ACPI: EC: Fix "no battery" regression

Restore deleted call to register query methods.

http://bugzilla.kernel.org/show_bug.cgi?id=8886

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/ec.c

@@ -651,6 +651,19 @@ static struct acpi_ec *make_acpi_ec(void)
 	return ec;
 }
 
+static acpi_status
+acpi_ec_register_query_methods(acpi_handle handle, u32 level,
+			       void *context, void **return_value)
+{
+	struct acpi_namespace_node *node = handle;
+	struct acpi_ec *ec = context;
+	int value = 0;
+	if (sscanf(node->name.ascii, "_Q%x", &value) == 1) {
+		acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);
+	}
+	return AE_OK;
+}
+
 static acpi_status
 ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
 {
@@ -668,6 +681,10 @@ ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
 	if (ACPI_FAILURE(status))
 		return status;
 
+	/* Find and register all query methods */
+	acpi_walk_namespace(ACPI_TYPE_METHOD, handle, 1,
+			    acpi_ec_register_query_methods, ec, NULL);
+
 	/* Use the global lock for all EC transactions? */
 	acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock);