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 %s for devices... ", bus->name);
 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 ret;
 246
 247         asynch_allowed = 1;
 248
 249         ret = uclass_get(UCLASS_USB, &uc);
 250         if (ret)
 251                 return ret;
 252
 253         uc_priv = uc->priv;
 254
 255         uclass_foreach_dev(bus, uc) {
 256                 /* init low_level USB */
 257                 printf("Bus %s: ", bus->name);
 258
 259 #ifdef CONFIG_SANDBOX
 260                 /*
 261                  * For Sandbox, we need scan the device tree each time when we
 262                  * start the USB stack, in order to re-create the emulated USB
 263                  * devices and bind drivers for them before we actually do the
 264                  * driver probe.
 265                  */
 266                 ret = dm_scan_fdt_dev(bus);
 267                 if (ret) {
 268                         printf("Sandbox USB device scan failed (%d)\n", ret);
 269                         continue;
 270                 }
 271 #endif
 272
 273                 ret = device_probe(bus);
 274                 if (ret == -ENODEV) {   /* No such device. */
 275                         puts("Port not available.\n");
 276                         controllers_initialized++;
 277                         continue;
 278                 }
 279
 280                 if (ret) {              /* Other error. */
 281                         printf("probe failed, error %d\n", ret);
 282                         continue;
 283                 }
 284                 controllers_initialized++;
 285                 usb_started = true;
 286         }
 287
 288         /*
 289          * lowlevel init done, now scan the bus for devices i.e. search HUBs
 290          * and configure them, first scan primary controllers.
 291          */
 292         uclass_foreach_dev(bus, uc) {
 293                 if (!device_active(bus))
 294                         continue;
 295
 296                 priv = dev_get_uclass_priv(bus);
 297                 if (!priv->companion)
 298                         usb_scan_bus(bus, true);
 299         }
 300
 301         /*
 302          * Now that the primary controllers have been scanned and have handed
 303          * over any devices they do not understand to their companions, scan
 304          * the companions if necessary.
 305          */
 306         if (uc_priv->companion_device_count) {
 307                 uclass_foreach_dev(bus, uc) {
 308                         if (!device_active(bus))
 309                                 continue;
 310
 311                         priv = dev_get_uclass_priv(bus);
 312                         if (priv->companion)
 313                                 usb_scan_bus(bus, true);
 314                 }
 315         }
 316
 317         debug("scan end\n");
 318
 319         /* Remove any devices that were not found on this scan */
 320         remove_inactive_children(uc, bus);
 321
 322         ret = uclass_get(UCLASS_USB_HUB, &uc);
 323         if (ret)
 324                 return ret;
 325         remove_inactive_children(uc, bus);
 326
 327         /* if we were not able to find at least one working bus, bail out */
 328         if (controllers_initialized == 0)
 329                 printf("No working controllers found\n");
 330
 331         return usb_started ? 0 : -1;
 332 }
 333
 334 /*
 335  * TODO(sjg@chromium.org): Remove this legacy function. At present it is needed
 336  * to support boards which use driver model for USB but not Ethernet, and want
 337  * to use USB Ethernet.
 338  *
 339  * The #if clause is here to ensure that remains the only case.
 340  */
 341 #if !defined(CONFIG_DM_ETH) && defined(CONFIG_USB_HOST_ETHER)
 342 static struct usb_device *find_child_devnum(struct udevice *parent, int devnum)
 343 {
 344         struct usb_device *udev;
 345         struct udevice *dev;
 346
 347         if (!device_active(parent))
 348                 return NULL;
 349         udev = dev_get_parent_priv(parent);
 350         if (udev->devnum == devnum)
 351                 return udev;
 352
 353         for (device_find_first_child(parent, &dev);
 354              dev;
 355              device_find_next_child(&dev)) {
 356                 udev = find_child_devnum(dev, devnum);
 357                 if (udev)
 358                         return udev;
 359         }
 360
 361         return NULL;
 362 }
 363
 364 struct usb_device *usb_get_dev_index(struct udevice *bus, int index)
 365 {
 366         struct udevice *dev;
 367         int devnum = index + 1; /* Addresses are allocated from 1 on USB */
 368
 369         device_find_first_child(bus, &dev);
 370         if (!dev)
 371                 return NULL;
 372
 373         return find_child_devnum(dev, devnum);
 374 }
 375 #endif
 376
 377 int usb_setup_ehci_gadget(struct ehci_ctrl **ctlrp)
 378 {
 379         struct usb_platdata *plat;
 380         struct udevice *dev;
 381         int ret;
 382
 383         /* Find the old device and remove it */
 384         ret = uclass_find_device_by_seq(UCLASS_USB, 0, true, &dev);
 385         if (ret)
 386                 return ret;
 387         ret = device_remove(dev, DM_REMOVE_NORMAL);
 388         if (ret)
 389                 return ret;
 390
 391         plat = dev_get_platdata(dev);
 392         plat->init_type = USB_INIT_DEVICE;
 393         ret = device_probe(dev);
 394         if (ret)
 395                 return ret;
 396         *ctlrp = dev_get_priv(dev);
 397
 398         return 0;
 399 }
 400
 401 /* returns 0 if no match, 1 if match */
 402 static int usb_match_device(const struct usb_device_descriptor *desc,
 403                             const struct usb_device_id *id)
 404 {
 405         if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
 406             id->idVendor != le16_to_cpu(desc->idVendor))
 407                 return 0;
 408
 409         if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
 410             id->idProduct != le16_to_cpu(desc->idProduct))
 411                 return 0;
 412
 413         /* No need to test id->bcdDevice_lo != 0, since 0 is never
 414            greater than any unsigned number. */
 415         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
 416             (id->bcdDevice_lo > le16_to_cpu(desc->bcdDevice)))
 417                 return 0;
 418
 419         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
 420             (id->bcdDevice_hi < le16_to_cpu(desc->bcdDevice)))
 421                 return 0;
 422
 423         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
 424             (id->bDeviceClass != desc->bDeviceClass))
 425                 return 0;
 426
 427         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
 428             (id->bDeviceSubClass != desc->bDeviceSubClass))
 429                 return 0;
 430
 431         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
 432             (id->bDeviceProtocol != desc->bDeviceProtocol))
 433                 return 0;
 434
 435         return 1;
 436 }
 437
 438 /* returns 0 if no match, 1 if match */
 439 static int usb_match_one_id_intf(const struct usb_device_descriptor *desc,
 440                         const struct usb_interface_descriptor *int_desc,
 441                         const struct usb_device_id *id)
 442 {
 443         /* The interface class, subclass, protocol and number should never be
 444          * checked for a match if the device class is Vendor Specific,
 445          * unless the match record specifies the Vendor ID. */
 446         if (desc->bDeviceClass == USB_CLASS_VENDOR_SPEC &&
 447             !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
 448             (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS |
 449                                 USB_DEVICE_ID_MATCH_INT_SUBCLASS |
 450                                 USB_DEVICE_ID_MATCH_INT_PROTOCOL |
 451                                 USB_DEVICE_ID_MATCH_INT_NUMBER)))
 452                 return 0;
 453
 454         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
 455             (id->bInterfaceClass != int_desc->bInterfaceClass))
 456                 return 0;
 457
 458         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) &&
 459             (id->bInterfaceSubClass != int_desc->bInterfaceSubClass))
 460                 return 0;
 461
 462         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) &&
 463             (id->bInterfaceProtocol != int_desc->bInterfaceProtocol))
 464                 return 0;
 465
 466         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_NUMBER) &&
 467             (id->bInterfaceNumber != int_desc->bInterfaceNumber))
 468                 return 0;
 469
 470         return 1;
 471 }
 472
 473 /* returns 0 if no match, 1 if match */
 474 static int usb_match_one_id(struct usb_device_descriptor *desc,
 475                             struct usb_interface_descriptor *int_desc,
 476                             const struct usb_device_id *id)
 477 {
 478         if (!usb_match_device(desc, id))
 479                 return 0;
 480
 481         return usb_match_one_id_intf(desc, int_desc, id);
 482 }
 483
 484 /**
 485  * usb_find_and_bind_driver() - Find and bind the right USB driver
 486  *
 487  * This only looks at certain fields in the descriptor.
 488  */
 489 static int usb_find_and_bind_driver(struct udevice *parent,
 490                                     struct usb_device_descriptor *desc,
 491                                     struct usb_interface_descriptor *iface,
 492                                     int bus_seq, int devnum,
 493                                     struct udevice **devp)
 494 {
 495         struct usb_driver_entry *start, *entry;
 496         int n_ents;
 497         int ret;
 498         char name[30], *str;
 499
 500         *devp = NULL;
 501         debug("%s: Searching for driver\n", __func__);
 502         start = ll_entry_start(struct usb_driver_entry, usb_driver_entry);
 503         n_ents = ll_entry_count(struct usb_driver_entry, usb_driver_entry);
 504         for (entry = start; entry != start + n_ents; entry++) {
 505                 const struct usb_device_id *id;
 506                 struct udevice *dev;
 507                 const struct driver *drv;
 508                 struct usb_dev_platdata *plat;
 509
 510                 for (id = entry->match; id->match_flags; id++) {
 511                         if (!usb_match_one_id(desc, iface, id))
 512                                 continue;
 513
 514                         drv = entry->driver;
 515                         /*
 516                          * We could pass the descriptor to the driver as
 517                          * platdata (instead of NULL) and allow its bind()
 518                          * method to return -ENOENT if it doesn't support this
 519                          * device. That way we could continue the search to
 520                          * find another driver. For now this doesn't seem
 521                          * necesssary, so just bind the first match.
 522                          */
 523                         ret = device_bind(parent, drv, drv->name, NULL, -1,
 524                                           &dev);
 525                         if (ret)
 526                                 goto error;
 527                         debug("%s: Match found: %s\n", __func__, drv->name);
 528                         dev->driver_data = id->driver_info;
 529                         plat = dev_get_parent_platdata(dev);
 530                         plat->id = *id;
 531                         *devp = dev;
 532                         return 0;
 533                 }
 534         }
 535
 536         /* Bind a generic driver so that the device can be used */
 537         snprintf(name, sizeof(name), "generic_bus_%x_dev_%x", bus_seq, devnum);
 538         str = strdup(name);
 539         if (!str)
 540                 return -ENOMEM;
 541         ret = device_bind_driver(parent, "usb_dev_generic_drv", str, devp);
 542
 543 error:
 544         debug("%s: No match found: %d\n", __func__, ret);
 545         return ret;
 546 }
 547
 548 /**
 549  * usb_find_child() - Find an existing device which matches our needs
 550  *
 551  *
 552  */
 553 static int usb_find_child(struct udevice *parent,
 554                           struct usb_device_descriptor *desc,
 555                           struct usb_interface_descriptor *iface,
 556                           struct udevice **devp)
 557 {
 558         struct udevice *dev;
 559
 560         *devp = NULL;
 561         for (device_find_first_child(parent, &dev);
 562              dev;
 563              device_find_next_child(&dev)) {
 564                 struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 565
 566                 /* If this device is already in use, skip it */
 567                 if (device_active(dev))
 568                         continue;
 569                 debug("   %s: name='%s', plat=%d, desc=%d\n", __func__,
 570                       dev->name, plat->id.bDeviceClass, desc->bDeviceClass);
 571                 if (usb_match_one_id(desc, iface, &plat->id)) {
 572                         *devp = dev;
 573                         return 0;
 574                 }
 575         }
 576
 577         return -ENOENT;
 578 }
 579
 580 int usb_scan_device(struct udevice *parent, int port,
 581                     enum usb_device_speed speed, struct udevice **devp)
 582 {
 583         struct udevice *dev;
 584         bool created = false;
 585         struct usb_dev_platdata *plat;
 586         struct usb_bus_priv *priv;
 587         struct usb_device *parent_udev;
 588         int ret;
 589         ALLOC_CACHE_ALIGN_BUFFER(struct usb_device, udev, 1);
 590         struct usb_interface_descriptor *iface = &udev->config.if_desc[0].desc;
 591
 592         *devp = NULL;
 593         memset(udev, '\0', sizeof(*udev));
 594         udev->controller_dev = usb_get_bus(parent);
 595         priv = dev_get_uclass_priv(udev->controller_dev);
 596
 597         /*
 598          * Somewhat nasty, this. We create a local device and use the normal
 599          * USB stack to read its descriptor. Then we know what type of device
 600          * to create for real.
 601          *
 602          * udev->dev is set to the parent, since we don't have a real device
 603          * yet. The USB stack should not access udev.dev anyway, except perhaps
 604          * to find the controller, and the controller will either be @parent,
 605          * or some parent of @parent.
 606          *
 607          * Another option might be to create the device as a generic USB
 608          * device, then morph it into the correct one when we know what it
 609          * should be. This means that a generic USB device would morph into
 610          * a network controller, or a USB flash stick, for example. However,
 611          * we don't support such morphing and it isn't clear that it would
 612          * be easy to do.
 613          *
 614          * Yet another option is to split out the USB stack parts of udev
 615          * into something like a 'struct urb' (as Linux does) which can exist
 616          * independently of any device. This feels cleaner, but calls for quite
 617          * a big change to the USB stack.
 618          *
 619          * For now, the approach is to set up an empty udev, read its
 620          * descriptor and assign it an address, then bind a real device and
 621          * stash the resulting information into the device's parent
 622          * platform data. Then when we probe it, usb_child_pre_probe() is called
 623          * and it will pull the information out of the stash.
 624          */
 625         udev->dev = parent;
 626         udev->speed = speed;
 627         udev->devnum = priv->next_addr + 1;
 628         udev->portnr = port;
 629         debug("Calling usb_setup_device(), portnr=%d\n", udev->portnr);
 630         parent_udev = device_get_uclass_id(parent) == UCLASS_USB_HUB ?
 631                 dev_get_parent_priv(parent) : NULL;
 632         ret = usb_setup_device(udev, priv->desc_before_addr, parent_udev);
 633         debug("read_descriptor for '%s': ret=%d\n", parent->name, ret);
 634         if (ret)
 635                 return ret;
 636         ret = usb_find_child(parent, &udev->descriptor, iface, &dev);
 637         debug("** usb_find_child returns %d\n", ret);
 638         if (ret) {
 639                 if (ret != -ENOENT)
 640                         return ret;
 641                 ret = usb_find_and_bind_driver(parent, &udev->descriptor, iface,
 642                                                udev->controller_dev->seq,
 643                                                udev->devnum, &dev);
 644                 if (ret)
 645                         return ret;
 646                 created = true;
 647         }
 648         plat = dev_get_parent_platdata(dev);
 649         debug("%s: Probing '%s', plat=%p\n", __func__, dev->name, plat);
 650         plat->devnum = udev->devnum;
 651         plat->udev = udev;
 652         priv->next_addr++;
 653         ret = device_probe(dev);
 654         if (ret) {
 655                 debug("%s: Device '%s' probe failed\n", __func__, dev->name);
 656                 priv->next_addr--;
 657                 if (created)
 658                         device_unbind(dev);
 659                 return ret;
 660         }
 661         *devp = dev;
 662
 663         return 0;
 664 }
 665
 666 /*
 667  * Detect if a USB device has been plugged or unplugged.
 668  */
 669 int usb_detect_change(void)
 670 {
 671         struct udevice *hub;
 672         struct uclass *uc;
 673         int change = 0;
 674         int ret;
 675
 676         ret = uclass_get(UCLASS_USB_HUB, &uc);
 677         if (ret)
 678                 return ret;
 679
 680         uclass_foreach_dev(hub, uc) {
 681                 struct usb_device *udev;
 682                 struct udevice *dev;
 683
 684                 if (!device_active(hub))
 685                         continue;
 686                 for (device_find_first_child(hub, &dev);
 687                      dev;
 688                      device_find_next_child(&dev)) {
 689                         struct usb_port_status status;
 690
 691                         if (!device_active(dev))
 692                                 continue;
 693
 694                         udev = dev_get_parent_priv(dev);
 695                         if (usb_get_port_status(udev, udev->portnr, &status)
 696                                         < 0)
 697                                 /* USB request failed */
 698                                 continue;
 699
 700                         if (le16_to_cpu(status.wPortChange) &
 701                             USB_PORT_STAT_C_CONNECTION)
 702                                 change++;
 703                 }
 704         }
 705
 706         return change;
 707 }
 708
 709 static int usb_child_post_bind(struct udevice *dev)
 710 {
 711         struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 712         int val;
 713
 714         if (!dev_of_valid(dev))
 715                 return 0;
 716
 717         /* We only support matching a few things */
 718         val = dev_read_u32_default(dev, "usb,device-class", -1);
 719         if (val != -1) {
 720                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_DEV_CLASS;
 721                 plat->id.bDeviceClass = val;
 722         }
 723         val = dev_read_u32_default(dev, "usb,interface-class", -1);
 724         if (val != -1) {
 725                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_INT_CLASS;
 726                 plat->id.bInterfaceClass = val;
 727         }
 728
 729         return 0;
 730 }
 731
 732 struct udevice *usb_get_bus(struct udevice *dev)
 733 {
 734         struct udevice *bus;
 735
 736         for (bus = dev; bus && device_get_uclass_id(bus) != UCLASS_USB; )
 737                 bus = bus->parent;
 738         if (!bus) {
 739                 /* By design this cannot happen */
 740                 assert(bus);
 741                 debug("USB HUB '%s' does not have a controller\n", dev->name);
 742         }
 743
 744         return bus;
 745 }
 746
 747 int usb_child_pre_probe(struct udevice *dev)
 748 {
 749         struct usb_device *udev = dev_get_parent_priv(dev);
 750         struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
 751         int ret;
 752
 753         if (plat->udev) {
 754                 /*
 755                  * Copy over all the values set in the on stack struct
 756                  * usb_device in usb_scan_device() to our final struct
 757                  * usb_device for this dev.
 758                  */
 759                 *udev = *(plat->udev);
 760                 /* And clear plat->udev as it will not be valid for long */
 761                 plat->udev = NULL;
 762                 udev->dev = dev;
 763         } else {
 764                 /*
 765                  * This happens with devices which are explicitly bound
 766                  * instead of being discovered through usb_scan_device()
 767                  * such as sandbox emul devices.
 768                  */
 769                 udev->dev = dev;
 770                 udev->controller_dev = usb_get_bus(dev);
 771                 udev->devnum = plat->devnum;
 772
 773                 /*
 774                  * udev did not go through usb_scan_device(), so we need to
 775                  * select the config and read the config descriptors.
 776                  */
 777                 ret = usb_select_config(udev);
 778                 if (ret)
 779                         return ret;
 780         }
 781
 782         return 0;
 783 }
 784
 785 UCLASS_DRIVER(usb) = {
 786         .id             = UCLASS_USB,
 787         .name           = "usb",
 788         .flags          = DM_UC_FLAG_SEQ_ALIAS,
 789         .post_bind      = dm_scan_fdt_dev,
 790         .priv_auto_alloc_size = sizeof(struct usb_uclass_priv),
 791         .per_child_auto_alloc_size = sizeof(struct usb_device),
 792         .per_device_auto_alloc_size = sizeof(struct usb_bus_priv),
 793         .child_post_bind = usb_child_post_bind,
 794         .child_pre_probe = usb_child_pre_probe,
 795         .per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
 796 };
 797
 798 UCLASS_DRIVER(usb_dev_generic) = {
 799         .id             = UCLASS_USB_DEV_GENERIC,
 800         .name           = "usb_dev_generic",
 801 };
 802
 803 U_BOOT_DRIVER(usb_dev_generic_drv) = {
 804         .id             = UCLASS_USB_DEV_GENERIC,
 805         .name           = "usb_dev_generic_drv",
 806 };