1 /*
2  * V4L2 sub-device
3  *
4  * Copyright (C) 2010 Nokia Corporation
5  *
6  * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
7  *	    Sakari Ailus <sakari.ailus@iki.fi>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21  */
22 
23 #include <linux/ioctl.h>
24 #include <linux/slab.h>
25 #include <linux/types.h>
26 #include <linux/videodev2.h>
27 #include <linux/export.h>
28 
29 #include <media/v4l2-ctrls.h>
30 #include <media/v4l2-device.h>
31 #include <media/v4l2-ioctl.h>
32 #include <media/v4l2-fh.h>
33 #include <media/v4l2-event.h>
34 
35 static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
36 {
37 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
38 	fh->pad = kzalloc(sizeof(*fh->pad) * sd->entity.num_pads, GFP_KERNEL);
39 	if (fh->pad == NULL)
40 		return -ENOMEM;
41 #endif
42 	return 0;
43 }
44 
45 static void subdev_fh_free(struct v4l2_subdev_fh *fh)
46 {
47 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
48 	kfree(fh->pad);
49 	fh->pad = NULL;
50 #endif
51 }
52 
53 static int subdev_open(struct file *file)
54 {
55 	struct video_device *vdev = video_devdata(file);
56 	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
57 	struct v4l2_subdev_fh *subdev_fh;
58 #if defined(CONFIG_MEDIA_CONTROLLER)
59 	struct media_entity *entity = NULL;
60 #endif
61 	int ret;
62 
63 	subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
64 	if (subdev_fh == NULL)
65 		return -ENOMEM;
66 
67 	ret = subdev_fh_init(subdev_fh, sd);
68 	if (ret) {
69 		kfree(subdev_fh);
70 		return ret;
71 	}
72 
73 	v4l2_fh_init(&subdev_fh->vfh, vdev);
74 	v4l2_fh_add(&subdev_fh->vfh);
75 	file->private_data = &subdev_fh->vfh;
76 #if defined(CONFIG_MEDIA_CONTROLLER)
77 	if (sd->v4l2_dev->mdev) {
78 		entity = media_entity_get(&sd->entity);
79 		if (!entity) {
80 			ret = -EBUSY;
81 			goto err;
82 		}
83 	}
84 #endif
85 
86 	if (sd->internal_ops && sd->internal_ops->open) {
87 		ret = sd->internal_ops->open(sd, subdev_fh);
88 		if (ret < 0)
89 			goto err;
90 	}
91 
92 	return 0;
93 
94 err:
95 #if defined(CONFIG_MEDIA_CONTROLLER)
96 	media_entity_put(entity);
97 #endif
98 	v4l2_fh_del(&subdev_fh->vfh);
99 	v4l2_fh_exit(&subdev_fh->vfh);
100 	subdev_fh_free(subdev_fh);
101 	kfree(subdev_fh);
102 
103 	return ret;
104 }
105 
106 static int subdev_close(struct file *file)
107 {
108 	struct video_device *vdev = video_devdata(file);
109 	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
110 	struct v4l2_fh *vfh = file->private_data;
111 	struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
112 
113 	if (sd->internal_ops && sd->internal_ops->close)
114 		sd->internal_ops->close(sd, subdev_fh);
115 #if defined(CONFIG_MEDIA_CONTROLLER)
116 	if (sd->v4l2_dev->mdev)
117 		media_entity_put(&sd->entity);
118 #endif
119 	v4l2_fh_del(vfh);
120 	v4l2_fh_exit(vfh);
121 	subdev_fh_free(subdev_fh);
122 	kfree(subdev_fh);
123 	file->private_data = NULL;
124 
125 	return 0;
126 }
127 
128 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
129 static int check_format(struct v4l2_subdev *sd,
130 			struct v4l2_subdev_format *format)
131 {
132 	if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
133 	    format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
134 		return -EINVAL;
135 
136 	if (format->pad >= sd->entity.num_pads)
137 		return -EINVAL;
138 
139 	return 0;
140 }
141 
142 static int check_crop(struct v4l2_subdev *sd, struct v4l2_subdev_crop *crop)
143 {
144 	if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
145 	    crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
146 		return -EINVAL;
147 
148 	if (crop->pad >= sd->entity.num_pads)
149 		return -EINVAL;
150 
151 	return 0;
152 }
153 
154 static int check_selection(struct v4l2_subdev *sd,
155 			   struct v4l2_subdev_selection *sel)
156 {
157 	if (sel->which != V4L2_SUBDEV_FORMAT_TRY &&
158 	    sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
159 		return -EINVAL;
160 
161 	if (sel->pad >= sd->entity.num_pads)
162 		return -EINVAL;
163 
164 	return 0;
165 }
166 
167 static int check_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
168 {
169 	if (edid->pad >= sd->entity.num_pads)
170 		return -EINVAL;
171 
172 	if (edid->blocks && edid->edid == NULL)
173 		return -EINVAL;
174 
175 	return 0;
176 }
177 #endif
178 
179 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
180 {
181 	struct video_device *vdev = video_devdata(file);
182 	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
183 	struct v4l2_fh *vfh = file->private_data;
184 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
185 	struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
186 	int rval;
187 #endif
188 
189 	switch (cmd) {
190 	case VIDIOC_QUERYCTRL:
191 		return v4l2_queryctrl(vfh->ctrl_handler, arg);
192 
193 	case VIDIOC_QUERY_EXT_CTRL:
194 		return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg);
195 
196 	case VIDIOC_QUERYMENU:
197 		return v4l2_querymenu(vfh->ctrl_handler, arg);
198 
199 	case VIDIOC_G_CTRL:
200 		return v4l2_g_ctrl(vfh->ctrl_handler, arg);
201 
202 	case VIDIOC_S_CTRL:
203 		return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
204 
205 	case VIDIOC_G_EXT_CTRLS:
206 		return v4l2_g_ext_ctrls(vfh->ctrl_handler, arg);
207 
208 	case VIDIOC_S_EXT_CTRLS:
209 		return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, arg);
210 
211 	case VIDIOC_TRY_EXT_CTRLS:
212 		return v4l2_try_ext_ctrls(vfh->ctrl_handler, arg);
213 
214 	case VIDIOC_DQEVENT:
215 		if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
216 			return -ENOIOCTLCMD;
217 
218 		return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
219 
220 	case VIDIOC_SUBSCRIBE_EVENT:
221 		return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
222 
223 	case VIDIOC_UNSUBSCRIBE_EVENT:
224 		return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
225 
226 #ifdef CONFIG_VIDEO_ADV_DEBUG
227 	case VIDIOC_DBG_G_REGISTER:
228 	{
229 		struct v4l2_dbg_register *p = arg;
230 
231 		if (!capable(CAP_SYS_ADMIN))
232 			return -EPERM;
233 		return v4l2_subdev_call(sd, core, g_register, p);
234 	}
235 	case VIDIOC_DBG_S_REGISTER:
236 	{
237 		struct v4l2_dbg_register *p = arg;
238 
239 		if (!capable(CAP_SYS_ADMIN))
240 			return -EPERM;
241 		return v4l2_subdev_call(sd, core, s_register, p);
242 	}
243 #endif
244 
245 	case VIDIOC_LOG_STATUS: {
246 		int ret;
247 
248 		pr_info("%s: =================  START STATUS  =================\n",
249 			sd->name);
250 		ret = v4l2_subdev_call(sd, core, log_status);
251 		pr_info("%s: ==================  END STATUS  ==================\n",
252 			sd->name);
253 		return ret;
254 	}
255 
256 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
257 	case VIDIOC_SUBDEV_G_FMT: {
258 		struct v4l2_subdev_format *format = arg;
259 
260 		rval = check_format(sd, format);
261 		if (rval)
262 			return rval;
263 
264 		return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh->pad, format);
265 	}
266 
267 	case VIDIOC_SUBDEV_S_FMT: {
268 		struct v4l2_subdev_format *format = arg;
269 
270 		rval = check_format(sd, format);
271 		if (rval)
272 			return rval;
273 
274 		return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh->pad, format);
275 	}
276 
277 	case VIDIOC_SUBDEV_G_CROP: {
278 		struct v4l2_subdev_crop *crop = arg;
279 		struct v4l2_subdev_selection sel;
280 
281 		rval = check_crop(sd, crop);
282 		if (rval)
283 			return rval;
284 
285 		memset(&sel, 0, sizeof(sel));
286 		sel.which = crop->which;
287 		sel.pad = crop->pad;
288 		sel.target = V4L2_SEL_TGT_CROP;
289 
290 		rval = v4l2_subdev_call(
291 			sd, pad, get_selection, subdev_fh->pad, &sel);
292 
293 		crop->rect = sel.r;
294 
295 		return rval;
296 	}
297 
298 	case VIDIOC_SUBDEV_S_CROP: {
299 		struct v4l2_subdev_crop *crop = arg;
300 		struct v4l2_subdev_selection sel;
301 
302 		rval = check_crop(sd, crop);
303 		if (rval)
304 			return rval;
305 
306 		memset(&sel, 0, sizeof(sel));
307 		sel.which = crop->which;
308 		sel.pad = crop->pad;
309 		sel.target = V4L2_SEL_TGT_CROP;
310 		sel.r = crop->rect;
311 
312 		rval = v4l2_subdev_call(
313 			sd, pad, set_selection, subdev_fh->pad, &sel);
314 
315 		crop->rect = sel.r;
316 
317 		return rval;
318 	}
319 
320 	case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
321 		struct v4l2_subdev_mbus_code_enum *code = arg;
322 
323 		if (code->which != V4L2_SUBDEV_FORMAT_TRY &&
324 		    code->which != V4L2_SUBDEV_FORMAT_ACTIVE)
325 			return -EINVAL;
326 
327 		if (code->pad >= sd->entity.num_pads)
328 			return -EINVAL;
329 
330 		return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh->pad,
331 					code);
332 	}
333 
334 	case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
335 		struct v4l2_subdev_frame_size_enum *fse = arg;
336 
337 		if (fse->which != V4L2_SUBDEV_FORMAT_TRY &&
338 		    fse->which != V4L2_SUBDEV_FORMAT_ACTIVE)
339 			return -EINVAL;
340 
341 		if (fse->pad >= sd->entity.num_pads)
342 			return -EINVAL;
343 
344 		return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh->pad,
345 					fse);
346 	}
347 
348 	case VIDIOC_SUBDEV_G_FRAME_INTERVAL: {
349 		struct v4l2_subdev_frame_interval *fi = arg;
350 
351 		if (fi->pad >= sd->entity.num_pads)
352 			return -EINVAL;
353 
354 		return v4l2_subdev_call(sd, video, g_frame_interval, arg);
355 	}
356 
357 	case VIDIOC_SUBDEV_S_FRAME_INTERVAL: {
358 		struct v4l2_subdev_frame_interval *fi = arg;
359 
360 		if (fi->pad >= sd->entity.num_pads)
361 			return -EINVAL;
362 
363 		return v4l2_subdev_call(sd, video, s_frame_interval, arg);
364 	}
365 
366 	case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
367 		struct v4l2_subdev_frame_interval_enum *fie = arg;
368 
369 		if (fie->which != V4L2_SUBDEV_FORMAT_TRY &&
370 		    fie->which != V4L2_SUBDEV_FORMAT_ACTIVE)
371 			return -EINVAL;
372 
373 		if (fie->pad >= sd->entity.num_pads)
374 			return -EINVAL;
375 
376 		return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh->pad,
377 					fie);
378 	}
379 
380 	case VIDIOC_SUBDEV_G_SELECTION: {
381 		struct v4l2_subdev_selection *sel = arg;
382 
383 		rval = check_selection(sd, sel);
384 		if (rval)
385 			return rval;
386 
387 		return v4l2_subdev_call(
388 			sd, pad, get_selection, subdev_fh->pad, sel);
389 	}
390 
391 	case VIDIOC_SUBDEV_S_SELECTION: {
392 		struct v4l2_subdev_selection *sel = arg;
393 
394 		rval = check_selection(sd, sel);
395 		if (rval)
396 			return rval;
397 
398 		return v4l2_subdev_call(
399 			sd, pad, set_selection, subdev_fh->pad, sel);
400 	}
401 
402 	case VIDIOC_G_EDID: {
403 		struct v4l2_subdev_edid *edid = arg;
404 
405 		rval = check_edid(sd, edid);
406 		if (rval)
407 			return rval;
408 
409 		return v4l2_subdev_call(sd, pad, get_edid, edid);
410 	}
411 
412 	case VIDIOC_S_EDID: {
413 		struct v4l2_subdev_edid *edid = arg;
414 
415 		rval = check_edid(sd, edid);
416 		if (rval)
417 			return rval;
418 
419 		return v4l2_subdev_call(sd, pad, set_edid, edid);
420 	}
421 
422 	case VIDIOC_SUBDEV_DV_TIMINGS_CAP: {
423 		struct v4l2_dv_timings_cap *cap = arg;
424 
425 		if (cap->pad >= sd->entity.num_pads)
426 			return -EINVAL;
427 
428 		return v4l2_subdev_call(sd, pad, dv_timings_cap, cap);
429 	}
430 
431 	case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: {
432 		struct v4l2_enum_dv_timings *dvt = arg;
433 
434 		if (dvt->pad >= sd->entity.num_pads)
435 			return -EINVAL;
436 
437 		return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt);
438 	}
439 
440 	case VIDIOC_SUBDEV_QUERY_DV_TIMINGS:
441 		return v4l2_subdev_call(sd, video, query_dv_timings, arg);
442 
443 	case VIDIOC_SUBDEV_G_DV_TIMINGS:
444 		return v4l2_subdev_call(sd, video, g_dv_timings, arg);
445 
446 	case VIDIOC_SUBDEV_S_DV_TIMINGS:
447 		return v4l2_subdev_call(sd, video, s_dv_timings, arg);
448 #endif
449 	default:
450 		return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
451 	}
452 
453 	return 0;
454 }
455 
456 static long subdev_ioctl(struct file *file, unsigned int cmd,
457 	unsigned long arg)
458 {
459 	return video_usercopy(file, cmd, arg, subdev_do_ioctl);
460 }
461 
462 #ifdef CONFIG_COMPAT
463 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
464 	unsigned long arg)
465 {
466 	struct video_device *vdev = video_devdata(file);
467 	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
468 
469 	return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg);
470 }
471 #endif
472 
473 static unsigned int subdev_poll(struct file *file, poll_table *wait)
474 {
475 	struct video_device *vdev = video_devdata(file);
476 	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
477 	struct v4l2_fh *fh = file->private_data;
478 
479 	if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
480 		return POLLERR;
481 
482 	poll_wait(file, &fh->wait, wait);
483 
484 	if (v4l2_event_pending(fh))
485 		return POLLPRI;
486 
487 	return 0;
488 }
489 
490 const struct v4l2_file_operations v4l2_subdev_fops = {
491 	.owner = THIS_MODULE,
492 	.open = subdev_open,
493 	.unlocked_ioctl = subdev_ioctl,
494 #ifdef CONFIG_COMPAT
495 	.compat_ioctl32 = subdev_compat_ioctl32,
496 #endif
497 	.release = subdev_close,
498 	.poll = subdev_poll,
499 };
500 
501 #ifdef CONFIG_MEDIA_CONTROLLER
502 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
503 				      struct media_link *link,
504 				      struct v4l2_subdev_format *source_fmt,
505 				      struct v4l2_subdev_format *sink_fmt)
506 {
507 	/* The width, height and code must match. */
508 	if (source_fmt->format.width != sink_fmt->format.width
509 	    || source_fmt->format.height != sink_fmt->format.height
510 	    || source_fmt->format.code != sink_fmt->format.code)
511 		return -EINVAL;
512 
513 	/* The field order must match, or the sink field order must be NONE
514 	 * to support interlaced hardware connected to bridges that support
515 	 * progressive formats only.
516 	 */
517 	if (source_fmt->format.field != sink_fmt->format.field &&
518 	    sink_fmt->format.field != V4L2_FIELD_NONE)
519 		return -EINVAL;
520 
521 	return 0;
522 }
523 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);
524 
525 static int
526 v4l2_subdev_link_validate_get_format(struct media_pad *pad,
527 				     struct v4l2_subdev_format *fmt)
528 {
529 	if (media_entity_type(pad->entity) == MEDIA_ENT_T_V4L2_SUBDEV) {
530 		struct v4l2_subdev *sd =
531 			media_entity_to_v4l2_subdev(pad->entity);
532 
533 		fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
534 		fmt->pad = pad->index;
535 		return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
536 	}
537 
538 	WARN(pad->entity->type != MEDIA_ENT_T_DEVNODE_V4L,
539 	     "Driver bug! Wrong media entity type 0x%08x, entity %s\n",
540 	     pad->entity->type, pad->entity->name);
541 
542 	return -EINVAL;
543 }
544 
545 int v4l2_subdev_link_validate(struct media_link *link)
546 {
547 	struct v4l2_subdev *sink;
548 	struct v4l2_subdev_format sink_fmt, source_fmt;
549 	int rval;
550 
551 	rval = v4l2_subdev_link_validate_get_format(
552 		link->source, &source_fmt);
553 	if (rval < 0)
554 		return 0;
555 
556 	rval = v4l2_subdev_link_validate_get_format(
557 		link->sink, &sink_fmt);
558 	if (rval < 0)
559 		return 0;
560 
561 	sink = media_entity_to_v4l2_subdev(link->sink->entity);
562 
563 	rval = v4l2_subdev_call(sink, pad, link_validate, link,
564 				&source_fmt, &sink_fmt);
565 	if (rval != -ENOIOCTLCMD)
566 		return rval;
567 
568 	return v4l2_subdev_link_validate_default(
569 		sink, link, &source_fmt, &sink_fmt);
570 }
571 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
572 #endif /* CONFIG_MEDIA_CONTROLLER */
573 
574 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
575 {
576 	INIT_LIST_HEAD(&sd->list);
577 	BUG_ON(!ops);
578 	sd->ops = ops;
579 	sd->v4l2_dev = NULL;
580 	sd->flags = 0;
581 	sd->name[0] = '\0';
582 	sd->grp_id = 0;
583 	sd->dev_priv = NULL;
584 	sd->host_priv = NULL;
585 #if defined(CONFIG_MEDIA_CONTROLLER)
586 	sd->entity.name = sd->name;
587 	sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV;
588 #endif
589 }
590 EXPORT_SYMBOL(v4l2_subdev_init);
591