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

[Dmitry Panchenko | d-Systems <dmitry@d-systems.ee>]

[-- Attachment #1: Type: text/plain, Size: 480 bytes --]

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>

--
Kind regards,
Dmitry Panchenko

d-Systems Ltd
Lai 6, Tartu 51005, Estonia
www.d-systems.ee


[-- Attachment #2: pcm.c.patch --]
[-- Type: text/x-patch, Size: 445 bytes --]

--- sound/usb/pcm.c	2020-04-23 11:38:27.000000000 +0300
+++ /root/linux-5.6.7/sound/usb/pcm.c	2020-05-01 14:17:54.785566648 +0300
@@ -365,6 +365,10 @@
 		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;


[-- Attachment #3: quirks.c.patch --]
[-- Type: text/x-patch, Size: 1159 bytes --]

--- sound/usb/quirks.c	2020-04-23 11:38:27.000000000 +0300
+++ /root/linux-5.6.7/sound/usb/quirks.c	2020-05-01 14:45:57.545650031 +0300
@@ -1414,6 +1414,30 @@
 	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)
 {
@@ -1424,6 +1448,9 @@
 	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;
 	}
 }
 


[-- Attachment #4: quirks-table.h.patch --]
[-- Type: text/x-patch, Size: 1830 bytes --]

--- sound/usb/quirks-table.h	2020-04-23 11:38:27.000000000 +0300
+++ /root/linux-5.6.7/sound/usb/quirks-table.h	2020-05-01 14:48:44.665672833 +0300
@@ -3592,5 +3592,68 @@
 		}
 	}
 },
+{
+	/*
+	 * 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