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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 <rocky.hsiao@dyna-image.com> Reviewed-on: https://chromium-review.googlesource.com/356874 Reviewed-by: Gwendal Grignou <gwendal@chromium.org> Reviewed-by: Thomas Lin <thomas.lin@dyna-image.com>
50 lines
903 B
C
50 lines
903 B
C
/* Copyright 2015 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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* Dyna-Image AL3010 light sensor driver
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*/
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#include "driver/als_al3010.h"
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#include "i2c.h"
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/**
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* Initialise AL3010 light sensor.
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*/
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int al3010_init(void)
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{
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int ret;
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ret = i2c_write8(I2C_PORT_ALS, AL3010_I2C_ADDR,
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AL3010_REG_CONFIG, AL3010_GAIN << 4);
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if (ret)
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return ret;
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return i2c_write8(I2C_PORT_ALS, AL3010_I2C_ADDR,
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AL3010_REG_SYSTEM, AL3010_ENABLE);
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}
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/**
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* Read AL3010 light sensor data.
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*/
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int al3010_read_lux(int *lux, int af)
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{
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int ret;
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int val;
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long long val64;
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ret = i2c_read16(I2C_PORT_ALS, AL3010_I2C_ADDR,
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AL3010_REG_DATA_LOW, &val);
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if (ret)
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return ret;
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val64 = val;
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val64 = (val64 * AL3010_GAIN_SCALE) / 10000;
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val = val64 * af / 100;
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*lux = val;
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return EC_SUCCESS;
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}
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