tools/iio/iio_utils.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 #ifndef _IIO_UTILS_H_
   3 #define _IIO_UTILS_H_
   4
   5 /* IIO - useful set of util functionality
   6  *
   7  * Copyright (c) 2008 Jonathan Cameron
   8  */
   9
  10 #include <stdint.h>
  11
  12 /* Made up value to limit allocation sizes */
  13 #define IIO_MAX_NAME_LENGTH 64
  14
  15 #define FORMAT_SCAN_ELEMENTS_DIR "%s/scan_elements"
  16 #define FORMAT_TYPE_FILE "%s_type"
  17
  18 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
  19
  20 extern const char *iio_dir;
  21
  22 /**
  23  * struct iio_channel_info - information about a given channel
  24  * @name: channel name
  25  * @generic_name: general name for channel type
  26  * @scale: scale factor to be applied for conversion to si units
  27  * @offset: offset to be applied for conversion to si units
  28  * @index: the channel index in the buffer output
  29  * @bytes: number of bytes occupied in buffer output
  30  * @bits_used: number of valid bits of data
  31  * @shift: amount of bits to shift right data before applying bit mask
  32  * @mask: a bit mask for the raw output
  33  * @be: flag if data is big endian
  34  * @is_signed: is the raw value stored signed
  35  * @location: data offset for this channel inside the buffer (in bytes)
  36  **/
  37 struct iio_channel_info {
  38         char *name;
  39         char *generic_name;
  40         float scale;
  41         float offset;
  42         unsigned index;
  43         unsigned bytes;
  44         unsigned bits_used;
  45         unsigned shift;
  46         uint64_t mask;
  47         unsigned be;
  48         unsigned is_signed;
  49         unsigned location;
  50 };
  51
  52 static inline int iioutils_check_suffix(const char *str, const char *suffix)
  53 {
  54         return strlen(str) >= strlen(suffix) &&
  55                 strncmp(str+strlen(str)-strlen(suffix),
  56                         suffix, strlen(suffix)) == 0;
  57 }
  58
  59 int iioutils_break_up_name(const char *full_name, char **generic_name);
  60 int iioutils_get_type(unsigned *is_signed, unsigned *bytes, unsigned *bits_used,
  61                       unsigned *shift, uint64_t *mask, unsigned *be,
  62                       const char *device_dir, const char *name,
  63                       const char *generic_name);
  64 int iioutils_get_param_float(float *output, const char *param_name,
  65                              const char *device_dir, const char *name,
  66                              const char *generic_name);
  67 void bsort_channel_array_by_index(struct iio_channel_info *ci_array, int cnt);
  68 int build_channel_array(const char *device_dir,
  69                         struct iio_channel_info **ci_array, int *counter);
  70 int find_type_by_name(const char *name, const char *type);
  71 int write_sysfs_int(const char *filename, const char *basedir, int val);
  72 int write_sysfs_int_and_verify(const char *filename, const char *basedir,
  73                                int val);
  74 int write_sysfs_string_and_verify(const char *filename, const char *basedir,
  75                                   const char *val);
  76 int write_sysfs_string(const char *filename, const char *basedir,
  77                        const char *val);
  78 int read_sysfs_posint(const char *filename, const char *basedir);
  79 int read_sysfs_float(const char *filename, const char *basedir, float *val);
  80 int read_sysfs_string(const char *filename, const char *basedir, char *str);
  81
  82 #endif /* _IIO_UTILS_H_ */