1 // SPDX-License-Identifier: GPL-2.0
3 * USB Raw Gadget driver.
4 * See Documentation/usb/raw-gadget.rst for more details.
6 * Copyright (c) 2020 Google, Inc.
7 * Author: Andrey Konovalov <andreyknvl@gmail.com>
10 #include <linux/compiler.h>
11 #include <linux/ctype.h>
12 #include <linux/debugfs.h>
13 #include <linux/delay.h>
14 #include <linux/idr.h>
15 #include <linux/kref.h>
16 #include <linux/miscdevice.h>
17 #include <linux/module.h>
18 #include <linux/semaphore.h>
19 #include <linux/sched.h>
20 #include <linux/slab.h>
21 #include <linux/uaccess.h>
22 #include <linux/wait.h>
24 #include <linux/usb.h>
25 #include <linux/usb/ch9.h>
26 #include <linux/usb/ch11.h>
27 #include <linux/usb/gadget.h>
29 #include <uapi/linux/usb/raw_gadget.h>
31 #define DRIVER_DESC "USB Raw Gadget"
32 #define DRIVER_NAME "raw-gadget"
34 MODULE_DESCRIPTION(DRIVER_DESC);
35 MODULE_AUTHOR("Andrey Konovalov");
36 MODULE_LICENSE("GPL");
38 /*----------------------------------------------------------------------*/
40 static DEFINE_IDA(driver_id_numbers);
41 #define DRIVER_DRIVER_NAME_LENGTH_MAX 32
43 #define RAW_EVENT_QUEUE_SIZE 16
45 struct raw_event_queue {
46 /* See the comment in raw_event_queue_fetch() for locking details. */
48 struct semaphore sema;
49 struct usb_raw_event *events[RAW_EVENT_QUEUE_SIZE];
53 static void raw_event_queue_init(struct raw_event_queue *queue)
55 spin_lock_init(&queue->lock);
56 sema_init(&queue->sema, 0);
60 static int raw_event_queue_add(struct raw_event_queue *queue,
61 enum usb_raw_event_type type, size_t length, const void *data)
64 struct usb_raw_event *event;
66 spin_lock_irqsave(&queue->lock, flags);
67 if (WARN_ON(queue->size >= RAW_EVENT_QUEUE_SIZE)) {
68 spin_unlock_irqrestore(&queue->lock, flags);
71 event = kmalloc(sizeof(*event) + length, GFP_ATOMIC);
73 spin_unlock_irqrestore(&queue->lock, flags);
77 event->length = length;
79 memcpy(&event->data[0], data, length);
80 queue->events[queue->size] = event;
83 spin_unlock_irqrestore(&queue->lock, flags);
87 static struct usb_raw_event *raw_event_queue_fetch(
88 struct raw_event_queue *queue)
92 struct usb_raw_event *event;
95 * This function can be called concurrently. We first check that
96 * there's at least one event queued by decrementing the semaphore,
97 * and then take the lock to protect queue struct fields.
99 ret = down_interruptible(&queue->sema);
102 spin_lock_irqsave(&queue->lock, flags);
104 * queue->size must have the same value as queue->sema counter (before
105 * the down_interruptible() call above), so this check is a fail-safe.
107 if (WARN_ON(!queue->size)) {
108 spin_unlock_irqrestore(&queue->lock, flags);
109 return ERR_PTR(-ENODEV);
111 event = queue->events[0];
113 memmove(&queue->events[0], &queue->events[1],
114 queue->size * sizeof(queue->events[0]));
115 spin_unlock_irqrestore(&queue->lock, flags);
119 static void raw_event_queue_destroy(struct raw_event_queue *queue)
123 for (i = 0; i < queue->size; i++)
124 kfree(queue->events[i]);
128 /*----------------------------------------------------------------------*/
142 struct usb_request *req;
149 STATE_DEV_INVALID = 0,
151 STATE_DEV_INITIALIZED,
152 STATE_DEV_REGISTERING,
162 const char *udc_name;
163 struct usb_gadget_driver driver;
165 /* Reference to misc device: */
168 /* Make driver names unique */
169 int driver_id_number;
171 /* Protected by lock: */
172 enum dev_state state;
173 bool gadget_registered;
174 struct usb_gadget *gadget;
175 struct usb_request *req;
177 bool ep0_out_pending;
180 struct raw_ep eps[USB_RAW_EPS_NUM_MAX];
183 struct completion ep0_done;
184 struct raw_event_queue queue;
187 static struct raw_dev *dev_new(void)
191 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
194 /* Matches kref_put() in raw_release(). */
195 kref_init(&dev->count);
196 spin_lock_init(&dev->lock);
197 init_completion(&dev->ep0_done);
198 raw_event_queue_init(&dev->queue);
199 dev->driver_id_number = -1;
203 static void dev_free(struct kref *kref)
205 struct raw_dev *dev = container_of(kref, struct raw_dev, count);
208 kfree(dev->udc_name);
209 kfree(dev->driver.udc_name);
210 kfree(dev->driver.driver.name);
211 if (dev->driver_id_number >= 0)
212 ida_free(&driver_id_numbers, dev->driver_id_number);
214 if (dev->ep0_urb_queued)
215 usb_ep_dequeue(dev->gadget->ep0, dev->req);
216 usb_ep_free_request(dev->gadget->ep0, dev->req);
218 raw_event_queue_destroy(&dev->queue);
219 for (i = 0; i < dev->eps_num; i++) {
220 if (dev->eps[i].state == STATE_EP_DISABLED)
222 usb_ep_disable(dev->eps[i].ep);
223 usb_ep_free_request(dev->eps[i].ep, dev->eps[i].req);
224 kfree(dev->eps[i].ep->desc);
225 dev->eps[i].state = STATE_EP_DISABLED;
230 /*----------------------------------------------------------------------*/
232 static int raw_queue_event(struct raw_dev *dev,
233 enum usb_raw_event_type type, size_t length, const void *data)
238 ret = raw_event_queue_add(&dev->queue, type, length, data);
240 spin_lock_irqsave(&dev->lock, flags);
241 dev->state = STATE_DEV_FAILED;
242 spin_unlock_irqrestore(&dev->lock, flags);
247 static void gadget_ep0_complete(struct usb_ep *ep, struct usb_request *req)
249 struct raw_dev *dev = req->context;
252 spin_lock_irqsave(&dev->lock, flags);
254 dev->ep0_status = req->status;
256 dev->ep0_status = req->actual;
257 if (dev->ep0_in_pending)
258 dev->ep0_in_pending = false;
260 dev->ep0_out_pending = false;
261 spin_unlock_irqrestore(&dev->lock, flags);
263 complete(&dev->ep0_done);
266 static u8 get_ep_addr(const char *name)
268 /* If the endpoint has fixed function (named as e.g. "ep12out-bulk"),
269 * parse the endpoint address from its name. We deliberately use
270 * deprecated simple_strtoul() function here, as the number isn't
271 * followed by '\0' nor '\n'.
273 if (isdigit(name[2]))
274 return simple_strtoul(&name[2], NULL, 10);
275 /* Otherwise the endpoint is configurable (named as e.g. "ep-a"). */
276 return USB_RAW_EP_ADDR_ANY;
279 static int gadget_bind(struct usb_gadget *gadget,
280 struct usb_gadget_driver *driver)
283 struct raw_dev *dev = container_of(driver, struct raw_dev, driver);
284 struct usb_request *req;
288 if (strcmp(gadget->name, dev->udc_name) != 0)
291 set_gadget_data(gadget, dev);
292 req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
294 dev_err(&gadget->dev, "usb_ep_alloc_request failed\n");
295 set_gadget_data(gadget, NULL);
299 spin_lock_irqsave(&dev->lock, flags);
301 dev->req->context = dev;
302 dev->req->complete = gadget_ep0_complete;
303 dev->gadget = gadget;
304 gadget_for_each_ep(ep, dev->gadget) {
306 dev->eps[i].addr = get_ep_addr(ep->name);
307 dev->eps[i].state = STATE_EP_DISABLED;
311 spin_unlock_irqrestore(&dev->lock, flags);
313 /* Matches kref_put() in gadget_unbind(). */
314 kref_get(&dev->count);
316 ret = raw_queue_event(dev, USB_RAW_EVENT_CONNECT, 0, NULL);
318 dev_err(&gadget->dev, "failed to queue event\n");
323 static void gadget_unbind(struct usb_gadget *gadget)
325 struct raw_dev *dev = get_gadget_data(gadget);
327 set_gadget_data(gadget, NULL);
328 /* Matches kref_get() in gadget_bind(). */
329 kref_put(&dev->count, dev_free);
332 static int gadget_setup(struct usb_gadget *gadget,
333 const struct usb_ctrlrequest *ctrl)
336 struct raw_dev *dev = get_gadget_data(gadget);
339 spin_lock_irqsave(&dev->lock, flags);
340 if (dev->state != STATE_DEV_RUNNING) {
341 dev_err(&gadget->dev, "ignoring, device is not running\n");
345 if (dev->ep0_in_pending || dev->ep0_out_pending) {
346 dev_dbg(&gadget->dev, "stalling, request already pending\n");
350 if ((ctrl->bRequestType & USB_DIR_IN) && ctrl->wLength)
351 dev->ep0_in_pending = true;
353 dev->ep0_out_pending = true;
354 spin_unlock_irqrestore(&dev->lock, flags);
356 ret = raw_queue_event(dev, USB_RAW_EVENT_CONTROL, sizeof(*ctrl), ctrl);
358 dev_err(&gadget->dev, "failed to queue event\n");
362 spin_unlock_irqrestore(&dev->lock, flags);
367 /* These are currently unused but present in case UDC driver requires them. */
368 static void gadget_disconnect(struct usb_gadget *gadget) { }
369 static void gadget_suspend(struct usb_gadget *gadget) { }
370 static void gadget_resume(struct usb_gadget *gadget) { }
371 static void gadget_reset(struct usb_gadget *gadget) { }
373 /*----------------------------------------------------------------------*/
375 static struct miscdevice raw_misc_device;
377 static int raw_open(struct inode *inode, struct file *fd)
381 /* Nonblocking I/O is not supported yet. */
382 if (fd->f_flags & O_NONBLOCK)
388 fd->private_data = dev;
389 dev->state = STATE_DEV_OPENED;
390 dev->dev = raw_misc_device.this_device;
394 static int raw_release(struct inode *inode, struct file *fd)
397 struct raw_dev *dev = fd->private_data;
399 bool unregister = false;
401 spin_lock_irqsave(&dev->lock, flags);
402 dev->state = STATE_DEV_CLOSED;
404 spin_unlock_irqrestore(&dev->lock, flags);
407 if (dev->gadget_registered)
409 dev->gadget_registered = false;
410 spin_unlock_irqrestore(&dev->lock, flags);
413 ret = usb_gadget_unregister_driver(&dev->driver);
416 "usb_gadget_unregister_driver() failed with %d\n",
418 /* Matches kref_get() in raw_ioctl_run(). */
419 kref_put(&dev->count, dev_free);
423 /* Matches dev_new() in raw_open(). */
424 kref_put(&dev->count, dev_free);
428 /*----------------------------------------------------------------------*/
430 static int raw_ioctl_init(struct raw_dev *dev, unsigned long value)
433 int driver_id_number;
434 struct usb_raw_init arg;
435 char *udc_driver_name;
436 char *udc_device_name;
437 char *driver_driver_name;
440 if (copy_from_user(&arg, (void __user *)value, sizeof(arg)))
444 case USB_SPEED_UNKNOWN:
445 arg.speed = USB_SPEED_HIGH;
450 case USB_SPEED_SUPER:
456 driver_id_number = ida_alloc(&driver_id_numbers, GFP_KERNEL);
457 if (driver_id_number < 0)
458 return driver_id_number;
460 driver_driver_name = kmalloc(DRIVER_DRIVER_NAME_LENGTH_MAX, GFP_KERNEL);
461 if (!driver_driver_name) {
463 goto out_free_driver_id_number;
465 snprintf(driver_driver_name, DRIVER_DRIVER_NAME_LENGTH_MAX,
466 DRIVER_NAME ".%d", driver_id_number);
468 udc_driver_name = kmalloc(UDC_NAME_LENGTH_MAX, GFP_KERNEL);
469 if (!udc_driver_name) {
471 goto out_free_driver_driver_name;
473 ret = strscpy(udc_driver_name, &arg.driver_name[0],
474 UDC_NAME_LENGTH_MAX);
476 goto out_free_udc_driver_name;
479 udc_device_name = kmalloc(UDC_NAME_LENGTH_MAX, GFP_KERNEL);
480 if (!udc_device_name) {
482 goto out_free_udc_driver_name;
484 ret = strscpy(udc_device_name, &arg.device_name[0],
485 UDC_NAME_LENGTH_MAX);
487 goto out_free_udc_device_name;
490 spin_lock_irqsave(&dev->lock, flags);
491 if (dev->state != STATE_DEV_OPENED) {
492 dev_dbg(dev->dev, "fail, device is not opened\n");
496 dev->udc_name = udc_driver_name;
498 dev->driver.function = DRIVER_DESC;
499 dev->driver.max_speed = arg.speed;
500 dev->driver.setup = gadget_setup;
501 dev->driver.disconnect = gadget_disconnect;
502 dev->driver.bind = gadget_bind;
503 dev->driver.unbind = gadget_unbind;
504 dev->driver.suspend = gadget_suspend;
505 dev->driver.resume = gadget_resume;
506 dev->driver.reset = gadget_reset;
507 dev->driver.driver.name = driver_driver_name;
508 dev->driver.udc_name = udc_device_name;
509 dev->driver.match_existing_only = 1;
510 dev->driver_id_number = driver_id_number;
512 dev->state = STATE_DEV_INITIALIZED;
513 spin_unlock_irqrestore(&dev->lock, flags);
517 spin_unlock_irqrestore(&dev->lock, flags);
518 out_free_udc_device_name:
519 kfree(udc_device_name);
520 out_free_udc_driver_name:
521 kfree(udc_driver_name);
522 out_free_driver_driver_name:
523 kfree(driver_driver_name);
524 out_free_driver_id_number:
525 ida_free(&driver_id_numbers, driver_id_number);
529 static int raw_ioctl_run(struct raw_dev *dev, unsigned long value)
537 spin_lock_irqsave(&dev->lock, flags);
538 if (dev->state != STATE_DEV_INITIALIZED) {
539 dev_dbg(dev->dev, "fail, device is not initialized\n");
543 dev->state = STATE_DEV_REGISTERING;
544 spin_unlock_irqrestore(&dev->lock, flags);
546 ret = usb_gadget_register_driver(&dev->driver);
548 spin_lock_irqsave(&dev->lock, flags);
551 "fail, usb_gadget_register_driver returned %d\n", ret);
552 dev->state = STATE_DEV_FAILED;
555 dev->gadget_registered = true;
556 dev->state = STATE_DEV_RUNNING;
557 /* Matches kref_put() in raw_release(). */
558 kref_get(&dev->count);
561 spin_unlock_irqrestore(&dev->lock, flags);
565 static int raw_ioctl_event_fetch(struct raw_dev *dev, unsigned long value)
567 struct usb_raw_event arg;
569 struct usb_raw_event *event;
572 if (copy_from_user(&arg, (void __user *)value, sizeof(arg)))
575 spin_lock_irqsave(&dev->lock, flags);
576 if (dev->state != STATE_DEV_RUNNING) {
577 dev_dbg(dev->dev, "fail, device is not running\n");
578 spin_unlock_irqrestore(&dev->lock, flags);
582 dev_dbg(dev->dev, "fail, gadget is not bound\n");
583 spin_unlock_irqrestore(&dev->lock, flags);
586 spin_unlock_irqrestore(&dev->lock, flags);
588 event = raw_event_queue_fetch(&dev->queue);
589 if (PTR_ERR(event) == -EINTR) {
590 dev_dbg(&dev->gadget->dev, "event fetching interrupted\n");
594 dev_err(&dev->gadget->dev, "failed to fetch event\n");
595 spin_lock_irqsave(&dev->lock, flags);
596 dev->state = STATE_DEV_FAILED;
597 spin_unlock_irqrestore(&dev->lock, flags);
600 length = min(arg.length, event->length);
601 if (copy_to_user((void __user *)value, event, sizeof(*event) + length)) {
610 static void *raw_alloc_io_data(struct usb_raw_ep_io *io, void __user *ptr,
615 if (copy_from_user(io, ptr, sizeof(*io)))
616 return ERR_PTR(-EFAULT);
617 if (io->ep >= USB_RAW_EPS_NUM_MAX)
618 return ERR_PTR(-EINVAL);
619 if (!usb_raw_io_flags_valid(io->flags))
620 return ERR_PTR(-EINVAL);
621 if (io->length > PAGE_SIZE)
622 return ERR_PTR(-EINVAL);
624 data = memdup_user(ptr + sizeof(*io), io->length);
626 data = kmalloc(io->length, GFP_KERNEL);
628 data = ERR_PTR(-ENOMEM);
633 static int raw_process_ep0_io(struct raw_dev *dev, struct usb_raw_ep_io *io,
639 spin_lock_irqsave(&dev->lock, flags);
640 if (dev->state != STATE_DEV_RUNNING) {
641 dev_dbg(dev->dev, "fail, device is not running\n");
646 dev_dbg(dev->dev, "fail, gadget is not bound\n");
650 if (dev->ep0_urb_queued) {
651 dev_dbg(&dev->gadget->dev, "fail, urb already queued\n");
655 if ((in && !dev->ep0_in_pending) ||
656 (!in && !dev->ep0_out_pending)) {
657 dev_dbg(&dev->gadget->dev, "fail, wrong direction\n");
661 if (WARN_ON(in && dev->ep0_out_pending)) {
663 dev->state = STATE_DEV_FAILED;
666 if (WARN_ON(!in && dev->ep0_in_pending)) {
668 dev->state = STATE_DEV_FAILED;
672 dev->req->buf = data;
673 dev->req->length = io->length;
674 dev->req->zero = usb_raw_io_flags_zero(io->flags);
675 dev->ep0_urb_queued = true;
676 spin_unlock_irqrestore(&dev->lock, flags);
678 ret = usb_ep_queue(dev->gadget->ep0, dev->req, GFP_KERNEL);
680 dev_err(&dev->gadget->dev,
681 "fail, usb_ep_queue returned %d\n", ret);
682 spin_lock_irqsave(&dev->lock, flags);
683 dev->state = STATE_DEV_FAILED;
687 ret = wait_for_completion_interruptible(&dev->ep0_done);
689 dev_dbg(&dev->gadget->dev, "wait interrupted\n");
690 usb_ep_dequeue(dev->gadget->ep0, dev->req);
691 wait_for_completion(&dev->ep0_done);
692 spin_lock_irqsave(&dev->lock, flags);
696 spin_lock_irqsave(&dev->lock, flags);
697 ret = dev->ep0_status;
700 dev->ep0_urb_queued = false;
702 spin_unlock_irqrestore(&dev->lock, flags);
706 static int raw_ioctl_ep0_write(struct raw_dev *dev, unsigned long value)
710 struct usb_raw_ep_io io;
712 data = raw_alloc_io_data(&io, (void __user *)value, true);
714 return PTR_ERR(data);
715 ret = raw_process_ep0_io(dev, &io, data, true);
720 static int raw_ioctl_ep0_read(struct raw_dev *dev, unsigned long value)
724 struct usb_raw_ep_io io;
727 data = raw_alloc_io_data(&io, (void __user *)value, false);
729 return PTR_ERR(data);
730 ret = raw_process_ep0_io(dev, &io, data, false);
734 length = min(io.length, (unsigned int)ret);
735 if (copy_to_user((void __user *)(value + sizeof(io)), data, length))
744 static int raw_ioctl_ep0_stall(struct raw_dev *dev, unsigned long value)
751 spin_lock_irqsave(&dev->lock, flags);
752 if (dev->state != STATE_DEV_RUNNING) {
753 dev_dbg(dev->dev, "fail, device is not running\n");
758 dev_dbg(dev->dev, "fail, gadget is not bound\n");
762 if (dev->ep0_urb_queued) {
763 dev_dbg(&dev->gadget->dev, "fail, urb already queued\n");
767 if (!dev->ep0_in_pending && !dev->ep0_out_pending) {
768 dev_dbg(&dev->gadget->dev, "fail, no request pending\n");
773 ret = usb_ep_set_halt(dev->gadget->ep0);
775 dev_err(&dev->gadget->dev,
776 "fail, usb_ep_set_halt returned %d\n", ret);
778 if (dev->ep0_in_pending)
779 dev->ep0_in_pending = false;
781 dev->ep0_out_pending = false;
784 spin_unlock_irqrestore(&dev->lock, flags);
788 static int raw_ioctl_ep_enable(struct raw_dev *dev, unsigned long value)
792 struct usb_endpoint_descriptor *desc;
794 bool ep_props_matched = false;
796 desc = memdup_user((void __user *)value, sizeof(*desc));
798 return PTR_ERR(desc);
801 * Endpoints with a maxpacket length of 0 can cause crashes in UDC
804 if (usb_endpoint_maxp(desc) == 0) {
805 dev_dbg(dev->dev, "fail, bad endpoint maxpacket\n");
810 spin_lock_irqsave(&dev->lock, flags);
811 if (dev->state != STATE_DEV_RUNNING) {
812 dev_dbg(dev->dev, "fail, device is not running\n");
817 dev_dbg(dev->dev, "fail, gadget is not bound\n");
822 for (i = 0; i < dev->eps_num; i++) {
824 if (ep->addr != usb_endpoint_num(desc) &&
825 ep->addr != USB_RAW_EP_ADDR_ANY)
827 if (!usb_gadget_ep_match_desc(dev->gadget, ep->ep, desc, NULL))
829 ep_props_matched = true;
830 if (ep->state != STATE_EP_DISABLED)
833 ret = usb_ep_enable(ep->ep);
835 dev_err(&dev->gadget->dev,
836 "fail, usb_ep_enable returned %d\n", ret);
839 ep->req = usb_ep_alloc_request(ep->ep, GFP_ATOMIC);
841 dev_err(&dev->gadget->dev,
842 "fail, usb_ep_alloc_request failed\n");
843 usb_ep_disable(ep->ep);
847 ep->state = STATE_EP_ENABLED;
848 ep->ep->driver_data = ep;
853 if (!ep_props_matched) {
854 dev_dbg(&dev->gadget->dev, "fail, bad endpoint descriptor\n");
857 dev_dbg(&dev->gadget->dev, "fail, no endpoints available\n");
864 spin_unlock_irqrestore(&dev->lock, flags);
868 static int raw_ioctl_ep_disable(struct raw_dev *dev, unsigned long value)
870 int ret = 0, i = value;
873 spin_lock_irqsave(&dev->lock, flags);
874 if (dev->state != STATE_DEV_RUNNING) {
875 dev_dbg(dev->dev, "fail, device is not running\n");
880 dev_dbg(dev->dev, "fail, gadget is not bound\n");
884 if (i < 0 || i >= dev->eps_num) {
885 dev_dbg(dev->dev, "fail, invalid endpoint\n");
889 if (dev->eps[i].state == STATE_EP_DISABLED) {
890 dev_dbg(&dev->gadget->dev, "fail, endpoint is not enabled\n");
894 if (dev->eps[i].disabling) {
895 dev_dbg(&dev->gadget->dev,
896 "fail, disable already in progress\n");
900 if (dev->eps[i].urb_queued) {
901 dev_dbg(&dev->gadget->dev,
902 "fail, waiting for urb completion\n");
906 dev->eps[i].disabling = true;
907 spin_unlock_irqrestore(&dev->lock, flags);
909 usb_ep_disable(dev->eps[i].ep);
911 spin_lock_irqsave(&dev->lock, flags);
912 usb_ep_free_request(dev->eps[i].ep, dev->eps[i].req);
913 kfree(dev->eps[i].ep->desc);
914 dev->eps[i].state = STATE_EP_DISABLED;
915 dev->eps[i].disabling = false;
918 spin_unlock_irqrestore(&dev->lock, flags);
922 static int raw_ioctl_ep_set_clear_halt_wedge(struct raw_dev *dev,
923 unsigned long value, bool set, bool halt)
925 int ret = 0, i = value;
928 spin_lock_irqsave(&dev->lock, flags);
929 if (dev->state != STATE_DEV_RUNNING) {
930 dev_dbg(dev->dev, "fail, device is not running\n");
935 dev_dbg(dev->dev, "fail, gadget is not bound\n");
939 if (i < 0 || i >= dev->eps_num) {
940 dev_dbg(dev->dev, "fail, invalid endpoint\n");
944 if (dev->eps[i].state == STATE_EP_DISABLED) {
945 dev_dbg(&dev->gadget->dev, "fail, endpoint is not enabled\n");
949 if (dev->eps[i].disabling) {
950 dev_dbg(&dev->gadget->dev,
951 "fail, disable is in progress\n");
955 if (dev->eps[i].urb_queued) {
956 dev_dbg(&dev->gadget->dev,
957 "fail, waiting for urb completion\n");
961 if (usb_endpoint_xfer_isoc(dev->eps[i].ep->desc)) {
962 dev_dbg(&dev->gadget->dev,
963 "fail, can't halt/wedge ISO endpoint\n");
969 ret = usb_ep_set_halt(dev->eps[i].ep);
971 dev_err(&dev->gadget->dev,
972 "fail, usb_ep_set_halt returned %d\n", ret);
973 } else if (!set && halt) {
974 ret = usb_ep_clear_halt(dev->eps[i].ep);
976 dev_err(&dev->gadget->dev,
977 "fail, usb_ep_clear_halt returned %d\n", ret);
978 } else if (set && !halt) {
979 ret = usb_ep_set_wedge(dev->eps[i].ep);
981 dev_err(&dev->gadget->dev,
982 "fail, usb_ep_set_wedge returned %d\n", ret);
986 spin_unlock_irqrestore(&dev->lock, flags);
990 static void gadget_ep_complete(struct usb_ep *ep, struct usb_request *req)
992 struct raw_ep *r_ep = (struct raw_ep *)ep->driver_data;
993 struct raw_dev *dev = r_ep->dev;
996 spin_lock_irqsave(&dev->lock, flags);
998 r_ep->status = req->status;
1000 r_ep->status = req->actual;
1001 spin_unlock_irqrestore(&dev->lock, flags);
1003 complete((struct completion *)req->context);
1006 static int raw_process_ep_io(struct raw_dev *dev, struct usb_raw_ep_io *io,
1007 void *data, bool in)
1010 unsigned long flags;
1012 DECLARE_COMPLETION_ONSTACK(done);
1014 spin_lock_irqsave(&dev->lock, flags);
1015 if (dev->state != STATE_DEV_RUNNING) {
1016 dev_dbg(dev->dev, "fail, device is not running\n");
1021 dev_dbg(dev->dev, "fail, gadget is not bound\n");
1025 if (io->ep >= dev->eps_num) {
1026 dev_dbg(&dev->gadget->dev, "fail, invalid endpoint\n");
1030 ep = &dev->eps[io->ep];
1031 if (ep->state != STATE_EP_ENABLED) {
1032 dev_dbg(&dev->gadget->dev, "fail, endpoint is not enabled\n");
1036 if (ep->disabling) {
1037 dev_dbg(&dev->gadget->dev,
1038 "fail, endpoint is already being disabled\n");
1042 if (ep->urb_queued) {
1043 dev_dbg(&dev->gadget->dev, "fail, urb already queued\n");
1047 if (in != usb_endpoint_dir_in(ep->ep->desc)) {
1048 dev_dbg(&dev->gadget->dev, "fail, wrong direction\n");
1054 ep->req->context = &done;
1055 ep->req->complete = gadget_ep_complete;
1056 ep->req->buf = data;
1057 ep->req->length = io->length;
1058 ep->req->zero = usb_raw_io_flags_zero(io->flags);
1059 ep->urb_queued = true;
1060 spin_unlock_irqrestore(&dev->lock, flags);
1062 ret = usb_ep_queue(ep->ep, ep->req, GFP_KERNEL);
1064 dev_err(&dev->gadget->dev,
1065 "fail, usb_ep_queue returned %d\n", ret);
1066 spin_lock_irqsave(&dev->lock, flags);
1067 dev->state = STATE_DEV_FAILED;
1071 ret = wait_for_completion_interruptible(&done);
1073 dev_dbg(&dev->gadget->dev, "wait interrupted\n");
1074 usb_ep_dequeue(ep->ep, ep->req);
1075 wait_for_completion(&done);
1076 spin_lock_irqsave(&dev->lock, flags);
1080 spin_lock_irqsave(&dev->lock, flags);
1084 ep->urb_queued = false;
1086 spin_unlock_irqrestore(&dev->lock, flags);
1090 static int raw_ioctl_ep_write(struct raw_dev *dev, unsigned long value)
1094 struct usb_raw_ep_io io;
1096 data = raw_alloc_io_data(&io, (void __user *)value, true);
1098 return PTR_ERR(data);
1099 ret = raw_process_ep_io(dev, &io, data, true);
1104 static int raw_ioctl_ep_read(struct raw_dev *dev, unsigned long value)
1108 struct usb_raw_ep_io io;
1109 unsigned int length;
1111 data = raw_alloc_io_data(&io, (void __user *)value, false);
1113 return PTR_ERR(data);
1114 ret = raw_process_ep_io(dev, &io, data, false);
1118 length = min(io.length, (unsigned int)ret);
1119 if (copy_to_user((void __user *)(value + sizeof(io)), data, length))
1128 static int raw_ioctl_configure(struct raw_dev *dev, unsigned long value)
1131 unsigned long flags;
1135 spin_lock_irqsave(&dev->lock, flags);
1136 if (dev->state != STATE_DEV_RUNNING) {
1137 dev_dbg(dev->dev, "fail, device is not running\n");
1142 dev_dbg(dev->dev, "fail, gadget is not bound\n");
1146 usb_gadget_set_state(dev->gadget, USB_STATE_CONFIGURED);
1149 spin_unlock_irqrestore(&dev->lock, flags);
1153 static int raw_ioctl_vbus_draw(struct raw_dev *dev, unsigned long value)
1156 unsigned long flags;
1158 spin_lock_irqsave(&dev->lock, flags);
1159 if (dev->state != STATE_DEV_RUNNING) {
1160 dev_dbg(dev->dev, "fail, device is not running\n");
1165 dev_dbg(dev->dev, "fail, gadget is not bound\n");
1169 usb_gadget_vbus_draw(dev->gadget, 2 * value);
1172 spin_unlock_irqrestore(&dev->lock, flags);
1176 static void fill_ep_caps(struct usb_ep_caps *caps,
1177 struct usb_raw_ep_caps *raw_caps)
1179 raw_caps->type_control = caps->type_control;
1180 raw_caps->type_iso = caps->type_iso;
1181 raw_caps->type_bulk = caps->type_bulk;
1182 raw_caps->type_int = caps->type_int;
1183 raw_caps->dir_in = caps->dir_in;
1184 raw_caps->dir_out = caps->dir_out;
1187 static void fill_ep_limits(struct usb_ep *ep, struct usb_raw_ep_limits *limits)
1189 limits->maxpacket_limit = ep->maxpacket_limit;
1190 limits->max_streams = ep->max_streams;
1193 static int raw_ioctl_eps_info(struct raw_dev *dev, unsigned long value)
1196 unsigned long flags;
1197 struct usb_raw_eps_info *info;
1200 info = kzalloc(sizeof(*info), GFP_KERNEL);
1206 spin_lock_irqsave(&dev->lock, flags);
1207 if (dev->state != STATE_DEV_RUNNING) {
1208 dev_dbg(dev->dev, "fail, device is not running\n");
1210 spin_unlock_irqrestore(&dev->lock, flags);
1214 dev_dbg(dev->dev, "fail, gadget is not bound\n");
1216 spin_unlock_irqrestore(&dev->lock, flags);
1220 for (i = 0; i < dev->eps_num; i++) {
1222 strscpy(&info->eps[i].name[0], ep->ep->name,
1223 USB_RAW_EP_NAME_MAX);
1224 info->eps[i].addr = ep->addr;
1225 fill_ep_caps(&ep->ep->caps, &info->eps[i].caps);
1226 fill_ep_limits(ep->ep, &info->eps[i].limits);
1229 spin_unlock_irqrestore(&dev->lock, flags);
1231 if (copy_to_user((void __user *)value, info, sizeof(*info)))
1240 static long raw_ioctl(struct file *fd, unsigned int cmd, unsigned long value)
1242 struct raw_dev *dev = fd->private_data;
1249 case USB_RAW_IOCTL_INIT:
1250 ret = raw_ioctl_init(dev, value);
1252 case USB_RAW_IOCTL_RUN:
1253 ret = raw_ioctl_run(dev, value);
1255 case USB_RAW_IOCTL_EVENT_FETCH:
1256 ret = raw_ioctl_event_fetch(dev, value);
1258 case USB_RAW_IOCTL_EP0_WRITE:
1259 ret = raw_ioctl_ep0_write(dev, value);
1261 case USB_RAW_IOCTL_EP0_READ:
1262 ret = raw_ioctl_ep0_read(dev, value);
1264 case USB_RAW_IOCTL_EP_ENABLE:
1265 ret = raw_ioctl_ep_enable(dev, value);
1267 case USB_RAW_IOCTL_EP_DISABLE:
1268 ret = raw_ioctl_ep_disable(dev, value);
1270 case USB_RAW_IOCTL_EP_WRITE:
1271 ret = raw_ioctl_ep_write(dev, value);
1273 case USB_RAW_IOCTL_EP_READ:
1274 ret = raw_ioctl_ep_read(dev, value);
1276 case USB_RAW_IOCTL_CONFIGURE:
1277 ret = raw_ioctl_configure(dev, value);
1279 case USB_RAW_IOCTL_VBUS_DRAW:
1280 ret = raw_ioctl_vbus_draw(dev, value);
1282 case USB_RAW_IOCTL_EPS_INFO:
1283 ret = raw_ioctl_eps_info(dev, value);
1285 case USB_RAW_IOCTL_EP0_STALL:
1286 ret = raw_ioctl_ep0_stall(dev, value);
1288 case USB_RAW_IOCTL_EP_SET_HALT:
1289 ret = raw_ioctl_ep_set_clear_halt_wedge(
1290 dev, value, true, true);
1292 case USB_RAW_IOCTL_EP_CLEAR_HALT:
1293 ret = raw_ioctl_ep_set_clear_halt_wedge(
1294 dev, value, false, true);
1296 case USB_RAW_IOCTL_EP_SET_WEDGE:
1297 ret = raw_ioctl_ep_set_clear_halt_wedge(
1298 dev, value, true, false);
1307 /*----------------------------------------------------------------------*/
1309 static const struct file_operations raw_fops = {
1311 .unlocked_ioctl = raw_ioctl,
1312 .compat_ioctl = raw_ioctl,
1313 .release = raw_release,
1314 .llseek = no_llseek,
1317 static struct miscdevice raw_misc_device = {
1318 .minor = MISC_DYNAMIC_MINOR,
1319 .name = DRIVER_NAME,
1323 module_misc_device(raw_misc_device);