11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * USB hub driver. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * (C) Copyright 1999 Linus Torvalds 51da177e4SLinus Torvalds * (C) Copyright 1999 Johannes Erdfelt 61da177e4SLinus Torvalds * (C) Copyright 1999 Gregory P. Smith 71da177e4SLinus Torvalds * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds 111da177e4SLinus Torvalds #include <linux/kernel.h> 121da177e4SLinus Torvalds #include <linux/errno.h> 131da177e4SLinus Torvalds #include <linux/module.h> 141da177e4SLinus Torvalds #include <linux/moduleparam.h> 151da177e4SLinus Torvalds #include <linux/completion.h> 161da177e4SLinus Torvalds #include <linux/sched.h> 171da177e4SLinus Torvalds #include <linux/list.h> 181da177e4SLinus Torvalds #include <linux/slab.h> 191da177e4SLinus Torvalds #include <linux/ioctl.h> 201da177e4SLinus Torvalds #include <linux/usb.h> 211da177e4SLinus Torvalds #include <linux/usbdevice_fs.h> 2227729aadSEric Lescouet #include <linux/usb/hcd.h> 2393362a87SPhil Dibowitz #include <linux/usb/quirks.h> 249c8d6178Sakpm@osdl.org #include <linux/kthread.h> 254186ecf8SArjan van de Ven #include <linux/mutex.h> 267dfb7103SNigel Cunningham #include <linux/freezer.h> 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds #include <asm/uaccess.h> 291da177e4SLinus Torvalds #include <asm/byteorder.h> 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #include "usb.h" 321da177e4SLinus Torvalds 33f2a383e4SGreg Kroah-Hartman /* if we are in debug mode, always announce new devices */ 34f2a383e4SGreg Kroah-Hartman #ifdef DEBUG 35f2a383e4SGreg Kroah-Hartman #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES 36f2a383e4SGreg Kroah-Hartman #define CONFIG_USB_ANNOUNCE_NEW_DEVICES 37f2a383e4SGreg Kroah-Hartman #endif 38f2a383e4SGreg Kroah-Hartman #endif 39f2a383e4SGreg Kroah-Hartman 401bb5f66bSAlan Stern struct usb_hub { 411bb5f66bSAlan Stern struct device *intfdev; /* the "interface" device */ 421bb5f66bSAlan Stern struct usb_device *hdev; 43e8054854SAlan Stern struct kref kref; 441bb5f66bSAlan Stern struct urb *urb; /* for interrupt polling pipe */ 451bb5f66bSAlan Stern 461bb5f66bSAlan Stern /* buffer for urb ... with extra space in case of babble */ 471bb5f66bSAlan Stern char (*buffer)[8]; 481bb5f66bSAlan Stern union { 491bb5f66bSAlan Stern struct usb_hub_status hub; 501bb5f66bSAlan Stern struct usb_port_status port; 511bb5f66bSAlan Stern } *status; /* buffer for status reports */ 52db90e7a1SAlan Stern struct mutex status_mutex; /* for the status buffer */ 531bb5f66bSAlan Stern 541bb5f66bSAlan Stern int error; /* last reported error */ 551bb5f66bSAlan Stern int nerrors; /* track consecutive errors */ 561bb5f66bSAlan Stern 571bb5f66bSAlan Stern struct list_head event_list; /* hubs w/data or errs ready */ 581bb5f66bSAlan Stern unsigned long event_bits[1]; /* status change bitmask */ 591bb5f66bSAlan Stern unsigned long change_bits[1]; /* ports with logical connect 601bb5f66bSAlan Stern status change */ 611bb5f66bSAlan Stern unsigned long busy_bits[1]; /* ports being reset or 621bb5f66bSAlan Stern resumed */ 63253e0572SAlan Stern unsigned long removed_bits[1]; /* ports with a "removed" 64253e0572SAlan Stern device present */ 651bb5f66bSAlan Stern #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ 661bb5f66bSAlan Stern #error event_bits[] is too short! 671bb5f66bSAlan Stern #endif 681bb5f66bSAlan Stern 691bb5f66bSAlan Stern struct usb_hub_descriptor *descriptor; /* class descriptor */ 701bb5f66bSAlan Stern struct usb_tt tt; /* Transaction Translator */ 711bb5f66bSAlan Stern 721bb5f66bSAlan Stern unsigned mA_per_port; /* current for each child */ 731bb5f66bSAlan Stern 741bb5f66bSAlan Stern unsigned limited_power:1; 751bb5f66bSAlan Stern unsigned quiescing:1; 76e8054854SAlan Stern unsigned disconnected:1; 771bb5f66bSAlan Stern 781bb5f66bSAlan Stern unsigned has_indicators:1; 791bb5f66bSAlan Stern u8 indicator[USB_MAXCHILDREN]; 806d5aefb8SDavid Howells struct delayed_work leds; 818520f380SAlan Stern struct delayed_work init_work; 827cbe5dcaSAlan Stern void **port_owners; 831bb5f66bSAlan Stern }; 841bb5f66bSAlan Stern 85dbe79bbeSJohn Youn static inline int hub_is_superspeed(struct usb_device *hdev) 86dbe79bbeSJohn Youn { 87dbe79bbeSJohn Youn return (hdev->descriptor.bDeviceProtocol == 3); 88dbe79bbeSJohn Youn } 891bb5f66bSAlan Stern 901da177e4SLinus Torvalds /* Protect struct usb_device->state and ->children members 919ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 921da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 931da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds /* khubd's worklist and its lock */ 961da177e4SLinus Torvalds static DEFINE_SPINLOCK(hub_event_lock); 971da177e4SLinus Torvalds static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ 981da177e4SLinus Torvalds 991da177e4SLinus Torvalds /* Wakes up khubd */ 1001da177e4SLinus Torvalds static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); 1011da177e4SLinus Torvalds 1029c8d6178Sakpm@osdl.org static struct task_struct *khubd_task; 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 1051da177e4SLinus Torvalds static int blinkenlights = 0; 1061da177e4SLinus Torvalds module_param (blinkenlights, bool, S_IRUGO); 1071da177e4SLinus Torvalds MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds /* 110fd7c519dSJaroslav Kysela * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about 111fd7c519dSJaroslav Kysela * 10 seconds to send reply for the initial 64-byte descriptor request. 112fd7c519dSJaroslav Kysela */ 113fd7c519dSJaroslav Kysela /* define initial 64-byte descriptor request timeout in milliseconds */ 114fd7c519dSJaroslav Kysela static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; 115fd7c519dSJaroslav Kysela module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); 116b9cef6c3SWu Fengguang MODULE_PARM_DESC(initial_descriptor_timeout, 117b9cef6c3SWu Fengguang "initial 64-byte descriptor request timeout in milliseconds " 118b9cef6c3SWu Fengguang "(default 5000 - 5.0 seconds)"); 119fd7c519dSJaroslav Kysela 120fd7c519dSJaroslav Kysela /* 1211da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 1221da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 1231da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 1241da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 1251da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 1261da177e4SLinus Torvalds * following module parameters. 1271da177e4SLinus Torvalds * 1281da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 1291da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 1301da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 1311da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 1321da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 1331da177e4SLinus Torvalds */ 1341da177e4SLinus Torvalds static int old_scheme_first = 0; 1351da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 1361da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 1371da177e4SLinus Torvalds "start with the old device initialization scheme"); 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds static int use_both_schemes = 1; 1401da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 1411da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 1421da177e4SLinus Torvalds "try the other device initialization scheme if the " 1431da177e4SLinus Torvalds "first one fails"); 1441da177e4SLinus Torvalds 14532fe0198SAlan Stern /* Mutual exclusion for EHCI CF initialization. This interferes with 14632fe0198SAlan Stern * port reset on some companion controllers. 14732fe0198SAlan Stern */ 14832fe0198SAlan Stern DECLARE_RWSEM(ehci_cf_port_reset_rwsem); 14932fe0198SAlan Stern EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); 15032fe0198SAlan Stern 151948fea37SAlan Stern #define HUB_DEBOUNCE_TIMEOUT 1500 152948fea37SAlan Stern #define HUB_DEBOUNCE_STEP 25 153948fea37SAlan Stern #define HUB_DEBOUNCE_STABLE 100 154948fea37SAlan Stern 1551da177e4SLinus Torvalds 156742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev); 157742120c6SMing Lei 158131dec34SSarah Sharp static inline char *portspeed(struct usb_hub *hub, int portstatus) 1591da177e4SLinus Torvalds { 160131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 161131dec34SSarah Sharp return "5.0 Gb/s"; 162288ead45SAlan Stern if (portstatus & USB_PORT_STAT_HIGH_SPEED) 1631da177e4SLinus Torvalds return "480 Mb/s"; 164288ead45SAlan Stern else if (portstatus & USB_PORT_STAT_LOW_SPEED) 1651da177e4SLinus Torvalds return "1.5 Mb/s"; 1661da177e4SLinus Torvalds else 1671da177e4SLinus Torvalds return "12 Mb/s"; 1681da177e4SLinus Torvalds } 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 17125118084SAlan Stern static struct usb_hub *hdev_to_hub(struct usb_device *hdev) 1721da177e4SLinus Torvalds { 17325118084SAlan Stern if (!hdev || !hdev->actconfig) 17425118084SAlan Stern return NULL; 1751da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1761da177e4SLinus Torvalds } 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 179dbe79bbeSJohn Youn static int get_hub_descriptor(struct usb_device *hdev, void *data) 1801da177e4SLinus Torvalds { 181dbe79bbeSJohn Youn int i, ret, size; 182dbe79bbeSJohn Youn unsigned dtype; 183dbe79bbeSJohn Youn 184dbe79bbeSJohn Youn if (hub_is_superspeed(hdev)) { 185dbe79bbeSJohn Youn dtype = USB_DT_SS_HUB; 186dbe79bbeSJohn Youn size = USB_DT_SS_HUB_SIZE; 187dbe79bbeSJohn Youn } else { 188dbe79bbeSJohn Youn dtype = USB_DT_HUB; 189dbe79bbeSJohn Youn size = sizeof(struct usb_hub_descriptor); 190dbe79bbeSJohn Youn } 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 1931da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 1941da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 195dbe79bbeSJohn Youn dtype << 8, 0, data, size, 1961da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 1971da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 1981da177e4SLinus Torvalds return ret; 1991da177e4SLinus Torvalds } 2001da177e4SLinus Torvalds return -EINVAL; 2011da177e4SLinus Torvalds } 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds /* 2041da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 2051da177e4SLinus Torvalds */ 2061da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 2071da177e4SLinus Torvalds { 2081da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 2091da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds /* 2131da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 2141da177e4SLinus Torvalds */ 2151da177e4SLinus Torvalds static int clear_port_feature(struct usb_device *hdev, int port1, int feature) 2161da177e4SLinus Torvalds { 2171da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 2181da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 2191da177e4SLinus Torvalds NULL, 0, 1000); 2201da177e4SLinus Torvalds } 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds /* 2231da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 2241da177e4SLinus Torvalds */ 2251da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 2261da177e4SLinus Torvalds { 2271da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 2281da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 2291da177e4SLinus Torvalds NULL, 0, 1000); 2301da177e4SLinus Torvalds } 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds /* 2331da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 2341da177e4SLinus Torvalds * for info about using port indicators 2351da177e4SLinus Torvalds */ 2361da177e4SLinus Torvalds static void set_port_led( 2371da177e4SLinus Torvalds struct usb_hub *hub, 2381da177e4SLinus Torvalds int port1, 2391da177e4SLinus Torvalds int selector 2401da177e4SLinus Torvalds ) 2411da177e4SLinus Torvalds { 2421da177e4SLinus Torvalds int status = set_port_feature(hub->hdev, (selector << 8) | port1, 2431da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 2441da177e4SLinus Torvalds if (status < 0) 2451da177e4SLinus Torvalds dev_dbg (hub->intfdev, 2461da177e4SLinus Torvalds "port %d indicator %s status %d\n", 2471da177e4SLinus Torvalds port1, 2481da177e4SLinus Torvalds ({ char *s; switch (selector) { 2491da177e4SLinus Torvalds case HUB_LED_AMBER: s = "amber"; break; 2501da177e4SLinus Torvalds case HUB_LED_GREEN: s = "green"; break; 2511da177e4SLinus Torvalds case HUB_LED_OFF: s = "off"; break; 2521da177e4SLinus Torvalds case HUB_LED_AUTO: s = "auto"; break; 2531da177e4SLinus Torvalds default: s = "??"; break; 2541da177e4SLinus Torvalds }; s; }), 2551da177e4SLinus Torvalds status); 2561da177e4SLinus Torvalds } 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 2591da177e4SLinus Torvalds 260c4028958SDavid Howells static void led_work (struct work_struct *work) 2611da177e4SLinus Torvalds { 262c4028958SDavid Howells struct usb_hub *hub = 263c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 2641da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 2651da177e4SLinus Torvalds unsigned i; 2661da177e4SLinus Torvalds unsigned changed = 0; 2671da177e4SLinus Torvalds int cursor = -1; 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 2701da177e4SLinus Torvalds return; 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds for (i = 0; i < hub->descriptor->bNbrPorts; i++) { 2731da177e4SLinus Torvalds unsigned selector, mode; 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds /* 30%-50% duty cycle */ 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds switch (hub->indicator[i]) { 2781da177e4SLinus Torvalds /* cycle marker */ 2791da177e4SLinus Torvalds case INDICATOR_CYCLE: 2801da177e4SLinus Torvalds cursor = i; 2811da177e4SLinus Torvalds selector = HUB_LED_AUTO; 2821da177e4SLinus Torvalds mode = INDICATOR_AUTO; 2831da177e4SLinus Torvalds break; 2841da177e4SLinus Torvalds /* blinking green = sw attention */ 2851da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 2861da177e4SLinus Torvalds selector = HUB_LED_GREEN; 2871da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 2881da177e4SLinus Torvalds break; 2891da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 2901da177e4SLinus Torvalds selector = HUB_LED_OFF; 2911da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 2921da177e4SLinus Torvalds break; 2931da177e4SLinus Torvalds /* blinking amber = hw attention */ 2941da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 2951da177e4SLinus Torvalds selector = HUB_LED_AMBER; 2961da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 2971da177e4SLinus Torvalds break; 2981da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 2991da177e4SLinus Torvalds selector = HUB_LED_OFF; 3001da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 3011da177e4SLinus Torvalds break; 3021da177e4SLinus Torvalds /* blink green/amber = reserved */ 3031da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 3041da177e4SLinus Torvalds selector = HUB_LED_GREEN; 3051da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 3061da177e4SLinus Torvalds break; 3071da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 3081da177e4SLinus Torvalds selector = HUB_LED_AMBER; 3091da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 3101da177e4SLinus Torvalds break; 3111da177e4SLinus Torvalds default: 3121da177e4SLinus Torvalds continue; 3131da177e4SLinus Torvalds } 3141da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 3151da177e4SLinus Torvalds changed = 1; 3161da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 3171da177e4SLinus Torvalds hub->indicator[i] = mode; 3181da177e4SLinus Torvalds } 3191da177e4SLinus Torvalds if (!changed && blinkenlights) { 3201da177e4SLinus Torvalds cursor++; 3211da177e4SLinus Torvalds cursor %= hub->descriptor->bNbrPorts; 3221da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 3231da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 3241da177e4SLinus Torvalds changed++; 3251da177e4SLinus Torvalds } 3261da177e4SLinus Torvalds if (changed) 3271da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 3281da177e4SLinus Torvalds } 3291da177e4SLinus Torvalds 3301da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 3311da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 3321da177e4SLinus Torvalds #define USB_STS_RETRIES 5 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvalds /* 3351da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 3361da177e4SLinus Torvalds */ 3371da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 3381da177e4SLinus Torvalds struct usb_hub_status *data) 3391da177e4SLinus Torvalds { 3401da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 3431da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3441da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 3451da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 3461da177e4SLinus Torvalds } 3471da177e4SLinus Torvalds return status; 3481da177e4SLinus Torvalds } 3491da177e4SLinus Torvalds 3501da177e4SLinus Torvalds /* 3511da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 3521da177e4SLinus Torvalds */ 3531da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 3541da177e4SLinus Torvalds struct usb_port_status *data) 3551da177e4SLinus Torvalds { 3561da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 3591da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3601da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 3611da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 3621da177e4SLinus Torvalds } 3631da177e4SLinus Torvalds return status; 3641da177e4SLinus Torvalds } 3651da177e4SLinus Torvalds 3663eb14915SAlan Stern static int hub_port_status(struct usb_hub *hub, int port1, 3673eb14915SAlan Stern u16 *status, u16 *change) 3683eb14915SAlan Stern { 3693eb14915SAlan Stern int ret; 3703eb14915SAlan Stern 3713eb14915SAlan Stern mutex_lock(&hub->status_mutex); 3723eb14915SAlan Stern ret = get_port_status(hub->hdev, port1, &hub->status->port); 3733eb14915SAlan Stern if (ret < 4) { 3743eb14915SAlan Stern dev_err(hub->intfdev, 3753eb14915SAlan Stern "%s failed (err = %d)\n", __func__, ret); 3763eb14915SAlan Stern if (ret >= 0) 3773eb14915SAlan Stern ret = -EIO; 3783eb14915SAlan Stern } else { 3793eb14915SAlan Stern *status = le16_to_cpu(hub->status->port.wPortStatus); 3803eb14915SAlan Stern *change = le16_to_cpu(hub->status->port.wPortChange); 381dbe79bbeSJohn Youn 382dbe79bbeSJohn Youn if ((hub->hdev->parent != NULL) && 383dbe79bbeSJohn Youn hub_is_superspeed(hub->hdev)) { 384dbe79bbeSJohn Youn /* Translate the USB 3 port status */ 385dbe79bbeSJohn Youn u16 tmp = *status & USB_SS_PORT_STAT_MASK; 386dbe79bbeSJohn Youn if (*status & USB_SS_PORT_STAT_POWER) 387dbe79bbeSJohn Youn tmp |= USB_PORT_STAT_POWER; 388dbe79bbeSJohn Youn *status = tmp; 389dbe79bbeSJohn Youn } 390dbe79bbeSJohn Youn 3913eb14915SAlan Stern ret = 0; 3923eb14915SAlan Stern } 3933eb14915SAlan Stern mutex_unlock(&hub->status_mutex); 3943eb14915SAlan Stern return ret; 3953eb14915SAlan Stern } 3963eb14915SAlan Stern 3971da177e4SLinus Torvalds static void kick_khubd(struct usb_hub *hub) 3981da177e4SLinus Torvalds { 3991da177e4SLinus Torvalds unsigned long flags; 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds spin_lock_irqsave(&hub_event_lock, flags); 4022e2c5eeaSRoel Kluin if (!hub->disconnected && list_empty(&hub->event_list)) { 4031da177e4SLinus Torvalds list_add_tail(&hub->event_list, &hub_event_list); 4048e4ceb38SAlan Stern 4058e4ceb38SAlan Stern /* Suppress autosuspend until khubd runs */ 4068e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 4078e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 4081da177e4SLinus Torvalds wake_up(&khubd_wait); 4091da177e4SLinus Torvalds } 4101da177e4SLinus Torvalds spin_unlock_irqrestore(&hub_event_lock, flags); 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds void usb_kick_khubd(struct usb_device *hdev) 4141da177e4SLinus Torvalds { 41525118084SAlan Stern struct usb_hub *hub = hdev_to_hub(hdev); 41625118084SAlan Stern 41725118084SAlan Stern if (hub) 41825118084SAlan Stern kick_khubd(hub); 4191da177e4SLinus Torvalds } 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 4237d12e780SDavid Howells static void hub_irq(struct urb *urb) 4241da177e4SLinus Torvalds { 425ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 426e015268dSAlan Stern int status = urb->status; 42771d2718fSRoel Kluin unsigned i; 4281da177e4SLinus Torvalds unsigned long bits; 4291da177e4SLinus Torvalds 430e015268dSAlan Stern switch (status) { 4311da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 4321da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 4331da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 4341da177e4SLinus Torvalds return; 4351da177e4SLinus Torvalds 4361da177e4SLinus Torvalds default: /* presumably an error */ 4371da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 438e015268dSAlan Stern dev_dbg (hub->intfdev, "transfer --> %d\n", status); 4391da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 4401da177e4SLinus Torvalds goto resubmit; 441e015268dSAlan Stern hub->error = status; 4421da177e4SLinus Torvalds /* FALL THROUGH */ 4431da177e4SLinus Torvalds 4441da177e4SLinus Torvalds /* let khubd handle things */ 4451da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 4461da177e4SLinus Torvalds bits = 0; 4471da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 4481da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 4491da177e4SLinus Torvalds << (i*8); 4501da177e4SLinus Torvalds hub->event_bits[0] = bits; 4511da177e4SLinus Torvalds break; 4521da177e4SLinus Torvalds } 4531da177e4SLinus Torvalds 4541da177e4SLinus Torvalds hub->nerrors = 0; 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds /* Something happened, let khubd figure it out */ 4571da177e4SLinus Torvalds kick_khubd(hub); 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds resubmit: 4601da177e4SLinus Torvalds if (hub->quiescing) 4611da177e4SLinus Torvalds return; 4621da177e4SLinus Torvalds 4631da177e4SLinus Torvalds if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 4641da177e4SLinus Torvalds && status != -ENODEV && status != -EPERM) 4651da177e4SLinus Torvalds dev_err (hub->intfdev, "resubmit --> %d\n", status); 4661da177e4SLinus Torvalds } 4671da177e4SLinus Torvalds 4681da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 4691da177e4SLinus Torvalds static inline int 4701da177e4SLinus Torvalds hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) 4711da177e4SLinus Torvalds { 472c2f6595fSAlan Stern return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4731da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 4741da177e4SLinus Torvalds tt, NULL, 0, 1000); 4751da177e4SLinus Torvalds } 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds /* 4781da177e4SLinus Torvalds * enumeration blocks khubd for a long time. we use keventd instead, since 4791da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 4801da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 4811da177e4SLinus Torvalds * both can talk to the same hub concurrently. 4821da177e4SLinus Torvalds */ 483cb88a1b8SAlan Stern static void hub_tt_work(struct work_struct *work) 4841da177e4SLinus Torvalds { 485c4028958SDavid Howells struct usb_hub *hub = 486cb88a1b8SAlan Stern container_of(work, struct usb_hub, tt.clear_work); 4871da177e4SLinus Torvalds unsigned long flags; 48855e5fdfaSMark Lord int limit = 100; 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 49155e5fdfaSMark Lord while (--limit && !list_empty (&hub->tt.clear_list)) { 492d0f830d3SH Hartley Sweeten struct list_head *next; 4931da177e4SLinus Torvalds struct usb_tt_clear *clear; 4941da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 495cb88a1b8SAlan Stern const struct hc_driver *drv; 4961da177e4SLinus Torvalds int status; 4971da177e4SLinus Torvalds 498d0f830d3SH Hartley Sweeten next = hub->tt.clear_list.next; 499d0f830d3SH Hartley Sweeten clear = list_entry (next, struct usb_tt_clear, clear_list); 5001da177e4SLinus Torvalds list_del (&clear->clear_list); 5011da177e4SLinus Torvalds 5021da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 5031da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 5041da177e4SLinus Torvalds status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 5051da177e4SLinus Torvalds if (status) 5061da177e4SLinus Torvalds dev_err (&hdev->dev, 5071da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 5081da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 509cb88a1b8SAlan Stern 510cb88a1b8SAlan Stern /* Tell the HCD, even if the operation failed */ 511cb88a1b8SAlan Stern drv = clear->hcd->driver; 512cb88a1b8SAlan Stern if (drv->clear_tt_buffer_complete) 513cb88a1b8SAlan Stern (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); 514cb88a1b8SAlan Stern 5151da177e4SLinus Torvalds kfree(clear); 516cb88a1b8SAlan Stern spin_lock_irqsave(&hub->tt.lock, flags); 5171da177e4SLinus Torvalds } 5181da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 5191da177e4SLinus Torvalds } 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds /** 522cb88a1b8SAlan Stern * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub 523cb88a1b8SAlan Stern * @urb: an URB associated with the failed or incomplete split transaction 5241da177e4SLinus Torvalds * 5251da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 5261da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 5271da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 5281da177e4SLinus Torvalds * interrupt context. 5291da177e4SLinus Torvalds * 5301da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 5311da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 5321da177e4SLinus Torvalds */ 533cb88a1b8SAlan Stern int usb_hub_clear_tt_buffer(struct urb *urb) 5341da177e4SLinus Torvalds { 535cb88a1b8SAlan Stern struct usb_device *udev = urb->dev; 536cb88a1b8SAlan Stern int pipe = urb->pipe; 5371da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 5381da177e4SLinus Torvalds unsigned long flags; 5391da177e4SLinus Torvalds struct usb_tt_clear *clear; 5401da177e4SLinus Torvalds 5411da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 5421da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 5431da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 5441da177e4SLinus Torvalds */ 54554e6ecb2SChristoph Lameter if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { 5461da177e4SLinus Torvalds dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 5471da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 548cb88a1b8SAlan Stern return -ENOMEM; 5491da177e4SLinus Torvalds } 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 5521da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 5531da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 5541da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 5551da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol (pipe) 5561da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 5571da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 5581da177e4SLinus Torvalds if (usb_pipein (pipe)) 5591da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 5601da177e4SLinus Torvalds 561cb88a1b8SAlan Stern /* info for completion callback */ 562cb88a1b8SAlan Stern clear->hcd = bus_to_hcd(udev->bus); 563cb88a1b8SAlan Stern clear->ep = urb->ep; 564cb88a1b8SAlan Stern 5651da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 5661da177e4SLinus Torvalds spin_lock_irqsave (&tt->lock, flags); 5671da177e4SLinus Torvalds list_add_tail (&clear->clear_list, &tt->clear_list); 568cb88a1b8SAlan Stern schedule_work(&tt->clear_work); 5691da177e4SLinus Torvalds spin_unlock_irqrestore (&tt->lock, flags); 570cb88a1b8SAlan Stern return 0; 5711da177e4SLinus Torvalds } 572cb88a1b8SAlan Stern EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); 5731da177e4SLinus Torvalds 5748520f380SAlan Stern /* If do_delay is false, return the number of milliseconds the caller 5758520f380SAlan Stern * needs to delay. 5768520f380SAlan Stern */ 5778520f380SAlan Stern static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) 5781da177e4SLinus Torvalds { 5791da177e4SLinus Torvalds int port1; 580b789696aSDavid Brownell unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 5818520f380SAlan Stern unsigned delay; 5824489a571SAlan Stern u16 wHubCharacteristics = 5834489a571SAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 5841da177e4SLinus Torvalds 5854489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 5864489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 5874489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 5884489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 5894489a571SAlan Stern * unless we send these messages to the hub. 5904489a571SAlan Stern */ 5914489a571SAlan Stern if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) 5921da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 5934489a571SAlan Stern else 5944489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 5954489a571SAlan Stern "non-switchable hub\n"); 5961da177e4SLinus Torvalds for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) 5974489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 5981da177e4SLinus Torvalds 599b789696aSDavid Brownell /* Wait at least 100 msec for power to become stable */ 6008520f380SAlan Stern delay = max(pgood_delay, (unsigned) 100); 6018520f380SAlan Stern if (do_delay) 6028520f380SAlan Stern msleep(delay); 6038520f380SAlan Stern return delay; 6041da177e4SLinus Torvalds } 6051da177e4SLinus Torvalds 6061da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 6071da177e4SLinus Torvalds u16 *status, u16 *change) 6081da177e4SLinus Torvalds { 6091da177e4SLinus Torvalds int ret; 6101da177e4SLinus Torvalds 611db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 6121da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 6131da177e4SLinus Torvalds if (ret < 0) 6141da177e4SLinus Torvalds dev_err (hub->intfdev, 615441b62c1SHarvey Harrison "%s failed (err = %d)\n", __func__, ret); 6161da177e4SLinus Torvalds else { 6171da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 6181da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 6191da177e4SLinus Torvalds ret = 0; 6201da177e4SLinus Torvalds } 621db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 6221da177e4SLinus Torvalds return ret; 6231da177e4SLinus Torvalds } 6241da177e4SLinus Torvalds 6258b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 6268b28c752SAlan Stern { 6278b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 6280458d5b4SAlan Stern int ret = 0; 6298b28c752SAlan Stern 6300458d5b4SAlan Stern if (hdev->children[port1-1] && set_state) 6318b28c752SAlan Stern usb_set_device_state(hdev->children[port1-1], 6328b28c752SAlan Stern USB_STATE_NOTATTACHED); 633dbe79bbeSJohn Youn if (!hub->error && !hub_is_superspeed(hub->hdev)) 6348b28c752SAlan Stern ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); 6358b28c752SAlan Stern if (ret) 6368b28c752SAlan Stern dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 6378b28c752SAlan Stern port1, ret); 6388b28c752SAlan Stern return ret; 6398b28c752SAlan Stern } 6408b28c752SAlan Stern 6410458d5b4SAlan Stern /* 6426d42fcdbSJustin P. Mattock * Disable a port and mark a logical connect-change event, so that some 6430458d5b4SAlan Stern * time later khubd will disconnect() any existing usb_device on the port 6440458d5b4SAlan Stern * and will re-enumerate if there actually is a device attached. 6450458d5b4SAlan Stern */ 6460458d5b4SAlan Stern static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 6477d069b7dSAlan Stern { 6480458d5b4SAlan Stern dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 6490458d5b4SAlan Stern hub_port_disable(hub, port1, 1); 6500458d5b4SAlan Stern 6510458d5b4SAlan Stern /* FIXME let caller ask to power down the port: 6520458d5b4SAlan Stern * - some devices won't enumerate without a VBUS power cycle 6530458d5b4SAlan Stern * - SRP saves power that way 6540458d5b4SAlan Stern * - ... new call, TBD ... 6550458d5b4SAlan Stern * That's easy if this hub can switch power per-port, and 6560458d5b4SAlan Stern * khubd reactivates the port later (timer, SRP, etc). 6570458d5b4SAlan Stern * Powerdown must be optional, because of reset/DFU. 6580458d5b4SAlan Stern */ 6590458d5b4SAlan Stern 6600458d5b4SAlan Stern set_bit(port1, hub->change_bits); 6610458d5b4SAlan Stern kick_khubd(hub); 6620458d5b4SAlan Stern } 6630458d5b4SAlan Stern 664253e0572SAlan Stern /** 665253e0572SAlan Stern * usb_remove_device - disable a device's port on its parent hub 666253e0572SAlan Stern * @udev: device to be disabled and removed 667253e0572SAlan Stern * Context: @udev locked, must be able to sleep. 668253e0572SAlan Stern * 669253e0572SAlan Stern * After @udev's port has been disabled, khubd is notified and it will 670253e0572SAlan Stern * see that the device has been disconnected. When the device is 671253e0572SAlan Stern * physically unplugged and something is plugged in, the events will 672253e0572SAlan Stern * be received and processed normally. 673253e0572SAlan Stern */ 674253e0572SAlan Stern int usb_remove_device(struct usb_device *udev) 675253e0572SAlan Stern { 676253e0572SAlan Stern struct usb_hub *hub; 677253e0572SAlan Stern struct usb_interface *intf; 678253e0572SAlan Stern 679253e0572SAlan Stern if (!udev->parent) /* Can't remove a root hub */ 680253e0572SAlan Stern return -EINVAL; 681253e0572SAlan Stern hub = hdev_to_hub(udev->parent); 682253e0572SAlan Stern intf = to_usb_interface(hub->intfdev); 683253e0572SAlan Stern 684253e0572SAlan Stern usb_autopm_get_interface(intf); 685253e0572SAlan Stern set_bit(udev->portnum, hub->removed_bits); 686253e0572SAlan Stern hub_port_logical_disconnect(hub, udev->portnum); 687253e0572SAlan Stern usb_autopm_put_interface(intf); 688253e0572SAlan Stern return 0; 689253e0572SAlan Stern } 690253e0572SAlan Stern 6916ee0b270SAlan Stern enum hub_activation_type { 6928e4ceb38SAlan Stern HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ 6938520f380SAlan Stern HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, 6946ee0b270SAlan Stern }; 6955e6effaeSAlan Stern 6968520f380SAlan Stern static void hub_init_func2(struct work_struct *ws); 6978520f380SAlan Stern static void hub_init_func3(struct work_struct *ws); 6988520f380SAlan Stern 699f2835219SAlan Stern static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) 7005e6effaeSAlan Stern { 7015e6effaeSAlan Stern struct usb_device *hdev = hub->hdev; 702653a39d1SSarah Sharp struct usb_hcd *hcd; 703653a39d1SSarah Sharp int ret; 7045e6effaeSAlan Stern int port1; 705f2835219SAlan Stern int status; 706948fea37SAlan Stern bool need_debounce_delay = false; 7078520f380SAlan Stern unsigned delay; 7088520f380SAlan Stern 7098520f380SAlan Stern /* Continue a partial initialization */ 7108520f380SAlan Stern if (type == HUB_INIT2) 7118520f380SAlan Stern goto init2; 7128520f380SAlan Stern if (type == HUB_INIT3) 7138520f380SAlan Stern goto init3; 7145e6effaeSAlan Stern 715f2835219SAlan Stern /* After a resume, port power should still be on. 716f2835219SAlan Stern * For any other type of activation, turn it on. 717f2835219SAlan Stern */ 7188520f380SAlan Stern if (type != HUB_RESUME) { 7198520f380SAlan Stern 7208520f380SAlan Stern /* Speed up system boot by using a delayed_work for the 7218520f380SAlan Stern * hub's initial power-up delays. This is pretty awkward 7228520f380SAlan Stern * and the implementation looks like a home-brewed sort of 7238520f380SAlan Stern * setjmp/longjmp, but it saves at least 100 ms for each 7248520f380SAlan Stern * root hub (assuming usbcore is compiled into the kernel 7258520f380SAlan Stern * rather than as a module). It adds up. 7268520f380SAlan Stern * 7278520f380SAlan Stern * This can't be done for HUB_RESUME or HUB_RESET_RESUME 7288520f380SAlan Stern * because for those activation types the ports have to be 7298520f380SAlan Stern * operational when we return. In theory this could be done 7308520f380SAlan Stern * for HUB_POST_RESET, but it's easier not to. 7318520f380SAlan Stern */ 7328520f380SAlan Stern if (type == HUB_INIT) { 7338520f380SAlan Stern delay = hub_power_on(hub, false); 7348520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); 7358520f380SAlan Stern schedule_delayed_work(&hub->init_work, 7368520f380SAlan Stern msecs_to_jiffies(delay)); 73761fbeba1SAlan Stern 73861fbeba1SAlan Stern /* Suppress autosuspend until init is done */ 7398e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 7408e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 7418520f380SAlan Stern return; /* Continues at init2: below */ 742653a39d1SSarah Sharp } else if (type == HUB_RESET_RESUME) { 743653a39d1SSarah Sharp /* The internal host controller state for the hub device 744653a39d1SSarah Sharp * may be gone after a host power loss on system resume. 745653a39d1SSarah Sharp * Update the device's info so the HW knows it's a hub. 746653a39d1SSarah Sharp */ 747653a39d1SSarah Sharp hcd = bus_to_hcd(hdev->bus); 748653a39d1SSarah Sharp if (hcd->driver->update_hub_device) { 749653a39d1SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 750653a39d1SSarah Sharp &hub->tt, GFP_NOIO); 751653a39d1SSarah Sharp if (ret < 0) { 752653a39d1SSarah Sharp dev_err(hub->intfdev, "Host not " 753653a39d1SSarah Sharp "accepting hub info " 754653a39d1SSarah Sharp "update.\n"); 755653a39d1SSarah Sharp dev_err(hub->intfdev, "LS/FS devices " 756653a39d1SSarah Sharp "and hubs may not work " 757653a39d1SSarah Sharp "under this hub\n."); 758653a39d1SSarah Sharp } 759653a39d1SSarah Sharp } 760653a39d1SSarah Sharp hub_power_on(hub, true); 7618520f380SAlan Stern } else { 7628520f380SAlan Stern hub_power_on(hub, true); 7638520f380SAlan Stern } 7648520f380SAlan Stern } 7658520f380SAlan Stern init2: 766f2835219SAlan Stern 7676ee0b270SAlan Stern /* Check each port and set hub->change_bits to let khubd know 7686ee0b270SAlan Stern * which ports need attention. 7695e6effaeSAlan Stern */ 7705e6effaeSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 7715e6effaeSAlan Stern struct usb_device *udev = hdev->children[port1-1]; 7725e6effaeSAlan Stern u16 portstatus, portchange; 7735e6effaeSAlan Stern 7746ee0b270SAlan Stern portstatus = portchange = 0; 7756ee0b270SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 7766ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 7776ee0b270SAlan Stern dev_dbg(hub->intfdev, 7786ee0b270SAlan Stern "port %d: status %04x change %04x\n", 7796ee0b270SAlan Stern port1, portstatus, portchange); 7805e6effaeSAlan Stern 7816ee0b270SAlan Stern /* After anything other than HUB_RESUME (i.e., initialization 7826ee0b270SAlan Stern * or any sort of reset), every port should be disabled. 7836ee0b270SAlan Stern * Unconnected ports should likewise be disabled (paranoia), 7846ee0b270SAlan Stern * and so should ports for which we have no usb_device. 7855e6effaeSAlan Stern */ 7866ee0b270SAlan Stern if ((portstatus & USB_PORT_STAT_ENABLE) && ( 7876ee0b270SAlan Stern type != HUB_RESUME || 7886ee0b270SAlan Stern !(portstatus & USB_PORT_STAT_CONNECTION) || 7896ee0b270SAlan Stern !udev || 7906ee0b270SAlan Stern udev->state == USB_STATE_NOTATTACHED)) { 7919f0a6cd3SAndiry Xu /* 7929f0a6cd3SAndiry Xu * USB3 protocol ports will automatically transition 7939f0a6cd3SAndiry Xu * to Enabled state when detect an USB3.0 device attach. 7949f0a6cd3SAndiry Xu * Do not disable USB3 protocol ports. 7959f0a6cd3SAndiry Xu */ 796131dec34SSarah Sharp if (!hub_is_superspeed(hdev)) { 7979f0a6cd3SAndiry Xu clear_port_feature(hdev, port1, 7989f0a6cd3SAndiry Xu USB_PORT_FEAT_ENABLE); 7996ee0b270SAlan Stern portstatus &= ~USB_PORT_STAT_ENABLE; 80085f0ff46SSarah Sharp } else { 80185f0ff46SSarah Sharp /* Pretend that power was lost for USB3 devs */ 80285f0ff46SSarah Sharp portstatus &= ~USB_PORT_STAT_ENABLE; 8036ee0b270SAlan Stern } 8049f0a6cd3SAndiry Xu } 8056ee0b270SAlan Stern 806948fea37SAlan Stern /* Clear status-change flags; we'll debounce later */ 807948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) { 808948fea37SAlan Stern need_debounce_delay = true; 809948fea37SAlan Stern clear_port_feature(hub->hdev, port1, 810948fea37SAlan Stern USB_PORT_FEAT_C_CONNECTION); 811948fea37SAlan Stern } 812948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) { 813948fea37SAlan Stern need_debounce_delay = true; 814948fea37SAlan Stern clear_port_feature(hub->hdev, port1, 815948fea37SAlan Stern USB_PORT_FEAT_C_ENABLE); 816948fea37SAlan Stern } 817dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_LINK_STATE) { 818dbe79bbeSJohn Youn need_debounce_delay = true; 819dbe79bbeSJohn Youn clear_port_feature(hub->hdev, port1, 820dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_LINK_STATE); 821dbe79bbeSJohn Youn } 822948fea37SAlan Stern 823253e0572SAlan Stern /* We can forget about a "removed" device when there's a 824253e0572SAlan Stern * physical disconnect or the connect status changes. 825253e0572SAlan Stern */ 826253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 827253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 828253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 829253e0572SAlan Stern 8306ee0b270SAlan Stern if (!udev || udev->state == USB_STATE_NOTATTACHED) { 8316ee0b270SAlan Stern /* Tell khubd to disconnect the device or 8326ee0b270SAlan Stern * check for a new connection 8336ee0b270SAlan Stern */ 8346ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 8356ee0b270SAlan Stern set_bit(port1, hub->change_bits); 8366ee0b270SAlan Stern 8376ee0b270SAlan Stern } else if (portstatus & USB_PORT_STAT_ENABLE) { 8386ee0b270SAlan Stern /* The power session apparently survived the resume. 8396ee0b270SAlan Stern * If there was an overcurrent or suspend change 8406ee0b270SAlan Stern * (i.e., remote wakeup request), have khubd 8416ee0b270SAlan Stern * take care of it. 8426ee0b270SAlan Stern */ 8436ee0b270SAlan Stern if (portchange) 8446ee0b270SAlan Stern set_bit(port1, hub->change_bits); 8456ee0b270SAlan Stern 8466ee0b270SAlan Stern } else if (udev->persist_enabled) { 8476ee0b270SAlan Stern #ifdef CONFIG_PM 8485e6effaeSAlan Stern udev->reset_resume = 1; 8496ee0b270SAlan Stern #endif 8508808f00cSAlan Stern set_bit(port1, hub->change_bits); 8518808f00cSAlan Stern 8526ee0b270SAlan Stern } else { 8536ee0b270SAlan Stern /* The power session is gone; tell khubd */ 8546ee0b270SAlan Stern usb_set_device_state(udev, USB_STATE_NOTATTACHED); 8556ee0b270SAlan Stern set_bit(port1, hub->change_bits); 8565e6effaeSAlan Stern } 8575e6effaeSAlan Stern } 8585e6effaeSAlan Stern 859948fea37SAlan Stern /* If no port-status-change flags were set, we don't need any 860948fea37SAlan Stern * debouncing. If flags were set we can try to debounce the 861948fea37SAlan Stern * ports all at once right now, instead of letting khubd do them 862948fea37SAlan Stern * one at a time later on. 863948fea37SAlan Stern * 864948fea37SAlan Stern * If any port-status changes do occur during this delay, khubd 865948fea37SAlan Stern * will see them later and handle them normally. 866948fea37SAlan Stern */ 8678520f380SAlan Stern if (need_debounce_delay) { 8688520f380SAlan Stern delay = HUB_DEBOUNCE_STABLE; 869f2835219SAlan Stern 8708520f380SAlan Stern /* Don't do a long sleep inside a workqueue routine */ 8718520f380SAlan Stern if (type == HUB_INIT2) { 8728520f380SAlan Stern PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); 8738520f380SAlan Stern schedule_delayed_work(&hub->init_work, 8748520f380SAlan Stern msecs_to_jiffies(delay)); 8758520f380SAlan Stern return; /* Continues at init3: below */ 8768520f380SAlan Stern } else { 8778520f380SAlan Stern msleep(delay); 8788520f380SAlan Stern } 8798520f380SAlan Stern } 8808520f380SAlan Stern init3: 881f2835219SAlan Stern hub->quiescing = 0; 882f2835219SAlan Stern 883f2835219SAlan Stern status = usb_submit_urb(hub->urb, GFP_NOIO); 884f2835219SAlan Stern if (status < 0) 885f2835219SAlan Stern dev_err(hub->intfdev, "activate --> %d\n", status); 886f2835219SAlan Stern if (hub->has_indicators && blinkenlights) 887f2835219SAlan Stern schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 888f2835219SAlan Stern 889f2835219SAlan Stern /* Scan all ports that need attention */ 890f2835219SAlan Stern kick_khubd(hub); 8918e4ceb38SAlan Stern 8928e4ceb38SAlan Stern /* Allow autosuspend if it was suppressed */ 8938e4ceb38SAlan Stern if (type <= HUB_INIT3) 8948e4ceb38SAlan Stern usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); 8955e6effaeSAlan Stern } 8965e6effaeSAlan Stern 8978520f380SAlan Stern /* Implement the continuations for the delays above */ 8988520f380SAlan Stern static void hub_init_func2(struct work_struct *ws) 8998520f380SAlan Stern { 9008520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 9018520f380SAlan Stern 9028520f380SAlan Stern hub_activate(hub, HUB_INIT2); 9038520f380SAlan Stern } 9048520f380SAlan Stern 9058520f380SAlan Stern static void hub_init_func3(struct work_struct *ws) 9068520f380SAlan Stern { 9078520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 9088520f380SAlan Stern 9098520f380SAlan Stern hub_activate(hub, HUB_INIT3); 9108520f380SAlan Stern } 9118520f380SAlan Stern 9124330354fSAlan Stern enum hub_quiescing_type { 9134330354fSAlan Stern HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND 9144330354fSAlan Stern }; 9154330354fSAlan Stern 9164330354fSAlan Stern static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) 9174330354fSAlan Stern { 9184330354fSAlan Stern struct usb_device *hdev = hub->hdev; 9194330354fSAlan Stern int i; 9204330354fSAlan Stern 9218520f380SAlan Stern cancel_delayed_work_sync(&hub->init_work); 9228520f380SAlan Stern 9234330354fSAlan Stern /* khubd and related activity won't re-trigger */ 9244330354fSAlan Stern hub->quiescing = 1; 9254330354fSAlan Stern 9264330354fSAlan Stern if (type != HUB_SUSPEND) { 9274330354fSAlan Stern /* Disconnect all the children */ 9284330354fSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 9294330354fSAlan Stern if (hdev->children[i]) 9304330354fSAlan Stern usb_disconnect(&hdev->children[i]); 9314330354fSAlan Stern } 9324330354fSAlan Stern } 9334330354fSAlan Stern 9344330354fSAlan Stern /* Stop khubd and related activity */ 9354330354fSAlan Stern usb_kill_urb(hub->urb); 9364330354fSAlan Stern if (hub->has_indicators) 9374330354fSAlan Stern cancel_delayed_work_sync(&hub->leds); 9384330354fSAlan Stern if (hub->tt.hub) 939cb88a1b8SAlan Stern cancel_work_sync(&hub->tt.clear_work); 9404330354fSAlan Stern } 9414330354fSAlan Stern 9423eb14915SAlan Stern /* caller has locked the hub device */ 9433eb14915SAlan Stern static int hub_pre_reset(struct usb_interface *intf) 9443eb14915SAlan Stern { 9453eb14915SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 9463eb14915SAlan Stern 9474330354fSAlan Stern hub_quiesce(hub, HUB_PRE_RESET); 948f07600cfSAlan Stern return 0; 9497d069b7dSAlan Stern } 9507d069b7dSAlan Stern 9517d069b7dSAlan Stern /* caller has locked the hub device */ 952f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 9537d069b7dSAlan Stern { 9547de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 9557de18d8bSAlan Stern 956f2835219SAlan Stern hub_activate(hub, HUB_POST_RESET); 957f07600cfSAlan Stern return 0; 9587d069b7dSAlan Stern } 9597d069b7dSAlan Stern 9601da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 9611da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 9621da177e4SLinus Torvalds { 963b356b7c7SSarah Sharp struct usb_hcd *hcd; 9641da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 9651da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 9661da177e4SLinus Torvalds u16 hubstatus, hubchange; 96774ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 9681da177e4SLinus Torvalds unsigned int pipe; 9691da177e4SLinus Torvalds int maxp, ret; 9707cbe5dcaSAlan Stern char *message = "out of memory"; 9711da177e4SLinus Torvalds 972d697cddaSAlan Stern hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); 9731da177e4SLinus Torvalds if (!hub->buffer) { 9741da177e4SLinus Torvalds ret = -ENOMEM; 9751da177e4SLinus Torvalds goto fail; 9761da177e4SLinus Torvalds } 9771da177e4SLinus Torvalds 9781da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 9791da177e4SLinus Torvalds if (!hub->status) { 9801da177e4SLinus Torvalds ret = -ENOMEM; 9811da177e4SLinus Torvalds goto fail; 9821da177e4SLinus Torvalds } 983db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 9841da177e4SLinus Torvalds 9851da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 9861da177e4SLinus Torvalds if (!hub->descriptor) { 9871da177e4SLinus Torvalds ret = -ENOMEM; 9881da177e4SLinus Torvalds goto fail; 9891da177e4SLinus Torvalds } 9901da177e4SLinus Torvalds 991dbe79bbeSJohn Youn if (hub_is_superspeed(hdev) && (hdev->parent != NULL)) { 992dbe79bbeSJohn Youn ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 993dbe79bbeSJohn Youn HUB_SET_DEPTH, USB_RT_HUB, 994dbe79bbeSJohn Youn hdev->level - 1, 0, NULL, 0, 995dbe79bbeSJohn Youn USB_CTRL_SET_TIMEOUT); 996dbe79bbeSJohn Youn 997dbe79bbeSJohn Youn if (ret < 0) { 998dbe79bbeSJohn Youn message = "can't set hub depth"; 999dbe79bbeSJohn Youn goto fail; 1000dbe79bbeSJohn Youn } 1001dbe79bbeSJohn Youn } 1002dbe79bbeSJohn Youn 10031da177e4SLinus Torvalds /* Request the entire hub descriptor. 10041da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 10051da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 10061da177e4SLinus Torvalds */ 1007dbe79bbeSJohn Youn ret = get_hub_descriptor(hdev, hub->descriptor); 10081da177e4SLinus Torvalds if (ret < 0) { 10091da177e4SLinus Torvalds message = "can't read hub descriptor"; 10101da177e4SLinus Torvalds goto fail; 10111da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 10121da177e4SLinus Torvalds message = "hub has too many ports!"; 10131da177e4SLinus Torvalds ret = -ENODEV; 10141da177e4SLinus Torvalds goto fail; 10151da177e4SLinus Torvalds } 10161da177e4SLinus Torvalds 10171da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 10181da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 10191da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 10201da177e4SLinus Torvalds 10217cbe5dcaSAlan Stern hub->port_owners = kzalloc(hdev->maxchild * sizeof(void *), GFP_KERNEL); 10227cbe5dcaSAlan Stern if (!hub->port_owners) { 10237cbe5dcaSAlan Stern ret = -ENOMEM; 10247cbe5dcaSAlan Stern goto fail; 10257cbe5dcaSAlan Stern } 10267cbe5dcaSAlan Stern 102774ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 10281da177e4SLinus Torvalds 1029dbe79bbeSJohn Youn /* FIXME for USB 3.0, skip for now */ 1030dbe79bbeSJohn Youn if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && 1031dbe79bbeSJohn Youn !(hub_is_superspeed(hdev))) { 10321da177e4SLinus Torvalds int i; 10331da177e4SLinus Torvalds char portstr [USB_MAXCHILDREN + 1]; 10341da177e4SLinus Torvalds 10351da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 1036dbe79bbeSJohn Youn portstr[i] = hub->descriptor->u.hs.DeviceRemovable 10371da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 10381da177e4SLinus Torvalds ? 'F' : 'R'; 10391da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 10401da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 10411da177e4SLinus Torvalds } else 10421da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 10431da177e4SLinus Torvalds 104474ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 10451da177e4SLinus Torvalds case 0x00: 10461da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 10471da177e4SLinus Torvalds break; 10481da177e4SLinus Torvalds case 0x01: 10491da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 10501da177e4SLinus Torvalds break; 10511da177e4SLinus Torvalds case 0x02: 10521da177e4SLinus Torvalds case 0x03: 10531da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 10541da177e4SLinus Torvalds break; 10551da177e4SLinus Torvalds } 10561da177e4SLinus Torvalds 105774ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 10581da177e4SLinus Torvalds case 0x00: 10591da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 10601da177e4SLinus Torvalds break; 10611da177e4SLinus Torvalds case 0x08: 10621da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 10631da177e4SLinus Torvalds break; 10641da177e4SLinus Torvalds case 0x10: 10651da177e4SLinus Torvalds case 0x18: 10661da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 10671da177e4SLinus Torvalds break; 10681da177e4SLinus Torvalds } 10691da177e4SLinus Torvalds 10701da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 10711da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 1072cb88a1b8SAlan Stern INIT_WORK(&hub->tt.clear_work, hub_tt_work); 10731da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 10741da177e4SLinus Torvalds case 0: 10751da177e4SLinus Torvalds break; 10761da177e4SLinus Torvalds case 1: 10771da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 10781da177e4SLinus Torvalds hub->tt.hub = hdev; 10791da177e4SLinus Torvalds break; 10801da177e4SLinus Torvalds case 2: 10811da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 10821da177e4SLinus Torvalds if (ret == 0) { 10831da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 10841da177e4SLinus Torvalds hub->tt.multi = 1; 10851da177e4SLinus Torvalds } else 10861da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 10871da177e4SLinus Torvalds ret); 10881da177e4SLinus Torvalds hub->tt.hub = hdev; 10891da177e4SLinus Torvalds break; 1090d2e9b4d6SSarah Sharp case 3: 1091d2e9b4d6SSarah Sharp /* USB 3.0 hubs don't have a TT */ 1092d2e9b4d6SSarah Sharp break; 10931da177e4SLinus Torvalds default: 10941da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 10951da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 10961da177e4SLinus Torvalds break; 10971da177e4SLinus Torvalds } 10981da177e4SLinus Torvalds 1099e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 110074ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 1101e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 1102e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 1103e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 1104e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1105e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1106e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 1107e09711aeSdavid-b@pacbell.net } 11081da177e4SLinus Torvalds break; 1109e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 1110e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 1111e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1112e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1113e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 11141da177e4SLinus Torvalds break; 1115e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 1116e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 1117e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1118e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1119e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 11201da177e4SLinus Torvalds break; 1121e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 1122e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 1123e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1124e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1125e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 11261da177e4SLinus Torvalds break; 11271da177e4SLinus Torvalds } 11281da177e4SLinus Torvalds 11291da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 113074ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 11311da177e4SLinus Torvalds hub->has_indicators = 1; 11321da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 11331da177e4SLinus Torvalds } 11341da177e4SLinus Torvalds 11351da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 11361da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 11371da177e4SLinus Torvalds 11381da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 11391da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 11401da177e4SLinus Torvalds */ 11411da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 114255c52718SAlan Stern if (ret < 2) { 11431da177e4SLinus Torvalds message = "can't get hub status"; 11441da177e4SLinus Torvalds goto fail; 11451da177e4SLinus Torvalds } 11467d35b929SAlan Stern le16_to_cpus(&hubstatus); 11477d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 114855c52718SAlan Stern if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) 114955c52718SAlan Stern hub->mA_per_port = 500; 115055c52718SAlan Stern else { 115155c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 115255c52718SAlan Stern hub->limited_power = 1; 115355c52718SAlan Stern } 11547d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 11551da177e4SLinus Torvalds dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 11561da177e4SLinus Torvalds hub->descriptor->bHubContrCurrent); 115755c52718SAlan Stern hub->limited_power = 1; 115855c52718SAlan Stern if (hdev->maxchild > 0) { 115955c52718SAlan Stern int remaining = hdev->bus_mA - 116055c52718SAlan Stern hub->descriptor->bHubContrCurrent; 11611da177e4SLinus Torvalds 116255c52718SAlan Stern if (remaining < hdev->maxchild * 100) 116355c52718SAlan Stern dev_warn(hub_dev, 116455c52718SAlan Stern "insufficient power available " 116555c52718SAlan Stern "to use all downstream ports\n"); 116655c52718SAlan Stern hub->mA_per_port = 100; /* 7.2.1.1 */ 116755c52718SAlan Stern } 116855c52718SAlan Stern } else { /* Self-powered external hub */ 116955c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 117055c52718SAlan Stern * provide less current per port? */ 117155c52718SAlan Stern hub->mA_per_port = 500; 117255c52718SAlan Stern } 117355c52718SAlan Stern if (hub->mA_per_port < 500) 117455c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 117555c52718SAlan Stern hub->mA_per_port); 11761da177e4SLinus Torvalds 1177b356b7c7SSarah Sharp /* Update the HCD's internal representation of this hub before khubd 1178b356b7c7SSarah Sharp * starts getting port status changes for devices under the hub. 1179b356b7c7SSarah Sharp */ 1180b356b7c7SSarah Sharp hcd = bus_to_hcd(hdev->bus); 1181b356b7c7SSarah Sharp if (hcd->driver->update_hub_device) { 1182b356b7c7SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1183b356b7c7SSarah Sharp &hub->tt, GFP_KERNEL); 1184b356b7c7SSarah Sharp if (ret < 0) { 1185b356b7c7SSarah Sharp message = "can't update HCD hub info"; 1186b356b7c7SSarah Sharp goto fail; 1187b356b7c7SSarah Sharp } 1188b356b7c7SSarah Sharp } 1189b356b7c7SSarah Sharp 11901da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 11911da177e4SLinus Torvalds if (ret < 0) { 11921da177e4SLinus Torvalds message = "can't get hub status"; 11931da177e4SLinus Torvalds goto fail; 11941da177e4SLinus Torvalds } 11951da177e4SLinus Torvalds 11961da177e4SLinus Torvalds /* local power status reports aren't always correct */ 11971da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 11981da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 11991da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 12001da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 12011da177e4SLinus Torvalds 120274ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 12031da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 12041da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 12051da177e4SLinus Torvalds 120688fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 120788fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 120888fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 120988fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 121088fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 121188fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 12121da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 12131da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 12141da177e4SLinus Torvalds 12151da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 12161da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 12171da177e4SLinus Torvalds 12181da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 12191da177e4SLinus Torvalds if (!hub->urb) { 12201da177e4SLinus Torvalds ret = -ENOMEM; 12211da177e4SLinus Torvalds goto fail; 12221da177e4SLinus Torvalds } 12231da177e4SLinus Torvalds 12241da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 12251da177e4SLinus Torvalds hub, endpoint->bInterval); 12261da177e4SLinus Torvalds 12271da177e4SLinus Torvalds /* maybe cycle the hub leds */ 12281da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 12291da177e4SLinus Torvalds hub->indicator [0] = INDICATOR_CYCLE; 12301da177e4SLinus Torvalds 1231f2835219SAlan Stern hub_activate(hub, HUB_INIT); 12321da177e4SLinus Torvalds return 0; 12331da177e4SLinus Torvalds 12341da177e4SLinus Torvalds fail: 12351da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 12361da177e4SLinus Torvalds message, ret); 12371da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 12381da177e4SLinus Torvalds return ret; 12391da177e4SLinus Torvalds } 12401da177e4SLinus Torvalds 1241e8054854SAlan Stern static void hub_release(struct kref *kref) 1242e8054854SAlan Stern { 1243e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 1244e8054854SAlan Stern 1245e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 1246e8054854SAlan Stern kfree(hub); 1247e8054854SAlan Stern } 1248e8054854SAlan Stern 12491da177e4SLinus Torvalds static unsigned highspeed_hubs; 12501da177e4SLinus Torvalds 12511da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 12521da177e4SLinus Torvalds { 12531da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 1254e8054854SAlan Stern 1255e8054854SAlan Stern /* Take the hub off the event list and don't let it be added again */ 1256e8054854SAlan Stern spin_lock_irq(&hub_event_lock); 12578e4ceb38SAlan Stern if (!list_empty(&hub->event_list)) { 1258e8054854SAlan Stern list_del_init(&hub->event_list); 12598e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 12608e4ceb38SAlan Stern } 1261e8054854SAlan Stern hub->disconnected = 1; 1262e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 12631da177e4SLinus Torvalds 12647de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 12657de18d8bSAlan Stern hub->error = 0; 12664330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 12677de18d8bSAlan Stern 12688b28c752SAlan Stern usb_set_intfdata (intf, NULL); 12697cbe5dcaSAlan Stern hub->hdev->maxchild = 0; 12701da177e4SLinus Torvalds 1271e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 12721da177e4SLinus Torvalds highspeed_hubs--; 12731da177e4SLinus Torvalds 12741da177e4SLinus Torvalds usb_free_urb(hub->urb); 12757cbe5dcaSAlan Stern kfree(hub->port_owners); 12761da177e4SLinus Torvalds kfree(hub->descriptor); 12771da177e4SLinus Torvalds kfree(hub->status); 1278d697cddaSAlan Stern kfree(hub->buffer); 12791da177e4SLinus Torvalds 1280e8054854SAlan Stern kref_put(&hub->kref, hub_release); 12811da177e4SLinus Torvalds } 12821da177e4SLinus Torvalds 12831da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 12841da177e4SLinus Torvalds { 12851da177e4SLinus Torvalds struct usb_host_interface *desc; 12861da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 12871da177e4SLinus Torvalds struct usb_device *hdev; 12881da177e4SLinus Torvalds struct usb_hub *hub; 12891da177e4SLinus Torvalds 12901da177e4SLinus Torvalds desc = intf->cur_altsetting; 12911da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 12921da177e4SLinus Torvalds 12930c9ffe0fSSarah Sharp /* Hubs have proper suspend/resume support. USB 3.0 device suspend is 12940c9ffe0fSSarah Sharp * different from USB 2.0/1.1 device suspend, and unfortunately we 12950c9ffe0fSSarah Sharp * don't support it yet. So leave autosuspend disabled for USB 3.0 12960c9ffe0fSSarah Sharp * external hubs for now. Enable autosuspend for USB 3.0 roothubs, 12970c9ffe0fSSarah Sharp * since that isn't a "real" hub. 12980c9ffe0fSSarah Sharp */ 12990c9ffe0fSSarah Sharp if (!hub_is_superspeed(hdev) || !hdev->parent) 1300088f7fecSAlan Stern usb_enable_autosuspend(hdev); 1301088f7fecSAlan Stern 130238f3ad5eSFelipe Balbi if (hdev->level == MAX_TOPO_LEVEL) { 1303b9cef6c3SWu Fengguang dev_err(&intf->dev, 1304b9cef6c3SWu Fengguang "Unsupported bus topology: hub nested too deep\n"); 130538f3ad5eSFelipe Balbi return -E2BIG; 130638f3ad5eSFelipe Balbi } 130738f3ad5eSFelipe Balbi 130889ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 130989ccbdc9SDavid Brownell if (hdev->parent) { 131089ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 131189ccbdc9SDavid Brownell return -ENODEV; 131289ccbdc9SDavid Brownell } 131389ccbdc9SDavid Brownell #endif 131489ccbdc9SDavid Brownell 13151da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 13161da177e4SLinus Torvalds /* specs is not defined, but it works */ 13171da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 13181da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 13191da177e4SLinus Torvalds descriptor_error: 13201da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 13211da177e4SLinus Torvalds return -EIO; 13221da177e4SLinus Torvalds } 13231da177e4SLinus Torvalds 13241da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 13251da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 13261da177e4SLinus Torvalds goto descriptor_error; 13271da177e4SLinus Torvalds 13281da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 13291da177e4SLinus Torvalds 1330fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 1331fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 13321da177e4SLinus Torvalds goto descriptor_error; 13331da177e4SLinus Torvalds 13341da177e4SLinus Torvalds /* We found a hub */ 13351da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 13361da177e4SLinus Torvalds 13370a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 13381da177e4SLinus Torvalds if (!hub) { 13391da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 13401da177e4SLinus Torvalds return -ENOMEM; 13411da177e4SLinus Torvalds } 13421da177e4SLinus Torvalds 1343e8054854SAlan Stern kref_init(&hub->kref); 13441da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 13451da177e4SLinus Torvalds hub->intfdev = &intf->dev; 13461da177e4SLinus Torvalds hub->hdev = hdev; 1347c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 13488520f380SAlan Stern INIT_DELAYED_WORK(&hub->init_work, NULL); 1349e8054854SAlan Stern usb_get_intf(intf); 13501da177e4SLinus Torvalds 13511da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 135240f122f3SAlan Stern intf->needs_remote_wakeup = 1; 13531da177e4SLinus Torvalds 13541da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 13551da177e4SLinus Torvalds highspeed_hubs++; 13561da177e4SLinus Torvalds 13571da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 13581da177e4SLinus Torvalds return 0; 13591da177e4SLinus Torvalds 13601da177e4SLinus Torvalds hub_disconnect (intf); 13611da177e4SLinus Torvalds return -ENODEV; 13621da177e4SLinus Torvalds } 13631da177e4SLinus Torvalds 1364c532b29aSAndi Kleen /* No BKL needed */ 13651da177e4SLinus Torvalds static int 13661da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 13671da177e4SLinus Torvalds { 13681da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 13691da177e4SLinus Torvalds 13701da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 13711da177e4SLinus Torvalds switch (code) { 13721da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 13731da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 13741da177e4SLinus Torvalds int i; 13751da177e4SLinus Torvalds 13761da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 13771da177e4SLinus Torvalds if (hdev->devnum <= 0) 13781da177e4SLinus Torvalds info->nports = 0; 13791da177e4SLinus Torvalds else { 13801da177e4SLinus Torvalds info->nports = hdev->maxchild; 13811da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 13821da177e4SLinus Torvalds if (hdev->children[i] == NULL) 13831da177e4SLinus Torvalds info->port[i] = 0; 13841da177e4SLinus Torvalds else 13851da177e4SLinus Torvalds info->port[i] = 13861da177e4SLinus Torvalds hdev->children[i]->devnum; 13871da177e4SLinus Torvalds } 13881da177e4SLinus Torvalds } 13891da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 13901da177e4SLinus Torvalds 13911da177e4SLinus Torvalds return info->nports + 1; 13921da177e4SLinus Torvalds } 13931da177e4SLinus Torvalds 13941da177e4SLinus Torvalds default: 13951da177e4SLinus Torvalds return -ENOSYS; 13961da177e4SLinus Torvalds } 13971da177e4SLinus Torvalds } 13981da177e4SLinus Torvalds 13997cbe5dcaSAlan Stern /* 14007cbe5dcaSAlan Stern * Allow user programs to claim ports on a hub. When a device is attached 14017cbe5dcaSAlan Stern * to one of these "claimed" ports, the program will "own" the device. 14027cbe5dcaSAlan Stern */ 14037cbe5dcaSAlan Stern static int find_port_owner(struct usb_device *hdev, unsigned port1, 14047cbe5dcaSAlan Stern void ***ppowner) 14057cbe5dcaSAlan Stern { 14067cbe5dcaSAlan Stern if (hdev->state == USB_STATE_NOTATTACHED) 14077cbe5dcaSAlan Stern return -ENODEV; 14087cbe5dcaSAlan Stern if (port1 == 0 || port1 > hdev->maxchild) 14097cbe5dcaSAlan Stern return -EINVAL; 14107cbe5dcaSAlan Stern 14117cbe5dcaSAlan Stern /* This assumes that devices not managed by the hub driver 14127cbe5dcaSAlan Stern * will always have maxchild equal to 0. 14137cbe5dcaSAlan Stern */ 14147cbe5dcaSAlan Stern *ppowner = &(hdev_to_hub(hdev)->port_owners[port1 - 1]); 14157cbe5dcaSAlan Stern return 0; 14167cbe5dcaSAlan Stern } 14177cbe5dcaSAlan Stern 14187cbe5dcaSAlan Stern /* In the following three functions, the caller must hold hdev's lock */ 14197cbe5dcaSAlan Stern int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, void *owner) 14207cbe5dcaSAlan Stern { 14217cbe5dcaSAlan Stern int rc; 14227cbe5dcaSAlan Stern void **powner; 14237cbe5dcaSAlan Stern 14247cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 14257cbe5dcaSAlan Stern if (rc) 14267cbe5dcaSAlan Stern return rc; 14277cbe5dcaSAlan Stern if (*powner) 14287cbe5dcaSAlan Stern return -EBUSY; 14297cbe5dcaSAlan Stern *powner = owner; 14307cbe5dcaSAlan Stern return rc; 14317cbe5dcaSAlan Stern } 14327cbe5dcaSAlan Stern 14337cbe5dcaSAlan Stern int usb_hub_release_port(struct usb_device *hdev, unsigned port1, void *owner) 14347cbe5dcaSAlan Stern { 14357cbe5dcaSAlan Stern int rc; 14367cbe5dcaSAlan Stern void **powner; 14377cbe5dcaSAlan Stern 14387cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 14397cbe5dcaSAlan Stern if (rc) 14407cbe5dcaSAlan Stern return rc; 14417cbe5dcaSAlan Stern if (*powner != owner) 14427cbe5dcaSAlan Stern return -ENOENT; 14437cbe5dcaSAlan Stern *powner = NULL; 14447cbe5dcaSAlan Stern return rc; 14457cbe5dcaSAlan Stern } 14467cbe5dcaSAlan Stern 14477cbe5dcaSAlan Stern void usb_hub_release_all_ports(struct usb_device *hdev, void *owner) 14487cbe5dcaSAlan Stern { 14497cbe5dcaSAlan Stern int n; 14507cbe5dcaSAlan Stern void **powner; 14517cbe5dcaSAlan Stern 14527cbe5dcaSAlan Stern n = find_port_owner(hdev, 1, &powner); 14537cbe5dcaSAlan Stern if (n == 0) { 14547cbe5dcaSAlan Stern for (; n < hdev->maxchild; (++n, ++powner)) { 14557cbe5dcaSAlan Stern if (*powner == owner) 14567cbe5dcaSAlan Stern *powner = NULL; 14577cbe5dcaSAlan Stern } 14587cbe5dcaSAlan Stern } 14597cbe5dcaSAlan Stern } 14607cbe5dcaSAlan Stern 14617cbe5dcaSAlan Stern /* The caller must hold udev's lock */ 14627cbe5dcaSAlan Stern bool usb_device_is_owned(struct usb_device *udev) 14637cbe5dcaSAlan Stern { 14647cbe5dcaSAlan Stern struct usb_hub *hub; 14657cbe5dcaSAlan Stern 14667cbe5dcaSAlan Stern if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) 14677cbe5dcaSAlan Stern return false; 14687cbe5dcaSAlan Stern hub = hdev_to_hub(udev->parent); 14697cbe5dcaSAlan Stern return !!hub->port_owners[udev->portnum - 1]; 14707cbe5dcaSAlan Stern } 14717cbe5dcaSAlan Stern 14721da177e4SLinus Torvalds 14731da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 14741da177e4SLinus Torvalds { 14751da177e4SLinus Torvalds int i; 14761da177e4SLinus Torvalds 14771da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 14781da177e4SLinus Torvalds if (udev->children[i]) 14791da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev->children[i]); 14801da177e4SLinus Torvalds } 14819bbdf1e0SAlan Stern if (udev->state == USB_STATE_SUSPENDED) 148215123006SSarah Sharp udev->active_duration -= jiffies; 14831da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 14841da177e4SLinus Torvalds } 14851da177e4SLinus Torvalds 14861da177e4SLinus Torvalds /** 14871da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 14881da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 14891da177e4SLinus Torvalds * @new_state: new state value to be stored 14901da177e4SLinus Torvalds * 14911da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 14921da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 14931da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 14941da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 14951da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 14961da177e4SLinus Torvalds * all changes to any device's state must be protected by the 14971da177e4SLinus Torvalds * device_state_lock spinlock. 14981da177e4SLinus Torvalds * 14991da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 15001da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 15011da177e4SLinus Torvalds * 15021da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 15031da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 15041da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 15051da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 15061da177e4SLinus Torvalds */ 15071da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 15081da177e4SLinus Torvalds enum usb_device_state new_state) 15091da177e4SLinus Torvalds { 15101da177e4SLinus Torvalds unsigned long flags; 15111da177e4SLinus Torvalds 15121da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 15131da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 15141da177e4SLinus Torvalds ; /* do nothing */ 1515b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1516fb669cc0SDavid Brownell 1517fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1518fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1519fb669cc0SDavid Brownell */ 1520fb669cc0SDavid Brownell if (udev->parent) { 1521645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1522645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1523645daaabSAlan Stern ; /* No change to wakeup settings */ 1524645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 152516985408SDan Streetman device_set_wakeup_capable(&udev->dev, 1526b94dc6b5SDavid Brownell (udev->actconfig->desc.bmAttributes 1527b94dc6b5SDavid Brownell & USB_CONFIG_ATT_WAKEUP)); 1528645daaabSAlan Stern else 152916985408SDan Streetman device_set_wakeup_capable(&udev->dev, 0); 1530fb669cc0SDavid Brownell } 153115123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED && 153215123006SSarah Sharp new_state != USB_STATE_SUSPENDED) 153315123006SSarah Sharp udev->active_duration -= jiffies; 153415123006SSarah Sharp else if (new_state == USB_STATE_SUSPENDED && 153515123006SSarah Sharp udev->state != USB_STATE_SUSPENDED) 153615123006SSarah Sharp udev->active_duration += jiffies; 1537645daaabSAlan Stern udev->state = new_state; 1538b94dc6b5SDavid Brownell } else 15391da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 15401da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 15411da177e4SLinus Torvalds } 15426da9c990SDavid Vrabel EXPORT_SYMBOL_GPL(usb_set_device_state); 15431da177e4SLinus Torvalds 15448af548dcSInaky Perez-Gonzalez /* 15453b29b68bSAlan Stern * Choose a device number. 15463b29b68bSAlan Stern * 15473b29b68bSAlan Stern * Device numbers are used as filenames in usbfs. On USB-1.1 and 15483b29b68bSAlan Stern * USB-2.0 buses they are also used as device addresses, however on 15493b29b68bSAlan Stern * USB-3.0 buses the address is assigned by the controller hardware 15503b29b68bSAlan Stern * and it usually is not the same as the device number. 15513b29b68bSAlan Stern * 15528af548dcSInaky Perez-Gonzalez * WUSB devices are simple: they have no hubs behind, so the mapping 15538af548dcSInaky Perez-Gonzalez * device <-> virtual port number becomes 1:1. Why? to simplify the 15548af548dcSInaky Perez-Gonzalez * life of the device connection logic in 15558af548dcSInaky Perez-Gonzalez * drivers/usb/wusbcore/devconnect.c. When we do the initial secret 15568af548dcSInaky Perez-Gonzalez * handshake we need to assign a temporary address in the unauthorized 15578af548dcSInaky Perez-Gonzalez * space. For simplicity we use the first virtual port number found to 15588af548dcSInaky Perez-Gonzalez * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] 15598af548dcSInaky Perez-Gonzalez * and that becomes it's address [X < 128] or its unauthorized address 15608af548dcSInaky Perez-Gonzalez * [X | 0x80]. 15618af548dcSInaky Perez-Gonzalez * 15628af548dcSInaky Perez-Gonzalez * We add 1 as an offset to the one-based USB-stack port number 15638af548dcSInaky Perez-Gonzalez * (zero-based wusb virtual port index) for two reasons: (a) dev addr 15648af548dcSInaky Perez-Gonzalez * 0 is reserved by USB for default address; (b) Linux's USB stack 15658af548dcSInaky Perez-Gonzalez * uses always #1 for the root hub of the controller. So USB stack's 15668af548dcSInaky Perez-Gonzalez * port #1, which is wusb virtual-port #0 has address #2. 1567c6515272SSarah Sharp * 1568c6515272SSarah Sharp * Devices connected under xHCI are not as simple. The host controller 1569c6515272SSarah Sharp * supports virtualization, so the hardware assigns device addresses and 1570c6515272SSarah Sharp * the HCD must setup data structures before issuing a set address 1571c6515272SSarah Sharp * command to the hardware. 15728af548dcSInaky Perez-Gonzalez */ 15733b29b68bSAlan Stern static void choose_devnum(struct usb_device *udev) 15741da177e4SLinus Torvalds { 15751da177e4SLinus Torvalds int devnum; 15761da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 15771da177e4SLinus Torvalds 15781da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 15798af548dcSInaky Perez-Gonzalez if (udev->wusb) { 15808af548dcSInaky Perez-Gonzalez devnum = udev->portnum + 1; 15818af548dcSInaky Perez-Gonzalez BUG_ON(test_bit(devnum, bus->devmap.devicemap)); 15828af548dcSInaky Perez-Gonzalez } else { 15838af548dcSInaky Perez-Gonzalez /* Try to allocate the next devnum beginning at 15848af548dcSInaky Perez-Gonzalez * bus->devnum_next. */ 15851da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 15861da177e4SLinus Torvalds bus->devnum_next); 15871da177e4SLinus Torvalds if (devnum >= 128) 15888af548dcSInaky Perez-Gonzalez devnum = find_next_zero_bit(bus->devmap.devicemap, 15898af548dcSInaky Perez-Gonzalez 128, 1); 15901da177e4SLinus Torvalds bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); 15918af548dcSInaky Perez-Gonzalez } 15921da177e4SLinus Torvalds if (devnum < 128) { 15931da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 15941da177e4SLinus Torvalds udev->devnum = devnum; 15951da177e4SLinus Torvalds } 15961da177e4SLinus Torvalds } 15971da177e4SLinus Torvalds 15983b29b68bSAlan Stern static void release_devnum(struct usb_device *udev) 15991da177e4SLinus Torvalds { 16001da177e4SLinus Torvalds if (udev->devnum > 0) { 16011da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 16021da177e4SLinus Torvalds udev->devnum = -1; 16031da177e4SLinus Torvalds } 16041da177e4SLinus Torvalds } 16051da177e4SLinus Torvalds 16063b29b68bSAlan Stern static void update_devnum(struct usb_device *udev, int devnum) 16074953d141SDavid Vrabel { 16084953d141SDavid Vrabel /* The address for a WUSB device is managed by wusbcore. */ 16094953d141SDavid Vrabel if (!udev->wusb) 16104953d141SDavid Vrabel udev->devnum = devnum; 16114953d141SDavid Vrabel } 16124953d141SDavid Vrabel 1613f7410cedSHerbert Xu static void hub_free_dev(struct usb_device *udev) 1614f7410cedSHerbert Xu { 1615f7410cedSHerbert Xu struct usb_hcd *hcd = bus_to_hcd(udev->bus); 1616f7410cedSHerbert Xu 1617f7410cedSHerbert Xu /* Root hubs aren't real devices, so don't free HCD resources */ 1618f7410cedSHerbert Xu if (hcd->driver->free_dev && udev->parent) 1619f7410cedSHerbert Xu hcd->driver->free_dev(hcd, udev); 1620f7410cedSHerbert Xu } 1621f7410cedSHerbert Xu 16221da177e4SLinus Torvalds /** 16231da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 16241da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 16251da177e4SLinus Torvalds * Context: !in_interrupt () 16261da177e4SLinus Torvalds * 16271da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 16281da177e4SLinus Torvalds * 16291da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 16301da177e4SLinus Torvalds * If *pdev is a root hub then this routine will acquire the 16311da177e4SLinus Torvalds * usb_bus_list_lock on behalf of the caller. 16321da177e4SLinus Torvalds * 16331da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 16341da177e4SLinus Torvalds * controllers) should ever call this. 16351da177e4SLinus Torvalds * 16361da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 16371da177e4SLinus Torvalds */ 16381da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 16391da177e4SLinus Torvalds { 16401da177e4SLinus Torvalds struct usb_device *udev = *pdev; 16411da177e4SLinus Torvalds int i; 16421da177e4SLinus Torvalds 16431da177e4SLinus Torvalds if (!udev) { 1644441b62c1SHarvey Harrison pr_debug ("%s nodev\n", __func__); 16451da177e4SLinus Torvalds return; 16461da177e4SLinus Torvalds } 16471da177e4SLinus Torvalds 16481da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 16491da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 16501da177e4SLinus Torvalds * this quiesces everyting except pending urbs. 16511da177e4SLinus Torvalds */ 16521da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 16533b29b68bSAlan Stern dev_info(&udev->dev, "USB disconnect, device number %d\n", 16543b29b68bSAlan Stern udev->devnum); 16551da177e4SLinus Torvalds 16569ad3d6ccSAlan Stern usb_lock_device(udev); 16579ad3d6ccSAlan Stern 16581da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 16591da177e4SLinus Torvalds for (i = 0; i < USB_MAXCHILDREN; i++) { 16601da177e4SLinus Torvalds if (udev->children[i]) 16611da177e4SLinus Torvalds usb_disconnect(&udev->children[i]); 16621da177e4SLinus Torvalds } 16631da177e4SLinus Torvalds 16641da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 16651da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 16661da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 16671da177e4SLinus Torvalds */ 1668782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 16691da177e4SLinus Torvalds usb_disable_device(udev, 0); 1670cde217a5SAlan Stern usb_hcd_synchronize_unlinks(udev); 16711da177e4SLinus Torvalds 16723b23dd6fSAlan Stern usb_remove_ep_devs(&udev->ep0); 1673782da727SAlan Stern usb_unlock_device(udev); 16743099e75aSGreg Kroah-Hartman 1675782da727SAlan Stern /* Unregister the device. The device driver is responsible 16763b23dd6fSAlan Stern * for de-configuring the device and invoking the remove-device 16773b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 1678782da727SAlan Stern */ 1679782da727SAlan Stern device_del(&udev->dev); 1680782da727SAlan Stern 1681782da727SAlan Stern /* Free the device number and delete the parent's children[] 16821da177e4SLinus Torvalds * (or root_hub) pointer. 16831da177e4SLinus Torvalds */ 16843b29b68bSAlan Stern release_devnum(udev); 16851da177e4SLinus Torvalds 16861da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 16871da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 16881da177e4SLinus Torvalds *pdev = NULL; 16891da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 16901da177e4SLinus Torvalds 1691f7410cedSHerbert Xu hub_free_dev(udev); 1692f7410cedSHerbert Xu 1693782da727SAlan Stern put_device(&udev->dev); 16941da177e4SLinus Torvalds } 16951da177e4SLinus Torvalds 1696f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 16971da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 16981da177e4SLinus Torvalds { 16991da177e4SLinus Torvalds if (!string) 17001da177e4SLinus Torvalds return; 17011da177e4SLinus Torvalds dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); 17021da177e4SLinus Torvalds } 17031da177e4SLinus Torvalds 1704f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 1705f2a383e4SGreg Kroah-Hartman { 1706f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", 1707f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 1708f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idProduct)); 1709b9cef6c3SWu Fengguang dev_info(&udev->dev, 1710b9cef6c3SWu Fengguang "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", 1711f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 1712f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 1713f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 1714f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 1715f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 1716f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 1717f2a383e4SGreg Kroah-Hartman } 17181da177e4SLinus Torvalds #else 1719f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 17201da177e4SLinus Torvalds #endif 17211da177e4SLinus Torvalds 17221da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 17231da177e4SLinus Torvalds #include "otg_whitelist.h" 17241da177e4SLinus Torvalds #endif 17251da177e4SLinus Torvalds 17263ede760fSOliver Neukum /** 17278d8558d1SAlan Stern * usb_enumerate_device_otg - FIXME (usbcore-internal) 17283ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 17293ede760fSOliver Neukum * 17308d8558d1SAlan Stern * Finish enumeration for On-The-Go devices 17313ede760fSOliver Neukum */ 17328d8558d1SAlan Stern static int usb_enumerate_device_otg(struct usb_device *udev) 17331da177e4SLinus Torvalds { 1734d9d16e8aSInaky Perez-Gonzalez int err = 0; 17351da177e4SLinus Torvalds 17361da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 17371da177e4SLinus Torvalds /* 17381da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 17391da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 17401da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 17411da177e4SLinus Torvalds */ 17421da177e4SLinus Torvalds if (!udev->bus->is_b_host 17431da177e4SLinus Torvalds && udev->config 17441da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 17452eb5052eSFelipe Balbi struct usb_otg_descriptor *desc = NULL; 17461da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 17471da177e4SLinus Torvalds 17481da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 17491da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 17501da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 17511da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 17521da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 175312c3da34SAlan Stern unsigned port1 = udev->portnum; 17541da177e4SLinus Torvalds 17551da177e4SLinus Torvalds dev_info(&udev->dev, 17561da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 17571da177e4SLinus Torvalds (port1 == bus->otg_port) 17581da177e4SLinus Torvalds ? "" : "non-"); 17591da177e4SLinus Torvalds 17601da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 17611da177e4SLinus Torvalds if (port1 == bus->otg_port) 17621da177e4SLinus Torvalds bus->b_hnp_enable = 1; 17631da177e4SLinus Torvalds err = usb_control_msg(udev, 17641da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 17651da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 17661da177e4SLinus Torvalds bus->b_hnp_enable 17671da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 17681da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 17691da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 17701da177e4SLinus Torvalds if (err < 0) { 17711da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 17721da177e4SLinus Torvalds * customize to match your product. 17731da177e4SLinus Torvalds */ 17741da177e4SLinus Torvalds dev_info(&udev->dev, 1775b9cef6c3SWu Fengguang "can't set HNP mode: %d\n", 17761da177e4SLinus Torvalds err); 17771da177e4SLinus Torvalds bus->b_hnp_enable = 0; 17781da177e4SLinus Torvalds } 17791da177e4SLinus Torvalds } 17801da177e4SLinus Torvalds } 17811da177e4SLinus Torvalds } 17821da177e4SLinus Torvalds 17831da177e4SLinus Torvalds if (!is_targeted(udev)) { 17841da177e4SLinus Torvalds 17851da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 17861da177e4SLinus Torvalds * (Includes HNP test device.) 17871da177e4SLinus Torvalds */ 17881da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 1789634a84f8SDavid Brownell err = usb_port_suspend(udev, PMSG_SUSPEND); 17901da177e4SLinus Torvalds if (err < 0) 17911da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 17921da177e4SLinus Torvalds } 1793ffcdc18dSVikram Pandita err = -ENOTSUPP; 17941da177e4SLinus Torvalds goto fail; 17951da177e4SLinus Torvalds } 1796d9d16e8aSInaky Perez-Gonzalez fail: 17971da177e4SLinus Torvalds #endif 1798d9d16e8aSInaky Perez-Gonzalez return err; 1799d9d16e8aSInaky Perez-Gonzalez } 18001da177e4SLinus Torvalds 1801d9d16e8aSInaky Perez-Gonzalez 1802d9d16e8aSInaky Perez-Gonzalez /** 18038d8558d1SAlan Stern * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) 1804d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 1805d9d16e8aSInaky Perez-Gonzalez * 1806d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 1807d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 1808d9d16e8aSInaky Perez-Gonzalez * environment. 1809d9d16e8aSInaky Perez-Gonzalez * 1810d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 1811d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 1812d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 1813d9d16e8aSInaky Perez-Gonzalez */ 18148d8558d1SAlan Stern static int usb_enumerate_device(struct usb_device *udev) 1815d9d16e8aSInaky Perez-Gonzalez { 1816d9d16e8aSInaky Perez-Gonzalez int err; 1817d9d16e8aSInaky Perez-Gonzalez 1818d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 1819d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 1820d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 1821d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 1822d9d16e8aSInaky Perez-Gonzalez err); 1823d9d16e8aSInaky Perez-Gonzalez goto fail; 1824d9d16e8aSInaky Perez-Gonzalez } 1825d9d16e8aSInaky Perez-Gonzalez } 1826d9d16e8aSInaky Perez-Gonzalez if (udev->wusb == 1 && udev->authorized == 0) { 1827d9d16e8aSInaky Perez-Gonzalez udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1828d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1829d9d16e8aSInaky Perez-Gonzalez udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1830d9d16e8aSInaky Perez-Gonzalez } 1831d9d16e8aSInaky Perez-Gonzalez else { 1832d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 1833d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 1834d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 1835d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 1836d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 1837d9d16e8aSInaky Perez-Gonzalez } 18388d8558d1SAlan Stern err = usb_enumerate_device_otg(udev); 1839d9d16e8aSInaky Perez-Gonzalez fail: 1840d9d16e8aSInaky Perez-Gonzalez return err; 1841d9d16e8aSInaky Perez-Gonzalez } 1842d9d16e8aSInaky Perez-Gonzalez 1843d9d16e8aSInaky Perez-Gonzalez 1844d9d16e8aSInaky Perez-Gonzalez /** 1845d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 1846d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 1847d9d16e8aSInaky Perez-Gonzalez * 18488d8558d1SAlan Stern * This is called with devices which have been detected but not fully 18498d8558d1SAlan Stern * enumerated. The device descriptor is available, but not descriptors 1850d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 1851d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 1852d9d16e8aSInaky Perez-Gonzalez * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 1853d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 1854d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 1855d9d16e8aSInaky Perez-Gonzalez * 1856d9d16e8aSInaky Perez-Gonzalez * It will return if the device is configured properly or not. Zero if 1857d9d16e8aSInaky Perez-Gonzalez * the interface was registered with the driver core; else a negative 1858d9d16e8aSInaky Perez-Gonzalez * errno value. 1859d9d16e8aSInaky Perez-Gonzalez * 1860d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 1861d9d16e8aSInaky Perez-Gonzalez * 1862d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 1863d9d16e8aSInaky Perez-Gonzalez */ 1864d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 1865d9d16e8aSInaky Perez-Gonzalez { 1866d9d16e8aSInaky Perez-Gonzalez int err; 1867d9d16e8aSInaky Perez-Gonzalez 186816985408SDan Streetman if (udev->parent) { 186916985408SDan Streetman /* Initialize non-root-hub device wakeup to disabled; 187016985408SDan Streetman * device (un)configuration controls wakeup capable 187116985408SDan Streetman * sysfs power/wakeup controls wakeup enabled/disabled 187216985408SDan Streetman */ 187316985408SDan Streetman device_init_wakeup(&udev->dev, 0); 187416985408SDan Streetman } 187516985408SDan Streetman 18769bbdf1e0SAlan Stern /* Tell the runtime-PM framework the device is active */ 18779bbdf1e0SAlan Stern pm_runtime_set_active(&udev->dev); 1878c08512c7SAlan Stern pm_runtime_get_noresume(&udev->dev); 1879fcc4a01eSAlan Stern pm_runtime_use_autosuspend(&udev->dev); 18809bbdf1e0SAlan Stern pm_runtime_enable(&udev->dev); 18819bbdf1e0SAlan Stern 1882c08512c7SAlan Stern /* By default, forbid autosuspend for all devices. It will be 1883c08512c7SAlan Stern * allowed for hubs during binding. 1884c08512c7SAlan Stern */ 1885c08512c7SAlan Stern usb_disable_autosuspend(udev); 1886c08512c7SAlan Stern 18878d8558d1SAlan Stern err = usb_enumerate_device(udev); /* Read descriptors */ 1888d9d16e8aSInaky Perez-Gonzalez if (err < 0) 1889d9d16e8aSInaky Perez-Gonzalez goto fail; 1890c6515272SSarah Sharp dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", 1891c6515272SSarah Sharp udev->devnum, udev->bus->busnum, 1892c6515272SSarah Sharp (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 18939f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 18949f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 18959f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 18969f8b17e6SKay Sievers 18976cd13201SAlan Stern /* Tell the world! */ 18986cd13201SAlan Stern announce_device(udev); 1899195af2ccSAlan Stern 1900927bc916SRafael J. Wysocki device_enable_async_suspend(&udev->dev); 1901782da727SAlan Stern /* Register the device. The device driver is responsible 19023b23dd6fSAlan Stern * for configuring the device and invoking the add-device 19033b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 1904782da727SAlan Stern */ 19051da177e4SLinus Torvalds err = device_add(&udev->dev); 19061da177e4SLinus Torvalds if (err) { 19071da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 19081da177e4SLinus Torvalds goto fail; 19091da177e4SLinus Torvalds } 19109ad3d6ccSAlan Stern 19113b23dd6fSAlan Stern (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); 1912c08512c7SAlan Stern usb_mark_last_busy(udev); 1913c08512c7SAlan Stern pm_runtime_put_sync_autosuspend(&udev->dev); 1914c066475eSGreg Kroah-Hartman return err; 19151da177e4SLinus Torvalds 19161da177e4SLinus Torvalds fail: 19171da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 19189bbdf1e0SAlan Stern pm_runtime_disable(&udev->dev); 19199bbdf1e0SAlan Stern pm_runtime_set_suspended(&udev->dev); 1920d9d16e8aSInaky Perez-Gonzalez return err; 19211da177e4SLinus Torvalds } 19221da177e4SLinus Torvalds 192393993a0aSInaky Perez-Gonzalez 192493993a0aSInaky Perez-Gonzalez /** 1925fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 1926fd39c86bSRandy Dunlap * @usb_dev: USB device 1927fd39c86bSRandy Dunlap * 1928fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 1929fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 193093993a0aSInaky Perez-Gonzalez * 193193993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 193293993a0aSInaky Perez-Gonzalez * defer its call. 193393993a0aSInaky Perez-Gonzalez */ 193493993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 193593993a0aSInaky Perez-Gonzalez { 193693993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 193793993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 193893993a0aSInaky Perez-Gonzalez goto out_unauthorized; 1939da307123SAlan Stern 194093993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 194193993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 1942da307123SAlan Stern 1943da307123SAlan Stern kfree(usb_dev->product); 194493993a0aSInaky Perez-Gonzalez usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1945da307123SAlan Stern kfree(usb_dev->manufacturer); 194693993a0aSInaky Perez-Gonzalez usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1947da307123SAlan Stern kfree(usb_dev->serial); 194893993a0aSInaky Perez-Gonzalez usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); 1949da307123SAlan Stern 1950da307123SAlan Stern usb_destroy_configuration(usb_dev); 195193993a0aSInaky Perez-Gonzalez usb_dev->descriptor.bNumConfigurations = 0; 1952da307123SAlan Stern 195393993a0aSInaky Perez-Gonzalez out_unauthorized: 195493993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 195593993a0aSInaky Perez-Gonzalez return 0; 195693993a0aSInaky Perez-Gonzalez } 195793993a0aSInaky Perez-Gonzalez 195893993a0aSInaky Perez-Gonzalez 195993993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 196093993a0aSInaky Perez-Gonzalez { 196193993a0aSInaky Perez-Gonzalez int result = 0, c; 1962da307123SAlan Stern 196393993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 196493993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 196593993a0aSInaky Perez-Gonzalez goto out_authorized; 1966da307123SAlan Stern 196793993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 196893993a0aSInaky Perez-Gonzalez if (result < 0) { 196993993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 197093993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 197193993a0aSInaky Perez-Gonzalez goto error_autoresume; 197293993a0aSInaky Perez-Gonzalez } 197393993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 197493993a0aSInaky Perez-Gonzalez if (result < 0) { 197593993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 197693993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 197793993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 197893993a0aSInaky Perez-Gonzalez } 1979da307123SAlan Stern 1980da307123SAlan Stern kfree(usb_dev->product); 1981da307123SAlan Stern usb_dev->product = NULL; 1982da307123SAlan Stern kfree(usb_dev->manufacturer); 1983da307123SAlan Stern usb_dev->manufacturer = NULL; 1984da307123SAlan Stern kfree(usb_dev->serial); 1985da307123SAlan Stern usb_dev->serial = NULL; 1986da307123SAlan Stern 198793993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 19888d8558d1SAlan Stern result = usb_enumerate_device(usb_dev); 198993993a0aSInaky Perez-Gonzalez if (result < 0) 19908d8558d1SAlan Stern goto error_enumerate; 199193993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 199293993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 199393993a0aSInaky Perez-Gonzalez */ 1994b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 199593993a0aSInaky Perez-Gonzalez if (c >= 0) { 199693993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 199793993a0aSInaky Perez-Gonzalez if (result) { 199893993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 199993993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 200093993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 200193993a0aSInaky Perez-Gonzalez * set other configurations. */ 200293993a0aSInaky Perez-Gonzalez } 200393993a0aSInaky Perez-Gonzalez } 200493993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 2005da307123SAlan Stern 20068d8558d1SAlan Stern error_enumerate: 200793993a0aSInaky Perez-Gonzalez error_device_descriptor: 2008da307123SAlan Stern usb_autosuspend_device(usb_dev); 200993993a0aSInaky Perez-Gonzalez error_autoresume: 201093993a0aSInaky Perez-Gonzalez out_authorized: 201193993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); // complements locktree 201293993a0aSInaky Perez-Gonzalez return result; 201393993a0aSInaky Perez-Gonzalez } 201493993a0aSInaky Perez-Gonzalez 201593993a0aSInaky Perez-Gonzalez 20160165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 20170165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 20180165de09SInaky Perez-Gonzalez { 20190165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 20200165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 20210165de09SInaky Perez-Gonzalez return 0; 20220165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 20230165de09SInaky Perez-Gonzalez return hcd->wireless; 20240165de09SInaky Perez-Gonzalez } 20250165de09SInaky Perez-Gonzalez 20260165de09SInaky Perez-Gonzalez 20271da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 20281da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 20291da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 20301da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 20311da177e4SLinus Torvalds #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) 20321da177e4SLinus Torvalds 20331da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 20341da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 20351da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 20361da177e4SLinus Torvalds #define HUB_RESET_TIMEOUT 500 20371da177e4SLinus Torvalds 20381da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 20391da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 20401da177e4SLinus Torvalds { 20411da177e4SLinus Torvalds int delay_time, ret; 20421da177e4SLinus Torvalds u16 portstatus; 20431da177e4SLinus Torvalds u16 portchange; 20441da177e4SLinus Torvalds 20451da177e4SLinus Torvalds for (delay_time = 0; 20461da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 20471da177e4SLinus Torvalds delay_time += delay) { 20481da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 20491da177e4SLinus Torvalds msleep(delay); 20501da177e4SLinus Torvalds 20511da177e4SLinus Torvalds /* read and decode port status */ 20521da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 20531da177e4SLinus Torvalds if (ret < 0) 20541da177e4SLinus Torvalds return ret; 20551da177e4SLinus Torvalds 20561da177e4SLinus Torvalds /* Device went away? */ 20571da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 20581da177e4SLinus Torvalds return -ENOTCONN; 20591da177e4SLinus Torvalds 2060dd4dd19eSAlan Stern /* bomb out completely if the connection bounced */ 20611da177e4SLinus Torvalds if ((portchange & USB_PORT_STAT_C_CONNECTION)) 2062dd4dd19eSAlan Stern return -ENOTCONN; 20631da177e4SLinus Torvalds 20641da177e4SLinus Torvalds /* if we`ve finished resetting, then break out of the loop */ 20651da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_RESET) && 20661da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_ENABLE)) { 20670165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 2068551cdbbeSGreg Kroah-Hartman udev->speed = USB_SPEED_WIRELESS; 2069131dec34SSarah Sharp else if (hub_is_superspeed(hub->hdev)) 2070809cd1cbSSarah Sharp udev->speed = USB_SPEED_SUPER; 20710165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 20721da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 20731da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 20741da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 20751da177e4SLinus Torvalds else 20761da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 20771da177e4SLinus Torvalds return 0; 20781da177e4SLinus Torvalds } 20791da177e4SLinus Torvalds 20801da177e4SLinus Torvalds /* switch to the long delay after two short delay failures */ 20811da177e4SLinus Torvalds if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 20821da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 20831da177e4SLinus Torvalds 20841da177e4SLinus Torvalds dev_dbg (hub->intfdev, 20851da177e4SLinus Torvalds "port %d not reset yet, waiting %dms\n", 20861da177e4SLinus Torvalds port1, delay); 20871da177e4SLinus Torvalds } 20881da177e4SLinus Torvalds 20891da177e4SLinus Torvalds return -EBUSY; 20901da177e4SLinus Torvalds } 20911da177e4SLinus Torvalds 20921da177e4SLinus Torvalds static int hub_port_reset(struct usb_hub *hub, int port1, 20931da177e4SLinus Torvalds struct usb_device *udev, unsigned int delay) 20941da177e4SLinus Torvalds { 20951da177e4SLinus Torvalds int i, status; 2096a5f0efabSSarah Sharp struct usb_hcd *hcd; 20971da177e4SLinus Torvalds 2098a5f0efabSSarah Sharp hcd = bus_to_hcd(udev->bus); 209932fe0198SAlan Stern /* Block EHCI CF initialization during the port reset. 210032fe0198SAlan Stern * Some companion controllers don't like it when they mix. 210132fe0198SAlan Stern */ 210232fe0198SAlan Stern down_read(&ehci_cf_port_reset_rwsem); 210332fe0198SAlan Stern 21041da177e4SLinus Torvalds /* Reset the port */ 21051da177e4SLinus Torvalds for (i = 0; i < PORT_RESET_TRIES; i++) { 21061da177e4SLinus Torvalds status = set_port_feature(hub->hdev, 21071da177e4SLinus Torvalds port1, USB_PORT_FEAT_RESET); 21081da177e4SLinus Torvalds if (status) 21091da177e4SLinus Torvalds dev_err(hub->intfdev, 21101da177e4SLinus Torvalds "cannot reset port %d (err = %d)\n", 21111da177e4SLinus Torvalds port1, status); 21121da177e4SLinus Torvalds else { 21131da177e4SLinus Torvalds status = hub_port_wait_reset(hub, port1, udev, delay); 2114dd16525bSDavid Brownell if (status && status != -ENOTCONN) 21151da177e4SLinus Torvalds dev_dbg(hub->intfdev, 21161da177e4SLinus Torvalds "port_wait_reset: err = %d\n", 21171da177e4SLinus Torvalds status); 21181da177e4SLinus Torvalds } 21191da177e4SLinus Torvalds 21201da177e4SLinus Torvalds /* return on disconnect or reset */ 21211da177e4SLinus Torvalds switch (status) { 21221da177e4SLinus Torvalds case 0: 2123b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 2124b789696aSDavid Brownell msleep(10 + 40); 21253b29b68bSAlan Stern update_devnum(udev, 0); 2126a5f0efabSSarah Sharp if (hcd->driver->reset_device) { 2127a5f0efabSSarah Sharp status = hcd->driver->reset_device(hcd, udev); 2128a5f0efabSSarah Sharp if (status < 0) { 2129a5f0efabSSarah Sharp dev_err(&udev->dev, "Cannot reset " 2130a5f0efabSSarah Sharp "HCD device state\n"); 2131a5f0efabSSarah Sharp break; 2132a5f0efabSSarah Sharp } 2133a5f0efabSSarah Sharp } 21341da177e4SLinus Torvalds /* FALL THROUGH */ 21351da177e4SLinus Torvalds case -ENOTCONN: 21361da177e4SLinus Torvalds case -ENODEV: 21371da177e4SLinus Torvalds clear_port_feature(hub->hdev, 21381da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 21391da177e4SLinus Torvalds /* FIXME need disconnect() for NOTATTACHED device */ 21401da177e4SLinus Torvalds usb_set_device_state(udev, status 21411da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 21421da177e4SLinus Torvalds : USB_STATE_DEFAULT); 214332fe0198SAlan Stern goto done; 21441da177e4SLinus Torvalds } 21451da177e4SLinus Torvalds 21461da177e4SLinus Torvalds dev_dbg (hub->intfdev, 21471da177e4SLinus Torvalds "port %d not enabled, trying reset again...\n", 21481da177e4SLinus Torvalds port1); 21491da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 21501da177e4SLinus Torvalds } 21511da177e4SLinus Torvalds 21521da177e4SLinus Torvalds dev_err (hub->intfdev, 21531da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 21541da177e4SLinus Torvalds port1); 21551da177e4SLinus Torvalds 215632fe0198SAlan Stern done: 215732fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 21581da177e4SLinus Torvalds return status; 21591da177e4SLinus Torvalds } 21601da177e4SLinus Torvalds 2161d388dab7SAlan Stern #ifdef CONFIG_PM 21621da177e4SLinus Torvalds 2163b01b03f3SAlan Stern #define MASK_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | \ 2164b01b03f3SAlan Stern USB_PORT_STAT_SUSPEND) 2165b01b03f3SAlan Stern #define WANT_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION) 2166b01b03f3SAlan Stern 2167b01b03f3SAlan Stern /* Determine whether the device on a port is ready for a normal resume, 2168b01b03f3SAlan Stern * is ready for a reset-resume, or should be disconnected. 2169b01b03f3SAlan Stern */ 2170b01b03f3SAlan Stern static int check_port_resume_type(struct usb_device *udev, 2171b01b03f3SAlan Stern struct usb_hub *hub, int port1, 2172b01b03f3SAlan Stern int status, unsigned portchange, unsigned portstatus) 2173b01b03f3SAlan Stern { 2174b01b03f3SAlan Stern /* Is the device still present? */ 2175b01b03f3SAlan Stern if (status || (portstatus & MASK_BITS) != WANT_BITS) { 2176b01b03f3SAlan Stern if (status >= 0) 2177b01b03f3SAlan Stern status = -ENODEV; 2178b01b03f3SAlan Stern } 2179b01b03f3SAlan Stern 218086c57edfSAlan Stern /* Can't do a normal resume if the port isn't enabled, 218186c57edfSAlan Stern * so try a reset-resume instead. 218286c57edfSAlan Stern */ 218386c57edfSAlan Stern else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { 218486c57edfSAlan Stern if (udev->persist_enabled) 218586c57edfSAlan Stern udev->reset_resume = 1; 218686c57edfSAlan Stern else 2187b01b03f3SAlan Stern status = -ENODEV; 218886c57edfSAlan Stern } 2189b01b03f3SAlan Stern 2190b01b03f3SAlan Stern if (status) { 2191b01b03f3SAlan Stern dev_dbg(hub->intfdev, 2192b01b03f3SAlan Stern "port %d status %04x.%04x after resume, %d\n", 2193b01b03f3SAlan Stern port1, portchange, portstatus, status); 2194b01b03f3SAlan Stern } else if (udev->reset_resume) { 2195b01b03f3SAlan Stern 2196b01b03f3SAlan Stern /* Late port handoff can set status-change bits */ 2197b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) 2198b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2199b01b03f3SAlan Stern USB_PORT_FEAT_C_CONNECTION); 2200b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) 2201b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2202b01b03f3SAlan Stern USB_PORT_FEAT_C_ENABLE); 2203b01b03f3SAlan Stern } 2204b01b03f3SAlan Stern 2205b01b03f3SAlan Stern return status; 2206b01b03f3SAlan Stern } 2207b01b03f3SAlan Stern 22081da177e4SLinus Torvalds #ifdef CONFIG_USB_SUSPEND 22091da177e4SLinus Torvalds 22101da177e4SLinus Torvalds /* 2211140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 2212624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 22135edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 22141da177e4SLinus Torvalds * 22151da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 22161da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 22171da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 2218140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 22191da177e4SLinus Torvalds * to disconnect devices while they are suspended. 22201da177e4SLinus Torvalds * 2221390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 2222390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 2223390a8c34SDavid Brownell * 2224624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 2225624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 2226624d6c07SAlan Stern * All devices below the suspended port are also suspended. 2227624d6c07SAlan Stern * 2228624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 2229624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 2230624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 2231624d6c07SAlan Stern * some cases, this wakes the USB host. 2232624d6c07SAlan Stern * 22331da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 22341da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 22351da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 22361da177e4SLinus Torvalds * 22374956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 22384956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 22394956eccdSAlan Stern * State transitions include: 22404956eccdSAlan Stern * 22414956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 22424956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 22434956eccdSAlan Stern * 22444956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 22454956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 22464956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 22474956eccdSAlan Stern * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 22484956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 22494956eccdSAlan Stern * 22504956eccdSAlan Stern * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when 22514956eccdSAlan Stern * the root hub for their bus goes into global suspend ... so we don't 22524956eccdSAlan Stern * (falsely) update the device power state to say it suspended. 22534956eccdSAlan Stern * 22541da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 22551da177e4SLinus Torvalds */ 225665bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 22571da177e4SLinus Torvalds { 2258624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2259624d6c07SAlan Stern int port1 = udev->portnum; 2260624d6c07SAlan Stern int status; 22614956eccdSAlan Stern 2262624d6c07SAlan Stern // dev_dbg(hub->intfdev, "suspend port %d\n", port1); 2263624d6c07SAlan Stern 2264624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 2265624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 2266624d6c07SAlan Stern * 2267624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 2268624d6c07SAlan Stern * we don't explicitly enable it here. 2269624d6c07SAlan Stern */ 2270624d6c07SAlan Stern if (udev->do_remote_wakeup) { 2271624d6c07SAlan Stern status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2272624d6c07SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 2273624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 2274624d6c07SAlan Stern NULL, 0, 2275624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 22760c487206SOliver Neukum if (status) { 2277624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 2278624d6c07SAlan Stern status); 22790c487206SOliver Neukum /* bail if autosuspend is requested */ 22800c487206SOliver Neukum if (msg.event & PM_EVENT_AUTO) 22810c487206SOliver Neukum return status; 22820c487206SOliver Neukum } 2283624d6c07SAlan Stern } 2284624d6c07SAlan Stern 2285624d6c07SAlan Stern /* see 7.1.7.6 */ 2286624d6c07SAlan Stern status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); 2287624d6c07SAlan Stern if (status) { 2288624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", 2289624d6c07SAlan Stern port1, status); 2290624d6c07SAlan Stern /* paranoia: "should not happen" */ 22910c487206SOliver Neukum if (udev->do_remote_wakeup) 2292624d6c07SAlan Stern (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2293624d6c07SAlan Stern USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 2294624d6c07SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, 2295624d6c07SAlan Stern NULL, 0, 2296624d6c07SAlan Stern USB_CTRL_SET_TIMEOUT); 2297624d6c07SAlan Stern } else { 2298624d6c07SAlan Stern /* device has up to 10 msec to fully suspend */ 2299624d6c07SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend\n", 230065bfd296SAlan Stern (msg.event & PM_EVENT_AUTO ? "auto-" : "")); 2301624d6c07SAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 2302624d6c07SAlan Stern msleep(10); 2303624d6c07SAlan Stern } 2304c08512c7SAlan Stern usb_mark_last_busy(hub->hdev); 23054956eccdSAlan Stern return status; 23061da177e4SLinus Torvalds } 2307f3f3253dSDavid Brownell 23081da177e4SLinus Torvalds /* 2309390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 2310390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 231154515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 23121da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 23131da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 23141da177e4SLinus Torvalds * in the tree that's rooted at this device. 231554515fe5SAlan Stern * 231654515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 231754515fe5SAlan Stern * status check is done. 23181da177e4SLinus Torvalds */ 2319140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 23201da177e4SLinus Torvalds { 232154515fe5SAlan Stern int status = 0; 23221da177e4SLinus Torvalds u16 devstatus; 23231da177e4SLinus Torvalds 23241da177e4SLinus Torvalds /* caller owns the udev device lock */ 2325b9cef6c3SWu Fengguang dev_dbg(&udev->dev, "%s\n", 2326b9cef6c3SWu Fengguang udev->reset_resume ? "finish reset-resume" : "finish resume"); 23271da177e4SLinus Torvalds 23281da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 23291da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 23301da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 23311da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 23321da177e4SLinus Torvalds */ 23331da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 23341da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 23351da177e4SLinus Torvalds : USB_STATE_ADDRESS); 23361da177e4SLinus Torvalds 233754515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 233854515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 233954515fe5SAlan Stern * operation is carried out here, after the port has been 234054515fe5SAlan Stern * resumed. 234154515fe5SAlan Stern */ 234254515fe5SAlan Stern if (udev->reset_resume) 234386c57edfSAlan Stern retry_reset_resume: 2344742120c6SMing Lei status = usb_reset_and_verify_device(udev); 234554515fe5SAlan Stern 23461da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 23471da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 23481da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 23491da177e4SLinus Torvalds */ 235054515fe5SAlan Stern if (status == 0) { 235146dede46SAlan Stern devstatus = 0; 23521da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 2353b40b7a90SAlan Stern if (status >= 0) 235446dede46SAlan Stern status = (status > 0 ? 0 : -ENODEV); 235586c57edfSAlan Stern 235686c57edfSAlan Stern /* If a normal resume failed, try doing a reset-resume */ 235786c57edfSAlan Stern if (status && !udev->reset_resume && udev->persist_enabled) { 235886c57edfSAlan Stern dev_dbg(&udev->dev, "retry with reset-resume\n"); 235986c57edfSAlan Stern udev->reset_resume = 1; 236086c57edfSAlan Stern goto retry_reset_resume; 236186c57edfSAlan Stern } 236254515fe5SAlan Stern } 2363b40b7a90SAlan Stern 2364624d6c07SAlan Stern if (status) { 2365624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 23661da177e4SLinus Torvalds status); 2367624d6c07SAlan Stern } else if (udev->actconfig) { 23681da177e4SLinus Torvalds le16_to_cpus(&devstatus); 2369686314cfSAlan Stern if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { 23701da177e4SLinus Torvalds status = usb_control_msg(udev, 23711da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 23721da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, 23731da177e4SLinus Torvalds USB_RECIP_DEVICE, 23741da177e4SLinus Torvalds USB_DEVICE_REMOTE_WAKEUP, 0, 23751da177e4SLinus Torvalds NULL, 0, 23761da177e4SLinus Torvalds USB_CTRL_SET_TIMEOUT); 2377a8e7c565SAlan Stern if (status) 2378b9cef6c3SWu Fengguang dev_dbg(&udev->dev, 2379b9cef6c3SWu Fengguang "disable remote wakeup, status %d\n", 2380b9cef6c3SWu Fengguang status); 23814bf0ba86SAlan Stern } 23821da177e4SLinus Torvalds status = 0; 23831da177e4SLinus Torvalds } 23841da177e4SLinus Torvalds return status; 23851da177e4SLinus Torvalds } 23861da177e4SLinus Torvalds 2387624d6c07SAlan Stern /* 2388624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 2389624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 2390624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 2391624d6c07SAlan Stern * 2392624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 2393624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 2394624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 2395624d6c07SAlan Stern * the host and the device is the same as it was when the device 2396624d6c07SAlan Stern * suspended. 2397624d6c07SAlan Stern * 2398feccc30dSAlan Stern * If @udev->reset_resume is set then this routine won't check that the 2399feccc30dSAlan Stern * port is still enabled. Furthermore, finish_port_resume() above will 240054515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 240154515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 240254515fe5SAlan Stern * 240354515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 240454515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 240554515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 240654515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 240754515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 240854515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 240954515fe5SAlan Stern * made to appear as if it had not disconnected. 241054515fe5SAlan Stern * 2411742120c6SMing Lei * This facility can be dangerous. Although usb_reset_and_verify_device() makes 2412feccc30dSAlan Stern * every effort to insure that the same device is present after the 241354515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 241454515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 241554515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 241654515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 241754515fe5SAlan Stern * new card is corrupted and the system crashes. 241854515fe5SAlan Stern * 2419624d6c07SAlan Stern * Returns 0 on success, else negative errno. 2420624d6c07SAlan Stern */ 242165bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 24221da177e4SLinus Torvalds { 2423624d6c07SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2424624d6c07SAlan Stern int port1 = udev->portnum; 24251da177e4SLinus Torvalds int status; 2426d25450c6SAlan Stern u16 portchange, portstatus; 2427d25450c6SAlan Stern 2428d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 2429d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 2430d25450c6SAlan Stern if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND)) 2431d25450c6SAlan Stern goto SuspendCleared; 24321da177e4SLinus Torvalds 24331da177e4SLinus Torvalds // dev_dbg(hub->intfdev, "resume port %d\n", port1); 24341da177e4SLinus Torvalds 2435d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 2436d5cbad4bSAlan Stern 24371da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 24381da177e4SLinus Torvalds status = clear_port_feature(hub->hdev, 24391da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 24401da177e4SLinus Torvalds if (status) { 2441624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", 24421da177e4SLinus Torvalds port1, status); 24431da177e4SLinus Torvalds } else { 24441da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 2445645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 244665bfd296SAlan Stern (msg.event & PM_EVENT_AUTO ? "auto-" : "")); 24471da177e4SLinus Torvalds msleep(25); 24481da177e4SLinus Torvalds 24491da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 24501da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 24511da177e4SLinus Torvalds * sequence. 24521da177e4SLinus Torvalds */ 2453d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 245454515fe5SAlan Stern 24551da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 24561da177e4SLinus Torvalds msleep(10); 24571da177e4SLinus Torvalds } 2458b01b03f3SAlan Stern 2459b01b03f3SAlan Stern SuspendCleared: 2460b01b03f3SAlan Stern if (status == 0) { 2461b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 2462b01b03f3SAlan Stern clear_port_feature(hub->hdev, port1, 2463b01b03f3SAlan Stern USB_PORT_FEAT_C_SUSPEND); 24641da177e4SLinus Torvalds } 24651da177e4SLinus Torvalds 2466d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 2467d5cbad4bSAlan Stern 2468b01b03f3SAlan Stern status = check_port_resume_type(udev, 2469b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 247054515fe5SAlan Stern if (status == 0) 247154515fe5SAlan Stern status = finish_port_resume(udev); 247254515fe5SAlan Stern if (status < 0) { 247354515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 247454515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 247554515fe5SAlan Stern } 24761da177e4SLinus Torvalds return status; 24771da177e4SLinus Torvalds } 24781da177e4SLinus Torvalds 24798808f00cSAlan Stern /* caller has locked udev */ 24800534d468SAlan Stern int usb_remote_wakeup(struct usb_device *udev) 24811da177e4SLinus Torvalds { 24821da177e4SLinus Torvalds int status = 0; 24831da177e4SLinus Torvalds 24841da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 2485645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 24869bbdf1e0SAlan Stern status = usb_autoresume_device(udev); 24879bbdf1e0SAlan Stern if (status == 0) { 24889bbdf1e0SAlan Stern /* Let the drivers do their thing, then... */ 24899bbdf1e0SAlan Stern usb_autosuspend_device(udev); 24909bbdf1e0SAlan Stern } 2491d25450c6SAlan Stern } 24921da177e4SLinus Torvalds return status; 24931da177e4SLinus Torvalds } 24941da177e4SLinus Torvalds 2495d388dab7SAlan Stern #else /* CONFIG_USB_SUSPEND */ 2496d388dab7SAlan Stern 2497d388dab7SAlan Stern /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ 2498d388dab7SAlan Stern 249965bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 2500d388dab7SAlan Stern { 2501d388dab7SAlan Stern return 0; 2502d388dab7SAlan Stern } 2503d388dab7SAlan Stern 2504b01b03f3SAlan Stern /* However we may need to do a reset-resume */ 2505b01b03f3SAlan Stern 250665bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 2507d388dab7SAlan Stern { 2508b01b03f3SAlan Stern struct usb_hub *hub = hdev_to_hub(udev->parent); 2509b01b03f3SAlan Stern int port1 = udev->portnum; 2510b01b03f3SAlan Stern int status; 2511b01b03f3SAlan Stern u16 portchange, portstatus; 251254515fe5SAlan Stern 2513b01b03f3SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 2514b01b03f3SAlan Stern status = check_port_resume_type(udev, 2515b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 2516b01b03f3SAlan Stern 2517b01b03f3SAlan Stern if (status) { 2518b01b03f3SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 2519b01b03f3SAlan Stern hub_port_logical_disconnect(hub, port1); 2520b01b03f3SAlan Stern } else if (udev->reset_resume) { 252154515fe5SAlan Stern dev_dbg(&udev->dev, "reset-resume\n"); 2522742120c6SMing Lei status = usb_reset_and_verify_device(udev); 252354515fe5SAlan Stern } 252454515fe5SAlan Stern return status; 2525d388dab7SAlan Stern } 2526d388dab7SAlan Stern 2527d388dab7SAlan Stern #endif 2528d388dab7SAlan Stern 2529db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 25301da177e4SLinus Torvalds { 25311da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 25321da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 25331da177e4SLinus Torvalds unsigned port1; 25341da177e4SLinus Torvalds 2535c9f89fa4SDavid Brownell /* fail if children aren't already suspended */ 25361da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 25371da177e4SLinus Torvalds struct usb_device *udev; 25381da177e4SLinus Torvalds 25391da177e4SLinus Torvalds udev = hdev->children [port1-1]; 25406840d255SAlan Stern if (udev && udev->can_submit) { 254165bfd296SAlan Stern if (!(msg.event & PM_EVENT_AUTO)) 2542645daaabSAlan Stern dev_dbg(&intf->dev, "port %d nyet suspended\n", 2543645daaabSAlan Stern port1); 2544c9f89fa4SDavid Brownell return -EBUSY; 2545c9f89fa4SDavid Brownell } 25461da177e4SLinus Torvalds } 25471da177e4SLinus Torvalds 2548441b62c1SHarvey Harrison dev_dbg(&intf->dev, "%s\n", __func__); 254940f122f3SAlan Stern 2550c9f89fa4SDavid Brownell /* stop khubd and related activity */ 25514330354fSAlan Stern hub_quiesce(hub, HUB_SUSPEND); 2552b6f6436dSAlan Stern return 0; 25531da177e4SLinus Torvalds } 25541da177e4SLinus Torvalds 25551da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 25561da177e4SLinus Torvalds { 25571da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 25581da177e4SLinus Torvalds 25595e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 2560f2835219SAlan Stern hub_activate(hub, HUB_RESUME); 25611da177e4SLinus Torvalds return 0; 25621da177e4SLinus Torvalds } 25631da177e4SLinus Torvalds 2564b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 2565f07600cfSAlan Stern { 2566b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 2567f07600cfSAlan Stern 25685e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 2569f2835219SAlan Stern hub_activate(hub, HUB_RESET_RESUME); 2570f07600cfSAlan Stern return 0; 2571f07600cfSAlan Stern } 2572f07600cfSAlan Stern 257354515fe5SAlan Stern /** 257454515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 257554515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 257654515fe5SAlan Stern * 257754515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 257854515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 2579feccc30dSAlan Stern * has been reset. The routine marks @rhdev as having lost power. 2580feccc30dSAlan Stern * When the hub driver is resumed it will take notice and carry out 2581feccc30dSAlan Stern * power-session recovery for all the "USB-PERSIST"-enabled child devices; 2582feccc30dSAlan Stern * the others will be disconnected. 258354515fe5SAlan Stern */ 258454515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 258554515fe5SAlan Stern { 258654515fe5SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 258754515fe5SAlan Stern rhdev->reset_resume = 1; 258854515fe5SAlan Stern } 258954515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 259054515fe5SAlan Stern 2591d388dab7SAlan Stern #else /* CONFIG_PM */ 2592d388dab7SAlan Stern 2593511366daSAndrew Morton #define hub_suspend NULL 2594511366daSAndrew Morton #define hub_resume NULL 2595f07600cfSAlan Stern #define hub_reset_resume NULL 2596d388dab7SAlan Stern #endif 2597d388dab7SAlan Stern 25981da177e4SLinus Torvalds 25991da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 26001da177e4SLinus Torvalds * 26011da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 26021da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 26031da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 26041da177e4SLinus Torvalds * 26051da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 26061da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 26071da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 26081da177e4SLinus Torvalds * 26091da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 26101da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 26111da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 26121da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 26131da177e4SLinus Torvalds */ 26141da177e4SLinus Torvalds static int hub_port_debounce(struct usb_hub *hub, int port1) 26151da177e4SLinus Torvalds { 26161da177e4SLinus Torvalds int ret; 26171da177e4SLinus Torvalds int total_time, stable_time = 0; 26181da177e4SLinus Torvalds u16 portchange, portstatus; 26191da177e4SLinus Torvalds unsigned connection = 0xffff; 26201da177e4SLinus Torvalds 26211da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 26221da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 26231da177e4SLinus Torvalds if (ret < 0) 26241da177e4SLinus Torvalds return ret; 26251da177e4SLinus Torvalds 26261da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 26271da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 26281da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 26291da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 26301da177e4SLinus Torvalds break; 26311da177e4SLinus Torvalds } else { 26321da177e4SLinus Torvalds stable_time = 0; 26331da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 26341da177e4SLinus Torvalds } 26351da177e4SLinus Torvalds 26361da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 26371da177e4SLinus Torvalds clear_port_feature(hub->hdev, port1, 26381da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 26391da177e4SLinus Torvalds } 26401da177e4SLinus Torvalds 26411da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 26421da177e4SLinus Torvalds break; 26431da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 26441da177e4SLinus Torvalds } 26451da177e4SLinus Torvalds 26461da177e4SLinus Torvalds dev_dbg (hub->intfdev, 26471da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 26481da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 26491da177e4SLinus Torvalds 26501da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 26511da177e4SLinus Torvalds return -ETIMEDOUT; 26521da177e4SLinus Torvalds return portstatus; 26531da177e4SLinus Torvalds } 26541da177e4SLinus Torvalds 2655fc721f51SInaky Perez-Gonzalez void usb_ep0_reinit(struct usb_device *udev) 26561da177e4SLinus Torvalds { 2657ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); 2658ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); 26592caf7fcdSAlan Stern usb_enable_endpoint(udev, &udev->ep0, true); 26601da177e4SLinus Torvalds } 2661fc721f51SInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_ep0_reinit); 26621da177e4SLinus Torvalds 26631da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 26641da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 26651da177e4SLinus Torvalds 26664326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 26671da177e4SLinus Torvalds { 26681da177e4SLinus Torvalds int retval; 2669c6515272SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 26701da177e4SLinus Torvalds 2671c6515272SSarah Sharp /* 2672c6515272SSarah Sharp * The host controller will choose the device address, 2673c6515272SSarah Sharp * instead of the core having chosen it earlier 2674c6515272SSarah Sharp */ 2675c6515272SSarah Sharp if (!hcd->driver->address_device && devnum <= 1) 26761da177e4SLinus Torvalds return -EINVAL; 26771da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 26781da177e4SLinus Torvalds return 0; 26791da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 26801da177e4SLinus Torvalds return -EINVAL; 2681c8d4af8eSAndiry Xu if (hcd->driver->address_device) 2682c6515272SSarah Sharp retval = hcd->driver->address_device(hcd, udev); 2683c8d4af8eSAndiry Xu else 26841da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 26854326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 26861da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 26871da177e4SLinus Torvalds if (retval == 0) { 26883b29b68bSAlan Stern update_devnum(udev, devnum); 26894953d141SDavid Vrabel /* Device now using proper address. */ 26901da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 2691fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 26921da177e4SLinus Torvalds } 26931da177e4SLinus Torvalds return retval; 26941da177e4SLinus Torvalds } 26951da177e4SLinus Torvalds 26961da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 26971da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 26981da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 26991da177e4SLinus Torvalds * 27001da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 2701742120c6SMing Lei * usb_reset_and_verify_device), the caller must own the device lock. For a 27021da177e4SLinus Torvalds * newly detected device that is not accessible through any global 27031da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 27041da177e4SLinus Torvalds */ 27051da177e4SLinus Torvalds static int 27061da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 27071da177e4SLinus Torvalds int retry_counter) 27081da177e4SLinus Torvalds { 27094186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 27101da177e4SLinus Torvalds 27111da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 2712e7b77172SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 27131da177e4SLinus Torvalds int i, j, retval; 27141da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 27151da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 271683a07196SInaky Perez-Gonzalez char *speed, *type; 27174326ed0bSAlan Stern int devnum = udev->devnum; 27181da177e4SLinus Torvalds 27191da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 27201da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 27211da177e4SLinus Torvalds */ 27221da177e4SLinus Torvalds if (!hdev->parent) { 27231da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 27241da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 27251da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 27261da177e4SLinus Torvalds } 27271da177e4SLinus Torvalds 27281da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 27291da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 27301da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 27311da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 27321da177e4SLinus Torvalds 27334186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 27341da177e4SLinus Torvalds 2735a5f0efabSSarah Sharp if (!udev->config && oldspeed == USB_SPEED_SUPER) { 2736e7b77172SSarah Sharp /* Don't reset USB 3.0 devices during an initial setup */ 2737e7b77172SSarah Sharp usb_set_device_state(udev, USB_STATE_DEFAULT); 2738e7b77172SSarah Sharp } else { 27391da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 2740e7b77172SSarah Sharp /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ 27411da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 27421da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 27431da177e4SLinus Torvalds goto fail; 27441da177e4SLinus Torvalds /* success, speed is known */ 2745e7b77172SSarah Sharp } 27461da177e4SLinus Torvalds retval = -ENODEV; 27471da177e4SLinus Torvalds 27481da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 27491da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 27501da177e4SLinus Torvalds goto fail; 27511da177e4SLinus Torvalds } 27521da177e4SLinus Torvalds oldspeed = udev->speed; 27531da177e4SLinus Torvalds 27541da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 27551da177e4SLinus Torvalds * it's fixed size except for full speed devices. 27565bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 27575bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 27581da177e4SLinus Torvalds */ 27591da177e4SLinus Torvalds switch (udev->speed) { 27606b403b02SSarah Sharp case USB_SPEED_SUPER: 2761551cdbbeSGreg Kroah-Hartman case USB_SPEED_WIRELESS: /* fixed at 512 */ 2762551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); 27635bb6e0aeSInaky Perez-Gonzalez break; 27641da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 2765551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 27661da177e4SLinus Torvalds break; 27671da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 27681da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 27691da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 27701da177e4SLinus Torvalds * then correct our initial guess. 27711da177e4SLinus Torvalds */ 2772551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 27731da177e4SLinus Torvalds break; 27741da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 2775551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); 27761da177e4SLinus Torvalds break; 27771da177e4SLinus Torvalds default: 27781da177e4SLinus Torvalds goto fail; 27791da177e4SLinus Torvalds } 27801da177e4SLinus Torvalds 278183a07196SInaky Perez-Gonzalez type = ""; 278283a07196SInaky Perez-Gonzalez switch (udev->speed) { 27831da177e4SLinus Torvalds case USB_SPEED_LOW: speed = "low"; break; 27841da177e4SLinus Torvalds case USB_SPEED_FULL: speed = "full"; break; 27851da177e4SLinus Torvalds case USB_SPEED_HIGH: speed = "high"; break; 27866b403b02SSarah Sharp case USB_SPEED_SUPER: 27876b403b02SSarah Sharp speed = "super"; 27886b403b02SSarah Sharp break; 2789551cdbbeSGreg Kroah-Hartman case USB_SPEED_WIRELESS: 279083a07196SInaky Perez-Gonzalez speed = "variable"; 279183a07196SInaky Perez-Gonzalez type = "Wireless "; 279283a07196SInaky Perez-Gonzalez break; 27931da177e4SLinus Torvalds default: speed = "?"; break; 279483a07196SInaky Perez-Gonzalez } 2795c6515272SSarah Sharp if (udev->speed != USB_SPEED_SUPER) 279683a07196SInaky Perez-Gonzalez dev_info(&udev->dev, 27973b29b68bSAlan Stern "%s %s speed %sUSB device number %d using %s\n", 279883a07196SInaky Perez-Gonzalez (udev->config) ? "reset" : "new", speed, type, 27993b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 28001da177e4SLinus Torvalds 28011da177e4SLinus Torvalds /* Set up TT records, if needed */ 28021da177e4SLinus Torvalds if (hdev->tt) { 28031da177e4SLinus Torvalds udev->tt = hdev->tt; 28041da177e4SLinus Torvalds udev->ttport = hdev->ttport; 28051da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 28061da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 2807d199c96dSAlan Stern if (!hub->tt.hub) { 2808d199c96dSAlan Stern dev_err(&udev->dev, "parent hub has no TT\n"); 2809d199c96dSAlan Stern retval = -EINVAL; 2810d199c96dSAlan Stern goto fail; 2811d199c96dSAlan Stern } 28121da177e4SLinus Torvalds udev->tt = &hub->tt; 28131da177e4SLinus Torvalds udev->ttport = port1; 28141da177e4SLinus Torvalds } 28151da177e4SLinus Torvalds 28161da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 28171da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 28181da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 28191da177e4SLinus Torvalds * Change it cautiously. 28201da177e4SLinus Torvalds * 28211da177e4SLinus Torvalds * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 28221da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 28231da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 28241da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 28251da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 28261da177e4SLinus Torvalds * value. 28271da177e4SLinus Torvalds */ 28281da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 2829c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) { 28301da177e4SLinus Torvalds struct usb_device_descriptor *buf; 28311da177e4SLinus Torvalds int r = 0; 28321da177e4SLinus Torvalds 28331da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 28341da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 28351da177e4SLinus Torvalds if (!buf) { 28361da177e4SLinus Torvalds retval = -ENOMEM; 28371da177e4SLinus Torvalds continue; 28381da177e4SLinus Torvalds } 28391da177e4SLinus Torvalds 2840b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 2841b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 2842b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 28431da177e4SLinus Torvalds */ 28441da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 28451da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 28461da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 28471da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 28481da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 28491da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 2850fd7c519dSJaroslav Kysela initial_descriptor_timeout); 28511da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 28525bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 28531da177e4SLinus Torvalds if (buf->bDescriptorType == 28541da177e4SLinus Torvalds USB_DT_DEVICE) { 28551da177e4SLinus Torvalds r = 0; 28561da177e4SLinus Torvalds break; 28571da177e4SLinus Torvalds } 28581da177e4SLinus Torvalds /* FALL THROUGH */ 28591da177e4SLinus Torvalds default: 28601da177e4SLinus Torvalds if (r == 0) 28611da177e4SLinus Torvalds r = -EPROTO; 28621da177e4SLinus Torvalds break; 28631da177e4SLinus Torvalds } 28641da177e4SLinus Torvalds if (r == 0) 28651da177e4SLinus Torvalds break; 28661da177e4SLinus Torvalds } 28671da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 28681da177e4SLinus Torvalds buf->bMaxPacketSize0; 28691da177e4SLinus Torvalds kfree(buf); 28701da177e4SLinus Torvalds 28711da177e4SLinus Torvalds retval = hub_port_reset(hub, port1, udev, delay); 28721da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 28731da177e4SLinus Torvalds goto fail; 28741da177e4SLinus Torvalds if (oldspeed != udev->speed) { 28751da177e4SLinus Torvalds dev_dbg(&udev->dev, 28761da177e4SLinus Torvalds "device reset changed speed!\n"); 28771da177e4SLinus Torvalds retval = -ENODEV; 28781da177e4SLinus Torvalds goto fail; 28791da177e4SLinus Torvalds } 28801da177e4SLinus Torvalds if (r) { 2881b9cef6c3SWu Fengguang dev_err(&udev->dev, 2882b9cef6c3SWu Fengguang "device descriptor read/64, error %d\n", 2883b9cef6c3SWu Fengguang r); 28841da177e4SLinus Torvalds retval = -EMSGSIZE; 28851da177e4SLinus Torvalds continue; 28861da177e4SLinus Torvalds } 28871da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 28881da177e4SLinus Torvalds } 28891da177e4SLinus Torvalds 28906c529cdcSInaky Perez-Gonzalez /* 28916c529cdcSInaky Perez-Gonzalez * If device is WUSB, we already assigned an 28926c529cdcSInaky Perez-Gonzalez * unauthorized address in the Connect Ack sequence; 28936c529cdcSInaky Perez-Gonzalez * authorization will assign the final address. 28946c529cdcSInaky Perez-Gonzalez */ 28956c529cdcSInaky Perez-Gonzalez if (udev->wusb == 0) { 28961da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 28974326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 28981da177e4SLinus Torvalds if (retval >= 0) 28991da177e4SLinus Torvalds break; 29001da177e4SLinus Torvalds msleep(200); 29011da177e4SLinus Torvalds } 29021da177e4SLinus Torvalds if (retval < 0) { 29031da177e4SLinus Torvalds dev_err(&udev->dev, 29041da177e4SLinus Torvalds "device not accepting address %d, error %d\n", 29054326ed0bSAlan Stern devnum, retval); 29061da177e4SLinus Torvalds goto fail; 29071da177e4SLinus Torvalds } 2908c6515272SSarah Sharp if (udev->speed == USB_SPEED_SUPER) { 2909c6515272SSarah Sharp devnum = udev->devnum; 2910c6515272SSarah Sharp dev_info(&udev->dev, 29113b29b68bSAlan Stern "%s SuperSpeed USB device number %d using %s\n", 2912c6515272SSarah Sharp (udev->config) ? "reset" : "new", 29133b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 2914c6515272SSarah Sharp } 29151da177e4SLinus Torvalds 29161da177e4SLinus Torvalds /* cope with hardware quirkiness: 29171da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 29181da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 29191da177e4SLinus Torvalds */ 29201da177e4SLinus Torvalds msleep(10); 2921c6515272SSarah Sharp if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) 29221da177e4SLinus Torvalds break; 29236c529cdcSInaky Perez-Gonzalez } 29241da177e4SLinus Torvalds 29251da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 29261da177e4SLinus Torvalds if (retval < 8) { 2927b9cef6c3SWu Fengguang dev_err(&udev->dev, 2928b9cef6c3SWu Fengguang "device descriptor read/8, error %d\n", 2929b9cef6c3SWu Fengguang retval); 29301da177e4SLinus Torvalds if (retval >= 0) 29311da177e4SLinus Torvalds retval = -EMSGSIZE; 29321da177e4SLinus Torvalds } else { 29331da177e4SLinus Torvalds retval = 0; 29341da177e4SLinus Torvalds break; 29351da177e4SLinus Torvalds } 29361da177e4SLinus Torvalds } 29371da177e4SLinus Torvalds if (retval) 29381da177e4SLinus Torvalds goto fail; 29391da177e4SLinus Torvalds 29406b403b02SSarah Sharp if (udev->descriptor.bMaxPacketSize0 == 0xff || 29416b403b02SSarah Sharp udev->speed == USB_SPEED_SUPER) 29426b403b02SSarah Sharp i = 512; 29436b403b02SSarah Sharp else 29446b403b02SSarah Sharp i = udev->descriptor.bMaxPacketSize0; 29451da177e4SLinus Torvalds if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { 294656626a72SAlan Stern if (udev->speed == USB_SPEED_LOW || 29471da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 294856626a72SAlan Stern dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); 29491da177e4SLinus Torvalds retval = -EMSGSIZE; 29501da177e4SLinus Torvalds goto fail; 29511da177e4SLinus Torvalds } 295256626a72SAlan Stern if (udev->speed == USB_SPEED_FULL) 29531da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 295456626a72SAlan Stern else 295556626a72SAlan Stern dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); 29561da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 2957fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 29581da177e4SLinus Torvalds } 29591da177e4SLinus Torvalds 29601da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 29611da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 2962b9cef6c3SWu Fengguang dev_err(&udev->dev, "device descriptor read/all, error %d\n", 2963b9cef6c3SWu Fengguang retval); 29641da177e4SLinus Torvalds if (retval >= 0) 29651da177e4SLinus Torvalds retval = -ENOMSG; 29661da177e4SLinus Torvalds goto fail; 29671da177e4SLinus Torvalds } 29681da177e4SLinus Torvalds 29691da177e4SLinus Torvalds retval = 0; 297048f24970SAlek Du /* notify HCD that we have a device connected and addressed */ 297148f24970SAlek Du if (hcd->driver->update_device) 297248f24970SAlek Du hcd->driver->update_device(hcd, udev); 29731da177e4SLinus Torvalds fail: 29744326ed0bSAlan Stern if (retval) { 29751da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 29763b29b68bSAlan Stern update_devnum(udev, devnum); /* for disconnect processing */ 29774326ed0bSAlan Stern } 29784186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 29791da177e4SLinus Torvalds return retval; 29801da177e4SLinus Torvalds } 29811da177e4SLinus Torvalds 29821da177e4SLinus Torvalds static void 29831da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 29841da177e4SLinus Torvalds { 29851da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 29861da177e4SLinus Torvalds int status; 29871da177e4SLinus Torvalds 2988e94b1766SChristoph Lameter qual = kmalloc (sizeof *qual, GFP_KERNEL); 29891da177e4SLinus Torvalds if (qual == NULL) 29901da177e4SLinus Torvalds return; 29911da177e4SLinus Torvalds 29921da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 29931da177e4SLinus Torvalds qual, sizeof *qual); 29941da177e4SLinus Torvalds if (status == sizeof *qual) { 29951da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 29961da177e4SLinus Torvalds "connect to a high speed hub\n"); 29971da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 29981da177e4SLinus Torvalds if (hub->has_indicators) { 29991da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 3000c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 30011da177e4SLinus Torvalds } 30021da177e4SLinus Torvalds } 30031da177e4SLinus Torvalds kfree(qual); 30041da177e4SLinus Torvalds } 30051da177e4SLinus Torvalds 30061da177e4SLinus Torvalds static unsigned 30071da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 30081da177e4SLinus Torvalds { 30091da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 30101da177e4SLinus Torvalds int remaining; 301155c52718SAlan Stern int port1; 30121da177e4SLinus Torvalds 301355c52718SAlan Stern if (!hub->limited_power) 30141da177e4SLinus Torvalds return 0; 30151da177e4SLinus Torvalds 301655c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 301755c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 301855c52718SAlan Stern struct usb_device *udev = hdev->children[port1 - 1]; 301955c52718SAlan Stern int delta; 30201da177e4SLinus Torvalds 30211da177e4SLinus Torvalds if (!udev) 30221da177e4SLinus Torvalds continue; 30231da177e4SLinus Torvalds 302455c52718SAlan Stern /* Unconfigured devices may not use more than 100mA, 302555c52718SAlan Stern * or 8mA for OTG ports */ 30261da177e4SLinus Torvalds if (udev->actconfig) 302755c52718SAlan Stern delta = udev->actconfig->desc.bMaxPower * 2; 302855c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 302955c52718SAlan Stern delta = 100; 30301da177e4SLinus Torvalds else 303155c52718SAlan Stern delta = 8; 303255c52718SAlan Stern if (delta > hub->mA_per_port) 3033b9cef6c3SWu Fengguang dev_warn(&udev->dev, 3034b9cef6c3SWu Fengguang "%dmA is over %umA budget for port %d!\n", 303555c52718SAlan Stern delta, hub->mA_per_port, port1); 30361da177e4SLinus Torvalds remaining -= delta; 30371da177e4SLinus Torvalds } 30381da177e4SLinus Torvalds if (remaining < 0) { 303955c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 304055c52718SAlan Stern - remaining); 30411da177e4SLinus Torvalds remaining = 0; 30421da177e4SLinus Torvalds } 30431da177e4SLinus Torvalds return remaining; 30441da177e4SLinus Torvalds } 30451da177e4SLinus Torvalds 30461da177e4SLinus Torvalds /* Handle physical or logical connection change events. 30471da177e4SLinus Torvalds * This routine is called when: 30481da177e4SLinus Torvalds * a port connection-change occurs; 30491da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 3050742120c6SMing Lei * usb_reset_and_verify_device() encounters changed descriptors (as from 30511da177e4SLinus Torvalds * a firmware download) 30521da177e4SLinus Torvalds * caller already locked the hub 30531da177e4SLinus Torvalds */ 30541da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 30551da177e4SLinus Torvalds u16 portstatus, u16 portchange) 30561da177e4SLinus Torvalds { 30571da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 30581da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 305990da096eSBalaji Rao struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 306024618b0cSAlan Stern unsigned wHubCharacteristics = 306124618b0cSAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 30628808f00cSAlan Stern struct usb_device *udev; 30631da177e4SLinus Torvalds int status, i; 30641da177e4SLinus Torvalds 30651da177e4SLinus Torvalds dev_dbg (hub_dev, 30661da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 3067131dec34SSarah Sharp port1, portstatus, portchange, portspeed(hub, portstatus)); 30681da177e4SLinus Torvalds 30691da177e4SLinus Torvalds if (hub->has_indicators) { 30701da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 30711da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 30721da177e4SLinus Torvalds } 30731da177e4SLinus Torvalds 30741da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 30751da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 30761da177e4SLinus Torvalds if (hdev->bus->is_b_host) 307724618b0cSAlan Stern portchange &= ~(USB_PORT_STAT_C_CONNECTION | 307824618b0cSAlan Stern USB_PORT_STAT_C_ENABLE); 30791da177e4SLinus Torvalds #endif 30801da177e4SLinus Torvalds 30818808f00cSAlan Stern /* Try to resuscitate an existing device */ 30828808f00cSAlan Stern udev = hdev->children[port1-1]; 30838808f00cSAlan Stern if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && 30848808f00cSAlan Stern udev->state != USB_STATE_NOTATTACHED) { 30858808f00cSAlan Stern usb_lock_device(udev); 30868808f00cSAlan Stern if (portstatus & USB_PORT_STAT_ENABLE) { 30878808f00cSAlan Stern status = 0; /* Nothing to do */ 30888808f00cSAlan Stern 30898808f00cSAlan Stern #ifdef CONFIG_USB_SUSPEND 30905257d97aSAlan Stern } else if (udev->state == USB_STATE_SUSPENDED && 30915257d97aSAlan Stern udev->persist_enabled) { 30928808f00cSAlan Stern /* For a suspended device, treat this as a 30938808f00cSAlan Stern * remote wakeup event. 30948808f00cSAlan Stern */ 30950534d468SAlan Stern status = usb_remote_wakeup(udev); 30968808f00cSAlan Stern #endif 30978808f00cSAlan Stern 30988808f00cSAlan Stern } else { 30995257d97aSAlan Stern status = -ENODEV; /* Don't resuscitate */ 31008808f00cSAlan Stern } 31018808f00cSAlan Stern usb_unlock_device(udev); 31028808f00cSAlan Stern 31038808f00cSAlan Stern if (status == 0) { 31048808f00cSAlan Stern clear_bit(port1, hub->change_bits); 31058808f00cSAlan Stern return; 31068808f00cSAlan Stern } 31078808f00cSAlan Stern } 31088808f00cSAlan Stern 310924618b0cSAlan Stern /* Disconnect any existing devices under this port */ 31108808f00cSAlan Stern if (udev) 311124618b0cSAlan Stern usb_disconnect(&hdev->children[port1-1]); 311224618b0cSAlan Stern clear_bit(port1, hub->change_bits); 311324618b0cSAlan Stern 3114253e0572SAlan Stern /* We can forget about a "removed" device when there's a physical 3115253e0572SAlan Stern * disconnect or the connect status changes. 3116253e0572SAlan Stern */ 3117253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 3118253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 3119253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 3120253e0572SAlan Stern 31215257d97aSAlan Stern if (portchange & (USB_PORT_STAT_C_CONNECTION | 31225257d97aSAlan Stern USB_PORT_STAT_C_ENABLE)) { 31235257d97aSAlan Stern status = hub_port_debounce(hub, port1); 31245257d97aSAlan Stern if (status < 0) { 31255257d97aSAlan Stern if (printk_ratelimit()) 31265257d97aSAlan Stern dev_err(hub_dev, "connect-debounce failed, " 31275257d97aSAlan Stern "port %d disabled\n", port1); 31285257d97aSAlan Stern portstatus &= ~USB_PORT_STAT_CONNECTION; 31295257d97aSAlan Stern } else { 31305257d97aSAlan Stern portstatus = status; 31315257d97aSAlan Stern } 31325257d97aSAlan Stern } 31335257d97aSAlan Stern 3134253e0572SAlan Stern /* Return now if debouncing failed or nothing is connected or 3135253e0572SAlan Stern * the device was "removed". 3136253e0572SAlan Stern */ 3137253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 3138253e0572SAlan Stern test_bit(port1, hub->removed_bits)) { 31391da177e4SLinus Torvalds 31401da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 314174ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 3142749da5f8SAlan Stern && !(portstatus & USB_PORT_STAT_POWER)) 31431da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 31441da177e4SLinus Torvalds 31451da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 31461da177e4SLinus Torvalds goto done; 31471da177e4SLinus Torvalds return; 31481da177e4SLinus Torvalds } 31491da177e4SLinus Torvalds 31501da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 31511da177e4SLinus Torvalds 31521da177e4SLinus Torvalds /* reallocate for each attempt, since references 31531da177e4SLinus Torvalds * to the previous one can escape in various ways 31541da177e4SLinus Torvalds */ 31551da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 31561da177e4SLinus Torvalds if (!udev) { 31571da177e4SLinus Torvalds dev_err (hub_dev, 31581da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 31591da177e4SLinus Torvalds port1); 31601da177e4SLinus Torvalds goto done; 31611da177e4SLinus Torvalds } 31621da177e4SLinus Torvalds 31631da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 316455c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 3165b6956ffaSAlan Stern udev->level = hdev->level + 1; 31668af548dcSInaky Perez-Gonzalez udev->wusb = hub_is_wusb(hub); 31671da177e4SLinus Torvalds 3168131dec34SSarah Sharp /* Only USB 3.0 devices are connected to SuperSpeed hubs. */ 3169131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 3170e7b77172SSarah Sharp udev->speed = USB_SPEED_SUPER; 3171e7b77172SSarah Sharp else 3172e7b77172SSarah Sharp udev->speed = USB_SPEED_UNKNOWN; 3173e7b77172SSarah Sharp 31743b29b68bSAlan Stern choose_devnum(udev); 3175c6515272SSarah Sharp if (udev->devnum <= 0) { 3176c6515272SSarah Sharp status = -ENOTCONN; /* Don't retry */ 3177c6515272SSarah Sharp goto loop; 3178c6515272SSarah Sharp } 3179c6515272SSarah Sharp 3180e7b77172SSarah Sharp /* reset (non-USB 3.0 devices) and get descriptor */ 31811da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 31821da177e4SLinus Torvalds if (status < 0) 31831da177e4SLinus Torvalds goto loop; 31841da177e4SLinus Torvalds 318593362a87SPhil Dibowitz usb_detect_quirks(udev); 318693362a87SPhil Dibowitz if (udev->quirks & USB_QUIRK_DELAY_INIT) 318793362a87SPhil Dibowitz msleep(1000); 318893362a87SPhil Dibowitz 31891da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 31901da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 31911da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 31921da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 31931da177e4SLinus Torvalds * on the parent. 31941da177e4SLinus Torvalds */ 31951da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 319655c52718SAlan Stern && udev->bus_mA <= 100) { 31971da177e4SLinus Torvalds u16 devstat; 31981da177e4SLinus Torvalds 31991da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 32001da177e4SLinus Torvalds &devstat); 320155c52718SAlan Stern if (status < 2) { 32021da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 32031da177e4SLinus Torvalds goto loop_disable; 32041da177e4SLinus Torvalds } 320555c52718SAlan Stern le16_to_cpus(&devstat); 32061da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 32071da177e4SLinus Torvalds dev_err(&udev->dev, 32081da177e4SLinus Torvalds "can't connect bus-powered hub " 32091da177e4SLinus Torvalds "to this port\n"); 32101da177e4SLinus Torvalds if (hub->has_indicators) { 32111da177e4SLinus Torvalds hub->indicator[port1-1] = 32121da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 3213c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 32141da177e4SLinus Torvalds } 32151da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 32161da177e4SLinus Torvalds goto loop_disable; 32171da177e4SLinus Torvalds } 32181da177e4SLinus Torvalds } 32191da177e4SLinus Torvalds 32201da177e4SLinus Torvalds /* check for devices running slower than they could */ 32211da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 32221da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 32231da177e4SLinus Torvalds && highspeed_hubs != 0) 32241da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 32251da177e4SLinus Torvalds 32261da177e4SLinus Torvalds /* Store the parent's children[] pointer. At this point 32271da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 32281da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 32291da177e4SLinus Torvalds */ 32301da177e4SLinus Torvalds status = 0; 32311da177e4SLinus Torvalds 32321da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 32331da177e4SLinus Torvalds * been disconnected; we would race with the 32341da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 32351da177e4SLinus Torvalds */ 32361da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 32371da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 32381da177e4SLinus Torvalds status = -ENOTCONN; 32391da177e4SLinus Torvalds else 32401da177e4SLinus Torvalds hdev->children[port1-1] = udev; 32411da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 32421da177e4SLinus Torvalds 32431da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 32441da177e4SLinus Torvalds if (!status) { 32451da177e4SLinus Torvalds status = usb_new_device(udev); 32461da177e4SLinus Torvalds if (status) { 32471da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 32481da177e4SLinus Torvalds hdev->children[port1-1] = NULL; 32491da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 32501da177e4SLinus Torvalds } 32511da177e4SLinus Torvalds } 32521da177e4SLinus Torvalds 32531da177e4SLinus Torvalds if (status) 32541da177e4SLinus Torvalds goto loop_disable; 32551da177e4SLinus Torvalds 32561da177e4SLinus Torvalds status = hub_power_remaining(hub); 32571da177e4SLinus Torvalds if (status) 325855c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 32591da177e4SLinus Torvalds 32601da177e4SLinus Torvalds return; 32611da177e4SLinus Torvalds 32621da177e4SLinus Torvalds loop_disable: 32631da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 32641da177e4SLinus Torvalds loop: 3265fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 32663b29b68bSAlan Stern release_devnum(udev); 3267f7410cedSHerbert Xu hub_free_dev(udev); 32681da177e4SLinus Torvalds usb_put_dev(udev); 3269ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 32701da177e4SLinus Torvalds break; 32711da177e4SLinus Torvalds } 32723a31155cSAlan Stern if (hub->hdev->parent || 32733a31155cSAlan Stern !hcd->driver->port_handed_over || 32743a31155cSAlan Stern !(hcd->driver->port_handed_over)(hcd, port1)) 32753a31155cSAlan Stern dev_err(hub_dev, "unable to enumerate USB device on port %d\n", 32763a31155cSAlan Stern port1); 32771da177e4SLinus Torvalds 32781da177e4SLinus Torvalds done: 32791da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 328090da096eSBalaji Rao if (hcd->driver->relinquish_port && !hub->hdev->parent) 328190da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 32821da177e4SLinus Torvalds } 32831da177e4SLinus Torvalds 32841da177e4SLinus Torvalds static void hub_events(void) 32851da177e4SLinus Torvalds { 32861da177e4SLinus Torvalds struct list_head *tmp; 32871da177e4SLinus Torvalds struct usb_device *hdev; 32881da177e4SLinus Torvalds struct usb_interface *intf; 32891da177e4SLinus Torvalds struct usb_hub *hub; 32901da177e4SLinus Torvalds struct device *hub_dev; 32911da177e4SLinus Torvalds u16 hubstatus; 32921da177e4SLinus Torvalds u16 hubchange; 32931da177e4SLinus Torvalds u16 portstatus; 32941da177e4SLinus Torvalds u16 portchange; 32951da177e4SLinus Torvalds int i, ret; 32961da177e4SLinus Torvalds int connect_change; 32971da177e4SLinus Torvalds 32981da177e4SLinus Torvalds /* 32991da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 33001da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 33011da177e4SLinus Torvalds * safe since we delete the hub from the event list. 33021da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 33031da177e4SLinus Torvalds */ 33041da177e4SLinus Torvalds while (1) { 33051da177e4SLinus Torvalds 33061da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 33071da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 33081da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 33091da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 33101da177e4SLinus Torvalds break; 33111da177e4SLinus Torvalds } 33121da177e4SLinus Torvalds 33131da177e4SLinus Torvalds tmp = hub_event_list.next; 33141da177e4SLinus Torvalds list_del_init(tmp); 33151da177e4SLinus Torvalds 33161da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 3317e8054854SAlan Stern kref_get(&hub->kref); 3318e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 33191da177e4SLinus Torvalds 3320e8054854SAlan Stern hdev = hub->hdev; 3321e8054854SAlan Stern hub_dev = hub->intfdev; 3322e8054854SAlan Stern intf = to_usb_interface(hub_dev); 332340f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 33241da177e4SLinus Torvalds hdev->state, hub->descriptor 33251da177e4SLinus Torvalds ? hub->descriptor->bNbrPorts 33261da177e4SLinus Torvalds : 0, 33271da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 33281da177e4SLinus Torvalds (u16) hub->change_bits[0], 332940f122f3SAlan Stern (u16) hub->event_bits[0]); 33301da177e4SLinus Torvalds 33311da177e4SLinus Torvalds /* Lock the device, then check to see if we were 33321da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 333306b84e8aSAlan Stern usb_lock_device(hdev); 3334e8054854SAlan Stern if (unlikely(hub->disconnected)) 33359bbdf1e0SAlan Stern goto loop_disconnected; 33361da177e4SLinus Torvalds 33371da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 33381da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 33397de18d8bSAlan Stern hub->error = -ENODEV; 33404330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 33411da177e4SLinus Torvalds goto loop; 33421da177e4SLinus Torvalds } 33431da177e4SLinus Torvalds 334440f122f3SAlan Stern /* Autoresume */ 334540f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 334640f122f3SAlan Stern if (ret) { 334740f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 33481da177e4SLinus Torvalds goto loop; 334940f122f3SAlan Stern } 335040f122f3SAlan Stern 335140f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 335240f122f3SAlan Stern if (hub->quiescing) 335340f122f3SAlan Stern goto loop_autopm; 33541da177e4SLinus Torvalds 33551da177e4SLinus Torvalds if (hub->error) { 33561da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 33571da177e4SLinus Torvalds hub->error); 33581da177e4SLinus Torvalds 3359742120c6SMing Lei ret = usb_reset_device(hdev); 33601da177e4SLinus Torvalds if (ret) { 33611da177e4SLinus Torvalds dev_dbg (hub_dev, 33621da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 336340f122f3SAlan Stern goto loop_autopm; 33641da177e4SLinus Torvalds } 33651da177e4SLinus Torvalds 33661da177e4SLinus Torvalds hub->nerrors = 0; 33671da177e4SLinus Torvalds hub->error = 0; 33681da177e4SLinus Torvalds } 33691da177e4SLinus Torvalds 33701da177e4SLinus Torvalds /* deal with port status changes */ 33711da177e4SLinus Torvalds for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { 33721da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 33731da177e4SLinus Torvalds continue; 33741da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 33751da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 33766ee0b270SAlan Stern !connect_change) 33771da177e4SLinus Torvalds continue; 33781da177e4SLinus Torvalds 33791da177e4SLinus Torvalds ret = hub_port_status(hub, i, 33801da177e4SLinus Torvalds &portstatus, &portchange); 33811da177e4SLinus Torvalds if (ret < 0) 33821da177e4SLinus Torvalds continue; 33831da177e4SLinus Torvalds 33841da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 33851da177e4SLinus Torvalds clear_port_feature(hdev, i, 33861da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 33871da177e4SLinus Torvalds connect_change = 1; 33881da177e4SLinus Torvalds } 33891da177e4SLinus Torvalds 33901da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 33911da177e4SLinus Torvalds if (!connect_change) 33921da177e4SLinus Torvalds dev_dbg (hub_dev, 33931da177e4SLinus Torvalds "port %d enable change, " 33941da177e4SLinus Torvalds "status %08x\n", 33951da177e4SLinus Torvalds i, portstatus); 33961da177e4SLinus Torvalds clear_port_feature(hdev, i, 33971da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 33981da177e4SLinus Torvalds 33991da177e4SLinus Torvalds /* 34001da177e4SLinus Torvalds * EM interference sometimes causes badly 34011da177e4SLinus Torvalds * shielded USB devices to be shutdown by 34021da177e4SLinus Torvalds * the hub, this hack enables them again. 34031da177e4SLinus Torvalds * Works at least with mouse driver. 34041da177e4SLinus Torvalds */ 34051da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 34061da177e4SLinus Torvalds && !connect_change 34071da177e4SLinus Torvalds && hdev->children[i-1]) { 34081da177e4SLinus Torvalds dev_err (hub_dev, 34091da177e4SLinus Torvalds "port %i " 34101da177e4SLinus Torvalds "disabled by hub (EMI?), " 34111da177e4SLinus Torvalds "re-enabling...\n", 34121da177e4SLinus Torvalds i); 34131da177e4SLinus Torvalds connect_change = 1; 34141da177e4SLinus Torvalds } 34151da177e4SLinus Torvalds } 34161da177e4SLinus Torvalds 34171da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_SUSPEND) { 34188808f00cSAlan Stern struct usb_device *udev; 34198808f00cSAlan Stern 34201da177e4SLinus Torvalds clear_port_feature(hdev, i, 34211da177e4SLinus Torvalds USB_PORT_FEAT_C_SUSPEND); 34228808f00cSAlan Stern udev = hdev->children[i-1]; 34238808f00cSAlan Stern if (udev) { 342449d0f078SAlan Stern /* TRSMRCY = 10 msec */ 342549d0f078SAlan Stern msleep(10); 342649d0f078SAlan Stern 34278808f00cSAlan Stern usb_lock_device(udev); 34280534d468SAlan Stern ret = usb_remote_wakeup(hdev-> 34291da177e4SLinus Torvalds children[i-1]); 34308808f00cSAlan Stern usb_unlock_device(udev); 34311da177e4SLinus Torvalds if (ret < 0) 34321da177e4SLinus Torvalds connect_change = 1; 34331da177e4SLinus Torvalds } else { 34341da177e4SLinus Torvalds ret = -ENODEV; 34351da177e4SLinus Torvalds hub_port_disable(hub, i, 1); 34361da177e4SLinus Torvalds } 34371da177e4SLinus Torvalds dev_dbg (hub_dev, 34381da177e4SLinus Torvalds "resume on port %d, status %d\n", 34391da177e4SLinus Torvalds i, ret); 34401da177e4SLinus Torvalds } 34411da177e4SLinus Torvalds 34421da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 3443752d57a8SPaul Bolle u16 status = 0; 3444752d57a8SPaul Bolle u16 unused; 3445752d57a8SPaul Bolle 3446752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change on port " 3447752d57a8SPaul Bolle "%d\n", i); 34481da177e4SLinus Torvalds clear_port_feature(hdev, i, 34491da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 3450752d57a8SPaul Bolle msleep(100); /* Cool down */ 34518520f380SAlan Stern hub_power_on(hub, true); 3452752d57a8SPaul Bolle hub_port_status(hub, i, &status, &unused); 3453752d57a8SPaul Bolle if (status & USB_PORT_STAT_OVERCURRENT) 3454752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 3455752d57a8SPaul Bolle "condition on port %d\n", i); 34561da177e4SLinus Torvalds } 34571da177e4SLinus Torvalds 34581da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 34591da177e4SLinus Torvalds dev_dbg (hub_dev, 34601da177e4SLinus Torvalds "reset change on port %d\n", 34611da177e4SLinus Torvalds i); 34621da177e4SLinus Torvalds clear_port_feature(hdev, i, 34631da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 34641da177e4SLinus Torvalds } 3465c7061574SSarah Sharp if ((portchange & USB_PORT_STAT_C_BH_RESET) && 3466c7061574SSarah Sharp hub_is_superspeed(hub->hdev)) { 3467c7061574SSarah Sharp dev_dbg(hub_dev, 3468c7061574SSarah Sharp "warm reset change on port %d\n", 3469c7061574SSarah Sharp i); 3470c7061574SSarah Sharp clear_port_feature(hdev, i, 3471c7061574SSarah Sharp USB_PORT_FEAT_C_BH_PORT_RESET); 3472c7061574SSarah Sharp } 3473dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_LINK_STATE) { 3474dbe79bbeSJohn Youn clear_port_feature(hub->hdev, i, 3475dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_LINK_STATE); 3476dbe79bbeSJohn Youn } 3477dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { 3478dbe79bbeSJohn Youn dev_warn(hub_dev, 3479dbe79bbeSJohn Youn "config error on port %d\n", 3480dbe79bbeSJohn Youn i); 3481dbe79bbeSJohn Youn clear_port_feature(hub->hdev, i, 3482dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_CONFIG_ERROR); 3483dbe79bbeSJohn Youn } 34841da177e4SLinus Torvalds 34851da177e4SLinus Torvalds if (connect_change) 34861da177e4SLinus Torvalds hub_port_connect_change(hub, i, 34871da177e4SLinus Torvalds portstatus, portchange); 34881da177e4SLinus Torvalds } /* end for i */ 34891da177e4SLinus Torvalds 34901da177e4SLinus Torvalds /* deal with hub status changes */ 34911da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 34921da177e4SLinus Torvalds ; /* do nothing */ 34931da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 34941da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 34951da177e4SLinus Torvalds else { 34961da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 34971da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 34981da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 349955c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 350055c52718SAlan Stern /* FIXME: Is this always true? */ 350155c52718SAlan Stern hub->limited_power = 1; 3502403fae78Sjidong xiao else 3503403fae78Sjidong xiao hub->limited_power = 0; 35041da177e4SLinus Torvalds } 35051da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 3506752d57a8SPaul Bolle u16 status = 0; 3507752d57a8SPaul Bolle u16 unused; 3508752d57a8SPaul Bolle 3509752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change\n"); 35101da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 3511752d57a8SPaul Bolle msleep(500); /* Cool down */ 35128520f380SAlan Stern hub_power_on(hub, true); 3513752d57a8SPaul Bolle hub_hub_status(hub, &status, &unused); 3514752d57a8SPaul Bolle if (status & HUB_STATUS_OVERCURRENT) 3515752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 3516752d57a8SPaul Bolle "condition\n"); 35171da177e4SLinus Torvalds } 35181da177e4SLinus Torvalds } 35191da177e4SLinus Torvalds 352040f122f3SAlan Stern loop_autopm: 35218e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface() above */ 35228e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 35231da177e4SLinus Torvalds loop: 35248e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface_no_resume() in 35258e4ceb38SAlan Stern * kick_khubd() and allow autosuspend. 35268e4ceb38SAlan Stern */ 35278e4ceb38SAlan Stern usb_autopm_put_interface(intf); 35289bbdf1e0SAlan Stern loop_disconnected: 35291da177e4SLinus Torvalds usb_unlock_device(hdev); 3530e8054854SAlan Stern kref_put(&hub->kref, hub_release); 35311da177e4SLinus Torvalds 35321da177e4SLinus Torvalds } /* end while (1) */ 35331da177e4SLinus Torvalds } 35341da177e4SLinus Torvalds 35351da177e4SLinus Torvalds static int hub_thread(void *__unused) 35361da177e4SLinus Torvalds { 35373bb1af52SAlan Stern /* khubd needs to be freezable to avoid intefering with USB-PERSIST 35383bb1af52SAlan Stern * port handover. Otherwise it might see that a full-speed device 35393bb1af52SAlan Stern * was gone before the EHCI controller had handed its port over to 35403bb1af52SAlan Stern * the companion full-speed controller. 35413bb1af52SAlan Stern */ 354283144186SRafael J. Wysocki set_freezable(); 35433bb1af52SAlan Stern 35441da177e4SLinus Torvalds do { 35451da177e4SLinus Torvalds hub_events(); 3546e42837bcSRafael J. Wysocki wait_event_freezable(khubd_wait, 35479c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 35489c8d6178Sakpm@osdl.org kthread_should_stop()); 35499c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 35501da177e4SLinus Torvalds 35511da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 35529c8d6178Sakpm@osdl.org return 0; 35531da177e4SLinus Torvalds } 35541da177e4SLinus Torvalds 35551e927d96SNémeth Márton static const struct usb_device_id hub_id_table[] = { 35561da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 35571da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 35581da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 35591da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 35601da177e4SLinus Torvalds { } /* Terminating entry */ 35611da177e4SLinus Torvalds }; 35621da177e4SLinus Torvalds 35631da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 35641da177e4SLinus Torvalds 35651da177e4SLinus Torvalds static struct usb_driver hub_driver = { 35661da177e4SLinus Torvalds .name = "hub", 35671da177e4SLinus Torvalds .probe = hub_probe, 35681da177e4SLinus Torvalds .disconnect = hub_disconnect, 35691da177e4SLinus Torvalds .suspend = hub_suspend, 35701da177e4SLinus Torvalds .resume = hub_resume, 3571f07600cfSAlan Stern .reset_resume = hub_reset_resume, 35727de18d8bSAlan Stern .pre_reset = hub_pre_reset, 35737de18d8bSAlan Stern .post_reset = hub_post_reset, 3574c532b29aSAndi Kleen .unlocked_ioctl = hub_ioctl, 35751da177e4SLinus Torvalds .id_table = hub_id_table, 357640f122f3SAlan Stern .supports_autosuspend = 1, 35771da177e4SLinus Torvalds }; 35781da177e4SLinus Torvalds 35791da177e4SLinus Torvalds int usb_hub_init(void) 35801da177e4SLinus Torvalds { 35811da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 35821da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 35831da177e4SLinus Torvalds usbcore_name); 35841da177e4SLinus Torvalds return -1; 35851da177e4SLinus Torvalds } 35861da177e4SLinus Torvalds 35879c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 35889c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 35891da177e4SLinus Torvalds return 0; 35901da177e4SLinus Torvalds 35911da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 35921da177e4SLinus Torvalds usb_deregister(&hub_driver); 35931da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 35941da177e4SLinus Torvalds 35951da177e4SLinus Torvalds return -1; 35961da177e4SLinus Torvalds } 35971da177e4SLinus Torvalds 35981da177e4SLinus Torvalds void usb_hub_cleanup(void) 35991da177e4SLinus Torvalds { 36009c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 36011da177e4SLinus Torvalds 36021da177e4SLinus Torvalds /* 36031da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 36041da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 36051da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 36061da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 36071da177e4SLinus Torvalds * individual hub resources. -greg 36081da177e4SLinus Torvalds */ 36091da177e4SLinus Torvalds usb_deregister(&hub_driver); 36101da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 36111da177e4SLinus Torvalds 3612eb764c4bSAlan Stern static int descriptors_changed(struct usb_device *udev, 3613eb764c4bSAlan Stern struct usb_device_descriptor *old_device_descriptor) 36141da177e4SLinus Torvalds { 3615eb764c4bSAlan Stern int changed = 0; 36161da177e4SLinus Torvalds unsigned index; 3617eb764c4bSAlan Stern unsigned serial_len = 0; 3618eb764c4bSAlan Stern unsigned len; 3619eb764c4bSAlan Stern unsigned old_length; 3620eb764c4bSAlan Stern int length; 3621eb764c4bSAlan Stern char *buf; 36221da177e4SLinus Torvalds 3623eb764c4bSAlan Stern if (memcmp(&udev->descriptor, old_device_descriptor, 3624eb764c4bSAlan Stern sizeof(*old_device_descriptor)) != 0) 3625eb764c4bSAlan Stern return 1; 3626eb764c4bSAlan Stern 3627eb764c4bSAlan Stern /* Since the idVendor, idProduct, and bcdDevice values in the 3628eb764c4bSAlan Stern * device descriptor haven't changed, we will assume the 3629eb764c4bSAlan Stern * Manufacturer and Product strings haven't changed either. 3630eb764c4bSAlan Stern * But the SerialNumber string could be different (e.g., a 3631eb764c4bSAlan Stern * different flash card of the same brand). 3632eb764c4bSAlan Stern */ 3633eb764c4bSAlan Stern if (udev->serial) 3634eb764c4bSAlan Stern serial_len = strlen(udev->serial) + 1; 3635eb764c4bSAlan Stern 3636eb764c4bSAlan Stern len = serial_len; 36371da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 3638eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 3639eb764c4bSAlan Stern len = max(len, old_length); 36401da177e4SLinus Torvalds } 3641eb764c4bSAlan Stern 36420cc1a51fSOliver Neukum buf = kmalloc(len, GFP_NOIO); 36431da177e4SLinus Torvalds if (buf == NULL) { 36441da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 36451da177e4SLinus Torvalds /* assume the worst */ 36461da177e4SLinus Torvalds return 1; 36471da177e4SLinus Torvalds } 36481da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 3649eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 36501da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 36511da177e4SLinus Torvalds old_length); 3652eb764c4bSAlan Stern if (length != old_length) { 36531da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 36541da177e4SLinus Torvalds index, length); 3655eb764c4bSAlan Stern changed = 1; 36561da177e4SLinus Torvalds break; 36571da177e4SLinus Torvalds } 36581da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 36591da177e4SLinus Torvalds != 0) { 36601da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 3661eb764c4bSAlan Stern index, 3662eb764c4bSAlan Stern ((struct usb_config_descriptor *) buf)-> 3663eb764c4bSAlan Stern bConfigurationValue); 3664eb764c4bSAlan Stern changed = 1; 36651da177e4SLinus Torvalds break; 36661da177e4SLinus Torvalds } 36671da177e4SLinus Torvalds } 3668eb764c4bSAlan Stern 3669eb764c4bSAlan Stern if (!changed && serial_len) { 3670eb764c4bSAlan Stern length = usb_string(udev, udev->descriptor.iSerialNumber, 3671eb764c4bSAlan Stern buf, serial_len); 3672eb764c4bSAlan Stern if (length + 1 != serial_len) { 3673eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string error %d\n", 3674eb764c4bSAlan Stern length); 3675eb764c4bSAlan Stern changed = 1; 3676eb764c4bSAlan Stern } else if (memcmp(buf, udev->serial, length) != 0) { 3677eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string changed\n"); 3678eb764c4bSAlan Stern changed = 1; 3679eb764c4bSAlan Stern } 3680eb764c4bSAlan Stern } 3681eb764c4bSAlan Stern 36821da177e4SLinus Torvalds kfree(buf); 3683eb764c4bSAlan Stern return changed; 36841da177e4SLinus Torvalds } 36851da177e4SLinus Torvalds 36861da177e4SLinus Torvalds /** 3687742120c6SMing Lei * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device 36881da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 36891da177e4SLinus Torvalds * 369079efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 369179efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 3692742120c6SMing Lei * Use usb_reset_device() instead. 36931da177e4SLinus Torvalds * 36941da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 36951da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 36961da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 36971da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 36981da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 36991da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 37001da177e4SLinus Torvalds * re-enumerated and probed all over again. 37011da177e4SLinus Torvalds * 37021da177e4SLinus Torvalds * Returns 0 if the reset succeeded, -ENODEV if the device has been 37031da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 37041da177e4SLinus Torvalds * if the reset wasn't even attempted. 37051da177e4SLinus Torvalds * 37061da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 37071da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 37081da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 37091da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 37106bc6cff5SAlan Stern * 37116bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 37126bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 37136bc6cff5SAlan Stern * holding the device lock because these tasks should always call 37146bc6cff5SAlan Stern * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. 37151da177e4SLinus Torvalds */ 3716742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev) 37171da177e4SLinus Torvalds { 37181da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 37191da177e4SLinus Torvalds struct usb_hub *parent_hub; 37203f0479e0SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 37211da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 372212c3da34SAlan Stern int i, ret = 0; 372312c3da34SAlan Stern int port1 = udev->portnum; 37241da177e4SLinus Torvalds 37251da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 37261da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 37271da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 37281da177e4SLinus Torvalds udev->state); 37291da177e4SLinus Torvalds return -EINVAL; 37301da177e4SLinus Torvalds } 37311da177e4SLinus Torvalds 37321da177e4SLinus Torvalds if (!parent_hdev) { 37334bec9917SWolfram Sang /* this requires hcd-specific logic; see ohci_restart() */ 3734441b62c1SHarvey Harrison dev_dbg(&udev->dev, "%s for root hub!\n", __func__); 37351da177e4SLinus Torvalds return -EISDIR; 37361da177e4SLinus Torvalds } 37371da177e4SLinus Torvalds parent_hub = hdev_to_hub(parent_hdev); 37381da177e4SLinus Torvalds 37391da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 37401da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 37411da177e4SLinus Torvalds 37421da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 37431da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 3744fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 37451da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 3746dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 37471da177e4SLinus Torvalds break; 37481da177e4SLinus Torvalds } 37491da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 3750d5cbad4bSAlan Stern 37511da177e4SLinus Torvalds if (ret < 0) 37521da177e4SLinus Torvalds goto re_enumerate; 37531da177e4SLinus Torvalds 37541da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 3755eb764c4bSAlan Stern if (descriptors_changed(udev, &descriptor)) { 37561da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 37571da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 37581da177e4SLinus Torvalds goto re_enumerate; 37591da177e4SLinus Torvalds } 37601da177e4SLinus Torvalds 37614fe0387aSAlan Stern /* Restore the device's previous configuration */ 37621da177e4SLinus Torvalds if (!udev->actconfig) 37631da177e4SLinus Torvalds goto done; 37643f0479e0SSarah Sharp 3765d673bfcbSSarah Sharp mutex_lock(hcd->bandwidth_mutex); 37663f0479e0SSarah Sharp ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); 37673f0479e0SSarah Sharp if (ret < 0) { 37683f0479e0SSarah Sharp dev_warn(&udev->dev, 37693f0479e0SSarah Sharp "Busted HC? Not enough HCD resources for " 37703f0479e0SSarah Sharp "old configuration.\n"); 3771d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 37723f0479e0SSarah Sharp goto re_enumerate; 37733f0479e0SSarah Sharp } 37741da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 37751da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 37761da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 37771da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 37781da177e4SLinus Torvalds if (ret < 0) { 37791da177e4SLinus Torvalds dev_err(&udev->dev, 37801da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 37811da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 3782d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 37831da177e4SLinus Torvalds goto re_enumerate; 37841da177e4SLinus Torvalds } 3785d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 37861da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 37871da177e4SLinus Torvalds 37884fe0387aSAlan Stern /* Put interfaces back into the same altsettings as before. 37894fe0387aSAlan Stern * Don't bother to send the Set-Interface request for interfaces 37904fe0387aSAlan Stern * that were already in altsetting 0; besides being unnecessary, 37914fe0387aSAlan Stern * many devices can't handle it. Instead just reset the host-side 37924fe0387aSAlan Stern * endpoint state. 37934fe0387aSAlan Stern */ 37941da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 37953f0479e0SSarah Sharp struct usb_host_config *config = udev->actconfig; 37963f0479e0SSarah Sharp struct usb_interface *intf = config->interface[i]; 37971da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 37981da177e4SLinus Torvalds 37991da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 38004fe0387aSAlan Stern if (desc->bAlternateSetting == 0) { 38014fe0387aSAlan Stern usb_disable_interface(udev, intf, true); 38024fe0387aSAlan Stern usb_enable_interface(udev, intf, true); 38034fe0387aSAlan Stern ret = 0; 38044fe0387aSAlan Stern } else { 380504a723eaSSarah Sharp /* Let the bandwidth allocation function know that this 380604a723eaSSarah Sharp * device has been reset, and it will have to use 380704a723eaSSarah Sharp * alternate setting 0 as the current alternate setting. 38083f0479e0SSarah Sharp */ 380904a723eaSSarah Sharp intf->resetting_device = 1; 38101da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 38111da177e4SLinus Torvalds desc->bAlternateSetting); 381204a723eaSSarah Sharp intf->resetting_device = 0; 38134fe0387aSAlan Stern } 38141da177e4SLinus Torvalds if (ret < 0) { 38151da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 38161da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 38171da177e4SLinus Torvalds desc->bInterfaceNumber, 38181da177e4SLinus Torvalds desc->bAlternateSetting, 38191da177e4SLinus Torvalds ret); 38201da177e4SLinus Torvalds goto re_enumerate; 38211da177e4SLinus Torvalds } 38221da177e4SLinus Torvalds } 38231da177e4SLinus Torvalds 38241da177e4SLinus Torvalds done: 38251da177e4SLinus Torvalds return 0; 38261da177e4SLinus Torvalds 38271da177e4SLinus Torvalds re_enumerate: 38281da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 38291da177e4SLinus Torvalds return -ENODEV; 38301da177e4SLinus Torvalds } 383179efa097SAlan Stern 383279efa097SAlan Stern /** 3833742120c6SMing Lei * usb_reset_device - warn interface drivers and perform a USB port reset 383479efa097SAlan Stern * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 383579efa097SAlan Stern * 383679efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 383779efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 383879efa097SAlan Stern * the reset is over (using their post_reset method). 383979efa097SAlan Stern * 3840742120c6SMing Lei * Return value is the same as for usb_reset_and_verify_device(). 384179efa097SAlan Stern * 384279efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 384379efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 384479efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 384579efa097SAlan Stern * the device using usb_lock_device_for_reset(). 384678d9a487SAlan Stern * 384778d9a487SAlan Stern * If an interface is currently being probed or disconnected, we assume 384878d9a487SAlan Stern * its driver knows how to handle resets. For all other interfaces, 384978d9a487SAlan Stern * if the driver doesn't have pre_reset and post_reset methods then 385078d9a487SAlan Stern * we attempt to unbind it and rebind afterward. 385179efa097SAlan Stern */ 3852742120c6SMing Lei int usb_reset_device(struct usb_device *udev) 385379efa097SAlan Stern { 385479efa097SAlan Stern int ret; 3855852c4b43SAlan Stern int i; 385679efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 385779efa097SAlan Stern 385879efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 385979efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 386079efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 386179efa097SAlan Stern udev->state); 386279efa097SAlan Stern return -EINVAL; 386379efa097SAlan Stern } 386479efa097SAlan Stern 3865645daaabSAlan Stern /* Prevent autosuspend during the reset */ 386694fcda1fSAlan Stern usb_autoresume_device(udev); 3867645daaabSAlan Stern 386879efa097SAlan Stern if (config) { 3869852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 3870852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 387179efa097SAlan Stern struct usb_driver *drv; 387278d9a487SAlan Stern int unbind = 0; 387379efa097SAlan Stern 3874852c4b43SAlan Stern if (cintf->dev.driver) { 387579efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 387678d9a487SAlan Stern if (drv->pre_reset && drv->post_reset) 387778d9a487SAlan Stern unbind = (drv->pre_reset)(cintf); 387878d9a487SAlan Stern else if (cintf->condition == 387978d9a487SAlan Stern USB_INTERFACE_BOUND) 388078d9a487SAlan Stern unbind = 1; 388178d9a487SAlan Stern if (unbind) 388278d9a487SAlan Stern usb_forced_unbind_intf(cintf); 388379efa097SAlan Stern } 388479efa097SAlan Stern } 388579efa097SAlan Stern } 388679efa097SAlan Stern 3887742120c6SMing Lei ret = usb_reset_and_verify_device(udev); 388879efa097SAlan Stern 388979efa097SAlan Stern if (config) { 3890852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 3891852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 389279efa097SAlan Stern struct usb_driver *drv; 389378d9a487SAlan Stern int rebind = cintf->needs_binding; 389479efa097SAlan Stern 389578d9a487SAlan Stern if (!rebind && cintf->dev.driver) { 389679efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 389779efa097SAlan Stern if (drv->post_reset) 389878d9a487SAlan Stern rebind = (drv->post_reset)(cintf); 389978d9a487SAlan Stern else if (cintf->condition == 390078d9a487SAlan Stern USB_INTERFACE_BOUND) 390178d9a487SAlan Stern rebind = 1; 390279efa097SAlan Stern } 39036c640945SAlan Stern if (ret == 0 && rebind) 390478d9a487SAlan Stern usb_rebind_intf(cintf); 390579efa097SAlan Stern } 390679efa097SAlan Stern } 390779efa097SAlan Stern 390894fcda1fSAlan Stern usb_autosuspend_device(udev); 390979efa097SAlan Stern return ret; 391079efa097SAlan Stern } 3911742120c6SMing Lei EXPORT_SYMBOL_GPL(usb_reset_device); 3912dc023dceSInaky Perez-Gonzalez 3913dc023dceSInaky Perez-Gonzalez 3914dc023dceSInaky Perez-Gonzalez /** 3915dc023dceSInaky Perez-Gonzalez * usb_queue_reset_device - Reset a USB device from an atomic context 3916dc023dceSInaky Perez-Gonzalez * @iface: USB interface belonging to the device to reset 3917dc023dceSInaky Perez-Gonzalez * 3918dc023dceSInaky Perez-Gonzalez * This function can be used to reset a USB device from an atomic 3919dc023dceSInaky Perez-Gonzalez * context, where usb_reset_device() won't work (as it blocks). 3920dc023dceSInaky Perez-Gonzalez * 3921dc023dceSInaky Perez-Gonzalez * Doing a reset via this method is functionally equivalent to calling 3922dc023dceSInaky Perez-Gonzalez * usb_reset_device(), except for the fact that it is delayed to a 3923dc023dceSInaky Perez-Gonzalez * workqueue. This means that any drivers bound to other interfaces 3924dc023dceSInaky Perez-Gonzalez * might be unbound, as well as users from usbfs in user space. 3925dc023dceSInaky Perez-Gonzalez * 3926dc023dceSInaky Perez-Gonzalez * Corner cases: 3927dc023dceSInaky Perez-Gonzalez * 3928dc023dceSInaky Perez-Gonzalez * - Scheduling two resets at the same time from two different drivers 3929dc023dceSInaky Perez-Gonzalez * attached to two different interfaces of the same device is 3930dc023dceSInaky Perez-Gonzalez * possible; depending on how the driver attached to each interface 3931dc023dceSInaky Perez-Gonzalez * handles ->pre_reset(), the second reset might happen or not. 3932dc023dceSInaky Perez-Gonzalez * 3933dc023dceSInaky Perez-Gonzalez * - If a driver is unbound and it had a pending reset, the reset will 3934dc023dceSInaky Perez-Gonzalez * be cancelled. 3935dc023dceSInaky Perez-Gonzalez * 3936dc023dceSInaky Perez-Gonzalez * - This function can be called during .probe() or .disconnect() 3937dc023dceSInaky Perez-Gonzalez * times. On return from .disconnect(), any pending resets will be 3938dc023dceSInaky Perez-Gonzalez * cancelled. 3939dc023dceSInaky Perez-Gonzalez * 3940dc023dceSInaky Perez-Gonzalez * There is no no need to lock/unlock the @reset_ws as schedule_work() 3941dc023dceSInaky Perez-Gonzalez * does its own. 3942dc023dceSInaky Perez-Gonzalez * 3943dc023dceSInaky Perez-Gonzalez * NOTE: We don't do any reference count tracking because it is not 3944dc023dceSInaky Perez-Gonzalez * needed. The lifecycle of the work_struct is tied to the 3945dc023dceSInaky Perez-Gonzalez * usb_interface. Before destroying the interface we cancel the 3946dc023dceSInaky Perez-Gonzalez * work_struct, so the fact that work_struct is queued and or 3947dc023dceSInaky Perez-Gonzalez * running means the interface (and thus, the device) exist and 3948dc023dceSInaky Perez-Gonzalez * are referenced. 3949dc023dceSInaky Perez-Gonzalez */ 3950dc023dceSInaky Perez-Gonzalez void usb_queue_reset_device(struct usb_interface *iface) 3951dc023dceSInaky Perez-Gonzalez { 3952dc023dceSInaky Perez-Gonzalez schedule_work(&iface->reset_ws); 3953dc023dceSInaky Perez-Gonzalez } 3954dc023dceSInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_queue_reset_device); 3955