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