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1 | /* | |
2 | * Video capture interface for Linux version 2 | |
3 | * | |
4 | * A generic video device interface for the LINUX operating system | |
5 | * using a set of device structures/vectors for low level operations. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | * | |
12 | * Authors: Alan Cox, <alan@lxorguk.ukuu.org.uk> (version 1) | |
13 | * Mauro Carvalho Chehab <mchehab@infradead.org> (version 2) | |
14 | * | |
15 | * Fixes: 20000516 Claudio Matsuoka <claudio@conectiva.com> | |
16 | * - Added procfs support | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/types.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/kmod.h> | |
27 | #include <linux/slab.h> | |
28 | #include <asm/uaccess.h> | |
29 | ||
30 | #include <media/v4l2-common.h> | |
31 | #include <media/v4l2-device.h> | |
32 | #include <media/v4l2-ioctl.h> | |
33 | ||
34 | #define VIDEO_NUM_DEVICES 256 | |
35 | #define VIDEO_NAME "video4linux" | |
36 | ||
37 | /* | |
38 | * sysfs stuff | |
39 | */ | |
40 | ||
41 | static ssize_t show_index(struct device *cd, | |
42 | struct device_attribute *attr, char *buf) | |
43 | { | |
44 | struct video_device *vdev = to_video_device(cd); | |
45 | ||
46 | return sprintf(buf, "%i\n", vdev->index); | |
47 | } | |
48 | ||
49 | static ssize_t show_name(struct device *cd, | |
50 | struct device_attribute *attr, char *buf) | |
51 | { | |
52 | struct video_device *vdev = to_video_device(cd); | |
53 | ||
54 | return sprintf(buf, "%.*s\n", (int)sizeof(vdev->name), vdev->name); | |
55 | } | |
56 | ||
57 | static struct device_attribute video_device_attrs[] = { | |
58 | __ATTR(name, S_IRUGO, show_name, NULL), | |
59 | __ATTR(index, S_IRUGO, show_index, NULL), | |
60 | __ATTR_NULL | |
61 | }; | |
62 | ||
63 | /* | |
64 | * Active devices | |
65 | */ | |
66 | static struct video_device *video_device[VIDEO_NUM_DEVICES]; | |
67 | static DEFINE_MUTEX(videodev_lock); | |
68 | static DECLARE_BITMAP(devnode_nums[VFL_TYPE_MAX], VIDEO_NUM_DEVICES); | |
69 | ||
70 | /* Device node utility functions */ | |
71 | ||
72 | /* Note: these utility functions all assume that vfl_type is in the range | |
73 | [0, VFL_TYPE_MAX-1]. */ | |
74 | ||
75 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES | |
76 | /* Return the bitmap corresponding to vfl_type. */ | |
77 | static inline unsigned long *devnode_bits(int vfl_type) | |
78 | { | |
79 | /* Any types not assigned to fixed minor ranges must be mapped to | |
80 | one single bitmap for the purposes of finding a free node number | |
81 | since all those unassigned types use the same minor range. */ | |
82 | int idx = (vfl_type > VFL_TYPE_RADIO) ? VFL_TYPE_MAX - 1 : vfl_type; | |
83 | ||
84 | return devnode_nums[idx]; | |
85 | } | |
86 | #else | |
87 | /* Return the bitmap corresponding to vfl_type. */ | |
88 | static inline unsigned long *devnode_bits(int vfl_type) | |
89 | { | |
90 | return devnode_nums[vfl_type]; | |
91 | } | |
92 | #endif | |
93 | ||
94 | /* Mark device node number vdev->num as used */ | |
95 | static inline void devnode_set(struct video_device *vdev) | |
96 | { | |
97 | set_bit(vdev->num, devnode_bits(vdev->vfl_type)); | |
98 | } | |
99 | ||
100 | /* Mark device node number vdev->num as unused */ | |
101 | static inline void devnode_clear(struct video_device *vdev) | |
102 | { | |
103 | clear_bit(vdev->num, devnode_bits(vdev->vfl_type)); | |
104 | } | |
105 | ||
106 | /* Try to find a free device node number in the range [from, to> */ | |
107 | static inline int devnode_find(struct video_device *vdev, int from, int to) | |
108 | { | |
109 | return find_next_zero_bit(devnode_bits(vdev->vfl_type), to, from); | |
110 | } | |
111 | ||
112 | struct video_device *video_device_alloc(void) | |
113 | { | |
114 | return kzalloc(sizeof(struct video_device), GFP_KERNEL); | |
115 | } | |
116 | EXPORT_SYMBOL(video_device_alloc); | |
117 | ||
118 | void video_device_release(struct video_device *vdev) | |
119 | { | |
120 | kfree(vdev); | |
121 | } | |
122 | EXPORT_SYMBOL(video_device_release); | |
123 | ||
124 | void video_device_release_empty(struct video_device *vdev) | |
125 | { | |
126 | /* Do nothing */ | |
127 | /* Only valid when the video_device struct is a static. */ | |
128 | } | |
129 | EXPORT_SYMBOL(video_device_release_empty); | |
130 | ||
131 | static inline void video_get(struct video_device *vdev) | |
132 | { | |
133 | get_device(&vdev->dev); | |
134 | } | |
135 | ||
136 | static inline void video_put(struct video_device *vdev) | |
137 | { | |
138 | put_device(&vdev->dev); | |
139 | } | |
140 | ||
141 | /* Called when the last user of the video device exits. */ | |
142 | static void v4l2_device_release(struct device *cd) | |
143 | { | |
144 | struct video_device *vdev = to_video_device(cd); | |
145 | struct v4l2_device *v4l2_dev = vdev->v4l2_dev; | |
146 | ||
147 | mutex_lock(&videodev_lock); | |
148 | if (WARN_ON(video_device[vdev->minor] != vdev)) { | |
149 | /* should not happen */ | |
150 | mutex_unlock(&videodev_lock); | |
151 | return; | |
152 | } | |
153 | ||
154 | /* Free up this device for reuse */ | |
155 | video_device[vdev->minor] = NULL; | |
156 | ||
157 | /* Delete the cdev on this minor as well */ | |
158 | cdev_del(vdev->cdev); | |
159 | /* Just in case some driver tries to access this from | |
160 | the release() callback. */ | |
161 | vdev->cdev = NULL; | |
162 | ||
163 | /* Mark device node number as free */ | |
164 | devnode_clear(vdev); | |
165 | ||
166 | mutex_unlock(&videodev_lock); | |
167 | ||
168 | #if defined(CONFIG_MEDIA_CONTROLLER) | |
169 | if (v4l2_dev && v4l2_dev->mdev && | |
170 | vdev->vfl_type != VFL_TYPE_SUBDEV) | |
171 | media_device_unregister_entity(&vdev->entity); | |
172 | #endif | |
173 | ||
174 | /* Do not call v4l2_device_put if there is no release callback set. | |
175 | * Drivers that have no v4l2_device release callback might free the | |
176 | * v4l2_dev instance in the video_device release callback below, so we | |
177 | * must perform this check here. | |
178 | * | |
179 | * TODO: In the long run all drivers that use v4l2_device should use the | |
180 | * v4l2_device release callback. This check will then be unnecessary. | |
181 | */ | |
182 | if (v4l2_dev && v4l2_dev->release == NULL) | |
183 | v4l2_dev = NULL; | |
184 | ||
185 | /* Release video_device and perform other | |
186 | cleanups as needed. */ | |
187 | vdev->release(vdev); | |
188 | ||
189 | /* Decrease v4l2_device refcount */ | |
190 | if (v4l2_dev) | |
191 | v4l2_device_put(v4l2_dev); | |
192 | } | |
193 | ||
194 | static struct class video_class = { | |
195 | .name = VIDEO_NAME, | |
196 | .dev_attrs = video_device_attrs, | |
197 | }; | |
198 | ||
199 | struct video_device *video_devdata(struct file *file) | |
200 | { | |
201 | return video_device[iminor(file->f_path.dentry->d_inode)]; | |
202 | } | |
203 | EXPORT_SYMBOL(video_devdata); | |
204 | ||
205 | ||
206 | /* Priority handling */ | |
207 | ||
208 | static inline bool prio_is_valid(enum v4l2_priority prio) | |
209 | { | |
210 | return prio == V4L2_PRIORITY_BACKGROUND || | |
211 | prio == V4L2_PRIORITY_INTERACTIVE || | |
212 | prio == V4L2_PRIORITY_RECORD; | |
213 | } | |
214 | ||
215 | void v4l2_prio_init(struct v4l2_prio_state *global) | |
216 | { | |
217 | memset(global, 0, sizeof(*global)); | |
218 | } | |
219 | EXPORT_SYMBOL(v4l2_prio_init); | |
220 | ||
221 | int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local, | |
222 | enum v4l2_priority new) | |
223 | { | |
224 | if (!prio_is_valid(new)) | |
225 | return -EINVAL; | |
226 | if (*local == new) | |
227 | return 0; | |
228 | ||
229 | atomic_inc(&global->prios[new]); | |
230 | if (prio_is_valid(*local)) | |
231 | atomic_dec(&global->prios[*local]); | |
232 | *local = new; | |
233 | return 0; | |
234 | } | |
235 | EXPORT_SYMBOL(v4l2_prio_change); | |
236 | ||
237 | void v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local) | |
238 | { | |
239 | v4l2_prio_change(global, local, V4L2_PRIORITY_DEFAULT); | |
240 | } | |
241 | EXPORT_SYMBOL(v4l2_prio_open); | |
242 | ||
243 | void v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority local) | |
244 | { | |
245 | if (prio_is_valid(local)) | |
246 | atomic_dec(&global->prios[local]); | |
247 | } | |
248 | EXPORT_SYMBOL(v4l2_prio_close); | |
249 | ||
250 | enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global) | |
251 | { | |
252 | if (atomic_read(&global->prios[V4L2_PRIORITY_RECORD]) > 0) | |
253 | return V4L2_PRIORITY_RECORD; | |
254 | if (atomic_read(&global->prios[V4L2_PRIORITY_INTERACTIVE]) > 0) | |
255 | return V4L2_PRIORITY_INTERACTIVE; | |
256 | if (atomic_read(&global->prios[V4L2_PRIORITY_BACKGROUND]) > 0) | |
257 | return V4L2_PRIORITY_BACKGROUND; | |
258 | return V4L2_PRIORITY_UNSET; | |
259 | } | |
260 | EXPORT_SYMBOL(v4l2_prio_max); | |
261 | ||
262 | int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority local) | |
263 | { | |
264 | return (local < v4l2_prio_max(global)) ? -EBUSY : 0; | |
265 | } | |
266 | EXPORT_SYMBOL(v4l2_prio_check); | |
267 | ||
268 | ||
269 | static ssize_t v4l2_read(struct file *filp, char __user *buf, | |
270 | size_t sz, loff_t *off) | |
271 | { | |
272 | struct video_device *vdev = video_devdata(filp); | |
273 | int ret = -ENODEV; | |
274 | ||
275 | if (!vdev->fops->read) | |
276 | return -EINVAL; | |
277 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) && | |
278 | mutex_lock_interruptible(vdev->lock)) | |
279 | return -ERESTARTSYS; | |
280 | if (video_is_registered(vdev)) | |
281 | ret = vdev->fops->read(filp, buf, sz, off); | |
282 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) | |
283 | mutex_unlock(vdev->lock); | |
284 | return ret; | |
285 | } | |
286 | ||
287 | static ssize_t v4l2_write(struct file *filp, const char __user *buf, | |
288 | size_t sz, loff_t *off) | |
289 | { | |
290 | struct video_device *vdev = video_devdata(filp); | |
291 | int ret = -ENODEV; | |
292 | ||
293 | if (!vdev->fops->write) | |
294 | return -EINVAL; | |
295 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) && | |
296 | mutex_lock_interruptible(vdev->lock)) | |
297 | return -ERESTARTSYS; | |
298 | if (video_is_registered(vdev)) | |
299 | ret = vdev->fops->write(filp, buf, sz, off); | |
300 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) | |
301 | mutex_unlock(vdev->lock); | |
302 | return ret; | |
303 | } | |
304 | ||
305 | static unsigned int v4l2_poll(struct file *filp, struct poll_table_struct *poll) | |
306 | { | |
307 | struct video_device *vdev = video_devdata(filp); | |
308 | int ret = POLLERR | POLLHUP; | |
309 | ||
310 | if (!vdev->fops->poll) | |
311 | return DEFAULT_POLLMASK; | |
312 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) | |
313 | mutex_lock(vdev->lock); | |
314 | if (video_is_registered(vdev)) | |
315 | ret = vdev->fops->poll(filp, poll); | |
316 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) | |
317 | mutex_unlock(vdev->lock); | |
318 | return ret; | |
319 | } | |
320 | ||
321 | static long v4l2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
322 | { | |
323 | struct video_device *vdev = video_devdata(filp); | |
324 | int ret = -ENODEV; | |
325 | ||
326 | if (vdev->fops->unlocked_ioctl) { | |
327 | bool locked = false; | |
328 | ||
329 | if (vdev->lock) { | |
330 | /* always lock unless the cmd is marked as "don't use lock" */ | |
331 | locked = !v4l2_is_known_ioctl(cmd) || | |
332 | !test_bit(_IOC_NR(cmd), vdev->disable_locking); | |
333 | ||
334 | if (locked && mutex_lock_interruptible(vdev->lock)) | |
335 | return -ERESTARTSYS; | |
336 | } | |
337 | if (video_is_registered(vdev)) | |
338 | ret = vdev->fops->unlocked_ioctl(filp, cmd, arg); | |
339 | if (locked) | |
340 | mutex_unlock(vdev->lock); | |
341 | } else if (vdev->fops->ioctl) { | |
342 | /* This code path is a replacement for the BKL. It is a major | |
343 | * hack but it will have to do for those drivers that are not | |
344 | * yet converted to use unlocked_ioctl. | |
345 | * | |
346 | * There are two options: if the driver implements struct | |
347 | * v4l2_device, then the lock defined there is used to | |
348 | * serialize the ioctls. Otherwise the v4l2 core lock defined | |
349 | * below is used. This lock is really bad since it serializes | |
350 | * completely independent devices. | |
351 | * | |
352 | * Both variants suffer from the same problem: if the driver | |
353 | * sleeps, then it blocks all ioctls since the lock is still | |
354 | * held. This is very common for VIDIOC_DQBUF since that | |
355 | * normally waits for a frame to arrive. As a result any other | |
356 | * ioctl calls will proceed very, very slowly since each call | |
357 | * will have to wait for the VIDIOC_QBUF to finish. Things that | |
358 | * should take 0.01s may now take 10-20 seconds. | |
359 | * | |
360 | * The workaround is to *not* take the lock for VIDIOC_DQBUF. | |
361 | * This actually works OK for videobuf-based drivers, since | |
362 | * videobuf will take its own internal lock. | |
363 | */ | |
364 | static DEFINE_MUTEX(v4l2_ioctl_mutex); | |
365 | struct mutex *m = vdev->v4l2_dev ? | |
366 | &vdev->v4l2_dev->ioctl_lock : &v4l2_ioctl_mutex; | |
367 | ||
368 | if (cmd != VIDIOC_DQBUF && mutex_lock_interruptible(m)) | |
369 | return -ERESTARTSYS; | |
370 | if (video_is_registered(vdev)) | |
371 | ret = vdev->fops->ioctl(filp, cmd, arg); | |
372 | if (cmd != VIDIOC_DQBUF) | |
373 | mutex_unlock(m); | |
374 | } else | |
375 | ret = -ENOTTY; | |
376 | ||
377 | return ret; | |
378 | } | |
379 | ||
380 | #ifdef CONFIG_MMU | |
381 | #define v4l2_get_unmapped_area NULL | |
382 | #else | |
383 | static unsigned long v4l2_get_unmapped_area(struct file *filp, | |
384 | unsigned long addr, unsigned long len, unsigned long pgoff, | |
385 | unsigned long flags) | |
386 | { | |
387 | struct video_device *vdev = video_devdata(filp); | |
388 | ||
389 | if (!vdev->fops->get_unmapped_area) | |
390 | return -ENOSYS; | |
391 | if (!video_is_registered(vdev)) | |
392 | return -ENODEV; | |
393 | return vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags); | |
394 | } | |
395 | #endif | |
396 | ||
397 | static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm) | |
398 | { | |
399 | struct video_device *vdev = video_devdata(filp); | |
400 | int ret = -ENODEV; | |
401 | ||
402 | if (!vdev->fops->mmap) | |
403 | return ret; | |
404 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) && | |
405 | mutex_lock_interruptible(vdev->lock)) | |
406 | return -ERESTARTSYS; | |
407 | if (video_is_registered(vdev)) | |
408 | ret = vdev->fops->mmap(filp, vm); | |
409 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) | |
410 | mutex_unlock(vdev->lock); | |
411 | return ret; | |
412 | } | |
413 | ||
414 | /* Override for the open function */ | |
415 | static int v4l2_open(struct inode *inode, struct file *filp) | |
416 | { | |
417 | struct video_device *vdev; | |
418 | int ret = 0; | |
419 | ||
420 | /* Check if the video device is available */ | |
421 | mutex_lock(&videodev_lock); | |
422 | vdev = video_devdata(filp); | |
423 | /* return ENODEV if the video device has already been removed. */ | |
424 | if (vdev == NULL || !video_is_registered(vdev)) { | |
425 | mutex_unlock(&videodev_lock); | |
426 | return -ENODEV; | |
427 | } | |
428 | /* and increase the device refcount */ | |
429 | video_get(vdev); | |
430 | mutex_unlock(&videodev_lock); | |
431 | if (vdev->fops->open) { | |
432 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) && | |
433 | mutex_lock_interruptible(vdev->lock)) { | |
434 | ret = -ERESTARTSYS; | |
435 | goto err; | |
436 | } | |
437 | if (video_is_registered(vdev)) | |
438 | ret = vdev->fops->open(filp); | |
439 | else | |
440 | ret = -ENODEV; | |
441 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) | |
442 | mutex_unlock(vdev->lock); | |
443 | } | |
444 | ||
445 | err: | |
446 | /* decrease the refcount in case of an error */ | |
447 | if (ret) | |
448 | video_put(vdev); | |
449 | return ret; | |
450 | } | |
451 | ||
452 | /* Override for the release function */ | |
453 | static int v4l2_release(struct inode *inode, struct file *filp) | |
454 | { | |
455 | struct video_device *vdev = video_devdata(filp); | |
456 | int ret = 0; | |
457 | ||
458 | if (vdev->fops->release) { | |
459 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) | |
460 | mutex_lock(vdev->lock); | |
461 | vdev->fops->release(filp); | |
462 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) | |
463 | mutex_unlock(vdev->lock); | |
464 | } | |
465 | /* decrease the refcount unconditionally since the release() | |
466 | return value is ignored. */ | |
467 | video_put(vdev); | |
468 | return ret; | |
469 | } | |
470 | ||
471 | static const struct file_operations v4l2_fops = { | |
472 | .owner = THIS_MODULE, | |
473 | .read = v4l2_read, | |
474 | .write = v4l2_write, | |
475 | .open = v4l2_open, | |
476 | .get_unmapped_area = v4l2_get_unmapped_area, | |
477 | .mmap = v4l2_mmap, | |
478 | .unlocked_ioctl = v4l2_ioctl, | |
479 | #ifdef CONFIG_COMPAT | |
480 | .compat_ioctl = v4l2_compat_ioctl32, | |
481 | #endif | |
482 | .release = v4l2_release, | |
483 | .poll = v4l2_poll, | |
484 | .llseek = no_llseek, | |
485 | }; | |
486 | ||
487 | /** | |
488 | * get_index - assign stream index number based on parent device | |
489 | * @vdev: video_device to assign index number to, vdev->parent should be assigned | |
490 | * | |
491 | * Note that when this is called the new device has not yet been registered | |
492 | * in the video_device array, but it was able to obtain a minor number. | |
493 | * | |
494 | * This means that we can always obtain a free stream index number since | |
495 | * the worst case scenario is that there are VIDEO_NUM_DEVICES - 1 slots in | |
496 | * use of the video_device array. | |
497 | * | |
498 | * Returns a free index number. | |
499 | */ | |
500 | static int get_index(struct video_device *vdev) | |
501 | { | |
502 | /* This can be static since this function is called with the global | |
503 | videodev_lock held. */ | |
504 | static DECLARE_BITMAP(used, VIDEO_NUM_DEVICES); | |
505 | int i; | |
506 | ||
507 | /* Some drivers do not set the parent. In that case always return 0. */ | |
508 | if (vdev->parent == NULL) | |
509 | return 0; | |
510 | ||
511 | bitmap_zero(used, VIDEO_NUM_DEVICES); | |
512 | ||
513 | for (i = 0; i < VIDEO_NUM_DEVICES; i++) { | |
514 | if (video_device[i] != NULL && | |
515 | video_device[i]->parent == vdev->parent) { | |
516 | set_bit(video_device[i]->index, used); | |
517 | } | |
518 | } | |
519 | ||
520 | return find_first_zero_bit(used, VIDEO_NUM_DEVICES); | |
521 | } | |
522 | ||
523 | #define SET_VALID_IOCTL(ops, cmd, op) \ | |
524 | if (ops->op) \ | |
525 | set_bit(_IOC_NR(cmd), valid_ioctls) | |
526 | ||
527 | /* This determines which ioctls are actually implemented in the driver. | |
528 | It's a one-time thing which simplifies video_ioctl2 as it can just do | |
529 | a bit test. | |
530 | ||
531 | Note that drivers can override this by setting bits to 1 in | |
532 | vdev->valid_ioctls. If an ioctl is marked as 1 when this function is | |
533 | called, then that ioctl will actually be marked as unimplemented. | |
534 | ||
535 | It does that by first setting up the local valid_ioctls bitmap, and | |
536 | at the end do a: | |
537 | ||
538 | vdev->valid_ioctls = valid_ioctls & ~(vdev->valid_ioctls) | |
539 | */ | |
540 | static void determine_valid_ioctls(struct video_device *vdev) | |
541 | { | |
542 | DECLARE_BITMAP(valid_ioctls, BASE_VIDIOC_PRIVATE); | |
543 | const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops; | |
544 | ||
545 | bitmap_zero(valid_ioctls, BASE_VIDIOC_PRIVATE); | |
546 | ||
547 | SET_VALID_IOCTL(ops, VIDIOC_QUERYCAP, vidioc_querycap); | |
548 | if (ops->vidioc_g_priority || | |
549 | test_bit(V4L2_FL_USE_FH_PRIO, &vdev->flags)) | |
550 | set_bit(_IOC_NR(VIDIOC_G_PRIORITY), valid_ioctls); | |
551 | if (ops->vidioc_s_priority || | |
552 | test_bit(V4L2_FL_USE_FH_PRIO, &vdev->flags)) | |
553 | set_bit(_IOC_NR(VIDIOC_S_PRIORITY), valid_ioctls); | |
554 | if (ops->vidioc_enum_fmt_vid_cap || | |
555 | ops->vidioc_enum_fmt_vid_out || | |
556 | ops->vidioc_enum_fmt_vid_cap_mplane || | |
557 | ops->vidioc_enum_fmt_vid_out_mplane || | |
558 | ops->vidioc_enum_fmt_vid_overlay || | |
559 | ops->vidioc_enum_fmt_type_private) | |
560 | set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls); | |
561 | if (ops->vidioc_g_fmt_vid_cap || | |
562 | ops->vidioc_g_fmt_vid_out || | |
563 | ops->vidioc_g_fmt_vid_cap_mplane || | |
564 | ops->vidioc_g_fmt_vid_out_mplane || | |
565 | ops->vidioc_g_fmt_vid_overlay || | |
566 | ops->vidioc_g_fmt_vbi_cap || | |
567 | ops->vidioc_g_fmt_vid_out_overlay || | |
568 | ops->vidioc_g_fmt_vbi_out || | |
569 | ops->vidioc_g_fmt_sliced_vbi_cap || | |
570 | ops->vidioc_g_fmt_sliced_vbi_out || | |
571 | ops->vidioc_g_fmt_type_private) | |
572 | set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); | |
573 | if (ops->vidioc_s_fmt_vid_cap || | |
574 | ops->vidioc_s_fmt_vid_out || | |
575 | ops->vidioc_s_fmt_vid_cap_mplane || | |
576 | ops->vidioc_s_fmt_vid_out_mplane || | |
577 | ops->vidioc_s_fmt_vid_overlay || | |
578 | ops->vidioc_s_fmt_vbi_cap || | |
579 | ops->vidioc_s_fmt_vid_out_overlay || | |
580 | ops->vidioc_s_fmt_vbi_out || | |
581 | ops->vidioc_s_fmt_sliced_vbi_cap || | |
582 | ops->vidioc_s_fmt_sliced_vbi_out || | |
583 | ops->vidioc_s_fmt_type_private) | |
584 | set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); | |
585 | if (ops->vidioc_try_fmt_vid_cap || | |
586 | ops->vidioc_try_fmt_vid_out || | |
587 | ops->vidioc_try_fmt_vid_cap_mplane || | |
588 | ops->vidioc_try_fmt_vid_out_mplane || | |
589 | ops->vidioc_try_fmt_vid_overlay || | |
590 | ops->vidioc_try_fmt_vbi_cap || | |
591 | ops->vidioc_try_fmt_vid_out_overlay || | |
592 | ops->vidioc_try_fmt_vbi_out || | |
593 | ops->vidioc_try_fmt_sliced_vbi_cap || | |
594 | ops->vidioc_try_fmt_sliced_vbi_out || | |
595 | ops->vidioc_try_fmt_type_private) | |
596 | set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); | |
597 | SET_VALID_IOCTL(ops, VIDIOC_REQBUFS, vidioc_reqbufs); | |
598 | SET_VALID_IOCTL(ops, VIDIOC_QUERYBUF, vidioc_querybuf); | |
599 | SET_VALID_IOCTL(ops, VIDIOC_QBUF, vidioc_qbuf); | |
600 | SET_VALID_IOCTL(ops, VIDIOC_DQBUF, vidioc_dqbuf); | |
601 | SET_VALID_IOCTL(ops, VIDIOC_OVERLAY, vidioc_overlay); | |
602 | SET_VALID_IOCTL(ops, VIDIOC_G_FBUF, vidioc_g_fbuf); | |
603 | SET_VALID_IOCTL(ops, VIDIOC_S_FBUF, vidioc_s_fbuf); | |
604 | SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon); | |
605 | SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff); | |
606 | if (vdev->tvnorms) | |
607 | set_bit(_IOC_NR(VIDIOC_ENUMSTD), valid_ioctls); | |
608 | if (ops->vidioc_g_std || vdev->current_norm) | |
609 | set_bit(_IOC_NR(VIDIOC_G_STD), valid_ioctls); | |
610 | SET_VALID_IOCTL(ops, VIDIOC_S_STD, vidioc_s_std); | |
611 | SET_VALID_IOCTL(ops, VIDIOC_QUERYSTD, vidioc_querystd); | |
612 | SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input); | |
613 | SET_VALID_IOCTL(ops, VIDIOC_G_INPUT, vidioc_g_input); | |
614 | SET_VALID_IOCTL(ops, VIDIOC_S_INPUT, vidioc_s_input); | |
615 | SET_VALID_IOCTL(ops, VIDIOC_ENUMOUTPUT, vidioc_enum_output); | |
616 | SET_VALID_IOCTL(ops, VIDIOC_G_OUTPUT, vidioc_g_output); | |
617 | SET_VALID_IOCTL(ops, VIDIOC_S_OUTPUT, vidioc_s_output); | |
618 | /* Note: the control handler can also be passed through the filehandle, | |
619 | and that can't be tested here. If the bit for these control ioctls | |
620 | is set, then the ioctl is valid. But if it is 0, then it can still | |
621 | be valid if the filehandle passed the control handler. */ | |
622 | if (vdev->ctrl_handler || ops->vidioc_queryctrl) | |
623 | set_bit(_IOC_NR(VIDIOC_QUERYCTRL), valid_ioctls); | |
624 | if (vdev->ctrl_handler || ops->vidioc_g_ctrl || ops->vidioc_g_ext_ctrls) | |
625 | set_bit(_IOC_NR(VIDIOC_G_CTRL), valid_ioctls); | |
626 | if (vdev->ctrl_handler || ops->vidioc_s_ctrl || ops->vidioc_s_ext_ctrls) | |
627 | set_bit(_IOC_NR(VIDIOC_S_CTRL), valid_ioctls); | |
628 | if (vdev->ctrl_handler || ops->vidioc_g_ext_ctrls) | |
629 | set_bit(_IOC_NR(VIDIOC_G_EXT_CTRLS), valid_ioctls); | |
630 | if (vdev->ctrl_handler || ops->vidioc_s_ext_ctrls) | |
631 | set_bit(_IOC_NR(VIDIOC_S_EXT_CTRLS), valid_ioctls); | |
632 | if (vdev->ctrl_handler || ops->vidioc_try_ext_ctrls) | |
633 | set_bit(_IOC_NR(VIDIOC_TRY_EXT_CTRLS), valid_ioctls); | |
634 | if (vdev->ctrl_handler || ops->vidioc_querymenu) | |
635 | set_bit(_IOC_NR(VIDIOC_QUERYMENU), valid_ioctls); | |
636 | SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDIO, vidioc_enumaudio); | |
637 | SET_VALID_IOCTL(ops, VIDIOC_G_AUDIO, vidioc_g_audio); | |
638 | SET_VALID_IOCTL(ops, VIDIOC_S_AUDIO, vidioc_s_audio); | |
639 | SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDOUT, vidioc_enumaudout); | |
640 | SET_VALID_IOCTL(ops, VIDIOC_G_AUDOUT, vidioc_g_audout); | |
641 | SET_VALID_IOCTL(ops, VIDIOC_S_AUDOUT, vidioc_s_audout); | |
642 | SET_VALID_IOCTL(ops, VIDIOC_G_MODULATOR, vidioc_g_modulator); | |
643 | SET_VALID_IOCTL(ops, VIDIOC_S_MODULATOR, vidioc_s_modulator); | |
644 | if (ops->vidioc_g_crop || ops->vidioc_g_selection) | |
645 | set_bit(_IOC_NR(VIDIOC_G_CROP), valid_ioctls); | |
646 | if (ops->vidioc_s_crop || ops->vidioc_s_selection) | |
647 | set_bit(_IOC_NR(VIDIOC_S_CROP), valid_ioctls); | |
648 | SET_VALID_IOCTL(ops, VIDIOC_G_SELECTION, vidioc_g_selection); | |
649 | SET_VALID_IOCTL(ops, VIDIOC_S_SELECTION, vidioc_s_selection); | |
650 | if (ops->vidioc_cropcap || ops->vidioc_g_selection) | |
651 | set_bit(_IOC_NR(VIDIOC_CROPCAP), valid_ioctls); | |
652 | SET_VALID_IOCTL(ops, VIDIOC_G_JPEGCOMP, vidioc_g_jpegcomp); | |
653 | SET_VALID_IOCTL(ops, VIDIOC_S_JPEGCOMP, vidioc_s_jpegcomp); | |
654 | SET_VALID_IOCTL(ops, VIDIOC_G_ENC_INDEX, vidioc_g_enc_index); | |
655 | SET_VALID_IOCTL(ops, VIDIOC_ENCODER_CMD, vidioc_encoder_cmd); | |
656 | SET_VALID_IOCTL(ops, VIDIOC_TRY_ENCODER_CMD, vidioc_try_encoder_cmd); | |
657 | SET_VALID_IOCTL(ops, VIDIOC_DECODER_CMD, vidioc_decoder_cmd); | |
658 | SET_VALID_IOCTL(ops, VIDIOC_TRY_DECODER_CMD, vidioc_try_decoder_cmd); | |
659 | if (ops->vidioc_g_parm || vdev->current_norm) | |
660 | set_bit(_IOC_NR(VIDIOC_G_PARM), valid_ioctls); | |
661 | SET_VALID_IOCTL(ops, VIDIOC_S_PARM, vidioc_s_parm); | |
662 | SET_VALID_IOCTL(ops, VIDIOC_G_TUNER, vidioc_g_tuner); | |
663 | SET_VALID_IOCTL(ops, VIDIOC_S_TUNER, vidioc_s_tuner); | |
664 | SET_VALID_IOCTL(ops, VIDIOC_G_FREQUENCY, vidioc_g_frequency); | |
665 | SET_VALID_IOCTL(ops, VIDIOC_S_FREQUENCY, vidioc_s_frequency); | |
666 | SET_VALID_IOCTL(ops, VIDIOC_G_SLICED_VBI_CAP, vidioc_g_sliced_vbi_cap); | |
667 | SET_VALID_IOCTL(ops, VIDIOC_LOG_STATUS, vidioc_log_status); | |
668 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
669 | SET_VALID_IOCTL(ops, VIDIOC_DBG_G_REGISTER, vidioc_g_register); | |
670 | SET_VALID_IOCTL(ops, VIDIOC_DBG_S_REGISTER, vidioc_s_register); | |
671 | #endif | |
672 | SET_VALID_IOCTL(ops, VIDIOC_DBG_G_CHIP_IDENT, vidioc_g_chip_ident); | |
673 | SET_VALID_IOCTL(ops, VIDIOC_S_HW_FREQ_SEEK, vidioc_s_hw_freq_seek); | |
674 | SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes); | |
675 | SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals); | |
676 | SET_VALID_IOCTL(ops, VIDIOC_ENUM_DV_PRESETS, vidioc_enum_dv_presets); | |
677 | SET_VALID_IOCTL(ops, VIDIOC_S_DV_PRESET, vidioc_s_dv_preset); | |
678 | SET_VALID_IOCTL(ops, VIDIOC_G_DV_PRESET, vidioc_g_dv_preset); | |
679 | SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_PRESET, vidioc_query_dv_preset); | |
680 | SET_VALID_IOCTL(ops, VIDIOC_S_DV_TIMINGS, vidioc_s_dv_timings); | |
681 | SET_VALID_IOCTL(ops, VIDIOC_G_DV_TIMINGS, vidioc_g_dv_timings); | |
682 | /* yes, really vidioc_subscribe_event */ | |
683 | SET_VALID_IOCTL(ops, VIDIOC_DQEVENT, vidioc_subscribe_event); | |
684 | SET_VALID_IOCTL(ops, VIDIOC_SUBSCRIBE_EVENT, vidioc_subscribe_event); | |
685 | SET_VALID_IOCTL(ops, VIDIOC_UNSUBSCRIBE_EVENT, vidioc_unsubscribe_event); | |
686 | SET_VALID_IOCTL(ops, VIDIOC_CREATE_BUFS, vidioc_create_bufs); | |
687 | SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, vidioc_prepare_buf); | |
688 | bitmap_andnot(vdev->valid_ioctls, valid_ioctls, vdev->valid_ioctls, | |
689 | BASE_VIDIOC_PRIVATE); | |
690 | } | |
691 | ||
692 | /** | |
693 | * __video_register_device - register video4linux devices | |
694 | * @vdev: video device structure we want to register | |
695 | * @type: type of device to register | |
696 | * @nr: which device node number (0 == /dev/video0, 1 == /dev/video1, ... | |
697 | * -1 == first free) | |
698 | * @warn_if_nr_in_use: warn if the desired device node number | |
699 | * was already in use and another number was chosen instead. | |
700 | * @owner: module that owns the video device node | |
701 | * | |
702 | * The registration code assigns minor numbers and device node numbers | |
703 | * based on the requested type and registers the new device node with | |
704 | * the kernel. | |
705 | * | |
706 | * This function assumes that struct video_device was zeroed when it | |
707 | * was allocated and does not contain any stale date. | |
708 | * | |
709 | * An error is returned if no free minor or device node number could be | |
710 | * found, or if the registration of the device node failed. | |
711 | * | |
712 | * Zero is returned on success. | |
713 | * | |
714 | * Valid types are | |
715 | * | |
716 | * %VFL_TYPE_GRABBER - A frame grabber | |
717 | * | |
718 | * %VFL_TYPE_VBI - Vertical blank data (undecoded) | |
719 | * | |
720 | * %VFL_TYPE_RADIO - A radio card | |
721 | * | |
722 | * %VFL_TYPE_SUBDEV - A subdevice | |
723 | */ | |
724 | int __video_register_device(struct video_device *vdev, int type, int nr, | |
725 | int warn_if_nr_in_use, struct module *owner) | |
726 | { | |
727 | int i = 0; | |
728 | int ret; | |
729 | int minor_offset = 0; | |
730 | int minor_cnt = VIDEO_NUM_DEVICES; | |
731 | const char *name_base; | |
732 | ||
733 | /* A minor value of -1 marks this video device as never | |
734 | having been registered */ | |
735 | vdev->minor = -1; | |
736 | ||
737 | /* the release callback MUST be present */ | |
738 | if (WARN_ON(!vdev->release)) | |
739 | return -EINVAL; | |
740 | ||
741 | /* v4l2_fh support */ | |
742 | spin_lock_init(&vdev->fh_lock); | |
743 | INIT_LIST_HEAD(&vdev->fh_list); | |
744 | ||
745 | /* Part 1: check device type */ | |
746 | switch (type) { | |
747 | case VFL_TYPE_GRABBER: | |
748 | name_base = "video"; | |
749 | break; | |
750 | case VFL_TYPE_VBI: | |
751 | name_base = "vbi"; | |
752 | break; | |
753 | case VFL_TYPE_RADIO: | |
754 | name_base = "radio"; | |
755 | break; | |
756 | case VFL_TYPE_SUBDEV: | |
757 | name_base = "v4l-subdev"; | |
758 | break; | |
759 | default: | |
760 | printk(KERN_ERR "%s called with unknown type: %d\n", | |
761 | __func__, type); | |
762 | return -EINVAL; | |
763 | } | |
764 | ||
765 | vdev->vfl_type = type; | |
766 | vdev->cdev = NULL; | |
767 | if (vdev->v4l2_dev) { | |
768 | if (vdev->v4l2_dev->dev) | |
769 | vdev->parent = vdev->v4l2_dev->dev; | |
770 | if (vdev->ctrl_handler == NULL) | |
771 | vdev->ctrl_handler = vdev->v4l2_dev->ctrl_handler; | |
772 | /* If the prio state pointer is NULL, then use the v4l2_device | |
773 | prio state. */ | |
774 | if (vdev->prio == NULL) | |
775 | vdev->prio = &vdev->v4l2_dev->prio; | |
776 | } | |
777 | ||
778 | /* Part 2: find a free minor, device node number and device index. */ | |
779 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES | |
780 | /* Keep the ranges for the first four types for historical | |
781 | * reasons. | |
782 | * Newer devices (not yet in place) should use the range | |
783 | * of 128-191 and just pick the first free minor there | |
784 | * (new style). */ | |
785 | switch (type) { | |
786 | case VFL_TYPE_GRABBER: | |
787 | minor_offset = 0; | |
788 | minor_cnt = 64; | |
789 | break; | |
790 | case VFL_TYPE_RADIO: | |
791 | minor_offset = 64; | |
792 | minor_cnt = 64; | |
793 | break; | |
794 | case VFL_TYPE_VBI: | |
795 | minor_offset = 224; | |
796 | minor_cnt = 32; | |
797 | break; | |
798 | default: | |
799 | minor_offset = 128; | |
800 | minor_cnt = 64; | |
801 | break; | |
802 | } | |
803 | #endif | |
804 | ||
805 | /* Pick a device node number */ | |
806 | mutex_lock(&videodev_lock); | |
807 | nr = devnode_find(vdev, nr == -1 ? 0 : nr, minor_cnt); | |
808 | if (nr == minor_cnt) | |
809 | nr = devnode_find(vdev, 0, minor_cnt); | |
810 | if (nr == minor_cnt) { | |
811 | printk(KERN_ERR "could not get a free device node number\n"); | |
812 | mutex_unlock(&videodev_lock); | |
813 | return -ENFILE; | |
814 | } | |
815 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES | |
816 | /* 1-on-1 mapping of device node number to minor number */ | |
817 | i = nr; | |
818 | #else | |
819 | /* The device node number and minor numbers are independent, so | |
820 | we just find the first free minor number. */ | |
821 | for (i = 0; i < VIDEO_NUM_DEVICES; i++) | |
822 | if (video_device[i] == NULL) | |
823 | break; | |
824 | if (i == VIDEO_NUM_DEVICES) { | |
825 | mutex_unlock(&videodev_lock); | |
826 | printk(KERN_ERR "could not get a free minor\n"); | |
827 | return -ENFILE; | |
828 | } | |
829 | #endif | |
830 | vdev->minor = i + minor_offset; | |
831 | vdev->num = nr; | |
832 | devnode_set(vdev); | |
833 | ||
834 | /* Should not happen since we thought this minor was free */ | |
835 | WARN_ON(video_device[vdev->minor] != NULL); | |
836 | vdev->index = get_index(vdev); | |
837 | mutex_unlock(&videodev_lock); | |
838 | /* if no lock was passed, then make sure the LOCK_ALL_FOPS bit is | |
839 | clear and warn if it wasn't. */ | |
840 | if (vdev->lock == NULL) | |
841 | WARN_ON(test_and_clear_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)); | |
842 | ||
843 | if (vdev->ioctl_ops) | |
844 | determine_valid_ioctls(vdev); | |
845 | ||
846 | /* Part 3: Initialize the character device */ | |
847 | vdev->cdev = cdev_alloc(); | |
848 | if (vdev->cdev == NULL) { | |
849 | ret = -ENOMEM; | |
850 | goto cleanup; | |
851 | } | |
852 | vdev->cdev->ops = &v4l2_fops; | |
853 | vdev->cdev->owner = owner; | |
854 | ret = cdev_add(vdev->cdev, MKDEV(VIDEO_MAJOR, vdev->minor), 1); | |
855 | if (ret < 0) { | |
856 | printk(KERN_ERR "%s: cdev_add failed\n", __func__); | |
857 | kfree(vdev->cdev); | |
858 | vdev->cdev = NULL; | |
859 | goto cleanup; | |
860 | } | |
861 | ||
862 | /* Part 4: register the device with sysfs */ | |
863 | vdev->dev.class = &video_class; | |
864 | vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor); | |
865 | if (vdev->parent) | |
866 | vdev->dev.parent = vdev->parent; | |
867 | dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num); | |
868 | ret = device_register(&vdev->dev); | |
869 | if (ret < 0) { | |
870 | printk(KERN_ERR "%s: device_register failed\n", __func__); | |
871 | goto cleanup; | |
872 | } | |
873 | /* Register the release callback that will be called when the last | |
874 | reference to the device goes away. */ | |
875 | vdev->dev.release = v4l2_device_release; | |
876 | ||
877 | if (nr != -1 && nr != vdev->num && warn_if_nr_in_use) | |
878 | printk(KERN_WARNING "%s: requested %s%d, got %s\n", __func__, | |
879 | name_base, nr, video_device_node_name(vdev)); | |
880 | ||
881 | /* Increase v4l2_device refcount */ | |
882 | if (vdev->v4l2_dev) | |
883 | v4l2_device_get(vdev->v4l2_dev); | |
884 | ||
885 | #if defined(CONFIG_MEDIA_CONTROLLER) | |
886 | /* Part 5: Register the entity. */ | |
887 | if (vdev->v4l2_dev && vdev->v4l2_dev->mdev && | |
888 | vdev->vfl_type != VFL_TYPE_SUBDEV) { | |
889 | vdev->entity.type = MEDIA_ENT_T_DEVNODE_V4L; | |
890 | vdev->entity.name = vdev->name; | |
891 | vdev->entity.info.v4l.major = VIDEO_MAJOR; | |
892 | vdev->entity.info.v4l.minor = vdev->minor; | |
893 | ret = media_device_register_entity(vdev->v4l2_dev->mdev, | |
894 | &vdev->entity); | |
895 | if (ret < 0) | |
896 | printk(KERN_WARNING | |
897 | "%s: media_device_register_entity failed\n", | |
898 | __func__); | |
899 | } | |
900 | #endif | |
901 | /* Part 6: Activate this minor. The char device can now be used. */ | |
902 | set_bit(V4L2_FL_REGISTERED, &vdev->flags); | |
903 | mutex_lock(&videodev_lock); | |
904 | video_device[vdev->minor] = vdev; | |
905 | mutex_unlock(&videodev_lock); | |
906 | ||
907 | return 0; | |
908 | ||
909 | cleanup: | |
910 | mutex_lock(&videodev_lock); | |
911 | if (vdev->cdev) | |
912 | cdev_del(vdev->cdev); | |
913 | devnode_clear(vdev); | |
914 | mutex_unlock(&videodev_lock); | |
915 | /* Mark this video device as never having been registered. */ | |
916 | vdev->minor = -1; | |
917 | return ret; | |
918 | } | |
919 | EXPORT_SYMBOL(__video_register_device); | |
920 | ||
921 | /** | |
922 | * video_unregister_device - unregister a video4linux device | |
923 | * @vdev: the device to unregister | |
924 | * | |
925 | * This unregisters the passed device. Future open calls will | |
926 | * be met with errors. | |
927 | */ | |
928 | void video_unregister_device(struct video_device *vdev) | |
929 | { | |
930 | /* Check if vdev was ever registered at all */ | |
931 | if (!vdev || !video_is_registered(vdev)) | |
932 | return; | |
933 | ||
934 | mutex_lock(&videodev_lock); | |
935 | /* This must be in a critical section to prevent a race with v4l2_open. | |
936 | * Once this bit has been cleared video_get may never be called again. | |
937 | */ | |
938 | clear_bit(V4L2_FL_REGISTERED, &vdev->flags); | |
939 | mutex_unlock(&videodev_lock); | |
940 | device_unregister(&vdev->dev); | |
941 | } | |
942 | EXPORT_SYMBOL(video_unregister_device); | |
943 | ||
944 | /* | |
945 | * Initialise video for linux | |
946 | */ | |
947 | static int __init videodev_init(void) | |
948 | { | |
949 | dev_t dev = MKDEV(VIDEO_MAJOR, 0); | |
950 | int ret; | |
951 | ||
952 | printk(KERN_INFO "Linux video capture interface: v2.00\n"); | |
953 | ret = register_chrdev_region(dev, VIDEO_NUM_DEVICES, VIDEO_NAME); | |
954 | if (ret < 0) { | |
955 | printk(KERN_WARNING "videodev: unable to get major %d\n", | |
956 | VIDEO_MAJOR); | |
957 | return ret; | |
958 | } | |
959 | ||
960 | ret = class_register(&video_class); | |
961 | if (ret < 0) { | |
962 | unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); | |
963 | printk(KERN_WARNING "video_dev: class_register failed\n"); | |
964 | return -EIO; | |
965 | } | |
966 | ||
967 | return 0; | |
968 | } | |
969 | ||
970 | static void __exit videodev_exit(void) | |
971 | { | |
972 | dev_t dev = MKDEV(VIDEO_MAJOR, 0); | |
973 | ||
974 | class_unregister(&video_class); | |
975 | unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); | |
976 | } | |
977 | ||
978 | subsys_initcall(videodev_init); | |
979 | module_exit(videodev_exit) | |
980 | ||
981 | MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@infradead.org>"); | |
982 | MODULE_DESCRIPTION("Device registrar for Video4Linux drivers v2"); | |
983 | MODULE_LICENSE("GPL"); | |
984 | MODULE_ALIAS_CHARDEV_MAJOR(VIDEO_MAJOR); | |
985 | ||
986 | ||
987 | /* | |
988 | * Local variables: | |
989 | * c-basic-offset: 8 | |
990 | * End: | |
991 | */ |