Date: Sat, 24 Nov 2012 14:24:07 +0100 From: Niclas Zeising <zeising+freebsd@daemonic.se> To: Hans Petter Selasky <hselasky@c2i.net> Cc: freebsd-hackers@freebsd.org Subject: Re: Questions about USB, uhid, ukbd and quirks Message-ID: <50B0CA77.90501@daemonic.se> In-Reply-To: <201211241419.29050.hselasky@c2i.net> References: <50B0001C.6050202@daemonic.se> <50B0BC44.2090609@daemonic.se> <50B0C395.8060809@daemonic.se> <201211241419.29050.hselasky@c2i.net>
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On 11/24/12 14:19, Hans Petter Selasky wrote:
> On Saturday 24 November 2012 13:54:45 Niclas Zeising wrote:
>> On 11/24/12 13:23, Niclas Zeising wrote:
>>> On 11/24/12 13:17, Hans Petter Selasky wrote:
>>>> On Saturday 24 November 2012 12:13:49 Hans Petter Selasky wrote:
>>>>> On Saturday 24 November 2012 00:00:44 Niclas Zeising wrote:
>>>>>> Hi!
>>>>>> I have a couple of questions about USB.
>>>>>> I recently bought a new USB keyboard, a Logitech K120. When attaching
>>>>>> this to a FreeBSD system, however, it is detected as a hid device
>>>>>> (attaching to uhid) rather than a keyboard (attaching to ukbd). The
>>>>>> keyboard works fine, but I'm just curious as to why it doesn't use
>>>>>> ukbd.
>>>>>
>>>>>> The output from usbconfig for this keyboard is:
>>>>> Hi,
>>>>>
>>>>> It seems the UHID driver needs to be synced with UMS and UKBD
>>>>> regarding the
>>>>> detection logic. Can you try the attached patch and report back.
>>>>>
>>>>> --HPS
>>>>
>>>> One more thing to check:
>>>>
>>>> /etc/devd/usb.conf
>>>>
>>>> Is perhaps auto-loading uhid before ukbd, and that might also be part
>>>> of the
>>>> issue.
>>>
>>> Hi!
>>> Having ukbd in the kernel, and not uhid, makes uhid load as a module
>>> during boot and attach to the keyboard, even with your patch. I'm
>>> recompiling the kernel now with uhid as part of the kernel to see if it
>>> makes a difference. I'm not too confortable hacking /etc/devd/usb.conf,
>>> but if you can point me in the right direction I'll have a go at it.
>>> Regards!
>>
>> Having uhid in the kernel did not make a difference, it attached to the
>> keyboard (or rather, the keyboard attached to the uhid driver, I guess).
>> Regards!
>
> Could you dump the configuration descriptor of your device using usbconfig?
>
> usbconfig -d X.Y dump_curr_config_desc
>
> --HPS
Attached patch contains the dump. From my reading of the USB spec, it
seems that this keyboard has two interfaces, one that detects as a
keyboard, and might be the boot device, and one that's just a regular
hid. I might also be very wrong in this. :)
I have a dump from a keyboard that only attaches to ukbd, if you need
something to compare to. That keyboard, however, believes it's a liteon
keyboard, rather than a logitech keyboard. That, however, is probably
Logitech's fault.
Thank you for helping out!
Regards!
--
Niclas
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filename="usbkeyboard.dump"
ugen2.3: <USB Keyboard Logitech> at usbus2, cfg=0 md=HOST spd=LOW (1.5Mbps) pwr=ON
Configuration index 0
bLength = 0x0009
bDescriptorType = 0x0002
wTotalLength = 0x003b
bNumInterfaces = 0x0002
bConfigurationValue = 0x0001
iConfiguration = 0x0003 <U64.00_B0001>
bmAttributes = 0x00a0
bMaxPower = 0x002d
Interface 0
bLength = 0x0009
bDescriptorType = 0x0004
bInterfaceNumber = 0x0000
bAlternateSetting = 0x0000
bNumEndpoints = 0x0001
bInterfaceClass = 0x0003
bInterfaceSubClass = 0x0001
bInterfaceProtocol = 0x0001
iInterface = 0x0002 <USB Keyboard>
Additional Descriptor
bLength = 0x09
bDescriptorType = 0x21
bDescriptorSubType = 0x10
RAW dump:
0x00 | 0x09, 0x21, 0x10, 0x01, 0x00, 0x01, 0x22, 0x41,
0x08 | 0x00
Endpoint 0
bLength = 0x0007
bDescriptorType = 0x0005
bEndpointAddress = 0x0081 <IN>
bmAttributes = 0x0003 <INTERRUPT>
wMaxPacketSize = 0x0008
bInterval = 0x000a
bRefresh = 0x0000
bSynchAddress = 0x0000
Interface 1
bLength = 0x0009
bDescriptorType = 0x0004
bInterfaceNumber = 0x0001
bAlternateSetting = 0x0000
bNumEndpoints = 0x0001
bInterfaceClass = 0x0003
bInterfaceSubClass = 0x0000
bInterfaceProtocol = 0x0000
iInterface = 0x0002 <USB Keyboard>
Additional Descriptor
bLength = 0x09
bDescriptorType = 0x21
bDescriptorSubType = 0x10
RAW dump:
0x00 | 0x09, 0x21, 0x10, 0x01, 0x00, 0x01, 0x22, 0x9f,
0x08 | 0x00
Endpoint 0
bLength = 0x0007
bDescriptorType = 0x0005
bEndpointAddress = 0x0082 <IN>
bmAttributes = 0x0003 <INTERRUPT>
wMaxPacketSize = 0x0004
bInterval = 0x00ff
bRefresh = 0x0000
bSynchAddress = 0x0000
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