v4l: Implement v4l2_subdev_link_validate()
[omap4-v4l2-camera:omap4-v4l2-camera.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         fh->pad = kzalloc(sizeof(*fh->pad) * sd->entity.num_pads, GFP_KERNEL);
39         if (fh->pad == NULL)
40                 return -ENOMEM;
41 #endif
42         return 0;
43 }
44
45 static void subdev_fh_free(struct v4l2_subdev_fh *fh)
46 {
47 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
48         kfree(fh->pad);
49         fh->pad = NULL;
50 #endif
51 }
52
53 static int subdev_open(struct file *file)
54 {
55         struct video_device *vdev = video_devdata(file);
56         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
57         struct v4l2_subdev_fh *subdev_fh;
58 #if defined(CONFIG_MEDIA_CONTROLLER)
59         struct media_entity *entity = NULL;
60 #endif
61         int ret;
62
63         subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
64         if (subdev_fh == NULL)
65                 return -ENOMEM;
66
67         ret = subdev_fh_init(subdev_fh, sd);
68         if (ret) {
69                 kfree(subdev_fh);
70                 return ret;
71         }
72
73         v4l2_fh_init(&subdev_fh->vfh, vdev);
74         v4l2_fh_add(&subdev_fh->vfh);
75         file->private_data = &subdev_fh->vfh;
76 #if defined(CONFIG_MEDIA_CONTROLLER)
77         if (sd->v4l2_dev->mdev) {
78                 entity = media_entity_get(&sd->entity);
79                 if (!entity) {
80                         ret = -EBUSY;
81                         goto err;
82                 }
83         }
84 #endif
85
86         if (sd->internal_ops && sd->internal_ops->open) {
87                 ret = sd->internal_ops->open(sd, subdev_fh);
88                 if (ret < 0)
89                         goto err;
90         }
91
92         return 0;
93
94 err:
95 #if defined(CONFIG_MEDIA_CONTROLLER)
96         if (entity)
97                 media_entity_put(entity);
98 #endif
99         v4l2_fh_del(&subdev_fh->vfh);
100         v4l2_fh_exit(&subdev_fh->vfh);
101         subdev_fh_free(subdev_fh);
102         kfree(subdev_fh);
103
104         return ret;
105 }
106
107 static int subdev_close(struct file *file)
108 {
109         struct video_device *vdev = video_devdata(file);
110         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
111         struct v4l2_fh *vfh = file->private_data;
112         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
113
114         if (sd->internal_ops && sd->internal_ops->close)
115                 sd->internal_ops->close(sd, subdev_fh);
116 #if defined(CONFIG_MEDIA_CONTROLLER)
117         if (sd->v4l2_dev->mdev)
118                 media_entity_put(&sd->entity);
119 #endif
120         v4l2_fh_del(vfh);
121         v4l2_fh_exit(vfh);
122         subdev_fh_free(subdev_fh);
123         kfree(subdev_fh);
124         file->private_data = NULL;
125
126         return 0;
127 }
128
129 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
130 {
131         struct video_device *vdev = video_devdata(file);
132         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
133         struct v4l2_fh *vfh = file->private_data;
134 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
135         struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
136 #endif
137
138         switch (cmd) {
139         case VIDIOC_QUERYCTRL:
140                 return v4l2_queryctrl(vfh->ctrl_handler, arg);
141
142         case VIDIOC_QUERYMENU:
143                 return v4l2_querymenu(vfh->ctrl_handler, arg);
144
145         case VIDIOC_G_CTRL:
146                 return v4l2_g_ctrl(vfh->ctrl_handler, arg);
147
148         case VIDIOC_S_CTRL:
149                 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
150
151         case VIDIOC_G_EXT_CTRLS:
152                 return v4l2_g_ext_ctrls(vfh->ctrl_handler, arg);
153
154         case VIDIOC_S_EXT_CTRLS:
155                 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, arg);
156
157         case VIDIOC_TRY_EXT_CTRLS:
158                 return v4l2_try_ext_ctrls(vfh->ctrl_handler, arg);
159
160         case VIDIOC_DQEVENT:
161                 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
162                         return -ENOIOCTLCMD;
163
164                 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
165
166         case VIDIOC_SUBSCRIBE_EVENT:
167                 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
168
169         case VIDIOC_UNSUBSCRIBE_EVENT:
170                 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
171
172 #ifdef CONFIG_VIDEO_ADV_DEBUG
173         case VIDIOC_DBG_G_REGISTER:
174         {
175                 struct v4l2_dbg_register *p = arg;
176
177                 if (!capable(CAP_SYS_ADMIN))
178                         return -EPERM;
179                 return v4l2_subdev_call(sd, core, g_register, p);
180         }
181         case VIDIOC_DBG_S_REGISTER:
182         {
183                 struct v4l2_dbg_register *p = arg;
184
185                 if (!capable(CAP_SYS_ADMIN))
186                         return -EPERM;
187                 return v4l2_subdev_call(sd, core, s_register, p);
188         }
189 #endif
190
191         case VIDIOC_LOG_STATUS: {
192                 int ret;
193
194                 pr_info("%s: =================  START STATUS  =================\n",
195                         sd->name);
196                 ret = v4l2_subdev_call(sd, core, log_status);
197                 pr_info("%s: ==================  END STATUS  ==================\n",
198                         sd->name);
199                 return ret;
200         }
201
202 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
203         case VIDIOC_SUBDEV_G_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, get_fmt, subdev_fh, format);
214         }
215
216         case VIDIOC_SUBDEV_S_FMT: {
217                 struct v4l2_subdev_format *format = arg;
218
219                 if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
220                     format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
221                         return -EINVAL;
222
223                 if (format->pad >= sd->entity.num_pads)
224                         return -EINVAL;
225
226                 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh, format);
227         }
228
229         case VIDIOC_SUBDEV_G_CROP: {
230                 struct v4l2_subdev_crop *crop = arg;
231                 struct v4l2_subdev_selection sel;
232                 int rval;
233
234                 if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
235                     crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
236                         return -EINVAL;
237
238                 if (crop->pad >= sd->entity.num_pads)
239                         return -EINVAL;
240
241                 rval = v4l2_subdev_call(sd, pad, get_crop, subdev_fh, crop);
242                 if (rval != -ENOIOCTLCMD)
243                         return rval;
244
245                 memset(&sel, 0, sizeof(sel));
246                 sel.which = crop->which;
247                 sel.pad = crop->pad;
248                 sel.target = V4L2_SUBDEV_SEL_TGT_CROP_ACTIVE;
249
250                 rval = v4l2_subdev_call(
251                         sd, pad, get_selection, subdev_fh, &sel);
252
253                 crop->rect = sel.r;
254
255                 return rval;
256         }
257
258         case VIDIOC_SUBDEV_S_CROP: {
259                 struct v4l2_subdev_crop *crop = arg;
260                 struct v4l2_subdev_selection sel;
261                 int rval;
262
263                 if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
264                     crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
265                         return -EINVAL;
266
267                 if (crop->pad >= sd->entity.num_pads)
268                         return -EINVAL;
269
270                 rval = v4l2_subdev_call(sd, pad, set_crop, subdev_fh, crop);
271                 if (rval != -ENOIOCTLCMD)
272                         return rval;
273
274                 memset(&sel, 0, sizeof(sel));
275                 sel.which = crop->which;
276                 sel.pad = crop->pad;
277                 sel.target = V4L2_SUBDEV_SEL_TGT_CROP_ACTIVE;
278                 sel.r = crop->rect;
279
280                 rval = v4l2_subdev_call(
281                         sd, pad, set_selection, subdev_fh, &sel);
282
283                 crop->rect = sel.r;
284
285                 return rval;
286         }
287
288         case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
289                 struct v4l2_subdev_mbus_code_enum *code = arg;
290
291                 if (code->pad >= sd->entity.num_pads)
292                         return -EINVAL;
293
294                 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh,
295                                         code);
296         }
297
298         case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
299                 struct v4l2_subdev_frame_size_enum *fse = arg;
300
301                 if (fse->pad >= sd->entity.num_pads)
302                         return -EINVAL;
303
304                 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh,
305                                         fse);
306         }
307
308         case VIDIOC_SUBDEV_G_FRAME_INTERVAL:
309                 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
310
311         case VIDIOC_SUBDEV_S_FRAME_INTERVAL:
312                 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
313
314         case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
315                 struct v4l2_subdev_frame_interval_enum *fie = arg;
316
317                 if (fie->pad >= sd->entity.num_pads)
318                         return -EINVAL;
319
320                 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh,
321                                         fie);
322         }
323
324         case VIDIOC_SUBDEV_G_SELECTION: {
325                 struct v4l2_subdev_selection *sel = arg;
326
327                 if (sel->which != V4L2_SUBDEV_FORMAT_TRY &&
328                     sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
329                         return -EINVAL;
330
331                 if (sel->pad >= sd->entity.num_pads)
332                         return -EINVAL;
333
334                 return v4l2_subdev_call(
335                         sd, pad, get_selection, subdev_fh, sel);
336         }
337
338         case VIDIOC_SUBDEV_S_SELECTION: {
339                 struct v4l2_subdev_selection *sel = arg;
340
341                 if (sel->which != V4L2_SUBDEV_FORMAT_TRY &&
342                     sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
343                         return -EINVAL;
344
345                 if (sel->pad >= sd->entity.num_pads)
346                         return -EINVAL;
347
348                 return v4l2_subdev_call(
349                         sd, pad, set_selection, subdev_fh, sel);
350         }
351 #endif
352         default:
353                 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
354         }
355
356         return 0;
357 }
358
359 static long subdev_ioctl(struct file *file, unsigned int cmd,
360         unsigned long arg)
361 {
362         return video_usercopy(file, cmd, arg, subdev_do_ioctl);
363 }
364
365 static unsigned int subdev_poll(struct file *file, poll_table *wait)
366 {
367         struct video_device *vdev = video_devdata(file);
368         struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
369         struct v4l2_fh *fh = file->private_data;
370
371         if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
372                 return POLLERR;
373
374         poll_wait(file, &fh->wait, wait);
375
376         if (v4l2_event_pending(fh))
377                 return POLLPRI;
378
379         return 0;
380 }
381
382 const struct v4l2_file_operations v4l2_subdev_fops = {
383         .owner = THIS_MODULE,
384         .open = subdev_open,
385         .unlocked_ioctl = subdev_ioctl,
386         .release = subdev_close,
387         .poll = subdev_poll,
388 };
389
390 #ifdef CONFIG_MEDIA_CONTROLLER
391 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
392                                       struct media_link *link,
393                                       struct v4l2_subdev_format *source_fmt,
394                                       struct v4l2_subdev_format *sink_fmt)
395 {
396         if (source_fmt->format.width != sink_fmt->format.width
397             || source_fmt->format.height != sink_fmt->format.height
398             || source_fmt->format.code != sink_fmt->format.code)
399                 return -EINVAL;
400
401         return 0;
402 }
403 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);
404
405 static int
406 v4l2_subdev_link_validate_get_format(struct media_pad *pad,
407                                      struct v4l2_subdev_format *fmt)
408 {
409         switch (media_entity_type(pad->entity)) {
410         case MEDIA_ENT_T_V4L2_SUBDEV:
411                 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
412                 fmt->pad = pad->index;
413                 return v4l2_subdev_call(media_entity_to_v4l2_subdev(
414                                                 pad->entity),
415                                         pad, get_fmt, NULL, fmt);
416         default:
417                 WARN(1, "Driver bug! Wrong media entity type %d, entity %s\n",
418                      media_entity_type(pad->entity), pad->entity->name);
419                 /* Fall through */
420         case MEDIA_ENT_T_DEVNODE_V4L:
421                 return -EINVAL;
422         }
423 }
424
425 int v4l2_subdev_link_validate(struct media_link *link)
426 {
427         struct v4l2_subdev *sink;
428         struct v4l2_subdev_format sink_fmt, source_fmt;
429         int rval;
430
431         rval = v4l2_subdev_link_validate_get_format(
432                 link->source, &source_fmt);
433         if (rval < 0)
434                 return 0;
435
436         rval = v4l2_subdev_link_validate_get_format(
437                 link->sink, &sink_fmt);
438         if (rval < 0)
439                 return 0;
440
441         sink = media_entity_to_v4l2_subdev(link->sink->entity);
442
443         rval = v4l2_subdev_call(sink, pad, link_validate, link,
444                                 &source_fmt, &sink_fmt);
445         if (rval != -ENOIOCTLCMD)
446                 return rval;
447
448         return v4l2_subdev_link_validate_default(
449                 sink, link, &source_fmt, &sink_fmt);
450 }
451 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
452 #endif /* CONFIG_MEDIA_CONTROLLER */
453
454 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
455 {
456         INIT_LIST_HEAD(&sd->list);
457         BUG_ON(!ops);
458         sd->ops = ops;
459         sd->v4l2_dev = NULL;
460         sd->flags = 0;
461         sd->name[0] = '\0';
462         sd->grp_id = 0;
463         sd->dev_priv = NULL;
464         sd->host_priv = NULL;
465 #if defined(CONFIG_MEDIA_CONTROLLER)
466         sd->entity.name = sd->name;
467         sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV;
468 #endif
469 }
470 EXPORT_SYMBOL(v4l2_subdev_init);