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>
diff --git a/drivers/char/cs5535_gpio.c b/drivers/char/cs5535_gpio.c
index fe6d240..c2d23ca 100644
--- a/drivers/char/cs5535_gpio.c
+++ b/drivers/char/cs5535_gpio.c
@@ -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);