2 * uvc_gadget.c -- USB Video Class Gadget driver
4 * Copyright (C) 2009-2010
5 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/device.h>
16 #include <linux/errno.h>
18 #include <linux/list.h>
19 #include <linux/mutex.h>
20 #include <linux/string.h>
21 #include <linux/usb/ch9.h>
22 #include <linux/usb/gadget.h>
23 #include <linux/usb/video.h>
24 #include <linux/vmalloc.h>
25 #include <linux/wait.h>
27 #include <media/v4l2-dev.h>
28 #include <media/v4l2-event.h>
32 #include "uvc_video.h"
35 unsigned int uvc_gadget_trace_param;
37 /* --------------------------------------------------------------------------
38 * Function descriptors
41 /* string IDs are assigned dynamically */
43 #define UVC_STRING_CONTROL_IDX 0
44 #define UVC_STRING_STREAMING_IDX 1
46 static struct usb_string uvc_en_us_strings[] = {
47 [UVC_STRING_CONTROL_IDX].s = "UVC Camera",
48 [UVC_STRING_STREAMING_IDX].s = "Video Streaming",
52 static struct usb_gadget_strings uvc_stringtab = {
53 .language = 0x0409, /* en-us */
54 .strings = uvc_en_us_strings,
57 static struct usb_gadget_strings *uvc_function_strings[] = {
62 #define UVC_INTF_VIDEO_CONTROL 0
63 #define UVC_INTF_VIDEO_STREAMING 1
65 #define UVC_STATUS_MAX_PACKET_SIZE 16 /* 16 bytes status */
67 static struct usb_interface_assoc_descriptor uvc_iad = {
68 .bLength = sizeof(uvc_iad),
69 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
72 .bFunctionClass = USB_CLASS_VIDEO,
73 .bFunctionSubClass = UVC_SC_VIDEO_INTERFACE_COLLECTION,
74 .bFunctionProtocol = 0x00,
78 static struct usb_interface_descriptor uvc_control_intf = {
79 .bLength = USB_DT_INTERFACE_SIZE,
80 .bDescriptorType = USB_DT_INTERFACE,
81 .bInterfaceNumber = UVC_INTF_VIDEO_CONTROL,
82 .bAlternateSetting = 0,
84 .bInterfaceClass = USB_CLASS_VIDEO,
85 .bInterfaceSubClass = UVC_SC_VIDEOCONTROL,
86 .bInterfaceProtocol = 0x00,
90 static struct usb_endpoint_descriptor uvc_control_ep = {
91 .bLength = USB_DT_ENDPOINT_SIZE,
92 .bDescriptorType = USB_DT_ENDPOINT,
93 .bEndpointAddress = USB_DIR_IN,
94 .bmAttributes = USB_ENDPOINT_XFER_INT,
95 .wMaxPacketSize = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE),
99 static struct usb_ss_ep_comp_descriptor uvc_ss_control_comp = {
100 .bLength = sizeof(uvc_ss_control_comp),
101 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
102 /* The following 3 values can be tweaked if necessary. */
105 .wBytesPerInterval = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE),
108 static struct uvc_control_endpoint_descriptor uvc_control_cs_ep = {
109 .bLength = UVC_DT_CONTROL_ENDPOINT_SIZE,
110 .bDescriptorType = USB_DT_CS_ENDPOINT,
111 .bDescriptorSubType = UVC_EP_INTERRUPT,
112 .wMaxTransferSize = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE),
115 static struct usb_interface_descriptor uvc_streaming_intf_alt0 = {
116 .bLength = USB_DT_INTERFACE_SIZE,
117 .bDescriptorType = USB_DT_INTERFACE,
118 .bInterfaceNumber = UVC_INTF_VIDEO_STREAMING,
119 .bAlternateSetting = 0,
121 .bInterfaceClass = USB_CLASS_VIDEO,
122 .bInterfaceSubClass = UVC_SC_VIDEOSTREAMING,
123 .bInterfaceProtocol = 0x00,
127 static struct usb_interface_descriptor uvc_streaming_intf_alt1 = {
128 .bLength = USB_DT_INTERFACE_SIZE,
129 .bDescriptorType = USB_DT_INTERFACE,
130 .bInterfaceNumber = UVC_INTF_VIDEO_STREAMING,
131 .bAlternateSetting = 1,
133 .bInterfaceClass = USB_CLASS_VIDEO,
134 .bInterfaceSubClass = UVC_SC_VIDEOSTREAMING,
135 .bInterfaceProtocol = 0x00,
139 static struct usb_endpoint_descriptor uvc_fs_streaming_ep = {
140 .bLength = USB_DT_ENDPOINT_SIZE,
141 .bDescriptorType = USB_DT_ENDPOINT,
142 .bEndpointAddress = USB_DIR_IN,
143 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC
144 | USB_ENDPOINT_XFER_ISOC,
145 /* The wMaxPacketSize and bInterval values will be initialized from
150 static struct usb_endpoint_descriptor uvc_hs_streaming_ep = {
151 .bLength = USB_DT_ENDPOINT_SIZE,
152 .bDescriptorType = USB_DT_ENDPOINT,
153 .bEndpointAddress = USB_DIR_IN,
154 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC
155 | USB_ENDPOINT_XFER_ISOC,
156 /* The wMaxPacketSize and bInterval values will be initialized from
161 static struct usb_endpoint_descriptor uvc_ss_streaming_ep = {
162 .bLength = USB_DT_ENDPOINT_SIZE,
163 .bDescriptorType = USB_DT_ENDPOINT,
165 .bEndpointAddress = USB_DIR_IN,
166 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC
167 | USB_ENDPOINT_XFER_ISOC,
168 /* The wMaxPacketSize and bInterval values will be initialized from
173 static struct usb_ss_ep_comp_descriptor uvc_ss_streaming_comp = {
174 .bLength = sizeof(uvc_ss_streaming_comp),
175 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
176 /* The bMaxBurst, bmAttributes and wBytesPerInterval values will be
177 * initialized from module parameters.
181 static const struct usb_descriptor_header * const uvc_fs_streaming[] = {
182 (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
183 (struct usb_descriptor_header *) &uvc_fs_streaming_ep,
187 static const struct usb_descriptor_header * const uvc_hs_streaming[] = {
188 (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
189 (struct usb_descriptor_header *) &uvc_hs_streaming_ep,
193 static const struct usb_descriptor_header * const uvc_ss_streaming[] = {
194 (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
195 (struct usb_descriptor_header *) &uvc_ss_streaming_ep,
196 (struct usb_descriptor_header *) &uvc_ss_streaming_comp,
200 void uvc_set_trace_param(unsigned int trace)
202 uvc_gadget_trace_param = trace;
204 EXPORT_SYMBOL(uvc_set_trace_param);
206 /* --------------------------------------------------------------------------
211 uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req)
213 struct uvc_device *uvc = req->context;
214 struct v4l2_event v4l2_event;
215 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
217 if (uvc->event_setup_out) {
218 uvc->event_setup_out = 0;
220 memset(&v4l2_event, 0, sizeof(v4l2_event));
221 v4l2_event.type = UVC_EVENT_DATA;
222 uvc_event->data.length = req->actual;
223 memcpy(&uvc_event->data.data, req->buf, req->actual);
224 v4l2_event_queue(uvc->vdev, &v4l2_event);
229 uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
231 struct uvc_device *uvc = to_uvc(f);
232 struct v4l2_event v4l2_event;
233 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
235 /* printk(KERN_INFO "setup request %02x %02x value %04x index %04x %04x\n",
236 * ctrl->bRequestType, ctrl->bRequest, le16_to_cpu(ctrl->wValue),
237 * le16_to_cpu(ctrl->wIndex), le16_to_cpu(ctrl->wLength));
240 if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) {
241 INFO(f->config->cdev, "invalid request type\n");
245 /* Stall too big requests. */
246 if (le16_to_cpu(ctrl->wLength) > UVC_MAX_REQUEST_SIZE)
249 /* Tell the complete callback to generate an event for the next request
250 * that will be enqueued by UVCIOC_SEND_RESPONSE.
252 uvc->event_setup_out = !(ctrl->bRequestType & USB_DIR_IN);
253 uvc->event_length = le16_to_cpu(ctrl->wLength);
255 memset(&v4l2_event, 0, sizeof(v4l2_event));
256 v4l2_event.type = UVC_EVENT_SETUP;
257 memcpy(&uvc_event->req, ctrl, sizeof(uvc_event->req));
258 v4l2_event_queue(uvc->vdev, &v4l2_event);
263 void uvc_function_setup_continue(struct uvc_device *uvc)
265 struct usb_composite_dev *cdev = uvc->func.config->cdev;
267 usb_composite_setup_continue(cdev);
271 uvc_function_get_alt(struct usb_function *f, unsigned interface)
273 struct uvc_device *uvc = to_uvc(f);
275 INFO(f->config->cdev, "uvc_function_get_alt(%u)\n", interface);
277 if (interface == uvc->control_intf)
279 else if (interface != uvc->streaming_intf)
282 return uvc->state == UVC_STATE_STREAMING ? 1 : 0;
286 uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
288 struct uvc_device *uvc = to_uvc(f);
289 struct v4l2_event v4l2_event;
290 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
293 INFO(f->config->cdev, "uvc_function_set_alt(%u, %u)\n", interface, alt);
295 if (interface == uvc->control_intf) {
299 if (uvc->state == UVC_STATE_DISCONNECTED) {
300 memset(&v4l2_event, 0, sizeof(v4l2_event));
301 v4l2_event.type = UVC_EVENT_CONNECT;
302 uvc_event->speed = f->config->cdev->gadget->speed;
303 v4l2_event_queue(uvc->vdev, &v4l2_event);
305 uvc->state = UVC_STATE_CONNECTED;
311 if (interface != uvc->streaming_intf)
315 if (usb_endpoint_xfer_bulk(&uvc->desc.vs_ep))
316 return alt ? -EINVAL : 0;
321 if (uvc->state != UVC_STATE_STREAMING)
325 usb_ep_disable(uvc->video.ep);
327 memset(&v4l2_event, 0, sizeof(v4l2_event));
328 v4l2_event.type = UVC_EVENT_STREAMOFF;
329 v4l2_event_queue(uvc->vdev, &v4l2_event);
331 uvc->state = UVC_STATE_CONNECTED;
335 if (uvc->state != UVC_STATE_CONNECTED)
339 ret = config_ep_by_speed(f->config->cdev->gadget,
340 &(uvc->func), uvc->video.ep);
343 usb_ep_enable(uvc->video.ep);
346 memset(&v4l2_event, 0, sizeof(v4l2_event));
347 v4l2_event.type = UVC_EVENT_STREAMON;
348 v4l2_event_queue(uvc->vdev, &v4l2_event);
349 return USB_GADGET_DELAYED_STATUS;
357 uvc_function_disable(struct usb_function *f)
359 struct uvc_device *uvc = to_uvc(f);
360 struct v4l2_event v4l2_event;
362 INFO(f->config->cdev, "uvc_function_disable\n");
364 memset(&v4l2_event, 0, sizeof(v4l2_event));
365 v4l2_event.type = UVC_EVENT_DISCONNECT;
366 v4l2_event_queue(uvc->vdev, &v4l2_event);
368 uvc->state = UVC_STATE_DISCONNECTED;
371 /* --------------------------------------------------------------------------
372 * Connection / disconnection
376 uvc_function_connect(struct uvc_device *uvc)
378 struct usb_composite_dev *cdev = uvc->func.config->cdev;
381 if ((ret = usb_function_activate(&uvc->func)) < 0)
382 INFO(cdev, "UVC connect failed with %d\n", ret);
386 uvc_function_disconnect(struct uvc_device *uvc)
388 struct usb_composite_dev *cdev = uvc->func.config->cdev;
391 if ((ret = usb_function_deactivate(&uvc->func)) < 0)
392 INFO(cdev, "UVC disconnect failed with %d\n", ret);
395 /* --------------------------------------------------------------------------
396 * USB probe and disconnect
400 uvc_register_video(struct uvc_device *uvc)
402 struct usb_composite_dev *cdev = uvc->func.config->cdev;
403 struct video_device *video;
405 /* TODO reference counting. */
406 video = video_device_alloc();
410 video->v4l2_dev = &uvc->v4l2_dev;
411 video->fops = &uvc_v4l2_fops;
412 video->ioctl_ops = &uvc_v4l2_ioctl_ops;
413 video->release = video_device_release;
414 video->vfl_dir = VFL_DIR_TX;
415 strlcpy(video->name, cdev->gadget->name, sizeof(video->name));
418 video_set_drvdata(video, uvc);
420 return video_register_device(video, VFL_TYPE_GRABBER, -1);
423 #define UVC_COPY_DESCRIPTOR(mem, dst, desc) \
425 memcpy(mem, desc, (desc)->bLength); \
427 mem += (desc)->bLength; \
430 #define UVC_COPY_DESCRIPTORS(mem, dst, src) \
432 const struct usb_descriptor_header * const *__src; \
433 for (__src = src; *__src; ++__src) { \
434 memcpy(mem, *__src, (*__src)->bLength); \
436 mem += (*__src)->bLength; \
440 static struct usb_descriptor_header **
441 uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
443 struct uvc_input_header_descriptor *uvc_streaming_header;
444 struct uvc_header_descriptor *uvc_control_header;
445 const struct uvc_descriptor_header * const *uvc_control_desc;
446 const struct uvc_descriptor_header * const *uvc_streaming_cls;
447 const struct usb_descriptor_header * const *uvc_streaming_std;
448 const struct usb_descriptor_header * const *src;
449 struct usb_descriptor_header **dst;
450 struct usb_descriptor_header **hdr;
451 unsigned int control_size;
452 unsigned int streaming_size;
458 case USB_SPEED_SUPER:
459 uvc_control_desc = uvc->desc.ss_control;
460 uvc_streaming_cls = uvc->desc.ss_streaming;
461 uvc_streaming_std = uvc_ss_streaming;
465 uvc_control_desc = uvc->desc.fs_control;
466 uvc_streaming_cls = uvc->desc.hs_streaming;
467 uvc_streaming_std = uvc_hs_streaming;
472 uvc_control_desc = uvc->desc.fs_control;
473 uvc_streaming_cls = uvc->desc.fs_streaming;
474 uvc_streaming_std = uvc_fs_streaming;
478 /* Descriptors layout
482 * Class-specific UVC control descriptors
485 * uvc_ss_control_comp (for SS only)
486 * uvc_streaming_intf_alt0
487 * Class-specific UVC streaming descriptors
488 * uvc_{fs|hs}_streaming
491 /* Count descriptors and compute their size. */
494 bytes = uvc_iad.bLength + uvc_control_intf.bLength
495 + uvc_control_ep.bLength + uvc_control_cs_ep.bLength
496 + uvc_streaming_intf_alt0.bLength;
498 if (speed == USB_SPEED_SUPER) {
499 bytes += uvc_ss_control_comp.bLength;
505 for (src = (const struct usb_descriptor_header **)uvc_control_desc;
507 control_size += (*src)->bLength;
508 bytes += (*src)->bLength;
511 for (src = (const struct usb_descriptor_header **)uvc_streaming_cls;
513 streaming_size += (*src)->bLength;
514 bytes += (*src)->bLength;
517 for (src = uvc_streaming_std; *src; ++src) {
518 bytes += (*src)->bLength;
522 mem = kmalloc((n_desc + 1) * sizeof(*src) + bytes, GFP_KERNEL);
528 mem += (n_desc + 1) * sizeof(*src);
530 /* Copy the descriptors. */
531 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_iad);
532 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_intf);
534 uvc_control_header = mem;
535 UVC_COPY_DESCRIPTORS(mem, dst,
536 (const struct usb_descriptor_header **)uvc_control_desc);
537 uvc_control_header->wTotalLength = cpu_to_le16(control_size);
538 uvc_control_header->bInCollection = 1;
539 uvc_control_header->baInterfaceNr[0] = uvc->streaming_intf;
541 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_ep);
542 if (speed == USB_SPEED_SUPER)
543 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_ss_control_comp);
545 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_cs_ep);
546 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_streaming_intf_alt0);
548 uvc_streaming_header = mem;
549 UVC_COPY_DESCRIPTORS(mem, dst,
550 (const struct usb_descriptor_header**)uvc_streaming_cls);
551 uvc_streaming_header->wTotalLength = cpu_to_le16(streaming_size);
552 uvc_streaming_header->bEndpointAddress = uvc->video.ep->address;
554 UVC_COPY_DESCRIPTORS(mem, dst, uvc_streaming_std);
561 uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
563 struct usb_composite_dev *cdev = c->cdev;
564 struct uvc_device *uvc = to_uvc(f);
565 struct usb_string *us;
566 unsigned int max_packet_mult;
567 unsigned int max_packet_size;
569 struct f_uvc_opts *opts;
572 INFO(cdev, "uvc_function_bind\n");
574 opts = to_f_uvc_opts(f->fi);
575 /* Sanity check the streaming endpoint module parameters.
577 opts->streaming_interval = clamp(opts->streaming_interval, 1U, 16U);
578 opts->streaming_maxpacket = clamp(opts->streaming_maxpacket, 1U, 3072U);
579 opts->streaming_maxburst = min(opts->streaming_maxburst, 15U);
581 /* Fill in the FS/HS/SS Video Streaming specific descriptors from the
584 * NOTE: We assume that the user knows what they are doing and won't
585 * give parameters that their UDC doesn't support.
587 if (opts->streaming_maxpacket <= 1024) {
589 max_packet_size = opts->streaming_maxpacket;
590 } else if (opts->streaming_maxpacket <= 2048) {
592 max_packet_size = opts->streaming_maxpacket / 2;
595 max_packet_size = opts->streaming_maxpacket / 3;
598 uvc_fs_streaming_ep.wMaxPacketSize =
599 cpu_to_le16(min(opts->streaming_maxpacket, 1023U));
600 uvc_fs_streaming_ep.bInterval = opts->streaming_interval;
602 uvc_hs_streaming_ep.wMaxPacketSize =
603 cpu_to_le16(max_packet_size | ((max_packet_mult - 1) << 11));
604 uvc_hs_streaming_ep.bInterval = opts->streaming_interval;
606 uvc_ss_streaming_ep.wMaxPacketSize = cpu_to_le16(max_packet_size);
607 uvc_ss_streaming_ep.bInterval = opts->streaming_interval;
608 uvc_ss_streaming_comp.bmAttributes = max_packet_mult - 1;
609 uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst;
610 uvc_ss_streaming_comp.wBytesPerInterval =
611 cpu_to_le16(max_packet_size * max_packet_mult *
612 opts->streaming_maxburst);
614 /* Allocate endpoints. */
615 ep = usb_ep_autoconfig(cdev->gadget, &uvc_control_ep);
617 INFO(cdev, "Unable to allocate control EP\n");
620 uvc->control_ep = ep;
621 ep->driver_data = uvc;
623 if (gadget_is_superspeed(c->cdev->gadget))
624 ep = usb_ep_autoconfig_ss(cdev->gadget, &uvc_ss_streaming_ep,
625 &uvc_ss_streaming_comp);
626 else if (gadget_is_dualspeed(cdev->gadget))
627 ep = usb_ep_autoconfig(cdev->gadget, &uvc_hs_streaming_ep);
629 ep = usb_ep_autoconfig(cdev->gadget, &uvc_fs_streaming_ep);
632 INFO(cdev, "Unable to allocate streaming EP\n");
636 ep->driver_data = uvc;
638 uvc_fs_streaming_ep.bEndpointAddress = uvc->video.ep->address;
639 uvc_hs_streaming_ep.bEndpointAddress = uvc->video.ep->address;
640 uvc_ss_streaming_ep.bEndpointAddress = uvc->video.ep->address;
642 us = usb_gstrings_attach(cdev, uvc_function_strings,
643 ARRAY_SIZE(uvc_en_us_strings));
648 uvc_iad.iFunction = us[UVC_STRING_CONTROL_IDX].id;
649 uvc_control_intf.iInterface = us[UVC_STRING_CONTROL_IDX].id;
650 ret = us[UVC_STRING_STREAMING_IDX].id;
651 uvc_streaming_intf_alt0.iInterface = ret;
652 uvc_streaming_intf_alt1.iInterface = ret;
654 /* Allocate interface IDs. */
655 if ((ret = usb_interface_id(c, f)) < 0)
657 uvc_iad.bFirstInterface = ret;
658 uvc_control_intf.bInterfaceNumber = ret;
659 uvc->control_intf = ret;
661 if ((ret = usb_interface_id(c, f)) < 0)
663 uvc_streaming_intf_alt0.bInterfaceNumber = ret;
664 uvc_streaming_intf_alt1.bInterfaceNumber = ret;
665 uvc->streaming_intf = ret;
667 /* Copy descriptors */
668 f->fs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_FULL);
669 if (gadget_is_dualspeed(cdev->gadget))
670 f->hs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_HIGH);
671 if (gadget_is_superspeed(c->cdev->gadget))
672 f->ss_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_SUPER);
674 /* Preallocate control endpoint request. */
675 uvc->control_req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL);
676 uvc->control_buf = kmalloc(UVC_MAX_REQUEST_SIZE, GFP_KERNEL);
677 if (uvc->control_req == NULL || uvc->control_buf == NULL) {
682 uvc->control_req->buf = uvc->control_buf;
683 uvc->control_req->complete = uvc_function_ep0_complete;
684 uvc->control_req->context = uvc;
686 /* Avoid letting this gadget enumerate until the userspace server is
689 if ((ret = usb_function_deactivate(f)) < 0)
692 if (v4l2_device_register(&cdev->gadget->dev, &uvc->v4l2_dev)) {
693 printk(KERN_INFO "v4l2_device_register failed\n");
697 /* Initialise video. */
698 ret = uvcg_video_init(&uvc->video);
702 /* Register a V4L2 device. */
703 ret = uvc_register_video(uvc);
705 printk(KERN_INFO "Unable to register video device\n");
712 v4l2_device_unregister(&uvc->v4l2_dev);
714 video_device_release(uvc->vdev);
717 uvc->control_ep->driver_data = NULL;
719 uvc->video.ep->driver_data = NULL;
721 if (uvc->control_req)
722 usb_ep_free_request(cdev->gadget->ep0, uvc->control_req);
723 kfree(uvc->control_buf);
725 usb_free_all_descriptors(f);
729 /* --------------------------------------------------------------------------
730 * USB gadget function
733 static void uvc_free_inst(struct usb_function_instance *f)
735 struct f_uvc_opts *opts = to_f_uvc_opts(f);
740 static struct usb_function_instance *uvc_alloc_inst(void)
742 struct f_uvc_opts *opts;
744 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
746 return ERR_PTR(-ENOMEM);
747 opts->func_inst.free_func_inst = uvc_free_inst;
749 return &opts->func_inst;
752 static void uvc_free(struct usb_function *f)
754 struct uvc_device *uvc = to_uvc(f);
759 static void uvc_unbind(struct usb_configuration *c, struct usb_function *f)
761 struct usb_composite_dev *cdev = c->cdev;
762 struct uvc_device *uvc = to_uvc(f);
764 INFO(cdev, "%s\n", __func__);
766 video_unregister_device(uvc->vdev);
767 v4l2_device_unregister(&uvc->v4l2_dev);
768 uvc->control_ep->driver_data = NULL;
769 uvc->video.ep->driver_data = NULL;
771 usb_ep_free_request(cdev->gadget->ep0, uvc->control_req);
772 kfree(uvc->control_buf);
774 usb_free_all_descriptors(f);
777 static struct usb_function *uvc_alloc(struct usb_function_instance *fi)
779 struct uvc_device *uvc;
780 struct f_uvc_opts *opts;
782 uvc = kzalloc(sizeof(*uvc), GFP_KERNEL);
784 return ERR_PTR(-ENOMEM);
786 uvc->state = UVC_STATE_DISCONNECTED;
787 opts = to_f_uvc_opts(fi);
789 uvc->desc.fs_control = opts->fs_control;
790 uvc->desc.ss_control = opts->ss_control;
791 uvc->desc.fs_streaming = opts->fs_streaming;
792 uvc->desc.hs_streaming = opts->hs_streaming;
793 uvc->desc.ss_streaming = opts->ss_streaming;
795 /* Register the function. */
796 uvc->func.name = "uvc";
797 uvc->func.bind = uvc_function_bind;
798 uvc->func.unbind = uvc_unbind;
799 uvc->func.get_alt = uvc_function_get_alt;
800 uvc->func.set_alt = uvc_function_set_alt;
801 uvc->func.disable = uvc_function_disable;
802 uvc->func.setup = uvc_function_setup;
803 uvc->func.free_func = uvc_free;
808 DECLARE_USB_FUNCTION_INIT(uvc, uvc_alloc_inst, uvc_alloc);
809 MODULE_LICENSE("GPL");
810 MODULE_AUTHOR("Laurent Pinchart");