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Input: i8042 - reset keyboard to fix Elantech touchpad detection 

On some laptops, keyboard needs to be reset in order to successfully detect
touchpad (e.g., some Gigabyte laptop models with Elantech touchpads).
Without resettin keyboard touchpad pretends to be completely dead.

Based on the original patch by Mateusz Jończyk this version has been
expanded to include DMI based detection & application of the fix
automatically on the affected models of laptops. This has been confirmed to
fix problem by three users already on three different models of laptops.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=81331
Cc: stable@vger.kernel.org
Signed-off-by: Srihari Vijayaraghavan <linux.bug.reporting@gmail.com>
Acked-by: Mateusz Jończyk <mat.jonczyk@o2.pl>
Tested-by: Srihari Vijayaraghavan <linux.bug.reporting@gmail.com>
Tested by: Zakariya Dehlawi <zdehlawi@gmail.com>
Tested-by: Guillaum Bouchard <guillaum.bouchard@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Srihari Vijayaraghavan 2015-01-07 16:25:53 -08:00 committed by Dmitry Torokhov
parent 4f0d4fac24
commit 148e9a711e
3 changed files with 47 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Documentation/kernel-parameters.txt
View File

@ -1243,6 +1243,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
i8042.notimeout [HW] Ignore timeout condition signalled by controller
i8042.reset [HW] Reset the controller during init and cleanup
i8042.unlock [HW] Unlock (ignore) the keylock
i8042.kbdreset [HW] Reset device connected to KBD port
i810= [HW,DRM]

32
drivers/input/serio/i8042-x86ia64io.h
View File

@ -745,6 +745,35 @@ static const struct dmi_system_id __initconst i8042_dmi_dritek_table[] = {
{ }
};
/*
* Some laptops need keyboard reset before probing for the trackpad to get
* it detected, initialised & finally work.
*/
static const struct dmi_system_id __initconst i8042_dmi_kbdreset_table[] = {
{
/* Gigabyte P35 v2 - Elantech touchpad */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
DMI_MATCH(DMI_PRODUCT_NAME, "P35V2"),
},
},
{
/* Aorus branded Gigabyte X3 Plus - Elantech touchpad */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
DMI_MATCH(DMI_PRODUCT_NAME, "X3"),
},
},
{
/* Gigabyte P34 - Elantech touchpad */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
DMI_MATCH(DMI_PRODUCT_NAME, "P34"),
},
},
{ }
};
#endif /* CONFIG_X86 */
#ifdef CONFIG_PNP
@ -1040,6 +1069,9 @@ static int __init i8042_platform_init(void)
if (dmi_check_system(i8042_dmi_dritek_table))
i8042_dritek = true;
if (dmi_check_system(i8042_dmi_kbdreset_table))
i8042_kbdreset = true;
/*
* A20 was already enabled during early kernel init. But some buggy
* BIOSes (in MSI Laptops) require A20 to be enabled using 8042 to

14
drivers/input/serio/i8042.c
View File

@ -67,6 +67,10 @@ static bool i8042_notimeout;
module_param_named(notimeout, i8042_notimeout, bool, 0);
MODULE_PARM_DESC(notimeout, "Ignore timeouts signalled by i8042");
static bool i8042_kbdreset;
module_param_named(kbdreset, i8042_kbdreset, bool, 0);
MODULE_PARM_DESC(kbdreset, "Reset device connected to KBD port");
#ifdef CONFIG_X86
static bool i8042_dritek;
module_param_named(dritek, i8042_dritek, bool, 0);
@ -789,6 +793,16 @@ static int __init i8042_check_aux(void)
if (i8042_toggle_aux(true))
return -1;
/*
* Reset keyboard (needed on some laptops to successfully detect
* touchpad, e.g., some Gigabyte laptop models with Elantech
* touchpads).
*/
if (i8042_kbdreset) {
pr_warn("Attempting to reset device connected to KBD port\n");
i8042_kbd_write(NULL, (unsigned char) 0xff);
}
/*
* Test AUX IRQ delivery to make sure BIOS did not grab the IRQ and
* used it for a PCI card or somethig else.