cregit-Linux how code gets into the kernel

Release 4.12 include/asm-generic/gpio.h

#ifndef _ASM_GENERIC_GPIO_H

#define _ASM_GENERIC_GPIO_H

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/of.h>

#ifdef CONFIG_GPIOLIB

#include <linux/compiler.h>
#include <linux/gpio/driver.h>
#include <linux/gpio/consumer.h>

/* 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).
 *
 * While the GPIO programming interface defines valid GPIO numbers
 * to be in the range 0..MAX_INT, this library restricts them to the
 * smaller range 0..ARCH_NR_GPIOS-1.
 *
 * ARCH_NR_GPIOS is somewhat arbitrary; it usually reflects the sum of
 * builtin/SoC GPIOs plus a number of GPIOs on expanders; the latter is
 * actually an estimate of a board-specific value.
 */

#ifndef ARCH_NR_GPIOS
#if defined(CONFIG_ARCH_NR_GPIO) && CONFIG_ARCH_NR_GPIO > 0

#define ARCH_NR_GPIOS CONFIG_ARCH_NR_GPIO
#else

#define ARCH_NR_GPIOS		512
#endif
#endif

/*
 * "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 number >= 0 && number < ARCH_NR_GPIOS; }

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struct device; struct gpio; struct seq_file; struct module; struct device_node; struct gpio_desc; /* caller holds gpio_lock *OR* gpio is marked as requested */
static inline struct gpio_chip *gpio_to_chip(unsigned gpio) { return gpiod_to_chip(gpio_to_desc(gpio)); }

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/* Always use the library code for GPIO management calls, * or when sleeping may be involved. */ extern int gpio_request(unsigned gpio, const char *label); extern void gpio_free(unsigned gpio);
static inline int gpio_direction_input(unsigned gpio) { return gpiod_direction_input(gpio_to_desc(gpio)); }

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static inline int gpio_direction_output(unsigned gpio, int value) { return gpiod_direction_output_raw(gpio_to_desc(gpio), value); }

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static inline int gpio_set_debounce(unsigned gpio, unsigned debounce) { return gpiod_set_debounce(gpio_to_desc(gpio), debounce); }

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static inline int gpio_get_value_cansleep(unsigned gpio) { return gpiod_get_raw_value_cansleep(gpio_to_desc(gpio)); }

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static inline void gpio_set_value_cansleep(unsigned gpio, int value) { return gpiod_set_raw_value_cansleep(gpio_to_desc(gpio), value); }

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/* A platform's <asm/gpio.h> code may want to inline the I/O calls when * the GPIO is constant and refers to some always-present controller, * giving direct access to chip registers and tight bitbanging loops. */
static inline int __gpio_get_value(unsigned gpio) { return gpiod_get_raw_value(gpio_to_desc(gpio)); }

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static inline void __gpio_set_value(unsigned gpio, int value) { return gpiod_set_raw_value(gpio_to_desc(gpio), value); }

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static inline int __gpio_cansleep(unsigned gpio) { return gpiod_cansleep(gpio_to_desc(gpio)); }

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static inline int __gpio_to_irq(unsigned gpio) { return gpiod_to_irq(gpio_to_desc(gpio)); }

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extern int gpio_request_one(unsigned gpio, unsigned long flags, const char *label); extern int gpio_request_array(const struct gpio *array, size_t num); extern void gpio_free_array(const struct gpio *array, size_t num); /* * A sysfs interface can be exported by individual drivers if they want, * but more typically is configured entirely from userspace. */
static inline int gpio_export(unsigned gpio, bool direction_may_change) { return gpiod_export(gpio_to_desc(gpio), direction_may_change); }

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static inline int gpio_export_link(struct device *dev, const char *name, unsigned gpio) { return gpiod_export_link(dev, name, gpio_to_desc(gpio)); }

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static inline void gpio_unexport(unsigned gpio) { gpiod_unexport(gpio_to_desc(gpio)); }

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#else /* !CONFIG_GPIOLIB */
static inline bool gpio_is_valid(int number) { /* only non-negative numbers are valid */ return number >= 0; }

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/* platforms that don't directly support access to GPIOs through I2C, SPI, * or other blocking infrastructure can use these wrappers. */
static inline int gpio_cansleep(unsigned gpio) { return 0; }

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static inline int gpio_get_value_cansleep(unsigned gpio) { might_sleep(); return __gpio_get_value(gpio); }

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static inline void gpio_set_value_cansleep(unsigned gpio, int value) { might_sleep(); __gpio_set_value(gpio, value); }

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#endif /* !CONFIG_GPIOLIB */ #endif /* _ASM_GENERIC_GPIO_H */

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