/* 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_ */