linux-kernel - Re: Correct location for ADC/DAC drivers

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Date:	Fri, 4 May 2007 10:54:05 +0200
From:	Stefan Roese <ml@...fan-roese.de>
To:	Robert Schwebel <r.schwebel@...gutronix.de>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: Correct location for ADC/DAC drivers

On Friday 04 May 2007 10:24, Robert Schwebel wrote:
> On Tue, May 01, 2007 at 02:35:44PM +0200, Stefan Roese wrote:
> > I'm in the stage of integrating some ADC and DAC drivers for the AMCC
> > 405EZ PPC and looking for the correct location to place these drivers
> > in the Linux source tree. The drivers are basically character-drivers,
> > so my first thought is to put them in "drivers/char/adc/foo.c" or
> > "drivers/char/adc_foo.c". Is this a good solution?
> >
> > Any suggestions welcome (could be that I missed an already existing
> > example).
> >
> > BTW: I am aware of the hwmon subsystem, but I don't think it fits my
> > needs in this case.
>
> Could you elaborate the requirements a bit more? ADC is not ADC, because
> slow i2c ADCs which measure a temperature every five minutes have other
> requirements than multi-megabyte-per-second-dma-driven ADCs.

The hardware (PPC405EZ) actually implements an high speed, dma capable, ADC 
controller with 10-bit resolution and up to 4MHz sample rate. The current 
driver doesn't support all these features though (dma is not supported right 
now for example). Could be that this will be added in future releases. It 
would be good though, to have the driver located at the "correct" place in 
the kernel tree right away.

Best regards,
Stefan
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