From d39e82db73eb876c60d00f00219d767b3be30307 Mon Sep 17 00:00:00 2001 From: Sebastien Alaiwan Date: Tue, 16 Feb 2010 08:55:08 +0100 Subject: 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 Signed-off-by: Clemens Ladisch (cosmetics, list terminator) Signed-off-by: Jaroslav Kysela --- sound/usb/usbaudio.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) (limited to 'sound/usb/usbaudio.c') 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 @@ -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 */ -- cgit v1.2.3-58-ga151