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selinux: fix overflow and 0 length allocations
[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_rx = vdev->vfl_dir != VFL_DIR_TX;
531 bool is_tx = vdev->vfl_dir != VFL_DIR_RX;
532
533 bitmap_zero(valid_ioctls, BASE_VIDIOC_PRIVATE);
534
535 /* vfl_type and vfl_dir independent ioctls */
536
537 SET_VALID_IOCTL(ops, VIDIOC_QUERYCAP, vidioc_querycap);
538 set_bit(_IOC_NR(VIDIOC_G_PRIORITY), valid_ioctls);
539 set_bit(_IOC_NR(VIDIOC_S_PRIORITY), valid_ioctls);
540
541 /* Note: the control handler can also be passed through the filehandle,
542 and that can't be tested here. If the bit for these control ioctls
543 is set, then the ioctl is valid. But if it is 0, then it can still
544 be valid if the filehandle passed the control handler. */
545 if (vdev->ctrl_handler || ops->vidioc_queryctrl)
546 set_bit(_IOC_NR(VIDIOC_QUERYCTRL), valid_ioctls);
547 if (vdev->ctrl_handler || ops->vidioc_query_ext_ctrl)
548 set_bit(_IOC_NR(VIDIOC_QUERY_EXT_CTRL), valid_ioctls);
549 if (vdev->ctrl_handler || ops->vidioc_g_ctrl || ops->vidioc_g_ext_ctrls)
550 set_bit(_IOC_NR(VIDIOC_G_CTRL), valid_ioctls);
551 if (vdev->ctrl_handler || ops->vidioc_s_ctrl || ops->vidioc_s_ext_ctrls)
552 set_bit(_IOC_NR(VIDIOC_S_CTRL), valid_ioctls);
553 if (vdev->ctrl_handler || ops->vidioc_g_ext_ctrls)
554 set_bit(_IOC_NR(VIDIOC_G_EXT_CTRLS), valid_ioctls);
555 if (vdev->ctrl_handler || ops->vidioc_s_ext_ctrls)
556 set_bit(_IOC_NR(VIDIOC_S_EXT_CTRLS), valid_ioctls);
557 if (vdev->ctrl_handler || ops->vidioc_try_ext_ctrls)
558 set_bit(_IOC_NR(VIDIOC_TRY_EXT_CTRLS), valid_ioctls);
559 if (vdev->ctrl_handler || ops->vidioc_querymenu)
560 set_bit(_IOC_NR(VIDIOC_QUERYMENU), valid_ioctls);
561 SET_VALID_IOCTL(ops, VIDIOC_G_FREQUENCY, vidioc_g_frequency);
562 SET_VALID_IOCTL(ops, VIDIOC_S_FREQUENCY, vidioc_s_frequency);
563 SET_VALID_IOCTL(ops, VIDIOC_LOG_STATUS, vidioc_log_status);
564 #ifdef CONFIG_VIDEO_ADV_DEBUG
565 set_bit(_IOC_NR(VIDIOC_DBG_G_CHIP_INFO), valid_ioctls);
566 set_bit(_IOC_NR(VIDIOC_DBG_G_REGISTER), valid_ioctls);
567 set_bit(_IOC_NR(VIDIOC_DBG_S_REGISTER), valid_ioctls);
568 #endif
569 /* yes, really vidioc_subscribe_event */
570 SET_VALID_IOCTL(ops, VIDIOC_DQEVENT, vidioc_subscribe_event);
571 SET_VALID_IOCTL(ops, VIDIOC_SUBSCRIBE_EVENT, vidioc_subscribe_event);
572 SET_VALID_IOCTL(ops, VIDIOC_UNSUBSCRIBE_EVENT, vidioc_unsubscribe_event);
573 if (ops->vidioc_enum_freq_bands || ops->vidioc_g_tuner || ops->vidioc_g_modulator)
574 set_bit(_IOC_NR(VIDIOC_ENUM_FREQ_BANDS), valid_ioctls);
575
576 if (is_vid) {
577 /* video specific ioctls */
578 if ((is_rx && (ops->vidioc_enum_fmt_vid_cap ||
579 ops->vidioc_enum_fmt_vid_cap_mplane ||
580 ops->vidioc_enum_fmt_vid_overlay)) ||
581 (is_tx && (ops->vidioc_enum_fmt_vid_out ||
582 ops->vidioc_enum_fmt_vid_out_mplane)))
583 set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls);
584 if ((is_rx && (ops->vidioc_g_fmt_vid_cap ||
585 ops->vidioc_g_fmt_vid_cap_mplane ||
586 ops->vidioc_g_fmt_vid_overlay)) ||
587 (is_tx && (ops->vidioc_g_fmt_vid_out ||
588 ops->vidioc_g_fmt_vid_out_mplane ||
589 ops->vidioc_g_fmt_vid_out_overlay)))
590 set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls);
591 if ((is_rx && (ops->vidioc_s_fmt_vid_cap ||
592 ops->vidioc_s_fmt_vid_cap_mplane ||
593 ops->vidioc_s_fmt_vid_overlay)) ||
594 (is_tx && (ops->vidioc_s_fmt_vid_out ||
595 ops->vidioc_s_fmt_vid_out_mplane ||
596 ops->vidioc_s_fmt_vid_out_overlay)))
597 set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls);
598 if ((is_rx && (ops->vidioc_try_fmt_vid_cap ||
599 ops->vidioc_try_fmt_vid_cap_mplane ||
600 ops->vidioc_try_fmt_vid_overlay)) ||
601 (is_tx && (ops->vidioc_try_fmt_vid_out ||
602 ops->vidioc_try_fmt_vid_out_mplane ||
603 ops->vidioc_try_fmt_vid_out_overlay)))
604 set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls);
605 SET_VALID_IOCTL(ops, VIDIOC_OVERLAY, vidioc_overlay);
606 SET_VALID_IOCTL(ops, VIDIOC_G_FBUF, vidioc_g_fbuf);
607 SET_VALID_IOCTL(ops, VIDIOC_S_FBUF, vidioc_s_fbuf);
608 SET_VALID_IOCTL(ops, VIDIOC_G_JPEGCOMP, vidioc_g_jpegcomp);
609 SET_VALID_IOCTL(ops, VIDIOC_S_JPEGCOMP, vidioc_s_jpegcomp);
610 SET_VALID_IOCTL(ops, VIDIOC_G_ENC_INDEX, vidioc_g_enc_index);
611 SET_VALID_IOCTL(ops, VIDIOC_ENCODER_CMD, vidioc_encoder_cmd);
612 SET_VALID_IOCTL(ops, VIDIOC_TRY_ENCODER_CMD, vidioc_try_encoder_cmd);
613 SET_VALID_IOCTL(ops, VIDIOC_DECODER_CMD, vidioc_decoder_cmd);
614 SET_VALID_IOCTL(ops, VIDIOC_TRY_DECODER_CMD, vidioc_try_decoder_cmd);
615 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes);
616 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals);
617 if (ops->vidioc_g_crop || ops->vidioc_g_selection)
618 set_bit(_IOC_NR(VIDIOC_G_CROP), valid_ioctls);
619 if (ops->vidioc_s_crop || ops->vidioc_s_selection)
620 set_bit(_IOC_NR(VIDIOC_S_CROP), valid_ioctls);
621 SET_VALID_IOCTL(ops, VIDIOC_G_SELECTION, vidioc_g_selection);
622 SET_VALID_IOCTL(ops, VIDIOC_S_SELECTION, vidioc_s_selection);
623 if (ops->vidioc_cropcap || ops->vidioc_g_selection)
624 set_bit(_IOC_NR(VIDIOC_CROPCAP), valid_ioctls);
625 } else if (is_vbi) {
626 /* vbi specific ioctls */
627 if ((is_rx && (ops->vidioc_g_fmt_vbi_cap ||
628 ops->vidioc_g_fmt_sliced_vbi_cap)) ||
629 (is_tx && (ops->vidioc_g_fmt_vbi_out ||
630 ops->vidioc_g_fmt_sliced_vbi_out)))
631 set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls);
632 if ((is_rx && (ops->vidioc_s_fmt_vbi_cap ||
633 ops->vidioc_s_fmt_sliced_vbi_cap)) ||
634 (is_tx && (ops->vidioc_s_fmt_vbi_out ||
635 ops->vidioc_s_fmt_sliced_vbi_out)))
636 set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls);
637 if ((is_rx && (ops->vidioc_try_fmt_vbi_cap ||
638 ops->vidioc_try_fmt_sliced_vbi_cap)) ||
639 (is_tx && (ops->vidioc_try_fmt_vbi_out ||
640 ops->vidioc_try_fmt_sliced_vbi_out)))
641 set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls);
642 SET_VALID_IOCTL(ops, VIDIOC_G_SLICED_VBI_CAP, vidioc_g_sliced_vbi_cap);
643 } else if (is_sdr && is_rx) {
644 /* SDR receiver specific ioctls */
645 if (ops->vidioc_enum_fmt_sdr_cap)
646 set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls);
647 if (ops->vidioc_g_fmt_sdr_cap)
648 set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls);
649 if (ops->vidioc_s_fmt_sdr_cap)
650 set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls);
651 if (ops->vidioc_try_fmt_sdr_cap)
652 set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls);
653 } else if (is_sdr && is_tx) {
654 /* SDR transmitter specific ioctls */
655 if (ops->vidioc_enum_fmt_sdr_out)
656 set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls);
657 if (ops->vidioc_g_fmt_sdr_out)
658 set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls);
659 if (ops->vidioc_s_fmt_sdr_out)
660 set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls);
661 if (ops->vidioc_try_fmt_sdr_out)
662 set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls);
663 }
664
665 if (is_vid || is_vbi || is_sdr) {
666 /* ioctls valid for video, vbi or sdr */
667 SET_VALID_IOCTL(ops, VIDIOC_REQBUFS, vidioc_reqbufs);
668 SET_VALID_IOCTL(ops, VIDIOC_QUERYBUF, vidioc_querybuf);
669 SET_VALID_IOCTL(ops, VIDIOC_QBUF, vidioc_qbuf);
670 SET_VALID_IOCTL(ops, VIDIOC_EXPBUF, vidioc_expbuf);
671 SET_VALID_IOCTL(ops, VIDIOC_DQBUF, vidioc_dqbuf);
672 SET_VALID_IOCTL(ops, VIDIOC_CREATE_BUFS, vidioc_create_bufs);
673 SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, vidioc_prepare_buf);
674 SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon);
675 SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff);
676 }
677
678 if (is_vid || is_vbi) {
679 /* ioctls valid for video or vbi */
680 if (ops->vidioc_s_std)
681 set_bit(_IOC_NR(VIDIOC_ENUMSTD), valid_ioctls);
682 SET_VALID_IOCTL(ops, VIDIOC_S_STD, vidioc_s_std);
683 SET_VALID_IOCTL(ops, VIDIOC_G_STD, vidioc_g_std);
684 if (is_rx) {
685 SET_VALID_IOCTL(ops, VIDIOC_QUERYSTD, vidioc_querystd);
686 SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input);
687 SET_VALID_IOCTL(ops, VIDIOC_G_INPUT, vidioc_g_input);
688 SET_VALID_IOCTL(ops, VIDIOC_S_INPUT, vidioc_s_input);
689 SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDIO, vidioc_enumaudio);
690 SET_VALID_IOCTL(ops, VIDIOC_G_AUDIO, vidioc_g_audio);
691 SET_VALID_IOCTL(ops, VIDIOC_S_AUDIO, vidioc_s_audio);
692 SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings);
693 SET_VALID_IOCTL(ops, VIDIOC_S_EDID, vidioc_s_edid);
694 }
695 if (is_tx) {
696 SET_VALID_IOCTL(ops, VIDIOC_ENUMOUTPUT, vidioc_enum_output);
697 SET_VALID_IOCTL(ops, VIDIOC_G_OUTPUT, vidioc_g_output);
698 SET_VALID_IOCTL(ops, VIDIOC_S_OUTPUT, vidioc_s_output);
699 SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDOUT, vidioc_enumaudout);
700 SET_VALID_IOCTL(ops, VIDIOC_G_AUDOUT, vidioc_g_audout);
701 SET_VALID_IOCTL(ops, VIDIOC_S_AUDOUT, vidioc_s_audout);
702 }
703 if (ops->vidioc_g_parm || (vdev->vfl_type == VFL_TYPE_GRABBER &&
704 ops->vidioc_g_std))
705 set_bit(_IOC_NR(VIDIOC_G_PARM), valid_ioctls);
706 SET_VALID_IOCTL(ops, VIDIOC_S_PARM, vidioc_s_parm);
707 SET_VALID_IOCTL(ops, VIDIOC_S_DV_TIMINGS, vidioc_s_dv_timings);
708 SET_VALID_IOCTL(ops, VIDIOC_G_DV_TIMINGS, vidioc_g_dv_timings);
709 SET_VALID_IOCTL(ops, VIDIOC_ENUM_DV_TIMINGS, vidioc_enum_dv_timings);
710 SET_VALID_IOCTL(ops, VIDIOC_DV_TIMINGS_CAP, vidioc_dv_timings_cap);
711 SET_VALID_IOCTL(ops, VIDIOC_G_EDID, vidioc_g_edid);
712 }
713 if (is_tx && (is_radio || is_sdr)) {
714 /* radio transmitter only ioctls */
715 SET_VALID_IOCTL(ops, VIDIOC_G_MODULATOR, vidioc_g_modulator);
716 SET_VALID_IOCTL(ops, VIDIOC_S_MODULATOR, vidioc_s_modulator);
717 }
718 if (is_rx) {
719 /* receiver only ioctls */
720 SET_VALID_IOCTL(ops, VIDIOC_G_TUNER, vidioc_g_tuner);
721 SET_VALID_IOCTL(ops, VIDIOC_S_TUNER, vidioc_s_tuner);
722 SET_VALID_IOCTL(ops, VIDIOC_S_HW_FREQ_SEEK, vidioc_s_hw_freq_seek);
723 }
724
725 bitmap_andnot(vdev->valid_ioctls, valid_ioctls, vdev->valid_ioctls,
726 BASE_VIDIOC_PRIVATE);
727 }
728
729 static int video_register_media_controller(struct video_device *vdev, int type)
730 {
731 #if defined(CONFIG_MEDIA_CONTROLLER)
732 u32 intf_type;
733 int ret;
734
735 if (!vdev->v4l2_dev->mdev)
736 return 0;
737
738 vdev->entity.obj_type = MEDIA_ENTITY_TYPE_VIDEO_DEVICE;
739 vdev->entity.function = MEDIA_ENT_F_UNKNOWN;
740
741 switch (type) {
742 case VFL_TYPE_GRABBER:
743 intf_type = MEDIA_INTF_T_V4L_VIDEO;
744 vdev->entity.function = MEDIA_ENT_F_IO_V4L;
745 break;
746 case VFL_TYPE_VBI:
747 intf_type = MEDIA_INTF_T_V4L_VBI;
748 vdev->entity.function = MEDIA_ENT_F_IO_VBI;
749 break;
750 case VFL_TYPE_SDR:
751 intf_type = MEDIA_INTF_T_V4L_SWRADIO;
752 vdev->entity.function = MEDIA_ENT_F_IO_SWRADIO;
753 break;
754 case VFL_TYPE_RADIO:
755 intf_type = MEDIA_INTF_T_V4L_RADIO;
756 /*
757 * Radio doesn't have an entity at the V4L2 side to represent
758 * radio input or output. Instead, the audio input/output goes
759 * via either physical wires or ALSA.
760 */
761 break;
762 case VFL_TYPE_SUBDEV:
763 intf_type = MEDIA_INTF_T_V4L_SUBDEV;
764 /* Entity will be created via v4l2_device_register_subdev() */
765 break;
766 default:
767 return 0;
768 }
769
770 if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) {
771 vdev->entity.name = vdev->name;
772
773 /* Needed just for backward compatibility with legacy MC API */
774 vdev->entity.info.dev.major = VIDEO_MAJOR;
775 vdev->entity.info.dev.minor = vdev->minor;
776
777 ret = media_device_register_entity(vdev->v4l2_dev->mdev,
778 &vdev->entity);
779 if (ret < 0) {
780 printk(KERN_WARNING
781 "%s: media_device_register_entity failed\n",
782 __func__);
783 return ret;
784 }
785 }
786
787 vdev->intf_devnode = media_devnode_create(vdev->v4l2_dev->mdev,
788 intf_type,
789 0, VIDEO_MAJOR,
790 vdev->minor);
791 if (!vdev->intf_devnode) {
792 media_device_unregister_entity(&vdev->entity);
793 return -ENOMEM;
794 }
795
796 if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) {
797 struct media_link *link;
798
799 link = media_create_intf_link(&vdev->entity,
800 &vdev->intf_devnode->intf,
801 MEDIA_LNK_FL_ENABLED);
802 if (!link) {
803 media_devnode_remove(vdev->intf_devnode);
804 media_device_unregister_entity(&vdev->entity);
805 return -ENOMEM;
806 }
807 }
808
809 /* FIXME: how to create the other interface links? */
810
811 #endif
812 return 0;
813 }
814
815 int __video_register_device(struct video_device *vdev, int type, int nr,
816 int warn_if_nr_in_use, struct module *owner)
817 {
818 int i = 0;
819 int ret;
820 int minor_offset = 0;
821 int minor_cnt = VIDEO_NUM_DEVICES;
822 const char *name_base;
823
824 /* A minor value of -1 marks this video device as never
825 having been registered */
826 vdev->minor = -1;
827
828 /* the release callback MUST be present */
829 if (WARN_ON(!vdev->release))
830 return -EINVAL;
831 /* the v4l2_dev pointer MUST be present */
832 if (WARN_ON(!vdev->v4l2_dev))
833 return -EINVAL;
834
835 /* v4l2_fh support */
836 spin_lock_init(&vdev->fh_lock);
837 INIT_LIST_HEAD(&vdev->fh_list);
838
839 /* Part 1: check device type */
840 switch (type) {
841 case VFL_TYPE_GRABBER:
842 name_base = "video";
843 break;
844 case VFL_TYPE_VBI:
845 name_base = "vbi";
846 break;
847 case VFL_TYPE_RADIO:
848 name_base = "radio";
849 break;
850 case VFL_TYPE_SUBDEV:
851 name_base = "v4l-subdev";
852 break;
853 case VFL_TYPE_SDR:
854 /* Use device name 'swradio' because 'sdr' was already taken. */
855 name_base = "swradio";
856 break;
857 default:
858 printk(KERN_ERR "%s called with unknown type: %d\n",
859 __func__, type);
860 return -EINVAL;
861 }
862
863 vdev->vfl_type = type;
864 vdev->cdev = NULL;
865 if (vdev->dev_parent == NULL)
866 vdev->dev_parent = vdev->v4l2_dev->dev;
867 if (vdev->ctrl_handler == NULL)
868 vdev->ctrl_handler = vdev->v4l2_dev->ctrl_handler;
869 /* If the prio state pointer is NULL, then use the v4l2_device
870 prio state. */
871 if (vdev->prio == NULL)
872 vdev->prio = &vdev->v4l2_dev->prio;
873
874 /* Part 2: find a free minor, device node number and device index. */
875 #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES
876 /* Keep the ranges for the first four types for historical
877 * reasons.
878 * Newer devices (not yet in place) should use the range
879 * of 128-191 and just pick the first free minor there
880 * (new style). */
881 switch (type) {
882 case VFL_TYPE_GRABBER:
883 minor_offset = 0;
884 minor_cnt = 64;
885 break;
886 case VFL_TYPE_RADIO:
887 minor_offset = 64;
888 minor_cnt = 64;
889 break;
890 case VFL_TYPE_VBI:
891 minor_offset = 224;
892 minor_cnt = 32;
893 break;
894 default:
895 minor_offset = 128;
896 minor_cnt = 64;
897 break;
898 }
899 #endif
900
901 /* Pick a device node number */
902 mutex_lock(&videodev_lock);
903 nr = devnode_find(vdev, nr == -1 ? 0 : nr, minor_cnt);
904 if (nr == minor_cnt)
905 nr = devnode_find(vdev, 0, minor_cnt);
906 if (nr == minor_cnt) {
907 printk(KERN_ERR "could not get a free device node number\n");
908 mutex_unlock(&videodev_lock);
909 return -ENFILE;
910 }
911 #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES
912 /* 1-on-1 mapping of device node number to minor number */
913 i = nr;
914 #else
915 /* The device node number and minor numbers are independent, so
916 we just find the first free minor number. */
917 for (i = 0; i < VIDEO_NUM_DEVICES; i++)
918 if (video_device[i] == NULL)
919 break;
920 if (i == VIDEO_NUM_DEVICES) {
921 mutex_unlock(&videodev_lock);
922 printk(KERN_ERR "could not get a free minor\n");
923 return -ENFILE;
924 }
925 #endif
926 vdev->minor = i + minor_offset;
927 vdev->num = nr;
928 devnode_set(vdev);
929
930 /* Should not happen since we thought this minor was free */
931 WARN_ON(video_device[vdev->minor] != NULL);
932 vdev->index = get_index(vdev);
933 video_device[vdev->minor] = vdev;
934 mutex_unlock(&videodev_lock);
935
936 if (vdev->ioctl_ops)
937 determine_valid_ioctls(vdev);
938
939 /* Part 3: Initialize the character device */
940 vdev->cdev = cdev_alloc();
941 if (vdev->cdev == NULL) {
942 ret = -ENOMEM;
943 goto cleanup;
944 }
945 vdev->cdev->ops = &v4l2_fops;
946 vdev->cdev->owner = owner;
947 ret = cdev_add(vdev->cdev, MKDEV(VIDEO_MAJOR, vdev->minor), 1);
948 if (ret < 0) {
949 printk(KERN_ERR "%s: cdev_add failed\n", __func__);
950 kfree(vdev->cdev);
951 vdev->cdev = NULL;
952 goto cleanup;
953 }
954
955 /* Part 4: register the device with sysfs */
956 vdev->dev.class = &video_class;
957 vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor);
958 vdev->dev.parent = vdev->dev_parent;
959 dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num);
960 ret = device_register(&vdev->dev);
961 if (ret < 0) {
962 printk(KERN_ERR "%s: device_register failed\n", __func__);
963 goto cleanup;
964 }
965 /* Register the release callback that will be called when the last
966 reference to the device goes away. */
967 vdev->dev.release = v4l2_device_release;
968
969 if (nr != -1 && nr != vdev->num && warn_if_nr_in_use)
970 printk(KERN_WARNING "%s: requested %s%d, got %s\n", __func__,
971 name_base, nr, video_device_node_name(vdev));
972
973 /* Increase v4l2_device refcount */
974 v4l2_device_get(vdev->v4l2_dev);
975
976 /* Part 5: Register the entity. */
977 ret = video_register_media_controller(vdev, type);
978
979 /* Part 6: Activate this minor. The char device can now be used. */
980 set_bit(V4L2_FL_REGISTERED, &vdev->flags);
981
982 return 0;
983
984 cleanup:
985 mutex_lock(&videodev_lock);
986 if (vdev->cdev)
987 cdev_del(vdev->cdev);
988 video_device[vdev->minor] = NULL;
989 devnode_clear(vdev);
990 mutex_unlock(&videodev_lock);
991 /* Mark this video device as never having been registered. */
992 vdev->minor = -1;
993 return ret;
994 }
995 EXPORT_SYMBOL(__video_register_device);
996
997 /**
998 * video_unregister_device - unregister a video4linux device
999 * @vdev: the device to unregister
1000 *
1001 * This unregisters the passed device. Future open calls will
1002 * be met with errors.
1003 */
1004 void video_unregister_device(struct video_device *vdev)
1005 {
1006 /* Check if vdev was ever registered at all */
1007 if (!vdev || !video_is_registered(vdev))
1008 return;
1009
1010 mutex_lock(&videodev_lock);
1011 /* This must be in a critical section to prevent a race with v4l2_open.
1012 * Once this bit has been cleared video_get may never be called again.
1013 */
1014 clear_bit(V4L2_FL_REGISTERED, &vdev->flags);
1015 mutex_unlock(&videodev_lock);
1016 device_unregister(&vdev->dev);
1017 }
1018 EXPORT_SYMBOL(video_unregister_device);
1019
1020 /*
1021 * Initialise video for linux
1022 */
1023 static int __init videodev_init(void)
1024 {
1025 dev_t dev = MKDEV(VIDEO_MAJOR, 0);
1026 int ret;
1027
1028 printk(KERN_INFO "Linux video capture interface: v2.00\n");
1029 ret = register_chrdev_region(dev, VIDEO_NUM_DEVICES, VIDEO_NAME);
1030 if (ret < 0) {
1031 printk(KERN_WARNING "videodev: unable to get major %d\n",
1032 VIDEO_MAJOR);
1033 return ret;
1034 }
1035
1036 ret = class_register(&video_class);
1037 if (ret < 0) {
1038 unregister_chrdev_region(dev, VIDEO_NUM_DEVICES);
1039 printk(KERN_WARNING "video_dev: class_register failed\n");
1040 return -EIO;
1041 }
1042
1043 return 0;
1044 }
1045
1046 static void __exit videodev_exit(void)
1047 {
1048 dev_t dev = MKDEV(VIDEO_MAJOR, 0);
1049
1050 class_unregister(&video_class);
1051 unregister_chrdev_region(dev, VIDEO_NUM_DEVICES);
1052 }
1053
1054 subsys_initcall(videodev_init);
1055 module_exit(videodev_exit)
1056
1057 MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@infradead.org>");
1058 MODULE_DESCRIPTION("Device registrar for Video4Linux drivers v2");
1059 MODULE_LICENSE("GPL");
1060 MODULE_ALIAS_CHARDEV_MAJOR(VIDEO_MAJOR);
Linux kernel - Deliverables
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