linux-kernel - Re: [RFC] Regulator: Possibility of passing notifications of non alarm events.

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Message-Id: <1231065078.11643.116.camel@vega.slimlogic.co.uk>
Date:	Sun, 04 Jan 2009 10:31:18 +0000
From:	Liam Girdwood <lrg@...mlogic.co.uk>
To:	Jonathan Cameron <jic23@....ac.uk>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	broonie@...nsource.wolfsonmicro.com
Subject: Re: [RFC] Regulator: Possibility of passing notifications of non
 alarm events.

On Sat, 2009-01-03 at 21:11 +0000, Jonathan Cameron wrote:
> Dear All,
> 
> I am in the process of writing an hwmon driver for the Sensiron SHT15 humidity
> sensor.
> 
> In common (I assume) with lots of other devices, the formula for converting
> the outputs of this chip to real units involves the supply voltage.
> Unfortunately the chip doesn't itself have any means of measuring this.
> Obviously this can be supplied via a board config if it is constant.
> 
> As I have it connected to a DA9030 pmic I can register it as a consumer
> and hence query what the pmic thinks it is supplying.
> 
> Unfortunately this regulator is shared with a number of other chips and so
> there is no guarantee that this voltage won't be changed (within the bounds
> supported by the SHT15).  I'd like to avoid querying the regulator voltage
> every time I do a conversion.
> 
> As the regulator framework already allows you to register to receive events
> such as under voltage detections, it seems to me that it would also make sense
> to allow registrations of handlers for events that occur during normal
> operation such as voltage changes.
> 
> What do people think to adding this functionality?

Sounds fine. I assume you have a patch in development ;)

Thanks

Liam


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