| commit | ed9e85d6c573cd4ee9f17791b96c2fc50921c1c2 | |
| author | Henrique de Moraes Holschuh <hmh@hmh.eng.br> | |
| Fri, 27 May 2011 01:52:30 +0000 (26 22:52 -0300) | ||
| committer | Henrique de Moraes Holschuh <hmh@hmh.eng.br> | |
| Fri, 27 May 2011 01:52:30 +0000 (26 22:52 -0300) | ||
| tree | 6c7ca84a404275ea6ef1ead2ff5daab4a3e26326 | treesnapshot (tar.gz zip) |
| parent | 9665db55313d8669ed4c5967ffdb616a86e5b690 | commitdiff |
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>
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>
| drivers/platform/x86/thinkpad_acpi.c | diffblobblamehistory |