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,void * arg)373 static 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
copy_arg_from_user(void * karg,void __user * uarg,unsigned int cmd)383 static 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
copy_arg_to_user(void __user * uarg,void * karg,unsigned int cmd)392 static 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) */
417 struct 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
425 static 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
media_device_ioctl(struct file * filp,unsigned int cmd,unsigned long __arg)434 static 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
473 out_free:
474 if (karg != __karg)
475 kfree(karg);
476
477 return ret;
478 }
479
480 #ifdef CONFIG_COMPAT
481
482 struct 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
media_device_enum_links32(struct media_device * mdev,struct media_links_enum32 __user * ulinks)489 static 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
media_device_compat_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)518 static 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
541 static 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
model_show(struct device * cd,struct device_attribute * attr,char * buf)555 static 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
564 static DEVICE_ATTR_RO(model);
565
566 /* -----------------------------------------------------------------------------
567 * Registration/unregistration
568 */
569
media_device_release(struct media_devnode * devnode)570 static void media_device_release(struct media_devnode *devnode)
571 {
572 dev_dbg(devnode->parent, "Media device released\n");
573 }
574
__media_device_unregister_entity(struct media_entity * entity)575 static 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
media_device_register_entity(struct media_device * mdev,struct media_entity * entity)605 int __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 }
667 EXPORT_SYMBOL_GPL(media_device_register_entity);
668
media_device_unregister_entity(struct media_entity * entity)669 void 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 }
680 EXPORT_SYMBOL_GPL(media_device_unregister_entity);
681
media_device_init(struct media_device * mdev)682 void 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 }
702 EXPORT_SYMBOL_GPL(media_device_init);
703
media_device_cleanup(struct media_device * mdev)704 void 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 }
712 EXPORT_SYMBOL_GPL(media_device_cleanup);
713
__media_device_register(struct media_device * mdev,struct module * owner)714 int __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 }
753 EXPORT_SYMBOL_GPL(__media_device_register);
754
media_device_register_entity_notify(struct media_device * mdev,struct media_entity_notify * nptr)755 void 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 }
762 EXPORT_SYMBOL_GPL(media_device_register_entity_notify);
763
764 /*
765 * Note: Should be called with mdev->lock held.
766 */
__media_device_unregister_entity_notify(struct media_device * mdev,struct media_entity_notify * nptr)767 static void __media_device_unregister_entity_notify(struct media_device *mdev,
768 struct media_entity_notify *nptr)
769 {
770 list_del(&nptr->list);
771 }
772
media_device_unregister_entity_notify(struct media_device * mdev,struct media_entity_notify * nptr)773 void 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 }
780 EXPORT_SYMBOL_GPL(media_device_unregister_entity_notify);
781
media_device_unregister(struct media_device * mdev)782 void 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 }
832 EXPORT_SYMBOL_GPL(media_device_unregister);
833
834 #if IS_ENABLED(CONFIG_PCI)
media_device_pci_init(struct media_device * mdev,struct pci_dev * pci_dev,const char * name)835 void 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 }
853 EXPORT_SYMBOL_GPL(media_device_pci_init);
854 #endif
855
856 #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)857 void __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 }
881 EXPORT_SYMBOL_GPL(__media_device_usb_init);
882 #endif
883
884
885 #endif /* CONFIG_MEDIA_CONTROLLER */
886