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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 mmc314x.c
* @brief Magnetometer setup and handling methods for ???? compass.
*/
/* ------------------ */
/* - 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-compass"
/* --------------------- */
/* - Variables. - */
/* --------------------- */
static int reset_int = 1000;
static int read_count = 1;
static char reset_mode; /* in Z-init section */
#define MMC314X_REG_ST (0x00)
#define MMC314X_REG_X_MSB (0x01)
#define MMC314X_CNTL_MODE_WAKE_UP (0x01)
#define MMC314X_CNTL_MODE_SET (0x02)
#define MMC314X_CNTL_MODE_RESET (0x04)
/*****************************************
Accelerometer Initialization Functions
*****************************************/
int mmc314x_suspend(void *mlsl_handle,
struct ext_slave_descr *slave,
struct ext_slave_platform_data *pdata)
{
int result = ML_SUCCESS;
return result;
}
int mmc314x_resume(void *mlsl_handle,
struct ext_slave_descr *slave,
struct ext_slave_platform_data *pdata)
{
int result;
result =
MLSLSerialWriteSingle(mlsl_handle, pdata->address,
MMC314X_REG_ST, MMC314X_CNTL_MODE_RESET);
ERROR_CHECK(result);
MLOSSleep(10);
result =
MLSLSerialWriteSingle(mlsl_handle, pdata->address,
MMC314X_REG_ST, MMC314X_CNTL_MODE_SET);
ERROR_CHECK(result);
MLOSSleep(10);
read_count = 1;
return ML_SUCCESS;
}
int mmc314x_read(void *mlsl_handle,
struct ext_slave_descr *slave,
struct ext_slave_platform_data *pdata,
unsigned char *data)
{
int result, ii;
short tmp[3];
unsigned char tmpdata[6];
if (read_count > 1000)
read_count = 1;
result =
MLSLSerialRead(mlsl_handle, pdata->address, MMC314X_REG_X_MSB,
6, (unsigned char *) data);
ERROR_CHECK(result);
for (ii = 0; ii < 6; ii++)
tmpdata[ii] = data[ii];
for (ii = 0; ii < 3; ii++) {
tmp[ii] =
(short) ((tmpdata[2 * ii] << 8) + tmpdata[2 * ii + 1]);
tmp[ii] = tmp[ii] - 4096;
tmp[ii] = tmp[ii] * 16;
}
for (ii = 0; ii < 3; ii++) {
data[2 * ii] = (unsigned char) (tmp[ii] >> 8);
data[2 * ii + 1] = (unsigned char) (tmp[ii]);
}
if (read_count % reset_int == 0) {
if (reset_mode) {
result =
MLSLSerialWriteSingle(mlsl_handle,
pdata->address,
MMC314X_REG_ST,
MMC314X_CNTL_MODE_RESET);
ERROR_CHECK(result);
reset_mode = 0;
return ML_ERROR_COMPASS_DATA_NOT_READY;
} else {
result =
MLSLSerialWriteSingle(mlsl_handle,
pdata->address,
MMC314X_REG_ST,
MMC314X_CNTL_MODE_SET);
ERROR_CHECK(result);
reset_mode = 1;
read_count++;
return ML_ERROR_COMPASS_DATA_NOT_READY;
}
}
result =
MLSLSerialWriteSingle(mlsl_handle, pdata->address,
MMC314X_REG_ST,
MMC314X_CNTL_MODE_WAKE_UP);
ERROR_CHECK(result);
read_count++;
return ML_SUCCESS;
}
struct ext_slave_descr mmc314x_descr = {
/*.init = */ NULL,
/*.exit = */ NULL,
/*.suspend = */ mmc314x_suspend,
/*.resume = */ mmc314x_resume,
/*.read = */ mmc314x_read,
/*.config = */ NULL,
/*.get_config = */ NULL,
/*.name = */ "mmc314x",
/*.type = */ EXT_SLAVE_TYPE_COMPASS,
/*.id = */ COMPASS_ID_MMC314X,
/*.reg = */ 0x01,
/*.len = */ 6,
/*.endian = */ EXT_SLAVE_BIG_ENDIAN,
/*.range = */ {400, 0},
};
struct ext_slave_descr *mmc314x_get_slave_descr(void)
{
return &mmc314x_descr;
}
EXPORT_SYMBOL(mmc314x_get_slave_descr);
/**
* @}
**/
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