iio: Add inverse unit conversion macros

[firefly-linux-kernel-4.4.55.git] / include / linux / iio / iio.h

diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 3d35b7023591facc722dc58a22e9acbb44302726..683911167953d9f15c2580495917166821301d58 100644 (file)
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -568,6 +568,15 @@ int iio_str_to_fixpoint(const char *str, int fract_mult, int *integer,
  */
 #define IIO_DEGREE_TO_RAD(deg) (((deg) * 314159ULL + 9000000ULL) / 18000000ULL)
 
+/**
+ * IIO_RAD_TO_DEGREE() - Convert rad to degree
+ * @rad: A value in rad
+ *
+ * Returns the given value converted from rad to degree
+ */
+#define IIO_RAD_TO_DEGREE(rad) \
+       (((rad) * 18000000ULL + 314159ULL / 2) / 314159ULL)
+
 /**
  * IIO_G_TO_M_S_2() - Convert g to meter / second**2
  * @g: A value in g
@@ -576,4 +585,12 @@ int iio_str_to_fixpoint(const char *str, int fract_mult, int *integer,
  */
 #define IIO_G_TO_M_S_2(g) ((g) * 980665ULL / 100000ULL)
 
+/**
+ * IIO_M_S_2_TO_G() - Convert meter / second**2 to g
+ * @ms2: A value in meter / second**2
+ *
+ * Returns the given value converted from meter / second**2 to g
+ */
+#define IIO_M_S_2_TO_G(ms2) (((ms2) * 100000ULL + 980665ULL / 2) / 980665ULL)
+
 #endif /* _INDUSTRIAL_IO_H_ */