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_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 */ 51 static inline void gpiotools_set_bit(__u64 *b, int n) 52 { 53 *b |= _BITULL(n); 54 } 55 56 static inline void gpiotools_change_bit(__u64 *b, int n) 57 { 58 *b ^= _BITULL(n); 59 } 60 61 static inline void gpiotools_clear_bit(__u64 *b, int n) 62 { 63 *b &= ~_BITULL(n); 64 } 65 66 static inline int gpiotools_test_bit(__u64 b, int n) 67 { 68 return !!(b & _BITULL(n)); 69 } 70 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