138 lines
3.1 KiB
C
138 lines
3.1 KiB
C
/*
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* Copyright (c) 2017 Phytec Messtechnik GmbH
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <string.h>
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#include <device.h>
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#include <i2c.h>
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#include <gpio.h>
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#include <misc/byteorder.h>
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#include <misc/util.h>
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#include <kernel.h>
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#include <sensor.h>
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#include <misc/__assert.h>
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#include "amg88xx.h"
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static int amg88xx_sample_fetch(struct device *dev, enum sensor_channel chan)
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{
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struct amg88xx_data *drv_data = dev->driver_data;
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__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL || chan == SENSOR_CHAN_AMBIENT_TEMP);
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if (i2c_burst_read(drv_data->i2c, CONFIG_AMG88XX_I2C_ADDR,
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AMG88XX_OUTPUT_BASE,
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(u8_t *)drv_data->sample,
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sizeof(drv_data->sample))) {
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return -EIO;
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}
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return 0;
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}
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static int amg88xx_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 amg88xx_data *drv_data = dev->driver_data;
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size_t len = ARRAY_SIZE(drv_data->sample);
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if (chan != SENSOR_CHAN_AMBIENT_TEMP) {
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return -ENOTSUP;
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}
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for (size_t idx = 0; idx < len; idx++) {
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/* fix negative values */
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if (drv_data->sample[idx] & (1 << 11)) {
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drv_data->sample[idx] |= 0xF000;
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}
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val[idx].val1 = (((s32_t)drv_data->sample[idx]) *
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AMG88XX_TREG_LSB_SCALING) / 1000000;
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val[idx].val2 = (((s32_t)drv_data->sample[idx]) *
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AMG88XX_TREG_LSB_SCALING) % 1000000;
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}
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return 0;
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}
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static int amg88xx_init_device(struct device *dev)
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{
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struct amg88xx_data *drv_data = dev->driver_data;
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u8_t tmp;
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if (amg88xx_reg_read(drv_data, AMG88XX_PCLT, &tmp)) {
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SYS_LOG_ERR("Failed to read Power mode");
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return -EIO;
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}
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SYS_LOG_DBG("Power mode 0x%02x", tmp);
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if (tmp != AMG88XX_PCLT_NORMAL_MODE) {
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if (amg88xx_reg_write(drv_data, AMG88XX_PCLT,
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AMG88XX_PCLT_NORMAL_MODE)) {
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return -EIO;
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}
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k_busy_wait(AMG88XX_WAIT_MODE_CHANGE_US);
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}
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if (amg88xx_reg_write(drv_data, AMG88XX_RST,
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AMG88XX_RST_INITIAL_RST)) {
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return -EIO;
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}
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k_busy_wait(AMG88XX_WAIT_INITIAL_RESET_US);
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if (amg88xx_reg_write(drv_data, AMG88XX_FPSC, AMG88XX_FPSC_10FPS)) {
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return -EIO;
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}
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SYS_LOG_DBG("");
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return 0;
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}
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int amg88xx_init(struct device *dev)
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{
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struct amg88xx_data *drv_data = dev->driver_data;
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drv_data->i2c = device_get_binding(CONFIG_AMG88XX_I2C_MASTER_DEV_NAME);
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if (drv_data->i2c == NULL) {
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SYS_LOG_ERR("Failed to get pointer to %s device!",
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CONFIG_AMG88XX_I2C_MASTER_DEV_NAME);
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return -EINVAL;
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}
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if (amg88xx_init_device(dev) < 0) {
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SYS_LOG_ERR("Failed to initialize device!");
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return -EIO;
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}
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#ifdef CONFIG_AMG88XX_TRIGGER
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if (amg88xx_init_interrupt(dev) < 0) {
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SYS_LOG_ERR("Failed to initialize interrupt!");
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return -EIO;
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}
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#endif
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return 0;
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}
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struct amg88xx_data amg88xx_driver;
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static const struct sensor_driver_api amg88xx_driver_api = {
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#ifdef CONFIG_AMG88XX_TRIGGER
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.attr_set = amg88xx_attr_set,
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.trigger_set = amg88xx_trigger_set,
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#endif
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.sample_fetch = amg88xx_sample_fetch,
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.channel_get = amg88xx_channel_get,
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};
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DEVICE_AND_API_INIT(amg88xx, CONFIG_AMG88XX_NAME, amg88xx_init,
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&amg88xx_driver, NULL,
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POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY,
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&amg88xx_driver_api);
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