From: Russell King <rmk+kernel@xxxxxxxxxxxxxxx> commit 256efaea1fdc4e38970489197409a26125ee0aaa upstream. gpiolib has a corner case with open drain outputs that are emulated. When such outputs are outputting a logic 1, emulation will set the hardware to input mode, which will cause gpiod_get_direction() to report that it is in input mode. This is different from the behaviour with a true open-drain output. Unify the semantics here. Cc: <stable@xxxxxxxxxxxxxxx> Suggested-by: Linus Walleij <linus.walleij@xxxxxxxxxx> Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxx> Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpio/gpiolib.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -188,6 +188,14 @@ int gpiod_get_direction(struct gpio_desc chip = gpiod_to_chip(desc); offset = gpio_chip_hwgpio(desc); + /* + * Open drain emulation using input mode may incorrectly report + * input here, fix that up. + */ + if (test_bit(FLAG_OPEN_DRAIN, &desc->flags) && + test_bit(FLAG_IS_OUT, &desc->flags)) + return 0; + if (!chip->get_direction) return status;
