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 | { | |
496ad9aa | 225 | return video_device[iminor(file_inode(file))]; |
27a5e6d3 HV |
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; | |
ee6869af HV |
301 | if (video_is_registered(vdev)) |
302 | ret = vdev->fops->read(filp, buf, sz, off); | |
cc4b7e7f HV |
303 | if (vdev->debug) |
304 | printk(KERN_DEBUG "%s: read: %zd (%d)\n", | |
305 | video_device_node_name(vdev), sz, ret); | |
ee6869af | 306 | return ret; |
dc93a70c HV |
307 | } |
308 | ||
309 | static ssize_t v4l2_write(struct file *filp, const char __user *buf, | |
310 | size_t sz, loff_t *off) | |
311 | { | |
312 | struct video_device *vdev = video_devdata(filp); | |
2877842d | 313 | int ret = -ENODEV; |
dc93a70c HV |
314 | |
315 | if (!vdev->fops->write) | |
316 | return -EINVAL; | |
ee6869af HV |
317 | if (video_is_registered(vdev)) |
318 | ret = vdev->fops->write(filp, buf, sz, off); | |
cc4b7e7f HV |
319 | if (vdev->debug) |
320 | printk(KERN_DEBUG "%s: write: %zd (%d)\n", | |
321 | video_device_node_name(vdev), sz, ret); | |
ee6869af | 322 | return ret; |
dc93a70c HV |
323 | } |
324 | ||
325 | static unsigned int v4l2_poll(struct file *filp, struct poll_table_struct *poll) | |
326 | { | |
327 | struct video_device *vdev = video_devdata(filp); | |
cf533735 | 328 | unsigned int res = POLLERR | POLLHUP; |
ee6869af HV |
329 | |
330 | if (!vdev->fops->poll) | |
2877842d | 331 | return DEFAULT_POLLMASK; |
ee6869af | 332 | if (video_is_registered(vdev)) |
cf533735 | 333 | res = vdev->fops->poll(filp, poll); |
cc4b7e7f HV |
334 | if (vdev->debug) |
335 | printk(KERN_DEBUG "%s: poll: %08x\n", | |
cf533735 HV |
336 | video_device_node_name(vdev), res); |
337 | return res; | |
dc93a70c HV |
338 | } |
339 | ||
86a5ef7d | 340 | static long v4l2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
dc93a70c HV |
341 | { |
342 | struct video_device *vdev = video_devdata(filp); | |
72420630 | 343 | int ret = -ENODEV; |
dc93a70c | 344 | |
86a5ef7d | 345 | if (vdev->fops->unlocked_ioctl) { |
5a5adf6b | 346 | struct mutex *lock = v4l2_ioctl_get_lock(vdev, cmd); |
8ab75e3e | 347 | |
5a5adf6b HV |
348 | if (lock && mutex_lock_interruptible(lock)) |
349 | return -ERESTARTSYS; | |
72420630 MCC |
350 | if (video_is_registered(vdev)) |
351 | ret = vdev->fops->unlocked_ioctl(filp, cmd, arg); | |
5a5adf6b HV |
352 | if (lock) |
353 | mutex_unlock(lock); | |
86a5ef7d | 354 | } else if (vdev->fops->ioctl) { |
879aa24d HV |
355 | /* This code path is a replacement for the BKL. It is a major |
356 | * hack but it will have to do for those drivers that are not | |
357 | * yet converted to use unlocked_ioctl. | |
358 | * | |
359 | * There are two options: if the driver implements struct | |
360 | * v4l2_device, then the lock defined there is used to | |
361 | * serialize the ioctls. Otherwise the v4l2 core lock defined | |
362 | * below is used. This lock is really bad since it serializes | |
363 | * completely independent devices. | |
364 | * | |
365 | * Both variants suffer from the same problem: if the driver | |
366 | * sleeps, then it blocks all ioctls since the lock is still | |
367 | * held. This is very common for VIDIOC_DQBUF since that | |
368 | * normally waits for a frame to arrive. As a result any other | |
369 | * ioctl calls will proceed very, very slowly since each call | |
370 | * will have to wait for the VIDIOC_QBUF to finish. Things that | |
371 | * should take 0.01s may now take 10-20 seconds. | |
372 | * | |
373 | * The workaround is to *not* take the lock for VIDIOC_DQBUF. | |
374 | * This actually works OK for videobuf-based drivers, since | |
375 | * videobuf will take its own internal lock. | |
376 | */ | |
0edf2e5e | 377 | static DEFINE_MUTEX(v4l2_ioctl_mutex); |
879aa24d HV |
378 | struct mutex *m = vdev->v4l2_dev ? |
379 | &vdev->v4l2_dev->ioctl_lock : &v4l2_ioctl_mutex; | |
0edf2e5e | 380 | |
879aa24d HV |
381 | if (cmd != VIDIOC_DQBUF && mutex_lock_interruptible(m)) |
382 | return -ERESTARTSYS; | |
72420630 MCC |
383 | if (video_is_registered(vdev)) |
384 | ret = vdev->fops->ioctl(filp, cmd, arg); | |
879aa24d HV |
385 | if (cmd != VIDIOC_DQBUF) |
386 | mutex_unlock(m); | |
86a5ef7d AB |
387 | } else |
388 | ret = -ENOTTY; | |
dc93a70c | 389 | |
86a5ef7d | 390 | return ret; |
dc93a70c HV |
391 | } |
392 | ||
ecc6517d BL |
393 | #ifdef CONFIG_MMU |
394 | #define v4l2_get_unmapped_area NULL | |
395 | #else | |
396 | static unsigned long v4l2_get_unmapped_area(struct file *filp, | |
397 | unsigned long addr, unsigned long len, unsigned long pgoff, | |
398 | unsigned long flags) | |
399 | { | |
400 | struct video_device *vdev = video_devdata(filp); | |
cc4b7e7f | 401 | int ret; |
ecc6517d BL |
402 | |
403 | if (!vdev->fops->get_unmapped_area) | |
404 | return -ENOSYS; | |
405 | if (!video_is_registered(vdev)) | |
406 | return -ENODEV; | |
cc4b7e7f HV |
407 | ret = vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags); |
408 | if (vdev->debug) | |
409 | printk(KERN_DEBUG "%s: get_unmapped_area (%d)\n", | |
410 | video_device_node_name(vdev), ret); | |
411 | return ret; | |
ecc6517d BL |
412 | } |
413 | #endif | |
414 | ||
dc93a70c HV |
415 | static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm) |
416 | { | |
417 | struct video_device *vdev = video_devdata(filp); | |
ee6869af HV |
418 | int ret = -ENODEV; |
419 | ||
420 | if (!vdev->fops->mmap) | |
cf533735 | 421 | return -ENODEV; |
ee6869af HV |
422 | if (video_is_registered(vdev)) |
423 | ret = vdev->fops->mmap(filp, vm); | |
cc4b7e7f HV |
424 | if (vdev->debug) |
425 | printk(KERN_DEBUG "%s: mmap (%d)\n", | |
426 | video_device_node_name(vdev), ret); | |
ee6869af | 427 | return ret; |
dc93a70c HV |
428 | } |
429 | ||
430 | /* Override for the open function */ | |
431 | static int v4l2_open(struct inode *inode, struct file *filp) | |
432 | { | |
433 | struct video_device *vdev; | |
65d9ff9c | 434 | int ret = 0; |
dc93a70c HV |
435 | |
436 | /* Check if the video device is available */ | |
437 | mutex_lock(&videodev_lock); | |
438 | vdev = video_devdata(filp); | |
ee6869af | 439 | /* return ENODEV if the video device has already been removed. */ |
ca9afe6f | 440 | if (vdev == NULL || !video_is_registered(vdev)) { |
dc93a70c HV |
441 | mutex_unlock(&videodev_lock); |
442 | return -ENODEV; | |
443 | } | |
444 | /* and increase the device refcount */ | |
445 | video_get(vdev); | |
446 | mutex_unlock(&videodev_lock); | |
ee6869af | 447 | if (vdev->fops->open) { |
ee6869af HV |
448 | if (video_is_registered(vdev)) |
449 | ret = vdev->fops->open(filp); | |
450 | else | |
451 | ret = -ENODEV; | |
ee6869af | 452 | } |
65d9ff9c | 453 | |
cc4b7e7f HV |
454 | if (vdev->debug) |
455 | printk(KERN_DEBUG "%s: open (%d)\n", | |
456 | video_device_node_name(vdev), ret); | |
8f695d3f EG |
457 | /* decrease the refcount in case of an error */ |
458 | if (ret) | |
459 | video_put(vdev); | |
dc93a70c HV |
460 | return ret; |
461 | } | |
462 | ||
463 | /* Override for the release function */ | |
464 | static int v4l2_release(struct inode *inode, struct file *filp) | |
465 | { | |
466 | struct video_device *vdev = video_devdata(filp); | |
65d9ff9c HV |
467 | int ret = 0; |
468 | ||
cf533735 HV |
469 | if (vdev->fops->release) |
470 | ret = vdev->fops->release(filp); | |
cc4b7e7f HV |
471 | if (vdev->debug) |
472 | printk(KERN_DEBUG "%s: release\n", | |
473 | video_device_node_name(vdev)); | |
cf533735 | 474 | |
8f695d3f EG |
475 | /* decrease the refcount unconditionally since the release() |
476 | return value is ignored. */ | |
477 | video_put(vdev); | |
dc93a70c HV |
478 | return ret; |
479 | } | |
480 | ||
dc93a70c HV |
481 | static const struct file_operations v4l2_fops = { |
482 | .owner = THIS_MODULE, | |
483 | .read = v4l2_read, | |
484 | .write = v4l2_write, | |
485 | .open = v4l2_open, | |
ecc6517d | 486 | .get_unmapped_area = v4l2_get_unmapped_area, |
dc93a70c | 487 | .mmap = v4l2_mmap, |
86a5ef7d | 488 | .unlocked_ioctl = v4l2_ioctl, |
dc93a70c | 489 | #ifdef CONFIG_COMPAT |
9bb7cde7 | 490 | .compat_ioctl = v4l2_compat_ioctl32, |
dc93a70c HV |
491 | #endif |
492 | .release = v4l2_release, | |
493 | .poll = v4l2_poll, | |
494 | .llseek = no_llseek, | |
495 | }; | |
496 | ||
27a5e6d3 | 497 | /** |
1c1d86a1 HV |
498 | * get_index - assign stream index number based on v4l2_dev |
499 | * @vdev: video_device to assign index number to, vdev->v4l2_dev should be assigned | |
27a5e6d3 | 500 | * |
dc93a70c | 501 | * Note that when this is called the new device has not yet been registered |
7ae0cd9b | 502 | * in the video_device array, but it was able to obtain a minor number. |
27a5e6d3 | 503 | * |
7ae0cd9b HV |
504 | * This means that we can always obtain a free stream index number since |
505 | * the worst case scenario is that there are VIDEO_NUM_DEVICES - 1 slots in | |
506 | * use of the video_device array. | |
507 | * | |
508 | * Returns a free index number. | |
27a5e6d3 | 509 | */ |
7ae0cd9b | 510 | static int get_index(struct video_device *vdev) |
27a5e6d3 | 511 | { |
775a05dd HV |
512 | /* This can be static since this function is called with the global |
513 | videodev_lock held. */ | |
514 | static DECLARE_BITMAP(used, VIDEO_NUM_DEVICES); | |
27a5e6d3 HV |
515 | int i; |
516 | ||
775a05dd | 517 | bitmap_zero(used, VIDEO_NUM_DEVICES); |
806e5b7c | 518 | |
27a5e6d3 HV |
519 | for (i = 0; i < VIDEO_NUM_DEVICES; i++) { |
520 | if (video_device[i] != NULL && | |
1c1d86a1 | 521 | video_device[i]->v4l2_dev == vdev->v4l2_dev) { |
775a05dd | 522 | set_bit(video_device[i]->index, used); |
27a5e6d3 HV |
523 | } |
524 | } | |
525 | ||
7ae0cd9b | 526 | return find_first_zero_bit(used, VIDEO_NUM_DEVICES); |
27a5e6d3 HV |
527 | } |
528 | ||
48ea0be0 HV |
529 | #define SET_VALID_IOCTL(ops, cmd, op) \ |
530 | if (ops->op) \ | |
531 | set_bit(_IOC_NR(cmd), valid_ioctls) | |
532 | ||
533 | /* This determines which ioctls are actually implemented in the driver. | |
534 | It's a one-time thing which simplifies video_ioctl2 as it can just do | |
535 | a bit test. | |
536 | ||
537 | Note that drivers can override this by setting bits to 1 in | |
538 | vdev->valid_ioctls. If an ioctl is marked as 1 when this function is | |
539 | called, then that ioctl will actually be marked as unimplemented. | |
540 | ||
541 | It does that by first setting up the local valid_ioctls bitmap, and | |
542 | at the end do a: | |
543 | ||
544 | vdev->valid_ioctls = valid_ioctls & ~(vdev->valid_ioctls) | |
545 | */ | |
546 | static void determine_valid_ioctls(struct video_device *vdev) | |
547 | { | |
548 | DECLARE_BITMAP(valid_ioctls, BASE_VIDIOC_PRIVATE); | |
549 | const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops; | |
4b20259f HV |
550 | bool is_vid = vdev->vfl_type == VFL_TYPE_GRABBER; |
551 | bool is_vbi = vdev->vfl_type == VFL_TYPE_VBI; | |
552 | bool is_radio = vdev->vfl_type == VFL_TYPE_RADIO; | |
553 | bool is_rx = vdev->vfl_dir != VFL_DIR_TX; | |
554 | bool is_tx = vdev->vfl_dir != VFL_DIR_RX; | |
48ea0be0 HV |
555 | |
556 | bitmap_zero(valid_ioctls, BASE_VIDIOC_PRIVATE); | |
557 | ||
90d0fc49 HV |
558 | /* vfl_type and vfl_dir independent ioctls */ |
559 | ||
48ea0be0 HV |
560 | SET_VALID_IOCTL(ops, VIDIOC_QUERYCAP, vidioc_querycap); |
561 | if (ops->vidioc_g_priority || | |
562 | test_bit(V4L2_FL_USE_FH_PRIO, &vdev->flags)) | |
563 | set_bit(_IOC_NR(VIDIOC_G_PRIORITY), valid_ioctls); | |
564 | if (ops->vidioc_s_priority || | |
565 | test_bit(V4L2_FL_USE_FH_PRIO, &vdev->flags)) | |
566 | set_bit(_IOC_NR(VIDIOC_S_PRIORITY), valid_ioctls); | |
90d0fc49 HV |
567 | SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon); |
568 | SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff); | |
569 | /* Note: the control handler can also be passed through the filehandle, | |
570 | and that can't be tested here. If the bit for these control ioctls | |
571 | is set, then the ioctl is valid. But if it is 0, then it can still | |
572 | be valid if the filehandle passed the control handler. */ | |
573 | if (vdev->ctrl_handler || ops->vidioc_queryctrl) | |
574 | set_bit(_IOC_NR(VIDIOC_QUERYCTRL), valid_ioctls); | |
575 | if (vdev->ctrl_handler || ops->vidioc_g_ctrl || ops->vidioc_g_ext_ctrls) | |
576 | set_bit(_IOC_NR(VIDIOC_G_CTRL), valid_ioctls); | |
577 | if (vdev->ctrl_handler || ops->vidioc_s_ctrl || ops->vidioc_s_ext_ctrls) | |
578 | set_bit(_IOC_NR(VIDIOC_S_CTRL), valid_ioctls); | |
579 | if (vdev->ctrl_handler || ops->vidioc_g_ext_ctrls) | |
580 | set_bit(_IOC_NR(VIDIOC_G_EXT_CTRLS), valid_ioctls); | |
581 | if (vdev->ctrl_handler || ops->vidioc_s_ext_ctrls) | |
582 | set_bit(_IOC_NR(VIDIOC_S_EXT_CTRLS), valid_ioctls); | |
583 | if (vdev->ctrl_handler || ops->vidioc_try_ext_ctrls) | |
584 | set_bit(_IOC_NR(VIDIOC_TRY_EXT_CTRLS), valid_ioctls); | |
585 | if (vdev->ctrl_handler || ops->vidioc_querymenu) | |
586 | set_bit(_IOC_NR(VIDIOC_QUERYMENU), valid_ioctls); | |
587 | SET_VALID_IOCTL(ops, VIDIOC_G_FREQUENCY, vidioc_g_frequency); | |
588 | SET_VALID_IOCTL(ops, VIDIOC_S_FREQUENCY, vidioc_s_frequency); | |
589 | SET_VALID_IOCTL(ops, VIDIOC_LOG_STATUS, vidioc_log_status); | |
590 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
96b03d2a | 591 | set_bit(_IOC_NR(VIDIOC_DBG_G_CHIP_INFO), valid_ioctls); |
79b0c640 HV |
592 | set_bit(_IOC_NR(VIDIOC_DBG_G_REGISTER), valid_ioctls); |
593 | set_bit(_IOC_NR(VIDIOC_DBG_S_REGISTER), valid_ioctls); | |
90d0fc49 | 594 | #endif |
90d0fc49 HV |
595 | /* yes, really vidioc_subscribe_event */ |
596 | SET_VALID_IOCTL(ops, VIDIOC_DQEVENT, vidioc_subscribe_event); | |
597 | SET_VALID_IOCTL(ops, VIDIOC_SUBSCRIBE_EVENT, vidioc_subscribe_event); | |
598 | SET_VALID_IOCTL(ops, VIDIOC_UNSUBSCRIBE_EVENT, vidioc_unsubscribe_event); | |
90d0fc49 HV |
599 | if (ops->vidioc_enum_freq_bands || ops->vidioc_g_tuner || ops->vidioc_g_modulator) |
600 | set_bit(_IOC_NR(VIDIOC_ENUM_FREQ_BANDS), valid_ioctls); | |
601 | ||
4b20259f | 602 | if (is_vid) { |
90d0fc49 | 603 | /* video specific ioctls */ |
4b20259f HV |
604 | if ((is_rx && (ops->vidioc_enum_fmt_vid_cap || |
605 | ops->vidioc_enum_fmt_vid_cap_mplane || | |
606 | ops->vidioc_enum_fmt_vid_overlay)) || | |
607 | (is_tx && (ops->vidioc_enum_fmt_vid_out || | |
608 | ops->vidioc_enum_fmt_vid_out_mplane))) | |
609 | set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls); | |
610 | if ((is_rx && (ops->vidioc_g_fmt_vid_cap || | |
611 | ops->vidioc_g_fmt_vid_cap_mplane || | |
612 | ops->vidioc_g_fmt_vid_overlay)) || | |
613 | (is_tx && (ops->vidioc_g_fmt_vid_out || | |
614 | ops->vidioc_g_fmt_vid_out_mplane || | |
615 | ops->vidioc_g_fmt_vid_out_overlay))) | |
616 | set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); | |
617 | if ((is_rx && (ops->vidioc_s_fmt_vid_cap || | |
618 | ops->vidioc_s_fmt_vid_cap_mplane || | |
619 | ops->vidioc_s_fmt_vid_overlay)) || | |
620 | (is_tx && (ops->vidioc_s_fmt_vid_out || | |
621 | ops->vidioc_s_fmt_vid_out_mplane || | |
622 | ops->vidioc_s_fmt_vid_out_overlay))) | |
623 | set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); | |
624 | if ((is_rx && (ops->vidioc_try_fmt_vid_cap || | |
625 | ops->vidioc_try_fmt_vid_cap_mplane || | |
626 | ops->vidioc_try_fmt_vid_overlay)) || | |
627 | (is_tx && (ops->vidioc_try_fmt_vid_out || | |
628 | ops->vidioc_try_fmt_vid_out_mplane || | |
629 | ops->vidioc_try_fmt_vid_out_overlay))) | |
630 | set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); | |
90d0fc49 HV |
631 | SET_VALID_IOCTL(ops, VIDIOC_OVERLAY, vidioc_overlay); |
632 | SET_VALID_IOCTL(ops, VIDIOC_G_FBUF, vidioc_g_fbuf); | |
633 | SET_VALID_IOCTL(ops, VIDIOC_S_FBUF, vidioc_s_fbuf); | |
634 | SET_VALID_IOCTL(ops, VIDIOC_G_JPEGCOMP, vidioc_g_jpegcomp); | |
635 | SET_VALID_IOCTL(ops, VIDIOC_S_JPEGCOMP, vidioc_s_jpegcomp); | |
636 | SET_VALID_IOCTL(ops, VIDIOC_G_ENC_INDEX, vidioc_g_enc_index); | |
637 | SET_VALID_IOCTL(ops, VIDIOC_ENCODER_CMD, vidioc_encoder_cmd); | |
638 | SET_VALID_IOCTL(ops, VIDIOC_TRY_ENCODER_CMD, vidioc_try_encoder_cmd); | |
639 | SET_VALID_IOCTL(ops, VIDIOC_DECODER_CMD, vidioc_decoder_cmd); | |
640 | SET_VALID_IOCTL(ops, VIDIOC_TRY_DECODER_CMD, vidioc_try_decoder_cmd); | |
641 | SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes); | |
642 | SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals); | |
4b20259f | 643 | } else if (is_vbi) { |
90d0fc49 | 644 | /* vbi specific ioctls */ |
4b20259f HV |
645 | if ((is_rx && (ops->vidioc_g_fmt_vbi_cap || |
646 | ops->vidioc_g_fmt_sliced_vbi_cap)) || | |
647 | (is_tx && (ops->vidioc_g_fmt_vbi_out || | |
648 | ops->vidioc_g_fmt_sliced_vbi_out))) | |
649 | set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); | |
650 | if ((is_rx && (ops->vidioc_s_fmt_vbi_cap || | |
651 | ops->vidioc_s_fmt_sliced_vbi_cap)) || | |
652 | (is_tx && (ops->vidioc_s_fmt_vbi_out || | |
653 | ops->vidioc_s_fmt_sliced_vbi_out))) | |
654 | set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); | |
655 | if ((is_rx && (ops->vidioc_try_fmt_vbi_cap || | |
656 | ops->vidioc_try_fmt_sliced_vbi_cap)) || | |
657 | (is_tx && (ops->vidioc_try_fmt_vbi_out || | |
658 | ops->vidioc_try_fmt_sliced_vbi_out))) | |
659 | set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); | |
90d0fc49 | 660 | SET_VALID_IOCTL(ops, VIDIOC_G_SLICED_VBI_CAP, vidioc_g_sliced_vbi_cap); |
4b20259f | 661 | } |
4b20259f | 662 | if (!is_radio) { |
90d0fc49 | 663 | /* ioctls valid for video or vbi */ |
5815d0c4 FS |
664 | SET_VALID_IOCTL(ops, VIDIOC_REQBUFS, vidioc_reqbufs); |
665 | SET_VALID_IOCTL(ops, VIDIOC_QUERYBUF, vidioc_querybuf); | |
666 | SET_VALID_IOCTL(ops, VIDIOC_QBUF, vidioc_qbuf); | |
667 | SET_VALID_IOCTL(ops, VIDIOC_EXPBUF, vidioc_expbuf); | |
668 | SET_VALID_IOCTL(ops, VIDIOC_DQBUF, vidioc_dqbuf); | |
669 | SET_VALID_IOCTL(ops, VIDIOC_CREATE_BUFS, vidioc_create_bufs); | |
670 | SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, vidioc_prepare_buf); | |
4b20259f HV |
671 | if (ops->vidioc_s_std) |
672 | set_bit(_IOC_NR(VIDIOC_ENUMSTD), valid_ioctls); | |
4b20259f | 673 | SET_VALID_IOCTL(ops, VIDIOC_S_STD, vidioc_s_std); |
ca371575 | 674 | SET_VALID_IOCTL(ops, VIDIOC_G_STD, vidioc_g_std); |
4b20259f | 675 | if (is_rx) { |
90d0fc49 | 676 | SET_VALID_IOCTL(ops, VIDIOC_QUERYSTD, vidioc_querystd); |
4b20259f HV |
677 | SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input); |
678 | SET_VALID_IOCTL(ops, VIDIOC_G_INPUT, vidioc_g_input); | |
679 | SET_VALID_IOCTL(ops, VIDIOC_S_INPUT, vidioc_s_input); | |
680 | SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDIO, vidioc_enumaudio); | |
681 | SET_VALID_IOCTL(ops, VIDIOC_G_AUDIO, vidioc_g_audio); | |
682 | SET_VALID_IOCTL(ops, VIDIOC_S_AUDIO, vidioc_s_audio); | |
90d0fc49 | 683 | SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings); |
4b20259f HV |
684 | } |
685 | if (is_tx) { | |
686 | SET_VALID_IOCTL(ops, VIDIOC_ENUMOUTPUT, vidioc_enum_output); | |
687 | SET_VALID_IOCTL(ops, VIDIOC_G_OUTPUT, vidioc_g_output); | |
688 | SET_VALID_IOCTL(ops, VIDIOC_S_OUTPUT, vidioc_s_output); | |
689 | SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDOUT, vidioc_enumaudout); | |
690 | SET_VALID_IOCTL(ops, VIDIOC_G_AUDOUT, vidioc_g_audout); | |
691 | SET_VALID_IOCTL(ops, VIDIOC_S_AUDOUT, vidioc_s_audout); | |
692 | } | |
4b20259f HV |
693 | if (ops->vidioc_g_crop || ops->vidioc_g_selection) |
694 | set_bit(_IOC_NR(VIDIOC_G_CROP), valid_ioctls); | |
695 | if (ops->vidioc_s_crop || ops->vidioc_s_selection) | |
696 | set_bit(_IOC_NR(VIDIOC_S_CROP), valid_ioctls); | |
697 | SET_VALID_IOCTL(ops, VIDIOC_G_SELECTION, vidioc_g_selection); | |
698 | SET_VALID_IOCTL(ops, VIDIOC_S_SELECTION, vidioc_s_selection); | |
699 | if (ops->vidioc_cropcap || ops->vidioc_g_selection) | |
700 | set_bit(_IOC_NR(VIDIOC_CROPCAP), valid_ioctls); | |
4b20259f | 701 | if (ops->vidioc_g_parm || (vdev->vfl_type == VFL_TYPE_GRABBER && |
ca371575 | 702 | ops->vidioc_g_std)) |
4b20259f HV |
703 | set_bit(_IOC_NR(VIDIOC_G_PARM), valid_ioctls); |
704 | SET_VALID_IOCTL(ops, VIDIOC_S_PARM, vidioc_s_parm); | |
4b20259f HV |
705 | SET_VALID_IOCTL(ops, VIDIOC_S_DV_TIMINGS, vidioc_s_dv_timings); |
706 | SET_VALID_IOCTL(ops, VIDIOC_G_DV_TIMINGS, vidioc_g_dv_timings); | |
707 | SET_VALID_IOCTL(ops, VIDIOC_ENUM_DV_TIMINGS, vidioc_enum_dv_timings); | |
4b20259f HV |
708 | SET_VALID_IOCTL(ops, VIDIOC_DV_TIMINGS_CAP, vidioc_dv_timings_cap); |
709 | } | |
90d0fc49 HV |
710 | if (is_tx) { |
711 | /* transmitter only ioctls */ | |
712 | SET_VALID_IOCTL(ops, VIDIOC_G_MODULATOR, vidioc_g_modulator); | |
713 | SET_VALID_IOCTL(ops, VIDIOC_S_MODULATOR, vidioc_s_modulator); | |
714 | } | |
715 | if (is_rx) { | |
716 | /* receiver only ioctls */ | |
717 | SET_VALID_IOCTL(ops, VIDIOC_G_TUNER, vidioc_g_tuner); | |
718 | SET_VALID_IOCTL(ops, VIDIOC_S_TUNER, vidioc_s_tuner); | |
719 | SET_VALID_IOCTL(ops, VIDIOC_S_HW_FREQ_SEEK, vidioc_s_hw_freq_seek); | |
720 | } | |
721 | ||
48ea0be0 HV |
722 | bitmap_andnot(vdev->valid_ioctls, valid_ioctls, vdev->valid_ioctls, |
723 | BASE_VIDIOC_PRIVATE); | |
724 | } | |
725 | ||
27a5e6d3 | 726 | /** |
2096a5dc | 727 | * __video_register_device - register video4linux devices |
dc93a70c | 728 | * @vdev: video device structure we want to register |
27a5e6d3 | 729 | * @type: type of device to register |
22e22125 | 730 | * @nr: which device node number (0 == /dev/video0, 1 == /dev/video1, ... |
27a5e6d3 | 731 | * -1 == first free) |
6b5270d2 HV |
732 | * @warn_if_nr_in_use: warn if the desired device node number |
733 | * was already in use and another number was chosen instead. | |
2096a5dc | 734 | * @owner: module that owns the video device node |
27a5e6d3 | 735 | * |
22e22125 HV |
736 | * The registration code assigns minor numbers and device node numbers |
737 | * based on the requested type and registers the new device node with | |
738 | * the kernel. | |
46b63377 HV |
739 | * |
740 | * This function assumes that struct video_device was zeroed when it | |
741 | * was allocated and does not contain any stale date. | |
742 | * | |
22e22125 HV |
743 | * An error is returned if no free minor or device node number could be |
744 | * found, or if the registration of the device node failed. | |
27a5e6d3 HV |
745 | * |
746 | * Zero is returned on success. | |
747 | * | |
748 | * Valid types are | |
749 | * | |
750 | * %VFL_TYPE_GRABBER - A frame grabber | |
751 | * | |
27a5e6d3 HV |
752 | * %VFL_TYPE_VBI - Vertical blank data (undecoded) |
753 | * | |
754 | * %VFL_TYPE_RADIO - A radio card | |
2096a5dc LP |
755 | * |
756 | * %VFL_TYPE_SUBDEV - A subdevice | |
27a5e6d3 | 757 | */ |
2096a5dc LP |
758 | int __video_register_device(struct video_device *vdev, int type, int nr, |
759 | int warn_if_nr_in_use, struct module *owner) | |
27a5e6d3 HV |
760 | { |
761 | int i = 0; | |
27a5e6d3 | 762 | int ret; |
dd89601d HV |
763 | int minor_offset = 0; |
764 | int minor_cnt = VIDEO_NUM_DEVICES; | |
765 | const char *name_base; | |
27a5e6d3 | 766 | |
dc93a70c HV |
767 | /* A minor value of -1 marks this video device as never |
768 | having been registered */ | |
428c8d19 | 769 | vdev->minor = -1; |
ee7aa9f8 | 770 | |
dc93a70c | 771 | /* the release callback MUST be present */ |
1fc2b5f7 | 772 | if (WARN_ON(!vdev->release)) |
f3b9f50e | 773 | return -EINVAL; |
1c1d86a1 HV |
774 | /* the v4l2_dev pointer MUST be present */ |
775 | if (WARN_ON(!vdev->v4l2_dev)) | |
776 | return -EINVAL; | |
f3b9f50e | 777 | |
1babcb46 SA |
778 | /* v4l2_fh support */ |
779 | spin_lock_init(&vdev->fh_lock); | |
780 | INIT_LIST_HEAD(&vdev->fh_list); | |
781 | ||
dc93a70c | 782 | /* Part 1: check device type */ |
27a5e6d3 HV |
783 | switch (type) { |
784 | case VFL_TYPE_GRABBER: | |
27a5e6d3 HV |
785 | name_base = "video"; |
786 | break; | |
27a5e6d3 | 787 | case VFL_TYPE_VBI: |
27a5e6d3 HV |
788 | name_base = "vbi"; |
789 | break; | |
790 | case VFL_TYPE_RADIO: | |
27a5e6d3 HV |
791 | name_base = "radio"; |
792 | break; | |
2096a5dc LP |
793 | case VFL_TYPE_SUBDEV: |
794 | name_base = "v4l-subdev"; | |
795 | break; | |
27a5e6d3 HV |
796 | default: |
797 | printk(KERN_ERR "%s called with unknown type: %d\n", | |
798 | __func__, type); | |
46f2c21c | 799 | return -EINVAL; |
27a5e6d3 HV |
800 | } |
801 | ||
dc93a70c HV |
802 | vdev->vfl_type = type; |
803 | vdev->cdev = NULL; | |
1c1d86a1 HV |
804 | if (vdev->dev_parent == NULL) |
805 | vdev->dev_parent = vdev->v4l2_dev->dev; | |
806 | if (vdev->ctrl_handler == NULL) | |
807 | vdev->ctrl_handler = vdev->v4l2_dev->ctrl_handler; | |
808 | /* If the prio state pointer is NULL, then use the v4l2_device | |
809 | prio state. */ | |
810 | if (vdev->prio == NULL) | |
811 | vdev->prio = &vdev->v4l2_dev->prio; | |
dd89601d | 812 | |
22e22125 | 813 | /* Part 2: find a free minor, device node number and device index. */ |
dd89601d HV |
814 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES |
815 | /* Keep the ranges for the first four types for historical | |
816 | * reasons. | |
817 | * Newer devices (not yet in place) should use the range | |
818 | * of 128-191 and just pick the first free minor there | |
819 | * (new style). */ | |
820 | switch (type) { | |
821 | case VFL_TYPE_GRABBER: | |
822 | minor_offset = 0; | |
823 | minor_cnt = 64; | |
824 | break; | |
825 | case VFL_TYPE_RADIO: | |
826 | minor_offset = 64; | |
827 | minor_cnt = 64; | |
828 | break; | |
dd89601d HV |
829 | case VFL_TYPE_VBI: |
830 | minor_offset = 224; | |
831 | minor_cnt = 32; | |
832 | break; | |
833 | default: | |
834 | minor_offset = 128; | |
835 | minor_cnt = 64; | |
836 | break; | |
837 | } | |
838 | #endif | |
839 | ||
22e22125 | 840 | /* Pick a device node number */ |
27a5e6d3 | 841 | mutex_lock(&videodev_lock); |
5062cb70 | 842 | nr = devnode_find(vdev, nr == -1 ? 0 : nr, minor_cnt); |
dd89601d | 843 | if (nr == minor_cnt) |
5062cb70 | 844 | nr = devnode_find(vdev, 0, minor_cnt); |
dd89601d | 845 | if (nr == minor_cnt) { |
22e22125 | 846 | printk(KERN_ERR "could not get a free device node number\n"); |
dd89601d HV |
847 | mutex_unlock(&videodev_lock); |
848 | return -ENFILE; | |
27a5e6d3 | 849 | } |
dd89601d | 850 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES |
22e22125 | 851 | /* 1-on-1 mapping of device node number to minor number */ |
dd89601d HV |
852 | i = nr; |
853 | #else | |
22e22125 HV |
854 | /* The device node number and minor numbers are independent, so |
855 | we just find the first free minor number. */ | |
dd89601d HV |
856 | for (i = 0; i < VIDEO_NUM_DEVICES; i++) |
857 | if (video_device[i] == NULL) | |
858 | break; | |
859 | if (i == VIDEO_NUM_DEVICES) { | |
860 | mutex_unlock(&videodev_lock); | |
861 | printk(KERN_ERR "could not get a free minor\n"); | |
862 | return -ENFILE; | |
863 | } | |
864 | #endif | |
dc93a70c HV |
865 | vdev->minor = i + minor_offset; |
866 | vdev->num = nr; | |
5062cb70 HV |
867 | devnode_set(vdev); |
868 | ||
dc93a70c HV |
869 | /* Should not happen since we thought this minor was free */ |
870 | WARN_ON(video_device[vdev->minor] != NULL); | |
7ae0cd9b | 871 | vdev->index = get_index(vdev); |
27a5e6d3 HV |
872 | mutex_unlock(&videodev_lock); |
873 | ||
48ea0be0 HV |
874 | if (vdev->ioctl_ops) |
875 | determine_valid_ioctls(vdev); | |
876 | ||
dc93a70c HV |
877 | /* Part 3: Initialize the character device */ |
878 | vdev->cdev = cdev_alloc(); | |
879 | if (vdev->cdev == NULL) { | |
880 | ret = -ENOMEM; | |
881 | goto cleanup; | |
882 | } | |
86a5ef7d | 883 | vdev->cdev->ops = &v4l2_fops; |
2096a5dc | 884 | vdev->cdev->owner = owner; |
dc93a70c | 885 | ret = cdev_add(vdev->cdev, MKDEV(VIDEO_MAJOR, vdev->minor), 1); |
7f8ecfab HV |
886 | if (ret < 0) { |
887 | printk(KERN_ERR "%s: cdev_add failed\n", __func__); | |
dc93a70c HV |
888 | kfree(vdev->cdev); |
889 | vdev->cdev = NULL; | |
890 | goto cleanup; | |
7f8ecfab | 891 | } |
dc93a70c HV |
892 | |
893 | /* Part 4: register the device with sysfs */ | |
dc93a70c HV |
894 | vdev->dev.class = &video_class; |
895 | vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor); | |
1c1d86a1 | 896 | vdev->dev.parent = vdev->dev_parent; |
22e22125 | 897 | dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num); |
dc93a70c | 898 | ret = device_register(&vdev->dev); |
27a5e6d3 HV |
899 | if (ret < 0) { |
900 | printk(KERN_ERR "%s: device_register failed\n", __func__); | |
dc93a70c | 901 | goto cleanup; |
27a5e6d3 | 902 | } |
dc93a70c HV |
903 | /* Register the release callback that will be called when the last |
904 | reference to the device goes away. */ | |
905 | vdev->dev.release = v4l2_device_release; | |
27a5e6d3 | 906 | |
6b5270d2 | 907 | if (nr != -1 && nr != vdev->num && warn_if_nr_in_use) |
eac8ea53 LP |
908 | printk(KERN_WARNING "%s: requested %s%d, got %s\n", __func__, |
909 | name_base, nr, video_device_node_name(vdev)); | |
bedf8bcf HV |
910 | |
911 | /* Increase v4l2_device refcount */ | |
912 | if (vdev->v4l2_dev) | |
913 | v4l2_device_get(vdev->v4l2_dev); | |
914 | ||
2c0ab67b LP |
915 | #if defined(CONFIG_MEDIA_CONTROLLER) |
916 | /* Part 5: Register the entity. */ | |
c4f0b78a LP |
917 | if (vdev->v4l2_dev && vdev->v4l2_dev->mdev && |
918 | vdev->vfl_type != VFL_TYPE_SUBDEV) { | |
2c0ab67b LP |
919 | vdev->entity.type = MEDIA_ENT_T_DEVNODE_V4L; |
920 | vdev->entity.name = vdev->name; | |
fa5034c6 CL |
921 | vdev->entity.info.v4l.major = VIDEO_MAJOR; |
922 | vdev->entity.info.v4l.minor = vdev->minor; | |
2c0ab67b LP |
923 | ret = media_device_register_entity(vdev->v4l2_dev->mdev, |
924 | &vdev->entity); | |
925 | if (ret < 0) | |
926 | printk(KERN_WARNING | |
927 | "%s: media_device_register_entity failed\n", | |
928 | __func__); | |
929 | } | |
930 | #endif | |
931 | /* Part 6: Activate this minor. The char device can now be used. */ | |
957b4aa9 | 932 | set_bit(V4L2_FL_REGISTERED, &vdev->flags); |
dc93a70c HV |
933 | mutex_lock(&videodev_lock); |
934 | video_device[vdev->minor] = vdev; | |
935 | mutex_unlock(&videodev_lock); | |
2c0ab67b | 936 | |
dc93a70c | 937 | return 0; |
7f8ecfab | 938 | |
dc93a70c | 939 | cleanup: |
27a5e6d3 | 940 | mutex_lock(&videodev_lock); |
dc93a70c HV |
941 | if (vdev->cdev) |
942 | cdev_del(vdev->cdev); | |
5062cb70 | 943 | devnode_clear(vdev); |
27a5e6d3 | 944 | mutex_unlock(&videodev_lock); |
dc93a70c HV |
945 | /* Mark this video device as never having been registered. */ |
946 | vdev->minor = -1; | |
27a5e6d3 HV |
947 | return ret; |
948 | } | |
2096a5dc | 949 | EXPORT_SYMBOL(__video_register_device); |
6b5270d2 | 950 | |
27a5e6d3 HV |
951 | /** |
952 | * video_unregister_device - unregister a video4linux device | |
dc93a70c | 953 | * @vdev: the device to unregister |
27a5e6d3 | 954 | * |
dc93a70c HV |
955 | * This unregisters the passed device. Future open calls will |
956 | * be met with errors. | |
27a5e6d3 | 957 | */ |
dc93a70c | 958 | void video_unregister_device(struct video_device *vdev) |
27a5e6d3 | 959 | { |
dc93a70c | 960 | /* Check if vdev was ever registered at all */ |
957b4aa9 | 961 | if (!vdev || !video_is_registered(vdev)) |
dc93a70c HV |
962 | return; |
963 | ||
ca9afe6f HV |
964 | mutex_lock(&videodev_lock); |
965 | /* This must be in a critical section to prevent a race with v4l2_open. | |
966 | * Once this bit has been cleared video_get may never be called again. | |
967 | */ | |
957b4aa9 | 968 | clear_bit(V4L2_FL_REGISTERED, &vdev->flags); |
ca9afe6f | 969 | mutex_unlock(&videodev_lock); |
dc93a70c | 970 | device_unregister(&vdev->dev); |
27a5e6d3 HV |
971 | } |
972 | EXPORT_SYMBOL(video_unregister_device); | |
973 | ||
27a5e6d3 HV |
974 | /* |
975 | * Initialise video for linux | |
976 | */ | |
27a5e6d3 HV |
977 | static int __init videodev_init(void) |
978 | { | |
7f8ecfab | 979 | dev_t dev = MKDEV(VIDEO_MAJOR, 0); |
27a5e6d3 HV |
980 | int ret; |
981 | ||
982 | printk(KERN_INFO "Linux video capture interface: v2.00\n"); | |
7f8ecfab HV |
983 | ret = register_chrdev_region(dev, VIDEO_NUM_DEVICES, VIDEO_NAME); |
984 | if (ret < 0) { | |
985 | printk(KERN_WARNING "videodev: unable to get major %d\n", | |
986 | VIDEO_MAJOR); | |
987 | return ret; | |
27a5e6d3 HV |
988 | } |
989 | ||
990 | ret = class_register(&video_class); | |
991 | if (ret < 0) { | |
7f8ecfab | 992 | unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); |
27a5e6d3 HV |
993 | printk(KERN_WARNING "video_dev: class_register failed\n"); |
994 | return -EIO; | |
995 | } | |
996 | ||
997 | return 0; | |
998 | } | |
999 | ||
1000 | static void __exit videodev_exit(void) | |
1001 | { | |
7f8ecfab HV |
1002 | dev_t dev = MKDEV(VIDEO_MAJOR, 0); |
1003 | ||
27a5e6d3 | 1004 | class_unregister(&video_class); |
7f8ecfab | 1005 | unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); |
27a5e6d3 HV |
1006 | } |
1007 | ||
ee981c6f | 1008 | subsys_initcall(videodev_init); |
27a5e6d3 HV |
1009 | module_exit(videodev_exit) |
1010 | ||
1011 | MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@infradead.org>"); | |
1012 | MODULE_DESCRIPTION("Device registrar for Video4Linux drivers v2"); | |
1013 | MODULE_LICENSE("GPL"); | |
cbb72b0f | 1014 | MODULE_ALIAS_CHARDEV_MAJOR(VIDEO_MAJOR); |
27a5e6d3 HV |
1015 | |
1016 | ||
1017 | /* | |
1018 | * Local variables: | |
1019 | * c-basic-offset: 8 | |
1020 | * End: | |
1021 | */ |