157 lines
4.2 KiB
C
157 lines
4.2 KiB
C
/* sensor_isl29035.c - driver for ISL29035 light sensor */
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/*
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* Copyright (c) 2016 Intel Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <kernel.h>
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#include <init.h>
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#include <i2c.h>
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#include <sensor.h>
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#include <misc/__assert.h>
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#include "isl29035.h"
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static int isl29035_sample_fetch(struct device *dev, enum sensor_channel chan)
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{
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struct isl29035_driver_data *drv_data = dev->driver_data;
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uint8_t msb, lsb;
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__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL);
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if (i2c_reg_read_byte(drv_data->i2c, ISL29035_I2C_ADDRESS,
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ISL29035_DATA_MSB_REG, &msb) < 0) {
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return -EIO;
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}
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if (i2c_reg_read_byte(drv_data->i2c, ISL29035_I2C_ADDRESS,
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ISL29035_DATA_LSB_REG, &lsb) < 0) {
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return -EIO;
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}
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drv_data->data_sample = (msb << 8) + lsb;
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return 0;
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}
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static int isl29035_channel_get(struct device *dev,
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enum sensor_channel chan,
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struct sensor_value *val)
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{
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struct isl29035_driver_data *drv_data = dev->driver_data;
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uint64_t tmp;
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#if CONFIG_ISL29035_MODE_ALS
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/* val = sample_val * lux_range / (2 ^ adc_data_bits) */
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tmp = (uint64_t)drv_data->data_sample * ISL29035_LUX_RANGE;
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val->type = SENSOR_VALUE_TYPE_INT_PLUS_MICRO;
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val->val1 = tmp >> ISL29035_ADC_DATA_BITS;
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tmp = (tmp & ISL29035_ADC_DATA_MASK) * 1000000;
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val->val2 = tmp >> ISL29035_ADC_DATA_BITS;
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#elif CONFIG_ISL29035_MODE_IR
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ARG_UNUSED(tmp);
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val->type = SENSOR_VALUE_TYPE_INT_INT_PLUS_MICRO;
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val->val1 = drv_data->data_sample;
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val->val2 = 0;
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#endif
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return 0;
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}
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static const struct sensor_driver_api isl29035_api = {
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#if CONFIG_ISL29035_TRIGGER
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.attr_set = &isl29035_attr_set,
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.trigger_set = &isl29035_trigger_set,
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#endif
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.sample_fetch = &isl29035_sample_fetch,
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.channel_get = &isl29035_channel_get,
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};
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static int isl29035_init(struct device *dev)
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{
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struct isl29035_driver_data *drv_data = dev->driver_data;
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drv_data->i2c = device_get_binding(CONFIG_ISL29035_I2C_MASTER_DEV_NAME);
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if (drv_data->i2c == NULL) {
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SYS_LOG_DBG("Failed to get I2C device.");
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return -EINVAL;
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}
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drv_data->data_sample = 0;
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/* clear blownout status bit */
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if (i2c_reg_update_byte(drv_data->i2c, ISL29035_I2C_ADDRESS,
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ISL29035_ID_REG, ISL29035_BOUT_MASK, 0) < 0) {
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SYS_LOG_DBG("Failed to clear blownout status bit.");
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return -EIO;
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}
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/* set command registers to set default attributes */
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if (i2c_reg_write_byte(drv_data->i2c, ISL29035_I2C_ADDRESS,
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ISL29035_COMMAND_I_REG, 0) < 0) {
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SYS_LOG_DBG("Failed to clear COMMAND-I.");
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return -EIO;
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}
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if (i2c_reg_write_byte(drv_data->i2c, ISL29035_I2C_ADDRESS,
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ISL29035_COMMAND_II_REG, 0) < 0) {
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SYS_LOG_DBG("Failed to clear COMMAND-II.");
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return -EIO;
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}
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/* set operation mode */
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if (i2c_reg_update_byte(drv_data->i2c, ISL29035_I2C_ADDRESS,
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ISL29035_COMMAND_I_REG,
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ISL29035_OPMODE_MASK,
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ISL29035_ACTIVE_OPMODE_BITS) < 0) {
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SYS_LOG_DBG("Failed to set opmode.");
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return -EIO;
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}
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/* set lux range */
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if (i2c_reg_update_byte(drv_data->i2c, ISL29035_I2C_ADDRESS,
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ISL29035_COMMAND_II_REG,
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ISL29035_LUX_RANGE_MASK,
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ISL29035_LUX_RANGE_BITS) < 0) {
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SYS_LOG_DBG("Failed to set lux range.");
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return -EIO;
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}
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/* set ADC resolution */
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if (i2c_reg_update_byte(drv_data->i2c, ISL29035_I2C_ADDRESS,
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ISL29035_COMMAND_II_REG,
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ISL29035_ADC_RES_MASK,
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ISL29035_ADC_RES_BITS) < 0) {
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SYS_LOG_DBG("Failed to set ADC resolution.");
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return -EIO;
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}
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#ifdef CONFIG_ISL29035_TRIGGER
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if (isl29035_init_interrupt(dev) < 0) {
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SYS_LOG_DBG("Failed to initialize interrupt.");
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return -EIO;
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}
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#endif
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dev->driver_api = &isl29035_api;
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return 0;
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}
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struct isl29035_driver_data isl29035_data;
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DEVICE_INIT(isl29035_dev, CONFIG_ISL29035_NAME, &isl29035_init,
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&isl29035_data, NULL, POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY);
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