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Merge branches 'fixes' and 'ioremap' into for-linus
[deliverable/linux.git] / drivers / media / v4l2-core / v4l2-dev.c
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 *
12 * Authors: Alan Cox, <alan@lxorguk.ukuu.org.uk> (version 1)
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>
28 #include <asm/uaccess.h>
29
30 #include <media/v4l2-common.h>
31 #include <media/v4l2-device.h>
32 #include <media/v4l2-ioctl.h>
33
34 #define VIDEO_NUM_DEVICES 256
35 #define VIDEO_NAME "video4linux"
36
37 /*
38 * sysfs stuff
39 */
40
41 static ssize_t index_show(struct device *cd,
42 struct device_attribute *attr, char *buf)
43 {
44 struct video_device *vdev = to_video_device(cd);
45
46 return sprintf(buf, "%i\n", vdev->index);
47 }
48 static DEVICE_ATTR_RO(index);
49
50 static ssize_t dev_debug_show(struct device *cd,
51 struct device_attribute *attr, char *buf)
52 {
53 struct video_device *vdev = to_video_device(cd);
54
55 return sprintf(buf, "%i\n", vdev->dev_debug);
56 }
57
58 static ssize_t dev_debug_store(struct device *cd, struct device_attribute *attr,
59 const char *buf, size_t len)
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->dev_debug = value;
70 return len;
71 }
72 static DEVICE_ATTR_RW(dev_debug);
73
74 static ssize_t name_show(struct device *cd,
75 struct device_attribute *attr, char *buf)
76 {
77 struct video_device *vdev = to_video_device(cd);
78
79 return sprintf(buf, "%.*s\n", (int)sizeof(vdev->name), vdev->name);
80 }
81 static DEVICE_ATTR_RO(name);
82
83 static struct attribute *video_device_attrs[] = {
84 &dev_attr_name.attr,
85 &dev_attr_dev_debug.attr,
86 &dev_attr_index.attr,
87 NULL,
88 };
89 ATTRIBUTE_GROUPS(video_device);
90
91 /*
92 * Active devices
93 */
94 static struct video_device *video_device[VIDEO_NUM_DEVICES];
95 static DEFINE_MUTEX(videodev_lock);
96 static DECLARE_BITMAP(devnode_nums[VFL_TYPE_MAX], VIDEO_NUM_DEVICES);
97
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. */
110 int idx = (vfl_type > VFL_TYPE_RADIO) ? VFL_TYPE_MAX - 1 : vfl_type;
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
140 struct video_device *video_device_alloc(void)
141 {
142 return kzalloc(sizeof(struct video_device), GFP_KERNEL);
143 }
144 EXPORT_SYMBOL(video_device_alloc);
145
146 void video_device_release(struct video_device *vdev)
147 {
148 kfree(vdev);
149 }
150 EXPORT_SYMBOL(video_device_release);
151
152 void video_device_release_empty(struct video_device *vdev)
153 {
154 /* Do nothing */
155 /* Only valid when the video_device struct is a static. */
156 }
157 EXPORT_SYMBOL(video_device_release_empty);
158
159 static inline void video_get(struct video_device *vdev)
160 {
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);
173 struct v4l2_device *v4l2_dev = vdev->v4l2_dev;
174
175 mutex_lock(&videodev_lock);
176 if (WARN_ON(video_device[vdev->minor] != vdev)) {
177 /* should not happen */
178 mutex_unlock(&videodev_lock);
179 return;
180 }
181
182 /* Free up this device for reuse */
183 video_device[vdev->minor] = NULL;
184
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;
190
191 /* Mark device node number as free */
192 devnode_clear(vdev);
193
194 mutex_unlock(&videodev_lock);
195
196 #if defined(CONFIG_MEDIA_CONTROLLER)
197 if (v4l2_dev->mdev &&
198 vdev->vfl_type != VFL_TYPE_SUBDEV)
199 media_device_unregister_entity(&vdev->entity);
200 #endif
201
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 */
210 if (v4l2_dev->release == NULL)
211 v4l2_dev = NULL;
212
213 /* Release video_device and perform other
214 cleanups as needed. */
215 vdev->release(vdev);
216
217 /* Decrease v4l2_device refcount */
218 if (v4l2_dev)
219 v4l2_device_put(v4l2_dev);
220 }
221
222 static struct class video_class = {
223 .name = VIDEO_NAME,
224 .dev_groups = video_device_groups,
225 };
226
227 struct video_device *video_devdata(struct file *file)
228 {
229 return video_device[iminor(file_inode(file))];
230 }
231 EXPORT_SYMBOL(video_devdata);
232
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
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);
301 int ret = -ENODEV;
302
303 if (!vdev->fops->read)
304 return -EINVAL;
305 if (video_is_registered(vdev))
306 ret = vdev->fops->read(filp, buf, sz, off);
307 if ((vdev->dev_debug & V4L2_DEV_DEBUG_FOP) &&
308 (vdev->dev_debug & V4L2_DEV_DEBUG_STREAMING))
309 printk(KERN_DEBUG "%s: read: %zd (%d)\n",
310 video_device_node_name(vdev), sz, ret);
311 return ret;
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);
318 int ret = -ENODEV;
319
320 if (!vdev->fops->write)
321 return -EINVAL;
322 if (video_is_registered(vdev))
323 ret = vdev->fops->write(filp, buf, sz, off);
324 if ((vdev->dev_debug & V4L2_DEV_DEBUG_FOP) &&
325 (vdev->dev_debug & V4L2_DEV_DEBUG_STREAMING))
326 printk(KERN_DEBUG "%s: write: %zd (%d)\n",
327 video_device_node_name(vdev), sz, ret);
328 return ret;
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);
334 unsigned int res = POLLERR | POLLHUP;
335
336 if (!vdev->fops->poll)
337 return DEFAULT_POLLMASK;
338 if (video_is_registered(vdev))
339 res = vdev->fops->poll(filp, poll);
340 if (vdev->dev_debug & V4L2_DEV_DEBUG_POLL)
341 printk(KERN_DEBUG "%s: poll: %08x\n",
342 video_device_node_name(vdev), res);
343 return res;
344 }
345
346 static long v4l2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
347 {
348 struct video_device *vdev = video_devdata(filp);
349 int ret = -ENODEV;
350
351 if (vdev->fops->unlocked_ioctl) {
352 struct mutex *lock = v4l2_ioctl_get_lock(vdev, cmd);
353
354 if (lock && mutex_lock_interruptible(lock))
355 return -ERESTARTSYS;
356 if (video_is_registered(vdev))
357 ret = vdev->fops->unlocked_ioctl(filp, cmd, arg);
358 if (lock)
359 mutex_unlock(lock);
360 } else
361 ret = -ENOTTY;
362
363 return ret;
364 }
365
366 #ifdef CONFIG_MMU
367 #define v4l2_get_unmapped_area NULL
368 #else
369 static unsigned long v4l2_get_unmapped_area(struct file *filp,
370 unsigned long addr, unsigned long len, unsigned long pgoff,
371 unsigned long flags)
372 {
373 struct video_device *vdev = video_devdata(filp);
374 int ret;
375
376 if (!vdev->fops->get_unmapped_area)
377 return -ENOSYS;
378 if (!video_is_registered(vdev))
379 return -ENODEV;
380 ret = vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags);
381 if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP)
382 printk(KERN_DEBUG "%s: get_unmapped_area (%d)\n",
383 video_device_node_name(vdev), ret);
384 return ret;
385 }
386 #endif
387
388 static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm)
389 {
390 struct video_device *vdev = video_devdata(filp);
391 int ret = -ENODEV;
392
393 if (!vdev->fops->mmap)
394 return -ENODEV;
395 if (video_is_registered(vdev))
396 ret = vdev->fops->mmap(filp, vm);
397 if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP)
398 printk(KERN_DEBUG "%s: mmap (%d)\n",
399 video_device_node_name(vdev), ret);
400 return ret;
401 }
402
403 /* Override for the open function */
404 static int v4l2_open(struct inode *inode, struct file *filp)
405 {
406 struct video_device *vdev;
407 int ret = 0;
408
409 /* Check if the video device is available */
410 mutex_lock(&videodev_lock);
411 vdev = video_devdata(filp);
412 /* return ENODEV if the video device has already been removed. */
413 if (vdev == NULL || !video_is_registered(vdev)) {
414 mutex_unlock(&videodev_lock);
415 return -ENODEV;
416 }
417 /* and increase the device refcount */
418 video_get(vdev);
419 mutex_unlock(&videodev_lock);
420 if (vdev->fops->open) {
421 if (video_is_registered(vdev))
422 ret = vdev->fops->open(filp);
423 else
424 ret = -ENODEV;
425 }
426
427 if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP)
428 printk(KERN_DEBUG "%s: open (%d)\n",
429 video_device_node_name(vdev), ret);
430 /* decrease the refcount in case of an error */
431 if (ret)
432 video_put(vdev);
433 return ret;
434 }
435
436 /* Override for the release function */
437 static int v4l2_release(struct inode *inode, struct file *filp)
438 {
439 struct video_device *vdev = video_devdata(filp);
440 int ret = 0;
441
442 if (vdev->fops->release)
443 ret = vdev->fops->release(filp);
444 if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP)
445 printk(KERN_DEBUG "%s: release\n",
446 video_device_node_name(vdev));
447
448 /* decrease the refcount unconditionally since the release()
449 return value is ignored. */
450 video_put(vdev);
451 return ret;
452 }
453
454 static const struct file_operations v4l2_fops = {
455 .owner = THIS_MODULE,
456 .read = v4l2_read,
457 .write = v4l2_write,
458 .open = v4l2_open,
459 .get_unmapped_area = v4l2_get_unmapped_area,
460 .mmap = v4l2_mmap,
461 .unlocked_ioctl = v4l2_ioctl,
462 #ifdef CONFIG_COMPAT
463 .compat_ioctl = v4l2_compat_ioctl32,
464 #endif
465 .release = v4l2_release,
466 .poll = v4l2_poll,
467 .llseek = no_llseek,
468 };
469
470 /**
471 * get_index - assign stream index number based on v4l2_dev
472 * @vdev: video_device to assign index number to, vdev->v4l2_dev should be assigned
473 *
474 * Note that when this is called the new device has not yet been registered
475 * in the video_device array, but it was able to obtain a minor number.
476 *
477 * This means that we can always obtain a free stream index number since
478 * the worst case scenario is that there are VIDEO_NUM_DEVICES - 1 slots in
479 * use of the video_device array.
480 *
481 * Returns a free index number.
482 */
483 static int get_index(struct video_device *vdev)
484 {
485 /* This can be static since this function is called with the global
486 videodev_lock held. */
487 static DECLARE_BITMAP(used, VIDEO_NUM_DEVICES);
488 int i;
489
490 bitmap_zero(used, VIDEO_NUM_DEVICES);
491
492 for (i = 0; i < VIDEO_NUM_DEVICES; i++) {
493 if (video_device[i] != NULL &&
494 video_device[i]->v4l2_dev == vdev->v4l2_dev) {
495 set_bit(video_device[i]->index, used);
496 }
497 }
498
499 return find_first_zero_bit(used, VIDEO_NUM_DEVICES);
500 }
501
502 #define SET_VALID_IOCTL(ops, cmd, op) \
503 if (ops->op) \
504 set_bit(_IOC_NR(cmd), valid_ioctls)
505
506 /* This determines which ioctls are actually implemented in the driver.
507 It's a one-time thing which simplifies video_ioctl2 as it can just do
508 a bit test.
509
510 Note that drivers can override this by setting bits to 1 in
511 vdev->valid_ioctls. If an ioctl is marked as 1 when this function is
512 called, then that ioctl will actually be marked as unimplemented.
513
514 It does that by first setting up the local valid_ioctls bitmap, and
515 at the end do a:
516
517 vdev->valid_ioctls = valid_ioctls & ~(vdev->valid_ioctls)
518 */
519 static void determine_valid_ioctls(struct video_device *vdev)
520 {
521 DECLARE_BITMAP(valid_ioctls, BASE_VIDIOC_PRIVATE);
522 const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops;
523 bool is_vid = vdev->vfl_type == VFL_TYPE_GRABBER;
524 bool is_vbi = vdev->vfl_type == VFL_TYPE_VBI;
525 bool is_radio = vdev->vfl_type == VFL_TYPE_RADIO;
526 bool is_sdr = vdev->vfl_type == VFL_TYPE_SDR;
527 bool is_rx = vdev->vfl_dir != VFL_DIR_TX;
528 bool is_tx = vdev->vfl_dir != VFL_DIR_RX;
529
530 bitmap_zero(valid_ioctls, BASE_VIDIOC_PRIVATE);
531
532 /* vfl_type and vfl_dir independent ioctls */
533
534 SET_VALID_IOCTL(ops, VIDIOC_QUERYCAP, vidioc_querycap);
535 set_bit(_IOC_NR(VIDIOC_G_PRIORITY), valid_ioctls);
536 set_bit(_IOC_NR(VIDIOC_S_PRIORITY), valid_ioctls);
537
538 /* Note: the control handler can also be passed through the filehandle,
539 and that can't be tested here. If the bit for these control ioctls
540 is set, then the ioctl is valid. But if it is 0, then it can still
541 be valid if the filehandle passed the control handler. */
542 if (vdev->ctrl_handler || ops->vidioc_queryctrl)
543 set_bit(_IOC_NR(VIDIOC_QUERYCTRL), valid_ioctls);
544 if (vdev->ctrl_handler || ops->vidioc_query_ext_ctrl)
545 set_bit(_IOC_NR(VIDIOC_QUERY_EXT_CTRL), valid_ioctls);
546 if (vdev->ctrl_handler || ops->vidioc_g_ctrl || ops->vidioc_g_ext_ctrls)
547 set_bit(_IOC_NR(VIDIOC_G_CTRL), valid_ioctls);
548 if (vdev->ctrl_handler || ops->vidioc_s_ctrl || ops->vidioc_s_ext_ctrls)
549 set_bit(_IOC_NR(VIDIOC_S_CTRL), valid_ioctls);
550 if (vdev->ctrl_handler || ops->vidioc_g_ext_ctrls)
551 set_bit(_IOC_NR(VIDIOC_G_EXT_CTRLS), valid_ioctls);
552 if (vdev->ctrl_handler || ops->vidioc_s_ext_ctrls)
553 set_bit(_IOC_NR(VIDIOC_S_EXT_CTRLS), valid_ioctls);
554 if (vdev->ctrl_handler || ops->vidioc_try_ext_ctrls)
555 set_bit(_IOC_NR(VIDIOC_TRY_EXT_CTRLS), valid_ioctls);
556 if (vdev->ctrl_handler || ops->vidioc_querymenu)
557 set_bit(_IOC_NR(VIDIOC_QUERYMENU), valid_ioctls);
558 SET_VALID_IOCTL(ops, VIDIOC_G_FREQUENCY, vidioc_g_frequency);
559 SET_VALID_IOCTL(ops, VIDIOC_S_FREQUENCY, vidioc_s_frequency);
560 SET_VALID_IOCTL(ops, VIDIOC_LOG_STATUS, vidioc_log_status);
561 #ifdef CONFIG_VIDEO_ADV_DEBUG
562 set_bit(_IOC_NR(VIDIOC_DBG_G_CHIP_INFO), valid_ioctls);
563 set_bit(_IOC_NR(VIDIOC_DBG_G_REGISTER), valid_ioctls);
564 set_bit(_IOC_NR(VIDIOC_DBG_S_REGISTER), valid_ioctls);
565 #endif
566 /* yes, really vidioc_subscribe_event */
567 SET_VALID_IOCTL(ops, VIDIOC_DQEVENT, vidioc_subscribe_event);
568 SET_VALID_IOCTL(ops, VIDIOC_SUBSCRIBE_EVENT, vidioc_subscribe_event);
569 SET_VALID_IOCTL(ops, VIDIOC_UNSUBSCRIBE_EVENT, vidioc_unsubscribe_event);
570 if (ops->vidioc_enum_freq_bands || ops->vidioc_g_tuner || ops->vidioc_g_modulator)
571 set_bit(_IOC_NR(VIDIOC_ENUM_FREQ_BANDS), valid_ioctls);
572
573 if (is_vid) {
574 /* video specific ioctls */
575 if ((is_rx && (ops->vidioc_enum_fmt_vid_cap ||
576 ops->vidioc_enum_fmt_vid_cap_mplane ||
577 ops->vidioc_enum_fmt_vid_overlay)) ||
578 (is_tx && (ops->vidioc_enum_fmt_vid_out ||
579 ops->vidioc_enum_fmt_vid_out_mplane)))
580 set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls);
581 if ((is_rx && (ops->vidioc_g_fmt_vid_cap ||
582 ops->vidioc_g_fmt_vid_cap_mplane ||
583 ops->vidioc_g_fmt_vid_overlay)) ||
584 (is_tx && (ops->vidioc_g_fmt_vid_out ||
585 ops->vidioc_g_fmt_vid_out_mplane ||
586 ops->vidioc_g_fmt_vid_out_overlay)))
587 set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls);
588 if ((is_rx && (ops->vidioc_s_fmt_vid_cap ||
589 ops->vidioc_s_fmt_vid_cap_mplane ||
590 ops->vidioc_s_fmt_vid_overlay)) ||
591 (is_tx && (ops->vidioc_s_fmt_vid_out ||
592 ops->vidioc_s_fmt_vid_out_mplane ||
593 ops->vidioc_s_fmt_vid_out_overlay)))
594 set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls);
595 if ((is_rx && (ops->vidioc_try_fmt_vid_cap ||
596 ops->vidioc_try_fmt_vid_cap_mplane ||
597 ops->vidioc_try_fmt_vid_overlay)) ||
598 (is_tx && (ops->vidioc_try_fmt_vid_out ||
599 ops->vidioc_try_fmt_vid_out_mplane ||
600 ops->vidioc_try_fmt_vid_out_overlay)))
601 set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls);
602 SET_VALID_IOCTL(ops, VIDIOC_OVERLAY, vidioc_overlay);
603 SET_VALID_IOCTL(ops, VIDIOC_G_FBUF, vidioc_g_fbuf);
604 SET_VALID_IOCTL(ops, VIDIOC_S_FBUF, vidioc_s_fbuf);
605 SET_VALID_IOCTL(ops, VIDIOC_G_JPEGCOMP, vidioc_g_jpegcomp);
606 SET_VALID_IOCTL(ops, VIDIOC_S_JPEGCOMP, vidioc_s_jpegcomp);
607 SET_VALID_IOCTL(ops, VIDIOC_G_ENC_INDEX, vidioc_g_enc_index);
608 SET_VALID_IOCTL(ops, VIDIOC_ENCODER_CMD, vidioc_encoder_cmd);
609 SET_VALID_IOCTL(ops, VIDIOC_TRY_ENCODER_CMD, vidioc_try_encoder_cmd);
610 SET_VALID_IOCTL(ops, VIDIOC_DECODER_CMD, vidioc_decoder_cmd);
611 SET_VALID_IOCTL(ops, VIDIOC_TRY_DECODER_CMD, vidioc_try_decoder_cmd);
612 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes);
613 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals);
614 if (ops->vidioc_g_crop || ops->vidioc_g_selection)
615 set_bit(_IOC_NR(VIDIOC_G_CROP), valid_ioctls);
616 if (ops->vidioc_s_crop || ops->vidioc_s_selection)
617 set_bit(_IOC_NR(VIDIOC_S_CROP), valid_ioctls);
618 SET_VALID_IOCTL(ops, VIDIOC_G_SELECTION, vidioc_g_selection);
619 SET_VALID_IOCTL(ops, VIDIOC_S_SELECTION, vidioc_s_selection);
620 if (ops->vidioc_cropcap || ops->vidioc_g_selection)
621 set_bit(_IOC_NR(VIDIOC_CROPCAP), valid_ioctls);
622 } else if (is_vbi) {
623 /* vbi specific ioctls */
624 if ((is_rx && (ops->vidioc_g_fmt_vbi_cap ||
625 ops->vidioc_g_fmt_sliced_vbi_cap)) ||
626 (is_tx && (ops->vidioc_g_fmt_vbi_out ||
627 ops->vidioc_g_fmt_sliced_vbi_out)))
628 set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls);
629 if ((is_rx && (ops->vidioc_s_fmt_vbi_cap ||
630 ops->vidioc_s_fmt_sliced_vbi_cap)) ||
631 (is_tx && (ops->vidioc_s_fmt_vbi_out ||
632 ops->vidioc_s_fmt_sliced_vbi_out)))
633 set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls);
634 if ((is_rx && (ops->vidioc_try_fmt_vbi_cap ||
635 ops->vidioc_try_fmt_sliced_vbi_cap)) ||
636 (is_tx && (ops->vidioc_try_fmt_vbi_out ||
637 ops->vidioc_try_fmt_sliced_vbi_out)))
638 set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls);
639 SET_VALID_IOCTL(ops, VIDIOC_G_SLICED_VBI_CAP, vidioc_g_sliced_vbi_cap);
640 } else if (is_sdr) {
641 /* SDR specific ioctls */
642 if (ops->vidioc_enum_fmt_sdr_cap)
643 set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls);
644 if (ops->vidioc_g_fmt_sdr_cap)
645 set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls);
646 if (ops->vidioc_s_fmt_sdr_cap)
647 set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls);
648 if (ops->vidioc_try_fmt_sdr_cap)
649 set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls);
650 }
651
652 if (is_vid || is_vbi || is_sdr) {
653 /* ioctls valid for video, vbi or sdr */
654 SET_VALID_IOCTL(ops, VIDIOC_REQBUFS, vidioc_reqbufs);
655 SET_VALID_IOCTL(ops, VIDIOC_QUERYBUF, vidioc_querybuf);
656 SET_VALID_IOCTL(ops, VIDIOC_QBUF, vidioc_qbuf);
657 SET_VALID_IOCTL(ops, VIDIOC_EXPBUF, vidioc_expbuf);
658 SET_VALID_IOCTL(ops, VIDIOC_DQBUF, vidioc_dqbuf);
659 SET_VALID_IOCTL(ops, VIDIOC_CREATE_BUFS, vidioc_create_bufs);
660 SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, vidioc_prepare_buf);
661 SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon);
662 SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff);
663 }
664
665 if (is_vid || is_vbi) {
666 /* ioctls valid for video or vbi */
667 if (ops->vidioc_s_std)
668 set_bit(_IOC_NR(VIDIOC_ENUMSTD), valid_ioctls);
669 SET_VALID_IOCTL(ops, VIDIOC_S_STD, vidioc_s_std);
670 SET_VALID_IOCTL(ops, VIDIOC_G_STD, vidioc_g_std);
671 if (is_rx) {
672 SET_VALID_IOCTL(ops, VIDIOC_QUERYSTD, vidioc_querystd);
673 SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input);
674 SET_VALID_IOCTL(ops, VIDIOC_G_INPUT, vidioc_g_input);
675 SET_VALID_IOCTL(ops, VIDIOC_S_INPUT, vidioc_s_input);
676 SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDIO, vidioc_enumaudio);
677 SET_VALID_IOCTL(ops, VIDIOC_G_AUDIO, vidioc_g_audio);
678 SET_VALID_IOCTL(ops, VIDIOC_S_AUDIO, vidioc_s_audio);
679 SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings);
680 SET_VALID_IOCTL(ops, VIDIOC_S_EDID, vidioc_s_edid);
681 }
682 if (is_tx) {
683 SET_VALID_IOCTL(ops, VIDIOC_ENUMOUTPUT, vidioc_enum_output);
684 SET_VALID_IOCTL(ops, VIDIOC_G_OUTPUT, vidioc_g_output);
685 SET_VALID_IOCTL(ops, VIDIOC_S_OUTPUT, vidioc_s_output);
686 SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDOUT, vidioc_enumaudout);
687 SET_VALID_IOCTL(ops, VIDIOC_G_AUDOUT, vidioc_g_audout);
688 SET_VALID_IOCTL(ops, VIDIOC_S_AUDOUT, vidioc_s_audout);
689 }
690 if (ops->vidioc_g_parm || (vdev->vfl_type == VFL_TYPE_GRABBER &&
691 ops->vidioc_g_std))
692 set_bit(_IOC_NR(VIDIOC_G_PARM), valid_ioctls);
693 SET_VALID_IOCTL(ops, VIDIOC_S_PARM, vidioc_s_parm);
694 SET_VALID_IOCTL(ops, VIDIOC_S_DV_TIMINGS, vidioc_s_dv_timings);
695 SET_VALID_IOCTL(ops, VIDIOC_G_DV_TIMINGS, vidioc_g_dv_timings);
696 SET_VALID_IOCTL(ops, VIDIOC_ENUM_DV_TIMINGS, vidioc_enum_dv_timings);
697 SET_VALID_IOCTL(ops, VIDIOC_DV_TIMINGS_CAP, vidioc_dv_timings_cap);
698 SET_VALID_IOCTL(ops, VIDIOC_G_EDID, vidioc_g_edid);
699 }
700 if (is_tx && (is_radio || is_sdr)) {
701 /* radio transmitter only ioctls */
702 SET_VALID_IOCTL(ops, VIDIOC_G_MODULATOR, vidioc_g_modulator);
703 SET_VALID_IOCTL(ops, VIDIOC_S_MODULATOR, vidioc_s_modulator);
704 }
705 if (is_rx) {
706 /* receiver only ioctls */
707 SET_VALID_IOCTL(ops, VIDIOC_G_TUNER, vidioc_g_tuner);
708 SET_VALID_IOCTL(ops, VIDIOC_S_TUNER, vidioc_s_tuner);
709 SET_VALID_IOCTL(ops, VIDIOC_S_HW_FREQ_SEEK, vidioc_s_hw_freq_seek);
710 }
711
712 bitmap_andnot(vdev->valid_ioctls, valid_ioctls, vdev->valid_ioctls,
713 BASE_VIDIOC_PRIVATE);
714 }
715
716 /**
717 * __video_register_device - register video4linux devices
718 * @vdev: video device structure we want to register
719 * @type: type of device to register
720 * @nr: which device node number (0 == /dev/video0, 1 == /dev/video1, ...
721 * -1 == first free)
722 * @warn_if_nr_in_use: warn if the desired device node number
723 * was already in use and another number was chosen instead.
724 * @owner: module that owns the video device node
725 *
726 * The registration code assigns minor numbers and device node numbers
727 * based on the requested type and registers the new device node with
728 * the kernel.
729 *
730 * This function assumes that struct video_device was zeroed when it
731 * was allocated and does not contain any stale date.
732 *
733 * An error is returned if no free minor or device node number could be
734 * found, or if the registration of the device node failed.
735 *
736 * Zero is returned on success.
737 *
738 * Valid types are
739 *
740 * %VFL_TYPE_GRABBER - A frame grabber
741 *
742 * %VFL_TYPE_VBI - Vertical blank data (undecoded)
743 *
744 * %VFL_TYPE_RADIO - A radio card
745 *
746 * %VFL_TYPE_SUBDEV - A subdevice
747 *
748 * %VFL_TYPE_SDR - Software Defined Radio
749 */
750 int __video_register_device(struct video_device *vdev, int type, int nr,
751 int warn_if_nr_in_use, struct module *owner)
752 {
753 int i = 0;
754 int ret;
755 int minor_offset = 0;
756 int minor_cnt = VIDEO_NUM_DEVICES;
757 const char *name_base;
758
759 /* A minor value of -1 marks this video device as never
760 having been registered */
761 vdev->minor = -1;
762
763 /* the release callback MUST be present */
764 if (WARN_ON(!vdev->release))
765 return -EINVAL;
766 /* the v4l2_dev pointer MUST be present */
767 if (WARN_ON(!vdev->v4l2_dev))
768 return -EINVAL;
769
770 /* v4l2_fh support */
771 spin_lock_init(&vdev->fh_lock);
772 INIT_LIST_HEAD(&vdev->fh_list);
773
774 /* Part 1: check device type */
775 switch (type) {
776 case VFL_TYPE_GRABBER:
777 name_base = "video";
778 break;
779 case VFL_TYPE_VBI:
780 name_base = "vbi";
781 break;
782 case VFL_TYPE_RADIO:
783 name_base = "radio";
784 break;
785 case VFL_TYPE_SUBDEV:
786 name_base = "v4l-subdev";
787 break;
788 case VFL_TYPE_SDR:
789 /* Use device name 'swradio' because 'sdr' was already taken. */
790 name_base = "swradio";
791 break;
792 default:
793 printk(KERN_ERR "%s called with unknown type: %d\n",
794 __func__, type);
795 return -EINVAL;
796 }
797
798 vdev->vfl_type = type;
799 vdev->cdev = NULL;
800 if (vdev->dev_parent == NULL)
801 vdev->dev_parent = vdev->v4l2_dev->dev;
802 if (vdev->ctrl_handler == NULL)
803 vdev->ctrl_handler = vdev->v4l2_dev->ctrl_handler;
804 /* If the prio state pointer is NULL, then use the v4l2_device
805 prio state. */
806 if (vdev->prio == NULL)
807 vdev->prio = &vdev->v4l2_dev->prio;
808
809 /* Part 2: find a free minor, device node number and device index. */
810 #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES
811 /* Keep the ranges for the first four types for historical
812 * reasons.
813 * Newer devices (not yet in place) should use the range
814 * of 128-191 and just pick the first free minor there
815 * (new style). */
816 switch (type) {
817 case VFL_TYPE_GRABBER:
818 minor_offset = 0;
819 minor_cnt = 64;
820 break;
821 case VFL_TYPE_RADIO:
822 minor_offset = 64;
823 minor_cnt = 64;
824 break;
825 case VFL_TYPE_VBI:
826 minor_offset = 224;
827 minor_cnt = 32;
828 break;
829 default:
830 minor_offset = 128;
831 minor_cnt = 64;
832 break;
833 }
834 #endif
835
836 /* Pick a device node number */
837 mutex_lock(&videodev_lock);
838 nr = devnode_find(vdev, nr == -1 ? 0 : nr, minor_cnt);
839 if (nr == minor_cnt)
840 nr = devnode_find(vdev, 0, minor_cnt);
841 if (nr == minor_cnt) {
842 printk(KERN_ERR "could not get a free device node number\n");
843 mutex_unlock(&videodev_lock);
844 return -ENFILE;
845 }
846 #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES
847 /* 1-on-1 mapping of device node number to minor number */
848 i = nr;
849 #else
850 /* The device node number and minor numbers are independent, so
851 we just find the first free minor number. */
852 for (i = 0; i < VIDEO_NUM_DEVICES; i++)
853 if (video_device[i] == NULL)
854 break;
855 if (i == VIDEO_NUM_DEVICES) {
856 mutex_unlock(&videodev_lock);
857 printk(KERN_ERR "could not get a free minor\n");
858 return -ENFILE;
859 }
860 #endif
861 vdev->minor = i + minor_offset;
862 vdev->num = nr;
863 devnode_set(vdev);
864
865 /* Should not happen since we thought this minor was free */
866 WARN_ON(video_device[vdev->minor] != NULL);
867 vdev->index = get_index(vdev);
868 video_device[vdev->minor] = vdev;
869 mutex_unlock(&videodev_lock);
870
871 if (vdev->ioctl_ops)
872 determine_valid_ioctls(vdev);
873
874 /* Part 3: Initialize the character device */
875 vdev->cdev = cdev_alloc();
876 if (vdev->cdev == NULL) {
877 ret = -ENOMEM;
878 goto cleanup;
879 }
880 vdev->cdev->ops = &v4l2_fops;
881 vdev->cdev->owner = owner;
882 ret = cdev_add(vdev->cdev, MKDEV(VIDEO_MAJOR, vdev->minor), 1);
883 if (ret < 0) {
884 printk(KERN_ERR "%s: cdev_add failed\n", __func__);
885 kfree(vdev->cdev);
886 vdev->cdev = NULL;
887 goto cleanup;
888 }
889
890 /* Part 4: register the device with sysfs */
891 vdev->dev.class = &video_class;
892 vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor);
893 vdev->dev.parent = vdev->dev_parent;
894 dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num);
895 ret = device_register(&vdev->dev);
896 if (ret < 0) {
897 printk(KERN_ERR "%s: device_register failed\n", __func__);
898 goto cleanup;
899 }
900 /* Register the release callback that will be called when the last
901 reference to the device goes away. */
902 vdev->dev.release = v4l2_device_release;
903
904 if (nr != -1 && nr != vdev->num && warn_if_nr_in_use)
905 printk(KERN_WARNING "%s: requested %s%d, got %s\n", __func__,
906 name_base, nr, video_device_node_name(vdev));
907
908 /* Increase v4l2_device refcount */
909 v4l2_device_get(vdev->v4l2_dev);
910
911 #if defined(CONFIG_MEDIA_CONTROLLER)
912 /* Part 5: Register the entity. */
913 if (vdev->v4l2_dev->mdev &&
914 vdev->vfl_type != VFL_TYPE_SUBDEV) {
915 vdev->entity.type = MEDIA_ENT_T_DEVNODE_V4L;
916 vdev->entity.name = vdev->name;
917 vdev->entity.info.dev.major = VIDEO_MAJOR;
918 vdev->entity.info.dev.minor = vdev->minor;
919 ret = media_device_register_entity(vdev->v4l2_dev->mdev,
920 &vdev->entity);
921 if (ret < 0)
922 printk(KERN_WARNING
923 "%s: media_device_register_entity failed\n",
924 __func__);
925 }
926 #endif
927 /* Part 6: Activate this minor. The char device can now be used. */
928 set_bit(V4L2_FL_REGISTERED, &vdev->flags);
929
930 return 0;
931
932 cleanup:
933 mutex_lock(&videodev_lock);
934 if (vdev->cdev)
935 cdev_del(vdev->cdev);
936 video_device[vdev->minor] = NULL;
937 devnode_clear(vdev);
938 mutex_unlock(&videodev_lock);
939 /* Mark this video device as never having been registered. */
940 vdev->minor = -1;
941 return ret;
942 }
943 EXPORT_SYMBOL(__video_register_device);
944
945 /**
946 * video_unregister_device - unregister a video4linux device
947 * @vdev: the device to unregister
948 *
949 * This unregisters the passed device. Future open calls will
950 * be met with errors.
951 */
952 void video_unregister_device(struct video_device *vdev)
953 {
954 /* Check if vdev was ever registered at all */
955 if (!vdev || !video_is_registered(vdev))
956 return;
957
958 mutex_lock(&videodev_lock);
959 /* This must be in a critical section to prevent a race with v4l2_open.
960 * Once this bit has been cleared video_get may never be called again.
961 */
962 clear_bit(V4L2_FL_REGISTERED, &vdev->flags);
963 mutex_unlock(&videodev_lock);
964 device_unregister(&vdev->dev);
965 }
966 EXPORT_SYMBOL(video_unregister_device);
967
968 /*
969 * Initialise video for linux
970 */
971 static int __init videodev_init(void)
972 {
973 dev_t dev = MKDEV(VIDEO_MAJOR, 0);
974 int ret;
975
976 printk(KERN_INFO "Linux video capture interface: v2.00\n");
977 ret = register_chrdev_region(dev, VIDEO_NUM_DEVICES, VIDEO_NAME);
978 if (ret < 0) {
979 printk(KERN_WARNING "videodev: unable to get major %d\n",
980 VIDEO_MAJOR);
981 return ret;
982 }
983
984 ret = class_register(&video_class);
985 if (ret < 0) {
986 unregister_chrdev_region(dev, VIDEO_NUM_DEVICES);
987 printk(KERN_WARNING "video_dev: class_register failed\n");
988 return -EIO;
989 }
990
991 return 0;
992 }
993
994 static void __exit videodev_exit(void)
995 {
996 dev_t dev = MKDEV(VIDEO_MAJOR, 0);
997
998 class_unregister(&video_class);
999 unregister_chrdev_region(dev, VIDEO_NUM_DEVICES);
1000 }
1001
1002 subsys_initcall(videodev_init);
1003 module_exit(videodev_exit)
1004
1005 MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@infradead.org>");
1006 MODULE_DESCRIPTION("Device registrar for Video4Linux drivers v2");
1007 MODULE_LICENSE("GPL");
1008 MODULE_ALIAS_CHARDEV_MAJOR(VIDEO_MAJOR);
Linux kernel - Deliverables
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