blob: b3e19c22e699099ab2a5a20245b4fe6118f05cf3 [file] [log] [blame]
Laurent Pinchart176fb0d2009-12-09 08:39:58 -03001/*
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
Sakari Ailusb0a1f2a2013-01-22 12:27:56 -030023#include <linux/compat.h>
24#include <linux/export.h>
Laurent Pinchart176fb0d2009-12-09 08:39:58 -030025#include <linux/ioctl.h>
Laurent Pinchart140d8812010-08-18 11:41:22 -030026#include <linux/media.h>
Mauro Carvalho Chehab57208e52015-08-07 06:55:40 -030027#include <linux/slab.h>
Mauro Carvalho Chehab497e80c2015-12-11 07:23:09 -020028#include <linux/types.h>
Laurent Pinchart176fb0d2009-12-09 08:39:58 -030029
30#include <media/media-device.h>
31#include <media/media-devnode.h>
Laurent Pinchart53e269c2009-12-09 08:40:00 -030032#include <media/media-entity.h>
Laurent Pinchart176fb0d2009-12-09 08:39:58 -030033
Shuah Khane576d602015-06-05 17:11:54 -030034#ifdef CONFIG_MEDIA_CONTROLLER
35
Laurent Pinchart140d8812010-08-18 11:41:22 -030036/* -----------------------------------------------------------------------------
37 * Userspace API
38 */
39
40static int media_device_open(struct file *filp)
41{
42 return 0;
43}
44
45static int media_device_close(struct file *filp)
46{
47 return 0;
48}
49
50static int media_device_get_info(struct media_device *dev,
51 struct media_device_info __user *__info)
52{
53 struct media_device_info info;
54
55 memset(&info, 0, sizeof(info));
56
57 strlcpy(info.driver, dev->dev->driver->name, sizeof(info.driver));
58 strlcpy(info.model, dev->model, sizeof(info.model));
59 strlcpy(info.serial, dev->serial, sizeof(info.serial));
60 strlcpy(info.bus_info, dev->bus_info, sizeof(info.bus_info));
61
62 info.media_version = MEDIA_API_VERSION;
63 info.hw_revision = dev->hw_revision;
64 info.driver_version = dev->driver_version;
65
Nicolas THERYb17d3942012-08-07 05:24:59 -030066 if (copy_to_user(__info, &info, sizeof(*__info)))
67 return -EFAULT;
68 return 0;
Laurent Pinchart140d8812010-08-18 11:41:22 -030069}
70
Laurent Pinchart16513332009-12-09 08:40:01 -030071static struct media_entity *find_entity(struct media_device *mdev, u32 id)
72{
73 struct media_entity *entity;
74 int next = id & MEDIA_ENT_ID_FLAG_NEXT;
75
76 id &= ~MEDIA_ENT_ID_FLAG_NEXT;
77
78 spin_lock(&mdev->lock);
79
80 media_device_for_each_entity(entity, mdev) {
Mauro Carvalho Chehabfa762392015-08-14 10:42:05 -030081 if (((media_entity_id(entity) == id) && !next) ||
82 ((media_entity_id(entity) > id) && next)) {
Laurent Pinchart16513332009-12-09 08:40:01 -030083 spin_unlock(&mdev->lock);
84 return entity;
85 }
86 }
87
88 spin_unlock(&mdev->lock);
89
90 return NULL;
91}
92
93static long media_device_enum_entities(struct media_device *mdev,
94 struct media_entity_desc __user *uent)
95{
96 struct media_entity *ent;
97 struct media_entity_desc u_ent;
98
Salva Peiróe6a62342014-04-30 19:48:02 +020099 memset(&u_ent, 0, sizeof(u_ent));
Laurent Pinchart16513332009-12-09 08:40:01 -0300100 if (copy_from_user(&u_ent.id, &uent->id, sizeof(u_ent.id)))
101 return -EFAULT;
102
103 ent = find_entity(mdev, u_ent.id);
104
105 if (ent == NULL)
106 return -EINVAL;
107
Mauro Carvalho Chehabfa762392015-08-14 10:42:05 -0300108 u_ent.id = media_entity_id(ent);
Laurent Pinchartde8eae32014-07-17 08:52:08 -0300109 if (ent->name)
110 strlcpy(u_ent.name, ent->name, sizeof(u_ent.name));
Mauro Carvalho Chehab0e576b72015-09-06 09:33:39 -0300111 u_ent.type = ent->function;
Mauro Carvalho Chehab8ed8c882015-12-11 08:02:19 -0200112 u_ent.revision = 0; /* Unused */
Laurent Pinchart16513332009-12-09 08:40:01 -0300113 u_ent.flags = ent->flags;
Mauro Carvalho Chehab8ed8c882015-12-11 08:02:19 -0200114 u_ent.group_id = 0; /* Unused */
Laurent Pinchart16513332009-12-09 08:40:01 -0300115 u_ent.pads = ent->num_pads;
116 u_ent.links = ent->num_links - ent->num_backlinks;
Clemens Ladischfa5034c2011-11-05 18:42:01 -0300117 memcpy(&u_ent.raw, &ent->info, sizeof(ent->info));
Laurent Pinchart16513332009-12-09 08:40:01 -0300118 if (copy_to_user(uent, &u_ent, sizeof(u_ent)))
119 return -EFAULT;
120 return 0;
121}
122
123static void media_device_kpad_to_upad(const struct media_pad *kpad,
124 struct media_pad_desc *upad)
125{
Mauro Carvalho Chehabfa762392015-08-14 10:42:05 -0300126 upad->entity = media_entity_id(kpad->entity);
Laurent Pinchart16513332009-12-09 08:40:01 -0300127 upad->index = kpad->index;
128 upad->flags = kpad->flags;
129}
130
Sakari Ailusb0a1f2a2013-01-22 12:27:56 -0300131static long __media_device_enum_links(struct media_device *mdev,
132 struct media_links_enum *links)
Laurent Pinchart16513332009-12-09 08:40:01 -0300133{
134 struct media_entity *entity;
Laurent Pinchart16513332009-12-09 08:40:01 -0300135
Sakari Ailusb0a1f2a2013-01-22 12:27:56 -0300136 entity = find_entity(mdev, links->entity);
Laurent Pinchart16513332009-12-09 08:40:01 -0300137 if (entity == NULL)
138 return -EINVAL;
139
Sakari Ailusb0a1f2a2013-01-22 12:27:56 -0300140 if (links->pads) {
Laurent Pinchart16513332009-12-09 08:40:01 -0300141 unsigned int p;
142
143 for (p = 0; p < entity->num_pads; p++) {
144 struct media_pad_desc pad;
Dan Carpenterc88e7392013-04-13 06:32:15 -0300145
146 memset(&pad, 0, sizeof(pad));
Laurent Pinchart16513332009-12-09 08:40:01 -0300147 media_device_kpad_to_upad(&entity->pads[p], &pad);
Sakari Ailusb0a1f2a2013-01-22 12:27:56 -0300148 if (copy_to_user(&links->pads[p], &pad, sizeof(pad)))
Laurent Pinchart16513332009-12-09 08:40:01 -0300149 return -EFAULT;
150 }
151 }
152
Sakari Ailusb0a1f2a2013-01-22 12:27:56 -0300153 if (links->links) {
Mauro Carvalho Chehabb83e2502015-12-11 07:25:01 -0200154 struct media_link *link;
155 struct media_link_desc __user *ulink_desc = links->links;
Laurent Pinchart16513332009-12-09 08:40:01 -0300156
Mauro Carvalho Chehabb83e2502015-12-11 07:25:01 -0200157 list_for_each_entry(link, &entity->links, list) {
158 struct media_link_desc klink_desc;
Laurent Pinchart16513332009-12-09 08:40:01 -0300159
160 /* Ignore backlinks. */
Mauro Carvalho Chehabb83e2502015-12-11 07:25:01 -0200161 if (link->source->entity != entity)
Laurent Pinchart16513332009-12-09 08:40:01 -0300162 continue;
Mauro Carvalho Chehabb83e2502015-12-11 07:25:01 -0200163 memset(&klink_desc, 0, sizeof(klink_desc));
164 media_device_kpad_to_upad(link->source,
165 &klink_desc.source);
166 media_device_kpad_to_upad(link->sink,
167 &klink_desc.sink);
168 klink_desc.flags = link->flags;
169 if (copy_to_user(ulink_desc, &klink_desc,
170 sizeof(*ulink_desc)))
Laurent Pinchart16513332009-12-09 08:40:01 -0300171 return -EFAULT;
Mauro Carvalho Chehabb83e2502015-12-11 07:25:01 -0200172 ulink_desc++;
Laurent Pinchart16513332009-12-09 08:40:01 -0300173 }
174 }
Sakari Ailusb0a1f2a2013-01-22 12:27:56 -0300175
176 return 0;
177}
178
179static long media_device_enum_links(struct media_device *mdev,
180 struct media_links_enum __user *ulinks)
181{
182 struct media_links_enum links;
183 int rval;
184
185 if (copy_from_user(&links, ulinks, sizeof(links)))
186 return -EFAULT;
187
188 rval = __media_device_enum_links(mdev, &links);
189 if (rval < 0)
190 return rval;
191
Laurent Pinchart16513332009-12-09 08:40:01 -0300192 if (copy_to_user(ulinks, &links, sizeof(*ulinks)))
193 return -EFAULT;
Sakari Ailusb0a1f2a2013-01-22 12:27:56 -0300194
Laurent Pinchart16513332009-12-09 08:40:01 -0300195 return 0;
196}
197
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300198static long media_device_setup_link(struct media_device *mdev,
199 struct media_link_desc __user *_ulink)
200{
201 struct media_link *link = NULL;
202 struct media_link_desc ulink;
203 struct media_entity *source;
204 struct media_entity *sink;
205 int ret;
206
207 if (copy_from_user(&ulink, _ulink, sizeof(ulink)))
208 return -EFAULT;
209
210 /* Find the source and sink entities and link.
211 */
212 source = find_entity(mdev, ulink.source.entity);
213 sink = find_entity(mdev, ulink.sink.entity);
214
215 if (source == NULL || sink == NULL)
216 return -EINVAL;
217
218 if (ulink.source.index >= source->num_pads ||
219 ulink.sink.index >= sink->num_pads)
220 return -EINVAL;
221
222 link = media_entity_find_link(&source->pads[ulink.source.index],
223 &sink->pads[ulink.sink.index]);
224 if (link == NULL)
225 return -EINVAL;
226
227 /* Setup the link on both entities. */
228 ret = __media_entity_setup_link(link, ulink.flags);
229
230 if (copy_to_user(_ulink, &ulink, sizeof(ulink)))
231 return -EFAULT;
232
233 return ret;
234}
235
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300236static long __media_device_get_topology(struct media_device *mdev,
237 struct media_v2_topology *topo)
238{
239 struct media_entity *entity;
240 struct media_interface *intf;
241 struct media_pad *pad;
242 struct media_link *link;
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200243 struct media_v2_entity kentity, *uentity;
244 struct media_v2_interface kintf, *uintf;
245 struct media_v2_pad kpad, *upad;
246 struct media_v2_link klink, *ulink;
Mauro Carvalho Chehab9033b1a2015-09-09 08:23:51 -0300247 unsigned int i;
248 int ret = 0;
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300249
250 topo->topology_version = mdev->topology_version;
251
252 /* Get entities and number of entities */
253 i = 0;
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200254 uentity = media_get_uptr(topo->ptr_entities);
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300255 media_device_for_each_entity(entity, mdev) {
256 i++;
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200257 if (ret || !uentity)
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300258 continue;
259
260 if (i > topo->num_entities) {
261 ret = -ENOSPC;
262 continue;
263 }
264
265 /* Copy fields to userspace struct if not error */
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200266 memset(&kentity, 0, sizeof(kentity));
267 kentity.id = entity->graph_obj.id;
268 kentity.function = entity->function;
269 strncpy(kentity.name, entity->name,
270 sizeof(kentity.name));
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300271
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200272 if (copy_to_user(uentity, &kentity, sizeof(kentity)))
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300273 ret = -EFAULT;
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200274 uentity++;
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300275 }
276 topo->num_entities = i;
277
278 /* Get interfaces and number of interfaces */
279 i = 0;
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200280 uintf = media_get_uptr(topo->ptr_interfaces);
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300281 media_device_for_each_intf(intf, mdev) {
282 i++;
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200283 if (ret || !uintf)
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300284 continue;
285
286 if (i > topo->num_interfaces) {
287 ret = -ENOSPC;
288 continue;
289 }
290
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200291 memset(&kintf, 0, sizeof(kintf));
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300292
293 /* Copy intf fields to userspace struct */
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200294 kintf.id = intf->graph_obj.id;
295 kintf.intf_type = intf->type;
296 kintf.flags = intf->flags;
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300297
298 if (media_type(&intf->graph_obj) == MEDIA_GRAPH_INTF_DEVNODE) {
299 struct media_intf_devnode *devnode;
300
301 devnode = intf_to_devnode(intf);
302
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200303 kintf.devnode.major = devnode->major;
304 kintf.devnode.minor = devnode->minor;
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300305 }
306
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200307 if (copy_to_user(uintf, &kintf, sizeof(kintf)))
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300308 ret = -EFAULT;
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200309 uintf++;
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300310 }
311 topo->num_interfaces = i;
312
313 /* Get pads and number of pads */
314 i = 0;
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200315 upad = media_get_uptr(topo->ptr_pads);
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300316 media_device_for_each_pad(pad, mdev) {
317 i++;
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200318 if (ret || !upad)
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300319 continue;
320
321 if (i > topo->num_pads) {
322 ret = -ENOSPC;
323 continue;
324 }
325
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200326 memset(&kpad, 0, sizeof(kpad));
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300327
328 /* Copy pad fields to userspace struct */
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200329 kpad.id = pad->graph_obj.id;
330 kpad.entity_id = pad->entity->graph_obj.id;
331 kpad.flags = pad->flags;
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300332
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200333 if (copy_to_user(upad, &kpad, sizeof(kpad)))
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300334 ret = -EFAULT;
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200335 upad++;
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300336 }
337 topo->num_pads = i;
338
339 /* Get links and number of links */
340 i = 0;
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200341 ulink = media_get_uptr(topo->ptr_links);
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300342 media_device_for_each_link(link, mdev) {
Mauro Carvalho Chehab39d1ebc62015-08-30 09:53:57 -0300343 if (link->is_backlink)
344 continue;
345
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300346 i++;
347
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200348 if (ret || !ulink)
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300349 continue;
350
351 if (i > topo->num_links) {
352 ret = -ENOSPC;
353 continue;
354 }
355
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200356 memset(&klink, 0, sizeof(klink));
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300357
358 /* Copy link fields to userspace struct */
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200359 klink.id = link->graph_obj.id;
360 klink.source_id = link->gobj0->id;
361 klink.sink_id = link->gobj1->id;
362 klink.flags = link->flags;
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300363
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200364 if (copy_to_user(ulink, &klink, sizeof(klink)))
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300365 ret = -EFAULT;
Mauro Carvalho Chehabb3b7a9f2015-12-11 16:07:57 -0200366 ulink++;
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300367 }
368 topo->num_links = i;
369
370 return ret;
371}
372
373static long media_device_get_topology(struct media_device *mdev,
374 struct media_v2_topology __user *utopo)
375{
376 struct media_v2_topology ktopo;
377 int ret;
378
379 ret = copy_from_user(&ktopo, utopo, sizeof(ktopo));
380
381 if (ret < 0)
382 return ret;
383
384 ret = __media_device_get_topology(mdev, &ktopo);
385 if (ret < 0)
386 return ret;
387
388 ret = copy_to_user(utopo, &ktopo, sizeof(*utopo));
389
390 return ret;
391}
392
Laurent Pinchart140d8812010-08-18 11:41:22 -0300393static long media_device_ioctl(struct file *filp, unsigned int cmd,
394 unsigned long arg)
395{
396 struct media_devnode *devnode = media_devnode_data(filp);
397 struct media_device *dev = to_media_device(devnode);
398 long ret;
399
400 switch (cmd) {
401 case MEDIA_IOC_DEVICE_INFO:
402 ret = media_device_get_info(dev,
403 (struct media_device_info __user *)arg);
404 break;
405
Laurent Pinchart16513332009-12-09 08:40:01 -0300406 case MEDIA_IOC_ENUM_ENTITIES:
407 ret = media_device_enum_entities(dev,
408 (struct media_entity_desc __user *)arg);
409 break;
410
411 case MEDIA_IOC_ENUM_LINKS:
412 mutex_lock(&dev->graph_mutex);
413 ret = media_device_enum_links(dev,
414 (struct media_links_enum __user *)arg);
415 mutex_unlock(&dev->graph_mutex);
416 break;
417
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300418 case MEDIA_IOC_SETUP_LINK:
419 mutex_lock(&dev->graph_mutex);
420 ret = media_device_setup_link(dev,
421 (struct media_link_desc __user *)arg);
422 mutex_unlock(&dev->graph_mutex);
423 break;
424
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300425 case MEDIA_IOC_G_TOPOLOGY:
426 mutex_lock(&dev->graph_mutex);
427 ret = media_device_get_topology(dev,
428 (struct media_v2_topology __user *)arg);
429 mutex_unlock(&dev->graph_mutex);
430 break;
431
Laurent Pinchart140d8812010-08-18 11:41:22 -0300432 default:
433 ret = -ENOIOCTLCMD;
434 }
435
436 return ret;
437}
438
Sakari Ailusb0a1f2a2013-01-22 12:27:56 -0300439#ifdef CONFIG_COMPAT
440
441struct media_links_enum32 {
442 __u32 entity;
443 compat_uptr_t pads; /* struct media_pad_desc * */
444 compat_uptr_t links; /* struct media_link_desc * */
445 __u32 reserved[4];
446};
447
448static long media_device_enum_links32(struct media_device *mdev,
449 struct media_links_enum32 __user *ulinks)
450{
451 struct media_links_enum links;
452 compat_uptr_t pads_ptr, links_ptr;
453
454 memset(&links, 0, sizeof(links));
455
456 if (get_user(links.entity, &ulinks->entity)
457 || get_user(pads_ptr, &ulinks->pads)
458 || get_user(links_ptr, &ulinks->links))
459 return -EFAULT;
460
461 links.pads = compat_ptr(pads_ptr);
462 links.links = compat_ptr(links_ptr);
463
464 return __media_device_enum_links(mdev, &links);
465}
466
467#define MEDIA_IOC_ENUM_LINKS32 _IOWR('|', 0x02, struct media_links_enum32)
468
469static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
470 unsigned long arg)
471{
472 struct media_devnode *devnode = media_devnode_data(filp);
473 struct media_device *dev = to_media_device(devnode);
474 long ret;
475
476 switch (cmd) {
477 case MEDIA_IOC_DEVICE_INFO:
478 case MEDIA_IOC_ENUM_ENTITIES:
479 case MEDIA_IOC_SETUP_LINK:
Mauro Carvalho Chehab8309f472015-08-23 10:36:41 -0300480 case MEDIA_IOC_G_TOPOLOGY:
Sakari Ailusb0a1f2a2013-01-22 12:27:56 -0300481 return media_device_ioctl(filp, cmd, arg);
482
483 case MEDIA_IOC_ENUM_LINKS32:
484 mutex_lock(&dev->graph_mutex);
485 ret = media_device_enum_links32(dev,
486 (struct media_links_enum32 __user *)arg);
487 mutex_unlock(&dev->graph_mutex);
488 break;
489
490 default:
491 ret = -ENOIOCTLCMD;
492 }
493
494 return ret;
495}
496#endif /* CONFIG_COMPAT */
497
Laurent Pinchart176fb0d2009-12-09 08:39:58 -0300498static const struct media_file_operations media_device_fops = {
499 .owner = THIS_MODULE,
Laurent Pinchart140d8812010-08-18 11:41:22 -0300500 .open = media_device_open,
501 .ioctl = media_device_ioctl,
Sakari Ailusb0a1f2a2013-01-22 12:27:56 -0300502#ifdef CONFIG_COMPAT
503 .compat_ioctl = media_device_compat_ioctl,
504#endif /* CONFIG_COMPAT */
Laurent Pinchart140d8812010-08-18 11:41:22 -0300505 .release = media_device_close,
Laurent Pinchart176fb0d2009-12-09 08:39:58 -0300506};
507
508/* -----------------------------------------------------------------------------
509 * sysfs
510 */
511
512static ssize_t show_model(struct device *cd,
513 struct device_attribute *attr, char *buf)
514{
515 struct media_device *mdev = to_media_device(to_media_devnode(cd));
516
517 return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
518}
519
520static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
521
522/* -----------------------------------------------------------------------------
523 * Registration/unregistration
524 */
525
526static void media_device_release(struct media_devnode *mdev)
527{
Mauro Carvalho Chehab8f5a3182015-08-13 15:22:24 -0300528 dev_dbg(mdev->parent, "Media device released\n");
Laurent Pinchart176fb0d2009-12-09 08:39:58 -0300529}
530
531/**
Mauro Carvalho Chehabb2ed8af2015-12-15 08:26:52 -0200532 * media_device_register_entity - Register an entity with a media device
533 * @mdev: The media device
534 * @entity: The entity
535 */
536int __must_check media_device_register_entity(struct media_device *mdev,
537 struct media_entity *entity)
538{
539 unsigned int i;
540
541 if (entity->function == MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN ||
542 entity->function == MEDIA_ENT_F_UNKNOWN)
543 dev_warn(mdev->dev,
544 "Entity type for entity %s was not initialized!\n",
545 entity->name);
546
547 /* Warn if we apparently re-register an entity */
548 WARN_ON(entity->graph_obj.mdev != NULL);
549 entity->graph_obj.mdev = mdev;
550 INIT_LIST_HEAD(&entity->links);
551 entity->num_links = 0;
552 entity->num_backlinks = 0;
553
554 spin_lock(&mdev->lock);
555 /* Initialize media_gobj embedded at the entity */
556 media_gobj_create(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
557
558 /* Initialize objects at the pads */
559 for (i = 0; i < entity->num_pads; i++)
560 media_gobj_create(mdev, MEDIA_GRAPH_PAD,
561 &entity->pads[i].graph_obj);
562
563 spin_unlock(&mdev->lock);
564
565 return 0;
566}
567EXPORT_SYMBOL_GPL(media_device_register_entity);
568
569/**
570 * media_device_unregister_entity - Unregister an entity
571 * @entity: The entity
572 *
573 * If the entity has never been registered this function will return
574 * immediately.
575 */
Mauro Carvalho Chehab821ed362015-12-15 08:36:51 -0200576static void __media_device_unregister_entity(struct media_entity *entity)
Mauro Carvalho Chehabb2ed8af2015-12-15 08:26:52 -0200577{
578 struct media_device *mdev = entity->graph_obj.mdev;
579 struct media_link *link, *tmp;
580 struct media_interface *intf;
581 unsigned int i;
582
Mauro Carvalho Chehabb2ed8af2015-12-15 08:26:52 -0200583 /* Remove all interface links pointing to this entity */
584 list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) {
585 list_for_each_entry_safe(link, tmp, &intf->links, list) {
586 if (link->entity == entity)
587 __media_remove_intf_link(link);
588 }
589 }
590
591 /* Remove all data links that belong to this entity */
592 __media_entity_remove_links(entity);
593
594 /* Remove all pads that belong to this entity */
595 for (i = 0; i < entity->num_pads; i++)
596 media_gobj_destroy(&entity->pads[i].graph_obj);
597
598 /* Remove the entity */
599 media_gobj_destroy(&entity->graph_obj);
600
Mauro Carvalho Chehabb2ed8af2015-12-15 08:26:52 -0200601 entity->graph_obj.mdev = NULL;
602}
Mauro Carvalho Chehab821ed362015-12-15 08:36:51 -0200603
604void media_device_unregister_entity(struct media_entity *entity)
605{
606 struct media_device *mdev = entity->graph_obj.mdev;
607
608 if (mdev == NULL)
609 return;
610
611 spin_lock(&mdev->lock);
612 __media_device_unregister_entity(entity);
613 spin_unlock(&mdev->lock);
614}
Mauro Carvalho Chehabb2ed8af2015-12-15 08:26:52 -0200615EXPORT_SYMBOL_GPL(media_device_unregister_entity);
616
Mauro Carvalho Chehab821ed362015-12-15 08:36:51 -0200617
Mauro Carvalho Chehabb2ed8af2015-12-15 08:26:52 -0200618/**
Javier Martinez Canillas9832e152015-12-11 20:57:08 -0200619 * media_device_init() - initialize a media device
Laurent Pinchart176fb0d2009-12-09 08:39:58 -0300620 * @mdev: The media device
621 *
622 * The caller is responsible for initializing the media device before
623 * registration. The following fields must be set:
624 *
625 * - dev must point to the parent device
626 * - model must be filled with the device model name
627 */
Javier Martinez Canillas9832e152015-12-11 20:57:08 -0200628void media_device_init(struct media_device *mdev)
Laurent Pinchart176fb0d2009-12-09 08:39:58 -0300629{
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300630 INIT_LIST_HEAD(&mdev->entities);
Mauro Carvalho Chehab57cf79b2015-08-21 09:23:22 -0300631 INIT_LIST_HEAD(&mdev->interfaces);
Mauro Carvalho Chehab9155d852015-08-23 08:00:33 -0300632 INIT_LIST_HEAD(&mdev->pads);
633 INIT_LIST_HEAD(&mdev->links);
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300634 spin_lock_init(&mdev->lock);
Laurent Pinchart503c3d822010-03-07 15:04:59 -0300635 mutex_init(&mdev->graph_mutex);
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300636
Javier Martinez Canillas9832e152015-12-11 20:57:08 -0200637 dev_dbg(mdev->dev, "Media device initialized\n");
638}
639EXPORT_SYMBOL_GPL(media_device_init);
640
641/**
642 * media_device_cleanup() - Cleanup a media device
643 * @mdev: The media device
644 *
645 */
646void media_device_cleanup(struct media_device *mdev)
647{
648 mutex_destroy(&mdev->graph_mutex);
649}
650EXPORT_SYMBOL_GPL(media_device_cleanup);
651
652/**
653 * __media_device_register() - register a media device
654 * @mdev: The media device
655 * @owner: The module owner
656 *
657 * returns zero on success or a negative error code.
658 */
659int __must_check __media_device_register(struct media_device *mdev,
660 struct module *owner)
661{
662 int ret;
663
Laurent Pinchart176fb0d2009-12-09 08:39:58 -0300664 /* Register the device node. */
665 mdev->devnode.fops = &media_device_fops;
666 mdev->devnode.parent = mdev->dev;
667 mdev->devnode.release = media_device_release;
Javier Martinez Canillas8a950792015-12-11 20:57:09 -0200668
669 /* Set version 0 to indicate user-space that the graph is static */
670 mdev->topology_version = 0;
671
Sakari Ailus85de7212013-12-12 12:38:17 -0300672 ret = media_devnode_register(&mdev->devnode, owner);
Laurent Pinchart176fb0d2009-12-09 08:39:58 -0300673 if (ret < 0)
674 return ret;
675
676 ret = device_create_file(&mdev->devnode.dev, &dev_attr_model);
677 if (ret < 0) {
678 media_devnode_unregister(&mdev->devnode);
679 return ret;
680 }
681
Mauro Carvalho Chehab8f5a3182015-08-13 15:22:24 -0300682 dev_dbg(mdev->dev, "Media device registered\n");
683
Laurent Pinchart176fb0d2009-12-09 08:39:58 -0300684 return 0;
685}
Sakari Ailus85de7212013-12-12 12:38:17 -0300686EXPORT_SYMBOL_GPL(__media_device_register);
Laurent Pinchart176fb0d2009-12-09 08:39:58 -0300687
688/**
689 * media_device_unregister - unregister a media device
690 * @mdev: The media device
691 *
Javier Martinez Canillas223d19c2015-12-11 20:57:07 -0200692 * It is safe to call this function on an unregistered
693 * (but initialised) media device.
Laurent Pinchart176fb0d2009-12-09 08:39:58 -0300694 */
695void media_device_unregister(struct media_device *mdev)
696{
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300697 struct media_entity *entity;
698 struct media_entity *next;
Mauro Carvalho Chehabd47109f2015-08-29 21:23:44 -0300699 struct media_interface *intf, *tmp_intf;
700
Mauro Carvalho Chehab821ed362015-12-15 08:36:51 -0200701 if (mdev == NULL)
Javier Martinez Canillas223d19c2015-12-11 20:57:07 -0200702 return;
703
Mauro Carvalho Chehab821ed362015-12-15 08:36:51 -0200704 spin_lock(&mdev->lock);
705
706 /* Check if mdev was ever registered at all */
707 if (!media_devnode_is_registered(&mdev->devnode)) {
708 spin_unlock(&mdev->lock);
709 return;
710 }
711
Mauro Carvalho Chehabf50d5162015-09-04 15:10:29 -0300712 /* Remove all entities from the media device */
713 list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list)
Mauro Carvalho Chehab821ed362015-12-15 08:36:51 -0200714 __media_device_unregister_entity(entity);
Mauro Carvalho Chehabf50d5162015-09-04 15:10:29 -0300715
Mauro Carvalho Chehabd47109f2015-08-29 21:23:44 -0300716 /* Remove all interfaces from the media device */
Mauro Carvalho Chehabd47109f2015-08-29 21:23:44 -0300717 list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces,
718 graph_obj.list) {
719 __media_remove_intf_links(intf);
Mauro Carvalho Chehabc350ef82015-12-11 11:55:40 -0200720 media_gobj_destroy(&intf->graph_obj);
Mauro Carvalho Chehabd47109f2015-08-29 21:23:44 -0300721 kfree(intf);
722 }
Mauro Carvalho Chehab821ed362015-12-15 08:36:51 -0200723
Mauro Carvalho Chehabd47109f2015-08-29 21:23:44 -0300724 spin_unlock(&mdev->lock);
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300725
Laurent Pinchart176fb0d2009-12-09 08:39:58 -0300726 device_remove_file(&mdev->devnode.dev, &dev_attr_model);
727 media_devnode_unregister(&mdev->devnode);
Mauro Carvalho Chehab8f5a3182015-08-13 15:22:24 -0300728
729 dev_dbg(mdev->dev, "Media device unregistered\n");
Laurent Pinchart176fb0d2009-12-09 08:39:58 -0300730}
731EXPORT_SYMBOL_GPL(media_device_unregister);
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300732
Shuah Khand062f912015-06-03 12:12:53 -0300733static void media_device_release_devres(struct device *dev, void *res)
734{
735}
736
Shuah Khand062f912015-06-03 12:12:53 -0300737struct media_device *media_device_get_devres(struct device *dev)
738{
739 struct media_device *mdev;
740
741 mdev = devres_find(dev, media_device_release_devres, NULL, NULL);
742 if (mdev)
743 return mdev;
744
745 mdev = devres_alloc(media_device_release_devres,
746 sizeof(struct media_device), GFP_KERNEL);
747 if (!mdev)
748 return NULL;
749 return devres_get(dev, mdev, NULL, NULL);
750}
751EXPORT_SYMBOL_GPL(media_device_get_devres);
752
Shuah Khand062f912015-06-03 12:12:53 -0300753struct media_device *media_device_find_devres(struct device *dev)
754{
755 return devres_find(dev, media_device_release_devres, NULL, NULL);
756}
757EXPORT_SYMBOL_GPL(media_device_find_devres);
Shuah Khane576d602015-06-05 17:11:54 -0300758
759#endif /* CONFIG_MEDIA_CONTROLLER */