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platform/x86: add support for Huawei WMI hotkeys

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This driver adds support for missing hotkeys on some Huawei laptops.
Laptops such as the Matebook X have non functioning hotkeys. Whereas
newer laptops such as the Matebook X Pro come with working hotkeys out
of the box.

Old laptops, such as the Matebook X, report hotkey events through ACPI
device "\WMI0". However, new laptops, such as the Matebook X Pro, does
not have this WMI device.

All the hotkeys on the Matebook X Pro work fine without this patch
except (micmute, wlan, and huawei key). These keys and the brightness
keys report events to "\AMW0" ACPI device. One problem is that
brightness keys on the Matebook X Pro work without this patch. This
results in reporting two brightness key press events one is captured
by ACPI and another by this driver.

A solution would be to check if such event came from the "\AMW0" WMI
driver then skip reporting event. Another solution would be to leave
this to user-space to handle. Which can be achieved by using "hwdb"
tables and remap those keys to "unknown". This solution seems more
natural to me because it leaves the decision to user-space.

Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Ayman Bagabas <ayman.bagabas@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Ayman Bagabas
2018-12-12 18:07:58 -05:00
committed by Takashi Iwai
parent 8ac51bbc4c
commit bf4fb28c6e
3 changed files with 226 additions and 0 deletions
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17
drivers/platform/x86/Kconfig
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@@ -1292,6 +1292,23 @@ config INTEL_ATOMISP2_PM
To compile this driver as a module, choose M here: the module
will be called intel_atomisp2_pm.
config HUAWEI_WMI
tristate "Huawei WMI hotkeys driver"
depends on ACPI_WMI
depends on INPUT
select INPUT_SPARSEKMAP
select LEDS_CLASS
select LEDS_TRIGGERS
select LEDS_TRIGGER_AUDIO
select NEW_LEDS
help
This driver provides support for Huawei WMI hotkeys.
It enables the missing keys and adds support to the micmute
LED found on some of these laptops.
To compile this driver as a module, choose M here: the module
will be called huawei-wmi.
endif # X86_PLATFORM_DEVICES
config PMC_ATOM