ALSA: USB MIDI support for Access Music VirusTI

Here's a patch that adds MIDI support through USB for one of the Access
Music synths, the VirusTI.

The synth uses standard USBMIDI protocol on its USB interface 3, although
it does signal "vendor specific" class. A magic string has to be sent on
interface 3 to enable the sending of MIDI from the synth (this string was
found by sniffing usb communication of the Windows driver). This is all
my patch does, and it works on my computer.

Please note that the synth can also do standard usb audio I/O on its
interfaces 2&3, which already works with the current snd-usb-audio driver,
except for the audio input from the synth. I'm going to work on it when I
have some time.

Signed-off-by: Sebastien Alaiwan <sebastien.alaiwan@gmail.com>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de> (cosmetics, list terminator)
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index 4963defee18a210632ea8a8fd7c2b1e2d54f5476..d01ec188b602e188075f81f35513e99b3ee60209 100644 (file)
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -3326,6 +3326,32 @@ static int snd_usb_cm6206_boot_quirk(struct usb_device *dev)
        return err;
 }
 
+/*
+ * This call will put the synth in "USB send" mode, i.e it will send MIDI
+ * messages through USB (this is disabled at startup). The synth will
+ * acknowledge by sending a sysex on endpoint 0x85 and by displaying a USB
+ * sign on its LCD. Values here are chosen based on sniffing USB traffic
+ * under Windows.
+ */
+static int snd_usb_accessmusic_boot_quirk(struct usb_device *dev)
+{
+       int err, actual_length;
+
+       /* "midi send" enable */
+       static const u8 seq[] = { 0x4e, 0x73, 0x52, 0x01 };
+
+       void *buf = kmemdup(seq, ARRAY_SIZE(seq), GFP_KERNEL);
+       if (!buf)
+               return -ENOMEM;
+       err = usb_interrupt_msg(dev, usb_sndintpipe(dev, 0x05), buf,
+                       ARRAY_SIZE(seq), &actual_length, 1000);
+       kfree(buf);
+       if (err < 0)
+               return err;
+
+       return 0;
+}
+
 /*
  * Setup quirks
  */
@@ -3624,6 +3650,12 @@ static void *snd_usb_audio_probe(struct usb_device *dev,
                        goto __err_val;
        }
 
+       /* Access Music VirusTI Desktop */
+       if (id == USB_ID(0x133e, 0x0815)) {
+               if (snd_usb_accessmusic_boot_quirk(dev) < 0)
+                       goto __err_val;
+       }
+
        /*
         * found a config.  now register to ALSA
         */

diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c
index 6e89b8368d9ae2bcb315dd74fb28026cec25af99..8f5bc1e8dabccf38b5f33dd1dfe2aeadd554e330 100644 (file)
--- a/sound/usb/usbmidi.c
+++ b/sound/usb/usbmidi.c
@@ -1407,6 +1407,12 @@ static struct port_info {
        EXTERNAL_PORT(0x086a, 0x0001, 8, "%s Broadcast"),
        EXTERNAL_PORT(0x086a, 0x0002, 8, "%s Broadcast"),
        EXTERNAL_PORT(0x086a, 0x0003, 4, "%s Broadcast"),
+       /* Access Music Virus TI */
+       EXTERNAL_PORT(0x133e, 0x0815, 0, "%s MIDI"),
+       PORT_INFO(0x133e, 0x0815, 1, "%s Synth", 0,
+               SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
+               SNDRV_SEQ_PORT_TYPE_HARDWARE |
+               SNDRV_SEQ_PORT_TYPE_SYNTHESIZER),
 };
 
 static struct port_info *find_port_info(struct snd_usb_midi* umidi, int number)

diff --git a/sound/usb/usbquirks.h b/sound/usb/usbquirks.h
index a892bda03df9d12f83006851fe5d82be7bc82347..406b74b65ffbb8a3c1088302fbd91bf137561476 100644 (file)
--- a/sound/usb/usbquirks.h
+++ b/sound/usb/usbquirks.h
@@ -2073,6 +2073,33 @@ YAMAHA_DEVICE(0x7010, "UB99"),
        }
 },
 
+/* Access Music devices */
+{
+       /* VirusTI Desktop */
+       USB_DEVICE_VENDOR_SPEC(0x133e, 0x0815),
+       .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 = 3,
+                               .type = QUIRK_MIDI_FIXED_ENDPOINT,
+                               .data = &(const struct snd_usb_midi_endpoint_info) {
+                                       .out_cables = 0x0003,
+                                       .in_cables  = 0x0003
+                               }
+                       },
+                       {
+                               .ifnum = 4,
+                               .type = QUIRK_IGNORE_INTERFACE
+                       },
+                       {
+                               .ifnum = -1
+                       }
+               }
+       }
+},
+
 /* */
 {
        /* aka. Serato Scratch Live DJ Box */