92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
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/* Copyright 2017 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Rohm BH1730 Ambient light sensor driver
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*/
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#ifndef __CROS_EC_ALS_BH1730_H
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#define __CROS_EC_ALS_BH1730_H
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/* I2C interface */
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#define BH1730_I2C_ADDR_FLAGS 0x29
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/* BH1730 registers */
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#define BH1730_CONTROL 0x80
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#define BH1730_TIMING 0x81
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#define BH1730_INTERRUPT 0x82
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#define BH1730_THLLOW 0x83
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#define BH1730_THLHIGH 0x84
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#define BH1730_THHLOW 0x85
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#define BH1730_THHHIGH 0x86
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#define BH1730_GAIN 0x87
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#define BH1730_OPART_ID 0x92
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#define BH1730_DATA0LOW 0x94
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#define BH1730_DATA0HIGH 0x95
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#define BH1730_DATA1LOW 0x96
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#define BH1730_DATA1HIGH 0x97
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/* Software reset */
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#define BH1730_RESET 0xE4
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/* Registers bits */
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#define BH1730_CONTROL_ADC_INTR_INACTIVE (0x00 << 5)
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#define BH1730_CONTROL_ADC_INTR_ACTIVE (0x01 << 5)
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#define BH1730_CONTROL_ADC_VALID (0x01 << 4)
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#define BH1730_CONTROL_ONE_TIME_CONTINOUS (0x00 << 3)
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#define BH1730_CONTROL_ONE_TIME_ONETIME (0x01 << 3)
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#define BH1730_CONTROL_DATA_SEL_TYPE0_AND_1 (0x00 << 2)
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#define BH1730_CONTROL_DATA_SEL_TYPE0 (0x01 << 2)
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#define BH1730_CONTROL_ADC_EN_DISABLE (0x00 << 1)
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#define BH1730_CONTROL_ADC_EN_ENABLE (0x01 << 1)
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#define BH1730_CONTROL_POWER_DISABLE (0x00 << 0)
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#define BH1730_CONTROL_POWER_ENABLE (0x01 << 0)
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#define BH1730_GAIN_GAIN_X1_GAIN (0x00 << 0)
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#define BH1730_GAIN_GAIN_X2_GAIN (0x01 << 0)
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#define BH1730_GAIN_GAIN_X64_GAIN (0x02 << 0)
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#define BH1730_GAIN_GAIN_X128_GAIN (0x03 << 0)
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/* Sensor configuration */
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/* Select Gain */
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#define BH1730_CONF_GAIN BH1730_GAIN_GAIN_X64_GAIN
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#define BH1730_GAIN_DIV 64
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/* Select Itime, 0xDA is 102.6ms = 38*2.7ms */
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#define BH1730_CONF_ITIME 0xDA
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#define ITIME_MS_X_10 ((256 - BH1730_CONF_ITIME) * 27)
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#define ITIME_MS_X_1K (ITIME_MS_X_10*100)
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/* default Itime is about 10Hz */
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#define BH1730_10000_MHZ (10*1000)
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/*
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* Use default lux calculation formula parameters if board specific
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* parameters are not defined.
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*/
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#ifndef CONFIG_ALS_BH1730_LUXTH_PARAMS
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#define BH1730_LUXTH1_1K 260
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#define BH1730_LUXTH1_D0_1K 1290
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#define BH1730_LUXTH1_D1_1K 2733
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#define BH1730_LUXTH2_1K 550
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#define BH1730_LUXTH2_D0_1K 797
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#define BH1730_LUXTH2_D1_1K 859
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#define BH1730_LUXTH3_1K 1090
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#define BH1730_LUXTH3_D0_1K 510
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#define BH1730_LUXTH3_D1_1K 345
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#define BH1730_LUXTH4_1K 2130
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#define BH1730_LUXTH4_D0_1K 276
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#define BH1730_LUXTH4_D1_1K 130
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#endif
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#define BH1730_GET_DATA(_s) ((struct bh1730_drv_data_t *)(_s)->drv_data)
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struct bh1730_drv_data_t {
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int rate;
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int last_value;
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};
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extern const struct accelgyro_drv bh1730_drv;
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#endif /* __CROS_EC_ALS_BH1730_H */
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