iio: Add I/Q modifiers

I/Q modifiers can be used to denote signals which are represented by a
in-phase and a quadrature component.

The ABI documentation describes the I and Q modifiers for current and
voltage channels for now as those will be the most likely users.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

3 files changed, 50 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index f66262c64e2f..bbed111c31b4 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -71,6 +71,8 @@ Description:
 
 What:           /sys/bus/iio/devices/iio:deviceX/in_voltageY_raw
 What:           /sys/bus/iio/devices/iio:deviceX/in_voltageY_supply_raw
+What:           /sys/bus/iio/devices/iio:deviceX/in_voltageY_i_raw
+What:           /sys/bus/iio/devices/iio:deviceX/in_voltageY_q_raw
 KernelVersion:  2.6.35
 Contact:        linux-iio@vger.kernel.org
 Description:
@@ -81,6 +83,11 @@ Description:
                 unique to allow association with event codes. Units after
                 application of scale and offset are millivolts.
 
+                Channels with 'i' and 'q' modifiers always exist in pairs and both
+                channels refer to the same signal. The 'i' channel contains the in-phase
+                component of the signal while the 'q' channel contains the quadrature
+                component.
+
 What:           /sys/bus/iio/devices/iio:deviceX/in_voltageY-voltageZ_raw
 KernelVersion:  2.6.35
 Contact:        linux-iio@vger.kernel.org
@@ -246,8 +253,16 @@ What:		/sys/bus/iio/devices/iio:deviceX/in_accel_y_offset
 What:           /sys/bus/iio/devices/iio:deviceX/in_accel_z_offset
 What:           /sys/bus/iio/devices/iio:deviceX/in_voltageY_offset
 What:           /sys/bus/iio/devices/iio:deviceX/in_voltage_offset
+What:           /sys/bus/iio/devices/iio:deviceX/in_voltageY_i_offset
+What:           /sys/bus/iio/devices/iio:deviceX/in_voltageY_q_offset
+What:           /sys/bus/iio/devices/iio:deviceX/in_voltage_q_offset
+What:           /sys/bus/iio/devices/iio:deviceX/in_voltage_i_offset
 What:           /sys/bus/iio/devices/iio:deviceX/in_currentY_offset
 What:           /sys/bus/iio/devices/iio:deviceX/in_current_offset
+What:           /sys/bus/iio/devices/iio:deviceX/in_currentY_i_offset
+What:           /sys/bus/iio/devices/iio:deviceX/in_currentY_q_offset
+What:           /sys/bus/iio/devices/iio:deviceX/in_current_q_offset
+What:           /sys/bus/iio/devices/iio:deviceX/in_current_i_offset
 What:           /sys/bus/iio/devices/iio:deviceX/in_tempY_offset
 What:           /sys/bus/iio/devices/iio:deviceX/in_temp_offset
 What:           /sys/bus/iio/devices/iio:deviceX/in_pressureY_offset
@@ -273,14 +288,22 @@ Description:
                 to the _raw output.
 
 What:           /sys/bus/iio/devices/iio:deviceX/in_voltageY_scale
+What:           /sys/bus/iio/devices/iio:deviceX/in_voltageY_i_scale
+What:           /sys/bus/iio/devices/iio:deviceX/in_voltageY_q_scale
 What:           /sys/bus/iio/devices/iio:deviceX/in_voltageY_supply_scale
 What:           /sys/bus/iio/devices/iio:deviceX/in_voltage_scale
+What:           /sys/bus/iio/devices/iio:deviceX/in_voltage_i_scale
+What:           /sys/bus/iio/devices/iio:deviceX/in_voltage_q_scale
 What:           /sys/bus/iio/devices/iio:deviceX/in_voltage-voltage_scale
 What:           /sys/bus/iio/devices/iio:deviceX/out_voltageY_scale
 What:           /sys/bus/iio/devices/iio:deviceX/out_altvoltageY_scale
 What:           /sys/bus/iio/devices/iio:deviceX/in_currentY_scale
 What:           /sys/bus/iio/devices/iio:deviceX/in_currentY_supply_scale
 What:           /sys/bus/iio/devices/iio:deviceX/in_current_scale
+What:           /sys/bus/iio/devices/iio:deviceX/in_currentY_i_scale
+What:           /sys/bus/iio/devices/iio:deviceX/in_currentY_q_scale
+What:           /sys/bus/iio/devices/iio:deviceX/in_current_i_scale
+What:           /sys/bus/iio/devices/iio:deviceX/in_current_q_scale
 What:           /sys/bus/iio/devices/iio:deviceX/in_accel_scale
 What:           /sys/bus/iio/devices/iio:deviceX/in_accel_peak_scale
 What:           /sys/bus/iio/devices/iio:deviceX/in_anglvel_scale
@@ -328,6 +351,10 @@ Description:
 
 What            /sys/bus/iio/devices/iio:deviceX/in_voltageY_calibscale
 What            /sys/bus/iio/devices/iio:deviceX/in_voltageY_supply_calibscale
+What            /sys/bus/iio/devices/iio:deviceX/in_voltageY_i_calibscale
+What            /sys/bus/iio/devices/iio:deviceX/in_voltageY_q_calibscale
+What            /sys/bus/iio/devices/iio:deviceX/in_voltage_i_calibscale
+What            /sys/bus/iio/devices/iio:deviceX/in_voltage_q_calibscale
 What            /sys/bus/iio/devices/iio:deviceX/in_voltage_calibscale
 What            /sys/bus/iio/devices/iio:deviceX/in_accel_x_calibscale
 What            /sys/bus/iio/devices/iio:deviceX/in_accel_y_calibscale
@@ -1046,6 +1073,10 @@ What:		/sys/.../iio:deviceX/scan_elements/in_timestamp_en
 What:           /sys/.../iio:deviceX/scan_elements/in_voltageY_supply_en
 What:           /sys/.../iio:deviceX/scan_elements/in_voltageY_en
 What:           /sys/.../iio:deviceX/scan_elements/in_voltageY-voltageZ_en
+What:           /sys/.../iio:deviceX/scan_elements/in_voltageY_i_en
+What:           /sys/.../iio:deviceX/scan_elements/in_voltageY_q_en
+What:           /sys/.../iio:deviceX/scan_elements/in_voltage_i_en
+What:           /sys/.../iio:deviceX/scan_elements/in_voltage_q_en
 What:           /sys/.../iio:deviceX/scan_elements/in_incli_x_en
 What:           /sys/.../iio:deviceX/scan_elements/in_incli_y_en
 What:           /sys/.../iio:deviceX/scan_elements/in_pressureY_en
@@ -1064,6 +1095,10 @@ What:		/sys/.../iio:deviceX/scan_elements/in_incli_type
 What:           /sys/.../iio:deviceX/scan_elements/in_voltageY_type
 What:           /sys/.../iio:deviceX/scan_elements/in_voltage_type
 What:           /sys/.../iio:deviceX/scan_elements/in_voltageY_supply_type
+What:           /sys/.../iio:deviceX/scan_elements/in_voltageY_i_type
+What:           /sys/.../iio:deviceX/scan_elements/in_voltageY_q_type
+What:           /sys/.../iio:deviceX/scan_elements/in_voltage_i_type
+What:           /sys/.../iio:deviceX/scan_elements/in_voltage_q_type
 What:           /sys/.../iio:deviceX/scan_elements/in_timestamp_type
 What:           /sys/.../iio:deviceX/scan_elements/in_pressureY_type
 What:           /sys/.../iio:deviceX/scan_elements/in_pressure_type
@@ -1101,6 +1136,10 @@ Description:
 
 What:           /sys/.../iio:deviceX/scan_elements/in_voltageY_index
 What:           /sys/.../iio:deviceX/scan_elements/in_voltageY_supply_index
+What:           /sys/.../iio:deviceX/scan_elements/in_voltageY_i_index
+What:           /sys/.../iio:deviceX/scan_elements/in_voltageY_q_index
+What:           /sys/.../iio:deviceX/scan_elements/in_voltage_i_index
+What:           /sys/.../iio:deviceX/scan_elements/in_voltage_q_index
 What:           /sys/.../iio:deviceX/scan_elements/in_accel_x_index
 What:           /sys/.../iio:deviceX/scan_elements/in_accel_y_index
 What:           /sys/.../iio:deviceX/scan_elements/in_accel_z_index
@@ -1260,6 +1299,8 @@ Description:
                 or without compensation from tilt sensors.
 
 What:           /sys/bus/iio/devices/iio:deviceX/in_currentX_raw
+What:           /sys/bus/iio/devices/iio:deviceX/in_currentX_i_raw
+What:           /sys/bus/iio/devices/iio:deviceX/in_currentX_q_raw
 KernelVersion:  3.18
 Contact:        linux-iio@vger.kernel.org
 Description:
@@ -1268,6 +1309,11 @@ Description:
                 present, output should be considered as processed with the
                 unit in milliamps.
 
+                Channels with 'i' and 'q' modifiers always exist in pairs and both
+                channels refer to the same signal. The 'i' channel contains the in-phase
+                component of the signal while the 'q' channel contains the quadrature
+                component.
+
 What:           /sys/.../iio:deviceX/in_energy_en
 What:           /sys/.../iio:deviceX/in_distance_en
 What:           /sys/.../iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_en
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 9688a88b6198..3524b0de8721 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -101,6 +101,8 @@ static const char * const iio_modifier_names[] = {
         [IIO_MOD_WALKING] = "walking",
         [IIO_MOD_STILL] = "still",
         [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
+        [IIO_MOD_I] = "i",
+        [IIO_MOD_Q] = "q",
 };
 
 /* 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 5c4601935005..2f8b11722204 100644
--- a/include/uapi/linux/iio/types.h
+++ b/include/uapi/linux/iio/types.h
@@ -70,6 +70,8 @@ enum iio_modifier {
         IIO_MOD_WALKING,
         IIO_MOD_STILL,
         IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z,
+        IIO_MOD_I,
+        IIO_MOD_Q,
 };
 
 enum iio_event_type {