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1/*
2 * uvc_v4l2.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
14#include <linux/kernel.h>
15#include <linux/device.h>
16#include <linux/errno.h>
17#include <linux/list.h>
18#include <linux/mutex.h>
19#include <linux/version.h>
20#include <linux/videodev2.h>
21#include <linux/vmalloc.h>
22#include <linux/wait.h>
23
24#include <media/v4l2-dev.h>
25#include <media/v4l2-event.h>
26#include <media/v4l2-ioctl.h>
27
28#include "uvc.h"
29#include "uvc_queue.h"
30
31/* --------------------------------------------------------------------------
32 * Requests handling
33 */
34
35static int
36uvc_send_response(struct uvc_device *uvc, struct uvc_request_data *data)
37{
38 struct usb_composite_dev *cdev = uvc->func.config->cdev;
39 struct usb_request *req = uvc->control_req;
40
41 if (data->length < 0)
42 return usb_ep_set_halt(cdev->gadget->ep0);
43
44 req->length = min(uvc->event_length, data->length);
45 req->zero = data->length < uvc->event_length;
46 req->dma = DMA_ADDR_INVALID;
47
48 memcpy(req->buf, data->data, data->length);
49
50 return usb_ep_queue(cdev->gadget->ep0, req, GFP_KERNEL);
51}
52
53/* --------------------------------------------------------------------------
54 * V4L2
55 */
56
57struct uvc_format
58{
59 u8 bpp;
60 u32 fcc;
61};
62
63static struct uvc_format uvc_formats[] = {
64 { 16, V4L2_PIX_FMT_YUYV },
65 { 0, V4L2_PIX_FMT_MJPEG },
66};
67
68static int
69uvc_v4l2_get_format(struct uvc_video *video, struct v4l2_format *fmt)
70{
71 fmt->fmt.pix.pixelformat = video->fcc;
72 fmt->fmt.pix.width = video->width;
73 fmt->fmt.pix.height = video->height;
74 fmt->fmt.pix.field = V4L2_FIELD_NONE;
75 fmt->fmt.pix.bytesperline = video->bpp * video->width / 8;
76 fmt->fmt.pix.sizeimage = video->imagesize;
77 fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
78 fmt->fmt.pix.priv = 0;
79
80 return 0;
81}
82
83static int
84uvc_v4l2_set_format(struct uvc_video *video, struct v4l2_format *fmt)
85{
86 struct uvc_format *format;
87 unsigned int imagesize;
88 unsigned int bpl;
89 unsigned int i;
90
91 for (i = 0; i < ARRAY_SIZE(uvc_formats); ++i) {
92 format = &uvc_formats[i];
93 if (format->fcc == fmt->fmt.pix.pixelformat)
94 break;
95 }
96
97 if (i == ARRAY_SIZE(uvc_formats)) {
98 printk(KERN_INFO "Unsupported format 0x%08x.\n",
99 fmt->fmt.pix.pixelformat);
100 return -EINVAL;
101 }
102
103 bpl = format->bpp * fmt->fmt.pix.width / 8;
104 imagesize = bpl ? bpl * fmt->fmt.pix.height : fmt->fmt.pix.sizeimage;
105
106 video->fcc = format->fcc;
107 video->bpp = format->bpp;
108 video->width = fmt->fmt.pix.width;
109 video->height = fmt->fmt.pix.height;
110 video->imagesize = imagesize;
111
112 fmt->fmt.pix.field = V4L2_FIELD_NONE;
113 fmt->fmt.pix.bytesperline = bpl;
114 fmt->fmt.pix.sizeimage = imagesize;
115 fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
116 fmt->fmt.pix.priv = 0;
117
118 return 0;
119}
120
121static int
122uvc_v4l2_open(struct file *file)
123{
124 struct video_device *vdev = video_devdata(file);
125 struct uvc_device *uvc = video_get_drvdata(vdev);
126 struct uvc_file_handle *handle;
127
128 handle = kzalloc(sizeof(*handle), GFP_KERNEL);
129 if (handle == NULL)
130 return -ENOMEM;
131
132 v4l2_fh_init(&handle->vfh, vdev);
133 v4l2_fh_add(&handle->vfh);
134
135 handle->device = &uvc->video;
136 file->private_data = &handle->vfh;
137
138 uvc_function_connect(uvc);
139 return 0;
140}
141
142static int
143uvc_v4l2_release(struct file *file)
144{
145 struct video_device *vdev = video_devdata(file);
146 struct uvc_device *uvc = video_get_drvdata(vdev);
147 struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data);
148 struct uvc_video *video = handle->device;
149
150 uvc_function_disconnect(uvc);
151
152 uvc_video_enable(video, 0);
153 mutex_lock(&video->queue.mutex);
154 if (uvc_free_buffers(&video->queue) < 0)
155 printk(KERN_ERR "uvc_v4l2_release: Unable to free "
156 "buffers.\n");
157 mutex_unlock(&video->queue.mutex);
158
159 file->private_data = NULL;
160 v4l2_fh_del(&handle->vfh);
161 v4l2_fh_exit(&handle->vfh);
162 kfree(handle);
163 return 0;
164}
165
166static long
167uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
168{
169 struct video_device *vdev = video_devdata(file);
170 struct uvc_device *uvc = video_get_drvdata(vdev);
171 struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data);
172 struct usb_composite_dev *cdev = uvc->func.config->cdev;
173 struct uvc_video *video = &uvc->video;
174 int ret = 0;
175
176 switch (cmd) {
177 /* Query capabilities */
178 case VIDIOC_QUERYCAP:
179 {
180 struct v4l2_capability *cap = arg;
181
182 memset(cap, 0, sizeof *cap);
183 strncpy(cap->driver, "g_uvc", sizeof(cap->driver));
184 strncpy(cap->card, cdev->gadget->name, sizeof(cap->card));
185 strncpy(cap->bus_info, dev_name(&cdev->gadget->dev),
186 sizeof cap->bus_info);
187 cap->version = DRIVER_VERSION_NUMBER;
188 cap->capabilities = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
189 break;
190 }
191
192 /* Get & Set format */
193 case VIDIOC_G_FMT:
194 {
195 struct v4l2_format *fmt = arg;
196
197 if (fmt->type != video->queue.type)
198 return -EINVAL;
199
200 return uvc_v4l2_get_format(video, fmt);
201 }
202
203 case VIDIOC_S_FMT:
204 {
205 struct v4l2_format *fmt = arg;
206
207 if (fmt->type != video->queue.type)
208 return -EINVAL;
209
210 return uvc_v4l2_set_format(video, fmt);
211 }
212
213 /* Buffers & streaming */
214 case VIDIOC_REQBUFS:
215 {
216 struct v4l2_requestbuffers *rb = arg;
217
218 if (rb->type != video->queue.type ||
219 rb->memory != V4L2_MEMORY_MMAP)
220 return -EINVAL;
221
222 ret = uvc_alloc_buffers(&video->queue, rb->count,
223 video->imagesize);
224 if (ret < 0)
225 return ret;
226
227 rb->count = ret;
228 ret = 0;
229 break;
230 }
231
232 case VIDIOC_QUERYBUF:
233 {
234 struct v4l2_buffer *buf = arg;
235
236 if (buf->type != video->queue.type)
237 return -EINVAL;
238
239 return uvc_query_buffer(&video->queue, buf);
240 }
241
242 case VIDIOC_QBUF:
243 if ((ret = uvc_queue_buffer(&video->queue, arg)) < 0)
244 return ret;
245
246 return uvc_video_pump(video);
247
248 case VIDIOC_DQBUF:
249 return uvc_dequeue_buffer(&video->queue, arg,
250 file->f_flags & O_NONBLOCK);
251
252 case VIDIOC_STREAMON:
253 {
254 int *type = arg;
255
256 if (*type != video->queue.type)
257 return -EINVAL;
258
259 return uvc_video_enable(video, 1);
260 }
261
262 case VIDIOC_STREAMOFF:
263 {
264 int *type = arg;
265
266 if (*type != video->queue.type)
267 return -EINVAL;
268
269 return uvc_video_enable(video, 0);
270 }
271
272 /* Events */
273 case VIDIOC_DQEVENT:
274 {
275 struct v4l2_event *event = arg;
276
277 ret = v4l2_event_dequeue(&handle->vfh, event,
278 file->f_flags & O_NONBLOCK);
279 if (ret == 0 && event->type == UVC_EVENT_SETUP) {
280 struct uvc_event *uvc_event = (void *)&event->u.data;
281
282 /* Tell the complete callback to generate an event for
283 * the next request that will be enqueued by
284 * uvc_event_write.
285 */
286 uvc->event_setup_out =
287 !(uvc_event->req.bRequestType & USB_DIR_IN);
288 uvc->event_length = uvc_event->req.wLength;
289 }
290
291 return ret;
292 }
293
294 case VIDIOC_SUBSCRIBE_EVENT:
295 {
296 struct v4l2_event_subscription *sub = arg;
297
298 if (sub->type < UVC_EVENT_FIRST || sub->type > UVC_EVENT_LAST)
299 return -EINVAL;
300
301 return v4l2_event_subscribe(&handle->vfh, arg, 2);
302 }
303
304 case VIDIOC_UNSUBSCRIBE_EVENT:
305 return v4l2_event_unsubscribe(&handle->vfh, arg);
306
307 case UVCIOC_SEND_RESPONSE:
308 ret = uvc_send_response(uvc, arg);
309 break;
310
311 default:
312 return -ENOIOCTLCMD;
313 }
314
315 return ret;
316}
317
318static long
319uvc_v4l2_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
320{
321 return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
322}
323
324static int
325uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
326{
327 struct video_device *vdev = video_devdata(file);
328 struct uvc_device *uvc = video_get_drvdata(vdev);
329
330 return uvc_queue_mmap(&uvc->video.queue, vma);
331}
332
333static unsigned int
334uvc_v4l2_poll(struct file *file, poll_table *wait)
335{
336 struct video_device *vdev = video_devdata(file);
337 struct uvc_device *uvc = video_get_drvdata(vdev);
338 struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data);
339 unsigned int mask = 0;
340
341 poll_wait(file, &handle->vfh.wait, wait);
342 if (v4l2_event_pending(&handle->vfh))
343 mask |= POLLPRI;
344
345 mask |= uvc_queue_poll(&uvc->video.queue, file, wait);
346
347 return mask;
348}
349
350static struct v4l2_file_operations uvc_v4l2_fops = {
351 .owner = THIS_MODULE,
352 .open = uvc_v4l2_open,
353 .release = uvc_v4l2_release,
354 .ioctl = uvc_v4l2_ioctl,
355 .mmap = uvc_v4l2_mmap,
356 .poll = uvc_v4l2_poll,
357};
358
1/*
2 * uvc_v4l2.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/list.h>
17#include <linux/mutex.h>
18#include <linux/videodev2.h>
19#include <linux/vmalloc.h>
20#include <linux/wait.h>
21
22#include <media/v4l2-dev.h>
23#include <media/v4l2-event.h>
24#include <media/v4l2-ioctl.h>
25
26#include "uvc.h"
27#include "uvc_queue.h"
28
29/* --------------------------------------------------------------------------
30 * Requests handling
31 */
32
33static int
34uvc_send_response(struct uvc_device *uvc, struct uvc_request_data *data)
35{
36 struct usb_composite_dev *cdev = uvc->func.config->cdev;
37 struct usb_request *req = uvc->control_req;
38
39 if (data->length < 0)
40 return usb_ep_set_halt(cdev->gadget->ep0);
41
42 req->length = min_t(unsigned int, uvc->event_length, data->length);
43 req->zero = data->length < uvc->event_length;
44 req->dma = DMA_ADDR_INVALID;
45
46 memcpy(req->buf, data->data, data->length);
47
48 return usb_ep_queue(cdev->gadget->ep0, req, GFP_KERNEL);
49}
50
51/* --------------------------------------------------------------------------
52 * V4L2
53 */
54
55struct uvc_format
56{
57 u8 bpp;
58 u32 fcc;
59};
60
61static struct uvc_format uvc_formats[] = {
62 { 16, V4L2_PIX_FMT_YUYV },
63 { 0, V4L2_PIX_FMT_MJPEG },
64};
65
66static int
67uvc_v4l2_get_format(struct uvc_video *video, struct v4l2_format *fmt)
68{
69 fmt->fmt.pix.pixelformat = video->fcc;
70 fmt->fmt.pix.width = video->width;
71 fmt->fmt.pix.height = video->height;
72 fmt->fmt.pix.field = V4L2_FIELD_NONE;
73 fmt->fmt.pix.bytesperline = video->bpp * video->width / 8;
74 fmt->fmt.pix.sizeimage = video->imagesize;
75 fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
76 fmt->fmt.pix.priv = 0;
77
78 return 0;
79}
80
81static int
82uvc_v4l2_set_format(struct uvc_video *video, struct v4l2_format *fmt)
83{
84 struct uvc_format *format;
85 unsigned int imagesize;
86 unsigned int bpl;
87 unsigned int i;
88
89 for (i = 0; i < ARRAY_SIZE(uvc_formats); ++i) {
90 format = &uvc_formats[i];
91 if (format->fcc == fmt->fmt.pix.pixelformat)
92 break;
93 }
94
95 if (i == ARRAY_SIZE(uvc_formats)) {
96 printk(KERN_INFO "Unsupported format 0x%08x.\n",
97 fmt->fmt.pix.pixelformat);
98 return -EINVAL;
99 }
100
101 bpl = format->bpp * fmt->fmt.pix.width / 8;
102 imagesize = bpl ? bpl * fmt->fmt.pix.height : fmt->fmt.pix.sizeimage;
103
104 video->fcc = format->fcc;
105 video->bpp = format->bpp;
106 video->width = fmt->fmt.pix.width;
107 video->height = fmt->fmt.pix.height;
108 video->imagesize = imagesize;
109
110 fmt->fmt.pix.field = V4L2_FIELD_NONE;
111 fmt->fmt.pix.bytesperline = bpl;
112 fmt->fmt.pix.sizeimage = imagesize;
113 fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
114 fmt->fmt.pix.priv = 0;
115
116 return 0;
117}
118
119static int
120uvc_v4l2_open(struct file *file)
121{
122 struct video_device *vdev = video_devdata(file);
123 struct uvc_device *uvc = video_get_drvdata(vdev);
124 struct uvc_file_handle *handle;
125
126 handle = kzalloc(sizeof(*handle), GFP_KERNEL);
127 if (handle == NULL)
128 return -ENOMEM;
129
130 v4l2_fh_init(&handle->vfh, vdev);
131 v4l2_fh_add(&handle->vfh);
132
133 handle->device = &uvc->video;
134 file->private_data = &handle->vfh;
135
136 uvc_function_connect(uvc);
137 return 0;
138}
139
140static int
141uvc_v4l2_release(struct file *file)
142{
143 struct video_device *vdev = video_devdata(file);
144 struct uvc_device *uvc = video_get_drvdata(vdev);
145 struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data);
146 struct uvc_video *video = handle->device;
147
148 uvc_function_disconnect(uvc);
149
150 uvc_video_enable(video, 0);
151 mutex_lock(&video->queue.mutex);
152 if (uvc_free_buffers(&video->queue) < 0)
153 printk(KERN_ERR "uvc_v4l2_release: Unable to free "
154 "buffers.\n");
155 mutex_unlock(&video->queue.mutex);
156
157 file->private_data = NULL;
158 v4l2_fh_del(&handle->vfh);
159 v4l2_fh_exit(&handle->vfh);
160 kfree(handle);
161 return 0;
162}
163
164static long
165uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
166{
167 struct video_device *vdev = video_devdata(file);
168 struct uvc_device *uvc = video_get_drvdata(vdev);
169 struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data);
170 struct usb_composite_dev *cdev = uvc->func.config->cdev;
171 struct uvc_video *video = &uvc->video;
172 int ret = 0;
173
174 switch (cmd) {
175 /* Query capabilities */
176 case VIDIOC_QUERYCAP:
177 {
178 struct v4l2_capability *cap = arg;
179
180 memset(cap, 0, sizeof *cap);
181 strncpy(cap->driver, "g_uvc", sizeof(cap->driver));
182 strncpy(cap->card, cdev->gadget->name, sizeof(cap->card));
183 strncpy(cap->bus_info, dev_name(&cdev->gadget->dev),
184 sizeof cap->bus_info);
185 cap->version = DRIVER_VERSION_NUMBER;
186 cap->capabilities = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
187 break;
188 }
189
190 /* Get & Set format */
191 case VIDIOC_G_FMT:
192 {
193 struct v4l2_format *fmt = arg;
194
195 if (fmt->type != video->queue.type)
196 return -EINVAL;
197
198 return uvc_v4l2_get_format(video, fmt);
199 }
200
201 case VIDIOC_S_FMT:
202 {
203 struct v4l2_format *fmt = arg;
204
205 if (fmt->type != video->queue.type)
206 return -EINVAL;
207
208 return uvc_v4l2_set_format(video, fmt);
209 }
210
211 /* Buffers & streaming */
212 case VIDIOC_REQBUFS:
213 {
214 struct v4l2_requestbuffers *rb = arg;
215
216 if (rb->type != video->queue.type ||
217 rb->memory != V4L2_MEMORY_MMAP)
218 return -EINVAL;
219
220 ret = uvc_alloc_buffers(&video->queue, rb->count,
221 video->imagesize);
222 if (ret < 0)
223 return ret;
224
225 rb->count = ret;
226 ret = 0;
227 break;
228 }
229
230 case VIDIOC_QUERYBUF:
231 {
232 struct v4l2_buffer *buf = arg;
233
234 if (buf->type != video->queue.type)
235 return -EINVAL;
236
237 return uvc_query_buffer(&video->queue, buf);
238 }
239
240 case VIDIOC_QBUF:
241 if ((ret = uvc_queue_buffer(&video->queue, arg)) < 0)
242 return ret;
243
244 return uvc_video_pump(video);
245
246 case VIDIOC_DQBUF:
247 return uvc_dequeue_buffer(&video->queue, arg,
248 file->f_flags & O_NONBLOCK);
249
250 case VIDIOC_STREAMON:
251 {
252 int *type = arg;
253
254 if (*type != video->queue.type)
255 return -EINVAL;
256
257 return uvc_video_enable(video, 1);
258 }
259
260 case VIDIOC_STREAMOFF:
261 {
262 int *type = arg;
263
264 if (*type != video->queue.type)
265 return -EINVAL;
266
267 return uvc_video_enable(video, 0);
268 }
269
270 /* Events */
271 case VIDIOC_DQEVENT:
272 {
273 struct v4l2_event *event = arg;
274
275 ret = v4l2_event_dequeue(&handle->vfh, event,
276 file->f_flags & O_NONBLOCK);
277 if (ret == 0 && event->type == UVC_EVENT_SETUP) {
278 struct uvc_event *uvc_event = (void *)&event->u.data;
279
280 /* Tell the complete callback to generate an event for
281 * the next request that will be enqueued by
282 * uvc_event_write.
283 */
284 uvc->event_setup_out =
285 !(uvc_event->req.bRequestType & USB_DIR_IN);
286 uvc->event_length = uvc_event->req.wLength;
287 }
288
289 return ret;
290 }
291
292 case VIDIOC_SUBSCRIBE_EVENT:
293 {
294 struct v4l2_event_subscription *sub = arg;
295
296 if (sub->type < UVC_EVENT_FIRST || sub->type > UVC_EVENT_LAST)
297 return -EINVAL;
298
299 return v4l2_event_subscribe(&handle->vfh, arg, 2, NULL);
300 }
301
302 case VIDIOC_UNSUBSCRIBE_EVENT:
303 return v4l2_event_unsubscribe(&handle->vfh, arg);
304
305 case UVCIOC_SEND_RESPONSE:
306 ret = uvc_send_response(uvc, arg);
307 break;
308
309 default:
310 return -ENOIOCTLCMD;
311 }
312
313 return ret;
314}
315
316static long
317uvc_v4l2_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
318{
319 return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
320}
321
322static int
323uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
324{
325 struct video_device *vdev = video_devdata(file);
326 struct uvc_device *uvc = video_get_drvdata(vdev);
327
328 return uvc_queue_mmap(&uvc->video.queue, vma);
329}
330
331static unsigned int
332uvc_v4l2_poll(struct file *file, poll_table *wait)
333{
334 struct video_device *vdev = video_devdata(file);
335 struct uvc_device *uvc = video_get_drvdata(vdev);
336 struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data);
337 unsigned int mask = 0;
338
339 poll_wait(file, &handle->vfh.wait, wait);
340 if (v4l2_event_pending(&handle->vfh))
341 mask |= POLLPRI;
342
343 mask |= uvc_queue_poll(&uvc->video.queue, file, wait);
344
345 return mask;
346}
347
348static struct v4l2_file_operations uvc_v4l2_fops = {
349 .owner = THIS_MODULE,
350 .open = uvc_v4l2_open,
351 .release = uvc_v4l2_release,
352 .ioctl = uvc_v4l2_ioctl,
353 .mmap = uvc_v4l2_mmap,
354 .poll = uvc_v4l2_poll,
355};
356