Refactor battery driver (#25550)

quantum/battery/battery.c

@@ -0,0 +1,41 @@
+// Copyright 2025 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "battery_driver.h"
+#include "battery.h"
+#include "timer.h"
+
+#ifndef BATTERY_SAMPLE_INTERVAL
+#    define BATTERY_SAMPLE_INTERVAL 30000
+#endif
+
+static uint8_t last_bat_level = 100;
+
+void battery_init(void) {
+    battery_driver_init();
+
+    last_bat_level = battery_driver_sample_percent();
+}
+
+__attribute__((weak)) void battery_percent_changed_user(uint8_t level) {}
+__attribute__((weak)) void battery_percent_changed_kb(uint8_t level) {}
+
+static void handle_percent_changed(void) {
+    battery_percent_changed_user(last_bat_level);
+    battery_percent_changed_kb(last_bat_level);
+}
+
+void battery_task(void) {
+    static uint32_t bat_timer = 0;
+    if (timer_elapsed32(bat_timer) > BATTERY_SAMPLE_INTERVAL) {
+        last_bat_level = battery_driver_sample_percent();
+
+        handle_percent_changed();
+
+        bat_timer = timer_read32();
+    }
+}
+
+uint8_t battery_get_percent(void) {
+    return last_bat_level;
+}