linux-kernel - Re: PCA GPIO interrupt triggers

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Date:	Sat, 24 Mar 2012 17:02:12 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Peter Rusko <rusko.peter@...lan.hu>,
	David Jander <david@...tonic.nl>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: PCA GPIO interrupt triggers

On Thu, 22 Mar 2012 16:58:09 +0100, Peter Rusko <rusko.peter@...lan.hu> wrote:
> Hi,
> 
> I'm using a GPIO chip (PCA9554) for a matrix-keypad. The keypad driver 
> itself needs interrupts for both rising and falling edges. The PCA 
> driver (gpio-pca953x.c) doesn't support it, but I don't understand why.
> 
> I think, this patch should work:

Can someone with hardware review this patch please?  David perhaps?

g.

> 
> diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
> index 147df8a..be9aff4 100644
> --- a/drivers/gpio/gpio-pca953x.c
> +++ b/drivers/gpio/gpio-pca953x.c
> @@ -356,12 +356,6 @@ static int pca953x_irq_set_type(struct irq_data *d, 
> unsigned int type)
>          uint16_t level = d->irq - chip->irq_base;
>          uint16_t mask = 1 << level;
> 
> -       if (!(type & IRQ_TYPE_EDGE_BOTH)) {
> -               dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
> -                       d->irq, type);
> -               return -EINVAL;
> -       }
> -
>          if (type & IRQ_TYPE_EDGE_FALLING)
>                  chip->irq_trig_fall |= mask;
>          else
> 
> I think that the other parts of the code checks for rising and falling 
> edges correctly. Am I missing something?
> 
> -- 
> Ruskó Péter
> Fejlesztőmérnök
> 
> Prolan Zrt. / Prolan Co.
> Hungary 2011 Budakalász, Szentendrei út 1-3.
> Tel./Phone: +36 20 954 3118
> Fax: +36 26 540 420
> E-mail: rusko.peter@...lan.hu
> Web: www.prolan.hu
> Timezone:CET

-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies,Ltd.
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