refactor(split): Clean up Kconfig organization.

* Seperated configs for split role (central/peripheral)
  and transport (BLE only for now).
* Split the configs to align on structure.

app/src/ble.c

@@ -47,7 +47,7 @@ static uint8_t passkey_digit = 0;
 
 #endif /* IS_ENABLED(CONFIG_ZMK_BLE_PASSKEY_ENTRY) */
 
-#if IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL)
+#if IS_ENABLED(CONFIG_ZMK_SPLIT_ROLE_CENTRAL)
 #define PROFILE_COUNT (CONFIG_BT_MAX_PAIRED - 1)
 #else
 #define PROFILE_COUNT CONFIG_BT_MAX_PAIRED
@@ -82,11 +82,11 @@ static const struct bt_data zmk_ble_ad[] = {
                   ),
 };
 
-#if IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL)
+#if IS_ENABLED(CONFIG_ZMK_SPLIT_ROLE_CENTRAL)
 
 static bt_addr_le_t peripheral_addr;
 
-#endif /* IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL) */
+#endif /* IS_ENABLED(CONFIG_ZMK_SPLIT_ROLE_CENTRAL) */
 
 static void raise_profile_changed_event() {
     ZMK_EVENT_RAISE(new_zmk_ble_active_profile_changed((struct zmk_ble_active_profile_changed){
@@ -278,14 +278,14 @@ bt_addr_le_t *zmk_ble_active_profile_addr() { return &profiles[active_profile].p
 
 char *zmk_ble_active_profile_name() { return profiles[active_profile].name; }
 
-#if IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL)
+#if IS_ENABLED(CONFIG_ZMK_SPLIT_ROLE_CENTRAL)
 
 void zmk_ble_set_peripheral_addr(bt_addr_le_t *addr) {
     memcpy(&peripheral_addr, addr, sizeof(bt_addr_le_t));
     settings_save_one("ble/peripheral_address", addr, sizeof(bt_addr_le_t));
 }
 
-#endif /* IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL) */
+#endif /* IS_ENABLED(CONFIG_ZMK_SPLIT_ROLE_CENTRAL) */
 
 #if IS_ENABLED(CONFIG_SETTINGS)
 
@@ -336,7 +336,7 @@ static int ble_profiles_handle_set(const char *name, size_t len, settings_read_c
             return err;
         }
     }
-#if IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL)
+#if IS_ENABLED(CONFIG_ZMK_SPLIT_ROLE_CENTRAL)
     else if (settings_name_steq(name, "peripheral_address", &next) && !next) {
         if (len != sizeof(bt_addr_le_t)) {
             return -EINVAL;

app/src/display/widgets/Kconfig

@@ -6,7 +6,7 @@ menu "ZMK Display Widgets"
 config ZMK_WIDGET_LAYER_STATUS
     bool "Widget for highest, active layer using small icons"
     default y
-    depends on !ZMK_SPLIT || ZMK_SPLIT_BLE_ROLE_CENTRAL
+    depends on !ZMK_SPLIT || ZMK_SPLIT_ROLE_CENTRAL
     select LVGL_USE_LABEL
 
 config ZMK_WIDGET_BATTERY_STATUS
@@ -17,19 +17,19 @@ config ZMK_WIDGET_BATTERY_STATUS
 
 config ZMK_WIDGET_OUTPUT_STATUS
     bool "Widget for keyboard output status icons"
-    depends on BT && (!ZMK_SPLIT_BLE || ZMK_SPLIT_BLE_ROLE_CENTRAL)
-    default y if BT && (!ZMK_SPLIT_BLE || ZMK_SPLIT_BLE_ROLE_CENTRAL)
+    depends on BT && (!ZMK_SPLIT_BLE || ZMK_SPLIT_ROLE_CENTRAL)
+    default y if BT && (!ZMK_SPLIT_BLE || ZMK_SPLIT_ROLE_CENTRAL)
     select LVGL_USE_LABEL
 
 config ZMK_WIDGET_PERIPHERAL_STATUS
     bool "Widget for split peripheral status icons"
-    depends on BT && ZMK_SPLIT_BLE && !ZMK_SPLIT_BLE_ROLE_CENTRAL
-    default y if BT && ZMK_SPLIT_BLE && !ZMK_SPLIT_BLE_ROLE_CENTRAL
+    depends on BT && ZMK_SPLIT_BLE && !ZMK_SPLIT_ROLE_CENTRAL
+    default y if BT && ZMK_SPLIT_BLE && !ZMK_SPLIT_ROLE_CENTRAL
     select LVGL_USE_LABEL
     
 config ZMK_WIDGET_WPM_STATUS
     bool "Widget for displaying typed words per minute"
-    depends on !ZMK_SPLIT || ZMK_SPLIT_BLE_ROLE_CENTRAL
+    depends on !ZMK_SPLIT || ZMK_SPLIT_ROLE_CENTRAL
     select LVGL_USE_LABEL
     select ZMK_WPM
 

app/src/split/Kconfig

@@ -0,0 +1,26 @@
+# Copyright (c) 2022 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+menuconfig ZMK_SPLIT
+	bool "Split keyboard support"
+
+if ZMK_SPLIT
+
+config ZMK_SPLIT_ROLE_CENTRAL
+	bool "Split central device"
+
+choice ZMK_SPLIT_TRANSPORT
+	prompt "Split transport"
+
+config ZMK_SPLIT_BLE
+	bool "BLE"
+	depends on ZMK_BLE
+	select BT_USER_PHY_UPDATE
+	select BT_AUTO_PHY_UPDATE
+
+endchoice
+
+#ZMK_SPLIT
+endif
+
+rsource "bluetooth/Kconfig"

app/src/split/bluetooth/Kconfig

@@ -0,0 +1,95 @@
+# Copyright (c) 2022 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+if ZMK_SPLIT && ZMK_SPLIT_BLE
+
+menu "BLE Transport"
+
+# Added for backwards compatibility. New shields/board should set `ZMK_SPLIT_ROLE_CENTRAL` only.
+config ZMK_SPLIT_BLE_ROLE_CENTRAL
+	bool
+	select ZMK_SPLIT_ROLE_CENTRAL
+
+config ZMK_SPLIT_ROLE_CENTRAL
+	select BT_CENTRAL
+	select BT_GATT_CLIENT
+	select BT_GATT_AUTO_DISCOVER_CCC
+
+if ZMK_SPLIT_ROLE_CENTRAL
+
+config ZMK_SPLIT_BLE_CENTRAL_POSITION_QUEUE_SIZE
+	int "Max number of key position state events to queue when received from peripherals"
+	default 5
+
+config ZMK_BLE_SPLIT_CENTRAL_SPLIT_RUN_STACK_SIZE
+	int "BLE split central write thread stack size"
+	default 512
+
+config ZMK_BLE_SPLIT_CENTRAL_SPLIT_RUN_QUEUE_SIZE
+	int "Max number of behavior run events to queue to send to the peripheral(s)"
+	default 5
+
+endif # ZMK_SPLIT_ROLE_CENTRAL
+
+if !ZMK_SPLIT_ROLE_CENTRAL
+
+config ZMK_SPLIT_BLE_PERIPHERAL_STACK_SIZE
+	int "BLE split peripheral notify thread stack size"
+	default 650
+
+config ZMK_SPLIT_BLE_PERIPHERAL_PRIORITY
+	int "BLE split peripheral notify thread priority"
+	default 5
+
+config ZMK_SPLIT_BLE_PERIPHERAL_POSITION_QUEUE_SIZE
+	int "Max number of key position state events to queue to send to the central"
+	default 10
+
+config ZMK_USB
+	default n
+
+config BT_MAX_PAIRED
+	default 1
+
+config BT_MAX_CONN
+	default 1
+
+config BT_PERIPHERAL_PREF_MAX_INT
+	default 6
+
+#!ZMK_SPLIT_ROLE_CENTRAL
+endif
+
+endmenu
+
+#ZMK_SPLIT_BLE
+endif
+
+
+if ZMK_BLE
+
+if ZMK_SPLIT_BLE && ZMK_SPLIT_ROLE_CENTRAL
+
+config BT_MAX_CONN
+	default 6
+
+config BT_MAX_PAIRED
+	default 6
+
+#ZMK_SPLIT_BLE && ZMK_SPLIT_ROLE_CENTRAL
+endif
+
+if !ZMK_SPLIT_BLE
+
+config BT_MAX_CONN
+	default 5
+
+config BT_MAX_PAIRED
+	default 5
+
+#!ZMK_SPLIT_BLE
+endif
+
+#ZMK_BLE
+endif
+