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/*
* Firmware loader
* Base on hotplug2 code (GPL v2) (http://code.google.com/p/hotplug2/)
* Copyright stepan@davidovic.cz, iSteve <isteve@bofh.cz> Tomas Janousek <tomi@nomi.cz>
*/
#include <sys/types.h>
#include <sys/param.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
/**
* Function supplementing 'echo > file'
*
* @1 File to be written to
* @2 Data to be written
* @3 Data size
*
* Returns: 0 on success, -1 on failure.
*/
static int echo_to_file(const char *filename, const char *data, size_t size) {
FILE *fp;
size_t written;
fp = fopen(filename, "w");
if (fp == NULL)
return -1;
written = fwrite(data, size, 1, fp);
fclose(fp);
return (written == size) ? 0 : -1;
}
int main(int argc, char **argv) {
char buffer[1024];
char *devpath;
char *firmware;
char firmware_path[PATH_MAX];
char sysfs_path_loading[PATH_MAX];
char sysfs_path_data[PATH_MAX];
int rv;
FILE *infp, *outfp;
size_t inlen, outlen;
devpath = getenv("DEVPATH");
if (devpath == NULL)
return -1;
firmware = getenv("FIRMWARE");
if (firmware == NULL)
return -1;
if (snprintf(sysfs_path_loading, PATH_MAX, "/sysfs%s/loading", devpath) >= PATH_MAX)
return -1;
if (snprintf(sysfs_path_data, PATH_MAX, "/sysfs%s/data", devpath) >= PATH_MAX)
return -1;
if (snprintf(firmware_path, PATH_MAX, "%s/%s", argv[0], firmware) >= PATH_MAX)
return -1;
echo_to_file(sysfs_path_loading, "1\n", 2);
infp = fopen(firmware_path, "r");
if (infp == NULL) {
echo_to_file(sysfs_path_loading, "0\n", 2);
return -1;
}
outfp = fopen(sysfs_path_data, "w");
if (outfp == NULL) {
fclose(infp);
echo_to_file(sysfs_path_loading, "0\n", 2);
return -1;
}
rv = 0;
while ((inlen = fread(buffer, 1, 1024, infp)) > 0) {
outlen = fwrite(buffer, 1, inlen, outfp);
if (outlen != inlen) {
rv = -1;
break;
}
}
fclose(infp);
echo_to_file(sysfs_path_loading, "0\n", 2);
return rv;
}
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