The patch titled
acpi: tie ACPI backlight devices to PCI devices if possible
has been added to the -mm tree. Its filename is
acpi-tie-acpi-backlight-devices-to-pci-devices-if-possible.patch
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------------------------------------------------------
Subject: acpi: tie ACPI backlight devices to PCI devices if possible
From: Matthew Garrett <mjg@xxxxxxxxxx>
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@xxxxxxxxxx>
Cc: Richard Purdie <rpurdie@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Alex Deucher <alexdeucher@xxxxxxxxx>
Cc: Ben Skeggs <bskeggs@xxxxxxxxxx>
Cc: Zhang Rui <rui.zhang@xxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Cc: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/acpi/video.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff -puN drivers/acpi/video.c~acpi-tie-acpi-backlight-devices-to-pci-devices-if-possible drivers/acpi/video.c
--- a/drivers/acpi/video.c~acpi-tie-acpi-backlight-devices-to-pci-devices-if-possible
+++ a/drivers/acpi/video.c
@@ -782,6 +782,9 @@ static void acpi_video_device_find_cap(s
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(s
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);
_
Patches currently in -mm which might be from mjg@xxxxxxxxxx are
acerhdf-add-support-for-aspire-1410-bios-v13314.patch
backlight-add-backlight-type.patch
backlight-add-backlight-type-fix.patch
i915-add-native-backlight-control.patch
radeon-expose-backlight-class-device-for-legacy-lvds-encoder.patch
radeon-expose-backlight-class-device-for-legacy-lvds-encoder-update.patch
nouveau-change-the-backlight-parent-device-to-the-connector-not-the-pci-dev.patch
acpi-tie-acpi-backlight-devices-to-pci-devices-if-possible.patch
mbp_nvidia_bl-remove-dmi-dependency.patch
mbp_nvidia_bl-check-that-the-backlight-control-functions.patch
mbp_nvidia_bl-rename-to-apple_bl.patch
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