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acpi: tie ACPI backlight devices to PCI devices if possible

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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>
This commit is contained in:
Matthew Garrett 2011-03-22 16:30:25 -07:00 committed by Linus Torvalds
parent 7eae3efa13
commit 9661e92c10
1 changed files with 14 additions and 1 deletions
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15
drivers/acpi/video.c
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@ -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);