include/linux/gpio/legacy.h

Source file repositories/reference/linux-study-clean/include/linux/gpio/legacy.h

File Facts

System
Linux kernel
Corpus path
include/linux/gpio/legacy.h
Extension
.h
Size
3996 bytes
Lines
174
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef __LINUX_GPIO_LEGACY_H
#define __LINUX_GPIO_LEGACY_H

#include <linux/types.h>

#ifdef CONFIG_GPIOLIB_LEGACY

struct device;

/* make these flag values available regardless of GPIO kconfig options */
#define GPIOF_IN		((1 << 0))
#define GPIOF_OUT_INIT_LOW	((0 << 0) | (0 << 1))
#define GPIOF_OUT_INIT_HIGH	((0 << 0) | (1 << 1))

#ifdef CONFIG_GPIOLIB

#include <linux/gpio/consumer.h>

/*
 * "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)
{
	/* only non-negative numbers are valid */
	return number >= 0;
}

/*
 * 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).
 */

/* Always use the library code for GPIO management calls,
 * or when sleeping may be involved.
 */
int gpio_request(unsigned gpio, const char *label);
void gpio_free(unsigned gpio);

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

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

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

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

int gpio_request_one(unsigned gpio, unsigned long flags, const char *label);

int devm_gpio_request_one(struct device *dev, unsigned gpio,
			  unsigned long flags, const char *label);

#else /* ! CONFIG_GPIOLIB */

#include <linux/kernel.h>

#include <asm/bug.h>
#include <asm/errno.h>

static inline bool gpio_is_valid(int number)
{

Annotation

Implementation Notes