[RFC 2/2] IIO : core: Introduce Quaternion types

[Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>]

Introduced IIO_VAL_QUATERNION and its formatting. Format used here:
x:y:z:w
In addition quat_rot is added to the channel type name specification and
new modifier IIO_MOD_QUATERNION to the list of iio modifiers.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
 drivers/iio/industrialio-core.c | 5 +++++
 include/linux/iio/types.h       | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index f0f2a1a..8b6a2fe 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -69,6 +69,7 @@ static const char * const iio_chan_type_name_spec[] = {
 	[IIO_ALTVOLTAGE] = "altvoltage",
 	[IIO_CCT] = "cct",
 	[IIO_PRESSURE] = "pressure",
+	[IIO_QUAT_ROT] = "quat_rot",
 };
 
 static const char * const iio_modifier_names[] = {
@@ -83,6 +84,7 @@ static const char * const iio_modifier_names[] = {
 	[IIO_MOD_LIGHT_RED] = "red",
 	[IIO_MOD_LIGHT_GREEN] = "green",
 	[IIO_MOD_LIGHT_BLUE] = "blue",
+	[IIO_MOD_QUATERNION] = "quaternion",
 };
 
 /* relies on pairs of these shared then separate */
@@ -403,6 +405,9 @@ ssize_t iio_format_value(char *buf, unsigned int type, int *vals)
 		vals[1] = do_div(tmp, 1000000000LL);
 		vals[0] = tmp;
 		return sprintf(buf, "%d.%09u\n", vals[0], vals[1]);
+	case IIO_VAL_QUATERNION:
+		return sprintf(buf, "%d:%d:%d:%d\n", vals[0], vals[1], vals[2],
+							vals[3]);
 	default:
 		return 0;
 	}
diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h
index 4ac928e..878db0e 100644
--- a/include/linux/iio/types.h
+++ b/include/linux/iio/types.h
@@ -29,6 +29,7 @@ enum iio_chan_type {
 	IIO_ALTVOLTAGE,
 	IIO_CCT,
 	IIO_PRESSURE,
+	IIO_QUAT_ROT,
 };
 
 enum iio_modifier {
@@ -52,6 +53,7 @@ enum iio_modifier {
 	IIO_MOD_LIGHT_RED,
 	IIO_MOD_LIGHT_GREEN,
 	IIO_MOD_LIGHT_BLUE,
+	IIO_MOD_QUATERNION,
 };
 
 enum iio_event_type {
@@ -78,6 +80,7 @@ enum iio_event_direction {
 #define IIO_VAL_INT_PLUS_MICRO 2
 #define IIO_VAL_INT_PLUS_NANO 3
 #define IIO_VAL_INT_PLUS_MICRO_DB 4
+#define IIO_VAL_QUATERNION 5
 #define IIO_VAL_FRACTIONAL 10
 #define IIO_VAL_FRACTIONAL_LOG2 11
 
-- 
1.8.3.2