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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. | |
cdda479f LP |
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> | |
cdda479f LP |
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 | |
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 | ||
6f6543f5 | 42 | req->length = min_t(unsigned int, uvc->event_length, data->length); |
cdda479f LP |
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 | |
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 | |
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 | ||
9a887162 | 95 | if (i == ARRAY_SIZE(uvc_formats)) { |
cdda479f LP |
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 | |
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; | |
cdda479f LP |
125 | |
126 | handle = kzalloc(sizeof(*handle), GFP_KERNEL); | |
127 | if (handle == NULL) | |
128 | return -ENOMEM; | |
129 | ||
523f46d6 | 130 | v4l2_fh_init(&handle->vfh, vdev); |
cdda479f LP |
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; | |
cdda479f LP |
138 | } |
139 | ||
140 | static int | |
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 | |
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 | ||
c53c2549 | 299 | return v4l2_event_subscribe(&handle->vfh, arg, 2, NULL); |
cdda479f LP |
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 | |
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 | |
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 | |
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 | ||
523f46d6 | 339 | poll_wait(file, &handle->vfh.wait, wait); |
cdda479f LP |
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 | ||
5d9955f8 | 348 | static struct v4l2_file_operations uvc_v4l2_fops = { |
cdda479f LP |
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 |