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/*
* Copyright (c) 2020 The ZMK Contributors
*
* SPDX-License-Identifier: MIT
*/
#include <zephyr/drivers/sensor.h>
#include <zephyr/devicetree.h>
#include <zephyr/init.h>
#include <zephyr/logging/log.h>
LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
#include <zmk/sensors.h>
#include <zmk/event_manager.h>
#include <zmk/events/sensor_event.h>
#if ZMK_KEYMAP_HAS_SENSORS
struct sensors_item_cfg {
const struct zmk_sensor_config *config;
const struct device *dev;
struct sensor_trigger trigger;
uint8_t sensor_index;
};
#define _SENSOR_ITEM(idx, node) \
{.dev = DEVICE_DT_GET_OR_NULL(node), \
.trigger = {.type = SENSOR_TRIG_DATA_READY, .chan = SENSOR_CHAN_ROTATION}, \
.config = &configs[idx], \
.sensor_index = idx}
#define SENSOR_ITEM(idx, _i) _SENSOR_ITEM(idx, ZMK_KEYMAP_SENSORS_BY_IDX(idx))
#define PLUS_ONE(n) +1
#define ZMK_KEYMAP_SENSORS_CHILD_COUNT (0 DT_FOREACH_CHILD(ZMK_KEYMAP_SENSORS_NODE, PLUS_ONE))
#define SENSOR_CHILD_ITEM(node) \
{.triggers_per_rotation = \
DT_PROP_OR(node, triggers_per_rotation, \
DT_PROP_OR(ZMK_KEYMAP_SENSORS_NODE, triggers_per_rotation, \
CONFIG_ZMK_KEYMAP_SENSORS_DEFAULT_TRIGGERS_PER_ROTATION))}
#define SENSOR_CHILD_DEFAULTS(idx, arg) \
{.triggers_per_rotation = DT_PROP_OR(ZMK_KEYMAP_SENSORS_NODE, triggers_per_rotation, \
CONFIG_ZMK_KEYMAP_SENSORS_DEFAULT_TRIGGERS_PER_ROTATION)}
static struct zmk_sensor_config configs[] = {
#if ZMK_KEYMAP_SENSORS_CHILD_COUNT > 0
DT_FOREACH_CHILD_SEP(ZMK_KEYMAP_SENSORS_NODE, SENSOR_CHILD_ITEM, (, ))
#else
LISTIFY(ZMK_KEYMAP_SENSORS_LEN, SENSOR_CHILD_DEFAULTS, (, ), 0)
#endif
};
static struct sensors_item_cfg sensors[] = {LISTIFY(ZMK_KEYMAP_SENSORS_LEN, SENSOR_ITEM, (, ), 0)};
static ATOMIC_DEFINE(pending_sensors, ZMK_KEYMAP_SENSORS_LEN);
const struct zmk_sensor_config *zmk_sensors_get_config_at_index(uint8_t sensor_index) {
if (sensor_index > ARRAY_SIZE(configs)) {
return NULL;
}
return &configs[sensor_index];
}
static void trigger_sensor_data_for_position(uint32_t sensor_index) {
int err;
const struct sensors_item_cfg *item = &sensors[sensor_index];
err = sensor_sample_fetch(item->dev);
if (err) {
LOG_WRN("Failed to fetch sample from device %d", err);
return;
}
struct sensor_value value;
err = sensor_channel_get(item->dev, item->trigger.chan, &value);
if (err) {
LOG_WRN("Failed to get channel data from device %d", err);
return;
}
raise_zmk_sensor_event(
(struct zmk_sensor_event){.sensor_index = item->sensor_index,
.channel_data_size = 1,
.channel_data = {(struct zmk_sensor_channel_data){
.value = value, .channel = item->trigger.chan}},
.timestamp = k_uptime_get()});
}
static void run_sensors_data_trigger(struct k_work *work) {
for (int i = 0; i < ARRAY_SIZE(sensors); i++) {
if (atomic_test_and_clear_bit(pending_sensors, i)) {
trigger_sensor_data_for_position(i);
}
}
}
K_WORK_DEFINE(sensor_data_work, run_sensors_data_trigger);
static void zmk_sensors_trigger_handler(const struct device *dev,
const struct sensor_trigger *trigger) {
const struct sensors_item_cfg *test_item =
CONTAINER_OF(trigger, struct sensors_item_cfg, trigger);
int sensor_index = test_item - sensors;
if (sensor_index < 0 || sensor_index >= ARRAY_SIZE(sensors)) {
LOG_ERR("Invalid sensor item triggered our callback (%d)", sensor_index);
return;
}
if (k_is_in_isr()) {
atomic_set_bit(pending_sensors, sensor_index);
k_work_submit(&sensor_data_work);
} else {
trigger_sensor_data_for_position(sensor_index);
}
}
static void zmk_sensors_init_item(uint8_t i) {
LOG_DBG("Init sensor at index %d", i);
if (!sensors[i].dev) {
LOG_DBG("No local device for %d", i);
return;
}
int err = sensor_trigger_set(sensors[i].dev, &sensors[i].trigger, zmk_sensors_trigger_handler);
if (err) {
LOG_WRN("Failed to set sensor trigger (%d)", err);
}
}
#define SENSOR_INIT(idx, _t) zmk_sensors_init_item(idx);
static int zmk_sensors_init(void) {
LISTIFY(ZMK_KEYMAP_SENSORS_LEN, SENSOR_INIT, (), 0)
return 0;
}
SYS_INIT(zmk_sensors_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);
#endif /* ZMK_KEYMAP_HAS_SENSORS */
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