drivers/usb/host/usb-uclass.c

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