linux-kernel - Re: Voltage/current/sensor monitoring interface and Wiegand

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Date:	Thu, 09 Sep 2010 14:48:26 +1200
From:	Ryan Mallon <ryan@...ewatersys.com>
To:	Stuart Longland <redhatter@...too.org>
CC:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: Voltage/current/sensor monitoring interface and Wiegand

On 09/09/2010 12:02 PM, Stuart Longland wrote:
> Hi all,
> 
> I'm currently writing a driver for an in-house developed sensor
> controller device.  This device communicates via I²C, and functions as a
> multi-function device incorporating:
> 
> - Touchscreen controller
> - Keypad/Button controller
> - LED driver
> - Voltage/current monitor
> - Temperature sensor monitor
> - Light sensor monitor
> - PIR (motion) detection monitor
> - Communications interface (for slow serial links like Wiegand)

> How are voltage *monitors* normally written?  (note, not voltage
> *regulators*... this thing does not alter the voltage rails.)  I tried
> to make sense of lm-sensors, but that seems very ad-hoc (maybe I missed
> some document that explains it) to me.  It's hard to be clear on what is
> the *right* way to report a voltage or current reading to userspace.

Depending on your particular application it might make sense to use the
power supply class (see Documentation/power/power_supply_class.txt) for
the voltage/current monitoring. If the temperature sensor is related to
a power supply monitor, then it could also go there.

~Ryan

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