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
  19 static 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
  25 int 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);
  29 int gpiotools_set_values(const int fd, struct gpiohandle_data *data);
  30 int gpiotools_get_values(const int fd, struct gpiohandle_data *data);
  31 int gpiotools_release_linehandle(const int fd);
  32
  33 int gpiotools_get(const char *device_name, unsigned int line);
  34 int gpiotools_gets(const char *device_name, unsigned int *lines,
  35                    unsigned int nlines, struct gpiohandle_data *data);
  36 int gpiotools_set(const char *device_name, unsigned int line,
  37                   unsigned int value);
  38 int gpiotools_sets(const char *device_name, unsigned int *lines,
  39                    unsigned int nlines, struct gpiohandle_data *data);
  40
  41 #endif /* _GPIO_UTILS_H_ */