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path: root/drivers/usb/gadget/function/f_uvc.c
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Diffstat (limited to 'drivers/usb/gadget/function/f_uvc.c')
-rw-r--r--drivers/usb/gadget/function/f_uvc.c836
1 files changed, 836 insertions, 0 deletions
diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
new file mode 100644
index 000000000000..e2a1f50bd93c
--- /dev/null
+++ b/drivers/usb/gadget/function/f_uvc.c
@@ -0,0 +1,836 @@
1/*
2 * uvc_gadget.c -- USB Video Class Gadget driver
3 *
4 * Copyright (C) 2009-2010
5 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
6 *
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.
11 */
12
13#include <linux/kernel.h>
14#include <linux/device.h>
15#include <linux/errno.h>
16#include <linux/fs.h>
17#include <linux/list.h>
18#include <linux/mutex.h>
19#include <linux/string.h>
20#include <linux/usb/ch9.h>
21#include <linux/usb/gadget.h>
22#include <linux/usb/video.h>
23#include <linux/vmalloc.h>
24#include <linux/wait.h>
25
26#include <media/v4l2-dev.h>
27#include <media/v4l2-event.h>
28
29#include "uvc.h"
30
31unsigned int uvc_gadget_trace_param;
32
33/*-------------------------------------------------------------------------*/
34
35/* module parameters specific to the Video streaming endpoint */
36static unsigned int streaming_interval = 1;
37module_param(streaming_interval, uint, S_IRUGO|S_IWUSR);
38MODULE_PARM_DESC(streaming_interval, "1 - 16");
39
40static unsigned int streaming_maxpacket = 1024;
41module_param(streaming_maxpacket, uint, S_IRUGO|S_IWUSR);
42MODULE_PARM_DESC(streaming_maxpacket, "1 - 1023 (FS), 1 - 3072 (hs/ss)");
43
44static unsigned int streaming_maxburst;
45module_param(streaming_maxburst, uint, S_IRUGO|S_IWUSR);
46MODULE_PARM_DESC(streaming_maxburst, "0 - 15 (ss only)");
47
48/* --------------------------------------------------------------------------
49 * Function descriptors
50 */
51
52/* string IDs are assigned dynamically */
53
54#define UVC_STRING_CONTROL_IDX 0
55#define UVC_STRING_STREAMING_IDX 1
56
57static struct usb_string uvc_en_us_strings[] = {
58 [UVC_STRING_CONTROL_IDX].s = "UVC Camera",
59 [UVC_STRING_STREAMING_IDX].s = "Video Streaming",
60 { }
61};
62
63static struct usb_gadget_strings uvc_stringtab = {
64 .language = 0x0409, /* en-us */
65 .strings = uvc_en_us_strings,
66};
67
68static struct usb_gadget_strings *uvc_function_strings[] = {
69 &uvc_stringtab,
70 NULL,
71};
72
73#define UVC_INTF_VIDEO_CONTROL 0
74#define UVC_INTF_VIDEO_STREAMING 1
75
76#define UVC_STATUS_MAX_PACKET_SIZE 16 /* 16 bytes status */
77
78static struct usb_interface_assoc_descriptor uvc_iad __initdata = {
79 .bLength = sizeof(uvc_iad),
80 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
81 .bFirstInterface = 0,
82 .bInterfaceCount = 2,
83 .bFunctionClass = USB_CLASS_VIDEO,
84 .bFunctionSubClass = UVC_SC_VIDEO_INTERFACE_COLLECTION,
85 .bFunctionProtocol = 0x00,
86 .iFunction = 0,
87};
88
89static struct usb_interface_descriptor uvc_control_intf __initdata = {
90 .bLength = USB_DT_INTERFACE_SIZE,
91 .bDescriptorType = USB_DT_INTERFACE,
92 .bInterfaceNumber = UVC_INTF_VIDEO_CONTROL,
93 .bAlternateSetting = 0,
94 .bNumEndpoints = 1,
95 .bInterfaceClass = USB_CLASS_VIDEO,
96 .bInterfaceSubClass = UVC_SC_VIDEOCONTROL,
97 .bInterfaceProtocol = 0x00,
98 .iInterface = 0,
99};
100
101static struct usb_endpoint_descriptor uvc_control_ep __initdata = {
102 .bLength = USB_DT_ENDPOINT_SIZE,
103 .bDescriptorType = USB_DT_ENDPOINT,
104 .bEndpointAddress = USB_DIR_IN,
105 .bmAttributes = USB_ENDPOINT_XFER_INT,
106 .wMaxPacketSize = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE),
107 .bInterval = 8,
108};
109
110static struct usb_ss_ep_comp_descriptor uvc_ss_control_comp __initdata = {
111 .bLength = sizeof(uvc_ss_control_comp),
112 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
113 /* The following 3 values can be tweaked if necessary. */
114 .bMaxBurst = 0,
115 .bmAttributes = 0,
116 .wBytesPerInterval = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE),
117};
118
119static struct uvc_control_endpoint_descriptor uvc_control_cs_ep __initdata = {
120 .bLength = UVC_DT_CONTROL_ENDPOINT_SIZE,
121 .bDescriptorType = USB_DT_CS_ENDPOINT,
122 .bDescriptorSubType = UVC_EP_INTERRUPT,
123 .wMaxTransferSize = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE),
124};
125
126static struct usb_interface_descriptor uvc_streaming_intf_alt0 __initdata = {
127 .bLength = USB_DT_INTERFACE_SIZE,
128 .bDescriptorType = USB_DT_INTERFACE,
129 .bInterfaceNumber = UVC_INTF_VIDEO_STREAMING,
130 .bAlternateSetting = 0,
131 .bNumEndpoints = 0,
132 .bInterfaceClass = USB_CLASS_VIDEO,
133 .bInterfaceSubClass = UVC_SC_VIDEOSTREAMING,
134 .bInterfaceProtocol = 0x00,
135 .iInterface = 0,
136};
137
138static struct usb_interface_descriptor uvc_streaming_intf_alt1 __initdata = {
139 .bLength = USB_DT_INTERFACE_SIZE,
140 .bDescriptorType = USB_DT_INTERFACE,
141 .bInterfaceNumber = UVC_INTF_VIDEO_STREAMING,
142 .bAlternateSetting = 1,
143 .bNumEndpoints = 1,
144 .bInterfaceClass = USB_CLASS_VIDEO,
145 .bInterfaceSubClass = UVC_SC_VIDEOSTREAMING,
146 .bInterfaceProtocol = 0x00,
147 .iInterface = 0,
148};
149
150static struct usb_endpoint_descriptor uvc_fs_streaming_ep __initdata = {
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
157 * module parameters.
158 */
159};
160
161static struct usb_endpoint_descriptor uvc_hs_streaming_ep __initdata = {
162 .bLength = USB_DT_ENDPOINT_SIZE,
163 .bDescriptorType = USB_DT_ENDPOINT,
164 .bEndpointAddress = USB_DIR_IN,
165 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC
166 | USB_ENDPOINT_XFER_ISOC,
167 /* The wMaxPacketSize and bInterval values will be initialized from
168 * module parameters.
169 */
170};
171
172static struct usb_endpoint_descriptor uvc_ss_streaming_ep __initdata = {
173 .bLength = USB_DT_ENDPOINT_SIZE,
174 .bDescriptorType = USB_DT_ENDPOINT,
175
176 .bEndpointAddress = USB_DIR_IN,
177 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC
178 | USB_ENDPOINT_XFER_ISOC,
179 /* The wMaxPacketSize and bInterval values will be initialized from
180 * module parameters.
181 */
182};
183
184static struct usb_ss_ep_comp_descriptor uvc_ss_streaming_comp __initdata = {
185 .bLength = sizeof(uvc_ss_streaming_comp),
186 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
187 /* The bMaxBurst, bmAttributes and wBytesPerInterval values will be
188 * initialized from module parameters.
189 */
190};
191
192static const struct usb_descriptor_header * const uvc_fs_streaming[] = {
193 (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
194 (struct usb_descriptor_header *) &uvc_fs_streaming_ep,
195 NULL,
196};
197
198static const struct usb_descriptor_header * const uvc_hs_streaming[] = {
199 (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
200 (struct usb_descriptor_header *) &uvc_hs_streaming_ep,
201 NULL,
202};
203
204static const struct usb_descriptor_header * const uvc_ss_streaming[] = {
205 (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
206 (struct usb_descriptor_header *) &uvc_ss_streaming_ep,
207 (struct usb_descriptor_header *) &uvc_ss_streaming_comp,
208 NULL,
209};
210
211/* --------------------------------------------------------------------------
212 * Control requests
213 */
214
215static void
216uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req)
217{
218 struct uvc_device *uvc = req->context;
219 struct v4l2_event v4l2_event;
220 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
221
222 if (uvc->event_setup_out) {
223 uvc->event_setup_out = 0;
224
225 memset(&v4l2_event, 0, sizeof(v4l2_event));
226 v4l2_event.type = UVC_EVENT_DATA;
227 uvc_event->data.length = req->actual;
228 memcpy(&uvc_event->data.data, req->buf, req->actual);
229 v4l2_event_queue(uvc->vdev, &v4l2_event);
230 }
231}
232
233static int
234uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
235{
236 struct uvc_device *uvc = to_uvc(f);
237 struct v4l2_event v4l2_event;
238 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
239
240 /* printk(KERN_INFO "setup request %02x %02x value %04x index %04x %04x\n",
241 * ctrl->bRequestType, ctrl->bRequest, le16_to_cpu(ctrl->wValue),
242 * le16_to_cpu(ctrl->wIndex), le16_to_cpu(ctrl->wLength));
243 */
244
245 if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) {
246 INFO(f->config->cdev, "invalid request type\n");
247 return -EINVAL;
248 }
249
250 /* Stall too big requests. */
251 if (le16_to_cpu(ctrl->wLength) > UVC_MAX_REQUEST_SIZE)
252 return -EINVAL;
253
254 memset(&v4l2_event, 0, sizeof(v4l2_event));
255 v4l2_event.type = UVC_EVENT_SETUP;
256 memcpy(&uvc_event->req, ctrl, sizeof(uvc_event->req));
257 v4l2_event_queue(uvc->vdev, &v4l2_event);
258
259 return 0;
260}
261
262void uvc_function_setup_continue(struct uvc_device *uvc)
263{
264 struct usb_composite_dev *cdev = uvc->func.config->cdev;
265
266 usb_composite_setup_continue(cdev);
267}
268
269static int
270uvc_function_get_alt(struct usb_function *f, unsigned interface)
271{
272 struct uvc_device *uvc = to_uvc(f);
273
274 INFO(f->config->cdev, "uvc_function_get_alt(%u)\n", interface);
275
276 if (interface == uvc->control_intf)
277 return 0;
278 else if (interface != uvc->streaming_intf)
279 return -EINVAL;
280 else
281 return uvc->state == UVC_STATE_STREAMING ? 1 : 0;
282}
283
284static int
285uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
286{
287 struct uvc_device *uvc = to_uvc(f);
288 struct v4l2_event v4l2_event;
289 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
290 int ret;
291
292 INFO(f->config->cdev, "uvc_function_set_alt(%u, %u)\n", interface, alt);
293
294 if (interface == uvc->control_intf) {
295 if (alt)
296 return -EINVAL;
297
298 if (uvc->state == UVC_STATE_DISCONNECTED) {
299 memset(&v4l2_event, 0, sizeof(v4l2_event));
300 v4l2_event.type = UVC_EVENT_CONNECT;
301 uvc_event->speed = f->config->cdev->gadget->speed;
302 v4l2_event_queue(uvc->vdev, &v4l2_event);
303
304 uvc->state = UVC_STATE_CONNECTED;
305 }
306
307 return 0;
308 }
309
310 if (interface != uvc->streaming_intf)
311 return -EINVAL;
312
313 /* TODO
314 if (usb_endpoint_xfer_bulk(&uvc->desc.vs_ep))
315 return alt ? -EINVAL : 0;
316 */
317
318 switch (alt) {
319 case 0:
320 if (uvc->state != UVC_STATE_STREAMING)
321 return 0;
322
323 if (uvc->video.ep)
324 usb_ep_disable(uvc->video.ep);
325
326 memset(&v4l2_event, 0, sizeof(v4l2_event));
327 v4l2_event.type = UVC_EVENT_STREAMOFF;
328 v4l2_event_queue(uvc->vdev, &v4l2_event);
329
330 uvc->state = UVC_STATE_CONNECTED;
331 return 0;
332
333 case 1:
334 if (uvc->state != UVC_STATE_CONNECTED)
335 return 0;
336
337 if (uvc->video.ep) {
338 ret = config_ep_by_speed(f->config->cdev->gadget,
339 &(uvc->func), uvc->video.ep);
340 if (ret)
341 return ret;
342 usb_ep_enable(uvc->video.ep);
343 }
344
345 memset(&v4l2_event, 0, sizeof(v4l2_event));
346 v4l2_event.type = UVC_EVENT_STREAMON;
347 v4l2_event_queue(uvc->vdev, &v4l2_event);
348 return USB_GADGET_DELAYED_STATUS;
349
350 default:
351 return -EINVAL;
352 }
353}
354
355static void
356uvc_function_disable(struct usb_function *f)
357{
358 struct uvc_device *uvc = to_uvc(f);
359 struct v4l2_event v4l2_event;
360
361 INFO(f->config->cdev, "uvc_function_disable\n");
362
363 memset(&v4l2_event, 0, sizeof(v4l2_event));
364 v4l2_event.type = UVC_EVENT_DISCONNECT;
365 v4l2_event_queue(uvc->vdev, &v4l2_event);
366
367 uvc->state = UVC_STATE_DISCONNECTED;
368}
369
370/* --------------------------------------------------------------------------
371 * Connection / disconnection
372 */
373
374void
375uvc_function_connect(struct uvc_device *uvc)
376{
377 struct usb_composite_dev *cdev = uvc->func.config->cdev;
378 int ret;
379
380 if ((ret = usb_function_activate(&uvc->func)) < 0)
381 INFO(cdev, "UVC connect failed with %d\n", ret);
382}
383
384void
385uvc_function_disconnect(struct uvc_device *uvc)
386{
387 struct usb_composite_dev *cdev = uvc->func.config->cdev;
388 int ret;
389
390 if ((ret = usb_function_deactivate(&uvc->func)) < 0)
391 INFO(cdev, "UVC disconnect failed with %d\n", ret);
392}
393
394/* --------------------------------------------------------------------------
395 * USB probe and disconnect
396 */
397
398static int
399uvc_register_video(struct uvc_device *uvc)
400{
401 struct usb_composite_dev *cdev = uvc->func.config->cdev;
402 struct video_device *video;
403
404 /* TODO reference counting. */
405 video = video_device_alloc();
406 if (video == NULL)
407 return -ENOMEM;
408
409 video->v4l2_dev = &uvc->v4l2_dev;
410 video->fops = &uvc_v4l2_fops;
411 video->release = video_device_release;
412 strlcpy(video->name, cdev->gadget->name, sizeof(video->name));
413
414 uvc->vdev = video;
415 video_set_drvdata(video, uvc);
416
417 return video_register_device(video, VFL_TYPE_GRABBER, -1);
418}
419
420#define UVC_COPY_DESCRIPTOR(mem, dst, desc) \
421 do { \
422 memcpy(mem, desc, (desc)->bLength); \
423 *(dst)++ = mem; \
424 mem += (desc)->bLength; \
425 } while (0);
426
427#define UVC_COPY_DESCRIPTORS(mem, dst, src) \
428 do { \
429 const struct usb_descriptor_header * const *__src; \
430 for (__src = src; *__src; ++__src) { \
431 memcpy(mem, *__src, (*__src)->bLength); \
432 *dst++ = mem; \
433 mem += (*__src)->bLength; \
434 } \
435 } while (0)
436
437static struct usb_descriptor_header ** __init
438uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
439{
440 struct uvc_input_header_descriptor *uvc_streaming_header;
441 struct uvc_header_descriptor *uvc_control_header;
442 const struct uvc_descriptor_header * const *uvc_control_desc;
443 const struct uvc_descriptor_header * const *uvc_streaming_cls;
444 const struct usb_descriptor_header * const *uvc_streaming_std;
445 const struct usb_descriptor_header * const *src;
446 struct usb_descriptor_header **dst;
447 struct usb_descriptor_header **hdr;
448 unsigned int control_size;
449 unsigned int streaming_size;
450 unsigned int n_desc;
451 unsigned int bytes;
452 void *mem;
453
454 switch (speed) {
455 case USB_SPEED_SUPER:
456 uvc_control_desc = uvc->desc.ss_control;
457 uvc_streaming_cls = uvc->desc.ss_streaming;
458 uvc_streaming_std = uvc_ss_streaming;
459 break;
460
461 case USB_SPEED_HIGH:
462 uvc_control_desc = uvc->desc.fs_control;
463 uvc_streaming_cls = uvc->desc.hs_streaming;
464 uvc_streaming_std = uvc_hs_streaming;
465 break;
466
467 case USB_SPEED_FULL:
468 default:
469 uvc_control_desc = uvc->desc.fs_control;
470 uvc_streaming_cls = uvc->desc.fs_streaming;
471 uvc_streaming_std = uvc_fs_streaming;
472 break;
473 }
474
475 /* Descriptors layout
476 *
477 * uvc_iad
478 * uvc_control_intf
479 * Class-specific UVC control descriptors
480 * uvc_control_ep
481 * uvc_control_cs_ep
482 * uvc_ss_control_comp (for SS only)
483 * uvc_streaming_intf_alt0
484 * Class-specific UVC streaming descriptors
485 * uvc_{fs|hs}_streaming
486 */
487
488 /* Count descriptors and compute their size. */
489 control_size = 0;
490 streaming_size = 0;
491 bytes = uvc_iad.bLength + uvc_control_intf.bLength
492 + uvc_control_ep.bLength + uvc_control_cs_ep.bLength
493 + uvc_streaming_intf_alt0.bLength;
494
495 if (speed == USB_SPEED_SUPER) {
496 bytes += uvc_ss_control_comp.bLength;
497 n_desc = 6;
498 } else {
499 n_desc = 5;
500 }
501
502 for (src = (const struct usb_descriptor_header **)uvc_control_desc;
503 *src; ++src) {
504 control_size += (*src)->bLength;
505 bytes += (*src)->bLength;
506 n_desc++;
507 }
508 for (src = (const struct usb_descriptor_header **)uvc_streaming_cls;
509 *src; ++src) {
510 streaming_size += (*src)->bLength;
511 bytes += (*src)->bLength;
512 n_desc++;
513 }
514 for (src = uvc_streaming_std; *src; ++src) {
515 bytes += (*src)->bLength;
516 n_desc++;
517 }
518
519 mem = kmalloc((n_desc + 1) * sizeof(*src) + bytes, GFP_KERNEL);
520 if (mem == NULL)
521 return NULL;
522
523 hdr = mem;
524 dst = mem;
525 mem += (n_desc + 1) * sizeof(*src);
526
527 /* Copy the descriptors. */
528 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_iad);
529 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_intf);
530
531 uvc_control_header = mem;
532 UVC_COPY_DESCRIPTORS(mem, dst,
533 (const struct usb_descriptor_header **)uvc_control_desc);
534 uvc_control_header->wTotalLength = cpu_to_le16(control_size);
535 uvc_control_header->bInCollection = 1;
536 uvc_control_header->baInterfaceNr[0] = uvc->streaming_intf;
537
538 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_ep);
539 if (speed == USB_SPEED_SUPER)
540 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_ss_control_comp);
541
542 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_cs_ep);
543 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_streaming_intf_alt0);
544
545 uvc_streaming_header = mem;
546 UVC_COPY_DESCRIPTORS(mem, dst,
547 (const struct usb_descriptor_header**)uvc_streaming_cls);
548 uvc_streaming_header->wTotalLength = cpu_to_le16(streaming_size);
549 uvc_streaming_header->bEndpointAddress = uvc->video.ep->address;
550
551 UVC_COPY_DESCRIPTORS(mem, dst, uvc_streaming_std);
552
553 *dst = NULL;
554 return hdr;
555}
556
557static void
558uvc_function_unbind(struct usb_configuration *c, struct usb_function *f)
559{
560 struct usb_composite_dev *cdev = c->cdev;
561 struct uvc_device *uvc = to_uvc(f);
562
563 INFO(cdev, "uvc_function_unbind\n");
564
565 video_unregister_device(uvc->vdev);
566 v4l2_device_unregister(&uvc->v4l2_dev);
567 uvc->control_ep->driver_data = NULL;
568 uvc->video.ep->driver_data = NULL;
569
570 uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id = 0;
571 usb_ep_free_request(cdev->gadget->ep0, uvc->control_req);
572 kfree(uvc->control_buf);
573
574 usb_free_all_descriptors(f);
575
576 kfree(uvc);
577}
578
579static int __init
580uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
581{
582 struct usb_composite_dev *cdev = c->cdev;
583 struct uvc_device *uvc = to_uvc(f);
584 unsigned int max_packet_mult;
585 unsigned int max_packet_size;
586 struct usb_ep *ep;
587 int ret = -EINVAL;
588
589 INFO(cdev, "uvc_function_bind\n");
590
591 /* Sanity check the streaming endpoint module parameters.
592 */
593 streaming_interval = clamp(streaming_interval, 1U, 16U);
594 streaming_maxpacket = clamp(streaming_maxpacket, 1U, 3072U);
595 streaming_maxburst = min(streaming_maxburst, 15U);
596
597 /* Fill in the FS/HS/SS Video Streaming specific descriptors from the
598 * module parameters.
599 *
600 * NOTE: We assume that the user knows what they are doing and won't
601 * give parameters that their UDC doesn't support.
602 */
603 if (streaming_maxpacket <= 1024) {
604 max_packet_mult = 1;
605 max_packet_size = streaming_maxpacket;
606 } else if (streaming_maxpacket <= 2048) {
607 max_packet_mult = 2;
608 max_packet_size = streaming_maxpacket / 2;
609 } else {
610 max_packet_mult = 3;
611 max_packet_size = streaming_maxpacket / 3;
612 }
613
614 uvc_fs_streaming_ep.wMaxPacketSize = min(streaming_maxpacket, 1023U);
615 uvc_fs_streaming_ep.bInterval = streaming_interval;
616
617 uvc_hs_streaming_ep.wMaxPacketSize = max_packet_size;
618 uvc_hs_streaming_ep.wMaxPacketSize |= ((max_packet_mult - 1) << 11);
619 uvc_hs_streaming_ep.bInterval = streaming_interval;
620
621 uvc_ss_streaming_ep.wMaxPacketSize = max_packet_size;
622 uvc_ss_streaming_ep.bInterval = streaming_interval;
623 uvc_ss_streaming_comp.bmAttributes = max_packet_mult - 1;
624 uvc_ss_streaming_comp.bMaxBurst = streaming_maxburst;
625 uvc_ss_streaming_comp.wBytesPerInterval =
626 max_packet_size * max_packet_mult * streaming_maxburst;
627
628 /* Allocate endpoints. */
629 ep = usb_ep_autoconfig(cdev->gadget, &uvc_control_ep);
630 if (!ep) {
631 INFO(cdev, "Unable to allocate control EP\n");
632 goto error;
633 }
634 uvc->control_ep = ep;
635 ep->driver_data = uvc;
636
637 if (gadget_is_superspeed(c->cdev->gadget))
638 ep = usb_ep_autoconfig_ss(cdev->gadget, &uvc_ss_streaming_ep,
639 &uvc_ss_streaming_comp);
640 else if (gadget_is_dualspeed(cdev->gadget))
641 ep = usb_ep_autoconfig(cdev->gadget, &uvc_hs_streaming_ep);
642 else
643 ep = usb_ep_autoconfig(cdev->gadget, &uvc_fs_streaming_ep);
644
645 if (!ep) {
646 INFO(cdev, "Unable to allocate streaming EP\n");
647 goto error;
648 }
649 uvc->video.ep = ep;
650 ep->driver_data = uvc;
651
652 uvc_fs_streaming_ep.bEndpointAddress = uvc->video.ep->address;
653 uvc_hs_streaming_ep.bEndpointAddress = uvc->video.ep->address;
654 uvc_ss_streaming_ep.bEndpointAddress = uvc->video.ep->address;
655
656 /* Allocate interface IDs. */
657 if ((ret = usb_interface_id(c, f)) < 0)
658 goto error;
659 uvc_iad.bFirstInterface = ret;
660 uvc_control_intf.bInterfaceNumber = ret;
661 uvc->control_intf = ret;
662
663 if ((ret = usb_interface_id(c, f)) < 0)
664 goto error;
665 uvc_streaming_intf_alt0.bInterfaceNumber = ret;
666 uvc_streaming_intf_alt1.bInterfaceNumber = ret;
667 uvc->streaming_intf = ret;
668
669 /* Copy descriptors */
670 f->fs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_FULL);
671 if (gadget_is_dualspeed(cdev->gadget))
672 f->hs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_HIGH);
673 if (gadget_is_superspeed(c->cdev->gadget))
674 f->ss_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_SUPER);
675
676 /* Preallocate control endpoint request. */
677 uvc->control_req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL);
678 uvc->control_buf = kmalloc(UVC_MAX_REQUEST_SIZE, GFP_KERNEL);
679 if (uvc->control_req == NULL || uvc->control_buf == NULL) {
680 ret = -ENOMEM;
681 goto error;
682 }
683
684 uvc->control_req->buf = uvc->control_buf;
685 uvc->control_req->complete = uvc_function_ep0_complete;
686 uvc->control_req->context = uvc;
687
688 /* Avoid letting this gadget enumerate until the userspace server is
689 * active.
690 */
691 if ((ret = usb_function_deactivate(f)) < 0)
692 goto error;
693
694 if (v4l2_device_register(&cdev->gadget->dev, &uvc->v4l2_dev)) {
695 printk(KERN_INFO "v4l2_device_register failed\n");
696 goto error;
697 }
698
699 /* Initialise video. */
700 ret = uvc_video_init(&uvc->video);
701 if (ret < 0)
702 goto error;
703
704 /* Register a V4L2 device. */
705 ret = uvc_register_video(uvc);
706 if (ret < 0) {
707 printk(KERN_INFO "Unable to register video device\n");
708 goto error;
709 }
710
711 return 0;
712
713error:
714 v4l2_device_unregister(&uvc->v4l2_dev);
715 if (uvc->vdev)
716 video_device_release(uvc->vdev);
717
718 if (uvc->control_ep)
719 uvc->control_ep->driver_data = NULL;
720 if (uvc->video.ep)
721 uvc->video.ep->driver_data = NULL;
722
723 if (uvc->control_req) {
724 usb_ep_free_request(cdev->gadget->ep0, uvc->control_req);
725 kfree(uvc->control_buf);
726 }
727
728 usb_free_all_descriptors(f);
729 return ret;
730}
731
732/* --------------------------------------------------------------------------
733 * USB gadget function
734 */
735
736/**
737 * uvc_bind_config - add a UVC function to a configuration
738 * @c: the configuration to support the UVC instance
739 * Context: single threaded during gadget setup
740 *
741 * Returns zero on success, else negative errno.
742 *
743 * Caller must have called @uvc_setup(). Caller is also responsible for
744 * calling @uvc_cleanup() before module unload.
745 */
746int __init
747uvc_bind_config(struct usb_configuration *c,
748 const struct uvc_descriptor_header * const *fs_control,
749 const struct uvc_descriptor_header * const *ss_control,
750 const struct uvc_descriptor_header * const *fs_streaming,
751 const struct uvc_descriptor_header * const *hs_streaming,
752 const struct uvc_descriptor_header * const *ss_streaming)
753{
754 struct uvc_device *uvc;
755 int ret = 0;
756
757 /* TODO Check if the USB device controller supports the required
758 * features.
759 */
760 if (!gadget_is_dualspeed(c->cdev->gadget))
761 return -EINVAL;
762
763 uvc = kzalloc(sizeof(*uvc), GFP_KERNEL);
764 if (uvc == NULL)
765 return -ENOMEM;
766
767 uvc->state = UVC_STATE_DISCONNECTED;
768
769 /* Validate the descriptors. */
770 if (fs_control == NULL || fs_control[0] == NULL ||
771 fs_control[0]->bDescriptorSubType != UVC_VC_HEADER)
772 goto error;
773
774 if (ss_control == NULL || ss_control[0] == NULL ||
775 ss_control[0]->bDescriptorSubType != UVC_VC_HEADER)
776 goto error;
777
778 if (fs_streaming == NULL || fs_streaming[0] == NULL ||
779 fs_streaming[0]->bDescriptorSubType != UVC_VS_INPUT_HEADER)
780 goto error;
781
782 if (hs_streaming == NULL || hs_streaming[0] == NULL ||
783 hs_streaming[0]->bDescriptorSubType != UVC_VS_INPUT_HEADER)
784 goto error;
785
786 if (ss_streaming == NULL || ss_streaming[0] == NULL ||
787 ss_streaming[0]->bDescriptorSubType != UVC_VS_INPUT_HEADER)
788 goto error;
789
790 uvc->desc.fs_control = fs_control;
791 uvc->desc.ss_control = ss_control;
792 uvc->desc.fs_streaming = fs_streaming;
793 uvc->desc.hs_streaming = hs_streaming;
794 uvc->desc.ss_streaming = ss_streaming;
795
796 /* String descriptors are global, we only need to allocate string IDs
797 * for the first UVC function. UVC functions beyond the first (if any)
798 * will reuse the same IDs.
799 */
800 if (uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id == 0) {
801 ret = usb_string_ids_tab(c->cdev, uvc_en_us_strings);
802 if (ret)
803 goto error;
804 uvc_iad.iFunction =
805 uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id;
806 uvc_control_intf.iInterface =
807 uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id;
808 ret = uvc_en_us_strings[UVC_STRING_STREAMING_IDX].id;
809 uvc_streaming_intf_alt0.iInterface = ret;
810 uvc_streaming_intf_alt1.iInterface = ret;
811 }
812
813 /* Register the function. */
814 uvc->func.name = "uvc";
815 uvc->func.strings = uvc_function_strings;
816 uvc->func.bind = uvc_function_bind;
817 uvc->func.unbind = uvc_function_unbind;
818 uvc->func.get_alt = uvc_function_get_alt;
819 uvc->func.set_alt = uvc_function_set_alt;
820 uvc->func.disable = uvc_function_disable;
821 uvc->func.setup = uvc_function_setup;
822
823 ret = usb_add_function(c, &uvc->func);
824 if (ret)
825 kfree(uvc);
826
827 return ret;
828
829error:
830 kfree(uvc);
831 return ret;
832}
833
834module_param_named(trace, uvc_gadget_trace_param, uint, S_IRUGO|S_IWUSR);
835MODULE_PARM_DESC(trace, "Trace level bitmask");
836
generated by cgit v1.2.2 (git 2.25.0) at 2026-05-29 15:19:59 -0400