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SubjectRe: [PATCH][ALSA] usbmidi support for Access Music synths.
Hello,

Thanks for your advice!

Clemens Ladisch wrote:
> For only one interface, you don't need to use QUIRK_COMPOSITE; see the
> entry for the UM-880.

I've replaced the QUIRK_COMPOSITE by a QUIRK_MIDI_FIXED_ENDPOINT, the module also probes (and fails) the USB interface 4 (I don't know what this interface is for on this device) which results in the printing of an error in the kernel log. How can I inform the snd-usb-audio driver that the USB interface 4 should be left alone?

Please find an updated (and shrinked!) patch below.

Signed-off-by: Sebastien Alaiwan <sebastien.alaiwan@gmail.com>
---
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index 9edef46..aaf8f7c 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -3327,6 +3327,31 @@ 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 aknowledge
+ * 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 +3649,12 @@ 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 6e89b83..8f5bc1e 100644
--- 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 a892bda..853788d 100644
--- a/sound/usb/usbquirks.h
+++ b/sound/usb/usbquirks.h
@@ -2073,6 +2073,20 @@ 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 = 3,
+ .type = QUIRK_MIDI_FIXED_ENDPOINT,
+ .data = &(const struct snd_usb_midi_endpoint_info) {
+ .out_cables = 0x0003,
+ .in_cables = 0x0003
+ }
+ }
+},
+
/* */
{
/* aka. Serato Scratch Live DJ Box */


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