linux-kernel - Re: [PATCH 0/5] hwmon: New hwmon registration API

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Message-ID: <87d1mobhnm.fsf@e105922-lin.cambridge.arm.com>
Date:	Fri, 08 Jul 2016 10:31:09 +0100
From:	Punit Agrawal <punit.agrawal@....com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Jean Delvare <jdelvare@...e.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <edubezval@...il.com>,
	linux-pm@...r.kernel.org, linux-iio@...r.kernel.org,
	linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] hwmon: New hwmon registration API

Hi Guenter,

Guenter Roeck <linux@...ck-us.net> writes:

> Up to now, each hwmon driver has to implement its own sysfs attributes.
> This requires a lot of template code, and distracts from the driver's
> core function to read and write chip registers.
>
> To be able to reduce driver complexity, move sensor attribute handling
> and thermal zone registration into the hwmon core. By using the new API,
> driver size is typically reduced by 20-50% depending on driver complexity
> and the number of sysfs attributes supported.
>
> The first patch of the series introduces the API as well as support
> for temperature sensors. Subsequent patches introduce support for
> voltage, current, power, energy, humidity, and fan speed sensors.
>
> The series was tested by converting several drivers (lm75, lm90, tmp102,
> tmp421, ltc4245) to the new API. Testing was done with with real chips
> as well as with the hwmon driver module test code available at
> https://github.com/groeck/module-tests.

I like this series - it takes all of the attributes' handling out of the
individual driver code and moving it to hwmon core.

Having attempted a port of scpi-hwmon.c, I think that driver will not
gain a big savings in line count. Though it'll help separate access to
sensors from sysfs related code - which I think is worth the change.

FWIW,

        Acked-by: Punit Agrawal <punit.agrawal@....com>

Thanks,
Punit

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