1 files changed, 32 insertions, 0 deletions

diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index 4963defee18a..d01ec188b602 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -3327,6 +3327,32 @@ static int snd_usb_cm6206_boot_quirk(struct usb_device *dev)
 }
 
 /*
+ * 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
  */
 #define AUDIOPHILE_SET                  0x01 /* if set, parse device_setup */
@@ -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
          */