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Diffstat (limited to 'drivers/media/video/videodev.c')
-rw-r--r--drivers/media/video/videodev.c433
1 files changed, 0 insertions, 433 deletions
diff --git a/drivers/media/video/videodev.c b/drivers/media/video/videodev.c
deleted file mode 100644
index 078880e4c8c..00000000000
--- a/drivers/media/video/videodev.c
+++ /dev/null
@@ -1,433 +0,0 @@
-/*
- * Video capture interface for Linux
- *
- * A generic video device interface for the LINUX operating system
- * using a set of device structures/vectors for low level operations.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * Author: Alan Cox, <alan@redhat.com>
- *
- * Fixes: 20000516 Claudio Matsuoka <claudio@conectiva.com>
- * - Added procfs support
- */
-
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/smp_lock.h>
-#include <linux/mm.h>
-#include <linux/string.h>
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/kmod.h>
-#include <linux/slab.h>
-#include <linux/devfs_fs_kernel.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
-
-#include <linux/videodev.h>
-
-#define VIDEO_NUM_DEVICES 256
-#define VIDEO_NAME "video4linux"
-
-/*
- * sysfs stuff
- */
-
-static ssize_t show_name(struct class_device *cd, char *buf)
-{
- struct video_device *vfd = container_of(cd, struct video_device, class_dev);
- return sprintf(buf,"%.*s\n",(int)sizeof(vfd->name),vfd->name);
-}
-
-static CLASS_DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
-
-struct video_device *video_device_alloc(void)
-{
- struct video_device *vfd;
-
- vfd = kzalloc(sizeof(*vfd),GFP_KERNEL);
- return vfd;
-}
-
-void video_device_release(struct video_device *vfd)
-{
- kfree(vfd);
-}
-
-static void video_release(struct class_device *cd)
-{
- struct video_device *vfd = container_of(cd, struct video_device, class_dev);
-
-#if 1
- /* needed until all drivers are fixed */
- if (!vfd->release)
- return;
-#endif
- vfd->release(vfd);
-}
-
-static struct class video_class = {
- .name = VIDEO_NAME,
- .release = video_release,
-};
-
-/*
- * Active devices
- */
-
-static struct video_device *video_device[VIDEO_NUM_DEVICES];
-static DEFINE_MUTEX(videodev_lock);
-
-struct video_device* video_devdata(struct file *file)
-{
- return video_device[iminor(file->f_dentry->d_inode)];
-}
-
-/*
- * Open a video device.
- */
-static int video_open(struct inode *inode, struct file *file)
-{
- unsigned int minor = iminor(inode);
- int err = 0;
- struct video_device *vfl;
- struct file_operations *old_fops;
-
- if(minor>=VIDEO_NUM_DEVICES)
- return -ENODEV;
- mutex_lock(&videodev_lock);
- vfl=video_device[minor];
- if(vfl==NULL) {
- mutex_unlock(&videodev_lock);
- request_module("char-major-%d-%d", VIDEO_MAJOR, minor);
- mutex_lock(&videodev_lock);
- vfl=video_device[minor];
- if (vfl==NULL) {
- mutex_unlock(&videodev_lock);
- return -ENODEV;
- }
- }
- old_fops = file->f_op;
- file->f_op = fops_get(vfl->fops);
- if(file->f_op->open)
- err = file->f_op->open(inode,file);
- if (err) {
- fops_put(file->f_op);
- file->f_op = fops_get(old_fops);
- }
- fops_put(old_fops);
- mutex_unlock(&videodev_lock);
- return err;
-}
-
-/*
- * helper function -- handles userspace copying for ioctl arguments
- */
-
-static unsigned int
-video_fix_command(unsigned int cmd)
-{
- switch (cmd) {
- case VIDIOC_OVERLAY_OLD:
- cmd = VIDIOC_OVERLAY;
- break;
- case VIDIOC_S_PARM_OLD:
- cmd = VIDIOC_S_PARM;
- break;
- case VIDIOC_S_CTRL_OLD:
- cmd = VIDIOC_S_CTRL;
- break;
- case VIDIOC_G_AUDIO_OLD:
- cmd = VIDIOC_G_AUDIO;
- break;
- case VIDIOC_G_AUDOUT_OLD:
- cmd = VIDIOC_G_AUDOUT;
- break;
- case VIDIOC_CROPCAP_OLD:
- cmd = VIDIOC_CROPCAP;
- break;
- }
- return cmd;
-}
-
-int
-video_usercopy(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg,
- int (*func)(struct inode *inode, struct file *file,
- unsigned int cmd, void *arg))
-{
- char sbuf[128];
- void *mbuf = NULL;
- void *parg = NULL;
- int err = -EINVAL;
-
- cmd = video_fix_command(cmd);
-
- /* Copy arguments into temp kernel buffer */
- switch (_IOC_DIR(cmd)) {
- case _IOC_NONE:
- parg = NULL;
- break;
- case _IOC_READ:
- case _IOC_WRITE:
- case (_IOC_WRITE | _IOC_READ):
- if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
- parg = sbuf;
- } else {
- /* too big to allocate from stack */
- mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL);
- if (NULL == mbuf)
- return -ENOMEM;
- parg = mbuf;
- }
-
- err = -EFAULT;
- if (_IOC_DIR(cmd) & _IOC_WRITE)
- if (copy_from_user(parg, (void __user *)arg, _IOC_SIZE(cmd)))
- goto out;
- break;
- }
-
- /* call driver */
- err = func(inode, file, cmd, parg);
- if (err == -ENOIOCTLCMD)
- err = -EINVAL;
- if (err < 0)
- goto out;
-
- /* Copy results into user buffer */
- switch (_IOC_DIR(cmd))
- {
- case _IOC_READ:
- case (_IOC_WRITE | _IOC_READ):
- if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
- err = -EFAULT;
- break;
- }
-
-out:
- kfree(mbuf);
- return err;
-}
-
-/*
- * open/release helper functions -- handle exclusive opens
- */
-int video_exclusive_open(struct inode *inode, struct file *file)
-{
- struct video_device *vfl = video_devdata(file);
- int retval = 0;
-
- down(&vfl->lock);
- if (vfl->users) {
- retval = -EBUSY;
- } else {
- vfl->users++;
- }
- up(&vfl->lock);
- return retval;
-}
-
-int video_exclusive_release(struct inode *inode, struct file *file)
-{
- struct video_device *vfl = video_devdata(file);
-
- vfl->users--;
- return 0;
-}
-
-static struct file_operations video_fops;
-
-/**
- * video_register_device - register video4linux devices
- * @vfd: video device structure we want to register
- * @type: type of device to register
- * @nr: which device number (0 == /dev/video0, 1 == /dev/video1, ...
- * -1 == first free)
- *
- * The registration code assigns minor numbers based on the type
- * requested. -ENFILE is returned in all the device slots for this
- * category are full. If not then the minor field is set and the
- * driver initialize function is called (if non %NULL).
- *
- * 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
- */
-
-int video_register_device(struct video_device *vfd, int type, int nr)
-{
- int i=0;
- int base;
- int end;
- char *name_base;
-
- switch(type)
- {
- case VFL_TYPE_GRABBER:
- base=0;
- end=64;
- name_base = "video";
- break;
- case VFL_TYPE_VTX:
- base=192;
- end=224;
- name_base = "vtx";
- break;
- case VFL_TYPE_VBI:
- base=224;
- end=256;
- name_base = "vbi";
- break;
- case VFL_TYPE_RADIO:
- base=64;
- end=128;
- name_base = "radio";
- break;
- default:
- return -1;
- }
-
- /* pick a minor number */
- mutex_lock(&videodev_lock);
- if (nr >= 0 && nr < end-base) {
- /* use the one the driver asked for */
- i = base+nr;
- if (NULL != video_device[i]) {
- mutex_unlock(&videodev_lock);
- return -ENFILE;
- }
- } else {
- /* use first free */
- for(i=base;i<end;i++)
- if (NULL == video_device[i])
- break;
- if (i == end) {
- mutex_unlock(&videodev_lock);
- return -ENFILE;
- }
- }
- video_device[i]=vfd;
- vfd->minor=i;
- mutex_unlock(&videodev_lock);
-
- sprintf(vfd->devfs_name, "v4l/%s%d", name_base, i - base);
- devfs_mk_cdev(MKDEV(VIDEO_MAJOR, vfd->minor),
- S_IFCHR | S_IRUSR | S_IWUSR, vfd->devfs_name);
- init_MUTEX(&vfd->lock);
-
- /* sysfs class */
- memset(&vfd->class_dev, 0x00, sizeof(vfd->class_dev));
- if (vfd->dev)
- vfd->class_dev.dev = vfd->dev;
- vfd->class_dev.class = &video_class;
- vfd->class_dev.devt = MKDEV(VIDEO_MAJOR, vfd->minor);
- strlcpy(vfd->class_dev.class_id, vfd->devfs_name + 4, BUS_ID_SIZE);
- class_device_register(&vfd->class_dev);
- class_device_create_file(&vfd->class_dev,
- &class_device_attr_name);
-
-#if 1
- /* needed until all drivers are fixed */
- if (!vfd->release)
- printk(KERN_WARNING "videodev: \"%s\" has no release callback. "
- "Please fix your driver for proper sysfs support, see "
- "http://lwn.net/Articles/36850/\n", vfd->name);
-#endif
- return 0;
-}
-
-/**
- * video_unregister_device - unregister a video4linux device
- * @vfd: the device to unregister
- *
- * This unregisters the passed device and deassigns the minor
- * number. Future open calls will be met with errors.
- */
-
-void video_unregister_device(struct video_device *vfd)
-{
- mutex_lock(&videodev_lock);
- if(video_device[vfd->minor]!=vfd)
- panic("videodev: bad unregister");
-
- devfs_remove(vfd->devfs_name);
- video_device[vfd->minor]=NULL;
- class_device_unregister(&vfd->class_dev);
- mutex_unlock(&videodev_lock);
-}
-
-
-static struct file_operations video_fops=
-{
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .open = video_open,
-};
-
-/*
- * Initialise video for linux
- */
-
-static int __init videodev_init(void)
-{
- int ret;
-
- printk(KERN_INFO "Linux video capture interface: v1.00\n");
- if (register_chrdev(VIDEO_MAJOR, VIDEO_NAME, &video_fops)) {
- printk(KERN_WARNING "video_dev: unable to get major %d\n", VIDEO_MAJOR);
- return -EIO;
- }
-
- ret = class_register(&video_class);
- if (ret < 0) {
- unregister_chrdev(VIDEO_MAJOR, VIDEO_NAME);
- printk(KERN_WARNING "video_dev: class_register failed\n");
- return -EIO;
- }
-
- return 0;
-}
-
-static void __exit videodev_exit(void)
-{
- class_unregister(&video_class);
- unregister_chrdev(VIDEO_MAJOR, VIDEO_NAME);
-}
-
-module_init(videodev_init)
-module_exit(videodev_exit)
-
-EXPORT_SYMBOL(video_register_device);
-EXPORT_SYMBOL(video_unregister_device);
-EXPORT_SYMBOL(video_devdata);
-EXPORT_SYMBOL(video_usercopy);
-EXPORT_SYMBOL(video_exclusive_open);
-EXPORT_SYMBOL(video_exclusive_release);
-EXPORT_SYMBOL(video_device_alloc);
-EXPORT_SYMBOL(video_device_release);
-
-MODULE_AUTHOR("Alan Cox");
-MODULE_DESCRIPTION("Device registrar for Video4Linux drivers");
-MODULE_LICENSE("GPL");
-
-
-/*
- * Local variables:
- * c-basic-offset: 8
- * End:
- */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-15 02:14:29 +0000