linux-kernel - Re: [PATCH 4/6] Documentation: ABI: testing: scd30: document iio attributes

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Date:   Wed, 22 Apr 2020 18:40:17 +0200 (CEST)
From:   Peter Meerwald-Stadler <pmeerw@...erw.net>
To:     Tomasz Duszynski <tomasz.duszynski@...akon.com>
cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, robh+dt@...nel.org, jic23@...nel.org
Subject: Re: [PATCH 4/6] Documentation: ABI: testing: scd30: document iio
 attributes

On Wed, 22 Apr 2020, Tomasz Duszynski wrote:

> Add documentation for sensor specific iio attributes.

minor comments below
 
> Signed-off-by: Tomasz Duszynski <tomasz.duszynski@...akon.com>
> ---
>  Documentation/ABI/testing/sysfs-bus-iio-scd30 | 97 +++++++++++++++++++
>  1 file changed, 97 insertions(+)
>  create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-scd30
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio-scd30 b/Documentation/ABI/testing/sysfs-bus-iio-scd30
> new file mode 100644
> index 000000000000..0431a718447d
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-bus-iio-scd30
> @@ -0,0 +1,97 @@
> +What:		/sys/bus/iio/devices/iio:deviceX/pressure_comp
> +Date:		April 2020
> +KernelVersion:	5.8
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Given that sensor's CO2 measurement chamber has fixed volume
> +		pressure changes will affect concentration readings. Writing
> +		current ambient pressure here will allow senor to make necessary

sensor

> +		adjustments. Upon reading previously set value is returned.
> +		Units are millibars.

unit for pressure in IIO is kilopascal (e.g. 
/sys/bus/iio/devices/iio:deviceX/in_pressure_raw)

> +
> +What:		/sys/bus/iio/devices/iio:deviceX/pressure_comp_available
> +Date:		April 2020
> +KernelVersion:	5.8
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		The range of available values in millibars represented as the
> +		minimum value, the step and the maximum value, all enclosed in
> +		square brackets.
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/meas_interval
> +Date:		January 2020
> +KernelVersion:	5.8
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Amount of time between subsequent measurements. Writing this
> +		attribute will change measurement interval. Upon reading
> +		current measurement interval is returned. Units are seconds.
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/meas_interval_available
> +Date:		April 2020
> +KernelVersion:	5.8
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		The range of available values in seconds represented as the
> +		minimum value, the step and the maximum value, all enclosed in
> +		square brackets.
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/asc
> +Date:		April 2020
> +KernelVersion:	5.8
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Writing 1 or 0 to this attribute will respectively activate or
> +		deactivate automatic self calibration procedure. Upon reading 1

deactivate automatic self calibration (asc) procedure

> +		is returned if asc is ongoing, 0 otherwise.
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/frc
> +Date:		April 2020
> +KernelVersion:	5.8
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Forced recalibration is used to compensate for sensor drifts
> +		when a reference value of CO2 concentration in close proximity
> +		to the sensor is available. Writing attribute will set frc
> +		value. Upon reading current frc is returned. Units are
> +		millibars.
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/frc_available
> +Date:		April 2020
> +KernelVersion:	5.8
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		The range of available values in millibars represented as the
> +		minimum value, the step and the maximum value, all enclosed in
> +		square brackets.
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/temp_offset
> +Date:		April 2020
> +KernelVersion:	5.8
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Sensor readings may be affected by ambient temperature.
> +		Writing temperature offset will compensate for unwanted changes.
> +		Note that written offset gets multiplied by a factor of 100
> +		by a sensor internally.
> +
> +		For example, writing 10 here will correspond to 0.1 degree
> +		Celsius.
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/temp_offset_available
> +Date:		April 2020
> +KernelVersion:	5.8
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		The range of available values in degrees Celsius represented as
> +		the minimum value, the step and the maximum value, all enclosed
> +		in square brackets.
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/reset
> +Date:		April 2020
> +KernelVersion:	5.8
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Software reset mechanism forces sensor into the same state
> +		as after powering up without the need for removing power supply.
> +		Writing any value will reset sensor.
> 

-- 

Peter Meerwald-Stadler
Mobile: +43 664 24 44 418