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