vendor-reset/userspace/vendor-reset.c

/*
Vendor Reset - Vendor Specific Reset
Copyright (C) 2020 Geoffrey McRae <geoff@hostfission.com>

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; either version 2 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include "vendor-reset.h"

int main(int argc, char * argv[])
{
  int ret;

  if (argc < 4)
  {
    fprintf(stderr,
      "Usage:\n"
      "  %s <domain> <bus> <devfn>\n",
      argv[0]
    );
    return -1;
  }

  int domain = atoi(argv[1]);
  int bus    = atoi(argv[2]);
  int devfn  = atoi(argv[3]);

  int fd = open("/dev/vendor_reset", O_RDWR);
  if (fd < 0)
  {
    perror("open");
    return fd;
  }

  struct vendor_reset_ioctl dev =
  {
    .domain = domain,
    .bus    = bus,
    .devfn  = devfn
  };

  ret = ioctl(fd, VENDOR_RESET_RESET, &dev);
  if (ret < 0)
  {
    perror("ioctl");
    goto err;
  }

err:
  close(fd);
  return 0;
}