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