hub.c 80 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/smp_lock.h>
  19. #include <linux/ioctl.h>
  20. #include <linux/usb.h>
  21. #include <linux/usbdevice_fs.h>
  22. #include <linux/kthread.h>
  23. #include <linux/mutex.h>
  24. #include <asm/semaphore.h>
  25. #include <asm/uaccess.h>
  26. #include <asm/byteorder.h>
  27. #include "usb.h"
  28. #include "hcd.h"
  29. #include "hub.h"
  30. /* Protect struct usb_device->state and ->children members
  31. * Note: Both are also protected by ->dev.sem, except that ->state can
  32. * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
  33. static DEFINE_SPINLOCK(device_state_lock);
  34. /* khubd's worklist and its lock */
  35. static DEFINE_SPINLOCK(hub_event_lock);
  36. static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
  37. /* Wakes up khubd */
  38. static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
  39. static struct task_struct *khubd_task;
  40. /* cycle leds on hubs that aren't blinking for attention */
  41. static int blinkenlights = 0;
  42. module_param (blinkenlights, bool, S_IRUGO);
  43. MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
  44. /*
  45. * As of 2.6.10 we introduce a new USB device initialization scheme which
  46. * closely resembles the way Windows works. Hopefully it will be compatible
  47. * with a wider range of devices than the old scheme. However some previously
  48. * working devices may start giving rise to "device not accepting address"
  49. * errors; if that happens the user can try the old scheme by adjusting the
  50. * following module parameters.
  51. *
  52. * For maximum flexibility there are two boolean parameters to control the
  53. * hub driver's behavior. On the first initialization attempt, if the
  54. * "old_scheme_first" parameter is set then the old scheme will be used,
  55. * otherwise the new scheme is used. If that fails and "use_both_schemes"
  56. * is set, then the driver will make another attempt, using the other scheme.
  57. */
  58. static int old_scheme_first = 0;
  59. module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
  60. MODULE_PARM_DESC(old_scheme_first,
  61. "start with the old device initialization scheme");
  62. static int use_both_schemes = 1;
  63. module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
  64. MODULE_PARM_DESC(use_both_schemes,
  65. "try the other device initialization scheme if the "
  66. "first one fails");
  67. #ifdef DEBUG
  68. static inline char *portspeed (int portstatus)
  69. {
  70. if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
  71. return "480 Mb/s";
  72. else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
  73. return "1.5 Mb/s";
  74. else
  75. return "12 Mb/s";
  76. }
  77. #endif
  78. /* Note that hdev or one of its children must be locked! */
  79. static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
  80. {
  81. return usb_get_intfdata(hdev->actconfig->interface[0]);
  82. }
  83. /* USB 2.0 spec Section 11.24.4.5 */
  84. static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
  85. {
  86. int i, ret;
  87. for (i = 0; i < 3; i++) {
  88. ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
  89. USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
  90. USB_DT_HUB << 8, 0, data, size,
  91. USB_CTRL_GET_TIMEOUT);
  92. if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
  93. return ret;
  94. }
  95. return -EINVAL;
  96. }
  97. /*
  98. * USB 2.0 spec Section 11.24.2.1
  99. */
  100. static int clear_hub_feature(struct usb_device *hdev, int feature)
  101. {
  102. return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
  103. USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
  104. }
  105. /*
  106. * USB 2.0 spec Section 11.24.2.2
  107. */
  108. static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
  109. {
  110. return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
  111. USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
  112. NULL, 0, 1000);
  113. }
  114. /*
  115. * USB 2.0 spec Section 11.24.2.13
  116. */
  117. static int set_port_feature(struct usb_device *hdev, int port1, int feature)
  118. {
  119. return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
  120. USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
  121. NULL, 0, 1000);
  122. }
  123. /*
  124. * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
  125. * for info about using port indicators
  126. */
  127. static void set_port_led(
  128. struct usb_hub *hub,
  129. int port1,
  130. int selector
  131. )
  132. {
  133. int status = set_port_feature(hub->hdev, (selector << 8) | port1,
  134. USB_PORT_FEAT_INDICATOR);
  135. if (status < 0)
  136. dev_dbg (hub->intfdev,
  137. "port %d indicator %s status %d\n",
  138. port1,
  139. ({ char *s; switch (selector) {
  140. case HUB_LED_AMBER: s = "amber"; break;
  141. case HUB_LED_GREEN: s = "green"; break;
  142. case HUB_LED_OFF: s = "off"; break;
  143. case HUB_LED_AUTO: s = "auto"; break;
  144. default: s = "??"; break;
  145. }; s; }),
  146. status);
  147. }
  148. #define LED_CYCLE_PERIOD ((2*HZ)/3)
  149. static void led_work (void *__hub)
  150. {
  151. struct usb_hub *hub = __hub;
  152. struct usb_device *hdev = hub->hdev;
  153. unsigned i;
  154. unsigned changed = 0;
  155. int cursor = -1;
  156. if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
  157. return;
  158. for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
  159. unsigned selector, mode;
  160. /* 30%-50% duty cycle */
  161. switch (hub->indicator[i]) {
  162. /* cycle marker */
  163. case INDICATOR_CYCLE:
  164. cursor = i;
  165. selector = HUB_LED_AUTO;
  166. mode = INDICATOR_AUTO;
  167. break;
  168. /* blinking green = sw attention */
  169. case INDICATOR_GREEN_BLINK:
  170. selector = HUB_LED_GREEN;
  171. mode = INDICATOR_GREEN_BLINK_OFF;
  172. break;
  173. case INDICATOR_GREEN_BLINK_OFF:
  174. selector = HUB_LED_OFF;
  175. mode = INDICATOR_GREEN_BLINK;
  176. break;
  177. /* blinking amber = hw attention */
  178. case INDICATOR_AMBER_BLINK:
  179. selector = HUB_LED_AMBER;
  180. mode = INDICATOR_AMBER_BLINK_OFF;
  181. break;
  182. case INDICATOR_AMBER_BLINK_OFF:
  183. selector = HUB_LED_OFF;
  184. mode = INDICATOR_AMBER_BLINK;
  185. break;
  186. /* blink green/amber = reserved */
  187. case INDICATOR_ALT_BLINK:
  188. selector = HUB_LED_GREEN;
  189. mode = INDICATOR_ALT_BLINK_OFF;
  190. break;
  191. case INDICATOR_ALT_BLINK_OFF:
  192. selector = HUB_LED_AMBER;
  193. mode = INDICATOR_ALT_BLINK;
  194. break;
  195. default:
  196. continue;
  197. }
  198. if (selector != HUB_LED_AUTO)
  199. changed = 1;
  200. set_port_led(hub, i + 1, selector);
  201. hub->indicator[i] = mode;
  202. }
  203. if (!changed && blinkenlights) {
  204. cursor++;
  205. cursor %= hub->descriptor->bNbrPorts;
  206. set_port_led(hub, cursor + 1, HUB_LED_GREEN);
  207. hub->indicator[cursor] = INDICATOR_CYCLE;
  208. changed++;
  209. }
  210. if (changed)
  211. schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
  212. }
  213. /* use a short timeout for hub/port status fetches */
  214. #define USB_STS_TIMEOUT 1000
  215. #define USB_STS_RETRIES 5
  216. /*
  217. * USB 2.0 spec Section 11.24.2.6
  218. */
  219. static int get_hub_status(struct usb_device *hdev,
  220. struct usb_hub_status *data)
  221. {
  222. int i, status = -ETIMEDOUT;
  223. for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
  224. status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
  225. USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
  226. data, sizeof(*data), USB_STS_TIMEOUT);
  227. }
  228. return status;
  229. }
  230. /*
  231. * USB 2.0 spec Section 11.24.2.7
  232. */
  233. static int get_port_status(struct usb_device *hdev, int port1,
  234. struct usb_port_status *data)
  235. {
  236. int i, status = -ETIMEDOUT;
  237. for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
  238. status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
  239. USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
  240. data, sizeof(*data), USB_STS_TIMEOUT);
  241. }
  242. return status;
  243. }
  244. static void kick_khubd(struct usb_hub *hub)
  245. {
  246. unsigned long flags;
  247. spin_lock_irqsave(&hub_event_lock, flags);
  248. if (list_empty(&hub->event_list)) {
  249. list_add_tail(&hub->event_list, &hub_event_list);
  250. wake_up(&khubd_wait);
  251. }
  252. spin_unlock_irqrestore(&hub_event_lock, flags);
  253. }
  254. void usb_kick_khubd(struct usb_device *hdev)
  255. {
  256. kick_khubd(hdev_to_hub(hdev));
  257. }
  258. /* completion function, fires on port status changes and various faults */
  259. static void hub_irq(struct urb *urb, struct pt_regs *regs)
  260. {
  261. struct usb_hub *hub = (struct usb_hub *)urb->context;
  262. int status;
  263. int i;
  264. unsigned long bits;
  265. switch (urb->status) {
  266. case -ENOENT: /* synchronous unlink */
  267. case -ECONNRESET: /* async unlink */
  268. case -ESHUTDOWN: /* hardware going away */
  269. return;
  270. default: /* presumably an error */
  271. /* Cause a hub reset after 10 consecutive errors */
  272. dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
  273. if ((++hub->nerrors < 10) || hub->error)
  274. goto resubmit;
  275. hub->error = urb->status;
  276. /* FALL THROUGH */
  277. /* let khubd handle things */
  278. case 0: /* we got data: port status changed */
  279. bits = 0;
  280. for (i = 0; i < urb->actual_length; ++i)
  281. bits |= ((unsigned long) ((*hub->buffer)[i]))
  282. << (i*8);
  283. hub->event_bits[0] = bits;
  284. break;
  285. }
  286. hub->nerrors = 0;
  287. /* Something happened, let khubd figure it out */
  288. kick_khubd(hub);
  289. resubmit:
  290. if (hub->quiescing)
  291. return;
  292. if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
  293. && status != -ENODEV && status != -EPERM)
  294. dev_err (hub->intfdev, "resubmit --> %d\n", status);
  295. }
  296. /* USB 2.0 spec Section 11.24.2.3 */
  297. static inline int
  298. hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
  299. {
  300. return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
  301. HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
  302. tt, NULL, 0, 1000);
  303. }
  304. /*
  305. * enumeration blocks khubd for a long time. we use keventd instead, since
  306. * long blocking there is the exception, not the rule. accordingly, HCDs
  307. * talking to TTs must queue control transfers (not just bulk and iso), so
  308. * both can talk to the same hub concurrently.
  309. */
  310. static void hub_tt_kevent (void *arg)
  311. {
  312. struct usb_hub *hub = arg;
  313. unsigned long flags;
  314. spin_lock_irqsave (&hub->tt.lock, flags);
  315. while (!list_empty (&hub->tt.clear_list)) {
  316. struct list_head *temp;
  317. struct usb_tt_clear *clear;
  318. struct usb_device *hdev = hub->hdev;
  319. int status;
  320. temp = hub->tt.clear_list.next;
  321. clear = list_entry (temp, struct usb_tt_clear, clear_list);
  322. list_del (&clear->clear_list);
  323. /* drop lock so HCD can concurrently report other TT errors */
  324. spin_unlock_irqrestore (&hub->tt.lock, flags);
  325. status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
  326. spin_lock_irqsave (&hub->tt.lock, flags);
  327. if (status)
  328. dev_err (&hdev->dev,
  329. "clear tt %d (%04x) error %d\n",
  330. clear->tt, clear->devinfo, status);
  331. kfree(clear);
  332. }
  333. spin_unlock_irqrestore (&hub->tt.lock, flags);
  334. }
  335. /**
  336. * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
  337. * @udev: the device whose split transaction failed
  338. * @pipe: identifies the endpoint of the failed transaction
  339. *
  340. * High speed HCDs use this to tell the hub driver that some split control or
  341. * bulk transaction failed in a way that requires clearing internal state of
  342. * a transaction translator. This is normally detected (and reported) from
  343. * interrupt context.
  344. *
  345. * It may not be possible for that hub to handle additional full (or low)
  346. * speed transactions until that state is fully cleared out.
  347. */
  348. void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
  349. {
  350. struct usb_tt *tt = udev->tt;
  351. unsigned long flags;
  352. struct usb_tt_clear *clear;
  353. /* we've got to cope with an arbitrary number of pending TT clears,
  354. * since each TT has "at least two" buffers that can need it (and
  355. * there can be many TTs per hub). even if they're uncommon.
  356. */
  357. if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == NULL) {
  358. dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
  359. /* FIXME recover somehow ... RESET_TT? */
  360. return;
  361. }
  362. /* info that CLEAR_TT_BUFFER needs */
  363. clear->tt = tt->multi ? udev->ttport : 1;
  364. clear->devinfo = usb_pipeendpoint (pipe);
  365. clear->devinfo |= udev->devnum << 4;
  366. clear->devinfo |= usb_pipecontrol (pipe)
  367. ? (USB_ENDPOINT_XFER_CONTROL << 11)
  368. : (USB_ENDPOINT_XFER_BULK << 11);
  369. if (usb_pipein (pipe))
  370. clear->devinfo |= 1 << 15;
  371. /* tell keventd to clear state for this TT */
  372. spin_lock_irqsave (&tt->lock, flags);
  373. list_add_tail (&clear->clear_list, &tt->clear_list);
  374. schedule_work (&tt->kevent);
  375. spin_unlock_irqrestore (&tt->lock, flags);
  376. }
  377. static void hub_power_on(struct usb_hub *hub)
  378. {
  379. int port1;
  380. unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
  381. u16 wHubCharacteristics =
  382. le16_to_cpu(hub->descriptor->wHubCharacteristics);
  383. /* Enable power on each port. Some hubs have reserved values
  384. * of LPSM (> 2) in their descriptors, even though they are
  385. * USB 2.0 hubs. Some hubs do not implement port-power switching
  386. * but only emulate it. In all cases, the ports won't work
  387. * unless we send these messages to the hub.
  388. */
  389. if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
  390. dev_dbg(hub->intfdev, "enabling power on all ports\n");
  391. else
  392. dev_dbg(hub->intfdev, "trying to enable port power on "
  393. "non-switchable hub\n");
  394. for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
  395. set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
  396. /* Wait at least 100 msec for power to become stable */
  397. msleep(max(pgood_delay, (unsigned) 100));
  398. }
  399. static inline void __hub_quiesce(struct usb_hub *hub)
  400. {
  401. /* (nonblocking) khubd and related activity won't re-trigger */
  402. hub->quiescing = 1;
  403. hub->activating = 0;
  404. hub->resume_root_hub = 0;
  405. }
  406. static void hub_quiesce(struct usb_hub *hub)
  407. {
  408. /* (blocking) stop khubd and related activity */
  409. __hub_quiesce(hub);
  410. usb_kill_urb(hub->urb);
  411. if (hub->has_indicators)
  412. cancel_delayed_work(&hub->leds);
  413. if (hub->has_indicators || hub->tt.hub)
  414. flush_scheduled_work();
  415. }
  416. static void hub_activate(struct usb_hub *hub)
  417. {
  418. int status;
  419. hub->quiescing = 0;
  420. hub->activating = 1;
  421. hub->resume_root_hub = 0;
  422. status = usb_submit_urb(hub->urb, GFP_NOIO);
  423. if (status < 0)
  424. dev_err(hub->intfdev, "activate --> %d\n", status);
  425. if (hub->has_indicators && blinkenlights)
  426. schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
  427. /* scan all ports ASAP */
  428. kick_khubd(hub);
  429. }
  430. static int hub_hub_status(struct usb_hub *hub,
  431. u16 *status, u16 *change)
  432. {
  433. int ret;
  434. ret = get_hub_status(hub->hdev, &hub->status->hub);
  435. if (ret < 0)
  436. dev_err (hub->intfdev,
  437. "%s failed (err = %d)\n", __FUNCTION__, ret);
  438. else {
  439. *status = le16_to_cpu(hub->status->hub.wHubStatus);
  440. *change = le16_to_cpu(hub->status->hub.wHubChange);
  441. ret = 0;
  442. }
  443. return ret;
  444. }
  445. static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
  446. {
  447. struct usb_device *hdev = hub->hdev;
  448. int ret;
  449. if (hdev->children[port1-1] && set_state) {
  450. usb_set_device_state(hdev->children[port1-1],
  451. USB_STATE_NOTATTACHED);
  452. }
  453. ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
  454. if (ret)
  455. dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
  456. port1, ret);
  457. return ret;
  458. }
  459. /* caller has locked the hub device */
  460. static void hub_pre_reset(struct usb_interface *intf)
  461. {
  462. struct usb_hub *hub = usb_get_intfdata(intf);
  463. struct usb_device *hdev = hub->hdev;
  464. int port1;
  465. for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
  466. if (hdev->children[port1 - 1]) {
  467. usb_disconnect(&hdev->children[port1 - 1]);
  468. if (hub->error == 0)
  469. hub_port_disable(hub, port1, 0);
  470. }
  471. }
  472. hub_quiesce(hub);
  473. }
  474. /* caller has locked the hub device */
  475. static void hub_post_reset(struct usb_interface *intf)
  476. {
  477. struct usb_hub *hub = usb_get_intfdata(intf);
  478. hub_activate(hub);
  479. hub_power_on(hub);
  480. }
  481. static int hub_configure(struct usb_hub *hub,
  482. struct usb_endpoint_descriptor *endpoint)
  483. {
  484. struct usb_device *hdev = hub->hdev;
  485. struct device *hub_dev = hub->intfdev;
  486. u16 hubstatus, hubchange;
  487. u16 wHubCharacteristics;
  488. unsigned int pipe;
  489. int maxp, ret;
  490. char *message;
  491. hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
  492. &hub->buffer_dma);
  493. if (!hub->buffer) {
  494. message = "can't allocate hub irq buffer";
  495. ret = -ENOMEM;
  496. goto fail;
  497. }
  498. hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
  499. if (!hub->status) {
  500. message = "can't kmalloc hub status buffer";
  501. ret = -ENOMEM;
  502. goto fail;
  503. }
  504. hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
  505. if (!hub->descriptor) {
  506. message = "can't kmalloc hub descriptor";
  507. ret = -ENOMEM;
  508. goto fail;
  509. }
  510. /* Request the entire hub descriptor.
  511. * hub->descriptor can handle USB_MAXCHILDREN ports,
  512. * but the hub can/will return fewer bytes here.
  513. */
  514. ret = get_hub_descriptor(hdev, hub->descriptor,
  515. sizeof(*hub->descriptor));
  516. if (ret < 0) {
  517. message = "can't read hub descriptor";
  518. goto fail;
  519. } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
  520. message = "hub has too many ports!";
  521. ret = -ENODEV;
  522. goto fail;
  523. }
  524. hdev->maxchild = hub->descriptor->bNbrPorts;
  525. dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
  526. (hdev->maxchild == 1) ? "" : "s");
  527. wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
  528. if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
  529. int i;
  530. char portstr [USB_MAXCHILDREN + 1];
  531. for (i = 0; i < hdev->maxchild; i++)
  532. portstr[i] = hub->descriptor->DeviceRemovable
  533. [((i + 1) / 8)] & (1 << ((i + 1) % 8))
  534. ? 'F' : 'R';
  535. portstr[hdev->maxchild] = 0;
  536. dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
  537. } else
  538. dev_dbg(hub_dev, "standalone hub\n");
  539. switch (wHubCharacteristics & HUB_CHAR_LPSM) {
  540. case 0x00:
  541. dev_dbg(hub_dev, "ganged power switching\n");
  542. break;
  543. case 0x01:
  544. dev_dbg(hub_dev, "individual port power switching\n");
  545. break;
  546. case 0x02:
  547. case 0x03:
  548. dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
  549. break;
  550. }
  551. switch (wHubCharacteristics & HUB_CHAR_OCPM) {
  552. case 0x00:
  553. dev_dbg(hub_dev, "global over-current protection\n");
  554. break;
  555. case 0x08:
  556. dev_dbg(hub_dev, "individual port over-current protection\n");
  557. break;
  558. case 0x10:
  559. case 0x18:
  560. dev_dbg(hub_dev, "no over-current protection\n");
  561. break;
  562. }
  563. spin_lock_init (&hub->tt.lock);
  564. INIT_LIST_HEAD (&hub->tt.clear_list);
  565. INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
  566. switch (hdev->descriptor.bDeviceProtocol) {
  567. case 0:
  568. break;
  569. case 1:
  570. dev_dbg(hub_dev, "Single TT\n");
  571. hub->tt.hub = hdev;
  572. break;
  573. case 2:
  574. ret = usb_set_interface(hdev, 0, 1);
  575. if (ret == 0) {
  576. dev_dbg(hub_dev, "TT per port\n");
  577. hub->tt.multi = 1;
  578. } else
  579. dev_err(hub_dev, "Using single TT (err %d)\n",
  580. ret);
  581. hub->tt.hub = hdev;
  582. break;
  583. default:
  584. dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
  585. hdev->descriptor.bDeviceProtocol);
  586. break;
  587. }
  588. /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
  589. switch (wHubCharacteristics & HUB_CHAR_TTTT) {
  590. case HUB_TTTT_8_BITS:
  591. if (hdev->descriptor.bDeviceProtocol != 0) {
  592. hub->tt.think_time = 666;
  593. dev_dbg(hub_dev, "TT requires at most %d "
  594. "FS bit times (%d ns)\n",
  595. 8, hub->tt.think_time);
  596. }
  597. break;
  598. case HUB_TTTT_16_BITS:
  599. hub->tt.think_time = 666 * 2;
  600. dev_dbg(hub_dev, "TT requires at most %d "
  601. "FS bit times (%d ns)\n",
  602. 16, hub->tt.think_time);
  603. break;
  604. case HUB_TTTT_24_BITS:
  605. hub->tt.think_time = 666 * 3;
  606. dev_dbg(hub_dev, "TT requires at most %d "
  607. "FS bit times (%d ns)\n",
  608. 24, hub->tt.think_time);
  609. break;
  610. case HUB_TTTT_32_BITS:
  611. hub->tt.think_time = 666 * 4;
  612. dev_dbg(hub_dev, "TT requires at most %d "
  613. "FS bit times (%d ns)\n",
  614. 32, hub->tt.think_time);
  615. break;
  616. }
  617. /* probe() zeroes hub->indicator[] */
  618. if (wHubCharacteristics & HUB_CHAR_PORTIND) {
  619. hub->has_indicators = 1;
  620. dev_dbg(hub_dev, "Port indicators are supported\n");
  621. }
  622. dev_dbg(hub_dev, "power on to power good time: %dms\n",
  623. hub->descriptor->bPwrOn2PwrGood * 2);
  624. /* power budgeting mostly matters with bus-powered hubs,
  625. * and battery-powered root hubs (may provide just 8 mA).
  626. */
  627. ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
  628. if (ret < 2) {
  629. message = "can't get hub status";
  630. goto fail;
  631. }
  632. le16_to_cpus(&hubstatus);
  633. if (hdev == hdev->bus->root_hub) {
  634. if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
  635. hub->mA_per_port = 500;
  636. else {
  637. hub->mA_per_port = hdev->bus_mA;
  638. hub->limited_power = 1;
  639. }
  640. } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
  641. dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
  642. hub->descriptor->bHubContrCurrent);
  643. hub->limited_power = 1;
  644. if (hdev->maxchild > 0) {
  645. int remaining = hdev->bus_mA -
  646. hub->descriptor->bHubContrCurrent;
  647. if (remaining < hdev->maxchild * 100)
  648. dev_warn(hub_dev,
  649. "insufficient power available "
  650. "to use all downstream ports\n");
  651. hub->mA_per_port = 100; /* 7.2.1.1 */
  652. }
  653. } else { /* Self-powered external hub */
  654. /* FIXME: What about battery-powered external hubs that
  655. * provide less current per port? */
  656. hub->mA_per_port = 500;
  657. }
  658. if (hub->mA_per_port < 500)
  659. dev_dbg(hub_dev, "%umA bus power budget for each child\n",
  660. hub->mA_per_port);
  661. ret = hub_hub_status(hub, &hubstatus, &hubchange);
  662. if (ret < 0) {
  663. message = "can't get hub status";
  664. goto fail;
  665. }
  666. /* local power status reports aren't always correct */
  667. if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
  668. dev_dbg(hub_dev, "local power source is %s\n",
  669. (hubstatus & HUB_STATUS_LOCAL_POWER)
  670. ? "lost (inactive)" : "good");
  671. if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
  672. dev_dbg(hub_dev, "%sover-current condition exists\n",
  673. (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
  674. /* set up the interrupt endpoint */
  675. pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
  676. maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
  677. if (maxp > sizeof(*hub->buffer))
  678. maxp = sizeof(*hub->buffer);
  679. hub->urb = usb_alloc_urb(0, GFP_KERNEL);
  680. if (!hub->urb) {
  681. message = "couldn't allocate interrupt urb";
  682. ret = -ENOMEM;
  683. goto fail;
  684. }
  685. usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
  686. hub, endpoint->bInterval);
  687. hub->urb->transfer_dma = hub->buffer_dma;
  688. hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
  689. /* maybe cycle the hub leds */
  690. if (hub->has_indicators && blinkenlights)
  691. hub->indicator [0] = INDICATOR_CYCLE;
  692. hub_power_on(hub);
  693. hub_activate(hub);
  694. return 0;
  695. fail:
  696. dev_err (hub_dev, "config failed, %s (err %d)\n",
  697. message, ret);
  698. /* hub_disconnect() frees urb and descriptor */
  699. return ret;
  700. }
  701. static unsigned highspeed_hubs;
  702. static void hub_disconnect(struct usb_interface *intf)
  703. {
  704. struct usb_hub *hub = usb_get_intfdata (intf);
  705. struct usb_device *hdev;
  706. /* Disconnect all children and quiesce the hub */
  707. hub->error = 0;
  708. hub_pre_reset(intf);
  709. usb_set_intfdata (intf, NULL);
  710. hdev = hub->hdev;
  711. if (hdev->speed == USB_SPEED_HIGH)
  712. highspeed_hubs--;
  713. usb_free_urb(hub->urb);
  714. hub->urb = NULL;
  715. spin_lock_irq(&hub_event_lock);
  716. list_del_init(&hub->event_list);
  717. spin_unlock_irq(&hub_event_lock);
  718. kfree(hub->descriptor);
  719. hub->descriptor = NULL;
  720. kfree(hub->status);
  721. hub->status = NULL;
  722. if (hub->buffer) {
  723. usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer,
  724. hub->buffer_dma);
  725. hub->buffer = NULL;
  726. }
  727. kfree(hub);
  728. }
  729. static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
  730. {
  731. struct usb_host_interface *desc;
  732. struct usb_endpoint_descriptor *endpoint;
  733. struct usb_device *hdev;
  734. struct usb_hub *hub;
  735. desc = intf->cur_altsetting;
  736. hdev = interface_to_usbdev(intf);
  737. #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
  738. if (hdev->parent) {
  739. dev_warn(&intf->dev, "ignoring external hub\n");
  740. return -ENODEV;
  741. }
  742. #endif
  743. /* Some hubs have a subclass of 1, which AFAICT according to the */
  744. /* specs is not defined, but it works */
  745. if ((desc->desc.bInterfaceSubClass != 0) &&
  746. (desc->desc.bInterfaceSubClass != 1)) {
  747. descriptor_error:
  748. dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
  749. return -EIO;
  750. }
  751. /* Multiple endpoints? What kind of mutant ninja-hub is this? */
  752. if (desc->desc.bNumEndpoints != 1)
  753. goto descriptor_error;
  754. endpoint = &desc->endpoint[0].desc;
  755. /* If it's not an interrupt in endpoint, we'd better punt! */
  756. if (!usb_endpoint_is_int_in(endpoint))
  757. goto descriptor_error;
  758. /* We found a hub */
  759. dev_info (&intf->dev, "USB hub found\n");
  760. hub = kzalloc(sizeof(*hub), GFP_KERNEL);
  761. if (!hub) {
  762. dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
  763. return -ENOMEM;
  764. }
  765. INIT_LIST_HEAD(&hub->event_list);
  766. hub->intfdev = &intf->dev;
  767. hub->hdev = hdev;
  768. INIT_WORK(&hub->leds, led_work, hub);
  769. usb_set_intfdata (intf, hub);
  770. if (hdev->speed == USB_SPEED_HIGH)
  771. highspeed_hubs++;
  772. if (hub_configure(hub, endpoint) >= 0)
  773. return 0;
  774. hub_disconnect (intf);
  775. return -ENODEV;
  776. }
  777. static int
  778. hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
  779. {
  780. struct usb_device *hdev = interface_to_usbdev (intf);
  781. /* assert ifno == 0 (part of hub spec) */
  782. switch (code) {
  783. case USBDEVFS_HUB_PORTINFO: {
  784. struct usbdevfs_hub_portinfo *info = user_data;
  785. int i;
  786. spin_lock_irq(&device_state_lock);
  787. if (hdev->devnum <= 0)
  788. info->nports = 0;
  789. else {
  790. info->nports = hdev->maxchild;
  791. for (i = 0; i < info->nports; i++) {
  792. if (hdev->children[i] == NULL)
  793. info->port[i] = 0;
  794. else
  795. info->port[i] =
  796. hdev->children[i]->devnum;
  797. }
  798. }
  799. spin_unlock_irq(&device_state_lock);
  800. return info->nports + 1;
  801. }
  802. default:
  803. return -ENOSYS;
  804. }
  805. }
  806. /* grab device/port lock, returning index of that port (zero based).
  807. * protects the upstream link used by this device from concurrent
  808. * tree operations like suspend, resume, reset, and disconnect, which
  809. * apply to everything downstream of a given port.
  810. */
  811. static int locktree(struct usb_device *udev)
  812. {
  813. int t;
  814. struct usb_device *hdev;
  815. if (!udev)
  816. return -ENODEV;
  817. /* root hub is always the first lock in the series */
  818. hdev = udev->parent;
  819. if (!hdev) {
  820. usb_lock_device(udev);
  821. return 0;
  822. }
  823. /* on the path from root to us, lock everything from
  824. * top down, dropping parent locks when not needed
  825. */
  826. t = locktree(hdev);
  827. if (t < 0)
  828. return t;
  829. /* everything is fail-fast once disconnect
  830. * processing starts
  831. */
  832. if (udev->state == USB_STATE_NOTATTACHED) {
  833. usb_unlock_device(hdev);
  834. return -ENODEV;
  835. }
  836. /* when everyone grabs locks top->bottom,
  837. * non-overlapping work may be concurrent
  838. */
  839. usb_lock_device(udev);
  840. usb_unlock_device(hdev);
  841. return udev->portnum;
  842. }
  843. static void recursively_mark_NOTATTACHED(struct usb_device *udev)
  844. {
  845. int i;
  846. for (i = 0; i < udev->maxchild; ++i) {
  847. if (udev->children[i])
  848. recursively_mark_NOTATTACHED(udev->children[i]);
  849. }
  850. udev->state = USB_STATE_NOTATTACHED;
  851. }
  852. /**
  853. * usb_set_device_state - change a device's current state (usbcore, hcds)
  854. * @udev: pointer to device whose state should be changed
  855. * @new_state: new state value to be stored
  856. *
  857. * udev->state is _not_ fully protected by the device lock. Although
  858. * most transitions are made only while holding the lock, the state can
  859. * can change to USB_STATE_NOTATTACHED at almost any time. This
  860. * is so that devices can be marked as disconnected as soon as possible,
  861. * without having to wait for any semaphores to be released. As a result,
  862. * all changes to any device's state must be protected by the
  863. * device_state_lock spinlock.
  864. *
  865. * Once a device has been added to the device tree, all changes to its state
  866. * should be made using this routine. The state should _not_ be set directly.
  867. *
  868. * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
  869. * Otherwise udev->state is set to new_state, and if new_state is
  870. * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
  871. * to USB_STATE_NOTATTACHED.
  872. */
  873. void usb_set_device_state(struct usb_device *udev,
  874. enum usb_device_state new_state)
  875. {
  876. unsigned long flags;
  877. spin_lock_irqsave(&device_state_lock, flags);
  878. if (udev->state == USB_STATE_NOTATTACHED)
  879. ; /* do nothing */
  880. else if (new_state != USB_STATE_NOTATTACHED) {
  881. udev->state = new_state;
  882. /* root hub wakeup capabilities are managed out-of-band
  883. * and may involve silicon errata ... ignore them here.
  884. */
  885. if (udev->parent) {
  886. if (new_state == USB_STATE_CONFIGURED)
  887. device_init_wakeup(&udev->dev,
  888. (udev->actconfig->desc.bmAttributes
  889. & USB_CONFIG_ATT_WAKEUP));
  890. else if (new_state != USB_STATE_SUSPENDED)
  891. device_init_wakeup(&udev->dev, 0);
  892. }
  893. } else
  894. recursively_mark_NOTATTACHED(udev);
  895. spin_unlock_irqrestore(&device_state_lock, flags);
  896. }
  897. #ifdef CONFIG_PM
  898. /**
  899. * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
  900. * @rhdev: struct usb_device for the root hub
  901. *
  902. * The USB host controller driver calls this function when its root hub
  903. * is resumed and Vbus power has been interrupted or the controller
  904. * has been reset. The routine marks all the children of the root hub
  905. * as NOTATTACHED and marks logical connect-change events on their ports.
  906. */
  907. void usb_root_hub_lost_power(struct usb_device *rhdev)
  908. {
  909. struct usb_hub *hub;
  910. int port1;
  911. unsigned long flags;
  912. dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
  913. spin_lock_irqsave(&device_state_lock, flags);
  914. hub = hdev_to_hub(rhdev);
  915. for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
  916. if (rhdev->children[port1 - 1]) {
  917. recursively_mark_NOTATTACHED(
  918. rhdev->children[port1 - 1]);
  919. set_bit(port1, hub->change_bits);
  920. }
  921. }
  922. spin_unlock_irqrestore(&device_state_lock, flags);
  923. }
  924. EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
  925. #endif /* CONFIG_PM */
  926. static void choose_address(struct usb_device *udev)
  927. {
  928. int devnum;
  929. struct usb_bus *bus = udev->bus;
  930. /* If khubd ever becomes multithreaded, this will need a lock */
  931. /* Try to allocate the next devnum beginning at bus->devnum_next. */
  932. devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
  933. bus->devnum_next);
  934. if (devnum >= 128)
  935. devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
  936. bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
  937. if (devnum < 128) {
  938. set_bit(devnum, bus->devmap.devicemap);
  939. udev->devnum = devnum;
  940. }
  941. }
  942. static void release_address(struct usb_device *udev)
  943. {
  944. if (udev->devnum > 0) {
  945. clear_bit(udev->devnum, udev->bus->devmap.devicemap);
  946. udev->devnum = -1;
  947. }
  948. }
  949. /**
  950. * usb_disconnect - disconnect a device (usbcore-internal)
  951. * @pdev: pointer to device being disconnected
  952. * Context: !in_interrupt ()
  953. *
  954. * Something got disconnected. Get rid of it and all of its children.
  955. *
  956. * If *pdev is a normal device then the parent hub must already be locked.
  957. * If *pdev is a root hub then this routine will acquire the
  958. * usb_bus_list_lock on behalf of the caller.
  959. *
  960. * Only hub drivers (including virtual root hub drivers for host
  961. * controllers) should ever call this.
  962. *
  963. * This call is synchronous, and may not be used in an interrupt context.
  964. */
  965. void usb_disconnect(struct usb_device **pdev)
  966. {
  967. struct usb_device *udev = *pdev;
  968. int i;
  969. if (!udev) {
  970. pr_debug ("%s nodev\n", __FUNCTION__);
  971. return;
  972. }
  973. /* mark the device as inactive, so any further urb submissions for
  974. * this device (and any of its children) will fail immediately.
  975. * this quiesces everyting except pending urbs.
  976. */
  977. usb_set_device_state(udev, USB_STATE_NOTATTACHED);
  978. dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
  979. usb_lock_device(udev);
  980. /* Free up all the children before we remove this device */
  981. for (i = 0; i < USB_MAXCHILDREN; i++) {
  982. if (udev->children[i])
  983. usb_disconnect(&udev->children[i]);
  984. }
  985. /* deallocate hcd/hardware state ... nuking all pending urbs and
  986. * cleaning up all state associated with the current configuration
  987. * so that the hardware is now fully quiesced.
  988. */
  989. dev_dbg (&udev->dev, "unregistering device\n");
  990. usb_disable_device(udev, 0);
  991. usb_unlock_device(udev);
  992. /* Unregister the device. The device driver is responsible
  993. * for removing the device files from usbfs and sysfs and for
  994. * de-configuring the device.
  995. */
  996. device_del(&udev->dev);
  997. /* Free the device number and delete the parent's children[]
  998. * (or root_hub) pointer.
  999. */
  1000. release_address(udev);
  1001. /* Avoid races with recursively_mark_NOTATTACHED() */
  1002. spin_lock_irq(&device_state_lock);
  1003. *pdev = NULL;
  1004. spin_unlock_irq(&device_state_lock);
  1005. put_device(&udev->dev);
  1006. }
  1007. #ifdef DEBUG
  1008. static void show_string(struct usb_device *udev, char *id, char *string)
  1009. {
  1010. if (!string)
  1011. return;
  1012. dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
  1013. }
  1014. #else
  1015. static inline void show_string(struct usb_device *udev, char *id, char *string)
  1016. {}
  1017. #endif
  1018. #ifdef CONFIG_USB_OTG
  1019. #include "otg_whitelist.h"
  1020. #endif
  1021. /**
  1022. * usb_new_device - perform initial device setup (usbcore-internal)
  1023. * @udev: newly addressed device (in ADDRESS state)
  1024. *
  1025. * This is called with devices which have been enumerated, but not yet
  1026. * configured. The device descriptor is available, but not descriptors
  1027. * for any device configuration. The caller must have locked either
  1028. * the parent hub (if udev is a normal device) or else the
  1029. * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
  1030. * udev has already been installed, but udev is not yet visible through
  1031. * sysfs or other filesystem code.
  1032. *
  1033. * Returns 0 for success (device is configured and listed, with its
  1034. * interfaces, in sysfs); else a negative errno value.
  1035. *
  1036. * This call is synchronous, and may not be used in an interrupt context.
  1037. *
  1038. * Only the hub driver or root-hub registrar should ever call this.
  1039. */
  1040. int usb_new_device(struct usb_device *udev)
  1041. {
  1042. int err;
  1043. err = usb_get_configuration(udev);
  1044. if (err < 0) {
  1045. dev_err(&udev->dev, "can't read configurations, error %d\n",
  1046. err);
  1047. goto fail;
  1048. }
  1049. /* read the standard strings and cache them if present */
  1050. udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
  1051. udev->manufacturer = usb_cache_string(udev,
  1052. udev->descriptor.iManufacturer);
  1053. udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
  1054. /* Tell the world! */
  1055. dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
  1056. "SerialNumber=%d\n",
  1057. udev->descriptor.iManufacturer,
  1058. udev->descriptor.iProduct,
  1059. udev->descriptor.iSerialNumber);
  1060. show_string(udev, "Product", udev->product);
  1061. show_string(udev, "Manufacturer", udev->manufacturer);
  1062. show_string(udev, "SerialNumber", udev->serial);
  1063. #ifdef CONFIG_USB_OTG
  1064. /*
  1065. * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
  1066. * to wake us after we've powered off VBUS; and HNP, switching roles
  1067. * "host" to "peripheral". The OTG descriptor helps figure this out.
  1068. */
  1069. if (!udev->bus->is_b_host
  1070. && udev->config
  1071. && udev->parent == udev->bus->root_hub) {
  1072. struct usb_otg_descriptor *desc = 0;
  1073. struct usb_bus *bus = udev->bus;
  1074. /* descriptor may appear anywhere in config */
  1075. if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
  1076. le16_to_cpu(udev->config[0].desc.wTotalLength),
  1077. USB_DT_OTG, (void **) &desc) == 0) {
  1078. if (desc->bmAttributes & USB_OTG_HNP) {
  1079. unsigned port1 = udev->portnum;
  1080. struct usb_device *root = udev->parent;
  1081. dev_info(&udev->dev,
  1082. "Dual-Role OTG device on %sHNP port\n",
  1083. (port1 == bus->otg_port)
  1084. ? "" : "non-");
  1085. /* enable HNP before suspend, it's simpler */
  1086. if (port1 == bus->otg_port)
  1087. bus->b_hnp_enable = 1;
  1088. err = usb_control_msg(udev,
  1089. usb_sndctrlpipe(udev, 0),
  1090. USB_REQ_SET_FEATURE, 0,
  1091. bus->b_hnp_enable
  1092. ? USB_DEVICE_B_HNP_ENABLE
  1093. : USB_DEVICE_A_ALT_HNP_SUPPORT,
  1094. 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
  1095. if (err < 0) {
  1096. /* OTG MESSAGE: report errors here,
  1097. * customize to match your product.
  1098. */
  1099. dev_info(&udev->dev,
  1100. "can't set HNP mode; %d\n",
  1101. err);
  1102. bus->b_hnp_enable = 0;
  1103. }
  1104. }
  1105. }
  1106. }
  1107. if (!is_targeted(udev)) {
  1108. /* Maybe it can talk to us, though we can't talk to it.
  1109. * (Includes HNP test device.)
  1110. */
  1111. if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
  1112. static int __usb_port_suspend(struct usb_device *,
  1113. int port1);
  1114. err = __usb_port_suspend(udev, udev->bus->otg_port);
  1115. if (err < 0)
  1116. dev_dbg(&udev->dev, "HNP fail, %d\n", err);
  1117. }
  1118. err = -ENODEV;
  1119. goto fail;
  1120. }
  1121. #endif
  1122. /* Register the device. The device driver is responsible
  1123. * for adding the device files to usbfs and sysfs and for
  1124. * configuring the device.
  1125. */
  1126. err = device_add (&udev->dev);
  1127. if (err) {
  1128. dev_err(&udev->dev, "can't device_add, error %d\n", err);
  1129. goto fail;
  1130. }
  1131. return 0;
  1132. fail:
  1133. usb_set_device_state(udev, USB_STATE_NOTATTACHED);
  1134. return err;
  1135. }
  1136. static int hub_port_status(struct usb_hub *hub, int port1,
  1137. u16 *status, u16 *change)
  1138. {
  1139. int ret;
  1140. ret = get_port_status(hub->hdev, port1, &hub->status->port);
  1141. if (ret < 0)
  1142. dev_err (hub->intfdev,
  1143. "%s failed (err = %d)\n", __FUNCTION__, ret);
  1144. else {
  1145. *status = le16_to_cpu(hub->status->port.wPortStatus);
  1146. *change = le16_to_cpu(hub->status->port.wPortChange);
  1147. ret = 0;
  1148. }
  1149. return ret;
  1150. }
  1151. #define PORT_RESET_TRIES 5
  1152. #define SET_ADDRESS_TRIES 2
  1153. #define GET_DESCRIPTOR_TRIES 2
  1154. #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
  1155. #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
  1156. #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
  1157. #define HUB_SHORT_RESET_TIME 10
  1158. #define HUB_LONG_RESET_TIME 200
  1159. #define HUB_RESET_TIMEOUT 500
  1160. static int hub_port_wait_reset(struct usb_hub *hub, int port1,
  1161. struct usb_device *udev, unsigned int delay)
  1162. {
  1163. int delay_time, ret;
  1164. u16 portstatus;
  1165. u16 portchange;
  1166. for (delay_time = 0;
  1167. delay_time < HUB_RESET_TIMEOUT;
  1168. delay_time += delay) {
  1169. /* wait to give the device a chance to reset */
  1170. msleep(delay);
  1171. /* read and decode port status */
  1172. ret = hub_port_status(hub, port1, &portstatus, &portchange);
  1173. if (ret < 0)
  1174. return ret;
  1175. /* Device went away? */
  1176. if (!(portstatus & USB_PORT_STAT_CONNECTION))
  1177. return -ENOTCONN;
  1178. /* bomb out completely if something weird happened */
  1179. if ((portchange & USB_PORT_STAT_C_CONNECTION))
  1180. return -EINVAL;
  1181. /* if we`ve finished resetting, then break out of the loop */
  1182. if (!(portstatus & USB_PORT_STAT_RESET) &&
  1183. (portstatus & USB_PORT_STAT_ENABLE)) {
  1184. if (portstatus & USB_PORT_STAT_HIGH_SPEED)
  1185. udev->speed = USB_SPEED_HIGH;
  1186. else if (portstatus & USB_PORT_STAT_LOW_SPEED)
  1187. udev->speed = USB_SPEED_LOW;
  1188. else
  1189. udev->speed = USB_SPEED_FULL;
  1190. return 0;
  1191. }
  1192. /* switch to the long delay after two short delay failures */
  1193. if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
  1194. delay = HUB_LONG_RESET_TIME;
  1195. dev_dbg (hub->intfdev,
  1196. "port %d not reset yet, waiting %dms\n",
  1197. port1, delay);
  1198. }
  1199. return -EBUSY;
  1200. }
  1201. static int hub_port_reset(struct usb_hub *hub, int port1,
  1202. struct usb_device *udev, unsigned int delay)
  1203. {
  1204. int i, status;
  1205. /* Reset the port */
  1206. for (i = 0; i < PORT_RESET_TRIES; i++) {
  1207. status = set_port_feature(hub->hdev,
  1208. port1, USB_PORT_FEAT_RESET);
  1209. if (status)
  1210. dev_err(hub->intfdev,
  1211. "cannot reset port %d (err = %d)\n",
  1212. port1, status);
  1213. else {
  1214. status = hub_port_wait_reset(hub, port1, udev, delay);
  1215. if (status && status != -ENOTCONN)
  1216. dev_dbg(hub->intfdev,
  1217. "port_wait_reset: err = %d\n",
  1218. status);
  1219. }
  1220. /* return on disconnect or reset */
  1221. switch (status) {
  1222. case 0:
  1223. /* TRSTRCY = 10 ms; plus some extra */
  1224. msleep(10 + 40);
  1225. /* FALL THROUGH */
  1226. case -ENOTCONN:
  1227. case -ENODEV:
  1228. clear_port_feature(hub->hdev,
  1229. port1, USB_PORT_FEAT_C_RESET);
  1230. /* FIXME need disconnect() for NOTATTACHED device */
  1231. usb_set_device_state(udev, status
  1232. ? USB_STATE_NOTATTACHED
  1233. : USB_STATE_DEFAULT);
  1234. return status;
  1235. }
  1236. dev_dbg (hub->intfdev,
  1237. "port %d not enabled, trying reset again...\n",
  1238. port1);
  1239. delay = HUB_LONG_RESET_TIME;
  1240. }
  1241. dev_err (hub->intfdev,
  1242. "Cannot enable port %i. Maybe the USB cable is bad?\n",
  1243. port1);
  1244. return status;
  1245. }
  1246. /*
  1247. * Disable a port and mark a logical connnect-change event, so that some
  1248. * time later khubd will disconnect() any existing usb_device on the port
  1249. * and will re-enumerate if there actually is a device attached.
  1250. */
  1251. static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
  1252. {
  1253. dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
  1254. hub_port_disable(hub, port1, 1);
  1255. /* FIXME let caller ask to power down the port:
  1256. * - some devices won't enumerate without a VBUS power cycle
  1257. * - SRP saves power that way
  1258. * - ... new call, TBD ...
  1259. * That's easy if this hub can switch power per-port, and
  1260. * khubd reactivates the port later (timer, SRP, etc).
  1261. * Powerdown must be optional, because of reset/DFU.
  1262. */
  1263. set_bit(port1, hub->change_bits);
  1264. kick_khubd(hub);
  1265. }
  1266. #ifdef CONFIG_PM
  1267. #ifdef CONFIG_USB_SUSPEND
  1268. /*
  1269. * Selective port suspend reduces power; most suspended devices draw
  1270. * less than 500 uA. It's also used in OTG, along with remote wakeup.
  1271. * All devices below the suspended port are also suspended.
  1272. *
  1273. * Devices leave suspend state when the host wakes them up. Some devices
  1274. * also support "remote wakeup", where the device can activate the USB
  1275. * tree above them to deliver data, such as a keypress or packet. In
  1276. * some cases, this wakes the USB host.
  1277. */
  1278. static int hub_port_suspend(struct usb_hub *hub, int port1,
  1279. struct usb_device *udev)
  1280. {
  1281. int status;
  1282. // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
  1283. /* enable remote wakeup when appropriate; this lets the device
  1284. * wake up the upstream hub (including maybe the root hub).
  1285. *
  1286. * NOTE: OTG devices may issue remote wakeup (or SRP) even when
  1287. * we don't explicitly enable it here.
  1288. */
  1289. if (device_may_wakeup(&udev->dev)) {
  1290. status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  1291. USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
  1292. USB_DEVICE_REMOTE_WAKEUP, 0,
  1293. NULL, 0,
  1294. USB_CTRL_SET_TIMEOUT);
  1295. if (status)
  1296. dev_dbg(&udev->dev,
  1297. "won't remote wakeup, status %d\n",
  1298. status);
  1299. }
  1300. /* see 7.1.7.6 */
  1301. status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
  1302. if (status) {
  1303. dev_dbg(hub->intfdev,
  1304. "can't suspend port %d, status %d\n",
  1305. port1, status);
  1306. /* paranoia: "should not happen" */
  1307. (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  1308. USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
  1309. USB_DEVICE_REMOTE_WAKEUP, 0,
  1310. NULL, 0,
  1311. USB_CTRL_SET_TIMEOUT);
  1312. } else {
  1313. /* device has up to 10 msec to fully suspend */
  1314. dev_dbg(&udev->dev, "usb suspend\n");
  1315. usb_set_device_state(udev, USB_STATE_SUSPENDED);
  1316. msleep(10);
  1317. }
  1318. return status;
  1319. }
  1320. /*
  1321. * Devices on USB hub ports have only one "suspend" state, corresponding
  1322. * to ACPI D2, "may cause the device to lose some context".
  1323. * State transitions include:
  1324. *
  1325. * - suspend, resume ... when the VBUS power link stays live
  1326. * - suspend, disconnect ... VBUS lost
  1327. *
  1328. * Once VBUS drop breaks the circuit, the port it's using has to go through
  1329. * normal re-enumeration procedures, starting with enabling VBUS power.
  1330. * Other than re-initializing the hub (plug/unplug, except for root hubs),
  1331. * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
  1332. * timer, no SRP, no requests through sysfs.
  1333. *
  1334. * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
  1335. * the root hub for their bus goes into global suspend ... so we don't
  1336. * (falsely) update the device power state to say it suspended.
  1337. */
  1338. static int __usb_port_suspend (struct usb_device *udev, int port1)
  1339. {
  1340. int status = 0;
  1341. /* caller owns the udev device lock */
  1342. if (port1 < 0)
  1343. return port1;
  1344. /* we change the device's upstream USB link,
  1345. * but root hubs have no upstream USB link.
  1346. */
  1347. if (udev->parent)
  1348. status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
  1349. udev);
  1350. else {
  1351. dev_dbg(&udev->dev, "usb suspend\n");
  1352. usb_set_device_state(udev, USB_STATE_SUSPENDED);
  1353. }
  1354. return status;
  1355. }
  1356. /*
  1357. * usb_port_suspend - suspend a usb device's upstream port
  1358. * @udev: device that's no longer in active use
  1359. * Context: must be able to sleep; device not locked; pm locks held
  1360. *
  1361. * Suspends a USB device that isn't in active use, conserving power.
  1362. * Devices may wake out of a suspend, if anything important happens,
  1363. * using the remote wakeup mechanism. They may also be taken out of
  1364. * suspend by the host, using usb_port_resume(). It's also routine
  1365. * to disconnect devices while they are suspended.
  1366. *
  1367. * This only affects the USB hardware for a device; its interfaces
  1368. * (and, for hubs, child devices) must already have been suspended.
  1369. *
  1370. * Suspending OTG devices may trigger HNP, if that's been enabled
  1371. * between a pair of dual-role devices. That will change roles, such
  1372. * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
  1373. *
  1374. * Returns 0 on success, else negative errno.
  1375. */
  1376. int usb_port_suspend(struct usb_device *udev)
  1377. {
  1378. return __usb_port_suspend(udev, udev->portnum);
  1379. }
  1380. /*
  1381. * If the USB "suspend" state is in use (rather than "global suspend"),
  1382. * many devices will be individually taken out of suspend state using
  1383. * special" resume" signaling. These routines kick in shortly after
  1384. * hardware resume signaling is finished, either because of selective
  1385. * resume (by host) or remote wakeup (by device) ... now see what changed
  1386. * in the tree that's rooted at this device.
  1387. */
  1388. static int finish_port_resume(struct usb_device *udev)
  1389. {
  1390. int status;
  1391. u16 devstatus;
  1392. /* caller owns the udev device lock */
  1393. dev_dbg(&udev->dev, "finish resume\n");
  1394. /* usb ch9 identifies four variants of SUSPENDED, based on what
  1395. * state the device resumes to. Linux currently won't see the
  1396. * first two on the host side; they'd be inside hub_port_init()
  1397. * during many timeouts, but khubd can't suspend until later.
  1398. */
  1399. usb_set_device_state(udev, udev->actconfig
  1400. ? USB_STATE_CONFIGURED
  1401. : USB_STATE_ADDRESS);
  1402. /* 10.5.4.5 says be sure devices in the tree are still there.
  1403. * For now let's assume the device didn't go crazy on resume,
  1404. * and device drivers will know about any resume quirks.
  1405. */
  1406. status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
  1407. if (status >= 0)
  1408. status = (status == 2 ? 0 : -ENODEV);
  1409. if (status)
  1410. dev_dbg(&udev->dev,
  1411. "gone after usb resume? status %d\n",
  1412. status);
  1413. else if (udev->actconfig) {
  1414. le16_to_cpus(&devstatus);
  1415. if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
  1416. && udev->parent) {
  1417. status = usb_control_msg(udev,
  1418. usb_sndctrlpipe(udev, 0),
  1419. USB_REQ_CLEAR_FEATURE,
  1420. USB_RECIP_DEVICE,
  1421. USB_DEVICE_REMOTE_WAKEUP, 0,
  1422. NULL, 0,
  1423. USB_CTRL_SET_TIMEOUT);
  1424. if (status)
  1425. dev_dbg(&udev->dev, "disable remote "
  1426. "wakeup, status %d\n", status);
  1427. }
  1428. status = 0;
  1429. } else if (udev->devnum <= 0) {
  1430. dev_dbg(&udev->dev, "bogus resume!\n");
  1431. status = -EINVAL;
  1432. }
  1433. return status;
  1434. }
  1435. static int
  1436. hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
  1437. {
  1438. int status;
  1439. // dev_dbg(hub->intfdev, "resume port %d\n", port1);
  1440. /* see 7.1.7.7; affects power usage, but not budgeting */
  1441. status = clear_port_feature(hub->hdev,
  1442. port1, USB_PORT_FEAT_SUSPEND);
  1443. if (status) {
  1444. dev_dbg(hub->intfdev,
  1445. "can't resume port %d, status %d\n",
  1446. port1, status);
  1447. } else {
  1448. u16 devstatus;
  1449. u16 portchange;
  1450. /* drive resume for at least 20 msec */
  1451. if (udev)
  1452. dev_dbg(&udev->dev, "RESUME\n");
  1453. msleep(25);
  1454. #define LIVE_FLAGS ( USB_PORT_STAT_POWER \
  1455. | USB_PORT_STAT_ENABLE \
  1456. | USB_PORT_STAT_CONNECTION)
  1457. /* Virtual root hubs can trigger on GET_PORT_STATUS to
  1458. * stop resume signaling. Then finish the resume
  1459. * sequence.
  1460. */
  1461. devstatus = portchange = 0;
  1462. status = hub_port_status(hub, port1,
  1463. &devstatus, &portchange);
  1464. if (status < 0
  1465. || (devstatus & LIVE_FLAGS) != LIVE_FLAGS
  1466. || (devstatus & USB_PORT_STAT_SUSPEND) != 0
  1467. ) {
  1468. dev_dbg(hub->intfdev,
  1469. "port %d status %04x.%04x after resume, %d\n",
  1470. port1, portchange, devstatus, status);
  1471. if (status >= 0)
  1472. status = -ENODEV;
  1473. } else {
  1474. if (portchange & USB_PORT_STAT_C_SUSPEND)
  1475. clear_port_feature(hub->hdev, port1,
  1476. USB_PORT_FEAT_C_SUSPEND);
  1477. /* TRSMRCY = 10 msec */
  1478. msleep(10);
  1479. if (udev)
  1480. status = finish_port_resume(udev);
  1481. }
  1482. }
  1483. if (status < 0)
  1484. hub_port_logical_disconnect(hub, port1);
  1485. return status;
  1486. }
  1487. /*
  1488. * usb_port_resume - re-activate a suspended usb device's upstream port
  1489. * @udev: device to re-activate
  1490. * Context: must be able to sleep; device not locked; pm locks held
  1491. *
  1492. * This will re-activate the suspended device, increasing power usage
  1493. * while letting drivers communicate again with its endpoints.
  1494. * USB resume explicitly guarantees that the power session between
  1495. * the host and the device is the same as it was when the device
  1496. * suspended.
  1497. *
  1498. * Returns 0 on success, else negative errno.
  1499. */
  1500. int usb_port_resume(struct usb_device *udev)
  1501. {
  1502. int status;
  1503. /* we change the device's upstream USB link,
  1504. * but root hubs have no upstream USB link.
  1505. */
  1506. if (udev->parent) {
  1507. // NOTE this fails if parent is also suspended...
  1508. status = hub_port_resume(hdev_to_hub(udev->parent),
  1509. udev->portnum, udev);
  1510. } else
  1511. status = finish_port_resume(udev);
  1512. if (status < 0)
  1513. dev_dbg(&udev->dev, "can't resume, status %d\n", status);
  1514. return status;
  1515. }
  1516. static int remote_wakeup(struct usb_device *udev)
  1517. {
  1518. int status = 0;
  1519. /* don't repeat RESUME sequence if this device
  1520. * was already woken up by some other task
  1521. */
  1522. usb_lock_device(udev);
  1523. if (udev->state == USB_STATE_SUSPENDED) {
  1524. dev_dbg(&udev->dev, "RESUME (wakeup)\n");
  1525. /* TRSMRCY = 10 msec */
  1526. msleep(10);
  1527. status = finish_port_resume(udev);
  1528. }
  1529. if (status == 0)
  1530. usb_resume_both(udev);
  1531. usb_unlock_device(udev);
  1532. return status;
  1533. }
  1534. #else /* CONFIG_USB_SUSPEND */
  1535. /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
  1536. int usb_port_suspend(struct usb_device *udev)
  1537. {
  1538. return 0;
  1539. }
  1540. static inline int
  1541. finish_port_resume(struct usb_device *udev)
  1542. {
  1543. return 0;
  1544. }
  1545. static inline int
  1546. hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
  1547. {
  1548. return 0;
  1549. }
  1550. int usb_port_resume(struct usb_device *udev)
  1551. {
  1552. return 0;
  1553. }
  1554. static inline int remote_wakeup(struct usb_device *udev)
  1555. {
  1556. return 0;
  1557. }
  1558. #endif
  1559. static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
  1560. {
  1561. struct usb_hub *hub = usb_get_intfdata (intf);
  1562. struct usb_device *hdev = hub->hdev;
  1563. unsigned port1;
  1564. /* fail if children aren't already suspended */
  1565. for (port1 = 1; port1 <= hdev->maxchild; port1++) {
  1566. struct usb_device *udev;
  1567. udev = hdev->children [port1-1];
  1568. if (udev && msg.event == PM_EVENT_SUSPEND &&
  1569. #ifdef CONFIG_USB_SUSPEND
  1570. udev->state != USB_STATE_SUSPENDED
  1571. #else
  1572. udev->dev.power.power_state.event
  1573. == PM_EVENT_ON
  1574. #endif
  1575. ) {
  1576. dev_dbg(&intf->dev, "port %d nyet suspended\n", port1);
  1577. return -EBUSY;
  1578. }
  1579. }
  1580. /* "global suspend" of the downstream HC-to-USB interface */
  1581. if (!hdev->parent) {
  1582. struct usb_bus *bus = hdev->bus;
  1583. if (bus) {
  1584. int status = hcd_bus_suspend (bus);
  1585. if (status != 0) {
  1586. dev_dbg(&hdev->dev, "'global' suspend %d\n",
  1587. status);
  1588. return status;
  1589. }
  1590. } else
  1591. return -EOPNOTSUPP;
  1592. }
  1593. /* stop khubd and related activity */
  1594. hub_quiesce(hub);
  1595. return 0;
  1596. }
  1597. static int hub_resume(struct usb_interface *intf)
  1598. {
  1599. struct usb_device *hdev = interface_to_usbdev(intf);
  1600. struct usb_hub *hub = usb_get_intfdata (intf);
  1601. int status;
  1602. /* "global resume" of the downstream HC-to-USB interface */
  1603. if (!hdev->parent) {
  1604. struct usb_bus *bus = hdev->bus;
  1605. if (bus) {
  1606. status = hcd_bus_resume (bus);
  1607. if (status) {
  1608. dev_dbg(&intf->dev, "'global' resume %d\n",
  1609. status);
  1610. return status;
  1611. }
  1612. } else
  1613. return -EOPNOTSUPP;
  1614. if (status == 0) {
  1615. /* TRSMRCY = 10 msec */
  1616. msleep(10);
  1617. }
  1618. }
  1619. /* tell khubd to look for changes on this hub */
  1620. hub_activate(hub);
  1621. return 0;
  1622. }
  1623. #else /* CONFIG_PM */
  1624. static inline int remote_wakeup(struct usb_device *udev)
  1625. {
  1626. return 0;
  1627. }
  1628. #endif
  1629. void usb_suspend_root_hub(struct usb_device *hdev)
  1630. {
  1631. struct usb_hub *hub = hdev_to_hub(hdev);
  1632. /* This also makes any led blinker stop retriggering. We're called
  1633. * from irq, so the blinker might still be scheduled. Caller promises
  1634. * that the root hub status URB will be canceled.
  1635. */
  1636. __hub_quiesce(hub);
  1637. mark_quiesced(to_usb_interface(hub->intfdev));
  1638. }
  1639. void usb_resume_root_hub(struct usb_device *hdev)
  1640. {
  1641. struct usb_hub *hub = hdev_to_hub(hdev);
  1642. hub->resume_root_hub = 1;
  1643. kick_khubd(hub);
  1644. }
  1645. /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
  1646. *
  1647. * Between connect detection and reset signaling there must be a delay
  1648. * of 100ms at least for debounce and power-settling. The corresponding
  1649. * timer shall restart whenever the downstream port detects a disconnect.
  1650. *
  1651. * Apparently there are some bluetooth and irda-dongles and a number of
  1652. * low-speed devices for which this debounce period may last over a second.
  1653. * Not covered by the spec - but easy to deal with.
  1654. *
  1655. * This implementation uses a 1500ms total debounce timeout; if the
  1656. * connection isn't stable by then it returns -ETIMEDOUT. It checks
  1657. * every 25ms for transient disconnects. When the port status has been
  1658. * unchanged for 100ms it returns the port status.
  1659. */
  1660. #define HUB_DEBOUNCE_TIMEOUT 1500
  1661. #define HUB_DEBOUNCE_STEP 25
  1662. #define HUB_DEBOUNCE_STABLE 100
  1663. static int hub_port_debounce(struct usb_hub *hub, int port1)
  1664. {
  1665. int ret;
  1666. int total_time, stable_time = 0;
  1667. u16 portchange, portstatus;
  1668. unsigned connection = 0xffff;
  1669. for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
  1670. ret = hub_port_status(hub, port1, &portstatus, &portchange);
  1671. if (ret < 0)
  1672. return ret;
  1673. if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
  1674. (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
  1675. stable_time += HUB_DEBOUNCE_STEP;
  1676. if (stable_time >= HUB_DEBOUNCE_STABLE)
  1677. break;
  1678. } else {
  1679. stable_time = 0;
  1680. connection = portstatus & USB_PORT_STAT_CONNECTION;
  1681. }
  1682. if (portchange & USB_PORT_STAT_C_CONNECTION) {
  1683. clear_port_feature(hub->hdev, port1,
  1684. USB_PORT_FEAT_C_CONNECTION);
  1685. }
  1686. if (total_time >= HUB_DEBOUNCE_TIMEOUT)
  1687. break;
  1688. msleep(HUB_DEBOUNCE_STEP);
  1689. }
  1690. dev_dbg (hub->intfdev,
  1691. "debounce: port %d: total %dms stable %dms status 0x%x\n",
  1692. port1, total_time, stable_time, portstatus);
  1693. if (stable_time < HUB_DEBOUNCE_STABLE)
  1694. return -ETIMEDOUT;
  1695. return portstatus;
  1696. }
  1697. static void ep0_reinit(struct usb_device *udev)
  1698. {
  1699. usb_disable_endpoint(udev, 0 + USB_DIR_IN);
  1700. usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
  1701. udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
  1702. }
  1703. #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
  1704. #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
  1705. static int hub_set_address(struct usb_device *udev)
  1706. {
  1707. int retval;
  1708. if (udev->devnum == 0)
  1709. return -EINVAL;
  1710. if (udev->state == USB_STATE_ADDRESS)
  1711. return 0;
  1712. if (udev->state != USB_STATE_DEFAULT)
  1713. return -EINVAL;
  1714. retval = usb_control_msg(udev, usb_sndaddr0pipe(),
  1715. USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
  1716. NULL, 0, USB_CTRL_SET_TIMEOUT);
  1717. if (retval == 0) {
  1718. usb_set_device_state(udev, USB_STATE_ADDRESS);
  1719. ep0_reinit(udev);
  1720. }
  1721. return retval;
  1722. }
  1723. /* Reset device, (re)assign address, get device descriptor.
  1724. * Device connection must be stable, no more debouncing needed.
  1725. * Returns device in USB_STATE_ADDRESS, except on error.
  1726. *
  1727. * If this is called for an already-existing device (as part of
  1728. * usb_reset_device), the caller must own the device lock. For a
  1729. * newly detected device that is not accessible through any global
  1730. * pointers, it's not necessary to lock the device.
  1731. */
  1732. static int
  1733. hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
  1734. int retry_counter)
  1735. {
  1736. static DEFINE_MUTEX(usb_address0_mutex);
  1737. struct usb_device *hdev = hub->hdev;
  1738. int i, j, retval;
  1739. unsigned delay = HUB_SHORT_RESET_TIME;
  1740. enum usb_device_speed oldspeed = udev->speed;
  1741. /* root hub ports have a slightly longer reset period
  1742. * (from USB 2.0 spec, section 7.1.7.5)
  1743. */
  1744. if (!hdev->parent) {
  1745. delay = HUB_ROOT_RESET_TIME;
  1746. if (port1 == hdev->bus->otg_port)
  1747. hdev->bus->b_hnp_enable = 0;
  1748. }
  1749. /* Some low speed devices have problems with the quick delay, so */
  1750. /* be a bit pessimistic with those devices. RHbug #23670 */
  1751. if (oldspeed == USB_SPEED_LOW)
  1752. delay = HUB_LONG_RESET_TIME;
  1753. mutex_lock(&usb_address0_mutex);
  1754. /* Reset the device; full speed may morph to high speed */
  1755. retval = hub_port_reset(hub, port1, udev, delay);
  1756. if (retval < 0) /* error or disconnect */
  1757. goto fail;
  1758. /* success, speed is known */
  1759. retval = -ENODEV;
  1760. if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
  1761. dev_dbg(&udev->dev, "device reset changed speed!\n");
  1762. goto fail;
  1763. }
  1764. oldspeed = udev->speed;
  1765. /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
  1766. * it's fixed size except for full speed devices.
  1767. */
  1768. switch (udev->speed) {
  1769. case USB_SPEED_HIGH: /* fixed at 64 */
  1770. udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
  1771. break;
  1772. case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
  1773. /* to determine the ep0 maxpacket size, try to read
  1774. * the device descriptor to get bMaxPacketSize0 and
  1775. * then correct our initial guess.
  1776. */
  1777. udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
  1778. break;
  1779. case USB_SPEED_LOW: /* fixed at 8 */
  1780. udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
  1781. break;
  1782. default:
  1783. goto fail;
  1784. }
  1785. dev_info (&udev->dev,
  1786. "%s %s speed USB device using %s and address %d\n",
  1787. (udev->config) ? "reset" : "new",
  1788. ({ char *speed; switch (udev->speed) {
  1789. case USB_SPEED_LOW: speed = "low"; break;
  1790. case USB_SPEED_FULL: speed = "full"; break;
  1791. case USB_SPEED_HIGH: speed = "high"; break;
  1792. default: speed = "?"; break;
  1793. }; speed;}),
  1794. udev->bus->controller->driver->name,
  1795. udev->devnum);
  1796. /* Set up TT records, if needed */
  1797. if (hdev->tt) {
  1798. udev->tt = hdev->tt;
  1799. udev->ttport = hdev->ttport;
  1800. } else if (udev->speed != USB_SPEED_HIGH
  1801. && hdev->speed == USB_SPEED_HIGH) {
  1802. udev->tt = &hub->tt;
  1803. udev->ttport = port1;
  1804. }
  1805. /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
  1806. * Because device hardware and firmware is sometimes buggy in
  1807. * this area, and this is how Linux has done it for ages.
  1808. * Change it cautiously.
  1809. *
  1810. * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
  1811. * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
  1812. * so it may help with some non-standards-compliant devices.
  1813. * Otherwise we start with SET_ADDRESS and then try to read the
  1814. * first 8 bytes of the device descriptor to get the ep0 maxpacket
  1815. * value.
  1816. */
  1817. for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
  1818. if (USE_NEW_SCHEME(retry_counter)) {
  1819. struct usb_device_descriptor *buf;
  1820. int r = 0;
  1821. #define GET_DESCRIPTOR_BUFSIZE 64
  1822. buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
  1823. if (!buf) {
  1824. retval = -ENOMEM;
  1825. continue;
  1826. }
  1827. /* Use a short timeout the first time through,
  1828. * so that recalcitrant full-speed devices with
  1829. * 8- or 16-byte ep0-maxpackets won't slow things
  1830. * down tremendously by NAKing the unexpectedly
  1831. * early status stage. Also, retry on all errors;
  1832. * some devices are flakey.
  1833. */
  1834. for (j = 0; j < 3; ++j) {
  1835. buf->bMaxPacketSize0 = 0;
  1836. r = usb_control_msg(udev, usb_rcvaddr0pipe(),
  1837. USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
  1838. USB_DT_DEVICE << 8, 0,
  1839. buf, GET_DESCRIPTOR_BUFSIZE,
  1840. (i ? USB_CTRL_GET_TIMEOUT : 1000));
  1841. switch (buf->bMaxPacketSize0) {
  1842. case 8: case 16: case 32: case 64:
  1843. if (buf->bDescriptorType ==
  1844. USB_DT_DEVICE) {
  1845. r = 0;
  1846. break;
  1847. }
  1848. /* FALL THROUGH */
  1849. default:
  1850. if (r == 0)
  1851. r = -EPROTO;
  1852. break;
  1853. }
  1854. if (r == 0)
  1855. break;
  1856. }
  1857. udev->descriptor.bMaxPacketSize0 =
  1858. buf->bMaxPacketSize0;
  1859. kfree(buf);
  1860. retval = hub_port_reset(hub, port1, udev, delay);
  1861. if (retval < 0) /* error or disconnect */
  1862. goto fail;
  1863. if (oldspeed != udev->speed) {
  1864. dev_dbg(&udev->dev,
  1865. "device reset changed speed!\n");
  1866. retval = -ENODEV;
  1867. goto fail;
  1868. }
  1869. if (r) {
  1870. dev_err(&udev->dev, "device descriptor "
  1871. "read/%s, error %d\n",
  1872. "64", r);
  1873. retval = -EMSGSIZE;
  1874. continue;
  1875. }
  1876. #undef GET_DESCRIPTOR_BUFSIZE
  1877. }
  1878. for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
  1879. retval = hub_set_address(udev);
  1880. if (retval >= 0)
  1881. break;
  1882. msleep(200);
  1883. }
  1884. if (retval < 0) {
  1885. dev_err(&udev->dev,
  1886. "device not accepting address %d, error %d\n",
  1887. udev->devnum, retval);
  1888. goto fail;
  1889. }
  1890. /* cope with hardware quirkiness:
  1891. * - let SET_ADDRESS settle, some device hardware wants it
  1892. * - read ep0 maxpacket even for high and low speed,
  1893. */
  1894. msleep(10);
  1895. if (USE_NEW_SCHEME(retry_counter))
  1896. break;
  1897. retval = usb_get_device_descriptor(udev, 8);
  1898. if (retval < 8) {
  1899. dev_err(&udev->dev, "device descriptor "
  1900. "read/%s, error %d\n",
  1901. "8", retval);
  1902. if (retval >= 0)
  1903. retval = -EMSGSIZE;
  1904. } else {
  1905. retval = 0;
  1906. break;
  1907. }
  1908. }
  1909. if (retval)
  1910. goto fail;
  1911. i = udev->descriptor.bMaxPacketSize0;
  1912. if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
  1913. if (udev->speed != USB_SPEED_FULL ||
  1914. !(i == 8 || i == 16 || i == 32 || i == 64)) {
  1915. dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
  1916. retval = -EMSGSIZE;
  1917. goto fail;
  1918. }
  1919. dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
  1920. udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
  1921. ep0_reinit(udev);
  1922. }
  1923. retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
  1924. if (retval < (signed)sizeof(udev->descriptor)) {
  1925. dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
  1926. "all", retval);
  1927. if (retval >= 0)
  1928. retval = -ENOMSG;
  1929. goto fail;
  1930. }
  1931. retval = 0;
  1932. fail:
  1933. if (retval)
  1934. hub_port_disable(hub, port1, 0);
  1935. mutex_unlock(&usb_address0_mutex);
  1936. return retval;
  1937. }
  1938. static void
  1939. check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
  1940. {
  1941. struct usb_qualifier_descriptor *qual;
  1942. int status;
  1943. qual = kmalloc (sizeof *qual, SLAB_KERNEL);
  1944. if (qual == NULL)
  1945. return;
  1946. status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
  1947. qual, sizeof *qual);
  1948. if (status == sizeof *qual) {
  1949. dev_info(&udev->dev, "not running at top speed; "
  1950. "connect to a high speed hub\n");
  1951. /* hub LEDs are probably harder to miss than syslog */
  1952. if (hub->has_indicators) {
  1953. hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
  1954. schedule_work (&hub->leds);
  1955. }
  1956. }
  1957. kfree(qual);
  1958. }
  1959. static unsigned
  1960. hub_power_remaining (struct usb_hub *hub)
  1961. {
  1962. struct usb_device *hdev = hub->hdev;
  1963. int remaining;
  1964. int port1;
  1965. if (!hub->limited_power)
  1966. return 0;
  1967. remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
  1968. for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
  1969. struct usb_device *udev = hdev->children[port1 - 1];
  1970. int delta;
  1971. if (!udev)
  1972. continue;
  1973. /* Unconfigured devices may not use more than 100mA,
  1974. * or 8mA for OTG ports */
  1975. if (udev->actconfig)
  1976. delta = udev->actconfig->desc.bMaxPower * 2;
  1977. else if (port1 != udev->bus->otg_port || hdev->parent)
  1978. delta = 100;
  1979. else
  1980. delta = 8;
  1981. if (delta > hub->mA_per_port)
  1982. dev_warn(&udev->dev, "%dmA is over %umA budget "
  1983. "for port %d!\n",
  1984. delta, hub->mA_per_port, port1);
  1985. remaining -= delta;
  1986. }
  1987. if (remaining < 0) {
  1988. dev_warn(hub->intfdev, "%dmA over power budget!\n",
  1989. - remaining);
  1990. remaining = 0;
  1991. }
  1992. return remaining;
  1993. }
  1994. /* Handle physical or logical connection change events.
  1995. * This routine is called when:
  1996. * a port connection-change occurs;
  1997. * a port enable-change occurs (often caused by EMI);
  1998. * usb_reset_device() encounters changed descriptors (as from
  1999. * a firmware download)
  2000. * caller already locked the hub
  2001. */
  2002. static void hub_port_connect_change(struct usb_hub *hub, int port1,
  2003. u16 portstatus, u16 portchange)
  2004. {
  2005. struct usb_device *hdev = hub->hdev;
  2006. struct device *hub_dev = hub->intfdev;
  2007. u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
  2008. int status, i;
  2009. dev_dbg (hub_dev,
  2010. "port %d, status %04x, change %04x, %s\n",
  2011. port1, portstatus, portchange, portspeed (portstatus));
  2012. if (hub->has_indicators) {
  2013. set_port_led(hub, port1, HUB_LED_AUTO);
  2014. hub->indicator[port1-1] = INDICATOR_AUTO;
  2015. }
  2016. /* Disconnect any existing devices under this port */
  2017. if (hdev->children[port1-1])
  2018. usb_disconnect(&hdev->children[port1-1]);
  2019. clear_bit(port1, hub->change_bits);
  2020. #ifdef CONFIG_USB_OTG
  2021. /* during HNP, don't repeat the debounce */
  2022. if (hdev->bus->is_b_host)
  2023. portchange &= ~USB_PORT_STAT_C_CONNECTION;
  2024. #endif
  2025. if (portchange & USB_PORT_STAT_C_CONNECTION) {
  2026. status = hub_port_debounce(hub, port1);
  2027. if (status < 0) {
  2028. dev_err (hub_dev,
  2029. "connect-debounce failed, port %d disabled\n",
  2030. port1);
  2031. goto done;
  2032. }
  2033. portstatus = status;
  2034. }
  2035. /* Return now if nothing is connected */
  2036. if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
  2037. /* maybe switch power back on (e.g. root hub was reset) */
  2038. if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
  2039. && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
  2040. set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
  2041. if (portstatus & USB_PORT_STAT_ENABLE)
  2042. goto done;
  2043. return;
  2044. }
  2045. #ifdef CONFIG_USB_SUSPEND
  2046. /* If something is connected, but the port is suspended, wake it up. */
  2047. if (portstatus & USB_PORT_STAT_SUSPEND) {
  2048. status = hub_port_resume(hub, port1, NULL);
  2049. if (status < 0) {
  2050. dev_dbg(hub_dev,
  2051. "can't clear suspend on port %d; %d\n",
  2052. port1, status);
  2053. goto done;
  2054. }
  2055. }
  2056. #endif
  2057. for (i = 0; i < SET_CONFIG_TRIES; i++) {
  2058. struct usb_device *udev;
  2059. /* reallocate for each attempt, since references
  2060. * to the previous one can escape in various ways
  2061. */
  2062. udev = usb_alloc_dev(hdev, hdev->bus, port1);
  2063. if (!udev) {
  2064. dev_err (hub_dev,
  2065. "couldn't allocate port %d usb_device\n",
  2066. port1);
  2067. goto done;
  2068. }
  2069. usb_set_device_state(udev, USB_STATE_POWERED);
  2070. udev->speed = USB_SPEED_UNKNOWN;
  2071. udev->bus_mA = hub->mA_per_port;
  2072. /* set the address */
  2073. choose_address(udev);
  2074. if (udev->devnum <= 0) {
  2075. status = -ENOTCONN; /* Don't retry */
  2076. goto loop;
  2077. }
  2078. /* reset and get descriptor */
  2079. status = hub_port_init(hub, udev, port1, i);
  2080. if (status < 0)
  2081. goto loop;
  2082. /* consecutive bus-powered hubs aren't reliable; they can
  2083. * violate the voltage drop budget. if the new child has
  2084. * a "powered" LED, users should notice we didn't enable it
  2085. * (without reading syslog), even without per-port LEDs
  2086. * on the parent.
  2087. */
  2088. if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
  2089. && udev->bus_mA <= 100) {
  2090. u16 devstat;
  2091. status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
  2092. &devstat);
  2093. if (status < 2) {
  2094. dev_dbg(&udev->dev, "get status %d ?\n", status);
  2095. goto loop_disable;
  2096. }
  2097. le16_to_cpus(&devstat);
  2098. if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
  2099. dev_err(&udev->dev,
  2100. "can't connect bus-powered hub "
  2101. "to this port\n");
  2102. if (hub->has_indicators) {
  2103. hub->indicator[port1-1] =
  2104. INDICATOR_AMBER_BLINK;
  2105. schedule_work (&hub->leds);
  2106. }
  2107. status = -ENOTCONN; /* Don't retry */
  2108. goto loop_disable;
  2109. }
  2110. }
  2111. /* check for devices running slower than they could */
  2112. if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
  2113. && udev->speed == USB_SPEED_FULL
  2114. && highspeed_hubs != 0)
  2115. check_highspeed (hub, udev, port1);
  2116. /* Store the parent's children[] pointer. At this point
  2117. * udev becomes globally accessible, although presumably
  2118. * no one will look at it until hdev is unlocked.
  2119. */
  2120. status = 0;
  2121. /* We mustn't add new devices if the parent hub has
  2122. * been disconnected; we would race with the
  2123. * recursively_mark_NOTATTACHED() routine.
  2124. */
  2125. spin_lock_irq(&device_state_lock);
  2126. if (hdev->state == USB_STATE_NOTATTACHED)
  2127. status = -ENOTCONN;
  2128. else
  2129. hdev->children[port1-1] = udev;
  2130. spin_unlock_irq(&device_state_lock);
  2131. /* Run it through the hoops (find a driver, etc) */
  2132. if (!status) {
  2133. status = usb_new_device(udev);
  2134. if (status) {
  2135. spin_lock_irq(&device_state_lock);
  2136. hdev->children[port1-1] = NULL;
  2137. spin_unlock_irq(&device_state_lock);
  2138. }
  2139. }
  2140. if (status)
  2141. goto loop_disable;
  2142. status = hub_power_remaining(hub);
  2143. if (status)
  2144. dev_dbg(hub_dev, "%dmA power budget left\n", status);
  2145. return;
  2146. loop_disable:
  2147. hub_port_disable(hub, port1, 1);
  2148. loop:
  2149. ep0_reinit(udev);
  2150. release_address(udev);
  2151. usb_put_dev(udev);
  2152. if (status == -ENOTCONN)
  2153. break;
  2154. }
  2155. done:
  2156. hub_port_disable(hub, port1, 1);
  2157. }
  2158. static void hub_events(void)
  2159. {
  2160. struct list_head *tmp;
  2161. struct usb_device *hdev;
  2162. struct usb_interface *intf;
  2163. struct usb_hub *hub;
  2164. struct device *hub_dev;
  2165. u16 hubstatus;
  2166. u16 hubchange;
  2167. u16 portstatus;
  2168. u16 portchange;
  2169. int i, ret;
  2170. int connect_change;
  2171. /*
  2172. * We restart the list every time to avoid a deadlock with
  2173. * deleting hubs downstream from this one. This should be
  2174. * safe since we delete the hub from the event list.
  2175. * Not the most efficient, but avoids deadlocks.
  2176. */
  2177. while (1) {
  2178. /* Grab the first entry at the beginning of the list */
  2179. spin_lock_irq(&hub_event_lock);
  2180. if (list_empty(&hub_event_list)) {
  2181. spin_unlock_irq(&hub_event_lock);
  2182. break;
  2183. }
  2184. tmp = hub_event_list.next;
  2185. list_del_init(tmp);
  2186. hub = list_entry(tmp, struct usb_hub, event_list);
  2187. hdev = hub->hdev;
  2188. intf = to_usb_interface(hub->intfdev);
  2189. hub_dev = &intf->dev;
  2190. i = hub->resume_root_hub;
  2191. dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x%s\n",
  2192. hdev->state, hub->descriptor
  2193. ? hub->descriptor->bNbrPorts
  2194. : 0,
  2195. /* NOTE: expects max 15 ports... */
  2196. (u16) hub->change_bits[0],
  2197. (u16) hub->event_bits[0],
  2198. i ? ", resume root" : "");
  2199. usb_get_intf(intf);
  2200. spin_unlock_irq(&hub_event_lock);
  2201. /* Lock the device, then check to see if we were
  2202. * disconnected while waiting for the lock to succeed. */
  2203. if (locktree(hdev) < 0) {
  2204. usb_put_intf(intf);
  2205. continue;
  2206. }
  2207. if (hub != usb_get_intfdata(intf))
  2208. goto loop;
  2209. /* If the hub has died, clean up after it */
  2210. if (hdev->state == USB_STATE_NOTATTACHED) {
  2211. hub->error = -ENODEV;
  2212. hub_pre_reset(intf);
  2213. goto loop;
  2214. }
  2215. /* Is this is a root hub wanting to reactivate the downstream
  2216. * ports? If so, be sure the interface resumes even if its
  2217. * stub "device" node was never suspended.
  2218. */
  2219. if (i)
  2220. usb_resume_both(hdev);
  2221. /* If this is an inactive or suspended hub, do nothing */
  2222. if (hub->quiescing)
  2223. goto loop;
  2224. if (hub->error) {
  2225. dev_dbg (hub_dev, "resetting for error %d\n",
  2226. hub->error);
  2227. ret = usb_reset_composite_device(hdev, intf);
  2228. if (ret) {
  2229. dev_dbg (hub_dev,
  2230. "error resetting hub: %d\n", ret);
  2231. goto loop;
  2232. }
  2233. hub->nerrors = 0;
  2234. hub->error = 0;
  2235. }
  2236. /* deal with port status changes */
  2237. for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
  2238. if (test_bit(i, hub->busy_bits))
  2239. continue;
  2240. connect_change = test_bit(i, hub->change_bits);
  2241. if (!test_and_clear_bit(i, hub->event_bits) &&
  2242. !connect_change && !hub->activating)
  2243. continue;
  2244. ret = hub_port_status(hub, i,
  2245. &portstatus, &portchange);
  2246. if (ret < 0)
  2247. continue;
  2248. if (hub->activating && !hdev->children[i-1] &&
  2249. (portstatus &
  2250. USB_PORT_STAT_CONNECTION))
  2251. connect_change = 1;
  2252. if (portchange & USB_PORT_STAT_C_CONNECTION) {
  2253. clear_port_feature(hdev, i,
  2254. USB_PORT_FEAT_C_CONNECTION);
  2255. connect_change = 1;
  2256. }
  2257. if (portchange & USB_PORT_STAT_C_ENABLE) {
  2258. if (!connect_change)
  2259. dev_dbg (hub_dev,
  2260. "port %d enable change, "
  2261. "status %08x\n",
  2262. i, portstatus);
  2263. clear_port_feature(hdev, i,
  2264. USB_PORT_FEAT_C_ENABLE);
  2265. /*
  2266. * EM interference sometimes causes badly
  2267. * shielded USB devices to be shutdown by
  2268. * the hub, this hack enables them again.
  2269. * Works at least with mouse driver.
  2270. */
  2271. if (!(portstatus & USB_PORT_STAT_ENABLE)
  2272. && !connect_change
  2273. && hdev->children[i-1]) {
  2274. dev_err (hub_dev,
  2275. "port %i "
  2276. "disabled by hub (EMI?), "
  2277. "re-enabling...\n",
  2278. i);
  2279. connect_change = 1;
  2280. }
  2281. }
  2282. if (portchange & USB_PORT_STAT_C_SUSPEND) {
  2283. clear_port_feature(hdev, i,
  2284. USB_PORT_FEAT_C_SUSPEND);
  2285. if (hdev->children[i-1]) {
  2286. ret = remote_wakeup(hdev->
  2287. children[i-1]);
  2288. if (ret < 0)
  2289. connect_change = 1;
  2290. } else {
  2291. ret = -ENODEV;
  2292. hub_port_disable(hub, i, 1);
  2293. }
  2294. dev_dbg (hub_dev,
  2295. "resume on port %d, status %d\n",
  2296. i, ret);
  2297. }
  2298. if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
  2299. dev_err (hub_dev,
  2300. "over-current change on port %d\n",
  2301. i);
  2302. clear_port_feature(hdev, i,
  2303. USB_PORT_FEAT_C_OVER_CURRENT);
  2304. hub_power_on(hub);
  2305. }
  2306. if (portchange & USB_PORT_STAT_C_RESET) {
  2307. dev_dbg (hub_dev,
  2308. "reset change on port %d\n",
  2309. i);
  2310. clear_port_feature(hdev, i,
  2311. USB_PORT_FEAT_C_RESET);
  2312. }
  2313. if (connect_change)
  2314. hub_port_connect_change(hub, i,
  2315. portstatus, portchange);
  2316. } /* end for i */
  2317. /* deal with hub status changes */
  2318. if (test_and_clear_bit(0, hub->event_bits) == 0)
  2319. ; /* do nothing */
  2320. else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
  2321. dev_err (hub_dev, "get_hub_status failed\n");
  2322. else {
  2323. if (hubchange & HUB_CHANGE_LOCAL_POWER) {
  2324. dev_dbg (hub_dev, "power change\n");
  2325. clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
  2326. if (hubstatus & HUB_STATUS_LOCAL_POWER)
  2327. /* FIXME: Is this always true? */
  2328. hub->limited_power = 0;
  2329. else
  2330. hub->limited_power = 1;
  2331. }
  2332. if (hubchange & HUB_CHANGE_OVERCURRENT) {
  2333. dev_dbg (hub_dev, "overcurrent change\n");
  2334. msleep(500); /* Cool down */
  2335. clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
  2336. hub_power_on(hub);
  2337. }
  2338. }
  2339. hub->activating = 0;
  2340. /* If this is a root hub, tell the HCD it's okay to
  2341. * re-enable port-change interrupts now. */
  2342. if (!hdev->parent)
  2343. usb_enable_root_hub_irq(hdev->bus);
  2344. loop:
  2345. usb_unlock_device(hdev);
  2346. usb_put_intf(intf);
  2347. } /* end while (1) */
  2348. }
  2349. static int hub_thread(void *__unused)
  2350. {
  2351. do {
  2352. hub_events();
  2353. wait_event_interruptible(khubd_wait,
  2354. !list_empty(&hub_event_list) ||
  2355. kthread_should_stop());
  2356. try_to_freeze();
  2357. } while (!kthread_should_stop() || !list_empty(&hub_event_list));
  2358. pr_debug("%s: khubd exiting\n", usbcore_name);
  2359. return 0;
  2360. }
  2361. static struct usb_device_id hub_id_table [] = {
  2362. { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
  2363. .bDeviceClass = USB_CLASS_HUB},
  2364. { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
  2365. .bInterfaceClass = USB_CLASS_HUB},
  2366. { } /* Terminating entry */
  2367. };
  2368. MODULE_DEVICE_TABLE (usb, hub_id_table);
  2369. static struct usb_driver hub_driver = {
  2370. .name = "hub",
  2371. .probe = hub_probe,
  2372. .disconnect = hub_disconnect,
  2373. .suspend = hub_suspend,
  2374. .resume = hub_resume,
  2375. .pre_reset = hub_pre_reset,
  2376. .post_reset = hub_post_reset,
  2377. .ioctl = hub_ioctl,
  2378. .id_table = hub_id_table,
  2379. };
  2380. int usb_hub_init(void)
  2381. {
  2382. if (usb_register(&hub_driver) < 0) {
  2383. printk(KERN_ERR "%s: can't register hub driver\n",
  2384. usbcore_name);
  2385. return -1;
  2386. }
  2387. khubd_task = kthread_run(hub_thread, NULL, "khubd");
  2388. if (!IS_ERR(khubd_task))
  2389. return 0;
  2390. /* Fall through if kernel_thread failed */
  2391. usb_deregister(&hub_driver);
  2392. printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
  2393. return -1;
  2394. }
  2395. void usb_hub_cleanup(void)
  2396. {
  2397. kthread_stop(khubd_task);
  2398. /*
  2399. * Hub resources are freed for us by usb_deregister. It calls
  2400. * usb_driver_purge on every device which in turn calls that
  2401. * devices disconnect function if it is using this driver.
  2402. * The hub_disconnect function takes care of releasing the
  2403. * individual hub resources. -greg
  2404. */
  2405. usb_deregister(&hub_driver);
  2406. } /* usb_hub_cleanup() */
  2407. static int config_descriptors_changed(struct usb_device *udev)
  2408. {
  2409. unsigned index;
  2410. unsigned len = 0;
  2411. struct usb_config_descriptor *buf;
  2412. for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
  2413. if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
  2414. len = le16_to_cpu(udev->config[index].desc.wTotalLength);
  2415. }
  2416. buf = kmalloc (len, SLAB_KERNEL);
  2417. if (buf == NULL) {
  2418. dev_err(&udev->dev, "no mem to re-read configs after reset\n");
  2419. /* assume the worst */
  2420. return 1;
  2421. }
  2422. for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
  2423. int length;
  2424. int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
  2425. length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
  2426. old_length);
  2427. if (length < old_length) {
  2428. dev_dbg(&udev->dev, "config index %d, error %d\n",
  2429. index, length);
  2430. break;
  2431. }
  2432. if (memcmp (buf, udev->rawdescriptors[index], old_length)
  2433. != 0) {
  2434. dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
  2435. index, buf->bConfigurationValue);
  2436. break;
  2437. }
  2438. }
  2439. kfree(buf);
  2440. return index != udev->descriptor.bNumConfigurations;
  2441. }
  2442. /**
  2443. * usb_reset_device - perform a USB port reset to reinitialize a device
  2444. * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
  2445. *
  2446. * WARNING - don't use this routine to reset a composite device
  2447. * (one with multiple interfaces owned by separate drivers)!
  2448. * Use usb_reset_composite_device() instead.
  2449. *
  2450. * Do a port reset, reassign the device's address, and establish its
  2451. * former operating configuration. If the reset fails, or the device's
  2452. * descriptors change from their values before the reset, or the original
  2453. * configuration and altsettings cannot be restored, a flag will be set
  2454. * telling khubd to pretend the device has been disconnected and then
  2455. * re-connected. All drivers will be unbound, and the device will be
  2456. * re-enumerated and probed all over again.
  2457. *
  2458. * Returns 0 if the reset succeeded, -ENODEV if the device has been
  2459. * flagged for logical disconnection, or some other negative error code
  2460. * if the reset wasn't even attempted.
  2461. *
  2462. * The caller must own the device lock. For example, it's safe to use
  2463. * this from a driver probe() routine after downloading new firmware.
  2464. * For calls that might not occur during probe(), drivers should lock
  2465. * the device using usb_lock_device_for_reset().
  2466. */
  2467. int usb_reset_device(struct usb_device *udev)
  2468. {
  2469. struct usb_device *parent_hdev = udev->parent;
  2470. struct usb_hub *parent_hub;
  2471. struct usb_device_descriptor descriptor = udev->descriptor;
  2472. int i, ret = 0;
  2473. int port1 = udev->portnum;
  2474. if (udev->state == USB_STATE_NOTATTACHED ||
  2475. udev->state == USB_STATE_SUSPENDED) {
  2476. dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
  2477. udev->state);
  2478. return -EINVAL;
  2479. }
  2480. if (!parent_hdev) {
  2481. /* this requires hcd-specific logic; see OHCI hc_restart() */
  2482. dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
  2483. return -EISDIR;
  2484. }
  2485. parent_hub = hdev_to_hub(parent_hdev);
  2486. set_bit(port1, parent_hub->busy_bits);
  2487. for (i = 0; i < SET_CONFIG_TRIES; ++i) {
  2488. /* ep0 maxpacket size may change; let the HCD know about it.
  2489. * Other endpoints will be handled by re-enumeration. */
  2490. ep0_reinit(udev);
  2491. ret = hub_port_init(parent_hub, udev, port1, i);
  2492. if (ret >= 0)
  2493. break;
  2494. }
  2495. clear_bit(port1, parent_hub->busy_bits);
  2496. if (ret < 0)
  2497. goto re_enumerate;
  2498. /* Device might have changed firmware (DFU or similar) */
  2499. if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
  2500. || config_descriptors_changed (udev)) {
  2501. dev_info(&udev->dev, "device firmware changed\n");
  2502. udev->descriptor = descriptor; /* for disconnect() calls */
  2503. goto re_enumerate;
  2504. }
  2505. if (!udev->actconfig)
  2506. goto done;
  2507. ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
  2508. USB_REQ_SET_CONFIGURATION, 0,
  2509. udev->actconfig->desc.bConfigurationValue, 0,
  2510. NULL, 0, USB_CTRL_SET_TIMEOUT);
  2511. if (ret < 0) {
  2512. dev_err(&udev->dev,
  2513. "can't restore configuration #%d (error=%d)\n",
  2514. udev->actconfig->desc.bConfigurationValue, ret);
  2515. goto re_enumerate;
  2516. }
  2517. usb_set_device_state(udev, USB_STATE_CONFIGURED);
  2518. for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
  2519. struct usb_interface *intf = udev->actconfig->interface[i];
  2520. struct usb_interface_descriptor *desc;
  2521. /* set_interface resets host side toggle even
  2522. * for altsetting zero. the interface may have no driver.
  2523. */
  2524. desc = &intf->cur_altsetting->desc;
  2525. ret = usb_set_interface(udev, desc->bInterfaceNumber,
  2526. desc->bAlternateSetting);
  2527. if (ret < 0) {
  2528. dev_err(&udev->dev, "failed to restore interface %d "
  2529. "altsetting %d (error=%d)\n",
  2530. desc->bInterfaceNumber,
  2531. desc->bAlternateSetting,
  2532. ret);
  2533. goto re_enumerate;
  2534. }
  2535. }
  2536. done:
  2537. return 0;
  2538. re_enumerate:
  2539. hub_port_logical_disconnect(parent_hub, port1);
  2540. return -ENODEV;
  2541. }
  2542. EXPORT_SYMBOL(usb_reset_device);
  2543. /**
  2544. * usb_reset_composite_device - warn interface drivers and perform a USB port reset
  2545. * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
  2546. * @iface: interface bound to the driver making the request (optional)
  2547. *
  2548. * Warns all drivers bound to registered interfaces (using their pre_reset
  2549. * method), performs the port reset, and then lets the drivers know that
  2550. * the reset is over (using their post_reset method).
  2551. *
  2552. * Return value is the same as for usb_reset_device().
  2553. *
  2554. * The caller must own the device lock. For example, it's safe to use
  2555. * this from a driver probe() routine after downloading new firmware.
  2556. * For calls that might not occur during probe(), drivers should lock
  2557. * the device using usb_lock_device_for_reset().
  2558. *
  2559. * The interface locks are acquired during the pre_reset stage and released
  2560. * during the post_reset stage. However if iface is not NULL and is
  2561. * currently being probed, we assume that the caller already owns its
  2562. * lock.
  2563. */
  2564. int usb_reset_composite_device(struct usb_device *udev,
  2565. struct usb_interface *iface)
  2566. {
  2567. int ret;
  2568. struct usb_host_config *config = udev->actconfig;
  2569. if (udev->state == USB_STATE_NOTATTACHED ||
  2570. udev->state == USB_STATE_SUSPENDED) {
  2571. dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
  2572. udev->state);
  2573. return -EINVAL;
  2574. }
  2575. if (iface && iface->condition != USB_INTERFACE_BINDING)
  2576. iface = NULL;
  2577. if (config) {
  2578. int i;
  2579. struct usb_interface *cintf;
  2580. struct usb_driver *drv;
  2581. for (i = 0; i < config->desc.bNumInterfaces; ++i) {
  2582. cintf = config->interface[i];
  2583. if (cintf != iface)
  2584. down(&cintf->dev.sem);
  2585. if (device_is_registered(&cintf->dev) &&
  2586. cintf->dev.driver) {
  2587. drv = to_usb_driver(cintf->dev.driver);
  2588. if (drv->pre_reset)
  2589. (drv->pre_reset)(cintf);
  2590. }
  2591. }
  2592. }
  2593. ret = usb_reset_device(udev);
  2594. if (config) {
  2595. int i;
  2596. struct usb_interface *cintf;
  2597. struct usb_driver *drv;
  2598. for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
  2599. cintf = config->interface[i];
  2600. if (device_is_registered(&cintf->dev) &&
  2601. cintf->dev.driver) {
  2602. drv = to_usb_driver(cintf->dev.driver);
  2603. if (drv->post_reset)
  2604. (drv->post_reset)(cintf);
  2605. }
  2606. if (cintf != iface)
  2607. up(&cintf->dev.sem);
  2608. }
  2609. }
  2610. return ret;
  2611. }
  2612. EXPORT_SYMBOL(usb_reset_composite_device);