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platform/x86: asus-nb-wmi: Do not load on Asus T100TA and T200TA

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[ Upstream commit 3bd12da7f50b8bc191fcb3bab1f55c582234df59 ]

asus-nb-wmi does not add any extra functionality on these Asus
Transformer books. They have detachable keyboards, so the hotkeys are
send through a HID device (and handled by the hid-asus driver) and also
the rfkill functionality is not used on these devices.

Besides not adding any extra functionality, initializing the WMI interface
on these devices actually has a negative side-effect. For some reason
the \_SB.ATKD.INIT() function which asus_wmi_platform_init() calls drives
GPO2 (INT33FC:02) pin 8, which is connected to the front facing webcam LED,
high and there is no (WMI or other) interface to drive this low again
causing the LED to be permanently on, even during suspend.

This commit adds a blacklist of DMI system_ids on which not to load the
asus-nb-wmi and adds these Transformer books to this list. This fixes
the webcam LED being permanently on under Linux.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hans de Goede 2020-04-23 00:05:59 +02:00 committed by Greg Kroah-Hartman
parent 661595bc36
commit 4276e29974
1 changed files with 24 additions and 0 deletions
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24
drivers/platform/x86/asus-nb-wmi.c
View file

@ -517,9 +517,33 @@ static struct asus_wmi_driver asus_nb_wmi_driver = {
.detect_quirks = asus_nb_wmi_quirks,
};
static const struct dmi_system_id asus_nb_wmi_blacklist[] __initconst = {
{
/*
* asus-nb-wm adds no functionality. The T100TA has a detachable
* USB kbd, so no hotkeys and it has no WMI rfkill; and loading
* asus-nb-wm causes the camera LED to turn and _stay_ on.
*/
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"),
},
},
{
/* The Asus T200TA has the same issue as the T100TA */
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T200TA"),
},
},
{} /* Terminating entry */
};
static int __init asus_nb_wmi_init(void)
{
if (dmi_check_system(asus_nb_wmi_blacklist))
return -ENODEV;
return asus_wmi_register_driver(&asus_nb_wmi_driver);
}