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
 197 #ifdef CONFIG_SANDBOX
 198         struct udevice *dev;
 199
 200         /* Reset all enulation devices */
 201         ret = uclass_get(UCLASS_USB_EMUL, &uc);
 202         if (ret)
 203                 return ret;
 204
 205         uclass_foreach_dev(dev, uc)
 206                 usb_emul_reset(dev);
 207 #endif
 208 #ifdef CONFIG_USB_STORAGE
 209         usb_stor_reset();
 210 #endif
 211         uc_priv->companion_device_count = 0;
 212         usb_started = 0;
 213
 214         return err;
 215 }
 216
 217 static void usb_scan_bus(struct udevice *bus, bool recurse)
 218 {
 219         struct usb_bus_priv *priv;
 220         struct udevice *dev;
 221         int ret;
 222
 223         priv = dev_get_uclass_priv(bus);
 224
 225         assert(recurse);        /* TODO: Support non-recusive */
 226
 227         printf("scanning bus %d for devices... ", bus->seq);
 228         debug("\n");
 229         ret = usb_scan_device(bus, 0, USB_SPEED_FULL, &dev);
 230         if (ret)
 231                 printf("failed, error %d\n", ret);
 232         else if (priv->next_addr == 0)
 233                 printf("No USB Device found\n");
 234         else
 235                 printf("%d USB Device(s) found\n", priv->next_addr);
 236 }
 237
 238 static void remove_inactive_children(struct uclass *uc, struct udevice *bus)
 239 {
 240         uclass_foreach_dev(bus, uc) {
 241                 struct udevice *dev, *next;
 242
 243                 if (!device_active(bus))
 244                         continue;
 245                 device_foreach_child_safe(dev, next, bus) {
 246                         if (!device_active(dev))
 247                                 device_unbind(dev);
 248                 }
 249         }
 250 }
 251
 252 int usb_init(void)
 253 {
 254         int controllers_initialized = 0;
 255         struct usb_uclass_priv *uc_priv;
 256         struct usb_bus_priv *priv;
 257         struct udevice *bus;
 258         struct uclass *uc;
 259         int count = 0;
 260         int ret;
 261
 262         asynch_allowed = 1;
 263
 264         ret = uclass_get(UCLASS_USB, &uc);
 265         if (ret)
 266                 return ret;
 267
 268         uc_priv = uc->priv;
 269
 270         uclass_foreach_dev(bus, uc) {
 271                 /* init low_level USB */
 272                 printf("USB%d:   ", count);
 273                 count++;
 274
 275 #ifdef CONFIG_SANDBOX
 276                 /*
 277                  * For Sandbox, we need scan the device tree each time when we
 278                  * start the USB stack, in order to re-create the emulated USB
 279                  * devices and bind drivers for them before we actually do the
 280                  * driver probe.
 281                  */
 282                 ret = dm_scan_fdt_dev(bus);
 283                 if (ret) {
 284                         printf("Sandbox USB device scan failed (%d)\n", ret);
 285                         continue;
 286                 }
 287 #endif
 288
 289                 ret = device_probe(bus);
 290                 if (ret == -ENODEV) {   /* No such device. */
 291                         puts("Port not available.\n");
 292                         controllers_initialized++;
 293                         continue;
 294                 }
 295
 296                 if (ret) {              /* Other error. */
 297                         printf("probe failed, error %d\n", ret);
 298                         continue;
 299                 }
 300                 controllers_initialized++;
 301                 usb_started = true;
 302         }
 303
 304         /*
 305          * lowlevel init done, now scan the bus for devices i.e. search HUBs
 306          * and configure them, first scan primary controllers.
 307          */
 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          * Now that the primary controllers have been scanned and have handed
 319          * over any devices they do not understand to their companions, scan
 320          * the companions if necessary.
 321          */
 322         if (uc_priv->companion_device_count) {
 323                 uclass_foreach_dev(bus, uc) {
 324                         if (!device_active(bus))
 325                                 continue;
 326
 327                         priv = dev_get_uclass_priv(bus);
 328                         if (priv->companion)
 329                                 usb_scan_bus(bus, true);
 330                 }
 331         }
 332
 333         debug("scan end\n");
 334
 335         /* Remove any devices that were not found on this scan */
 336         remove_inactive_children(uc, bus);
 337
 338         ret = uclass_get(UCLASS_USB_HUB, &uc);
 339         if (ret)
 340                 return ret;
 341         remove_inactive_children(uc, bus);
 342
 343         /* if we were not able to find at least one working bus, bail out */
 344         if (!count)
 345                 printf("No controllers found\n");
 346         else if (controllers_initialized == 0)
 347                 printf("USB error: all controllers failed lowlevel init\n");
 348
 349         return usb_started ? 0 : -1;
 350 }
 351
 352 /*
 353  * TODO(sjg@chromium.org): Remove this legacy function. At present it is needed
 354  * to support boards which use driver model for USB but not Ethernet, and want
 355  * to use USB Ethernet.
 356  *
 357  * The #if clause is here to ensure that remains the only case.
 358  */
 359 #if !defined(CONFIG_DM_ETH) && defined(CONFIG_USB_HOST_ETHER)
 360 static struct usb_device *find_child_devnum(struct udevice *parent, int devnum)
 361 {
 362         struct usb_device *udev;
 363         struct udevice *dev;
 364
 365         if (!device_active(parent))
 366                 return NULL;
 367         udev = dev_get_parent_priv(parent);
 368         if (udev->devnum == devnum)
 369                 return udev;
 370
 371         for (device_find_first_child(parent, &dev);
 372              dev;
 373              device_find_next_child(&dev)) {
 374                 udev = find_child_devnum(dev, devnum);
 375                 if (udev)
 376                         return udev;
 377         }
 378
 379         return NULL;
 380 }
 381
 382 struct usb_device *usb_get_dev_index(struct udevice *bus, int index)
 383 {
 384         struct udevice *dev;
 385         int devnum = index + 1; /* Addresses are allocated from 1 on USB */
 386
 387         device_find_first_child(bus, &dev);
 388         if (!dev)
 389                 return NULL;
 390
 391         return find_child_devnum(dev, devnum);
 392 }
 393 #endif
 394
 395 int usb_setup_ehci_gadget(struct ehci_ctrl **ctlrp)
 396 {
 397         struct usb_platdata *plat;
 398         struct udevice *dev;
 399         int ret;
 400
 401         /* Find the old device and remove it */
 402         ret = uclass_find_device_by_seq(UCLASS_USB, 0, true, &dev);
 403         if (ret)
 404                 return ret;
 405         ret = device_remove(dev, DM_REMOVE_NORMAL);
 406         if (ret)
 407                 return ret;
 408
 409         plat = dev_get_platdata(dev);
 410         plat->init_type = USB_INIT_DEVICE;
 411         ret = device_probe(dev);
 412         if (ret)
 413                 return ret;
 414         *ctlrp = dev_get_priv(dev);
 415
 416         return 0;
 417 }
 418
 419 /* returns 0 if no match, 1 if match */
 420 static int usb_match_device(const struct usb_device_descriptor *desc,
 421                             const struct usb_device_id *id)
 422 {
 423         if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
 424             id->idVendor != le16_to_cpu(desc->idVendor))
 425                 return 0;
 426
 427         if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
 428             id->idProduct != le16_to_cpu(desc->idProduct))
 429                 return 0;
 430
 431         /* No need to test id->bcdDevice_lo != 0, since 0 is never
 432            greater than any unsigned number. */
 433         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
 434             (id->bcdDevice_lo > le16_to_cpu(desc->bcdDevice)))
 435                 return 0;
 436
 437         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
 438             (id->bcdDevice_hi < le16_to_cpu(desc->bcdDevice)))
 439                 return 0;
 440
 441         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
 442             (id->bDeviceClass != desc->bDeviceClass))
 443                 return 0;
 444
 445         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
 446             (id->bDeviceSubClass != desc->bDeviceSubClass))
 447                 return 0;
 448
 449         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
 450             (id->bDeviceProtocol != desc->bDeviceProtocol))
 451                 return 0;
 452
 453         return 1;
 454 }
 455
 456 /* returns 0 if no match, 1 if match */
 457 static int usb_match_one_id_intf(const struct usb_device_descriptor *desc,
 458                         const struct usb_interface_descriptor *int_desc,
 459                         const struct usb_device_id *id)
 460 {
 461         /* The interface class, subclass, protocol and number should never be
 462          * checked for a match if the device class is Vendor Specific,
 463          * unless the match record specifies the Vendor ID. */
 464         if (desc->bDeviceClass == USB_CLASS_VENDOR_SPEC &&
 465             !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
 466             (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS |
 467                                 USB_DEVICE_ID_MATCH_INT_SUBCLASS |
 468                                 USB_DEVICE_ID_MATCH_INT_PROTOCOL |
 469                                 USB_DEVICE_ID_MATCH_INT_NUMBER)))
 470                 return 0;
 471
 472         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
 473             (id->bInterfaceClass != int_desc->bInterfaceClass))
 474                 return 0;
 475
 476         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) &&
 477             (id->bInterfaceSubClass != int_desc->bInterfaceSubClass))
 478                 return 0;
 479
 480         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) &&
 481             (id->bInterfaceProtocol != int_desc->bInterfaceProtocol))
 482                 return 0;
 483
 484         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_NUMBER) &&
 485             (id->bInterfaceNumber != int_desc->bInterfaceNumber))
 486                 return 0;
 487
 488         return 1;
 489 }
 490
 491 /* returns 0 if no match, 1 if match */
 492 static int usb_match_one_id(struct usb_device_descriptor *desc,
 493                             struct usb_interface_descriptor *int_desc,
 494                             const struct usb_device_id *id)
 495 {
 496         if (!usb_match_device(desc, id))
 497                 return 0;
 498
 499         return usb_match_one_id_intf(desc, int_desc, id);
 500 }
 501
 502 /**
 503  * usb_find_and_bind_driver() - Find and bind the right USB driver
 504  *
 505  * This only looks at certain fields in the descriptor.
 506  */
 507 static int usb_find_and_bind_driver(struct udevice *parent,
 508                                     struct usb_device_descriptor *desc,
 509                                     struct usb_interface_descriptor *iface,
 510                                     int bus_seq, int devnum,
 511                                     struct udevice **devp)
 512 {
 513         struct usb_driver_entry *start, *entry;
 514         int n_ents;
 515         int ret;
 516         char name[30], *str;
 517
 518         *devp = NULL;
 519         debug("%s: Searching for driver\n", __func__);
 520         start = ll_entry_start(struct usb_driver_entry, usb_driver_entry);
 521         n_ents = ll_entry_count(struct usb_driver_entry, usb_driver_entry);
 522         for (entry = start; entry != start + n_ents; entry++) {
 523                 const struct usb_device_id *id;
 524                 struct udevice *dev;
 525                 const struct driver *drv;
 526                 struct usb_dev_platdata *plat;
 527
 528                 for (id = entry->match; id->match_flags; id++) {
 529                         if (!usb_match_one_id(desc, iface, id))
 530                                 continue;
 531
 532                         drv = entry->driver;
 533                         /*
 534                          * We could pass the descriptor to the driver as
 535                          * platdata (instead of NULL) and allow its bind()
 536                          * method to return -ENOENT if it doesn't support this
 537                          * device. That way we could continue the search to
 538                          * find another driver. For now this doesn't seem
 539                          * necesssary, so just bind the first match.
 540                          */
 541                         ret = device_bind(parent, drv, drv->name, NULL, -1,
 542                                           &dev);
 543                         if (ret)
 544                                 goto error;
 545                         debug("%s: Match found: %s\n", __func__, drv->name);
 546                         dev->driver_data = id->driver_info;
 547                         plat = dev_get_parent_platdata(dev);
 548                         plat->id = *id;
 549                         *devp = dev;
 550                         return 0;
 551                 }
 552         }
 553
 554         /* Bind a generic driver so that the device can be used */
 555         snprintf(name, sizeof(name), "generic_bus_%x_dev_%x", bus_seq, devnum);
 556         str = strdup(name);
 557         if (!str)
 558                 return -ENOMEM;
 559         ret = device_bind_driver(parent, "usb_dev_generic_drv", str, devp);
 560
 561 error:
 562         debug("%s: No match found: %d\n", __func__, ret);
 563         return ret;
 564 }
 565
 566 /**
 567  * usb_find_child() - Find an existing device which matches our needs
 568  *
 569  *
 570  */
 571 static int usb_find_child(struct udevice *parent,
 572                           struct usb_device_descriptor *desc,
 573                           struct usb_interface_descriptor *iface,
 574                           struct udevice **devp)
 575 {
 576         struct udevice *dev;
 577
 578         *devp = NULL;
 579         for (device_find_first_child(parent, &dev);
 580              dev;
 581              device_find_next_child(&dev)) {
 582                 struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 583
 584                 /* If this device is already in use, skip it */
 585                 if (device_active(dev))
 586                         continue;
 587                 debug("   %s: name='%s', plat=%d, desc=%d\n", __func__,
 588                       dev->name, plat->id.bDeviceClass, desc->bDeviceClass);
 589                 if (usb_match_one_id(desc, iface, &plat->id)) {
 590                         *devp = dev;
 591                         return 0;
 592                 }
 593         }
 594
 595         return -ENOENT;
 596 }
 597
 598 int usb_scan_device(struct udevice *parent, int port,
 599                     enum usb_device_speed speed, struct udevice **devp)
 600 {
 601         struct udevice *dev;
 602         bool created = false;
 603         struct usb_dev_platdata *plat;
 604         struct usb_bus_priv *priv;
 605         struct usb_device *parent_udev;
 606         int ret;
 607         ALLOC_CACHE_ALIGN_BUFFER(struct usb_device, udev, 1);
 608         struct usb_interface_descriptor *iface = &udev->config.if_desc[0].desc;
 609
 610         *devp = NULL;
 611         memset(udev, '\0', sizeof(*udev));
 612         udev->controller_dev = usb_get_bus(parent);
 613         priv = dev_get_uclass_priv(udev->controller_dev);
 614
 615         /*
 616          * Somewhat nasty, this. We create a local device and use the normal
 617          * USB stack to read its descriptor. Then we know what type of device
 618          * to create for real.
 619          *
 620          * udev->dev is set to the parent, since we don't have a real device
 621          * yet. The USB stack should not access udev.dev anyway, except perhaps
 622          * to find the controller, and the controller will either be @parent,
 623          * or some parent of @parent.
 624          *
 625          * Another option might be to create the device as a generic USB
 626          * device, then morph it into the correct one when we know what it
 627          * should be. This means that a generic USB device would morph into
 628          * a network controller, or a USB flash stick, for example. However,
 629          * we don't support such morphing and it isn't clear that it would
 630          * be easy to do.
 631          *
 632          * Yet another option is to split out the USB stack parts of udev
 633          * into something like a 'struct urb' (as Linux does) which can exist
 634          * independently of any device. This feels cleaner, but calls for quite
 635          * a big change to the USB stack.
 636          *
 637          * For now, the approach is to set up an empty udev, read its
 638          * descriptor and assign it an address, then bind a real device and
 639          * stash the resulting information into the device's parent
 640          * platform data. Then when we probe it, usb_child_pre_probe() is called
 641          * and it will pull the information out of the stash.
 642          */
 643         udev->dev = parent;
 644         udev->speed = speed;
 645         udev->devnum = priv->next_addr + 1;
 646         udev->portnr = port;
 647         debug("Calling usb_setup_device(), portnr=%d\n", udev->portnr);
 648         parent_udev = device_get_uclass_id(parent) == UCLASS_USB_HUB ?
 649                 dev_get_parent_priv(parent) : NULL;
 650         ret = usb_setup_device(udev, priv->desc_before_addr, parent_udev);
 651         debug("read_descriptor for '%s': ret=%d\n", parent->name, ret);
 652         if (ret)
 653                 return ret;
 654         ret = usb_find_child(parent, &udev->descriptor, iface, &dev);
 655         debug("** usb_find_child returns %d\n", ret);
 656         if (ret) {
 657                 if (ret != -ENOENT)
 658                         return ret;
 659                 ret = usb_find_and_bind_driver(parent, &udev->descriptor, iface,
 660                                                udev->controller_dev->seq,
 661                                                udev->devnum, &dev);
 662                 if (ret)
 663                         return ret;
 664                 created = true;
 665         }
 666         plat = dev_get_parent_platdata(dev);
 667         debug("%s: Probing '%s', plat=%p\n", __func__, dev->name, plat);
 668         plat->devnum = udev->devnum;
 669         plat->udev = udev;
 670         priv->next_addr++;
 671         ret = device_probe(dev);
 672         if (ret) {
 673                 debug("%s: Device '%s' probe failed\n", __func__, dev->name);
 674                 priv->next_addr--;
 675                 if (created)
 676                         device_unbind(dev);
 677                 return ret;
 678         }
 679         *devp = dev;
 680
 681         return 0;
 682 }
 683
 684 /*
 685  * Detect if a USB device has been plugged or unplugged.
 686  */
 687 int usb_detect_change(void)
 688 {
 689         struct udevice *hub;
 690         struct uclass *uc;
 691         int change = 0;
 692         int ret;
 693
 694         ret = uclass_get(UCLASS_USB_HUB, &uc);
 695         if (ret)
 696                 return ret;
 697
 698         uclass_foreach_dev(hub, uc) {
 699                 struct usb_device *udev;
 700                 struct udevice *dev;
 701
 702                 if (!device_active(hub))
 703                         continue;
 704                 for (device_find_first_child(hub, &dev);
 705                      dev;
 706                      device_find_next_child(&dev)) {
 707                         struct usb_port_status status;
 708
 709                         if (!device_active(dev))
 710                                 continue;
 711
 712                         udev = dev_get_parent_priv(dev);
 713                         if (usb_get_port_status(udev, udev->portnr, &status)
 714                                         < 0)
 715                                 /* USB request failed */
 716                                 continue;
 717
 718                         if (le16_to_cpu(status.wPortChange) &
 719                             USB_PORT_STAT_C_CONNECTION)
 720                                 change++;
 721                 }
 722         }
 723
 724         return change;
 725 }
 726
 727 static int usb_child_post_bind(struct udevice *dev)
 728 {
 729         struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 730         int val;
 731
 732         if (!dev_of_valid(dev))
 733                 return 0;
 734
 735         /* We only support matching a few things */
 736         val = dev_read_u32_default(dev, "usb,device-class", -1);
 737         if (val != -1) {
 738                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_DEV_CLASS;
 739                 plat->id.bDeviceClass = val;
 740         }
 741         val = dev_read_u32_default(dev, "usb,interface-class", -1);
 742         if (val != -1) {
 743                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_INT_CLASS;
 744                 plat->id.bInterfaceClass = val;
 745         }
 746
 747         return 0;
 748 }
 749
 750 struct udevice *usb_get_bus(struct udevice *dev)
 751 {
 752         struct udevice *bus;
 753
 754         for (bus = dev; bus && device_get_uclass_id(bus) != UCLASS_USB; )
 755                 bus = bus->parent;
 756         if (!bus) {
 757                 /* By design this cannot happen */
 758                 assert(bus);
 759                 debug("USB HUB '%s' does not have a controller\n", dev->name);
 760         }
 761
 762         return bus;
 763 }
 764
 765 int usb_child_pre_probe(struct udevice *dev)
 766 {
 767         struct usb_device *udev = dev_get_parent_priv(dev);
 768         struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 769         int ret;
 770
 771         if (plat->udev) {
 772                 /*
 773                  * Copy over all the values set in the on stack struct
 774                  * usb_device in usb_scan_device() to our final struct
 775                  * usb_device for this dev.
 776                  */
 777                 *udev = *(plat->udev);
 778                 /* And clear plat->udev as it will not be valid for long */
 779                 plat->udev = NULL;
 780                 udev->dev = dev;
 781         } else {
 782                 /*
 783                  * This happens with devices which are explicitly bound
 784                  * instead of being discovered through usb_scan_device()
 785                  * such as sandbox emul devices.
 786                  */
 787                 udev->dev = dev;
 788                 udev->controller_dev = usb_get_bus(dev);
 789                 udev->devnum = plat->devnum;
 790
 791                 /*
 792                  * udev did not go through usb_scan_device(), so we need to
 793                  * select the config and read the config descriptors.
 794                  */
 795                 ret = usb_select_config(udev);
 796                 if (ret)
 797                         return ret;
 798         }
 799
 800         return 0;
 801 }
 802
 803 UCLASS_DRIVER(usb) = {
 804         .id             = UCLASS_USB,
 805         .name           = "usb",
 806         .flags          = DM_UC_FLAG_SEQ_ALIAS,
 807         .post_bind      = dm_scan_fdt_dev,
 808         .priv_auto_alloc_size = sizeof(struct usb_uclass_priv),
 809         .per_child_auto_alloc_size = sizeof(struct usb_device),
 810         .per_device_auto_alloc_size = sizeof(struct usb_bus_priv),
 811         .child_post_bind = usb_child_post_bind,
 812         .child_pre_probe = usb_child_pre_probe,
 813         .per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
 814 };
 815
 816 UCLASS_DRIVER(usb_dev_generic) = {
 817         .id             = UCLASS_USB_DEV_GENERIC,
 818         .name           = "usb_dev_generic",
 819 };
 820
 821 U_BOOT_DRIVER(usb_dev_generic_drv) = {
 822         .id             = UCLASS_USB_DEV_GENERIC,
 823         .name           = "usb_dev_generic_drv",
 824 };