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
33 static int
uvc_send_response(struct uvc_device * uvc,struct uvc_request_data * data)34 uvc_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
55 struct uvc_format
56 {
57 u8 bpp;
58 u32 fcc;
59 };
60
61 static struct uvc_format uvc_formats[] = {
62 { 16, V4L2_PIX_FMT_YUYV },
63 { 0, V4L2_PIX_FMT_MJPEG },
64 };
65
66 static int
uvc_v4l2_get_format(struct uvc_video * video,struct v4l2_format * fmt)67 uvc_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
81 static int
uvc_v4l2_set_format(struct uvc_video * video,struct v4l2_format * fmt)82 uvc_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
119 static int
uvc_v4l2_open(struct file * file)120 uvc_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
140 static int
uvc_v4l2_release(struct file * file)141 uvc_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
164 static long
uvc_v4l2_do_ioctl(struct file * file,unsigned int cmd,void * arg)165 uvc_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);
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
316 static long
uvc_v4l2_ioctl(struct file * file,unsigned int cmd,unsigned long arg)317 uvc_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
322 static int
uvc_v4l2_mmap(struct file * file,struct vm_area_struct * vma)323 uvc_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
331 static unsigned int
uvc_v4l2_poll(struct file * file,poll_table * wait)332 uvc_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
348 static 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
357