Commit 4670df83 authored Dec 04, 2007 by Ben Gardner Committed by Linus Torvalds Dec 05, 2007

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@gmail.com>
Cc: Richard Knutsson <ricknu-0@student.ltu.se>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent f1dad166

drivers/char/cs5535_gpio.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -104,6 +104,11 @@ static ssize_t cs5535_gpio_write(struct file file, const char __user data,
		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);