path: root/drivers/media/video/cx25840/cx25840-core.c

/* cx25840 - Conexant CX25840 audio/video decoder driver
 *
 * Copyright (C) 2004 Ulf Eklund
 *
 * Based on the saa7115 driver and on the first verison of Chris Kennedy's
 * cx25840 driver.
 *
 * Changes by Tyler Trafford <tatrafford@comcast.net>
 *    - cleanup/rewrite for V4L2 API (2005)
 *
 * VBI support by Hans Verkuil <hverkuil@xs4all.nl>.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <linux/i2c.h>
#include <media/audiochip.h>
#include <media/v4l2-common.h>

#include "cx25840.h"

MODULE_DESCRIPTION("Conexant CX25840 audio/video decoder driver");
MODULE_AUTHOR("Ulf Eklund, Chris Kennedy, Hans Verkuil, Tyler Trafford");
MODULE_LICENSE("GPL");

static unsigned short normal_i2c[] = { 0x88 >> 1, I2C_CLIENT_END };


int debug = 0;

module_param(debug, bool, 0644);

MODULE_PARM_DESC(debug, "Debugging messages [0=Off (default) 1=On]");

I2C_CLIENT_INSMOD;

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

int cx25840_write(struct i2c_client *client, u16 addr, u8 value)
{
	u8 buffer[3];
	buffer[0] = addr >> 8;
	buffer[1] = addr & 0xff;
	buffer[2] = value;
	return i2c_master_send(client, buffer, 3);
}

int cx25840_write4(struct i2c_client *client, u16 addr, u32 value)
{
	u8 buffer[6];
	buffer[0] = addr >> 8;
	buffer[1] = addr & 0xff;
	buffer[2] = value >> 24;
	buffer[3] = (value >> 16) & 0xff;
	buffer[4] = (value >> 8) & 0xff;
	buffer[5] = value & 0xff;
	return i2c_master_send(client, buffer, 6);
}

u8 cx25840_read(struct i2c_client * client, u16 addr)
{
	u8 buffer[2];
	buffer[0] = addr >> 8;
	buffer[1] = addr & 0xff;

	if (i2c_master_send(client, buffer, 2) < 2)
		return 0;

	if (i2c_master_recv(client, buffer, 1) < 1)
		return 0;

	return buffer[0];
}

u32 cx25840_read4(struct i2c_client * client, u16 addr)
{
	u8 buffer[4];
	buffer[0] = addr >> 8;
	buffer[1] = addr & 0xff;

	if (i2c_master_send(client, buffer, 2) < 2)
		return 0;

	if (i2c_master_recv(client, buffer, 4) < 4)
		return 0;

	return (buffer[0] << 24) | (buffer[1] << 16) |
	    (buffer[2] << 8) | buffer[3];
}

int cx25840_and_or(struct i2c_client *client, u16 addr, u8 and_mask,
		   u8 or