path: root/drivers/media/video/v4l1-compat.c

/*
 *
 *	Video for Linux Two
 *	Backward Compatibility Layer
 *
 *	Support subroutines for providing V4L2 drivers with backward
 *	compatibility with applications using the old API.
 *
 *	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:	Bill Dirks <bdirks@pacbell.net>
 *		et al.
 *
 */


#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/videodev.h>
#include <media/v4l2-common.h>

#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/pgtable.h>

#ifdef CONFIG_KMOD
#include <linux/kmod.h>
#endif

static unsigned int debug  = 0;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug,"enable debug messages");
MODULE_AUTHOR("Bill Dirks");
MODULE_DESCRIPTION("v4l(1) compatibility layer for v4l2 drivers.");
MODULE_LICENSE("GPL");

#define dprintk(fmt, arg...)	if (debug) \
	printk(KERN_DEBUG "v4l1-compat: " fmt , ## arg)

/*
 *	I O C T L   T R A N S L A T I O N
 *
 *	From here on down is the code for translating the numerous
 *	ioctl commands from the old API to the new API.
 */

static int
get_v4l_control(struct inode            *inode,
		struct file             *file,
		int			cid,
		v4l2_kioctl             drv)
{
	struct v4l2_queryctrl	qctrl2;
	struct v4l2_control	ctrl2;
	int			err;

	qctrl2.id = cid;
	err = drv(inode, file, VIDIOC_QUERYCTRL, &qctrl2);
	if (err < 0)
		dprintk("VIDIOC_QUERYCTRL: %d\n",err);
	if (err == 0 &&
	    !(qctrl2.flags & V4L2_CTRL_FLAG_DISABLED))
	{
		ctrl2.id = qctrl2.id;
		err = drv(inode, file, VIDIOC_G_CTRL, &ctrl2);
		if (err < 0) {
			dprintk("VIDIOC_G_CTRL: %d\n",err);
			return 0;
		}
		return ((ctrl2.value - qctrl2.minimum) * 65535
			 + (qctrl2.maximum - qctrl2.minimum) / 2)
			/ (qctrl2.maximum - qctrl2.minimum);
	}
	return 0;
}

static int
set_v4l_control(struct inode            *inode,
		struct file             *file,
		int			cid,
		int			value,
		v4l2_kioctl             drv)
{
	struct v4l2_queryctrl	qctrl2;
	struct v4l2_control	ctrl2;
	int			err;

	qctrl2.id = cid;
	err = drv(inode, file, VIDIOC_QUERYCTRL, &qctrl2);
	if (err < 0)
		dprintk("VIDIOC_QUERYCTRL: %d\n",err);
	if (err == 0 &&
	    !(qctrl2.flags & V4L2_CTRL_FLAG_DISABLED) &&
	    !(qctrl2.flags & V4L2_CTRL_FLAG_GRABBED))
	{
		if (value < 0)
			value = 0;
		if (value > 65535)
			value = 65535;
		if (value && qctrl2.type == V4L2_CTRL_TYPE_BOOLEAN)
			value = 65535;
		ctrl2.id = qctrl2.id;
		ctrl2.value =
			(value * (qctrl2.maximum - qctrl2.minimum)
			 + 32767)
			/ 65535;
		ctrl2.value += qctrl2.minimum;
		err = drv(inode, file, VIDIOC_S_CTRL, &ctrl2);
		if (err < 0)
			dprintk("VIDIOC_S_CTRL: %d\n",err);
	}
	return 0;
}

/* ----------------------------------------------------------------- */

static int palette2pixelformat[] = {
	[VIDEO_PALETTE_GREY]    = V4L2_PIX_FMT_GREY,
	[VIDEO_PALETTE_RGB555]  = V4L2_PIX_FMT_RGB555,
	[VIDEO_PALETTE_RGB565]  = V4L2_PIX_FMT_RGB565,
	[VIDEO_PALETTE_RGB24]   = V4L2_PIX_FMT_BGR24,
	[VIDEO_PALETTE_RGB32]   = V4L2_PIX_FMT_BGR32,
	/* yuv packed pixel */
	[VIDEO_PALETTE_YUYV]    = V4L2_PIX_FMT_YUYV,
	[VIDEO_PALETTE_YUV422]  = V4L2_PIX_FMT_YUYV,
	[VIDEO_PALETTE_UYVY]    = V4L2_PIX_FMT_UYVY,
	/* yuv planar */
	[VIDEO_PALETTE_YUV410P] = V4L2_PIX_FMT_YUV410,
	[VIDEO_PALETTE_YUV420]  = V4L2_PIX_FMT_YUV420,
	[VIDEO_PALETTE_YUV420P] = V4L2_PIX_FMT_YUV420,
	[VIDEO_PALETTE_YUV411P] = V4L2_PIX_FMT_YUV411P,