hnp_enable = 1; 17611da177e4SLinus Torvalds err = usb_control_msg(udev, 17621da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 17631da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 17641da177e4SLinus Torvalds bus->b_hnp_enable 17651da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 17661da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 17671da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 17681da177e4SLinus Torvalds if (err < 0) { 17691da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 17701da177e4SLinus Torvalds * customize to match your product. 17711da177e4SLinus Torvalds */ 17721da177e4SLinus Torvalds dev_info(&udev->dev, 1773b9cef6c3SWu Fengguang "can't set HNP mode: %d\n", 17741da177e4SLinus Torvalds err); 17751da177e4SLinus Torvalds bus->b_hnp_enable = 0; 17761da177e4SLinus Torvalds } 17771da177e4SLinus Torvalds } 17781da177e4SLinus Torvalds } 17791da177e4SLinus Torvalds } 17801da177e4SLinus Torvalds 17811da177e4SLinus Torvalds if (!is_targeted(udev)) { 17821da177e4SLinus Torvalds 17831da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 17841da177e4SLinus Torvalds * (Includes HNP test device.) 17851da177e4SLinus Torvalds */ 17861da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 1787634a84f8SDavid Brownell err = usb_port_suspend(udev, PMSG_SUSPEND); 17881da177e4SLinus Torvalds if (err < 0) 17891da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 17901da177e4SLinus Torvalds } 1791ffcdc18dSVikram Pandita err = -ENOTSUPP; 17921da177e4SLinus Torvalds goto fail; 17931da177e4SLinus Torvalds } 1794d9d16e8aSInaky Perez-Gonzalez fail: 17951da177e4SLinus Torvalds #endif 1796d9d16e8aSInaky Perez-Gonzalez return err; 1797d9d16e8aSInaky Perez-Gonzalez } 17981da177e4SLinus Torvalds 1799d9d16e8aSInaky Perez-Gonzalez 1800d9d16e8aSInaky Perez-Gonzalez /** 18018d8558d1SAlan Stern * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) 1802d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 1803d9d16e8aSInaky Perez-Gonzalez * 1804d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 1805d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 1806d9d16e8aSInaky Perez-Gonzalez * environment. 1807d9d16e8aSInaky Perez-Gonzalez * 1808d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 1809d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 1810d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 1811d9d16e8aSInaky Perez-Gonzalez */ 18128d8558d1SAlan Stern static int usb_enumerate_device(struct usb_device *udev) 1813d9d16e8aSInaky Perez-Gonzalez { 1814d9d16e8aSInaky Perez-Gonzalez int err; 1815d9d16e8aSInaky Perez-Gonzalez 1816d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 1817d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 1818d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 1819d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 1820d9d16e8aSInaky Perez-Gonzalez err); 1821d9d16e8aSInaky Perez-Gonzalez goto fail; 1822d9d16e8aSInaky Perez-Gonzalez } 1823d9d16e8aSInaky Perez-Gonzalez } 1824d9d16e8aSInaky Perez-Gonzalez if (udev->wusb == 1 && udev->authorized == 0) { 1825d9d16e8aSInaky Perez-Gonzalez udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1826d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1827d9d16e8aSInaky Perez-Gonzalez udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1828d9d16e8aSInaky Perez-Gonzalez } 1829d9d16e8aSInaky Perez-Gonzalez else { 1830d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 1831d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 1832d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 1833d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 1834d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 1835d9d16e8aSInaky Perez-Gonzalez } 18368d8558d1SAlan Stern err = usb_enumerate_device_otg(udev); 1837d9d16e8aSInaky Perez-Gonzalez fail: 1838d9d16e8aSInaky Perez-Gonzalez return err; 1839d9d16e8aSInaky Perez-Gonzalez } 1840d9d16e8aSInaky Perez-Gonzalez 1841d9d16e8aSInaky Perez-Gonzalez 1842d9d16e8aSInaky Perez-Gonzalez /** 1843d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 1844d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 1845d9d16e8aSInaky Perez-Gonzalez * 18468d8558d1SAlan Stern * This is called with devices which have been detected but not fully 18478d8558d1SAlan Stern * enumerated. The device descriptor is available, but not descriptors 1848d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 1849d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 1850d9d16e8aSInaky Perez-Gonzalez * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 1851d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 1852d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 1853d9d16e8aSInaky Perez-Gonzalez * 1854d9d16e8aSInaky Perez-Gonzalez * It will return if the device is configured properly or not. Zero if 1855d9d16e8aSInaky Perez-Gonzalez * the interface was registered with the driver core; else a negative 1856d9d16e8aSInaky Perez-Gonzalez * errno value. 1857d9d16e8aSInaky Perez-Gonzalez * 1858d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 1859d9d16e8aSInaky Perez-Gonzalez * 1860d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 1861d9d16e8aSInaky Perez-Gonzalez */ 1862d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 1863d9d16e8aSInaky Perez-Gonzalez { 1864d9d16e8aSInaky Perez-Gonzalez int err; 1865d9d16e8aSInaky Perez-Gonzalez 186616985408SDan Streetman if (udev->parent) { 186716985408SDan Streetman /* Initialize non-root-hub device wakeup to disabled; 186816985408SDan Streetman * device (un)configuration controls wakeup capable 186916985408SDan Streetman * sysfs power/wakeup controls wakeup enabled/disabled 187016985408SDan Streetman */ 187116985408SDan Streetman device_init_wakeup(&udev->dev, 0); 187216985408SDan Streetman } 187316985408SDan Streetman 18749bbdf1e0SAlan Stern /* Tell the runtime-PM framework the device is active */ 18759bbdf1e0SAlan Stern pm_runtime_set_active(&udev->dev); 1876c08512c7SAlan Stern pm_runtime_get_noresume(&udev->dev); 1877fcc4a01eSAlan Stern pm_runtime_use_autosuspend(&udev->dev); 18789bbdf1e0SAlan Stern pm_runtime_enable(&udev->dev); 18799bbdf1e0SAlan Stern 1880c08512c7SAlan Stern /* By default, forbid autosuspend for all devices. It will be 1881c08512c7SAlan Stern * allowed for hubs during binding. 1882c08512c7SAlan Stern */ 1883c08512c7SAlan Stern usb_disable_autosuspend(udev); 1884c08512c7SAlan Stern 18858d8558d1SAlan Stern err = usb_enumerate_device(udev); /* Read descriptors */ 1886d9d16e8aSInaky Perez-Gonzalez if (err < 0) 1887d9d16e8aSInaky Perez-Gonzalez goto fail; 1888c6515272SSarah Sharp dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", 1889c6515272SSarah Sharp udev->devnum, udev->bus->busnum, 1890c6515272SSarah Sharp (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 18919f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 18929f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 18939f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 18949f8b17e6SKay Sievers 18956cd13201SAlan Stern /* Tell the world! */ 18966cd13201SAlan Stern announce_device(udev); 1897195af2ccSAlan Stern 1898927bc916SRafael J. Wysocki device_enable_async_suspend(&udev->dev); 1899782da727SAlan Stern /* Register the device. The device driver is responsible 19003b23dd6fSAlan Stern * for configuring the device and invoking the add-device 19013b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 1902782da727SAlan Stern */ 19031da177e4SLinus Torvalds err = device_add(&udev->dev); 19041da177e4SLinus Torvalds if (err) { 19051da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 19061da177e4SLinus Torvalds goto fail; 19071da177e4SLinus Torvalds } 19089ad3d6ccSAlan Stern 19093b23dd6fSAlan Stern (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); 1910c08512c7SAlan Stern usb_mark_last_busy(udev); 1911c08512c7SAlan Stern pm_runtime_put_sync_autosuspend(&udev->dev); 1912c066475eSGreg Kroah-Hartman return err; 19131da177e4SLinus Torvalds 19141da177e4SLinus Torvalds fail: 19151da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 19169bbdf1e0SAlan Stern pm_runtime_disable(&udev->dev); 19179bbdf1e0SAlan Stern pm_runtime_set_suspended(&udev->dev); 1918d9d16e8aSInaky Perez-Gonzalez return err; 19191da177e4SLinus Torvalds } 19201da177e4SLinus Torvalds 192193993a0aSInaky Perez-Gonzalez 192293993a0aSInaky Perez-Gonzalez /** 1923fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 1924fd39c86bSRandy Dunlap * @usb_dev: USB device 1925fd39c86bSRandy Dunlap * 1926fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 1927fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 192893993a0aSInaky Perez-Gonzalez * 192993993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 193093993a0aSInaky Perez-Gonzalez * defer its call. 193193993a0aSInaky Perez-Gonzalez */ 193293993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 193393993a0aSInaky Perez-Gonzalez { 193493993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 193593993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 193693993a0aSInaky Perez-Gonzalez goto out_unauthorized; 1937da307123SAlan Stern 193893993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 193993993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 1940da307123SAlan Stern 1941da307123SAlan Stern kfree(usb_dev->product); 194293993a0aSInaky Perez-Gonzalez usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1943da307123SAlan Stern kfree(usb_dev->manufacturer); 194493993a0aSInaky Perez-Gonzalez usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1945da307123SAlan Stern kfree(usb_dev->serial); 194693993a0aSInaky Perez-Gonzalez usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1947da307123SAlan Stern 1948da307123SAlan Stern usb_destroy_configuration(usb_dev); 194993993a0aSInaky Perez-Gonzalez usb_dev->descriptor.bNumConfigurations = 0; 1950da307123SAlan Stern 195193993a0aSInaky Perez-Gonzalez out_unauthorized: 195293993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 195393993a0aSInaky Perez-Gonzalez return 0; 195493993a0aSInaky Perez-Gonzalez } 195593993a0aSInaky Perez-Gonzalez 195693993a0aSInaky Perez-Gonzalez 195793993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 195893993a0aSInaky Perez-Gonzalez { 195993993a0aSInaky Perez-Gonzalez int result = 0, c; 1960da307123SAlan Stern 196193993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 196293993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 196393993a0aSInaky Perez-Gonzalez goto out_authorized; 1964da307123SAlan Stern 196593993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 196693993a0aSInaky Perez-Gonzalez if (result < 0) { 196793993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 196893993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 196993993a0aSInaky Perez-Gonzalez goto error_autoresume; 197093993a0aSInaky Perez-Gonzalez } 197193993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 197293993a0aSInaky Perez-Gonzalez if (result < 0) { 197393993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 197493993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 197593993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 197693993a0aSInaky Perez-Gonzalez } 1977da307123SAlan Stern 1978da307123SAlan Stern kfree(usb_dev->product); 1979da307123SAlan Stern usb_dev->product = NULL; 1980da307123SAlan Stern kfree(usb_dev->manufacturer); 1981da307123SAlan Stern usb_dev->manufacturer = NULL; 1982da307123SAlan Stern kfree(usb_dev->serial); 1983da307123SAlan Stern usb_dev->serial = NULL; 1984da307123SAlan Stern 198593993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 19868d8558d1SAlan Stern result = usb_enumerate_device(usb_dev); 198793993a0aSInaky Perez-Gonzalez if (result < 0) 19888d8558d1SAlan Stern goto error_enumerate; 198993993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 199093993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 199193993a0aSInaky Perez-Gonzalez */ 1992b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 199393993a0aSInaky Perez-Gonzalez if (c >= 0) { 199493993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 199593993a0aSInaky Perez-Gonzalez if (result) { 199693993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 199793993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 199893993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 199993993a0aSInaky Perez-Gonzalez * set other configurations. */ 200093993a0aSInaky Perez-Gonzalez } 200193993a0aSInaky Perez-Gonzalez } 200293993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 2003da307123SAlan Stern 20048d8558d1SAlan Stern error_enumerate: 200593993a0aSInaky Perez-Gonzalez error_device_descriptor: 2006da307123SAlan Stern usb_autosuspend_device(usb_dev); 200793993a0aSInaky Perez-Gonzalez error_autoresume: 200893993a0aSInaky Perez-Gonzalez out_authorized: 200993993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); // complements locktree 201093993a0aSInaky Perez-Gonzalez return result; 201193993a0aSInaky Perez-Gonzalez } 201293993a0aSInaky Perez-Gonzalez 201393993a0aSInaky Perez-Gonzalez 20140165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 20150165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 20160165de09SInaky Perez-Gonzalez { 20170165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 20180165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 20190165de09SInaky Perez-Gonzalez return 0; 20200165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 20210165de09SInaky Perez-Gonzalez return hcd->wireless; 20220165de09SInaky Perez-Gonzalez } 20230165de09SInaky Perez-Gonzalez 20240165de09SInaky Perez-Gonzalez 20251da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 20261da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 20271da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 20281da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 20291da177e4SLinus Torvalds #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) 20301da177e4SLinus Torvalds 20311da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 20321da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 20331da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 20341da177e4SLinus Torvalds #define HUB_RESET_TIMEOUT 500 20351da177e4SLinus Torvalds 20361da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 20371da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 20381da177e4SLinus Torvalds { 20391da177e4SLinus Torvalds int delay_time, ret; 20401da177e4SLinus Torvalds u16 portstatus; 20411da177e4SLinus Torvalds u16 portchange; 20421da177e4SLinus Torvalds 20431da177e4SLinus Torvalds for (delay_time = 0; 20441da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 20451da177e4SLinus Torvalds delay_time += delay) { 20461da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 20471da177e4SLinus Torvalds msleep(delay); 20481da177e4SLinus Torvalds 20491da177e4SLinus Torvalds /* read and decode port status */ 20501da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 20511da177e4SLinus Torvalds if (ret < 0) 20521da177e4SLinus Torvalds return ret; 20531da177e4SLinus Torvalds 20541da177e4SLinus Torvalds /* Device went away? */ 20551da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 20561da177e4SLinus Torvalds return -ENOTCONN; 20571da177e4SLinus Torvalds 2058dd4dd19eSAlan Stern /* bomb out completely if the connection bounced */ 20591da177e4SLinus Torvalds if ((portchange & USB_PORT_STAT_C_CONNECTION)) 2060dd4dd19eSAlan Stern return -ENOTCONN; 20611da177e4SLinus Torvalds 20621da177e4SLinus Torvalds /* if we`ve finished resetting, then break out of the loop */ 20631da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_RESET) && 20641da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_ENABLE)) { 20650165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 2066551cdbbeSGreg Kroah-Hartman udev->speed = USB_SPEED_WIRELESS; 2067131dec34SSarah Sharp else if (hub_is_superspeed(hub->hdev)) 2068809cd1cbSSarah Sharp udev->speed = USB_SPEED_SUPER; 20690165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 20701da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 20711da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 20721da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 20731da177e4SLinus Torvalds else 20741da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 20751da177e4SLinus Torvalds return 0; 20761da177e4SLinus Torvalds } 20771da177e4SLinus Torvalds 20781da177e4SLinus Torvalds /* switch to the long delay after two short delay failures */ 20791da177e4SLinus Torvalds if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 20801da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 20811da177e4SLinus Torvalds 20821da177e4SLinus Torvalds dev_dbg (hub->intfdev, 20831da177e4SLinus Torvalds "port %d not reset yet, waiting %dms\n", 20841da177e4SLinus Torvalds port1, delay); 20851da177e4SLinus Torvalds } 20861da177e4SLinus Torvalds 20871da177e4SLinus Torvalds return -EBUSY; 20881da177e4SLinus Torvalds } 20891da177e4SLinus Torvalds 20901da177e4SLinus Torvalds static int hub_port_reset(struct usb_hub *hub, int port1, 20911da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 20921da177e4SLinus Torvalds { 20931da177e4SLinus Torvalds int i, status; 2094a5f0efabSSarah Sharp struct usb_hcd *hcd; 20951da177e4SLinus Torvalds 2096a5f0efabSSarah Sharp hcd = bus_to_hcd(udev->bus); 209732fe0198SAlan Stern /* Block EHCI CF initialization during the port reset. 209832fe0198SAlan Stern * Some companion controllers don't like it when they mix. 209932fe0198SAlan Stern */ 210032fe0198SAlan Stern down_read(&ehci_cf_port_reset_rwsem); 210132fe0198SAlan Stern 21021da177e4SLinus Torvalds /* Reset the port */ 21031da177e4SLinus Torvalds for (i = 0; i < PORT_RESET_TRIES; i++) { 21041da177e4SLinus Torvalds status = set_port_feature(hub->hdev, 21051da177e4SLinus Torvalds port1, USB_PORT_FEAT_RESET); 21061da177e4SLinus Torvalds if (status) 21071da177e4SLinus Torvalds dev_err(hub->intfdev, 21081da177e4SLinus Torvalds "cannot reset port %d (err = %d)\n", 21091da177e4SLinus Torvalds port1, status); 21101da177e4SLinus Torvalds else { 21111da177e4SLinus Torvalds status = hub_port_wait_reset(hub, port1, udev, delay); 2112dd16525bSDavid Brownell if (status && status != -ENOTCONN) 21131da177e4SLinus Torvalds dev_dbg(hub->intfdev, 21141da177e4SLinus Torvalds "port_wait_reset: err = %d\n", 21151da177e4SLinus Torvalds status); 21161da177e4SLinus Torvalds } 21171da177e4SLinus Torvalds 21181da177e4SLinus Torvalds /* return on disconnect or reset */ 21191da177e4SLinus Torvalds switch (status) { 21201da177e4SLinus Torvalds case 0: 2121b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 2122b789696aSDavid Brownell msleep(10 + 40); 21233b29b68bSAlan Stern update_devnum(udev, 0); 2124a5f0efabSSarah Sharp if (hcd->driver->reset_device) { 2125a5f0efabSSarah Sharp status = hcd->driver->reset_device(hcd, udev); 2126a5f0efabSSarah Sharp if (status < 0) { 2127a5f0efabSSarah Sharp dev_err(&udev->dev, "Cannot reset " 2128a5f0efabSSarah Sharp "HCD device state\n"); 2129a5f0efabSSarah Sharp break; 2130a5f0efabSSarah Sharp } 2131a5f0efabSSarah Sharp } 21321da177e4SLinus Torvalds /* FALL THROUGH */ 21331da177e4SLinus Torvalds case -ENOTCONN: 21341da177e4SLinus Torvalds case -ENODEV: 21351da177e4SLinus Torvalds clear_port_feature(hub->hdev, 21361da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 21371da177e4SLinus Torvalds /* FIXME need disconnect() for NOTATTACHED device */ 21381da177e4SLinus Torvalds usb_set_device_state(udev, status 21391da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 21401da177e4SLinus Torvalds : USB_STATE_DEFAULT); 214132fe0198SAlan Stern goto done; 21421da177e4SLinus Torvalds } 21431da177e4SLinus Torvalds 21441da177e4SLinus Torvalds dev_dbg (hub->intfdev, 21451da177e4SLinus Torvalds "port %d not enabled, trying reset again...\n", 21461da177e4SLinus Torvalds port1); 21471da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 21481da177e4SLinus Torvalds } 21491da177e4SLinus Torvalds 21501da177e4SLinus Torvalds dev_err (hub->intfdev, 21511da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 21521da177e4SLinus Torvalds port1); 21531da177e4SLinus Torvalds 215432fe0198SAlan Stern done: 215532fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 21561da177e4SLinus Torvalds return status; 21571da177e4SLinus Torvalds } 21581da177e4SLinus Torvalds 21595e467f6eSAndiry Xu /* Warm reset a USB3 protocol port */ 21605e467f6eSAndiry Xu static int hub_port_warm_reset(struct usb_hub *hub, int port) 21615e467f6eSAndiry Xu { 21625e467f6eSAndiry Xu int ret; 21635e467f6eSAndiry Xu u16 portstatus, portchange; 21645e467f6eSAndiry Xu 21655e467f6eSAndiry Xu if (!hub_is_superspeed(hub->hdev)) { 21665e467f6eSAndiry Xu dev_err(hub->intfdev, "only USB3 hub support warm reset\n"); 21675e467f6eSAndiry Xu return -EINVAL; 21685e467f6eSAndiry Xu } 21695e467f6eSAndiry Xu 21705e467f6eSAndiry Xu /* Warm reset the port */ 21715e467f6eSAndiry Xu ret = set_port_feature(hub->hdev, 21725e467f6eSAndiry Xu port, USB_PORT_FEAT_BH_PORT_RESET); 21735e467f6eSAndiry Xu if (ret) { 21745e467f6eSAndiry Xu dev_err(hub->intfdev, "cannot warm reset port %d\n", port); 21755e467f6eSAndiry Xu return ret; 21765e467f6eSAndiry Xu } 21775e467f6eSAndiry Xu 21785e467f6eSAndiry Xu msleep(20); 21795e467f6eSAndiry Xu ret = hub_port_status(hub, port, &portstatus, &portchange); 21805e467f6eSAndiry Xu 21815e467f6eSAndiry Xu if (portchange & USB_PORT_STAT_C_RESET) 21825e467f6eSAndiry Xu clear_port_feature(hub->hdev, port, USB_PORT_FEAT_C_RESET); 21835e467f6eSAndiry Xu 21845e467f6eSAndiry Xu if (portchange & USB_PORT_STAT_C_BH_RESET) 21855e467f6eSAndiry Xu clear_port_feature(hub->hdev, port, 21865e467f6eSAndiry Xu USB_PORT_FEAT_C_BH_PORT_RESET); 21875e467f6eSAndiry Xu 21885e467f6eSAndiry Xu if (portchange & USB_PORT_STAT_C_LINK_STATE) 21895e467f6eSAndiry Xu clear_port_feature(hub->hdev, port, 21905e467f6eSAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 21915e467f6eSAndiry Xu 21925e467f6eSAndiry Xu return ret; 21935e467f6eSAndiry Xu } 21945e467f6eSAndiry Xu 21950ed9a57eSAndiry Xu /* Check if a port is power on */ 21960ed9a57eSAndiry Xu static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) 21970ed9a57eSAndiry Xu { 21980ed9a57eSAndiry Xu int ret = 0; 21990ed9a57eSAndiry Xu 22000ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 22010ed9a57eSAndiry Xu if (portstatus & USB_SS_PORT_STAT_POWER) 22020ed9a57eSAndiry Xu ret = 1; 22030ed9a57eSAndiry Xu } else { 22040ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_POWER) 22050ed9a57eSAndiry Xu ret = 1; 22060ed9a57eSAndiry Xu } 22070ed9a57eSAndiry Xu 22080ed9a57eSAndiry Xu return ret; 22090ed9a57eSAndiry Xu } 22100ed9a57eSAndiry Xu 2211d388dab7SAlan Stern #ifdef CONFIG_PM 22121da177e4SLinus Torvalds 22130ed9a57eSAndiry Xu /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ 22140ed9a57eSAndiry Xu static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) 22150ed9a57eSAndiry Xu { 22160ed9a57eSAndiry Xu int ret = 0; 22170ed9a57eSAndiry Xu 22180ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 22190ed9a57eSAndiry Xu if ((portstatus & USB_PORT_STAT_LINK_STATE) 22200ed9a57eSAndiry Xu == USB_SS_PORT_LS_U3) 22210ed9a57eSAndiry Xu ret = 1; 22220ed9a57eSAndiry Xu } else { 22230ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_SUSPEND) 22240ed9a57eSAndiry Xu ret = 1; 22250ed9a57eSAndiry Xu } 22260ed9a57eSAndiry Xu 22270ed9a57eSAndiry Xu return ret; 22280ed9a57eSAndiry Xu } 2229b01b03f3SAlan Stern 2230b01b03f3SAlan Stern /* Determine whether the device on a port is ready for a normal resume, 2231b01b03f3SAlan Stern * is ready for a reset-resume, or should be disconnected. 2232b01b03f3SAlan Stern */ 2233b01b03f3SAlan Stern static int check_port_resume_type(struct usb_device *udev, 2234b01b03f3SAlan Stern struct usb_hub *hub, int port1, 2235b01b03f3SAlan Stern int status, unsigned portchange, unsigned portstatus) 2236b01b03f3SAlan Stern { 2237b01b03f3SAlan Stern /* Is the device still present? */ 22380ed9a57eSAndiry Xu if (status || port_is_suspended(hub, portstatus) || 22390ed9a57eSAndiry Xu !port_is_power_on(hub, portstatus) || 22400ed9a57eSAndiry Xu !(portstatus & USB_PORT_STAT_CONNECTION)) { 2241b01b03f3SAlan Stern if (status >= 0) 2242b01b03f3SAlan Stern status = -ENODEV; 2243b01b03f3SAlan Stern } 2244b01b03f3SAlan Stern 224586c57edfSAlan Stern /* Can't do a normal resume if the port isn't enabled, 224686c57edfSAlan Stern * so try a reset-resume instead. 224786c57edfSAlan Stern */ 224886c57edfSAlan Stern else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { 224986c57edfSAlan Stern if (udev->persist_enabled) 225086c57edfSAlan Stern udev->reset_resume = 1; 225186c57edfSAlan Stern else 2252b01b03f3SAlan Stern status = -ENODEV; 225386c57edfSAlan Stern } 2254b01b03f3SAlan Stern 2255b01b03f3SAlan Stern if (status) { 2256b01b03f3SAlan Stern dev_dbg(hub->intfdev, 2257b01b03f3SAlan Stern "port %d status %04x.%04x after resume, %d\n", 2258b01b03f3SAlan Stern port1, portchange, portstatus, status); 2259b01b03f3SAlan Stern } else if (udev->reset_resume) { 2260b01b03f3SAlan Stern 2261b01b03f3SAlan Stern /* Late port handoff can set status-change bits */ 2262b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) 2263b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2264b01b03f3SAlan Stern USB_PORT_FEAT_C_CONNECTION); 2265b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) 2266b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2267b01b03f3SAlan Stern USB_PORT_FEAT_C_ENABLE); 2268b01b03f3SAlan Stern } 2269b01b03f3SAlan Stern 2270b01b03f3SAlan Stern return status; 2271b01b03f3SAlan Stern } 2272b01b03f3SAlan Stern 22731da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 22741da177e4SLinus Torvalds 22751da177e4SLinus Torvalds /* 2276140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 2277624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 22785edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 22791da177e4SLinus Torvalds * 22801da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 22811da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 22821da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 2283140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 22841da177e4SLinus Torvalds * to disconnect devices while they are suspended. 22851da177e4SLinus Torvalds * 2286390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 2287390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 2288390a8c34SDavid Brownell * 2289624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 2290624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 2291624d6c07SAlan Stern * All devices below the suspended port are also suspended. 2292624d6c07SAlan Stern * 2293624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 2294624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 2295624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 2296624d6c07SAlan Stern * some cases, this wakes the USB host. 2297624d6c07SAlan Stern * 22981da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 22991da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 23001da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 23011da177e4SLinus Torvalds * 23024956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 23034956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 23044956eccdSAlan Stern * State transitions include: 23054956eccdSAlan Stern * 23064956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 23074956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 23084956eccdSAlan Stern * 23094956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 23104956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 23114956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 23124956eccdSAlan Stern * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 23134956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 23144956eccdSAlan Stern * 23154956eccdSAlan Stern * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when 23164956eccdSAlan Stern * the root hub for their bus goes into global suspend ... so we don't 23174956eccdSAlan Stern * (falsely) update the device power state to say it suspended. 23184956eccdSAlan Stern * 23191da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 23201da177e4SLinus Torvalds */ 232165bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 23221da177e4SLinus Torvalds { 2323624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2324624d6c07SAlan Stern int port1 = udev->portnum; 2325624d6c07SAlan Stern int status; 23264956eccdSAlan Stern 2327624d6c07SAlan Stern // dev_dbg(hub->intfdev, "suspend port %d\n", port1); 2328624d6c07SAlan Stern 2329624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 2330624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 2331624d6c07SAlan Stern * 2332624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 2333624d6c07SAlan Stern * we don't explicitly enable it here. 2334624d6c07SAlan Stern */ 2335624d6c07SAlan Stern if (udev->do_remote_wakeup) { 2336624d6c07SAlan Stern status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2337624d6c07SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 2338624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 2339624d6c07SAlan Stern NULL, 0, 2340624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 23410c487206SOliver Neukum if (status) { 2342624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 2343624d6c07SAlan Stern status); 23440c487206SOliver Neukum /* bail if autosuspend is requested */ 23450c487206SOliver Neukum if (msg.event & PM_EVENT_AUTO) 23460c487206SOliver Neukum return status; 23470c487206SOliver Neukum } 2348624d6c07SAlan Stern } 2349624d6c07SAlan Stern 2350624d6c07SAlan Stern /* see 7.1.7.6 */ 2351a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 2352a7114230SAndiry Xu status = set_port_feature(hub->hdev, 2353a7114230SAndiry Xu port1 | (USB_SS_PORT_LS_U3 << 3), 2354a7114230SAndiry Xu USB_PORT_FEAT_LINK_STATE); 2355a8f08d86SAndiry Xu else 2356a8f08d86SAndiry Xu status = set_port_feature(hub->hdev, port1, 2357a8f08d86SAndiry Xu USB_PORT_FEAT_SUSPEND); 2358624d6c07SAlan Stern if (status) { 2359624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", 2360624d6c07SAlan Stern port1, status); 2361624d6c07SAlan Stern /* paranoia: "should not happen" */ 23620c487206SOliver Neukum if (udev->do_remote_wakeup) 2363624d6c07SAlan Stern (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2364624d6c07SAlan Stern USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 2365624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 2366624d6c07SAlan Stern NULL, 0, 2367624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 2368624d6c07SAlan Stern } else { 2369624d6c07SAlan Stern /* device has up to 10 msec to fully suspend */ 2370624d6c07SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend\n", 237165bfd296SAlan Stern (msg.event & PM_EVENT_AUTO ? "auto-" : "")); 2372624d6c07SAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 2373624d6c07SAlan Stern msleep(10); 2374624d6c07SAlan Stern } 2375c08512c7SAlan Stern usb_mark_last_busy(hub->hdev); 23764956eccdSAlan Stern return status; 23771da177e4SLinus Torvalds } 2378f3f3253dSDavid Brownell 23791da177e4SLinus Torvalds /* 2380390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 2381390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 238254515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 23831da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 23841da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 23851da177e4SLinus Torvalds * in the tree that's rooted at this device. 238654515fe5SAlan Stern * 238754515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 238854515fe5SAlan Stern * status check is done. 23891da177e4SLinus Torvalds */ 2390140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 23911da177e4SLinus Torvalds { 239254515fe5SAlan Stern int status = 0; 23931da177e4SLinus Torvalds u16 devstatus; 23941da177e4SLinus Torvalds 23951da177e4SLinus Torvalds /* caller owns the udev device lock */ 2396b9cef6c3SWu Fengguang dev_dbg(&udev->dev, "%s\n", 2397b9cef6c3SWu Fengguang udev->reset_resume ? "finish reset-resume" : "finish resume"); 23981da177e4SLinus Torvalds 23991da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 24001da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 24011da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 24021da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 24031da177e4SLinus Torvalds */ 24041da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 24051da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 24061da177e4SLinus Torvalds : USB_STATE_ADDRESS); 24071da177e4SLinus Torvalds 240854515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 240954515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 241054515fe5SAlan Stern * operation is carried out here, after the port has been 241154515fe5SAlan Stern * resumed. 241254515fe5SAlan Stern */ 241354515fe5SAlan Stern if (udev->reset_resume) 241486c57edfSAlan Stern retry_reset_resume: 2415742120c6SMing Lei status = usb_reset_and_verify_device(udev); 241654515fe5SAlan Stern 24171da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 24181da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 24191da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 24201da177e4SLinus Torvalds */ 242154515fe5SAlan Stern if (status == 0) { 242246dede46SAlan Stern devstatus = 0; 24231da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 2424b40b7a90SAlan Stern if (status >= 0) 242546dede46SAlan Stern status = (status > 0 ? 0 : -ENODEV); 242686c57edfSAlan Stern 242786c57edfSAlan Stern /* If a normal resume failed, try doing a reset-resume */ 242886c57edfSAlan Stern if (status && !udev->reset_resume && udev->persist_enabled) { 242986c57edfSAlan Stern dev_dbg(&udev->dev, "retry with reset-resume\n"); 243086c57edfSAlan Stern udev->reset_resume = 1; 243186c57edfSAlan Stern goto retry_reset_resume; 243286c57edfSAlan Stern } 243354515fe5SAlan Stern } 2434b40b7a90SAlan Stern 2435624d6c07SAlan Stern if (status) { 2436624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 24371da177e4SLinus Torvalds status); 2438624d6c07SAlan Stern } else if (udev->actconfig) { 24391da177e4SLinus Torvalds le16_to_cpus(&devstatus); 2440686314cfSAlan Stern if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { 24411da177e4SLinus Torvalds status = usb_control_msg(udev, 24421da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 24431da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, 24441da177e4SLinus Torvalds USB_RECIP_DEVICE, 24451da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 24461da177e4SLinus Torvalds NULL, 0, 24471da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 2448a8e7c565SAlan Stern if (status) 2449b9cef6c3SWu Fengguang dev_dbg(&udev->dev, 2450b9cef6c3SWu Fengguang "disable remote wakeup, status %d\n", 2451b9cef6c3SWu Fengguang status); 24524bf0ba86SAlan Stern } 24531da177e4SLinus Torvalds status = 0; 24541da177e4SLinus Torvalds } 24551da177e4SLinus Torvalds return status; 24561da177e4SLinus Torvalds } 24571da177e4SLinus Torvalds 2458624d6c07SAlan Stern /* 2459624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 2460624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 2461624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 2462624d6c07SAlan Stern * 2463624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 2464624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 2465624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 2466624d6c07SAlan Stern * the host and the device is the same as it was when the device 2467624d6c07SAlan Stern * suspended. 2468624d6c07SAlan Stern * 2469feccc30dSAlan Stern * If @udev->reset_resume is set then this routine won't check that the 2470feccc30dSAlan Stern * port is still enabled. Furthermore, finish_port_resume() above will 247154515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 247254515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 247354515fe5SAlan Stern * 247454515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 247554515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 247654515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 247754515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 247854515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 247954515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 248054515fe5SAlan Stern * made to appear as if it had not disconnected. 248154515fe5SAlan Stern * 2482742120c6SMing Lei * This facility can be dangerous. Although usb_reset_and_verify_device() makes 2483feccc30dSAlan Stern * every effort to insure that the same device is present after the 248454515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 248554515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 248654515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 248754515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 248854515fe5SAlan Stern * new card is corrupted and the system crashes. 248954515fe5SAlan Stern * 2490624d6c07SAlan Stern * Returns 0 on success, else negative errno. 2491624d6c07SAlan Stern */ 249265bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 24931da177e4SLinus Torvalds { 2494624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2495624d6c07SAlan Stern int port1 = udev->portnum; 24961da177e4SLinus Torvalds int status; 2497d25450c6SAlan Stern u16 portchange, portstatus; 2498d25450c6SAlan Stern 2499d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 2500d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 25010ed9a57eSAndiry Xu if (status == 0 && !port_is_suspended(hub, portstatus)) 2502d25450c6SAlan Stern goto SuspendCleared; 25031da177e4SLinus Torvalds 25041da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "resume port %d\n", port1); 25051da177e4SLinus Torvalds 2506d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 2507d5cbad4bSAlan Stern 25081da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 2509a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 2510a7114230SAndiry Xu status = set_port_feature(hub->hdev, 2511a7114230SAndiry Xu port1 | (USB_SS_PORT_LS_U0 << 3), 2512a7114230SAndiry Xu USB_PORT_FEAT_LINK_STATE); 2513a7114230SAndiry Xu else 25141da177e4SLinus Torvalds status = clear_port_feature(hub->hdev, 25151da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 25161da177e4SLinus Torvalds if (status) { 2517624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", 25181da177e4SLinus Torvalds port1, status); 25191da177e4SLinus Torvalds } else { 25201da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 2521645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 252265bfd296SAlan Stern (msg.event & PM_EVENT_AUTO ? "auto-" : "")); 25231da177e4SLinus Torvalds msleep(25); 25241da177e4SLinus Torvalds 25251da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 25261da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 25271da177e4SLinus Torvalds * sequence. 25281da177e4SLinus Torvalds */ 2529d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 253054515fe5SAlan Stern 25311da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 25321da177e4SLinus Torvalds msleep(10); 25331da177e4SLinus Torvalds } 2534b01b03f3SAlan Stern 2535b01b03f3SAlan Stern SuspendCleared: 2536b01b03f3SAlan Stern if (status == 0) { 2537a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) { 2538a7114230SAndiry Xu if (portchange & USB_PORT_STAT_C_LINK_STATE) 2539a7114230SAndiry Xu clear_port_feature(hub->hdev, port1, 2540a7114230SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 2541a7114230SAndiry Xu } else { 2542b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 2543b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2544b01b03f3SAlan Stern USB_PORT_FEAT_C_SUSPEND); 25451da177e4SLinus Torvalds } 2546a7114230SAndiry Xu } 25471da177e4SLinus Torvalds 2548d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 2549d5cbad4bSAlan Stern 2550b01b03f3SAlan Stern status = check_port_resume_type(udev, 2551b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 255254515fe5SAlan Stern if (status == 0) 255354515fe5SAlan Stern status = finish_port_resume(udev); 255454515fe5SAlan Stern if (status < 0) { 255554515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 255654515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 255754515fe5SAlan Stern } 25581da177e4SLinus Torvalds return status; 25591da177e4SLinus Torvalds } 25601da177e4SLinus Torvalds 25618808f00cSAlan Stern /* caller has locked udev */ 25620534d468SAlan Stern int usb_remote_wakeup(struct usb_device *udev) 25631da177e4SLinus Torvalds { 25641da177e4SLinus Torvalds int status = 0; 25651da177e4SLinus Torvalds 25661da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 2567645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 25689bbdf1e0SAlan Stern status = usb_autoresume_device(udev); 25699bbdf1e0SAlan Stern if (status == 0) { 25709bbdf1e0SAlan Stern /* Let the drivers do their thing, then... */ 25719bbdf1e0SAlan Stern usb_autosuspend_device(udev); 25729bbdf1e0SAlan Stern } 2573d25450c6SAlan Stern } 25741da177e4SLinus Torvalds return status; 25751da177e4SLinus Torvalds } 25761da177e4SLinus Torvalds 2577d388dab7SAlan Stern #else /* CONFIG_USB_SUSPEND */ 2578d388dab7SAlan Stern 2579d388dab7SAlan Stern /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ 2580d388dab7SAlan Stern 258165bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 2582d388dab7SAlan Stern { 2583d388dab7SAlan Stern return 0; 2584d388dab7SAlan Stern } 2585d388dab7SAlan Stern 2586b01b03f3SAlan Stern /* However we may need to do a reset-resume */ 2587b01b03f3SAlan Stern 258865bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 2589d388dab7SAlan Stern { 2590b01b03f3SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2591b01b03f3SAlan Stern int port1 = udev->portnum; 2592b01b03f3SAlan Stern int status; 2593b01b03f3SAlan Stern u16 portchange, portstatus; 259454515fe5SAlan Stern 2595b01b03f3SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 2596b01b03f3SAlan Stern status = check_port_resume_type(udev, 2597b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 2598b01b03f3SAlan Stern 2599b01b03f3SAlan Stern if (status) { 2600b01b03f3SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 2601b01b03f3SAlan Stern hub_port_logical_disconnect(hub, port1); 2602b01b03f3SAlan Stern } else if (udev->reset_resume) { 260354515fe5SAlan Stern dev_dbg(&udev->dev, "reset-resume\n"); 2604742120c6SMing Lei status = usb_reset_and_verify_device(udev); 260554515fe5SAlan Stern } 260654515fe5SAlan Stern return status; 2607d388dab7SAlan Stern } 2608d388dab7SAlan Stern 2609d388dab7SAlan Stern #endif 2610d388dab7SAlan Stern 2611db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 26121da177e4SLinus Torvalds { 26131da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 26141da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 26151da177e4SLinus Torvalds unsigned port1; 26161da177e4SLinus Torvalds 2617c9f89fa4SDavid Brownell /* fail if children aren't already suspended */ 26181da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 26191da177e4SLinus Torvalds struct usb_device *udev; 26201da177e4SLinus Torvalds 26211da177e4SLinus Torvalds udev = hdev->children [port1-1]; 26226840d255SAlan Stern if (udev && udev->can_submit) { 262365bfd296SAlan Stern if (!(msg.event & PM_EVENT_AUTO)) 2624645daaabSAlan Stern dev_dbg(&intf->dev, "port %d nyet suspended\n", 2625645daaabSAlan Stern port1); 2626c9f89fa4SDavid Brownell return -EBUSY; 2627c9f89fa4SDavid Brownell } 26281da177e4SLinus Torvalds } 26291da177e4SLinus Torvalds 2630441b62c1SHarvey Harrison dev_dbg(&intf->dev, "%s\n", __func__); 263140f122f3SAlan Stern 2632c9f89fa4SDavid Brownell /* stop khubd and related activity */ 26334330354fSAlan Stern hub_quiesce(hub, HUB_SUSPEND); 2634b6f6436dSAlan Stern return 0; 26351da177e4SLinus Torvalds } 26361da177e4SLinus Torvalds 26371da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 26381da177e4SLinus Torvalds { 26391da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 26401da177e4SLinus Torvalds 26415e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 2642f2835219SAlan Stern hub_activate(hub, HUB_RESUME); 26431da177e4SLinus Torvalds return 0; 26441da177e4SLinus Torvalds } 26451da177e4SLinus Torvalds 2646b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 2647f07600cfSAlan Stern { 2648b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 2649f07600cfSAlan Stern 26505e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 2651f2835219SAlan Stern hub_activate(hub, HUB_RESET_RESUME); 2652f07600cfSAlan Stern return 0; 2653f07600cfSAlan Stern } 2654f07600cfSAlan Stern 265554515fe5SAlan Stern /** 265654515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 265754515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 265854515fe5SAlan Stern * 265954515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 266054515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 2661feccc30dSAlan Stern * has been reset. The routine marks @rhdev as having lost power. 2662feccc30dSAlan Stern * When the hub driver is resumed it will take notice and carry out 2663feccc30dSAlan Stern * power-session recovery for all the "USB-PERSIST"-enabled child devices; 2664feccc30dSAlan Stern * the others will be disconnected. 266554515fe5SAlan Stern */ 266654515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 266754515fe5SAlan Stern { 266854515fe5SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 266954515fe5SAlan Stern rhdev->reset_resume = 1; 267054515fe5SAlan Stern } 267154515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 267254515fe5SAlan Stern 2673d388dab7SAlan Stern #else /* CONFIG_PM */ 2674d388dab7SAlan Stern 2675511366daSAndrew Morton #define hub_suspend NULL 2676511366daSAndrew Morton #define hub_resume NULL 2677f07600cfSAlan Stern #define hub_reset_resume NULL 2678d388dab7SAlan Stern #endif 2679d388dab7SAlan Stern 26801da177e4SLinus Torvalds 26811da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 26821da177e4SLinus Torvalds * 26831da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 26841da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 26851da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 26861da177e4SLinus Torvalds * 26871da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 26881da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 26891da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 26901da177e4SLinus Torvalds * 26911da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 26921da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 26931da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 26941da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 26951da177e4SLinus Torvalds */ 26961da177e4SLinus Torvalds static int hub_port_debounce(struct usb_hub *hub, int port1) 26971da177e4SLinus Torvalds { 26981da177e4SLinus Torvalds int ret; 26991da177e4SLinus Torvalds int total_time, stable_time = 0; 27001da177e4SLinus Torvalds u16 portchange, portstatus; 27011da177e4SLinus Torvalds unsigned connection = 0xffff; 27021da177e4SLinus Torvalds 27031da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 27041da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 27051da177e4SLinus Torvalds if (ret < 0) 27061da177e4SLinus Torvalds return ret; 27071da177e4SLinus Torvalds 27081da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 27091da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 27101da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 27111da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 27121da177e4SLinus Torvalds break; 27131da177e4SLinus Torvalds } else { 27141da177e4SLinus Torvalds stable_time = 0; 27151da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 27161da177e4SLinus Torvalds } 27171da177e4SLinus Torvalds 27181da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 27191da177e4SLinus Torvalds clear_port_feature(hub->hdev, port1, 27201da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 27211da177e4SLinus Torvalds } 27221da177e4SLinus Torvalds 27231da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 27241da177e4SLinus Torvalds break; 27251da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 27261da177e4SLinus Torvalds } 27271da177e4SLinus Torvalds 27281da177e4SLinus Torvalds dev_dbg (hub->intfdev, 27291da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 27301da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 27311da177e4SLinus Torvalds 27321da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 27331da177e4SLinus Torvalds return -ETIMEDOUT; 27341da177e4SLinus Torvalds return portstatus; 27351da177e4SLinus Torvalds } 27361da177e4SLinus Torvalds 2737fc721f51SInaky Perez-Gonzalez void usb_ep0_reinit(struct usb_device *udev) 27381da177e4SLinus Torvalds { 2739ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); 2740ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); 27412caf7fcdSAlan Stern usb_enable_endpoint(udev, &udev->ep0, true); 27421da177e4SLinus Torvalds } 2743fc721f51SInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_ep0_reinit); 27441da177e4SLinus Torvalds 27451da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 27461da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 27471da177e4SLinus Torvalds 27484326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 27491da177e4SLinus Torvalds { 27501da177e4SLinus Torvalds int retval; 2751c6515272SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 27521da177e4SLinus Torvalds 2753c6515272SSarah Sharp /* 2754c6515272SSarah Sharp * The host controller will choose the device address, 2755c6515272SSarah Sharp * instead of the core having chosen it earlier 2756c6515272SSarah Sharp */ 2757c6515272SSarah Sharp if (!hcd->driver->address_device && devnum <= 1) 27581da177e4SLinus Torvalds return -EINVAL; 27591da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 27601da177e4SLinus Torvalds return 0; 27611da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 27621da177e4SLinus Torvalds return -EINVAL; 2763c8d4af8eSAndiry Xu if (hcd->driver->address_device) 2764c6515272SSarah Sharp retval = hcd->driver->address_device(hcd, udev); 2765c8d4af8eSAndiry Xu else 27661da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 27674326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 27681da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 27691da177e4SLinus Torvalds if (retval == 0) { 27703b29b68bSAlan Stern update_devnum(udev, devnum); 27714953d141SDavid Vrabel /* Device now using proper address. */ 27721da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 2773fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 27741da177e4SLinus Torvalds } 27751da177e4SLinus Torvalds return retval; 27761da177e4SLinus Torvalds } 27771da177e4SLinus Torvalds 27781da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 27791da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 27801da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 27811da177e4SLinus Torvalds * 27821da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 2783742120c6SMing Lei * usb_reset_and_verify_device), the caller must own the device lock. For a 27841da177e4SLinus Torvalds * newly detected device that is not accessible through any global 27851da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 27861da177e4SLinus Torvalds */ 27871da177e4SLinus Torvalds static int 27881da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 27891da177e4SLinus Torvalds int retry_counter) 27901da177e4SLinus Torvalds { 27914186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 27921da177e4SLinus Torvalds 27931da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 2794e7b77172SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 27951da177e4SLinus Torvalds int i, j, retval; 27961da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 27971da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 279883a07196SInaky Perez-Gonzalez char *speed, *type; 27994326ed0bSAlan Stern int devnum = udev->devnum; 28001da177e4SLinus Torvalds 28011da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 28021da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 28031da177e4SLinus Torvalds */ 28041da177e4SLinus Torvalds if (!hdev->parent) { 28051da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 28061da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 28071da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 28081da177e4SLinus Torvalds } 28091da177e4SLinus Torvalds 28101da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 28111da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 28121da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 28131da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 28141da177e4SLinus Torvalds 28154186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 28161da177e4SLinus Torvalds 28171da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 2818e7b77172SSarah Sharp /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ 28191da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 28201da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 28211da177e4SLinus Torvalds goto fail; 28221da177e4SLinus Torvalds /* success, speed is known */ 282307194ab7SLuben Tuikov 28241da177e4SLinus Torvalds retval = -ENODEV; 28251da177e4SLinus Torvalds 28261da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 28271da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 28281da177e4SLinus Torvalds goto fail; 28291da177e4SLinus Torvalds } 28301da177e4SLinus Torvalds oldspeed = udev->speed; 28311da177e4SLinus Torvalds 28321da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 28331da177e4SLinus Torvalds * it's fixed size except for full speed devices. 28345bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 28355bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 28361da177e4SLinus Torvalds */ 28371da177e4SLinus Torvalds switch (udev->speed) { 28386b403b02SSarah Sharp case USB_SPEED_SUPER: 2839551cdbbeSGreg Kroah-Hartman case USB_SPEED_WIRELESS: /* fixed at 512 */ 2840551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); 28415bb6e0aeSInaky Perez-Gonzalez break; 28421da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 2843551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 28441da177e4SLinus Torvalds break; 28451da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 28461da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 28471da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 28481da177e4SLinus Torvalds * then correct our initial guess. 28491da177e4SLinus Torvalds */ 2850551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 28511da177e4SLinus Torvalds break; 28521da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 2853551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); 28541da177e4SLinus Torvalds break; 28551da177e4SLinus Torvalds default: 28561da177e4SLinus Torvalds goto fail; 28571da177e4SLinus Torvalds } 28581da177e4SLinus Torvalds 285983a07196SInaky Perez-Gonzalez type = ""; 286083a07196SInaky Perez-Gonzalez switch (udev->speed) { 28611da177e4SLinus Torvalds case USB_SPEED_LOW: speed = "low"; break; 28621da177e4SLinus Torvalds case USB_SPEED_FULL: speed = "full"; break; 28631da177e4SLinus Torvalds case USB_SPEED_HIGH: speed = "high"; break; 28646b403b02SSarah Sharp case USB_SPEED_SUPER: 28656b403b02SSarah Sharp speed = "super"; 28666b403b02SSarah Sharp break; 2867551cdbbeSGreg Kroah-Hartman case USB_SPEED_WIRELESS: 286883a07196SInaky Perez-Gonzalez speed = "variable"; 286983a07196SInaky Perez-Gonzalez type = "Wireless "; 287083a07196SInaky Perez-Gonzalez break; 28711da177e4SLinus Torvalds default: speed = "?"; break; 287283a07196SInaky Perez-Gonzalez } 2873c6515272SSarah Sharp if (udev->speed != USB_SPEED_SUPER) 287483a07196SInaky Perez-Gonzalez dev_info(&udev->dev, 28753b29b68bSAlan Stern "%s %s speed %sUSB device number %d using %s\n", 287683a07196SInaky Perez-Gonzalez (udev->config) ? "reset" : "new", speed, type, 28773b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 28781da177e4SLinus Torvalds 28791da177e4SLinus Torvalds /* Set up TT records, if needed */ 28801da177e4SLinus Torvalds if (hdev->tt) { 28811da177e4SLinus Torvalds udev->tt = hdev->tt; 28821da177e4SLinus Torvalds udev->ttport = hdev->ttport; 28831da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 28841da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 2885d199c96dSAlan Stern if (!hub->tt.hub) { 2886d199c96dSAlan Stern dev_err(&udev->dev, "parent hub has no TT\n"); 2887d199c96dSAlan Stern retval = -EINVAL; 2888d199c96dSAlan Stern goto fail; 2889d199c96dSAlan Stern } 28901da177e4SLinus Torvalds udev->tt = &hub->tt; 28911da177e4SLinus Torvalds udev->ttport = port1; 28921da177e4SLinus Torvalds } 28931da177e4SLinus Torvalds 28941da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 28951da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 28961da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 28971da177e4SLinus Torvalds * Change it cautiously. 28981da177e4SLinus Torvalds * 28991da177e4SLinus Torvalds * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 29001da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 29011da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 29021da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 29031da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 29041da177e4SLinus Torvalds * value. 29051da177e4SLinus Torvalds */ 29061da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 2907c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) { 29081da177e4SLinus Torvalds struct usb_device_descriptor *buf; 29091da177e4SLinus Torvalds int r = 0; 29101da177e4SLinus Torvalds 29111da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 29121da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 29131da177e4SLinus Torvalds if (!buf) { 29141da177e4SLinus Torvalds retval = -ENOMEM; 29151da177e4SLinus Torvalds continue; 29161da177e4SLinus Torvalds } 29171da177e4SLinus Torvalds 2918b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 2919b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 2920b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 29211da177e4SLinus Torvalds */ 29221da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 29231da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 29241da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 29251da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 29261da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 29271da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 2928fd7c519dSJaroslav Kysela initial_descriptor_timeout); 29291da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 29305bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 29311da177e4SLinus Torvalds if (buf->bDescriptorType == 29321da177e4SLinus Torvalds USB_DT_DEVICE) { 29331da177e4SLinus Torvalds r = 0; 29341da177e4SLinus Torvalds break; 29351da177e4SLinus Torvalds } 29361da177e4SLinus Torvalds /* FALL THROUGH */ 29371da177e4SLinus Torvalds default: 29381da177e4SLinus Torvalds if (r == 0) 29391da177e4SLinus Torvalds r = -EPROTO; 29401da177e4SLinus Torvalds break; 29411da177e4SLinus Torvalds } 29421da177e4SLinus Torvalds if (r == 0) 29431da177e4SLinus Torvalds break; 29441da177e4SLinus Torvalds } 29451da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 29461da177e4SLinus Torvalds buf->bMaxPacketSize0; 29471da177e4SLinus Torvalds kfree(buf); 29481da177e4SLinus Torvalds 29491da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 29501da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 29511da177e4SLinus Torvalds goto fail; 29521da177e4SLinus Torvalds if (oldspeed != udev->speed) { 29531da177e4SLinus Torvalds dev_dbg(&udev->dev, 29541da177e4SLinus Torvalds "device reset changed speed!\n"); 29551da177e4SLinus Torvalds retval = -ENODEV; 29561da177e4SLinus Torvalds goto fail; 29571da177e4SLinus Torvalds } 29581da177e4SLinus Torvalds if (r) { 2959b9cef6c3SWu Fengguang dev_err(&udev->dev, 2960b9cef6c3SWu Fengguang "device descriptor read/64, error %d\n", 2961b9cef6c3SWu Fengguang r); 29621da177e4SLinus Torvalds retval = -EMSGSIZE; 29631da177e4SLinus Torvalds continue; 29641da177e4SLinus Torvalds } 29651da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 29661da177e4SLinus Torvalds } 29671da177e4SLinus Torvalds 29686c529cdcSInaky Perez-Gonzalez /* 29696c529cdcSInaky Perez-Gonzalez * If device is WUSB, we already assigned an 29706c529cdcSInaky Perez-Gonzalez * unauthorized address in the Connect Ack sequence; 29716c529cdcSInaky Perez-Gonzalez * authorization will assign the final address. 29726c529cdcSInaky Perez-Gonzalez */ 29736c529cdcSInaky Perez-Gonzalez if (udev->wusb == 0) { 29741da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 29754326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 29761da177e4SLinus Torvalds if (retval >= 0) 29771da177e4SLinus Torvalds break; 29781da177e4SLinus Torvalds msleep(200); 29791da177e4SLinus Torvalds } 29801da177e4SLinus Torvalds if (retval < 0) { 29811da177e4SLinus Torvalds dev_err(&udev->dev, 29821da177e4SLinus Torvalds "device not accepting address %d, error %d\n", 29834326ed0bSAlan Stern devnum, retval); 29841da177e4SLinus Torvalds goto fail; 29851da177e4SLinus Torvalds } 2986c6515272SSarah Sharp if (udev->speed == USB_SPEED_SUPER) { 2987c6515272SSarah Sharp devnum = udev->devnum; 2988c6515272SSarah Sharp dev_info(&udev->dev, 29893b29b68bSAlan Stern "%s SuperSpeed USB device number %d using %s\n", 2990c6515272SSarah Sharp (udev->config) ? "reset" : "new", 29913b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 2992c6515272SSarah Sharp } 29931da177e4SLinus Torvalds 29941da177e4SLinus Torvalds /* cope with hardware quirkiness: 29951da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 29961da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 29971da177e4SLinus Torvalds */ 29981da177e4SLinus Torvalds msleep(10); 2999c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) 30001da177e4SLinus Torvalds break; 30016c529cdcSInaky Perez-Gonzalez } 30021da177e4SLinus Torvalds 30031da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 30041da177e4SLinus Torvalds if (retval < 8) { 3005b9cef6c3SWu Fengguang dev_err(&udev->dev, 3006b9cef6c3SWu Fengguang "device descriptor read/8, error %d\n", 3007b9cef6c3SWu Fengguang retval); 30081da177e4SLinus Torvalds if (retval >= 0) 30091da177e4SLinus Torvalds retval = -EMSGSIZE; 30101da177e4SLinus Torvalds } else { 30111da177e4SLinus Torvalds retval = 0; 30121da177e4SLinus Torvalds break; 30131da177e4SLinus Torvalds } 30141da177e4SLinus Torvalds } 30151da177e4SLinus Torvalds if (retval) 30161da177e4SLinus Torvalds goto fail; 30171da177e4SLinus Torvalds 30186b403b02SSarah Sharp if (udev->descriptor.bMaxPacketSize0 == 0xff || 30196b403b02SSarah Sharp udev->speed == USB_SPEED_SUPER) 30206b403b02SSarah Sharp i = 512; 30216b403b02SSarah Sharp else 30226b403b02SSarah Sharp i = udev->descriptor.bMaxPacketSize0; 30231da177e4SLinus Torvalds if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { 302456626a72SAlan Stern if (udev->speed == USB_SPEED_LOW || 30251da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 302656626a72SAlan Stern dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); 30271da177e4SLinus Torvalds retval = -EMSGSIZE; 30281da177e4SLinus Torvalds goto fail; 30291da177e4SLinus Torvalds } 303056626a72SAlan Stern if (udev->speed == USB_SPEED_FULL) 30311da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 303256626a72SAlan Stern else 303356626a72SAlan Stern dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); 30341da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 3035fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 30361da177e4SLinus Torvalds } 30371da177e4SLinus Torvalds 30381da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 30391da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 3040b9cef6c3SWu Fengguang dev_err(&udev->dev, "device descriptor read/all, error %d\n", 3041b9cef6c3SWu Fengguang retval); 30421da177e4SLinus Torvalds if (retval >= 0) 30431da177e4SLinus Torvalds retval = -ENOMSG; 30441da177e4SLinus Torvalds goto fail; 30451da177e4SLinus Torvalds } 30461da177e4SLinus Torvalds 30471da177e4SLinus Torvalds retval = 0; 304848f24970SAlek Du /* notify HCD that we have a device connected and addressed */ 304948f24970SAlek Du if (hcd->driver->update_device) 305048f24970SAlek Du hcd->driver->update_device(hcd, udev); 30511da177e4SLinus Torvalds fail: 30524326ed0bSAlan Stern if (retval) { 30531da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 30543b29b68bSAlan Stern update_devnum(udev, devnum); /* for disconnect processing */ 30554326ed0bSAlan Stern } 30564186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 30571da177e4SLinus Torvalds return retval; 30581da177e4SLinus Torvalds } 30591da177e4SLinus Torvalds 30601da177e4SLinus Torvalds static void 30611da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 30621da177e4SLinus Torvalds { 30631da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 30641da177e4SLinus Torvalds int status; 30651da177e4SLinus Torvalds 3066e94b1766SChristoph Lameter qual = kmalloc (sizeof *qual, GFP_KERNEL); 30671da177e4SLinus Torvalds if (qual == NULL) 30681da177e4SLinus Torvalds return; 30691da177e4SLinus Torvalds 30701da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 30711da177e4SLinus Torvalds qual, sizeof *qual); 30721da177e4SLinus Torvalds if (status == sizeof *qual) { 30731da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 30741da177e4SLinus Torvalds "connect to a high speed hub\n"); 30751da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 30761da177e4SLinus Torvalds if (hub->has_indicators) { 30771da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 3078c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 30791da177e4SLinus Torvalds } 30801da177e4SLinus Torvalds } 30811da177e4SLinus Torvalds kfree(qual); 30821da177e4SLinus Torvalds } 30831da177e4SLinus Torvalds 30841da177e4SLinus Torvalds static unsigned 30851da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 30861da177e4SLinus Torvalds { 30871da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 30881da177e4SLinus Torvalds int remaining; 308955c52718SAlan Stern int port1; 30901da177e4SLinus Torvalds 309155c52718SAlan Stern if (!hub->limited_power) 30921da177e4SLinus Torvalds return 0; 30931da177e4SLinus Torvalds 309455c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 309555c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 309655c52718SAlan Stern struct usb_device *udev = hdev->children[port1 - 1]; 309755c52718SAlan Stern int delta; 30981da177e4SLinus Torvalds 30991da177e4SLinus Torvalds if (!udev) 31001da177e4SLinus Torvalds continue; 31011da177e4SLinus Torvalds 310255c52718SAlan Stern /* Unconfigured devices may not use more than 100mA, 310355c52718SAlan Stern * or 8mA for OTG ports */ 31041da177e4SLinus Torvalds if (udev->actconfig) 310555c52718SAlan Stern delta = udev->actconfig->desc.bMaxPower * 2; 310655c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 310755c52718SAlan Stern delta = 100; 31081da177e4SLinus Torvalds else 310955c52718SAlan Stern delta = 8; 311055c52718SAlan Stern if (delta > hub->mA_per_port) 3111b9cef6c3SWu Fengguang dev_warn(&udev->dev, 3112b9cef6c3SWu Fengguang "%dmA is over %umA budget for port %d!\n", 311355c52718SAlan Stern delta, hub->mA_per_port, port1); 31141da177e4SLinus Torvalds remaining -= delta; 31151da177e4SLinus Torvalds } 31161da177e4SLinus Torvalds if (remaining < 0) { 311755c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 311855c52718SAlan Stern - remaining); 31191da177e4SLinus Torvalds remaining = 0; 31201da177e4SLinus Torvalds } 31211da177e4SLinus Torvalds return remaining; 31221da177e4SLinus Torvalds } 31231da177e4SLinus Torvalds 31241da177e4SLinus Torvalds /* Handle physical or logical connection change events. 31251da177e4SLinus Torvalds * This routine is called when: 31261da177e4SLinus Torvalds * a port connection-change occurs; 31271da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 3128742120c6SMing Lei * usb_reset_and_verify_device() encounters changed descriptors (as from 31291da177e4SLinus Torvalds * a firmware download) 31301da177e4SLinus Torvalds * caller already locked the hub 31311da177e4SLinus Torvalds */ 31321da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 31331da177e4SLinus Torvalds u16 portstatus, u16 portchange) 31341da177e4SLinus Torvalds { 31351da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 31361da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 313790da096eSBalaji Rao struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 313824618b0cSAlan Stern unsigned wHubCharacteristics = 313924618b0cSAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 31408808f00cSAlan Stern struct usb_device *udev; 31411da177e4SLinus Torvalds int status, i; 31421da177e4SLinus Torvalds 31431da177e4SLinus Torvalds dev_dbg (hub_dev, 31441da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 3145131dec34SSarah Sharp port1, portstatus, portchange, portspeed(hub, portstatus)); 31461da177e4SLinus Torvalds 31471da177e4SLinus Torvalds if (hub->has_indicators) { 31481da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 31491da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 31501da177e4SLinus Torvalds } 31511da177e4SLinus Torvalds 31521da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 31531da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 31541da177e4SLinus Torvalds if (hdev->bus->is_b_host) 315524618b0cSAlan Stern portchange &= ~(USB_PORT_STAT_C_CONNECTION | 315624618b0cSAlan Stern USB_PORT_STAT_C_ENABLE); 31571da177e4SLinus Torvalds #endif 31581da177e4SLinus Torvalds 31598808f00cSAlan Stern /* Try to resuscitate an existing device */ 31608808f00cSAlan Stern udev = hdev->children[port1-1]; 31618808f00cSAlan Stern if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && 31628808f00cSAlan Stern udev->state != USB_STATE_NOTATTACHED) { 31638808f00cSAlan Stern usb_lock_device(udev); 31648808f00cSAlan Stern if (portstatus & USB_PORT_STAT_ENABLE) { 31658808f00cSAlan Stern status = 0; /* Nothing to do */ 31668808f00cSAlan Stern 31678808f00cSAlan Stern #ifdef CONFIG_USB_SUSPEND 31685257d97aSAlan Stern } else if (udev->state == USB_STATE_SUSPENDED && 31695257d97aSAlan Stern udev->persist_enabled) { 31708808f00cSAlan Stern /* For a suspended device, treat this as a 31718808f00cSAlan Stern * remote wakeup event. 31728808f00cSAlan Stern */ 31730534d468SAlan Stern status = usb_remote_wakeup(udev); 31748808f00cSAlan Stern #endif 31758808f00cSAlan Stern 31768808f00cSAlan Stern } else { 31775257d97aSAlan Stern status = -ENODEV; /* Don't resuscitate */ 31788808f00cSAlan Stern } 31798808f00cSAlan Stern usb_unlock_device(udev); 31808808f00cSAlan Stern 31818808f00cSAlan Stern if (status == 0) { 31828808f00cSAlan Stern clear_bit(port1, hub->change_bits); 31838808f00cSAlan Stern return; 31848808f00cSAlan Stern } 31858808f00cSAlan Stern } 31868808f00cSAlan Stern 318724618b0cSAlan Stern /* Disconnect any existing devices under this port */ 31888808f00cSAlan Stern if (udev) 318924618b0cSAlan Stern usb_disconnect(&hdev->children[port1-1]); 319024618b0cSAlan Stern clear_bit(port1, hub->change_bits); 319124618b0cSAlan Stern 3192253e0572SAlan Stern /* We can forget about a "removed" device when there's a physical 3193253e0572SAlan Stern * disconnect or the connect status changes. 3194253e0572SAlan Stern */ 3195253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 3196253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 3197253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 3198253e0572SAlan Stern 31995257d97aSAlan Stern if (portchange & (USB_PORT_STAT_C_CONNECTION | 32005257d97aSAlan Stern USB_PORT_STAT_C_ENABLE)) { 32015257d97aSAlan Stern status = hub_port_debounce(hub, port1); 32025257d97aSAlan Stern if (status < 0) { 32035257d97aSAlan Stern if (printk_ratelimit()) 32045257d97aSAlan Stern dev_err(hub_dev, "connect-debounce failed, " 32055257d97aSAlan Stern "port %d disabled\n", port1); 32065257d97aSAlan Stern portstatus &= ~USB_PORT_STAT_CONNECTION; 32075257d97aSAlan Stern } else { 32085257d97aSAlan Stern portstatus = status; 32095257d97aSAlan Stern } 32105257d97aSAlan Stern } 32115257d97aSAlan Stern 3212253e0572SAlan Stern /* Return now if debouncing failed or nothing is connected or 3213253e0572SAlan Stern * the device was "removed". 3214253e0572SAlan Stern */ 3215253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 3216253e0572SAlan Stern test_bit(port1, hub->removed_bits)) { 32171da177e4SLinus Torvalds 32181da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 321974ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 32200ed9a57eSAndiry Xu && !port_is_power_on(hub, portstatus)) 32211da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 32221da177e4SLinus Torvalds 32231da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 32241da177e4SLinus Torvalds goto done; 32251da177e4SLinus Torvalds return; 32261da177e4SLinus Torvalds } 32271da177e4SLinus Torvalds 32281da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 32291da177e4SLinus Torvalds 32301da177e4SLinus Torvalds /* reallocate for each attempt, since references 32311da177e4SLinus Torvalds * to the previous one can escape in various ways 32321da177e4SLinus Torvalds */ 32331da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 32341da177e4SLinus Torvalds if (!udev) { 32351da177e4SLinus Torvalds dev_err (hub_dev, 32361da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 32371da177e4SLinus Torvalds port1); 32381da177e4SLinus Torvalds goto done; 32391da177e4SLinus Torvalds } 32401da177e4SLinus Torvalds 32411da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 324255c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 3243b6956ffaSAlan Stern udev->level = hdev->level + 1; 32448af548dcSInaky Perez-Gonzalez udev->wusb = hub_is_wusb(hub); 32451da177e4SLinus Torvalds 3246131dec34SSarah Sharp /* Only USB 3.0 devices are connected to SuperSpeed hubs. */ 3247131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 3248e7b77172SSarah Sharp udev->speed = USB_SPEED_SUPER; 3249e7b77172SSarah Sharp else 3250e7b77172SSarah Sharp udev->speed = USB_SPEED_UNKNOWN; 3251e7b77172SSarah Sharp 32523b29b68bSAlan Stern choose_devnum(udev); 3253c6515272SSarah Sharp if (udev->devnum <= 0) { 3254c6515272SSarah Sharp status = -ENOTCONN; /* Don't retry */ 3255c6515272SSarah Sharp goto loop; 3256c6515272SSarah Sharp } 3257c6515272SSarah Sharp 3258e7b77172SSarah Sharp /* reset (non-USB 3.0 devices) and get descriptor */ 32591da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 32601da177e4SLinus Torvalds if (status < 0) 32611da177e4SLinus Torvalds goto loop; 32621da177e4SLinus Torvalds 326393362a87SPhil Dibowitz usb_detect_quirks(udev); 326493362a87SPhil Dibowitz if (udev->quirks & USB_QUIRK_DELAY_INIT) 326593362a87SPhil Dibowitz msleep(1000); 326693362a87SPhil Dibowitz 32671da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 32681da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 32691da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 32701da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 32711da177e4SLinus Torvalds * on the parent. 32721da177e4SLinus Torvalds */ 32731da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 327455c52718SAlan Stern && udev->bus_mA <= 100) { 32751da177e4SLinus Torvalds u16 devstat; 32761da177e4SLinus Torvalds 32771da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 32781da177e4SLinus Torvalds &devstat); 327955c52718SAlan Stern if (status < 2) { 32801da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 32811da177e4SLinus Torvalds goto loop_disable; 32821da177e4SLinus Torvalds } 328355c52718SAlan Stern le16_to_cpus(&devstat); 32841da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 32851da177e4SLinus Torvalds dev_err(&udev->dev, 32861da177e4SLinus Torvalds "can't connect bus-powered hub " 32871da177e4SLinus Torvalds "to this port\n"); 32881da177e4SLinus Torvalds if (hub->has_indicators) { 32891da177e4SLinus Torvalds hub->indicator[port1-1] = 32901da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 3291c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 32921da177e4SLinus Torvalds } 32931da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 32941da177e4SLinus Torvalds goto loop_disable; 32951da177e4SLinus Torvalds } 32961da177e4SLinus Torvalds } 32971da177e4SLinus Torvalds 32981da177e4SLinus Torvalds /* check for devices running slower than they could */ 32991da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 33001da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 33011da177e4SLinus Torvalds && highspeed_hubs != 0) 33021da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 33031da177e4SLinus Torvalds 33041da177e4SLinus Torvalds /* Store the parent's children[] pointer. At this point 33051da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 33061da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 33071da177e4SLinus Torvalds */ 33081da177e4SLinus Torvalds status = 0; 33091da177e4SLinus Torvalds 33101da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 33111da177e4SLinus Torvalds * been disconnected; we would race with the 33121da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 33131da177e4SLinus Torvalds */ 33141da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 33151da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 33161da177e4SLinus Torvalds status = -ENOTCONN; 33171da177e4SLinus Torvalds else 33181da177e4SLinus Torvalds hdev->children[port1-1] = udev; 33191da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 33201da177e4SLinus Torvalds 33211da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 33221da177e4SLinus Torvalds if (!status) { 33231da177e4SLinus Torvalds status = usb_new_device(udev); 33241da177e4SLinus Torvalds if (status) { 33251da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 33261da177e4SLinus Torvalds hdev->children[port1-1] = NULL; 33271da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 33281da177e4SLinus Torvalds } 33291da177e4SLinus Torvalds } 33301da177e4SLinus Torvalds 33311da177e4SLinus Torvalds if (status) 33321da177e4SLinus Torvalds goto loop_disable; 33331da177e4SLinus Torvalds 33341da177e4SLinus Torvalds status = hub_power_remaining(hub); 33351da177e4SLinus Torvalds if (status) 333655c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 33371da177e4SLinus Torvalds 33381da177e4SLinus Torvalds return; 33391da177e4SLinus Torvalds 33401da177e4SLinus Torvalds loop_disable: 33411da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 33421da177e4SLinus Torvalds loop: 3343fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 33443b29b68bSAlan Stern release_devnum(udev); 3345f7410cedSHerbert Xu hub_free_dev(udev); 33461da177e4SLinus Torvalds usb_put_dev(udev); 3347ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 33481da177e4SLinus Torvalds break; 33491da177e4SLinus Torvalds } 33503a31155cSAlan Stern if (hub->hdev->parent || 33513a31155cSAlan Stern !hcd->driver->port_handed_over || 33523a31155cSAlan Stern !(hcd->driver->port_handed_over)(hcd, port1)) 33533a31155cSAlan Stern dev_err(hub_dev, "unable to enumerate USB device on port %d\n", 33543a31155cSAlan Stern port1); 33551da177e4SLinus Torvalds 33561da177e4SLinus Torvalds done: 33571da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 335890da096eSBalaji Rao if (hcd->driver->relinquish_port && !hub->hdev->parent) 335990da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 33601da177e4SLinus Torvalds } 33611da177e4SLinus Torvalds 33621da177e4SLinus Torvalds static void hub_events(void) 33631da177e4SLinus Torvalds { 33641da177e4SLinus Torvalds struct list_head *tmp; 33651da177e4SLinus Torvalds struct usb_device *hdev; 33661da177e4SLinus Torvalds struct usb_interface *intf; 33671da177e4SLinus Torvalds struct usb_hub *hub; 33681da177e4SLinus Torvalds struct device *hub_dev; 33691da177e4SLinus Torvalds u16 hubstatus; 33701da177e4SLinus Torvalds u16 hubchange; 33711da177e4SLinus Torvalds u16 portstatus; 33721da177e4SLinus Torvalds u16 portchange; 33731da177e4SLinus Torvalds int i, ret; 33741da177e4SLinus Torvalds int connect_change; 33751da177e4SLinus Torvalds 33761da177e4SLinus Torvalds /* 33771da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 33781da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 33791da177e4SLinus Torvalds * safe since we delete the hub from the event list. 33801da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 33811da177e4SLinus Torvalds */ 33821da177e4SLinus Torvalds while (1) { 33831da177e4SLinus Torvalds 33841da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 33851da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 33861da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 33871da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 33881da177e4SLinus Torvalds break; 33891da177e4SLinus Torvalds } 33901da177e4SLinus Torvalds 33911da177e4SLinus Torvalds tmp = hub_event_list.next; 33921da177e4SLinus Torvalds list_del_init(tmp); 33931da177e4SLinus Torvalds 33941da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 3395e8054854SAlan Stern kref_get(&hub->kref); 3396e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 33971da177e4SLinus Torvalds 3398e8054854SAlan Stern hdev = hub->hdev; 3399e8054854SAlan Stern hub_dev = hub->intfdev; 3400e8054854SAlan Stern intf = to_usb_interface(hub_dev); 340140f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 34021da177e4SLinus Torvalds hdev->state, hub->descriptor 34031da177e4SLinus Torvalds ? hub->descriptor->bNbrPorts 34041da177e4SLinus Torvalds : 0, 34051da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 34061da177e4SLinus Torvalds (u16) hub->change_bits[0], 340740f122f3SAlan Stern (u16) hub->event_bits[0]); 34081da177e4SLinus Torvalds 34091da177e4SLinus Torvalds /* Lock the device, then check to see if we were 34101da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 341106b84e8aSAlan Stern usb_lock_device(hdev); 3412e8054854SAlan Stern if (unlikely(hub->disconnected)) 34139bbdf1e0SAlan Stern goto loop_disconnected; 34141da177e4SLinus Torvalds 34151da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 34161da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 34177de18d8bSAlan Stern hub->error = -ENODEV; 34184330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 34191da177e4SLinus Torvalds goto loop; 34201da177e4SLinus Torvalds } 34211da177e4SLinus Torvalds 342240f122f3SAlan Stern /* Autoresume */ 342340f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 342440f122f3SAlan Stern if (ret) { 342540f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 34261da177e4SLinus Torvalds goto loop; 342740f122f3SAlan Stern } 342840f122f3SAlan Stern 342940f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 343040f122f3SAlan Stern if (hub->quiescing) 343140f122f3SAlan Stern goto loop_autopm; 34321da177e4SLinus Torvalds 34331da177e4SLinus Torvalds if (hub->error) { 34341da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 34351da177e4SLinus Torvalds hub->error); 34361da177e4SLinus Torvalds 3437742120c6SMing Lei ret = usb_reset_device(hdev); 34381da177e4SLinus Torvalds if (ret) { 34391da177e4SLinus Torvalds dev_dbg (hub_dev, 34401da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 344140f122f3SAlan Stern goto loop_autopm; 34421da177e4SLinus Torvalds } 34431da177e4SLinus Torvalds 34441da177e4SLinus Torvalds hub->nerrors = 0; 34451da177e4SLinus Torvalds hub->error = 0; 34461da177e4SLinus Torvalds } 34471da177e4SLinus Torvalds 34481da177e4SLinus Torvalds /* deal with port status changes */ 34491da177e4SLinus Torvalds for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { 34501da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 34511da177e4SLinus Torvalds continue; 34521da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 34531da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 34546ee0b270SAlan Stern !connect_change) 34551da177e4SLinus Torvalds continue; 34561da177e4SLinus Torvalds 34571da177e4SLinus Torvalds ret = hub_port_status(hub, i, 34581da177e4SLinus Torvalds &portstatus, &portchange); 34591da177e4SLinus Torvalds if (ret < 0) 34601da177e4SLinus Torvalds continue; 34611da177e4SLinus Torvalds 34621da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 34631da177e4SLinus Torvalds clear_port_feature(hdev, i, 34641da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 34651da177e4SLinus Torvalds connect_change = 1; 34661da177e4SLinus Torvalds } 34671da177e4SLinus Torvalds 34681da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 34691da177e4SLinus Torvalds if (!connect_change) 34701da177e4SLinus Torvalds dev_dbg (hub_dev, 34711da177e4SLinus Torvalds "port %d enable change, " 34721da177e4SLinus Torvalds "status %08x\n", 34731da177e4SLinus Torvalds i, portstatus); 34741da177e4SLinus Torvalds clear_port_feature(hdev, i, 34751da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 34761da177e4SLinus Torvalds 34771da177e4SLinus Torvalds /* 34781da177e4SLinus Torvalds * EM interference sometimes causes badly 34791da177e4SLinus Torvalds * shielded USB devices to be shutdown by 34801da177e4SLinus Torvalds * the hub, this hack enables them again. 34811da177e4SLinus Torvalds * Works at least with mouse driver. 34821da177e4SLinus Torvalds */ 34831da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 34841da177e4SLinus Torvalds && !connect_change 34851da177e4SLinus Torvalds && hdev->children[i-1]) { 34861da177e4SLinus Torvalds dev_err (hub_dev, 34871da177e4SLinus Torvalds "port %i " 34881da177e4SLinus Torvalds "disabled by hub (EMI?), " 34891da177e4SLinus Torvalds "re-enabling...\n", 34901da177e4SLinus Torvalds i); 34911da177e4SLinus Torvalds connect_change = 1; 34921da177e4SLinus Torvalds } 34931da177e4SLinus Torvalds } 34941da177e4SLinus Torvalds 34951da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_SUSPEND) { 34968808f00cSAlan Stern struct usb_device *udev; 34978808f00cSAlan Stern 34981da177e4SLinus Torvalds clear_port_feature(hdev, i, 34991da177e4SLinus Torvalds USB_PORT_FEAT_C_SUSPEND); 35008808f00cSAlan Stern udev = hdev->children[i-1]; 35018808f00cSAlan Stern if (udev) { 350249d0f078SAlan Stern /* TRSMRCY = 10 msec */ 350349d0f078SAlan Stern msleep(10); 350449d0f078SAlan Stern 35058808f00cSAlan Stern usb_lock_device(udev); 35060534d468SAlan Stern ret = usb_remote_wakeup(hdev-> 35071da177e4SLinus Torvalds children[i-1]); 35088808f00cSAlan Stern usb_unlock_device(udev); 35091da177e4SLinus Torvalds if (ret < 0) 35101da177e4SLinus Torvalds connect_change = 1; 35111da177e4SLinus Torvalds } else { 35121da177e4SLinus Torvalds ret = -ENODEV; 35131da177e4SLinus Torvalds hub_port_disable(hub, i, 1); 35141da177e4SLinus Torvalds } 35151da177e4SLinus Torvalds dev_dbg (hub_dev, 35161da177e4SLinus Torvalds "resume on port %d, status %d\n", 35171da177e4SLinus Torvalds i, ret); 35181da177e4SLinus Torvalds } 35191da177e4SLinus Torvalds 35201da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 3521752d57a8SPaul Bolle u16 status = 0; 3522752d57a8SPaul Bolle u16 unused; 3523752d57a8SPaul Bolle 3524752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change on port " 3525752d57a8SPaul Bolle "%d\n", i); 35261da177e4SLinus Torvalds clear_port_feature(hdev, i, 35271da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 3528752d57a8SPaul Bolle msleep(100); /* Cool down */ 35298520f380SAlan Stern hub_power_on(hub, true); 3530752d57a8SPaul Bolle hub_port_status(hub, i, &status, &unused); 3531752d57a8SPaul Bolle if (status & USB_PORT_STAT_OVERCURRENT) 3532752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 3533752d57a8SPaul Bolle "condition on port %d\n", i); 35341da177e4SLinus Torvalds } 35351da177e4SLinus Torvalds 35361da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 35371da177e4SLinus Torvalds dev_dbg (hub_dev, 35381da177e4SLinus Torvalds "reset change on port %d\n", 35391da177e4SLinus Torvalds i); 35401da177e4SLinus Torvalds clear_port_feature(hdev, i, 35411da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 35421da177e4SLinus Torvalds } 3543c7061574SSarah Sharp if ((portchange & USB_PORT_STAT_C_BH_RESET) && 3544c7061574SSarah Sharp hub_is_superspeed(hub->hdev)) { 3545c7061574SSarah Sharp dev_dbg(hub_dev, 3546c7061574SSarah Sharp "warm reset change on port %d\n", 3547c7061574SSarah Sharp i); 3548c7061574SSarah Sharp clear_port_feature(hdev, i, 3549c7061574SSarah Sharp USB_PORT_FEAT_C_BH_PORT_RESET); 3550c7061574SSarah Sharp } 3551dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_LINK_STATE) { 3552dbe79bbeSJohn Youn clear_port_feature(hub->hdev, i, 3553dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_LINK_STATE); 3554dbe79bbeSJohn Youn } 3555dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { 3556dbe79bbeSJohn Youn dev_warn(hub_dev, 3557dbe79bbeSJohn Youn "config error on port %d\n", 3558dbe79bbeSJohn Youn i); 3559dbe79bbeSJohn Youn clear_port_feature(hub->hdev, i, 3560dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_CONFIG_ERROR); 3561dbe79bbeSJohn Youn } 35621da177e4SLinus Torvalds 35635e467f6eSAndiry Xu /* Warm reset a USB3 protocol port if it's in 35645e467f6eSAndiry Xu * SS.Inactive state. 35655e467f6eSAndiry Xu */ 35665e467f6eSAndiry Xu if (hub_is_superspeed(hub->hdev) && 35675e467f6eSAndiry Xu (portstatus & USB_PORT_STAT_LINK_STATE) 35685e467f6eSAndiry Xu == USB_SS_PORT_LS_SS_INACTIVE) { 35695e467f6eSAndiry Xu dev_dbg(hub_dev, "warm reset port %d\n", i); 35705e467f6eSAndiry Xu hub_port_warm_reset(hub, i); 35715e467f6eSAndiry Xu } 35725e467f6eSAndiry Xu 35731da177e4SLinus Torvalds if (connect_change) 35741da177e4SLinus Torvalds hub_port_connect_change(hub, i, 35751da177e4SLinus Torvalds portstatus, portchange); 35761da177e4SLinus Torvalds } /* end for i */ 35771da177e4SLinus Torvalds 35781da177e4SLinus Torvalds /* deal with hub status changes */ 35791da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 35801da177e4SLinus Torvalds ; /* do nothing */ 35811da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 35821da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 35831da177e4SLinus Torvalds else { 35841da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 35851da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 35861da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 358755c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 358855c52718SAlan Stern /* FIXME: Is this always true? */ 358955c52718SAlan Stern hub->limited_power = 1; 3590403fae78Sjidong xiao else 3591403fae78Sjidong xiao hub->limited_power = 0; 35921da177e4SLinus Torvalds } 35931da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 3594752d57a8SPaul Bolle u16 status = 0; 3595752d57a8SPaul Bolle u16 unused; 3596752d57a8SPaul Bolle 3597752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change\n"); 35981da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 3599752d57a8SPaul Bolle msleep(500); /* Cool down */ 36008520f380SAlan Stern hub_power_on(hub, true); 3601752d57a8SPaul Bolle hub_hub_status(hub, &status, &unused); 3602752d57a8SPaul Bolle if (status & HUB_STATUS_OVERCURRENT) 3603752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 3604752d57a8SPaul Bolle "condition\n"); 36051da177e4SLinus Torvalds } 36061da177e4SLinus Torvalds } 36071da177e4SLinus Torvalds 360840f122f3SAlan Stern loop_autopm: 36098e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface() above */ 36108e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 36111da177e4SLinus Torvalds loop: 36128e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface_no_resume() in 36138e4ceb38SAlan Stern * kick_khubd() and allow autosuspend. 36148e4ceb38SAlan Stern */ 36158e4ceb38SAlan Stern usb_autopm_put_interface(intf); 36169bbdf1e0SAlan Stern loop_disconnected: 36171da177e4SLinus Torvalds usb_unlock_device(hdev); 3618e8054854SAlan Stern kref_put(&hub->kref, hub_release); 36191da177e4SLinus Torvalds 36201da177e4SLinus Torvalds } /* end while (1) */ 36211da177e4SLinus Torvalds } 36221da177e4SLinus Torvalds 36231da177e4SLinus Torvalds static int hub_thread(void *__unused) 36241da177e4SLinus Torvalds { 36253bb1af52SAlan Stern /* khubd needs to be freezable to avoid intefering with USB-PERSIST 36263bb1af52SAlan Stern * port handover. Otherwise it might see that a full-speed device 36273bb1af52SAlan Stern * was gone before the EHCI controller had handed its port over to 36283bb1af52SAlan Stern * the companion full-speed controller. 36293bb1af52SAlan Stern */ 363083144186SRafael J. Wysocki set_freezable(); 36313bb1af52SAlan Stern 36321da177e4SLinus Torvalds do { 36331da177e4SLinus Torvalds hub_events(); 3634e42837bcSRafael J. Wysocki wait_event_freezable(khubd_wait, 36359c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 36369c8d6178Sakpm@osdl.org kthread_should_stop()); 36379c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 36381da177e4SLinus Torvalds 36391da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 36409c8d6178Sakpm@osdl.org return 0; 36411da177e4SLinus Torvalds } 36421da177e4SLinus Torvalds 36431e927d96SNémeth Márton static const struct usb_device_id hub_id_table[] = { 36441da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 36451da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 36461da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 36471da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 36481da177e4SLinus Torvalds { } /* Terminating entry */ 36491da177e4SLinus Torvalds }; 36501da177e4SLinus Torvalds 36511da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 36521da177e4SLinus Torvalds 36531da177e4SLinus Torvalds static struct usb_driver hub_driver = { 36541da177e4SLinus Torvalds .name = "hub", 36551da177e4SLinus Torvalds .probe = hub_probe, 36561da177e4SLinus Torvalds .disconnect = hub_disconnect, 36571da177e4SLinus Torvalds .suspend = hub_suspend, 36581da177e4SLinus Torvalds .resume = hub_resume, 3659f07600cfSAlan Stern .reset_resume = hub_reset_resume, 36607de18d8bSAlan Stern .pre_reset = hub_pre_reset, 36617de18d8bSAlan Stern .post_reset = hub_post_reset, 3662c532b29aSAndi Kleen .unlocked_ioctl = hub_ioctl, 36631da177e4SLinus Torvalds .id_table = hub_id_table, 366440f122f3SAlan Stern .supports_autosuspend = 1, 36651da177e4SLinus Torvalds }; 36661da177e4SLinus Torvalds 36671da177e4SLinus Torvalds int usb_hub_init(void) 36681da177e4SLinus Torvalds { 36691da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 36701da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 36711da177e4SLinus Torvalds usbcore_name); 36721da177e4SLinus Torvalds return -1; 36731da177e4SLinus Torvalds } 36741da177e4SLinus Torvalds 36759c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 36769c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 36771da177e4SLinus Torvalds return 0; 36781da177e4SLinus Torvalds 36791da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 36801da177e4SLinus Torvalds usb_deregister(&hub_driver); 36811da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 36821da177e4SLinus Torvalds 36831da177e4SLinus Torvalds return -1; 36841da177e4SLinus Torvalds } 36851da177e4SLinus Torvalds 36861da177e4SLinus Torvalds void usb_hub_cleanup(void) 36871da177e4SLinus Torvalds { 36889c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 36891da177e4SLinus Torvalds 36901da177e4SLinus Torvalds /* 36911da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 36921da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 36931da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 36941da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 36951da177e4SLinus Torvalds * individual hub resources. -greg 36961da177e4SLinus Torvalds */ 36971da177e4SLinus Torvalds usb_deregister(&hub_driver); 36981da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 36991da177e4SLinus Torvalds 3700eb764c4bSAlan Stern static int descriptors_changed(struct usb_device *udev, 3701eb764c4bSAlan Stern struct usb_device_descriptor *old_device_descriptor) 37021da177e4SLinus Torvalds { 3703eb764c4bSAlan Stern int changed = 0; 37041da177e4SLinus Torvalds unsigned index; 3705eb764c4bSAlan Stern unsigned serial_len = 0; 3706eb764c4bSAlan Stern unsigned len; 3707eb764c4bSAlan Stern unsigned old_length; 3708eb764c4bSAlan Stern int length; 3709eb764c4bSAlan Stern char *buf; 37101da177e4SLinus Torvalds 3711eb764c4bSAlan Stern if (memcmp(&udev->descriptor, old_device_descriptor, 3712eb764c4bSAlan Stern sizeof(*old_device_descriptor)) != 0) 3713eb764c4bSAlan Stern return 1; 3714eb764c4bSAlan Stern 3715eb764c4bSAlan Stern /* Since the idVendor, idProduct, and bcdDevice values in the 3716eb764c4bSAlan Stern * device descriptor haven't changed, we will assume the 3717eb764c4bSAlan Stern * Manufacturer and Product strings haven't changed either. 3718eb764c4bSAlan Stern * But the SerialNumber string could be different (e.g., a 3719eb764c4bSAlan Stern * different flash card of the same brand). 3720eb764c4bSAlan Stern */ 3721eb764c4bSAlan Stern if (udev->serial) 3722eb764c4bSAlan Stern serial_len = strlen(udev->serial) + 1; 3723eb764c4bSAlan Stern 3724eb764c4bSAlan Stern len = serial_len; 37251da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 3726eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 3727eb764c4bSAlan Stern len = max(len, old_length); 37281da177e4SLinus Torvalds } 3729eb764c4bSAlan Stern 37300cc1a51fSOliver Neukum buf = kmalloc(len, GFP_NOIO); 37311da177e4SLinus Torvalds if (buf == NULL) { 37321da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 37331da177e4SLinus Torvalds /* assume the worst */ 37341da177e4SLinus Torvalds return 1; 37351da177e4SLinus Torvalds } 37361da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 3737eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 37381da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 37391da177e4SLinus Torvalds old_length); 3740eb764c4bSAlan Stern if (length != old_length) { 37411da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 37421da177e4SLinus Torvalds index, length); 3743eb764c4bSAlan Stern changed = 1; 37441da177e4SLinus Torvalds break; 37451da177e4SLinus Torvalds } 37461da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 37471da177e4SLinus Torvalds != 0) { 37481da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 3749eb764c4bSAlan Stern index, 3750eb764c4bSAlan Stern ((struct usb_config_descriptor *) buf)-> 3751eb764c4bSAlan Stern bConfigurationValue); 3752eb764c4bSAlan Stern changed = 1; 37531da177e4SLinus Torvalds break; 37541da177e4SLinus Torvalds } 37551da177e4SLinus Torvalds } 3756eb764c4bSAlan Stern 3757eb764c4bSAlan Stern if (!changed && serial_len) { 3758eb764c4bSAlan Stern length = usb_string(udev, udev->descriptor.iSerialNumber, 3759eb764c4bSAlan Stern buf, serial_len); 3760eb764c4bSAlan Stern if (length + 1 != serial_len) { 3761eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string error %d\n", 3762eb764c4bSAlan Stern length); 3763eb764c4bSAlan Stern changed = 1; 3764eb764c4bSAlan Stern } else if (memcmp(buf, udev->serial, length) != 0) { 3765eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string changed\n"); 3766eb764c4bSAlan Stern changed = 1; 3767eb764c4bSAlan Stern } 3768eb764c4bSAlan Stern } 3769eb764c4bSAlan Stern 37701da177e4SLinus Torvalds kfree(buf); 3771eb764c4bSAlan Stern return changed; 37721da177e4SLinus Torvalds } 37731da177e4SLinus Torvalds 37741da177e4SLinus Torvalds /** 3775742120c6SMing Lei * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device 37761da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 37771da177e4SLinus Torvalds * 377879efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 377979efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 3780742120c6SMing Lei * Use usb_reset_device() instead. 37811da177e4SLinus Torvalds * 37821da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 37831da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 37841da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 37851da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 37861da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 37871da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 37881da177e4SLinus Torvalds * re-enumerated and probed all over again. 37891da177e4SLinus Torvalds * 37901da177e4SLinus Torvalds * Returns 0 if the reset succeeded, -ENODEV if the device has been 37911da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 37921da177e4SLinus Torvalds * if the reset wasn't even attempted. 37931da177e4SLinus Torvalds * 37941da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 37951da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 37961da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 37971da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 37986bc6cff5SAlan Stern * 37996bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 38006bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 38016bc6cff5SAlan Stern * holding the device lock because these tasks should always call 38026bc6cff5SAlan Stern * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. 38031da177e4SLinus Torvalds */ 3804742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev) 38051da177e4SLinus Torvalds { 38061da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 38071da177e4SLinus Torvalds struct usb_hub *parent_hub; 38083f0479e0SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 38091da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 381012c3da34SAlan Stern int i, ret = 0; 381112c3da34SAlan Stern int port1 = udev->portnum; 38121da177e4SLinus Torvalds 38131da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 38141da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 38151da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 38161da177e4SLinus Torvalds udev->state); 38171da177e4SLinus Torvalds return -EINVAL; 38181da177e4SLinus Torvalds } 38191da177e4SLinus Torvalds 38201da177e4SLinus Torvalds if (!parent_hdev) { 38214bec9917SWolfram Sang /* this requires hcd-specific logic; see ohci_restart() */ 3822441b62c1SHarvey Harrison dev_dbg(&udev->dev, "%s for root hub!\n", __func__); 38231da177e4SLinus Torvalds return -EISDIR; 38241da177e4SLinus Torvalds } 38251da177e4SLinus Torvalds parent_hub = hdev_to_hub(parent_hdev); 38261da177e4SLinus Torvalds 38271da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 38281da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 38291da177e4SLinus Torvalds 38301da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 38311da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 3832fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 38331da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 3834dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 38351da177e4SLinus Torvalds break; 38361da177e4SLinus Torvalds } 38371da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 3838d5cbad4bSAlan Stern 38391da177e4SLinus Torvalds if (ret < 0) 38401da177e4SLinus Torvalds goto re_enumerate; 38411da177e4SLinus Torvalds 38421da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 3843eb764c4bSAlan Stern if (descriptors_changed(udev, &descriptor)) { 38441da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 38451da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 38461da177e4SLinus Torvalds goto re_enumerate; 38471da177e4SLinus Torvalds } 38481da177e4SLinus Torvalds 38494fe0387aSAlan Stern /* Restore the device's previous configuration */ 38501da177e4SLinus Torvalds if (!udev->actconfig) 38511da177e4SLinus Torvalds goto done; 38523f0479e0SSarah Sharp 3853d673bfcbSSarah Sharp mutex_lock(hcd->bandwidth_mutex); 38543f0479e0SSarah Sharp ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); 38553f0479e0SSarah Sharp if (ret < 0) { 38563f0479e0SSarah Sharp dev_warn(&udev->dev, 38573f0479e0SSarah Sharp "Busted HC? Not enough HCD resources for " 38583f0479e0SSarah Sharp "old configuration.\n"); 3859d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 38603f0479e0SSarah Sharp goto re_enumerate; 38613f0479e0SSarah Sharp } 38621da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 38631da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 38641da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 38651da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 38661da177e4SLinus Torvalds if (ret < 0) { 38671da177e4SLinus Torvalds dev_err(&udev->dev, 38681da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 38691da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 3870d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 38711da177e4SLinus Torvalds goto re_enumerate; 38721da177e4SLinus Torvalds } 3873d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 38741da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 38751da177e4SLinus Torvalds 38764fe0387aSAlan Stern /* Put interfaces back into the same altsettings as before. 38774fe0387aSAlan Stern * Don't bother to send the Set-Interface request for interfaces 38784fe0387aSAlan Stern * that were already in altsetting 0; besides being unnecessary, 38794fe0387aSAlan Stern * many devices can't handle it. Instead just reset the host-side 38804fe0387aSAlan Stern * endpoint state. 38814fe0387aSAlan Stern */ 38821da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 38833f0479e0SSarah Sharp struct usb_host_config *config = udev->actconfig; 38843f0479e0SSarah Sharp struct usb_interface *intf = config->interface[i]; 38851da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 38861da177e4SLinus Torvalds 38871da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 38884fe0387aSAlan Stern if (desc->bAlternateSetting == 0) { 38894fe0387aSAlan Stern usb_disable_interface(udev, intf, true); 38904fe0387aSAlan Stern usb_enable_interface(udev, intf, true); 38914fe0387aSAlan Stern ret = 0; 38924fe0387aSAlan Stern } else { 389304a723eaSSarah Sharp /* Let the bandwidth allocation function know that this 389404a723eaSSarah Sharp * device has been reset, and it will have to use 389504a723eaSSarah Sharp * alternate setting 0 as the current alternate setting. 38963f0479e0SSarah Sharp */ 389704a723eaSSarah Sharp intf->resetting_device = 1; 38981da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 38991da177e4SLinus Torvalds desc->bAlternateSetting); 390004a723eaSSarah Sharp intf->resetting_device = 0; 39014fe0387aSAlan Stern } 39021da177e4SLinus Torvalds if (ret < 0) { 39031da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 39041da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 39051da177e4SLinus Torvalds desc->bInterfaceNumber, 39061da177e4SLinus Torvalds desc->bAlternateSetting, 39071da177e4SLinus Torvalds ret); 39081da177e4SLinus Torvalds goto re_enumerate; 39091da177e4SLinus Torvalds } 39101da177e4SLinus Torvalds } 39111da177e4SLinus Torvalds 39121da177e4SLinus Torvalds done: 39131da177e4SLinus Torvalds return 0; 39141da177e4SLinus Torvalds 39151da177e4SLinus Torvalds re_enumerate: 39161da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 39171da177e4SLinus Torvalds return -ENODEV; 39181da177e4SLinus Torvalds } 391979efa097SAlan Stern 392079efa097SAlan Stern /** 3921742120c6SMing Lei * usb_reset_device - warn interface drivers and perform a USB port reset 392279efa097SAlan Stern * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 392379efa097SAlan Stern * 392479efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 392579efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 392679efa097SAlan Stern * the reset is over (using their post_reset method). 392779efa097SAlan Stern * 3928742120c6SMing Lei * Return value is the same as for usb_reset_and_verify_device(). 392979efa097SAlan Stern * 393079efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 393179efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 393279efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 393379efa097SAlan Stern * the device using usb_lock_device_for_reset(). 393478d9a487SAlan Stern * 393578d9a487SAlan Stern * If an interface is currently being probed or disconnected, we assume 393678d9a487SAlan Stern * its driver knows how to handle resets. For all other interfaces, 393778d9a487SAlan Stern * if the driver doesn't have pre_reset and post_reset methods then 393878d9a487SAlan Stern * we attempt to unbind it and rebind afterward. 393979efa097SAlan Stern */ 3940742120c6SMing Lei int usb_reset_device(struct usb_device *udev) 394179efa097SAlan Stern { 394279efa097SAlan Stern int ret; 3943852c4b43SAlan Stern int i; 394479efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 394579efa097SAlan Stern 394679efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 394779efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 394879efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 394979efa097SAlan Stern udev->state); 395079efa097SAlan Stern return -EINVAL; 395179efa097SAlan Stern } 395279efa097SAlan Stern 3953645daaabSAlan Stern /* Prevent autosuspend during the reset */ 395494fcda1fSAlan Stern usb_autoresume_device(udev); 3955645daaabSAlan Stern 395679efa097SAlan Stern if (config) { 3957852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 3958852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 395979efa097SAlan Stern struct usb_driver *drv; 396078d9a487SAlan Stern int unbind = 0; 396179efa097SAlan Stern 3962852c4b43SAlan Stern if (cintf->dev.driver) { 396379efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 396478d9a487SAlan Stern if (drv->pre_reset && drv->post_reset) 396578d9a487SAlan Stern unbind = (drv->pre_reset)(cintf); 396678d9a487SAlan Stern else if (cintf->condition == 396778d9a487SAlan Stern USB_INTERFACE_BOUND) 396878d9a487SAlan Stern unbind = 1; 396978d9a487SAlan Stern if (unbind) 397078d9a487SAlan Stern usb_forced_unbind_intf(cintf); 397179efa097SAlan Stern } 397279efa097SAlan Stern } 397379efa097SAlan Stern } 397479efa097SAlan Stern 3975742120c6SMing Lei ret = usb_reset_and_verify_device(udev); 397679efa097SAlan Stern 397779efa097SAlan Stern if (config) { 3978852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 3979852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 398079efa097SAlan Stern struct usb_driver *drv; 398178d9a487SAlan Stern int rebind = cintf->needs_binding; 398279efa097SAlan Stern 398378d9a487SAlan Stern if (!rebind && cintf->dev.driver) { 398479efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 398579efa097SAlan Stern if (drv->post_reset) 398678d9a487SAlan Stern rebind = (drv->post_reset)(cintf); 398778d9a487SAlan Stern else if (cintf->condition == 398878d9a487SAlan Stern USB_INTERFACE_BOUND) 398978d9a487SAlan Stern rebind = 1; 399079efa097SAlan Stern } 39916c640945SAlan Stern if (ret == 0 && rebind) 399278d9a487SAlan Stern usb_rebind_intf(cintf); 399379efa097SAlan Stern } 399479efa097SAlan Stern } 399579efa097SAlan Stern 399694fcda1fSAlan Stern usb_autosuspend_device(udev); 399779efa097SAlan Stern return ret; 399879efa097SAlan Stern } 3999742120c6SMing Lei EXPORT_SYMBOL_GPL(usb_reset_device); 4000dc023dceSInaky Perez-Gonzalez 4001dc023dceSInaky Perez-Gonzalez 4002dc023dceSInaky Perez-Gonzalez /** 4003dc023dceSInaky Perez-Gonzalez * usb_queue_reset_device - Reset a USB device from an atomic context 4004dc023dceSInaky Perez-Gonzalez * @iface: USB interface belonging to the device to reset 4005dc023dceSInaky Perez-Gonzalez * 4006dc023dceSInaky Perez-Gonzalez * This function can be used to reset a USB device from an atomic 4007dc023dceSInaky Perez-Gonzalez * context, where usb_reset_device() won't work (as it blocks). 4008dc023dceSInaky Perez-Gonzalez * 4009dc023dceSInaky Perez-Gonzalez * Doing a reset via this method is functionally equivalent to calling 4010dc023dceSInaky Perez-Gonzalez * usb_reset_device(), except for the fact that it is delayed to a 4011dc023dceSInaky Perez-Gonzalez * workqueue. This means that any drivers bound to other interfaces 4012dc023dceSInaky Perez-Gonzalez * might be unbound, as well as users from usbfs in user space. 4013dc023dceSInaky Perez-Gonzalez * 4014dc023dceSInaky Perez-Gonzalez * Corner cases: 4015dc023dceSInaky Perez-Gonzalez * 4016dc023dceSInaky Perez-Gonzalez * - Scheduling two resets at the same time from two different drivers 4017dc023dceSInaky Perez-Gonzalez * attached to two different interfaces of the same device is 4018dc023dceSInaky Perez-Gonzalez * possible; depending on how the driver attached to each interface 4019dc023dceSInaky Perez-Gonzalez * handles ->pre_reset(), the second reset might happen or not. 4020dc023dceSInaky Perez-Gonzalez * 4021dc023dceSInaky Perez-Gonzalez * - If a driver is unbound and it had a pending reset, the reset will 4022dc023dceSInaky Perez-Gonzalez * be cancelled. 4023dc023dceSInaky Perez-Gonzalez * 4024dc023dceSInaky Perez-Gonzalez * - This function can be called during .probe() or .disconnect() 4025dc023dceSInaky Perez-Gonzalez * times. On return from .disconnect(), any pending resets will be 4026dc023dceSInaky Perez-Gonzalez * cancelled. 4027dc023dceSInaky Perez-Gonzalez * 4028dc023dceSInaky Perez-Gonzalez * There is no no need to lock/unlock the @reset_ws as schedule_work() 4029dc023dceSInaky Perez-Gonzalez * does its own. 4030dc023dceSInaky Perez-Gonzalez * 4031dc023dceSInaky Perez-Gonzalez * NOTE: We don't do any reference count tracking because it is not 4032dc023dceSInaky Perez-Gonzalez * needed. The lifecycle of the work_struct is tied to the 4033dc023dceSInaky Perez-Gonzalez * usb_interface. Before destroying the interface we cancel the 4034dc023dceSInaky Perez-Gonzalez * work_struct, so the fact that work_struct is queued and or 4035dc023dceSInaky Perez-Gonzalez * running means the interface (and thus, the device) exist and 4036dc023dceSInaky Perez-Gonzalez * are referenced. 4037dc023dceSInaky Perez-Gonzalez */ 4038dc023dceSInaky Perez-Gonzalez void usb_queue_reset_device(struct usb_interface *iface) 4039dc023dceSInaky Perez-Gonzalez { 4040dc023dceSInaky Perez-Gonzalez schedule_work(&iface->reset_ws); 4041dc023dceSInaky Perez-Gonzalez } 4042dc023dceSInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_queue_reset_device); 4043