Refactor battery driver (#25550)

quantum/battery/battery.h

@@ -0,0 +1,46 @@
+// Copyright 2025 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <stdint.h>
+
+/**
+ * \file
+ *
+ * \defgroup battery Battery API
+ *
+ * \brief API to query battery status.
+ * \{
+ */
+
+/**
+ * \brief Initialize the battery driver.
+ */
+void battery_init(void);
+
+/**
+ * \brief Perform housekeeping tasks.
+ */
+void battery_task(void);
+
+/**
+ * \brief Sample battery level.
+ *
+ * \return The battery percentage, in the range 0-100.
+ */
+uint8_t battery_get_percent(void);
+
+/**
+ * \brief user hook called when battery level changed.
+ *
+ */
+void battery_percent_changed_user(uint8_t level);
+
+/**
+ * \brief keyboard hook called when battery level changed.
+ *
+ */
+void battery_percent_changed_kb(uint8_t level);
+
+/** \} */