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[karo-tx-linux.git] / drivers / usb / gadget / uvc_v4l2.c
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 (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
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 static 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