mirror of
https://github.com/CTCaer/hekate.git
synced 2024-11-23 02:16:41 +00:00
117 lines
3.8 KiB
C
117 lines
3.8 KiB
C
/*
|
|
* Ambient light sensor driver for Nintendo Switch's Rohm BH1730
|
|
*
|
|
* Copyright (c) 2018 CTCaer
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope 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/>.
|
|
*/
|
|
|
|
#include "als.h"
|
|
#include <power/max77620.h>
|
|
#include <soc/clock.h>
|
|
#include <soc/i2c.h>
|
|
#include <soc/pinmux.h>
|
|
#include <utils/util.h>
|
|
|
|
#define HOS_GAIN BH1730_GAIN_64X
|
|
#define HOS_ITIME 38
|
|
|
|
void set_als_cfg(als_table_t *als_val, u8 gain, u8 itime)
|
|
{
|
|
i2c_send_byte(I2C_2, BH1730_I2C_ADDR, BH1730_ADDR(BH1730_GAIN_REG), gain);
|
|
i2c_send_byte(I2C_2, BH1730_I2C_ADDR, BH1730_ADDR(BH1730_TIMING_REG), (256 - itime));
|
|
|
|
als_val->gain = gain;
|
|
als_val->itime = itime;
|
|
}
|
|
|
|
void get_als_lux(als_table_t *als_val)
|
|
{
|
|
u32 data[2];
|
|
float pre_gain_lux;
|
|
float visible_light;
|
|
float ir_light;
|
|
float light_ratio;
|
|
|
|
u8 adc_ready = 0;
|
|
u8 retries = 100;
|
|
|
|
const float als_gain_idx_tbl[4] = { 1.0, 2.0, 64.0, 128.0 };
|
|
const float als_norm_res = 100.0;
|
|
const float als_multiplier = 3.6;
|
|
const float als_tint = 2.7;
|
|
|
|
// Wait for ADC to prepare new data.
|
|
while (!(adc_ready & BH1730_CTL_ADC_VALID) && retries)
|
|
{
|
|
retries--;
|
|
adc_ready = i2c_recv_byte(I2C_2, BH1730_I2C_ADDR, BH1730_ADDR(BH1730_CONTROL_REG));
|
|
}
|
|
|
|
// Get visible and ir light raw data.
|
|
data[0] = i2c_recv_byte(I2C_2, BH1730_I2C_ADDR, BH1730_ADDR(BH1730_DATA0LOW_REG)) +
|
|
(i2c_recv_byte(I2C_2, BH1730_I2C_ADDR, BH1730_ADDR(BH1730_DATA0HIGH_REG)) << 8);
|
|
data[1] = i2c_recv_byte(I2C_2, BH1730_I2C_ADDR, BH1730_ADDR(BH1730_DATA1LOW_REG)) +
|
|
(i2c_recv_byte(I2C_2, BH1730_I2C_ADDR, BH1730_ADDR(BH1730_DATA1HIGH_REG)) << 8);
|
|
|
|
als_val->over_limit = data[0] > 65534 || data[1] > 65534;
|
|
als_val->vi_light = data[0];
|
|
als_val->ir_light = data[1];
|
|
|
|
if (!data[0] || !retries)
|
|
{
|
|
als_val->lux = 0.0;
|
|
|
|
return;
|
|
}
|
|
|
|
visible_light = (float)data[0];
|
|
ir_light = (float)data[1];
|
|
light_ratio = (float)data[1] / (float)data[0];
|
|
|
|
// The following are specific to the light filter Switch uses.
|
|
if (light_ratio < 0.5)
|
|
pre_gain_lux = visible_light * 5.002 - ir_light * 7.502;
|
|
else if (light_ratio < 0.754)
|
|
pre_gain_lux = visible_light * 2.250 - ir_light * 2.000;
|
|
else if (light_ratio < 1.029)
|
|
pre_gain_lux = visible_light * 1.999 - ir_light * 1.667;
|
|
else if (light_ratio < 1.373)
|
|
pre_gain_lux = visible_light * 0.884 - ir_light * 0.583;
|
|
else if (light_ratio < 1.879)
|
|
pre_gain_lux = visible_light * 0.309 - ir_light * 0.165;
|
|
else pre_gain_lux = 0.0;
|
|
|
|
als_val->lux = (pre_gain_lux / als_gain_idx_tbl[als_val->gain]) * (als_norm_res / ((float)als_val->itime * als_tint)) * als_multiplier;
|
|
}
|
|
|
|
u8 als_init(als_table_t *als_val)
|
|
{
|
|
pinmux_config_i2c(I2C_2);
|
|
clock_enable_i2c(I2C_2);
|
|
i2c_init(I2C_2);
|
|
|
|
max77620_regulator_set_volt_and_flags(REGULATOR_LDO6, 2900000, MAX77620_POWER_MODE_NORMAL);
|
|
i2c_send_byte(I2C_5, MAX77620_I2C_ADDR, MAX77620_REG_LDO6_CFG2, 0xD8 | MAX77620_LDO_CFG2_ADE_MASK);
|
|
|
|
u8 id = i2c_recv_byte(I2C_2, BH1730_I2C_ADDR, BH1730_ADDR(0x12));
|
|
i2c_send_byte(I2C_2, BH1730_I2C_ADDR, BH1730_SPEC(BH1730_SPECCMD_RESET), 0);
|
|
i2c_send_byte(I2C_2, BH1730_I2C_ADDR, BH1730_ADDR(BH1730_GAIN_REG), HOS_GAIN);
|
|
i2c_send_byte(I2C_2, BH1730_I2C_ADDR, BH1730_ADDR(BH1730_TIMING_REG), (256 - HOS_ITIME));
|
|
i2c_send_byte(I2C_2, BH1730_I2C_ADDR, BH1730_ADDR(BH1730_CONTROL_REG), BH1730_CTL_POWER_ON | BH1730_CTL_ADC_EN);
|
|
|
|
als_val->gain = HOS_GAIN;
|
|
als_val->itime = HOS_ITIME;
|
|
|
|
return id;
|
|
}
|