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1import cStringIO
2
3from autotest_lib.client.bin import utils
4from autotest_lib.client.common_lib.cros import textfsm
5from autotest_lib.client.common_lib.cros.cfm.usb import usb_device
6
7
8class UsbDeviceCollector(object):
9    """Utility class for obtaining info about connected USB devices."""
10
11    USB_DEVICES_TEMPLATE = (
12        'Value Required Vendor ([0-9a-fA-F]+)\n'
13        'Value Required ProdID ([0-9A-Fa-f]+)\n'
14        'Value Required prev ([0-9a-fA-Z.]+)\n'
15        'Value Required Bus ([0-9.]+)\n'
16        'Value Required Port ([0-9.]+)\n'
17        'Value Required Lev ([0-9.]+)\n'
18        'Value Required Dev ([0-9.]+)\n'
19        'Value Required Prnt ([0-9.]+)\n'
20        'Value Manufacturer (.+)\n'
21        'Value Product (.+)\n'
22        'Value serialnumber ([0-9a-fA-Z\:\-]+)\n'
23        'Value cinterfaces (\d)\n'
24        'Value List intindex ([0-9])\n'
25        'Value List intdriver ([A-Za-z-\(\)]+)\n\n'
26        'Start\n'
27        '  ^USB-Device -> Continue.Record\n'
28        '  ^T:\s+Bus=${Bus}\s+Lev=${Lev}\s+Prnt=${Prnt}'
29        '\s+Port=${Port}.*Dev#=\s*${Dev}.*\n'
30        '  ^P:\s+Vendor=${Vendor}\s+ProdID=${ProdID}\sRev=${prev}\n'
31        '  ^S:\s+Manufacturer=${Manufacturer}\n'
32        '  ^S:\s+Product=${Product}\n'
33        '  ^S:\s+SerialNumber=${serialnumber}\n'
34        '  ^C:\s+\#Ifs=\s+${cinterfaces}\n'
35        '  ^I:\s+If\#=\s+${intindex}.*Driver=${intdriver}\n'
36    )
37
38    def __init__(self, host=None):
39        """
40        Constructor
41        @param host: An optional host object if running against a remote host.
42        """
43        self._host = host
44
45    def _extract_usb_data(self, rawdata):
46      """
47      Populate usb data into a list of dictionaries.
48      @param rawdata The output of "usb-devices" on CfM.
49      @returns list of dictionary, example dictionary:
50      {'Manufacturer': 'USBest Technology',
51      'Product': 'SiS HID Touch Controller',
52      'Vendor': '266e',
53      'intindex': ['0'],
54      'tport': '00',
55      'tcnt': '01',
56      'serialnumber': '',
57      'tlev': '03',
58      'tdev': '18',
59      'dver': '',
60      'intdriver': ['usbhid'],
61      'tbus': '01',
62      'prev': '03.00',
63      'cinterfaces': '1',
64      'ProdID': '0110',
65      'tprnt': '14'}
66      """
67      usbdata = []
68      rawdata += '\n'
69      re_table = textfsm.TextFSM(cStringIO.StringIO(self.USB_DEVICES_TEMPLATE))
70      fsm_results = re_table.ParseText(rawdata)
71      usbdata = [dict(zip(re_table.header, row)) for row in fsm_results]
72      return usbdata
73
74    def _collect_usb_device_data(self):
75        """Collecting usb device data."""
76        run = utils.run if self._host is None else self._host.run
77        usb_devices = (run('usb-devices', ignore_status=True).
78                       stdout.strip().split('\n\n'))
79        return self._extract_usb_data(
80            '\nUSB-Device\n'+'\nUSB-Device\n'.join(usb_devices))
81
82
83    def _create_usb_device(self, usbdata):
84        return usb_device.UsbDevice(
85            vid=usbdata['Vendor'],
86            pid=usbdata['ProdID'],
87            product=usbdata.get('Product', 'Not available'),
88            interfaces=usbdata['intdriver'],
89            bus=int(usbdata['Bus']),
90            level=int(usbdata['Lev']),
91            # We increment here by 1 because usb-devices reports 0-indexed port
92            # numbers where as lsusb reports 1-indexed. We opted to follow the
93            # the lsusb standard.
94            port=int(usbdata['Port']) + 1)
95
96    def get_usb_devices(self):
97        """
98        Returns the list of UsbDevices connected to the DUT.
99        @returns A list of UsbDevice instances.
100        """
101        usbdata = self._collect_usb_device_data()
102        data_and_devices = []
103        for data in usbdata:
104            usb_device = self._create_usb_device(data)
105            data_and_devices.append((data, usb_device))
106        # Make a pass to populate parents of the UsbDevices.
107        # We need parent ID and Device ID from the raw data since we do not
108        # care about storing those in a UsbDevice. That's why we bother
109        # iterating through the (data,UsbDevice) pairs.
110        for data, usb_device in data_and_devices:
111            parent_id = int(data['Prnt'])
112            bus = usb_device.bus
113            # Device IDs are not unique across busses. When finding a device's
114            # parent we look for a device with the parent ID on the same bus.
115            usb_device.parent = self._find_device_on_same_bus(
116                    data_and_devices, parent_id, bus)
117        return [x[1] for x in data_and_devices]
118
119    def _find_device_on_same_bus(self, data_and_devices, device_id, bus):
120        for data, usb_device in data_and_devices:
121            if int(data['Dev']) == device_id and usb_device.bus == bus:
122                return usb_device
123        return None
124
125    def get_devices_by_spec(self, *specs):
126        """
127        Returns all UsbDevices that match the any of the given specs.
128        @param specs instances of UsbDeviceSpec.
129        @returns a list UsbDevice instances.
130        """
131        spec_vid_pids = [spec.vid_pid for spec in specs]
132        return [d for d in self.get_usb_devices()
133                if d.vid_pid in spec_vid_pids]
134