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| author | Marc Zyngier <maz@misterjones.org> | 2010-05-26 14:42:21 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-27 09:12:41 -0700 |
| commit | a13c1868aa60ae7a2516b8d00ee8873dea587581 (patch) | |
| tree | a90f714d48a3e076ef9093d5eb584e5655fbd5bd /drivers/gpio/max732x.c | |
| parent | 5535cb681c38bda94af02ef4b043a25b52303e65 (diff) | |
| download | linux-stable-a13c1868aa60ae7a2516b8d00ee8873dea587581.tar.gz linux-stable-a13c1868aa60ae7a2516b8d00ee8873dea587581.tar.bz2 linux-stable-a13c1868aa60ae7a2516b8d00ee8873dea587581.zip | |
gpio: max732x: fix input configuration for open-drain pins
Fix a bug I noticed while hacking on the max732x driver for interrupt
support. According to the datasheets, open-drain pins have to be
configured as output-high (which in that case is actually high impedance)
to be used as input.
Signed-off-by: Marc Zyngier <maz@misterjones.org>
Acked-by: Eric Miao <eric.y.miao@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/gpio/max732x.c')
| -rw-r--r-- | drivers/gpio/max732x.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/gpio/max732x.c b/drivers/gpio/max732x.c index 26ff40110d9f..9cad60f9e962 100644 --- a/drivers/gpio/max732x.c +++ b/drivers/gpio/max732x.c @@ -232,6 +232,13 @@ static int max732x_gpio_direction_input(struct gpio_chip *gc, unsigned off) return -EACCES; } + /* + * Open-drain pins must be set to high impedance (which is + * equivalent to output-high) to be turned into an input. + */ + if ((mask & chip->dir_output)) + max732x_gpio_set_value(gc, off, 1); + return 0; } |