Re: USB: driver for CM109 chipset

[Thomas Reitmayr <thomas@devbase.at>]

Hi Shaun,
the CM109 VID and PID are probably not included in the kernel's 
blacklisted device list (see static array hid_blacklist in hid-core.c). 
Just for your tests you can write a little tool to detach the usbhid 
driver and then load the cm109 module manually using modprobe or insmod.
An example for this tool (not using libusb) can be found at
http://www.devbase.at/svn/view.cgi/yealink-tools/trunk/detach-yealink.c?revision=1&root=experimental&view=markup
or inside the EEPROM tool below.
BTW, there is still the issue with varying key mappings among different 
models. The EEPROM contents might give a hint for distinguishing the 
models, it would be interesting if you could read the EEPROM and tell us 
what you see. The tool for this task can be found at
http://www.devbase.at/svn/view.cgi/cm109-tools/trunk/?root=experimental
Regards,
-Thomas

Shaun Jackman wrote:
> I am testing your cm109 driver with my Genius G-Talk USB phone. It
> identifies itself as a cm109 device (0d8c:000e C-Media Electronics,
> Inc.). I compiled and loaded the cm109 module. However when I plug the
> phone in the, the usbhid driver grabs the device rather than the cm109
> driver. The following snippet is from /proc/bus/usb/devices and shows
> the Class/Subclass/Protocol 3/0/0 device is nabbed by the usbhid
> driver. Why isn't the cm109 driver grabbing the device?
>
> Thanks for writing the driver, and I hope I can get it to work!
> Shaun
>
> T:  Bus=01 Lev=02 Prnt=02 Port=01 Cnt=02 Dev#=  7 Spd=12  MxCh= 0
> D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
> P:  Vendor=0d8c ProdID=000e Rev= 1.00
> S:  Product=Generic USB Audio Device
> C:* #Ifs= 4 Cfg#= 1 Atr=a0 MxPwr=100mA
> I:* If#= 0 Alt= 0 #EPs= 0 Cls=01(audio) Sub=01 Prot=00 Driver=snd-usb-audio
> I:* If#= 1 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
> I:  If#= 1 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
> E:  Ad=01(O) Atr=09(Isoc) MxPS= 200 Ivl=1ms
> I:* If#= 2 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
> I:  If#= 2 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
> E:  Ad=82(I) Atr=05(Isoc) MxPS= 100 Ivl=1ms
> I:* If#= 3 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=00 Prot=00 Driver=usbhid
> E:  Ad=83(I) Atr=03(Int.) MxPS=   4 Ivl=32ms
>
>
>