triton.c

Linux Kernel 2.6.9 for OMAP1710

/* 
 * linux/drivers/i2c/chips/triton.c
 * 
 * Provides API's for accessing registers of TRITON Chip.
 *
 * Copyright (C) 2004 Texas Instruments, Inc. 
 * 
 * This package is free software; you can redistribute it and/or modify 
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation. 
 * 
 * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 
 */

#include <linux/i2c.h>
#include <asm/arch/triton.h>

/* TRITON Device Address */
#define TRITON_I2C_ADDR		0x2D

int triton_i2c_write( u8 val, u8 addr){
	
	struct i2c_adapter *adap;
	int err;
	struct i2c_msg msg[1];
	unsigned char data[2];

	adap = i2c_get_adapter(0);

	if ( !adap ) {
		return -ENODEV;
	}
	msg->addr = TRITON_I2C_ADDR;
	msg->flags = 0;
	msg->len = 2;
	msg->buf = data;
	data[0] = addr;
	data[1] = val ;
	err = i2c_transfer(adap,msg,1);

	if ( err >= 0 ){
		return 0;
	}
	return err;
}

int triton_i2c_read( u8 *val , u8 addr){
	struct i2c_adapter *adap;
	int err;
	struct i2c_msg msg[1];
	unsigned char data[1];

	adap = i2c_get_adapter(0);
	if (!adap){
		return -ENODEV;
	}
	msg->addr = TRITON_I2C_ADDR;
	msg->flags = 0;
	msg->len = 1;
	msg->buf = data;
	data[0] = addr;
	err = i2c_transfer(adap, msg, 1);
	if (err<0)
		return err;
	msg->addr = 0x2D;	
	msg->flags = I2C_M_RD;
	msg->len = 1;
	msg->buf = data;
	data[0] = 0xFF;
	err = i2c_transfer(adap, msg, 1);
	*val = data[0];

	if (err >= 0){
		return 0;
	}
	return err;
}


EXPORT_SYMBOL(triton_i2c_read);
EXPORT_SYMBOL(triton_i2c_write);