path: root/drivers/media/video/v4l2-common.c

/*
 *	Video for Linux Two
 *
 *	A generic video device interface for the LINUX operating system
 *	using a set of device structures/vectors for low level operations.
 *
 *	This file replaces the videodev.c file that comes with the
 *	regular kernel distribution.
 *
 *	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 <bill@thedirks.org>
 *		based on code by Alan Cox, <alan@cymru.net>
 *
 */

/*
 * 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:
 */

/*
 * Video4linux 1/2 integration by Justin Schoeman
 * <justin@suntiger.ee.up.ac.za>
 * 2.4 PROCFS support ported from 2.4 kernels by
 *  Iñaki García Etxebarria <garetxe@euskalnet.net>
 * Makefile fix by "W. Michael Petullo" <mike@flyn.org>
 * 2.4 devfs support ported from 2.4 kernels by
 *  Dan Merillat <dan@merillat.org>
 * Added Gerd Knorrs v4l1 enhancements (Justin Schoeman)
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/div64.h>
#include <linux/video_decoder.h>
#define __OLD_VIDIOC_ /* To allow fixing old calls*/
#include <media/v4l2-common.h>
#include <media/v4l2-chip-ident.h>

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

#include <linux/videodev.h>

MODULE_AUTHOR("Bill Dirks, Justin Schoeman, Gerd Knorr");
MODULE_DESCRIPTION("misc helper functions for v4l2 device drivers");
MODULE_LICENSE("GPL");

/*
 *
 *	V 4 L 2   D R I V E R   H E L P E R   A P I
 *
 */

/*
 *  Video Standard Operations (contributed by Michael Schimek)
 */


char *v4l2_norm_to_name(v4l2_std_id id)
{
	char *name;
	u32 myid = id;

	/* HACK: ppc32 architecture doesn't have __ucmpdi2 function to handle
	   64 bit comparations. So, on that architecture, with some gcc variants,
	   compilation fails. Currently, the max value is 30bit wide.
	 */
	BUG_ON(myid != id);

	switch (myid) {
	case V4L2_STD_PAL:
		name="PAL";		break;
	case V4L2_STD_PAL_BG:
		name="PAL-BG";		break;
	case V4L2_STD_PAL_DK:
		name="PAL-DK";		break;
	case V4L2_STD_PAL_B:
		name="PAL-B";		break;
	case V4L2_STD_PAL_B1:
		name="PAL-B1";		break;
	case V4L2_STD_PAL_G:
		name="PAL-G";		break;
	case V4L2_STD_PAL_H:
		name="PAL-H";		break;
	case V4L2_STD_PAL_I:
		name="PAL-I";		break;
	case V4L2_STD_PAL_D:
		name="PAL-D";		break;
	case V4L2_STD_PAL_D1:
		name="PAL-D1";		break;
	case V4L2_STD_PAL_K:
		name="PAL-K";		break;
	case V4L2_STD_PAL_M:
		name="PAL-M";		break;
	case V4L2_STD_PAL_N:
		name="PAL-N";		break;
	case V4L2_STD_PAL_Nc:
		name="PAL-Nc";		break;
	case V4L2_STD_PAL_60:
		name="PAL-60";		break;
	case V4L2_STD_NTSC:
		name="NTSC";		break;
	case V4L2_STD_NTSC_M:
		name="NTSC-M";		break;
	case V4L2_STD_NTSC_M_JP:
		name="NTSC-M-JP";	break;
	case V4L2_STD_NTSC_443:
		name="NTSC-443";	break;
	case V4L2_STD_NTSC_M_KR:
		name="NTSC-M-KR";	break;
	case V4L2_STD_SECAM:
		name="SECAM";		break;
	case V4L2_STD_SECAM_DK:
		name="SECAM-DK";	break;
	case V4L2_STD_SECAM_B:
		name="SECAM-B";		break;
	case V4L2_STD_SECAM_D:
		name="SECAM-D";		break;
	case V4L2_STD_SECAM_G:
		name="SECAM-G";		break;
	case V4L2_STD_SECAM_H:
		name="SECAM-H";		break;
	case V4L2_STD_SECAM_K:
		name="SECAM-K";		break;
	case V4L2_STD_SECAM_K1:
		name="SECAM-K1";	break;
	case V4L2_STD_SECAM_L:
		name="SECAM-L";		break;
	case V4L2_STD_SECAM_LC:
		name="SECAM-LC";	break;
	default:
		name="Unknown";		break;
	}

	return name;
}

/* Fill in the fields of a v4l2_standard structure according to the
   'id' and 'transmission' parameters.  Returns negative on error.  */
int v4l2_video_std_construct(struct v4l2_standard *vs,
			     int id, char *name)
{
	u32 index = vs->index;

	memset(vs, 0, sizeof(struct v4l2_standard));
	vs->index = index;
	vs->id    = id;
	if (id & V4L2_STD_525_60) {
		vs->frameperiod.numerator = 1001;
		vs->frameperiod.denominator = 30000;
		vs->framelines = 525;
	} else {
		vs->