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, 289 insertions, 0 deletions

diff --git a/drivers/staging/line6/pcm.c b/drivers/staging/line6/pcm.c
new file mode 100644
index 00000000000..725184b2f30
--- /dev/null
+++ b/drivers/staging/line6/pcm.c
@@ -0,0 +1,289 @@
+/*
+ * 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;
+}