| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * <linux/gpio.h> |
| * |
| * This is the LEGACY GPIO bulk include file, including legacy APIs. It is |
| * used for GPIO drivers still referencing the global GPIO numberspace, |
| * and should not be included in new code. |
| * |
| * If you're implementing a GPIO driver, only include <linux/gpio/driver.h> |
| * If you're implementing a GPIO consumer, only include <linux/gpio/consumer.h> |
| */ |
| #ifndef __LINUX_GPIO_H |
| #define __LINUX_GPIO_H |
| |
| #include <linux/errno.h> |
| |
| /* see Documentation/driver-api/gpio/legacy.rst */ |
| |
| /* 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) |
| |
| /** |
| * struct gpio - a structure describing a GPIO with configuration |
| * @gpio: the GPIO number |
| * @flags: GPIO configuration as specified by GPIOF_* |
| * @label: a literal description string of this GPIO |
| */ |
| struct gpio { |
| unsigned gpio; |
| unsigned long flags; |
| const char *label; |
| }; |
| |
| #ifdef CONFIG_GPIOLIB |
| |
| #ifdef CONFIG_ARCH_HAVE_CUSTOM_GPIO_H |
| #include <asm/gpio.h> |
| #else |
| |
| #include <asm-generic/gpio.h> |
| |
| static inline int gpio_get_value(unsigned int gpio) |
| { |
| return __gpio_get_value(gpio); |
| } |
| |
| static inline void gpio_set_value(unsigned int gpio, int value) |
| { |
| __gpio_set_value(gpio, value); |
| } |
| |
| static inline int gpio_cansleep(unsigned int gpio) |
| { |
| return __gpio_cansleep(gpio); |
| } |
| |
| static inline int gpio_to_irq(unsigned int gpio) |
| { |
| return __gpio_to_irq(gpio); |
| } |
| |
| static inline int irq_to_gpio(unsigned int irq) |
| { |
| return -EINVAL; |
| } |
| |
| #endif /* ! CONFIG_ARCH_HAVE_CUSTOM_GPIO_H */ |
| |
| /* CONFIG_GPIOLIB: bindings for managed devices that want to request gpios */ |
| |
| struct device; |
| |
| 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; |
| |
| static inline bool gpio_is_valid(int number) |
| { |
| return false; |
| } |
| |
| static inline int gpio_request(unsigned gpio, const char *label) |
| { |
| return -ENOSYS; |
| } |
| |
| static inline int gpio_request_one(unsigned gpio, |
| unsigned long flags, const char *label) |
| { |
| 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(); |
| |
| /* GPIO can never have been requested */ |
| 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; |
| } |
| |
| 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 */ |
| WARN_ON(1); |
| return 0; |
| } |
| |
| static inline void gpio_set_value(unsigned gpio, int value) |
| { |
| /* GPIO can never have been requested or set as output */ |
| 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 */ |
| WARN_ON(1); |
| return 0; |
| } |
| |
| static inline void gpio_set_value_cansleep(unsigned gpio, int value) |
| { |
| /* GPIO can never have been requested or set as output */ |
| 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 */ |
| WARN_ON(1); |
| 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) |
| { |
| WARN_ON(1); |
| return -EINVAL; |
| } |
| |
| static inline int devm_gpio_request_one(struct device *dev, unsigned gpio, |
| unsigned long flags, const char *label) |
| { |
| WARN_ON(1); |
| return -EINVAL; |
| } |
| |
| static inline void devm_gpio_free(struct device *dev, unsigned int gpio) |
| { |
| WARN_ON(1); |
| } |
| |
| #endif /* ! CONFIG_GPIOLIB */ |
| |
| #endif /* __LINUX_GPIO_H */ |