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/*
$License:
Copyright (C) 2010 InvenSense Corporation, All Rights Reserved.
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, see <http://www.gnu.org/licenses/>.
$
*/
/**
* @defgroup
* @brief
*
* @{
* @file mpu-i2c.c
* @brief
*
*/
#include <linux/i2c.h>
#include "mpu.h"
int sensor_i2c_write(struct i2c_adapter *i2c_adap,
unsigned char address,
unsigned int len, unsigned char const *data)
{
struct i2c_msg msgs[1];
int res;
if (NULL == data || NULL == i2c_adap)
return -EINVAL;
msgs[0].addr = address;
msgs[0].flags = 0; /* write */
msgs[0].buf = (unsigned char *) data;
msgs[0].len = len;
res = i2c_transfer(i2c_adap, msgs, 1);
if (res < 1)
return res;
else
return 0;
}
int sensor_i2c_write_register(struct i2c_adapter *i2c_adap,
unsigned char address,
unsigned char reg, unsigned char value)
{
unsigned char data[2];
data[0] = reg;
data[1] = value;
return sensor_i2c_write(i2c_adap, address, 2, data);
}
int sensor_i2c_read(struct i2c_adapter *i2c_adap,
unsigned char address,
unsigned char reg,
unsigned int len, unsigned char *data)
{
struct i2c_msg msgs[2];
int res;
if (NULL == data || NULL == i2c_adap)
return -EINVAL;
msgs[0].addr = address;
msgs[0].flags = 0; /* write */
msgs[0].buf = ®
msgs[0].len = 1;
msgs[1].addr = address;
msgs[1].flags = I2C_M_RD;
msgs[1].buf = data;
msgs[1].len = len;
res = i2c_transfer(i2c_adap, msgs, 2);
if (res < 2)
return res;
else
return 0;
}
int mpu_memory_read(struct i2c_adapter *i2c_adap,
unsigned char mpu_addr,
unsigned short mem_addr,
unsigned int len, unsigned char *data)
{
unsigned char bank[2];
unsigned char addr[2];
unsigned char buf;
struct i2c_msg msgs[4];
int ret;
if (NULL == data || NULL == i2c_adap)
return -EINVAL;
bank[0] = MPUREG_BANK_SEL;
bank[1] = mem_addr >> 8;
addr[0] = MPUREG_MEM_START_ADDR;
addr[1] = mem_addr & 0xFF;
buf = MPUREG_MEM_R_W;
/* Write Message */
msgs[0].addr = mpu_addr;
msgs[0].flags = 0;
msgs[0].buf = bank;
msgs[0].len = sizeof(bank);
msgs[1].addr = mpu_addr;
msgs[1].flags = 0;
msgs[1].buf = addr;
msgs[1].len = sizeof(addr);
msgs[2].addr = mpu_addr;
msgs[2].flags = 0;
msgs[2].buf = &buf;
msgs[2].len = 1;
msgs[3].addr = mpu_addr;
msgs[3].flags = I2C_M_RD;
msgs[3].buf = data;
msgs[3].len = len;
ret = i2c_transfer(i2c_adap, msgs, 4);
if (ret != 4)
return ret;
else
return 0;
}
int mpu_memory_write(struct i2c_adapter *i2c_adap,
unsigned char mpu_addr,
unsigned short mem_addr,
unsigned int len, unsigned char const *data)
{
unsigned char bank[2];
unsigned char addr[2];
unsigned char buf[513];
struct i2c_msg msgs[3];
int ret;
if (NULL == data || NULL == i2c_adap)
return -EINVAL;
if (len >= (sizeof(buf) - 1))
return -ENOMEM;
bank[0] = MPUREG_BANK_SEL;
bank[1] = mem_addr >> 8;
addr[0] = MPUREG_MEM_START_ADDR;
addr[1] = mem_addr & 0xFF;
buf[0] = MPUREG_MEM_R_W;
memcpy(buf + 1, data, len);
/* Write Message */
msgs[0].addr = mpu_addr;
msgs[0].flags = 0;
msgs[0].buf = bank;
msgs[0].len = sizeof(bank);
msgs[1].addr = mpu_addr;
msgs[1].flags = 0;
msgs[1].buf = addr;
msgs[1].len = sizeof(addr);
msgs[2].addr = mpu_addr;
msgs[2].flags = 0;
msgs[2].buf = (unsigned char *) buf;
msgs[2].len = len + 1;
ret = i2c_transfer(i2c_adap, msgs, 3);
if (ret != 3)
return ret;
else
return 0;
}
/**
* @}
*/
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