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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 lsm303a.c
* @brief Accelerometer setup and handling methods for ST LSM303
*/
/* ------------------ */
/* - Include Files. - */
/* ------------------ */
#ifdef __KERNEL__
#include <linux/module.h>
#endif
#include "mpu.h"
#include "mlsl.h"
#include "mlos.h"
#include <log.h>
#undef MPL_LOG_TAG
#define MPL_LOG_TAG "MPL-acc"
#define ACCEL_ST_SLEEP_REG (0x20)
#define ACCEL_ST_SLEEP_MASK (0x20)
/* --------------------- */
/* - Variables. - */
/* --------------------- */
/*****************************************
Accelerometer Initialization Functions
*****************************************/
int lsm303dlha_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_ST_SLEEP_REG,
1, ®);
ERROR_CHECK(result);
reg &= ~(0x27);
result =
MLSLSerialWriteSingle(mlsl_handle, pdata->address,
ACCEL_ST_SLEEP_REG, reg);
ERROR_CHECK(result);
return result;
}
/* full scale setting - register & mask */
#define ACCEL_ST_CTRL_REG (0x23)
#define ACCEL_ST_CTRL_MASK (0x30)
int lsm303dlha_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_ST_SLEEP_REG,
1, ®);
ERROR_CHECK(result);
reg |= 0x27;
/*wake up if sleeping */
result =
MLSLSerialWriteSingle(mlsl_handle, pdata->address,
ACCEL_ST_SLEEP_REG, reg);
ERROR_CHECK(result);
result =
MLSLSerialWriteSingle(mlsl_handle, pdata->address, 0x20, 0x37);
ERROR_CHECK(result);
MLOSSleep(500);
reg = 0x40;
/* Full Scale */
reg &= ~ACCEL_ST_CTRL_MASK;
if (slave->range.mantissa == 4) {
slave->range.fraction = 960;
reg |= 0x10;
} else if (slave->range.mantissa == 8) {
slave->range.fraction = 1920;
reg |= 0x30;
} else {
slave->range.mantissa = 2;
slave->range.fraction = 480;
reg |= 0x00;
}
result =
MLSLSerialWriteSingle(mlsl_handle, pdata->address, 0x23, reg);
ERROR_CHECK(result);
/* Configure high pass filter */
result =
MLSLSerialWriteSingle(mlsl_handle, pdata->address, 0x21, 0x0F);
ERROR_CHECK(result);
result =
MLSLSerialWriteSingle(mlsl_handle, pdata->address, 0x32, 0x00);
ERROR_CHECK(result);
/* Configure INT1_DURATION */
result =
MLSLSerialWriteSingle(mlsl_handle, pdata->address, 0x33, 0x7F);
ERROR_CHECK(result);
/* Configure INT1_CFG */
result =
MLSLSerialWriteSingle(mlsl_handle, pdata->address, 0x30, 0x95);
ERROR_CHECK(result);
MLOSSleep(50);
return result;
}
int lsm303dlha_read(void *mlsl_handle,
struct ext_slave_descr *slave,
struct ext_slave_platform_data *pdata,
unsigned char *data)
{
int result;
result = MLSLSerialRead(mlsl_handle, pdata->address,
slave->reg, slave->len, data);
return result;
}
struct ext_slave_descr lsm303dlha_descr = {
/*.init = */ NULL,
/*.exit = */ NULL,
/*.suspend = */ lsm303dlha_suspend,
/*.resume = */ lsm303dlha_resume,
/*.read = */ lsm303dlha_read,
/*.config = */ NULL,
/*.get_config = */ NULL,
/*.name = */ "lsm303dlha",
/*.type = */ EXT_SLAVE_TYPE_ACCELEROMETER,
/*.id = */ ACCEL_ID_LSM303,
/*.reg = */ (0x28 | 0x80), /* 0x80 for burst reads */
/*.len = */ 6,
/*.endian = */ EXT_SLAVE_BIG_ENDIAN,
/*.range = */ {2, 480},
};
struct ext_slave_descr *lsm303dlha_get_slave_descr(void)
{
return &lsm303dlha_descr;
}
EXPORT_SYMBOL(lsm303dlha_get_slave_descr);
/**
* @}
**/
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