linux-kernel - Re: [RFC/PATCH 4/4] gpio: smscece: Add support for gpio IO expander feature

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Message-ID: <20120821120052.GD10347@arwen.pp.htv.fi>
Date:	Tue, 21 Aug 2012 15:00:54 +0300
From:	Felipe Balbi <balbi@...com>
To:	"Poddar, Sourav" <sourav.poddar@...com>
Cc:	balbi@...com, devicetree-discuss@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [RFC/PATCH 4/4] gpio: smscece: Add support for gpio IO expander
 feature

Hi,

On Tue, Aug 21, 2012 at 05:17:37PM +0530, Poddar, Sourav wrote:
> >> +     if (type & IRQ_TYPE_LEVEL_HIGH)
> >> +             sg->int_lvl[bank] |= bit;
> >> +     else if (type & IRQ_TYPE_LEVEL_LOW)
> >> +             sg->int_lvl[bank] &= ~bit;
> >> +     else
> >> +             return -EINVAL;
> >
> > this looks wrong. You could have a user who wants to trigger on both
> > HIGH and LOW levels, no ?
> >
> Yes, I think there can be a scenario where gpio_keys are attached
> to this driver and signals a "key press" at low and "key release" at
> high. ?
>  Will figure out a way to add support to check for case where
> both High and low levels are used.

could probably be done on a separate patch, maybe... Just now I saw that
HIGH and LOW levels use the same bit.

-- 
balbi

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