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https://github.com/torvalds/linux
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e1acec0e75
Add basic gpio operations. User could get/set gpio value for specific line of gpiochip. Reference "tools/gpio/gpio-hammer.c" or "tools/testing/selftest/gpio/gpio-mockup-chardev.c" for how to use it. Signed-off-by: Bamvor Jian Zhang <bamvor.zhangjian@linaro.org> Reviewed-by: Michael Welling <mwelling@ieee.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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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 <string.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_linehandle(const char *device_name, unsigned int *lines,
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unsigned int nlines, unsigned int flag,
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struct gpiohandle_data *data,
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const char *consumer_label);
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int gpiotools_set_values(const int fd, struct gpiohandle_data *data);
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int gpiotools_get_values(const int fd, struct gpiohandle_data *data);
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int gpiotools_release_linehandle(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 nlines, struct gpiohandle_data *data);
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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 nlines, struct gpiohandle_data *data);
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#endif /* _GPIO_UTILS_H_ */
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