linux-kernel - PCA GPIO interrupt triggers

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <4F6B4C11.4000608@prolan.hu>
Date:	Thu, 22 Mar 2012 16:58:09 +0100
From:	Peter Rusko <rusko.peter@...lan.hu>
To:	Grant Likely <grant.likely@...retlab.ca>
CC:	<linux-kernel@...r.kernel.org>
Subject: PCA GPIO interrupt triggers

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:

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/