Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas...
[linux-2.6.git] / drivers / media / video / v4l2-subdev.c
1 /*
2  * V4L2 sub-device
3  *
4  * Copyright (C) 2010 Nokia Corporation
5  *
6  * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
7  *          Sakari Ailus <sakari.ailus@iki.fi>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21  */
22
23 #include <linux/ioctl.h>
24 #include <linux/slab.h>
25 #include <linux/types.h>
26 #include <linux/videodev2.h>
27
28 #include <media/v4l2-ctrls.h>
29 #include <media/v4l2-device.h>
30 #include <media/v4l2-ioctl.h>
31 #include <media/v4l2-fh.h>
32 #include <media/v4l2-event.h>
33
34 static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
35 {
36 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
37         /* Allocate try format and crop in the same memory block */
38         fh->try_fmt = kzalloc((sizeof(*fh->try_fmt) + sizeof(*fh->try_crop))
39                               * sd->entity.num_pads, GFP_KERNEL);
40         if (fh->try_fmt == NULL)
41                 return -ENOMEM;
42
43         fh->try_crop = (struct v4l2_rect *)
44                 (fh->try_fmt + sd->entity.num_pads);
45 #endif
46         return 0;
47 }
48
49 static void subdev_fh_free(struct v4l2_subdev_fh *fh)
50 {
51 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
52         kfree(fh->try_fmt);
53         fh->try_fmt = NULL;
54         fh->try_crop = NULL;
55 #endif
56 }
57
58 static int subdev_open(struct file *file)
59 {
60         struct video_device *vdev = video_devdata(file);
61         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
62         struct v4l2_subdev_fh *subdev_fh;
63 #if defined(CONFIG_MEDIA_CONTROLLER)
64         struct media_entity *entity = NULL;
65 #endif
66         int ret;
67
68         subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
69         if (subdev_fh == NULL)
70                 return -ENOMEM;
71
72         ret = subdev_fh_init(subdev_fh, sd);
73         if (ret) {
74                 kfree(subdev_fh);
75                 return ret;
76         }
77
78         ret = v4l2_fh_init(&subdev_fh->vfh, vdev);
79         if (ret)
80                 goto err;
81
82         if (sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS) {
83                 ret = v4l2_event_init(&subdev_fh->vfh);
84                 if (ret)
85                         goto err;
86
87                 ret = v4l2_event_alloc(&subdev_fh->vfh, sd->nevents);
88                 if (ret)
89                         goto err;
90         }
91
92         v4l2_fh_add(&subdev_fh->vfh);
93         file->private_data = &subdev_fh->vfh;
94 #if defined(CONFIG_MEDIA_CONTROLLER)
95         if (sd->v4l2_dev->mdev) {
96                 entity = media_entity_get(&sd->entity);
97                 if (!entity) {
98                         ret = -EBUSY;
99                         goto err;
100                 }
101         }
102 #endif
103
104         if (sd->internal_ops && sd->internal_ops->open) {
105                 ret = sd->internal_ops->open(sd, subdev_fh);
106                 if (ret < 0)
107                         goto err;
108         }
109
110         return 0;
111
112 err:
113 #if defined(CONFIG_MEDIA_CONTROLLER)
114         if (entity)
115                 media_entity_put(entity);
116 #endif
117         v4l2_fh_del(&subdev_fh->vfh);
118         v4l2_fh_exit(&subdev_fh->vfh);
119         subdev_fh_free(subdev_fh);
120         kfree(subdev_fh);
121
122         return ret;
123 }
124
125 static int subdev_close(struct file *file)
126 {
127         struct video_device *vdev = video_devdata(file);
128         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
129         struct v4l2_fh *vfh = file->private_data;
130         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
131
132         if (sd->internal_ops && sd->internal_ops->close)
133                 sd->internal_ops->close(sd, subdev_fh);
134 #if defined(CONFIG_MEDIA_CONTROLLER)
135         if (sd->v4l2_dev->mdev)
136                 media_entity_put(&sd->entity);
137 #endif
138         v4l2_fh_del(vfh);
139         v4l2_fh_exit(vfh);
140         subdev_fh_free(subdev_fh);
141         kfree(subdev_fh);
142         file->private_data = NULL;
143
144         return 0;
145 }
146
147 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
148 {
149         struct video_device *vdev = video_devdata(file);
150         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
151         struct v4l2_fh *vfh = file->private_data;
152 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
153         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
154 #endif
155
156         switch (cmd) {
157         case VIDIOC_QUERYCTRL:
158                 return v4l2_queryctrl(sd->ctrl_handler, arg);
159
160         case VIDIOC_QUERYMENU:
161                 return v4l2_querymenu(sd->ctrl_handler, arg);
162
163         case VIDIOC_G_CTRL:
164                 return v4l2_g_ctrl(sd->ctrl_handler, arg);
165
166         case VIDIOC_S_CTRL:
167                 return v4l2_s_ctrl(sd->ctrl_handler, arg);
168
169         case VIDIOC_G_EXT_CTRLS:
170                 return v4l2_g_ext_ctrls(sd->ctrl_handler, arg);
171
172         case VIDIOC_S_EXT_CTRLS:
173                 return v4l2_s_ext_ctrls(sd->ctrl_handler, arg);
174
175         case VIDIOC_TRY_EXT_CTRLS:
176                 return v4l2_try_ext_ctrls(sd->ctrl_handler, arg);
177
178         case VIDIOC_DQEVENT:
179                 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
180                         return -ENOIOCTLCMD;
181
182                 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
183
184         case VIDIOC_SUBSCRIBE_EVENT:
185                 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
186
187         case VIDIOC_UNSUBSCRIBE_EVENT:
188                 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
189 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
190         case VIDIOC_SUBDEV_G_FMT: {
191                 struct v4l2_subdev_format *format = arg;
192
193                 if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
194                     format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
195                         return -EINVAL;
196
197                 if (format->pad >= sd->entity.num_pads)
198                         return -EINVAL;
199
200                 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh, format);
201         }
202
203         case VIDIOC_SUBDEV_S_FMT: {
204                 struct v4l2_subdev_format *format = arg;
205
206                 if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
207                     format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
208                         return -EINVAL;
209
210                 if (format->pad >= sd->entity.num_pads)
211                         return -EINVAL;
212
213                 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh, format);
214         }
215
216         case VIDIOC_SUBDEV_G_CROP: {
217                 struct v4l2_subdev_crop *crop = arg;
218
219                 if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
220                     crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
221                         return -EINVAL;
222
223                 if (crop->pad >= sd->entity.num_pads)
224                         return -EINVAL;
225
226                 return v4l2_subdev_call(sd, pad, get_crop, subdev_fh, crop);
227         }
228
229         case VIDIOC_SUBDEV_S_CROP: {
230                 struct v4l2_subdev_crop *crop = arg;
231
232                 if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
233                     crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
234                         return -EINVAL;
235
236                 if (crop->pad >= sd->entity.num_pads)
237                         return -EINVAL;
238
239                 return v4l2_subdev_call(sd, pad, set_crop, subdev_fh, crop);
240         }
241
242         case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
243                 struct v4l2_subdev_mbus_code_enum *code = arg;
244
245                 if (code->pad >= sd->entity.num_pads)
246                         return -EINVAL;
247
248                 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh,
249                                         code);
250         }
251
252         case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
253                 struct v4l2_subdev_frame_size_enum *fse = arg;
254
255                 if (fse->pad >= sd->entity.num_pads)
256                         return -EINVAL;
257
258                 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh,
259                                         fse);
260         }
261
262         case VIDIOC_SUBDEV_G_FRAME_INTERVAL:
263                 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
264
265         case VIDIOC_SUBDEV_S_FRAME_INTERVAL:
266                 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
267
268         case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
269                 struct v4l2_subdev_frame_interval_enum *fie = arg;
270
271                 if (fie->pad >= sd->entity.num_pads)
272                         return -EINVAL;
273
274                 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh,
275                                         fie);
276         }
277 #endif
278         default:
279                 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
280         }
281
282         return 0;
283 }
284
285 static long subdev_ioctl(struct file *file, unsigned int cmd,
286         unsigned long arg)
287 {
288         return video_usercopy(file, cmd, arg, subdev_do_ioctl);
289 }
290
291 static unsigned int subdev_poll(struct file *file, poll_table *wait)
292 {
293         struct video_device *vdev = video_devdata(file);
294         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
295         struct v4l2_fh *fh = file->private_data;
296
297         if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
298                 return POLLERR;
299
300         poll_wait(file, &fh->events->wait, wait);
301
302         if (v4l2_event_pending(fh))
303                 return POLLPRI;
304
305         return 0;
306 }
307
308 const struct v4l2_file_operations v4l2_subdev_fops = {
309         .owner = THIS_MODULE,
310         .open = subdev_open,
311         .unlocked_ioctl = subdev_ioctl,
312         .release = subdev_close,
313         .poll = subdev_poll,
314 };
315
316 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
317 {
318         INIT_LIST_HEAD(&sd->list);
319         BUG_ON(!ops);
320         sd->ops = ops;
321         sd->v4l2_dev = NULL;
322         sd->flags = 0;
323         sd->name[0] = '\0';
324         sd->grp_id = 0;
325         sd->dev_priv = NULL;
326         sd->host_priv = NULL;
327 #if defined(CONFIG_MEDIA_CONTROLLER)
328         sd->entity.name = sd->name;
329         sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV;
330 #endif
331 }
332 EXPORT_SYMBOL(v4l2_subdev_init);