11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * USB hub driver. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * (C) Copyright 1999 Linus Torvalds 51da177e4SLinus Torvalds * (C) Copyright 1999 Johannes Erdfelt 61da177e4SLinus Torvalds * (C) Copyright 1999 Gregory P. Smith 71da177e4SLinus Torvalds * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds 111da177e4SLinus Torvalds #include <linux/kernel.h> 121da177e4SLinus Torvalds #include <linux/errno.h> 131da177e4SLinus Torvalds #include <linux/module.h> 141da177e4SLinus Torvalds #include <linux/moduleparam.h> 151da177e4SLinus Torvalds #include <linux/completion.h> 161da177e4SLinus Torvalds #include <linux/sched.h> 171da177e4SLinus Torvalds #include <linux/list.h> 181da177e4SLinus Torvalds #include <linux/slab.h> 191da177e4SLinus Torvalds #include <linux/ioctl.h> 201da177e4SLinus Torvalds #include <linux/usb.h> 211da177e4SLinus Torvalds #include <linux/usbdevice_fs.h> 229c8d6178Sakpm@osdl.org #include <linux/kthread.h> 234186ecf8SArjan van de Ven #include <linux/mutex.h> 247dfb7103SNigel Cunningham #include <linux/freezer.h> 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #include <asm/uaccess.h> 271da177e4SLinus Torvalds #include <asm/byteorder.h> 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds #include "usb.h" 301da177e4SLinus Torvalds #include "hcd.h" 311da177e4SLinus Torvalds #include "hub.h" 321da177e4SLinus Torvalds 33f2a383e4SGreg Kroah-Hartman /* if we are in debug mode, always announce new devices */ 34f2a383e4SGreg Kroah-Hartman #ifdef DEBUG 35f2a383e4SGreg Kroah-Hartman #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES 36f2a383e4SGreg Kroah-Hartman #define CONFIG_USB_ANNOUNCE_NEW_DEVICES 37f2a383e4SGreg Kroah-Hartman #endif 38f2a383e4SGreg Kroah-Hartman #endif 39f2a383e4SGreg Kroah-Hartman 401bb5f66bSAlan Stern struct usb_hub { 411bb5f66bSAlan Stern struct device *intfdev; /* the "interface" device */ 421bb5f66bSAlan Stern struct usb_device *hdev; 43e8054854SAlan Stern struct kref kref; 441bb5f66bSAlan Stern struct urb *urb; /* for interrupt polling pipe */ 451bb5f66bSAlan Stern 461bb5f66bSAlan Stern /* buffer for urb ... with extra space in case of babble */ 471bb5f66bSAlan Stern char (*buffer)[8]; 481bb5f66bSAlan Stern dma_addr_t buffer_dma; /* DMA address for buffer */ 491bb5f66bSAlan Stern union { 501bb5f66bSAlan Stern struct usb_hub_status hub; 511bb5f66bSAlan Stern struct usb_port_status port; 521bb5f66bSAlan Stern } *status; /* buffer for status reports */ 53db90e7a1SAlan Stern struct mutex status_mutex; /* for the status buffer */ 541bb5f66bSAlan Stern 551bb5f66bSAlan Stern int error; /* last reported error */ 561bb5f66bSAlan Stern int nerrors; /* track consecutive errors */ 571bb5f66bSAlan Stern 581bb5f66bSAlan Stern struct list_head event_list; /* hubs w/data or errs ready */ 591bb5f66bSAlan Stern unsigned long event_bits[1]; /* status change bitmask */ 601bb5f66bSAlan Stern unsigned long change_bits[1]; /* ports with logical connect 611bb5f66bSAlan Stern status change */ 621bb5f66bSAlan Stern unsigned long busy_bits[1]; /* ports being reset or 631bb5f66bSAlan Stern resumed */ 641bb5f66bSAlan Stern #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ 651bb5f66bSAlan Stern #error event_bits[] is too short! 661bb5f66bSAlan Stern #endif 671bb5f66bSAlan Stern 681bb5f66bSAlan Stern struct usb_hub_descriptor *descriptor; /* class descriptor */ 691bb5f66bSAlan Stern struct usb_tt tt; /* Transaction Translator */ 701bb5f66bSAlan Stern 711bb5f66bSAlan Stern unsigned mA_per_port; /* current for each child */ 721bb5f66bSAlan Stern 731bb5f66bSAlan Stern unsigned limited_power:1; 741bb5f66bSAlan Stern unsigned quiescing:1; 75e8054854SAlan Stern unsigned disconnected:1; 761bb5f66bSAlan Stern 771bb5f66bSAlan Stern unsigned has_indicators:1; 781bb5f66bSAlan Stern u8 indicator[USB_MAXCHILDREN]; 796d5aefb8SDavid Howells struct delayed_work leds; 808520f380SAlan Stern struct delayed_work init_work; 817cbe5dcaSAlan Stern void **port_owners; 821bb5f66bSAlan Stern }; 831bb5f66bSAlan Stern 841bb5f66bSAlan Stern 851da177e4SLinus Torvalds /* Protect struct usb_device->state and ->children members 869ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 871da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 881da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds /* khubd's worklist and its lock */ 911da177e4SLinus Torvalds static DEFINE_SPINLOCK(hub_event_lock); 921da177e4SLinus Torvalds static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds /* Wakes up khubd */ 951da177e4SLinus Torvalds static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); 961da177e4SLinus Torvalds 979c8d6178Sakpm@osdl.org static struct task_struct *khubd_task; 981da177e4SLinus Torvalds 991da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 1001da177e4SLinus Torvalds static int blinkenlights = 0; 1011da177e4SLinus Torvalds module_param (blinkenlights, bool, S_IRUGO); 1021da177e4SLinus Torvalds MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds /* 105fd7c519dSJaroslav Kysela * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about 106fd7c519dSJaroslav Kysela * 10 seconds to send reply for the initial 64-byte descriptor request. 107fd7c519dSJaroslav Kysela */ 108fd7c519dSJaroslav Kysela /* define initial 64-byte descriptor request timeout in milliseconds */ 109fd7c519dSJaroslav Kysela static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; 110fd7c519dSJaroslav Kysela module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); 111b9cef6c3SWu Fengguang MODULE_PARM_DESC(initial_descriptor_timeout, 112b9cef6c3SWu Fengguang "initial 64-byte descriptor request timeout in milliseconds " 113b9cef6c3SWu Fengguang "(default 5000 - 5.0 seconds)"); 114fd7c519dSJaroslav Kysela 115fd7c519dSJaroslav Kysela /* 1161da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 1171da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 1181da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 1191da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 1201da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 1211da177e4SLinus Torvalds * following module parameters. 1221da177e4SLinus Torvalds * 1231da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 1241da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 1251da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 1261da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 1271da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 1281da177e4SLinus Torvalds */ 1291da177e4SLinus Torvalds static int old_scheme_first = 0; 1301da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 1311da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 1321da177e4SLinus Torvalds "start with the old device initialization scheme"); 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds static int use_both_schemes = 1; 1351da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 1361da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 1371da177e4SLinus Torvalds "try the other device initialization scheme if the " 1381da177e4SLinus Torvalds "first one fails"); 1391da177e4SLinus Torvalds 14032fe0198SAlan Stern /* Mutual exclusion for EHCI CF initialization. This interferes with 14132fe0198SAlan Stern * port reset on some companion controllers. 14232fe0198SAlan Stern */ 14332fe0198SAlan Stern DECLARE_RWSEM(ehci_cf_port_reset_rwsem); 14432fe0198SAlan Stern EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); 14532fe0198SAlan Stern 146948fea37SAlan Stern #define HUB_DEBOUNCE_TIMEOUT 1500 147948fea37SAlan Stern #define HUB_DEBOUNCE_STEP 25 148948fea37SAlan Stern #define HUB_DEBOUNCE_STABLE 100 149948fea37SAlan Stern 1501da177e4SLinus Torvalds 151742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev); 152742120c6SMing Lei 1531da177e4SLinus Torvalds static inline char *portspeed(int portstatus) 1541da177e4SLinus Torvalds { 1551da177e4SLinus Torvalds if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) 1561da177e4SLinus Torvalds return "480 Mb/s"; 1571da177e4SLinus Torvalds else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) 1581da177e4SLinus Torvalds return "1.5 Mb/s"; 159d2e9b4d6SSarah Sharp else if (portstatus & (1 << USB_PORT_FEAT_SUPERSPEED)) 160d2e9b4d6SSarah Sharp return "5.0 Gb/s"; 1611da177e4SLinus Torvalds else 1621da177e4SLinus Torvalds return "12 Mb/s"; 1631da177e4SLinus Torvalds } 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 16625118084SAlan Stern static struct usb_hub *hdev_to_hub(struct usb_device *hdev) 1671da177e4SLinus Torvalds { 16825118084SAlan Stern if (!hdev || !hdev->actconfig) 16925118084SAlan Stern return NULL; 1701da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1711da177e4SLinus Torvalds } 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 1741da177e4SLinus Torvalds static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) 1751da177e4SLinus Torvalds { 1761da177e4SLinus Torvalds int i, ret; 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 1791da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 1801da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 1811da177e4SLinus Torvalds USB_DT_HUB << 8, 0, data, size, 1821da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 1831da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 1841da177e4SLinus Torvalds return ret; 1851da177e4SLinus Torvalds } 1861da177e4SLinus Torvalds return -EINVAL; 1871da177e4SLinus Torvalds } 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds /* 1901da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 1911da177e4SLinus Torvalds */ 1921da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 1931da177e4SLinus Torvalds { 1941da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1951da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 1961da177e4SLinus Torvalds } 1971da177e4SLinus Torvalds 1981da177e4SLinus Torvalds /* 1991da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 2001da177e4SLinus Torvalds */ 2011da177e4SLinus Torvalds static int clear_port_feature(struct usb_device *hdev, int port1, int feature) 2021da177e4SLinus Torvalds { 2031da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 2041da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 2051da177e4SLinus Torvalds NULL, 0, 1000); 2061da177e4SLinus Torvalds } 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds /* 2091da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 2101da177e4SLinus Torvalds */ 2111da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 2121da177e4SLinus Torvalds { 2131da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 2141da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 2151da177e4SLinus Torvalds NULL, 0, 1000); 2161da177e4SLinus Torvalds } 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds /* 2191da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 2201da177e4SLinus Torvalds * for info about using port indicators 2211da177e4SLinus Torvalds */ 2221da177e4SLinus Torvalds static void set_port_led( 2231da177e4SLinus Torvalds struct usb_hub *hub, 2241da177e4SLinus Torvalds int port1, 2251da177e4SLinus Torvalds int selector 2261da177e4SLinus Torvalds ) 2271da177e4SLinus Torvalds { 2281da177e4SLinus Torvalds int status = set_port_feature(hub->hdev, (selector << 8) | port1, 2291da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 2301da177e4SLinus Torvalds if (status < 0) 2311da177e4SLinus Torvalds dev_dbg (hub->intfdev, 2321da177e4SLinus Torvalds "port %d indicator %s status %d\n", 2331da177e4SLinus Torvalds port1, 2341da177e4SLinus Torvalds ({ char *s; switch (selector) { 2351da177e4SLinus Torvalds case HUB_LED_AMBER: s = "amber"; break; 2361da177e4SLinus Torvalds case HUB_LED_GREEN: s = "green"; break; 2371da177e4SLinus Torvalds case HUB_LED_OFF: s = "off"; break; 2381da177e4SLinus Torvalds case HUB_LED_AUTO: s = "auto"; break; 2391da177e4SLinus Torvalds default: s = "??"; break; 2401da177e4SLinus Torvalds }; s; }), 2411da177e4SLinus Torvalds status); 2421da177e4SLinus Torvalds } 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 2451da177e4SLinus Torvalds 246c4028958SDavid Howells static void led_work (struct work_struct *work) 2471da177e4SLinus Torvalds { 248c4028958SDavid Howells struct usb_hub *hub = 249c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 2501da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 2511da177e4SLinus Torvalds unsigned i; 2521da177e4SLinus Torvalds unsigned changed = 0; 2531da177e4SLinus Torvalds int cursor = -1; 2541da177e4SLinus Torvalds 2551da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 2561da177e4SLinus Torvalds return; 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds for (i = 0; i < hub->descriptor->bNbrPorts; i++) { 2591da177e4SLinus Torvalds unsigned selector, mode; 2601da177e4SLinus Torvalds 2611da177e4SLinus Torvalds /* 30%-50% duty cycle */ 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds switch (hub->indicator[i]) { 2641da177e4SLinus Torvalds /* cycle marker */ 2651da177e4SLinus Torvalds case INDICATOR_CYCLE: 2661da177e4SLinus Torvalds cursor = i; 2671da177e4SLinus Torvalds selector = HUB_LED_AUTO; 2681da177e4SLinus Torvalds mode = INDICATOR_AUTO; 2691da177e4SLinus Torvalds break; 2701da177e4SLinus Torvalds /* blinking green = sw attention */ 2711da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 2721da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2731da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 2741da177e4SLinus Torvalds break; 2751da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 2761da177e4SLinus Torvalds selector = HUB_LED_OFF; 2771da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 2781da177e4SLinus Torvalds break; 2791da177e4SLinus Torvalds /* blinking amber = hw attention */ 2801da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 2811da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2821da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 2831da177e4SLinus Torvalds break; 2841da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 2851da177e4SLinus Torvalds selector = HUB_LED_OFF; 2861da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 2871da177e4SLinus Torvalds break; 2881da177e4SLinus Torvalds /* blink green/amber = reserved */ 2891da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 2901da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2911da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 2921da177e4SLinus Torvalds break; 2931da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 2941da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2951da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 2961da177e4SLinus Torvalds break; 2971da177e4SLinus Torvalds default: 2981da177e4SLinus Torvalds continue; 2991da177e4SLinus Torvalds } 3001da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 3011da177e4SLinus Torvalds changed = 1; 3021da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 3031da177e4SLinus Torvalds hub->indicator[i] = mode; 3041da177e4SLinus Torvalds } 3051da177e4SLinus Torvalds if (!changed && blinkenlights) { 3061da177e4SLinus Torvalds cursor++; 3071da177e4SLinus Torvalds cursor %= hub->descriptor->bNbrPorts; 3081da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 3091da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 3101da177e4SLinus Torvalds changed++; 3111da177e4SLinus Torvalds } 3121da177e4SLinus Torvalds if (changed) 3131da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 3141da177e4SLinus Torvalds } 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 3171da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 3181da177e4SLinus Torvalds #define USB_STS_RETRIES 5 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds /* 3211da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 3221da177e4SLinus Torvalds */ 3231da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 3241da177e4SLinus Torvalds struct usb_hub_status *data) 3251da177e4SLinus Torvalds { 3261da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 3291da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3301da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 3311da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 3321da177e4SLinus Torvalds } 3331da177e4SLinus Torvalds return status; 3341da177e4SLinus Torvalds } 3351da177e4SLinus Torvalds 3361da177e4SLinus Torvalds /* 3371da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 3381da177e4SLinus Torvalds */ 3391da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 3401da177e4SLinus Torvalds struct usb_port_status *data) 3411da177e4SLinus Torvalds { 3421da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 3451da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3461da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 3471da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 3481da177e4SLinus Torvalds } 3491da177e4SLinus Torvalds return status; 3501da177e4SLinus Torvalds } 3511da177e4SLinus Torvalds 3523eb14915SAlan Stern static int hub_port_status(struct usb_hub *hub, int port1, 3533eb14915SAlan Stern u16 *status, u16 *change) 3543eb14915SAlan Stern { 3553eb14915SAlan Stern int ret; 3563eb14915SAlan Stern 3573eb14915SAlan Stern mutex_lock(&hub->status_mutex); 3583eb14915SAlan Stern ret = get_port_status(hub->hdev, port1, &hub->status->port); 3593eb14915SAlan Stern if (ret < 4) { 3603eb14915SAlan Stern dev_err(hub->intfdev, 3613eb14915SAlan Stern "%s failed (err = %d)\n", __func__, ret); 3623eb14915SAlan Stern if (ret >= 0) 3633eb14915SAlan Stern ret = -EIO; 3643eb14915SAlan Stern } else { 3653eb14915SAlan Stern *status = le16_to_cpu(hub->status->port.wPortStatus); 3663eb14915SAlan Stern *change = le16_to_cpu(hub->status->port.wPortChange); 3673eb14915SAlan Stern ret = 0; 3683eb14915SAlan Stern } 3693eb14915SAlan Stern mutex_unlock(&hub->status_mutex); 3703eb14915SAlan Stern return ret; 3713eb14915SAlan Stern } 3723eb14915SAlan Stern 3731da177e4SLinus Torvalds static void kick_khubd(struct usb_hub *hub) 3741da177e4SLinus Torvalds { 3751da177e4SLinus Torvalds unsigned long flags; 3761da177e4SLinus Torvalds 37740f122f3SAlan Stern /* Suppress autosuspend until khubd runs */ 378ccf5b801SAlan Stern atomic_set(&to_usb_interface(hub->intfdev)->pm_usage_cnt, 1); 37940f122f3SAlan Stern 3801da177e4SLinus Torvalds spin_lock_irqsave(&hub_event_lock, flags); 3812e2c5eeaSRoel Kluin if (!hub->disconnected && list_empty(&hub->event_list)) { 3821da177e4SLinus Torvalds list_add_tail(&hub->event_list, &hub_event_list); 3831da177e4SLinus Torvalds wake_up(&khubd_wait); 3841da177e4SLinus Torvalds } 3851da177e4SLinus Torvalds spin_unlock_irqrestore(&hub_event_lock, flags); 3861da177e4SLinus Torvalds } 3871da177e4SLinus Torvalds 3881da177e4SLinus Torvalds void usb_kick_khubd(struct usb_device *hdev) 3891da177e4SLinus Torvalds { 39025118084SAlan Stern struct usb_hub *hub = hdev_to_hub(hdev); 39125118084SAlan Stern 39225118084SAlan Stern if (hub) 39325118084SAlan Stern kick_khubd(hub); 3941da177e4SLinus Torvalds } 3951da177e4SLinus Torvalds 3961da177e4SLinus Torvalds 3971da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 3987d12e780SDavid Howells static void hub_irq(struct urb *urb) 3991da177e4SLinus Torvalds { 400ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 401e015268dSAlan Stern int status = urb->status; 40271d2718fSRoel Kluin unsigned i; 4031da177e4SLinus Torvalds unsigned long bits; 4041da177e4SLinus Torvalds 405e015268dSAlan Stern switch (status) { 4061da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 4071da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 4081da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 4091da177e4SLinus Torvalds return; 4101da177e4SLinus Torvalds 4111da177e4SLinus Torvalds default: /* presumably an error */ 4121da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 413e015268dSAlan Stern dev_dbg (hub->intfdev, "transfer --> %d\n", status); 4141da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 4151da177e4SLinus Torvalds goto resubmit; 416e015268dSAlan Stern hub->error = status; 4171da177e4SLinus Torvalds /* FALL THROUGH */ 4181da177e4SLinus Torvalds 4191da177e4SLinus Torvalds /* let khubd handle things */ 4201da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 4211da177e4SLinus Torvalds bits = 0; 4221da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 4231da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 4241da177e4SLinus Torvalds << (i*8); 4251da177e4SLinus Torvalds hub->event_bits[0] = bits; 4261da177e4SLinus Torvalds break; 4271da177e4SLinus Torvalds } 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds hub->nerrors = 0; 4301da177e4SLinus Torvalds 4311da177e4SLinus Torvalds /* Something happened, let khubd figure it out */ 4321da177e4SLinus Torvalds kick_khubd(hub); 4331da177e4SLinus Torvalds 4341da177e4SLinus Torvalds resubmit: 4351da177e4SLinus Torvalds if (hub->quiescing) 4361da177e4SLinus Torvalds return; 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 4391da177e4SLinus Torvalds && status != -ENODEV && status != -EPERM) 4401da177e4SLinus Torvalds dev_err (hub->intfdev, "resubmit --> %d\n", status); 4411da177e4SLinus Torvalds } 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 4441da177e4SLinus Torvalds static inline int 4451da177e4SLinus Torvalds hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) 4461da177e4SLinus Torvalds { 4471da177e4SLinus Torvalds return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 4481da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 4491da177e4SLinus Torvalds tt, NULL, 0, 1000); 4501da177e4SLinus Torvalds } 4511da177e4SLinus Torvalds 4521da177e4SLinus Torvalds /* 4531da177e4SLinus Torvalds * enumeration blocks khubd for a long time. we use keventd instead, since 4541da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 4551da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 4561da177e4SLinus Torvalds * both can talk to the same hub concurrently. 4571da177e4SLinus Torvalds */ 458cb88a1b8SAlan Stern static void hub_tt_work(struct work_struct *work) 4591da177e4SLinus Torvalds { 460c4028958SDavid Howells struct usb_hub *hub = 461cb88a1b8SAlan Stern container_of(work, struct usb_hub, tt.clear_work); 4621da177e4SLinus Torvalds unsigned long flags; 46355e5fdfaSMark Lord int limit = 100; 4641da177e4SLinus Torvalds 4651da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 46655e5fdfaSMark Lord while (--limit && !list_empty (&hub->tt.clear_list)) { 467d0f830d3SH Hartley Sweeten struct list_head *next; 4681da177e4SLinus Torvalds struct usb_tt_clear *clear; 4691da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 470cb88a1b8SAlan Stern const struct hc_driver *drv; 4711da177e4SLinus Torvalds int status; 4721da177e4SLinus Torvalds 473d0f830d3SH Hartley Sweeten next = hub->tt.clear_list.next; 474d0f830d3SH Hartley Sweeten clear = list_entry (next, struct usb_tt_clear, clear_list); 4751da177e4SLinus Torvalds list_del (&clear->clear_list); 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 4781da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 4791da177e4SLinus Torvalds status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 4801da177e4SLinus Torvalds if (status) 4811da177e4SLinus Torvalds dev_err (&hdev->dev, 4821da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 4831da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 484cb88a1b8SAlan Stern 485cb88a1b8SAlan Stern /* Tell the HCD, even if the operation failed */ 486cb88a1b8SAlan Stern drv = clear->hcd->driver; 487cb88a1b8SAlan Stern if (drv->clear_tt_buffer_complete) 488cb88a1b8SAlan Stern (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); 489cb88a1b8SAlan Stern 4901da177e4SLinus Torvalds kfree(clear); 491cb88a1b8SAlan Stern spin_lock_irqsave(&hub->tt.lock, flags); 4921da177e4SLinus Torvalds } 4931da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 4941da177e4SLinus Torvalds } 4951da177e4SLinus Torvalds 4961da177e4SLinus Torvalds /** 497cb88a1b8SAlan Stern * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub 498cb88a1b8SAlan Stern * @urb: an URB associated with the failed or incomplete split transaction 4991da177e4SLinus Torvalds * 5001da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 5011da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 5021da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 5031da177e4SLinus Torvalds * interrupt context. 5041da177e4SLinus Torvalds * 5051da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 5061da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 5071da177e4SLinus Torvalds */ 508cb88a1b8SAlan Stern int usb_hub_clear_tt_buffer(struct urb *urb) 5091da177e4SLinus Torvalds { 510cb88a1b8SAlan Stern struct usb_device *udev = urb->dev; 511cb88a1b8SAlan Stern int pipe = urb->pipe; 5121da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 5131da177e4SLinus Torvalds unsigned long flags; 5141da177e4SLinus Torvalds struct usb_tt_clear *clear; 5151da177e4SLinus Torvalds 5161da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 5171da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 5181da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 5191da177e4SLinus Torvalds */ 52054e6ecb2SChristoph Lameter if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { 5211da177e4SLinus Torvalds dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 5221da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 523cb88a1b8SAlan Stern return -ENOMEM; 5241da177e4SLinus Torvalds } 5251da177e4SLinus Torvalds 5261da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 5271da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 5281da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 5291da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 5301da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol (pipe) 5311da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 5321da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 5331da177e4SLinus Torvalds if (usb_pipein (pipe)) 5341da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 5351da177e4SLinus Torvalds 536cb88a1b8SAlan Stern /* info for completion callback */ 537cb88a1b8SAlan Stern clear->hcd = bus_to_hcd(udev->bus); 538cb88a1b8SAlan Stern clear->ep = urb->ep; 539cb88a1b8SAlan Stern 5401da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 5411da177e4SLinus Torvalds spin_lock_irqsave (&tt->lock, flags); 5421da177e4SLinus Torvalds list_add_tail (&clear->clear_list, &tt->clear_list); 543cb88a1b8SAlan Stern schedule_work(&tt->clear_work); 5441da177e4SLinus Torvalds spin_unlock_irqrestore (&tt->lock, flags); 545cb88a1b8SAlan Stern return 0; 5461da177e4SLinus Torvalds } 547cb88a1b8SAlan Stern EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); 5481da177e4SLinus Torvalds 5498520f380SAlan Stern /* If do_delay is false, return the number of milliseconds the caller 5508520f380SAlan Stern * needs to delay. 5518520f380SAlan Stern */ 5528520f380SAlan Stern static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) 5531da177e4SLinus Torvalds { 5541da177e4SLinus Torvalds int port1; 555b789696aSDavid Brownell unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 5568520f380SAlan Stern unsigned delay; 5574489a571SAlan Stern u16 wHubCharacteristics = 5584489a571SAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 5591da177e4SLinus Torvalds 5604489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 5614489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 5624489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 5634489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 5644489a571SAlan Stern * unless we send these messages to the hub. 5654489a571SAlan Stern */ 5664489a571SAlan Stern if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) 5671da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 5684489a571SAlan Stern else 5694489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 5704489a571SAlan Stern "non-switchable hub\n"); 5711da177e4SLinus Torvalds for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) 5724489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 5731da177e4SLinus Torvalds 574b789696aSDavid Brownell /* Wait at least 100 msec for power to become stable */ 5758520f380SAlan Stern delay = max(pgood_delay, (unsigned) 100); 5768520f380SAlan Stern if (do_delay) 5778520f380SAlan Stern msleep(delay); 5788520f380SAlan Stern return delay; 5791da177e4SLinus Torvalds } 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 5821da177e4SLinus Torvalds u16 *status, u16 *change) 5831da177e4SLinus Torvalds { 5841da177e4SLinus Torvalds int ret; 5851da177e4SLinus Torvalds 586db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 5871da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 5881da177e4SLinus Torvalds if (ret < 0) 5891da177e4SLinus Torvalds dev_err (hub->intfdev, 590441b62c1SHarvey Harrison "%s failed (err = %d)\n", __func__, ret); 5911da177e4SLinus Torvalds else { 5921da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 5931da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 5941da177e4SLinus Torvalds ret = 0; 5951da177e4SLinus Torvalds } 596db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 5971da177e4SLinus Torvalds return ret; 5981da177e4SLinus Torvalds } 5991da177e4SLinus Torvalds 6008b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 6018b28c752SAlan Stern { 6028b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 6030458d5b4SAlan Stern int ret = 0; 6048b28c752SAlan Stern 6050458d5b4SAlan Stern if (hdev->children[port1-1] && set_state) 6068b28c752SAlan Stern usb_set_device_state(hdev->children[port1-1], 6078b28c752SAlan Stern USB_STATE_NOTATTACHED); 6080458d5b4SAlan Stern if (!hub->error) 6098b28c752SAlan Stern ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); 6108b28c752SAlan Stern if (ret) 6118b28c752SAlan Stern dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 6128b28c752SAlan Stern port1, ret); 6138b28c752SAlan Stern return ret; 6148b28c752SAlan Stern } 6158b28c752SAlan Stern 6160458d5b4SAlan Stern /* 6170458d5b4SAlan Stern * Disable a port and mark a logical connnect-change event, so that some 6180458d5b4SAlan Stern * time later khubd will disconnect() any existing usb_device on the port 6190458d5b4SAlan Stern * and will re-enumerate if there actually is a device attached. 6200458d5b4SAlan Stern */ 6210458d5b4SAlan Stern static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 6227d069b7dSAlan Stern { 6230458d5b4SAlan Stern dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 6240458d5b4SAlan Stern hub_port_disable(hub, port1, 1); 6250458d5b4SAlan Stern 6260458d5b4SAlan Stern /* FIXME let caller ask to power down the port: 6270458d5b4SAlan Stern * - some devices won't enumerate without a VBUS power cycle 6280458d5b4SAlan Stern * - SRP saves power that way 6290458d5b4SAlan Stern * - ... new call, TBD ... 6300458d5b4SAlan Stern * That's easy if this hub can switch power per-port, and 6310458d5b4SAlan Stern * khubd reactivates the port later (timer, SRP, etc). 6320458d5b4SAlan Stern * Powerdown must be optional, because of reset/DFU. 6330458d5b4SAlan Stern */ 6340458d5b4SAlan Stern 6350458d5b4SAlan Stern set_bit(port1, hub->change_bits); 6360458d5b4SAlan Stern kick_khubd(hub); 6370458d5b4SAlan Stern } 6380458d5b4SAlan Stern 6396ee0b270SAlan Stern enum hub_activation_type { 6408520f380SAlan Stern HUB_INIT, HUB_INIT2, HUB_INIT3, 6418520f380SAlan Stern HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, 6426ee0b270SAlan Stern }; 6435e6effaeSAlan Stern 6448520f380SAlan Stern static void hub_init_func2(struct work_struct *ws); 6458520f380SAlan Stern static void hub_init_func3(struct work_struct *ws); 6468520f380SAlan Stern 647f2835219SAlan Stern static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) 6485e6effaeSAlan Stern { 6495e6effaeSAlan Stern struct usb_device *hdev = hub->hdev; 6505e6effaeSAlan Stern int port1; 651f2835219SAlan Stern int status; 652948fea37SAlan Stern bool need_debounce_delay = false; 6538520f380SAlan Stern unsigned delay; 6548520f380SAlan Stern 6558520f380SAlan Stern /* Continue a partial initialization */ 6568520f380SAlan Stern if (type == HUB_INIT2) 6578520f380SAlan Stern goto init2; 6588520f380SAlan Stern if (type == HUB_INIT3) 6598520f380SAlan Stern goto init3; 6605e6effaeSAlan Stern 661f2835219SAlan Stern /* After a resume, port power should still be on. 662f2835219SAlan Stern * For any other type of activation, turn it on. 663f2835219SAlan Stern */ 6648520f380SAlan Stern if (type != HUB_RESUME) { 6658520f380SAlan Stern 6668520f380SAlan Stern /* Speed up system boot by using a delayed_work for the 6678520f380SAlan Stern * hub's initial power-up delays. This is pretty awkward 6688520f380SAlan Stern * and the implementation looks like a home-brewed sort of 6698520f380SAlan Stern * setjmp/longjmp, but it saves at least 100 ms for each 6708520f380SAlan Stern * root hub (assuming usbcore is compiled into the kernel 6718520f380SAlan Stern * rather than as a module). It adds up. 6728520f380SAlan Stern * 6738520f380SAlan Stern * This can't be done for HUB_RESUME or HUB_RESET_RESUME 6748520f380SAlan Stern * because for those activation types the ports have to be 6758520f380SAlan Stern * operational when we return. In theory this could be done 6768520f380SAlan Stern * for HUB_POST_RESET, but it's easier not to. 6778520f380SAlan Stern */ 6788520f380SAlan Stern if (type == HUB_INIT) { 6798520f380SAlan Stern delay = hub_power_on(hub, false); 6808520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); 6818520f380SAlan Stern schedule_delayed_work(&hub->init_work, 6828520f380SAlan Stern msecs_to_jiffies(delay)); 68361fbeba1SAlan Stern 68461fbeba1SAlan Stern /* Suppress autosuspend until init is done */ 685ccf5b801SAlan Stern atomic_set(&to_usb_interface(hub->intfdev)-> 686ccf5b801SAlan Stern pm_usage_cnt, 1); 6878520f380SAlan Stern return; /* Continues at init2: below */ 6888520f380SAlan Stern } else { 6898520f380SAlan Stern hub_power_on(hub, true); 6908520f380SAlan Stern } 6918520f380SAlan Stern } 6928520f380SAlan Stern init2: 693f2835219SAlan Stern 6946ee0b270SAlan Stern /* Check each port and set hub->change_bits to let khubd know 6956ee0b270SAlan Stern * which ports need attention. 6965e6effaeSAlan Stern */ 6975e6effaeSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 6985e6effaeSAlan Stern struct usb_device *udev = hdev->children[port1-1]; 6995e6effaeSAlan Stern u16 portstatus, portchange; 7005e6effaeSAlan Stern 7016ee0b270SAlan Stern portstatus = portchange = 0; 7026ee0b270SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 7036ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 7046ee0b270SAlan Stern dev_dbg(hub->intfdev, 7056ee0b270SAlan Stern "port %d: status %04x change %04x\n", 7066ee0b270SAlan Stern port1, portstatus, portchange); 7075e6effaeSAlan Stern 7086ee0b270SAlan Stern /* After anything other than HUB_RESUME (i.e., initialization 7096ee0b270SAlan Stern * or any sort of reset), every port should be disabled. 7106ee0b270SAlan Stern * Unconnected ports should likewise be disabled (paranoia), 7116ee0b270SAlan Stern * and so should ports for which we have no usb_device. 7125e6effaeSAlan Stern */ 7136ee0b270SAlan Stern if ((portstatus & USB_PORT_STAT_ENABLE) && ( 7146ee0b270SAlan Stern type != HUB_RESUME || 7156ee0b270SAlan Stern !(portstatus & USB_PORT_STAT_CONNECTION) || 7166ee0b270SAlan Stern !udev || 7176ee0b270SAlan Stern udev->state == USB_STATE_NOTATTACHED)) { 7186ee0b270SAlan Stern clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); 7196ee0b270SAlan Stern portstatus &= ~USB_PORT_STAT_ENABLE; 7206ee0b270SAlan Stern } 7216ee0b270SAlan Stern 722948fea37SAlan Stern /* Clear status-change flags; we'll debounce later */ 723948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) { 724948fea37SAlan Stern need_debounce_delay = true; 725948fea37SAlan Stern clear_port_feature(hub->hdev, port1, 726948fea37SAlan Stern USB_PORT_FEAT_C_CONNECTION); 727948fea37SAlan Stern } 728948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) { 729948fea37SAlan Stern need_debounce_delay = true; 730948fea37SAlan Stern clear_port_feature(hub->hdev, port1, 731948fea37SAlan Stern USB_PORT_FEAT_C_ENABLE); 732948fea37SAlan Stern } 733948fea37SAlan Stern 7346ee0b270SAlan Stern if (!udev || udev->state == USB_STATE_NOTATTACHED) { 7356ee0b270SAlan Stern /* Tell khubd to disconnect the device or 7366ee0b270SAlan Stern * check for a new connection 7376ee0b270SAlan Stern */ 7386ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 7396ee0b270SAlan Stern set_bit(port1, hub->change_bits); 7406ee0b270SAlan Stern 7416ee0b270SAlan Stern } else if (portstatus & USB_PORT_STAT_ENABLE) { 7426ee0b270SAlan Stern /* The power session apparently survived the resume. 7436ee0b270SAlan Stern * If there was an overcurrent or suspend change 7446ee0b270SAlan Stern * (i.e., remote wakeup request), have khubd 7456ee0b270SAlan Stern * take care of it. 7466ee0b270SAlan Stern */ 7476ee0b270SAlan Stern if (portchange) 7486ee0b270SAlan Stern set_bit(port1, hub->change_bits); 7496ee0b270SAlan Stern 7506ee0b270SAlan Stern } else if (udev->persist_enabled) { 7516ee0b270SAlan Stern #ifdef CONFIG_PM 7525e6effaeSAlan Stern udev->reset_resume = 1; 7536ee0b270SAlan Stern #endif 7548808f00cSAlan Stern set_bit(port1, hub->change_bits); 7558808f00cSAlan Stern 7566ee0b270SAlan Stern } else { 7576ee0b270SAlan Stern /* The power session is gone; tell khubd */ 7586ee0b270SAlan Stern usb_set_device_state(udev, USB_STATE_NOTATTACHED); 7596ee0b270SAlan Stern set_bit(port1, hub->change_bits); 7605e6effaeSAlan Stern } 7615e6effaeSAlan Stern } 7625e6effaeSAlan Stern 763948fea37SAlan Stern /* If no port-status-change flags were set, we don't need any 764948fea37SAlan Stern * debouncing. If flags were set we can try to debounce the 765948fea37SAlan Stern * ports all at once right now, instead of letting khubd do them 766948fea37SAlan Stern * one at a time later on. 767948fea37SAlan Stern * 768948fea37SAlan Stern * If any port-status changes do occur during this delay, khubd 769948fea37SAlan Stern * will see them later and handle them normally. 770948fea37SAlan Stern */ 7718520f380SAlan Stern if (need_debounce_delay) { 7728520f380SAlan Stern delay = HUB_DEBOUNCE_STABLE; 773f2835219SAlan Stern 7748520f380SAlan Stern /* Don't do a long sleep inside a workqueue routine */ 7758520f380SAlan Stern if (type == HUB_INIT2) { 7768520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); 7778520f380SAlan Stern schedule_delayed_work(&hub->init_work, 7788520f380SAlan Stern msecs_to_jiffies(delay)); 7798520f380SAlan Stern return; /* Continues at init3: below */ 7808520f380SAlan Stern } else { 7818520f380SAlan Stern msleep(delay); 7828520f380SAlan Stern } 7838520f380SAlan Stern } 7848520f380SAlan Stern init3: 785f2835219SAlan Stern hub->quiescing = 0; 786f2835219SAlan Stern 787f2835219SAlan Stern status = usb_submit_urb(hub->urb, GFP_NOIO); 788f2835219SAlan Stern if (status < 0) 789f2835219SAlan Stern dev_err(hub->intfdev, "activate --> %d\n", status); 790f2835219SAlan Stern if (hub->has_indicators && blinkenlights) 791f2835219SAlan Stern schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 792f2835219SAlan Stern 793f2835219SAlan Stern /* Scan all ports that need attention */ 794f2835219SAlan Stern kick_khubd(hub); 7955e6effaeSAlan Stern } 7965e6effaeSAlan Stern 7978520f380SAlan Stern /* Implement the continuations for the delays above */ 7988520f380SAlan Stern static void hub_init_func2(struct work_struct *ws) 7998520f380SAlan Stern { 8008520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 8018520f380SAlan Stern 8028520f380SAlan Stern hub_activate(hub, HUB_INIT2); 8038520f380SAlan Stern } 8048520f380SAlan Stern 8058520f380SAlan Stern static void hub_init_func3(struct work_struct *ws) 8068520f380SAlan Stern { 8078520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 8088520f380SAlan Stern 8098520f380SAlan Stern hub_activate(hub, HUB_INIT3); 8108520f380SAlan Stern } 8118520f380SAlan Stern 8124330354fSAlan Stern enum hub_quiescing_type { 8134330354fSAlan Stern HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND 8144330354fSAlan Stern }; 8154330354fSAlan Stern 8164330354fSAlan Stern static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) 8174330354fSAlan Stern { 8184330354fSAlan Stern struct usb_device *hdev = hub->hdev; 8194330354fSAlan Stern int i; 8204330354fSAlan Stern 8218520f380SAlan Stern cancel_delayed_work_sync(&hub->init_work); 8228520f380SAlan Stern 8234330354fSAlan Stern /* khubd and related activity won't re-trigger */ 8244330354fSAlan Stern hub->quiescing = 1; 8254330354fSAlan Stern 8264330354fSAlan Stern if (type != HUB_SUSPEND) { 8274330354fSAlan Stern /* Disconnect all the children */ 8284330354fSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 8294330354fSAlan Stern if (hdev->children[i]) 8304330354fSAlan Stern usb_disconnect(&hdev->children[i]); 8314330354fSAlan Stern } 8324330354fSAlan Stern } 8334330354fSAlan Stern 8344330354fSAlan Stern /* Stop khubd and related activity */ 8354330354fSAlan Stern usb_kill_urb(hub->urb); 8364330354fSAlan Stern if (hub->has_indicators) 8374330354fSAlan Stern cancel_delayed_work_sync(&hub->leds); 8384330354fSAlan Stern if (hub->tt.hub) 839cb88a1b8SAlan Stern cancel_work_sync(&hub->tt.clear_work); 8404330354fSAlan Stern } 8414330354fSAlan Stern 8423eb14915SAlan Stern /* caller has locked the hub device */ 8433eb14915SAlan Stern static int hub_pre_reset(struct usb_interface *intf) 8443eb14915SAlan Stern { 8453eb14915SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 8463eb14915SAlan Stern 8474330354fSAlan Stern hub_quiesce(hub, HUB_PRE_RESET); 848f07600cfSAlan Stern return 0; 8497d069b7dSAlan Stern } 8507d069b7dSAlan Stern 8517d069b7dSAlan Stern /* caller has locked the hub device */ 852f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 8537d069b7dSAlan Stern { 8547de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 8557de18d8bSAlan Stern 856f2835219SAlan Stern hub_activate(hub, HUB_POST_RESET); 857f07600cfSAlan Stern return 0; 8587d069b7dSAlan Stern } 8597d069b7dSAlan Stern 8601da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 8611da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 8621da177e4SLinus Torvalds { 863b356b7c7SSarah Sharp struct usb_hcd *hcd; 8641da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 8651da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 8661da177e4SLinus Torvalds u16 hubstatus, hubchange; 86774ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 8681da177e4SLinus Torvalds unsigned int pipe; 8691da177e4SLinus Torvalds int maxp, ret; 8707cbe5dcaSAlan Stern char *message = "out of memory"; 8711da177e4SLinus Torvalds 8721da177e4SLinus Torvalds hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL, 8731da177e4SLinus Torvalds &hub->buffer_dma); 8741da177e4SLinus Torvalds if (!hub->buffer) { 8751da177e4SLinus Torvalds ret = -ENOMEM; 8761da177e4SLinus Torvalds goto fail; 8771da177e4SLinus Torvalds } 8781da177e4SLinus Torvalds 8791da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 8801da177e4SLinus Torvalds if (!hub->status) { 8811da177e4SLinus Torvalds ret = -ENOMEM; 8821da177e4SLinus Torvalds goto fail; 8831da177e4SLinus Torvalds } 884db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 8851da177e4SLinus Torvalds 8861da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 8871da177e4SLinus Torvalds if (!hub->descriptor) { 8881da177e4SLinus Torvalds ret = -ENOMEM; 8891da177e4SLinus Torvalds goto fail; 8901da177e4SLinus Torvalds } 8911da177e4SLinus Torvalds 8921da177e4SLinus Torvalds /* Request the entire hub descriptor. 8931da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 8941da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 8951da177e4SLinus Torvalds */ 8961da177e4SLinus Torvalds ret = get_hub_descriptor(hdev, hub->descriptor, 8971da177e4SLinus Torvalds sizeof(*hub->descriptor)); 8981da177e4SLinus Torvalds if (ret < 0) { 8991da177e4SLinus Torvalds message = "can't read hub descriptor"; 9001da177e4SLinus Torvalds goto fail; 9011da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 9021da177e4SLinus Torvalds message = "hub has too many ports!"; 9031da177e4SLinus Torvalds ret = -ENODEV; 9041da177e4SLinus Torvalds goto fail; 9051da177e4SLinus Torvalds } 9061da177e4SLinus Torvalds 9071da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 9081da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 9091da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 9101da177e4SLinus Torvalds 9117cbe5dcaSAlan Stern hub->port_owners = kzalloc(hdev->maxchild * sizeof(void *), GFP_KERNEL); 9127cbe5dcaSAlan Stern if (!hub->port_owners) { 9137cbe5dcaSAlan Stern ret = -ENOMEM; 9147cbe5dcaSAlan Stern goto fail; 9157cbe5dcaSAlan Stern } 9167cbe5dcaSAlan Stern 91774ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 9181da177e4SLinus Torvalds 91974ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_COMPOUND) { 9201da177e4SLinus Torvalds int i; 9211da177e4SLinus Torvalds char portstr [USB_MAXCHILDREN + 1]; 9221da177e4SLinus Torvalds 9231da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 9241da177e4SLinus Torvalds portstr[i] = hub->descriptor->DeviceRemovable 9251da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 9261da177e4SLinus Torvalds ? 'F' : 'R'; 9271da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 9281da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 9291da177e4SLinus Torvalds } else 9301da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 9311da177e4SLinus Torvalds 93274ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 9331da177e4SLinus Torvalds case 0x00: 9341da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 9351da177e4SLinus Torvalds break; 9361da177e4SLinus Torvalds case 0x01: 9371da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 9381da177e4SLinus Torvalds break; 9391da177e4SLinus Torvalds case 0x02: 9401da177e4SLinus Torvalds case 0x03: 9411da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 9421da177e4SLinus Torvalds break; 9431da177e4SLinus Torvalds } 9441da177e4SLinus Torvalds 94574ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 9461da177e4SLinus Torvalds case 0x00: 9471da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 9481da177e4SLinus Torvalds break; 9491da177e4SLinus Torvalds case 0x08: 9501da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 9511da177e4SLinus Torvalds break; 9521da177e4SLinus Torvalds case 0x10: 9531da177e4SLinus Torvalds case 0x18: 9541da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 9551da177e4SLinus Torvalds break; 9561da177e4SLinus Torvalds } 9571da177e4SLinus Torvalds 9581da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 9591da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 960cb88a1b8SAlan Stern INIT_WORK(&hub->tt.clear_work, hub_tt_work); 9611da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 9621da177e4SLinus Torvalds case 0: 9631da177e4SLinus Torvalds break; 9641da177e4SLinus Torvalds case 1: 9651da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 9661da177e4SLinus Torvalds hub->tt.hub = hdev; 9671da177e4SLinus Torvalds break; 9681da177e4SLinus Torvalds case 2: 9691da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 9701da177e4SLinus Torvalds if (ret == 0) { 9711da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 9721da177e4SLinus Torvalds hub->tt.multi = 1; 9731da177e4SLinus Torvalds } else 9741da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 9751da177e4SLinus Torvalds ret); 9761da177e4SLinus Torvalds hub->tt.hub = hdev; 9771da177e4SLinus Torvalds break; 978d2e9b4d6SSarah Sharp case 3: 979d2e9b4d6SSarah Sharp /* USB 3.0 hubs don't have a TT */ 980d2e9b4d6SSarah Sharp break; 9811da177e4SLinus Torvalds default: 9821da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 9831da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 9841da177e4SLinus Torvalds break; 9851da177e4SLinus Torvalds } 9861da177e4SLinus Torvalds 987e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 98874ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 989e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 990e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 991e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 992e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 993e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 994e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 995e09711aeSdavid-b@pacbell.net } 9961da177e4SLinus Torvalds break; 997e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 998e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 999e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1000e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1001e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 10021da177e4SLinus Torvalds break; 1003e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 1004e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 1005e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1006e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1007e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 10081da177e4SLinus Torvalds break; 1009e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 1010e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 1011e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1012e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1013e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 10141da177e4SLinus Torvalds break; 10151da177e4SLinus Torvalds } 10161da177e4SLinus Torvalds 10171da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 101874ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 10191da177e4SLinus Torvalds hub->has_indicators = 1; 10201da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 10211da177e4SLinus Torvalds } 10221da177e4SLinus Torvalds 10231da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 10241da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 10251da177e4SLinus Torvalds 10261da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 10271da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 10281da177e4SLinus Torvalds */ 10291da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 103055c52718SAlan Stern if (ret < 2) { 10311da177e4SLinus Torvalds message = "can't get hub status"; 10321da177e4SLinus Torvalds goto fail; 10331da177e4SLinus Torvalds } 10347d35b929SAlan Stern le16_to_cpus(&hubstatus); 10357d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 103655c52718SAlan Stern if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) 103755c52718SAlan Stern hub->mA_per_port = 500; 103855c52718SAlan Stern else { 103955c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 104055c52718SAlan Stern hub->limited_power = 1; 104155c52718SAlan Stern } 10427d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 10431da177e4SLinus Torvalds dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 10441da177e4SLinus Torvalds hub->descriptor->bHubContrCurrent); 104555c52718SAlan Stern hub->limited_power = 1; 104655c52718SAlan Stern if (hdev->maxchild > 0) { 104755c52718SAlan Stern int remaining = hdev->bus_mA - 104855c52718SAlan Stern hub->descriptor->bHubContrCurrent; 10491da177e4SLinus Torvalds 105055c52718SAlan Stern if (remaining < hdev->maxchild * 100) 105155c52718SAlan Stern dev_warn(hub_dev, 105255c52718SAlan Stern "insufficient power available " 105355c52718SAlan Stern "to use all downstream ports\n"); 105455c52718SAlan Stern hub->mA_per_port = 100; /* 7.2.1.1 */ 105555c52718SAlan Stern } 105655c52718SAlan Stern } else { /* Self-powered external hub */ 105755c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 105855c52718SAlan Stern * provide less current per port? */ 105955c52718SAlan Stern hub->mA_per_port = 500; 106055c52718SAlan Stern } 106155c52718SAlan Stern if (hub->mA_per_port < 500) 106255c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 106355c52718SAlan Stern hub->mA_per_port); 10641da177e4SLinus Torvalds 1065b356b7c7SSarah Sharp /* Update the HCD's internal representation of this hub before khubd 1066b356b7c7SSarah Sharp * starts getting port status changes for devices under the hub. 1067b356b7c7SSarah Sharp */ 1068b356b7c7SSarah Sharp hcd = bus_to_hcd(hdev->bus); 1069b356b7c7SSarah Sharp if (hcd->driver->update_hub_device) { 1070b356b7c7SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1071b356b7c7SSarah Sharp &hub->tt, GFP_KERNEL); 1072b356b7c7SSarah Sharp if (ret < 0) { 1073b356b7c7SSarah Sharp message = "can't update HCD hub info"; 1074b356b7c7SSarah Sharp goto fail; 1075b356b7c7SSarah Sharp } 1076b356b7c7SSarah Sharp } 1077b356b7c7SSarah Sharp 10781da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 10791da177e4SLinus Torvalds if (ret < 0) { 10801da177e4SLinus Torvalds message = "can't get hub status"; 10811da177e4SLinus Torvalds goto fail; 10821da177e4SLinus Torvalds } 10831da177e4SLinus Torvalds 10841da177e4SLinus Torvalds /* local power status reports aren't always correct */ 10851da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 10861da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 10871da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 10881da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 10891da177e4SLinus Torvalds 109074ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 10911da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 10921da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 10931da177e4SLinus Torvalds 109488fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 109588fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 109688fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 109788fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 109888fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 109988fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 11001da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 11011da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 11021da177e4SLinus Torvalds 11031da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 11041da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 11051da177e4SLinus Torvalds 11061da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 11071da177e4SLinus Torvalds if (!hub->urb) { 11081da177e4SLinus Torvalds ret = -ENOMEM; 11091da177e4SLinus Torvalds goto fail; 11101da177e4SLinus Torvalds } 11111da177e4SLinus Torvalds 11121da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 11131da177e4SLinus Torvalds hub, endpoint->bInterval); 11141da177e4SLinus Torvalds hub->urb->transfer_dma = hub->buffer_dma; 11151da177e4SLinus Torvalds hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 11161da177e4SLinus Torvalds 11171da177e4SLinus Torvalds /* maybe cycle the hub leds */ 11181da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 11191da177e4SLinus Torvalds hub->indicator [0] = INDICATOR_CYCLE; 11201da177e4SLinus Torvalds 1121f2835219SAlan Stern hub_activate(hub, HUB_INIT); 11221da177e4SLinus Torvalds return 0; 11231da177e4SLinus Torvalds 11241da177e4SLinus Torvalds fail: 11251da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 11261da177e4SLinus Torvalds message, ret); 11271da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 11281da177e4SLinus Torvalds return ret; 11291da177e4SLinus Torvalds } 11301da177e4SLinus Torvalds 1131e8054854SAlan Stern static void hub_release(struct kref *kref) 1132e8054854SAlan Stern { 1133e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 1134e8054854SAlan Stern 1135e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 1136e8054854SAlan Stern kfree(hub); 1137e8054854SAlan Stern } 1138e8054854SAlan Stern 11391da177e4SLinus Torvalds static unsigned highspeed_hubs; 11401da177e4SLinus Torvalds 11411da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 11421da177e4SLinus Torvalds { 11431da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 1144e8054854SAlan Stern 1145e8054854SAlan Stern /* Take the hub off the event list and don't let it be added again */ 1146e8054854SAlan Stern spin_lock_irq(&hub_event_lock); 1147e8054854SAlan Stern list_del_init(&hub->event_list); 1148e8054854SAlan Stern hub->disconnected = 1; 1149e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 11501da177e4SLinus Torvalds 11517de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 11527de18d8bSAlan Stern hub->error = 0; 11534330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 11547de18d8bSAlan Stern 11558b28c752SAlan Stern usb_set_intfdata (intf, NULL); 11567cbe5dcaSAlan Stern hub->hdev->maxchild = 0; 11571da177e4SLinus Torvalds 1158e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 11591da177e4SLinus Torvalds highspeed_hubs--; 11601da177e4SLinus Torvalds 11611da177e4SLinus Torvalds usb_free_urb(hub->urb); 11627cbe5dcaSAlan Stern kfree(hub->port_owners); 11631da177e4SLinus Torvalds kfree(hub->descriptor); 11641da177e4SLinus Torvalds kfree(hub->status); 1165e8054854SAlan Stern usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer, 11661da177e4SLinus Torvalds hub->buffer_dma); 11671da177e4SLinus Torvalds 1168e8054854SAlan Stern kref_put(&hub->kref, hub_release); 11691da177e4SLinus Torvalds } 11701da177e4SLinus Torvalds 11711da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 11721da177e4SLinus Torvalds { 11731da177e4SLinus Torvalds struct usb_host_interface *desc; 11741da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 11751da177e4SLinus Torvalds struct usb_device *hdev; 11761da177e4SLinus Torvalds struct usb_hub *hub; 11771da177e4SLinus Torvalds 11781da177e4SLinus Torvalds desc = intf->cur_altsetting; 11791da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 11801da177e4SLinus Torvalds 118138f3ad5eSFelipe Balbi if (hdev->level == MAX_TOPO_LEVEL) { 1182b9cef6c3SWu Fengguang dev_err(&intf->dev, 1183b9cef6c3SWu Fengguang "Unsupported bus topology: hub nested too deep\n"); 118438f3ad5eSFelipe Balbi return -E2BIG; 118538f3ad5eSFelipe Balbi } 118638f3ad5eSFelipe Balbi 118789ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 118889ccbdc9SDavid Brownell if (hdev->parent) { 118989ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 119089ccbdc9SDavid Brownell return -ENODEV; 119189ccbdc9SDavid Brownell } 119289ccbdc9SDavid Brownell #endif 119389ccbdc9SDavid Brownell 11941da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 11951da177e4SLinus Torvalds /* specs is not defined, but it works */ 11961da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 11971da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 11981da177e4SLinus Torvalds descriptor_error: 11991da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 12001da177e4SLinus Torvalds return -EIO; 12011da177e4SLinus Torvalds } 12021da177e4SLinus Torvalds 12031da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 12041da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 12051da177e4SLinus Torvalds goto descriptor_error; 12061da177e4SLinus Torvalds 12071da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 12081da177e4SLinus Torvalds 1209fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 1210fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 12111da177e4SLinus Torvalds goto descriptor_error; 12121da177e4SLinus Torvalds 12131da177e4SLinus Torvalds /* We found a hub */ 12141da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 12151da177e4SLinus Torvalds 12160a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 12171da177e4SLinus Torvalds if (!hub) { 12181da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 12191da177e4SLinus Torvalds return -ENOMEM; 12201da177e4SLinus Torvalds } 12211da177e4SLinus Torvalds 1222e8054854SAlan Stern kref_init(&hub->kref); 12231da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 12241da177e4SLinus Torvalds hub->intfdev = &intf->dev; 12251da177e4SLinus Torvalds hub->hdev = hdev; 1226c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 12278520f380SAlan Stern INIT_DELAYED_WORK(&hub->init_work, NULL); 1228e8054854SAlan Stern usb_get_intf(intf); 12291da177e4SLinus Torvalds 12301da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 123140f122f3SAlan Stern intf->needs_remote_wakeup = 1; 12321da177e4SLinus Torvalds 12331da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 12341da177e4SLinus Torvalds highspeed_hubs++; 12351da177e4SLinus Torvalds 12361da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 12371da177e4SLinus Torvalds return 0; 12381da177e4SLinus Torvalds 12391da177e4SLinus Torvalds hub_disconnect (intf); 12401da177e4SLinus Torvalds return -ENODEV; 12411da177e4SLinus Torvalds } 12421da177e4SLinus Torvalds 12431da177e4SLinus Torvalds static int 12441da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 12451da177e4SLinus Torvalds { 12461da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 12471da177e4SLinus Torvalds 12481da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 12491da177e4SLinus Torvalds switch (code) { 12501da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 12511da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 12521da177e4SLinus Torvalds int i; 12531da177e4SLinus Torvalds 12541da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 12551da177e4SLinus Torvalds if (hdev->devnum <= 0) 12561da177e4SLinus Torvalds info->nports = 0; 12571da177e4SLinus Torvalds else { 12581da177e4SLinus Torvalds info->nports = hdev->maxchild; 12591da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 12601da177e4SLinus Torvalds if (hdev->children[i] == NULL) 12611da177e4SLinus Torvalds info->port[i] = 0; 12621da177e4SLinus Torvalds else 12631da177e4SLinus Torvalds info->port[i] = 12641da177e4SLinus Torvalds hdev->children[i]->devnum; 12651da177e4SLinus Torvalds } 12661da177e4SLinus Torvalds } 12671da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 12681da177e4SLinus Torvalds 12691da177e4SLinus Torvalds return info->nports + 1; 12701da177e4SLinus Torvalds } 12711da177e4SLinus Torvalds 12721da177e4SLinus Torvalds default: 12731da177e4SLinus Torvalds return -ENOSYS; 12741da177e4SLinus Torvalds } 12751da177e4SLinus Torvalds } 12761da177e4SLinus Torvalds 12777cbe5dcaSAlan Stern /* 12787cbe5dcaSAlan Stern * Allow user programs to claim ports on a hub. When a device is attached 12797cbe5dcaSAlan Stern * to one of these "claimed" ports, the program will "own" the device. 12807cbe5dcaSAlan Stern */ 12817cbe5dcaSAlan Stern static int find_port_owner(struct usb_device *hdev, unsigned port1, 12827cbe5dcaSAlan Stern void ***ppowner) 12837cbe5dcaSAlan Stern { 12847cbe5dcaSAlan Stern if (hdev->state == USB_STATE_NOTATTACHED) 12857cbe5dcaSAlan Stern return -ENODEV; 12867cbe5dcaSAlan Stern if (port1 == 0 || port1 > hdev->maxchild) 12877cbe5dcaSAlan Stern return -EINVAL; 12887cbe5dcaSAlan Stern 12897cbe5dcaSAlan Stern /* This assumes that devices not managed by the hub driver 12907cbe5dcaSAlan Stern * will always have maxchild equal to 0. 12917cbe5dcaSAlan Stern */ 12927cbe5dcaSAlan Stern *ppowner = &(hdev_to_hub(hdev)->port_owners[port1 - 1]); 12937cbe5dcaSAlan Stern return 0; 12947cbe5dcaSAlan Stern } 12957cbe5dcaSAlan Stern 12967cbe5dcaSAlan Stern /* In the following three functions, the caller must hold hdev's lock */ 12977cbe5dcaSAlan Stern int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, void *owner) 12987cbe5dcaSAlan Stern { 12997cbe5dcaSAlan Stern int rc; 13007cbe5dcaSAlan Stern void **powner; 13017cbe5dcaSAlan Stern 13027cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 13037cbe5dcaSAlan Stern if (rc) 13047cbe5dcaSAlan Stern return rc; 13057cbe5dcaSAlan Stern if (*powner) 13067cbe5dcaSAlan Stern return -EBUSY; 13077cbe5dcaSAlan Stern *powner = owner; 13087cbe5dcaSAlan Stern return rc; 13097cbe5dcaSAlan Stern } 13107cbe5dcaSAlan Stern 13117cbe5dcaSAlan Stern int usb_hub_release_port(struct usb_device *hdev, unsigned port1, void *owner) 13127cbe5dcaSAlan Stern { 13137cbe5dcaSAlan Stern int rc; 13147cbe5dcaSAlan Stern void **powner; 13157cbe5dcaSAlan Stern 13167cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 13177cbe5dcaSAlan Stern if (rc) 13187cbe5dcaSAlan Stern return rc; 13197cbe5dcaSAlan Stern if (*powner != owner) 13207cbe5dcaSAlan Stern return -ENOENT; 13217cbe5dcaSAlan Stern *powner = NULL; 13227cbe5dcaSAlan Stern return rc; 13237cbe5dcaSAlan Stern } 13247cbe5dcaSAlan Stern 13257cbe5dcaSAlan Stern void usb_hub_release_all_ports(struct usb_device *hdev, void *owner) 13267cbe5dcaSAlan Stern { 13277cbe5dcaSAlan Stern int n; 13287cbe5dcaSAlan Stern void **powner; 13297cbe5dcaSAlan Stern 13307cbe5dcaSAlan Stern n = find_port_owner(hdev, 1, &powner); 13317cbe5dcaSAlan Stern if (n == 0) { 13327cbe5dcaSAlan Stern for (; n < hdev->maxchild; (++n, ++powner)) { 13337cbe5dcaSAlan Stern if (*powner == owner) 13347cbe5dcaSAlan Stern *powner = NULL; 13357cbe5dcaSAlan Stern } 13367cbe5dcaSAlan Stern } 13377cbe5dcaSAlan Stern } 13387cbe5dcaSAlan Stern 13397cbe5dcaSAlan Stern /* The caller must hold udev's lock */ 13407cbe5dcaSAlan Stern bool usb_device_is_owned(struct usb_device *udev) 13417cbe5dcaSAlan Stern { 13427cbe5dcaSAlan Stern struct usb_hub *hub; 13437cbe5dcaSAlan Stern 13447cbe5dcaSAlan Stern if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) 13457cbe5dcaSAlan Stern return false; 13467cbe5dcaSAlan Stern hub = hdev_to_hub(udev->parent); 13477cbe5dcaSAlan Stern return !!hub->port_owners[udev->portnum - 1]; 13487cbe5dcaSAlan Stern } 13497cbe5dcaSAlan Stern 13501da177e4SLinus Torvalds 13511da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 13521da177e4SLinus Torvalds { 13531da177e4SLinus Torvalds int i; 13541da177e4SLinus Torvalds 13551da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 13561da177e4SLinus Torvalds if (udev->children[i]) 13571da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev->children[i]); 13581da177e4SLinus Torvalds } 135915123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED) { 1360ee49fb5dSAlan Stern udev->discon_suspended = 1; 136115123006SSarah Sharp udev->active_duration -= jiffies; 136215123006SSarah Sharp } 13631da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 13641da177e4SLinus Torvalds } 13651da177e4SLinus Torvalds 13661da177e4SLinus Torvalds /** 13671da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 13681da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 13691da177e4SLinus Torvalds * @new_state: new state value to be stored 13701da177e4SLinus Torvalds * 13711da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 13721da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 13731da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 13741da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 13751da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 13761da177e4SLinus Torvalds * all changes to any device's state must be protected by the 13771da177e4SLinus Torvalds * device_state_lock spinlock. 13781da177e4SLinus Torvalds * 13791da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 13801da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 13811da177e4SLinus Torvalds * 13821da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 13831da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 13841da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 13851da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 13861da177e4SLinus Torvalds */ 13871da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 13881da177e4SLinus Torvalds enum usb_device_state new_state) 13891da177e4SLinus Torvalds { 13901da177e4SLinus Torvalds unsigned long flags; 13911da177e4SLinus Torvalds 13921da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 13931da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 13941da177e4SLinus Torvalds ; /* do nothing */ 1395b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1396fb669cc0SDavid Brownell 1397fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1398fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1399fb669cc0SDavid Brownell */ 1400fb669cc0SDavid Brownell if (udev->parent) { 1401645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1402645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1403645daaabSAlan Stern ; /* No change to wakeup settings */ 1404645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 1405b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 1406b94dc6b5SDavid Brownell (udev->actconfig->desc.bmAttributes 1407b94dc6b5SDavid Brownell & USB_CONFIG_ATT_WAKEUP)); 1408645daaabSAlan Stern else 1409b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 0); 1410fb669cc0SDavid Brownell } 141115123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED && 141215123006SSarah Sharp new_state != USB_STATE_SUSPENDED) 141315123006SSarah Sharp udev->active_duration -= jiffies; 141415123006SSarah Sharp else if (new_state == USB_STATE_SUSPENDED && 141515123006SSarah Sharp udev->state != USB_STATE_SUSPENDED) 141615123006SSarah Sharp udev->active_duration += jiffies; 1417645daaabSAlan Stern udev->state = new_state; 1418b94dc6b5SDavid Brownell } else 14191da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 14201da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 14211da177e4SLinus Torvalds } 14226da9c990SDavid Vrabel EXPORT_SYMBOL_GPL(usb_set_device_state); 14231da177e4SLinus Torvalds 14248af548dcSInaky Perez-Gonzalez /* 14258af548dcSInaky Perez-Gonzalez * WUSB devices are simple: they have no hubs behind, so the mapping 14268af548dcSInaky Perez-Gonzalez * device <-> virtual port number becomes 1:1. Why? to simplify the 14278af548dcSInaky Perez-Gonzalez * life of the device connection logic in 14288af548dcSInaky Perez-Gonzalez * drivers/usb/wusbcore/devconnect.c. When we do the initial secret 14298af548dcSInaky Perez-Gonzalez * handshake we need to assign a temporary address in the unauthorized 14308af548dcSInaky Perez-Gonzalez * space. For simplicity we use the first virtual port number found to 14318af548dcSInaky Perez-Gonzalez * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] 14328af548dcSInaky Perez-Gonzalez * and that becomes it's address [X < 128] or its unauthorized address 14338af548dcSInaky Perez-Gonzalez * [X | 0x80]. 14348af548dcSInaky Perez-Gonzalez * 14358af548dcSInaky Perez-Gonzalez * We add 1 as an offset to the one-based USB-stack port number 14368af548dcSInaky Perez-Gonzalez * (zero-based wusb virtual port index) for two reasons: (a) dev addr 14378af548dcSInaky Perez-Gonzalez * 0 is reserved by USB for default address; (b) Linux's USB stack 14388af548dcSInaky Perez-Gonzalez * uses always #1 for the root hub of the controller. So USB stack's 14398af548dcSInaky Perez-Gonzalez * port #1, which is wusb virtual-port #0 has address #2. 1440c6515272SSarah Sharp * 1441c6515272SSarah Sharp * Devices connected under xHCI are not as simple. The host controller 1442c6515272SSarah Sharp * supports virtualization, so the hardware assigns device addresses and 1443c6515272SSarah Sharp * the HCD must setup data structures before issuing a set address 1444c6515272SSarah Sharp * command to the hardware. 14458af548dcSInaky Perez-Gonzalez */ 14461da177e4SLinus Torvalds static void choose_address(struct usb_device *udev) 14471da177e4SLinus Torvalds { 14481da177e4SLinus Torvalds int devnum; 14491da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 14501da177e4SLinus Torvalds 14511da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 14528af548dcSInaky Perez-Gonzalez if (udev->wusb) { 14538af548dcSInaky Perez-Gonzalez devnum = udev->portnum + 1; 14548af548dcSInaky Perez-Gonzalez BUG_ON(test_bit(devnum, bus->devmap.devicemap)); 14558af548dcSInaky Perez-Gonzalez } else { 14568af548dcSInaky Perez-Gonzalez /* Try to allocate the next devnum beginning at 14578af548dcSInaky Perez-Gonzalez * bus->devnum_next. */ 14581da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 14591da177e4SLinus Torvalds bus->devnum_next); 14601da177e4SLinus Torvalds if (devnum >= 128) 14618af548dcSInaky Perez-Gonzalez devnum = find_next_zero_bit(bus->devmap.devicemap, 14628af548dcSInaky Perez-Gonzalez 128, 1); 14631da177e4SLinus Torvalds bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); 14648af548dcSInaky Perez-Gonzalez } 14651da177e4SLinus Torvalds if (devnum < 128) { 14661da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 14671da177e4SLinus Torvalds udev->devnum = devnum; 14681da177e4SLinus Torvalds } 14691da177e4SLinus Torvalds } 14701da177e4SLinus Torvalds 14711da177e4SLinus Torvalds static void release_address(struct usb_device *udev) 14721da177e4SLinus Torvalds { 14731da177e4SLinus Torvalds if (udev->devnum > 0) { 14741da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 14751da177e4SLinus Torvalds udev->devnum = -1; 14761da177e4SLinus Torvalds } 14771da177e4SLinus Torvalds } 14781da177e4SLinus Torvalds 14794953d141SDavid Vrabel static void update_address(struct usb_device *udev, int devnum) 14804953d141SDavid Vrabel { 14814953d141SDavid Vrabel /* The address for a WUSB device is managed by wusbcore. */ 14824953d141SDavid Vrabel if (!udev->wusb) 14834953d141SDavid Vrabel udev->devnum = devnum; 14844953d141SDavid Vrabel } 14854953d141SDavid Vrabel 1486d5d4db70SAlan Stern #ifdef CONFIG_USB_SUSPEND 1487d5d4db70SAlan Stern 1488d5d4db70SAlan Stern static void usb_stop_pm(struct usb_device *udev) 1489d5d4db70SAlan Stern { 1490d5d4db70SAlan Stern /* Synchronize with the ksuspend thread to prevent any more 1491d5d4db70SAlan Stern * autosuspend requests from being submitted, and decrement 1492d5d4db70SAlan Stern * the parent's count of unsuspended children. 1493d5d4db70SAlan Stern */ 1494d5d4db70SAlan Stern usb_pm_lock(udev); 1495d5d4db70SAlan Stern if (udev->parent && !udev->discon_suspended) 1496d5d4db70SAlan Stern usb_autosuspend_device(udev->parent); 1497d5d4db70SAlan Stern usb_pm_unlock(udev); 1498d5d4db70SAlan Stern 14999ac39f28SAlan Stern /* Stop any autosuspend or autoresume requests already submitted */ 15009ac39f28SAlan Stern cancel_delayed_work_sync(&udev->autosuspend); 15019ac39f28SAlan Stern cancel_work_sync(&udev->autoresume); 1502d5d4db70SAlan Stern } 1503d5d4db70SAlan Stern 1504d5d4db70SAlan Stern #else 1505d5d4db70SAlan Stern 1506d5d4db70SAlan Stern static inline void usb_stop_pm(struct usb_device *udev) 1507d5d4db70SAlan Stern { } 1508d5d4db70SAlan Stern 1509d5d4db70SAlan Stern #endif 1510d5d4db70SAlan Stern 15111da177e4SLinus Torvalds /** 15121da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 15131da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 15141da177e4SLinus Torvalds * Context: !in_interrupt () 15151da177e4SLinus Torvalds * 15161da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 15171da177e4SLinus Torvalds * 15181da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 15191da177e4SLinus Torvalds * If *pdev is a root hub then this routine will acquire the 15201da177e4SLinus Torvalds * usb_bus_list_lock on behalf of the caller. 15211da177e4SLinus Torvalds * 15221da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 15231da177e4SLinus Torvalds * controllers) should ever call this. 15241da177e4SLinus Torvalds * 15251da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 15261da177e4SLinus Torvalds */ 15271da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 15281da177e4SLinus Torvalds { 15291da177e4SLinus Torvalds struct usb_device *udev = *pdev; 15301da177e4SLinus Torvalds int i; 15311da177e4SLinus Torvalds 15321da177e4SLinus Torvalds if (!udev) { 1533441b62c1SHarvey Harrison pr_debug ("%s nodev\n", __func__); 15341da177e4SLinus Torvalds return; 15351da177e4SLinus Torvalds } 15361da177e4SLinus Torvalds 15371da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 15381da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 15391da177e4SLinus Torvalds * this quiesces everyting except pending urbs. 15401da177e4SLinus Torvalds */ 15411da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 15421da177e4SLinus Torvalds dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); 15431da177e4SLinus Torvalds 15449ad3d6ccSAlan Stern usb_lock_device(udev); 15459ad3d6ccSAlan Stern 15461da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 15471da177e4SLinus Torvalds for (i = 0; i < USB_MAXCHILDREN; i++) { 15481da177e4SLinus Torvalds if (udev->children[i]) 15491da177e4SLinus Torvalds usb_disconnect(&udev->children[i]); 15501da177e4SLinus Torvalds } 15511da177e4SLinus Torvalds 15521da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 15531da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 15541da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 15551da177e4SLinus Torvalds */ 1556782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 15571da177e4SLinus Torvalds usb_disable_device(udev, 0); 1558cde217a5SAlan Stern usb_hcd_synchronize_unlinks(udev); 15591da177e4SLinus Torvalds 15603b23dd6fSAlan Stern usb_remove_ep_devs(&udev->ep0); 1561782da727SAlan Stern usb_unlock_device(udev); 15623099e75aSGreg Kroah-Hartman 1563782da727SAlan Stern /* Unregister the device. The device driver is responsible 15643b23dd6fSAlan Stern * for de-configuring the device and invoking the remove-device 15653b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 1566782da727SAlan Stern */ 1567782da727SAlan Stern device_del(&udev->dev); 1568782da727SAlan Stern 1569782da727SAlan Stern /* Free the device number and delete the parent's children[] 15701da177e4SLinus Torvalds * (or root_hub) pointer. 15711da177e4SLinus Torvalds */ 15721da177e4SLinus Torvalds release_address(udev); 15731da177e4SLinus Torvalds 15741da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 15751da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 15761da177e4SLinus Torvalds *pdev = NULL; 15771da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 15781da177e4SLinus Torvalds 1579d5d4db70SAlan Stern usb_stop_pm(udev); 1580ee49fb5dSAlan Stern 1581782da727SAlan Stern put_device(&udev->dev); 15821da177e4SLinus Torvalds } 15831da177e4SLinus Torvalds 1584f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 15851da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 15861da177e4SLinus Torvalds { 15871da177e4SLinus Torvalds if (!string) 15881da177e4SLinus Torvalds return; 15891da177e4SLinus Torvalds dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); 15901da177e4SLinus Torvalds } 15911da177e4SLinus Torvalds 1592f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 1593f2a383e4SGreg Kroah-Hartman { 1594f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", 1595f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 1596f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idProduct)); 1597b9cef6c3SWu Fengguang dev_info(&udev->dev, 1598b9cef6c3SWu Fengguang "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", 1599f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 1600f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 1601f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 1602f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 1603f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 1604f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 1605f2a383e4SGreg Kroah-Hartman } 16061da177e4SLinus Torvalds #else 1607f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 16081da177e4SLinus Torvalds #endif 16091da177e4SLinus Torvalds 16101da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 16111da177e4SLinus Torvalds #include "otg_whitelist.h" 16121da177e4SLinus Torvalds #endif 16131da177e4SLinus Torvalds 16143ede760fSOliver Neukum /** 1615d9d16e8aSInaky Perez-Gonzalez * usb_configure_device_otg - FIXME (usbcore-internal) 16163ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 16173ede760fSOliver Neukum * 1618d9d16e8aSInaky Perez-Gonzalez * Do configuration for On-The-Go devices 16193ede760fSOliver Neukum */ 1620d9d16e8aSInaky Perez-Gonzalez static int usb_configure_device_otg(struct usb_device *udev) 16211da177e4SLinus Torvalds { 1622d9d16e8aSInaky Perez-Gonzalez int err = 0; 16231da177e4SLinus Torvalds 16241da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 16251da177e4SLinus Torvalds /* 16261da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 16271da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 16281da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 16291da177e4SLinus Torvalds */ 16301da177e4SLinus Torvalds if (!udev->bus->is_b_host 16311da177e4SLinus Torvalds && udev->config 16321da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 16331da177e4SLinus Torvalds struct usb_otg_descriptor *desc = 0; 16341da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 16351da177e4SLinus Torvalds 16361da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 16371da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 16381da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 16391da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 16401da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 164112c3da34SAlan Stern unsigned port1 = udev->portnum; 16421da177e4SLinus Torvalds 16431da177e4SLinus Torvalds dev_info(&udev->dev, 16441da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 16451da177e4SLinus Torvalds (port1 == bus->otg_port) 16461da177e4SLinus Torvalds ? "" : "non-"); 16471da177e4SLinus Torvalds 16481da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 16491da177e4SLinus Torvalds if (port1 == bus->otg_port) 16501da177e4SLinus Torvalds bus->b_hnp_enable = 1; 16511da177e4SLinus Torvalds err = usb_control_msg(udev, 16521da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 16531da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 16541da177e4SLinus Torvalds bus->b_hnp_enable 16551da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 16561da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 16571da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 16581da177e4SLinus Torvalds if (err < 0) { 16591da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 16601da177e4SLinus Torvalds * customize to match your product. 16611da177e4SLinus Torvalds */ 16621da177e4SLinus Torvalds dev_info(&udev->dev, 1663b9cef6c3SWu Fengguang "can't set HNP mode: %d\n", 16641da177e4SLinus Torvalds err); 16651da177e4SLinus Torvalds bus->b_hnp_enable = 0; 16661da177e4SLinus Torvalds } 16671da177e4SLinus Torvalds } 16681da177e4SLinus Torvalds } 16691da177e4SLinus Torvalds } 16701da177e4SLinus Torvalds 16711da177e4SLinus Torvalds if (!is_targeted(udev)) { 16721da177e4SLinus Torvalds 16731da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 16741da177e4SLinus Torvalds * (Includes HNP test device.) 16751da177e4SLinus Torvalds */ 16761da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 1677634a84f8SDavid Brownell err = usb_port_suspend(udev, PMSG_SUSPEND); 16781da177e4SLinus Torvalds if (err < 0) 16791da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 16801da177e4SLinus Torvalds } 1681ffcdc18dSVikram Pandita err = -ENOTSUPP; 16821da177e4SLinus Torvalds goto fail; 16831da177e4SLinus Torvalds } 1684d9d16e8aSInaky Perez-Gonzalez fail: 16851da177e4SLinus Torvalds #endif 1686d9d16e8aSInaky Perez-Gonzalez return err; 1687d9d16e8aSInaky Perez-Gonzalez } 16881da177e4SLinus Torvalds 1689d9d16e8aSInaky Perez-Gonzalez 1690d9d16e8aSInaky Perez-Gonzalez /** 1691d9d16e8aSInaky Perez-Gonzalez * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal) 1692d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 1693d9d16e8aSInaky Perez-Gonzalez * 1694d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 1695d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 1696d9d16e8aSInaky Perez-Gonzalez * environment. 1697d9d16e8aSInaky Perez-Gonzalez * 1698d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 1699d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 1700d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 1701d9d16e8aSInaky Perez-Gonzalez */ 1702d9d16e8aSInaky Perez-Gonzalez static int usb_configure_device(struct usb_device *udev) 1703d9d16e8aSInaky Perez-Gonzalez { 1704d9d16e8aSInaky Perez-Gonzalez int err; 1705d9d16e8aSInaky Perez-Gonzalez 1706d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 1707d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 1708d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 1709d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 1710d9d16e8aSInaky Perez-Gonzalez err); 1711d9d16e8aSInaky Perez-Gonzalez goto fail; 1712d9d16e8aSInaky Perez-Gonzalez } 1713d9d16e8aSInaky Perez-Gonzalez } 1714d9d16e8aSInaky Perez-Gonzalez if (udev->wusb == 1 && udev->authorized == 0) { 1715d9d16e8aSInaky Perez-Gonzalez udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1716d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1717d9d16e8aSInaky Perez-Gonzalez udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1718d9d16e8aSInaky Perez-Gonzalez } 1719d9d16e8aSInaky Perez-Gonzalez else { 1720d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 1721d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 1722d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 1723d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 1724d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 1725d9d16e8aSInaky Perez-Gonzalez } 1726d9d16e8aSInaky Perez-Gonzalez err = usb_configure_device_otg(udev); 1727d9d16e8aSInaky Perez-Gonzalez fail: 1728d9d16e8aSInaky Perez-Gonzalez return err; 1729d9d16e8aSInaky Perez-Gonzalez } 1730d9d16e8aSInaky Perez-Gonzalez 1731d9d16e8aSInaky Perez-Gonzalez 1732d9d16e8aSInaky Perez-Gonzalez /** 1733d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 1734d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 1735d9d16e8aSInaky Perez-Gonzalez * 1736d9d16e8aSInaky Perez-Gonzalez * This is called with devices which have been enumerated, but not yet 1737d9d16e8aSInaky Perez-Gonzalez * configured. The device descriptor is available, but not descriptors 1738d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 1739d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 1740d9d16e8aSInaky Perez-Gonzalez * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 1741d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 1742d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 1743d9d16e8aSInaky Perez-Gonzalez * 1744d9d16e8aSInaky Perez-Gonzalez * It will return if the device is configured properly or not. Zero if 1745d9d16e8aSInaky Perez-Gonzalez * the interface was registered with the driver core; else a negative 1746d9d16e8aSInaky Perez-Gonzalez * errno value. 1747d9d16e8aSInaky Perez-Gonzalez * 1748d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 1749d9d16e8aSInaky Perez-Gonzalez * 1750d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 1751d9d16e8aSInaky Perez-Gonzalez */ 1752d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 1753d9d16e8aSInaky Perez-Gonzalez { 1754d9d16e8aSInaky Perez-Gonzalez int err; 1755d9d16e8aSInaky Perez-Gonzalez 17566cd13201SAlan Stern /* Increment the parent's count of unsuspended children */ 17576cd13201SAlan Stern if (udev->parent) 17586cd13201SAlan Stern usb_autoresume_device(udev->parent); 17596cd13201SAlan Stern 1760d9d16e8aSInaky Perez-Gonzalez usb_detect_quirks(udev); /* Determine quirks */ 1761d9d16e8aSInaky Perez-Gonzalez err = usb_configure_device(udev); /* detect & probe dev/intfs */ 1762d9d16e8aSInaky Perez-Gonzalez if (err < 0) 1763d9d16e8aSInaky Perez-Gonzalez goto fail; 1764c6515272SSarah Sharp dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", 1765c6515272SSarah Sharp udev->devnum, udev->bus->busnum, 1766c6515272SSarah Sharp (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 17679f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 17689f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 17699f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 17709f8b17e6SKay Sievers 17716cd13201SAlan Stern /* Tell the world! */ 17726cd13201SAlan Stern announce_device(udev); 1773195af2ccSAlan Stern 1774782da727SAlan Stern /* Register the device. The device driver is responsible 17753b23dd6fSAlan Stern * for configuring the device and invoking the add-device 17763b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 1777782da727SAlan Stern */ 17781da177e4SLinus Torvalds err = device_add(&udev->dev); 17791da177e4SLinus Torvalds if (err) { 17801da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 17811da177e4SLinus Torvalds goto fail; 17821da177e4SLinus Torvalds } 17839ad3d6ccSAlan Stern 17843b23dd6fSAlan Stern (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); 1785c066475eSGreg Kroah-Hartman return err; 17861da177e4SLinus Torvalds 17871da177e4SLinus Torvalds fail: 17881da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 17896cd13201SAlan Stern usb_stop_pm(udev); 1790d9d16e8aSInaky Perez-Gonzalez return err; 17911da177e4SLinus Torvalds } 17921da177e4SLinus Torvalds 179393993a0aSInaky Perez-Gonzalez 179493993a0aSInaky Perez-Gonzalez /** 1795fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 1796fd39c86bSRandy Dunlap * @usb_dev: USB device 1797fd39c86bSRandy Dunlap * 1798fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 1799fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 180093993a0aSInaky Perez-Gonzalez * 180193993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 180293993a0aSInaky Perez-Gonzalez * defer its call. 180393993a0aSInaky Perez-Gonzalez */ 180493993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 180593993a0aSInaky Perez-Gonzalez { 180693993a0aSInaky Perez-Gonzalez unsigned cnt; 180793993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 180893993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 180993993a0aSInaky Perez-Gonzalez goto out_unauthorized; 181093993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 181193993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 181293993a0aSInaky Perez-Gonzalez usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 181393993a0aSInaky Perez-Gonzalez usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 181493993a0aSInaky Perez-Gonzalez usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 181593993a0aSInaky Perez-Gonzalez kfree(usb_dev->config); 181693993a0aSInaky Perez-Gonzalez usb_dev->config = NULL; 181793993a0aSInaky Perez-Gonzalez for (cnt = 0; cnt < usb_dev->descriptor.bNumConfigurations; cnt++) 181893993a0aSInaky Perez-Gonzalez kfree(usb_dev->rawdescriptors[cnt]); 181993993a0aSInaky Perez-Gonzalez usb_dev->descriptor.bNumConfigurations = 0; 182093993a0aSInaky Perez-Gonzalez kfree(usb_dev->rawdescriptors); 182193993a0aSInaky Perez-Gonzalez out_unauthorized: 182293993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 182393993a0aSInaky Perez-Gonzalez return 0; 182493993a0aSInaky Perez-Gonzalez } 182593993a0aSInaky Perez-Gonzalez 182693993a0aSInaky Perez-Gonzalez 182793993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 182893993a0aSInaky Perez-Gonzalez { 182993993a0aSInaky Perez-Gonzalez int result = 0, c; 183093993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 183193993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 183293993a0aSInaky Perez-Gonzalez goto out_authorized; 183393993a0aSInaky Perez-Gonzalez kfree(usb_dev->product); 183493993a0aSInaky Perez-Gonzalez usb_dev->product = NULL; 183593993a0aSInaky Perez-Gonzalez kfree(usb_dev->manufacturer); 183693993a0aSInaky Perez-Gonzalez usb_dev->manufacturer = NULL; 183793993a0aSInaky Perez-Gonzalez kfree(usb_dev->serial); 183893993a0aSInaky Perez-Gonzalez usb_dev->serial = NULL; 183993993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 184093993a0aSInaky Perez-Gonzalez if (result < 0) { 184193993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 184293993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 184393993a0aSInaky Perez-Gonzalez goto error_autoresume; 184493993a0aSInaky Perez-Gonzalez } 184593993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 184693993a0aSInaky Perez-Gonzalez if (result < 0) { 184793993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 184893993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 184993993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 185093993a0aSInaky Perez-Gonzalez } 185193993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 185293993a0aSInaky Perez-Gonzalez result = usb_configure_device(usb_dev); 185393993a0aSInaky Perez-Gonzalez if (result < 0) 185493993a0aSInaky Perez-Gonzalez goto error_configure; 185593993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 185693993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 185793993a0aSInaky Perez-Gonzalez */ 1858b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 185993993a0aSInaky Perez-Gonzalez if (c >= 0) { 186093993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 186193993a0aSInaky Perez-Gonzalez if (result) { 186293993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 186393993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 186493993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 186593993a0aSInaky Perez-Gonzalez * set other configurations. */ 186693993a0aSInaky Perez-Gonzalez } 186793993a0aSInaky Perez-Gonzalez } 186893993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 186993993a0aSInaky Perez-Gonzalez error_configure: 187093993a0aSInaky Perez-Gonzalez error_device_descriptor: 187193993a0aSInaky Perez-Gonzalez error_autoresume: 187293993a0aSInaky Perez-Gonzalez out_authorized: 187393993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); // complements locktree 187493993a0aSInaky Perez-Gonzalez return result; 187593993a0aSInaky Perez-Gonzalez } 187693993a0aSInaky Perez-Gonzalez 187793993a0aSInaky Perez-Gonzalez 18780165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 18790165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 18800165de09SInaky Perez-Gonzalez { 18810165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 18820165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 18830165de09SInaky Perez-Gonzalez return 0; 18840165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 18850165de09SInaky Perez-Gonzalez return hcd->wireless; 18860165de09SInaky Perez-Gonzalez } 18870165de09SInaky Perez-Gonzalez 18880165de09SInaky Perez-Gonzalez 18891da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 18901da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 18911da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 18921da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 18931da177e4SLinus Torvalds #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) 18941da177e4SLinus Torvalds 18951da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 18961da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 18971da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 18981da177e4SLinus Torvalds #define HUB_RESET_TIMEOUT 500 18991da177e4SLinus Torvalds 19001da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 19011da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 19021da177e4SLinus Torvalds { 19031da177e4SLinus Torvalds int delay_time, ret; 19041da177e4SLinus Torvalds u16 portstatus; 19051da177e4SLinus Torvalds u16 portchange; 19061da177e4SLinus Torvalds 19071da177e4SLinus Torvalds for (delay_time = 0; 19081da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 19091da177e4SLinus Torvalds delay_time += delay) { 19101da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 19111da177e4SLinus Torvalds msleep(delay); 19121da177e4SLinus Torvalds 19131da177e4SLinus Torvalds /* read and decode port status */ 19141da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 19151da177e4SLinus Torvalds if (ret < 0) 19161da177e4SLinus Torvalds return ret; 19171da177e4SLinus Torvalds 19181da177e4SLinus Torvalds /* Device went away? */ 19191da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 19201da177e4SLinus Torvalds return -ENOTCONN; 19211da177e4SLinus Torvalds 1922dd4dd19eSAlan Stern /* bomb out completely if the connection bounced */ 19231da177e4SLinus Torvalds if ((portchange & USB_PORT_STAT_C_CONNECTION)) 1924dd4dd19eSAlan Stern return -ENOTCONN; 19251da177e4SLinus Torvalds 19261da177e4SLinus Torvalds /* if we`ve finished resetting, then break out of the loop */ 19271da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_RESET) && 19281da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_ENABLE)) { 19290165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 19300165de09SInaky Perez-Gonzalez udev->speed = USB_SPEED_VARIABLE; 19310165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 19321da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 19331da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 19341da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 19351da177e4SLinus Torvalds else 19361da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 19371da177e4SLinus Torvalds return 0; 19381da177e4SLinus Torvalds } 19391da177e4SLinus Torvalds 19401da177e4SLinus Torvalds /* switch to the long delay after two short delay failures */ 19411da177e4SLinus Torvalds if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 19421da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 19431da177e4SLinus Torvalds 19441da177e4SLinus Torvalds dev_dbg (hub->intfdev, 19451da177e4SLinus Torvalds "port %d not reset yet, waiting %dms\n", 19461da177e4SLinus Torvalds port1, delay); 19471da177e4SLinus Torvalds } 19481da177e4SLinus Torvalds 19491da177e4SLinus Torvalds return -EBUSY; 19501da177e4SLinus Torvalds } 19511da177e4SLinus Torvalds 19521da177e4SLinus Torvalds static int hub_port_reset(struct usb_hub *hub, int port1, 19531da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 19541da177e4SLinus Torvalds { 19551da177e4SLinus Torvalds int i, status; 19561da177e4SLinus Torvalds 195732fe0198SAlan Stern /* Block EHCI CF initialization during the port reset. 195832fe0198SAlan Stern * Some companion controllers don't like it when they mix. 195932fe0198SAlan Stern */ 196032fe0198SAlan Stern down_read(&ehci_cf_port_reset_rwsem); 196132fe0198SAlan Stern 19621da177e4SLinus Torvalds /* Reset the port */ 19631da177e4SLinus Torvalds for (i = 0; i < PORT_RESET_TRIES; i++) { 19641da177e4SLinus Torvalds status = set_port_feature(hub->hdev, 19651da177e4SLinus Torvalds port1, USB_PORT_FEAT_RESET); 19661da177e4SLinus Torvalds if (status) 19671da177e4SLinus Torvalds dev_err(hub->intfdev, 19681da177e4SLinus Torvalds "cannot reset port %d (err = %d)\n", 19691da177e4SLinus Torvalds port1, status); 19701da177e4SLinus Torvalds else { 19711da177e4SLinus Torvalds status = hub_port_wait_reset(hub, port1, udev, delay); 1972dd16525bSDavid Brownell if (status && status != -ENOTCONN) 19731da177e4SLinus Torvalds dev_dbg(hub->intfdev, 19741da177e4SLinus Torvalds "port_wait_reset: err = %d\n", 19751da177e4SLinus Torvalds status); 19761da177e4SLinus Torvalds } 19771da177e4SLinus Torvalds 19781da177e4SLinus Torvalds /* return on disconnect or reset */ 19791da177e4SLinus Torvalds switch (status) { 19801da177e4SLinus Torvalds case 0: 1981b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 1982b789696aSDavid Brownell msleep(10 + 40); 19834953d141SDavid Vrabel update_address(udev, 0); 19841da177e4SLinus Torvalds /* FALL THROUGH */ 19851da177e4SLinus Torvalds case -ENOTCONN: 19861da177e4SLinus Torvalds case -ENODEV: 19871da177e4SLinus Torvalds clear_port_feature(hub->hdev, 19881da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 19891da177e4SLinus Torvalds /* FIXME need disconnect() for NOTATTACHED device */ 19901da177e4SLinus Torvalds usb_set_device_state(udev, status 19911da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 19921da177e4SLinus Torvalds : USB_STATE_DEFAULT); 199332fe0198SAlan Stern goto done; 19941da177e4SLinus Torvalds } 19951da177e4SLinus Torvalds 19961da177e4SLinus Torvalds dev_dbg (hub->intfdev, 19971da177e4SLinus Torvalds "port %d not enabled, trying reset again...\n", 19981da177e4SLinus Torvalds port1); 19991da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 20001da177e4SLinus Torvalds } 20011da177e4SLinus Torvalds 20021da177e4SLinus Torvalds dev_err (hub->intfdev, 20031da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 20041da177e4SLinus Torvalds port1); 20051da177e4SLinus Torvalds 200632fe0198SAlan Stern done: 200732fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 20081da177e4SLinus Torvalds return status; 20091da177e4SLinus Torvalds } 20101da177e4SLinus Torvalds 2011d388dab7SAlan Stern #ifdef CONFIG_PM 20121da177e4SLinus Torvalds 2013b01b03f3SAlan Stern #define MASK_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | \ 2014b01b03f3SAlan Stern USB_PORT_STAT_SUSPEND) 2015b01b03f3SAlan Stern #define WANT_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION) 2016b01b03f3SAlan Stern 2017b01b03f3SAlan Stern /* Determine whether the device on a port is ready for a normal resume, 2018b01b03f3SAlan Stern * is ready for a reset-resume, or should be disconnected. 2019b01b03f3SAlan Stern */ 2020b01b03f3SAlan Stern static int check_port_resume_type(struct usb_device *udev, 2021b01b03f3SAlan Stern struct usb_hub *hub, int port1, 2022b01b03f3SAlan Stern int status, unsigned portchange, unsigned portstatus) 2023b01b03f3SAlan Stern { 2024b01b03f3SAlan Stern /* Is the device still present? */ 2025b01b03f3SAlan Stern if (status || (portstatus & MASK_BITS) != WANT_BITS) { 2026b01b03f3SAlan Stern if (status >= 0) 2027b01b03f3SAlan Stern status = -ENODEV; 2028b01b03f3SAlan Stern } 2029b01b03f3SAlan Stern 203086c57edfSAlan Stern /* Can't do a normal resume if the port isn't enabled, 203186c57edfSAlan Stern * so try a reset-resume instead. 203286c57edfSAlan Stern */ 203386c57edfSAlan Stern else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { 203486c57edfSAlan Stern if (udev->persist_enabled) 203586c57edfSAlan Stern udev->reset_resume = 1; 203686c57edfSAlan Stern else 2037b01b03f3SAlan Stern status = -ENODEV; 203886c57edfSAlan Stern } 2039b01b03f3SAlan Stern 2040b01b03f3SAlan Stern if (status) { 2041b01b03f3SAlan Stern dev_dbg(hub->intfdev, 2042b01b03f3SAlan Stern "port %d status %04x.%04x after resume, %d\n", 2043b01b03f3SAlan Stern port1, portchange, portstatus, status); 2044b01b03f3SAlan Stern } else if (udev->reset_resume) { 2045b01b03f3SAlan Stern 2046b01b03f3SAlan Stern /* Late port handoff can set status-change bits */ 2047b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) 2048b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2049b01b03f3SAlan Stern USB_PORT_FEAT_C_CONNECTION); 2050b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) 2051b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2052b01b03f3SAlan Stern USB_PORT_FEAT_C_ENABLE); 2053b01b03f3SAlan Stern } 2054b01b03f3SAlan Stern 2055b01b03f3SAlan Stern return status; 2056b01b03f3SAlan Stern } 2057b01b03f3SAlan Stern 20581da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 20591da177e4SLinus Torvalds 20601da177e4SLinus Torvalds /* 2061140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 2062624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 20635edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 20641da177e4SLinus Torvalds * 20651da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 20661da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 20671da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 2068140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 20691da177e4SLinus Torvalds * to disconnect devices while they are suspended. 20701da177e4SLinus Torvalds * 2071390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 2072390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 2073390a8c34SDavid Brownell * 2074624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 2075624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 2076624d6c07SAlan Stern * All devices below the suspended port are also suspended. 2077624d6c07SAlan Stern * 2078624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 2079624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 2080624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 2081624d6c07SAlan Stern * some cases, this wakes the USB host. 2082624d6c07SAlan Stern * 20831da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 20841da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 20851da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 20861da177e4SLinus Torvalds * 20874956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 20884956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 20894956eccdSAlan Stern * State transitions include: 20904956eccdSAlan Stern * 20914956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 20924956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 20934956eccdSAlan Stern * 20944956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 20954956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 20964956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 20974956eccdSAlan Stern * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 20984956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 20994956eccdSAlan Stern * 21004956eccdSAlan Stern * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when 21014956eccdSAlan Stern * the root hub for their bus goes into global suspend ... so we don't 21024956eccdSAlan Stern * (falsely) update the device power state to say it suspended. 21034956eccdSAlan Stern * 21041da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 21051da177e4SLinus Torvalds */ 210665bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 21071da177e4SLinus Torvalds { 2108624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2109624d6c07SAlan Stern int port1 = udev->portnum; 2110624d6c07SAlan Stern int status; 21114956eccdSAlan Stern 2112624d6c07SAlan Stern // dev_dbg(hub->intfdev, "suspend port %d\n", port1); 2113624d6c07SAlan Stern 2114624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 2115624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 2116624d6c07SAlan Stern * 2117624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 2118624d6c07SAlan Stern * we don't explicitly enable it here. 2119624d6c07SAlan Stern */ 2120624d6c07SAlan Stern if (udev->do_remote_wakeup) { 2121624d6c07SAlan Stern status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2122624d6c07SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 2123624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 2124624d6c07SAlan Stern NULL, 0, 2125624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 2126624d6c07SAlan Stern if (status) 2127624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 2128624d6c07SAlan Stern status); 2129624d6c07SAlan Stern } 2130624d6c07SAlan Stern 2131624d6c07SAlan Stern /* see 7.1.7.6 */ 2132624d6c07SAlan Stern status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); 2133624d6c07SAlan Stern if (status) { 2134624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", 2135624d6c07SAlan Stern port1, status); 2136624d6c07SAlan Stern /* paranoia: "should not happen" */ 2137624d6c07SAlan Stern (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2138624d6c07SAlan Stern USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 2139624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 2140624d6c07SAlan Stern NULL, 0, 2141624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 2142624d6c07SAlan Stern } else { 2143624d6c07SAlan Stern /* device has up to 10 msec to fully suspend */ 2144624d6c07SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend\n", 214565bfd296SAlan Stern (msg.event & PM_EVENT_AUTO ? "auto-" : "")); 2146624d6c07SAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 2147624d6c07SAlan Stern msleep(10); 2148624d6c07SAlan Stern } 21494956eccdSAlan Stern return status; 21501da177e4SLinus Torvalds } 2151f3f3253dSDavid Brownell 21521da177e4SLinus Torvalds /* 2153390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 2154390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 215554515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 21561da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 21571da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 21581da177e4SLinus Torvalds * in the tree that's rooted at this device. 215954515fe5SAlan Stern * 216054515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 216154515fe5SAlan Stern * status check is done. 21621da177e4SLinus Torvalds */ 2163140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 21641da177e4SLinus Torvalds { 216554515fe5SAlan Stern int status = 0; 21661da177e4SLinus Torvalds u16 devstatus; 21671da177e4SLinus Torvalds 21681da177e4SLinus Torvalds /* caller owns the udev device lock */ 2169b9cef6c3SWu Fengguang dev_dbg(&udev->dev, "%s\n", 2170b9cef6c3SWu Fengguang udev->reset_resume ? "finish reset-resume" : "finish resume"); 21711da177e4SLinus Torvalds 21721da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 21731da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 21741da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 21751da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 21761da177e4SLinus Torvalds */ 21771da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 21781da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 21791da177e4SLinus Torvalds : USB_STATE_ADDRESS); 21801da177e4SLinus Torvalds 218154515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 218254515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 218354515fe5SAlan Stern * operation is carried out here, after the port has been 218454515fe5SAlan Stern * resumed. 218554515fe5SAlan Stern */ 218654515fe5SAlan Stern if (udev->reset_resume) 218786c57edfSAlan Stern retry_reset_resume: 2188742120c6SMing Lei status = usb_reset_and_verify_device(udev); 218954515fe5SAlan Stern 21901da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 21911da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 21921da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 21931da177e4SLinus Torvalds */ 219454515fe5SAlan Stern if (status == 0) { 219546dede46SAlan Stern devstatus = 0; 21961da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 2197b40b7a90SAlan Stern if (status >= 0) 219846dede46SAlan Stern status = (status > 0 ? 0 : -ENODEV); 219986c57edfSAlan Stern 220086c57edfSAlan Stern /* If a normal resume failed, try doing a reset-resume */ 220186c57edfSAlan Stern if (status && !udev->reset_resume && udev->persist_enabled) { 220286c57edfSAlan Stern dev_dbg(&udev->dev, "retry with reset-resume\n"); 220386c57edfSAlan Stern udev->reset_resume = 1; 220486c57edfSAlan Stern goto retry_reset_resume; 220586c57edfSAlan Stern } 220654515fe5SAlan Stern } 2207b40b7a90SAlan Stern 2208624d6c07SAlan Stern if (status) { 2209624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 22101da177e4SLinus Torvalds status); 2211624d6c07SAlan Stern } else if (udev->actconfig) { 22121da177e4SLinus Torvalds le16_to_cpus(&devstatus); 2213686314cfSAlan Stern if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { 22141da177e4SLinus Torvalds status = usb_control_msg(udev, 22151da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 22161da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, 22171da177e4SLinus Torvalds USB_RECIP_DEVICE, 22181da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 22191da177e4SLinus Torvalds NULL, 0, 22201da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 2221a8e7c565SAlan Stern if (status) 2222b9cef6c3SWu Fengguang dev_dbg(&udev->dev, 2223b9cef6c3SWu Fengguang "disable remote wakeup, status %d\n", 2224b9cef6c3SWu Fengguang status); 22254bf0ba86SAlan Stern } 22261da177e4SLinus Torvalds status = 0; 22271da177e4SLinus Torvalds } 22281da177e4SLinus Torvalds return status; 22291da177e4SLinus Torvalds } 22301da177e4SLinus Torvalds 2231624d6c07SAlan Stern /* 2232624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 2233624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 2234624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 2235624d6c07SAlan Stern * 2236624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 2237624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 2238624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 2239624d6c07SAlan Stern * the host and the device is the same as it was when the device 2240624d6c07SAlan Stern * suspended. 2241624d6c07SAlan Stern * 2242feccc30dSAlan Stern * If @udev->reset_resume is set then this routine won't check that the 2243feccc30dSAlan Stern * port is still enabled. Furthermore, finish_port_resume() above will 224454515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 224554515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 224654515fe5SAlan Stern * 224754515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 224854515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 224954515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 225054515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 225154515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 225254515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 225354515fe5SAlan Stern * made to appear as if it had not disconnected. 225454515fe5SAlan Stern * 2255742120c6SMing Lei * This facility can be dangerous. Although usb_reset_and_verify_device() makes 2256feccc30dSAlan Stern * every effort to insure that the same device is present after the 225754515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 225854515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 225954515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 226054515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 226154515fe5SAlan Stern * new card is corrupted and the system crashes. 226254515fe5SAlan Stern * 2263624d6c07SAlan Stern * Returns 0 on success, else negative errno. 2264624d6c07SAlan Stern */ 226565bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 22661da177e4SLinus Torvalds { 2267624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2268624d6c07SAlan Stern int port1 = udev->portnum; 22691da177e4SLinus Torvalds int status; 2270d25450c6SAlan Stern u16 portchange, portstatus; 2271d25450c6SAlan Stern 2272d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 2273d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 2274d25450c6SAlan Stern if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND)) 2275d25450c6SAlan Stern goto SuspendCleared; 22761da177e4SLinus Torvalds 22771da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "resume port %d\n", port1); 22781da177e4SLinus Torvalds 2279d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 2280d5cbad4bSAlan Stern 22811da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 22821da177e4SLinus Torvalds status = clear_port_feature(hub->hdev, 22831da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 22841da177e4SLinus Torvalds if (status) { 2285624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", 22861da177e4SLinus Torvalds port1, status); 22871da177e4SLinus Torvalds } else { 22881da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 2289645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 229065bfd296SAlan Stern (msg.event & PM_EVENT_AUTO ? "auto-" : "")); 22911da177e4SLinus Torvalds msleep(25); 22921da177e4SLinus Torvalds 22931da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 22941da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 22951da177e4SLinus Torvalds * sequence. 22961da177e4SLinus Torvalds */ 2297d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 229854515fe5SAlan Stern 22991da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 23001da177e4SLinus Torvalds msleep(10); 23011da177e4SLinus Torvalds } 2302b01b03f3SAlan Stern 2303b01b03f3SAlan Stern SuspendCleared: 2304b01b03f3SAlan Stern if (status == 0) { 2305b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 2306b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2307b01b03f3SAlan Stern USB_PORT_FEAT_C_SUSPEND); 23081da177e4SLinus Torvalds } 23091da177e4SLinus Torvalds 2310d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 2311d5cbad4bSAlan Stern 2312b01b03f3SAlan Stern status = check_port_resume_type(udev, 2313b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 231454515fe5SAlan Stern if (status == 0) 231554515fe5SAlan Stern status = finish_port_resume(udev); 231654515fe5SAlan Stern if (status < 0) { 231754515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 231854515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 231954515fe5SAlan Stern } 23201da177e4SLinus Torvalds return status; 23211da177e4SLinus Torvalds } 23221da177e4SLinus Torvalds 23238808f00cSAlan Stern /* caller has locked udev */ 23241da177e4SLinus Torvalds static int remote_wakeup(struct usb_device *udev) 23251da177e4SLinus Torvalds { 23261da177e4SLinus Torvalds int status = 0; 23271da177e4SLinus Torvalds 23281da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 2329645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 23301941044aSAlan Stern usb_mark_last_busy(udev); 233165bfd296SAlan Stern status = usb_external_resume_device(udev, PMSG_REMOTE_RESUME); 2332d25450c6SAlan Stern } 23331da177e4SLinus Torvalds return status; 23341da177e4SLinus Torvalds } 23351da177e4SLinus Torvalds 2336d388dab7SAlan Stern #else /* CONFIG_USB_SUSPEND */ 2337d388dab7SAlan Stern 2338d388dab7SAlan Stern /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ 2339d388dab7SAlan Stern 234065bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 2341d388dab7SAlan Stern { 2342d388dab7SAlan Stern return 0; 2343d388dab7SAlan Stern } 2344d388dab7SAlan Stern 2345b01b03f3SAlan Stern /* However we may need to do a reset-resume */ 2346b01b03f3SAlan Stern 234765bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 2348d388dab7SAlan Stern { 2349b01b03f3SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2350b01b03f3SAlan Stern int port1 = udev->portnum; 2351b01b03f3SAlan Stern int status; 2352b01b03f3SAlan Stern u16 portchange, portstatus; 235354515fe5SAlan Stern 2354b01b03f3SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 2355b01b03f3SAlan Stern status = check_port_resume_type(udev, 2356b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 2357b01b03f3SAlan Stern 2358b01b03f3SAlan Stern if (status) { 2359b01b03f3SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 2360b01b03f3SAlan Stern hub_port_logical_disconnect(hub, port1); 2361b01b03f3SAlan Stern } else if (udev->reset_resume) { 236254515fe5SAlan Stern dev_dbg(&udev->dev, "reset-resume\n"); 2363742120c6SMing Lei status = usb_reset_and_verify_device(udev); 236454515fe5SAlan Stern } 236554515fe5SAlan Stern return status; 2366d388dab7SAlan Stern } 2367d388dab7SAlan Stern 2368d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 2369d388dab7SAlan Stern { 2370d388dab7SAlan Stern return 0; 2371d388dab7SAlan Stern } 2372d388dab7SAlan Stern 2373d388dab7SAlan Stern #endif 2374d388dab7SAlan Stern 2375db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 23761da177e4SLinus Torvalds { 23771da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 23781da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 23791da177e4SLinus Torvalds unsigned port1; 23801da177e4SLinus Torvalds 2381c9f89fa4SDavid Brownell /* fail if children aren't already suspended */ 23821da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 23831da177e4SLinus Torvalds struct usb_device *udev; 23841da177e4SLinus Torvalds 23851da177e4SLinus Torvalds udev = hdev->children [port1-1]; 23866840d255SAlan Stern if (udev && udev->can_submit) { 238765bfd296SAlan Stern if (!(msg.event & PM_EVENT_AUTO)) 2388645daaabSAlan Stern dev_dbg(&intf->dev, "port %d nyet suspended\n", 2389645daaabSAlan Stern port1); 2390c9f89fa4SDavid Brownell return -EBUSY; 2391c9f89fa4SDavid Brownell } 23921da177e4SLinus Torvalds } 23931da177e4SLinus Torvalds 2394441b62c1SHarvey Harrison dev_dbg(&intf->dev, "%s\n", __func__); 239540f122f3SAlan Stern 2396c9f89fa4SDavid Brownell /* stop khubd and related activity */ 23974330354fSAlan Stern hub_quiesce(hub, HUB_SUSPEND); 2398b6f6436dSAlan Stern return 0; 23991da177e4SLinus Torvalds } 24001da177e4SLinus Torvalds 24011da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 24021da177e4SLinus Torvalds { 24031da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 24041da177e4SLinus Torvalds 24055e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 2406f2835219SAlan Stern hub_activate(hub, HUB_RESUME); 24071da177e4SLinus Torvalds return 0; 24081da177e4SLinus Torvalds } 24091da177e4SLinus Torvalds 2410b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 2411f07600cfSAlan Stern { 2412b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 2413f07600cfSAlan Stern 24145e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 2415f2835219SAlan Stern hub_activate(hub, HUB_RESET_RESUME); 2416f07600cfSAlan Stern return 0; 2417f07600cfSAlan Stern } 2418f07600cfSAlan Stern 241954515fe5SAlan Stern /** 242054515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 242154515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 242254515fe5SAlan Stern * 242354515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 242454515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 2425feccc30dSAlan Stern * has been reset. The routine marks @rhdev as having lost power. 2426feccc30dSAlan Stern * When the hub driver is resumed it will take notice and carry out 2427feccc30dSAlan Stern * power-session recovery for all the "USB-PERSIST"-enabled child devices; 2428feccc30dSAlan Stern * the others will be disconnected. 242954515fe5SAlan Stern */ 243054515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 243154515fe5SAlan Stern { 243254515fe5SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 243354515fe5SAlan Stern rhdev->reset_resume = 1; 243454515fe5SAlan Stern } 243554515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 243654515fe5SAlan Stern 2437d388dab7SAlan Stern #else /* CONFIG_PM */ 2438d388dab7SAlan Stern 2439d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 2440d388dab7SAlan Stern { 2441d388dab7SAlan Stern return 0; 2442d388dab7SAlan Stern } 2443d388dab7SAlan Stern 2444511366daSAndrew Morton #define hub_suspend NULL 2445511366daSAndrew Morton #define hub_resume NULL 2446f07600cfSAlan Stern #define hub_reset_resume NULL 2447d388dab7SAlan Stern #endif 2448d388dab7SAlan Stern 24491da177e4SLinus Torvalds 24501da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 24511da177e4SLinus Torvalds * 24521da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 24531da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 24541da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 24551da177e4SLinus Torvalds * 24561da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 24571da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 24581da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 24591da177e4SLinus Torvalds * 24601da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 24611da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 24621da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 24631da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 24641da177e4SLinus Torvalds */ 24651da177e4SLinus Torvalds static int hub_port_debounce(struct usb_hub *hub, int port1) 24661da177e4SLinus Torvalds { 24671da177e4SLinus Torvalds int ret; 24681da177e4SLinus Torvalds int total_time, stable_time = 0; 24691da177e4SLinus Torvalds u16 portchange, portstatus; 24701da177e4SLinus Torvalds unsigned connection = 0xffff; 24711da177e4SLinus Torvalds 24721da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 24731da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 24741da177e4SLinus Torvalds if (ret < 0) 24751da177e4SLinus Torvalds return ret; 24761da177e4SLinus Torvalds 24771da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 24781da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 24791da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 24801da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 24811da177e4SLinus Torvalds break; 24821da177e4SLinus Torvalds } else { 24831da177e4SLinus Torvalds stable_time = 0; 24841da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 24851da177e4SLinus Torvalds } 24861da177e4SLinus Torvalds 24871da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 24881da177e4SLinus Torvalds clear_port_feature(hub->hdev, port1, 24891da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 24901da177e4SLinus Torvalds } 24911da177e4SLinus Torvalds 24921da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 24931da177e4SLinus Torvalds break; 24941da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 24951da177e4SLinus Torvalds } 24961da177e4SLinus Torvalds 24971da177e4SLinus Torvalds dev_dbg (hub->intfdev, 24981da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 24991da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 25001da177e4SLinus Torvalds 25011da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 25021da177e4SLinus Torvalds return -ETIMEDOUT; 25031da177e4SLinus Torvalds return portstatus; 25041da177e4SLinus Torvalds } 25051da177e4SLinus Torvalds 2506fc721f51SInaky Perez-Gonzalez void usb_ep0_reinit(struct usb_device *udev) 25071da177e4SLinus Torvalds { 2508ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); 2509ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); 25102caf7fcdSAlan Stern usb_enable_endpoint(udev, &udev->ep0, true); 25111da177e4SLinus Torvalds } 2512fc721f51SInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_ep0_reinit); 25131da177e4SLinus Torvalds 25141da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 25151da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 25161da177e4SLinus Torvalds 25174326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 25181da177e4SLinus Torvalds { 25191da177e4SLinus Torvalds int retval; 2520c6515272SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 25211da177e4SLinus Torvalds 2522c6515272SSarah Sharp /* 2523c6515272SSarah Sharp * The host controller will choose the device address, 2524c6515272SSarah Sharp * instead of the core having chosen it earlier 2525c6515272SSarah Sharp */ 2526c6515272SSarah Sharp if (!hcd->driver->address_device && devnum <= 1) 25271da177e4SLinus Torvalds return -EINVAL; 25281da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 25291da177e4SLinus Torvalds return 0; 25301da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 25311da177e4SLinus Torvalds return -EINVAL; 2532c6515272SSarah Sharp if (hcd->driver->address_device) { 2533c6515272SSarah Sharp retval = hcd->driver->address_device(hcd, udev); 2534c6515272SSarah Sharp } else { 25351da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 25364326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 25371da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 2538c6515272SSarah Sharp if (retval == 0) 2539c6515272SSarah Sharp update_address(udev, devnum); 2540c6515272SSarah Sharp } 25411da177e4SLinus Torvalds if (retval == 0) { 25424953d141SDavid Vrabel /* Device now using proper address. */ 25431da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 2544fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 25451da177e4SLinus Torvalds } 25461da177e4SLinus Torvalds return retval; 25471da177e4SLinus Torvalds } 25481da177e4SLinus Torvalds 25491da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 25501da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 25511da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 25521da177e4SLinus Torvalds * 25531da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 2554742120c6SMing Lei * usb_reset_and_verify_device), the caller must own the device lock. For a 25551da177e4SLinus Torvalds * newly detected device that is not accessible through any global 25561da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 25571da177e4SLinus Torvalds */ 25581da177e4SLinus Torvalds static int 25591da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 25601da177e4SLinus Torvalds int retry_counter) 25611da177e4SLinus Torvalds { 25624186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 25631da177e4SLinus Torvalds 25641da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 2565e7b77172SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 25661da177e4SLinus Torvalds int i, j, retval; 25671da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 25681da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 256983a07196SInaky Perez-Gonzalez char *speed, *type; 25704326ed0bSAlan Stern int devnum = udev->devnum; 25711da177e4SLinus Torvalds 25721da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 25731da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 25741da177e4SLinus Torvalds */ 25751da177e4SLinus Torvalds if (!hdev->parent) { 25761da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 25771da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 25781da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 25791da177e4SLinus Torvalds } 25801da177e4SLinus Torvalds 25811da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 25821da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 25831da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 25841da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 25851da177e4SLinus Torvalds 25864186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 25871da177e4SLinus Torvalds 2588e7b77172SSarah Sharp if ((hcd->driver->flags & HCD_USB3) && udev->config) { 2589e7b77172SSarah Sharp /* FIXME this will need special handling by the xHCI driver. */ 2590e7b77172SSarah Sharp dev_dbg(&udev->dev, 2591e7b77172SSarah Sharp "xHCI reset of configured device " 2592e7b77172SSarah Sharp "not supported yet.\n"); 2593e7b77172SSarah Sharp retval = -EINVAL; 2594e7b77172SSarah Sharp goto fail; 2595e7b77172SSarah Sharp } else if (!udev->config && oldspeed == USB_SPEED_SUPER) { 2596e7b77172SSarah Sharp /* Don't reset USB 3.0 devices during an initial setup */ 2597e7b77172SSarah Sharp usb_set_device_state(udev, USB_STATE_DEFAULT); 2598e7b77172SSarah Sharp } else { 25991da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 2600e7b77172SSarah Sharp /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ 26011da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 26021da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 26031da177e4SLinus Torvalds goto fail; 26041da177e4SLinus Torvalds /* success, speed is known */ 2605e7b77172SSarah Sharp } 26061da177e4SLinus Torvalds retval = -ENODEV; 26071da177e4SLinus Torvalds 26081da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 26091da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 26101da177e4SLinus Torvalds goto fail; 26111da177e4SLinus Torvalds } 26121da177e4SLinus Torvalds oldspeed = udev->speed; 26131da177e4SLinus Torvalds 26141da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 26151da177e4SLinus Torvalds * it's fixed size except for full speed devices. 26165bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 26175bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 26181da177e4SLinus Torvalds */ 26191da177e4SLinus Torvalds switch (udev->speed) { 26206b403b02SSarah Sharp case USB_SPEED_SUPER: 26215bb6e0aeSInaky Perez-Gonzalez case USB_SPEED_VARIABLE: /* fixed at 512 */ 2622551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); 26235bb6e0aeSInaky Perez-Gonzalez break; 26241da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 2625551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 26261da177e4SLinus Torvalds break; 26271da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 26281da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 26291da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 26301da177e4SLinus Torvalds * then correct our initial guess. 26311da177e4SLinus Torvalds */ 2632551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 26331da177e4SLinus Torvalds break; 26341da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 2635551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); 26361da177e4SLinus Torvalds break; 26371da177e4SLinus Torvalds default: 26381da177e4SLinus Torvalds goto fail; 26391da177e4SLinus Torvalds } 26401da177e4SLinus Torvalds 264183a07196SInaky Perez-Gonzalez type = ""; 264283a07196SInaky Perez-Gonzalez switch (udev->speed) { 26431da177e4SLinus Torvalds case USB_SPEED_LOW: speed = "low"; break; 26441da177e4SLinus Torvalds case USB_SPEED_FULL: speed = "full"; break; 26451da177e4SLinus Torvalds case USB_SPEED_HIGH: speed = "high"; break; 26466b403b02SSarah Sharp case USB_SPEED_SUPER: 26476b403b02SSarah Sharp speed = "super"; 26486b403b02SSarah Sharp break; 264983a07196SInaky Perez-Gonzalez case USB_SPEED_VARIABLE: 265083a07196SInaky Perez-Gonzalez speed = "variable"; 265183a07196SInaky Perez-Gonzalez type = "Wireless "; 265283a07196SInaky Perez-Gonzalez break; 26531da177e4SLinus Torvalds default: speed = "?"; break; 265483a07196SInaky Perez-Gonzalez } 2655c6515272SSarah Sharp if (udev->speed != USB_SPEED_SUPER) 265683a07196SInaky Perez-Gonzalez dev_info(&udev->dev, 265783a07196SInaky Perez-Gonzalez "%s %s speed %sUSB device using %s and address %d\n", 265883a07196SInaky Perez-Gonzalez (udev->config) ? "reset" : "new", speed, type, 26594326ed0bSAlan Stern udev->bus->controller->driver->name, devnum); 26601da177e4SLinus Torvalds 26611da177e4SLinus Torvalds /* Set up TT records, if needed */ 26621da177e4SLinus Torvalds if (hdev->tt) { 26631da177e4SLinus Torvalds udev->tt = hdev->tt; 26641da177e4SLinus Torvalds udev->ttport = hdev->ttport; 26651da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 26661da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 26671da177e4SLinus Torvalds udev->tt = &hub->tt; 26681da177e4SLinus Torvalds udev->ttport = port1; 26691da177e4SLinus Torvalds } 26701da177e4SLinus Torvalds 26711da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 26721da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 26731da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 26741da177e4SLinus Torvalds * Change it cautiously. 26751da177e4SLinus Torvalds * 26761da177e4SLinus Torvalds * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 26771da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 26781da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 26791da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 26801da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 26811da177e4SLinus Torvalds * value. 26821da177e4SLinus Torvalds */ 26831da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 2684c6515272SSarah Sharp /* 2685c6515272SSarah Sharp * An xHCI controller cannot send any packets to a device until 2686c6515272SSarah Sharp * a set address command successfully completes. 2687c6515272SSarah Sharp */ 2688c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) { 26891da177e4SLinus Torvalds struct usb_device_descriptor *buf; 26901da177e4SLinus Torvalds int r = 0; 26911da177e4SLinus Torvalds 26921da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 26931da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 26941da177e4SLinus Torvalds if (!buf) { 26951da177e4SLinus Torvalds retval = -ENOMEM; 26961da177e4SLinus Torvalds continue; 26971da177e4SLinus Torvalds } 26981da177e4SLinus Torvalds 2699b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 2700b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 2701b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 27021da177e4SLinus Torvalds */ 27031da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 27041da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 27051da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 27061da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 27071da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 27081da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 2709fd7c519dSJaroslav Kysela initial_descriptor_timeout); 27101da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 27115bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 27121da177e4SLinus Torvalds if (buf->bDescriptorType == 27131da177e4SLinus Torvalds USB_DT_DEVICE) { 27141da177e4SLinus Torvalds r = 0; 27151da177e4SLinus Torvalds break; 27161da177e4SLinus Torvalds } 27171da177e4SLinus Torvalds /* FALL THROUGH */ 27181da177e4SLinus Torvalds default: 27191da177e4SLinus Torvalds if (r == 0) 27201da177e4SLinus Torvalds r = -EPROTO; 27211da177e4SLinus Torvalds break; 27221da177e4SLinus Torvalds } 27231da177e4SLinus Torvalds if (r == 0) 27241da177e4SLinus Torvalds break; 27251da177e4SLinus Torvalds } 27261da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 27271da177e4SLinus Torvalds buf->bMaxPacketSize0; 27281da177e4SLinus Torvalds kfree(buf); 27291da177e4SLinus Torvalds 27301da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 27311da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 27321da177e4SLinus Torvalds goto fail; 27331da177e4SLinus Torvalds if (oldspeed != udev->speed) { 27341da177e4SLinus Torvalds dev_dbg(&udev->dev, 27351da177e4SLinus Torvalds "device reset changed speed!\n"); 27361da177e4SLinus Torvalds retval = -ENODEV; 27371da177e4SLinus Torvalds goto fail; 27381da177e4SLinus Torvalds } 27391da177e4SLinus Torvalds if (r) { 2740b9cef6c3SWu Fengguang dev_err(&udev->dev, 2741b9cef6c3SWu Fengguang "device descriptor read/64, error %d\n", 2742b9cef6c3SWu Fengguang r); 27431da177e4SLinus Torvalds retval = -EMSGSIZE; 27441da177e4SLinus Torvalds continue; 27451da177e4SLinus Torvalds } 27461da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 27471da177e4SLinus Torvalds } 27481da177e4SLinus Torvalds 27496c529cdcSInaky Perez-Gonzalez /* 27506c529cdcSInaky Perez-Gonzalez * If device is WUSB, we already assigned an 27516c529cdcSInaky Perez-Gonzalez * unauthorized address in the Connect Ack sequence; 27526c529cdcSInaky Perez-Gonzalez * authorization will assign the final address. 27536c529cdcSInaky Perez-Gonzalez */ 27546c529cdcSInaky Perez-Gonzalez if (udev->wusb == 0) { 27551da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 27564326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 27571da177e4SLinus Torvalds if (retval >= 0) 27581da177e4SLinus Torvalds break; 27591da177e4SLinus Torvalds msleep(200); 27601da177e4SLinus Torvalds } 27611da177e4SLinus Torvalds if (retval < 0) { 27621da177e4SLinus Torvalds dev_err(&udev->dev, 27631da177e4SLinus Torvalds "device not accepting address %d, error %d\n", 27644326ed0bSAlan Stern devnum, retval); 27651da177e4SLinus Torvalds goto fail; 27661da177e4SLinus Torvalds } 2767c6515272SSarah Sharp if (udev->speed == USB_SPEED_SUPER) { 2768c6515272SSarah Sharp devnum = udev->devnum; 2769c6515272SSarah Sharp dev_info(&udev->dev, 2770c6515272SSarah Sharp "%s SuperSpeed USB device using %s and address %d\n", 2771c6515272SSarah Sharp (udev->config) ? "reset" : "new", 2772c6515272SSarah Sharp udev->bus->controller->driver->name, devnum); 2773c6515272SSarah Sharp } 27741da177e4SLinus Torvalds 27751da177e4SLinus Torvalds /* cope with hardware quirkiness: 27761da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 27771da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 27781da177e4SLinus Torvalds */ 27791da177e4SLinus Torvalds msleep(10); 2780c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) 27811da177e4SLinus Torvalds break; 27826c529cdcSInaky Perez-Gonzalez } 27831da177e4SLinus Torvalds 27841da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 27851da177e4SLinus Torvalds if (retval < 8) { 2786b9cef6c3SWu Fengguang dev_err(&udev->dev, 2787b9cef6c3SWu Fengguang "device descriptor read/8, error %d\n", 2788b9cef6c3SWu Fengguang retval); 27891da177e4SLinus Torvalds if (retval >= 0) 27901da177e4SLinus Torvalds retval = -EMSGSIZE; 27911da177e4SLinus Torvalds } else { 27921da177e4SLinus Torvalds retval = 0; 27931da177e4SLinus Torvalds break; 27941da177e4SLinus Torvalds } 27951da177e4SLinus Torvalds } 27961da177e4SLinus Torvalds if (retval) 27971da177e4SLinus Torvalds goto fail; 27981da177e4SLinus Torvalds 27996b403b02SSarah Sharp if (udev->descriptor.bMaxPacketSize0 == 0xff || 28006b403b02SSarah Sharp udev->speed == USB_SPEED_SUPER) 28016b403b02SSarah Sharp i = 512; 28026b403b02SSarah Sharp else 28036b403b02SSarah Sharp i = udev->descriptor.bMaxPacketSize0; 28041da177e4SLinus Torvalds if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { 28051da177e4SLinus Torvalds if (udev->speed != USB_SPEED_FULL || 28061da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 28071da177e4SLinus Torvalds dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); 28081da177e4SLinus Torvalds retval = -EMSGSIZE; 28091da177e4SLinus Torvalds goto fail; 28101da177e4SLinus Torvalds } 28111da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 28121da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 2813fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 28141da177e4SLinus Torvalds } 28151da177e4SLinus Torvalds 28161da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 28171da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 2818b9cef6c3SWu Fengguang dev_err(&udev->dev, "device descriptor read/all, error %d\n", 2819b9cef6c3SWu Fengguang retval); 28201da177e4SLinus Torvalds if (retval >= 0) 28211da177e4SLinus Torvalds retval = -ENOMSG; 28221da177e4SLinus Torvalds goto fail; 28231da177e4SLinus Torvalds } 28241da177e4SLinus Torvalds 28251da177e4SLinus Torvalds retval = 0; 28261da177e4SLinus Torvalds 28271da177e4SLinus Torvalds fail: 28284326ed0bSAlan Stern if (retval) { 28291da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 28304953d141SDavid Vrabel update_address(udev, devnum); /* for disconnect processing */ 28314326ed0bSAlan Stern } 28324186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 28331da177e4SLinus Torvalds return retval; 28341da177e4SLinus Torvalds } 28351da177e4SLinus Torvalds 28361da177e4SLinus Torvalds static void 28371da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 28381da177e4SLinus Torvalds { 28391da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 28401da177e4SLinus Torvalds int status; 28411da177e4SLinus Torvalds 2842e94b1766SChristoph Lameter qual = kmalloc (sizeof *qual, GFP_KERNEL); 28431da177e4SLinus Torvalds if (qual == NULL) 28441da177e4SLinus Torvalds return; 28451da177e4SLinus Torvalds 28461da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 28471da177e4SLinus Torvalds qual, sizeof *qual); 28481da177e4SLinus Torvalds if (status == sizeof *qual) { 28491da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 28501da177e4SLinus Torvalds "connect to a high speed hub\n"); 28511da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 28521da177e4SLinus Torvalds if (hub->has_indicators) { 28531da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 2854c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 28551da177e4SLinus Torvalds } 28561da177e4SLinus Torvalds } 28571da177e4SLinus Torvalds kfree(qual); 28581da177e4SLinus Torvalds } 28591da177e4SLinus Torvalds 28601da177e4SLinus Torvalds static unsigned 28611da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 28621da177e4SLinus Torvalds { 28631da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 28641da177e4SLinus Torvalds int remaining; 286555c52718SAlan Stern int port1; 28661da177e4SLinus Torvalds 286755c52718SAlan Stern if (!hub->limited_power) 28681da177e4SLinus Torvalds return 0; 28691da177e4SLinus Torvalds 287055c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 287155c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 287255c52718SAlan Stern struct usb_device *udev = hdev->children[port1 - 1]; 287355c52718SAlan Stern int delta; 28741da177e4SLinus Torvalds 28751da177e4SLinus Torvalds if (!udev) 28761da177e4SLinus Torvalds continue; 28771da177e4SLinus Torvalds 287855c52718SAlan Stern /* Unconfigured devices may not use more than 100mA, 287955c52718SAlan Stern * or 8mA for OTG ports */ 28801da177e4SLinus Torvalds if (udev->actconfig) 288155c52718SAlan Stern delta = udev->actconfig->desc.bMaxPower * 2; 288255c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 288355c52718SAlan Stern delta = 100; 28841da177e4SLinus Torvalds else 288555c52718SAlan Stern delta = 8; 288655c52718SAlan Stern if (delta > hub->mA_per_port) 2887b9cef6c3SWu Fengguang dev_warn(&udev->dev, 2888b9cef6c3SWu Fengguang "%dmA is over %umA budget for port %d!\n", 288955c52718SAlan Stern delta, hub->mA_per_port, port1); 28901da177e4SLinus Torvalds remaining -= delta; 28911da177e4SLinus Torvalds } 28921da177e4SLinus Torvalds if (remaining < 0) { 289355c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 289455c52718SAlan Stern - remaining); 28951da177e4SLinus Torvalds remaining = 0; 28961da177e4SLinus Torvalds } 28971da177e4SLinus Torvalds return remaining; 28981da177e4SLinus Torvalds } 28991da177e4SLinus Torvalds 29001da177e4SLinus Torvalds /* Handle physical or logical connection change events. 29011da177e4SLinus Torvalds * This routine is called when: 29021da177e4SLinus Torvalds * a port connection-change occurs; 29031da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 2904742120c6SMing Lei * usb_reset_and_verify_device() encounters changed descriptors (as from 29051da177e4SLinus Torvalds * a firmware download) 29061da177e4SLinus Torvalds * caller already locked the hub 29071da177e4SLinus Torvalds */ 29081da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 29091da177e4SLinus Torvalds u16 portstatus, u16 portchange) 29101da177e4SLinus Torvalds { 29111da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 29121da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 291390da096eSBalaji Rao struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 291424618b0cSAlan Stern unsigned wHubCharacteristics = 291524618b0cSAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 29168808f00cSAlan Stern struct usb_device *udev; 29171da177e4SLinus Torvalds int status, i; 29181da177e4SLinus Torvalds 29191da177e4SLinus Torvalds dev_dbg (hub_dev, 29201da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 29211da177e4SLinus Torvalds port1, portstatus, portchange, portspeed (portstatus)); 29221da177e4SLinus Torvalds 29231da177e4SLinus Torvalds if (hub->has_indicators) { 29241da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 29251da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 29261da177e4SLinus Torvalds } 29271da177e4SLinus Torvalds 29281da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 29291da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 29301da177e4SLinus Torvalds if (hdev->bus->is_b_host) 293124618b0cSAlan Stern portchange &= ~(USB_PORT_STAT_C_CONNECTION | 293224618b0cSAlan Stern USB_PORT_STAT_C_ENABLE); 29331da177e4SLinus Torvalds #endif 29341da177e4SLinus Torvalds 29358808f00cSAlan Stern /* Try to resuscitate an existing device */ 29368808f00cSAlan Stern udev = hdev->children[port1-1]; 29378808f00cSAlan Stern if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && 29388808f00cSAlan Stern udev->state != USB_STATE_NOTATTACHED) { 29398808f00cSAlan Stern usb_lock_device(udev); 29408808f00cSAlan Stern if (portstatus & USB_PORT_STAT_ENABLE) { 29418808f00cSAlan Stern status = 0; /* Nothing to do */ 29428808f00cSAlan Stern 29438808f00cSAlan Stern #ifdef CONFIG_USB_SUSPEND 29445257d97aSAlan Stern } else if (udev->state == USB_STATE_SUSPENDED && 29455257d97aSAlan Stern udev->persist_enabled) { 29468808f00cSAlan Stern /* For a suspended device, treat this as a 29478808f00cSAlan Stern * remote wakeup event. 29488808f00cSAlan Stern */ 29498808f00cSAlan Stern status = remote_wakeup(udev); 29508808f00cSAlan Stern #endif 29518808f00cSAlan Stern 29528808f00cSAlan Stern } else { 29535257d97aSAlan Stern status = -ENODEV; /* Don't resuscitate */ 29548808f00cSAlan Stern } 29558808f00cSAlan Stern usb_unlock_device(udev); 29568808f00cSAlan Stern 29578808f00cSAlan Stern if (status == 0) { 29588808f00cSAlan Stern clear_bit(port1, hub->change_bits); 29598808f00cSAlan Stern return; 29608808f00cSAlan Stern } 29618808f00cSAlan Stern } 29628808f00cSAlan Stern 296324618b0cSAlan Stern /* Disconnect any existing devices under this port */ 29648808f00cSAlan Stern if (udev) 296524618b0cSAlan Stern usb_disconnect(&hdev->children[port1-1]); 296624618b0cSAlan Stern clear_bit(port1, hub->change_bits); 296724618b0cSAlan Stern 29685257d97aSAlan Stern if (portchange & (USB_PORT_STAT_C_CONNECTION | 29695257d97aSAlan Stern USB_PORT_STAT_C_ENABLE)) { 29705257d97aSAlan Stern status = hub_port_debounce(hub, port1); 29715257d97aSAlan Stern if (status < 0) { 29725257d97aSAlan Stern if (printk_ratelimit()) 29735257d97aSAlan Stern dev_err(hub_dev, "connect-debounce failed, " 29745257d97aSAlan Stern "port %d disabled\n", port1); 29755257d97aSAlan Stern portstatus &= ~USB_PORT_STAT_CONNECTION; 29765257d97aSAlan Stern } else { 29775257d97aSAlan Stern portstatus = status; 29785257d97aSAlan Stern } 29795257d97aSAlan Stern } 29805257d97aSAlan Stern 298124618b0cSAlan Stern /* Return now if debouncing failed or nothing is connected */ 29821da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) { 29831da177e4SLinus Torvalds 29841da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 298574ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 29861da177e4SLinus Torvalds && !(portstatus & (1 << USB_PORT_FEAT_POWER))) 29871da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 29881da177e4SLinus Torvalds 29891da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 29901da177e4SLinus Torvalds goto done; 29911da177e4SLinus Torvalds return; 29921da177e4SLinus Torvalds } 29931da177e4SLinus Torvalds 29941da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 29951da177e4SLinus Torvalds 29961da177e4SLinus Torvalds /* reallocate for each attempt, since references 29971da177e4SLinus Torvalds * to the previous one can escape in various ways 29981da177e4SLinus Torvalds */ 29991da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 30001da177e4SLinus Torvalds if (!udev) { 30011da177e4SLinus Torvalds dev_err (hub_dev, 30021da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 30031da177e4SLinus Torvalds port1); 30041da177e4SLinus Torvalds goto done; 30051da177e4SLinus Torvalds } 30061da177e4SLinus Torvalds 30071da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 300855c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 3009b6956ffaSAlan Stern udev->level = hdev->level + 1; 30108af548dcSInaky Perez-Gonzalez udev->wusb = hub_is_wusb(hub); 30111da177e4SLinus Torvalds 3012e7b77172SSarah Sharp /* 3013e7b77172SSarah Sharp * USB 3.0 devices are reset automatically before the connect 3014e7b77172SSarah Sharp * port status change appears, and the root hub port status 3015e7b77172SSarah Sharp * shows the correct speed. We also get port change 3016e7b77172SSarah Sharp * notifications for USB 3.0 devices from the USB 3.0 portion of 3017e7b77172SSarah Sharp * an external USB 3.0 hub, but this isn't handled correctly yet 3018e7b77172SSarah Sharp * FIXME. 3019e7b77172SSarah Sharp */ 3020e7b77172SSarah Sharp 3021e7b77172SSarah Sharp if (!(hcd->driver->flags & HCD_USB3)) 3022e7b77172SSarah Sharp udev->speed = USB_SPEED_UNKNOWN; 3023e7b77172SSarah Sharp else if ((hdev->parent == NULL) && 3024e7b77172SSarah Sharp (portstatus & (1 << USB_PORT_FEAT_SUPERSPEED))) 3025e7b77172SSarah Sharp udev->speed = USB_SPEED_SUPER; 3026e7b77172SSarah Sharp else 3027e7b77172SSarah Sharp udev->speed = USB_SPEED_UNKNOWN; 3028e7b77172SSarah Sharp 3029c6515272SSarah Sharp /* 3030c6515272SSarah Sharp * xHCI needs to issue an address device command later 3031c6515272SSarah Sharp * in the hub_port_init sequence for SS/HS/FS/LS devices. 3032c6515272SSarah Sharp */ 3033c6515272SSarah Sharp if (!(hcd->driver->flags & HCD_USB3)) { 3034c6515272SSarah Sharp /* set the address */ 3035c6515272SSarah Sharp choose_address(udev); 3036c6515272SSarah Sharp if (udev->devnum <= 0) { 3037c6515272SSarah Sharp status = -ENOTCONN; /* Don't retry */ 3038c6515272SSarah Sharp goto loop; 3039c6515272SSarah Sharp } 3040c6515272SSarah Sharp } 3041c6515272SSarah Sharp 3042e7b77172SSarah Sharp /* reset (non-USB 3.0 devices) and get descriptor */ 30431da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 30441da177e4SLinus Torvalds if (status < 0) 30451da177e4SLinus Torvalds goto loop; 30461da177e4SLinus Torvalds 30471da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 30481da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 30491da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 30501da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 30511da177e4SLinus Torvalds * on the parent. 30521da177e4SLinus Torvalds */ 30531da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 305455c52718SAlan Stern && udev->bus_mA <= 100) { 30551da177e4SLinus Torvalds u16 devstat; 30561da177e4SLinus Torvalds 30571da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 30581da177e4SLinus Torvalds &devstat); 305955c52718SAlan Stern if (status < 2) { 30601da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 30611da177e4SLinus Torvalds goto loop_disable; 30621da177e4SLinus Torvalds } 306355c52718SAlan Stern le16_to_cpus(&devstat); 30641da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 30651da177e4SLinus Torvalds dev_err(&udev->dev, 30661da177e4SLinus Torvalds "can't connect bus-powered hub " 30671da177e4SLinus Torvalds "to this port\n"); 30681da177e4SLinus Torvalds if (hub->has_indicators) { 30691da177e4SLinus Torvalds hub->indicator[port1-1] = 30701da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 3071c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 30721da177e4SLinus Torvalds } 30731da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 30741da177e4SLinus Torvalds goto loop_disable; 30751da177e4SLinus Torvalds } 30761da177e4SLinus Torvalds } 30771da177e4SLinus Torvalds 30781da177e4SLinus Torvalds /* check for devices running slower than they could */ 30791da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 30801da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 30811da177e4SLinus Torvalds && highspeed_hubs != 0) 30821da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 30831da177e4SLinus Torvalds 30841da177e4SLinus Torvalds /* Store the parent's children[] pointer. At this point 30851da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 30861da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 30871da177e4SLinus Torvalds */ 30881da177e4SLinus Torvalds status = 0; 30891da177e4SLinus Torvalds 30901da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 30911da177e4SLinus Torvalds * been disconnected; we would race with the 30921da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 30931da177e4SLinus Torvalds */ 30941da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 30951da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 30961da177e4SLinus Torvalds status = -ENOTCONN; 30971da177e4SLinus Torvalds else 30981da177e4SLinus Torvalds hdev->children[port1-1] = udev; 30991da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 31001da177e4SLinus Torvalds 31011da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 31021da177e4SLinus Torvalds if (!status) { 31031da177e4SLinus Torvalds status = usb_new_device(udev); 31041da177e4SLinus Torvalds if (status) { 31051da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 31061da177e4SLinus Torvalds hdev->children[port1-1] = NULL; 31071da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 31081da177e4SLinus Torvalds } 31091da177e4SLinus Torvalds } 31101da177e4SLinus Torvalds 31111da177e4SLinus Torvalds if (status) 31121da177e4SLinus Torvalds goto loop_disable; 31131da177e4SLinus Torvalds 31141da177e4SLinus Torvalds status = hub_power_remaining(hub); 31151da177e4SLinus Torvalds if (status) 311655c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 31171da177e4SLinus Torvalds 31181da177e4SLinus Torvalds return; 31191da177e4SLinus Torvalds 31201da177e4SLinus Torvalds loop_disable: 31211da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 31221da177e4SLinus Torvalds loop: 3123fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 31241da177e4SLinus Torvalds release_address(udev); 31251da177e4SLinus Torvalds usb_put_dev(udev); 3126ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 31271da177e4SLinus Torvalds break; 31281da177e4SLinus Torvalds } 31293a31155cSAlan Stern if (hub->hdev->parent || 31303a31155cSAlan Stern !hcd->driver->port_handed_over || 31313a31155cSAlan Stern !(hcd->driver->port_handed_over)(hcd, port1)) 31323a31155cSAlan Stern dev_err(hub_dev, "unable to enumerate USB device on port %d\n", 31333a31155cSAlan Stern port1); 31341da177e4SLinus Torvalds 31351da177e4SLinus Torvalds done: 31361da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 313790da096eSBalaji Rao if (hcd->driver->relinquish_port && !hub->hdev->parent) 313890da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 31391da177e4SLinus Torvalds } 31401da177e4SLinus Torvalds 31411da177e4SLinus Torvalds static void hub_events(void) 31421da177e4SLinus Torvalds { 31431da177e4SLinus Torvalds struct list_head *tmp; 31441da177e4SLinus Torvalds struct usb_device *hdev; 31451da177e4SLinus Torvalds struct usb_interface *intf; 31461da177e4SLinus Torvalds struct usb_hub *hub; 31471da177e4SLinus Torvalds struct device *hub_dev; 31481da177e4SLinus Torvalds u16 hubstatus; 31491da177e4SLinus Torvalds u16 hubchange; 31501da177e4SLinus Torvalds u16 portstatus; 31511da177e4SLinus Torvalds u16 portchange; 31521da177e4SLinus Torvalds int i, ret; 31531da177e4SLinus Torvalds int connect_change; 31541da177e4SLinus Torvalds 31551da177e4SLinus Torvalds /* 31561da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 31571da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 31581da177e4SLinus Torvalds * safe since we delete the hub from the event list. 31591da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 31601da177e4SLinus Torvalds */ 31611da177e4SLinus Torvalds while (1) { 31621da177e4SLinus Torvalds 31631da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 31641da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 31651da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 31661da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 31671da177e4SLinus Torvalds break; 31681da177e4SLinus Torvalds } 31691da177e4SLinus Torvalds 31701da177e4SLinus Torvalds tmp = hub_event_list.next; 31711da177e4SLinus Torvalds list_del_init(tmp); 31721da177e4SLinus Torvalds 31731da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 3174e8054854SAlan Stern kref_get(&hub->kref); 3175e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 31761da177e4SLinus Torvalds 3177e8054854SAlan Stern hdev = hub->hdev; 3178e8054854SAlan Stern hub_dev = hub->intfdev; 3179e8054854SAlan Stern intf = to_usb_interface(hub_dev); 318040f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 31811da177e4SLinus Torvalds hdev->state, hub->descriptor 31821da177e4SLinus Torvalds ? hub->descriptor->bNbrPorts 31831da177e4SLinus Torvalds : 0, 31841da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 31851da177e4SLinus Torvalds (u16) hub->change_bits[0], 318640f122f3SAlan Stern (u16) hub->event_bits[0]); 31871da177e4SLinus Torvalds 31881da177e4SLinus Torvalds /* Lock the device, then check to see if we were 31891da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 319006b84e8aSAlan Stern usb_lock_device(hdev); 3191e8054854SAlan Stern if (unlikely(hub->disconnected)) 31921da177e4SLinus Torvalds goto loop; 31931da177e4SLinus Torvalds 31941da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 31951da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 31967de18d8bSAlan Stern hub->error = -ENODEV; 31974330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 31981da177e4SLinus Torvalds goto loop; 31991da177e4SLinus Torvalds } 32001da177e4SLinus Torvalds 320140f122f3SAlan Stern /* Autoresume */ 320240f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 320340f122f3SAlan Stern if (ret) { 320440f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 32051da177e4SLinus Torvalds goto loop; 320640f122f3SAlan Stern } 320740f122f3SAlan Stern 320840f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 320940f122f3SAlan Stern if (hub->quiescing) 321040f122f3SAlan Stern goto loop_autopm; 32111da177e4SLinus Torvalds 32121da177e4SLinus Torvalds if (hub->error) { 32131da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 32141da177e4SLinus Torvalds hub->error); 32151da177e4SLinus Torvalds 3216742120c6SMing Lei ret = usb_reset_device(hdev); 32171da177e4SLinus Torvalds if (ret) { 32181da177e4SLinus Torvalds dev_dbg (hub_dev, 32191da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 322040f122f3SAlan Stern goto loop_autopm; 32211da177e4SLinus Torvalds } 32221da177e4SLinus Torvalds 32231da177e4SLinus Torvalds hub->nerrors = 0; 32241da177e4SLinus Torvalds hub->error = 0; 32251da177e4SLinus Torvalds } 32261da177e4SLinus Torvalds 32271da177e4SLinus Torvalds /* deal with port status changes */ 32281da177e4SLinus Torvalds for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { 32291da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 32301da177e4SLinus Torvalds continue; 32311da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 32321da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 32336ee0b270SAlan Stern !connect_change) 32341da177e4SLinus Torvalds continue; 32351da177e4SLinus Torvalds 32361da177e4SLinus Torvalds ret = hub_port_status(hub, i, 32371da177e4SLinus Torvalds &portstatus, &portchange); 32381da177e4SLinus Torvalds if (ret < 0) 32391da177e4SLinus Torvalds continue; 32401da177e4SLinus Torvalds 32411da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 32421da177e4SLinus Torvalds clear_port_feature(hdev, i, 32431da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 32441da177e4SLinus Torvalds connect_change = 1; 32451da177e4SLinus Torvalds } 32461da177e4SLinus Torvalds 32471da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 32481da177e4SLinus Torvalds if (!connect_change) 32491da177e4SLinus Torvalds dev_dbg (hub_dev, 32501da177e4SLinus Torvalds "port %d enable change, " 32511da177e4SLinus Torvalds "status %08x\n", 32521da177e4SLinus Torvalds i, portstatus); 32531da177e4SLinus Torvalds clear_port_feature(hdev, i, 32541da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 32551da177e4SLinus Torvalds 32561da177e4SLinus Torvalds /* 32571da177e4SLinus Torvalds * EM interference sometimes causes badly 32581da177e4SLinus Torvalds * shielded USB devices to be shutdown by 32591da177e4SLinus Torvalds * the hub, this hack enables them again. 32601da177e4SLinus Torvalds * Works at least with mouse driver. 32611da177e4SLinus Torvalds */ 32621da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 32631da177e4SLinus Torvalds && !connect_change 32641da177e4SLinus Torvalds && hdev->children[i-1]) { 32651da177e4SLinus Torvalds dev_err (hub_dev, 32661da177e4SLinus Torvalds "port %i " 32671da177e4SLinus Torvalds "disabled by hub (EMI?), " 32681da177e4SLinus Torvalds "re-enabling...\n", 32691da177e4SLinus Torvalds i); 32701da177e4SLinus Torvalds connect_change = 1; 32711da177e4SLinus Torvalds } 32721da177e4SLinus Torvalds } 32731da177e4SLinus Torvalds 32741da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_SUSPEND) { 32758808f00cSAlan Stern struct usb_device *udev; 32768808f00cSAlan Stern 32771da177e4SLinus Torvalds clear_port_feature(hdev, i, 32781da177e4SLinus Torvalds USB_PORT_FEAT_C_SUSPEND); 32798808f00cSAlan Stern udev = hdev->children[i-1]; 32808808f00cSAlan Stern if (udev) { 32818808f00cSAlan Stern usb_lock_device(udev); 32821da177e4SLinus Torvalds ret = remote_wakeup(hdev-> 32831da177e4SLinus Torvalds children[i-1]); 32848808f00cSAlan Stern usb_unlock_device(udev); 32851da177e4SLinus Torvalds if (ret < 0) 32861da177e4SLinus Torvalds connect_change = 1; 32871da177e4SLinus Torvalds } else { 32881da177e4SLinus Torvalds ret = -ENODEV; 32891da177e4SLinus Torvalds hub_port_disable(hub, i, 1); 32901da177e4SLinus Torvalds } 32911da177e4SLinus Torvalds dev_dbg (hub_dev, 32921da177e4SLinus Torvalds "resume on port %d, status %d\n", 32931da177e4SLinus Torvalds i, ret); 32941da177e4SLinus Torvalds } 32951da177e4SLinus Torvalds 32961da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 32971da177e4SLinus Torvalds dev_err (hub_dev, 32981da177e4SLinus Torvalds "over-current change on port %d\n", 32991da177e4SLinus Torvalds i); 33001da177e4SLinus Torvalds clear_port_feature(hdev, i, 33011da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 33028520f380SAlan Stern hub_power_on(hub, true); 33031da177e4SLinus Torvalds } 33041da177e4SLinus Torvalds 33051da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 33061da177e4SLinus Torvalds dev_dbg (hub_dev, 33071da177e4SLinus Torvalds "reset change on port %d\n", 33081da177e4SLinus Torvalds i); 33091da177e4SLinus Torvalds clear_port_feature(hdev, i, 33101da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 33111da177e4SLinus Torvalds } 33121da177e4SLinus Torvalds 33131da177e4SLinus Torvalds if (connect_change) 33141da177e4SLinus Torvalds hub_port_connect_change(hub, i, 33151da177e4SLinus Torvalds portstatus, portchange); 33161da177e4SLinus Torvalds } /* end for i */ 33171da177e4SLinus Torvalds 33181da177e4SLinus Torvalds /* deal with hub status changes */ 33191da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 33201da177e4SLinus Torvalds ; /* do nothing */ 33211da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 33221da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 33231da177e4SLinus Torvalds else { 33241da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 33251da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 33261da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 332755c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 332855c52718SAlan Stern /* FIXME: Is this always true? */ 332955c52718SAlan Stern hub->limited_power = 1; 3330403fae78Sjidong xiao else 3331403fae78Sjidong xiao hub->limited_power = 0; 33321da177e4SLinus Torvalds } 33331da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 33341da177e4SLinus Torvalds dev_dbg (hub_dev, "overcurrent change\n"); 33351da177e4SLinus Torvalds msleep(500); /* Cool down */ 33361da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 33378520f380SAlan Stern hub_power_on(hub, true); 33381da177e4SLinus Torvalds } 33391da177e4SLinus Torvalds } 33401da177e4SLinus Torvalds 334140f122f3SAlan Stern loop_autopm: 334240f122f3SAlan Stern /* Allow autosuspend if we're not going to run again */ 334340f122f3SAlan Stern if (list_empty(&hub->event_list)) 334440f122f3SAlan Stern usb_autopm_enable(intf); 33451da177e4SLinus Torvalds loop: 33461da177e4SLinus Torvalds usb_unlock_device(hdev); 3347e8054854SAlan Stern kref_put(&hub->kref, hub_release); 33481da177e4SLinus Torvalds 33491da177e4SLinus Torvalds } /* end while (1) */ 33501da177e4SLinus Torvalds } 33511da177e4SLinus Torvalds 33521da177e4SLinus Torvalds static int hub_thread(void *__unused) 33531da177e4SLinus Torvalds { 33543bb1af52SAlan Stern /* khubd needs to be freezable to avoid intefering with USB-PERSIST 33553bb1af52SAlan Stern * port handover. Otherwise it might see that a full-speed device 33563bb1af52SAlan Stern * was gone before the EHCI controller had handed its port over to 33573bb1af52SAlan Stern * the companion full-speed controller. 33583bb1af52SAlan Stern */ 335983144186SRafael J. Wysocki set_freezable(); 33603bb1af52SAlan Stern 33611da177e4SLinus Torvalds do { 33621da177e4SLinus Torvalds hub_events(); 3363e42837bcSRafael J. Wysocki wait_event_freezable(khubd_wait, 33649c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 33659c8d6178Sakpm@osdl.org kthread_should_stop()); 33669c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 33671da177e4SLinus Torvalds 33681da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 33699c8d6178Sakpm@osdl.org return 0; 33701da177e4SLinus Torvalds } 33711da177e4SLinus Torvalds 33721da177e4SLinus Torvalds static struct usb_device_id hub_id_table [] = { 33731da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 33741da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 33751da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 33761da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 33771da177e4SLinus Torvalds { } /* Terminating entry */ 33781da177e4SLinus Torvalds }; 33791da177e4SLinus Torvalds 33801da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 33811da177e4SLinus Torvalds 33821da177e4SLinus Torvalds static struct usb_driver hub_driver = { 33831da177e4SLinus Torvalds .name = "hub", 33841da177e4SLinus Torvalds .probe = hub_probe, 33851da177e4SLinus Torvalds .disconnect = hub_disconnect, 33861da177e4SLinus Torvalds .suspend = hub_suspend, 33871da177e4SLinus Torvalds .resume = hub_resume, 3388f07600cfSAlan Stern .reset_resume = hub_reset_resume, 33897de18d8bSAlan Stern .pre_reset = hub_pre_reset, 33907de18d8bSAlan Stern .post_reset = hub_post_reset, 33911da177e4SLinus Torvalds .ioctl = hub_ioctl, 33921da177e4SLinus Torvalds .id_table = hub_id_table, 339340f122f3SAlan Stern .supports_autosuspend = 1, 33941da177e4SLinus Torvalds }; 33951da177e4SLinus Torvalds 33961da177e4SLinus Torvalds int usb_hub_init(void) 33971da177e4SLinus Torvalds { 33981da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 33991da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 34001da177e4SLinus Torvalds usbcore_name); 34011da177e4SLinus Torvalds return -1; 34021da177e4SLinus Torvalds } 34031da177e4SLinus Torvalds 34049c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 34059c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 34061da177e4SLinus Torvalds return 0; 34071da177e4SLinus Torvalds 34081da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 34091da177e4SLinus Torvalds usb_deregister(&hub_driver); 34101da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 34111da177e4SLinus Torvalds 34121da177e4SLinus Torvalds return -1; 34131da177e4SLinus Torvalds } 34141da177e4SLinus Torvalds 34151da177e4SLinus Torvalds void usb_hub_cleanup(void) 34161da177e4SLinus Torvalds { 34179c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 34181da177e4SLinus Torvalds 34191da177e4SLinus Torvalds /* 34201da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 34211da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 34221da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 34231da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 34241da177e4SLinus Torvalds * individual hub resources. -greg 34251da177e4SLinus Torvalds */ 34261da177e4SLinus Torvalds usb_deregister(&hub_driver); 34271da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 34281da177e4SLinus Torvalds 3429eb764c4bSAlan Stern static int descriptors_changed(struct usb_device *udev, 3430eb764c4bSAlan Stern struct usb_device_descriptor *old_device_descriptor) 34311da177e4SLinus Torvalds { 3432eb764c4bSAlan Stern int changed = 0; 34331da177e4SLinus Torvalds unsigned index; 3434eb764c4bSAlan Stern unsigned serial_len = 0; 3435eb764c4bSAlan Stern unsigned len; 3436eb764c4bSAlan Stern unsigned old_length; 3437eb764c4bSAlan Stern int length; 3438eb764c4bSAlan Stern char *buf; 34391da177e4SLinus Torvalds 3440eb764c4bSAlan Stern if (memcmp(&udev->descriptor, old_device_descriptor, 3441eb764c4bSAlan Stern sizeof(*old_device_descriptor)) != 0) 3442eb764c4bSAlan Stern return 1; 3443eb764c4bSAlan Stern 3444eb764c4bSAlan Stern /* Since the idVendor, idProduct, and bcdDevice values in the 3445eb764c4bSAlan Stern * device descriptor haven't changed, we will assume the 3446eb764c4bSAlan Stern * Manufacturer and Product strings haven't changed either. 3447eb764c4bSAlan Stern * But the SerialNumber string could be different (e.g., a 3448eb764c4bSAlan Stern * different flash card of the same brand). 3449eb764c4bSAlan Stern */ 3450eb764c4bSAlan Stern if (udev->serial) 3451eb764c4bSAlan Stern serial_len = strlen(udev->serial) + 1; 3452eb764c4bSAlan Stern 3453eb764c4bSAlan Stern len = serial_len; 34541da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 3455eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 3456eb764c4bSAlan Stern len = max(len, old_length); 34571da177e4SLinus Torvalds } 3458eb764c4bSAlan Stern 34590cc1a51fSOliver Neukum buf = kmalloc(len, GFP_NOIO); 34601da177e4SLinus Torvalds if (buf == NULL) { 34611da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 34621da177e4SLinus Torvalds /* assume the worst */ 34631da177e4SLinus Torvalds return 1; 34641da177e4SLinus Torvalds } 34651da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 3466eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 34671da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 34681da177e4SLinus Torvalds old_length); 3469eb764c4bSAlan Stern if (length != old_length) { 34701da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 34711da177e4SLinus Torvalds index, length); 3472eb764c4bSAlan Stern changed = 1; 34731da177e4SLinus Torvalds break; 34741da177e4SLinus Torvalds } 34751da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 34761da177e4SLinus Torvalds != 0) { 34771da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 3478eb764c4bSAlan Stern index, 3479eb764c4bSAlan Stern ((struct usb_config_descriptor *) buf)-> 3480eb764c4bSAlan Stern bConfigurationValue); 3481eb764c4bSAlan Stern changed = 1; 34821da177e4SLinus Torvalds break; 34831da177e4SLinus Torvalds } 34841da177e4SLinus Torvalds } 3485eb764c4bSAlan Stern 3486eb764c4bSAlan Stern if (!changed && serial_len) { 3487eb764c4bSAlan Stern length = usb_string(udev, udev->descriptor.iSerialNumber, 3488eb764c4bSAlan Stern buf, serial_len); 3489eb764c4bSAlan Stern if (length + 1 != serial_len) { 3490eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string error %d\n", 3491eb764c4bSAlan Stern length); 3492eb764c4bSAlan Stern changed = 1; 3493eb764c4bSAlan Stern } else if (memcmp(buf, udev->serial, length) != 0) { 3494eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string changed\n"); 3495eb764c4bSAlan Stern changed = 1; 3496eb764c4bSAlan Stern } 3497eb764c4bSAlan Stern } 3498eb764c4bSAlan Stern 34991da177e4SLinus Torvalds kfree(buf); 3500eb764c4bSAlan Stern return changed; 35011da177e4SLinus Torvalds } 35021da177e4SLinus Torvalds 35031da177e4SLinus Torvalds /** 3504742120c6SMing Lei * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device 35051da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 35061da177e4SLinus Torvalds * 350779efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 350879efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 3509742120c6SMing Lei * Use usb_reset_device() instead. 35101da177e4SLinus Torvalds * 35111da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 35121da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 35131da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 35141da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 35151da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 35161da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 35171da177e4SLinus Torvalds * re-enumerated and probed all over again. 35181da177e4SLinus Torvalds * 35191da177e4SLinus Torvalds * Returns 0 if the reset succeeded, -ENODEV if the device has been 35201da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 35211da177e4SLinus Torvalds * if the reset wasn't even attempted. 35221da177e4SLinus Torvalds * 35231da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 35241da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 35251da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 35261da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 35276bc6cff5SAlan Stern * 35286bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 35296bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 35306bc6cff5SAlan Stern * holding the device lock because these tasks should always call 35316bc6cff5SAlan Stern * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. 35321da177e4SLinus Torvalds */ 3533742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev) 35341da177e4SLinus Torvalds { 35351da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 35361da177e4SLinus Torvalds struct usb_hub *parent_hub; 35371da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 353812c3da34SAlan Stern int i, ret = 0; 353912c3da34SAlan Stern int port1 = udev->portnum; 35401da177e4SLinus Torvalds 35411da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 35421da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 35431da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 35441da177e4SLinus Torvalds udev->state); 35451da177e4SLinus Torvalds return -EINVAL; 35461da177e4SLinus Torvalds } 35471da177e4SLinus Torvalds 35481da177e4SLinus Torvalds if (!parent_hdev) { 35491da177e4SLinus Torvalds /* this requires hcd-specific logic; see OHCI hc_restart() */ 3550441b62c1SHarvey Harrison dev_dbg(&udev->dev, "%s for root hub!\n", __func__); 35511da177e4SLinus Torvalds return -EISDIR; 35521da177e4SLinus Torvalds } 35531da177e4SLinus Torvalds parent_hub = hdev_to_hub(parent_hdev); 35541da177e4SLinus Torvalds 35551da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 35561da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 35571da177e4SLinus Torvalds 35581da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 35591da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 3560fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 35611da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 3562dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 35631da177e4SLinus Torvalds break; 35641da177e4SLinus Torvalds } 35651da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 3566d5cbad4bSAlan Stern 35671da177e4SLinus Torvalds if (ret < 0) 35681da177e4SLinus Torvalds goto re_enumerate; 35691da177e4SLinus Torvalds 35701da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 3571eb764c4bSAlan Stern if (descriptors_changed(udev, &descriptor)) { 35721da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 35731da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 35741da177e4SLinus Torvalds goto re_enumerate; 35751da177e4SLinus Torvalds } 35761da177e4SLinus Torvalds 35774fe0387aSAlan Stern /* Restore the device's previous configuration */ 35781da177e4SLinus Torvalds if (!udev->actconfig) 35791da177e4SLinus Torvalds goto done; 35801da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 35811da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 35821da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 35831da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 35841da177e4SLinus Torvalds if (ret < 0) { 35851da177e4SLinus Torvalds dev_err(&udev->dev, 35861da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 35871da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 35881da177e4SLinus Torvalds goto re_enumerate; 35891da177e4SLinus Torvalds } 35901da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 35911da177e4SLinus Torvalds 35924fe0387aSAlan Stern /* Put interfaces back into the same altsettings as before. 35934fe0387aSAlan Stern * Don't bother to send the Set-Interface request for interfaces 35944fe0387aSAlan Stern * that were already in altsetting 0; besides being unnecessary, 35954fe0387aSAlan Stern * many devices can't handle it. Instead just reset the host-side 35964fe0387aSAlan Stern * endpoint state. 35974fe0387aSAlan Stern */ 35981da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 35991da177e4SLinus Torvalds struct usb_interface *intf = udev->actconfig->interface[i]; 36001da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 36011da177e4SLinus Torvalds 36021da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 36034fe0387aSAlan Stern if (desc->bAlternateSetting == 0) { 36044fe0387aSAlan Stern usb_disable_interface(udev, intf, true); 36054fe0387aSAlan Stern usb_enable_interface(udev, intf, true); 36064fe0387aSAlan Stern ret = 0; 36074fe0387aSAlan Stern } else { 36081da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 36091da177e4SLinus Torvalds desc->bAlternateSetting); 36104fe0387aSAlan Stern } 36111da177e4SLinus Torvalds if (ret < 0) { 36121da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 36131da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 36141da177e4SLinus Torvalds desc->bInterfaceNumber, 36151da177e4SLinus Torvalds desc->bAlternateSetting, 36161da177e4SLinus Torvalds ret); 36171da177e4SLinus Torvalds goto re_enumerate; 36181da177e4SLinus Torvalds } 36191da177e4SLinus Torvalds } 36201da177e4SLinus Torvalds 36211da177e4SLinus Torvalds done: 36221da177e4SLinus Torvalds return 0; 36231da177e4SLinus Torvalds 36241da177e4SLinus Torvalds re_enumerate: 36251da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 36261da177e4SLinus Torvalds return -ENODEV; 36271da177e4SLinus Torvalds } 362879efa097SAlan Stern 362979efa097SAlan Stern /** 3630742120c6SMing Lei * usb_reset_device - warn interface drivers and perform a USB port reset 363179efa097SAlan Stern * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 363279efa097SAlan Stern * 363379efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 363479efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 363579efa097SAlan Stern * the reset is over (using their post_reset method). 363679efa097SAlan Stern * 3637742120c6SMing Lei * Return value is the same as for usb_reset_and_verify_device(). 363879efa097SAlan Stern * 363979efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 364079efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 364179efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 364279efa097SAlan Stern * the device using usb_lock_device_for_reset(). 364378d9a487SAlan Stern * 364478d9a487SAlan Stern * If an interface is currently being probed or disconnected, we assume 364578d9a487SAlan Stern * its driver knows how to handle resets. For all other interfaces, 364678d9a487SAlan Stern * if the driver doesn't have pre_reset and post_reset methods then 364778d9a487SAlan Stern * we attempt to unbind it and rebind afterward. 364879efa097SAlan Stern */ 3649742120c6SMing Lei int usb_reset_device(struct usb_device *udev) 365079efa097SAlan Stern { 365179efa097SAlan Stern int ret; 3652852c4b43SAlan Stern int i; 365379efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 365479efa097SAlan Stern 365579efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 365679efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 365779efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 365879efa097SAlan Stern udev->state); 365979efa097SAlan Stern return -EINVAL; 366079efa097SAlan Stern } 366179efa097SAlan Stern 3662645daaabSAlan Stern /* Prevent autosuspend during the reset */ 366394fcda1fSAlan Stern usb_autoresume_device(udev); 3664645daaabSAlan Stern 366579efa097SAlan Stern if (config) { 3666852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 3667852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 366879efa097SAlan Stern struct usb_driver *drv; 366978d9a487SAlan Stern int unbind = 0; 367079efa097SAlan Stern 3671852c4b43SAlan Stern if (cintf->dev.driver) { 367279efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 367378d9a487SAlan Stern if (drv->pre_reset && drv->post_reset) 367478d9a487SAlan Stern unbind = (drv->pre_reset)(cintf); 367578d9a487SAlan Stern else if (cintf->condition == 367678d9a487SAlan Stern USB_INTERFACE_BOUND) 367778d9a487SAlan Stern unbind = 1; 367878d9a487SAlan Stern if (unbind) 367978d9a487SAlan Stern usb_forced_unbind_intf(cintf); 368079efa097SAlan Stern } 368179efa097SAlan Stern } 368279efa097SAlan Stern } 368379efa097SAlan Stern 3684742120c6SMing Lei ret = usb_reset_and_verify_device(udev); 368579efa097SAlan Stern 368679efa097SAlan Stern if (config) { 3687852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 3688852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 368979efa097SAlan Stern struct usb_driver *drv; 369078d9a487SAlan Stern int rebind = cintf->needs_binding; 369179efa097SAlan Stern 369278d9a487SAlan Stern if (!rebind && cintf->dev.driver) { 369379efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 369479efa097SAlan Stern if (drv->post_reset) 369578d9a487SAlan Stern rebind = (drv->post_reset)(cintf); 369678d9a487SAlan Stern else if (cintf->condition == 369778d9a487SAlan Stern USB_INTERFACE_BOUND) 369878d9a487SAlan Stern rebind = 1; 369979efa097SAlan Stern } 37006c640945SAlan Stern if (ret == 0 && rebind) 370178d9a487SAlan Stern usb_rebind_intf(cintf); 370279efa097SAlan Stern } 370379efa097SAlan Stern } 370479efa097SAlan Stern 370594fcda1fSAlan Stern usb_autosuspend_device(udev); 370679efa097SAlan Stern return ret; 370779efa097SAlan Stern } 3708742120c6SMing Lei EXPORT_SYMBOL_GPL(usb_reset_device); 3709dc023dceSInaky Perez-Gonzalez 3710dc023dceSInaky Perez-Gonzalez 3711dc023dceSInaky Perez-Gonzalez /** 3712dc023dceSInaky Perez-Gonzalez * usb_queue_reset_device - Reset a USB device from an atomic context 3713dc023dceSInaky Perez-Gonzalez * @iface: USB interface belonging to the device to reset 3714dc023dceSInaky Perez-Gonzalez * 3715dc023dceSInaky Perez-Gonzalez * This function can be used to reset a USB device from an atomic 3716dc023dceSInaky Perez-Gonzalez * context, where usb_reset_device() won't work (as it blocks). 3717dc023dceSInaky Perez-Gonzalez * 3718dc023dceSInaky Perez-Gonzalez * Doing a reset via this method is functionally equivalent to calling 3719dc023dceSInaky Perez-Gonzalez * usb_reset_device(), except for the fact that it is delayed to a 3720dc023dceSInaky Perez-Gonzalez * workqueue. This means that any drivers bound to other interfaces 3721dc023dceSInaky Perez-Gonzalez * might be unbound, as well as users from usbfs in user space. 3722dc023dceSInaky Perez-Gonzalez * 3723dc023dceSInaky Perez-Gonzalez * Corner cases: 3724dc023dceSInaky Perez-Gonzalez * 3725dc023dceSInaky Perez-Gonzalez * - Scheduling two resets at the same time from two different drivers 3726dc023dceSInaky Perez-Gonzalez * attached to two different interfaces of the same device is 3727dc023dceSInaky Perez-Gonzalez * possible; depending on how the driver attached to each interface 3728dc023dceSInaky Perez-Gonzalez * handles ->pre_reset(), the second reset might happen or not. 3729dc023dceSInaky Perez-Gonzalez * 3730dc023dceSInaky Perez-Gonzalez * - If a driver is unbound and it had a pending reset, the reset will 3731dc023dceSInaky Perez-Gonzalez * be cancelled. 3732dc023dceSInaky Perez-Gonzalez * 3733dc023dceSInaky Perez-Gonzalez * - This function can be called during .probe() or .disconnect() 3734dc023dceSInaky Perez-Gonzalez * times. On return from .disconnect(), any pending resets will be 3735dc023dceSInaky Perez-Gonzalez * cancelled. 3736dc023dceSInaky Perez-Gonzalez * 3737dc023dceSInaky Perez-Gonzalez * There is no no need to lock/unlock the @reset_ws as schedule_work() 3738dc023dceSInaky Perez-Gonzalez * does its own. 3739dc023dceSInaky Perez-Gonzalez * 3740dc023dceSInaky Perez-Gonzalez * NOTE: We don't do any reference count tracking because it is not 3741dc023dceSInaky Perez-Gonzalez * needed. The lifecycle of the work_struct is tied to the 3742dc023dceSInaky Perez-Gonzalez * usb_interface. Before destroying the interface we cancel the 3743dc023dceSInaky Perez-Gonzalez * work_struct, so the fact that work_struct is queued and or 3744dc023dceSInaky Perez-Gonzalez * running means the interface (and thus, the device) exist and 3745dc023dceSInaky Perez-Gonzalez * are referenced. 3746dc023dceSInaky Perez-Gonzalez */ 3747dc023dceSInaky Perez-Gonzalez void usb_queue_reset_device(struct usb_interface *iface) 3748dc023dceSInaky Perez-Gonzalez { 3749dc023dceSInaky Perez-Gonzalez schedule_work(&iface->reset_ws); 3750dc023dceSInaky Perez-Gonzalez } 3751dc023dceSInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_queue_reset_device); 3752