Commit | Line | Data |
---|---|---|
cdda479f LP |
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 | ||
35 | static int | |
36 | uvc_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 | ||
57 | struct uvc_format | |
58 | { | |
59 | u8 bpp; | |
60 | u32 fcc; | |
61 | }; | |
62 | ||
63 | static struct uvc_format uvc_formats[] = { | |
64 | { 16, V4L2_PIX_FMT_YUYV }, | |
65 | { 0, V4L2_PIX_FMT_MJPEG }, | |
66 | }; | |
67 | ||
68 | static int | |
69 | uvc_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 | ||
83 | static int | |
84 | uvc_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 (format == NULL || format->fcc != fmt->fmt.pix.pixelformat) { | |
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 | ||
121 | static int | |
122 | uvc_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 | int ret; | |
128 | ||
129 | handle = kzalloc(sizeof(*handle), GFP_KERNEL); | |
130 | if (handle == NULL) | |
131 | return -ENOMEM; | |
132 | ||
133 | ret = v4l2_fh_init(&handle->vfh, vdev); | |
134 | if (ret < 0) | |
135 | goto error; | |
136 | ||
137 | ret = v4l2_event_init(&handle->vfh); | |
138 | if (ret < 0) | |
139 | goto error; | |
140 | ||
141 | ret = v4l2_event_alloc(&handle->vfh, 8); | |
142 | if (ret < 0) | |
143 | goto error; | |
144 | ||
145 | v4l2_fh_add(&handle->vfh); | |
146 | ||
147 | handle->device = &uvc->video; | |
148 | file->private_data = &handle->vfh; | |
149 | ||
150 | uvc_function_connect(uvc); | |
151 | return 0; | |
152 | ||
153 | error: | |
154 | v4l2_fh_exit(&handle->vfh); | |
155 | return ret; | |
156 | } | |
157 | ||
158 | static int | |
159 | uvc_v4l2_release(struct file *file) | |
160 | { | |
161 | struct video_device *vdev = video_devdata(file); | |
162 | struct uvc_device *uvc = video_get_drvdata(vdev); | |
163 | struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data); | |
164 | struct uvc_video *video = handle->device; | |
165 | ||
166 | uvc_function_disconnect(uvc); | |
167 | ||
168 | uvc_video_enable(video, 0); | |
169 | mutex_lock(&video->queue.mutex); | |
170 | if (uvc_free_buffers(&video->queue) < 0) | |
171 | printk(KERN_ERR "uvc_v4l2_release: Unable to free " | |
172 | "buffers.\n"); | |
173 | mutex_unlock(&video->queue.mutex); | |
174 | ||
175 | file->private_data = NULL; | |
176 | v4l2_fh_del(&handle->vfh); | |
177 | v4l2_fh_exit(&handle->vfh); | |
178 | kfree(handle); | |
179 | return 0; | |
180 | } | |
181 | ||
182 | static long | |
183 | uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg) | |
184 | { | |
185 | struct video_device *vdev = video_devdata(file); | |
186 | struct uvc_device *uvc = video_get_drvdata(vdev); | |
187 | struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data); | |
188 | struct usb_composite_dev *cdev = uvc->func.config->cdev; | |
189 | struct uvc_video *video = &uvc->video; | |
190 | int ret = 0; | |
191 | ||
192 | switch (cmd) { | |
193 | /* Query capabilities */ | |
194 | case VIDIOC_QUERYCAP: | |
195 | { | |
196 | struct v4l2_capability *cap = arg; | |
197 | ||
198 | memset(cap, 0, sizeof *cap); | |
199 | strncpy(cap->driver, "g_uvc", sizeof(cap->driver)); | |
200 | strncpy(cap->card, cdev->gadget->name, sizeof(cap->card)); | |
201 | strncpy(cap->bus_info, dev_name(&cdev->gadget->dev), | |
202 | sizeof cap->bus_info); | |
203 | cap->version = DRIVER_VERSION_NUMBER; | |
204 | cap->capabilities = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING; | |
205 | break; | |
206 | } | |
207 | ||
208 | /* Get & Set format */ | |
209 | case VIDIOC_G_FMT: | |
210 | { | |
211 | struct v4l2_format *fmt = arg; | |
212 | ||
213 | if (fmt->type != video->queue.type) | |
214 | return -EINVAL; | |
215 | ||
216 | return uvc_v4l2_get_format(video, fmt); | |
217 | } | |
218 | ||
219 | case VIDIOC_S_FMT: | |
220 | { | |
221 | struct v4l2_format *fmt = arg; | |
222 | ||
223 | if (fmt->type != video->queue.type) | |
224 | return -EINVAL; | |
225 | ||
226 | return uvc_v4l2_set_format(video, fmt); | |
227 | } | |
228 | ||
229 | /* Buffers & streaming */ | |
230 | case VIDIOC_REQBUFS: | |
231 | { | |
232 | struct v4l2_requestbuffers *rb = arg; | |
233 | ||
234 | if (rb->type != video->queue.type || | |
235 | rb->memory != V4L2_MEMORY_MMAP) | |
236 | return -EINVAL; | |
237 | ||
238 | ret = uvc_alloc_buffers(&video->queue, rb->count, | |
239 | video->imagesize); | |
240 | if (ret < 0) | |
241 | return ret; | |
242 | ||
243 | rb->count = ret; | |
244 | ret = 0; | |
245 | break; | |
246 | } | |
247 | ||
248 | case VIDIOC_QUERYBUF: | |
249 | { | |
250 | struct v4l2_buffer *buf = arg; | |
251 | ||
252 | if (buf->type != video->queue.type) | |
253 | return -EINVAL; | |
254 | ||
255 | return uvc_query_buffer(&video->queue, buf); | |
256 | } | |
257 | ||
258 | case VIDIOC_QBUF: | |
259 | if ((ret = uvc_queue_buffer(&video->queue, arg)) < 0) | |
260 | return ret; | |
261 | ||
262 | return uvc_video_pump(video); | |
263 | ||
264 | case VIDIOC_DQBUF: | |
265 | return uvc_dequeue_buffer(&video->queue, arg, | |
266 | file->f_flags & O_NONBLOCK); | |
267 | ||
268 | case VIDIOC_STREAMON: | |
269 | { | |
270 | int *type = arg; | |
271 | ||
272 | if (*type != video->queue.type) | |
273 | return -EINVAL; | |
274 | ||
275 | return uvc_video_enable(video, 1); | |
276 | } | |
277 | ||
278 | case VIDIOC_STREAMOFF: | |
279 | { | |
280 | int *type = arg; | |
281 | ||
282 | if (*type != video->queue.type) | |
283 | return -EINVAL; | |
284 | ||
285 | return uvc_video_enable(video, 0); | |
286 | } | |
287 | ||
288 | /* Events */ | |
289 | case VIDIOC_DQEVENT: | |
290 | { | |
291 | struct v4l2_event *event = arg; | |
292 | ||
293 | ret = v4l2_event_dequeue(&handle->vfh, event, | |
294 | file->f_flags & O_NONBLOCK); | |
295 | if (ret == 0 && event->type == UVC_EVENT_SETUP) { | |
296 | struct uvc_event *uvc_event = (void *)&event->u.data; | |
297 | ||
298 | /* Tell the complete callback to generate an event for | |
299 | * the next request that will be enqueued by | |
300 | * uvc_event_write. | |
301 | */ | |
302 | uvc->event_setup_out = | |
303 | !(uvc_event->req.bRequestType & USB_DIR_IN); | |
304 | uvc->event_length = uvc_event->req.wLength; | |
305 | } | |
306 | ||
307 | return ret; | |
308 | } | |
309 | ||
310 | case VIDIOC_SUBSCRIBE_EVENT: | |
311 | { | |
312 | struct v4l2_event_subscription *sub = arg; | |
313 | ||
314 | if (sub->type < UVC_EVENT_FIRST || sub->type > UVC_EVENT_LAST) | |
315 | return -EINVAL; | |
316 | ||
317 | return v4l2_event_subscribe(&handle->vfh, arg); | |
318 | } | |
319 | ||
320 | case VIDIOC_UNSUBSCRIBE_EVENT: | |
321 | return v4l2_event_unsubscribe(&handle->vfh, arg); | |
322 | ||
323 | case UVCIOC_SEND_RESPONSE: | |
324 | ret = uvc_send_response(uvc, arg); | |
325 | break; | |
326 | ||
327 | default: | |
328 | return -ENOIOCTLCMD; | |
329 | } | |
330 | ||
331 | return ret; | |
332 | } | |
333 | ||
334 | static long | |
335 | uvc_v4l2_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
336 | { | |
337 | return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl); | |
338 | } | |
339 | ||
340 | static int | |
341 | uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma) | |
342 | { | |
343 | struct video_device *vdev = video_devdata(file); | |
344 | struct uvc_device *uvc = video_get_drvdata(vdev); | |
345 | ||
346 | return uvc_queue_mmap(&uvc->video.queue, vma); | |
347 | } | |
348 | ||
349 | static unsigned int | |
350 | uvc_v4l2_poll(struct file *file, poll_table *wait) | |
351 | { | |
352 | struct video_device *vdev = video_devdata(file); | |
353 | struct uvc_device *uvc = video_get_drvdata(vdev); | |
354 | struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data); | |
355 | unsigned int mask = 0; | |
356 | ||
357 | poll_wait(file, &handle->vfh.events->wait, wait); | |
358 | if (v4l2_event_pending(&handle->vfh)) | |
359 | mask |= POLLPRI; | |
360 | ||
361 | mask |= uvc_queue_poll(&uvc->video.queue, file, wait); | |
362 | ||
363 | return mask; | |
364 | } | |
365 | ||
366 | struct v4l2_file_operations uvc_v4l2_fops = { | |
367 | .owner = THIS_MODULE, | |
368 | .open = uvc_v4l2_open, | |
369 | .release = uvc_v4l2_release, | |
370 | .ioctl = uvc_v4l2_ioctl, | |
371 | .mmap = uvc_v4l2_mmap, | |
372 | .poll = uvc_v4l2_poll, | |
373 | }; | |
374 |