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 | ||
80131fe0 HV |
49 | static ssize_t show_debug(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, "%i\n", vdev->debug); | |
55 | } | |
56 | ||
57 | static ssize_t set_debug(struct device *cd, struct device_attribute *attr, | |
58 | const char *buf, size_t len) | |
59 | { | |
60 | struct video_device *vdev = to_video_device(cd); | |
61 | int res = 0; | |
62 | u16 value; | |
63 | ||
64 | res = kstrtou16(buf, 0, &value); | |
65 | if (res) | |
66 | return res; | |
67 | ||
68 | vdev->debug = value; | |
69 | return len; | |
70 | } | |
71 | ||
27a5e6d3 HV |
72 | static ssize_t show_name(struct device *cd, |
73 | struct device_attribute *attr, char *buf) | |
74 | { | |
dc93a70c | 75 | struct video_device *vdev = to_video_device(cd); |
bfa8a273 | 76 | |
dc93a70c | 77 | return sprintf(buf, "%.*s\n", (int)sizeof(vdev->name), vdev->name); |
27a5e6d3 HV |
78 | } |
79 | ||
80 | static struct device_attribute video_device_attrs[] = { | |
81 | __ATTR(name, S_IRUGO, show_name, NULL), | |
80131fe0 | 82 | __ATTR(debug, 0644, show_debug, set_debug), |
27a5e6d3 HV |
83 | __ATTR(index, S_IRUGO, show_index, NULL), |
84 | __ATTR_NULL | |
85 | }; | |
86 | ||
7f8ecfab HV |
87 | /* |
88 | * Active devices | |
89 | */ | |
90 | static struct video_device *video_device[VIDEO_NUM_DEVICES]; | |
91 | static DEFINE_MUTEX(videodev_lock); | |
22e22125 | 92 | static DECLARE_BITMAP(devnode_nums[VFL_TYPE_MAX], VIDEO_NUM_DEVICES); |
7f8ecfab | 93 | |
5062cb70 HV |
94 | /* Device node utility functions */ |
95 | ||
96 | /* Note: these utility functions all assume that vfl_type is in the range | |
97 | [0, VFL_TYPE_MAX-1]. */ | |
98 | ||
99 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES | |
100 | /* Return the bitmap corresponding to vfl_type. */ | |
101 | static inline unsigned long *devnode_bits(int vfl_type) | |
102 | { | |
103 | /* Any types not assigned to fixed minor ranges must be mapped to | |
104 | one single bitmap for the purposes of finding a free node number | |
105 | since all those unassigned types use the same minor range. */ | |
226c0eea | 106 | int idx = (vfl_type > VFL_TYPE_RADIO) ? VFL_TYPE_MAX - 1 : vfl_type; |
5062cb70 HV |
107 | |
108 | return devnode_nums[idx]; | |
109 | } | |
110 | #else | |
111 | /* Return the bitmap corresponding to vfl_type. */ | |
112 | static inline unsigned long *devnode_bits(int vfl_type) | |
113 | { | |
114 | return devnode_nums[vfl_type]; | |
115 | } | |
116 | #endif | |
117 | ||
118 | /* Mark device node number vdev->num as used */ | |
119 | static inline void devnode_set(struct video_device *vdev) | |
120 | { | |
121 | set_bit(vdev->num, devnode_bits(vdev->vfl_type)); | |
122 | } | |
123 | ||
124 | /* Mark device node number vdev->num as unused */ | |
125 | static inline void devnode_clear(struct video_device *vdev) | |
126 | { | |
127 | clear_bit(vdev->num, devnode_bits(vdev->vfl_type)); | |
128 | } | |
129 | ||
130 | /* Try to find a free device node number in the range [from, to> */ | |
131 | static inline int devnode_find(struct video_device *vdev, int from, int to) | |
132 | { | |
133 | return find_next_zero_bit(devnode_bits(vdev->vfl_type), to, from); | |
134 | } | |
135 | ||
27a5e6d3 HV |
136 | struct video_device *video_device_alloc(void) |
137 | { | |
bfa8a273 | 138 | return kzalloc(sizeof(struct video_device), GFP_KERNEL); |
27a5e6d3 HV |
139 | } |
140 | EXPORT_SYMBOL(video_device_alloc); | |
141 | ||
dc93a70c | 142 | void video_device_release(struct video_device *vdev) |
27a5e6d3 | 143 | { |
dc93a70c | 144 | kfree(vdev); |
27a5e6d3 HV |
145 | } |
146 | EXPORT_SYMBOL(video_device_release); | |
147 | ||
dc93a70c | 148 | void video_device_release_empty(struct video_device *vdev) |
f9e86b5e HV |
149 | { |
150 | /* Do nothing */ | |
151 | /* Only valid when the video_device struct is a static. */ | |
152 | } | |
153 | EXPORT_SYMBOL(video_device_release_empty); | |
154 | ||
dc93a70c | 155 | static inline void video_get(struct video_device *vdev) |
7f8ecfab | 156 | { |
dc93a70c HV |
157 | get_device(&vdev->dev); |
158 | } | |
159 | ||
160 | static inline void video_put(struct video_device *vdev) | |
161 | { | |
162 | put_device(&vdev->dev); | |
163 | } | |
164 | ||
165 | /* Called when the last user of the video device exits. */ | |
166 | static void v4l2_device_release(struct device *cd) | |
167 | { | |
168 | struct video_device *vdev = to_video_device(cd); | |
bedf8bcf | 169 | struct v4l2_device *v4l2_dev = vdev->v4l2_dev; |
7f8ecfab HV |
170 | |
171 | mutex_lock(&videodev_lock); | |
1fc2b5f7 | 172 | if (WARN_ON(video_device[vdev->minor] != vdev)) { |
dc93a70c | 173 | /* should not happen */ |
1fc2b5f7 | 174 | mutex_unlock(&videodev_lock); |
6ea9a182 HV |
175 | return; |
176 | } | |
7f8ecfab HV |
177 | |
178 | /* Free up this device for reuse */ | |
dc93a70c | 179 | video_device[vdev->minor] = NULL; |
7f8ecfab | 180 | |
dc93a70c HV |
181 | /* Delete the cdev on this minor as well */ |
182 | cdev_del(vdev->cdev); | |
183 | /* Just in case some driver tries to access this from | |
184 | the release() callback. */ | |
185 | vdev->cdev = NULL; | |
7f8ecfab | 186 | |
22e22125 | 187 | /* Mark device node number as free */ |
5062cb70 | 188 | devnode_clear(vdev); |
7f8ecfab | 189 | |
dc93a70c | 190 | mutex_unlock(&videodev_lock); |
27a5e6d3 | 191 | |
c064b8ea | 192 | #if defined(CONFIG_MEDIA_CONTROLLER) |
1fc2b5f7 | 193 | if (v4l2_dev && v4l2_dev->mdev && |
c064b8ea LP |
194 | vdev->vfl_type != VFL_TYPE_SUBDEV) |
195 | media_device_unregister_entity(&vdev->entity); | |
196 | #endif | |
197 | ||
8280b662 HV |
198 | /* Do not call v4l2_device_put if there is no release callback set. |
199 | * Drivers that have no v4l2_device release callback might free the | |
200 | * v4l2_dev instance in the video_device release callback below, so we | |
201 | * must perform this check here. | |
202 | * | |
203 | * TODO: In the long run all drivers that use v4l2_device should use the | |
204 | * v4l2_device release callback. This check will then be unnecessary. | |
205 | */ | |
e58fced2 | 206 | if (v4l2_dev && v4l2_dev->release == NULL) |
8280b662 HV |
207 | v4l2_dev = NULL; |
208 | ||
dc93a70c HV |
209 | /* Release video_device and perform other |
210 | cleanups as needed. */ | |
211 | vdev->release(vdev); | |
bedf8bcf HV |
212 | |
213 | /* Decrease v4l2_device refcount */ | |
214 | if (v4l2_dev) | |
215 | v4l2_device_put(v4l2_dev); | |
27a5e6d3 HV |
216 | } |
217 | ||
218 | static struct class video_class = { | |
219 | .name = VIDEO_NAME, | |
220 | .dev_attrs = video_device_attrs, | |
27a5e6d3 HV |
221 | }; |
222 | ||
27a5e6d3 HV |
223 | struct video_device *video_devdata(struct file *file) |
224 | { | |
225 | return video_device[iminor(file->f_path.dentry->d_inode)]; | |
226 | } | |
227 | EXPORT_SYMBOL(video_devdata); | |
228 | ||
02265493 HV |
229 | |
230 | /* Priority handling */ | |
231 | ||
232 | static inline bool prio_is_valid(enum v4l2_priority prio) | |
233 | { | |
234 | return prio == V4L2_PRIORITY_BACKGROUND || | |
235 | prio == V4L2_PRIORITY_INTERACTIVE || | |
236 | prio == V4L2_PRIORITY_RECORD; | |
237 | } | |
238 | ||
239 | void v4l2_prio_init(struct v4l2_prio_state *global) | |
240 | { | |
241 | memset(global, 0, sizeof(*global)); | |
242 | } | |
243 | EXPORT_SYMBOL(v4l2_prio_init); | |
244 | ||
245 | int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local, | |
246 | enum v4l2_priority new) | |
247 | { | |
248 | if (!prio_is_valid(new)) | |
249 | return -EINVAL; | |
250 | if (*local == new) | |
251 | return 0; | |
252 | ||
253 | atomic_inc(&global->prios[new]); | |
254 | if (prio_is_valid(*local)) | |
255 | atomic_dec(&global->prios[*local]); | |
256 | *local = new; | |
257 | return 0; | |
258 | } | |
259 | EXPORT_SYMBOL(v4l2_prio_change); | |
260 | ||
261 | void v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local) | |
262 | { | |
263 | v4l2_prio_change(global, local, V4L2_PRIORITY_DEFAULT); | |
264 | } | |
265 | EXPORT_SYMBOL(v4l2_prio_open); | |
266 | ||
267 | void v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority local) | |
268 | { | |
269 | if (prio_is_valid(local)) | |
270 | atomic_dec(&global->prios[local]); | |
271 | } | |
272 | EXPORT_SYMBOL(v4l2_prio_close); | |
273 | ||
274 | enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global) | |
275 | { | |
276 | if (atomic_read(&global->prios[V4L2_PRIORITY_RECORD]) > 0) | |
277 | return V4L2_PRIORITY_RECORD; | |
278 | if (atomic_read(&global->prios[V4L2_PRIORITY_INTERACTIVE]) > 0) | |
279 | return V4L2_PRIORITY_INTERACTIVE; | |
280 | if (atomic_read(&global->prios[V4L2_PRIORITY_BACKGROUND]) > 0) | |
281 | return V4L2_PRIORITY_BACKGROUND; | |
282 | return V4L2_PRIORITY_UNSET; | |
283 | } | |
284 | EXPORT_SYMBOL(v4l2_prio_max); | |
285 | ||
286 | int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority local) | |
287 | { | |
288 | return (local < v4l2_prio_max(global)) ? -EBUSY : 0; | |
289 | } | |
290 | EXPORT_SYMBOL(v4l2_prio_check); | |
291 | ||
292 | ||
dc93a70c HV |
293 | static ssize_t v4l2_read(struct file *filp, char __user *buf, |
294 | size_t sz, loff_t *off) | |
295 | { | |
296 | struct video_device *vdev = video_devdata(filp); | |
2877842d | 297 | int ret = -ENODEV; |
dc93a70c HV |
298 | |
299 | if (!vdev->fops->read) | |
300 | return -EINVAL; | |
5126f259 HV |
301 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) && |
302 | mutex_lock_interruptible(vdev->lock)) | |
2877842d | 303 | return -ERESTARTSYS; |
ee6869af HV |
304 | if (video_is_registered(vdev)) |
305 | ret = vdev->fops->read(filp, buf, sz, off); | |
5126f259 | 306 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) |
ee6869af | 307 | mutex_unlock(vdev->lock); |
cc4b7e7f HV |
308 | if (vdev->debug) |
309 | printk(KERN_DEBUG "%s: read: %zd (%d)\n", | |
310 | video_device_node_name(vdev), sz, ret); | |
ee6869af | 311 | return ret; |
dc93a70c HV |
312 | } |
313 | ||
314 | static ssize_t v4l2_write(struct file *filp, const char __user *buf, | |
315 | size_t sz, loff_t *off) | |
316 | { | |
317 | struct video_device *vdev = video_devdata(filp); | |
2877842d | 318 | int ret = -ENODEV; |
dc93a70c HV |
319 | |
320 | if (!vdev->fops->write) | |
321 | return -EINVAL; | |
5126f259 HV |
322 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) && |
323 | mutex_lock_interruptible(vdev->lock)) | |
2877842d | 324 | return -ERESTARTSYS; |
ee6869af HV |
325 | if (video_is_registered(vdev)) |
326 | ret = vdev->fops->write(filp, buf, sz, off); | |
5126f259 | 327 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) |
ee6869af | 328 | mutex_unlock(vdev->lock); |
cc4b7e7f HV |
329 | if (vdev->debug) |
330 | printk(KERN_DEBUG "%s: write: %zd (%d)\n", | |
331 | video_device_node_name(vdev), sz, ret); | |
ee6869af | 332 | return ret; |
dc93a70c HV |
333 | } |
334 | ||
335 | static unsigned int v4l2_poll(struct file *filp, struct poll_table_struct *poll) | |
336 | { | |
337 | struct video_device *vdev = video_devdata(filp); | |
2877842d | 338 | int ret = POLLERR | POLLHUP; |
ee6869af HV |
339 | |
340 | if (!vdev->fops->poll) | |
2877842d | 341 | return DEFAULT_POLLMASK; |
5126f259 | 342 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) |
ee6869af HV |
343 | mutex_lock(vdev->lock); |
344 | if (video_is_registered(vdev)) | |
345 | ret = vdev->fops->poll(filp, poll); | |
5126f259 | 346 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) |
ee6869af | 347 | mutex_unlock(vdev->lock); |
cc4b7e7f HV |
348 | if (vdev->debug) |
349 | printk(KERN_DEBUG "%s: poll: %08x\n", | |
350 | video_device_node_name(vdev), ret); | |
ee6869af | 351 | return ret; |
dc93a70c HV |
352 | } |
353 | ||
86a5ef7d | 354 | static long v4l2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
dc93a70c HV |
355 | { |
356 | struct video_device *vdev = video_devdata(filp); | |
72420630 | 357 | int ret = -ENODEV; |
dc93a70c | 358 | |
86a5ef7d | 359 | if (vdev->fops->unlocked_ioctl) { |
5a5adf6b | 360 | struct mutex *lock = v4l2_ioctl_get_lock(vdev, cmd); |
8ab75e3e | 361 | |
5a5adf6b HV |
362 | if (lock && mutex_lock_interruptible(lock)) |
363 | return -ERESTARTSYS; | |
72420630 MCC |
364 | if (video_is_registered(vdev)) |
365 | ret = vdev->fops->unlocked_ioctl(filp, cmd, arg); | |
5a5adf6b HV |
366 | if (lock) |
367 | mutex_unlock(lock); | |
86a5ef7d | 368 | } else if (vdev->fops->ioctl) { |
879aa24d HV |
369 | /* This code path is a replacement for the BKL. It is a major |
370 | * hack but it will have to do for those drivers that are not | |
371 | * yet converted to use unlocked_ioctl. | |
372 | * | |
373 | * There are two options: if the driver implements struct | |
374 | * v4l2_device, then the lock defined there is used to | |
375 | * serialize the ioctls. Otherwise the v4l2 core lock defined | |
376 | * below is used. This lock is really bad since it serializes | |
377 | * completely independent devices. | |
378 | * | |
379 | * Both variants suffer from the same problem: if the driver | |
380 | * sleeps, then it blocks all ioctls since the lock is still | |
381 | * held. This is very common for VIDIOC_DQBUF since that | |
382 | * normally waits for a frame to arrive. As a result any other | |
383 | * ioctl calls will proceed very, very slowly since each call | |
384 | * will have to wait for the VIDIOC_QBUF to finish. Things that | |
385 | * should take 0.01s may now take 10-20 seconds. | |
386 | * | |
387 | * The workaround is to *not* take the lock for VIDIOC_DQBUF. | |
388 | * This actually works OK for videobuf-based drivers, since | |
389 | * videobuf will take its own internal lock. | |
390 | */ | |
0edf2e5e | 391 | static DEFINE_MUTEX(v4l2_ioctl_mutex); |
879aa24d HV |
392 | struct mutex *m = vdev->v4l2_dev ? |
393 | &vdev->v4l2_dev->ioctl_lock : &v4l2_ioctl_mutex; | |
0edf2e5e | 394 | |
879aa24d HV |
395 | if (cmd != VIDIOC_DQBUF && mutex_lock_interruptible(m)) |
396 | return -ERESTARTSYS; | |
72420630 MCC |
397 | if (video_is_registered(vdev)) |
398 | ret = vdev->fops->ioctl(filp, cmd, arg); | |
879aa24d HV |
399 | if (cmd != VIDIOC_DQBUF) |
400 | mutex_unlock(m); | |
86a5ef7d AB |
401 | } else |
402 | ret = -ENOTTY; | |
dc93a70c | 403 | |
86a5ef7d | 404 | return ret; |
dc93a70c HV |
405 | } |
406 | ||
ecc6517d BL |
407 | #ifdef CONFIG_MMU |
408 | #define v4l2_get_unmapped_area NULL | |
409 | #else | |
410 | static unsigned long v4l2_get_unmapped_area(struct file *filp, | |
411 | unsigned long addr, unsigned long len, unsigned long pgoff, | |
412 | unsigned long flags) | |
413 | { | |
414 | struct video_device *vdev = video_devdata(filp); | |
cc4b7e7f | 415 | int ret; |
ecc6517d BL |
416 | |
417 | if (!vdev->fops->get_unmapped_area) | |
418 | return -ENOSYS; | |
419 | if (!video_is_registered(vdev)) | |
420 | return -ENODEV; | |
cc4b7e7f HV |
421 | ret = vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags); |
422 | if (vdev->debug) | |
423 | printk(KERN_DEBUG "%s: get_unmapped_area (%d)\n", | |
424 | video_device_node_name(vdev), ret); | |
425 | return ret; | |
ecc6517d BL |
426 | } |
427 | #endif | |
428 | ||
dc93a70c HV |
429 | static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm) |
430 | { | |
431 | struct video_device *vdev = video_devdata(filp); | |
ee6869af HV |
432 | int ret = -ENODEV; |
433 | ||
434 | if (!vdev->fops->mmap) | |
435 | return ret; | |
5126f259 HV |
436 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) && |
437 | mutex_lock_interruptible(vdev->lock)) | |
2877842d | 438 | return -ERESTARTSYS; |
ee6869af HV |
439 | if (video_is_registered(vdev)) |
440 | ret = vdev->fops->mmap(filp, vm); | |
5126f259 | 441 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) |
ee6869af | 442 | mutex_unlock(vdev->lock); |
cc4b7e7f HV |
443 | if (vdev->debug) |
444 | printk(KERN_DEBUG "%s: mmap (%d)\n", | |
445 | video_device_node_name(vdev), ret); | |
ee6869af | 446 | return ret; |
dc93a70c HV |
447 | } |
448 | ||
449 | /* Override for the open function */ | |
450 | static int v4l2_open(struct inode *inode, struct file *filp) | |
451 | { | |
452 | struct video_device *vdev; | |
65d9ff9c | 453 | int ret = 0; |
dc93a70c HV |
454 | |
455 | /* Check if the video device is available */ | |
456 | mutex_lock(&videodev_lock); | |
457 | vdev = video_devdata(filp); | |
ee6869af | 458 | /* return ENODEV if the video device has already been removed. */ |
ca9afe6f | 459 | if (vdev == NULL || !video_is_registered(vdev)) { |
dc93a70c HV |
460 | mutex_unlock(&videodev_lock); |
461 | return -ENODEV; | |
462 | } | |
463 | /* and increase the device refcount */ | |
464 | video_get(vdev); | |
465 | mutex_unlock(&videodev_lock); | |
ee6869af | 466 | if (vdev->fops->open) { |
5126f259 HV |
467 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) && |
468 | mutex_lock_interruptible(vdev->lock)) { | |
2877842d HV |
469 | ret = -ERESTARTSYS; |
470 | goto err; | |
471 | } | |
ee6869af HV |
472 | if (video_is_registered(vdev)) |
473 | ret = vdev->fops->open(filp); | |
474 | else | |
475 | ret = -ENODEV; | |
5126f259 | 476 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) |
ee6869af HV |
477 | mutex_unlock(vdev->lock); |
478 | } | |
65d9ff9c | 479 | |
2877842d | 480 | err: |
dc93a70c | 481 | /* decrease the refcount in case of an error */ |
c064b8ea | 482 | if (ret) |
dc93a70c | 483 | video_put(vdev); |
cc4b7e7f HV |
484 | if (vdev->debug) |
485 | printk(KERN_DEBUG "%s: open (%d)\n", | |
486 | video_device_node_name(vdev), ret); | |
dc93a70c HV |
487 | return ret; |
488 | } | |
489 | ||
490 | /* Override for the release function */ | |
491 | static int v4l2_release(struct inode *inode, struct file *filp) | |
492 | { | |
493 | struct video_device *vdev = video_devdata(filp); | |
65d9ff9c HV |
494 | int ret = 0; |
495 | ||
ee6869af | 496 | if (vdev->fops->release) { |
5126f259 | 497 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) |
ee6869af | 498 | mutex_lock(vdev->lock); |
65d9ff9c | 499 | vdev->fops->release(filp); |
5126f259 | 500 | if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)) |
ee6869af HV |
501 | mutex_unlock(vdev->lock); |
502 | } | |
dc93a70c HV |
503 | /* decrease the refcount unconditionally since the release() |
504 | return value is ignored. */ | |
505 | video_put(vdev); | |
cc4b7e7f HV |
506 | if (vdev->debug) |
507 | printk(KERN_DEBUG "%s: release\n", | |
508 | video_device_node_name(vdev)); | |
dc93a70c HV |
509 | return ret; |
510 | } | |
511 | ||
dc93a70c HV |
512 | static const struct file_operations v4l2_fops = { |
513 | .owner = THIS_MODULE, | |
514 | .read = v4l2_read, | |
515 | .write = v4l2_write, | |
516 | .open = v4l2_open, | |
ecc6517d | 517 | .get_unmapped_area = v4l2_get_unmapped_area, |
dc93a70c | 518 | .mmap = v4l2_mmap, |
86a5ef7d | 519 | .unlocked_ioctl = v4l2_ioctl, |
dc93a70c | 520 | #ifdef CONFIG_COMPAT |
9bb7cde7 | 521 | .compat_ioctl = v4l2_compat_ioctl32, |
dc93a70c HV |
522 | #endif |
523 | .release = v4l2_release, | |
524 | .poll = v4l2_poll, | |
525 | .llseek = no_llseek, | |
526 | }; | |
527 | ||
27a5e6d3 | 528 | /** |
7ae0cd9b | 529 | * get_index - assign stream index number based on parent device |
dc93a70c | 530 | * @vdev: video_device to assign index number to, vdev->parent should be assigned |
27a5e6d3 | 531 | * |
dc93a70c | 532 | * Note that when this is called the new device has not yet been registered |
7ae0cd9b | 533 | * in the video_device array, but it was able to obtain a minor number. |
27a5e6d3 | 534 | * |
7ae0cd9b HV |
535 | * This means that we can always obtain a free stream index number since |
536 | * the worst case scenario is that there are VIDEO_NUM_DEVICES - 1 slots in | |
537 | * use of the video_device array. | |
538 | * | |
539 | * Returns a free index number. | |
27a5e6d3 | 540 | */ |
7ae0cd9b | 541 | static int get_index(struct video_device *vdev) |
27a5e6d3 | 542 | { |
775a05dd HV |
543 | /* This can be static since this function is called with the global |
544 | videodev_lock held. */ | |
545 | static DECLARE_BITMAP(used, VIDEO_NUM_DEVICES); | |
27a5e6d3 HV |
546 | int i; |
547 | ||
7ae0cd9b | 548 | /* Some drivers do not set the parent. In that case always return 0. */ |
806e5b7c | 549 | if (vdev->parent == NULL) |
7ae0cd9b | 550 | return 0; |
775a05dd HV |
551 | |
552 | bitmap_zero(used, VIDEO_NUM_DEVICES); | |
806e5b7c | 553 | |
27a5e6d3 HV |
554 | for (i = 0; i < VIDEO_NUM_DEVICES; i++) { |
555 | if (video_device[i] != NULL && | |
5e85e732 | 556 | video_device[i]->parent == vdev->parent) { |
775a05dd | 557 | set_bit(video_device[i]->index, used); |
27a5e6d3 HV |
558 | } |
559 | } | |
560 | ||
7ae0cd9b | 561 | return find_first_zero_bit(used, VIDEO_NUM_DEVICES); |
27a5e6d3 HV |
562 | } |
563 | ||
48ea0be0 HV |
564 | #define SET_VALID_IOCTL(ops, cmd, op) \ |
565 | if (ops->op) \ | |
566 | set_bit(_IOC_NR(cmd), valid_ioctls) | |
567 | ||
568 | /* This determines which ioctls are actually implemented in the driver. | |
569 | It's a one-time thing which simplifies video_ioctl2 as it can just do | |
570 | a bit test. | |
571 | ||
572 | Note that drivers can override this by setting bits to 1 in | |
573 | vdev->valid_ioctls. If an ioctl is marked as 1 when this function is | |
574 | called, then that ioctl will actually be marked as unimplemented. | |
575 | ||
576 | It does that by first setting up the local valid_ioctls bitmap, and | |
577 | at the end do a: | |
578 | ||
579 | vdev->valid_ioctls = valid_ioctls & ~(vdev->valid_ioctls) | |
580 | */ | |
581 | static void determine_valid_ioctls(struct video_device *vdev) | |
582 | { | |
583 | DECLARE_BITMAP(valid_ioctls, BASE_VIDIOC_PRIVATE); | |
584 | const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops; | |
585 | ||
586 | bitmap_zero(valid_ioctls, BASE_VIDIOC_PRIVATE); | |
587 | ||
588 | SET_VALID_IOCTL(ops, VIDIOC_QUERYCAP, vidioc_querycap); | |
589 | if (ops->vidioc_g_priority || | |
590 | test_bit(V4L2_FL_USE_FH_PRIO, &vdev->flags)) | |
591 | set_bit(_IOC_NR(VIDIOC_G_PRIORITY), valid_ioctls); | |
592 | if (ops->vidioc_s_priority || | |
593 | test_bit(V4L2_FL_USE_FH_PRIO, &vdev->flags)) | |
594 | set_bit(_IOC_NR(VIDIOC_S_PRIORITY), valid_ioctls); | |
595 | if (ops->vidioc_enum_fmt_vid_cap || | |
596 | ops->vidioc_enum_fmt_vid_out || | |
597 | ops->vidioc_enum_fmt_vid_cap_mplane || | |
598 | ops->vidioc_enum_fmt_vid_out_mplane || | |
599 | ops->vidioc_enum_fmt_vid_overlay || | |
600 | ops->vidioc_enum_fmt_type_private) | |
601 | set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls); | |
602 | if (ops->vidioc_g_fmt_vid_cap || | |
603 | ops->vidioc_g_fmt_vid_out || | |
604 | ops->vidioc_g_fmt_vid_cap_mplane || | |
605 | ops->vidioc_g_fmt_vid_out_mplane || | |
606 | ops->vidioc_g_fmt_vid_overlay || | |
607 | ops->vidioc_g_fmt_vbi_cap || | |
608 | ops->vidioc_g_fmt_vid_out_overlay || | |
609 | ops->vidioc_g_fmt_vbi_out || | |
610 | ops->vidioc_g_fmt_sliced_vbi_cap || | |
611 | ops->vidioc_g_fmt_sliced_vbi_out || | |
612 | ops->vidioc_g_fmt_type_private) | |
613 | set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); | |
614 | if (ops->vidioc_s_fmt_vid_cap || | |
615 | ops->vidioc_s_fmt_vid_out || | |
616 | ops->vidioc_s_fmt_vid_cap_mplane || | |
617 | ops->vidioc_s_fmt_vid_out_mplane || | |
618 | ops->vidioc_s_fmt_vid_overlay || | |
619 | ops->vidioc_s_fmt_vbi_cap || | |
620 | ops->vidioc_s_fmt_vid_out_overlay || | |
621 | ops->vidioc_s_fmt_vbi_out || | |
622 | ops->vidioc_s_fmt_sliced_vbi_cap || | |
623 | ops->vidioc_s_fmt_sliced_vbi_out || | |
624 | ops->vidioc_s_fmt_type_private) | |
625 | set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); | |
626 | if (ops->vidioc_try_fmt_vid_cap || | |
627 | ops->vidioc_try_fmt_vid_out || | |
628 | ops->vidioc_try_fmt_vid_cap_mplane || | |
629 | ops->vidioc_try_fmt_vid_out_mplane || | |
630 | ops->vidioc_try_fmt_vid_overlay || | |
631 | ops->vidioc_try_fmt_vbi_cap || | |
632 | ops->vidioc_try_fmt_vid_out_overlay || | |
633 | ops->vidioc_try_fmt_vbi_out || | |
634 | ops->vidioc_try_fmt_sliced_vbi_cap || | |
635 | ops->vidioc_try_fmt_sliced_vbi_out || | |
636 | ops->vidioc_try_fmt_type_private) | |
637 | set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); | |
638 | SET_VALID_IOCTL(ops, VIDIOC_REQBUFS, vidioc_reqbufs); | |
639 | SET_VALID_IOCTL(ops, VIDIOC_QUERYBUF, vidioc_querybuf); | |
640 | SET_VALID_IOCTL(ops, VIDIOC_QBUF, vidioc_qbuf); | |
641 | SET_VALID_IOCTL(ops, VIDIOC_DQBUF, vidioc_dqbuf); | |
642 | SET_VALID_IOCTL(ops, VIDIOC_OVERLAY, vidioc_overlay); | |
643 | SET_VALID_IOCTL(ops, VIDIOC_G_FBUF, vidioc_g_fbuf); | |
644 | SET_VALID_IOCTL(ops, VIDIOC_S_FBUF, vidioc_s_fbuf); | |
645 | SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon); | |
646 | SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff); | |
647 | if (vdev->tvnorms) | |
648 | set_bit(_IOC_NR(VIDIOC_ENUMSTD), valid_ioctls); | |
649 | if (ops->vidioc_g_std || vdev->current_norm) | |
650 | set_bit(_IOC_NR(VIDIOC_G_STD), valid_ioctls); | |
651 | SET_VALID_IOCTL(ops, VIDIOC_S_STD, vidioc_s_std); | |
652 | SET_VALID_IOCTL(ops, VIDIOC_QUERYSTD, vidioc_querystd); | |
653 | SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input); | |
654 | SET_VALID_IOCTL(ops, VIDIOC_G_INPUT, vidioc_g_input); | |
655 | SET_VALID_IOCTL(ops, VIDIOC_S_INPUT, vidioc_s_input); | |
656 | SET_VALID_IOCTL(ops, VIDIOC_ENUMOUTPUT, vidioc_enum_output); | |
657 | SET_VALID_IOCTL(ops, VIDIOC_G_OUTPUT, vidioc_g_output); | |
658 | SET_VALID_IOCTL(ops, VIDIOC_S_OUTPUT, vidioc_s_output); | |
659 | /* Note: the control handler can also be passed through the filehandle, | |
660 | and that can't be tested here. If the bit for these control ioctls | |
661 | is set, then the ioctl is valid. But if it is 0, then it can still | |
662 | be valid if the filehandle passed the control handler. */ | |
663 | if (vdev->ctrl_handler || ops->vidioc_queryctrl) | |
664 | set_bit(_IOC_NR(VIDIOC_QUERYCTRL), valid_ioctls); | |
665 | if (vdev->ctrl_handler || ops->vidioc_g_ctrl || ops->vidioc_g_ext_ctrls) | |
666 | set_bit(_IOC_NR(VIDIOC_G_CTRL), valid_ioctls); | |
667 | if (vdev->ctrl_handler || ops->vidioc_s_ctrl || ops->vidioc_s_ext_ctrls) | |
668 | set_bit(_IOC_NR(VIDIOC_S_CTRL), valid_ioctls); | |
669 | if (vdev->ctrl_handler || ops->vidioc_g_ext_ctrls) | |
670 | set_bit(_IOC_NR(VIDIOC_G_EXT_CTRLS), valid_ioctls); | |
671 | if (vdev->ctrl_handler || ops->vidioc_s_ext_ctrls) | |
672 | set_bit(_IOC_NR(VIDIOC_S_EXT_CTRLS), valid_ioctls); | |
673 | if (vdev->ctrl_handler || ops->vidioc_try_ext_ctrls) | |
674 | set_bit(_IOC_NR(VIDIOC_TRY_EXT_CTRLS), valid_ioctls); | |
675 | if (vdev->ctrl_handler || ops->vidioc_querymenu) | |
676 | set_bit(_IOC_NR(VIDIOC_QUERYMENU), valid_ioctls); | |
677 | SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDIO, vidioc_enumaudio); | |
678 | SET_VALID_IOCTL(ops, VIDIOC_G_AUDIO, vidioc_g_audio); | |
679 | SET_VALID_IOCTL(ops, VIDIOC_S_AUDIO, vidioc_s_audio); | |
680 | SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDOUT, vidioc_enumaudout); | |
681 | SET_VALID_IOCTL(ops, VIDIOC_G_AUDOUT, vidioc_g_audout); | |
682 | SET_VALID_IOCTL(ops, VIDIOC_S_AUDOUT, vidioc_s_audout); | |
683 | SET_VALID_IOCTL(ops, VIDIOC_G_MODULATOR, vidioc_g_modulator); | |
684 | SET_VALID_IOCTL(ops, VIDIOC_S_MODULATOR, vidioc_s_modulator); | |
685 | if (ops->vidioc_g_crop || ops->vidioc_g_selection) | |
686 | set_bit(_IOC_NR(VIDIOC_G_CROP), valid_ioctls); | |
687 | if (ops->vidioc_s_crop || ops->vidioc_s_selection) | |
688 | set_bit(_IOC_NR(VIDIOC_S_CROP), valid_ioctls); | |
689 | SET_VALID_IOCTL(ops, VIDIOC_G_SELECTION, vidioc_g_selection); | |
690 | SET_VALID_IOCTL(ops, VIDIOC_S_SELECTION, vidioc_s_selection); | |
691 | if (ops->vidioc_cropcap || ops->vidioc_g_selection) | |
692 | set_bit(_IOC_NR(VIDIOC_CROPCAP), valid_ioctls); | |
693 | SET_VALID_IOCTL(ops, VIDIOC_G_JPEGCOMP, vidioc_g_jpegcomp); | |
694 | SET_VALID_IOCTL(ops, VIDIOC_S_JPEGCOMP, vidioc_s_jpegcomp); | |
695 | SET_VALID_IOCTL(ops, VIDIOC_G_ENC_INDEX, vidioc_g_enc_index); | |
696 | SET_VALID_IOCTL(ops, VIDIOC_ENCODER_CMD, vidioc_encoder_cmd); | |
697 | SET_VALID_IOCTL(ops, VIDIOC_TRY_ENCODER_CMD, vidioc_try_encoder_cmd); | |
698 | SET_VALID_IOCTL(ops, VIDIOC_DECODER_CMD, vidioc_decoder_cmd); | |
699 | SET_VALID_IOCTL(ops, VIDIOC_TRY_DECODER_CMD, vidioc_try_decoder_cmd); | |
837c7e42 HV |
700 | if (ops->vidioc_g_parm || (vdev->vfl_type == VFL_TYPE_GRABBER && |
701 | (ops->vidioc_g_std || vdev->tvnorms))) | |
48ea0be0 HV |
702 | set_bit(_IOC_NR(VIDIOC_G_PARM), valid_ioctls); |
703 | SET_VALID_IOCTL(ops, VIDIOC_S_PARM, vidioc_s_parm); | |
704 | SET_VALID_IOCTL(ops, VIDIOC_G_TUNER, vidioc_g_tuner); | |
705 | SET_VALID_IOCTL(ops, VIDIOC_S_TUNER, vidioc_s_tuner); | |
706 | SET_VALID_IOCTL(ops, VIDIOC_G_FREQUENCY, vidioc_g_frequency); | |
707 | SET_VALID_IOCTL(ops, VIDIOC_S_FREQUENCY, vidioc_s_frequency); | |
708 | SET_VALID_IOCTL(ops, VIDIOC_G_SLICED_VBI_CAP, vidioc_g_sliced_vbi_cap); | |
709 | SET_VALID_IOCTL(ops, VIDIOC_LOG_STATUS, vidioc_log_status); | |
710 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
711 | SET_VALID_IOCTL(ops, VIDIOC_DBG_G_REGISTER, vidioc_g_register); | |
712 | SET_VALID_IOCTL(ops, VIDIOC_DBG_S_REGISTER, vidioc_s_register); | |
713 | #endif | |
714 | SET_VALID_IOCTL(ops, VIDIOC_DBG_G_CHIP_IDENT, vidioc_g_chip_ident); | |
715 | SET_VALID_IOCTL(ops, VIDIOC_S_HW_FREQ_SEEK, vidioc_s_hw_freq_seek); | |
716 | SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes); | |
717 | SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals); | |
718 | SET_VALID_IOCTL(ops, VIDIOC_ENUM_DV_PRESETS, vidioc_enum_dv_presets); | |
719 | SET_VALID_IOCTL(ops, VIDIOC_S_DV_PRESET, vidioc_s_dv_preset); | |
720 | SET_VALID_IOCTL(ops, VIDIOC_G_DV_PRESET, vidioc_g_dv_preset); | |
721 | SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_PRESET, vidioc_query_dv_preset); | |
722 | SET_VALID_IOCTL(ops, VIDIOC_S_DV_TIMINGS, vidioc_s_dv_timings); | |
723 | SET_VALID_IOCTL(ops, VIDIOC_G_DV_TIMINGS, vidioc_g_dv_timings); | |
0b5dabed HV |
724 | SET_VALID_IOCTL(ops, VIDIOC_ENUM_DV_TIMINGS, vidioc_enum_dv_timings); |
725 | SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings); | |
4c1110aa | 726 | SET_VALID_IOCTL(ops, VIDIOC_DV_TIMINGS_CAP, vidioc_dv_timings_cap); |
48ea0be0 HV |
727 | /* yes, really vidioc_subscribe_event */ |
728 | SET_VALID_IOCTL(ops, VIDIOC_DQEVENT, vidioc_subscribe_event); | |
729 | SET_VALID_IOCTL(ops, VIDIOC_SUBSCRIBE_EVENT, vidioc_subscribe_event); | |
730 | SET_VALID_IOCTL(ops, VIDIOC_UNSUBSCRIBE_EVENT, vidioc_unsubscribe_event); | |
731 | SET_VALID_IOCTL(ops, VIDIOC_CREATE_BUFS, vidioc_create_bufs); | |
732 | SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, vidioc_prepare_buf); | |
82b655bf HV |
733 | if (ops->vidioc_enum_freq_bands || ops->vidioc_g_tuner || ops->vidioc_g_modulator) |
734 | set_bit(_IOC_NR(VIDIOC_ENUM_FREQ_BANDS), valid_ioctls); | |
48ea0be0 HV |
735 | bitmap_andnot(vdev->valid_ioctls, valid_ioctls, vdev->valid_ioctls, |
736 | BASE_VIDIOC_PRIVATE); | |
737 | } | |
738 | ||
27a5e6d3 | 739 | /** |
2096a5dc | 740 | * __video_register_device - register video4linux devices |
dc93a70c | 741 | * @vdev: video device structure we want to register |
27a5e6d3 | 742 | * @type: type of device to register |
22e22125 | 743 | * @nr: which device node number (0 == /dev/video0, 1 == /dev/video1, ... |
27a5e6d3 | 744 | * -1 == first free) |
6b5270d2 HV |
745 | * @warn_if_nr_in_use: warn if the desired device node number |
746 | * was already in use and another number was chosen instead. | |
2096a5dc | 747 | * @owner: module that owns the video device node |
27a5e6d3 | 748 | * |
22e22125 HV |
749 | * The registration code assigns minor numbers and device node numbers |
750 | * based on the requested type and registers the new device node with | |
751 | * the kernel. | |
46b63377 HV |
752 | * |
753 | * This function assumes that struct video_device was zeroed when it | |
754 | * was allocated and does not contain any stale date. | |
755 | * | |
22e22125 HV |
756 | * An error is returned if no free minor or device node number could be |
757 | * found, or if the registration of the device node failed. | |
27a5e6d3 HV |
758 | * |
759 | * Zero is returned on success. | |
760 | * | |
761 | * Valid types are | |
762 | * | |
763 | * %VFL_TYPE_GRABBER - A frame grabber | |
764 | * | |
27a5e6d3 HV |
765 | * %VFL_TYPE_VBI - Vertical blank data (undecoded) |
766 | * | |
767 | * %VFL_TYPE_RADIO - A radio card | |
2096a5dc LP |
768 | * |
769 | * %VFL_TYPE_SUBDEV - A subdevice | |
27a5e6d3 | 770 | */ |
2096a5dc LP |
771 | int __video_register_device(struct video_device *vdev, int type, int nr, |
772 | int warn_if_nr_in_use, struct module *owner) | |
27a5e6d3 HV |
773 | { |
774 | int i = 0; | |
27a5e6d3 | 775 | int ret; |
dd89601d HV |
776 | int minor_offset = 0; |
777 | int minor_cnt = VIDEO_NUM_DEVICES; | |
778 | const char *name_base; | |
27a5e6d3 | 779 | |
dc93a70c HV |
780 | /* A minor value of -1 marks this video device as never |
781 | having been registered */ | |
428c8d19 | 782 | vdev->minor = -1; |
ee7aa9f8 | 783 | |
dc93a70c | 784 | /* the release callback MUST be present */ |
1fc2b5f7 | 785 | if (WARN_ON(!vdev->release)) |
f3b9f50e HK |
786 | return -EINVAL; |
787 | ||
1babcb46 SA |
788 | /* v4l2_fh support */ |
789 | spin_lock_init(&vdev->fh_lock); | |
790 | INIT_LIST_HEAD(&vdev->fh_list); | |
791 | ||
dc93a70c | 792 | /* Part 1: check device type */ |
27a5e6d3 HV |
793 | switch (type) { |
794 | case VFL_TYPE_GRABBER: | |
27a5e6d3 HV |
795 | name_base = "video"; |
796 | break; | |
27a5e6d3 | 797 | case VFL_TYPE_VBI: |
27a5e6d3 HV |
798 | name_base = "vbi"; |
799 | break; | |
800 | case VFL_TYPE_RADIO: | |
27a5e6d3 HV |
801 | name_base = "radio"; |
802 | break; | |
2096a5dc LP |
803 | case VFL_TYPE_SUBDEV: |
804 | name_base = "v4l-subdev"; | |
805 | break; | |
27a5e6d3 HV |
806 | default: |
807 | printk(KERN_ERR "%s called with unknown type: %d\n", | |
808 | __func__, type); | |
46f2c21c | 809 | return -EINVAL; |
27a5e6d3 HV |
810 | } |
811 | ||
dc93a70c HV |
812 | vdev->vfl_type = type; |
813 | vdev->cdev = NULL; | |
11bbc1ca HV |
814 | if (vdev->v4l2_dev) { |
815 | if (vdev->v4l2_dev->dev) | |
816 | vdev->parent = vdev->v4l2_dev->dev; | |
817 | if (vdev->ctrl_handler == NULL) | |
818 | vdev->ctrl_handler = vdev->v4l2_dev->ctrl_handler; | |
b1a873a3 HV |
819 | /* If the prio state pointer is NULL, then use the v4l2_device |
820 | prio state. */ | |
821 | if (vdev->prio == NULL) | |
0f62fd6a | 822 | vdev->prio = &vdev->v4l2_dev->prio; |
11bbc1ca | 823 | } |
dd89601d | 824 | |
22e22125 | 825 | /* Part 2: find a free minor, device node number and device index. */ |
dd89601d HV |
826 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES |
827 | /* Keep the ranges for the first four types for historical | |
828 | * reasons. | |
829 | * Newer devices (not yet in place) should use the range | |
830 | * of 128-191 and just pick the first free minor there | |
831 | * (new style). */ | |
832 | switch (type) { | |
833 | case VFL_TYPE_GRABBER: | |
834 | minor_offset = 0; | |
835 | minor_cnt = 64; | |
836 | break; | |
837 | case VFL_TYPE_RADIO: | |
838 | minor_offset = 64; | |
839 | minor_cnt = 64; | |
840 | break; | |
dd89601d HV |
841 | case VFL_TYPE_VBI: |
842 | minor_offset = 224; | |
843 | minor_cnt = 32; | |
844 | break; | |
845 | default: | |
846 | minor_offset = 128; | |
847 | minor_cnt = 64; | |
848 | break; | |
849 | } | |
850 | #endif | |
851 | ||
22e22125 | 852 | /* Pick a device node number */ |
27a5e6d3 | 853 | mutex_lock(&videodev_lock); |
5062cb70 | 854 | nr = devnode_find(vdev, nr == -1 ? 0 : nr, minor_cnt); |
dd89601d | 855 | if (nr == minor_cnt) |
5062cb70 | 856 | nr = devnode_find(vdev, 0, minor_cnt); |
dd89601d | 857 | if (nr == minor_cnt) { |
22e22125 | 858 | printk(KERN_ERR "could not get a free device node number\n"); |
dd89601d HV |
859 | mutex_unlock(&videodev_lock); |
860 | return -ENFILE; | |
27a5e6d3 | 861 | } |
dd89601d | 862 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES |
22e22125 | 863 | /* 1-on-1 mapping of device node number to minor number */ |
dd89601d HV |
864 | i = nr; |
865 | #else | |
22e22125 HV |
866 | /* The device node number and minor numbers are independent, so |
867 | we just find the first free minor number. */ | |
dd89601d HV |
868 | for (i = 0; i < VIDEO_NUM_DEVICES; i++) |
869 | if (video_device[i] == NULL) | |
870 | break; | |
871 | if (i == VIDEO_NUM_DEVICES) { | |
872 | mutex_unlock(&videodev_lock); | |
873 | printk(KERN_ERR "could not get a free minor\n"); | |
874 | return -ENFILE; | |
875 | } | |
876 | #endif | |
dc93a70c HV |
877 | vdev->minor = i + minor_offset; |
878 | vdev->num = nr; | |
5062cb70 HV |
879 | devnode_set(vdev); |
880 | ||
dc93a70c HV |
881 | /* Should not happen since we thought this minor was free */ |
882 | WARN_ON(video_device[vdev->minor] != NULL); | |
7ae0cd9b | 883 | vdev->index = get_index(vdev); |
27a5e6d3 | 884 | mutex_unlock(&videodev_lock); |
5126f259 HV |
885 | /* if no lock was passed, then make sure the LOCK_ALL_FOPS bit is |
886 | clear and warn if it wasn't. */ | |
887 | if (vdev->lock == NULL) | |
888 | WARN_ON(test_and_clear_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags)); | |
27a5e6d3 | 889 | |
48ea0be0 HV |
890 | if (vdev->ioctl_ops) |
891 | determine_valid_ioctls(vdev); | |
892 | ||
dc93a70c HV |
893 | /* Part 3: Initialize the character device */ |
894 | vdev->cdev = cdev_alloc(); | |
895 | if (vdev->cdev == NULL) { | |
896 | ret = -ENOMEM; | |
897 | goto cleanup; | |
898 | } | |
86a5ef7d | 899 | vdev->cdev->ops = &v4l2_fops; |
2096a5dc | 900 | vdev->cdev->owner = owner; |
dc93a70c | 901 | ret = cdev_add(vdev->cdev, MKDEV(VIDEO_MAJOR, vdev->minor), 1); |
7f8ecfab HV |
902 | if (ret < 0) { |
903 | printk(KERN_ERR "%s: cdev_add failed\n", __func__); | |
dc93a70c HV |
904 | kfree(vdev->cdev); |
905 | vdev->cdev = NULL; | |
906 | goto cleanup; | |
7f8ecfab | 907 | } |
dc93a70c HV |
908 | |
909 | /* Part 4: register the device with sysfs */ | |
dc93a70c HV |
910 | vdev->dev.class = &video_class; |
911 | vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor); | |
912 | if (vdev->parent) | |
913 | vdev->dev.parent = vdev->parent; | |
22e22125 | 914 | dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num); |
dc93a70c | 915 | ret = device_register(&vdev->dev); |
27a5e6d3 HV |
916 | if (ret < 0) { |
917 | printk(KERN_ERR "%s: device_register failed\n", __func__); | |
dc93a70c | 918 | goto cleanup; |
27a5e6d3 | 919 | } |
dc93a70c HV |
920 | /* Register the release callback that will be called when the last |
921 | reference to the device goes away. */ | |
922 | vdev->dev.release = v4l2_device_release; | |
27a5e6d3 | 923 | |
6b5270d2 | 924 | if (nr != -1 && nr != vdev->num && warn_if_nr_in_use) |
eac8ea53 LP |
925 | printk(KERN_WARNING "%s: requested %s%d, got %s\n", __func__, |
926 | name_base, nr, video_device_node_name(vdev)); | |
bedf8bcf HV |
927 | |
928 | /* Increase v4l2_device refcount */ | |
929 | if (vdev->v4l2_dev) | |
930 | v4l2_device_get(vdev->v4l2_dev); | |
931 | ||
2c0ab67b LP |
932 | #if defined(CONFIG_MEDIA_CONTROLLER) |
933 | /* Part 5: Register the entity. */ | |
c4f0b78a LP |
934 | if (vdev->v4l2_dev && vdev->v4l2_dev->mdev && |
935 | vdev->vfl_type != VFL_TYPE_SUBDEV) { | |
2c0ab67b LP |
936 | vdev->entity.type = MEDIA_ENT_T_DEVNODE_V4L; |
937 | vdev->entity.name = vdev->name; | |
fa5034c6 CL |
938 | vdev->entity.info.v4l.major = VIDEO_MAJOR; |
939 | vdev->entity.info.v4l.minor = vdev->minor; | |
2c0ab67b LP |
940 | ret = media_device_register_entity(vdev->v4l2_dev->mdev, |
941 | &vdev->entity); | |
942 | if (ret < 0) | |
943 | printk(KERN_WARNING | |
944 | "%s: media_device_register_entity failed\n", | |
945 | __func__); | |
946 | } | |
947 | #endif | |
948 | /* Part 6: Activate this minor. The char device can now be used. */ | |
957b4aa9 | 949 | set_bit(V4L2_FL_REGISTERED, &vdev->flags); |
dc93a70c HV |
950 | mutex_lock(&videodev_lock); |
951 | video_device[vdev->minor] = vdev; | |
952 | mutex_unlock(&videodev_lock); | |
2c0ab67b | 953 | |
dc93a70c | 954 | return 0; |
7f8ecfab | 955 | |
dc93a70c | 956 | cleanup: |
27a5e6d3 | 957 | mutex_lock(&videodev_lock); |
dc93a70c HV |
958 | if (vdev->cdev) |
959 | cdev_del(vdev->cdev); | |
5062cb70 | 960 | devnode_clear(vdev); |
27a5e6d3 | 961 | mutex_unlock(&videodev_lock); |
dc93a70c HV |
962 | /* Mark this video device as never having been registered. */ |
963 | vdev->minor = -1; | |
27a5e6d3 HV |
964 | return ret; |
965 | } | |
2096a5dc | 966 | EXPORT_SYMBOL(__video_register_device); |
6b5270d2 | 967 | |
27a5e6d3 HV |
968 | /** |
969 | * video_unregister_device - unregister a video4linux device | |
dc93a70c | 970 | * @vdev: the device to unregister |
27a5e6d3 | 971 | * |
dc93a70c HV |
972 | * This unregisters the passed device. Future open calls will |
973 | * be met with errors. | |
27a5e6d3 | 974 | */ |
dc93a70c | 975 | void video_unregister_device(struct video_device *vdev) |
27a5e6d3 | 976 | { |
dc93a70c | 977 | /* Check if vdev was ever registered at all */ |
957b4aa9 | 978 | if (!vdev || !video_is_registered(vdev)) |
dc93a70c HV |
979 | return; |
980 | ||
ca9afe6f HV |
981 | mutex_lock(&videodev_lock); |
982 | /* This must be in a critical section to prevent a race with v4l2_open. | |
983 | * Once this bit has been cleared video_get may never be called again. | |
984 | */ | |
957b4aa9 | 985 | clear_bit(V4L2_FL_REGISTERED, &vdev->flags); |
ca9afe6f | 986 | mutex_unlock(&videodev_lock); |
dc93a70c | 987 | device_unregister(&vdev->dev); |
27a5e6d3 HV |
988 | } |
989 | EXPORT_SYMBOL(video_unregister_device); | |
990 | ||
27a5e6d3 HV |
991 | /* |
992 | * Initialise video for linux | |
993 | */ | |
27a5e6d3 HV |
994 | static int __init videodev_init(void) |
995 | { | |
7f8ecfab | 996 | dev_t dev = MKDEV(VIDEO_MAJOR, 0); |
27a5e6d3 HV |
997 | int ret; |
998 | ||
999 | printk(KERN_INFO "Linux video capture interface: v2.00\n"); | |
7f8ecfab HV |
1000 | ret = register_chrdev_region(dev, VIDEO_NUM_DEVICES, VIDEO_NAME); |
1001 | if (ret < 0) { | |
1002 | printk(KERN_WARNING "videodev: unable to get major %d\n", | |
1003 | VIDEO_MAJOR); | |
1004 | return ret; | |
27a5e6d3 HV |
1005 | } |
1006 | ||
1007 | ret = class_register(&video_class); | |
1008 | if (ret < 0) { | |
7f8ecfab | 1009 | unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); |
27a5e6d3 HV |
1010 | printk(KERN_WARNING "video_dev: class_register failed\n"); |
1011 | return -EIO; | |
1012 | } | |
1013 | ||
1014 | return 0; | |
1015 | } | |
1016 | ||
1017 | static void __exit videodev_exit(void) | |
1018 | { | |
7f8ecfab HV |
1019 | dev_t dev = MKDEV(VIDEO_MAJOR, 0); |
1020 | ||
27a5e6d3 | 1021 | class_unregister(&video_class); |
7f8ecfab | 1022 | unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); |
27a5e6d3 HV |
1023 | } |
1024 | ||
ee981c6f | 1025 | subsys_initcall(videodev_init); |
27a5e6d3 HV |
1026 | module_exit(videodev_exit) |
1027 | ||
1028 | MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@infradead.org>"); | |
1029 | MODULE_DESCRIPTION("Device registrar for Video4Linux drivers v2"); | |
1030 | MODULE_LICENSE("GPL"); | |
cbb72b0f | 1031 | MODULE_ALIAS_CHARDEV_MAJOR(VIDEO_MAJOR); |
27a5e6d3 HV |
1032 | |
1033 | ||
1034 | /* | |
1035 | * Local variables: | |
1036 | * c-basic-offset: 8 | |
1037 | * End: | |
1038 | */ |