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1# Copyright 2014 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
5import array
6import struct
7
8import common
9from autotest_lib.client.cros.cellular.mbim_compliance import mbim_channel
10from autotest_lib.client.cros.cellular.mbim_compliance import mbim_constants
11from autotest_lib.client.cros.cellular.mbim_compliance import mbim_errors
12from autotest_lib.client.cros.cellular.mbim_compliance \
13        import mbim_message_request
14from autotest_lib.client.cros.cellular.mbim_compliance \
15        import mbim_message_response
16from autotest_lib.client.cros.cellular.mbim_compliance \
17        import mbim_test_base
18from autotest_lib.client.cros.cellular.mbim_compliance.sequences \
19        import get_descriptors_sequence
20from autotest_lib.client.cros.cellular.mbim_compliance.sequences \
21        import mbim_open_generic_sequence
22
23
24class cellular_MbimComplianceCM08(mbim_test_base.MbimTestBase):
25    """
26    CM_08 Validation of InformationBuffer in case of a failure in
27    MBIM_COMMAND_MSG.
28
29    This test verifies that in case of a command failure the buffer in the
30    MBIM_COMMAND_DONE response is empty.
31
32    Reference:
33        [1] Universal Serial Bus Communication Class MBIM Compliance Testing: 40
34        http://www.usb.org/developers/docs/devclass_docs/MBIM-Compliance-1.0.pdf
35    """
36    version = 1
37
38    def run_internal(self):
39        """ Run CM_08 test. """
40        # Precondition
41        descriptors = get_descriptors_sequence.GetDescriptorsSequence(
42                self.device_context).run()
43        self.device_context.update_descriptor_cache(descriptors)
44        mbim_open_generic_sequence.MBIMOpenGenericSequence(
45                self.device_context).run()
46
47        # Step 1
48        device_context = self.device_context
49        descriptor_cache = device_context.descriptor_cache
50        command_message = mbim_message_request.MBIMCommand(
51                device_service_id=mbim_constants.UUID_BASIC_CONNECT.bytes,
52                cid=mbim_constants.MBIM_CID_RADIO_STATE,
53                command_type=mbim_constants.COMMAND_TYPE_SET,
54                information_buffer_length=4,
55                payload_buffer=array.array('B', struct.pack('I', 2)))
56        packets = mbim_message_request.generate_request_packets(
57                command_message,
58                device_context.max_control_transfer_size)
59        channel = mbim_channel.MBIMChannel(
60                device_context._device,
61                descriptor_cache.mbim_communication_interface.bInterfaceNumber,
62                descriptor_cache.interrupt_endpoint.bEndpointAddress,
63                device_context.max_control_transfer_size)
64        response_packets = channel.bidirectional_transaction(*packets)
65        channel.close()
66
67        # Step 2
68        response_message = mbim_message_response.parse_response_packets(
69                response_packets)
70
71        # Step 3
72        if ((response_message.message_type !=
73             mbim_constants.MBIM_COMMAND_DONE) or
74            (response_message.status_codes ==
75             mbim_constants.MBIM_STATUS_SUCCESS) or
76            response_message.information_buffer_length != 0):
77            mbim_errors.log_and_raise(mbim_errors.MBIMComplianceAssertionError,
78                                      'mbim1.0:9.4.5#3')
79