Merge tag 'u-boot-amlogic-20200708' of https://gitlab.denx.de/u-boot/custodians/u...
[platform/kernel/u-boot.git] / 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 <log.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 extern bool usb_started; /* flag for the started/stopped USB status */
20 static bool asynch_allowed;
21
22 struct usb_uclass_priv {
23         int companion_device_count;
24 };
25
26 int usb_lock_async(struct usb_device *udev, int lock)
27 {
28         struct udevice *bus = udev->controller_dev;
29         struct dm_usb_ops *ops = usb_get_ops(bus);
30
31         if (!ops->lock_async)
32                 return -ENOSYS;
33
34         return ops->lock_async(bus, lock);
35 }
36
37 int usb_disable_asynch(int disable)
38 {
39         int old_value = asynch_allowed;
40
41         asynch_allowed = !disable;
42         return old_value;
43 }
44
45 int submit_int_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
46                    int length, int interval, bool nonblock)
47 {
48         struct udevice *bus = udev->controller_dev;
49         struct dm_usb_ops *ops = usb_get_ops(bus);
50
51         if (!ops->interrupt)
52                 return -ENOSYS;
53
54         return ops->interrupt(bus, udev, pipe, buffer, length, interval,
55                               nonblock);
56 }
57
58 int submit_control_msg(struct usb_device *udev, unsigned long pipe,
59                        void *buffer, int length, struct devrequest *setup)
60 {
61         struct udevice *bus = udev->controller_dev;
62         struct dm_usb_ops *ops = usb_get_ops(bus);
63         struct usb_uclass_priv *uc_priv = bus->uclass->priv;
64         int err;
65
66         if (!ops->control)
67                 return -ENOSYS;
68
69         err = ops->control(bus, udev, pipe, buffer, length, setup);
70         if (setup->request == USB_REQ_SET_FEATURE &&
71             setup->requesttype == USB_RT_PORT &&
72             setup->value == cpu_to_le16(USB_PORT_FEAT_RESET) &&
73             err == -ENXIO) {
74                 /* Device handed over to companion after port reset */
75                 uc_priv->companion_device_count++;
76         }
77
78         return err;
79 }
80
81 int submit_bulk_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
82                     int length)
83 {
84         struct udevice *bus = udev->controller_dev;
85         struct dm_usb_ops *ops = usb_get_ops(bus);
86
87         if (!ops->bulk)
88                 return -ENOSYS;
89
90         return ops->bulk(bus, udev, pipe, buffer, length);
91 }
92
93 struct int_queue *create_int_queue(struct usb_device *udev,
94                 unsigned long pipe, int queuesize, int elementsize,
95                 void *buffer, int interval)
96 {
97         struct udevice *bus = udev->controller_dev;
98         struct dm_usb_ops *ops = usb_get_ops(bus);
99
100         if (!ops->create_int_queue)
101                 return NULL;
102
103         return ops->create_int_queue(bus, udev, pipe, queuesize, elementsize,
104                                      buffer, interval);
105 }
106
107 void *poll_int_queue(struct usb_device *udev, struct int_queue *queue)
108 {
109         struct udevice *bus = udev->controller_dev;
110         struct dm_usb_ops *ops = usb_get_ops(bus);
111
112         if (!ops->poll_int_queue)
113                 return NULL;
114
115         return ops->poll_int_queue(bus, udev, queue);
116 }
117
118 int destroy_int_queue(struct usb_device *udev, struct int_queue *queue)
119 {
120         struct udevice *bus = udev->controller_dev;
121         struct dm_usb_ops *ops = usb_get_ops(bus);
122
123         if (!ops->destroy_int_queue)
124                 return -ENOSYS;
125
126         return ops->destroy_int_queue(bus, udev, queue);
127 }
128
129 int usb_alloc_device(struct usb_device *udev)
130 {
131         struct udevice *bus = udev->controller_dev;
132         struct dm_usb_ops *ops = usb_get_ops(bus);
133
134         /* This is only requird by some controllers - current XHCI */
135         if (!ops->alloc_device)
136                 return 0;
137
138         return ops->alloc_device(bus, udev);
139 }
140
141 int usb_reset_root_port(struct usb_device *udev)
142 {
143         struct udevice *bus = udev->controller_dev;
144         struct dm_usb_ops *ops = usb_get_ops(bus);
145
146         if (!ops->reset_root_port)
147                 return -ENOSYS;
148
149         return ops->reset_root_port(bus, udev);
150 }
151
152 int usb_update_hub_device(struct usb_device *udev)
153 {
154         struct udevice *bus = udev->controller_dev;
155         struct dm_usb_ops *ops = usb_get_ops(bus);
156
157         if (!ops->update_hub_device)
158                 return -ENOSYS;
159
160         return ops->update_hub_device(bus, udev);
161 }
162
163 int usb_get_max_xfer_size(struct usb_device *udev, size_t *size)
164 {
165         struct udevice *bus = udev->controller_dev;
166         struct dm_usb_ops *ops = usb_get_ops(bus);
167
168         if (!ops->get_max_xfer_size)
169                 return -ENOSYS;
170
171         return ops->get_max_xfer_size(bus, size);
172 }
173
174 int usb_stop(void)
175 {
176         struct udevice *bus;
177         struct udevice *rh;
178         struct uclass *uc;
179         struct usb_uclass_priv *uc_priv;
180         int err = 0, ret;
181
182         /* De-activate any devices that have been activated */
183         ret = uclass_get(UCLASS_USB, &uc);
184         if (ret)
185                 return ret;
186
187         uc_priv = uc->priv;
188
189         uclass_foreach_dev(bus, uc) {
190                 ret = device_remove(bus, DM_REMOVE_NORMAL);
191                 if (ret && !err)
192                         err = ret;
193
194                 /* Locate root hub device */
195                 device_find_first_child(bus, &rh);
196                 if (rh) {
197                         /*
198                          * All USB devices are children of root hub.
199                          * Unbinding root hub will unbind all of its children.
200                          */
201                         ret = device_unbind(rh);
202                         if (ret && !err)
203                                 err = ret;
204                 }
205         }
206
207 #ifdef CONFIG_USB_STORAGE
208         usb_stor_reset();
209 #endif
210         uc_priv->companion_device_count = 0;
211         usb_started = 0;
212
213         return err;
214 }
215
216 static void usb_scan_bus(struct udevice *bus, bool recurse)
217 {
218         struct usb_bus_priv *priv;
219         struct udevice *dev;
220         int ret;
221
222         priv = dev_get_uclass_priv(bus);
223
224         assert(recurse);        /* TODO: Support non-recusive */
225
226         printf("scanning bus %s for devices... ", bus->name);
227         debug("\n");
228         ret = usb_scan_device(bus, 0, USB_SPEED_FULL, &dev);
229         if (ret)
230                 printf("failed, error %d\n", ret);
231         else if (priv->next_addr == 0)
232                 printf("No USB Device found\n");
233         else
234                 printf("%d USB Device(s) found\n", priv->next_addr);
235 }
236
237 static void remove_inactive_children(struct uclass *uc, struct udevice *bus)
238 {
239         uclass_foreach_dev(bus, uc) {
240                 struct udevice *dev, *next;
241
242                 if (!device_active(bus))
243                         continue;
244                 device_foreach_child_safe(dev, next, bus) {
245                         if (!device_active(dev))
246                                 device_unbind(dev);
247                 }
248         }
249 }
250
251 int usb_init(void)
252 {
253         int controllers_initialized = 0;
254         struct usb_uclass_priv *uc_priv;
255         struct usb_bus_priv *priv;
256         struct udevice *bus;
257         struct uclass *uc;
258         int ret;
259
260         asynch_allowed = 1;
261
262         ret = uclass_get(UCLASS_USB, &uc);
263         if (ret)
264                 return ret;
265
266         uc_priv = uc->priv;
267
268         uclass_foreach_dev(bus, uc) {
269                 /* init low_level USB */
270                 printf("Bus %s: ", bus->name);
271
272 #ifdef CONFIG_SANDBOX
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                 ret = dm_scan_fdt_dev(bus);
280                 if (ret) {
281                         printf("Sandbox USB device scan failed (%d)\n", ret);
282                         continue;
283                 }
284 #endif
285
286                 ret = device_probe(bus);
287                 if (ret == -ENODEV) {   /* No such device. */
288                         puts("Port not available.\n");
289                         controllers_initialized++;
290                         continue;
291                 }
292
293                 if (ret) {              /* Other error. */
294                         printf("probe failed, error %d\n", ret);
295                         continue;
296                 }
297                 controllers_initialized++;
298                 usb_started = true;
299         }
300
301         /*
302          * lowlevel init done, now scan the bus for devices i.e. search HUBs
303          * and configure them, first scan primary controllers.
304          */
305         uclass_foreach_dev(bus, uc) {
306                 if (!device_active(bus))
307                         continue;
308
309                 priv = dev_get_uclass_priv(bus);
310                 if (!priv->companion)
311                         usb_scan_bus(bus, true);
312         }
313
314         /*
315          * Now that the primary controllers have been scanned and have handed
316          * over any devices they do not understand to their companions, scan
317          * the companions if necessary.
318          */
319         if (uc_priv->companion_device_count) {
320                 uclass_foreach_dev(bus, uc) {
321                         if (!device_active(bus))
322                                 continue;
323
324                         priv = dev_get_uclass_priv(bus);
325                         if (priv->companion)
326                                 usb_scan_bus(bus, true);
327                 }
328         }
329
330         debug("scan end\n");
331
332         /* Remove any devices that were not found on this scan */
333         remove_inactive_children(uc, bus);
334
335         ret = uclass_get(UCLASS_USB_HUB, &uc);
336         if (ret)
337                 return ret;
338         remove_inactive_children(uc, bus);
339
340         /* if we were not able to find at least one working bus, bail out */
341         if (controllers_initialized == 0)
342                 printf("No working controllers found\n");
343
344         return usb_started ? 0 : -1;
345 }
346
347 /*
348  * TODO(sjg@chromium.org): Remove this legacy function. At present it is needed
349  * to support boards which use driver model for USB but not Ethernet, and want
350  * to use USB Ethernet.
351  *
352  * The #if clause is here to ensure that remains the only case.
353  */
354 #if !defined(CONFIG_DM_ETH) && defined(CONFIG_USB_HOST_ETHER)
355 static struct usb_device *find_child_devnum(struct udevice *parent, int devnum)
356 {
357         struct usb_device *udev;
358         struct udevice *dev;
359
360         if (!device_active(parent))
361                 return NULL;
362         udev = dev_get_parent_priv(parent);
363         if (udev->devnum == devnum)
364                 return udev;
365
366         for (device_find_first_child(parent, &dev);
367              dev;
368              device_find_next_child(&dev)) {
369                 udev = find_child_devnum(dev, devnum);
370                 if (udev)
371                         return udev;
372         }
373
374         return NULL;
375 }
376
377 struct usb_device *usb_get_dev_index(struct udevice *bus, int index)
378 {
379         struct udevice *dev;
380         int devnum = index + 1; /* Addresses are allocated from 1 on USB */
381
382         device_find_first_child(bus, &dev);
383         if (!dev)
384                 return NULL;
385
386         return find_child_devnum(dev, devnum);
387 }
388 #endif
389
390 int usb_setup_ehci_gadget(struct ehci_ctrl **ctlrp)
391 {
392         struct usb_platdata *plat;
393         struct udevice *dev;
394         int ret;
395
396         /* Find the old device and remove it */
397         ret = uclass_find_device_by_seq(UCLASS_USB, 0, true, &dev);
398         if (ret)
399                 return ret;
400         ret = device_remove(dev, DM_REMOVE_NORMAL);
401         if (ret)
402                 return ret;
403
404         plat = dev_get_platdata(dev);
405         plat->init_type = USB_INIT_DEVICE;
406         ret = device_probe(dev);
407         if (ret)
408                 return ret;
409         *ctlrp = dev_get_priv(dev);
410
411         return 0;
412 }
413
414 /* returns 0 if no match, 1 if match */
415 static int usb_match_device(const struct usb_device_descriptor *desc,
416                             const struct usb_device_id *id)
417 {
418         if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
419             id->idVendor != le16_to_cpu(desc->idVendor))
420                 return 0;
421
422         if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
423             id->idProduct != le16_to_cpu(desc->idProduct))
424                 return 0;
425
426         /* No need to test id->bcdDevice_lo != 0, since 0 is never
427            greater than any unsigned number. */
428         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
429             (id->bcdDevice_lo > le16_to_cpu(desc->bcdDevice)))
430                 return 0;
431
432         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
433             (id->bcdDevice_hi < le16_to_cpu(desc->bcdDevice)))
434                 return 0;
435
436         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
437             (id->bDeviceClass != desc->bDeviceClass))
438                 return 0;
439
440         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
441             (id->bDeviceSubClass != desc->bDeviceSubClass))
442                 return 0;
443
444         if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
445             (id->bDeviceProtocol != desc->bDeviceProtocol))
446                 return 0;
447
448         return 1;
449 }
450
451 /* returns 0 if no match, 1 if match */
452 static int usb_match_one_id_intf(const struct usb_device_descriptor *desc,
453                         const struct usb_interface_descriptor *int_desc,
454                         const struct usb_device_id *id)
455 {
456         /* The interface class, subclass, protocol and number should never be
457          * checked for a match if the device class is Vendor Specific,
458          * unless the match record specifies the Vendor ID. */
459         if (desc->bDeviceClass == USB_CLASS_VENDOR_SPEC &&
460             !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
461             (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS |
462                                 USB_DEVICE_ID_MATCH_INT_SUBCLASS |
463                                 USB_DEVICE_ID_MATCH_INT_PROTOCOL |
464                                 USB_DEVICE_ID_MATCH_INT_NUMBER)))
465                 return 0;
466
467         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
468             (id->bInterfaceClass != int_desc->bInterfaceClass))
469                 return 0;
470
471         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) &&
472             (id->bInterfaceSubClass != int_desc->bInterfaceSubClass))
473                 return 0;
474
475         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) &&
476             (id->bInterfaceProtocol != int_desc->bInterfaceProtocol))
477                 return 0;
478
479         if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_NUMBER) &&
480             (id->bInterfaceNumber != int_desc->bInterfaceNumber))
481                 return 0;
482
483         return 1;
484 }
485
486 /* returns 0 if no match, 1 if match */
487 static int usb_match_one_id(struct usb_device_descriptor *desc,
488                             struct usb_interface_descriptor *int_desc,
489                             const struct usb_device_id *id)
490 {
491         if (!usb_match_device(desc, id))
492                 return 0;
493
494         return usb_match_one_id_intf(desc, int_desc, id);
495 }
496
497 static ofnode usb_get_ofnode(struct udevice *hub, int port)
498 {
499         ofnode node;
500         u32 reg;
501
502         if (!dev_has_of_node(hub))
503                 return ofnode_null();
504
505         /*
506          * The USB controller and its USB hub are two different udevices,
507          * but the device tree has only one node for both. Thus we are
508          * assigning this node to both udevices.
509          * If port is zero, the controller scans its root hub, thus we
510          * are using the same ofnode as the controller here.
511          */
512         if (!port)
513                 return dev_ofnode(hub);
514
515         ofnode_for_each_subnode(node, dev_ofnode(hub)) {
516                 if (ofnode_read_u32(node, "reg", &reg))
517                         continue;
518
519                 if (reg == port)
520                         return node;
521         }
522
523         return ofnode_null();
524 }
525
526 /**
527  * usb_find_and_bind_driver() - Find and bind the right USB driver
528  *
529  * This only looks at certain fields in the descriptor.
530  */
531 static int usb_find_and_bind_driver(struct udevice *parent,
532                                     struct usb_device_descriptor *desc,
533                                     struct usb_interface_descriptor *iface,
534                                     int bus_seq, int devnum, int port,
535                                     struct udevice **devp)
536 {
537         struct usb_driver_entry *start, *entry;
538         int n_ents;
539         int ret;
540         char name[30], *str;
541         ofnode node = usb_get_ofnode(parent, port);
542
543         *devp = NULL;
544         debug("%s: Searching for driver\n", __func__);
545         start = ll_entry_start(struct usb_driver_entry, usb_driver_entry);
546         n_ents = ll_entry_count(struct usb_driver_entry, usb_driver_entry);
547         for (entry = start; entry != start + n_ents; entry++) {
548                 const struct usb_device_id *id;
549                 struct udevice *dev;
550                 const struct driver *drv;
551                 struct usb_dev_platdata *plat;
552
553                 for (id = entry->match; id->match_flags; id++) {
554                         if (!usb_match_one_id(desc, iface, id))
555                                 continue;
556
557                         drv = entry->driver;
558                         /*
559                          * We could pass the descriptor to the driver as
560                          * platdata (instead of NULL) and allow its bind()
561                          * method to return -ENOENT if it doesn't support this
562                          * device. That way we could continue the search to
563                          * find another driver. For now this doesn't seem
564                          * necesssary, so just bind the first match.
565                          */
566                         ret = device_bind_ofnode(parent, drv, drv->name, NULL,
567                                                  node, &dev);
568                         if (ret)
569                                 goto error;
570                         debug("%s: Match found: %s\n", __func__, drv->name);
571                         dev->driver_data = id->driver_info;
572                         plat = dev_get_parent_platdata(dev);
573                         plat->id = *id;
574                         *devp = dev;
575                         return 0;
576                 }
577         }
578
579         /* Bind a generic driver so that the device can be used */
580         snprintf(name, sizeof(name), "generic_bus_%x_dev_%x", bus_seq, devnum);
581         str = strdup(name);
582         if (!str)
583                 return -ENOMEM;
584         ret = device_bind_driver(parent, "usb_dev_generic_drv", str, devp);
585
586 error:
587         debug("%s: No match found: %d\n", __func__, ret);
588         return ret;
589 }
590
591 /**
592  * usb_find_child() - Find an existing device which matches our needs
593  *
594  *
595  */
596 static int usb_find_child(struct udevice *parent,
597                           struct usb_device_descriptor *desc,
598                           struct usb_interface_descriptor *iface,
599                           struct udevice **devp)
600 {
601         struct udevice *dev;
602
603         *devp = NULL;
604         for (device_find_first_child(parent, &dev);
605              dev;
606              device_find_next_child(&dev)) {
607                 struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
608
609                 /* If this device is already in use, skip it */
610                 if (device_active(dev))
611                         continue;
612                 debug("   %s: name='%s', plat=%d, desc=%d\n", __func__,
613                       dev->name, plat->id.bDeviceClass, desc->bDeviceClass);
614                 if (usb_match_one_id(desc, iface, &plat->id)) {
615                         *devp = dev;
616                         return 0;
617                 }
618         }
619
620         return -ENOENT;
621 }
622
623 int usb_scan_device(struct udevice *parent, int port,
624                     enum usb_device_speed speed, struct udevice **devp)
625 {
626         struct udevice *dev;
627         bool created = false;
628         struct usb_dev_platdata *plat;
629         struct usb_bus_priv *priv;
630         struct usb_device *parent_udev;
631         int ret;
632         ALLOC_CACHE_ALIGN_BUFFER(struct usb_device, udev, 1);
633         struct usb_interface_descriptor *iface = &udev->config.if_desc[0].desc;
634
635         *devp = NULL;
636         memset(udev, '\0', sizeof(*udev));
637         udev->controller_dev = usb_get_bus(parent);
638         priv = dev_get_uclass_priv(udev->controller_dev);
639
640         /*
641          * Somewhat nasty, this. We create a local device and use the normal
642          * USB stack to read its descriptor. Then we know what type of device
643          * to create for real.
644          *
645          * udev->dev is set to the parent, since we don't have a real device
646          * yet. The USB stack should not access udev.dev anyway, except perhaps
647          * to find the controller, and the controller will either be @parent,
648          * or some parent of @parent.
649          *
650          * Another option might be to create the device as a generic USB
651          * device, then morph it into the correct one when we know what it
652          * should be. This means that a generic USB device would morph into
653          * a network controller, or a USB flash stick, for example. However,
654          * we don't support such morphing and it isn't clear that it would
655          * be easy to do.
656          *
657          * Yet another option is to split out the USB stack parts of udev
658          * into something like a 'struct urb' (as Linux does) which can exist
659          * independently of any device. This feels cleaner, but calls for quite
660          * a big change to the USB stack.
661          *
662          * For now, the approach is to set up an empty udev, read its
663          * descriptor and assign it an address, then bind a real device and
664          * stash the resulting information into the device's parent
665          * platform data. Then when we probe it, usb_child_pre_probe() is called
666          * and it will pull the information out of the stash.
667          */
668         udev->dev = parent;
669         udev->speed = speed;
670         udev->devnum = priv->next_addr + 1;
671         udev->portnr = port;
672         debug("Calling usb_setup_device(), portnr=%d\n", udev->portnr);
673         parent_udev = device_get_uclass_id(parent) == UCLASS_USB_HUB ?
674                 dev_get_parent_priv(parent) : NULL;
675         ret = usb_setup_device(udev, priv->desc_before_addr, parent_udev);
676         debug("read_descriptor for '%s': ret=%d\n", parent->name, ret);
677         if (ret)
678                 return ret;
679         ret = usb_find_child(parent, &udev->descriptor, iface, &dev);
680         debug("** usb_find_child returns %d\n", ret);
681         if (ret) {
682                 if (ret != -ENOENT)
683                         return ret;
684                 ret = usb_find_and_bind_driver(parent, &udev->descriptor,
685                                                iface,
686                                                udev->controller_dev->seq,
687                                                udev->devnum, port, &dev);
688                 if (ret)
689                         return ret;
690                 created = true;
691         }
692         plat = dev_get_parent_platdata(dev);
693         debug("%s: Probing '%s', plat=%p\n", __func__, dev->name, plat);
694         plat->devnum = udev->devnum;
695         plat->udev = udev;
696         priv->next_addr++;
697         ret = device_probe(dev);
698         if (ret) {
699                 debug("%s: Device '%s' probe failed\n", __func__, dev->name);
700                 priv->next_addr--;
701                 if (created)
702                         device_unbind(dev);
703                 return ret;
704         }
705         *devp = dev;
706
707         return 0;
708 }
709
710 /*
711  * Detect if a USB device has been plugged or unplugged.
712  */
713 int usb_detect_change(void)
714 {
715         struct udevice *hub;
716         struct uclass *uc;
717         int change = 0;
718         int ret;
719
720         ret = uclass_get(UCLASS_USB_HUB, &uc);
721         if (ret)
722                 return ret;
723
724         uclass_foreach_dev(hub, uc) {
725                 struct usb_device *udev;
726                 struct udevice *dev;
727
728                 if (!device_active(hub))
729                         continue;
730                 for (device_find_first_child(hub, &dev);
731                      dev;
732                      device_find_next_child(&dev)) {
733                         struct usb_port_status status;
734
735                         if (!device_active(dev))
736                                 continue;
737
738                         udev = dev_get_parent_priv(dev);
739                         if (usb_get_port_status(udev, udev->portnr, &status)
740                                         < 0)
741                                 /* USB request failed */
742                                 continue;
743
744                         if (le16_to_cpu(status.wPortChange) &
745                             USB_PORT_STAT_C_CONNECTION)
746                                 change++;
747                 }
748         }
749
750         return change;
751 }
752
753 static int usb_child_post_bind(struct udevice *dev)
754 {
755         struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
756         int val;
757
758         if (!dev_of_valid(dev))
759                 return 0;
760
761         /* We only support matching a few things */
762         val = dev_read_u32_default(dev, "usb,device-class", -1);
763         if (val != -1) {
764                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_DEV_CLASS;
765                 plat->id.bDeviceClass = val;
766         }
767         val = dev_read_u32_default(dev, "usb,interface-class", -1);
768         if (val != -1) {
769                 plat->id.match_flags |= USB_DEVICE_ID_MATCH_INT_CLASS;
770                 plat->id.bInterfaceClass = val;
771         }
772
773         return 0;
774 }
775
776 struct udevice *usb_get_bus(struct udevice *dev)
777 {
778         struct udevice *bus;
779
780         for (bus = dev; bus && device_get_uclass_id(bus) != UCLASS_USB; )
781                 bus = bus->parent;
782         if (!bus) {
783                 /* By design this cannot happen */
784                 assert(bus);
785                 debug("USB HUB '%s' does not have a controller\n", dev->name);
786         }
787
788         return bus;
789 }
790
791 int usb_child_pre_probe(struct udevice *dev)
792 {
793         struct usb_device *udev = dev_get_parent_priv(dev);
794         struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
795         int ret;
796
797         if (plat->udev) {
798                 /*
799                  * Copy over all the values set in the on stack struct
800                  * usb_device in usb_scan_device() to our final struct
801                  * usb_device for this dev.
802                  */
803                 *udev = *(plat->udev);
804                 /* And clear plat->udev as it will not be valid for long */
805                 plat->udev = NULL;
806                 udev->dev = dev;
807         } else {
808                 /*
809                  * This happens with devices which are explicitly bound
810                  * instead of being discovered through usb_scan_device()
811                  * such as sandbox emul devices.
812                  */
813                 udev->dev = dev;
814                 udev->controller_dev = usb_get_bus(dev);
815                 udev->devnum = plat->devnum;
816
817                 /*
818                  * udev did not go through usb_scan_device(), so we need to
819                  * select the config and read the config descriptors.
820                  */
821                 ret = usb_select_config(udev);
822                 if (ret)
823                         return ret;
824         }
825
826         return 0;
827 }
828
829 UCLASS_DRIVER(usb) = {
830         .id             = UCLASS_USB,
831         .name           = "usb",
832         .flags          = DM_UC_FLAG_SEQ_ALIAS,
833         .post_bind      = dm_scan_fdt_dev,
834         .priv_auto_alloc_size = sizeof(struct usb_uclass_priv),
835         .per_child_auto_alloc_size = sizeof(struct usb_device),
836         .per_device_auto_alloc_size = sizeof(struct usb_bus_priv),
837         .child_post_bind = usb_child_post_bind,
838         .child_pre_probe = usb_child_pre_probe,
839         .per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
840 };
841
842 UCLASS_DRIVER(usb_dev_generic) = {
843         .id             = UCLASS_USB_DEV_GENERIC,
844         .name           = "usb_dev_generic",
845 };
846
847 U_BOOT_DRIVER(usb_dev_generic_drv) = {
848         .id             = UCLASS_USB_DEV_GENERIC,
849         .name           = "usb_dev_generic_drv",
850 };