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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * V4L2 sub-device
4 *
5 * Copyright (C) 2010 Nokia Corporation
6 *
7 * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
8 * Sakari Ailus <sakari.ailus@iki.fi>
9 */
10
11#include <linux/ioctl.h>
12#include <linux/mm.h>
13#include <linux/module.h>
14#include <linux/slab.h>
15#include <linux/types.h>
16#include <linux/videodev2.h>
17#include <linux/export.h>
18#include <linux/version.h>
19
20#include <media/v4l2-ctrls.h>
21#include <media/v4l2-device.h>
22#include <media/v4l2-ioctl.h>
23#include <media/v4l2-fh.h>
24#include <media/v4l2-event.h>
25
26#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
27static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
28{
29 struct v4l2_subdev_state *state;
30
31 state = v4l2_subdev_alloc_state(sd);
32 if (IS_ERR(state))
33 return PTR_ERR(state);
34
35 fh->state = state;
36
37 return 0;
38}
39
40static void subdev_fh_free(struct v4l2_subdev_fh *fh)
41{
42 v4l2_subdev_free_state(fh->state);
43 fh->state = NULL;
44}
45
46static int subdev_open(struct file *file)
47{
48 struct video_device *vdev = video_devdata(file);
49 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
50 struct v4l2_subdev_fh *subdev_fh;
51 int ret;
52
53 subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
54 if (subdev_fh == NULL)
55 return -ENOMEM;
56
57 ret = subdev_fh_init(subdev_fh, sd);
58 if (ret) {
59 kfree(subdev_fh);
60 return ret;
61 }
62
63 v4l2_fh_init(&subdev_fh->vfh, vdev);
64 v4l2_fh_add(&subdev_fh->vfh);
65 file->private_data = &subdev_fh->vfh;
66#if defined(CONFIG_MEDIA_CONTROLLER)
67 if (sd->v4l2_dev->mdev && sd->entity.graph_obj.mdev->dev) {
68 struct module *owner;
69
70 owner = sd->entity.graph_obj.mdev->dev->driver->owner;
71 if (!try_module_get(owner)) {
72 ret = -EBUSY;
73 goto err;
74 }
75 subdev_fh->owner = owner;
76 }
77#endif
78
79 if (sd->internal_ops && sd->internal_ops->open) {
80 ret = sd->internal_ops->open(sd, subdev_fh);
81 if (ret < 0)
82 goto err;
83 }
84
85 return 0;
86
87err:
88 module_put(subdev_fh->owner);
89 v4l2_fh_del(&subdev_fh->vfh);
90 v4l2_fh_exit(&subdev_fh->vfh);
91 subdev_fh_free(subdev_fh);
92 kfree(subdev_fh);
93
94 return ret;
95}
96
97static int subdev_close(struct file *file)
98{
99 struct video_device *vdev = video_devdata(file);
100 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
101 struct v4l2_fh *vfh = file->private_data;
102 struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
103
104 if (sd->internal_ops && sd->internal_ops->close)
105 sd->internal_ops->close(sd, subdev_fh);
106 module_put(subdev_fh->owner);
107 v4l2_fh_del(vfh);
108 v4l2_fh_exit(vfh);
109 subdev_fh_free(subdev_fh);
110 kfree(subdev_fh);
111 file->private_data = NULL;
112
113 return 0;
114}
115#else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
116static int subdev_open(struct file *file)
117{
118 return -ENODEV;
119}
120
121static int subdev_close(struct file *file)
122{
123 return -ENODEV;
124}
125#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
126
127static inline int check_which(u32 which)
128{
129 if (which != V4L2_SUBDEV_FORMAT_TRY &&
130 which != V4L2_SUBDEV_FORMAT_ACTIVE)
131 return -EINVAL;
132
133 return 0;
134}
135
136static inline int check_pad(struct v4l2_subdev *sd, u32 pad)
137{
138#if defined(CONFIG_MEDIA_CONTROLLER)
139 if (sd->entity.num_pads) {
140 if (pad >= sd->entity.num_pads)
141 return -EINVAL;
142 return 0;
143 }
144#endif
145 /* allow pad 0 on subdevices not registered as media entities */
146 if (pad > 0)
147 return -EINVAL;
148 return 0;
149}
150
151static int check_state_pads(u32 which, struct v4l2_subdev_state *state)
152{
153 if (which == V4L2_SUBDEV_FORMAT_TRY && (!state || !state->pads))
154 return -EINVAL;
155
156 return 0;
157}
158
159static inline int check_format(struct v4l2_subdev *sd,
160 struct v4l2_subdev_state *state,
161 struct v4l2_subdev_format *format)
162{
163 if (!format)
164 return -EINVAL;
165
166 return check_which(format->which) ? : check_pad(sd, format->pad) ? :
167 check_state_pads(format->which, state);
168}
169
170static int call_get_fmt(struct v4l2_subdev *sd,
171 struct v4l2_subdev_state *state,
172 struct v4l2_subdev_format *format)
173{
174 return check_format(sd, state, format) ? :
175 sd->ops->pad->get_fmt(sd, state, format);
176}
177
178static int call_set_fmt(struct v4l2_subdev *sd,
179 struct v4l2_subdev_state *state,
180 struct v4l2_subdev_format *format)
181{
182 return check_format(sd, state, format) ? :
183 sd->ops->pad->set_fmt(sd, state, format);
184}
185
186static int call_enum_mbus_code(struct v4l2_subdev *sd,
187 struct v4l2_subdev_state *state,
188 struct v4l2_subdev_mbus_code_enum *code)
189{
190 if (!code)
191 return -EINVAL;
192
193 return check_which(code->which) ? : check_pad(sd, code->pad) ? :
194 check_state_pads(code->which, state) ? :
195 sd->ops->pad->enum_mbus_code(sd, state, code);
196}
197
198static int call_enum_frame_size(struct v4l2_subdev *sd,
199 struct v4l2_subdev_state *state,
200 struct v4l2_subdev_frame_size_enum *fse)
201{
202 if (!fse)
203 return -EINVAL;
204
205 return check_which(fse->which) ? : check_pad(sd, fse->pad) ? :
206 check_state_pads(fse->which, state) ? :
207 sd->ops->pad->enum_frame_size(sd, state, fse);
208}
209
210static inline int check_frame_interval(struct v4l2_subdev *sd,
211 struct v4l2_subdev_frame_interval *fi)
212{
213 if (!fi)
214 return -EINVAL;
215
216 return check_pad(sd, fi->pad);
217}
218
219static int call_g_frame_interval(struct v4l2_subdev *sd,
220 struct v4l2_subdev_frame_interval *fi)
221{
222 return check_frame_interval(sd, fi) ? :
223 sd->ops->video->g_frame_interval(sd, fi);
224}
225
226static int call_s_frame_interval(struct v4l2_subdev *sd,
227 struct v4l2_subdev_frame_interval *fi)
228{
229 return check_frame_interval(sd, fi) ? :
230 sd->ops->video->s_frame_interval(sd, fi);
231}
232
233static int call_enum_frame_interval(struct v4l2_subdev *sd,
234 struct v4l2_subdev_state *state,
235 struct v4l2_subdev_frame_interval_enum *fie)
236{
237 if (!fie)
238 return -EINVAL;
239
240 return check_which(fie->which) ? : check_pad(sd, fie->pad) ? :
241 check_state_pads(fie->which, state) ? :
242 sd->ops->pad->enum_frame_interval(sd, state, fie);
243}
244
245static inline int check_selection(struct v4l2_subdev *sd,
246 struct v4l2_subdev_state *state,
247 struct v4l2_subdev_selection *sel)
248{
249 if (!sel)
250 return -EINVAL;
251
252 return check_which(sel->which) ? : check_pad(sd, sel->pad) ? :
253 check_state_pads(sel->which, state);
254}
255
256static int call_get_selection(struct v4l2_subdev *sd,
257 struct v4l2_subdev_state *state,
258 struct v4l2_subdev_selection *sel)
259{
260 return check_selection(sd, state, sel) ? :
261 sd->ops->pad->get_selection(sd, state, sel);
262}
263
264static int call_set_selection(struct v4l2_subdev *sd,
265 struct v4l2_subdev_state *state,
266 struct v4l2_subdev_selection *sel)
267{
268 return check_selection(sd, state, sel) ? :
269 sd->ops->pad->set_selection(sd, state, sel);
270}
271
272static inline int check_edid(struct v4l2_subdev *sd,
273 struct v4l2_subdev_edid *edid)
274{
275 if (!edid)
276 return -EINVAL;
277
278 if (edid->blocks && edid->edid == NULL)
279 return -EINVAL;
280
281 return check_pad(sd, edid->pad);
282}
283
284static int call_get_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
285{
286 return check_edid(sd, edid) ? : sd->ops->pad->get_edid(sd, edid);
287}
288
289static int call_set_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
290{
291 return check_edid(sd, edid) ? : sd->ops->pad->set_edid(sd, edid);
292}
293
294static int call_dv_timings_cap(struct v4l2_subdev *sd,
295 struct v4l2_dv_timings_cap *cap)
296{
297 if (!cap)
298 return -EINVAL;
299
300 return check_pad(sd, cap->pad) ? :
301 sd->ops->pad->dv_timings_cap(sd, cap);
302}
303
304static int call_enum_dv_timings(struct v4l2_subdev *sd,
305 struct v4l2_enum_dv_timings *dvt)
306{
307 if (!dvt)
308 return -EINVAL;
309
310 return check_pad(sd, dvt->pad) ? :
311 sd->ops->pad->enum_dv_timings(sd, dvt);
312}
313
314static int call_get_mbus_config(struct v4l2_subdev *sd, unsigned int pad,
315 struct v4l2_mbus_config *config)
316{
317 return check_pad(sd, pad) ? :
318 sd->ops->pad->get_mbus_config(sd, pad, config);
319}
320
321static int call_set_mbus_config(struct v4l2_subdev *sd, unsigned int pad,
322 struct v4l2_mbus_config *config)
323{
324 return check_pad(sd, pad) ? :
325 sd->ops->pad->get_mbus_config(sd, pad, config);
326}
327
328static const struct v4l2_subdev_pad_ops v4l2_subdev_call_pad_wrappers = {
329 .get_fmt = call_get_fmt,
330 .set_fmt = call_set_fmt,
331 .enum_mbus_code = call_enum_mbus_code,
332 .enum_frame_size = call_enum_frame_size,
333 .enum_frame_interval = call_enum_frame_interval,
334 .get_selection = call_get_selection,
335 .set_selection = call_set_selection,
336 .get_edid = call_get_edid,
337 .set_edid = call_set_edid,
338 .dv_timings_cap = call_dv_timings_cap,
339 .enum_dv_timings = call_enum_dv_timings,
340 .get_mbus_config = call_get_mbus_config,
341 .set_mbus_config = call_set_mbus_config,
342};
343
344static const struct v4l2_subdev_video_ops v4l2_subdev_call_video_wrappers = {
345 .g_frame_interval = call_g_frame_interval,
346 .s_frame_interval = call_s_frame_interval,
347};
348
349const struct v4l2_subdev_ops v4l2_subdev_call_wrappers = {
350 .pad = &v4l2_subdev_call_pad_wrappers,
351 .video = &v4l2_subdev_call_video_wrappers,
352};
353EXPORT_SYMBOL(v4l2_subdev_call_wrappers);
354
355#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
356static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
357{
358 struct video_device *vdev = video_devdata(file);
359 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
360 struct v4l2_fh *vfh = file->private_data;
361 struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
362 bool ro_subdev = test_bit(V4L2_FL_SUBDEV_RO_DEVNODE, &vdev->flags);
363 int rval;
364
365 switch (cmd) {
366 case VIDIOC_SUBDEV_QUERYCAP: {
367 struct v4l2_subdev_capability *cap = arg;
368
369 memset(cap->reserved, 0, sizeof(cap->reserved));
370 cap->version = LINUX_VERSION_CODE;
371 cap->capabilities = ro_subdev ? V4L2_SUBDEV_CAP_RO_SUBDEV : 0;
372
373 return 0;
374 }
375
376 case VIDIOC_QUERYCTRL:
377 /*
378 * TODO: this really should be folded into v4l2_queryctrl (this
379 * currently returns -EINVAL for NULL control handlers).
380 * However, v4l2_queryctrl() is still called directly by
381 * drivers as well and until that has been addressed I believe
382 * it is safer to do the check here. The same is true for the
383 * other control ioctls below.
384 */
385 if (!vfh->ctrl_handler)
386 return -ENOTTY;
387 return v4l2_queryctrl(vfh->ctrl_handler, arg);
388
389 case VIDIOC_QUERY_EXT_CTRL:
390 if (!vfh->ctrl_handler)
391 return -ENOTTY;
392 return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg);
393
394 case VIDIOC_QUERYMENU:
395 if (!vfh->ctrl_handler)
396 return -ENOTTY;
397 return v4l2_querymenu(vfh->ctrl_handler, arg);
398
399 case VIDIOC_G_CTRL:
400 if (!vfh->ctrl_handler)
401 return -ENOTTY;
402 return v4l2_g_ctrl(vfh->ctrl_handler, arg);
403
404 case VIDIOC_S_CTRL:
405 if (!vfh->ctrl_handler)
406 return -ENOTTY;
407 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
408
409 case VIDIOC_G_EXT_CTRLS:
410 if (!vfh->ctrl_handler)
411 return -ENOTTY;
412 return v4l2_g_ext_ctrls(vfh->ctrl_handler,
413 vdev, sd->v4l2_dev->mdev, arg);
414
415 case VIDIOC_S_EXT_CTRLS:
416 if (!vfh->ctrl_handler)
417 return -ENOTTY;
418 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler,
419 vdev, sd->v4l2_dev->mdev, arg);
420
421 case VIDIOC_TRY_EXT_CTRLS:
422 if (!vfh->ctrl_handler)
423 return -ENOTTY;
424 return v4l2_try_ext_ctrls(vfh->ctrl_handler,
425 vdev, sd->v4l2_dev->mdev, arg);
426
427 case VIDIOC_DQEVENT:
428 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
429 return -ENOIOCTLCMD;
430
431 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
432
433 case VIDIOC_SUBSCRIBE_EVENT:
434 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
435
436 case VIDIOC_UNSUBSCRIBE_EVENT:
437 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
438
439#ifdef CONFIG_VIDEO_ADV_DEBUG
440 case VIDIOC_DBG_G_REGISTER:
441 {
442 struct v4l2_dbg_register *p = arg;
443
444 if (!capable(CAP_SYS_ADMIN))
445 return -EPERM;
446 return v4l2_subdev_call(sd, core, g_register, p);
447 }
448 case VIDIOC_DBG_S_REGISTER:
449 {
450 struct v4l2_dbg_register *p = arg;
451
452 if (!capable(CAP_SYS_ADMIN))
453 return -EPERM;
454 return v4l2_subdev_call(sd, core, s_register, p);
455 }
456 case VIDIOC_DBG_G_CHIP_INFO:
457 {
458 struct v4l2_dbg_chip_info *p = arg;
459
460 if (p->match.type != V4L2_CHIP_MATCH_SUBDEV || p->match.addr)
461 return -EINVAL;
462 if (sd->ops->core && sd->ops->core->s_register)
463 p->flags |= V4L2_CHIP_FL_WRITABLE;
464 if (sd->ops->core && sd->ops->core->g_register)
465 p->flags |= V4L2_CHIP_FL_READABLE;
466 strscpy(p->name, sd->name, sizeof(p->name));
467 return 0;
468 }
469#endif
470
471 case VIDIOC_LOG_STATUS: {
472 int ret;
473
474 pr_info("%s: ================= START STATUS =================\n",
475 sd->name);
476 ret = v4l2_subdev_call(sd, core, log_status);
477 pr_info("%s: ================== END STATUS ==================\n",
478 sd->name);
479 return ret;
480 }
481
482 case VIDIOC_SUBDEV_G_FMT: {
483 struct v4l2_subdev_format *format = arg;
484
485 memset(format->reserved, 0, sizeof(format->reserved));
486 memset(format->format.reserved, 0, sizeof(format->format.reserved));
487 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh->state, format);
488 }
489
490 case VIDIOC_SUBDEV_S_FMT: {
491 struct v4l2_subdev_format *format = arg;
492
493 if (format->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
494 return -EPERM;
495
496 memset(format->reserved, 0, sizeof(format->reserved));
497 memset(format->format.reserved, 0, sizeof(format->format.reserved));
498 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh->state, format);
499 }
500
501 case VIDIOC_SUBDEV_G_CROP: {
502 struct v4l2_subdev_crop *crop = arg;
503 struct v4l2_subdev_selection sel;
504
505 memset(crop->reserved, 0, sizeof(crop->reserved));
506 memset(&sel, 0, sizeof(sel));
507 sel.which = crop->which;
508 sel.pad = crop->pad;
509 sel.target = V4L2_SEL_TGT_CROP;
510
511 rval = v4l2_subdev_call(
512 sd, pad, get_selection, subdev_fh->state, &sel);
513
514 crop->rect = sel.r;
515
516 return rval;
517 }
518
519 case VIDIOC_SUBDEV_S_CROP: {
520 struct v4l2_subdev_crop *crop = arg;
521 struct v4l2_subdev_selection sel;
522
523 if (crop->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
524 return -EPERM;
525
526 memset(crop->reserved, 0, sizeof(crop->reserved));
527 memset(&sel, 0, sizeof(sel));
528 sel.which = crop->which;
529 sel.pad = crop->pad;
530 sel.target = V4L2_SEL_TGT_CROP;
531 sel.r = crop->rect;
532
533 rval = v4l2_subdev_call(
534 sd, pad, set_selection, subdev_fh->state, &sel);
535
536 crop->rect = sel.r;
537
538 return rval;
539 }
540
541 case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
542 struct v4l2_subdev_mbus_code_enum *code = arg;
543
544 memset(code->reserved, 0, sizeof(code->reserved));
545 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh->state,
546 code);
547 }
548
549 case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
550 struct v4l2_subdev_frame_size_enum *fse = arg;
551
552 memset(fse->reserved, 0, sizeof(fse->reserved));
553 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh->state,
554 fse);
555 }
556
557 case VIDIOC_SUBDEV_G_FRAME_INTERVAL: {
558 struct v4l2_subdev_frame_interval *fi = arg;
559
560 memset(fi->reserved, 0, sizeof(fi->reserved));
561 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
562 }
563
564 case VIDIOC_SUBDEV_S_FRAME_INTERVAL: {
565 struct v4l2_subdev_frame_interval *fi = arg;
566
567 if (ro_subdev)
568 return -EPERM;
569
570 memset(fi->reserved, 0, sizeof(fi->reserved));
571 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
572 }
573
574 case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
575 struct v4l2_subdev_frame_interval_enum *fie = arg;
576
577 memset(fie->reserved, 0, sizeof(fie->reserved));
578 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh->state,
579 fie);
580 }
581
582 case VIDIOC_SUBDEV_G_SELECTION: {
583 struct v4l2_subdev_selection *sel = arg;
584
585 memset(sel->reserved, 0, sizeof(sel->reserved));
586 return v4l2_subdev_call(
587 sd, pad, get_selection, subdev_fh->state, sel);
588 }
589
590 case VIDIOC_SUBDEV_S_SELECTION: {
591 struct v4l2_subdev_selection *sel = arg;
592
593 if (sel->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
594 return -EPERM;
595
596 memset(sel->reserved, 0, sizeof(sel->reserved));
597 return v4l2_subdev_call(
598 sd, pad, set_selection, subdev_fh->state, sel);
599 }
600
601 case VIDIOC_G_EDID: {
602 struct v4l2_subdev_edid *edid = arg;
603
604 return v4l2_subdev_call(sd, pad, get_edid, edid);
605 }
606
607 case VIDIOC_S_EDID: {
608 struct v4l2_subdev_edid *edid = arg;
609
610 return v4l2_subdev_call(sd, pad, set_edid, edid);
611 }
612
613 case VIDIOC_SUBDEV_DV_TIMINGS_CAP: {
614 struct v4l2_dv_timings_cap *cap = arg;
615
616 return v4l2_subdev_call(sd, pad, dv_timings_cap, cap);
617 }
618
619 case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: {
620 struct v4l2_enum_dv_timings *dvt = arg;
621
622 return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt);
623 }
624
625 case VIDIOC_SUBDEV_QUERY_DV_TIMINGS:
626 return v4l2_subdev_call(sd, video, query_dv_timings, arg);
627
628 case VIDIOC_SUBDEV_G_DV_TIMINGS:
629 return v4l2_subdev_call(sd, video, g_dv_timings, arg);
630
631 case VIDIOC_SUBDEV_S_DV_TIMINGS:
632 if (ro_subdev)
633 return -EPERM;
634
635 return v4l2_subdev_call(sd, video, s_dv_timings, arg);
636
637 case VIDIOC_SUBDEV_G_STD:
638 return v4l2_subdev_call(sd, video, g_std, arg);
639
640 case VIDIOC_SUBDEV_S_STD: {
641 v4l2_std_id *std = arg;
642
643 if (ro_subdev)
644 return -EPERM;
645
646 return v4l2_subdev_call(sd, video, s_std, *std);
647 }
648
649 case VIDIOC_SUBDEV_ENUMSTD: {
650 struct v4l2_standard *p = arg;
651 v4l2_std_id id;
652
653 if (v4l2_subdev_call(sd, video, g_tvnorms, &id))
654 return -EINVAL;
655
656 return v4l_video_std_enumstd(p, id);
657 }
658
659 case VIDIOC_SUBDEV_QUERYSTD:
660 return v4l2_subdev_call(sd, video, querystd, arg);
661
662 default:
663 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
664 }
665
666 return 0;
667}
668
669static long subdev_do_ioctl_lock(struct file *file, unsigned int cmd, void *arg)
670{
671 struct video_device *vdev = video_devdata(file);
672 struct mutex *lock = vdev->lock;
673 long ret = -ENODEV;
674
675 if (lock && mutex_lock_interruptible(lock))
676 return -ERESTARTSYS;
677 if (video_is_registered(vdev))
678 ret = subdev_do_ioctl(file, cmd, arg);
679 if (lock)
680 mutex_unlock(lock);
681 return ret;
682}
683
684static long subdev_ioctl(struct file *file, unsigned int cmd,
685 unsigned long arg)
686{
687 return video_usercopy(file, cmd, arg, subdev_do_ioctl_lock);
688}
689
690#ifdef CONFIG_COMPAT
691static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
692 unsigned long arg)
693{
694 struct video_device *vdev = video_devdata(file);
695 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
696
697 return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg);
698}
699#endif
700
701#else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
702static long subdev_ioctl(struct file *file, unsigned int cmd,
703 unsigned long arg)
704{
705 return -ENODEV;
706}
707
708#ifdef CONFIG_COMPAT
709static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
710 unsigned long arg)
711{
712 return -ENODEV;
713}
714#endif
715#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
716
717static __poll_t subdev_poll(struct file *file, poll_table *wait)
718{
719 struct video_device *vdev = video_devdata(file);
720 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
721 struct v4l2_fh *fh = file->private_data;
722
723 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
724 return EPOLLERR;
725
726 poll_wait(file, &fh->wait, wait);
727
728 if (v4l2_event_pending(fh))
729 return EPOLLPRI;
730
731 return 0;
732}
733
734const struct v4l2_file_operations v4l2_subdev_fops = {
735 .owner = THIS_MODULE,
736 .open = subdev_open,
737 .unlocked_ioctl = subdev_ioctl,
738#ifdef CONFIG_COMPAT
739 .compat_ioctl32 = subdev_compat_ioctl32,
740#endif
741 .release = subdev_close,
742 .poll = subdev_poll,
743};
744
745#ifdef CONFIG_MEDIA_CONTROLLER
746
747int v4l2_subdev_get_fwnode_pad_1_to_1(struct media_entity *entity,
748 struct fwnode_endpoint *endpoint)
749{
750 struct fwnode_handle *fwnode;
751 struct v4l2_subdev *sd;
752
753 if (!is_media_entity_v4l2_subdev(entity))
754 return -EINVAL;
755
756 sd = media_entity_to_v4l2_subdev(entity);
757
758 fwnode = fwnode_graph_get_port_parent(endpoint->local_fwnode);
759 fwnode_handle_put(fwnode);
760
761 if (dev_fwnode(sd->dev) == fwnode)
762 return endpoint->port;
763
764 return -ENXIO;
765}
766EXPORT_SYMBOL_GPL(v4l2_subdev_get_fwnode_pad_1_to_1);
767
768int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
769 struct media_link *link,
770 struct v4l2_subdev_format *source_fmt,
771 struct v4l2_subdev_format *sink_fmt)
772{
773 bool pass = true;
774
775 /* The width, height and code must match. */
776 if (source_fmt->format.width != sink_fmt->format.width) {
777 dev_dbg(sd->entity.graph_obj.mdev->dev,
778 "%s: width does not match (source %u, sink %u)\n",
779 __func__,
780 source_fmt->format.width, sink_fmt->format.width);
781 pass = false;
782 }
783
784 if (source_fmt->format.height != sink_fmt->format.height) {
785 dev_dbg(sd->entity.graph_obj.mdev->dev,
786 "%s: height does not match (source %u, sink %u)\n",
787 __func__,
788 source_fmt->format.height, sink_fmt->format.height);
789 pass = false;
790 }
791
792 if (source_fmt->format.code != sink_fmt->format.code) {
793 dev_dbg(sd->entity.graph_obj.mdev->dev,
794 "%s: media bus code does not match (source 0x%8.8x, sink 0x%8.8x)\n",
795 __func__,
796 source_fmt->format.code, sink_fmt->format.code);
797 pass = false;
798 }
799
800 /* The field order must match, or the sink field order must be NONE
801 * to support interlaced hardware connected to bridges that support
802 * progressive formats only.
803 */
804 if (source_fmt->format.field != sink_fmt->format.field &&
805 sink_fmt->format.field != V4L2_FIELD_NONE) {
806 dev_dbg(sd->entity.graph_obj.mdev->dev,
807 "%s: field does not match (source %u, sink %u)\n",
808 __func__,
809 source_fmt->format.field, sink_fmt->format.field);
810 pass = false;
811 }
812
813 if (pass)
814 return 0;
815
816 dev_dbg(sd->entity.graph_obj.mdev->dev,
817 "%s: link was \"%s\":%u -> \"%s\":%u\n", __func__,
818 link->source->entity->name, link->source->index,
819 link->sink->entity->name, link->sink->index);
820
821 return -EPIPE;
822}
823EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);
824
825static int
826v4l2_subdev_link_validate_get_format(struct media_pad *pad,
827 struct v4l2_subdev_format *fmt)
828{
829 if (is_media_entity_v4l2_subdev(pad->entity)) {
830 struct v4l2_subdev *sd =
831 media_entity_to_v4l2_subdev(pad->entity);
832
833 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
834 fmt->pad = pad->index;
835 return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
836 }
837
838 WARN(pad->entity->function != MEDIA_ENT_F_IO_V4L,
839 "Driver bug! Wrong media entity type 0x%08x, entity %s\n",
840 pad->entity->function, pad->entity->name);
841
842 return -EINVAL;
843}
844
845int v4l2_subdev_link_validate(struct media_link *link)
846{
847 struct v4l2_subdev *sink;
848 struct v4l2_subdev_format sink_fmt, source_fmt;
849 int rval;
850
851 rval = v4l2_subdev_link_validate_get_format(
852 link->source, &source_fmt);
853 if (rval < 0)
854 return 0;
855
856 rval = v4l2_subdev_link_validate_get_format(
857 link->sink, &sink_fmt);
858 if (rval < 0)
859 return 0;
860
861 sink = media_entity_to_v4l2_subdev(link->sink->entity);
862
863 rval = v4l2_subdev_call(sink, pad, link_validate, link,
864 &source_fmt, &sink_fmt);
865 if (rval != -ENOIOCTLCMD)
866 return rval;
867
868 return v4l2_subdev_link_validate_default(
869 sink, link, &source_fmt, &sink_fmt);
870}
871EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
872
873struct v4l2_subdev_state *v4l2_subdev_alloc_state(struct v4l2_subdev *sd)
874{
875 struct v4l2_subdev_state *state;
876 int ret;
877
878 state = kzalloc(sizeof(*state), GFP_KERNEL);
879 if (!state)
880 return ERR_PTR(-ENOMEM);
881
882 if (sd->entity.num_pads) {
883 state->pads = kvmalloc_array(sd->entity.num_pads,
884 sizeof(*state->pads),
885 GFP_KERNEL | __GFP_ZERO);
886 if (!state->pads) {
887 ret = -ENOMEM;
888 goto err;
889 }
890 }
891
892 ret = v4l2_subdev_call(sd, pad, init_cfg, state);
893 if (ret < 0 && ret != -ENOIOCTLCMD)
894 goto err;
895
896 return state;
897
898err:
899 if (state && state->pads)
900 kvfree(state->pads);
901
902 kfree(state);
903
904 return ERR_PTR(ret);
905}
906EXPORT_SYMBOL_GPL(v4l2_subdev_alloc_state);
907
908void v4l2_subdev_free_state(struct v4l2_subdev_state *state)
909{
910 if (!state)
911 return;
912
913 kvfree(state->pads);
914 kfree(state);
915}
916EXPORT_SYMBOL_GPL(v4l2_subdev_free_state);
917
918#endif /* CONFIG_MEDIA_CONTROLLER */
919
920void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
921{
922 INIT_LIST_HEAD(&sd->list);
923 BUG_ON(!ops);
924 sd->ops = ops;
925 sd->v4l2_dev = NULL;
926 sd->flags = 0;
927 sd->name[0] = '\0';
928 sd->grp_id = 0;
929 sd->dev_priv = NULL;
930 sd->host_priv = NULL;
931#if defined(CONFIG_MEDIA_CONTROLLER)
932 sd->entity.name = sd->name;
933 sd->entity.obj_type = MEDIA_ENTITY_TYPE_V4L2_SUBDEV;
934 sd->entity.function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
935#endif
936}
937EXPORT_SYMBOL(v4l2_subdev_init);
938
939void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
940 const struct v4l2_event *ev)
941{
942 v4l2_event_queue(sd->devnode, ev);
943 v4l2_subdev_notify(sd, V4L2_DEVICE_NOTIFY_EVENT, (void *)ev);
944}
945EXPORT_SYMBOL_GPL(v4l2_subdev_notify_event);