74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* GPIO tools - utility helpers library for the GPIO tools
|
|
*
|
|
* Copyright (C) 2015 Linus Walleij
|
|
*
|
|
* Portions copied from iio_utils and lssio:
|
|
* Copyright (c) 2010 Manuel Stahl <manuel.stahl@iis.fraunhofer.de>
|
|
* Copyright (c) 2008 Jonathan Cameron
|
|
* *
|
|
*/
|
|
#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_ */
|