#define LG3_MAGIC 'k'
#define LG3_GRAB _IO(LG3_MAGIC, 1)
#define LG3_DAC_HIGH _IO(LG3_MAGIC, 2)
#define LG3_DAC_LOW _IO(LG3_MAGIC, 3)
#define LG3_SET_LUT _IO(LG3_MAGIC, 4)
#define TRIG 1
#define NON_TRIG 0