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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 ACCELDL (Motion Library - Accelerometer Driver Layer)
* @brief Provides the interface to setup and handle an accelerometers
* connected to the secondary I2C interface of the gyroscope.
*
* @{
* @file mma845x.c
* @brief Accelerometer setup and handling methods for Freescale MMA845X
*/
/* ------------------ */
/* - Include Files. - */
/* ------------------ */
#ifdef __KERNEL__
#include <linux/module.h>
#endif
#include <stdlib.h>
#include "mpu.h"
#include "mlsl.h"
#include "mlos.h"
#include <string.h>
#include <log.h>
#undef MPL_LOG_TAG
#define MPL_LOG_TAG "MPL-acc"
#define ACCEL_MMA845X_CTRL_REG1 (0x2A)
#define ACCEL_MMA845X_SLEEP_MASK (0x01)
/* full scale setting - register & mask */
#define ACCEL_MMA845X_CFG_REG (0x0E)
#define ACCEL_MMA845X_CTRL_MASK (0x03)
/* --------------------- */
/* - Variables. - */
/* --------------------- */
/*****************************************
Accelerometer Initialization Functions
*****************************************/
int mma845x_suspend(void *mlsl_handle,
struct ext_slave_descr *slave,
struct ext_slave_platform_data *pdata)
{
int result;
unsigned char reg;
result =
MLSLSerialRead(mlsl_handle, pdata->address,
ACCEL_MMA845X_CTRL_REG1, 1, ®);
ERROR_CHECK(result);
reg &= ~ACCEL_MMA845X_SLEEP_MASK;
result =
MLSLSerialWriteSingle(mlsl_handle, pdata->address,
ACCEL_MMA845X_CTRL_REG1, reg);
ERROR_CHECK(result);
return result;
}
int mma845x_resume(void *mlsl_handle,
struct ext_slave_descr *slave,
struct ext_slave_platform_data *pdata)
{
int result = ML_SUCCESS;
unsigned char reg;
result = MLSLSerialRead(mlsl_handle, pdata->address,
ACCEL_MMA845X_CFG_REG, 1, ®);
ERROR_CHECK(result);
/* data rate = 200Hz */
/* Full Scale */
reg &= ~ACCEL_MMA845X_CTRL_MASK;
if (slave->range.mantissa == 4)
reg |= 0x1;
else if (slave->range.mantissa == 8)
reg |= 0x2;
else {
slave->range.mantissa = 2;
reg |= 0x0;
}
slave->range.fraction = 0;
result = MLSLSerialWriteSingle(mlsl_handle, pdata->address,
ACCEL_MMA845X_CFG_REG, reg);
ERROR_CHECK(result);
/* 200Hz + active mode */
result =
MLSLSerialWriteSingle(mlsl_handle, pdata->address,
ACCEL_MMA845X_CTRL_REG1, 0x11);
ERROR_CHECK(result);
return result;
}
int mma845x_read(void *mlsl_handle,
struct ext_slave_descr *slave,
struct ext_slave_platform_data *pdata,
unsigned char *data)
{
int result;
unsigned char local_data[7]; /* Status register + 6 bytes data */
result = MLSLSerialRead(mlsl_handle, pdata->address,
slave->reg, sizeof(local_data), local_data);
ERROR_CHECK(result);
memcpy(data, &local_data[1], slave->len);
return result;
}
struct ext_slave_descr mma845x_descr = {
/*.init = */ NULL,
/*.exit = */ NULL,
/*.suspend = */ mma845x_suspend,
/*.resume = */ mma845x_resume,
/*.read = */ mma845x_read,
/*.config = */ NULL,
/*.get_config = */ NULL,
/*.name = */ "mma845x",
/*.type = */ EXT_SLAVE_TYPE_ACCELEROMETER,
/*.id = */ ACCEL_ID_MMA845X,
/*.reg = */ 0x00,
/*.len = */ 6,
/*.endian = */ EXT_SLAVE_FS16_BIG_ENDIAN,
/*.range = */ {2, 0},
};
struct ext_slave_descr *mma845x_get_slave_descr(void)
{
return &mma845x_descr;
}
EXPORT_SYMBOL(mma845x_get_slave_descr);
/**
* @}
*/
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