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

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>
hifive-unleashed-5.1
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;

11
sound/usb/quirks-table.h
View File

@ -39,6 +39,17 @@
.idProduct = prod, \
.bInterfaceClass = USB_CLASS_VENDOR_SPEC
/* FTDI devices */
{
USB_DEVICE(0x0403, 0xb8d8),
.driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
/* .vendor_name = "STARR LABS", */
/* .product_name = "Starr Labs MIDI USB device", */
.ifnum = 0,
.type = QUIRK_MIDI_FTDI
}
},
/* Creative/Toshiba Multimedia Center SB-0500 */
{
USB_DEVICE(0x041e, 0x3048),

1
sound/usb/quirks.c
View File

@ -306,6 +306,7 @@ int snd_usb_create_quirk(struct snd_usb_audio *chip,
[QUIRK_MIDI_EMAGIC] = create_any_midi_quirk,
[QUIRK_MIDI_CME] = create_any_midi_quirk,
[QUIRK_MIDI_AKAI] = create_any_midi_quirk,
[QUIRK_MIDI_FTDI] = create_any_midi_quirk,
[QUIRK_AUDIO_STANDARD_INTERFACE] = create_standard_audio_quirk,
[QUIRK_AUDIO_FIXED_ENDPOINT] = create_fixed_stream_quirk,
[QUIRK_AUDIO_EDIROL_UAXX] = create_uaxx_quirk,

1
sound/usb/usbaudio.h
View File

@ -80,6 +80,7 @@ enum quirk_type {
QUIRK_MIDI_CME,
QUIRK_MIDI_AKAI,
QUIRK_MIDI_US122L,
QUIRK_MIDI_FTDI,
QUIRK_AUDIO_STANDARD_INTERFACE,
QUIRK_AUDIO_FIXED_ENDPOINT,
QUIRK_AUDIO_EDIROL_UAXX,