multi-touch-dev team mailing list archive

[Florian Echtler <floe@xxxxxxxxxxxxxx>]

On 11.05.2012 14:20, Henrik Rydberg wrote:
>>> Better yet, from the protocol details, it looks like it would be
>>> straight-forward to write an MT driver directly.
>> Can you suggest a kernel driver which I could use as base?
> Sure, drivers/input/mouse/bcm5974.c seems like a candidate. It also
> uses fixed endpoints directly.
Thanks, I'll look into it.

>> Also, slightly technical issue: the Surface has one single USB interface
>> with several bulk endpoints: one for coordinate data, one for raw image
>> data. AFAICT it's not possible to handle different endpoints in the same
>> interface with different drivers? Consequently, the MT driver should
>> also provide some sort of a video interface... (probably not a full V4L
>> interface, though, as there aren't any adjustable parameters to speak of).
> In anticipation of the pixelsense technique, I started scetching on a
> memory-mapped input interface some time ago. It would be useful also
> for the MS touchmouse. Let's see where we end up.
Right, an mmap interface would probably be a bit more efficient (saves
one buffer copy?).

> If possible, it would be great to get the full output of 'lsusb -vvv
> -d 045e:0775 > lsusb-045e:0775.dat', issued when no drivers are bound
> to the device.
Attached.

Florian
-- 
SENT FROM MY PDP-11

Bus 002 Device 002: ID 045e:0775 Microsoft Corp. 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x045e Microsoft Corp.
  idProduct          0x0775 
  bcdDevice            0.00
  iManufacturer           1 
  iProduct                2 
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           60
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xc0
      Self Powered
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           6
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x86  EP 6 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x08  EP 8 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0

T:  Bus=02 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  2 Spd=480 MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=045e ProdID=0775 Rev=00.00
S:  Manufacturer=Microsoft
S:  Product=Vision Input Processor
C:  #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr=0mA
I:  If#= 0 Alt= 0 #EPs= 6 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)