tools/gpio/gpio-utils.h

   1 /*
   2  * GPIO tools - utility helpers library for the GPIO tools
   3  *
   4  * Copyright (C) 2015 Linus Walleij
   5  *
   6  * Portions copied from iio_utils and lssio:
   7  * Copyright (c) 2010 Manuel Stahl <manuel.stahl@iis.fraunhofer.de>
   8  * Copyright (c) 2008 Jonathan Cameron
   9  * *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License version 2 as published by
  12  * the Free Software Foundation.
  13  */
  14 #ifndef _GPIO_UTILS_H_
  15 #define _GPIO_UTILS_H_
  16
  17 #include <string.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 nlines, unsigned int flag,
  29                                  struct gpiohandle_data *data,
  30                                  const char *consumer_label);
  31 int gpiotools_set_values(const int fd, struct gpiohandle_data *data);
  32 int gpiotools_get_values(const int fd, struct gpiohandle_data *data);
  33 int gpiotools_release_linehandle(const int fd);
  34
  35 int gpiotools_get(const char *device_name, unsigned int line);
  36 int gpiotools_gets(const char *device_name, unsigned int *lines,
  37                    unsigned int nlines, struct gpiohandle_data *data);
  38 int gpiotools_set(const char *device_name, unsigned int line,
  39                   unsigned int value);
  40 int gpiotools_sets(const char *device_name, unsigned int *lines,
  41                    unsigned int nlines, struct gpiohandle_data *data);
  42
  43 #endif /* _GPIO_UTILS_H_ */