/*
$License:
Copyright (C) 2011 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 - Pressure Driver Layer)
* @brief Provides the interface to setup and handle a pressure
* connected to the secondary I2C interface of the gyroscope.
*
* @{
* @file bma085.c
* @brief Pressure setup and handling methods.
*/
/* ------------------ */
/* - Include Files. - */
/* ------------------ */
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include "mpu-dev.h"
#include <linux/mpu.h>
#include "mlsl.h"
#include "log.h"
/*
* this structure holds all device specific calibration parameters
*/
struct bmp085_calibration_param_t {
short ac1;
short ac2;
short ac3;
unsigned short ac4;
unsigned short ac5;
unsigned short ac6;
short b1;
short b2;
short mb;
short mc;
short md;
long param_b5;
};
struct bmp085_calibration_param_t cal_param;
#define PRESSURE_BMA085_PARAM_MG 3038 /* calibration parameter */
#define PRESSURE_BMA085_PARAM_MH -7357 /* calibration parameter */
#define PRESSURE_BMA085_PARAM_MI 3791 /* calibration parameter */
/*********************************************
* Pressure Initialization Functions
*********************************************/
static int bma085_suspend(void *mlsl_handle,
struct ext_slave_descr *slave,
struct ext_slave_platform_data *pdata)
{
int result = INV_SUCCESS;
return result;
}
#define PRESSURE_BMA085_PROM_START_ADDR (0xAA)
#define PRESSURE_BMA085_PROM_DATA_LEN (22)
#define PRESSURE_BMP085_CTRL_MEAS_REG (0xF4)
/* temperature measurent */
#define PRESSURE_BMP085_T_MEAS (0x2E)
/* pressure measurement; oversampling_setting */
#define PRESSURE_BMP085_P_MEAS_OSS_0 (0x34)
#define PRESSURE_BMP085_P_MEAS_OSS_1 (0x74)
#define PRESSURE_BMP085_P_MEAS_OSS_2 (0xB4)
#define PRESSURE_BMP085_P_MEAS_OSS_3 (0xF4)
#define PRESSURE_BMP085_ADC_OUT_MSB_REG (0xF6)
#define PRESSURE_BMP085_ADC_OUT_LSB_REG (0xF7)
static int bma085_resume(void *mlsl_handle,
struct ext_slave_descr *slave,
struct ext_slave_platform_data *pdata)
{
int result;
unsigned char data[PRESSURE_BMA085_PROM_DATA_LEN];
result =
inv_serial_read(mlsl_handle, pdata->address,
PRESSURE_BMA085_PROM_START_ADDR,
PRESSURE_BMA085_PROM_DATA_LEN, data);
if (result) {
LOG_RESULT_LOCATION(result);
return result;
}
/* parameters AC1-AC6 */
cal_param.ac1 = (data[0] << 8) | data[1];
cal_param.ac2 = (data[2] << 8) | data[3];
cal_param.ac3 = (data[4] << 8) | data[5];
cal_param.ac4 = (data[6] << 8) | data[7];
cal_param.ac5 = (data[8] << 8) | data[9];
cal_param.ac6 = (data[10] << 8) | data[11];
/* parameters B1,B2 */
cal_param.b1 = (data[12] << 8) | data[13];
cal_param.b2 = (data[14] << 8) | data[15];
/* parameters MB,MC,MD */
cal_param.mb = (data[16] << 8) | data[17];
cal_param.mc = (data[18] << 8) | data[19];
cal_param.md = (data[20] << 8) | data[21];
return result;
}
static int bma085_read(void *mlsl_handle,
struct ext_slave_descr *slave,
struct ext_slave_platform_data *pdata,
unsigned char *data)
{
int result;
long pressure, x1, x2, x3, b3, b6;
unsigned long b4, b7;
unsigned long up;
unsigned short ut;
short oversampling_setting = 0;
short temperature;
long divisor;
/* get temprature */
result = inv_serial_single_write(mlsl_handle, pdata->address,
PRESSURE_BMP085_CTRL_MEAS_REG,
PRESSURE_BMP085_T_MEAS);
msleep(5);
result =
inv_serial_read(mlsl_handle, pdata->address,
PRESSURE_BMP085_ADC_OUT_MSB_REG, 2,
(unsigned char *)data);
if (result) {
LOG_RESULT_LOCATION(result);
return result;
}
ut = (data[0] << 8) | data[1];
x1 = (((long) ut - (long)cal_param.ac6) * (long)cal_param.ac5) >> 15;
divisor = x1 + cal_param.md;
if (!divisor)
return INV_ERROR_DIVIDE_BY_ZERO;
x2 = ((long)cal_param.mc << 11) / (x1 + cal_param.md);
cal_param.param_b5 = x1 + x2;
/* temperature in 0.1 degree C */
temperature = (short)((cal_param.param_b5 + 8) >> 4);
/* get pressure */
result = inv_serial_single_write(mlsl_handle, pdata->address,
PRESSURE_BMP085_CTRL_MEAS_REG,
PRESSURE_BMP085_P_MEAS_OSS_0);
msleep(5);
result =
inv_serial_read(mlsl_handle, pdata->address,
PRESSURE_BMP085_ADC_OUT_MSB_REG, 2,
(unsigned char *)data);
if (result) {
LOG_RESULT_LOCATION(result);
return result;
}
up = (((unsigned long) data[0] << 8) | ((unsigned long) data[1]));
b6 = cal_param.param_b5 - 4000;
/* calculate B3 */
x1 = (b6*b6) >> 12;
x1 *= cal_param.b2;
x1 >>= 11;
x2 = (cal_param.ac2*b6);
x2 >>= 11;
x3 = x1 + x2;
b3 = (((((long)cal_param.ac1) * 4 + x3)
<< oversampling_setting) + 2) >> 2;
/* calculate B4 */
x1 = (cal_param.ac3 * b6) >> 13;
x2 = (cal_param.b1 * ((b6*b6) >> 12)) >> 16;
x3 = ((x1 + x2) + 2) >> 2;
b4 = (cal_param.ac4 * (unsigned long) (x3 + 32768)) >> 15;
if (!b4)
return INV_ERROR;
b7 = ((unsigned long)(up - b3) * (50000>>oversampling_setting));
if (b7 < 0x80000000)
pressure = (b7 << 1) / b4;
else
pressure = (b7 / b4) << 1;
x1 = pressure >> 8;
x1 *= x1;
x1 = (x1 * PRESSURE_BMA085_PARAM_MG) >> 16;
x2 = (pressure * PRESSURE_BMA085_PARAM_MH) >> 16;
/* pressure in Pa */
pressure += (x1 + x2 + PRESSURE_BMA085_PARAM_MI) >> 4;
data[0] = (unsigned char)(pressure >> 16);
data[1] = (unsigned char)(pressure >> 8);
data[2] = (unsigned char)(pressure & 0xFF);
return result;
}
static struct ext_slave_descr bma085_descr = {
.init = NULL,
.exit = NULL,
.suspend = bma085_suspend,
.resume = bma085_resume,
.read = bma085_read,
.config = NULL,
.get_config = NULL,
.name = "bma085",
.type = EXT_SLAVE_TYPE_PRESSURE,
.id = PRESSURE_ID_BMA085,
.read_reg = 0xF6,
.read_len = 3,
.endian = EXT_SLAVE_BIG_ENDIAN,
.range = {0, 0},
};
static
struct ext_slave_descr *bma085_get_slave_descr(void)
{
return &bma085_descr;
}
/* Platform data for the MPU */
struct bma085_mod_private_data {
struct i2c_client *client;
struct ext_slave_platform_data *pdata;
};
static unsigned short normal_i2c[] = { I2C_CLIENT_END };
static int bma085_mod_probe(struct i2c_client *client,
const struct i2c_device_id *devid)
{
struct ext_slave_platform_data *pdata;
struct bma085_mod_private_data *private_data;
int result = 0;
dev_info(&client->adapter->dev, "%s: %s\n", __func__, devid->name);
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
result = -ENODEV;
goto out_no_free;
}
pdata = client->dev.platform_data;
if (!pdata) {
dev_err(&client->adapter->dev,
"Missing platform data for slave %s\n", devid->name);
result = -EFAULT;
goto out_no_free;
}
private_data = kzalloc(sizeof(*private_data), GFP_KERNEL);
if (!private_data) {
result = -ENOMEM;
goto out_no_free;
}
i2c_set_clientdata(client, private_data);
private_data->client = client;
private_data->pdata = pdata;
result = inv_mpu_register_slave(THIS_MODULE, client, pdata,
bma085_get_slave_descr);
if (result) {
dev_err(&client->adapter->dev,
"Slave registration failed: %s, %d\n",
devid->name, result);
goto out_free_memory;
}
return result;
out_free_memory:
kfree(private_data);
out_no_free:
dev_err(&client->adapter->dev, "%s failed %d\n", __func__, result);
return result;
}
static int bma085_mod_remove(struct i2c_client *client)
{
struct bma085_mod_private_data *private_data =
i2c_get_clientdata(client);
dev_dbg(&client->adapter->dev, "%s\n", __func__);
inv_mpu_unregister_slave(client, private_data->pdata,
bma085_get_slave_descr);
kfree(private_data);
return 0;
}
static const struct i2c_device_id bma085_mod_id[] = {
{ "bma085", PRESSURE_ID_BMA085 },
{}
};
MODULE_DEVICE_TABLE(i2c, bma085_mod_id);
static struct i2c_driver bma085_mod_driver = {
.class = I2C_CLASS_HWMON,
.probe = bma085_mod_probe,
.remove = bma085_mod_remove,
.id_table = bma085_mod_id,
.driver = {
.owner = THIS_MODULE,
.name = "bma085_mod",
},
.address_list = normal_i2c,
};
static int __init bma085_mod_init(void)
{
int res = i2c_add_driver(&bma085_mod_driver);
pr_info("%s: Probe name %s\n", __func__, "bma085_mod");
if (res)
pr_err("%s failed\n", __func__);
return res;
}
static void __exit bma085_mod_exit(void)
{
pr_info("%s\n", __func__);
i2c_del_driver(&bma085_mod_driver);
}
module_init(bma085_mod_init);
module_exit(bma085_mod_exit);
MODULE_AUTHOR("Invensense Corporation");
MODULE_DESCRIPTION("Driver to integrate BMA085 sensor with the MPU");
MODULE_LICENSE("GPL");
MODULE_ALIAS("bma085_mod");
/**
* @}
**/
