Re: hid device not claimed but /dev/input/event exists

[Tomas Carnecky]

Jiri Kosina wrote:
> On Tue, 19 Feb 2008, Tomas Carnecky wrote:
>
> > usb 1-2.2: new full speed USB device using ehci_hcd and address 6
> > usb 1-2.2: configuration #1 chosen from 1 choice
> > HID device claimed by neither input, hiddev nor hidraw
> > input: Logitech Z-10 USB Speaker as
> > /devices/pci0000:00/0000:00:02.1/usb1/1-2/1-2.2/1-2.2:1.3/input/input4
> > input: USB HID v1.10 Device [Logitech Z-10 USB Speaker] on
> > usb-0000:00:02.1-2.2
> > Nobody claims the device and yet an evdev device shows up in /dev/input? That
>
> Yes, that looks indeed bogus.
>
> > I enabled HID_DEBUG, but no debug messages show up in my dmesg output, 
> > which is strange. 
>
> You have to modprobe the 'hid' module with 'debug=1' parameter. Please 
> send me the resulting output.

Attached is the dump from dmesg.

The device apparently has four 'interfaces' - whatever that is, see [1].
It seems like usbhid probes interface 2 (which is the LCD plus a few
buttons, probably the four just under the LCD, as described [1]).
Because usbhid doesn't know how to handle the buttons, it fails. But
then it probes interface 3 which is a 'proper' HID device with
well-defined buttons.

But still nothing shows up if I press the buttons. But something is
strange, neither does when I press buttons on my sidewinder pad. Unless
I 'cat /dev/input/event5' and then press the buttons, then they shows up
in dmesg. But that trick doesn't work with the Z-10 speakers. Maybe the 
alsa driver is interfering somehow?

[1]
http://forums.logitech.com/logitech/board/message?board.id=stereo_20&message.id=633#M633


usb 1-2.2: new full speed USB device using ehci_hcd and address 8
usb 1-2.2: configuration #1 chosen from 1 choice
drivers/hid/usbhid/hid-core.c: HID probe called for ifnum 2
drivers/hid/usbhid/hid-core.c: report descriptor (size 46, read 46) =  06 00 ff 09 00 a1 01 15 00 26 ff 00 75 08 95 08 06 00 ff 09 02 85 02 06 00 ff 09 03 81 02 09 04 95 03 b1 02 09 06 85 03 96 df 03 91 02 c0
drivers/hid/usbhid/hid-core.c: submitting ctrl urb: Get_Report wValue=0x0102 wIndex=0x0002 wLength=9
drivers/hid/usbhid/hid-core.c: submitting ctrl urb: Get_Report wValue=0x0302 wIndex=0x0002 wLength=4
  INPUT(2)[INPUT]
    Field(0)
      Usage(8)
        ff00.0002
        ff00.0003
        ff00.0003
        ff00.0003
        ff00.0003
        ff00.0003
        ff00.0003
        ff00.0003
      Logical Minimum(0)
      Logical Maximum(255)
      Report Size(8)
      Report Count(8)
      Report Offset(0)
      Flags( Variable Absolute )
  OUTPUT(3)[OUTPUT]
    Field(0)
      Usage(991)
        ff00.0006
        ff00.0006
        ff00.0006
        ff00.0006
        ff00.0006
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      Logical Minimum(0)
      Logical Maximum(255)
      Report Size(8)
      Report Count(991)
      Report Offset(0)
      Flags( Variable Absolute )
  FEATURE(2)[FEATURE]
    Field(0)
      Usage(3)
        ff00.0004
        ff00.0004
        ff00.0004
      Logical Minimum(0)
      Logical Maximum(255)
      Report Size(8)
      Report Count(3)
      Report Offset(0)
      Flags( Variable Absolute )
HID device claimed by neither input, hiddev nor hidraw
drivers/hid/usbhid/hid-core.c: HID probe called for ifnum 3
drivers/hid/usbhid/hid-core.c: report descriptor (size 41, read 41) =  05 0c 09 01 a1 01 09 e9 09 ea 09 e2 09 b3 09 b4 09 b5 09 b6 09 b7 09 cd 15 00 25 01 95 09 75 01 81 02 95 01 75 07 81 01 c0
drivers/hid/usbhid/hid-core.c: submitting ctrl urb: Get_Report wValue=0x0100 wIndex=0x0003 wLength=2
  INPUT[INPUT]
    Field(0)
      Usage(9)
        Consumer.00e9
        Consumer.00ea
        Consumer.00e2
        Consumer.00b3
        Consumer.00b4
        Consumer.00b5
        Consumer.00b6
        Consumer.00b7
        Consumer.00cd
      Logical Minimum(0)
      Logical Maximum(1)
      Report Size(1)
      Report Count(9)
      Report Offset(0)
      Flags( Variable Absolute )
drivers/hid/hid-input.c: Mapping: Consumer.00e9 ---> Key.VolumeUp
drivers/hid/hid-input.c: Mapping: Consumer.00ea ---> Key.VolumeDown
drivers/hid/hid-input.c: Mapping: Consumer.00e2 ---> Key.Mute
drivers/hid/hid-input.c: Mapping: Consumer.00b3 ---> Key.FastForward
drivers/hid/hid-input.c: Mapping: Consumer.00b4 ---> Key.Rewind
drivers/hid/hid-input.c: Mapping: Consumer.00b5 ---> Key.NextSong
drivers/hid/hid-input.c: Mapping: Consumer.00b6 ---> Key.PreviousSong
drivers/hid/hid-input.c: Mapping: Consumer.00b7 ---> Key.StopCD
drivers/hid/hid-input.c: Mapping: Consumer.00cd ---> Key.PlayPause
input: Logitech Z-10 USB Speaker as /devices/pci0000:00/0000:00:02.1/usb1/1-2/1-2.2/1-2.2:1.3/input/input6
input: USB HID v1.10 Device [Logitech Z-10 USB Speaker] on usb-0000:00:02.1-2.2
drivers/hid/hid-core.c: report (size 8) (unnumbered)
drivers/hid/hid-core.c: report 0 (size 8) =  00 00 28 00 00 00 00 00