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 | ||
13e2237f GKH |
41 | static ssize_t index_show(struct device *cd, |
42 | struct device_attribute *attr, char *buf) | |
27a5e6d3 | 43 | { |
dc93a70c | 44 | struct video_device *vdev = to_video_device(cd); |
bfa8a273 | 45 | |
dc93a70c | 46 | return sprintf(buf, "%i\n", vdev->index); |
27a5e6d3 | 47 | } |
13e2237f | 48 | static DEVICE_ATTR_RO(index); |
27a5e6d3 | 49 | |
13e2237f GKH |
50 | static ssize_t debug_show(struct device *cd, |
51 | struct device_attribute *attr, char *buf) | |
80131fe0 HV |
52 | { |
53 | struct video_device *vdev = to_video_device(cd); | |
54 | ||
55 | return sprintf(buf, "%i\n", vdev->debug); | |
56 | } | |
57 | ||
13e2237f GKH |
58 | static ssize_t debug_store(struct device *cd, struct device_attribute *attr, |
59 | const char *buf, size_t len) | |
80131fe0 HV |
60 | { |
61 | struct video_device *vdev = to_video_device(cd); | |
62 | int res = 0; | |
63 | u16 value; | |
64 | ||
65 | res = kstrtou16(buf, 0, &value); | |
66 | if (res) | |
67 | return res; | |
68 | ||
69 | vdev->debug = value; | |
70 | return len; | |
71 | } | |
13e2237f | 72 | static DEVICE_ATTR_RW(debug); |
80131fe0 | 73 | |
13e2237f | 74 | static ssize_t name_show(struct device *cd, |
27a5e6d3 HV |
75 | struct device_attribute *attr, char *buf) |
76 | { | |
dc93a70c | 77 | struct video_device *vdev = to_video_device(cd); |
bfa8a273 | 78 | |
dc93a70c | 79 | return sprintf(buf, "%.*s\n", (int)sizeof(vdev->name), vdev->name); |
27a5e6d3 | 80 | } |
13e2237f | 81 | static DEVICE_ATTR_RO(name); |
27a5e6d3 | 82 | |
13e2237f GKH |
83 | static struct attribute *video_device_attrs[] = { |
84 | &dev_attr_name.attr, | |
85 | &dev_attr_debug.attr, | |
86 | &dev_attr_index.attr, | |
87 | NULL, | |
27a5e6d3 | 88 | }; |
13e2237f | 89 | ATTRIBUTE_GROUPS(video_device); |
27a5e6d3 | 90 | |
7f8ecfab HV |
91 | /* |
92 | * Active devices | |
93 | */ | |
94 | static struct video_device *video_device[VIDEO_NUM_DEVICES]; | |
95 | static DEFINE_MUTEX(videodev_lock); | |
22e22125 | 96 | static DECLARE_BITMAP(devnode_nums[VFL_TYPE_MAX], VIDEO_NUM_DEVICES); |
7f8ecfab | 97 | |
5062cb70 HV |
98 | /* Device node utility functions */ |
99 | ||
100 | /* Note: these utility functions all assume that vfl_type is in the range | |
101 | [0, VFL_TYPE_MAX-1]. */ | |
102 | ||
103 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES | |
104 | /* Return the bitmap corresponding to vfl_type. */ | |
105 | static inline unsigned long *devnode_bits(int vfl_type) | |
106 | { | |
107 | /* Any types not assigned to fixed minor ranges must be mapped to | |
108 | one single bitmap for the purposes of finding a free node number | |
109 | since all those unassigned types use the same minor range. */ | |
226c0eea | 110 | int idx = (vfl_type > VFL_TYPE_RADIO) ? VFL_TYPE_MAX - 1 : vfl_type; |
5062cb70 HV |
111 | |
112 | return devnode_nums[idx]; | |
113 | } | |
114 | #else | |
115 | /* Return the bitmap corresponding to vfl_type. */ | |
116 | static inline unsigned long *devnode_bits(int vfl_type) | |
117 | { | |
118 | return devnode_nums[vfl_type]; | |
119 | } | |
120 | #endif | |
121 | ||
122 | /* Mark device node number vdev->num as used */ | |
123 | static inline void devnode_set(struct video_device *vdev) | |
124 | { | |
125 | set_bit(vdev->num, devnode_bits(vdev->vfl_type)); | |
126 | } | |
127 | ||
128 | /* Mark device node number vdev->num as unused */ | |
129 | static inline void devnode_clear(struct video_device *vdev) | |
130 | { | |
131 | clear_bit(vdev->num, devnode_bits(vdev->vfl_type)); | |
132 | } | |
133 | ||
134 | /* Try to find a free device node number in the range [from, to> */ | |
135 | static inline int devnode_find(struct video_device *vdev, int from, int to) | |
136 | { | |
137 | return find_next_zero_bit(devnode_bits(vdev->vfl_type), to, from); | |
138 | } | |
139 | ||
27a5e6d3 HV |
140 | struct video_device *video_device_alloc(void) |
141 | { | |
bfa8a273 | 142 | return kzalloc(sizeof(struct video_device), GFP_KERNEL); |
27a5e6d3 HV |
143 | } |
144 | EXPORT_SYMBOL(video_device_alloc); | |
145 | ||
dc93a70c | 146 | void video_device_release(struct video_device *vdev) |
27a5e6d3 | 147 | { |
dc93a70c | 148 | kfree(vdev); |
27a5e6d3 HV |
149 | } |
150 | EXPORT_SYMBOL(video_device_release); | |
151 | ||
dc93a70c | 152 | void video_device_release_empty(struct video_device *vdev) |
f9e86b5e HV |
153 | { |
154 | /* Do nothing */ | |
155 | /* Only valid when the video_device struct is a static. */ | |
156 | } | |
157 | EXPORT_SYMBOL(video_device_release_empty); | |
158 | ||
dc93a70c | 159 | static inline void video_get(struct video_device *vdev) |
7f8ecfab | 160 | { |
dc93a70c HV |
161 | get_device(&vdev->dev); |
162 | } | |
163 | ||
164 | static inline void video_put(struct video_device *vdev) | |
165 | { | |
166 | put_device(&vdev->dev); | |
167 | } | |
168 | ||
169 | /* Called when the last user of the video device exits. */ | |
170 | static void v4l2_device_release(struct device *cd) | |
171 | { | |
172 | struct video_device *vdev = to_video_device(cd); | |
bedf8bcf | 173 | struct v4l2_device *v4l2_dev = vdev->v4l2_dev; |
7f8ecfab HV |
174 | |
175 | mutex_lock(&videodev_lock); | |
1fc2b5f7 | 176 | if (WARN_ON(video_device[vdev->minor] != vdev)) { |
dc93a70c | 177 | /* should not happen */ |
1fc2b5f7 | 178 | mutex_unlock(&videodev_lock); |
6ea9a182 HV |
179 | return; |
180 | } | |
7f8ecfab HV |
181 | |
182 | /* Free up this device for reuse */ | |
dc93a70c | 183 | video_device[vdev->minor] = NULL; |
7f8ecfab | 184 | |
dc93a70c HV |
185 | /* Delete the cdev on this minor as well */ |
186 | cdev_del(vdev->cdev); | |
187 | /* Just in case some driver tries to access this from | |
188 | the release() callback. */ | |
189 | vdev->cdev = NULL; | |
7f8ecfab | 190 | |
22e22125 | 191 | /* Mark device node number as free */ |
5062cb70 | 192 | devnode_clear(vdev); |
7f8ecfab | 193 | |
dc93a70c | 194 | mutex_unlock(&videodev_lock); |
27a5e6d3 | 195 | |
c064b8ea | 196 | #if defined(CONFIG_MEDIA_CONTROLLER) |
d9bfbcc0 | 197 | if (v4l2_dev->mdev && |
c064b8ea LP |
198 | vdev->vfl_type != VFL_TYPE_SUBDEV) |
199 | media_device_unregister_entity(&vdev->entity); | |
200 | #endif | |
201 | ||
8280b662 HV |
202 | /* Do not call v4l2_device_put if there is no release callback set. |
203 | * Drivers that have no v4l2_device release callback might free the | |
204 | * v4l2_dev instance in the video_device release callback below, so we | |
205 | * must perform this check here. | |
206 | * | |
207 | * TODO: In the long run all drivers that use v4l2_device should use the | |
208 | * v4l2_device release callback. This check will then be unnecessary. | |
209 | */ | |
d9bfbcc0 | 210 | if (v4l2_dev->release == NULL) |
8280b662 HV |
211 | v4l2_dev = NULL; |
212 | ||
dc93a70c HV |
213 | /* Release video_device and perform other |
214 | cleanups as needed. */ | |
215 | vdev->release(vdev); | |
bedf8bcf HV |
216 | |
217 | /* Decrease v4l2_device refcount */ | |
218 | if (v4l2_dev) | |
219 | v4l2_device_put(v4l2_dev); | |
27a5e6d3 HV |
220 | } |
221 | ||
222 | static struct class video_class = { | |
223 | .name = VIDEO_NAME, | |
13e2237f | 224 | .dev_groups = video_device_groups, |
27a5e6d3 HV |
225 | }; |
226 | ||
27a5e6d3 HV |
227 | struct video_device *video_devdata(struct file *file) |
228 | { | |
496ad9aa | 229 | return video_device[iminor(file_inode(file))]; |
27a5e6d3 HV |
230 | } |
231 | EXPORT_SYMBOL(video_devdata); | |
232 | ||
02265493 HV |
233 | |
234 | /* Priority handling */ | |
235 | ||
236 | static inline bool prio_is_valid(enum v4l2_priority prio) | |
237 | { | |
238 | return prio == V4L2_PRIORITY_BACKGROUND || | |
239 | prio == V4L2_PRIORITY_INTERACTIVE || | |
240 | prio == V4L2_PRIORITY_RECORD; | |
241 | } | |
242 | ||
243 | void v4l2_prio_init(struct v4l2_prio_state *global) | |
244 | { | |
245 | memset(global, 0, sizeof(*global)); | |
246 | } | |
247 | EXPORT_SYMBOL(v4l2_prio_init); | |
248 | ||
249 | int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local, | |
250 | enum v4l2_priority new) | |
251 | { | |
252 | if (!prio_is_valid(new)) | |
253 | return -EINVAL; | |
254 | if (*local == new) | |
255 | return 0; | |
256 | ||
257 | atomic_inc(&global->prios[new]); | |
258 | if (prio_is_valid(*local)) | |
259 | atomic_dec(&global->prios[*local]); | |
260 | *local = new; | |
261 | return 0; | |
262 | } | |
263 | EXPORT_SYMBOL(v4l2_prio_change); | |
264 | ||
265 | void v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local) | |
266 | { | |
267 | v4l2_prio_change(global, local, V4L2_PRIORITY_DEFAULT); | |
268 | } | |
269 | EXPORT_SYMBOL(v4l2_prio_open); | |
270 | ||
271 | void v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority local) | |
272 | { | |
273 | if (prio_is_valid(local)) | |
274 | atomic_dec(&global->prios[local]); | |
275 | } | |
276 | EXPORT_SYMBOL(v4l2_prio_close); | |
277 | ||
278 | enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global) | |
279 | { | |
280 | if (atomic_read(&global->prios[V4L2_PRIORITY_RECORD]) > 0) | |
281 | return V4L2_PRIORITY_RECORD; | |
282 | if (atomic_read(&global->prios[V4L2_PRIORITY_INTERACTIVE]) > 0) | |
283 | return V4L2_PRIORITY_INTERACTIVE; | |
284 | if (atomic_read(&global->prios[V4L2_PRIORITY_BACKGROUND]) > 0) | |
285 | return V4L2_PRIORITY_BACKGROUND; | |
286 | return V4L2_PRIORITY_UNSET; | |
287 | } | |
288 | EXPORT_SYMBOL(v4l2_prio_max); | |
289 | ||
290 | int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority local) | |
291 | { | |
292 | return (local < v4l2_prio_max(global)) ? -EBUSY : 0; | |
293 | } | |
294 | EXPORT_SYMBOL(v4l2_prio_check); | |
295 | ||
296 | ||
dc93a70c HV |
297 | static ssize_t v4l2_read(struct file *filp, char __user *buf, |
298 | size_t sz, loff_t *off) | |
299 | { | |
300 | struct video_device *vdev = video_devdata(filp); | |
2877842d | 301 | int ret = -ENODEV; |
dc93a70c HV |
302 | |
303 | if (!vdev->fops->read) | |
304 | return -EINVAL; | |
ee6869af HV |
305 | if (video_is_registered(vdev)) |
306 | ret = vdev->fops->read(filp, buf, sz, off); | |
cc4b7e7f HV |
307 | if (vdev->debug) |
308 | printk(KERN_DEBUG "%s: read: %zd (%d)\n", | |
309 | video_device_node_name(vdev), sz, ret); | |
ee6869af | 310 | return ret; |
dc93a70c HV |
311 | } |
312 | ||
313 | static ssize_t v4l2_write(struct file *filp, const char __user *buf, | |
314 | size_t sz, loff_t *off) | |
315 | { | |
316 | struct video_device *vdev = video_devdata(filp); | |
2877842d | 317 | int ret = -ENODEV; |
dc93a70c HV |
318 | |
319 | if (!vdev->fops->write) | |
320 | return -EINVAL; | |
ee6869af HV |
321 | if (video_is_registered(vdev)) |
322 | ret = vdev->fops->write(filp, buf, sz, off); | |
cc4b7e7f HV |
323 | if (vdev->debug) |
324 | printk(KERN_DEBUG "%s: write: %zd (%d)\n", | |
325 | video_device_node_name(vdev), sz, ret); | |
ee6869af | 326 | return ret; |
dc93a70c HV |
327 | } |
328 | ||
329 | static unsigned int v4l2_poll(struct file *filp, struct poll_table_struct *poll) | |
330 | { | |
331 | struct video_device *vdev = video_devdata(filp); | |
cf533735 | 332 | unsigned int res = POLLERR | POLLHUP; |
ee6869af HV |
333 | |
334 | if (!vdev->fops->poll) | |
2877842d | 335 | return DEFAULT_POLLMASK; |
ee6869af | 336 | if (video_is_registered(vdev)) |
cf533735 | 337 | res = vdev->fops->poll(filp, poll); |
57fc8eb1 | 338 | if (vdev->debug > 2) |
cc4b7e7f | 339 | printk(KERN_DEBUG "%s: poll: %08x\n", |
cf533735 HV |
340 | video_device_node_name(vdev), res); |
341 | return res; | |
dc93a70c HV |
342 | } |
343 | ||
86a5ef7d | 344 | static long v4l2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
dc93a70c HV |
345 | { |
346 | struct video_device *vdev = video_devdata(filp); | |
72420630 | 347 | int ret = -ENODEV; |
dc93a70c | 348 | |
86a5ef7d | 349 | if (vdev->fops->unlocked_ioctl) { |
5a5adf6b | 350 | struct mutex *lock = v4l2_ioctl_get_lock(vdev, cmd); |
8ab75e3e | 351 | |
5a5adf6b HV |
352 | if (lock && mutex_lock_interruptible(lock)) |
353 | return -ERESTARTSYS; | |
72420630 MCC |
354 | if (video_is_registered(vdev)) |
355 | ret = vdev->fops->unlocked_ioctl(filp, cmd, arg); | |
5a5adf6b HV |
356 | if (lock) |
357 | mutex_unlock(lock); | |
86a5ef7d | 358 | } else if (vdev->fops->ioctl) { |
879aa24d HV |
359 | /* This code path is a replacement for the BKL. It is a major |
360 | * hack but it will have to do for those drivers that are not | |
361 | * yet converted to use unlocked_ioctl. | |
362 | * | |
d9bfbcc0 HV |
363 | * All drivers implement struct v4l2_device, so we use the |
364 | * lock defined there to serialize the ioctls. | |
879aa24d | 365 | * |
d9bfbcc0 HV |
366 | * However, if the driver sleeps, then it blocks all ioctls |
367 | * since the lock is still held. This is very common for | |
368 | * VIDIOC_DQBUF since that normally waits for a frame to arrive. | |
369 | * As a result any other ioctl calls will proceed very, very | |
370 | * slowly since each call will have to wait for the VIDIOC_QBUF | |
371 | * to finish. Things that should take 0.01s may now take 10-20 | |
372 | * seconds. | |
879aa24d HV |
373 | * |
374 | * The workaround is to *not* take the lock for VIDIOC_DQBUF. | |
375 | * This actually works OK for videobuf-based drivers, since | |
376 | * videobuf will take its own internal lock. | |
377 | */ | |
d9bfbcc0 | 378 | struct mutex *m = &vdev->v4l2_dev->ioctl_lock; |
0edf2e5e | 379 | |
879aa24d HV |
380 | if (cmd != VIDIOC_DQBUF && mutex_lock_interruptible(m)) |
381 | return -ERESTARTSYS; | |
72420630 MCC |
382 | if (video_is_registered(vdev)) |
383 | ret = vdev->fops->ioctl(filp, cmd, arg); | |
879aa24d HV |
384 | if (cmd != VIDIOC_DQBUF) |
385 | mutex_unlock(m); | |
86a5ef7d AB |
386 | } else |
387 | ret = -ENOTTY; | |
dc93a70c | 388 | |
86a5ef7d | 389 | return ret; |
dc93a70c HV |
390 | } |
391 | ||
ecc6517d BL |
392 | #ifdef CONFIG_MMU |
393 | #define v4l2_get_unmapped_area NULL | |
394 | #else | |
395 | static unsigned long v4l2_get_unmapped_area(struct file *filp, | |
396 | unsigned long addr, unsigned long len, unsigned long pgoff, | |
397 | unsigned long flags) | |
398 | { | |
399 | struct video_device *vdev = video_devdata(filp); | |
cc4b7e7f | 400 | int ret; |
ecc6517d BL |
401 | |
402 | if (!vdev->fops->get_unmapped_area) | |
403 | return -ENOSYS; | |
404 | if (!video_is_registered(vdev)) | |
405 | return -ENODEV; | |
cc4b7e7f HV |
406 | ret = vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags); |
407 | if (vdev->debug) | |
408 | printk(KERN_DEBUG "%s: get_unmapped_area (%d)\n", | |
409 | video_device_node_name(vdev), ret); | |
410 | return ret; | |
ecc6517d BL |
411 | } |
412 | #endif | |
413 | ||
dc93a70c HV |
414 | static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm) |
415 | { | |
416 | struct video_device *vdev = video_devdata(filp); | |
ee6869af HV |
417 | int ret = -ENODEV; |
418 | ||
419 | if (!vdev->fops->mmap) | |
cf533735 | 420 | return -ENODEV; |
ee6869af HV |
421 | if (video_is_registered(vdev)) |
422 | ret = vdev->fops->mmap(filp, vm); | |
cc4b7e7f HV |
423 | if (vdev->debug) |
424 | printk(KERN_DEBUG "%s: mmap (%d)\n", | |
425 | video_device_node_name(vdev), ret); | |
ee6869af | 426 | return ret; |
dc93a70c HV |
427 | } |
428 | ||
429 | /* Override for the open function */ | |
430 | static int v4l2_open(struct inode *inode, struct file *filp) | |
431 | { | |
432 | struct video_device *vdev; | |
65d9ff9c | 433 | int ret = 0; |
dc93a70c HV |
434 | |
435 | /* Check if the video device is available */ | |
436 | mutex_lock(&videodev_lock); | |
437 | vdev = video_devdata(filp); | |
ee6869af | 438 | /* return ENODEV if the video device has already been removed. */ |
ca9afe6f | 439 | if (vdev == NULL || !video_is_registered(vdev)) { |
dc93a70c HV |
440 | mutex_unlock(&videodev_lock); |
441 | return -ENODEV; | |
442 | } | |
443 | /* and increase the device refcount */ | |
444 | video_get(vdev); | |
445 | mutex_unlock(&videodev_lock); | |
ee6869af | 446 | if (vdev->fops->open) { |
ee6869af HV |
447 | if (video_is_registered(vdev)) |
448 | ret = vdev->fops->open(filp); | |
449 | else | |
450 | ret = -ENODEV; | |
ee6869af | 451 | } |
65d9ff9c | 452 | |
cc4b7e7f HV |
453 | if (vdev->debug) |
454 | printk(KERN_DEBUG "%s: open (%d)\n", | |
455 | video_device_node_name(vdev), ret); | |
8f695d3f EG |
456 | /* decrease the refcount in case of an error */ |
457 | if (ret) | |
458 | video_put(vdev); | |
dc93a70c HV |
459 | return ret; |
460 | } | |
461 | ||
462 | /* Override for the release function */ | |
463 | static int v4l2_release(struct inode *inode, struct file *filp) | |
464 | { | |
465 | struct video_device *vdev = video_devdata(filp); | |
65d9ff9c HV |
466 | int ret = 0; |
467 | ||
cf533735 HV |
468 | if (vdev->fops->release) |
469 | ret = vdev->fops->release(filp); | |
cc4b7e7f HV |
470 | if (vdev->debug) |
471 | printk(KERN_DEBUG "%s: release\n", | |
472 | video_device_node_name(vdev)); | |
cf533735 | 473 | |
8f695d3f EG |
474 | /* decrease the refcount unconditionally since the release() |
475 | return value is ignored. */ | |
476 | video_put(vdev); | |
dc93a70c HV |
477 | return ret; |
478 | } | |
479 | ||
dc93a70c HV |
480 | static const struct file_operations v4l2_fops = { |
481 | .owner = THIS_MODULE, | |
482 | .read = v4l2_read, | |
483 | .write = v4l2_write, | |
484 | .open = v4l2_open, | |
ecc6517d | 485 | .get_unmapped_area = v4l2_get_unmapped_area, |
dc93a70c | 486 | .mmap = v4l2_mmap, |
86a5ef7d | 487 | .unlocked_ioctl = v4l2_ioctl, |
dc93a70c | 488 | #ifdef CONFIG_COMPAT |
9bb7cde7 | 489 | .compat_ioctl = v4l2_compat_ioctl32, |
dc93a70c HV |
490 | #endif |
491 | .release = v4l2_release, | |
492 | .poll = v4l2_poll, | |
493 | .llseek = no_llseek, | |
494 | }; | |
495 | ||
27a5e6d3 | 496 | /** |
1c1d86a1 HV |
497 | * get_index - assign stream index number based on v4l2_dev |
498 | * @vdev: video_device to assign index number to, vdev->v4l2_dev should be assigned | |
27a5e6d3 | 499 | * |
dc93a70c | 500 | * Note that when this is called the new device has not yet been registered |
7ae0cd9b | 501 | * in the video_device array, but it was able to obtain a minor number. |
27a5e6d3 | 502 | * |
7ae0cd9b HV |
503 | * This means that we can always obtain a free stream index number since |
504 | * the worst case scenario is that there are VIDEO_NUM_DEVICES - 1 slots in | |
505 | * use of the video_device array. | |
506 | * | |
507 | * Returns a free index number. | |
27a5e6d3 | 508 | */ |
7ae0cd9b | 509 | static int get_index(struct video_device *vdev) |
27a5e6d3 | 510 | { |
775a05dd HV |
511 | /* This can be static since this function is called with the global |
512 | videodev_lock held. */ | |
513 | static DECLARE_BITMAP(used, VIDEO_NUM_DEVICES); | |
27a5e6d3 HV |
514 | int i; |
515 | ||
775a05dd | 516 | bitmap_zero(used, VIDEO_NUM_DEVICES); |
806e5b7c | 517 | |
27a5e6d3 HV |
518 | for (i = 0; i < VIDEO_NUM_DEVICES; i++) { |
519 | if (video_device[i] != NULL && | |
1c1d86a1 | 520 | video_device[i]->v4l2_dev == vdev->v4l2_dev) { |
775a05dd | 521 | set_bit(video_device[i]->index, used); |
27a5e6d3 HV |
522 | } |
523 | } | |
524 | ||
7ae0cd9b | 525 | return find_first_zero_bit(used, VIDEO_NUM_DEVICES); |
27a5e6d3 HV |
526 | } |
527 | ||
48ea0be0 HV |
528 | #define SET_VALID_IOCTL(ops, cmd, op) \ |
529 | if (ops->op) \ | |
530 | set_bit(_IOC_NR(cmd), valid_ioctls) | |
531 | ||
532 | /* This determines which ioctls are actually implemented in the driver. | |
533 | It's a one-time thing which simplifies video_ioctl2 as it can just do | |
534 | a bit test. | |
535 | ||
536 | Note that drivers can override this by setting bits to 1 in | |
537 | vdev->valid_ioctls. If an ioctl is marked as 1 when this function is | |
538 | called, then that ioctl will actually be marked as unimplemented. | |
539 | ||
540 | It does that by first setting up the local valid_ioctls bitmap, and | |
541 | at the end do a: | |
542 | ||
543 | vdev->valid_ioctls = valid_ioctls & ~(vdev->valid_ioctls) | |
544 | */ | |
545 | static void determine_valid_ioctls(struct video_device *vdev) | |
546 | { | |
547 | DECLARE_BITMAP(valid_ioctls, BASE_VIDIOC_PRIVATE); | |
548 | const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops; | |
4b20259f HV |
549 | bool is_vid = vdev->vfl_type == VFL_TYPE_GRABBER; |
550 | bool is_vbi = vdev->vfl_type == VFL_TYPE_VBI; | |
bfffd743 | 551 | bool is_radio = vdev->vfl_type == VFL_TYPE_RADIO; |
582c52cb | 552 | bool is_sdr = vdev->vfl_type == VFL_TYPE_SDR; |
4b20259f HV |
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 | 560 | SET_VALID_IOCTL(ops, VIDIOC_QUERYCAP, vidioc_querycap); |
b7284bb0 | 561 | if (ops->vidioc_g_priority) |
48ea0be0 | 562 | set_bit(_IOC_NR(VIDIOC_G_PRIORITY), valid_ioctls); |
b7284bb0 | 563 | if (ops->vidioc_s_priority) |
48ea0be0 | 564 | set_bit(_IOC_NR(VIDIOC_S_PRIORITY), valid_ioctls); |
90d0fc49 HV |
565 | /* Note: the control handler can also be passed through the filehandle, |
566 | and that can't be tested here. If the bit for these control ioctls | |
567 | is set, then the ioctl is valid. But if it is 0, then it can still | |
568 | be valid if the filehandle passed the control handler. */ | |
569 | if (vdev->ctrl_handler || ops->vidioc_queryctrl) | |
570 | set_bit(_IOC_NR(VIDIOC_QUERYCTRL), valid_ioctls); | |
e6bee368 HV |
571 | if (vdev->ctrl_handler || ops->vidioc_query_ext_ctrl) |
572 | set_bit(_IOC_NR(VIDIOC_QUERY_EXT_CTRL), valid_ioctls); | |
90d0fc49 HV |
573 | if (vdev->ctrl_handler || ops->vidioc_g_ctrl || ops->vidioc_g_ext_ctrls) |
574 | set_bit(_IOC_NR(VIDIOC_G_CTRL), valid_ioctls); | |
575 | if (vdev->ctrl_handler || ops->vidioc_s_ctrl || ops->vidioc_s_ext_ctrls) | |
576 | set_bit(_IOC_NR(VIDIOC_S_CTRL), valid_ioctls); | |
577 | if (vdev->ctrl_handler || ops->vidioc_g_ext_ctrls) | |
578 | set_bit(_IOC_NR(VIDIOC_G_EXT_CTRLS), valid_ioctls); | |
579 | if (vdev->ctrl_handler || ops->vidioc_s_ext_ctrls) | |
580 | set_bit(_IOC_NR(VIDIOC_S_EXT_CTRLS), valid_ioctls); | |
581 | if (vdev->ctrl_handler || ops->vidioc_try_ext_ctrls) | |
582 | set_bit(_IOC_NR(VIDIOC_TRY_EXT_CTRLS), valid_ioctls); | |
583 | if (vdev->ctrl_handler || ops->vidioc_querymenu) | |
584 | set_bit(_IOC_NR(VIDIOC_QUERYMENU), valid_ioctls); | |
585 | SET_VALID_IOCTL(ops, VIDIOC_G_FREQUENCY, vidioc_g_frequency); | |
586 | SET_VALID_IOCTL(ops, VIDIOC_S_FREQUENCY, vidioc_s_frequency); | |
587 | SET_VALID_IOCTL(ops, VIDIOC_LOG_STATUS, vidioc_log_status); | |
588 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
96b03d2a | 589 | set_bit(_IOC_NR(VIDIOC_DBG_G_CHIP_INFO), valid_ioctls); |
79b0c640 HV |
590 | set_bit(_IOC_NR(VIDIOC_DBG_G_REGISTER), valid_ioctls); |
591 | set_bit(_IOC_NR(VIDIOC_DBG_S_REGISTER), valid_ioctls); | |
90d0fc49 | 592 | #endif |
90d0fc49 HV |
593 | /* yes, really vidioc_subscribe_event */ |
594 | SET_VALID_IOCTL(ops, VIDIOC_DQEVENT, vidioc_subscribe_event); | |
595 | SET_VALID_IOCTL(ops, VIDIOC_SUBSCRIBE_EVENT, vidioc_subscribe_event); | |
596 | SET_VALID_IOCTL(ops, VIDIOC_UNSUBSCRIBE_EVENT, vidioc_unsubscribe_event); | |
90d0fc49 HV |
597 | if (ops->vidioc_enum_freq_bands || ops->vidioc_g_tuner || ops->vidioc_g_modulator) |
598 | set_bit(_IOC_NR(VIDIOC_ENUM_FREQ_BANDS), valid_ioctls); | |
599 | ||
4b20259f | 600 | if (is_vid) { |
90d0fc49 | 601 | /* video specific ioctls */ |
4b20259f HV |
602 | if ((is_rx && (ops->vidioc_enum_fmt_vid_cap || |
603 | ops->vidioc_enum_fmt_vid_cap_mplane || | |
604 | ops->vidioc_enum_fmt_vid_overlay)) || | |
605 | (is_tx && (ops->vidioc_enum_fmt_vid_out || | |
606 | ops->vidioc_enum_fmt_vid_out_mplane))) | |
607 | set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls); | |
608 | if ((is_rx && (ops->vidioc_g_fmt_vid_cap || | |
609 | ops->vidioc_g_fmt_vid_cap_mplane || | |
610 | ops->vidioc_g_fmt_vid_overlay)) || | |
611 | (is_tx && (ops->vidioc_g_fmt_vid_out || | |
612 | ops->vidioc_g_fmt_vid_out_mplane || | |
613 | ops->vidioc_g_fmt_vid_out_overlay))) | |
614 | set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); | |
615 | if ((is_rx && (ops->vidioc_s_fmt_vid_cap || | |
616 | ops->vidioc_s_fmt_vid_cap_mplane || | |
617 | ops->vidioc_s_fmt_vid_overlay)) || | |
618 | (is_tx && (ops->vidioc_s_fmt_vid_out || | |
619 | ops->vidioc_s_fmt_vid_out_mplane || | |
620 | ops->vidioc_s_fmt_vid_out_overlay))) | |
621 | set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); | |
622 | if ((is_rx && (ops->vidioc_try_fmt_vid_cap || | |
623 | ops->vidioc_try_fmt_vid_cap_mplane || | |
624 | ops->vidioc_try_fmt_vid_overlay)) || | |
625 | (is_tx && (ops->vidioc_try_fmt_vid_out || | |
626 | ops->vidioc_try_fmt_vid_out_mplane || | |
627 | ops->vidioc_try_fmt_vid_out_overlay))) | |
628 | set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); | |
90d0fc49 HV |
629 | SET_VALID_IOCTL(ops, VIDIOC_OVERLAY, vidioc_overlay); |
630 | SET_VALID_IOCTL(ops, VIDIOC_G_FBUF, vidioc_g_fbuf); | |
631 | SET_VALID_IOCTL(ops, VIDIOC_S_FBUF, vidioc_s_fbuf); | |
632 | SET_VALID_IOCTL(ops, VIDIOC_G_JPEGCOMP, vidioc_g_jpegcomp); | |
633 | SET_VALID_IOCTL(ops, VIDIOC_S_JPEGCOMP, vidioc_s_jpegcomp); | |
634 | SET_VALID_IOCTL(ops, VIDIOC_G_ENC_INDEX, vidioc_g_enc_index); | |
635 | SET_VALID_IOCTL(ops, VIDIOC_ENCODER_CMD, vidioc_encoder_cmd); | |
636 | SET_VALID_IOCTL(ops, VIDIOC_TRY_ENCODER_CMD, vidioc_try_encoder_cmd); | |
637 | SET_VALID_IOCTL(ops, VIDIOC_DECODER_CMD, vidioc_decoder_cmd); | |
638 | SET_VALID_IOCTL(ops, VIDIOC_TRY_DECODER_CMD, vidioc_try_decoder_cmd); | |
639 | SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes); | |
640 | SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals); | |
4b20259f | 641 | } else if (is_vbi) { |
90d0fc49 | 642 | /* vbi specific ioctls */ |
4b20259f HV |
643 | if ((is_rx && (ops->vidioc_g_fmt_vbi_cap || |
644 | ops->vidioc_g_fmt_sliced_vbi_cap)) || | |
645 | (is_tx && (ops->vidioc_g_fmt_vbi_out || | |
646 | ops->vidioc_g_fmt_sliced_vbi_out))) | |
647 | set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); | |
648 | if ((is_rx && (ops->vidioc_s_fmt_vbi_cap || | |
649 | ops->vidioc_s_fmt_sliced_vbi_cap)) || | |
650 | (is_tx && (ops->vidioc_s_fmt_vbi_out || | |
651 | ops->vidioc_s_fmt_sliced_vbi_out))) | |
652 | set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); | |
653 | if ((is_rx && (ops->vidioc_try_fmt_vbi_cap || | |
654 | ops->vidioc_try_fmt_sliced_vbi_cap)) || | |
655 | (is_tx && (ops->vidioc_try_fmt_vbi_out || | |
656 | ops->vidioc_try_fmt_sliced_vbi_out))) | |
657 | set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); | |
90d0fc49 | 658 | SET_VALID_IOCTL(ops, VIDIOC_G_SLICED_VBI_CAP, vidioc_g_sliced_vbi_cap); |
582c52cb AP |
659 | } else if (is_sdr) { |
660 | /* SDR specific ioctls */ | |
661 | if (ops->vidioc_enum_fmt_sdr_cap) | |
662 | set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls); | |
663 | if (ops->vidioc_g_fmt_sdr_cap) | |
664 | set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); | |
665 | if (ops->vidioc_s_fmt_sdr_cap) | |
666 | set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); | |
667 | if (ops->vidioc_try_fmt_sdr_cap) | |
668 | set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); | |
4b20259f | 669 | } |
582c52cb AP |
670 | |
671 | if (is_vid || is_vbi || is_sdr) { | |
672 | /* ioctls valid for video, vbi or sdr */ | |
5815d0c4 FS |
673 | SET_VALID_IOCTL(ops, VIDIOC_REQBUFS, vidioc_reqbufs); |
674 | SET_VALID_IOCTL(ops, VIDIOC_QUERYBUF, vidioc_querybuf); | |
675 | SET_VALID_IOCTL(ops, VIDIOC_QBUF, vidioc_qbuf); | |
676 | SET_VALID_IOCTL(ops, VIDIOC_EXPBUF, vidioc_expbuf); | |
677 | SET_VALID_IOCTL(ops, VIDIOC_DQBUF, vidioc_dqbuf); | |
678 | SET_VALID_IOCTL(ops, VIDIOC_CREATE_BUFS, vidioc_create_bufs); | |
679 | SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, vidioc_prepare_buf); | |
72be89c8 HV |
680 | SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon); |
681 | SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff); | |
582c52cb AP |
682 | } |
683 | ||
684 | if (is_vid || is_vbi) { | |
685 | /* ioctls valid for video or vbi */ | |
4b20259f HV |
686 | if (ops->vidioc_s_std) |
687 | set_bit(_IOC_NR(VIDIOC_ENUMSTD), valid_ioctls); | |
4b20259f | 688 | SET_VALID_IOCTL(ops, VIDIOC_S_STD, vidioc_s_std); |
ca371575 | 689 | SET_VALID_IOCTL(ops, VIDIOC_G_STD, vidioc_g_std); |
4b20259f | 690 | if (is_rx) { |
90d0fc49 | 691 | SET_VALID_IOCTL(ops, VIDIOC_QUERYSTD, vidioc_querystd); |
4b20259f HV |
692 | SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input); |
693 | SET_VALID_IOCTL(ops, VIDIOC_G_INPUT, vidioc_g_input); | |
694 | SET_VALID_IOCTL(ops, VIDIOC_S_INPUT, vidioc_s_input); | |
695 | SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDIO, vidioc_enumaudio); | |
696 | SET_VALID_IOCTL(ops, VIDIOC_G_AUDIO, vidioc_g_audio); | |
697 | SET_VALID_IOCTL(ops, VIDIOC_S_AUDIO, vidioc_s_audio); | |
90d0fc49 | 698 | SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings); |
dd519bb3 | 699 | SET_VALID_IOCTL(ops, VIDIOC_S_EDID, vidioc_s_edid); |
4b20259f HV |
700 | } |
701 | if (is_tx) { | |
702 | SET_VALID_IOCTL(ops, VIDIOC_ENUMOUTPUT, vidioc_enum_output); | |
703 | SET_VALID_IOCTL(ops, VIDIOC_G_OUTPUT, vidioc_g_output); | |
704 | SET_VALID_IOCTL(ops, VIDIOC_S_OUTPUT, vidioc_s_output); | |
705 | SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDOUT, vidioc_enumaudout); | |
706 | SET_VALID_IOCTL(ops, VIDIOC_G_AUDOUT, vidioc_g_audout); | |
707 | SET_VALID_IOCTL(ops, VIDIOC_S_AUDOUT, vidioc_s_audout); | |
708 | } | |
4b20259f HV |
709 | if (ops->vidioc_g_crop || ops->vidioc_g_selection) |
710 | set_bit(_IOC_NR(VIDIOC_G_CROP), valid_ioctls); | |
711 | if (ops->vidioc_s_crop || ops->vidioc_s_selection) | |
712 | set_bit(_IOC_NR(VIDIOC_S_CROP), valid_ioctls); | |
713 | SET_VALID_IOCTL(ops, VIDIOC_G_SELECTION, vidioc_g_selection); | |
714 | SET_VALID_IOCTL(ops, VIDIOC_S_SELECTION, vidioc_s_selection); | |
715 | if (ops->vidioc_cropcap || ops->vidioc_g_selection) | |
716 | set_bit(_IOC_NR(VIDIOC_CROPCAP), valid_ioctls); | |
4b20259f | 717 | if (ops->vidioc_g_parm || (vdev->vfl_type == VFL_TYPE_GRABBER && |
ca371575 | 718 | ops->vidioc_g_std)) |
4b20259f HV |
719 | set_bit(_IOC_NR(VIDIOC_G_PARM), valid_ioctls); |
720 | SET_VALID_IOCTL(ops, VIDIOC_S_PARM, vidioc_s_parm); | |
4b20259f HV |
721 | SET_VALID_IOCTL(ops, VIDIOC_S_DV_TIMINGS, vidioc_s_dv_timings); |
722 | SET_VALID_IOCTL(ops, VIDIOC_G_DV_TIMINGS, vidioc_g_dv_timings); | |
723 | SET_VALID_IOCTL(ops, VIDIOC_ENUM_DV_TIMINGS, vidioc_enum_dv_timings); | |
4b20259f | 724 | SET_VALID_IOCTL(ops, VIDIOC_DV_TIMINGS_CAP, vidioc_dv_timings_cap); |
dd519bb3 | 725 | SET_VALID_IOCTL(ops, VIDIOC_G_EDID, vidioc_g_edid); |
4b20259f | 726 | } |
bfffd743 HV |
727 | if (is_tx && (is_radio || is_sdr)) { |
728 | /* radio transmitter only ioctls */ | |
90d0fc49 HV |
729 | SET_VALID_IOCTL(ops, VIDIOC_G_MODULATOR, vidioc_g_modulator); |
730 | SET_VALID_IOCTL(ops, VIDIOC_S_MODULATOR, vidioc_s_modulator); | |
731 | } | |
732 | if (is_rx) { | |
733 | /* receiver only ioctls */ | |
734 | SET_VALID_IOCTL(ops, VIDIOC_G_TUNER, vidioc_g_tuner); | |
735 | SET_VALID_IOCTL(ops, VIDIOC_S_TUNER, vidioc_s_tuner); | |
736 | SET_VALID_IOCTL(ops, VIDIOC_S_HW_FREQ_SEEK, vidioc_s_hw_freq_seek); | |
737 | } | |
738 | ||
48ea0be0 HV |
739 | bitmap_andnot(vdev->valid_ioctls, valid_ioctls, vdev->valid_ioctls, |
740 | BASE_VIDIOC_PRIVATE); | |
741 | } | |
742 | ||
27a5e6d3 | 743 | /** |
2096a5dc | 744 | * __video_register_device - register video4linux devices |
dc93a70c | 745 | * @vdev: video device structure we want to register |
27a5e6d3 | 746 | * @type: type of device to register |
22e22125 | 747 | * @nr: which device node number (0 == /dev/video0, 1 == /dev/video1, ... |
27a5e6d3 | 748 | * -1 == first free) |
6b5270d2 HV |
749 | * @warn_if_nr_in_use: warn if the desired device node number |
750 | * was already in use and another number was chosen instead. | |
2096a5dc | 751 | * @owner: module that owns the video device node |
27a5e6d3 | 752 | * |
22e22125 HV |
753 | * The registration code assigns minor numbers and device node numbers |
754 | * based on the requested type and registers the new device node with | |
755 | * the kernel. | |
46b63377 HV |
756 | * |
757 | * This function assumes that struct video_device was zeroed when it | |
758 | * was allocated and does not contain any stale date. | |
759 | * | |
22e22125 HV |
760 | * An error is returned if no free minor or device node number could be |
761 | * found, or if the registration of the device node failed. | |
27a5e6d3 HV |
762 | * |
763 | * Zero is returned on success. | |
764 | * | |
765 | * Valid types are | |
766 | * | |
767 | * %VFL_TYPE_GRABBER - A frame grabber | |
768 | * | |
27a5e6d3 HV |
769 | * %VFL_TYPE_VBI - Vertical blank data (undecoded) |
770 | * | |
771 | * %VFL_TYPE_RADIO - A radio card | |
2096a5dc LP |
772 | * |
773 | * %VFL_TYPE_SUBDEV - A subdevice | |
d42626bd AP |
774 | * |
775 | * %VFL_TYPE_SDR - Software Defined Radio | |
27a5e6d3 | 776 | */ |
2096a5dc LP |
777 | int __video_register_device(struct video_device *vdev, int type, int nr, |
778 | int warn_if_nr_in_use, struct module *owner) | |
27a5e6d3 HV |
779 | { |
780 | int i = 0; | |
27a5e6d3 | 781 | int ret; |
dd89601d HV |
782 | int minor_offset = 0; |
783 | int minor_cnt = VIDEO_NUM_DEVICES; | |
784 | const char *name_base; | |
27a5e6d3 | 785 | |
dc93a70c HV |
786 | /* A minor value of -1 marks this video device as never |
787 | having been registered */ | |
428c8d19 | 788 | vdev->minor = -1; |
ee7aa9f8 | 789 | |
dc93a70c | 790 | /* the release callback MUST be present */ |
1fc2b5f7 | 791 | if (WARN_ON(!vdev->release)) |
f3b9f50e | 792 | return -EINVAL; |
1c1d86a1 HV |
793 | /* the v4l2_dev pointer MUST be present */ |
794 | if (WARN_ON(!vdev->v4l2_dev)) | |
795 | return -EINVAL; | |
f3b9f50e | 796 | |
1babcb46 SA |
797 | /* v4l2_fh support */ |
798 | spin_lock_init(&vdev->fh_lock); | |
799 | INIT_LIST_HEAD(&vdev->fh_list); | |
800 | ||
dc93a70c | 801 | /* Part 1: check device type */ |
27a5e6d3 HV |
802 | switch (type) { |
803 | case VFL_TYPE_GRABBER: | |
27a5e6d3 HV |
804 | name_base = "video"; |
805 | break; | |
27a5e6d3 | 806 | case VFL_TYPE_VBI: |
27a5e6d3 HV |
807 | name_base = "vbi"; |
808 | break; | |
809 | case VFL_TYPE_RADIO: | |
27a5e6d3 HV |
810 | name_base = "radio"; |
811 | break; | |
2096a5dc LP |
812 | case VFL_TYPE_SUBDEV: |
813 | name_base = "v4l-subdev"; | |
814 | break; | |
d42626bd AP |
815 | case VFL_TYPE_SDR: |
816 | /* Use device name 'swradio' because 'sdr' was already taken. */ | |
817 | name_base = "swradio"; | |
818 | break; | |
27a5e6d3 HV |
819 | default: |
820 | printk(KERN_ERR "%s called with unknown type: %d\n", | |
821 | __func__, type); | |
46f2c21c | 822 | return -EINVAL; |
27a5e6d3 HV |
823 | } |
824 | ||
dc93a70c HV |
825 | vdev->vfl_type = type; |
826 | vdev->cdev = NULL; | |
1c1d86a1 HV |
827 | if (vdev->dev_parent == NULL) |
828 | vdev->dev_parent = vdev->v4l2_dev->dev; | |
829 | if (vdev->ctrl_handler == NULL) | |
830 | vdev->ctrl_handler = vdev->v4l2_dev->ctrl_handler; | |
831 | /* If the prio state pointer is NULL, then use the v4l2_device | |
832 | prio state. */ | |
833 | if (vdev->prio == NULL) | |
834 | vdev->prio = &vdev->v4l2_dev->prio; | |
dd89601d | 835 | |
22e22125 | 836 | /* Part 2: find a free minor, device node number and device index. */ |
dd89601d HV |
837 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES |
838 | /* Keep the ranges for the first four types for historical | |
839 | * reasons. | |
840 | * Newer devices (not yet in place) should use the range | |
841 | * of 128-191 and just pick the first free minor there | |
842 | * (new style). */ | |
843 | switch (type) { | |
844 | case VFL_TYPE_GRABBER: | |
845 | minor_offset = 0; | |
846 | minor_cnt = 64; | |
847 | break; | |
848 | case VFL_TYPE_RADIO: | |
849 | minor_offset = 64; | |
850 | minor_cnt = 64; | |
851 | break; | |
dd89601d HV |
852 | case VFL_TYPE_VBI: |
853 | minor_offset = 224; | |
854 | minor_cnt = 32; | |
855 | break; | |
856 | default: | |
857 | minor_offset = 128; | |
858 | minor_cnt = 64; | |
859 | break; | |
860 | } | |
861 | #endif | |
862 | ||
22e22125 | 863 | /* Pick a device node number */ |
27a5e6d3 | 864 | mutex_lock(&videodev_lock); |
5062cb70 | 865 | nr = devnode_find(vdev, nr == -1 ? 0 : nr, minor_cnt); |
dd89601d | 866 | if (nr == minor_cnt) |
5062cb70 | 867 | nr = devnode_find(vdev, 0, minor_cnt); |
dd89601d | 868 | if (nr == minor_cnt) { |
22e22125 | 869 | printk(KERN_ERR "could not get a free device node number\n"); |
dd89601d HV |
870 | mutex_unlock(&videodev_lock); |
871 | return -ENFILE; | |
27a5e6d3 | 872 | } |
dd89601d | 873 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES |
22e22125 | 874 | /* 1-on-1 mapping of device node number to minor number */ |
dd89601d HV |
875 | i = nr; |
876 | #else | |
22e22125 HV |
877 | /* The device node number and minor numbers are independent, so |
878 | we just find the first free minor number. */ | |
dd89601d HV |
879 | for (i = 0; i < VIDEO_NUM_DEVICES; i++) |
880 | if (video_device[i] == NULL) | |
881 | break; | |
882 | if (i == VIDEO_NUM_DEVICES) { | |
883 | mutex_unlock(&videodev_lock); | |
884 | printk(KERN_ERR "could not get a free minor\n"); | |
885 | return -ENFILE; | |
886 | } | |
887 | #endif | |
dc93a70c HV |
888 | vdev->minor = i + minor_offset; |
889 | vdev->num = nr; | |
5062cb70 HV |
890 | devnode_set(vdev); |
891 | ||
dc93a70c HV |
892 | /* Should not happen since we thought this minor was free */ |
893 | WARN_ON(video_device[vdev->minor] != NULL); | |
7ae0cd9b | 894 | vdev->index = get_index(vdev); |
6c3df5da | 895 | video_device[vdev->minor] = vdev; |
27a5e6d3 HV |
896 | mutex_unlock(&videodev_lock); |
897 | ||
48ea0be0 HV |
898 | if (vdev->ioctl_ops) |
899 | determine_valid_ioctls(vdev); | |
900 | ||
dc93a70c HV |
901 | /* Part 3: Initialize the character device */ |
902 | vdev->cdev = cdev_alloc(); | |
903 | if (vdev->cdev == NULL) { | |
904 | ret = -ENOMEM; | |
905 | goto cleanup; | |
906 | } | |
86a5ef7d | 907 | vdev->cdev->ops = &v4l2_fops; |
2096a5dc | 908 | vdev->cdev->owner = owner; |
dc93a70c | 909 | ret = cdev_add(vdev->cdev, MKDEV(VIDEO_MAJOR, vdev->minor), 1); |
7f8ecfab HV |
910 | if (ret < 0) { |
911 | printk(KERN_ERR "%s: cdev_add failed\n", __func__); | |
dc93a70c HV |
912 | kfree(vdev->cdev); |
913 | vdev->cdev = NULL; | |
914 | goto cleanup; | |
7f8ecfab | 915 | } |
dc93a70c HV |
916 | |
917 | /* Part 4: register the device with sysfs */ | |
dc93a70c HV |
918 | vdev->dev.class = &video_class; |
919 | vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor); | |
1c1d86a1 | 920 | vdev->dev.parent = vdev->dev_parent; |
22e22125 | 921 | dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num); |
dc93a70c | 922 | ret = device_register(&vdev->dev); |
27a5e6d3 HV |
923 | if (ret < 0) { |
924 | printk(KERN_ERR "%s: device_register failed\n", __func__); | |
dc93a70c | 925 | goto cleanup; |
27a5e6d3 | 926 | } |
dc93a70c HV |
927 | /* Register the release callback that will be called when the last |
928 | reference to the device goes away. */ | |
929 | vdev->dev.release = v4l2_device_release; | |
27a5e6d3 | 930 | |
6b5270d2 | 931 | if (nr != -1 && nr != vdev->num && warn_if_nr_in_use) |
eac8ea53 LP |
932 | printk(KERN_WARNING "%s: requested %s%d, got %s\n", __func__, |
933 | name_base, nr, video_device_node_name(vdev)); | |
bedf8bcf HV |
934 | |
935 | /* Increase v4l2_device refcount */ | |
d9bfbcc0 | 936 | v4l2_device_get(vdev->v4l2_dev); |
bedf8bcf | 937 | |
2c0ab67b LP |
938 | #if defined(CONFIG_MEDIA_CONTROLLER) |
939 | /* Part 5: Register the entity. */ | |
d9bfbcc0 | 940 | if (vdev->v4l2_dev->mdev && |
c4f0b78a | 941 | vdev->vfl_type != VFL_TYPE_SUBDEV) { |
2c0ab67b LP |
942 | vdev->entity.type = MEDIA_ENT_T_DEVNODE_V4L; |
943 | vdev->entity.name = vdev->name; | |
fa5034c6 CL |
944 | vdev->entity.info.v4l.major = VIDEO_MAJOR; |
945 | vdev->entity.info.v4l.minor = vdev->minor; | |
2c0ab67b LP |
946 | ret = media_device_register_entity(vdev->v4l2_dev->mdev, |
947 | &vdev->entity); | |
948 | if (ret < 0) | |
949 | printk(KERN_WARNING | |
950 | "%s: media_device_register_entity failed\n", | |
951 | __func__); | |
952 | } | |
953 | #endif | |
954 | /* Part 6: Activate this minor. The char device can now be used. */ | |
957b4aa9 | 955 | set_bit(V4L2_FL_REGISTERED, &vdev->flags); |
2c0ab67b | 956 | |
dc93a70c | 957 | return 0; |
7f8ecfab | 958 | |
dc93a70c | 959 | cleanup: |
27a5e6d3 | 960 | mutex_lock(&videodev_lock); |
dc93a70c HV |
961 | if (vdev->cdev) |
962 | cdev_del(vdev->cdev); | |
1056e438 | 963 | video_device[vdev->minor] = NULL; |
5062cb70 | 964 | devnode_clear(vdev); |
27a5e6d3 | 965 | mutex_unlock(&videodev_lock); |
dc93a70c HV |
966 | /* Mark this video device as never having been registered. */ |
967 | vdev->minor = -1; | |
27a5e6d3 HV |
968 | return ret; |
969 | } | |
2096a5dc | 970 | EXPORT_SYMBOL(__video_register_device); |
6b5270d2 | 971 | |
27a5e6d3 HV |
972 | /** |
973 | * video_unregister_device - unregister a video4linux device | |
dc93a70c | 974 | * @vdev: the device to unregister |
27a5e6d3 | 975 | * |
dc93a70c HV |
976 | * This unregisters the passed device. Future open calls will |
977 | * be met with errors. | |
27a5e6d3 | 978 | */ |
dc93a70c | 979 | void video_unregister_device(struct video_device *vdev) |
27a5e6d3 | 980 | { |
dc93a70c | 981 | /* Check if vdev was ever registered at all */ |
957b4aa9 | 982 | if (!vdev || !video_is_registered(vdev)) |
dc93a70c HV |
983 | return; |
984 | ||
ca9afe6f HV |
985 | mutex_lock(&videodev_lock); |
986 | /* This must be in a critical section to prevent a race with v4l2_open. | |
987 | * Once this bit has been cleared video_get may never be called again. | |
988 | */ | |
957b4aa9 | 989 | clear_bit(V4L2_FL_REGISTERED, &vdev->flags); |
ca9afe6f | 990 | mutex_unlock(&videodev_lock); |
dc93a70c | 991 | device_unregister(&vdev->dev); |
27a5e6d3 HV |
992 | } |
993 | EXPORT_SYMBOL(video_unregister_device); | |
994 | ||
27a5e6d3 HV |
995 | /* |
996 | * Initialise video for linux | |
997 | */ | |
27a5e6d3 HV |
998 | static int __init videodev_init(void) |
999 | { | |
7f8ecfab | 1000 | dev_t dev = MKDEV(VIDEO_MAJOR, 0); |
27a5e6d3 HV |
1001 | int ret; |
1002 | ||
1003 | printk(KERN_INFO "Linux video capture interface: v2.00\n"); | |
7f8ecfab HV |
1004 | ret = register_chrdev_region(dev, VIDEO_NUM_DEVICES, VIDEO_NAME); |
1005 | if (ret < 0) { | |
1006 | printk(KERN_WARNING "videodev: unable to get major %d\n", | |
1007 | VIDEO_MAJOR); | |
1008 | return ret; | |
27a5e6d3 HV |
1009 | } |
1010 | ||
1011 | ret = class_register(&video_class); | |
1012 | if (ret < 0) { | |
7f8ecfab | 1013 | unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); |
27a5e6d3 HV |
1014 | printk(KERN_WARNING "video_dev: class_register failed\n"); |
1015 | return -EIO; | |
1016 | } | |
1017 | ||
1018 | return 0; | |
1019 | } | |
1020 | ||
1021 | static void __exit videodev_exit(void) | |
1022 | { | |
7f8ecfab HV |
1023 | dev_t dev = MKDEV(VIDEO_MAJOR, 0); |
1024 | ||
27a5e6d3 | 1025 | class_unregister(&video_class); |
7f8ecfab | 1026 | unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); |
27a5e6d3 HV |
1027 | } |
1028 | ||
ee981c6f | 1029 | subsys_initcall(videodev_init); |
27a5e6d3 HV |
1030 | module_exit(videodev_exit) |
1031 | ||
1032 | MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@infradead.org>"); | |
1033 | MODULE_DESCRIPTION("Device registrar for Video4Linux drivers v2"); | |
1034 | MODULE_LICENSE("GPL"); | |
cbb72b0f | 1035 | MODULE_ALIAS_CHARDEV_MAJOR(VIDEO_MAJOR); |