[PATCH 2/8] add _LCK support for dock

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support _LCK method, which is a optional method for hotplug

Signed-off-by: Shaohua Li <shaohua.li@xxxxxxxxx> 
---
 drivers/acpi/dock.c |   19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

Index: linux/drivers/acpi/dock.c
===================================================================
--- linux.orig/drivers/acpi/dock.c	2008-06-05 09:09:13.000000000 +0800
+++ linux/drivers/acpi/dock.c	2008-06-05 11:20:58.000000000 +0800
@@ -452,6 +452,22 @@ static inline void complete_undock(struc
 	ds->flags &= ~(DOCK_UNDOCKING);
 }
 
+static void dock_lock(struct dock_station *ds, int lock)
+{
+	struct acpi_object_list arg_list;
+	union acpi_object arg;
+	acpi_status status;
+
+	arg_list.count = 1;
+	arg_list.pointer = &arg;
+	arg.type = ACPI_TYPE_INTEGER;
+	arg.integer.value = !!lock;
+	status = acpi_evaluate_object(ds->handle, "_LCK", &arg_list, NULL);
+	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
+		printk(KERN_WARNING PREFIX "%s device failed\n",
+			lock ? "Locking" : "Unlocking");
+}
+
 /**
  * dock_in_progress - see if we are in the middle of handling a dock event
  * @ds: the dock station
@@ -577,6 +593,7 @@ static int handle_eject_request(struct d
 	dock_event(ds, event, UNDOCK_EVENT);
 	hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST);
 	undock(ds);
+	dock_lock(ds, 0);
 	eject_dock(ds);
 	if (dock_present(ds)) {
 		printk(KERN_ERR PREFIX "Unable to undock!\n");
@@ -616,6 +633,7 @@ static void dock_notify(acpi_handle hand
 			hotplug_dock_devices(ds, event);
 			complete_dock(ds);
 			dock_event(ds, event, DOCK_EVENT);
+			dock_lock(ds, 1);
 		}
 		break;
 	case ACPI_NOTIFY_DEVICE_CHECK:


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