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    ACPI: thinkpad-acpi: revert new 2.6.23 CONFIG_THINKPAD_ACPI_INPUT_ENABLED option · ff80f137
    Henrique de Moraes Holschuh 提交于
    Revert new 2.6.23 CONFIG_THINKPAD_ACPI_INPUT_ENABLED Kconfig option because
    it would create a legacy we don't want to support.
    
    CONFIG_THINKPAD_ACPI_INPUT_ENABLED was added to try to fix an issue that is
    now moot with the addition of the netlink ACPI event report interface to
    the ACPI core.
    
    Now that ACPI core can send events over netlink, we can use a different
    strategy to keep backwards compatibility with older userspace, without the
    need for the CONFIG_THINKPAD_ACPI_INPUT_ENABLED games.  And it arrived
    before CONFIG_THINKPAD_ACPI_INPUT_ENABLED made it to a stable mainline
    kernel, even, which is Good.
    
    This patch is in sync with some changes to thinkpad-acpi backports, that
    will keep things sane for userspace across different combinations of kernel
    versions, thinkpad-acpi backports (or the lack thereof), and userspace
    capabilities:
    
    Unless a module parameter is used, thinkpad-acpi will now behave in such a
    way that it will work well (by default) with userspace that still uses only
    the old ACPI procfs event interface and doesn't care for thinkpad-acpi
    input devices.
    
    It will also always work well with userspace that has been updated to use
    both the thinkpad-acpi input devices, and ACPI core netlink event
    interface, regardless of any module parameter.
    
    The module parameter was added to allow thinkpad-acpi to work with
    userspace that has been partially updated to use thinkpad-acpi input
    devices, but not the new ACPI core netlink event interface.  To use this
    mode of hot key reporting, one has to specify the hotkey_report_mode=2
    module parameter.
    
    The thinkpad-acpi driver exports the value of hotkey_report_mode through
    sysfs, as well.  thinkpad-acpi backports to older kernels, that do not
    support the new ACPI core netlink interface, have code to allow userspace
    to switch hotkey_report_mode at runtime through sysfs.  This capability
    will not be provided in mainline thinkpad-acpi as it is not needed there.
    Signed-off-by: NHenrique de Moraes Holschuh <hmh@hmh.eng.br>
    Cc: Michael S. Tsirkin <mst@dev.mellanox.co.il>
    Cc: Hugh Dickins <hugh@veritas.com>
    Cc: Richard Hughes <hughsient@gmail.com>
    Signed-off-by: NLen Brown <len.brown@intel.com>
    ff80f137
Kconfig 6.8 KB