/* remove sysfs_path if given */
if (strncmp(argv[1], sysfs_path, strlen(sysfs_path)) == 0)
devpath = &argv[1][strlen(sysfs_path)] ;
/* remove sysfs_path if given */
if (strncmp(argv[1], sysfs_path, strlen(sysfs_path)) == 0)
devpath = &argv[1][strlen(sysfs_path)] ;