kbdmux(4) keyboard multiplexer integration

o Add two new ioctl's KBADDKBD and KBRELKBD. These are used to add and remove
  keyboard to (and from) kbdmux(4) keyboard multiplexer;

o Introduce new kbd_find_keyboard2() function. It does exactly the same job
  as kbd_find_keyboard() function except it allows to specify starting index.
  This function can be used to iterate over keyboards array;

o Re-implement kbd_find_keyboard() as call to kbd_find_keyboard2() with starting
  index of zero;

o Make sure syscons(4) passed KBADDKBD and KBRELKBD ioctl's onto currently
  active keyboard.

These changes should not have any visible effect.

MFC after:	1 week

1 files changed, 7 insertions, 0 deletions

diff --git a/sys/dev/syscons/syscons.c b/sys/dev/syscons/syscons.c
index 238c83f..8daca00 100644
--- a/sys/dev/syscons/syscons.c
+++ b/sys/dev/syscons/syscons.c
@@ -1164,6 +1164,13 @@ scioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
 	*(int *)data = scp->status & LED_MASK;
 	return 0;
 
+    case KBADDKBD:		/* add/remove keyboard to/from mux */
+    case KBRELKBD:
+	error = kbd_ioctl(sc->kbd, cmd, data);
+	if (error == ENOIOCTL)
+	    error = ENODEV;
+	return error;
+
     case CONS_SETKBD: 		/* set the new keyboard */
 	{
 	    keyboard_t *newkbd;