diff --git a/src/include/device/i2c.h b/src/include/device/i2c.h
index b152bb9..c8c7b22 100644
--- a/src/include/device/i2c.h
+++ b/src/include/device/i2c.h
@@ -19,6 +19,19 @@
 #include <stdint.h>
 #include <stdlib.h>
 
+enum i2c_speed {
+	I2C_SPEED_STANDARD	= 100000,
+	I2C_SPEED_FAST		= 400000,
+	I2C_SPEED_FAST_PLUS	= 1000000,
+	I2C_SPEED_HIGH		= 3400000,
+	I2C_SPEED_FAST_ULTRA	= 5000000,
+};
+
+enum i2c_address_mode {
+	I2C_MODE_7_BIT,
+	I2C_MODE_10_BIT
+};
+
 struct i2c_seg
 {
 	int read;