1/*
 2 * GPIO tools - utility helpers library for the GPIO tools
 3 *
 4 * Copyright (C) 2015 Linus Walleij
 5 *
 6 * Portions copied from iio_utils and lssio:
 7 * Copyright (c) 2010 Manuel Stahl <manuel.stahl@iis.fraunhofer.de>
 8 * Copyright (c) 2008 Jonathan Cameron
 9 * *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published by
12 * the Free Software Foundation.
13 */
14#ifndef _GPIO_UTILS_H_
15#define _GPIO_UTILS_H_
16
 
17#include <string.h>
 
18
19#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
20
21static inline int check_prefix(const char *str, const char *prefix)
22{
23	return strlen(str) > strlen(prefix) &&
24		strncmp(str, prefix, strlen(prefix)) == 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
25}
26
27#endif /* _GPIO_UTILS_H_ */

 1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * GPIO tools - utility helpers library for the GPIO tools
 4 *
 5 * Copyright (C) 2015 Linus Walleij
 6 *
 7 * Portions copied from iio_utils and lssio:
 8 * Copyright (c) 2010 Manuel Stahl <manuel.stahl@iis.fraunhofer.de>
 9 * Copyright (c) 2008 Jonathan Cameron
10 * *
 
 
 
11 */
12#ifndef _GPIO_UTILS_H_
13#define _GPIO_UTILS_H_
14
15#include <stdbool.h>
16#include <string.h>
17#include <linux/types.h>
18
19#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
20
21static inline int check_prefix(const char *str, const char *prefix)
22{
23	return strlen(str) > strlen(prefix) &&
24		strncmp(str, prefix, strlen(prefix)) == 0;
25}
26
27int gpiotools_request_line(const char *device_name,
28			   unsigned int *lines,
29			   unsigned int num_lines,
30			   struct gpio_v2_line_config *config,
31			   const char *consumer);
32int gpiotools_set_values(const int fd, struct gpio_v2_line_values *values);
33int gpiotools_get_values(const int fd, struct gpio_v2_line_values *values);
34int gpiotools_release_line(const int fd);
35
36int gpiotools_get(const char *device_name, unsigned int line);
37int gpiotools_gets(const char *device_name, unsigned int *lines,
38		   unsigned int num_lines, unsigned int *values);
39int gpiotools_set(const char *device_name, unsigned int line,
40		  unsigned int value);
41int gpiotools_sets(const char *device_name, unsigned int *lines,
42		   unsigned int num_lines, unsigned int *values);
43
44/* helper functions for gpio_v2_line_values bits */
45static inline void gpiotools_set_bit(__u64 *b, int n)
46{
47	*b |= _BITULL(n);
48}
49
50static inline void gpiotools_change_bit(__u64 *b, int n)
51{
52	*b ^= _BITULL(n);
53}
54
55static inline void gpiotools_clear_bit(__u64 *b, int n)
56{
57	*b &= ~_BITULL(n);
58}
59
60static inline int gpiotools_test_bit(__u64 b, int n)
61{
62	return !!(b & _BITULL(n));
63}
64
65static inline void gpiotools_assign_bit(__u64 *b, int n, bool value)
66{
67	if (value)
68		gpiotools_set_bit(b, n);
69	else
70		gpiotools_clear_bit(b, n);
71}
72
73#endif /* _GPIO_UTILS_H_ */