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/* 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.
*/
/* Made up value to limit allocation sizes */
#include <string.h>
#include <stdlib.h>
#define IIO_MAX_NAME_LENGTH 30
#define IIO_EVENT_CODE_RING_50_FULL 200
#define IIO_EVENT_CODE_RING_75_FULL 201
#define IIO_EVENT_CODE_RING_100_FULL 202
const char *iio_dir = "/sys/bus/iio/devices/";
struct iio_event_data {
int id;
__s64 timestamp;
};
/**
* find_type_by_name() - function to match top level types by name
* @name: top level type instance name
* @type: the type of top level instance being sort
*
* Typical types this is used for are device and trigger.
**/
inline int find_type_by_name(const char *name, const char *type)
{
const struct dirent *ent;
int number, numstrlen;
FILE *nameFile;
DIR *dp;
char thisname[IIO_MAX_NAME_LENGTH];
char *filename;
struct stat Stat;
dp = opendir(iio_dir);
if (dp == NULL) {
printf("No industrialio devices available");
return -ENODEV;
}
while (ent = readdir(dp), ent != NULL) {
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) {
numstrlen = sscanf(ent->d_name + strlen(type),
"%d",
&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 == NULL)
return -ENOMEM;
sprintf(filename, "%s%s%d/name",
iio_dir,
type,
number);
nameFile = fopen(filename, "r");
if (!nameFile)
continue;
free(filename);
fscanf(nameFile, "%s", thisname);
if (strcmp(name, thisname) == 0)
return number;
fclose(nameFile);
}
}
}
return -ENODEV;
}
inline int _write_sysfs_int(char *filename, char *basedir, int val, int verify)
{
int ret;
FILE *sysfsfp;
int test;
char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
if (temp == NULL)
return -ENOMEM;
sprintf(temp, "%s/%s", basedir, filename);
sysfsfp = fopen(temp, "w");
if (sysfsfp == NULL) {
printf("failed to open %s\n", temp);
ret = -errno;
goto error_free;
}
fprintf(sysfsfp, "%d", val);
fclose(sysfsfp);
if (verify) {
sysfsfp = fopen(temp, "r");
if (sysfsfp == NULL) {
printf("failed to open %s\n", temp);
ret = -errno;
goto error_free;
}
fscanf(sysfsfp, "%d", &test);
if (test != val) {
printf("Possible failure in int write %d to %s%s\n",
val,
basedir,
filename);
ret = -1;
}
}
error_free:
free(temp);
return ret;
}
int write_sysfs_int(char *filename, char *basedir, int val)
{
return _write_sysfs_int(filename, basedir, val, 0);
}
int write_sysfs_int_and_verify(char *filename, char *basedir, int val)
{
return _write_sysfs_int(filename, basedir, val, 1);
}
int _write_sysfs_string(char *filename, char *basedir, char *val, int verify)
{
int ret;
FILE *sysfsfp;
char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
if (temp == NULL) {
printf("Memory allocation failed\n");
return -ENOMEM;
}
sprintf(temp, "%s/%s", basedir, filename);
sysfsfp = fopen(temp, "w");
if (sysfsfp == NULL) {
printf("Could not open %s\n", temp);
ret = -errno;
goto error_free;
}
fprintf(sysfsfp, "%s", val);
fclose(sysfsfp);
if (verify) {
sysfsfp = fopen(temp, "r");
if (sysfsfp == NULL) {
ret = -errno;
goto error_free;
}
fscanf(sysfsfp, "%s", temp);
if (strcmp(temp, val) != 0) {
printf("Possible failure in string write of %s "
"Should be %s "
"writen 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
**/
int write_sysfs_string_and_verify(char *filename, char *basedir, char *val)
{
return _write_sysfs_string(filename, basedir, val, 1);
}
int write_sysfs_string(char *filename, char *basedir, char *val)
{
return _write_sysfs_string(filename, basedir, val, 0);
}
int read_sysfs_posint(char *filename, char *basedir)
{
int ret;
FILE *sysfsfp;
char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
if (temp == NULL) {
printf("Memory allocation failed");
return -ENOMEM;
}
sprintf(temp, "%s/%s", basedir, filename);
sysfsfp = fopen(temp, "r");
if (sysfsfp == NULL) {
ret = -errno;
goto error_free;
}
fscanf(sysfsfp, "%d\n", &ret);
fclose(sysfsfp);
error_free:
free(temp);
return ret;
}
int read_sysfs_float(char *filename, char *basedir, float *val)
{
float ret = 0;
FILE *sysfsfp;
char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
if (temp == NULL) {
printf("Memory allocation failed");
return -ENOMEM;
}
sprintf(temp, "%s/%s", basedir, filename);
sysfsfp = fopen(temp, "r");
if (sysfsfp == NULL) {
ret = -errno;
goto error_free;
}
fscanf(sysfsfp, "%f\n", val);
fclose(sysfsfp);
error_free:
free(temp);
return ret;
}
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