linux-kernel - Re: How about a gpio_get(device *, char *) function?

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Message-ID: <CACRpkdZfqn7JwD-876vaKob2Ati7+N5PWOsLpG=j9SwyfufROA@mail.gmail.com>
Date:	Sat, 1 Dec 2012 19:41:39 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	Alex Courbot <acourbot@...dia.com>,
	Stephen Warren <swarren@...dotorg.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: How about a gpio_get(device *, char *) function?

On Thu, Nov 29, 2012 at 6:34 PM, Grant Likely <grant.likely@...retlab.ca> wrote:
> On Wed, 28 Nov 2012 12:38:38 +0900, Alex Courbot <acourbot@...dia.com> wrote:
>> On Monday 26 November 2012 19:14:31 Grant Likely wrote:
>> > I don't have any problem with a gpio_get function, but I do agree that
>> > making it return an opaque handle is how it should be written with a new
>> > set of accessors. The handle should probably be simply the pointer to
>> > the &gpio_desc[number] which is a private table in gpiolib.c. The
>> > definition of it isn't available outside of gpiolib.c
>>
>> That looks like a reasonable approach, but this would make the new API
>> available only to systems that use GPIOlib. Shouldn't we be concerned about
>> making this available to all GPIO implementations? Or is GPIOlib so widely
>> used that we don't care?
>
> I'm tempted to say non-gpiolib is not supported. However, there isn't
> anything that would prevent non-gpiolib users from implementing the api
> themselves, but they'd need to provide their own handle..

I get the creeps when you say that ...

Now I think I have to put on my TODO to remove a few custom GPIO
implementations so it feels better. ;-)

Yours,
Linus Walleij
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