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1# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
2# Use of this source code is governed by a BSD-style license that can be
3# found in the LICENSE file.
4
5# WARNING(crbug.com/743265): This test is currently broken because the ability
6# to run client tests in the background from a server-side test has been
7# deleted.
8
9import logging, time
10
11from autotest_lib.server import autotest, test
12from autotest_lib.client.common_lib import error
13
14_SUSPEND_TIME = 60
15_SUSPEND_TIMEOUT = 30
16
17class power_USBHotplugInSuspend(test.test):
18    version = 1
19
20    def _switch_usbkey_power(self, on):
21        """
22        Turn on/off the power to the USB key.
23
24        @param on True to turn on, false otherwise.
25        """
26        if on:
27            self._host.servo.set('prtctl4_pwren', 'on')
28        else:
29            self._host.servo.set('prtctl4_pwren', 'off')
30        time.sleep(self._host.servo.USB_POWEROFF_DELAY)
31
32    def _get_usb_devices(self):
33        """
34        Get the USB device attached to the client.
35
36        Parses output from lsusb and returns the set of device IDs.
37        """
38        try:
39            lines = self._host.run('lsusb').stdout.strip().split('\n')
40        except:
41            raise error.TestError('Failed to get list of USB devices.')
42        devices = set(line.split()[5] for line in lines)
43        logging.info('USB Devices: %s' % (",".join(devices)))
44        return devices
45
46    def _suspend_client(self):
47        """
48        Start the client test power_KernelSuspend to suspend the client and
49        do not wait for it to finish.
50        """
51        client_at = autotest.Autotest(self._host)
52        # TODO(scottz): Add server side support to sys_power: crosbug.com/38115
53        client_at.run_test('power_KernelSuspend', background=True,
54                           seconds=_SUSPEND_TIME)
55
56    def _suspend_and_hotplug(self, insert):
57        """
58        Suspend the client and add/remove the USB key.  This assumes that a
59        USB key is plugged into the servo and is facing the DUT.
60
61        @param insert True to test insertion during suspend, False to test
62                      removal.
63        """
64        # Initialize the USB key and get the set of USB devices before
65        # suspending.
66        self._switch_usbkey_power(not insert)
67        before_suspend = self._get_usb_devices()
68
69        # Suspend the client and wait for it to go down before powering on/off
70        # the usb key.
71        self._suspend_client()
72        if not self._host.ping_wait_down(_SUSPEND_TIMEOUT):
73            raise error.TestError('Client failed to suspend.')
74        self._switch_usbkey_power(insert)
75
76        # Wait for the client to come back up (suspend time + some slack time).
77        # TODO(beeps): Combine the two timeouts in wait_up after
78        # crbug.com/221785 is resolved.
79        time.sleep(_SUSPEND_TIME)
80        if not self._host.wait_up(self._host.RESUME_TIMEOUT):
81            raise error.TestError('Client failed to resume.')
82
83        # Get the set of devices plugged in and make sure the change was
84        # detected.
85        after_suspend = self._get_usb_devices()
86        diff = after_suspend ^ before_suspend
87        if not diff:
88            raise error.TestFail('No USB changes detected after resuming.')
89
90        # Finally, make sure hotplug still works after resuming by switching
91        # the USB key's power once more.
92        self._switch_usbkey_power(not insert)
93        after_hotplug = self._get_usb_devices()
94        diff = after_hotplug ^ after_suspend
95        if not diff:
96            raise error.TestFail('No USB changes detected after hotplugging.')
97
98    def cleanup(self):
99        """
100        Reset the USB key to its initial state.
101        """
102        self._host.servo.switch_usbkey(self._init_usbkey_direction)
103        self._switch_usbkey_power(self._init_usbkey_power == 'on')
104        super(power_USBHotplugInSuspend, self).cleanup()
105
106    def run_once(self, host):
107        """
108        Tests adding and removing a USB device while the client is suspended.
109        """
110        self._host = host
111        self._init_usbkey_power = self._host.servo.get('prtctl4_pwren')
112        self._init_usbkey_direction = self._host.servo.get_usbkey_direction()
113
114        # Make sure the USB key is facing the DUT and is actually present.
115        self._host.servo.switch_usbkey('dut')
116        self._switch_usbkey_power(False)
117        before_insert = self._get_usb_devices()
118        self._switch_usbkey_power(True)
119        after_insert = self._get_usb_devices()
120        diff = after_insert - before_insert
121        logging.info('Inserted USB device(s): %s' % (",".join(diff)))
122        if not diff:
123            raise error.TestError('No new USB devices detected. Is a USB key '
124                                  'plugged into the servo?')
125
126        logging.info('Testing insertion during suspend.')
127        self._suspend_and_hotplug(True)
128        logging.info('Testing removal during suspend.')
129        self._suspend_and_hotplug(False)
130