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| author | Matthew Garrett <mjg@redhat.com> | 2011-03-22 16:30:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-22 17:44:00 -0700 |
| commit | 9661e92c10a9775243c1ecb73373528ed8725a10 (patch) | |
| tree | 6540081a58b66142f3c84f93f76313be7e38b02b | |
| parent | 7eae3efa13c5d1c8e7d8dd0504ad524963b8add1 (diff) | |
| download | linux-3.10-9661e92c10a9775243c1ecb73373528ed8725a10.tar.gz linux-3.10-9661e92c10a9775243c1ecb73373528ed8725a10.tar.bz2 linux-3.10-9661e92c10a9775243c1ecb73373528ed8725a10.zip | |
acpi: tie ACPI backlight devices to PCI devices if possible
Dual-GPU machines may provide more than one ACPI backlight interface. Tie
the backlight device to the GPU in order to allow userspace to identify
the correct interface.
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: David Airlie <airlied@linux.ie>
Cc: Alex Deucher <alexdeucher@gmail.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Tested-by: Sedat Dilek <sedat.dilek@googlemail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/acpi/video.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index a9eec8c95a1..a18e497f1c3 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -782,6 +782,9 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device) if (acpi_video_backlight_support()) { struct backlight_properties props; + struct pci_dev *pdev; + acpi_handle acpi_parent; + struct device *parent = NULL; int result; static int count = 0; char *name; @@ -794,10 +797,20 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device) return; count++; + acpi_get_parent(device->dev->handle, &acpi_parent); + + pdev = acpi_get_pci_dev(acpi_parent); + if (pdev) { + parent = &pdev->dev; + pci_dev_put(pdev); + } + memset(&props, 0, sizeof(struct backlight_properties)); props.type = BACKLIGHT_FIRMWARE; props.max_brightness = device->brightness->count - 3; - device->backlight = backlight_device_register(name, NULL, device, + device->backlight = backlight_device_register(name, + parent, + device, &acpi_backlight_ops, &props); kfree(name); |