b7967c9dc4ae917c16cec58da1ac16b947bedd50
[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         v4l2_fh_init(&subdev_fh->vfh, vdev);
79         v4l2_fh_add(&subdev_fh->vfh);
80         file->private_data = &subdev_fh->vfh;
81 #if defined(CONFIG_MEDIA_CONTROLLER)
82         if (sd->v4l2_dev->mdev) {
83                 entity = media_entity_get(&sd->entity);
84                 if (!entity) {
85                         ret = -EBUSY;
86                         goto err;
87                 }
88         }
89 #endif
90
91         if (sd->internal_ops && sd->internal_ops->open) {
92                 ret = sd->internal_ops->open(sd, subdev_fh);
93                 if (ret < 0)
94                         goto err;
95         }
96
97         return 0;
98
99 err:
100 #if defined(CONFIG_MEDIA_CONTROLLER)
101         if (entity)
102                 media_entity_put(entity);
103 #endif
104         v4l2_fh_del(&subdev_fh->vfh);
105         v4l2_fh_exit(&subdev_fh->vfh);
106         subdev_fh_free(subdev_fh);
107         kfree(subdev_fh);
108
109         return ret;
110 }
111
112 static int subdev_close(struct file *file)
113 {
114         struct video_device *vdev = video_devdata(file);
115         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
116         struct v4l2_fh *vfh = file->private_data;
117         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
118
119         if (sd->internal_ops && sd->internal_ops->close)
120                 sd->internal_ops->close(sd, subdev_fh);
121 #if defined(CONFIG_MEDIA_CONTROLLER)
122         if (sd->v4l2_dev->mdev)
123                 media_entity_put(&sd->entity);
124 #endif
125         v4l2_fh_del(vfh);
126         v4l2_fh_exit(vfh);
127         subdev_fh_free(subdev_fh);
128         kfree(subdev_fh);
129         file->private_data = NULL;
130
131         return 0;
132 }
133
134 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
135 {
136         struct video_device *vdev = video_devdata(file);
137         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
138         struct v4l2_fh *vfh = file->private_data;
139 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
140         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
141 #endif
142
143         switch (cmd) {
144         case VIDIOC_QUERYCTRL:
145                 return v4l2_queryctrl(vfh->ctrl_handler, arg);
146
147         case VIDIOC_QUERYMENU:
148                 return v4l2_querymenu(vfh->ctrl_handler, arg);
149
150         case VIDIOC_G_CTRL:
151                 return v4l2_g_ctrl(vfh->ctrl_handler, arg);
152
153         case VIDIOC_S_CTRL:
154                 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
155
156         case VIDIOC_G_EXT_CTRLS:
157                 return v4l2_g_ext_ctrls(vfh->ctrl_handler, arg);
158
159         case VIDIOC_S_EXT_CTRLS:
160                 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, arg);
161
162         case VIDIOC_TRY_EXT_CTRLS:
163                 return v4l2_try_ext_ctrls(vfh->ctrl_handler, arg);
164
165         case VIDIOC_DQEVENT:
166                 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
167                         return -ENOIOCTLCMD;
168
169                 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
170
171         case VIDIOC_SUBSCRIBE_EVENT:
172                 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
173
174         case VIDIOC_UNSUBSCRIBE_EVENT:
175                 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
176 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
177         case VIDIOC_SUBDEV_G_FMT: {
178                 struct v4l2_subdev_format *format = arg;
179
180                 if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
181                     format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
182                         return -EINVAL;
183
184                 if (format->pad >= sd->entity.num_pads)
185                         return -EINVAL;
186
187                 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh, format);
188         }
189
190         case VIDIOC_SUBDEV_S_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, set_fmt, subdev_fh, format);
201         }
202
203         case VIDIOC_SUBDEV_G_CROP: {
204                 struct v4l2_subdev_crop *crop = arg;
205
206                 if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
207                     crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
208                         return -EINVAL;
209
210                 if (crop->pad >= sd->entity.num_pads)
211                         return -EINVAL;
212
213                 return v4l2_subdev_call(sd, pad, get_crop, subdev_fh, crop);
214         }
215
216         case VIDIOC_SUBDEV_S_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, set_crop, subdev_fh, crop);
227         }
228
229         case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
230                 struct v4l2_subdev_mbus_code_enum *code = arg;
231
232                 if (code->pad >= sd->entity.num_pads)
233                         return -EINVAL;
234
235                 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh,
236                                         code);
237         }
238
239         case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
240                 struct v4l2_subdev_frame_size_enum *fse = arg;
241
242                 if (fse->pad >= sd->entity.num_pads)
243                         return -EINVAL;
244
245                 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh,
246                                         fse);
247         }
248
249         case VIDIOC_SUBDEV_G_FRAME_INTERVAL:
250                 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
251
252         case VIDIOC_SUBDEV_S_FRAME_INTERVAL:
253                 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
254
255         case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
256                 struct v4l2_subdev_frame_interval_enum *fie = arg;
257
258                 if (fie->pad >= sd->entity.num_pads)
259                         return -EINVAL;
260
261                 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh,
262                                         fie);
263         }
264 #endif
265         default:
266                 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
267         }
268
269         return 0;
270 }
271
272 static long subdev_ioctl(struct file *file, unsigned int cmd,
273         unsigned long arg)
274 {
275         return video_usercopy(file, cmd, arg, subdev_do_ioctl);
276 }
277
278 static unsigned int subdev_poll(struct file *file, poll_table *wait)
279 {
280         struct video_device *vdev = video_devdata(file);
281         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
282         struct v4l2_fh *fh = file->private_data;
283
284         if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
285                 return POLLERR;
286
287         poll_wait(file, &fh->wait, wait);
288
289         if (v4l2_event_pending(fh))
290                 return POLLPRI;
291
292         return 0;
293 }
294
295 const struct v4l2_file_operations v4l2_subdev_fops = {
296         .owner = THIS_MODULE,
297         .open = subdev_open,
298         .unlocked_ioctl = subdev_ioctl,
299         .release = subdev_close,
300         .poll = subdev_poll,
301 };
302
303 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
304 {
305         INIT_LIST_HEAD(&sd->list);
306         BUG_ON(!ops);
307         sd->ops = ops;
308         sd->v4l2_dev = NULL;
309         sd->flags = 0;
310         sd->name[0] = '\0';
311         sd->grp_id = 0;
312         sd->dev_priv = NULL;
313         sd->host_priv = NULL;
314 #if defined(CONFIG_MEDIA_CONTROLLER)
315         sd->entity.name = sd->name;
316         sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV;
317 #endif
318 }
319 EXPORT_SYMBOL(v4l2_subdev_init);