diff options
| author | Michał Mirosław <[email protected]> | 2019-12-11 03:40:55 +0100 |
|---|---|---|
| committer | Ulf Hansson <[email protected]> | 2019-12-18 13:36:02 +0100 |
| commit | d3a5bcb4a17f1ad072484bb92c42519ff3aba6e1 (patch) | |
| tree | 3bbc5b18ec08c1bddbe71bfb63e5d4183ee7a321 | |
| parent | 2c3039c14380bc7b857f7afaaed68a0b8176c3db (diff) | |
gpio: add gpiod_toggle_active_low()
Add possibility to toggle active-low flag of a gpio descriptor. This is
useful for compatibility code, where defaults are inverted vs DT gpio
flags or the active-low flag is taken from elsewhere.
Acked-by: Linus Walleij <[email protected]>
Signed-off-by: Michał Mirosław <[email protected]>
Link: https://lore.kernel.org/r/7ce0338e01ad17fa5a227176813941b41a7c35c1.1576031637.git.mirq-linux@rere.qmqm.pl
Signed-off-by: Ulf Hansson <[email protected]>
| -rw-r--r-- | drivers/gpio/gpiolib.c | 11 | ||||
| -rw-r--r-- | include/linux/gpio/consumer.h | 7 |
2 files changed, 18 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 9913886ede90..6130691e2047 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -3363,6 +3363,17 @@ int gpiod_is_active_low(const struct gpio_desc *desc) } EXPORT_SYMBOL_GPL(gpiod_is_active_low); +/** + * gpiod_toggle_active_low - toggle whether a GPIO is active-low or not + * @desc: the gpio descriptor to change + */ +void gpiod_toggle_active_low(struct gpio_desc *desc) +{ + VALIDATE_DESC_VOID(desc); + change_bit(FLAG_ACTIVE_LOW, &desc->flags); +} +EXPORT_SYMBOL_GPL(gpiod_toggle_active_low); + /* I/O calls are only valid after configuration completed; the relevant * "is this a valid GPIO" error checks should already have been done. * diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h index 5215fdba6b9a..bf2d017dd7b7 100644 --- a/include/linux/gpio/consumer.h +++ b/include/linux/gpio/consumer.h @@ -158,6 +158,7 @@ int gpiod_set_raw_array_value_cansleep(unsigned int array_size, int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce); int gpiod_set_transitory(struct gpio_desc *desc, bool transitory); +void gpiod_toggle_active_low(struct gpio_desc *desc); int gpiod_is_active_low(const struct gpio_desc *desc); int gpiod_cansleep(const struct gpio_desc *desc); @@ -483,6 +484,12 @@ static inline int gpiod_set_transitory(struct gpio_desc *desc, bool transitory) return -ENOSYS; } +static inline void gpiod_toggle_active_low(struct gpio_desc *desc) +{ + /* GPIO can never have been requested */ + WARN_ON(desc); +} + static inline int gpiod_is_active_low(const struct gpio_desc *desc) { /* GPIO can never have been requested */ |