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/* 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_ */
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