From b72cd8e0fa34d5491232c64b88e3eda35436eb57 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Mon, 22 Nov 2021 18:05:34 +0100 Subject: ACPI / x86: Add PWM2 on the Xiaomi Mi Pad 2 to the always_present list The Xiaomi Mi Pad 2 has backlit LEDs behind the capacitive menu, home and back buttons below the screen which are controlled by the PWM2 controller of the CHT SoC. This PWM2 controller gets hidden by the firmware, add it to the always_present_ids table so that we can use the PWM controller to control the backlighting of the buttons. Signed-off-by: Hans de Goede Signed-off-by: Rafael J. Wysocki --- drivers/acpi/x86/utils.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/acpi/x86') diff --git a/drivers/acpi/x86/utils.c b/drivers/acpi/x86/utils.c index b3fb428461c6..a2ae1ac41319 100644 --- a/drivers/acpi/x86/utils.c +++ b/drivers/acpi/x86/utils.c @@ -71,6 +71,12 @@ static const struct override_status_id override_status_ids[] = { PRESENT_ENTRY_HID("80860F09", "1", ATOM_SILVERMONT, {}), PRESENT_ENTRY_HID("80862288", "1", ATOM_AIRMONT, {}), + /* The Xiaomi Mi Pad 2 uses PWM2 for touchkeys backlight control */ + PRESENT_ENTRY_HID("80862289", "2", ATOM_AIRMONT, { + DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"), + DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"), + }), + /* * The INT0002 device is necessary to clear wakeup interrupt sources * on Cherry Trail devices, without it we get nobody cared IRQ msgs. -- cgit