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| author | Andrey Smirnov <andrew.smirnov@gmail.com> | 2017-06-03 20:11:52 -0700 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2017-06-06 08:27:15 +0200 |
| commit | bbc499914739cd51f51cd23ade0a2dca19359804 (patch) | |
| tree | 6b36fb0e96430f15657283e200ec810be16d0158 /include | |
| parent | 08dd7b2bf240c262ff585546115e8a96ca5b52d7 (diff) | |
| download | barebox-bbc499914739cd51f51cd23ade0a2dca19359804.tar.gz barebox-bbc499914739cd51f51cd23ade0a2dca19359804.tar.xz | |
gpiolib: Add code to support "active low" GPIOs
So far this particular aspect of various DT-bindings has been handled
on a per-driver basis. With this change, hopefully, we'll have a
single place to handle necessary logic inversions and eventually
would be able to migrate existing users as well as avoiding adding
redundant code to new drivers.
Cc: cphealy@gmail.com
Cc: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/gpio.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/include/gpio.h b/include/gpio.h index 7b3f512b19..56aae22236 100644 --- a/include/gpio.h +++ b/include/gpio.h @@ -6,6 +6,11 @@ void gpio_set_value(unsigned gpio, int value); int gpio_get_value(unsigned gpio); int gpio_direction_output(unsigned gpio, int value); int gpio_direction_input(unsigned gpio); + +void gpio_set_active(unsigned gpio, bool state); +int gpio_is_active(unsigned gpio); +int gpio_direction_active(unsigned gpio, bool state); + #else static inline void gpio_set_value(unsigned gpio, int value) { @@ -22,6 +27,18 @@ static inline int gpio_direction_input(unsigned gpio) { return -EINVAL; } + +static inline void gpio_set_active(unsigned gpio, int value) +{ +} +static inline int gpio_is_active(unsigned gpio) +{ + return 0; +} +static inline int gpio_direction_active(unsigned gpio, int value) +{ + return -EINVAL; +} #endif #define ARCH_NR_GPIOS 256 @@ -45,6 +62,14 @@ static inline int gpio_is_valid(int gpio) #define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT | GPIOF_INIT_LOW) #define GPIOF_OUT_INIT_HIGH (GPIOF_DIR_OUT | GPIOF_INIT_HIGH) +#define GPIOF_LOGICAL BIT(2) +#define GPIOF_ACTIVE_HIGH GPIOF_LOGICAL +#define GPIOF_ACTIVE_LOW (BIT(3) | GPIOF_LOGICAL) +#define GPIOF_INIT_INACTIVE GPIOF_LOGICAL +#define GPIOF_INIT_ACTIVE (GPIOF_LOGICAL | GPIOF_INIT_HIGH) +#define GPIOF_OUT_INIT_ACTIVE (GPIOF_DIR_OUT | GPIOF_INIT_ACTIVE) +#define GPIOF_OUT_INIT_INACTIVE (GPIOF_DIR_OUT | GPIOF_INIT_INACTIVE) + /** * struct gpio - a structure describing a GPIO with configuration * @gpio: the GPIO number |