tools/gpio/gpio-utils.h

Source file repositories/reference/linux-study-clean/tools/gpio/gpio-utils.h

File Facts

System
Linux kernel
Corpus path
tools/gpio/gpio-utils.h
Extension
.h
Size
1953 bytes
Lines
74
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _GPIO_UTILS_H_
#define _GPIO_UTILS_H_

#include <stdbool.h>
#include <string.h>
#include <linux/types.h>

#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))

static inline int check_prefix(const char *str, const char *prefix)
{
	return strlen(str) > strlen(prefix) &&
		strncmp(str, prefix, strlen(prefix)) == 0;
}

int gpiotools_request_line(const char *device_name,
			   unsigned int *lines,
			   unsigned int num_lines,
			   struct gpio_v2_line_config *config,
			   const char *consumer);
int gpiotools_set_values(const int fd, struct gpio_v2_line_values *values);
int gpiotools_get_values(const int fd, struct gpio_v2_line_values *values);
int gpiotools_release_line(const int fd);

int gpiotools_get(const char *device_name, unsigned int line);
int gpiotools_gets(const char *device_name, unsigned int *lines,
		   unsigned int num_lines, unsigned int *values);
int gpiotools_set(const char *device_name, unsigned int line,
		  unsigned int value);
int gpiotools_sets(const char *device_name, unsigned int *lines,
		   unsigned int num_lines, unsigned int *values);

/* helper functions for gpio_v2_line_values bits */
static inline void gpiotools_set_bit(__u64 *b, int n)
{
	*b |= _BITULL(n);
}

static inline void gpiotools_change_bit(__u64 *b, int n)
{
	*b ^= _BITULL(n);
}

static inline void gpiotools_clear_bit(__u64 *b, int n)
{
	*b &= ~_BITULL(n);
}

static inline int gpiotools_test_bit(__u64 b, int n)
{
	return !!(b & _BITULL(n));
}

static inline void gpiotools_assign_bit(__u64 *b, int n, bool value)
{
	if (value)
		gpiotools_set_bit(b, n);
	else
		gpiotools_clear_bit(b, n);
}

#endif /* _GPIO_UTILS_H_ */

Annotation

Implementation Notes