diff options
Diffstat (limited to 'include/linux/gpio.h')
| -rw-r--r-- | include/linux/gpio.h | 175 |
1 files changed, 66 insertions, 109 deletions
diff --git a/include/linux/gpio.h b/include/linux/gpio.h index 008ad3ee56b7..c1ec62c11ed3 100644 --- a/include/linux/gpio.h +++ b/include/linux/gpio.h @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: GPL-2.0 */ /* - * <linux/gpio.h> + * NOTE: This header *must not* be included. * * This is the LEGACY GPIO bulk include file, including legacy APIs. It is * used for GPIO drivers still referencing the global GPIO numberspace, @@ -12,34 +12,14 @@ #ifndef __LINUX_GPIO_H #define __LINUX_GPIO_H -#include <linux/errno.h> +#include <linux/types.h> -/* see Documentation/driver-api/gpio/legacy.rst */ +struct device; /* make these flag values available regardless of GPIO kconfig options */ -#define GPIOF_DIR_OUT (0 << 0) -#define GPIOF_DIR_IN (1 << 0) - -#define GPIOF_INIT_LOW (0 << 1) -#define GPIOF_INIT_HIGH (1 << 1) - -#define GPIOF_IN (GPIOF_DIR_IN) -#define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT | GPIOF_INIT_LOW) -#define GPIOF_OUT_INIT_HIGH (GPIOF_DIR_OUT | GPIOF_INIT_HIGH) - -/* Gpio pin is active-low */ -#define GPIOF_ACTIVE_LOW (1 << 2) - -/* Gpio pin is open drain */ -#define GPIOF_OPEN_DRAIN (1 << 3) - -/* Gpio pin is open source */ -#define GPIOF_OPEN_SOURCE (1 << 4) - -#define GPIOF_EXPORT (1 << 5) -#define GPIOF_EXPORT_CHANGEABLE (1 << 6) -#define GPIOF_EXPORT_DIR_FIXED (GPIOF_EXPORT) -#define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE) +#define GPIOF_IN ((1 << 0)) +#define GPIOF_OUT_INIT_LOW ((0 << 0) | (0 << 1)) +#define GPIOF_OUT_INIT_HIGH ((0 << 0) | (1 << 1)) /** * struct gpio - a structure describing a GPIO with configuration @@ -55,56 +35,91 @@ struct gpio { #ifdef CONFIG_GPIOLIB -#ifdef CONFIG_ARCH_HAVE_CUSTOM_GPIO_H -#include <asm/gpio.h> -#else - -#include <asm-generic/gpio.h> +#include <linux/gpio/consumer.h> -static inline int gpio_get_value(unsigned int gpio) +/* + * "valid" GPIO numbers are nonnegative and may be passed to + * setup routines like gpio_request(). Only some valid numbers + * can successfully be requested and used. + * + * Invalid GPIO numbers are useful for indicating no-such-GPIO in + * platform data and other tables. + */ +static inline bool gpio_is_valid(int number) { - return __gpio_get_value(gpio); + /* only non-negative numbers are valid */ + return number >= 0; } -static inline void gpio_set_value(unsigned int gpio, int value) +/* + * Platforms may implement their GPIO interface with library code, + * at a small performance cost for non-inlined operations and some + * extra memory (for code and for per-GPIO table entries). + */ + +/* + * At the end we want all GPIOs to be dynamically allocated from 0. + * However, some legacy drivers still perform fixed allocation. + * Until they are all fixed, leave 0-512 space for them. + */ +#define GPIO_DYNAMIC_BASE 512 +/* + * Define the maximum of the possible GPIO in the global numberspace. + * While the GPIO base and numbers are positive, we limit it with signed + * maximum as a lot of code is using negative values for special cases. + */ +#define GPIO_DYNAMIC_MAX INT_MAX + +/* Always use the library code for GPIO management calls, + * or when sleeping may be involved. + */ +int gpio_request(unsigned gpio, const char *label); +void gpio_free(unsigned gpio); + +static inline int gpio_direction_input(unsigned gpio) { - __gpio_set_value(gpio, value); + return gpiod_direction_input(gpio_to_desc(gpio)); } - -static inline int gpio_cansleep(unsigned int gpio) +static inline int gpio_direction_output(unsigned gpio, int value) { - return __gpio_cansleep(gpio); + return gpiod_direction_output_raw(gpio_to_desc(gpio), value); } -static inline int gpio_to_irq(unsigned int gpio) +static inline int gpio_get_value_cansleep(unsigned gpio) { - return __gpio_to_irq(gpio); + return gpiod_get_raw_value_cansleep(gpio_to_desc(gpio)); } - -static inline int irq_to_gpio(unsigned int irq) +static inline void gpio_set_value_cansleep(unsigned gpio, int value) { - return -EINVAL; + gpiod_set_raw_value_cansleep(gpio_to_desc(gpio), value); } -#endif /* ! CONFIG_ARCH_HAVE_CUSTOM_GPIO_H */ +static inline int gpio_get_value(unsigned gpio) +{ + return gpiod_get_raw_value(gpio_to_desc(gpio)); +} +static inline void gpio_set_value(unsigned gpio, int value) +{ + gpiod_set_raw_value(gpio_to_desc(gpio), value); +} -/* CONFIG_GPIOLIB: bindings for managed devices that want to request gpios */ +static inline int gpio_to_irq(unsigned gpio) +{ + return gpiod_to_irq(gpio_to_desc(gpio)); +} -struct device; +int gpio_request_one(unsigned gpio, unsigned long flags, const char *label); int devm_gpio_request(struct device *dev, unsigned gpio, const char *label); int devm_gpio_request_one(struct device *dev, unsigned gpio, unsigned long flags, const char *label); -void devm_gpio_free(struct device *dev, unsigned int gpio); #else /* ! CONFIG_GPIOLIB */ #include <linux/kernel.h> -#include <linux/types.h> -#include <linux/bug.h> -struct device; -struct gpio_chip; +#include <asm/bug.h> +#include <asm/errno.h> static inline bool gpio_is_valid(int number) { @@ -122,11 +137,6 @@ static inline int gpio_request_one(unsigned gpio, return -ENOSYS; } -static inline int gpio_request_array(const struct gpio *array, size_t num) -{ - return -ENOSYS; -} - static inline void gpio_free(unsigned gpio) { might_sleep(); @@ -135,14 +145,6 @@ static inline void gpio_free(unsigned gpio) WARN_ON(1); } -static inline void gpio_free_array(const struct gpio *array, size_t num) -{ - might_sleep(); - - /* GPIO can never have been requested */ - WARN_ON(1); -} - static inline int gpio_direction_input(unsigned gpio) { return -ENOSYS; @@ -153,11 +155,6 @@ static inline int gpio_direction_output(unsigned gpio, int value) return -ENOSYS; } -static inline int gpio_set_debounce(unsigned gpio, unsigned debounce) -{ - return -ENOSYS; -} - static inline int gpio_get_value(unsigned gpio) { /* GPIO can never have been requested or set as {in,out}put */ @@ -171,13 +168,6 @@ static inline void gpio_set_value(unsigned gpio, int value) WARN_ON(1); } -static inline int gpio_cansleep(unsigned gpio) -{ - /* GPIO can never have been requested or set as {in,out}put */ - WARN_ON(1); - return 0; -} - static inline int gpio_get_value_cansleep(unsigned gpio) { /* GPIO can never have been requested or set as {in,out}put */ @@ -191,27 +181,6 @@ static inline void gpio_set_value_cansleep(unsigned gpio, int value) WARN_ON(1); } -static inline int gpio_export(unsigned gpio, bool direction_may_change) -{ - /* GPIO can never have been requested or set as {in,out}put */ - WARN_ON(1); - return -EINVAL; -} - -static inline int gpio_export_link(struct device *dev, const char *name, - unsigned gpio) -{ - /* GPIO can never have been exported */ - WARN_ON(1); - return -EINVAL; -} - -static inline void gpio_unexport(unsigned gpio) -{ - /* GPIO can never have been exported */ - WARN_ON(1); -} - static inline int gpio_to_irq(unsigned gpio) { /* GPIO can never have been requested or set as input */ @@ -219,13 +188,6 @@ static inline int gpio_to_irq(unsigned gpio) return -EINVAL; } -static inline int irq_to_gpio(unsigned irq) -{ - /* irq can never have been returned from gpio_to_irq() */ - WARN_ON(1); - return -EINVAL; -} - static inline int devm_gpio_request(struct device *dev, unsigned gpio, const char *label) { @@ -240,11 +202,6 @@ static inline int devm_gpio_request_one(struct device *dev, unsigned gpio, return -EINVAL; } -static inline void devm_gpio_free(struct device *dev, unsigned int gpio) -{ - WARN_ON(1); -} - #endif /* ! CONFIG_GPIOLIB */ #endif /* __LINUX_GPIO_H */ |