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
subdev_fh_init(struct v4l2_subdev_fh * fh,struct v4l2_subdev * sd)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
subdev_fh_free(struct v4l2_subdev_fh * fh)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
subdev_open(struct file * file)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
subdev_close(struct file * file)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 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
check_format(struct v4l2_subdev * sd,struct v4l2_subdev_format * format)130 static int check_format(struct v4l2_subdev *sd,
131 struct v4l2_subdev_format *format)
132 {
133 if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
134 format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
135 return -EINVAL;
136
137 if (format->pad >= sd->entity.num_pads)
138 return -EINVAL;
139
140 return 0;
141 }
142
check_crop(struct v4l2_subdev * sd,struct v4l2_subdev_crop * crop)143 static int check_crop(struct v4l2_subdev *sd, struct v4l2_subdev_crop *crop)
144 {
145 if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
146 crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
147 return -EINVAL;
148
149 if (crop->pad >= sd->entity.num_pads)
150 return -EINVAL;
151
152 return 0;
153 }
154
check_selection(struct v4l2_subdev * sd,struct v4l2_subdev_selection * sel)155 static int check_selection(struct v4l2_subdev *sd,
156 struct v4l2_subdev_selection *sel)
157 {
158 if (sel->which != V4L2_SUBDEV_FORMAT_TRY &&
159 sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
160 return -EINVAL;
161
162 if (sel->pad >= sd->entity.num_pads)
163 return -EINVAL;
164
165 return 0;
166 }
167
check_edid(struct v4l2_subdev * sd,struct v4l2_subdev_edid * edid)168 static int check_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
169 {
170 if (edid->pad >= sd->entity.num_pads)
171 return -EINVAL;
172
173 if (edid->blocks && edid->edid == NULL)
174 return -EINVAL;
175
176 return 0;
177 }
178 #endif
179
subdev_do_ioctl(struct file * file,unsigned int cmd,void * arg)180 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
181 {
182 struct video_device *vdev = video_devdata(file);
183 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
184 struct v4l2_fh *vfh = file->private_data;
185 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
186 struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
187 int rval;
188 #endif
189
190 switch (cmd) {
191 case VIDIOC_QUERYCTRL:
192 return v4l2_queryctrl(vfh->ctrl_handler, arg);
193
194 case VIDIOC_QUERY_EXT_CTRL:
195 return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg);
196
197 case VIDIOC_QUERYMENU:
198 return v4l2_querymenu(vfh->ctrl_handler, arg);
199
200 case VIDIOC_G_CTRL:
201 return v4l2_g_ctrl(vfh->ctrl_handler, arg);
202
203 case VIDIOC_S_CTRL:
204 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
205
206 case VIDIOC_G_EXT_CTRLS:
207 return v4l2_g_ext_ctrls(vfh->ctrl_handler, arg);
208
209 case VIDIOC_S_EXT_CTRLS:
210 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, arg);
211
212 case VIDIOC_TRY_EXT_CTRLS:
213 return v4l2_try_ext_ctrls(vfh->ctrl_handler, arg);
214
215 case VIDIOC_DQEVENT:
216 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
217 return -ENOIOCTLCMD;
218
219 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
220
221 case VIDIOC_SUBSCRIBE_EVENT:
222 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
223
224 case VIDIOC_UNSUBSCRIBE_EVENT:
225 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
226
227 #ifdef CONFIG_VIDEO_ADV_DEBUG
228 case VIDIOC_DBG_G_REGISTER:
229 {
230 struct v4l2_dbg_register *p = arg;
231
232 if (!capable(CAP_SYS_ADMIN))
233 return -EPERM;
234 return v4l2_subdev_call(sd, core, g_register, p);
235 }
236 case VIDIOC_DBG_S_REGISTER:
237 {
238 struct v4l2_dbg_register *p = arg;
239
240 if (!capable(CAP_SYS_ADMIN))
241 return -EPERM;
242 return v4l2_subdev_call(sd, core, s_register, p);
243 }
244 #endif
245
246 case VIDIOC_LOG_STATUS: {
247 int ret;
248
249 pr_info("%s: ================= START STATUS =================\n",
250 sd->name);
251 ret = v4l2_subdev_call(sd, core, log_status);
252 pr_info("%s: ================== END STATUS ==================\n",
253 sd->name);
254 return ret;
255 }
256
257 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
258 case VIDIOC_SUBDEV_G_FMT: {
259 struct v4l2_subdev_format *format = arg;
260
261 rval = check_format(sd, format);
262 if (rval)
263 return rval;
264
265 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh, format);
266 }
267
268 case VIDIOC_SUBDEV_S_FMT: {
269 struct v4l2_subdev_format *format = arg;
270
271 rval = check_format(sd, format);
272 if (rval)
273 return rval;
274
275 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh, format);
276 }
277
278 case VIDIOC_SUBDEV_G_CROP: {
279 struct v4l2_subdev_crop *crop = arg;
280 struct v4l2_subdev_selection sel;
281
282 rval = check_crop(sd, crop);
283 if (rval)
284 return rval;
285
286 rval = v4l2_subdev_call(sd, pad, get_crop, subdev_fh, crop);
287 if (rval != -ENOIOCTLCMD)
288 return rval;
289
290 memset(&sel, 0, sizeof(sel));
291 sel.which = crop->which;
292 sel.pad = crop->pad;
293 sel.target = V4L2_SEL_TGT_CROP;
294
295 rval = v4l2_subdev_call(
296 sd, pad, get_selection, subdev_fh, &sel);
297
298 crop->rect = sel.r;
299
300 return rval;
301 }
302
303 case VIDIOC_SUBDEV_S_CROP: {
304 struct v4l2_subdev_crop *crop = arg;
305 struct v4l2_subdev_selection sel;
306
307 rval = check_crop(sd, crop);
308 if (rval)
309 return rval;
310
311 rval = v4l2_subdev_call(sd, pad, set_crop, subdev_fh, crop);
312 if (rval != -ENOIOCTLCMD)
313 return rval;
314
315 memset(&sel, 0, sizeof(sel));
316 sel.which = crop->which;
317 sel.pad = crop->pad;
318 sel.target = V4L2_SEL_TGT_CROP;
319 sel.r = crop->rect;
320
321 rval = v4l2_subdev_call(
322 sd, pad, set_selection, subdev_fh, &sel);
323
324 crop->rect = sel.r;
325
326 return rval;
327 }
328
329 case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
330 struct v4l2_subdev_mbus_code_enum *code = arg;
331
332 if (code->pad >= sd->entity.num_pads)
333 return -EINVAL;
334
335 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh,
336 code);
337 }
338
339 case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
340 struct v4l2_subdev_frame_size_enum *fse = arg;
341
342 if (fse->pad >= sd->entity.num_pads)
343 return -EINVAL;
344
345 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh,
346 fse);
347 }
348
349 case VIDIOC_SUBDEV_G_FRAME_INTERVAL: {
350 struct v4l2_subdev_frame_interval *fi = arg;
351
352 if (fi->pad >= sd->entity.num_pads)
353 return -EINVAL;
354
355 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
356 }
357
358 case VIDIOC_SUBDEV_S_FRAME_INTERVAL: {
359 struct v4l2_subdev_frame_interval *fi = arg;
360
361 if (fi->pad >= sd->entity.num_pads)
362 return -EINVAL;
363
364 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
365 }
366
367 case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
368 struct v4l2_subdev_frame_interval_enum *fie = arg;
369
370 if (fie->pad >= sd->entity.num_pads)
371 return -EINVAL;
372
373 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh,
374 fie);
375 }
376
377 case VIDIOC_SUBDEV_G_SELECTION: {
378 struct v4l2_subdev_selection *sel = arg;
379
380 rval = check_selection(sd, sel);
381 if (rval)
382 return rval;
383
384 return v4l2_subdev_call(
385 sd, pad, get_selection, subdev_fh, sel);
386 }
387
388 case VIDIOC_SUBDEV_S_SELECTION: {
389 struct v4l2_subdev_selection *sel = arg;
390
391 rval = check_selection(sd, sel);
392 if (rval)
393 return rval;
394
395 return v4l2_subdev_call(
396 sd, pad, set_selection, subdev_fh, sel);
397 }
398
399 case VIDIOC_G_EDID: {
400 struct v4l2_subdev_edid *edid = arg;
401
402 rval = check_edid(sd, edid);
403 if (rval)
404 return rval;
405
406 return v4l2_subdev_call(sd, pad, get_edid, edid);
407 }
408
409 case VIDIOC_S_EDID: {
410 struct v4l2_subdev_edid *edid = arg;
411
412 rval = check_edid(sd, edid);
413 if (rval)
414 return rval;
415
416 return v4l2_subdev_call(sd, pad, set_edid, edid);
417 }
418
419 case VIDIOC_SUBDEV_DV_TIMINGS_CAP: {
420 struct v4l2_dv_timings_cap *cap = arg;
421
422 if (cap->pad >= sd->entity.num_pads)
423 return -EINVAL;
424
425 return v4l2_subdev_call(sd, pad, dv_timings_cap, cap);
426 }
427
428 case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: {
429 struct v4l2_enum_dv_timings *dvt = arg;
430
431 if (dvt->pad >= sd->entity.num_pads)
432 return -EINVAL;
433
434 return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt);
435 }
436
437 case VIDIOC_SUBDEV_QUERY_DV_TIMINGS:
438 return v4l2_subdev_call(sd, video, query_dv_timings, arg);
439
440 case VIDIOC_SUBDEV_G_DV_TIMINGS:
441 return v4l2_subdev_call(sd, video, g_dv_timings, arg);
442
443 case VIDIOC_SUBDEV_S_DV_TIMINGS:
444 return v4l2_subdev_call(sd, video, s_dv_timings, arg);
445 #endif
446 default:
447 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
448 }
449
450 return 0;
451 }
452
subdev_ioctl(struct file * file,unsigned int cmd,unsigned long arg)453 static long subdev_ioctl(struct file *file, unsigned int cmd,
454 unsigned long arg)
455 {
456 return video_usercopy(file, cmd, arg, subdev_do_ioctl);
457 }
458
459 #ifdef CONFIG_COMPAT
subdev_compat_ioctl32(struct file * file,unsigned int cmd,unsigned long arg)460 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
461 unsigned long arg)
462 {
463 struct video_device *vdev = video_devdata(file);
464 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
465
466 return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg);
467 }
468 #endif
469
subdev_poll(struct file * file,poll_table * wait)470 static unsigned int subdev_poll(struct file *file, poll_table *wait)
471 {
472 struct video_device *vdev = video_devdata(file);
473 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
474 struct v4l2_fh *fh = file->private_data;
475
476 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
477 return POLLERR;
478
479 poll_wait(file, &fh->wait, wait);
480
481 if (v4l2_event_pending(fh))
482 return POLLPRI;
483
484 return 0;
485 }
486
487 const struct v4l2_file_operations v4l2_subdev_fops = {
488 .owner = THIS_MODULE,
489 .open = subdev_open,
490 .unlocked_ioctl = subdev_ioctl,
491 #ifdef CONFIG_COMPAT
492 .compat_ioctl32 = subdev_compat_ioctl32,
493 #endif
494 .release = subdev_close,
495 .poll = subdev_poll,
496 };
497
498 #ifdef CONFIG_MEDIA_CONTROLLER
v4l2_subdev_link_validate_default(struct v4l2_subdev * sd,struct media_link * link,struct v4l2_subdev_format * source_fmt,struct v4l2_subdev_format * sink_fmt)499 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
500 struct media_link *link,
501 struct v4l2_subdev_format *source_fmt,
502 struct v4l2_subdev_format *sink_fmt)
503 {
504 /* The width, height and code must match. */
505 if (source_fmt->format.width != sink_fmt->format.width
506 || source_fmt->format.height != sink_fmt->format.height
507 || source_fmt->format.code != sink_fmt->format.code)
508 return -EINVAL;
509
510 /* The field order must match, or the sink field order must be NONE
511 * to support interlaced hardware connected to bridges that support
512 * progressive formats only.
513 */
514 if (source_fmt->format.field != sink_fmt->format.field &&
515 sink_fmt->format.field != V4L2_FIELD_NONE)
516 return -EINVAL;
517
518 return 0;
519 }
520 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);
521
522 static int
v4l2_subdev_link_validate_get_format(struct media_pad * pad,struct v4l2_subdev_format * fmt)523 v4l2_subdev_link_validate_get_format(struct media_pad *pad,
524 struct v4l2_subdev_format *fmt)
525 {
526 if (media_entity_type(pad->entity) == MEDIA_ENT_T_V4L2_SUBDEV) {
527 struct v4l2_subdev *sd =
528 media_entity_to_v4l2_subdev(pad->entity);
529
530 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
531 fmt->pad = pad->index;
532 return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
533 }
534
535 WARN(pad->entity->type != MEDIA_ENT_T_DEVNODE_V4L,
536 "Driver bug! Wrong media entity type 0x%08x, entity %s\n",
537 pad->entity->type, pad->entity->name);
538
539 return -EINVAL;
540 }
541
v4l2_subdev_link_validate(struct media_link * link)542 int v4l2_subdev_link_validate(struct media_link *link)
543 {
544 struct v4l2_subdev *sink;
545 struct v4l2_subdev_format sink_fmt, source_fmt;
546 int rval;
547
548 rval = v4l2_subdev_link_validate_get_format(
549 link->source, &source_fmt);
550 if (rval < 0)
551 return 0;
552
553 rval = v4l2_subdev_link_validate_get_format(
554 link->sink, &sink_fmt);
555 if (rval < 0)
556 return 0;
557
558 sink = media_entity_to_v4l2_subdev(link->sink->entity);
559
560 rval = v4l2_subdev_call(sink, pad, link_validate, link,
561 &source_fmt, &sink_fmt);
562 if (rval != -ENOIOCTLCMD)
563 return rval;
564
565 return v4l2_subdev_link_validate_default(
566 sink, link, &source_fmt, &sink_fmt);
567 }
568 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
569 #endif /* CONFIG_MEDIA_CONTROLLER */
570
v4l2_subdev_init(struct v4l2_subdev * sd,const struct v4l2_subdev_ops * ops)571 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
572 {
573 INIT_LIST_HEAD(&sd->list);
574 BUG_ON(!ops);
575 sd->ops = ops;
576 sd->v4l2_dev = NULL;
577 sd->flags = 0;
578 sd->name[0] = '\0';
579 sd->grp_id = 0;
580 sd->dev_priv = NULL;
581 sd->host_priv = NULL;
582 #if defined(CONFIG_MEDIA_CONTROLLER)
583 sd->entity.name = sd->name;
584 sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV;
585 #endif
586 }
587 EXPORT_SYMBOL(v4l2_subdev_init);
588