Input: serio - export id.type, id.proto, id.id and id.extra as

       sysfs attributes to assist hotplug scripts in recovering
       lost boot-time serio hotplug events.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>

drivers/input/serio/serio.c

@@ -354,6 +354,30 @@ static ssize_t serio_show_description(struct device *dev, char *buf)
 	return sprintf(buf, "%s\n", serio->name);
 }
 
+static ssize_t serio_show_id_type(struct device *dev, char *buf)
+{
+	struct serio *serio = to_serio_port(dev);
+	return sprintf(buf, "%02x\n", serio->id.type);
+}
+
+static ssize_t serio_show_id_proto(struct device *dev, char *buf)
+{
+	struct serio *serio = to_serio_port(dev);
+	return sprintf(buf, "%02x\n", serio->id.proto);
+}
+
+static ssize_t serio_show_id_id(struct device *dev, char *buf)
+{
+	struct serio *serio = to_serio_port(dev);
+	return sprintf(buf, "%02x\n", serio->id.id);
+}
+
+static ssize_t serio_show_id_extra(struct device *dev, char *buf)
+{
+	struct serio *serio = to_serio_port(dev);
+	return sprintf(buf, "%02x\n", serio->id.extra);
+}
+
 static ssize_t serio_rebind_driver(struct device *dev, const char *buf, size_t count)
 {
 	struct serio *serio = to_serio_port(dev);
@@ -410,6 +434,10 @@ static ssize_t serio_set_bind_mode(struct device *dev, const char *buf, size_t c
 
 static struct device_attribute serio_device_attrs[] = {
 	__ATTR(description, S_IRUGO, serio_show_description, NULL),
+	__ATTR(id_type, S_IRUGO, serio_show_id_type, NULL),
+	__ATTR(id_proto, S_IRUGO, serio_show_id_proto, NULL),
+	__ATTR(id_id, S_IRUGO, serio_show_id_id, NULL),
+	__ATTR(id_extra, S_IRUGO, serio_show_id_extra, NULL),
 	__ATTR(drvctl, S_IWUSR, NULL, serio_rebind_driver),
 	__ATTR(bind_mode, S_IWUSR | S_IRUGO, serio_show_bind_mode, serio_set_bind_mode),
 	__ATTR_NULL