Input: serio - support multiple child devices per single parent

Some (rare) serio devices need to have multiple serio children. One of
the examples is PS/2 multiplexer present on several TQC STKxxx boards,
which connect PS/2 keyboard and mouse to single tty port.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 3 insertions, 1 deletions

diff --git a/include/linux/serio.h b/include/linux/serio.h
index 111ad501b054..109b237603b6 100644
--- a/include/linux/serio.h
+++ b/include/linux/serio.h
@@ -41,7 +41,9 @@ struct serio {
         int (*start)(struct serio *);
         void (*stop)(struct serio *);
 
-        struct serio *parent, *child;
+        struct serio *parent;
+        struct list_head child_node;    /* Entry in parent->children list */
+        struct list_head children;
         unsigned int depth;             /* level of nesting in serio hierarchy */
 
         struct serio_driver *drv;       /* accessed from interrupt, must be protected by serio->lock and serio->sem */