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/* Copyright (c) 2016 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/**
* Commons acc/gyro function for ST sensors in Chrome EC
*/
#include "stm_mems_common.h"
/**
* Read single register
*/
inline int raw_read8(const int port, const int addr, const int reg,
int *data_ptr)
{
/* TODO: Implement SPI interface support */
return i2c_read8(port, addr, reg, data_ptr);
}
/**
* Write single register
*/
inline int raw_write8(const int port, const int addr, const int reg,
int data)
{
/* TODO: Implement SPI interface support */
return i2c_write8(port, addr, reg, data);
}
/**
* Read n bytes for read
* NOTE: Some chip use MSB for auto-increments in SUB address
* MSB must be set for autoincrement in multi read when auto_inc
* is set
*/
int raw_read_n(const int port, const int addr, const uint8_t reg,
uint8_t *data_ptr, const int len, int auto_inc)
{
int rv = -EC_ERROR_PARAM1;
uint8_t reg_a = reg;
if (auto_inc)
reg_a |= AUTO_INC;
/* TODO: Implement SPI interface support */
i2c_lock(port, 1);
rv = i2c_xfer(port, addr, ®_a, 1, data_ptr, len, I2C_XFER_SINGLE);
i2c_lock(port, 0);
return rv;
}
/**
* write_data_with_mask - Write register with mask
* @s: Motion sensor pointer
* @reg: Device register
* @mask: The mask to search
* @data: Data pointer
*/
int write_data_with_mask(const struct motion_sensor_t *s, int reg,
uint8_t mask, uint8_t data)
{
int err;
int new_data = 0x00, old_data = 0x00;
err = raw_read8(s->port, s->addr, reg, &old_data);
if (err != EC_SUCCESS)
return err;
new_data = ((old_data & (~mask)) | ((data << __builtin_ctz(mask)) & mask));
if (new_data == old_data)
return EC_SUCCESS;
return raw_write8(s->port, s->addr, reg, new_data);
}
/**
* set_resolution - Set bit resolution
* @s: Motion sensor pointer
* @res: Bit resolution
* @rnd: Round bit
*
* TODO: must support multiple resolution
*/
int set_resolution(const struct motion_sensor_t *s, int res, int rnd)
{
return EC_SUCCESS;
}
/**
* get_resolution - Get bit resolution
* @s: Motion sensor pointer
*
* TODO: must support multiple resolution
*/
int get_resolution(const struct motion_sensor_t *s)
{
struct stprivate_data *data = s->drv_data;
return data->resol;
}
/**
* set_offset - Set data offset
* @s: Motion sensor pointer
* @offset: offset vector
* @temp: Temp
*/
int set_offset(const struct motion_sensor_t *s,
const int16_t *offset, int16_t temp)
{
struct stprivate_data *data = s->drv_data;
data->offset[X] = offset[X];
data->offset[Y] = offset[Y];
data->offset[Z] = offset[Z];
return EC_SUCCESS;
}
/**
* get_offset - Get data offset
* @s: Motion sensor pointer
* @offset: offset vector
* @temp: Temp
*/
int get_offset(const struct motion_sensor_t *s,
int16_t *offset, int16_t *temp)
{
struct stprivate_data *data = s->drv_data;
offset[X] = data->offset[X];
offset[Y] = data->offset[Y];
offset[Z] = data->offset[Z];
*temp = EC_MOTION_SENSE_INVALID_CALIB_TEMP;
return EC_SUCCESS;
}
/**
* get_data_rate - Get data rate (ODR)
* @s: Motion sensor pointer
*/
int get_data_rate(const struct motion_sensor_t *s)
{
struct stprivate_data *data = s->drv_data;
return data->base.odr;
}
/**
* normalize - Apply LSB data sens. and rotation based on sensor resolution
* @s: Motion sensor pointer
* @v: output vector
* @data: LSB raw data
*/
void normalize(const struct motion_sensor_t *s, vector_3_t v, uint8_t *data)
{
int i;
struct stprivate_data *drvdata = s->drv_data;
/* Adjust data to sensor Sensitivity and Precision:
* - devices with 16 bits resolution has gain in ug/LSB
* - devices with 8/10 bits resolution has gain in mg/LSB
*/
for (i = 0; i < 3; i++) {
switch (drvdata->resol) {
case 10:
v[i] = ((int16_t)((data[i * 2 + 1] << 8) |
data[i * 2]) >> 6);
v[i] = v[i] * drvdata->base.range;
break;
case 16:
v[i] = ((int16_t)(data[i * 2 + 1] << 8) |
data[i * 2]);
v[i] = (v[i] * drvdata->base.range) / 1000;
break;
}
}
rotate(v, *s->rot_standard_ref, v);
}
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