[v7 01/14] iio: add modifiers for linear acceleration

[<andrea.merello@iit.it>]

From: Andrea Merello <andrea.merello@iit.it>

Add IIO_MOD_LINEAR_X, IIO_MOD_LINEAR_Y and IIO_MOD_LINEAR_Z modifiers to te
IIO core, which is preparatory for adding the Bosch BNO055 IMU driver.

Bosch BNO055 IMU can report raw accelerations (among x, y and z axis) as
well as the so called "linear accelerations" (again, among x, y and z axis)
which is basically the acceleration after subtracting gravity and for which
those new modifiers are for.

Signed-off-by: Andrea Merello <andrea.merello@iit.it>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
---
 drivers/iio/industrialio-core.c | 3 +++
 include/uapi/linux/iio/types.h  | 4 +++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index d38623c046cc..37f7e231fce2 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -134,6 +134,9 @@ static const char * const iio_modifier_names[] = {
 	[IIO_MOD_ETHANOL] = "ethanol",
 	[IIO_MOD_H2] = "h2",
 	[IIO_MOD_O2] = "o2",
+	[IIO_MOD_LINEAR_X] = "linear_x",
+	[IIO_MOD_LINEAR_Y] = "linear_y",
+	[IIO_MOD_LINEAR_Z] = "linear_z",
 };
 
 /* relies on pairs of these shared then separate */
diff --git a/include/uapi/linux/iio/types.h b/include/uapi/linux/iio/types.h
index 472cead10d8d..0993f6b697fc 100644
--- a/include/uapi/linux/iio/types.h
+++ b/include/uapi/linux/iio/types.h
@@ -95,6 +95,9 @@ enum iio_modifier {
 	IIO_MOD_ETHANOL,
 	IIO_MOD_H2,
 	IIO_MOD_O2,
+	IIO_MOD_LINEAR_X,
+	IIO_MOD_LINEAR_Y,
+	IIO_MOD_LINEAR_Z,
 };
 
 enum iio_event_type {
@@ -115,4 +118,3 @@ enum iio_event_direction {
 };
 
 #endif /* _UAPI_IIO_TYPES_H_ */
-
-- 
2.17.1