1 files changed, 67 insertions, 0 deletions
diff --git a/drivers/gpio/pca9505.h b/drivers/gpio/pca9505.h
new file mode 100644
index 0000000000..732ddb88ea
--- /dev/null
+++ b/drivers/gpio/pca9505.h
@@ -0,0 +1,67 @@
+// Copyright 2022 nirim000
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/**
+ * Port ID
+ */
+typedef enum {
+    PCA9505_PORT0,
+    PCA9505_PORT1,
+    PCA9505_PORT2,
+    PCA9505_PORT3,
+    PCA9505_PORT4,
+} pca9505_port_t;
+
+/**
+ * Helpers for set_config
+ */
+enum {
+    ALL_NORMAL   = 0,
+    ALL_INVERTED = 0xFF,
+};
+
+/**
+ * Helpers for set_config
+ */
+enum {
+    ALL_OUTPUT = 0,
+    ALL_INPUT  = 0xFF,
+};
+
+/**
+ * Helpers for set_output
+ */
+enum {
+    ALL_LOW  = 0,
+    ALL_HIGH = 0xFF,
+};
+
+/**
+ * Init expander and any other dependent drivers
+ */
+void pca9505_init(uint8_t slave_addr);
+
+/**
+ * Configure input/output to a given port
+ */
+bool pca9505_set_config(uint8_t slave_addr, pca9505_port_t port, uint8_t conf);
+
+/**
+ * Configure polarity to a given port
+ */
+bool pca9505_set_polarity(uint8_t slave_addr, pca9505_port_t port, uint8_t conf);
+
+/**
+ * Write high/low to a given port
+ */
+bool pca9505_set_output(uint8_t slave_addr, pca9505_port_t port, uint8_t conf);
+
+/**
+ * Read state of a given port
+ */
+bool pca9505_readPins(uint8_t slave_addr, pca9505_port_t port, uint8_t* ret);