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 #define LOG_CATEGORY UCLASS_USB
  10
  11 #include <common.h>
  12 #include <dm.h>
  13 #include <errno.h>
  14 #include <log.h>
  15 #include <memalign.h>
  16 #include <usb.h>
  17 #include <dm/device-internal.h>
  18 #include <dm/lists.h>
  19 #include <dm/uclass-internal.h>
  20
  21 static bool asynch_allowed;
  22
  23 struct usb_uclass_priv {
  24         int companion_device_count;
  25 };
  26
  27 int usb_lock_async(struct usb_device *udev, int lock)
  28 {
  29         struct udevice *bus = udev->controller_dev;
  30         struct dm_usb_ops *ops = usb_get_ops(bus);
  31
  32         if (!ops->lock_async)
  33                 return -ENOSYS;
  34
  35         return ops->lock_async(bus, lock);
  36 }
  37
  38 int usb_disable_asynch(int disable)
  39 {
  40         int old_value = asynch_allowed;
  41
  42         asynch_allowed = !disable;
  43         return old_value;
  44 }
  45
  46 int submit_int_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
  47                    int length, int interval, bool nonblock)
  48 {
  49         struct udevice *bus = udev->controller_dev;
  50         struct dm_usb_ops *ops = usb_get_ops(bus);
  51
  52         if (!ops->interrupt)
  53                 return -ENOSYS;
  54
  55         return ops->interrupt(bus, udev, pipe, buffer, length, interval,
  56                               nonblock);
  57 }
  58
  59 int submit_control_msg(struct usb_device *udev, unsigned long pipe,
  60                        void *buffer, int length, struct devrequest *setup)
  61 {
  62         struct udevice *bus = udev->controller_dev;
  63         struct dm_usb_ops *ops = usb_get_ops(bus);
  64         struct usb_uclass_priv *uc_priv = uclass_get_priv(bus->uclass);
  65         int err;
  66
  67         if (!ops->control)
  68                 return -ENOSYS;
  69
  70         err = ops->control(bus, udev, pipe, buffer, length, setup);
  71         if (setup->request == USB_REQ_SET_FEATURE &&
  72             setup->requesttype == USB_RT_PORT &&
  73             setup->value == cpu_to_le16(USB_PORT_FEAT_RESET) &&
  74             err == -ENXIO) {
  75                 /* Device handed over to companion after port reset */
  76                 uc_priv->companion_device_count++;
  77         }
  78
  79         return err;
  80 }
  81
  82 int submit_bulk_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
  83                     int length)
  84 {
  85         struct udevice *bus = udev->controller_dev;
  86         struct dm_usb_ops *ops = usb_get_ops(bus);
  87
  88         if (!ops->bulk)
  89                 return -ENOSYS;
  90
  91         return ops->bulk(bus, udev, pipe, buffer, length);
  92 }
  93
  94 struct int_queue *create_int_queue(struct usb_device *udev,
  95                 unsigned long pipe, int queuesize, int elementsize,
  96                 void *buffer, int interval)
  97 {
  98         struct udevice *bus = udev->controller_dev;
  99         struct dm_usb_ops *ops = usb_get_ops(bus);
 100
 101         if (!ops->create_int_queue)
 102                 return NULL;
 103
 104         return ops->create_int_queue(bus, udev, pipe, queuesize, elementsize,
 105                                      buffer, interval);
 106 }
 107
 108 void *poll_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->poll_int_queue)
 114                 return NULL;
 115
 116         return ops->poll_int_queue(bus, udev, queue);
 117 }
 118
 119 int destroy_int_queue(struct usb_device *udev, struct int_queue *queue)
 120 {
 121         struct udevice *bus = udev->controller_dev;
 122         struct dm_usb_ops *ops = usb_get_ops(bus);
 123
 124         if (!ops->destroy_int_queue)
 125                 return -ENOSYS;
 126
 127         return ops->destroy_int_queue(bus, udev, queue);
 128 }
 129
 130 int usb_alloc_device(struct usb_device *udev)
 131 {
 132         struct udevice *bus = udev->controller_dev;
 133         struct dm_usb_ops *ops = usb_get_ops(bus);
 134
 135         /* This is only requird by some controllers - current XHCI */
 136         if (!ops->alloc_device)
 137                 return 0;
 138
 139         return ops->alloc_device(bus, udev);
 140 }
 141
 142 int usb_reset_root_port(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->reset_root_port)
 148                 return -ENOSYS;
 149
 150         return ops->reset_root_port(bus, udev);
 151 }
 152
 153 int usb_update_hub_device(struct usb_device *udev)
 154 {
 155         struct udevice *bus = udev->controller_dev;
 156         struct dm_usb_ops *ops = usb_get_ops(bus);
 157
 158         if (!ops->update_hub_device)
 159                 return -ENOSYS;
 160
 161         return ops->update_hub_device(bus, udev);
 162 }
 163
 164 int usb_get_max_xfer_size(struct usb_device *udev, size_t *size)
 165 {
 166         struct udevice *bus = udev->controller_dev;
 167         struct dm_usb_ops *ops = usb_get_ops(bus);
 168
 169         if (!ops->get_max_xfer_size)
 170                 return -ENOSYS;
 171
 172         return ops->get_max_xfer_size(bus, size);
 173 }
 174
 175 int usb_stop(void)
 176 {
 177         struct udevice *bus;
 178         struct udevice *rh;
 179         struct uclass *uc;
 180         struct usb_uclass_priv *uc_priv;
 181         int err = 0, ret;
 182
 183         /* De-activate any devices that have been activated */
 184         ret = uclass_get(UCLASS_USB, &uc);
 185         if (ret)
 186                 return ret;
 187
 188         uc_priv = uclass_get_priv(uc);
 189
 190         uclass_foreach_dev(bus, uc) {
 191                 ret = device_remove(bus, DM_REMOVE_NORMAL);
 192                 if (ret && !err)
 193                         err = ret;
 194
 195                 /* Locate root hub device */
 196                 device_find_first_child(bus, &rh);
 197                 if (rh) {
 198                         /*
 199                          * All USB devices are children of root hub.
 200                          * Unbinding root hub will unbind all of its children.
 201                          */
 202                         ret = device_unbind(rh);
 203                         if (ret && !err)
 204                                 err = ret;
 205                 }
 206         }
 207
 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 %s for devices... ", bus->name);
 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 ret;
 260
 261         asynch_allowed = 1;
 262
 263         ret = uclass_get(UCLASS_USB, &uc);
 264         if (ret)
 265                 return ret;
 266
 267         uc_priv = uclass_get_priv(uc);
 268
 269         uclass_foreach_dev(bus, uc) {
 270                 /* init low_level USB */
 271                 printf("Bus %s: ", bus->name);
 272
 273                 /*
 274                  * For Sandbox, we need scan the device tree each time when we
 275                  * start the USB stack, in order to re-create the emulated USB
 276                  * devices and bind drivers for them before we actually do the
 277                  * driver probe.
 278                  *
 279                  * For USB onboard HUB, we need to do some non-trivial init
 280                  * like enabling a power regulator, before enumeration.
 281                  */
 282                 if (IS_ENABLED(CONFIG_SANDBOX) ||
 283                     IS_ENABLED(CONFIG_USB_ONBOARD_HUB)) {
 284                         ret = dm_scan_fdt_dev(bus);
 285                         if (ret) {
 286                                 printf("USB device scan from fdt failed (%d)", ret);
 287                                 continue;
 288                         }
 289                 }
 290
 291                 ret = device_probe(bus);
 292                 if (ret == -ENODEV) {   /* No such device. */
 293                         puts("Port not available.\n");
 294                         controllers_initialized++;
 295                         continue;
 296                 }
 297
 298                 if (ret) {              /* Other error. */
 299                         printf("probe failed, error %d\n", ret);
 300                         continue;
 301                 }
 302                 controllers_initialized++;
 303                 usb_started = true;
 304         }
 305
 306         /*
 307          * lowlevel init done, now scan the bus for devices i.e. search HUBs
 308          * and configure them, first scan primary controllers.
 309          */
 310         uclass_foreach_dev(bus, uc) {
 311                 if (!device_active(bus))
 312                         continue;
 313
 314                 priv = dev_get_uclass_priv(bus);
 315                 if (!priv->companion)
 316                         usb_scan_bus(bus, true);
 317         }
 318
 319         /*
 320          * Now that the primary controllers have been scanned and have handed
 321          * over any devices they do not understand to their companions, scan
 322          * the companions if necessary.
 323          */
 324         if (uc_priv->companion_device_count) {
 325                 uclass_foreach_dev(bus, uc) {
 326                         if (!device_active(bus))
 327                                 continue;
 328
 329                         priv = dev_get_uclass_priv(bus);
 330                         if (priv->companion)
 331                                 usb_scan_bus(bus, true);
 332                 }
 333         }
 334
 335         debug("scan end\n");
 336
 337         /* Remove any devices that were not found on this scan */
 338         remove_inactive_children(uc, bus);
 339
 340         ret = uclass_get(UCLASS_USB_HUB, &uc);
 341         if (ret)
 342                 return ret;
 343         remove_inactive_children(uc, bus);
 344
 345         /* if we were not able to find at least one working bus, bail out */
 346         if (controllers_initialized == 0)
 347                 printf("No working controllers found\n");
 348
 349         return usb_started ? 0 : -ENOENT;
 350 }
 351
 352 int usb_setup_ehci_gadget(struct ehci_ctrl **ctlrp)
 353 {
 354         struct usb_plat *plat;
 355         struct udevice *dev;
 356         int ret;
 357
 358         /* Find the old device and remove it */
 359         ret = uclass_find_first_device(UCLASS_USB, &dev);
 360         if (ret)
 361                 return ret;
 362         ret = device_remove(dev, DM_REMOVE_NORMAL);
 363         if (ret)
 364                 return ret;
 365
 366         plat = dev_get_plat(dev);
 367         plat->init_type = USB_INIT_DEVICE;
 368         ret = device_probe(dev);
 369         if (ret)
 370                 return ret;
 371         *ctlrp = dev_get_priv(dev);
 372
 373         return 0;
 374 }
 375
 376 int usb_remove_ehci_gadget(struct ehci_ctrl **ctlrp)
 377 {
 378         struct udevice *dev;
 379         int ret;
 380
 381         /* Find the old device and remove it */
 382         ret = uclass_find_first_device(UCLASS_USB, &dev);
 383         if (ret)
 384                 return ret;
 385         ret = device_remove(dev, DM_REMOVE_NORMAL);
 386         if (ret)
 387                 return ret;
 388
 389         *ctlrp = NULL;
 390
 391         return 0;
 392 }
 393
 394 /* returns 0 if no match, 1 if match */
 395 static int usb_match_device(const struct usb_device_descriptor *desc,
 396                             const struct usb_device_id *id)
 397 {
 398         if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
 399             id->idVendor != desc->idVendor)
 400                 return 0;
 401
 402         if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
 403             id->idProduct != desc->idProduct)
 404                 return 0;
 405
 406         /* No need to test id->bcdDevice_lo != 0, since 0 is never
 407            greater than any unsigned number. */
 408         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
 409             (id->bcdDevice_lo > desc->bcdDevice))
 410                 return 0;
 411
 412         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
 413             (id->bcdDevice_hi < desc->bcdDevice))
 414                 return 0;
 415
 416         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
 417             (id->bDeviceClass != desc->bDeviceClass))
 418                 return 0;
 419
 420         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
 421             (id->bDeviceSubClass != desc->bDeviceSubClass))
 422                 return 0;
 423
 424         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
 425             (id->bDeviceProtocol != desc->bDeviceProtocol))
 426                 return 0;
 427
 428         return 1;
 429 }
 430
 431 /* returns 0 if no match, 1 if match */
 432 static int usb_match_one_id_intf(const struct usb_device_descriptor *desc,
 433                         const struct usb_interface_descriptor *int_desc,
 434                         const struct usb_device_id *id)
 435 {
 436         /* The interface class, subclass, protocol and number should never be
 437          * checked for a match if the device class is Vendor Specific,
 438          * unless the match record specifies the Vendor ID. */
 439         if (desc->bDeviceClass == USB_CLASS_VENDOR_SPEC &&
 440             !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
 441             (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS |
 442                                 USB_DEVICE_ID_MATCH_INT_SUBCLASS |
 443                                 USB_DEVICE_ID_MATCH_INT_PROTOCOL |
 444                                 USB_DEVICE_ID_MATCH_INT_NUMBER)))
 445                 return 0;
 446
 447         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
 448             (id->bInterfaceClass != int_desc->bInterfaceClass))
 449                 return 0;
 450
 451         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) &&
 452             (id->bInterfaceSubClass != int_desc->bInterfaceSubClass))
 453                 return 0;
 454
 455         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) &&
 456             (id->bInterfaceProtocol != int_desc->bInterfaceProtocol))
 457                 return 0;
 458
 459         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_NUMBER) &&
 460             (id->bInterfaceNumber != int_desc->bInterfaceNumber))
 461                 return 0;
 462
 463         return 1;
 464 }
 465
 466 /* returns 0 if no match, 1 if match */
 467 static int usb_match_one_id(struct usb_device_descriptor *desc,
 468                             struct usb_interface_descriptor *int_desc,
 469                             const struct usb_device_id *id)
 470 {
 471         if (!usb_match_device(desc, id))
 472                 return 0;
 473
 474         return usb_match_one_id_intf(desc, int_desc, id);
 475 }
 476
 477 static ofnode usb_get_ofnode(struct udevice *hub, int port)
 478 {
 479         ofnode node;
 480         u32 reg;
 481
 482         if (!dev_has_ofnode(hub))
 483                 return ofnode_null();
 484
 485         /*
 486          * The USB controller and its USB hub are two different udevices,
 487          * but the device tree has only one node for both. Thus we are
 488          * assigning this node to both udevices.
 489          * If port is zero, the controller scans its root hub, thus we
 490          * are using the same ofnode as the controller here.
 491          */
 492         if (!port)
 493                 return dev_ofnode(hub);
 494
 495         ofnode_for_each_subnode(node, dev_ofnode(hub)) {
 496                 if (ofnode_read_u32(node, "reg", &reg))
 497                         continue;
 498
 499                 if (reg == port)
 500                         return node;
 501         }
 502
 503         return ofnode_null();
 504 }
 505
 506 /**
 507  * usb_find_and_bind_driver() - Find and bind the right USB driver
 508  *
 509  * This only looks at certain fields in the descriptor.
 510  */
 511 static int usb_find_and_bind_driver(struct udevice *parent,
 512                                     struct usb_device_descriptor *desc,
 513                                     struct usb_interface_descriptor *iface,
 514                                     int bus_seq, int devnum, int port,
 515                                     struct udevice **devp)
 516 {
 517         struct usb_driver_entry *start, *entry;
 518         int n_ents;
 519         int ret;
 520         char name[34], *str;
 521         ofnode node = usb_get_ofnode(parent, port);
 522
 523         *devp = NULL;
 524         debug("%s: Searching for driver\n", __func__);
 525         start = ll_entry_start(struct usb_driver_entry, usb_driver_entry);
 526         n_ents = ll_entry_count(struct usb_driver_entry, usb_driver_entry);
 527         for (entry = start; entry != start + n_ents; entry++) {
 528                 const struct usb_device_id *id;
 529                 struct udevice *dev;
 530                 const struct driver *drv;
 531                 struct usb_dev_plat *plat;
 532
 533                 for (id = entry->match; id->match_flags; id++) {
 534                         if (!usb_match_one_id(desc, iface, id))
 535                                 continue;
 536
 537                         drv = entry->driver;
 538                         /*
 539                          * We could pass the descriptor to the driver as
 540                          * plat (instead of NULL) and allow its bind()
 541                          * method to return -ENOENT if it doesn't support this
 542                          * device. That way we could continue the search to
 543                          * find another driver. For now this doesn't seem
 544                          * necesssary, so just bind the first match.
 545                          */
 546                         ret = device_bind(parent, drv, drv->name, NULL, node,
 547                                           &dev);
 548                         if (ret)
 549                                 goto error;
 550                         debug("%s: Match found: %s\n", __func__, drv->name);
 551                         dev->driver_data = id->driver_info;
 552                         plat = dev_get_parent_plat(dev);
 553                         plat->id = *id;
 554                         *devp = dev;
 555                         return 0;
 556                 }
 557         }
 558
 559         /* Bind a generic driver so that the device can be used */
 560         snprintf(name, sizeof(name), "generic_bus_%x_dev_%x", bus_seq, devnum);
 561         str = strdup(name);
 562         if (!str)
 563                 return -ENOMEM;
 564         ret = device_bind_driver(parent, "usb_dev_generic_drv", str, devp);
 565         if (!ret)
 566                 device_set_name_alloced(*devp);
 567
 568 error:
 569         debug("%s: No match found: %d\n", __func__, ret);
 570         return ret;
 571 }
 572
 573 /**
 574  * usb_find_child() - Find an existing device which matches our needs
 575  *
 576  *
 577  */
 578 static int usb_find_child(struct udevice *parent,
 579                           struct usb_device_descriptor *desc,
 580                           struct usb_interface_descriptor *iface,
 581                           struct udevice **devp)
 582 {
 583         struct udevice *dev;
 584
 585         *devp = NULL;
 586         for (device_find_first_child(parent, &dev);
 587              dev;
 588              device_find_next_child(&dev)) {
 589                 struct usb_dev_plat *plat = dev_get_parent_plat(dev);
 590
 591                 /* If this device is already in use, skip it */
 592                 if (device_active(dev))
 593                         continue;
 594                 debug("   %s: name='%s', plat=%d, desc=%d\n", __func__,
 595                       dev->name, plat->id.bDeviceClass, desc->bDeviceClass);
 596                 if (usb_match_one_id(desc, iface, &plat->id)) {
 597                         *devp = dev;
 598                         return 0;
 599                 }
 600         }
 601
 602         return -ENOENT;
 603 }
 604
 605 int usb_scan_device(struct udevice *parent, int port,
 606                     enum usb_device_speed speed, struct udevice **devp)
 607 {
 608         struct udevice *dev;
 609         bool created = false;
 610         struct usb_dev_plat *plat;
 611         struct usb_bus_priv *priv;
 612         struct usb_device *parent_udev;
 613         int ret;
 614         ALLOC_CACHE_ALIGN_BUFFER(struct usb_device, udev, 1);
 615         struct usb_interface_descriptor *iface = &udev->config.if_desc[0].desc;
 616
 617         *devp = NULL;
 618         memset(udev, '\0', sizeof(*udev));
 619         udev->controller_dev = usb_get_bus(parent);
 620         priv = dev_get_uclass_priv(udev->controller_dev);
 621
 622         /*
 623          * Somewhat nasty, this. We create a local device and use the normal
 624          * USB stack to read its descriptor. Then we know what type of device
 625          * to create for real.
 626          *
 627          * udev->dev is set to the parent, since we don't have a real device
 628          * yet. The USB stack should not access udev.dev anyway, except perhaps
 629          * to find the controller, and the controller will either be @parent,
 630          * or some parent of @parent.
 631          *
 632          * Another option might be to create the device as a generic USB
 633          * device, then morph it into the correct one when we know what it
 634          * should be. This means that a generic USB device would morph into
 635          * a network controller, or a USB flash stick, for example. However,
 636          * we don't support such morphing and it isn't clear that it would
 637          * be easy to do.
 638          *
 639          * Yet another option is to split out the USB stack parts of udev
 640          * into something like a 'struct urb' (as Linux does) which can exist
 641          * independently of any device. This feels cleaner, but calls for quite
 642          * a big change to the USB stack.
 643          *
 644          * For now, the approach is to set up an empty udev, read its
 645          * descriptor and assign it an address, then bind a real device and
 646          * stash the resulting information into the device's parent
 647          * platform data. Then when we probe it, usb_child_pre_probe() is called
 648          * and it will pull the information out of the stash.
 649          */
 650         udev->dev = parent;
 651         udev->speed = speed;
 652         udev->devnum = priv->next_addr + 1;
 653         udev->portnr = port;
 654         debug("Calling usb_setup_device(), portnr=%d\n", udev->portnr);
 655         parent_udev = device_get_uclass_id(parent) == UCLASS_USB_HUB ?
 656                 dev_get_parent_priv(parent) : NULL;
 657         ret = usb_setup_device(udev, priv->desc_before_addr, parent_udev);
 658         debug("read_descriptor for '%s': ret=%d\n", parent->name, ret);
 659         if (ret)
 660                 return ret;
 661         ret = usb_find_child(parent, &udev->descriptor, iface, &dev);
 662         debug("** usb_find_child returns %d\n", ret);
 663         if (ret) {
 664                 if (ret != -ENOENT)
 665                         return ret;
 666                 ret = usb_find_and_bind_driver(parent, &udev->descriptor,
 667                                                iface,
 668                                                dev_seq(udev->controller_dev),
 669                                                udev->devnum, port, &dev);
 670                 if (ret)
 671                         return ret;
 672                 created = true;
 673         }
 674         plat = dev_get_parent_plat(dev);
 675         debug("%s: Probing '%s', plat=%p\n", __func__, dev->name, plat);
 676         plat->devnum = udev->devnum;
 677         plat->udev = udev;
 678         priv->next_addr++;
 679         ret = device_probe(dev);
 680         if (ret) {
 681                 debug("%s: Device '%s' probe failed\n", __func__, dev->name);
 682                 priv->next_addr--;
 683                 if (created)
 684                         device_unbind(dev);
 685                 return ret;
 686         }
 687         *devp = dev;
 688
 689         return 0;
 690 }
 691
 692 /*
 693  * Detect if a USB device has been plugged or unplugged.
 694  */
 695 int usb_detect_change(void)
 696 {
 697         struct udevice *hub;
 698         struct uclass *uc;
 699         int change = 0;
 700         int ret;
 701
 702         ret = uclass_get(UCLASS_USB_HUB, &uc);
 703         if (ret)
 704                 return ret;
 705
 706         uclass_foreach_dev(hub, uc) {
 707                 struct usb_device *udev;
 708                 struct udevice *dev;
 709
 710                 if (!device_active(hub))
 711                         continue;
 712                 for (device_find_first_child(hub, &dev);
 713                      dev;
 714                      device_find_next_child(&dev)) {
 715                         struct usb_port_status status;
 716
 717                         if (!device_active(dev))
 718                                 continue;
 719
 720                         udev = dev_get_parent_priv(dev);
 721                         if (usb_get_port_status(udev, udev->portnr, &status)
 722                                         < 0)
 723                                 /* USB request failed */
 724                                 continue;
 725
 726                         if (le16_to_cpu(status.wPortChange) &
 727                             USB_PORT_STAT_C_CONNECTION)
 728                                 change++;
 729                 }
 730         }
 731
 732         return change;
 733 }
 734
 735 static int usb_child_post_bind(struct udevice *dev)
 736 {
 737         struct usb_dev_plat *plat = dev_get_parent_plat(dev);
 738         int val;
 739
 740         if (!dev_has_ofnode(dev))
 741                 return 0;
 742
 743         /* We only support matching a few things */
 744         val = dev_read_u32_default(dev, "usb,device-class", -1);
 745         if (val != -1) {
 746                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_DEV_CLASS;
 747                 plat->id.bDeviceClass = val;
 748         }
 749         val = dev_read_u32_default(dev, "usb,interface-class", -1);
 750         if (val != -1) {
 751                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_INT_CLASS;
 752                 plat->id.bInterfaceClass = val;
 753         }
 754
 755         return 0;
 756 }
 757
 758 struct udevice *usb_get_bus(struct udevice *dev)
 759 {
 760         struct udevice *bus;
 761
 762         for (bus = dev; bus && device_get_uclass_id(bus) != UCLASS_USB; )
 763                 bus = bus->parent;
 764         if (!bus) {
 765                 /* By design this cannot happen */
 766                 assert(bus);
 767                 debug("USB HUB '%s' does not have a controller\n", dev->name);
 768         }
 769
 770         return bus;
 771 }
 772
 773 int usb_child_pre_probe(struct udevice *dev)
 774 {
 775         struct usb_device *udev = dev_get_parent_priv(dev);
 776         struct usb_dev_plat *plat = dev_get_parent_plat(dev);
 777         int ret;
 778
 779         if (plat->udev) {
 780                 /*
 781                  * Copy over all the values set in the on stack struct
 782                  * usb_device in usb_scan_device() to our final struct
 783                  * usb_device for this dev.
 784                  */
 785                 *udev = *(plat->udev);
 786                 /* And clear plat->udev as it will not be valid for long */
 787                 plat->udev = NULL;
 788                 udev->dev = dev;
 789         } else {
 790                 /*
 791                  * This happens with devices which are explicitly bound
 792                  * instead of being discovered through usb_scan_device()
 793                  * such as sandbox emul devices.
 794                  */
 795                 udev->dev = dev;
 796                 udev->controller_dev = usb_get_bus(dev);
 797                 udev->devnum = plat->devnum;
 798
 799                 /*
 800                  * udev did not go through usb_scan_device(), so we need to
 801                  * select the config and read the config descriptors.
 802                  */
 803                 ret = usb_select_config(udev);
 804                 if (ret)
 805                         return ret;
 806         }
 807
 808         return 0;
 809 }
 810
 811 UCLASS_DRIVER(usb) = {
 812         .id             = UCLASS_USB,
 813         .name           = "usb",
 814         .flags          = DM_UC_FLAG_SEQ_ALIAS,
 815         .post_bind      = dm_scan_fdt_dev,
 816         .priv_auto      = sizeof(struct usb_uclass_priv),
 817         .per_child_auto = sizeof(struct usb_device),
 818         .per_device_auto        = sizeof(struct usb_bus_priv),
 819         .child_post_bind = usb_child_post_bind,
 820         .child_pre_probe = usb_child_pre_probe,
 821         .per_child_plat_auto    = sizeof(struct usb_dev_plat),
 822 };
 823
 824 UCLASS_DRIVER(usb_dev_generic) = {
 825         .id             = UCLASS_USB_DEV_GENERIC,
 826         .name           = "usb_dev_generic",
 827 };
 828
 829 U_BOOT_DRIVER(usb_dev_generic_drv) = {
 830         .id             = UCLASS_USB_DEV_GENERIC,
 831         .name           = "usb_dev_generic_drv",
 832 };