blob: d56471843b65e3f460f2ab406d7d29ce1a67058a [file] [log] [blame]
/*
* Copyright (c) 2017 Phytec Messtechnik GmbH
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <string.h>
#include <device.h>
#include <i2c.h>
#include <gpio.h>
#include <misc/byteorder.h>
#include <misc/util.h>
#include <kernel.h>
#include <sensor.h>
#include <misc/__assert.h>
#include "amg88xx.h"
static int amg88xx_sample_fetch(struct device *dev, enum sensor_channel chan)
{
struct amg88xx_data *drv_data = dev->driver_data;
__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL || chan == SENSOR_CHAN_TEMP);
if (i2c_burst_read(drv_data->i2c, CONFIG_AMG88XX_I2C_ADDR,
AMG88XX_OUTPUT_BASE,
(u8_t *)drv_data->sample,
sizeof(drv_data->sample))) {
return -EIO;
}
return 0;
}
static int amg88xx_channel_get(struct device *dev,
enum sensor_channel chan,
struct sensor_value *val)
{
struct amg88xx_data *drv_data = dev->driver_data;
size_t len = ARRAY_SIZE(drv_data->sample);
if (chan != SENSOR_CHAN_TEMP) {
return -ENOTSUP;
}
for (size_t idx = 0; idx < len; idx++) {
/* fix negative values */
if (drv_data->sample[idx] & (1 << 11)) {
drv_data->sample[idx] |= 0xF000;
}
val[idx].val1 = (((s32_t)drv_data->sample[idx]) *
AMG88XX_TREG_LSB_SCALING) / 1000000;
val[idx].val2 = (((s32_t)drv_data->sample[idx]) *
AMG88XX_TREG_LSB_SCALING) % 1000000;
}
return 0;
}
static int amg88xx_init_device(struct device *dev)
{
struct amg88xx_data *drv_data = dev->driver_data;
u8_t tmp;
if (amg88xx_reg_read(drv_data, AMG88XX_PCLT, &tmp)) {
SYS_LOG_ERR("Failed to read Power mode");
return -EIO;
}
SYS_LOG_DBG("Power mode 0x%02x", tmp);
if (tmp != AMG88XX_PCLT_NORMAL_MODE) {
if (amg88xx_reg_write(drv_data, AMG88XX_PCLT,
AMG88XX_PCLT_NORMAL_MODE)) {
return -EIO;
}
k_busy_wait(AMG88XX_WAIT_MODE_CHANGE_US);
}
if (amg88xx_reg_write(drv_data, AMG88XX_RST,
AMG88XX_RST_INITIAL_RST)) {
return -EIO;
}
k_busy_wait(AMG88XX_WAIT_INITIAL_RESET_US);
if (amg88xx_reg_write(drv_data, AMG88XX_FPSC, AMG88XX_FPSC_10FPS)) {
return -EIO;
}
SYS_LOG_DBG("");
return 0;
}
int amg88xx_init(struct device *dev)
{
struct amg88xx_data *drv_data = dev->driver_data;
drv_data->i2c = device_get_binding(CONFIG_AMG88XX_I2C_MASTER_DEV_NAME);
if (drv_data->i2c == NULL) {
SYS_LOG_ERR("Failed to get pointer to %s device!",
CONFIG_AMG88XX_I2C_MASTER_DEV_NAME);
return -EINVAL;
}
if (amg88xx_init_device(dev) < 0) {
SYS_LOG_ERR("Failed to initialize device!");
return -EIO;
}
#ifdef CONFIG_AMG88XX_TRIGGER
if (amg88xx_init_interrupt(dev) < 0) {
SYS_LOG_ERR("Failed to initialize interrupt!");
return -EIO;
}
#endif
return 0;
}
struct amg88xx_data amg88xx_driver;
static const struct sensor_driver_api amg88xx_driver_api = {
#ifdef CONFIG_AMG88XX_TRIGGER
.attr_set = amg88xx_attr_set,
.trigger_set = amg88xx_trigger_set,
#endif
.sample_fetch = amg88xx_sample_fetch,
.channel_get = amg88xx_channel_get,
};
DEVICE_AND_API_INIT(amg88xx, CONFIG_AMG88XX_NAME, amg88xx_init,
&amg88xx_driver, NULL,
POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY,
&amg88xx_driver_api);