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
21 static 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 int 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);
32 int gpiotools_set_values(const int fd, struct gpio_v2_line_values *values);
33 int gpiotools_get_values(const int fd, struct gpio_v2_line_values *values);
34 int gpiotools_release_line(const int fd);
35
36 int gpiotools_get(const char *device_name, unsigned int line);
37 int gpiotools_gets(const char *device_name, unsigned int *lines,
38 unsigned int num_lines, unsigned int *values);
39 int gpiotools_set(const char *device_name, unsigned int line,
40 unsigned int value);
41 int 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 */
45 static inline void gpiotools_set_bit(__u64 *b, int n)
46 {
47 *b |= _BITULL(n);
48 }
49
50 static inline void gpiotools_change_bit(__u64 *b, int n)
51 {
52 *b ^= _BITULL(n);
53 }
54
55 static inline void gpiotools_clear_bit(__u64 *b, int n)
56 {
57 *b &= ~_BITULL(n);
58 }
59
60 static inline int gpiotools_test_bit(__u64 b, int n)
61 {
62 return !!(b & _BITULL(n));
63 }
64
65 static 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_ */
74
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