tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
35static 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
50static 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
59static 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
100err:
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
113static 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
135static 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
197 case VIDIOC_LOG_STATUS:
198 return v4l2_subdev_call(sd, core, log_status);
199
200#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
201 case VIDIOC_SUBDEV_G_FMT: {
202 struct v4l2_subdev_format *format = arg;
203
204 if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
205 format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
206 return -EINVAL;
207
208 if (format->pad >= sd->entity.num_pads)
209 return -EINVAL;
210
211 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh, format);
212 }
213
214 case VIDIOC_SUBDEV_S_FMT: {
215 struct v4l2_subdev_format *format = arg;
216
217 if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
218 format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
219 return -EINVAL;
220
221 if (format->pad >= sd->entity.num_pads)
222 return -EINVAL;
223
224 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh, format);
225 }
226
227 case VIDIOC_SUBDEV_G_CROP: {
228 struct v4l2_subdev_crop *crop = arg;
229
230 if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
231 crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
232 return -EINVAL;
233
234 if (crop->pad >= sd->entity.num_pads)
235 return -EINVAL;
236
237 return v4l2_subdev_call(sd, pad, get_crop, subdev_fh, crop);
238 }
239
240 case VIDIOC_SUBDEV_S_CROP: {
241 struct v4l2_subdev_crop *crop = arg;
242
243 if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
244 crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
245 return -EINVAL;
246
247 if (crop->pad >= sd->entity.num_pads)
248 return -EINVAL;
249
250 return v4l2_subdev_call(sd, pad, set_crop, subdev_fh, crop);
251 }
252
253 case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
254 struct v4l2_subdev_mbus_code_enum *code = arg;
255
256 if (code->pad >= sd->entity.num_pads)
257 return -EINVAL;
258
259 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh,
260 code);
261 }
262
263 case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
264 struct v4l2_subdev_frame_size_enum *fse = arg;
265
266 if (fse->pad >= sd->entity.num_pads)
267 return -EINVAL;
268
269 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh,
270 fse);
271 }
272
273 case VIDIOC_SUBDEV_G_FRAME_INTERVAL:
274 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
275
276 case VIDIOC_SUBDEV_S_FRAME_INTERVAL:
277 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
278
279 case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
280 struct v4l2_subdev_frame_interval_enum *fie = arg;
281
282 if (fie->pad >= sd->entity.num_pads)
283 return -EINVAL;
284
285 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh,
286 fie);
287 }
288#endif
289 default:
290 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
291 }
292
293 return 0;
294}
295
296static long subdev_ioctl(struct file *file, unsigned int cmd,
297 unsigned long arg)
298{
299 return video_usercopy(file, cmd, arg, subdev_do_ioctl);
300}
301
302static unsigned int subdev_poll(struct file *file, poll_table *wait)
303{
304 struct video_device *vdev = video_devdata(file);
305 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
306 struct v4l2_fh *fh = file->private_data;
307
308 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
309 return POLLERR;
310
311 poll_wait(file, &fh->wait, wait);
312
313 if (v4l2_event_pending(fh))
314 return POLLPRI;
315
316 return 0;
317}
318
319const struct v4l2_file_operations v4l2_subdev_fops = {
320 .owner = THIS_MODULE,
321 .open = subdev_open,
322 .unlocked_ioctl = subdev_ioctl,
323 .release = subdev_close,
324 .poll = subdev_poll,
325};
326
327void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
328{
329 INIT_LIST_HEAD(&sd->list);
330 BUG_ON(!ops);
331 sd->ops = ops;
332 sd->v4l2_dev = NULL;
333 sd->flags = 0;
334 sd->name[0] = '\0';
335 sd->grp_id = 0;
336 sd->dev_priv = NULL;
337 sd->host_priv = NULL;
338#if defined(CONFIG_MEDIA_CONTROLLER)
339 sd->entity.name = sd->name;
340 sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV;
341#endif
342}
343EXPORT_SYMBOL(v4l2_subdev_init);