linux-kernel - Re: [PATCH 1/2] input: ti_am335x

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Message-ID: <20130828184921.GC3777@gmail.com>
Date:	Wed, 28 Aug 2013 19:49:22 +0100
From:	"Zubair Lutfullah :" <zubair.lutfullah@...il.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	Zubair Lutfullah <zubair.lutfullah@...il.com>, jic23@....ac.uk,
	lee.jones@...aro.org, linux-iio@...r.kernel.org,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	gregkh@...uxfoundation.org
Subject: Re: [PATCH 1/2] input: ti_am335x_tsc: Enable shared IRQ for TSC

On Wed, Aug 28, 2013 at 12:42:11PM +0200, Sebastian Andrzej Siewior wrote:
> * Zubair Lutfullah | 2013-08-25 23:45:23 [+0100]:
> 
> >diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
> >index e1c5300..4124e580 100644
> >--- a/drivers/input/touchscreen/ti_am335x_tsc.c
> >+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
> >@@ -315,11 +321,17 @@ static irqreturn_t titsc_irq(int irq, void *dev)
...
> >+	/* If any IRQ flags left, return none. So ADC can handle its IRQs */
> >+	status = titsc_readl(ts_dev, REG_IRQSTATUS);
> >+	if (status == false)
> >+		return IRQ_HANDLED;
> >+	else
> >+		return IRQ_NONE;
> 
> If I understand this correctly you return IRQ_NONE the TSC interrupt has
> been handled and no ADC interrupt is outstanding.

Its actually the opposite. TSC handler checks if there are any ADC IRQ flags
outstanding.

If there is no outstanding, then IRQ_HANDLED is returned.
If there is ADC IRQ outstanding, then IRQ_NONE is returned.

ZubairLK
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