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USB: dummy-hcd: Fix erroneous synchronization change
[linux/fpc-iii.git] / drivers / usb / gadget / function / f_uvc.c
blobc7689d05356c4f57f4c7f37559a0c5d1a7fc2ec6
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/module.h>
15 #include <linux/device.h>
16 #include <linux/errno.h>
17 #include <linux/fs.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>
26
27 #include <media/v4l2-dev.h>
28 #include <media/v4l2-event.h>
29
30 #include "u_uvc.h"
31 #include "uvc.h"
32 #include "uvc_configfs.h"
33 #include "uvc_v4l2.h"
34 #include "uvc_video.h"
35
36 unsigned int uvc_gadget_trace_param;
37
38 /* --------------------------------------------------------------------------
39 * Function descriptors
40 */
41
42 /* string IDs are assigned dynamically */
43
44 #define UVC_STRING_CONTROL_IDX 0
45 #define UVC_STRING_STREAMING_IDX 1
46
47 static struct usb_string uvc_en_us_strings[] = {
48 [UVC_STRING_CONTROL_IDX].s = "UVC Camera",
49 [UVC_STRING_STREAMING_IDX].s = "Video Streaming",
50 { }
51 };
52
53 static struct usb_gadget_strings uvc_stringtab = {
54 .language = 0x0409, /* en-us */
55 .strings = uvc_en_us_strings,
56 };
57
58 static struct usb_gadget_strings *uvc_function_strings[] = {
59 &uvc_stringtab,
60 NULL,
61 };
62
63 #define UVC_INTF_VIDEO_CONTROL 0
64 #define UVC_INTF_VIDEO_STREAMING 1
65
66 #define UVC_STATUS_MAX_PACKET_SIZE 16 /* 16 bytes status */
67
68 static struct usb_interface_assoc_descriptor uvc_iad = {
69 .bLength = sizeof(uvc_iad),
70 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
71 .bFirstInterface = 0,
72 .bInterfaceCount = 2,
73 .bFunctionClass = USB_CLASS_VIDEO,
74 .bFunctionSubClass = UVC_SC_VIDEO_INTERFACE_COLLECTION,
75 .bFunctionProtocol = 0x00,
76 .iFunction = 0,
77 };
78
79 static struct usb_interface_descriptor uvc_control_intf = {
80 .bLength = USB_DT_INTERFACE_SIZE,
81 .bDescriptorType = USB_DT_INTERFACE,
82 .bInterfaceNumber = UVC_INTF_VIDEO_CONTROL,
83 .bAlternateSetting = 0,
84 .bNumEndpoints = 1,
85 .bInterfaceClass = USB_CLASS_VIDEO,
86 .bInterfaceSubClass = UVC_SC_VIDEOCONTROL,
87 .bInterfaceProtocol = 0x00,
88 .iInterface = 0,
89 };
90
91 static struct usb_endpoint_descriptor uvc_control_ep = {
92 .bLength = USB_DT_ENDPOINT_SIZE,
93 .bDescriptorType = USB_DT_ENDPOINT,
94 .bEndpointAddress = USB_DIR_IN,
95 .bmAttributes = USB_ENDPOINT_XFER_INT,
96 .wMaxPacketSize = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE),
97 .bInterval = 8,
98 };
99
100 static struct usb_ss_ep_comp_descriptor uvc_ss_control_comp = {
101 .bLength = sizeof(uvc_ss_control_comp),
102 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
103 /* The following 3 values can be tweaked if necessary. */
104 .bMaxBurst = 0,
105 .bmAttributes = 0,
106 .wBytesPerInterval = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE),
107 };
108
109 static struct uvc_control_endpoint_descriptor uvc_control_cs_ep = {
110 .bLength = UVC_DT_CONTROL_ENDPOINT_SIZE,
111 .bDescriptorType = USB_DT_CS_ENDPOINT,
112 .bDescriptorSubType = UVC_EP_INTERRUPT,
113 .wMaxTransferSize = cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE),
114 };
115
116 static struct usb_interface_descriptor uvc_streaming_intf_alt0 = {
117 .bLength = USB_DT_INTERFACE_SIZE,
118 .bDescriptorType = USB_DT_INTERFACE,
119 .bInterfaceNumber = UVC_INTF_VIDEO_STREAMING,
120 .bAlternateSetting = 0,
121 .bNumEndpoints = 0,
122 .bInterfaceClass = USB_CLASS_VIDEO,
123 .bInterfaceSubClass = UVC_SC_VIDEOSTREAMING,
124 .bInterfaceProtocol = 0x00,
125 .iInterface = 0,
126 };
127
128 static struct usb_interface_descriptor uvc_streaming_intf_alt1 = {
129 .bLength = USB_DT_INTERFACE_SIZE,
130 .bDescriptorType = USB_DT_INTERFACE,
131 .bInterfaceNumber = UVC_INTF_VIDEO_STREAMING,
132 .bAlternateSetting = 1,
133 .bNumEndpoints = 1,
134 .bInterfaceClass = USB_CLASS_VIDEO,
135 .bInterfaceSubClass = UVC_SC_VIDEOSTREAMING,
136 .bInterfaceProtocol = 0x00,
137 .iInterface = 0,
138 };
139
140 static struct usb_endpoint_descriptor uvc_fs_streaming_ep = {
141 .bLength = USB_DT_ENDPOINT_SIZE,
142 .bDescriptorType = USB_DT_ENDPOINT,
143 .bEndpointAddress = USB_DIR_IN,
144 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC
145 | USB_ENDPOINT_XFER_ISOC,
146 /* The wMaxPacketSize and bInterval values will be initialized from
147 * module parameters.
148 */
149 };
150
151 static struct usb_endpoint_descriptor uvc_hs_streaming_ep = {
152 .bLength = USB_DT_ENDPOINT_SIZE,
153 .bDescriptorType = USB_DT_ENDPOINT,
154 .bEndpointAddress = USB_DIR_IN,
155 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC
156 | USB_ENDPOINT_XFER_ISOC,
157 /* The wMaxPacketSize and bInterval values will be initialized from
158 * module parameters.
159 */
160 };
161
162 static struct usb_endpoint_descriptor uvc_ss_streaming_ep = {
163 .bLength = USB_DT_ENDPOINT_SIZE,
164 .bDescriptorType = USB_DT_ENDPOINT,
165
166 .bEndpointAddress = USB_DIR_IN,
167 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC
168 | USB_ENDPOINT_XFER_ISOC,
169 /* The wMaxPacketSize and bInterval values will be initialized from
170 * module parameters.
171 */
172 };
173
174 static struct usb_ss_ep_comp_descriptor uvc_ss_streaming_comp = {
175 .bLength = sizeof(uvc_ss_streaming_comp),
176 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
177 /* The bMaxBurst, bmAttributes and wBytesPerInterval values will be
178 * initialized from module parameters.
179 */
180 };
181
182 static const struct usb_descriptor_header * const uvc_fs_streaming[] = {
183 (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
184 (struct usb_descriptor_header *) &uvc_fs_streaming_ep,
185 NULL,
186 };
187
188 static const struct usb_descriptor_header * const uvc_hs_streaming[] = {
189 (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
190 (struct usb_descriptor_header *) &uvc_hs_streaming_ep,
191 NULL,
192 };
193
194 static const struct usb_descriptor_header * const uvc_ss_streaming[] = {
195 (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
196 (struct usb_descriptor_header *) &uvc_ss_streaming_ep,
197 (struct usb_descriptor_header *) &uvc_ss_streaming_comp,
198 NULL,
199 };
200
201 void uvc_set_trace_param(unsigned int trace)
202 {
203 uvc_gadget_trace_param = trace;
204 }
205 EXPORT_SYMBOL(uvc_set_trace_param);
206
207 /* --------------------------------------------------------------------------
208 * Control requests
209 */
210
211 static void
212 uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req)
213 {
214 struct uvc_device *uvc = req->context;
215 struct v4l2_event v4l2_event;
216 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
217
218 if (uvc->event_setup_out) {
219 uvc->event_setup_out = 0;
220
221 memset(&v4l2_event, 0, sizeof(v4l2_event));
222 v4l2_event.type = UVC_EVENT_DATA;
223 uvc_event->data.length = req->actual;
224 memcpy(&uvc_event->data.data, req->buf, req->actual);
225 v4l2_event_queue(&uvc->vdev, &v4l2_event);
226 }
227 }
228
229 static int
230 uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
231 {
232 struct uvc_device *uvc = to_uvc(f);
233 struct v4l2_event v4l2_event;
234 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
235
236 /* printk(KERN_INFO "setup request %02x %02x value %04x index %04x %04x\n",
237 * ctrl->bRequestType, ctrl->bRequest, le16_to_cpu(ctrl->wValue),
238 * le16_to_cpu(ctrl->wIndex), le16_to_cpu(ctrl->wLength));
239 */
240
241 if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) {
242 INFO(f->config->cdev, "invalid request type\n");
243 return -EINVAL;
244 }
245
246 /* Stall too big requests. */
247 if (le16_to_cpu(ctrl->wLength) > UVC_MAX_REQUEST_SIZE)
248 return -EINVAL;
249
250 /* Tell the complete callback to generate an event for the next request
251 * that will be enqueued by UVCIOC_SEND_RESPONSE.
252 */
253 uvc->event_setup_out = !(ctrl->bRequestType & USB_DIR_IN);
254 uvc->event_length = le16_to_cpu(ctrl->wLength);
255
256 memset(&v4l2_event, 0, sizeof(v4l2_event));
257 v4l2_event.type = UVC_EVENT_SETUP;
258 memcpy(&uvc_event->req, ctrl, sizeof(uvc_event->req));
259 v4l2_event_queue(&uvc->vdev, &v4l2_event);
260
261 return 0;
262 }
263
264 void uvc_function_setup_continue(struct uvc_device *uvc)
265 {
266 struct usb_composite_dev *cdev = uvc->func.config->cdev;
267
268 usb_composite_setup_continue(cdev);
269 }
270
271 static int
272 uvc_function_get_alt(struct usb_function *f, unsigned interface)
273 {
274 struct uvc_device *uvc = to_uvc(f);
275
276 INFO(f->config->cdev, "uvc_function_get_alt(%u)\n", interface);
277
278 if (interface == uvc->control_intf)
279 return 0;
280 else if (interface != uvc->streaming_intf)
281 return -EINVAL;
282 else
283 return uvc->video.ep->enabled ? 1 : 0;
284 }
285
286 static int
287 uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
288 {
289 struct uvc_device *uvc = to_uvc(f);
290 struct usb_composite_dev *cdev = f->config->cdev;
291 struct v4l2_event v4l2_event;
292 struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
293 int ret;
294
295 INFO(cdev, "uvc_function_set_alt(%u, %u)\n", interface, alt);
296
297 if (interface == uvc->control_intf) {
298 if (alt)
299 return -EINVAL;
300
301 INFO(cdev, "reset UVC Control\n");
302 usb_ep_disable(uvc->control_ep);
303
304 if (!uvc->control_ep->desc)
305 if (config_ep_by_speed(cdev->gadget, f, uvc->control_ep))
306 return -EINVAL;
307
308 usb_ep_enable(uvc->control_ep);
309
310 if (uvc->state == UVC_STATE_DISCONNECTED) {
311 memset(&v4l2_event, 0, sizeof(v4l2_event));
312 v4l2_event.type = UVC_EVENT_CONNECT;
313 uvc_event->speed = cdev->gadget->speed;
314 v4l2_event_queue(&uvc->vdev, &v4l2_event);
315
316 uvc->state = UVC_STATE_CONNECTED;
317 }
318
319 return 0;
320 }
321
322 if (interface != uvc->streaming_intf)
323 return -EINVAL;
324
325 /* TODO
326 if (usb_endpoint_xfer_bulk(&uvc->desc.vs_ep))
327 return alt ? -EINVAL : 0;
328 */
329
330 switch (alt) {
331 case 0:
332 if (uvc->state != UVC_STATE_STREAMING)
333 return 0;
334
335 if (uvc->video.ep)
336 usb_ep_disable(uvc->video.ep);
337
338 memset(&v4l2_event, 0, sizeof(v4l2_event));
339 v4l2_event.type = UVC_EVENT_STREAMOFF;
340 v4l2_event_queue(&uvc->vdev, &v4l2_event);
341
342 uvc->state = UVC_STATE_CONNECTED;
343 return 0;
344
345 case 1:
346 if (uvc->state != UVC_STATE_CONNECTED)
347 return 0;
348
349 if (!uvc->video.ep)
350 return -EINVAL;
351
352 INFO(cdev, "reset UVC\n");
353 usb_ep_disable(uvc->video.ep);
354
355 ret = config_ep_by_speed(f->config->cdev->gadget,
356 &(uvc->func), uvc->video.ep);
357 if (ret)
358 return ret;
359 usb_ep_enable(uvc->video.ep);
360
361 memset(&v4l2_event, 0, sizeof(v4l2_event));
362 v4l2_event.type = UVC_EVENT_STREAMON;
363 v4l2_event_queue(&uvc->vdev, &v4l2_event);
364 return USB_GADGET_DELAYED_STATUS;
365
366 default:
367 return -EINVAL;
368 }
369 }
370
371 static void
372 uvc_function_disable(struct usb_function *f)
373 {
374 struct uvc_device *uvc = to_uvc(f);
375 struct v4l2_event v4l2_event;
376
377 INFO(f->config->cdev, "uvc_function_disable\n");
378
379 memset(&v4l2_event, 0, sizeof(v4l2_event));
380 v4l2_event.type = UVC_EVENT_DISCONNECT;
381 v4l2_event_queue(&uvc->vdev, &v4l2_event);
382
383 uvc->state = UVC_STATE_DISCONNECTED;
384
385 usb_ep_disable(uvc->video.ep);
386 usb_ep_disable(uvc->control_ep);
387 }
388
389 /* --------------------------------------------------------------------------
390 * Connection / disconnection
391 */
392
393 void
394 uvc_function_connect(struct uvc_device *uvc)
395 {
396 struct usb_composite_dev *cdev = uvc->func.config->cdev;
397 int ret;
398
399 if ((ret = usb_function_activate(&uvc->func)) < 0)
400 INFO(cdev, "UVC connect failed with %d\n", ret);
401 }
402
403 void
404 uvc_function_disconnect(struct uvc_device *uvc)
405 {
406 struct usb_composite_dev *cdev = uvc->func.config->cdev;
407 int ret;
408
409 if ((ret = usb_function_deactivate(&uvc->func)) < 0)
410 INFO(cdev, "UVC disconnect failed with %d\n", ret);
411 }
412
413 /* --------------------------------------------------------------------------
414 * USB probe and disconnect
415 */
416
417 static int
418 uvc_register_video(struct uvc_device *uvc)
419 {
420 struct usb_composite_dev *cdev = uvc->func.config->cdev;
421
422 /* TODO reference counting. */
423 uvc->vdev.v4l2_dev = &uvc->v4l2_dev;
424 uvc->vdev.fops = &uvc_v4l2_fops;
425 uvc->vdev.ioctl_ops = &uvc_v4l2_ioctl_ops;
426 uvc->vdev.release = video_device_release_empty;
427 uvc->vdev.vfl_dir = VFL_DIR_TX;
428 uvc->vdev.lock = &uvc->video.mutex;
429 strlcpy(uvc->vdev.name, cdev->gadget->name, sizeof(uvc->vdev.name));
430
431 video_set_drvdata(&uvc->vdev, uvc);
432
433 return video_register_device(&uvc->vdev, VFL_TYPE_GRABBER, -1);
434 }
435
436 #define UVC_COPY_DESCRIPTOR(mem, dst, desc) \
437 do { \
438 memcpy(mem, desc, (desc)->bLength); \
439 *(dst)++ = mem; \
440 mem += (desc)->bLength; \
441 } while (0);
442
443 #define UVC_COPY_DESCRIPTORS(mem, dst, src) \
444 do { \
445 const struct usb_descriptor_header * const *__src; \
446 for (__src = src; *__src; ++__src) { \
447 memcpy(mem, *__src, (*__src)->bLength); \
448 *dst++ = mem; \
449 mem += (*__src)->bLength; \
450 } \
451 } while (0)
452
453 static struct usb_descriptor_header **
454 uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
455 {
456 struct uvc_input_header_descriptor *uvc_streaming_header;
457 struct uvc_header_descriptor *uvc_control_header;
458 const struct uvc_descriptor_header * const *uvc_control_desc;
459 const struct uvc_descriptor_header * const *uvc_streaming_cls;
460 const struct usb_descriptor_header * const *uvc_streaming_std;
461 const struct usb_descriptor_header * const *src;
462 struct usb_descriptor_header **dst;
463 struct usb_descriptor_header **hdr;
464 unsigned int control_size;
465 unsigned int streaming_size;
466 unsigned int n_desc;
467 unsigned int bytes;
468 void *mem;
469
470 switch (speed) {
471 case USB_SPEED_SUPER:
472 uvc_control_desc = uvc->desc.ss_control;
473 uvc_streaming_cls = uvc->desc.ss_streaming;
474 uvc_streaming_std = uvc_ss_streaming;
475 break;
476
477 case USB_SPEED_HIGH:
478 uvc_control_desc = uvc->desc.fs_control;
479 uvc_streaming_cls = uvc->desc.hs_streaming;
480 uvc_streaming_std = uvc_hs_streaming;
481 break;
482
483 case USB_SPEED_FULL:
484 default:
485 uvc_control_desc = uvc->desc.fs_control;
486 uvc_streaming_cls = uvc->desc.fs_streaming;
487 uvc_streaming_std = uvc_fs_streaming;
488 break;
489 }
490
491 if (!uvc_control_desc || !uvc_streaming_cls)
492 return ERR_PTR(-ENODEV);
493
494 /* Descriptors layout
495 *
496 * uvc_iad
497 * uvc_control_intf
498 * Class-specific UVC control descriptors
499 * uvc_control_ep
500 * uvc_control_cs_ep
501 * uvc_ss_control_comp (for SS only)
502 * uvc_streaming_intf_alt0
503 * Class-specific UVC streaming descriptors
504 * uvc_{fs|hs}_streaming
505 */
506
507 /* Count descriptors and compute their size. */
508 control_size = 0;
509 streaming_size = 0;
510 bytes = uvc_iad.bLength + uvc_control_intf.bLength
511 + uvc_control_ep.bLength + uvc_control_cs_ep.bLength
512 + uvc_streaming_intf_alt0.bLength;
513
514 if (speed == USB_SPEED_SUPER) {
515 bytes += uvc_ss_control_comp.bLength;
516 n_desc = 6;
517 } else {
518 n_desc = 5;
519 }
520
521 for (src = (const struct usb_descriptor_header **)uvc_control_desc;
522 *src; ++src) {
523 control_size += (*src)->bLength;
524 bytes += (*src)->bLength;
525 n_desc++;
526 }
527 for (src = (const struct usb_descriptor_header **)uvc_streaming_cls;
528 *src; ++src) {
529 streaming_size += (*src)->bLength;
530 bytes += (*src)->bLength;
531 n_desc++;
532 }
533 for (src = uvc_streaming_std; *src; ++src) {
534 bytes += (*src)->bLength;
535 n_desc++;
536 }
537
538 mem = kmalloc((n_desc + 1) * sizeof(*src) + bytes, GFP_KERNEL);
539 if (mem == NULL)
540 return NULL;
541
542 hdr = mem;
543 dst = mem;
544 mem += (n_desc + 1) * sizeof(*src);
545
546 /* Copy the descriptors. */
547 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_iad);
548 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_intf);
549
550 uvc_control_header = mem;
551 UVC_COPY_DESCRIPTORS(mem, dst,
552 (const struct usb_descriptor_header **)uvc_control_desc);
553 uvc_control_header->wTotalLength = cpu_to_le16(control_size);
554 uvc_control_header->bInCollection = 1;
555 uvc_control_header->baInterfaceNr[0] = uvc->streaming_intf;
556
557 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_ep);
558 if (speed == USB_SPEED_SUPER)
559 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_ss_control_comp);
560
561 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_control_cs_ep);
562 UVC_COPY_DESCRIPTOR(mem, dst, &uvc_streaming_intf_alt0);
563
564 uvc_streaming_header = mem;
565 UVC_COPY_DESCRIPTORS(mem, dst,
566 (const struct usb_descriptor_header**)uvc_streaming_cls);
567 uvc_streaming_header->wTotalLength = cpu_to_le16(streaming_size);
568 uvc_streaming_header->bEndpointAddress = uvc->video.ep->address;
569
570 UVC_COPY_DESCRIPTORS(mem, dst, uvc_streaming_std);
571
572 *dst = NULL;
573 return hdr;
574 }
575
576 static int
577 uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
578 {
579 struct usb_composite_dev *cdev = c->cdev;
580 struct uvc_device *uvc = to_uvc(f);
581 struct usb_string *us;
582 unsigned int max_packet_mult;
583 unsigned int max_packet_size;
584 struct usb_ep *ep;
585 struct f_uvc_opts *opts;
586 int ret = -EINVAL;
587
588 INFO(cdev, "uvc_function_bind\n");
589
590 opts = fi_to_f_uvc_opts(f->fi);
591 /* Sanity check the streaming endpoint module parameters.
592 */
593 opts->streaming_interval = clamp(opts->streaming_interval, 1U, 16U);
594 opts->streaming_maxpacket = clamp(opts->streaming_maxpacket, 1U, 3072U);
595 opts->streaming_maxburst = min(opts->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 (opts->streaming_maxpacket <= 1024) {
604 max_packet_mult = 1;
605 max_packet_size = opts->streaming_maxpacket;
606 } else if (opts->streaming_maxpacket <= 2048) {
607 max_packet_mult = 2;
608 max_packet_size = opts->streaming_maxpacket / 2;
609 } else {
610 max_packet_mult = 3;
611 max_packet_size = opts->streaming_maxpacket / 3;
612 }
613
614 uvc_fs_streaming_ep.wMaxPacketSize =
615 cpu_to_le16(min(opts->streaming_maxpacket, 1023U));
616 uvc_fs_streaming_ep.bInterval = opts->streaming_interval;
617
618 uvc_hs_streaming_ep.wMaxPacketSize =
619 cpu_to_le16(max_packet_size | ((max_packet_mult - 1) << 11));
620 uvc_hs_streaming_ep.bInterval = opts->streaming_interval;
621
622 uvc_ss_streaming_ep.wMaxPacketSize = cpu_to_le16(max_packet_size);
623 uvc_ss_streaming_ep.bInterval = opts->streaming_interval;
624 uvc_ss_streaming_comp.bmAttributes = max_packet_mult - 1;
625 uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst;
626 uvc_ss_streaming_comp.wBytesPerInterval =
627 cpu_to_le16(max_packet_size * max_packet_mult *
628 (opts->streaming_maxburst + 1));
629
630 /* Allocate endpoints. */
631 ep = usb_ep_autoconfig(cdev->gadget, &uvc_control_ep);
632 if (!ep) {
633 INFO(cdev, "Unable to allocate control EP\n");
634 goto error;
635 }
636 uvc->control_ep = ep;
637
638 if (gadget_is_superspeed(c->cdev->gadget))
639 ep = usb_ep_autoconfig_ss(cdev->gadget, &uvc_ss_streaming_ep,
640 &uvc_ss_streaming_comp);
641 else if (gadget_is_dualspeed(cdev->gadget))
642 ep = usb_ep_autoconfig(cdev->gadget, &uvc_hs_streaming_ep);
643 else
644 ep = usb_ep_autoconfig(cdev->gadget, &uvc_fs_streaming_ep);
645
646 if (!ep) {
647 INFO(cdev, "Unable to allocate streaming EP\n");
648 goto error;
649 }
650 uvc->video.ep = ep;
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 us = usb_gstrings_attach(cdev, uvc_function_strings,
657 ARRAY_SIZE(uvc_en_us_strings));
658 if (IS_ERR(us)) {
659 ret = PTR_ERR(us);
660 goto error;
661 }
662 uvc_iad.iFunction = us[UVC_STRING_CONTROL_IDX].id;
663 uvc_control_intf.iInterface = us[UVC_STRING_CONTROL_IDX].id;
664 ret = us[UVC_STRING_STREAMING_IDX].id;
665 uvc_streaming_intf_alt0.iInterface = ret;
666 uvc_streaming_intf_alt1.iInterface = ret;
667
668 /* Allocate interface IDs. */
669 if ((ret = usb_interface_id(c, f)) < 0)
670 goto error;
671 uvc_iad.bFirstInterface = ret;
672 uvc_control_intf.bInterfaceNumber = ret;
673 uvc->control_intf = ret;
674
675 if ((ret = usb_interface_id(c, f)) < 0)
676 goto error;
677 uvc_streaming_intf_alt0.bInterfaceNumber = ret;
678 uvc_streaming_intf_alt1.bInterfaceNumber = ret;
679 uvc->streaming_intf = ret;
680
681 /* Copy descriptors */
682 f->fs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_FULL);
683 if (IS_ERR(f->fs_descriptors)) {
684 ret = PTR_ERR(f->fs_descriptors);
685 f->fs_descriptors = NULL;
686 goto error;
687 }
688 if (gadget_is_dualspeed(cdev->gadget)) {
689 f->hs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_HIGH);
690 if (IS_ERR(f->hs_descriptors)) {
691 ret = PTR_ERR(f->hs_descriptors);
692 f->hs_descriptors = NULL;
693 goto error;
694 }
695 }
696 if (gadget_is_superspeed(c->cdev->gadget)) {
697 f->ss_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_SUPER);
698 if (IS_ERR(f->ss_descriptors)) {
699 ret = PTR_ERR(f->ss_descriptors);
700 f->ss_descriptors = NULL;
701 goto error;
702 }
703 }
704
705 /* Preallocate control endpoint request. */
706 uvc->control_req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL);
707 uvc->control_buf = kmalloc(UVC_MAX_REQUEST_SIZE, GFP_KERNEL);
708 if (uvc->control_req == NULL || uvc->control_buf == NULL) {
709 ret = -ENOMEM;
710 goto error;
711 }
712
713 uvc->control_req->buf = uvc->control_buf;
714 uvc->control_req->complete = uvc_function_ep0_complete;
715 uvc->control_req->context = uvc;
716
717 if (v4l2_device_register(&cdev->gadget->dev, &uvc->v4l2_dev)) {
718 printk(KERN_INFO "v4l2_device_register failed\n");
719 goto error;
720 }
721
722 /* Initialise video. */
723 ret = uvcg_video_init(&uvc->video);
724 if (ret < 0)
725 goto error;
726
727 /* Register a V4L2 device. */
728 ret = uvc_register_video(uvc);
729 if (ret < 0) {
730 printk(KERN_INFO "Unable to register video device\n");
731 goto error;
732 }
733
734 return 0;
735
736 error:
737 v4l2_device_unregister(&uvc->v4l2_dev);
738
739 if (uvc->control_req)
740 usb_ep_free_request(cdev->gadget->ep0, uvc->control_req);
741 kfree(uvc->control_buf);
742
743 usb_free_all_descriptors(f);
744 return ret;
745 }
746
747 /* --------------------------------------------------------------------------
748 * USB gadget function
749 */
750
751 static void uvc_free_inst(struct usb_function_instance *f)
752 {
753 struct f_uvc_opts *opts = fi_to_f_uvc_opts(f);
754
755 mutex_destroy(&opts->lock);
756 kfree(opts);
757 }
758
759 static struct usb_function_instance *uvc_alloc_inst(void)
760 {
761 struct f_uvc_opts *opts;
762 struct uvc_camera_terminal_descriptor *cd;
763 struct uvc_processing_unit_descriptor *pd;
764 struct uvc_output_terminal_descriptor *od;
765 struct uvc_color_matching_descriptor *md;
766 struct uvc_descriptor_header **ctl_cls;
767
768 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
769 if (!opts)
770 return ERR_PTR(-ENOMEM);
771 opts->func_inst.free_func_inst = uvc_free_inst;
772 mutex_init(&opts->lock);
773
774 cd = &opts->uvc_camera_terminal;
775 cd->bLength = UVC_DT_CAMERA_TERMINAL_SIZE(3);
776 cd->bDescriptorType = USB_DT_CS_INTERFACE;
777 cd->bDescriptorSubType = UVC_VC_INPUT_TERMINAL;
778 cd->bTerminalID = 1;
779 cd->wTerminalType = cpu_to_le16(0x0201);
780 cd->bAssocTerminal = 0;
781 cd->iTerminal = 0;
782 cd->wObjectiveFocalLengthMin = cpu_to_le16(0);
783 cd->wObjectiveFocalLengthMax = cpu_to_le16(0);
784 cd->wOcularFocalLength = cpu_to_le16(0);
785 cd->bControlSize = 3;
786 cd->bmControls[0] = 2;
787 cd->bmControls[1] = 0;
788 cd->bmControls[2] = 0;
789
790 pd = &opts->uvc_processing;
791 pd->bLength = UVC_DT_PROCESSING_UNIT_SIZE(2);
792 pd->bDescriptorType = USB_DT_CS_INTERFACE;
793 pd->bDescriptorSubType = UVC_VC_PROCESSING_UNIT;
794 pd->bUnitID = 2;
795 pd->bSourceID = 1;
796 pd->wMaxMultiplier = cpu_to_le16(16*1024);
797 pd->bControlSize = 2;
798 pd->bmControls[0] = 1;
799 pd->bmControls[1] = 0;
800 pd->iProcessing = 0;
801
802 od = &opts->uvc_output_terminal;
803 od->bLength = UVC_DT_OUTPUT_TERMINAL_SIZE;
804 od->bDescriptorType = USB_DT_CS_INTERFACE;
805 od->bDescriptorSubType = UVC_VC_OUTPUT_TERMINAL;
806 od->bTerminalID = 3;
807 od->wTerminalType = cpu_to_le16(0x0101);
808 od->bAssocTerminal = 0;
809 od->bSourceID = 2;
810 od->iTerminal = 0;
811
812 md = &opts->uvc_color_matching;
813 md->bLength = UVC_DT_COLOR_MATCHING_SIZE;
814 md->bDescriptorType = USB_DT_CS_INTERFACE;
815 md->bDescriptorSubType = UVC_VS_COLORFORMAT;
816 md->bColorPrimaries = 1;
817 md->bTransferCharacteristics = 1;
818 md->bMatrixCoefficients = 4;
819
820 /* Prepare fs control class descriptors for configfs-based gadgets */
821 ctl_cls = opts->uvc_fs_control_cls;
822 ctl_cls[0] = NULL; /* assigned elsewhere by configfs */
823 ctl_cls[1] = (struct uvc_descriptor_header *)cd;
824 ctl_cls[2] = (struct uvc_descriptor_header *)pd;
825 ctl_cls[3] = (struct uvc_descriptor_header *)od;
826 ctl_cls[4] = NULL; /* NULL-terminate */
827 opts->fs_control =
828 (const struct uvc_descriptor_header * const *)ctl_cls;
829
830 /* Prepare hs control class descriptors for configfs-based gadgets */
831 ctl_cls = opts->uvc_ss_control_cls;
832 ctl_cls[0] = NULL; /* assigned elsewhere by configfs */
833 ctl_cls[1] = (struct uvc_descriptor_header *)cd;
834 ctl_cls[2] = (struct uvc_descriptor_header *)pd;
835 ctl_cls[3] = (struct uvc_descriptor_header *)od;
836 ctl_cls[4] = NULL; /* NULL-terminate */
837 opts->ss_control =
838 (const struct uvc_descriptor_header * const *)ctl_cls;
839
840 opts->streaming_interval = 1;
841 opts->streaming_maxpacket = 1024;
842
843 uvcg_attach_configfs(opts);
844 return &opts->func_inst;
845 }
846
847 static void uvc_free(struct usb_function *f)
848 {
849 struct uvc_device *uvc = to_uvc(f);
850 struct f_uvc_opts *opts = container_of(f->fi, struct f_uvc_opts,
851 func_inst);
852 --opts->refcnt;
853 kfree(uvc);
854 }
855
856 static void uvc_unbind(struct usb_configuration *c, struct usb_function *f)
857 {
858 struct usb_composite_dev *cdev = c->cdev;
859 struct uvc_device *uvc = to_uvc(f);
860
861 INFO(cdev, "%s\n", __func__);
862
863 video_unregister_device(&uvc->vdev);
864 v4l2_device_unregister(&uvc->v4l2_dev);
865
866 usb_ep_free_request(cdev->gadget->ep0, uvc->control_req);
867 kfree(uvc->control_buf);
868
869 usb_free_all_descriptors(f);
870 }
871
872 static struct usb_function *uvc_alloc(struct usb_function_instance *fi)
873 {
874 struct uvc_device *uvc;
875 struct f_uvc_opts *opts;
876 struct uvc_descriptor_header **strm_cls;
877
878 uvc = kzalloc(sizeof(*uvc), GFP_KERNEL);
879 if (uvc == NULL)
880 return ERR_PTR(-ENOMEM);
881
882 mutex_init(&uvc->video.mutex);
883 uvc->state = UVC_STATE_DISCONNECTED;
884 opts = fi_to_f_uvc_opts(fi);
885
886 mutex_lock(&opts->lock);
887 if (opts->uvc_fs_streaming_cls) {
888 strm_cls = opts->uvc_fs_streaming_cls;
889 opts->fs_streaming =
890 (const struct uvc_descriptor_header * const *)strm_cls;
891 }
892 if (opts->uvc_hs_streaming_cls) {
893 strm_cls = opts->uvc_hs_streaming_cls;
894 opts->hs_streaming =
895 (const struct uvc_descriptor_header * const *)strm_cls;
896 }
897 if (opts->uvc_ss_streaming_cls) {
898 strm_cls = opts->uvc_ss_streaming_cls;
899 opts->ss_streaming =
900 (const struct uvc_descriptor_header * const *)strm_cls;
901 }
902
903 uvc->desc.fs_control = opts->fs_control;
904 uvc->desc.ss_control = opts->ss_control;
905 uvc->desc.fs_streaming = opts->fs_streaming;
906 uvc->desc.hs_streaming = opts->hs_streaming;
907 uvc->desc.ss_streaming = opts->ss_streaming;
908 ++opts->refcnt;
909 mutex_unlock(&opts->lock);
910
911 /* Register the function. */
912 uvc->func.name = "uvc";
913 uvc->func.bind = uvc_function_bind;
914 uvc->func.unbind = uvc_unbind;
915 uvc->func.get_alt = uvc_function_get_alt;
916 uvc->func.set_alt = uvc_function_set_alt;
917 uvc->func.disable = uvc_function_disable;
918 uvc->func.setup = uvc_function_setup;
919 uvc->func.free_func = uvc_free;
920 uvc->func.bind_deactivated = true;
921
922 return &uvc->func;
923 }
924
925 DECLARE_USB_FUNCTION_INIT(uvc, uvc_alloc_inst, uvc_alloc);
926 MODULE_LICENSE("GPL");
927 MODULE_AUTHOR("Laurent Pinchart");
Linux with added FPC-III support