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/*
* Copyright (c) 2020 The ZMK Contributors
*
* SPDX-License-Identifier: MIT
*/
#include <zephyr/device.h>
#include <zephyr/devicetree.h>
#include <zephyr/init.h>
#include <zephyr/kernel.h>
#include <zephyr/drivers/sensor.h>
#include <zephyr/bluetooth/services/bas.h>
#include <zephyr/logging/log.h>
LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
#include <zmk/event_manager.h>
#include <zmk/battery.h>
#include <zmk/events/battery_state_changed.h>
#include <zmk/events/activity_state_changed.h>
#include <zmk/activity.h>
#include <zmk/workqueue.h>
static uint8_t last_state_of_charge = 0;
uint8_t zmk_battery_state_of_charge(void) { return last_state_of_charge; }
#if DT_HAS_CHOSEN(zmk_battery)
static const struct device *const battery = DEVICE_DT_GET(DT_CHOSEN(zmk_battery));
#else
#warning \
"Using a node labeled BATTERY for the battery sensor is deprecated. Set a zmk,battery chosen node instead. (Ignore this if you don't have a battery sensor.)"
static const struct device *battery;
#endif
#if IS_ENABLED(CONFIG_ZMK_BATTERY_REPORTING_FETCH_MODE_LITHIUM_VOLTAGE)
static uint8_t lithium_ion_mv_to_pct(int16_t bat_mv) {
// Simple linear approximation of a battery based off adafruit's discharge graph:
// https://learn.adafruit.com/li-ion-and-lipoly-batteries/voltages
if (bat_mv >= 4200) {
return 100;
} else if (bat_mv <= 3450) {
return 0;
}
return bat_mv * 2 / 15 - 459;
}
#endif // IS_ENABLED(CONFIG_ZMK_BATTERY_REPORTING_FETCH_MODE_LITHIUM_VOLTAGE)
static int zmk_battery_update(const struct device *battery) {
struct sensor_value state_of_charge;
int rc;
#if IS_ENABLED(CONFIG_ZMK_BATTERY_REPORTING_FETCH_MODE_STATE_OF_CHARGE)
rc = sensor_sample_fetch_chan(battery, SENSOR_CHAN_GAUGE_STATE_OF_CHARGE);
if (rc != 0) {
LOG_DBG("Failed to fetch battery values: %d", rc);
return rc;
}
rc = sensor_channel_get(battery, SENSOR_CHAN_GAUGE_STATE_OF_CHARGE, &state_of_charge);
if (rc != 0) {
LOG_DBG("Failed to get battery state of charge: %d", rc);
return rc;
}
#elif IS_ENABLED(CONFIG_ZMK_BATTERY_REPORTING_FETCH_MODE_LITHIUM_VOLTAGE)
rc = sensor_sample_fetch_chan(battery, SENSOR_CHAN_VOLTAGE);
if (rc != 0) {
LOG_DBG("Failed to fetch battery values: %d", rc);
return rc;
}
struct sensor_value voltage;
rc = sensor_channel_get(battery, SENSOR_CHAN_VOLTAGE, &voltage);
if (rc != 0) {
LOG_DBG("Failed to get battery voltage: %d", rc);
return rc;
}
uint16_t mv = voltage.val1 * 1000 + (voltage.val2 / 1000);
state_of_charge.val1 = lithium_ion_mv_to_pct(mv);
LOG_DBG("State of change %d from %d mv", state_of_charge.val1, mv);
#else
#error "Not a supported reporting fetch mode"
#endif
if (last_state_of_charge != state_of_charge.val1) {
last_state_of_charge = state_of_charge.val1;
#if IS_ENABLED(CONFIG_BT_BAS)
LOG_DBG("Setting BAS GATT battery level to %d.", last_state_of_charge);
rc = bt_bas_set_battery_level(last_state_of_charge);
if (rc != 0) {
LOG_WRN("Failed to set BAS GATT battery level (err %d)", rc);
return rc;
}
#endif
rc = raise_zmk_battery_state_changed(
(struct zmk_battery_state_changed){.state_of_charge = last_state_of_charge});
}
return rc;
}
static void zmk_battery_work(struct k_work *work) {
int rc = zmk_battery_update(battery);
if (rc != 0) {
LOG_DBG("Failed to update battery value: %d.", rc);
}
}
K_WORK_DEFINE(battery_work, zmk_battery_work);
static void zmk_battery_timer(struct k_timer *timer) {
k_work_submit_to_queue(zmk_workqueue_lowprio_work_q(), &battery_work);
}
K_TIMER_DEFINE(battery_timer, zmk_battery_timer, NULL);
static void zmk_battery_start_reporting() {
if (device_is_ready(battery)) {
k_timer_start(&battery_timer, K_NO_WAIT, K_SECONDS(CONFIG_ZMK_BATTERY_REPORT_INTERVAL));
}
}
static int zmk_battery_init(void) {
#if !DT_HAS_CHOSEN(zmk_battery)
battery = device_get_binding("BATTERY");
if (battery == NULL) {
return -ENODEV;
}
LOG_WRN("Finding battery device labeled BATTERY is deprecated. Use zmk,battery chosen node.");
#endif
if (!device_is_ready(battery)) {
LOG_ERR("Battery device \"%s\" is not ready", battery->name);
return -ENODEV;
}
zmk_battery_start_reporting();
return 0;
}
static int battery_event_listener(const zmk_event_t *eh) {
if (as_zmk_activity_state_changed(eh)) {
switch (zmk_activity_get_state()) {
case ZMK_ACTIVITY_ACTIVE:
zmk_battery_start_reporting();
return 0;
case ZMK_ACTIVITY_IDLE:
case ZMK_ACTIVITY_SLEEP:
k_timer_stop(&battery_timer);
return 0;
default:
break;
}
}
return -ENOTSUP;
}
ZMK_LISTENER(battery, battery_event_listener);
ZMK_SUBSCRIPTION(battery, zmk_activity_state_changed);
SYS_INIT(zmk_battery_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);
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