mirror of
https://github.com/Telecominfraproject/OpenCellular.git
synced 2026-01-08 00:21:46 +00:00
229094b245
BUG=none
TEST=Manually tested on Kunimitsu & Strago.
Removed the ALS sensor from DUT, using "taskinfo" console command
observed that the ALS task is not running.
BRANCH=none
Change-Id: I96cb720bd8d70033d433cdc2cd9cea9b56a3b389
Signed-off-by: Vijay Hiremath <vijay.p.hiremath@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/301753
Commit-Ready: Vijay P Hiremath <vijay.p.hiremath@intel.com>
Tested-by: Vijay P Hiremath <vijay.p.hiremath@intel.com>
Reviewed-by: Shawn N <shawnn@chromium.org>
90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
/* 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.
|
||
*
|
||
* TI OPT3001 light sensor driver
|
||
*/
|
||
|
||
#include "driver/als_opt3001.h"
|
||
#include "i2c.h"
|
||
|
||
/**
|
||
* Read register from OPT3001 light sensor.
|
||
*/
|
||
static int opt3001_i2c_read(const int reg, int *data_ptr)
|
||
{
|
||
int ret;
|
||
|
||
ret = i2c_read16(I2C_PORT_ALS, OPT3001_I2C_ADDR, reg, data_ptr);
|
||
if (!ret)
|
||
*data_ptr = ((*data_ptr << 8) & 0xFF00) |
|
||
((*data_ptr >> 8) & 0x00FF);
|
||
|
||
return ret;
|
||
}
|
||
|
||
/**
|
||
* Write register to OPT3001 light sensor.
|
||
*/
|
||
static int opt3001_i2c_write(const int reg, int data)
|
||
{
|
||
int ret;
|
||
|
||
data = ((data << 8) & 0xFF00) | ((data >> 8) & 0x00FF);
|
||
ret = i2c_write16(I2C_PORT_ALS, OPT3001_I2C_ADDR, reg, data);
|
||
|
||
return ret;
|
||
}
|
||
|
||
/**
|
||
* Initialise OPT3001 light sensor.
|
||
*/
|
||
int opt3001_init(void)
|
||
{
|
||
int data;
|
||
int ret;
|
||
|
||
ret = opt3001_i2c_read(OPT3001_REG_MAN_ID, &data);
|
||
if (ret || data != OPT3001_MANUFACTURER_ID)
|
||
return ret;
|
||
|
||
ret = opt3001_i2c_read(OPT3001_REG_DEV_ID, &data);
|
||
if (ret || data != OPT3001_DEVICE_ID)
|
||
return ret;
|
||
|
||
/*
|
||
* [15:12]: 0101b Automatic full scale (1310.40lux, 0.32lux/lsb)
|
||
* [11] : 1b Conversion time 800ms
|
||
* [10:9] : 10b Continuous Mode of conversion operation
|
||
* [4] : 1b Latched window-style comparison operation
|
||
*/
|
||
return opt3001_i2c_write(OPT3001_REG_CONFIGURE, 0x5C10);
|
||
}
|
||
|
||
/**
|
||
* Read OPT3001 light sensor data.
|
||
*/
|
||
int opt3001_read_lux(int *lux, int af)
|
||
{
|
||
int ret;
|
||
int data;
|
||
|
||
ret = opt3001_i2c_read(OPT3001_REG_RESULT, &data);
|
||
if (ret)
|
||
return ret;
|
||
|
||
/*
|
||
* The default power-on values will give 12 bits of precision:
|
||
* 0x0000-0x0fff indicates 0 to 1310.40 lux. We multiply the sensor
|
||
* value by a scaling factor to account for attenuation by glass,
|
||
* tinting, etc.
|
||
*/
|
||
|
||
/*
|
||
* lux = 2EXP[3:0] × R[11:0] / 100
|
||
*/
|
||
*lux = (1 << ((data & 0xF000) >> 12)) * (data & 0x0FFF) * af / 100;
|
||
|
||
return EC_SUCCESS;
|
||
}
|