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