Show the physical device node of backlight class device.

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>

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 1bdfb37377e32d58bcd1f3e35e858c1cc681aa5c..9de143af3625908f6d43e471b255c76d56af1cd5 100644 (file)
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -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,