1 // SPDX-License-Identifier: GPL-2.0
3 * udc.c - Core UDC Framework
5 * Copyright (C) 2010 Texas Instruments
6 * Author: Felipe Balbi <balbi@ti.com>
9 #define pr_fmt(fmt) "UDC core: " fmt
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/device.h>
14 #include <linux/list.h>
15 #include <linux/idr.h>
16 #include <linux/err.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/sched/task_stack.h>
19 #include <linux/workqueue.h>
21 #include <linux/usb/ch9.h>
22 #include <linux/usb/gadget.h>
23 #include <linux/usb.h>
27 static DEFINE_IDA(gadget_id_numbers);
29 static struct bus_type gadget_bus_type;
32 * struct usb_udc - describes one usb device controller
33 * @driver: the gadget driver pointer. For use by the class code
34 * @dev: the child device to the actual controller
35 * @gadget: the gadget. For use by the class code
36 * @list: for use by the udc class driver
37 * @vbus: for udcs who care about vbus status, this value is real vbus status;
38 * for udcs who do not care about vbus status, this value is always true
39 * @started: the UDC's started state. True if the UDC had started.
41 * This represents the internal data structure which is used by the UDC-class
42 * to hold information about udc driver and gadget together.
45 struct usb_gadget_driver *driver;
46 struct usb_gadget *gadget;
48 struct list_head list;
53 static struct class *udc_class;
54 static LIST_HEAD(udc_list);
56 /* Protects udc_list, udc->driver, driver->is_bound, and related calls */
57 static DEFINE_MUTEX(udc_lock);
59 /* ------------------------------------------------------------------------- */
62 * usb_ep_set_maxpacket_limit - set maximum packet size limit for endpoint
63 * @ep:the endpoint being configured
64 * @maxpacket_limit:value of maximum packet size limit
66 * This function should be used only in UDC drivers to initialize endpoint
67 * (usually in probe function).
69 void usb_ep_set_maxpacket_limit(struct usb_ep *ep,
70 unsigned maxpacket_limit)
72 ep->maxpacket_limit = maxpacket_limit;
73 ep->maxpacket = maxpacket_limit;
75 trace_usb_ep_set_maxpacket_limit(ep, 0);
77 EXPORT_SYMBOL_GPL(usb_ep_set_maxpacket_limit);
80 * usb_ep_enable - configure endpoint, making it usable
81 * @ep:the endpoint being configured. may not be the endpoint named "ep0".
82 * drivers discover endpoints through the ep_list of a usb_gadget.
84 * When configurations are set, or when interface settings change, the driver
85 * will enable or disable the relevant endpoints. while it is enabled, an
86 * endpoint may be used for i/o until the driver receives a disconnect() from
87 * the host or until the endpoint is disabled.
89 * the ep0 implementation (which calls this routine) must ensure that the
90 * hardware capabilities of each endpoint match the descriptor provided
91 * for it. for example, an endpoint named "ep2in-bulk" would be usable
92 * for interrupt transfers as well as bulk, but it likely couldn't be used
93 * for iso transfers or for endpoint 14. some endpoints are fully
94 * configurable, with more generic names like "ep-a". (remember that for
95 * USB, "in" means "towards the USB host".)
97 * This routine may be called in an atomic (interrupt) context.
99 * returns zero, or a negative error code.
101 int usb_ep_enable(struct usb_ep *ep)
108 /* UDC drivers can't handle endpoints with maxpacket size 0 */
109 if (usb_endpoint_maxp(ep->desc) == 0) {
111 * We should log an error message here, but we can't call
112 * dev_err() because there's no way to find the gadget
119 ret = ep->ops->enable(ep, ep->desc);
126 trace_usb_ep_enable(ep, ret);
130 EXPORT_SYMBOL_GPL(usb_ep_enable);
133 * usb_ep_disable - endpoint is no longer usable
134 * @ep:the endpoint being unconfigured. may not be the endpoint named "ep0".
136 * no other task may be using this endpoint when this is called.
137 * any pending and uncompleted requests will complete with status
138 * indicating disconnect (-ESHUTDOWN) before this call returns.
139 * gadget drivers must call usb_ep_enable() again before queueing
140 * requests to the endpoint.
142 * This routine may be called in an atomic (interrupt) context.
144 * returns zero, or a negative error code.
146 int usb_ep_disable(struct usb_ep *ep)
153 ret = ep->ops->disable(ep);
160 trace_usb_ep_disable(ep, ret);
164 EXPORT_SYMBOL_GPL(usb_ep_disable);
167 * usb_ep_alloc_request - allocate a request object to use with this endpoint
168 * @ep:the endpoint to be used with with the request
169 * @gfp_flags:GFP_* flags to use
171 * Request objects must be allocated with this call, since they normally
172 * need controller-specific setup and may even need endpoint-specific
173 * resources such as allocation of DMA descriptors.
174 * Requests may be submitted with usb_ep_queue(), and receive a single
175 * completion callback. Free requests with usb_ep_free_request(), when
176 * they are no longer needed.
178 * Returns the request, or null if one could not be allocated.
180 struct usb_request *usb_ep_alloc_request(struct usb_ep *ep,
183 struct usb_request *req = NULL;
185 req = ep->ops->alloc_request(ep, gfp_flags);
187 trace_usb_ep_alloc_request(ep, req, req ? 0 : -ENOMEM);
191 EXPORT_SYMBOL_GPL(usb_ep_alloc_request);
194 * usb_ep_free_request - frees a request object
195 * @ep:the endpoint associated with the request
196 * @req:the request being freed
198 * Reverses the effect of usb_ep_alloc_request().
199 * Caller guarantees the request is not queued, and that it will
200 * no longer be requeued (or otherwise used).
202 void usb_ep_free_request(struct usb_ep *ep,
203 struct usb_request *req)
205 trace_usb_ep_free_request(ep, req, 0);
206 ep->ops->free_request(ep, req);
208 EXPORT_SYMBOL_GPL(usb_ep_free_request);
211 * usb_ep_queue - queues (submits) an I/O request to an endpoint.
212 * @ep:the endpoint associated with the request
213 * @req:the request being submitted
214 * @gfp_flags: GFP_* flags to use in case the lower level driver couldn't
215 * pre-allocate all necessary memory with the request.
217 * This tells the device controller to perform the specified request through
218 * that endpoint (reading or writing a buffer). When the request completes,
219 * including being canceled by usb_ep_dequeue(), the request's completion
220 * routine is called to return the request to the driver. Any endpoint
221 * (except control endpoints like ep0) may have more than one transfer
222 * request queued; they complete in FIFO order. Once a gadget driver
223 * submits a request, that request may not be examined or modified until it
224 * is given back to that driver through the completion callback.
226 * Each request is turned into one or more packets. The controller driver
227 * never merges adjacent requests into the same packet. OUT transfers
228 * will sometimes use data that's already buffered in the hardware.
229 * Drivers can rely on the fact that the first byte of the request's buffer
230 * always corresponds to the first byte of some USB packet, for both
231 * IN and OUT transfers.
233 * Bulk endpoints can queue any amount of data; the transfer is packetized
234 * automatically. The last packet will be short if the request doesn't fill it
235 * out completely. Zero length packets (ZLPs) should be avoided in portable
236 * protocols since not all usb hardware can successfully handle zero length
237 * packets. (ZLPs may be explicitly written, and may be implicitly written if
238 * the request 'zero' flag is set.) Bulk endpoints may also be used
239 * for interrupt transfers; but the reverse is not true, and some endpoints
240 * won't support every interrupt transfer. (Such as 768 byte packets.)
242 * Interrupt-only endpoints are less functional than bulk endpoints, for
243 * example by not supporting queueing or not handling buffers that are
244 * larger than the endpoint's maxpacket size. They may also treat data
245 * toggle differently.
247 * Control endpoints ... after getting a setup() callback, the driver queues
248 * one response (even if it would be zero length). That enables the
249 * status ack, after transferring data as specified in the response. Setup
250 * functions may return negative error codes to generate protocol stalls.
251 * (Note that some USB device controllers disallow protocol stall responses
252 * in some cases.) When control responses are deferred (the response is
253 * written after the setup callback returns), then usb_ep_set_halt() may be
254 * used on ep0 to trigger protocol stalls. Depending on the controller,
255 * it may not be possible to trigger a status-stage protocol stall when the
256 * data stage is over, that is, from within the response's completion
259 * For periodic endpoints, like interrupt or isochronous ones, the usb host
260 * arranges to poll once per interval, and the gadget driver usually will
261 * have queued some data to transfer at that time.
263 * Note that @req's ->complete() callback must never be called from
264 * within usb_ep_queue() as that can create deadlock situations.
266 * This routine may be called in interrupt context.
268 * Returns zero, or a negative error code. Endpoints that are not enabled
269 * report errors; errors will also be
270 * reported when the usb peripheral is disconnected.
272 * If and only if @req is successfully queued (the return value is zero),
273 * @req->complete() will be called exactly once, when the Gadget core and
274 * UDC are finished with the request. When the completion function is called,
275 * control of the request is returned to the device driver which submitted it.
276 * The completion handler may then immediately free or reuse @req.
278 int usb_ep_queue(struct usb_ep *ep,
279 struct usb_request *req, gfp_t gfp_flags)
283 if (WARN_ON_ONCE(!ep->enabled && ep->address)) {
288 ret = ep->ops->queue(ep, req, gfp_flags);
291 trace_usb_ep_queue(ep, req, ret);
295 EXPORT_SYMBOL_GPL(usb_ep_queue);
298 * usb_ep_dequeue - dequeues (cancels, unlinks) an I/O request from an endpoint
299 * @ep:the endpoint associated with the request
300 * @req:the request being canceled
302 * If the request is still active on the endpoint, it is dequeued and
303 * eventually its completion routine is called (with status -ECONNRESET);
304 * else a negative error code is returned. This routine is asynchronous,
305 * that is, it may return before the completion routine runs.
307 * Note that some hardware can't clear out write fifos (to unlink the request
308 * at the head of the queue) except as part of disconnecting from usb. Such
309 * restrictions prevent drivers from supporting configuration changes,
310 * even to configuration zero (a "chapter 9" requirement).
312 * This routine may be called in interrupt context.
314 int usb_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
318 ret = ep->ops->dequeue(ep, req);
319 trace_usb_ep_dequeue(ep, req, ret);
323 EXPORT_SYMBOL_GPL(usb_ep_dequeue);
326 * usb_ep_set_halt - sets the endpoint halt feature.
327 * @ep: the non-isochronous endpoint being stalled
329 * Use this to stall an endpoint, perhaps as an error report.
330 * Except for control endpoints,
331 * the endpoint stays halted (will not stream any data) until the host
332 * clears this feature; drivers may need to empty the endpoint's request
333 * queue first, to make sure no inappropriate transfers happen.
335 * Note that while an endpoint CLEAR_FEATURE will be invisible to the
336 * gadget driver, a SET_INTERFACE will not be. To reset endpoints for the
337 * current altsetting, see usb_ep_clear_halt(). When switching altsettings,
338 * it's simplest to use usb_ep_enable() or usb_ep_disable() for the endpoints.
340 * This routine may be called in interrupt context.
342 * Returns zero, or a negative error code. On success, this call sets
343 * underlying hardware state that blocks data transfers.
344 * Attempts to halt IN endpoints will fail (returning -EAGAIN) if any
345 * transfer requests are still queued, or if the controller hardware
346 * (usually a FIFO) still holds bytes that the host hasn't collected.
348 int usb_ep_set_halt(struct usb_ep *ep)
352 ret = ep->ops->set_halt(ep, 1);
353 trace_usb_ep_set_halt(ep, ret);
357 EXPORT_SYMBOL_GPL(usb_ep_set_halt);
360 * usb_ep_clear_halt - clears endpoint halt, and resets toggle
361 * @ep:the bulk or interrupt endpoint being reset
363 * Use this when responding to the standard usb "set interface" request,
364 * for endpoints that aren't reconfigured, after clearing any other state
365 * in the endpoint's i/o queue.
367 * This routine may be called in interrupt context.
369 * Returns zero, or a negative error code. On success, this call clears
370 * the underlying hardware state reflecting endpoint halt and data toggle.
371 * Note that some hardware can't support this request (like pxa2xx_udc),
372 * and accordingly can't correctly implement interface altsettings.
374 int usb_ep_clear_halt(struct usb_ep *ep)
378 ret = ep->ops->set_halt(ep, 0);
379 trace_usb_ep_clear_halt(ep, ret);
383 EXPORT_SYMBOL_GPL(usb_ep_clear_halt);
386 * usb_ep_set_wedge - sets the halt feature and ignores clear requests
387 * @ep: the endpoint being wedged
389 * Use this to stall an endpoint and ignore CLEAR_FEATURE(HALT_ENDPOINT)
390 * requests. If the gadget driver clears the halt status, it will
391 * automatically unwedge the endpoint.
393 * This routine may be called in interrupt context.
395 * Returns zero on success, else negative errno.
397 int usb_ep_set_wedge(struct usb_ep *ep)
401 if (ep->ops->set_wedge)
402 ret = ep->ops->set_wedge(ep);
404 ret = ep->ops->set_halt(ep, 1);
406 trace_usb_ep_set_wedge(ep, ret);
410 EXPORT_SYMBOL_GPL(usb_ep_set_wedge);
413 * usb_ep_fifo_status - returns number of bytes in fifo, or error
414 * @ep: the endpoint whose fifo status is being checked.
416 * FIFO endpoints may have "unclaimed data" in them in certain cases,
417 * such as after aborted transfers. Hosts may not have collected all
418 * the IN data written by the gadget driver (and reported by a request
419 * completion). The gadget driver may not have collected all the data
420 * written OUT to it by the host. Drivers that need precise handling for
421 * fault reporting or recovery may need to use this call.
423 * This routine may be called in interrupt context.
425 * This returns the number of such bytes in the fifo, or a negative
426 * errno if the endpoint doesn't use a FIFO or doesn't support such
429 int usb_ep_fifo_status(struct usb_ep *ep)
433 if (ep->ops->fifo_status)
434 ret = ep->ops->fifo_status(ep);
438 trace_usb_ep_fifo_status(ep, ret);
442 EXPORT_SYMBOL_GPL(usb_ep_fifo_status);
445 * usb_ep_fifo_flush - flushes contents of a fifo
446 * @ep: the endpoint whose fifo is being flushed.
448 * This call may be used to flush the "unclaimed data" that may exist in
449 * an endpoint fifo after abnormal transaction terminations. The call
450 * must never be used except when endpoint is not being used for any
451 * protocol translation.
453 * This routine may be called in interrupt context.
455 void usb_ep_fifo_flush(struct usb_ep *ep)
457 if (ep->ops->fifo_flush)
458 ep->ops->fifo_flush(ep);
460 trace_usb_ep_fifo_flush(ep, 0);
462 EXPORT_SYMBOL_GPL(usb_ep_fifo_flush);
464 /* ------------------------------------------------------------------------- */
467 * usb_gadget_frame_number - returns the current frame number
468 * @gadget: controller that reports the frame number
470 * Returns the usb frame number, normally eleven bits from a SOF packet,
471 * or negative errno if this device doesn't support this capability.
473 int usb_gadget_frame_number(struct usb_gadget *gadget)
477 ret = gadget->ops->get_frame(gadget);
479 trace_usb_gadget_frame_number(gadget, ret);
483 EXPORT_SYMBOL_GPL(usb_gadget_frame_number);
486 * usb_gadget_wakeup - tries to wake up the host connected to this gadget
487 * @gadget: controller used to wake up the host
489 * Returns zero on success, else negative error code if the hardware
490 * doesn't support such attempts, or its support has not been enabled
491 * by the usb host. Drivers must return device descriptors that report
492 * their ability to support this, or hosts won't enable it.
494 * This may also try to use SRP to wake the host and start enumeration,
495 * even if OTG isn't otherwise in use. OTG devices may also start
496 * remote wakeup even when hosts don't explicitly enable it.
498 int usb_gadget_wakeup(struct usb_gadget *gadget)
502 if (!gadget->ops->wakeup) {
507 ret = gadget->ops->wakeup(gadget);
510 trace_usb_gadget_wakeup(gadget, ret);
514 EXPORT_SYMBOL_GPL(usb_gadget_wakeup);
517 * usb_gadget_set_selfpowered - sets the device selfpowered feature.
518 * @gadget:the device being declared as self-powered
520 * this affects the device status reported by the hardware driver
521 * to reflect that it now has a local power supply.
523 * returns zero on success, else negative errno.
525 int usb_gadget_set_selfpowered(struct usb_gadget *gadget)
529 if (!gadget->ops->set_selfpowered) {
534 ret = gadget->ops->set_selfpowered(gadget, 1);
537 trace_usb_gadget_set_selfpowered(gadget, ret);
541 EXPORT_SYMBOL_GPL(usb_gadget_set_selfpowered);
544 * usb_gadget_clear_selfpowered - clear the device selfpowered feature.
545 * @gadget:the device being declared as bus-powered
547 * this affects the device status reported by the hardware driver.
548 * some hardware may not support bus-powered operation, in which
549 * case this feature's value can never change.
551 * returns zero on success, else negative errno.
553 int usb_gadget_clear_selfpowered(struct usb_gadget *gadget)
557 if (!gadget->ops->set_selfpowered) {
562 ret = gadget->ops->set_selfpowered(gadget, 0);
565 trace_usb_gadget_clear_selfpowered(gadget, ret);
569 EXPORT_SYMBOL_GPL(usb_gadget_clear_selfpowered);
572 * usb_gadget_vbus_connect - Notify controller that VBUS is powered
573 * @gadget:The device which now has VBUS power.
576 * This call is used by a driver for an external transceiver (or GPIO)
577 * that detects a VBUS power session starting. Common responses include
578 * resuming the controller, activating the D+ (or D-) pullup to let the
579 * host detect that a USB device is attached, and starting to draw power
580 * (8mA or possibly more, especially after SET_CONFIGURATION).
582 * Returns zero on success, else negative errno.
584 int usb_gadget_vbus_connect(struct usb_gadget *gadget)
588 if (!gadget->ops->vbus_session) {
593 ret = gadget->ops->vbus_session(gadget, 1);
596 trace_usb_gadget_vbus_connect(gadget, ret);
600 EXPORT_SYMBOL_GPL(usb_gadget_vbus_connect);
603 * usb_gadget_vbus_draw - constrain controller's VBUS power usage
604 * @gadget:The device whose VBUS usage is being described
605 * @mA:How much current to draw, in milliAmperes. This should be twice
606 * the value listed in the configuration descriptor bMaxPower field.
608 * This call is used by gadget drivers during SET_CONFIGURATION calls,
609 * reporting how much power the device may consume. For example, this
610 * could affect how quickly batteries are recharged.
612 * Returns zero on success, else negative errno.
614 int usb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA)
618 if (!gadget->ops->vbus_draw) {
623 ret = gadget->ops->vbus_draw(gadget, mA);
628 trace_usb_gadget_vbus_draw(gadget, ret);
632 EXPORT_SYMBOL_GPL(usb_gadget_vbus_draw);
635 * usb_gadget_vbus_disconnect - notify controller about VBUS session end
636 * @gadget:the device whose VBUS supply is being described
639 * This call is used by a driver for an external transceiver (or GPIO)
640 * that detects a VBUS power session ending. Common responses include
641 * reversing everything done in usb_gadget_vbus_connect().
643 * Returns zero on success, else negative errno.
645 int usb_gadget_vbus_disconnect(struct usb_gadget *gadget)
649 if (!gadget->ops->vbus_session) {
654 ret = gadget->ops->vbus_session(gadget, 0);
657 trace_usb_gadget_vbus_disconnect(gadget, ret);
661 EXPORT_SYMBOL_GPL(usb_gadget_vbus_disconnect);
664 * usb_gadget_connect - software-controlled connect to USB host
665 * @gadget:the peripheral being connected
667 * Enables the D+ (or potentially D-) pullup. The host will start
668 * enumerating this gadget when the pullup is active and a VBUS session
669 * is active (the link is powered).
671 * Returns zero on success, else negative errno.
673 int usb_gadget_connect(struct usb_gadget *gadget)
677 if (!gadget->ops->pullup) {
682 if (gadget->deactivated) {
684 * If gadget is deactivated we only save new state.
685 * Gadget will be connected automatically after activation.
687 gadget->connected = true;
691 ret = gadget->ops->pullup(gadget, 1);
693 gadget->connected = 1;
696 trace_usb_gadget_connect(gadget, ret);
700 EXPORT_SYMBOL_GPL(usb_gadget_connect);
703 * usb_gadget_disconnect - software-controlled disconnect from USB host
704 * @gadget:the peripheral being disconnected
706 * Disables the D+ (or potentially D-) pullup, which the host may see
707 * as a disconnect (when a VBUS session is active). Not all systems
708 * support software pullup controls.
710 * Following a successful disconnect, invoke the ->disconnect() callback
711 * for the current gadget driver so that UDC drivers don't need to.
713 * Returns zero on success, else negative errno.
715 int usb_gadget_disconnect(struct usb_gadget *gadget)
719 if (!gadget->ops->pullup) {
724 if (!gadget->connected)
727 if (gadget->deactivated) {
729 * If gadget is deactivated we only save new state.
730 * Gadget will stay disconnected after activation.
732 gadget->connected = false;
736 ret = gadget->ops->pullup(gadget, 0);
738 gadget->connected = 0;
739 gadget->udc->driver->disconnect(gadget);
743 trace_usb_gadget_disconnect(gadget, ret);
747 EXPORT_SYMBOL_GPL(usb_gadget_disconnect);
750 * usb_gadget_deactivate - deactivate function which is not ready to work
751 * @gadget: the peripheral being deactivated
753 * This routine may be used during the gadget driver bind() call to prevent
754 * the peripheral from ever being visible to the USB host, unless later
755 * usb_gadget_activate() is called. For example, user mode components may
756 * need to be activated before the system can talk to hosts.
758 * Returns zero on success, else negative errno.
760 int usb_gadget_deactivate(struct usb_gadget *gadget)
764 if (gadget->deactivated)
767 if (gadget->connected) {
768 ret = usb_gadget_disconnect(gadget);
773 * If gadget was being connected before deactivation, we want
774 * to reconnect it in usb_gadget_activate().
776 gadget->connected = true;
778 gadget->deactivated = true;
781 trace_usb_gadget_deactivate(gadget, ret);
785 EXPORT_SYMBOL_GPL(usb_gadget_deactivate);
788 * usb_gadget_activate - activate function which is not ready to work
789 * @gadget: the peripheral being activated
791 * This routine activates gadget which was previously deactivated with
792 * usb_gadget_deactivate() call. It calls usb_gadget_connect() if needed.
794 * Returns zero on success, else negative errno.
796 int usb_gadget_activate(struct usb_gadget *gadget)
800 if (!gadget->deactivated)
803 gadget->deactivated = false;
806 * If gadget has been connected before deactivation, or became connected
807 * while it was being deactivated, we call usb_gadget_connect().
809 if (gadget->connected)
810 ret = usb_gadget_connect(gadget);
813 trace_usb_gadget_activate(gadget, ret);
817 EXPORT_SYMBOL_GPL(usb_gadget_activate);
819 /* ------------------------------------------------------------------------- */
821 #ifdef CONFIG_HAS_DMA
823 int usb_gadget_map_request_by_dev(struct device *dev,
824 struct usb_request *req, int is_in)
826 if (req->length == 0)
832 mapped = dma_map_sg(dev, req->sg, req->num_sgs,
833 is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
835 dev_err(dev, "failed to map SGs\n");
839 req->num_mapped_sgs = mapped;
841 if (is_vmalloc_addr(req->buf)) {
842 dev_err(dev, "buffer is not dma capable\n");
844 } else if (object_is_on_stack(req->buf)) {
845 dev_err(dev, "buffer is on stack\n");
849 req->dma = dma_map_single(dev, req->buf, req->length,
850 is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
852 if (dma_mapping_error(dev, req->dma)) {
853 dev_err(dev, "failed to map buffer\n");
862 EXPORT_SYMBOL_GPL(usb_gadget_map_request_by_dev);
864 int usb_gadget_map_request(struct usb_gadget *gadget,
865 struct usb_request *req, int is_in)
867 return usb_gadget_map_request_by_dev(gadget->dev.parent, req, is_in);
869 EXPORT_SYMBOL_GPL(usb_gadget_map_request);
871 void usb_gadget_unmap_request_by_dev(struct device *dev,
872 struct usb_request *req, int is_in)
874 if (req->length == 0)
877 if (req->num_mapped_sgs) {
878 dma_unmap_sg(dev, req->sg, req->num_sgs,
879 is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
881 req->num_mapped_sgs = 0;
882 } else if (req->dma_mapped) {
883 dma_unmap_single(dev, req->dma, req->length,
884 is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
888 EXPORT_SYMBOL_GPL(usb_gadget_unmap_request_by_dev);
890 void usb_gadget_unmap_request(struct usb_gadget *gadget,
891 struct usb_request *req, int is_in)
893 usb_gadget_unmap_request_by_dev(gadget->dev.parent, req, is_in);
895 EXPORT_SYMBOL_GPL(usb_gadget_unmap_request);
897 #endif /* CONFIG_HAS_DMA */
899 /* ------------------------------------------------------------------------- */
902 * usb_gadget_giveback_request - give the request back to the gadget layer
903 * @ep: the endpoint to be used with with the request
904 * @req: the request being given back
906 * This is called by device controller drivers in order to return the
907 * completed request back to the gadget layer.
909 void usb_gadget_giveback_request(struct usb_ep *ep,
910 struct usb_request *req)
912 if (likely(req->status == 0))
913 usb_led_activity(USB_LED_EVENT_GADGET);
915 trace_usb_gadget_giveback_request(ep, req, 0);
917 req->complete(ep, req);
919 EXPORT_SYMBOL_GPL(usb_gadget_giveback_request);
921 /* ------------------------------------------------------------------------- */
924 * gadget_find_ep_by_name - returns ep whose name is the same as sting passed
925 * in second parameter or NULL if searched endpoint not found
926 * @g: controller to check for quirk
927 * @name: name of searched endpoint
929 struct usb_ep *gadget_find_ep_by_name(struct usb_gadget *g, const char *name)
933 gadget_for_each_ep(ep, g) {
934 if (!strcmp(ep->name, name))
940 EXPORT_SYMBOL_GPL(gadget_find_ep_by_name);
942 /* ------------------------------------------------------------------------- */
944 int usb_gadget_ep_match_desc(struct usb_gadget *gadget,
945 struct usb_ep *ep, struct usb_endpoint_descriptor *desc,
946 struct usb_ss_ep_comp_descriptor *ep_comp)
950 int num_req_streams = 0;
952 /* endpoint already claimed? */
956 type = usb_endpoint_type(desc);
957 max = usb_endpoint_maxp(desc);
959 if (usb_endpoint_dir_in(desc) && !ep->caps.dir_in)
961 if (usb_endpoint_dir_out(desc) && !ep->caps.dir_out)
964 if (max > ep->maxpacket_limit)
967 /* "high bandwidth" works only at high speed */
968 if (!gadget_is_dualspeed(gadget) && usb_endpoint_maxp_mult(desc) > 1)
972 case USB_ENDPOINT_XFER_CONTROL:
973 /* only support ep0 for portable CONTROL traffic */
975 case USB_ENDPOINT_XFER_ISOC:
976 if (!ep->caps.type_iso)
978 /* ISO: limit 1023 bytes full speed, 1024 high/super speed */
979 if (!gadget_is_dualspeed(gadget) && max > 1023)
982 case USB_ENDPOINT_XFER_BULK:
983 if (!ep->caps.type_bulk)
985 if (ep_comp && gadget_is_superspeed(gadget)) {
986 /* Get the number of required streams from the
987 * EP companion descriptor and see if the EP
990 num_req_streams = ep_comp->bmAttributes & 0x1f;
991 if (num_req_streams > ep->max_streams)
995 case USB_ENDPOINT_XFER_INT:
996 /* Bulk endpoints handle interrupt transfers,
997 * except the toggle-quirky iso-synch kind
999 if (!ep->caps.type_int && !ep->caps.type_bulk)
1001 /* INT: limit 64 bytes full speed, 1024 high/super speed */
1002 if (!gadget_is_dualspeed(gadget) && max > 64)
1009 EXPORT_SYMBOL_GPL(usb_gadget_ep_match_desc);
1012 * usb_gadget_check_config - checks if the UDC can support the binded
1014 * @gadget: controller to check the USB configuration
1016 * Ensure that a UDC is able to support the requested resources by a
1017 * configuration, and that there are no resource limitations, such as
1018 * internal memory allocated to all requested endpoints.
1020 * Returns zero on success, else a negative errno.
1022 int usb_gadget_check_config(struct usb_gadget *gadget)
1024 if (gadget->ops->check_config)
1025 return gadget->ops->check_config(gadget);
1028 EXPORT_SYMBOL_GPL(usb_gadget_check_config);
1030 /* ------------------------------------------------------------------------- */
1032 static void usb_gadget_state_work(struct work_struct *work)
1034 struct usb_gadget *gadget = work_to_gadget(work);
1035 struct usb_udc *udc = gadget->udc;
1038 sysfs_notify(&udc->dev.kobj, NULL, "state");
1041 void usb_gadget_set_state(struct usb_gadget *gadget,
1042 enum usb_device_state state)
1044 gadget->state = state;
1045 schedule_work(&gadget->work);
1047 EXPORT_SYMBOL_GPL(usb_gadget_set_state);
1049 /* ------------------------------------------------------------------------- */
1051 static void usb_udc_connect_control(struct usb_udc *udc)
1054 usb_gadget_connect(udc->gadget);
1056 usb_gadget_disconnect(udc->gadget);
1060 * usb_udc_vbus_handler - updates the udc core vbus status, and try to
1061 * connect or disconnect gadget
1062 * @gadget: The gadget which vbus change occurs
1063 * @status: The vbus status
1065 * The udc driver calls it when it wants to connect or disconnect gadget
1066 * according to vbus status.
1068 void usb_udc_vbus_handler(struct usb_gadget *gadget, bool status)
1070 struct usb_udc *udc = gadget->udc;
1074 usb_udc_connect_control(udc);
1077 EXPORT_SYMBOL_GPL(usb_udc_vbus_handler);
1080 * usb_gadget_udc_reset - notifies the udc core that bus reset occurs
1081 * @gadget: The gadget which bus reset occurs
1082 * @driver: The gadget driver we want to notify
1084 * If the udc driver has bus reset handler, it needs to call this when the bus
1085 * reset occurs, it notifies the gadget driver that the bus reset occurs as
1086 * well as updates gadget state.
1088 void usb_gadget_udc_reset(struct usb_gadget *gadget,
1089 struct usb_gadget_driver *driver)
1091 driver->reset(gadget);
1092 usb_gadget_set_state(gadget, USB_STATE_DEFAULT);
1094 EXPORT_SYMBOL_GPL(usb_gadget_udc_reset);
1097 * usb_gadget_udc_start - tells usb device controller to start up
1098 * @udc: The UDC to be started
1100 * This call is issued by the UDC Class driver when it's about
1101 * to register a gadget driver to the device controller, before
1102 * calling gadget driver's bind() method.
1104 * It allows the controller to be powered off until strictly
1105 * necessary to have it powered on.
1107 * Returns zero on success, else negative errno.
1109 static inline int usb_gadget_udc_start(struct usb_udc *udc)
1114 dev_err(&udc->dev, "UDC had already started\n");
1118 ret = udc->gadget->ops->udc_start(udc->gadget, udc->driver);
1120 udc->started = true;
1126 * usb_gadget_udc_stop - tells usb device controller we don't need it anymore
1127 * @udc: The UDC to be stopped
1129 * This call is issued by the UDC Class driver after calling
1130 * gadget driver's unbind() method.
1132 * The details are implementation specific, but it can go as
1133 * far as powering off UDC completely and disable its data
1136 static inline void usb_gadget_udc_stop(struct usb_udc *udc)
1138 if (!udc->started) {
1139 dev_err(&udc->dev, "UDC had already stopped\n");
1143 udc->gadget->ops->udc_stop(udc->gadget);
1144 udc->started = false;
1148 * usb_gadget_udc_set_speed - tells usb device controller speed supported by
1150 * @udc: The device we want to set maximum speed
1151 * @speed: The maximum speed to allowed to run
1153 * This call is issued by the UDC Class driver before calling
1154 * usb_gadget_udc_start() in order to make sure that we don't try to
1155 * connect on speeds the gadget driver doesn't support.
1157 static inline void usb_gadget_udc_set_speed(struct usb_udc *udc,
1158 enum usb_device_speed speed)
1160 struct usb_gadget *gadget = udc->gadget;
1161 enum usb_device_speed s;
1163 if (speed == USB_SPEED_UNKNOWN)
1164 s = gadget->max_speed;
1166 s = min(speed, gadget->max_speed);
1168 if (s == USB_SPEED_SUPER_PLUS && gadget->ops->udc_set_ssp_rate)
1169 gadget->ops->udc_set_ssp_rate(gadget, gadget->max_ssp_rate);
1170 else if (gadget->ops->udc_set_speed)
1171 gadget->ops->udc_set_speed(gadget, s);
1175 * usb_gadget_enable_async_callbacks - tell usb device controller to enable asynchronous callbacks
1176 * @udc: The UDC which should enable async callbacks
1178 * This routine is used when binding gadget drivers. It undoes the effect
1179 * of usb_gadget_disable_async_callbacks(); the UDC driver should enable IRQs
1180 * (if necessary) and resume issuing callbacks.
1182 * This routine will always be called in process context.
1184 static inline void usb_gadget_enable_async_callbacks(struct usb_udc *udc)
1186 struct usb_gadget *gadget = udc->gadget;
1188 if (gadget->ops->udc_async_callbacks)
1189 gadget->ops->udc_async_callbacks(gadget, true);
1193 * usb_gadget_disable_async_callbacks - tell usb device controller to disable asynchronous callbacks
1194 * @udc: The UDC which should disable async callbacks
1196 * This routine is used when unbinding gadget drivers. It prevents a race:
1197 * The UDC driver doesn't know when the gadget driver's ->unbind callback
1198 * runs, so unless it is told to disable asynchronous callbacks, it might
1199 * issue a callback (such as ->disconnect) after the unbind has completed.
1201 * After this function runs, the UDC driver must suppress all ->suspend,
1202 * ->resume, ->disconnect, ->reset, and ->setup callbacks to the gadget driver
1203 * until async callbacks are again enabled. A simple-minded but effective
1204 * way to accomplish this is to tell the UDC hardware not to generate any
1207 * Request completion callbacks must still be issued. However, it's okay
1208 * to defer them until the request is cancelled, since the pull-up will be
1209 * turned off during the time period when async callbacks are disabled.
1211 * This routine will always be called in process context.
1213 static inline void usb_gadget_disable_async_callbacks(struct usb_udc *udc)
1215 struct usb_gadget *gadget = udc->gadget;
1217 if (gadget->ops->udc_async_callbacks)
1218 gadget->ops->udc_async_callbacks(gadget, false);
1222 * usb_udc_release - release the usb_udc struct
1223 * @dev: the dev member within usb_udc
1225 * This is called by driver's core in order to free memory once the last
1226 * reference is released.
1228 static void usb_udc_release(struct device *dev)
1230 struct usb_udc *udc;
1232 udc = container_of(dev, struct usb_udc, dev);
1233 dev_dbg(dev, "releasing '%s'\n", dev_name(dev));
1237 static const struct attribute_group *usb_udc_attr_groups[];
1239 static void usb_udc_nop_release(struct device *dev)
1241 dev_vdbg(dev, "%s\n", __func__);
1245 * usb_initialize_gadget - initialize a gadget and its embedded struct device
1246 * @parent: the parent device to this udc. Usually the controller driver's
1248 * @gadget: the gadget to be initialized.
1249 * @release: a gadget release function.
1251 void usb_initialize_gadget(struct device *parent, struct usb_gadget *gadget,
1252 void (*release)(struct device *dev))
1254 INIT_WORK(&gadget->work, usb_gadget_state_work);
1255 gadget->dev.parent = parent;
1258 gadget->dev.release = release;
1260 gadget->dev.release = usb_udc_nop_release;
1262 device_initialize(&gadget->dev);
1263 gadget->dev.bus = &gadget_bus_type;
1265 EXPORT_SYMBOL_GPL(usb_initialize_gadget);
1268 * usb_add_gadget - adds a new gadget to the udc class driver list
1269 * @gadget: the gadget to be added to the list.
1271 * Returns zero on success, negative errno otherwise.
1272 * Does not do a final usb_put_gadget() if an error occurs.
1274 int usb_add_gadget(struct usb_gadget *gadget)
1276 struct usb_udc *udc;
1279 udc = kzalloc(sizeof(*udc), GFP_KERNEL);
1283 device_initialize(&udc->dev);
1284 udc->dev.release = usb_udc_release;
1285 udc->dev.class = udc_class;
1286 udc->dev.groups = usb_udc_attr_groups;
1287 udc->dev.parent = gadget->dev.parent;
1288 ret = dev_set_name(&udc->dev, "%s",
1289 kobject_name(&gadget->dev.parent->kobj));
1293 udc->gadget = gadget;
1296 udc->started = false;
1298 mutex_lock(&udc_lock);
1299 list_add_tail(&udc->list, &udc_list);
1300 mutex_unlock(&udc_lock);
1302 ret = device_add(&udc->dev);
1304 goto err_unlist_udc;
1306 usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED);
1309 ret = ida_alloc(&gadget_id_numbers, GFP_KERNEL);
1312 gadget->id_number = ret;
1313 dev_set_name(&gadget->dev, "gadget.%d", ret);
1315 ret = device_add(&gadget->dev);
1322 ida_free(&gadget_id_numbers, gadget->id_number);
1325 flush_work(&gadget->work);
1326 device_del(&udc->dev);
1329 mutex_lock(&udc_lock);
1330 list_del(&udc->list);
1331 mutex_unlock(&udc_lock);
1334 put_device(&udc->dev);
1339 EXPORT_SYMBOL_GPL(usb_add_gadget);
1342 * usb_add_gadget_udc_release - adds a new gadget to the udc class driver list
1343 * @parent: the parent device to this udc. Usually the controller driver's
1345 * @gadget: the gadget to be added to the list.
1346 * @release: a gadget release function.
1348 * Returns zero on success, negative errno otherwise.
1349 * Calls the gadget release function in the latter case.
1351 int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget,
1352 void (*release)(struct device *dev))
1356 usb_initialize_gadget(parent, gadget, release);
1357 ret = usb_add_gadget(gadget);
1359 usb_put_gadget(gadget);
1362 EXPORT_SYMBOL_GPL(usb_add_gadget_udc_release);
1365 * usb_get_gadget_udc_name - get the name of the first UDC controller
1366 * This functions returns the name of the first UDC controller in the system.
1367 * Please note that this interface is usefull only for legacy drivers which
1368 * assume that there is only one UDC controller in the system and they need to
1369 * get its name before initialization. There is no guarantee that the UDC
1370 * of the returned name will be still available, when gadget driver registers
1373 * Returns pointer to string with UDC controller name on success, NULL
1374 * otherwise. Caller should kfree() returned string.
1376 char *usb_get_gadget_udc_name(void)
1378 struct usb_udc *udc;
1381 /* For now we take the first available UDC */
1382 mutex_lock(&udc_lock);
1383 list_for_each_entry(udc, &udc_list, list) {
1385 name = kstrdup(udc->gadget->name, GFP_KERNEL);
1389 mutex_unlock(&udc_lock);
1392 EXPORT_SYMBOL_GPL(usb_get_gadget_udc_name);
1395 * usb_add_gadget_udc - adds a new gadget to the udc class driver list
1396 * @parent: the parent device to this udc. Usually the controller
1398 * @gadget: the gadget to be added to the list
1400 * Returns zero on success, negative errno otherwise.
1402 int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget)
1404 return usb_add_gadget_udc_release(parent, gadget, NULL);
1406 EXPORT_SYMBOL_GPL(usb_add_gadget_udc);
1409 * usb_del_gadget - deletes a gadget and unregisters its udc
1410 * @gadget: the gadget to be deleted.
1412 * This will unbind @gadget, if it is bound.
1413 * It will not do a final usb_put_gadget().
1415 void usb_del_gadget(struct usb_gadget *gadget)
1417 struct usb_udc *udc = gadget->udc;
1422 dev_vdbg(gadget->dev.parent, "unregistering gadget\n");
1424 mutex_lock(&udc_lock);
1425 list_del(&udc->list);
1426 mutex_unlock(&udc_lock);
1428 kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE);
1429 flush_work(&gadget->work);
1430 device_del(&gadget->dev);
1431 ida_free(&gadget_id_numbers, gadget->id_number);
1432 device_unregister(&udc->dev);
1434 EXPORT_SYMBOL_GPL(usb_del_gadget);
1437 * usb_del_gadget_udc - unregisters a gadget
1438 * @gadget: the gadget to be unregistered.
1440 * Calls usb_del_gadget() and does a final usb_put_gadget().
1442 void usb_del_gadget_udc(struct usb_gadget *gadget)
1444 usb_del_gadget(gadget);
1445 usb_put_gadget(gadget);
1447 EXPORT_SYMBOL_GPL(usb_del_gadget_udc);
1449 /* ------------------------------------------------------------------------- */
1451 static int gadget_match_driver(struct device *dev, struct device_driver *drv)
1453 struct usb_gadget *gadget = dev_to_usb_gadget(dev);
1454 struct usb_udc *udc = gadget->udc;
1455 struct usb_gadget_driver *driver = container_of(drv,
1456 struct usb_gadget_driver, driver);
1458 /* If the driver specifies a udc_name, it must match the UDC's name */
1459 if (driver->udc_name &&
1460 strcmp(driver->udc_name, dev_name(&udc->dev)) != 0)
1463 /* If the driver is already bound to a gadget, it doesn't match */
1464 if (driver->is_bound)
1467 /* Otherwise any gadget driver matches any UDC */
1471 static int gadget_bind_driver(struct device *dev)
1473 struct usb_gadget *gadget = dev_to_usb_gadget(dev);
1474 struct usb_udc *udc = gadget->udc;
1475 struct usb_gadget_driver *driver = container_of(dev->driver,
1476 struct usb_gadget_driver, driver);
1479 mutex_lock(&udc_lock);
1480 if (driver->is_bound) {
1481 mutex_unlock(&udc_lock);
1482 return -ENXIO; /* Driver binds to only one gadget */
1484 driver->is_bound = true;
1485 udc->driver = driver;
1486 mutex_unlock(&udc_lock);
1488 dev_dbg(&udc->dev, "binding gadget driver [%s]\n", driver->function);
1490 usb_gadget_udc_set_speed(udc, driver->max_speed);
1492 mutex_lock(&udc_lock);
1493 ret = driver->bind(udc->gadget, driver);
1497 ret = usb_gadget_udc_start(udc);
1500 usb_gadget_enable_async_callbacks(udc);
1501 usb_udc_connect_control(udc);
1502 mutex_unlock(&udc_lock);
1504 kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
1508 driver->unbind(udc->gadget);
1512 dev_err(&udc->dev, "failed to start %s: %d\n",
1513 driver->function, ret);
1516 driver->is_bound = false;
1517 mutex_unlock(&udc_lock);
1522 static void gadget_unbind_driver(struct device *dev)
1524 struct usb_gadget *gadget = dev_to_usb_gadget(dev);
1525 struct usb_udc *udc = gadget->udc;
1526 struct usb_gadget_driver *driver = udc->driver;
1528 dev_dbg(&udc->dev, "unbinding gadget driver [%s]\n", driver->function);
1530 kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
1532 mutex_lock(&udc_lock);
1533 usb_gadget_disconnect(gadget);
1534 usb_gadget_disable_async_callbacks(udc);
1536 synchronize_irq(gadget->irq);
1537 udc->driver->unbind(gadget);
1538 usb_gadget_udc_stop(udc);
1540 driver->is_bound = false;
1542 mutex_unlock(&udc_lock);
1545 /* ------------------------------------------------------------------------- */
1547 int usb_gadget_register_driver_owner(struct usb_gadget_driver *driver,
1548 struct module *owner, const char *mod_name)
1552 if (!driver || !driver->bind || !driver->setup)
1555 driver->driver.bus = &gadget_bus_type;
1556 driver->driver.owner = owner;
1557 driver->driver.mod_name = mod_name;
1558 ret = driver_register(&driver->driver);
1560 pr_warn("%s: driver registration failed: %d\n",
1561 driver->function, ret);
1565 mutex_lock(&udc_lock);
1566 if (!driver->is_bound) {
1567 if (driver->match_existing_only) {
1568 pr_warn("%s: couldn't find an available UDC or it's busy\n",
1572 pr_info("%s: couldn't find an available UDC\n",
1577 mutex_unlock(&udc_lock);
1580 driver_unregister(&driver->driver);
1583 EXPORT_SYMBOL_GPL(usb_gadget_register_driver_owner);
1585 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1587 if (!driver || !driver->unbind)
1590 driver_unregister(&driver->driver);
1593 EXPORT_SYMBOL_GPL(usb_gadget_unregister_driver);
1595 /* ------------------------------------------------------------------------- */
1597 static ssize_t srp_store(struct device *dev,
1598 struct device_attribute *attr, const char *buf, size_t n)
1600 struct usb_udc *udc = container_of(dev, struct usb_udc, dev);
1602 if (sysfs_streq(buf, "1"))
1603 usb_gadget_wakeup(udc->gadget);
1607 static DEVICE_ATTR_WO(srp);
1609 static ssize_t soft_connect_store(struct device *dev,
1610 struct device_attribute *attr, const char *buf, size_t n)
1612 struct usb_udc *udc = container_of(dev, struct usb_udc, dev);
1615 mutex_lock(&udc_lock);
1617 dev_err(dev, "soft-connect without a gadget driver\n");
1622 if (sysfs_streq(buf, "connect")) {
1623 usb_gadget_udc_start(udc);
1624 usb_gadget_connect(udc->gadget);
1625 } else if (sysfs_streq(buf, "disconnect")) {
1626 usb_gadget_disconnect(udc->gadget);
1627 usb_gadget_udc_stop(udc);
1629 dev_err(dev, "unsupported command '%s'\n", buf);
1636 mutex_unlock(&udc_lock);
1639 static DEVICE_ATTR_WO(soft_connect);
1641 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
1644 struct usb_udc *udc = container_of(dev, struct usb_udc, dev);
1645 struct usb_gadget *gadget = udc->gadget;
1647 return sprintf(buf, "%s\n", usb_state_string(gadget->state));
1649 static DEVICE_ATTR_RO(state);
1651 static ssize_t function_show(struct device *dev, struct device_attribute *attr,
1654 struct usb_udc *udc = container_of(dev, struct usb_udc, dev);
1655 struct usb_gadget_driver *drv = udc->driver;
1657 if (!drv || !drv->function)
1659 return scnprintf(buf, PAGE_SIZE, "%s\n", drv->function);
1661 static DEVICE_ATTR_RO(function);
1663 #define USB_UDC_SPEED_ATTR(name, param) \
1664 ssize_t name##_show(struct device *dev, \
1665 struct device_attribute *attr, char *buf) \
1667 struct usb_udc *udc = container_of(dev, struct usb_udc, dev); \
1668 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1669 usb_speed_string(udc->gadget->param)); \
1671 static DEVICE_ATTR_RO(name)
1673 static USB_UDC_SPEED_ATTR(current_speed, speed);
1674 static USB_UDC_SPEED_ATTR(maximum_speed, max_speed);
1676 #define USB_UDC_ATTR(name) \
1677 ssize_t name##_show(struct device *dev, \
1678 struct device_attribute *attr, char *buf) \
1680 struct usb_udc *udc = container_of(dev, struct usb_udc, dev); \
1681 struct usb_gadget *gadget = udc->gadget; \
1683 return scnprintf(buf, PAGE_SIZE, "%d\n", gadget->name); \
1685 static DEVICE_ATTR_RO(name)
1687 static USB_UDC_ATTR(is_otg);
1688 static USB_UDC_ATTR(is_a_peripheral);
1689 static USB_UDC_ATTR(b_hnp_enable);
1690 static USB_UDC_ATTR(a_hnp_support);
1691 static USB_UDC_ATTR(a_alt_hnp_support);
1692 static USB_UDC_ATTR(is_selfpowered);
1694 static struct attribute *usb_udc_attrs[] = {
1696 &dev_attr_soft_connect.attr,
1697 &dev_attr_state.attr,
1698 &dev_attr_function.attr,
1699 &dev_attr_current_speed.attr,
1700 &dev_attr_maximum_speed.attr,
1702 &dev_attr_is_otg.attr,
1703 &dev_attr_is_a_peripheral.attr,
1704 &dev_attr_b_hnp_enable.attr,
1705 &dev_attr_a_hnp_support.attr,
1706 &dev_attr_a_alt_hnp_support.attr,
1707 &dev_attr_is_selfpowered.attr,
1711 static const struct attribute_group usb_udc_attr_group = {
1712 .attrs = usb_udc_attrs,
1715 static const struct attribute_group *usb_udc_attr_groups[] = {
1716 &usb_udc_attr_group,
1720 static int usb_udc_uevent(struct device *dev, struct kobj_uevent_env *env)
1722 struct usb_udc *udc = container_of(dev, struct usb_udc, dev);
1725 ret = add_uevent_var(env, "USB_UDC_NAME=%s", udc->gadget->name);
1727 dev_err(dev, "failed to add uevent USB_UDC_NAME\n");
1731 mutex_lock(&udc_lock);
1733 ret = add_uevent_var(env, "USB_UDC_DRIVER=%s",
1734 udc->driver->function);
1735 mutex_unlock(&udc_lock);
1737 dev_err(dev, "failed to add uevent USB_UDC_DRIVER\n");
1744 static struct bus_type gadget_bus_type = {
1746 .probe = gadget_bind_driver,
1747 .remove = gadget_unbind_driver,
1748 .match = gadget_match_driver,
1751 static int __init usb_udc_init(void)
1755 udc_class = class_create(THIS_MODULE, "udc");
1756 if (IS_ERR(udc_class)) {
1757 pr_err("failed to create udc class --> %ld\n",
1758 PTR_ERR(udc_class));
1759 return PTR_ERR(udc_class);
1762 udc_class->dev_uevent = usb_udc_uevent;
1764 rc = bus_register(&gadget_bus_type);
1766 class_destroy(udc_class);
1769 subsys_initcall(usb_udc_init);
1771 static void __exit usb_udc_exit(void)
1773 bus_unregister(&gadget_bus_type);
1774 class_destroy(udc_class);
1776 module_exit(usb_udc_exit);
1778 MODULE_DESCRIPTION("UDC Framework");
1779 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
1780 MODULE_LICENSE("GPL v2");