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Commit ec6670ae authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Jonathan Cameron
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iio: Add a hysteresis event info attribute 



For some devices it is possible to configure a hysteresis for threshold (or
similar) events. This patch adds a new hysteresis event info type which allows
for easy creation and read/write handling of the sysfs attribute.

Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 3ea48e01

Documentation/ABI/testing/sysfs-bus-iio

+56 −0
Original line number Diff line number Diff line
@@ -537,6 +537,62 @@ Description: 
		value is in raw device units or in processed units (as _raw

		and _input do on sysfs direct channel read attributes).



What:		/sys/.../events/in_accel_x_thresh_rising_hysteresis

What:		/sys/.../events/in_accel_x_thresh_falling_hysteresis

What:		/sys/.../events/in_accel_x_thresh_either_hysteresis

What:		/sys/.../events/in_accel_y_thresh_rising_hysteresis

What:		/sys/.../events/in_accel_y_thresh_falling_hysteresis

What:		/sys/.../events/in_accel_y_thresh_either_hysteresis

What:		/sys/.../events/in_accel_z_thresh_rising_hysteresis

What:		/sys/.../events/in_accel_z_thresh_falling_hysteresis

What:		/sys/.../events/in_accel_z_thresh_either_hysteresis

What:		/sys/.../events/in_anglvel_x_thresh_rising_hysteresis

What:		/sys/.../events/in_anglvel_x_thresh_falling_hysteresis

What:		/sys/.../events/in_anglvel_x_thresh_either_hysteresis

What:		/sys/.../events/in_anglvel_y_thresh_rising_hysteresis

What:		/sys/.../events/in_anglvel_y_thresh_falling_hysteresis

What:		/sys/.../events/in_anglvel_y_thresh_either_hysteresis

What:		/sys/.../events/in_anglvel_z_thresh_rising_hysteresis

What:		/sys/.../events/in_anglvel_z_thresh_falling_hysteresis

What:		/sys/.../events/in_anglvel_z_thresh_either_hysteresis

What:		/sys/.../events/in_magn_x_thresh_rising_hysteresis

What:		/sys/.../events/in_magn_x_thresh_falling_hysteresis

What:		/sys/.../events/in_magn_x_thresh_either_hysteresis

What:		/sys/.../events/in_magn_y_thresh_rising_hysteresis

What:		/sys/.../events/in_magn_y_thresh_falling_hysteresis

What:		/sys/.../events/in_magn_y_thresh_either_hysteresis

What:		/sys/.../events/in_magn_z_thresh_rising_hysteresis

What:		/sys/.../events/in_magn_z_thresh_falling_hysteresis

What:		/sys/.../events/in_magn_z_thresh_either_hysteresis

What:		/sys/.../events/in_voltageY_thresh_rising_hysteresis

What:		/sys/.../events/in_voltageY_thresh_falling_hysteresis

What:		/sys/.../events/in_voltageY_thresh_either_hysteresis

What:		/sys/.../events/in_tempY_thresh_rising_hysteresis

What:		/sys/.../events/in_tempY_thresh_falling_hysteresis

What:		/sys/.../events/in_tempY_thresh_either_hysteresis

What:		/sys/.../events/in_illuminance0_thresh_falling_hysteresis

what:		/sys/.../events/in_illuminance0_thresh_rising_hysteresis

what:		/sys/.../events/in_illuminance0_thresh_either_hysteresis

what:		/sys/.../events/in_proximity0_thresh_falling_hysteresis

what:		/sys/.../events/in_proximity0_thresh_rising_hysteresis

what:		/sys/.../events/in_proximity0_thresh_either_hysteresis

KernelVersion:	3.13

Contact:	linux-iio@vger.kernel.org

Description:

		Specifies the hysteresis of threshold that the device is comparing

		against for the events enabled by

		<type>Y[_name]_thresh[_(rising|falling)]_hysteresis.

		If separate attributes exist for the two directions, but

		direction is not specified for this attribute, then a single

		hysteresis value applies to both directions.

		For falling events the hysteresis is added to the _value attribute for

		this event to get the upper threshold for when the event goes back to

		normal, for rising events the hysteresis is subtracted from the _value

		attribute. E.g. if in_voltage0_raw_thresh_rising_value is set to 1200

		and in_voltage0_raw_thresh_rising_hysteresis is set to 50. The event

		will get activated once in_voltage0_raw goes above 1200 and will become

		deactived again once the value falls below 1150.



What:		/sys/.../events/in_accel_x_raw_roc_rising_value

What:		/sys/.../events/in_accel_x_raw_roc_falling_value

What:		/sys/.../events/in_accel_y_raw_roc_rising_value

drivers/iio/industrialio-event.c

+1 −0
Original line number Diff line number Diff line
@@ -204,6 +204,7 @@ static const char * const iio_ev_dir_text[] = { 
static const char * const iio_ev_info_text[] = {

	[IIO_EV_INFO_ENABLE] = "en",

	[IIO_EV_INFO_VALUE] = "value",

	[IIO_EV_INFO_HYSTERESIS] = "hysteresis",

};



static enum iio_event_direction iio_ev_attr_dir(struct iio_dev_attr *attr)

include/linux/iio/types.h

+1 −0
Original line number Diff line number Diff line
@@ -65,6 +65,7 @@ enum iio_event_type { 
enum iio_event_info {

	IIO_EV_INFO_ENABLE,

	IIO_EV_INFO_VALUE,

	IIO_EV_INFO_HYSTERESIS,

};



enum iio_event_direction {