-#define GPIOC 0x5018 // this may be external DDC on i830
-#define GPIOD 0x501C // this is DVO DDC
-#define GPIOE 0x5020 // this is DVO i2C
+#define GPIOC 0x5018 /* this may be external DDC on i830 */
+#define GPIOD 0x501C /* this is DVO DDC */
+#define GPIOE 0x5020 /* this is DVO i2C */