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include/linux/gpio.h
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/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __LINUX_GPIO_H #define __LINUX_GPIO_H |
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#include <linux/errno.h> |
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/* see Documentation/gpio/gpio-legacy.txt */ |
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/* 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) |
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/* Gpio pin is active-low */ #define GPIOF_ACTIVE_LOW (1 << 2) |
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/* Gpio pin is open drain */ |
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#define GPIOF_OPEN_DRAIN (1 << 3) |
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/* Gpio pin is open source */ |
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#define GPIOF_OPEN_SOURCE (1 << 4) |
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#define GPIOF_EXPORT (1 << 5) #define GPIOF_EXPORT_CHANGEABLE (1 << 6) |
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#define GPIOF_EXPORT_DIR_FIXED (GPIOF_EXPORT) #define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE) |
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/** * 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; }; |
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#ifdef CONFIG_GPIOLIB |
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#ifdef CONFIG_ARCH_HAVE_CUSTOM_GPIO_H |
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#include <asm/gpio.h> |
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#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; } |
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#endif /* ! CONFIG_ARCH_HAVE_CUSTOM_GPIO_H */ |
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/* 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); |
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#else /* ! CONFIG_GPIOLIB */ |
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#include <linux/kernel.h> |
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#include <linux/types.h> |
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#include <linux/bug.h> |
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#include <linux/pinctrl/pinctrl.h> |
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struct device; |
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struct gpio_chip; |
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static inline bool gpio_is_valid(int number) |
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{ |
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return false; |
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} |
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static inline int gpio_request(unsigned gpio, const char *label) |
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{ return -ENOSYS; } |
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static inline int gpio_request_one(unsigned gpio, |
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unsigned long flags, const char *label) { return -ENOSYS; } |
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static inline int gpio_request_array(const struct gpio *array, size_t num) |
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{ return -ENOSYS; } |
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static inline void gpio_free(unsigned gpio) { |
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might_sleep(); |
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/* GPIO can never have been requested */ |
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WARN_ON(1); } |
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static inline void gpio_free_array(const struct gpio *array, size_t num) |
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{ might_sleep(); /* GPIO can never have been requested */ WARN_ON(1); } |
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static inline int gpio_direction_input(unsigned gpio) |
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{ return -ENOSYS; } |
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static inline int gpio_direction_output(unsigned gpio, int value) |
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{ return -ENOSYS; } |
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static inline int gpio_set_debounce(unsigned gpio, unsigned debounce) { return -ENOSYS; } |
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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); } |
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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; } |
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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; } |
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static inline void gpio_unexport(unsigned gpio) { /* GPIO can never have been exported */ WARN_ON(1); } |
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static inline int gpio_to_irq(unsigned gpio) { /* GPIO can never have been requested or set as input */ WARN_ON(1); return -EINVAL; } |
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static inline int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) |
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{ WARN_ON(1); return -EINVAL; } |
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static inline void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) |
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{ WARN_ON(1); } |
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static inline int irq_to_gpio(unsigned irq) { /* irq can never have been returned from gpio_to_irq() */ WARN_ON(1); return -EINVAL; } |
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static inline int |
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gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, |
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unsigned int gpio_offset, unsigned int pin_offset, |
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unsigned int npins) |
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{ |
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WARN_ON(1); return -EINVAL; |
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} |
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static inline int gpiochip_add_pingroup_range(struct gpio_chip *chip, struct pinctrl_dev *pctldev, unsigned int gpio_offset, const char *pin_group) { WARN_ON(1); return -EINVAL; } |
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static inline void gpiochip_remove_pin_ranges(struct gpio_chip *chip) { |
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WARN_ON(1); |
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} |
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static inline int devm_gpio_request(struct device *dev, unsigned gpio, const char *label) { WARN_ON(1); return -EINVAL; } |
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static inline int devm_gpio_request_one(struct device *dev, unsigned gpio, unsigned long flags, const char *label) { WARN_ON(1); return -EINVAL; } |
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static inline void devm_gpio_free(struct device *dev, unsigned int gpio) { WARN_ON(1); } #endif /* ! CONFIG_GPIOLIB */ |
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#endif /* __LINUX_GPIO_H */ |