Commit | Line | Data |
---|---|---|
27a5e6d3 HV |
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 | * | |
d9b01449 | 12 | * Authors: Alan Cox, <alan@lxorguk.ukuu.org.uk> (version 1) |
27a5e6d3 HV |
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> | |
27a5e6d3 | 28 | #include <asm/uaccess.h> |
27a5e6d3 HV |
29 | |
30 | #include <media/v4l2-common.h> | |
9bea3514 | 31 | #include <media/v4l2-device.h> |
bec43661 | 32 | #include <media/v4l2-ioctl.h> |
27a5e6d3 HV |
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 | { | |
dc93a70c | 44 | struct video_device *vdev = to_video_device(cd); |
bfa8a273 | 45 | |
dc93a70c | 46 | return sprintf(buf, "%i\n", vdev->index); |
27a5e6d3 HV |
47 | } |
48 | ||
49 | static ssize_t show_name(struct device *cd, | |
50 | struct device_attribute *attr, char *buf) | |
51 | { | |
dc93a70c | 52 | struct video_device *vdev = to_video_device(cd); |
bfa8a273 | 53 | |
dc93a70c | 54 | return sprintf(buf, "%.*s\n", (int)sizeof(vdev->name), vdev->name); |
27a5e6d3 HV |
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 | ||
7f8ecfab HV |
63 | /* |
64 | * Active devices | |
65 | */ | |
66 | static struct video_device *video_device[VIDEO_NUM_DEVICES]; | |
67 | static DEFINE_MUTEX(videodev_lock); | |
22e22125 | 68 | static DECLARE_BITMAP(devnode_nums[VFL_TYPE_MAX], VIDEO_NUM_DEVICES); |
7f8ecfab | 69 | |
5062cb70 HV |
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. */ | |
226c0eea | 82 | int idx = (vfl_type > VFL_TYPE_RADIO) ? VFL_TYPE_MAX - 1 : vfl_type; |
5062cb70 HV |
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 | ||
27a5e6d3 HV |
112 | struct video_device *video_device_alloc(void) |
113 | { | |
bfa8a273 | 114 | return kzalloc(sizeof(struct video_device), GFP_KERNEL); |
27a5e6d3 HV |
115 | } |
116 | EXPORT_SYMBOL(video_device_alloc); | |
117 | ||
dc93a70c | 118 | void video_device_release(struct video_device *vdev) |
27a5e6d3 | 119 | { |
dc93a70c | 120 | kfree(vdev); |
27a5e6d3 HV |
121 | } |
122 | EXPORT_SYMBOL(video_device_release); | |
123 | ||
dc93a70c | 124 | void video_device_release_empty(struct video_device *vdev) |
f9e86b5e HV |
125 | { |
126 | /* Do nothing */ | |
127 | /* Only valid when the video_device struct is a static. */ | |
128 | } | |
129 | EXPORT_SYMBOL(video_device_release_empty); | |
130 | ||
dc93a70c | 131 | static inline void video_get(struct video_device *vdev) |
7f8ecfab | 132 | { |
dc93a70c HV |
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); | |
bedf8bcf | 145 | struct v4l2_device *v4l2_dev = vdev->v4l2_dev; |
7f8ecfab HV |
146 | |
147 | mutex_lock(&videodev_lock); | |
1fc2b5f7 | 148 | if (WARN_ON(video_device[vdev->minor] != vdev)) { |
dc93a70c | 149 | /* should not happen */ |
1fc2b5f7 | 150 | mutex_unlock(&videodev_lock); |
6ea9a182 HV |
151 | return; |
152 | } | |
7f8ecfab HV |
153 | |
154 | /* Free up this device for reuse */ | |
dc93a70c | 155 | video_device[vdev->minor] = NULL; |
7f8ecfab | 156 | |
dc93a70c HV |
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; | |
7f8ecfab | 162 | |
22e22125 | 163 | /* Mark device node number as free */ |
5062cb70 | 164 | devnode_clear(vdev); |
7f8ecfab | 165 | |
dc93a70c | 166 | mutex_unlock(&videodev_lock); |
27a5e6d3 | 167 | |
c064b8ea | 168 | #if defined(CONFIG_MEDIA_CONTROLLER) |
1fc2b5f7 | 169 | if (v4l2_dev && v4l2_dev->mdev && |
c064b8ea LP |
170 | vdev->vfl_type != VFL_TYPE_SUBDEV) |
171 | media_device_unregister_entity(&vdev->entity); | |
172 | #endif | |
173 | ||
8280b662 HV |
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 | */ | |
e58fced2 | 182 | if (v4l2_dev && v4l2_dev->release == NULL) |
8280b662 HV |
183 | v4l2_dev = NULL; |
184 | ||
dc93a70c HV |
185 | /* Release video_device and perform other |
186 | cleanups as needed. */ | |
187 | vdev->release(vdev); | |
bedf8bcf HV |
188 | |
189 | /* Decrease v4l2_device refcount */ | |
190 | if (v4l2_dev) | |
191 | v4l2_device_put(v4l2_dev); | |
27a5e6d3 HV |
192 | } |
193 | ||
194 | static struct class video_class = { | |
195 | .name = VIDEO_NAME, | |
196 | .dev_attrs = video_device_attrs, | |
27a5e6d3 HV |
197 | }; |
198 | ||
27a5e6d3 HV |
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 | ||
02265493 HV |
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 | ||
dc93a70c HV |
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); | |
2877842d | 273 | int ret = -ENODEV; |
dc93a70c HV |
274 | |
275 | if (!vdev->fops->read) | |
276 | return -EINVAL; | |
5126f259 HV |
277 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) && |
278 | mutex_lock_interruptible(vdev->lock)) | |
2877842d | 279 | return -ERESTARTSYS; |
ee6869af HV |
280 | if (video_is_registered(vdev)) |
281 | ret = vdev->fops->read(filp, buf, sz, off); | |
5126f259 | 282 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) |
ee6869af HV |
283 | mutex_unlock(vdev->lock); |
284 | return ret; | |
dc93a70c HV |
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); | |
2877842d | 291 | int ret = -ENODEV; |
dc93a70c HV |
292 | |
293 | if (!vdev->fops->write) | |
294 | return -EINVAL; | |
5126f259 HV |
295 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) && |
296 | mutex_lock_interruptible(vdev->lock)) | |
2877842d | 297 | return -ERESTARTSYS; |
ee6869af HV |
298 | if (video_is_registered(vdev)) |
299 | ret = vdev->fops->write(filp, buf, sz, off); | |
5126f259 | 300 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) |
ee6869af HV |
301 | mutex_unlock(vdev->lock); |
302 | return ret; | |
dc93a70c HV |
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); | |
2877842d | 308 | int ret = POLLERR | POLLHUP; |
ee6869af HV |
309 | |
310 | if (!vdev->fops->poll) | |
2877842d | 311 | return DEFAULT_POLLMASK; |
5126f259 | 312 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) |
ee6869af HV |
313 | mutex_lock(vdev->lock); |
314 | if (video_is_registered(vdev)) | |
315 | ret = vdev->fops->poll(filp, poll); | |
5126f259 | 316 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) |
ee6869af HV |
317 | mutex_unlock(vdev->lock); |
318 | return ret; | |
dc93a70c HV |
319 | } |
320 | ||
86a5ef7d | 321 | static long v4l2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
dc93a70c HV |
322 | { |
323 | struct video_device *vdev = video_devdata(filp); | |
72420630 | 324 | int ret = -ENODEV; |
dc93a70c | 325 | |
86a5ef7d | 326 | if (vdev->fops->unlocked_ioctl) { |
8ab75e3e HV |
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) || | |
152a3a73 | 332 | !test_bit(_IOC_NR(cmd), vdev->disable_locking); |
8ab75e3e HV |
333 | |
334 | if (locked && mutex_lock_interruptible(vdev->lock)) | |
335 | return -ERESTARTSYS; | |
336 | } | |
72420630 MCC |
337 | if (video_is_registered(vdev)) |
338 | ret = vdev->fops->unlocked_ioctl(filp, cmd, arg); | |
8ab75e3e | 339 | if (locked) |
ee6869af | 340 | mutex_unlock(vdev->lock); |
86a5ef7d | 341 | } else if (vdev->fops->ioctl) { |
879aa24d HV |
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 | */ | |
0edf2e5e | 364 | static DEFINE_MUTEX(v4l2_ioctl_mutex); |
879aa24d HV |
365 | struct mutex *m = vdev->v4l2_dev ? |
366 | &vdev->v4l2_dev->ioctl_lock : &v4l2_ioctl_mutex; | |
0edf2e5e | 367 | |
879aa24d HV |
368 | if (cmd != VIDIOC_DQBUF && mutex_lock_interruptible(m)) |
369 | return -ERESTARTSYS; | |
72420630 MCC |
370 | if (video_is_registered(vdev)) |
371 | ret = vdev->fops->ioctl(filp, cmd, arg); | |
879aa24d HV |
372 | if (cmd != VIDIOC_DQBUF) |
373 | mutex_unlock(m); | |
86a5ef7d AB |
374 | } else |
375 | ret = -ENOTTY; | |
dc93a70c | 376 | |
86a5ef7d | 377 | return ret; |
dc93a70c HV |
378 | } |
379 | ||
ecc6517d BL |
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 | ||
dc93a70c HV |
397 | static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm) |
398 | { | |
399 | struct video_device *vdev = video_devdata(filp); | |
ee6869af HV |
400 | int ret = -ENODEV; |
401 | ||
402 | if (!vdev->fops->mmap) | |
403 | return ret; | |
5126f259 HV |
404 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) && |
405 | mutex_lock_interruptible(vdev->lock)) | |
2877842d | 406 | return -ERESTARTSYS; |
ee6869af HV |
407 | if (video_is_registered(vdev)) |
408 | ret = vdev->fops->mmap(filp, vm); | |
5126f259 | 409 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) |
ee6869af HV |
410 | mutex_unlock(vdev->lock); |
411 | return ret; | |
dc93a70c HV |
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; | |
65d9ff9c | 418 | int ret = 0; |
dc93a70c HV |
419 | |
420 | /* Check if the video device is available */ | |
421 | mutex_lock(&videodev_lock); | |
422 | vdev = video_devdata(filp); | |
ee6869af | 423 | /* return ENODEV if the video device has already been removed. */ |
ca9afe6f | 424 | if (vdev == NULL || !video_is_registered(vdev)) { |
dc93a70c HV |
425 | mutex_unlock(&videodev_lock); |
426 | return -ENODEV; | |
427 | } | |
428 | /* and increase the device refcount */ | |
429 | video_get(vdev); | |
430 | mutex_unlock(&videodev_lock); | |
ee6869af | 431 | if (vdev->fops->open) { |
5126f259 HV |
432 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) && |
433 | mutex_lock_interruptible(vdev->lock)) { | |
2877842d HV |
434 | ret = -ERESTARTSYS; |
435 | goto err; | |
436 | } | |
ee6869af HV |
437 | if (video_is_registered(vdev)) |
438 | ret = vdev->fops->open(filp); | |
439 | else | |
440 | ret = -ENODEV; | |
5126f259 | 441 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) |
ee6869af HV |
442 | mutex_unlock(vdev->lock); |
443 | } | |
65d9ff9c | 444 | |
2877842d | 445 | err: |
dc93a70c | 446 | /* decrease the refcount in case of an error */ |
c064b8ea | 447 | if (ret) |
dc93a70c HV |
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); | |
65d9ff9c HV |
456 | int ret = 0; |
457 | ||
ee6869af | 458 | if (vdev->fops->release) { |
5126f259 | 459 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) |
ee6869af | 460 | mutex_lock(vdev->lock); |
65d9ff9c | 461 | vdev->fops->release(filp); |
5126f259 | 462 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) |
ee6869af HV |
463 | mutex_unlock(vdev->lock); |
464 | } | |
dc93a70c HV |
465 | /* decrease the refcount unconditionally since the release() |
466 | return value is ignored. */ | |
467 | video_put(vdev); | |
468 | return ret; | |
469 | } | |
470 | ||
dc93a70c HV |
471 | static const struct file_operations v4l2_fops = { |
472 | .owner = THIS_MODULE, | |
473 | .read = v4l2_read, | |
474 | .write = v4l2_write, | |
475 | .open = v4l2_open, | |
ecc6517d | 476 | .get_unmapped_area = v4l2_get_unmapped_area, |
dc93a70c | 477 | .mmap = v4l2_mmap, |
86a5ef7d | 478 | .unlocked_ioctl = v4l2_ioctl, |
dc93a70c | 479 | #ifdef CONFIG_COMPAT |
9bb7cde7 | 480 | .compat_ioctl = v4l2_compat_ioctl32, |
dc93a70c HV |
481 | #endif |
482 | .release = v4l2_release, | |
483 | .poll = v4l2_poll, | |
484 | .llseek = no_llseek, | |
485 | }; | |
486 | ||
27a5e6d3 | 487 | /** |
7ae0cd9b | 488 | * get_index - assign stream index number based on parent device |
dc93a70c | 489 | * @vdev: video_device to assign index number to, vdev->parent should be assigned |
27a5e6d3 | 490 | * |
dc93a70c | 491 | * Note that when this is called the new device has not yet been registered |
7ae0cd9b | 492 | * in the video_device array, but it was able to obtain a minor number. |
27a5e6d3 | 493 | * |
7ae0cd9b HV |
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. | |
27a5e6d3 | 499 | */ |
7ae0cd9b | 500 | static int get_index(struct video_device *vdev) |
27a5e6d3 | 501 | { |
775a05dd HV |
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); | |
27a5e6d3 HV |
505 | int i; |
506 | ||
7ae0cd9b | 507 | /* Some drivers do not set the parent. In that case always return 0. */ |
806e5b7c | 508 | if (vdev->parent == NULL) |
7ae0cd9b | 509 | return 0; |
775a05dd HV |
510 | |
511 | bitmap_zero(used, VIDEO_NUM_DEVICES); | |
806e5b7c | 512 | |
27a5e6d3 HV |
513 | for (i = 0; i < VIDEO_NUM_DEVICES; i++) { |
514 | if (video_device[i] != NULL && | |
5e85e732 | 515 | video_device[i]->parent == vdev->parent) { |
775a05dd | 516 | set_bit(video_device[i]->index, used); |
27a5e6d3 HV |
517 | } |
518 | } | |
519 | ||
7ae0cd9b | 520 | return find_first_zero_bit(used, VIDEO_NUM_DEVICES); |
27a5e6d3 HV |
521 | } |
522 | ||
48ea0be0 HV |
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); | |
a5ee6e41 | 659 | if (ops->vidioc_g_parm || vdev->vfl_type == VFL_TYPE_GRABBER) |
48ea0be0 HV |
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); | |
0b5dabed HV |
682 | SET_VALID_IOCTL(ops, VIDIOC_ENUM_DV_TIMINGS, vidioc_enum_dv_timings); |
683 | SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings); | |
c1e32096 | 684 | SET_VALID_IOCTL(ops, VIDIOC_DV_TIMINGS_CAP, vidioc_dv_timings_cap); |
48ea0be0 HV |
685 | /* yes, really vidioc_subscribe_event */ |
686 | SET_VALID_IOCTL(ops, VIDIOC_DQEVENT, vidioc_subscribe_event); | |
687 | SET_VALID_IOCTL(ops, VIDIOC_SUBSCRIBE_EVENT, vidioc_subscribe_event); | |
688 | SET_VALID_IOCTL(ops, VIDIOC_UNSUBSCRIBE_EVENT, vidioc_unsubscribe_event); | |
689 | SET_VALID_IOCTL(ops, VIDIOC_CREATE_BUFS, vidioc_create_bufs); | |
690 | SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, vidioc_prepare_buf); | |
691 | bitmap_andnot(vdev->valid_ioctls, valid_ioctls, vdev->valid_ioctls, | |
692 | BASE_VIDIOC_PRIVATE); | |
693 | } | |
694 | ||
27a5e6d3 | 695 | /** |
2096a5dc | 696 | * __video_register_device - register video4linux devices |
dc93a70c | 697 | * @vdev: video device structure we want to register |
27a5e6d3 | 698 | * @type: type of device to register |
22e22125 | 699 | * @nr: which device node number (0 == /dev/video0, 1 == /dev/video1, ... |
27a5e6d3 | 700 | * -1 == first free) |
6b5270d2 HV |
701 | * @warn_if_nr_in_use: warn if the desired device node number |
702 | * was already in use and another number was chosen instead. | |
2096a5dc | 703 | * @owner: module that owns the video device node |
27a5e6d3 | 704 | * |
22e22125 HV |
705 | * The registration code assigns minor numbers and device node numbers |
706 | * based on the requested type and registers the new device node with | |
707 | * the kernel. | |
46b63377 HV |
708 | * |
709 | * This function assumes that struct video_device was zeroed when it | |
710 | * was allocated and does not contain any stale date. | |
711 | * | |
22e22125 HV |
712 | * An error is returned if no free minor or device node number could be |
713 | * found, or if the registration of the device node failed. | |
27a5e6d3 HV |
714 | * |
715 | * Zero is returned on success. | |
716 | * | |
717 | * Valid types are | |
718 | * | |
719 | * %VFL_TYPE_GRABBER - A frame grabber | |
720 | * | |
27a5e6d3 HV |
721 | * %VFL_TYPE_VBI - Vertical blank data (undecoded) |
722 | * | |
723 | * %VFL_TYPE_RADIO - A radio card | |
2096a5dc LP |
724 | * |
725 | * %VFL_TYPE_SUBDEV - A subdevice | |
27a5e6d3 | 726 | */ |
2096a5dc LP |
727 | int __video_register_device(struct video_device *vdev, int type, int nr, |
728 | int warn_if_nr_in_use, struct module *owner) | |
27a5e6d3 HV |
729 | { |
730 | int i = 0; | |
27a5e6d3 | 731 | int ret; |
dd89601d HV |
732 | int minor_offset = 0; |
733 | int minor_cnt = VIDEO_NUM_DEVICES; | |
734 | const char *name_base; | |
27a5e6d3 | 735 | |
dc93a70c HV |
736 | /* A minor value of -1 marks this video device as never |
737 | having been registered */ | |
428c8d19 | 738 | vdev->minor = -1; |
ee7aa9f8 | 739 | |
dc93a70c | 740 | /* the release callback MUST be present */ |
1fc2b5f7 | 741 | if (WARN_ON(!vdev->release)) |
f3b9f50e HK |
742 | return -EINVAL; |
743 | ||
1babcb46 SA |
744 | /* v4l2_fh support */ |
745 | spin_lock_init(&vdev->fh_lock); | |
746 | INIT_LIST_HEAD(&vdev->fh_list); | |
747 | ||
dc93a70c | 748 | /* Part 1: check device type */ |
27a5e6d3 HV |
749 | switch (type) { |
750 | case VFL_TYPE_GRABBER: | |
27a5e6d3 HV |
751 | name_base = "video"; |
752 | break; | |
27a5e6d3 | 753 | case VFL_TYPE_VBI: |
27a5e6d3 HV |
754 | name_base = "vbi"; |
755 | break; | |
756 | case VFL_TYPE_RADIO: | |
27a5e6d3 HV |
757 | name_base = "radio"; |
758 | break; | |
2096a5dc LP |
759 | case VFL_TYPE_SUBDEV: |
760 | name_base = "v4l-subdev"; | |
761 | break; | |
27a5e6d3 HV |
762 | default: |
763 | printk(KERN_ERR "%s called with unknown type: %d\n", | |
764 | __func__, type); | |
46f2c21c | 765 | return -EINVAL; |
27a5e6d3 HV |
766 | } |
767 | ||
dc93a70c HV |
768 | vdev->vfl_type = type; |
769 | vdev->cdev = NULL; | |
11bbc1ca HV |
770 | if (vdev->v4l2_dev) { |
771 | if (vdev->v4l2_dev->dev) | |
772 | vdev->parent = vdev->v4l2_dev->dev; | |
773 | if (vdev->ctrl_handler == NULL) | |
774 | vdev->ctrl_handler = vdev->v4l2_dev->ctrl_handler; | |
b1a873a3 HV |
775 | /* If the prio state pointer is NULL, then use the v4l2_device |
776 | prio state. */ | |
777 | if (vdev->prio == NULL) | |
0f62fd6a | 778 | vdev->prio = &vdev->v4l2_dev->prio; |
11bbc1ca | 779 | } |
dd89601d | 780 | |
22e22125 | 781 | /* Part 2: find a free minor, device node number and device index. */ |
dd89601d HV |
782 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES |
783 | /* Keep the ranges for the first four types for historical | |
784 | * reasons. | |
785 | * Newer devices (not yet in place) should use the range | |
786 | * of 128-191 and just pick the first free minor there | |
787 | * (new style). */ | |
788 | switch (type) { | |
789 | case VFL_TYPE_GRABBER: | |
790 | minor_offset = 0; | |
791 | minor_cnt = 64; | |
792 | break; | |
793 | case VFL_TYPE_RADIO: | |
794 | minor_offset = 64; | |
795 | minor_cnt = 64; | |
796 | break; | |
dd89601d HV |
797 | case VFL_TYPE_VBI: |
798 | minor_offset = 224; | |
799 | minor_cnt = 32; | |
800 | break; | |
801 | default: | |
802 | minor_offset = 128; | |
803 | minor_cnt = 64; | |
804 | break; | |
805 | } | |
806 | #endif | |
807 | ||
22e22125 | 808 | /* Pick a device node number */ |
27a5e6d3 | 809 | mutex_lock(&videodev_lock); |
5062cb70 | 810 | nr = devnode_find(vdev, nr == -1 ? 0 : nr, minor_cnt); |
dd89601d | 811 | if (nr == minor_cnt) |
5062cb70 | 812 | nr = devnode_find(vdev, 0, minor_cnt); |
dd89601d | 813 | if (nr == minor_cnt) { |
22e22125 | 814 | printk(KERN_ERR "could not get a free device node number\n"); |
dd89601d HV |
815 | mutex_unlock(&videodev_lock); |
816 | return -ENFILE; | |
27a5e6d3 | 817 | } |
dd89601d | 818 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES |
22e22125 | 819 | /* 1-on-1 mapping of device node number to minor number */ |
dd89601d HV |
820 | i = nr; |
821 | #else | |
22e22125 HV |
822 | /* The device node number and minor numbers are independent, so |
823 | we just find the first free minor number. */ | |
dd89601d HV |
824 | for (i = 0; i < VIDEO_NUM_DEVICES; i++) |
825 | if (video_device[i] == NULL) | |
826 | break; | |
827 | if (i == VIDEO_NUM_DEVICES) { | |
828 | mutex_unlock(&videodev_lock); | |
829 | printk(KERN_ERR "could not get a free minor\n"); | |
830 | return -ENFILE; | |
831 | } | |
832 | #endif | |
dc93a70c HV |
833 | vdev->minor = i + minor_offset; |
834 | vdev->num = nr; | |
5062cb70 HV |
835 | devnode_set(vdev); |
836 | ||
dc93a70c HV |
837 | /* Should not happen since we thought this minor was free */ |
838 | WARN_ON(video_device[vdev->minor] != NULL); | |
7ae0cd9b | 839 | vdev->index = get_index(vdev); |
27a5e6d3 | 840 | mutex_unlock(&videodev_lock); |
5126f259 HV |
841 | /* if no lock was passed, then make sure the LOCK_ALL_FOPS bit is |
842 | clear and warn if it wasn't. */ | |
843 | if (vdev->lock == NULL) | |
844 | WARN_ON(test_and_clear_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)); | |
27a5e6d3 | 845 | |
48ea0be0 HV |
846 | if (vdev->ioctl_ops) |
847 | determine_valid_ioctls(vdev); | |
848 | ||
dc93a70c HV |
849 | /* Part 3: Initialize the character device */ |
850 | vdev->cdev = cdev_alloc(); | |
851 | if (vdev->cdev == NULL) { | |
852 | ret = -ENOMEM; | |
853 | goto cleanup; | |
854 | } | |
86a5ef7d | 855 | vdev->cdev->ops = &v4l2_fops; |
2096a5dc | 856 | vdev->cdev->owner = owner; |
dc93a70c | 857 | ret = cdev_add(vdev->cdev, MKDEV(VIDEO_MAJOR, vdev->minor), 1); |
7f8ecfab HV |
858 | if (ret < 0) { |
859 | printk(KERN_ERR "%s: cdev_add failed\n", __func__); | |
dc93a70c HV |
860 | kfree(vdev->cdev); |
861 | vdev->cdev = NULL; | |
862 | goto cleanup; | |
7f8ecfab | 863 | } |
dc93a70c HV |
864 | |
865 | /* Part 4: register the device with sysfs */ | |
dc93a70c HV |
866 | vdev->dev.class = &video_class; |
867 | vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor); | |
868 | if (vdev->parent) | |
869 | vdev->dev.parent = vdev->parent; | |
22e22125 | 870 | dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num); |
dc93a70c | 871 | ret = device_register(&vdev->dev); |
27a5e6d3 HV |
872 | if (ret < 0) { |
873 | printk(KERN_ERR "%s: device_register failed\n", __func__); | |
dc93a70c | 874 | goto cleanup; |
27a5e6d3 | 875 | } |
dc93a70c HV |
876 | /* Register the release callback that will be called when the last |
877 | reference to the device goes away. */ | |
878 | vdev->dev.release = v4l2_device_release; | |
27a5e6d3 | 879 | |
6b5270d2 | 880 | if (nr != -1 && nr != vdev->num && warn_if_nr_in_use) |
eac8ea53 LP |
881 | printk(KERN_WARNING "%s: requested %s%d, got %s\n", __func__, |
882 | name_base, nr, video_device_node_name(vdev)); | |
bedf8bcf HV |
883 | |
884 | /* Increase v4l2_device refcount */ | |
885 | if (vdev->v4l2_dev) | |
886 | v4l2_device_get(vdev->v4l2_dev); | |
887 | ||
2c0ab67b LP |
888 | #if defined(CONFIG_MEDIA_CONTROLLER) |
889 | /* Part 5: Register the entity. */ | |
c4f0b78a LP |
890 | if (vdev->v4l2_dev && vdev->v4l2_dev->mdev && |
891 | vdev->vfl_type != VFL_TYPE_SUBDEV) { | |
2c0ab67b LP |
892 | vdev->entity.type = MEDIA_ENT_T_DEVNODE_V4L; |
893 | vdev->entity.name = vdev->name; | |
fa5034c6 CL |
894 | vdev->entity.info.v4l.major = VIDEO_MAJOR; |
895 | vdev->entity.info.v4l.minor = vdev->minor; | |
2c0ab67b LP |
896 | ret = media_device_register_entity(vdev->v4l2_dev->mdev, |
897 | &vdev->entity); | |
898 | if (ret < 0) | |
899 | printk(KERN_WARNING | |
900 | "%s: media_device_register_entity failed\n", | |
901 | __func__); | |
902 | } | |
903 | #endif | |
904 | /* Part 6: Activate this minor. The char device can now be used. */ | |
957b4aa9 | 905 | set_bit(V4L2_FL_REGISTERED, &vdev->flags); |
dc93a70c HV |
906 | mutex_lock(&videodev_lock); |
907 | video_device[vdev->minor] = vdev; | |
908 | mutex_unlock(&videodev_lock); | |
2c0ab67b | 909 | |
dc93a70c | 910 | return 0; |
7f8ecfab | 911 | |
dc93a70c | 912 | cleanup: |
27a5e6d3 | 913 | mutex_lock(&videodev_lock); |
dc93a70c HV |
914 | if (vdev->cdev) |
915 | cdev_del(vdev->cdev); | |
5062cb70 | 916 | devnode_clear(vdev); |
27a5e6d3 | 917 | mutex_unlock(&videodev_lock); |
dc93a70c HV |
918 | /* Mark this video device as never having been registered. */ |
919 | vdev->minor = -1; | |
27a5e6d3 HV |
920 | return ret; |
921 | } | |
2096a5dc | 922 | EXPORT_SYMBOL(__video_register_device); |
6b5270d2 | 923 | |
27a5e6d3 HV |
924 | /** |
925 | * video_unregister_device - unregister a video4linux device | |
dc93a70c | 926 | * @vdev: the device to unregister |
27a5e6d3 | 927 | * |
dc93a70c HV |
928 | * This unregisters the passed device. Future open calls will |
929 | * be met with errors. | |
27a5e6d3 | 930 | */ |
dc93a70c | 931 | void video_unregister_device(struct video_device *vdev) |
27a5e6d3 | 932 | { |
dc93a70c | 933 | /* Check if vdev was ever registered at all */ |
957b4aa9 | 934 | if (!vdev || !video_is_registered(vdev)) |
dc93a70c HV |
935 | return; |
936 | ||
ca9afe6f HV |
937 | mutex_lock(&videodev_lock); |
938 | /* This must be in a critical section to prevent a race with v4l2_open. | |
939 | * Once this bit has been cleared video_get may never be called again. | |
940 | */ | |
957b4aa9 | 941 | clear_bit(V4L2_FL_REGISTERED, &vdev->flags); |
ca9afe6f | 942 | mutex_unlock(&videodev_lock); |
dc93a70c | 943 | device_unregister(&vdev->dev); |
27a5e6d3 HV |
944 | } |
945 | EXPORT_SYMBOL(video_unregister_device); | |
946 | ||
27a5e6d3 HV |
947 | /* |
948 | * Initialise video for linux | |
949 | */ | |
27a5e6d3 HV |
950 | static int __init videodev_init(void) |
951 | { | |
7f8ecfab | 952 | dev_t dev = MKDEV(VIDEO_MAJOR, 0); |
27a5e6d3 HV |
953 | int ret; |
954 | ||
955 | printk(KERN_INFO "Linux video capture interface: v2.00\n"); | |
7f8ecfab HV |
956 | ret = register_chrdev_region(dev, VIDEO_NUM_DEVICES, VIDEO_NAME); |
957 | if (ret < 0) { | |
958 | printk(KERN_WARNING "videodev: unable to get major %d\n", | |
959 | VIDEO_MAJOR); | |
960 | return ret; | |
27a5e6d3 HV |
961 | } |
962 | ||
963 | ret = class_register(&video_class); | |
964 | if (ret < 0) { | |
7f8ecfab | 965 | unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); |
27a5e6d3 HV |
966 | printk(KERN_WARNING "video_dev: class_register failed\n"); |
967 | return -EIO; | |
968 | } | |
969 | ||
970 | return 0; | |
971 | } | |
972 | ||
973 | static void __exit videodev_exit(void) | |
974 | { | |
7f8ecfab HV |
975 | dev_t dev = MKDEV(VIDEO_MAJOR, 0); |
976 | ||
27a5e6d3 | 977 | class_unregister(&video_class); |
7f8ecfab | 978 | unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); |
27a5e6d3 HV |
979 | } |
980 | ||
ee981c6f | 981 | subsys_initcall(videodev_init); |
27a5e6d3 HV |
982 | module_exit(videodev_exit) |
983 | ||
984 | MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@infradead.org>"); | |
985 | MODULE_DESCRIPTION("Device registrar for Video4Linux drivers v2"); | |
986 | MODULE_LICENSE("GPL"); | |
cbb72b0f | 987 | MODULE_ALIAS_CHARDEV_MAJOR(VIDEO_MAJOR); |
27a5e6d3 HV |
988 | |
989 | ||
990 | /* | |
991 | * Local variables: | |
992 | * c-basic-offset: 8 | |
993 | * End: | |
994 | */ |