From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Keith A. Milner" <maillist@superlative.org>
Subject: Re: Boss GT-001
Date: Thu, 08 Oct 2015 01:51:20 +0100
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On Tuesday 06 Oct 2015 20:58:01 Keith A. Milner wrote:
> OK, so it seems that this hardware is substantially the same as the GT-100
> which has previously (and recently) been raised as a problem on ALSA.

I'm getting somewhere...

With the following quirk I am getting audio playback with aplay. I have what 
seems like correct MIDI interfaces working (although not fully tested).

However, recording does not seem to work.

{
	/* Boss GT-001 Guitar Interface */
	USB_DEVICE(0x0582, 0x0187),
	.driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
		.vendor_name = "Boss",
		.product_name = "GT-001",
		.ifnum = QUIRK_ANY_INTERFACE,
		.type = QUIRK_COMPOSITE,
		.data = (const struct snd_usb_audio_quirk[]) {
		  	{
				.ifnum = 0,
				.type = QUIRK_IGNORE_INTERFACE
			},
			{
				.ifnum = 1,
				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
				.data = & (const struct audioformat) {
					.formats = SNDRV_PCM_FMTBIT_S32_LE,
					.channels = 4,
					.iface = 1,
					.altsetting = 1,
					.altset_idx = 1,
					.endpoint = 0x0d,
					.ep_attr = 0x05,
					.rates = SNDRV_PCM_RATE_44100,
					.rate_min = 44100,
					.rate_max = 44100,
					.nr_rates = 1,
					.rate_table = (unsigned int[]) { 44100 }
				}
			},
			{
				.ifnum = 2,
				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
				.data = & (const struct audioformat) {
					.formats = SNDRV_PCM_FMTBIT_S32_LE,
					.channels = 4,
					.iface = 2,
					.altsetting = 1,
					.altset_idx = 1,
					.endpoint = 0x8e,
					.ep_attr = 0x25,
					.rates = SNDRV_PCM_RATE_44100,
					.rate_min = 44100,
					.rate_max = 44100,
					.nr_rates = 1,
					.rate_table = (unsigned int[]) { 44100 }
				}
			},
			{
				.ifnum = 3,
				.type = QUIRK_MIDI_ROLAND
			},
			{
				.ifnum = 4,
				.type = QUIRK_IGNORE_INTERFACE
			},
			{
				.ifnum = -1
			}
		}
	}
},

Cheers,

Keith