[PATCH v6 6/7] iio: ABI: Add custom data type

[Francesco Lavra <flavra@baylibre.com>]

This type is used when the data received from or sent to a device cannot be
identified with a standard type and must be processed by custom userspace.
Any driver using the custom type must provide a driver-specific document
that explains what the data represents and how it is to be interpreted by
userspace.

Signed-off-by: Francesco Lavra <flavra@baylibre.com>
---
 Documentation/ABI/testing/sysfs-bus-iio | 19 +++++++++++++++++++
 drivers/iio/industrialio-core.c         |  1 +
 include/uapi/linux/iio/types.h          |  1 +
 3 files changed, 21 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index 61961bca4dce..2e45e54f54eb 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -450,6 +450,8 @@ What:		/sys/bus/iio/devices/iio:deviceX/in_magn_offset
 What:		/sys/bus/iio/devices/iio:deviceX/in_rot_offset
 What:		/sys/bus/iio/devices/iio:deviceX/in_angl_offset
 What:		/sys/bus/iio/devices/iio:deviceX/in_capacitanceY_offset
+What:		/sys/bus/iio/devices/iio:deviceX/in_custom_offset
+What:		/sys/bus/iio/devices/iio:deviceX/in_customY_offset
 KernelVersion:	2.6.35
 Contact:	linux-iio@vger.kernel.org
 Description:
@@ -507,6 +509,8 @@ What:		/sys/bus/iio/devices/iio:deviceX/in_intensity_red_scale
 What:		/sys/bus/iio/devices/iio:deviceX/in_intensity_green_scale
 What:		/sys/bus/iio/devices/iio:deviceX/in_intensity_blue_scale
 What:		/sys/bus/iio/devices/iio:deviceX/in_concentration_co2_scale
+What:		/sys/bus/iio/devices/iio:deviceX/in_custom_scale
+What:		/sys/bus/iio/devices/iio:deviceX/in_customY_scale
 KernelVersion:	2.6.35
 Contact:	linux-iio@vger.kernel.org
 Description:
@@ -1486,6 +1490,8 @@ What:		/sys/.../iio:deviceX/bufferY/in_pressureY_en
 What:		/sys/.../iio:deviceX/bufferY/in_pressure_en
 What:		/sys/.../iio:deviceX/bufferY/in_rot_quaternion_en
 What:		/sys/.../iio:deviceX/bufferY/in_proximity_en
+What:		/sys/.../iio:deviceX/bufferY/in_custom_en
+What:		/sys/.../iio:deviceX/bufferY/in_customZ_en
 KernelVersion:	5.11
 Contact:	linux-iio@vger.kernel.org
 Description:
@@ -1505,6 +1511,8 @@ What:		/sys/.../iio:deviceX/bufferY/in_pressureY_type
 What:		/sys/.../iio:deviceX/bufferY/in_pressure_type
 What:		/sys/.../iio:deviceX/bufferY/in_rot_quaternion_type
 What:		/sys/.../iio:deviceX/bufferY/in_proximity_type
+What:		/sys/.../iio:deviceX/bufferY/in_custom_type
+What:		/sys/.../iio:deviceX/bufferY/in_customZ_type
 KernelVersion:	5.11
 Contact:	linux-iio@vger.kernel.org
 Description:
@@ -1566,6 +1574,8 @@ What:		/sys/.../iio:deviceX/bufferY/in_pressureY_index
 What:		/sys/.../iio:deviceX/bufferY/in_pressure_index
 What:		/sys/.../iio:deviceX/bufferY/in_rot_quaternion_index
 What:		/sys/.../iio:deviceX/bufferY/in_proximity_index
+What:		/sys/.../iio:deviceX/bufferY/in_custom_index
+What:		/sys/.../iio:deviceX/bufferY/in_customZ_index
 KernelVersion:	5.11
 Contact:	linux-iio@vger.kernel.org
 Description:
@@ -2393,6 +2403,15 @@ Description:
 		The x and y light color coordinate on the CIE 1931 chromaticity
 		diagram.
 
+What:		/sys/bus/iio/devices/iio:deviceX/in_custom_raw
+What:		/sys/bus/iio/devices/iio:deviceX/in_customY_raw
+KernelVersion:	7.1
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Custom input value, whose type is driver-specific and is described
+		in a separate document. It can have a modifier Y, in which case it
+		is a measuremement from channel Y.
+
 What:		/sys/bus/iio/devices/iio:deviceX/events/in_altvoltageY_mag_either_label
 What:		/sys/bus/iio/devices/iio:deviceX/events/in_altvoltageY_mag_rising_label
 What:		/sys/bus/iio/devices/iio:deviceX/events/in_altvoltageY_thresh_falling_label
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 22eefd048ba9..dd179e3b0fb7 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -98,6 +98,7 @@ static const char * const iio_chan_type_name_spec[] = {
 	[IIO_CHROMATICITY] = "chromaticity",
 	[IIO_ATTENTION] = "attention",
 	[IIO_ALTCURRENT] = "altcurrent",
+	[IIO_CUSTOM] = "custom"
 };
 
 static const char * const iio_modifier_names[] = {
diff --git a/include/uapi/linux/iio/types.h b/include/uapi/linux/iio/types.h
index 6d269b844271..47fefcdd693c 100644
--- a/include/uapi/linux/iio/types.h
+++ b/include/uapi/linux/iio/types.h
@@ -53,6 +53,7 @@ enum iio_chan_type {
 	IIO_CHROMATICITY,
 	IIO_ATTENTION,
 	IIO_ALTCURRENT,
+	IIO_CUSTOM
 };
 
 enum iio_modifier {
-- 
2.39.5