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