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)
subdev_fh_init(struct v4l2_subdev_fh * fh,struct v4l2_subdev * sd)27 static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
28 {
29 if (sd->entity.num_pads) {
30 fh->pad = v4l2_subdev_alloc_pad_config(sd);
31 if (fh->pad == NULL)
32 return -ENOMEM;
33 }
34
35 return 0;
36 }
37
subdev_fh_free(struct v4l2_subdev_fh * fh)38 static void subdev_fh_free(struct v4l2_subdev_fh *fh)
39 {
40 v4l2_subdev_free_pad_config(fh->pad);
41 fh->pad = NULL;
42 }
43
subdev_open(struct file * file)44 static int subdev_open(struct file *file)
45 {
46 struct video_device *vdev = video_devdata(file);
47 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
48 struct v4l2_subdev_fh *subdev_fh;
49 int ret;
50
51 subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
52 if (subdev_fh == NULL)
53 return -ENOMEM;
54
55 ret = subdev_fh_init(subdev_fh, sd);
56 if (ret) {
57 kfree(subdev_fh);
58 return ret;
59 }
60
61 v4l2_fh_init(&subdev_fh->vfh, vdev);
62 v4l2_fh_add(&subdev_fh->vfh);
63 file->private_data = &subdev_fh->vfh;
64 #if defined(CONFIG_MEDIA_CONTROLLER)
65 if (sd->v4l2_dev->mdev && sd->entity.graph_obj.mdev->dev) {
66 struct module *owner;
67
68 owner = sd->entity.graph_obj.mdev->dev->driver->owner;
69 if (!try_module_get(owner)) {
70 ret = -EBUSY;
71 goto err;
72 }
73 subdev_fh->owner = owner;
74 }
75 #endif
76
77 if (sd->internal_ops && sd->internal_ops->open) {
78 ret = sd->internal_ops->open(sd, subdev_fh);
79 if (ret < 0)
80 goto err;
81 }
82
83 return 0;
84
85 err:
86 module_put(subdev_fh->owner);
87 v4l2_fh_del(&subdev_fh->vfh);
88 v4l2_fh_exit(&subdev_fh->vfh);
89 subdev_fh_free(subdev_fh);
90 kfree(subdev_fh);
91
92 return ret;
93 }
94
subdev_close(struct file * file)95 static int subdev_close(struct file *file)
96 {
97 struct video_device *vdev = video_devdata(file);
98 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
99 struct v4l2_fh *vfh = file->private_data;
100 struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
101
102 if (sd->internal_ops && sd->internal_ops->close)
103 sd->internal_ops->close(sd, subdev_fh);
104 module_put(subdev_fh->owner);
105 v4l2_fh_del(vfh);
106 v4l2_fh_exit(vfh);
107 subdev_fh_free(subdev_fh);
108 kfree(subdev_fh);
109 file->private_data = NULL;
110
111 return 0;
112 }
113 #else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
subdev_open(struct file * file)114 static int subdev_open(struct file *file)
115 {
116 return -ENODEV;
117 }
118
subdev_close(struct file * file)119 static int subdev_close(struct file *file)
120 {
121 return -ENODEV;
122 }
123 #endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
124
check_which(u32 which)125 static inline int check_which(u32 which)
126 {
127 if (which != V4L2_SUBDEV_FORMAT_TRY &&
128 which != V4L2_SUBDEV_FORMAT_ACTIVE)
129 return -EINVAL;
130
131 return 0;
132 }
133
check_pad(struct v4l2_subdev * sd,u32 pad)134 static inline int check_pad(struct v4l2_subdev *sd, u32 pad)
135 {
136 #if defined(CONFIG_MEDIA_CONTROLLER)
137 if (sd->entity.num_pads) {
138 if (pad >= sd->entity.num_pads)
139 return -EINVAL;
140 return 0;
141 }
142 #endif
143 /* allow pad 0 on subdevices not registered as media entities */
144 if (pad > 0)
145 return -EINVAL;
146 return 0;
147 }
148
check_cfg(u32 which,struct v4l2_subdev_pad_config * cfg)149 static int check_cfg(u32 which, struct v4l2_subdev_pad_config *cfg)
150 {
151 if (which == V4L2_SUBDEV_FORMAT_TRY && !cfg)
152 return -EINVAL;
153
154 return 0;
155 }
156
check_format(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * format)157 static inline int check_format(struct v4l2_subdev *sd,
158 struct v4l2_subdev_pad_config *cfg,
159 struct v4l2_subdev_format *format)
160 {
161 if (!format)
162 return -EINVAL;
163
164 return check_which(format->which) ? : check_pad(sd, format->pad) ? :
165 check_cfg(format->which, cfg);
166 }
167
call_get_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * format)168 static int call_get_fmt(struct v4l2_subdev *sd,
169 struct v4l2_subdev_pad_config *cfg,
170 struct v4l2_subdev_format *format)
171 {
172 return check_format(sd, cfg, format) ? :
173 sd->ops->pad->get_fmt(sd, cfg, format);
174 }
175
call_set_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * format)176 static int call_set_fmt(struct v4l2_subdev *sd,
177 struct v4l2_subdev_pad_config *cfg,
178 struct v4l2_subdev_format *format)
179 {
180 return check_format(sd, cfg, format) ? :
181 sd->ops->pad->set_fmt(sd, cfg, format);
182 }
183
call_enum_mbus_code(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_mbus_code_enum * code)184 static int call_enum_mbus_code(struct v4l2_subdev *sd,
185 struct v4l2_subdev_pad_config *cfg,
186 struct v4l2_subdev_mbus_code_enum *code)
187 {
188 if (!code)
189 return -EINVAL;
190
191 return check_which(code->which) ? : check_pad(sd, code->pad) ? :
192 check_cfg(code->which, cfg) ? :
193 sd->ops->pad->enum_mbus_code(sd, cfg, code);
194 }
195
call_enum_frame_size(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_frame_size_enum * fse)196 static int call_enum_frame_size(struct v4l2_subdev *sd,
197 struct v4l2_subdev_pad_config *cfg,
198 struct v4l2_subdev_frame_size_enum *fse)
199 {
200 if (!fse)
201 return -EINVAL;
202
203 return check_which(fse->which) ? : check_pad(sd, fse->pad) ? :
204 check_cfg(fse->which, cfg) ? :
205 sd->ops->pad->enum_frame_size(sd, cfg, fse);
206 }
207
check_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_frame_interval * fi)208 static inline int check_frame_interval(struct v4l2_subdev *sd,
209 struct v4l2_subdev_frame_interval *fi)
210 {
211 if (!fi)
212 return -EINVAL;
213
214 return check_pad(sd, fi->pad);
215 }
216
call_g_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_frame_interval * fi)217 static int call_g_frame_interval(struct v4l2_subdev *sd,
218 struct v4l2_subdev_frame_interval *fi)
219 {
220 return check_frame_interval(sd, fi) ? :
221 sd->ops->video->g_frame_interval(sd, fi);
222 }
223
call_s_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_frame_interval * fi)224 static int call_s_frame_interval(struct v4l2_subdev *sd,
225 struct v4l2_subdev_frame_interval *fi)
226 {
227 return check_frame_interval(sd, fi) ? :
228 sd->ops->video->s_frame_interval(sd, fi);
229 }
230
call_enum_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_frame_interval_enum * fie)231 static int call_enum_frame_interval(struct v4l2_subdev *sd,
232 struct v4l2_subdev_pad_config *cfg,
233 struct v4l2_subdev_frame_interval_enum *fie)
234 {
235 if (!fie)
236 return -EINVAL;
237
238 return check_which(fie->which) ? : check_pad(sd, fie->pad) ? :
239 check_cfg(fie->which, cfg) ? :
240 sd->ops->pad->enum_frame_interval(sd, cfg, fie);
241 }
242
check_selection(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_selection * sel)243 static inline int check_selection(struct v4l2_subdev *sd,
244 struct v4l2_subdev_pad_config *cfg,
245 struct v4l2_subdev_selection *sel)
246 {
247 if (!sel)
248 return -EINVAL;
249
250 return check_which(sel->which) ? : check_pad(sd, sel->pad) ? :
251 check_cfg(sel->which, cfg);
252 }
253
call_get_selection(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_selection * sel)254 static int call_get_selection(struct v4l2_subdev *sd,
255 struct v4l2_subdev_pad_config *cfg,
256 struct v4l2_subdev_selection *sel)
257 {
258 return check_selection(sd, cfg, sel) ? :
259 sd->ops->pad->get_selection(sd, cfg, sel);
260 }
261
call_set_selection(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_selection * sel)262 static int call_set_selection(struct v4l2_subdev *sd,
263 struct v4l2_subdev_pad_config *cfg,
264 struct v4l2_subdev_selection *sel)
265 {
266 return check_selection(sd, cfg, sel) ? :
267 sd->ops->pad->set_selection(sd, cfg, sel);
268 }
269
check_edid(struct v4l2_subdev * sd,struct v4l2_subdev_edid * edid)270 static inline int check_edid(struct v4l2_subdev *sd,
271 struct v4l2_subdev_edid *edid)
272 {
273 if (!edid)
274 return -EINVAL;
275
276 if (edid->blocks && edid->edid == NULL)
277 return -EINVAL;
278
279 return check_pad(sd, edid->pad);
280 }
281
call_get_edid(struct v4l2_subdev * sd,struct v4l2_subdev_edid * edid)282 static int call_get_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
283 {
284 return check_edid(sd, edid) ? : sd->ops->pad->get_edid(sd, edid);
285 }
286
call_set_edid(struct v4l2_subdev * sd,struct v4l2_subdev_edid * edid)287 static int call_set_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
288 {
289 return check_edid(sd, edid) ? : sd->ops->pad->set_edid(sd, edid);
290 }
291
call_dv_timings_cap(struct v4l2_subdev * sd,struct v4l2_dv_timings_cap * cap)292 static int call_dv_timings_cap(struct v4l2_subdev *sd,
293 struct v4l2_dv_timings_cap *cap)
294 {
295 if (!cap)
296 return -EINVAL;
297
298 return check_pad(sd, cap->pad) ? :
299 sd->ops->pad->dv_timings_cap(sd, cap);
300 }
301
call_enum_dv_timings(struct v4l2_subdev * sd,struct v4l2_enum_dv_timings * dvt)302 static int call_enum_dv_timings(struct v4l2_subdev *sd,
303 struct v4l2_enum_dv_timings *dvt)
304 {
305 if (!dvt)
306 return -EINVAL;
307
308 return check_pad(sd, dvt->pad) ? :
309 sd->ops->pad->enum_dv_timings(sd, dvt);
310 }
311
call_get_mbus_config(struct v4l2_subdev * sd,unsigned int pad,struct v4l2_mbus_config * config)312 static int call_get_mbus_config(struct v4l2_subdev *sd, unsigned int pad,
313 struct v4l2_mbus_config *config)
314 {
315 return check_pad(sd, pad) ? :
316 sd->ops->pad->get_mbus_config(sd, pad, config);
317 }
318
call_set_mbus_config(struct v4l2_subdev * sd,unsigned int pad,struct v4l2_mbus_config * config)319 static int call_set_mbus_config(struct v4l2_subdev *sd, unsigned int pad,
320 struct v4l2_mbus_config *config)
321 {
322 return check_pad(sd, pad) ? :
323 sd->ops->pad->get_mbus_config(sd, pad, config);
324 }
325
326 static const struct v4l2_subdev_pad_ops v4l2_subdev_call_pad_wrappers = {
327 .get_fmt = call_get_fmt,
328 .set_fmt = call_set_fmt,
329 .enum_mbus_code = call_enum_mbus_code,
330 .enum_frame_size = call_enum_frame_size,
331 .enum_frame_interval = call_enum_frame_interval,
332 .get_selection = call_get_selection,
333 .set_selection = call_set_selection,
334 .get_edid = call_get_edid,
335 .set_edid = call_set_edid,
336 .dv_timings_cap = call_dv_timings_cap,
337 .enum_dv_timings = call_enum_dv_timings,
338 .get_mbus_config = call_get_mbus_config,
339 .set_mbus_config = call_set_mbus_config,
340 };
341
342 static const struct v4l2_subdev_video_ops v4l2_subdev_call_video_wrappers = {
343 .g_frame_interval = call_g_frame_interval,
344 .s_frame_interval = call_s_frame_interval,
345 };
346
347 const struct v4l2_subdev_ops v4l2_subdev_call_wrappers = {
348 .pad = &v4l2_subdev_call_pad_wrappers,
349 .video = &v4l2_subdev_call_video_wrappers,
350 };
351 EXPORT_SYMBOL(v4l2_subdev_call_wrappers);
352
353 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
subdev_do_ioctl(struct file * file,unsigned int cmd,void * arg)354 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
355 {
356 struct video_device *vdev = video_devdata(file);
357 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
358 struct v4l2_fh *vfh = file->private_data;
359 struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
360 bool ro_subdev = test_bit(V4L2_FL_SUBDEV_RO_DEVNODE, &vdev->flags);
361 int rval;
362
363 switch (cmd) {
364 case VIDIOC_SUBDEV_QUERYCAP: {
365 struct v4l2_subdev_capability *cap = arg;
366
367 memset(cap->reserved, 0, sizeof(cap->reserved));
368 cap->version = LINUX_VERSION_CODE;
369 cap->capabilities = ro_subdev ? V4L2_SUBDEV_CAP_RO_SUBDEV : 0;
370
371 return 0;
372 }
373
374 case VIDIOC_QUERYCTRL:
375 /*
376 * TODO: this really should be folded into v4l2_queryctrl (this
377 * currently returns -EINVAL for NULL control handlers).
378 * However, v4l2_queryctrl() is still called directly by
379 * drivers as well and until that has been addressed I believe
380 * it is safer to do the check here. The same is true for the
381 * other control ioctls below.
382 */
383 if (!vfh->ctrl_handler)
384 return -ENOTTY;
385 return v4l2_queryctrl(vfh->ctrl_handler, arg);
386
387 case VIDIOC_QUERY_EXT_CTRL:
388 if (!vfh->ctrl_handler)
389 return -ENOTTY;
390 return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg);
391
392 case VIDIOC_QUERYMENU:
393 if (!vfh->ctrl_handler)
394 return -ENOTTY;
395 return v4l2_querymenu(vfh->ctrl_handler, arg);
396
397 case VIDIOC_G_CTRL:
398 if (!vfh->ctrl_handler)
399 return -ENOTTY;
400 return v4l2_g_ctrl(vfh->ctrl_handler, arg);
401
402 case VIDIOC_S_CTRL:
403 if (!vfh->ctrl_handler)
404 return -ENOTTY;
405 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
406
407 case VIDIOC_G_EXT_CTRLS:
408 if (!vfh->ctrl_handler)
409 return -ENOTTY;
410 return v4l2_g_ext_ctrls(vfh->ctrl_handler,
411 vdev, sd->v4l2_dev->mdev, arg);
412
413 case VIDIOC_S_EXT_CTRLS:
414 if (!vfh->ctrl_handler)
415 return -ENOTTY;
416 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler,
417 vdev, sd->v4l2_dev->mdev, arg);
418
419 case VIDIOC_TRY_EXT_CTRLS:
420 if (!vfh->ctrl_handler)
421 return -ENOTTY;
422 return v4l2_try_ext_ctrls(vfh->ctrl_handler,
423 vdev, sd->v4l2_dev->mdev, arg);
424
425 case VIDIOC_DQEVENT:
426 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
427 return -ENOIOCTLCMD;
428
429 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
430
431 #ifdef CONFIG_COMPAT_32BIT_TIME
432 case VIDIOC_DQEVENT_TIME32: {
433 struct v4l2_event_time32 *ev32 = arg;
434 struct v4l2_event ev = { };
435
436 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
437 return -ENOIOCTLCMD;
438
439 rval = v4l2_event_dequeue(vfh, &ev, file->f_flags & O_NONBLOCK);
440
441 *ev32 = (struct v4l2_event_time32) {
442 .type = ev.type,
443 .pending = ev.pending,
444 .sequence = ev.sequence,
445 .timestamp.tv_sec = ev.timestamp.tv_sec,
446 .timestamp.tv_nsec = ev.timestamp.tv_nsec,
447 .id = ev.id,
448 };
449
450 memcpy(&ev32->u, &ev.u, sizeof(ev.u));
451 memcpy(&ev32->reserved, &ev.reserved, sizeof(ev.reserved));
452
453 return rval;
454 }
455 #endif
456 case VIDIOC_SUBSCRIBE_EVENT:
457 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
458
459 case VIDIOC_UNSUBSCRIBE_EVENT:
460 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
461
462 #ifdef CONFIG_VIDEO_ADV_DEBUG
463 case VIDIOC_DBG_G_REGISTER:
464 {
465 struct v4l2_dbg_register *p = arg;
466
467 if (!capable(CAP_SYS_ADMIN))
468 return -EPERM;
469 return v4l2_subdev_call(sd, core, g_register, p);
470 }
471 case VIDIOC_DBG_S_REGISTER:
472 {
473 struct v4l2_dbg_register *p = arg;
474
475 if (!capable(CAP_SYS_ADMIN))
476 return -EPERM;
477 return v4l2_subdev_call(sd, core, s_register, p);
478 }
479 case VIDIOC_DBG_G_CHIP_INFO:
480 {
481 struct v4l2_dbg_chip_info *p = arg;
482
483 if (p->match.type != V4L2_CHIP_MATCH_SUBDEV || p->match.addr)
484 return -EINVAL;
485 if (sd->ops->core && sd->ops->core->s_register)
486 p->flags |= V4L2_CHIP_FL_WRITABLE;
487 if (sd->ops->core && sd->ops->core->g_register)
488 p->flags |= V4L2_CHIP_FL_READABLE;
489 strscpy(p->name, sd->name, sizeof(p->name));
490 return 0;
491 }
492 #endif
493
494 case VIDIOC_LOG_STATUS: {
495 int ret;
496
497 pr_info("%s: ================= START STATUS =================\n",
498 sd->name);
499 ret = v4l2_subdev_call(sd, core, log_status);
500 pr_info("%s: ================== END STATUS ==================\n",
501 sd->name);
502 return ret;
503 }
504
505 case VIDIOC_SUBDEV_G_FMT: {
506 struct v4l2_subdev_format *format = arg;
507
508 memset(format->reserved, 0, sizeof(format->reserved));
509 memset(format->format.reserved, 0, sizeof(format->format.reserved));
510 return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh->pad, format);
511 }
512
513 case VIDIOC_SUBDEV_S_FMT: {
514 struct v4l2_subdev_format *format = arg;
515
516 if (format->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
517 return -EPERM;
518
519 memset(format->reserved, 0, sizeof(format->reserved));
520 memset(format->format.reserved, 0, sizeof(format->format.reserved));
521 return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh->pad, format);
522 }
523
524 case VIDIOC_SUBDEV_G_CROP: {
525 struct v4l2_subdev_crop *crop = arg;
526 struct v4l2_subdev_selection sel;
527
528 memset(crop->reserved, 0, sizeof(crop->reserved));
529 memset(&sel, 0, sizeof(sel));
530 sel.which = crop->which;
531 sel.pad = crop->pad;
532 sel.target = V4L2_SEL_TGT_CROP;
533
534 rval = v4l2_subdev_call(
535 sd, pad, get_selection, subdev_fh->pad, &sel);
536
537 crop->rect = sel.r;
538
539 return rval;
540 }
541
542 case VIDIOC_SUBDEV_S_CROP: {
543 struct v4l2_subdev_crop *crop = arg;
544 struct v4l2_subdev_selection sel;
545
546 if (crop->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
547 return -EPERM;
548
549 memset(crop->reserved, 0, sizeof(crop->reserved));
550 memset(&sel, 0, sizeof(sel));
551 sel.which = crop->which;
552 sel.pad = crop->pad;
553 sel.target = V4L2_SEL_TGT_CROP;
554 sel.r = crop->rect;
555
556 rval = v4l2_subdev_call(
557 sd, pad, set_selection, subdev_fh->pad, &sel);
558
559 crop->rect = sel.r;
560
561 return rval;
562 }
563
564 case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
565 struct v4l2_subdev_mbus_code_enum *code = arg;
566
567 memset(code->reserved, 0, sizeof(code->reserved));
568 return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh->pad,
569 code);
570 }
571
572 case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
573 struct v4l2_subdev_frame_size_enum *fse = arg;
574
575 memset(fse->reserved, 0, sizeof(fse->reserved));
576 return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh->pad,
577 fse);
578 }
579
580 case VIDIOC_SUBDEV_G_FRAME_INTERVAL: {
581 struct v4l2_subdev_frame_interval *fi = arg;
582
583 memset(fi->reserved, 0, sizeof(fi->reserved));
584 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
585 }
586
587 case VIDIOC_SUBDEV_S_FRAME_INTERVAL: {
588 struct v4l2_subdev_frame_interval *fi = arg;
589
590 if (ro_subdev)
591 return -EPERM;
592
593 memset(fi->reserved, 0, sizeof(fi->reserved));
594 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
595 }
596
597 case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
598 struct v4l2_subdev_frame_interval_enum *fie = arg;
599
600 memset(fie->reserved, 0, sizeof(fie->reserved));
601 return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh->pad,
602 fie);
603 }
604
605 case VIDIOC_SUBDEV_G_SELECTION: {
606 struct v4l2_subdev_selection *sel = arg;
607
608 memset(sel->reserved, 0, sizeof(sel->reserved));
609 return v4l2_subdev_call(
610 sd, pad, get_selection, subdev_fh->pad, sel);
611 }
612
613 case VIDIOC_SUBDEV_S_SELECTION: {
614 struct v4l2_subdev_selection *sel = arg;
615
616 if (sel->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
617 return -EPERM;
618
619 memset(sel->reserved, 0, sizeof(sel->reserved));
620 return v4l2_subdev_call(
621 sd, pad, set_selection, subdev_fh->pad, sel);
622 }
623
624 case VIDIOC_G_EDID: {
625 struct v4l2_subdev_edid *edid = arg;
626
627 return v4l2_subdev_call(sd, pad, get_edid, edid);
628 }
629
630 case VIDIOC_S_EDID: {
631 struct v4l2_subdev_edid *edid = arg;
632
633 return v4l2_subdev_call(sd, pad, set_edid, edid);
634 }
635
636 case VIDIOC_SUBDEV_DV_TIMINGS_CAP: {
637 struct v4l2_dv_timings_cap *cap = arg;
638
639 return v4l2_subdev_call(sd, pad, dv_timings_cap, cap);
640 }
641
642 case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: {
643 struct v4l2_enum_dv_timings *dvt = arg;
644
645 return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt);
646 }
647
648 case VIDIOC_SUBDEV_QUERY_DV_TIMINGS:
649 return v4l2_subdev_call(sd, video, query_dv_timings, arg);
650
651 case VIDIOC_SUBDEV_G_DV_TIMINGS:
652 return v4l2_subdev_call(sd, video, g_dv_timings, arg);
653
654 case VIDIOC_SUBDEV_S_DV_TIMINGS:
655 if (ro_subdev)
656 return -EPERM;
657
658 return v4l2_subdev_call(sd, video, s_dv_timings, arg);
659
660 case VIDIOC_SUBDEV_G_STD:
661 return v4l2_subdev_call(sd, video, g_std, arg);
662
663 case VIDIOC_SUBDEV_S_STD: {
664 v4l2_std_id *std = arg;
665
666 if (ro_subdev)
667 return -EPERM;
668
669 return v4l2_subdev_call(sd, video, s_std, *std);
670 }
671
672 case VIDIOC_SUBDEV_ENUMSTD: {
673 struct v4l2_standard *p = arg;
674 v4l2_std_id id;
675
676 if (v4l2_subdev_call(sd, video, g_tvnorms, &id))
677 return -EINVAL;
678
679 return v4l_video_std_enumstd(p, id);
680 }
681
682 case VIDIOC_SUBDEV_QUERYSTD:
683 return v4l2_subdev_call(sd, video, querystd, arg);
684
685 default:
686 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
687 }
688
689 return 0;
690 }
691
subdev_do_ioctl_lock(struct file * file,unsigned int cmd,void * arg)692 static long subdev_do_ioctl_lock(struct file *file, unsigned int cmd, void *arg)
693 {
694 struct video_device *vdev = video_devdata(file);
695 struct mutex *lock = vdev->lock;
696 long ret = -ENODEV;
697
698 if (lock && mutex_lock_interruptible(lock))
699 return -ERESTARTSYS;
700 if (video_is_registered(vdev))
701 ret = subdev_do_ioctl(file, cmd, arg);
702 if (lock)
703 mutex_unlock(lock);
704 return ret;
705 }
706
subdev_ioctl(struct file * file,unsigned int cmd,unsigned long arg)707 static long subdev_ioctl(struct file *file, unsigned int cmd,
708 unsigned long arg)
709 {
710 return video_usercopy(file, cmd, arg, subdev_do_ioctl_lock);
711 }
712
713 #ifdef CONFIG_COMPAT
subdev_compat_ioctl32(struct file * file,unsigned int cmd,unsigned long arg)714 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
715 unsigned long arg)
716 {
717 struct video_device *vdev = video_devdata(file);
718 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
719
720 return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg);
721 }
722 #endif
723
724 #else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
subdev_ioctl(struct file * file,unsigned int cmd,unsigned long arg)725 static long subdev_ioctl(struct file *file, unsigned int cmd,
726 unsigned long arg)
727 {
728 return -ENODEV;
729 }
730
731 #ifdef CONFIG_COMPAT
subdev_compat_ioctl32(struct file * file,unsigned int cmd,unsigned long arg)732 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
733 unsigned long arg)
734 {
735 return -ENODEV;
736 }
737 #endif
738 #endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
739
subdev_poll(struct file * file,poll_table * wait)740 static __poll_t subdev_poll(struct file *file, poll_table *wait)
741 {
742 struct video_device *vdev = video_devdata(file);
743 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
744 struct v4l2_fh *fh = file->private_data;
745
746 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
747 return EPOLLERR;
748
749 poll_wait(file, &fh->wait, wait);
750
751 if (v4l2_event_pending(fh))
752 return EPOLLPRI;
753
754 return 0;
755 }
756
757 const struct v4l2_file_operations v4l2_subdev_fops = {
758 .owner = THIS_MODULE,
759 .open = subdev_open,
760 .unlocked_ioctl = subdev_ioctl,
761 #ifdef CONFIG_COMPAT
762 .compat_ioctl32 = subdev_compat_ioctl32,
763 #endif
764 .release = subdev_close,
765 .poll = subdev_poll,
766 };
767
768 #ifdef CONFIG_MEDIA_CONTROLLER
769
v4l2_subdev_get_fwnode_pad_1_to_1(struct media_entity * entity,struct fwnode_endpoint * endpoint)770 int v4l2_subdev_get_fwnode_pad_1_to_1(struct media_entity *entity,
771 struct fwnode_endpoint *endpoint)
772 {
773 struct fwnode_handle *fwnode;
774 struct v4l2_subdev *sd;
775
776 if (!is_media_entity_v4l2_subdev(entity))
777 return -EINVAL;
778
779 sd = media_entity_to_v4l2_subdev(entity);
780
781 fwnode = fwnode_graph_get_port_parent(endpoint->local_fwnode);
782 fwnode_handle_put(fwnode);
783
784 if (dev_fwnode(sd->dev) == fwnode)
785 return endpoint->port;
786
787 return -ENXIO;
788 }
789 EXPORT_SYMBOL_GPL(v4l2_subdev_get_fwnode_pad_1_to_1);
790
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)791 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
792 struct media_link *link,
793 struct v4l2_subdev_format *source_fmt,
794 struct v4l2_subdev_format *sink_fmt)
795 {
796 bool pass = true;
797
798 /* The width, height and code must match. */
799 if (source_fmt->format.width != sink_fmt->format.width) {
800 dev_dbg(sd->entity.graph_obj.mdev->dev,
801 "%s: width does not match (source %u, sink %u)\n",
802 __func__,
803 source_fmt->format.width, sink_fmt->format.width);
804 pass = false;
805 }
806
807 if (source_fmt->format.height != sink_fmt->format.height) {
808 dev_dbg(sd->entity.graph_obj.mdev->dev,
809 "%s: height does not match (source %u, sink %u)\n",
810 __func__,
811 source_fmt->format.height, sink_fmt->format.height);
812 pass = false;
813 }
814
815 if (source_fmt->format.code != sink_fmt->format.code) {
816 dev_dbg(sd->entity.graph_obj.mdev->dev,
817 "%s: media bus code does not match (source 0x%8.8x, sink 0x%8.8x)\n",
818 __func__,
819 source_fmt->format.code, sink_fmt->format.code);
820 pass = false;
821 }
822
823 /* The field order must match, or the sink field order must be NONE
824 * to support interlaced hardware connected to bridges that support
825 * progressive formats only.
826 */
827 if (source_fmt->format.field != sink_fmt->format.field &&
828 sink_fmt->format.field != V4L2_FIELD_NONE) {
829 dev_dbg(sd->entity.graph_obj.mdev->dev,
830 "%s: field does not match (source %u, sink %u)\n",
831 __func__,
832 source_fmt->format.field, sink_fmt->format.field);
833 pass = false;
834 }
835
836 if (pass)
837 return 0;
838
839 dev_dbg(sd->entity.graph_obj.mdev->dev,
840 "%s: link was \"%s\":%u -> \"%s\":%u\n", __func__,
841 link->source->entity->name, link->source->index,
842 link->sink->entity->name, link->sink->index);
843
844 return -EPIPE;
845 }
846 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);
847
848 static int
v4l2_subdev_link_validate_get_format(struct media_pad * pad,struct v4l2_subdev_format * fmt)849 v4l2_subdev_link_validate_get_format(struct media_pad *pad,
850 struct v4l2_subdev_format *fmt)
851 {
852 if (is_media_entity_v4l2_subdev(pad->entity)) {
853 struct v4l2_subdev *sd =
854 media_entity_to_v4l2_subdev(pad->entity);
855
856 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
857 fmt->pad = pad->index;
858 return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
859 }
860
861 WARN(pad->entity->function != MEDIA_ENT_F_IO_V4L,
862 "Driver bug! Wrong media entity type 0x%08x, entity %s\n",
863 pad->entity->function, pad->entity->name);
864
865 return -EINVAL;
866 }
867
v4l2_subdev_link_validate(struct media_link * link)868 int v4l2_subdev_link_validate(struct media_link *link)
869 {
870 struct v4l2_subdev *sink;
871 struct v4l2_subdev_format sink_fmt, source_fmt;
872 int rval;
873
874 rval = v4l2_subdev_link_validate_get_format(
875 link->source, &source_fmt);
876 if (rval < 0)
877 return 0;
878
879 rval = v4l2_subdev_link_validate_get_format(
880 link->sink, &sink_fmt);
881 if (rval < 0)
882 return 0;
883
884 sink = media_entity_to_v4l2_subdev(link->sink->entity);
885
886 rval = v4l2_subdev_call(sink, pad, link_validate, link,
887 &source_fmt, &sink_fmt);
888 if (rval != -ENOIOCTLCMD)
889 return rval;
890
891 return v4l2_subdev_link_validate_default(
892 sink, link, &source_fmt, &sink_fmt);
893 }
894 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
895
896 struct v4l2_subdev_pad_config *
v4l2_subdev_alloc_pad_config(struct v4l2_subdev * sd)897 v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd)
898 {
899 struct v4l2_subdev_pad_config *cfg;
900 int ret;
901
902 if (!sd->entity.num_pads)
903 return NULL;
904
905 cfg = kvmalloc_array(sd->entity.num_pads, sizeof(*cfg),
906 GFP_KERNEL | __GFP_ZERO);
907 if (!cfg)
908 return NULL;
909
910 ret = v4l2_subdev_call(sd, pad, init_cfg, cfg);
911 if (ret < 0 && ret != -ENOIOCTLCMD) {
912 kvfree(cfg);
913 return NULL;
914 }
915
916 return cfg;
917 }
918 EXPORT_SYMBOL_GPL(v4l2_subdev_alloc_pad_config);
919
v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config * cfg)920 void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg)
921 {
922 kvfree(cfg);
923 }
924 EXPORT_SYMBOL_GPL(v4l2_subdev_free_pad_config);
925 #endif /* CONFIG_MEDIA_CONTROLLER */
926
v4l2_subdev_init(struct v4l2_subdev * sd,const struct v4l2_subdev_ops * ops)927 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
928 {
929 INIT_LIST_HEAD(&sd->list);
930 BUG_ON(!ops);
931 sd->ops = ops;
932 sd->v4l2_dev = NULL;
933 sd->flags = 0;
934 sd->name[0] = '\0';
935 sd->grp_id = 0;
936 sd->dev_priv = NULL;
937 sd->host_priv = NULL;
938 #if defined(CONFIG_MEDIA_CONTROLLER)
939 sd->entity.name = sd->name;
940 sd->entity.obj_type = MEDIA_ENTITY_TYPE_V4L2_SUBDEV;
941 sd->entity.function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
942 #endif
943 }
944 EXPORT_SYMBOL(v4l2_subdev_init);
945
v4l2_subdev_notify_event(struct v4l2_subdev * sd,const struct v4l2_event * ev)946 void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
947 const struct v4l2_event *ev)
948 {
949 v4l2_event_queue(sd->devnode, ev);
950 v4l2_subdev_notify(sd, V4L2_DEVICE_NOTIFY_EVENT, (void *)ev);
951 }
952 EXPORT_SYMBOL_GPL(v4l2_subdev_notify_event);
953