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19#include <linux/ioctl.h>
20#include <linux/mm.h>
21#include <linux/slab.h>
22#include <linux/types.h>
23#include <linux/videodev2.h>
24#include <linux/export.h>
25
26#include <media/v4l2-ctrls.h>
27#include <media/v4l2-device.h>
28#include <media/v4l2-ioctl.h>
29#include <media/v4l2-fh.h>
30#include <media/v4l2-event.h>
31
32static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
33{
34#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
35 if (sd->entity.num_pads) {
36 fh->pad = v4l2_subdev_alloc_pad_config(sd);
37 if (fh->pad == NULL)
38 return -ENOMEM;
39 }
40#endif
41 return 0;
42}
43
44static void subdev_fh_free(struct v4l2_subdev_fh *fh)
45{
46#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
47 v4l2_subdev_free_pad_config(fh->pad);
48 fh->pad = NULL;
49#endif
50}
51
52static int subdev_open(struct file *file)
53{
54 struct video_device *vdev = video_devdata(file);
55 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
56 struct v4l2_subdev_fh *subdev_fh;
57#if defined(CONFIG_MEDIA_CONTROLLER)
58 struct media_entity *entity = NULL;
59#endif
60 int ret;
61
62 subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
63 if (subdev_fh == NULL)
64 return -ENOMEM;
65
66 ret = subdev_fh_init(subdev_fh, sd);
67 if (ret) {
68 kfree(subdev_fh);
69 return ret;
70 }
71
72 v4l2_fh_init(&subdev_fh->vfh, vdev);
73 v4l2_fh_add(&subdev_fh->vfh);
74 file->private_data = &subdev_fh->vfh;
75#if defined(CONFIG_MEDIA_CONTROLLER)
76 if (sd->v4l2_dev->mdev) {
77 entity = media_entity_get(&sd->entity);
78 if (!entity) {
79 ret = -EBUSY;
80 goto err;
81 }
82 }
83#endif
84
85 if (sd->internal_ops && sd->internal_ops->open) {
86 ret = sd->internal_ops->open(sd, subdev_fh);
87 if (ret < 0)
88 goto err;
89 }
90
91 return 0;
92
93err:
94#if defined(CONFIG_MEDIA_CONTROLLER)
95 media_entity_put(entity);
96#endif
97 v4l2_fh_del(&subdev_fh->vfh);
98 v4l2_fh_exit(&subdev_fh->vfh);
99 subdev_fh_free(subdev_fh);
100 kfree(subdev_fh);
101
102 return ret;
103}
104
105static int subdev_close(struct file *file)
106{
107 struct video_device *vdev = video_devdata(file);
108 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
109 struct v4l2_fh *vfh = file->private_data;
110 struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
111
112 if (sd->internal_ops && sd->internal_ops->close)
113 sd->internal_ops->close(sd, subdev_fh);
114#if defined(CONFIG_MEDIA_CONTROLLER)
115 if (sd->v4l2_dev->mdev)
116 media_entity_put(&sd->entity);
117#endif
118 v4l2_fh_del(vfh);
119 v4l2_fh_exit(vfh);
120 subdev_fh_free(subdev_fh);
121 kfree(subdev_fh);
122 file->private_data = NULL;
123
124 return 0;
125}
126
127#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
128static int check_format(struct v4l2_subdev *sd,
129 struct v4l2_subdev_format *format)
130{
131 if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
132 format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
133 return -EINVAL;
134
135 if (format->pad >= sd->entity.num_pads)
136 return -EINVAL;
137
138 return 0;
139}
140
141static int check_crop(struct v4l2_subdev *sd, struct v4l2_subdev_crop *crop)
142{
143 if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
144 crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
145 return -EINVAL;
146
147 if (crop->pad >= sd->entity.num_pads)
148 return -EINVAL;
149
150 return 0;
151}
152
153static int check_selection(struct v4l2_subdev *sd,
154 struct v4l2_subdev_selection *sel)
155{
156 if (sel->which != V4L2_SUBDEV_FORMAT_TRY &&
157 sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
158 return -EINVAL;
159
160 if (sel->pad >= sd->entity.num_pads)
161 return -EINVAL;
162
163 return 0;
164}
165
166static int check_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
167{
168 if (edid->pad >= sd->entity.num_pads)
169 return -EINVAL;
170
171 if (edid->blocks && edid->edid == NULL)
172 return -EINVAL;
173
174 return 0;
175}
176#endif
177
178static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
179{
180 struct video_device *vdev = video_devdata(file);
181 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
182 struct v4l2_fh *vfh = file->private_data;
183#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
184 struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
185 int rval;
186#endif
187
188 switch (cmd) {
189 case VIDIOC_QUERYCTRL:
190
191
192
193
194
195
196
197
198 if (!vfh->ctrl_handler)
199 return -ENOTTY;
200 return v4l2_queryctrl(vfh->ctrl_handler, arg);
201
202 case VIDIOC_QUERY_EXT_CTRL:
203 if (!vfh->ctrl_handler)
204 return -ENOTTY;
205 return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg);
206
207 case VIDIOC_QUERYMENU:
208 if (!vfh->ctrl_handler)
209 return -ENOTTY;
210 return v4l2_querymenu(vfh->ctrl_handler, arg);
211
212 case VIDIOC_G_CTRL:
213 if (!vfh->ctrl_handler)
214 return -ENOTTY;
215 return v4l2_g_ctrl(vfh->ctrl_handler, arg);
216
217 case VIDIOC_S_CTRL:
218 if (!vfh->ctrl_handler)
219 return -ENOTTY;
220 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
221
222 case VIDIOC_G_EXT_CTRLS:
223 if (!vfh->ctrl_handler)
224 return -ENOTTY;
225 return v4l2_g_ext_ctrls(vfh->ctrl_handler, arg);
226
227 case VIDIOC_S_EXT_CTRLS:
228 if (!vfh->ctrl_handler)
229 return -ENOTTY;
230 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, arg);
231
232 case VIDIOC_TRY_EXT_CTRLS:
233 if (!vfh->ctrl_handler)
234 return -ENOTTY;
235 return v4l2_try_ext_ctrls(vfh->ctrl_handler, arg);
236
237 case VIDIOC_DQEVENT:
238 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
239 return -ENOIOCTLCMD;
240
241 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
242
243 case VIDIOC_SUBSCRIBE_EVENT:
244 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
245
246 case VIDIOC_UNSUBSCRIBE_EVENT:
247 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
248
249#ifdef CONFIG_VIDEO_ADV_DEBUG
250 case VIDIOC_DBG_G_REGISTER:
251 {
252 struct v4l2_dbg_register *p = arg;
253
254 if (!capable(CAP_SYS_ADMIN))
255 return -EPERM;
256 return v4l2_subdev_call(sd, core, g_register, p);
257 }
258 case VIDIOC_DBG_S_REGISTER:
259 {
260 struct v4l2_dbg_register *p = arg;
261
262 if (!capable(CAP_SYS_ADMIN))
263 return -EPERM;
264 return v4l2_subdev_call(sd, core, s_register, p);
265 }
266 case VIDIOC_DBG_G_CHIP_INFO:
267 {
268 struct v4l2_dbg_chip_info *p = arg;
269
270 if (p->match.type != V4L2_CHIP_MATCH_SUBDEV || p->match.addr)
271 return -EINVAL;
272 if (sd->ops->core && sd->ops->core->s_register)
273 p->flags |= V4L2_CHIP_FL_WRITABLE;
274 if (sd->ops->core && sd->ops->core->g_register)
275 p->flags |= V4L2_CHIP_FL_READABLE;
276 strlcpy(p->name, sd->name, sizeof(p->name));
277 return 0;
278 }
279#endif
280
281 case VIDIOC_LOG_STATUS: {
282 int ret;
283
284 pr_info("%s: ================= START STATUS =================\n",
285 sd->name);
286 ret = v4l2_subdev_call(sd, core, log_status);
287 pr_info("%s: ================== END STATUS ==================\n",
288 sd->name);
289 return ret;
290 }
291
292#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
293 case VIDIOC_SUBDEV_G_FMT: {
294 struct v4l2_subdev_format *format = arg;
295
296 rval = check_format(sd, format);
297 if (rval)
298 return rval;
299
300 memset(format->reserved, 0, sizeof(format->reserved));
301 memset(format->format.reserved, 0, sizeof(format->format.reserved));
302 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh->pad, format);
303 }
304
305 case VIDIOC_SUBDEV_S_FMT: {
306 struct v4l2_subdev_format *format = arg;
307
308 rval = check_format(sd, format);
309 if (rval)
310 return rval;
311
312 memset(format->reserved, 0, sizeof(format->reserved));
313 memset(format->format.reserved, 0, sizeof(format->format.reserved));
314 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh->pad, format);
315 }
316
317 case VIDIOC_SUBDEV_G_CROP: {
318 struct v4l2_subdev_crop *crop = arg;
319 struct v4l2_subdev_selection sel;
320
321 rval = check_crop(sd, crop);
322 if (rval)
323 return rval;
324
325 memset(crop->reserved, 0, sizeof(crop->reserved));
326 memset(&sel, 0, sizeof(sel));
327 sel.which = crop->which;
328 sel.pad = crop->pad;
329 sel.target = V4L2_SEL_TGT_CROP;
330
331 rval = v4l2_subdev_call(
332 sd, pad, get_selection, subdev_fh->pad, &sel);
333
334 crop->rect = sel.r;
335
336 return rval;
337 }
338
339 case VIDIOC_SUBDEV_S_CROP: {
340 struct v4l2_subdev_crop *crop = arg;
341 struct v4l2_subdev_selection sel;
342
343 memset(crop->reserved, 0, sizeof(crop->reserved));
344 rval = check_crop(sd, crop);
345 if (rval)
346 return rval;
347
348 memset(&sel, 0, sizeof(sel));
349 sel.which = crop->which;
350 sel.pad = crop->pad;
351 sel.target = V4L2_SEL_TGT_CROP;
352 sel.r = crop->rect;
353
354 rval = v4l2_subdev_call(
355 sd, pad, set_selection, subdev_fh->pad, &sel);
356
357 crop->rect = sel.r;
358
359 return rval;
360 }
361
362 case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
363 struct v4l2_subdev_mbus_code_enum *code = arg;
364
365 if (code->which != V4L2_SUBDEV_FORMAT_TRY &&
366 code->which != V4L2_SUBDEV_FORMAT_ACTIVE)
367 return -EINVAL;
368
369 if (code->pad >= sd->entity.num_pads)
370 return -EINVAL;
371
372 memset(code->reserved, 0, sizeof(code->reserved));
373 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh->pad,
374 code);
375 }
376
377 case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
378 struct v4l2_subdev_frame_size_enum *fse = arg;
379
380 if (fse->which != V4L2_SUBDEV_FORMAT_TRY &&
381 fse->which != V4L2_SUBDEV_FORMAT_ACTIVE)
382 return -EINVAL;
383
384 if (fse->pad >= sd->entity.num_pads)
385 return -EINVAL;
386
387 memset(fse->reserved, 0, sizeof(fse->reserved));
388 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh->pad,
389 fse);
390 }
391
392 case VIDIOC_SUBDEV_G_FRAME_INTERVAL: {
393 struct v4l2_subdev_frame_interval *fi = arg;
394
395 if (fi->pad >= sd->entity.num_pads)
396 return -EINVAL;
397
398 memset(fi->reserved, 0, sizeof(fi->reserved));
399 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
400 }
401
402 case VIDIOC_SUBDEV_S_FRAME_INTERVAL: {
403 struct v4l2_subdev_frame_interval *fi = arg;
404
405 if (fi->pad >= sd->entity.num_pads)
406 return -EINVAL;
407
408 memset(fi->reserved, 0, sizeof(fi->reserved));
409 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
410 }
411
412 case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
413 struct v4l2_subdev_frame_interval_enum *fie = arg;
414
415 if (fie->which != V4L2_SUBDEV_FORMAT_TRY &&
416 fie->which != V4L2_SUBDEV_FORMAT_ACTIVE)
417 return -EINVAL;
418
419 if (fie->pad >= sd->entity.num_pads)
420 return -EINVAL;
421
422 memset(fie->reserved, 0, sizeof(fie->reserved));
423 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh->pad,
424 fie);
425 }
426
427 case VIDIOC_SUBDEV_G_SELECTION: {
428 struct v4l2_subdev_selection *sel = arg;
429
430 rval = check_selection(sd, sel);
431 if (rval)
432 return rval;
433
434 memset(sel->reserved, 0, sizeof(sel->reserved));
435 return v4l2_subdev_call(
436 sd, pad, get_selection, subdev_fh->pad, sel);
437 }
438
439 case VIDIOC_SUBDEV_S_SELECTION: {
440 struct v4l2_subdev_selection *sel = arg;
441
442 rval = check_selection(sd, sel);
443 if (rval)
444 return rval;
445
446 memset(sel->reserved, 0, sizeof(sel->reserved));
447 return v4l2_subdev_call(
448 sd, pad, set_selection, subdev_fh->pad, sel);
449 }
450
451 case VIDIOC_G_EDID: {
452 struct v4l2_subdev_edid *edid = arg;
453
454 rval = check_edid(sd, edid);
455 if (rval)
456 return rval;
457
458 return v4l2_subdev_call(sd, pad, get_edid, edid);
459 }
460
461 case VIDIOC_S_EDID: {
462 struct v4l2_subdev_edid *edid = arg;
463
464 rval = check_edid(sd, edid);
465 if (rval)
466 return rval;
467
468 return v4l2_subdev_call(sd, pad, set_edid, edid);
469 }
470
471 case VIDIOC_SUBDEV_DV_TIMINGS_CAP: {
472 struct v4l2_dv_timings_cap *cap = arg;
473
474 if (cap->pad >= sd->entity.num_pads)
475 return -EINVAL;
476
477 return v4l2_subdev_call(sd, pad, dv_timings_cap, cap);
478 }
479
480 case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: {
481 struct v4l2_enum_dv_timings *dvt = arg;
482
483 if (dvt->pad >= sd->entity.num_pads)
484 return -EINVAL;
485
486 return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt);
487 }
488
489 case VIDIOC_SUBDEV_QUERY_DV_TIMINGS:
490 return v4l2_subdev_call(sd, video, query_dv_timings, arg);
491
492 case VIDIOC_SUBDEV_G_DV_TIMINGS:
493 return v4l2_subdev_call(sd, video, g_dv_timings, arg);
494
495 case VIDIOC_SUBDEV_S_DV_TIMINGS:
496 return v4l2_subdev_call(sd, video, s_dv_timings, arg);
497#endif
498 default:
499 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
500 }
501
502 return 0;
503}
504
505static long subdev_do_ioctl_lock(struct file *file, unsigned int cmd, void *arg)
506{
507 struct video_device *vdev = video_devdata(file);
508 struct mutex *lock = vdev->lock;
509 long ret = -ENODEV;
510
511 if (lock && mutex_lock_interruptible(lock))
512 return -ERESTARTSYS;
513 if (video_is_registered(vdev))
514 ret = subdev_do_ioctl(file, cmd, arg);
515 if (lock)
516 mutex_unlock(lock);
517 return ret;
518}
519
520static long subdev_ioctl(struct file *file, unsigned int cmd,
521 unsigned long arg)
522{
523 return video_usercopy(file, cmd, arg, subdev_do_ioctl_lock);
524}
525
526#ifdef CONFIG_COMPAT
527static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
528 unsigned long arg)
529{
530 struct video_device *vdev = video_devdata(file);
531 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
532
533 return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg);
534}
535#endif
536
537static __poll_t subdev_poll(struct file *file, poll_table *wait)
538{
539 struct video_device *vdev = video_devdata(file);
540 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
541 struct v4l2_fh *fh = file->private_data;
542
543 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
544 return EPOLLERR;
545
546 poll_wait(file, &fh->wait, wait);
547
548 if (v4l2_event_pending(fh))
549 return EPOLLPRI;
550
551 return 0;
552}
553
554const struct v4l2_file_operations v4l2_subdev_fops = {
555 .owner = THIS_MODULE,
556 .open = subdev_open,
557 .unlocked_ioctl = subdev_ioctl,
558#ifdef CONFIG_COMPAT
559 .compat_ioctl32 = subdev_compat_ioctl32,
560#endif
561 .release = subdev_close,
562 .poll = subdev_poll,
563};
564
565#ifdef CONFIG_MEDIA_CONTROLLER
566int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
567 struct media_link *link,
568 struct v4l2_subdev_format *source_fmt,
569 struct v4l2_subdev_format *sink_fmt)
570{
571
572 if (source_fmt->format.width != sink_fmt->format.width
573 || source_fmt->format.height != sink_fmt->format.height
574 || source_fmt->format.code != sink_fmt->format.code)
575 return -EPIPE;
576
577
578
579
580
581 if (source_fmt->format.field != sink_fmt->format.field &&
582 sink_fmt->format.field != V4L2_FIELD_NONE)
583 return -EPIPE;
584
585 return 0;
586}
587EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);
588
589static int
590v4l2_subdev_link_validate_get_format(struct media_pad *pad,
591 struct v4l2_subdev_format *fmt)
592{
593 if (is_media_entity_v4l2_subdev(pad->entity)) {
594 struct v4l2_subdev *sd =
595 media_entity_to_v4l2_subdev(pad->entity);
596
597 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
598 fmt->pad = pad->index;
599 return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
600 }
601
602 WARN(pad->entity->function != MEDIA_ENT_F_IO_V4L,
603 "Driver bug! Wrong media entity type 0x%08x, entity %s\n",
604 pad->entity->function, pad->entity->name);
605
606 return -EINVAL;
607}
608
609int v4l2_subdev_link_validate(struct media_link *link)
610{
611 struct v4l2_subdev *sink;
612 struct v4l2_subdev_format sink_fmt, source_fmt;
613 int rval;
614
615 rval = v4l2_subdev_link_validate_get_format(
616 link->source, &source_fmt);
617 if (rval < 0)
618 return 0;
619
620 rval = v4l2_subdev_link_validate_get_format(
621 link->sink, &sink_fmt);
622 if (rval < 0)
623 return 0;
624
625 sink = media_entity_to_v4l2_subdev(link->sink->entity);
626
627 rval = v4l2_subdev_call(sink, pad, link_validate, link,
628 &source_fmt, &sink_fmt);
629 if (rval != -ENOIOCTLCMD)
630 return rval;
631
632 return v4l2_subdev_link_validate_default(
633 sink, link, &source_fmt, &sink_fmt);
634}
635EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
636
637struct v4l2_subdev_pad_config *
638v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd)
639{
640 struct v4l2_subdev_pad_config *cfg;
641 int ret;
642
643 if (!sd->entity.num_pads)
644 return NULL;
645
646 cfg = kvmalloc_array(sd->entity.num_pads, sizeof(*cfg),
647 GFP_KERNEL | __GFP_ZERO);
648 if (!cfg)
649 return NULL;
650
651 ret = v4l2_subdev_call(sd, pad, init_cfg, cfg);
652 if (ret < 0 && ret != -ENOIOCTLCMD) {
653 kvfree(cfg);
654 return NULL;
655 }
656
657 return cfg;
658}
659EXPORT_SYMBOL_GPL(v4l2_subdev_alloc_pad_config);
660
661void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg)
662{
663 kvfree(cfg);
664}
665EXPORT_SYMBOL_GPL(v4l2_subdev_free_pad_config);
666#endif
667
668void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
669{
670 INIT_LIST_HEAD(&sd->list);
671 BUG_ON(!ops);
672 sd->ops = ops;
673 sd->v4l2_dev = NULL;
674 sd->flags = 0;
675 sd->name[0] = '\0';
676 sd->grp_id = 0;
677 sd->dev_priv = NULL;
678 sd->host_priv = NULL;
679#if defined(CONFIG_MEDIA_CONTROLLER)
680 sd->entity.name = sd->name;
681 sd->entity.obj_type = MEDIA_ENTITY_TYPE_V4L2_SUBDEV;
682 sd->entity.function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
683#endif
684}
685EXPORT_SYMBOL(v4l2_subdev_init);
686
687void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
688 const struct v4l2_event *ev)
689{
690 v4l2_event_queue(sd->devnode, ev);
691 v4l2_subdev_notify(sd, V4L2_DEVICE_NOTIFY_EVENT, (void *)ev);
692}
693EXPORT_SYMBOL_GPL(v4l2_subdev_notify_event);
694
