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 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23 /* We need to access legacy defines from linux/media.h */
24 #define __NEED_MEDIA_LEGACY_API
25
26 #include <linux/compat.h>
27 #include <linux/export.h>
28 #include <linux/idr.h>
29 #include <linux/ioctl.h>
30 #include <linux/media.h>
31 #include <linux/slab.h>
32 #include <linux/types.h>
33 #include <linux/pci.h>
34 #include <linux/usb.h>
35
36 #include <media/media-device.h>
37 #include <media/media-devnode.h>
38 #include <media/media-entity.h>
39
40 #ifdef CONFIG_MEDIA_CONTROLLER
41
42 /* -----------------------------------------------------------------------------
43 * Userspace API
44 */
45
media_get_uptr(__u64 arg)46 static inline void __user *media_get_uptr(__u64 arg)
47 {
48 return (void __user *)(uintptr_t)arg;
49 }
50
media_device_open(struct file * filp)51 static int media_device_open(struct file *filp)
52 {
53 return 0;
54 }
55
media_device_close(struct file * filp)56 static int media_device_close(struct file *filp)
57 {
58 return 0;
59 }
60
media_device_get_info(struct media_device * dev,void * arg)61 static long media_device_get_info(struct media_device *dev, void *arg)
62 {
63 struct media_device_info *info = (struct media_device_info *)arg;
64
65 memset(info, 0, sizeof(*info));
66
67 if (dev->driver_name[0])
68 strlcpy(info->driver, dev->driver_name, sizeof(info->driver));
69 else
70 strlcpy(info->driver, dev->dev->driver->name,
71 sizeof(info->driver));
72
73 strlcpy(info->model, dev->model, sizeof(info->model));
74 strlcpy(info->serial, dev->serial, sizeof(info->serial));
75 strlcpy(info->bus_info, dev->bus_info, sizeof(info->bus_info));
76
77 info->media_version = MEDIA_API_VERSION;
78 info->hw_revision = dev->hw_revision;
79 info->driver_version = dev->driver_version;
80
81 return 0;
82 }
83
find_entity(struct media_device * mdev,u32 id)84 static struct media_entity *find_entity(struct media_device *mdev, u32 id)
85 {
86 struct media_entity *entity;
87 int next = id & MEDIA_ENT_ID_FLAG_NEXT;
88
89 id &= ~MEDIA_ENT_ID_FLAG_NEXT;
90
91 media_device_for_each_entity(entity, mdev) {
92 if (((media_entity_id(entity) == id) && !next) ||
93 ((media_entity_id(entity) > id) && next)) {
94 return entity;
95 }
96 }
97
98 return NULL;
99 }
100
media_device_enum_entities(struct media_device * mdev,void * arg)101 static long media_device_enum_entities(struct media_device *mdev, void *arg)
102 {
103 struct media_entity_desc *entd = (struct media_entity_desc *)arg;
104 struct media_entity *ent;
105
106 ent = find_entity(mdev, entd->id);
107 if (ent == NULL)
108 return -EINVAL;
109
110 memset(entd, 0, sizeof(*entd));
111
112 entd->id = media_entity_id(ent);
113 if (ent->name)
114 strlcpy(entd->name, ent->name, sizeof(entd->name));
115 entd->type = ent->function;
116 entd->revision = 0; /* Unused */
117 entd->flags = ent->flags;
118 entd->group_id = 0; /* Unused */
119 entd->pads = ent->num_pads;
120 entd->links = ent->num_links - ent->num_backlinks;
121
122 /*
123 * Workaround for a bug at media-ctl <= v1.10 that makes it to
124 * do the wrong thing if the entity function doesn't belong to
125 * either MEDIA_ENT_F_OLD_BASE or MEDIA_ENT_F_OLD_SUBDEV_BASE
126 * Ranges.
127 *
128 * Non-subdevices are expected to be at the MEDIA_ENT_F_OLD_BASE,
129 * or, otherwise, will be silently ignored by media-ctl when
130 * printing the graphviz diagram. So, map them into the devnode
131 * old range.
132 */
133 if (ent->function < MEDIA_ENT_F_OLD_BASE ||
134 ent->function > MEDIA_ENT_F_TUNER) {
135 if (is_media_entity_v4l2_subdev(ent))
136 entd->type = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
137 else if (ent->function != MEDIA_ENT_F_IO_V4L)
138 entd->type = MEDIA_ENT_T_DEVNODE_UNKNOWN;
139 }
140
141 memcpy(&entd->raw, &ent->info, sizeof(ent->info));
142
143 return 0;
144 }
145
media_device_kpad_to_upad(const struct media_pad * kpad,struct media_pad_desc * upad)146 static void media_device_kpad_to_upad(const struct media_pad *kpad,
147 struct media_pad_desc *upad)
148 {
149 upad->entity = media_entity_id(kpad->entity);
150 upad->index = kpad->index;
151 upad->flags = kpad->flags;
152 }
153
media_device_enum_links(struct media_device * mdev,void * arg)154 static long media_device_enum_links(struct media_device *mdev, void *arg)
155 {
156 struct media_links_enum *links = (struct media_links_enum *)arg;
157 struct media_entity *entity;
158
159 entity = find_entity(mdev, links->entity);
160 if (entity == NULL)
161 return -EINVAL;
162
163 if (links->pads) {
164 unsigned int p;
165
166 for (p = 0; p < entity->num_pads; p++) {
167 struct media_pad_desc pad;
168
169 memset(&pad, 0, sizeof(pad));
170 media_device_kpad_to_upad(&entity->pads[p], &pad);
171 if (copy_to_user(&links->pads[p], &pad, sizeof(pad)))
172 return -EFAULT;
173 }
174 }
175
176 if (links->links) {
177 struct media_link *link;
178 struct media_link_desc __user *ulink_desc = links->links;
179
180 list_for_each_entry(link, &entity->links, list) {
181 struct media_link_desc klink_desc;
182
183 /* Ignore backlinks. */
184 if (link->source->entity != entity)
185 continue;
186 memset(&klink_desc, 0, sizeof(klink_desc));
187 media_device_kpad_to_upad(link->source,
188 &klink_desc.source);
189 media_device_kpad_to_upad(link->sink,
190 &klink_desc.sink);
191 klink_desc.flags = link->flags;
192 if (copy_to_user(ulink_desc, &klink_desc,
193 sizeof(*ulink_desc)))
194 return -EFAULT;
195 ulink_desc++;
196 }
197 }
198
199 return 0;
200 }
201
media_device_setup_link(struct media_device * mdev,void * arg)202 static long media_device_setup_link(struct media_device *mdev, void *arg)
203 {
204 struct media_link_desc *linkd = (struct media_link_desc *)arg;
205 struct media_link *link = NULL;
206 struct media_entity *source;
207 struct media_entity *sink;
208
209 /* Find the source and sink entities and link.
210 */
211 source = find_entity(mdev, linkd->source.entity);
212 sink = find_entity(mdev, linkd->sink.entity);
213
214 if (source == NULL || sink == NULL)
215 return -EINVAL;
216
217 if (linkd->source.index >= source->num_pads ||
218 linkd->sink.index >= sink->num_pads)
219 return -EINVAL;
220
221 link = media_entity_find_link(&source->pads[linkd->source.index],
222 &sink->pads[linkd->sink.index]);
223 if (link == NULL)
224 return -EINVAL;
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 = (struct media_v2_topology *)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 strncpy(kentity.name, entity->name,
264 sizeof(kentity.name));
265
266 if (copy_to_user(uentity, &kentity, sizeof(kentity)))
267 ret = -EFAULT;
268 uentity++;
269 }
270 topo->num_entities = i;
271
272 /* Get interfaces and number of interfaces */
273 i = 0;
274 uintf = media_get_uptr(topo->ptr_interfaces);
275 media_device_for_each_intf(intf, mdev) {
276 i++;
277 if (ret || !uintf)
278 continue;
279
280 if (i > topo->num_interfaces) {
281 ret = -ENOSPC;
282 continue;
283 }
284
285 memset(&kintf, 0, sizeof(kintf));
286
287 /* Copy intf fields to userspace struct */
288 kintf.id = intf->graph_obj.id;
289 kintf.intf_type = intf->type;
290 kintf.flags = intf->flags;
291
292 if (media_type(&intf->graph_obj) == MEDIA_GRAPH_INTF_DEVNODE) {
293 struct media_intf_devnode *devnode;
294
295 devnode = intf_to_devnode(intf);
296
297 kintf.devnode.major = devnode->major;
298 kintf.devnode.minor = devnode->minor;
299 }
300
301 if (copy_to_user(uintf, &kintf, sizeof(kintf)))
302 ret = -EFAULT;
303 uintf++;
304 }
305 topo->num_interfaces = i;
306
307 /* Get pads and number of pads */
308 i = 0;
309 upad = media_get_uptr(topo->ptr_pads);
310 media_device_for_each_pad(pad, mdev) {
311 i++;
312 if (ret || !upad)
313 continue;
314
315 if (i > topo->num_pads) {
316 ret = -ENOSPC;
317 continue;
318 }
319
320 memset(&kpad, 0, sizeof(kpad));
321
322 /* Copy pad fields to userspace struct */
323 kpad.id = pad->graph_obj.id;
324 kpad.entity_id = pad->entity->graph_obj.id;
325 kpad.flags = pad->flags;
326
327 if (copy_to_user(upad, &kpad, sizeof(kpad)))
328 ret = -EFAULT;
329 upad++;
330 }
331 topo->num_pads = i;
332
333 /* Get links and number of links */
334 i = 0;
335 ulink = media_get_uptr(topo->ptr_links);
336 media_device_for_each_link(link, mdev) {
337 if (link->is_backlink)
338 continue;
339
340 i++;
341
342 if (ret || !ulink)
343 continue;
344
345 if (i > topo->num_links) {
346 ret = -ENOSPC;
347 continue;
348 }
349
350 memset(&klink, 0, sizeof(klink));
351
352 /* Copy link fields to userspace struct */
353 klink.id = link->graph_obj.id;
354 klink.source_id = link->gobj0->id;
355 klink.sink_id = link->gobj1->id;
356 klink.flags = link->flags;
357
358 if (copy_to_user(ulink, &klink, sizeof(klink)))
359 ret = -EFAULT;
360 ulink++;
361 }
362 topo->num_links = i;
363
364 return ret;
365 }
366
copy_arg_from_user(void * karg,void __user * uarg,unsigned int cmd)367 static long copy_arg_from_user(void *karg, void __user *uarg, unsigned int cmd)
368 {
369 /* All media IOCTLs are _IOWR() */
370 if (copy_from_user(karg, uarg, _IOC_SIZE(cmd)))
371 return -EFAULT;
372
373 return 0;
374 }
375
copy_arg_to_user(void __user * uarg,void * karg,unsigned int cmd)376 static long copy_arg_to_user(void __user *uarg, void *karg, unsigned int cmd)
377 {
378 /* All media IOCTLs are _IOWR() */
379 if (copy_to_user(uarg, karg, _IOC_SIZE(cmd)))
380 return -EFAULT;
381
382 return 0;
383 }
384
385 /* Do acquire the graph mutex */
386 #define MEDIA_IOC_FL_GRAPH_MUTEX BIT(0)
387
388 #define MEDIA_IOC_ARG(__cmd, func, fl, from_user, to_user) \
389 [_IOC_NR(MEDIA_IOC_##__cmd)] = { \
390 .cmd = MEDIA_IOC_##__cmd, \
391 .fn = (long (*)(struct media_device *, void *))func, \
392 .flags = fl, \
393 .arg_from_user = from_user, \
394 .arg_to_user = to_user, \
395 }
396
397 #define MEDIA_IOC(__cmd, func, fl) \
398 MEDIA_IOC_ARG(__cmd, func, fl, copy_arg_from_user, copy_arg_to_user)
399
400 /* the table is indexed by _IOC_NR(cmd) */
401 struct media_ioctl_info {
402 unsigned int cmd;
403 unsigned short flags;
404 long (*fn)(struct media_device *dev, void *arg);
405 long (*arg_from_user)(void *karg, void __user *uarg, unsigned int cmd);
406 long (*arg_to_user)(void __user *uarg, void *karg, unsigned int cmd);
407 };
408
409 static const struct media_ioctl_info ioctl_info[] = {
410 MEDIA_IOC(DEVICE_INFO, media_device_get_info, MEDIA_IOC_FL_GRAPH_MUTEX),
411 MEDIA_IOC(ENUM_ENTITIES, media_device_enum_entities, MEDIA_IOC_FL_GRAPH_MUTEX),
412 MEDIA_IOC(ENUM_LINKS, media_device_enum_links, MEDIA_IOC_FL_GRAPH_MUTEX),
413 MEDIA_IOC(SETUP_LINK, media_device_setup_link, MEDIA_IOC_FL_GRAPH_MUTEX),
414 MEDIA_IOC(G_TOPOLOGY, media_device_get_topology, MEDIA_IOC_FL_GRAPH_MUTEX),
415 };
416
media_device_ioctl(struct file * filp,unsigned int cmd,unsigned long __arg)417 static long media_device_ioctl(struct file *filp, unsigned int cmd,
418 unsigned long __arg)
419 {
420 struct media_devnode *devnode = media_devnode_data(filp);
421 struct media_device *dev = devnode->media_dev;
422 const struct media_ioctl_info *info;
423 void __user *arg = (void __user *)__arg;
424 char __karg[256], *karg = __karg;
425 long ret;
426
427 if (_IOC_NR(cmd) >= ARRAY_SIZE(ioctl_info)
428 || ioctl_info[_IOC_NR(cmd)].cmd != cmd)
429 return -ENOIOCTLCMD;
430
431 info = &ioctl_info[_IOC_NR(cmd)];
432
433 if (_IOC_SIZE(info->cmd) > sizeof(__karg)) {
434 karg = kmalloc(_IOC_SIZE(info->cmd), GFP_KERNEL);
435 if (!karg)
436 return -ENOMEM;
437 }
438
439 if (info->arg_from_user) {
440 ret = info->arg_from_user(karg, arg, cmd);
441 if (ret)
442 goto out_free;
443 }
444
445 if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
446 mutex_lock(&dev->graph_mutex);
447
448 ret = info->fn(dev, karg);
449
450 if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
451 mutex_unlock(&dev->graph_mutex);
452
453 if (!ret && info->arg_to_user)
454 ret = info->arg_to_user(arg, karg, cmd);
455
456 out_free:
457 if (karg != __karg)
458 kfree(karg);
459
460 return ret;
461 }
462
463 #ifdef CONFIG_COMPAT
464
465 struct media_links_enum32 {
466 __u32 entity;
467 compat_uptr_t pads; /* struct media_pad_desc * */
468 compat_uptr_t links; /* struct media_link_desc * */
469 __u32 reserved[4];
470 };
471
media_device_enum_links32(struct media_device * mdev,struct media_links_enum32 __user * ulinks)472 static long media_device_enum_links32(struct media_device *mdev,
473 struct media_links_enum32 __user *ulinks)
474 {
475 struct media_links_enum links;
476 compat_uptr_t pads_ptr, links_ptr;
477
478 memset(&links, 0, sizeof(links));
479
480 if (get_user(links.entity, &ulinks->entity)
481 || get_user(pads_ptr, &ulinks->pads)
482 || get_user(links_ptr, &ulinks->links))
483 return -EFAULT;
484
485 links.pads = compat_ptr(pads_ptr);
486 links.links = compat_ptr(links_ptr);
487
488 return media_device_enum_links(mdev, &links);
489 }
490
491 #define MEDIA_IOC_ENUM_LINKS32 _IOWR('|', 0x02, struct media_links_enum32)
492
media_device_compat_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)493 static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
494 unsigned long arg)
495 {
496 struct media_devnode *devnode = media_devnode_data(filp);
497 struct media_device *dev = devnode->media_dev;
498 long ret;
499
500 switch (cmd) {
501 case MEDIA_IOC_ENUM_LINKS32:
502 mutex_lock(&dev->graph_mutex);
503 ret = media_device_enum_links32(dev,
504 (struct media_links_enum32 __user *)arg);
505 mutex_unlock(&dev->graph_mutex);
506 break;
507
508 default:
509 return media_device_ioctl(filp, cmd, arg);
510 }
511
512 return ret;
513 }
514 #endif /* CONFIG_COMPAT */
515
516 static const struct media_file_operations media_device_fops = {
517 .owner = THIS_MODULE,
518 .open = media_device_open,
519 .ioctl = media_device_ioctl,
520 #ifdef CONFIG_COMPAT
521 .compat_ioctl = media_device_compat_ioctl,
522 #endif /* CONFIG_COMPAT */
523 .release = media_device_close,
524 };
525
526 /* -----------------------------------------------------------------------------
527 * sysfs
528 */
529
show_model(struct device * cd,struct device_attribute * attr,char * buf)530 static ssize_t show_model(struct device *cd,
531 struct device_attribute *attr, char *buf)
532 {
533 struct media_devnode *devnode = to_media_devnode(cd);
534 struct media_device *mdev = devnode->media_dev;
535
536 return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
537 }
538
539 static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
540
541 /* -----------------------------------------------------------------------------
542 * Registration/unregistration
543 */
544
media_device_release(struct media_devnode * mdev)545 static void media_device_release(struct media_devnode *mdev)
546 {
547 dev_dbg(mdev->parent, "Media device released\n");
548 }
549
550 /**
551 * media_device_register_entity - Register an entity with a media device
552 * @mdev: The media device
553 * @entity: The entity
554 */
media_device_register_entity(struct media_device * mdev,struct media_entity * entity)555 int __must_check media_device_register_entity(struct media_device *mdev,
556 struct media_entity *entity)
557 {
558 struct media_entity_notify *notify, *next;
559 unsigned int i;
560 int ret;
561
562 if (entity->function == MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN ||
563 entity->function == MEDIA_ENT_F_UNKNOWN)
564 dev_warn(mdev->dev,
565 "Entity type for entity %s was not initialized!\n",
566 entity->name);
567
568 /* Warn if we apparently re-register an entity */
569 WARN_ON(entity->graph_obj.mdev != NULL);
570 entity->graph_obj.mdev = mdev;
571 INIT_LIST_HEAD(&entity->links);
572 entity->num_links = 0;
573 entity->num_backlinks = 0;
574
575 if (!ida_pre_get(&mdev->entity_internal_idx, GFP_KERNEL))
576 return -ENOMEM;
577
578 mutex_lock(&mdev->graph_mutex);
579
580 ret = ida_get_new_above(&mdev->entity_internal_idx, 1,
581 &entity->internal_idx);
582 if (ret < 0) {
583 mutex_unlock(&mdev->graph_mutex);
584 return ret;
585 }
586
587 mdev->entity_internal_idx_max =
588 max(mdev->entity_internal_idx_max, entity->internal_idx);
589
590 /* Initialize media_gobj embedded at the entity */
591 media_gobj_create(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
592
593 /* Initialize objects at the pads */
594 for (i = 0; i < entity->num_pads; i++)
595 media_gobj_create(mdev, MEDIA_GRAPH_PAD,
596 &entity->pads[i].graph_obj);
597
598 /* invoke entity_notify callbacks */
599 list_for_each_entry_safe(notify, next, &mdev->entity_notify, list) {
600 (notify)->notify(entity, notify->notify_data);
601 }
602
603 if (mdev->entity_internal_idx_max
604 >= mdev->pm_count_walk.ent_enum.idx_max) {
605 struct media_entity_graph new = { .top = 0 };
606
607 /*
608 * Initialise the new graph walk before cleaning up
609 * the old one in order not to spoil the graph walk
610 * object of the media device if graph walk init fails.
611 */
612 ret = media_entity_graph_walk_init(&new, mdev);
613 if (ret) {
614 mutex_unlock(&mdev->graph_mutex);
615 return ret;
616 }
617 media_entity_graph_walk_cleanup(&mdev->pm_count_walk);
618 mdev->pm_count_walk = new;
619 }
620 mutex_unlock(&mdev->graph_mutex);
621
622 return 0;
623 }
624 EXPORT_SYMBOL_GPL(media_device_register_entity);
625
__media_device_unregister_entity(struct media_entity * entity)626 static void __media_device_unregister_entity(struct media_entity *entity)
627 {
628 struct media_device *mdev = entity->graph_obj.mdev;
629 struct media_link *link, *tmp;
630 struct media_interface *intf;
631 unsigned int i;
632
633 ida_simple_remove(&mdev->entity_internal_idx, entity->internal_idx);
634
635 /* Remove all interface links pointing to this entity */
636 list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) {
637 list_for_each_entry_safe(link, tmp, &intf->links, list) {
638 if (link->entity == entity)
639 __media_remove_intf_link(link);
640 }
641 }
642
643 /* Remove all data links that belong to this entity */
644 __media_entity_remove_links(entity);
645
646 /* Remove all pads that belong to this entity */
647 for (i = 0; i < entity->num_pads; i++)
648 media_gobj_destroy(&entity->pads[i].graph_obj);
649
650 /* Remove the entity */
651 media_gobj_destroy(&entity->graph_obj);
652
653 /* invoke entity_notify callbacks to handle entity removal?? */
654
655 entity->graph_obj.mdev = NULL;
656 }
657
media_device_unregister_entity(struct media_entity * entity)658 void media_device_unregister_entity(struct media_entity *entity)
659 {
660 struct media_device *mdev = entity->graph_obj.mdev;
661
662 if (mdev == NULL)
663 return;
664
665 mutex_lock(&mdev->graph_mutex);
666 __media_device_unregister_entity(entity);
667 mutex_unlock(&mdev->graph_mutex);
668 }
669 EXPORT_SYMBOL_GPL(media_device_unregister_entity);
670
671 /**
672 * media_device_init() - initialize a media device
673 * @mdev: The media device
674 *
675 * The caller is responsible for initializing the media device before
676 * registration. The following fields must be set:
677 *
678 * - dev must point to the parent device
679 * - model must be filled with the device model name
680 */
media_device_init(struct media_device * mdev)681 void media_device_init(struct media_device *mdev)
682 {
683 INIT_LIST_HEAD(&mdev->entities);
684 INIT_LIST_HEAD(&mdev->interfaces);
685 INIT_LIST_HEAD(&mdev->pads);
686 INIT_LIST_HEAD(&mdev->links);
687 INIT_LIST_HEAD(&mdev->entity_notify);
688 mutex_init(&mdev->graph_mutex);
689 ida_init(&mdev->entity_internal_idx);
690
691 dev_dbg(mdev->dev, "Media device initialized\n");
692 }
693 EXPORT_SYMBOL_GPL(media_device_init);
694
media_device_cleanup(struct media_device * mdev)695 void media_device_cleanup(struct media_device *mdev)
696 {
697 ida_destroy(&mdev->entity_internal_idx);
698 mdev->entity_internal_idx_max = 0;
699 media_entity_graph_walk_cleanup(&mdev->pm_count_walk);
700 mutex_destroy(&mdev->graph_mutex);
701 }
702 EXPORT_SYMBOL_GPL(media_device_cleanup);
703
__media_device_register(struct media_device * mdev,struct module * owner)704 int __must_check __media_device_register(struct media_device *mdev,
705 struct module *owner)
706 {
707 struct media_devnode *devnode;
708 int ret;
709
710 devnode = kzalloc(sizeof(*devnode), GFP_KERNEL);
711 if (!devnode)
712 return -ENOMEM;
713
714 /* Register the device node. */
715 mdev->devnode = devnode;
716 devnode->fops = &media_device_fops;
717 devnode->parent = mdev->dev;
718 devnode->release = media_device_release;
719
720 /* Set version 0 to indicate user-space that the graph is static */
721 mdev->topology_version = 0;
722
723 ret = media_devnode_register(mdev, devnode, owner);
724 if (ret < 0) {
725 /* devnode free is handled in media_devnode_*() */
726 mdev->devnode = NULL;
727 return ret;
728 }
729
730 ret = device_create_file(&devnode->dev, &dev_attr_model);
731 if (ret < 0) {
732 /* devnode free is handled in media_devnode_*() */
733 mdev->devnode = NULL;
734 media_devnode_unregister_prepare(devnode);
735 media_devnode_unregister(devnode);
736 return ret;
737 }
738
739 dev_dbg(mdev->dev, "Media device registered\n");
740
741 return 0;
742 }
743 EXPORT_SYMBOL_GPL(__media_device_register);
744
media_device_register_entity_notify(struct media_device * mdev,struct media_entity_notify * nptr)745 int __must_check media_device_register_entity_notify(struct media_device *mdev,
746 struct media_entity_notify *nptr)
747 {
748 mutex_lock(&mdev->graph_mutex);
749 list_add_tail(&nptr->list, &mdev->entity_notify);
750 mutex_unlock(&mdev->graph_mutex);
751 return 0;
752 }
753 EXPORT_SYMBOL_GPL(media_device_register_entity_notify);
754
755 /*
756 * Note: Should be called with mdev->lock held.
757 */
__media_device_unregister_entity_notify(struct media_device * mdev,struct media_entity_notify * nptr)758 static void __media_device_unregister_entity_notify(struct media_device *mdev,
759 struct media_entity_notify *nptr)
760 {
761 list_del(&nptr->list);
762 }
763
media_device_unregister_entity_notify(struct media_device * mdev,struct media_entity_notify * nptr)764 void media_device_unregister_entity_notify(struct media_device *mdev,
765 struct media_entity_notify *nptr)
766 {
767 mutex_lock(&mdev->graph_mutex);
768 __media_device_unregister_entity_notify(mdev, nptr);
769 mutex_unlock(&mdev->graph_mutex);
770 }
771 EXPORT_SYMBOL_GPL(media_device_unregister_entity_notify);
772
media_device_unregister(struct media_device * mdev)773 void media_device_unregister(struct media_device *mdev)
774 {
775 struct media_entity *entity;
776 struct media_entity *next;
777 struct media_interface *intf, *tmp_intf;
778 struct media_entity_notify *notify, *nextp;
779
780 if (mdev == NULL)
781 return;
782
783 mutex_lock(&mdev->graph_mutex);
784
785 /* Check if mdev was ever registered at all */
786 if (!media_devnode_is_registered(mdev->devnode)) {
787 mutex_unlock(&mdev->graph_mutex);
788 return;
789 }
790
791 /* Clear the devnode register bit to avoid races with media dev open */
792 media_devnode_unregister_prepare(mdev->devnode);
793
794 /* Remove all entities from the media device */
795 list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list)
796 __media_device_unregister_entity(entity);
797
798 /* Remove all entity_notify callbacks from the media device */
799 list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list)
800 __media_device_unregister_entity_notify(mdev, notify);
801
802 /* Remove all interfaces from the media device */
803 list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces,
804 graph_obj.list) {
805 __media_remove_intf_links(intf);
806 media_gobj_destroy(&intf->graph_obj);
807 kfree(intf);
808 }
809
810 mutex_unlock(&mdev->graph_mutex);
811
812 dev_dbg(mdev->dev, "Media device unregistered\n");
813
814 device_remove_file(&mdev->devnode->dev, &dev_attr_model);
815 media_devnode_unregister(mdev->devnode);
816 /* devnode free is handled in media_devnode_*() */
817 mdev->devnode = NULL;
818 }
819 EXPORT_SYMBOL_GPL(media_device_unregister);
820
media_device_release_devres(struct device * dev,void * res)821 static void media_device_release_devres(struct device *dev, void *res)
822 {
823 }
824
media_device_get_devres(struct device * dev)825 struct media_device *media_device_get_devres(struct device *dev)
826 {
827 struct media_device *mdev;
828
829 mdev = devres_find(dev, media_device_release_devres, NULL, NULL);
830 if (mdev)
831 return mdev;
832
833 mdev = devres_alloc(media_device_release_devres,
834 sizeof(struct media_device), GFP_KERNEL);
835 if (!mdev)
836 return NULL;
837 return devres_get(dev, mdev, NULL, NULL);
838 }
839 EXPORT_SYMBOL_GPL(media_device_get_devres);
840
media_device_find_devres(struct device * dev)841 struct media_device *media_device_find_devres(struct device *dev)
842 {
843 return devres_find(dev, media_device_release_devres, NULL, NULL);
844 }
845 EXPORT_SYMBOL_GPL(media_device_find_devres);
846
847 #if IS_ENABLED(CONFIG_PCI)
media_device_pci_init(struct media_device * mdev,struct pci_dev * pci_dev,const char * name)848 void media_device_pci_init(struct media_device *mdev,
849 struct pci_dev *pci_dev,
850 const char *name)
851 {
852 mdev->dev = &pci_dev->dev;
853
854 if (name)
855 strlcpy(mdev->model, name, sizeof(mdev->model));
856 else
857 strlcpy(mdev->model, pci_name(pci_dev), sizeof(mdev->model));
858
859 sprintf(mdev->bus_info, "PCI:%s", pci_name(pci_dev));
860
861 mdev->hw_revision = (pci_dev->subsystem_vendor << 16)
862 | pci_dev->subsystem_device;
863
864 mdev->driver_version = LINUX_VERSION_CODE;
865
866 media_device_init(mdev);
867 }
868 EXPORT_SYMBOL_GPL(media_device_pci_init);
869 #endif
870
871 #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)872 void __media_device_usb_init(struct media_device *mdev,
873 struct usb_device *udev,
874 const char *board_name,
875 const char *driver_name)
876 {
877 mdev->dev = &udev->dev;
878
879 if (driver_name)
880 strlcpy(mdev->driver_name, driver_name,
881 sizeof(mdev->driver_name));
882
883 if (board_name)
884 strlcpy(mdev->model, board_name, sizeof(mdev->model));
885 else if (udev->product)
886 strlcpy(mdev->model, udev->product, sizeof(mdev->model));
887 else
888 strlcpy(mdev->model, "unknown model", sizeof(mdev->model));
889 if (udev->serial)
890 strlcpy(mdev->serial, udev->serial, sizeof(mdev->serial));
891 usb_make_path(udev, mdev->bus_info, sizeof(mdev->bus_info));
892 mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
893 mdev->driver_version = LINUX_VERSION_CODE;
894
895 media_device_init(mdev);
896 }
897 EXPORT_SYMBOL_GPL(__media_device_usb_init);
898 #endif
899
900
901 #endif /* CONFIG_MEDIA_CONTROLLER */
902