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Merge remote-tracking branch 'iommu/next'
[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 /* Remove interfaces and interface links */
199 media_devnode_remove(vdev->intf_devnode);
200 if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN)
201 media_device_unregister_entity(&vdev->entity);
202 }
203 #endif
204
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 */
213 if (v4l2_dev->release == NULL)
214 v4l2_dev = NULL;
215
216 /* Release video_device and perform other
217 cleanups as needed. */
218 vdev->release(vdev);
219
220 /* Decrease v4l2_device refcount */
221 if (v4l2_dev)
222 v4l2_device_put(v4l2_dev);
223 }
224
225 static struct class video_class = {
226 .name = VIDEO_NAME,
227 .dev_groups = video_device_groups,
228 };
229
230 struct video_device *video_devdata(struct file *file)
231 {
232 return video_device[iminor(file_inode(file))];
233 }
234 EXPORT_SYMBOL(video_devdata);
235
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
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);
304 int ret = -ENODEV;
305
306 if (!vdev->fops->read)
307 return -EINVAL;
308 if (video_is_registered(vdev))
309 ret = vdev->fops->read(filp, buf, sz, off);
310 if ((vdev->dev_debug & V4L2_DEV_DEBUG_FOP) &&
311 (vdev->dev_debug & V4L2_DEV_DEBUG_STREAMING))
312 printk(KERN_DEBUG "%s: read: %zd (%d)\n",
313 video_device_node_name(vdev), sz, ret);
314 return ret;
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);
321 int ret = -ENODEV;
322
323 if (!vdev->fops->write)
324 return -EINVAL;
325 if (video_is_registered(vdev))
326 ret = vdev->fops->write(filp, buf, sz, off);
327 if ((vdev->dev_debug & V4L2_DEV_DEBUG_FOP) &&
328 (vdev->dev_debug & V4L2_DEV_DEBUG_STREAMING))
329 printk(KERN_DEBUG "%s: write: %zd (%d)\n",
330 video_device_node_name(vdev), sz, ret);
331 return ret;
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);
337 unsigned int res = POLLERR | POLLHUP;
338
339 if (!vdev->fops->poll)
340 return DEFAULT_POLLMASK;
341 if (video_is_registered(vdev))
342 res = vdev->fops->poll(filp, poll);
343 if (vdev->dev_debug & V4L2_DEV_DEBUG_POLL)
344 printk(KERN_DEBUG "%s: poll: %08x\n",
345 video_device_node_name(vdev), res);
346 return res;
347 }
348
349 static long v4l2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
350 {
351 struct video_device *vdev = video_devdata(filp);
352 int ret = -ENODEV;
353
354 if (vdev->fops->unlocked_ioctl) {
355 struct mutex *lock = v4l2_ioctl_get_lock(vdev, cmd);
356
357 if (lock && mutex_lock_interruptible(lock))
358 return -ERESTARTSYS;
359 if (video_is_registered(vdev))
360 ret = vdev->fops->unlocked_ioctl(filp, cmd, arg);
361 if (lock)
362 mutex_unlock(lock);
363 } else
364 ret = -ENOTTY;
365
366 return ret;
367 }
368
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);
377 int ret;
378
379 if (!vdev->fops->get_unmapped_area)
380 return -ENOSYS;
381 if (!video_is_registered(vdev))
382 return -ENODEV;
383 ret = vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags);
384 if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP)
385 printk(KERN_DEBUG "%s: get_unmapped_area (%d)\n",
386 video_device_node_name(vdev), ret);
387 return ret;
388 }
389 #endif
390
391 static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm)
392 {
393 struct video_device *vdev = video_devdata(filp);
394 int ret = -ENODEV;
395
396 if (!vdev->fops->mmap)
397 return -ENODEV;
398 if (video_is_registered(vdev))
399 ret = vdev->fops->mmap(filp, vm);
400 if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP)
401 printk(KERN_DEBUG "%s: mmap (%d)\n",
402 video_device_node_name(vdev), ret);
403 return ret;
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;
410 int ret = 0;
411
412 /* Check if the video device is available */
413 mutex_lock(&videodev_lock);
414 vdev = video_devdata(filp);
415 /* return ENODEV if the video device has already been removed. */
416 if (vdev == NULL || !video_is_registered(vdev)) {
417 mutex_unlock(&videodev_lock);
418 return -ENODEV;
419 }
420 /* and increase the device refcount */
421 video_get(vdev);
422 mutex_unlock(&videodev_lock);
423 if (vdev->fops->open) {
424 if (video_is_registered(vdev))
425 ret = vdev->fops->open(filp);
426 else
427 ret = -ENODEV;
428 }
429
430 if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP)
431 printk(KERN_DEBUG "%s: open (%d)\n",
432 video_device_node_name(vdev), ret);
433 /* decrease the refcount in case of an error */
434 if (ret)
435 video_put(vdev);
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);
443 int ret = 0;
444
445 if (vdev->fops->release)
446 ret = vdev->fops->release(filp);
447 if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP)
448 printk(KERN_DEBUG "%s: release\n",
449 video_device_node_name(vdev));
450
451 /* decrease the refcount unconditionally since the release()
452 return value is ignored. */
453 video_put(vdev);
454 return ret;
455 }
456
457 static const struct file_operations v4l2_fops = {
458 .owner = THIS_MODULE,
459 .read = v4l2_read,
460 .write = v4l2_write,
461 .open = v4l2_open,
462 .get_unmapped_area = v4l2_get_unmapped_area,
463 .mmap = v4l2_mmap,
464 .unlocked_ioctl = v4l2_ioctl,
465 #ifdef CONFIG_COMPAT
466 .compat_ioctl = v4l2_compat_ioctl32,
467 #endif
468 .release = v4l2_release,
469 .poll = v4l2_poll,
470 .llseek = no_llseek,
471 };
472
473 /**
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
476 *
477 * Note that when this is called the new device has not yet been registered
478 * in the video_device array, but it was able to obtain a minor number.
479 *
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.
485 */
486 static int get_index(struct video_device *vdev)
487 {
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);
491 int i;
492
493 bitmap_zero(used, VIDEO_NUM_DEVICES);
494
495 for (i = 0; i < VIDEO_NUM_DEVICES; i++) {
496 if (video_device[i] != NULL &&
497 video_device[i]->v4l2_dev == vdev->v4l2_dev) {
498 set_bit(video_device[i]->index, used);
499 }
500 }
501
502 return find_first_zero_bit(used, VIDEO_NUM_DEVICES);
503 }
504
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;
526 bool is_vid = vdev->vfl_type == VFL_TYPE_GRABBER;
527 bool is_vbi = vdev->vfl_type == VFL_TYPE_VBI;
528 bool is_radio = vdev->vfl_type == VFL_TYPE_RADIO;
529 bool is_sdr = vdev->vfl_type == VFL_TYPE_SDR;
530 bool is_tch = vdev->vfl_type == VFL_TYPE_TOUCH;
531 bool is_rx = vdev->vfl_dir != VFL_DIR_TX;
532 bool is_tx = vdev->vfl_dir != VFL_DIR_RX;
533
534 bitmap_zero(valid_ioctls, BASE_VIDIOC_PRIVATE);
535
536 /* vfl_type and vfl_dir independent ioctls */
537
538 SET_VALID_IOCTL(ops, VIDIOC_QUERYCAP, vidioc_querycap);
539 set_bit(_IOC_NR(VIDIOC_G_PRIORITY), valid_ioctls);
540 set_bit(_IOC_NR(VIDIOC_S_PRIORITY), valid_ioctls);
541
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);
548 if (vdev->ctrl_handler || ops->vidioc_query_ext_ctrl)
549 set_bit(_IOC_NR(VIDIOC_QUERY_EXT_CTRL), valid_ioctls);
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
566 set_bit(_IOC_NR(VIDIOC_DBG_G_CHIP_INFO), valid_ioctls);
567 set_bit(_IOC_NR(VIDIOC_DBG_G_REGISTER), valid_ioctls);
568 set_bit(_IOC_NR(VIDIOC_DBG_S_REGISTER), valid_ioctls);
569 #endif
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);
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
577 if (is_vid || is_tch) {
578 /* video specific ioctls */
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);
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);
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);
626 } else if (is_vbi) {
627 /* vbi specific ioctls */
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);
643 SET_VALID_IOCTL(ops, VIDIOC_G_SLICED_VBI_CAP, vidioc_g_sliced_vbi_cap);
644 } else if (is_sdr && is_rx) {
645 /* SDR receiver specific ioctls */
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);
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);
664 }
665
666 if (is_vid || is_vbi || is_sdr || is_tch) {
667 /* ioctls valid for video, vbi or sdr */
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);
675 SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon);
676 SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff);
677 }
678
679 if (is_vid || is_vbi || is_tch) {
680 /* ioctls valid for video or vbi */
681 if (ops->vidioc_s_std)
682 set_bit(_IOC_NR(VIDIOC_ENUMSTD), valid_ioctls);
683 SET_VALID_IOCTL(ops, VIDIOC_S_STD, vidioc_s_std);
684 SET_VALID_IOCTL(ops, VIDIOC_G_STD, vidioc_g_std);
685 if (is_rx) {
686 SET_VALID_IOCTL(ops, VIDIOC_QUERYSTD, vidioc_querystd);
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);
693 SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings);
694 SET_VALID_IOCTL(ops, VIDIOC_S_EDID, vidioc_s_edid);
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 }
704 if (ops->vidioc_g_parm || (vdev->vfl_type == VFL_TYPE_GRABBER &&
705 ops->vidioc_g_std))
706 set_bit(_IOC_NR(VIDIOC_G_PARM), valid_ioctls);
707 SET_VALID_IOCTL(ops, VIDIOC_S_PARM, vidioc_s_parm);
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);
711 SET_VALID_IOCTL(ops, VIDIOC_DV_TIMINGS_CAP, vidioc_dv_timings_cap);
712 SET_VALID_IOCTL(ops, VIDIOC_G_EDID, vidioc_g_edid);
713 }
714 if (is_tx && (is_radio || is_sdr)) {
715 /* radio transmitter only ioctls */
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
726 bitmap_andnot(vdev->valid_ioctls, valid_ioctls, vdev->valid_ioctls,
727 BASE_VIDIOC_PRIVATE);
728 }
729
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
739 vdev->entity.obj_type = MEDIA_ENTITY_TYPE_VIDEO_DEVICE;
740 vdev->entity.function = MEDIA_ENT_F_UNKNOWN;
741
742 switch (type) {
743 case VFL_TYPE_GRABBER:
744 intf_type = MEDIA_INTF_T_V4L_VIDEO;
745 vdev->entity.function = MEDIA_ENT_F_IO_V4L;
746 break;
747 case VFL_TYPE_VBI:
748 intf_type = MEDIA_INTF_T_V4L_VBI;
749 vdev->entity.function = MEDIA_ENT_F_IO_VBI;
750 break;
751 case VFL_TYPE_SDR:
752 intf_type = MEDIA_INTF_T_V4L_SWRADIO;
753 vdev->entity.function = MEDIA_ENT_F_IO_SWRADIO;
754 break;
755 case VFL_TYPE_TOUCH:
756 intf_type = MEDIA_INTF_T_V4L_TOUCH;
757 vdev->entity.function = MEDIA_ENT_F_IO_V4L;
758 break;
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
775 if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) {
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,
795 vdev->minor);
796 if (!vdev->intf_devnode) {
797 media_device_unregister_entity(&vdev->entity);
798 return -ENOMEM;
799 }
800
801 if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) {
802 struct media_link *link;
803
804 link = media_create_intf_link(&vdev->entity,
805 &vdev->intf_devnode->intf,
806 MEDIA_LNK_FL_ENABLED);
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
820 int __video_register_device(struct video_device *vdev, int type, int nr,
821 int warn_if_nr_in_use, struct module *owner)
822 {
823 int i = 0;
824 int ret;
825 int minor_offset = 0;
826 int minor_cnt = VIDEO_NUM_DEVICES;
827 const char *name_base;
828
829 /* A minor value of -1 marks this video device as never
830 having been registered */
831 vdev->minor = -1;
832
833 /* the release callback MUST be present */
834 if (WARN_ON(!vdev->release))
835 return -EINVAL;
836 /* the v4l2_dev pointer MUST be present */
837 if (WARN_ON(!vdev->v4l2_dev))
838 return -EINVAL;
839
840 /* v4l2_fh support */
841 spin_lock_init(&vdev->fh_lock);
842 INIT_LIST_HEAD(&vdev->fh_list);
843
844 /* Part 1: check device type */
845 switch (type) {
846 case VFL_TYPE_GRABBER:
847 name_base = "video";
848 break;
849 case VFL_TYPE_VBI:
850 name_base = "vbi";
851 break;
852 case VFL_TYPE_RADIO:
853 name_base = "radio";
854 break;
855 case VFL_TYPE_SUBDEV:
856 name_base = "v4l-subdev";
857 break;
858 case VFL_TYPE_SDR:
859 /* Use device name 'swradio' because 'sdr' was already taken. */
860 name_base = "swradio";
861 break;
862 case VFL_TYPE_TOUCH:
863 name_base = "v4l-touch";
864 break;
865 default:
866 printk(KERN_ERR "%s called with unknown type: %d\n",
867 __func__, type);
868 return -EINVAL;
869 }
870
871 vdev->vfl_type = type;
872 vdev->cdev = NULL;
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;
881
882 /* Part 2: find a free minor, device node number and device index. */
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;
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
909 /* Pick a device node number */
910 mutex_lock(&videodev_lock);
911 nr = devnode_find(vdev, nr == -1 ? 0 : nr, minor_cnt);
912 if (nr == minor_cnt)
913 nr = devnode_find(vdev, 0, minor_cnt);
914 if (nr == minor_cnt) {
915 printk(KERN_ERR "could not get a free device node number\n");
916 mutex_unlock(&videodev_lock);
917 return -ENFILE;
918 }
919 #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES
920 /* 1-on-1 mapping of device node number to minor number */
921 i = nr;
922 #else
923 /* The device node number and minor numbers are independent, so
924 we just find the first free minor number. */
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
934 vdev->minor = i + minor_offset;
935 vdev->num = nr;
936 devnode_set(vdev);
937
938 /* Should not happen since we thought this minor was free */
939 WARN_ON(video_device[vdev->minor] != NULL);
940 vdev->index = get_index(vdev);
941 video_device[vdev->minor] = vdev;
942 mutex_unlock(&videodev_lock);
943
944 if (vdev->ioctl_ops)
945 determine_valid_ioctls(vdev);
946
947 /* Part 3: Initialize the character device */
948 vdev->cdev = cdev_alloc();
949 if (vdev->cdev == NULL) {
950 ret = -ENOMEM;
951 goto cleanup;
952 }
953 vdev->cdev->ops = &v4l2_fops;
954 vdev->cdev->owner = owner;
955 ret = cdev_add(vdev->cdev, MKDEV(VIDEO_MAJOR, vdev->minor), 1);
956 if (ret < 0) {
957 printk(KERN_ERR "%s: cdev_add failed\n", __func__);
958 kfree(vdev->cdev);
959 vdev->cdev = NULL;
960 goto cleanup;
961 }
962
963 /* Part 4: register the device with sysfs */
964 vdev->dev.class = &video_class;
965 vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor);
966 vdev->dev.parent = vdev->dev_parent;
967 dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num);
968 ret = device_register(&vdev->dev);
969 if (ret < 0) {
970 printk(KERN_ERR "%s: device_register failed\n", __func__);
971 goto cleanup;
972 }
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;
976
977 if (nr != -1 && nr != vdev->num && warn_if_nr_in_use)
978 printk(KERN_WARNING "%s: requested %s%d, got %s\n", __func__,
979 name_base, nr, video_device_node_name(vdev));
980
981 /* Increase v4l2_device refcount */
982 v4l2_device_get(vdev->v4l2_dev);
983
984 /* Part 5: Register the entity. */
985 ret = video_register_media_controller(vdev, type);
986
987 /* Part 6: Activate this minor. The char device can now be used. */
988 set_bit(V4L2_FL_REGISTERED, &vdev->flags);
989
990 return 0;
991
992 cleanup:
993 mutex_lock(&videodev_lock);
994 if (vdev->cdev)
995 cdev_del(vdev->cdev);
996 video_device[vdev->minor] = NULL;
997 devnode_clear(vdev);
998 mutex_unlock(&videodev_lock);
999 /* Mark this video device as never having been registered. */
1000 vdev->minor = -1;
1001 return ret;
1002 }
1003 EXPORT_SYMBOL(__video_register_device);
1004
1005 /**
1006 * video_unregister_device - unregister a video4linux device
1007 * @vdev: the device to unregister
1008 *
1009 * This unregisters the passed device. Future open calls will
1010 * be met with errors.
1011 */
1012 void video_unregister_device(struct video_device *vdev)
1013 {
1014 /* Check if vdev was ever registered at all */
1015 if (!vdev || !video_is_registered(vdev))
1016 return;
1017
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 */
1022 clear_bit(V4L2_FL_REGISTERED, &vdev->flags);
1023 mutex_unlock(&videodev_lock);
1024 device_unregister(&vdev->dev);
1025 }
1026 EXPORT_SYMBOL(video_unregister_device);
1027
1028 /*
1029 * Initialise video for linux
1030 */
1031 static int __init videodev_init(void)
1032 {
1033 dev_t dev = MKDEV(VIDEO_MAJOR, 0);
1034 int ret;
1035
1036 printk(KERN_INFO "Linux video capture interface: v2.00\n");
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;
1042 }
1043
1044 ret = class_register(&video_class);
1045 if (ret < 0) {
1046 unregister_chrdev_region(dev, VIDEO_NUM_DEVICES);
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 {
1056 dev_t dev = MKDEV(VIDEO_MAJOR, 0);
1057
1058 class_unregister(&video_class);
1059 unregister_chrdev_region(dev, VIDEO_NUM_DEVICES);
1060 }
1061
1062 subsys_initcall(videodev_init);
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");
1068 MODULE_ALIAS_CHARDEV_MAJOR(VIDEO_MAJOR);
Linux kernel - Deliverables
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