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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 <linus.walleij@linaro.org>
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Link: https://lore.kernel.org/r/7ce0338e01ad17fa5a227176813941b41a7c35c1.1576031637.git.mirq-linux@rere.qmqm.pl
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Michał Mirosław 2019-12-11 03:40:55 +01:00 committed by Ulf Hansson
parent 2c3039c143
commit d3a5bcb4a1
2 changed files with 18 additions and 0 deletions
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11
drivers/gpio/gpiolib.c
View File

@ -3363,6 +3363,17 @@ int gpiod_is_active_low(const struct gpio_desc *desc)
} }
EXPORT_SYMBOL_GPL(gpiod_is_active_low); 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 /* I/O calls are only valid after configuration completed; the relevant
* "is this a valid GPIO" error checks should already have been done. * "is this a valid GPIO" error checks should already have been done.
* *

7
include/linux/gpio/consumer.h
View File

@ -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_debounce(struct gpio_desc *desc, unsigned debounce);
int gpiod_set_transitory(struct gpio_desc *desc, bool transitory); 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_is_active_low(const struct gpio_desc *desc);
int gpiod_cansleep(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; 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) static inline int gpiod_is_active_low(const struct gpio_desc *desc)
{ {
/* GPIO can never have been requested */ /* GPIO can never have been requested */