285 lines
5.8 KiB
C
285 lines
5.8 KiB
C
#ifndef __LINUX_GPIO_H
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#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 */
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#define GPIOF_DIR_OUT (0 << 0)
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#define GPIOF_DIR_IN (1 << 0)
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#define GPIOF_INIT_LOW (0 << 1)
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#define GPIOF_INIT_HIGH (1 << 1)
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#define GPIOF_IN (GPIOF_DIR_IN)
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#define GPIOF_OUT_INIT_LOW (GPIOF_DIR_OUT | GPIOF_INIT_LOW)
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#define GPIOF_OUT_INIT_HIGH (GPIOF_DIR_OUT | GPIOF_INIT_HIGH)
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/* Gpio pin is active-low */
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#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)
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#define GPIOF_EXPORT_CHANGEABLE (1 << 6)
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#define GPIOF_EXPORT_DIR_FIXED (GPIOF_EXPORT)
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#define GPIOF_EXPORT_DIR_CHANGEABLE (GPIOF_EXPORT | GPIOF_EXPORT_CHANGEABLE)
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/**
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* struct gpio - a structure describing a GPIO with configuration
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* @gpio: the GPIO number
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* @flags: GPIO configuration as specified by GPIOF_*
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* @label: a literal description string of this GPIO
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*/
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struct gpio {
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unsigned gpio;
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unsigned long flags;
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const char *label;
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};
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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
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#include <asm-generic/gpio.h>
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static inline int gpio_get_value(unsigned int gpio)
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{
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return __gpio_get_value(gpio);
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}
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static inline void gpio_set_value(unsigned int gpio, int value)
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{
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__gpio_set_value(gpio, value);
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}
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static inline int gpio_cansleep(unsigned int gpio)
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{
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return __gpio_cansleep(gpio);
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}
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static inline int gpio_to_irq(unsigned int gpio)
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{
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return __gpio_to_irq(gpio);
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}
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static inline int irq_to_gpio(unsigned int irq)
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{
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return -EINVAL;
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}
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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 */
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struct device;
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int devm_gpio_request(struct device *dev, unsigned gpio, const char *label);
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int devm_gpio_request_one(struct device *dev, unsigned gpio,
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unsigned long flags, const char *label);
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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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{
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return -ENOSYS;
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}
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static inline int gpio_request_one(unsigned gpio,
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unsigned long flags, const char *label)
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{
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return -ENOSYS;
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}
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static inline int gpio_request_array(const struct gpio *array, size_t num)
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{
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return -ENOSYS;
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}
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static inline void gpio_free(unsigned gpio)
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{
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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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}
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static inline void gpio_free_array(const struct gpio *array, size_t num)
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{
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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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}
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static inline int gpio_direction_input(unsigned gpio)
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{
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return -ENOSYS;
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}
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static inline int gpio_direction_output(unsigned gpio, int value)
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{
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return -ENOSYS;
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}
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static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
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{
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return -ENOSYS;
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}
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static inline int gpio_get_value(unsigned gpio)
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{
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/* GPIO can never have been requested or set as {in,out}put */
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WARN_ON(1);
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return 0;
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}
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static inline void gpio_set_value(unsigned gpio, int value)
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{
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/* GPIO can never have been requested or set as output */
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WARN_ON(1);
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}
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static inline int gpio_cansleep(unsigned gpio)
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{
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/* GPIO can never have been requested or set as {in,out}put */
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WARN_ON(1);
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return 0;
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}
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static inline int gpio_get_value_cansleep(unsigned gpio)
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{
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/* GPIO can never have been requested or set as {in,out}put */
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WARN_ON(1);
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return 0;
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}
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static inline void gpio_set_value_cansleep(unsigned gpio, int value)
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{
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/* GPIO can never have been requested or set as output */
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WARN_ON(1);
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}
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static inline int gpio_export(unsigned gpio, bool direction_may_change)
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{
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/* GPIO can never have been requested or set as {in,out}put */
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WARN_ON(1);
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return -EINVAL;
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}
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static inline int gpio_export_link(struct device *dev, const char *name,
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unsigned gpio)
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{
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/* GPIO can never have been exported */
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WARN_ON(1);
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return -EINVAL;
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}
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static inline int gpio_sysfs_set_active_low(unsigned gpio, int value)
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{
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/* GPIO can never have been requested */
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WARN_ON(1);
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return -EINVAL;
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}
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static inline void gpio_unexport(unsigned gpio)
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{
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/* GPIO can never have been exported */
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WARN_ON(1);
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}
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static inline int gpio_to_irq(unsigned gpio)
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{
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/* GPIO can never have been requested or set as input */
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WARN_ON(1);
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return -EINVAL;
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}
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static inline int gpiochip_lock_as_irq(struct gpio_chip *chip,
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unsigned int offset)
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{
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WARN_ON(1);
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return -EINVAL;
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}
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static inline void gpiochip_unlock_as_irq(struct gpio_chip *chip,
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unsigned int offset)
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{
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WARN_ON(1);
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}
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static inline int irq_to_gpio(unsigned irq)
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{
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/* irq can never have been returned from gpio_to_irq() */
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WARN_ON(1);
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return -EINVAL;
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}
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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);
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return -EINVAL;
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}
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static inline int
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gpiochip_add_pingroup_range(struct gpio_chip *chip,
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struct pinctrl_dev *pctldev,
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unsigned int gpio_offset, const char *pin_group)
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{
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WARN_ON(1);
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return -EINVAL;
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}
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static inline void
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gpiochip_remove_pin_ranges(struct gpio_chip *chip)
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{
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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,
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const char *label)
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{
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WARN_ON(1);
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return -EINVAL;
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}
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static inline int devm_gpio_request_one(struct device *dev, unsigned gpio,
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unsigned long flags, const char *label)
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{
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WARN_ON(1);
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return -EINVAL;
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}
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static inline void devm_gpio_free(struct device *dev, unsigned int gpio)
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{
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WARN_ON(1);
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}
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#endif /* ! CONFIG_GPIOLIB */
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#endif /* __LINUX_GPIO_H */
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