1 files changed, 45 insertions, 0 deletions
diff --git a/keyboards/yiancardesigns/seigaiha/seigaiha.c b/keyboards/yiancardesigns/seigaiha/seigaiha.c
new file mode 100644
index 0000000000..911034eb56
--- /dev/null
+++ b/keyboards/yiancardesigns/seigaiha/seigaiha.c
@@ -0,0 +1,45 @@
+/* Copyright 2021 Yiancar-Designs
+ *
+ * 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/>.
+ */
+#include "seigaiha.h"
+#include "i2c_master.h"
+
+// There is no need to initialize the I/O it is done in matrix.c
+
+uint8_t send_data = 0x00;
+
+bool led_update_kb(led_t led_state) {
+    bool res = led_update_user(led_state);
+    if(res) {
+        if (led_state.caps_lock){
+            send_data |= 1 << 5;
+        } else {
+            send_data &= ~(1 << 5);
+        }
+        i2c_writeReg((PORT_EXPANDER_ADDRESS << 1), 0x0A, &send_data, 1, 20);
+    }
+    return res;
+}
+
+__attribute__((weak)) layer_state_t layer_state_set_user(layer_state_t state) {
+    if (IS_LAYER_ON_STATE(state, 1)) {
+        send_data |= 1 << 6;
+    }
+    if (IS_LAYER_OFF_STATE(state, 1)) {
+        send_data &= ~(1 << 6);
+    }
+    // Data is send to the port expander during led_update_kb as it runs continuously.
+  return state;
+}