#define CR_AREF(a) (((a) >> 24) & 0x03)
#define CR_FLAGS_MASK 0xfc000000
-#define CR_ALT_FILTER (1 << 26)
+#define CR_ALT_FILTER BIT(26)
#define CR_DITHER CR_ALT_FILTER
#define CR_DEGLITCH CR_ALT_FILTER
-#define CR_ALT_SOURCE (1 << 27)
-#define CR_EDGE (1 << 30)
-#define CR_INVERT (1 << 31)
+#define CR_ALT_SOURCE BIT(27)
+#define CR_EDGE BIT(30)
+#define CR_INVERT BIT(31)
#define AREF_GROUND 0x00 /* analog ref = analog ground */
#define AREF_COMMON 0x01 /* analog ref = analog common */
#define RANGE_LENGTH(b) ((b) & 0xffff)
#define RF_UNIT(flags) ((flags) & 0xff)
-#define RF_EXTERNAL (1 << 8)
+#define RF_EXTERNAL BIT(8)
#define UNIT_volt 0
#define UNIT_mA 1