Staging: add line6 usb driver

This is an experimental Linux driver for the guitar amp, cab, and
effects modeller PODxt Pro by Line6 (and similar devices), supporting
the following features:

  - Reading/writing individual parameters
  - Reading/writing complete channel, effects setup, and amp setup data
  - Channel switching
  - Virtual MIDI interface
  - Tuner access
  - Playback/capture/mixer device for any  ALSA-compatible PCM audio
    application
  - Signal routing (record clean/processed  guitar signal, re-amping)

Moreover, preliminary support for the Variax Workbench is included.

From: Markus Grabner <grabner@icg.tugraz.at>
Cc: Mariusz Kozlowski <m.kozlowski@tuxland.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 87 insertions, 0 deletions

diff --git a/drivers/staging/line6/midi.h b/drivers/staging/line6/midi.h
new file mode 100644
index 00000000000..be05a54205c
--- /dev/null
+++ b/drivers/staging/line6/midi.h
@@ -0,0 +1,87 @@
+/*
+ * Line6 Linux USB driver - 0.8.0
+ *
+ * Copyright (C) 2004-2009 Markus Grabner (grabner@icg.tugraz.at)
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License as
+ *	published by the Free Software Foundation, version 2.
+ *
+ */
+
+#ifndef MIDI_H
+#define MIDI_H
+
+
+#include <sound/rawmidi.h>
+
+#include "midibuf.h"
+
+
+#define MIDI_BUFFER_SIZE 1024
+
+
+struct snd_line6_midi
+{
+	/**
+		 Pointer back to the Line6 driver data structure.
+	*/
+	struct usb_line6 *line6;
+
+	/**
+		 MIDI substream for receiving (or NULL if not active).
+	*/
+	struct snd_rawmidi_substream *substream_receive;
+
+	/**
+		 MIDI substream for transmitting (or NULL if not active).
+	*/
+	struct snd_rawmidi_substream *substream_transmit;
+
+	/**
+		 Number of currently active MIDI send URBs.
+	*/
+	int num_active_send_urbs;
+
+	/**
+		 Spin lock to protect updates of send_urb.
+	*/
+	spinlock_t send_urb_lock;
+
+	/**
+		 Spin lock to protect MIDI buffer handling.
+	*/
+	spinlock_t midi_transmit_lock;
+
+	/**
+		 Wait queue for MIDI transmission.
+	*/
+	wait_queue_head_t send_wait;
+
+	/**
+		 Bit mask for output MIDI channels.
+	*/
+	int midi_mask_transmit;
+
+	/**
+		 Bit mask for input MIDI channels.
+	*/
+	int midi_mask_receive;
+
+	/**
+		 Buffer for incoming MIDI stream.
+	*/
+	struct MidiBuffer midibuf_in;
+
+	/**
+		 Buffer for outgoing MIDI stream.
+	*/
+	struct MidiBuffer midibuf_out;
+};
+
+
+extern int line6_init_midi(struct usb_line6 *line6);
+extern void line6_midi_receive(struct usb_line6 *line6, unsigned char *data, int length);
+
+
+#endif