diff options
Diffstat (limited to 'drivers/misc/mpu3050/compass/hscdtd002b.c')
| -rwxr-xr-x | drivers/misc/mpu3050/compass/hscdtd002b.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/drivers/misc/mpu3050/compass/hscdtd002b.c b/drivers/misc/mpu3050/compass/hscdtd002b.c new file mode 100755 index 00000000000..bf26cae06d2 --- /dev/null +++ b/drivers/misc/mpu3050/compass/hscdtd002b.c @@ -0,0 +1,163 @@ +/* + $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/>. + $ + */ + +/** + * @brief Provides the interface to setup and handle a compass + * connected to the primary I2C interface of the gyroscope. + * + * @{ + * @file hscdtd002b.c + * @brief Magnetometer setup and handling methods for Alps hscdtd002b + * 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" + +/*----- ALPS HSCDTD002B Registers ------*/ +#define COMPASS_HSCDTD002B_STAT (0x18) +#define COMPASS_HSCDTD002B_CTRL1 (0x1B) +#define COMPASS_HSCDTD002B_CTRL2 (0x1C) +#define COMPASS_HSCDTD002B_CTRL3 (0x1D) +#define COMPASS_HSCDTD002B_DATAX (0x10) + +/* --------------------- */ +/* - Variables. - */ +/* --------------------- */ + +/***************************************** + Compass Initialization Functions +*****************************************/ + +int hscdtd002b_suspend(void *mlsl_handle, + struct ext_slave_descr *slave, + struct ext_slave_platform_data *pdata) +{ + int result = ML_SUCCESS; + + /* Power mode: stand-by */ + result = + MLSLSerialWriteSingle(mlsl_handle, pdata->address, + COMPASS_HSCDTD002B_CTRL1, 0x00); + ERROR_CHECK(result); + MLOSSleep(1); /* turn-off time */ + + return result; +} + +int hscdtd002b_resume(void *mlsl_handle, + struct ext_slave_descr *slave, + struct ext_slave_platform_data *pdata) +{ + int result = ML_SUCCESS; + + /* Soft reset */ + result = + MLSLSerialWriteSingle(mlsl_handle, pdata->address, + COMPASS_HSCDTD002B_CTRL3, 0x80); + ERROR_CHECK(result); + /* Force state; Power mode: active */ + result = + MLSLSerialWriteSingle(mlsl_handle, pdata->address, + COMPASS_HSCDTD002B_CTRL1, 0x82); + ERROR_CHECK(result); + /* Data ready enable */ + result = + MLSLSerialWriteSingle(mlsl_handle, pdata->address, + COMPASS_HSCDTD002B_CTRL2, 0x08); + ERROR_CHECK(result); + MLOSSleep(1); /* turn-on time */ + + return result; +} + +int hscdtd002b_read(void *mlsl_handle, + struct ext_slave_descr *slave, + struct ext_slave_platform_data *pdata, + unsigned char *data) +{ + unsigned char stat; + tMLError result = ML_SUCCESS; + int status = ML_SUCCESS; + + /* Read status reg. to check if data is ready */ + result = + MLSLSerialRead(mlsl_handle, pdata->address, + COMPASS_HSCDTD002B_STAT, 1, &stat); + ERROR_CHECK(result); + if (stat & 0x40) { + result = + MLSLSerialRead(mlsl_handle, pdata->address, + COMPASS_HSCDTD002B_DATAX, 6, + (unsigned char *) data); + ERROR_CHECK(result); + status = ML_SUCCESS; + } else if (stat & 0x20) { + status = ML_ERROR_COMPASS_DATA_OVERFLOW; + } else { + status = ML_ERROR_COMPASS_DATA_NOT_READY; + } + /* trigger next measurement read */ + result = + MLSLSerialWriteSingle(mlsl_handle, pdata->address, + COMPASS_HSCDTD002B_CTRL3, 0x40); + ERROR_CHECK(result); + + return status; +} + +struct ext_slave_descr hscdtd002b_descr = { + /*.init = */ NULL, + /*.exit = */ NULL, + /*.suspend = */ hscdtd002b_suspend, + /*.resume = */ hscdtd002b_resume, + /*.read = */ hscdtd002b_read, + /*.config = */ NULL, + /*.get_config = */ NULL, + /*.name = */ "hscdtd002b", + /*.type = */ EXT_SLAVE_TYPE_COMPASS, + /*.id = */ COMPASS_ID_HSCDTD002B, + /*.reg = */ 0x10, + /*.len = */ 6, + /*.endian = */ EXT_SLAVE_LITTLE_ENDIAN, + /*.range = */ {9830, 4000}, +}; + +struct ext_slave_descr *hscdtd002b_get_slave_descr(void) +{ + return &hscdtd002b_descr; +} +EXPORT_SYMBOL(hscdtd002b_get_slave_descr); + +/** + * @} +**/ |