From d8166a8d65bc776ad2484ac49cd4d7a218b48d7c Mon Sep 17 00:00:00 2001 From: Rocky Hsiao Date: Fri, 24 Jun 2016 11:48:27 +0800 Subject: driver: add support ambient light sensor AL3010 AL3010 is Dyna-Image ambient light sensor. Here is add basic driver and functions. BUG=chrome-os-partner:52915 BRANCH=elm TEST=Flash on base board "glados" with ASUS al3010_init is return success. al3010_read_lux is return the lux success. Change-Id: Ie3b97d0889b150c43d19bc84d84f04c13e415c31 Signed-off-by: Rocky Hsiao Reviewed-on: https://chromium-review.googlesource.com/356874 Reviewed-by: Gwendal Grignou Reviewed-by: Thomas Lin --- driver/als_al3010.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ driver/als_al3010.h | 40 ++++++++++++++++++++++++++++++++++++++++ driver/build.mk | 1 + include/config.h | 1 + 4 files changed, 91 insertions(+) create mode 100644 driver/als_al3010.c create mode 100644 driver/als_al3010.h diff --git a/driver/als_al3010.c b/driver/als_al3010.c new file mode 100644 index 0000000000..b129dc2f57 --- /dev/null +++ b/driver/als_al3010.c @@ -0,0 +1,49 @@ +/* Copyright 2015 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. + * + * Dyna-Image AL3010 light sensor driver + */ + +#include "driver/als_al3010.h" +#include "i2c.h" + +/** + * Initialise AL3010 light sensor. + */ +int al3010_init(void) +{ + int ret; + + ret = i2c_write8(I2C_PORT_ALS, AL3010_I2C_ADDR, + AL3010_REG_CONFIG, AL3010_GAIN << 4); + if (ret) + return ret; + + return i2c_write8(I2C_PORT_ALS, AL3010_I2C_ADDR, + AL3010_REG_SYSTEM, AL3010_ENABLE); +} + +/** + * Read AL3010 light sensor data. + */ +int al3010_read_lux(int *lux, int af) +{ + int ret; + int val; + long long val64; + + ret = i2c_read16(I2C_PORT_ALS, AL3010_I2C_ADDR, + AL3010_REG_DATA_LOW, &val); + + if (ret) + return ret; + + val64 = val; + val64 = (val64 * AL3010_GAIN_SCALE) / 10000; + val = val64 * af / 100; + + *lux = val; + + return EC_SUCCESS; +} diff --git a/driver/als_al3010.h b/driver/als_al3010.h new file mode 100644 index 0000000000..eb06762883 --- /dev/null +++ b/driver/als_al3010.h @@ -0,0 +1,40 @@ +/* Copyright 2015 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. + * + * Dyna-Image AL3010 light sensor driver + */ + +#ifndef __CROS_EC_ALS_AL3010_H +#define __CROS_EC_ALS_AL3010_H + +/* I2C interface */ +#define AL3010_I2C_ADDR1 (0x1C << 1) +#define AL3010_I2C_ADDR2 (0x1D << 1) +#define AL3010_I2C_ADDR3 (0x1E << 1) + +/* AL3010 registers */ +#define AL3010_REG_SYSTEM 0x00 +#define AL3010_REG_INT_STATUS 0x01 +#define AL3010_REG_CONFIG 0x10 +#define AL3010_REG_DATA_LOW 0x0C + +#define AL3010_ENABLE 0x01 +#define AL3010_GAIN_SELECT 3 + +#define AL3010_GAIN_1 0 /* 77806 lx */ +#define AL3010_GAIN_2 1 /* 19452 lx */ +#define AL3010_GAIN_3 2 /* 4863 lx */ +#define AL3010_GAIN_4 3 /* 1216 lx */ +#define AL3010_GAIN CONCAT2(AL3010_GAIN_, AL3010_GAIN_SELECT) + +#define AL3010_GAIN_SCALE_1 11872 /* 1.1872 lux/count */ +#define AL3010_GAIN_SCALE_2 2968 /* 0.2968 lux/count */ +#define AL3010_GAIN_SCALE_3 742 /* 0.0742 lux/count */ +#define AL3010_GAIN_SCALE_4 186 /* 0.0186 lux/count */ +#define AL3010_GAIN_SCALE CONCAT2(AL3010_GAIN_SCALE_, AL3010_GAIN_SELECT) + +int al3010_init(void); +int al3010_read_lux(int *lux, int af); + +#endif /* __CROS_EC_ALS_AL3010_H */ diff --git a/driver/build.mk b/driver/build.mk index 514de8cc50..09d2552b19 100644 --- a/driver/build.mk +++ b/driver/build.mk @@ -18,6 +18,7 @@ driver-$(CONFIG_MAG_BMI160_BMM150)+=mag_bmm150.o driver-$(CONFIG_GYRO_L3GD20H)+=gyro_l3gd20h.o # ALS drivers +driver-$(CONFIG_ALS_AL3010)+=als_al3010.o driver-$(CONFIG_ALS_ISL29035)+=als_isl29035.o driver-$(CONFIG_ALS_OPT3001)+=als_opt3001.o driver-$(CONFIG_ALS_SI114X)+=als_si114x.o diff --git a/include/config.h b/include/config.h index 72ea36dc8c..abbb0bc10b 100644 --- a/include/config.h +++ b/include/config.h @@ -111,6 +111,7 @@ * specific drivers for each module. */ #undef CONFIG_ALS +#undef CONFIG_ALS_AL3010 #undef CONFIG_ALS_ISL29035 #undef CONFIG_ALS_OPT3001 /* Define the exact model ID present on the board: SI1141 = 41, SI1142 = 42, */ -- cgit v1.2.1