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/*
* A simple firmware helper program.
*
* Copyright 2005 Red Hat, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 of the License.
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <sys/stat.h>
#include "../../udev_utils.h"
#include "../../logging.h"
#define FIRMWARE_PATH "/lib/firmware"
#define PATH_SIZE 256
#ifdef USE_LOG
void log_message(int priority, const char *format, ...)
{
va_list args;
static int udev_log = -1;
if (udev_log == -1) {
const char *value;
value = getenv("UDEV_LOG");
if (value)
udev_log = log_priority(value);
else
udev_log = LOG_ERR;
}
if (priority > udev_log)
return;
va_start(args, format);
vsyslog(priority, format, args);
va_end(args);
}
#endif
/* Set the 'loading' attribute for a firmware device.
* 1 == currently loading
* 0 == done loading
* -1 == error
*/
static int set_loading(const char *device, int value) {
char loading_path[PATH_SIZE];
int rc;
FILE *f;
snprintf(loading_path, sizeof(loading_path), "/sys/%s/loading", device);
loading_path[sizeof(loading_path)-1] = '\0';
f = fopen(loading_path, "w");
if (!f)
return -1;
rc = fprintf(f, "%d", value);
fclose(f);
if (rc < 0)
return rc;
return 0;
}
int main(int argc, char **argv) {
char *devpath, *firmware, *action, *driver;
char fw_path[PATH_SIZE];
char data_path[PATH_SIZE];
int fw_fd;
char *fw_buffer;
size_t fw_buffer_size;
size_t count;
int rc = 0;
logging_init("firmware_helper");
driver = getenv("PHYSDEVDRIVER");
if (!driver)
driver = "(unknown)";
devpath = getenv("DEVPATH");
firmware = getenv("FIRMWARE");
action = getenv("ACTION");
if (!devpath || !firmware || !action || strcmp(action,"add") != 0) {
err("missing devpath, action or firmware");
exit(1);
}
dbg("try to load firmware '%s' for '%s'", firmware, devpath);
set_loading(devpath, 1);
snprintf(fw_path, sizeof(fw_path), "%s/%s", FIRMWARE_PATH, firmware);
fw_path[sizeof(fw_path)-1] = '\0';
if (file_map(fw_path, &fw_buffer, &fw_buffer_size) != 0 || fw_buffer_size == 0) {
err("could not load firmware '%s' for '%s'", fw_path, devpath);
fw_buffer = NULL;
goto out_err;
}
snprintf(data_path, sizeof(data_path), "/sys/%s/data", devpath);
data_path[sizeof(data_path)-1] = '\0';
fw_fd = open(data_path, O_RDWR);
if (fw_fd < 0) {
rc = errno;
goto out_err;
}
count = 0;
while (count < fw_buffer_size) {
ssize_t c;
c = write(fw_fd, fw_buffer+count, fw_buffer_size-count);
if (c <= 0) {
rc = errno;
close(fw_fd);
goto out_err;
}
count += c;
}
close(fw_fd);
file_unmap(fw_buffer, fw_buffer_size);
set_loading(devpath, 0);
info("loaded '%s' for device '%s'", fw_path, devpath);
logging_close();
return 0;
out_err:
if (fw_buffer)
file_unmap(fw_buffer, fw_buffer_size);
set_loading(devpath, -1);
err("error loading '%s' for device '%s' with driver '%s'", fw_path, devpath, driver);
logging_close();
return rc;
}
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