• Henrique de Moraes Holschuh's avatar
    ACPI: thinkpad-acpi: add tablet-mode reporting · 6c231bd5
    Henrique de Moraes Holschuh authored
    A quick study of the 0x5009/0x500A HKEY event on the X61t DSDT revealed the
    existence of the EC HTAB register (EC 0x0f, bit 7), and a compare with the
    X41t DSDT shows that HKEY.MHKG can be used to verify if the ThinkPad is
    tablet-capable (MHKG present), and in tablet mode (bit 3 of MHKG return is
    set).
    
    Add an attribute to report this information, "hotkey_tablet_mode".  This
    attribute has poll()/select() support, and can be used along with EV_SW
    SW_TABLET_MODE to hook userspace to tablet events.
    Signed-off-by: default avatarHenrique de Moraes Holschuh <hmh@hmh.eng.br>
    Signed-off-by: default avatarLen Brown <len.brown@intel.com>
    6c231bd5
thinkpad-acpi.txt 52.3 KB