staging: greybus: vibrator: remove KERNEL_VERSION checks

No need to support older kernel versions in the Greybus Vibrator driver,
so remove the checks as needed, we can now rely on all of the correct
driver core apis being present.
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/vibrator.c

@@ -108,9 +108,7 @@ ATTRIBUTE_GROUPS(vibrator);
 static struct class vibrator_class = {
 	.name		= "vibrator",
 	.owner		= THIS_MODULE,
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0)
 	.dev_groups	= vibrator_groups,
-#endif
 };
 
 static DEFINE_IDA(minors);
@@ -169,19 +167,6 @@ static int gb_vibrator_probe(struct gb_bundle *bundle,
 	}
 	vib->dev = dev;
 
-#if LINUX_VERSION_CODE <= KERNEL_VERSION(3,11,0)
-	/*
-	 * Newer kernels handle this in a race-free manner, by the dev_groups
-	 * field in the struct class up above.  But for older kernels, we need
-	 * to "open code this :(
-	 */
-	retval = sysfs_create_group(&dev->kobj, vibrator_groups[0]);
-	if (retval) {
-		device_unregister(dev);
-		goto err_ida_remove;
-	}
-#endif
-
 	INIT_DELAYED_WORK(&vib->delayed_work, gb_vibrator_worker);
 
 	gb_pm_runtime_put_autosuspend(bundle);
@@ -212,9 +197,6 @@ static void gb_vibrator_disconnect(struct gb_bundle *bundle)
 	if (cancel_delayed_work_sync(&vib->delayed_work))
 		turn_off(vib);
 
-#if LINUX_VERSION_CODE <= KERNEL_VERSION(3,11,0)
-	sysfs_remove_group(&vib->dev->kobj, vibrator_groups[0]);
-#endif
 	device_unregister(vib->dev);
 	ida_simple_remove(&minors, vib->minor);
 	gb_connection_disable(vib->connection);