2008-07-20 07:43:17 -04:00
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/*
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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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2008-10-27 14:13:47 -04:00
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* Authors: Alan Cox, <alan@lxorguk.ukuu.org.uk> (version 1)
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2008-07-20 07:43:17 -04:00
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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 <asm/system.h>
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#include <media/v4l2-common.h>
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2008-12-23 05:35:17 -05:00
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#include <media/v4l2-device.h>
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2008-12-30 04:58:20 -05:00
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#include <media/v4l2-ioctl.h>
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2008-07-20 07:43:17 -04:00
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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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2008-12-19 19:28:27 -05:00
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struct video_device *vdev = to_video_device(cd);
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2008-08-23 06:48:38 -04:00
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2008-12-19 19:28:27 -05:00
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return sprintf(buf, "%i\n", vdev->index);
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2008-07-20 07:43:17 -04:00
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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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2008-12-19 19:28:27 -05:00
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struct video_device *vdev = to_video_device(cd);
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2008-08-23 06:48:38 -04:00
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2008-12-19 19:28:27 -05:00
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return sprintf(buf, "%.*s\n", (int)sizeof(vdev->name), vdev->name);
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2008-07-20 07:43:17 -04:00
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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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2008-08-29 16:31:35 -04:00
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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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2009-09-06 06:13:14 -04:00
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static DECLARE_BITMAP(devnode_nums[VFL_TYPE_MAX], VIDEO_NUM_DEVICES);
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2008-08-29 16:31:35 -04:00
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2009-09-07 02:40:24 -04:00
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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_VTX) ? 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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2008-07-20 07:43:17 -04:00
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struct video_device *video_device_alloc(void)
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{
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2008-08-23 06:48:38 -04:00
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return kzalloc(sizeof(struct video_device), GFP_KERNEL);
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2008-07-20 07:43:17 -04:00
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}
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EXPORT_SYMBOL(video_device_alloc);
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2008-12-19 19:28:27 -05:00
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void video_device_release(struct video_device *vdev)
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2008-07-20 07:43:17 -04:00
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{
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2008-12-19 19:28:27 -05:00
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kfree(vdev);
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2008-07-20 07:43:17 -04:00
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}
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EXPORT_SYMBOL(video_device_release);
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2008-12-19 19:28:27 -05:00
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void video_device_release_empty(struct video_device *vdev)
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2008-08-23 04:47:41 -04:00
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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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2008-12-19 19:28:27 -05:00
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static inline void video_get(struct video_device *vdev)
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2008-08-29 16:31:35 -04:00
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{
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2008-12-19 19:28:27 -05:00
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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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2008-08-29 16:31:35 -04:00
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mutex_lock(&videodev_lock);
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2008-12-19 19:28:27 -05:00
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if (video_device[vdev->minor] != vdev) {
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2008-08-30 08:40:47 -04:00
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mutex_unlock(&videodev_lock);
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2008-12-19 19:28:27 -05:00
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/* should not happen */
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WARN_ON(1);
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2008-08-30 08:40:47 -04:00
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return;
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}
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2008-08-29 16:31:35 -04:00
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/* Free up this device for reuse */
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2008-12-19 19:28:27 -05:00
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video_device[vdev->minor] = NULL;
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2008-08-29 16:31:35 -04:00
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2008-12-19 19:28:27 -05:00
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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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2008-08-29 16:31:35 -04:00
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2009-09-06 06:13:14 -04:00
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/* Mark device node number as free */
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2009-09-07 02:40:24 -04:00
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devnode_clear(vdev);
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2008-08-29 16:31:35 -04:00
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2008-12-19 19:28:27 -05:00
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mutex_unlock(&videodev_lock);
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2008-07-20 07:43:17 -04:00
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2008-12-19 19:28:27 -05:00
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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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2008-07-20 07:43:17 -04:00
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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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2008-12-19 19:28:27 -05:00
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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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if (!vdev->fops->read)
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return -EINVAL;
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if (video_is_unregistered(vdev))
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return -EIO;
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return vdev->fops->read(filp, buf, sz, off);
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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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if (!vdev->fops->write)
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return -EINVAL;
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if (video_is_unregistered(vdev))
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return -EIO;
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return vdev->fops->write(filp, buf, sz, off);
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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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if (!vdev->fops->poll || video_is_unregistered(vdev))
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return DEFAULT_POLLMASK;
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return vdev->fops->poll(filp, poll);
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}
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static int v4l2_ioctl(struct inode *inode, struct file *filp,
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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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if (!vdev->fops->ioctl)
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return -ENOTTY;
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/* Allow ioctl to continue even if the device was unregistered.
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Things like dequeueing buffers might still be useful. */
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2008-12-30 04:58:20 -05:00
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return vdev->fops->ioctl(filp, cmd, arg);
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2008-12-19 19:28:27 -05:00
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}
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static long v4l2_unlocked_ioctl(struct file *filp,
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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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if (!vdev->fops->unlocked_ioctl)
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return -ENOTTY;
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/* Allow ioctl to continue even if the device was unregistered.
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Things like dequeueing buffers might still be useful. */
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return vdev->fops->unlocked_ioctl(filp, cmd, arg);
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}
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2009-03-26 10:31:08 -04:00
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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_unregistered(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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2008-12-19 19:28:27 -05:00
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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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if (!vdev->fops->mmap ||
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video_is_unregistered(vdev))
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return -ENODEV;
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return vdev->fops->mmap(filp, vm);
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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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2009-03-29 19:19:38 -04:00
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int ret = 0;
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2008-12-19 19:28:27 -05:00
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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 been removed
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already or if it is not registered anymore. */
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if (vdev == NULL || video_is_unregistered(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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2009-03-29 19:19:38 -04:00
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if (vdev->fops->open)
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ret = vdev->fops->open(filp);
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2008-12-19 19:28:27 -05:00
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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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2009-03-29 19:19:38 -04:00
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int ret = 0;
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if (vdev->fops->release)
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vdev->fops->release(filp);
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2008-12-19 19:28:27 -05:00
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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_unlocked_fops = {
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.owner = THIS_MODULE,
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.read = v4l2_read,
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.write = v4l2_write,
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.open = v4l2_open,
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2009-03-26 10:31:08 -04:00
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.get_unmapped_area = v4l2_get_unmapped_area,
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2008-12-19 19:28:27 -05:00
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.mmap = v4l2_mmap,
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.unlocked_ioctl = v4l2_unlocked_ioctl,
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#ifdef CONFIG_COMPAT
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2008-12-30 04:42:40 -05:00
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.compat_ioctl = v4l2_compat_ioctl32,
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2008-12-19 19:28:27 -05:00
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#endif
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.release = v4l2_release,
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.poll = v4l2_poll,
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.llseek = no_llseek,
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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,
|
2009-03-26 10:31:08 -04:00
|
|
|
.get_unmapped_area = v4l2_get_unmapped_area,
|
2008-12-19 19:28:27 -05:00
|
|
|
.mmap = v4l2_mmap,
|
|
|
|
.ioctl = v4l2_ioctl,
|
|
|
|
#ifdef CONFIG_COMPAT
|
2008-12-30 04:42:40 -05:00
|
|
|
.compat_ioctl = v4l2_compat_ioctl32,
|
2008-12-19 19:28:27 -05:00
|
|
|
#endif
|
|
|
|
.release = v4l2_release,
|
|
|
|
.poll = v4l2_poll,
|
|
|
|
.llseek = no_llseek,
|
|
|
|
};
|
|
|
|
|
2008-07-20 07:43:17 -04:00
|
|
|
/**
|
2009-06-19 10:32:56 -04:00
|
|
|
* get_index - assign stream index number based on parent device
|
2008-12-19 19:28:27 -05:00
|
|
|
* @vdev: video_device to assign index number to, vdev->parent should be assigned
|
2008-07-20 07:43:17 -04:00
|
|
|
*
|
2008-12-19 19:28:27 -05:00
|
|
|
* Note that when this is called the new device has not yet been registered
|
2009-06-19 10:32:56 -04:00
|
|
|
* in the video_device array, but it was able to obtain a minor number.
|
2008-07-20 07:43:17 -04:00
|
|
|
*
|
2009-06-19 10:32:56 -04:00
|
|
|
* 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.
|
2008-07-20 07:43:17 -04:00
|
|
|
*/
|
2009-06-19 10:32:56 -04:00
|
|
|
static int get_index(struct video_device *vdev)
|
2008-07-20 07:43:17 -04:00
|
|
|
{
|
2009-02-14 09:31:01 -05:00
|
|
|
/* This can be static since this function is called with the global
|
|
|
|
videodev_lock held. */
|
|
|
|
static DECLARE_BITMAP(used, VIDEO_NUM_DEVICES);
|
2008-07-20 07:43:17 -04:00
|
|
|
int i;
|
|
|
|
|
2009-06-19 10:32:56 -04:00
|
|
|
/* Some drivers do not set the parent. In that case always return 0. */
|
2008-12-19 07:10:56 -05:00
|
|
|
if (vdev->parent == NULL)
|
2009-06-19 10:32:56 -04:00
|
|
|
return 0;
|
2009-02-14 09:31:01 -05:00
|
|
|
|
|
|
|
bitmap_zero(used, VIDEO_NUM_DEVICES);
|
2008-12-19 07:10:56 -05:00
|
|
|
|
2008-07-20 07:43:17 -04:00
|
|
|
for (i = 0; i < VIDEO_NUM_DEVICES; i++) {
|
|
|
|
if (video_device[i] != NULL &&
|
2008-07-20 05:31:39 -04:00
|
|
|
video_device[i]->parent == vdev->parent) {
|
2009-02-14 09:31:01 -05:00
|
|
|
set_bit(video_device[i]->index, used);
|
2008-07-20 07:43:17 -04:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2009-06-19 10:32:56 -04:00
|
|
|
return find_first_zero_bit(used, VIDEO_NUM_DEVICES);
|
2008-07-20 07:43:17 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2009-06-19 10:32:56 -04:00
|
|
|
* video_register_device - register video4linux devices
|
2008-12-19 19:28:27 -05:00
|
|
|
* @vdev: video device structure we want to register
|
2008-07-20 07:43:17 -04:00
|
|
|
* @type: type of device to register
|
2009-09-06 06:13:14 -04:00
|
|
|
* @nr: which device node number (0 == /dev/video0, 1 == /dev/video1, ...
|
2008-07-20 07:43:17 -04:00
|
|
|
* -1 == first free)
|
2009-09-06 06:54:00 -04:00
|
|
|
* @warn_if_nr_in_use: warn if the desired device node number
|
|
|
|
* was already in use and another number was chosen instead.
|
2008-07-20 07:43:17 -04:00
|
|
|
*
|
2009-09-06 06:13:14 -04:00
|
|
|
* The registration code assigns minor numbers and device node numbers
|
|
|
|
* based on the requested type and registers the new device node with
|
|
|
|
* the kernel.
|
|
|
|
* An error is returned if no free minor or device node number could be
|
|
|
|
* found, or if the registration of the device node failed.
|
2008-07-20 07:43:17 -04:00
|
|
|
*
|
|
|
|
* Zero is returned on success.
|
|
|
|
*
|
|
|
|
* Valid types are
|
|
|
|
*
|
|
|
|
* %VFL_TYPE_GRABBER - A frame grabber
|
|
|
|
*
|
|
|
|
* %VFL_TYPE_VTX - A teletext device
|
|
|
|
*
|
|
|
|
* %VFL_TYPE_VBI - Vertical blank data (undecoded)
|
|
|
|
*
|
|
|
|
* %VFL_TYPE_RADIO - A radio card
|
|
|
|
*/
|
2009-09-06 06:54:00 -04:00
|
|
|
static int __video_register_device(struct video_device *vdev, int type, int nr,
|
|
|
|
int warn_if_nr_in_use)
|
2008-07-20 07:43:17 -04:00
|
|
|
{
|
|
|
|
int i = 0;
|
|
|
|
int ret;
|
2008-10-04 07:36:54 -04:00
|
|
|
int minor_offset = 0;
|
|
|
|
int minor_cnt = VIDEO_NUM_DEVICES;
|
|
|
|
const char *name_base;
|
2008-12-19 19:28:27 -05:00
|
|
|
void *priv = video_get_drvdata(vdev);
|
2008-07-20 07:43:17 -04:00
|
|
|
|
2008-12-19 19:28:27 -05:00
|
|
|
/* A minor value of -1 marks this video device as never
|
|
|
|
having been registered */
|
2009-03-03 16:51:52 -05:00
|
|
|
vdev->minor = -1;
|
2008-08-22 15:41:03 -04:00
|
|
|
|
2008-12-19 19:28:27 -05:00
|
|
|
/* the release callback MUST be present */
|
2009-03-03 16:51:52 -05:00
|
|
|
WARN_ON(!vdev->release);
|
|
|
|
if (!vdev->release)
|
2008-09-03 16:11:53 -04:00
|
|
|
return -EINVAL;
|
|
|
|
|
2008-12-19 19:28:27 -05:00
|
|
|
/* Part 1: check device type */
|
2008-07-20 07:43:17 -04:00
|
|
|
switch (type) {
|
|
|
|
case VFL_TYPE_GRABBER:
|
|
|
|
name_base = "video";
|
|
|
|
break;
|
|
|
|
case VFL_TYPE_VTX:
|
|
|
|
name_base = "vtx";
|
|
|
|
break;
|
|
|
|
case VFL_TYPE_VBI:
|
|
|
|
name_base = "vbi";
|
|
|
|
break;
|
|
|
|
case VFL_TYPE_RADIO:
|
|
|
|
name_base = "radio";
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
printk(KERN_ERR "%s called with unknown type: %d\n",
|
|
|
|
__func__, type);
|
2008-09-03 15:47:39 -04:00
|
|
|
return -EINVAL;
|
2008-07-20 07:43:17 -04:00
|
|
|
}
|
|
|
|
|
2008-12-19 19:28:27 -05:00
|
|
|
vdev->vfl_type = type;
|
|
|
|
vdev->cdev = NULL;
|
2009-03-13 09:03:04 -04:00
|
|
|
if (vdev->v4l2_dev && vdev->v4l2_dev->dev)
|
2008-12-23 05:35:17 -05:00
|
|
|
vdev->parent = vdev->v4l2_dev->dev;
|
2008-10-04 07:36:54 -04:00
|
|
|
|
2009-09-06 06:13:14 -04:00
|
|
|
/* Part 2: find a free minor, device node number and device index. */
|
2008-10-04 07:36:54 -04:00
|
|
|
#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_VTX:
|
|
|
|
minor_offset = 192;
|
|
|
|
minor_cnt = 32;
|
|
|
|
break;
|
|
|
|
case VFL_TYPE_VBI:
|
|
|
|
minor_offset = 224;
|
|
|
|
minor_cnt = 32;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
minor_offset = 128;
|
|
|
|
minor_cnt = 64;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2009-09-06 06:13:14 -04:00
|
|
|
/* Pick a device node number */
|
2008-07-20 07:43:17 -04:00
|
|
|
mutex_lock(&videodev_lock);
|
2009-09-07 02:40:24 -04:00
|
|
|
nr = devnode_find(vdev, nr == -1 ? 0 : nr, minor_cnt);
|
2008-10-04 07:36:54 -04:00
|
|
|
if (nr == minor_cnt)
|
2009-09-07 02:40:24 -04:00
|
|
|
nr = devnode_find(vdev, 0, minor_cnt);
|
2008-10-04 07:36:54 -04:00
|
|
|
if (nr == minor_cnt) {
|
2009-09-06 06:13:14 -04:00
|
|
|
printk(KERN_ERR "could not get a free device node number\n");
|
2008-10-04 07:36:54 -04:00
|
|
|
mutex_unlock(&videodev_lock);
|
|
|
|
return -ENFILE;
|
2008-07-20 07:43:17 -04:00
|
|
|
}
|
2008-10-04 07:36:54 -04:00
|
|
|
#ifdef CONFIG_VIDEO_FIXED_MINOR_RANGES
|
2009-09-06 06:13:14 -04:00
|
|
|
/* 1-on-1 mapping of device node number to minor number */
|
2008-10-04 07:36:54 -04:00
|
|
|
i = nr;
|
|
|
|
#else
|
2009-09-06 06:13:14 -04:00
|
|
|
/* The device node number and minor numbers are independent, so
|
|
|
|
we just find the first free minor number. */
|
2008-10-04 07:36:54 -04:00
|
|
|
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
|
2008-12-19 19:28:27 -05:00
|
|
|
vdev->minor = i + minor_offset;
|
|
|
|
vdev->num = nr;
|
2009-09-07 02:40:24 -04:00
|
|
|
devnode_set(vdev);
|
|
|
|
|
2008-12-19 19:28:27 -05:00
|
|
|
/* Should not happen since we thought this minor was free */
|
|
|
|
WARN_ON(video_device[vdev->minor] != NULL);
|
2009-06-19 10:32:56 -04:00
|
|
|
vdev->index = get_index(vdev);
|
2008-07-20 07:43:17 -04:00
|
|
|
mutex_unlock(&videodev_lock);
|
|
|
|
|
2008-12-19 19:28:27 -05:00
|
|
|
/* Part 3: Initialize the character device */
|
|
|
|
vdev->cdev = cdev_alloc();
|
|
|
|
if (vdev->cdev == NULL) {
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto cleanup;
|
|
|
|
}
|
|
|
|
if (vdev->fops->unlocked_ioctl)
|
|
|
|
vdev->cdev->ops = &v4l2_unlocked_fops;
|
|
|
|
else
|
|
|
|
vdev->cdev->ops = &v4l2_fops;
|
|
|
|
vdev->cdev->owner = vdev->fops->owner;
|
|
|
|
ret = cdev_add(vdev->cdev, MKDEV(VIDEO_MAJOR, vdev->minor), 1);
|
2008-08-29 16:31:35 -04:00
|
|
|
if (ret < 0) {
|
|
|
|
printk(KERN_ERR "%s: cdev_add failed\n", __func__);
|
2008-12-19 19:28:27 -05:00
|
|
|
kfree(vdev->cdev);
|
|
|
|
vdev->cdev = NULL;
|
|
|
|
goto cleanup;
|
2008-08-29 16:31:35 -04:00
|
|
|
}
|
2008-12-19 19:28:27 -05:00
|
|
|
|
|
|
|
/* Part 4: register the device with sysfs */
|
|
|
|
memset(&vdev->dev, 0, sizeof(vdev->dev));
|
2008-08-24 10:18:47 -04:00
|
|
|
/* The memset above cleared the device's drvdata, so
|
|
|
|
put back the copy we made earlier. */
|
2008-12-19 19:28:27 -05:00
|
|
|
video_set_drvdata(vdev, priv);
|
|
|
|
vdev->dev.class = &video_class;
|
|
|
|
vdev->dev.devt = MKDEV(VIDEO_MAJOR, vdev->minor);
|
|
|
|
if (vdev->parent)
|
|
|
|
vdev->dev.parent = vdev->parent;
|
2009-09-06 06:13:14 -04:00
|
|
|
dev_set_name(&vdev->dev, "%s%d", name_base, vdev->num);
|
2008-12-19 19:28:27 -05:00
|
|
|
ret = device_register(&vdev->dev);
|
2008-07-20 07:43:17 -04:00
|
|
|
if (ret < 0) {
|
|
|
|
printk(KERN_ERR "%s: device_register failed\n", __func__);
|
2008-12-19 19:28:27 -05:00
|
|
|
goto cleanup;
|
2008-07-20 07:43:17 -04:00
|
|
|
}
|
2008-12-19 19:28:27 -05:00
|
|
|
/* Register the release callback that will be called when the last
|
|
|
|
reference to the device goes away. */
|
|
|
|
vdev->dev.release = v4l2_device_release;
|
2008-07-20 07:43:17 -04:00
|
|
|
|
2009-09-06 06:54:00 -04:00
|
|
|
if (nr != -1 && nr != vdev->num && warn_if_nr_in_use)
|
|
|
|
printk(KERN_WARNING "%s: requested %s%d, got %s%d\n",
|
|
|
|
__func__, name_base, nr, name_base, vdev->num);
|
|
|
|
|
2008-12-19 19:28:27 -05:00
|
|
|
/* Part 5: Activate this minor. The char device can now be used. */
|
|
|
|
mutex_lock(&videodev_lock);
|
|
|
|
video_device[vdev->minor] = vdev;
|
|
|
|
mutex_unlock(&videodev_lock);
|
|
|
|
return 0;
|
2008-08-29 16:31:35 -04:00
|
|
|
|
2008-12-19 19:28:27 -05:00
|
|
|
cleanup:
|
2008-07-20 07:43:17 -04:00
|
|
|
mutex_lock(&videodev_lock);
|
2008-12-19 19:28:27 -05:00
|
|
|
if (vdev->cdev)
|
|
|
|
cdev_del(vdev->cdev);
|
2009-09-07 02:40:24 -04:00
|
|
|
devnode_clear(vdev);
|
2008-07-20 07:43:17 -04:00
|
|
|
mutex_unlock(&videodev_lock);
|
2008-12-19 19:28:27 -05:00
|
|
|
/* Mark this video device as never having been registered. */
|
|
|
|
vdev->minor = -1;
|
2008-07-20 07:43:17 -04:00
|
|
|
return ret;
|
|
|
|
}
|
2009-09-06 06:54:00 -04:00
|
|
|
|
|
|
|
int video_register_device(struct video_device *vdev, int type, int nr)
|
|
|
|
{
|
|
|
|
return __video_register_device(vdev, type, nr, 1);
|
|
|
|
}
|
2009-06-19 10:32:56 -04:00
|
|
|
EXPORT_SYMBOL(video_register_device);
|
2008-07-20 07:43:17 -04:00
|
|
|
|
2009-09-06 06:54:00 -04:00
|
|
|
int video_register_device_no_warn(struct video_device *vdev, int type, int nr)
|
|
|
|
{
|
|
|
|
return __video_register_device(vdev, type, nr, 0);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(video_register_device_no_warn);
|
|
|
|
|
2008-07-20 07:43:17 -04:00
|
|
|
/**
|
|
|
|
* video_unregister_device - unregister a video4linux device
|
2008-12-19 19:28:27 -05:00
|
|
|
* @vdev: the device to unregister
|
2008-07-20 07:43:17 -04:00
|
|
|
*
|
2008-12-19 19:28:27 -05:00
|
|
|
* This unregisters the passed device. Future open calls will
|
|
|
|
* be met with errors.
|
2008-07-20 07:43:17 -04:00
|
|
|
*/
|
2008-12-19 19:28:27 -05:00
|
|
|
void video_unregister_device(struct video_device *vdev)
|
2008-07-20 07:43:17 -04:00
|
|
|
{
|
2008-12-19 19:28:27 -05:00
|
|
|
/* Check if vdev was ever registered at all */
|
|
|
|
if (!vdev || vdev->minor < 0)
|
|
|
|
return;
|
|
|
|
|
|
|
|
mutex_lock(&videodev_lock);
|
|
|
|
set_bit(V4L2_FL_UNREGISTERED, &vdev->flags);
|
|
|
|
mutex_unlock(&videodev_lock);
|
|
|
|
device_unregister(&vdev->dev);
|
2008-07-20 07:43:17 -04:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(video_unregister_device);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Initialise video for linux
|
|
|
|
*/
|
|
|
|
static int __init videodev_init(void)
|
|
|
|
{
|
2008-08-29 16:31:35 -04:00
|
|
|
dev_t dev = MKDEV(VIDEO_MAJOR, 0);
|
2008-07-20 07:43:17 -04:00
|
|
|
int ret;
|
|
|
|
|
|
|
|
printk(KERN_INFO "Linux video capture interface: v2.00\n");
|
2008-08-29 16:31:35 -04:00
|
|
|
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;
|
2008-07-20 07:43:17 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
ret = class_register(&video_class);
|
|
|
|
if (ret < 0) {
|
2008-08-29 16:31:35 -04:00
|
|
|
unregister_chrdev_region(dev, VIDEO_NUM_DEVICES);
|
2008-07-20 07:43:17 -04:00
|
|
|
printk(KERN_WARNING "video_dev: class_register failed\n");
|
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit videodev_exit(void)
|
|
|
|
{
|
2008-08-29 16:31:35 -04:00
|
|
|
dev_t dev = MKDEV(VIDEO_MAJOR, 0);
|
|
|
|
|
2008-07-20 07:43:17 -04:00
|
|
|
class_unregister(&video_class);
|
2008-08-29 16:31:35 -04:00
|
|
|
unregister_chrdev_region(dev, VIDEO_NUM_DEVICES);
|
2008-07-20 07:43:17 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
module_init(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");
|
2009-03-02 13:40:57 -05:00
|
|
|
MODULE_ALIAS_CHARDEV_MAJOR(VIDEO_MAJOR);
|
2008-07-20 07:43:17 -04:00
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Local variables:
|
|
|
|
* c-basic-offset: 8
|
|
|
|
* End:
|
|
|
|
*/
|