Implement Kconfig and enhance error checks

app/boards/arm/bluemicro840/Kconfig.defconfig

@@ -27,4 +27,7 @@ config ZMK_BLE
 config ZMK_USB
 	default y
 
+config ZMK_BATTERY_VOLTAGE_DIVIDER
+	default y
+
 endif # BOARD_BLUEMICRO840_V1

app/boards/arm/bluemicro840/bluemicro840_v1_defconfig

@@ -10,8 +10,6 @@ CONFIG_ARM_MPU=y
 # enable GPIO
 CONFIG_GPIO=y
 
-CONFIG_ADC=y
-
 CONFIG_USE_DT_CODE_PARTITION=y
 
 CONFIG_MPU_ALLOW_FLASH_WRITE=y

app/boards/arm/nice_nano/Kconfig.defconfig

@@ -25,4 +25,7 @@ config ZMK_BLE
 config ZMK_USB
 	default y
 
+config ZMK_BATTERY_VOLTAGE_DIVIDER
+	default y
+
 endif # BOARD_NICE_NANO

app/boards/arm/nice_nano/nice_nano_defconfig

@@ -10,8 +10,6 @@ CONFIG_ARM_MPU=y
 # enable GPIO
 CONFIG_GPIO=y
 
-CONFIG_ADC=y
-
 CONFIG_USE_DT_CODE_PARTITION=y
 
 CONFIG_MPU_ALLOW_FLASH_WRITE=y

app/boards/arm/nrfmicro/Kconfig.defconfig

@@ -35,6 +35,9 @@ if BOARD_NRFMICRO_13
 config BOARD_NRFMICRO_CHARGER
 	default y
 
+config ZMK_BATTERY_VOLTAGE_DIVIDER
+	default y
+
 endif # BOARD_NRFMICRO_13
 
 endif # BOARD_NRFMICRO_11 || BOARD_NRFMICRO_11_FLIPPED || BOARD_NRFMICRO_13

app/boards/arm/nrfmicro/nrfmicro_13_defconfig

@@ -10,8 +10,6 @@ CONFIG_ARM_MPU=y
 # enable GPIO
 CONFIG_GPIO=y
 
-CONFIG_ADC=y
-
 CONFIG_USE_DT_CODE_PARTITION=y
 
 CONFIG_MPU_ALLOW_FLASH_WRITE=y

app/drivers/zephyr/CMakeLists.txt

@@ -5,9 +5,9 @@ if(CONFIG_ZMK_KSCAN_GPIO_DRIVER)
   zephyr_library_sources(
     kscan_gpio_matrix.c
     kscan_gpio_direct.c
-    battery_voltage_divider.c
     )
 
   zephyr_library_sources_ifdef(CONFIG_EC11 ec11.c)
   zephyr_library_sources_ifdef(CONFIG_EC11_TRIGGER ec11_trigger.c)
+  zephyr_library_sources_ifdef(CONFIG_ZMK_BATTERY_VOLTAGE_DIVIDER battery_voltage_divider.c)
 endif()

app/drivers/zephyr/Kconfig

@@ -21,6 +21,12 @@ config ZMK_KSCAN_INIT_PRIORITY
 	help
 	  Keyboard scan device driver initialization priority.
 
+config ZMK_BATTERY_VOLTAGE_DIVIDER
+	bool "ZMK battery voltage divider"
+	select ADC
+	help
+		Enable ZMK battery voltage divider driver for battery monitoring.
+
 menuconfig EC11
 	bool "EC11 Incremental Encoder Sensor"
 	depends on GPIO

app/drivers/zephyr/battery_voltage_divider.c

@@ -14,8 +14,6 @@
 
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
-#if DT_HAS_COMPAT_STATUS_OKAY(DT_DRV_COMPAT)
-
 struct io_channel_config {
     const char *label;
     uint8_t channel;
@@ -102,10 +100,11 @@ static int bvd_sample_fetch(struct device *dev, enum sensor_channel chan) {
 
     // Disable power GPIO if present
     if (drv_data->gpio) {
-        rc = gpio_pin_set(drv_data->gpio, drv_cfg->power_gpios.pin, 0);
+        int rc2 = gpio_pin_set(drv_data->gpio, drv_cfg->power_gpios.pin, 0);
 
-        if (rc != 0) {
-            LOG_DBG("Failed to disable ADC power GPIO: %d", rc);
+        if (rc2 != 0) {
+            LOG_DBG("Failed to disable ADC power GPIO: %d", rc2);
+            return rc2;
         }
     }
 
@@ -214,5 +213,3 @@ static const struct bvd_config bvd_cfg = {
 
 DEVICE_AND_API_INIT(bvd_dev, DT_INST_LABEL(0), &bvd_init, &bvd_data, &bvd_cfg, POST_KERNEL,
                     CONFIG_SENSOR_INIT_PRIORITY, &bvd_api);
-
-#endif /* DT_HAS_COMPAT_STATUS_OKAY(DT_DRV_COMPAT) */