hub.c 92 KB

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  1. /*
  2. * USB hub driver.
  3. *
  4. * (C) Copyright 1999 Linus Torvalds
  5. * (C) Copyright 1999 Johannes Erdfelt
  6. * (C) Copyright 1999 Gregory P. Smith
  7. * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
  8. *
  9. */
  10. #include <linux/kernel.h>
  11. #include <linux/errno.h>
  12. #include <linux/module.h>
  13. #include <linux/moduleparam.h>
  14. #include <linux/completion.h>
  15. #include <linux/sched.h>
  16. #include <linux/list.h>
  17. #include <linux/slab.h>
  18. #include <linux/ioctl.h>
  19. #include <linux/usb.h>
  20. #include <linux/usbdevice_fs.h>
  21. #include <linux/kthread.h>
  22. #include <linux/mutex.h>
  23. #include <linux/freezer.h>
  24. #include <asm/uaccess.h>
  25. #include <asm/byteorder.h>
  26. #include "usb.h"
  27. #include "hcd.h"
  28. #include "hub.h"
  29. /* if we are in debug mode, always announce new devices */
  30. #ifdef DEBUG
  31. #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES
  32. #define CONFIG_USB_ANNOUNCE_NEW_DEVICES
  33. #endif
  34. #endif
  35. struct usb_hub {
  36. struct device *intfdev; /* the "interface" device */
  37. struct usb_device *hdev;
  38. struct kref kref;
  39. struct urb *urb; /* for interrupt polling pipe */
  40. /* buffer for urb ... with extra space in case of babble */
  41. char (*buffer)[8];
  42. dma_addr_t buffer_dma; /* DMA address for buffer */
  43. union {
  44. struct usb_hub_status hub;
  45. struct usb_port_status port;
  46. } *status; /* buffer for status reports */
  47. struct mutex status_mutex; /* for the status buffer */
  48. int error; /* last reported error */
  49. int nerrors; /* track consecutive errors */
  50. struct list_head event_list; /* hubs w/data or errs ready */
  51. unsigned long event_bits[1]; /* status change bitmask */
  52. unsigned long change_bits[1]; /* ports with logical connect
  53. status change */
  54. unsigned long busy_bits[1]; /* ports being reset or
  55. resumed */
  56. #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
  57. #error event_bits[] is too short!
  58. #endif
  59. struct usb_hub_descriptor *descriptor; /* class descriptor */
  60. struct usb_tt tt; /* Transaction Translator */
  61. unsigned mA_per_port; /* current for each child */
  62. unsigned limited_power:1;
  63. unsigned quiescing:1;
  64. unsigned activating:1;
  65. unsigned disconnected:1;
  66. unsigned has_indicators:1;
  67. u8 indicator[USB_MAXCHILDREN];
  68. struct delayed_work leds;
  69. };
  70. /* Protect struct usb_device->state and ->children members
  71. * Note: Both are also protected by ->dev.sem, except that ->state can
  72. * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
  73. static DEFINE_SPINLOCK(device_state_lock);
  74. /* khubd's worklist and its lock */
  75. static DEFINE_SPINLOCK(hub_event_lock);
  76. static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
  77. /* Wakes up khubd */
  78. static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
  79. static struct task_struct *khubd_task;
  80. /* cycle leds on hubs that aren't blinking for attention */
  81. static int blinkenlights = 0;
  82. module_param (blinkenlights, bool, S_IRUGO);
  83. MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
  84. /*
  85. * As of 2.6.10 we introduce a new USB device initialization scheme which
  86. * closely resembles the way Windows works. Hopefully it will be compatible
  87. * with a wider range of devices than the old scheme. However some previously
  88. * working devices may start giving rise to "device not accepting address"
  89. * errors; if that happens the user can try the old scheme by adjusting the
  90. * following module parameters.
  91. *
  92. * For maximum flexibility there are two boolean parameters to control the
  93. * hub driver's behavior. On the first initialization attempt, if the
  94. * "old_scheme_first" parameter is set then the old scheme will be used,
  95. * otherwise the new scheme is used. If that fails and "use_both_schemes"
  96. * is set, then the driver will make another attempt, using the other scheme.
  97. */
  98. static int old_scheme_first = 0;
  99. module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
  100. MODULE_PARM_DESC(old_scheme_first,
  101. "start with the old device initialization scheme");
  102. static int use_both_schemes = 1;
  103. module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
  104. MODULE_PARM_DESC(use_both_schemes,
  105. "try the other device initialization scheme if the "
  106. "first one fails");
  107. /* Mutual exclusion for EHCI CF initialization. This interferes with
  108. * port reset on some companion controllers.
  109. */
  110. DECLARE_RWSEM(ehci_cf_port_reset_rwsem);
  111. EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem);
  112. static inline char *portspeed(int portstatus)
  113. {
  114. if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
  115. return "480 Mb/s";
  116. else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
  117. return "1.5 Mb/s";
  118. else
  119. return "12 Mb/s";
  120. }
  121. /* Note that hdev or one of its children must be locked! */
  122. static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
  123. {
  124. return usb_get_intfdata(hdev->actconfig->interface[0]);
  125. }
  126. /* USB 2.0 spec Section 11.24.4.5 */
  127. static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
  128. {
  129. int i, ret;
  130. for (i = 0; i < 3; i++) {
  131. ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
  132. USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
  133. USB_DT_HUB << 8, 0, data, size,
  134. USB_CTRL_GET_TIMEOUT);
  135. if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
  136. return ret;
  137. }
  138. return -EINVAL;
  139. }
  140. /*
  141. * USB 2.0 spec Section 11.24.2.1
  142. */
  143. static int clear_hub_feature(struct usb_device *hdev, int feature)
  144. {
  145. return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
  146. USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
  147. }
  148. /*
  149. * USB 2.0 spec Section 11.24.2.2
  150. */
  151. static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
  152. {
  153. return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
  154. USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
  155. NULL, 0, 1000);
  156. }
  157. /*
  158. * USB 2.0 spec Section 11.24.2.13
  159. */
  160. static int set_port_feature(struct usb_device *hdev, int port1, int feature)
  161. {
  162. return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
  163. USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
  164. NULL, 0, 1000);
  165. }
  166. /*
  167. * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
  168. * for info about using port indicators
  169. */
  170. static void set_port_led(
  171. struct usb_hub *hub,
  172. int port1,
  173. int selector
  174. )
  175. {
  176. int status = set_port_feature(hub->hdev, (selector << 8) | port1,
  177. USB_PORT_FEAT_INDICATOR);
  178. if (status < 0)
  179. dev_dbg (hub->intfdev,
  180. "port %d indicator %s status %d\n",
  181. port1,
  182. ({ char *s; switch (selector) {
  183. case HUB_LED_AMBER: s = "amber"; break;
  184. case HUB_LED_GREEN: s = "green"; break;
  185. case HUB_LED_OFF: s = "off"; break;
  186. case HUB_LED_AUTO: s = "auto"; break;
  187. default: s = "??"; break;
  188. }; s; }),
  189. status);
  190. }
  191. #define LED_CYCLE_PERIOD ((2*HZ)/3)
  192. static void led_work (struct work_struct *work)
  193. {
  194. struct usb_hub *hub =
  195. container_of(work, struct usb_hub, leds.work);
  196. struct usb_device *hdev = hub->hdev;
  197. unsigned i;
  198. unsigned changed = 0;
  199. int cursor = -1;
  200. if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
  201. return;
  202. for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
  203. unsigned selector, mode;
  204. /* 30%-50% duty cycle */
  205. switch (hub->indicator[i]) {
  206. /* cycle marker */
  207. case INDICATOR_CYCLE:
  208. cursor = i;
  209. selector = HUB_LED_AUTO;
  210. mode = INDICATOR_AUTO;
  211. break;
  212. /* blinking green = sw attention */
  213. case INDICATOR_GREEN_BLINK:
  214. selector = HUB_LED_GREEN;
  215. mode = INDICATOR_GREEN_BLINK_OFF;
  216. break;
  217. case INDICATOR_GREEN_BLINK_OFF:
  218. selector = HUB_LED_OFF;
  219. mode = INDICATOR_GREEN_BLINK;
  220. break;
  221. /* blinking amber = hw attention */
  222. case INDICATOR_AMBER_BLINK:
  223. selector = HUB_LED_AMBER;
  224. mode = INDICATOR_AMBER_BLINK_OFF;
  225. break;
  226. case INDICATOR_AMBER_BLINK_OFF:
  227. selector = HUB_LED_OFF;
  228. mode = INDICATOR_AMBER_BLINK;
  229. break;
  230. /* blink green/amber = reserved */
  231. case INDICATOR_ALT_BLINK:
  232. selector = HUB_LED_GREEN;
  233. mode = INDICATOR_ALT_BLINK_OFF;
  234. break;
  235. case INDICATOR_ALT_BLINK_OFF:
  236. selector = HUB_LED_AMBER;
  237. mode = INDICATOR_ALT_BLINK;
  238. break;
  239. default:
  240. continue;
  241. }
  242. if (selector != HUB_LED_AUTO)
  243. changed = 1;
  244. set_port_led(hub, i + 1, selector);
  245. hub->indicator[i] = mode;
  246. }
  247. if (!changed && blinkenlights) {
  248. cursor++;
  249. cursor %= hub->descriptor->bNbrPorts;
  250. set_port_led(hub, cursor + 1, HUB_LED_GREEN);
  251. hub->indicator[cursor] = INDICATOR_CYCLE;
  252. changed++;
  253. }
  254. if (changed)
  255. schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
  256. }
  257. /* use a short timeout for hub/port status fetches */
  258. #define USB_STS_TIMEOUT 1000
  259. #define USB_STS_RETRIES 5
  260. /*
  261. * USB 2.0 spec Section 11.24.2.6
  262. */
  263. static int get_hub_status(struct usb_device *hdev,
  264. struct usb_hub_status *data)
  265. {
  266. int i, status = -ETIMEDOUT;
  267. for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
  268. status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
  269. USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
  270. data, sizeof(*data), USB_STS_TIMEOUT);
  271. }
  272. return status;
  273. }
  274. /*
  275. * USB 2.0 spec Section 11.24.2.7
  276. */
  277. static int get_port_status(struct usb_device *hdev, int port1,
  278. struct usb_port_status *data)
  279. {
  280. int i, status = -ETIMEDOUT;
  281. for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
  282. status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
  283. USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
  284. data, sizeof(*data), USB_STS_TIMEOUT);
  285. }
  286. return status;
  287. }
  288. static int hub_port_status(struct usb_hub *hub, int port1,
  289. u16 *status, u16 *change)
  290. {
  291. int ret;
  292. mutex_lock(&hub->status_mutex);
  293. ret = get_port_status(hub->hdev, port1, &hub->status->port);
  294. if (ret < 4) {
  295. dev_err(hub->intfdev,
  296. "%s failed (err = %d)\n", __func__, ret);
  297. if (ret >= 0)
  298. ret = -EIO;
  299. } else {
  300. *status = le16_to_cpu(hub->status->port.wPortStatus);
  301. *change = le16_to_cpu(hub->status->port.wPortChange);
  302. ret = 0;
  303. }
  304. mutex_unlock(&hub->status_mutex);
  305. return ret;
  306. }
  307. static void kick_khubd(struct usb_hub *hub)
  308. {
  309. unsigned long flags;
  310. /* Suppress autosuspend until khubd runs */
  311. to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
  312. spin_lock_irqsave(&hub_event_lock, flags);
  313. if (!hub->disconnected && list_empty(&hub->event_list)) {
  314. list_add_tail(&hub->event_list, &hub_event_list);
  315. wake_up(&khubd_wait);
  316. }
  317. spin_unlock_irqrestore(&hub_event_lock, flags);
  318. }
  319. void usb_kick_khubd(struct usb_device *hdev)
  320. {
  321. /* FIXME: What if hdev isn't bound to the hub driver? */
  322. kick_khubd(hdev_to_hub(hdev));
  323. }
  324. /* completion function, fires on port status changes and various faults */
  325. static void hub_irq(struct urb *urb)
  326. {
  327. struct usb_hub *hub = urb->context;
  328. int status = urb->status;
  329. int i;
  330. unsigned long bits;
  331. switch (status) {
  332. case -ENOENT: /* synchronous unlink */
  333. case -ECONNRESET: /* async unlink */
  334. case -ESHUTDOWN: /* hardware going away */
  335. return;
  336. default: /* presumably an error */
  337. /* Cause a hub reset after 10 consecutive errors */
  338. dev_dbg (hub->intfdev, "transfer --> %d\n", status);
  339. if ((++hub->nerrors < 10) || hub->error)
  340. goto resubmit;
  341. hub->error = status;
  342. /* FALL THROUGH */
  343. /* let khubd handle things */
  344. case 0: /* we got data: port status changed */
  345. bits = 0;
  346. for (i = 0; i < urb->actual_length; ++i)
  347. bits |= ((unsigned long) ((*hub->buffer)[i]))
  348. << (i*8);
  349. hub->event_bits[0] = bits;
  350. break;
  351. }
  352. hub->nerrors = 0;
  353. /* Something happened, let khubd figure it out */
  354. kick_khubd(hub);
  355. resubmit:
  356. if (hub->quiescing)
  357. return;
  358. if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
  359. && status != -ENODEV && status != -EPERM)
  360. dev_err (hub->intfdev, "resubmit --> %d\n", status);
  361. }
  362. /* USB 2.0 spec Section 11.24.2.3 */
  363. static inline int
  364. hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
  365. {
  366. return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
  367. HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
  368. tt, NULL, 0, 1000);
  369. }
  370. /*
  371. * enumeration blocks khubd for a long time. we use keventd instead, since
  372. * long blocking there is the exception, not the rule. accordingly, HCDs
  373. * talking to TTs must queue control transfers (not just bulk and iso), so
  374. * both can talk to the same hub concurrently.
  375. */
  376. static void hub_tt_kevent (struct work_struct *work)
  377. {
  378. struct usb_hub *hub =
  379. container_of(work, struct usb_hub, tt.kevent);
  380. unsigned long flags;
  381. int limit = 100;
  382. spin_lock_irqsave (&hub->tt.lock, flags);
  383. while (--limit && !list_empty (&hub->tt.clear_list)) {
  384. struct list_head *temp;
  385. struct usb_tt_clear *clear;
  386. struct usb_device *hdev = hub->hdev;
  387. int status;
  388. temp = hub->tt.clear_list.next;
  389. clear = list_entry (temp, struct usb_tt_clear, clear_list);
  390. list_del (&clear->clear_list);
  391. /* drop lock so HCD can concurrently report other TT errors */
  392. spin_unlock_irqrestore (&hub->tt.lock, flags);
  393. status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
  394. spin_lock_irqsave (&hub->tt.lock, flags);
  395. if (status)
  396. dev_err (&hdev->dev,
  397. "clear tt %d (%04x) error %d\n",
  398. clear->tt, clear->devinfo, status);
  399. kfree(clear);
  400. }
  401. spin_unlock_irqrestore (&hub->tt.lock, flags);
  402. }
  403. /**
  404. * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
  405. * @udev: the device whose split transaction failed
  406. * @pipe: identifies the endpoint of the failed transaction
  407. *
  408. * High speed HCDs use this to tell the hub driver that some split control or
  409. * bulk transaction failed in a way that requires clearing internal state of
  410. * a transaction translator. This is normally detected (and reported) from
  411. * interrupt context.
  412. *
  413. * It may not be possible for that hub to handle additional full (or low)
  414. * speed transactions until that state is fully cleared out.
  415. */
  416. void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
  417. {
  418. struct usb_tt *tt = udev->tt;
  419. unsigned long flags;
  420. struct usb_tt_clear *clear;
  421. /* we've got to cope with an arbitrary number of pending TT clears,
  422. * since each TT has "at least two" buffers that can need it (and
  423. * there can be many TTs per hub). even if they're uncommon.
  424. */
  425. if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
  426. dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
  427. /* FIXME recover somehow ... RESET_TT? */
  428. return;
  429. }
  430. /* info that CLEAR_TT_BUFFER needs */
  431. clear->tt = tt->multi ? udev->ttport : 1;
  432. clear->devinfo = usb_pipeendpoint (pipe);
  433. clear->devinfo |= udev->devnum << 4;
  434. clear->devinfo |= usb_pipecontrol (pipe)
  435. ? (USB_ENDPOINT_XFER_CONTROL << 11)
  436. : (USB_ENDPOINT_XFER_BULK << 11);
  437. if (usb_pipein (pipe))
  438. clear->devinfo |= 1 << 15;
  439. /* tell keventd to clear state for this TT */
  440. spin_lock_irqsave (&tt->lock, flags);
  441. list_add_tail (&clear->clear_list, &tt->clear_list);
  442. schedule_work (&tt->kevent);
  443. spin_unlock_irqrestore (&tt->lock, flags);
  444. }
  445. EXPORT_SYMBOL_GPL(usb_hub_tt_clear_buffer);
  446. static void hub_power_on(struct usb_hub *hub)
  447. {
  448. int port1;
  449. unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
  450. u16 wHubCharacteristics =
  451. le16_to_cpu(hub->descriptor->wHubCharacteristics);
  452. /* Enable power on each port. Some hubs have reserved values
  453. * of LPSM (> 2) in their descriptors, even though they are
  454. * USB 2.0 hubs. Some hubs do not implement port-power switching
  455. * but only emulate it. In all cases, the ports won't work
  456. * unless we send these messages to the hub.
  457. */
  458. if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
  459. dev_dbg(hub->intfdev, "enabling power on all ports\n");
  460. else
  461. dev_dbg(hub->intfdev, "trying to enable port power on "
  462. "non-switchable hub\n");
  463. for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
  464. set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
  465. /* Wait at least 100 msec for power to become stable */
  466. msleep(max(pgood_delay, (unsigned) 100));
  467. }
  468. static void hub_quiesce(struct usb_hub *hub)
  469. {
  470. /* (nonblocking) khubd and related activity won't re-trigger */
  471. hub->quiescing = 1;
  472. hub->activating = 0;
  473. /* (blocking) stop khubd and related activity */
  474. usb_kill_urb(hub->urb);
  475. if (hub->has_indicators)
  476. cancel_delayed_work_sync(&hub->leds);
  477. if (hub->tt.hub)
  478. cancel_work_sync(&hub->tt.kevent);
  479. }
  480. static void hub_activate(struct usb_hub *hub)
  481. {
  482. int status;
  483. hub->quiescing = 0;
  484. hub->activating = 1;
  485. status = usb_submit_urb(hub->urb, GFP_NOIO);
  486. if (status < 0)
  487. dev_err(hub->intfdev, "activate --> %d\n", status);
  488. if (hub->has_indicators && blinkenlights)
  489. schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
  490. /* scan all ports ASAP */
  491. kick_khubd(hub);
  492. }
  493. static int hub_hub_status(struct usb_hub *hub,
  494. u16 *status, u16 *change)
  495. {
  496. int ret;
  497. mutex_lock(&hub->status_mutex);
  498. ret = get_hub_status(hub->hdev, &hub->status->hub);
  499. if (ret < 0)
  500. dev_err (hub->intfdev,
  501. "%s failed (err = %d)\n", __func__, ret);
  502. else {
  503. *status = le16_to_cpu(hub->status->hub.wHubStatus);
  504. *change = le16_to_cpu(hub->status->hub.wHubChange);
  505. ret = 0;
  506. }
  507. mutex_unlock(&hub->status_mutex);
  508. return ret;
  509. }
  510. static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
  511. {
  512. struct usb_device *hdev = hub->hdev;
  513. int ret = 0;
  514. if (hdev->children[port1-1] && set_state)
  515. usb_set_device_state(hdev->children[port1-1],
  516. USB_STATE_NOTATTACHED);
  517. if (!hub->error)
  518. ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
  519. if (ret)
  520. dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
  521. port1, ret);
  522. return ret;
  523. }
  524. /*
  525. * Disable a port and mark a logical connnect-change event, so that some
  526. * time later khubd will disconnect() any existing usb_device on the port
  527. * and will re-enumerate if there actually is a device attached.
  528. */
  529. static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
  530. {
  531. dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
  532. hub_port_disable(hub, port1, 1);
  533. /* FIXME let caller ask to power down the port:
  534. * - some devices won't enumerate without a VBUS power cycle
  535. * - SRP saves power that way
  536. * - ... new call, TBD ...
  537. * That's easy if this hub can switch power per-port, and
  538. * khubd reactivates the port later (timer, SRP, etc).
  539. * Powerdown must be optional, because of reset/DFU.
  540. */
  541. set_bit(port1, hub->change_bits);
  542. kick_khubd(hub);
  543. }
  544. /* caller has locked the hub device */
  545. static void hub_stop(struct usb_hub *hub)
  546. {
  547. struct usb_device *hdev = hub->hdev;
  548. int i;
  549. /* Disconnect all the children */
  550. for (i = 0; i < hdev->maxchild; ++i) {
  551. if (hdev->children[i])
  552. usb_disconnect(&hdev->children[i]);
  553. }
  554. hub_quiesce(hub);
  555. }
  556. #define HUB_RESET 1
  557. #define HUB_RESUME 2
  558. #define HUB_RESET_RESUME 3
  559. #ifdef CONFIG_PM
  560. static void hub_restart(struct usb_hub *hub, int type)
  561. {
  562. struct usb_device *hdev = hub->hdev;
  563. int port1;
  564. /* Check each of the children to see if they require
  565. * USB-PERSIST handling or disconnection. Also check
  566. * each unoccupied port to make sure it is still disabled.
  567. */
  568. for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
  569. struct usb_device *udev = hdev->children[port1-1];
  570. int status = 0;
  571. u16 portstatus, portchange;
  572. if (!udev || udev->state == USB_STATE_NOTATTACHED) {
  573. if (type != HUB_RESET) {
  574. status = hub_port_status(hub, port1,
  575. &portstatus, &portchange);
  576. if (status == 0 && (portstatus &
  577. USB_PORT_STAT_ENABLE))
  578. clear_port_feature(hdev, port1,
  579. USB_PORT_FEAT_ENABLE);
  580. }
  581. continue;
  582. }
  583. /* Was the power session lost while we were suspended? */
  584. switch (type) {
  585. case HUB_RESET_RESUME:
  586. portstatus = 0;
  587. portchange = USB_PORT_STAT_C_CONNECTION;
  588. break;
  589. case HUB_RESET:
  590. case HUB_RESUME:
  591. status = hub_port_status(hub, port1,
  592. &portstatus, &portchange);
  593. break;
  594. }
  595. /* For "USB_PERSIST"-enabled children we must
  596. * mark the child device for reset-resume and
  597. * turn off the various status changes to prevent
  598. * khubd from disconnecting it later.
  599. */
  600. if (udev->persist_enabled && status == 0 &&
  601. !(portstatus & USB_PORT_STAT_ENABLE)) {
  602. if (portchange & USB_PORT_STAT_C_ENABLE)
  603. clear_port_feature(hub->hdev, port1,
  604. USB_PORT_FEAT_C_ENABLE);
  605. if (portchange & USB_PORT_STAT_C_CONNECTION)
  606. clear_port_feature(hub->hdev, port1,
  607. USB_PORT_FEAT_C_CONNECTION);
  608. udev->reset_resume = 1;
  609. }
  610. /* Otherwise for a reset_resume we must disconnect the child,
  611. * but as we may not lock the child device here
  612. * we have to do a "logical" disconnect.
  613. */
  614. else if (type == HUB_RESET_RESUME)
  615. hub_port_logical_disconnect(hub, port1);
  616. }
  617. hub_activate(hub);
  618. }
  619. #endif /* CONFIG_PM */
  620. /* caller has locked the hub device */
  621. static int hub_pre_reset(struct usb_interface *intf)
  622. {
  623. struct usb_hub *hub = usb_get_intfdata(intf);
  624. hub_stop(hub);
  625. return 0;
  626. }
  627. /* caller has locked the hub device */
  628. static int hub_post_reset(struct usb_interface *intf)
  629. {
  630. struct usb_hub *hub = usb_get_intfdata(intf);
  631. hub_power_on(hub);
  632. hub_activate(hub);
  633. return 0;
  634. }
  635. static int hub_configure(struct usb_hub *hub,
  636. struct usb_endpoint_descriptor *endpoint)
  637. {
  638. struct usb_device *hdev = hub->hdev;
  639. struct device *hub_dev = hub->intfdev;
  640. u16 hubstatus, hubchange;
  641. u16 wHubCharacteristics;
  642. unsigned int pipe;
  643. int maxp, ret;
  644. char *message;
  645. hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
  646. &hub->buffer_dma);
  647. if (!hub->buffer) {
  648. message = "can't allocate hub irq buffer";
  649. ret = -ENOMEM;
  650. goto fail;
  651. }
  652. hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
  653. if (!hub->status) {
  654. message = "can't kmalloc hub status buffer";
  655. ret = -ENOMEM;
  656. goto fail;
  657. }
  658. mutex_init(&hub->status_mutex);
  659. hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
  660. if (!hub->descriptor) {
  661. message = "can't kmalloc hub descriptor";
  662. ret = -ENOMEM;
  663. goto fail;
  664. }
  665. /* Request the entire hub descriptor.
  666. * hub->descriptor can handle USB_MAXCHILDREN ports,
  667. * but the hub can/will return fewer bytes here.
  668. */
  669. ret = get_hub_descriptor(hdev, hub->descriptor,
  670. sizeof(*hub->descriptor));
  671. if (ret < 0) {
  672. message = "can't read hub descriptor";
  673. goto fail;
  674. } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
  675. message = "hub has too many ports!";
  676. ret = -ENODEV;
  677. goto fail;
  678. }
  679. hdev->maxchild = hub->descriptor->bNbrPorts;
  680. dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
  681. (hdev->maxchild == 1) ? "" : "s");
  682. wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
  683. if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
  684. int i;
  685. char portstr [USB_MAXCHILDREN + 1];
  686. for (i = 0; i < hdev->maxchild; i++)
  687. portstr[i] = hub->descriptor->DeviceRemovable
  688. [((i + 1) / 8)] & (1 << ((i + 1) % 8))
  689. ? 'F' : 'R';
  690. portstr[hdev->maxchild] = 0;
  691. dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
  692. } else
  693. dev_dbg(hub_dev, "standalone hub\n");
  694. switch (wHubCharacteristics & HUB_CHAR_LPSM) {
  695. case 0x00:
  696. dev_dbg(hub_dev, "ganged power switching\n");
  697. break;
  698. case 0x01:
  699. dev_dbg(hub_dev, "individual port power switching\n");
  700. break;
  701. case 0x02:
  702. case 0x03:
  703. dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
  704. break;
  705. }
  706. switch (wHubCharacteristics & HUB_CHAR_OCPM) {
  707. case 0x00:
  708. dev_dbg(hub_dev, "global over-current protection\n");
  709. break;
  710. case 0x08:
  711. dev_dbg(hub_dev, "individual port over-current protection\n");
  712. break;
  713. case 0x10:
  714. case 0x18:
  715. dev_dbg(hub_dev, "no over-current protection\n");
  716. break;
  717. }
  718. spin_lock_init (&hub->tt.lock);
  719. INIT_LIST_HEAD (&hub->tt.clear_list);
  720. INIT_WORK (&hub->tt.kevent, hub_tt_kevent);
  721. switch (hdev->descriptor.bDeviceProtocol) {
  722. case 0:
  723. break;
  724. case 1:
  725. dev_dbg(hub_dev, "Single TT\n");
  726. hub->tt.hub = hdev;
  727. break;
  728. case 2:
  729. ret = usb_set_interface(hdev, 0, 1);
  730. if (ret == 0) {
  731. dev_dbg(hub_dev, "TT per port\n");
  732. hub->tt.multi = 1;
  733. } else
  734. dev_err(hub_dev, "Using single TT (err %d)\n",
  735. ret);
  736. hub->tt.hub = hdev;
  737. break;
  738. default:
  739. dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
  740. hdev->descriptor.bDeviceProtocol);
  741. break;
  742. }
  743. /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
  744. switch (wHubCharacteristics & HUB_CHAR_TTTT) {
  745. case HUB_TTTT_8_BITS:
  746. if (hdev->descriptor.bDeviceProtocol != 0) {
  747. hub->tt.think_time = 666;
  748. dev_dbg(hub_dev, "TT requires at most %d "
  749. "FS bit times (%d ns)\n",
  750. 8, hub->tt.think_time);
  751. }
  752. break;
  753. case HUB_TTTT_16_BITS:
  754. hub->tt.think_time = 666 * 2;
  755. dev_dbg(hub_dev, "TT requires at most %d "
  756. "FS bit times (%d ns)\n",
  757. 16, hub->tt.think_time);
  758. break;
  759. case HUB_TTTT_24_BITS:
  760. hub->tt.think_time = 666 * 3;
  761. dev_dbg(hub_dev, "TT requires at most %d "
  762. "FS bit times (%d ns)\n",
  763. 24, hub->tt.think_time);
  764. break;
  765. case HUB_TTTT_32_BITS:
  766. hub->tt.think_time = 666 * 4;
  767. dev_dbg(hub_dev, "TT requires at most %d "
  768. "FS bit times (%d ns)\n",
  769. 32, hub->tt.think_time);
  770. break;
  771. }
  772. /* probe() zeroes hub->indicator[] */
  773. if (wHubCharacteristics & HUB_CHAR_PORTIND) {
  774. hub->has_indicators = 1;
  775. dev_dbg(hub_dev, "Port indicators are supported\n");
  776. }
  777. dev_dbg(hub_dev, "power on to power good time: %dms\n",
  778. hub->descriptor->bPwrOn2PwrGood * 2);
  779. /* power budgeting mostly matters with bus-powered hubs,
  780. * and battery-powered root hubs (may provide just 8 mA).
  781. */
  782. ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
  783. if (ret < 2) {
  784. message = "can't get hub status";
  785. goto fail;
  786. }
  787. le16_to_cpus(&hubstatus);
  788. if (hdev == hdev->bus->root_hub) {
  789. if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
  790. hub->mA_per_port = 500;
  791. else {
  792. hub->mA_per_port = hdev->bus_mA;
  793. hub->limited_power = 1;
  794. }
  795. } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
  796. dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
  797. hub->descriptor->bHubContrCurrent);
  798. hub->limited_power = 1;
  799. if (hdev->maxchild > 0) {
  800. int remaining = hdev->bus_mA -
  801. hub->descriptor->bHubContrCurrent;
  802. if (remaining < hdev->maxchild * 100)
  803. dev_warn(hub_dev,
  804. "insufficient power available "
  805. "to use all downstream ports\n");
  806. hub->mA_per_port = 100; /* 7.2.1.1 */
  807. }
  808. } else { /* Self-powered external hub */
  809. /* FIXME: What about battery-powered external hubs that
  810. * provide less current per port? */
  811. hub->mA_per_port = 500;
  812. }
  813. if (hub->mA_per_port < 500)
  814. dev_dbg(hub_dev, "%umA bus power budget for each child\n",
  815. hub->mA_per_port);
  816. ret = hub_hub_status(hub, &hubstatus, &hubchange);
  817. if (ret < 0) {
  818. message = "can't get hub status";
  819. goto fail;
  820. }
  821. /* local power status reports aren't always correct */
  822. if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
  823. dev_dbg(hub_dev, "local power source is %s\n",
  824. (hubstatus & HUB_STATUS_LOCAL_POWER)
  825. ? "lost (inactive)" : "good");
  826. if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
  827. dev_dbg(hub_dev, "%sover-current condition exists\n",
  828. (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
  829. /* set up the interrupt endpoint
  830. * We use the EP's maxpacket size instead of (PORTS+1+7)/8
  831. * bytes as USB2.0[11.12.3] says because some hubs are known
  832. * to send more data (and thus cause overflow). For root hubs,
  833. * maxpktsize is defined in hcd.c's fake endpoint descriptors
  834. * to be big enough for at least USB_MAXCHILDREN ports. */
  835. pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
  836. maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
  837. if (maxp > sizeof(*hub->buffer))
  838. maxp = sizeof(*hub->buffer);
  839. hub->urb = usb_alloc_urb(0, GFP_KERNEL);
  840. if (!hub->urb) {
  841. message = "couldn't allocate interrupt urb";
  842. ret = -ENOMEM;
  843. goto fail;
  844. }
  845. usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
  846. hub, endpoint->bInterval);
  847. hub->urb->transfer_dma = hub->buffer_dma;
  848. hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
  849. /* maybe cycle the hub leds */
  850. if (hub->has_indicators && blinkenlights)
  851. hub->indicator [0] = INDICATOR_CYCLE;
  852. hub_power_on(hub);
  853. hub_activate(hub);
  854. return 0;
  855. fail:
  856. dev_err (hub_dev, "config failed, %s (err %d)\n",
  857. message, ret);
  858. /* hub_disconnect() frees urb and descriptor */
  859. return ret;
  860. }
  861. static void hub_release(struct kref *kref)
  862. {
  863. struct usb_hub *hub = container_of(kref, struct usb_hub, kref);
  864. usb_put_intf(to_usb_interface(hub->intfdev));
  865. kfree(hub);
  866. }
  867. static unsigned highspeed_hubs;
  868. static void hub_disconnect(struct usb_interface *intf)
  869. {
  870. struct usb_hub *hub = usb_get_intfdata (intf);
  871. /* Take the hub off the event list and don't let it be added again */
  872. spin_lock_irq(&hub_event_lock);
  873. list_del_init(&hub->event_list);
  874. hub->disconnected = 1;
  875. spin_unlock_irq(&hub_event_lock);
  876. /* Disconnect all children and quiesce the hub */
  877. hub->error = 0;
  878. hub_stop(hub);
  879. usb_set_intfdata (intf, NULL);
  880. if (hub->hdev->speed == USB_SPEED_HIGH)
  881. highspeed_hubs--;
  882. usb_free_urb(hub->urb);
  883. kfree(hub->descriptor);
  884. kfree(hub->status);
  885. usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer,
  886. hub->buffer_dma);
  887. kref_put(&hub->kref, hub_release);
  888. }
  889. static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
  890. {
  891. struct usb_host_interface *desc;
  892. struct usb_endpoint_descriptor *endpoint;
  893. struct usb_device *hdev;
  894. struct usb_hub *hub;
  895. desc = intf->cur_altsetting;
  896. hdev = interface_to_usbdev(intf);
  897. #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
  898. if (hdev->parent) {
  899. dev_warn(&intf->dev, "ignoring external hub\n");
  900. return -ENODEV;
  901. }
  902. #endif
  903. /* Some hubs have a subclass of 1, which AFAICT according to the */
  904. /* specs is not defined, but it works */
  905. if ((desc->desc.bInterfaceSubClass != 0) &&
  906. (desc->desc.bInterfaceSubClass != 1)) {
  907. descriptor_error:
  908. dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
  909. return -EIO;
  910. }
  911. /* Multiple endpoints? What kind of mutant ninja-hub is this? */
  912. if (desc->desc.bNumEndpoints != 1)
  913. goto descriptor_error;
  914. endpoint = &desc->endpoint[0].desc;
  915. /* If it's not an interrupt in endpoint, we'd better punt! */
  916. if (!usb_endpoint_is_int_in(endpoint))
  917. goto descriptor_error;
  918. /* We found a hub */
  919. dev_info (&intf->dev, "USB hub found\n");
  920. hub = kzalloc(sizeof(*hub), GFP_KERNEL);
  921. if (!hub) {
  922. dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
  923. return -ENOMEM;
  924. }
  925. kref_init(&hub->kref);
  926. INIT_LIST_HEAD(&hub->event_list);
  927. hub->intfdev = &intf->dev;
  928. hub->hdev = hdev;
  929. INIT_DELAYED_WORK(&hub->leds, led_work);
  930. usb_get_intf(intf);
  931. usb_set_intfdata (intf, hub);
  932. intf->needs_remote_wakeup = 1;
  933. if (hdev->speed == USB_SPEED_HIGH)
  934. highspeed_hubs++;
  935. if (hub_configure(hub, endpoint) >= 0)
  936. return 0;
  937. hub_disconnect (intf);
  938. return -ENODEV;
  939. }
  940. static int
  941. hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
  942. {
  943. struct usb_device *hdev = interface_to_usbdev (intf);
  944. /* assert ifno == 0 (part of hub spec) */
  945. switch (code) {
  946. case USBDEVFS_HUB_PORTINFO: {
  947. struct usbdevfs_hub_portinfo *info = user_data;
  948. int i;
  949. spin_lock_irq(&device_state_lock);
  950. if (hdev->devnum <= 0)
  951. info->nports = 0;
  952. else {
  953. info->nports = hdev->maxchild;
  954. for (i = 0; i < info->nports; i++) {
  955. if (hdev->children[i] == NULL)
  956. info->port[i] = 0;
  957. else
  958. info->port[i] =
  959. hdev->children[i]->devnum;
  960. }
  961. }
  962. spin_unlock_irq(&device_state_lock);
  963. return info->nports + 1;
  964. }
  965. default:
  966. return -ENOSYS;
  967. }
  968. }
  969. static void recursively_mark_NOTATTACHED(struct usb_device *udev)
  970. {
  971. int i;
  972. for (i = 0; i < udev->maxchild; ++i) {
  973. if (udev->children[i])
  974. recursively_mark_NOTATTACHED(udev->children[i]);
  975. }
  976. if (udev->state == USB_STATE_SUSPENDED) {
  977. udev->discon_suspended = 1;
  978. udev->active_duration -= jiffies;
  979. }
  980. udev->state = USB_STATE_NOTATTACHED;
  981. }
  982. /**
  983. * usb_set_device_state - change a device's current state (usbcore, hcds)
  984. * @udev: pointer to device whose state should be changed
  985. * @new_state: new state value to be stored
  986. *
  987. * udev->state is _not_ fully protected by the device lock. Although
  988. * most transitions are made only while holding the lock, the state can
  989. * can change to USB_STATE_NOTATTACHED at almost any time. This
  990. * is so that devices can be marked as disconnected as soon as possible,
  991. * without having to wait for any semaphores to be released. As a result,
  992. * all changes to any device's state must be protected by the
  993. * device_state_lock spinlock.
  994. *
  995. * Once a device has been added to the device tree, all changes to its state
  996. * should be made using this routine. The state should _not_ be set directly.
  997. *
  998. * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
  999. * Otherwise udev->state is set to new_state, and if new_state is
  1000. * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
  1001. * to USB_STATE_NOTATTACHED.
  1002. */
  1003. void usb_set_device_state(struct usb_device *udev,
  1004. enum usb_device_state new_state)
  1005. {
  1006. unsigned long flags;
  1007. spin_lock_irqsave(&device_state_lock, flags);
  1008. if (udev->state == USB_STATE_NOTATTACHED)
  1009. ; /* do nothing */
  1010. else if (new_state != USB_STATE_NOTATTACHED) {
  1011. /* root hub wakeup capabilities are managed out-of-band
  1012. * and may involve silicon errata ... ignore them here.
  1013. */
  1014. if (udev->parent) {
  1015. if (udev->state == USB_STATE_SUSPENDED
  1016. || new_state == USB_STATE_SUSPENDED)
  1017. ; /* No change to wakeup settings */
  1018. else if (new_state == USB_STATE_CONFIGURED)
  1019. device_init_wakeup(&udev->dev,
  1020. (udev->actconfig->desc.bmAttributes
  1021. & USB_CONFIG_ATT_WAKEUP));
  1022. else
  1023. device_init_wakeup(&udev->dev, 0);
  1024. }
  1025. if (udev->state == USB_STATE_SUSPENDED &&
  1026. new_state != USB_STATE_SUSPENDED)
  1027. udev->active_duration -= jiffies;
  1028. else if (new_state == USB_STATE_SUSPENDED &&
  1029. udev->state != USB_STATE_SUSPENDED)
  1030. udev->active_duration += jiffies;
  1031. udev->state = new_state;
  1032. } else
  1033. recursively_mark_NOTATTACHED(udev);
  1034. spin_unlock_irqrestore(&device_state_lock, flags);
  1035. }
  1036. /*
  1037. * WUSB devices are simple: they have no hubs behind, so the mapping
  1038. * device <-> virtual port number becomes 1:1. Why? to simplify the
  1039. * life of the device connection logic in
  1040. * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
  1041. * handshake we need to assign a temporary address in the unauthorized
  1042. * space. For simplicity we use the first virtual port number found to
  1043. * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
  1044. * and that becomes it's address [X < 128] or its unauthorized address
  1045. * [X | 0x80].
  1046. *
  1047. * We add 1 as an offset to the one-based USB-stack port number
  1048. * (zero-based wusb virtual port index) for two reasons: (a) dev addr
  1049. * 0 is reserved by USB for default address; (b) Linux's USB stack
  1050. * uses always #1 for the root hub of the controller. So USB stack's
  1051. * port #1, which is wusb virtual-port #0 has address #2.
  1052. */
  1053. static void choose_address(struct usb_device *udev)
  1054. {
  1055. int devnum;
  1056. struct usb_bus *bus = udev->bus;
  1057. /* If khubd ever becomes multithreaded, this will need a lock */
  1058. if (udev->wusb) {
  1059. devnum = udev->portnum + 1;
  1060. BUG_ON(test_bit(devnum, bus->devmap.devicemap));
  1061. } else {
  1062. /* Try to allocate the next devnum beginning at
  1063. * bus->devnum_next. */
  1064. devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
  1065. bus->devnum_next);
  1066. if (devnum >= 128)
  1067. devnum = find_next_zero_bit(bus->devmap.devicemap,
  1068. 128, 1);
  1069. bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
  1070. }
  1071. if (devnum < 128) {
  1072. set_bit(devnum, bus->devmap.devicemap);
  1073. udev->devnum = devnum;
  1074. }
  1075. }
  1076. static void release_address(struct usb_device *udev)
  1077. {
  1078. if (udev->devnum > 0) {
  1079. clear_bit(udev->devnum, udev->bus->devmap.devicemap);
  1080. udev->devnum = -1;
  1081. }
  1082. }
  1083. static void update_address(struct usb_device *udev, int devnum)
  1084. {
  1085. /* The address for a WUSB device is managed by wusbcore. */
  1086. if (!udev->wusb)
  1087. udev->devnum = devnum;
  1088. }
  1089. #ifdef CONFIG_USB_SUSPEND
  1090. static void usb_stop_pm(struct usb_device *udev)
  1091. {
  1092. /* Synchronize with the ksuspend thread to prevent any more
  1093. * autosuspend requests from being submitted, and decrement
  1094. * the parent's count of unsuspended children.
  1095. */
  1096. usb_pm_lock(udev);
  1097. if (udev->parent && !udev->discon_suspended)
  1098. usb_autosuspend_device(udev->parent);
  1099. usb_pm_unlock(udev);
  1100. /* Stop any autosuspend requests already submitted */
  1101. cancel_rearming_delayed_work(&udev->autosuspend);
  1102. }
  1103. #else
  1104. static inline void usb_stop_pm(struct usb_device *udev)
  1105. { }
  1106. #endif
  1107. /**
  1108. * usb_disconnect - disconnect a device (usbcore-internal)
  1109. * @pdev: pointer to device being disconnected
  1110. * Context: !in_interrupt ()
  1111. *
  1112. * Something got disconnected. Get rid of it and all of its children.
  1113. *
  1114. * If *pdev is a normal device then the parent hub must already be locked.
  1115. * If *pdev is a root hub then this routine will acquire the
  1116. * usb_bus_list_lock on behalf of the caller.
  1117. *
  1118. * Only hub drivers (including virtual root hub drivers for host
  1119. * controllers) should ever call this.
  1120. *
  1121. * This call is synchronous, and may not be used in an interrupt context.
  1122. */
  1123. void usb_disconnect(struct usb_device **pdev)
  1124. {
  1125. struct usb_device *udev = *pdev;
  1126. int i;
  1127. if (!udev) {
  1128. pr_debug ("%s nodev\n", __func__);
  1129. return;
  1130. }
  1131. /* mark the device as inactive, so any further urb submissions for
  1132. * this device (and any of its children) will fail immediately.
  1133. * this quiesces everyting except pending urbs.
  1134. */
  1135. usb_set_device_state(udev, USB_STATE_NOTATTACHED);
  1136. dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
  1137. usb_lock_device(udev);
  1138. /* Free up all the children before we remove this device */
  1139. for (i = 0; i < USB_MAXCHILDREN; i++) {
  1140. if (udev->children[i])
  1141. usb_disconnect(&udev->children[i]);
  1142. }
  1143. /* deallocate hcd/hardware state ... nuking all pending urbs and
  1144. * cleaning up all state associated with the current configuration
  1145. * so that the hardware is now fully quiesced.
  1146. */
  1147. dev_dbg (&udev->dev, "unregistering device\n");
  1148. usb_disable_device(udev, 0);
  1149. usb_unlock_device(udev);
  1150. /* Remove the device-specific files from sysfs. This must be
  1151. * done with udev unlocked, because some of the attribute
  1152. * routines try to acquire the device lock.
  1153. */
  1154. usb_remove_sysfs_dev_files(udev);
  1155. /* Unregister the device. The device driver is responsible
  1156. * for removing the device files from usbfs and sysfs and for
  1157. * de-configuring the device.
  1158. */
  1159. device_del(&udev->dev);
  1160. /* Free the device number and delete the parent's children[]
  1161. * (or root_hub) pointer.
  1162. */
  1163. release_address(udev);
  1164. /* Avoid races with recursively_mark_NOTATTACHED() */
  1165. spin_lock_irq(&device_state_lock);
  1166. *pdev = NULL;
  1167. spin_unlock_irq(&device_state_lock);
  1168. usb_stop_pm(udev);
  1169. put_device(&udev->dev);
  1170. }
  1171. #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
  1172. static void show_string(struct usb_device *udev, char *id, char *string)
  1173. {
  1174. if (!string)
  1175. return;
  1176. dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
  1177. }
  1178. static void announce_device(struct usb_device *udev)
  1179. {
  1180. dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n",
  1181. le16_to_cpu(udev->descriptor.idVendor),
  1182. le16_to_cpu(udev->descriptor.idProduct));
  1183. dev_info(&udev->dev, "New USB device strings: Mfr=%d, Product=%d, "
  1184. "SerialNumber=%d\n",
  1185. udev->descriptor.iManufacturer,
  1186. udev->descriptor.iProduct,
  1187. udev->descriptor.iSerialNumber);
  1188. show_string(udev, "Product", udev->product);
  1189. show_string(udev, "Manufacturer", udev->manufacturer);
  1190. show_string(udev, "SerialNumber", udev->serial);
  1191. }
  1192. #else
  1193. static inline void announce_device(struct usb_device *udev) { }
  1194. #endif
  1195. #ifdef CONFIG_USB_OTG
  1196. #include "otg_whitelist.h"
  1197. #endif
  1198. /**
  1199. * usb_configure_device_otg - FIXME (usbcore-internal)
  1200. * @udev: newly addressed device (in ADDRESS state)
  1201. *
  1202. * Do configuration for On-The-Go devices
  1203. */
  1204. static int usb_configure_device_otg(struct usb_device *udev)
  1205. {
  1206. int err = 0;
  1207. #ifdef CONFIG_USB_OTG
  1208. /*
  1209. * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
  1210. * to wake us after we've powered off VBUS; and HNP, switching roles
  1211. * "host" to "peripheral". The OTG descriptor helps figure this out.
  1212. */
  1213. if (!udev->bus->is_b_host
  1214. && udev->config
  1215. && udev->parent == udev->bus->root_hub) {
  1216. struct usb_otg_descriptor *desc = 0;
  1217. struct usb_bus *bus = udev->bus;
  1218. /* descriptor may appear anywhere in config */
  1219. if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
  1220. le16_to_cpu(udev->config[0].desc.wTotalLength),
  1221. USB_DT_OTG, (void **) &desc) == 0) {
  1222. if (desc->bmAttributes & USB_OTG_HNP) {
  1223. unsigned port1 = udev->portnum;
  1224. dev_info(&udev->dev,
  1225. "Dual-Role OTG device on %sHNP port\n",
  1226. (port1 == bus->otg_port)
  1227. ? "" : "non-");
  1228. /* enable HNP before suspend, it's simpler */
  1229. if (port1 == bus->otg_port)
  1230. bus->b_hnp_enable = 1;
  1231. err = usb_control_msg(udev,
  1232. usb_sndctrlpipe(udev, 0),
  1233. USB_REQ_SET_FEATURE, 0,
  1234. bus->b_hnp_enable
  1235. ? USB_DEVICE_B_HNP_ENABLE
  1236. : USB_DEVICE_A_ALT_HNP_SUPPORT,
  1237. 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
  1238. if (err < 0) {
  1239. /* OTG MESSAGE: report errors here,
  1240. * customize to match your product.
  1241. */
  1242. dev_info(&udev->dev,
  1243. "can't set HNP mode; %d\n",
  1244. err);
  1245. bus->b_hnp_enable = 0;
  1246. }
  1247. }
  1248. }
  1249. }
  1250. if (!is_targeted(udev)) {
  1251. /* Maybe it can talk to us, though we can't talk to it.
  1252. * (Includes HNP test device.)
  1253. */
  1254. if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
  1255. err = usb_port_suspend(udev);
  1256. if (err < 0)
  1257. dev_dbg(&udev->dev, "HNP fail, %d\n", err);
  1258. }
  1259. err = -ENOTSUPP;
  1260. goto fail;
  1261. }
  1262. fail:
  1263. #endif
  1264. return err;
  1265. }
  1266. /**
  1267. * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal)
  1268. * @udev: newly addressed device (in ADDRESS state)
  1269. *
  1270. * This is only called by usb_new_device() and usb_authorize_device()
  1271. * and FIXME -- all comments that apply to them apply here wrt to
  1272. * environment.
  1273. *
  1274. * If the device is WUSB and not authorized, we don't attempt to read
  1275. * the string descriptors, as they will be errored out by the device
  1276. * until it has been authorized.
  1277. */
  1278. static int usb_configure_device(struct usb_device *udev)
  1279. {
  1280. int err;
  1281. if (udev->config == NULL) {
  1282. err = usb_get_configuration(udev);
  1283. if (err < 0) {
  1284. dev_err(&udev->dev, "can't read configurations, error %d\n",
  1285. err);
  1286. goto fail;
  1287. }
  1288. }
  1289. if (udev->wusb == 1 && udev->authorized == 0) {
  1290. udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
  1291. udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
  1292. udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
  1293. }
  1294. else {
  1295. /* read the standard strings and cache them if present */
  1296. udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
  1297. udev->manufacturer = usb_cache_string(udev,
  1298. udev->descriptor.iManufacturer);
  1299. udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
  1300. }
  1301. err = usb_configure_device_otg(udev);
  1302. fail:
  1303. return err;
  1304. }
  1305. /**
  1306. * usb_new_device - perform initial device setup (usbcore-internal)
  1307. * @udev: newly addressed device (in ADDRESS state)
  1308. *
  1309. * This is called with devices which have been enumerated, but not yet
  1310. * configured. The device descriptor is available, but not descriptors
  1311. * for any device configuration. The caller must have locked either
  1312. * the parent hub (if udev is a normal device) or else the
  1313. * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
  1314. * udev has already been installed, but udev is not yet visible through
  1315. * sysfs or other filesystem code.
  1316. *
  1317. * It will return if the device is configured properly or not. Zero if
  1318. * the interface was registered with the driver core; else a negative
  1319. * errno value.
  1320. *
  1321. * This call is synchronous, and may not be used in an interrupt context.
  1322. *
  1323. * Only the hub driver or root-hub registrar should ever call this.
  1324. */
  1325. int usb_new_device(struct usb_device *udev)
  1326. {
  1327. int err;
  1328. usb_detect_quirks(udev); /* Determine quirks */
  1329. err = usb_configure_device(udev); /* detect & probe dev/intfs */
  1330. if (err < 0)
  1331. goto fail;
  1332. /* export the usbdev device-node for libusb */
  1333. udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
  1334. (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
  1335. /* Increment the parent's count of unsuspended children */
  1336. if (udev->parent)
  1337. usb_autoresume_device(udev->parent);
  1338. /* Register the device. The device driver is responsible
  1339. * for adding the device files to sysfs and for configuring
  1340. * the device.
  1341. */
  1342. err = device_add(&udev->dev);
  1343. if (err) {
  1344. dev_err(&udev->dev, "can't device_add, error %d\n", err);
  1345. goto fail;
  1346. }
  1347. /* put device-specific files into sysfs */
  1348. usb_create_sysfs_dev_files(udev);
  1349. /* Tell the world! */
  1350. announce_device(udev);
  1351. return err;
  1352. fail:
  1353. usb_set_device_state(udev, USB_STATE_NOTATTACHED);
  1354. return err;
  1355. }
  1356. /**
  1357. * usb_deauthorize_device - deauthorize a device (usbcore-internal)
  1358. * @usb_dev: USB device
  1359. *
  1360. * Move the USB device to a very basic state where interfaces are disabled
  1361. * and the device is in fact unconfigured and unusable.
  1362. *
  1363. * We share a lock (that we have) with device_del(), so we need to
  1364. * defer its call.
  1365. */
  1366. int usb_deauthorize_device(struct usb_device *usb_dev)
  1367. {
  1368. unsigned cnt;
  1369. usb_lock_device(usb_dev);
  1370. if (usb_dev->authorized == 0)
  1371. goto out_unauthorized;
  1372. usb_dev->authorized = 0;
  1373. usb_set_configuration(usb_dev, -1);
  1374. usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
  1375. usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
  1376. usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
  1377. kfree(usb_dev->config);
  1378. usb_dev->config = NULL;
  1379. for (cnt = 0; cnt < usb_dev->descriptor.bNumConfigurations; cnt++)
  1380. kfree(usb_dev->rawdescriptors[cnt]);
  1381. usb_dev->descriptor.bNumConfigurations = 0;
  1382. kfree(usb_dev->rawdescriptors);
  1383. out_unauthorized:
  1384. usb_unlock_device(usb_dev);
  1385. return 0;
  1386. }
  1387. int usb_authorize_device(struct usb_device *usb_dev)
  1388. {
  1389. int result = 0, c;
  1390. usb_lock_device(usb_dev);
  1391. if (usb_dev->authorized == 1)
  1392. goto out_authorized;
  1393. kfree(usb_dev->product);
  1394. usb_dev->product = NULL;
  1395. kfree(usb_dev->manufacturer);
  1396. usb_dev->manufacturer = NULL;
  1397. kfree(usb_dev->serial);
  1398. usb_dev->serial = NULL;
  1399. result = usb_autoresume_device(usb_dev);
  1400. if (result < 0) {
  1401. dev_err(&usb_dev->dev,
  1402. "can't autoresume for authorization: %d\n", result);
  1403. goto error_autoresume;
  1404. }
  1405. result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor));
  1406. if (result < 0) {
  1407. dev_err(&usb_dev->dev, "can't re-read device descriptor for "
  1408. "authorization: %d\n", result);
  1409. goto error_device_descriptor;
  1410. }
  1411. usb_dev->authorized = 1;
  1412. result = usb_configure_device(usb_dev);
  1413. if (result < 0)
  1414. goto error_configure;
  1415. /* Choose and set the configuration. This registers the interfaces
  1416. * with the driver core and lets interface drivers bind to them.
  1417. */
  1418. c = usb_choose_configuration(usb_dev);
  1419. if (c >= 0) {
  1420. result = usb_set_configuration(usb_dev, c);
  1421. if (result) {
  1422. dev_err(&usb_dev->dev,
  1423. "can't set config #%d, error %d\n", c, result);
  1424. /* This need not be fatal. The user can try to
  1425. * set other configurations. */
  1426. }
  1427. }
  1428. dev_info(&usb_dev->dev, "authorized to connect\n");
  1429. error_configure:
  1430. error_device_descriptor:
  1431. error_autoresume:
  1432. out_authorized:
  1433. usb_unlock_device(usb_dev); // complements locktree
  1434. return result;
  1435. }
  1436. /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
  1437. static unsigned hub_is_wusb(struct usb_hub *hub)
  1438. {
  1439. struct usb_hcd *hcd;
  1440. if (hub->hdev->parent != NULL) /* not a root hub? */
  1441. return 0;
  1442. hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
  1443. return hcd->wireless;
  1444. }
  1445. #define PORT_RESET_TRIES 5
  1446. #define SET_ADDRESS_TRIES 2
  1447. #define GET_DESCRIPTOR_TRIES 2
  1448. #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
  1449. #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
  1450. #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
  1451. #define HUB_SHORT_RESET_TIME 10
  1452. #define HUB_LONG_RESET_TIME 200
  1453. #define HUB_RESET_TIMEOUT 500
  1454. static int hub_port_wait_reset(struct usb_hub *hub, int port1,
  1455. struct usb_device *udev, unsigned int delay)
  1456. {
  1457. int delay_time, ret;
  1458. u16 portstatus;
  1459. u16 portchange;
  1460. for (delay_time = 0;
  1461. delay_time < HUB_RESET_TIMEOUT;
  1462. delay_time += delay) {
  1463. /* wait to give the device a chance to reset */
  1464. msleep(delay);
  1465. /* read and decode port status */
  1466. ret = hub_port_status(hub, port1, &portstatus, &portchange);
  1467. if (ret < 0)
  1468. return ret;
  1469. /* Device went away? */
  1470. if (!(portstatus & USB_PORT_STAT_CONNECTION))
  1471. return -ENOTCONN;
  1472. /* bomb out completely if the connection bounced */
  1473. if ((portchange & USB_PORT_STAT_C_CONNECTION))
  1474. return -ENOTCONN;
  1475. /* if we`ve finished resetting, then break out of the loop */
  1476. if (!(portstatus & USB_PORT_STAT_RESET) &&
  1477. (portstatus & USB_PORT_STAT_ENABLE)) {
  1478. if (hub_is_wusb(hub))
  1479. udev->speed = USB_SPEED_VARIABLE;
  1480. else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
  1481. udev->speed = USB_SPEED_HIGH;
  1482. else if (portstatus & USB_PORT_STAT_LOW_SPEED)
  1483. udev->speed = USB_SPEED_LOW;
  1484. else
  1485. udev->speed = USB_SPEED_FULL;
  1486. return 0;
  1487. }
  1488. /* switch to the long delay after two short delay failures */
  1489. if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
  1490. delay = HUB_LONG_RESET_TIME;
  1491. dev_dbg (hub->intfdev,
  1492. "port %d not reset yet, waiting %dms\n",
  1493. port1, delay);
  1494. }
  1495. return -EBUSY;
  1496. }
  1497. static int hub_port_reset(struct usb_hub *hub, int port1,
  1498. struct usb_device *udev, unsigned int delay)
  1499. {
  1500. int i, status;
  1501. /* Block EHCI CF initialization during the port reset.
  1502. * Some companion controllers don't like it when they mix.
  1503. */
  1504. down_read(&ehci_cf_port_reset_rwsem);
  1505. /* Reset the port */
  1506. for (i = 0; i < PORT_RESET_TRIES; i++) {
  1507. status = set_port_feature(hub->hdev,
  1508. port1, USB_PORT_FEAT_RESET);
  1509. if (status)
  1510. dev_err(hub->intfdev,
  1511. "cannot reset port %d (err = %d)\n",
  1512. port1, status);
  1513. else {
  1514. status = hub_port_wait_reset(hub, port1, udev, delay);
  1515. if (status && status != -ENOTCONN)
  1516. dev_dbg(hub->intfdev,
  1517. "port_wait_reset: err = %d\n",
  1518. status);
  1519. }
  1520. /* return on disconnect or reset */
  1521. switch (status) {
  1522. case 0:
  1523. /* TRSTRCY = 10 ms; plus some extra */
  1524. msleep(10 + 40);
  1525. update_address(udev, 0);
  1526. /* FALL THROUGH */
  1527. case -ENOTCONN:
  1528. case -ENODEV:
  1529. clear_port_feature(hub->hdev,
  1530. port1, USB_PORT_FEAT_C_RESET);
  1531. /* FIXME need disconnect() for NOTATTACHED device */
  1532. usb_set_device_state(udev, status
  1533. ? USB_STATE_NOTATTACHED
  1534. : USB_STATE_DEFAULT);
  1535. goto done;
  1536. }
  1537. dev_dbg (hub->intfdev,
  1538. "port %d not enabled, trying reset again...\n",
  1539. port1);
  1540. delay = HUB_LONG_RESET_TIME;
  1541. }
  1542. dev_err (hub->intfdev,
  1543. "Cannot enable port %i. Maybe the USB cable is bad?\n",
  1544. port1);
  1545. done:
  1546. up_read(&ehci_cf_port_reset_rwsem);
  1547. return status;
  1548. }
  1549. #ifdef CONFIG_PM
  1550. #ifdef CONFIG_USB_SUSPEND
  1551. /*
  1552. * usb_port_suspend - suspend a usb device's upstream port
  1553. * @udev: device that's no longer in active use, not a root hub
  1554. * Context: must be able to sleep; device not locked; pm locks held
  1555. *
  1556. * Suspends a USB device that isn't in active use, conserving power.
  1557. * Devices may wake out of a suspend, if anything important happens,
  1558. * using the remote wakeup mechanism. They may also be taken out of
  1559. * suspend by the host, using usb_port_resume(). It's also routine
  1560. * to disconnect devices while they are suspended.
  1561. *
  1562. * This only affects the USB hardware for a device; its interfaces
  1563. * (and, for hubs, child devices) must already have been suspended.
  1564. *
  1565. * Selective port suspend reduces power; most suspended devices draw
  1566. * less than 500 uA. It's also used in OTG, along with remote wakeup.
  1567. * All devices below the suspended port are also suspended.
  1568. *
  1569. * Devices leave suspend state when the host wakes them up. Some devices
  1570. * also support "remote wakeup", where the device can activate the USB
  1571. * tree above them to deliver data, such as a keypress or packet. In
  1572. * some cases, this wakes the USB host.
  1573. *
  1574. * Suspending OTG devices may trigger HNP, if that's been enabled
  1575. * between a pair of dual-role devices. That will change roles, such
  1576. * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
  1577. *
  1578. * Devices on USB hub ports have only one "suspend" state, corresponding
  1579. * to ACPI D2, "may cause the device to lose some context".
  1580. * State transitions include:
  1581. *
  1582. * - suspend, resume ... when the VBUS power link stays live
  1583. * - suspend, disconnect ... VBUS lost
  1584. *
  1585. * Once VBUS drop breaks the circuit, the port it's using has to go through
  1586. * normal re-enumeration procedures, starting with enabling VBUS power.
  1587. * Other than re-initializing the hub (plug/unplug, except for root hubs),
  1588. * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
  1589. * timer, no SRP, no requests through sysfs.
  1590. *
  1591. * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
  1592. * the root hub for their bus goes into global suspend ... so we don't
  1593. * (falsely) update the device power state to say it suspended.
  1594. *
  1595. * Returns 0 on success, else negative errno.
  1596. */
  1597. int usb_port_suspend(struct usb_device *udev)
  1598. {
  1599. struct usb_hub *hub = hdev_to_hub(udev->parent);
  1600. int port1 = udev->portnum;
  1601. int status;
  1602. // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
  1603. /* enable remote wakeup when appropriate; this lets the device
  1604. * wake up the upstream hub (including maybe the root hub).
  1605. *
  1606. * NOTE: OTG devices may issue remote wakeup (or SRP) even when
  1607. * we don't explicitly enable it here.
  1608. */
  1609. if (udev->do_remote_wakeup) {
  1610. status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  1611. USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
  1612. USB_DEVICE_REMOTE_WAKEUP, 0,
  1613. NULL, 0,
  1614. USB_CTRL_SET_TIMEOUT);
  1615. if (status)
  1616. dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
  1617. status);
  1618. }
  1619. /* see 7.1.7.6 */
  1620. status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
  1621. if (status) {
  1622. dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n",
  1623. port1, status);
  1624. /* paranoia: "should not happen" */
  1625. (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  1626. USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
  1627. USB_DEVICE_REMOTE_WAKEUP, 0,
  1628. NULL, 0,
  1629. USB_CTRL_SET_TIMEOUT);
  1630. } else {
  1631. /* device has up to 10 msec to fully suspend */
  1632. dev_dbg(&udev->dev, "usb %ssuspend\n",
  1633. udev->auto_pm ? "auto-" : "");
  1634. usb_set_device_state(udev, USB_STATE_SUSPENDED);
  1635. msleep(10);
  1636. }
  1637. return status;
  1638. }
  1639. /*
  1640. * If the USB "suspend" state is in use (rather than "global suspend"),
  1641. * many devices will be individually taken out of suspend state using
  1642. * special "resume" signaling. This routine kicks in shortly after
  1643. * hardware resume signaling is finished, either because of selective
  1644. * resume (by host) or remote wakeup (by device) ... now see what changed
  1645. * in the tree that's rooted at this device.
  1646. *
  1647. * If @udev->reset_resume is set then the device is reset before the
  1648. * status check is done.
  1649. */
  1650. static int finish_port_resume(struct usb_device *udev)
  1651. {
  1652. int status = 0;
  1653. u16 devstatus;
  1654. /* caller owns the udev device lock */
  1655. dev_dbg(&udev->dev, "finish %sresume\n",
  1656. udev->reset_resume ? "reset-" : "");
  1657. /* usb ch9 identifies four variants of SUSPENDED, based on what
  1658. * state the device resumes to. Linux currently won't see the
  1659. * first two on the host side; they'd be inside hub_port_init()
  1660. * during many timeouts, but khubd can't suspend until later.
  1661. */
  1662. usb_set_device_state(udev, udev->actconfig
  1663. ? USB_STATE_CONFIGURED
  1664. : USB_STATE_ADDRESS);
  1665. /* 10.5.4.5 says not to reset a suspended port if the attached
  1666. * device is enabled for remote wakeup. Hence the reset
  1667. * operation is carried out here, after the port has been
  1668. * resumed.
  1669. */
  1670. if (udev->reset_resume)
  1671. status = usb_reset_device(udev);
  1672. /* 10.5.4.5 says be sure devices in the tree are still there.
  1673. * For now let's assume the device didn't go crazy on resume,
  1674. * and device drivers will know about any resume quirks.
  1675. */
  1676. if (status == 0) {
  1677. devstatus = 0;
  1678. status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
  1679. if (status >= 0)
  1680. status = (status > 0 ? 0 : -ENODEV);
  1681. }
  1682. if (status) {
  1683. dev_dbg(&udev->dev, "gone after usb resume? status %d\n",
  1684. status);
  1685. } else if (udev->actconfig) {
  1686. le16_to_cpus(&devstatus);
  1687. if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
  1688. status = usb_control_msg(udev,
  1689. usb_sndctrlpipe(udev, 0),
  1690. USB_REQ_CLEAR_FEATURE,
  1691. USB_RECIP_DEVICE,
  1692. USB_DEVICE_REMOTE_WAKEUP, 0,
  1693. NULL, 0,
  1694. USB_CTRL_SET_TIMEOUT);
  1695. if (status)
  1696. dev_dbg(&udev->dev, "disable remote "
  1697. "wakeup, status %d\n", status);
  1698. }
  1699. status = 0;
  1700. }
  1701. return status;
  1702. }
  1703. /*
  1704. * usb_port_resume - re-activate a suspended usb device's upstream port
  1705. * @udev: device to re-activate, not a root hub
  1706. * Context: must be able to sleep; device not locked; pm locks held
  1707. *
  1708. * This will re-activate the suspended device, increasing power usage
  1709. * while letting drivers communicate again with its endpoints.
  1710. * USB resume explicitly guarantees that the power session between
  1711. * the host and the device is the same as it was when the device
  1712. * suspended.
  1713. *
  1714. * If @udev->reset_resume is set then this routine won't check that the
  1715. * port is still enabled. Furthermore, finish_port_resume() above will
  1716. * reset @udev. The end result is that a broken power session can be
  1717. * recovered and @udev will appear to persist across a loss of VBUS power.
  1718. *
  1719. * For example, if a host controller doesn't maintain VBUS suspend current
  1720. * during a system sleep or is reset when the system wakes up, all the USB
  1721. * power sessions below it will be broken. This is especially troublesome
  1722. * for mass-storage devices containing mounted filesystems, since the
  1723. * device will appear to have disconnected and all the memory mappings
  1724. * to it will be lost. Using the USB_PERSIST facility, the device can be
  1725. * made to appear as if it had not disconnected.
  1726. *
  1727. * This facility can be dangerous. Although usb_reset_device() makes
  1728. * every effort to insure that the same device is present after the
  1729. * reset as before, it cannot provide a 100% guarantee. Furthermore it's
  1730. * quite possible for a device to remain unaltered but its media to be
  1731. * changed. If the user replaces a flash memory card while the system is
  1732. * asleep, he will have only himself to blame when the filesystem on the
  1733. * new card is corrupted and the system crashes.
  1734. *
  1735. * Returns 0 on success, else negative errno.
  1736. */
  1737. int usb_port_resume(struct usb_device *udev)
  1738. {
  1739. struct usb_hub *hub = hdev_to_hub(udev->parent);
  1740. int port1 = udev->portnum;
  1741. int status;
  1742. u16 portchange, portstatus;
  1743. unsigned mask_flags, want_flags;
  1744. /* Skip the initial Clear-Suspend step for a remote wakeup */
  1745. status = hub_port_status(hub, port1, &portstatus, &portchange);
  1746. if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND))
  1747. goto SuspendCleared;
  1748. // dev_dbg(hub->intfdev, "resume port %d\n", port1);
  1749. set_bit(port1, hub->busy_bits);
  1750. /* see 7.1.7.7; affects power usage, but not budgeting */
  1751. status = clear_port_feature(hub->hdev,
  1752. port1, USB_PORT_FEAT_SUSPEND);
  1753. if (status) {
  1754. dev_dbg(hub->intfdev, "can't resume port %d, status %d\n",
  1755. port1, status);
  1756. } else {
  1757. /* drive resume for at least 20 msec */
  1758. dev_dbg(&udev->dev, "usb %sresume\n",
  1759. udev->auto_pm ? "auto-" : "");
  1760. msleep(25);
  1761. /* Virtual root hubs can trigger on GET_PORT_STATUS to
  1762. * stop resume signaling. Then finish the resume
  1763. * sequence.
  1764. */
  1765. status = hub_port_status(hub, port1, &portstatus, &portchange);
  1766. SuspendCleared:
  1767. if (udev->reset_resume)
  1768. want_flags = USB_PORT_STAT_POWER
  1769. | USB_PORT_STAT_CONNECTION;
  1770. else
  1771. want_flags = USB_PORT_STAT_POWER
  1772. | USB_PORT_STAT_CONNECTION
  1773. | USB_PORT_STAT_ENABLE;
  1774. mask_flags = want_flags | USB_PORT_STAT_SUSPEND;
  1775. if (status < 0 || (portstatus & mask_flags) != want_flags) {
  1776. dev_dbg(hub->intfdev,
  1777. "port %d status %04x.%04x after resume, %d\n",
  1778. port1, portchange, portstatus, status);
  1779. if (status >= 0)
  1780. status = -ENODEV;
  1781. } else {
  1782. if (portchange & USB_PORT_STAT_C_SUSPEND)
  1783. clear_port_feature(hub->hdev, port1,
  1784. USB_PORT_FEAT_C_SUSPEND);
  1785. /* TRSMRCY = 10 msec */
  1786. msleep(10);
  1787. }
  1788. }
  1789. clear_bit(port1, hub->busy_bits);
  1790. if (status == 0)
  1791. status = finish_port_resume(udev);
  1792. if (status < 0) {
  1793. dev_dbg(&udev->dev, "can't resume, status %d\n", status);
  1794. hub_port_logical_disconnect(hub, port1);
  1795. }
  1796. return status;
  1797. }
  1798. static int remote_wakeup(struct usb_device *udev)
  1799. {
  1800. int status = 0;
  1801. usb_lock_device(udev);
  1802. if (udev->state == USB_STATE_SUSPENDED) {
  1803. dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
  1804. usb_mark_last_busy(udev);
  1805. status = usb_external_resume_device(udev);
  1806. }
  1807. usb_unlock_device(udev);
  1808. return status;
  1809. }
  1810. #else /* CONFIG_USB_SUSPEND */
  1811. /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
  1812. int usb_port_suspend(struct usb_device *udev)
  1813. {
  1814. return 0;
  1815. }
  1816. int usb_port_resume(struct usb_device *udev)
  1817. {
  1818. int status = 0;
  1819. /* However we may need to do a reset-resume */
  1820. if (udev->reset_resume) {
  1821. dev_dbg(&udev->dev, "reset-resume\n");
  1822. status = usb_reset_device(udev);
  1823. }
  1824. return status;
  1825. }
  1826. static inline int remote_wakeup(struct usb_device *udev)
  1827. {
  1828. return 0;
  1829. }
  1830. #endif
  1831. static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
  1832. {
  1833. struct usb_hub *hub = usb_get_intfdata (intf);
  1834. struct usb_device *hdev = hub->hdev;
  1835. unsigned port1;
  1836. /* fail if children aren't already suspended */
  1837. for (port1 = 1; port1 <= hdev->maxchild; port1++) {
  1838. struct usb_device *udev;
  1839. udev = hdev->children [port1-1];
  1840. if (udev && udev->can_submit) {
  1841. if (!hdev->auto_pm)
  1842. dev_dbg(&intf->dev, "port %d nyet suspended\n",
  1843. port1);
  1844. return -EBUSY;
  1845. }
  1846. }
  1847. dev_dbg(&intf->dev, "%s\n", __func__);
  1848. /* stop khubd and related activity */
  1849. hub_quiesce(hub);
  1850. return 0;
  1851. }
  1852. static int hub_resume(struct usb_interface *intf)
  1853. {
  1854. struct usb_hub *hub = usb_get_intfdata(intf);
  1855. dev_dbg(&intf->dev, "%s\n", __func__);
  1856. hub_restart(hub, HUB_RESUME);
  1857. return 0;
  1858. }
  1859. static int hub_reset_resume(struct usb_interface *intf)
  1860. {
  1861. struct usb_hub *hub = usb_get_intfdata(intf);
  1862. dev_dbg(&intf->dev, "%s\n", __func__);
  1863. hub_power_on(hub);
  1864. hub_restart(hub, HUB_RESET_RESUME);
  1865. return 0;
  1866. }
  1867. /**
  1868. * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
  1869. * @rhdev: struct usb_device for the root hub
  1870. *
  1871. * The USB host controller driver calls this function when its root hub
  1872. * is resumed and Vbus power has been interrupted or the controller
  1873. * has been reset. The routine marks @rhdev as having lost power.
  1874. * When the hub driver is resumed it will take notice and carry out
  1875. * power-session recovery for all the "USB-PERSIST"-enabled child devices;
  1876. * the others will be disconnected.
  1877. */
  1878. void usb_root_hub_lost_power(struct usb_device *rhdev)
  1879. {
  1880. dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
  1881. rhdev->reset_resume = 1;
  1882. }
  1883. EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
  1884. #else /* CONFIG_PM */
  1885. static inline int remote_wakeup(struct usb_device *udev)
  1886. {
  1887. return 0;
  1888. }
  1889. #define hub_suspend NULL
  1890. #define hub_resume NULL
  1891. #define hub_reset_resume NULL
  1892. #endif
  1893. /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
  1894. *
  1895. * Between connect detection and reset signaling there must be a delay
  1896. * of 100ms at least for debounce and power-settling. The corresponding
  1897. * timer shall restart whenever the downstream port detects a disconnect.
  1898. *
  1899. * Apparently there are some bluetooth and irda-dongles and a number of
  1900. * low-speed devices for which this debounce period may last over a second.
  1901. * Not covered by the spec - but easy to deal with.
  1902. *
  1903. * This implementation uses a 1500ms total debounce timeout; if the
  1904. * connection isn't stable by then it returns -ETIMEDOUT. It checks
  1905. * every 25ms for transient disconnects. When the port status has been
  1906. * unchanged for 100ms it returns the port status.
  1907. */
  1908. #define HUB_DEBOUNCE_TIMEOUT 1500
  1909. #define HUB_DEBOUNCE_STEP 25
  1910. #define HUB_DEBOUNCE_STABLE 100
  1911. static int hub_port_debounce(struct usb_hub *hub, int port1)
  1912. {
  1913. int ret;
  1914. int total_time, stable_time = 0;
  1915. u16 portchange, portstatus;
  1916. unsigned connection = 0xffff;
  1917. for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
  1918. ret = hub_port_status(hub, port1, &portstatus, &portchange);
  1919. if (ret < 0)
  1920. return ret;
  1921. if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
  1922. (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
  1923. stable_time += HUB_DEBOUNCE_STEP;
  1924. if (stable_time >= HUB_DEBOUNCE_STABLE)
  1925. break;
  1926. } else {
  1927. stable_time = 0;
  1928. connection = portstatus & USB_PORT_STAT_CONNECTION;
  1929. }
  1930. if (portchange & USB_PORT_STAT_C_CONNECTION) {
  1931. clear_port_feature(hub->hdev, port1,
  1932. USB_PORT_FEAT_C_CONNECTION);
  1933. }
  1934. if (total_time >= HUB_DEBOUNCE_TIMEOUT)
  1935. break;
  1936. msleep(HUB_DEBOUNCE_STEP);
  1937. }
  1938. dev_dbg (hub->intfdev,
  1939. "debounce: port %d: total %dms stable %dms status 0x%x\n",
  1940. port1, total_time, stable_time, portstatus);
  1941. if (stable_time < HUB_DEBOUNCE_STABLE)
  1942. return -ETIMEDOUT;
  1943. return portstatus;
  1944. }
  1945. void usb_ep0_reinit(struct usb_device *udev)
  1946. {
  1947. usb_disable_endpoint(udev, 0 + USB_DIR_IN);
  1948. usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
  1949. usb_enable_endpoint(udev, &udev->ep0);
  1950. }
  1951. EXPORT_SYMBOL_GPL(usb_ep0_reinit);
  1952. #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
  1953. #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
  1954. static int hub_set_address(struct usb_device *udev, int devnum)
  1955. {
  1956. int retval;
  1957. if (devnum <= 1)
  1958. return -EINVAL;
  1959. if (udev->state == USB_STATE_ADDRESS)
  1960. return 0;
  1961. if (udev->state != USB_STATE_DEFAULT)
  1962. return -EINVAL;
  1963. retval = usb_control_msg(udev, usb_sndaddr0pipe(),
  1964. USB_REQ_SET_ADDRESS, 0, devnum, 0,
  1965. NULL, 0, USB_CTRL_SET_TIMEOUT);
  1966. if (retval == 0) {
  1967. /* Device now using proper address. */
  1968. update_address(udev, devnum);
  1969. usb_set_device_state(udev, USB_STATE_ADDRESS);
  1970. usb_ep0_reinit(udev);
  1971. }
  1972. return retval;
  1973. }
  1974. /* Reset device, (re)assign address, get device descriptor.
  1975. * Device connection must be stable, no more debouncing needed.
  1976. * Returns device in USB_STATE_ADDRESS, except on error.
  1977. *
  1978. * If this is called for an already-existing device (as part of
  1979. * usb_reset_device), the caller must own the device lock. For a
  1980. * newly detected device that is not accessible through any global
  1981. * pointers, it's not necessary to lock the device.
  1982. */
  1983. static int
  1984. hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
  1985. int retry_counter)
  1986. {
  1987. static DEFINE_MUTEX(usb_address0_mutex);
  1988. struct usb_device *hdev = hub->hdev;
  1989. int i, j, retval;
  1990. unsigned delay = HUB_SHORT_RESET_TIME;
  1991. enum usb_device_speed oldspeed = udev->speed;
  1992. char *speed, *type;
  1993. int devnum = udev->devnum;
  1994. /* root hub ports have a slightly longer reset period
  1995. * (from USB 2.0 spec, section 7.1.7.5)
  1996. */
  1997. if (!hdev->parent) {
  1998. delay = HUB_ROOT_RESET_TIME;
  1999. if (port1 == hdev->bus->otg_port)
  2000. hdev->bus->b_hnp_enable = 0;
  2001. }
  2002. /* Some low speed devices have problems with the quick delay, so */
  2003. /* be a bit pessimistic with those devices. RHbug #23670 */
  2004. if (oldspeed == USB_SPEED_LOW)
  2005. delay = HUB_LONG_RESET_TIME;
  2006. mutex_lock(&usb_address0_mutex);
  2007. /* Reset the device; full speed may morph to high speed */
  2008. retval = hub_port_reset(hub, port1, udev, delay);
  2009. if (retval < 0) /* error or disconnect */
  2010. goto fail;
  2011. /* success, speed is known */
  2012. retval = -ENODEV;
  2013. if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
  2014. dev_dbg(&udev->dev, "device reset changed speed!\n");
  2015. goto fail;
  2016. }
  2017. oldspeed = udev->speed;
  2018. /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
  2019. * it's fixed size except for full speed devices.
  2020. * For Wireless USB devices, ep0 max packet is always 512 (tho
  2021. * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
  2022. */
  2023. switch (udev->speed) {
  2024. case USB_SPEED_VARIABLE: /* fixed at 512 */
  2025. udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512);
  2026. break;
  2027. case USB_SPEED_HIGH: /* fixed at 64 */
  2028. udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
  2029. break;
  2030. case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
  2031. /* to determine the ep0 maxpacket size, try to read
  2032. * the device descriptor to get bMaxPacketSize0 and
  2033. * then correct our initial guess.
  2034. */
  2035. udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
  2036. break;
  2037. case USB_SPEED_LOW: /* fixed at 8 */
  2038. udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
  2039. break;
  2040. default:
  2041. goto fail;
  2042. }
  2043. type = "";
  2044. switch (udev->speed) {
  2045. case USB_SPEED_LOW: speed = "low"; break;
  2046. case USB_SPEED_FULL: speed = "full"; break;
  2047. case USB_SPEED_HIGH: speed = "high"; break;
  2048. case USB_SPEED_VARIABLE:
  2049. speed = "variable";
  2050. type = "Wireless ";
  2051. break;
  2052. default: speed = "?"; break;
  2053. }
  2054. dev_info (&udev->dev,
  2055. "%s %s speed %sUSB device using %s and address %d\n",
  2056. (udev->config) ? "reset" : "new", speed, type,
  2057. udev->bus->controller->driver->name, devnum);
  2058. /* Set up TT records, if needed */
  2059. if (hdev->tt) {
  2060. udev->tt = hdev->tt;
  2061. udev->ttport = hdev->ttport;
  2062. } else if (udev->speed != USB_SPEED_HIGH
  2063. && hdev->speed == USB_SPEED_HIGH) {
  2064. udev->tt = &hub->tt;
  2065. udev->ttport = port1;
  2066. }
  2067. /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
  2068. * Because device hardware and firmware is sometimes buggy in
  2069. * this area, and this is how Linux has done it for ages.
  2070. * Change it cautiously.
  2071. *
  2072. * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
  2073. * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
  2074. * so it may help with some non-standards-compliant devices.
  2075. * Otherwise we start with SET_ADDRESS and then try to read the
  2076. * first 8 bytes of the device descriptor to get the ep0 maxpacket
  2077. * value.
  2078. */
  2079. for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
  2080. if (USE_NEW_SCHEME(retry_counter)) {
  2081. struct usb_device_descriptor *buf;
  2082. int r = 0;
  2083. #define GET_DESCRIPTOR_BUFSIZE 64
  2084. buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
  2085. if (!buf) {
  2086. retval = -ENOMEM;
  2087. continue;
  2088. }
  2089. /* Retry on all errors; some devices are flakey.
  2090. * 255 is for WUSB devices, we actually need to use
  2091. * 512 (WUSB1.0[4.8.1]).
  2092. */
  2093. for (j = 0; j < 3; ++j) {
  2094. buf->bMaxPacketSize0 = 0;
  2095. r = usb_control_msg(udev, usb_rcvaddr0pipe(),
  2096. USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
  2097. USB_DT_DEVICE << 8, 0,
  2098. buf, GET_DESCRIPTOR_BUFSIZE,
  2099. USB_CTRL_GET_TIMEOUT);
  2100. switch (buf->bMaxPacketSize0) {
  2101. case 8: case 16: case 32: case 64: case 255:
  2102. if (buf->bDescriptorType ==
  2103. USB_DT_DEVICE) {
  2104. r = 0;
  2105. break;
  2106. }
  2107. /* FALL THROUGH */
  2108. default:
  2109. if (r == 0)
  2110. r = -EPROTO;
  2111. break;
  2112. }
  2113. if (r == 0)
  2114. break;
  2115. }
  2116. udev->descriptor.bMaxPacketSize0 =
  2117. buf->bMaxPacketSize0;
  2118. kfree(buf);
  2119. retval = hub_port_reset(hub, port1, udev, delay);
  2120. if (retval < 0) /* error or disconnect */
  2121. goto fail;
  2122. if (oldspeed != udev->speed) {
  2123. dev_dbg(&udev->dev,
  2124. "device reset changed speed!\n");
  2125. retval = -ENODEV;
  2126. goto fail;
  2127. }
  2128. if (r) {
  2129. dev_err(&udev->dev, "device descriptor "
  2130. "read/%s, error %d\n",
  2131. "64", r);
  2132. retval = -EMSGSIZE;
  2133. continue;
  2134. }
  2135. #undef GET_DESCRIPTOR_BUFSIZE
  2136. }
  2137. /*
  2138. * If device is WUSB, we already assigned an
  2139. * unauthorized address in the Connect Ack sequence;
  2140. * authorization will assign the final address.
  2141. */
  2142. if (udev->wusb == 0) {
  2143. for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
  2144. retval = hub_set_address(udev, devnum);
  2145. if (retval >= 0)
  2146. break;
  2147. msleep(200);
  2148. }
  2149. if (retval < 0) {
  2150. dev_err(&udev->dev,
  2151. "device not accepting address %d, error %d\n",
  2152. devnum, retval);
  2153. goto fail;
  2154. }
  2155. /* cope with hardware quirkiness:
  2156. * - let SET_ADDRESS settle, some device hardware wants it
  2157. * - read ep0 maxpacket even for high and low speed,
  2158. */
  2159. msleep(10);
  2160. if (USE_NEW_SCHEME(retry_counter))
  2161. break;
  2162. }
  2163. retval = usb_get_device_descriptor(udev, 8);
  2164. if (retval < 8) {
  2165. dev_err(&udev->dev, "device descriptor "
  2166. "read/%s, error %d\n",
  2167. "8", retval);
  2168. if (retval >= 0)
  2169. retval = -EMSGSIZE;
  2170. } else {
  2171. retval = 0;
  2172. break;
  2173. }
  2174. }
  2175. if (retval)
  2176. goto fail;
  2177. i = udev->descriptor.bMaxPacketSize0 == 0xff? /* wusb device? */
  2178. 512 : udev->descriptor.bMaxPacketSize0;
  2179. if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
  2180. if (udev->speed != USB_SPEED_FULL ||
  2181. !(i == 8 || i == 16 || i == 32 || i == 64)) {
  2182. dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
  2183. retval = -EMSGSIZE;
  2184. goto fail;
  2185. }
  2186. dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
  2187. udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
  2188. usb_ep0_reinit(udev);
  2189. }
  2190. retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
  2191. if (retval < (signed)sizeof(udev->descriptor)) {
  2192. dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
  2193. "all", retval);
  2194. if (retval >= 0)
  2195. retval = -ENOMSG;
  2196. goto fail;
  2197. }
  2198. retval = 0;
  2199. fail:
  2200. if (retval) {
  2201. hub_port_disable(hub, port1, 0);
  2202. update_address(udev, devnum); /* for disconnect processing */
  2203. }
  2204. mutex_unlock(&usb_address0_mutex);
  2205. return retval;
  2206. }
  2207. static void
  2208. check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
  2209. {
  2210. struct usb_qualifier_descriptor *qual;
  2211. int status;
  2212. qual = kmalloc (sizeof *qual, GFP_KERNEL);
  2213. if (qual == NULL)
  2214. return;
  2215. status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
  2216. qual, sizeof *qual);
  2217. if (status == sizeof *qual) {
  2218. dev_info(&udev->dev, "not running at top speed; "
  2219. "connect to a high speed hub\n");
  2220. /* hub LEDs are probably harder to miss than syslog */
  2221. if (hub->has_indicators) {
  2222. hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
  2223. schedule_delayed_work (&hub->leds, 0);
  2224. }
  2225. }
  2226. kfree(qual);
  2227. }
  2228. static unsigned
  2229. hub_power_remaining (struct usb_hub *hub)
  2230. {
  2231. struct usb_device *hdev = hub->hdev;
  2232. int remaining;
  2233. int port1;
  2234. if (!hub->limited_power)
  2235. return 0;
  2236. remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
  2237. for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
  2238. struct usb_device *udev = hdev->children[port1 - 1];
  2239. int delta;
  2240. if (!udev)
  2241. continue;
  2242. /* Unconfigured devices may not use more than 100mA,
  2243. * or 8mA for OTG ports */
  2244. if (udev->actconfig)
  2245. delta = udev->actconfig->desc.bMaxPower * 2;
  2246. else if (port1 != udev->bus->otg_port || hdev->parent)
  2247. delta = 100;
  2248. else
  2249. delta = 8;
  2250. if (delta > hub->mA_per_port)
  2251. dev_warn(&udev->dev, "%dmA is over %umA budget "
  2252. "for port %d!\n",
  2253. delta, hub->mA_per_port, port1);
  2254. remaining -= delta;
  2255. }
  2256. if (remaining < 0) {
  2257. dev_warn(hub->intfdev, "%dmA over power budget!\n",
  2258. - remaining);
  2259. remaining = 0;
  2260. }
  2261. return remaining;
  2262. }
  2263. /* Handle physical or logical connection change events.
  2264. * This routine is called when:
  2265. * a port connection-change occurs;
  2266. * a port enable-change occurs (often caused by EMI);
  2267. * usb_reset_device() encounters changed descriptors (as from
  2268. * a firmware download)
  2269. * caller already locked the hub
  2270. */
  2271. static void hub_port_connect_change(struct usb_hub *hub, int port1,
  2272. u16 portstatus, u16 portchange)
  2273. {
  2274. struct usb_device *hdev = hub->hdev;
  2275. struct device *hub_dev = hub->intfdev;
  2276. struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
  2277. u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
  2278. int status, i;
  2279. dev_dbg (hub_dev,
  2280. "port %d, status %04x, change %04x, %s\n",
  2281. port1, portstatus, portchange, portspeed (portstatus));
  2282. if (hub->has_indicators) {
  2283. set_port_led(hub, port1, HUB_LED_AUTO);
  2284. hub->indicator[port1-1] = INDICATOR_AUTO;
  2285. }
  2286. /* Disconnect any existing devices under this port */
  2287. if (hdev->children[port1-1])
  2288. usb_disconnect(&hdev->children[port1-1]);
  2289. clear_bit(port1, hub->change_bits);
  2290. #ifdef CONFIG_USB_OTG
  2291. /* during HNP, don't repeat the debounce */
  2292. if (hdev->bus->is_b_host)
  2293. portchange &= ~USB_PORT_STAT_C_CONNECTION;
  2294. #endif
  2295. if (portchange & USB_PORT_STAT_C_CONNECTION) {
  2296. status = hub_port_debounce(hub, port1);
  2297. if (status < 0) {
  2298. if (printk_ratelimit())
  2299. dev_err (hub_dev, "connect-debounce failed, "
  2300. "port %d disabled\n", port1);
  2301. goto done;
  2302. }
  2303. portstatus = status;
  2304. }
  2305. /* Return now if nothing is connected */
  2306. if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
  2307. /* maybe switch power back on (e.g. root hub was reset) */
  2308. if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
  2309. && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
  2310. set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
  2311. if (portstatus & USB_PORT_STAT_ENABLE)
  2312. goto done;
  2313. return;
  2314. }
  2315. for (i = 0; i < SET_CONFIG_TRIES; i++) {
  2316. struct usb_device *udev;
  2317. /* reallocate for each attempt, since references
  2318. * to the previous one can escape in various ways
  2319. */
  2320. udev = usb_alloc_dev(hdev, hdev->bus, port1);
  2321. if (!udev) {
  2322. dev_err (hub_dev,
  2323. "couldn't allocate port %d usb_device\n",
  2324. port1);
  2325. goto done;
  2326. }
  2327. usb_set_device_state(udev, USB_STATE_POWERED);
  2328. udev->speed = USB_SPEED_UNKNOWN;
  2329. udev->bus_mA = hub->mA_per_port;
  2330. udev->level = hdev->level + 1;
  2331. udev->wusb = hub_is_wusb(hub);
  2332. /* set the address */
  2333. choose_address(udev);
  2334. if (udev->devnum <= 0) {
  2335. status = -ENOTCONN; /* Don't retry */
  2336. goto loop;
  2337. }
  2338. /* reset and get descriptor */
  2339. status = hub_port_init(hub, udev, port1, i);
  2340. if (status < 0)
  2341. goto loop;
  2342. /* consecutive bus-powered hubs aren't reliable; they can
  2343. * violate the voltage drop budget. if the new child has
  2344. * a "powered" LED, users should notice we didn't enable it
  2345. * (without reading syslog), even without per-port LEDs
  2346. * on the parent.
  2347. */
  2348. if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
  2349. && udev->bus_mA <= 100) {
  2350. u16 devstat;
  2351. status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
  2352. &devstat);
  2353. if (status < 2) {
  2354. dev_dbg(&udev->dev, "get status %d ?\n", status);
  2355. goto loop_disable;
  2356. }
  2357. le16_to_cpus(&devstat);
  2358. if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
  2359. dev_err(&udev->dev,
  2360. "can't connect bus-powered hub "
  2361. "to this port\n");
  2362. if (hub->has_indicators) {
  2363. hub->indicator[port1-1] =
  2364. INDICATOR_AMBER_BLINK;
  2365. schedule_delayed_work (&hub->leds, 0);
  2366. }
  2367. status = -ENOTCONN; /* Don't retry */
  2368. goto loop_disable;
  2369. }
  2370. }
  2371. /* check for devices running slower than they could */
  2372. if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
  2373. && udev->speed == USB_SPEED_FULL
  2374. && highspeed_hubs != 0)
  2375. check_highspeed (hub, udev, port1);
  2376. /* Store the parent's children[] pointer. At this point
  2377. * udev becomes globally accessible, although presumably
  2378. * no one will look at it until hdev is unlocked.
  2379. */
  2380. status = 0;
  2381. /* We mustn't add new devices if the parent hub has
  2382. * been disconnected; we would race with the
  2383. * recursively_mark_NOTATTACHED() routine.
  2384. */
  2385. spin_lock_irq(&device_state_lock);
  2386. if (hdev->state == USB_STATE_NOTATTACHED)
  2387. status = -ENOTCONN;
  2388. else
  2389. hdev->children[port1-1] = udev;
  2390. spin_unlock_irq(&device_state_lock);
  2391. /* Run it through the hoops (find a driver, etc) */
  2392. if (!status) {
  2393. status = usb_new_device(udev);
  2394. if (status) {
  2395. spin_lock_irq(&device_state_lock);
  2396. hdev->children[port1-1] = NULL;
  2397. spin_unlock_irq(&device_state_lock);
  2398. }
  2399. }
  2400. if (status)
  2401. goto loop_disable;
  2402. status = hub_power_remaining(hub);
  2403. if (status)
  2404. dev_dbg(hub_dev, "%dmA power budget left\n", status);
  2405. return;
  2406. loop_disable:
  2407. hub_port_disable(hub, port1, 1);
  2408. loop:
  2409. usb_ep0_reinit(udev);
  2410. release_address(udev);
  2411. usb_put_dev(udev);
  2412. if ((status == -ENOTCONN) || (status == -ENOTSUPP))
  2413. break;
  2414. }
  2415. dev_err(hub_dev, "unable to enumerate USB device on port %d\n", port1);
  2416. done:
  2417. hub_port_disable(hub, port1, 1);
  2418. if (hcd->driver->relinquish_port && !hub->hdev->parent)
  2419. hcd->driver->relinquish_port(hcd, port1);
  2420. }
  2421. static void hub_events(void)
  2422. {
  2423. struct list_head *tmp;
  2424. struct usb_device *hdev;
  2425. struct usb_interface *intf;
  2426. struct usb_hub *hub;
  2427. struct device *hub_dev;
  2428. u16 hubstatus;
  2429. u16 hubchange;
  2430. u16 portstatus;
  2431. u16 portchange;
  2432. int i, ret;
  2433. int connect_change;
  2434. /*
  2435. * We restart the list every time to avoid a deadlock with
  2436. * deleting hubs downstream from this one. This should be
  2437. * safe since we delete the hub from the event list.
  2438. * Not the most efficient, but avoids deadlocks.
  2439. */
  2440. while (1) {
  2441. /* Grab the first entry at the beginning of the list */
  2442. spin_lock_irq(&hub_event_lock);
  2443. if (list_empty(&hub_event_list)) {
  2444. spin_unlock_irq(&hub_event_lock);
  2445. break;
  2446. }
  2447. tmp = hub_event_list.next;
  2448. list_del_init(tmp);
  2449. hub = list_entry(tmp, struct usb_hub, event_list);
  2450. kref_get(&hub->kref);
  2451. spin_unlock_irq(&hub_event_lock);
  2452. hdev = hub->hdev;
  2453. hub_dev = hub->intfdev;
  2454. intf = to_usb_interface(hub_dev);
  2455. dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
  2456. hdev->state, hub->descriptor
  2457. ? hub->descriptor->bNbrPorts
  2458. : 0,
  2459. /* NOTE: expects max 15 ports... */
  2460. (u16) hub->change_bits[0],
  2461. (u16) hub->event_bits[0]);
  2462. /* Lock the device, then check to see if we were
  2463. * disconnected while waiting for the lock to succeed. */
  2464. usb_lock_device(hdev);
  2465. if (unlikely(hub->disconnected))
  2466. goto loop;
  2467. /* If the hub has died, clean up after it */
  2468. if (hdev->state == USB_STATE_NOTATTACHED) {
  2469. hub->error = -ENODEV;
  2470. hub_stop(hub);
  2471. goto loop;
  2472. }
  2473. /* Autoresume */
  2474. ret = usb_autopm_get_interface(intf);
  2475. if (ret) {
  2476. dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
  2477. goto loop;
  2478. }
  2479. /* If this is an inactive hub, do nothing */
  2480. if (hub->quiescing)
  2481. goto loop_autopm;
  2482. if (hub->error) {
  2483. dev_dbg (hub_dev, "resetting for error %d\n",
  2484. hub->error);
  2485. ret = usb_reset_composite_device(hdev, intf);
  2486. if (ret) {
  2487. dev_dbg (hub_dev,
  2488. "error resetting hub: %d\n", ret);
  2489. goto loop_autopm;
  2490. }
  2491. hub->nerrors = 0;
  2492. hub->error = 0;
  2493. }
  2494. /* deal with port status changes */
  2495. for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
  2496. if (test_bit(i, hub->busy_bits))
  2497. continue;
  2498. connect_change = test_bit(i, hub->change_bits);
  2499. if (!test_and_clear_bit(i, hub->event_bits) &&
  2500. !connect_change && !hub->activating)
  2501. continue;
  2502. ret = hub_port_status(hub, i,
  2503. &portstatus, &portchange);
  2504. if (ret < 0)
  2505. continue;
  2506. if (hub->activating && !hdev->children[i-1] &&
  2507. (portstatus &
  2508. USB_PORT_STAT_CONNECTION))
  2509. connect_change = 1;
  2510. if (portchange & USB_PORT_STAT_C_CONNECTION) {
  2511. clear_port_feature(hdev, i,
  2512. USB_PORT_FEAT_C_CONNECTION);
  2513. connect_change = 1;
  2514. }
  2515. if (portchange & USB_PORT_STAT_C_ENABLE) {
  2516. if (!connect_change)
  2517. dev_dbg (hub_dev,
  2518. "port %d enable change, "
  2519. "status %08x\n",
  2520. i, portstatus);
  2521. clear_port_feature(hdev, i,
  2522. USB_PORT_FEAT_C_ENABLE);
  2523. /*
  2524. * EM interference sometimes causes badly
  2525. * shielded USB devices to be shutdown by
  2526. * the hub, this hack enables them again.
  2527. * Works at least with mouse driver.
  2528. */
  2529. if (!(portstatus & USB_PORT_STAT_ENABLE)
  2530. && !connect_change
  2531. && hdev->children[i-1]) {
  2532. dev_err (hub_dev,
  2533. "port %i "
  2534. "disabled by hub (EMI?), "
  2535. "re-enabling...\n",
  2536. i);
  2537. connect_change = 1;
  2538. }
  2539. }
  2540. if (portchange & USB_PORT_STAT_C_SUSPEND) {
  2541. clear_port_feature(hdev, i,
  2542. USB_PORT_FEAT_C_SUSPEND);
  2543. if (hdev->children[i-1]) {
  2544. ret = remote_wakeup(hdev->
  2545. children[i-1]);
  2546. if (ret < 0)
  2547. connect_change = 1;
  2548. } else {
  2549. ret = -ENODEV;
  2550. hub_port_disable(hub, i, 1);
  2551. }
  2552. dev_dbg (hub_dev,
  2553. "resume on port %d, status %d\n",
  2554. i, ret);
  2555. }
  2556. if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
  2557. dev_err (hub_dev,
  2558. "over-current change on port %d\n",
  2559. i);
  2560. clear_port_feature(hdev, i,
  2561. USB_PORT_FEAT_C_OVER_CURRENT);
  2562. hub_power_on(hub);
  2563. }
  2564. if (portchange & USB_PORT_STAT_C_RESET) {
  2565. dev_dbg (hub_dev,
  2566. "reset change on port %d\n",
  2567. i);
  2568. clear_port_feature(hdev, i,
  2569. USB_PORT_FEAT_C_RESET);
  2570. }
  2571. if (connect_change)
  2572. hub_port_connect_change(hub, i,
  2573. portstatus, portchange);
  2574. } /* end for i */
  2575. /* deal with hub status changes */
  2576. if (test_and_clear_bit(0, hub->event_bits) == 0)
  2577. ; /* do nothing */
  2578. else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
  2579. dev_err (hub_dev, "get_hub_status failed\n");
  2580. else {
  2581. if (hubchange & HUB_CHANGE_LOCAL_POWER) {
  2582. dev_dbg (hub_dev, "power change\n");
  2583. clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
  2584. if (hubstatus & HUB_STATUS_LOCAL_POWER)
  2585. /* FIXME: Is this always true? */
  2586. hub->limited_power = 1;
  2587. else
  2588. hub->limited_power = 0;
  2589. }
  2590. if (hubchange & HUB_CHANGE_OVERCURRENT) {
  2591. dev_dbg (hub_dev, "overcurrent change\n");
  2592. msleep(500); /* Cool down */
  2593. clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
  2594. hub_power_on(hub);
  2595. }
  2596. }
  2597. hub->activating = 0;
  2598. loop_autopm:
  2599. /* Allow autosuspend if we're not going to run again */
  2600. if (list_empty(&hub->event_list))
  2601. usb_autopm_enable(intf);
  2602. loop:
  2603. usb_unlock_device(hdev);
  2604. kref_put(&hub->kref, hub_release);
  2605. } /* end while (1) */
  2606. }
  2607. static int hub_thread(void *__unused)
  2608. {
  2609. /* khubd needs to be freezable to avoid intefering with USB-PERSIST
  2610. * port handover. Otherwise it might see that a full-speed device
  2611. * was gone before the EHCI controller had handed its port over to
  2612. * the companion full-speed controller.
  2613. */
  2614. set_freezable();
  2615. do {
  2616. hub_events();
  2617. wait_event_freezable(khubd_wait,
  2618. !list_empty(&hub_event_list) ||
  2619. kthread_should_stop());
  2620. } while (!kthread_should_stop() || !list_empty(&hub_event_list));
  2621. pr_debug("%s: khubd exiting\n", usbcore_name);
  2622. return 0;
  2623. }
  2624. static struct usb_device_id hub_id_table [] = {
  2625. { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
  2626. .bDeviceClass = USB_CLASS_HUB},
  2627. { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
  2628. .bInterfaceClass = USB_CLASS_HUB},
  2629. { } /* Terminating entry */
  2630. };
  2631. MODULE_DEVICE_TABLE (usb, hub_id_table);
  2632. static struct usb_driver hub_driver = {
  2633. .name = "hub",
  2634. .probe = hub_probe,
  2635. .disconnect = hub_disconnect,
  2636. .suspend = hub_suspend,
  2637. .resume = hub_resume,
  2638. .reset_resume = hub_reset_resume,
  2639. .pre_reset = hub_pre_reset,
  2640. .post_reset = hub_post_reset,
  2641. .ioctl = hub_ioctl,
  2642. .id_table = hub_id_table,
  2643. .supports_autosuspend = 1,
  2644. };
  2645. int usb_hub_init(void)
  2646. {
  2647. if (usb_register(&hub_driver) < 0) {
  2648. printk(KERN_ERR "%s: can't register hub driver\n",
  2649. usbcore_name);
  2650. return -1;
  2651. }
  2652. khubd_task = kthread_run(hub_thread, NULL, "khubd");
  2653. if (!IS_ERR(khubd_task))
  2654. return 0;
  2655. /* Fall through if kernel_thread failed */
  2656. usb_deregister(&hub_driver);
  2657. printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
  2658. return -1;
  2659. }
  2660. void usb_hub_cleanup(void)
  2661. {
  2662. kthread_stop(khubd_task);
  2663. /*
  2664. * Hub resources are freed for us by usb_deregister. It calls
  2665. * usb_driver_purge on every device which in turn calls that
  2666. * devices disconnect function if it is using this driver.
  2667. * The hub_disconnect function takes care of releasing the
  2668. * individual hub resources. -greg
  2669. */
  2670. usb_deregister(&hub_driver);
  2671. } /* usb_hub_cleanup() */
  2672. static int descriptors_changed(struct usb_device *udev,
  2673. struct usb_device_descriptor *old_device_descriptor)
  2674. {
  2675. int changed = 0;
  2676. unsigned index;
  2677. unsigned serial_len = 0;
  2678. unsigned len;
  2679. unsigned old_length;
  2680. int length;
  2681. char *buf;
  2682. if (memcmp(&udev->descriptor, old_device_descriptor,
  2683. sizeof(*old_device_descriptor)) != 0)
  2684. return 1;
  2685. /* Since the idVendor, idProduct, and bcdDevice values in the
  2686. * device descriptor haven't changed, we will assume the
  2687. * Manufacturer and Product strings haven't changed either.
  2688. * But the SerialNumber string could be different (e.g., a
  2689. * different flash card of the same brand).
  2690. */
  2691. if (udev->serial)
  2692. serial_len = strlen(udev->serial) + 1;
  2693. len = serial_len;
  2694. for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
  2695. old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
  2696. len = max(len, old_length);
  2697. }
  2698. buf = kmalloc(len, GFP_NOIO);
  2699. if (buf == NULL) {
  2700. dev_err(&udev->dev, "no mem to re-read configs after reset\n");
  2701. /* assume the worst */
  2702. return 1;
  2703. }
  2704. for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
  2705. old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
  2706. length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
  2707. old_length);
  2708. if (length != old_length) {
  2709. dev_dbg(&udev->dev, "config index %d, error %d\n",
  2710. index, length);
  2711. changed = 1;
  2712. break;
  2713. }
  2714. if (memcmp (buf, udev->rawdescriptors[index], old_length)
  2715. != 0) {
  2716. dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
  2717. index,
  2718. ((struct usb_config_descriptor *) buf)->
  2719. bConfigurationValue);
  2720. changed = 1;
  2721. break;
  2722. }
  2723. }
  2724. if (!changed && serial_len) {
  2725. length = usb_string(udev, udev->descriptor.iSerialNumber,
  2726. buf, serial_len);
  2727. if (length + 1 != serial_len) {
  2728. dev_dbg(&udev->dev, "serial string error %d\n",
  2729. length);
  2730. changed = 1;
  2731. } else if (memcmp(buf, udev->serial, length) != 0) {
  2732. dev_dbg(&udev->dev, "serial string changed\n");
  2733. changed = 1;
  2734. }
  2735. }
  2736. kfree(buf);
  2737. return changed;
  2738. }
  2739. /**
  2740. * usb_reset_device - perform a USB port reset to reinitialize a device
  2741. * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
  2742. *
  2743. * WARNING - don't use this routine to reset a composite device
  2744. * (one with multiple interfaces owned by separate drivers)!
  2745. * Use usb_reset_composite_device() instead.
  2746. *
  2747. * Do a port reset, reassign the device's address, and establish its
  2748. * former operating configuration. If the reset fails, or the device's
  2749. * descriptors change from their values before the reset, or the original
  2750. * configuration and altsettings cannot be restored, a flag will be set
  2751. * telling khubd to pretend the device has been disconnected and then
  2752. * re-connected. All drivers will be unbound, and the device will be
  2753. * re-enumerated and probed all over again.
  2754. *
  2755. * Returns 0 if the reset succeeded, -ENODEV if the device has been
  2756. * flagged for logical disconnection, or some other negative error code
  2757. * if the reset wasn't even attempted.
  2758. *
  2759. * The caller must own the device lock. For example, it's safe to use
  2760. * this from a driver probe() routine after downloading new firmware.
  2761. * For calls that might not occur during probe(), drivers should lock
  2762. * the device using usb_lock_device_for_reset().
  2763. *
  2764. * Locking exception: This routine may also be called from within an
  2765. * autoresume handler. Such usage won't conflict with other tasks
  2766. * holding the device lock because these tasks should always call
  2767. * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
  2768. */
  2769. int usb_reset_device(struct usb_device *udev)
  2770. {
  2771. struct usb_device *parent_hdev = udev->parent;
  2772. struct usb_hub *parent_hub;
  2773. struct usb_device_descriptor descriptor = udev->descriptor;
  2774. int i, ret = 0;
  2775. int port1 = udev->portnum;
  2776. if (udev->state == USB_STATE_NOTATTACHED ||
  2777. udev->state == USB_STATE_SUSPENDED) {
  2778. dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
  2779. udev->state);
  2780. return -EINVAL;
  2781. }
  2782. if (!parent_hdev) {
  2783. /* this requires hcd-specific logic; see OHCI hc_restart() */
  2784. dev_dbg(&udev->dev, "%s for root hub!\n", __func__);
  2785. return -EISDIR;
  2786. }
  2787. parent_hub = hdev_to_hub(parent_hdev);
  2788. set_bit(port1, parent_hub->busy_bits);
  2789. for (i = 0; i < SET_CONFIG_TRIES; ++i) {
  2790. /* ep0 maxpacket size may change; let the HCD know about it.
  2791. * Other endpoints will be handled by re-enumeration. */
  2792. usb_ep0_reinit(udev);
  2793. ret = hub_port_init(parent_hub, udev, port1, i);
  2794. if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
  2795. break;
  2796. }
  2797. clear_bit(port1, parent_hub->busy_bits);
  2798. if (ret < 0)
  2799. goto re_enumerate;
  2800. /* Device might have changed firmware (DFU or similar) */
  2801. if (descriptors_changed(udev, &descriptor)) {
  2802. dev_info(&udev->dev, "device firmware changed\n");
  2803. udev->descriptor = descriptor; /* for disconnect() calls */
  2804. goto re_enumerate;
  2805. }
  2806. if (!udev->actconfig)
  2807. goto done;
  2808. ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  2809. USB_REQ_SET_CONFIGURATION, 0,
  2810. udev->actconfig->desc.bConfigurationValue, 0,
  2811. NULL, 0, USB_CTRL_SET_TIMEOUT);
  2812. if (ret < 0) {
  2813. dev_err(&udev->dev,
  2814. "can't restore configuration #%d (error=%d)\n",
  2815. udev->actconfig->desc.bConfigurationValue, ret);
  2816. goto re_enumerate;
  2817. }
  2818. usb_set_device_state(udev, USB_STATE_CONFIGURED);
  2819. for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
  2820. struct usb_interface *intf = udev->actconfig->interface[i];
  2821. struct usb_interface_descriptor *desc;
  2822. /* set_interface resets host side toggle even
  2823. * for altsetting zero. the interface may have no driver.
  2824. */
  2825. desc = &intf->cur_altsetting->desc;
  2826. ret = usb_set_interface(udev, desc->bInterfaceNumber,
  2827. desc->bAlternateSetting);
  2828. if (ret < 0) {
  2829. dev_err(&udev->dev, "failed to restore interface %d "
  2830. "altsetting %d (error=%d)\n",
  2831. desc->bInterfaceNumber,
  2832. desc->bAlternateSetting,
  2833. ret);
  2834. goto re_enumerate;
  2835. }
  2836. }
  2837. done:
  2838. return 0;
  2839. re_enumerate:
  2840. hub_port_logical_disconnect(parent_hub, port1);
  2841. return -ENODEV;
  2842. }
  2843. EXPORT_SYMBOL_GPL(usb_reset_device);
  2844. /**
  2845. * usb_reset_composite_device - warn interface drivers and perform a USB port reset
  2846. * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
  2847. * @iface: interface bound to the driver making the request (optional)
  2848. *
  2849. * Warns all drivers bound to registered interfaces (using their pre_reset
  2850. * method), performs the port reset, and then lets the drivers know that
  2851. * the reset is over (using their post_reset method).
  2852. *
  2853. * Return value is the same as for usb_reset_device().
  2854. *
  2855. * The caller must own the device lock. For example, it's safe to use
  2856. * this from a driver probe() routine after downloading new firmware.
  2857. * For calls that might not occur during probe(), drivers should lock
  2858. * the device using usb_lock_device_for_reset().
  2859. */
  2860. int usb_reset_composite_device(struct usb_device *udev,
  2861. struct usb_interface *iface)
  2862. {
  2863. int ret;
  2864. int i;
  2865. struct usb_host_config *config = udev->actconfig;
  2866. if (udev->state == USB_STATE_NOTATTACHED ||
  2867. udev->state == USB_STATE_SUSPENDED) {
  2868. dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
  2869. udev->state);
  2870. return -EINVAL;
  2871. }
  2872. /* Prevent autosuspend during the reset */
  2873. usb_autoresume_device(udev);
  2874. if (iface && iface->condition != USB_INTERFACE_BINDING)
  2875. iface = NULL;
  2876. if (config) {
  2877. for (i = 0; i < config->desc.bNumInterfaces; ++i) {
  2878. struct usb_interface *cintf = config->interface[i];
  2879. struct usb_driver *drv;
  2880. if (cintf->dev.driver) {
  2881. drv = to_usb_driver(cintf->dev.driver);
  2882. if (drv->pre_reset)
  2883. (drv->pre_reset)(cintf);
  2884. /* FIXME: Unbind if pre_reset returns an error or isn't defined */
  2885. }
  2886. }
  2887. }
  2888. ret = usb_reset_device(udev);
  2889. if (config) {
  2890. for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
  2891. struct usb_interface *cintf = config->interface[i];
  2892. struct usb_driver *drv;
  2893. if (cintf->dev.driver) {
  2894. drv = to_usb_driver(cintf->dev.driver);
  2895. if (drv->post_reset)
  2896. (drv->post_reset)(cintf);
  2897. /* FIXME: Unbind if post_reset returns an error or isn't defined */
  2898. }
  2899. }
  2900. }
  2901. usb_autosuspend_device(udev);
  2902. return ret;
  2903. }
  2904. EXPORT_SYMBOL_GPL(usb_reset_composite_device);