Remove `bluefruit_le_read_battery_voltage` function (#25129)

builddefs/common_features.mk

···
 
     ifeq ($(strip $(BLUETOOTH_DRIVER)), bluefruit_le)
         SPI_DRIVER_REQUIRED = yes
-        ANALOG_DRIVER_REQUIRED = yes
         SRC += $(DRIVER_PATH)/bluetooth/bluetooth.c
         SRC += $(DRIVER_PATH)/bluetooth/bluefruit_le.cpp
     endif

drivers/bluetooth/bluefruit_le.cpp

···
 #    define BLUEFRUIT_LE_SCK_DIVISOR 2 // 4MHz SCK/8MHz CPU, calculated for Feather 32U4 BLE
 #endif
 
-#define SAMPLE_BATTERY
 #define ConnectionUpdateInterval 1000 /* milliseconds */
-
-#ifndef BATTERY_LEVEL_PIN
-#    define BATTERY_LEVEL_PIN B5
-#endif
 
 static struct {
     bool is_connected;
···
 #define UsingEvents 2
     bool event_flags;
 
-#ifdef SAMPLE_BATTERY
-    uint16_t last_battery_update;
-    uint32_t vbat;
-#endif
     uint16_t last_connection_update;
 } state;
 
···
             set_connected(atoi(resbuf));
         }
     }
-
-#ifdef SAMPLE_BATTERY
-    if (timer_elapsed(state.last_battery_update) > BatteryUpdateInterval && resp_buf.empty()) {
-        state.last_battery_update = timer_read();
-
-        state.vbat = analogReadPin(BATTERY_LEVEL_PIN);
-    }
-#endif
 }
 
 static bool process_queue_item(struct queue_item *item, uint16_t timeout) {
···
     while (!send_buf.enqueue(item)) {
         send_buf_send_one();
     }
-}
-
-uint32_t bluefruit_le_read_battery_voltage(void) {
-    return state.vbat;
 }
 
 bool bluefruit_le_set_mode_leds(bool on) {

drivers/bluetooth/bluefruit_le.h

···
  * change. */
 extern void bluefruit_le_send_mouse(report_mouse_t *report);
 
-/* Compute battery voltage by reading an analog pin.
- * Returns the integer number of millivolts */
-extern uint32_t bluefruit_le_read_battery_voltage(void);
-
 extern bool bluefruit_le_set_mode_leds(bool on);
 extern bool bluefruit_le_set_power_level(int8_t level);
 

keyboards/handwired/promethium/config.h

···
 //#define NO_ACTION_ONESHOT
 
 #define PS2_MOUSE_INIT_DELAY 2000
-#define BATTERY_POLL         30000
-#define MAX_VOLTAGE          4.2
-#define MIN_VOLTAGE          3.2
+
+#define BATTERY_PIN B5
 
 #ifndef __ASSEMBLER__  // assembler doesn't like enum in .h file
 enum led_sequence {

keyboards/handwired/promethium/promethium.c

···
-#include "promethium.h"
-#include "analog.h"
+#include "keyboard.h"
 #include "timer.h"
-#include "matrix.h"
-#include "bluefruit_le.h"
+#include "battery.h"
 
-// cubic fit {3.3, 0}, {3.5, 2.9}, {3.6, 5}, {3.7, 8.6}, {3.8, 36},  {3.9, 62}, {4.0, 73}, {4.05, 83}, {4.1, 89}, {4.15, 94}, {4.2, 100}
+#ifndef BATTERY_POLL
+#    define BATTERY_POLL 30000
+#endif
 
 uint8_t battery_level(void) {
-    float voltage = bluefruit_le_read_battery_voltage() * 2 * 3.3 / 1024;
-    if (voltage < MIN_VOLTAGE) return 0;
-    if (voltage > MAX_VOLTAGE) return 255;
-    return (voltage - MIN_VOLTAGE) / (MAX_VOLTAGE - MIN_VOLTAGE) * 255;
+    // maintain legacy behaviour and scale 0-100 percent to 0-255
+    uint16_t percent = battery_get_percent();
+    return  (percent * 255) / 100;
 }
 
 __attribute__ ((weak))

keyboards/handwired/promethium/rules.mk

···
 CUSTOM_MATRIX = yes
 
 WS2812_DRIVER_REQUIRED = yes
-ANALOG_DRIVER_REQUIRED = yes
+BATTERY_DRIVER_REQUIRED = yes
 
 SRC += rgbsps.c
 SRC += matrix.c

keyboards/matrix/falcon/config.h

···
 //pin setting
 #define LED_POWER_PIN       D5
 #define CHG_EN_PIN          E6
-#define BATTERY_LEVEL_PIN   F0

keyboards/tokyokeyboard/alix40/config.h

···
-/*
-Copyright 2021 quadcube <[e-mail]>
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#pragma once
-
-/* Bluetooth */
-#define BATTERY_LEVEL_PIN   B6