media: v4l2-compat-ioctl32.c: add capabilities field to, v4l2_input32
[pandora-kernel.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 #include <linux/export.h>
28
29 #include <media/v4l2-ctrls.h>
30 #include <media/v4l2-device.h>
31 #include <media/v4l2-ioctl.h>
32 #include <media/v4l2-fh.h>
33 #include <media/v4l2-event.h>
34
35 static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
36 {
37 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
38         /* Allocate try format and crop in the same memory block */
39         fh->try_fmt = kzalloc((sizeof(*fh->try_fmt) + sizeof(*fh->try_crop))
40                               * sd->entity.num_pads, GFP_KERNEL);
41         if (fh->try_fmt == NULL)
42                 return -ENOMEM;
43
44         fh->try_crop = (struct v4l2_rect *)
45                 (fh->try_fmt + sd->entity.num_pads);
46 #endif
47         return 0;
48 }
49
50 static void subdev_fh_free(struct v4l2_subdev_fh *fh)
51 {
52 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
53         kfree(fh->try_fmt);
54         fh->try_fmt = NULL;
55         fh->try_crop = NULL;
56 #endif
57 }
58
59 static int subdev_open(struct file *file)
60 {
61         struct video_device *vdev = video_devdata(file);
62         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
63         struct v4l2_subdev_fh *subdev_fh;
64 #if defined(CONFIG_MEDIA_CONTROLLER)
65         struct media_entity *entity = NULL;
66 #endif
67         int ret;
68
69         subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
70         if (subdev_fh == NULL)
71                 return -ENOMEM;
72
73         ret = subdev_fh_init(subdev_fh, sd);
74         if (ret) {
75                 kfree(subdev_fh);
76                 return ret;
77         }
78
79         v4l2_fh_init(&subdev_fh->vfh, vdev);
80         v4l2_fh_add(&subdev_fh->vfh);
81         file->private_data = &subdev_fh->vfh;
82 #if defined(CONFIG_MEDIA_CONTROLLER)
83         if (sd->v4l2_dev->mdev) {
84                 entity = media_entity_get(&sd->entity);
85                 if (!entity) {
86                         ret = -EBUSY;
87                         goto err;
88                 }
89         }
90 #endif
91
92         if (sd->internal_ops && sd->internal_ops->open) {
93                 ret = sd->internal_ops->open(sd, subdev_fh);
94                 if (ret < 0)
95                         goto err;
96         }
97
98         return 0;
99
100 err:
101 #if defined(CONFIG_MEDIA_CONTROLLER)
102         if (entity)
103                 media_entity_put(entity);
104 #endif
105         v4l2_fh_del(&subdev_fh->vfh);
106         v4l2_fh_exit(&subdev_fh->vfh);
107         subdev_fh_free(subdev_fh);
108         kfree(subdev_fh);
109
110         return ret;
111 }
112
113 static int subdev_close(struct file *file)
114 {
115         struct video_device *vdev = video_devdata(file);
116         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
117         struct v4l2_fh *vfh = file->private_data;
118         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
119
120         if (sd->internal_ops && sd->internal_ops->close)
121                 sd->internal_ops->close(sd, subdev_fh);
122 #if defined(CONFIG_MEDIA_CONTROLLER)
123         if (sd->v4l2_dev->mdev)
124                 media_entity_put(&sd->entity);
125 #endif
126         v4l2_fh_del(vfh);
127         v4l2_fh_exit(vfh);
128         subdev_fh_free(subdev_fh);
129         kfree(subdev_fh);
130         file->private_data = NULL;
131
132         return 0;
133 }
134
135 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
136 {
137         struct video_device *vdev = video_devdata(file);
138         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
139         struct v4l2_fh *vfh = file->private_data;
140 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
141         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
142 #endif
143
144         switch (cmd) {
145         case VIDIOC_QUERYCTRL:
146                 return v4l2_queryctrl(vfh->ctrl_handler, arg);
147
148         case VIDIOC_QUERYMENU:
149                 return v4l2_querymenu(vfh->ctrl_handler, arg);
150
151         case VIDIOC_G_CTRL:
152                 return v4l2_g_ctrl(vfh->ctrl_handler, arg);
153
154         case VIDIOC_S_CTRL:
155                 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
156
157         case VIDIOC_G_EXT_CTRLS:
158                 return v4l2_g_ext_ctrls(vfh->ctrl_handler, arg);
159
160         case VIDIOC_S_EXT_CTRLS:
161                 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, arg);
162
163         case VIDIOC_TRY_EXT_CTRLS:
164                 return v4l2_try_ext_ctrls(vfh->ctrl_handler, arg);
165
166         case VIDIOC_DQEVENT:
167                 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
168                         return -ENOIOCTLCMD;
169
170                 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
171
172         case VIDIOC_SUBSCRIBE_EVENT:
173                 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
174
175         case VIDIOC_UNSUBSCRIBE_EVENT:
176                 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
177
178 #ifdef CONFIG_VIDEO_ADV_DEBUG
179         case VIDIOC_DBG_G_REGISTER:
180         {
181                 struct v4l2_dbg_register *p = arg;
182
183                 if (!capable(CAP_SYS_ADMIN))
184                         return -EPERM;
185                 return v4l2_subdev_call(sd, core, g_register, p);
186         }
187         case VIDIOC_DBG_S_REGISTER:
188         {
189                 struct v4l2_dbg_register *p = arg;
190
191                 if (!capable(CAP_SYS_ADMIN))
192                         return -EPERM;
193                 return v4l2_subdev_call(sd, core, s_register, p);
194         }
195 #endif
196 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
197         case VIDIOC_SUBDEV_G_FMT: {
198                 struct v4l2_subdev_format *format = arg;
199
200                 if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
201                     format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
202                         return -EINVAL;
203
204                 if (format->pad >= sd->entity.num_pads)
205                         return -EINVAL;
206
207                 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh, format);
208         }
209
210         case VIDIOC_SUBDEV_S_FMT: {
211                 struct v4l2_subdev_format *format = arg;
212
213                 if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
214                     format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
215                         return -EINVAL;
216
217                 if (format->pad >= sd->entity.num_pads)
218                         return -EINVAL;
219
220                 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh, format);
221         }
222
223         case VIDIOC_SUBDEV_G_CROP: {
224                 struct v4l2_subdev_crop *crop = arg;
225
226                 if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
227                     crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
228                         return -EINVAL;
229
230                 if (crop->pad >= sd->entity.num_pads)
231                         return -EINVAL;
232
233                 return v4l2_subdev_call(sd, pad, get_crop, subdev_fh, crop);
234         }
235
236         case VIDIOC_SUBDEV_S_CROP: {
237                 struct v4l2_subdev_crop *crop = arg;
238
239                 if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
240                     crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
241                         return -EINVAL;
242
243                 if (crop->pad >= sd->entity.num_pads)
244                         return -EINVAL;
245
246                 return v4l2_subdev_call(sd, pad, set_crop, subdev_fh, crop);
247         }
248
249         case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
250                 struct v4l2_subdev_mbus_code_enum *code = arg;
251
252                 if (code->pad >= sd->entity.num_pads)
253                         return -EINVAL;
254
255                 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh,
256                                         code);
257         }
258
259         case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
260                 struct v4l2_subdev_frame_size_enum *fse = arg;
261
262                 if (fse->pad >= sd->entity.num_pads)
263                         return -EINVAL;
264
265                 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh,
266                                         fse);
267         }
268
269         case VIDIOC_SUBDEV_G_FRAME_INTERVAL:
270                 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
271
272         case VIDIOC_SUBDEV_S_FRAME_INTERVAL:
273                 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
274
275         case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
276                 struct v4l2_subdev_frame_interval_enum *fie = arg;
277
278                 if (fie->pad >= sd->entity.num_pads)
279                         return -EINVAL;
280
281                 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh,
282                                         fie);
283         }
284 #endif
285         default:
286                 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
287         }
288
289         return 0;
290 }
291
292 static long subdev_ioctl(struct file *file, unsigned int cmd,
293         unsigned long arg)
294 {
295         return video_usercopy(file, cmd, arg, subdev_do_ioctl);
296 }
297
298 static unsigned int subdev_poll(struct file *file, poll_table *wait)
299 {
300         struct video_device *vdev = video_devdata(file);
301         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
302         struct v4l2_fh *fh = file->private_data;
303
304         if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
305                 return POLLERR;
306
307         poll_wait(file, &fh->wait, wait);
308
309         if (v4l2_event_pending(fh))
310                 return POLLPRI;
311
312         return 0;
313 }
314
315 const struct v4l2_file_operations v4l2_subdev_fops = {
316         .owner = THIS_MODULE,
317         .open = subdev_open,
318         .unlocked_ioctl = subdev_ioctl,
319         .release = subdev_close,
320         .poll = subdev_poll,
321 };
322
323 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
324 {
325         INIT_LIST_HEAD(&sd->list);
326         BUG_ON(!ops);
327         sd->ops = ops;
328         sd->v4l2_dev = NULL;
329         sd->flags = 0;
330         sd->name[0] = '\0';
331         sd->grp_id = 0;
332         sd->dev_priv = NULL;
333         sd->host_priv = NULL;
334 #if defined(CONFIG_MEDIA_CONTROLLER)
335         sd->entity.name = sd->name;
336         sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV;
337 #endif
338 }
339 EXPORT_SYMBOL(v4l2_subdev_init);