Re: [alsa-devel] [PATCH v2] add native DSD support for XMOS based DACs

Jurgen Kramer wrote:

• /* XMOS based USB DACs */
• if (le16_to_cpu(chip->dev->descriptor.idVendor) == 0x20b1) {

• switch (le16_to_cpu(chip->dev->descriptor.idProduct)) {
  

• /* iFi Audio micro/nano iDSD */
  

• case 0x3008:
  

And you don't need to go through the descriptors; you can test chip->usb_id directly (see snd_usb_set_format_quirk()).

Regards, Clemens