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