Add AP command to set AP transmit power

server/site_linux_router.py

 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import logging, re, time
 from autotest_lib.client.common_lib import error
 from autotest_lib.server import site_eap_tls
 
 def isLinuxRouter(router):
     router_uname = router.run('uname').stdout
@@ skipping 314 matching lines @@
         else:
             raise error.TestFail("Unable to delete bridge %s: %s" %
                                  (self.bridgeif, result.stderr))
 
 
         self.hostapd['configured'] = False
 
 
     def get_ssid(self):
         return self.hostapd['conf']['ssid']
+
+
+    def set_txpower(self, params):
+        self.router.run("%s dev %s set txpower %s" %
+                        (self.cmd_iw, params.get('interface',
+                                                 self.hostapd['interface']),
+                         params.get('power', 'auto')))