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Commit 27be8423 authored by Irina Tirdea's avatar Irina Tirdea Committed by Jonathan Cameron
Browse files

iio: core: Introduce CHANGE event type 

A step detector will generate an interrupt each time N step are detected.
A device that has such pedometer functionality is Freescale's MMA9553L:
http://www.freescale.com/files/sensors/doc/ref_manual/MMA9553LSWRM.pdf

.

Introduce IIO_EV_TYPE_CHANGE event type for events that are generated
when the channel passes a threshold on the absolute change in value.

Signed-off-by: default avatarIrina Tirdea <irina.tirdea@intel.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent d37f6836

Documentation/ABI/testing/sysfs-bus-iio

+16 −4
Original line number Diff line number Diff line
@@ -891,12 +891,24 @@ Description: 
		number or direction is not specified, applies to all channels of

		this type.



What:		/sys/.../events/in_steps_instance_en

KernelVersion:	3.19

What:		/sys/.../events/in_steps_change_en

KernelVersion:	3.20

Contact:	linux-iio@vger.kernel.org

Description:

		Enables or disables step detection. Each time the user takes a step an

		event of this type will be generated.

		Event generated when channel passes a threshold on the absolute

		change in value. E.g. for steps: a step change event is

		generated each time the user takes N steps, where N is set using

		in_steps_change_value.



What:		/sys/.../events/in_steps_change_value

KernelVersion:	3.20

Contact:	linux-iio@vger.kernel.org

Description:

		Specifies the value of change threshold that the

		device is comparing against for the events enabled by

		<type>[Y][_name]_roc[_rising|falling|]_en. E.g. for steps:

		if set to 3, a step change event will be generated every 3

		steps.



What:		/sys/bus/iio/devices/iio:deviceX/trigger/current_trigger

KernelVersion:	2.6.35

drivers/iio/industrialio-event.c

+1 −0
Original line number Diff line number Diff line
@@ -198,6 +198,7 @@ static const char * const iio_ev_type_text[] = { 
	[IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",

	[IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",

	[IIO_EV_TYPE_INSTANCE] = "instance",

	[IIO_EV_TYPE_CHANGE] = "change",

};



static const char * const iio_ev_dir_text[] = {

drivers/staging/iio/Documentation/iio_event_monitor.c

+2 −0
Original line number Diff line number Diff line
@@ -60,6 +60,7 @@ static const char * const iio_ev_type_text[] = { 
	[IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",

	[IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",

	[IIO_EV_TYPE_INSTANCE] = "instance",

	[IIO_EV_TYPE_CHANGE] = "change",

};



static const char * const iio_ev_dir_text[] = {
@@ -179,6 +180,7 @@ static bool event_is_known(struct iio_event_data *event) 
	case IIO_EV_TYPE_THRESH_ADAPTIVE:

	case IIO_EV_TYPE_MAG_ADAPTIVE:

	case IIO_EV_TYPE_INSTANCE:

	case IIO_EV_TYPE_CHANGE:

		break;

	default:

		return false;

include/linux/iio/types.h

+1 −0
Original line number Diff line number Diff line
@@ -79,6 +79,7 @@ enum iio_event_type { 
	IIO_EV_TYPE_THRESH_ADAPTIVE,

	IIO_EV_TYPE_MAG_ADAPTIVE,

	IIO_EV_TYPE_INSTANCE,

	IIO_EV_TYPE_CHANGE,

};



enum iio_event_info {