set fan curve functionality

include/aio.h

@@ -10,6 +10,12 @@
 #define AIO_COLOR_WHITE { 255, 255, 255 }
 #define AIO_COLOR_OFF { 0, 0, 0 }
 
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+
+// roughly converts fan speed to duty
+#define SPD2DTY(spd) MAX(0, MIN(spd * 100 / max_fan_speed, 100))
+
 enum aio_pump_mode_t : uint8_t {
 	QUIET,
 	BALANCED,
@@ -29,7 +35,12 @@ struct rgb_t {
 	uint8_t b;
 };
 
-struct aio_t{
+struct curve_point_t {
+	uint8_t temp;
+	uint8_t duty;
+};
+
+struct aio_t {
 	libusb_device_handle* handle;
 	enum aio_pump_mode_t pump_mode;
 	float water_temp;