1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Video capture interface for Linux version 2
4 *
5 * A generic video device interface for the LINUX operating system
6 * using a set of device structures/vectors for low level operations.
7 *
8 * Authors: Alan Cox, <alan@lxorguk.ukuu.org.uk> (version 1)
9 * Mauro Carvalho Chehab <mchehab@kernel.org> (version 2)
10 *
11 * Fixes: 20000516 Claudio Matsuoka <claudio@conectiva.com>
12 * - Added procfs support
13 */
14
15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16
17 #include <linux/debugfs.h>
18 #include <linux/module.h>
19 #include <linux/types.h>
20 #include <linux/kernel.h>
21 #include <linux/mm.h>
22 #include <linux/string.h>
23 #include <linux/errno.h>
24 #include <linux/init.h>
25 #include <linux/kmod.h>
26 #include <linux/slab.h>
27 #include <linux/uaccess.h>
28
29 #include <media/v4l2-common.h>
30 #include <media/v4l2-device.h>
31 #include <media/v4l2-ioctl.h>
32 #include <media/v4l2-event.h>
33
34 #define VIDEO_NUM_DEVICES 256
35 #define VIDEO_NAME "video4linux"
36
37 #define dprintk(fmt, arg...) do { \
38 printk(KERN_DEBUG pr_fmt("%s: " fmt), \
39 __func__, ##arg); \
40 } while (0)
41
42 /*
43 * sysfs stuff
44 */
45
index_show(struct device * cd,struct device_attribute * attr,char * buf)46 static ssize_t index_show(struct device *cd,
47 struct device_attribute *attr, char *buf)
48 {
49 struct video_device *vdev = to_video_device(cd);
50
51 return sprintf(buf, "%i\n", vdev->index);
52 }
53 static DEVICE_ATTR_RO(index);
54
dev_debug_show(struct device * cd,struct device_attribute * attr,char * buf)55 static ssize_t dev_debug_show(struct device *cd,
56 struct device_attribute *attr, char *buf)
57 {
58 struct video_device *vdev = to_video_device(cd);
59
60 return sprintf(buf, "%i\n", vdev->dev_debug);
61 }
62
dev_debug_store(struct device * cd,struct device_attribute * attr,const char * buf,size_t len)63 static ssize_t dev_debug_store(struct device *cd, struct device_attribute *attr,
64 const char *buf, size_t len)
65 {
66 struct video_device *vdev = to_video_device(cd);
67 int res = 0;
68 u16 value;
69
70 res = kstrtou16(buf, 0, &value);
71 if (res)
72 return res;
73
74 vdev->dev_debug = value;
75 return len;
76 }
77 static DEVICE_ATTR_RW(dev_debug);
78
name_show(struct device * cd,struct device_attribute * attr,char * buf)79 static ssize_t name_show(struct device *cd,
80 struct device_attribute *attr, char *buf)
81 {
82 struct video_device *vdev = to_video_device(cd);
83
84 return sprintf(buf, "%.*s\n", (int)sizeof(vdev->name), vdev->name);
85 }
86 static DEVICE_ATTR_RO(name);
87
88 static struct attribute *video_device_attrs[] = {
89 &dev_attr_name.attr,
90 &dev_attr_dev_debug.attr,
91 &dev_attr_index.attr,
92 NULL,
93 };
94 ATTRIBUTE_GROUPS(video_device);
95
96 /*
97 * Active devices
98 */
99 static struct video_device *video_devices[VIDEO_NUM_DEVICES];
100 static DEFINE_MUTEX(videodev_lock);
101 static DECLARE_BITMAP(devnode_nums[VFL_TYPE_MAX], VIDEO_NUM_DEVICES);
102
103 /* Device node utility functions */
104
105 /* Note: these utility functions all assume that vfl_type is in the range
106 [0, VFL_TYPE_MAX-1]. */
107
108 #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES
109 /* Return the bitmap corresponding to vfl_type. */
devnode_bits(enum vfl_devnode_type vfl_type)110 static inline unsigned long *devnode_bits(enum vfl_devnode_type vfl_type)
111 {
112 /* Any types not assigned to fixed minor ranges must be mapped to
113 one single bitmap for the purposes of finding a free node number
114 since all those unassigned types use the same minor range. */
115 int idx = (vfl_type > VFL_TYPE_RADIO) ? VFL_TYPE_MAX - 1 : vfl_type;
116
117 return devnode_nums[idx];
118 }
119 #else
120 /* Return the bitmap corresponding to vfl_type. */
devnode_bits(enum vfl_devnode_type vfl_type)121 static inline unsigned long *devnode_bits(enum vfl_devnode_type vfl_type)
122 {
123 return devnode_nums[vfl_type];
124 }
125 #endif
126
127 /* Mark device node number vdev->num as used */
devnode_set(struct video_device * vdev)128 static inline void devnode_set(struct video_device *vdev)
129 {
130 set_bit(vdev->num, devnode_bits(vdev->vfl_type));
131 }
132
133 /* Mark device node number vdev->num as unused */
devnode_clear(struct video_device * vdev)134 static inline void devnode_clear(struct video_device *vdev)
135 {
136 clear_bit(vdev->num, devnode_bits(vdev->vfl_type));
137 }
138
139 /* Try to find a free device node number in the range [from, to> */
devnode_find(struct video_device * vdev,int from,int to)140 static inline int devnode_find(struct video_device *vdev, int from, int to)
141 {
142 return find_next_zero_bit(devnode_bits(vdev->vfl_type), to, from);
143 }
144
video_device_alloc(void)145 struct video_device *video_device_alloc(void)
146 {
147 return kzalloc(sizeof(struct video_device), GFP_KERNEL);
148 }
149 EXPORT_SYMBOL(video_device_alloc);
150
video_device_release(struct video_device * vdev)151 void video_device_release(struct video_device *vdev)
152 {
153 kfree(vdev);
154 }
155 EXPORT_SYMBOL(video_device_release);
156
video_device_release_empty(struct video_device * vdev)157 void video_device_release_empty(struct video_device *vdev)
158 {
159 /* Do nothing */
160 /* Only valid when the video_device struct is a static. */
161 }
162 EXPORT_SYMBOL(video_device_release_empty);
163
video_get(struct video_device * vdev)164 static inline void video_get(struct video_device *vdev)
165 {
166 get_device(&vdev->dev);
167 }
168
video_put(struct video_device * vdev)169 static inline void video_put(struct video_device *vdev)
170 {
171 put_device(&vdev->dev);
172 }
173
174 /* Called when the last user of the video device exits. */
v4l2_device_release(struct device * cd)175 static void v4l2_device_release(struct device *cd)
176 {
177 struct video_device *vdev = to_video_device(cd);
178 struct v4l2_device *v4l2_dev = vdev->v4l2_dev;
179
180 mutex_lock(&videodev_lock);
181 if (WARN_ON(video_devices[vdev->minor] != vdev)) {
182 /* should not happen */
183 mutex_unlock(&videodev_lock);
184 return;
185 }
186
187 /* Free up this device for reuse */
188 video_devices[vdev->minor] = NULL;
189
190 /* Delete the cdev on this minor as well */
191 cdev_del(vdev->cdev);
192 /* Just in case some driver tries to access this from
193 the release() callback. */
194 vdev->cdev = NULL;
195
196 /* Mark device node number as free */
197 devnode_clear(vdev);
198
199 mutex_unlock(&videodev_lock);
200
201 #if defined(CONFIG_MEDIA_CONTROLLER)
202 if (v4l2_dev->mdev && vdev->vfl_dir != VFL_DIR_M2M) {
203 /* Remove interfaces and interface links */
204 media_devnode_remove(vdev->intf_devnode);
205 if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN)
206 media_device_unregister_entity(&vdev->entity);
207 }
208 #endif
209
210 /* Do not call v4l2_device_put if there is no release callback set.
211 * Drivers that have no v4l2_device release callback might free the
212 * v4l2_dev instance in the video_device release callback below, so we
213 * must perform this check here.
214 *
215 * TODO: In the long run all drivers that use v4l2_device should use the
216 * v4l2_device release callback. This check will then be unnecessary.
217 */
218 if (v4l2_dev->release == NULL)
219 v4l2_dev = NULL;
220
221 /* Release video_device and perform other
222 cleanups as needed. */
223 vdev->release(vdev);
224
225 /* Decrease v4l2_device refcount */
226 if (v4l2_dev)
227 v4l2_device_put(v4l2_dev);
228 }
229
230 static struct class video_class = {
231 .name = VIDEO_NAME,
232 .dev_groups = video_device_groups,
233 };
234
video_devdata(struct file * file)235 struct video_device *video_devdata(struct file *file)
236 {
237 return video_devices[iminor(file_inode(file))];
238 }
239 EXPORT_SYMBOL(video_devdata);
240
241
242 /* Priority handling */
243
prio_is_valid(enum v4l2_priority prio)244 static inline bool prio_is_valid(enum v4l2_priority prio)
245 {
246 return prio == V4L2_PRIORITY_BACKGROUND ||
247 prio == V4L2_PRIORITY_INTERACTIVE ||
248 prio == V4L2_PRIORITY_RECORD;
249 }
250
v4l2_prio_init(struct v4l2_prio_state * global)251 void v4l2_prio_init(struct v4l2_prio_state *global)
252 {
253 memset(global, 0, sizeof(*global));
254 }
255 EXPORT_SYMBOL(v4l2_prio_init);
256
v4l2_prio_change(struct v4l2_prio_state * global,enum v4l2_priority * local,enum v4l2_priority new)257 int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local,
258 enum v4l2_priority new)
259 {
260 if (!prio_is_valid(new))
261 return -EINVAL;
262 if (*local == new)
263 return 0;
264
265 atomic_inc(&global->prios[new]);
266 if (prio_is_valid(*local))
267 atomic_dec(&global->prios[*local]);
268 *local = new;
269 return 0;
270 }
271 EXPORT_SYMBOL(v4l2_prio_change);
272
v4l2_prio_open(struct v4l2_prio_state * global,enum v4l2_priority * local)273 void v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local)
274 {
275 v4l2_prio_change(global, local, V4L2_PRIORITY_DEFAULT);
276 }
277 EXPORT_SYMBOL(v4l2_prio_open);
278
v4l2_prio_close(struct v4l2_prio_state * global,enum v4l2_priority local)279 void v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority local)
280 {
281 if (prio_is_valid(local))
282 atomic_dec(&global->prios[local]);
283 }
284 EXPORT_SYMBOL(v4l2_prio_close);
285
v4l2_prio_max(struct v4l2_prio_state * global)286 enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global)
287 {
288 if (atomic_read(&global->prios[V4L2_PRIORITY_RECORD]) > 0)
289 return V4L2_PRIORITY_RECORD;
290 if (atomic_read(&global->prios[V4L2_PRIORITY_INTERACTIVE]) > 0)
291 return V4L2_PRIORITY_INTERACTIVE;
292 if (atomic_read(&global->prios[V4L2_PRIORITY_BACKGROUND]) > 0)
293 return V4L2_PRIORITY_BACKGROUND;
294 return V4L2_PRIORITY_UNSET;
295 }
296 EXPORT_SYMBOL(v4l2_prio_max);
297
v4l2_prio_check(struct v4l2_prio_state * global,enum v4l2_priority local)298 int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority local)
299 {
300 return (local < v4l2_prio_max(global)) ? -EBUSY : 0;
301 }
302 EXPORT_SYMBOL(v4l2_prio_check);
303
304
v4l2_read(struct file * filp,char __user * buf,size_t sz,loff_t * off)305 static ssize_t v4l2_read(struct file *filp, char __user *buf,
306 size_t sz, loff_t *off)
307 {
308 struct video_device *vdev = video_devdata(filp);
309 int ret = -ENODEV;
310
311 if (!vdev->fops->read)
312 return -EINVAL;
313 if (video_is_registered(vdev))
314 ret = vdev->fops->read(filp, buf, sz, off);
315 if ((vdev->dev_debug & V4L2_DEV_DEBUG_FOP) &&
316 (vdev->dev_debug & V4L2_DEV_DEBUG_STREAMING))
317 dprintk("%s: read: %zd (%d)\n",
318 video_device_node_name(vdev), sz, ret);
319 return ret;
320 }
321
v4l2_write(struct file * filp,const char __user * buf,size_t sz,loff_t * off)322 static ssize_t v4l2_write(struct file *filp, const char __user *buf,
323 size_t sz, loff_t *off)
324 {
325 struct video_device *vdev = video_devdata(filp);
326 int ret = -ENODEV;
327
328 if (!vdev->fops->write)
329 return -EINVAL;
330 if (video_is_registered(vdev))
331 ret = vdev->fops->write(filp, buf, sz, off);
332 if ((vdev->dev_debug & V4L2_DEV_DEBUG_FOP) &&
333 (vdev->dev_debug & V4L2_DEV_DEBUG_STREAMING))
334 dprintk("%s: write: %zd (%d)\n",
335 video_device_node_name(vdev), sz, ret);
336 return ret;
337 }
338
v4l2_poll(struct file * filp,struct poll_table_struct * poll)339 static __poll_t v4l2_poll(struct file *filp, struct poll_table_struct *poll)
340 {
341 struct video_device *vdev = video_devdata(filp);
342 __poll_t res = EPOLLERR | EPOLLHUP | EPOLLPRI;
343
344 if (video_is_registered(vdev)) {
345 if (!vdev->fops->poll)
346 res = DEFAULT_POLLMASK;
347 else
348 res = vdev->fops->poll(filp, poll);
349 }
350 if (vdev->dev_debug & V4L2_DEV_DEBUG_POLL)
351 dprintk("%s: poll: %08x %08x\n",
352 video_device_node_name(vdev), res,
353 poll_requested_events(poll));
354 return res;
355 }
356
v4l2_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)357 static long v4l2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
358 {
359 struct video_device *vdev = video_devdata(filp);
360 int ret = -ENODEV;
361
362 if (vdev->fops->unlocked_ioctl) {
363 if (video_is_registered(vdev))
364 ret = vdev->fops->unlocked_ioctl(filp, cmd, arg);
365 } else
366 ret = -ENOTTY;
367
368 return ret;
369 }
370
371 #ifdef CONFIG_MMU
372 #define v4l2_get_unmapped_area NULL
373 #else
v4l2_get_unmapped_area(struct file * filp,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)374 static unsigned long v4l2_get_unmapped_area(struct file *filp,
375 unsigned long addr, unsigned long len, unsigned long pgoff,
376 unsigned long flags)
377 {
378 struct video_device *vdev = video_devdata(filp);
379 int ret;
380
381 if (!vdev->fops->get_unmapped_area)
382 return -ENOSYS;
383 if (!video_is_registered(vdev))
384 return -ENODEV;
385 ret = vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags);
386 if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP)
387 dprintk("%s: get_unmapped_area (%d)\n",
388 video_device_node_name(vdev), ret);
389 return ret;
390 }
391 #endif
392
v4l2_mmap(struct file * filp,struct vm_area_struct * vm)393 static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm)
394 {
395 struct video_device *vdev = video_devdata(filp);
396 int ret = -ENODEV;
397
398 if (!vdev->fops->mmap)
399 return -ENODEV;
400 if (video_is_registered(vdev))
401 ret = vdev->fops->mmap(filp, vm);
402 if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP)
403 dprintk("%s: mmap (%d)\n",
404 video_device_node_name(vdev), ret);
405 return ret;
406 }
407
408 /* Override for the open function */
v4l2_open(struct inode * inode,struct file * filp)409 static int v4l2_open(struct inode *inode, struct file *filp)
410 {
411 struct video_device *vdev;
412 int ret = 0;
413
414 /* Check if the video device is available */
415 mutex_lock(&videodev_lock);
416 vdev = video_devdata(filp);
417 /* return ENODEV if the video device has already been removed. */
418 if (vdev == NULL || !video_is_registered(vdev)) {
419 mutex_unlock(&videodev_lock);
420 return -ENODEV;
421 }
422 /* and increase the device refcount */
423 video_get(vdev);
424 mutex_unlock(&videodev_lock);
425 if (vdev->fops->open) {
426 if (video_is_registered(vdev))
427 ret = vdev->fops->open(filp);
428 else
429 ret = -ENODEV;
430 }
431
432 if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP)
433 dprintk("%s: open (%d)\n",
434 video_device_node_name(vdev), ret);
435 /* decrease the refcount in case of an error */
436 if (ret)
437 video_put(vdev);
438 return ret;
439 }
440
441 /* Override for the release function */
v4l2_release(struct inode * inode,struct file * filp)442 static int v4l2_release(struct inode *inode, struct file *filp)
443 {
444 struct video_device *vdev = video_devdata(filp);
445 int ret = 0;
446
447 /*
448 * We need to serialize the release() with queueing new requests.
449 * The release() may trigger the cancellation of a streaming
450 * operation, and that should not be mixed with queueing a new
451 * request at the same time.
452 */
453 if (vdev->fops->release) {
454 if (v4l2_device_supports_requests(vdev->v4l2_dev)) {
455 mutex_lock(&vdev->v4l2_dev->mdev->req_queue_mutex);
456 ret = vdev->fops->release(filp);
457 mutex_unlock(&vdev->v4l2_dev->mdev->req_queue_mutex);
458 } else {
459 ret = vdev->fops->release(filp);
460 }
461 }
462
463 if (vdev->dev_debug & V4L2_DEV_DEBUG_FOP)
464 dprintk("%s: release\n",
465 video_device_node_name(vdev));
466
467 /* decrease the refcount unconditionally since the release()
468 return value is ignored. */
469 video_put(vdev);
470 return ret;
471 }
472
473 static const struct file_operations v4l2_fops = {
474 .owner = THIS_MODULE,
475 .read = v4l2_read,
476 .write = v4l2_write,
477 .open = v4l2_open,
478 .get_unmapped_area = v4l2_get_unmapped_area,
479 .mmap = v4l2_mmap,
480 .unlocked_ioctl = v4l2_ioctl,
481 #ifdef CONFIG_COMPAT
482 .compat_ioctl = v4l2_compat_ioctl32,
483 #endif
484 .release = v4l2_release,
485 .poll = v4l2_poll,
486 .llseek = no_llseek,
487 };
488
489 /**
490 * get_index - assign stream index number based on v4l2_dev
491 * @vdev: video_device to assign index number to, vdev->v4l2_dev should be assigned
492 *
493 * Note that when this is called the new device has not yet been registered
494 * in the video_device array, but it was able to obtain a minor number.
495 *
496 * This means that we can always obtain a free stream index number since
497 * the worst case scenario is that there are VIDEO_NUM_DEVICES - 1 slots in
498 * use of the video_device array.
499 *
500 * Returns a free index number.
501 */
get_index(struct video_device * vdev)502 static int get_index(struct video_device *vdev)
503 {
504 /* This can be static since this function is called with the global
505 videodev_lock held. */
506 static DECLARE_BITMAP(used, VIDEO_NUM_DEVICES);
507 int i;
508
509 bitmap_zero(used, VIDEO_NUM_DEVICES);
510
511 for (i = 0; i < VIDEO_NUM_DEVICES; i++) {
512 if (video_devices[i] != NULL &&
513 video_devices[i]->v4l2_dev == vdev->v4l2_dev) {
514 __set_bit(video_devices[i]->index, used);
515 }
516 }
517
518 return find_first_zero_bit(used, VIDEO_NUM_DEVICES);
519 }
520
521 #define SET_VALID_IOCTL(ops, cmd, op) \
522 do { if ((ops)->op) __set_bit(_IOC_NR(cmd), valid_ioctls); } while (0)
523
524 /* This determines which ioctls are actually implemented in the driver.
525 It's a one-time thing which simplifies video_ioctl2 as it can just do
526 a bit test.
527
528 Note that drivers can override this by setting bits to 1 in
529 vdev->valid_ioctls. If an ioctl is marked as 1 when this function is
530 called, then that ioctl will actually be marked as unimplemented.
531
532 It does that by first setting up the local valid_ioctls bitmap, and
533 at the end do a:
534
535 vdev->valid_ioctls = valid_ioctls & ~(vdev->valid_ioctls)
536 */
determine_valid_ioctls(struct video_device * vdev)537 static void determine_valid_ioctls(struct video_device *vdev)
538 {
539 const u32 vid_caps = V4L2_CAP_VIDEO_CAPTURE |
540 V4L2_CAP_VIDEO_CAPTURE_MPLANE |
541 V4L2_CAP_VIDEO_OUTPUT |
542 V4L2_CAP_VIDEO_OUTPUT_MPLANE |
543 V4L2_CAP_VIDEO_M2M | V4L2_CAP_VIDEO_M2M_MPLANE;
544 const u32 meta_caps = V4L2_CAP_META_CAPTURE |
545 V4L2_CAP_META_OUTPUT;
546 DECLARE_BITMAP(valid_ioctls, BASE_VIDIOC_PRIVATE);
547 const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops;
548 bool is_vid = vdev->vfl_type == VFL_TYPE_VIDEO &&
549 (vdev->device_caps & vid_caps);
550 bool is_vbi = vdev->vfl_type == VFL_TYPE_VBI;
551 bool is_radio = vdev->vfl_type == VFL_TYPE_RADIO;
552 bool is_sdr = vdev->vfl_type == VFL_TYPE_SDR;
553 bool is_tch = vdev->vfl_type == VFL_TYPE_TOUCH;
554 bool is_meta = vdev->vfl_type == VFL_TYPE_VIDEO &&
555 (vdev->device_caps & meta_caps);
556 bool is_rx = vdev->vfl_dir != VFL_DIR_TX;
557 bool is_tx = vdev->vfl_dir != VFL_DIR_RX;
558 bool is_io_mc = vdev->device_caps & V4L2_CAP_IO_MC;
559 bool has_streaming = vdev->device_caps & V4L2_CAP_STREAMING;
560
561 bitmap_zero(valid_ioctls, BASE_VIDIOC_PRIVATE);
562
563 /* vfl_type and vfl_dir independent ioctls */
564
565 SET_VALID_IOCTL(ops, VIDIOC_QUERYCAP, vidioc_querycap);
566 __set_bit(_IOC_NR(VIDIOC_G_PRIORITY), valid_ioctls);
567 __set_bit(_IOC_NR(VIDIOC_S_PRIORITY), valid_ioctls);
568
569 /* Note: the control handler can also be passed through the filehandle,
570 and that can't be tested here. If the bit for these control ioctls
571 is set, then the ioctl is valid. But if it is 0, then it can still
572 be valid if the filehandle passed the control handler. */
573 if (vdev->ctrl_handler || ops->vidioc_queryctrl)
574 __set_bit(_IOC_NR(VIDIOC_QUERYCTRL), valid_ioctls);
575 if (vdev->ctrl_handler || ops->vidioc_query_ext_ctrl)
576 __set_bit(_IOC_NR(VIDIOC_QUERY_EXT_CTRL), valid_ioctls);
577 if (vdev->ctrl_handler || ops->vidioc_g_ctrl || ops->vidioc_g_ext_ctrls)
578 __set_bit(_IOC_NR(VIDIOC_G_CTRL), valid_ioctls);
579 if (vdev->ctrl_handler || ops->vidioc_s_ctrl || ops->vidioc_s_ext_ctrls)
580 __set_bit(_IOC_NR(VIDIOC_S_CTRL), valid_ioctls);
581 if (vdev->ctrl_handler || ops->vidioc_g_ext_ctrls)
582 __set_bit(_IOC_NR(VIDIOC_G_EXT_CTRLS), valid_ioctls);
583 if (vdev->ctrl_handler || ops->vidioc_s_ext_ctrls)
584 __set_bit(_IOC_NR(VIDIOC_S_EXT_CTRLS), valid_ioctls);
585 if (vdev->ctrl_handler || ops->vidioc_try_ext_ctrls)
586 __set_bit(_IOC_NR(VIDIOC_TRY_EXT_CTRLS), valid_ioctls);
587 if (vdev->ctrl_handler || ops->vidioc_querymenu)
588 __set_bit(_IOC_NR(VIDIOC_QUERYMENU), valid_ioctls);
589 if (!is_tch) {
590 SET_VALID_IOCTL(ops, VIDIOC_G_FREQUENCY, vidioc_g_frequency);
591 SET_VALID_IOCTL(ops, VIDIOC_S_FREQUENCY, vidioc_s_frequency);
592 }
593 SET_VALID_IOCTL(ops, VIDIOC_LOG_STATUS, vidioc_log_status);
594 #ifdef CONFIG_VIDEO_ADV_DEBUG
595 __set_bit(_IOC_NR(VIDIOC_DBG_G_CHIP_INFO), valid_ioctls);
596 __set_bit(_IOC_NR(VIDIOC_DBG_G_REGISTER), valid_ioctls);
597 __set_bit(_IOC_NR(VIDIOC_DBG_S_REGISTER), valid_ioctls);
598 #endif
599 /* yes, really vidioc_subscribe_event */
600 SET_VALID_IOCTL(ops, VIDIOC_DQEVENT, vidioc_subscribe_event);
601 SET_VALID_IOCTL(ops, VIDIOC_SUBSCRIBE_EVENT, vidioc_subscribe_event);
602 SET_VALID_IOCTL(ops, VIDIOC_UNSUBSCRIBE_EVENT, vidioc_unsubscribe_event);
603 if (ops->vidioc_enum_freq_bands || ops->vidioc_g_tuner || ops->vidioc_g_modulator)
604 __set_bit(_IOC_NR(VIDIOC_ENUM_FREQ_BANDS), valid_ioctls);
605
606 if (is_vid) {
607 /* video specific ioctls */
608 if ((is_rx && (ops->vidioc_enum_fmt_vid_cap ||
609 ops->vidioc_enum_fmt_vid_overlay)) ||
610 (is_tx && ops->vidioc_enum_fmt_vid_out))
611 __set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls);
612 if ((is_rx && (ops->vidioc_g_fmt_vid_cap ||
613 ops->vidioc_g_fmt_vid_cap_mplane ||
614 ops->vidioc_g_fmt_vid_overlay)) ||
615 (is_tx && (ops->vidioc_g_fmt_vid_out ||
616 ops->vidioc_g_fmt_vid_out_mplane ||
617 ops->vidioc_g_fmt_vid_out_overlay)))
618 __set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls);
619 if ((is_rx && (ops->vidioc_s_fmt_vid_cap ||
620 ops->vidioc_s_fmt_vid_cap_mplane ||
621 ops->vidioc_s_fmt_vid_overlay)) ||
622 (is_tx && (ops->vidioc_s_fmt_vid_out ||
623 ops->vidioc_s_fmt_vid_out_mplane ||
624 ops->vidioc_s_fmt_vid_out_overlay)))
625 __set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls);
626 if ((is_rx && (ops->vidioc_try_fmt_vid_cap ||
627 ops->vidioc_try_fmt_vid_cap_mplane ||
628 ops->vidioc_try_fmt_vid_overlay)) ||
629 (is_tx && (ops->vidioc_try_fmt_vid_out ||
630 ops->vidioc_try_fmt_vid_out_mplane ||
631 ops->vidioc_try_fmt_vid_out_overlay)))
632 __set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls);
633 SET_VALID_IOCTL(ops, VIDIOC_OVERLAY, vidioc_overlay);
634 SET_VALID_IOCTL(ops, VIDIOC_G_FBUF, vidioc_g_fbuf);
635 SET_VALID_IOCTL(ops, VIDIOC_S_FBUF, vidioc_s_fbuf);
636 SET_VALID_IOCTL(ops, VIDIOC_G_JPEGCOMP, vidioc_g_jpegcomp);
637 SET_VALID_IOCTL(ops, VIDIOC_S_JPEGCOMP, vidioc_s_jpegcomp);
638 SET_VALID_IOCTL(ops, VIDIOC_G_ENC_INDEX, vidioc_g_enc_index);
639 SET_VALID_IOCTL(ops, VIDIOC_ENCODER_CMD, vidioc_encoder_cmd);
640 SET_VALID_IOCTL(ops, VIDIOC_TRY_ENCODER_CMD, vidioc_try_encoder_cmd);
641 SET_VALID_IOCTL(ops, VIDIOC_DECODER_CMD, vidioc_decoder_cmd);
642 SET_VALID_IOCTL(ops, VIDIOC_TRY_DECODER_CMD, vidioc_try_decoder_cmd);
643 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes);
644 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals);
645 if (ops->vidioc_g_selection) {
646 __set_bit(_IOC_NR(VIDIOC_G_CROP), valid_ioctls);
647 __set_bit(_IOC_NR(VIDIOC_CROPCAP), valid_ioctls);
648 }
649 if (ops->vidioc_s_selection)
650 __set_bit(_IOC_NR(VIDIOC_S_CROP), valid_ioctls);
651 SET_VALID_IOCTL(ops, VIDIOC_G_SELECTION, vidioc_g_selection);
652 SET_VALID_IOCTL(ops, VIDIOC_S_SELECTION, vidioc_s_selection);
653 }
654 if (is_meta && is_rx) {
655 /* metadata capture specific ioctls */
656 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FMT, vidioc_enum_fmt_meta_cap);
657 SET_VALID_IOCTL(ops, VIDIOC_G_FMT, vidioc_g_fmt_meta_cap);
658 SET_VALID_IOCTL(ops, VIDIOC_S_FMT, vidioc_s_fmt_meta_cap);
659 SET_VALID_IOCTL(ops, VIDIOC_TRY_FMT, vidioc_try_fmt_meta_cap);
660 } else if (is_meta && is_tx) {
661 /* metadata output specific ioctls */
662 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FMT, vidioc_enum_fmt_meta_out);
663 SET_VALID_IOCTL(ops, VIDIOC_G_FMT, vidioc_g_fmt_meta_out);
664 SET_VALID_IOCTL(ops, VIDIOC_S_FMT, vidioc_s_fmt_meta_out);
665 SET_VALID_IOCTL(ops, VIDIOC_TRY_FMT, vidioc_try_fmt_meta_out);
666 }
667 if (is_vbi) {
668 /* vbi specific ioctls */
669 if ((is_rx && (ops->vidioc_g_fmt_vbi_cap ||
670 ops->vidioc_g_fmt_sliced_vbi_cap)) ||
671 (is_tx && (ops->vidioc_g_fmt_vbi_out ||
672 ops->vidioc_g_fmt_sliced_vbi_out)))
673 __set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls);
674 if ((is_rx && (ops->vidioc_s_fmt_vbi_cap ||
675 ops->vidioc_s_fmt_sliced_vbi_cap)) ||
676 (is_tx && (ops->vidioc_s_fmt_vbi_out ||
677 ops->vidioc_s_fmt_sliced_vbi_out)))
678 __set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls);
679 if ((is_rx && (ops->vidioc_try_fmt_vbi_cap ||
680 ops->vidioc_try_fmt_sliced_vbi_cap)) ||
681 (is_tx && (ops->vidioc_try_fmt_vbi_out ||
682 ops->vidioc_try_fmt_sliced_vbi_out)))
683 __set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls);
684 SET_VALID_IOCTL(ops, VIDIOC_G_SLICED_VBI_CAP, vidioc_g_sliced_vbi_cap);
685 } else if (is_tch) {
686 /* touch specific ioctls */
687 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FMT, vidioc_enum_fmt_vid_cap);
688 SET_VALID_IOCTL(ops, VIDIOC_G_FMT, vidioc_g_fmt_vid_cap);
689 SET_VALID_IOCTL(ops, VIDIOC_S_FMT, vidioc_s_fmt_vid_cap);
690 SET_VALID_IOCTL(ops, VIDIOC_TRY_FMT, vidioc_try_fmt_vid_cap);
691 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes);
692 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals);
693 SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input);
694 SET_VALID_IOCTL(ops, VIDIOC_G_INPUT, vidioc_g_input);
695 SET_VALID_IOCTL(ops, VIDIOC_S_INPUT, vidioc_s_input);
696 SET_VALID_IOCTL(ops, VIDIOC_G_PARM, vidioc_g_parm);
697 SET_VALID_IOCTL(ops, VIDIOC_S_PARM, vidioc_s_parm);
698 } else if (is_sdr && is_rx) {
699 /* SDR receiver specific ioctls */
700 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FMT, vidioc_enum_fmt_sdr_cap);
701 SET_VALID_IOCTL(ops, VIDIOC_G_FMT, vidioc_g_fmt_sdr_cap);
702 SET_VALID_IOCTL(ops, VIDIOC_S_FMT, vidioc_s_fmt_sdr_cap);
703 SET_VALID_IOCTL(ops, VIDIOC_TRY_FMT, vidioc_try_fmt_sdr_cap);
704 } else if (is_sdr && is_tx) {
705 /* SDR transmitter specific ioctls */
706 SET_VALID_IOCTL(ops, VIDIOC_ENUM_FMT, vidioc_enum_fmt_sdr_out);
707 SET_VALID_IOCTL(ops, VIDIOC_G_FMT, vidioc_g_fmt_sdr_out);
708 SET_VALID_IOCTL(ops, VIDIOC_S_FMT, vidioc_s_fmt_sdr_out);
709 SET_VALID_IOCTL(ops, VIDIOC_TRY_FMT, vidioc_try_fmt_sdr_out);
710 }
711
712 if (has_streaming) {
713 /* ioctls valid for streaming I/O */
714 SET_VALID_IOCTL(ops, VIDIOC_REQBUFS, vidioc_reqbufs);
715 SET_VALID_IOCTL(ops, VIDIOC_QUERYBUF, vidioc_querybuf);
716 SET_VALID_IOCTL(ops, VIDIOC_QBUF, vidioc_qbuf);
717 SET_VALID_IOCTL(ops, VIDIOC_EXPBUF, vidioc_expbuf);
718 SET_VALID_IOCTL(ops, VIDIOC_DQBUF, vidioc_dqbuf);
719 SET_VALID_IOCTL(ops, VIDIOC_CREATE_BUFS, vidioc_create_bufs);
720 SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, vidioc_prepare_buf);
721 SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon);
722 SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff);
723 }
724
725 if (is_vid || is_vbi || is_meta) {
726 /* ioctls valid for video, vbi and metadata */
727 if (ops->vidioc_s_std)
728 __set_bit(_IOC_NR(VIDIOC_ENUMSTD), valid_ioctls);
729 SET_VALID_IOCTL(ops, VIDIOC_S_STD, vidioc_s_std);
730 SET_VALID_IOCTL(ops, VIDIOC_G_STD, vidioc_g_std);
731 if (is_rx) {
732 SET_VALID_IOCTL(ops, VIDIOC_QUERYSTD, vidioc_querystd);
733 if (is_io_mc) {
734 __set_bit(_IOC_NR(VIDIOC_ENUMINPUT), valid_ioctls);
735 __set_bit(_IOC_NR(VIDIOC_G_INPUT), valid_ioctls);
736 __set_bit(_IOC_NR(VIDIOC_S_INPUT), valid_ioctls);
737 } else {
738 SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input);
739 SET_VALID_IOCTL(ops, VIDIOC_G_INPUT, vidioc_g_input);
740 SET_VALID_IOCTL(ops, VIDIOC_S_INPUT, vidioc_s_input);
741 }
742 SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDIO, vidioc_enumaudio);
743 SET_VALID_IOCTL(ops, VIDIOC_G_AUDIO, vidioc_g_audio);
744 SET_VALID_IOCTL(ops, VIDIOC_S_AUDIO, vidioc_s_audio);
745 SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings);
746 SET_VALID_IOCTL(ops, VIDIOC_S_EDID, vidioc_s_edid);
747 }
748 if (is_tx) {
749 if (is_io_mc) {
750 __set_bit(_IOC_NR(VIDIOC_ENUMOUTPUT), valid_ioctls);
751 __set_bit(_IOC_NR(VIDIOC_G_OUTPUT), valid_ioctls);
752 __set_bit(_IOC_NR(VIDIOC_S_OUTPUT), valid_ioctls);
753 } else {
754 SET_VALID_IOCTL(ops, VIDIOC_ENUMOUTPUT, vidioc_enum_output);
755 SET_VALID_IOCTL(ops, VIDIOC_G_OUTPUT, vidioc_g_output);
756 SET_VALID_IOCTL(ops, VIDIOC_S_OUTPUT, vidioc_s_output);
757 }
758 SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDOUT, vidioc_enumaudout);
759 SET_VALID_IOCTL(ops, VIDIOC_G_AUDOUT, vidioc_g_audout);
760 SET_VALID_IOCTL(ops, VIDIOC_S_AUDOUT, vidioc_s_audout);
761 }
762 if (ops->vidioc_g_parm || ops->vidioc_g_std)
763 __set_bit(_IOC_NR(VIDIOC_G_PARM), valid_ioctls);
764 SET_VALID_IOCTL(ops, VIDIOC_S_PARM, vidioc_s_parm);
765 SET_VALID_IOCTL(ops, VIDIOC_S_DV_TIMINGS, vidioc_s_dv_timings);
766 SET_VALID_IOCTL(ops, VIDIOC_G_DV_TIMINGS, vidioc_g_dv_timings);
767 SET_VALID_IOCTL(ops, VIDIOC_ENUM_DV_TIMINGS, vidioc_enum_dv_timings);
768 SET_VALID_IOCTL(ops, VIDIOC_DV_TIMINGS_CAP, vidioc_dv_timings_cap);
769 SET_VALID_IOCTL(ops, VIDIOC_G_EDID, vidioc_g_edid);
770 }
771 if (is_tx && (is_radio || is_sdr)) {
772 /* radio transmitter only ioctls */
773 SET_VALID_IOCTL(ops, VIDIOC_G_MODULATOR, vidioc_g_modulator);
774 SET_VALID_IOCTL(ops, VIDIOC_S_MODULATOR, vidioc_s_modulator);
775 }
776 if (is_rx && !is_tch) {
777 /* receiver only ioctls */
778 SET_VALID_IOCTL(ops, VIDIOC_G_TUNER, vidioc_g_tuner);
779 SET_VALID_IOCTL(ops, VIDIOC_S_TUNER, vidioc_s_tuner);
780 SET_VALID_IOCTL(ops, VIDIOC_S_HW_FREQ_SEEK, vidioc_s_hw_freq_seek);
781 }
782
783 bitmap_andnot(vdev->valid_ioctls, valid_ioctls, vdev->valid_ioctls,
784 BASE_VIDIOC_PRIVATE);
785 }
786
video_register_media_controller(struct video_device * vdev)787 static int video_register_media_controller(struct video_device *vdev)
788 {
789 #if defined(CONFIG_MEDIA_CONTROLLER)
790 u32 intf_type;
791 int ret;
792
793 /* Memory-to-memory devices are more complex and use
794 * their own function to register its mc entities.
795 */
796 if (!vdev->v4l2_dev->mdev || vdev->vfl_dir == VFL_DIR_M2M)
797 return 0;
798
799 vdev->entity.obj_type = MEDIA_ENTITY_TYPE_VIDEO_DEVICE;
800 vdev->entity.function = MEDIA_ENT_F_UNKNOWN;
801
802 switch (vdev->vfl_type) {
803 case VFL_TYPE_VIDEO:
804 intf_type = MEDIA_INTF_T_V4L_VIDEO;
805 vdev->entity.function = MEDIA_ENT_F_IO_V4L;
806 break;
807 case VFL_TYPE_VBI:
808 intf_type = MEDIA_INTF_T_V4L_VBI;
809 vdev->entity.function = MEDIA_ENT_F_IO_VBI;
810 break;
811 case VFL_TYPE_SDR:
812 intf_type = MEDIA_INTF_T_V4L_SWRADIO;
813 vdev->entity.function = MEDIA_ENT_F_IO_SWRADIO;
814 break;
815 case VFL_TYPE_TOUCH:
816 intf_type = MEDIA_INTF_T_V4L_TOUCH;
817 vdev->entity.function = MEDIA_ENT_F_IO_V4L;
818 break;
819 case VFL_TYPE_RADIO:
820 intf_type = MEDIA_INTF_T_V4L_RADIO;
821 /*
822 * Radio doesn't have an entity at the V4L2 side to represent
823 * radio input or output. Instead, the audio input/output goes
824 * via either physical wires or ALSA.
825 */
826 break;
827 case VFL_TYPE_SUBDEV:
828 intf_type = MEDIA_INTF_T_V4L_SUBDEV;
829 /* Entity will be created via v4l2_device_register_subdev() */
830 break;
831 default:
832 return 0;
833 }
834
835 if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) {
836 vdev->entity.name = vdev->name;
837
838 /* Needed just for backward compatibility with legacy MC API */
839 vdev->entity.info.dev.major = VIDEO_MAJOR;
840 vdev->entity.info.dev.minor = vdev->minor;
841
842 ret = media_device_register_entity(vdev->v4l2_dev->mdev,
843 &vdev->entity);
844 if (ret < 0) {
845 pr_warn("%s: media_device_register_entity failed\n",
846 __func__);
847 return ret;
848 }
849 }
850
851 vdev->intf_devnode = media_devnode_create(vdev->v4l2_dev->mdev,
852 intf_type,
853 0, VIDEO_MAJOR,
854 vdev->minor);
855 if (!vdev->intf_devnode) {
856 media_device_unregister_entity(&vdev->entity);
857 return -ENOMEM;
858 }
859
860 if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) {
861 struct media_link *link;
862
863 link = media_create_intf_link(&vdev->entity,
864 &vdev->intf_devnode->intf,
865 MEDIA_LNK_FL_ENABLED |
866 MEDIA_LNK_FL_IMMUTABLE);
867 if (!link) {
868 media_devnode_remove(vdev->intf_devnode);
869 media_device_unregister_entity(&vdev->entity);
870 return -ENOMEM;
871 }
872 }
873
874 /* FIXME: how to create the other interface links? */
875
876 #endif
877 return 0;
878 }
879
__video_register_device(struct video_device * vdev,enum vfl_devnode_type type,int nr,int warn_if_nr_in_use,struct module * owner)880 int __video_register_device(struct video_device *vdev,
881 enum vfl_devnode_type type,
882 int nr, int warn_if_nr_in_use,
883 struct module *owner)
884 {
885 int i = 0;
886 int ret;
887 int minor_offset = 0;
888 int minor_cnt = VIDEO_NUM_DEVICES;
889 const char *name_base;
890
891 /* A minor value of -1 marks this video device as never
892 having been registered */
893 vdev->minor = -1;
894
895 /* the release callback MUST be present */
896 if (WARN_ON(!vdev->release))
897 return -EINVAL;
898 /* the v4l2_dev pointer MUST be present */
899 if (WARN_ON(!vdev->v4l2_dev))
900 return -EINVAL;
901 /* the device_caps field MUST be set for all but subdevs */
902 if (WARN_ON(type != VFL_TYPE_SUBDEV && !vdev->device_caps))
903 return -EINVAL;
904
905 /* v4l2_fh support */
906 spin_lock_init(&vdev->fh_lock);
907 INIT_LIST_HEAD(&vdev->fh_list);
908
909 /* Part 1: check device type */
910 switch (type) {
911 case VFL_TYPE_VIDEO:
912 name_base = "video";
913 break;
914 case VFL_TYPE_VBI:
915 name_base = "vbi";
916 break;
917 case VFL_TYPE_RADIO:
918 name_base = "radio";
919 break;
920 case VFL_TYPE_SUBDEV:
921 name_base = "v4l-subdev";
922 break;
923 case VFL_TYPE_SDR:
924 /* Use device name 'swradio' because 'sdr' was already taken. */
925 name_base = "swradio";
926 break;
927 case VFL_TYPE_TOUCH:
928 name_base = "v4l-touch";
929 break;
930 default:
931 pr_err("%s called with unknown type: %d\n",
932 __func__, type);
933 return -EINVAL;
934 }
935
936 vdev->vfl_type = type;
937 vdev->cdev = NULL;
938 if (vdev->dev_parent == NULL)
939 vdev->dev_parent = vdev->v4l2_dev->dev;
940 if (vdev->ctrl_handler == NULL)
941 vdev->ctrl_handler = vdev->v4l2_dev->ctrl_handler;
942 /* If the prio state pointer is NULL, then use the v4l2_device
943 prio state. */
944 if (vdev->prio == NULL)
945 vdev->prio = &vdev->v4l2_dev->prio;
946
947 /* Part 2: find a free minor, device node number and device index. */
948 #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES
949 /* Keep the ranges for the first four types for historical
950 * reasons.
951 * Newer devices (not yet in place) should use the range
952 * of 128-191 and just pick the first free minor there
953 * (new style). */
954 switch (type) {
955 case VFL_TYPE_VIDEO:
956 minor_offset = 0;
957 minor_cnt = 64;
958 break;
959 case VFL_TYPE_RADIO:
960 minor_offset = 64;
961 minor_cnt = 64;
962 break;
963 case VFL_TYPE_VBI:
964 minor_offset = 224;
965 minor_cnt = 32;
966 break;
967 default:
968 minor_offset = 128;
969 minor_cnt = 64;
970 break;
971 }
972 #endif
973
974 /* Pick a device node number */
975 mutex_lock(&videodev_lock);
976 nr = devnode_find(vdev, nr == -1 ? 0 : nr, minor_cnt);
977 if (nr == minor_cnt)
978 nr = devnode_find(vdev, 0, minor_cnt);
979 if (nr == minor_cnt) {
980 pr_err("could not get a free device node number\n");
981 mutex_unlock(&videodev_lock);
982 return -ENFILE;
983 }
984 #ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES
985 /* 1-on-1 mapping of device node number to minor number */
986 i = nr;
987 #else
988 /* The device node number and minor numbers are independent, so
989 we just find the first free minor number. */
990 for (i = 0; i < VIDEO_NUM_DEVICES; i++)
991 if (video_devices[i] == NULL)
992 break;
993 if (i == VIDEO_NUM_DEVICES) {
994 mutex_unlock(&videodev_lock);
995 pr_err("could not get a free minor\n");
996 return -ENFILE;
997 }
998 #endif
999 vdev->minor = i + minor_offset;
1000 vdev->num = nr;
1001
1002 /* Should not happen since we thought this minor was free */
1003 if (WARN_ON(video_devices[vdev->minor])) {
1004 mutex_unlock(&videodev_lock);
1005 pr_err("video_device not empty!\n");
1006 return -ENFILE;
1007 }
1008 devnode_set(vdev);
1009 vdev->index = get_index(vdev);
1010 video_devices[vdev->minor] = vdev;
1011 mutex_unlock(&videodev_lock);
1012
1013 if (vdev->ioctl_ops)
1014 determine_valid_ioctls(vdev);
1015
1016 /* Part 3: Initialize the character device */
1017 vdev->cdev = cdev_alloc();
1018 if (vdev->cdev == NULL) {
1019 ret = -ENOMEM;
1020 goto cleanup;
1021 }
1022 vdev->cdev->ops = &v4l2_fops;
1023 vdev->cdev->owner = owner;
1024 ret = cdev_add(vdev->cdev, MKDEV(VIDEO_MAJOR, vdev->minor), 1);
1025 if (ret < 0) {
1026 pr_err("%s: cdev_add failed\n", __func__);
1027 kfree(vdev->cdev);
1028 vdev->cdev = NULL;
1029 goto cleanup;
1030 }
1031
1032 /* Part 4: register the device with sysfs */
1033 vdev->dev.class = &video_class;
1034 vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor);
1035 vdev->dev.parent = vdev->dev_parent;
1036 dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num);
1037 mutex_lock(&videodev_lock);
1038 ret = device_register(&vdev->dev);
1039 if (ret < 0) {
1040 mutex_unlock(&videodev_lock);
1041 pr_err("%s: device_register failed\n", __func__);
1042 goto cleanup;
1043 }
1044 /* Register the release callback that will be called when the last
1045 reference to the device goes away. */
1046 vdev->dev.release = v4l2_device_release;
1047
1048 if (nr != -1 && nr != vdev->num && warn_if_nr_in_use)
1049 pr_warn("%s: requested %s%d, got %s\n", __func__,
1050 name_base, nr, video_device_node_name(vdev));
1051
1052 /* Increase v4l2_device refcount */
1053 v4l2_device_get(vdev->v4l2_dev);
1054
1055 /* Part 5: Register the entity. */
1056 ret = video_register_media_controller(vdev);
1057
1058 /* Part 6: Activate this minor. The char device can now be used. */
1059 set_bit(V4L2_FL_REGISTERED, &vdev->flags);
1060 mutex_unlock(&videodev_lock);
1061
1062 return 0;
1063
1064 cleanup:
1065 mutex_lock(&videodev_lock);
1066 if (vdev->cdev)
1067 cdev_del(vdev->cdev);
1068 video_devices[vdev->minor] = NULL;
1069 devnode_clear(vdev);
1070 mutex_unlock(&videodev_lock);
1071 /* Mark this video device as never having been registered. */
1072 vdev->minor = -1;
1073 return ret;
1074 }
1075 EXPORT_SYMBOL(__video_register_device);
1076
1077 /**
1078 * video_unregister_device - unregister a video4linux device
1079 * @vdev: the device to unregister
1080 *
1081 * This unregisters the passed device. Future open calls will
1082 * be met with errors.
1083 */
video_unregister_device(struct video_device * vdev)1084 void video_unregister_device(struct video_device *vdev)
1085 {
1086 /* Check if vdev was ever registered at all */
1087 if (!vdev || !video_is_registered(vdev))
1088 return;
1089
1090 mutex_lock(&videodev_lock);
1091 /* This must be in a critical section to prevent a race with v4l2_open.
1092 * Once this bit has been cleared video_get may never be called again.
1093 */
1094 clear_bit(V4L2_FL_REGISTERED, &vdev->flags);
1095 mutex_unlock(&videodev_lock);
1096 if (test_bit(V4L2_FL_USES_V4L2_FH, &vdev->flags))
1097 v4l2_event_wake_all(vdev);
1098 device_unregister(&vdev->dev);
1099 }
1100 EXPORT_SYMBOL(video_unregister_device);
1101
1102 #if defined(CONFIG_MEDIA_CONTROLLER)
1103
video_device_pipeline_start(struct video_device * vdev,struct media_pipeline * pipe)1104 __must_check int video_device_pipeline_start(struct video_device *vdev,
1105 struct media_pipeline *pipe)
1106 {
1107 struct media_entity *entity = &vdev->entity;
1108
1109 if (entity->num_pads != 1)
1110 return -ENODEV;
1111
1112 return media_pipeline_start(&entity->pads[0], pipe);
1113 }
1114 EXPORT_SYMBOL_GPL(video_device_pipeline_start);
1115
__video_device_pipeline_start(struct video_device * vdev,struct media_pipeline * pipe)1116 __must_check int __video_device_pipeline_start(struct video_device *vdev,
1117 struct media_pipeline *pipe)
1118 {
1119 struct media_entity *entity = &vdev->entity;
1120
1121 if (entity->num_pads != 1)
1122 return -ENODEV;
1123
1124 return __media_pipeline_start(&entity->pads[0], pipe);
1125 }
1126 EXPORT_SYMBOL_GPL(__video_device_pipeline_start);
1127
video_device_pipeline_stop(struct video_device * vdev)1128 void video_device_pipeline_stop(struct video_device *vdev)
1129 {
1130 struct media_entity *entity = &vdev->entity;
1131
1132 if (WARN_ON(entity->num_pads != 1))
1133 return;
1134
1135 return media_pipeline_stop(&entity->pads[0]);
1136 }
1137 EXPORT_SYMBOL_GPL(video_device_pipeline_stop);
1138
__video_device_pipeline_stop(struct video_device * vdev)1139 void __video_device_pipeline_stop(struct video_device *vdev)
1140 {
1141 struct media_entity *entity = &vdev->entity;
1142
1143 if (WARN_ON(entity->num_pads != 1))
1144 return;
1145
1146 return __media_pipeline_stop(&entity->pads[0]);
1147 }
1148 EXPORT_SYMBOL_GPL(__video_device_pipeline_stop);
1149
video_device_pipeline_alloc_start(struct video_device * vdev)1150 __must_check int video_device_pipeline_alloc_start(struct video_device *vdev)
1151 {
1152 struct media_entity *entity = &vdev->entity;
1153
1154 if (entity->num_pads != 1)
1155 return -ENODEV;
1156
1157 return media_pipeline_alloc_start(&entity->pads[0]);
1158 }
1159 EXPORT_SYMBOL_GPL(video_device_pipeline_alloc_start);
1160
video_device_pipeline(struct video_device * vdev)1161 struct media_pipeline *video_device_pipeline(struct video_device *vdev)
1162 {
1163 struct media_entity *entity = &vdev->entity;
1164
1165 if (WARN_ON(entity->num_pads != 1))
1166 return NULL;
1167
1168 return media_pad_pipeline(&entity->pads[0]);
1169 }
1170 EXPORT_SYMBOL_GPL(video_device_pipeline);
1171
1172 #endif /* CONFIG_MEDIA_CONTROLLER */
1173
1174 /*
1175 * Initialise video for linux
1176 */
videodev_init(void)1177 static int __init videodev_init(void)
1178 {
1179 dev_t dev = MKDEV(VIDEO_MAJOR, 0);
1180 int ret;
1181
1182 pr_info("Linux video capture interface: v2.00\n");
1183 ret = register_chrdev_region(dev, VIDEO_NUM_DEVICES, VIDEO_NAME);
1184 if (ret < 0) {
1185 pr_warn("videodev: unable to get major %d\n",
1186 VIDEO_MAJOR);
1187 return ret;
1188 }
1189
1190 ret = class_register(&video_class);
1191 if (ret < 0) {
1192 unregister_chrdev_region(dev, VIDEO_NUM_DEVICES);
1193 pr_warn("video_dev: class_register failed\n");
1194 return -EIO;
1195 }
1196
1197 return 0;
1198 }
1199
videodev_exit(void)1200 static void __exit videodev_exit(void)
1201 {
1202 dev_t dev = MKDEV(VIDEO_MAJOR, 0);
1203
1204 class_unregister(&video_class);
1205 unregister_chrdev_region(dev, VIDEO_NUM_DEVICES);
1206 }
1207
1208 subsys_initcall(videodev_init);
1209 module_exit(videodev_exit)
1210
1211 MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@kernel.org>, Bill Dirks, Justin Schoeman, Gerd Knorr");
1212 MODULE_DESCRIPTION("Video4Linux2 core driver");
1213 MODULE_LICENSE("GPL");
1214 MODULE_ALIAS_CHARDEV_MAJOR(VIDEO_MAJOR);
1215