Show the physical device node of backlight class device. (056c308d) · Commits · 戴 / test

Create symbol link from backlight class device to ACPI video device. More and more laptops are shipped with multiple ACPI video devices, while we export only one of them to userspace. With this patch applied, we can know which ACPI video device is used by "cat /sys/class/backlight/acpi_video0/device/path". Signed-off-by:

Zhang Rui <rui.zhang@intel.com> Signed-off-by:

Len Brown <len.brown@intel.com>

drivers/acpi/video.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -976,6 +976,11 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
		device->backlight->props.max_brightness = device->brightness->count-3;
		kfree(name);

		result = sysfs_create_link(&device->backlight->dev.kobj,
		&device->dev->dev.kobj, "device");
		if (result)
		printk(KERN_ERR PREFIX "Create sysfs link\n");

		device->cdev = thermal_cooling_device_register("LCD",
		device->dev, &video_cooling_ops);
		if (IS_ERR(device->cdev))
		@@ -1990,6 +1995,7 @@ static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
		status = acpi_remove_notify_handler(device->dev->handle,
		ACPI_DEVICE_NOTIFY,
		acpi_video_device_notify);
		sysfs_remove_link(&device->backlight->dev.kobj, "device");
		backlight_device_unregister(device->backlight);
		if (device->cdev) {
		sysfs_remove_link(&device->dev->dev.kobj,

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