Commit 45d29185 authored by William Breathitt Gray's avatar William Breathitt Gray Committed by Greg Kroah-Hartman
Browse files

counter: Introduce the Count capture component 

Some devices provide a latch function to save historic Count values.
This patch standardizes exposure of such functionality as Count capture
components. A COUNTER_COMP_CAPTURE macro is provided for driver authors
to define a capture component. A new event COUNTER_EVENT_CAPTURE is
introduced to represent Count value capture events.

Cc: Julien Panis <jpanis@baylibre.com>
Link: https://lore.kernel.org/r/c239572ab4208d0d6728136e82a88ad464369a7a.1664204990.git.william.gray@linaro.org/


Signed-off-by: default avatarWilliam Breathitt Gray <william.gray@linaro.org>
Link: https://lore.kernel.org/r/3cebaa0b807a225eb277d771504fe6dba7269ffd.1664318353.git.william.gray@linaro.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9830288a

Documentation/ABI/testing/sysfs-bus-counter

+7 −0
Original line number Diff line number Diff line
@@ -4,6 +4,12 @@ Contact: linux-iio@vger.kernel.org 
Description:

		Count data of Count Y represented as a string.



What:		/sys/bus/counter/devices/counterX/countY/capture

KernelVersion:	6.1

Contact:	linux-iio@vger.kernel.org

Description:

		Historical capture of the Count Y count data.



What:		/sys/bus/counter/devices/counterX/countY/ceiling

KernelVersion:	5.2

Contact:	linux-iio@vger.kernel.org
@@ -203,6 +209,7 @@ Description: 
		both edges:

			Any state transition.



What:		/sys/bus/counter/devices/counterX/countY/capture_component_id

What:		/sys/bus/counter/devices/counterX/countY/ceiling_component_id

What:		/sys/bus/counter/devices/counterX/countY/floor_component_id

What:		/sys/bus/counter/devices/counterX/countY/count_mode_component_id

include/linux/counter.h

+3 −0
Original line number Diff line number Diff line
@@ -453,6 +453,9 @@ struct counter_available { 
	.priv = &(_available), \

}



#define COUNTER_COMP_CAPTURE(_read, _write) \

	COUNTER_COMP_COUNT_U64("capture", _read, _write)



#define COUNTER_COMP_CEILING(_read, _write) \

	COUNTER_COMP_COUNT_U64("ceiling", _read, _write)

include/uapi/linux/counter.h

+2 −0
Original line number Diff line number Diff line
@@ -63,6 +63,8 @@ enum counter_event_type { 
	COUNTER_EVENT_INDEX,

	/* State of counter is changed */

	COUNTER_EVENT_CHANGE_OF_STATE,

	/* Count value captured */

	COUNTER_EVENT_CAPTURE,

};



/**