1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * GPIO tools - utility helpers library for the GPIO tools
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2015 Linus Walleij
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Portions copied from iio_utils and lssio:
8*4882a593Smuzhiyun * Copyright (c) 2010 Manuel Stahl <manuel.stahl@iis.fraunhofer.de>
9*4882a593Smuzhiyun * Copyright (c) 2008 Jonathan Cameron
10*4882a593Smuzhiyun * *
11*4882a593Smuzhiyun */
12*4882a593Smuzhiyun #ifndef _GPIO_UTILS_H_
13*4882a593Smuzhiyun #define _GPIO_UTILS_H_
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #include <stdbool.h>
16*4882a593Smuzhiyun #include <string.h>
17*4882a593Smuzhiyun #include <linux/types.h>
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
20*4882a593Smuzhiyun
check_prefix(const char * str,const char * prefix)21*4882a593Smuzhiyun static inline int check_prefix(const char *str, const char *prefix)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun return strlen(str) > strlen(prefix) &&
24*4882a593Smuzhiyun strncmp(str, prefix, strlen(prefix)) == 0;
25*4882a593Smuzhiyun }
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun int gpiotools_request_linehandle(const char *device_name, unsigned int *lines,
28*4882a593Smuzhiyun unsigned int num_lines, unsigned int flag,
29*4882a593Smuzhiyun struct gpiohandle_data *data,
30*4882a593Smuzhiyun const char *consumer_label);
31*4882a593Smuzhiyun int gpiotools_release_linehandle(const int fd);
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun int gpiotools_request_line(const char *device_name,
34*4882a593Smuzhiyun unsigned int *lines,
35*4882a593Smuzhiyun unsigned int num_lines,
36*4882a593Smuzhiyun struct gpio_v2_line_config *config,
37*4882a593Smuzhiyun const char *consumer);
38*4882a593Smuzhiyun int gpiotools_set_values(const int fd, struct gpio_v2_line_values *values);
39*4882a593Smuzhiyun int gpiotools_get_values(const int fd, struct gpio_v2_line_values *values);
40*4882a593Smuzhiyun int gpiotools_release_line(const int fd);
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun int gpiotools_get(const char *device_name, unsigned int line);
43*4882a593Smuzhiyun int gpiotools_gets(const char *device_name, unsigned int *lines,
44*4882a593Smuzhiyun unsigned int num_lines, unsigned int *values);
45*4882a593Smuzhiyun int gpiotools_set(const char *device_name, unsigned int line,
46*4882a593Smuzhiyun unsigned int value);
47*4882a593Smuzhiyun int gpiotools_sets(const char *device_name, unsigned int *lines,
48*4882a593Smuzhiyun unsigned int num_lines, unsigned int *values);
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun /* helper functions for gpio_v2_line_values bits */
gpiotools_set_bit(__u64 * b,int n)51*4882a593Smuzhiyun static inline void gpiotools_set_bit(__u64 *b, int n)
52*4882a593Smuzhiyun {
53*4882a593Smuzhiyun *b |= _BITULL(n);
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
gpiotools_change_bit(__u64 * b,int n)56*4882a593Smuzhiyun static inline void gpiotools_change_bit(__u64 *b, int n)
57*4882a593Smuzhiyun {
58*4882a593Smuzhiyun *b ^= _BITULL(n);
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
gpiotools_clear_bit(__u64 * b,int n)61*4882a593Smuzhiyun static inline void gpiotools_clear_bit(__u64 *b, int n)
62*4882a593Smuzhiyun {
63*4882a593Smuzhiyun *b &= ~_BITULL(n);
64*4882a593Smuzhiyun }
65*4882a593Smuzhiyun
gpiotools_test_bit(__u64 b,int n)66*4882a593Smuzhiyun static inline int gpiotools_test_bit(__u64 b, int n)
67*4882a593Smuzhiyun {
68*4882a593Smuzhiyun return !!(b & _BITULL(n));
69*4882a593Smuzhiyun }
70*4882a593Smuzhiyun
gpiotools_assign_bit(__u64 * b,int n,bool value)71*4882a593Smuzhiyun static inline void gpiotools_assign_bit(__u64 *b, int n, bool value)
72*4882a593Smuzhiyun {
73*4882a593Smuzhiyun if (value)
74*4882a593Smuzhiyun gpiotools_set_bit(b, n);
75*4882a593Smuzhiyun else
76*4882a593Smuzhiyun gpiotools_clear_bit(b, n);
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun #endif /* _GPIO_UTILS_H_ */
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