1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Media device
  4 *
  5 * Copyright (C) 2010 Nokia Corporation
  6 *
  7 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
  8 *	     Sakari Ailus <sakari.ailus@iki.fi>
  9 */
 10
 11#include <linux/compat.h>
 12#include <linux/export.h>
 13#include <linux/idr.h>
 14#include <linux/ioctl.h>
 15#include <linux/media.h>
 16#include <linux/slab.h>
 17#include <linux/types.h>
 18#include <linux/pci.h>
 19#include <linux/usb.h>
 20#include <linux/version.h>
 21
 22#include <media/media-device.h>
 23#include <media/media-devnode.h>
 24#include <media/media-entity.h>
 25#include <media/media-request.h>
 26
 27#ifdef CONFIG_MEDIA_CONTROLLER
 28
 29/*
 30 * Legacy defines from linux/media.h. This is the only place we need this
 31 * so we just define it here. The media.h header doesn't expose it to the
 32 * kernel to prevent it from being used by drivers, but here (and only here!)
 33 * we need it to handle the legacy behavior.
 34 */
 35#define MEDIA_ENT_SUBTYPE_MASK			0x0000ffff
 36#define MEDIA_ENT_T_DEVNODE_UNKNOWN		(MEDIA_ENT_F_OLD_BASE | \
 37						 MEDIA_ENT_SUBTYPE_MASK)
 38
 39/* -----------------------------------------------------------------------------
 40 * Userspace API
 41 */
 42
 43static inline void __user *media_get_uptr(__u64 arg)
 44{
 45	return (void __user *)(uintptr_t)arg;
 46}
 47
 48static int media_device_open(struct file *filp)
 49{
 50	return 0;
 51}
 52
 53static int media_device_close(struct file *filp)
 54{
 55	return 0;
 56}
 57
 58static long media_device_get_info(struct media_device *dev, void *arg)
 59{
 60	struct media_device_info *info = arg;
 61
 62	memset(info, 0, sizeof(*info));
 63
 64	if (dev->driver_name[0])
 65		strscpy(info->driver, dev->driver_name, sizeof(info->driver));
 66	else
 67		strscpy(info->driver, dev->dev->driver->name,
 68			sizeof(info->driver));
 69
 70	strscpy(info->model, dev->model, sizeof(info->model));
 71	strscpy(info->serial, dev->serial, sizeof(info->serial));
 72	strscpy(info->bus_info, dev->bus_info, sizeof(info->bus_info));
 73
 74	info->media_version = LINUX_VERSION_CODE;
 75	info->driver_version = info->media_version;
 76	info->hw_revision = dev->hw_revision;
 77
 78	return 0;
 79}
 80
 81static struct media_entity *find_entity(struct media_device *mdev, u32 id)
 82{
 83	struct media_entity *entity;
 84	int next = id & MEDIA_ENT_ID_FLAG_NEXT;
 85
 86	id &= ~MEDIA_ENT_ID_FLAG_NEXT;
 87
 88	media_device_for_each_entity(entity, mdev) {
 89		if (((media_entity_id(entity) == id) && !next) ||
 90		    ((media_entity_id(entity) > id) && next)) {
 91			return entity;
 92		}
 93	}
 94
 95	return NULL;
 96}
 97
 98static long media_device_enum_entities(struct media_device *mdev, void *arg)
 99{
100	struct media_entity_desc *entd = arg;
101	struct media_entity *ent;
102
103	ent = find_entity(mdev, entd->id);
104	if (ent == NULL)
105		return -EINVAL;
106
107	memset(entd, 0, sizeof(*entd));
108
109	entd->id = media_entity_id(ent);
110	if (ent->name)
111		strscpy(entd->name, ent->name, sizeof(entd->name));
112	entd->type = ent->function;
113	entd->revision = 0;		/* Unused */
114	entd->flags = ent->flags;
115	entd->group_id = 0;		/* Unused */
116	entd->pads = ent->num_pads;
117	entd->links = ent->num_links - ent->num_backlinks;
118
119	/*
120	 * Workaround for a bug at media-ctl <= v1.10 that makes it to
121	 * do the wrong thing if the entity function doesn't belong to
122	 * either MEDIA_ENT_F_OLD_BASE or MEDIA_ENT_F_OLD_SUBDEV_BASE
123	 * Ranges.
124	 *
125	 * Non-subdevices are expected to be at the MEDIA_ENT_F_OLD_BASE,
126	 * or, otherwise, will be silently ignored by media-ctl when
127	 * printing the graphviz diagram. So, map them into the devnode
128	 * old range.
129	 */
130	if (ent->function < MEDIA_ENT_F_OLD_BASE ||
131	    ent->function > MEDIA_ENT_F_TUNER) {
132		if (is_media_entity_v4l2_subdev(ent))
133			entd->type = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
134		else if (ent->function != MEDIA_ENT_F_IO_V4L)
135			entd->type = MEDIA_ENT_T_DEVNODE_UNKNOWN;
136	}
137
138	memcpy(&entd->raw, &ent->info, sizeof(ent->info));
139
140	return 0;
141}
142
143static void media_device_kpad_to_upad(const struct media_pad *kpad,
144				      struct media_pad_desc *upad)
145{
146	upad->entity = media_entity_id(kpad->entity);
147	upad->index = kpad->index;
148	upad->flags = kpad->flags;
149}
150
151static long media_device_enum_links(struct media_device *mdev, void *arg)
152{
153	struct media_links_enum *links = arg;
154	struct media_entity *entity;
155
156	entity = find_entity(mdev, links->entity);
157	if (entity == NULL)
158		return -EINVAL;
159
160	if (links->pads) {
161		unsigned int p;
162
163		for (p = 0; p < entity->num_pads; p++) {
164			struct media_pad_desc pad;
165
166			memset(&pad, 0, sizeof(pad));
167			media_device_kpad_to_upad(&entity->pads[p], &pad);
168			if (copy_to_user(&links->pads[p], &pad, sizeof(pad)))
169				return -EFAULT;
170		}
171	}
172
173	if (links->links) {
174		struct media_link *link;
175		struct media_link_desc __user *ulink_desc = links->links;
176
177		list_for_each_entry(link, &entity->links, list) {
178			struct media_link_desc klink_desc;
179
180			/* Ignore backlinks. */
181			if (link->source->entity != entity)
182				continue;
183			memset(&klink_desc, 0, sizeof(klink_desc));
184			media_device_kpad_to_upad(link->source,
185						  &klink_desc.source);
186			media_device_kpad_to_upad(link->sink,
187						  &klink_desc.sink);
188			klink_desc.flags = link->flags;
189			if (copy_to_user(ulink_desc, &klink_desc,
190					 sizeof(*ulink_desc)))
191				return -EFAULT;
192			ulink_desc++;
193		}
194	}
195	memset(links->reserved, 0, sizeof(links->reserved));
196
197	return 0;
198}
199
200static long media_device_setup_link(struct media_device *mdev, void *arg)
201{
202	struct media_link_desc *linkd = arg;
203	struct media_link *link = NULL;
204	struct media_entity *source;
205	struct media_entity *sink;
206
207	/* Find the source and sink entities and link.
208	 */
209	source = find_entity(mdev, linkd->source.entity);
210	sink = find_entity(mdev, linkd->sink.entity);
211
212	if (source == NULL || sink == NULL)
213		return -EINVAL;
214
215	if (linkd->source.index >= source->num_pads ||
216	    linkd->sink.index >= sink->num_pads)
217		return -EINVAL;
218
219	link = media_entity_find_link(&source->pads[linkd->source.index],
220				      &sink->pads[linkd->sink.index]);
221	if (link == NULL)
222		return -EINVAL;
223
224	memset(linkd->reserved, 0, sizeof(linkd->reserved));
225
226	/* Setup the link on both entities. */
227	return __media_entity_setup_link(link, linkd->flags);
228}
229
230static long media_device_get_topology(struct media_device *mdev, void *arg)
231{
232	struct media_v2_topology *topo = arg;
233	struct media_entity *entity;
234	struct media_interface *intf;
235	struct media_pad *pad;
236	struct media_link *link;
237	struct media_v2_entity kentity, __user *uentity;
238	struct media_v2_interface kintf, __user *uintf;
239	struct media_v2_pad kpad, __user *upad;
240	struct media_v2_link klink, __user *ulink;
241	unsigned int i;
242	int ret = 0;
243
244	topo->topology_version = mdev->topology_version;
245
246	/* Get entities and number of entities */
247	i = 0;
248	uentity = media_get_uptr(topo->ptr_entities);
249	media_device_for_each_entity(entity, mdev) {
250		i++;
251		if (ret || !uentity)
252			continue;
253
254		if (i > topo->num_entities) {
255			ret = -ENOSPC;
256			continue;
257		}
258
259		/* Copy fields to userspace struct if not error */
260		memset(&kentity, 0, sizeof(kentity));
261		kentity.id = entity->graph_obj.id;
262		kentity.function = entity->function;
263		kentity.flags = entity->flags;
264		strscpy(kentity.name, entity->name,
265			sizeof(kentity.name));
266
267		if (copy_to_user(uentity, &kentity, sizeof(kentity)))
268			ret = -EFAULT;
269		uentity++;
270	}
271	topo->num_entities = i;
272	topo->reserved1 = 0;
273
274	/* Get interfaces and number of interfaces */
275	i = 0;
276	uintf = media_get_uptr(topo->ptr_interfaces);
277	media_device_for_each_intf(intf, mdev) {
278		i++;
279		if (ret || !uintf)
280			continue;
281
282		if (i > topo->num_interfaces) {
283			ret = -ENOSPC;
284			continue;
285		}
286
287		memset(&kintf, 0, sizeof(kintf));
288
289		/* Copy intf fields to userspace struct */
290		kintf.id = intf->graph_obj.id;
291		kintf.intf_type = intf->type;
292		kintf.flags = intf->flags;
293
294		if (media_type(&intf->graph_obj) == MEDIA_GRAPH_INTF_DEVNODE) {
295			struct media_intf_devnode *devnode;
296
297			devnode = intf_to_devnode(intf);
298
299			kintf.devnode.major = devnode->major;
300			kintf.devnode.minor = devnode->minor;
301		}
302
303		if (copy_to_user(uintf, &kintf, sizeof(kintf)))
304			ret = -EFAULT;
305		uintf++;
306	}
307	topo->num_interfaces = i;
308	topo->reserved2 = 0;
309
310	/* Get pads and number of pads */
311	i = 0;
312	upad = media_get_uptr(topo->ptr_pads);
313	media_device_for_each_pad(pad, mdev) {
314		i++;
315		if (ret || !upad)
316			continue;
317
318		if (i > topo->num_pads) {
319			ret = -ENOSPC;
320			continue;
321		}
322
323		memset(&kpad, 0, sizeof(kpad));
324
325		/* Copy pad fields to userspace struct */
326		kpad.id = pad->graph_obj.id;
327		kpad.entity_id = pad->entity->graph_obj.id;
328		kpad.flags = pad->flags;
329		kpad.index = pad->index;
330
331		if (copy_to_user(upad, &kpad, sizeof(kpad)))
332			ret = -EFAULT;
333		upad++;
334	}
335	topo->num_pads = i;
336	topo->reserved3 = 0;
337
338	/* Get links and number of links */
339	i = 0;
340	ulink = media_get_uptr(topo->ptr_links);
341	media_device_for_each_link(link, mdev) {
342		if (link->is_backlink)
343			continue;
344
345		i++;
346
347		if (ret || !ulink)
348			continue;
349
350		if (i > topo->num_links) {
351			ret = -ENOSPC;
352			continue;
353		}
354
355		memset(&klink, 0, sizeof(klink));
356
357		/* Copy link fields to userspace struct */
358		klink.id = link->graph_obj.id;
359		klink.source_id = link->gobj0->id;
360		klink.sink_id = link->gobj1->id;
361		klink.flags = link->flags;
362
363		if (copy_to_user(ulink, &klink, sizeof(klink)))
364			ret = -EFAULT;
365		ulink++;
366	}
367	topo->num_links = i;
368	topo->reserved4 = 0;
369
370	return ret;
371}
372
373static long media_device_request_alloc(struct media_device *mdev, void *arg)
 
374{
375	int *alloc_fd = arg;
376
377	if (!mdev->ops || !mdev->ops->req_validate || !mdev->ops->req_queue)
378		return -ENOTTY;
379
380	return media_request_alloc(mdev, alloc_fd);
 
 
 
381}
382
383static long copy_arg_from_user(void *karg, void __user *uarg, unsigned int cmd)
384{
385	if ((_IOC_DIR(cmd) & _IOC_WRITE) &&
386	    copy_from_user(karg, uarg, _IOC_SIZE(cmd)))
387		return -EFAULT;
388
389	return 0;
390}
391
392static long copy_arg_to_user(void __user *uarg, void *karg, unsigned int cmd)
393{
394	if ((_IOC_DIR(cmd) & _IOC_READ) &&
395	    copy_to_user(uarg, karg, _IOC_SIZE(cmd)))
396		return -EFAULT;
397
398	return 0;
399}
400
401/* Do acquire the graph mutex */
402#define MEDIA_IOC_FL_GRAPH_MUTEX	BIT(0)
403
404#define MEDIA_IOC_ARG(__cmd, func, fl, from_user, to_user)		\
405	[_IOC_NR(MEDIA_IOC_##__cmd)] = {				\
406		.cmd = MEDIA_IOC_##__cmd,				\
407		.fn = func,						\
408		.flags = fl,						\
409		.arg_from_user = from_user,				\
410		.arg_to_user = to_user,					\
411	}
412
413#define MEDIA_IOC(__cmd, func, fl)					\
414	MEDIA_IOC_ARG(__cmd, func, fl, copy_arg_from_user, copy_arg_to_user)
415
416/* the table is indexed by _IOC_NR(cmd) */
417struct media_ioctl_info {
418	unsigned int cmd;
419	unsigned short flags;
420	long (*fn)(struct media_device *dev, void *arg);
421	long (*arg_from_user)(void *karg, void __user *uarg, unsigned int cmd);
422	long (*arg_to_user)(void __user *uarg, void *karg, unsigned int cmd);
423};
424
425static const struct media_ioctl_info ioctl_info[] = {
426	MEDIA_IOC(DEVICE_INFO, media_device_get_info, MEDIA_IOC_FL_GRAPH_MUTEX),
427	MEDIA_IOC(ENUM_ENTITIES, media_device_enum_entities, MEDIA_IOC_FL_GRAPH_MUTEX),
428	MEDIA_IOC(ENUM_LINKS, media_device_enum_links, MEDIA_IOC_FL_GRAPH_MUTEX),
429	MEDIA_IOC(SETUP_LINK, media_device_setup_link, MEDIA_IOC_FL_GRAPH_MUTEX),
430	MEDIA_IOC(G_TOPOLOGY, media_device_get_topology, MEDIA_IOC_FL_GRAPH_MUTEX),
431	MEDIA_IOC(REQUEST_ALLOC, media_device_request_alloc, 0),
432};
433
434static long media_device_ioctl(struct file *filp, unsigned int cmd,
435			       unsigned long __arg)
436{
437	struct media_devnode *devnode = media_devnode_data(filp);
438	struct media_device *dev = devnode->media_dev;
439	const struct media_ioctl_info *info;
440	void __user *arg = (void __user *)__arg;
441	char __karg[256], *karg = __karg;
442	long ret;
443
444	if (_IOC_NR(cmd) >= ARRAY_SIZE(ioctl_info)
445	    || ioctl_info[_IOC_NR(cmd)].cmd != cmd)
446		return -ENOIOCTLCMD;
447
448	info = &ioctl_info[_IOC_NR(cmd)];
449
450	if (_IOC_SIZE(info->cmd) > sizeof(__karg)) {
451		karg = kmalloc(_IOC_SIZE(info->cmd), GFP_KERNEL);
452		if (!karg)
453			return -ENOMEM;
454	}
455
456	if (info->arg_from_user) {
457		ret = info->arg_from_user(karg, arg, cmd);
458		if (ret)
459			goto out_free;
460	}
461
462	if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
463		mutex_lock(&dev->graph_mutex);
464
465	ret = info->fn(dev, karg);
466
467	if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
468		mutex_unlock(&dev->graph_mutex);
469
470	if (!ret && info->arg_to_user)
471		ret = info->arg_to_user(arg, karg, cmd);
472
473out_free:
474	if (karg != __karg)
475		kfree(karg);
476
477	return ret;
478}
479
480#ifdef CONFIG_COMPAT
481
482struct media_links_enum32 {
483	__u32 entity;
484	compat_uptr_t pads; /* struct media_pad_desc * */
485	compat_uptr_t links; /* struct media_link_desc * */
486	__u32 reserved[4];
487};
488
489static long media_device_enum_links32(struct media_device *mdev,
490				      struct media_links_enum32 __user *ulinks)
491{
492	struct media_links_enum links;
493	compat_uptr_t pads_ptr, links_ptr;
494	int ret;
495
496	memset(&links, 0, sizeof(links));
497
498	if (get_user(links.entity, &ulinks->entity)
499	    || get_user(pads_ptr, &ulinks->pads)
500	    || get_user(links_ptr, &ulinks->links))
501		return -EFAULT;
502
503	links.pads = compat_ptr(pads_ptr);
504	links.links = compat_ptr(links_ptr);
505
506	ret = media_device_enum_links(mdev, &links);
507	if (ret)
508		return ret;
509
510	if (copy_to_user(ulinks->reserved, links.reserved,
511			 sizeof(ulinks->reserved)))
512		return -EFAULT;
513	return 0;
514}
515
516#define MEDIA_IOC_ENUM_LINKS32		_IOWR('|', 0x02, struct media_links_enum32)
517
518static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
519				      unsigned long arg)
520{
521	struct media_devnode *devnode = media_devnode_data(filp);
522	struct media_device *dev = devnode->media_dev;
523	long ret;
524
525	switch (cmd) {
526	case MEDIA_IOC_ENUM_LINKS32:
527		mutex_lock(&dev->graph_mutex);
528		ret = media_device_enum_links32(dev,
529				(struct media_links_enum32 __user *)arg);
530		mutex_unlock(&dev->graph_mutex);
531		break;
532
533	default:
534		return media_device_ioctl(filp, cmd, arg);
535	}
536
537	return ret;
538}
539#endif /* CONFIG_COMPAT */
540
541static const struct media_file_operations media_device_fops = {
542	.owner = THIS_MODULE,
543	.open = media_device_open,
544	.ioctl = media_device_ioctl,
545#ifdef CONFIG_COMPAT
546	.compat_ioctl = media_device_compat_ioctl,
547#endif /* CONFIG_COMPAT */
548	.release = media_device_close,
549};
550
551/* -----------------------------------------------------------------------------
552 * sysfs
553 */
554
555static ssize_t model_show(struct device *cd,
556			  struct device_attribute *attr, char *buf)
557{
558	struct media_devnode *devnode = to_media_devnode(cd);
559	struct media_device *mdev = devnode->media_dev;
560
561	return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
562}
563
564static DEVICE_ATTR_RO(model);
565
566/* -----------------------------------------------------------------------------
567 * Registration/unregistration
568 */
569
570static void media_device_release(struct media_devnode *devnode)
571{
572	dev_dbg(devnode->parent, "Media device released\n");
573}
574
575static void __media_device_unregister_entity(struct media_entity *entity)
576{
577	struct media_device *mdev = entity->graph_obj.mdev;
578	struct media_link *link, *tmp;
579	struct media_interface *intf;
580	struct media_pad *iter;
581
582	ida_free(&mdev->entity_internal_idx, entity->internal_idx);
583
584	/* Remove all interface links pointing to this entity */
585	list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) {
586		list_for_each_entry_safe(link, tmp, &intf->links, list) {
587			if (link->entity == entity)
588				__media_remove_intf_link(link);
589		}
590	}
591
592	/* Remove all data links that belong to this entity */
593	__media_entity_remove_links(entity);
594
595	/* Remove all pads that belong to this entity */
596	media_entity_for_each_pad(entity, iter)
597		media_gobj_destroy(&iter->graph_obj);
598
599	/* Remove the entity */
600	media_gobj_destroy(&entity->graph_obj);
601
602	/* invoke entity_notify callbacks to handle entity removal?? */
603}
604
605int __must_check media_device_register_entity(struct media_device *mdev,
606					      struct media_entity *entity)
607{
608	struct media_entity_notify *notify, *next;
609	struct media_pad *iter;
610	int ret;
611
612	if (entity->function == MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN ||
613	    entity->function == MEDIA_ENT_F_UNKNOWN)
614		dev_warn(mdev->dev,
615			 "Entity type for entity %s was not initialized!\n",
616			 entity->name);
617
618	/* Warn if we apparently re-register an entity */
619	WARN_ON(entity->graph_obj.mdev != NULL);
620	entity->graph_obj.mdev = mdev;
621	INIT_LIST_HEAD(&entity->links);
622	entity->num_links = 0;
623	entity->num_backlinks = 0;
624
625	ret = ida_alloc_min(&mdev->entity_internal_idx, 1, GFP_KERNEL);
626	if (ret < 0)
627		return ret;
628	entity->internal_idx = ret;
629
630	mutex_lock(&mdev->graph_mutex);
631	mdev->entity_internal_idx_max =
632		max(mdev->entity_internal_idx_max, entity->internal_idx);
633
634	/* Initialize media_gobj embedded at the entity */
635	media_gobj_create(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
636
637	/* Initialize objects at the pads */
638	media_entity_for_each_pad(entity, iter)
639		media_gobj_create(mdev, MEDIA_GRAPH_PAD, &iter->graph_obj);
 
640
641	/* invoke entity_notify callbacks */
642	list_for_each_entry_safe(notify, next, &mdev->entity_notify, list)
643		notify->notify(entity, notify->notify_data);
644
645	if (mdev->entity_internal_idx_max
646	    >= mdev->pm_count_walk.ent_enum.idx_max) {
647		struct media_graph new = { .top = 0 };
648
649		/*
650		 * Initialise the new graph walk before cleaning up
651		 * the old one in order not to spoil the graph walk
652		 * object of the media device if graph walk init fails.
653		 */
654		ret = media_graph_walk_init(&new, mdev);
655		if (ret) {
656			__media_device_unregister_entity(entity);
657			mutex_unlock(&mdev->graph_mutex);
658			return ret;
659		}
660		media_graph_walk_cleanup(&mdev->pm_count_walk);
661		mdev->pm_count_walk = new;
662	}
663	mutex_unlock(&mdev->graph_mutex);
664
665	return 0;
666}
667EXPORT_SYMBOL_GPL(media_device_register_entity);
668
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
669void media_device_unregister_entity(struct media_entity *entity)
670{
671	struct media_device *mdev = entity->graph_obj.mdev;
672
673	if (mdev == NULL)
674		return;
675
676	mutex_lock(&mdev->graph_mutex);
677	__media_device_unregister_entity(entity);
678	mutex_unlock(&mdev->graph_mutex);
679}
680EXPORT_SYMBOL_GPL(media_device_unregister_entity);
681
 
 
 
 
 
 
 
 
 
 
682void media_device_init(struct media_device *mdev)
683{
684	INIT_LIST_HEAD(&mdev->entities);
685	INIT_LIST_HEAD(&mdev->interfaces);
686	INIT_LIST_HEAD(&mdev->pads);
687	INIT_LIST_HEAD(&mdev->links);
688	INIT_LIST_HEAD(&mdev->entity_notify);
689
690	mutex_init(&mdev->req_queue_mutex);
691	mutex_init(&mdev->graph_mutex);
692	ida_init(&mdev->entity_internal_idx);
693
694	atomic_set(&mdev->request_id, 0);
695
696	if (!*mdev->bus_info)
697		media_set_bus_info(mdev->bus_info, sizeof(mdev->bus_info),
698				   mdev->dev);
699
700	dev_dbg(mdev->dev, "Media device initialized\n");
701}
702EXPORT_SYMBOL_GPL(media_device_init);
703
704void media_device_cleanup(struct media_device *mdev)
705{
706	ida_destroy(&mdev->entity_internal_idx);
707	mdev->entity_internal_idx_max = 0;
708	media_graph_walk_cleanup(&mdev->pm_count_walk);
709	mutex_destroy(&mdev->graph_mutex);
710	mutex_destroy(&mdev->req_queue_mutex);
711}
712EXPORT_SYMBOL_GPL(media_device_cleanup);
713
714int __must_check __media_device_register(struct media_device *mdev,
715					 struct module *owner)
716{
717	struct media_devnode *devnode;
718	int ret;
719
720	devnode = kzalloc(sizeof(*devnode), GFP_KERNEL);
721	if (!devnode)
722		return -ENOMEM;
723
724	/* Register the device node. */
725	mdev->devnode = devnode;
726	devnode->fops = &media_device_fops;
727	devnode->parent = mdev->dev;
728	devnode->release = media_device_release;
729
730	/* Set version 0 to indicate user-space that the graph is static */
731	mdev->topology_version = 0;
732
733	ret = media_devnode_register(mdev, devnode, owner);
734	if (ret < 0) {
735		/* devnode free is handled in media_devnode_*() */
736		mdev->devnode = NULL;
737		return ret;
738	}
739
740	ret = device_create_file(&devnode->dev, &dev_attr_model);
741	if (ret < 0) {
742		/* devnode free is handled in media_devnode_*() */
743		mdev->devnode = NULL;
744		media_devnode_unregister_prepare(devnode);
745		media_devnode_unregister(devnode);
746		return ret;
747	}
748
749	dev_dbg(mdev->dev, "Media device registered\n");
750
751	return 0;
752}
753EXPORT_SYMBOL_GPL(__media_device_register);
754
755void media_device_register_entity_notify(struct media_device *mdev,
756					struct media_entity_notify *nptr)
757{
758	mutex_lock(&mdev->graph_mutex);
759	list_add_tail(&nptr->list, &mdev->entity_notify);
760	mutex_unlock(&mdev->graph_mutex);
 
761}
762EXPORT_SYMBOL_GPL(media_device_register_entity_notify);
763
764/*
765 * Note: Should be called with mdev->lock held.
766 */
767static void __media_device_unregister_entity_notify(struct media_device *mdev,
768					struct media_entity_notify *nptr)
769{
770	list_del(&nptr->list);
771}
772
773void media_device_unregister_entity_notify(struct media_device *mdev,
774					struct media_entity_notify *nptr)
775{
776	mutex_lock(&mdev->graph_mutex);
777	__media_device_unregister_entity_notify(mdev, nptr);
778	mutex_unlock(&mdev->graph_mutex);
779}
780EXPORT_SYMBOL_GPL(media_device_unregister_entity_notify);
781
782void media_device_unregister(struct media_device *mdev)
783{
784	struct media_entity *entity;
785	struct media_entity *next;
786	struct media_interface *intf, *tmp_intf;
787	struct media_entity_notify *notify, *nextp;
788
789	if (mdev == NULL)
790		return;
791
792	mutex_lock(&mdev->graph_mutex);
793
794	/* Check if mdev was ever registered at all */
795	if (!media_devnode_is_registered(mdev->devnode)) {
796		mutex_unlock(&mdev->graph_mutex);
797		return;
798	}
799
800	/* Clear the devnode register bit to avoid races with media dev open */
801	media_devnode_unregister_prepare(mdev->devnode);
802
803	/* Remove all entities from the media device */
804	list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list)
805		__media_device_unregister_entity(entity);
806
807	/* Remove all entity_notify callbacks from the media device */
808	list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list)
809		__media_device_unregister_entity_notify(mdev, notify);
810
811	/* Remove all interfaces from the media device */
812	list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces,
813				 graph_obj.list) {
814		/*
815		 * Unlink the interface, but don't free it here; the
816		 * module which created it is responsible for freeing
817		 * it
818		 */
819		__media_remove_intf_links(intf);
820		media_gobj_destroy(&intf->graph_obj);
821	}
822
823	mutex_unlock(&mdev->graph_mutex);
824
825	dev_dbg(mdev->dev, "Media device unregistered\n");
826
827	device_remove_file(&mdev->devnode->dev, &dev_attr_model);
828	media_devnode_unregister(mdev->devnode);
829	/* devnode free is handled in media_devnode_*() */
830	mdev->devnode = NULL;
831}
832EXPORT_SYMBOL_GPL(media_device_unregister);
833
834#if IS_ENABLED(CONFIG_PCI)
835void media_device_pci_init(struct media_device *mdev,
836			   struct pci_dev *pci_dev,
837			   const char *name)
838{
839	mdev->dev = &pci_dev->dev;
840
841	if (name)
842		strscpy(mdev->model, name, sizeof(mdev->model));
843	else
844		strscpy(mdev->model, pci_name(pci_dev), sizeof(mdev->model));
845
846	sprintf(mdev->bus_info, "PCI:%s", pci_name(pci_dev));
847
848	mdev->hw_revision = (pci_dev->subsystem_vendor << 16)
849			    | pci_dev->subsystem_device;
850
851	media_device_init(mdev);
852}
853EXPORT_SYMBOL_GPL(media_device_pci_init);
854#endif
855
856#if IS_ENABLED(CONFIG_USB)
857void __media_device_usb_init(struct media_device *mdev,
858			     struct usb_device *udev,
859			     const char *board_name,
860			     const char *driver_name)
861{
862	mdev->dev = &udev->dev;
863
864	if (driver_name)
865		strscpy(mdev->driver_name, driver_name,
866			sizeof(mdev->driver_name));
867
868	if (board_name)
869		strscpy(mdev->model, board_name, sizeof(mdev->model));
870	else if (udev->product)
871		strscpy(mdev->model, udev->product, sizeof(mdev->model));
872	else
873		strscpy(mdev->model, "unknown model", sizeof(mdev->model));
874	if (udev->serial)
875		strscpy(mdev->serial, udev->serial, sizeof(mdev->serial));
876	usb_make_path(udev, mdev->bus_info, sizeof(mdev->bus_info));
877	mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
878
879	media_device_init(mdev);
880}
881EXPORT_SYMBOL_GPL(__media_device_usb_init);
882#endif
883
884
885#endif /* CONFIG_MEDIA_CONTROLLER */