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| author | Linus Walleij <linus.walleij@linaro.org> | 2013-09-04 12:17:08 (GMT) |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2013-09-04 12:22:47 (GMT) |
| commit | 65d876564e989b63b0f769e0e06b9830db97b2d9 (patch) | |
| tree | 2549b0ba6ad1aa90f049cdc35ebf75ddd50b6271 | |
| parent | be1a4b13089b1e18da83a549d49163ccad3c19ba (diff) | |
| download | linux-65d876564e989b63b0f769e0e06b9830db97b2d9.tar.xz | |
gpio: return -ENOTSUPP if debounce cannot be set
It appears some drivers are using gpio_set_debounce()
opportunistically, i.e. without knowing whether it works or
not. (Example: input/keyboard/gpio_keys.c) to account for
this use case, return -ENOTSUPP and do not print any
warnings in this case.
Took a round over the other gpio_set_debounce() consumers
to make sure that none of them are relying on the returned
error code to be something specific.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| -rw-r--r-- | drivers/gpio/gpiolib.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 0cbddda..86ef346 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1763,6 +1763,9 @@ EXPORT_SYMBOL_GPL(gpio_direction_output); * gpio_set_debounce - sets @debounce time for a @gpio * @gpio: the gpio to set debounce time * @debounce: debounce time is microseconds + * + * returns -ENOTSUPP if the controller does not support setting + * debounce. */ static int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) { @@ -1778,9 +1781,9 @@ static int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) chip = desc->chip; if (!chip->set || !chip->set_debounce) { - pr_warn("%s: missing set() or set_debounce() operations\n", + pr_debug("%s: missing set() or set_debounce() operations\n", __func__); - return -EIO; + return -ENOTSUPP; } spin_lock_irqsave(&gpio_lock, flags); |