linux utils/log.h,代码阅读 - Linux\kernel\linux-5.0\tools\iio\iio_utils.h

#ifndef _IIO_UTILS_H_

#define _IIO_UTILS_H_

/* IIO - useful set of util functionality

*

* Copyright (c) 2008 Jonathan Cameron

*

* This program is free software; you can redistribute it and/or modify it

* under the terms of the GNU General Public License version 2 as published by

* the Free Software Foundation.

*/

#include

/* Made up value to limit allocation sizes */

#define IIO_MAX_NAME_LENGTH 64

#define FORMAT_SCAN_ELEMENTS_DIR "%s/scan_elements"

#define FORMAT_TYPE_FILE "%s_type"

#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))

extern const char *iio_dir;

/**

* struct iio_channel_info - information about a given channel

* @name: channel name

* @generic_name: general name for channel type

* @scale: scale factor to be applied for conversion to si units

* @offset: offset to be applied for conversion to si units

* @index: the channel index in the buffer output

* @bytes: number of bytes occupied in buffer output

* @bits_used: number of valid bits of data

* @shift: amount of bits to shift right data before applying bit mask

* @mask: a bit mask for the raw output

* @be: flag if data is big endian

* @is_signed: is the raw value stored signed

* @location: data offset for this channel inside the buffer (in bytes)

**/

struct iio_channel_info {

char *name;

char *generic_name;

float scale;

float offset;

unsigned index;

unsigned bytes;

unsigned bits_used;

unsigned shift;

uint64_t mask;

unsigned be;

unsigned is_signed;

unsigned location;

};

static inline int iioutils_check_suffix(const char *str, const char *suffix)

{

return strlen(str) >= strlen(suffix) &&

strncmp(str+strlen(str)-strlen(suffix),

suffix, strlen(suffix)) == 0;

}

int iioutils_break_up_name(const char *full_name, char **generic_name);

int iioutils_get_type(unsigned *is_signed, unsigned *bytes, unsigned *bits_used,

unsigned *shift, uint64_t *mask, unsigned *be,

const char *device_dir, const char *name,

const char *generic_name);

int iioutils_get_param_float(float *output, const char *param_name,

const char *device_dir, const char *name,

const char *generic_name);

void bsort_channel_array_by_index(struct iio_channel_info *ci_array, int cnt);

int build_channel_array(const char *device_dir,

struct iio_channel_info **ci_array, int *counter);

int find_type_by_name(const char *name, const char *type);

int write_sysfs_int(const char *filename, const char *basedir, int val);

int write_sysfs_int_and_verify(const char *filename, const char *basedir,

int val);

int write_sysfs_string_and_verify(const char *filename, const char *basedir,

const char *val);

int write_sysfs_string(const char *filename, const char *basedir,

const char *val);

int read_sysfs_posint(const char *filename, const char *basedir);

int read_sysfs_float(const char *filename, const char *basedir, float *val);

int read_sysfs_string(const char *filename, const char *basedir, char *str);

#endif /* _IIO_UTILS_H_ */