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ALSA: usb-audio: add Starr Labs USB MIDI support

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Add support for Starr Labs USB MIDI devices such as the Z7S, which are
based on an FTDI serial UART chip.

Based on a patch by Daniel Mack.

Signed-off-by: Kristian Amlie <kristian@amlie.name>
Acked-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Kristian Amlie
2011-08-26 13:19:49 +02:00
committed by Takashi Iwai
parent 391e69143d
commit 1ef0e0a053
4 changed files with 40 additions and 0 deletions
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27
sound/usb/midi.c
View File

@@ -816,6 +816,22 @@ static struct usb_protocol_ops snd_usbmidi_raw_ops = {
.output = snd_usbmidi_raw_output,
};
/*
* FTDI protocol: raw MIDI bytes, but input packets have two modem status bytes.
*/
static void snd_usbmidi_ftdi_input(struct snd_usb_midi_in_endpoint* ep,
uint8_t* buffer, int buffer_length)
{
if (buffer_length > 2)
snd_usbmidi_input_data(ep, 0, buffer + 2, buffer_length - 2);
}
static struct usb_protocol_ops snd_usbmidi_ftdi_ops = {
.input = snd_usbmidi_ftdi_input,
.output = snd_usbmidi_raw_output,
};
static void snd_usbmidi_us122l_input(struct snd_usb_midi_in_endpoint *ep,
uint8_t *buffer, int buffer_length)
{
@@ -2163,6 +2179,17 @@ int snd_usbmidi_create(struct snd_card *card,
/* endpoint 1 is input-only */
endpoints[1].out_cables = 0;
break;
case QUIRK_MIDI_FTDI:
umidi->usb_protocol_ops = &snd_usbmidi_ftdi_ops;
/* set baud rate to 31250 (48 MHz / 16 / 96) */
err = usb_control_msg(umidi->dev, usb_sndctrlpipe(umidi->dev, 0),
3, 0x40, 0x60, 0, NULL, 0, 1000);
if (err < 0)
break;
err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
break;
default:
snd_printd(KERN_ERR "invalid quirk type %d\n", quirk->type);
err = -ENXIO;