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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 
usb_disable_asynch(int disable)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 
submit_int_msg(struct usb_device * udev,unsigned long pipe,void * buffer,int length,int interval,bool nonblock)33 int submit_int_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
34 		   int length, int interval, bool nonblock)
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 			      nonblock);
44 }
45 
submit_control_msg(struct usb_device * udev,unsigned long pipe,void * buffer,int length,struct devrequest * setup)46 int submit_control_msg(struct usb_device *udev, unsigned long pipe,
47 		       void *buffer, int length, struct devrequest *setup)
48 {
49 	struct udevice *bus = udev->controller_dev;
50 	struct dm_usb_ops *ops = usb_get_ops(bus);
51 	struct usb_uclass_priv *uc_priv = bus->uclass->priv;
52 	int err;
53 
54 	if (!ops->control)
55 		return -ENOSYS;
56 
57 	err = ops->control(bus, udev, pipe, buffer, length, setup);
58 	if (setup->request == USB_REQ_SET_FEATURE &&
59 	    setup->requesttype == USB_RT_PORT &&
60 	    setup->value == cpu_to_le16(USB_PORT_FEAT_RESET) &&
61 	    err == -ENXIO) {
62 		/* Device handed over to companion after port reset */
63 		uc_priv->companion_device_count++;
64 	}
65 
66 	return err;
67 }
68 
submit_bulk_msg(struct usb_device * udev,unsigned long pipe,void * buffer,int length)69 int submit_bulk_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
70 		    int length)
71 {
72 	struct udevice *bus = udev->controller_dev;
73 	struct dm_usb_ops *ops = usb_get_ops(bus);
74 
75 	if (!ops->bulk)
76 		return -ENOSYS;
77 
78 	return ops->bulk(bus, udev, pipe, buffer, length);
79 }
80 
create_int_queue(struct usb_device * udev,unsigned long pipe,int queuesize,int elementsize,void * buffer,int interval)81 struct int_queue *create_int_queue(struct usb_device *udev,
82 		unsigned long pipe, int queuesize, int elementsize,
83 		void *buffer, int interval)
84 {
85 	struct udevice *bus = udev->controller_dev;
86 	struct dm_usb_ops *ops = usb_get_ops(bus);
87 
88 	if (!ops->create_int_queue)
89 		return NULL;
90 
91 	return ops->create_int_queue(bus, udev, pipe, queuesize, elementsize,
92 				     buffer, interval);
93 }
94 
poll_int_queue(struct usb_device * udev,struct int_queue * queue)95 void *poll_int_queue(struct usb_device *udev, struct int_queue *queue)
96 {
97 	struct udevice *bus = udev->controller_dev;
98 	struct dm_usb_ops *ops = usb_get_ops(bus);
99 
100 	if (!ops->poll_int_queue)
101 		return NULL;
102 
103 	return ops->poll_int_queue(bus, udev, queue);
104 }
105 
destroy_int_queue(struct usb_device * udev,struct int_queue * queue)106 int destroy_int_queue(struct usb_device *udev, struct int_queue *queue)
107 {
108 	struct udevice *bus = udev->controller_dev;
109 	struct dm_usb_ops *ops = usb_get_ops(bus);
110 
111 	if (!ops->destroy_int_queue)
112 		return -ENOSYS;
113 
114 	return ops->destroy_int_queue(bus, udev, queue);
115 }
116 
usb_alloc_device(struct usb_device * udev)117 int usb_alloc_device(struct usb_device *udev)
118 {
119 	struct udevice *bus = udev->controller_dev;
120 	struct dm_usb_ops *ops = usb_get_ops(bus);
121 
122 	/* This is only requird by some controllers - current XHCI */
123 	if (!ops->alloc_device)
124 		return 0;
125 
126 	return ops->alloc_device(bus, udev);
127 }
128 
usb_reset_root_port(struct usb_device * udev)129 int usb_reset_root_port(struct usb_device *udev)
130 {
131 	struct udevice *bus = udev->controller_dev;
132 	struct dm_usb_ops *ops = usb_get_ops(bus);
133 
134 	if (!ops->reset_root_port)
135 		return -ENOSYS;
136 
137 	return ops->reset_root_port(bus, udev);
138 }
139 
usb_update_hub_device(struct usb_device * udev)140 int usb_update_hub_device(struct usb_device *udev)
141 {
142 	struct udevice *bus = udev->controller_dev;
143 	struct dm_usb_ops *ops = usb_get_ops(bus);
144 
145 	if (!ops->update_hub_device)
146 		return -ENOSYS;
147 
148 	return ops->update_hub_device(bus, udev);
149 }
150 
usb_get_max_xfer_size(struct usb_device * udev,size_t * size)151 int usb_get_max_xfer_size(struct usb_device *udev, size_t *size)
152 {
153 	struct udevice *bus = udev->controller_dev;
154 	struct dm_usb_ops *ops = usb_get_ops(bus);
155 
156 	if (!ops->get_max_xfer_size)
157 		return -ENOSYS;
158 
159 	return ops->get_max_xfer_size(bus, size);
160 }
161 
usb_stop(void)162 int usb_stop(void)
163 {
164 	struct udevice *bus;
165 	struct udevice *rh;
166 	struct uclass *uc;
167 	struct usb_uclass_priv *uc_priv;
168 	int err = 0, ret;
169 
170 	/* De-activate any devices that have been activated */
171 	ret = uclass_get(UCLASS_USB, &uc);
172 	if (ret)
173 		return ret;
174 
175 	uc_priv = uc->priv;
176 
177 	uclass_foreach_dev(bus, uc) {
178 		ret = device_remove(bus, DM_REMOVE_NORMAL);
179 		if (ret && !err)
180 			err = ret;
181 
182 		/* Locate root hub device */
183 		device_find_first_child(bus, &rh);
184 		if (rh) {
185 			/*
186 			 * All USB devices are children of root hub.
187 			 * Unbinding root hub will unbind all of its children.
188 			 */
189 			ret = device_unbind(rh);
190 			if (ret && !err)
191 				err = ret;
192 		}
193 	}
194 
195 #ifdef CONFIG_USB_STORAGE
196 	usb_stor_reset();
197 #endif
198 	uc_priv->companion_device_count = 0;
199 	usb_started = 0;
200 
201 	return err;
202 }
203 
usb_scan_bus(struct udevice * bus,bool recurse)204 static void usb_scan_bus(struct udevice *bus, bool recurse)
205 {
206 	struct usb_bus_priv *priv;
207 	struct udevice *dev;
208 	int ret;
209 
210 	priv = dev_get_uclass_priv(bus);
211 
212 	assert(recurse);	/* TODO: Support non-recusive */
213 
214 	printf("scanning bus %s for devices... ", bus->name);
215 	debug("\n");
216 	ret = usb_scan_device(bus, 0, USB_SPEED_FULL, &dev);
217 	if (ret)
218 		printf("failed, error %d\n", ret);
219 	else if (priv->next_addr == 0)
220 		printf("No USB Device found\n");
221 	else
222 		printf("%d USB Device(s) found\n", priv->next_addr);
223 }
224 
remove_inactive_children(struct uclass * uc,struct udevice * bus)225 static void remove_inactive_children(struct uclass *uc, struct udevice *bus)
226 {
227 	uclass_foreach_dev(bus, uc) {
228 		struct udevice *dev, *next;
229 
230 		if (!device_active(bus))
231 			continue;
232 		device_foreach_child_safe(dev, next, bus) {
233 			if (!device_active(dev))
234 				device_unbind(dev);
235 		}
236 	}
237 }
238 
usb_init(void)239 int usb_init(void)
240 {
241 	int controllers_initialized = 0;
242 	struct usb_uclass_priv *uc_priv;
243 	struct usb_bus_priv *priv;
244 	struct udevice *bus;
245 	struct uclass *uc;
246 	int ret;
247 
248 	asynch_allowed = 1;
249 
250 	ret = uclass_get(UCLASS_USB, &uc);
251 	if (ret)
252 		return ret;
253 
254 	uc_priv = uc->priv;
255 
256 	uclass_foreach_dev(bus, uc) {
257 		/* init low_level USB */
258 		printf("Bus %s: ", bus->name);
259 
260 #ifdef CONFIG_SANDBOX
261 		/*
262 		 * For Sandbox, we need scan the device tree each time when we
263 		 * start the USB stack, in order to re-create the emulated USB
264 		 * devices and bind drivers for them before we actually do the
265 		 * driver probe.
266 		 */
267 		ret = dm_scan_fdt_dev(bus);
268 		if (ret) {
269 			printf("Sandbox USB device scan failed (%d)\n", ret);
270 			continue;
271 		}
272 #endif
273 
274 		ret = device_probe(bus);
275 		if (ret == -ENODEV) {	/* No such device. */
276 			puts("Port not available.\n");
277 			controllers_initialized++;
278 			continue;
279 		}
280 
281 		if (ret) {		/* Other error. */
282 			printf("probe failed, error %d\n", ret);
283 			continue;
284 		}
285 		controllers_initialized++;
286 		usb_started = true;
287 	}
288 
289 	/*
290 	 * lowlevel init done, now scan the bus for devices i.e. search HUBs
291 	 * and configure them, first scan primary controllers.
292 	 */
293 	uclass_foreach_dev(bus, uc) {
294 		if (!device_active(bus))
295 			continue;
296 
297 		priv = dev_get_uclass_priv(bus);
298 		if (!priv->companion)
299 			usb_scan_bus(bus, true);
300 	}
301 
302 	/*
303 	 * Now that the primary controllers have been scanned and have handed
304 	 * over any devices they do not understand to their companions, scan
305 	 * the companions if necessary.
306 	 */
307 	if (uc_priv->companion_device_count) {
308 		uclass_foreach_dev(bus, uc) {
309 			if (!device_active(bus))
310 				continue;
311 
312 			priv = dev_get_uclass_priv(bus);
313 			if (priv->companion)
314 				usb_scan_bus(bus, true);
315 		}
316 	}
317 
318 	debug("scan end\n");
319 
320 	/* Remove any devices that were not found on this scan */
321 	remove_inactive_children(uc, bus);
322 
323 	ret = uclass_get(UCLASS_USB_HUB, &uc);
324 	if (ret)
325 		return ret;
326 	remove_inactive_children(uc, bus);
327 
328 	/* if we were not able to find at least one working bus, bail out */
329 	if (controllers_initialized == 0)
330 		printf("No working controllers found\n");
331 
332 	return usb_started ? 0 : -1;
333 }
334 
335 /*
336  * TODO(sjg@chromium.org): Remove this legacy function. At present it is needed
337  * to support boards which use driver model for USB but not Ethernet, and want
338  * to use USB Ethernet.
339  *
340  * The #if clause is here to ensure that remains the only case.
341  */
342 #if !defined(CONFIG_DM_ETH) && defined(CONFIG_USB_HOST_ETHER)
find_child_devnum(struct udevice * parent,int devnum)343 static struct usb_device *find_child_devnum(struct udevice *parent, int devnum)
344 {
345 	struct usb_device *udev;
346 	struct udevice *dev;
347 
348 	if (!device_active(parent))
349 		return NULL;
350 	udev = dev_get_parent_priv(parent);
351 	if (udev->devnum == devnum)
352 		return udev;
353 
354 	for (device_find_first_child(parent, &dev);
355 	     dev;
356 	     device_find_next_child(&dev)) {
357 		udev = find_child_devnum(dev, devnum);
358 		if (udev)
359 			return udev;
360 	}
361 
362 	return NULL;
363 }
364 
usb_get_dev_index(struct udevice * bus,int index)365 struct usb_device *usb_get_dev_index(struct udevice *bus, int index)
366 {
367 	struct udevice *dev;
368 	int devnum = index + 1; /* Addresses are allocated from 1 on USB */
369 
370 	device_find_first_child(bus, &dev);
371 	if (!dev)
372 		return NULL;
373 
374 	return find_child_devnum(dev, devnum);
375 }
376 #endif
377 
usb_setup_ehci_gadget(struct ehci_ctrl ** ctlrp)378 int usb_setup_ehci_gadget(struct ehci_ctrl **ctlrp)
379 {
380 	struct usb_platdata *plat;
381 	struct udevice *dev;
382 	int ret;
383 
384 	/* Find the old device and remove it */
385 	ret = uclass_find_device_by_seq(UCLASS_USB, 0, true, &dev);
386 	if (ret)
387 		return ret;
388 	ret = device_remove(dev, DM_REMOVE_NORMAL);
389 	if (ret)
390 		return ret;
391 
392 	plat = dev_get_platdata(dev);
393 	plat->init_type = USB_INIT_DEVICE;
394 	ret = device_probe(dev);
395 	if (ret)
396 		return ret;
397 	*ctlrp = dev_get_priv(dev);
398 
399 	return 0;
400 }
401 
402 /* returns 0 if no match, 1 if match */
usb_match_device(const struct usb_device_descriptor * desc,const struct usb_device_id * id)403 static int usb_match_device(const struct usb_device_descriptor *desc,
404 			    const struct usb_device_id *id)
405 {
406 	if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
407 	    id->idVendor != le16_to_cpu(desc->idVendor))
408 		return 0;
409 
410 	if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
411 	    id->idProduct != le16_to_cpu(desc->idProduct))
412 		return 0;
413 
414 	/* No need to test id->bcdDevice_lo != 0, since 0 is never
415 	   greater than any unsigned number. */
416 	if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
417 	    (id->bcdDevice_lo > le16_to_cpu(desc->bcdDevice)))
418 		return 0;
419 
420 	if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
421 	    (id->bcdDevice_hi < le16_to_cpu(desc->bcdDevice)))
422 		return 0;
423 
424 	if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
425 	    (id->bDeviceClass != desc->bDeviceClass))
426 		return 0;
427 
428 	if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
429 	    (id->bDeviceSubClass != desc->bDeviceSubClass))
430 		return 0;
431 
432 	if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
433 	    (id->bDeviceProtocol != desc->bDeviceProtocol))
434 		return 0;
435 
436 	return 1;
437 }
438 
439 /* returns 0 if no match, 1 if match */
usb_match_one_id_intf(const struct usb_device_descriptor * desc,const struct usb_interface_descriptor * int_desc,const struct usb_device_id * id)440 static int usb_match_one_id_intf(const struct usb_device_descriptor *desc,
441 			const struct usb_interface_descriptor *int_desc,
442 			const struct usb_device_id *id)
443 {
444 	/* The interface class, subclass, protocol and number should never be
445 	 * checked for a match if the device class is Vendor Specific,
446 	 * unless the match record specifies the Vendor ID. */
447 	if (desc->bDeviceClass == USB_CLASS_VENDOR_SPEC &&
448 	    !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
449 	    (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS |
450 				USB_DEVICE_ID_MATCH_INT_SUBCLASS |
451 				USB_DEVICE_ID_MATCH_INT_PROTOCOL |
452 				USB_DEVICE_ID_MATCH_INT_NUMBER)))
453 		return 0;
454 
455 	if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
456 	    (id->bInterfaceClass != int_desc->bInterfaceClass))
457 		return 0;
458 
459 	if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) &&
460 	    (id->bInterfaceSubClass != int_desc->bInterfaceSubClass))
461 		return 0;
462 
463 	if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) &&
464 	    (id->bInterfaceProtocol != int_desc->bInterfaceProtocol))
465 		return 0;
466 
467 	if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_NUMBER) &&
468 	    (id->bInterfaceNumber != int_desc->bInterfaceNumber))
469 		return 0;
470 
471 	return 1;
472 }
473 
474 /* returns 0 if no match, 1 if match */
usb_match_one_id(struct usb_device_descriptor * desc,struct usb_interface_descriptor * int_desc,const struct usb_device_id * id)475 static int usb_match_one_id(struct usb_device_descriptor *desc,
476 			    struct usb_interface_descriptor *int_desc,
477 			    const struct usb_device_id *id)
478 {
479 	if (!usb_match_device(desc, id))
480 		return 0;
481 
482 	return usb_match_one_id_intf(desc, int_desc, id);
483 }
484 
485 /**
486  * usb_find_and_bind_driver() - Find and bind the right USB driver
487  *
488  * This only looks at certain fields in the descriptor.
489  */
usb_find_and_bind_driver(struct udevice * parent,struct usb_device_descriptor * desc,struct usb_interface_descriptor * iface,int bus_seq,int devnum,struct udevice ** devp)490 static int usb_find_and_bind_driver(struct udevice *parent,
491 				    struct usb_device_descriptor *desc,
492 				    struct usb_interface_descriptor *iface,
493 				    int bus_seq, int devnum,
494 				    struct udevice **devp)
495 {
496 	struct usb_driver_entry *start, *entry;
497 	int n_ents;
498 	int ret;
499 	char name[30], *str;
500 
501 	*devp = NULL;
502 	debug("%s: Searching for driver\n", __func__);
503 	start = ll_entry_start(struct usb_driver_entry, usb_driver_entry);
504 	n_ents = ll_entry_count(struct usb_driver_entry, usb_driver_entry);
505 	for (entry = start; entry != start + n_ents; entry++) {
506 		const struct usb_device_id *id;
507 		struct udevice *dev;
508 		const struct driver *drv;
509 		struct usb_dev_platdata *plat;
510 
511 		for (id = entry->match; id->match_flags; id++) {
512 			if (!usb_match_one_id(desc, iface, id))
513 				continue;
514 
515 			drv = entry->driver;
516 			/*
517 			 * We could pass the descriptor to the driver as
518 			 * platdata (instead of NULL) and allow its bind()
519 			 * method to return -ENOENT if it doesn't support this
520 			 * device. That way we could continue the search to
521 			 * find another driver. For now this doesn't seem
522 			 * necesssary, so just bind the first match.
523 			 */
524 			ret = device_bind(parent, drv, drv->name, NULL, -1,
525 					  &dev);
526 			if (ret)
527 				goto error;
528 			debug("%s: Match found: %s\n", __func__, drv->name);
529 			dev->driver_data = id->driver_info;
530 			plat = dev_get_parent_platdata(dev);
531 			plat->id = *id;
532 			*devp = dev;
533 			return 0;
534 		}
535 	}
536 
537 	/* Bind a generic driver so that the device can be used */
538 	snprintf(name, sizeof(name), "generic_bus_%x_dev_%x", bus_seq, devnum);
539 	str = strdup(name);
540 	if (!str)
541 		return -ENOMEM;
542 	ret = device_bind_driver(parent, "usb_dev_generic_drv", str, devp);
543 
544 error:
545 	debug("%s: No match found: %d\n", __func__, ret);
546 	return ret;
547 }
548 
549 /**
550  * usb_find_child() - Find an existing device which matches our needs
551  *
552  *
553  */
usb_find_child(struct udevice * parent,struct usb_device_descriptor * desc,struct usb_interface_descriptor * iface,struct udevice ** devp)554 static int usb_find_child(struct udevice *parent,
555 			  struct usb_device_descriptor *desc,
556 			  struct usb_interface_descriptor *iface,
557 			  struct udevice **devp)
558 {
559 	struct udevice *dev;
560 
561 	*devp = NULL;
562 	for (device_find_first_child(parent, &dev);
563 	     dev;
564 	     device_find_next_child(&dev)) {
565 		struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
566 
567 		/* If this device is already in use, skip it */
568 		if (device_active(dev))
569 			continue;
570 		debug("   %s: name='%s', plat=%d, desc=%d\n", __func__,
571 		      dev->name, plat->id.bDeviceClass, desc->bDeviceClass);
572 		if (usb_match_one_id(desc, iface, &plat->id)) {
573 			*devp = dev;
574 			return 0;
575 		}
576 	}
577 
578 	return -ENOENT;
579 }
580 
usb_scan_device(struct udevice * parent,int port,enum usb_device_speed speed,struct udevice ** devp)581 int usb_scan_device(struct udevice *parent, int port,
582 		    enum usb_device_speed speed, struct udevice **devp)
583 {
584 	struct udevice *dev;
585 	bool created = false;
586 	struct usb_dev_platdata *plat;
587 	struct usb_bus_priv *priv;
588 	struct usb_device *parent_udev;
589 	int ret;
590 	ALLOC_CACHE_ALIGN_BUFFER(struct usb_device, udev, 1);
591 	struct usb_interface_descriptor *iface = &udev->config.if_desc[0].desc;
592 
593 	*devp = NULL;
594 	memset(udev, '\0', sizeof(*udev));
595 	udev->controller_dev = usb_get_bus(parent);
596 	priv = dev_get_uclass_priv(udev->controller_dev);
597 
598 	/*
599 	 * Somewhat nasty, this. We create a local device and use the normal
600 	 * USB stack to read its descriptor. Then we know what type of device
601 	 * to create for real.
602 	 *
603 	 * udev->dev is set to the parent, since we don't have a real device
604 	 * yet. The USB stack should not access udev.dev anyway, except perhaps
605 	 * to find the controller, and the controller will either be @parent,
606 	 * or some parent of @parent.
607 	 *
608 	 * Another option might be to create the device as a generic USB
609 	 * device, then morph it into the correct one when we know what it
610 	 * should be. This means that a generic USB device would morph into
611 	 * a network controller, or a USB flash stick, for example. However,
612 	 * we don't support such morphing and it isn't clear that it would
613 	 * be easy to do.
614 	 *
615 	 * Yet another option is to split out the USB stack parts of udev
616 	 * into something like a 'struct urb' (as Linux does) which can exist
617 	 * independently of any device. This feels cleaner, but calls for quite
618 	 * a big change to the USB stack.
619 	 *
620 	 * For now, the approach is to set up an empty udev, read its
621 	 * descriptor and assign it an address, then bind a real device and
622 	 * stash the resulting information into the device's parent
623 	 * platform data. Then when we probe it, usb_child_pre_probe() is called
624 	 * and it will pull the information out of the stash.
625 	 */
626 	udev->dev = parent;
627 	udev->speed = speed;
628 	udev->devnum = priv->next_addr + 1;
629 	udev->portnr = port;
630 	debug("Calling usb_setup_device(), portnr=%d\n", udev->portnr);
631 	parent_udev = device_get_uclass_id(parent) == UCLASS_USB_HUB ?
632 		dev_get_parent_priv(parent) : NULL;
633 	ret = usb_setup_device(udev, priv->desc_before_addr, parent_udev);
634 	debug("read_descriptor for '%s': ret=%d\n", parent->name, ret);
635 	if (ret)
636 		return ret;
637 	ret = usb_find_child(parent, &udev->descriptor, iface, &dev);
638 	debug("** usb_find_child returns %d\n", ret);
639 	if (ret) {
640 		if (ret != -ENOENT)
641 			return ret;
642 		ret = usb_find_and_bind_driver(parent, &udev->descriptor, iface,
643 					       udev->controller_dev->seq,
644 					       udev->devnum, &dev);
645 		if (ret)
646 			return ret;
647 		created = true;
648 	}
649 	plat = dev_get_parent_platdata(dev);
650 	debug("%s: Probing '%s', plat=%p\n", __func__, dev->name, plat);
651 	plat->devnum = udev->devnum;
652 	plat->udev = udev;
653 	priv->next_addr++;
654 	ret = device_probe(dev);
655 	if (ret) {
656 		debug("%s: Device '%s' probe failed\n", __func__, dev->name);
657 		priv->next_addr--;
658 		if (created)
659 			device_unbind(dev);
660 		return ret;
661 	}
662 	*devp = dev;
663 
664 	return 0;
665 }
666 
667 /*
668  * Detect if a USB device has been plugged or unplugged.
669  */
usb_detect_change(void)670 int usb_detect_change(void)
671 {
672 	struct udevice *hub;
673 	struct uclass *uc;
674 	int change = 0;
675 	int ret;
676 
677 	ret = uclass_get(UCLASS_USB_HUB, &uc);
678 	if (ret)
679 		return ret;
680 
681 	uclass_foreach_dev(hub, uc) {
682 		struct usb_device *udev;
683 		struct udevice *dev;
684 
685 		if (!device_active(hub))
686 			continue;
687 		for (device_find_first_child(hub, &dev);
688 		     dev;
689 		     device_find_next_child(&dev)) {
690 			struct usb_port_status status;
691 
692 			if (!device_active(dev))
693 				continue;
694 
695 			udev = dev_get_parent_priv(dev);
696 			if (usb_get_port_status(udev, udev->portnr, &status)
697 					< 0)
698 				/* USB request failed */
699 				continue;
700 
701 			if (le16_to_cpu(status.wPortChange) &
702 			    USB_PORT_STAT_C_CONNECTION)
703 				change++;
704 		}
705 	}
706 
707 	return change;
708 }
709 
usb_child_post_bind(struct udevice * dev)710 static int usb_child_post_bind(struct udevice *dev)
711 {
712 	struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
713 	int val;
714 
715 	if (!dev_of_valid(dev))
716 		return 0;
717 
718 	/* We only support matching a few things */
719 	val = dev_read_u32_default(dev, "usb,device-class", -1);
720 	if (val != -1) {
721 		plat->id.match_flags |= USB_DEVICE_ID_MATCH_DEV_CLASS;
722 		plat->id.bDeviceClass = val;
723 	}
724 	val = dev_read_u32_default(dev, "usb,interface-class", -1);
725 	if (val != -1) {
726 		plat->id.match_flags |= USB_DEVICE_ID_MATCH_INT_CLASS;
727 		plat->id.bInterfaceClass = val;
728 	}
729 
730 	return 0;
731 }
732 
usb_get_bus(struct udevice * dev)733 struct udevice *usb_get_bus(struct udevice *dev)
734 {
735 	struct udevice *bus;
736 
737 	for (bus = dev; bus && device_get_uclass_id(bus) != UCLASS_USB; )
738 		bus = bus->parent;
739 	if (!bus) {
740 		/* By design this cannot happen */
741 		assert(bus);
742 		debug("USB HUB '%s' does not have a controller\n", dev->name);
743 	}
744 
745 	return bus;
746 }
747 
usb_child_pre_probe(struct udevice * dev)748 int usb_child_pre_probe(struct udevice *dev)
749 {
750 	struct usb_device *udev = dev_get_parent_priv(dev);
751 	struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
752 	int ret;
753 
754 	if (plat->udev) {
755 		/*
756 		 * Copy over all the values set in the on stack struct
757 		 * usb_device in usb_scan_device() to our final struct
758 		 * usb_device for this dev.
759 		 */
760 		*udev = *(plat->udev);
761 		/* And clear plat->udev as it will not be valid for long */
762 		plat->udev = NULL;
763 		udev->dev = dev;
764 	} else {
765 		/*
766 		 * This happens with devices which are explicitly bound
767 		 * instead of being discovered through usb_scan_device()
768 		 * such as sandbox emul devices.
769 		 */
770 		udev->dev = dev;
771 		udev->controller_dev = usb_get_bus(dev);
772 		udev->devnum = plat->devnum;
773 
774 		/*
775 		 * udev did not go through usb_scan_device(), so we need to
776 		 * select the config and read the config descriptors.
777 		 */
778 		ret = usb_select_config(udev);
779 		if (ret)
780 			return ret;
781 	}
782 
783 	return 0;
784 }
785 
786 UCLASS_DRIVER(usb) = {
787 	.id		= UCLASS_USB,
788 	.name		= "usb",
789 	.flags		= DM_UC_FLAG_SEQ_ALIAS,
790 	.post_bind	= dm_scan_fdt_dev,
791 	.priv_auto_alloc_size = sizeof(struct usb_uclass_priv),
792 	.per_child_auto_alloc_size = sizeof(struct usb_device),
793 	.per_device_auto_alloc_size = sizeof(struct usb_bus_priv),
794 	.child_post_bind = usb_child_post_bind,
795 	.child_pre_probe = usb_child_pre_probe,
796 	.per_child_platdata_auto_alloc_size = sizeof(struct usb_dev_platdata),
797 };
798 
799 UCLASS_DRIVER(usb_dev_generic) = {
800 	.id		= UCLASS_USB_DEV_GENERIC,
801 	.name		= "usb_dev_generic",
802 };
803 
804 U_BOOT_DRIVER(usb_dev_generic_drv) = {
805 	.id		= UCLASS_USB_DEV_GENERIC,
806 	.name		= "usb_dev_generic_drv",
807 };
808