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