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/* Copyright 2022 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* CAPELLA CM32183 light sensor driver
*/
#include "accelgyro.h"
#include "common.h"
#include "driver/als_cm32183.h"
#include "i2c.h"
#include "math_util.h"
struct cm32183_drv_data {
int rate;
int last_value;
/* the coefficient is scale.uscale */
int16_t scale;
uint16_t uscale;
int16_t offset;
};
#define CM32183_GET_DATA(_s) ((struct cm32183_drv_data *)(_s)->drv_data)
/*
* Read CM32183 light sensor data.
*/
static int cm32183_read_lux(int *lux)
{
int ret;
int data;
ret = i2c_read16(I2C_PORT_SENSOR, CM32183_I2C_ADDR,
CM32183_REG_ALS_RESULT, &data);
if (ret)
return ret;
/*
* lux = data * 0.016
*/
*lux = (data * 16) / 1000;
return EC_SUCCESS;
}
/*
* Read data from CM32183 light sensor, and transfer unit into lux.
*/
static int cm32183_read(const struct motion_sensor_t *s, intv3_t v)
{
struct cm32183_drv_data *drv_data = CM32183_GET_DATA(s);
int ret;
int lux_data;
ret = cm32183_read_lux(&lux_data);
if (ret)
return ret;
lux_data += drv_data->offset;
lux_data = lux_data * drv_data->scale +
lux_data * drv_data->uscale / 10000;
v[0] = lux_data;
v[1] = 0;
v[2] = 0;
/*
* Return an error when nothing change to prevent filling the
* fifo with useless data.
*/
if (v[0] == drv_data->last_value)
return EC_ERROR_UNCHANGED;
drv_data->last_value = v[0];
return EC_SUCCESS;
}
static int cm32183_set_range(struct motion_sensor_t *s, int range, int rnd)
{
return EC_SUCCESS;
}
static int cm32183_set_data_rate(const struct motion_sensor_t *s, int rate,
int roundup)
{
CM32183_GET_DATA(s)->rate = rate;
return EC_SUCCESS;
}
static int cm32183_get_data_rate(const struct motion_sensor_t *s)
{
return CM32183_GET_DATA(s)->rate;
}
static int cm32183_set_offset(const struct motion_sensor_t *s,
const int16_t *offset, int16_t temp)
{
/* TODO: check calibration method */
return EC_SUCCESS;
}
static int cm32183_get_offset(const struct motion_sensor_t *s, int16_t *offset,
int16_t *temp)
{
*offset = CM32183_GET_DATA(s)->offset;
return EC_SUCCESS;
}
/**
* Initialise CM32183 light sensor.
*/
static int cm32183_init(struct motion_sensor_t *s)
{
int ret;
int data;
ret = i2c_write16(s->port, s->i2c_spi_addr_flags, CM32183_REG_CONFIGURE,
CM32183_REG_CONFIGURE_CH_EN);
if (ret)
return ret;
ret = i2c_read16(s->port, s->i2c_spi_addr_flags, CM32183_REG_ALS_RESULT,
&data);
if (ret)
return ret;
return sensor_init_done(s);
}
const struct accelgyro_drv cm32183_drv = {
.init = cm32183_init,
.read = cm32183_read,
.set_range = cm32183_set_range,
.set_offset = cm32183_set_offset,
.get_offset = cm32183_get_offset,
.set_data_rate = cm32183_set_data_rate,
.get_data_rate = cm32183_get_data_rate,
};
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