aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/video/v4l2-subdev.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/media/video/v4l2-subdev.c')
-rw-r--r--drivers/media/video/v4l2-subdev.c332
1 files changed, 332 insertions, 0 deletions
diff --git a/drivers/media/video/v4l2-subdev.c b/drivers/media/video/v4l2-subdev.c
new file mode 100644
index 000000000000..0b8064490676
--- /dev/null
+++ b/drivers/media/video/v4l2-subdev.c
@@ -0,0 +1,332 @@
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
34static 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
49static 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
58static 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
112err:
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
125static 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
147static 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_subdev_queryctrl(sd, arg);
159
160 case VIDIOC_QUERYMENU:
161 return v4l2_subdev_querymenu(sd, arg);
162
163 case VIDIOC_G_CTRL:
164 return v4l2_subdev_g_ctrl(sd, arg);
165
166 case VIDIOC_S_CTRL:
167 return v4l2_subdev_s_ctrl(sd, arg);
168
169 case VIDIOC_G_EXT_CTRLS:
170 return v4l2_subdev_g_ext_ctrls(sd, arg);
171
172 case VIDIOC_S_EXT_CTRLS:
173 return v4l2_subdev_s_ext_ctrls(sd, arg);
174
175 case VIDIOC_TRY_EXT_CTRLS:
176 return v4l2_subdev_try_ext_ctrls(sd, 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
285static 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
291static 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
308const 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
316void 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}
332EXPORT_SYMBOL(v4l2_subdev_init);
generated by cgit v1.2.2 (git 2.25.0) at 2025-04-28 15:06:06 -0400