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; 811bb5f66bSAlan Stern }; 821bb5f66bSAlan Stern 831bb5f66bSAlan Stern 841da177e4SLinus Torvalds /* Protect struct usb_device->state and ->children members 859ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 861da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 871da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds /* khubd's worklist and its lock */ 901da177e4SLinus Torvalds static DEFINE_SPINLOCK(hub_event_lock); 911da177e4SLinus Torvalds static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds /* Wakes up khubd */ 941da177e4SLinus Torvalds static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); 951da177e4SLinus Torvalds 969c8d6178Sakpm@osdl.org static struct task_struct *khubd_task; 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 991da177e4SLinus Torvalds static int blinkenlights = 0; 1001da177e4SLinus Torvalds module_param (blinkenlights, bool, S_IRUGO); 1011da177e4SLinus Torvalds MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds /* 104fd7c519dSJaroslav Kysela * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about 105fd7c519dSJaroslav Kysela * 10 seconds to send reply for the initial 64-byte descriptor request. 106fd7c519dSJaroslav Kysela */ 107fd7c519dSJaroslav Kysela /* define initial 64-byte descriptor request timeout in milliseconds */ 108fd7c519dSJaroslav Kysela static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; 109fd7c519dSJaroslav Kysela module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); 110b9cef6c3SWu Fengguang MODULE_PARM_DESC(initial_descriptor_timeout, 111b9cef6c3SWu Fengguang "initial 64-byte descriptor request timeout in milliseconds " 112b9cef6c3SWu Fengguang "(default 5000 - 5.0 seconds)"); 113fd7c519dSJaroslav Kysela 114fd7c519dSJaroslav Kysela /* 1151da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 1161da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 1171da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 1181da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 1191da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 1201da177e4SLinus Torvalds * following module parameters. 1211da177e4SLinus Torvalds * 1221da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 1231da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 1241da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 1251da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 1261da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 1271da177e4SLinus Torvalds */ 1281da177e4SLinus Torvalds static int old_scheme_first = 0; 1291da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 1301da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 1311da177e4SLinus Torvalds "start with the old device initialization scheme"); 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds static int use_both_schemes = 1; 1341da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 1351da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 1361da177e4SLinus Torvalds "try the other device initialization scheme if the " 1371da177e4SLinus Torvalds "first one fails"); 1381da177e4SLinus Torvalds 13932fe0198SAlan Stern /* Mutual exclusion for EHCI CF initialization. This interferes with 14032fe0198SAlan Stern * port reset on some companion controllers. 14132fe0198SAlan Stern */ 14232fe0198SAlan Stern DECLARE_RWSEM(ehci_cf_port_reset_rwsem); 14332fe0198SAlan Stern EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); 14432fe0198SAlan Stern 145948fea37SAlan Stern #define HUB_DEBOUNCE_TIMEOUT 1500 146948fea37SAlan Stern #define HUB_DEBOUNCE_STEP 25 147948fea37SAlan Stern #define HUB_DEBOUNCE_STABLE 100 148948fea37SAlan Stern 1491da177e4SLinus Torvalds 150742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev); 151742120c6SMing Lei 1521da177e4SLinus Torvalds static inline char *portspeed(int portstatus) 1531da177e4SLinus Torvalds { 1541da177e4SLinus Torvalds if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) 1551da177e4SLinus Torvalds return "480 Mb/s"; 1561da177e4SLinus Torvalds else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) 1571da177e4SLinus Torvalds return "1.5 Mb/s"; 158d2e9b4d6SSarah Sharp else if (portstatus & (1 << USB_PORT_FEAT_SUPERSPEED)) 159d2e9b4d6SSarah Sharp return "5.0 Gb/s"; 1601da177e4SLinus Torvalds else 1611da177e4SLinus Torvalds return "12 Mb/s"; 1621da177e4SLinus Torvalds } 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 1651da177e4SLinus Torvalds static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev) 1661da177e4SLinus Torvalds { 1671da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1681da177e4SLinus Torvalds } 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 1711da177e4SLinus Torvalds static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) 1721da177e4SLinus Torvalds { 1731da177e4SLinus Torvalds int i, ret; 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 1761da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 1771da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 1781da177e4SLinus Torvalds USB_DT_HUB << 8, 0, data, size, 1791da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 1801da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 1811da177e4SLinus Torvalds return ret; 1821da177e4SLinus Torvalds } 1831da177e4SLinus Torvalds return -EINVAL; 1841da177e4SLinus Torvalds } 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds /* 1871da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 1881da177e4SLinus Torvalds */ 1891da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 1901da177e4SLinus Torvalds { 1911da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1921da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 1931da177e4SLinus Torvalds } 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvalds /* 1961da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 1971da177e4SLinus Torvalds */ 1981da177e4SLinus Torvalds static int clear_port_feature(struct usb_device *hdev, int port1, int feature) 1991da177e4SLinus Torvalds { 2001da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 2011da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 2021da177e4SLinus Torvalds NULL, 0, 1000); 2031da177e4SLinus Torvalds } 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds /* 2061da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 2071da177e4SLinus Torvalds */ 2081da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 2091da177e4SLinus Torvalds { 2101da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 2111da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 2121da177e4SLinus Torvalds NULL, 0, 1000); 2131da177e4SLinus Torvalds } 2141da177e4SLinus Torvalds 2151da177e4SLinus Torvalds /* 2161da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 2171da177e4SLinus Torvalds * for info about using port indicators 2181da177e4SLinus Torvalds */ 2191da177e4SLinus Torvalds static void set_port_led( 2201da177e4SLinus Torvalds struct usb_hub *hub, 2211da177e4SLinus Torvalds int port1, 2221da177e4SLinus Torvalds int selector 2231da177e4SLinus Torvalds ) 2241da177e4SLinus Torvalds { 2251da177e4SLinus Torvalds int status = set_port_feature(hub->hdev, (selector << 8) | port1, 2261da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 2271da177e4SLinus Torvalds if (status < 0) 2281da177e4SLinus Torvalds dev_dbg (hub->intfdev, 2291da177e4SLinus Torvalds "port %d indicator %s status %d\n", 2301da177e4SLinus Torvalds port1, 2311da177e4SLinus Torvalds ({ char *s; switch (selector) { 2321da177e4SLinus Torvalds case HUB_LED_AMBER: s = "amber"; break; 2331da177e4SLinus Torvalds case HUB_LED_GREEN: s = "green"; break; 2341da177e4SLinus Torvalds case HUB_LED_OFF: s = "off"; break; 2351da177e4SLinus Torvalds case HUB_LED_AUTO: s = "auto"; break; 2361da177e4SLinus Torvalds default: s = "??"; break; 2371da177e4SLinus Torvalds }; s; }), 2381da177e4SLinus Torvalds status); 2391da177e4SLinus Torvalds } 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 2421da177e4SLinus Torvalds 243c4028958SDavid Howells static void led_work (struct work_struct *work) 2441da177e4SLinus Torvalds { 245c4028958SDavid Howells struct usb_hub *hub = 246c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 2471da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 2481da177e4SLinus Torvalds unsigned i; 2491da177e4SLinus Torvalds unsigned changed = 0; 2501da177e4SLinus Torvalds int cursor = -1; 2511da177e4SLinus Torvalds 2521da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 2531da177e4SLinus Torvalds return; 2541da177e4SLinus Torvalds 2551da177e4SLinus Torvalds for (i = 0; i < hub->descriptor->bNbrPorts; i++) { 2561da177e4SLinus Torvalds unsigned selector, mode; 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds /* 30%-50% duty cycle */ 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds switch (hub->indicator[i]) { 2611da177e4SLinus Torvalds /* cycle marker */ 2621da177e4SLinus Torvalds case INDICATOR_CYCLE: 2631da177e4SLinus Torvalds cursor = i; 2641da177e4SLinus Torvalds selector = HUB_LED_AUTO; 2651da177e4SLinus Torvalds mode = INDICATOR_AUTO; 2661da177e4SLinus Torvalds break; 2671da177e4SLinus Torvalds /* blinking green = sw attention */ 2681da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 2691da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2701da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 2711da177e4SLinus Torvalds break; 2721da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 2731da177e4SLinus Torvalds selector = HUB_LED_OFF; 2741da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 2751da177e4SLinus Torvalds break; 2761da177e4SLinus Torvalds /* blinking amber = hw attention */ 2771da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 2781da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2791da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 2801da177e4SLinus Torvalds break; 2811da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 2821da177e4SLinus Torvalds selector = HUB_LED_OFF; 2831da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 2841da177e4SLinus Torvalds break; 2851da177e4SLinus Torvalds /* blink green/amber = reserved */ 2861da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 2871da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2881da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 2891da177e4SLinus Torvalds break; 2901da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 2911da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2921da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 2931da177e4SLinus Torvalds break; 2941da177e4SLinus Torvalds default: 2951da177e4SLinus Torvalds continue; 2961da177e4SLinus Torvalds } 2971da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 2981da177e4SLinus Torvalds changed = 1; 2991da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 3001da177e4SLinus Torvalds hub->indicator[i] = mode; 3011da177e4SLinus Torvalds } 3021da177e4SLinus Torvalds if (!changed && blinkenlights) { 3031da177e4SLinus Torvalds cursor++; 3041da177e4SLinus Torvalds cursor %= hub->descriptor->bNbrPorts; 3051da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 3061da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 3071da177e4SLinus Torvalds changed++; 3081da177e4SLinus Torvalds } 3091da177e4SLinus Torvalds if (changed) 3101da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 3111da177e4SLinus Torvalds } 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 3141da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 3151da177e4SLinus Torvalds #define USB_STS_RETRIES 5 3161da177e4SLinus Torvalds 3171da177e4SLinus Torvalds /* 3181da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 3191da177e4SLinus Torvalds */ 3201da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 3211da177e4SLinus Torvalds struct usb_hub_status *data) 3221da177e4SLinus Torvalds { 3231da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 3261da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3271da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 3281da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 3291da177e4SLinus Torvalds } 3301da177e4SLinus Torvalds return status; 3311da177e4SLinus Torvalds } 3321da177e4SLinus Torvalds 3331da177e4SLinus Torvalds /* 3341da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 3351da177e4SLinus Torvalds */ 3361da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 3371da177e4SLinus Torvalds struct usb_port_status *data) 3381da177e4SLinus Torvalds { 3391da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 3421da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3431da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 3441da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 3451da177e4SLinus Torvalds } 3461da177e4SLinus Torvalds return status; 3471da177e4SLinus Torvalds } 3481da177e4SLinus Torvalds 3493eb14915SAlan Stern static int hub_port_status(struct usb_hub *hub, int port1, 3503eb14915SAlan Stern u16 *status, u16 *change) 3513eb14915SAlan Stern { 3523eb14915SAlan Stern int ret; 3533eb14915SAlan Stern 3543eb14915SAlan Stern mutex_lock(&hub->status_mutex); 3553eb14915SAlan Stern ret = get_port_status(hub->hdev, port1, &hub->status->port); 3563eb14915SAlan Stern if (ret < 4) { 3573eb14915SAlan Stern dev_err(hub->intfdev, 3583eb14915SAlan Stern "%s failed (err = %d)\n", __func__, ret); 3593eb14915SAlan Stern if (ret >= 0) 3603eb14915SAlan Stern ret = -EIO; 3613eb14915SAlan Stern } else { 3623eb14915SAlan Stern *status = le16_to_cpu(hub->status->port.wPortStatus); 3633eb14915SAlan Stern *change = le16_to_cpu(hub->status->port.wPortChange); 3643eb14915SAlan Stern ret = 0; 3653eb14915SAlan Stern } 3663eb14915SAlan Stern mutex_unlock(&hub->status_mutex); 3673eb14915SAlan Stern return ret; 3683eb14915SAlan Stern } 3693eb14915SAlan Stern 3701da177e4SLinus Torvalds static void kick_khubd(struct usb_hub *hub) 3711da177e4SLinus Torvalds { 3721da177e4SLinus Torvalds unsigned long flags; 3731da177e4SLinus Torvalds 37440f122f3SAlan Stern /* Suppress autosuspend until khubd runs */ 37540f122f3SAlan Stern to_usb_interface(hub->intfdev)->pm_usage_cnt = 1; 37640f122f3SAlan Stern 3771da177e4SLinus Torvalds spin_lock_irqsave(&hub_event_lock, flags); 3782e2c5eeaSRoel Kluin if (!hub->disconnected && list_empty(&hub->event_list)) { 3791da177e4SLinus Torvalds list_add_tail(&hub->event_list, &hub_event_list); 3801da177e4SLinus Torvalds wake_up(&khubd_wait); 3811da177e4SLinus Torvalds } 3821da177e4SLinus Torvalds spin_unlock_irqrestore(&hub_event_lock, flags); 3831da177e4SLinus Torvalds } 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds void usb_kick_khubd(struct usb_device *hdev) 3861da177e4SLinus Torvalds { 387e8054854SAlan Stern /* FIXME: What if hdev isn't bound to the hub driver? */ 3881da177e4SLinus Torvalds kick_khubd(hdev_to_hub(hdev)); 3891da177e4SLinus Torvalds } 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 3937d12e780SDavid Howells static void hub_irq(struct urb *urb) 3941da177e4SLinus Torvalds { 395ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 396e015268dSAlan Stern int status = urb->status; 39771d2718fSRoel Kluin unsigned i; 3981da177e4SLinus Torvalds unsigned long bits; 3991da177e4SLinus Torvalds 400e015268dSAlan Stern switch (status) { 4011da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 4021da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 4031da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 4041da177e4SLinus Torvalds return; 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds default: /* presumably an error */ 4071da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 408e015268dSAlan Stern dev_dbg (hub->intfdev, "transfer --> %d\n", status); 4091da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 4101da177e4SLinus Torvalds goto resubmit; 411e015268dSAlan Stern hub->error = status; 4121da177e4SLinus Torvalds /* FALL THROUGH */ 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds /* let khubd handle things */ 4151da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 4161da177e4SLinus Torvalds bits = 0; 4171da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 4181da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 4191da177e4SLinus Torvalds << (i*8); 4201da177e4SLinus Torvalds hub->event_bits[0] = bits; 4211da177e4SLinus Torvalds break; 4221da177e4SLinus Torvalds } 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds hub->nerrors = 0; 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds /* Something happened, let khubd figure it out */ 4271da177e4SLinus Torvalds kick_khubd(hub); 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds resubmit: 4301da177e4SLinus Torvalds if (hub->quiescing) 4311da177e4SLinus Torvalds return; 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvalds if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 4341da177e4SLinus Torvalds && status != -ENODEV && status != -EPERM) 4351da177e4SLinus Torvalds dev_err (hub->intfdev, "resubmit --> %d\n", status); 4361da177e4SLinus Torvalds } 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 4391da177e4SLinus Torvalds static inline int 4401da177e4SLinus Torvalds hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) 4411da177e4SLinus Torvalds { 4421da177e4SLinus Torvalds return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 4431da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 4441da177e4SLinus Torvalds tt, NULL, 0, 1000); 4451da177e4SLinus Torvalds } 4461da177e4SLinus Torvalds 4471da177e4SLinus Torvalds /* 4481da177e4SLinus Torvalds * enumeration blocks khubd for a long time. we use keventd instead, since 4491da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 4501da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 4511da177e4SLinus Torvalds * both can talk to the same hub concurrently. 4521da177e4SLinus Torvalds */ 453c4028958SDavid Howells static void hub_tt_kevent (struct work_struct *work) 4541da177e4SLinus Torvalds { 455c4028958SDavid Howells struct usb_hub *hub = 456c4028958SDavid Howells container_of(work, struct usb_hub, tt.kevent); 4571da177e4SLinus Torvalds unsigned long flags; 45855e5fdfaSMark Lord int limit = 100; 4591da177e4SLinus Torvalds 4601da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 46155e5fdfaSMark Lord while (--limit && !list_empty (&hub->tt.clear_list)) { 462d0f830d3SH Hartley Sweeten struct list_head *next; 4631da177e4SLinus Torvalds struct usb_tt_clear *clear; 4641da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4651da177e4SLinus Torvalds int status; 4661da177e4SLinus Torvalds 467d0f830d3SH Hartley Sweeten next = hub->tt.clear_list.next; 468d0f830d3SH Hartley Sweeten clear = list_entry (next, struct usb_tt_clear, clear_list); 4691da177e4SLinus Torvalds list_del (&clear->clear_list); 4701da177e4SLinus Torvalds 4711da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 4721da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 4731da177e4SLinus Torvalds status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 4741da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds if (status) 4771da177e4SLinus Torvalds dev_err (&hdev->dev, 4781da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 4791da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 4801da177e4SLinus Torvalds kfree(clear); 4811da177e4SLinus Torvalds } 4821da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 4831da177e4SLinus Torvalds } 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds /** 4861da177e4SLinus Torvalds * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub 4871da177e4SLinus Torvalds * @udev: the device whose split transaction failed 4881da177e4SLinus Torvalds * @pipe: identifies the endpoint of the failed transaction 4891da177e4SLinus Torvalds * 4901da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 4911da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 4921da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 4931da177e4SLinus Torvalds * interrupt context. 4941da177e4SLinus Torvalds * 4951da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 4961da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 4971da177e4SLinus Torvalds */ 4981da177e4SLinus Torvalds void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe) 4991da177e4SLinus Torvalds { 5001da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 5011da177e4SLinus Torvalds unsigned long flags; 5021da177e4SLinus Torvalds struct usb_tt_clear *clear; 5031da177e4SLinus Torvalds 5041da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 5051da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 5061da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 5071da177e4SLinus Torvalds */ 50854e6ecb2SChristoph Lameter if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { 5091da177e4SLinus Torvalds dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 5101da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 5111da177e4SLinus Torvalds return; 5121da177e4SLinus Torvalds } 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 5151da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 5161da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 5171da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 5181da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol (pipe) 5191da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 5201da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 5211da177e4SLinus Torvalds if (usb_pipein (pipe)) 5221da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 5251da177e4SLinus Torvalds spin_lock_irqsave (&tt->lock, flags); 5261da177e4SLinus Torvalds list_add_tail (&clear->clear_list, &tt->clear_list); 5271da177e4SLinus Torvalds schedule_work (&tt->kevent); 5281da177e4SLinus Torvalds spin_unlock_irqrestore (&tt->lock, flags); 5291da177e4SLinus Torvalds } 530782e70c6SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(usb_hub_tt_clear_buffer); 5311da177e4SLinus Torvalds 5328520f380SAlan Stern /* If do_delay is false, return the number of milliseconds the caller 5338520f380SAlan Stern * needs to delay. 5348520f380SAlan Stern */ 5358520f380SAlan Stern static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) 5361da177e4SLinus Torvalds { 5371da177e4SLinus Torvalds int port1; 538b789696aSDavid Brownell unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 5398520f380SAlan Stern unsigned delay; 5404489a571SAlan Stern u16 wHubCharacteristics = 5414489a571SAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 5421da177e4SLinus Torvalds 5434489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 5444489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 5454489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 5464489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 5474489a571SAlan Stern * unless we send these messages to the hub. 5484489a571SAlan Stern */ 5494489a571SAlan Stern if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) 5501da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 5514489a571SAlan Stern else 5524489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 5534489a571SAlan Stern "non-switchable hub\n"); 5541da177e4SLinus Torvalds for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) 5554489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 5561da177e4SLinus Torvalds 557b789696aSDavid Brownell /* Wait at least 100 msec for power to become stable */ 5588520f380SAlan Stern delay = max(pgood_delay, (unsigned) 100); 5598520f380SAlan Stern if (do_delay) 5608520f380SAlan Stern msleep(delay); 5618520f380SAlan Stern return delay; 5621da177e4SLinus Torvalds } 5631da177e4SLinus Torvalds 5641da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 5651da177e4SLinus Torvalds u16 *status, u16 *change) 5661da177e4SLinus Torvalds { 5671da177e4SLinus Torvalds int ret; 5681da177e4SLinus Torvalds 569db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 5701da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 5711da177e4SLinus Torvalds if (ret < 0) 5721da177e4SLinus Torvalds dev_err (hub->intfdev, 573441b62c1SHarvey Harrison "%s failed (err = %d)\n", __func__, ret); 5741da177e4SLinus Torvalds else { 5751da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 5761da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 5771da177e4SLinus Torvalds ret = 0; 5781da177e4SLinus Torvalds } 579db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 5801da177e4SLinus Torvalds return ret; 5811da177e4SLinus Torvalds } 5821da177e4SLinus Torvalds 5838b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 5848b28c752SAlan Stern { 5858b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 5860458d5b4SAlan Stern int ret = 0; 5878b28c752SAlan Stern 5880458d5b4SAlan Stern if (hdev->children[port1-1] && set_state) 5898b28c752SAlan Stern usb_set_device_state(hdev->children[port1-1], 5908b28c752SAlan Stern USB_STATE_NOTATTACHED); 5910458d5b4SAlan Stern if (!hub->error) 5928b28c752SAlan Stern ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); 5938b28c752SAlan Stern if (ret) 5948b28c752SAlan Stern dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 5958b28c752SAlan Stern port1, ret); 5968b28c752SAlan Stern return ret; 5978b28c752SAlan Stern } 5988b28c752SAlan Stern 5990458d5b4SAlan Stern /* 6000458d5b4SAlan Stern * Disable a port and mark a logical connnect-change event, so that some 6010458d5b4SAlan Stern * time later khubd will disconnect() any existing usb_device on the port 6020458d5b4SAlan Stern * and will re-enumerate if there actually is a device attached. 6030458d5b4SAlan Stern */ 6040458d5b4SAlan Stern static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 6057d069b7dSAlan Stern { 6060458d5b4SAlan Stern dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 6070458d5b4SAlan Stern hub_port_disable(hub, port1, 1); 6080458d5b4SAlan Stern 6090458d5b4SAlan Stern /* FIXME let caller ask to power down the port: 6100458d5b4SAlan Stern * - some devices won't enumerate without a VBUS power cycle 6110458d5b4SAlan Stern * - SRP saves power that way 6120458d5b4SAlan Stern * - ... new call, TBD ... 6130458d5b4SAlan Stern * That's easy if this hub can switch power per-port, and 6140458d5b4SAlan Stern * khubd reactivates the port later (timer, SRP, etc). 6150458d5b4SAlan Stern * Powerdown must be optional, because of reset/DFU. 6160458d5b4SAlan Stern */ 6170458d5b4SAlan Stern 6180458d5b4SAlan Stern set_bit(port1, hub->change_bits); 6190458d5b4SAlan Stern kick_khubd(hub); 6200458d5b4SAlan Stern } 6210458d5b4SAlan Stern 6226ee0b270SAlan Stern enum hub_activation_type { 6238520f380SAlan Stern HUB_INIT, HUB_INIT2, HUB_INIT3, 6248520f380SAlan Stern HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, 6256ee0b270SAlan Stern }; 6265e6effaeSAlan Stern 6278520f380SAlan Stern static void hub_init_func2(struct work_struct *ws); 6288520f380SAlan Stern static void hub_init_func3(struct work_struct *ws); 6298520f380SAlan Stern 630f2835219SAlan Stern static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) 6315e6effaeSAlan Stern { 6325e6effaeSAlan Stern struct usb_device *hdev = hub->hdev; 6335e6effaeSAlan Stern int port1; 634f2835219SAlan Stern int status; 635948fea37SAlan Stern bool need_debounce_delay = false; 6368520f380SAlan Stern unsigned delay; 6378520f380SAlan Stern 6388520f380SAlan Stern /* Continue a partial initialization */ 6398520f380SAlan Stern if (type == HUB_INIT2) 6408520f380SAlan Stern goto init2; 6418520f380SAlan Stern if (type == HUB_INIT3) 6428520f380SAlan Stern goto init3; 6435e6effaeSAlan Stern 644f2835219SAlan Stern /* After a resume, port power should still be on. 645f2835219SAlan Stern * For any other type of activation, turn it on. 646f2835219SAlan Stern */ 6478520f380SAlan Stern if (type != HUB_RESUME) { 6488520f380SAlan Stern 6498520f380SAlan Stern /* Speed up system boot by using a delayed_work for the 6508520f380SAlan Stern * hub's initial power-up delays. This is pretty awkward 6518520f380SAlan Stern * and the implementation looks like a home-brewed sort of 6528520f380SAlan Stern * setjmp/longjmp, but it saves at least 100 ms for each 6538520f380SAlan Stern * root hub (assuming usbcore is compiled into the kernel 6548520f380SAlan Stern * rather than as a module). It adds up. 6558520f380SAlan Stern * 6568520f380SAlan Stern * This can't be done for HUB_RESUME or HUB_RESET_RESUME 6578520f380SAlan Stern * because for those activation types the ports have to be 6588520f380SAlan Stern * operational when we return. In theory this could be done 6598520f380SAlan Stern * for HUB_POST_RESET, but it's easier not to. 6608520f380SAlan Stern */ 6618520f380SAlan Stern if (type == HUB_INIT) { 6628520f380SAlan Stern delay = hub_power_on(hub, false); 6638520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); 6648520f380SAlan Stern schedule_delayed_work(&hub->init_work, 6658520f380SAlan Stern msecs_to_jiffies(delay)); 66661fbeba1SAlan Stern 66761fbeba1SAlan Stern /* Suppress autosuspend until init is done */ 66861fbeba1SAlan Stern to_usb_interface(hub->intfdev)->pm_usage_cnt = 1; 6698520f380SAlan Stern return; /* Continues at init2: below */ 6708520f380SAlan Stern } else { 6718520f380SAlan Stern hub_power_on(hub, true); 6728520f380SAlan Stern } 6738520f380SAlan Stern } 6748520f380SAlan Stern init2: 675f2835219SAlan Stern 6766ee0b270SAlan Stern /* Check each port and set hub->change_bits to let khubd know 6776ee0b270SAlan Stern * which ports need attention. 6785e6effaeSAlan Stern */ 6795e6effaeSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 6805e6effaeSAlan Stern struct usb_device *udev = hdev->children[port1-1]; 6815e6effaeSAlan Stern u16 portstatus, portchange; 6825e6effaeSAlan Stern 6836ee0b270SAlan Stern portstatus = portchange = 0; 6846ee0b270SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 6856ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 6866ee0b270SAlan Stern dev_dbg(hub->intfdev, 6876ee0b270SAlan Stern "port %d: status %04x change %04x\n", 6886ee0b270SAlan Stern port1, portstatus, portchange); 6895e6effaeSAlan Stern 6906ee0b270SAlan Stern /* After anything other than HUB_RESUME (i.e., initialization 6916ee0b270SAlan Stern * or any sort of reset), every port should be disabled. 6926ee0b270SAlan Stern * Unconnected ports should likewise be disabled (paranoia), 6936ee0b270SAlan Stern * and so should ports for which we have no usb_device. 6945e6effaeSAlan Stern */ 6956ee0b270SAlan Stern if ((portstatus & USB_PORT_STAT_ENABLE) && ( 6966ee0b270SAlan Stern type != HUB_RESUME || 6976ee0b270SAlan Stern !(portstatus & USB_PORT_STAT_CONNECTION) || 6986ee0b270SAlan Stern !udev || 6996ee0b270SAlan Stern udev->state == USB_STATE_NOTATTACHED)) { 7006ee0b270SAlan Stern clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); 7016ee0b270SAlan Stern portstatus &= ~USB_PORT_STAT_ENABLE; 7026ee0b270SAlan Stern } 7036ee0b270SAlan Stern 704948fea37SAlan Stern /* Clear status-change flags; we'll debounce later */ 705948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) { 706948fea37SAlan Stern need_debounce_delay = true; 707948fea37SAlan Stern clear_port_feature(hub->hdev, port1, 708948fea37SAlan Stern USB_PORT_FEAT_C_CONNECTION); 709948fea37SAlan Stern } 710948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) { 711948fea37SAlan Stern need_debounce_delay = true; 712948fea37SAlan Stern clear_port_feature(hub->hdev, port1, 713948fea37SAlan Stern USB_PORT_FEAT_C_ENABLE); 714948fea37SAlan Stern } 715948fea37SAlan Stern 7166ee0b270SAlan Stern if (!udev || udev->state == USB_STATE_NOTATTACHED) { 7176ee0b270SAlan Stern /* Tell khubd to disconnect the device or 7186ee0b270SAlan Stern * check for a new connection 7196ee0b270SAlan Stern */ 7206ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 7216ee0b270SAlan Stern set_bit(port1, hub->change_bits); 7226ee0b270SAlan Stern 7236ee0b270SAlan Stern } else if (portstatus & USB_PORT_STAT_ENABLE) { 7246ee0b270SAlan Stern /* The power session apparently survived the resume. 7256ee0b270SAlan Stern * If there was an overcurrent or suspend change 7266ee0b270SAlan Stern * (i.e., remote wakeup request), have khubd 7276ee0b270SAlan Stern * take care of it. 7286ee0b270SAlan Stern */ 7296ee0b270SAlan Stern if (portchange) 7306ee0b270SAlan Stern set_bit(port1, hub->change_bits); 7316ee0b270SAlan Stern 7326ee0b270SAlan Stern } else if (udev->persist_enabled) { 7336ee0b270SAlan Stern #ifdef CONFIG_PM 7345e6effaeSAlan Stern udev->reset_resume = 1; 7356ee0b270SAlan Stern #endif 7368808f00cSAlan Stern set_bit(port1, hub->change_bits); 7378808f00cSAlan Stern 7386ee0b270SAlan Stern } else { 7396ee0b270SAlan Stern /* The power session is gone; tell khubd */ 7406ee0b270SAlan Stern usb_set_device_state(udev, USB_STATE_NOTATTACHED); 7416ee0b270SAlan Stern set_bit(port1, hub->change_bits); 7425e6effaeSAlan Stern } 7435e6effaeSAlan Stern } 7445e6effaeSAlan Stern 745948fea37SAlan Stern /* If no port-status-change flags were set, we don't need any 746948fea37SAlan Stern * debouncing. If flags were set we can try to debounce the 747948fea37SAlan Stern * ports all at once right now, instead of letting khubd do them 748948fea37SAlan Stern * one at a time later on. 749948fea37SAlan Stern * 750948fea37SAlan Stern * If any port-status changes do occur during this delay, khubd 751948fea37SAlan Stern * will see them later and handle them normally. 752948fea37SAlan Stern */ 7538520f380SAlan Stern if (need_debounce_delay) { 7548520f380SAlan Stern delay = HUB_DEBOUNCE_STABLE; 755f2835219SAlan Stern 7568520f380SAlan Stern /* Don't do a long sleep inside a workqueue routine */ 7578520f380SAlan Stern if (type == HUB_INIT2) { 7588520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); 7598520f380SAlan Stern schedule_delayed_work(&hub->init_work, 7608520f380SAlan Stern msecs_to_jiffies(delay)); 7618520f380SAlan Stern return; /* Continues at init3: below */ 7628520f380SAlan Stern } else { 7638520f380SAlan Stern msleep(delay); 7648520f380SAlan Stern } 7658520f380SAlan Stern } 7668520f380SAlan Stern init3: 767f2835219SAlan Stern hub->quiescing = 0; 768f2835219SAlan Stern 769f2835219SAlan Stern status = usb_submit_urb(hub->urb, GFP_NOIO); 770f2835219SAlan Stern if (status < 0) 771f2835219SAlan Stern dev_err(hub->intfdev, "activate --> %d\n", status); 772f2835219SAlan Stern if (hub->has_indicators && blinkenlights) 773f2835219SAlan Stern schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 774f2835219SAlan Stern 775f2835219SAlan Stern /* Scan all ports that need attention */ 776f2835219SAlan Stern kick_khubd(hub); 7775e6effaeSAlan Stern } 7785e6effaeSAlan Stern 7798520f380SAlan Stern /* Implement the continuations for the delays above */ 7808520f380SAlan Stern static void hub_init_func2(struct work_struct *ws) 7818520f380SAlan Stern { 7828520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 7838520f380SAlan Stern 7848520f380SAlan Stern hub_activate(hub, HUB_INIT2); 7858520f380SAlan Stern } 7868520f380SAlan Stern 7878520f380SAlan Stern static void hub_init_func3(struct work_struct *ws) 7888520f380SAlan Stern { 7898520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 7908520f380SAlan Stern 7918520f380SAlan Stern hub_activate(hub, HUB_INIT3); 7928520f380SAlan Stern } 7938520f380SAlan Stern 7944330354fSAlan Stern enum hub_quiescing_type { 7954330354fSAlan Stern HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND 7964330354fSAlan Stern }; 7974330354fSAlan Stern 7984330354fSAlan Stern static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) 7994330354fSAlan Stern { 8004330354fSAlan Stern struct usb_device *hdev = hub->hdev; 8014330354fSAlan Stern int i; 8024330354fSAlan Stern 8038520f380SAlan Stern cancel_delayed_work_sync(&hub->init_work); 8048520f380SAlan Stern 8054330354fSAlan Stern /* khubd and related activity won't re-trigger */ 8064330354fSAlan Stern hub->quiescing = 1; 8074330354fSAlan Stern 8084330354fSAlan Stern if (type != HUB_SUSPEND) { 8094330354fSAlan Stern /* Disconnect all the children */ 8104330354fSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 8114330354fSAlan Stern if (hdev->children[i]) 8124330354fSAlan Stern usb_disconnect(&hdev->children[i]); 8134330354fSAlan Stern } 8144330354fSAlan Stern } 8154330354fSAlan Stern 8164330354fSAlan Stern /* Stop khubd and related activity */ 8174330354fSAlan Stern usb_kill_urb(hub->urb); 8184330354fSAlan Stern if (hub->has_indicators) 8194330354fSAlan Stern cancel_delayed_work_sync(&hub->leds); 8204330354fSAlan Stern if (hub->tt.hub) 8214330354fSAlan Stern cancel_work_sync(&hub->tt.kevent); 8224330354fSAlan Stern } 8234330354fSAlan Stern 8243eb14915SAlan Stern /* caller has locked the hub device */ 8253eb14915SAlan Stern static int hub_pre_reset(struct usb_interface *intf) 8263eb14915SAlan Stern { 8273eb14915SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 8283eb14915SAlan Stern 8294330354fSAlan Stern hub_quiesce(hub, HUB_PRE_RESET); 830f07600cfSAlan Stern return 0; 8317d069b7dSAlan Stern } 8327d069b7dSAlan Stern 8337d069b7dSAlan Stern /* caller has locked the hub device */ 834f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 8357d069b7dSAlan Stern { 8367de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 8377de18d8bSAlan Stern 838f2835219SAlan Stern hub_activate(hub, HUB_POST_RESET); 839f07600cfSAlan Stern return 0; 8407d069b7dSAlan Stern } 8417d069b7dSAlan Stern 8421da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 8431da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 8441da177e4SLinus Torvalds { 8451da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 8461da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 8471da177e4SLinus Torvalds u16 hubstatus, hubchange; 84874ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 8491da177e4SLinus Torvalds unsigned int pipe; 8501da177e4SLinus Torvalds int maxp, ret; 8511da177e4SLinus Torvalds char *message; 8521da177e4SLinus Torvalds 8531da177e4SLinus Torvalds hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL, 8541da177e4SLinus Torvalds &hub->buffer_dma); 8551da177e4SLinus Torvalds if (!hub->buffer) { 8561da177e4SLinus Torvalds message = "can't allocate hub irq buffer"; 8571da177e4SLinus Torvalds ret = -ENOMEM; 8581da177e4SLinus Torvalds goto fail; 8591da177e4SLinus Torvalds } 8601da177e4SLinus Torvalds 8611da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 8621da177e4SLinus Torvalds if (!hub->status) { 8631da177e4SLinus Torvalds message = "can't kmalloc hub status buffer"; 8641da177e4SLinus Torvalds ret = -ENOMEM; 8651da177e4SLinus Torvalds goto fail; 8661da177e4SLinus Torvalds } 867db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 8681da177e4SLinus Torvalds 8691da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 8701da177e4SLinus Torvalds if (!hub->descriptor) { 8711da177e4SLinus Torvalds message = "can't kmalloc hub descriptor"; 8721da177e4SLinus Torvalds ret = -ENOMEM; 8731da177e4SLinus Torvalds goto fail; 8741da177e4SLinus Torvalds } 8751da177e4SLinus Torvalds 8761da177e4SLinus Torvalds /* Request the entire hub descriptor. 8771da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 8781da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 8791da177e4SLinus Torvalds */ 8801da177e4SLinus Torvalds ret = get_hub_descriptor(hdev, hub->descriptor, 8811da177e4SLinus Torvalds sizeof(*hub->descriptor)); 8821da177e4SLinus Torvalds if (ret < 0) { 8831da177e4SLinus Torvalds message = "can't read hub descriptor"; 8841da177e4SLinus Torvalds goto fail; 8851da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 8861da177e4SLinus Torvalds message = "hub has too many ports!"; 8871da177e4SLinus Torvalds ret = -ENODEV; 8881da177e4SLinus Torvalds goto fail; 8891da177e4SLinus Torvalds } 8901da177e4SLinus Torvalds 8911da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 8921da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 8931da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 8941da177e4SLinus Torvalds 89574ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 8961da177e4SLinus Torvalds 89774ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_COMPOUND) { 8981da177e4SLinus Torvalds int i; 8991da177e4SLinus Torvalds char portstr [USB_MAXCHILDREN + 1]; 9001da177e4SLinus Torvalds 9011da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 9021da177e4SLinus Torvalds portstr[i] = hub->descriptor->DeviceRemovable 9031da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 9041da177e4SLinus Torvalds ? 'F' : 'R'; 9051da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 9061da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 9071da177e4SLinus Torvalds } else 9081da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 9091da177e4SLinus Torvalds 91074ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 9111da177e4SLinus Torvalds case 0x00: 9121da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 9131da177e4SLinus Torvalds break; 9141da177e4SLinus Torvalds case 0x01: 9151da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 9161da177e4SLinus Torvalds break; 9171da177e4SLinus Torvalds case 0x02: 9181da177e4SLinus Torvalds case 0x03: 9191da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 9201da177e4SLinus Torvalds break; 9211da177e4SLinus Torvalds } 9221da177e4SLinus Torvalds 92374ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 9241da177e4SLinus Torvalds case 0x00: 9251da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 9261da177e4SLinus Torvalds break; 9271da177e4SLinus Torvalds case 0x08: 9281da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 9291da177e4SLinus Torvalds break; 9301da177e4SLinus Torvalds case 0x10: 9311da177e4SLinus Torvalds case 0x18: 9321da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 9331da177e4SLinus Torvalds break; 9341da177e4SLinus Torvalds } 9351da177e4SLinus Torvalds 9361da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 9371da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 938c4028958SDavid Howells INIT_WORK (&hub->tt.kevent, hub_tt_kevent); 9391da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 9401da177e4SLinus Torvalds case 0: 9411da177e4SLinus Torvalds break; 9421da177e4SLinus Torvalds case 1: 9431da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 9441da177e4SLinus Torvalds hub->tt.hub = hdev; 9451da177e4SLinus Torvalds break; 9461da177e4SLinus Torvalds case 2: 9471da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 9481da177e4SLinus Torvalds if (ret == 0) { 9491da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 9501da177e4SLinus Torvalds hub->tt.multi = 1; 9511da177e4SLinus Torvalds } else 9521da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 9531da177e4SLinus Torvalds ret); 9541da177e4SLinus Torvalds hub->tt.hub = hdev; 9551da177e4SLinus Torvalds break; 956d2e9b4d6SSarah Sharp case 3: 957d2e9b4d6SSarah Sharp /* USB 3.0 hubs don't have a TT */ 958d2e9b4d6SSarah Sharp break; 9591da177e4SLinus Torvalds default: 9601da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 9611da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 9621da177e4SLinus Torvalds break; 9631da177e4SLinus Torvalds } 9641da177e4SLinus Torvalds 965e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 96674ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 967e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 968e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 969e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 970e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 971e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 972e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 973e09711aeSdavid-b@pacbell.net } 9741da177e4SLinus Torvalds break; 975e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 976e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 977e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 978e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 979e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 9801da177e4SLinus Torvalds break; 981e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 982e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 983e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 984e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 985e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 9861da177e4SLinus Torvalds break; 987e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 988e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 989e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 990e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 991e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 9921da177e4SLinus Torvalds break; 9931da177e4SLinus Torvalds } 9941da177e4SLinus Torvalds 9951da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 99674ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 9971da177e4SLinus Torvalds hub->has_indicators = 1; 9981da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 9991da177e4SLinus Torvalds } 10001da177e4SLinus Torvalds 10011da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 10021da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 10031da177e4SLinus Torvalds 10041da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 10051da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 10061da177e4SLinus Torvalds */ 10071da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 100855c52718SAlan Stern if (ret < 2) { 10091da177e4SLinus Torvalds message = "can't get hub status"; 10101da177e4SLinus Torvalds goto fail; 10111da177e4SLinus Torvalds } 10127d35b929SAlan Stern le16_to_cpus(&hubstatus); 10137d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 101455c52718SAlan Stern if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) 101555c52718SAlan Stern hub->mA_per_port = 500; 101655c52718SAlan Stern else { 101755c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 101855c52718SAlan Stern hub->limited_power = 1; 101955c52718SAlan Stern } 10207d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 10211da177e4SLinus Torvalds dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 10221da177e4SLinus Torvalds hub->descriptor->bHubContrCurrent); 102355c52718SAlan Stern hub->limited_power = 1; 102455c52718SAlan Stern if (hdev->maxchild > 0) { 102555c52718SAlan Stern int remaining = hdev->bus_mA - 102655c52718SAlan Stern hub->descriptor->bHubContrCurrent; 10271da177e4SLinus Torvalds 102855c52718SAlan Stern if (remaining < hdev->maxchild * 100) 102955c52718SAlan Stern dev_warn(hub_dev, 103055c52718SAlan Stern "insufficient power available " 103155c52718SAlan Stern "to use all downstream ports\n"); 103255c52718SAlan Stern hub->mA_per_port = 100; /* 7.2.1.1 */ 103355c52718SAlan Stern } 103455c52718SAlan Stern } else { /* Self-powered external hub */ 103555c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 103655c52718SAlan Stern * provide less current per port? */ 103755c52718SAlan Stern hub->mA_per_port = 500; 103855c52718SAlan Stern } 103955c52718SAlan Stern if (hub->mA_per_port < 500) 104055c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 104155c52718SAlan Stern hub->mA_per_port); 10421da177e4SLinus Torvalds 10431da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 10441da177e4SLinus Torvalds if (ret < 0) { 10451da177e4SLinus Torvalds message = "can't get hub status"; 10461da177e4SLinus Torvalds goto fail; 10471da177e4SLinus Torvalds } 10481da177e4SLinus Torvalds 10491da177e4SLinus Torvalds /* local power status reports aren't always correct */ 10501da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 10511da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 10521da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 10531da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 10541da177e4SLinus Torvalds 105574ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 10561da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 10571da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 10581da177e4SLinus Torvalds 105988fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 106088fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 106188fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 106288fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 106388fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 106488fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 10651da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 10661da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 10671da177e4SLinus Torvalds 10681da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 10691da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 10701da177e4SLinus Torvalds 10711da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 10721da177e4SLinus Torvalds if (!hub->urb) { 10731da177e4SLinus Torvalds message = "couldn't allocate interrupt urb"; 10741da177e4SLinus Torvalds ret = -ENOMEM; 10751da177e4SLinus Torvalds goto fail; 10761da177e4SLinus Torvalds } 10771da177e4SLinus Torvalds 10781da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 10791da177e4SLinus Torvalds hub, endpoint->bInterval); 10801da177e4SLinus Torvalds hub->urb->transfer_dma = hub->buffer_dma; 10811da177e4SLinus Torvalds hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 10821da177e4SLinus Torvalds 10831da177e4SLinus Torvalds /* maybe cycle the hub leds */ 10841da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 10851da177e4SLinus Torvalds hub->indicator [0] = INDICATOR_CYCLE; 10861da177e4SLinus Torvalds 1087f2835219SAlan Stern hub_activate(hub, HUB_INIT); 10881da177e4SLinus Torvalds return 0; 10891da177e4SLinus Torvalds 10901da177e4SLinus Torvalds fail: 10911da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 10921da177e4SLinus Torvalds message, ret); 10931da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 10941da177e4SLinus Torvalds return ret; 10951da177e4SLinus Torvalds } 10961da177e4SLinus Torvalds 1097e8054854SAlan Stern static void hub_release(struct kref *kref) 1098e8054854SAlan Stern { 1099e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 1100e8054854SAlan Stern 1101e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 1102e8054854SAlan Stern kfree(hub); 1103e8054854SAlan Stern } 1104e8054854SAlan Stern 11051da177e4SLinus Torvalds static unsigned highspeed_hubs; 11061da177e4SLinus Torvalds 11071da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 11081da177e4SLinus Torvalds { 11091da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 1110e8054854SAlan Stern 1111e8054854SAlan Stern /* Take the hub off the event list and don't let it be added again */ 1112e8054854SAlan Stern spin_lock_irq(&hub_event_lock); 1113e8054854SAlan Stern list_del_init(&hub->event_list); 1114e8054854SAlan Stern hub->disconnected = 1; 1115e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 11161da177e4SLinus Torvalds 11177de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 11187de18d8bSAlan Stern hub->error = 0; 11194330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 11207de18d8bSAlan Stern 11218b28c752SAlan Stern usb_set_intfdata (intf, NULL); 11221da177e4SLinus Torvalds 1123e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 11241da177e4SLinus Torvalds highspeed_hubs--; 11251da177e4SLinus Torvalds 11261da177e4SLinus Torvalds usb_free_urb(hub->urb); 11271da177e4SLinus Torvalds kfree(hub->descriptor); 11281da177e4SLinus Torvalds kfree(hub->status); 1129e8054854SAlan Stern usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer, 11301da177e4SLinus Torvalds hub->buffer_dma); 11311da177e4SLinus Torvalds 1132e8054854SAlan Stern kref_put(&hub->kref, hub_release); 11331da177e4SLinus Torvalds } 11341da177e4SLinus Torvalds 11351da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 11361da177e4SLinus Torvalds { 11371da177e4SLinus Torvalds struct usb_host_interface *desc; 11381da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 11391da177e4SLinus Torvalds struct usb_device *hdev; 11401da177e4SLinus Torvalds struct usb_hub *hub; 11411da177e4SLinus Torvalds 11421da177e4SLinus Torvalds desc = intf->cur_altsetting; 11431da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 11441da177e4SLinus Torvalds 114538f3ad5eSFelipe Balbi if (hdev->level == MAX_TOPO_LEVEL) { 1146b9cef6c3SWu Fengguang dev_err(&intf->dev, 1147b9cef6c3SWu Fengguang "Unsupported bus topology: hub nested too deep\n"); 114838f3ad5eSFelipe Balbi return -E2BIG; 114938f3ad5eSFelipe Balbi } 115038f3ad5eSFelipe Balbi 115189ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 115289ccbdc9SDavid Brownell if (hdev->parent) { 115389ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 115489ccbdc9SDavid Brownell return -ENODEV; 115589ccbdc9SDavid Brownell } 115689ccbdc9SDavid Brownell #endif 115789ccbdc9SDavid Brownell 11581da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 11591da177e4SLinus Torvalds /* specs is not defined, but it works */ 11601da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 11611da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 11621da177e4SLinus Torvalds descriptor_error: 11631da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 11641da177e4SLinus Torvalds return -EIO; 11651da177e4SLinus Torvalds } 11661da177e4SLinus Torvalds 11671da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 11681da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 11691da177e4SLinus Torvalds goto descriptor_error; 11701da177e4SLinus Torvalds 11711da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 11721da177e4SLinus Torvalds 1173fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 1174fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 11751da177e4SLinus Torvalds goto descriptor_error; 11761da177e4SLinus Torvalds 11771da177e4SLinus Torvalds /* We found a hub */ 11781da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 11791da177e4SLinus Torvalds 11800a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 11811da177e4SLinus Torvalds if (!hub) { 11821da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 11831da177e4SLinus Torvalds return -ENOMEM; 11841da177e4SLinus Torvalds } 11851da177e4SLinus Torvalds 1186e8054854SAlan Stern kref_init(&hub->kref); 11871da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 11881da177e4SLinus Torvalds hub->intfdev = &intf->dev; 11891da177e4SLinus Torvalds hub->hdev = hdev; 1190c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 11918520f380SAlan Stern INIT_DELAYED_WORK(&hub->init_work, NULL); 1192e8054854SAlan Stern usb_get_intf(intf); 11931da177e4SLinus Torvalds 11941da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 119540f122f3SAlan Stern intf->needs_remote_wakeup = 1; 11961da177e4SLinus Torvalds 11971da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 11981da177e4SLinus Torvalds highspeed_hubs++; 11991da177e4SLinus Torvalds 12001da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 12011da177e4SLinus Torvalds return 0; 12021da177e4SLinus Torvalds 12031da177e4SLinus Torvalds hub_disconnect (intf); 12041da177e4SLinus Torvalds return -ENODEV; 12051da177e4SLinus Torvalds } 12061da177e4SLinus Torvalds 12071da177e4SLinus Torvalds static int 12081da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 12091da177e4SLinus Torvalds { 12101da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 12111da177e4SLinus Torvalds 12121da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 12131da177e4SLinus Torvalds switch (code) { 12141da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 12151da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 12161da177e4SLinus Torvalds int i; 12171da177e4SLinus Torvalds 12181da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 12191da177e4SLinus Torvalds if (hdev->devnum <= 0) 12201da177e4SLinus Torvalds info->nports = 0; 12211da177e4SLinus Torvalds else { 12221da177e4SLinus Torvalds info->nports = hdev->maxchild; 12231da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 12241da177e4SLinus Torvalds if (hdev->children[i] == NULL) 12251da177e4SLinus Torvalds info->port[i] = 0; 12261da177e4SLinus Torvalds else 12271da177e4SLinus Torvalds info->port[i] = 12281da177e4SLinus Torvalds hdev->children[i]->devnum; 12291da177e4SLinus Torvalds } 12301da177e4SLinus Torvalds } 12311da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 12321da177e4SLinus Torvalds 12331da177e4SLinus Torvalds return info->nports + 1; 12341da177e4SLinus Torvalds } 12351da177e4SLinus Torvalds 12361da177e4SLinus Torvalds default: 12371da177e4SLinus Torvalds return -ENOSYS; 12381da177e4SLinus Torvalds } 12391da177e4SLinus Torvalds } 12401da177e4SLinus Torvalds 12411da177e4SLinus Torvalds 12421da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 12431da177e4SLinus Torvalds { 12441da177e4SLinus Torvalds int i; 12451da177e4SLinus Torvalds 12461da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 12471da177e4SLinus Torvalds if (udev->children[i]) 12481da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev->children[i]); 12491da177e4SLinus Torvalds } 125015123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED) { 1251ee49fb5dSAlan Stern udev->discon_suspended = 1; 125215123006SSarah Sharp udev->active_duration -= jiffies; 125315123006SSarah Sharp } 12541da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 12551da177e4SLinus Torvalds } 12561da177e4SLinus Torvalds 12571da177e4SLinus Torvalds /** 12581da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 12591da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 12601da177e4SLinus Torvalds * @new_state: new state value to be stored 12611da177e4SLinus Torvalds * 12621da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 12631da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 12641da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 12651da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 12661da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 12671da177e4SLinus Torvalds * all changes to any device's state must be protected by the 12681da177e4SLinus Torvalds * device_state_lock spinlock. 12691da177e4SLinus Torvalds * 12701da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 12711da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 12721da177e4SLinus Torvalds * 12731da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 12741da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 12751da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 12761da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 12771da177e4SLinus Torvalds */ 12781da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 12791da177e4SLinus Torvalds enum usb_device_state new_state) 12801da177e4SLinus Torvalds { 12811da177e4SLinus Torvalds unsigned long flags; 12821da177e4SLinus Torvalds 12831da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 12841da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 12851da177e4SLinus Torvalds ; /* do nothing */ 1286b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1287fb669cc0SDavid Brownell 1288fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1289fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1290fb669cc0SDavid Brownell */ 1291fb669cc0SDavid Brownell if (udev->parent) { 1292645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1293645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1294645daaabSAlan Stern ; /* No change to wakeup settings */ 1295645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 1296b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 1297b94dc6b5SDavid Brownell (udev->actconfig->desc.bmAttributes 1298b94dc6b5SDavid Brownell & USB_CONFIG_ATT_WAKEUP)); 1299645daaabSAlan Stern else 1300b94dc6b5SDavid Brownell device_init_wakeup(&udev->dev, 0); 1301fb669cc0SDavid Brownell } 130215123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED && 130315123006SSarah Sharp new_state != USB_STATE_SUSPENDED) 130415123006SSarah Sharp udev->active_duration -= jiffies; 130515123006SSarah Sharp else if (new_state == USB_STATE_SUSPENDED && 130615123006SSarah Sharp udev->state != USB_STATE_SUSPENDED) 130715123006SSarah Sharp udev->active_duration += jiffies; 1308645daaabSAlan Stern udev->state = new_state; 1309b94dc6b5SDavid Brownell } else 13101da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 13111da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 13121da177e4SLinus Torvalds } 13136da9c990SDavid Vrabel EXPORT_SYMBOL_GPL(usb_set_device_state); 13141da177e4SLinus Torvalds 13158af548dcSInaky Perez-Gonzalez /* 13168af548dcSInaky Perez-Gonzalez * WUSB devices are simple: they have no hubs behind, so the mapping 13178af548dcSInaky Perez-Gonzalez * device <-> virtual port number becomes 1:1. Why? to simplify the 13188af548dcSInaky Perez-Gonzalez * life of the device connection logic in 13198af548dcSInaky Perez-Gonzalez * drivers/usb/wusbcore/devconnect.c. When we do the initial secret 13208af548dcSInaky Perez-Gonzalez * handshake we need to assign a temporary address in the unauthorized 13218af548dcSInaky Perez-Gonzalez * space. For simplicity we use the first virtual port number found to 13228af548dcSInaky Perez-Gonzalez * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] 13238af548dcSInaky Perez-Gonzalez * and that becomes it's address [X < 128] or its unauthorized address 13248af548dcSInaky Perez-Gonzalez * [X | 0x80]. 13258af548dcSInaky Perez-Gonzalez * 13268af548dcSInaky Perez-Gonzalez * We add 1 as an offset to the one-based USB-stack port number 13278af548dcSInaky Perez-Gonzalez * (zero-based wusb virtual port index) for two reasons: (a) dev addr 13288af548dcSInaky Perez-Gonzalez * 0 is reserved by USB for default address; (b) Linux's USB stack 13298af548dcSInaky Perez-Gonzalez * uses always #1 for the root hub of the controller. So USB stack's 13308af548dcSInaky Perez-Gonzalez * port #1, which is wusb virtual-port #0 has address #2. 13318af548dcSInaky Perez-Gonzalez */ 13321da177e4SLinus Torvalds static void choose_address(struct usb_device *udev) 13331da177e4SLinus Torvalds { 13341da177e4SLinus Torvalds int devnum; 13351da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 13361da177e4SLinus Torvalds 13371da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 13388af548dcSInaky Perez-Gonzalez if (udev->wusb) { 13398af548dcSInaky Perez-Gonzalez devnum = udev->portnum + 1; 13408af548dcSInaky Perez-Gonzalez BUG_ON(test_bit(devnum, bus->devmap.devicemap)); 13418af548dcSInaky Perez-Gonzalez } else { 13428af548dcSInaky Perez-Gonzalez /* Try to allocate the next devnum beginning at 13438af548dcSInaky Perez-Gonzalez * bus->devnum_next. */ 13441da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 13451da177e4SLinus Torvalds bus->devnum_next); 13461da177e4SLinus Torvalds if (devnum >= 128) 13478af548dcSInaky Perez-Gonzalez devnum = find_next_zero_bit(bus->devmap.devicemap, 13488af548dcSInaky Perez-Gonzalez 128, 1); 13491da177e4SLinus Torvalds bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); 13508af548dcSInaky Perez-Gonzalez } 13511da177e4SLinus Torvalds if (devnum < 128) { 13521da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 13531da177e4SLinus Torvalds udev->devnum = devnum; 13541da177e4SLinus Torvalds } 13551da177e4SLinus Torvalds } 13561da177e4SLinus Torvalds 13571da177e4SLinus Torvalds static void release_address(struct usb_device *udev) 13581da177e4SLinus Torvalds { 13591da177e4SLinus Torvalds if (udev->devnum > 0) { 13601da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 13611da177e4SLinus Torvalds udev->devnum = -1; 13621da177e4SLinus Torvalds } 13631da177e4SLinus Torvalds } 13641da177e4SLinus Torvalds 13654953d141SDavid Vrabel static void update_address(struct usb_device *udev, int devnum) 13664953d141SDavid Vrabel { 13674953d141SDavid Vrabel /* The address for a WUSB device is managed by wusbcore. */ 13684953d141SDavid Vrabel if (!udev->wusb) 13694953d141SDavid Vrabel udev->devnum = devnum; 13704953d141SDavid Vrabel } 13714953d141SDavid Vrabel 1372d5d4db70SAlan Stern #ifdef CONFIG_USB_SUSPEND 1373d5d4db70SAlan Stern 1374d5d4db70SAlan Stern static void usb_stop_pm(struct usb_device *udev) 1375d5d4db70SAlan Stern { 1376d5d4db70SAlan Stern /* Synchronize with the ksuspend thread to prevent any more 1377d5d4db70SAlan Stern * autosuspend requests from being submitted, and decrement 1378d5d4db70SAlan Stern * the parent's count of unsuspended children. 1379d5d4db70SAlan Stern */ 1380d5d4db70SAlan Stern usb_pm_lock(udev); 1381d5d4db70SAlan Stern if (udev->parent && !udev->discon_suspended) 1382d5d4db70SAlan Stern usb_autosuspend_device(udev->parent); 1383d5d4db70SAlan Stern usb_pm_unlock(udev); 1384d5d4db70SAlan Stern 13859ac39f28SAlan Stern /* Stop any autosuspend or autoresume requests already submitted */ 13869ac39f28SAlan Stern cancel_delayed_work_sync(&udev->autosuspend); 13879ac39f28SAlan Stern cancel_work_sync(&udev->autoresume); 1388d5d4db70SAlan Stern } 1389d5d4db70SAlan Stern 1390d5d4db70SAlan Stern #else 1391d5d4db70SAlan Stern 1392d5d4db70SAlan Stern static inline void usb_stop_pm(struct usb_device *udev) 1393d5d4db70SAlan Stern { } 1394d5d4db70SAlan Stern 1395d5d4db70SAlan Stern #endif 1396d5d4db70SAlan Stern 13971da177e4SLinus Torvalds /** 13981da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 13991da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 14001da177e4SLinus Torvalds * Context: !in_interrupt () 14011da177e4SLinus Torvalds * 14021da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 14031da177e4SLinus Torvalds * 14041da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 14051da177e4SLinus Torvalds * If *pdev is a root hub then this routine will acquire the 14061da177e4SLinus Torvalds * usb_bus_list_lock on behalf of the caller. 14071da177e4SLinus Torvalds * 14081da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 14091da177e4SLinus Torvalds * controllers) should ever call this. 14101da177e4SLinus Torvalds * 14111da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 14121da177e4SLinus Torvalds */ 14131da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 14141da177e4SLinus Torvalds { 14151da177e4SLinus Torvalds struct usb_device *udev = *pdev; 14161da177e4SLinus Torvalds int i; 14171da177e4SLinus Torvalds 14181da177e4SLinus Torvalds if (!udev) { 1419441b62c1SHarvey Harrison pr_debug ("%s nodev\n", __func__); 14201da177e4SLinus Torvalds return; 14211da177e4SLinus Torvalds } 14221da177e4SLinus Torvalds 14231da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 14241da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 14251da177e4SLinus Torvalds * this quiesces everyting except pending urbs. 14261da177e4SLinus Torvalds */ 14271da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 14281da177e4SLinus Torvalds dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); 14291da177e4SLinus Torvalds 14309ad3d6ccSAlan Stern usb_lock_device(udev); 14319ad3d6ccSAlan Stern 14321da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 14331da177e4SLinus Torvalds for (i = 0; i < USB_MAXCHILDREN; i++) { 14341da177e4SLinus Torvalds if (udev->children[i]) 14351da177e4SLinus Torvalds usb_disconnect(&udev->children[i]); 14361da177e4SLinus Torvalds } 14371da177e4SLinus Torvalds 14381da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 14391da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 14401da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 14411da177e4SLinus Torvalds */ 1442782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 14431da177e4SLinus Torvalds usb_disable_device(udev, 0); 1444cde217a5SAlan Stern usb_hcd_synchronize_unlinks(udev); 14451da177e4SLinus Torvalds 14463b23dd6fSAlan Stern usb_remove_ep_devs(&udev->ep0); 1447782da727SAlan Stern usb_unlock_device(udev); 14483099e75aSGreg Kroah-Hartman 1449782da727SAlan Stern /* Unregister the device. The device driver is responsible 14503b23dd6fSAlan Stern * for de-configuring the device and invoking the remove-device 14513b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 1452782da727SAlan Stern */ 1453782da727SAlan Stern device_del(&udev->dev); 1454782da727SAlan Stern 1455782da727SAlan Stern /* Free the device number and delete the parent's children[] 14561da177e4SLinus Torvalds * (or root_hub) pointer. 14571da177e4SLinus Torvalds */ 14581da177e4SLinus Torvalds release_address(udev); 14591da177e4SLinus Torvalds 14601da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 14611da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 14621da177e4SLinus Torvalds *pdev = NULL; 14631da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 14641da177e4SLinus Torvalds 1465d5d4db70SAlan Stern usb_stop_pm(udev); 1466ee49fb5dSAlan Stern 1467782da727SAlan Stern put_device(&udev->dev); 14681da177e4SLinus Torvalds } 14691da177e4SLinus Torvalds 1470f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 14711da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 14721da177e4SLinus Torvalds { 14731da177e4SLinus Torvalds if (!string) 14741da177e4SLinus Torvalds return; 14751da177e4SLinus Torvalds dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); 14761da177e4SLinus Torvalds } 14771da177e4SLinus Torvalds 1478f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 1479f2a383e4SGreg Kroah-Hartman { 1480f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", 1481f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 1482f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idProduct)); 1483b9cef6c3SWu Fengguang dev_info(&udev->dev, 1484b9cef6c3SWu Fengguang "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", 1485f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 1486f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 1487f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 1488f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 1489f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 1490f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 1491f2a383e4SGreg Kroah-Hartman } 14921da177e4SLinus Torvalds #else 1493f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 14941da177e4SLinus Torvalds #endif 14951da177e4SLinus Torvalds 14961da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 14971da177e4SLinus Torvalds #include "otg_whitelist.h" 14981da177e4SLinus Torvalds #endif 14991da177e4SLinus Torvalds 15003ede760fSOliver Neukum /** 1501d9d16e8aSInaky Perez-Gonzalez * usb_configure_device_otg - FIXME (usbcore-internal) 15023ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 15033ede760fSOliver Neukum * 1504d9d16e8aSInaky Perez-Gonzalez * Do configuration for On-The-Go devices 15053ede760fSOliver Neukum */ 1506d9d16e8aSInaky Perez-Gonzalez static int usb_configure_device_otg(struct usb_device *udev) 15071da177e4SLinus Torvalds { 1508d9d16e8aSInaky Perez-Gonzalez int err = 0; 15091da177e4SLinus Torvalds 15101da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 15111da177e4SLinus Torvalds /* 15121da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 15131da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 15141da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 15151da177e4SLinus Torvalds */ 15161da177e4SLinus Torvalds if (!udev->bus->is_b_host 15171da177e4SLinus Torvalds && udev->config 15181da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 15191da177e4SLinus Torvalds struct usb_otg_descriptor *desc = 0; 15201da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 15211da177e4SLinus Torvalds 15221da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 15231da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 15241da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 15251da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 15261da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 152712c3da34SAlan Stern unsigned port1 = udev->portnum; 15281da177e4SLinus Torvalds 15291da177e4SLinus Torvalds dev_info(&udev->dev, 15301da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 15311da177e4SLinus Torvalds (port1 == bus->otg_port) 15321da177e4SLinus Torvalds ? "" : "non-"); 15331da177e4SLinus Torvalds 15341da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 15351da177e4SLinus Torvalds if (port1 == bus->otg_port) 15361da177e4SLinus Torvalds bus->b_hnp_enable = 1; 15371da177e4SLinus Torvalds err = usb_control_msg(udev, 15381da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 15391da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 15401da177e4SLinus Torvalds bus->b_hnp_enable 15411da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 15421da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 15431da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 15441da177e4SLinus Torvalds if (err < 0) { 15451da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 15461da177e4SLinus Torvalds * customize to match your product. 15471da177e4SLinus Torvalds */ 15481da177e4SLinus Torvalds dev_info(&udev->dev, 1549b9cef6c3SWu Fengguang "can't set HNP mode: %d\n", 15501da177e4SLinus Torvalds err); 15511da177e4SLinus Torvalds bus->b_hnp_enable = 0; 15521da177e4SLinus Torvalds } 15531da177e4SLinus Torvalds } 15541da177e4SLinus Torvalds } 15551da177e4SLinus Torvalds } 15561da177e4SLinus Torvalds 15571da177e4SLinus Torvalds if (!is_targeted(udev)) { 15581da177e4SLinus Torvalds 15591da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 15601da177e4SLinus Torvalds * (Includes HNP test device.) 15611da177e4SLinus Torvalds */ 15621da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 1563634a84f8SDavid Brownell err = usb_port_suspend(udev, PMSG_SUSPEND); 15641da177e4SLinus Torvalds if (err < 0) 15651da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 15661da177e4SLinus Torvalds } 1567ffcdc18dSVikram Pandita err = -ENOTSUPP; 15681da177e4SLinus Torvalds goto fail; 15691da177e4SLinus Torvalds } 1570d9d16e8aSInaky Perez-Gonzalez fail: 15711da177e4SLinus Torvalds #endif 1572d9d16e8aSInaky Perez-Gonzalez return err; 1573d9d16e8aSInaky Perez-Gonzalez } 15741da177e4SLinus Torvalds 1575d9d16e8aSInaky Perez-Gonzalez 1576d9d16e8aSInaky Perez-Gonzalez /** 1577d9d16e8aSInaky Perez-Gonzalez * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal) 1578d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 1579d9d16e8aSInaky Perez-Gonzalez * 1580d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 1581d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 1582d9d16e8aSInaky Perez-Gonzalez * environment. 1583d9d16e8aSInaky Perez-Gonzalez * 1584d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 1585d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 1586d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 1587d9d16e8aSInaky Perez-Gonzalez */ 1588d9d16e8aSInaky Perez-Gonzalez static int usb_configure_device(struct usb_device *udev) 1589d9d16e8aSInaky Perez-Gonzalez { 1590d9d16e8aSInaky Perez-Gonzalez int err; 1591d9d16e8aSInaky Perez-Gonzalez 1592d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 1593d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 1594d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 1595d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 1596d9d16e8aSInaky Perez-Gonzalez err); 1597d9d16e8aSInaky Perez-Gonzalez goto fail; 1598d9d16e8aSInaky Perez-Gonzalez } 1599d9d16e8aSInaky Perez-Gonzalez } 1600d9d16e8aSInaky Perez-Gonzalez if (udev->wusb == 1 && udev->authorized == 0) { 1601d9d16e8aSInaky Perez-Gonzalez udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1602d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1603d9d16e8aSInaky Perez-Gonzalez udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1604d9d16e8aSInaky Perez-Gonzalez } 1605d9d16e8aSInaky Perez-Gonzalez else { 1606d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 1607d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 1608d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 1609d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 1610d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 1611d9d16e8aSInaky Perez-Gonzalez } 1612d9d16e8aSInaky Perez-Gonzalez err = usb_configure_device_otg(udev); 1613d9d16e8aSInaky Perez-Gonzalez fail: 1614d9d16e8aSInaky Perez-Gonzalez return err; 1615d9d16e8aSInaky Perez-Gonzalez } 1616d9d16e8aSInaky Perez-Gonzalez 1617d9d16e8aSInaky Perez-Gonzalez 1618d9d16e8aSInaky Perez-Gonzalez /** 1619d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 1620d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 1621d9d16e8aSInaky Perez-Gonzalez * 1622d9d16e8aSInaky Perez-Gonzalez * This is called with devices which have been enumerated, but not yet 1623d9d16e8aSInaky Perez-Gonzalez * configured. The device descriptor is available, but not descriptors 1624d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 1625d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 1626d9d16e8aSInaky Perez-Gonzalez * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 1627d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 1628d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 1629d9d16e8aSInaky Perez-Gonzalez * 1630d9d16e8aSInaky Perez-Gonzalez * It will return if the device is configured properly or not. Zero if 1631d9d16e8aSInaky Perez-Gonzalez * the interface was registered with the driver core; else a negative 1632d9d16e8aSInaky Perez-Gonzalez * errno value. 1633d9d16e8aSInaky Perez-Gonzalez * 1634d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 1635d9d16e8aSInaky Perez-Gonzalez * 1636d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 1637d9d16e8aSInaky Perez-Gonzalez */ 1638d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 1639d9d16e8aSInaky Perez-Gonzalez { 1640d9d16e8aSInaky Perez-Gonzalez int err; 1641d9d16e8aSInaky Perez-Gonzalez 16426cd13201SAlan Stern /* Increment the parent's count of unsuspended children */ 16436cd13201SAlan Stern if (udev->parent) 16446cd13201SAlan Stern usb_autoresume_device(udev->parent); 16456cd13201SAlan Stern 1646d9d16e8aSInaky Perez-Gonzalez usb_detect_quirks(udev); /* Determine quirks */ 1647d9d16e8aSInaky Perez-Gonzalez err = usb_configure_device(udev); /* detect & probe dev/intfs */ 1648d9d16e8aSInaky Perez-Gonzalez if (err < 0) 1649d9d16e8aSInaky Perez-Gonzalez goto fail; 16509f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 16519f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 16529f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 16539f8b17e6SKay Sievers 16546cd13201SAlan Stern /* Tell the world! */ 16556cd13201SAlan Stern announce_device(udev); 1656195af2ccSAlan Stern 1657782da727SAlan Stern /* Register the device. The device driver is responsible 16583b23dd6fSAlan Stern * for configuring the device and invoking the add-device 16593b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 1660782da727SAlan Stern */ 16611da177e4SLinus Torvalds err = device_add(&udev->dev); 16621da177e4SLinus Torvalds if (err) { 16631da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 16641da177e4SLinus Torvalds goto fail; 16651da177e4SLinus Torvalds } 16669ad3d6ccSAlan Stern 16673b23dd6fSAlan Stern (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); 1668c066475eSGreg Kroah-Hartman return err; 16691da177e4SLinus Torvalds 16701da177e4SLinus Torvalds fail: 16711da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 16726cd13201SAlan Stern usb_stop_pm(udev); 1673d9d16e8aSInaky Perez-Gonzalez return err; 16741da177e4SLinus Torvalds } 16751da177e4SLinus Torvalds 167693993a0aSInaky Perez-Gonzalez 167793993a0aSInaky Perez-Gonzalez /** 1678fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 1679fd39c86bSRandy Dunlap * @usb_dev: USB device 1680fd39c86bSRandy Dunlap * 1681fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 1682fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 168393993a0aSInaky Perez-Gonzalez * 168493993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 168593993a0aSInaky Perez-Gonzalez * defer its call. 168693993a0aSInaky Perez-Gonzalez */ 168793993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 168893993a0aSInaky Perez-Gonzalez { 168993993a0aSInaky Perez-Gonzalez unsigned cnt; 169093993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 169193993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 169293993a0aSInaky Perez-Gonzalez goto out_unauthorized; 169393993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 169493993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 169593993a0aSInaky Perez-Gonzalez usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 169693993a0aSInaky Perez-Gonzalez usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 169793993a0aSInaky Perez-Gonzalez usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 169893993a0aSInaky Perez-Gonzalez kfree(usb_dev->config); 169993993a0aSInaky Perez-Gonzalez usb_dev->config = NULL; 170093993a0aSInaky Perez-Gonzalez for (cnt = 0; cnt < usb_dev->descriptor.bNumConfigurations; cnt++) 170193993a0aSInaky Perez-Gonzalez kfree(usb_dev->rawdescriptors[cnt]); 170293993a0aSInaky Perez-Gonzalez usb_dev->descriptor.bNumConfigurations = 0; 170393993a0aSInaky Perez-Gonzalez kfree(usb_dev->rawdescriptors); 170493993a0aSInaky Perez-Gonzalez out_unauthorized: 170593993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 170693993a0aSInaky Perez-Gonzalez return 0; 170793993a0aSInaky Perez-Gonzalez } 170893993a0aSInaky Perez-Gonzalez 170993993a0aSInaky Perez-Gonzalez 171093993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 171193993a0aSInaky Perez-Gonzalez { 171293993a0aSInaky Perez-Gonzalez int result = 0, c; 171393993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 171493993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 171593993a0aSInaky Perez-Gonzalez goto out_authorized; 171693993a0aSInaky Perez-Gonzalez kfree(usb_dev->product); 171793993a0aSInaky Perez-Gonzalez usb_dev->product = NULL; 171893993a0aSInaky Perez-Gonzalez kfree(usb_dev->manufacturer); 171993993a0aSInaky Perez-Gonzalez usb_dev->manufacturer = NULL; 172093993a0aSInaky Perez-Gonzalez kfree(usb_dev->serial); 172193993a0aSInaky Perez-Gonzalez usb_dev->serial = NULL; 172293993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 172393993a0aSInaky Perez-Gonzalez if (result < 0) { 172493993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 172593993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 172693993a0aSInaky Perez-Gonzalez goto error_autoresume; 172793993a0aSInaky Perez-Gonzalez } 172893993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 172993993a0aSInaky Perez-Gonzalez if (result < 0) { 173093993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 173193993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 173293993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 173393993a0aSInaky Perez-Gonzalez } 173493993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 173593993a0aSInaky Perez-Gonzalez result = usb_configure_device(usb_dev); 173693993a0aSInaky Perez-Gonzalez if (result < 0) 173793993a0aSInaky Perez-Gonzalez goto error_configure; 173893993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 173993993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 174093993a0aSInaky Perez-Gonzalez */ 1741b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 174293993a0aSInaky Perez-Gonzalez if (c >= 0) { 174393993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 174493993a0aSInaky Perez-Gonzalez if (result) { 174593993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 174693993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 174793993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 174893993a0aSInaky Perez-Gonzalez * set other configurations. */ 174993993a0aSInaky Perez-Gonzalez } 175093993a0aSInaky Perez-Gonzalez } 175193993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 175293993a0aSInaky Perez-Gonzalez error_configure: 175393993a0aSInaky Perez-Gonzalez error_device_descriptor: 175493993a0aSInaky Perez-Gonzalez error_autoresume: 175593993a0aSInaky Perez-Gonzalez out_authorized: 175693993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); // complements locktree 175793993a0aSInaky Perez-Gonzalez return result; 175893993a0aSInaky Perez-Gonzalez } 175993993a0aSInaky Perez-Gonzalez 176093993a0aSInaky Perez-Gonzalez 17610165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 17620165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 17630165de09SInaky Perez-Gonzalez { 17640165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 17650165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 17660165de09SInaky Perez-Gonzalez return 0; 17670165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 17680165de09SInaky Perez-Gonzalez return hcd->wireless; 17690165de09SInaky Perez-Gonzalez } 17700165de09SInaky Perez-Gonzalez 17710165de09SInaky Perez-Gonzalez 17721da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 17731da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 17741da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 17751da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 17761da177e4SLinus Torvalds #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) 17771da177e4SLinus Torvalds 17781da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 17791da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 17801da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 17811da177e4SLinus Torvalds #define HUB_RESET_TIMEOUT 500 17821da177e4SLinus Torvalds 17831da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 17841da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 17851da177e4SLinus Torvalds { 17861da177e4SLinus Torvalds int delay_time, ret; 17871da177e4SLinus Torvalds u16 portstatus; 17881da177e4SLinus Torvalds u16 portchange; 17891da177e4SLinus Torvalds 17901da177e4SLinus Torvalds for (delay_time = 0; 17911da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 17921da177e4SLinus Torvalds delay_time += delay) { 17931da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 17941da177e4SLinus Torvalds msleep(delay); 17951da177e4SLinus Torvalds 17961da177e4SLinus Torvalds /* read and decode port status */ 17971da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 17981da177e4SLinus Torvalds if (ret < 0) 17991da177e4SLinus Torvalds return ret; 18001da177e4SLinus Torvalds 18011da177e4SLinus Torvalds /* Device went away? */ 18021da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 18031da177e4SLinus Torvalds return -ENOTCONN; 18041da177e4SLinus Torvalds 1805dd4dd19eSAlan Stern /* bomb out completely if the connection bounced */ 18061da177e4SLinus Torvalds if ((portchange & USB_PORT_STAT_C_CONNECTION)) 1807dd4dd19eSAlan Stern return -ENOTCONN; 18081da177e4SLinus Torvalds 18091da177e4SLinus Torvalds /* if we`ve finished resetting, then break out of the loop */ 18101da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_RESET) && 18111da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_ENABLE)) { 18120165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 18130165de09SInaky Perez-Gonzalez udev->speed = USB_SPEED_VARIABLE; 18140165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 18151da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 18161da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 18171da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 18181da177e4SLinus Torvalds else 18191da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 18201da177e4SLinus Torvalds return 0; 18211da177e4SLinus Torvalds } 18221da177e4SLinus Torvalds 18231da177e4SLinus Torvalds /* switch to the long delay after two short delay failures */ 18241da177e4SLinus Torvalds if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 18251da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 18261da177e4SLinus Torvalds 18271da177e4SLinus Torvalds dev_dbg (hub->intfdev, 18281da177e4SLinus Torvalds "port %d not reset yet, waiting %dms\n", 18291da177e4SLinus Torvalds port1, delay); 18301da177e4SLinus Torvalds } 18311da177e4SLinus Torvalds 18321da177e4SLinus Torvalds return -EBUSY; 18331da177e4SLinus Torvalds } 18341da177e4SLinus Torvalds 18351da177e4SLinus Torvalds static int hub_port_reset(struct usb_hub *hub, int port1, 18361da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 18371da177e4SLinus Torvalds { 18381da177e4SLinus Torvalds int i, status; 18391da177e4SLinus Torvalds 184032fe0198SAlan Stern /* Block EHCI CF initialization during the port reset. 184132fe0198SAlan Stern * Some companion controllers don't like it when they mix. 184232fe0198SAlan Stern */ 184332fe0198SAlan Stern down_read(&ehci_cf_port_reset_rwsem); 184432fe0198SAlan Stern 18451da177e4SLinus Torvalds /* Reset the port */ 18461da177e4SLinus Torvalds for (i = 0; i < PORT_RESET_TRIES; i++) { 18471da177e4SLinus Torvalds status = set_port_feature(hub->hdev, 18481da177e4SLinus Torvalds port1, USB_PORT_FEAT_RESET); 18491da177e4SLinus Torvalds if (status) 18501da177e4SLinus Torvalds dev_err(hub->intfdev, 18511da177e4SLinus Torvalds "cannot reset port %d (err = %d)\n", 18521da177e4SLinus Torvalds port1, status); 18531da177e4SLinus Torvalds else { 18541da177e4SLinus Torvalds status = hub_port_wait_reset(hub, port1, udev, delay); 1855dd16525bSDavid Brownell if (status && status != -ENOTCONN) 18561da177e4SLinus Torvalds dev_dbg(hub->intfdev, 18571da177e4SLinus Torvalds "port_wait_reset: err = %d\n", 18581da177e4SLinus Torvalds status); 18591da177e4SLinus Torvalds } 18601da177e4SLinus Torvalds 18611da177e4SLinus Torvalds /* return on disconnect or reset */ 18621da177e4SLinus Torvalds switch (status) { 18631da177e4SLinus Torvalds case 0: 1864b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 1865b789696aSDavid Brownell msleep(10 + 40); 18664953d141SDavid Vrabel update_address(udev, 0); 18671da177e4SLinus Torvalds /* FALL THROUGH */ 18681da177e4SLinus Torvalds case -ENOTCONN: 18691da177e4SLinus Torvalds case -ENODEV: 18701da177e4SLinus Torvalds clear_port_feature(hub->hdev, 18711da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 18721da177e4SLinus Torvalds /* FIXME need disconnect() for NOTATTACHED device */ 18731da177e4SLinus Torvalds usb_set_device_state(udev, status 18741da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 18751da177e4SLinus Torvalds : USB_STATE_DEFAULT); 187632fe0198SAlan Stern goto done; 18771da177e4SLinus Torvalds } 18781da177e4SLinus Torvalds 18791da177e4SLinus Torvalds dev_dbg (hub->intfdev, 18801da177e4SLinus Torvalds "port %d not enabled, trying reset again...\n", 18811da177e4SLinus Torvalds port1); 18821da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 18831da177e4SLinus Torvalds } 18841da177e4SLinus Torvalds 18851da177e4SLinus Torvalds dev_err (hub->intfdev, 18861da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 18871da177e4SLinus Torvalds port1); 18881da177e4SLinus Torvalds 188932fe0198SAlan Stern done: 189032fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 18911da177e4SLinus Torvalds return status; 18921da177e4SLinus Torvalds } 18931da177e4SLinus Torvalds 1894d388dab7SAlan Stern #ifdef CONFIG_PM 18951da177e4SLinus Torvalds 1896b01b03f3SAlan Stern #define MASK_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | \ 1897b01b03f3SAlan Stern USB_PORT_STAT_SUSPEND) 1898b01b03f3SAlan Stern #define WANT_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION) 1899b01b03f3SAlan Stern 1900b01b03f3SAlan Stern /* Determine whether the device on a port is ready for a normal resume, 1901b01b03f3SAlan Stern * is ready for a reset-resume, or should be disconnected. 1902b01b03f3SAlan Stern */ 1903b01b03f3SAlan Stern static int check_port_resume_type(struct usb_device *udev, 1904b01b03f3SAlan Stern struct usb_hub *hub, int port1, 1905b01b03f3SAlan Stern int status, unsigned portchange, unsigned portstatus) 1906b01b03f3SAlan Stern { 1907b01b03f3SAlan Stern /* Is the device still present? */ 1908b01b03f3SAlan Stern if (status || (portstatus & MASK_BITS) != WANT_BITS) { 1909b01b03f3SAlan Stern if (status >= 0) 1910b01b03f3SAlan Stern status = -ENODEV; 1911b01b03f3SAlan Stern } 1912b01b03f3SAlan Stern 191386c57edfSAlan Stern /* Can't do a normal resume if the port isn't enabled, 191486c57edfSAlan Stern * so try a reset-resume instead. 191586c57edfSAlan Stern */ 191686c57edfSAlan Stern else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { 191786c57edfSAlan Stern if (udev->persist_enabled) 191886c57edfSAlan Stern udev->reset_resume = 1; 191986c57edfSAlan Stern else 1920b01b03f3SAlan Stern status = -ENODEV; 192186c57edfSAlan Stern } 1922b01b03f3SAlan Stern 1923b01b03f3SAlan Stern if (status) { 1924b01b03f3SAlan Stern dev_dbg(hub->intfdev, 1925b01b03f3SAlan Stern "port %d status %04x.%04x after resume, %d\n", 1926b01b03f3SAlan Stern port1, portchange, portstatus, status); 1927b01b03f3SAlan Stern } else if (udev->reset_resume) { 1928b01b03f3SAlan Stern 1929b01b03f3SAlan Stern /* Late port handoff can set status-change bits */ 1930b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) 1931b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 1932b01b03f3SAlan Stern USB_PORT_FEAT_C_CONNECTION); 1933b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) 1934b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 1935b01b03f3SAlan Stern USB_PORT_FEAT_C_ENABLE); 1936b01b03f3SAlan Stern } 1937b01b03f3SAlan Stern 1938b01b03f3SAlan Stern return status; 1939b01b03f3SAlan Stern } 1940b01b03f3SAlan Stern 19411da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 19421da177e4SLinus Torvalds 19431da177e4SLinus Torvalds /* 1944140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 1945624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 19465edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 19471da177e4SLinus Torvalds * 19481da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 19491da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 19501da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 1951140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 19521da177e4SLinus Torvalds * to disconnect devices while they are suspended. 19531da177e4SLinus Torvalds * 1954390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 1955390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 1956390a8c34SDavid Brownell * 1957624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 1958624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 1959624d6c07SAlan Stern * All devices below the suspended port are also suspended. 1960624d6c07SAlan Stern * 1961624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 1962624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 1963624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 1964624d6c07SAlan Stern * some cases, this wakes the USB host. 1965624d6c07SAlan Stern * 19661da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 19671da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 19681da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 19691da177e4SLinus Torvalds * 19704956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 19714956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 19724956eccdSAlan Stern * State transitions include: 19734956eccdSAlan Stern * 19744956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 19754956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 19764956eccdSAlan Stern * 19774956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 19784956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 19794956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 19804956eccdSAlan Stern * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 19814956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 19824956eccdSAlan Stern * 19834956eccdSAlan Stern * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when 19844956eccdSAlan Stern * the root hub for their bus goes into global suspend ... so we don't 19854956eccdSAlan Stern * (falsely) update the device power state to say it suspended. 19864956eccdSAlan Stern * 19871da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 19881da177e4SLinus Torvalds */ 198965bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 19901da177e4SLinus Torvalds { 1991624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 1992624d6c07SAlan Stern int port1 = udev->portnum; 1993624d6c07SAlan Stern int status; 19944956eccdSAlan Stern 1995624d6c07SAlan Stern // dev_dbg(hub->intfdev, "suspend port %d\n", port1); 1996624d6c07SAlan Stern 1997624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 1998624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 1999624d6c07SAlan Stern * 2000624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 2001624d6c07SAlan Stern * we don't explicitly enable it here. 2002624d6c07SAlan Stern */ 2003624d6c07SAlan Stern if (udev->do_remote_wakeup) { 2004624d6c07SAlan Stern status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2005624d6c07SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 2006624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 2007624d6c07SAlan Stern NULL, 0, 2008624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 2009624d6c07SAlan Stern if (status) 2010624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 2011624d6c07SAlan Stern status); 2012624d6c07SAlan Stern } 2013624d6c07SAlan Stern 2014624d6c07SAlan Stern /* see 7.1.7.6 */ 2015624d6c07SAlan Stern status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); 2016624d6c07SAlan Stern if (status) { 2017624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", 2018624d6c07SAlan Stern port1, status); 2019624d6c07SAlan Stern /* paranoia: "should not happen" */ 2020624d6c07SAlan Stern (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2021624d6c07SAlan Stern USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 2022624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 2023624d6c07SAlan Stern NULL, 0, 2024624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 2025624d6c07SAlan Stern } else { 2026624d6c07SAlan Stern /* device has up to 10 msec to fully suspend */ 2027624d6c07SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend\n", 202865bfd296SAlan Stern (msg.event & PM_EVENT_AUTO ? "auto-" : "")); 2029624d6c07SAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 2030624d6c07SAlan Stern msleep(10); 2031624d6c07SAlan Stern } 20324956eccdSAlan Stern return status; 20331da177e4SLinus Torvalds } 2034f3f3253dSDavid Brownell 20351da177e4SLinus Torvalds /* 2036390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 2037390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 203854515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 20391da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 20401da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 20411da177e4SLinus Torvalds * in the tree that's rooted at this device. 204254515fe5SAlan Stern * 204354515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 204454515fe5SAlan Stern * status check is done. 20451da177e4SLinus Torvalds */ 2046140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 20471da177e4SLinus Torvalds { 204854515fe5SAlan Stern int status = 0; 20491da177e4SLinus Torvalds u16 devstatus; 20501da177e4SLinus Torvalds 20511da177e4SLinus Torvalds /* caller owns the udev device lock */ 2052b9cef6c3SWu Fengguang dev_dbg(&udev->dev, "%s\n", 2053b9cef6c3SWu Fengguang udev->reset_resume ? "finish reset-resume" : "finish resume"); 20541da177e4SLinus Torvalds 20551da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 20561da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 20571da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 20581da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 20591da177e4SLinus Torvalds */ 20601da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 20611da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 20621da177e4SLinus Torvalds : USB_STATE_ADDRESS); 20631da177e4SLinus Torvalds 206454515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 206554515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 206654515fe5SAlan Stern * operation is carried out here, after the port has been 206754515fe5SAlan Stern * resumed. 206854515fe5SAlan Stern */ 206954515fe5SAlan Stern if (udev->reset_resume) 207086c57edfSAlan Stern retry_reset_resume: 2071742120c6SMing Lei status = usb_reset_and_verify_device(udev); 207254515fe5SAlan Stern 20731da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 20741da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 20751da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 20761da177e4SLinus Torvalds */ 207754515fe5SAlan Stern if (status == 0) { 207846dede46SAlan Stern devstatus = 0; 20791da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 2080b40b7a90SAlan Stern if (status >= 0) 208146dede46SAlan Stern status = (status > 0 ? 0 : -ENODEV); 208286c57edfSAlan Stern 208386c57edfSAlan Stern /* If a normal resume failed, try doing a reset-resume */ 208486c57edfSAlan Stern if (status && !udev->reset_resume && udev->persist_enabled) { 208586c57edfSAlan Stern dev_dbg(&udev->dev, "retry with reset-resume\n"); 208686c57edfSAlan Stern udev->reset_resume = 1; 208786c57edfSAlan Stern goto retry_reset_resume; 208886c57edfSAlan Stern } 208954515fe5SAlan Stern } 2090b40b7a90SAlan Stern 2091624d6c07SAlan Stern if (status) { 2092624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 20931da177e4SLinus Torvalds status); 2094624d6c07SAlan Stern } else if (udev->actconfig) { 20951da177e4SLinus Torvalds le16_to_cpus(&devstatus); 2096686314cfSAlan Stern if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { 20971da177e4SLinus Torvalds status = usb_control_msg(udev, 20981da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 20991da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, 21001da177e4SLinus Torvalds USB_RECIP_DEVICE, 21011da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 21021da177e4SLinus Torvalds NULL, 0, 21031da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 2104a8e7c565SAlan Stern if (status) 2105b9cef6c3SWu Fengguang dev_dbg(&udev->dev, 2106b9cef6c3SWu Fengguang "disable remote wakeup, status %d\n", 2107b9cef6c3SWu Fengguang status); 21084bf0ba86SAlan Stern } 21091da177e4SLinus Torvalds status = 0; 21101da177e4SLinus Torvalds } 21111da177e4SLinus Torvalds return status; 21121da177e4SLinus Torvalds } 21131da177e4SLinus Torvalds 2114624d6c07SAlan Stern /* 2115624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 2116624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 2117624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 2118624d6c07SAlan Stern * 2119624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 2120624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 2121624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 2122624d6c07SAlan Stern * the host and the device is the same as it was when the device 2123624d6c07SAlan Stern * suspended. 2124624d6c07SAlan Stern * 2125feccc30dSAlan Stern * If @udev->reset_resume is set then this routine won't check that the 2126feccc30dSAlan Stern * port is still enabled. Furthermore, finish_port_resume() above will 212754515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 212854515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 212954515fe5SAlan Stern * 213054515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 213154515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 213254515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 213354515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 213454515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 213554515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 213654515fe5SAlan Stern * made to appear as if it had not disconnected. 213754515fe5SAlan Stern * 2138742120c6SMing Lei * This facility can be dangerous. Although usb_reset_and_verify_device() makes 2139feccc30dSAlan Stern * every effort to insure that the same device is present after the 214054515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 214154515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 214254515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 214354515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 214454515fe5SAlan Stern * new card is corrupted and the system crashes. 214554515fe5SAlan Stern * 2146624d6c07SAlan Stern * Returns 0 on success, else negative errno. 2147624d6c07SAlan Stern */ 214865bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 21491da177e4SLinus Torvalds { 2150624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2151624d6c07SAlan Stern int port1 = udev->portnum; 21521da177e4SLinus Torvalds int status; 2153d25450c6SAlan Stern u16 portchange, portstatus; 2154d25450c6SAlan Stern 2155d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 2156d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 2157d25450c6SAlan Stern if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND)) 2158d25450c6SAlan Stern goto SuspendCleared; 21591da177e4SLinus Torvalds 21601da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "resume port %d\n", port1); 21611da177e4SLinus Torvalds 2162d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 2163d5cbad4bSAlan Stern 21641da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 21651da177e4SLinus Torvalds status = clear_port_feature(hub->hdev, 21661da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 21671da177e4SLinus Torvalds if (status) { 2168624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", 21691da177e4SLinus Torvalds port1, status); 21701da177e4SLinus Torvalds } else { 21711da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 2172645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 217365bfd296SAlan Stern (msg.event & PM_EVENT_AUTO ? "auto-" : "")); 21741da177e4SLinus Torvalds msleep(25); 21751da177e4SLinus Torvalds 21761da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 21771da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 21781da177e4SLinus Torvalds * sequence. 21791da177e4SLinus Torvalds */ 2180d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 218154515fe5SAlan Stern 21821da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 21831da177e4SLinus Torvalds msleep(10); 21841da177e4SLinus Torvalds } 2185b01b03f3SAlan Stern 2186b01b03f3SAlan Stern SuspendCleared: 2187b01b03f3SAlan Stern if (status == 0) { 2188b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 2189b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2190b01b03f3SAlan Stern USB_PORT_FEAT_C_SUSPEND); 21911da177e4SLinus Torvalds } 21921da177e4SLinus Torvalds 2193d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 2194d5cbad4bSAlan Stern 2195b01b03f3SAlan Stern status = check_port_resume_type(udev, 2196b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 219754515fe5SAlan Stern if (status == 0) 219854515fe5SAlan Stern status = finish_port_resume(udev); 219954515fe5SAlan Stern if (status < 0) { 220054515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 220154515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 220254515fe5SAlan Stern } 22031da177e4SLinus Torvalds return status; 22041da177e4SLinus Torvalds } 22051da177e4SLinus Torvalds 22068808f00cSAlan Stern /* caller has locked udev */ 22071da177e4SLinus Torvalds static int remote_wakeup(struct usb_device *udev) 22081da177e4SLinus Torvalds { 22091da177e4SLinus Torvalds int status = 0; 22101da177e4SLinus Torvalds 22111da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 2212645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 22131941044aSAlan Stern usb_mark_last_busy(udev); 221465bfd296SAlan Stern status = usb_external_resume_device(udev, PMSG_REMOTE_RESUME); 2215d25450c6SAlan Stern } 22161da177e4SLinus Torvalds return status; 22171da177e4SLinus Torvalds } 22181da177e4SLinus Torvalds 2219d388dab7SAlan Stern #else /* CONFIG_USB_SUSPEND */ 2220d388dab7SAlan Stern 2221d388dab7SAlan Stern /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ 2222d388dab7SAlan Stern 222365bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 2224d388dab7SAlan Stern { 2225d388dab7SAlan Stern return 0; 2226d388dab7SAlan Stern } 2227d388dab7SAlan Stern 2228b01b03f3SAlan Stern /* However we may need to do a reset-resume */ 2229b01b03f3SAlan Stern 223065bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 2231d388dab7SAlan Stern { 2232b01b03f3SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2233b01b03f3SAlan Stern int port1 = udev->portnum; 2234b01b03f3SAlan Stern int status; 2235b01b03f3SAlan Stern u16 portchange, portstatus; 223654515fe5SAlan Stern 2237b01b03f3SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 2238b01b03f3SAlan Stern status = check_port_resume_type(udev, 2239b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 2240b01b03f3SAlan Stern 2241b01b03f3SAlan Stern if (status) { 2242b01b03f3SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 2243b01b03f3SAlan Stern hub_port_logical_disconnect(hub, port1); 2244b01b03f3SAlan Stern } else if (udev->reset_resume) { 224554515fe5SAlan Stern dev_dbg(&udev->dev, "reset-resume\n"); 2246742120c6SMing Lei status = usb_reset_and_verify_device(udev); 224754515fe5SAlan Stern } 224854515fe5SAlan Stern return status; 2249d388dab7SAlan Stern } 2250d388dab7SAlan Stern 2251d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 2252d388dab7SAlan Stern { 2253d388dab7SAlan Stern return 0; 2254d388dab7SAlan Stern } 2255d388dab7SAlan Stern 2256d388dab7SAlan Stern #endif 2257d388dab7SAlan Stern 2258db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 22591da177e4SLinus Torvalds { 22601da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 22611da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 22621da177e4SLinus Torvalds unsigned port1; 22631da177e4SLinus Torvalds 2264c9f89fa4SDavid Brownell /* fail if children aren't already suspended */ 22651da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 22661da177e4SLinus Torvalds struct usb_device *udev; 22671da177e4SLinus Torvalds 22681da177e4SLinus Torvalds udev = hdev->children [port1-1]; 22696840d255SAlan Stern if (udev && udev->can_submit) { 227065bfd296SAlan Stern if (!(msg.event & PM_EVENT_AUTO)) 2271645daaabSAlan Stern dev_dbg(&intf->dev, "port %d nyet suspended\n", 2272645daaabSAlan Stern port1); 2273c9f89fa4SDavid Brownell return -EBUSY; 2274c9f89fa4SDavid Brownell } 22751da177e4SLinus Torvalds } 22761da177e4SLinus Torvalds 2277441b62c1SHarvey Harrison dev_dbg(&intf->dev, "%s\n", __func__); 227840f122f3SAlan Stern 2279c9f89fa4SDavid Brownell /* stop khubd and related activity */ 22804330354fSAlan Stern hub_quiesce(hub, HUB_SUSPEND); 2281b6f6436dSAlan Stern return 0; 22821da177e4SLinus Torvalds } 22831da177e4SLinus Torvalds 22841da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 22851da177e4SLinus Torvalds { 22861da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 22871da177e4SLinus Torvalds 22885e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 2289f2835219SAlan Stern hub_activate(hub, HUB_RESUME); 22901da177e4SLinus Torvalds return 0; 22911da177e4SLinus Torvalds } 22921da177e4SLinus Torvalds 2293b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 2294f07600cfSAlan Stern { 2295b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 2296f07600cfSAlan Stern 22975e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 2298f2835219SAlan Stern hub_activate(hub, HUB_RESET_RESUME); 2299f07600cfSAlan Stern return 0; 2300f07600cfSAlan Stern } 2301f07600cfSAlan Stern 230254515fe5SAlan Stern /** 230354515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 230454515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 230554515fe5SAlan Stern * 230654515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 230754515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 2308feccc30dSAlan Stern * has been reset. The routine marks @rhdev as having lost power. 2309feccc30dSAlan Stern * When the hub driver is resumed it will take notice and carry out 2310feccc30dSAlan Stern * power-session recovery for all the "USB-PERSIST"-enabled child devices; 2311feccc30dSAlan Stern * the others will be disconnected. 231254515fe5SAlan Stern */ 231354515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 231454515fe5SAlan Stern { 231554515fe5SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 231654515fe5SAlan Stern rhdev->reset_resume = 1; 231754515fe5SAlan Stern } 231854515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 231954515fe5SAlan Stern 2320d388dab7SAlan Stern #else /* CONFIG_PM */ 2321d388dab7SAlan Stern 2322d388dab7SAlan Stern static inline int remote_wakeup(struct usb_device *udev) 2323d388dab7SAlan Stern { 2324d388dab7SAlan Stern return 0; 2325d388dab7SAlan Stern } 2326d388dab7SAlan Stern 2327511366daSAndrew Morton #define hub_suspend NULL 2328511366daSAndrew Morton #define hub_resume NULL 2329f07600cfSAlan Stern #define hub_reset_resume NULL 2330d388dab7SAlan Stern #endif 2331d388dab7SAlan Stern 23321da177e4SLinus Torvalds 23331da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 23341da177e4SLinus Torvalds * 23351da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 23361da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 23371da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 23381da177e4SLinus Torvalds * 23391da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 23401da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 23411da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 23421da177e4SLinus Torvalds * 23431da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 23441da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 23451da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 23461da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 23471da177e4SLinus Torvalds */ 23481da177e4SLinus Torvalds static int hub_port_debounce(struct usb_hub *hub, int port1) 23491da177e4SLinus Torvalds { 23501da177e4SLinus Torvalds int ret; 23511da177e4SLinus Torvalds int total_time, stable_time = 0; 23521da177e4SLinus Torvalds u16 portchange, portstatus; 23531da177e4SLinus Torvalds unsigned connection = 0xffff; 23541da177e4SLinus Torvalds 23551da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 23561da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 23571da177e4SLinus Torvalds if (ret < 0) 23581da177e4SLinus Torvalds return ret; 23591da177e4SLinus Torvalds 23601da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 23611da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 23621da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 23631da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 23641da177e4SLinus Torvalds break; 23651da177e4SLinus Torvalds } else { 23661da177e4SLinus Torvalds stable_time = 0; 23671da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 23681da177e4SLinus Torvalds } 23691da177e4SLinus Torvalds 23701da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 23711da177e4SLinus Torvalds clear_port_feature(hub->hdev, port1, 23721da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 23731da177e4SLinus Torvalds } 23741da177e4SLinus Torvalds 23751da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 23761da177e4SLinus Torvalds break; 23771da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 23781da177e4SLinus Torvalds } 23791da177e4SLinus Torvalds 23801da177e4SLinus Torvalds dev_dbg (hub->intfdev, 23811da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 23821da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 23831da177e4SLinus Torvalds 23841da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 23851da177e4SLinus Torvalds return -ETIMEDOUT; 23861da177e4SLinus Torvalds return portstatus; 23871da177e4SLinus Torvalds } 23881da177e4SLinus Torvalds 2389fc721f51SInaky Perez-Gonzalez void usb_ep0_reinit(struct usb_device *udev) 23901da177e4SLinus Torvalds { 2391ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); 2392ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); 23932caf7fcdSAlan Stern usb_enable_endpoint(udev, &udev->ep0, true); 23941da177e4SLinus Torvalds } 2395fc721f51SInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_ep0_reinit); 23961da177e4SLinus Torvalds 23971da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 23981da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 23991da177e4SLinus Torvalds 24004326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 24011da177e4SLinus Torvalds { 24021da177e4SLinus Torvalds int retval; 24031da177e4SLinus Torvalds 24044326ed0bSAlan Stern if (devnum <= 1) 24051da177e4SLinus Torvalds return -EINVAL; 24061da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 24071da177e4SLinus Torvalds return 0; 24081da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 24091da177e4SLinus Torvalds return -EINVAL; 24101da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 24114326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 24121da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 24131da177e4SLinus Torvalds if (retval == 0) { 24144953d141SDavid Vrabel /* Device now using proper address. */ 24154953d141SDavid Vrabel update_address(udev, devnum); 24161da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 2417fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 24181da177e4SLinus Torvalds } 24191da177e4SLinus Torvalds return retval; 24201da177e4SLinus Torvalds } 24211da177e4SLinus Torvalds 24221da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 24231da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 24241da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 24251da177e4SLinus Torvalds * 24261da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 2427742120c6SMing Lei * usb_reset_and_verify_device), the caller must own the device lock. For a 24281da177e4SLinus Torvalds * newly detected device that is not accessible through any global 24291da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 24301da177e4SLinus Torvalds */ 24311da177e4SLinus Torvalds static int 24321da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 24331da177e4SLinus Torvalds int retry_counter) 24341da177e4SLinus Torvalds { 24354186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 24361da177e4SLinus Torvalds 24371da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 24381da177e4SLinus Torvalds int i, j, retval; 24391da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 24401da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 244183a07196SInaky Perez-Gonzalez char *speed, *type; 24424326ed0bSAlan Stern int devnum = udev->devnum; 24431da177e4SLinus Torvalds 24441da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 24451da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 24461da177e4SLinus Torvalds */ 24471da177e4SLinus Torvalds if (!hdev->parent) { 24481da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 24491da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 24501da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 24511da177e4SLinus Torvalds } 24521da177e4SLinus Torvalds 24531da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 24541da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 24551da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 24561da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 24571da177e4SLinus Torvalds 24584186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 24591da177e4SLinus Torvalds 24601da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 24611da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 24621da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 24631da177e4SLinus Torvalds goto fail; 24641da177e4SLinus Torvalds /* success, speed is known */ 24651da177e4SLinus Torvalds retval = -ENODEV; 24661da177e4SLinus Torvalds 24671da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 24681da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 24691da177e4SLinus Torvalds goto fail; 24701da177e4SLinus Torvalds } 24711da177e4SLinus Torvalds oldspeed = udev->speed; 24721da177e4SLinus Torvalds 24731da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 24741da177e4SLinus Torvalds * it's fixed size except for full speed devices. 24755bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 24765bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 24771da177e4SLinus Torvalds */ 24781da177e4SLinus Torvalds switch (udev->speed) { 24796b403b02SSarah Sharp case USB_SPEED_SUPER: 24805bb6e0aeSInaky Perez-Gonzalez case USB_SPEED_VARIABLE: /* fixed at 512 */ 2481551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); 24825bb6e0aeSInaky Perez-Gonzalez break; 24831da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 2484551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 24851da177e4SLinus Torvalds break; 24861da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 24871da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 24881da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 24891da177e4SLinus Torvalds * then correct our initial guess. 24901da177e4SLinus Torvalds */ 2491551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 24921da177e4SLinus Torvalds break; 24931da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 2494551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); 24951da177e4SLinus Torvalds break; 24961da177e4SLinus Torvalds default: 24971da177e4SLinus Torvalds goto fail; 24981da177e4SLinus Torvalds } 24991da177e4SLinus Torvalds 250083a07196SInaky Perez-Gonzalez type = ""; 250183a07196SInaky Perez-Gonzalez switch (udev->speed) { 25021da177e4SLinus Torvalds case USB_SPEED_LOW: speed = "low"; break; 25031da177e4SLinus Torvalds case USB_SPEED_FULL: speed = "full"; break; 25041da177e4SLinus Torvalds case USB_SPEED_HIGH: speed = "high"; break; 25056b403b02SSarah Sharp case USB_SPEED_SUPER: 25066b403b02SSarah Sharp speed = "super"; 25076b403b02SSarah Sharp break; 250883a07196SInaky Perez-Gonzalez case USB_SPEED_VARIABLE: 250983a07196SInaky Perez-Gonzalez speed = "variable"; 251083a07196SInaky Perez-Gonzalez type = "Wireless "; 251183a07196SInaky Perez-Gonzalez break; 25121da177e4SLinus Torvalds default: speed = "?"; break; 251383a07196SInaky Perez-Gonzalez } 251483a07196SInaky Perez-Gonzalez dev_info (&udev->dev, 251583a07196SInaky Perez-Gonzalez "%s %s speed %sUSB device using %s and address %d\n", 251683a07196SInaky Perez-Gonzalez (udev->config) ? "reset" : "new", speed, type, 25174326ed0bSAlan Stern udev->bus->controller->driver->name, devnum); 25181da177e4SLinus Torvalds 25191da177e4SLinus Torvalds /* Set up TT records, if needed */ 25201da177e4SLinus Torvalds if (hdev->tt) { 25211da177e4SLinus Torvalds udev->tt = hdev->tt; 25221da177e4SLinus Torvalds udev->ttport = hdev->ttport; 25231da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 25241da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 25251da177e4SLinus Torvalds udev->tt = &hub->tt; 25261da177e4SLinus Torvalds udev->ttport = port1; 25271da177e4SLinus Torvalds } 25281da177e4SLinus Torvalds 25291da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 25301da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 25311da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 25321da177e4SLinus Torvalds * Change it cautiously. 25331da177e4SLinus Torvalds * 25341da177e4SLinus Torvalds * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 25351da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 25361da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 25371da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 25381da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 25391da177e4SLinus Torvalds * value. 25401da177e4SLinus Torvalds */ 25411da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 25421da177e4SLinus Torvalds if (USE_NEW_SCHEME(retry_counter)) { 25431da177e4SLinus Torvalds struct usb_device_descriptor *buf; 25441da177e4SLinus Torvalds int r = 0; 25451da177e4SLinus Torvalds 25461da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 25471da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 25481da177e4SLinus Torvalds if (!buf) { 25491da177e4SLinus Torvalds retval = -ENOMEM; 25501da177e4SLinus Torvalds continue; 25511da177e4SLinus Torvalds } 25521da177e4SLinus Torvalds 2553b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 2554b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 2555b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 25561da177e4SLinus Torvalds */ 25571da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 25581da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 25591da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 25601da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 25611da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 25621da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 2563fd7c519dSJaroslav Kysela initial_descriptor_timeout); 25641da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 25655bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 25661da177e4SLinus Torvalds if (buf->bDescriptorType == 25671da177e4SLinus Torvalds USB_DT_DEVICE) { 25681da177e4SLinus Torvalds r = 0; 25691da177e4SLinus Torvalds break; 25701da177e4SLinus Torvalds } 25711da177e4SLinus Torvalds /* FALL THROUGH */ 25721da177e4SLinus Torvalds default: 25731da177e4SLinus Torvalds if (r == 0) 25741da177e4SLinus Torvalds r = -EPROTO; 25751da177e4SLinus Torvalds break; 25761da177e4SLinus Torvalds } 25771da177e4SLinus Torvalds if (r == 0) 25781da177e4SLinus Torvalds break; 25791da177e4SLinus Torvalds } 25801da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 25811da177e4SLinus Torvalds buf->bMaxPacketSize0; 25821da177e4SLinus Torvalds kfree(buf); 25831da177e4SLinus Torvalds 25841da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 25851da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 25861da177e4SLinus Torvalds goto fail; 25871da177e4SLinus Torvalds if (oldspeed != udev->speed) { 25881da177e4SLinus Torvalds dev_dbg(&udev->dev, 25891da177e4SLinus Torvalds "device reset changed speed!\n"); 25901da177e4SLinus Torvalds retval = -ENODEV; 25911da177e4SLinus Torvalds goto fail; 25921da177e4SLinus Torvalds } 25931da177e4SLinus Torvalds if (r) { 2594b9cef6c3SWu Fengguang dev_err(&udev->dev, 2595b9cef6c3SWu Fengguang "device descriptor read/64, error %d\n", 2596b9cef6c3SWu Fengguang r); 25971da177e4SLinus Torvalds retval = -EMSGSIZE; 25981da177e4SLinus Torvalds continue; 25991da177e4SLinus Torvalds } 26001da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 26011da177e4SLinus Torvalds } 26021da177e4SLinus Torvalds 26036c529cdcSInaky Perez-Gonzalez /* 26046c529cdcSInaky Perez-Gonzalez * If device is WUSB, we already assigned an 26056c529cdcSInaky Perez-Gonzalez * unauthorized address in the Connect Ack sequence; 26066c529cdcSInaky Perez-Gonzalez * authorization will assign the final address. 26076c529cdcSInaky Perez-Gonzalez */ 26086c529cdcSInaky Perez-Gonzalez if (udev->wusb == 0) { 26091da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 26104326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 26111da177e4SLinus Torvalds if (retval >= 0) 26121da177e4SLinus Torvalds break; 26131da177e4SLinus Torvalds msleep(200); 26141da177e4SLinus Torvalds } 26151da177e4SLinus Torvalds if (retval < 0) { 26161da177e4SLinus Torvalds dev_err(&udev->dev, 26171da177e4SLinus Torvalds "device not accepting address %d, error %d\n", 26184326ed0bSAlan Stern devnum, retval); 26191da177e4SLinus Torvalds goto fail; 26201da177e4SLinus Torvalds } 26211da177e4SLinus Torvalds 26221da177e4SLinus Torvalds /* cope with hardware quirkiness: 26231da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 26241da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 26251da177e4SLinus Torvalds */ 26261da177e4SLinus Torvalds msleep(10); 26271da177e4SLinus Torvalds if (USE_NEW_SCHEME(retry_counter)) 26281da177e4SLinus Torvalds break; 26296c529cdcSInaky Perez-Gonzalez } 26301da177e4SLinus Torvalds 26311da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 26321da177e4SLinus Torvalds if (retval < 8) { 2633b9cef6c3SWu Fengguang dev_err(&udev->dev, 2634b9cef6c3SWu Fengguang "device descriptor read/8, error %d\n", 2635b9cef6c3SWu Fengguang retval); 26361da177e4SLinus Torvalds if (retval >= 0) 26371da177e4SLinus Torvalds retval = -EMSGSIZE; 26381da177e4SLinus Torvalds } else { 26391da177e4SLinus Torvalds retval = 0; 26401da177e4SLinus Torvalds break; 26411da177e4SLinus Torvalds } 26421da177e4SLinus Torvalds } 26431da177e4SLinus Torvalds if (retval) 26441da177e4SLinus Torvalds goto fail; 26451da177e4SLinus Torvalds 26466b403b02SSarah Sharp if (udev->descriptor.bMaxPacketSize0 == 0xff || 26476b403b02SSarah Sharp udev->speed == USB_SPEED_SUPER) 26486b403b02SSarah Sharp i = 512; 26496b403b02SSarah Sharp else 26506b403b02SSarah Sharp i = udev->descriptor.bMaxPacketSize0; 26511da177e4SLinus Torvalds if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { 26521da177e4SLinus Torvalds if (udev->speed != USB_SPEED_FULL || 26531da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 26541da177e4SLinus Torvalds dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); 26551da177e4SLinus Torvalds retval = -EMSGSIZE; 26561da177e4SLinus Torvalds goto fail; 26571da177e4SLinus Torvalds } 26581da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 26591da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 2660fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 26611da177e4SLinus Torvalds } 26621da177e4SLinus Torvalds 26631da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 26641da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 2665b9cef6c3SWu Fengguang dev_err(&udev->dev, "device descriptor read/all, error %d\n", 2666b9cef6c3SWu Fengguang retval); 26671da177e4SLinus Torvalds if (retval >= 0) 26681da177e4SLinus Torvalds retval = -ENOMSG; 26691da177e4SLinus Torvalds goto fail; 26701da177e4SLinus Torvalds } 26711da177e4SLinus Torvalds 26721da177e4SLinus Torvalds retval = 0; 26731da177e4SLinus Torvalds 26741da177e4SLinus Torvalds fail: 26754326ed0bSAlan Stern if (retval) { 26761da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 26774953d141SDavid Vrabel update_address(udev, devnum); /* for disconnect processing */ 26784326ed0bSAlan Stern } 26794186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 26801da177e4SLinus Torvalds return retval; 26811da177e4SLinus Torvalds } 26821da177e4SLinus Torvalds 26831da177e4SLinus Torvalds static void 26841da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 26851da177e4SLinus Torvalds { 26861da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 26871da177e4SLinus Torvalds int status; 26881da177e4SLinus Torvalds 2689e94b1766SChristoph Lameter qual = kmalloc (sizeof *qual, GFP_KERNEL); 26901da177e4SLinus Torvalds if (qual == NULL) 26911da177e4SLinus Torvalds return; 26921da177e4SLinus Torvalds 26931da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 26941da177e4SLinus Torvalds qual, sizeof *qual); 26951da177e4SLinus Torvalds if (status == sizeof *qual) { 26961da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 26971da177e4SLinus Torvalds "connect to a high speed hub\n"); 26981da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 26991da177e4SLinus Torvalds if (hub->has_indicators) { 27001da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 2701c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 27021da177e4SLinus Torvalds } 27031da177e4SLinus Torvalds } 27041da177e4SLinus Torvalds kfree(qual); 27051da177e4SLinus Torvalds } 27061da177e4SLinus Torvalds 27071da177e4SLinus Torvalds static unsigned 27081da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 27091da177e4SLinus Torvalds { 27101da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 27111da177e4SLinus Torvalds int remaining; 271255c52718SAlan Stern int port1; 27131da177e4SLinus Torvalds 271455c52718SAlan Stern if (!hub->limited_power) 27151da177e4SLinus Torvalds return 0; 27161da177e4SLinus Torvalds 271755c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 271855c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 271955c52718SAlan Stern struct usb_device *udev = hdev->children[port1 - 1]; 272055c52718SAlan Stern int delta; 27211da177e4SLinus Torvalds 27221da177e4SLinus Torvalds if (!udev) 27231da177e4SLinus Torvalds continue; 27241da177e4SLinus Torvalds 272555c52718SAlan Stern /* Unconfigured devices may not use more than 100mA, 272655c52718SAlan Stern * or 8mA for OTG ports */ 27271da177e4SLinus Torvalds if (udev->actconfig) 272855c52718SAlan Stern delta = udev->actconfig->desc.bMaxPower * 2; 272955c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 273055c52718SAlan Stern delta = 100; 27311da177e4SLinus Torvalds else 273255c52718SAlan Stern delta = 8; 273355c52718SAlan Stern if (delta > hub->mA_per_port) 2734b9cef6c3SWu Fengguang dev_warn(&udev->dev, 2735b9cef6c3SWu Fengguang "%dmA is over %umA budget for port %d!\n", 273655c52718SAlan Stern delta, hub->mA_per_port, port1); 27371da177e4SLinus Torvalds remaining -= delta; 27381da177e4SLinus Torvalds } 27391da177e4SLinus Torvalds if (remaining < 0) { 274055c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 274155c52718SAlan Stern - remaining); 27421da177e4SLinus Torvalds remaining = 0; 27431da177e4SLinus Torvalds } 27441da177e4SLinus Torvalds return remaining; 27451da177e4SLinus Torvalds } 27461da177e4SLinus Torvalds 27471da177e4SLinus Torvalds /* Handle physical or logical connection change events. 27481da177e4SLinus Torvalds * This routine is called when: 27491da177e4SLinus Torvalds * a port connection-change occurs; 27501da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 2751742120c6SMing Lei * usb_reset_and_verify_device() encounters changed descriptors (as from 27521da177e4SLinus Torvalds * a firmware download) 27531da177e4SLinus Torvalds * caller already locked the hub 27541da177e4SLinus Torvalds */ 27551da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 27561da177e4SLinus Torvalds u16 portstatus, u16 portchange) 27571da177e4SLinus Torvalds { 27581da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 27591da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 276090da096eSBalaji Rao struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 276124618b0cSAlan Stern unsigned wHubCharacteristics = 276224618b0cSAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 27638808f00cSAlan Stern struct usb_device *udev; 27641da177e4SLinus Torvalds int status, i; 27651da177e4SLinus Torvalds 27661da177e4SLinus Torvalds dev_dbg (hub_dev, 27671da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 27681da177e4SLinus Torvalds port1, portstatus, portchange, portspeed (portstatus)); 27691da177e4SLinus Torvalds 27701da177e4SLinus Torvalds if (hub->has_indicators) { 27711da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 27721da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 27731da177e4SLinus Torvalds } 27741da177e4SLinus Torvalds 27751da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 27761da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 27771da177e4SLinus Torvalds if (hdev->bus->is_b_host) 277824618b0cSAlan Stern portchange &= ~(USB_PORT_STAT_C_CONNECTION | 277924618b0cSAlan Stern USB_PORT_STAT_C_ENABLE); 27801da177e4SLinus Torvalds #endif 27811da177e4SLinus Torvalds 27828808f00cSAlan Stern /* Try to resuscitate an existing device */ 27838808f00cSAlan Stern udev = hdev->children[port1-1]; 27848808f00cSAlan Stern if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && 27858808f00cSAlan Stern udev->state != USB_STATE_NOTATTACHED) { 27868808f00cSAlan Stern usb_lock_device(udev); 27878808f00cSAlan Stern if (portstatus & USB_PORT_STAT_ENABLE) { 27888808f00cSAlan Stern status = 0; /* Nothing to do */ 27898808f00cSAlan Stern 27908808f00cSAlan Stern #ifdef CONFIG_USB_SUSPEND 27915257d97aSAlan Stern } else if (udev->state == USB_STATE_SUSPENDED && 27925257d97aSAlan Stern udev->persist_enabled) { 27938808f00cSAlan Stern /* For a suspended device, treat this as a 27948808f00cSAlan Stern * remote wakeup event. 27958808f00cSAlan Stern */ 27968808f00cSAlan Stern if (udev->do_remote_wakeup) 27978808f00cSAlan Stern status = remote_wakeup(udev); 27988808f00cSAlan Stern 27998808f00cSAlan Stern /* Otherwise leave it be; devices can't tell the 28008808f00cSAlan Stern * difference between suspended and disabled. 28018808f00cSAlan Stern */ 28028808f00cSAlan Stern else 28038808f00cSAlan Stern status = 0; 28048808f00cSAlan Stern #endif 28058808f00cSAlan Stern 28068808f00cSAlan Stern } else { 28075257d97aSAlan Stern status = -ENODEV; /* Don't resuscitate */ 28088808f00cSAlan Stern } 28098808f00cSAlan Stern usb_unlock_device(udev); 28108808f00cSAlan Stern 28118808f00cSAlan Stern if (status == 0) { 28128808f00cSAlan Stern clear_bit(port1, hub->change_bits); 28138808f00cSAlan Stern return; 28148808f00cSAlan Stern } 28158808f00cSAlan Stern } 28168808f00cSAlan Stern 281724618b0cSAlan Stern /* Disconnect any existing devices under this port */ 28188808f00cSAlan Stern if (udev) 281924618b0cSAlan Stern usb_disconnect(&hdev->children[port1-1]); 282024618b0cSAlan Stern clear_bit(port1, hub->change_bits); 282124618b0cSAlan Stern 28225257d97aSAlan Stern if (portchange & (USB_PORT_STAT_C_CONNECTION | 28235257d97aSAlan Stern USB_PORT_STAT_C_ENABLE)) { 28245257d97aSAlan Stern status = hub_port_debounce(hub, port1); 28255257d97aSAlan Stern if (status < 0) { 28265257d97aSAlan Stern if (printk_ratelimit()) 28275257d97aSAlan Stern dev_err(hub_dev, "connect-debounce failed, " 28285257d97aSAlan Stern "port %d disabled\n", port1); 28295257d97aSAlan Stern portstatus &= ~USB_PORT_STAT_CONNECTION; 28305257d97aSAlan Stern } else { 28315257d97aSAlan Stern portstatus = status; 28325257d97aSAlan Stern } 28335257d97aSAlan Stern } 28345257d97aSAlan Stern 283524618b0cSAlan Stern /* Return now if debouncing failed or nothing is connected */ 28361da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) { 28371da177e4SLinus Torvalds 28381da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 283974ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 28401da177e4SLinus Torvalds && !(portstatus & (1 << USB_PORT_FEAT_POWER))) 28411da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 28421da177e4SLinus Torvalds 28431da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 28441da177e4SLinus Torvalds goto done; 28451da177e4SLinus Torvalds return; 28461da177e4SLinus Torvalds } 28471da177e4SLinus Torvalds 28481da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 28491da177e4SLinus Torvalds 28501da177e4SLinus Torvalds /* reallocate for each attempt, since references 28511da177e4SLinus Torvalds * to the previous one can escape in various ways 28521da177e4SLinus Torvalds */ 28531da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 28541da177e4SLinus Torvalds if (!udev) { 28551da177e4SLinus Torvalds dev_err (hub_dev, 28561da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 28571da177e4SLinus Torvalds port1); 28581da177e4SLinus Torvalds goto done; 28591da177e4SLinus Torvalds } 28601da177e4SLinus Torvalds 28611da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 28621da177e4SLinus Torvalds udev->speed = USB_SPEED_UNKNOWN; 286355c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 2864b6956ffaSAlan Stern udev->level = hdev->level + 1; 28658af548dcSInaky Perez-Gonzalez udev->wusb = hub_is_wusb(hub); 28661da177e4SLinus Torvalds 28671da177e4SLinus Torvalds /* set the address */ 28681da177e4SLinus Torvalds choose_address(udev); 28691da177e4SLinus Torvalds if (udev->devnum <= 0) { 28701da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 28711da177e4SLinus Torvalds goto loop; 28721da177e4SLinus Torvalds } 28731da177e4SLinus Torvalds 28741da177e4SLinus Torvalds /* reset and get descriptor */ 28751da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 28761da177e4SLinus Torvalds if (status < 0) 28771da177e4SLinus Torvalds goto loop; 28781da177e4SLinus Torvalds 28791da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 28801da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 28811da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 28821da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 28831da177e4SLinus Torvalds * on the parent. 28841da177e4SLinus Torvalds */ 28851da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 288655c52718SAlan Stern && udev->bus_mA <= 100) { 28871da177e4SLinus Torvalds u16 devstat; 28881da177e4SLinus Torvalds 28891da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 28901da177e4SLinus Torvalds &devstat); 289155c52718SAlan Stern if (status < 2) { 28921da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 28931da177e4SLinus Torvalds goto loop_disable; 28941da177e4SLinus Torvalds } 289555c52718SAlan Stern le16_to_cpus(&devstat); 28961da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 28971da177e4SLinus Torvalds dev_err(&udev->dev, 28981da177e4SLinus Torvalds "can't connect bus-powered hub " 28991da177e4SLinus Torvalds "to this port\n"); 29001da177e4SLinus Torvalds if (hub->has_indicators) { 29011da177e4SLinus Torvalds hub->indicator[port1-1] = 29021da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 2903c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 29041da177e4SLinus Torvalds } 29051da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 29061da177e4SLinus Torvalds goto loop_disable; 29071da177e4SLinus Torvalds } 29081da177e4SLinus Torvalds } 29091da177e4SLinus Torvalds 29101da177e4SLinus Torvalds /* check for devices running slower than they could */ 29111da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 29121da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 29131da177e4SLinus Torvalds && highspeed_hubs != 0) 29141da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 29151da177e4SLinus Torvalds 29161da177e4SLinus Torvalds /* Store the parent's children[] pointer. At this point 29171da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 29181da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 29191da177e4SLinus Torvalds */ 29201da177e4SLinus Torvalds status = 0; 29211da177e4SLinus Torvalds 29221da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 29231da177e4SLinus Torvalds * been disconnected; we would race with the 29241da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 29251da177e4SLinus Torvalds */ 29261da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 29271da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 29281da177e4SLinus Torvalds status = -ENOTCONN; 29291da177e4SLinus Torvalds else 29301da177e4SLinus Torvalds hdev->children[port1-1] = udev; 29311da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 29321da177e4SLinus Torvalds 29331da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 29341da177e4SLinus Torvalds if (!status) { 29351da177e4SLinus Torvalds status = usb_new_device(udev); 29361da177e4SLinus Torvalds if (status) { 29371da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 29381da177e4SLinus Torvalds hdev->children[port1-1] = NULL; 29391da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 29401da177e4SLinus Torvalds } 29411da177e4SLinus Torvalds } 29421da177e4SLinus Torvalds 29431da177e4SLinus Torvalds if (status) 29441da177e4SLinus Torvalds goto loop_disable; 29451da177e4SLinus Torvalds 29461da177e4SLinus Torvalds status = hub_power_remaining(hub); 29471da177e4SLinus Torvalds if (status) 294855c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 29491da177e4SLinus Torvalds 29501da177e4SLinus Torvalds return; 29511da177e4SLinus Torvalds 29521da177e4SLinus Torvalds loop_disable: 29531da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 29541da177e4SLinus Torvalds loop: 2955fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 29561da177e4SLinus Torvalds release_address(udev); 29571da177e4SLinus Torvalds usb_put_dev(udev); 2958ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 29591da177e4SLinus Torvalds break; 29601da177e4SLinus Torvalds } 29613a31155cSAlan Stern if (hub->hdev->parent || 29623a31155cSAlan Stern !hcd->driver->port_handed_over || 29633a31155cSAlan Stern !(hcd->driver->port_handed_over)(hcd, port1)) 29643a31155cSAlan Stern dev_err(hub_dev, "unable to enumerate USB device on port %d\n", 29653a31155cSAlan Stern port1); 29661da177e4SLinus Torvalds 29671da177e4SLinus Torvalds done: 29681da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 296990da096eSBalaji Rao if (hcd->driver->relinquish_port && !hub->hdev->parent) 297090da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 29711da177e4SLinus Torvalds } 29721da177e4SLinus Torvalds 29731da177e4SLinus Torvalds static void hub_events(void) 29741da177e4SLinus Torvalds { 29751da177e4SLinus Torvalds struct list_head *tmp; 29761da177e4SLinus Torvalds struct usb_device *hdev; 29771da177e4SLinus Torvalds struct usb_interface *intf; 29781da177e4SLinus Torvalds struct usb_hub *hub; 29791da177e4SLinus Torvalds struct device *hub_dev; 29801da177e4SLinus Torvalds u16 hubstatus; 29811da177e4SLinus Torvalds u16 hubchange; 29821da177e4SLinus Torvalds u16 portstatus; 29831da177e4SLinus Torvalds u16 portchange; 29841da177e4SLinus Torvalds int i, ret; 29851da177e4SLinus Torvalds int connect_change; 29861da177e4SLinus Torvalds 29871da177e4SLinus Torvalds /* 29881da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 29891da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 29901da177e4SLinus Torvalds * safe since we delete the hub from the event list. 29911da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 29921da177e4SLinus Torvalds */ 29931da177e4SLinus Torvalds while (1) { 29941da177e4SLinus Torvalds 29951da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 29961da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 29971da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 29981da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 29991da177e4SLinus Torvalds break; 30001da177e4SLinus Torvalds } 30011da177e4SLinus Torvalds 30021da177e4SLinus Torvalds tmp = hub_event_list.next; 30031da177e4SLinus Torvalds list_del_init(tmp); 30041da177e4SLinus Torvalds 30051da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 3006e8054854SAlan Stern kref_get(&hub->kref); 3007e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 30081da177e4SLinus Torvalds 3009e8054854SAlan Stern hdev = hub->hdev; 3010e8054854SAlan Stern hub_dev = hub->intfdev; 3011e8054854SAlan Stern intf = to_usb_interface(hub_dev); 301240f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 30131da177e4SLinus Torvalds hdev->state, hub->descriptor 30141da177e4SLinus Torvalds ? hub->descriptor->bNbrPorts 30151da177e4SLinus Torvalds : 0, 30161da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 30171da177e4SLinus Torvalds (u16) hub->change_bits[0], 301840f122f3SAlan Stern (u16) hub->event_bits[0]); 30191da177e4SLinus Torvalds 30201da177e4SLinus Torvalds /* Lock the device, then check to see if we were 30211da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 302206b84e8aSAlan Stern usb_lock_device(hdev); 3023e8054854SAlan Stern if (unlikely(hub->disconnected)) 30241da177e4SLinus Torvalds goto loop; 30251da177e4SLinus Torvalds 30261da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 30271da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 30287de18d8bSAlan Stern hub->error = -ENODEV; 30294330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 30301da177e4SLinus Torvalds goto loop; 30311da177e4SLinus Torvalds } 30321da177e4SLinus Torvalds 303340f122f3SAlan Stern /* Autoresume */ 303440f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 303540f122f3SAlan Stern if (ret) { 303640f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 30371da177e4SLinus Torvalds goto loop; 303840f122f3SAlan Stern } 303940f122f3SAlan Stern 304040f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 304140f122f3SAlan Stern if (hub->quiescing) 304240f122f3SAlan Stern goto loop_autopm; 30431da177e4SLinus Torvalds 30441da177e4SLinus Torvalds if (hub->error) { 30451da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 30461da177e4SLinus Torvalds hub->error); 30471da177e4SLinus Torvalds 3048742120c6SMing Lei ret = usb_reset_device(hdev); 30491da177e4SLinus Torvalds if (ret) { 30501da177e4SLinus Torvalds dev_dbg (hub_dev, 30511da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 305240f122f3SAlan Stern goto loop_autopm; 30531da177e4SLinus Torvalds } 30541da177e4SLinus Torvalds 30551da177e4SLinus Torvalds hub->nerrors = 0; 30561da177e4SLinus Torvalds hub->error = 0; 30571da177e4SLinus Torvalds } 30581da177e4SLinus Torvalds 30591da177e4SLinus Torvalds /* deal with port status changes */ 30601da177e4SLinus Torvalds for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { 30611da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 30621da177e4SLinus Torvalds continue; 30631da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 30641da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 30656ee0b270SAlan Stern !connect_change) 30661da177e4SLinus Torvalds continue; 30671da177e4SLinus Torvalds 30681da177e4SLinus Torvalds ret = hub_port_status(hub, i, 30691da177e4SLinus Torvalds &portstatus, &portchange); 30701da177e4SLinus Torvalds if (ret < 0) 30711da177e4SLinus Torvalds continue; 30721da177e4SLinus Torvalds 30731da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 30741da177e4SLinus Torvalds clear_port_feature(hdev, i, 30751da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 30761da177e4SLinus Torvalds connect_change = 1; 30771da177e4SLinus Torvalds } 30781da177e4SLinus Torvalds 30791da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 30801da177e4SLinus Torvalds if (!connect_change) 30811da177e4SLinus Torvalds dev_dbg (hub_dev, 30821da177e4SLinus Torvalds "port %d enable change, " 30831da177e4SLinus Torvalds "status %08x\n", 30841da177e4SLinus Torvalds i, portstatus); 30851da177e4SLinus Torvalds clear_port_feature(hdev, i, 30861da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 30871da177e4SLinus Torvalds 30881da177e4SLinus Torvalds /* 30891da177e4SLinus Torvalds * EM interference sometimes causes badly 30901da177e4SLinus Torvalds * shielded USB devices to be shutdown by 30911da177e4SLinus Torvalds * the hub, this hack enables them again. 30921da177e4SLinus Torvalds * Works at least with mouse driver. 30931da177e4SLinus Torvalds */ 30941da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 30951da177e4SLinus Torvalds && !connect_change 30961da177e4SLinus Torvalds && hdev->children[i-1]) { 30971da177e4SLinus Torvalds dev_err (hub_dev, 30981da177e4SLinus Torvalds "port %i " 30991da177e4SLinus Torvalds "disabled by hub (EMI?), " 31001da177e4SLinus Torvalds "re-enabling...\n", 31011da177e4SLinus Torvalds i); 31021da177e4SLinus Torvalds connect_change = 1; 31031da177e4SLinus Torvalds } 31041da177e4SLinus Torvalds } 31051da177e4SLinus Torvalds 31061da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_SUSPEND) { 31078808f00cSAlan Stern struct usb_device *udev; 31088808f00cSAlan Stern 31091da177e4SLinus Torvalds clear_port_feature(hdev, i, 31101da177e4SLinus Torvalds USB_PORT_FEAT_C_SUSPEND); 31118808f00cSAlan Stern udev = hdev->children[i-1]; 31128808f00cSAlan Stern if (udev) { 31138808f00cSAlan Stern usb_lock_device(udev); 31141da177e4SLinus Torvalds ret = remote_wakeup(hdev-> 31151da177e4SLinus Torvalds children[i-1]); 31168808f00cSAlan Stern usb_unlock_device(udev); 31171da177e4SLinus Torvalds if (ret < 0) 31181da177e4SLinus Torvalds connect_change = 1; 31191da177e4SLinus Torvalds } else { 31201da177e4SLinus Torvalds ret = -ENODEV; 31211da177e4SLinus Torvalds hub_port_disable(hub, i, 1); 31221da177e4SLinus Torvalds } 31231da177e4SLinus Torvalds dev_dbg (hub_dev, 31241da177e4SLinus Torvalds "resume on port %d, status %d\n", 31251da177e4SLinus Torvalds i, ret); 31261da177e4SLinus Torvalds } 31271da177e4SLinus Torvalds 31281da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 31291da177e4SLinus Torvalds dev_err (hub_dev, 31301da177e4SLinus Torvalds "over-current change on port %d\n", 31311da177e4SLinus Torvalds i); 31321da177e4SLinus Torvalds clear_port_feature(hdev, i, 31331da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 31348520f380SAlan Stern hub_power_on(hub, true); 31351da177e4SLinus Torvalds } 31361da177e4SLinus Torvalds 31371da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 31381da177e4SLinus Torvalds dev_dbg (hub_dev, 31391da177e4SLinus Torvalds "reset change on port %d\n", 31401da177e4SLinus Torvalds i); 31411da177e4SLinus Torvalds clear_port_feature(hdev, i, 31421da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 31431da177e4SLinus Torvalds } 31441da177e4SLinus Torvalds 31451da177e4SLinus Torvalds if (connect_change) 31461da177e4SLinus Torvalds hub_port_connect_change(hub, i, 31471da177e4SLinus Torvalds portstatus, portchange); 31481da177e4SLinus Torvalds } /* end for i */ 31491da177e4SLinus Torvalds 31501da177e4SLinus Torvalds /* deal with hub status changes */ 31511da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 31521da177e4SLinus Torvalds ; /* do nothing */ 31531da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 31541da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 31551da177e4SLinus Torvalds else { 31561da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 31571da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 31581da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 315955c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 316055c52718SAlan Stern /* FIXME: Is this always true? */ 316155c52718SAlan Stern hub->limited_power = 1; 3162403fae78Sjidong xiao else 3163403fae78Sjidong xiao hub->limited_power = 0; 31641da177e4SLinus Torvalds } 31651da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 31661da177e4SLinus Torvalds dev_dbg (hub_dev, "overcurrent change\n"); 31671da177e4SLinus Torvalds msleep(500); /* Cool down */ 31681da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 31698520f380SAlan Stern hub_power_on(hub, true); 31701da177e4SLinus Torvalds } 31711da177e4SLinus Torvalds } 31721da177e4SLinus Torvalds 317340f122f3SAlan Stern loop_autopm: 317440f122f3SAlan Stern /* Allow autosuspend if we're not going to run again */ 317540f122f3SAlan Stern if (list_empty(&hub->event_list)) 317640f122f3SAlan Stern usb_autopm_enable(intf); 31771da177e4SLinus Torvalds loop: 31781da177e4SLinus Torvalds usb_unlock_device(hdev); 3179e8054854SAlan Stern kref_put(&hub->kref, hub_release); 31801da177e4SLinus Torvalds 31811da177e4SLinus Torvalds } /* end while (1) */ 31821da177e4SLinus Torvalds } 31831da177e4SLinus Torvalds 31841da177e4SLinus Torvalds static int hub_thread(void *__unused) 31851da177e4SLinus Torvalds { 31863bb1af52SAlan Stern /* khubd needs to be freezable to avoid intefering with USB-PERSIST 31873bb1af52SAlan Stern * port handover. Otherwise it might see that a full-speed device 31883bb1af52SAlan Stern * was gone before the EHCI controller had handed its port over to 31893bb1af52SAlan Stern * the companion full-speed controller. 31903bb1af52SAlan Stern */ 319183144186SRafael J. Wysocki set_freezable(); 31923bb1af52SAlan Stern 31931da177e4SLinus Torvalds do { 31941da177e4SLinus Torvalds hub_events(); 3195e42837bcSRafael J. Wysocki wait_event_freezable(khubd_wait, 31969c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 31979c8d6178Sakpm@osdl.org kthread_should_stop()); 31989c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 31991da177e4SLinus Torvalds 32001da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 32019c8d6178Sakpm@osdl.org return 0; 32021da177e4SLinus Torvalds } 32031da177e4SLinus Torvalds 32041da177e4SLinus Torvalds static struct usb_device_id hub_id_table [] = { 32051da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 32061da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 32071da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 32081da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 32091da177e4SLinus Torvalds { } /* Terminating entry */ 32101da177e4SLinus Torvalds }; 32111da177e4SLinus Torvalds 32121da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 32131da177e4SLinus Torvalds 32141da177e4SLinus Torvalds static struct usb_driver hub_driver = { 32151da177e4SLinus Torvalds .name = "hub", 32161da177e4SLinus Torvalds .probe = hub_probe, 32171da177e4SLinus Torvalds .disconnect = hub_disconnect, 32181da177e4SLinus Torvalds .suspend = hub_suspend, 32191da177e4SLinus Torvalds .resume = hub_resume, 3220f07600cfSAlan Stern .reset_resume = hub_reset_resume, 32217de18d8bSAlan Stern .pre_reset = hub_pre_reset, 32227de18d8bSAlan Stern .post_reset = hub_post_reset, 32231da177e4SLinus Torvalds .ioctl = hub_ioctl, 32241da177e4SLinus Torvalds .id_table = hub_id_table, 322540f122f3SAlan Stern .supports_autosuspend = 1, 32261da177e4SLinus Torvalds }; 32271da177e4SLinus Torvalds 32281da177e4SLinus Torvalds int usb_hub_init(void) 32291da177e4SLinus Torvalds { 32301da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 32311da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 32321da177e4SLinus Torvalds usbcore_name); 32331da177e4SLinus Torvalds return -1; 32341da177e4SLinus Torvalds } 32351da177e4SLinus Torvalds 32369c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 32379c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 32381da177e4SLinus Torvalds return 0; 32391da177e4SLinus Torvalds 32401da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 32411da177e4SLinus Torvalds usb_deregister(&hub_driver); 32421da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 32431da177e4SLinus Torvalds 32441da177e4SLinus Torvalds return -1; 32451da177e4SLinus Torvalds } 32461da177e4SLinus Torvalds 32471da177e4SLinus Torvalds void usb_hub_cleanup(void) 32481da177e4SLinus Torvalds { 32499c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 32501da177e4SLinus Torvalds 32511da177e4SLinus Torvalds /* 32521da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 32531da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 32541da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 32551da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 32561da177e4SLinus Torvalds * individual hub resources. -greg 32571da177e4SLinus Torvalds */ 32581da177e4SLinus Torvalds usb_deregister(&hub_driver); 32591da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 32601da177e4SLinus Torvalds 3261eb764c4bSAlan Stern static int descriptors_changed(struct usb_device *udev, 3262eb764c4bSAlan Stern struct usb_device_descriptor *old_device_descriptor) 32631da177e4SLinus Torvalds { 3264eb764c4bSAlan Stern int changed = 0; 32651da177e4SLinus Torvalds unsigned index; 3266eb764c4bSAlan Stern unsigned serial_len = 0; 3267eb764c4bSAlan Stern unsigned len; 3268eb764c4bSAlan Stern unsigned old_length; 3269eb764c4bSAlan Stern int length; 3270eb764c4bSAlan Stern char *buf; 32711da177e4SLinus Torvalds 3272eb764c4bSAlan Stern if (memcmp(&udev->descriptor, old_device_descriptor, 3273eb764c4bSAlan Stern sizeof(*old_device_descriptor)) != 0) 3274eb764c4bSAlan Stern return 1; 3275eb764c4bSAlan Stern 3276eb764c4bSAlan Stern /* Since the idVendor, idProduct, and bcdDevice values in the 3277eb764c4bSAlan Stern * device descriptor haven't changed, we will assume the 3278eb764c4bSAlan Stern * Manufacturer and Product strings haven't changed either. 3279eb764c4bSAlan Stern * But the SerialNumber string could be different (e.g., a 3280eb764c4bSAlan Stern * different flash card of the same brand). 3281eb764c4bSAlan Stern */ 3282eb764c4bSAlan Stern if (udev->serial) 3283eb764c4bSAlan Stern serial_len = strlen(udev->serial) + 1; 3284eb764c4bSAlan Stern 3285eb764c4bSAlan Stern len = serial_len; 32861da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 3287eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 3288eb764c4bSAlan Stern len = max(len, old_length); 32891da177e4SLinus Torvalds } 3290eb764c4bSAlan Stern 32910cc1a51fSOliver Neukum buf = kmalloc(len, GFP_NOIO); 32921da177e4SLinus Torvalds if (buf == NULL) { 32931da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 32941da177e4SLinus Torvalds /* assume the worst */ 32951da177e4SLinus Torvalds return 1; 32961da177e4SLinus Torvalds } 32971da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 3298eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 32991da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 33001da177e4SLinus Torvalds old_length); 3301eb764c4bSAlan Stern if (length != old_length) { 33021da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 33031da177e4SLinus Torvalds index, length); 3304eb764c4bSAlan Stern changed = 1; 33051da177e4SLinus Torvalds break; 33061da177e4SLinus Torvalds } 33071da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 33081da177e4SLinus Torvalds != 0) { 33091da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 3310eb764c4bSAlan Stern index, 3311eb764c4bSAlan Stern ((struct usb_config_descriptor *) buf)-> 3312eb764c4bSAlan Stern bConfigurationValue); 3313eb764c4bSAlan Stern changed = 1; 33141da177e4SLinus Torvalds break; 33151da177e4SLinus Torvalds } 33161da177e4SLinus Torvalds } 3317eb764c4bSAlan Stern 3318eb764c4bSAlan Stern if (!changed && serial_len) { 3319eb764c4bSAlan Stern length = usb_string(udev, udev->descriptor.iSerialNumber, 3320eb764c4bSAlan Stern buf, serial_len); 3321eb764c4bSAlan Stern if (length + 1 != serial_len) { 3322eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string error %d\n", 3323eb764c4bSAlan Stern length); 3324eb764c4bSAlan Stern changed = 1; 3325eb764c4bSAlan Stern } else if (memcmp(buf, udev->serial, length) != 0) { 3326eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string changed\n"); 3327eb764c4bSAlan Stern changed = 1; 3328eb764c4bSAlan Stern } 3329eb764c4bSAlan Stern } 3330eb764c4bSAlan Stern 33311da177e4SLinus Torvalds kfree(buf); 3332eb764c4bSAlan Stern return changed; 33331da177e4SLinus Torvalds } 33341da177e4SLinus Torvalds 33351da177e4SLinus Torvalds /** 3336742120c6SMing Lei * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device 33371da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 33381da177e4SLinus Torvalds * 333979efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 334079efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 3341742120c6SMing Lei * Use usb_reset_device() instead. 33421da177e4SLinus Torvalds * 33431da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 33441da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 33451da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 33461da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 33471da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 33481da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 33491da177e4SLinus Torvalds * re-enumerated and probed all over again. 33501da177e4SLinus Torvalds * 33511da177e4SLinus Torvalds * Returns 0 if the reset succeeded, -ENODEV if the device has been 33521da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 33531da177e4SLinus Torvalds * if the reset wasn't even attempted. 33541da177e4SLinus Torvalds * 33551da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 33561da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 33571da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 33581da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 33596bc6cff5SAlan Stern * 33606bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 33616bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 33626bc6cff5SAlan Stern * holding the device lock because these tasks should always call 33636bc6cff5SAlan Stern * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. 33641da177e4SLinus Torvalds */ 3365742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev) 33661da177e4SLinus Torvalds { 33671da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 33681da177e4SLinus Torvalds struct usb_hub *parent_hub; 33691da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 337012c3da34SAlan Stern int i, ret = 0; 337112c3da34SAlan Stern int port1 = udev->portnum; 33721da177e4SLinus Torvalds 33731da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 33741da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 33751da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 33761da177e4SLinus Torvalds udev->state); 33771da177e4SLinus Torvalds return -EINVAL; 33781da177e4SLinus Torvalds } 33791da177e4SLinus Torvalds 33801da177e4SLinus Torvalds if (!parent_hdev) { 33811da177e4SLinus Torvalds /* this requires hcd-specific logic; see OHCI hc_restart() */ 3382441b62c1SHarvey Harrison dev_dbg(&udev->dev, "%s for root hub!\n", __func__); 33831da177e4SLinus Torvalds return -EISDIR; 33841da177e4SLinus Torvalds } 33851da177e4SLinus Torvalds parent_hub = hdev_to_hub(parent_hdev); 33861da177e4SLinus Torvalds 33871da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 33881da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 33891da177e4SLinus Torvalds 33901da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 33911da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 3392fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 33931da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 3394dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 33951da177e4SLinus Torvalds break; 33961da177e4SLinus Torvalds } 33971da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 3398d5cbad4bSAlan Stern 33991da177e4SLinus Torvalds if (ret < 0) 34001da177e4SLinus Torvalds goto re_enumerate; 34011da177e4SLinus Torvalds 34021da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 3403eb764c4bSAlan Stern if (descriptors_changed(udev, &descriptor)) { 34041da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 34051da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 34061da177e4SLinus Torvalds goto re_enumerate; 34071da177e4SLinus Torvalds } 34081da177e4SLinus Torvalds 34094fe0387aSAlan Stern /* Restore the device's previous configuration */ 34101da177e4SLinus Torvalds if (!udev->actconfig) 34111da177e4SLinus Torvalds goto done; 34121da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 34131da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 34141da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 34151da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 34161da177e4SLinus Torvalds if (ret < 0) { 34171da177e4SLinus Torvalds dev_err(&udev->dev, 34181da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 34191da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 34201da177e4SLinus Torvalds goto re_enumerate; 34211da177e4SLinus Torvalds } 34221da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 34231da177e4SLinus Torvalds 34244fe0387aSAlan Stern /* Put interfaces back into the same altsettings as before. 34254fe0387aSAlan Stern * Don't bother to send the Set-Interface request for interfaces 34264fe0387aSAlan Stern * that were already in altsetting 0; besides being unnecessary, 34274fe0387aSAlan Stern * many devices can't handle it. Instead just reset the host-side 34284fe0387aSAlan Stern * endpoint state. 34294fe0387aSAlan Stern */ 34301da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 34311da177e4SLinus Torvalds struct usb_interface *intf = udev->actconfig->interface[i]; 34321da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 34331da177e4SLinus Torvalds 34341da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 34354fe0387aSAlan Stern if (desc->bAlternateSetting == 0) { 34364fe0387aSAlan Stern usb_disable_interface(udev, intf, true); 34374fe0387aSAlan Stern usb_enable_interface(udev, intf, true); 34384fe0387aSAlan Stern ret = 0; 34394fe0387aSAlan Stern } else { 34401da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 34411da177e4SLinus Torvalds desc->bAlternateSetting); 34424fe0387aSAlan Stern } 34431da177e4SLinus Torvalds if (ret < 0) { 34441da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 34451da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 34461da177e4SLinus Torvalds desc->bInterfaceNumber, 34471da177e4SLinus Torvalds desc->bAlternateSetting, 34481da177e4SLinus Torvalds ret); 34491da177e4SLinus Torvalds goto re_enumerate; 34501da177e4SLinus Torvalds } 34511da177e4SLinus Torvalds } 34521da177e4SLinus Torvalds 34531da177e4SLinus Torvalds done: 34541da177e4SLinus Torvalds return 0; 34551da177e4SLinus Torvalds 34561da177e4SLinus Torvalds re_enumerate: 34571da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 34581da177e4SLinus Torvalds return -ENODEV; 34591da177e4SLinus Torvalds } 346079efa097SAlan Stern 346179efa097SAlan Stern /** 3462742120c6SMing Lei * usb_reset_device - warn interface drivers and perform a USB port reset 346379efa097SAlan Stern * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 346479efa097SAlan Stern * 346579efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 346679efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 346779efa097SAlan Stern * the reset is over (using their post_reset method). 346879efa097SAlan Stern * 3469742120c6SMing Lei * Return value is the same as for usb_reset_and_verify_device(). 347079efa097SAlan Stern * 347179efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 347279efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 347379efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 347479efa097SAlan Stern * the device using usb_lock_device_for_reset(). 347578d9a487SAlan Stern * 347678d9a487SAlan Stern * If an interface is currently being probed or disconnected, we assume 347778d9a487SAlan Stern * its driver knows how to handle resets. For all other interfaces, 347878d9a487SAlan Stern * if the driver doesn't have pre_reset and post_reset methods then 347978d9a487SAlan Stern * we attempt to unbind it and rebind afterward. 348079efa097SAlan Stern */ 3481742120c6SMing Lei int usb_reset_device(struct usb_device *udev) 348279efa097SAlan Stern { 348379efa097SAlan Stern int ret; 3484852c4b43SAlan Stern int i; 348579efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 348679efa097SAlan Stern 348779efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 348879efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 348979efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 349079efa097SAlan Stern udev->state); 349179efa097SAlan Stern return -EINVAL; 349279efa097SAlan Stern } 349379efa097SAlan Stern 3494645daaabSAlan Stern /* Prevent autosuspend during the reset */ 349594fcda1fSAlan Stern usb_autoresume_device(udev); 3496645daaabSAlan Stern 349779efa097SAlan Stern if (config) { 3498852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 3499852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 350079efa097SAlan Stern struct usb_driver *drv; 350178d9a487SAlan Stern int unbind = 0; 350279efa097SAlan Stern 3503852c4b43SAlan Stern if (cintf->dev.driver) { 350479efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 350578d9a487SAlan Stern if (drv->pre_reset && drv->post_reset) 350678d9a487SAlan Stern unbind = (drv->pre_reset)(cintf); 350778d9a487SAlan Stern else if (cintf->condition == 350878d9a487SAlan Stern USB_INTERFACE_BOUND) 350978d9a487SAlan Stern unbind = 1; 351078d9a487SAlan Stern if (unbind) 351178d9a487SAlan Stern usb_forced_unbind_intf(cintf); 351279efa097SAlan Stern } 351379efa097SAlan Stern } 351479efa097SAlan Stern } 351579efa097SAlan Stern 3516742120c6SMing Lei ret = usb_reset_and_verify_device(udev); 351779efa097SAlan Stern 351879efa097SAlan Stern if (config) { 3519852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 3520852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 352179efa097SAlan Stern struct usb_driver *drv; 352278d9a487SAlan Stern int rebind = cintf->needs_binding; 352379efa097SAlan Stern 352478d9a487SAlan Stern if (!rebind && cintf->dev.driver) { 352579efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 352679efa097SAlan Stern if (drv->post_reset) 352778d9a487SAlan Stern rebind = (drv->post_reset)(cintf); 352878d9a487SAlan Stern else if (cintf->condition == 352978d9a487SAlan Stern USB_INTERFACE_BOUND) 353078d9a487SAlan Stern rebind = 1; 353179efa097SAlan Stern } 35326c640945SAlan Stern if (ret == 0 && rebind) 353378d9a487SAlan Stern usb_rebind_intf(cintf); 353479efa097SAlan Stern } 353579efa097SAlan Stern } 353679efa097SAlan Stern 353794fcda1fSAlan Stern usb_autosuspend_device(udev); 353879efa097SAlan Stern return ret; 353979efa097SAlan Stern } 3540742120c6SMing Lei EXPORT_SYMBOL_GPL(usb_reset_device); 3541dc023dceSInaky Perez-Gonzalez 3542dc023dceSInaky Perez-Gonzalez 3543dc023dceSInaky Perez-Gonzalez /** 3544dc023dceSInaky Perez-Gonzalez * usb_queue_reset_device - Reset a USB device from an atomic context 3545dc023dceSInaky Perez-Gonzalez * @iface: USB interface belonging to the device to reset 3546dc023dceSInaky Perez-Gonzalez * 3547dc023dceSInaky Perez-Gonzalez * This function can be used to reset a USB device from an atomic 3548dc023dceSInaky Perez-Gonzalez * context, where usb_reset_device() won't work (as it blocks). 3549dc023dceSInaky Perez-Gonzalez * 3550dc023dceSInaky Perez-Gonzalez * Doing a reset via this method is functionally equivalent to calling 3551dc023dceSInaky Perez-Gonzalez * usb_reset_device(), except for the fact that it is delayed to a 3552dc023dceSInaky Perez-Gonzalez * workqueue. This means that any drivers bound to other interfaces 3553dc023dceSInaky Perez-Gonzalez * might be unbound, as well as users from usbfs in user space. 3554dc023dceSInaky Perez-Gonzalez * 3555dc023dceSInaky Perez-Gonzalez * Corner cases: 3556dc023dceSInaky Perez-Gonzalez * 3557dc023dceSInaky Perez-Gonzalez * - Scheduling two resets at the same time from two different drivers 3558dc023dceSInaky Perez-Gonzalez * attached to two different interfaces of the same device is 3559dc023dceSInaky Perez-Gonzalez * possible; depending on how the driver attached to each interface 3560dc023dceSInaky Perez-Gonzalez * handles ->pre_reset(), the second reset might happen or not. 3561dc023dceSInaky Perez-Gonzalez * 3562dc023dceSInaky Perez-Gonzalez * - If a driver is unbound and it had a pending reset, the reset will 3563dc023dceSInaky Perez-Gonzalez * be cancelled. 3564dc023dceSInaky Perez-Gonzalez * 3565dc023dceSInaky Perez-Gonzalez * - This function can be called during .probe() or .disconnect() 3566dc023dceSInaky Perez-Gonzalez * times. On return from .disconnect(), any pending resets will be 3567dc023dceSInaky Perez-Gonzalez * cancelled. 3568dc023dceSInaky Perez-Gonzalez * 3569dc023dceSInaky Perez-Gonzalez * There is no no need to lock/unlock the @reset_ws as schedule_work() 3570dc023dceSInaky Perez-Gonzalez * does its own. 3571dc023dceSInaky Perez-Gonzalez * 3572dc023dceSInaky Perez-Gonzalez * NOTE: We don't do any reference count tracking because it is not 3573dc023dceSInaky Perez-Gonzalez * needed. The lifecycle of the work_struct is tied to the 3574dc023dceSInaky Perez-Gonzalez * usb_interface. Before destroying the interface we cancel the 3575dc023dceSInaky Perez-Gonzalez * work_struct, so the fact that work_struct is queued and or 3576dc023dceSInaky Perez-Gonzalez * running means the interface (and thus, the device) exist and 3577dc023dceSInaky Perez-Gonzalez * are referenced. 3578dc023dceSInaky Perez-Gonzalez */ 3579dc023dceSInaky Perez-Gonzalez void usb_queue_reset_device(struct usb_interface *iface) 3580dc023dceSInaky Perez-Gonzalez { 3581dc023dceSInaky Perez-Gonzalez schedule_work(&iface->reset_ws); 3582dc023dceSInaky Perez-Gonzalez } 3583dc023dceSInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_queue_reset_device); 3584