V4L/DVB (8427): videodev: split off the ioctl handling into v4l2-ioctl.c
videodev.c became top-heavy so all the ioctl processing has been split off into v4l2-ioctl.c. This means videodev.c is back to its original purpose: creating and registering v4l devices. Since videodev.c and v4l2-ioctl.c should still remain one module (as least for now) I also had to rename videodev.c to v4l2-dev.c to prevent a circular dependency when building a videodev.ko module. This is not a bad thing, since the source and header now have the same name. And the v4l2- prefix is useful to see which sources are generic v4l2 support code. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Hans Verkuil
Mauro Carvalho Chehab
Родитель
a4e0d9af40
Коммит
27a5e6d3fc
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@ -10,6 +10,8 @@ msp3400-objs := msp3400-driver.o msp3400-kthreads.o
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stkwebcam-objs := stk-webcam.o stk-sensor.o
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videodev-objs := v4l2-dev.o v4l2-ioctl.o
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obj-$(CONFIG_VIDEO_DEV) += videodev.o compat_ioctl32.o v4l2-int-device.o
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obj-$(CONFIG_VIDEO_V4L2_COMMON) += v4l2-common.o
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@ -0,0 +1,424 @@
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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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* Authors: Alan Cox, <alan@redhat.com> (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 <linux/smp_lock.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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#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 *vfd = container_of(cd, struct video_device,
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class_dev);
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return sprintf(buf, "%i\n", vfd->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 *vfd = container_of(cd, struct video_device,
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class_dev);
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return sprintf(buf, "%.*s\n", (int)sizeof(vfd->name), vfd->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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struct video_device *video_device_alloc(void)
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{
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struct video_device *vfd;
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vfd = kzalloc(sizeof(*vfd), GFP_KERNEL);
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return vfd;
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}
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EXPORT_SYMBOL(video_device_alloc);
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void video_device_release(struct video_device *vfd)
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{
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kfree(vfd);
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}
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EXPORT_SYMBOL(video_device_release);
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static void video_release(struct device *cd)
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{
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struct video_device *vfd = container_of(cd, struct video_device,
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class_dev);
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#if 1
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/* needed until all drivers are fixed */
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if (!vfd->release)
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return;
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#endif
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vfd->release(vfd);
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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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.dev_release = video_release,
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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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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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/*
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* Open a video device - FIXME: Obsoleted
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*/
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static int video_open(struct inode *inode, struct file *file)
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{
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unsigned int minor = iminor(inode);
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int err = 0;
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struct video_device *vfl;
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const struct file_operations *old_fops;
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if (minor >= VIDEO_NUM_DEVICES)
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return -ENODEV;
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lock_kernel();
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mutex_lock(&videodev_lock);
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vfl = video_device[minor];
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if (vfl == NULL) {
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mutex_unlock(&videodev_lock);
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request_module("char-major-%d-%d", VIDEO_MAJOR, minor);
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mutex_lock(&videodev_lock);
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vfl = video_device[minor];
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if (vfl == NULL) {
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mutex_unlock(&videodev_lock);
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unlock_kernel();
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return -ENODEV;
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}
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}
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old_fops = file->f_op;
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file->f_op = fops_get(vfl->fops);
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if (file->f_op->open)
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err = file->f_op->open(inode, file);
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if (err) {
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fops_put(file->f_op);
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file->f_op = fops_get(old_fops);
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}
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fops_put(old_fops);
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mutex_unlock(&videodev_lock);
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unlock_kernel();
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return err;
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}
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/*
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* open/release helper functions -- handle exclusive opens
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* Should be removed soon
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*/
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int video_exclusive_open(struct inode *inode, struct file *file)
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{
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struct video_device *vfl = video_devdata(file);
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int retval = 0;
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mutex_lock(&vfl->lock);
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if (vfl->users)
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retval = -EBUSY;
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else
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vfl->users++;
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mutex_unlock(&vfl->lock);
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return retval;
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}
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EXPORT_SYMBOL(video_exclusive_open);
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int video_exclusive_release(struct inode *inode, struct file *file)
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{
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struct video_device *vfl = video_devdata(file);
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vfl->users--;
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return 0;
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}
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EXPORT_SYMBOL(video_exclusive_release);
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/**
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* get_index - assign stream number based on parent device
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* @vdev: video_device to assign index number to, vdev->dev should be assigned
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* @num: -1 if auto assign, requested number otherwise
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*
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*
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* returns -ENFILE if num is already in use, a free index number if
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* successful.
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*/
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static int get_index(struct video_device *vdev, int num)
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{
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u32 used = 0;
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const int max_index = sizeof(used) * 8 - 1;
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int i;
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/* Currently a single v4l driver instance cannot create more than
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32 devices.
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Increase to u64 or an array of u32 if more are needed. */
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if (num > max_index) {
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printk(KERN_ERR "videodev: %s num is too large\n", __func__);
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return -EINVAL;
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}
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for (i = 0; i < VIDEO_NUM_DEVICES; i++) {
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if (video_device[i] != NULL &&
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video_device[i] != vdev &&
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video_device[i]->dev == vdev->dev) {
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used |= 1 << video_device[i]->index;
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}
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}
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if (num >= 0) {
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if (used & (1 << num))
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return -ENFILE;
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return num;
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}
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i = ffz(used);
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return i > max_index ? -ENFILE : i;
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}
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static const struct file_operations video_fops;
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int video_register_device(struct video_device *vfd, int type, int nr)
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{
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return video_register_device_index(vfd, type, nr, -1);
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}
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EXPORT_SYMBOL(video_register_device);
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/**
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* video_register_device - register video4linux devices
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* @vfd: video device structure we want to register
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* @type: type of device to register
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* @nr: which device number (0 == /dev/video0, 1 == /dev/video1, ...
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* -1 == first free)
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*
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* The registration code assigns minor numbers based on the type
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* requested. -ENFILE is returned in all the device slots for this
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* category are full. If not then the minor field is set and the
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* driver initialize function is called (if non %NULL).
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*
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* Zero is returned on success.
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*
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* Valid types are
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*
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* %VFL_TYPE_GRABBER - A frame grabber
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*
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* %VFL_TYPE_VTX - A teletext device
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*
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* %VFL_TYPE_VBI - Vertical blank data (undecoded)
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*
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* %VFL_TYPE_RADIO - A radio card
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*/
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int video_register_device_index(struct video_device *vfd, int type, int nr,
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int index)
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{
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int i = 0;
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int base;
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int end;
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int ret;
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char *name_base;
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switch (type) {
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case VFL_TYPE_GRABBER:
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base = MINOR_VFL_TYPE_GRABBER_MIN;
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end = MINOR_VFL_TYPE_GRABBER_MAX+1;
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name_base = "video";
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break;
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case VFL_TYPE_VTX:
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base = MINOR_VFL_TYPE_VTX_MIN;
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end = MINOR_VFL_TYPE_VTX_MAX+1;
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name_base = "vtx";
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break;
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case VFL_TYPE_VBI:
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base = MINOR_VFL_TYPE_VBI_MIN;
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end = MINOR_VFL_TYPE_VBI_MAX+1;
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name_base = "vbi";
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break;
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case VFL_TYPE_RADIO:
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base = MINOR_VFL_TYPE_RADIO_MIN;
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end = MINOR_VFL_TYPE_RADIO_MAX+1;
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name_base = "radio";
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break;
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default:
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printk(KERN_ERR "%s called with unknown type: %d\n",
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__func__, type);
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return -1;
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}
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/* pick a minor number */
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mutex_lock(&videodev_lock);
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if (nr >= 0 && nr < end-base) {
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/* use the one the driver asked for */
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i = base + nr;
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if (NULL != video_device[i]) {
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mutex_unlock(&videodev_lock);
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return -ENFILE;
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}
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} else {
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/* use first free */
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for (i = base; i < end; i++)
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if (NULL == video_device[i])
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break;
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if (i == end) {
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mutex_unlock(&videodev_lock);
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return -ENFILE;
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}
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}
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video_device[i] = vfd;
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vfd->minor = i;
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ret = get_index(vfd, index);
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vfd->index = ret;
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mutex_unlock(&videodev_lock);
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if (ret < 0) {
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printk(KERN_ERR "%s: get_index failed\n", __func__);
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goto fail_minor;
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}
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mutex_init(&vfd->lock);
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/* sysfs class */
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memset(&vfd->class_dev, 0x00, sizeof(vfd->class_dev));
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vfd->class_dev.class = &video_class;
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vfd->class_dev.devt = MKDEV(VIDEO_MAJOR, vfd->minor);
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if (vfd->dev)
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vfd->class_dev.parent = vfd->dev;
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sprintf(vfd->class_dev.bus_id, "%s%d", name_base, i - base);
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ret = device_register(&vfd->class_dev);
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if (ret < 0) {
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printk(KERN_ERR "%s: device_register failed\n", __func__);
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goto fail_minor;
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}
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#if 1
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/* needed until all drivers are fixed */
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if (!vfd->release)
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printk(KERN_WARNING "videodev: \"%s\" has no release callback. "
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"Please fix your driver for proper sysfs support, see "
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"http://lwn.net/Articles/36850/\n", vfd->name);
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#endif
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return 0;
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fail_minor:
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mutex_lock(&videodev_lock);
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video_device[vfd->minor] = NULL;
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vfd->minor = -1;
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mutex_unlock(&videodev_lock);
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return ret;
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}
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EXPORT_SYMBOL(video_register_device_index);
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/**
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* video_unregister_device - unregister a video4linux device
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* @vfd: the device to unregister
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*
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* This unregisters the passed device and deassigns the minor
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* number. Future open calls will be met with errors.
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*/
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void video_unregister_device(struct video_device *vfd)
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{
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mutex_lock(&videodev_lock);
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if (video_device[vfd->minor] != vfd)
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panic("videodev: bad unregister");
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video_device[vfd->minor] = NULL;
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device_unregister(&vfd->class_dev);
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mutex_unlock(&videodev_lock);
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}
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EXPORT_SYMBOL(video_unregister_device);
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/*
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* Video fs operations
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*/
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static const struct file_operations video_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.open = video_open,
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};
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/*
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* Initialise video for linux
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*/
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static int __init videodev_init(void)
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{
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int ret;
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printk(KERN_INFO "Linux video capture interface: v2.00\n");
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if (register_chrdev(VIDEO_MAJOR, VIDEO_NAME, &video_fops)) {
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printk(KERN_WARNING "video_dev: unable to get major %d\n", VIDEO_MAJOR);
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return -EIO;
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}
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ret = class_register(&video_class);
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if (ret < 0) {
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unregister_chrdev(VIDEO_MAJOR, VIDEO_NAME);
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printk(KERN_WARNING "video_dev: class_register failed\n");
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return -EIO;
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}
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return 0;
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}
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static void __exit videodev_exit(void)
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{
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class_unregister(&video_class);
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unregister_chrdev(VIDEO_MAJOR, VIDEO_NAME);
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}
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module_init(videodev_init)
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module_exit(videodev_exit)
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|
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MODULE_AUTHOR("Alan Cox, Mauro Carvalho Chehab <mchehab@infradead.org>");
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MODULE_DESCRIPTION("Device registrar for Video4Linux drivers v2");
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MODULE_LICENSE("GPL");
|
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|
||||
|
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/*
|
||||
* Local variables:
|
||||
* c-basic-offset: 8
|
||||
* End:
|
||||
*/
|
||||
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