ALSA: usb-audio: Add Pioneer DJ DJM-900NXS2 support

Pioneer DJ DJM-900NXS2 is a widely used DJ mixer with 2 audio USB
interfaces. Both have a MIDI controller, 10 playback and 12 capture
channels. Audio endpoints are vendor-specific and 3 files need to be
patched. All playback and capture channels work fine with all supported
sample rates (44.1k, 48k, 96k). Patches are attached.

Signed-off-by: Dmitry Panchenko <dmitry@d-systems.ee>
Link: https://lore.kernel.org/r/48ab19ff-3303-9bf8-ed0e-bcb31d8537eb@d-systems.ee
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/pcm.c

@@ -370,6 +370,10 @@ static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
 		ep = 0x81;
 		ifnum = 2;
 		goto add_sync_ep_from_ifnum;
+	case USB_ID(0x2b73, 0x000a): /* Pioneer DJ DJM-900NXS2 */
+		ep = 0x82;
+		ifnum = 0;
+		goto add_sync_ep_from_ifnum;
 	case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
 		/* BOSS Katana amplifiers do not need quirks */
 		return 0;

sound/usb/quirks-table.h

@@ -3557,5 +3557,68 @@ ALC1220_VB_DESKTOP(0x26ce, 0x0a01), /* Asrock TRX40 Creator */
 	QUIRK_DEVICE_PROFILE("Gigabyte", "Aorus Master Main Audio",
 			     "Gigabyte-Aorus-Master-Main-Audio")
 },
+{
+	/*
+	 * Pioneer DJ DJM-900NXS2
+	 * 10 channels playback & 12 channels capture @ 44.1/48/96kHz S24LE
+	 */
+	USB_DEVICE_VENDOR_SPEC(0x2b73, 0x000a),
+	.driver_info = (unsigned long) &(const struct snd_usb_audio_quirk) {
+		.ifnum = QUIRK_ANY_INTERFACE,
+		.type = QUIRK_COMPOSITE,
+		.data = (const struct snd_usb_audio_quirk[]) {
+			{
+				.ifnum = 0,
+				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
+				.data = &(const struct audioformat) {
+					.formats = SNDRV_PCM_FMTBIT_S24_3LE,
+					.channels = 10,
+					.iface = 0,
+					.altsetting = 1,
+					.altset_idx = 1,
+					.endpoint = 0x01,
+					.ep_attr = USB_ENDPOINT_XFER_ISOC|
+					    USB_ENDPOINT_SYNC_ASYNC,
+					.rates = SNDRV_PCM_RATE_44100|
+					    SNDRV_PCM_RATE_48000|
+					    SNDRV_PCM_RATE_96000,
+					.rate_min = 44100,
+					.rate_max = 96000,
+					.nr_rates = 3,
+					.rate_table = (unsigned int[]) {
+						44100, 48000, 96000
+					}
+				}
+			},
+			{
+				.ifnum = 0,
+				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
+				.data = &(const struct audioformat) {
+					.formats = SNDRV_PCM_FMTBIT_S24_3LE,
+					.channels = 12,
+					.iface = 0,
+					.altsetting = 1,
+					.altset_idx = 1,
+					.endpoint = 0x82,
+					.ep_attr = USB_ENDPOINT_XFER_ISOC|
+					    USB_ENDPOINT_SYNC_ASYNC|
+					    USB_ENDPOINT_USAGE_IMPLICIT_FB,
+					.rates = SNDRV_PCM_RATE_44100|
+					    SNDRV_PCM_RATE_48000|
+					    SNDRV_PCM_RATE_96000,
+					.rate_min = 44100,
+					.rate_max = 96000,
+					.nr_rates = 3,
+					.rate_table = (unsigned int[]) {
+						44100, 48000, 96000
+					}
+				}
+			},
+			{
+				.ifnum = -1
+			}
+		}
+	}
+},
 
 #undef USB_DEVICE_VENDOR_SPEC

sound/usb/quirks.c

@@ -1458,6 +1458,30 @@ static void set_format_emu_quirk(struct snd_usb_substream *subs,
 	subs->pkt_offset_adj = (emu_samplerate_id >= EMU_QUIRK_SR_176400HZ) ? 4 : 0;
 }
 
+
+/*
+ * Pioneer DJ DJM-900NXS2
+ * Device needs to know the sample rate each time substream is started
+ */
+static int pioneer_djm_set_format_quirk(struct snd_usb_substream *subs)
+{
+
+	/* Convert sample rate value to little endian */
+	u8 sr[3];
+
+	sr[0] = subs->cur_rate & 0xff;
+	sr[1] = (subs->cur_rate >> 8) & 0xff;
+	sr[2] = (subs->cur_rate >> 16) & 0xff;
+
+	/* Configure device */
+	usb_set_interface(subs->dev, 0, 1);
+	snd_usb_ctl_msg(subs->stream->chip->dev,
+		usb_rcvctrlpipe(subs->stream->chip->dev, 0),
+		0x01, 0x22, 0x0100, 0x0082, &sr, 0x0003);
+
+	return 0;
+}
+
 void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
 			      struct audioformat *fmt)
 {
@@ -1468,6 +1492,9 @@ void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
 	case USB_ID(0x041e, 0x3f19): /* E-Mu 0204 USB */
 		set_format_emu_quirk(subs, fmt);
 		break;
+	case USB_ID(0x2b73, 0x000a): /* Pioneer DJ DJM-900NXS2 */
+		pioneer_djm_set_format_quirk(subs);
+		break;
 	}
 }