libata-acpi: register/unregister device to/from power resource

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/acpi/power.c

@@ -390,6 +390,7 @@ void acpi_power_resource_unregister_device(struct device *dev, acpi_handle handl
 		__acpi_power_resource_unregister_device(dev,
 			list->handles[i]);
 }
+EXPORT_SYMBOL_GPL(acpi_power_resource_unregister_device);
 
 static int __acpi_power_resource_register_device(
 	struct acpi_power_managed_device *powered_device, acpi_handle handle)
@@ -460,6 +461,7 @@ no_power_resource:
 	printk(KERN_WARNING PREFIX "Invalid Power Resource to register!");
 	return -ENODEV;
 }
+EXPORT_SYMBOL_GPL(acpi_power_resource_register_device);
 
 /**
  * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in

drivers/ata/libata-acpi.c

@@ -1025,14 +1025,46 @@ static void ata_acpi_remove_pm_notifier(struct ata_device *dev)
 	}
 }
 
+static void ata_acpi_register_power_resource(struct ata_device *dev)
+{
+	struct scsi_device *sdev = dev->sdev;
+	acpi_handle handle;
+	struct device *device;
+
+	handle = ata_dev_acpi_handle(dev);
+	if (!handle)
+		return;
+
+	device = &sdev->sdev_gendev;
+
+	acpi_power_resource_register_device(device, handle);
+}
+
+static void ata_acpi_unregister_power_resource(struct ata_device *dev)
+{
+	struct scsi_device *sdev = dev->sdev;
+	acpi_handle handle;
+	struct device *device;
+
+	handle = ata_dev_acpi_handle(dev);
+	if (!handle)
+		return;
+
+	device = &sdev->sdev_gendev;
+
+	acpi_power_resource_unregister_device(device, handle);
+}
+
 void ata_acpi_bind(struct ata_device *dev)
 {
 	ata_acpi_add_pm_notifier(dev);
+	ata_acpi_register_power_resource(dev);
 }
 
 void ata_acpi_unbind(struct ata_device *dev)
 {
 	ata_acpi_remove_pm_notifier(dev);
+	ata_acpi_unregister_power_resource(dev);
 }
 
 static int compat_pci_ata(struct ata_port *ap)