linux-kernel - Set_up irq problem while using gpio

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Message-ID: <aecf5e530807142304m60ef0cb2pe1c3592ae1abc7eb@mail.gmail.com>
Date:	Tue, 15 Jul 2008 11:34:23 +0530
From:	"sasa sasa" <sasak.1983@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Set_up irq problem while using gpio

Hi,

I have query that the below patch has to applied on irq/manage.c file or not.
--- kernel_old/irq/manage.c 2008-02-07 22:11:14.000000000 +0530
+++ kernel_new/irq/manage.c 2008-02-07 22:19:14.000000000 +0530
@@ -349,8 +349,14 @@
        /* Setup the type (level, edge polarity) if configured: */
        if (new->flags & IRQF_TRIGGER_MASK) {
            if (desc->chip && desc->chip->set_type)
-               desc->chip->set_type(irq,
-                       new->flags & IRQF_TRIGGER_MASK);
+           {
+               if((desc->chip->set_type(irq,
+                       new->flags & IRQF_TRIGGER_MASK)))
+               {
+                   spin_unlock_irqrestore(&desc->lock, flags);
+                   return -ESPIPE;
+               }
+           }
            else
                /*
                 * IRQF_TRIGGER_* but the PIC does not support

The reason is that in case of gpio pins used as interrupt pin but that
pin has already been ocuupied in other mode (like alternate function
mode or in software mode) by other device. In that case, some error
mechanism must be there, if we are requesting that gpio pin as
interrupt through request_irq function.

Regards
Sasa
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