[ALSA] Novation and MOTU USB MIDI support

USB generic driver
Rewrote USB MIDI protocol handling code to use callbacks
for each protocol;
added support for Novation and MOTU protocols;
changed detection code to allow interrupt endpoints.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

sound/usb/usbaudio.c

@@ -2968,6 +2968,8 @@ static int snd_usb_create_quirk(snd_usb_audio_t *chip,
 	case QUIRK_MIDI_FIXED_ENDPOINT:
 	case QUIRK_MIDI_YAMAHA:
 	case QUIRK_MIDI_MIDIMAN:
+	case QUIRK_MIDI_NOVATION:
+	case QUIRK_MIDI_MOTU:
 		return snd_usb_create_midi_interface(chip, iface, quirk);
 	case QUIRK_COMPOSITE:
 		return create_composite_quirk(chip, iface, quirk);

sound/usb/usbaudio.h

@@ -158,6 +158,8 @@ struct snd_usb_audio {
 #define QUIRK_AUDIO_EDIROL_UA700_UA25	7
 #define QUIRK_AUDIO_EDIROL_UA1000	8
 #define QUIRK_IGNORE_INTERFACE		9
+#define QUIRK_MIDI_NOVATION		10
+#define QUIRK_MIDI_MOTU			11
 
 typedef struct snd_usb_audio_quirk snd_usb_audio_quirk_t;
 typedef struct snd_usb_midi_endpoint_info snd_usb_midi_endpoint_info_t;
@@ -172,7 +174,10 @@ struct snd_usb_audio_quirk {
 
 /* data for QUIRK_MIDI_FIXED_ENDPOINT */
 struct snd_usb_midi_endpoint_info {
-	int8_t out_ep, in_ep;	/* ep number, 0 autodetect */
+	int8_t   out_ep;	/* ep number, 0 autodetect */
+	uint8_t  out_interval;	/* interval for interrupt endpoints */
+	int8_t   in_ep;	
+	uint8_t  in_interval;
 	uint16_t out_cables;	/* bitmask */
 	uint16_t in_cables;	/* bitmask */
 };
@@ -191,7 +196,9 @@ struct snd_usb_midi_endpoint_info {
 
 /* for QUIRK_AUDIO_EDIROL_UA700_UA25/UA1000, data is NULL */
 
-/* for QUIRK_IGNORE_INTERFACE, data is null */
+/* for QUIRK_IGNORE_INTERFACE, data is NULL */
+
+/* for QUIRK_MIDI_NOVATION and _MOTU, data is NULL */
 
 /*
  */

sound/usb/usbquirks.h

@@ -1018,16 +1018,25 @@ YAMAHA_DEVICE(0x7010, "UB99"),
 
 /* Mark of the Unicorn devices */
 {
-	/* thanks to Woodley Packard <sweaglesw@thibs.menloschool.org> */
+	/* thanks to Robert A. Lerche <ral 'at' msbit.com> */
 	USB_DEVICE(0x07fd, 0x0001),
 	.driver_info = (unsigned long) & (const snd_usb_audio_quirk_t) {
 		.vendor_name = "MOTU",
 		.product_name = "Fastlane",
+		.ifnum = QUIRK_ANY_INTERFACE,
+		.type = QUIRK_COMPOSITE,
+		.data = & (const snd_usb_audio_quirk_t[]) {
+			{
+				.ifnum = 0,
+				.type = QUIRK_MIDI_MOTU
+			},
+			{
 				.ifnum = 1,
-		.type = QUIRK_MIDI_FIXED_ENDPOINT,
-		.data = & (const snd_usb_midi_endpoint_info_t) {
-			.out_cables = 0x0003,
-			.in_cables  = 0x0003
+				.type = QUIRK_IGNORE_INTERFACE
+			},
+			{
+				.ifnum = -1
+			}
 		}
 	}
 },
@@ -1053,6 +1062,35 @@ YAMAHA_DEVICE(0x7010, "UB99"),
 	}
 },
 
+/* Novation EMS devices */
+{
+	USB_DEVICE_VENDOR_SPEC(0x1235, 0x0001),
+	.driver_info = (unsigned long) & (const snd_usb_audio_quirk_t) {
+		.vendor_name = "Novation",
+		.product_name = "ReMOTE Audio/XStation",
+		.ifnum = 4,
+		.type = QUIRK_MIDI_NOVATION
+	}
+},
+{
+	USB_DEVICE_VENDOR_SPEC(0x1235, 0x0002),
+	.driver_info = (unsigned long) & (const snd_usb_audio_quirk_t) {
+		.vendor_name = "Novation",
+		.product_name = "Speedio",
+		.ifnum = 3,
+		.type = QUIRK_MIDI_NOVATION
+	}
+},
+{
+	USB_DEVICE_VENDOR_SPEC(0x1235, 0x4661),
+	.driver_info = (unsigned long) & (const snd_usb_audio_quirk_t) {
+		.vendor_name = "Novation",
+		.product_name = "ReMOTE25",
+		.ifnum = 0,
+		.type = QUIRK_MIDI_NOVATION
+	}
+},
+
 {
 	/*
 	 * Some USB MIDI devices don't have an audio control interface,