[1/5] Show the physical device node of backlight class device.

Commit Message

Zhang Rui June 22, 2009, 3:31 a.m. UTC

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 <[e-mail]>
---
 drivers/acpi/video.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

Comments

Len Brown June 24, 2009, 3:24 a.m. UTC | #1

applied

thanks,
Len Brown, Intel Open Source Technology Center

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Patch

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 1bdfb37..9de143a 100644
--- 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,