linux-kernel - Re: [PATCH v4] iio: add LM3533 ambient-light-sensor driver

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Date:	Tue, 22 May 2012 08:49:58 +0100
From:	Jonathan Cameron <jic23@....ac.uk>
To:	michael.hennerich@...log.com
CC:	Jonathan Cameron <jic23@...nel.org>,
	Johan Hovold <jhovold@...il.com>,
	Rob Landley <rob@...dley.net>,
	Richard Purdie <rpurdie@...ys.net>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Florian Tobias Schandinat <FlorianSchandinat@....de>,
	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>
Subject: Re: [PATCH v4] iio: add LM3533 ambient-light-sensor driver

On 5/22/2012 8:45 AM, Michael Hennerich wrote:
> On 05/21/2012 06:37 PM, Jonathan Cameron wrote:
>> Michael cc'd for comments on core support of some stuff that is also
>> in frequency drivers down the end of the email.
>>
>> On 05/21/2012 10:50 AM, Johan Hovold wrote:
>>> On Sat, May 19, 2012 at 09:48:23AM +0100, Jonathan Cameron wrote:
>>>> On 05/18/2012 02:07 PM, Johan Hovold wrote:
>>>> So to summarise, we get the following new sysfs-entries for the ALS
>>>> (where the first set replace targetX_Y):
>>>>
>>>> out_currentX_currentY_raw r/w, (0..255), X in 0..2, Y in 0..4
>>>> out_currentX_raw ro (0..255), X in 0..2
>>>>
>>>> Is there any support in core for the first set or should I simply
>>>> rename my target attributes?
>> No support in the core yet for this sort of thing..
>> Michael, any thoughts on this? In a sense it's very similar to
>> out_altvoltageX_frequencyY_raw etc...
>>
> Hi,
>
> Exactly it's similar to what we have on the DDS parts.
> The DDS parts would also benefit from a second index.
>
> Can someone think of an use case where we have 'differential' or 'modified'
> together with this pattern?
>
> If not we could use channel2 and introduce an new flag, but I fear
> that we end up using channel2 for too many things.
> So we should better introduce an new variable?
>
New variable. Tedious but channel2 is getting rather too overloaded.


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