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