Root/drivers/media/media-device.c

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#include <linux/types.h>
24#include <linux/ioctl.h>
25#include <linux/media.h>
26#include <linux/export.h>
27
28#include <media/media-device.h>
29#include <media/media-devnode.h>
30#include <media/media-entity.h>
31
32/* -----------------------------------------------------------------------------
33 * Userspace API
34 */
35
36static int media_device_open(struct file *filp)
37{
38    return 0;
39}
40
41static int media_device_close(struct file *filp)
42{
43    return 0;
44}
45
46static int media_device_get_info(struct media_device *dev,
47                 struct media_device_info __user *__info)
48{
49    struct media_device_info info;
50
51    memset(&info, 0, sizeof(info));
52
53    strlcpy(info.driver, dev->dev->driver->name, sizeof(info.driver));
54    strlcpy(info.model, dev->model, sizeof(info.model));
55    strlcpy(info.serial, dev->serial, sizeof(info.serial));
56    strlcpy(info.bus_info, dev->bus_info, sizeof(info.bus_info));
57
58    info.media_version = MEDIA_API_VERSION;
59    info.hw_revision = dev->hw_revision;
60    info.driver_version = dev->driver_version;
61
62    return copy_to_user(__info, &info, sizeof(*__info));
63}
64
65static struct media_entity *find_entity(struct media_device *mdev, u32 id)
66{
67    struct media_entity *entity;
68    int next = id & MEDIA_ENT_ID_FLAG_NEXT;
69
70    id &= ~MEDIA_ENT_ID_FLAG_NEXT;
71
72    spin_lock(&mdev->lock);
73
74    media_device_for_each_entity(entity, mdev) {
75        if ((entity->id == id && !next) ||
76            (entity->id > id && next)) {
77            spin_unlock(&mdev->lock);
78            return entity;
79        }
80    }
81
82    spin_unlock(&mdev->lock);
83
84    return NULL;
85}
86
87static long media_device_enum_entities(struct media_device *mdev,
88                       struct media_entity_desc __user *uent)
89{
90    struct media_entity *ent;
91    struct media_entity_desc u_ent;
92
93    if (copy_from_user(&u_ent.id, &uent->id, sizeof(u_ent.id)))
94        return -EFAULT;
95
96    ent = find_entity(mdev, u_ent.id);
97
98    if (ent == NULL)
99        return -EINVAL;
100
101    u_ent.id = ent->id;
102    u_ent.name[0] = '\0';
103    if (ent->name)
104        strlcpy(u_ent.name, ent->name, sizeof(u_ent.name));
105    u_ent.type = ent->type;
106    u_ent.revision = ent->revision;
107    u_ent.flags = ent->flags;
108    u_ent.group_id = ent->group_id;
109    u_ent.pads = ent->num_pads;
110    u_ent.links = ent->num_links - ent->num_backlinks;
111    memcpy(&u_ent.raw, &ent->info, sizeof(ent->info));
112    if (copy_to_user(uent, &u_ent, sizeof(u_ent)))
113        return -EFAULT;
114    return 0;
115}
116
117static void media_device_kpad_to_upad(const struct media_pad *kpad,
118                      struct media_pad_desc *upad)
119{
120    upad->entity = kpad->entity->id;
121    upad->index = kpad->index;
122    upad->flags = kpad->flags;
123}
124
125static long media_device_enum_links(struct media_device *mdev,
126                    struct media_links_enum __user *ulinks)
127{
128    struct media_entity *entity;
129    struct media_links_enum links;
130
131    if (copy_from_user(&links, ulinks, sizeof(links)))
132        return -EFAULT;
133
134    entity = find_entity(mdev, links.entity);
135    if (entity == NULL)
136        return -EINVAL;
137
138    if (links.pads) {
139        unsigned int p;
140
141        for (p = 0; p < entity->num_pads; p++) {
142            struct media_pad_desc pad;
143            media_device_kpad_to_upad(&entity->pads[p], &pad);
144            if (copy_to_user(&links.pads[p], &pad, sizeof(pad)))
145                return -EFAULT;
146        }
147    }
148
149    if (links.links) {
150        struct media_link_desc __user *ulink;
151        unsigned int l;
152
153        for (l = 0, ulink = links.links; l < entity->num_links; l++) {
154            struct media_link_desc link;
155
156            /* Ignore backlinks. */
157            if (entity->links[l].source->entity != entity)
158                continue;
159
160            media_device_kpad_to_upad(entity->links[l].source,
161                          &link.source);
162            media_device_kpad_to_upad(entity->links[l].sink,
163                          &link.sink);
164            link.flags = entity->links[l].flags;
165            if (copy_to_user(ulink, &link, sizeof(*ulink)))
166                return -EFAULT;
167            ulink++;
168        }
169    }
170    if (copy_to_user(ulinks, &links, sizeof(*ulinks)))
171        return -EFAULT;
172    return 0;
173}
174
175static long media_device_setup_link(struct media_device *mdev,
176                    struct media_link_desc __user *_ulink)
177{
178    struct media_link *link = NULL;
179    struct media_link_desc ulink;
180    struct media_entity *source;
181    struct media_entity *sink;
182    int ret;
183
184    if (copy_from_user(&ulink, _ulink, sizeof(ulink)))
185        return -EFAULT;
186
187    /* Find the source and sink entities and link.
188     */
189    source = find_entity(mdev, ulink.source.entity);
190    sink = find_entity(mdev, ulink.sink.entity);
191
192    if (source == NULL || sink == NULL)
193        return -EINVAL;
194
195    if (ulink.source.index >= source->num_pads ||
196        ulink.sink.index >= sink->num_pads)
197        return -EINVAL;
198
199    link = media_entity_find_link(&source->pads[ulink.source.index],
200                      &sink->pads[ulink.sink.index]);
201    if (link == NULL)
202        return -EINVAL;
203
204    /* Setup the link on both entities. */
205    ret = __media_entity_setup_link(link, ulink.flags);
206
207    if (copy_to_user(_ulink, &ulink, sizeof(ulink)))
208        return -EFAULT;
209
210    return ret;
211}
212
213static long media_device_ioctl(struct file *filp, unsigned int cmd,
214                   unsigned long arg)
215{
216    struct media_devnode *devnode = media_devnode_data(filp);
217    struct media_device *dev = to_media_device(devnode);
218    long ret;
219
220    switch (cmd) {
221    case MEDIA_IOC_DEVICE_INFO:
222        ret = media_device_get_info(dev,
223                (struct media_device_info __user *)arg);
224        break;
225
226    case MEDIA_IOC_ENUM_ENTITIES:
227        ret = media_device_enum_entities(dev,
228                (struct media_entity_desc __user *)arg);
229        break;
230
231    case MEDIA_IOC_ENUM_LINKS:
232        mutex_lock(&dev->graph_mutex);
233        ret = media_device_enum_links(dev,
234                (struct media_links_enum __user *)arg);
235        mutex_unlock(&dev->graph_mutex);
236        break;
237
238    case MEDIA_IOC_SETUP_LINK:
239        mutex_lock(&dev->graph_mutex);
240        ret = media_device_setup_link(dev,
241                (struct media_link_desc __user *)arg);
242        mutex_unlock(&dev->graph_mutex);
243        break;
244
245    default:
246        ret = -ENOIOCTLCMD;
247    }
248
249    return ret;
250}
251
252static const struct media_file_operations media_device_fops = {
253    .owner = THIS_MODULE,
254    .open = media_device_open,
255    .ioctl = media_device_ioctl,
256    .release = media_device_close,
257};
258
259/* -----------------------------------------------------------------------------
260 * sysfs
261 */
262
263static ssize_t show_model(struct device *cd,
264              struct device_attribute *attr, char *buf)
265{
266    struct media_device *mdev = to_media_device(to_media_devnode(cd));
267
268    return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
269}
270
271static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
272
273/* -----------------------------------------------------------------------------
274 * Registration/unregistration
275 */
276
277static void media_device_release(struct media_devnode *mdev)
278{
279}
280
281/**
282 * media_device_register - register a media device
283 * @mdev: The media device
284 *
285 * The caller is responsible for initializing the media device before
286 * registration. The following fields must be set:
287 *
288 * - dev must point to the parent device
289 * - model must be filled with the device model name
290 */
291int __must_check media_device_register(struct media_device *mdev)
292{
293    int ret;
294
295    if (WARN_ON(mdev->dev == NULL || mdev->model[0] == 0))
296        return -EINVAL;
297
298    mdev->entity_id = 1;
299    INIT_LIST_HEAD(&mdev->entities);
300    spin_lock_init(&mdev->lock);
301    mutex_init(&mdev->graph_mutex);
302
303    /* Register the device node. */
304    mdev->devnode.fops = &media_device_fops;
305    mdev->devnode.parent = mdev->dev;
306    mdev->devnode.release = media_device_release;
307    ret = media_devnode_register(&mdev->devnode);
308    if (ret < 0)
309        return ret;
310
311    ret = device_create_file(&mdev->devnode.dev, &dev_attr_model);
312    if (ret < 0) {
313        media_devnode_unregister(&mdev->devnode);
314        return ret;
315    }
316
317    return 0;
318}
319EXPORT_SYMBOL_GPL(media_device_register);
320
321/**
322 * media_device_unregister - unregister a media device
323 * @mdev: The media device
324 *
325 */
326void media_device_unregister(struct media_device *mdev)
327{
328    struct media_entity *entity;
329    struct media_entity *next;
330
331    list_for_each_entry_safe(entity, next, &mdev->entities, list)
332        media_device_unregister_entity(entity);
333
334    device_remove_file(&mdev->devnode.dev, &dev_attr_model);
335    media_devnode_unregister(&mdev->devnode);
336}
337EXPORT_SYMBOL_GPL(media_device_unregister);
338
339/**
340 * media_device_register_entity - Register an entity with a media device
341 * @mdev: The media device
342 * @entity: The entity
343 */
344int __must_check media_device_register_entity(struct media_device *mdev,
345                          struct media_entity *entity)
346{
347    /* Warn if we apparently re-register an entity */
348    WARN_ON(entity->parent != NULL);
349    entity->parent = mdev;
350
351    spin_lock(&mdev->lock);
352    if (entity->id == 0)
353        entity->id = mdev->entity_id++;
354    else
355        mdev->entity_id = max(entity->id + 1, mdev->entity_id);
356    list_add_tail(&entity->list, &mdev->entities);
357    spin_unlock(&mdev->lock);
358
359    return 0;
360}
361EXPORT_SYMBOL_GPL(media_device_register_entity);
362
363/**
364 * media_device_unregister_entity - Unregister an entity
365 * @entity: The entity
366 *
367 * If the entity has never been registered this function will return
368 * immediately.
369 */
370void media_device_unregister_entity(struct media_entity *entity)
371{
372    struct media_device *mdev = entity->parent;
373
374    if (mdev == NULL)
375        return;
376
377    spin_lock(&mdev->lock);
378    list_del(&entity->list);
379    spin_unlock(&mdev->lock);
380    entity->parent = NULL;
381}
382EXPORT_SYMBOL_GPL(media_device_unregister_entity);
383

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