mirror of https://gitee.com/openkylin/linux.git
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* GPIO tools - utility helpers library for the GPIO tools
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*
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* Copyright (C) 2015 Linus Walleij
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*
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* Portions copied from iio_utils and lssio:
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* Copyright (c) 2010 Manuel Stahl <manuel.stahl@iis.fraunhofer.de>
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* Copyright (c) 2008 Jonathan Cameron
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* *
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*/
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#ifndef _GPIO_UTILS_H_
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#define _GPIO_UTILS_H_
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#include <stdbool.h>
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#include <string.h>
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#include <linux/types.h>
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#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
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static inline int check_prefix(const char *str, const char *prefix)
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{
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return strlen(str) > strlen(prefix) &&
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strncmp(str, prefix, strlen(prefix)) == 0;
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}
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int gpiotools_request_line(const char *device_name,
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unsigned int *lines,
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unsigned int num_lines,
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struct gpio_v2_line_config *config,
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const char *consumer);
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int gpiotools_set_values(const int fd, struct gpio_v2_line_values *values);
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int gpiotools_get_values(const int fd, struct gpio_v2_line_values *values);
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int gpiotools_release_line(const int fd);
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int gpiotools_get(const char *device_name, unsigned int line);
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int gpiotools_gets(const char *device_name, unsigned int *lines,
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unsigned int num_lines, unsigned int *values);
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int gpiotools_set(const char *device_name, unsigned int line,
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unsigned int value);
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int gpiotools_sets(const char *device_name, unsigned int *lines,
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unsigned int num_lines, unsigned int *values);
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/* helper functions for gpio_v2_line_values bits */
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static inline void gpiotools_set_bit(__u64 *b, int n)
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{
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*b |= _BITULL(n);
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}
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static inline void gpiotools_change_bit(__u64 *b, int n)
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{
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*b ^= _BITULL(n);
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}
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static inline void gpiotools_clear_bit(__u64 *b, int n)
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{
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*b &= ~_BITULL(n);
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}
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static inline int gpiotools_test_bit(__u64 b, int n)
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{
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return !!(b & _BITULL(n));
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}
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static inline void gpiotools_assign_bit(__u64 *b, int n, bool value)
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{
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if (value)
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gpiotools_set_bit(b, n);
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else
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gpiotools_clear_bit(b, n);
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}
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#endif /* _GPIO_UTILS_H_ */
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