linux-kernel - Re: [RFC v1 2/4] iio: resistance: add IIO

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Message-ID: <55EB10D1.1080502@kernel.org>
Date:	Sat, 5 Sep 2015 16:57:05 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Matt Ranostay <mranostay@...il.com>, lars@...afoo.de,
	pmeerw@...erw.net
Cc:	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC v1 2/4] iio: resistance: add IIO_RESISTANCE channel type

On 05/09/15 06:53, Matt Ranostay wrote:
> Signed-off-by: Matt Ranostay <mranostay@...il.com>
> ---
>  Documentation/ABI/testing/sysfs-bus-iio | 6 ++++++
>  drivers/iio/industrialio-core.c         | 1 +
>  include/uapi/linux/iio/types.h          | 1 +
>  3 files changed, 8 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
> index a3803a1..1084659 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio
> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> @@ -1469,3 +1469,9 @@ Description:
>  		Raw (unscaled no offset etc.) concentration reading of data like
>  		CO2 or VOC (Volatile Organic Compounds) substances with or without
>  		ppm (Part Per Million) or ppb (Parts Per Billion) channel modifiers.
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/in_resistance_raw
> +KernelVersion:	4.3
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Raw (unscaled no offset etc.) resistance reading in ohms.
Fair enough I guess, though I would presume this is really a current measurement
at a known voltage.  Still measuring it as a resistance does save having to
specify the particular voltage so looks good to me.
> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> index ea9e31a..862c066 100644
> --- a/drivers/iio/industrialio-core.c
> +++ b/drivers/iio/industrialio-core.c
> @@ -76,6 +76,7 @@ static const char * const iio_chan_type_name_spec[] = {
>  	[IIO_DISTANCE] = "distance",
>  	[IIO_VELOCITY] = "velocity",
>  	[IIO_CONCENTRATION] = "concentration",
> +	[IIO_RESISTANCE] = "resistance",
>  };
>  
>  static const char * const iio_modifier_names[] = {
> diff --git a/include/uapi/linux/iio/types.h b/include/uapi/linux/iio/types.h
> index dfb8b8c..22edd4d 100644
> --- a/include/uapi/linux/iio/types.h
> +++ b/include/uapi/linux/iio/types.h
> @@ -36,6 +36,7 @@ enum iio_chan_type {
>  	IIO_DISTANCE,
>  	IIO_VELOCITY,
>  	IIO_CONCENTRATION,
> +	IIO_RESISTANCE,
>  };
>  
>  enum iio_modifier {
> 

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