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diff --git a/keyboards/xd84/pca9555.h b/keyboards/xd84/pca9555.h
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+/* Copyright 2019
+ *
+ * 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
+
+/*
+ PCA9555
+ ,----------.
+ SDA --| SDA P00 |-- P1
+ SCL --| SCL P01 |-- P2
+ INT --| INT P02 |-- P3
+ | P03 |-- P4
+ A0 --| A0 P04 |-- P5
+ A1 --| A1 P05 |-- P6
+ A2 --| A2 P06 |-- P7
+ | P07 |-- P8
+ | |
+ | P10 |-- P10
+ | P11 |-- P11
+ | P12 |-- P12
+ | P13 |-- P13
+ | P14 |-- P14
+ | P15 |-- P15
+ | P16 |-- P16
+ | P17 |-- P17
+ `----------'
+*/
+
+#define PCA9555_PORT0 0
+#define PCA9555_PORT1 1
+
+#define ALL_OUTPUT 0
+#define ALL_INPUT 0xFF
+#define ALL_LOW 0
+#define ALL_HIGH 0xFF
+
+void pca9555_init(uint8_t slave_addr);
+
+void pca9555_set_config(uint8_t slave_addr, uint8_t port, uint8_t conf);
+
+void pca9555_set_output(uint8_t slave_addr, uint8_t port, uint8_t conf);
+
+uint8_t pca9555_readPins(uint8_t slave_addr, uint8_t port); \ No newline at end of file