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) |
d9c21e3e MCC |
197 | if (v4l2_dev->mdev) { |
198 | /* Remove interfaces and interface links */ | |
199 | media_devnode_remove(vdev->intf_devnode); | |
4ca72efa | 200 | if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) |
d9c21e3e MCC |
201 | media_device_unregister_entity(&vdev->entity); |
202 | } | |
c064b8ea LP |
203 | #endif |
204 | ||
8280b662 HV |
205 | /* Do not call v4l2_device_put if there is no release callback set. |
206 | * Drivers that have no v4l2_device release callback might free the | |
207 | * v4l2_dev instance in the video_device release callback below, so we | |
208 | * must perform this check here. | |
209 | * | |
210 | * TODO: In the long run all drivers that use v4l2_device should use the | |
211 | * v4l2_device release callback. This check will then be unnecessary. | |
212 | */ | |
d9bfbcc0 | 213 | if (v4l2_dev->release == NULL) |
8280b662 HV |
214 | v4l2_dev = NULL; |
215 | ||
dc93a70c HV |
216 | /* Release video_device and perform other |
217 | cleanups as needed. */ | |
218 | vdev->release(vdev); | |
bedf8bcf HV |
219 | |
220 | /* Decrease v4l2_device refcount */ | |
221 | if (v4l2_dev) | |
222 | v4l2_device_put(v4l2_dev); | |
27a5e6d3 HV |
223 | } |
224 | ||
225 | static struct class video_class = { | |
226 | .name = VIDEO_NAME, | |
13e2237f | 227 | .dev_groups = video_device_groups, |
27a5e6d3 HV |
228 | }; |
229 | ||
27a5e6d3 HV |
230 | struct video_device *video_devdata(struct file *file) |
231 | { | |
496ad9aa | 232 | return video_device[iminor(file_inode(file))]; |
27a5e6d3 HV |
233 | } |
234 | EXPORT_SYMBOL(video_devdata); | |
235 | ||
02265493 HV |
236 | |
237 | /* Priority handling */ | |
238 | ||
239 | static inline bool prio_is_valid(enum v4l2_priority prio) | |
240 | { | |
241 | return prio == V4L2_PRIORITY_BACKGROUND || | |
242 | prio == V4L2_PRIORITY_INTERACTIVE || | |
243 | prio == V4L2_PRIORITY_RECORD; | |
244 | } | |
245 | ||
246 | void v4l2_prio_init(struct v4l2_prio_state *global) | |
247 | { | |
248 | memset(global, 0, sizeof(*global)); | |
249 | } | |
250 | EXPORT_SYMBOL(v4l2_prio_init); | |
251 | ||
252 | int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local, | |
253 | enum v4l2_priority new) | |
254 | { | |
255 | if (!prio_is_valid(new)) | |
256 | return -EINVAL; | |
257 | if (*local == new) | |
258 | return 0; | |
259 | ||
260 | atomic_inc(&global->prios[new]); | |
261 | if (prio_is_valid(*local)) | |
262 | atomic_dec(&global->prios[*local]); | |
263 | *local = new; | |
264 | return 0; | |
265 | } | |
266 | EXPORT_SYMBOL(v4l2_prio_change); | |
267 | ||
268 | void v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local) | |
269 | { | |
270 | v4l2_prio_change(global, local, V4L2_PRIORITY_DEFAULT); | |
271 | } | |
272 | EXPORT_SYMBOL(v4l2_prio_open); | |
273 | ||
274 | void v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority local) | |
275 | { | |
276 | if (prio_is_valid(local)) | |
277 | atomic_dec(&global->prios[local]); | |
278 | } | |
279 | EXPORT_SYMBOL(v4l2_prio_close); | |
280 | ||
281 | enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global) | |
282 | { | |
283 | if (atomic_read(&global->prios[V4L2_PRIORITY_RECORD]) > 0) | |
284 | return V4L2_PRIORITY_RECORD; | |
285 | if (atomic_read(&global->prios[V4L2_PRIORITY_INTERACTIVE]) > 0) | |
286 | return V4L2_PRIORITY_INTERACTIVE; | |
287 | if (atomic_read(&global->prios[V4L2_PRIORITY_BACKGROUND]) > 0) | |
288 | return V4L2_PRIORITY_BACKGROUND; | |
289 | return V4L2_PRIORITY_UNSET; | |
290 | } | |
291 | EXPORT_SYMBOL(v4l2_prio_max); | |
292 | ||
293 | int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority local) | |
294 | { | |
295 | return (local < v4l2_prio_max(global)) ? -EBUSY : 0; | |
296 | } | |
297 | EXPORT_SYMBOL(v4l2_prio_check); | |
298 | ||
299 | ||
dc93a70c HV |
300 | static ssize_t v4l2_read(struct file *filp, char __user *buf, |
301 | size_t sz, loff_t *off) | |
302 | { | |
303 | struct video_device *vdev = video_devdata(filp); | |
2877842d | 304 | int ret = -ENODEV; |
dc93a70c HV |
305 | |
306 | if (!vdev->fops->read) | |
307 | return -EINVAL; | |
ee6869af HV |
308 | if (video_is_registered(vdev)) |
309 | ret = vdev->fops->read(filp, buf, sz, off); | |
17028cdb HV |
310 | if ((vdev->dev_debug & V4L2_DEV_DEBUG_FOP) && |
311 | (vdev->dev_debug & V4L2_DEV_DEBUG_STREAMING)) | |
cc4b7e7f HV |
312 | printk(KERN_DEBUG "%s: read: %zd (%d)\n", |
313 | video_device_node_name(vdev), sz, ret); | |
ee6869af | 314 | return ret; |
dc93a70c HV |
315 | } |
316 | ||
317 | static ssize_t v4l2_write(struct file *filp, const char __user *buf, | |
318 | size_t sz, loff_t *off) | |
319 | { | |
320 | struct video_device *vdev = video_devdata(filp); | |
2877842d | 321 | int ret = -ENODEV; |
dc93a70c HV |
322 | |
323 | if (!vdev->fops->write) | |
324 | return -EINVAL; | |
ee6869af HV |
325 | if (video_is_registered(vdev)) |
326 | ret = vdev->fops->write(filp, buf, sz, off); | |
17028cdb HV |
327 | if ((vdev->dev_debug & V4L2_DEV_DEBUG_FOP) && |
328 | (vdev->dev_debug & V4L2_DEV_DEBUG_STREAMING)) | |
cc4b7e7f HV |
329 | printk(KERN_DEBUG "%s: write: %zd (%d)\n", |
330 | video_device_node_name(vdev), sz, ret); | |
ee6869af | 331 | return ret; |
dc93a70c HV |
332 | } |
333 | ||
334 | static unsigned int v4l2_poll(struct file *filp, struct poll_table_struct *poll) | |
335 | { | |
336 | struct video_device *vdev = video_devdata(filp); | |
cf533735 | 337 | unsigned int res = POLLERR | POLLHUP; |
ee6869af HV |
338 | |
339 | if (!vdev->fops->poll) | |
2877842d | 340 | return DEFAULT_POLLMASK; |
ee6869af | 341 | if (video_is_registered(vdev)) |
cf533735 | 342 | res = vdev->fops->poll(filp, poll); |
17028cdb | 343 | if (vdev->dev_debug & V4L2_DEV_DEBUG_POLL) |
cc4b7e7f | 344 | printk(KERN_DEBUG "%s: poll: %08x\n", |
cf533735 HV |
345 | video_device_node_name(vdev), res); |
346 | return res; | |
dc93a70c HV |
347 | } |
348 | ||
86a5ef7d | 349 | static long v4l2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
dc93a70c HV |
350 | { |
351 | struct video_device *vdev = video_devdata(filp); | |
72420630 | 352 | int ret = -ENODEV; |
dc93a70c | 353 | |
86a5ef7d | 354 | if (vdev->fops->unlocked_ioctl) { |
5a5adf6b | 355 | struct mutex *lock = v4l2_ioctl_get_lock(vdev, cmd); |
8ab75e3e | 356 | |
5a5adf6b HV |
357 | if (lock && mutex_lock_interruptible(lock)) |
358 | return -ERESTARTSYS; | |
72420630 MCC |
359 | if (video_is_registered(vdev)) |
360 | ret = vdev->fops->unlocked_ioctl(filp, cmd, arg); | |
5a5adf6b HV |
361 | if (lock) |
362 | mutex_unlock(lock); | |
86a5ef7d AB |
363 | } else |
364 | ret = -ENOTTY; | |
dc93a70c | 365 | |
86a5ef7d | 366 | return ret; |
dc93a70c HV |
367 | } |
368 | ||
ecc6517d BL |
369 | #ifdef CONFIG_MMU |
370 | #define v4l2_get_unmapped_area NULL | |
371 | #else | |
372 | static unsigned long v4l2_get_unmapped_area(struct file *filp, | |
373 | unsigned long addr, unsigned long len, unsigned long pgoff, | |
374 | unsigned long flags) | |
375 | { | |
376 | struct video_device *vdev = video_devdata(filp); | |
cc4b7e7f | 377 | int ret; |
ecc6517d BL |
378 | |
379 | if (!vdev->fops->get_unmapped_area) | |
380 | return -ENOSYS; | |
381 | if (!video_is_registered(vdev)) | |
382 | return -ENODEV; | |
cc4b7e7f | 383 | ret = vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags); |
17028cdb | 384 | if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP) |
cc4b7e7f HV |
385 | printk(KERN_DEBUG "%s: get_unmapped_area (%d)\n", |
386 | video_device_node_name(vdev), ret); | |
387 | return ret; | |
ecc6517d BL |
388 | } |
389 | #endif | |
390 | ||
dc93a70c HV |
391 | static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm) |
392 | { | |
393 | struct video_device *vdev = video_devdata(filp); | |
ee6869af HV |
394 | int ret = -ENODEV; |
395 | ||
396 | if (!vdev->fops->mmap) | |
cf533735 | 397 | return -ENODEV; |
ee6869af HV |
398 | if (video_is_registered(vdev)) |
399 | ret = vdev->fops->mmap(filp, vm); | |
17028cdb | 400 | if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP) |
cc4b7e7f HV |
401 | printk(KERN_DEBUG "%s: mmap (%d)\n", |
402 | video_device_node_name(vdev), ret); | |
ee6869af | 403 | return ret; |
dc93a70c HV |
404 | } |
405 | ||
406 | /* Override for the open function */ | |
407 | static int v4l2_open(struct inode *inode, struct file *filp) | |
408 | { | |
409 | struct video_device *vdev; | |
65d9ff9c | 410 | int ret = 0; |
dc93a70c HV |
411 | |
412 | /* Check if the video device is available */ | |
413 | mutex_lock(&videodev_lock); | |
414 | vdev = video_devdata(filp); | |
ee6869af | 415 | /* return ENODEV if the video device has already been removed. */ |
ca9afe6f | 416 | if (vdev == NULL || !video_is_registered(vdev)) { |
dc93a70c HV |
417 | mutex_unlock(&videodev_lock); |
418 | return -ENODEV; | |
419 | } | |
420 | /* and increase the device refcount */ | |
421 | video_get(vdev); | |
422 | mutex_unlock(&videodev_lock); | |
ee6869af | 423 | if (vdev->fops->open) { |
ee6869af HV |
424 | if (video_is_registered(vdev)) |
425 | ret = vdev->fops->open(filp); | |
426 | else | |
427 | ret = -ENODEV; | |
ee6869af | 428 | } |
65d9ff9c | 429 | |
17028cdb | 430 | if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP) |
cc4b7e7f HV |
431 | printk(KERN_DEBUG "%s: open (%d)\n", |
432 | video_device_node_name(vdev), ret); | |
8f695d3f EG |
433 | /* decrease the refcount in case of an error */ |
434 | if (ret) | |
435 | video_put(vdev); | |
dc93a70c HV |
436 | return ret; |
437 | } | |
438 | ||
439 | /* Override for the release function */ | |
440 | static int v4l2_release(struct inode *inode, struct file *filp) | |
441 | { | |
442 | struct video_device *vdev = video_devdata(filp); | |
65d9ff9c HV |
443 | int ret = 0; |
444 | ||
cf533735 HV |
445 | if (vdev->fops->release) |
446 | ret = vdev->fops->release(filp); | |
17028cdb | 447 | if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP) |
cc4b7e7f HV |
448 | printk(KERN_DEBUG "%s: release\n", |
449 | video_device_node_name(vdev)); | |
cf533735 | 450 | |
8f695d3f EG |
451 | /* decrease the refcount unconditionally since the release() |
452 | return value is ignored. */ | |
453 | video_put(vdev); | |
dc93a70c HV |
454 | return ret; |
455 | } | |
456 | ||
dc93a70c HV |
457 | static const struct file_operations v4l2_fops = { |
458 | .owner = THIS_MODULE, | |
459 | .read = v4l2_read, | |
460 | .write = v4l2_write, | |
461 | .open = v4l2_open, | |
ecc6517d | 462 | .get_unmapped_area = v4l2_get_unmapped_area, |
dc93a70c | 463 | .mmap = v4l2_mmap, |
86a5ef7d | 464 | .unlocked_ioctl = v4l2_ioctl, |
dc93a70c | 465 | #ifdef CONFIG_COMPAT |
9bb7cde7 | 466 | .compat_ioctl = v4l2_compat_ioctl32, |
dc93a70c HV |
467 | #endif |
468 | .release = v4l2_release, | |
469 | .poll = v4l2_poll, | |
470 | .llseek = no_llseek, | |
471 | }; | |
472 | ||
27a5e6d3 | 473 | /** |
1c1d86a1 HV |
474 | * get_index - assign stream index number based on v4l2_dev |
475 | * @vdev: video_device to assign index number to, vdev->v4l2_dev should be assigned | |
27a5e6d3 | 476 | * |
dc93a70c | 477 | * Note that when this is called the new device has not yet been registered |
7ae0cd9b | 478 | * in the video_device array, but it was able to obtain a minor number. |
27a5e6d3 | 479 | * |
7ae0cd9b HV |
480 | * This means that we can always obtain a free stream index number since |
481 | * the worst case scenario is that there are VIDEO_NUM_DEVICES - 1 slots in | |
482 | * use of the video_device array. | |
483 | * | |
484 | * Returns a free index number. | |
27a5e6d3 | 485 | */ |
7ae0cd9b | 486 | static int get_index(struct video_device *vdev) |
27a5e6d3 | 487 | { |
775a05dd HV |
488 | /* This can be static since this function is called with the global |
489 | videodev_lock held. */ | |
490 | static DECLARE_BITMAP(used, VIDEO_NUM_DEVICES); | |
27a5e6d3 HV |
491 | int i; |
492 | ||
775a05dd | 493 | bitmap_zero(used, VIDEO_NUM_DEVICES); |
806e5b7c | 494 | |
27a5e6d3 HV |
495 | for (i = 0; i < VIDEO_NUM_DEVICES; i++) { |
496 | if (video_device[i] != NULL && | |
1c1d86a1 | 497 | video_device[i]->v4l2_dev == vdev->v4l2_dev) { |
775a05dd | 498 | set_bit(video_device[i]->index, used); |
27a5e6d3 HV |
499 | } |
500 | } | |
501 | ||
7ae0cd9b | 502 | return find_first_zero_bit(used, VIDEO_NUM_DEVICES); |
27a5e6d3 HV |
503 | } |
504 | ||
48ea0be0 HV |
505 | #define SET_VALID_IOCTL(ops, cmd, op) \ |
506 | if (ops->op) \ | |
507 | set_bit(_IOC_NR(cmd), valid_ioctls) | |
508 | ||
509 | /* This determines which ioctls are actually implemented in the driver. | |
510 | It's a one-time thing which simplifies video_ioctl2 as it can just do | |
511 | a bit test. | |
512 | ||
513 | Note that drivers can override this by setting bits to 1 in | |
514 | vdev->valid_ioctls. If an ioctl is marked as 1 when this function is | |
515 | called, then that ioctl will actually be marked as unimplemented. | |
516 | ||
517 | It does that by first setting up the local valid_ioctls bitmap, and | |
518 | at the end do a: | |
519 | ||
520 | vdev->valid_ioctls = valid_ioctls & ~(vdev->valid_ioctls) | |
521 | */ | |
522 | static void determine_valid_ioctls(struct video_device *vdev) | |
523 | { | |
524 | DECLARE_BITMAP(valid_ioctls, BASE_VIDIOC_PRIVATE); | |
525 | const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops; | |
4b20259f HV |
526 | bool is_vid = vdev->vfl_type == VFL_TYPE_GRABBER; |
527 | bool is_vbi = vdev->vfl_type == VFL_TYPE_VBI; | |
bfffd743 | 528 | bool is_radio = vdev->vfl_type == VFL_TYPE_RADIO; |
582c52cb | 529 | bool is_sdr = vdev->vfl_type == VFL_TYPE_SDR; |
b2fe22d0 | 530 | bool is_tch = vdev->vfl_type == VFL_TYPE_TOUCH; |
4b20259f HV |
531 | bool is_rx = vdev->vfl_dir != VFL_DIR_TX; |
532 | bool is_tx = vdev->vfl_dir != VFL_DIR_RX; | |
48ea0be0 HV |
533 | |
534 | bitmap_zero(valid_ioctls, BASE_VIDIOC_PRIVATE); | |
535 | ||
90d0fc49 HV |
536 | /* vfl_type and vfl_dir independent ioctls */ |
537 | ||
48ea0be0 | 538 | SET_VALID_IOCTL(ops, VIDIOC_QUERYCAP, vidioc_querycap); |
2438e78a HV |
539 | set_bit(_IOC_NR(VIDIOC_G_PRIORITY), valid_ioctls); |
540 | set_bit(_IOC_NR(VIDIOC_S_PRIORITY), valid_ioctls); | |
541 | ||
90d0fc49 HV |
542 | /* Note: the control handler can also be passed through the filehandle, |
543 | and that can't be tested here. If the bit for these control ioctls | |
544 | is set, then the ioctl is valid. But if it is 0, then it can still | |
545 | be valid if the filehandle passed the control handler. */ | |
546 | if (vdev->ctrl_handler || ops->vidioc_queryctrl) | |
547 | set_bit(_IOC_NR(VIDIOC_QUERYCTRL), valid_ioctls); | |
e6bee368 HV |
548 | if (vdev->ctrl_handler || ops->vidioc_query_ext_ctrl) |
549 | set_bit(_IOC_NR(VIDIOC_QUERY_EXT_CTRL), valid_ioctls); | |
90d0fc49 HV |
550 | if (vdev->ctrl_handler || ops->vidioc_g_ctrl || ops->vidioc_g_ext_ctrls) |
551 | set_bit(_IOC_NR(VIDIOC_G_CTRL), valid_ioctls); | |
552 | if (vdev->ctrl_handler || ops->vidioc_s_ctrl || ops->vidioc_s_ext_ctrls) | |
553 | set_bit(_IOC_NR(VIDIOC_S_CTRL), valid_ioctls); | |
554 | if (vdev->ctrl_handler || ops->vidioc_g_ext_ctrls) | |
555 | set_bit(_IOC_NR(VIDIOC_G_EXT_CTRLS), valid_ioctls); | |
556 | if (vdev->ctrl_handler || ops->vidioc_s_ext_ctrls) | |
557 | set_bit(_IOC_NR(VIDIOC_S_EXT_CTRLS), valid_ioctls); | |
558 | if (vdev->ctrl_handler || ops->vidioc_try_ext_ctrls) | |
559 | set_bit(_IOC_NR(VIDIOC_TRY_EXT_CTRLS), valid_ioctls); | |
560 | if (vdev->ctrl_handler || ops->vidioc_querymenu) | |
561 | set_bit(_IOC_NR(VIDIOC_QUERYMENU), valid_ioctls); | |
562 | SET_VALID_IOCTL(ops, VIDIOC_G_FREQUENCY, vidioc_g_frequency); | |
563 | SET_VALID_IOCTL(ops, VIDIOC_S_FREQUENCY, vidioc_s_frequency); | |
564 | SET_VALID_IOCTL(ops, VIDIOC_LOG_STATUS, vidioc_log_status); | |
565 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
96b03d2a | 566 | set_bit(_IOC_NR(VIDIOC_DBG_G_CHIP_INFO), valid_ioctls); |
79b0c640 HV |
567 | set_bit(_IOC_NR(VIDIOC_DBG_G_REGISTER), valid_ioctls); |
568 | set_bit(_IOC_NR(VIDIOC_DBG_S_REGISTER), valid_ioctls); | |
90d0fc49 | 569 | #endif |
90d0fc49 HV |
570 | /* yes, really vidioc_subscribe_event */ |
571 | SET_VALID_IOCTL(ops, VIDIOC_DQEVENT, vidioc_subscribe_event); | |
572 | SET_VALID_IOCTL(ops, VIDIOC_SUBSCRIBE_EVENT, vidioc_subscribe_event); | |
573 | SET_VALID_IOCTL(ops, VIDIOC_UNSUBSCRIBE_EVENT, vidioc_unsubscribe_event); | |
90d0fc49 HV |
574 | if (ops->vidioc_enum_freq_bands || ops->vidioc_g_tuner || ops->vidioc_g_modulator) |
575 | set_bit(_IOC_NR(VIDIOC_ENUM_FREQ_BANDS), valid_ioctls); | |
576 | ||
b2fe22d0 | 577 | if (is_vid || is_tch) { |
90d0fc49 | 578 | /* video specific ioctls */ |
4b20259f HV |
579 | if ((is_rx && (ops->vidioc_enum_fmt_vid_cap || |
580 | ops->vidioc_enum_fmt_vid_cap_mplane || | |
581 | ops->vidioc_enum_fmt_vid_overlay)) || | |
582 | (is_tx && (ops->vidioc_enum_fmt_vid_out || | |
583 | ops->vidioc_enum_fmt_vid_out_mplane))) | |
584 | set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls); | |
585 | if ((is_rx && (ops->vidioc_g_fmt_vid_cap || | |
586 | ops->vidioc_g_fmt_vid_cap_mplane || | |
587 | ops->vidioc_g_fmt_vid_overlay)) || | |
588 | (is_tx && (ops->vidioc_g_fmt_vid_out || | |
589 | ops->vidioc_g_fmt_vid_out_mplane || | |
590 | ops->vidioc_g_fmt_vid_out_overlay))) | |
591 | set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); | |
592 | if ((is_rx && (ops->vidioc_s_fmt_vid_cap || | |
593 | ops->vidioc_s_fmt_vid_cap_mplane || | |
594 | ops->vidioc_s_fmt_vid_overlay)) || | |
595 | (is_tx && (ops->vidioc_s_fmt_vid_out || | |
596 | ops->vidioc_s_fmt_vid_out_mplane || | |
597 | ops->vidioc_s_fmt_vid_out_overlay))) | |
598 | set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); | |
599 | if ((is_rx && (ops->vidioc_try_fmt_vid_cap || | |
600 | ops->vidioc_try_fmt_vid_cap_mplane || | |
601 | ops->vidioc_try_fmt_vid_overlay)) || | |
602 | (is_tx && (ops->vidioc_try_fmt_vid_out || | |
603 | ops->vidioc_try_fmt_vid_out_mplane || | |
604 | ops->vidioc_try_fmt_vid_out_overlay))) | |
605 | set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); | |
90d0fc49 HV |
606 | SET_VALID_IOCTL(ops, VIDIOC_OVERLAY, vidioc_overlay); |
607 | SET_VALID_IOCTL(ops, VIDIOC_G_FBUF, vidioc_g_fbuf); | |
608 | SET_VALID_IOCTL(ops, VIDIOC_S_FBUF, vidioc_s_fbuf); | |
609 | SET_VALID_IOCTL(ops, VIDIOC_G_JPEGCOMP, vidioc_g_jpegcomp); | |
610 | SET_VALID_IOCTL(ops, VIDIOC_S_JPEGCOMP, vidioc_s_jpegcomp); | |
611 | SET_VALID_IOCTL(ops, VIDIOC_G_ENC_INDEX, vidioc_g_enc_index); | |
612 | SET_VALID_IOCTL(ops, VIDIOC_ENCODER_CMD, vidioc_encoder_cmd); | |
613 | SET_VALID_IOCTL(ops, VIDIOC_TRY_ENCODER_CMD, vidioc_try_encoder_cmd); | |
614 | SET_VALID_IOCTL(ops, VIDIOC_DECODER_CMD, vidioc_decoder_cmd); | |
615 | SET_VALID_IOCTL(ops, VIDIOC_TRY_DECODER_CMD, vidioc_try_decoder_cmd); | |
616 | SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes); | |
617 | SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals); | |
2c9fc463 HV |
618 | if (ops->vidioc_g_crop || ops->vidioc_g_selection) |
619 | set_bit(_IOC_NR(VIDIOC_G_CROP), valid_ioctls); | |
620 | if (ops->vidioc_s_crop || ops->vidioc_s_selection) | |
621 | set_bit(_IOC_NR(VIDIOC_S_CROP), valid_ioctls); | |
622 | SET_VALID_IOCTL(ops, VIDIOC_G_SELECTION, vidioc_g_selection); | |
623 | SET_VALID_IOCTL(ops, VIDIOC_S_SELECTION, vidioc_s_selection); | |
624 | if (ops->vidioc_cropcap || ops->vidioc_g_selection) | |
625 | set_bit(_IOC_NR(VIDIOC_CROPCAP), valid_ioctls); | |
4b20259f | 626 | } else if (is_vbi) { |
90d0fc49 | 627 | /* vbi specific ioctls */ |
4b20259f HV |
628 | if ((is_rx && (ops->vidioc_g_fmt_vbi_cap || |
629 | ops->vidioc_g_fmt_sliced_vbi_cap)) || | |
630 | (is_tx && (ops->vidioc_g_fmt_vbi_out || | |
631 | ops->vidioc_g_fmt_sliced_vbi_out))) | |
632 | set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); | |
633 | if ((is_rx && (ops->vidioc_s_fmt_vbi_cap || | |
634 | ops->vidioc_s_fmt_sliced_vbi_cap)) || | |
635 | (is_tx && (ops->vidioc_s_fmt_vbi_out || | |
636 | ops->vidioc_s_fmt_sliced_vbi_out))) | |
637 | set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); | |
638 | if ((is_rx && (ops->vidioc_try_fmt_vbi_cap || | |
639 | ops->vidioc_try_fmt_sliced_vbi_cap)) || | |
640 | (is_tx && (ops->vidioc_try_fmt_vbi_out || | |
641 | ops->vidioc_try_fmt_sliced_vbi_out))) | |
642 | set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); | |
90d0fc49 | 643 | SET_VALID_IOCTL(ops, VIDIOC_G_SLICED_VBI_CAP, vidioc_g_sliced_vbi_cap); |
9effc72f AP |
644 | } else if (is_sdr && is_rx) { |
645 | /* SDR receiver specific ioctls */ | |
582c52cb AP |
646 | if (ops->vidioc_enum_fmt_sdr_cap) |
647 | set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls); | |
648 | if (ops->vidioc_g_fmt_sdr_cap) | |
649 | set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); | |
650 | if (ops->vidioc_s_fmt_sdr_cap) | |
651 | set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); | |
652 | if (ops->vidioc_try_fmt_sdr_cap) | |
653 | set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); | |
9effc72f AP |
654 | } else if (is_sdr && is_tx) { |
655 | /* SDR transmitter specific ioctls */ | |
656 | if (ops->vidioc_enum_fmt_sdr_out) | |
657 | set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls); | |
658 | if (ops->vidioc_g_fmt_sdr_out) | |
659 | set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls); | |
660 | if (ops->vidioc_s_fmt_sdr_out) | |
661 | set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls); | |
662 | if (ops->vidioc_try_fmt_sdr_out) | |
663 | set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls); | |
4b20259f | 664 | } |
582c52cb | 665 | |
b2fe22d0 | 666 | if (is_vid || is_vbi || is_sdr || is_tch) { |
582c52cb | 667 | /* ioctls valid for video, vbi or sdr */ |
5815d0c4 FS |
668 | SET_VALID_IOCTL(ops, VIDIOC_REQBUFS, vidioc_reqbufs); |
669 | SET_VALID_IOCTL(ops, VIDIOC_QUERYBUF, vidioc_querybuf); | |
670 | SET_VALID_IOCTL(ops, VIDIOC_QBUF, vidioc_qbuf); | |
671 | SET_VALID_IOCTL(ops, VIDIOC_EXPBUF, vidioc_expbuf); | |
672 | SET_VALID_IOCTL(ops, VIDIOC_DQBUF, vidioc_dqbuf); | |
673 | SET_VALID_IOCTL(ops, VIDIOC_CREATE_BUFS, vidioc_create_bufs); | |
674 | SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, vidioc_prepare_buf); | |
72be89c8 HV |
675 | SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon); |
676 | SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff); | |
582c52cb AP |
677 | } |
678 | ||
b2fe22d0 | 679 | if (is_vid || is_vbi || is_tch) { |
582c52cb | 680 | /* ioctls valid for video or vbi */ |
4b20259f HV |
681 | if (ops->vidioc_s_std) |
682 | set_bit(_IOC_NR(VIDIOC_ENUMSTD), valid_ioctls); | |
4b20259f | 683 | SET_VALID_IOCTL(ops, VIDIOC_S_STD, vidioc_s_std); |
ca371575 | 684 | SET_VALID_IOCTL(ops, VIDIOC_G_STD, vidioc_g_std); |
4b20259f | 685 | if (is_rx) { |
90d0fc49 | 686 | SET_VALID_IOCTL(ops, VIDIOC_QUERYSTD, vidioc_querystd); |
4b20259f HV |
687 | SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input); |
688 | SET_VALID_IOCTL(ops, VIDIOC_G_INPUT, vidioc_g_input); | |
689 | SET_VALID_IOCTL(ops, VIDIOC_S_INPUT, vidioc_s_input); | |
690 | SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDIO, vidioc_enumaudio); | |
691 | SET_VALID_IOCTL(ops, VIDIOC_G_AUDIO, vidioc_g_audio); | |
692 | SET_VALID_IOCTL(ops, VIDIOC_S_AUDIO, vidioc_s_audio); | |
90d0fc49 | 693 | SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings); |
dd519bb3 | 694 | SET_VALID_IOCTL(ops, VIDIOC_S_EDID, vidioc_s_edid); |
4b20259f HV |
695 | } |
696 | if (is_tx) { | |
697 | SET_VALID_IOCTL(ops, VIDIOC_ENUMOUTPUT, vidioc_enum_output); | |
698 | SET_VALID_IOCTL(ops, VIDIOC_G_OUTPUT, vidioc_g_output); | |
699 | SET_VALID_IOCTL(ops, VIDIOC_S_OUTPUT, vidioc_s_output); | |
700 | SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDOUT, vidioc_enumaudout); | |
701 | SET_VALID_IOCTL(ops, VIDIOC_G_AUDOUT, vidioc_g_audout); | |
702 | SET_VALID_IOCTL(ops, VIDIOC_S_AUDOUT, vidioc_s_audout); | |
703 | } | |
4b20259f | 704 | if (ops->vidioc_g_parm || (vdev->vfl_type == VFL_TYPE_GRABBER && |
ca371575 | 705 | ops->vidioc_g_std)) |
4b20259f HV |
706 | set_bit(_IOC_NR(VIDIOC_G_PARM), valid_ioctls); |
707 | SET_VALID_IOCTL(ops, VIDIOC_S_PARM, vidioc_s_parm); | |
4b20259f HV |
708 | SET_VALID_IOCTL(ops, VIDIOC_S_DV_TIMINGS, vidioc_s_dv_timings); |
709 | SET_VALID_IOCTL(ops, VIDIOC_G_DV_TIMINGS, vidioc_g_dv_timings); | |
710 | SET_VALID_IOCTL(ops, VIDIOC_ENUM_DV_TIMINGS, vidioc_enum_dv_timings); | |
4b20259f | 711 | SET_VALID_IOCTL(ops, VIDIOC_DV_TIMINGS_CAP, vidioc_dv_timings_cap); |
dd519bb3 | 712 | SET_VALID_IOCTL(ops, VIDIOC_G_EDID, vidioc_g_edid); |
4b20259f | 713 | } |
bfffd743 HV |
714 | if (is_tx && (is_radio || is_sdr)) { |
715 | /* radio transmitter only ioctls */ | |
90d0fc49 HV |
716 | SET_VALID_IOCTL(ops, VIDIOC_G_MODULATOR, vidioc_g_modulator); |
717 | SET_VALID_IOCTL(ops, VIDIOC_S_MODULATOR, vidioc_s_modulator); | |
718 | } | |
719 | if (is_rx) { | |
720 | /* receiver only ioctls */ | |
721 | SET_VALID_IOCTL(ops, VIDIOC_G_TUNER, vidioc_g_tuner); | |
722 | SET_VALID_IOCTL(ops, VIDIOC_S_TUNER, vidioc_s_tuner); | |
723 | SET_VALID_IOCTL(ops, VIDIOC_S_HW_FREQ_SEEK, vidioc_s_hw_freq_seek); | |
724 | } | |
725 | ||
48ea0be0 HV |
726 | bitmap_andnot(vdev->valid_ioctls, valid_ioctls, vdev->valid_ioctls, |
727 | BASE_VIDIOC_PRIVATE); | |
728 | } | |
729 | ||
d9c21e3e MCC |
730 | static int video_register_media_controller(struct video_device *vdev, int type) |
731 | { | |
732 | #if defined(CONFIG_MEDIA_CONTROLLER) | |
733 | u32 intf_type; | |
734 | int ret; | |
735 | ||
736 | if (!vdev->v4l2_dev->mdev) | |
737 | return 0; | |
738 | ||
b76a2a8c | 739 | vdev->entity.obj_type = MEDIA_ENTITY_TYPE_VIDEO_DEVICE; |
4ca72efa | 740 | vdev->entity.function = MEDIA_ENT_F_UNKNOWN; |
d9c21e3e MCC |
741 | |
742 | switch (type) { | |
743 | case VFL_TYPE_GRABBER: | |
744 | intf_type = MEDIA_INTF_T_V4L_VIDEO; | |
4ca72efa | 745 | vdev->entity.function = MEDIA_ENT_F_IO_V4L; |
d9c21e3e MCC |
746 | break; |
747 | case VFL_TYPE_VBI: | |
748 | intf_type = MEDIA_INTF_T_V4L_VBI; | |
4ca72efa | 749 | vdev->entity.function = MEDIA_ENT_F_IO_VBI; |
d9c21e3e MCC |
750 | break; |
751 | case VFL_TYPE_SDR: | |
752 | intf_type = MEDIA_INTF_T_V4L_SWRADIO; | |
4ca72efa | 753 | vdev->entity.function = MEDIA_ENT_F_IO_SWRADIO; |
d9c21e3e | 754 | break; |
b2fe22d0 ND |
755 | case VFL_TYPE_TOUCH: |
756 | intf_type = MEDIA_INTF_T_V4L_TOUCH; | |
757 | vdev->entity.function = MEDIA_ENT_F_IO_V4L; | |
758 | break; | |
d9c21e3e MCC |
759 | case VFL_TYPE_RADIO: |
760 | intf_type = MEDIA_INTF_T_V4L_RADIO; | |
761 | /* | |
762 | * Radio doesn't have an entity at the V4L2 side to represent | |
763 | * radio input or output. Instead, the audio input/output goes | |
764 | * via either physical wires or ALSA. | |
765 | */ | |
766 | break; | |
767 | case VFL_TYPE_SUBDEV: | |
768 | intf_type = MEDIA_INTF_T_V4L_SUBDEV; | |
769 | /* Entity will be created via v4l2_device_register_subdev() */ | |
770 | break; | |
771 | default: | |
772 | return 0; | |
773 | } | |
774 | ||
4ca72efa | 775 | if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) { |
d9c21e3e MCC |
776 | vdev->entity.name = vdev->name; |
777 | ||
778 | /* Needed just for backward compatibility with legacy MC API */ | |
779 | vdev->entity.info.dev.major = VIDEO_MAJOR; | |
780 | vdev->entity.info.dev.minor = vdev->minor; | |
781 | ||
782 | ret = media_device_register_entity(vdev->v4l2_dev->mdev, | |
783 | &vdev->entity); | |
784 | if (ret < 0) { | |
785 | printk(KERN_WARNING | |
786 | "%s: media_device_register_entity failed\n", | |
787 | __func__); | |
788 | return ret; | |
789 | } | |
790 | } | |
791 | ||
792 | vdev->intf_devnode = media_devnode_create(vdev->v4l2_dev->mdev, | |
793 | intf_type, | |
794 | 0, VIDEO_MAJOR, | |
0b3b72df | 795 | vdev->minor); |
d9c21e3e MCC |
796 | if (!vdev->intf_devnode) { |
797 | media_device_unregister_entity(&vdev->entity); | |
798 | return -ENOMEM; | |
799 | } | |
800 | ||
4ca72efa | 801 | if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) { |
d9c21e3e MCC |
802 | struct media_link *link; |
803 | ||
804 | link = media_create_intf_link(&vdev->entity, | |
13f6e888 MCC |
805 | &vdev->intf_devnode->intf, |
806 | MEDIA_LNK_FL_ENABLED); | |
d9c21e3e MCC |
807 | if (!link) { |
808 | media_devnode_remove(vdev->intf_devnode); | |
809 | media_device_unregister_entity(&vdev->entity); | |
810 | return -ENOMEM; | |
811 | } | |
812 | } | |
813 | ||
814 | /* FIXME: how to create the other interface links? */ | |
815 | ||
816 | #endif | |
817 | return 0; | |
818 | } | |
819 | ||
2096a5dc LP |
820 | int __video_register_device(struct video_device *vdev, int type, int nr, |
821 | int warn_if_nr_in_use, struct module *owner) | |
27a5e6d3 HV |
822 | { |
823 | int i = 0; | |
27a5e6d3 | 824 | int ret; |
dd89601d HV |
825 | int minor_offset = 0; |
826 | int minor_cnt = VIDEO_NUM_DEVICES; | |
827 | const char *name_base; | |
27a5e6d3 | 828 | |
dc93a70c HV |
829 | /* A minor value of -1 marks this video device as never |
830 | having been registered */ | |
428c8d19 | 831 | vdev->minor = -1; |
ee7aa9f8 | 832 | |
dc93a70c | 833 | /* the release callback MUST be present */ |
1fc2b5f7 | 834 | if (WARN_ON(!vdev->release)) |
f3b9f50e | 835 | return -EINVAL; |
1c1d86a1 HV |
836 | /* the v4l2_dev pointer MUST be present */ |
837 | if (WARN_ON(!vdev->v4l2_dev)) | |
838 | return -EINVAL; | |
f3b9f50e | 839 | |
1babcb46 SA |
840 | /* v4l2_fh support */ |
841 | spin_lock_init(&vdev->fh_lock); | |
842 | INIT_LIST_HEAD(&vdev->fh_list); | |
843 | ||
dc93a70c | 844 | /* Part 1: check device type */ |
27a5e6d3 HV |
845 | switch (type) { |
846 | case VFL_TYPE_GRABBER: | |
27a5e6d3 HV |
847 | name_base = "video"; |
848 | break; | |
27a5e6d3 | 849 | case VFL_TYPE_VBI: |
27a5e6d3 HV |
850 | name_base = "vbi"; |
851 | break; | |
852 | case VFL_TYPE_RADIO: | |
27a5e6d3 HV |
853 | name_base = "radio"; |
854 | break; | |
2096a5dc LP |
855 | case VFL_TYPE_SUBDEV: |
856 | name_base = "v4l-subdev"; | |
857 | break; | |
d42626bd AP |
858 | case VFL_TYPE_SDR: |
859 | /* Use device name 'swradio' because 'sdr' was already taken. */ | |
860 | name_base = "swradio"; | |
861 | break; | |
b2fe22d0 ND |
862 | case VFL_TYPE_TOUCH: |
863 | name_base = "v4l-touch"; | |
864 | break; | |
27a5e6d3 HV |
865 | default: |
866 | printk(KERN_ERR "%s called with unknown type: %d\n", | |
867 | __func__, type); | |
46f2c21c | 868 | return -EINVAL; |
27a5e6d3 HV |
869 | } |
870 | ||
dc93a70c HV |
871 | vdev->vfl_type = type; |
872 | vdev->cdev = NULL; | |
1c1d86a1 HV |
873 | if (vdev->dev_parent == NULL) |
874 | vdev->dev_parent = vdev->v4l2_dev->dev; | |
875 | if (vdev->ctrl_handler == NULL) | |
876 | vdev->ctrl_handler = vdev->v4l2_dev->ctrl_handler; | |
877 | /* If the prio state pointer is NULL, then use the v4l2_device | |
878 | prio state. */ | |
879 | if (vdev->prio == NULL) | |
880 | vdev->prio = &vdev->v4l2_dev->prio; | |
dd89601d | 881 | |
22e22125 | 882 | /* Part 2: find a free minor, device node number and device index. */ |
dd89601d HV |
883 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES |
884 | /* Keep the ranges for the first four types for historical | |
885 | * reasons. | |
886 | * Newer devices (not yet in place) should use the range | |
887 | * of 128-191 and just pick the first free minor there | |
888 | * (new style). */ | |
889 | switch (type) { | |
890 | case VFL_TYPE_GRABBER: | |
891 | minor_offset = 0; | |
892 | minor_cnt = 64; | |
893 | break; | |
894 | case VFL_TYPE_RADIO: | |
895 | minor_offset = 64; | |
896 | minor_cnt = 64; | |
897 | break; | |
dd89601d HV |
898 | case VFL_TYPE_VBI: |
899 | minor_offset = 224; | |
900 | minor_cnt = 32; | |
901 | break; | |
902 | default: | |
903 | minor_offset = 128; | |
904 | minor_cnt = 64; | |
905 | break; | |
906 | } | |
907 | #endif | |
908 | ||
22e22125 | 909 | /* Pick a device node number */ |
27a5e6d3 | 910 | mutex_lock(&videodev_lock); |
5062cb70 | 911 | nr = devnode_find(vdev, nr == -1 ? 0 : nr, minor_cnt); |
dd89601d | 912 | if (nr == minor_cnt) |
5062cb70 | 913 | nr = devnode_find(vdev, 0, minor_cnt); |
dd89601d | 914 | if (nr == minor_cnt) { |
22e22125 | 915 | printk(KERN_ERR "could not get a free device node number\n"); |
dd89601d HV |
916 | mutex_unlock(&videodev_lock); |
917 | return -ENFILE; | |
27a5e6d3 | 918 | } |
dd89601d | 919 | #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES |
22e22125 | 920 | /* 1-on-1 mapping of device node number to minor number */ |
dd89601d HV |
921 | i = nr; |
922 | #else | |
22e22125 HV |
923 | /* The device node number and minor numbers are independent, so |
924 | we just find the first free minor number. */ | |
dd89601d HV |
925 | for (i = 0; i < VIDEO_NUM_DEVICES; i++) |
926 | if (video_device[i] == NULL) | |
927 | break; | |
928 | if (i == VIDEO_NUM_DEVICES) { | |
929 | mutex_unlock(&videodev_lock); | |
930 | printk(KERN_ERR "could not get a free minor\n"); | |
931 | return -ENFILE; | |
932 | } | |
933 | #endif | |
dc93a70c HV |
934 | vdev->minor = i + minor_offset; |
935 | vdev->num = nr; | |
5062cb70 HV |
936 | devnode_set(vdev); |
937 | ||
dc93a70c HV |
938 | /* Should not happen since we thought this minor was free */ |
939 | WARN_ON(video_device[vdev->minor] != NULL); | |
7ae0cd9b | 940 | vdev->index = get_index(vdev); |
6c3df5da | 941 | video_device[vdev->minor] = vdev; |
27a5e6d3 HV |
942 | mutex_unlock(&videodev_lock); |
943 | ||
48ea0be0 HV |
944 | if (vdev->ioctl_ops) |
945 | determine_valid_ioctls(vdev); | |
946 | ||
dc93a70c HV |
947 | /* Part 3: Initialize the character device */ |
948 | vdev->cdev = cdev_alloc(); | |
949 | if (vdev->cdev == NULL) { | |
950 | ret = -ENOMEM; | |
951 | goto cleanup; | |
952 | } | |
86a5ef7d | 953 | vdev->cdev->ops = &v4l2_fops; |
2096a5dc | 954 | vdev->cdev->owner = owner; |
dc93a70c | 955 | ret = cdev_add(vdev->cdev, MKDEV(VIDEO_MAJOR, vdev->minor), 1); |
7f8ecfab HV |
956 | if (ret < 0) { |
957 | printk(KERN_ERR "%s: cdev_add failed\n", __func__); | |
dc93a70c HV |
958 | kfree(vdev->cdev); |
959 | vdev->cdev = NULL; | |
960 | goto cleanup; | |
7f8ecfab | 961 | } |
dc93a70c HV |
962 | |
963 | /* Part 4: register the device with sysfs */ | |
dc93a70c HV |
964 | vdev->dev.class = &video_class; |
965 | vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor); | |
1c1d86a1 | 966 | vdev->dev.parent = vdev->dev_parent; |
22e22125 | 967 | dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num); |
dc93a70c | 968 | ret = device_register(&vdev->dev); |
27a5e6d3 HV |
969 | if (ret < 0) { |
970 | printk(KERN_ERR "%s: device_register failed\n", __func__); | |
dc93a70c | 971 | goto cleanup; |
27a5e6d3 | 972 | } |
dc93a70c HV |
973 | /* Register the release callback that will be called when the last |
974 | reference to the device goes away. */ | |
975 | vdev->dev.release = v4l2_device_release; | |
27a5e6d3 | 976 | |
6b5270d2 | 977 | if (nr != -1 && nr != vdev->num && warn_if_nr_in_use) |
eac8ea53 LP |
978 | printk(KERN_WARNING "%s: requested %s%d, got %s\n", __func__, |
979 | name_base, nr, video_device_node_name(vdev)); | |
bedf8bcf HV |
980 | |
981 | /* Increase v4l2_device refcount */ | |
d9bfbcc0 | 982 | v4l2_device_get(vdev->v4l2_dev); |
bedf8bcf | 983 | |
2c0ab67b | 984 | /* Part 5: Register the entity. */ |
d9c21e3e MCC |
985 | ret = video_register_media_controller(vdev, type); |
986 | ||
2c0ab67b | 987 | /* Part 6: Activate this minor. The char device can now be used. */ |
957b4aa9 | 988 | set_bit(V4L2_FL_REGISTERED, &vdev->flags); |
2c0ab67b | 989 | |
dc93a70c | 990 | return 0; |
7f8ecfab | 991 | |
dc93a70c | 992 | cleanup: |
27a5e6d3 | 993 | mutex_lock(&videodev_lock); |
dc93a70c HV |
994 | if (vdev->cdev) |
995 | cdev_del(vdev->cdev); | |
1056e438 | 996 | video_device[vdev->minor] = NULL; |
5062cb70 | 997 | devnode_clear(vdev); |
27a5e6d3 | 998 | mutex_unlock(&videodev_lock); |
dc93a70c HV |
999 | /* Mark this video device as never having been registered. */ |
1000 | vdev->minor = -1; | |
27a5e6d3 HV |
1001 | return ret; |
1002 | } | |
2096a5dc | 1003 | EXPORT_SYMBOL(__video_register_device); |
6b5270d2 | 1004 | |
27a5e6d3 HV |
1005 | /** |
1006 | * video_unregister_device - unregister a video4linux device | |
dc93a70c | 1007 | * @vdev: the device to unregister |
27a5e6d3 | 1008 | * |
dc93a70c HV |
1009 | * This unregisters the passed device. Future open calls will |
1010 | * be met with errors. | |
27a5e6d3 | 1011 | */ |
dc93a70c | 1012 | void video_unregister_device(struct video_device *vdev) |
27a5e6d3 | 1013 | { |
dc93a70c | 1014 | /* Check if vdev was ever registered at all */ |
957b4aa9 | 1015 | if (!vdev || !video_is_registered(vdev)) |
dc93a70c HV |
1016 | return; |
1017 | ||
ca9afe6f HV |
1018 | mutex_lock(&videodev_lock); |
1019 | /* This must be in a critical section to prevent a race with v4l2_open. | |
1020 | * Once this bit has been cleared video_get may never be called again. | |
1021 | */ | |
957b4aa9 | 1022 | clear_bit(V4L2_FL_REGISTERED, &vdev->flags); |
ca9afe6f | 1023 | mutex_unlock(&videodev_lock); |
dc93a70c | 1024 | device_unregister(&vdev->dev); |
27a5e6d3 HV |
1025 | } |
1026 | EXPORT_SYMBOL(video_unregister_device); | |
1027 | ||
27a5e6d3 HV |
1028 | /* |
1029 | * Initialise video for linux | |
1030 | */ | |
27a5e6d3 HV |
1031 | static int __init videodev_init(void) |
1032 | { | |
7f8ecfab | 1033 | dev_t dev = MKDEV(VIDEO_MAJOR, 0); |
27a5e6d3 HV |
1034 | int ret; |
1035 | ||
1036 | printk(KERN_INFO "Linux video capture interface: v2.00\n"); | |
7f8ecfab HV |
1037 | ret = register_chrdev_region(dev, VIDEO_NUM_DEVICES, VIDEO_NAME); |
1038 | if (ret < 0) { | |
1039 | printk(KERN_WARNING "videodev: unable to get major %d\n", | |
1040 | VIDEO_MAJOR); | |
1041 | return ret; | |
27a5e6d3 HV |
1042 | } |
1043 | ||
1044 | ret = class_register(&video_class); | |
1045 | if (ret < 0) { | |
7f8ecfab | 1046 | unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); |
27a5e6d3 HV |
1047 | printk(KERN_WARNING "video_dev: class_register failed\n"); |
1048 | return -EIO; | |
1049 | } | |
1050 | ||
1051 | return 0; | |
1052 | } | |
1053 | ||
1054 | static void __exit videodev_exit(void) | |
1055 | { | |
7f8ecfab HV |
1056 | dev_t dev = MKDEV(VIDEO_MAJOR, 0); |
1057 | ||
27a5e6d3 | 1058 | class_unregister(&video_class); |
7f8ecfab | 1059 | unregister_chrdev_region(dev, VIDEO_NUM_DEVICES); |
27a5e6d3 HV |
1060 | } |
1061 | ||
ee981c6f | 1062 | subsys_initcall(videodev_init); |
27a5e6d3 HV |
1063 | module_exit(videodev_exit) |
1064 | ||
1065 | MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@infradead.org>"); | |
1066 | MODULE_DESCRIPTION("Device registrar for Video4Linux drivers v2"); | |
1067 | MODULE_LICENSE("GPL"); | |
cbb72b0f | 1068 | MODULE_ALIAS_CHARDEV_MAJOR(VIDEO_MAJOR); |