ARM split - Add bootmagic/magic keycodes for setting handedness (#6545)

* Add docs on bootmagic/magic keycodes for setting handedness

* Clang format fixes

* Maintain backwards compatibility

* Maintain backwards compatibility

7 files changed, 44 insertions, 5 deletions

diff --git a/quantum/quantum.c b/quantum/quantum.c
index 82c7a5265b..09452ed4ef 100644
--- a/quantum/quantum.c
+++ b/quantum/quantum.c
@@ -534,7 +534,7 @@ bool process_record_quantum(keyrecord_t *record) {
 #    endif
 #endif
         case MAGIC_SWAP_CONTROL_CAPSLOCK ... MAGIC_TOGGLE_ALT_GUI:
-        case MAGIC_SWAP_LCTL_LGUI ... MAGIC_TOGGLE_CTL_GUI:
+        case MAGIC_SWAP_LCTL_LGUI ... MAGIC_EE_HANDS_RIGHT:
             if (record->event.pressed) {
                 // MAGIC actions (BOOTMAGIC without the boot)
                 if (!eeconfig_is_enabled()) {
@@ -655,6 +655,12 @@ bool process_record_quantum(keyrecord_t *record) {
                         clear_keyboard(); // clear first buffer to prevent stuck keys
                         keymap_config.nkro = !keymap_config.nkro;
                         break;
+                    case MAGIC_EE_HANDS_LEFT:
+                        eeconfig_update_handedness(true);
+                        break;
+                    case MAGIC_EE_HANDS_RIGHT:
+                        eeconfig_update_handedness(false);
+                        break;
                     default:
                         break;
                 }
diff --git a/quantum/quantum_keycodes.h b/quantum/quantum_keycodes.h
index 6897b54b09..faae942ce4 100644
--- a/quantum/quantum_keycodes.h
+++ b/quantum/quantum_keycodes.h
@@ -502,6 +502,8 @@ enum quantum_keycodes {
     MAGIC_SWAP_CTL_GUI,
     MAGIC_UNSWAP_CTL_GUI,
     MAGIC_TOGGLE_CTL_GUI,
+    MAGIC_EE_HANDS_LEFT,
+    MAGIC_EE_HANDS_RIGHT,
 
     WEBUSB_PAIR,
 
diff --git a/quantum/split_common/split_util.c b/quantum/split_common/split_util.c
index 5114b188ec..d16a989770 100644
--- a/quantum/split_common/split_util.c
+++ b/quantum/split_common/split_util.c
@@ -7,7 +7,6 @@
 #include "quantum.h"
 
 #ifdef EE_HANDS
-#    include "tmk_core/common/eeprom.h"
 #    include "eeconfig.h"
 #endif
 
@@ -23,7 +22,7 @@ __attribute__((weak)) bool is_keyboard_left(void) {
     setPinInput(SPLIT_HAND_PIN);
     return readPin(SPLIT_HAND_PIN);
 #elif defined(EE_HANDS)
-    return eeprom_read_byte(EECONFIG_HANDEDNESS);
+    return eeconfig_read_handedness();
 #elif defined(MASTER_RIGHT)
     return !is_keyboard_master();
 #endif
diff --git a/tmk_core/common/bootmagic.c b/tmk_core/common/bootmagic.c
index 09b1664c90..bb2aa0db8c 100644
--- a/tmk_core/common/bootmagic.c
+++ b/tmk_core/common/bootmagic.c
@@ -122,6 +122,14 @@ void bootmagic(void) {
         default_layer = eeconfig_read_default_layer();
         default_layer_set((layer_state_t)default_layer);
     }
+
+    /* EE_HANDS handedness */
+    if (bootmagic_scan_keycode(BOOTMAGIC_KEY_EE_HANDS_LEFT)) {
+        eeconfig_update_handedness(true);
+    }
+    if (bootmagic_scan_keycode(BOOTMAGIC_KEY_EE_HANDS_RIGHT)) {
+        eeconfig_update_handedness(false);
+    }
 }
 
 /** \brief Scan Keycode
diff --git a/tmk_core/common/bootmagic.h b/tmk_core/common/bootmagic.h
index fb76472579..c64dc17858 100644
--- a/tmk_core/common/bootmagic.h
+++ b/tmk_core/common/bootmagic.h
@@ -36,6 +36,12 @@
 #ifndef BOOTMAGIC_KEY_DEBUG_MOUSE
 #    define BOOTMAGIC_KEY_DEBUG_MOUSE KC_M
 #endif
+#ifndef BOOTMAGIC_KEY_EE_HANDS_LEFT
+#    define BOOTMAGIC_KEY_EE_HANDS_LEFT KC_L
+#endif
+#ifndef BOOTMAGIC_KEY_EE_HANDS_RIGHT
+#    define BOOTMAGIC_KEY_EE_HANDS_RIGHT KC_R
+#endif
 
 /*
  * keymap config
diff --git a/tmk_core/common/eeconfig.c b/tmk_core/common/eeconfig.c
index f33d831f77..4369e44ac2 100644
--- a/tmk_core/common/eeconfig.c
+++ b/tmk_core/common/eeconfig.c
@@ -163,8 +163,8 @@ uint32_t eeconfig_read_kb(void) { return eeprom_read_dword(EECONFIG_KEYBOARD); }
  *
  * FIXME: needs doc
  */
-
 void eeconfig_update_kb(uint32_t val) { eeprom_update_dword(EECONFIG_KEYBOARD, val); }
+
 /** \brief eeconfig read user
  *
  * FIXME: needs doc
@@ -176,9 +176,24 @@ uint32_t eeconfig_read_user(void) { return eeprom_read_dword(EECONFIG_USER); }
  */
 void eeconfig_update_user(uint32_t val) { eeprom_update_dword(EECONFIG_USER, val); }
 
+/** \brief eeconfig read haptic
+ *
+ * FIXME: needs doc
+ */
 uint32_t eeconfig_read_haptic(void) { return eeprom_read_dword(EECONFIG_HAPTIC); }
-/** \brief eeconfig update user
+/** \brief eeconfig update haptic
  *
  * FIXME: needs doc
  */
 void eeconfig_update_haptic(uint32_t val) { eeprom_update_dword(EECONFIG_HAPTIC, val); }
+
+/** \brief eeconfig read split handedness
+ *
+ * FIXME: needs doc
+ */
+bool eeconfig_read_handedness(void) { return !!eeprom_read_byte(EECONFIG_HANDEDNESS); }
+/** \brief eeconfig update split handedness
+ *
+ * FIXME: needs doc
+ */
+void eeconfig_update_handedness(bool val) { eeprom_update_byte(EECONFIG_HANDEDNESS, !!val); }
diff --git a/tmk_core/common/eeconfig.h b/tmk_core/common/eeconfig.h
index 6db1b0c220..a7a78b352e 100644
--- a/tmk_core/common/eeconfig.h
+++ b/tmk_core/common/eeconfig.h
@@ -107,4 +107,7 @@ uint32_t eeconfig_read_haptic(void);
 void     eeconfig_update_haptic(uint32_t val);
 #endif
 
+bool eeconfig_read_handedness(void);
+void eeconfig_update_handedness(bool val);
+
 #endif