Writing HID driver for a USB phone handset IPEVO VP170 (0x1778:0x0403)

Hi,

USB drivers in general are something a little new to me, but I picked up a USB
phone handset a little while ago, and while the USB-Audio portion of it works
great, none of the buttons actually do anything, and the LED doesn't light up
yet.

Here's the manuf's page on the phone: http://www.ipevo.com/v2/prod/p111444.htm

libhid appears to need hackery as it only looks at the EP1IN endpoint, while
this device uses EP3IN for the keypad, even fixing that to do a lookup of the
correct input and interface number it still doesn't like the unit, so I figured
probably better to post here and see if somebody had better pointers to being
able to use the data. A userspace app would probably be the most use, but I'll
settle for actually managing to receive the data!

Using Pete's binary usbmon, I can see that each of the 25 buttons has a unique
code, and pressing said button repeatedly cycles a second byte through values
0-3 (looping).

usb 2-1: new full speed USB device using ohci_hcd and address 2
usb 2-1: configuration #1 chosen from 1 choice
input: ÿ Free-1 USB Phone as /class/input/input4
input: USB HID v1.00 Device [ÿ Free-1 USB Phone] on usb-0001:01:0b.1-1

The iManufacturer is set to 0xFF.

Here is the interface and endpoint for the controls. I find it odd that the HID
Report Descriptor is not present. I suspect it will contain the LED control as
well.

    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Devices
      bInterfaceSubClass      0 No Subclass
      bInterfaceProtocol      0 None
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.00
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      50
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0007  1x 7 bytes
        bInterval              10



-- 
Robin Hugh Johnson
Gentoo Linux Developer & Council Member
E-Mail     : [email protected]
GnuPG FP   : 11AC BA4F 4778 E3F6 E4ED  F38E B27B 944E 3488 4E85

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