LXR linux/tools/gpio/gpio-utils.h

   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 <string.h>
  16
  17#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
  18
  19static inline int check_prefix(const char *str, const char *prefix)
  20{
  21        return strlen(str) > strlen(prefix) &&
  22                strncmp(str, prefix, strlen(prefix)) == 0;
  23}
  24
  25int gpiotools_request_linehandle(const char *device_name, unsigned int *lines,
  26                                 unsigned int nlines, unsigned int flag,
  27                                 struct gpiohandle_data *data,
  28                                 const char *consumer_label);
  29int gpiotools_set_values(const int fd, struct gpiohandle_data *data);
  30int gpiotools_get_values(const int fd, struct gpiohandle_data *data);
  31int gpiotools_release_linehandle(const int fd);
  32
  33int gpiotools_get(const char *device_name, unsigned int line);
  34int gpiotools_gets(const char *device_name, unsigned int *lines,
  35                   unsigned int nlines, struct gpiohandle_data *data);
  36int gpiotools_set(const char *device_name, unsigned int line,
  37                  unsigned int value);
  38int gpiotools_sets(const char *device_name, unsigned int *lines,
  39                   unsigned int nlines, struct gpiohandle_data *data);
  40
  41#endif /* _GPIO_UTILS_H_ */
  42