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: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/line6/Kconfig

+config LINE6_USB
+	tristate "Line6 USB support"
+	depends on USB
+	help
+	  This is a 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)
+
+	  Preliminary support for the Variax Workbench is included.
+

drivers/staging/line6/Makefile

+obj-$(CONFIG_LINE6_USB)		+= line6usb.o
+
+line6usb-objs := 		\
+		audio.o		\
+		capture.o	\
+		control.o	\
+		driver.o	\
+		dumprequest.o	\
+		midi.o		\
+		midibuf.o	\
+		pcm.o		\
+		playback.o	\
+		pod.o		\
+		toneport.o	\
+		variax.o

drivers/staging/line6/audio.c

+/*
+ * 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;
+}

drivers/staging/line6/audio.h

+/*
+ * 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 AUDIO_H
+#define AUDIO_H
+
+
+#include "driver.h"
+
+
+extern void line6_cleanup_audio(struct usb_line6 *);
+extern int line6_init_audio(struct usb_line6 *);
+extern int line6_register_audio(struct usb_line6 *);
+
+
+#endif

drivers/staging/line6/capture.c

+/*
+ * 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/pcm.h>
+#include <sound/pcm_params.h>
+
+#include "audio.h"
+#include "pcm.h"
+#include "pod.h"
+
+
+/*
+	Find a free URB and submit it.
+*/
+static int submit_audio_in_urb(struct snd_pcm_substream *substream)
+{
+	int index;
+	unsigned long flags;
+	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+	int i, urb_size;
+	struct urb *urb_in;
+
+	spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
+	index = find_first_zero_bit(&line6pcm->active_urb_in, LINE6_ISO_BUFFERS);
+
+	if(index < 0 || index >= LINE6_ISO_BUFFERS) {
+		spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
+		dev_err(s2m(substream), "no free URB found\n");
+		return -EINVAL;
+	}
+
+	urb_in = line6pcm->urb_audio_in[index];
+	urb_size = 0;
+
+	for(i = 0; i < LINE6_ISO_PACKETS; ++i) {
+		struct usb_iso_packet_descriptor *fin = &urb_in->iso_frame_desc[i];
+		fin->offset = urb_size;
+		fin->length = line6pcm->max_packet_size;
+		urb_size += line6pcm->max_packet_size;
+	}
+
+	urb_in->transfer_buffer = line6pcm->buffer_in + index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
+	urb_in->transfer_buffer_length = urb_size;
+	urb_in->context = substream;
+
+	if(usb_submit_urb(urb_in, GFP_ATOMIC) == 0)
+		set_bit(index, &line6pcm->active_urb_in);
+	else
+		dev_err(s2m(substream), "URB in #%d submission failed\n", index);
+
+	spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
+	return 0;
+}
+
+/*
+	Submit all currently available capture URBs.
+*/
+static int submit_audio_in_all_urbs(struct snd_pcm_substream *substream)
+{
+	int ret, i;
+
+	for(i = 0; i < LINE6_ISO_BUFFERS; ++i)
+		if((ret = submit_audio_in_urb(substream)) < 0)
+			return ret;
+
+	return 0;
+}
+
+/*
+	Unlink all currently active capture URBs.
+*/
+static void unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm)
+{
+	unsigned int i;
+
+	for(i = LINE6_ISO_BUFFERS; i--;) {
+		if(test_bit(i, &line6pcm->active_urb_in)) {
+			if(!test_and_set_bit(i, &line6pcm->unlink_urb_in)) {
+				struct urb *u = line6pcm->urb_audio_in[i];
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 14)
+				u->transfer_flags |= URB_ASYNC_UNLINK;
+#endif
+				usb_unlink_urb(u);
+			}
+		}
+	}
+}
+
+/*
+	Wait until unlinking of all currently active capture URBs has been finished.
+*/
+static void wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
+{
+	int timeout = HZ;
+	unsigned int i;
+	int alive;
+
+	do {
+		alive = 0;
+		for (i = LINE6_ISO_BUFFERS; i--;) {
+			if (test_bit(i, &line6pcm->active_urb_in))
+				alive++;
+		}
+		if (! alive)
+			break;
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		schedule_timeout(1);
+	} while (--timeout > 0);
+	if (alive)
+		snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
+
+	line6pcm->active_urb_in = 0;
+	line6pcm->unlink_urb_in = 0;
+}
+
+/*
+	Unlink all currently active capture URBs, and wait for finishing.
+*/
+void unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
+{
+	unlink_audio_in_urbs(line6pcm);
+	wait_clear_audio_in_urbs(line6pcm);
+}
+
+/*
+	Callback for completed capture URB.
+*/
+static void audio_in_callback(struct urb *urb PT_REGS)
+{
+	int i, index, length = 0, shutdown = 0;
+	int frames;
+	unsigned long flags;
+
+	struct snd_pcm_substream *substream = (struct snd_pcm_substream *)urb->context;
+	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+	const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	/* find index of URB */
+	for(index = 0; index < LINE6_ISO_BUFFERS; ++index)
+		if(urb == line6pcm->urb_audio_in[index])
+			break;
+
+#if DO_DUMP_PCM_RECEIVE
+	for(i = 0; i < LINE6_ISO_PACKETS; ++i) {
+		struct usb_iso_packet_descriptor *fout = &urb->iso_frame_desc[i];
+		line6_write_hexdump(line6pcm->line6, 'C', urb->transfer_buffer + fout->offset, fout->length);
+	}
+#endif
+
+	spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
+
+	for(i = 0; i < LINE6_ISO_PACKETS; ++i) {
+		char *fbuf;
+		int fsize;
+		struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
+
+		if(fin->status == -18) {
+			shutdown = 1;
+			break;
+		}
+
+		fbuf = urb->transfer_buffer + fin->offset;
+		fsize = fin->actual_length;
+		length += fsize;
+
+		if(fsize > 0) {
+			frames = fsize / bytes_per_frame;
+
+			if(line6pcm->pos_in_done + frames > runtime->buffer_size) {
+				/*
+					The transferred area goes over buffer boundary,
+					copy two separate chunks.
+				*/
+				int len;
+				len = runtime->buffer_size - line6pcm->pos_in_done;
+
+				if(len > 0) {
+					memcpy(runtime->dma_area + line6pcm->pos_in_done * bytes_per_frame, fbuf, len * bytes_per_frame);
+					memcpy(runtime->dma_area, fbuf + len * bytes_per_frame, (frames - len) * bytes_per_frame);
+				}
+				else
+					dev_err(s2m(substream), "driver bug: len = %d\n", len);  /* this is somewhat paranoid */
+			}
+			else {
+				/* copy single chunk */
+				memcpy(runtime->dma_area + line6pcm->pos_in_done * bytes_per_frame, fbuf, fsize * bytes_per_frame);
+			}
+
+			if((line6pcm->pos_in_done += frames) >= runtime->buffer_size)
+				line6pcm->pos_in_done -= runtime->buffer_size;
+		}
+	}
+
+	clear_bit(index, &line6pcm->active_urb_in);
+
+	if(test_bit(index, &line6pcm->unlink_urb_in))
+		shutdown = 1;
+
+	spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
+
+	if(!shutdown) {
+		submit_audio_in_urb(substream);
+
+		if((line6pcm->bytes_in += length) >= line6pcm->period_in) {
+			line6pcm->bytes_in -= line6pcm->period_in;
+			snd_pcm_period_elapsed(substream);
+		}
+	}
+}
+
+/* open capture callback */
+static int snd_line6_capture_open(struct snd_pcm_substream *substream)
+{
+	int err;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+
+	if((err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+																					(&line6pcm->properties->snd_line6_rates))) < 0)
+		return err;
+
+	runtime->hw = line6pcm->properties->snd_line6_capture_hw;
+	return 0;
+}
+
+/* close capture callback */
+static int snd_line6_capture_close(struct snd_pcm_substream *substream)
+{
+	return 0;
+}
+
+/* hw_params capture callback */
+static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params)
+{
+	int ret;
+	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+
+	/* -- Florian Demski [FD] */
+	/* don't ask me why, but this fixes the bug on my machine */
+	if ( line6pcm == NULL ) {
+		if ( substream->pcm == NULL )
+			return -ENOMEM;
+		if ( substream->pcm->private_data == NULL )
+			return -ENOMEM;
+		substream->private_data = substream->pcm->private_data;
+		line6pcm = snd_pcm_substream_chip( substream );
+	}
+	/* -- [FD] end */
+
+	if((ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
+		return ret;
+
+	line6pcm->period_in = params_period_bytes(hw_params);
+	line6pcm->buffer_in = kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS * LINE6_ISO_PACKET_SIZE_MAX, GFP_KERNEL);
+
+	if(!line6pcm->buffer_in) {
+		dev_err(s2m(substream), "cannot malloc buffer_in\n");
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+/* hw_free capture callback */
+static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
+{
+	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+	unlink_wait_clear_audio_in_urbs(line6pcm);
+
+	if(line6pcm->buffer_in) {
+		kfree(line6pcm->buffer_in);
+		line6pcm->buffer_in = 0;
+	}
+
+	return snd_pcm_lib_free_pages(substream);
+}
+
+/* trigger callback */
+int snd_line6_capture_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+	int err;
+	line6pcm->count_in = 0;
+
+	switch(cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		if(!test_and_set_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags)) {
+			err = submit_audio_in_all_urbs(substream);
+
+			if(err < 0) {
+				clear_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags);
+				return err;
+			}
+		}
+
+		break;
+
+	case SNDRV_PCM_TRIGGER_STOP:
+		if(test_and_clear_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags))
+			unlink_audio_in_urbs(line6pcm);
+
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/* capture pointer callback */
+static snd_pcm_uframes_t
+snd_line6_capture_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+	return line6pcm->pos_in_done;
+}
+
+/* capture operators */
+struct snd_pcm_ops snd_line6_capture_ops = {
+	.open =        snd_line6_capture_open,
+	.close =       snd_line6_capture_close,
+	.ioctl =       snd_pcm_lib_ioctl,
+	.hw_params =   snd_line6_capture_hw_params,
+	.hw_free =     snd_line6_capture_hw_free,
+	.prepare =     snd_line6_prepare,
+	.trigger =     snd_line6_trigger,
+	.pointer =     snd_line6_capture_pointer,
+};
+
+int create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
+{
+	int i;
+
+	/* create audio URBs and fill in constant values: */
+	for(i = 0; i < LINE6_ISO_BUFFERS; ++i) {
+		struct urb *urb;
+
+		/* URB for audio in: */
+		urb = line6pcm->urb_audio_in[i] = usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
+
+		if(urb == NULL) {
+			dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
+			return -ENOMEM;
+		}
+
+		urb->dev = line6pcm->line6->usbdev;
+		urb->pipe = usb_rcvisocpipe(line6pcm->line6->usbdev, line6pcm->ep_audio_read & USB_ENDPOINT_NUMBER_MASK);
+		urb->transfer_flags = URB_ISO_ASAP;
+		urb->start_frame = -1;
+		urb->number_of_packets = LINE6_ISO_PACKETS;
+		urb->interval = LINE6_ISO_INTERVAL;
+		urb->error_count = 0;
+		urb->complete = audio_in_callback;
+	}
+
+	return 0;
+}

drivers/staging/line6/capture.h

+/*
+ * 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 CAPTURE_H
+#define CAPTURE_H
+
+
+#include "driver.h"
+
+#include <sound/pcm.h>
+
+#include "pcm.h"
+
+
+extern struct snd_pcm_ops snd_line6_capture_ops;
+
+
+extern int create_audio_in_urbs(struct snd_line6_pcm *line6pcm);
+extern int snd_line6_capture_trigger(struct snd_pcm_substream *substream, int cmd);
+extern void unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm);
+
+
+#endif

drivers/staging/line6/config.h

+/*
+ * 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 CONFIG_H
+#define CONFIG_H
+
+
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)
+#include <linux/config.h>
+#endif
+
+#ifdef CONFIG_USB_DEBUG
+#define DEBUG 1
+#endif
+
+
+/**
+   Development tools.
+*/
+#define DO_DEBUG_MESSAGES    0
+#define DO_DUMP_URB_SEND     DO_DEBUG_MESSAGES
+#define DO_DUMP_URB_RECEIVE  DO_DEBUG_MESSAGES
+#define DO_DUMP_PCM_SEND     0
+#define DO_DUMP_PCM_RECEIVE  0
+#define DO_DUMP_MIDI_SEND    DO_DEBUG_MESSAGES
+#define DO_DUMP_MIDI_RECEIVE DO_DEBUG_MESSAGES
+#define DO_DUMP_ANY          (DO_DUMP_URB_SEND || DO_DUMP_URB_RECEIVE || \
+			      DO_DUMP_PCM_SEND || DO_DUMP_PCM_RECEIVE || \
+			      DO_DUMP_MIDI_SEND || DO_DUMP_MIDI_RECEIVE)
+#define CREATE_RAW_FILE      0
+
+#if DO_DEBUG_MESSAGES
+#define CHECKPOINT printk("line6usb: %s (%s:%d)\n", __FUNCTION__, __FILE__, __LINE__)
+#endif
+
+/**
+   In Linux 2.6.13 and later, the device_attribute is passed to the sysfs
+   get/set functions (see /usr/src/linux/include/linux/device.h).
+*/
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 13)
+#define DEVICE_ATTRIBUTE struct device_attribute *attr,
+#else
+#define DEVICE_ATTRIBUTE
+#endif
+
+/**
+   In Linux 2.6.20 and later, the pt_regs is no longer passed to USB callback
+   functions.
+*/
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
+#define PT_REGS
+#else
+#define PT_REGS , struct pt_regs *regs
+#endif
+
+#if DO_DEBUG_MESSAGES
+#define DEBUG_MESSAGES(x) (x)
+#else
+#define DEBUG_MESSAGES(x)
+#endif
+
+
+#endif

drivers/staging/line6/control.h

+/*
+ * 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 LINE6_CONTROL_H
+#define LINE6_CONTROL_H
+
+
+/**
+   List of PODxt Pro controls.
+   See Appendix C of the "PODxt (Pro) Pilot's Handbook" by Line6.
+   Comments after the number refer to the PODxt Pro firmware version required
+   for this feature.
+*/
+enum {
+	POD_tweak                          =   1,
+	POD_wah_position                   =   4,
+	POD_compression_gain               =   5,  /* device: LINE6_BITS_PODXTALL */
+	POD_vol_pedal_position             =   7,
+	POD_compression_threshold          =   9,
+	POD_pan                            =  10,
+	POD_amp_model_setup                =  11,
+	POD_amp_model                      =  12,  /* firmware: 2.0 */
+	POD_drive                          =  13,
+	POD_bass                           =  14,
+	POD_mid                            =  15,  /* device: LINE6_BITS_PODXTALL */
+	POD_lowmid                         =  15,  /* device: LINE6_BITS_BASSPODXTALL */
+	POD_treble                         =  16,  /* device: LINE6_BITS_PODXTALL */
+	POD_highmid                        =  16,  /* device: LINE6_BITS_BASSPODXTALL */
+	POD_chan_vol                       =  17,
+	POD_reverb_mix                     =  18,  /* device: LINE6_BITS_PODXTALL */
+	POD_effect_setup                   =  19,
+	POD_band_1_frequency               =  20,  /* firmware: 2.0 */
+	POD_presence                       =  21,  /* device: LINE6_BITS_PODXTALL */
+	POD_treble__bass                   =  21,  /* device: LINE6_BITS_BASSPODXTALL */
+	POD_noise_gate_enable              =  22,
+	POD_gate_threshold                 =  23,
+	POD_gate_decay_time                =  24,
+	POD_stomp_enable                   =  25,
+	POD_comp_enable                    =  26,
+	POD_stomp_time                     =  27,
+	POD_delay_enable                   =  28,
+	POD_mod_param_1                    =  29,
+	POD_delay_param_1                  =  30,
+	POD_delay_param_1_note_value       =  31,
+	POD_band_2_frequency__bass         =  32,  /* device: LINE6_BITS_BASSPODXTALL */ /* firmware: 2.0 */
+	POD_delay_param_2                  =  33,
+	POD_delay_volume_mix               =  34,
+	POD_delay_param_3                  =  35,
+	POD_reverb_enable                  =  36,  /* device: LINE6_BITS_PODXTALL */
+	POD_reverb_type                    =  37,  /* device: LINE6_BITS_PODXTALL */
+	POD_reverb_decay                   =  38,  /* device: LINE6_BITS_PODXTALL */
+	POD_reverb_tone                    =  39,  /* device: LINE6_BITS_PODXTALL */
+	POD_reverb_pre_delay               =  40,  /* device: LINE6_BITS_PODXTALL */
+	POD_reverb_pre_post                =  41,  /* device: LINE6_BITS_PODXTALL */
+	POD_band_2_frequency               =  42,  /* device: LINE6_BITS_PODXTALL */     /* firmware: 2.0 */
+	POD_band_3_frequency__bass         =  42,  /* device: LINE6_BITS_BASSPODXTALL */ /* firmware: 2.0 */
+	POD_wah_enable                     =  43,
+	POD_modulation_lo_cut              =  44,  /* device: LINE6_BITS_BASSPODXTALL */
+	POD_delay_reverb_lo_cut            =  45,  /* device: LINE6_BITS_BASSPODXTALL */
+	POD_volume_pedal_minimum           =  46,  /* device: LINE6_BITS_PODXTALL */     /* firmware: 2.0 */
+	POD_eq_pre_post                    =  46,  /* device: LINE6_BITS_BASSPODXTALL */ /* firmware: 2.0 */
+	POD_volume_pre_post                =  47,
+	POD_di_model                       =  48,  /* device: LINE6_BITS_BASSPODXTALL */
+	POD_di_delay                       =  49,  /* device: LINE6_BITS_BASSPODXTALL */
+	POD_mod_enable                     =  50,
+	POD_mod_param_1_note_value         =  51,
+	POD_mod_param_2                    =  52,
+	POD_mod_param_3                    =  53,
+	POD_mod_param_4                    =  54,
+	POD_mod_param_5                    =  55,  /* device: LINE6_BITS_BASSPODXTALL */
+	POD_mod_volume_mix                 =  56,
+	POD_mod_pre_post                   =  57,
+	POD_modulation_model               =  58,
+	POD_band_3_frequency               =  60,  /* device: LINE6_BITS_PODXTALL */     /* firmware: 2.0 */
+	POD_band_4_frequency__bass         =  60,  /* device: LINE6_BITS_BASSPODXTALL */ /* firmware: 2.0 */
+	POD_mod_param_1_double_precision   =  61,
+	POD_delay_param_1_double_precision =  62,
+	POD_eq_enable                      =  63,  /* firmware: 2.0 */
+	POD_tap                            =  64,
+	POD_volume_tweak_pedal_assign      =  65,
+	POD_band_5_frequency               =  68,  /* device: LINE6_BITS_BASSPODXTALL */ /* firmware: 2.0 */
+	POD_tuner                          =  69,
+	POD_mic_selection                  =  70,
+	POD_cabinet_model                  =  71,
+	POD_stomp_model                    =  75,
+	POD_roomlevel                      =  76,
+	POD_band_4_frequency               =  77,  /* device: LINE6_BITS_PODXTALL */     /* firmware: 2.0 */
+	POD_band_6_frequency               =  77,  /* device: LINE6_BITS_BASSPODXTALL */ /* firmware: 2.0 */
+	POD_stomp_param_1_note_value       =  78,
+	POD_stomp_param_2                  =  79,
+	POD_stomp_param_3                  =  80,
+	POD_stomp_param_4                  =  81,
+	POD_stomp_param_5                  =  82,
+	POD_stomp_param_6                  =  83,
+	POD_amp_switch_select              =  84,  /* device: LINE6_BITS_LIVE */
+	POD_delay_param_4                  =  85,
+	POD_delay_param_5                  =  86,
+	POD_delay_pre_post                 =  87,
+	POD_delay_model                    =  88,  /* device: LINE6_BITS_PODXTALL */
+	POD_delay_verb_model               =  88,  /* device: LINE6_BITS_BASSPODXTALL */
+	POD_tempo_msb                      =  89,
+	POD_tempo_lsb                      =  90,
+	POD_wah_model                      =  91,  /* firmware: 3.0 */
+	POD_bypass_volume                  = 105,  /* firmware: 2.14 */
+	POD_fx_loop_on_off                 = 107,  /* device: LINE6_BITS_PRO */
+	POD_tweak_param_select             = 108,
+	POD_amp1_engage                    = 111,
+	POD_band_1_gain                    = 114,  /* firmware: 2.0 */
+	POD_band_2_gain__bass              = 115,  /* device: LINE6_BITS_BASSPODXTALL */ /* firmware: 2.0 */
+	POD_band_2_gain                    = 116,  /* device: LINE6_BITS_PODXTALL */     /* firmware: 2.0 */
+	POD_band_3_gain__bass              = 116,  /* device: LINE6_BITS_BASSPODXTALL */ /* firmware: 2.0 */
+	POD_band_3_gain                    = 117,  /* device: LINE6_BITS_PODXTALL */     /* firmware: 2.0 */
+	POD_band_4_gain__bass              = 117,  /* device: LINE6_BITS_BASSPODXTALL */ /* firmware: 2.0 */
+	POD_band_5_gain__bass              = 118,  /* device: LINE6_BITS_BASSPODXTALL */ /* firmware: 2.0 */
+	POD_band_4_gain                    = 119,  /* device: LINE6_BITS_PODXTALL */     /* firmware: 2.0 */
+	POD_band_6_gain__bass              = 119   /* device: LINE6_BITS_BASSPODXTALL */ /* firmware: 2.0 */
+};
+
+/**
+   List of Variax workbench controls (dump).
+*/
+enum {
+	VARIAX_body                        =   3,
+	VARIAX_pickup1_enable              =   4,  /* 0: enabled, 1: disabled */
+	VARIAX_pickup1_type                =   8,
+	VARIAX_pickup1_position            =   9,  /* type: 24 bit float */
+	VARIAX_pickup1_angle               =  12,  /* type: 24 bit float */
+	VARIAX_pickup1_level               =  15,  /* type: 24 bit float */
+	VARIAX_pickup2_enable              =  18,  /* 0: enabled, 1: disabled */
+	VARIAX_pickup2_type                =  22,
+	VARIAX_pickup2_position            =  23,  /* type: 24 bit float */
+	VARIAX_pickup2_angle               =  26,  /* type: 24 bit float */
+	VARIAX_pickup2_level               =  29,  /* type: 24 bit float */
+	VARIAX_pickup_phase                =  32,  /* 0: in phase, 1: out of phase */
+	VARIAX_capacitance                 =  33,  /* type: 24 bit float */
+	VARIAX_tone_resistance             =  36,  /* type: 24 bit float */
+	VARIAX_volume_resistance           =  39,  /* type: 24 bit float */
+	VARIAX_taper                       =  42,  /* 0: Linear, 1: Audio */
+	VARIAX_tone_dump                   =  43,  /* type: 24 bit float */
+	VARIAX_save_tone                   =  46,
+	VARIAX_volume_dump                 =  47,  /* type: 24 bit float */
+	VARIAX_tuning_enable               =  50,
+	VARIAX_tuning6                     =  51,
+	VARIAX_tuning5                     =  52,
+	VARIAX_tuning4                     =  53,
+	VARIAX_tuning3                     =  54,
+	VARIAX_tuning2                     =  55,
+	VARIAX_tuning1                     =  56,
+	VARIAX_detune6                     =  57,  /* type: 24 bit float */
+	VARIAX_detune5                     =  60,  /* type: 24 bit float */
+	VARIAX_detune4                     =  63,  /* type: 24 bit float */
+	VARIAX_detune3                     =  66,  /* type: 24 bit float */
+	VARIAX_detune2                     =  69,  /* type: 24 bit float */
+	VARIAX_detune1                     =  72,  /* type: 24 bit float */
+	VARIAX_mix6                        =  75,  /* type: 24 bit float */
+	VARIAX_mix5                        =  78,  /* type: 24 bit float */
+	VARIAX_mix4                        =  81,  /* type: 24 bit float */
+	VARIAX_mix3                        =  84,  /* type: 24 bit float */
+	VARIAX_mix2                        =  87,  /* type: 24 bit float */
+	VARIAX_mix1                        =  90,  /* type: 24 bit float */
+	VARIAX_pickup_wiring               =  96   /* 0: parallel, 1: series */
+};
+
+/**
+   List of Variax workbench controls (MIDI).
+*/
+enum {
+	VARIAXMIDI_volume                  =   7,
+	VARIAXMIDI_tone                    =  79,
+};
+
+
+extern int pod_create_files(int firmware, int type, struct device *dev);
+extern void pod_remove_files(int firmware, int type, struct device *dev);
+extern int variax_create_files(int firmware, int type, struct device *dev);
+extern void variax_remove_files(int firmware, int type, struct device *dev);
+
+
+#endif

drivers/staging/line6/driver.h

+/*
+ * 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 DRIVER_H
+#define DRIVER_H
+
+
+#include "config.h"
+
+#include <linux/spinlock.h>
+#include <linux/usb.h>
+#include <linux/wait.h>
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25)
+#include <sound/driver.h>
+#endif
+
+#include <sound/core.h>
+
+#include "midi.h"
+
+
+#define DRIVER_NAME "line6usb"
+
+#define LINE6_TIMEOUT 1
+#define LINE6_MAX_DEVICES 8
+#define LINE6_BUFSIZE_LISTEN 32
+#define LINE6_MESSAGE_MAXLEN 256
+
+
+/*
+	Line6 MIDI control commands
+*/
+#define LINE6_PARAM_CHANGE   0xb0
+#define LINE6_PROGRAM_CHANGE 0xc0
+#define LINE6_SYSEX_BEGIN    0xf0
+#define LINE6_SYSEX_END      0xf7
+#define LINE6_RESET          0xff
+
+/*
+	MIDI channel for messages initiated by the host
+	(and eventually echoed back by the device)
+*/
+#define LINE6_CHANNEL_HOST   0x00
+
+/*
+	MIDI channel for messages initiated by the device
+*/
+#define LINE6_CHANNEL_DEVICE 0x02
+
+#define LINE6_CHANNEL_UNKNOWN 5  /* don't know yet what this is good for */
+
+#define LINE6_CHANNEL_MASK 0x0f
+
+
+#define MISSING_CASE printk("line6usb driver bug: missing case in %s:%d\n", __FILE__, __LINE__)
+
+
+#define CHECK_RETURN(x) if((err = x) < 0) return err
+
+
+extern const unsigned char line6_midi_id[3];
+extern struct usb_line6 *line6_devices[LINE6_MAX_DEVICES];
+extern struct workqueue_struct *line6_workqueue;
+
+static const int SYSEX_DATA_OFS = sizeof(line6_midi_id) + 3;
+static const int SYSEX_EXTRA_SIZE = sizeof(line6_midi_id) + 4;
+
+
+/**
+	 Common properties of Line6 devices.
+*/
+struct line6_properties {
+	const char *name;
+	int device_bit;
+	int capabilities;
+};
+
+/**
+	 Common data shared by all Line6 devices.
+	 Corresponds to a pair of USB endpoints.
+*/
+struct usb_line6 {
+	/**
+		 USB device.
+	*/
+	struct usb_device *usbdev;
+
+	/**
+		 Product id.
+	*/
+	int product;
+
+	/**
+		 Properties.
+	*/
+	const struct line6_properties *properties;
+
+	/**
+		 Interface number.
+	*/
+	int interface_number;
+
+	/**
+		 Interval (ms).
+	*/
+	int interval;
+
+	/**
+		 Maximum size of USB packet.
+	*/
+	int max_packet_size;
+
+	/**
+		 Device representing the USB interface.
+	*/
+	struct device *ifcdev;
+
+	/**
+		 Line6 sound card data structure.
+		 Each device has at least MIDI or PCM.
+	*/
+	struct snd_card *card;
+
+	/**
+		 Line6 PCM device data structure.
+	*/
+	struct snd_line6_pcm *line6pcm;
+
+	/**
+		 Line6 MIDI device data structure.
+	*/
+	struct snd_line6_midi *line6midi;
+
+	/**
+		 USB endpoint for listening to control commands.
+	*/
+	int ep_control_read;
+
+	/**
+		 USB endpoint for writing control commands.
+	*/
+	int ep_control_write;
+
+	/**
+		 URB for listening to PODxt Pro control endpoint.
+	*/
+	struct urb *urb_listen;
+
+	/**
+		 Buffer for listening to PODxt Pro control endpoint.
+	*/
+	unsigned char *buffer_listen;
+
+	/**
+		 Buffer for message to be processed.
+	*/
+	unsigned char *buffer_message;
+
+	/**
+		 Length of message to be processed.
+	*/
+	int message_length;
+};
+
+
+extern char *line6_alloc_sysex_buffer(struct usb_line6 *line6, int code1, int code2, int size);
+extern ssize_t line6_nop_read(struct device *dev, DEVICE_ATTRIBUTE char *buf);
+extern ssize_t line6_nop_write(struct device *dev, DEVICE_ATTRIBUTE const char *buf, size_t count);
+extern int line6_read_data(struct usb_line6 *line6, int address, void *data, size_t datalen);
+extern int line6_read_serial_number(struct usb_line6 *line6, int *serial_number);
+extern int line6_send_program(struct usb_line6 *line6, int value);
+extern int line6_send_raw_message(struct usb_line6 *line6, const char *buffer, int size);
+extern int line6_send_raw_message_async(struct usb_line6 *line6, const char *buffer, int size);
+extern int line6_send_sysex_message(struct usb_line6 *line6, const char *buffer, int size);
+extern ssize_t line6_set_raw(struct device *dev, DEVICE_ATTRIBUTE const char *buf, size_t count);
+extern int line6_transmit_parameter(struct usb_line6 *line6, int param, int value);
+extern int line6_write_data(struct usb_line6 *line6, int address, void *data, size_t datalen);
+extern void line6_write_hexdump(struct usb_line6 *line6, char dir, const unsigned char *buffer, int size);
+
+
+#endif

drivers/staging/line6/dumprequest.c

+/*
+ * 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 "dumprequest.h"
+
+
+/*
+	Set "dump in progress" flag.
+*/
+void line6_dump_started(struct line6_dump_request *l6dr, int dest)
+{
+	l6dr->in_progress = dest;
+}
+
+/*
+	Invalidate current channel, i.e., set "dump in progress" flag.
+	Reading from the "dump" special file blocks until dump is completed.
+*/
+void line6_invalidate_current(struct line6_dump_request *l6dr)
+{
+	line6_dump_started(l6dr, LINE6_DUMP_CURRENT);
+}
+
+/*
+	Clear "dump in progress" flag and notify waiting processes.
+*/
+void line6_dump_finished(struct line6_dump_request *l6dr)
+{
+	l6dr->in_progress = LINE6_DUMP_NONE;
+	wake_up_interruptible(&l6dr->wait);
+}
+
+/*
+	Send an asynchronous channel dump request.
+*/
+int line6_dump_request_async(struct line6_dump_request *l6dr, struct usb_line6 *line6, int num)
+{
+	int ret;
+	line6_invalidate_current(l6dr);
+	ret = line6_send_raw_message_async(line6, l6dr->reqbufs[num].buffer, l6dr->reqbufs[num].length);
+
+	if(ret < 0)
+		line6_dump_finished(l6dr);
+
+	return ret;
+}
+
+/*
+	Send an asynchronous dump request after a given interval.
+*/
+void line6_startup_delayed(struct line6_dump_request *l6dr, int seconds,
+													 void (*function)(unsigned long), void *data)
+{
+	l6dr->timer.expires = jiffies + seconds * HZ;
+	l6dr->timer.function = function;
+	l6dr->timer.data = (unsigned long)data;
+	add_timer(&l6dr->timer);
+}
+
+/*
+	Wait for completion.
+*/
+int line6_wait_dump(struct line6_dump_request *l6dr, int nonblock)
+{
+	int retval = 0;
+	DECLARE_WAITQUEUE(wait, current);
+	add_wait_queue(&l6dr->wait, &wait);
+	current->state = TASK_INTERRUPTIBLE;
+
+	while(l6dr->in_progress) {
+		if(nonblock) {
+			retval = -EAGAIN;
+			break;
+		}
+
+		if(signal_pending(current)) {
+			retval = -ERESTARTSYS;
+			break;
+		}
+		else
+			schedule();
+	}
+
+	current->state = TASK_RUNNING;
+	remove_wait_queue(&l6dr->wait, &wait);
+	return retval;
+}
+
+/*
+	Initialize dump request buffer.
+*/
+int line6_dumpreq_initbuf(struct line6_dump_request *l6dr, const void *buf, size_t len, int num)
+{
+	l6dr->reqbufs[num].buffer = kmalloc(len, GFP_KERNEL);
+	if(l6dr->reqbufs[num].buffer == NULL) return -ENOMEM;
+	memcpy(l6dr->reqbufs[num].buffer, buf, len);
+	l6dr->reqbufs[num].length = len;
+	return 0;
+}
+
+/*
+	Initialize dump request data structure (including one buffer).
+*/
+int line6_dumpreq_init(struct line6_dump_request *l6dr, const void *buf, size_t len)
+{
+	int ret;
+	ret = line6_dumpreq_initbuf(l6dr, buf, len, 0);
+	if(ret < 0) return ret;
+	init_waitqueue_head(&l6dr->wait);
+	init_timer(&l6dr->timer);
+	return 0;
+}
+
+/*
+	Destruct dump request data structure.
+*/
+void line6_dumpreq_destructbuf(struct line6_dump_request *l6dr, int num)
+{
+	if(l6dr == NULL) return;
+	if(l6dr->reqbufs[num].buffer == NULL) return;
+	kfree(l6dr->reqbufs[num].buffer);
+	l6dr->reqbufs[num].buffer = NULL;
+}
+
+/*
+	Destruct dump request data structure.
+*/
+void line6_dumpreq_destruct(struct line6_dump_request *l6dr)
+{
+	if(l6dr->reqbufs[0].buffer == NULL) return;
+	line6_dumpreq_destructbuf(l6dr, 0);
+	l6dr->ok = 1;
+	del_timer_sync(&l6dr->timer);
+}

drivers/staging/line6/dumprequest.h

+/*
+ * 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 DUMPREQUEST_H
+#define DUMPREQUEST_H
+
+
+#include <linux/usb.h>
+#include <linux/wait.h>
+
+#include <sound/core.h>
+
+
+enum {
+	LINE6_DUMP_NONE,
+	LINE6_DUMP_CURRENT
+};
+
+
+struct line6_dump_reqbuf {
+	/**
+		 Buffer for dump requests.
+	*/
+	unsigned char *buffer;
+
+	/**
+		 Size of dump request.
+	*/
+	size_t length;
+};
+
+/**
+	 Provides the functionality to request channel/model/... dump data from a
+	 Line6 device.
+*/
+struct line6_dump_request {
+	/**
+		 Wait queue for access to program dump data.
+	*/
+	wait_queue_head_t wait;
+
+	/**
+		 Indicates an unfinished program dump request.
+		 0: no dump
+		 1: dump current settings
+		 Other device-specific values are also allowed.
+	*/
+	int in_progress;
+
+	/**
+		 Timer for delayed dump request.
+	*/
+	struct timer_list timer;
+
+	/**
+		 Flag if initial dump request has been successful.
+	*/
+	char ok;
+
+	/**
+		 Dump request buffers
+	*/
+	struct line6_dump_reqbuf reqbufs[1];
+};
+
+extern void line6_dump_finished(struct line6_dump_request *l6dr);
+extern int line6_dump_request_async(struct line6_dump_request *l6dr, struct usb_line6 *line6, int num);
+extern void line6_dump_started(struct line6_dump_request *l6dr, int dest);
+extern void line6_dumpreq_destruct(struct line6_dump_request *l6dr);
+extern void line6_dumpreq_destructbuf(struct line6_dump_request *l6dr, int num);
+extern int line6_dumpreq_init(struct line6_dump_request *l6dr, const void *buf, size_t len);
+extern int line6_dumpreq_initbuf(struct line6_dump_request *l6dr, const void *buf, size_t len, int num);
+extern void line6_invalidate_current(struct line6_dump_request *l6dr);
+extern void line6_startup_delayed(struct line6_dump_request *l6dr, int seconds,
+																	void (*function)(unsigned long), void *data);
+extern int line6_wait_dump(struct line6_dump_request *l6dr, int nonblock);
+
+
+#endif

drivers/staging/line6/midi.c

+/*
+ * 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 <linux/usb.h>
+
+#include <sound/core.h>
+#include <sound/rawmidi.h>
+
+#include "audio.h"
+#include "midi.h"
+#include "pod.h"
+#include "usbdefs.h"
+
+
+#define USE_MIDIBUF      1
+#define OUTPUT_DUMP_ONLY 0
+
+
+#define line6_rawmidi_substream_midi(substream) ((struct snd_line6_midi *)((substream)->rmidi->private_data))
+
+
+static int send_midi_async(struct usb_line6 *line6, unsigned char *data, int length);
+
+
+/*
+	Pass data received via USB to MIDI.
+*/
+void line6_midi_receive(struct usb_line6 *line6, unsigned char *data, int length)
+{
+	if(line6->line6midi->substream_receive)
+		snd_rawmidi_receive(line6->line6midi->substream_receive, data, length);
+}
+
+/*
+	Read data from MIDI buffer and transmit them via USB.
+*/
+static void line6_midi_transmit(struct snd_rawmidi_substream *substream)
+{
+	struct usb_line6 *line6 = line6_rawmidi_substream_midi(substream)->line6;
+	struct snd_line6_midi *line6midi = line6->line6midi;
+	struct MidiBuffer *mb = &line6midi->midibuf_out;
+	unsigned long flags;
+	unsigned char chunk[line6->max_packet_size];
+	int req, done;
+
+	spin_lock_irqsave(&line6->line6midi->midi_transmit_lock, flags);
+
+	for(;;) {
+		req = min(midibuf_bytes_free(mb), line6->max_packet_size);
+		done = snd_rawmidi_transmit_peek(substream, chunk, req);
+
+		if(done == 0)
+			break;
+
+#if DO_DUMP_MIDI_SEND
+		line6_write_hexdump(line6, 's', chunk, done);
+#endif
+		midibuf_write(mb, chunk, done);
+		snd_rawmidi_transmit_ack(substream, done);
+	}
+
+	for(;;) {
+		done = midibuf_read(mb, chunk, line6->max_packet_size);
+
+		if(done == 0)
+			break;
+
+		if(midibuf_skip_message(mb, line6midi->midi_mask_transmit))
+			continue;
+
+		send_midi_async(line6, chunk, done);
+	}
+
+	spin_unlock_irqrestore(&line6->line6midi->midi_transmit_lock, flags);
+}
+
+/*
+	Notification of completion of MIDI transmission.
+*/
+static void midi_sent(struct urb *urb PT_REGS)
+{
+	unsigned long flags;
+	int status;
+	int num;
+	struct usb_line6 *line6 = (struct usb_line6 *)urb->context;
+
+	status = urb->status;
+	kfree(urb->transfer_buffer);
+	usb_free_urb(urb);
+
+	if(status == -ESHUTDOWN)
+		return;
+
+	spin_lock_irqsave(&line6->line6midi->send_urb_lock, flags);
+	num = --line6->line6midi->num_active_send_urbs;
+
+	if(num == 0) {
+		line6_midi_transmit(line6->line6midi->substream_transmit);
+		num = line6->line6midi->num_active_send_urbs;
+	}
+
+	if(num == 0)
+		wake_up_interruptible(&line6->line6midi->send_wait);
+
+	spin_unlock_irqrestore(&line6->line6midi->send_urb_lock, flags);
+}
+
+/*
+	Send an asynchronous MIDI message.
+	Assumes that line6->line6midi->send_urb_lock is held
+	(i.e., this function is serialized).
+*/
+static int send_midi_async(struct usb_line6 *line6, unsigned char *data, int length)
+{
+	struct urb *urb;
+	int retval;
+	unsigned char *transfer_buffer;
+
+	urb = usb_alloc_urb(0, GFP_ATOMIC);
+
+	if(urb == 0) {
+		dev_err(line6->ifcdev, "Out of memory\n");
+		return -ENOMEM;
+	}
+
+#if DO_DUMP_URB_SEND
+	line6_write_hexdump(line6, 'S', data, length);
+#endif
+
+	transfer_buffer = (unsigned char *)kmalloc(length, GFP_ATOMIC);
+
+	if(transfer_buffer == 0) {
+		usb_free_urb(urb);
+		dev_err(line6->ifcdev, "Out of memory\n");
+		return -ENOMEM;
+	}
+
+	memcpy(transfer_buffer, data, length);
+	usb_fill_int_urb(urb,
+									 line6->usbdev,
+									 usb_sndbulkpipe(line6->usbdev, line6->ep_control_write),
+									 transfer_buffer, length, midi_sent, line6, line6->interval);
+	urb->actual_length = 0;
+	retval = usb_submit_urb(urb, GFP_ATOMIC);
+
+	if(retval < 0) {
+		dev_err(line6->ifcdev, "usb_submit_urb failed\n");
+		usb_free_urb(urb);
+		return -EINVAL;
+	}
+
+	++line6->line6midi->num_active_send_urbs;
+
+	switch(line6->usbdev->descriptor.idProduct) {
+	case LINE6_DEVID_BASSPODXT:
+	case LINE6_DEVID_BASSPODXTLIVE:
+	case LINE6_DEVID_BASSPODXTPRO:
+	case LINE6_DEVID_PODXT:
+	case LINE6_DEVID_PODXTLIVE:
+	case LINE6_DEVID_PODXTPRO:
+	case LINE6_DEVID_POCKETPOD:
+		pod_midi_postprocess((struct usb_line6_pod *)line6, data, length);
+		break;
+
+	default:
+		MISSING_CASE;
+	}
+
+	return 0;
+}
+
+static int line6_midi_output_open(struct snd_rawmidi_substream *substream)
+{
+	return 0;
+}
+
+static int line6_midi_output_close(struct snd_rawmidi_substream *substream)
+{
+	return 0;
+}
+
+static void line6_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
+{
+	unsigned long flags;
+	struct usb_line6 *line6 = line6_rawmidi_substream_midi(substream)->line6;
+
+	line6->line6midi->substream_transmit = substream;
+	spin_lock_irqsave(&line6->line6midi->send_urb_lock, flags);
+
+	if(line6->line6midi->num_active_send_urbs == 0)
+		line6_midi_transmit(substream);
+
+	spin_unlock_irqrestore(&line6->line6midi->send_urb_lock, flags);
+}
+
+static void line6_midi_output_drain(struct snd_rawmidi_substream *substream)
+{
+	struct usb_line6 *line6 = line6_rawmidi_substream_midi(substream)->line6;
+	wait_queue_head_t *head = &line6->line6midi->send_wait;
+	DECLARE_WAITQUEUE(wait, current);
+	add_wait_queue(head, &wait);
+	current->state = TASK_INTERRUPTIBLE;
+
+	while(line6->line6midi->num_active_send_urbs > 0)
+		if(signal_pending(current))
+			break;
+		else
+			schedule();
+
+	current->state = TASK_RUNNING;
+	remove_wait_queue(head, &wait);
+}
+
+static int line6_midi_input_open(struct snd_rawmidi_substream *substream)
+{
+	return 0;
+}
+
+static int line6_midi_input_close(struct snd_rawmidi_substream *substream)
+{
+	return 0;
+}
+
+static void line6_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
+{
+	struct usb_line6 *line6 = line6_rawmidi_substream_midi(substream)->line6;
+
+	if(up)
+		line6->line6midi->substream_receive = substream;
+	else
+		line6->line6midi->substream_receive = 0;
+}
+
+static struct snd_rawmidi_ops line6_midi_output_ops = {
+	.open = line6_midi_output_open,
+	.close = line6_midi_output_close,
+	.trigger = line6_midi_output_trigger,
+	.drain = line6_midi_output_drain,
+};
+
+static struct snd_rawmidi_ops line6_midi_input_ops = {
+	.open = line6_midi_input_open,
+	.close = line6_midi_input_close,
+	.trigger = line6_midi_input_trigger,
+};
+
+/*
+	Cleanup the Line6 MIDI device.
+*/
+static void line6_cleanup_midi(struct snd_rawmidi *rmidi)
+{
+}
+
+/* Create a MIDI device */
+static int snd_line6_new_midi(struct snd_line6_midi *line6midi)
+{
+	struct snd_rawmidi *rmidi;
+	int err;
+
+	if((err = snd_rawmidi_new(line6midi->line6->card, "Line6 MIDI", 0, 1, 1, &rmidi)) < 0)
+		return err;
+
+	rmidi->private_data = line6midi;
+	rmidi->private_free = line6_cleanup_midi;
+	strcpy(rmidi->name, line6midi->line6->properties->name);
+
+	rmidi->info_flags =
+		SNDRV_RAWMIDI_INFO_OUTPUT |
+		SNDRV_RAWMIDI_INFO_INPUT |
+		SNDRV_RAWMIDI_INFO_DUPLEX;
+
+	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &line6_midi_output_ops);
+	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &line6_midi_input_ops);
+	return 0;
+}
+
+/*
+	"read" request on "midi_mask_transmit" special file.
+*/
+static ssize_t midi_get_midi_mask_transmit(struct device *dev, DEVICE_ATTRIBUTE char *buf)
+{
+	struct usb_interface *interface = to_usb_interface(dev);
+	struct usb_line6 *line6 = usb_get_intfdata(interface);
+	return sprintf(buf, "%d\n", line6->line6midi->midi_mask_transmit);
+}
+
+/*
+	"write" request on "midi_mask" special file.
+*/
+static ssize_t midi_set_midi_mask_transmit(struct device *dev, DEVICE_ATTRIBUTE const char *buf, size_t count)
+{
+	struct usb_interface *interface = to_usb_interface(dev);
+	struct usb_line6 *line6 = usb_get_intfdata(interface);
+	int value = simple_strtoul(buf, NULL, 10);
+	line6->line6midi->midi_mask_transmit = value;
+	return count;
+}
+
+/*
+	"read" request on "midi_mask_receive" special file.
+*/
+static ssize_t midi_get_midi_mask_receive(struct device *dev, DEVICE_ATTRIBUTE char *buf)
+{
+	struct usb_interface *interface = to_usb_interface(dev);
+	struct usb_line6 *line6 = usb_get_intfdata(interface);
+	return sprintf(buf, "%d\n", line6->line6midi->midi_mask_receive);
+}
+
+/*
+	"write" request on "midi_mask" special file.
+*/
+static ssize_t midi_set_midi_mask_receive(struct device *dev, DEVICE_ATTRIBUTE const char *buf, size_t count)
+{
+	struct usb_interface *interface = to_usb_interface(dev);
+	struct usb_line6 *line6 = usb_get_intfdata(interface);
+	int value = simple_strtoul(buf, NULL, 10);
+	line6->line6midi->midi_mask_receive = value;
+	return count;
+}
+
+static DEVICE_ATTR(midi_mask_transmit, S_IWUGO | S_IRUGO, midi_get_midi_mask_transmit, midi_set_midi_mask_transmit);
+static DEVICE_ATTR(midi_mask_receive, S_IWUGO | S_IRUGO, midi_get_midi_mask_receive, midi_set_midi_mask_receive);
+
+/* MIDI device destructor */
+static int snd_line6_midi_free(struct snd_device *device)
+{
+	struct snd_line6_midi *line6midi = device->device_data;
+	device_remove_file(line6midi->line6->ifcdev, &dev_attr_midi_mask_transmit);
+	device_remove_file(line6midi->line6->ifcdev, &dev_attr_midi_mask_receive);
+	midibuf_destroy(&line6midi->midibuf_in);
+	midibuf_destroy(&line6midi->midibuf_out);
+	return 0;
+}
+
+/*
+	Initialize the Line6 MIDI subsystem.
+*/
+int line6_init_midi(struct usb_line6 *line6)
+{
+	static struct snd_device_ops midi_ops = {
+		.dev_free = snd_line6_midi_free,
+	};
+
+	int err;
+	struct snd_line6_midi *line6midi;
+
+	if(!(line6->properties->capabilities & LINE6_BIT_CONTROL))
+		return 0;  /* skip MIDI initialization and report success */
+
+	line6midi = kzalloc(sizeof(struct snd_line6_midi), GFP_KERNEL);
+
+	if(line6midi == NULL)
+		return -ENOMEM;
+
+	err = midibuf_init(&line6midi->midibuf_in, MIDI_BUFFER_SIZE, 0);
+
+	if(err < 0)
+		return err;
+
+	err = midibuf_init(&line6midi->midibuf_out, MIDI_BUFFER_SIZE, 1);
+
+	if(err < 0)
+		return err;
+
+	line6midi->line6 = line6;
+	line6midi->midi_mask_transmit = 1;
+	line6midi->midi_mask_receive = 4;
+	line6->line6midi = line6midi;
+
+	if((err = snd_device_new(line6->card, SNDRV_DEV_RAWMIDI, line6midi, &midi_ops)) < 0)
+		return err;
+
+	snd_card_set_dev(line6->card, line6->ifcdev);
+
+	if((err = snd_line6_new_midi(line6midi)) < 0)
+		return err;
+
+	if((err = device_create_file(line6->ifcdev, &dev_attr_midi_mask_transmit)) < 0)
+		return err;
+
+	if((err = device_create_file(line6->ifcdev, &dev_attr_midi_mask_receive)) < 0)
+		return err;
+
+	init_waitqueue_head(&line6midi->send_wait);
+	spin_lock_init(&line6midi->send_urb_lock);
+	spin_lock_init(&line6midi->midi_transmit_lock);
+	return 0;
+}

drivers/staging/line6/midi.h

+/*
+ * 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

drivers/staging/line6/midibuf.c

+/*
+ * 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 "config.h"
+
+#include <linux/slab.h>
+
+#include "midibuf.h"
+
+
+int midibuf_message_length(unsigned char code)
+{
+	if(code < 0x80)
+		return -1;
+	else if(code < 0xf0) {
+		static const int length[] = { 3, 3, 3, 3, 2, 2, 3 };
+		return length[(code >> 4) - 8];
+	}
+	else {
+		/*
+			Note that according to the MIDI specification 0xf2 is the "Song Position
+			Pointer", but this is used by Line6 to send sysex messages to the host.
+		*/
+		static const int length[] = { -1, 2, -1, 2, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1 };
+		return length[code & 0x0f];
+	}
+}
+
+void midibuf_reset(struct MidiBuffer *this)
+{
+	this->pos_read = this->pos_write = this->full = 0;
+	this->command_prev = -1;
+}
+
+int midibuf_init(struct MidiBuffer *this, int size, int split)
+{
+	this->buf = (unsigned char *)kmalloc(size, GFP_KERNEL);
+
+	if(this->buf == 0)
+		return -ENOMEM;
+
+	this->size = size;
+	this->split = split;
+	midibuf_reset(this);
+	return 0;
+}
+
+void midibuf_status(struct MidiBuffer *this)
+{
+	printk("midibuf size=%d split=%d pos_read=%d pos_write=%d full=%d command_prev=%02x\n",
+				 this->size, this->split, this->pos_read, this->pos_write, this->full, this->command_prev);
+}
+
+int midibuf_is_empty(struct MidiBuffer *this)
+{
+	return (this->pos_read == this->pos_write) && !this->full;
+}
+
+int midibuf_is_full(struct MidiBuffer *this)
+{
+	return this->full;
+}
+
+int midibuf_bytes_free(struct MidiBuffer *this)
+{
+	return
+		midibuf_is_full(this) ?
+		0 :
+		(this->pos_read - this->pos_write + this->size - 1) % this->size + 1;
+}
+
+int midibuf_bytes_used(struct MidiBuffer *this)
+{
+	return
+		midibuf_is_empty(this) ?
+		0 :
+		(this->pos_write - this->pos_read + this->size - 1) % this->size + 1;
+}
+
+int midibuf_write(struct MidiBuffer *this, unsigned char *data, int length)
+{
+	int bytes_free;
+	int length1, length2;
+	int skip_active_sense = 0;
+
+	if(midibuf_is_full(this) || (length <= 0))
+		return 0;
+
+	/* skip trailing active sense */
+	if(data[length - 1] == 0xfe) {
+		--length;
+		skip_active_sense = 1;
+	}
+
+	bytes_free = midibuf_bytes_free(this);
+
+	if(length > bytes_free)
+		length = bytes_free;
+
+	if(length > 0) {
+		length1 = this->size - this->pos_write;
+
+		if(length < length1) {
+			/* no buffer wraparound */
+			memcpy(this->buf + this->pos_write, data, length);
+			this->pos_write += length;
+		}
+		else {
+			/* buffer wraparound */
+			length2 = length - length1;
+			memcpy(this->buf + this->pos_write, data, length1);
+			memcpy(this->buf, data + length1, length2);
+			this->pos_write = length2;
+		}
+
+		if(this->pos_write == this->pos_read)
+			this->full = 1;
+	}
+
+	return length + skip_active_sense;
+}
+
+int midibuf_read(struct MidiBuffer *this, unsigned char *data, int length)
+{
+	int bytes_used;
+	int length1, length2;
+	int command;
+	int midi_length;
+	int repeat = 0;
+	int i;
+
+	if(length < 3)
+		return -EINVAL;  /* we need to be able to store at least a 3 byte MIDI message */
+
+	if(midibuf_is_empty(this))
+		return 0;
+
+	bytes_used = midibuf_bytes_used(this);
+
+	if(length > bytes_used)
+		length = bytes_used;
+
+	length1 = this->size - this->pos_read;
+
+	/* check MIDI command length */
+	command = this->buf[this->pos_read];
+
+	if(command & 0x80) {
+		midi_length = midibuf_message_length(command);
+		this->command_prev = command;
+	}
+	else {
+		if(this->command_prev > 0) {
+			int midi_length_prev = midibuf_message_length(this->command_prev);
+
+			if(midi_length_prev > 0) {
+				midi_length = midi_length_prev - 1;
+				repeat = 1;
+			}
+			else
+				midi_length = -1;
+		}
+		else
+			midi_length = -1;
+	}
+
+	if(midi_length < 0) {
+		/* search for end of message */
+		if(length < length1) {
+			/* no buffer wraparound */
+			for(i = 1; i < length; ++i)
+				if(this->buf[this->pos_read + i] & 0x80)
+					break;
+
+			midi_length = i;
+		}
+		else {
+			/* buffer wraparound */
+			length2 = length - length1;
+
+			for(i = 1; i < length1; ++i)
+				if(this->buf[this->pos_read + i] & 0x80)
+					break;
+
+			if(i < length1)
+				midi_length = i;
+			else {
+				for(i = 0; i < length2; ++i)
+					if(this->buf[i] & 0x80)
+						break;
+
+				midi_length = length1 + i;
+			}
+		}
+
+		if(midi_length == length)
+			midi_length = -1;  /* end of message not found */
+	}
+
+	if(midi_length < 0) {
+		if(!this->split)
+			return 0;  /* command is not yet complete */
+	}
+	else {
+		if(length < midi_length)
+			return 0;  /* command is not yet complete */
+
+		length = midi_length;
+	}
+
+	if(length < length1) {
+		/* no buffer wraparound */
+		memcpy(data + repeat, this->buf + this->pos_read, length);
+		this->pos_read += length;
+	}
+	else {
+		/* buffer wraparound */
+		length2 = length - length1;
+		memcpy(data + repeat, this->buf + this->pos_read, length1);
+		memcpy(data + repeat + length1, this->buf, length2);
+		this->pos_read = length2;
+	}
+
+	if(repeat)
+		data[0] = this->command_prev;
+
+	this->full = 0;
+	return length + repeat;
+}
+
+int midibuf_ignore(struct MidiBuffer *this, int length)
+{
+	int bytes_used = midibuf_bytes_used(this);
+
+	if(length > bytes_used)
+		length = bytes_used;
+
+	this->pos_read = (this->pos_read + length) % this->size;
+	this->full = 0;
+	return length;
+}
+
+int midibuf_skip_message(struct MidiBuffer *this, unsigned short mask)
+{
+	int cmd = this->command_prev;
+
+	if((cmd >= 0x80) && (cmd < 0xf0))
+		if((mask & (1 << (cmd & 0x0f))) == 0)
+			return 1;
+
+	return 0;
+}
+
+void midibuf_destroy(struct MidiBuffer *this)
+{
+	if(this->buf != 0) {
+		kfree(this->buf);
+		this->buf = 0;
+	}
+}

drivers/staging/line6/midibuf.h

+/*
+ * 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 MIDIBUF_H
+#define MIDIBUF_H
+
+
+struct MidiBuffer
+{
+	unsigned char *buf;
+	int size;
+	int split;
+	int pos_read, pos_write;
+	int full;
+	int command_prev;
+};
+
+
+extern int midibuf_bytes_used(struct MidiBuffer *mb);
+extern int midibuf_bytes_free(struct MidiBuffer *mb);
+extern void midibuf_destroy(struct MidiBuffer *mb);
+extern int midibuf_ignore(struct MidiBuffer *mb, int length);
+extern int midibuf_init(struct MidiBuffer *mb, int size, int split);
+extern int midibuf_read(struct MidiBuffer *mb, unsigned char *data, int length);
+extern void midibuf_reset(struct MidiBuffer *mb);
+extern int midibuf_skip_message(struct MidiBuffer *mb, unsigned short mask);
+extern void midibuf_status(struct MidiBuffer *mb);
+extern int midibuf_write(struct MidiBuffer *mb, unsigned char *data, int length);
+
+
+#endif

drivers/staging/line6/pcm.c

+/*
+ * 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/control.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+
+#include "audio.h"
+#include "capture.h"
+#include "playback.h"
+#include "pod.h"
+
+
+/* trigger callback */
+int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22)
+	struct list_head *pos;
+#endif
+	struct snd_pcm_substream *s;
+	int err;
+	unsigned long flags;
+
+	spin_lock_irqsave(&line6pcm->lock_trigger, flags);
+	clear_bit(BIT_PREPARED, &line6pcm->flags);
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22)
+	snd_pcm_group_for_each(pos, substream) {
+		s = snd_pcm_group_substream_entry(pos);
+#else
+	snd_pcm_group_for_each_entry(s, substream) {
+#endif
+		switch(s->stream) {
+		case SNDRV_PCM_STREAM_PLAYBACK:
+			err = snd_line6_playback_trigger(s, cmd);
+
+			if(err < 0) {
+				spin_unlock_irqrestore(&line6pcm->lock_trigger, flags);
+				return err;
+			}
+
+			break;
+
+		case SNDRV_PCM_STREAM_CAPTURE:
+			err = snd_line6_capture_trigger(s, cmd);
+
+			if(err < 0) {
+				spin_unlock_irqrestore(&line6pcm->lock_trigger, flags);
+				return err;
+			}
+
+			break;
+
+		default:
+			dev_err(s2m(substream), "Unknown stream direction %d\n", s->stream);
+		}
+	}
+
+	spin_unlock_irqrestore(&line6pcm->lock_trigger, flags);
+	return 0;
+}
+
+/* control info callback */
+static int snd_line6_control_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) {
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = 2;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = 256;
+	return 0;
+}
+
+/* control get callback */
+static int snd_line6_control_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) {
+	int i;
+	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
+
+	for(i = 2; i--;)
+		ucontrol->value.integer.value[i] = line6pcm->volume[i];
+
+	return 0;
+}
+
+/* control put callback */
+static int snd_line6_control_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) {
+	int i, changed = 0;
+	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
+
+	for(i = 2; i--;)
+		if(line6pcm->volume[i] != ucontrol->value.integer.value[i]) {
+			line6pcm->volume[i] = ucontrol->value.integer.value[i];
+			changed = 1;
+		}
+
+	return changed;
+}
+
+/* control definition */
+static struct snd_kcontrol_new line6_control = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "PCM Playback Volume",
+	.index = 0,
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+	.info = snd_line6_control_info,
+	.get = snd_line6_control_get,
+	.put = snd_line6_control_put
+};
+
+/*
+	Cleanup the PCM device.
+*/
+static void line6_cleanup_pcm(struct snd_pcm *pcm)
+{
+	int i;
+	struct snd_line6_pcm *line6pcm = snd_pcm_chip(pcm);
+
+	for(i = LINE6_ISO_BUFFERS; i--;) {
+		if(line6pcm->urb_audio_out[i]) {
+			usb_kill_urb(line6pcm->urb_audio_out[i]);
+			usb_free_urb(line6pcm->urb_audio_out[i]);
+		}
+		if(line6pcm->urb_audio_in[i]) {
+			usb_kill_urb(line6pcm->urb_audio_in[i]);
+			usb_free_urb(line6pcm->urb_audio_in[i]);
+		}
+	}
+}
+
+/* create a PCM device */
+static int snd_line6_new_pcm(struct snd_line6_pcm *line6pcm)
+{
+	struct snd_pcm *pcm;
+	int err;
+
+	if((err = snd_pcm_new(line6pcm->line6->card, (char *)line6pcm->line6->properties->name, 0, 1, 1, &pcm)) < 0)
+		return err;
+
+	pcm->private_data = line6pcm;
+	pcm->private_free = line6_cleanup_pcm;
+	line6pcm->pcm = pcm;
+	strcpy(pcm->name, line6pcm->line6->properties->name);
+
+	/* set operators */
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_line6_playback_ops);
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_line6_capture_ops);
+
+	/* pre-allocation of buffers */
+	snd_pcm_lib_preallocate_pages_for_all(pcm,
+																				SNDRV_DMA_TYPE_CONTINUOUS,
+																				snd_dma_continuous_data(GFP_KERNEL),
+																				64 * 1024, 128 * 1024);
+
+	return 0;
+}
+
+/* PCM device destructor */
+static int snd_line6_pcm_free(struct snd_device *device)
+{
+	return 0;
+}
+
+/*
+	Create and register the PCM device and mixer entries.
+	Create URBs for playback and capture.
+*/
+int line6_init_pcm(struct usb_line6 *line6, struct line6_pcm_properties *properties)
+{
+	static struct snd_device_ops pcm_ops = {
+		.dev_free = snd_line6_pcm_free,
+	};
+
+	int err;
+	int ep_read = 0, ep_write = 0;
+	struct snd_line6_pcm *line6pcm;
+
+	if(!(line6->properties->capabilities & LINE6_BIT_PCM))
+		return 0;  /* skip PCM initialization and report success */
+
+	/* initialize PCM subsystem based on product id: */
+	switch(line6->product) {
+	case LINE6_DEVID_BASSPODXT:
+  case LINE6_DEVID_BASSPODXTLIVE:
+  case LINE6_DEVID_BASSPODXTPRO:
+  case LINE6_DEVID_PODXT:
+  case LINE6_DEVID_PODXTLIVE:
+  case LINE6_DEVID_PODXTPRO:
+		ep_read  = 0x82;
+		ep_write = 0x01;
+		break;
+
+  case LINE6_DEVID_PODX3:
+  case LINE6_DEVID_PODX3LIVE:
+		ep_read  = 0x86;
+		ep_write = 0x02;
+		break;
+
+  case LINE6_DEVID_POCKETPOD:
+		ep_read  = 0x82;
+		ep_write = 0x02;
+		break;
+
+    case LINE6_DEVID_GUITARPORT:
+	case LINE6_DEVID_TONEPORT_GX:
+		ep_read  = 0x82;
+		ep_write = 0x01;
+		break;
+
+	case LINE6_DEVID_TONEPORT_UX1:
+		ep_read  = 0x00;
+		ep_write = 0x00;
+		break;
+
+	case LINE6_DEVID_TONEPORT_UX2:
+		ep_read  = 0x87;
+		ep_write = 0x00;
+		break;
+
+	default:
+		MISSING_CASE;
+	}
+
+	line6pcm = kzalloc(sizeof(struct snd_line6_pcm), GFP_KERNEL);
+
+	if(line6pcm == NULL)
+		return -ENOMEM;
+
+	line6pcm->volume[0] = line6pcm->volume[1] = 128;
+	line6pcm->line6 = line6;
+	line6pcm->ep_audio_read = ep_read;
+	line6pcm->ep_audio_write = ep_write;
+	line6pcm->max_packet_size = usb_maxpacket(line6->usbdev, usb_rcvintpipe(line6->usbdev, ep_read), 0);
+	line6pcm->properties = properties;
+	line6->line6pcm = line6pcm;
+
+	/* PCM device: */
+	if((err = snd_device_new(line6->card, SNDRV_DEV_PCM, line6, &pcm_ops)) < 0)
+		return err;
+
+	snd_card_set_dev(line6->card, line6->ifcdev);
+
+	if((err = snd_line6_new_pcm(line6pcm)) < 0)
+		return err;
+
+	spin_lock_init(&line6pcm->lock_audio_out);
+	spin_lock_init(&line6pcm->lock_audio_in);
+	spin_lock_init(&line6pcm->lock_trigger);
+
+	if((err = create_audio_out_urbs(line6pcm)) < 0)
+		return err;
+
+	if((err = create_audio_in_urbs(line6pcm)) < 0)
+		return err;
+
+	/* mixer: */
+	if((err = snd_ctl_add(line6->card, snd_ctl_new1(&line6_control, line6pcm))) < 0)
+		return err;
+
+	return 0;
+}
+
+/* prepare pcm callback */
+int snd_line6_prepare(struct snd_pcm_substream *substream)
+{
+	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+
+	if(!test_and_set_bit(BIT_PREPARED, &line6pcm->flags)) {
+		unlink_wait_clear_audio_out_urbs(line6pcm);
+		line6pcm->pos_out = 0;
+		line6pcm->pos_out_done = 0;
+
+		unlink_wait_clear_audio_in_urbs(line6pcm);
+		line6pcm->bytes_out = 0;
+		line6pcm->pos_in_done = 0;
+		line6pcm->bytes_in = 0;
+	}
+
+	return 0;
+}

drivers/staging/line6/pcm.h

+/*
+ * 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.
+ *
+ */
+
+/*
+	PCM interface to POD series devices.
+*/
+
+#ifndef PCM_H
+#define PCM_H
+
+
+#include <sound/pcm.h>
+
+#include "driver.h"
+#include "usbdefs.h"
+
+
+#define LINE6_ISO_BUFFERS 8  /* number of URBs */
+#define LINE6_ISO_PACKETS 2  /* number of USB frames per URB */
+#define LINE6_ISO_INTERVAL 1  /* in a "full speed" device (such as the PODxt Pro) this means 1ms */
+#define LINE6_ISO_PACKET_SIZE_MAX 252  /* this should be queried dynamically from the USB interface! */
+
+
+/*
+	Extract the messaging device from the substream instance
+*/
+#define s2m(s) (((struct snd_line6_pcm *)snd_pcm_substream_chip(s))->line6->ifcdev)
+
+
+enum {
+	BIT_RUNNING_PLAYBACK,
+	BIT_RUNNING_CAPTURE,
+	BIT_PAUSE_PLAYBACK,
+	BIT_PREPARED
+};
+
+struct line6_pcm_properties {
+	struct snd_pcm_hardware snd_line6_playback_hw, snd_line6_capture_hw;
+	struct snd_pcm_hw_constraint_ratdens snd_line6_rates;
+	int bytes_per_frame;
+};
+
+struct snd_line6_pcm
+{
+	/**
+		 Pointer back to the Line6 driver data structure.
+	*/
+	struct usb_line6 *line6;
+
+	/**
+		 Properties.
+	*/
+	struct line6_pcm_properties *properties;
+
+	/**
+		 ALSA pcm stream
+	*/
+	struct snd_pcm *pcm;
+
+	/**
+		 URBs for audio playback.
+	*/
+	struct urb *urb_audio_out[LINE6_ISO_BUFFERS];
+
+	/**
+		 URBs for audio capture.
+	*/
+	struct urb *urb_audio_in[LINE6_ISO_BUFFERS];
+
+	/**
+		 Temporary buffer to hold data when playback buffer wraps.
+	*/
+	unsigned char *wrap_out;
+
+	/**
+		 Temporary buffer for capture.
+		 Since the packet size is not known in advance, this buffer is large enough
+		 to store maximum size packets.
+	*/
+	unsigned char *buffer_in;
+
+	/**
+		 Free frame position in the playback buffer.
+	*/
+	snd_pcm_uframes_t pos_out;
+
+	/**
+		 Count processed bytes for playback.
+		 This is modulo period size (to determine when a period is finished).
+	*/
+	unsigned bytes_out;
+
+	/**
+		 Counter to create desired playback sample rate.
+	*/
+	unsigned count_out;
+
+	/**
+		 Playback period size in bytes
+	*/
+	unsigned period_out;
+
+	/**
+		 Processed frame position in the playback buffer.
+		 The contents of the output ring buffer have been consumed by the USB
+		 subsystem (i.e., sent to the USB device) up to this position.
+	*/
+	snd_pcm_uframes_t pos_out_done;
+
+	/**
+		 Count processed bytes for capture.
+		 This is modulo period size (to determine when a period is finished).
+	*/
+	unsigned bytes_in;
+
+	/**
+		 Counter to create desired capture sample rate.
+	*/
+	unsigned count_in;
+
+	/**
+		 Capture period size in bytes
+	*/
+	unsigned period_in;
+
+	/**
+		 Processed frame position in the capture buffer.
+		 The contents of the output ring buffer have been consumed by the USB
+		 subsystem (i.e., sent to the USB device) up to this position.
+	*/
+	snd_pcm_uframes_t pos_in_done;
+
+	/**
+		 Bit mask of active playback URBs.
+	*/
+	unsigned long active_urb_out;
+
+	/**
+		 Maximum size of USB packet.
+	*/
+	int max_packet_size;
+
+	/**
+		 USB endpoint for listening to audio data.
+	*/
+	int ep_audio_read;
+
+	/**
+		 USB endpoint for writing audio data.
+	*/
+	int ep_audio_write;
+
+	/**
+		 Bit mask of active capture URBs.
+	*/
+	unsigned long active_urb_in;
+
+	/**
+		 Bit mask of playback URBs currently being unlinked.
+	*/
+	unsigned long unlink_urb_out;
+
+	/**
+		 Bit mask of capture URBs currently being unlinked.
+	*/
+	unsigned long unlink_urb_in;
+
+	/**
+		 Spin lock to protect updates of the playback buffer positions (not
+		 contents!)
+	*/
+	spinlock_t lock_audio_out;
+
+	/**
+		 Spin lock to protect updates of the capture buffer positions (not
+		 contents!)
+	*/
+	spinlock_t lock_audio_in;
+
+	/**
+		 Spin lock to protect trigger.
+	*/
+	spinlock_t lock_trigger;
+
+	/**
+		 PCM playback volume (left and right).
+	*/
+	int volume[2];
+
+	/**
+		 Several status bits (see BIT_*).
+	*/
+	unsigned long flags;
+};
+
+
+extern int line6_init_pcm(struct usb_line6 *line6, struct line6_pcm_properties *properties);
+extern int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd);
+extern int snd_line6_prepare(struct snd_pcm_substream *substream);
+
+
+#endif

drivers/staging/line6/playback.c

+/*
+ * 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/pcm.h>
+#include <sound/pcm_params.h>
+
+#include "audio.h"
+#include "pcm.h"
+#include "pod.h"
+
+
+/*
+	Software stereo volume control.
+*/
+static void change_volume(struct urb *urb_out, int volume[], int bytes_per_frame)
+{
+	int chn = 0;
+
+	if(volume[0] == 256 && volume[1] == 256)
+		return;  /* maximum volume - no change */
+
+	if(bytes_per_frame == 4) {
+		short *p, *buf_end;
+		p = (short *)urb_out->transfer_buffer;
+		buf_end = p + urb_out->transfer_buffer_length / sizeof(*p);
+
+		for(; p < buf_end; ++p) {
+			*p = (*p * volume[chn & 1]) >> 8;
+			++chn;
+		}
+	}
+	else if(bytes_per_frame == 6) {
+		unsigned char *p, *buf_end;
+		p = (unsigned char *)urb_out->transfer_buffer;
+		buf_end = p + urb_out->transfer_buffer_length;
+
+		for(; p < buf_end; p += 3) {
+			int val = p[0] + (p[1] << 8) + ((signed char)p[2] << 16);
+			val = (val * volume[chn & 1]) >> 8;
+			p[0] = val;
+			p[1] = val >> 8;
+			p[2] = val >> 16;
+			++chn;
+		}
+	}
+}
+
+/*
+	Find a free URB, prepare audio data, and submit URB.
+*/
+static int submit_audio_out_urb(struct snd_pcm_substream *substream)
+{
+	int index;
+	unsigned long flags;
+	int i, urb_size, urb_frames;
+	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+	const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
+	const int frame_increment = line6pcm->properties->snd_line6_rates.rats[0].num_min;
+	const int frame_factor = line6pcm->properties->snd_line6_rates.rats[0].den * (USB_INTERVALS_PER_SECOND / LINE6_ISO_INTERVAL);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct urb *urb_out;
+
+	spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
+	index = find_first_zero_bit(&line6pcm->active_urb_out, LINE6_ISO_BUFFERS);
+
+	if(index < 0 || index >= LINE6_ISO_BUFFERS) {
+		spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
+		dev_err(s2m(substream), "no free URB found\n");
+		return -EINVAL;
+	}
+
+	urb_out = line6pcm->urb_audio_out[index];
+	urb_size = 0;
+
+	for(i = 0; i < LINE6_ISO_PACKETS; ++i) {
+		/* compute frame size for given sampling rate */
+		int n, fs;
+		struct usb_iso_packet_descriptor *fout = &urb_out->iso_frame_desc[i];
+		line6pcm->count_out += frame_increment;
+		n = line6pcm->count_out / frame_factor;
+		line6pcm->count_out -= n * frame_factor;
+		fs = n * bytes_per_frame;
+		fout->offset = urb_size;
+		fout->length = fs;
+		urb_size += fs;
+	}
+
+	urb_frames = urb_size / bytes_per_frame;
+
+	if(test_bit(BIT_PAUSE_PLAYBACK, &line6pcm->flags)) {
+		urb_out->transfer_buffer = line6pcm->wrap_out;
+		memset(line6pcm->wrap_out, 0, urb_size);
+	}
+	else {
+		if(line6pcm->pos_out + urb_frames > runtime->buffer_size) {
+			/*
+				The transferred area goes over buffer boundary,
+				copy the data to the temp buffer.
+			*/
+			int len;
+			len = runtime->buffer_size - line6pcm->pos_out;
+			urb_out->transfer_buffer = line6pcm->wrap_out;
+
+			if(len > 0) {
+				memcpy(line6pcm->wrap_out, runtime->dma_area + line6pcm->pos_out * bytes_per_frame, len * bytes_per_frame);
+				memcpy(line6pcm->wrap_out + len * bytes_per_frame, runtime->dma_area, (urb_frames - len) * bytes_per_frame);
+			}
+			else
+				dev_err(s2m(substream), "driver bug: len = %d\n", len);  /* this is somewhat paranoid */
+		}
+		else {
+			/* set the buffer pointer */
+			urb_out->transfer_buffer = runtime->dma_area + line6pcm->pos_out * bytes_per_frame;
+		}
+	}
+
+	if((line6pcm->pos_out += urb_frames) >= runtime->buffer_size)
+		line6pcm->pos_out -= runtime->buffer_size;
+
+	urb_out->transfer_buffer_length = urb_size;
+	urb_out->context = substream;
+	change_volume(urb_out, line6pcm->volume, bytes_per_frame);
+
+#if DO_DUMP_PCM_SEND
+	for(i = 0; i < LINE6_ISO_PACKETS; ++i) {
+		struct usb_iso_packet_descriptor *fout = &urb_out->iso_frame_desc[i];
+		line6_write_hexdump(line6pcm->line6, 'P', urb_out->transfer_buffer + fout->offset, fout->length);
+	}
+#endif
+
+	if(usb_submit_urb(urb_out, GFP_ATOMIC) == 0)
+		set_bit(index, &line6pcm->active_urb_out);
+	else
+		dev_err(s2m(substream), "URB out #%d submission failed\n", index);
+
+	spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
+	return 0;
+}
+
+/*
+	Submit all currently available playback URBs.
+*/
+static int submit_audio_out_all_urbs(struct snd_pcm_substream *substream)
+{
+	int ret, i;
+
+	for(i = 0; i < LINE6_ISO_BUFFERS; ++i)
+		if((ret = submit_audio_out_urb(substream)) < 0)
+			return ret;
+
+	return 0;
+}
+
+/*
+	Unlink all currently active playback URBs.
+*/
+static void unlink_audio_out_urbs(struct snd_line6_pcm *line6pcm)
+{
+	unsigned int i;
+
+	for(i = LINE6_ISO_BUFFERS; i--;) {
+		if(test_bit(i, &line6pcm->active_urb_out)) {
+			if(!test_and_set_bit(i, &line6pcm->unlink_urb_out)) {
+				struct urb *u = line6pcm->urb_audio_out[i];
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 14)
+				u->transfer_flags |= URB_ASYNC_UNLINK;
+#endif
+				usb_unlink_urb(u);
+			}
+		}
+	}
+}
+
+/*
+	Wait until unlinking of all currently active playback URBs has been finished.
+*/
+static void wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
+{
+	int timeout = HZ;
+	unsigned int i;
+	int alive;
+
+	do {
+		alive = 0;
+		for (i = LINE6_ISO_BUFFERS; i--;) {
+			if (test_bit(i, &line6pcm->active_urb_out))
+				alive++;
+		}
+		if (! alive)
+			break;
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		schedule_timeout(1);
+	} while (--timeout > 0);
+	if (alive)
+		snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
+
+	line6pcm->active_urb_out = 0;
+	line6pcm->unlink_urb_out = 0;
+}
+
+/*
+	Unlink all currently active playback URBs, and wait for finishing.
+*/
+void unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm)
+{
+	unlink_audio_out_urbs(line6pcm);
+	wait_clear_audio_out_urbs(line6pcm);
+}
+
+/*
+	Callback for completed playback URB.
+*/
+static void audio_out_callback(struct urb *urb PT_REGS)
+{
+	int i, index, length = 0, shutdown = 0;
+	unsigned long flags;
+
+	struct snd_pcm_substream *substream = (struct snd_pcm_substream *)urb->context;
+	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	/* find index of URB */
+	for(index = LINE6_ISO_BUFFERS; index--;)
+		if(urb == line6pcm->urb_audio_out[index])
+			break;
+
+	if(index < 0)
+		return;  /* URB has been unlinked asynchronously */
+
+	for(i = LINE6_ISO_PACKETS; i--;)
+		length += urb->iso_frame_desc[i].length;
+
+	spin_lock_irqsave(&line6pcm->lock_audio_out, flags);
+	line6pcm->pos_out_done += length / line6pcm->properties->bytes_per_frame;
+
+	if(line6pcm->pos_out_done >= runtime->buffer_size)
+		line6pcm->pos_out_done -= runtime->buffer_size;
+
+	clear_bit(index, &line6pcm->active_urb_out);
+
+	for(i = LINE6_ISO_PACKETS; i--;)
+		if(urb->iso_frame_desc[i].status == -ESHUTDOWN) {
+			shutdown = 1;
+			break;
+		}
+
+	if(test_bit(index, &line6pcm->unlink_urb_out))
+		shutdown = 1;
+
+	spin_unlock_irqrestore(&line6pcm->lock_audio_out, flags);
+
+	if(!shutdown) {
+		submit_audio_out_urb(substream);
+
+		if((line6pcm->bytes_out += length) >= line6pcm->period_out) {
+			line6pcm->bytes_out -= line6pcm->period_out;
+			snd_pcm_period_elapsed(substream);
+		}
+	}
+}
+
+/* open playback callback */
+static int snd_line6_playback_open(struct snd_pcm_substream *substream)
+{
+	int err;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+
+	if((err = snd_pcm_hw_constraint_ratdens(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+																					(&line6pcm->properties->snd_line6_rates))) < 0)
+		return err;
+
+	runtime->hw = line6pcm->properties->snd_line6_playback_hw;
+	return 0;
+}
+
+/* close playback callback */
+static int snd_line6_playback_close(struct snd_pcm_substream *substream)
+{
+	return 0;
+}
+
+/* hw_params playback callback */
+static int snd_line6_playback_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params)
+{
+	int ret;
+	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+
+	/* -- Florian Demski [FD] */
+	/* don't ask me why, but this fixes the bug on my machine */
+	if ( line6pcm == NULL ) {
+		if ( substream->pcm == NULL )
+			return -ENOMEM;
+		if ( substream->pcm->private_data == NULL )
+			return -ENOMEM;
+		substream->private_data = substream->pcm->private_data;
+		line6pcm = snd_pcm_substream_chip( substream );
+	}
+	/* -- [FD] end */
+
+	if((ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
+		return ret;
+
+	line6pcm->period_out = params_period_bytes(hw_params);
+	line6pcm->wrap_out = kmalloc(2 * LINE6_ISO_PACKET_SIZE_MAX, GFP_KERNEL);
+
+	if(!line6pcm->wrap_out) {
+		dev_err(s2m(substream), "cannot malloc wrap_out\n");
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+/* hw_free playback callback */
+static int snd_line6_playback_hw_free(struct snd_pcm_substream *substream)
+{
+	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+	unlink_wait_clear_audio_out_urbs(line6pcm);
+
+	if(line6pcm->wrap_out) {
+		kfree(line6pcm->wrap_out);
+		line6pcm->wrap_out = 0;
+	}
+
+	return snd_pcm_lib_free_pages(substream);
+}
+
+/* trigger playback callback */
+int snd_line6_playback_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+	int err;
+	line6pcm->count_out = 0;
+
+	switch(cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		if(!test_and_set_bit(BIT_RUNNING_PLAYBACK, &line6pcm->flags)) {
+			err = submit_audio_out_all_urbs(substream);
+
+			if(err < 0) {
+				clear_bit(BIT_RUNNING_PLAYBACK, &line6pcm->flags);
+				return err;
+			}
+		}
+
+		break;
+
+	case SNDRV_PCM_TRIGGER_STOP:
+		if(test_and_clear_bit(BIT_RUNNING_PLAYBACK, &line6pcm->flags))
+			unlink_audio_out_urbs(line6pcm);
+
+		break;
+
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		set_bit(BIT_PAUSE_PLAYBACK, &line6pcm->flags);
+		break;
+
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		clear_bit(BIT_PAUSE_PLAYBACK, &line6pcm->flags);
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/* playback pointer callback */
+static snd_pcm_uframes_t
+snd_line6_playback_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
+	return line6pcm->pos_out_done;
+}
+
+/* playback operators */
+struct snd_pcm_ops snd_line6_playback_ops = {
+	.open =        snd_line6_playback_open,
+	.close =       snd_line6_playback_close,
+	.ioctl =       snd_pcm_lib_ioctl,
+	.hw_params =   snd_line6_playback_hw_params,
+	.hw_free =     snd_line6_playback_hw_free,
+	.prepare =     snd_line6_prepare,
+	.trigger =     snd_line6_trigger,
+	.pointer =     snd_line6_playback_pointer,
+};
+
+int create_audio_out_urbs(struct snd_line6_pcm *line6pcm)
+{
+	int i;
+
+	/* create audio URBs and fill in constant values: */
+	for(i = 0; i < LINE6_ISO_BUFFERS; ++i) {
+		struct urb *urb;
+
+		/* URB for audio out: */
+		urb = line6pcm->urb_audio_out[i] = usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
+
+		if(urb == NULL) {
+			dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
+			return -ENOMEM;
+		}
+
+		urb->dev = line6pcm->line6->usbdev;
+		urb->pipe = usb_sndisocpipe(line6pcm->line6->usbdev, line6pcm->ep_audio_write & USB_ENDPOINT_NUMBER_MASK);
+		urb->transfer_flags = URB_ISO_ASAP;
+		urb->start_frame = -1;
+		urb->number_of_packets = LINE6_ISO_PACKETS;
+		urb->interval = LINE6_ISO_INTERVAL;
+		urb->error_count = 0;
+		urb->complete = audio_out_callback;
+	}
+
+	return 0;
+}

drivers/staging/line6/playback.h

+/*
+ * 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 PLAYBACK_H
+#define PLAYBACK_H
+
+
+#include "driver.h"
+
+#include <sound/pcm.h>
+
+
+extern struct snd_pcm_ops snd_line6_playback_ops;
+
+
+extern int create_audio_out_urbs(struct snd_line6_pcm *line6pcm);
+extern int snd_line6_playback_trigger(struct snd_pcm_substream *substream, int cmd);
+extern void unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm);
+
+
+#endif

drivers/staging/line6/pod.h

+/*
+ * 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 POD_H
+#define POD_H
+
+
+#include "driver.h"
+
+#include <linux/spinlock.h>
+#include <linux/usb.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+
+#include <sound/core.h>
+
+#include "dumprequest.h"
+
+
+/*
+	PODxt Live interfaces
+*/
+#define PODXTLIVE_INTERFACE_POD    0
+#define PODXTLIVE_INTERFACE_VARIAX 1
+
+/*
+	Locate name in binary program dump
+*/
+#define	POD_NAME_OFFSET 0
+#define	POD_NAME_LENGTH 16
+
+/*
+	Other constants
+*/
+#define POD_CONTROL_SIZE 0x80
+#define POD_BUFSIZE_DUMPREQ 7
+#define POD_STARTUP_DELAY 3
+
+
+/**
+	 Data structure for values that need to be requested explicitly.
+	 This is the case for system and tuner settings.
+*/
+struct ValueWait
+{
+	unsigned short value;
+	wait_queue_head_t wait;
+};
+
+/**
+	 Binary PodXT Pro program dump
+*/
+struct pod_program {
+	/**
+		 Header information (including program name).
+	*/
+	unsigned char header[0x20];
+
+	/**
+		 Program parameters.
+	*/
+	unsigned char control[POD_CONTROL_SIZE];
+};
+
+struct usb_line6_pod {
+	/**
+		 Generic Line6 USB data.
+	*/
+	struct usb_line6 line6;
+
+	/**
+		 Dump request structure.
+	*/
+	struct line6_dump_request dumpreq;
+
+	/**
+		 Current program number.
+	*/
+	unsigned char channel_num;
+
+	/**
+		 Current program settings.
+	*/
+	struct pod_program prog_data;
+
+	/**
+		 Buffer for data retrieved from or to be stored on PODxt Pro.
+	*/
+	struct pod_program prog_data_buf;
+
+	/**
+		 Buffer for requesting version number.
+	*/
+	unsigned char *buffer_versionreq;
+
+	/**
+		 Tuner mute mode.
+	*/
+	struct ValueWait tuner_mute;
+
+	/**
+		 Tuner base frequency (typically 440Hz).
+	*/
+	struct ValueWait tuner_freq;
+
+	/**
+		 Note received from tuner.
+	*/
+	struct ValueWait tuner_note;
+
+	/**
+		 Pitch value received from tuner.
+	*/
+	struct ValueWait tuner_pitch;
+
+	/**
+		 Instrument monitor level.
+	*/
+	struct ValueWait monitor_level;
+
+	/**
+		 Audio routing mode.
+		 0: send processed guitar
+		 1: send clean guitar
+		 2: send clean guitar re-amp playback
+		 3: send re-amp playback
+	*/
+	struct ValueWait routing;
+
+	/**
+		 Wait for audio clipping event.
+	*/
+	struct ValueWait clipping;
+
+	/**
+		 Bottom-half for creation of sysfs special files.
+	*/
+	struct work_struct create_files_work;
+
+	/**
+		 Dirty flags for access to parameter data.
+	*/
+	unsigned long param_dirty[POD_CONTROL_SIZE / sizeof(unsigned long)];
+
+	/**
+		 Some atomic flags.
+	*/
+	unsigned long atomic_flags;
+
+	/**
+		 Counter for startup process.
+	*/
+	int startup_count;
+
+	/**
+		 Serial number of device.
+	*/
+	int serial_number;
+
+	/**
+		 Firmware version (x 100).
+	*/
+	int firmware_version;
+
+	/**
+		 Device ID.
+	*/
+	int device_id;
+
+	/**
+		 Flag to indicate modification of current program settings.
+	*/
+	char dirty;
+
+	/**
+		 Flag if initial firmware version request has been successful.
+	*/
+	char versionreq_ok;
+
+	/**
+		 Flag to enable MIDI postprocessing.
+	*/
+	char midi_postprocess;
+};
+
+
+extern void pod_disconnect(struct usb_interface *interface);
+extern int pod_init(struct usb_interface *interface, struct usb_line6_pod *pod);
+extern void pod_midi_postprocess(struct usb_line6_pod *pod, unsigned char *data, int length);
+extern void pod_process_message(struct usb_line6_pod *pod);
+extern void pod_receive_parameter(struct usb_line6_pod *pod, int param);
+extern void pod_transmit_parameter(struct usb_line6_pod *pod, int param, int value);
+
+
+#endif

drivers/staging/line6/revision.h

+#ifndef DRIVER_REVISION
+/* current subversion revision */
+#define DRIVER_REVISION " (revision 529)"
+#endif

drivers/staging/line6/toneport.h

+/*
+ * 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 TONEPORT_H
+#define TONEPORT_H
+
+
+#include "driver.h"
+
+#include <linux/usb.h>
+#include <sound/core.h>
+
+
+struct usb_line6_toneport {
+	/**
+		 Generic Line6 USB data.
+	*/
+	struct usb_line6 line6;
+
+	/**
+		 Serial number of device.
+	*/
+	int serial_number;
+
+	/**
+		 Firmware version (x 100).
+	*/
+	int firmware_version;
+};
+
+
+extern void toneport_disconnect(struct usb_interface *interface);
+extern int toneport_init(struct usb_interface *interface, struct usb_line6_toneport *toneport);
+
+
+#endif