drivers/usb/host/usb-uclass.c

   1 /*
   2  * (C) Copyright 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * usb_match_device() modified from Linux kernel v4.0.
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <dm.h>
  12 #include <errno.h>
  13 #include <memalign.h>
  14 #include <usb.h>
  15 #include <dm/device-internal.h>
  16 #include <dm/lists.h>
  17 #include <dm/uclass-internal.h>
  18
  19 extern bool usb_started; /* flag for the started/stopped USB status */
  20 static bool asynch_allowed;
  21
  22 struct usb_uclass_priv {
  23         int companion_device_count;
  24 };
  25
  26 int usb_disable_asynch(int disable)
  27 {
  28         int old_value = asynch_allowed;
  29
  30         asynch_allowed = !disable;
  31         return old_value;
  32 }
  33
  34 int submit_int_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
  35                    int length, int interval)
  36 {
  37         struct udevice *bus = udev->controller_dev;
  38         struct dm_usb_ops *ops = usb_get_ops(bus);
  39
  40         if (!ops->interrupt)
  41                 return -ENOSYS;
  42
  43         return ops->interrupt(bus, udev, pipe, buffer, length, interval);
  44 }
  45
  46 int submit_control_msg(struct usb_device *udev, unsigned long pipe,
  47                        void *buffer, int length, struct devrequest *setup)
  48 {
  49         struct udevice *bus = udev->controller_dev;
  50         struct dm_usb_ops *ops = usb_get_ops(bus);
  51         struct usb_uclass_priv *uc_priv = bus->uclass->priv;
  52         int err;
  53
  54         if (!ops->control)
  55                 return -ENOSYS;
  56
  57         err = ops->control(bus, udev, pipe, buffer, length, setup);
  58         if (setup->request == USB_REQ_SET_FEATURE &&
  59             setup->requesttype == USB_RT_PORT &&
  60             setup->value == cpu_to_le16(USB_PORT_FEAT_RESET) &&
  61             err == -ENXIO) {
  62                 /* Device handed over to companion after port reset */
  63                 uc_priv->companion_device_count++;
  64         }
  65
  66         return err;
  67 }
  68
  69 int submit_bulk_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
  70                     int length)
  71 {
  72         struct udevice *bus = udev->controller_dev;
  73         struct dm_usb_ops *ops = usb_get_ops(bus);
  74
  75         if (!ops->bulk)
  76                 return -ENOSYS;
  77
  78         return ops->bulk(bus, udev, pipe, buffer, length);
  79 }
  80
  81 struct int_queue *create_int_queue(struct usb_device *udev,
  82                 unsigned long pipe, int queuesize, int elementsize,
  83                 void *buffer, int interval)
  84 {
  85         struct udevice *bus = udev->controller_dev;
  86         struct dm_usb_ops *ops = usb_get_ops(bus);
  87
  88         if (!ops->create_int_queue)
  89                 return NULL;
  90
  91         return ops->create_int_queue(bus, udev, pipe, queuesize, elementsize,
  92                                      buffer, interval);
  93 }
  94
  95 void *poll_int_queue(struct usb_device *udev, struct int_queue *queue)
  96 {
  97         struct udevice *bus = udev->controller_dev;
  98         struct dm_usb_ops *ops = usb_get_ops(bus);
  99
 100         if (!ops->poll_int_queue)
 101                 return NULL;
 102
 103         return ops->poll_int_queue(bus, udev, queue);
 104 }
 105
 106 int destroy_int_queue(struct usb_device *udev, struct int_queue *queue)
 107 {
 108         struct udevice *bus = udev->controller_dev;
 109         struct dm_usb_ops *ops = usb_get_ops(bus);
 110
 111         if (!ops->destroy_int_queue)
 112                 return -ENOSYS;
 113
 114         return ops->destroy_int_queue(bus, udev, queue);
 115 }
 116
 117 int usb_alloc_device(struct usb_device *udev)
 118 {
 119         struct udevice *bus = udev->controller_dev;
 120         struct dm_usb_ops *ops = usb_get_ops(bus);
 121
 122         /* This is only requird by some controllers - current XHCI */
 123         if (!ops->alloc_device)
 124                 return 0;
 125
 126         return ops->alloc_device(bus, udev);
 127 }
 128
 129 int usb_reset_root_port(struct usb_device *udev)
 130 {
 131         struct udevice *bus = udev->controller_dev;
 132         struct dm_usb_ops *ops = usb_get_ops(bus);
 133
 134         if (!ops->reset_root_port)
 135                 return -ENOSYS;
 136
 137         return ops->reset_root_port(bus, udev);
 138 }
 139
 140 int usb_update_hub_device(struct usb_device *udev)
 141 {
 142         struct udevice *bus = udev->controller_dev;
 143         struct dm_usb_ops *ops = usb_get_ops(bus);
 144
 145         if (!ops->update_hub_device)
 146                 return -ENOSYS;
 147
 148         return ops->update_hub_device(bus, udev);
 149 }
 150
 151 int usb_get_max_xfer_size(struct usb_device *udev, size_t *size)
 152 {
 153         struct udevice *bus = udev->controller_dev;
 154         struct dm_usb_ops *ops = usb_get_ops(bus);
 155
 156         if (!ops->get_max_xfer_size)
 157                 return -ENOSYS;
 158
 159         return ops->get_max_xfer_size(bus, size);
 160 }
 161
 162 int usb_stop(void)
 163 {
 164         struct udevice *bus;
 165         struct udevice *rh;
 166         struct uclass *uc;
 167         struct usb_uclass_priv *uc_priv;
 168         int err = 0, ret;
 169
 170         /* De-activate any devices that have been activated */
 171         ret = uclass_get(UCLASS_USB, &uc);
 172         if (ret)
 173                 return ret;
 174
 175         uc_priv = uc->priv;
 176
 177         uclass_foreach_dev(bus, uc) {
 178                 ret = device_remove(bus, DM_REMOVE_NORMAL);
 179                 if (ret && !err)
 180                         err = ret;
 181
 182                 /* Locate root hub device */
 183                 device_find_first_child(bus, &rh);
 184                 if (rh) {
 185                         /*
 186                          * All USB devices are children of root hub.
 187                          * Unbinding root hub will unbind all of its children.
 188                          */
 189                         ret = device_unbind(rh);
 190                         if (ret && !err)
 191                                 err = ret;
 192                 }
 193         }
 194
 195 #ifdef CONFIG_USB_STORAGE
 196         usb_stor_reset();
 197 #endif
 198         uc_priv->companion_device_count = 0;
 199         usb_started = 0;
 200
 201         return err;
 202 }
 203
 204 static void usb_scan_bus(struct udevice *bus, bool recurse)
 205 {
 206         struct usb_bus_priv *priv;
 207         struct udevice *dev;
 208         int ret;
 209
 210         priv = dev_get_uclass_priv(bus);
 211
 212         assert(recurse);        /* TODO: Support non-recusive */
 213
 214         printf("scanning bus %d for devices... ", bus->seq);
 215         debug("\n");
 216         ret = usb_scan_device(bus, 0, USB_SPEED_FULL, &dev);
 217         if (ret)
 218                 printf("failed, error %d\n", ret);
 219         else if (priv->next_addr == 0)
 220                 printf("No USB Device found\n");
 221         else
 222                 printf("%d USB Device(s) found\n", priv->next_addr);
 223 }
 224
 225 static void remove_inactive_children(struct uclass *uc, struct udevice *bus)
 226 {
 227         uclass_foreach_dev(bus, uc) {
 228                 struct udevice *dev, *next;
 229
 230                 if (!device_active(bus))
 231                         continue;
 232                 device_foreach_child_safe(dev, next, bus) {
 233                         if (!device_active(dev))
 234                                 device_unbind(dev);
 235                 }
 236         }
 237 }
 238
 239 int usb_init(void)
 240 {
 241         int controllers_initialized = 0;
 242         struct usb_uclass_priv *uc_priv;
 243         struct usb_bus_priv *priv;
 244         struct udevice *bus;
 245         struct uclass *uc;
 246         int count = 0;
 247         int ret;
 248
 249         asynch_allowed = 1;
 250
 251         ret = uclass_get(UCLASS_USB, &uc);
 252         if (ret)
 253                 return ret;
 254
 255         uc_priv = uc->priv;
 256
 257         uclass_foreach_dev(bus, uc) {
 258                 /* init low_level USB */
 259                 printf("USB%d:   ", count);
 260                 count++;
 261
 262 #ifdef CONFIG_SANDBOX
 263                 /*
 264                  * For Sandbox, we need scan the device tree each time when we
 265                  * start the USB stack, in order to re-create the emulated USB
 266                  * devices and bind drivers for them before we actually do the
 267                  * driver probe.
 268                  */
 269                 ret = dm_scan_fdt_dev(bus);
 270                 if (ret) {
 271                         printf("Sandbox USB device scan failed (%d)\n", ret);
 272                         continue;
 273                 }
 274 #endif
 275
 276                 ret = device_probe(bus);
 277                 if (ret == -ENODEV) {   /* No such device. */
 278                         puts("Port not available.\n");
 279                         controllers_initialized++;
 280                         continue;
 281                 }
 282
 283                 if (ret) {              /* Other error. */
 284                         printf("probe failed, error %d\n", ret);
 285                         continue;
 286                 }
 287                 controllers_initialized++;
 288                 usb_started = true;
 289         }
 290
 291         /*
 292          * lowlevel init done, now scan the bus for devices i.e. search HUBs
 293          * and configure them, first scan primary controllers.
 294          */
 295         uclass_foreach_dev(bus, uc) {
 296                 if (!device_active(bus))
 297                         continue;
 298
 299                 priv = dev_get_uclass_priv(bus);
 300                 if (!priv->companion)
 301                         usb_scan_bus(bus, true);
 302         }
 303
 304         /*
 305          * Now that the primary controllers have been scanned and have handed
 306          * over any devices they do not understand to their companions, scan
 307          * the companions if necessary.
 308          */
 309         if (uc_priv->companion_device_count) {
 310                 uclass_foreach_dev(bus, uc) {
 311                         if (!device_active(bus))
 312                                 continue;
 313
 314                         priv = dev_get_uclass_priv(bus);
 315                         if (priv->companion)
 316                                 usb_scan_bus(bus, true);
 317                 }
 318         }
 319
 320         debug("scan end\n");
 321
 322         /* Remove any devices that were not found on this scan */
 323         remove_inactive_children(uc, bus);
 324
 325         ret = uclass_get(UCLASS_USB_HUB, &uc);
 326         if (ret)
 327                 return ret;
 328         remove_inactive_children(uc, bus);
 329
 330         /* if we were not able to find at least one working bus, bail out */
 331         if (!count)
 332                 printf("No controllers found\n");
 333         else if (controllers_initialized == 0)
 334                 printf("USB error: all controllers failed lowlevel init\n");
 335
 336         return usb_started ? 0 : -1;
 337 }
 338
 339 /*
 340  * TODO(sjg@chromium.org): Remove this legacy function. At present it is needed
 341  * to support boards which use driver model for USB but not Ethernet, and want
 342  * to use USB Ethernet.
 343  *
 344  * The #if clause is here to ensure that remains the only case.
 345  */
 346 #if !defined(CONFIG_DM_ETH) && defined(CONFIG_USB_HOST_ETHER)
 347 static struct usb_device *find_child_devnum(struct udevice *parent, int devnum)
 348 {
 349         struct usb_device *udev;
 350         struct udevice *dev;
 351
 352         if (!device_active(parent))
 353                 return NULL;
 354         udev = dev_get_parent_priv(parent);
 355         if (udev->devnum == devnum)
 356                 return udev;
 357
 358         for (device_find_first_child(parent, &dev);
 359              dev;
 360              device_find_next_child(&dev)) {
 361                 udev = find_child_devnum(dev, devnum);
 362                 if (udev)
 363                         return udev;
 364         }
 365
 366         return NULL;
 367 }
 368
 369 struct usb_device *usb_get_dev_index(struct udevice *bus, int index)
 370 {
 371         struct udevice *dev;
 372         int devnum = index + 1; /* Addresses are allocated from 1 on USB */
 373
 374         device_find_first_child(bus, &dev);
 375         if (!dev)
 376                 return NULL;
 377
 378         return find_child_devnum(dev, devnum);
 379 }
 380 #endif
 381
 382 int usb_setup_ehci_gadget(struct ehci_ctrl **ctlrp)
 383 {
 384         struct usb_platdata *plat;
 385         struct udevice *dev;
 386         int ret;
 387
 388         /* Find the old device and remove it */
 389         ret = uclass_find_device_by_seq(UCLASS_USB, 0, true, &dev);
 390         if (ret)
 391                 return ret;
 392         ret = device_remove(dev, DM_REMOVE_NORMAL);
 393         if (ret)
 394                 return ret;
 395
 396         plat = dev_get_platdata(dev);
 397         plat->init_type = USB_INIT_DEVICE;
 398         ret = device_probe(dev);
 399         if (ret)
 400                 return ret;
 401         *ctlrp = dev_get_priv(dev);
 402
 403         return 0;
 404 }
 405
 406 /* returns 0 if no match, 1 if match */
 407 static int usb_match_device(const struct usb_device_descriptor *desc,
 408                             const struct usb_device_id *id)
 409 {
 410         if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
 411             id->idVendor != le16_to_cpu(desc->idVendor))
 412                 return 0;
 413
 414         if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
 415             id->idProduct != le16_to_cpu(desc->idProduct))
 416                 return 0;
 417
 418         /* No need to test id->bcdDevice_lo != 0, since 0 is never
 419            greater than any unsigned number. */
 420         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
 421             (id->bcdDevice_lo > le16_to_cpu(desc->bcdDevice)))
 422                 return 0;
 423
 424         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
 425             (id->bcdDevice_hi < le16_to_cpu(desc->bcdDevice)))
 426                 return 0;
 427
 428         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
 429             (id->bDeviceClass != desc->bDeviceClass))
 430                 return 0;
 431
 432         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
 433             (id->bDeviceSubClass != desc->bDeviceSubClass))
 434                 return 0;
 435
 436         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
 437             (id->bDeviceProtocol != desc->bDeviceProtocol))
 438                 return 0;
 439
 440         return 1;
 441 }
 442
 443 /* returns 0 if no match, 1 if match */
 444 static int usb_match_one_id_intf(const struct usb_device_descriptor *desc,
 445                         const struct usb_interface_descriptor *int_desc,
 446                         const struct usb_device_id *id)
 447 {
 448         /* The interface class, subclass, protocol and number should never be
 449          * checked for a match if the device class is Vendor Specific,
 450          * unless the match record specifies the Vendor ID. */
 451         if (desc->bDeviceClass == USB_CLASS_VENDOR_SPEC &&
 452             !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
 453             (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS |
 454                                 USB_DEVICE_ID_MATCH_INT_SUBCLASS |
 455                                 USB_DEVICE_ID_MATCH_INT_PROTOCOL |
 456                                 USB_DEVICE_ID_MATCH_INT_NUMBER)))
 457                 return 0;
 458
 459         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
 460             (id->bInterfaceClass != int_desc->bInterfaceClass))
 461                 return 0;
 462
 463         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) &&
 464             (id->bInterfaceSubClass != int_desc->bInterfaceSubClass))
 465                 return 0;
 466
 467         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) &&
 468             (id->bInterfaceProtocol != int_desc->bInterfaceProtocol))
 469                 return 0;
 470
 471         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_NUMBER) &&
 472             (id->bInterfaceNumber != int_desc->bInterfaceNumber))
 473                 return 0;
 474
 475         return 1;
 476 }
 477
 478 /* returns 0 if no match, 1 if match */
 479 static int usb_match_one_id(struct usb_device_descriptor *desc,
 480                             struct usb_interface_descriptor *int_desc,
 481                             const struct usb_device_id *id)
 482 {
 483         if (!usb_match_device(desc, id))
 484                 return 0;
 485
 486         return usb_match_one_id_intf(desc, int_desc, id);
 487 }
 488
 489 /**
 490  * usb_find_and_bind_driver() - Find and bind the right USB driver
 491  *
 492  * This only looks at certain fields in the descriptor.
 493  */
 494 static int usb_find_and_bind_driver(struct udevice *parent,
 495                                     struct usb_device_descriptor *desc,
 496                                     struct usb_interface_descriptor *iface,
 497                                     int bus_seq, int devnum,
 498                                     struct udevice **devp)
 499 {
 500         struct usb_driver_entry *start, *entry;
 501         int n_ents;
 502         int ret;
 503         char name[30], *str;
 504
 505         *devp = NULL;
 506         debug("%s: Searching for driver\n", __func__);
 507         start = ll_entry_start(struct usb_driver_entry, usb_driver_entry);
 508         n_ents = ll_entry_count(struct usb_driver_entry, usb_driver_entry);
 509         for (entry = start; entry != start + n_ents; entry++) {
 510                 const struct usb_device_id *id;
 511                 struct udevice *dev;
 512                 const struct driver *drv;
 513                 struct usb_dev_platdata *plat;
 514
 515                 for (id = entry->match; id->match_flags; id++) {
 516                         if (!usb_match_one_id(desc, iface, id))
 517                                 continue;
 518
 519                         drv = entry->driver;
 520                         /*
 521                          * We could pass the descriptor to the driver as
 522                          * platdata (instead of NULL) and allow its bind()
 523                          * method to return -ENOENT if it doesn't support this
 524                          * device. That way we could continue the search to
 525                          * find another driver. For now this doesn't seem
 526                          * necesssary, so just bind the first match.
 527                          */
 528                         ret = device_bind(parent, drv, drv->name, NULL, -1,
 529                                           &dev);
 530                         if (ret)
 531                                 goto error;
 532                         debug("%s: Match found: %s\n", __func__, drv->name);
 533                         dev->driver_data = id->driver_info;
 534                         plat = dev_get_parent_platdata(dev);
 535                         plat->id = *id;
 536                         *devp = dev;
 537                         return 0;
 538                 }
 539         }
 540
 541         /* Bind a generic driver so that the device can be used */
 542         snprintf(name, sizeof(name), "generic_bus_%x_dev_%x", bus_seq, devnum);
 543         str = strdup(name);
 544         if (!str)
 545                 return -ENOMEM;
 546         ret = device_bind_driver(parent, "usb_dev_generic_drv", str, devp);
 547
 548 error:
 549         debug("%s: No match found: %d\n", __func__, ret);
 550         return ret;
 551 }
 552
 553 /**
 554  * usb_find_child() - Find an existing device which matches our needs
 555  *
 556  *
 557  */
 558 static int usb_find_child(struct udevice *parent,
 559                           struct usb_device_descriptor *desc,
 560                           struct usb_interface_descriptor *iface,
 561                           struct udevice **devp)
 562 {
 563         struct udevice *dev;
 564
 565         *devp = NULL;
 566         for (device_find_first_child(parent, &dev);
 567              dev;
 568              device_find_next_child(&dev)) {
 569                 struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 570
 571                 /* If this device is already in use, skip it */
 572                 if (device_active(dev))
 573                         continue;
 574                 debug("   %s: name='%s', plat=%d, desc=%d\n", __func__,
 575                       dev->name, plat->id.bDeviceClass, desc->bDeviceClass);
 576                 if (usb_match_one_id(desc, iface, &plat->id)) {
 577                         *devp = dev;
 578                         return 0;
 579                 }
 580         }
 581
 582         return -ENOENT;
 583 }
 584
 585 int usb_scan_device(struct udevice *parent, int port,
 586                     enum usb_device_speed speed, struct udevice **devp)
 587 {
 588         struct udevice *dev;
 589         bool created = false;
 590         struct usb_dev_platdata *plat;
 591         struct usb_bus_priv *priv;
 592         struct usb_device *parent_udev;
 593         int ret;
 594         ALLOC_CACHE_ALIGN_BUFFER(struct usb_device, udev, 1);
 595         struct usb_interface_descriptor *iface = &udev->config.if_desc[0].desc;
 596
 597         *devp = NULL;
 598         memset(udev, '\0', sizeof(*udev));
 599         udev->controller_dev = usb_get_bus(parent);
 600         priv = dev_get_uclass_priv(udev->controller_dev);
 601
 602         /*
 603          * Somewhat nasty, this. We create a local device and use the normal
 604          * USB stack to read its descriptor. Then we know what type of device
 605          * to create for real.
 606          *
 607          * udev->dev is set to the parent, since we don't have a real device
 608          * yet. The USB stack should not access udev.dev anyway, except perhaps
 609          * to find the controller, and the controller will either be @parent,
 610          * or some parent of @parent.
 611          *
 612          * Another option might be to create the device as a generic USB
 613          * device, then morph it into the correct one when we know what it
 614          * should be. This means that a generic USB device would morph into
 615          * a network controller, or a USB flash stick, for example. However,
 616          * we don't support such morphing and it isn't clear that it would
 617          * be easy to do.
 618          *
 619          * Yet another option is to split out the USB stack parts of udev
 620          * into something like a 'struct urb' (as Linux does) which can exist
 621          * independently of any device. This feels cleaner, but calls for quite
 622          * a big change to the USB stack.
 623          *
 624          * For now, the approach is to set up an empty udev, read its
 625          * descriptor and assign it an address, then bind a real device and
 626          * stash the resulting information into the device's parent
 627          * platform data. Then when we probe it, usb_child_pre_probe() is called
 628          * and it will pull the information out of the stash.
 629          */
 630         udev->dev = parent;
 631         udev->speed = speed;
 632         udev->devnum = priv->next_addr + 1;
 633         udev->portnr = port;
 634         debug("Calling usb_setup_device(), portnr=%d\n", udev->portnr);
 635         parent_udev = device_get_uclass_id(parent) == UCLASS_USB_HUB ?
 636                 dev_get_parent_priv(parent) : NULL;
 637         ret = usb_setup_device(udev, priv->desc_before_addr, parent_udev);
 638         debug("read_descriptor for '%s': ret=%d\n", parent->name, ret);
 639         if (ret)
 640                 return ret;
 641         ret = usb_find_child(parent, &udev->descriptor, iface, &dev);
 642         debug("** usb_find_child returns %d\n", ret);
 643         if (ret) {
 644                 if (ret != -ENOENT)
 645                         return ret;
 646                 ret = usb_find_and_bind_driver(parent, &udev->descriptor, iface,
 647                                                udev->controller_dev->seq,
 648                                                udev->devnum, &dev);
 649                 if (ret)
 650                         return ret;
 651                 created = true;
 652         }
 653         plat = dev_get_parent_platdata(dev);
 654         debug("%s: Probing '%s', plat=%p\n", __func__, dev->name, plat);
 655         plat->devnum = udev->devnum;
 656         plat->udev = udev;
 657         priv->next_addr++;
 658         ret = device_probe(dev);
 659         if (ret) {
 660                 debug("%s: Device '%s' probe failed\n", __func__, dev->name);
 661                 priv->next_addr--;
 662                 if (created)
 663                         device_unbind(dev);
 664                 return ret;
 665         }
 666         *devp = dev;
 667
 668         return 0;
 669 }
 670
 671 /*
 672  * Detect if a USB device has been plugged or unplugged.
 673  */
 674 int usb_detect_change(void)
 675 {
 676         struct udevice *hub;
 677         struct uclass *uc;
 678         int change = 0;
 679         int ret;
 680
 681         ret = uclass_get(UCLASS_USB_HUB, &uc);
 682         if (ret)
 683                 return ret;
 684
 685         uclass_foreach_dev(hub, uc) {
 686                 struct usb_device *udev;
 687                 struct udevice *dev;
 688
 689                 if (!device_active(hub))
 690                         continue;
 691                 for (device_find_first_child(hub, &dev);
 692                      dev;
 693                      device_find_next_child(&dev)) {
 694                         struct usb_port_status status;
 695
 696                         if (!device_active(dev))
 697                                 continue;
 698
 699                         udev = dev_get_parent_priv(dev);
 700                         if (usb_get_port_status(udev, udev->portnr, &status)
 701                                         < 0)
 702                                 /* USB request failed */
 703                                 continue;
 704
 705                         if (le16_to_cpu(status.wPortChange) &
 706                             USB_PORT_STAT_C_CONNECTION)
 707                                 change++;
 708                 }
 709         }
 710
 711         return change;
 712 }
 713
 714 static int usb_child_post_bind(struct udevice *dev)
 715 {
 716         struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 717         int val;
 718
 719         if (!dev_of_valid(dev))
 720                 return 0;
 721
 722         /* We only support matching a few things */
 723         val = dev_read_u32_default(dev, "usb,device-class", -1);
 724         if (val != -1) {
 725                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_DEV_CLASS;
 726                 plat->id.bDeviceClass = val;
 727         }
 728         val = dev_read_u32_default(dev, "usb,interface-class", -1);
 729         if (val != -1) {
 730                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_INT_CLASS;
 731                 plat->id.bInterfaceClass = val;
 732         }
 733
 734         return 0;
 735 }
 736
 737 struct udevice *usb_get_bus(struct udevice *dev)
 738 {
 739         struct udevice *bus;
 740
 741         for (bus = dev; bus && device_get_uclass_id(bus) != UCLASS_USB; )
 742                 bus = bus->parent;
 743         if (!bus) {
 744                 /* By design this cannot happen */
 745                 assert(bus);
 746                 debug("USB HUB '%s' does not have a controller\n", dev->name);
 747         }
 748
 749         return bus;
 750 }
 751
 752 int usb_child_pre_probe(struct udevice *dev)
 753 {
 754         struct usb_device *udev = dev_get_parent_priv(dev);
 755         struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 756         int ret;
 757
 758         if (plat->udev) {
 759                 /*
 760                  * Copy over all the values set in the on stack struct
 761                  * usb_device in usb_scan_device() to our final struct
 762                  * usb_device for this dev.
 763                  */
 764                 *udev = *(plat->udev);
 765                 /* And clear plat->udev as it will not be valid for long */
 766                 plat->udev = NULL;
 767                 udev->dev = dev;
 768         } else {
 769                 /*
 770                  * This happens with devices which are explicitly bound
 771                  * instead of being discovered through usb_scan_device()
 772                  * such as sandbox emul devices.
 773                  */
 774                 udev->dev = dev;
 775                 udev->controller_dev = usb_get_bus(dev);
 776                 udev->devnum = plat->devnum;
 777
 778                 /*
 779                  * udev did not go through usb_scan_device(), so we need to
 780                  * select the config and read the config descriptors.
 781                  */
 782                 ret = usb_select_config(udev);
 783                 if (ret)
 784                         return ret;
 785         }
 786
 787         return 0;
 788 }
 789
 790 UCLASS_DRIVER(usb) = {
 791         .id             = UCLASS_USB,
 792         .name           = "usb",
 793         .flags          = DM_UC_FLAG_SEQ_ALIAS,
 794         .post_bind      = dm_scan_fdt_dev,
 795         .priv_auto_alloc_size = sizeof(struct usb_uclass_priv),
 796         .per_child_auto_alloc_size = sizeof(struct usb_device),
 797         .per_device_auto_alloc_size = sizeof(struct usb_bus_priv),
 798         .child_post_bind = usb_child_post_bind,
 799         .child_pre_probe = usb_child_pre_probe,
 800         .per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
 801 };
 802
 803 UCLASS_DRIVER(usb_dev_generic) = {
 804         .id             = UCLASS_USB_DEV_GENERIC,
 805         .name           = "usb_dev_generic",
 806 };
 807
 808 U_BOOT_DRIVER(usb_dev_generic_drv) = {
 809         .id             = UCLASS_USB_DEV_GENERIC,
 810         .name           = "usb_dev_generic_drv",
 811 };