Input: i8042 - bypass AUX IRQ delivery test on laptops

It seems that many laptops do not fully implement AUX LOOP command in
their keyboard controllers, causing issues with touchpad detection.
We know however that almost every laptop/portable uses a PS/2 pointing
device and, even if user disables it in favor of an external mouse,
the system will not use IRQ 12 for anything else. Therefore we may
bypass AUX IRQ delivery test when running on a laptop and assume that
it is routed properly.

Just to be safe we require the box to have good PNP data in order to
bypass the test.

[Jin Dongming <jin.dongming@np.css.fujitsu.com>: fix crash caused
 by missing terminator in the DMI table]

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
index 9f5c0506242f..b53a015bf8a5 100644
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -83,6 +83,8 @@ module_param_named(debug, i8042_debug, bool, 0600);
 MODULE_PARM_DESC(debug, "Turn i8042 debugging mode on and off");
 #endif
 
+static bool i8042_bypass_aux_irq_test;
+
 #include "i8042.h"
 
 static DEFINE_SPINLOCK(i8042_lock);
@@ -641,7 +643,7 @@ static int __devinit i8042_check_aux(void)
  * used it for a PCI card or somethig else.
  */
 
-        if (i8042_noloop || aux_loop_broken) {
+        if (i8042_noloop || i8042_bypass_aux_irq_test || aux_loop_broken) {
 /*
  * Without LOOP command we can't test AUX IRQ delivery. Assume the port
  * is working and hope we are right.