thinkpad-acpi: find ACPI video device by synthetic HID
authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>
Tue, 10 Aug 2010 02:48:18 +0000 (23:48 -0300)
committerMatthew Garrett <mjg@redhat.com>
Mon, 16 Aug 2010 15:54:47 +0000 (11:54 -0400)
commit122f26726b5e16174bf8a707df14be1d93c49d62
tree7e71e1fa0c2dda912796f1cb9fd1f1f71bb872e4
parent52d7ee558d3babb4918eed6769f593adc1b6616e
thinkpad-acpi: find ACPI video device by synthetic HID

The Linux ACPI core locates the ACPI video devices for us and marks them
with ACPI_VIDEO_HID.  Use that information to locate the video device
instead of a half-baked hunt for _BCL.

This uncouples the detection of the number of backlight brightness
levels on ThinkPads from the ACPI paths in vid_handle.

With this change, the driver should be able to always detect whether the
ThinkPad uses a 8-level or 16-level brightness scale even on newer
models for which the vid_handle paths have not been updated yet.

It will skip deactivated devices in the ACPI device tree, which is a
change in behaviour.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
drivers/platform/x86/thinkpad_acpi.c