Hi,
I'm attempting to get started on a new driver for a fingerprint sensor.
I've sniffed some data but there are a few things in the logs which are
confusing.
The descriptor of the interface I'm working with:
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 8
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
URB 12 (see attachment) has RequestTypeReservedBits set to 0x40. With other
devices I usually see this as 0 (even though the actual RequestType would be
0x40). What does this mean? I guess its irrelevant.
URB 13 is the more interesting one.
It deals with endpoint 0x82, which the descriptor shows as a Bulk In endpoint,
but the log shows 64kb of data being sent to this endpoint with direction *out*.
And the response isn't recieved instantly either (almost like it is an
interrupt endpoint?) - about 20 more URBs bounce around before URB 13 comes
back. When it comes back, it has direction *in* and also comes with 64kb of data.
Is this non-standard behaviour, or do I need to read more about USB to get my
head around this? The behaviour that I'm familiar with on other devices is
where an urb is sent to a bulk in endpoint with no data and direction in, and
a result is recieved immediately after with direction in and a payload of data.
Thanks,
Daniel
[112 ms] >>> URB 12 going down >>>
-- URB_FUNCTION_VENDOR_DEVICE:
TransferFlags = 00000000 (USBD_TRANSFER_DIRECTION_OUT,
~USBD_SHORT_TRANSFER_OK)
TransferBufferLength = 00000001
TransferBuffer = 8231fee4
TransferBufferMDL = 00000000
00000000: 00
UrbLink = 00000000
RequestTypeReservedBits = 00000040
Request = 00000004
Value = 0000004e
Index = 00000000
[114 ms] UsbSnoop - MyInternalIOCTLCompletion(f890fdb0) : fido=81d4fd28,
Irp=8220f008, Context=81bbdb98, IRQL=2
[114 ms] <<< URB 12 coming back <<<
-- URB_FUNCTION_CONTROL_TRANSFER:
PipeHandle = 81c19c98
TransferFlags = 0000000a (USBD_TRANSFER_DIRECTION_OUT,
USBD_SHORT_TRANSFER_OK)
TransferBufferLength = 00000001
TransferBuffer = 8231fee4
TransferBufferMDL = 81d12858
UrbLink = 00000000
SetupPacket =
00000000: 40 04 4e 00 00 00 01 00
[114 ms] UsbSnoop - DispatchAny(f890e610) : IRP_MJ_INTERNAL_DEVICE_CONTROL
[114 ms] UsbSnoop - MyDispatchInternalIOCTL(f890fe80) : fdo=81d25e28,
Irp=81a9e2a8, IRQL=2
[127 ms] >>> URB 13 going down >>>
-- URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER:
PipeHandle = 81a60a04 [endpoint 0x00000082]
TransferFlags = 00000002 (USBD_TRANSFER_DIRECTION_OUT,
USBD_SHORT_TRANSFER_OK)
TransferBufferLength = 00010000
TransferBuffer = 81b270a4
TransferBufferMDL = 00000000
00000000: 10 40 80 01 21 01 00 08 bf 82 f3 c0 00 10 01 c7
00000010: 02 50 00 01 02 31 01 01 00 01 02 31 00 01 02 6c
00000020: 00 00 10 40 80 01 5a 00 00 00 bf 82 30 00 00 00
00000030: 38 26 05 55 02 5a 05 73 00 00 05 01 18 40 10 31
00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000000a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000000b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000000c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000000d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000000e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000000f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
snip loads of data (mostly zero)
0000ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0000ff90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0000ffa0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0000ffb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0000ffc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0000ffd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 02 00
0000ffe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0000fff0: 00 00 00 00 05 00 00 00 00 00 00 00 00 00 00 00
UrbLink = 00000000
[127 ms] UsbSnoop - DispatchAny(f890e610) : IRP_MJ_INTERNAL_DEVICE_CONTROL
[127 ms] UsbSnoop - MyDispatchInternalIOCTL(f890fe80) : fdo=81d25e28,
Irp=81b46bd0, IRQL=2
[127 ms] >>> URB 14 going down >>>
...20 urbs later...
[222 ms] <<< URB 34 coming back <<<
-- URB_FUNCTION_CONTROL_TRANSFER:
PipeHandle = 81c19c98
TransferFlags = 0000000a (USBD_TRANSFER_DIRECTION_OUT,
USBD_SHORT_TRANSFER_OK)
TransferBufferLength = 00000001
TransferBuffer = 81d266bc
TransferBufferMDL = 81b693e8
UrbLink = 00000000
SetupPacket =
00000000: 40 04 20 00 00 00 01 00
[223 ms] UsbSnoop - DispatchAny(f890e610) : IRP_MJ_PNP
(IRP_MN_QUERY_DEVICE_RELATIONS)
[223 ms] UsbSnoop - MyDispatchPNP(f8910ee0) : IRP_MJ_PNP
(IRP_MN_QUERY_DEVICE_RELATIONS)
[486 ms] UsbSnoop - MyInternalIOCTLCompletion(f890fdb0) : fido=81d4fd28,
Irp=81a9e2a8, Context=81b64800, IRQL=2
[498 ms] <<< URB 13 coming back <<<
-- URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER:
PipeHandle = 81a60a04 [endpoint 0x00000082]
TransferFlags = 00000003 (USBD_TRANSFER_DIRECTION_IN,
USBD_SHORT_TRANSFER_OK)
TransferBufferLength = 00010000
TransferBuffer = 81b270a4
TransferBufferMDL = 81d12858
00000000: 10 40 80 01 21 01 00 08 bf 82 f3 c0 00 10 01 c7
00000010: 02 50 00 01 02 31 01 01 00 01 02 31 00 01 02 6c
00000020: 00 00 10 40 80 01 5a 00 00 00 bf 82 30 00 00 00
00000030: 38 26 05 55 02 5a 05 73 00 00 05 01 18 40 10 31
00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
snip
0000fff0: 06 00 00 05 07 00 04 00 00 00 04 00 00 00 02 00
UrbLink = 00000000
