230 lines
5.4 KiB
C
230 lines
5.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* <linux/gpio.h>
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*
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* This is the LEGACY GPIO bulk include file, including legacy APIs. It is
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* used for GPIO drivers still referencing the global GPIO numberspace,
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* and should not be included in new code.
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*
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* If you're implementing a GPIO driver, only include <linux/gpio/driver.h>
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* If you're implementing a GPIO consumer, only include <linux/gpio/consumer.h>
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*/
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#ifndef __LINUX_GPIO_H
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#define __LINUX_GPIO_H
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#include <linux/types.h>
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struct device;
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/* see Documentation/driver-api/gpio/legacy.rst */
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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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/**
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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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#include <linux/gpio/consumer.h>
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/*
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* "valid" GPIO numbers are nonnegative and may be passed to
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* setup routines like gpio_request(). Only some valid numbers
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* can successfully be requested and used.
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*
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* Invalid GPIO numbers are useful for indicating no-such-GPIO in
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* platform data and other tables.
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*/
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static inline bool gpio_is_valid(int number)
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{
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/* only non-negative numbers are valid */
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return number >= 0;
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}
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/*
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* Platforms may implement their GPIO interface with library code,
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* at a small performance cost for non-inlined operations and some
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* extra memory (for code and for per-GPIO table entries).
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*/
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/*
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* At the end we want all GPIOs to be dynamically allocated from 0.
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* However, some legacy drivers still perform fixed allocation.
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* Until they are all fixed, leave 0-512 space for them.
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*/
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#define GPIO_DYNAMIC_BASE 512
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/* Always use the library code for GPIO management calls,
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* or when sleeping may be involved.
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*/
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int gpio_request(unsigned gpio, const char *label);
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void gpio_free(unsigned gpio);
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static inline int gpio_direction_input(unsigned gpio)
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{
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return gpiod_direction_input(gpio_to_desc(gpio));
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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 gpiod_direction_output_raw(gpio_to_desc(gpio), value);
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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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return gpiod_get_raw_value_cansleep(gpio_to_desc(gpio));
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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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return gpiod_set_raw_value_cansleep(gpio_to_desc(gpio), value);
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}
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static inline int gpio_get_value(unsigned gpio)
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{
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return gpiod_get_raw_value(gpio_to_desc(gpio));
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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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return gpiod_set_raw_value(gpio_to_desc(gpio), value);
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}
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static inline int gpio_to_irq(unsigned gpio)
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{
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return gpiod_to_irq(gpio_to_desc(gpio));
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}
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int gpio_request_one(unsigned gpio, unsigned long flags, const char *label);
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int gpio_request_array(const struct gpio *array, size_t num);
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void gpio_free_array(const struct gpio *array, size_t num);
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/* CONFIG_GPIOLIB: bindings for managed devices that want to request gpios */
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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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#else /* ! CONFIG_GPIOLIB */
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#include <linux/kernel.h>
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#include <asm/bug.h>
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#include <asm/errno.h>
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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_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_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_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 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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#endif /* ! CONFIG_GPIOLIB */
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#endif /* __LINUX_GPIO_H */
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