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
check_prefix(const char * str,const char * prefix)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_linehandle(const char *device_name, unsigned int *lines,
28 unsigned int num_lines, unsigned int flag,
29 struct gpiohandle_data *data,
30 const char *consumer_label);
31 int gpiotools_release_linehandle(const int fd);
32
33 int gpiotools_request_line(const char *device_name,
34 unsigned int *lines,
35 unsigned int num_lines,
36 struct gpio_v2_line_config *config,
37 const char *consumer);
38 int gpiotools_set_values(const int fd, struct gpio_v2_line_values *values);
39 int gpiotools_get_values(const int fd, struct gpio_v2_line_values *values);
40 int gpiotools_release_line(const int fd);
41
42 int gpiotools_get(const char *device_name, unsigned int line);
43 int gpiotools_gets(const char *device_name, unsigned int *lines,
44 unsigned int num_lines, unsigned int *values);
45 int gpiotools_set(const char *device_name, unsigned int line,
46 unsigned int value);
47 int gpiotools_sets(const char *device_name, unsigned int *lines,
48 unsigned int num_lines, unsigned int *values);
49
50 /* helper functions for gpio_v2_line_values bits */
gpiotools_set_bit(__u64 * b,int n)51 static inline void gpiotools_set_bit(__u64 *b, int n)
52 {
53 *b |= _BITULL(n);
54 }
55
gpiotools_change_bit(__u64 * b,int n)56 static inline void gpiotools_change_bit(__u64 *b, int n)
57 {
58 *b ^= _BITULL(n);
59 }
60
gpiotools_clear_bit(__u64 * b,int n)61 static inline void gpiotools_clear_bit(__u64 *b, int n)
62 {
63 *b &= ~_BITULL(n);
64 }
65
gpiotools_test_bit(__u64 b,int n)66 static inline int gpiotools_test_bit(__u64 b, int n)
67 {
68 return !!(b & _BITULL(n));
69 }
70
gpiotools_assign_bit(__u64 * b,int n,bool value)71 static inline void gpiotools_assign_bit(__u64 *b, int n, bool value)
72 {
73 if (value)
74 gpiotools_set_bit(b, n);
75 else
76 gpiotools_clear_bit(b, n);
77 }
78
79 #endif /* _GPIO_UTILS_H_ */
80