diff options
| author |   Ben Gardner <gardner.ben@gmail.com> | 2007-12-04 23:45:24 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-12-05 09:21:20 -0800 |
| commit | 4670df831cb479ba57dd0fa0b8a9eb88cc7129be (patch) | |
| tree | 4d9a868a29e040f7b20175bfc0051956f015dc12 | |
| parent | Avoid potential NULL dereference in unregister_sysctl_table (diff) | |
| download | linux-dev-4670df831cb479ba57dd0fa0b8a9eb88cc7129be.tar.xz linux-dev-4670df831cb479ba57dd0fa0b8a9eb88cc7129be.zip | |
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>
| -rw-r--r-- | drivers/char/cs5535_gpio.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/char/cs5535_gpio.c b/drivers/char/cs5535_gpio.c index fe6d2407baed..c2d23cae9515 100644 --- a/drivers/char/cs5535_gpio.c +++ b/drivers/char/cs5535_gpio.c @@ -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); |