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/* Copyright 2017 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.
*
* Rohm BH1730 Ambient light sensor driver
*/
#include "accelgyro.h"
#include "config.h"
#include "console.h"
#include "driver/als_bh1730.h"
#include "i2c.h"
#define CPRINTS(format, args...) cprints(CC_MOTION_SENSE, format, ## args)
#define CPRINTF(format, args...) cprintf(CC_MOTION_SENSE, format, ## args)
/**
* Convert BH1730 data0, data1 to lux
*/
static int bh1730_convert_to_lux(uint32_t data0_1)
{
int lux;
uint16_t data0 = 0x0000ffff & data0_1;
uint16_t data1 = data0_1 >> 16;
uint32_t d0_1k = data0 * 1000;
uint32_t d1_1k = data1 * 1000;
uint32_t d_temp = d1_1k / d0_1k;
uint32_t d_lux;
if (data0 == 0)
return 0;
if(d_temp < BH1730_LUXTH1_1K) {
d0_1k = BH1730_LUXTH1_D0_1K * data0;
d1_1k = BH1730_LUXTH1_D1_1K * data1;
} else if(d_temp < BH1730_LUXTH2_1K) {
d0_1k = BH1730_LUXTH2_D0_1K * data0;
d1_1k = BH1730_LUXTH2_D1_1K * data1;
} else if(d_temp < BH1730_LUXTH3_1K) {
d0_1k = BH1730_LUXTH3_D0_1K * data0;
d1_1k = BH1730_LUXTH3_D1_1K * data1;
} else if(d_temp < BH1730_LUXTH4_1K) {
d0_1k = BH1730_LUXTH4_D0_1K * data0;
d1_1k = BH1730_LUXTH4_D1_1K * data1;
} else
return 0;
d_lux = (d0_1k - d1_1k) / BH1730_GAIN_DIV;
d_lux *= 100;
lux = d_lux / ITIME_MS_X_1K;
return lux;
}
/**
* Read BH1730 light sensor data.
*/
static int bh1730_read_lux(const struct motion_sensor_t *s, intv3_t v)
{
struct bh1730_drv_data_t *drv_data = BH1730_GET_DATA(s);
int ret;
int data0_1;
/* read data0 and data1 from sensor */
ret = i2c_read32(s->port, s->addr, BH1730_DATA0LOW, &data0_1);
if (ret != EC_SUCCESS) {
CPRINTF("bh1730_read_lux - fail %d\n", ret);
return ret;
}
/* convert sensor data0 and data1 to lux */
v[0] = bh1730_convert_to_lux(data0_1);
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;
else
return EC_SUCCESS;
}
static int bh1730_set_range(const struct motion_sensor_t *s, int range,
int rnd)
{
return EC_SUCCESS;
}
static int bh1730_get_range(const struct motion_sensor_t *s)
{
return 1;
}
static int bh1730_set_data_rate(const struct motion_sensor_t *s,
int rate, int roundup)
{
struct bh1730_drv_data_t *drv_data = BH1730_GET_DATA(s);
/* now only one rate supported */
drv_data->rate = BH1730_10000_MHZ;
return EC_SUCCESS;
}
static int bh1730_get_data_rate(const struct motion_sensor_t *s)
{
struct bh1730_drv_data_t *drv_data = BH1730_GET_DATA(s);
return drv_data->rate;
}
static int bh1730_set_offset(const struct motion_sensor_t *s,
const int16_t *offset,
int16_t temp)
{
return EC_SUCCESS;
}
static int bh1730_get_offset(const struct motion_sensor_t *s,
int16_t *offset,
int16_t *temp)
{
*offset = 0;
return EC_SUCCESS;
}
/**
* Initialise BH1730 Ambient light sensor.
*/
static int bh1730_init(const struct motion_sensor_t *s)
{
int ret;
/* power and measurement bit high */
ret = i2c_write8(s->port, s->addr,
BH1730_CONTROL,
BH1730_CONTROL_POWER_ENABLE|BH1730_CONTROL_ADC_EN_ENABLE);
if (ret != EC_SUCCESS) {
CPRINTF("bh1730_init_sensor - enable fail %d\n", ret);
return ret;
}
/* set timing */
ret = i2c_write8(s->port, s->addr, BH1730_TIMING, BH1730_CONF_ITIME);
if (ret != EC_SUCCESS) {
CPRINTF("bh1730_init_sensor - time fail %d\n", ret);
return ret;
}
/* set ADC gain */
ret = i2c_write8(s->port, s->addr, BH1730_GAIN, BH1730_CONF_GAIN);
if (ret != EC_SUCCESS) {
CPRINTF("bh1730_init_sensor - gain fail %d\n", ret);
return ret;
}
return sensor_init_done(s);
}
const struct accelgyro_drv bh1730_drv = {
.init = bh1730_init,
.read = bh1730_read_lux,
.set_range = bh1730_set_range,
.get_range = bh1730_get_range,
.set_offset = bh1730_set_offset,
.get_offset = bh1730_get_offset,
.set_data_rate = bh1730_set_data_rate,
.get_data_rate = bh1730_get_data_rate,
};
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