linux-kernel - Re: [PATCH v10 02/18] counter: Documentation: Add Generic Counter sysfs documentation

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Message-ID: <20190408215531.GB27592@amd>
Date:   Mon, 8 Apr 2019 23:55:31 +0200
From:   Pavel Machek <pavel@....cz>
To:     William Breathitt Gray <vilhelm.gray@...il.com>
Cc:     gregkh@...uxfoundation.org, jic23@...nel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        fabrice.gasnier@...com, benjamin.gaignard@...com, knaack.h@....de,
        lars@...afoo.de, pmeerw@...erw.net, akpm@...ux-foundation.org,
        david@...hnology.com, robh+dt@...nel.org, mark.rutland@....com,
        shawnguo@...nel.org, leoyang.li@....com, daniel.lezcano@...aro.org,
        tglx@...utronix.de, thierry.reding@...il.com, esben@...bendal.dk,
        linux-pwm@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        patrick.havelange@...ensium.com,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: Re: [PATCH v10 02/18] counter: Documentation: Add Generic Counter
 sysfs documentation

On Tue 2019-04-02 15:30:37, William Breathitt Gray wrote:
> This patch adds standard documentation for the userspace sysfs
> attributes of the Generic Counter interface.
> 
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
> ---
>  Documentation/ABI/testing/sysfs-bus-counter | 230 ++++++++++++++++++++
>  MAINTAINERS                                 |   1 +
>  2 files changed, 231 insertions(+)
>  create mode 100644 Documentation/ABI/testing/sysfs-bus-counter
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-counter b/Documentation/ABI/testing/sysfs-bus-counter
> new file mode 100644
> index 000000000000..566bd99fe0a5
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-bus-counter
> @@ -0,0 +1,230 @@
> +What:		/sys/bus/counter/devices/counterX/countY/count
> +KernelVersion:	5.2
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Count data of Count Y represented as a string.
> +
> +What:		/sys/bus/counter/devices/counterX/countY/ceiling
> +KernelVersion:	5.2
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Count value ceiling for Count Y. This is the upper limit for the
> +		respective counter.
> +
> +What:		/sys/bus/counter/devices/counterX/countY/floor
> +KernelVersion:	5.2
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Count value floor for Count Y. This is the lower limit for the
> +		respective counter.
> +
> +What:		/sys/bus/counter/devices/counterX/countY/count_mode
> +KernelVersion:	5.2
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Count mode for channel Y. The ceiling and floor values for
> +		Count Y are used by the count mode where required. The following
> +		count modes are available:
> +
> +		normal:
> +			Counting is continuous in either direction.
> +
> +		range limit:
> +			An upper or lower limit is set, mimicking limit switches
> +			in the mechanical counterpart. The upper limit is set to
> +			the Count Y ceiling value, while the lower limit is set
> +			to the Count Y floor value. The counter freezes at
> +			count = ceiling when counting up, and at count = floor
> +			when counting down. At either of these limits, the
> +			counting is resumed only when the count direction is
> +			reversed.
> +
> +		non-recycle:
> +			The counter is disabled whenever a counter overflow or
> +			underflow takes place. The counter is re-enabled when a
> +			new count value is loaded to the counter via a preset
> +			operation or direct write.
> +
> +		modulo-n:
> +			A count value boundary is set between the Count Y floor
> +			value and the Count Y ceiling value. The counter is
> +			reset to the Count Y floor value at count = ceiling when
> +			counting up, while the counter is set to the Count Y
> +			ceiling value at count = floor when counting down; the
> +			counter does not freeze at the boundary points, but
> +			counts continuously throughout.
> +
> +What:		/sys/bus/counter/devices/counterX/countY/count_mode_available
> +What:		/sys/bus/counter/devices/counterX/countY/error_noise_available
> +What:		/sys/bus/counter/devices/counterX/countY/function_available
> +What:		/sys/bus/counter/devices/counterX/countY/signalZ_action_available
> +KernelVersion:	5.2
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Discrete set of available values for the respective Count Y
> +		configuration are listed in this file. Values are delimited by
> +		newline characters.

Elsewhere in sysfs we do space-separated:

pavel@amd:~$ cat /sys/power/state
freeze mem disk

And we use [] to mark current selection:

pavel@amd:~$ cat /sys/class/leds/tpacpi\:\:thinkvantage/trigger
[none] bluetooth-power rfkill-any rfkill-none kbd-scrolllock
kbd-numlock kbd-capslock kbd-kanalock kbd-shiftlock kbd-altgrlock
kbd-ctrllock kbd-altlock kbd-shiftllock kbd-shiftrlock kbd-ctrlllock
kbd-ctrlrlock AC-online BAT0-charging-or-full BAT0-charging BAT0-full
BAT0-charging-blink-full-solid rfkill0 phy0rx phy0tx phy0assoc
phy0radio phy0tpt mmc0 timer heartbeat audio-mute audio-micmute
rfkill1

Note this only works if you have less than PAGE_SIZE of entries... and
will never have more.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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