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Commit 1ef0e0a0 authored by Kristian Amlie's avatar Kristian Amlie Committed by Takashi Iwai
Browse files

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: default avatarKristian Amlie <kristian@amlie.name>
Acked-by: default avatarDaniel Mack <zonque@gmail.com>
Signed-off-by: default avatarClemens Ladisch <clemens@ladisch.de>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 391e6914

sound/usb/midi.c

+27 −0
Original line number Diff line number Diff line
@@ -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;

sound/usb/quirks-table.h

+11 −0
Original line number Diff line number Diff line
@@ -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),

sound/usb/quirks.c

+1 −0
Original line number Diff line number Diff line
@@ -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,

sound/usb/usbaudio.h

+1 −0
Original line number Diff line number Diff line
@@ -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,