linux-kernel - [PATCH] gpio_cs5535: disable AUX on output

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Message-ID: <808c8e9d0712030914x513c95b8r9daa4e97ada97511@mail.gmail.com>
Date:	Mon, 3 Dec 2007 11:14:01 -0600
From:	"Ben Gardner" <gardner.ben@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	"Andrew Morton" <akpm@...l.org>
Subject: [PATCH] gpio_cs5535: disable AUX on output

The AMD CS5535/CS5536 GPIO has two alternate output modes: AUX-1 and AUX-2.
When either AUX is enabled, the cs5535_gpio driver cannot control the output.

Some BIOS code for the Geode processor enables AUX-1 for GPIO-1, which
configures it as the PC BEEP output.

This patch will disable AUX-1 and AUX-2 when the user enables output.

Signed-of-by: Ben Gardner <gardner.ben@...il.com>

--- linux-2.6.23.1.orig/drivers/char/cs5535_gpio.c	2007-10-12
11:43:44.000000000 -0500
+++ linux-2.6.23.1/drivers/char/cs5535_gpio.c	2007-12-03
09:25:49.000000000 -0600
@@ -104,6 +104,11 @@
 		for (j = 0; j < ARRAY_SIZE(rm); j++) {
 			if (c == rm[j].on) {
 				outl(m1, base + rm[j].wr_offset);
+				/* If enabling output, turn off AUX 1 and AUX 2 */
+				if (c == 'O') {
+					outl(m0, base + 0x10);
+					outl(m0, base + 0x14);
+				}
 				break;
 			} else if (c == rm[j].off) {
 				outl(m0, base + rm[j].wr_offset);
--
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