mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 22:53:55 +08:00
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>
44 lines
1.5 KiB
C
44 lines
1.5 KiB
C
/*
|
|
* GPIO tools - utility helpers library for the GPIO tools
|
|
*
|
|
* Copyright (C) 2015 Linus Walleij
|
|
*
|
|
* Portions copied from iio_utils and lssio:
|
|
* Copyright (c) 2010 Manuel Stahl <manuel.stahl@iis.fraunhofer.de>
|
|
* Copyright (c) 2008 Jonathan Cameron
|
|
* *
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published by
|
|
* the Free Software Foundation.
|
|
*/
|
|
#ifndef _GPIO_UTILS_H_
|
|
#define _GPIO_UTILS_H_
|
|
|
|
#include <string.h>
|
|
|
|
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
|
|
|
|
static inline int check_prefix(const char *str, const char *prefix)
|
|
{
|
|
return strlen(str) > strlen(prefix) &&
|
|
strncmp(str, prefix, strlen(prefix)) == 0;
|
|
}
|
|
|
|
int gpiotools_request_linehandle(const char *device_name, unsigned int *lines,
|
|
unsigned int nlines, unsigned int flag,
|
|
struct gpiohandle_data *data,
|
|
const char *consumer_label);
|
|
int gpiotools_set_values(const int fd, struct gpiohandle_data *data);
|
|
int gpiotools_get_values(const int fd, struct gpiohandle_data *data);
|
|
int gpiotools_release_linehandle(const int fd);
|
|
|
|
int gpiotools_get(const char *device_name, unsigned int line);
|
|
int gpiotools_gets(const char *device_name, unsigned int *lines,
|
|
unsigned int nlines, struct gpiohandle_data *data);
|
|
int gpiotools_set(const char *device_name, unsigned int line,
|
|
unsigned int value);
|
|
int gpiotools_sets(const char *device_name, unsigned int *lines,
|
|
unsigned int nlines, struct gpiohandle_data *data);
|
|
|
|
#endif /* _GPIO_UTILS_H_ */
|