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counter: Introduce the Count capture component

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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: William Breathitt Gray <william.gray@linaro.org>
Link: https://lore.kernel.org/r/3cebaa0b807a225eb277d771504fe6dba7269ffd.1664318353.git.william.gray@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
William Breathitt Gray 2022-09-27 18:53:40 -04:00 committed by Greg Kroah-Hartman
parent 9830288aea
commit 45d2918520
3 changed files with 12 additions and 0 deletions
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7
Documentation/ABI/testing/sysfs-bus-counter
View file

@ -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

3
include/linux/counter.h
View file

@ -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)

2
include/uapi/linux/counter.h
View file

@ -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,
};
/**