support the Roland UA-4FX2 card

[GitHub issues - opened]

alsa-project/alsa-lib issue #81 was opened from kalashnikov2:

hi

i'm trying to use this audio card with a Raspberry pi and y get this from the command dmesg on linux console

```
usb 3-2: new high-speed USB device number 6 using xhci_hcd
usb 3-2: New USB device found, idVendor=0582, idProduct=01e2, bcdDevice= 0.2b
usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 3-2: Product: UA-4FX2
usb 3-2: Manufacturer: ROLAND
mc: Linux media interface: v0.10
usbcore: registered new interface driver snd-usb-audio
usb 3-2: Unable to change format on ep #8e: already in use
usb 3-2: Unable to change format on ep #8e: already in use
:
:
```

and when i try to select the device on a program get this

```
ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm_route.c:869:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_oss.c:377:(_snd_pcm_oss_open) Unknown field port
ALSA lib pcm_oss.c:377:(_snd_pcm_oss_open) Unknown field port
ALSA lib pcm_usb_stream.c:486:(_snd_pcm_usb_stream_open) Invalid type for card
ALSA lib pcm_usb_stream.c:486:(_snd_pcm_usb_stream_open) Invalid type for card
```
it seems that the card is not supported by ALSA lib.
How is the procedure to add new cards to the driver?

How can I help to do this?

Thank you

Issue URL     : https://github.com/alsa-project/alsa-lib/issues/81
Repository URL: https://github.com/alsa-project/alsa-lib