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, 69 insertions, 0 deletions

diff --git a/drivers/staging/line6/audio.c b/drivers/staging/line6/audio.c
new file mode 100644
index 00000000000..e15fa1f6ee4
--- /dev/null
+++ b/drivers/staging/line6/audio.c
@@ -0,0 +1,69 @@
+/*
+ * 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.
+ *
+ */
+
+#include "driver.h"
+
+#include <sound/core.h>
+#include <sound/initval.h>
+
+
+static int line6_index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
+static char *line6_id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
+
+
+/*
+	Initialize the Line6 USB audio system.
+*/
+int line6_init_audio(struct usb_line6 *line6)
+{
+	static int dev = 0;
+	struct snd_card *card;
+
+	card = snd_card_new(line6_index[dev], line6_id[dev], THIS_MODULE, 0);
+
+	if(card == NULL)
+		return -ENOMEM;
+
+	line6->card = card;
+
+	strcpy(card->driver, DRIVER_NAME);
+	strcpy(card->shortname, "Line6-USB");
+	sprintf(card->longname, "Line6 %s at USB %s", line6->properties->name, line6->ifcdev->bus_id);  /* 80 chars - see asound.h */
+	return 0;
+}
+
+/*
+	Register the Line6 USB audio system.
+*/
+int line6_register_audio(struct usb_line6 *line6)
+{
+	int err;
+
+	if((err = snd_card_register(line6->card)) < 0)
+		return err;
+
+	return 0;
+}
+
+/*
+	Cleanup the Line6 USB audio system.
+*/
+void line6_cleanup_audio(struct usb_line6 *line6)
+{
+	struct snd_card *card = line6->card;
+
+	if(card == 0)
+		return;
+
+	snd_card_disconnect(card);
+	snd_card_free(card);
+	line6->card = 0;
+}