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driver: add support ambient light sensor AL3010

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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>
This commit is contained in:
Rocky Hsiao
2016-06-24 11:48:27 +08:00
committed by chrome-bot
parent b275061eec
commit d8166a8d65
4 changed files with 91 additions and 0 deletions
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49
driver/als_al3010.c Normal file
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@@ -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;
}

40
driver/als_al3010.h Normal file
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@@ -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 */

1
driver/build.mk
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@@ -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

1
include/config.h
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@@ -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, */