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
media_get_uptr(__u64 arg)43 static inline void __user *media_get_uptr(__u64 arg)
44 {
45 return (void __user *)(uintptr_t)arg;
46 }
47
media_device_open(struct file * filp)48 static int media_device_open(struct file *filp)
49 {
50 return 0;
51 }
52
media_device_close(struct file * filp)53 static int media_device_close(struct file *filp)
54 {
55 return 0;
56 }
57
media_device_get_info(struct media_device * dev,void * arg)58 static 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
find_entity(struct media_device * mdev,u32 id)81 static 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
media_device_enum_entities(struct media_device * mdev,void * arg)98 static 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
media_device_kpad_to_upad(const struct media_pad * kpad,struct media_pad_desc * upad)143 static 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
media_device_enum_links(struct media_device * mdev,void * arg)151 static 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
media_device_setup_link(struct media_device * mdev,void * arg)200 static 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
media_device_get_topology(struct media_device * mdev,void * arg)230 static 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
media_device_request_alloc(struct media_device * mdev,int * alloc_fd)373 static long media_device_request_alloc(struct media_device *mdev,
374 int *alloc_fd)
375 {
376 #ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API
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 #else
382 return -ENOTTY;
383 #endif
384 }
385
copy_arg_from_user(void * karg,void __user * uarg,unsigned int cmd)386 static long copy_arg_from_user(void *karg, void __user *uarg, unsigned int cmd)
387 {
388 if ((_IOC_DIR(cmd) & _IOC_WRITE) &&
389 copy_from_user(karg, uarg, _IOC_SIZE(cmd)))
390 return -EFAULT;
391
392 return 0;
393 }
394
copy_arg_to_user(void __user * uarg,void * karg,unsigned int cmd)395 static long copy_arg_to_user(void __user *uarg, void *karg, unsigned int cmd)
396 {
397 if ((_IOC_DIR(cmd) & _IOC_READ) &&
398 copy_to_user(uarg, karg, _IOC_SIZE(cmd)))
399 return -EFAULT;
400
401 return 0;
402 }
403
404 /* Do acquire the graph mutex */
405 #define MEDIA_IOC_FL_GRAPH_MUTEX BIT(0)
406
407 #define MEDIA_IOC_ARG(__cmd, func, fl, from_user, to_user) \
408 [_IOC_NR(MEDIA_IOC_##__cmd)] = { \
409 .cmd = MEDIA_IOC_##__cmd, \
410 .fn = (long (*)(struct media_device *, void *))func, \
411 .flags = fl, \
412 .arg_from_user = from_user, \
413 .arg_to_user = to_user, \
414 }
415
416 #define MEDIA_IOC(__cmd, func, fl) \
417 MEDIA_IOC_ARG(__cmd, func, fl, copy_arg_from_user, copy_arg_to_user)
418
419 /* the table is indexed by _IOC_NR(cmd) */
420 struct media_ioctl_info {
421 unsigned int cmd;
422 unsigned short flags;
423 long (*fn)(struct media_device *dev, void *arg);
424 long (*arg_from_user)(void *karg, void __user *uarg, unsigned int cmd);
425 long (*arg_to_user)(void __user *uarg, void *karg, unsigned int cmd);
426 };
427
428 static const struct media_ioctl_info ioctl_info[] = {
429 MEDIA_IOC(DEVICE_INFO, media_device_get_info, MEDIA_IOC_FL_GRAPH_MUTEX),
430 MEDIA_IOC(ENUM_ENTITIES, media_device_enum_entities, MEDIA_IOC_FL_GRAPH_MUTEX),
431 MEDIA_IOC(ENUM_LINKS, media_device_enum_links, MEDIA_IOC_FL_GRAPH_MUTEX),
432 MEDIA_IOC(SETUP_LINK, media_device_setup_link, MEDIA_IOC_FL_GRAPH_MUTEX),
433 MEDIA_IOC(G_TOPOLOGY, media_device_get_topology, MEDIA_IOC_FL_GRAPH_MUTEX),
434 MEDIA_IOC(REQUEST_ALLOC, media_device_request_alloc, 0),
435 };
436
media_device_ioctl(struct file * filp,unsigned int cmd,unsigned long __arg)437 static long media_device_ioctl(struct file *filp, unsigned int cmd,
438 unsigned long __arg)
439 {
440 struct media_devnode *devnode = media_devnode_data(filp);
441 struct media_device *dev = devnode->media_dev;
442 const struct media_ioctl_info *info;
443 void __user *arg = (void __user *)__arg;
444 char __karg[256], *karg = __karg;
445 long ret;
446
447 if (_IOC_NR(cmd) >= ARRAY_SIZE(ioctl_info)
448 || ioctl_info[_IOC_NR(cmd)].cmd != cmd)
449 return -ENOIOCTLCMD;
450
451 info = &ioctl_info[_IOC_NR(cmd)];
452
453 if (_IOC_SIZE(info->cmd) > sizeof(__karg)) {
454 karg = kmalloc(_IOC_SIZE(info->cmd), GFP_KERNEL);
455 if (!karg)
456 return -ENOMEM;
457 }
458
459 if (info->arg_from_user) {
460 ret = info->arg_from_user(karg, arg, cmd);
461 if (ret)
462 goto out_free;
463 }
464
465 if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
466 mutex_lock(&dev->graph_mutex);
467
468 ret = info->fn(dev, karg);
469
470 if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
471 mutex_unlock(&dev->graph_mutex);
472
473 if (!ret && info->arg_to_user)
474 ret = info->arg_to_user(arg, karg, cmd);
475
476 out_free:
477 if (karg != __karg)
478 kfree(karg);
479
480 return ret;
481 }
482
483 #ifdef CONFIG_COMPAT
484
485 struct media_links_enum32 {
486 __u32 entity;
487 compat_uptr_t pads; /* struct media_pad_desc * */
488 compat_uptr_t links; /* struct media_link_desc * */
489 __u32 reserved[4];
490 };
491
media_device_enum_links32(struct media_device * mdev,struct media_links_enum32 __user * ulinks)492 static long media_device_enum_links32(struct media_device *mdev,
493 struct media_links_enum32 __user *ulinks)
494 {
495 struct media_links_enum links;
496 compat_uptr_t pads_ptr, links_ptr;
497 int ret;
498
499 memset(&links, 0, sizeof(links));
500
501 if (get_user(links.entity, &ulinks->entity)
502 || get_user(pads_ptr, &ulinks->pads)
503 || get_user(links_ptr, &ulinks->links))
504 return -EFAULT;
505
506 links.pads = compat_ptr(pads_ptr);
507 links.links = compat_ptr(links_ptr);
508
509 ret = media_device_enum_links(mdev, &links);
510 if (ret)
511 return ret;
512
513 if (copy_to_user(ulinks->reserved, links.reserved,
514 sizeof(ulinks->reserved)))
515 return -EFAULT;
516 return 0;
517 }
518
519 #define MEDIA_IOC_ENUM_LINKS32 _IOWR('|', 0x02, struct media_links_enum32)
520
media_device_compat_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)521 static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
522 unsigned long arg)
523 {
524 struct media_devnode *devnode = media_devnode_data(filp);
525 struct media_device *dev = devnode->media_dev;
526 long ret;
527
528 switch (cmd) {
529 case MEDIA_IOC_ENUM_LINKS32:
530 mutex_lock(&dev->graph_mutex);
531 ret = media_device_enum_links32(dev,
532 (struct media_links_enum32 __user *)arg);
533 mutex_unlock(&dev->graph_mutex);
534 break;
535
536 default:
537 return media_device_ioctl(filp, cmd, arg);
538 }
539
540 return ret;
541 }
542 #endif /* CONFIG_COMPAT */
543
544 static const struct media_file_operations media_device_fops = {
545 .owner = THIS_MODULE,
546 .open = media_device_open,
547 .ioctl = media_device_ioctl,
548 #ifdef CONFIG_COMPAT
549 .compat_ioctl = media_device_compat_ioctl,
550 #endif /* CONFIG_COMPAT */
551 .release = media_device_close,
552 };
553
554 /* -----------------------------------------------------------------------------
555 * sysfs
556 */
557
show_model(struct device * cd,struct device_attribute * attr,char * buf)558 static ssize_t show_model(struct device *cd,
559 struct device_attribute *attr, char *buf)
560 {
561 struct media_devnode *devnode = to_media_devnode(cd);
562 struct media_device *mdev = devnode->media_dev;
563
564 return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
565 }
566
567 static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
568
569 /* -----------------------------------------------------------------------------
570 * Registration/unregistration
571 */
572
media_device_release(struct media_devnode * devnode)573 static void media_device_release(struct media_devnode *devnode)
574 {
575 dev_dbg(devnode->parent, "Media device released\n");
576 }
577
578 /**
579 * media_device_register_entity - Register an entity with a media device
580 * @mdev: The media device
581 * @entity: The entity
582 */
media_device_register_entity(struct media_device * mdev,struct media_entity * entity)583 int __must_check media_device_register_entity(struct media_device *mdev,
584 struct media_entity *entity)
585 {
586 struct media_entity_notify *notify, *next;
587 unsigned int i;
588 int ret;
589
590 if (entity->function == MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN ||
591 entity->function == MEDIA_ENT_F_UNKNOWN)
592 dev_warn(mdev->dev,
593 "Entity type for entity %s was not initialized!\n",
594 entity->name);
595
596 /* Warn if we apparently re-register an entity */
597 WARN_ON(entity->graph_obj.mdev != NULL);
598 entity->graph_obj.mdev = mdev;
599 INIT_LIST_HEAD(&entity->links);
600 entity->num_links = 0;
601 entity->num_backlinks = 0;
602
603 ret = ida_alloc_min(&mdev->entity_internal_idx, 1, GFP_KERNEL);
604 if (ret < 0)
605 return ret;
606 entity->internal_idx = ret;
607
608 mutex_lock(&mdev->graph_mutex);
609 mdev->entity_internal_idx_max =
610 max(mdev->entity_internal_idx_max, entity->internal_idx);
611
612 /* Initialize media_gobj embedded at the entity */
613 media_gobj_create(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
614
615 /* Initialize objects at the pads */
616 for (i = 0; i < entity->num_pads; i++)
617 media_gobj_create(mdev, MEDIA_GRAPH_PAD,
618 &entity->pads[i].graph_obj);
619
620 /* invoke entity_notify callbacks */
621 list_for_each_entry_safe(notify, next, &mdev->entity_notify, list)
622 notify->notify(entity, notify->notify_data);
623
624 if (mdev->entity_internal_idx_max
625 >= mdev->pm_count_walk.ent_enum.idx_max) {
626 struct media_graph new = { .top = 0 };
627
628 /*
629 * Initialise the new graph walk before cleaning up
630 * the old one in order not to spoil the graph walk
631 * object of the media device if graph walk init fails.
632 */
633 ret = media_graph_walk_init(&new, mdev);
634 if (ret) {
635 mutex_unlock(&mdev->graph_mutex);
636 return ret;
637 }
638 media_graph_walk_cleanup(&mdev->pm_count_walk);
639 mdev->pm_count_walk = new;
640 }
641 mutex_unlock(&mdev->graph_mutex);
642
643 return 0;
644 }
645 EXPORT_SYMBOL_GPL(media_device_register_entity);
646
__media_device_unregister_entity(struct media_entity * entity)647 static void __media_device_unregister_entity(struct media_entity *entity)
648 {
649 struct media_device *mdev = entity->graph_obj.mdev;
650 struct media_link *link, *tmp;
651 struct media_interface *intf;
652 unsigned int i;
653
654 ida_free(&mdev->entity_internal_idx, entity->internal_idx);
655
656 /* Remove all interface links pointing to this entity */
657 list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) {
658 list_for_each_entry_safe(link, tmp, &intf->links, list) {
659 if (link->entity == entity)
660 __media_remove_intf_link(link);
661 }
662 }
663
664 /* Remove all data links that belong to this entity */
665 __media_entity_remove_links(entity);
666
667 /* Remove all pads that belong to this entity */
668 for (i = 0; i < entity->num_pads; i++)
669 media_gobj_destroy(&entity->pads[i].graph_obj);
670
671 /* Remove the entity */
672 media_gobj_destroy(&entity->graph_obj);
673
674 /* invoke entity_notify callbacks to handle entity removal?? */
675
676 entity->graph_obj.mdev = NULL;
677 }
678
media_device_unregister_entity(struct media_entity * entity)679 void media_device_unregister_entity(struct media_entity *entity)
680 {
681 struct media_device *mdev = entity->graph_obj.mdev;
682
683 if (mdev == NULL)
684 return;
685
686 mutex_lock(&mdev->graph_mutex);
687 __media_device_unregister_entity(entity);
688 mutex_unlock(&mdev->graph_mutex);
689 }
690 EXPORT_SYMBOL_GPL(media_device_unregister_entity);
691
692 /**
693 * media_device_init() - initialize a media device
694 * @mdev: The media device
695 *
696 * The caller is responsible for initializing the media device before
697 * registration. The following fields must be set:
698 *
699 * - dev must point to the parent device
700 * - model must be filled with the device model name
701 */
media_device_init(struct media_device * mdev)702 void media_device_init(struct media_device *mdev)
703 {
704 INIT_LIST_HEAD(&mdev->entities);
705 INIT_LIST_HEAD(&mdev->interfaces);
706 INIT_LIST_HEAD(&mdev->pads);
707 INIT_LIST_HEAD(&mdev->links);
708 INIT_LIST_HEAD(&mdev->entity_notify);
709
710 mutex_init(&mdev->req_queue_mutex);
711 mutex_init(&mdev->graph_mutex);
712 ida_init(&mdev->entity_internal_idx);
713
714 atomic_set(&mdev->request_id, 0);
715
716 dev_dbg(mdev->dev, "Media device initialized\n");
717 }
718 EXPORT_SYMBOL_GPL(media_device_init);
719
media_device_cleanup(struct media_device * mdev)720 void media_device_cleanup(struct media_device *mdev)
721 {
722 ida_destroy(&mdev->entity_internal_idx);
723 mdev->entity_internal_idx_max = 0;
724 media_graph_walk_cleanup(&mdev->pm_count_walk);
725 mutex_destroy(&mdev->graph_mutex);
726 mutex_destroy(&mdev->req_queue_mutex);
727 }
728 EXPORT_SYMBOL_GPL(media_device_cleanup);
729
__media_device_register(struct media_device * mdev,struct module * owner)730 int __must_check __media_device_register(struct media_device *mdev,
731 struct module *owner)
732 {
733 struct media_devnode *devnode;
734 int ret;
735
736 devnode = kzalloc(sizeof(*devnode), GFP_KERNEL);
737 if (!devnode)
738 return -ENOMEM;
739
740 /* Register the device node. */
741 mdev->devnode = devnode;
742 devnode->fops = &media_device_fops;
743 devnode->parent = mdev->dev;
744 devnode->release = media_device_release;
745
746 /* Set version 0 to indicate user-space that the graph is static */
747 mdev->topology_version = 0;
748
749 ret = media_devnode_register(mdev, devnode, owner);
750 if (ret < 0) {
751 /* devnode free is handled in media_devnode_*() */
752 mdev->devnode = NULL;
753 return ret;
754 }
755
756 ret = device_create_file(&devnode->dev, &dev_attr_model);
757 if (ret < 0) {
758 /* devnode free is handled in media_devnode_*() */
759 mdev->devnode = NULL;
760 media_devnode_unregister_prepare(devnode);
761 media_devnode_unregister(devnode);
762 return ret;
763 }
764
765 dev_dbg(mdev->dev, "Media device registered\n");
766
767 return 0;
768 }
769 EXPORT_SYMBOL_GPL(__media_device_register);
770
media_device_register_entity_notify(struct media_device * mdev,struct media_entity_notify * nptr)771 int __must_check media_device_register_entity_notify(struct media_device *mdev,
772 struct media_entity_notify *nptr)
773 {
774 mutex_lock(&mdev->graph_mutex);
775 list_add_tail(&nptr->list, &mdev->entity_notify);
776 mutex_unlock(&mdev->graph_mutex);
777 return 0;
778 }
779 EXPORT_SYMBOL_GPL(media_device_register_entity_notify);
780
781 /*
782 * Note: Should be called with mdev->lock held.
783 */
__media_device_unregister_entity_notify(struct media_device * mdev,struct media_entity_notify * nptr)784 static void __media_device_unregister_entity_notify(struct media_device *mdev,
785 struct media_entity_notify *nptr)
786 {
787 list_del(&nptr->list);
788 }
789
media_device_unregister_entity_notify(struct media_device * mdev,struct media_entity_notify * nptr)790 void media_device_unregister_entity_notify(struct media_device *mdev,
791 struct media_entity_notify *nptr)
792 {
793 mutex_lock(&mdev->graph_mutex);
794 __media_device_unregister_entity_notify(mdev, nptr);
795 mutex_unlock(&mdev->graph_mutex);
796 }
797 EXPORT_SYMBOL_GPL(media_device_unregister_entity_notify);
798
media_device_unregister(struct media_device * mdev)799 void media_device_unregister(struct media_device *mdev)
800 {
801 struct media_entity *entity;
802 struct media_entity *next;
803 struct media_interface *intf, *tmp_intf;
804 struct media_entity_notify *notify, *nextp;
805
806 if (mdev == NULL)
807 return;
808
809 mutex_lock(&mdev->graph_mutex);
810
811 /* Check if mdev was ever registered at all */
812 if (!media_devnode_is_registered(mdev->devnode)) {
813 mutex_unlock(&mdev->graph_mutex);
814 return;
815 }
816
817 /* Clear the devnode register bit to avoid races with media dev open */
818 media_devnode_unregister_prepare(mdev->devnode);
819
820 /* Remove all entities from the media device */
821 list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list)
822 __media_device_unregister_entity(entity);
823
824 /* Remove all entity_notify callbacks from the media device */
825 list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list)
826 __media_device_unregister_entity_notify(mdev, notify);
827
828 /* Remove all interfaces from the media device */
829 list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces,
830 graph_obj.list) {
831 /*
832 * Unlink the interface, but don't free it here; the
833 * module which created it is responsible for freeing
834 * it
835 */
836 __media_remove_intf_links(intf);
837 media_gobj_destroy(&intf->graph_obj);
838 }
839
840 mutex_unlock(&mdev->graph_mutex);
841
842 dev_dbg(mdev->dev, "Media device unregistered\n");
843
844 device_remove_file(&mdev->devnode->dev, &dev_attr_model);
845 media_devnode_unregister(mdev->devnode);
846 /* devnode free is handled in media_devnode_*() */
847 mdev->devnode = NULL;
848 }
849 EXPORT_SYMBOL_GPL(media_device_unregister);
850
851 #if IS_ENABLED(CONFIG_PCI)
media_device_pci_init(struct media_device * mdev,struct pci_dev * pci_dev,const char * name)852 void media_device_pci_init(struct media_device *mdev,
853 struct pci_dev *pci_dev,
854 const char *name)
855 {
856 mdev->dev = &pci_dev->dev;
857
858 if (name)
859 strscpy(mdev->model, name, sizeof(mdev->model));
860 else
861 strscpy(mdev->model, pci_name(pci_dev), sizeof(mdev->model));
862
863 sprintf(mdev->bus_info, "PCI:%s", pci_name(pci_dev));
864
865 mdev->hw_revision = (pci_dev->subsystem_vendor << 16)
866 | pci_dev->subsystem_device;
867
868 media_device_init(mdev);
869 }
870 EXPORT_SYMBOL_GPL(media_device_pci_init);
871 #endif
872
873 #if IS_ENABLED(CONFIG_USB)
__media_device_usb_init(struct media_device * mdev,struct usb_device * udev,const char * board_name,const char * driver_name)874 void __media_device_usb_init(struct media_device *mdev,
875 struct usb_device *udev,
876 const char *board_name,
877 const char *driver_name)
878 {
879 mdev->dev = &udev->dev;
880
881 if (driver_name)
882 strscpy(mdev->driver_name, driver_name,
883 sizeof(mdev->driver_name));
884
885 if (board_name)
886 strscpy(mdev->model, board_name, sizeof(mdev->model));
887 else if (udev->product)
888 strscpy(mdev->model, udev->product, sizeof(mdev->model));
889 else
890 strscpy(mdev->model, "unknown model", sizeof(mdev->model));
891 if (udev->serial)
892 strscpy(mdev->serial, udev->serial, sizeof(mdev->serial));
893 usb_make_path(udev, mdev->bus_info, sizeof(mdev->bus_info));
894 mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
895
896 media_device_init(mdev);
897 }
898 EXPORT_SYMBOL_GPL(__media_device_usb_init);
899 #endif
900
901
902 #endif /* CONFIG_MEDIA_CONTROLLER */
903