From 2c97d3e55b70edf33b6e7f211bab8a748a0a2bcc Mon Sep 17 00:00:00 2001 From: "Luke D. Jones" Date: Wed, 30 Aug 2023 15:22:37 +1200 Subject: platform/x86: asus-wmi: add support for ASUS screenpad Add support for the WMI methods used to turn off and adjust the brightness of the secondary "screenpad" device found on some high-end ASUS laptops like the GX650P series and others. There are some small quirks with this device when considering only the raw WMI methods: 1. The Off method can only switch the device off 2. Changing the brightness turns the device back on 3. To turn the device back on the brightness must be > 1 4. When the device is off the brightness can't be changed (so it is stored by the driver if device is off). 5. Booting with a value of 0 brightness (retained by bios) means the bios will set a value of >0 <15 6. When the device is off it is "unplugged" asus_wmi sets the minimum brightness as 20 in general use, and 60 for booting with values <= min. The ACPI methods are used in a new backlight device named asus_screenpad. Signed-off-by: Luke D. Jones Link: https://lore.kernel.org/r/20230830032237.42987-2-luke@ljones.dev Reviewed-by: Hans de Goede Signed-off-by: Hans de Goede --- include/linux/platform_data/x86/asus-wmi.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux/platform_data') diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h index 16e99a1c37fc..63e630276499 100644 --- a/include/linux/platform_data/x86/asus-wmi.h +++ b/include/linux/platform_data/x86/asus-wmi.h @@ -58,6 +58,10 @@ #define ASUS_WMI_DEVID_KBD_BACKLIGHT 0x00050021 #define ASUS_WMI_DEVID_LIGHT_SENSOR 0x00050022 /* ?? */ #define ASUS_WMI_DEVID_LIGHTBAR 0x00050025 +/* This can only be used to disable the screen, not re-enable */ +#define ASUS_WMI_DEVID_SCREENPAD_POWER 0x00050031 +/* Writing a brightness re-enables the screen if disabled */ +#define ASUS_WMI_DEVID_SCREENPAD_LIGHT 0x00050032 #define ASUS_WMI_DEVID_FAN_BOOST_MODE 0x00110018 #define ASUS_WMI_DEVID_THROTTLE_THERMAL_POLICY 0x00120075 -- cgit