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
19 #include <media/v4l2-ctrls.h>
20 #include <media/v4l2-device.h>
21 #include <media/v4l2-ioctl.h>
22 #include <media/v4l2-fh.h>
23 #include <media/v4l2-event.h>
24
subdev_fh_init(struct v4l2_subdev_fh * fh,struct v4l2_subdev * sd)25 static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
26 {
27 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
28 if (sd->entity.num_pads) {
29 fh->pad = v4l2_subdev_alloc_pad_config(sd);
30 if (fh->pad == NULL)
31 return -ENOMEM;
32 }
33 #endif
34 return 0;
35 }
36
subdev_fh_free(struct v4l2_subdev_fh * fh)37 static void subdev_fh_free(struct v4l2_subdev_fh *fh)
38 {
39 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
40 v4l2_subdev_free_pad_config(fh->pad);
41 fh->pad = NULL;
42 #endif
43 }
44
subdev_open(struct file * file)45 static int subdev_open(struct file *file)
46 {
47 struct video_device *vdev = video_devdata(file);
48 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
49 struct v4l2_subdev_fh *subdev_fh;
50 int ret;
51
52 subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
53 if (subdev_fh == NULL)
54 return -ENOMEM;
55
56 ret = subdev_fh_init(subdev_fh, sd);
57 if (ret) {
58 kfree(subdev_fh);
59 return ret;
60 }
61
62 v4l2_fh_init(&subdev_fh->vfh, vdev);
63 v4l2_fh_add(&subdev_fh->vfh);
64 file->private_data = &subdev_fh->vfh;
65 #if defined(CONFIG_MEDIA_CONTROLLER)
66 if (sd->v4l2_dev->mdev && sd->entity.graph_obj.mdev->dev) {
67 struct module *owner;
68
69 owner = sd->entity.graph_obj.mdev->dev->driver->owner;
70 if (!try_module_get(owner)) {
71 ret = -EBUSY;
72 goto err;
73 }
74 subdev_fh->owner = owner;
75 }
76 #endif
77
78 if (sd->internal_ops && sd->internal_ops->open) {
79 ret = sd->internal_ops->open(sd, subdev_fh);
80 if (ret < 0)
81 goto err;
82 }
83
84 return 0;
85
86 err:
87 module_put(subdev_fh->owner);
88 v4l2_fh_del(&subdev_fh->vfh);
89 v4l2_fh_exit(&subdev_fh->vfh);
90 subdev_fh_free(subdev_fh);
91 kfree(subdev_fh);
92
93 return ret;
94 }
95
subdev_close(struct file * file)96 static int subdev_close(struct file *file)
97 {
98 struct video_device *vdev = video_devdata(file);
99 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
100 struct v4l2_fh *vfh = file->private_data;
101 struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
102
103 if (sd->internal_ops && sd->internal_ops->close)
104 sd->internal_ops->close(sd, subdev_fh);
105 module_put(subdev_fh->owner);
106 v4l2_fh_del(vfh);
107 v4l2_fh_exit(vfh);
108 subdev_fh_free(subdev_fh);
109 kfree(subdev_fh);
110 file->private_data = NULL;
111
112 return 0;
113 }
114
check_which(__u32 which)115 static inline int check_which(__u32 which)
116 {
117 if (which != V4L2_SUBDEV_FORMAT_TRY &&
118 which != V4L2_SUBDEV_FORMAT_ACTIVE)
119 return -EINVAL;
120
121 return 0;
122 }
123
check_pad(struct v4l2_subdev * sd,__u32 pad)124 static inline int check_pad(struct v4l2_subdev *sd, __u32 pad)
125 {
126 #if defined(CONFIG_MEDIA_CONTROLLER)
127 if (sd->entity.num_pads) {
128 if (pad >= sd->entity.num_pads)
129 return -EINVAL;
130 return 0;
131 }
132 #endif
133 /* allow pad 0 on subdevices not registered as media entities */
134 if (pad > 0)
135 return -EINVAL;
136 return 0;
137 }
138
check_cfg(__u32 which,struct v4l2_subdev_pad_config * cfg)139 static int check_cfg(__u32 which, struct v4l2_subdev_pad_config *cfg)
140 {
141 if (which == V4L2_SUBDEV_FORMAT_TRY && !cfg)
142 return -EINVAL;
143
144 return 0;
145 }
146
check_format(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * format)147 static inline int check_format(struct v4l2_subdev *sd,
148 struct v4l2_subdev_pad_config *cfg,
149 struct v4l2_subdev_format *format)
150 {
151 if (!format)
152 return -EINVAL;
153
154 return check_which(format->which) ? : check_pad(sd, format->pad) ? :
155 check_cfg(format->which, cfg);
156 }
157
call_get_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * format)158 static int call_get_fmt(struct v4l2_subdev *sd,
159 struct v4l2_subdev_pad_config *cfg,
160 struct v4l2_subdev_format *format)
161 {
162 return check_format(sd, cfg, format) ? :
163 sd->ops->pad->get_fmt(sd, cfg, format);
164 }
165
call_set_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * format)166 static int call_set_fmt(struct v4l2_subdev *sd,
167 struct v4l2_subdev_pad_config *cfg,
168 struct v4l2_subdev_format *format)
169 {
170 return check_format(sd, cfg, format) ? :
171 sd->ops->pad->set_fmt(sd, cfg, format);
172 }
173
call_enum_mbus_code(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_mbus_code_enum * code)174 static int call_enum_mbus_code(struct v4l2_subdev *sd,
175 struct v4l2_subdev_pad_config *cfg,
176 struct v4l2_subdev_mbus_code_enum *code)
177 {
178 if (!code)
179 return -EINVAL;
180
181 return check_which(code->which) ? : check_pad(sd, code->pad) ? :
182 check_cfg(code->which, cfg) ? :
183 sd->ops->pad->enum_mbus_code(sd, cfg, code);
184 }
185
call_enum_frame_size(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_frame_size_enum * fse)186 static int call_enum_frame_size(struct v4l2_subdev *sd,
187 struct v4l2_subdev_pad_config *cfg,
188 struct v4l2_subdev_frame_size_enum *fse)
189 {
190 if (!fse)
191 return -EINVAL;
192
193 return check_which(fse->which) ? : check_pad(sd, fse->pad) ? :
194 check_cfg(fse->which, cfg) ? :
195 sd->ops->pad->enum_frame_size(sd, cfg, fse);
196 }
197
check_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_frame_interval * fi)198 static inline int check_frame_interval(struct v4l2_subdev *sd,
199 struct v4l2_subdev_frame_interval *fi)
200 {
201 if (!fi)
202 return -EINVAL;
203
204 return check_pad(sd, fi->pad);
205 }
206
call_g_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_frame_interval * fi)207 static int call_g_frame_interval(struct v4l2_subdev *sd,
208 struct v4l2_subdev_frame_interval *fi)
209 {
210 return check_frame_interval(sd, fi) ? :
211 sd->ops->video->g_frame_interval(sd, fi);
212 }
213
call_s_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_frame_interval * fi)214 static int call_s_frame_interval(struct v4l2_subdev *sd,
215 struct v4l2_subdev_frame_interval *fi)
216 {
217 return check_frame_interval(sd, fi) ? :
218 sd->ops->video->s_frame_interval(sd, fi);
219 }
220
call_enum_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_frame_interval_enum * fie)221 static int call_enum_frame_interval(struct v4l2_subdev *sd,
222 struct v4l2_subdev_pad_config *cfg,
223 struct v4l2_subdev_frame_interval_enum *fie)
224 {
225 if (!fie)
226 return -EINVAL;
227
228 return check_which(fie->which) ? : check_pad(sd, fie->pad) ? :
229 check_cfg(fie->which, cfg) ? :
230 sd->ops->pad->enum_frame_interval(sd, cfg, fie);
231 }
232
check_selection(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_selection * sel)233 static inline int check_selection(struct v4l2_subdev *sd,
234 struct v4l2_subdev_pad_config *cfg,
235 struct v4l2_subdev_selection *sel)
236 {
237 if (!sel)
238 return -EINVAL;
239
240 return check_which(sel->which) ? : check_pad(sd, sel->pad) ? :
241 check_cfg(sel->which, cfg);
242 }
243
call_get_selection(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_selection * sel)244 static int call_get_selection(struct v4l2_subdev *sd,
245 struct v4l2_subdev_pad_config *cfg,
246 struct v4l2_subdev_selection *sel)
247 {
248 return check_selection(sd, cfg, sel) ? :
249 sd->ops->pad->get_selection(sd, cfg, sel);
250 }
251
call_set_selection(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_selection * sel)252 static int call_set_selection(struct v4l2_subdev *sd,
253 struct v4l2_subdev_pad_config *cfg,
254 struct v4l2_subdev_selection *sel)
255 {
256 return check_selection(sd, cfg, sel) ? :
257 sd->ops->pad->set_selection(sd, cfg, sel);
258 }
259
check_edid(struct v4l2_subdev * sd,struct v4l2_subdev_edid * edid)260 static inline int check_edid(struct v4l2_subdev *sd,
261 struct v4l2_subdev_edid *edid)
262 {
263 if (!edid)
264 return -EINVAL;
265
266 if (edid->blocks && edid->edid == NULL)
267 return -EINVAL;
268
269 return check_pad(sd, edid->pad);
270 }
271
call_get_edid(struct v4l2_subdev * sd,struct v4l2_subdev_edid * edid)272 static int call_get_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
273 {
274 return check_edid(sd, edid) ? : sd->ops->pad->get_edid(sd, edid);
275 }
276
call_set_edid(struct v4l2_subdev * sd,struct v4l2_subdev_edid * edid)277 static int call_set_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
278 {
279 return check_edid(sd, edid) ? : sd->ops->pad->set_edid(sd, edid);
280 }
281
call_dv_timings_cap(struct v4l2_subdev * sd,struct v4l2_dv_timings_cap * cap)282 static int call_dv_timings_cap(struct v4l2_subdev *sd,
283 struct v4l2_dv_timings_cap *cap)
284 {
285 if (!cap)
286 return -EINVAL;
287
288 return check_pad(sd, cap->pad) ? :
289 sd->ops->pad->dv_timings_cap(sd, cap);
290 }
291
call_enum_dv_timings(struct v4l2_subdev * sd,struct v4l2_enum_dv_timings * dvt)292 static int call_enum_dv_timings(struct v4l2_subdev *sd,
293 struct v4l2_enum_dv_timings *dvt)
294 {
295 if (!dvt)
296 return -EINVAL;
297
298 return check_pad(sd, dvt->pad) ? :
299 sd->ops->pad->enum_dv_timings(sd, dvt);
300 }
301
302 static const struct v4l2_subdev_pad_ops v4l2_subdev_call_pad_wrappers = {
303 .get_fmt = call_get_fmt,
304 .set_fmt = call_set_fmt,
305 .enum_mbus_code = call_enum_mbus_code,
306 .enum_frame_size = call_enum_frame_size,
307 .enum_frame_interval = call_enum_frame_interval,
308 .get_selection = call_get_selection,
309 .set_selection = call_set_selection,
310 .get_edid = call_get_edid,
311 .set_edid = call_set_edid,
312 .dv_timings_cap = call_dv_timings_cap,
313 .enum_dv_timings = call_enum_dv_timings,
314 };
315
316 static const struct v4l2_subdev_video_ops v4l2_subdev_call_video_wrappers = {
317 .g_frame_interval = call_g_frame_interval,
318 .s_frame_interval = call_s_frame_interval,
319 };
320
321 const struct v4l2_subdev_ops v4l2_subdev_call_wrappers = {
322 .pad = &v4l2_subdev_call_pad_wrappers,
323 .video = &v4l2_subdev_call_video_wrappers,
324 };
325 EXPORT_SYMBOL(v4l2_subdev_call_wrappers);
326
subdev_do_ioctl(struct file * file,unsigned int cmd,void * arg)327 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
328 {
329 struct video_device *vdev = video_devdata(file);
330 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
331 struct v4l2_fh *vfh = file->private_data;
332 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
333 struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
334 int rval;
335 #endif
336
337 switch (cmd) {
338 case VIDIOC_QUERYCTRL:
339 /*
340 * TODO: this really should be folded into v4l2_queryctrl (this
341 * currently returns -EINVAL for NULL control handlers).
342 * However, v4l2_queryctrl() is still called directly by
343 * drivers as well and until that has been addressed I believe
344 * it is safer to do the check here. The same is true for the
345 * other control ioctls below.
346 */
347 if (!vfh->ctrl_handler)
348 return -ENOTTY;
349 return v4l2_queryctrl(vfh->ctrl_handler, arg);
350
351 case VIDIOC_QUERY_EXT_CTRL:
352 if (!vfh->ctrl_handler)
353 return -ENOTTY;
354 return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg);
355
356 case VIDIOC_QUERYMENU:
357 if (!vfh->ctrl_handler)
358 return -ENOTTY;
359 return v4l2_querymenu(vfh->ctrl_handler, arg);
360
361 case VIDIOC_G_CTRL:
362 if (!vfh->ctrl_handler)
363 return -ENOTTY;
364 return v4l2_g_ctrl(vfh->ctrl_handler, arg);
365
366 case VIDIOC_S_CTRL:
367 if (!vfh->ctrl_handler)
368 return -ENOTTY;
369 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
370
371 case VIDIOC_G_EXT_CTRLS:
372 if (!vfh->ctrl_handler)
373 return -ENOTTY;
374 return v4l2_g_ext_ctrls(vfh->ctrl_handler,
375 vdev, sd->v4l2_dev->mdev, arg);
376
377 case VIDIOC_S_EXT_CTRLS:
378 if (!vfh->ctrl_handler)
379 return -ENOTTY;
380 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler,
381 vdev, sd->v4l2_dev->mdev, arg);
382
383 case VIDIOC_TRY_EXT_CTRLS:
384 if (!vfh->ctrl_handler)
385 return -ENOTTY;
386 return v4l2_try_ext_ctrls(vfh->ctrl_handler,
387 vdev, sd->v4l2_dev->mdev, arg);
388
389 case VIDIOC_DQEVENT:
390 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
391 return -ENOIOCTLCMD;
392
393 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
394
395 case VIDIOC_SUBSCRIBE_EVENT:
396 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
397
398 case VIDIOC_UNSUBSCRIBE_EVENT:
399 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
400
401 #ifdef CONFIG_VIDEO_ADV_DEBUG
402 case VIDIOC_DBG_G_REGISTER:
403 {
404 struct v4l2_dbg_register *p = arg;
405
406 if (!capable(CAP_SYS_ADMIN))
407 return -EPERM;
408 return v4l2_subdev_call(sd, core, g_register, p);
409 }
410 case VIDIOC_DBG_S_REGISTER:
411 {
412 struct v4l2_dbg_register *p = arg;
413
414 if (!capable(CAP_SYS_ADMIN))
415 return -EPERM;
416 return v4l2_subdev_call(sd, core, s_register, p);
417 }
418 case VIDIOC_DBG_G_CHIP_INFO:
419 {
420 struct v4l2_dbg_chip_info *p = arg;
421
422 if (p->match.type != V4L2_CHIP_MATCH_SUBDEV || p->match.addr)
423 return -EINVAL;
424 if (sd->ops->core && sd->ops->core->s_register)
425 p->flags |= V4L2_CHIP_FL_WRITABLE;
426 if (sd->ops->core && sd->ops->core->g_register)
427 p->flags |= V4L2_CHIP_FL_READABLE;
428 strscpy(p->name, sd->name, sizeof(p->name));
429 return 0;
430 }
431 #endif
432
433 case VIDIOC_LOG_STATUS: {
434 int ret;
435
436 pr_info("%s: ================= START STATUS =================\n",
437 sd->name);
438 ret = v4l2_subdev_call(sd, core, log_status);
439 pr_info("%s: ================== END STATUS ==================\n",
440 sd->name);
441 return ret;
442 }
443
444 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
445 case VIDIOC_SUBDEV_G_FMT: {
446 struct v4l2_subdev_format *format = arg;
447
448 memset(format->reserved, 0, sizeof(format->reserved));
449 memset(format->format.reserved, 0, sizeof(format->format.reserved));
450 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh->pad, format);
451 }
452
453 case VIDIOC_SUBDEV_S_FMT: {
454 struct v4l2_subdev_format *format = arg;
455
456 memset(format->reserved, 0, sizeof(format->reserved));
457 memset(format->format.reserved, 0, sizeof(format->format.reserved));
458 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh->pad, format);
459 }
460
461 case VIDIOC_SUBDEV_G_CROP: {
462 struct v4l2_subdev_crop *crop = arg;
463 struct v4l2_subdev_selection sel;
464
465 memset(crop->reserved, 0, sizeof(crop->reserved));
466 memset(&sel, 0, sizeof(sel));
467 sel.which = crop->which;
468 sel.pad = crop->pad;
469 sel.target = V4L2_SEL_TGT_CROP;
470
471 rval = v4l2_subdev_call(
472 sd, pad, get_selection, subdev_fh->pad, &sel);
473
474 crop->rect = sel.r;
475
476 return rval;
477 }
478
479 case VIDIOC_SUBDEV_S_CROP: {
480 struct v4l2_subdev_crop *crop = arg;
481 struct v4l2_subdev_selection sel;
482
483 memset(crop->reserved, 0, sizeof(crop->reserved));
484 memset(&sel, 0, sizeof(sel));
485 sel.which = crop->which;
486 sel.pad = crop->pad;
487 sel.target = V4L2_SEL_TGT_CROP;
488 sel.r = crop->rect;
489
490 rval = v4l2_subdev_call(
491 sd, pad, set_selection, subdev_fh->pad, &sel);
492
493 crop->rect = sel.r;
494
495 return rval;
496 }
497
498 case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
499 struct v4l2_subdev_mbus_code_enum *code = arg;
500
501 memset(code->reserved, 0, sizeof(code->reserved));
502 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh->pad,
503 code);
504 }
505
506 case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
507 struct v4l2_subdev_frame_size_enum *fse = arg;
508
509 memset(fse->reserved, 0, sizeof(fse->reserved));
510 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh->pad,
511 fse);
512 }
513
514 case VIDIOC_SUBDEV_G_FRAME_INTERVAL: {
515 struct v4l2_subdev_frame_interval *fi = arg;
516
517 memset(fi->reserved, 0, sizeof(fi->reserved));
518 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
519 }
520
521 case VIDIOC_SUBDEV_S_FRAME_INTERVAL: {
522 struct v4l2_subdev_frame_interval *fi = arg;
523
524 memset(fi->reserved, 0, sizeof(fi->reserved));
525 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
526 }
527
528 case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
529 struct v4l2_subdev_frame_interval_enum *fie = arg;
530
531 memset(fie->reserved, 0, sizeof(fie->reserved));
532 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh->pad,
533 fie);
534 }
535
536 case VIDIOC_SUBDEV_G_SELECTION: {
537 struct v4l2_subdev_selection *sel = arg;
538
539 memset(sel->reserved, 0, sizeof(sel->reserved));
540 return v4l2_subdev_call(
541 sd, pad, get_selection, subdev_fh->pad, sel);
542 }
543
544 case VIDIOC_SUBDEV_S_SELECTION: {
545 struct v4l2_subdev_selection *sel = arg;
546
547 memset(sel->reserved, 0, sizeof(sel->reserved));
548 return v4l2_subdev_call(
549 sd, pad, set_selection, subdev_fh->pad, sel);
550 }
551
552 case VIDIOC_G_EDID: {
553 struct v4l2_subdev_edid *edid = arg;
554
555 return v4l2_subdev_call(sd, pad, get_edid, edid);
556 }
557
558 case VIDIOC_S_EDID: {
559 struct v4l2_subdev_edid *edid = arg;
560
561 return v4l2_subdev_call(sd, pad, set_edid, edid);
562 }
563
564 case VIDIOC_SUBDEV_DV_TIMINGS_CAP: {
565 struct v4l2_dv_timings_cap *cap = arg;
566
567 return v4l2_subdev_call(sd, pad, dv_timings_cap, cap);
568 }
569
570 case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: {
571 struct v4l2_enum_dv_timings *dvt = arg;
572
573 return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt);
574 }
575
576 case VIDIOC_SUBDEV_QUERY_DV_TIMINGS:
577 return v4l2_subdev_call(sd, video, query_dv_timings, arg);
578
579 case VIDIOC_SUBDEV_G_DV_TIMINGS:
580 return v4l2_subdev_call(sd, video, g_dv_timings, arg);
581
582 case VIDIOC_SUBDEV_S_DV_TIMINGS:
583 return v4l2_subdev_call(sd, video, s_dv_timings, arg);
584
585 case VIDIOC_SUBDEV_G_STD:
586 return v4l2_subdev_call(sd, video, g_std, arg);
587
588 case VIDIOC_SUBDEV_S_STD: {
589 v4l2_std_id *std = arg;
590
591 return v4l2_subdev_call(sd, video, s_std, *std);
592 }
593
594 case VIDIOC_SUBDEV_ENUMSTD: {
595 struct v4l2_standard *p = arg;
596 v4l2_std_id id;
597
598 if (v4l2_subdev_call(sd, video, g_tvnorms, &id))
599 return -EINVAL;
600
601 return v4l_video_std_enumstd(p, id);
602 }
603
604 case VIDIOC_SUBDEV_QUERYSTD:
605 return v4l2_subdev_call(sd, video, querystd, arg);
606 #endif
607 default:
608 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
609 }
610
611 return 0;
612 }
613
subdev_do_ioctl_lock(struct file * file,unsigned int cmd,void * arg)614 static long subdev_do_ioctl_lock(struct file *file, unsigned int cmd, void *arg)
615 {
616 struct video_device *vdev = video_devdata(file);
617 struct mutex *lock = vdev->lock;
618 long ret = -ENODEV;
619
620 if (lock && mutex_lock_interruptible(lock))
621 return -ERESTARTSYS;
622 if (video_is_registered(vdev))
623 ret = subdev_do_ioctl(file, cmd, arg);
624 if (lock)
625 mutex_unlock(lock);
626 return ret;
627 }
628
subdev_ioctl(struct file * file,unsigned int cmd,unsigned long arg)629 static long subdev_ioctl(struct file *file, unsigned int cmd,
630 unsigned long arg)
631 {
632 return video_usercopy(file, cmd, arg, subdev_do_ioctl_lock);
633 }
634
635 #ifdef CONFIG_COMPAT
subdev_compat_ioctl32(struct file * file,unsigned int cmd,unsigned long arg)636 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
637 unsigned long arg)
638 {
639 struct video_device *vdev = video_devdata(file);
640 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
641
642 return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg);
643 }
644 #endif
645
subdev_poll(struct file * file,poll_table * wait)646 static __poll_t subdev_poll(struct file *file, poll_table *wait)
647 {
648 struct video_device *vdev = video_devdata(file);
649 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
650 struct v4l2_fh *fh = file->private_data;
651
652 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
653 return EPOLLERR;
654
655 poll_wait(file, &fh->wait, wait);
656
657 if (v4l2_event_pending(fh))
658 return EPOLLPRI;
659
660 return 0;
661 }
662
663 const struct v4l2_file_operations v4l2_subdev_fops = {
664 .owner = THIS_MODULE,
665 .open = subdev_open,
666 .unlocked_ioctl = subdev_ioctl,
667 #ifdef CONFIG_COMPAT
668 .compat_ioctl32 = subdev_compat_ioctl32,
669 #endif
670 .release = subdev_close,
671 .poll = subdev_poll,
672 };
673
674 #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)675 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
676 struct media_link *link,
677 struct v4l2_subdev_format *source_fmt,
678 struct v4l2_subdev_format *sink_fmt)
679 {
680 /* The width, height and code must match. */
681 if (source_fmt->format.width != sink_fmt->format.width
682 || source_fmt->format.height != sink_fmt->format.height
683 || source_fmt->format.code != sink_fmt->format.code)
684 return -EPIPE;
685
686 /* The field order must match, or the sink field order must be NONE
687 * to support interlaced hardware connected to bridges that support
688 * progressive formats only.
689 */
690 if (source_fmt->format.field != sink_fmt->format.field &&
691 sink_fmt->format.field != V4L2_FIELD_NONE)
692 return -EPIPE;
693
694 return 0;
695 }
696 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);
697
698 static int
v4l2_subdev_link_validate_get_format(struct media_pad * pad,struct v4l2_subdev_format * fmt)699 v4l2_subdev_link_validate_get_format(struct media_pad *pad,
700 struct v4l2_subdev_format *fmt)
701 {
702 if (is_media_entity_v4l2_subdev(pad->entity)) {
703 struct v4l2_subdev *sd =
704 media_entity_to_v4l2_subdev(pad->entity);
705
706 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
707 fmt->pad = pad->index;
708 return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
709 }
710
711 WARN(pad->entity->function != MEDIA_ENT_F_IO_V4L,
712 "Driver bug! Wrong media entity type 0x%08x, entity %s\n",
713 pad->entity->function, pad->entity->name);
714
715 return -EINVAL;
716 }
717
v4l2_subdev_link_validate(struct media_link * link)718 int v4l2_subdev_link_validate(struct media_link *link)
719 {
720 struct v4l2_subdev *sink;
721 struct v4l2_subdev_format sink_fmt, source_fmt;
722 int rval;
723
724 rval = v4l2_subdev_link_validate_get_format(
725 link->source, &source_fmt);
726 if (rval < 0)
727 return 0;
728
729 rval = v4l2_subdev_link_validate_get_format(
730 link->sink, &sink_fmt);
731 if (rval < 0)
732 return 0;
733
734 sink = media_entity_to_v4l2_subdev(link->sink->entity);
735
736 rval = v4l2_subdev_call(sink, pad, link_validate, link,
737 &source_fmt, &sink_fmt);
738 if (rval != -ENOIOCTLCMD)
739 return rval;
740
741 return v4l2_subdev_link_validate_default(
742 sink, link, &source_fmt, &sink_fmt);
743 }
744 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
745
746 struct v4l2_subdev_pad_config *
v4l2_subdev_alloc_pad_config(struct v4l2_subdev * sd)747 v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd)
748 {
749 struct v4l2_subdev_pad_config *cfg;
750 int ret;
751
752 if (!sd->entity.num_pads)
753 return NULL;
754
755 cfg = kvmalloc_array(sd->entity.num_pads, sizeof(*cfg),
756 GFP_KERNEL | __GFP_ZERO);
757 if (!cfg)
758 return NULL;
759
760 ret = v4l2_subdev_call(sd, pad, init_cfg, cfg);
761 if (ret < 0 && ret != -ENOIOCTLCMD) {
762 kvfree(cfg);
763 return NULL;
764 }
765
766 return cfg;
767 }
768 EXPORT_SYMBOL_GPL(v4l2_subdev_alloc_pad_config);
769
v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config * cfg)770 void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg)
771 {
772 kvfree(cfg);
773 }
774 EXPORT_SYMBOL_GPL(v4l2_subdev_free_pad_config);
775 #endif /* CONFIG_MEDIA_CONTROLLER */
776
v4l2_subdev_init(struct v4l2_subdev * sd,const struct v4l2_subdev_ops * ops)777 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
778 {
779 INIT_LIST_HEAD(&sd->list);
780 BUG_ON(!ops);
781 sd->ops = ops;
782 sd->v4l2_dev = NULL;
783 sd->flags = 0;
784 sd->name[0] = '\0';
785 sd->grp_id = 0;
786 sd->dev_priv = NULL;
787 sd->host_priv = NULL;
788 #if defined(CONFIG_MEDIA_CONTROLLER)
789 sd->entity.name = sd->name;
790 sd->entity.obj_type = MEDIA_ENTITY_TYPE_V4L2_SUBDEV;
791 sd->entity.function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
792 #endif
793 }
794 EXPORT_SYMBOL(v4l2_subdev_init);
795
v4l2_subdev_notify_event(struct v4l2_subdev * sd,const struct v4l2_event * ev)796 void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
797 const struct v4l2_event *ev)
798 {
799 v4l2_event_queue(sd->devnode, ev);
800 v4l2_subdev_notify(sd, V4L2_DEVICE_NOTIFY_EVENT, (void *)ev);
801 }
802 EXPORT_SYMBOL_GPL(v4l2_subdev_notify_event);
803
