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 | |
17028cdb | 50 | static ssize_t dev_debug_show(struct device *cd, |
13e2237f | 51 | struct device_attribute *attr, char *buf) |
80131fe0 HV |
52 | { |
53 | struct video_device *vdev = to_video_device(cd); | |
54 | ||
17028cdb | 55 | return sprintf(buf, "%i\n", vdev->dev_debug); |
80131fe0 HV |
56 | } |
57 | ||
17028cdb | 58 | static ssize_t dev_debug_store(struct device *cd, struct device_attribute *attr, |
13e2237f | 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 | ||
17028cdb | 69 | vdev->dev_debug = value; |
80131fe0 HV |
70 | return len; |
71 | } | |
17028cdb | 72 | static DEVICE_ATTR_RW(dev_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, | |
17028cdb | 85 | &dev_attr_dev_debug.attr, |
13e2237f GKH |
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); | |
17028cdb HV |
307 | if ((vdev->dev_debug & V4L2_DEV_DEBUG_FOP) && |
308 | (vdev->dev_debug & V4L2_DEV_DEBUG_STREAMING)) | |
cc4b7e7f HV |
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; | |
ee6869af HV |
322 | if (video_is_registered(vdev)) |
323 | ret = vdev->fops->write(filp, buf, sz, off); | |
17028cdb HV |
324 | if ((vdev->dev_debug & V4L2_DEV_DEBUG_FOP) && |
325 | (vdev->dev_debug & V4L2_DEV_DEBUG_STREAMING)) | |
cc4b7e7f HV |
326 | printk(KERN_DEBUG "%s: write: %zd (%d)\n", |
327 | video_device_node_name(vdev), sz, ret); | |
ee6869af | 328 | return ret; |
dc93a70c HV |
329 | } |
330 | ||
331 | static unsigned int v4l2_poll(struct file *filp, struct poll_table_struct *poll) | |
332 | { | |
333 | struct video_device *vdev = video_devdata(filp); | |
cf533735 | 334 | unsigned int res = POLLERR | POLLHUP; |
ee6869af HV |
335 | |
336 | if (!vdev->fops->poll) | |
2877842d | 337 | return DEFAULT_POLLMASK; |
ee6869af | 338 | if (video_is_registered(vdev)) |
cf533735 | 339 | res = vdev->fops->poll(filp, poll); |
17028cdb | 340 | if (vdev->dev_debug & V4L2_DEV_DEBUG_POLL) |
cc4b7e7f | 341 | printk(KERN_DEBUG "%s: poll: %08x\n", |
cf533735 HV |
342 | video_device_node_name(vdev), res); |
343 | return res; | |
dc93a70c HV |
344 | } |
345 | ||
86a5ef7d | 346 | static long v4l2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
dc93a70c HV |
347 | { |
348 | struct video_device *vdev = video_devdata(filp); | |
72420630 | 349 | int ret = -ENODEV; |
dc93a70c | 350 | |
86a5ef7d | 351 | if (vdev->fops->unlocked_ioctl) { |
5a5adf6b | 352 | struct mutex *lock = v4l2_ioctl_get_lock(vdev, cmd); |
8ab75e3e | 353 | |
5a5adf6b HV |
354 | if (lock && mutex_lock_interruptible(lock)) |
355 | return -ERESTARTSYS; | |
72420630 MCC |
356 | if (video_is_registered(vdev)) |
357 | ret = vdev->fops->unlocked_ioctl(filp, cmd, arg); | |
5a5adf6b HV |
358 | if (lock) |
359 | mutex_unlock(lock); | |
86a5ef7d | 360 | } else if (vdev->fops->ioctl) { |
879aa24d HV |
361 | /* This code path is a replacement for the BKL. It is a major |
362 | * hack but it will have to do for those drivers that are not | |
363 | * yet converted to use unlocked_ioctl. | |
364 | * | |
d9bfbcc0 HV |
365 | * All drivers implement struct v4l2_device, so we use the |
366 | * lock defined there to serialize the ioctls. | |
879aa24d | 367 | * |
d9bfbcc0 HV |
368 | * However, if the driver sleeps, then it blocks all ioctls |
369 | * since the lock is still held. This is very common for | |
370 | * VIDIOC_DQBUF since that normally waits for a frame to arrive. | |
371 | * As a result any other ioctl calls will proceed very, very | |
372 | * slowly since each call will have to wait for the VIDIOC_QBUF | |
373 | * to finish. Things that should take 0.01s may now take 10-20 | |
374 | * seconds. | |
879aa24d HV |
375 | * |
376 | * The workaround is to *not* take the lock for VIDIOC_DQBUF. | |
377 | * This actually works OK for videobuf-based drivers, since | |
378 | * videobuf will take its own internal lock. | |
379 | */ | |
d9bfbcc0 | 380 | struct mutex *m = &vdev->v4l2_dev->ioctl_lock; |
0edf2e5e | 381 | |
879aa24d HV |
382 | if (cmd != VIDIOC_DQBUF && mutex_lock_interruptible(m)) |
383 | return -ERESTARTSYS; | |
72420630 MCC |
384 | if (video_is_registered(vdev)) |
385 | ret = vdev->fops->ioctl(filp, cmd, arg); | |
879aa24d HV |
386 | if (cmd != VIDIOC_DQBUF) |
387 | mutex_unlock(m); | |
86a5ef7d AB |
388 | } else |
389 | ret = -ENOTTY; | |
dc93a70c | 390 | |
86a5ef7d | 391 | return ret; |
dc93a70c HV |
392 | } |
393 | ||
ecc6517d BL |
394 | #ifdef CONFIG_MMU |
395 | #define v4l2_get_unmapped_area NULL | |
396 | #else | |
397 | static unsigned long v4l2_get_unmapped_area(struct file *filp, | |
398 | unsigned long addr, unsigned long len, unsigned long pgoff, | |
399 | unsigned long flags) | |
400 | { | |
401 | struct video_device *vdev = video_devdata(filp); | |
cc4b7e7f | 402 | int ret; |
ecc6517d BL |
403 | |
404 | if (!vdev->fops->get_unmapped_area) | |
405 | return -ENOSYS; | |
406 | if (!video_is_registered(vdev)) | |
407 | return -ENODEV; | |
cc4b7e7f | 408 | ret = vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags); |
17028cdb | 409 | if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP) |
cc4b7e7f HV |
410 | printk(KERN_DEBUG "%s: get_unmapped_area (%d)\n", |
411 | video_device_node_name(vdev), ret); | |
412 | return ret; | |
ecc6517d BL |
413 | } |
414 | #endif | |
415 | ||
dc93a70c HV |
416 | static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm) |
417 | { | |
418 | struct video_device *vdev = video_devdata(filp); | |
ee6869af HV |
419 | int ret = -ENODEV; |
420 | ||
421 | if (!vdev->fops->mmap) | |
cf533735 | 422 | return -ENODEV; |
ee6869af HV |
423 | if (video_is_registered(vdev)) |
424 | ret = vdev->fops->mmap(filp, vm); | |
17028cdb | 425 | if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP) |
cc4b7e7f HV |
426 | printk(KERN_DEBUG "%s: mmap (%d)\n", |
427 | video_device_node_name(vdev), ret); | |
ee6869af | 428 | return ret; |
dc93a70c HV |
429 | } |
430 | ||
431 | /* Override for the open function */ | |
432 | static int v4l2_open(struct inode *inode, struct file *filp) | |
433 | { | |
434 | struct video_device *vdev; | |
65d9ff9c | 435 | int ret = 0; |
dc93a70c HV |
436 | |
437 | /* Check if the video device is available */ | |
438 | mutex_lock(&videodev_lock); | |
439 | vdev = video_devdata(filp); | |
ee6869af | 440 | /* return ENODEV if the video device has already been removed. */ |
ca9afe6f | 441 | if (vdev == NULL || !video_is_registered(vdev)) { |
dc93a70c HV |
442 | mutex_unlock(&videodev_lock); |
443 | return -ENODEV; | |
444 | } | |
445 | /* and increase the device refcount */ | |
446 | video_get(vdev); | |
447 | mutex_unlock(&videodev_lock); | |
ee6869af | 448 | if (vdev->fops->open) { |
ee6869af HV |
449 | if (video_is_registered(vdev)) |
450 | ret = vdev->fops->open(filp); | |
451 | else | |
452 | ret = -ENODEV; | |
ee6869af | 453 | } |
65d9ff9c | 454 | |
17028cdb | 455 | if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP) |
cc4b7e7f HV |
456 | printk(KERN_DEBUG "%s: open (%d)\n", |
457 | video_device_node_name(vdev), ret); | |
8f695d3f EG |
458 | /* decrease the refcount in case of an error */ |
459 | if (ret) | |
460 | video_put(vdev); | |
dc93a70c HV |
461 | return ret; |
462 | } | |
463 | ||
464 | /* Override for the release function */ | |
465 | static int v4l2_release(struct inode *inode, struct file *filp) | |
466 | { | |
467 | struct video_device *vdev = video_devdata(filp); | |
65d9ff9c HV |
468 | int ret = 0; |
469 | ||
cf533735 HV |
470 | if (vdev->fops->release) |
471 | ret = vdev->fops->release(filp); | |
17028cdb | 472 | if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP) |
cc4b7e7f HV |
473 | printk(KERN_DEBUG "%s: release\n", |
474 | video_device_node_name(vdev)); | |
cf533735 | 475 | |
8f695d3f EG |
476 | /* decrease the refcount unconditionally since the release() |
477 | return value is ignored. */ | |
478 | video_put(vdev); | |
dc93a70c HV |
479 | return ret; |
480 | } | |
481 | ||
dc93a70c HV |
482 | static const struct file_operations v4l2_fops = { |
483 | .owner = THIS_MODULE, | |
484 | .read = v4l2_read, | |
485 | .write = v4l2_write, | |
486 | .open = v4l2_open, | |
ecc6517d | 487 | .get_unmapped_area = v4l2_get_unmapped_area, |
dc93a70c | 488 | .mmap = v4l2_mmap, |
86a5ef7d | 489 | .unlocked_ioctl = v4l2_ioctl, |
dc93a70c | 490 | #ifdef CONFIG_COMPAT |
9bb7cde7 | 491 | .compat_ioctl = v4l2_compat_ioctl32, |
dc93a70c HV |
492 | #endif |
493 | .release = v4l2_release, | |
494 | .poll = v4l2_poll, | |
495 | .llseek = no_llseek, | |
496 | }; | |
497 | ||
27a5e6d3 | 498 | /** |
1c1d86a1 HV |
499 | * get_index - assign stream index number based on v4l2_dev |
500 | * @vdev: video_device to assign index number to, vdev->v4l2_dev should be assigned | |
27a5e6d3 | 501 | * |
dc93a70c | 502 | * Note that when this is called the new device has not yet been registered |
7ae0cd9b | 503 | * in the video_device array, but it was able to obtain a minor number. |
27a5e6d3 | 504 | * |
7ae0cd9b HV |
505 | * This means that we can always obtain a free stream index number since |
506 | * the worst case scenario is that there are VIDEO_NUM_DEVICES - 1 slots in | |
507 | * use of the video_device array. | |
508 | * | |
509 | * Returns a free index number. | |
27a5e6d3 | 510 | */ |
7ae0cd9b | 511 | static int get_index(struct video_device *vdev) |
27a5e6d3 | 512 | { |
775a05dd HV |
513 | /* This can be static since this function is called with the global |
514 | videodev_lock held. */ | |
515 | static DECLARE_BITMAP(used, VIDEO_NUM_DEVICES); | |
27a5e6d3 HV |
516 | int i; |
517 | ||
775a05dd | 518 | bitmap_zero(used, VIDEO_NUM_DEVICES); |
806e5b7c | 519 | |
27a5e6d3 HV |
520 | for (i = 0; i < VIDEO_NUM_DEVICES; i++) { |
521 | if (video_device[i] != NULL && | |
1c1d86a1 | 522 | video_device[i]->v4l2_dev == vdev->v4l2_dev) { |
775a05dd | 523 | set_bit(video_device[i]->index, used); |
27a5e6d3 HV |
524 | } |
525 | } | |
526 | ||
7ae0cd9b | 527 | return find_first_zero_bit(used, VIDEO_NUM_DEVICES); |
27a5e6d3 HV |
528 | } |
529 | ||
48ea0be0 HV |
530 | #define SET_VALID_IOCTL(ops, cmd, op) \ |
531 | if (ops->op) \ | |
532 | set_bit(_IOC_NR(cmd), valid_ioctls) | |
533 | ||
534 | /* This determines which ioctls are actually implemented in the driver. | |
535 | It's a one-time thing which simplifies video_ioctl2 as it can just do | |
536 | a bit test. | |
537 | ||
538 | Note that drivers can override this by setting bits to 1 in | |
539 | vdev->valid_ioctls. If an ioctl is marked as 1 when this function is | |
540 | called, then that ioctl will actually be marked as unimplemented. | |
541 | ||
542 | It does that by first setting up the local valid_ioctls bitmap, and | |
543 | at the end do a: | |
544 | ||
545 | vdev->valid_ioctls = valid_ioctls & ~(vdev->valid_ioctls) | |
546 | */ | |
547 | static void determine_valid_ioctls(struct video_device *vdev) | |
548 | { | |
549 | DECLARE_BITMAP(valid_ioctls, BASE_VIDIOC_PRIVATE); | |
550 | const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops; | |
4b20259f HV |
551 | bool is_vid = vdev->vfl_type == VFL_TYPE_GRABBER; |
552 | bool is_vbi = vdev->vfl_type == VFL_TYPE_VBI; | |
bfffd743 | 553 | bool is_radio = vdev->vfl_type == VFL_TYPE_RADIO; |
582c52cb | 554 | bool is_sdr = vdev->vfl_type == VFL_TYPE_SDR; |
4b20259f HV |
555 | bool is_rx = vdev->vfl_dir != VFL_DIR_TX; |
556 | bool is_tx = vdev->vfl_dir != VFL_DIR_RX; | |
48ea0be0 HV |
557 | |
558 | bitmap_zero(valid_ioctls, BASE_VIDIOC_PRIVATE); | |
559 | ||
90d0fc49 HV |
560 | /* vfl_type and vfl_dir independent ioctls */ |
561 | ||
48ea0be0 | 562 | SET_VALID_IOCTL(ops, VIDIOC_QUERYCAP, vidioc_querycap); |
b7284bb0 | 563 | if (ops->vidioc_g_priority) |
48ea0be0 | 564 | set_bit(_IOC_NR(VIDIOC_G_PRIORITY), valid_ioctls); |
b7284bb0 | 565 | if (ops->vidioc_s_priority) |
48ea0be0 | 566 | set_bit(_IOC_NR(VIDIOC_S_PRIORITY), valid_ioctls); |
90d0fc49 HV |
567 | /* Note: the control handler can also be passed through the filehandle, |
568 | and that can't be tested here. If the bit for these control ioctls | |
569 | is set, then the ioctl is valid. But if it is 0, then it can still | |
570 | be valid if the filehandle passed the control handler. */ | |
571 | if (vdev->ctrl_handler || ops->vidioc_queryctrl) | |
572 | set_bit(_IOC_NR(VIDIOC_QUERYCTRL), valid_ioctls); | |
e6bee368 HV |
573 | if (vdev->ctrl_handler || ops->vidioc_query_ext_ctrl) |
574 | set_bit(_IOC_NR(VIDIOC_QUERY_EXT_CTRL), valid_ioctls); | |
90d0fc49 HV |
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); |
582c52cb AP |
661 | } else if (is_sdr) { |
662 | /* SDR specific ioctls */ | |
663 | if (ops->vidioc_enum_fmt_sdr_cap) | |
664 | set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls); | |
665 | if (ops->vidioc_g_fmt_sdr_cap) | |
666 | set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); | |
667 | if (ops->vidioc_s_fmt_sdr_cap) | |
668 | set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); | |
669 | if (ops->vidioc_try_fmt_sdr_cap) | |
670 | set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); | |
4b20259f | 671 | } |
582c52cb AP |
672 | |
673 | if (is_vid || is_vbi || is_sdr) { | |
674 | /* ioctls valid for video, vbi or sdr */ | |
5815d0c4 FS |
675 | SET_VALID_IOCTL(ops, VIDIOC_REQBUFS, vidioc_reqbufs); |
676 | SET_VALID_IOCTL(ops, VIDIOC_QUERYBUF, vidioc_querybuf); | |
677 | SET_VALID_IOCTL(ops, VIDIOC_QBUF, vidioc_qbuf); | |
678 | SET_VALID_IOCTL(ops, VIDIOC_EXPBUF, vidioc_expbuf); | |
679 | SET_VALID_IOCTL(ops, VIDIOC_DQBUF, vidioc_dqbuf); | |
680 | SET_VALID_IOCTL(ops, VIDIOC_CREATE_BUFS, vidioc_create_bufs); | |
681 | SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, vidioc_prepare_buf); | |
72be89c8 HV |
682 | SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon); |
683 | SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff); | |
582c52cb AP |
684 | } |
685 | ||
686 | if (is_vid || is_vbi) { | |
687 | /* ioctls valid for video or vbi */ | |
4b20259f HV |
688 | if (ops->vidioc_s_std) |
689 | set_bit(_IOC_NR(VIDIOC_ENUMSTD), valid_ioctls); | |
4b20259f | 690 | SET_VALID_IOCTL(ops, VIDIOC_S_STD, vidioc_s_std); |
ca371575 | 691 | SET_VALID_IOCTL(ops, VIDIOC_G_STD, vidioc_g_std); |
4b20259f | 692 | if (is_rx) { |
90d0fc49 | 693 | SET_VALID_IOCTL(ops, VIDIOC_QUERYSTD, vidioc_querystd); |
4b20259f HV |
694 | SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input); |
695 | SET_VALID_IOCTL(ops, VIDIOC_G_INPUT, vidioc_g_input); | |
696 | SET_VALID_IOCTL(ops, VIDIOC_S_INPUT, vidioc_s_input); | |
697 | SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDIO, vidioc_enumaudio); | |
698 | SET_VALID_IOCTL(ops, VIDIOC_G_AUDIO, vidioc_g_audio); | |
699 | SET_VALID_IOCTL(ops, VIDIOC_S_AUDIO, vidioc_s_audio); | |
90d0fc49 | 700 | SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings); |
dd519bb3 | 701 | SET_VALID_IOCTL(ops, VIDIOC_S_EDID, vidioc_s_edid); |
4b20259f HV |
702 | } |
703 | if (is_tx) { | |
704 | SET_VALID_IOCTL(ops, VIDIOC_ENUMOUTPUT, vidioc_enum_output); | |
705 | SET_VALID_IOCTL(ops, VIDIOC_G_OUTPUT, vidioc_g_output); | |
706 | SET_VALID_IOCTL(ops, VIDIOC_S_OUTPUT, vidioc_s_output); | |
707 | SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDOUT, vidioc_enumaudout); | |
708 | SET_VALID_IOCTL(ops, VIDIOC_G_AUDOUT, vidioc_g_audout); | |
709 | SET_VALID_IOCTL(ops, VIDIOC_S_AUDOUT, vidioc_s_audout); | |
710 | } | |
4b20259f HV |
711 | if (ops->vidioc_g_crop || ops->vidioc_g_selection) |
712 | set_bit(_IOC_NR(VIDIOC_G_CROP), valid_ioctls); | |
713 | if (ops->vidioc_s_crop || ops->vidioc_s_selection) | |
714 | set_bit(_IOC_NR(VIDIOC_S_CROP), valid_ioctls); | |
715 | SET_VALID_IOCTL(ops, VIDIOC_G_SELECTION, vidioc_g_selection); | |
716 | SET_VALID_IOCTL(ops, VIDIOC_S_SELECTION, vidioc_s_selection); | |
717 | if (ops->vidioc_cropcap || ops->vidioc_g_selection) | |
718 | set_bit(_IOC_NR(VIDIOC_CROPCAP), valid_ioctls); | |
4b20259f | 719 | if (ops->vidioc_g_parm || (vdev->vfl_type == VFL_TYPE_GRABBER && |
ca371575 | 720 | ops->vidioc_g_std)) |
4b20259f HV |
721 | set_bit(_IOC_NR(VIDIOC_G_PARM), valid_ioctls); |
722 | SET_VALID_IOCTL(ops, VIDIOC_S_PARM, vidioc_s_parm); | |
4b20259f HV |
723 | SET_VALID_IOCTL(ops, VIDIOC_S_DV_TIMINGS, vidioc_s_dv_timings); |
724 | SET_VALID_IOCTL(ops, VIDIOC_G_DV_TIMINGS, vidioc_g_dv_timings); | |
725 | SET_VALID_IOCTL(ops, VIDIOC_ENUM_DV_TIMINGS, vidioc_enum_dv_timings); | |
4b20259f | 726 | SET_VALID_IOCTL(ops, VIDIOC_DV_TIMINGS_CAP, vidioc_dv_timings_cap); |
dd519bb3 | 727 | SET_VALID_IOCTL(ops, VIDIOC_G_EDID, vidioc_g_edid); |
4b20259f | 728 | } |
bfffd743 HV |
729 | if (is_tx && (is_radio || is_sdr)) { |
730 | /* radio transmitter only ioctls */ | |
90d0fc49 HV |
731 | SET_VALID_IOCTL(ops, VIDIOC_G_MODULATOR, vidioc_g_modulator); |
732 | SET_VALID_IOCTL(ops, VIDIOC_S_MODULATOR, vidioc_s_modulator); | |
733 | } | |
734 | if (is_rx) { | |
735 | /* receiver only ioctls */ | |
736 | SET_VALID_IOCTL(ops, VIDIOC_G_TUNER, vidioc_g_tuner); | |
737 | SET_VALID_IOCTL(ops, VIDIOC_S_TUNER, vidioc_s_tuner); | |
738 | SET_VALID_IOCTL(ops, VIDIOC_S_HW_FREQ_SEEK, vidioc_s_hw_freq_seek); | |
739 | } | |
740 | ||
48ea0be0 HV |
741 | bitmap_andnot(vdev->valid_ioctls, valid_ioctls, vdev->valid_ioctls, |
742 | BASE_VIDIOC_PRIVATE); | |
743 | } | |
744 | ||
27a5e6d3 | 745 | /** |
2096a5dc | 746 | * __video_register_device - register video4linux devices |
dc93a70c | 747 | * @vdev: video device structure we want to register |
27a5e6d3 | 748 | * @type: type of device to register |
22e22125 | 749 | * @nr: which device node number (0 == /dev/video0, 1 == /dev/video1, ... |
27a5e6d3 | 750 | * -1 == first free) |
6b5270d2 HV |
751 | * @warn_if_nr_in_use: warn if the desired device node number |
752 | * was already in use and another number was chosen instead. | |
2096a5dc | 753 | * @owner: module that owns the video device node |
27a5e6d3 | 754 | * |
22e22125 HV |
755 | * The registration code assigns minor numbers and device node numbers |
756 | * based on the requested type and registers the new device node with | |
757 | * the kernel. | |
46b63377 HV |
758 | * |
759 | * This function assumes that struct video_device was zeroed when it | |
760 | * was allocated and does not contain any stale date. | |
761 | * | |
22e22125 HV |
762 | * An error is returned if no free minor or device node number could be |
763 | * found, or if the registration of the device node failed. | |
27a5e6d3 HV |
764 | * |
765 | * Zero is returned on success. | |
766 | * | |
767 | * Valid types are | |
768 | * | |
769 | * %VFL_TYPE_GRABBER - A frame grabber | |
770 | * | |
27a5e6d3 HV |
771 | * %VFL_TYPE_VBI - Vertical blank data (undecoded) |
772 | * | |
773 | * %VFL_TYPE_RADIO - A radio card | |
2096a5dc LP |
774 | * |
775 | * %VFL_TYPE_SUBDEV - A subdevice | |
d42626bd AP |
776 | * |
777 | * %VFL_TYPE_SDR - Software Defined Radio | |
27a5e6d3 | 778 | */ |
2096a5dc LP |
779 | int __video_register_device(struct video_device *vdev, int type, int nr, |
780 | int warn_if_nr_in_use, struct module *owner) | |
27a5e6d3 HV |
781 | { |
782 | int i = 0; | |
27a5e6d3 | 783 | int ret; |
dd89601d HV |
784 | int minor_offset = 0; |
785 | int minor_cnt = VIDEO_NUM_DEVICES; | |
786 | const char *name_base; | |
27a5e6d3 | 787 | |
dc93a70c HV |
788 | /* A minor value of -1 marks this video device as never |
789 | having been registered */ | |
428c8d19 | 790 | vdev->minor = -1; |
ee7aa9f8 | 791 | |
dc93a70c | 792 | /* the release callback MUST be present */ |
1fc2b5f7 | 793 | if (WARN_ON(!vdev->release)) |
f3b9f50e | 794 | return -EINVAL; |
1c1d86a1 HV |
795 | /* the v4l2_dev pointer MUST be present */ |
796 | if (WARN_ON(!vdev->v4l2_dev)) | |
797 | return -EINVAL; | |
f3b9f50e | 798 | |
1babcb46 SA |
799 | /* v4l2_fh support */ |
800 | spin_lock_init(&vdev->fh_lock); | |
801 | INIT_LIST_HEAD(&vdev->fh_list); | |
802 | ||
dc93a70c | 803 | /* Part 1: check device type */ |
27a5e6d3 HV |
804 | switch (type) { |
805 | case VFL_TYPE_GRABBER: | |
27a5e6d3 HV |
806 | name_base = "video"; |
807 | break; | |
27a5e6d3 | 808 | case VFL_TYPE_VBI: |
27a5e6d3 HV |
809 | name_base = "vbi"; |
810 | break; | |
811 | case VFL_TYPE_RADIO: | |
27a5e6d3 HV |
812 | name_base = "radio"; |
813 | break; | |
2096a5dc LP |
814 | case VFL_TYPE_SUBDEV: |
815 | name_base = "v4l-subdev"; | |
816 | break; | |
d42626bd AP |
817 | case VFL_TYPE_SDR: |
818 | /* Use device name 'swradio' because 'sdr' was already taken. */ | |
819 | name_base = "swradio"; | |
820 | break; | |
27a5e6d3 HV |
821 | default: |
822 | printk(KERN_ERR "%s called with unknown type: %d\n", | |
823 | __func__, type); | |
46f2c21c | 824 | return -EINVAL; |
27a5e6d3 HV |
825 | } |
826 | ||
dc93a70c HV |
827 | vdev->vfl_type = type; |
828 | vdev->cdev = NULL; | |
1c1d86a1 HV |
829 | if (vdev->dev_parent == NULL) |
830 | vdev->dev_parent = vdev->v4l2_dev->dev; | |
831 | if (vdev->ctrl_handler == NULL) | |
832 | vdev->ctrl_handler = vdev->v4l2_dev->ctrl_handler; | |
833 | /* If the prio state pointer is NULL, then use the v4l2_device | |
834 | prio state. */ | |
835 | if (vdev->prio == NULL) | |
836 | vdev->prio = &vdev->v4l2_dev->prio; | |
dd89601d | 837 | |
22e22125 | 838 | /* Part 2: find a free minor, device node number and device index. */ |
dd89601d HV |
839 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES |
840 | /* Keep the ranges for the first four types for historical | |
841 | * reasons. | |
842 | * Newer devices (not yet in place) should use the range | |
843 | * of 128-191 and just pick the first free minor there | |
844 | * (new style). */ | |
845 | switch (type) { | |
846 | case VFL_TYPE_GRABBER: | |
847 | minor_offset = 0; | |
848 | minor_cnt = 64; | |
849 | break; | |
850 | case VFL_TYPE_RADIO: | |
851 | minor_offset = 64; | |
852 | minor_cnt = 64; | |
853 | break; | |
dd89601d HV |
854 | case VFL_TYPE_VBI: |
855 | minor_offset = 224; | |
856 | minor_cnt = 32; | |
857 | break; | |
858 | default: | |
859 | minor_offset = 128; | |
860 | minor_cnt = 64; | |
861 | break; | |
862 | } | |
863 | #endif | |
864 | ||
22e22125 | 865 | /* Pick a device node number */ |
27a5e6d3 | 866 | mutex_lock(&videodev_lock); |
5062cb70 | 867 | nr = devnode_find(vdev, nr == -1 ? 0 : nr, minor_cnt); |
dd89601d | 868 | if (nr == minor_cnt) |
5062cb70 | 869 | nr = devnode_find(vdev, 0, minor_cnt); |
dd89601d | 870 | if (nr == minor_cnt) { |
22e22125 | 871 | printk(KERN_ERR "could not get a free device node number\n"); |
dd89601d HV |
872 | mutex_unlock(&videodev_lock); |
873 | return -ENFILE; | |
27a5e6d3 | 874 | } |
dd89601d | 875 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES |
22e22125 | 876 | /* 1-on-1 mapping of device node number to minor number */ |
dd89601d HV |
877 | i = nr; |
878 | #else | |
22e22125 HV |
879 | /* The device node number and minor numbers are independent, so |
880 | we just find the first free minor number. */ | |
dd89601d HV |
881 | for (i = 0; i < VIDEO_NUM_DEVICES; i++) |
882 | if (video_device[i] == NULL) | |
883 | break; | |
884 | if (i == VIDEO_NUM_DEVICES) { | |
885 | mutex_unlock(&videodev_lock); | |
886 | printk(KERN_ERR "could not get a free minor\n"); | |
887 | return -ENFILE; | |
888 | } | |
889 | #endif | |
dc93a70c HV |
890 | vdev->minor = i + minor_offset; |
891 | vdev->num = nr; | |
5062cb70 HV |
892 | devnode_set(vdev); |
893 | ||
dc93a70c HV |
894 | /* Should not happen since we thought this minor was free */ |
895 | WARN_ON(video_device[vdev->minor] != NULL); | |
7ae0cd9b | 896 | vdev->index = get_index(vdev); |
6c3df5da | 897 | video_device[vdev->minor] = vdev; |
27a5e6d3 HV |
898 | mutex_unlock(&videodev_lock); |
899 | ||
48ea0be0 HV |
900 | if (vdev->ioctl_ops) |
901 | determine_valid_ioctls(vdev); | |
902 | ||
dc93a70c HV |
903 | /* Part 3: Initialize the character device */ |
904 | vdev->cdev = cdev_alloc(); | |
905 | if (vdev->cdev == NULL) { | |
906 | ret = -ENOMEM; | |
907 | goto cleanup; | |
908 | } | |
86a5ef7d | 909 | vdev->cdev->ops = &v4l2_fops; |
2096a5dc | 910 | vdev->cdev->owner = owner; |
dc93a70c | 911 | ret = cdev_add(vdev->cdev, MKDEV(VIDEO_MAJOR, vdev->minor), 1); |
7f8ecfab HV |
912 | if (ret < 0) { |
913 | printk(KERN_ERR "%s: cdev_add failed\n", __func__); | |
dc93a70c HV |
914 | kfree(vdev->cdev); |
915 | vdev->cdev = NULL; | |
916 | goto cleanup; | |
7f8ecfab | 917 | } |
dc93a70c HV |
918 | |
919 | /* Part 4: register the device with sysfs */ | |
dc93a70c HV |
920 | vdev->dev.class = &video_class; |
921 | vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor); | |
1c1d86a1 | 922 | vdev->dev.parent = vdev->dev_parent; |
22e22125 | 923 | dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num); |
dc93a70c | 924 | ret = device_register(&vdev->dev); |
27a5e6d3 HV |
925 | if (ret < 0) { |
926 | printk(KERN_ERR "%s: device_register failed\n", __func__); | |
dc93a70c | 927 | goto cleanup; |
27a5e6d3 | 928 | } |
dc93a70c HV |
929 | /* Register the release callback that will be called when the last |
930 | reference to the device goes away. */ | |
931 | vdev->dev.release = v4l2_device_release; | |
27a5e6d3 | 932 | |
6b5270d2 | 933 | if (nr != -1 && nr != vdev->num && warn_if_nr_in_use) |
eac8ea53 LP |
934 | printk(KERN_WARNING "%s: requested %s%d, got %s\n", __func__, |
935 | name_base, nr, video_device_node_name(vdev)); | |
bedf8bcf HV |
936 | |
937 | /* Increase v4l2_device refcount */ | |
d9bfbcc0 | 938 | v4l2_device_get(vdev->v4l2_dev); |
bedf8bcf | 939 | |
2c0ab67b LP |
940 | #if defined(CONFIG_MEDIA_CONTROLLER) |
941 | /* Part 5: Register the entity. */ | |
d9bfbcc0 | 942 | if (vdev->v4l2_dev->mdev && |
c4f0b78a | 943 | vdev->vfl_type != VFL_TYPE_SUBDEV) { |
2c0ab67b LP |
944 | vdev->entity.type = MEDIA_ENT_T_DEVNODE_V4L; |
945 | vdev->entity.name = vdev->name; | |
fa5034c6 CL |
946 | vdev->entity.info.v4l.major = VIDEO_MAJOR; |
947 | vdev->entity.info.v4l.minor = vdev->minor; | |
2c0ab67b LP |
948 | ret = media_device_register_entity(vdev->v4l2_dev->mdev, |
949 | &vdev->entity); | |
950 | if (ret < 0) | |
951 | printk(KERN_WARNING | |
952 | "%s: media_device_register_entity failed\n", | |
953 | __func__); | |
954 | } | |
955 | #endif | |
956 | /* Part 6: Activate this minor. The char device can now be used. */ | |
957b4aa9 | 957 | set_bit(V4L2_FL_REGISTERED, &vdev->flags); |
2c0ab67b | 958 | |
dc93a70c | 959 | return 0; |
7f8ecfab | 960 | |
dc93a70c | 961 | cleanup: |
27a5e6d3 | 962 | mutex_lock(&videodev_lock); |
dc93a70c HV |
963 | if (vdev->cdev) |
964 | cdev_del(vdev->cdev); | |
1056e438 | 965 | video_device[vdev->minor] = NULL; |
5062cb70 | 966 | devnode_clear(vdev); |
27a5e6d3 | 967 | mutex_unlock(&videodev_lock); |
dc93a70c HV |
968 | /* Mark this video device as never having been registered. */ |
969 | vdev->minor = -1; | |
27a5e6d3 HV |
970 | return ret; |
971 | } | |
2096a5dc | 972 | EXPORT_SYMBOL(__video_register_device); |
6b5270d2 | 973 | |
27a5e6d3 HV |
974 | /** |
975 | * video_unregister_device - unregister a video4linux device | |
dc93a70c | 976 | * @vdev: the device to unregister |
27a5e6d3 | 977 | * |
dc93a70c HV |
978 | * This unregisters the passed device. Future open calls will |
979 | * be met with errors. | |
27a5e6d3 | 980 | */ |
dc93a70c | 981 | void video_unregister_device(struct video_device *vdev) |
27a5e6d3 | 982 | { |
dc93a70c | 983 | /* Check if vdev was ever registered at all */ |
957b4aa9 | 984 | if (!vdev || !video_is_registered(vdev)) |
dc93a70c HV |
985 | return; |
986 | ||
ca9afe6f HV |
987 | mutex_lock(&videodev_lock); |
988 | /* This must be in a critical section to prevent a race with v4l2_open. | |
989 | * Once this bit has been cleared video_get may never be called again. | |
990 | */ | |
957b4aa9 | 991 | clear_bit(V4L2_FL_REGISTERED, &vdev->flags); |
ca9afe6f | 992 | mutex_unlock(&videodev_lock); |
dc93a70c | 993 | device_unregister(&vdev->dev); |
27a5e6d3 HV |
994 | } |
995 | EXPORT_SYMBOL(video_unregister_device); | |
996 | ||
27a5e6d3 HV |
997 | /* |
998 | * Initialise video for linux | |
999 | */ | |
27a5e6d3 HV |
1000 | static int __init videodev_init(void) |
1001 | { | |
7f8ecfab | 1002 | dev_t dev = MKDEV(VIDEO_MAJOR, 0); |
27a5e6d3 HV |
1003 | int ret; |
1004 | ||
1005 | printk(KERN_INFO "Linux video capture interface: v2.00\n"); | |
7f8ecfab HV |
1006 | ret = register_chrdev_region(dev, VIDEO_NUM_DEVICES, VIDEO_NAME); |
1007 | if (ret < 0) { | |
1008 | printk(KERN_WARNING "videodev: unable to get major %d\n", | |
1009 | VIDEO_MAJOR); | |
1010 | return ret; | |
27a5e6d3 HV |
1011 | } |
1012 | ||
1013 | ret = class_register(&video_class); | |
1014 | if (ret < 0) { | |
7f8ecfab | 1015 | unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); |
27a5e6d3 HV |
1016 | printk(KERN_WARNING "video_dev: class_register failed\n"); |
1017 | return -EIO; | |
1018 | } | |
1019 | ||
1020 | return 0; | |
1021 | } | |
1022 | ||
1023 | static void __exit videodev_exit(void) | |
1024 | { | |
7f8ecfab HV |
1025 | dev_t dev = MKDEV(VIDEO_MAJOR, 0); |
1026 | ||
27a5e6d3 | 1027 | class_unregister(&video_class); |
7f8ecfab | 1028 | unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); |
27a5e6d3 HV |
1029 | } |
1030 | ||
ee981c6f | 1031 | subsys_initcall(videodev_init); |
27a5e6d3 HV |
1032 | module_exit(videodev_exit) |
1033 | ||
1034 | MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@infradead.org>"); | |
1035 | MODULE_DESCRIPTION("Device registrar for Video4Linux drivers v2"); | |
1036 | MODULE_LICENSE("GPL"); | |
cbb72b0f | 1037 | MODULE_ALIAS_CHARDEV_MAJOR(VIDEO_MAJOR); |