1 files changed, 37 insertions, 1 deletions
diff --git a/include/hw/i2c/bitbang_i2c.h b/include/hw/i2c/bitbang_i2c.h
index 3a7126d5de..92334e9016 100644
--- a/include/hw/i2c/bitbang_i2c.h
+++ b/include/hw/i2c/bitbang_i2c.h
@@ -8,7 +8,43 @@ typedef struct bitbang_i2c_interface bitbang_i2c_interface;
 #define BITBANG_I2C_SDA 0
 #define BITBANG_I2C_SCL 1
 
-bitbang_i2c_interface *bitbang_i2c_init(I2CBus *bus);
+typedef enum bitbang_i2c_state {
+    STOPPED = 0,
+    SENDING_BIT7,
+    SENDING_BIT6,
+    SENDING_BIT5,
+    SENDING_BIT4,
+    SENDING_BIT3,
+    SENDING_BIT2,
+    SENDING_BIT1,
+    SENDING_BIT0,
+    WAITING_FOR_ACK,
+    RECEIVING_BIT7,
+    RECEIVING_BIT6,
+    RECEIVING_BIT5,
+    RECEIVING_BIT4,
+    RECEIVING_BIT3,
+    RECEIVING_BIT2,
+    RECEIVING_BIT1,
+    RECEIVING_BIT0,
+    SENDING_ACK,
+    SENT_NACK
+} bitbang_i2c_state;
+
+struct bitbang_i2c_interface {
+    I2CBus *bus;
+    bitbang_i2c_state state;
+    int last_data;
+    int last_clock;
+    int device_out;
+    uint8_t buffer;
+    int current_addr;
+};
+
+/**
+ * bitbang_i2c_init: in-place initialize the bitbang_i2c_interface struct
+ */
+void bitbang_i2c_init(bitbang_i2c_interface *s, I2CBus *bus);
 int bitbang_i2c_set(bitbang_i2c_interface *i2c, int line, int level);
 
 #endif