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 #ifdef CONFIG_BLK
 197         ret = blk_unbind_all(IF_TYPE_USB);
 198         if (ret && !err)
 199                 err = ret;
 200 #endif
 201 #ifdef CONFIG_SANDBOX
 202         struct udevice *dev;
 203
 204         /* Reset all enulation devices */
 205         ret = uclass_get(UCLASS_USB_EMUL, &uc);
 206         if (ret)
 207                 return ret;
 208
 209         uclass_foreach_dev(dev, uc)
 210                 usb_emul_reset(dev);
 211 #endif
 212 #ifdef CONFIG_USB_STORAGE
 213         usb_stor_reset();
 214 #endif
 215         uc_priv->companion_device_count = 0;
 216         usb_started = 0;
 217
 218         return err;
 219 }
 220
 221 static void usb_scan_bus(struct udevice *bus, bool recurse)
 222 {
 223         struct usb_bus_priv *priv;
 224         struct udevice *dev;
 225         int ret;
 226
 227         priv = dev_get_uclass_priv(bus);
 228
 229         assert(recurse);        /* TODO: Support non-recusive */
 230
 231         printf("scanning bus %d for devices... ", bus->seq);
 232         debug("\n");
 233         ret = usb_scan_device(bus, 0, USB_SPEED_FULL, &dev);
 234         if (ret)
 235                 printf("failed, error %d\n", ret);
 236         else if (priv->next_addr == 0)
 237                 printf("No USB Device found\n");
 238         else
 239                 printf("%d USB Device(s) found\n", priv->next_addr);
 240 }
 241
 242 static void remove_inactive_children(struct uclass *uc, struct udevice *bus)
 243 {
 244         uclass_foreach_dev(bus, uc) {
 245                 struct udevice *dev, *next;
 246
 247                 if (!device_active(bus))
 248                         continue;
 249                 device_foreach_child_safe(dev, next, bus) {
 250                         if (!device_active(dev))
 251                                 device_unbind(dev);
 252                 }
 253         }
 254 }
 255
 256 int usb_init(void)
 257 {
 258         int controllers_initialized = 0;
 259         struct usb_uclass_priv *uc_priv;
 260         struct usb_bus_priv *priv;
 261         struct udevice *bus;
 262         struct uclass *uc;
 263         int count = 0;
 264         int ret;
 265
 266         asynch_allowed = 1;
 267
 268         ret = uclass_get(UCLASS_USB, &uc);
 269         if (ret)
 270                 return ret;
 271
 272         uc_priv = uc->priv;
 273
 274         uclass_foreach_dev(bus, uc) {
 275                 /* init low_level USB */
 276                 printf("USB%d:   ", count);
 277                 count++;
 278
 279 #ifdef CONFIG_SANDBOX
 280                 /*
 281                  * For Sandbox, we need scan the device tree each time when we
 282                  * start the USB stack, in order to re-create the emulated USB
 283                  * devices and bind drivers for them before we actually do the
 284                  * driver probe.
 285                  */
 286                 ret = dm_scan_fdt_dev(bus);
 287                 if (ret) {
 288                         printf("Sandbox USB device scan failed (%d)\n", ret);
 289                         continue;
 290                 }
 291 #endif
 292
 293                 ret = device_probe(bus);
 294                 if (ret == -ENODEV) {   /* No such device. */
 295                         puts("Port not available.\n");
 296                         controllers_initialized++;
 297                         continue;
 298                 }
 299
 300                 if (ret) {              /* Other error. */
 301                         printf("probe failed, error %d\n", ret);
 302                         continue;
 303                 }
 304                 controllers_initialized++;
 305                 usb_started = true;
 306         }
 307
 308         /*
 309          * lowlevel init done, now scan the bus for devices i.e. search HUBs
 310          * and configure them, first scan primary controllers.
 311          */
 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          * Now that the primary controllers have been scanned and have handed
 323          * over any devices they do not understand to their companions, scan
 324          * the companions if necessary.
 325          */
 326         if (uc_priv->companion_device_count) {
 327                 uclass_foreach_dev(bus, uc) {
 328                         if (!device_active(bus))
 329                                 continue;
 330
 331                         priv = dev_get_uclass_priv(bus);
 332                         if (priv->companion)
 333                                 usb_scan_bus(bus, true);
 334                 }
 335         }
 336
 337         debug("scan end\n");
 338
 339         /* Remove any devices that were not found on this scan */
 340         remove_inactive_children(uc, bus);
 341
 342         ret = uclass_get(UCLASS_USB_HUB, &uc);
 343         if (ret)
 344                 return ret;
 345         remove_inactive_children(uc, bus);
 346
 347         /* if we were not able to find at least one working bus, bail out */
 348         if (!count)
 349                 printf("No controllers found\n");
 350         else if (controllers_initialized == 0)
 351                 printf("USB error: all controllers failed lowlevel init\n");
 352
 353         return usb_started ? 0 : -1;
 354 }
 355
 356 /*
 357  * TODO(sjg@chromium.org): Remove this legacy function. At present it is needed
 358  * to support boards which use driver model for USB but not Ethernet, and want
 359  * to use USB Ethernet.
 360  *
 361  * The #if clause is here to ensure that remains the only case.
 362  */
 363 #if !defined(CONFIG_DM_ETH) && defined(CONFIG_USB_HOST_ETHER)
 364 static struct usb_device *find_child_devnum(struct udevice *parent, int devnum)
 365 {
 366         struct usb_device *udev;
 367         struct udevice *dev;
 368
 369         if (!device_active(parent))
 370                 return NULL;
 371         udev = dev_get_parent_priv(parent);
 372         if (udev->devnum == devnum)
 373                 return udev;
 374
 375         for (device_find_first_child(parent, &dev);
 376              dev;
 377              device_find_next_child(&dev)) {
 378                 udev = find_child_devnum(dev, devnum);
 379                 if (udev)
 380                         return udev;
 381         }
 382
 383         return NULL;
 384 }
 385
 386 struct usb_device *usb_get_dev_index(struct udevice *bus, int index)
 387 {
 388         struct udevice *dev;
 389         int devnum = index + 1; /* Addresses are allocated from 1 on USB */
 390
 391         device_find_first_child(bus, &dev);
 392         if (!dev)
 393                 return NULL;
 394
 395         return find_child_devnum(dev, devnum);
 396 }
 397 #endif
 398
 399 int usb_setup_ehci_gadget(struct ehci_ctrl **ctlrp)
 400 {
 401         struct usb_platdata *plat;
 402         struct udevice *dev;
 403         int ret;
 404
 405         /* Find the old device and remove it */
 406         ret = uclass_find_device_by_seq(UCLASS_USB, 0, true, &dev);
 407         if (ret)
 408                 return ret;
 409         ret = device_remove(dev, DM_REMOVE_NORMAL);
 410         if (ret)
 411                 return ret;
 412
 413         plat = dev_get_platdata(dev);
 414         plat->init_type = USB_INIT_DEVICE;
 415         ret = device_probe(dev);
 416         if (ret)
 417                 return ret;
 418         *ctlrp = dev_get_priv(dev);
 419
 420         return 0;
 421 }
 422
 423 /* returns 0 if no match, 1 if match */
 424 static int usb_match_device(const struct usb_device_descriptor *desc,
 425                             const struct usb_device_id *id)
 426 {
 427         if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
 428             id->idVendor != le16_to_cpu(desc->idVendor))
 429                 return 0;
 430
 431         if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
 432             id->idProduct != le16_to_cpu(desc->idProduct))
 433                 return 0;
 434
 435         /* No need to test id->bcdDevice_lo != 0, since 0 is never
 436            greater than any unsigned number. */
 437         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
 438             (id->bcdDevice_lo > le16_to_cpu(desc->bcdDevice)))
 439                 return 0;
 440
 441         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
 442             (id->bcdDevice_hi < le16_to_cpu(desc->bcdDevice)))
 443                 return 0;
 444
 445         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
 446             (id->bDeviceClass != desc->bDeviceClass))
 447                 return 0;
 448
 449         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
 450             (id->bDeviceSubClass != desc->bDeviceSubClass))
 451                 return 0;
 452
 453         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
 454             (id->bDeviceProtocol != desc->bDeviceProtocol))
 455                 return 0;
 456
 457         return 1;
 458 }
 459
 460 /* returns 0 if no match, 1 if match */
 461 static int usb_match_one_id_intf(const struct usb_device_descriptor *desc,
 462                         const struct usb_interface_descriptor *int_desc,
 463                         const struct usb_device_id *id)
 464 {
 465         /* The interface class, subclass, protocol and number should never be
 466          * checked for a match if the device class is Vendor Specific,
 467          * unless the match record specifies the Vendor ID. */
 468         if (desc->bDeviceClass == USB_CLASS_VENDOR_SPEC &&
 469             !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
 470             (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS |
 471                                 USB_DEVICE_ID_MATCH_INT_SUBCLASS |
 472                                 USB_DEVICE_ID_MATCH_INT_PROTOCOL |
 473                                 USB_DEVICE_ID_MATCH_INT_NUMBER)))
 474                 return 0;
 475
 476         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
 477             (id->bInterfaceClass != int_desc->bInterfaceClass))
 478                 return 0;
 479
 480         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) &&
 481             (id->bInterfaceSubClass != int_desc->bInterfaceSubClass))
 482                 return 0;
 483
 484         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) &&
 485             (id->bInterfaceProtocol != int_desc->bInterfaceProtocol))
 486                 return 0;
 487
 488         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_NUMBER) &&
 489             (id->bInterfaceNumber != int_desc->bInterfaceNumber))
 490                 return 0;
 491
 492         return 1;
 493 }
 494
 495 /* returns 0 if no match, 1 if match */
 496 static int usb_match_one_id(struct usb_device_descriptor *desc,
 497                             struct usb_interface_descriptor *int_desc,
 498                             const struct usb_device_id *id)
 499 {
 500         if (!usb_match_device(desc, id))
 501                 return 0;
 502
 503         return usb_match_one_id_intf(desc, int_desc, id);
 504 }
 505
 506 /**
 507  * usb_find_and_bind_driver() - Find and bind the right USB driver
 508  *
 509  * This only looks at certain fields in the descriptor.
 510  */
 511 static int usb_find_and_bind_driver(struct udevice *parent,
 512                                     struct usb_device_descriptor *desc,
 513                                     struct usb_interface_descriptor *iface,
 514                                     int bus_seq, int devnum,
 515                                     struct udevice **devp)
 516 {
 517         struct usb_driver_entry *start, *entry;
 518         int n_ents;
 519         int ret;
 520         char name[30], *str;
 521
 522         *devp = NULL;
 523         debug("%s: Searching for driver\n", __func__);
 524         start = ll_entry_start(struct usb_driver_entry, usb_driver_entry);
 525         n_ents = ll_entry_count(struct usb_driver_entry, usb_driver_entry);
 526         for (entry = start; entry != start + n_ents; entry++) {
 527                 const struct usb_device_id *id;
 528                 struct udevice *dev;
 529                 const struct driver *drv;
 530                 struct usb_dev_platdata *plat;
 531
 532                 for (id = entry->match; id->match_flags; id++) {
 533                         if (!usb_match_one_id(desc, iface, id))
 534                                 continue;
 535
 536                         drv = entry->driver;
 537                         /*
 538                          * We could pass the descriptor to the driver as
 539                          * platdata (instead of NULL) and allow its bind()
 540                          * method to return -ENOENT if it doesn't support this
 541                          * device. That way we could continue the search to
 542                          * find another driver. For now this doesn't seem
 543                          * necesssary, so just bind the first match.
 544                          */
 545                         ret = device_bind(parent, drv, drv->name, NULL, -1,
 546                                           &dev);
 547                         if (ret)
 548                                 goto error;
 549                         debug("%s: Match found: %s\n", __func__, drv->name);
 550                         dev->driver_data = id->driver_info;
 551                         plat = dev_get_parent_platdata(dev);
 552                         plat->id = *id;
 553                         *devp = dev;
 554                         return 0;
 555                 }
 556         }
 557
 558         /* Bind a generic driver so that the device can be used */
 559         snprintf(name, sizeof(name), "generic_bus_%x_dev_%x", bus_seq, devnum);
 560         str = strdup(name);
 561         if (!str)
 562                 return -ENOMEM;
 563         ret = device_bind_driver(parent, "usb_dev_generic_drv", str, devp);
 564
 565 error:
 566         debug("%s: No match found: %d\n", __func__, ret);
 567         return ret;
 568 }
 569
 570 /**
 571  * usb_find_child() - Find an existing device which matches our needs
 572  *
 573  *
 574  */
 575 static int usb_find_child(struct udevice *parent,
 576                           struct usb_device_descriptor *desc,
 577                           struct usb_interface_descriptor *iface,
 578                           struct udevice **devp)
 579 {
 580         struct udevice *dev;
 581
 582         *devp = NULL;
 583         for (device_find_first_child(parent, &dev);
 584              dev;
 585              device_find_next_child(&dev)) {
 586                 struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 587
 588                 /* If this device is already in use, skip it */
 589                 if (device_active(dev))
 590                         continue;
 591                 debug("   %s: name='%s', plat=%d, desc=%d\n", __func__,
 592                       dev->name, plat->id.bDeviceClass, desc->bDeviceClass);
 593                 if (usb_match_one_id(desc, iface, &plat->id)) {
 594                         *devp = dev;
 595                         return 0;
 596                 }
 597         }
 598
 599         return -ENOENT;
 600 }
 601
 602 int usb_scan_device(struct udevice *parent, int port,
 603                     enum usb_device_speed speed, struct udevice **devp)
 604 {
 605         struct udevice *dev;
 606         bool created = false;
 607         struct usb_dev_platdata *plat;
 608         struct usb_bus_priv *priv;
 609         struct usb_device *parent_udev;
 610         int ret;
 611         ALLOC_CACHE_ALIGN_BUFFER(struct usb_device, udev, 1);
 612         struct usb_interface_descriptor *iface = &udev->config.if_desc[0].desc;
 613
 614         *devp = NULL;
 615         memset(udev, '\0', sizeof(*udev));
 616         udev->controller_dev = usb_get_bus(parent);
 617         priv = dev_get_uclass_priv(udev->controller_dev);
 618
 619         /*
 620          * Somewhat nasty, this. We create a local device and use the normal
 621          * USB stack to read its descriptor. Then we know what type of device
 622          * to create for real.
 623          *
 624          * udev->dev is set to the parent, since we don't have a real device
 625          * yet. The USB stack should not access udev.dev anyway, except perhaps
 626          * to find the controller, and the controller will either be @parent,
 627          * or some parent of @parent.
 628          *
 629          * Another option might be to create the device as a generic USB
 630          * device, then morph it into the correct one when we know what it
 631          * should be. This means that a generic USB device would morph into
 632          * a network controller, or a USB flash stick, for example. However,
 633          * we don't support such morphing and it isn't clear that it would
 634          * be easy to do.
 635          *
 636          * Yet another option is to split out the USB stack parts of udev
 637          * into something like a 'struct urb' (as Linux does) which can exist
 638          * independently of any device. This feels cleaner, but calls for quite
 639          * a big change to the USB stack.
 640          *
 641          * For now, the approach is to set up an empty udev, read its
 642          * descriptor and assign it an address, then bind a real device and
 643          * stash the resulting information into the device's parent
 644          * platform data. Then when we probe it, usb_child_pre_probe() is called
 645          * and it will pull the information out of the stash.
 646          */
 647         udev->dev = parent;
 648         udev->speed = speed;
 649         udev->devnum = priv->next_addr + 1;
 650         udev->portnr = port;
 651         debug("Calling usb_setup_device(), portnr=%d\n", udev->portnr);
 652         parent_udev = device_get_uclass_id(parent) == UCLASS_USB_HUB ?
 653                 dev_get_parent_priv(parent) : NULL;
 654         ret = usb_setup_device(udev, priv->desc_before_addr, parent_udev);
 655         debug("read_descriptor for '%s': ret=%d\n", parent->name, ret);
 656         if (ret)
 657                 return ret;
 658         ret = usb_find_child(parent, &udev->descriptor, iface, &dev);
 659         debug("** usb_find_child returns %d\n", ret);
 660         if (ret) {
 661                 if (ret != -ENOENT)
 662                         return ret;
 663                 ret = usb_find_and_bind_driver(parent, &udev->descriptor, iface,
 664                                                udev->controller_dev->seq,
 665                                                udev->devnum, &dev);
 666                 if (ret)
 667                         return ret;
 668                 created = true;
 669         }
 670         plat = dev_get_parent_platdata(dev);
 671         debug("%s: Probing '%s', plat=%p\n", __func__, dev->name, plat);
 672         plat->devnum = udev->devnum;
 673         plat->udev = udev;
 674         priv->next_addr++;
 675         ret = device_probe(dev);
 676         if (ret) {
 677                 debug("%s: Device '%s' probe failed\n", __func__, dev->name);
 678                 priv->next_addr--;
 679                 if (created)
 680                         device_unbind(dev);
 681                 return ret;
 682         }
 683         *devp = dev;
 684
 685         return 0;
 686 }
 687
 688 /*
 689  * Detect if a USB device has been plugged or unplugged.
 690  */
 691 int usb_detect_change(void)
 692 {
 693         struct udevice *hub;
 694         struct uclass *uc;
 695         int change = 0;
 696         int ret;
 697
 698         ret = uclass_get(UCLASS_USB_HUB, &uc);
 699         if (ret)
 700                 return ret;
 701
 702         uclass_foreach_dev(hub, uc) {
 703                 struct usb_device *udev;
 704                 struct udevice *dev;
 705
 706                 if (!device_active(hub))
 707                         continue;
 708                 for (device_find_first_child(hub, &dev);
 709                      dev;
 710                      device_find_next_child(&dev)) {
 711                         struct usb_port_status status;
 712
 713                         if (!device_active(dev))
 714                                 continue;
 715
 716                         udev = dev_get_parent_priv(dev);
 717                         if (usb_get_port_status(udev, udev->portnr, &status)
 718                                         < 0)
 719                                 /* USB request failed */
 720                                 continue;
 721
 722                         if (le16_to_cpu(status.wPortChange) &
 723                             USB_PORT_STAT_C_CONNECTION)
 724                                 change++;
 725                 }
 726         }
 727
 728         return change;
 729 }
 730
 731 static int usb_child_post_bind(struct udevice *dev)
 732 {
 733         struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 734         int val;
 735
 736         if (!dev_of_valid(dev))
 737                 return 0;
 738
 739         /* We only support matching a few things */
 740         val = dev_read_u32_default(dev, "usb,device-class", -1);
 741         if (val != -1) {
 742                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_DEV_CLASS;
 743                 plat->id.bDeviceClass = val;
 744         }
 745         val = dev_read_u32_default(dev, "usb,interface-class", -1);
 746         if (val != -1) {
 747                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_INT_CLASS;
 748                 plat->id.bInterfaceClass = val;
 749         }
 750
 751         return 0;
 752 }
 753
 754 struct udevice *usb_get_bus(struct udevice *dev)
 755 {
 756         struct udevice *bus;
 757
 758         for (bus = dev; bus && device_get_uclass_id(bus) != UCLASS_USB; )
 759                 bus = bus->parent;
 760         if (!bus) {
 761                 /* By design this cannot happen */
 762                 assert(bus);
 763                 debug("USB HUB '%s' does not have a controller\n", dev->name);
 764         }
 765
 766         return bus;
 767 }
 768
 769 int usb_child_pre_probe(struct udevice *dev)
 770 {
 771         struct usb_device *udev = dev_get_parent_priv(dev);
 772         struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 773         int ret;
 774
 775         if (plat->udev) {
 776                 /*
 777                  * Copy over all the values set in the on stack struct
 778                  * usb_device in usb_scan_device() to our final struct
 779                  * usb_device for this dev.
 780                  */
 781                 *udev = *(plat->udev);
 782                 /* And clear plat->udev as it will not be valid for long */
 783                 plat->udev = NULL;
 784                 udev->dev = dev;
 785         } else {
 786                 /*
 787                  * This happens with devices which are explicitly bound
 788                  * instead of being discovered through usb_scan_device()
 789                  * such as sandbox emul devices.
 790                  */
 791                 udev->dev = dev;
 792                 udev->controller_dev = usb_get_bus(dev);
 793                 udev->devnum = plat->devnum;
 794
 795                 /*
 796                  * udev did not go through usb_scan_device(), so we need to
 797                  * select the config and read the config descriptors.
 798                  */
 799                 ret = usb_select_config(udev);
 800                 if (ret)
 801                         return ret;
 802         }
 803
 804         return 0;
 805 }
 806
 807 UCLASS_DRIVER(usb) = {
 808         .id             = UCLASS_USB,
 809         .name           = "usb",
 810         .flags          = DM_UC_FLAG_SEQ_ALIAS,
 811         .post_bind      = dm_scan_fdt_dev,
 812         .priv_auto_alloc_size = sizeof(struct usb_uclass_priv),
 813         .per_child_auto_alloc_size = sizeof(struct usb_device),
 814         .per_device_auto_alloc_size = sizeof(struct usb_bus_priv),
 815         .child_post_bind = usb_child_post_bind,
 816         .child_pre_probe = usb_child_pre_probe,
 817         .per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
 818 };
 819
 820 UCLASS_DRIVER(usb_dev_generic) = {
 821         .id             = UCLASS_USB_DEV_GENERIC,
 822         .name           = "usb_dev_generic",
 823 };
 824
 825 U_BOOT_DRIVER(usb_dev_generic_drv) = {
 826         .id             = UCLASS_USB_DEV_GENERIC,
 827         .name           = "usb_dev_generic_drv",
 828 };