tools/iio/iio_utils.h

   1 #ifndef _IIO_UTILS_H_
   2 #define _IIO_UTILS_H_
   3
   4 /* IIO - useful set of util functionality
   5  *
   6  * Copyright (c) 2008 Jonathan Cameron
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License version 2 as published by
  10  * the Free Software Foundation.
  11  */
  12
  13 #include <stdint.h>
  14
  15 /* Made up value to limit allocation sizes */
  16 #define IIO_MAX_NAME_LENGTH 30
  17
  18 #define FORMAT_SCAN_ELEMENTS_DIR "%s/scan_elements"
  19 #define FORMAT_TYPE_FILE "%s_type"
  20
  21 extern const char *iio_dir;
  22
  23 /**
  24  * struct iio_channel_info - information about a given channel
  25  * @name: channel name
  26  * @generic_name: general name for channel type
  27  * @scale: scale factor to be applied for conversion to si units
  28  * @offset: offset to be applied for conversion to si units
  29  * @index: the channel index in the buffer output
  30  * @bytes: number of bytes occupied in buffer output
  31  * @bits_used: number of valid bits of data
  32  * @shift: amount of bits to shift right data before applying bit mask
  33  * @mask: a bit mask for the raw output
  34  * @be: flag if data is big endian
  35  * @is_signed: is the raw value stored signed
  36  * @location: data offset for this channel inside the buffer (in bytes)
  37  **/
  38 struct iio_channel_info {
  39         char *name;
  40         char *generic_name;
  41         float scale;
  42         float offset;
  43         unsigned index;
  44         unsigned bytes;
  45         unsigned bits_used;
  46         unsigned shift;
  47         uint64_t mask;
  48         unsigned be;
  49         unsigned is_signed;
  50         unsigned location;
  51 };
  52
  53 int iioutils_break_up_name(const char *full_name, char **generic_name);
  54 int iioutils_get_type(unsigned *is_signed, unsigned *bytes,
  55                                           unsigned *bits_used, unsigned *shift,
  56                                           uint64_t *mask, unsigned *be,
  57                                           const char *device_dir, const char *name,
  58                                           const char *generic_name);
  59 int iioutils_get_param_float(float *output, const char *param_name,
  60                                                          const char *device_dir, const char *name,
  61                                                          const char *generic_name);
  62 void bsort_channel_array_by_index(struct iio_channel_info **ci_array, int cnt);
  63 int build_channel_array(const char *device_dir,
  64                                                 struct iio_channel_info **ci_array, int *counter);
  65 int find_type_by_name(const char *name, const char *type);
  66 int write_sysfs_int(char *filename, char *basedir, int val);
  67 int write_sysfs_int_and_verify(char *filename, char *basedir, int val);
  68 int write_sysfs_string_and_verify(char *filename, char *basedir, char *val);
  69 int write_sysfs_string(char *filename, char *basedir, char *val);
  70 int read_sysfs_posint(char *filename, char *basedir);
  71 int read_sysfs_float(char *filename, char *basedir, float *val);
  72 int read_sysfs_string(const char *filename, const char *basedir, char *str);
  73
  74 #endif /* _IIO_UTILS_H_ */