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/buffer%d" 16 #define FORMAT_EVENTS_DIR "%s/events" 17 #define FORMAT_TYPE_FILE "%s_type" 18 19 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0])) 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 static inline int iioutils_check_suffix(const char *str, const char *suffix) 54 { 55 return strlen(str) >= strlen(suffix) && 56 strncmp(str+strlen(str)-strlen(suffix), 57 suffix, strlen(suffix)) == 0; 58 } 59 60 int iioutils_break_up_name(const char *full_name, char **generic_name); 61 int iioutils_get_param_float(float *output, const char *param_name, 62 const char *device_dir, const char *name, 63 const char *generic_name); 64 void bsort_channel_array_by_index(struct iio_channel_info *ci_array, int cnt); 65 int build_channel_array(const char *device_dir, int buffer_idx, 66 struct iio_channel_info **ci_array, int *counter); 67 int find_type_by_name(const char *name, const char *type); 68 int write_sysfs_int(const char *filename, const char *basedir, int val); 69 int write_sysfs_int_and_verify(const char *filename, const char *basedir, 70 int val); 71 int write_sysfs_string_and_verify(const char *filename, const char *basedir, 72 const char *val); 73 int write_sysfs_string(const char *filename, const char *basedir, 74 const char *val); 75 int read_sysfs_posint(const char *filename, const char *basedir); 76 int read_sysfs_float(const char *filename, const char *basedir, float *val); 77 int read_sysfs_string(const char *filename, const char *basedir, char *str); 78 79 #endif /* _IIO_UTILS_H_ */ 80