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 { 877bf01185SAman Deep return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS); 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 */ 10590ab5ee9SRusty Russell static bool 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 */ 13490ab5ee9SRusty Russell static bool 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 13990ab5ee9SRusty Russell static bool 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 708a45aa3b3SElric Fu /* The superspeed hub except for root hub has to use Hub Depth 709a45aa3b3SElric Fu * value as an offset into the route string to locate the bits 710a45aa3b3SElric Fu * it uses to determine the downstream port number. So hub driver 711a45aa3b3SElric Fu * should send a set hub depth request to superspeed hub after 712a45aa3b3SElric Fu * the superspeed hub is set configuration in initialization or 713a45aa3b3SElric Fu * reset procedure. 714a45aa3b3SElric Fu * 715a45aa3b3SElric Fu * After a resume, port power should still be on. 716f2835219SAlan Stern * For any other type of activation, turn it on. 717f2835219SAlan Stern */ 7188520f380SAlan Stern if (type != HUB_RESUME) { 719a45aa3b3SElric Fu if (hdev->parent && hub_is_superspeed(hdev)) { 720a45aa3b3SElric Fu ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 721a45aa3b3SElric Fu HUB_SET_DEPTH, USB_RT_HUB, 722a45aa3b3SElric Fu hdev->level - 1, 0, NULL, 0, 723a45aa3b3SElric Fu USB_CTRL_SET_TIMEOUT); 724a45aa3b3SElric Fu if (ret < 0) 725a45aa3b3SElric Fu dev_err(hub->intfdev, 726a45aa3b3SElric Fu "set hub depth failed\n"); 727a45aa3b3SElric Fu } 7288520f380SAlan Stern 7298520f380SAlan Stern /* Speed up system boot by using a delayed_work for the 7308520f380SAlan Stern * hub's initial power-up delays. This is pretty awkward 7318520f380SAlan Stern * and the implementation looks like a home-brewed sort of 7328520f380SAlan Stern * setjmp/longjmp, but it saves at least 100 ms for each 7338520f380SAlan Stern * root hub (assuming usbcore is compiled into the kernel 7348520f380SAlan Stern * rather than as a module). It adds up. 7358520f380SAlan Stern * 7368520f380SAlan Stern * This can't be done for HUB_RESUME or HUB_RESET_RESUME 7378520f380SAlan Stern * because for those activation types the ports have to be 7388520f380SAlan Stern * operational when we return. In theory this could be done 7398520f380SAlan Stern * for HUB_POST_RESET, but it's easier not to. 7408520f380SAlan Stern */ 7418520f380SAlan Stern if (type == HUB_INIT) { 7428520f380SAlan Stern delay = hub_power_on(hub, false); 7438520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); 7448520f380SAlan Stern schedule_delayed_work(&hub->init_work, 7458520f380SAlan Stern msecs_to_jiffies(delay)); 74661fbeba1SAlan Stern 74761fbeba1SAlan Stern /* Suppress autosuspend until init is done */ 7488e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 7498e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 7508520f380SAlan Stern return; /* Continues at init2: below */ 751653a39d1SSarah Sharp } else if (type == HUB_RESET_RESUME) { 752653a39d1SSarah Sharp /* The internal host controller state for the hub device 753653a39d1SSarah Sharp * may be gone after a host power loss on system resume. 754653a39d1SSarah Sharp * Update the device's info so the HW knows it's a hub. 755653a39d1SSarah Sharp */ 756653a39d1SSarah Sharp hcd = bus_to_hcd(hdev->bus); 757653a39d1SSarah Sharp if (hcd->driver->update_hub_device) { 758653a39d1SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 759653a39d1SSarah Sharp &hub->tt, GFP_NOIO); 760653a39d1SSarah Sharp if (ret < 0) { 761653a39d1SSarah Sharp dev_err(hub->intfdev, "Host not " 762653a39d1SSarah Sharp "accepting hub info " 763653a39d1SSarah Sharp "update.\n"); 764653a39d1SSarah Sharp dev_err(hub->intfdev, "LS/FS devices " 765653a39d1SSarah Sharp "and hubs may not work " 766653a39d1SSarah Sharp "under this hub\n."); 767653a39d1SSarah Sharp } 768653a39d1SSarah Sharp } 769653a39d1SSarah Sharp hub_power_on(hub, true); 7708520f380SAlan Stern } else { 7718520f380SAlan Stern hub_power_on(hub, true); 7728520f380SAlan Stern } 7738520f380SAlan Stern } 7748520f380SAlan Stern init2: 775f2835219SAlan Stern 7766ee0b270SAlan Stern /* Check each port and set hub->change_bits to let khubd know 7776ee0b270SAlan Stern * which ports need attention. 7785e6effaeSAlan Stern */ 7795e6effaeSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 7805e6effaeSAlan Stern struct usb_device *udev = hdev->children[port1-1]; 7815e6effaeSAlan Stern u16 portstatus, portchange; 7825e6effaeSAlan Stern 7836ee0b270SAlan Stern portstatus = portchange = 0; 7846ee0b270SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 7856ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 7866ee0b270SAlan Stern dev_dbg(hub->intfdev, 7876ee0b270SAlan Stern "port %d: status %04x change %04x\n", 7886ee0b270SAlan Stern port1, portstatus, portchange); 7895e6effaeSAlan Stern 7906ee0b270SAlan Stern /* After anything other than HUB_RESUME (i.e., initialization 7916ee0b270SAlan Stern * or any sort of reset), every port should be disabled. 7926ee0b270SAlan Stern * Unconnected ports should likewise be disabled (paranoia), 7936ee0b270SAlan Stern * and so should ports for which we have no usb_device. 7945e6effaeSAlan Stern */ 7956ee0b270SAlan Stern if ((portstatus & USB_PORT_STAT_ENABLE) && ( 7966ee0b270SAlan Stern type != HUB_RESUME || 7976ee0b270SAlan Stern !(portstatus & USB_PORT_STAT_CONNECTION) || 7986ee0b270SAlan Stern !udev || 7996ee0b270SAlan Stern udev->state == USB_STATE_NOTATTACHED)) { 8009f0a6cd3SAndiry Xu /* 8019f0a6cd3SAndiry Xu * USB3 protocol ports will automatically transition 8029f0a6cd3SAndiry Xu * to Enabled state when detect an USB3.0 device attach. 8039f0a6cd3SAndiry Xu * Do not disable USB3 protocol ports. 8049f0a6cd3SAndiry Xu */ 805131dec34SSarah Sharp if (!hub_is_superspeed(hdev)) { 8069f0a6cd3SAndiry Xu clear_port_feature(hdev, port1, 8079f0a6cd3SAndiry Xu USB_PORT_FEAT_ENABLE); 8086ee0b270SAlan Stern portstatus &= ~USB_PORT_STAT_ENABLE; 80985f0ff46SSarah Sharp } else { 81085f0ff46SSarah Sharp /* Pretend that power was lost for USB3 devs */ 81185f0ff46SSarah Sharp portstatus &= ~USB_PORT_STAT_ENABLE; 8126ee0b270SAlan Stern } 8139f0a6cd3SAndiry Xu } 8146ee0b270SAlan Stern 815948fea37SAlan Stern /* Clear status-change flags; we'll debounce later */ 816948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) { 817948fea37SAlan Stern need_debounce_delay = true; 818948fea37SAlan Stern clear_port_feature(hub->hdev, port1, 819948fea37SAlan Stern USB_PORT_FEAT_C_CONNECTION); 820948fea37SAlan Stern } 821948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) { 822948fea37SAlan Stern need_debounce_delay = true; 823948fea37SAlan Stern clear_port_feature(hub->hdev, port1, 824948fea37SAlan Stern USB_PORT_FEAT_C_ENABLE); 825948fea37SAlan Stern } 826dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_LINK_STATE) { 827dbe79bbeSJohn Youn need_debounce_delay = true; 828dbe79bbeSJohn Youn clear_port_feature(hub->hdev, port1, 829dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_LINK_STATE); 830dbe79bbeSJohn Youn } 831948fea37SAlan Stern 83279c3dd81SDon Zickus if ((portchange & USB_PORT_STAT_C_BH_RESET) && 83379c3dd81SDon Zickus hub_is_superspeed(hub->hdev)) { 83479c3dd81SDon Zickus need_debounce_delay = true; 83579c3dd81SDon Zickus clear_port_feature(hub->hdev, port1, 83679c3dd81SDon Zickus USB_PORT_FEAT_C_BH_PORT_RESET); 83779c3dd81SDon Zickus } 838253e0572SAlan Stern /* We can forget about a "removed" device when there's a 839253e0572SAlan Stern * physical disconnect or the connect status changes. 840253e0572SAlan Stern */ 841253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 842253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 843253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 844253e0572SAlan Stern 8456ee0b270SAlan Stern if (!udev || udev->state == USB_STATE_NOTATTACHED) { 8466ee0b270SAlan Stern /* Tell khubd to disconnect the device or 8476ee0b270SAlan Stern * check for a new connection 8486ee0b270SAlan Stern */ 8496ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 8506ee0b270SAlan Stern set_bit(port1, hub->change_bits); 8516ee0b270SAlan Stern 8526ee0b270SAlan Stern } else if (portstatus & USB_PORT_STAT_ENABLE) { 8536ee0b270SAlan Stern /* The power session apparently survived the resume. 8546ee0b270SAlan Stern * If there was an overcurrent or suspend change 8556ee0b270SAlan Stern * (i.e., remote wakeup request), have khubd 8566ee0b270SAlan Stern * take care of it. 8576ee0b270SAlan Stern */ 8586ee0b270SAlan Stern if (portchange) 8596ee0b270SAlan Stern set_bit(port1, hub->change_bits); 8606ee0b270SAlan Stern 8616ee0b270SAlan Stern } else if (udev->persist_enabled) { 8626ee0b270SAlan Stern #ifdef CONFIG_PM 8635e6effaeSAlan Stern udev->reset_resume = 1; 8646ee0b270SAlan Stern #endif 8658808f00cSAlan Stern set_bit(port1, hub->change_bits); 8668808f00cSAlan Stern 8676ee0b270SAlan Stern } else { 8686ee0b270SAlan Stern /* The power session is gone; tell khubd */ 8696ee0b270SAlan Stern usb_set_device_state(udev, USB_STATE_NOTATTACHED); 8706ee0b270SAlan Stern set_bit(port1, hub->change_bits); 8715e6effaeSAlan Stern } 8725e6effaeSAlan Stern } 8735e6effaeSAlan Stern 874948fea37SAlan Stern /* If no port-status-change flags were set, we don't need any 875948fea37SAlan Stern * debouncing. If flags were set we can try to debounce the 876948fea37SAlan Stern * ports all at once right now, instead of letting khubd do them 877948fea37SAlan Stern * one at a time later on. 878948fea37SAlan Stern * 879948fea37SAlan Stern * If any port-status changes do occur during this delay, khubd 880948fea37SAlan Stern * will see them later and handle them normally. 881948fea37SAlan Stern */ 8828520f380SAlan Stern if (need_debounce_delay) { 8838520f380SAlan Stern delay = HUB_DEBOUNCE_STABLE; 884f2835219SAlan Stern 8858520f380SAlan Stern /* Don't do a long sleep inside a workqueue routine */ 8868520f380SAlan Stern if (type == HUB_INIT2) { 8878520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); 8888520f380SAlan Stern schedule_delayed_work(&hub->init_work, 8898520f380SAlan Stern msecs_to_jiffies(delay)); 8908520f380SAlan Stern return; /* Continues at init3: below */ 8918520f380SAlan Stern } else { 8928520f380SAlan Stern msleep(delay); 8938520f380SAlan Stern } 8948520f380SAlan Stern } 8958520f380SAlan Stern init3: 896f2835219SAlan Stern hub->quiescing = 0; 897f2835219SAlan Stern 898f2835219SAlan Stern status = usb_submit_urb(hub->urb, GFP_NOIO); 899f2835219SAlan Stern if (status < 0) 900f2835219SAlan Stern dev_err(hub->intfdev, "activate --> %d\n", status); 901f2835219SAlan Stern if (hub->has_indicators && blinkenlights) 902f2835219SAlan Stern schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 903f2835219SAlan Stern 904f2835219SAlan Stern /* Scan all ports that need attention */ 905f2835219SAlan Stern kick_khubd(hub); 9068e4ceb38SAlan Stern 9078e4ceb38SAlan Stern /* Allow autosuspend if it was suppressed */ 9088e4ceb38SAlan Stern if (type <= HUB_INIT3) 9098e4ceb38SAlan Stern usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); 9105e6effaeSAlan Stern } 9115e6effaeSAlan Stern 9128520f380SAlan Stern /* Implement the continuations for the delays above */ 9138520f380SAlan Stern static void hub_init_func2(struct work_struct *ws) 9148520f380SAlan Stern { 9158520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 9168520f380SAlan Stern 9178520f380SAlan Stern hub_activate(hub, HUB_INIT2); 9188520f380SAlan Stern } 9198520f380SAlan Stern 9208520f380SAlan Stern static void hub_init_func3(struct work_struct *ws) 9218520f380SAlan Stern { 9228520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 9238520f380SAlan Stern 9248520f380SAlan Stern hub_activate(hub, HUB_INIT3); 9258520f380SAlan Stern } 9268520f380SAlan Stern 9274330354fSAlan Stern enum hub_quiescing_type { 9284330354fSAlan Stern HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND 9294330354fSAlan Stern }; 9304330354fSAlan Stern 9314330354fSAlan Stern static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) 9324330354fSAlan Stern { 9334330354fSAlan Stern struct usb_device *hdev = hub->hdev; 9344330354fSAlan Stern int i; 9354330354fSAlan Stern 9368520f380SAlan Stern cancel_delayed_work_sync(&hub->init_work); 9378520f380SAlan Stern 9384330354fSAlan Stern /* khubd and related activity won't re-trigger */ 9394330354fSAlan Stern hub->quiescing = 1; 9404330354fSAlan Stern 9414330354fSAlan Stern if (type != HUB_SUSPEND) { 9424330354fSAlan Stern /* Disconnect all the children */ 9434330354fSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 9444330354fSAlan Stern if (hdev->children[i]) 9454330354fSAlan Stern usb_disconnect(&hdev->children[i]); 9464330354fSAlan Stern } 9474330354fSAlan Stern } 9484330354fSAlan Stern 9494330354fSAlan Stern /* Stop khubd and related activity */ 9504330354fSAlan Stern usb_kill_urb(hub->urb); 9514330354fSAlan Stern if (hub->has_indicators) 9524330354fSAlan Stern cancel_delayed_work_sync(&hub->leds); 9534330354fSAlan Stern if (hub->tt.hub) 954cb88a1b8SAlan Stern cancel_work_sync(&hub->tt.clear_work); 9554330354fSAlan Stern } 9564330354fSAlan Stern 9573eb14915SAlan Stern /* caller has locked the hub device */ 9583eb14915SAlan Stern static int hub_pre_reset(struct usb_interface *intf) 9593eb14915SAlan Stern { 9603eb14915SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 9613eb14915SAlan Stern 9624330354fSAlan Stern hub_quiesce(hub, HUB_PRE_RESET); 963f07600cfSAlan Stern return 0; 9647d069b7dSAlan Stern } 9657d069b7dSAlan Stern 9667d069b7dSAlan Stern /* caller has locked the hub device */ 967f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 9687d069b7dSAlan Stern { 9697de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 9707de18d8bSAlan Stern 971f2835219SAlan Stern hub_activate(hub, HUB_POST_RESET); 972f07600cfSAlan Stern return 0; 9737d069b7dSAlan Stern } 9747d069b7dSAlan Stern 9751da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 9761da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 9771da177e4SLinus Torvalds { 978b356b7c7SSarah Sharp struct usb_hcd *hcd; 9791da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 9801da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 9811da177e4SLinus Torvalds u16 hubstatus, hubchange; 98274ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 9831da177e4SLinus Torvalds unsigned int pipe; 9841da177e4SLinus Torvalds int maxp, ret; 9857cbe5dcaSAlan Stern char *message = "out of memory"; 9861da177e4SLinus Torvalds 987d697cddaSAlan Stern hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); 9881da177e4SLinus Torvalds if (!hub->buffer) { 9891da177e4SLinus Torvalds ret = -ENOMEM; 9901da177e4SLinus Torvalds goto fail; 9911da177e4SLinus Torvalds } 9921da177e4SLinus Torvalds 9931da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 9941da177e4SLinus Torvalds if (!hub->status) { 9951da177e4SLinus Torvalds ret = -ENOMEM; 9961da177e4SLinus Torvalds goto fail; 9971da177e4SLinus Torvalds } 998db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 9991da177e4SLinus Torvalds 10001da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 10011da177e4SLinus Torvalds if (!hub->descriptor) { 10021da177e4SLinus Torvalds ret = -ENOMEM; 10031da177e4SLinus Torvalds goto fail; 10041da177e4SLinus Torvalds } 10051da177e4SLinus Torvalds 10061da177e4SLinus Torvalds /* Request the entire hub descriptor. 10071da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 10081da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 10091da177e4SLinus Torvalds */ 1010dbe79bbeSJohn Youn ret = get_hub_descriptor(hdev, hub->descriptor); 10111da177e4SLinus Torvalds if (ret < 0) { 10121da177e4SLinus Torvalds message = "can't read hub descriptor"; 10131da177e4SLinus Torvalds goto fail; 10141da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 10151da177e4SLinus Torvalds message = "hub has too many ports!"; 10161da177e4SLinus Torvalds ret = -ENODEV; 10171da177e4SLinus Torvalds goto fail; 10181da177e4SLinus Torvalds } 10191da177e4SLinus Torvalds 10201da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 10211da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 10221da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 10231da177e4SLinus Torvalds 10247cbe5dcaSAlan Stern hub->port_owners = kzalloc(hdev->maxchild * sizeof(void *), GFP_KERNEL); 10257cbe5dcaSAlan Stern if (!hub->port_owners) { 10267cbe5dcaSAlan Stern ret = -ENOMEM; 10277cbe5dcaSAlan Stern goto fail; 10287cbe5dcaSAlan Stern } 10297cbe5dcaSAlan Stern 103074ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 10311da177e4SLinus Torvalds 1032dbe79bbeSJohn Youn /* FIXME for USB 3.0, skip for now */ 1033dbe79bbeSJohn Youn if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && 1034dbe79bbeSJohn Youn !(hub_is_superspeed(hdev))) { 10351da177e4SLinus Torvalds int i; 10361da177e4SLinus Torvalds char portstr [USB_MAXCHILDREN + 1]; 10371da177e4SLinus Torvalds 10381da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 1039dbe79bbeSJohn Youn portstr[i] = hub->descriptor->u.hs.DeviceRemovable 10401da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 10411da177e4SLinus Torvalds ? 'F' : 'R'; 10421da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 10431da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 10441da177e4SLinus Torvalds } else 10451da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 10461da177e4SLinus Torvalds 104774ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 10487bf01185SAman Deep case HUB_CHAR_COMMON_LPSM: 10491da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 10501da177e4SLinus Torvalds break; 10517bf01185SAman Deep case HUB_CHAR_INDV_PORT_LPSM: 10521da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 10531da177e4SLinus Torvalds break; 10547bf01185SAman Deep case HUB_CHAR_NO_LPSM: 10557bf01185SAman Deep case HUB_CHAR_LPSM: 10561da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 10571da177e4SLinus Torvalds break; 10581da177e4SLinus Torvalds } 10591da177e4SLinus Torvalds 106074ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 10617bf01185SAman Deep case HUB_CHAR_COMMON_OCPM: 10621da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 10631da177e4SLinus Torvalds break; 10647bf01185SAman Deep case HUB_CHAR_INDV_PORT_OCPM: 10651da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 10661da177e4SLinus Torvalds break; 10677bf01185SAman Deep case HUB_CHAR_NO_OCPM: 10687bf01185SAman Deep case HUB_CHAR_OCPM: 10691da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 10701da177e4SLinus Torvalds break; 10711da177e4SLinus Torvalds } 10721da177e4SLinus Torvalds 10731da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 10741da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 1075cb88a1b8SAlan Stern INIT_WORK(&hub->tt.clear_work, hub_tt_work); 10761da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 10777bf01185SAman Deep case USB_HUB_PR_FS: 10781da177e4SLinus Torvalds break; 10797bf01185SAman Deep case USB_HUB_PR_HS_SINGLE_TT: 10801da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 10811da177e4SLinus Torvalds hub->tt.hub = hdev; 10821da177e4SLinus Torvalds break; 10837bf01185SAman Deep case USB_HUB_PR_HS_MULTI_TT: 10841da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 10851da177e4SLinus Torvalds if (ret == 0) { 10861da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 10871da177e4SLinus Torvalds hub->tt.multi = 1; 10881da177e4SLinus Torvalds } else 10891da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 10901da177e4SLinus Torvalds ret); 10911da177e4SLinus Torvalds hub->tt.hub = hdev; 10921da177e4SLinus Torvalds break; 10937bf01185SAman Deep case USB_HUB_PR_SS: 1094d2e9b4d6SSarah Sharp /* USB 3.0 hubs don't have a TT */ 1095d2e9b4d6SSarah Sharp break; 10961da177e4SLinus Torvalds default: 10971da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 10981da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 10991da177e4SLinus Torvalds break; 11001da177e4SLinus Torvalds } 11011da177e4SLinus Torvalds 1102e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 110374ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 1104e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 1105e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 1106e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 1107e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1108e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1109e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 1110e09711aeSdavid-b@pacbell.net } 11111da177e4SLinus Torvalds break; 1112e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 1113e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 1114e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1115e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1116e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 11171da177e4SLinus Torvalds break; 1118e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 1119e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 1120e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1121e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1122e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 11231da177e4SLinus Torvalds break; 1124e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 1125e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 1126e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1127e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1128e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 11291da177e4SLinus Torvalds break; 11301da177e4SLinus Torvalds } 11311da177e4SLinus Torvalds 11321da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 113374ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 11341da177e4SLinus Torvalds hub->has_indicators = 1; 11351da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 11361da177e4SLinus Torvalds } 11371da177e4SLinus Torvalds 11381da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 11391da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 11401da177e4SLinus Torvalds 11411da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 11421da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 11431da177e4SLinus Torvalds */ 11441da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 114555c52718SAlan Stern if (ret < 2) { 11461da177e4SLinus Torvalds message = "can't get hub status"; 11471da177e4SLinus Torvalds goto fail; 11481da177e4SLinus Torvalds } 11497d35b929SAlan Stern le16_to_cpus(&hubstatus); 11507d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 115155c52718SAlan Stern if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) 115255c52718SAlan Stern hub->mA_per_port = 500; 115355c52718SAlan Stern else { 115455c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 115555c52718SAlan Stern hub->limited_power = 1; 115655c52718SAlan Stern } 11577d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 11581da177e4SLinus Torvalds dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 11591da177e4SLinus Torvalds hub->descriptor->bHubContrCurrent); 116055c52718SAlan Stern hub->limited_power = 1; 116155c52718SAlan Stern if (hdev->maxchild > 0) { 116255c52718SAlan Stern int remaining = hdev->bus_mA - 116355c52718SAlan Stern hub->descriptor->bHubContrCurrent; 11641da177e4SLinus Torvalds 116555c52718SAlan Stern if (remaining < hdev->maxchild * 100) 116655c52718SAlan Stern dev_warn(hub_dev, 116755c52718SAlan Stern "insufficient power available " 116855c52718SAlan Stern "to use all downstream ports\n"); 116955c52718SAlan Stern hub->mA_per_port = 100; /* 7.2.1.1 */ 117055c52718SAlan Stern } 117155c52718SAlan Stern } else { /* Self-powered external hub */ 117255c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 117355c52718SAlan Stern * provide less current per port? */ 117455c52718SAlan Stern hub->mA_per_port = 500; 117555c52718SAlan Stern } 117655c52718SAlan Stern if (hub->mA_per_port < 500) 117755c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 117855c52718SAlan Stern hub->mA_per_port); 11791da177e4SLinus Torvalds 1180b356b7c7SSarah Sharp /* Update the HCD's internal representation of this hub before khubd 1181b356b7c7SSarah Sharp * starts getting port status changes for devices under the hub. 1182b356b7c7SSarah Sharp */ 1183b356b7c7SSarah Sharp hcd = bus_to_hcd(hdev->bus); 1184b356b7c7SSarah Sharp if (hcd->driver->update_hub_device) { 1185b356b7c7SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1186b356b7c7SSarah Sharp &hub->tt, GFP_KERNEL); 1187b356b7c7SSarah Sharp if (ret < 0) { 1188b356b7c7SSarah Sharp message = "can't update HCD hub info"; 1189b356b7c7SSarah Sharp goto fail; 1190b356b7c7SSarah Sharp } 1191b356b7c7SSarah Sharp } 1192b356b7c7SSarah Sharp 11931da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 11941da177e4SLinus Torvalds if (ret < 0) { 11951da177e4SLinus Torvalds message = "can't get hub status"; 11961da177e4SLinus Torvalds goto fail; 11971da177e4SLinus Torvalds } 11981da177e4SLinus Torvalds 11991da177e4SLinus Torvalds /* local power status reports aren't always correct */ 12001da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 12011da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 12021da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 12031da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 12041da177e4SLinus Torvalds 120574ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 12061da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 12071da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 12081da177e4SLinus Torvalds 120988fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 121088fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 121188fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 121288fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 121388fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 121488fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 12151da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 12161da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 12171da177e4SLinus Torvalds 12181da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 12191da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 12201da177e4SLinus Torvalds 12211da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 12221da177e4SLinus Torvalds if (!hub->urb) { 12231da177e4SLinus Torvalds ret = -ENOMEM; 12241da177e4SLinus Torvalds goto fail; 12251da177e4SLinus Torvalds } 12261da177e4SLinus Torvalds 12271da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 12281da177e4SLinus Torvalds hub, endpoint->bInterval); 12291da177e4SLinus Torvalds 12301da177e4SLinus Torvalds /* maybe cycle the hub leds */ 12311da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 12321da177e4SLinus Torvalds hub->indicator [0] = INDICATOR_CYCLE; 12331da177e4SLinus Torvalds 1234f2835219SAlan Stern hub_activate(hub, HUB_INIT); 12351da177e4SLinus Torvalds return 0; 12361da177e4SLinus Torvalds 12371da177e4SLinus Torvalds fail: 12381da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 12391da177e4SLinus Torvalds message, ret); 12401da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 12411da177e4SLinus Torvalds return ret; 12421da177e4SLinus Torvalds } 12431da177e4SLinus Torvalds 1244e8054854SAlan Stern static void hub_release(struct kref *kref) 1245e8054854SAlan Stern { 1246e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 1247e8054854SAlan Stern 1248e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 1249e8054854SAlan Stern kfree(hub); 1250e8054854SAlan Stern } 1251e8054854SAlan Stern 12521da177e4SLinus Torvalds static unsigned highspeed_hubs; 12531da177e4SLinus Torvalds 12541da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 12551da177e4SLinus Torvalds { 12561da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 1257e8054854SAlan Stern 1258e8054854SAlan Stern /* Take the hub off the event list and don't let it be added again */ 1259e8054854SAlan Stern spin_lock_irq(&hub_event_lock); 12608e4ceb38SAlan Stern if (!list_empty(&hub->event_list)) { 1261e8054854SAlan Stern list_del_init(&hub->event_list); 12628e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 12638e4ceb38SAlan Stern } 1264e8054854SAlan Stern hub->disconnected = 1; 1265e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 12661da177e4SLinus Torvalds 12677de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 12687de18d8bSAlan Stern hub->error = 0; 12694330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 12707de18d8bSAlan Stern 12718b28c752SAlan Stern usb_set_intfdata (intf, NULL); 12727cbe5dcaSAlan Stern hub->hdev->maxchild = 0; 12731da177e4SLinus Torvalds 1274e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 12751da177e4SLinus Torvalds highspeed_hubs--; 12761da177e4SLinus Torvalds 12771da177e4SLinus Torvalds usb_free_urb(hub->urb); 12787cbe5dcaSAlan Stern kfree(hub->port_owners); 12791da177e4SLinus Torvalds kfree(hub->descriptor); 12801da177e4SLinus Torvalds kfree(hub->status); 1281d697cddaSAlan Stern kfree(hub->buffer); 12821da177e4SLinus Torvalds 1283e8054854SAlan Stern kref_put(&hub->kref, hub_release); 12841da177e4SLinus Torvalds } 12851da177e4SLinus Torvalds 12861da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 12871da177e4SLinus Torvalds { 12881da177e4SLinus Torvalds struct usb_host_interface *desc; 12891da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 12901da177e4SLinus Torvalds struct usb_device *hdev; 12911da177e4SLinus Torvalds struct usb_hub *hub; 12921da177e4SLinus Torvalds 12931da177e4SLinus Torvalds desc = intf->cur_altsetting; 12941da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 12951da177e4SLinus Torvalds 12960c9ffe0fSSarah Sharp /* Hubs have proper suspend/resume support. USB 3.0 device suspend is 12970c9ffe0fSSarah Sharp * different from USB 2.0/1.1 device suspend, and unfortunately we 12980c9ffe0fSSarah Sharp * don't support it yet. So leave autosuspend disabled for USB 3.0 12990c9ffe0fSSarah Sharp * external hubs for now. Enable autosuspend for USB 3.0 roothubs, 13000c9ffe0fSSarah Sharp * since that isn't a "real" hub. 13010c9ffe0fSSarah Sharp */ 13020c9ffe0fSSarah Sharp if (!hub_is_superspeed(hdev) || !hdev->parent) 1303088f7fecSAlan Stern usb_enable_autosuspend(hdev); 1304088f7fecSAlan Stern 130538f3ad5eSFelipe Balbi if (hdev->level == MAX_TOPO_LEVEL) { 1306b9cef6c3SWu Fengguang dev_err(&intf->dev, 1307b9cef6c3SWu Fengguang "Unsupported bus topology: hub nested too deep\n"); 130838f3ad5eSFelipe Balbi return -E2BIG; 130938f3ad5eSFelipe Balbi } 131038f3ad5eSFelipe Balbi 131189ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 131289ccbdc9SDavid Brownell if (hdev->parent) { 131389ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 131489ccbdc9SDavid Brownell return -ENODEV; 131589ccbdc9SDavid Brownell } 131689ccbdc9SDavid Brownell #endif 131789ccbdc9SDavid Brownell 13181da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 13191da177e4SLinus Torvalds /* specs is not defined, but it works */ 13201da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 13211da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 13221da177e4SLinus Torvalds descriptor_error: 13231da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 13241da177e4SLinus Torvalds return -EIO; 13251da177e4SLinus Torvalds } 13261da177e4SLinus Torvalds 13271da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 13281da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 13291da177e4SLinus Torvalds goto descriptor_error; 13301da177e4SLinus Torvalds 13311da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 13321da177e4SLinus Torvalds 1333fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 1334fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 13351da177e4SLinus Torvalds goto descriptor_error; 13361da177e4SLinus Torvalds 13371da177e4SLinus Torvalds /* We found a hub */ 13381da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 13391da177e4SLinus Torvalds 13400a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 13411da177e4SLinus Torvalds if (!hub) { 13421da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 13431da177e4SLinus Torvalds return -ENOMEM; 13441da177e4SLinus Torvalds } 13451da177e4SLinus Torvalds 1346e8054854SAlan Stern kref_init(&hub->kref); 13471da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 13481da177e4SLinus Torvalds hub->intfdev = &intf->dev; 13491da177e4SLinus Torvalds hub->hdev = hdev; 1350c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 13518520f380SAlan Stern INIT_DELAYED_WORK(&hub->init_work, NULL); 1352e8054854SAlan Stern usb_get_intf(intf); 13531da177e4SLinus Torvalds 13541da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 135540f122f3SAlan Stern intf->needs_remote_wakeup = 1; 13561da177e4SLinus Torvalds 13571da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 13581da177e4SLinus Torvalds highspeed_hubs++; 13591da177e4SLinus Torvalds 13601da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 13611da177e4SLinus Torvalds return 0; 13621da177e4SLinus Torvalds 13631da177e4SLinus Torvalds hub_disconnect (intf); 13641da177e4SLinus Torvalds return -ENODEV; 13651da177e4SLinus Torvalds } 13661da177e4SLinus Torvalds 13671da177e4SLinus Torvalds static int 13681da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 13691da177e4SLinus Torvalds { 13701da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 13711da177e4SLinus Torvalds 13721da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 13731da177e4SLinus Torvalds switch (code) { 13741da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 13751da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 13761da177e4SLinus Torvalds int i; 13771da177e4SLinus Torvalds 13781da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 13791da177e4SLinus Torvalds if (hdev->devnum <= 0) 13801da177e4SLinus Torvalds info->nports = 0; 13811da177e4SLinus Torvalds else { 13821da177e4SLinus Torvalds info->nports = hdev->maxchild; 13831da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 13841da177e4SLinus Torvalds if (hdev->children[i] == NULL) 13851da177e4SLinus Torvalds info->port[i] = 0; 13861da177e4SLinus Torvalds else 13871da177e4SLinus Torvalds info->port[i] = 13881da177e4SLinus Torvalds hdev->children[i]->devnum; 13891da177e4SLinus Torvalds } 13901da177e4SLinus Torvalds } 13911da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 13921da177e4SLinus Torvalds 13931da177e4SLinus Torvalds return info->nports + 1; 13941da177e4SLinus Torvalds } 13951da177e4SLinus Torvalds 13961da177e4SLinus Torvalds default: 13971da177e4SLinus Torvalds return -ENOSYS; 13981da177e4SLinus Torvalds } 13991da177e4SLinus Torvalds } 14001da177e4SLinus Torvalds 14017cbe5dcaSAlan Stern /* 14027cbe5dcaSAlan Stern * Allow user programs to claim ports on a hub. When a device is attached 14037cbe5dcaSAlan Stern * to one of these "claimed" ports, the program will "own" the device. 14047cbe5dcaSAlan Stern */ 14057cbe5dcaSAlan Stern static int find_port_owner(struct usb_device *hdev, unsigned port1, 14067cbe5dcaSAlan Stern void ***ppowner) 14077cbe5dcaSAlan Stern { 14087cbe5dcaSAlan Stern if (hdev->state == USB_STATE_NOTATTACHED) 14097cbe5dcaSAlan Stern return -ENODEV; 14107cbe5dcaSAlan Stern if (port1 == 0 || port1 > hdev->maxchild) 14117cbe5dcaSAlan Stern return -EINVAL; 14127cbe5dcaSAlan Stern 14137cbe5dcaSAlan Stern /* This assumes that devices not managed by the hub driver 14147cbe5dcaSAlan Stern * will always have maxchild equal to 0. 14157cbe5dcaSAlan Stern */ 14167cbe5dcaSAlan Stern *ppowner = &(hdev_to_hub(hdev)->port_owners[port1 - 1]); 14177cbe5dcaSAlan Stern return 0; 14187cbe5dcaSAlan Stern } 14197cbe5dcaSAlan Stern 14207cbe5dcaSAlan Stern /* In the following three functions, the caller must hold hdev's lock */ 14217cbe5dcaSAlan Stern int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, void *owner) 14227cbe5dcaSAlan Stern { 14237cbe5dcaSAlan Stern int rc; 14247cbe5dcaSAlan Stern void **powner; 14257cbe5dcaSAlan Stern 14267cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 14277cbe5dcaSAlan Stern if (rc) 14287cbe5dcaSAlan Stern return rc; 14297cbe5dcaSAlan Stern if (*powner) 14307cbe5dcaSAlan Stern return -EBUSY; 14317cbe5dcaSAlan Stern *powner = owner; 14327cbe5dcaSAlan Stern return rc; 14337cbe5dcaSAlan Stern } 14347cbe5dcaSAlan Stern 14357cbe5dcaSAlan Stern int usb_hub_release_port(struct usb_device *hdev, unsigned port1, void *owner) 14367cbe5dcaSAlan Stern { 14377cbe5dcaSAlan Stern int rc; 14387cbe5dcaSAlan Stern void **powner; 14397cbe5dcaSAlan Stern 14407cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 14417cbe5dcaSAlan Stern if (rc) 14427cbe5dcaSAlan Stern return rc; 14437cbe5dcaSAlan Stern if (*powner != owner) 14447cbe5dcaSAlan Stern return -ENOENT; 14457cbe5dcaSAlan Stern *powner = NULL; 14467cbe5dcaSAlan Stern return rc; 14477cbe5dcaSAlan Stern } 14487cbe5dcaSAlan Stern 14497cbe5dcaSAlan Stern void usb_hub_release_all_ports(struct usb_device *hdev, void *owner) 14507cbe5dcaSAlan Stern { 14517cbe5dcaSAlan Stern int n; 14527cbe5dcaSAlan Stern void **powner; 14537cbe5dcaSAlan Stern 14547cbe5dcaSAlan Stern n = find_port_owner(hdev, 1, &powner); 14557cbe5dcaSAlan Stern if (n == 0) { 14567cbe5dcaSAlan Stern for (; n < hdev->maxchild; (++n, ++powner)) { 14577cbe5dcaSAlan Stern if (*powner == owner) 14587cbe5dcaSAlan Stern *powner = NULL; 14597cbe5dcaSAlan Stern } 14607cbe5dcaSAlan Stern } 14617cbe5dcaSAlan Stern } 14627cbe5dcaSAlan Stern 14637cbe5dcaSAlan Stern /* The caller must hold udev's lock */ 14647cbe5dcaSAlan Stern bool usb_device_is_owned(struct usb_device *udev) 14657cbe5dcaSAlan Stern { 14667cbe5dcaSAlan Stern struct usb_hub *hub; 14677cbe5dcaSAlan Stern 14687cbe5dcaSAlan Stern if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) 14697cbe5dcaSAlan Stern return false; 14707cbe5dcaSAlan Stern hub = hdev_to_hub(udev->parent); 14717cbe5dcaSAlan Stern return !!hub->port_owners[udev->portnum - 1]; 14727cbe5dcaSAlan Stern } 14737cbe5dcaSAlan Stern 14741da177e4SLinus Torvalds 14751da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 14761da177e4SLinus Torvalds { 14771da177e4SLinus Torvalds int i; 14781da177e4SLinus Torvalds 14791da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 14801da177e4SLinus Torvalds if (udev->children[i]) 14811da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev->children[i]); 14821da177e4SLinus Torvalds } 14839bbdf1e0SAlan Stern if (udev->state == USB_STATE_SUSPENDED) 148415123006SSarah Sharp udev->active_duration -= jiffies; 14851da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 14861da177e4SLinus Torvalds } 14871da177e4SLinus Torvalds 14881da177e4SLinus Torvalds /** 14891da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 14901da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 14911da177e4SLinus Torvalds * @new_state: new state value to be stored 14921da177e4SLinus Torvalds * 14931da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 14941da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 14951da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 14961da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 14971da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 14981da177e4SLinus Torvalds * all changes to any device's state must be protected by the 14991da177e4SLinus Torvalds * device_state_lock spinlock. 15001da177e4SLinus Torvalds * 15011da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 15021da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 15031da177e4SLinus Torvalds * 15041da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 15051da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 15061da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 15071da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 15081da177e4SLinus Torvalds */ 15091da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 15101da177e4SLinus Torvalds enum usb_device_state new_state) 15111da177e4SLinus Torvalds { 15121da177e4SLinus Torvalds unsigned long flags; 15134681b171SRafael J. Wysocki int wakeup = -1; 15141da177e4SLinus Torvalds 15151da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 15161da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 15171da177e4SLinus Torvalds ; /* do nothing */ 1518b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1519fb669cc0SDavid Brownell 1520fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1521fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1522fb669cc0SDavid Brownell */ 1523fb669cc0SDavid Brownell if (udev->parent) { 1524645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1525645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1526645daaabSAlan Stern ; /* No change to wakeup settings */ 1527645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 15284681b171SRafael J. Wysocki wakeup = udev->actconfig->desc.bmAttributes 15294681b171SRafael J. Wysocki & USB_CONFIG_ATT_WAKEUP; 1530645daaabSAlan Stern else 15314681b171SRafael J. Wysocki wakeup = 0; 1532fb669cc0SDavid Brownell } 153315123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED && 153415123006SSarah Sharp new_state != USB_STATE_SUSPENDED) 153515123006SSarah Sharp udev->active_duration -= jiffies; 153615123006SSarah Sharp else if (new_state == USB_STATE_SUSPENDED && 153715123006SSarah Sharp udev->state != USB_STATE_SUSPENDED) 153815123006SSarah Sharp udev->active_duration += jiffies; 1539645daaabSAlan Stern udev->state = new_state; 1540b94dc6b5SDavid Brownell } else 15411da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 15421da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 15434681b171SRafael J. Wysocki if (wakeup >= 0) 15444681b171SRafael J. Wysocki device_set_wakeup_capable(&udev->dev, wakeup); 15451da177e4SLinus Torvalds } 15466da9c990SDavid Vrabel EXPORT_SYMBOL_GPL(usb_set_device_state); 15471da177e4SLinus Torvalds 15488af548dcSInaky Perez-Gonzalez /* 15493b29b68bSAlan Stern * Choose a device number. 15503b29b68bSAlan Stern * 15513b29b68bSAlan Stern * Device numbers are used as filenames in usbfs. On USB-1.1 and 15523b29b68bSAlan Stern * USB-2.0 buses they are also used as device addresses, however on 15533b29b68bSAlan Stern * USB-3.0 buses the address is assigned by the controller hardware 15543b29b68bSAlan Stern * and it usually is not the same as the device number. 15553b29b68bSAlan Stern * 15568af548dcSInaky Perez-Gonzalez * WUSB devices are simple: they have no hubs behind, so the mapping 15578af548dcSInaky Perez-Gonzalez * device <-> virtual port number becomes 1:1. Why? to simplify the 15588af548dcSInaky Perez-Gonzalez * life of the device connection logic in 15598af548dcSInaky Perez-Gonzalez * drivers/usb/wusbcore/devconnect.c. When we do the initial secret 15608af548dcSInaky Perez-Gonzalez * handshake we need to assign a temporary address in the unauthorized 15618af548dcSInaky Perez-Gonzalez * space. For simplicity we use the first virtual port number found to 15628af548dcSInaky Perez-Gonzalez * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] 15638af548dcSInaky Perez-Gonzalez * and that becomes it's address [X < 128] or its unauthorized address 15648af548dcSInaky Perez-Gonzalez * [X | 0x80]. 15658af548dcSInaky Perez-Gonzalez * 15668af548dcSInaky Perez-Gonzalez * We add 1 as an offset to the one-based USB-stack port number 15678af548dcSInaky Perez-Gonzalez * (zero-based wusb virtual port index) for two reasons: (a) dev addr 15688af548dcSInaky Perez-Gonzalez * 0 is reserved by USB for default address; (b) Linux's USB stack 15698af548dcSInaky Perez-Gonzalez * uses always #1 for the root hub of the controller. So USB stack's 15708af548dcSInaky Perez-Gonzalez * port #1, which is wusb virtual-port #0 has address #2. 1571c6515272SSarah Sharp * 1572c6515272SSarah Sharp * Devices connected under xHCI are not as simple. The host controller 1573c6515272SSarah Sharp * supports virtualization, so the hardware assigns device addresses and 1574c6515272SSarah Sharp * the HCD must setup data structures before issuing a set address 1575c6515272SSarah Sharp * command to the hardware. 15768af548dcSInaky Perez-Gonzalez */ 15773b29b68bSAlan Stern static void choose_devnum(struct usb_device *udev) 15781da177e4SLinus Torvalds { 15791da177e4SLinus Torvalds int devnum; 15801da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 15811da177e4SLinus Torvalds 15821da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 15838af548dcSInaky Perez-Gonzalez if (udev->wusb) { 15848af548dcSInaky Perez-Gonzalez devnum = udev->portnum + 1; 15858af548dcSInaky Perez-Gonzalez BUG_ON(test_bit(devnum, bus->devmap.devicemap)); 15868af548dcSInaky Perez-Gonzalez } else { 15878af548dcSInaky Perez-Gonzalez /* Try to allocate the next devnum beginning at 15888af548dcSInaky Perez-Gonzalez * bus->devnum_next. */ 15891da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 15901da177e4SLinus Torvalds bus->devnum_next); 15911da177e4SLinus Torvalds if (devnum >= 128) 15928af548dcSInaky Perez-Gonzalez devnum = find_next_zero_bit(bus->devmap.devicemap, 15938af548dcSInaky Perez-Gonzalez 128, 1); 15941da177e4SLinus Torvalds bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); 15958af548dcSInaky Perez-Gonzalez } 15961da177e4SLinus Torvalds if (devnum < 128) { 15971da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 15981da177e4SLinus Torvalds udev->devnum = devnum; 15991da177e4SLinus Torvalds } 16001da177e4SLinus Torvalds } 16011da177e4SLinus Torvalds 16023b29b68bSAlan Stern static void release_devnum(struct usb_device *udev) 16031da177e4SLinus Torvalds { 16041da177e4SLinus Torvalds if (udev->devnum > 0) { 16051da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 16061da177e4SLinus Torvalds udev->devnum = -1; 16071da177e4SLinus Torvalds } 16081da177e4SLinus Torvalds } 16091da177e4SLinus Torvalds 16103b29b68bSAlan Stern static void update_devnum(struct usb_device *udev, int devnum) 16114953d141SDavid Vrabel { 16124953d141SDavid Vrabel /* The address for a WUSB device is managed by wusbcore. */ 16134953d141SDavid Vrabel if (!udev->wusb) 16144953d141SDavid Vrabel udev->devnum = devnum; 16154953d141SDavid Vrabel } 16164953d141SDavid Vrabel 1617f7410cedSHerbert Xu static void hub_free_dev(struct usb_device *udev) 1618f7410cedSHerbert Xu { 1619f7410cedSHerbert Xu struct usb_hcd *hcd = bus_to_hcd(udev->bus); 1620f7410cedSHerbert Xu 1621f7410cedSHerbert Xu /* Root hubs aren't real devices, so don't free HCD resources */ 1622f7410cedSHerbert Xu if (hcd->driver->free_dev && udev->parent) 1623f7410cedSHerbert Xu hcd->driver->free_dev(hcd, udev); 1624f7410cedSHerbert Xu } 1625f7410cedSHerbert Xu 16261da177e4SLinus Torvalds /** 16271da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 16281da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 16291da177e4SLinus Torvalds * Context: !in_interrupt () 16301da177e4SLinus Torvalds * 16311da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 16321da177e4SLinus Torvalds * 16331da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 16341da177e4SLinus Torvalds * If *pdev is a root hub then this routine will acquire the 16351da177e4SLinus Torvalds * usb_bus_list_lock on behalf of the caller. 16361da177e4SLinus Torvalds * 16371da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 16381da177e4SLinus Torvalds * controllers) should ever call this. 16391da177e4SLinus Torvalds * 16401da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 16411da177e4SLinus Torvalds */ 16421da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 16431da177e4SLinus Torvalds { 16441da177e4SLinus Torvalds struct usb_device *udev = *pdev; 16451da177e4SLinus Torvalds int i; 1646fccf4e86SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 16471da177e4SLinus Torvalds 16481da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 16491da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 165025985edcSLucas De Marchi * this quiesces everything except pending urbs. 16511da177e4SLinus Torvalds */ 16521da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 16533b29b68bSAlan Stern dev_info(&udev->dev, "USB disconnect, device number %d\n", 16543b29b68bSAlan Stern udev->devnum); 16551da177e4SLinus Torvalds 16569ad3d6ccSAlan Stern usb_lock_device(udev); 16579ad3d6ccSAlan Stern 16581da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 16591da177e4SLinus Torvalds for (i = 0; i < USB_MAXCHILDREN; i++) { 16601da177e4SLinus Torvalds if (udev->children[i]) 16611da177e4SLinus Torvalds usb_disconnect(&udev->children[i]); 16621da177e4SLinus Torvalds } 16631da177e4SLinus Torvalds 16641da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 16651da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 16661da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 16671da177e4SLinus Torvalds */ 1668782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 1669fccf4e86SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 16701da177e4SLinus Torvalds usb_disable_device(udev, 0); 1671fccf4e86SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 1672cde217a5SAlan Stern usb_hcd_synchronize_unlinks(udev); 16731da177e4SLinus Torvalds 16743b23dd6fSAlan Stern usb_remove_ep_devs(&udev->ep0); 1675782da727SAlan Stern usb_unlock_device(udev); 16763099e75aSGreg Kroah-Hartman 1677782da727SAlan Stern /* Unregister the device. The device driver is responsible 16783b23dd6fSAlan Stern * for de-configuring the device and invoking the remove-device 16793b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 1680782da727SAlan Stern */ 1681782da727SAlan Stern device_del(&udev->dev); 1682782da727SAlan Stern 1683782da727SAlan Stern /* Free the device number and delete the parent's children[] 16841da177e4SLinus Torvalds * (or root_hub) pointer. 16851da177e4SLinus Torvalds */ 16863b29b68bSAlan Stern release_devnum(udev); 16871da177e4SLinus Torvalds 16881da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 16891da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 16901da177e4SLinus Torvalds *pdev = NULL; 16911da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 16921da177e4SLinus Torvalds 1693f7410cedSHerbert Xu hub_free_dev(udev); 1694f7410cedSHerbert Xu 1695782da727SAlan Stern put_device(&udev->dev); 16961da177e4SLinus Torvalds } 16971da177e4SLinus Torvalds 1698f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 16991da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 17001da177e4SLinus Torvalds { 17011da177e4SLinus Torvalds if (!string) 17021da177e4SLinus Torvalds return; 17031da177e4SLinus Torvalds dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); 17041da177e4SLinus Torvalds } 17051da177e4SLinus Torvalds 1706f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 1707f2a383e4SGreg Kroah-Hartman { 1708f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", 1709f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 1710f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idProduct)); 1711b9cef6c3SWu Fengguang dev_info(&udev->dev, 1712b9cef6c3SWu Fengguang "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", 1713f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 1714f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 1715f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 1716f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 1717f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 1718f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 1719f2a383e4SGreg Kroah-Hartman } 17201da177e4SLinus Torvalds #else 1721f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 17221da177e4SLinus Torvalds #endif 17231da177e4SLinus Torvalds 17241da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 17251da177e4SLinus Torvalds #include "otg_whitelist.h" 17261da177e4SLinus Torvalds #endif 17271da177e4SLinus Torvalds 17283ede760fSOliver Neukum /** 17298d8558d1SAlan Stern * usb_enumerate_device_otg - FIXME (usbcore-internal) 17303ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 17313ede760fSOliver Neukum * 17328d8558d1SAlan Stern * Finish enumeration for On-The-Go devices 17333ede760fSOliver Neukum */ 17348d8558d1SAlan Stern static int usb_enumerate_device_otg(struct usb_device *udev) 17351da177e4SLinus Torvalds { 1736d9d16e8aSInaky Perez-Gonzalez int err = 0; 17371da177e4SLinus Torvalds 17381da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 17391da177e4SLinus Torvalds /* 17401da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 17411da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 17421da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 17431da177e4SLinus Torvalds */ 17441da177e4SLinus Torvalds if (!udev->bus->is_b_host 17451da177e4SLinus Torvalds && udev->config 17461da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 17472eb5052eSFelipe Balbi struct usb_otg_descriptor *desc = NULL; 17481da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 17491da177e4SLinus Torvalds 17501da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 17511da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 17521da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 17531da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 17541da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 175512c3da34SAlan Stern unsigned port1 = udev->portnum; 17561da177e4SLinus Torvalds 17571da177e4SLinus Torvalds dev_info(&udev->dev, 17581da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 17591da177e4SLinus Torvalds (port1 == bus->otg_port) 17601da177e4SLinus Torvalds ? "" : "non-"); 17611da177e4SLinus Torvalds 17621da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 17631da177e4SLinus Torvalds if (port1 == bus->otg_port) 17641da177e4SLinus Torvalds bus->b_hnp_enable = 1; 17651da177e4SLinus Torvalds err = usb_control_msg(udev, 17661da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 17671da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 17681da177e4SLinus Torvalds bus->b_hnp_enable 17691da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 17701da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 17711da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 17721da177e4SLinus Torvalds if (err < 0) { 17731da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 17741da177e4SLinus Torvalds * customize to match your product. 17751da177e4SLinus Torvalds */ 17761da177e4SLinus Torvalds dev_info(&udev->dev, 1777b9cef6c3SWu Fengguang "can't set HNP mode: %d\n", 17781da177e4SLinus Torvalds err); 17791da177e4SLinus Torvalds bus->b_hnp_enable = 0; 17801da177e4SLinus Torvalds } 17811da177e4SLinus Torvalds } 17821da177e4SLinus Torvalds } 17831da177e4SLinus Torvalds } 17841da177e4SLinus Torvalds 17851da177e4SLinus Torvalds if (!is_targeted(udev)) { 17861da177e4SLinus Torvalds 17871da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 17881da177e4SLinus Torvalds * (Includes HNP test device.) 17891da177e4SLinus Torvalds */ 17901da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 1791634a84f8SDavid Brownell err = usb_port_suspend(udev, PMSG_SUSPEND); 17921da177e4SLinus Torvalds if (err < 0) 17931da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 17941da177e4SLinus Torvalds } 1795ffcdc18dSVikram Pandita err = -ENOTSUPP; 17961da177e4SLinus Torvalds goto fail; 17971da177e4SLinus Torvalds } 1798d9d16e8aSInaky Perez-Gonzalez fail: 17991da177e4SLinus Torvalds #endif 1800d9d16e8aSInaky Perez-Gonzalez return err; 1801d9d16e8aSInaky Perez-Gonzalez } 18021da177e4SLinus Torvalds 1803d9d16e8aSInaky Perez-Gonzalez 1804d9d16e8aSInaky Perez-Gonzalez /** 18058d8558d1SAlan Stern * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) 1806d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 1807d9d16e8aSInaky Perez-Gonzalez * 1808d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 1809d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 1810d9d16e8aSInaky Perez-Gonzalez * environment. 1811d9d16e8aSInaky Perez-Gonzalez * 1812d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 1813d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 1814d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 1815d9d16e8aSInaky Perez-Gonzalez */ 18168d8558d1SAlan Stern static int usb_enumerate_device(struct usb_device *udev) 1817d9d16e8aSInaky Perez-Gonzalez { 1818d9d16e8aSInaky Perez-Gonzalez int err; 1819d9d16e8aSInaky Perez-Gonzalez 1820d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 1821d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 1822d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 1823d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 1824d9d16e8aSInaky Perez-Gonzalez err); 1825d9d16e8aSInaky Perez-Gonzalez goto fail; 1826d9d16e8aSInaky Perez-Gonzalez } 1827d9d16e8aSInaky Perez-Gonzalez } 1828d9d16e8aSInaky Perez-Gonzalez if (udev->wusb == 1 && udev->authorized == 0) { 1829d9d16e8aSInaky Perez-Gonzalez udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1830d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1831d9d16e8aSInaky Perez-Gonzalez udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1832d9d16e8aSInaky Perez-Gonzalez } 1833d9d16e8aSInaky Perez-Gonzalez else { 1834d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 1835d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 1836d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 1837d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 1838d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 1839d9d16e8aSInaky Perez-Gonzalez } 18408d8558d1SAlan Stern err = usb_enumerate_device_otg(udev); 1841d9d16e8aSInaky Perez-Gonzalez fail: 1842d9d16e8aSInaky Perez-Gonzalez return err; 1843d9d16e8aSInaky Perez-Gonzalez } 1844d9d16e8aSInaky Perez-Gonzalez 1845d9d16e8aSInaky Perez-Gonzalez 1846d9d16e8aSInaky Perez-Gonzalez /** 1847d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 1848d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 1849d9d16e8aSInaky Perez-Gonzalez * 18508d8558d1SAlan Stern * This is called with devices which have been detected but not fully 18518d8558d1SAlan Stern * enumerated. The device descriptor is available, but not descriptors 1852d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 1853d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 1854d9d16e8aSInaky Perez-Gonzalez * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 1855d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 1856d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 1857d9d16e8aSInaky Perez-Gonzalez * 1858d9d16e8aSInaky Perez-Gonzalez * It will return if the device is configured properly or not. Zero if 1859d9d16e8aSInaky Perez-Gonzalez * the interface was registered with the driver core; else a negative 1860d9d16e8aSInaky Perez-Gonzalez * errno value. 1861d9d16e8aSInaky Perez-Gonzalez * 1862d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 1863d9d16e8aSInaky Perez-Gonzalez * 1864d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 1865d9d16e8aSInaky Perez-Gonzalez */ 1866d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 1867d9d16e8aSInaky Perez-Gonzalez { 1868d9d16e8aSInaky Perez-Gonzalez int err; 1869d9d16e8aSInaky Perez-Gonzalez 187016985408SDan Streetman if (udev->parent) { 187116985408SDan Streetman /* Initialize non-root-hub device wakeup to disabled; 187216985408SDan Streetman * device (un)configuration controls wakeup capable 187316985408SDan Streetman * sysfs power/wakeup controls wakeup enabled/disabled 187416985408SDan Streetman */ 187516985408SDan Streetman device_init_wakeup(&udev->dev, 0); 187616985408SDan Streetman } 187716985408SDan Streetman 18789bbdf1e0SAlan Stern /* Tell the runtime-PM framework the device is active */ 18799bbdf1e0SAlan Stern pm_runtime_set_active(&udev->dev); 1880c08512c7SAlan Stern pm_runtime_get_noresume(&udev->dev); 1881fcc4a01eSAlan Stern pm_runtime_use_autosuspend(&udev->dev); 18829bbdf1e0SAlan Stern pm_runtime_enable(&udev->dev); 18839bbdf1e0SAlan Stern 1884c08512c7SAlan Stern /* By default, forbid autosuspend for all devices. It will be 1885c08512c7SAlan Stern * allowed for hubs during binding. 1886c08512c7SAlan Stern */ 1887c08512c7SAlan Stern usb_disable_autosuspend(udev); 1888c08512c7SAlan Stern 18898d8558d1SAlan Stern err = usb_enumerate_device(udev); /* Read descriptors */ 1890d9d16e8aSInaky Perez-Gonzalez if (err < 0) 1891d9d16e8aSInaky Perez-Gonzalez goto fail; 1892c6515272SSarah Sharp dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", 1893c6515272SSarah Sharp udev->devnum, udev->bus->busnum, 1894c6515272SSarah Sharp (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 18959f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 18969f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 18979f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 18989f8b17e6SKay Sievers 18996cd13201SAlan Stern /* Tell the world! */ 19006cd13201SAlan Stern announce_device(udev); 1901195af2ccSAlan Stern 1902927bc916SRafael J. Wysocki device_enable_async_suspend(&udev->dev); 1903782da727SAlan Stern /* Register the device. The device driver is responsible 19043b23dd6fSAlan Stern * for configuring the device and invoking the add-device 19053b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 1906782da727SAlan Stern */ 19071da177e4SLinus Torvalds err = device_add(&udev->dev); 19081da177e4SLinus Torvalds if (err) { 19091da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 19101da177e4SLinus Torvalds goto fail; 19111da177e4SLinus Torvalds } 19129ad3d6ccSAlan Stern 19133b23dd6fSAlan Stern (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); 1914c08512c7SAlan Stern usb_mark_last_busy(udev); 1915c08512c7SAlan Stern pm_runtime_put_sync_autosuspend(&udev->dev); 1916c066475eSGreg Kroah-Hartman return err; 19171da177e4SLinus Torvalds 19181da177e4SLinus Torvalds fail: 19191da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 19209bbdf1e0SAlan Stern pm_runtime_disable(&udev->dev); 19219bbdf1e0SAlan Stern pm_runtime_set_suspended(&udev->dev); 1922d9d16e8aSInaky Perez-Gonzalez return err; 19231da177e4SLinus Torvalds } 19241da177e4SLinus Torvalds 192593993a0aSInaky Perez-Gonzalez 192693993a0aSInaky Perez-Gonzalez /** 1927fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 1928fd39c86bSRandy Dunlap * @usb_dev: USB device 1929fd39c86bSRandy Dunlap * 1930fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 1931fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 193293993a0aSInaky Perez-Gonzalez * 193393993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 193493993a0aSInaky Perez-Gonzalez * defer its call. 193593993a0aSInaky Perez-Gonzalez */ 193693993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 193793993a0aSInaky Perez-Gonzalez { 193893993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 193993993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 194093993a0aSInaky Perez-Gonzalez goto out_unauthorized; 1941da307123SAlan Stern 194293993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 194393993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 1944da307123SAlan Stern 1945da307123SAlan Stern kfree(usb_dev->product); 194693993a0aSInaky Perez-Gonzalez usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1947da307123SAlan Stern kfree(usb_dev->manufacturer); 194893993a0aSInaky Perez-Gonzalez usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1949da307123SAlan Stern kfree(usb_dev->serial); 195093993a0aSInaky Perez-Gonzalez usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1951da307123SAlan Stern 1952da307123SAlan Stern usb_destroy_configuration(usb_dev); 195393993a0aSInaky Perez-Gonzalez usb_dev->descriptor.bNumConfigurations = 0; 1954da307123SAlan Stern 195593993a0aSInaky Perez-Gonzalez out_unauthorized: 195693993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 195793993a0aSInaky Perez-Gonzalez return 0; 195893993a0aSInaky Perez-Gonzalez } 195993993a0aSInaky Perez-Gonzalez 196093993a0aSInaky Perez-Gonzalez 196193993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 196293993a0aSInaky Perez-Gonzalez { 196393993a0aSInaky Perez-Gonzalez int result = 0, c; 1964da307123SAlan Stern 196593993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 196693993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 196793993a0aSInaky Perez-Gonzalez goto out_authorized; 1968da307123SAlan Stern 196993993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 197093993a0aSInaky Perez-Gonzalez if (result < 0) { 197193993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 197293993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 197393993a0aSInaky Perez-Gonzalez goto error_autoresume; 197493993a0aSInaky Perez-Gonzalez } 197593993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 197693993a0aSInaky Perez-Gonzalez if (result < 0) { 197793993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 197893993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 197993993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 198093993a0aSInaky Perez-Gonzalez } 1981da307123SAlan Stern 1982da307123SAlan Stern kfree(usb_dev->product); 1983da307123SAlan Stern usb_dev->product = NULL; 1984da307123SAlan Stern kfree(usb_dev->manufacturer); 1985da307123SAlan Stern usb_dev->manufacturer = NULL; 1986da307123SAlan Stern kfree(usb_dev->serial); 1987da307123SAlan Stern usb_dev->serial = NULL; 1988da307123SAlan Stern 198993993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 19908d8558d1SAlan Stern result = usb_enumerate_device(usb_dev); 199193993a0aSInaky Perez-Gonzalez if (result < 0) 19928d8558d1SAlan Stern goto error_enumerate; 199393993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 199493993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 199593993a0aSInaky Perez-Gonzalez */ 1996b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 199793993a0aSInaky Perez-Gonzalez if (c >= 0) { 199893993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 199993993a0aSInaky Perez-Gonzalez if (result) { 200093993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 200193993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 200293993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 200393993a0aSInaky Perez-Gonzalez * set other configurations. */ 200493993a0aSInaky Perez-Gonzalez } 200593993a0aSInaky Perez-Gonzalez } 200693993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 2007da307123SAlan Stern 20088d8558d1SAlan Stern error_enumerate: 200993993a0aSInaky Perez-Gonzalez error_device_descriptor: 2010da307123SAlan Stern usb_autosuspend_device(usb_dev); 201193993a0aSInaky Perez-Gonzalez error_autoresume: 201293993a0aSInaky Perez-Gonzalez out_authorized: 201393993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); // complements locktree 201493993a0aSInaky Perez-Gonzalez return result; 201593993a0aSInaky Perez-Gonzalez } 201693993a0aSInaky Perez-Gonzalez 201793993a0aSInaky Perez-Gonzalez 20180165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 20190165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 20200165de09SInaky Perez-Gonzalez { 20210165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 20220165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 20230165de09SInaky Perez-Gonzalez return 0; 20240165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 20250165de09SInaky Perez-Gonzalez return hcd->wireless; 20260165de09SInaky Perez-Gonzalez } 20270165de09SInaky Perez-Gonzalez 20280165de09SInaky Perez-Gonzalez 20291da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 20301da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 20311da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 20321da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 203390ab5ee9SRusty Russell #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first) 20341da177e4SLinus Torvalds 20351da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 20361da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 203775d7cf72SAndiry Xu #define HUB_BH_RESET_TIME 50 20381da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 20391da177e4SLinus Torvalds #define HUB_RESET_TIMEOUT 500 20401da177e4SLinus Torvalds 204110d674a8SSarah Sharp static int hub_port_reset(struct usb_hub *hub, int port1, 204210d674a8SSarah Sharp struct usb_device *udev, unsigned int delay, bool warm); 204310d674a8SSarah Sharp 204410d674a8SSarah Sharp /* Is a USB 3.0 port in the Inactive state? */ 204510d674a8SSarah Sharp static bool hub_port_inactive(struct usb_hub *hub, u16 portstatus) 204610d674a8SSarah Sharp { 204710d674a8SSarah Sharp return hub_is_superspeed(hub->hdev) && 204810d674a8SSarah Sharp (portstatus & USB_PORT_STAT_LINK_STATE) == 204910d674a8SSarah Sharp USB_SS_PORT_LS_SS_INACTIVE; 205010d674a8SSarah Sharp } 205110d674a8SSarah Sharp 20521da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 205375d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 20541da177e4SLinus Torvalds { 20551da177e4SLinus Torvalds int delay_time, ret; 20561da177e4SLinus Torvalds u16 portstatus; 20571da177e4SLinus Torvalds u16 portchange; 20581da177e4SLinus Torvalds 20591da177e4SLinus Torvalds for (delay_time = 0; 20601da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 20611da177e4SLinus Torvalds delay_time += delay) { 20621da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 20631da177e4SLinus Torvalds msleep(delay); 20641da177e4SLinus Torvalds 20651da177e4SLinus Torvalds /* read and decode port status */ 20661da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 20671da177e4SLinus Torvalds if (ret < 0) 20681da177e4SLinus Torvalds return ret; 20691da177e4SLinus Torvalds 207075d7cf72SAndiry Xu /* 207175d7cf72SAndiry Xu * Some buggy devices require a warm reset to be issued even 207275d7cf72SAndiry Xu * when the port appears not to be connected. 207375d7cf72SAndiry Xu */ 207475d7cf72SAndiry Xu if (!warm) { 207510d674a8SSarah Sharp /* 207610d674a8SSarah Sharp * Some buggy devices can cause an NEC host controller 207710d674a8SSarah Sharp * to transition to the "Error" state after a hot port 207810d674a8SSarah Sharp * reset. This will show up as the port state in 207910d674a8SSarah Sharp * "Inactive", and the port may also report a 208010d674a8SSarah Sharp * disconnect. Forcing a warm port reset seems to make 208110d674a8SSarah Sharp * the device work. 208210d674a8SSarah Sharp * 208310d674a8SSarah Sharp * See https://bugzilla.kernel.org/show_bug.cgi?id=41752 208410d674a8SSarah Sharp */ 208510d674a8SSarah Sharp if (hub_port_inactive(hub, portstatus)) { 208610d674a8SSarah Sharp int ret; 208710d674a8SSarah Sharp 208810d674a8SSarah Sharp if ((portchange & USB_PORT_STAT_C_CONNECTION)) 208910d674a8SSarah Sharp clear_port_feature(hub->hdev, port1, 209010d674a8SSarah Sharp USB_PORT_FEAT_C_CONNECTION); 209110d674a8SSarah Sharp if (portchange & USB_PORT_STAT_C_LINK_STATE) 209210d674a8SSarah Sharp clear_port_feature(hub->hdev, port1, 209310d674a8SSarah Sharp USB_PORT_FEAT_C_PORT_LINK_STATE); 209410d674a8SSarah Sharp if (portchange & USB_PORT_STAT_C_RESET) 209510d674a8SSarah Sharp clear_port_feature(hub->hdev, port1, 209610d674a8SSarah Sharp USB_PORT_FEAT_C_RESET); 209710d674a8SSarah Sharp dev_dbg(hub->intfdev, "hot reset failed, warm reset port %d\n", 209810d674a8SSarah Sharp port1); 209910d674a8SSarah Sharp ret = hub_port_reset(hub, port1, 210010d674a8SSarah Sharp udev, HUB_BH_RESET_TIME, 210110d674a8SSarah Sharp true); 210210d674a8SSarah Sharp if ((portchange & USB_PORT_STAT_C_CONNECTION)) 210310d674a8SSarah Sharp clear_port_feature(hub->hdev, port1, 210410d674a8SSarah Sharp USB_PORT_FEAT_C_CONNECTION); 210510d674a8SSarah Sharp return ret; 210610d674a8SSarah Sharp } 21071da177e4SLinus Torvalds /* Device went away? */ 21081da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 21091da177e4SLinus Torvalds return -ENOTCONN; 21101da177e4SLinus Torvalds 2111dd4dd19eSAlan Stern /* bomb out completely if the connection bounced */ 21121da177e4SLinus Torvalds if ((portchange & USB_PORT_STAT_C_CONNECTION)) 2113dd4dd19eSAlan Stern return -ENOTCONN; 21141da177e4SLinus Torvalds 211575d7cf72SAndiry Xu /* if we`ve finished resetting, then break out of 211675d7cf72SAndiry Xu * the loop 211775d7cf72SAndiry Xu */ 21181da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_RESET) && 21191da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_ENABLE)) { 21200165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 2121551cdbbeSGreg Kroah-Hartman udev->speed = USB_SPEED_WIRELESS; 2122131dec34SSarah Sharp else if (hub_is_superspeed(hub->hdev)) 2123809cd1cbSSarah Sharp udev->speed = USB_SPEED_SUPER; 21240165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 21251da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 21261da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 21271da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 21281da177e4SLinus Torvalds else 21291da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 21301da177e4SLinus Torvalds return 0; 21311da177e4SLinus Torvalds } 213275d7cf72SAndiry Xu } else { 213375d7cf72SAndiry Xu if (portchange & USB_PORT_STAT_C_BH_RESET) 213475d7cf72SAndiry Xu return 0; 213575d7cf72SAndiry Xu } 21361da177e4SLinus Torvalds 21371da177e4SLinus Torvalds /* switch to the long delay after two short delay failures */ 21381da177e4SLinus Torvalds if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 21391da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 21401da177e4SLinus Torvalds 21411da177e4SLinus Torvalds dev_dbg (hub->intfdev, 214275d7cf72SAndiry Xu "port %d not %sreset yet, waiting %dms\n", 214375d7cf72SAndiry Xu port1, warm ? "warm " : "", delay); 21441da177e4SLinus Torvalds } 21451da177e4SLinus Torvalds 21461da177e4SLinus Torvalds return -EBUSY; 21471da177e4SLinus Torvalds } 21481da177e4SLinus Torvalds 214975d7cf72SAndiry Xu static void hub_port_finish_reset(struct usb_hub *hub, int port1, 215075d7cf72SAndiry Xu struct usb_device *udev, int *status, bool warm) 21511da177e4SLinus Torvalds { 215275d7cf72SAndiry Xu switch (*status) { 21531da177e4SLinus Torvalds case 0: 215475d7cf72SAndiry Xu if (!warm) { 215575d7cf72SAndiry Xu struct usb_hcd *hcd; 2156b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 2157b789696aSDavid Brownell msleep(10 + 40); 21583b29b68bSAlan Stern update_devnum(udev, 0); 215975d7cf72SAndiry Xu hcd = bus_to_hcd(udev->bus); 2160a5f0efabSSarah Sharp if (hcd->driver->reset_device) { 216175d7cf72SAndiry Xu *status = hcd->driver->reset_device(hcd, udev); 216275d7cf72SAndiry Xu if (*status < 0) { 2163a5f0efabSSarah Sharp dev_err(&udev->dev, "Cannot reset " 2164a5f0efabSSarah Sharp "HCD device state\n"); 2165a5f0efabSSarah Sharp break; 2166a5f0efabSSarah Sharp } 2167a5f0efabSSarah Sharp } 216875d7cf72SAndiry Xu } 21691da177e4SLinus Torvalds /* FALL THROUGH */ 21701da177e4SLinus Torvalds case -ENOTCONN: 21711da177e4SLinus Torvalds case -ENODEV: 21721da177e4SLinus Torvalds clear_port_feature(hub->hdev, 21731da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 21741da177e4SLinus Torvalds /* FIXME need disconnect() for NOTATTACHED device */ 217575d7cf72SAndiry Xu if (warm) { 217675d7cf72SAndiry Xu clear_port_feature(hub->hdev, port1, 217775d7cf72SAndiry Xu USB_PORT_FEAT_C_BH_PORT_RESET); 217875d7cf72SAndiry Xu clear_port_feature(hub->hdev, port1, 217975d7cf72SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 218075d7cf72SAndiry Xu } else { 218175d7cf72SAndiry Xu usb_set_device_state(udev, *status 21821da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 21831da177e4SLinus Torvalds : USB_STATE_DEFAULT); 218475d7cf72SAndiry Xu } 218575d7cf72SAndiry Xu break; 218675d7cf72SAndiry Xu } 218775d7cf72SAndiry Xu } 218875d7cf72SAndiry Xu 218975d7cf72SAndiry Xu /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ 219075d7cf72SAndiry Xu static int hub_port_reset(struct usb_hub *hub, int port1, 219175d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 219275d7cf72SAndiry Xu { 219375d7cf72SAndiry Xu int i, status; 219475d7cf72SAndiry Xu 219575d7cf72SAndiry Xu if (!warm) { 219675d7cf72SAndiry Xu /* Block EHCI CF initialization during the port reset. 219775d7cf72SAndiry Xu * Some companion controllers don't like it when they mix. 219875d7cf72SAndiry Xu */ 219975d7cf72SAndiry Xu down_read(&ehci_cf_port_reset_rwsem); 220075d7cf72SAndiry Xu } else { 220175d7cf72SAndiry Xu if (!hub_is_superspeed(hub->hdev)) { 220275d7cf72SAndiry Xu dev_err(hub->intfdev, "only USB3 hub support " 220375d7cf72SAndiry Xu "warm reset\n"); 220475d7cf72SAndiry Xu return -EINVAL; 220575d7cf72SAndiry Xu } 220675d7cf72SAndiry Xu } 220775d7cf72SAndiry Xu 220875d7cf72SAndiry Xu /* Reset the port */ 220975d7cf72SAndiry Xu for (i = 0; i < PORT_RESET_TRIES; i++) { 221075d7cf72SAndiry Xu status = set_port_feature(hub->hdev, port1, (warm ? 221175d7cf72SAndiry Xu USB_PORT_FEAT_BH_PORT_RESET : 221275d7cf72SAndiry Xu USB_PORT_FEAT_RESET)); 221375d7cf72SAndiry Xu if (status) { 221475d7cf72SAndiry Xu dev_err(hub->intfdev, 221575d7cf72SAndiry Xu "cannot %sreset port %d (err = %d)\n", 221675d7cf72SAndiry Xu warm ? "warm " : "", port1, status); 221775d7cf72SAndiry Xu } else { 221875d7cf72SAndiry Xu status = hub_port_wait_reset(hub, port1, udev, delay, 221975d7cf72SAndiry Xu warm); 222075d7cf72SAndiry Xu if (status && status != -ENOTCONN) 222175d7cf72SAndiry Xu dev_dbg(hub->intfdev, 222275d7cf72SAndiry Xu "port_wait_reset: err = %d\n", 222375d7cf72SAndiry Xu status); 222475d7cf72SAndiry Xu } 222575d7cf72SAndiry Xu 222675d7cf72SAndiry Xu /* return on disconnect or reset */ 222775d7cf72SAndiry Xu if (status == 0 || status == -ENOTCONN || status == -ENODEV) { 222875d7cf72SAndiry Xu hub_port_finish_reset(hub, port1, udev, &status, warm); 222932fe0198SAlan Stern goto done; 22301da177e4SLinus Torvalds } 22311da177e4SLinus Torvalds 22321da177e4SLinus Torvalds dev_dbg (hub->intfdev, 223375d7cf72SAndiry Xu "port %d not enabled, trying %sreset again...\n", 223475d7cf72SAndiry Xu port1, warm ? "warm " : ""); 22351da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 22361da177e4SLinus Torvalds } 22371da177e4SLinus Torvalds 22381da177e4SLinus Torvalds dev_err (hub->intfdev, 22391da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 22401da177e4SLinus Torvalds port1); 22411da177e4SLinus Torvalds 224232fe0198SAlan Stern done: 224375d7cf72SAndiry Xu if (!warm) 224432fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 224575d7cf72SAndiry Xu 22461da177e4SLinus Torvalds return status; 22471da177e4SLinus Torvalds } 22481da177e4SLinus Torvalds 22490ed9a57eSAndiry Xu /* Check if a port is power on */ 22500ed9a57eSAndiry Xu static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) 22510ed9a57eSAndiry Xu { 22520ed9a57eSAndiry Xu int ret = 0; 22530ed9a57eSAndiry Xu 22540ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 22550ed9a57eSAndiry Xu if (portstatus & USB_SS_PORT_STAT_POWER) 22560ed9a57eSAndiry Xu ret = 1; 22570ed9a57eSAndiry Xu } else { 22580ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_POWER) 22590ed9a57eSAndiry Xu ret = 1; 22600ed9a57eSAndiry Xu } 22610ed9a57eSAndiry Xu 22620ed9a57eSAndiry Xu return ret; 22630ed9a57eSAndiry Xu } 22640ed9a57eSAndiry Xu 2265d388dab7SAlan Stern #ifdef CONFIG_PM 22661da177e4SLinus Torvalds 22670ed9a57eSAndiry Xu /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ 22680ed9a57eSAndiry Xu static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) 22690ed9a57eSAndiry Xu { 22700ed9a57eSAndiry Xu int ret = 0; 22710ed9a57eSAndiry Xu 22720ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 22730ed9a57eSAndiry Xu if ((portstatus & USB_PORT_STAT_LINK_STATE) 22740ed9a57eSAndiry Xu == USB_SS_PORT_LS_U3) 22750ed9a57eSAndiry Xu ret = 1; 22760ed9a57eSAndiry Xu } else { 22770ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_SUSPEND) 22780ed9a57eSAndiry Xu ret = 1; 22790ed9a57eSAndiry Xu } 22800ed9a57eSAndiry Xu 22810ed9a57eSAndiry Xu return ret; 22820ed9a57eSAndiry Xu } 2283b01b03f3SAlan Stern 2284b01b03f3SAlan Stern /* Determine whether the device on a port is ready for a normal resume, 2285b01b03f3SAlan Stern * is ready for a reset-resume, or should be disconnected. 2286b01b03f3SAlan Stern */ 2287b01b03f3SAlan Stern static int check_port_resume_type(struct usb_device *udev, 2288b01b03f3SAlan Stern struct usb_hub *hub, int port1, 2289b01b03f3SAlan Stern int status, unsigned portchange, unsigned portstatus) 2290b01b03f3SAlan Stern { 2291b01b03f3SAlan Stern /* Is the device still present? */ 22920ed9a57eSAndiry Xu if (status || port_is_suspended(hub, portstatus) || 22930ed9a57eSAndiry Xu !port_is_power_on(hub, portstatus) || 22940ed9a57eSAndiry Xu !(portstatus & USB_PORT_STAT_CONNECTION)) { 2295b01b03f3SAlan Stern if (status >= 0) 2296b01b03f3SAlan Stern status = -ENODEV; 2297b01b03f3SAlan Stern } 2298b01b03f3SAlan Stern 229986c57edfSAlan Stern /* Can't do a normal resume if the port isn't enabled, 230086c57edfSAlan Stern * so try a reset-resume instead. 230186c57edfSAlan Stern */ 230286c57edfSAlan Stern else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { 230386c57edfSAlan Stern if (udev->persist_enabled) 230486c57edfSAlan Stern udev->reset_resume = 1; 230586c57edfSAlan Stern else 2306b01b03f3SAlan Stern status = -ENODEV; 230786c57edfSAlan Stern } 2308b01b03f3SAlan Stern 2309b01b03f3SAlan Stern if (status) { 2310b01b03f3SAlan Stern dev_dbg(hub->intfdev, 2311b01b03f3SAlan Stern "port %d status %04x.%04x after resume, %d\n", 2312b01b03f3SAlan Stern port1, portchange, portstatus, status); 2313b01b03f3SAlan Stern } else if (udev->reset_resume) { 2314b01b03f3SAlan Stern 2315b01b03f3SAlan Stern /* Late port handoff can set status-change bits */ 2316b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) 2317b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2318b01b03f3SAlan Stern USB_PORT_FEAT_C_CONNECTION); 2319b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) 2320b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2321b01b03f3SAlan Stern USB_PORT_FEAT_C_ENABLE); 2322b01b03f3SAlan Stern } 2323b01b03f3SAlan Stern 2324b01b03f3SAlan Stern return status; 2325b01b03f3SAlan Stern } 2326b01b03f3SAlan Stern 23271da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 23281da177e4SLinus Torvalds 23291da177e4SLinus Torvalds /* 2330140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 2331624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 23325edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 23331da177e4SLinus Torvalds * 23341da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 23351da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 23361da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 2337140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 23381da177e4SLinus Torvalds * to disconnect devices while they are suspended. 23391da177e4SLinus Torvalds * 2340390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 2341390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 2342390a8c34SDavid Brownell * 2343624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 2344624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 2345624d6c07SAlan Stern * All devices below the suspended port are also suspended. 2346624d6c07SAlan Stern * 2347624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 2348624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 2349624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 2350624d6c07SAlan Stern * some cases, this wakes the USB host. 2351624d6c07SAlan Stern * 23521da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 23531da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 23541da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 23551da177e4SLinus Torvalds * 23564956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 23574956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 23584956eccdSAlan Stern * State transitions include: 23594956eccdSAlan Stern * 23604956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 23614956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 23624956eccdSAlan Stern * 23634956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 23644956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 23654956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 23664956eccdSAlan Stern * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 23674956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 23684956eccdSAlan Stern * 23694956eccdSAlan Stern * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when 23704956eccdSAlan Stern * the root hub for their bus goes into global suspend ... so we don't 23714956eccdSAlan Stern * (falsely) update the device power state to say it suspended. 23724956eccdSAlan Stern * 23731da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 23741da177e4SLinus Torvalds */ 237565bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 23761da177e4SLinus Torvalds { 2377624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2378624d6c07SAlan Stern int port1 = udev->portnum; 2379624d6c07SAlan Stern int status; 23804956eccdSAlan Stern 2381624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 2382624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 2383624d6c07SAlan Stern * 2384624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 2385624d6c07SAlan Stern * we don't explicitly enable it here. 2386624d6c07SAlan Stern */ 2387624d6c07SAlan Stern if (udev->do_remote_wakeup) { 2388624d6c07SAlan Stern status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2389624d6c07SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 2390624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 2391624d6c07SAlan Stern NULL, 0, 2392624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 23930c487206SOliver Neukum if (status) { 2394624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 2395624d6c07SAlan Stern status); 23960c487206SOliver Neukum /* bail if autosuspend is requested */ 23975b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 23980c487206SOliver Neukum return status; 23990c487206SOliver Neukum } 2400624d6c07SAlan Stern } 2401624d6c07SAlan Stern 240265580b43SAndiry Xu /* disable USB2 hardware LPM */ 240365580b43SAndiry Xu if (udev->usb2_hw_lpm_enabled == 1) 240465580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 0); 240565580b43SAndiry Xu 2406624d6c07SAlan Stern /* see 7.1.7.6 */ 2407a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 2408a7114230SAndiry Xu status = set_port_feature(hub->hdev, 2409a7114230SAndiry Xu port1 | (USB_SS_PORT_LS_U3 << 3), 2410a7114230SAndiry Xu USB_PORT_FEAT_LINK_STATE); 2411a8f08d86SAndiry Xu else 2412a8f08d86SAndiry Xu status = set_port_feature(hub->hdev, port1, 2413a8f08d86SAndiry Xu USB_PORT_FEAT_SUSPEND); 2414624d6c07SAlan Stern if (status) { 2415624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", 2416624d6c07SAlan Stern port1, status); 2417624d6c07SAlan Stern /* paranoia: "should not happen" */ 24180c487206SOliver Neukum if (udev->do_remote_wakeup) 2419624d6c07SAlan Stern (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2420624d6c07SAlan Stern USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 2421624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 2422624d6c07SAlan Stern NULL, 0, 2423624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 2424cbb33004SAlan Stern 2425cbb33004SAlan Stern /* System sleep transitions should never fail */ 24265b1b0b81SAlan Stern if (!PMSG_IS_AUTO(msg)) 2427cbb33004SAlan Stern status = 0; 2428624d6c07SAlan Stern } else { 2429624d6c07SAlan Stern /* device has up to 10 msec to fully suspend */ 243030b1a7a3SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", 243130b1a7a3SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : ""), 243230b1a7a3SAlan Stern udev->do_remote_wakeup); 2433624d6c07SAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 2434624d6c07SAlan Stern msleep(10); 2435624d6c07SAlan Stern } 2436c08512c7SAlan Stern usb_mark_last_busy(hub->hdev); 24374956eccdSAlan Stern return status; 24381da177e4SLinus Torvalds } 2439f3f3253dSDavid Brownell 24401da177e4SLinus Torvalds /* 2441390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 2442390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 244354515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 24441da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 24451da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 24461da177e4SLinus Torvalds * in the tree that's rooted at this device. 244754515fe5SAlan Stern * 244854515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 244954515fe5SAlan Stern * status check is done. 24501da177e4SLinus Torvalds */ 2451140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 24521da177e4SLinus Torvalds { 245354515fe5SAlan Stern int status = 0; 24541da177e4SLinus Torvalds u16 devstatus; 24551da177e4SLinus Torvalds 24561da177e4SLinus Torvalds /* caller owns the udev device lock */ 2457b9cef6c3SWu Fengguang dev_dbg(&udev->dev, "%s\n", 2458b9cef6c3SWu Fengguang udev->reset_resume ? "finish reset-resume" : "finish resume"); 24591da177e4SLinus Torvalds 24601da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 24611da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 24621da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 24631da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 24641da177e4SLinus Torvalds */ 24651da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 24661da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 24671da177e4SLinus Torvalds : USB_STATE_ADDRESS); 24681da177e4SLinus Torvalds 246954515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 247054515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 247154515fe5SAlan Stern * operation is carried out here, after the port has been 247254515fe5SAlan Stern * resumed. 247354515fe5SAlan Stern */ 247454515fe5SAlan Stern if (udev->reset_resume) 247586c57edfSAlan Stern retry_reset_resume: 2476742120c6SMing Lei status = usb_reset_and_verify_device(udev); 247754515fe5SAlan Stern 24781da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 24791da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 24801da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 24811da177e4SLinus Torvalds */ 248254515fe5SAlan Stern if (status == 0) { 248346dede46SAlan Stern devstatus = 0; 24841da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 2485b40b7a90SAlan Stern if (status >= 0) 248646dede46SAlan Stern status = (status > 0 ? 0 : -ENODEV); 248786c57edfSAlan Stern 248886c57edfSAlan Stern /* If a normal resume failed, try doing a reset-resume */ 248986c57edfSAlan Stern if (status && !udev->reset_resume && udev->persist_enabled) { 249086c57edfSAlan Stern dev_dbg(&udev->dev, "retry with reset-resume\n"); 249186c57edfSAlan Stern udev->reset_resume = 1; 249286c57edfSAlan Stern goto retry_reset_resume; 249386c57edfSAlan Stern } 249454515fe5SAlan Stern } 2495b40b7a90SAlan Stern 2496624d6c07SAlan Stern if (status) { 2497624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 24981da177e4SLinus Torvalds status); 2499624d6c07SAlan Stern } else if (udev->actconfig) { 25001da177e4SLinus Torvalds le16_to_cpus(&devstatus); 2501686314cfSAlan Stern if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { 25021da177e4SLinus Torvalds status = usb_control_msg(udev, 25031da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 25041da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, 25051da177e4SLinus Torvalds USB_RECIP_DEVICE, 25061da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 25071da177e4SLinus Torvalds NULL, 0, 25081da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 2509a8e7c565SAlan Stern if (status) 2510b9cef6c3SWu Fengguang dev_dbg(&udev->dev, 2511b9cef6c3SWu Fengguang "disable remote wakeup, status %d\n", 2512b9cef6c3SWu Fengguang status); 25134bf0ba86SAlan Stern } 25141da177e4SLinus Torvalds status = 0; 25151da177e4SLinus Torvalds } 25161da177e4SLinus Torvalds return status; 25171da177e4SLinus Torvalds } 25181da177e4SLinus Torvalds 2519624d6c07SAlan Stern /* 2520624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 2521624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 2522624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 2523624d6c07SAlan Stern * 2524624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 2525624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 2526624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 2527624d6c07SAlan Stern * the host and the device is the same as it was when the device 2528624d6c07SAlan Stern * suspended. 2529624d6c07SAlan Stern * 2530feccc30dSAlan Stern * If @udev->reset_resume is set then this routine won't check that the 2531feccc30dSAlan Stern * port is still enabled. Furthermore, finish_port_resume() above will 253254515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 253354515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 253454515fe5SAlan Stern * 253554515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 253654515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 253754515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 253854515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 253954515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 254054515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 254154515fe5SAlan Stern * made to appear as if it had not disconnected. 254254515fe5SAlan Stern * 2543742120c6SMing Lei * This facility can be dangerous. Although usb_reset_and_verify_device() makes 2544feccc30dSAlan Stern * every effort to insure that the same device is present after the 254554515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 254654515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 254754515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 254854515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 254954515fe5SAlan Stern * new card is corrupted and the system crashes. 255054515fe5SAlan Stern * 2551624d6c07SAlan Stern * Returns 0 on success, else negative errno. 2552624d6c07SAlan Stern */ 255365bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 25541da177e4SLinus Torvalds { 2555624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2556624d6c07SAlan Stern int port1 = udev->portnum; 25571da177e4SLinus Torvalds int status; 2558d25450c6SAlan Stern u16 portchange, portstatus; 2559d25450c6SAlan Stern 2560d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 2561d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 25620ed9a57eSAndiry Xu if (status == 0 && !port_is_suspended(hub, portstatus)) 2563d25450c6SAlan Stern goto SuspendCleared; 25641da177e4SLinus Torvalds 25651da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "resume port %d\n", port1); 25661da177e4SLinus Torvalds 2567d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 2568d5cbad4bSAlan Stern 25691da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 2570a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 2571a7114230SAndiry Xu status = set_port_feature(hub->hdev, 2572a7114230SAndiry Xu port1 | (USB_SS_PORT_LS_U0 << 3), 2573a7114230SAndiry Xu USB_PORT_FEAT_LINK_STATE); 2574a7114230SAndiry Xu else 25751da177e4SLinus Torvalds status = clear_port_feature(hub->hdev, 25761da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 25771da177e4SLinus Torvalds if (status) { 2578624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", 25791da177e4SLinus Torvalds port1, status); 25801da177e4SLinus Torvalds } else { 25811da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 2582645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 25835b1b0b81SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : "")); 25841da177e4SLinus Torvalds msleep(25); 25851da177e4SLinus Torvalds 25861da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 25871da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 25881da177e4SLinus Torvalds * sequence. 25891da177e4SLinus Torvalds */ 2590d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 259154515fe5SAlan Stern 25921da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 25931da177e4SLinus Torvalds msleep(10); 25941da177e4SLinus Torvalds } 2595b01b03f3SAlan Stern 2596b01b03f3SAlan Stern SuspendCleared: 2597b01b03f3SAlan Stern if (status == 0) { 2598a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) { 2599a7114230SAndiry Xu if (portchange & USB_PORT_STAT_C_LINK_STATE) 2600a7114230SAndiry Xu clear_port_feature(hub->hdev, port1, 2601a7114230SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 2602a7114230SAndiry Xu } else { 2603b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 2604b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2605b01b03f3SAlan Stern USB_PORT_FEAT_C_SUSPEND); 26061da177e4SLinus Torvalds } 2607a7114230SAndiry Xu } 26081da177e4SLinus Torvalds 2609d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 2610d5cbad4bSAlan Stern 2611b01b03f3SAlan Stern status = check_port_resume_type(udev, 2612b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 261354515fe5SAlan Stern if (status == 0) 261454515fe5SAlan Stern status = finish_port_resume(udev); 261554515fe5SAlan Stern if (status < 0) { 261654515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 261754515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 261865580b43SAndiry Xu } else { 261965580b43SAndiry Xu /* Try to enable USB2 hardware LPM */ 262065580b43SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 262165580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 262254515fe5SAlan Stern } 262365580b43SAndiry Xu 26241da177e4SLinus Torvalds return status; 26251da177e4SLinus Torvalds } 26261da177e4SLinus Torvalds 26278808f00cSAlan Stern /* caller has locked udev */ 26280534d468SAlan Stern int usb_remote_wakeup(struct usb_device *udev) 26291da177e4SLinus Torvalds { 26301da177e4SLinus Torvalds int status = 0; 26311da177e4SLinus Torvalds 26321da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 2633645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 26349bbdf1e0SAlan Stern status = usb_autoresume_device(udev); 26359bbdf1e0SAlan Stern if (status == 0) { 26369bbdf1e0SAlan Stern /* Let the drivers do their thing, then... */ 26379bbdf1e0SAlan Stern usb_autosuspend_device(udev); 26389bbdf1e0SAlan Stern } 2639d25450c6SAlan Stern } 26401da177e4SLinus Torvalds return status; 26411da177e4SLinus Torvalds } 26421da177e4SLinus Torvalds 2643d388dab7SAlan Stern #else /* CONFIG_USB_SUSPEND */ 2644d388dab7SAlan Stern 2645d388dab7SAlan Stern /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ 2646d388dab7SAlan Stern 264765bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 2648d388dab7SAlan Stern { 2649d388dab7SAlan Stern return 0; 2650d388dab7SAlan Stern } 2651d388dab7SAlan Stern 2652b01b03f3SAlan Stern /* However we may need to do a reset-resume */ 2653b01b03f3SAlan Stern 265465bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 2655d388dab7SAlan Stern { 2656b01b03f3SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2657b01b03f3SAlan Stern int port1 = udev->portnum; 2658b01b03f3SAlan Stern int status; 2659b01b03f3SAlan Stern u16 portchange, portstatus; 266054515fe5SAlan Stern 2661b01b03f3SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 2662b01b03f3SAlan Stern status = check_port_resume_type(udev, 2663b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 2664b01b03f3SAlan Stern 2665b01b03f3SAlan Stern if (status) { 2666b01b03f3SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 2667b01b03f3SAlan Stern hub_port_logical_disconnect(hub, port1); 2668b01b03f3SAlan Stern } else if (udev->reset_resume) { 266954515fe5SAlan Stern dev_dbg(&udev->dev, "reset-resume\n"); 2670742120c6SMing Lei status = usb_reset_and_verify_device(udev); 267154515fe5SAlan Stern } 267254515fe5SAlan Stern return status; 2673d388dab7SAlan Stern } 2674d388dab7SAlan Stern 2675d388dab7SAlan Stern #endif 2676d388dab7SAlan Stern 2677db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 26781da177e4SLinus Torvalds { 26791da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 26801da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 26811da177e4SLinus Torvalds unsigned port1; 26821da177e4SLinus Torvalds 2683cbb33004SAlan Stern /* Warn if children aren't already suspended */ 26841da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 26851da177e4SLinus Torvalds struct usb_device *udev; 26861da177e4SLinus Torvalds 26871da177e4SLinus Torvalds udev = hdev->children [port1-1]; 26886840d255SAlan Stern if (udev && udev->can_submit) { 2689cbb33004SAlan Stern dev_warn(&intf->dev, "port %d nyet suspended\n", port1); 26905b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 2691c9f89fa4SDavid Brownell return -EBUSY; 2692c9f89fa4SDavid Brownell } 26931da177e4SLinus Torvalds } 26941da177e4SLinus Torvalds 2695441b62c1SHarvey Harrison dev_dbg(&intf->dev, "%s\n", __func__); 269640f122f3SAlan Stern 2697c9f89fa4SDavid Brownell /* stop khubd and related activity */ 26984330354fSAlan Stern hub_quiesce(hub, HUB_SUSPEND); 2699b6f6436dSAlan Stern return 0; 27001da177e4SLinus Torvalds } 27011da177e4SLinus Torvalds 27021da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 27031da177e4SLinus Torvalds { 27041da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 27051da177e4SLinus Torvalds 27065e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 2707f2835219SAlan Stern hub_activate(hub, HUB_RESUME); 27081da177e4SLinus Torvalds return 0; 27091da177e4SLinus Torvalds } 27101da177e4SLinus Torvalds 2711b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 2712f07600cfSAlan Stern { 2713b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 2714f07600cfSAlan Stern 27155e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 2716f2835219SAlan Stern hub_activate(hub, HUB_RESET_RESUME); 2717f07600cfSAlan Stern return 0; 2718f07600cfSAlan Stern } 2719f07600cfSAlan Stern 272054515fe5SAlan Stern /** 272154515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 272254515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 272354515fe5SAlan Stern * 272454515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 272554515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 2726feccc30dSAlan Stern * has been reset. The routine marks @rhdev as having lost power. 2727feccc30dSAlan Stern * When the hub driver is resumed it will take notice and carry out 2728feccc30dSAlan Stern * power-session recovery for all the "USB-PERSIST"-enabled child devices; 2729feccc30dSAlan Stern * the others will be disconnected. 273054515fe5SAlan Stern */ 273154515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 273254515fe5SAlan Stern { 273354515fe5SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 273454515fe5SAlan Stern rhdev->reset_resume = 1; 273554515fe5SAlan Stern } 273654515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 273754515fe5SAlan Stern 2738d388dab7SAlan Stern #else /* CONFIG_PM */ 2739d388dab7SAlan Stern 2740511366daSAndrew Morton #define hub_suspend NULL 2741511366daSAndrew Morton #define hub_resume NULL 2742f07600cfSAlan Stern #define hub_reset_resume NULL 2743d388dab7SAlan Stern #endif 2744d388dab7SAlan Stern 27451da177e4SLinus Torvalds 27461da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 27471da177e4SLinus Torvalds * 27481da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 27491da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 27501da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 27511da177e4SLinus Torvalds * 27521da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 27531da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 27541da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 27551da177e4SLinus Torvalds * 27561da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 27571da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 27581da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 27591da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 27601da177e4SLinus Torvalds */ 27611da177e4SLinus Torvalds static int hub_port_debounce(struct usb_hub *hub, int port1) 27621da177e4SLinus Torvalds { 27631da177e4SLinus Torvalds int ret; 27641da177e4SLinus Torvalds int total_time, stable_time = 0; 27651da177e4SLinus Torvalds u16 portchange, portstatus; 27661da177e4SLinus Torvalds unsigned connection = 0xffff; 27671da177e4SLinus Torvalds 27681da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 27691da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 27701da177e4SLinus Torvalds if (ret < 0) 27711da177e4SLinus Torvalds return ret; 27721da177e4SLinus Torvalds 27731da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 27741da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 27751da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 27761da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 27771da177e4SLinus Torvalds break; 27781da177e4SLinus Torvalds } else { 27791da177e4SLinus Torvalds stable_time = 0; 27801da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 27811da177e4SLinus Torvalds } 27821da177e4SLinus Torvalds 27831da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 27841da177e4SLinus Torvalds clear_port_feature(hub->hdev, port1, 27851da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 27861da177e4SLinus Torvalds } 27871da177e4SLinus Torvalds 27881da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 27891da177e4SLinus Torvalds break; 27901da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 27911da177e4SLinus Torvalds } 27921da177e4SLinus Torvalds 27931da177e4SLinus Torvalds dev_dbg (hub->intfdev, 27941da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 27951da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 27961da177e4SLinus Torvalds 27971da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 27981da177e4SLinus Torvalds return -ETIMEDOUT; 27991da177e4SLinus Torvalds return portstatus; 28001da177e4SLinus Torvalds } 28011da177e4SLinus Torvalds 2802fc721f51SInaky Perez-Gonzalez void usb_ep0_reinit(struct usb_device *udev) 28031da177e4SLinus Torvalds { 2804ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); 2805ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); 28062caf7fcdSAlan Stern usb_enable_endpoint(udev, &udev->ep0, true); 28071da177e4SLinus Torvalds } 2808fc721f51SInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_ep0_reinit); 28091da177e4SLinus Torvalds 28101da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 28111da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 28121da177e4SLinus Torvalds 28134326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 28141da177e4SLinus Torvalds { 28151da177e4SLinus Torvalds int retval; 2816c6515272SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 28171da177e4SLinus Torvalds 2818c6515272SSarah Sharp /* 2819c6515272SSarah Sharp * The host controller will choose the device address, 2820c6515272SSarah Sharp * instead of the core having chosen it earlier 2821c6515272SSarah Sharp */ 2822c6515272SSarah Sharp if (!hcd->driver->address_device && devnum <= 1) 28231da177e4SLinus Torvalds return -EINVAL; 28241da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 28251da177e4SLinus Torvalds return 0; 28261da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 28271da177e4SLinus Torvalds return -EINVAL; 2828c8d4af8eSAndiry Xu if (hcd->driver->address_device) 2829c6515272SSarah Sharp retval = hcd->driver->address_device(hcd, udev); 2830c8d4af8eSAndiry Xu else 28311da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 28324326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 28331da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 28341da177e4SLinus Torvalds if (retval == 0) { 28353b29b68bSAlan Stern update_devnum(udev, devnum); 28364953d141SDavid Vrabel /* Device now using proper address. */ 28371da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 2838fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 28391da177e4SLinus Torvalds } 28401da177e4SLinus Torvalds return retval; 28411da177e4SLinus Torvalds } 28421da177e4SLinus Torvalds 28431da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 28441da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 28451da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 28461da177e4SLinus Torvalds * 28471da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 2848742120c6SMing Lei * usb_reset_and_verify_device), the caller must own the device lock. For a 28491da177e4SLinus Torvalds * newly detected device that is not accessible through any global 28501da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 28511da177e4SLinus Torvalds */ 28521da177e4SLinus Torvalds static int 28531da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 28541da177e4SLinus Torvalds int retry_counter) 28551da177e4SLinus Torvalds { 28564186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 28571da177e4SLinus Torvalds 28581da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 2859e7b77172SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 28601da177e4SLinus Torvalds int i, j, retval; 28611da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 28621da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 2863e538dfdaSMichal Nazarewicz const char *speed; 28644326ed0bSAlan Stern int devnum = udev->devnum; 28651da177e4SLinus Torvalds 28661da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 28671da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 28681da177e4SLinus Torvalds */ 28691da177e4SLinus Torvalds if (!hdev->parent) { 28701da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 28711da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 28721da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 28731da177e4SLinus Torvalds } 28741da177e4SLinus Torvalds 28751da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 28761da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 28771da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 28781da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 28791da177e4SLinus Torvalds 28804186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 28811da177e4SLinus Torvalds 28821da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 2883e7b77172SSarah Sharp /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ 288475d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 28851da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 28861da177e4SLinus Torvalds goto fail; 28871da177e4SLinus Torvalds /* success, speed is known */ 288807194ab7SLuben Tuikov 28891da177e4SLinus Torvalds retval = -ENODEV; 28901da177e4SLinus Torvalds 28911da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 28921da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 28931da177e4SLinus Torvalds goto fail; 28941da177e4SLinus Torvalds } 28951da177e4SLinus Torvalds oldspeed = udev->speed; 28961da177e4SLinus Torvalds 28971da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 28981da177e4SLinus Torvalds * it's fixed size except for full speed devices. 28995bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 29005bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 29011da177e4SLinus Torvalds */ 29021da177e4SLinus Torvalds switch (udev->speed) { 29036b403b02SSarah Sharp case USB_SPEED_SUPER: 2904551cdbbeSGreg Kroah-Hartman case USB_SPEED_WIRELESS: /* fixed at 512 */ 2905551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); 29065bb6e0aeSInaky Perez-Gonzalez break; 29071da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 2908551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 29091da177e4SLinus Torvalds break; 29101da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 29111da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 29121da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 29131da177e4SLinus Torvalds * then correct our initial guess. 29141da177e4SLinus Torvalds */ 2915551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 29161da177e4SLinus Torvalds break; 29171da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 2918551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); 29191da177e4SLinus Torvalds break; 29201da177e4SLinus Torvalds default: 29211da177e4SLinus Torvalds goto fail; 29221da177e4SLinus Torvalds } 29231da177e4SLinus Torvalds 2924e538dfdaSMichal Nazarewicz if (udev->speed == USB_SPEED_WIRELESS) 2925e538dfdaSMichal Nazarewicz speed = "variable speed Wireless"; 2926e538dfdaSMichal Nazarewicz else 2927e538dfdaSMichal Nazarewicz speed = usb_speed_string(udev->speed); 2928e538dfdaSMichal Nazarewicz 2929c6515272SSarah Sharp if (udev->speed != USB_SPEED_SUPER) 293083a07196SInaky Perez-Gonzalez dev_info(&udev->dev, 2931e538dfdaSMichal Nazarewicz "%s %s USB device number %d using %s\n", 2932e538dfdaSMichal Nazarewicz (udev->config) ? "reset" : "new", speed, 29333b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 29341da177e4SLinus Torvalds 29351da177e4SLinus Torvalds /* Set up TT records, if needed */ 29361da177e4SLinus Torvalds if (hdev->tt) { 29371da177e4SLinus Torvalds udev->tt = hdev->tt; 29381da177e4SLinus Torvalds udev->ttport = hdev->ttport; 29391da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 29401da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 2941d199c96dSAlan Stern if (!hub->tt.hub) { 2942d199c96dSAlan Stern dev_err(&udev->dev, "parent hub has no TT\n"); 2943d199c96dSAlan Stern retval = -EINVAL; 2944d199c96dSAlan Stern goto fail; 2945d199c96dSAlan Stern } 29461da177e4SLinus Torvalds udev->tt = &hub->tt; 29471da177e4SLinus Torvalds udev->ttport = port1; 29481da177e4SLinus Torvalds } 29491da177e4SLinus Torvalds 29501da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 29511da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 29521da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 29531da177e4SLinus Torvalds * Change it cautiously. 29541da177e4SLinus Torvalds * 29551da177e4SLinus Torvalds * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 29561da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 29571da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 29581da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 29591da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 29601da177e4SLinus Torvalds * value. 29611da177e4SLinus Torvalds */ 29621da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 2963c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) { 29641da177e4SLinus Torvalds struct usb_device_descriptor *buf; 29651da177e4SLinus Torvalds int r = 0; 29661da177e4SLinus Torvalds 29671da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 29681da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 29691da177e4SLinus Torvalds if (!buf) { 29701da177e4SLinus Torvalds retval = -ENOMEM; 29711da177e4SLinus Torvalds continue; 29721da177e4SLinus Torvalds } 29731da177e4SLinus Torvalds 2974b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 2975b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 2976b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 29771da177e4SLinus Torvalds */ 29781da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 29791da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 29801da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 29811da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 29821da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 29831da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 2984fd7c519dSJaroslav Kysela initial_descriptor_timeout); 29851da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 29865bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 29871da177e4SLinus Torvalds if (buf->bDescriptorType == 29881da177e4SLinus Torvalds USB_DT_DEVICE) { 29891da177e4SLinus Torvalds r = 0; 29901da177e4SLinus Torvalds break; 29911da177e4SLinus Torvalds } 29921da177e4SLinus Torvalds /* FALL THROUGH */ 29931da177e4SLinus Torvalds default: 29941da177e4SLinus Torvalds if (r == 0) 29951da177e4SLinus Torvalds r = -EPROTO; 29961da177e4SLinus Torvalds break; 29971da177e4SLinus Torvalds } 29981da177e4SLinus Torvalds if (r == 0) 29991da177e4SLinus Torvalds break; 30001da177e4SLinus Torvalds } 30011da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 30021da177e4SLinus Torvalds buf->bMaxPacketSize0; 30031da177e4SLinus Torvalds kfree(buf); 30041da177e4SLinus Torvalds 300575d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 30061da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 30071da177e4SLinus Torvalds goto fail; 30081da177e4SLinus Torvalds if (oldspeed != udev->speed) { 30091da177e4SLinus Torvalds dev_dbg(&udev->dev, 30101da177e4SLinus Torvalds "device reset changed speed!\n"); 30111da177e4SLinus Torvalds retval = -ENODEV; 30121da177e4SLinus Torvalds goto fail; 30131da177e4SLinus Torvalds } 30141da177e4SLinus Torvalds if (r) { 3015b9cef6c3SWu Fengguang dev_err(&udev->dev, 3016b9cef6c3SWu Fengguang "device descriptor read/64, error %d\n", 3017b9cef6c3SWu Fengguang r); 30181da177e4SLinus Torvalds retval = -EMSGSIZE; 30191da177e4SLinus Torvalds continue; 30201da177e4SLinus Torvalds } 30211da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 30221da177e4SLinus Torvalds } 30231da177e4SLinus Torvalds 30246c529cdcSInaky Perez-Gonzalez /* 30256c529cdcSInaky Perez-Gonzalez * If device is WUSB, we already assigned an 30266c529cdcSInaky Perez-Gonzalez * unauthorized address in the Connect Ack sequence; 30276c529cdcSInaky Perez-Gonzalez * authorization will assign the final address. 30286c529cdcSInaky Perez-Gonzalez */ 30296c529cdcSInaky Perez-Gonzalez if (udev->wusb == 0) { 30301da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 30314326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 30321da177e4SLinus Torvalds if (retval >= 0) 30331da177e4SLinus Torvalds break; 30341da177e4SLinus Torvalds msleep(200); 30351da177e4SLinus Torvalds } 30361da177e4SLinus Torvalds if (retval < 0) { 30371da177e4SLinus Torvalds dev_err(&udev->dev, 30381da177e4SLinus Torvalds "device not accepting address %d, error %d\n", 30394326ed0bSAlan Stern devnum, retval); 30401da177e4SLinus Torvalds goto fail; 30411da177e4SLinus Torvalds } 3042c6515272SSarah Sharp if (udev->speed == USB_SPEED_SUPER) { 3043c6515272SSarah Sharp devnum = udev->devnum; 3044c6515272SSarah Sharp dev_info(&udev->dev, 30453b29b68bSAlan Stern "%s SuperSpeed USB device number %d using %s\n", 3046c6515272SSarah Sharp (udev->config) ? "reset" : "new", 30473b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 3048c6515272SSarah Sharp } 30491da177e4SLinus Torvalds 30501da177e4SLinus Torvalds /* cope with hardware quirkiness: 30511da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 30521da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 30531da177e4SLinus Torvalds */ 30541da177e4SLinus Torvalds msleep(10); 3055c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) 30561da177e4SLinus Torvalds break; 30576c529cdcSInaky Perez-Gonzalez } 30581da177e4SLinus Torvalds 30591da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 30601da177e4SLinus Torvalds if (retval < 8) { 3061b9cef6c3SWu Fengguang dev_err(&udev->dev, 3062b9cef6c3SWu Fengguang "device descriptor read/8, error %d\n", 3063b9cef6c3SWu Fengguang retval); 30641da177e4SLinus Torvalds if (retval >= 0) 30651da177e4SLinus Torvalds retval = -EMSGSIZE; 30661da177e4SLinus Torvalds } else { 30671da177e4SLinus Torvalds retval = 0; 30681da177e4SLinus Torvalds break; 30691da177e4SLinus Torvalds } 30701da177e4SLinus Torvalds } 30711da177e4SLinus Torvalds if (retval) 30721da177e4SLinus Torvalds goto fail; 30731da177e4SLinus Torvalds 30746b403b02SSarah Sharp if (udev->descriptor.bMaxPacketSize0 == 0xff || 30756b403b02SSarah Sharp udev->speed == USB_SPEED_SUPER) 30766b403b02SSarah Sharp i = 512; 30776b403b02SSarah Sharp else 30786b403b02SSarah Sharp i = udev->descriptor.bMaxPacketSize0; 307929cc8897SKuninori Morimoto if (usb_endpoint_maxp(&udev->ep0.desc) != i) { 308056626a72SAlan Stern if (udev->speed == USB_SPEED_LOW || 30811da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 308256626a72SAlan Stern dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); 30831da177e4SLinus Torvalds retval = -EMSGSIZE; 30841da177e4SLinus Torvalds goto fail; 30851da177e4SLinus Torvalds } 308656626a72SAlan Stern if (udev->speed == USB_SPEED_FULL) 30871da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 308856626a72SAlan Stern else 308956626a72SAlan Stern dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); 30901da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 3091fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 30921da177e4SLinus Torvalds } 30931da177e4SLinus Torvalds 30941da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 30951da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 3096b9cef6c3SWu Fengguang dev_err(&udev->dev, "device descriptor read/all, error %d\n", 3097b9cef6c3SWu Fengguang retval); 30981da177e4SLinus Torvalds if (retval >= 0) 30991da177e4SLinus Torvalds retval = -ENOMSG; 31001da177e4SLinus Torvalds goto fail; 31011da177e4SLinus Torvalds } 31021da177e4SLinus Torvalds 31031ff4df56SAndiry Xu if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { 31041ff4df56SAndiry Xu retval = usb_get_bos_descriptor(udev); 31051ff4df56SAndiry Xu if (!retval) { 31061ff4df56SAndiry Xu if (udev->bos->ext_cap && (USB_LPM_SUPPORT & 31071ff4df56SAndiry Xu le32_to_cpu(udev->bos->ext_cap->bmAttributes))) 31081ff4df56SAndiry Xu udev->lpm_capable = 1; 31091ff4df56SAndiry Xu } 31101ff4df56SAndiry Xu } 31113148bf04SAndiry Xu 31121da177e4SLinus Torvalds retval = 0; 311348f24970SAlek Du /* notify HCD that we have a device connected and addressed */ 311448f24970SAlek Du if (hcd->driver->update_device) 311548f24970SAlek Du hcd->driver->update_device(hcd, udev); 31161da177e4SLinus Torvalds fail: 31174326ed0bSAlan Stern if (retval) { 31181da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 31193b29b68bSAlan Stern update_devnum(udev, devnum); /* for disconnect processing */ 31204326ed0bSAlan Stern } 31214186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 31221da177e4SLinus Torvalds return retval; 31231da177e4SLinus Torvalds } 31241da177e4SLinus Torvalds 31251da177e4SLinus Torvalds static void 31261da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 31271da177e4SLinus Torvalds { 31281da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 31291da177e4SLinus Torvalds int status; 31301da177e4SLinus Torvalds 3131e94b1766SChristoph Lameter qual = kmalloc (sizeof *qual, GFP_KERNEL); 31321da177e4SLinus Torvalds if (qual == NULL) 31331da177e4SLinus Torvalds return; 31341da177e4SLinus Torvalds 31351da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 31361da177e4SLinus Torvalds qual, sizeof *qual); 31371da177e4SLinus Torvalds if (status == sizeof *qual) { 31381da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 31391da177e4SLinus Torvalds "connect to a high speed hub\n"); 31401da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 31411da177e4SLinus Torvalds if (hub->has_indicators) { 31421da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 3143c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 31441da177e4SLinus Torvalds } 31451da177e4SLinus Torvalds } 31461da177e4SLinus Torvalds kfree(qual); 31471da177e4SLinus Torvalds } 31481da177e4SLinus Torvalds 31491da177e4SLinus Torvalds static unsigned 31501da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 31511da177e4SLinus Torvalds { 31521da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 31531da177e4SLinus Torvalds int remaining; 315455c52718SAlan Stern int port1; 31551da177e4SLinus Torvalds 315655c52718SAlan Stern if (!hub->limited_power) 31571da177e4SLinus Torvalds return 0; 31581da177e4SLinus Torvalds 315955c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 316055c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 316155c52718SAlan Stern struct usb_device *udev = hdev->children[port1 - 1]; 316255c52718SAlan Stern int delta; 31631da177e4SLinus Torvalds 31641da177e4SLinus Torvalds if (!udev) 31651da177e4SLinus Torvalds continue; 31661da177e4SLinus Torvalds 316755c52718SAlan Stern /* Unconfigured devices may not use more than 100mA, 316855c52718SAlan Stern * or 8mA for OTG ports */ 31691da177e4SLinus Torvalds if (udev->actconfig) 317055c52718SAlan Stern delta = udev->actconfig->desc.bMaxPower * 2; 317155c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 317255c52718SAlan Stern delta = 100; 31731da177e4SLinus Torvalds else 317455c52718SAlan Stern delta = 8; 317555c52718SAlan Stern if (delta > hub->mA_per_port) 3176b9cef6c3SWu Fengguang dev_warn(&udev->dev, 3177b9cef6c3SWu Fengguang "%dmA is over %umA budget for port %d!\n", 317855c52718SAlan Stern delta, hub->mA_per_port, port1); 31791da177e4SLinus Torvalds remaining -= delta; 31801da177e4SLinus Torvalds } 31811da177e4SLinus Torvalds if (remaining < 0) { 318255c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 318355c52718SAlan Stern - remaining); 31841da177e4SLinus Torvalds remaining = 0; 31851da177e4SLinus Torvalds } 31861da177e4SLinus Torvalds return remaining; 31871da177e4SLinus Torvalds } 31881da177e4SLinus Torvalds 31891da177e4SLinus Torvalds /* Handle physical or logical connection change events. 31901da177e4SLinus Torvalds * This routine is called when: 31911da177e4SLinus Torvalds * a port connection-change occurs; 31921da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 3193742120c6SMing Lei * usb_reset_and_verify_device() encounters changed descriptors (as from 31941da177e4SLinus Torvalds * a firmware download) 31951da177e4SLinus Torvalds * caller already locked the hub 31961da177e4SLinus Torvalds */ 31971da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 31981da177e4SLinus Torvalds u16 portstatus, u16 portchange) 31991da177e4SLinus Torvalds { 32001da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 32011da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 320290da096eSBalaji Rao struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 320324618b0cSAlan Stern unsigned wHubCharacteristics = 320424618b0cSAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 32058808f00cSAlan Stern struct usb_device *udev; 32061da177e4SLinus Torvalds int status, i; 32071da177e4SLinus Torvalds 32081da177e4SLinus Torvalds dev_dbg (hub_dev, 32091da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 3210131dec34SSarah Sharp port1, portstatus, portchange, portspeed(hub, portstatus)); 32111da177e4SLinus Torvalds 32121da177e4SLinus Torvalds if (hub->has_indicators) { 32131da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 32141da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 32151da177e4SLinus Torvalds } 32161da177e4SLinus Torvalds 32171da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 32181da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 32191da177e4SLinus Torvalds if (hdev->bus->is_b_host) 322024618b0cSAlan Stern portchange &= ~(USB_PORT_STAT_C_CONNECTION | 322124618b0cSAlan Stern USB_PORT_STAT_C_ENABLE); 32221da177e4SLinus Torvalds #endif 32231da177e4SLinus Torvalds 32248808f00cSAlan Stern /* Try to resuscitate an existing device */ 32258808f00cSAlan Stern udev = hdev->children[port1-1]; 32268808f00cSAlan Stern if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && 32278808f00cSAlan Stern udev->state != USB_STATE_NOTATTACHED) { 32288808f00cSAlan Stern usb_lock_device(udev); 32298808f00cSAlan Stern if (portstatus & USB_PORT_STAT_ENABLE) { 32308808f00cSAlan Stern status = 0; /* Nothing to do */ 32318808f00cSAlan Stern 32328808f00cSAlan Stern #ifdef CONFIG_USB_SUSPEND 32335257d97aSAlan Stern } else if (udev->state == USB_STATE_SUSPENDED && 32345257d97aSAlan Stern udev->persist_enabled) { 32358808f00cSAlan Stern /* For a suspended device, treat this as a 32368808f00cSAlan Stern * remote wakeup event. 32378808f00cSAlan Stern */ 32380534d468SAlan Stern status = usb_remote_wakeup(udev); 32398808f00cSAlan Stern #endif 32408808f00cSAlan Stern 32418808f00cSAlan Stern } else { 32425257d97aSAlan Stern status = -ENODEV; /* Don't resuscitate */ 32438808f00cSAlan Stern } 32448808f00cSAlan Stern usb_unlock_device(udev); 32458808f00cSAlan Stern 32468808f00cSAlan Stern if (status == 0) { 32478808f00cSAlan Stern clear_bit(port1, hub->change_bits); 32488808f00cSAlan Stern return; 32498808f00cSAlan Stern } 32508808f00cSAlan Stern } 32518808f00cSAlan Stern 325224618b0cSAlan Stern /* Disconnect any existing devices under this port */ 32538808f00cSAlan Stern if (udev) 325424618b0cSAlan Stern usb_disconnect(&hdev->children[port1-1]); 325524618b0cSAlan Stern clear_bit(port1, hub->change_bits); 325624618b0cSAlan Stern 3257253e0572SAlan Stern /* We can forget about a "removed" device when there's a physical 3258253e0572SAlan Stern * disconnect or the connect status changes. 3259253e0572SAlan Stern */ 3260253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 3261253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 3262253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 3263253e0572SAlan Stern 32645257d97aSAlan Stern if (portchange & (USB_PORT_STAT_C_CONNECTION | 32655257d97aSAlan Stern USB_PORT_STAT_C_ENABLE)) { 32665257d97aSAlan Stern status = hub_port_debounce(hub, port1); 32675257d97aSAlan Stern if (status < 0) { 32685257d97aSAlan Stern if (printk_ratelimit()) 32695257d97aSAlan Stern dev_err(hub_dev, "connect-debounce failed, " 32705257d97aSAlan Stern "port %d disabled\n", port1); 32715257d97aSAlan Stern portstatus &= ~USB_PORT_STAT_CONNECTION; 32725257d97aSAlan Stern } else { 32735257d97aSAlan Stern portstatus = status; 32745257d97aSAlan Stern } 32755257d97aSAlan Stern } 32765257d97aSAlan Stern 3277253e0572SAlan Stern /* Return now if debouncing failed or nothing is connected or 3278253e0572SAlan Stern * the device was "removed". 3279253e0572SAlan Stern */ 3280253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 3281253e0572SAlan Stern test_bit(port1, hub->removed_bits)) { 32821da177e4SLinus Torvalds 32831da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 328474ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 32850ed9a57eSAndiry Xu && !port_is_power_on(hub, portstatus)) 32861da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 32871da177e4SLinus Torvalds 32881da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 32891da177e4SLinus Torvalds goto done; 32901da177e4SLinus Torvalds return; 32911da177e4SLinus Torvalds } 32921da177e4SLinus Torvalds 32931da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 32941da177e4SLinus Torvalds 32951da177e4SLinus Torvalds /* reallocate for each attempt, since references 32961da177e4SLinus Torvalds * to the previous one can escape in various ways 32971da177e4SLinus Torvalds */ 32981da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 32991da177e4SLinus Torvalds if (!udev) { 33001da177e4SLinus Torvalds dev_err (hub_dev, 33011da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 33021da177e4SLinus Torvalds port1); 33031da177e4SLinus Torvalds goto done; 33041da177e4SLinus Torvalds } 33051da177e4SLinus Torvalds 33061da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 330755c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 3308b6956ffaSAlan Stern udev->level = hdev->level + 1; 33098af548dcSInaky Perez-Gonzalez udev->wusb = hub_is_wusb(hub); 33101da177e4SLinus Torvalds 3311131dec34SSarah Sharp /* Only USB 3.0 devices are connected to SuperSpeed hubs. */ 3312131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 3313e7b77172SSarah Sharp udev->speed = USB_SPEED_SUPER; 3314e7b77172SSarah Sharp else 3315e7b77172SSarah Sharp udev->speed = USB_SPEED_UNKNOWN; 3316e7b77172SSarah Sharp 33173b29b68bSAlan Stern choose_devnum(udev); 3318c6515272SSarah Sharp if (udev->devnum <= 0) { 3319c6515272SSarah Sharp status = -ENOTCONN; /* Don't retry */ 3320c6515272SSarah Sharp goto loop; 3321c6515272SSarah Sharp } 3322c6515272SSarah Sharp 3323e7b77172SSarah Sharp /* reset (non-USB 3.0 devices) and get descriptor */ 33241da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 33251da177e4SLinus Torvalds if (status < 0) 33261da177e4SLinus Torvalds goto loop; 33271da177e4SLinus Torvalds 332893362a87SPhil Dibowitz usb_detect_quirks(udev); 332993362a87SPhil Dibowitz if (udev->quirks & USB_QUIRK_DELAY_INIT) 333093362a87SPhil Dibowitz msleep(1000); 333193362a87SPhil Dibowitz 33321da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 33331da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 33341da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 33351da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 33361da177e4SLinus Torvalds * on the parent. 33371da177e4SLinus Torvalds */ 33381da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 333955c52718SAlan Stern && udev->bus_mA <= 100) { 33401da177e4SLinus Torvalds u16 devstat; 33411da177e4SLinus Torvalds 33421da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 33431da177e4SLinus Torvalds &devstat); 334455c52718SAlan Stern if (status < 2) { 33451da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 33461da177e4SLinus Torvalds goto loop_disable; 33471da177e4SLinus Torvalds } 334855c52718SAlan Stern le16_to_cpus(&devstat); 33491da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 33501da177e4SLinus Torvalds dev_err(&udev->dev, 33511da177e4SLinus Torvalds "can't connect bus-powered hub " 33521da177e4SLinus Torvalds "to this port\n"); 33531da177e4SLinus Torvalds if (hub->has_indicators) { 33541da177e4SLinus Torvalds hub->indicator[port1-1] = 33551da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 3356c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 33571da177e4SLinus Torvalds } 33581da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 33591da177e4SLinus Torvalds goto loop_disable; 33601da177e4SLinus Torvalds } 33611da177e4SLinus Torvalds } 33621da177e4SLinus Torvalds 33631da177e4SLinus Torvalds /* check for devices running slower than they could */ 33641da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 33651da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 33661da177e4SLinus Torvalds && highspeed_hubs != 0) 33671da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 33681da177e4SLinus Torvalds 33691da177e4SLinus Torvalds /* Store the parent's children[] pointer. At this point 33701da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 33711da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 33721da177e4SLinus Torvalds */ 33731da177e4SLinus Torvalds status = 0; 33741da177e4SLinus Torvalds 33751da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 33761da177e4SLinus Torvalds * been disconnected; we would race with the 33771da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 33781da177e4SLinus Torvalds */ 33791da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 33801da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 33811da177e4SLinus Torvalds status = -ENOTCONN; 33821da177e4SLinus Torvalds else 33831da177e4SLinus Torvalds hdev->children[port1-1] = udev; 33841da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 33851da177e4SLinus Torvalds 33861da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 33871da177e4SLinus Torvalds if (!status) { 33881da177e4SLinus Torvalds status = usb_new_device(udev); 33891da177e4SLinus Torvalds if (status) { 33901da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 33911da177e4SLinus Torvalds hdev->children[port1-1] = NULL; 33921da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 33931da177e4SLinus Torvalds } 33941da177e4SLinus Torvalds } 33951da177e4SLinus Torvalds 33961da177e4SLinus Torvalds if (status) 33971da177e4SLinus Torvalds goto loop_disable; 33981da177e4SLinus Torvalds 33991da177e4SLinus Torvalds status = hub_power_remaining(hub); 34001da177e4SLinus Torvalds if (status) 340155c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 34021da177e4SLinus Torvalds 34031da177e4SLinus Torvalds return; 34041da177e4SLinus Torvalds 34051da177e4SLinus Torvalds loop_disable: 34061da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 34071da177e4SLinus Torvalds loop: 3408fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 34093b29b68bSAlan Stern release_devnum(udev); 3410f7410cedSHerbert Xu hub_free_dev(udev); 34111da177e4SLinus Torvalds usb_put_dev(udev); 3412ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 34131da177e4SLinus Torvalds break; 34141da177e4SLinus Torvalds } 34153a31155cSAlan Stern if (hub->hdev->parent || 34163a31155cSAlan Stern !hcd->driver->port_handed_over || 34173a31155cSAlan Stern !(hcd->driver->port_handed_over)(hcd, port1)) 34183a31155cSAlan Stern dev_err(hub_dev, "unable to enumerate USB device on port %d\n", 34193a31155cSAlan Stern port1); 34201da177e4SLinus Torvalds 34211da177e4SLinus Torvalds done: 34221da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 342390da096eSBalaji Rao if (hcd->driver->relinquish_port && !hub->hdev->parent) 342490da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 34251da177e4SLinus Torvalds } 34261da177e4SLinus Torvalds 34271da177e4SLinus Torvalds static void hub_events(void) 34281da177e4SLinus Torvalds { 34291da177e4SLinus Torvalds struct list_head *tmp; 34301da177e4SLinus Torvalds struct usb_device *hdev; 34311da177e4SLinus Torvalds struct usb_interface *intf; 34321da177e4SLinus Torvalds struct usb_hub *hub; 34331da177e4SLinus Torvalds struct device *hub_dev; 34341da177e4SLinus Torvalds u16 hubstatus; 34351da177e4SLinus Torvalds u16 hubchange; 34361da177e4SLinus Torvalds u16 portstatus; 34371da177e4SLinus Torvalds u16 portchange; 34381da177e4SLinus Torvalds int i, ret; 34391da177e4SLinus Torvalds int connect_change; 34401da177e4SLinus Torvalds 34411da177e4SLinus Torvalds /* 34421da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 34431da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 34441da177e4SLinus Torvalds * safe since we delete the hub from the event list. 34451da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 34461da177e4SLinus Torvalds */ 34471da177e4SLinus Torvalds while (1) { 34481da177e4SLinus Torvalds 34491da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 34501da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 34511da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 34521da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 34531da177e4SLinus Torvalds break; 34541da177e4SLinus Torvalds } 34551da177e4SLinus Torvalds 34561da177e4SLinus Torvalds tmp = hub_event_list.next; 34571da177e4SLinus Torvalds list_del_init(tmp); 34581da177e4SLinus Torvalds 34591da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 3460e8054854SAlan Stern kref_get(&hub->kref); 3461e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 34621da177e4SLinus Torvalds 3463e8054854SAlan Stern hdev = hub->hdev; 3464e8054854SAlan Stern hub_dev = hub->intfdev; 3465e8054854SAlan Stern intf = to_usb_interface(hub_dev); 346640f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 34671da177e4SLinus Torvalds hdev->state, hub->descriptor 34681da177e4SLinus Torvalds ? hub->descriptor->bNbrPorts 34691da177e4SLinus Torvalds : 0, 34701da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 34711da177e4SLinus Torvalds (u16) hub->change_bits[0], 347240f122f3SAlan Stern (u16) hub->event_bits[0]); 34731da177e4SLinus Torvalds 34741da177e4SLinus Torvalds /* Lock the device, then check to see if we were 34751da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 347606b84e8aSAlan Stern usb_lock_device(hdev); 3477e8054854SAlan Stern if (unlikely(hub->disconnected)) 34789bbdf1e0SAlan Stern goto loop_disconnected; 34791da177e4SLinus Torvalds 34801da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 34811da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 34827de18d8bSAlan Stern hub->error = -ENODEV; 34834330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 34841da177e4SLinus Torvalds goto loop; 34851da177e4SLinus Torvalds } 34861da177e4SLinus Torvalds 348740f122f3SAlan Stern /* Autoresume */ 348840f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 348940f122f3SAlan Stern if (ret) { 349040f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 34911da177e4SLinus Torvalds goto loop; 349240f122f3SAlan Stern } 349340f122f3SAlan Stern 349440f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 349540f122f3SAlan Stern if (hub->quiescing) 349640f122f3SAlan Stern goto loop_autopm; 34971da177e4SLinus Torvalds 34981da177e4SLinus Torvalds if (hub->error) { 34991da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 35001da177e4SLinus Torvalds hub->error); 35011da177e4SLinus Torvalds 3502742120c6SMing Lei ret = usb_reset_device(hdev); 35031da177e4SLinus Torvalds if (ret) { 35041da177e4SLinus Torvalds dev_dbg (hub_dev, 35051da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 350640f122f3SAlan Stern goto loop_autopm; 35071da177e4SLinus Torvalds } 35081da177e4SLinus Torvalds 35091da177e4SLinus Torvalds hub->nerrors = 0; 35101da177e4SLinus Torvalds hub->error = 0; 35111da177e4SLinus Torvalds } 35121da177e4SLinus Torvalds 35131da177e4SLinus Torvalds /* deal with port status changes */ 35141da177e4SLinus Torvalds for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { 35151da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 35161da177e4SLinus Torvalds continue; 35171da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 35181da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 35196ee0b270SAlan Stern !connect_change) 35201da177e4SLinus Torvalds continue; 35211da177e4SLinus Torvalds 35221da177e4SLinus Torvalds ret = hub_port_status(hub, i, 35231da177e4SLinus Torvalds &portstatus, &portchange); 35241da177e4SLinus Torvalds if (ret < 0) 35251da177e4SLinus Torvalds continue; 35261da177e4SLinus Torvalds 35271da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 35281da177e4SLinus Torvalds clear_port_feature(hdev, i, 35291da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 35301da177e4SLinus Torvalds connect_change = 1; 35311da177e4SLinus Torvalds } 35321da177e4SLinus Torvalds 35331da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 35341da177e4SLinus Torvalds if (!connect_change) 35351da177e4SLinus Torvalds dev_dbg (hub_dev, 35361da177e4SLinus Torvalds "port %d enable change, " 35371da177e4SLinus Torvalds "status %08x\n", 35381da177e4SLinus Torvalds i, portstatus); 35391da177e4SLinus Torvalds clear_port_feature(hdev, i, 35401da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 35411da177e4SLinus Torvalds 35421da177e4SLinus Torvalds /* 35431da177e4SLinus Torvalds * EM interference sometimes causes badly 35441da177e4SLinus Torvalds * shielded USB devices to be shutdown by 35451da177e4SLinus Torvalds * the hub, this hack enables them again. 35461da177e4SLinus Torvalds * Works at least with mouse driver. 35471da177e4SLinus Torvalds */ 35481da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 35491da177e4SLinus Torvalds && !connect_change 35501da177e4SLinus Torvalds && hdev->children[i-1]) { 35511da177e4SLinus Torvalds dev_err (hub_dev, 35521da177e4SLinus Torvalds "port %i " 35531da177e4SLinus Torvalds "disabled by hub (EMI?), " 35541da177e4SLinus Torvalds "re-enabling...\n", 35551da177e4SLinus Torvalds i); 35561da177e4SLinus Torvalds connect_change = 1; 35571da177e4SLinus Torvalds } 35581da177e4SLinus Torvalds } 35591da177e4SLinus Torvalds 35601da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_SUSPEND) { 35618808f00cSAlan Stern struct usb_device *udev; 35628808f00cSAlan Stern 35631da177e4SLinus Torvalds clear_port_feature(hdev, i, 35641da177e4SLinus Torvalds USB_PORT_FEAT_C_SUSPEND); 35658808f00cSAlan Stern udev = hdev->children[i-1]; 35668808f00cSAlan Stern if (udev) { 356749d0f078SAlan Stern /* TRSMRCY = 10 msec */ 356849d0f078SAlan Stern msleep(10); 356949d0f078SAlan Stern 35708808f00cSAlan Stern usb_lock_device(udev); 35710534d468SAlan Stern ret = usb_remote_wakeup(hdev-> 35721da177e4SLinus Torvalds children[i-1]); 35738808f00cSAlan Stern usb_unlock_device(udev); 35741da177e4SLinus Torvalds if (ret < 0) 35751da177e4SLinus Torvalds connect_change = 1; 35761da177e4SLinus Torvalds } else { 35771da177e4SLinus Torvalds ret = -ENODEV; 35781da177e4SLinus Torvalds hub_port_disable(hub, i, 1); 35791da177e4SLinus Torvalds } 35801da177e4SLinus Torvalds dev_dbg (hub_dev, 35811da177e4SLinus Torvalds "resume on port %d, status %d\n", 35821da177e4SLinus Torvalds i, ret); 35831da177e4SLinus Torvalds } 35841da177e4SLinus Torvalds 35851da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 3586752d57a8SPaul Bolle u16 status = 0; 3587752d57a8SPaul Bolle u16 unused; 3588752d57a8SPaul Bolle 3589752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change on port " 3590752d57a8SPaul Bolle "%d\n", i); 35911da177e4SLinus Torvalds clear_port_feature(hdev, i, 35921da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 3593752d57a8SPaul Bolle msleep(100); /* Cool down */ 35948520f380SAlan Stern hub_power_on(hub, true); 3595752d57a8SPaul Bolle hub_port_status(hub, i, &status, &unused); 3596752d57a8SPaul Bolle if (status & USB_PORT_STAT_OVERCURRENT) 3597752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 3598752d57a8SPaul Bolle "condition on port %d\n", i); 35991da177e4SLinus Torvalds } 36001da177e4SLinus Torvalds 36011da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 36021da177e4SLinus Torvalds dev_dbg (hub_dev, 36031da177e4SLinus Torvalds "reset change on port %d\n", 36041da177e4SLinus Torvalds i); 36051da177e4SLinus Torvalds clear_port_feature(hdev, i, 36061da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 36071da177e4SLinus Torvalds } 3608c7061574SSarah Sharp if ((portchange & USB_PORT_STAT_C_BH_RESET) && 3609c7061574SSarah Sharp hub_is_superspeed(hub->hdev)) { 3610c7061574SSarah Sharp dev_dbg(hub_dev, 3611c7061574SSarah Sharp "warm reset change on port %d\n", 3612c7061574SSarah Sharp i); 3613c7061574SSarah Sharp clear_port_feature(hdev, i, 3614c7061574SSarah Sharp USB_PORT_FEAT_C_BH_PORT_RESET); 3615c7061574SSarah Sharp } 3616dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_LINK_STATE) { 3617dbe79bbeSJohn Youn clear_port_feature(hub->hdev, i, 3618dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_LINK_STATE); 3619dbe79bbeSJohn Youn } 3620dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { 3621dbe79bbeSJohn Youn dev_warn(hub_dev, 3622dbe79bbeSJohn Youn "config error on port %d\n", 3623dbe79bbeSJohn Youn i); 3624dbe79bbeSJohn Youn clear_port_feature(hub->hdev, i, 3625dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_CONFIG_ERROR); 3626dbe79bbeSJohn Youn } 36271da177e4SLinus Torvalds 36285e467f6eSAndiry Xu /* Warm reset a USB3 protocol port if it's in 36295e467f6eSAndiry Xu * SS.Inactive state. 36305e467f6eSAndiry Xu */ 36315e467f6eSAndiry Xu if (hub_is_superspeed(hub->hdev) && 36325e467f6eSAndiry Xu (portstatus & USB_PORT_STAT_LINK_STATE) 36335e467f6eSAndiry Xu == USB_SS_PORT_LS_SS_INACTIVE) { 36345e467f6eSAndiry Xu dev_dbg(hub_dev, "warm reset port %d\n", i); 363575d7cf72SAndiry Xu hub_port_reset(hub, i, NULL, 363675d7cf72SAndiry Xu HUB_BH_RESET_TIME, true); 36375e467f6eSAndiry Xu } 36385e467f6eSAndiry Xu 36391da177e4SLinus Torvalds if (connect_change) 36401da177e4SLinus Torvalds hub_port_connect_change(hub, i, 36411da177e4SLinus Torvalds portstatus, portchange); 36421da177e4SLinus Torvalds } /* end for i */ 36431da177e4SLinus Torvalds 36441da177e4SLinus Torvalds /* deal with hub status changes */ 36451da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 36461da177e4SLinus Torvalds ; /* do nothing */ 36471da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 36481da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 36491da177e4SLinus Torvalds else { 36501da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 36511da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 36521da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 365355c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 365455c52718SAlan Stern /* FIXME: Is this always true? */ 365555c52718SAlan Stern hub->limited_power = 1; 3656403fae78Sjidong xiao else 3657403fae78Sjidong xiao hub->limited_power = 0; 36581da177e4SLinus Torvalds } 36591da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 3660752d57a8SPaul Bolle u16 status = 0; 3661752d57a8SPaul Bolle u16 unused; 3662752d57a8SPaul Bolle 3663752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change\n"); 36641da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 3665752d57a8SPaul Bolle msleep(500); /* Cool down */ 36668520f380SAlan Stern hub_power_on(hub, true); 3667752d57a8SPaul Bolle hub_hub_status(hub, &status, &unused); 3668752d57a8SPaul Bolle if (status & HUB_STATUS_OVERCURRENT) 3669752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 3670752d57a8SPaul Bolle "condition\n"); 36711da177e4SLinus Torvalds } 36721da177e4SLinus Torvalds } 36731da177e4SLinus Torvalds 367440f122f3SAlan Stern loop_autopm: 36758e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface() above */ 36768e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 36771da177e4SLinus Torvalds loop: 36788e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface_no_resume() in 36798e4ceb38SAlan Stern * kick_khubd() and allow autosuspend. 36808e4ceb38SAlan Stern */ 36818e4ceb38SAlan Stern usb_autopm_put_interface(intf); 36829bbdf1e0SAlan Stern loop_disconnected: 36831da177e4SLinus Torvalds usb_unlock_device(hdev); 3684e8054854SAlan Stern kref_put(&hub->kref, hub_release); 36851da177e4SLinus Torvalds 36861da177e4SLinus Torvalds } /* end while (1) */ 36871da177e4SLinus Torvalds } 36881da177e4SLinus Torvalds 36891da177e4SLinus Torvalds static int hub_thread(void *__unused) 36901da177e4SLinus Torvalds { 36913bb1af52SAlan Stern /* khubd needs to be freezable to avoid intefering with USB-PERSIST 36923bb1af52SAlan Stern * port handover. Otherwise it might see that a full-speed device 36933bb1af52SAlan Stern * was gone before the EHCI controller had handed its port over to 36943bb1af52SAlan Stern * the companion full-speed controller. 36953bb1af52SAlan Stern */ 369683144186SRafael J. Wysocki set_freezable(); 36973bb1af52SAlan Stern 36981da177e4SLinus Torvalds do { 36991da177e4SLinus Torvalds hub_events(); 3700e42837bcSRafael J. Wysocki wait_event_freezable(khubd_wait, 37019c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 37029c8d6178Sakpm@osdl.org kthread_should_stop()); 37039c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 37041da177e4SLinus Torvalds 37051da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 37069c8d6178Sakpm@osdl.org return 0; 37071da177e4SLinus Torvalds } 37081da177e4SLinus Torvalds 37091e927d96SNémeth Márton static const struct usb_device_id hub_id_table[] = { 37101da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 37111da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 37121da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 37131da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 37141da177e4SLinus Torvalds { } /* Terminating entry */ 37151da177e4SLinus Torvalds }; 37161da177e4SLinus Torvalds 37171da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 37181da177e4SLinus Torvalds 37191da177e4SLinus Torvalds static struct usb_driver hub_driver = { 37201da177e4SLinus Torvalds .name = "hub", 37211da177e4SLinus Torvalds .probe = hub_probe, 37221da177e4SLinus Torvalds .disconnect = hub_disconnect, 37231da177e4SLinus Torvalds .suspend = hub_suspend, 37241da177e4SLinus Torvalds .resume = hub_resume, 3725f07600cfSAlan Stern .reset_resume = hub_reset_resume, 37267de18d8bSAlan Stern .pre_reset = hub_pre_reset, 37277de18d8bSAlan Stern .post_reset = hub_post_reset, 3728c532b29aSAndi Kleen .unlocked_ioctl = hub_ioctl, 37291da177e4SLinus Torvalds .id_table = hub_id_table, 373040f122f3SAlan Stern .supports_autosuspend = 1, 37311da177e4SLinus Torvalds }; 37321da177e4SLinus Torvalds 37331da177e4SLinus Torvalds int usb_hub_init(void) 37341da177e4SLinus Torvalds { 37351da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 37361da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 37371da177e4SLinus Torvalds usbcore_name); 37381da177e4SLinus Torvalds return -1; 37391da177e4SLinus Torvalds } 37401da177e4SLinus Torvalds 37419c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 37429c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 37431da177e4SLinus Torvalds return 0; 37441da177e4SLinus Torvalds 37451da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 37461da177e4SLinus Torvalds usb_deregister(&hub_driver); 37471da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 37481da177e4SLinus Torvalds 37491da177e4SLinus Torvalds return -1; 37501da177e4SLinus Torvalds } 37511da177e4SLinus Torvalds 37521da177e4SLinus Torvalds void usb_hub_cleanup(void) 37531da177e4SLinus Torvalds { 37549c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 37551da177e4SLinus Torvalds 37561da177e4SLinus Torvalds /* 37571da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 37581da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 37591da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 37601da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 37611da177e4SLinus Torvalds * individual hub resources. -greg 37621da177e4SLinus Torvalds */ 37631da177e4SLinus Torvalds usb_deregister(&hub_driver); 37641da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 37651da177e4SLinus Torvalds 3766eb764c4bSAlan Stern static int descriptors_changed(struct usb_device *udev, 3767eb764c4bSAlan Stern struct usb_device_descriptor *old_device_descriptor) 37681da177e4SLinus Torvalds { 3769eb764c4bSAlan Stern int changed = 0; 37701da177e4SLinus Torvalds unsigned index; 3771eb764c4bSAlan Stern unsigned serial_len = 0; 3772eb764c4bSAlan Stern unsigned len; 3773eb764c4bSAlan Stern unsigned old_length; 3774eb764c4bSAlan Stern int length; 3775eb764c4bSAlan Stern char *buf; 37761da177e4SLinus Torvalds 3777eb764c4bSAlan Stern if (memcmp(&udev->descriptor, old_device_descriptor, 3778eb764c4bSAlan Stern sizeof(*old_device_descriptor)) != 0) 3779eb764c4bSAlan Stern return 1; 3780eb764c4bSAlan Stern 3781eb764c4bSAlan Stern /* Since the idVendor, idProduct, and bcdDevice values in the 3782eb764c4bSAlan Stern * device descriptor haven't changed, we will assume the 3783eb764c4bSAlan Stern * Manufacturer and Product strings haven't changed either. 3784eb764c4bSAlan Stern * But the SerialNumber string could be different (e.g., a 3785eb764c4bSAlan Stern * different flash card of the same brand). 3786eb764c4bSAlan Stern */ 3787eb764c4bSAlan Stern if (udev->serial) 3788eb764c4bSAlan Stern serial_len = strlen(udev->serial) + 1; 3789eb764c4bSAlan Stern 3790eb764c4bSAlan Stern len = serial_len; 37911da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 3792eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 3793eb764c4bSAlan Stern len = max(len, old_length); 37941da177e4SLinus Torvalds } 3795eb764c4bSAlan Stern 37960cc1a51fSOliver Neukum buf = kmalloc(len, GFP_NOIO); 37971da177e4SLinus Torvalds if (buf == NULL) { 37981da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 37991da177e4SLinus Torvalds /* assume the worst */ 38001da177e4SLinus Torvalds return 1; 38011da177e4SLinus Torvalds } 38021da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 3803eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 38041da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 38051da177e4SLinus Torvalds old_length); 3806eb764c4bSAlan Stern if (length != old_length) { 38071da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 38081da177e4SLinus Torvalds index, length); 3809eb764c4bSAlan Stern changed = 1; 38101da177e4SLinus Torvalds break; 38111da177e4SLinus Torvalds } 38121da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 38131da177e4SLinus Torvalds != 0) { 38141da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 3815eb764c4bSAlan Stern index, 3816eb764c4bSAlan Stern ((struct usb_config_descriptor *) buf)-> 3817eb764c4bSAlan Stern bConfigurationValue); 3818eb764c4bSAlan Stern changed = 1; 38191da177e4SLinus Torvalds break; 38201da177e4SLinus Torvalds } 38211da177e4SLinus Torvalds } 3822eb764c4bSAlan Stern 3823eb764c4bSAlan Stern if (!changed && serial_len) { 3824eb764c4bSAlan Stern length = usb_string(udev, udev->descriptor.iSerialNumber, 3825eb764c4bSAlan Stern buf, serial_len); 3826eb764c4bSAlan Stern if (length + 1 != serial_len) { 3827eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string error %d\n", 3828eb764c4bSAlan Stern length); 3829eb764c4bSAlan Stern changed = 1; 3830eb764c4bSAlan Stern } else if (memcmp(buf, udev->serial, length) != 0) { 3831eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string changed\n"); 3832eb764c4bSAlan Stern changed = 1; 3833eb764c4bSAlan Stern } 3834eb764c4bSAlan Stern } 3835eb764c4bSAlan Stern 38361da177e4SLinus Torvalds kfree(buf); 3837eb764c4bSAlan Stern return changed; 38381da177e4SLinus Torvalds } 38391da177e4SLinus Torvalds 38401da177e4SLinus Torvalds /** 3841742120c6SMing Lei * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device 38421da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 38431da177e4SLinus Torvalds * 384479efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 384579efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 3846742120c6SMing Lei * Use usb_reset_device() instead. 38471da177e4SLinus Torvalds * 38481da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 38491da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 38501da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 38511da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 38521da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 38531da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 38541da177e4SLinus Torvalds * re-enumerated and probed all over again. 38551da177e4SLinus Torvalds * 38561da177e4SLinus Torvalds * Returns 0 if the reset succeeded, -ENODEV if the device has been 38571da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 38581da177e4SLinus Torvalds * if the reset wasn't even attempted. 38591da177e4SLinus Torvalds * 38601da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 38611da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 38621da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 38631da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 38646bc6cff5SAlan Stern * 38656bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 38666bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 38676bc6cff5SAlan Stern * holding the device lock because these tasks should always call 38686bc6cff5SAlan Stern * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. 38691da177e4SLinus Torvalds */ 3870742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev) 38711da177e4SLinus Torvalds { 38721da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 38731da177e4SLinus Torvalds struct usb_hub *parent_hub; 38743f0479e0SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 38751da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 387612c3da34SAlan Stern int i, ret = 0; 387712c3da34SAlan Stern int port1 = udev->portnum; 38781da177e4SLinus Torvalds 38791da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 38801da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 38811da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 38821da177e4SLinus Torvalds udev->state); 38831da177e4SLinus Torvalds return -EINVAL; 38841da177e4SLinus Torvalds } 38851da177e4SLinus Torvalds 38861da177e4SLinus Torvalds if (!parent_hdev) { 38874bec9917SWolfram Sang /* this requires hcd-specific logic; see ohci_restart() */ 3888441b62c1SHarvey Harrison dev_dbg(&udev->dev, "%s for root hub!\n", __func__); 38891da177e4SLinus Torvalds return -EISDIR; 38901da177e4SLinus Torvalds } 38911da177e4SLinus Torvalds parent_hub = hdev_to_hub(parent_hdev); 38921da177e4SLinus Torvalds 38931da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 38941da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 38951da177e4SLinus Torvalds 38961da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 38971da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 3898fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 38991da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 3900dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 39011da177e4SLinus Torvalds break; 39021da177e4SLinus Torvalds } 39031da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 3904d5cbad4bSAlan Stern 39051da177e4SLinus Torvalds if (ret < 0) 39061da177e4SLinus Torvalds goto re_enumerate; 39071da177e4SLinus Torvalds 39081da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 3909eb764c4bSAlan Stern if (descriptors_changed(udev, &descriptor)) { 39101da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 39111da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 39121da177e4SLinus Torvalds goto re_enumerate; 39131da177e4SLinus Torvalds } 39141da177e4SLinus Torvalds 39154fe0387aSAlan Stern /* Restore the device's previous configuration */ 39161da177e4SLinus Torvalds if (!udev->actconfig) 39171da177e4SLinus Torvalds goto done; 39183f0479e0SSarah Sharp 3919d673bfcbSSarah Sharp mutex_lock(hcd->bandwidth_mutex); 39203f0479e0SSarah Sharp ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); 39213f0479e0SSarah Sharp if (ret < 0) { 39223f0479e0SSarah Sharp dev_warn(&udev->dev, 39233f0479e0SSarah Sharp "Busted HC? Not enough HCD resources for " 39243f0479e0SSarah Sharp "old configuration.\n"); 3925d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 39263f0479e0SSarah Sharp goto re_enumerate; 39273f0479e0SSarah Sharp } 39281da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 39291da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 39301da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 39311da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 39321da177e4SLinus Torvalds if (ret < 0) { 39331da177e4SLinus Torvalds dev_err(&udev->dev, 39341da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 39351da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 3936d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 39371da177e4SLinus Torvalds goto re_enumerate; 39381da177e4SLinus Torvalds } 3939d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 39401da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 39411da177e4SLinus Torvalds 39424fe0387aSAlan Stern /* Put interfaces back into the same altsettings as before. 39434fe0387aSAlan Stern * Don't bother to send the Set-Interface request for interfaces 39444fe0387aSAlan Stern * that were already in altsetting 0; besides being unnecessary, 39454fe0387aSAlan Stern * many devices can't handle it. Instead just reset the host-side 39464fe0387aSAlan Stern * endpoint state. 39474fe0387aSAlan Stern */ 39481da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 39493f0479e0SSarah Sharp struct usb_host_config *config = udev->actconfig; 39503f0479e0SSarah Sharp struct usb_interface *intf = config->interface[i]; 39511da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 39521da177e4SLinus Torvalds 39531da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 39544fe0387aSAlan Stern if (desc->bAlternateSetting == 0) { 39554fe0387aSAlan Stern usb_disable_interface(udev, intf, true); 39564fe0387aSAlan Stern usb_enable_interface(udev, intf, true); 39574fe0387aSAlan Stern ret = 0; 39584fe0387aSAlan Stern } else { 395904a723eaSSarah Sharp /* Let the bandwidth allocation function know that this 396004a723eaSSarah Sharp * device has been reset, and it will have to use 396104a723eaSSarah Sharp * alternate setting 0 as the current alternate setting. 39623f0479e0SSarah Sharp */ 396304a723eaSSarah Sharp intf->resetting_device = 1; 39641da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 39651da177e4SLinus Torvalds desc->bAlternateSetting); 396604a723eaSSarah Sharp intf->resetting_device = 0; 39674fe0387aSAlan Stern } 39681da177e4SLinus Torvalds if (ret < 0) { 39691da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 39701da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 39711da177e4SLinus Torvalds desc->bInterfaceNumber, 39721da177e4SLinus Torvalds desc->bAlternateSetting, 39731da177e4SLinus Torvalds ret); 39741da177e4SLinus Torvalds goto re_enumerate; 39751da177e4SLinus Torvalds } 39761da177e4SLinus Torvalds } 39771da177e4SLinus Torvalds 39781da177e4SLinus Torvalds done: 39791da177e4SLinus Torvalds return 0; 39801da177e4SLinus Torvalds 39811da177e4SLinus Torvalds re_enumerate: 39821da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 39831da177e4SLinus Torvalds return -ENODEV; 39841da177e4SLinus Torvalds } 398579efa097SAlan Stern 398679efa097SAlan Stern /** 3987742120c6SMing Lei * usb_reset_device - warn interface drivers and perform a USB port reset 398879efa097SAlan Stern * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 398979efa097SAlan Stern * 399079efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 399179efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 399279efa097SAlan Stern * the reset is over (using their post_reset method). 399379efa097SAlan Stern * 3994742120c6SMing Lei * Return value is the same as for usb_reset_and_verify_device(). 399579efa097SAlan Stern * 399679efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 399779efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 399879efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 399979efa097SAlan Stern * the device using usb_lock_device_for_reset(). 400078d9a487SAlan Stern * 400178d9a487SAlan Stern * If an interface is currently being probed or disconnected, we assume 400278d9a487SAlan Stern * its driver knows how to handle resets. For all other interfaces, 400378d9a487SAlan Stern * if the driver doesn't have pre_reset and post_reset methods then 400478d9a487SAlan Stern * we attempt to unbind it and rebind afterward. 400579efa097SAlan Stern */ 4006742120c6SMing Lei int usb_reset_device(struct usb_device *udev) 400779efa097SAlan Stern { 400879efa097SAlan Stern int ret; 4009852c4b43SAlan Stern int i; 401079efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 401179efa097SAlan Stern 401279efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 401379efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 401479efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 401579efa097SAlan Stern udev->state); 401679efa097SAlan Stern return -EINVAL; 401779efa097SAlan Stern } 401879efa097SAlan Stern 4019645daaabSAlan Stern /* Prevent autosuspend during the reset */ 402094fcda1fSAlan Stern usb_autoresume_device(udev); 4021645daaabSAlan Stern 402279efa097SAlan Stern if (config) { 4023852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 4024852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 402579efa097SAlan Stern struct usb_driver *drv; 402678d9a487SAlan Stern int unbind = 0; 402779efa097SAlan Stern 4028852c4b43SAlan Stern if (cintf->dev.driver) { 402979efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 403078d9a487SAlan Stern if (drv->pre_reset && drv->post_reset) 403178d9a487SAlan Stern unbind = (drv->pre_reset)(cintf); 403278d9a487SAlan Stern else if (cintf->condition == 403378d9a487SAlan Stern USB_INTERFACE_BOUND) 403478d9a487SAlan Stern unbind = 1; 403578d9a487SAlan Stern if (unbind) 403678d9a487SAlan Stern usb_forced_unbind_intf(cintf); 403779efa097SAlan Stern } 403879efa097SAlan Stern } 403979efa097SAlan Stern } 404079efa097SAlan Stern 4041742120c6SMing Lei ret = usb_reset_and_verify_device(udev); 404279efa097SAlan Stern 404379efa097SAlan Stern if (config) { 4044852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 4045852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 404679efa097SAlan Stern struct usb_driver *drv; 404778d9a487SAlan Stern int rebind = cintf->needs_binding; 404879efa097SAlan Stern 404978d9a487SAlan Stern if (!rebind && cintf->dev.driver) { 405079efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 405179efa097SAlan Stern if (drv->post_reset) 405278d9a487SAlan Stern rebind = (drv->post_reset)(cintf); 405378d9a487SAlan Stern else if (cintf->condition == 405478d9a487SAlan Stern USB_INTERFACE_BOUND) 405578d9a487SAlan Stern rebind = 1; 405679efa097SAlan Stern } 40576c640945SAlan Stern if (ret == 0 && rebind) 405878d9a487SAlan Stern usb_rebind_intf(cintf); 405979efa097SAlan Stern } 406079efa097SAlan Stern } 406179efa097SAlan Stern 406294fcda1fSAlan Stern usb_autosuspend_device(udev); 406379efa097SAlan Stern return ret; 406479efa097SAlan Stern } 4065742120c6SMing Lei EXPORT_SYMBOL_GPL(usb_reset_device); 4066dc023dceSInaky Perez-Gonzalez 4067dc023dceSInaky Perez-Gonzalez 4068dc023dceSInaky Perez-Gonzalez /** 4069dc023dceSInaky Perez-Gonzalez * usb_queue_reset_device - Reset a USB device from an atomic context 4070dc023dceSInaky Perez-Gonzalez * @iface: USB interface belonging to the device to reset 4071dc023dceSInaky Perez-Gonzalez * 4072dc023dceSInaky Perez-Gonzalez * This function can be used to reset a USB device from an atomic 4073dc023dceSInaky Perez-Gonzalez * context, where usb_reset_device() won't work (as it blocks). 4074dc023dceSInaky Perez-Gonzalez * 4075dc023dceSInaky Perez-Gonzalez * Doing a reset via this method is functionally equivalent to calling 4076dc023dceSInaky Perez-Gonzalez * usb_reset_device(), except for the fact that it is delayed to a 4077dc023dceSInaky Perez-Gonzalez * workqueue. This means that any drivers bound to other interfaces 4078dc023dceSInaky Perez-Gonzalez * might be unbound, as well as users from usbfs in user space. 4079dc023dceSInaky Perez-Gonzalez * 4080dc023dceSInaky Perez-Gonzalez * Corner cases: 4081dc023dceSInaky Perez-Gonzalez * 4082dc023dceSInaky Perez-Gonzalez * - Scheduling two resets at the same time from two different drivers 4083dc023dceSInaky Perez-Gonzalez * attached to two different interfaces of the same device is 4084dc023dceSInaky Perez-Gonzalez * possible; depending on how the driver attached to each interface 4085dc023dceSInaky Perez-Gonzalez * handles ->pre_reset(), the second reset might happen or not. 4086dc023dceSInaky Perez-Gonzalez * 4087dc023dceSInaky Perez-Gonzalez * - If a driver is unbound and it had a pending reset, the reset will 4088dc023dceSInaky Perez-Gonzalez * be cancelled. 4089dc023dceSInaky Perez-Gonzalez * 4090dc023dceSInaky Perez-Gonzalez * - This function can be called during .probe() or .disconnect() 4091dc023dceSInaky Perez-Gonzalez * times. On return from .disconnect(), any pending resets will be 4092dc023dceSInaky Perez-Gonzalez * cancelled. 4093dc023dceSInaky Perez-Gonzalez * 4094dc023dceSInaky Perez-Gonzalez * There is no no need to lock/unlock the @reset_ws as schedule_work() 4095dc023dceSInaky Perez-Gonzalez * does its own. 4096dc023dceSInaky Perez-Gonzalez * 4097dc023dceSInaky Perez-Gonzalez * NOTE: We don't do any reference count tracking because it is not 4098dc023dceSInaky Perez-Gonzalez * needed. The lifecycle of the work_struct is tied to the 4099dc023dceSInaky Perez-Gonzalez * usb_interface. Before destroying the interface we cancel the 4100dc023dceSInaky Perez-Gonzalez * work_struct, so the fact that work_struct is queued and or 4101dc023dceSInaky Perez-Gonzalez * running means the interface (and thus, the device) exist and 4102dc023dceSInaky Perez-Gonzalez * are referenced. 4103dc023dceSInaky Perez-Gonzalez */ 4104dc023dceSInaky Perez-Gonzalez void usb_queue_reset_device(struct usb_interface *iface) 4105dc023dceSInaky Perez-Gonzalez { 4106dc023dceSInaky Perez-Gonzalez schedule_work(&iface->reset_ws); 4107dc023dceSInaky Perez-Gonzalez } 4108dc023dceSInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_queue_reset_device); 4109