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https://github.com/Telecominfraproject/OpenCellular.git
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f9272713da
Added i2ctest console command to test the reliability of the I2C.
By reading/writing to the known registers this tests provides the
number of successful read and writes.
BUG=chrome-os-partner:57487
TEST=Enabled the i2ctest config on Reef and tested the
i2c read/writes.
BRANCH=none
Change-Id: I9e27ff96f2b85422933bc590d112a083990e2dfb
Signed-off-by: Vijay Hiremath <vijay.p.hiremath@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/290427
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>
102 lines
2.3 KiB
C
102 lines
2.3 KiB
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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* TI OPT3001 light sensor driver
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*/
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#include "driver/als_opt3001.h"
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#include "i2c.h"
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/**
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* Read register from OPT3001 light sensor.
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*/
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static int opt3001_i2c_read(const int reg, int *data_ptr)
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{
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int ret;
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ret = i2c_read16(I2C_PORT_ALS, OPT3001_I2C_ADDR, reg, data_ptr);
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if (!ret)
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*data_ptr = ((*data_ptr << 8) & 0xFF00) |
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((*data_ptr >> 8) & 0x00FF);
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return ret;
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}
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/**
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* Write register to OPT3001 light sensor.
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*/
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static int opt3001_i2c_write(const int reg, int data)
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{
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data = ((data << 8) & 0xFF00) | ((data >> 8) & 0x00FF);
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return i2c_write16(I2C_PORT_ALS, OPT3001_I2C_ADDR, reg, data);
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}
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/**
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* Initialise OPT3001 light sensor.
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*/
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int opt3001_init(void)
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{
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int data;
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int ret;
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ret = opt3001_i2c_read(OPT3001_REG_MAN_ID, &data);
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if (ret)
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return ret;
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if (data != OPT3001_MANUFACTURER_ID)
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return EC_ERROR_UNKNOWN;
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ret = opt3001_i2c_read(OPT3001_REG_DEV_ID, &data);
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if (ret)
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return ret;
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if (data != OPT3001_DEVICE_ID)
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return EC_ERROR_UNKNOWN;
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/*
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* [15:12]: 0101b Automatic full scale (1310.40lux, 0.32lux/lsb)
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* [11] : 1b Conversion time 800ms
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* [10:9] : 10b Continuous Mode of conversion operation
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* [4] : 1b Latched window-style comparison operation
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*/
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return opt3001_i2c_write(OPT3001_REG_CONFIGURE, 0x5C10);
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}
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/**
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* Read OPT3001 light sensor data.
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*/
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int opt3001_read_lux(int *lux, int af)
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{
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int ret;
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int data;
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ret = opt3001_i2c_read(OPT3001_REG_RESULT, &data);
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if (ret)
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return ret;
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/*
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* The default power-on values will give 12 bits of precision:
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* 0x0000-0x0fff indicates 0 to 1310.40 lux. We multiply the sensor
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* value by a scaling factor to account for attenuation by glass,
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* tinting, etc.
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*/
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/*
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* lux = 2EXP[3:0] × R[11:0] / 100
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*/
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*lux = (1 << ((data & 0xF000) >> 12)) * (data & 0x0FFF) * af / 100;
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return EC_SUCCESS;
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}
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#ifdef CONFIG_CMD_I2C_STRESS_TEST_ALS
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struct i2c_stress_test_dev opt3001_i2c_stress_test_dev = {
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.reg_info = {
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.read_reg = OPT3001_REG_DEV_ID,
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.read_val = OPT3001_DEVICE_ID,
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.write_reg = OPT3001_REG_INT_LIMIT_LSB,
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},
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.i2c_read_dev = &opt3001_i2c_read,
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.i2c_write_dev = &opt3001_i2c_write,
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};
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#endif /* CONFIG_CMD_I2C_STRESS_TEST_ALS */
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