/* sensor_isl29035.c - trigger support for ISL29035 light sensor */
/*
* Copyright (c) 2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <i2c.h>
#include <misc/util.h>
#include <kernel.h>
#include "isl29035.h"
extern struct isl29035_driver_data isl29035_data;
static uint16_t isl29035_lux_processed_to_raw(struct sensor_value const *val)
{
uint64_t raw_val;
/* raw_val = val * (2 ^ adc_data_bits) / lux_range */
raw_val = (((uint64_t)val->val1) << ISL29035_ADC_DATA_BITS) +
(((uint64_t)val->val2) << ISL29035_ADC_DATA_BITS) / 1000000;
return raw_val / ISL29035_LUX_RANGE;
}
int isl29035_attr_set(struct device *dev,
enum sensor_channel chan,
enum sensor_attribute attr,
const struct sensor_value *val)
{
struct isl29035_driver_data *drv_data = dev->driver_data;
uint8_t lsb_reg, msb_reg;
uint16_t raw_val;
if (attr == SENSOR_ATTR_UPPER_THRESH) {
lsb_reg = ISL29035_INT_HT_LSB_REG;
msb_reg = ISL29035_INT_HT_MSB_REG;
} else if (attr == SENSOR_ATTR_LOWER_THRESH) {
lsb_reg = ISL29035_INT_LT_LSB_REG;
msb_reg = ISL29035_INT_LT_MSB_REG;
} else {
return -ENOTSUP;
}
raw_val = isl29035_lux_processed_to_raw(val);
if (i2c_reg_write_byte(drv_data->i2c, ISL29035_I2C_ADDRESS,
lsb_reg, raw_val & 0xFF) < 0 ||
i2c_reg_write_byte(drv_data->i2c, ISL29035_I2C_ADDRESS,
msb_reg, raw_val >> 8) < 0) {
SYS_LOG_DBG("Failed to set attribute.");
return -EIO;
}
return 0;
}
static void isl29035_gpio_callback(struct device *dev,
struct gpio_callback *cb, uint32_t pins)
{
struct isl29035_driver_data *drv_data =
CONTAINER_OF(cb, struct isl29035_driver_data, gpio_cb);
ARG_UNUSED(pins);
gpio_pin_disable_callback(dev, CONFIG_ISL29035_GPIO_PIN_NUM);
#if defined(CONFIG_ISL29035_TRIGGER_OWN_THREAD)
k_sem_give(&drv_data->gpio_sem);
#elif defined(CONFIG_ISL29035_TRIGGER_GLOBAL_THREAD)
k_work_submit(&drv_data->work);
#endif
}
static void isl29035_thread_cb(struct device *dev)
{
struct isl29035_driver_data *drv_data = dev->driver_data;
uint8_t val;
/* clear interrupt */
i2c_reg_read_byte(drv_data->i2c, ISL29035_I2C_ADDRESS,
ISL29035_COMMAND_I_REG, &val);
if (drv_data->th_handler != NULL) {
drv_data->th_handler(dev, &drv_data->th_trigger);
}
gpio_pin_enable_callback(drv_data->gpio, CONFIG_ISL29035_GPIO_PIN_NUM);
}
#ifdef CONFIG_ISL29035_TRIGGER_OWN_THREAD
static void isl29035_thread(int ptr, int unused)
{
struct device *dev = INT_TO_POINTER(ptr);
struct isl29035_driver_data *drv_data = dev->driver_data;
ARG_UNUSED(unused);
while (1) {
k_sem_take(&drv_data->gpio_sem, K_FOREVER);
isl29035_thread_cb(dev);
}
}
#endif
#ifdef CONFIG_ISL29035_TRIGGER_GLOBAL_THREAD
static void isl29035_work_cb(struct k_work *work)
{
struct isl29035_driver_data *drv_data =
CONTAINER_OF(work, struct isl29035_driver_data, work);
isl29035_thread_cb(drv_data->dev);
}
#endif
int isl29035_trigger_set(struct device *dev,
const struct sensor_trigger *trig,
sensor_trigger_handler_t handler)
{
struct isl29035_driver_data *drv_data = dev->driver_data;
/* disable interrupt callback while changing parameters */
gpio_pin_disable_callback(drv_data->gpio, CONFIG_ISL29035_GPIO_PIN_NUM);
drv_data->th_handler = handler;
drv_data->th_trigger = *trig;
/* enable interrupt callback */
gpio_pin_enable_callback(drv_data->gpio, CONFIG_ISL29035_GPIO_PIN_NUM);
return 0;
}
int isl29035_init_interrupt(struct device *dev)
{
struct isl29035_driver_data *drv_data = dev->driver_data;
/* set interrupt persistence */
if (i2c_reg_update_byte(drv_data->i2c, ISL29035_I2C_ADDRESS,
ISL29035_COMMAND_I_REG,
ISL29035_INT_PRST_MASK,
ISL29035_INT_PRST_BITS) < 0) {
SYS_LOG_DBG("Failed to set interrupt persistence cycles.");
return -EIO;
}
/* setup gpio interrupt */
drv_data->gpio = device_get_binding(CONFIG_ISL29035_GPIO_DEV_NAME);
if (drv_data->gpio == NULL) {
SYS_LOG_DBG("Failed to get GPIO device.");
return -EINVAL;
}
gpio_pin_configure(drv_data->gpio, CONFIG_ISL29035_GPIO_PIN_NUM,
GPIO_DIR_IN | GPIO_INT | GPIO_INT_LEVEL |
GPIO_INT_ACTIVE_LOW | GPIO_INT_DEBOUNCE);
gpio_init_callback(&drv_data->gpio_cb,
isl29035_gpio_callback,
BIT(CONFIG_ISL29035_GPIO_PIN_NUM));
if (gpio_add_callback(drv_data->gpio, &drv_data->gpio_cb) < 0) {
SYS_LOG_DBG("Failed to set gpio callback.");
return -EIO;
}
#if defined(CONFIG_ISL29035_TRIGGER_OWN_THREAD)
k_sem_init(&drv_data->gpio_sem, 0, UINT_MAX);
k_thread_spawn(drv_data->thread_stack, CONFIG_ISL29035_THREAD_STACK_SIZE,
(k_thread_entry_t)isl29035_thread, POINTER_TO_INT(dev),
0, NULL, K_PRIO_COOP(CONFIG_ISL29035_THREAD_PRIORITY), 0, 0);
#elif defined(CONFIG_ISL29035_TRIGGER_GLOBAL_THREAD)
drv_data->work.handler = isl29035_work_cb;
drv_data->dev = dev;
#endif
return 0;
}