git.sur5r.net Git - u-boot/blob - 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 DECLARE_GLOBAL_DATA_PTR;
  20
  21 extern bool usb_started; /* flag for the started/stopped USB status */
  22 static bool asynch_allowed;
  23
  24 struct usb_uclass_priv {
  25         int companion_device_count;
  26 };
  27
  28 int usb_disable_asynch(int disable)
  29 {
  30         int old_value = asynch_allowed;
  31
  32         asynch_allowed = !disable;
  33         return old_value;
  34 }
  35
  36 int submit_int_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
  37                    int length, int interval)
  38 {
  39         struct udevice *bus = udev->controller_dev;
  40         struct dm_usb_ops *ops = usb_get_ops(bus);
  41
  42         if (!ops->interrupt)
  43                 return -ENOSYS;
  44
  45         return ops->interrupt(bus, udev, pipe, buffer, length, interval);
  46 }
  47
  48 int submit_control_msg(struct usb_device *udev, unsigned long pipe,
  49                        void *buffer, int length, struct devrequest *setup)
  50 {
  51         struct udevice *bus = udev->controller_dev;
  52         struct dm_usb_ops *ops = usb_get_ops(bus);
  53         struct usb_uclass_priv *uc_priv = bus->uclass->priv;
  54         int err;
  55
  56         if (!ops->control)
  57                 return -ENOSYS;
  58
  59         err = ops->control(bus, udev, pipe, buffer, length, setup);
  60         if (setup->request == USB_REQ_SET_FEATURE &&
  61             setup->requesttype == USB_RT_PORT &&
  62             setup->value == cpu_to_le16(USB_PORT_FEAT_RESET) &&
  63             err == -ENXIO) {
  64                 /* Device handed over to companion after port reset */
  65                 uc_priv->companion_device_count++;
  66         }
  67
  68         return err;
  69 }
  70
  71 int submit_bulk_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
  72                     int length)
  73 {
  74         struct udevice *bus = udev->controller_dev;
  75         struct dm_usb_ops *ops = usb_get_ops(bus);
  76
  77         if (!ops->bulk)
  78                 return -ENOSYS;
  79
  80         return ops->bulk(bus, udev, pipe, buffer, length);
  81 }
  82
  83 struct int_queue *create_int_queue(struct usb_device *udev,
  84                 unsigned long pipe, int queuesize, int elementsize,
  85                 void *buffer, int interval)
  86 {
  87         struct udevice *bus = udev->controller_dev;
  88         struct dm_usb_ops *ops = usb_get_ops(bus);
  89
  90         if (!ops->create_int_queue)
  91                 return NULL;
  92
  93         return ops->create_int_queue(bus, udev, pipe, queuesize, elementsize,
  94                                      buffer, interval);
  95 }
  96
  97 void *poll_int_queue(struct usb_device *udev, struct int_queue *queue)
  98 {
  99         struct udevice *bus = udev->controller_dev;
 100         struct dm_usb_ops *ops = usb_get_ops(bus);
 101
 102         if (!ops->poll_int_queue)
 103                 return NULL;
 104
 105         return ops->poll_int_queue(bus, udev, queue);
 106 }
 107
 108 int destroy_int_queue(struct usb_device *udev, struct int_queue *queue)
 109 {
 110         struct udevice *bus = udev->controller_dev;
 111         struct dm_usb_ops *ops = usb_get_ops(bus);
 112
 113         if (!ops->destroy_int_queue)
 114                 return -ENOSYS;
 115
 116         return ops->destroy_int_queue(bus, udev, queue);
 117 }
 118
 119 int usb_alloc_device(struct usb_device *udev)
 120 {
 121         struct udevice *bus = udev->controller_dev;
 122         struct dm_usb_ops *ops = usb_get_ops(bus);
 123
 124         /* This is only requird by some controllers - current XHCI */
 125         if (!ops->alloc_device)
 126                 return 0;
 127
 128         return ops->alloc_device(bus, udev);
 129 }
 130
 131 int usb_reset_root_port(struct usb_device *udev)
 132 {
 133         struct udevice *bus = udev->controller_dev;
 134         struct dm_usb_ops *ops = usb_get_ops(bus);
 135
 136         if (!ops->reset_root_port)
 137                 return -ENOSYS;
 138
 139         return ops->reset_root_port(bus, udev);
 140 }
 141
 142 int usb_update_hub_device(struct usb_device *udev)
 143 {
 144         struct udevice *bus = udev->controller_dev;
 145         struct dm_usb_ops *ops = usb_get_ops(bus);
 146
 147         if (!ops->update_hub_device)
 148                 return -ENOSYS;
 149
 150         return ops->update_hub_device(bus, udev);
 151 }
 152
 153 int usb_get_max_xfer_size(struct usb_device *udev, size_t *size)
 154 {
 155         struct udevice *bus = udev->controller_dev;
 156         struct dm_usb_ops *ops = usb_get_ops(bus);
 157
 158         if (!ops->get_max_xfer_size)
 159                 return -ENOSYS;
 160
 161         return ops->get_max_xfer_size(bus, size);
 162 }
 163
 164 int usb_stop(void)
 165 {
 166         struct udevice *bus;
 167         struct udevice *rh;
 168         struct uclass *uc;
 169         struct usb_uclass_priv *uc_priv;
 170         int err = 0, ret;
 171
 172         /* De-activate any devices that have been activated */
 173         ret = uclass_get(UCLASS_USB, &uc);
 174         if (ret)
 175                 return ret;
 176
 177         uc_priv = uc->priv;
 178
 179         uclass_foreach_dev(bus, uc) {
 180                 ret = device_remove(bus, DM_REMOVE_NORMAL);
 181                 if (ret && !err)
 182                         err = ret;
 183
 184                 /* Locate root hub device */
 185                 device_find_first_child(bus, &rh);
 186                 if (rh) {
 187                         /*
 188                          * All USB devices are children of root hub.
 189                          * Unbinding root hub will unbind all of its children.
 190                          */
 191                         ret = device_unbind(rh);
 192                         if (ret && !err)
 193                                 err = ret;
 194                 }
 195         }
 196
 197 #ifdef CONFIG_USB_STORAGE
 198         usb_stor_reset();
 199 #endif
 200         uc_priv->companion_device_count = 0;
 201         usb_started = 0;
 202
 203         return err;
 204 }
 205
 206 static void usb_scan_bus(struct udevice *bus, bool recurse)
 207 {
 208         struct usb_bus_priv *priv;
 209         struct udevice *dev;
 210         int ret;
 211
 212         priv = dev_get_uclass_priv(bus);
 213
 214         assert(recurse);        /* TODO: Support non-recusive */
 215
 216         printf("scanning bus %d for devices... ", bus->seq);
 217         debug("\n");
 218         ret = usb_scan_device(bus, 0, USB_SPEED_FULL, &dev);
 219         if (ret)
 220                 printf("failed, error %d\n", ret);
 221         else if (priv->next_addr == 0)
 222                 printf("No USB Device found\n");
 223         else
 224                 printf("%d USB Device(s) found\n", priv->next_addr);
 225 }
 226
 227 static void remove_inactive_children(struct uclass *uc, struct udevice *bus)
 228 {
 229         uclass_foreach_dev(bus, uc) {
 230                 struct udevice *dev, *next;
 231
 232                 if (!device_active(bus))
 233                         continue;
 234                 device_foreach_child_safe(dev, next, bus) {
 235                         if (!device_active(dev))
 236                                 device_unbind(dev);
 237                 }
 238         }
 239 }
 240
 241 int usb_init(void)
 242 {
 243         int controllers_initialized = 0;
 244         struct usb_uclass_priv *uc_priv;
 245         struct usb_bus_priv *priv;
 246         struct udevice *bus;
 247         struct uclass *uc;
 248         int count = 0;
 249         int ret;
 250
 251         asynch_allowed = 1;
 252
 253         ret = uclass_get(UCLASS_USB, &uc);
 254         if (ret)
 255                 return ret;
 256
 257         uc_priv = uc->priv;
 258
 259         uclass_foreach_dev(bus, uc) {
 260                 /* init low_level USB */
 261                 printf("USB%d:   ", count);
 262                 count++;
 263
 264 #ifdef CONFIG_SANDBOX
 265                 /*
 266                  * For Sandbox, we need scan the device tree each time when we
 267                  * start the USB stack, in order to re-create the emulated USB
 268                  * devices and bind drivers for them before we actually do the
 269                  * driver probe.
 270                  */
 271                 ret = dm_scan_fdt_dev(bus);
 272                 if (ret) {
 273                         printf("Sandbox USB device scan failed (%d)\n", ret);
 274                         continue;
 275                 }
 276 #endif
 277
 278                 ret = device_probe(bus);
 279                 if (ret == -ENODEV) {   /* No such device. */
 280                         puts("Port not available.\n");
 281                         controllers_initialized++;
 282                         continue;
 283                 }
 284
 285                 if (ret) {              /* Other error. */
 286                         printf("probe failed, error %d\n", ret);
 287                         continue;
 288                 }
 289                 controllers_initialized++;
 290                 usb_started = true;
 291         }
 292
 293         /*
 294          * lowlevel init done, now scan the bus for devices i.e. search HUBs
 295          * and configure them, first scan primary controllers.
 296          */
 297         uclass_foreach_dev(bus, uc) {
 298                 if (!device_active(bus))
 299                         continue;
 300
 301                 priv = dev_get_uclass_priv(bus);
 302                 if (!priv->companion)
 303                         usb_scan_bus(bus, true);
 304         }
 305
 306         /*
 307          * Now that the primary controllers have been scanned and have handed
 308          * over any devices they do not understand to their companions, scan
 309          * the companions if necessary.
 310          */
 311         if (uc_priv->companion_device_count) {
 312                 uclass_foreach_dev(bus, uc) {
 313                         if (!device_active(bus))
 314                                 continue;
 315
 316                         priv = dev_get_uclass_priv(bus);
 317                         if (priv->companion)
 318                                 usb_scan_bus(bus, true);
 319                 }
 320         }
 321
 322         debug("scan end\n");
 323
 324         /* Remove any devices that were not found on this scan */
 325         remove_inactive_children(uc, bus);
 326
 327         ret = uclass_get(UCLASS_USB_HUB, &uc);
 328         if (ret)
 329                 return ret;
 330         remove_inactive_children(uc, bus);
 331
 332         /* if we were not able to find at least one working bus, bail out */
 333         if (!count)
 334                 printf("No controllers found\n");
 335         else if (controllers_initialized == 0)
 336                 printf("USB error: all controllers failed lowlevel init\n");
 337
 338         return usb_started ? 0 : -1;
 339 }
 340
 341 /*
 342  * TODO(sjg@chromium.org): Remove this legacy function. At present it is needed
 343  * to support boards which use driver model for USB but not Ethernet, and want
 344  * to use USB Ethernet.
 345  *
 346  * The #if clause is here to ensure that remains the only case.
 347  */
 348 #if !defined(CONFIG_DM_ETH) && defined(CONFIG_USB_HOST_ETHER)
 349 static struct usb_device *find_child_devnum(struct udevice *parent, int devnum)
 350 {
 351         struct usb_device *udev;
 352         struct udevice *dev;
 353
 354         if (!device_active(parent))
 355                 return NULL;
 356         udev = dev_get_parent_priv(parent);
 357         if (udev->devnum == devnum)
 358                 return udev;
 359
 360         for (device_find_first_child(parent, &dev);
 361              dev;
 362              device_find_next_child(&dev)) {
 363                 udev = find_child_devnum(dev, devnum);
 364                 if (udev)
 365                         return udev;
 366         }
 367
 368         return NULL;
 369 }
 370
 371 struct usb_device *usb_get_dev_index(struct udevice *bus, int index)
 372 {
 373         struct udevice *dev;
 374         int devnum = index + 1; /* Addresses are allocated from 1 on USB */
 375
 376         device_find_first_child(bus, &dev);
 377         if (!dev)
 378                 return NULL;
 379
 380         return find_child_devnum(dev, devnum);
 381 }
 382 #endif
 383
 384 int usb_setup_ehci_gadget(struct ehci_ctrl **ctlrp)
 385 {
 386         struct usb_platdata *plat;
 387         struct udevice *dev;
 388         int ret;
 389
 390         /* Find the old device and remove it */
 391         ret = uclass_find_device_by_seq(UCLASS_USB, 0, true, &dev);
 392         if (ret)
 393                 return ret;
 394         ret = device_remove(dev, DM_REMOVE_NORMAL);
 395         if (ret)
 396                 return ret;
 397
 398         plat = dev_get_platdata(dev);
 399         plat->init_type = USB_INIT_DEVICE;
 400         ret = device_probe(dev);
 401         if (ret)
 402                 return ret;
 403         *ctlrp = dev_get_priv(dev);
 404
 405         return 0;
 406 }
 407
 408 /* returns 0 if no match, 1 if match */
 409 static int usb_match_device(const struct usb_device_descriptor *desc,
 410                             const struct usb_device_id *id)
 411 {
 412         if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
 413             id->idVendor != le16_to_cpu(desc->idVendor))
 414                 return 0;
 415
 416         if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
 417             id->idProduct != le16_to_cpu(desc->idProduct))
 418                 return 0;
 419
 420         /* No need to test id->bcdDevice_lo != 0, since 0 is never
 421            greater than any unsigned number. */
 422         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
 423             (id->bcdDevice_lo > le16_to_cpu(desc->bcdDevice)))
 424                 return 0;
 425
 426         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
 427             (id->bcdDevice_hi < le16_to_cpu(desc->bcdDevice)))
 428                 return 0;
 429
 430         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
 431             (id->bDeviceClass != desc->bDeviceClass))
 432                 return 0;
 433
 434         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
 435             (id->bDeviceSubClass != desc->bDeviceSubClass))
 436                 return 0;
 437
 438         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
 439             (id->bDeviceProtocol != desc->bDeviceProtocol))
 440                 return 0;
 441
 442         return 1;
 443 }
 444
 445 /* returns 0 if no match, 1 if match */
 446 static int usb_match_one_id_intf(const struct usb_device_descriptor *desc,
 447                         const struct usb_interface_descriptor *int_desc,
 448                         const struct usb_device_id *id)
 449 {
 450         /* The interface class, subclass, protocol and number should never be
 451          * checked for a match if the device class is Vendor Specific,
 452          * unless the match record specifies the Vendor ID. */
 453         if (desc->bDeviceClass == USB_CLASS_VENDOR_SPEC &&
 454             !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
 455             (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS |
 456                                 USB_DEVICE_ID_MATCH_INT_SUBCLASS |
 457                                 USB_DEVICE_ID_MATCH_INT_PROTOCOL |
 458                                 USB_DEVICE_ID_MATCH_INT_NUMBER)))
 459                 return 0;
 460
 461         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
 462             (id->bInterfaceClass != int_desc->bInterfaceClass))
 463                 return 0;
 464
 465         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) &&
 466             (id->bInterfaceSubClass != int_desc->bInterfaceSubClass))
 467                 return 0;
 468
 469         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) &&
 470             (id->bInterfaceProtocol != int_desc->bInterfaceProtocol))
 471                 return 0;
 472
 473         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_NUMBER) &&
 474             (id->bInterfaceNumber != int_desc->bInterfaceNumber))
 475                 return 0;
 476
 477         return 1;
 478 }
 479
 480 /* returns 0 if no match, 1 if match */
 481 static int usb_match_one_id(struct usb_device_descriptor *desc,
 482                             struct usb_interface_descriptor *int_desc,
 483                             const struct usb_device_id *id)
 484 {
 485         if (!usb_match_device(desc, id))
 486                 return 0;
 487
 488         return usb_match_one_id_intf(desc, int_desc, id);
 489 }
 490
 491 /**
 492  * usb_find_and_bind_driver() - Find and bind the right USB driver
 493  *
 494  * This only looks at certain fields in the descriptor.
 495  */
 496 static int usb_find_and_bind_driver(struct udevice *parent,
 497                                     struct usb_device_descriptor *desc,
 498                                     struct usb_interface_descriptor *iface,
 499                                     int bus_seq, int devnum,
 500                                     struct udevice **devp)
 501 {
 502         struct usb_driver_entry *start, *entry;
 503         int n_ents;
 504         int ret;
 505         char name[30], *str;
 506
 507         *devp = NULL;
 508         debug("%s: Searching for driver\n", __func__);
 509         start = ll_entry_start(struct usb_driver_entry, usb_driver_entry);
 510         n_ents = ll_entry_count(struct usb_driver_entry, usb_driver_entry);
 511         for (entry = start; entry != start + n_ents; entry++) {
 512                 const struct usb_device_id *id;
 513                 struct udevice *dev;
 514                 const struct driver *drv;
 515                 struct usb_dev_platdata *plat;
 516
 517                 for (id = entry->match; id->match_flags; id++) {
 518                         if (!usb_match_one_id(desc, iface, id))
 519                                 continue;
 520
 521                         drv = entry->driver;
 522                         /*
 523                          * We could pass the descriptor to the driver as
 524                          * platdata (instead of NULL) and allow its bind()
 525                          * method to return -ENOENT if it doesn't support this
 526                          * device. That way we could continue the search to
 527                          * find another driver. For now this doesn't seem
 528                          * necesssary, so just bind the first match.
 529                          */
 530                         ret = device_bind(parent, drv, drv->name, NULL, -1,
 531                                           &dev);
 532                         if (ret)
 533                                 goto error;
 534                         debug("%s: Match found: %s\n", __func__, drv->name);
 535                         dev->driver_data = id->driver_info;
 536                         plat = dev_get_parent_platdata(dev);
 537                         plat->id = *id;
 538                         *devp = dev;
 539                         return 0;
 540                 }
 541         }
 542
 543         /* Bind a generic driver so that the device can be used */
 544         snprintf(name, sizeof(name), "generic_bus_%x_dev_%x", bus_seq, devnum);
 545         str = strdup(name);
 546         if (!str)
 547                 return -ENOMEM;
 548         ret = device_bind_driver(parent, "usb_dev_generic_drv", str, devp);
 549
 550 error:
 551         debug("%s: No match found: %d\n", __func__, ret);
 552         return ret;
 553 }
 554
 555 /**
 556  * usb_find_child() - Find an existing device which matches our needs
 557  *
 558  *
 559  */
 560 static int usb_find_child(struct udevice *parent,
 561                           struct usb_device_descriptor *desc,
 562                           struct usb_interface_descriptor *iface,
 563                           struct udevice **devp)
 564 {
 565         struct udevice *dev;
 566
 567         *devp = NULL;
 568         for (device_find_first_child(parent, &dev);
 569              dev;
 570              device_find_next_child(&dev)) {
 571                 struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 572
 573                 /* If this device is already in use, skip it */
 574                 if (device_active(dev))
 575                         continue;
 576                 debug("   %s: name='%s', plat=%d, desc=%d\n", __func__,
 577                       dev->name, plat->id.bDeviceClass, desc->bDeviceClass);
 578                 if (usb_match_one_id(desc, iface, &plat->id)) {
 579                         *devp = dev;
 580                         return 0;
 581                 }
 582         }
 583
 584         return -ENOENT;
 585 }
 586
 587 int usb_scan_device(struct udevice *parent, int port,
 588                     enum usb_device_speed speed, struct udevice **devp)
 589 {
 590         struct udevice *dev;
 591         bool created = false;
 592         struct usb_dev_platdata *plat;
 593         struct usb_bus_priv *priv;
 594         struct usb_device *parent_udev;
 595         int ret;
 596         ALLOC_CACHE_ALIGN_BUFFER(struct usb_device, udev, 1);
 597         struct usb_interface_descriptor *iface = &udev->config.if_desc[0].desc;
 598
 599         *devp = NULL;
 600         memset(udev, '\0', sizeof(*udev));
 601         udev->controller_dev = usb_get_bus(parent);
 602         priv = dev_get_uclass_priv(udev->controller_dev);
 603
 604         /*
 605          * Somewhat nasty, this. We create a local device and use the normal
 606          * USB stack to read its descriptor. Then we know what type of device
 607          * to create for real.
 608          *
 609          * udev->dev is set to the parent, since we don't have a real device
 610          * yet. The USB stack should not access udev.dev anyway, except perhaps
 611          * to find the controller, and the controller will either be @parent,
 612          * or some parent of @parent.
 613          *
 614          * Another option might be to create the device as a generic USB
 615          * device, then morph it into the correct one when we know what it
 616          * should be. This means that a generic USB device would morph into
 617          * a network controller, or a USB flash stick, for example. However,
 618          * we don't support such morphing and it isn't clear that it would
 619          * be easy to do.
 620          *
 621          * Yet another option is to split out the USB stack parts of udev
 622          * into something like a 'struct urb' (as Linux does) which can exist
 623          * independently of any device. This feels cleaner, but calls for quite
 624          * a big change to the USB stack.
 625          *
 626          * For now, the approach is to set up an empty udev, read its
 627          * descriptor and assign it an address, then bind a real device and
 628          * stash the resulting information into the device's parent
 629          * platform data. Then when we probe it, usb_child_pre_probe() is called
 630          * and it will pull the information out of the stash.
 631          */
 632         udev->dev = parent;
 633         udev->speed = speed;
 634         udev->devnum = priv->next_addr + 1;
 635         udev->portnr = port;
 636         debug("Calling usb_setup_device(), portnr=%d\n", udev->portnr);
 637         parent_udev = device_get_uclass_id(parent) == UCLASS_USB_HUB ?
 638                 dev_get_parent_priv(parent) : NULL;
 639         ret = usb_setup_device(udev, priv->desc_before_addr, parent_udev);
 640         debug("read_descriptor for '%s': ret=%d\n", parent->name, ret);
 641         if (ret)
 642                 return ret;
 643         ret = usb_find_child(parent, &udev->descriptor, iface, &dev);
 644         debug("** usb_find_child returns %d\n", ret);
 645         if (ret) {
 646                 if (ret != -ENOENT)
 647                         return ret;
 648                 ret = usb_find_and_bind_driver(parent, &udev->descriptor, iface,
 649                                                udev->controller_dev->seq,
 650                                                udev->devnum, &dev);
 651                 if (ret)
 652                         return ret;
 653                 created = true;
 654         }
 655         plat = dev_get_parent_platdata(dev);
 656         debug("%s: Probing '%s', plat=%p\n", __func__, dev->name, plat);
 657         plat->devnum = udev->devnum;
 658         plat->udev = udev;
 659         priv->next_addr++;
 660         ret = device_probe(dev);
 661         if (ret) {
 662                 debug("%s: Device '%s' probe failed\n", __func__, dev->name);
 663                 priv->next_addr--;
 664                 if (created)
 665                         device_unbind(dev);
 666                 return ret;
 667         }
 668         *devp = dev;
 669
 670         return 0;
 671 }
 672
 673 /*
 674  * Detect if a USB device has been plugged or unplugged.
 675  */
 676 int usb_detect_change(void)
 677 {
 678         struct udevice *hub;
 679         struct uclass *uc;
 680         int change = 0;
 681         int ret;
 682
 683         ret = uclass_get(UCLASS_USB_HUB, &uc);
 684         if (ret)
 685                 return ret;
 686
 687         uclass_foreach_dev(hub, uc) {
 688                 struct usb_device *udev;
 689                 struct udevice *dev;
 690
 691                 if (!device_active(hub))
 692                         continue;
 693                 for (device_find_first_child(hub, &dev);
 694                      dev;
 695                      device_find_next_child(&dev)) {
 696                         struct usb_port_status status;
 697
 698                         if (!device_active(dev))
 699                                 continue;
 700
 701                         udev = dev_get_parent_priv(dev);
 702                         if (usb_get_port_status(udev, udev->portnr, &status)
 703                                         < 0)
 704                                 /* USB request failed */
 705                                 continue;
 706
 707                         if (le16_to_cpu(status.wPortChange) &
 708                             USB_PORT_STAT_C_CONNECTION)
 709                                 change++;
 710                 }
 711         }
 712
 713         return change;
 714 }
 715
 716 static int usb_child_post_bind(struct udevice *dev)
 717 {
 718         struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 719         int val;
 720
 721         if (!dev_of_valid(dev))
 722                 return 0;
 723
 724         /* We only support matching a few things */
 725         val = dev_read_u32_default(dev, "usb,device-class", -1);
 726         if (val != -1) {
 727                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_DEV_CLASS;
 728                 plat->id.bDeviceClass = val;
 729         }
 730         val = dev_read_u32_default(dev, "usb,interface-class", -1);
 731         if (val != -1) {
 732                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_INT_CLASS;
 733                 plat->id.bInterfaceClass = val;
 734         }
 735
 736         return 0;
 737 }
 738
 739 struct udevice *usb_get_bus(struct udevice *dev)
 740 {
 741         struct udevice *bus;
 742
 743         for (bus = dev; bus && device_get_uclass_id(bus) != UCLASS_USB; )
 744                 bus = bus->parent;
 745         if (!bus) {
 746                 /* By design this cannot happen */
 747                 assert(bus);
 748                 debug("USB HUB '%s' does not have a controller\n", dev->name);
 749         }
 750
 751         return bus;
 752 }
 753
 754 int usb_child_pre_probe(struct udevice *dev)
 755 {
 756         struct usb_device *udev = dev_get_parent_priv(dev);
 757         struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 758         int ret;
 759
 760         if (plat->udev) {
 761                 /*
 762                  * Copy over all the values set in the on stack struct
 763                  * usb_device in usb_scan_device() to our final struct
 764                  * usb_device for this dev.
 765                  */
 766                 *udev = *(plat->udev);
 767                 /* And clear plat->udev as it will not be valid for long */
 768                 plat->udev = NULL;
 769                 udev->dev = dev;
 770         } else {
 771                 /*
 772                  * This happens with devices which are explicitly bound
 773                  * instead of being discovered through usb_scan_device()
 774                  * such as sandbox emul devices.
 775                  */
 776                 udev->dev = dev;
 777                 udev->controller_dev = usb_get_bus(dev);
 778                 udev->devnum = plat->devnum;
 779
 780                 /*
 781                  * udev did not go through usb_scan_device(), so we need to
 782                  * select the config and read the config descriptors.
 783                  */
 784                 ret = usb_select_config(udev);
 785                 if (ret)
 786                         return ret;
 787         }
 788
 789         return 0;
 790 }
 791
 792 UCLASS_DRIVER(usb) = {
 793         .id             = UCLASS_USB,
 794         .name           = "usb",
 795         .flags          = DM_UC_FLAG_SEQ_ALIAS,
 796         .post_bind      = dm_scan_fdt_dev,
 797         .priv_auto_alloc_size = sizeof(struct usb_uclass_priv),
 798         .per_child_auto_alloc_size = sizeof(struct usb_device),
 799         .per_device_auto_alloc_size = sizeof(struct usb_bus_priv),
 800         .child_post_bind = usb_child_post_bind,
 801         .child_pre_probe = usb_child_pre_probe,
 802         .per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
 803 };
 804
 805 UCLASS_DRIVER(usb_dev_generic) = {
 806         .id             = UCLASS_USB_DEV_GENERIC,
 807         .name           = "usb_dev_generic",
 808 };
 809
 810 U_BOOT_DRIVER(usb_dev_generic_drv) = {
 811         .id             = UCLASS_USB_DEV_GENERIC,
 812         .name           = "usb_dev_generic_drv",
 813 };