Hi, I'm new to alsa development work so I would appreciate some advice.

I'm trying to add specific support for the Behringer UCG102 Guitar Link USB interface. This is a simple device based on a TI codec. The aim is twofold:

a) To provide a more descriptive name, as it currently describes itself as the generic TI device

This was easy... I've included the following in usbquirks.h:

/* Behringer UCG102 Guitar Link */ { USB_DEVICE(0x08bb, 0x2902), .driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) { .vendor_name = "Behringer", .product_name = "Guitar Link UCG102", .ifnum = QUIRK_ANY_INTERFACE, .type = QUIRK_COMPOSITE, } },

b) To include more specific support for the characteristics of the UCG102, such as sample rate and so on (if required). I suspect something is required in this respect because when you connect it, dmesg reports "cannot get freq at ep 0x84". I also get a lot of xruns with this device. I suspect it's not reporting itself properly to ALSA and isn't getting set up with the right settings. Of course, I may be completely wrong.

I've attached the lsusb output for this. Can anyone help me decode this and help me understand what settings I need to configure?

Cheers,