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 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0])) 22 23 extern const char *iio_dir; 24 25 /** 26 * struct iio_channel_info - information about a given channel 27 * @name: channel name 28 * @generic_name: general name for channel type 29 * @scale: scale factor to be applied for conversion to si units 30 * @offset: offset to be applied for conversion to si units 31 * @index: the channel index in the buffer output 32 * @bytes: number of bytes occupied in buffer output 33 * @bits_used: number of valid bits of data 34 * @shift: amount of bits to shift right data before applying bit mask 35 * @mask: a bit mask for the raw output 36 * @be: flag if data is big endian 37 * @is_signed: is the raw value stored signed 38 * @location: data offset for this channel inside the buffer (in bytes) 39 **/ 40 struct iio_channel_info { 41 char *name; 42 char *generic_name; 43 float scale; 44 float offset; 45 unsigned index; 46 unsigned bytes; 47 unsigned bits_used; 48 unsigned shift; 49 uint64_t mask; 50 unsigned be; 51 unsigned is_signed; 52 unsigned location; 53 }; 54 55 static inline int iioutils_check_suffix(const char *str, const char *suffix) 56 { 57 return strlen(str) >= strlen(suffix) && 58 strncmp(str+strlen(str)-strlen(suffix), 59 suffix, strlen(suffix)) == 0; 60 } 61 62 int iioutils_break_up_name(const char *full_name, char **generic_name); 63 int iioutils_get_type(unsigned *is_signed, unsigned *bytes, unsigned *bits_used, 64 unsigned *shift, uint64_t *mask, unsigned *be, 65 const char *device_dir, const char *name, 66 const char *generic_name); 67 int iioutils_get_param_float(float *output, const char *param_name, 68 const char *device_dir, const char *name, 69 const char *generic_name); 70 void bsort_channel_array_by_index(struct iio_channel_info *ci_array, int cnt); 71 int build_channel_array(const char *device_dir, 72 struct iio_channel_info **ci_array, int *counter); 73 int find_type_by_name(const char *name, const char *type); 74 int write_sysfs_int(const char *filename, const char *basedir, int val); 75 int write_sysfs_int_and_verify(const char *filename, const char *basedir, 76 int val); 77 int write_sysfs_string_and_verify(const char *filename, const char *basedir, 78 const char *val); 79 int write_sysfs_string(const char *filename, const char *basedir, 80 const char *val); 81 int read_sysfs_posint(const char *filename, const char *basedir); 82 int read_sysfs_float(const char *filename, const char *basedir, float *val); 83 int read_sysfs_string(const char *filename, const char *basedir, char *str); 84 85 #endif /* _IIO_UTILS_H_ */ 86