1 files changed, 32 insertions, 0 deletions
diff --git a/keyboards/torn/mcp23018.h b/keyboards/torn/mcp23018.h
new file mode 100644
index 000000000..17ecaa5a7
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+++ b/keyboards/torn/mcp23018.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright 2020 Richard Titmuss (richard.titmuss@gmail.com)
+ *
+ * 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
+
+#define IODIRA 0x00
+#define IODIRB 0x01
+#define GPPUA 0x0C
+#define GPPUB 0x0D
+#define GPIOA 0x12
+#define GPIOB 0x13
+
+typedef int16_t mcp23018_status_t;
+
+void              msp23018_init(void);
+bool              mcp23018_reset_required(void);
+mcp23018_status_t mcp23018_writeReg(uint8_t regaddr, const uint8_t* data, uint16_t length);
+mcp23018_status_t mcp23018_readReg(uint8_t regaddr, uint8_t* data, uint16_t length);