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![Hans Verkuil](/assets/img/avatar_default.png)
Rename the function v4l2_dont_use_lock to v4l2_disable_ioctl_locking, and rename v4l2_dont_use_cmd to v4l2_disable_ioctl. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
991 lines
30 KiB
C
991 lines
30 KiB
C
/*
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* Video capture interface for Linux version 2
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*
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* A generic video device interface for the LINUX operating system
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* using a set of device structures/vectors for low level operations.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Alan Cox, <alan@lxorguk.ukuu.org.uk> (version 1)
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* Mauro Carvalho Chehab <mchehab@infradead.org> (version 2)
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*
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* Fixes: 20000516 Claudio Matsuoka <claudio@conectiva.com>
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* - Added procfs support
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/kmod.h>
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#include <linux/slab.h>
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#include <asm/uaccess.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ioctl.h>
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#define VIDEO_NUM_DEVICES 256
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#define VIDEO_NAME "video4linux"
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/*
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* sysfs stuff
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*/
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static ssize_t show_index(struct device *cd,
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struct device_attribute *attr, char *buf)
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{
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struct video_device *vdev = to_video_device(cd);
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return sprintf(buf, "%i\n", vdev->index);
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}
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static ssize_t show_name(struct device *cd,
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struct device_attribute *attr, char *buf)
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{
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struct video_device *vdev = to_video_device(cd);
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return sprintf(buf, "%.*s\n", (int)sizeof(vdev->name), vdev->name);
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}
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static struct device_attribute video_device_attrs[] = {
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__ATTR(name, S_IRUGO, show_name, NULL),
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__ATTR(index, S_IRUGO, show_index, NULL),
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__ATTR_NULL
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};
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/*
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* Active devices
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*/
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static struct video_device *video_device[VIDEO_NUM_DEVICES];
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static DEFINE_MUTEX(videodev_lock);
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static DECLARE_BITMAP(devnode_nums[VFL_TYPE_MAX], VIDEO_NUM_DEVICES);
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/* Device node utility functions */
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/* Note: these utility functions all assume that vfl_type is in the range
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[0, VFL_TYPE_MAX-1]. */
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#ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES
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/* Return the bitmap corresponding to vfl_type. */
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static inline unsigned long *devnode_bits(int vfl_type)
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{
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/* Any types not assigned to fixed minor ranges must be mapped to
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one single bitmap for the purposes of finding a free node number
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since all those unassigned types use the same minor range. */
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int idx = (vfl_type > VFL_TYPE_RADIO) ? VFL_TYPE_MAX - 1 : vfl_type;
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return devnode_nums[idx];
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}
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#else
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/* Return the bitmap corresponding to vfl_type. */
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static inline unsigned long *devnode_bits(int vfl_type)
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{
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return devnode_nums[vfl_type];
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}
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#endif
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/* Mark device node number vdev->num as used */
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static inline void devnode_set(struct video_device *vdev)
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{
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set_bit(vdev->num, devnode_bits(vdev->vfl_type));
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}
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/* Mark device node number vdev->num as unused */
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static inline void devnode_clear(struct video_device *vdev)
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{
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clear_bit(vdev->num, devnode_bits(vdev->vfl_type));
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}
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/* Try to find a free device node number in the range [from, to> */
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static inline int devnode_find(struct video_device *vdev, int from, int to)
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{
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return find_next_zero_bit(devnode_bits(vdev->vfl_type), to, from);
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}
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struct video_device *video_device_alloc(void)
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{
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return kzalloc(sizeof(struct video_device), GFP_KERNEL);
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}
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EXPORT_SYMBOL(video_device_alloc);
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void video_device_release(struct video_device *vdev)
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{
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kfree(vdev);
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}
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EXPORT_SYMBOL(video_device_release);
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void video_device_release_empty(struct video_device *vdev)
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{
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/* Do nothing */
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/* Only valid when the video_device struct is a static. */
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}
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EXPORT_SYMBOL(video_device_release_empty);
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static inline void video_get(struct video_device *vdev)
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{
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get_device(&vdev->dev);
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}
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static inline void video_put(struct video_device *vdev)
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{
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put_device(&vdev->dev);
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}
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/* Called when the last user of the video device exits. */
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static void v4l2_device_release(struct device *cd)
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{
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struct video_device *vdev = to_video_device(cd);
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struct v4l2_device *v4l2_dev = vdev->v4l2_dev;
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mutex_lock(&videodev_lock);
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if (WARN_ON(video_device[vdev->minor] != vdev)) {
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/* should not happen */
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mutex_unlock(&videodev_lock);
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return;
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}
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/* Free up this device for reuse */
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video_device[vdev->minor] = NULL;
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/* Delete the cdev on this minor as well */
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cdev_del(vdev->cdev);
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/* Just in case some driver tries to access this from
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the release() callback. */
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vdev->cdev = NULL;
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/* Mark device node number as free */
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devnode_clear(vdev);
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mutex_unlock(&videodev_lock);
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#if defined(CONFIG_MEDIA_CONTROLLER)
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if (v4l2_dev && v4l2_dev->mdev &&
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vdev->vfl_type != VFL_TYPE_SUBDEV)
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media_device_unregister_entity(&vdev->entity);
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#endif
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/* Do not call v4l2_device_put if there is no release callback set.
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* Drivers that have no v4l2_device release callback might free the
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* v4l2_dev instance in the video_device release callback below, so we
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* must perform this check here.
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*
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* TODO: In the long run all drivers that use v4l2_device should use the
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* v4l2_device release callback. This check will then be unnecessary.
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*/
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if (v4l2_dev && v4l2_dev->release == NULL)
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v4l2_dev = NULL;
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/* Release video_device and perform other
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cleanups as needed. */
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vdev->release(vdev);
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/* Decrease v4l2_device refcount */
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if (v4l2_dev)
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v4l2_device_put(v4l2_dev);
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}
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static struct class video_class = {
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.name = VIDEO_NAME,
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.dev_attrs = video_device_attrs,
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};
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struct video_device *video_devdata(struct file *file)
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{
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return video_device[iminor(file->f_path.dentry->d_inode)];
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}
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EXPORT_SYMBOL(video_devdata);
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/* Priority handling */
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static inline bool prio_is_valid(enum v4l2_priority prio)
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{
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return prio == V4L2_PRIORITY_BACKGROUND ||
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prio == V4L2_PRIORITY_INTERACTIVE ||
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prio == V4L2_PRIORITY_RECORD;
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}
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void v4l2_prio_init(struct v4l2_prio_state *global)
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{
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memset(global, 0, sizeof(*global));
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}
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EXPORT_SYMBOL(v4l2_prio_init);
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int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local,
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enum v4l2_priority new)
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{
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if (!prio_is_valid(new))
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return -EINVAL;
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if (*local == new)
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return 0;
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atomic_inc(&global->prios[new]);
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if (prio_is_valid(*local))
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atomic_dec(&global->prios[*local]);
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*local = new;
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return 0;
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}
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EXPORT_SYMBOL(v4l2_prio_change);
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void v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local)
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{
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v4l2_prio_change(global, local, V4L2_PRIORITY_DEFAULT);
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}
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EXPORT_SYMBOL(v4l2_prio_open);
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void v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority local)
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{
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if (prio_is_valid(local))
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atomic_dec(&global->prios[local]);
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}
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EXPORT_SYMBOL(v4l2_prio_close);
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enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global)
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{
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if (atomic_read(&global->prios[V4L2_PRIORITY_RECORD]) > 0)
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return V4L2_PRIORITY_RECORD;
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if (atomic_read(&global->prios[V4L2_PRIORITY_INTERACTIVE]) > 0)
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return V4L2_PRIORITY_INTERACTIVE;
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if (atomic_read(&global->prios[V4L2_PRIORITY_BACKGROUND]) > 0)
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return V4L2_PRIORITY_BACKGROUND;
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return V4L2_PRIORITY_UNSET;
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}
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EXPORT_SYMBOL(v4l2_prio_max);
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int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority local)
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{
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return (local < v4l2_prio_max(global)) ? -EBUSY : 0;
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}
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EXPORT_SYMBOL(v4l2_prio_check);
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static ssize_t v4l2_read(struct file *filp, char __user *buf,
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size_t sz, loff_t *off)
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{
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struct video_device *vdev = video_devdata(filp);
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int ret = -ENODEV;
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if (!vdev->fops->read)
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return -EINVAL;
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if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) &&
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mutex_lock_interruptible(vdev->lock))
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return -ERESTARTSYS;
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if (video_is_registered(vdev))
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ret = vdev->fops->read(filp, buf, sz, off);
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if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
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mutex_unlock(vdev->lock);
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return ret;
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}
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static ssize_t v4l2_write(struct file *filp, const char __user *buf,
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size_t sz, loff_t *off)
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{
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struct video_device *vdev = video_devdata(filp);
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int ret = -ENODEV;
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if (!vdev->fops->write)
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return -EINVAL;
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if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) &&
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mutex_lock_interruptible(vdev->lock))
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return -ERESTARTSYS;
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if (video_is_registered(vdev))
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ret = vdev->fops->write(filp, buf, sz, off);
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if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
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mutex_unlock(vdev->lock);
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return ret;
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}
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static unsigned int v4l2_poll(struct file *filp, struct poll_table_struct *poll)
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{
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struct video_device *vdev = video_devdata(filp);
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int ret = POLLERR | POLLHUP;
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if (!vdev->fops->poll)
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return DEFAULT_POLLMASK;
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if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
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mutex_lock(vdev->lock);
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if (video_is_registered(vdev))
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ret = vdev->fops->poll(filp, poll);
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if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
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mutex_unlock(vdev->lock);
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return ret;
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}
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static long v4l2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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struct video_device *vdev = video_devdata(filp);
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int ret = -ENODEV;
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if (vdev->fops->unlocked_ioctl) {
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bool locked = false;
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if (vdev->lock) {
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/* always lock unless the cmd is marked as "don't use lock" */
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locked = !v4l2_is_known_ioctl(cmd) ||
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!test_bit(_IOC_NR(cmd), vdev->disable_locking);
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if (locked && mutex_lock_interruptible(vdev->lock))
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return -ERESTARTSYS;
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}
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if (video_is_registered(vdev))
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ret = vdev->fops->unlocked_ioctl(filp, cmd, arg);
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if (locked)
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mutex_unlock(vdev->lock);
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} else if (vdev->fops->ioctl) {
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/* This code path is a replacement for the BKL. It is a major
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* hack but it will have to do for those drivers that are not
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* yet converted to use unlocked_ioctl.
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*
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* There are two options: if the driver implements struct
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* v4l2_device, then the lock defined there is used to
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* serialize the ioctls. Otherwise the v4l2 core lock defined
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* below is used. This lock is really bad since it serializes
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* completely independent devices.
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*
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* Both variants suffer from the same problem: if the driver
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* sleeps, then it blocks all ioctls since the lock is still
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* held. This is very common for VIDIOC_DQBUF since that
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* normally waits for a frame to arrive. As a result any other
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* ioctl calls will proceed very, very slowly since each call
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* will have to wait for the VIDIOC_QBUF to finish. Things that
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* should take 0.01s may now take 10-20 seconds.
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*
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* The workaround is to *not* take the lock for VIDIOC_DQBUF.
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* This actually works OK for videobuf-based drivers, since
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* videobuf will take its own internal lock.
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*/
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static DEFINE_MUTEX(v4l2_ioctl_mutex);
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struct mutex *m = vdev->v4l2_dev ?
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&vdev->v4l2_dev->ioctl_lock : &v4l2_ioctl_mutex;
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if (cmd != VIDIOC_DQBUF && mutex_lock_interruptible(m))
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return -ERESTARTSYS;
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if (video_is_registered(vdev))
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ret = vdev->fops->ioctl(filp, cmd, arg);
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if (cmd != VIDIOC_DQBUF)
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mutex_unlock(m);
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} else
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ret = -ENOTTY;
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return ret;
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}
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#ifdef CONFIG_MMU
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#define v4l2_get_unmapped_area NULL
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#else
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static unsigned long v4l2_get_unmapped_area(struct file *filp,
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unsigned long addr, unsigned long len, unsigned long pgoff,
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unsigned long flags)
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{
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struct video_device *vdev = video_devdata(filp);
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if (!vdev->fops->get_unmapped_area)
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return -ENOSYS;
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if (!video_is_registered(vdev))
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return -ENODEV;
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return vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags);
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}
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#endif
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static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm)
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{
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struct video_device *vdev = video_devdata(filp);
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int ret = -ENODEV;
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if (!vdev->fops->mmap)
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return ret;
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if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) &&
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mutex_lock_interruptible(vdev->lock))
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return -ERESTARTSYS;
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if (video_is_registered(vdev))
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ret = vdev->fops->mmap(filp, vm);
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if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
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mutex_unlock(vdev->lock);
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return ret;
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}
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/* Override for the open function */
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static int v4l2_open(struct inode *inode, struct file *filp)
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{
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struct video_device *vdev;
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int ret = 0;
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/* Check if the video device is available */
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mutex_lock(&videodev_lock);
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vdev = video_devdata(filp);
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/* return ENODEV if the video device has already been removed. */
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if (vdev == NULL || !video_is_registered(vdev)) {
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mutex_unlock(&videodev_lock);
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return -ENODEV;
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}
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/* and increase the device refcount */
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video_get(vdev);
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mutex_unlock(&videodev_lock);
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if (vdev->fops->open) {
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if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags) &&
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mutex_lock_interruptible(vdev->lock)) {
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ret = -ERESTARTSYS;
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goto err;
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}
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if (video_is_registered(vdev))
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ret = vdev->fops->open(filp);
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else
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ret = -ENODEV;
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if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
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mutex_unlock(vdev->lock);
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}
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err:
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/* decrease the refcount in case of an error */
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if (ret)
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video_put(vdev);
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return ret;
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}
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/* Override for the release function */
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static int v4l2_release(struct inode *inode, struct file *filp)
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{
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struct video_device *vdev = video_devdata(filp);
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int ret = 0;
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if (vdev->fops->release) {
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if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
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mutex_lock(vdev->lock);
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vdev->fops->release(filp);
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if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
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mutex_unlock(vdev->lock);
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}
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/* decrease the refcount unconditionally since the release()
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return value is ignored. */
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video_put(vdev);
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return ret;
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}
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static const struct file_operations v4l2_fops = {
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.owner = THIS_MODULE,
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.read = v4l2_read,
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.write = v4l2_write,
|
|
.open = v4l2_open,
|
|
.get_unmapped_area = v4l2_get_unmapped_area,
|
|
.mmap = v4l2_mmap,
|
|
.unlocked_ioctl = v4l2_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = v4l2_compat_ioctl32,
|
|
#endif
|
|
.release = v4l2_release,
|
|
.poll = v4l2_poll,
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
/**
|
|
* get_index - assign stream index number based on parent device
|
|
* @vdev: video_device to assign index number to, vdev->parent should be assigned
|
|
*
|
|
* Note that when this is called the new device has not yet been registered
|
|
* in the video_device array, but it was able to obtain a minor number.
|
|
*
|
|
* This means that we can always obtain a free stream index number since
|
|
* the worst case scenario is that there are VIDEO_NUM_DEVICES - 1 slots in
|
|
* use of the video_device array.
|
|
*
|
|
* Returns a free index number.
|
|
*/
|
|
static int get_index(struct video_device *vdev)
|
|
{
|
|
/* This can be static since this function is called with the global
|
|
videodev_lock held. */
|
|
static DECLARE_BITMAP(used, VIDEO_NUM_DEVICES);
|
|
int i;
|
|
|
|
/* Some drivers do not set the parent. In that case always return 0. */
|
|
if (vdev->parent == NULL)
|
|
return 0;
|
|
|
|
bitmap_zero(used, VIDEO_NUM_DEVICES);
|
|
|
|
for (i = 0; i < VIDEO_NUM_DEVICES; i++) {
|
|
if (video_device[i] != NULL &&
|
|
video_device[i]->parent == vdev->parent) {
|
|
set_bit(video_device[i]->index, used);
|
|
}
|
|
}
|
|
|
|
return find_first_zero_bit(used, VIDEO_NUM_DEVICES);
|
|
}
|
|
|
|
#define SET_VALID_IOCTL(ops, cmd, op) \
|
|
if (ops->op) \
|
|
set_bit(_IOC_NR(cmd), valid_ioctls)
|
|
|
|
/* This determines which ioctls are actually implemented in the driver.
|
|
It's a one-time thing which simplifies video_ioctl2 as it can just do
|
|
a bit test.
|
|
|
|
Note that drivers can override this by setting bits to 1 in
|
|
vdev->valid_ioctls. If an ioctl is marked as 1 when this function is
|
|
called, then that ioctl will actually be marked as unimplemented.
|
|
|
|
It does that by first setting up the local valid_ioctls bitmap, and
|
|
at the end do a:
|
|
|
|
vdev->valid_ioctls = valid_ioctls & ~(vdev->valid_ioctls)
|
|
*/
|
|
static void determine_valid_ioctls(struct video_device *vdev)
|
|
{
|
|
DECLARE_BITMAP(valid_ioctls, BASE_VIDIOC_PRIVATE);
|
|
const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops;
|
|
|
|
bitmap_zero(valid_ioctls, BASE_VIDIOC_PRIVATE);
|
|
|
|
SET_VALID_IOCTL(ops, VIDIOC_QUERYCAP, vidioc_querycap);
|
|
if (ops->vidioc_g_priority ||
|
|
test_bit(V4L2_FL_USE_FH_PRIO, &vdev->flags))
|
|
set_bit(_IOC_NR(VIDIOC_G_PRIORITY), valid_ioctls);
|
|
if (ops->vidioc_s_priority ||
|
|
test_bit(V4L2_FL_USE_FH_PRIO, &vdev->flags))
|
|
set_bit(_IOC_NR(VIDIOC_S_PRIORITY), valid_ioctls);
|
|
if (ops->vidioc_enum_fmt_vid_cap ||
|
|
ops->vidioc_enum_fmt_vid_out ||
|
|
ops->vidioc_enum_fmt_vid_cap_mplane ||
|
|
ops->vidioc_enum_fmt_vid_out_mplane ||
|
|
ops->vidioc_enum_fmt_vid_overlay ||
|
|
ops->vidioc_enum_fmt_type_private)
|
|
set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls);
|
|
if (ops->vidioc_g_fmt_vid_cap ||
|
|
ops->vidioc_g_fmt_vid_out ||
|
|
ops->vidioc_g_fmt_vid_cap_mplane ||
|
|
ops->vidioc_g_fmt_vid_out_mplane ||
|
|
ops->vidioc_g_fmt_vid_overlay ||
|
|
ops->vidioc_g_fmt_vbi_cap ||
|
|
ops->vidioc_g_fmt_vid_out_overlay ||
|
|
ops->vidioc_g_fmt_vbi_out ||
|
|
ops->vidioc_g_fmt_sliced_vbi_cap ||
|
|
ops->vidioc_g_fmt_sliced_vbi_out ||
|
|
ops->vidioc_g_fmt_type_private)
|
|
set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls);
|
|
if (ops->vidioc_s_fmt_vid_cap ||
|
|
ops->vidioc_s_fmt_vid_out ||
|
|
ops->vidioc_s_fmt_vid_cap_mplane ||
|
|
ops->vidioc_s_fmt_vid_out_mplane ||
|
|
ops->vidioc_s_fmt_vid_overlay ||
|
|
ops->vidioc_s_fmt_vbi_cap ||
|
|
ops->vidioc_s_fmt_vid_out_overlay ||
|
|
ops->vidioc_s_fmt_vbi_out ||
|
|
ops->vidioc_s_fmt_sliced_vbi_cap ||
|
|
ops->vidioc_s_fmt_sliced_vbi_out ||
|
|
ops->vidioc_s_fmt_type_private)
|
|
set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls);
|
|
if (ops->vidioc_try_fmt_vid_cap ||
|
|
ops->vidioc_try_fmt_vid_out ||
|
|
ops->vidioc_try_fmt_vid_cap_mplane ||
|
|
ops->vidioc_try_fmt_vid_out_mplane ||
|
|
ops->vidioc_try_fmt_vid_overlay ||
|
|
ops->vidioc_try_fmt_vbi_cap ||
|
|
ops->vidioc_try_fmt_vid_out_overlay ||
|
|
ops->vidioc_try_fmt_vbi_out ||
|
|
ops->vidioc_try_fmt_sliced_vbi_cap ||
|
|
ops->vidioc_try_fmt_sliced_vbi_out ||
|
|
ops->vidioc_try_fmt_type_private)
|
|
set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls);
|
|
SET_VALID_IOCTL(ops, VIDIOC_REQBUFS, vidioc_reqbufs);
|
|
SET_VALID_IOCTL(ops, VIDIOC_QUERYBUF, vidioc_querybuf);
|
|
SET_VALID_IOCTL(ops, VIDIOC_QBUF, vidioc_qbuf);
|
|
SET_VALID_IOCTL(ops, VIDIOC_DQBUF, vidioc_dqbuf);
|
|
SET_VALID_IOCTL(ops, VIDIOC_OVERLAY, vidioc_overlay);
|
|
SET_VALID_IOCTL(ops, VIDIOC_G_FBUF, vidioc_g_fbuf);
|
|
SET_VALID_IOCTL(ops, VIDIOC_S_FBUF, vidioc_s_fbuf);
|
|
SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon);
|
|
SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff);
|
|
if (vdev->tvnorms)
|
|
set_bit(_IOC_NR(VIDIOC_ENUMSTD), valid_ioctls);
|
|
if (ops->vidioc_g_std || vdev->current_norm)
|
|
set_bit(_IOC_NR(VIDIOC_G_STD), valid_ioctls);
|
|
SET_VALID_IOCTL(ops, VIDIOC_S_STD, vidioc_s_std);
|
|
SET_VALID_IOCTL(ops, VIDIOC_QUERYSTD, vidioc_querystd);
|
|
SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input);
|
|
SET_VALID_IOCTL(ops, VIDIOC_G_INPUT, vidioc_g_input);
|
|
SET_VALID_IOCTL(ops, VIDIOC_S_INPUT, vidioc_s_input);
|
|
SET_VALID_IOCTL(ops, VIDIOC_ENUMOUTPUT, vidioc_enum_output);
|
|
SET_VALID_IOCTL(ops, VIDIOC_G_OUTPUT, vidioc_g_output);
|
|
SET_VALID_IOCTL(ops, VIDIOC_S_OUTPUT, vidioc_s_output);
|
|
/* Note: the control handler can also be passed through the filehandle,
|
|
and that can't be tested here. If the bit for these control ioctls
|
|
is set, then the ioctl is valid. But if it is 0, then it can still
|
|
be valid if the filehandle passed the control handler. */
|
|
if (vdev->ctrl_handler || ops->vidioc_queryctrl)
|
|
set_bit(_IOC_NR(VIDIOC_QUERYCTRL), valid_ioctls);
|
|
if (vdev->ctrl_handler || ops->vidioc_g_ctrl || ops->vidioc_g_ext_ctrls)
|
|
set_bit(_IOC_NR(VIDIOC_G_CTRL), valid_ioctls);
|
|
if (vdev->ctrl_handler || ops->vidioc_s_ctrl || ops->vidioc_s_ext_ctrls)
|
|
set_bit(_IOC_NR(VIDIOC_S_CTRL), valid_ioctls);
|
|
if (vdev->ctrl_handler || ops->vidioc_g_ext_ctrls)
|
|
set_bit(_IOC_NR(VIDIOC_G_EXT_CTRLS), valid_ioctls);
|
|
if (vdev->ctrl_handler || ops->vidioc_s_ext_ctrls)
|
|
set_bit(_IOC_NR(VIDIOC_S_EXT_CTRLS), valid_ioctls);
|
|
if (vdev->ctrl_handler || ops->vidioc_try_ext_ctrls)
|
|
set_bit(_IOC_NR(VIDIOC_TRY_EXT_CTRLS), valid_ioctls);
|
|
if (vdev->ctrl_handler || ops->vidioc_querymenu)
|
|
set_bit(_IOC_NR(VIDIOC_QUERYMENU), valid_ioctls);
|
|
SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDIO, vidioc_enumaudio);
|
|
SET_VALID_IOCTL(ops, VIDIOC_G_AUDIO, vidioc_g_audio);
|
|
SET_VALID_IOCTL(ops, VIDIOC_S_AUDIO, vidioc_s_audio);
|
|
SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDOUT, vidioc_enumaudout);
|
|
SET_VALID_IOCTL(ops, VIDIOC_G_AUDOUT, vidioc_g_audout);
|
|
SET_VALID_IOCTL(ops, VIDIOC_S_AUDOUT, vidioc_s_audout);
|
|
SET_VALID_IOCTL(ops, VIDIOC_G_MODULATOR, vidioc_g_modulator);
|
|
SET_VALID_IOCTL(ops, VIDIOC_S_MODULATOR, vidioc_s_modulator);
|
|
if (ops->vidioc_g_crop || ops->vidioc_g_selection)
|
|
set_bit(_IOC_NR(VIDIOC_G_CROP), valid_ioctls);
|
|
if (ops->vidioc_s_crop || ops->vidioc_s_selection)
|
|
set_bit(_IOC_NR(VIDIOC_S_CROP), valid_ioctls);
|
|
SET_VALID_IOCTL(ops, VIDIOC_G_SELECTION, vidioc_g_selection);
|
|
SET_VALID_IOCTL(ops, VIDIOC_S_SELECTION, vidioc_s_selection);
|
|
if (ops->vidioc_cropcap || ops->vidioc_g_selection)
|
|
set_bit(_IOC_NR(VIDIOC_CROPCAP), valid_ioctls);
|
|
SET_VALID_IOCTL(ops, VIDIOC_G_JPEGCOMP, vidioc_g_jpegcomp);
|
|
SET_VALID_IOCTL(ops, VIDIOC_S_JPEGCOMP, vidioc_s_jpegcomp);
|
|
SET_VALID_IOCTL(ops, VIDIOC_G_ENC_INDEX, vidioc_g_enc_index);
|
|
SET_VALID_IOCTL(ops, VIDIOC_ENCODER_CMD, vidioc_encoder_cmd);
|
|
SET_VALID_IOCTL(ops, VIDIOC_TRY_ENCODER_CMD, vidioc_try_encoder_cmd);
|
|
SET_VALID_IOCTL(ops, VIDIOC_DECODER_CMD, vidioc_decoder_cmd);
|
|
SET_VALID_IOCTL(ops, VIDIOC_TRY_DECODER_CMD, vidioc_try_decoder_cmd);
|
|
if (ops->vidioc_g_parm || vdev->current_norm)
|
|
set_bit(_IOC_NR(VIDIOC_G_PARM), valid_ioctls);
|
|
SET_VALID_IOCTL(ops, VIDIOC_S_PARM, vidioc_s_parm);
|
|
SET_VALID_IOCTL(ops, VIDIOC_G_TUNER, vidioc_g_tuner);
|
|
SET_VALID_IOCTL(ops, VIDIOC_S_TUNER, vidioc_s_tuner);
|
|
SET_VALID_IOCTL(ops, VIDIOC_G_FREQUENCY, vidioc_g_frequency);
|
|
SET_VALID_IOCTL(ops, VIDIOC_S_FREQUENCY, vidioc_s_frequency);
|
|
SET_VALID_IOCTL(ops, VIDIOC_G_SLICED_VBI_CAP, vidioc_g_sliced_vbi_cap);
|
|
SET_VALID_IOCTL(ops, VIDIOC_LOG_STATUS, vidioc_log_status);
|
|
#ifdef CONFIG_VIDEO_ADV_DEBUG
|
|
SET_VALID_IOCTL(ops, VIDIOC_DBG_G_REGISTER, vidioc_g_register);
|
|
SET_VALID_IOCTL(ops, VIDIOC_DBG_S_REGISTER, vidioc_s_register);
|
|
#endif
|
|
SET_VALID_IOCTL(ops, VIDIOC_DBG_G_CHIP_IDENT, vidioc_g_chip_ident);
|
|
SET_VALID_IOCTL(ops, VIDIOC_S_HW_FREQ_SEEK, vidioc_s_hw_freq_seek);
|
|
SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes);
|
|
SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals);
|
|
SET_VALID_IOCTL(ops, VIDIOC_ENUM_DV_PRESETS, vidioc_enum_dv_presets);
|
|
SET_VALID_IOCTL(ops, VIDIOC_S_DV_PRESET, vidioc_s_dv_preset);
|
|
SET_VALID_IOCTL(ops, VIDIOC_G_DV_PRESET, vidioc_g_dv_preset);
|
|
SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_PRESET, vidioc_query_dv_preset);
|
|
SET_VALID_IOCTL(ops, VIDIOC_S_DV_TIMINGS, vidioc_s_dv_timings);
|
|
SET_VALID_IOCTL(ops, VIDIOC_G_DV_TIMINGS, vidioc_g_dv_timings);
|
|
/* yes, really vidioc_subscribe_event */
|
|
SET_VALID_IOCTL(ops, VIDIOC_DQEVENT, vidioc_subscribe_event);
|
|
SET_VALID_IOCTL(ops, VIDIOC_SUBSCRIBE_EVENT, vidioc_subscribe_event);
|
|
SET_VALID_IOCTL(ops, VIDIOC_UNSUBSCRIBE_EVENT, vidioc_unsubscribe_event);
|
|
SET_VALID_IOCTL(ops, VIDIOC_CREATE_BUFS, vidioc_create_bufs);
|
|
SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, vidioc_prepare_buf);
|
|
bitmap_andnot(vdev->valid_ioctls, valid_ioctls, vdev->valid_ioctls,
|
|
BASE_VIDIOC_PRIVATE);
|
|
}
|
|
|
|
/**
|
|
* __video_register_device - register video4linux devices
|
|
* @vdev: video device structure we want to register
|
|
* @type: type of device to register
|
|
* @nr: which device node number (0 == /dev/video0, 1 == /dev/video1, ...
|
|
* -1 == first free)
|
|
* @warn_if_nr_in_use: warn if the desired device node number
|
|
* was already in use and another number was chosen instead.
|
|
* @owner: module that owns the video device node
|
|
*
|
|
* The registration code assigns minor numbers and device node numbers
|
|
* based on the requested type and registers the new device node with
|
|
* the kernel.
|
|
*
|
|
* This function assumes that struct video_device was zeroed when it
|
|
* was allocated and does not contain any stale date.
|
|
*
|
|
* An error is returned if no free minor or device node number could be
|
|
* found, or if the registration of the device node failed.
|
|
*
|
|
* Zero is returned on success.
|
|
*
|
|
* Valid types are
|
|
*
|
|
* %VFL_TYPE_GRABBER - A frame grabber
|
|
*
|
|
* %VFL_TYPE_VBI - Vertical blank data (undecoded)
|
|
*
|
|
* %VFL_TYPE_RADIO - A radio card
|
|
*
|
|
* %VFL_TYPE_SUBDEV - A subdevice
|
|
*/
|
|
int __video_register_device(struct video_device *vdev, int type, int nr,
|
|
int warn_if_nr_in_use, struct module *owner)
|
|
{
|
|
int i = 0;
|
|
int ret;
|
|
int minor_offset = 0;
|
|
int minor_cnt = VIDEO_NUM_DEVICES;
|
|
const char *name_base;
|
|
|
|
/* A minor value of -1 marks this video device as never
|
|
having been registered */
|
|
vdev->minor = -1;
|
|
|
|
/* the release callback MUST be present */
|
|
if (WARN_ON(!vdev->release))
|
|
return -EINVAL;
|
|
|
|
/* v4l2_fh support */
|
|
spin_lock_init(&vdev->fh_lock);
|
|
INIT_LIST_HEAD(&vdev->fh_list);
|
|
|
|
/* Part 1: check device type */
|
|
switch (type) {
|
|
case VFL_TYPE_GRABBER:
|
|
name_base = "video";
|
|
break;
|
|
case VFL_TYPE_VBI:
|
|
name_base = "vbi";
|
|
break;
|
|
case VFL_TYPE_RADIO:
|
|
name_base = "radio";
|
|
break;
|
|
case VFL_TYPE_SUBDEV:
|
|
name_base = "v4l-subdev";
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "%s called with unknown type: %d\n",
|
|
__func__, type);
|
|
return -EINVAL;
|
|
}
|
|
|
|
vdev->vfl_type = type;
|
|
vdev->cdev = NULL;
|
|
if (vdev->v4l2_dev) {
|
|
if (vdev->v4l2_dev->dev)
|
|
vdev->parent = vdev->v4l2_dev->dev;
|
|
if (vdev->ctrl_handler == NULL)
|
|
vdev->ctrl_handler = vdev->v4l2_dev->ctrl_handler;
|
|
/* If the prio state pointer is NULL, then use the v4l2_device
|
|
prio state. */
|
|
if (vdev->prio == NULL)
|
|
vdev->prio = &vdev->v4l2_dev->prio;
|
|
}
|
|
|
|
/* Part 2: find a free minor, device node number and device index. */
|
|
#ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES
|
|
/* Keep the ranges for the first four types for historical
|
|
* reasons.
|
|
* Newer devices (not yet in place) should use the range
|
|
* of 128-191 and just pick the first free minor there
|
|
* (new style). */
|
|
switch (type) {
|
|
case VFL_TYPE_GRABBER:
|
|
minor_offset = 0;
|
|
minor_cnt = 64;
|
|
break;
|
|
case VFL_TYPE_RADIO:
|
|
minor_offset = 64;
|
|
minor_cnt = 64;
|
|
break;
|
|
case VFL_TYPE_VBI:
|
|
minor_offset = 224;
|
|
minor_cnt = 32;
|
|
break;
|
|
default:
|
|
minor_offset = 128;
|
|
minor_cnt = 64;
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
/* Pick a device node number */
|
|
mutex_lock(&videodev_lock);
|
|
nr = devnode_find(vdev, nr == -1 ? 0 : nr, minor_cnt);
|
|
if (nr == minor_cnt)
|
|
nr = devnode_find(vdev, 0, minor_cnt);
|
|
if (nr == minor_cnt) {
|
|
printk(KERN_ERR "could not get a free device node number\n");
|
|
mutex_unlock(&videodev_lock);
|
|
return -ENFILE;
|
|
}
|
|
#ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES
|
|
/* 1-on-1 mapping of device node number to minor number */
|
|
i = nr;
|
|
#else
|
|
/* The device node number and minor numbers are independent, so
|
|
we just find the first free minor number. */
|
|
for (i = 0; i < VIDEO_NUM_DEVICES; i++)
|
|
if (video_device[i] == NULL)
|
|
break;
|
|
if (i == VIDEO_NUM_DEVICES) {
|
|
mutex_unlock(&videodev_lock);
|
|
printk(KERN_ERR "could not get a free minor\n");
|
|
return -ENFILE;
|
|
}
|
|
#endif
|
|
vdev->minor = i + minor_offset;
|
|
vdev->num = nr;
|
|
devnode_set(vdev);
|
|
|
|
/* Should not happen since we thought this minor was free */
|
|
WARN_ON(video_device[vdev->minor] != NULL);
|
|
vdev->index = get_index(vdev);
|
|
mutex_unlock(&videodev_lock);
|
|
/* if no lock was passed, then make sure the LOCK_ALL_FOPS bit is
|
|
clear and warn if it wasn't. */
|
|
if (vdev->lock == NULL)
|
|
WARN_ON(test_and_clear_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags));
|
|
|
|
if (vdev->ioctl_ops)
|
|
determine_valid_ioctls(vdev);
|
|
|
|
/* Part 3: Initialize the character device */
|
|
vdev->cdev = cdev_alloc();
|
|
if (vdev->cdev == NULL) {
|
|
ret = -ENOMEM;
|
|
goto cleanup;
|
|
}
|
|
vdev->cdev->ops = &v4l2_fops;
|
|
vdev->cdev->owner = owner;
|
|
ret = cdev_add(vdev->cdev, MKDEV(VIDEO_MAJOR, vdev->minor), 1);
|
|
if (ret < 0) {
|
|
printk(KERN_ERR "%s: cdev_add failed\n", __func__);
|
|
kfree(vdev->cdev);
|
|
vdev->cdev = NULL;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Part 4: register the device with sysfs */
|
|
vdev->dev.class = &video_class;
|
|
vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor);
|
|
if (vdev->parent)
|
|
vdev->dev.parent = vdev->parent;
|
|
dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num);
|
|
ret = device_register(&vdev->dev);
|
|
if (ret < 0) {
|
|
printk(KERN_ERR "%s: device_register failed\n", __func__);
|
|
goto cleanup;
|
|
}
|
|
/* Register the release callback that will be called when the last
|
|
reference to the device goes away. */
|
|
vdev->dev.release = v4l2_device_release;
|
|
|
|
if (nr != -1 && nr != vdev->num && warn_if_nr_in_use)
|
|
printk(KERN_WARNING "%s: requested %s%d, got %s\n", __func__,
|
|
name_base, nr, video_device_node_name(vdev));
|
|
|
|
/* Increase v4l2_device refcount */
|
|
if (vdev->v4l2_dev)
|
|
v4l2_device_get(vdev->v4l2_dev);
|
|
|
|
#if defined(CONFIG_MEDIA_CONTROLLER)
|
|
/* Part 5: Register the entity. */
|
|
if (vdev->v4l2_dev && vdev->v4l2_dev->mdev &&
|
|
vdev->vfl_type != VFL_TYPE_SUBDEV) {
|
|
vdev->entity.type = MEDIA_ENT_T_DEVNODE_V4L;
|
|
vdev->entity.name = vdev->name;
|
|
vdev->entity.info.v4l.major = VIDEO_MAJOR;
|
|
vdev->entity.info.v4l.minor = vdev->minor;
|
|
ret = media_device_register_entity(vdev->v4l2_dev->mdev,
|
|
&vdev->entity);
|
|
if (ret < 0)
|
|
printk(KERN_WARNING
|
|
"%s: media_device_register_entity failed\n",
|
|
__func__);
|
|
}
|
|
#endif
|
|
/* Part 6: Activate this minor. The char device can now be used. */
|
|
set_bit(V4L2_FL_REGISTERED, &vdev->flags);
|
|
mutex_lock(&videodev_lock);
|
|
video_device[vdev->minor] = vdev;
|
|
mutex_unlock(&videodev_lock);
|
|
|
|
return 0;
|
|
|
|
cleanup:
|
|
mutex_lock(&videodev_lock);
|
|
if (vdev->cdev)
|
|
cdev_del(vdev->cdev);
|
|
devnode_clear(vdev);
|
|
mutex_unlock(&videodev_lock);
|
|
/* Mark this video device as never having been registered. */
|
|
vdev->minor = -1;
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(__video_register_device);
|
|
|
|
/**
|
|
* video_unregister_device - unregister a video4linux device
|
|
* @vdev: the device to unregister
|
|
*
|
|
* This unregisters the passed device. Future open calls will
|
|
* be met with errors.
|
|
*/
|
|
void video_unregister_device(struct video_device *vdev)
|
|
{
|
|
/* Check if vdev was ever registered at all */
|
|
if (!vdev || !video_is_registered(vdev))
|
|
return;
|
|
|
|
mutex_lock(&videodev_lock);
|
|
/* This must be in a critical section to prevent a race with v4l2_open.
|
|
* Once this bit has been cleared video_get may never be called again.
|
|
*/
|
|
clear_bit(V4L2_FL_REGISTERED, &vdev->flags);
|
|
mutex_unlock(&videodev_lock);
|
|
device_unregister(&vdev->dev);
|
|
}
|
|
EXPORT_SYMBOL(video_unregister_device);
|
|
|
|
/*
|
|
* Initialise video for linux
|
|
*/
|
|
static int __init videodev_init(void)
|
|
{
|
|
dev_t dev = MKDEV(VIDEO_MAJOR, 0);
|
|
int ret;
|
|
|
|
printk(KERN_INFO "Linux video capture interface: v2.00\n");
|
|
ret = register_chrdev_region(dev, VIDEO_NUM_DEVICES, VIDEO_NAME);
|
|
if (ret < 0) {
|
|
printk(KERN_WARNING "videodev: unable to get major %d\n",
|
|
VIDEO_MAJOR);
|
|
return ret;
|
|
}
|
|
|
|
ret = class_register(&video_class);
|
|
if (ret < 0) {
|
|
unregister_chrdev_region(dev, VIDEO_NUM_DEVICES);
|
|
printk(KERN_WARNING "video_dev: class_register failed\n");
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit videodev_exit(void)
|
|
{
|
|
dev_t dev = MKDEV(VIDEO_MAJOR, 0);
|
|
|
|
class_unregister(&video_class);
|
|
unregister_chrdev_region(dev, VIDEO_NUM_DEVICES);
|
|
}
|
|
|
|
subsys_initcall(videodev_init);
|
|
module_exit(videodev_exit)
|
|
|
|
MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@infradead.org>");
|
|
MODULE_DESCRIPTION("Device registrar for Video4Linux drivers v2");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_CHARDEV_MAJOR(VIDEO_MAJOR);
|
|
|
|
|
|
/*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|