995 lines
21 KiB
C
995 lines
21 KiB
C
/* IIO - useful set of util functionality
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*
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* Copyright (c) 2008 Jonathan Cameron
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <dirent.h>
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#include <errno.h>
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#include <ctype.h>
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#include "iio_utils.h"
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const char *iio_dir = "/sys/bus/iio/devices/";
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static char * const iio_direction[] = {
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"in",
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"out",
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};
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/**
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* iioutils_break_up_name() - extract generic name from full channel name
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* @full_name: the full channel name
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* @generic_name: the output generic channel name
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*
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* Returns 0 on success, or a negative error code if string extraction failed.
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**/
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int iioutils_break_up_name(const char *full_name, char **generic_name)
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{
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char *current;
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char *w, *r;
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char *working, *prefix = "";
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int i, ret;
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for (i = 0; i < ARRAY_SIZE(iio_direction); i++)
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if (!strncmp(full_name, iio_direction[i],
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strlen(iio_direction[i]))) {
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prefix = iio_direction[i];
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break;
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}
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current = strdup(full_name + strlen(prefix) + 1);
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if (!current)
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return -ENOMEM;
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working = strtok(current, "_\0");
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if (!working) {
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free(current);
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return -EINVAL;
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}
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w = working;
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r = working;
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while (*r != '\0') {
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if (!isdigit(*r)) {
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*w = *r;
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w++;
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}
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r++;
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}
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*w = '\0';
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ret = asprintf(generic_name, "%s_%s", prefix, working);
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free(current);
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return (ret == -1) ? -ENOMEM : 0;
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}
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/**
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* iioutils_get_type() - find and process _type attribute data
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* @is_signed: output whether channel is signed
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* @bytes: output how many bytes the channel storage occupies
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* @bits_used: output number of valid bits of data
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* @shift: output amount of bits to shift right data before applying bit mask
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* @mask: output a bit mask for the raw data
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* @be: output if data in big endian
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* @device_dir: the IIO device directory
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* @name: the channel name
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* @generic_name: the channel type name
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*
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* Returns a value >= 0 on success, otherwise a negative error code.
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**/
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int iioutils_get_type(unsigned *is_signed, unsigned *bytes, unsigned *bits_used,
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unsigned *shift, uint64_t *mask, unsigned *be,
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const char *device_dir, const char *name,
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const char *generic_name)
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{
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FILE *sysfsfp;
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int ret;
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DIR *dp;
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char *scan_el_dir, *builtname, *builtname_generic, *filename = 0;
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char signchar, endianchar;
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unsigned padint;
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const struct dirent *ent;
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ret = asprintf(&scan_el_dir, FORMAT_SCAN_ELEMENTS_DIR, device_dir);
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if (ret < 0)
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return -ENOMEM;
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ret = asprintf(&builtname, FORMAT_TYPE_FILE, name);
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if (ret < 0) {
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ret = -ENOMEM;
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goto error_free_scan_el_dir;
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}
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ret = asprintf(&builtname_generic, FORMAT_TYPE_FILE, generic_name);
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if (ret < 0) {
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ret = -ENOMEM;
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goto error_free_builtname;
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}
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dp = opendir(scan_el_dir);
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if (!dp) {
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ret = -errno;
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goto error_free_builtname_generic;
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}
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ret = -ENOENT;
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while (ent = readdir(dp), ent)
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if ((strcmp(builtname, ent->d_name) == 0) ||
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(strcmp(builtname_generic, ent->d_name) == 0)) {
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ret = asprintf(&filename,
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"%s/%s", scan_el_dir, ent->d_name);
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if (ret < 0) {
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ret = -ENOMEM;
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goto error_closedir;
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}
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sysfsfp = fopen(filename, "r");
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if (!sysfsfp) {
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ret = -errno;
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fprintf(stderr, "failed to open %s\n",
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filename);
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goto error_free_filename;
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}
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ret = fscanf(sysfsfp,
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"%ce:%c%u/%u>>%u",
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&endianchar,
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&signchar,
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bits_used,
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&padint, shift);
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if (ret < 0) {
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ret = -errno;
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fprintf(stderr,
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"failed to pass scan type description\n");
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goto error_close_sysfsfp;
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} else if (ret != 5) {
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ret = -EIO;
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fprintf(stderr,
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"scan type description didn't match\n");
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goto error_close_sysfsfp;
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}
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*be = (endianchar == 'b');
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*bytes = padint / 8;
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if (*bits_used == 64)
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*mask = ~0;
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else
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*mask = (1ULL << *bits_used) - 1;
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*is_signed = (signchar == 's');
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if (fclose(sysfsfp)) {
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ret = -errno;
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fprintf(stderr, "Failed to close %s\n",
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filename);
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goto error_free_filename;
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}
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sysfsfp = 0;
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free(filename);
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filename = 0;
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/*
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* Avoid having a more generic entry overwriting
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* the settings.
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*/
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if (strcmp(builtname, ent->d_name) == 0)
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break;
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}
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error_close_sysfsfp:
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if (sysfsfp)
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if (fclose(sysfsfp))
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perror("iioutils_get_type(): Failed to close file");
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error_free_filename:
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if (filename)
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free(filename);
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error_closedir:
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if (closedir(dp) == -1)
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perror("iioutils_get_type(): Failed to close directory");
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error_free_builtname_generic:
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free(builtname_generic);
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error_free_builtname:
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free(builtname);
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error_free_scan_el_dir:
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free(scan_el_dir);
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return ret;
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}
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/**
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* iioutils_get_param_float() - read a float value from a channel parameter
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* @output: output the float value
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* @param_name: the parameter name to read
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* @device_dir: the IIO device directory in sysfs
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* @name: the channel name
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* @generic_name: the channel type name
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*
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* Returns a value >= 0 on success, otherwise a negative error code.
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**/
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int iioutils_get_param_float(float *output, const char *param_name,
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const char *device_dir, const char *name,
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const char *generic_name)
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{
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FILE *sysfsfp;
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int ret;
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DIR *dp;
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char *builtname, *builtname_generic;
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char *filename = NULL;
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const struct dirent *ent;
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ret = asprintf(&builtname, "%s_%s", name, param_name);
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if (ret < 0)
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return -ENOMEM;
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ret = asprintf(&builtname_generic,
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"%s_%s", generic_name, param_name);
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if (ret < 0) {
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ret = -ENOMEM;
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goto error_free_builtname;
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}
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dp = opendir(device_dir);
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if (!dp) {
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ret = -errno;
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goto error_free_builtname_generic;
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}
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ret = -ENOENT;
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while (ent = readdir(dp), ent)
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if ((strcmp(builtname, ent->d_name) == 0) ||
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(strcmp(builtname_generic, ent->d_name) == 0)) {
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ret = asprintf(&filename,
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"%s/%s", device_dir, ent->d_name);
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if (ret < 0) {
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ret = -ENOMEM;
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goto error_closedir;
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}
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sysfsfp = fopen(filename, "r");
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if (!sysfsfp) {
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ret = -errno;
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goto error_free_filename;
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}
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errno = 0;
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if (fscanf(sysfsfp, "%f", output) != 1)
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ret = errno ? -errno : -ENODATA;
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break;
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}
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error_free_filename:
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if (filename)
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free(filename);
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error_closedir:
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if (closedir(dp) == -1)
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perror("iioutils_get_param_float(): Failed to close directory");
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error_free_builtname_generic:
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free(builtname_generic);
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error_free_builtname:
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free(builtname);
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return ret;
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}
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/**
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* bsort_channel_array_by_index() - sort the array in index order
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* @ci_array: the iio_channel_info array to be sorted
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* @cnt: the amount of array elements
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**/
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void bsort_channel_array_by_index(struct iio_channel_info *ci_array, int cnt)
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{
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struct iio_channel_info temp;
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int x, y;
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for (x = 0; x < cnt; x++)
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for (y = 0; y < (cnt - 1); y++)
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if (ci_array[y].index > ci_array[y + 1].index) {
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temp = ci_array[y + 1];
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ci_array[y + 1] = ci_array[y];
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ci_array[y] = temp;
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}
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}
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/**
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* build_channel_array() - function to figure out what channels are present
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* @device_dir: the IIO device directory in sysfs
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* @ci_array: output the resulting array of iio_channel_info
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* @counter: output the amount of array elements
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*
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* Returns 0 on success, otherwise a negative error code.
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**/
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int build_channel_array(const char *device_dir,
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struct iio_channel_info **ci_array, int *counter)
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{
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DIR *dp;
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FILE *sysfsfp;
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int count = 0, i;
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struct iio_channel_info *current;
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int ret;
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const struct dirent *ent;
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char *scan_el_dir;
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char *filename;
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*counter = 0;
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ret = asprintf(&scan_el_dir, FORMAT_SCAN_ELEMENTS_DIR, device_dir);
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if (ret < 0)
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return -ENOMEM;
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dp = opendir(scan_el_dir);
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if (!dp) {
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ret = -errno;
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goto error_free_name;
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}
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while (ent = readdir(dp), ent)
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if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"),
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"_en") == 0) {
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ret = asprintf(&filename,
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"%s/%s", scan_el_dir, ent->d_name);
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if (ret < 0) {
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ret = -ENOMEM;
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goto error_close_dir;
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}
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sysfsfp = fopen(filename, "r");
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if (!sysfsfp) {
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ret = -errno;
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free(filename);
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goto error_close_dir;
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}
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errno = 0;
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if (fscanf(sysfsfp, "%i", &ret) != 1) {
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ret = errno ? -errno : -ENODATA;
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if (fclose(sysfsfp))
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perror("build_channel_array(): Failed to close file");
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free(filename);
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goto error_close_dir;
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}
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if (ret == 1)
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(*counter)++;
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if (fclose(sysfsfp)) {
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ret = -errno;
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free(filename);
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goto error_close_dir;
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}
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free(filename);
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}
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*ci_array = malloc(sizeof(**ci_array) * (*counter));
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if (!*ci_array) {
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ret = -ENOMEM;
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goto error_close_dir;
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}
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seekdir(dp, 0);
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while (ent = readdir(dp), ent) {
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if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"),
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"_en") == 0) {
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int current_enabled = 0;
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current = &(*ci_array)[count++];
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ret = asprintf(&filename,
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"%s/%s", scan_el_dir, ent->d_name);
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if (ret < 0) {
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ret = -ENOMEM;
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/* decrement count to avoid freeing name */
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count--;
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goto error_cleanup_array;
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}
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sysfsfp = fopen(filename, "r");
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if (!sysfsfp) {
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ret = -errno;
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free(filename);
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count--;
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goto error_cleanup_array;
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}
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errno = 0;
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if (fscanf(sysfsfp, "%i", ¤t_enabled) != 1) {
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ret = errno ? -errno : -ENODATA;
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free(filename);
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count--;
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goto error_cleanup_array;
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}
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if (fclose(sysfsfp)) {
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ret = -errno;
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free(filename);
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count--;
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goto error_cleanup_array;
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}
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if (!current_enabled) {
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free(filename);
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count--;
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continue;
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}
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current->scale = 1.0;
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current->offset = 0;
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current->name = strndup(ent->d_name,
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strlen(ent->d_name) -
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strlen("_en"));
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if (!current->name) {
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free(filename);
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ret = -ENOMEM;
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count--;
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goto error_cleanup_array;
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}
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/* Get the generic and specific name elements */
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ret = iioutils_break_up_name(current->name,
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¤t->generic_name);
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if (ret) {
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free(filename);
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free(current->name);
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count--;
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goto error_cleanup_array;
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}
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ret = asprintf(&filename,
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"%s/%s_index",
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scan_el_dir,
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current->name);
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if (ret < 0) {
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free(filename);
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ret = -ENOMEM;
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goto error_cleanup_array;
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}
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sysfsfp = fopen(filename, "r");
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if (!sysfsfp) {
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ret = -errno;
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fprintf(stderr, "failed to open %s\n",
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filename);
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free(filename);
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goto error_cleanup_array;
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}
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errno = 0;
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if (fscanf(sysfsfp, "%u", ¤t->index) != 1) {
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ret = errno ? -errno : -ENODATA;
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if (fclose(sysfsfp))
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perror("build_channel_array(): Failed to close file");
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free(filename);
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goto error_cleanup_array;
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}
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if (fclose(sysfsfp)) {
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ret = -errno;
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free(filename);
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goto error_cleanup_array;
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}
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free(filename);
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/* Find the scale */
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ret = iioutils_get_param_float(¤t->scale,
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"scale",
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device_dir,
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current->name,
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current->generic_name);
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if ((ret < 0) && (ret != -ENOENT))
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goto error_cleanup_array;
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ret = iioutils_get_param_float(¤t->offset,
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"offset",
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device_dir,
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current->name,
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current->generic_name);
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if ((ret < 0) && (ret != -ENOENT))
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goto error_cleanup_array;
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ret = iioutils_get_type(¤t->is_signed,
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¤t->bytes,
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¤t->bits_used,
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¤t->shift,
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¤t->mask,
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¤t->be,
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device_dir,
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current->name,
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current->generic_name);
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if (ret < 0)
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goto error_cleanup_array;
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}
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}
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if (closedir(dp) == -1) {
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ret = -errno;
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goto error_cleanup_array;
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}
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free(scan_el_dir);
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/* reorder so that the array is in index order */
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bsort_channel_array_by_index(*ci_array, *counter);
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return 0;
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error_cleanup_array:
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for (i = count - 1; i >= 0; i--) {
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free((*ci_array)[i].name);
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free((*ci_array)[i].generic_name);
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}
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free(*ci_array);
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*ci_array = NULL;
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*counter = 0;
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error_close_dir:
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if (dp)
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if (closedir(dp) == -1)
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perror("build_channel_array(): Failed to close dir");
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error_free_name:
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free(scan_el_dir);
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return ret;
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}
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static int calc_digits(int num)
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{
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int count = 0;
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while (num != 0) {
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num /= 10;
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count++;
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}
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return count;
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}
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/**
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* find_type_by_name() - function to match top level types by name
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* @name: top level type instance name
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* @type: the type of top level instance being searched
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*
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* Returns the device number of a matched IIO device on success, otherwise a
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* negative error code.
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* Typical types this is used for are device and trigger.
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**/
|
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int find_type_by_name(const char *name, const char *type)
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{
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const struct dirent *ent;
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int number, numstrlen, ret;
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|
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FILE *namefp;
|
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DIR *dp;
|
|
char thisname[IIO_MAX_NAME_LENGTH];
|
|
char *filename;
|
|
|
|
dp = opendir(iio_dir);
|
|
if (!dp) {
|
|
fprintf(stderr, "No industrialio devices available\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
while (ent = readdir(dp), ent) {
|
|
if (strcmp(ent->d_name, ".") != 0 &&
|
|
strcmp(ent->d_name, "..") != 0 &&
|
|
strlen(ent->d_name) > strlen(type) &&
|
|
strncmp(ent->d_name, type, strlen(type)) == 0) {
|
|
errno = 0;
|
|
ret = sscanf(ent->d_name + strlen(type), "%d", &number);
|
|
if (ret < 0) {
|
|
ret = -errno;
|
|
fprintf(stderr,
|
|
"failed to read element number\n");
|
|
goto error_close_dir;
|
|
} else if (ret != 1) {
|
|
ret = -EIO;
|
|
fprintf(stderr,
|
|
"failed to match element number\n");
|
|
goto error_close_dir;
|
|
}
|
|
|
|
numstrlen = calc_digits(number);
|
|
/* verify the next character is not a colon */
|
|
if (strncmp(ent->d_name + strlen(type) + numstrlen,
|
|
":", 1) != 0) {
|
|
filename = malloc(strlen(iio_dir) + strlen(type)
|
|
+ numstrlen + 6);
|
|
if (!filename) {
|
|
ret = -ENOMEM;
|
|
goto error_close_dir;
|
|
}
|
|
|
|
ret = sprintf(filename, "%s%s%d/name", iio_dir,
|
|
type, number);
|
|
if (ret < 0) {
|
|
free(filename);
|
|
goto error_close_dir;
|
|
}
|
|
|
|
namefp = fopen(filename, "r");
|
|
if (!namefp) {
|
|
free(filename);
|
|
continue;
|
|
}
|
|
|
|
free(filename);
|
|
errno = 0;
|
|
if (fscanf(namefp, "%s", thisname) != 1) {
|
|
ret = errno ? -errno : -ENODATA;
|
|
goto error_close_dir;
|
|
}
|
|
|
|
if (fclose(namefp)) {
|
|
ret = -errno;
|
|
goto error_close_dir;
|
|
}
|
|
|
|
if (strcmp(name, thisname) == 0) {
|
|
if (closedir(dp) == -1)
|
|
return -errno;
|
|
|
|
return number;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (closedir(dp) == -1)
|
|
return -errno;
|
|
|
|
return -ENODEV;
|
|
|
|
error_close_dir:
|
|
if (closedir(dp) == -1)
|
|
perror("find_type_by_name(): Failed to close directory");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int _write_sysfs_int(const char *filename, const char *basedir, int val,
|
|
int verify)
|
|
{
|
|
int ret = 0;
|
|
FILE *sysfsfp;
|
|
int test;
|
|
char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
|
|
|
|
if (!temp)
|
|
return -ENOMEM;
|
|
|
|
ret = sprintf(temp, "%s/%s", basedir, filename);
|
|
if (ret < 0)
|
|
goto error_free;
|
|
|
|
sysfsfp = fopen(temp, "w");
|
|
if (!sysfsfp) {
|
|
ret = -errno;
|
|
fprintf(stderr, "failed to open %s\n", temp);
|
|
goto error_free;
|
|
}
|
|
|
|
ret = fprintf(sysfsfp, "%d", val);
|
|
if (ret < 0) {
|
|
if (fclose(sysfsfp))
|
|
perror("_write_sysfs_int(): Failed to close dir");
|
|
|
|
goto error_free;
|
|
}
|
|
|
|
if (fclose(sysfsfp)) {
|
|
ret = -errno;
|
|
goto error_free;
|
|
}
|
|
|
|
if (verify) {
|
|
sysfsfp = fopen(temp, "r");
|
|
if (!sysfsfp) {
|
|
ret = -errno;
|
|
fprintf(stderr, "failed to open %s\n", temp);
|
|
goto error_free;
|
|
}
|
|
|
|
if (fscanf(sysfsfp, "%d", &test) != 1) {
|
|
ret = errno ? -errno : -ENODATA;
|
|
if (fclose(sysfsfp))
|
|
perror("_write_sysfs_int(): Failed to close dir");
|
|
|
|
goto error_free;
|
|
}
|
|
|
|
if (fclose(sysfsfp)) {
|
|
ret = -errno;
|
|
goto error_free;
|
|
}
|
|
|
|
if (test != val) {
|
|
fprintf(stderr,
|
|
"Possible failure in int write %d to %s/%s\n",
|
|
val, basedir, filename);
|
|
ret = -1;
|
|
}
|
|
}
|
|
|
|
error_free:
|
|
free(temp);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* write_sysfs_int() - write an integer value to a sysfs file
|
|
* @filename: name of the file to write to
|
|
* @basedir: the sysfs directory in which the file is to be found
|
|
* @val: integer value to write to file
|
|
*
|
|
* Returns a value >= 0 on success, otherwise a negative error code.
|
|
**/
|
|
int write_sysfs_int(const char *filename, const char *basedir, int val)
|
|
{
|
|
return _write_sysfs_int(filename, basedir, val, 0);
|
|
}
|
|
|
|
/**
|
|
* write_sysfs_int_and_verify() - write an integer value to a sysfs file
|
|
* and verify
|
|
* @filename: name of the file to write to
|
|
* @basedir: the sysfs directory in which the file is to be found
|
|
* @val: integer value to write to file
|
|
*
|
|
* Returns a value >= 0 on success, otherwise a negative error code.
|
|
**/
|
|
int write_sysfs_int_and_verify(const char *filename, const char *basedir,
|
|
int val)
|
|
{
|
|
return _write_sysfs_int(filename, basedir, val, 1);
|
|
}
|
|
|
|
static int _write_sysfs_string(const char *filename, const char *basedir,
|
|
const char *val, int verify)
|
|
{
|
|
int ret = 0;
|
|
FILE *sysfsfp;
|
|
char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
|
|
|
|
if (!temp) {
|
|
fprintf(stderr, "Memory allocation failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ret = sprintf(temp, "%s/%s", basedir, filename);
|
|
if (ret < 0)
|
|
goto error_free;
|
|
|
|
sysfsfp = fopen(temp, "w");
|
|
if (!sysfsfp) {
|
|
ret = -errno;
|
|
fprintf(stderr, "Could not open %s\n", temp);
|
|
goto error_free;
|
|
}
|
|
|
|
ret = fprintf(sysfsfp, "%s", val);
|
|
if (ret < 0) {
|
|
if (fclose(sysfsfp))
|
|
perror("_write_sysfs_string(): Failed to close dir");
|
|
|
|
goto error_free;
|
|
}
|
|
|
|
if (fclose(sysfsfp)) {
|
|
ret = -errno;
|
|
goto error_free;
|
|
}
|
|
|
|
if (verify) {
|
|
sysfsfp = fopen(temp, "r");
|
|
if (!sysfsfp) {
|
|
ret = -errno;
|
|
fprintf(stderr, "Could not open file to verify\n");
|
|
goto error_free;
|
|
}
|
|
|
|
if (fscanf(sysfsfp, "%s", temp) != 1) {
|
|
ret = errno ? -errno : -ENODATA;
|
|
if (fclose(sysfsfp))
|
|
perror("_write_sysfs_string(): Failed to close dir");
|
|
|
|
goto error_free;
|
|
}
|
|
|
|
if (fclose(sysfsfp)) {
|
|
ret = -errno;
|
|
goto error_free;
|
|
}
|
|
|
|
if (strcmp(temp, val) != 0) {
|
|
fprintf(stderr,
|
|
"Possible failure in string write of %s "
|
|
"Should be %s written to %s/%s\n", temp, val,
|
|
basedir, filename);
|
|
ret = -1;
|
|
}
|
|
}
|
|
|
|
error_free:
|
|
free(temp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* write_sysfs_string_and_verify() - string write, readback and verify
|
|
* @filename: name of file to write to
|
|
* @basedir: the sysfs directory in which the file is to be found
|
|
* @val: the string to write
|
|
*
|
|
* Returns a value >= 0 on success, otherwise a negative error code.
|
|
**/
|
|
int write_sysfs_string_and_verify(const char *filename, const char *basedir,
|
|
const char *val)
|
|
{
|
|
return _write_sysfs_string(filename, basedir, val, 1);
|
|
}
|
|
|
|
/**
|
|
* write_sysfs_string() - write string to a sysfs file
|
|
* @filename: name of file to write to
|
|
* @basedir: the sysfs directory in which the file is to be found
|
|
* @val: the string to write
|
|
*
|
|
* Returns a value >= 0 on success, otherwise a negative error code.
|
|
**/
|
|
int write_sysfs_string(const char *filename, const char *basedir,
|
|
const char *val)
|
|
{
|
|
return _write_sysfs_string(filename, basedir, val, 0);
|
|
}
|
|
|
|
/**
|
|
* read_sysfs_posint() - read an integer value from file
|
|
* @filename: name of file to read from
|
|
* @basedir: the sysfs directory in which the file is to be found
|
|
*
|
|
* Returns the read integer value >= 0 on success, otherwise a negative error
|
|
* code.
|
|
**/
|
|
int read_sysfs_posint(const char *filename, const char *basedir)
|
|
{
|
|
int ret;
|
|
FILE *sysfsfp;
|
|
char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
|
|
|
|
if (!temp) {
|
|
fprintf(stderr, "Memory allocation failed");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ret = sprintf(temp, "%s/%s", basedir, filename);
|
|
if (ret < 0)
|
|
goto error_free;
|
|
|
|
sysfsfp = fopen(temp, "r");
|
|
if (!sysfsfp) {
|
|
ret = -errno;
|
|
goto error_free;
|
|
}
|
|
|
|
errno = 0;
|
|
if (fscanf(sysfsfp, "%d\n", &ret) != 1) {
|
|
ret = errno ? -errno : -ENODATA;
|
|
if (fclose(sysfsfp))
|
|
perror("read_sysfs_posint(): Failed to close dir");
|
|
|
|
goto error_free;
|
|
}
|
|
|
|
if (fclose(sysfsfp))
|
|
ret = -errno;
|
|
|
|
error_free:
|
|
free(temp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* read_sysfs_float() - read a float value from file
|
|
* @filename: name of file to read from
|
|
* @basedir: the sysfs directory in which the file is to be found
|
|
* @val: output the read float value
|
|
*
|
|
* Returns a value >= 0 on success, otherwise a negative error code.
|
|
**/
|
|
int read_sysfs_float(const char *filename, const char *basedir, float *val)
|
|
{
|
|
int ret = 0;
|
|
FILE *sysfsfp;
|
|
char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
|
|
|
|
if (!temp) {
|
|
fprintf(stderr, "Memory allocation failed");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ret = sprintf(temp, "%s/%s", basedir, filename);
|
|
if (ret < 0)
|
|
goto error_free;
|
|
|
|
sysfsfp = fopen(temp, "r");
|
|
if (!sysfsfp) {
|
|
ret = -errno;
|
|
goto error_free;
|
|
}
|
|
|
|
errno = 0;
|
|
if (fscanf(sysfsfp, "%f\n", val) != 1) {
|
|
ret = errno ? -errno : -ENODATA;
|
|
if (fclose(sysfsfp))
|
|
perror("read_sysfs_float(): Failed to close dir");
|
|
|
|
goto error_free;
|
|
}
|
|
|
|
if (fclose(sysfsfp))
|
|
ret = -errno;
|
|
|
|
error_free:
|
|
free(temp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* read_sysfs_string() - read a string from file
|
|
* @filename: name of file to read from
|
|
* @basedir: the sysfs directory in which the file is to be found
|
|
* @str: output the read string
|
|
*
|
|
* Returns a value >= 0 on success, otherwise a negative error code.
|
|
**/
|
|
int read_sysfs_string(const char *filename, const char *basedir, char *str)
|
|
{
|
|
int ret = 0;
|
|
FILE *sysfsfp;
|
|
char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
|
|
|
|
if (!temp) {
|
|
fprintf(stderr, "Memory allocation failed");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ret = sprintf(temp, "%s/%s", basedir, filename);
|
|
if (ret < 0)
|
|
goto error_free;
|
|
|
|
sysfsfp = fopen(temp, "r");
|
|
if (!sysfsfp) {
|
|
ret = -errno;
|
|
goto error_free;
|
|
}
|
|
|
|
errno = 0;
|
|
if (fscanf(sysfsfp, "%s\n", str) != 1) {
|
|
ret = errno ? -errno : -ENODATA;
|
|
if (fclose(sysfsfp))
|
|
perror("read_sysfs_string(): Failed to close dir");
|
|
|
|
goto error_free;
|
|
}
|
|
|
|
if (fclose(sysfsfp))
|
|
ret = -errno;
|
|
|
|
error_free:
|
|
free(temp);
|
|
|
|
return ret;
|
|
}
|