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 11 #include <linux/kernel.h> 12 #include <linux/errno.h> 13 #include <linux/module.h> 14 #include <linux/moduleparam.h> 15 #include <linux/completion.h> 16 #include <linux/sched.h> 17 #include <linux/list.h> 18 #include <linux/slab.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 <linux/freezer.h> 25 26 #include <asm/semaphore.h> 27 #include <asm/uaccess.h> 28 #include <asm/byteorder.h> 29 30 #include "usb.h" 31 #include "hcd.h" 32 #include "hub.h" 33 34 #ifdef CONFIG_USB_PERSIST 35 #define USB_PERSIST 1 36 #else 37 #define USB_PERSIST 0 38 #endif 39 40 struct usb_hub { 41 struct device *intfdev; /* the "interface" device */ 42 struct usb_device *hdev; 43 struct kref kref; 44 struct urb *urb; /* for interrupt polling pipe */ 45 46 /* buffer for urb ... with extra space in case of babble */ 47 char (*buffer)[8]; 48 dma_addr_t buffer_dma; /* DMA address for buffer */ 49 union { 50 struct usb_hub_status hub; 51 struct usb_port_status port; 52 } *status; /* buffer for status reports */ 53 struct mutex status_mutex; /* for the status buffer */ 54 55 int error; /* last reported error */ 56 int nerrors; /* track consecutive errors */ 57 58 struct list_head event_list; /* hubs w/data or errs ready */ 59 unsigned long event_bits[1]; /* status change bitmask */ 60 unsigned long change_bits[1]; /* ports with logical connect 61 status change */ 62 unsigned long busy_bits[1]; /* ports being reset or 63 resumed */ 64 #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ 65 #error event_bits[] is too short! 66 #endif 67 68 struct usb_hub_descriptor *descriptor; /* class descriptor */ 69 struct usb_tt tt; /* Transaction Translator */ 70 71 unsigned mA_per_port; /* current for each child */ 72 73 unsigned limited_power:1; 74 unsigned quiescing:1; 75 unsigned activating:1; 76 unsigned disconnected:1; 77 78 unsigned has_indicators:1; 79 u8 indicator[USB_MAXCHILDREN]; 80 struct delayed_work leds; 81 }; 82 83 84 /* Protect struct usb_device->state and ->children members 85 * Note: Both are also protected by ->dev.sem, except that ->state can 86 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 87 static DEFINE_SPINLOCK(device_state_lock); 88 89 /* khubd's worklist and its lock */ 90 static DEFINE_SPINLOCK(hub_event_lock); 91 static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ 92 93 /* Wakes up khubd */ 94 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); 95 96 static struct task_struct *khubd_task; 97 98 /* cycle leds on hubs that aren't blinking for attention */ 99 static int blinkenlights = 0; 100 module_param (blinkenlights, bool, S_IRUGO); 101 MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); 102 103 /* 104 * As of 2.6.10 we introduce a new USB device initialization scheme which 105 * closely resembles the way Windows works. Hopefully it will be compatible 106 * with a wider range of devices than the old scheme. However some previously 107 * working devices may start giving rise to "device not accepting address" 108 * errors; if that happens the user can try the old scheme by adjusting the 109 * following module parameters. 110 * 111 * For maximum flexibility there are two boolean parameters to control the 112 * hub driver's behavior. On the first initialization attempt, if the 113 * "old_scheme_first" parameter is set then the old scheme will be used, 114 * otherwise the new scheme is used. If that fails and "use_both_schemes" 115 * is set, then the driver will make another attempt, using the other scheme. 116 */ 117 static int old_scheme_first = 0; 118 module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 119 MODULE_PARM_DESC(old_scheme_first, 120 "start with the old device initialization scheme"); 121 122 static int use_both_schemes = 1; 123 module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 124 MODULE_PARM_DESC(use_both_schemes, 125 "try the other device initialization scheme if the " 126 "first one fails"); 127 128 129 static inline char *portspeed(int portstatus) 130 { 131 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) 132 return "480 Mb/s"; 133 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) 134 return "1.5 Mb/s"; 135 else 136 return "12 Mb/s"; 137 } 138 139 /* Note that hdev or one of its children must be locked! */ 140 static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev) 141 { 142 return usb_get_intfdata(hdev->actconfig->interface[0]); 143 } 144 145 /* USB 2.0 spec Section 11.24.4.5 */ 146 static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) 147 { 148 int i, ret; 149 150 for (i = 0; i < 3; i++) { 151 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 152 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 153 USB_DT_HUB << 8, 0, data, size, 154 USB_CTRL_GET_TIMEOUT); 155 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 156 return ret; 157 } 158 return -EINVAL; 159 } 160 161 /* 162 * USB 2.0 spec Section 11.24.2.1 163 */ 164 static int clear_hub_feature(struct usb_device *hdev, int feature) 165 { 166 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 167 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 168 } 169 170 /* 171 * USB 2.0 spec Section 11.24.2.2 172 */ 173 static int clear_port_feature(struct usb_device *hdev, int port1, int feature) 174 { 175 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 176 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 177 NULL, 0, 1000); 178 } 179 180 /* 181 * USB 2.0 spec Section 11.24.2.13 182 */ 183 static int set_port_feature(struct usb_device *hdev, int port1, int feature) 184 { 185 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 186 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 187 NULL, 0, 1000); 188 } 189 190 /* 191 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 192 * for info about using port indicators 193 */ 194 static void set_port_led( 195 struct usb_hub *hub, 196 int port1, 197 int selector 198 ) 199 { 200 int status = set_port_feature(hub->hdev, (selector << 8) | port1, 201 USB_PORT_FEAT_INDICATOR); 202 if (status < 0) 203 dev_dbg (hub->intfdev, 204 "port %d indicator %s status %d\n", 205 port1, 206 ({ char *s; switch (selector) { 207 case HUB_LED_AMBER: s = "amber"; break; 208 case HUB_LED_GREEN: s = "green"; break; 209 case HUB_LED_OFF: s = "off"; break; 210 case HUB_LED_AUTO: s = "auto"; break; 211 default: s = "??"; break; 212 }; s; }), 213 status); 214 } 215 216 #define LED_CYCLE_PERIOD ((2*HZ)/3) 217 218 static void led_work (struct work_struct *work) 219 { 220 struct usb_hub *hub = 221 container_of(work, struct usb_hub, leds.work); 222 struct usb_device *hdev = hub->hdev; 223 unsigned i; 224 unsigned changed = 0; 225 int cursor = -1; 226 227 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 228 return; 229 230 for (i = 0; i < hub->descriptor->bNbrPorts; i++) { 231 unsigned selector, mode; 232 233 /* 30%-50% duty cycle */ 234 235 switch (hub->indicator[i]) { 236 /* cycle marker */ 237 case INDICATOR_CYCLE: 238 cursor = i; 239 selector = HUB_LED_AUTO; 240 mode = INDICATOR_AUTO; 241 break; 242 /* blinking green = sw attention */ 243 case INDICATOR_GREEN_BLINK: 244 selector = HUB_LED_GREEN; 245 mode = INDICATOR_GREEN_BLINK_OFF; 246 break; 247 case INDICATOR_GREEN_BLINK_OFF: 248 selector = HUB_LED_OFF; 249 mode = INDICATOR_GREEN_BLINK; 250 break; 251 /* blinking amber = hw attention */ 252 case INDICATOR_AMBER_BLINK: 253 selector = HUB_LED_AMBER; 254 mode = INDICATOR_AMBER_BLINK_OFF; 255 break; 256 case INDICATOR_AMBER_BLINK_OFF: 257 selector = HUB_LED_OFF; 258 mode = INDICATOR_AMBER_BLINK; 259 break; 260 /* blink green/amber = reserved */ 261 case INDICATOR_ALT_BLINK: 262 selector = HUB_LED_GREEN; 263 mode = INDICATOR_ALT_BLINK_OFF; 264 break; 265 case INDICATOR_ALT_BLINK_OFF: 266 selector = HUB_LED_AMBER; 267 mode = INDICATOR_ALT_BLINK; 268 break; 269 default: 270 continue; 271 } 272 if (selector != HUB_LED_AUTO) 273 changed = 1; 274 set_port_led(hub, i + 1, selector); 275 hub->indicator[i] = mode; 276 } 277 if (!changed && blinkenlights) { 278 cursor++; 279 cursor %= hub->descriptor->bNbrPorts; 280 set_port_led(hub, cursor + 1, HUB_LED_GREEN); 281 hub->indicator[cursor] = INDICATOR_CYCLE; 282 changed++; 283 } 284 if (changed) 285 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 286 } 287 288 /* use a short timeout for hub/port status fetches */ 289 #define USB_STS_TIMEOUT 1000 290 #define USB_STS_RETRIES 5 291 292 /* 293 * USB 2.0 spec Section 11.24.2.6 294 */ 295 static int get_hub_status(struct usb_device *hdev, 296 struct usb_hub_status *data) 297 { 298 int i, status = -ETIMEDOUT; 299 300 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 301 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 302 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 303 data, sizeof(*data), USB_STS_TIMEOUT); 304 } 305 return status; 306 } 307 308 /* 309 * USB 2.0 spec Section 11.24.2.7 310 */ 311 static int get_port_status(struct usb_device *hdev, int port1, 312 struct usb_port_status *data) 313 { 314 int i, status = -ETIMEDOUT; 315 316 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { 317 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 318 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 319 data, sizeof(*data), USB_STS_TIMEOUT); 320 } 321 return status; 322 } 323 324 static void kick_khubd(struct usb_hub *hub) 325 { 326 unsigned long flags; 327 328 /* Suppress autosuspend until khubd runs */ 329 to_usb_interface(hub->intfdev)->pm_usage_cnt = 1; 330 331 spin_lock_irqsave(&hub_event_lock, flags); 332 if (!hub->disconnected & list_empty(&hub->event_list)) { 333 list_add_tail(&hub->event_list, &hub_event_list); 334 wake_up(&khubd_wait); 335 } 336 spin_unlock_irqrestore(&hub_event_lock, flags); 337 } 338 339 void usb_kick_khubd(struct usb_device *hdev) 340 { 341 /* FIXME: What if hdev isn't bound to the hub driver? */ 342 kick_khubd(hdev_to_hub(hdev)); 343 } 344 345 346 /* completion function, fires on port status changes and various faults */ 347 static void hub_irq(struct urb *urb) 348 { 349 struct usb_hub *hub = urb->context; 350 int status; 351 int i; 352 unsigned long bits; 353 354 switch (urb->status) { 355 case -ENOENT: /* synchronous unlink */ 356 case -ECONNRESET: /* async unlink */ 357 case -ESHUTDOWN: /* hardware going away */ 358 return; 359 360 default: /* presumably an error */ 361 /* Cause a hub reset after 10 consecutive errors */ 362 dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status); 363 if ((++hub->nerrors < 10) || hub->error) 364 goto resubmit; 365 hub->error = urb->status; 366 /* FALL THROUGH */ 367 368 /* let khubd handle things */ 369 case 0: /* we got data: port status changed */ 370 bits = 0; 371 for (i = 0; i < urb->actual_length; ++i) 372 bits |= ((unsigned long) ((*hub->buffer)[i])) 373 << (i*8); 374 hub->event_bits[0] = bits; 375 break; 376 } 377 378 hub->nerrors = 0; 379 380 /* Something happened, let khubd figure it out */ 381 kick_khubd(hub); 382 383 resubmit: 384 if (hub->quiescing) 385 return; 386 387 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 388 && status != -ENODEV && status != -EPERM) 389 dev_err (hub->intfdev, "resubmit --> %d\n", status); 390 } 391 392 /* USB 2.0 spec Section 11.24.2.3 */ 393 static inline int 394 hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) 395 { 396 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 397 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 398 tt, NULL, 0, 1000); 399 } 400 401 /* 402 * enumeration blocks khubd for a long time. we use keventd instead, since 403 * long blocking there is the exception, not the rule. accordingly, HCDs 404 * talking to TTs must queue control transfers (not just bulk and iso), so 405 * both can talk to the same hub concurrently. 406 */ 407 static void hub_tt_kevent (struct work_struct *work) 408 { 409 struct usb_hub *hub = 410 container_of(work, struct usb_hub, tt.kevent); 411 unsigned long flags; 412 int limit = 100; 413 414 spin_lock_irqsave (&hub->tt.lock, flags); 415 while (--limit && !list_empty (&hub->tt.clear_list)) { 416 struct list_head *temp; 417 struct usb_tt_clear *clear; 418 struct usb_device *hdev = hub->hdev; 419 int status; 420 421 temp = hub->tt.clear_list.next; 422 clear = list_entry (temp, struct usb_tt_clear, clear_list); 423 list_del (&clear->clear_list); 424 425 /* drop lock so HCD can concurrently report other TT errors */ 426 spin_unlock_irqrestore (&hub->tt.lock, flags); 427 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 428 spin_lock_irqsave (&hub->tt.lock, flags); 429 430 if (status) 431 dev_err (&hdev->dev, 432 "clear tt %d (%04x) error %d\n", 433 clear->tt, clear->devinfo, status); 434 kfree(clear); 435 } 436 spin_unlock_irqrestore (&hub->tt.lock, flags); 437 } 438 439 /** 440 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub 441 * @udev: the device whose split transaction failed 442 * @pipe: identifies the endpoint of the failed transaction 443 * 444 * High speed HCDs use this to tell the hub driver that some split control or 445 * bulk transaction failed in a way that requires clearing internal state of 446 * a transaction translator. This is normally detected (and reported) from 447 * interrupt context. 448 * 449 * It may not be possible for that hub to handle additional full (or low) 450 * speed transactions until that state is fully cleared out. 451 */ 452 void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe) 453 { 454 struct usb_tt *tt = udev->tt; 455 unsigned long flags; 456 struct usb_tt_clear *clear; 457 458 /* we've got to cope with an arbitrary number of pending TT clears, 459 * since each TT has "at least two" buffers that can need it (and 460 * there can be many TTs per hub). even if they're uncommon. 461 */ 462 if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { 463 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 464 /* FIXME recover somehow ... RESET_TT? */ 465 return; 466 } 467 468 /* info that CLEAR_TT_BUFFER needs */ 469 clear->tt = tt->multi ? udev->ttport : 1; 470 clear->devinfo = usb_pipeendpoint (pipe); 471 clear->devinfo |= udev->devnum << 4; 472 clear->devinfo |= usb_pipecontrol (pipe) 473 ? (USB_ENDPOINT_XFER_CONTROL << 11) 474 : (USB_ENDPOINT_XFER_BULK << 11); 475 if (usb_pipein (pipe)) 476 clear->devinfo |= 1 << 15; 477 478 /* tell keventd to clear state for this TT */ 479 spin_lock_irqsave (&tt->lock, flags); 480 list_add_tail (&clear->clear_list, &tt->clear_list); 481 schedule_work (&tt->kevent); 482 spin_unlock_irqrestore (&tt->lock, flags); 483 } 484 485 static void hub_power_on(struct usb_hub *hub) 486 { 487 int port1; 488 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 489 u16 wHubCharacteristics = 490 le16_to_cpu(hub->descriptor->wHubCharacteristics); 491 492 /* Enable power on each port. Some hubs have reserved values 493 * of LPSM (> 2) in their descriptors, even though they are 494 * USB 2.0 hubs. Some hubs do not implement port-power switching 495 * but only emulate it. In all cases, the ports won't work 496 * unless we send these messages to the hub. 497 */ 498 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) 499 dev_dbg(hub->intfdev, "enabling power on all ports\n"); 500 else 501 dev_dbg(hub->intfdev, "trying to enable port power on " 502 "non-switchable hub\n"); 503 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) 504 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 505 506 /* Wait at least 100 msec for power to become stable */ 507 msleep(max(pgood_delay, (unsigned) 100)); 508 } 509 510 static void hub_quiesce(struct usb_hub *hub) 511 { 512 /* (nonblocking) khubd and related activity won't re-trigger */ 513 hub->quiescing = 1; 514 hub->activating = 0; 515 516 /* (blocking) stop khubd and related activity */ 517 usb_kill_urb(hub->urb); 518 if (hub->has_indicators) 519 cancel_delayed_work(&hub->leds); 520 if (hub->has_indicators || hub->tt.hub) 521 flush_scheduled_work(); 522 } 523 524 static void hub_activate(struct usb_hub *hub) 525 { 526 int status; 527 528 hub->quiescing = 0; 529 hub->activating = 1; 530 531 status = usb_submit_urb(hub->urb, GFP_NOIO); 532 if (status < 0) 533 dev_err(hub->intfdev, "activate --> %d\n", status); 534 if (hub->has_indicators && blinkenlights) 535 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 536 537 /* scan all ports ASAP */ 538 kick_khubd(hub); 539 } 540 541 static int hub_hub_status(struct usb_hub *hub, 542 u16 *status, u16 *change) 543 { 544 int ret; 545 546 mutex_lock(&hub->status_mutex); 547 ret = get_hub_status(hub->hdev, &hub->status->hub); 548 if (ret < 0) 549 dev_err (hub->intfdev, 550 "%s failed (err = %d)\n", __FUNCTION__, ret); 551 else { 552 *status = le16_to_cpu(hub->status->hub.wHubStatus); 553 *change = le16_to_cpu(hub->status->hub.wHubChange); 554 ret = 0; 555 } 556 mutex_unlock(&hub->status_mutex); 557 return ret; 558 } 559 560 static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 561 { 562 struct usb_device *hdev = hub->hdev; 563 int ret = 0; 564 565 if (hdev->children[port1-1] && set_state) 566 usb_set_device_state(hdev->children[port1-1], 567 USB_STATE_NOTATTACHED); 568 if (!hub->error) 569 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); 570 if (ret) 571 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 572 port1, ret); 573 return ret; 574 } 575 576 /* 577 * Disable a port and mark a logical connnect-change event, so that some 578 * time later khubd will disconnect() any existing usb_device on the port 579 * and will re-enumerate if there actually is a device attached. 580 */ 581 static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 582 { 583 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 584 hub_port_disable(hub, port1, 1); 585 586 /* FIXME let caller ask to power down the port: 587 * - some devices won't enumerate without a VBUS power cycle 588 * - SRP saves power that way 589 * - ... new call, TBD ... 590 * That's easy if this hub can switch power per-port, and 591 * khubd reactivates the port later (timer, SRP, etc). 592 * Powerdown must be optional, because of reset/DFU. 593 */ 594 595 set_bit(port1, hub->change_bits); 596 kick_khubd(hub); 597 } 598 599 /* caller has locked the hub device */ 600 static int hub_pre_reset(struct usb_interface *intf) 601 { 602 struct usb_hub *hub = usb_get_intfdata(intf); 603 struct usb_device *hdev = hub->hdev; 604 int i; 605 606 /* Disconnect all the children */ 607 for (i = 0; i < hdev->maxchild; ++i) { 608 if (hdev->children[i]) 609 usb_disconnect(&hdev->children[i]); 610 } 611 hub_quiesce(hub); 612 return 0; 613 } 614 615 /* caller has locked the hub device */ 616 static int hub_post_reset(struct usb_interface *intf) 617 { 618 struct usb_hub *hub = usb_get_intfdata(intf); 619 620 hub_power_on(hub); 621 hub_activate(hub); 622 return 0; 623 } 624 625 static int hub_configure(struct usb_hub *hub, 626 struct usb_endpoint_descriptor *endpoint) 627 { 628 struct usb_device *hdev = hub->hdev; 629 struct device *hub_dev = hub->intfdev; 630 u16 hubstatus, hubchange; 631 u16 wHubCharacteristics; 632 unsigned int pipe; 633 int maxp, ret; 634 char *message; 635 636 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL, 637 &hub->buffer_dma); 638 if (!hub->buffer) { 639 message = "can't allocate hub irq buffer"; 640 ret = -ENOMEM; 641 goto fail; 642 } 643 644 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 645 if (!hub->status) { 646 message = "can't kmalloc hub status buffer"; 647 ret = -ENOMEM; 648 goto fail; 649 } 650 mutex_init(&hub->status_mutex); 651 652 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 653 if (!hub->descriptor) { 654 message = "can't kmalloc hub descriptor"; 655 ret = -ENOMEM; 656 goto fail; 657 } 658 659 /* Request the entire hub descriptor. 660 * hub->descriptor can handle USB_MAXCHILDREN ports, 661 * but the hub can/will return fewer bytes here. 662 */ 663 ret = get_hub_descriptor(hdev, hub->descriptor, 664 sizeof(*hub->descriptor)); 665 if (ret < 0) { 666 message = "can't read hub descriptor"; 667 goto fail; 668 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 669 message = "hub has too many ports!"; 670 ret = -ENODEV; 671 goto fail; 672 } 673 674 hdev->maxchild = hub->descriptor->bNbrPorts; 675 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 676 (hdev->maxchild == 1) ? "" : "s"); 677 678 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 679 680 if (wHubCharacteristics & HUB_CHAR_COMPOUND) { 681 int i; 682 char portstr [USB_MAXCHILDREN + 1]; 683 684 for (i = 0; i < hdev->maxchild; i++) 685 portstr[i] = hub->descriptor->DeviceRemovable 686 [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 687 ? 'F' : 'R'; 688 portstr[hdev->maxchild] = 0; 689 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 690 } else 691 dev_dbg(hub_dev, "standalone hub\n"); 692 693 switch (wHubCharacteristics & HUB_CHAR_LPSM) { 694 case 0x00: 695 dev_dbg(hub_dev, "ganged power switching\n"); 696 break; 697 case 0x01: 698 dev_dbg(hub_dev, "individual port power switching\n"); 699 break; 700 case 0x02: 701 case 0x03: 702 dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 703 break; 704 } 705 706 switch (wHubCharacteristics & HUB_CHAR_OCPM) { 707 case 0x00: 708 dev_dbg(hub_dev, "global over-current protection\n"); 709 break; 710 case 0x08: 711 dev_dbg(hub_dev, "individual port over-current protection\n"); 712 break; 713 case 0x10: 714 case 0x18: 715 dev_dbg(hub_dev, "no over-current protection\n"); 716 break; 717 } 718 719 spin_lock_init (&hub->tt.lock); 720 INIT_LIST_HEAD (&hub->tt.clear_list); 721 INIT_WORK (&hub->tt.kevent, hub_tt_kevent); 722 switch (hdev->descriptor.bDeviceProtocol) { 723 case 0: 724 break; 725 case 1: 726 dev_dbg(hub_dev, "Single TT\n"); 727 hub->tt.hub = hdev; 728 break; 729 case 2: 730 ret = usb_set_interface(hdev, 0, 1); 731 if (ret == 0) { 732 dev_dbg(hub_dev, "TT per port\n"); 733 hub->tt.multi = 1; 734 } else 735 dev_err(hub_dev, "Using single TT (err %d)\n", 736 ret); 737 hub->tt.hub = hdev; 738 break; 739 default: 740 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 741 hdev->descriptor.bDeviceProtocol); 742 break; 743 } 744 745 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 746 switch (wHubCharacteristics & HUB_CHAR_TTTT) { 747 case HUB_TTTT_8_BITS: 748 if (hdev->descriptor.bDeviceProtocol != 0) { 749 hub->tt.think_time = 666; 750 dev_dbg(hub_dev, "TT requires at most %d " 751 "FS bit times (%d ns)\n", 752 8, hub->tt.think_time); 753 } 754 break; 755 case HUB_TTTT_16_BITS: 756 hub->tt.think_time = 666 * 2; 757 dev_dbg(hub_dev, "TT requires at most %d " 758 "FS bit times (%d ns)\n", 759 16, hub->tt.think_time); 760 break; 761 case HUB_TTTT_24_BITS: 762 hub->tt.think_time = 666 * 3; 763 dev_dbg(hub_dev, "TT requires at most %d " 764 "FS bit times (%d ns)\n", 765 24, hub->tt.think_time); 766 break; 767 case HUB_TTTT_32_BITS: 768 hub->tt.think_time = 666 * 4; 769 dev_dbg(hub_dev, "TT requires at most %d " 770 "FS bit times (%d ns)\n", 771 32, hub->tt.think_time); 772 break; 773 } 774 775 /* probe() zeroes hub->indicator[] */ 776 if (wHubCharacteristics & HUB_CHAR_PORTIND) { 777 hub->has_indicators = 1; 778 dev_dbg(hub_dev, "Port indicators are supported\n"); 779 } 780 781 dev_dbg(hub_dev, "power on to power good time: %dms\n", 782 hub->descriptor->bPwrOn2PwrGood * 2); 783 784 /* power budgeting mostly matters with bus-powered hubs, 785 * and battery-powered root hubs (may provide just 8 mA). 786 */ 787 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 788 if (ret < 2) { 789 message = "can't get hub status"; 790 goto fail; 791 } 792 le16_to_cpus(&hubstatus); 793 if (hdev == hdev->bus->root_hub) { 794 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) 795 hub->mA_per_port = 500; 796 else { 797 hub->mA_per_port = hdev->bus_mA; 798 hub->limited_power = 1; 799 } 800 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 801 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 802 hub->descriptor->bHubContrCurrent); 803 hub->limited_power = 1; 804 if (hdev->maxchild > 0) { 805 int remaining = hdev->bus_mA - 806 hub->descriptor->bHubContrCurrent; 807 808 if (remaining < hdev->maxchild * 100) 809 dev_warn(hub_dev, 810 "insufficient power available " 811 "to use all downstream ports\n"); 812 hub->mA_per_port = 100; /* 7.2.1.1 */ 813 } 814 } else { /* Self-powered external hub */ 815 /* FIXME: What about battery-powered external hubs that 816 * provide less current per port? */ 817 hub->mA_per_port = 500; 818 } 819 if (hub->mA_per_port < 500) 820 dev_dbg(hub_dev, "%umA bus power budget for each child\n", 821 hub->mA_per_port); 822 823 ret = hub_hub_status(hub, &hubstatus, &hubchange); 824 if (ret < 0) { 825 message = "can't get hub status"; 826 goto fail; 827 } 828 829 /* local power status reports aren't always correct */ 830 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 831 dev_dbg(hub_dev, "local power source is %s\n", 832 (hubstatus & HUB_STATUS_LOCAL_POWER) 833 ? "lost (inactive)" : "good"); 834 835 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 836 dev_dbg(hub_dev, "%sover-current condition exists\n", 837 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 838 839 /* set up the interrupt endpoint 840 * We use the EP's maxpacket size instead of (PORTS+1+7)/8 841 * bytes as USB2.0[11.12.3] says because some hubs are known 842 * to send more data (and thus cause overflow). For root hubs, 843 * maxpktsize is defined in hcd.c's fake endpoint descriptors 844 * to be big enough for at least USB_MAXCHILDREN ports. */ 845 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 846 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 847 848 if (maxp > sizeof(*hub->buffer)) 849 maxp = sizeof(*hub->buffer); 850 851 hub->urb = usb_alloc_urb(0, GFP_KERNEL); 852 if (!hub->urb) { 853 message = "couldn't allocate interrupt urb"; 854 ret = -ENOMEM; 855 goto fail; 856 } 857 858 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 859 hub, endpoint->bInterval); 860 hub->urb->transfer_dma = hub->buffer_dma; 861 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 862 863 /* maybe cycle the hub leds */ 864 if (hub->has_indicators && blinkenlights) 865 hub->indicator [0] = INDICATOR_CYCLE; 866 867 hub_power_on(hub); 868 hub_activate(hub); 869 return 0; 870 871 fail: 872 dev_err (hub_dev, "config failed, %s (err %d)\n", 873 message, ret); 874 /* hub_disconnect() frees urb and descriptor */ 875 return ret; 876 } 877 878 static void hub_release(struct kref *kref) 879 { 880 struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 881 882 usb_put_intf(to_usb_interface(hub->intfdev)); 883 kfree(hub); 884 } 885 886 static unsigned highspeed_hubs; 887 888 static void hub_disconnect(struct usb_interface *intf) 889 { 890 struct usb_hub *hub = usb_get_intfdata (intf); 891 892 /* Take the hub off the event list and don't let it be added again */ 893 spin_lock_irq(&hub_event_lock); 894 list_del_init(&hub->event_list); 895 hub->disconnected = 1; 896 spin_unlock_irq(&hub_event_lock); 897 898 /* Disconnect all children and quiesce the hub */ 899 hub->error = 0; 900 hub_pre_reset(intf); 901 902 usb_set_intfdata (intf, NULL); 903 904 if (hub->hdev->speed == USB_SPEED_HIGH) 905 highspeed_hubs--; 906 907 usb_free_urb(hub->urb); 908 kfree(hub->descriptor); 909 kfree(hub->status); 910 usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer, 911 hub->buffer_dma); 912 913 kref_put(&hub->kref, hub_release); 914 } 915 916 static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 917 { 918 struct usb_host_interface *desc; 919 struct usb_endpoint_descriptor *endpoint; 920 struct usb_device *hdev; 921 struct usb_hub *hub; 922 923 desc = intf->cur_altsetting; 924 hdev = interface_to_usbdev(intf); 925 926 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 927 if (hdev->parent) { 928 dev_warn(&intf->dev, "ignoring external hub\n"); 929 return -ENODEV; 930 } 931 #endif 932 933 /* Some hubs have a subclass of 1, which AFAICT according to the */ 934 /* specs is not defined, but it works */ 935 if ((desc->desc.bInterfaceSubClass != 0) && 936 (desc->desc.bInterfaceSubClass != 1)) { 937 descriptor_error: 938 dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 939 return -EIO; 940 } 941 942 /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 943 if (desc->desc.bNumEndpoints != 1) 944 goto descriptor_error; 945 946 endpoint = &desc->endpoint[0].desc; 947 948 /* If it's not an interrupt in endpoint, we'd better punt! */ 949 if (!usb_endpoint_is_int_in(endpoint)) 950 goto descriptor_error; 951 952 /* We found a hub */ 953 dev_info (&intf->dev, "USB hub found\n"); 954 955 hub = kzalloc(sizeof(*hub), GFP_KERNEL); 956 if (!hub) { 957 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 958 return -ENOMEM; 959 } 960 961 kref_init(&hub->kref); 962 INIT_LIST_HEAD(&hub->event_list); 963 hub->intfdev = &intf->dev; 964 hub->hdev = hdev; 965 INIT_DELAYED_WORK(&hub->leds, led_work); 966 usb_get_intf(intf); 967 968 usb_set_intfdata (intf, hub); 969 intf->needs_remote_wakeup = 1; 970 971 if (hdev->speed == USB_SPEED_HIGH) 972 highspeed_hubs++; 973 974 if (hub_configure(hub, endpoint) >= 0) 975 return 0; 976 977 hub_disconnect (intf); 978 return -ENODEV; 979 } 980 981 static int 982 hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 983 { 984 struct usb_device *hdev = interface_to_usbdev (intf); 985 986 /* assert ifno == 0 (part of hub spec) */ 987 switch (code) { 988 case USBDEVFS_HUB_PORTINFO: { 989 struct usbdevfs_hub_portinfo *info = user_data; 990 int i; 991 992 spin_lock_irq(&device_state_lock); 993 if (hdev->devnum <= 0) 994 info->nports = 0; 995 else { 996 info->nports = hdev->maxchild; 997 for (i = 0; i < info->nports; i++) { 998 if (hdev->children[i] == NULL) 999 info->port[i] = 0; 1000 else 1001 info->port[i] = 1002 hdev->children[i]->devnum; 1003 } 1004 } 1005 spin_unlock_irq(&device_state_lock); 1006 1007 return info->nports + 1; 1008 } 1009 1010 default: 1011 return -ENOSYS; 1012 } 1013 } 1014 1015 1016 static void recursively_mark_NOTATTACHED(struct usb_device *udev) 1017 { 1018 int i; 1019 1020 for (i = 0; i < udev->maxchild; ++i) { 1021 if (udev->children[i]) 1022 recursively_mark_NOTATTACHED(udev->children[i]); 1023 } 1024 if (udev->state == USB_STATE_SUSPENDED) 1025 udev->discon_suspended = 1; 1026 udev->state = USB_STATE_NOTATTACHED; 1027 } 1028 1029 /** 1030 * usb_set_device_state - change a device's current state (usbcore, hcds) 1031 * @udev: pointer to device whose state should be changed 1032 * @new_state: new state value to be stored 1033 * 1034 * udev->state is _not_ fully protected by the device lock. Although 1035 * most transitions are made only while holding the lock, the state can 1036 * can change to USB_STATE_NOTATTACHED at almost any time. This 1037 * is so that devices can be marked as disconnected as soon as possible, 1038 * without having to wait for any semaphores to be released. As a result, 1039 * all changes to any device's state must be protected by the 1040 * device_state_lock spinlock. 1041 * 1042 * Once a device has been added to the device tree, all changes to its state 1043 * should be made using this routine. The state should _not_ be set directly. 1044 * 1045 * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 1046 * Otherwise udev->state is set to new_state, and if new_state is 1047 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 1048 * to USB_STATE_NOTATTACHED. 1049 */ 1050 void usb_set_device_state(struct usb_device *udev, 1051 enum usb_device_state new_state) 1052 { 1053 unsigned long flags; 1054 1055 spin_lock_irqsave(&device_state_lock, flags); 1056 if (udev->state == USB_STATE_NOTATTACHED) 1057 ; /* do nothing */ 1058 else if (new_state != USB_STATE_NOTATTACHED) { 1059 1060 /* root hub wakeup capabilities are managed out-of-band 1061 * and may involve silicon errata ... ignore them here. 1062 */ 1063 if (udev->parent) { 1064 if (udev->state == USB_STATE_SUSPENDED 1065 || new_state == USB_STATE_SUSPENDED) 1066 ; /* No change to wakeup settings */ 1067 else if (new_state == USB_STATE_CONFIGURED) 1068 device_init_wakeup(&udev->dev, 1069 (udev->actconfig->desc.bmAttributes 1070 & USB_CONFIG_ATT_WAKEUP)); 1071 else 1072 device_init_wakeup(&udev->dev, 0); 1073 } 1074 udev->state = new_state; 1075 } else 1076 recursively_mark_NOTATTACHED(udev); 1077 spin_unlock_irqrestore(&device_state_lock, flags); 1078 } 1079 1080 static void choose_address(struct usb_device *udev) 1081 { 1082 int devnum; 1083 struct usb_bus *bus = udev->bus; 1084 1085 /* If khubd ever becomes multithreaded, this will need a lock */ 1086 1087 /* Try to allocate the next devnum beginning at bus->devnum_next. */ 1088 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1089 bus->devnum_next); 1090 if (devnum >= 128) 1091 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1); 1092 1093 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); 1094 1095 if (devnum < 128) { 1096 set_bit(devnum, bus->devmap.devicemap); 1097 udev->devnum = devnum; 1098 } 1099 } 1100 1101 static void release_address(struct usb_device *udev) 1102 { 1103 if (udev->devnum > 0) { 1104 clear_bit(udev->devnum, udev->bus->devmap.devicemap); 1105 udev->devnum = -1; 1106 } 1107 } 1108 1109 #ifdef CONFIG_USB_SUSPEND 1110 1111 static void usb_stop_pm(struct usb_device *udev) 1112 { 1113 /* Synchronize with the ksuspend thread to prevent any more 1114 * autosuspend requests from being submitted, and decrement 1115 * the parent's count of unsuspended children. 1116 */ 1117 usb_pm_lock(udev); 1118 if (udev->parent && !udev->discon_suspended) 1119 usb_autosuspend_device(udev->parent); 1120 usb_pm_unlock(udev); 1121 1122 /* Stop any autosuspend requests already submitted */ 1123 cancel_rearming_delayed_work(&udev->autosuspend); 1124 } 1125 1126 #else 1127 1128 static inline void usb_stop_pm(struct usb_device *udev) 1129 { } 1130 1131 #endif 1132 1133 /** 1134 * usb_disconnect - disconnect a device (usbcore-internal) 1135 * @pdev: pointer to device being disconnected 1136 * Context: !in_interrupt () 1137 * 1138 * Something got disconnected. Get rid of it and all of its children. 1139 * 1140 * If *pdev is a normal device then the parent hub must already be locked. 1141 * If *pdev is a root hub then this routine will acquire the 1142 * usb_bus_list_lock on behalf of the caller. 1143 * 1144 * Only hub drivers (including virtual root hub drivers for host 1145 * controllers) should ever call this. 1146 * 1147 * This call is synchronous, and may not be used in an interrupt context. 1148 */ 1149 void usb_disconnect(struct usb_device **pdev) 1150 { 1151 struct usb_device *udev = *pdev; 1152 int i; 1153 1154 if (!udev) { 1155 pr_debug ("%s nodev\n", __FUNCTION__); 1156 return; 1157 } 1158 1159 /* mark the device as inactive, so any further urb submissions for 1160 * this device (and any of its children) will fail immediately. 1161 * this quiesces everyting except pending urbs. 1162 */ 1163 usb_set_device_state(udev, USB_STATE_NOTATTACHED); 1164 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); 1165 1166 usb_lock_device(udev); 1167 1168 /* Free up all the children before we remove this device */ 1169 for (i = 0; i < USB_MAXCHILDREN; i++) { 1170 if (udev->children[i]) 1171 usb_disconnect(&udev->children[i]); 1172 } 1173 1174 /* deallocate hcd/hardware state ... nuking all pending urbs and 1175 * cleaning up all state associated with the current configuration 1176 * so that the hardware is now fully quiesced. 1177 */ 1178 dev_dbg (&udev->dev, "unregistering device\n"); 1179 usb_disable_device(udev, 0); 1180 1181 usb_unlock_device(udev); 1182 1183 /* Unregister the device. The device driver is responsible 1184 * for removing the device files from usbfs and sysfs and for 1185 * de-configuring the device. 1186 */ 1187 device_del(&udev->dev); 1188 1189 /* Free the device number and delete the parent's children[] 1190 * (or root_hub) pointer. 1191 */ 1192 release_address(udev); 1193 1194 /* Avoid races with recursively_mark_NOTATTACHED() */ 1195 spin_lock_irq(&device_state_lock); 1196 *pdev = NULL; 1197 spin_unlock_irq(&device_state_lock); 1198 1199 usb_stop_pm(udev); 1200 1201 put_device(&udev->dev); 1202 } 1203 1204 #ifdef DEBUG 1205 static void show_string(struct usb_device *udev, char *id, char *string) 1206 { 1207 if (!string) 1208 return; 1209 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); 1210 } 1211 1212 #else 1213 static inline void show_string(struct usb_device *udev, char *id, char *string) 1214 {} 1215 #endif 1216 1217 1218 #ifdef CONFIG_USB_OTG 1219 #include "otg_whitelist.h" 1220 #endif 1221 1222 /** 1223 * usb_new_device - perform initial device setup (usbcore-internal) 1224 * @udev: newly addressed device (in ADDRESS state) 1225 * 1226 * This is called with devices which have been enumerated, but not yet 1227 * configured. The device descriptor is available, but not descriptors 1228 * for any device configuration. The caller must have locked either 1229 * the parent hub (if udev is a normal device) or else the 1230 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 1231 * udev has already been installed, but udev is not yet visible through 1232 * sysfs or other filesystem code. 1233 * 1234 * It will return if the device is configured properly or not. Zero if 1235 * the interface was registered with the driver core; else a negative 1236 * errno value. 1237 * 1238 * This call is synchronous, and may not be used in an interrupt context. 1239 * 1240 * Only the hub driver or root-hub registrar should ever call this. 1241 */ 1242 int usb_new_device(struct usb_device *udev) 1243 { 1244 int err; 1245 1246 /* Determine quirks */ 1247 usb_detect_quirks(udev); 1248 1249 err = usb_get_configuration(udev); 1250 if (err < 0) { 1251 dev_err(&udev->dev, "can't read configurations, error %d\n", 1252 err); 1253 goto fail; 1254 } 1255 1256 /* read the standard strings and cache them if present */ 1257 udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 1258 udev->manufacturer = usb_cache_string(udev, 1259 udev->descriptor.iManufacturer); 1260 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 1261 1262 /* Tell the world! */ 1263 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, " 1264 "SerialNumber=%d\n", 1265 udev->descriptor.iManufacturer, 1266 udev->descriptor.iProduct, 1267 udev->descriptor.iSerialNumber); 1268 show_string(udev, "Product", udev->product); 1269 show_string(udev, "Manufacturer", udev->manufacturer); 1270 show_string(udev, "SerialNumber", udev->serial); 1271 1272 #ifdef CONFIG_USB_OTG 1273 /* 1274 * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 1275 * to wake us after we've powered off VBUS; and HNP, switching roles 1276 * "host" to "peripheral". The OTG descriptor helps figure this out. 1277 */ 1278 if (!udev->bus->is_b_host 1279 && udev->config 1280 && udev->parent == udev->bus->root_hub) { 1281 struct usb_otg_descriptor *desc = 0; 1282 struct usb_bus *bus = udev->bus; 1283 1284 /* descriptor may appear anywhere in config */ 1285 if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 1286 le16_to_cpu(udev->config[0].desc.wTotalLength), 1287 USB_DT_OTG, (void **) &desc) == 0) { 1288 if (desc->bmAttributes & USB_OTG_HNP) { 1289 unsigned port1 = udev->portnum; 1290 1291 dev_info(&udev->dev, 1292 "Dual-Role OTG device on %sHNP port\n", 1293 (port1 == bus->otg_port) 1294 ? "" : "non-"); 1295 1296 /* enable HNP before suspend, it's simpler */ 1297 if (port1 == bus->otg_port) 1298 bus->b_hnp_enable = 1; 1299 err = usb_control_msg(udev, 1300 usb_sndctrlpipe(udev, 0), 1301 USB_REQ_SET_FEATURE, 0, 1302 bus->b_hnp_enable 1303 ? USB_DEVICE_B_HNP_ENABLE 1304 : USB_DEVICE_A_ALT_HNP_SUPPORT, 1305 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 1306 if (err < 0) { 1307 /* OTG MESSAGE: report errors here, 1308 * customize to match your product. 1309 */ 1310 dev_info(&udev->dev, 1311 "can't set HNP mode; %d\n", 1312 err); 1313 bus->b_hnp_enable = 0; 1314 } 1315 } 1316 } 1317 } 1318 1319 if (!is_targeted(udev)) { 1320 1321 /* Maybe it can talk to us, though we can't talk to it. 1322 * (Includes HNP test device.) 1323 */ 1324 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 1325 err = usb_port_suspend(udev); 1326 if (err < 0) 1327 dev_dbg(&udev->dev, "HNP fail, %d\n", err); 1328 } 1329 err = -ENOTSUPP; 1330 goto fail; 1331 } 1332 #endif 1333 1334 /* export the usbdev device-node for libusb */ 1335 udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 1336 (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 1337 1338 /* Increment the parent's count of unsuspended children */ 1339 if (udev->parent) 1340 usb_autoresume_device(udev->parent); 1341 1342 /* Register the device. The device driver is responsible 1343 * for adding the device files to sysfs and for configuring 1344 * the device. 1345 */ 1346 err = device_add(&udev->dev); 1347 if (err) { 1348 dev_err(&udev->dev, "can't device_add, error %d\n", err); 1349 if (udev->parent) 1350 usb_autosuspend_device(udev->parent); 1351 goto fail; 1352 } 1353 1354 exit: 1355 return err; 1356 1357 fail: 1358 usb_set_device_state(udev, USB_STATE_NOTATTACHED); 1359 goto exit; 1360 } 1361 1362 static int hub_port_status(struct usb_hub *hub, int port1, 1363 u16 *status, u16 *change) 1364 { 1365 int ret; 1366 1367 mutex_lock(&hub->status_mutex); 1368 ret = get_port_status(hub->hdev, port1, &hub->status->port); 1369 if (ret < 4) { 1370 dev_err (hub->intfdev, 1371 "%s failed (err = %d)\n", __FUNCTION__, ret); 1372 if (ret >= 0) 1373 ret = -EIO; 1374 } else { 1375 *status = le16_to_cpu(hub->status->port.wPortStatus); 1376 *change = le16_to_cpu(hub->status->port.wPortChange); 1377 ret = 0; 1378 } 1379 mutex_unlock(&hub->status_mutex); 1380 return ret; 1381 } 1382 1383 1384 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 1385 static unsigned hub_is_wusb(struct usb_hub *hub) 1386 { 1387 struct usb_hcd *hcd; 1388 if (hub->hdev->parent != NULL) /* not a root hub? */ 1389 return 0; 1390 hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 1391 return hcd->wireless; 1392 } 1393 1394 1395 #define PORT_RESET_TRIES 5 1396 #define SET_ADDRESS_TRIES 2 1397 #define GET_DESCRIPTOR_TRIES 2 1398 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 1399 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) 1400 1401 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 1402 #define HUB_SHORT_RESET_TIME 10 1403 #define HUB_LONG_RESET_TIME 200 1404 #define HUB_RESET_TIMEOUT 500 1405 1406 static int hub_port_wait_reset(struct usb_hub *hub, int port1, 1407 struct usb_device *udev, unsigned int delay) 1408 { 1409 int delay_time, ret; 1410 u16 portstatus; 1411 u16 portchange; 1412 1413 for (delay_time = 0; 1414 delay_time < HUB_RESET_TIMEOUT; 1415 delay_time += delay) { 1416 /* wait to give the device a chance to reset */ 1417 msleep(delay); 1418 1419 /* read and decode port status */ 1420 ret = hub_port_status(hub, port1, &portstatus, &portchange); 1421 if (ret < 0) 1422 return ret; 1423 1424 /* Device went away? */ 1425 if (!(portstatus & USB_PORT_STAT_CONNECTION)) 1426 return -ENOTCONN; 1427 1428 /* bomb out completely if the connection bounced */ 1429 if ((portchange & USB_PORT_STAT_C_CONNECTION)) 1430 return -ENOTCONN; 1431 1432 /* if we`ve finished resetting, then break out of the loop */ 1433 if (!(portstatus & USB_PORT_STAT_RESET) && 1434 (portstatus & USB_PORT_STAT_ENABLE)) { 1435 if (hub_is_wusb(hub)) 1436 udev->speed = USB_SPEED_VARIABLE; 1437 else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 1438 udev->speed = USB_SPEED_HIGH; 1439 else if (portstatus & USB_PORT_STAT_LOW_SPEED) 1440 udev->speed = USB_SPEED_LOW; 1441 else 1442 udev->speed = USB_SPEED_FULL; 1443 return 0; 1444 } 1445 1446 /* switch to the long delay after two short delay failures */ 1447 if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 1448 delay = HUB_LONG_RESET_TIME; 1449 1450 dev_dbg (hub->intfdev, 1451 "port %d not reset yet, waiting %dms\n", 1452 port1, delay); 1453 } 1454 1455 return -EBUSY; 1456 } 1457 1458 static int hub_port_reset(struct usb_hub *hub, int port1, 1459 struct usb_device *udev, unsigned int delay) 1460 { 1461 int i, status; 1462 1463 /* Reset the port */ 1464 for (i = 0; i < PORT_RESET_TRIES; i++) { 1465 status = set_port_feature(hub->hdev, 1466 port1, USB_PORT_FEAT_RESET); 1467 if (status) 1468 dev_err(hub->intfdev, 1469 "cannot reset port %d (err = %d)\n", 1470 port1, status); 1471 else { 1472 status = hub_port_wait_reset(hub, port1, udev, delay); 1473 if (status && status != -ENOTCONN) 1474 dev_dbg(hub->intfdev, 1475 "port_wait_reset: err = %d\n", 1476 status); 1477 } 1478 1479 /* return on disconnect or reset */ 1480 switch (status) { 1481 case 0: 1482 /* TRSTRCY = 10 ms; plus some extra */ 1483 msleep(10 + 40); 1484 /* FALL THROUGH */ 1485 case -ENOTCONN: 1486 case -ENODEV: 1487 clear_port_feature(hub->hdev, 1488 port1, USB_PORT_FEAT_C_RESET); 1489 /* FIXME need disconnect() for NOTATTACHED device */ 1490 usb_set_device_state(udev, status 1491 ? USB_STATE_NOTATTACHED 1492 : USB_STATE_DEFAULT); 1493 return status; 1494 } 1495 1496 dev_dbg (hub->intfdev, 1497 "port %d not enabled, trying reset again...\n", 1498 port1); 1499 delay = HUB_LONG_RESET_TIME; 1500 } 1501 1502 dev_err (hub->intfdev, 1503 "Cannot enable port %i. Maybe the USB cable is bad?\n", 1504 port1); 1505 1506 return status; 1507 } 1508 1509 #ifdef CONFIG_PM 1510 1511 #ifdef CONFIG_USB_SUSPEND 1512 1513 /* 1514 * usb_port_suspend - suspend a usb device's upstream port 1515 * @udev: device that's no longer in active use, not a root hub 1516 * Context: must be able to sleep; device not locked; pm locks held 1517 * 1518 * Suspends a USB device that isn't in active use, conserving power. 1519 * Devices may wake out of a suspend, if anything important happens, 1520 * using the remote wakeup mechanism. They may also be taken out of 1521 * suspend by the host, using usb_port_resume(). It's also routine 1522 * to disconnect devices while they are suspended. 1523 * 1524 * This only affects the USB hardware for a device; its interfaces 1525 * (and, for hubs, child devices) must already have been suspended. 1526 * 1527 * Selective port suspend reduces power; most suspended devices draw 1528 * less than 500 uA. It's also used in OTG, along with remote wakeup. 1529 * All devices below the suspended port are also suspended. 1530 * 1531 * Devices leave suspend state when the host wakes them up. Some devices 1532 * also support "remote wakeup", where the device can activate the USB 1533 * tree above them to deliver data, such as a keypress or packet. In 1534 * some cases, this wakes the USB host. 1535 * 1536 * Suspending OTG devices may trigger HNP, if that's been enabled 1537 * between a pair of dual-role devices. That will change roles, such 1538 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 1539 * 1540 * Devices on USB hub ports have only one "suspend" state, corresponding 1541 * to ACPI D2, "may cause the device to lose some context". 1542 * State transitions include: 1543 * 1544 * - suspend, resume ... when the VBUS power link stays live 1545 * - suspend, disconnect ... VBUS lost 1546 * 1547 * Once VBUS drop breaks the circuit, the port it's using has to go through 1548 * normal re-enumeration procedures, starting with enabling VBUS power. 1549 * Other than re-initializing the hub (plug/unplug, except for root hubs), 1550 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 1551 * timer, no SRP, no requests through sysfs. 1552 * 1553 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when 1554 * the root hub for their bus goes into global suspend ... so we don't 1555 * (falsely) update the device power state to say it suspended. 1556 * 1557 * Returns 0 on success, else negative errno. 1558 */ 1559 int usb_port_suspend(struct usb_device *udev) 1560 { 1561 struct usb_hub *hub = hdev_to_hub(udev->parent); 1562 int port1 = udev->portnum; 1563 int status; 1564 1565 // dev_dbg(hub->intfdev, "suspend port %d\n", port1); 1566 1567 /* enable remote wakeup when appropriate; this lets the device 1568 * wake up the upstream hub (including maybe the root hub). 1569 * 1570 * NOTE: OTG devices may issue remote wakeup (or SRP) even when 1571 * we don't explicitly enable it here. 1572 */ 1573 if (udev->do_remote_wakeup) { 1574 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 1575 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 1576 USB_DEVICE_REMOTE_WAKEUP, 0, 1577 NULL, 0, 1578 USB_CTRL_SET_TIMEOUT); 1579 if (status) 1580 dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 1581 status); 1582 } 1583 1584 /* see 7.1.7.6 */ 1585 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); 1586 if (status) { 1587 dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", 1588 port1, status); 1589 /* paranoia: "should not happen" */ 1590 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 1591 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 1592 USB_DEVICE_REMOTE_WAKEUP, 0, 1593 NULL, 0, 1594 USB_CTRL_SET_TIMEOUT); 1595 } else { 1596 /* device has up to 10 msec to fully suspend */ 1597 dev_dbg(&udev->dev, "usb %ssuspend\n", 1598 udev->auto_pm ? "auto-" : ""); 1599 usb_set_device_state(udev, USB_STATE_SUSPENDED); 1600 msleep(10); 1601 } 1602 return status; 1603 } 1604 1605 /* 1606 * If the USB "suspend" state is in use (rather than "global suspend"), 1607 * many devices will be individually taken out of suspend state using 1608 * special "resume" signaling. This routine kicks in shortly after 1609 * hardware resume signaling is finished, either because of selective 1610 * resume (by host) or remote wakeup (by device) ... now see what changed 1611 * in the tree that's rooted at this device. 1612 * 1613 * If @udev->reset_resume is set then the device is reset before the 1614 * status check is done. 1615 */ 1616 static int finish_port_resume(struct usb_device *udev) 1617 { 1618 int status = 0; 1619 u16 devstatus; 1620 1621 /* caller owns the udev device lock */ 1622 dev_dbg(&udev->dev, "finish %sresume\n", 1623 udev->reset_resume ? "reset-" : ""); 1624 1625 /* usb ch9 identifies four variants of SUSPENDED, based on what 1626 * state the device resumes to. Linux currently won't see the 1627 * first two on the host side; they'd be inside hub_port_init() 1628 * during many timeouts, but khubd can't suspend until later. 1629 */ 1630 usb_set_device_state(udev, udev->actconfig 1631 ? USB_STATE_CONFIGURED 1632 : USB_STATE_ADDRESS); 1633 1634 /* 10.5.4.5 says not to reset a suspended port if the attached 1635 * device is enabled for remote wakeup. Hence the reset 1636 * operation is carried out here, after the port has been 1637 * resumed. 1638 */ 1639 if (udev->reset_resume) 1640 status = usb_reset_device(udev); 1641 1642 /* 10.5.4.5 says be sure devices in the tree are still there. 1643 * For now let's assume the device didn't go crazy on resume, 1644 * and device drivers will know about any resume quirks. 1645 */ 1646 if (status == 0) { 1647 devstatus = 0; 1648 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 1649 if (status >= 0) 1650 status = (status > 0 ? 0 : -ENODEV); 1651 } 1652 1653 if (status) { 1654 dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 1655 status); 1656 } else if (udev->actconfig) { 1657 le16_to_cpus(&devstatus); 1658 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { 1659 status = usb_control_msg(udev, 1660 usb_sndctrlpipe(udev, 0), 1661 USB_REQ_CLEAR_FEATURE, 1662 USB_RECIP_DEVICE, 1663 USB_DEVICE_REMOTE_WAKEUP, 0, 1664 NULL, 0, 1665 USB_CTRL_SET_TIMEOUT); 1666 if (status) 1667 dev_dbg(&udev->dev, "disable remote " 1668 "wakeup, status %d\n", status); 1669 } 1670 status = 0; 1671 } 1672 return status; 1673 } 1674 1675 /* 1676 * usb_port_resume - re-activate a suspended usb device's upstream port 1677 * @udev: device to re-activate, not a root hub 1678 * Context: must be able to sleep; device not locked; pm locks held 1679 * 1680 * This will re-activate the suspended device, increasing power usage 1681 * while letting drivers communicate again with its endpoints. 1682 * USB resume explicitly guarantees that the power session between 1683 * the host and the device is the same as it was when the device 1684 * suspended. 1685 * 1686 * If CONFIG_USB_PERSIST and @udev->reset_resume are both set then this 1687 * routine won't check that the port is still enabled. Furthermore, 1688 * if @udev->reset_resume is set then finish_port_resume() above will 1689 * reset @udev. The end result is that a broken power session can be 1690 * recovered and @udev will appear to persist across a loss of VBUS power. 1691 * 1692 * For example, if a host controller doesn't maintain VBUS suspend current 1693 * during a system sleep or is reset when the system wakes up, all the USB 1694 * power sessions below it will be broken. This is especially troublesome 1695 * for mass-storage devices containing mounted filesystems, since the 1696 * device will appear to have disconnected and all the memory mappings 1697 * to it will be lost. Using the USB_PERSIST facility, the device can be 1698 * made to appear as if it had not disconnected. 1699 * 1700 * This facility is inherently dangerous. Although usb_reset_device() 1701 * makes every effort to insure that the same device is present after the 1702 * reset as before, it cannot provide a 100% guarantee. Furthermore it's 1703 * quite possible for a device to remain unaltered but its media to be 1704 * changed. If the user replaces a flash memory card while the system is 1705 * asleep, he will have only himself to blame when the filesystem on the 1706 * new card is corrupted and the system crashes. 1707 * 1708 * Returns 0 on success, else negative errno. 1709 */ 1710 int usb_port_resume(struct usb_device *udev) 1711 { 1712 struct usb_hub *hub = hdev_to_hub(udev->parent); 1713 int port1 = udev->portnum; 1714 int status; 1715 u16 portchange, portstatus; 1716 unsigned mask_flags, want_flags; 1717 1718 /* Skip the initial Clear-Suspend step for a remote wakeup */ 1719 status = hub_port_status(hub, port1, &portstatus, &portchange); 1720 if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND)) 1721 goto SuspendCleared; 1722 1723 // dev_dbg(hub->intfdev, "resume port %d\n", port1); 1724 1725 set_bit(port1, hub->busy_bits); 1726 1727 /* see 7.1.7.7; affects power usage, but not budgeting */ 1728 status = clear_port_feature(hub->hdev, 1729 port1, USB_PORT_FEAT_SUSPEND); 1730 if (status) { 1731 dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", 1732 port1, status); 1733 } else { 1734 /* drive resume for at least 20 msec */ 1735 dev_dbg(&udev->dev, "usb %sresume\n", 1736 udev->auto_pm ? "auto-" : ""); 1737 msleep(25); 1738 1739 /* Virtual root hubs can trigger on GET_PORT_STATUS to 1740 * stop resume signaling. Then finish the resume 1741 * sequence. 1742 */ 1743 status = hub_port_status(hub, port1, &portstatus, &portchange); 1744 1745 SuspendCleared: 1746 if (USB_PERSIST && udev->reset_resume) 1747 want_flags = USB_PORT_STAT_POWER 1748 | USB_PORT_STAT_CONNECTION; 1749 else 1750 want_flags = USB_PORT_STAT_POWER 1751 | USB_PORT_STAT_CONNECTION 1752 | USB_PORT_STAT_ENABLE; 1753 mask_flags = want_flags | USB_PORT_STAT_SUSPEND; 1754 1755 if (status < 0 || (portstatus & mask_flags) != want_flags) { 1756 dev_dbg(hub->intfdev, 1757 "port %d status %04x.%04x after resume, %d\n", 1758 port1, portchange, portstatus, status); 1759 if (status >= 0) 1760 status = -ENODEV; 1761 } else { 1762 if (portchange & USB_PORT_STAT_C_SUSPEND) 1763 clear_port_feature(hub->hdev, port1, 1764 USB_PORT_FEAT_C_SUSPEND); 1765 /* TRSMRCY = 10 msec */ 1766 msleep(10); 1767 } 1768 } 1769 1770 clear_bit(port1, hub->busy_bits); 1771 if (!hub->hdev->parent && !hub->busy_bits[0]) 1772 usb_enable_root_hub_irq(hub->hdev->bus); 1773 1774 if (status == 0) 1775 status = finish_port_resume(udev); 1776 if (status < 0) { 1777 dev_dbg(&udev->dev, "can't resume, status %d\n", status); 1778 hub_port_logical_disconnect(hub, port1); 1779 } 1780 return status; 1781 } 1782 1783 static int remote_wakeup(struct usb_device *udev) 1784 { 1785 int status = 0; 1786 1787 usb_lock_device(udev); 1788 if (udev->state == USB_STATE_SUSPENDED) { 1789 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 1790 usb_mark_last_busy(udev); 1791 status = usb_external_resume_device(udev); 1792 } 1793 usb_unlock_device(udev); 1794 return status; 1795 } 1796 1797 #else /* CONFIG_USB_SUSPEND */ 1798 1799 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ 1800 1801 int usb_port_suspend(struct usb_device *udev) 1802 { 1803 return 0; 1804 } 1805 1806 int usb_port_resume(struct usb_device *udev) 1807 { 1808 int status = 0; 1809 1810 /* However we may need to do a reset-resume */ 1811 if (udev->reset_resume) { 1812 dev_dbg(&udev->dev, "reset-resume\n"); 1813 status = usb_reset_device(udev); 1814 } 1815 return status; 1816 } 1817 1818 static inline int remote_wakeup(struct usb_device *udev) 1819 { 1820 return 0; 1821 } 1822 1823 #endif 1824 1825 static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 1826 { 1827 struct usb_hub *hub = usb_get_intfdata (intf); 1828 struct usb_device *hdev = hub->hdev; 1829 unsigned port1; 1830 1831 /* fail if children aren't already suspended */ 1832 for (port1 = 1; port1 <= hdev->maxchild; port1++) { 1833 struct usb_device *udev; 1834 1835 udev = hdev->children [port1-1]; 1836 if (udev && msg.event == PM_EVENT_SUSPEND && 1837 #ifdef CONFIG_USB_SUSPEND 1838 udev->state != USB_STATE_SUSPENDED 1839 #else 1840 udev->dev.power.power_state.event 1841 == PM_EVENT_ON 1842 #endif 1843 ) { 1844 if (!hdev->auto_pm) 1845 dev_dbg(&intf->dev, "port %d nyet suspended\n", 1846 port1); 1847 return -EBUSY; 1848 } 1849 } 1850 1851 dev_dbg(&intf->dev, "%s\n", __FUNCTION__); 1852 1853 /* stop khubd and related activity */ 1854 hub_quiesce(hub); 1855 return 0; 1856 } 1857 1858 static int hub_resume(struct usb_interface *intf) 1859 { 1860 struct usb_hub *hub = usb_get_intfdata (intf); 1861 1862 dev_dbg(&intf->dev, "%s\n", __FUNCTION__); 1863 1864 /* tell khubd to look for changes on this hub */ 1865 hub_activate(hub); 1866 return 0; 1867 } 1868 1869 static int hub_reset_resume(struct usb_interface *intf) 1870 { 1871 struct usb_hub *hub = usb_get_intfdata(intf); 1872 struct usb_device *hdev = hub->hdev; 1873 int port1; 1874 1875 hub_power_on(hub); 1876 1877 for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 1878 struct usb_device *child = hdev->children[port1-1]; 1879 1880 if (child) { 1881 1882 /* For "USB_PERSIST"-enabled children we must 1883 * mark the child device for reset-resume and 1884 * turn off the connect-change status to prevent 1885 * khubd from disconnecting it later. 1886 */ 1887 if (USB_PERSIST && child->persist_enabled) { 1888 child->reset_resume = 1; 1889 clear_port_feature(hdev, port1, 1890 USB_PORT_FEAT_C_CONNECTION); 1891 1892 /* Otherwise we must disconnect the child, 1893 * but as we may not lock the child device here 1894 * we have to do a "logical" disconnect. 1895 */ 1896 } else { 1897 hub_port_logical_disconnect(hub, port1); 1898 } 1899 } 1900 } 1901 1902 hub_activate(hub); 1903 return 0; 1904 } 1905 1906 /** 1907 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 1908 * @rhdev: struct usb_device for the root hub 1909 * 1910 * The USB host controller driver calls this function when its root hub 1911 * is resumed and Vbus power has been interrupted or the controller 1912 * has been reset. The routine marks @rhdev as having lost power. When 1913 * the hub driver is resumed it will take notice; if CONFIG_USB_PERSIST 1914 * is enabled then it will carry out power-session recovery, otherwise 1915 * it will disconnect all the child devices. 1916 */ 1917 void usb_root_hub_lost_power(struct usb_device *rhdev) 1918 { 1919 dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 1920 rhdev->reset_resume = 1; 1921 } 1922 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 1923 1924 #else /* CONFIG_PM */ 1925 1926 static inline int remote_wakeup(struct usb_device *udev) 1927 { 1928 return 0; 1929 } 1930 1931 #define hub_suspend NULL 1932 #define hub_resume NULL 1933 #define hub_reset_resume NULL 1934 #endif 1935 1936 1937 /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 1938 * 1939 * Between connect detection and reset signaling there must be a delay 1940 * of 100ms at least for debounce and power-settling. The corresponding 1941 * timer shall restart whenever the downstream port detects a disconnect. 1942 * 1943 * Apparently there are some bluetooth and irda-dongles and a number of 1944 * low-speed devices for which this debounce period may last over a second. 1945 * Not covered by the spec - but easy to deal with. 1946 * 1947 * This implementation uses a 1500ms total debounce timeout; if the 1948 * connection isn't stable by then it returns -ETIMEDOUT. It checks 1949 * every 25ms for transient disconnects. When the port status has been 1950 * unchanged for 100ms it returns the port status. 1951 */ 1952 1953 #define HUB_DEBOUNCE_TIMEOUT 1500 1954 #define HUB_DEBOUNCE_STEP 25 1955 #define HUB_DEBOUNCE_STABLE 100 1956 1957 static int hub_port_debounce(struct usb_hub *hub, int port1) 1958 { 1959 int ret; 1960 int total_time, stable_time = 0; 1961 u16 portchange, portstatus; 1962 unsigned connection = 0xffff; 1963 1964 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 1965 ret = hub_port_status(hub, port1, &portstatus, &portchange); 1966 if (ret < 0) 1967 return ret; 1968 1969 if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 1970 (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 1971 stable_time += HUB_DEBOUNCE_STEP; 1972 if (stable_time >= HUB_DEBOUNCE_STABLE) 1973 break; 1974 } else { 1975 stable_time = 0; 1976 connection = portstatus & USB_PORT_STAT_CONNECTION; 1977 } 1978 1979 if (portchange & USB_PORT_STAT_C_CONNECTION) { 1980 clear_port_feature(hub->hdev, port1, 1981 USB_PORT_FEAT_C_CONNECTION); 1982 } 1983 1984 if (total_time >= HUB_DEBOUNCE_TIMEOUT) 1985 break; 1986 msleep(HUB_DEBOUNCE_STEP); 1987 } 1988 1989 dev_dbg (hub->intfdev, 1990 "debounce: port %d: total %dms stable %dms status 0x%x\n", 1991 port1, total_time, stable_time, portstatus); 1992 1993 if (stable_time < HUB_DEBOUNCE_STABLE) 1994 return -ETIMEDOUT; 1995 return portstatus; 1996 } 1997 1998 static void ep0_reinit(struct usb_device *udev) 1999 { 2000 usb_disable_endpoint(udev, 0 + USB_DIR_IN); 2001 usb_disable_endpoint(udev, 0 + USB_DIR_OUT); 2002 udev->ep_in[0] = udev->ep_out[0] = &udev->ep0; 2003 } 2004 2005 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 2006 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 2007 2008 static int hub_set_address(struct usb_device *udev) 2009 { 2010 int retval; 2011 2012 if (udev->devnum == 0) 2013 return -EINVAL; 2014 if (udev->state == USB_STATE_ADDRESS) 2015 return 0; 2016 if (udev->state != USB_STATE_DEFAULT) 2017 return -EINVAL; 2018 retval = usb_control_msg(udev, usb_sndaddr0pipe(), 2019 USB_REQ_SET_ADDRESS, 0, udev->devnum, 0, 2020 NULL, 0, USB_CTRL_SET_TIMEOUT); 2021 if (retval == 0) { 2022 usb_set_device_state(udev, USB_STATE_ADDRESS); 2023 ep0_reinit(udev); 2024 } 2025 return retval; 2026 } 2027 2028 /* Reset device, (re)assign address, get device descriptor. 2029 * Device connection must be stable, no more debouncing needed. 2030 * Returns device in USB_STATE_ADDRESS, except on error. 2031 * 2032 * If this is called for an already-existing device (as part of 2033 * usb_reset_device), the caller must own the device lock. For a 2034 * newly detected device that is not accessible through any global 2035 * pointers, it's not necessary to lock the device. 2036 */ 2037 static int 2038 hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 2039 int retry_counter) 2040 { 2041 static DEFINE_MUTEX(usb_address0_mutex); 2042 2043 struct usb_device *hdev = hub->hdev; 2044 int i, j, retval; 2045 unsigned delay = HUB_SHORT_RESET_TIME; 2046 enum usb_device_speed oldspeed = udev->speed; 2047 char *speed, *type; 2048 2049 /* root hub ports have a slightly longer reset period 2050 * (from USB 2.0 spec, section 7.1.7.5) 2051 */ 2052 if (!hdev->parent) { 2053 delay = HUB_ROOT_RESET_TIME; 2054 if (port1 == hdev->bus->otg_port) 2055 hdev->bus->b_hnp_enable = 0; 2056 } 2057 2058 /* Some low speed devices have problems with the quick delay, so */ 2059 /* be a bit pessimistic with those devices. RHbug #23670 */ 2060 if (oldspeed == USB_SPEED_LOW) 2061 delay = HUB_LONG_RESET_TIME; 2062 2063 mutex_lock(&usb_address0_mutex); 2064 2065 /* Reset the device; full speed may morph to high speed */ 2066 retval = hub_port_reset(hub, port1, udev, delay); 2067 if (retval < 0) /* error or disconnect */ 2068 goto fail; 2069 /* success, speed is known */ 2070 retval = -ENODEV; 2071 2072 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 2073 dev_dbg(&udev->dev, "device reset changed speed!\n"); 2074 goto fail; 2075 } 2076 oldspeed = udev->speed; 2077 2078 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 2079 * it's fixed size except for full speed devices. 2080 * For Wireless USB devices, ep0 max packet is always 512 (tho 2081 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 2082 */ 2083 switch (udev->speed) { 2084 case USB_SPEED_VARIABLE: /* fixed at 512 */ 2085 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512); 2086 break; 2087 case USB_SPEED_HIGH: /* fixed at 64 */ 2088 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); 2089 break; 2090 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 2091 /* to determine the ep0 maxpacket size, try to read 2092 * the device descriptor to get bMaxPacketSize0 and 2093 * then correct our initial guess. 2094 */ 2095 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64); 2096 break; 2097 case USB_SPEED_LOW: /* fixed at 8 */ 2098 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8); 2099 break; 2100 default: 2101 goto fail; 2102 } 2103 2104 type = ""; 2105 switch (udev->speed) { 2106 case USB_SPEED_LOW: speed = "low"; break; 2107 case USB_SPEED_FULL: speed = "full"; break; 2108 case USB_SPEED_HIGH: speed = "high"; break; 2109 case USB_SPEED_VARIABLE: 2110 speed = "variable"; 2111 type = "Wireless "; 2112 break; 2113 default: speed = "?"; break; 2114 } 2115 dev_info (&udev->dev, 2116 "%s %s speed %sUSB device using %s and address %d\n", 2117 (udev->config) ? "reset" : "new", speed, type, 2118 udev->bus->controller->driver->name, udev->devnum); 2119 2120 /* Set up TT records, if needed */ 2121 if (hdev->tt) { 2122 udev->tt = hdev->tt; 2123 udev->ttport = hdev->ttport; 2124 } else if (udev->speed != USB_SPEED_HIGH 2125 && hdev->speed == USB_SPEED_HIGH) { 2126 udev->tt = &hub->tt; 2127 udev->ttport = port1; 2128 } 2129 2130 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 2131 * Because device hardware and firmware is sometimes buggy in 2132 * this area, and this is how Linux has done it for ages. 2133 * Change it cautiously. 2134 * 2135 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing 2136 * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 2137 * so it may help with some non-standards-compliant devices. 2138 * Otherwise we start with SET_ADDRESS and then try to read the 2139 * first 8 bytes of the device descriptor to get the ep0 maxpacket 2140 * value. 2141 */ 2142 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 2143 if (USE_NEW_SCHEME(retry_counter)) { 2144 struct usb_device_descriptor *buf; 2145 int r = 0; 2146 2147 #define GET_DESCRIPTOR_BUFSIZE 64 2148 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 2149 if (!buf) { 2150 retval = -ENOMEM; 2151 continue; 2152 } 2153 2154 /* Retry on all errors; some devices are flakey. 2155 * 255 is for WUSB devices, we actually need to use 2156 * 512 (WUSB1.0[4.8.1]). 2157 */ 2158 for (j = 0; j < 3; ++j) { 2159 buf->bMaxPacketSize0 = 0; 2160 r = usb_control_msg(udev, usb_rcvaddr0pipe(), 2161 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 2162 USB_DT_DEVICE << 8, 0, 2163 buf, GET_DESCRIPTOR_BUFSIZE, 2164 USB_CTRL_GET_TIMEOUT); 2165 switch (buf->bMaxPacketSize0) { 2166 case 8: case 16: case 32: case 64: case 255: 2167 if (buf->bDescriptorType == 2168 USB_DT_DEVICE) { 2169 r = 0; 2170 break; 2171 } 2172 /* FALL THROUGH */ 2173 default: 2174 if (r == 0) 2175 r = -EPROTO; 2176 break; 2177 } 2178 if (r == 0) 2179 break; 2180 } 2181 udev->descriptor.bMaxPacketSize0 = 2182 buf->bMaxPacketSize0; 2183 kfree(buf); 2184 2185 retval = hub_port_reset(hub, port1, udev, delay); 2186 if (retval < 0) /* error or disconnect */ 2187 goto fail; 2188 if (oldspeed != udev->speed) { 2189 dev_dbg(&udev->dev, 2190 "device reset changed speed!\n"); 2191 retval = -ENODEV; 2192 goto fail; 2193 } 2194 if (r) { 2195 dev_err(&udev->dev, "device descriptor " 2196 "read/%s, error %d\n", 2197 "64", r); 2198 retval = -EMSGSIZE; 2199 continue; 2200 } 2201 #undef GET_DESCRIPTOR_BUFSIZE 2202 } 2203 2204 for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 2205 retval = hub_set_address(udev); 2206 if (retval >= 0) 2207 break; 2208 msleep(200); 2209 } 2210 if (retval < 0) { 2211 dev_err(&udev->dev, 2212 "device not accepting address %d, error %d\n", 2213 udev->devnum, retval); 2214 goto fail; 2215 } 2216 2217 /* cope with hardware quirkiness: 2218 * - let SET_ADDRESS settle, some device hardware wants it 2219 * - read ep0 maxpacket even for high and low speed, 2220 */ 2221 msleep(10); 2222 if (USE_NEW_SCHEME(retry_counter)) 2223 break; 2224 2225 retval = usb_get_device_descriptor(udev, 8); 2226 if (retval < 8) { 2227 dev_err(&udev->dev, "device descriptor " 2228 "read/%s, error %d\n", 2229 "8", retval); 2230 if (retval >= 0) 2231 retval = -EMSGSIZE; 2232 } else { 2233 retval = 0; 2234 break; 2235 } 2236 } 2237 if (retval) 2238 goto fail; 2239 2240 i = udev->descriptor.bMaxPacketSize0 == 0xff? 2241 512 : udev->descriptor.bMaxPacketSize0; 2242 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { 2243 if (udev->speed != USB_SPEED_FULL || 2244 !(i == 8 || i == 16 || i == 32 || i == 64)) { 2245 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); 2246 retval = -EMSGSIZE; 2247 goto fail; 2248 } 2249 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 2250 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 2251 ep0_reinit(udev); 2252 } 2253 2254 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 2255 if (retval < (signed)sizeof(udev->descriptor)) { 2256 dev_err(&udev->dev, "device descriptor read/%s, error %d\n", 2257 "all", retval); 2258 if (retval >= 0) 2259 retval = -ENOMSG; 2260 goto fail; 2261 } 2262 2263 retval = 0; 2264 2265 fail: 2266 if (retval) 2267 hub_port_disable(hub, port1, 0); 2268 mutex_unlock(&usb_address0_mutex); 2269 return retval; 2270 } 2271 2272 static void 2273 check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 2274 { 2275 struct usb_qualifier_descriptor *qual; 2276 int status; 2277 2278 qual = kmalloc (sizeof *qual, GFP_KERNEL); 2279 if (qual == NULL) 2280 return; 2281 2282 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 2283 qual, sizeof *qual); 2284 if (status == sizeof *qual) { 2285 dev_info(&udev->dev, "not running at top speed; " 2286 "connect to a high speed hub\n"); 2287 /* hub LEDs are probably harder to miss than syslog */ 2288 if (hub->has_indicators) { 2289 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 2290 schedule_delayed_work (&hub->leds, 0); 2291 } 2292 } 2293 kfree(qual); 2294 } 2295 2296 static unsigned 2297 hub_power_remaining (struct usb_hub *hub) 2298 { 2299 struct usb_device *hdev = hub->hdev; 2300 int remaining; 2301 int port1; 2302 2303 if (!hub->limited_power) 2304 return 0; 2305 2306 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 2307 for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 2308 struct usb_device *udev = hdev->children[port1 - 1]; 2309 int delta; 2310 2311 if (!udev) 2312 continue; 2313 2314 /* Unconfigured devices may not use more than 100mA, 2315 * or 8mA for OTG ports */ 2316 if (udev->actconfig) 2317 delta = udev->actconfig->desc.bMaxPower * 2; 2318 else if (port1 != udev->bus->otg_port || hdev->parent) 2319 delta = 100; 2320 else 2321 delta = 8; 2322 if (delta > hub->mA_per_port) 2323 dev_warn(&udev->dev, "%dmA is over %umA budget " 2324 "for port %d!\n", 2325 delta, hub->mA_per_port, port1); 2326 remaining -= delta; 2327 } 2328 if (remaining < 0) { 2329 dev_warn(hub->intfdev, "%dmA over power budget!\n", 2330 - remaining); 2331 remaining = 0; 2332 } 2333 return remaining; 2334 } 2335 2336 /* Handle physical or logical connection change events. 2337 * This routine is called when: 2338 * a port connection-change occurs; 2339 * a port enable-change occurs (often caused by EMI); 2340 * usb_reset_device() encounters changed descriptors (as from 2341 * a firmware download) 2342 * caller already locked the hub 2343 */ 2344 static void hub_port_connect_change(struct usb_hub *hub, int port1, 2345 u16 portstatus, u16 portchange) 2346 { 2347 struct usb_device *hdev = hub->hdev; 2348 struct device *hub_dev = hub->intfdev; 2349 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 2350 int status, i; 2351 2352 dev_dbg (hub_dev, 2353 "port %d, status %04x, change %04x, %s\n", 2354 port1, portstatus, portchange, portspeed (portstatus)); 2355 2356 if (hub->has_indicators) { 2357 set_port_led(hub, port1, HUB_LED_AUTO); 2358 hub->indicator[port1-1] = INDICATOR_AUTO; 2359 } 2360 2361 /* Disconnect any existing devices under this port */ 2362 if (hdev->children[port1-1]) 2363 usb_disconnect(&hdev->children[port1-1]); 2364 clear_bit(port1, hub->change_bits); 2365 2366 #ifdef CONFIG_USB_OTG 2367 /* during HNP, don't repeat the debounce */ 2368 if (hdev->bus->is_b_host) 2369 portchange &= ~USB_PORT_STAT_C_CONNECTION; 2370 #endif 2371 2372 if (portchange & USB_PORT_STAT_C_CONNECTION) { 2373 status = hub_port_debounce(hub, port1); 2374 if (status < 0) { 2375 if (printk_ratelimit()) 2376 dev_err (hub_dev, "connect-debounce failed, " 2377 "port %d disabled\n", port1); 2378 goto done; 2379 } 2380 portstatus = status; 2381 } 2382 2383 /* Return now if nothing is connected */ 2384 if (!(portstatus & USB_PORT_STAT_CONNECTION)) { 2385 2386 /* maybe switch power back on (e.g. root hub was reset) */ 2387 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 2388 && !(portstatus & (1 << USB_PORT_FEAT_POWER))) 2389 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 2390 2391 if (portstatus & USB_PORT_STAT_ENABLE) 2392 goto done; 2393 return; 2394 } 2395 2396 for (i = 0; i < SET_CONFIG_TRIES; i++) { 2397 struct usb_device *udev; 2398 2399 /* reallocate for each attempt, since references 2400 * to the previous one can escape in various ways 2401 */ 2402 udev = usb_alloc_dev(hdev, hdev->bus, port1); 2403 if (!udev) { 2404 dev_err (hub_dev, 2405 "couldn't allocate port %d usb_device\n", 2406 port1); 2407 goto done; 2408 } 2409 2410 usb_set_device_state(udev, USB_STATE_POWERED); 2411 udev->speed = USB_SPEED_UNKNOWN; 2412 udev->bus_mA = hub->mA_per_port; 2413 udev->level = hdev->level + 1; 2414 2415 /* set the address */ 2416 choose_address(udev); 2417 if (udev->devnum <= 0) { 2418 status = -ENOTCONN; /* Don't retry */ 2419 goto loop; 2420 } 2421 2422 /* reset and get descriptor */ 2423 status = hub_port_init(hub, udev, port1, i); 2424 if (status < 0) 2425 goto loop; 2426 2427 /* consecutive bus-powered hubs aren't reliable; they can 2428 * violate the voltage drop budget. if the new child has 2429 * a "powered" LED, users should notice we didn't enable it 2430 * (without reading syslog), even without per-port LEDs 2431 * on the parent. 2432 */ 2433 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 2434 && udev->bus_mA <= 100) { 2435 u16 devstat; 2436 2437 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 2438 &devstat); 2439 if (status < 2) { 2440 dev_dbg(&udev->dev, "get status %d ?\n", status); 2441 goto loop_disable; 2442 } 2443 le16_to_cpus(&devstat); 2444 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 2445 dev_err(&udev->dev, 2446 "can't connect bus-powered hub " 2447 "to this port\n"); 2448 if (hub->has_indicators) { 2449 hub->indicator[port1-1] = 2450 INDICATOR_AMBER_BLINK; 2451 schedule_delayed_work (&hub->leds, 0); 2452 } 2453 status = -ENOTCONN; /* Don't retry */ 2454 goto loop_disable; 2455 } 2456 } 2457 2458 /* check for devices running slower than they could */ 2459 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 2460 && udev->speed == USB_SPEED_FULL 2461 && highspeed_hubs != 0) 2462 check_highspeed (hub, udev, port1); 2463 2464 /* Store the parent's children[] pointer. At this point 2465 * udev becomes globally accessible, although presumably 2466 * no one will look at it until hdev is unlocked. 2467 */ 2468 status = 0; 2469 2470 /* We mustn't add new devices if the parent hub has 2471 * been disconnected; we would race with the 2472 * recursively_mark_NOTATTACHED() routine. 2473 */ 2474 spin_lock_irq(&device_state_lock); 2475 if (hdev->state == USB_STATE_NOTATTACHED) 2476 status = -ENOTCONN; 2477 else 2478 hdev->children[port1-1] = udev; 2479 spin_unlock_irq(&device_state_lock); 2480 2481 /* Run it through the hoops (find a driver, etc) */ 2482 if (!status) { 2483 status = usb_new_device(udev); 2484 if (status) { 2485 spin_lock_irq(&device_state_lock); 2486 hdev->children[port1-1] = NULL; 2487 spin_unlock_irq(&device_state_lock); 2488 } 2489 } 2490 2491 if (status) 2492 goto loop_disable; 2493 2494 status = hub_power_remaining(hub); 2495 if (status) 2496 dev_dbg(hub_dev, "%dmA power budget left\n", status); 2497 2498 return; 2499 2500 loop_disable: 2501 hub_port_disable(hub, port1, 1); 2502 loop: 2503 ep0_reinit(udev); 2504 release_address(udev); 2505 usb_put_dev(udev); 2506 if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 2507 break; 2508 } 2509 2510 done: 2511 hub_port_disable(hub, port1, 1); 2512 } 2513 2514 static void hub_events(void) 2515 { 2516 struct list_head *tmp; 2517 struct usb_device *hdev; 2518 struct usb_interface *intf; 2519 struct usb_hub *hub; 2520 struct device *hub_dev; 2521 u16 hubstatus; 2522 u16 hubchange; 2523 u16 portstatus; 2524 u16 portchange; 2525 int i, ret; 2526 int connect_change; 2527 2528 /* 2529 * We restart the list every time to avoid a deadlock with 2530 * deleting hubs downstream from this one. This should be 2531 * safe since we delete the hub from the event list. 2532 * Not the most efficient, but avoids deadlocks. 2533 */ 2534 while (1) { 2535 2536 /* Grab the first entry at the beginning of the list */ 2537 spin_lock_irq(&hub_event_lock); 2538 if (list_empty(&hub_event_list)) { 2539 spin_unlock_irq(&hub_event_lock); 2540 break; 2541 } 2542 2543 tmp = hub_event_list.next; 2544 list_del_init(tmp); 2545 2546 hub = list_entry(tmp, struct usb_hub, event_list); 2547 kref_get(&hub->kref); 2548 spin_unlock_irq(&hub_event_lock); 2549 2550 hdev = hub->hdev; 2551 hub_dev = hub->intfdev; 2552 intf = to_usb_interface(hub_dev); 2553 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 2554 hdev->state, hub->descriptor 2555 ? hub->descriptor->bNbrPorts 2556 : 0, 2557 /* NOTE: expects max 15 ports... */ 2558 (u16) hub->change_bits[0], 2559 (u16) hub->event_bits[0]); 2560 2561 /* Lock the device, then check to see if we were 2562 * disconnected while waiting for the lock to succeed. */ 2563 usb_lock_device(hdev); 2564 if (unlikely(hub->disconnected)) 2565 goto loop; 2566 2567 /* If the hub has died, clean up after it */ 2568 if (hdev->state == USB_STATE_NOTATTACHED) { 2569 hub->error = -ENODEV; 2570 hub_pre_reset(intf); 2571 goto loop; 2572 } 2573 2574 /* Autoresume */ 2575 ret = usb_autopm_get_interface(intf); 2576 if (ret) { 2577 dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 2578 goto loop; 2579 } 2580 2581 /* If this is an inactive hub, do nothing */ 2582 if (hub->quiescing) 2583 goto loop_autopm; 2584 2585 if (hub->error) { 2586 dev_dbg (hub_dev, "resetting for error %d\n", 2587 hub->error); 2588 2589 ret = usb_reset_composite_device(hdev, intf); 2590 if (ret) { 2591 dev_dbg (hub_dev, 2592 "error resetting hub: %d\n", ret); 2593 goto loop_autopm; 2594 } 2595 2596 hub->nerrors = 0; 2597 hub->error = 0; 2598 } 2599 2600 /* deal with port status changes */ 2601 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { 2602 if (test_bit(i, hub->busy_bits)) 2603 continue; 2604 connect_change = test_bit(i, hub->change_bits); 2605 if (!test_and_clear_bit(i, hub->event_bits) && 2606 !connect_change && !hub->activating) 2607 continue; 2608 2609 ret = hub_port_status(hub, i, 2610 &portstatus, &portchange); 2611 if (ret < 0) 2612 continue; 2613 2614 if (hub->activating && !hdev->children[i-1] && 2615 (portstatus & 2616 USB_PORT_STAT_CONNECTION)) 2617 connect_change = 1; 2618 2619 if (portchange & USB_PORT_STAT_C_CONNECTION) { 2620 clear_port_feature(hdev, i, 2621 USB_PORT_FEAT_C_CONNECTION); 2622 connect_change = 1; 2623 } 2624 2625 if (portchange & USB_PORT_STAT_C_ENABLE) { 2626 if (!connect_change) 2627 dev_dbg (hub_dev, 2628 "port %d enable change, " 2629 "status %08x\n", 2630 i, portstatus); 2631 clear_port_feature(hdev, i, 2632 USB_PORT_FEAT_C_ENABLE); 2633 2634 /* 2635 * EM interference sometimes causes badly 2636 * shielded USB devices to be shutdown by 2637 * the hub, this hack enables them again. 2638 * Works at least with mouse driver. 2639 */ 2640 if (!(portstatus & USB_PORT_STAT_ENABLE) 2641 && !connect_change 2642 && hdev->children[i-1]) { 2643 dev_err (hub_dev, 2644 "port %i " 2645 "disabled by hub (EMI?), " 2646 "re-enabling...\n", 2647 i); 2648 connect_change = 1; 2649 } 2650 } 2651 2652 if (portchange & USB_PORT_STAT_C_SUSPEND) { 2653 clear_port_feature(hdev, i, 2654 USB_PORT_FEAT_C_SUSPEND); 2655 if (hdev->children[i-1]) { 2656 ret = remote_wakeup(hdev-> 2657 children[i-1]); 2658 if (ret < 0) 2659 connect_change = 1; 2660 } else { 2661 ret = -ENODEV; 2662 hub_port_disable(hub, i, 1); 2663 } 2664 dev_dbg (hub_dev, 2665 "resume on port %d, status %d\n", 2666 i, ret); 2667 } 2668 2669 if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 2670 dev_err (hub_dev, 2671 "over-current change on port %d\n", 2672 i); 2673 clear_port_feature(hdev, i, 2674 USB_PORT_FEAT_C_OVER_CURRENT); 2675 hub_power_on(hub); 2676 } 2677 2678 if (portchange & USB_PORT_STAT_C_RESET) { 2679 dev_dbg (hub_dev, 2680 "reset change on port %d\n", 2681 i); 2682 clear_port_feature(hdev, i, 2683 USB_PORT_FEAT_C_RESET); 2684 } 2685 2686 if (connect_change) 2687 hub_port_connect_change(hub, i, 2688 portstatus, portchange); 2689 } /* end for i */ 2690 2691 /* deal with hub status changes */ 2692 if (test_and_clear_bit(0, hub->event_bits) == 0) 2693 ; /* do nothing */ 2694 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 2695 dev_err (hub_dev, "get_hub_status failed\n"); 2696 else { 2697 if (hubchange & HUB_CHANGE_LOCAL_POWER) { 2698 dev_dbg (hub_dev, "power change\n"); 2699 clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 2700 if (hubstatus & HUB_STATUS_LOCAL_POWER) 2701 /* FIXME: Is this always true? */ 2702 hub->limited_power = 0; 2703 else 2704 hub->limited_power = 1; 2705 } 2706 if (hubchange & HUB_CHANGE_OVERCURRENT) { 2707 dev_dbg (hub_dev, "overcurrent change\n"); 2708 msleep(500); /* Cool down */ 2709 clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 2710 hub_power_on(hub); 2711 } 2712 } 2713 2714 hub->activating = 0; 2715 2716 /* If this is a root hub, tell the HCD it's okay to 2717 * re-enable port-change interrupts now. */ 2718 if (!hdev->parent && !hub->busy_bits[0]) 2719 usb_enable_root_hub_irq(hdev->bus); 2720 2721 loop_autopm: 2722 /* Allow autosuspend if we're not going to run again */ 2723 if (list_empty(&hub->event_list)) 2724 usb_autopm_enable(intf); 2725 loop: 2726 usb_unlock_device(hdev); 2727 kref_put(&hub->kref, hub_release); 2728 2729 } /* end while (1) */ 2730 } 2731 2732 static int hub_thread(void *__unused) 2733 { 2734 set_freezable(); 2735 do { 2736 hub_events(); 2737 wait_event_interruptible(khubd_wait, 2738 !list_empty(&hub_event_list) || 2739 kthread_should_stop()); 2740 try_to_freeze(); 2741 } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 2742 2743 pr_debug("%s: khubd exiting\n", usbcore_name); 2744 return 0; 2745 } 2746 2747 static struct usb_device_id hub_id_table [] = { 2748 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 2749 .bDeviceClass = USB_CLASS_HUB}, 2750 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 2751 .bInterfaceClass = USB_CLASS_HUB}, 2752 { } /* Terminating entry */ 2753 }; 2754 2755 MODULE_DEVICE_TABLE (usb, hub_id_table); 2756 2757 static struct usb_driver hub_driver = { 2758 .name = "hub", 2759 .probe = hub_probe, 2760 .disconnect = hub_disconnect, 2761 .suspend = hub_suspend, 2762 .resume = hub_resume, 2763 .reset_resume = hub_reset_resume, 2764 .pre_reset = hub_pre_reset, 2765 .post_reset = hub_post_reset, 2766 .ioctl = hub_ioctl, 2767 .id_table = hub_id_table, 2768 .supports_autosuspend = 1, 2769 }; 2770 2771 int usb_hub_init(void) 2772 { 2773 if (usb_register(&hub_driver) < 0) { 2774 printk(KERN_ERR "%s: can't register hub driver\n", 2775 usbcore_name); 2776 return -1; 2777 } 2778 2779 khubd_task = kthread_run(hub_thread, NULL, "khubd"); 2780 if (!IS_ERR(khubd_task)) 2781 return 0; 2782 2783 /* Fall through if kernel_thread failed */ 2784 usb_deregister(&hub_driver); 2785 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 2786 2787 return -1; 2788 } 2789 2790 void usb_hub_cleanup(void) 2791 { 2792 kthread_stop(khubd_task); 2793 2794 /* 2795 * Hub resources are freed for us by usb_deregister. It calls 2796 * usb_driver_purge on every device which in turn calls that 2797 * devices disconnect function if it is using this driver. 2798 * The hub_disconnect function takes care of releasing the 2799 * individual hub resources. -greg 2800 */ 2801 usb_deregister(&hub_driver); 2802 } /* usb_hub_cleanup() */ 2803 2804 static int config_descriptors_changed(struct usb_device *udev) 2805 { 2806 unsigned index; 2807 unsigned len = 0; 2808 struct usb_config_descriptor *buf; 2809 2810 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 2811 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength)) 2812 len = le16_to_cpu(udev->config[index].desc.wTotalLength); 2813 } 2814 buf = kmalloc (len, GFP_KERNEL); 2815 if (buf == NULL) { 2816 dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 2817 /* assume the worst */ 2818 return 1; 2819 } 2820 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 2821 int length; 2822 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 2823 2824 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 2825 old_length); 2826 if (length < old_length) { 2827 dev_dbg(&udev->dev, "config index %d, error %d\n", 2828 index, length); 2829 break; 2830 } 2831 if (memcmp (buf, udev->rawdescriptors[index], old_length) 2832 != 0) { 2833 dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 2834 index, buf->bConfigurationValue); 2835 break; 2836 } 2837 } 2838 kfree(buf); 2839 return index != udev->descriptor.bNumConfigurations; 2840 } 2841 2842 /** 2843 * usb_reset_device - perform a USB port reset to reinitialize a device 2844 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 2845 * 2846 * WARNING - don't use this routine to reset a composite device 2847 * (one with multiple interfaces owned by separate drivers)! 2848 * Use usb_reset_composite_device() instead. 2849 * 2850 * Do a port reset, reassign the device's address, and establish its 2851 * former operating configuration. If the reset fails, or the device's 2852 * descriptors change from their values before the reset, or the original 2853 * configuration and altsettings cannot be restored, a flag will be set 2854 * telling khubd to pretend the device has been disconnected and then 2855 * re-connected. All drivers will be unbound, and the device will be 2856 * re-enumerated and probed all over again. 2857 * 2858 * Returns 0 if the reset succeeded, -ENODEV if the device has been 2859 * flagged for logical disconnection, or some other negative error code 2860 * if the reset wasn't even attempted. 2861 * 2862 * The caller must own the device lock. For example, it's safe to use 2863 * this from a driver probe() routine after downloading new firmware. 2864 * For calls that might not occur during probe(), drivers should lock 2865 * the device using usb_lock_device_for_reset(). 2866 * 2867 * Locking exception: This routine may also be called from within an 2868 * autoresume handler. Such usage won't conflict with other tasks 2869 * holding the device lock because these tasks should always call 2870 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. 2871 */ 2872 int usb_reset_device(struct usb_device *udev) 2873 { 2874 struct usb_device *parent_hdev = udev->parent; 2875 struct usb_hub *parent_hub; 2876 struct usb_device_descriptor descriptor = udev->descriptor; 2877 int i, ret = 0; 2878 int port1 = udev->portnum; 2879 2880 if (udev->state == USB_STATE_NOTATTACHED || 2881 udev->state == USB_STATE_SUSPENDED) { 2882 dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 2883 udev->state); 2884 return -EINVAL; 2885 } 2886 2887 if (!parent_hdev) { 2888 /* this requires hcd-specific logic; see OHCI hc_restart() */ 2889 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__); 2890 return -EISDIR; 2891 } 2892 parent_hub = hdev_to_hub(parent_hdev); 2893 2894 set_bit(port1, parent_hub->busy_bits); 2895 for (i = 0; i < SET_CONFIG_TRIES; ++i) { 2896 2897 /* ep0 maxpacket size may change; let the HCD know about it. 2898 * Other endpoints will be handled by re-enumeration. */ 2899 ep0_reinit(udev); 2900 ret = hub_port_init(parent_hub, udev, port1, i); 2901 if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 2902 break; 2903 } 2904 clear_bit(port1, parent_hub->busy_bits); 2905 if (!parent_hdev->parent && !parent_hub->busy_bits[0]) 2906 usb_enable_root_hub_irq(parent_hdev->bus); 2907 2908 if (ret < 0) 2909 goto re_enumerate; 2910 2911 /* Device might have changed firmware (DFU or similar) */ 2912 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor) 2913 || config_descriptors_changed (udev)) { 2914 dev_info(&udev->dev, "device firmware changed\n"); 2915 udev->descriptor = descriptor; /* for disconnect() calls */ 2916 goto re_enumerate; 2917 } 2918 2919 if (!udev->actconfig) 2920 goto done; 2921 2922 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2923 USB_REQ_SET_CONFIGURATION, 0, 2924 udev->actconfig->desc.bConfigurationValue, 0, 2925 NULL, 0, USB_CTRL_SET_TIMEOUT); 2926 if (ret < 0) { 2927 dev_err(&udev->dev, 2928 "can't restore configuration #%d (error=%d)\n", 2929 udev->actconfig->desc.bConfigurationValue, ret); 2930 goto re_enumerate; 2931 } 2932 usb_set_device_state(udev, USB_STATE_CONFIGURED); 2933 2934 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 2935 struct usb_interface *intf = udev->actconfig->interface[i]; 2936 struct usb_interface_descriptor *desc; 2937 2938 /* set_interface resets host side toggle even 2939 * for altsetting zero. the interface may have no driver. 2940 */ 2941 desc = &intf->cur_altsetting->desc; 2942 ret = usb_set_interface(udev, desc->bInterfaceNumber, 2943 desc->bAlternateSetting); 2944 if (ret < 0) { 2945 dev_err(&udev->dev, "failed to restore interface %d " 2946 "altsetting %d (error=%d)\n", 2947 desc->bInterfaceNumber, 2948 desc->bAlternateSetting, 2949 ret); 2950 goto re_enumerate; 2951 } 2952 } 2953 2954 done: 2955 return 0; 2956 2957 re_enumerate: 2958 hub_port_logical_disconnect(parent_hub, port1); 2959 return -ENODEV; 2960 } 2961 EXPORT_SYMBOL(usb_reset_device); 2962 2963 /** 2964 * usb_reset_composite_device - warn interface drivers and perform a USB port reset 2965 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 2966 * @iface: interface bound to the driver making the request (optional) 2967 * 2968 * Warns all drivers bound to registered interfaces (using their pre_reset 2969 * method), performs the port reset, and then lets the drivers know that 2970 * the reset is over (using their post_reset method). 2971 * 2972 * Return value is the same as for usb_reset_device(). 2973 * 2974 * The caller must own the device lock. For example, it's safe to use 2975 * this from a driver probe() routine after downloading new firmware. 2976 * For calls that might not occur during probe(), drivers should lock 2977 * the device using usb_lock_device_for_reset(). 2978 * 2979 * The interface locks are acquired during the pre_reset stage and released 2980 * during the post_reset stage. However if iface is not NULL and is 2981 * currently being probed, we assume that the caller already owns its 2982 * lock. 2983 */ 2984 int usb_reset_composite_device(struct usb_device *udev, 2985 struct usb_interface *iface) 2986 { 2987 int ret; 2988 struct usb_host_config *config = udev->actconfig; 2989 2990 if (udev->state == USB_STATE_NOTATTACHED || 2991 udev->state == USB_STATE_SUSPENDED) { 2992 dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 2993 udev->state); 2994 return -EINVAL; 2995 } 2996 2997 /* Prevent autosuspend during the reset */ 2998 usb_autoresume_device(udev); 2999 3000 if (iface && iface->condition != USB_INTERFACE_BINDING) 3001 iface = NULL; 3002 3003 if (config) { 3004 int i; 3005 struct usb_interface *cintf; 3006 struct usb_driver *drv; 3007 3008 for (i = 0; i < config->desc.bNumInterfaces; ++i) { 3009 cintf = config->interface[i]; 3010 if (cintf != iface) 3011 down(&cintf->dev.sem); 3012 if (device_is_registered(&cintf->dev) && 3013 cintf->dev.driver) { 3014 drv = to_usb_driver(cintf->dev.driver); 3015 if (drv->pre_reset) 3016 (drv->pre_reset)(cintf); 3017 /* FIXME: Unbind if pre_reset returns an error or isn't defined */ 3018 } 3019 } 3020 } 3021 3022 ret = usb_reset_device(udev); 3023 3024 if (config) { 3025 int i; 3026 struct usb_interface *cintf; 3027 struct usb_driver *drv; 3028 3029 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 3030 cintf = config->interface[i]; 3031 if (device_is_registered(&cintf->dev) && 3032 cintf->dev.driver) { 3033 drv = to_usb_driver(cintf->dev.driver); 3034 if (drv->post_reset) 3035 (drv->post_reset)(cintf); 3036 /* FIXME: Unbind if post_reset returns an error or isn't defined */ 3037 } 3038 if (cintf != iface) 3039 up(&cintf->dev.sem); 3040 } 3041 } 3042 3043 usb_autosuspend_device(udev); 3044 return ret; 3045 } 3046 EXPORT_SYMBOL(usb_reset_composite_device); 3047