[deliverable/linux.git] / sound / usb / line6 / pcm.c

/*
 * Line 6 Linux USB driver
 *
 * Copyright (C) 2004-2010 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 <linux/slab.h>
#include <linux/export.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>

#include "capture.h"
#include "driver.h"
#include "playback.h"

/* impulse response volume controls */
static int snd_line6_impulse_volume_info(struct snd_kcontrol *kcontrol,
					 struct snd_ctl_elem_info *uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = 255;
	return 0;
}

static int snd_line6_impulse_volume_get(struct snd_kcontrol *kcontrol,
					struct snd_ctl_elem_value *ucontrol)
{
	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);

	ucontrol->value.integer.value[0] = line6pcm->impulse_volume;
	return 0;
}

static int snd_line6_impulse_volume_put(struct snd_kcontrol *kcontrol,
					struct snd_ctl_elem_value *ucontrol)
{
	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
	int value = ucontrol->value.integer.value[0];

	if (line6pcm->impulse_volume == value)
		return 0;

	line6pcm->impulse_volume = value;
	if (value > 0)
		line6_pcm_acquire(line6pcm, LINE6_BITS_PCM_IMPULSE);
	else
		line6_pcm_release(line6pcm, LINE6_BITS_PCM_IMPULSE);
	return 1;
}

/* impulse response period controls */
static int snd_line6_impulse_period_info(struct snd_kcontrol *kcontrol,
					 struct snd_ctl_elem_info *uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = 2000;
	return 0;
}

static int snd_line6_impulse_period_get(struct snd_kcontrol *kcontrol,
					struct snd_ctl_elem_value *ucontrol)
{
	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);

	ucontrol->value.integer.value[0] = line6pcm->impulse_period;
	return 0;
}

static int snd_line6_impulse_period_put(struct snd_kcontrol *kcontrol,
					struct snd_ctl_elem_value *ucontrol)
{
	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
	int value = ucontrol->value.integer.value[0];

	if (line6pcm->impulse_period == value)
		return 0;

	line6pcm->impulse_period = value;
	return 1;
}

static bool test_flags(unsigned long flags0, unsigned long flags1,
		       unsigned long mask)
{
	return ((flags0 & mask) == 0) && ((flags1 & mask) != 0);
}

int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int channels)
{
	unsigned long flags_old, flags_new, flags_final;
	int err;

	do {
		flags_old = ACCESS_ONCE(line6pcm->flags);
		flags_new = flags_old | channels;
	} while (cmpxchg(&line6pcm->flags, flags_old, flags_new) != flags_old);

	flags_final = 0;

	line6pcm->prev_fbuf = NULL;

	if (test_flags(flags_old, flags_new, LINE6_BITS_CAPTURE_BUFFER)) {
		/* Invoked multiple times in a row so allocate once only */
		if (!line6pcm->buffer_in) {
			line6pcm->buffer_in =
				kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
					line6pcm->max_packet_size, GFP_KERNEL);
			if (!line6pcm->buffer_in) {
				err = -ENOMEM;
				goto pcm_acquire_error;
			}
		}

		flags_final |= channels & LINE6_BITS_CAPTURE_BUFFER;
	}

	if (test_flags(flags_old, flags_new, LINE6_BITS_CAPTURE_STREAM)) {
		/*
		   Waiting for completion of active URBs in the stop handler is
		   a bug, we therefore report an error if capturing is restarted
		   too soon.
		 */
		if (line6pcm->active_urb_in || line6pcm->unlink_urb_in) {
			dev_err(line6pcm->line6->ifcdev, "Device not yet ready\n");
			err = -EBUSY;
			goto pcm_acquire_error;
		}

		line6pcm->count_in = 0;
		line6pcm->prev_fsize = 0;
		err = line6_submit_audio_in_all_urbs(line6pcm);

		if (err < 0)
			goto pcm_acquire_error;

		flags_final |= channels & LINE6_BITS_CAPTURE_STREAM;
	}

	if (test_flags(flags_old, flags_new, LINE6_BITS_PLAYBACK_BUFFER)) {
		/* Invoked multiple times in a row so allocate once only */
		if (!line6pcm->buffer_out) {
			line6pcm->buffer_out =
				kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
					line6pcm->max_packet_size, GFP_KERNEL);
			if (!line6pcm->buffer_out) {
				err = -ENOMEM;
				goto pcm_acquire_error;
			}
		}

		flags_final |= channels & LINE6_BITS_PLAYBACK_BUFFER;
	}

	if (test_flags(flags_old, flags_new, LINE6_BITS_PLAYBACK_STREAM)) {
		/*
		  See comment above regarding PCM restart.
		*/
		if (line6pcm->active_urb_out || line6pcm->unlink_urb_out) {
			dev_err(line6pcm->line6->ifcdev, "Device not yet ready\n");
			return -EBUSY;
		}

		line6pcm->count_out = 0;
		err = line6_submit_audio_out_all_urbs(line6pcm);

		if (err < 0)
			goto pcm_acquire_error;

		flags_final |= channels & LINE6_BITS_PLAYBACK_STREAM;
	}

	return 0;

pcm_acquire_error:
	/*
	   If not all requested resources/streams could be obtained, release
	   those which were successfully obtained (if any).
	*/
	line6_pcm_release(line6pcm, flags_final);
	return err;
}
EXPORT_SYMBOL_GPL(line6_pcm_acquire);

int line6_pcm_release(struct snd_line6_pcm *line6pcm, int channels)
{
	unsigned long flags_old, flags_new;

	do {
		flags_old = ACCESS_ONCE(line6pcm->flags);
		flags_new = flags_old & ~channels;
	} while (cmpxchg(&line6pcm->flags, flags_old, flags_new) != flags_old);

	if (test_flags(flags_new, flags_old, LINE6_BITS_CAPTURE_STREAM))
		line6_unlink_audio_in_urbs(line6pcm);

	if (test_flags(flags_new, flags_old, LINE6_BITS_CAPTURE_BUFFER)) {
		line6_wait_clear_audio_in_urbs(line6pcm);
		line6_free_capture_buffer(line6pcm);
	}

	if (test_flags(flags_new, flags_old, LINE6_BITS_PLAYBACK_STREAM))
		line6_unlink_audio_out_urbs(line6pcm);

	if (test_flags(flags_new, flags_old, LINE6_BITS_PLAYBACK_BUFFER)) {
		line6_wait_clear_audio_out_urbs(line6pcm);
		line6_free_playback_buffer(line6pcm);
	}

	return 0;
}
EXPORT_SYMBOL_GPL(line6_pcm_release);

/* trigger callback */
int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	struct snd_pcm_substream *s;
	int err = 0;

	clear_bit(LINE6_INDEX_PREPARED, &line6pcm->flags);

	snd_pcm_group_for_each_entry(s, substream) {
		if (s->pcm->card != substream->pcm->card)
			continue;
		switch (s->stream) {
		case SNDRV_PCM_STREAM_PLAYBACK:
			err = snd_line6_playback_trigger(line6pcm, cmd);
			break;

		case SNDRV_PCM_STREAM_CAPTURE:
			err = snd_line6_capture_trigger(line6pcm, cmd);
			break;

		default:
			dev_err(line6pcm->line6->ifcdev,
				"Unknown stream direction %d\n", s->stream);
			err = -EINVAL;
			break;
		}
		if (err < 0)
			break;
	}

	return err;
}

/* control info callback */
static int snd_line6_control_playback_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_playback_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_playback[i];

	return 0;
}

/* control put callback */
static int snd_line6_control_playback_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_playback[i] !=
		    ucontrol->value.integer.value[i]) {
			line6pcm->volume_playback[i] =
			    ucontrol->value.integer.value[i];
			changed = 1;
		}

	return changed;
}

/* control definition */
static struct snd_kcontrol_new line6_controls[] = {
	{
		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
		.name = "PCM Playback Volume",
		.info = snd_line6_control_playback_info,
		.get = snd_line6_control_playback_get,
		.put = snd_line6_control_playback_put
	},
	{
		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
		.name = "Impulse Response Volume",
		.info = snd_line6_impulse_volume_info,
		.get = snd_line6_impulse_volume_get,
		.put = snd_line6_impulse_volume_put
	},
	{
		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
		.name = "Impulse Response Period",
		.info = snd_line6_impulse_period_info,
		.get = snd_line6_impulse_period_get,
		.put = snd_line6_impulse_period_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]);
		}
	}
	kfree(line6pcm);
}

/* create a PCM device */
static int snd_line6_new_pcm(struct usb_line6 *line6, struct snd_pcm **pcm_ret)
{
	struct snd_pcm *pcm;
	int err;

	err = snd_pcm_new(line6->card, (char *)line6->properties->name,
			  0, 1, 1, pcm_ret);
	if (err < 0)
		return err;
	pcm = *pcm_ret;
	strcpy(pcm->name, 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;
}

/*
	Sync with PCM stream stops.
*/
void line6_pcm_disconnect(struct snd_line6_pcm *line6pcm)
{
	line6_unlink_wait_clear_audio_out_urbs(line6pcm);
	line6_unlink_wait_clear_audio_in_urbs(line6pcm);
}

/*
	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)
{
	int i, err;
	unsigned ep_read = line6->properties->ep_audio_r;
	unsigned ep_write = line6->properties->ep_audio_w;
	struct snd_pcm *pcm;
	struct snd_line6_pcm *line6pcm;

	if (!(line6->properties->capabilities & LINE6_CAP_PCM))
		return 0;	/* skip PCM initialization and report success */

	err = snd_line6_new_pcm(line6, &pcm);
	if (err < 0)
		return err;

	line6pcm = kzalloc(sizeof(*line6pcm), GFP_KERNEL);
	if (!line6pcm)
		return -ENOMEM;

	line6pcm->pcm = pcm;
	line6pcm->properties = properties;
	line6pcm->volume_playback[0] = line6pcm->volume_playback[1] = 255;
	line6pcm->volume_monitor = 255;
	line6pcm->line6 = line6;

	/* Read and write buffers are sized identically, so choose minimum */
	line6pcm->max_packet_size = min(
			usb_maxpacket(line6->usbdev,
				usb_rcvisocpipe(line6->usbdev, ep_read), 0),
			usb_maxpacket(line6->usbdev,
				usb_sndisocpipe(line6->usbdev, ep_write), 1));

	spin_lock_init(&line6pcm->lock_audio_out);
	spin_lock_init(&line6pcm->lock_audio_in);
	line6pcm->impulse_period = LINE6_IMPULSE_DEFAULT_PERIOD;

	line6->line6pcm = line6pcm;

	pcm->private_data = line6pcm;
	pcm->private_free = line6_cleanup_pcm;

	err = line6_create_audio_out_urbs(line6pcm);
	if (err < 0)
		return err;

	err = line6_create_audio_in_urbs(line6pcm);
	if (err < 0)
		return err;

	/* mixer: */
	for (i = 0; i < ARRAY_SIZE(line6_controls); i++) {
		err = snd_ctl_add(line6->card,
				  snd_ctl_new1(&line6_controls[i], line6pcm));
		if (err < 0)
			return err;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(line6_init_pcm);

/* prepare pcm callback */
int snd_line6_prepare(struct snd_pcm_substream *substream)
{
	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);

	switch (substream->stream) {
	case SNDRV_PCM_STREAM_PLAYBACK:
		if ((line6pcm->flags & LINE6_BITS_PLAYBACK_STREAM) == 0)
			line6_unlink_wait_clear_audio_out_urbs(line6pcm);

		break;

	case SNDRV_PCM_STREAM_CAPTURE:
		if ((line6pcm->flags & LINE6_BITS_CAPTURE_STREAM) == 0)
			line6_unlink_wait_clear_audio_in_urbs(line6pcm);

		break;
	}

	if (!test_and_set_bit(LINE6_INDEX_PREPARED, &line6pcm->flags)) {
		line6pcm->count_out = 0;
		line6pcm->pos_out = 0;
		line6pcm->pos_out_done = 0;
		line6pcm->bytes_out = 0;
		line6pcm->count_in = 0;
		line6pcm->pos_in_done = 0;
		line6pcm->bytes_in = 0;
	}

	return 0;
}
Commit	Line	Data
	1	/*
	2	* Line 6 Linux USB driver
	3	*
	4	* Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License as
	8	* published by the Free Software Foundation, version 2.
	9	*
	10	*/
	11
	12	#include <linux/slab.h>
	13	#include <linux/export.h>
	14	#include <sound/core.h>
	15	#include <sound/control.h>
	16	#include <sound/pcm.h>
	17	#include <sound/pcm_params.h>
	18
	19	#include "capture.h"
	20	#include "driver.h"
	21	#include "playback.h"
	22
	23	/* impulse response volume controls */
	24	static int snd_line6_impulse_volume_info(struct snd_kcontrol *kcontrol,
	25	struct snd_ctl_elem_info *uinfo)
	26	{
	27	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	28	uinfo->count = 1;
	29	uinfo->value.integer.min = 0;
	30	uinfo->value.integer.max = 255;
	31	return 0;
	32	}
	33
	34	static int snd_line6_impulse_volume_get(struct snd_kcontrol *kcontrol,
	35	struct snd_ctl_elem_value *ucontrol)
	36	{
	37	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
	38
	39	ucontrol->value.integer.value[0] = line6pcm->impulse_volume;
	40	return 0;
	41	}
	42
	43	static int snd_line6_impulse_volume_put(struct snd_kcontrol *kcontrol,
	44	struct snd_ctl_elem_value *ucontrol)
	45	{
	46	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
	47	int value = ucontrol->value.integer.value[0];
	48
	49	if (line6pcm->impulse_volume == value)
	50	return 0;
	51
	52	line6pcm->impulse_volume = value;
	53	if (value > 0)
	54	line6_pcm_acquire(line6pcm, LINE6_BITS_PCM_IMPULSE);
	55	else
	56	line6_pcm_release(line6pcm, LINE6_BITS_PCM_IMPULSE);
	57	return 1;
	58	}
	59
	60	/* impulse response period controls */
	61	static int snd_line6_impulse_period_info(struct snd_kcontrol *kcontrol,
	62	struct snd_ctl_elem_info *uinfo)
	63	{
	64	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	65	uinfo->count = 1;
	66	uinfo->value.integer.min = 0;
	67	uinfo->value.integer.max = 2000;
	68	return 0;
	69	}
	70
	71	static int snd_line6_impulse_period_get(struct snd_kcontrol *kcontrol,
	72	struct snd_ctl_elem_value *ucontrol)
	73	{
	74	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
	75
	76	ucontrol->value.integer.value[0] = line6pcm->impulse_period;
	77	return 0;
	78	}
	79
	80	static int snd_line6_impulse_period_put(struct snd_kcontrol *kcontrol,
	81	struct snd_ctl_elem_value *ucontrol)
	82	{
	83	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
	84	int value = ucontrol->value.integer.value[0];
	85
	86	if (line6pcm->impulse_period == value)
	87	return 0;
	88
	89	line6pcm->impulse_period = value;
	90	return 1;
	91	}
	92
	93	static bool test_flags(unsigned long flags0, unsigned long flags1,
	94	unsigned long mask)
	95	{
	96	return ((flags0 & mask) == 0) && ((flags1 & mask) != 0);
	97	}
	98
	99	int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int channels)
	100	{
	101	unsigned long flags_old, flags_new, flags_final;
	102	int err;
	103
	104	do {
	105	flags_old = ACCESS_ONCE(line6pcm->flags);
	106	flags_new = flags_old \| channels;
	107	} while (cmpxchg(&line6pcm->flags, flags_old, flags_new) != flags_old);
	108
	109	flags_final = 0;
	110
	111	line6pcm->prev_fbuf = NULL;
	112
	113	if (test_flags(flags_old, flags_new, LINE6_BITS_CAPTURE_BUFFER)) {
	114	/* Invoked multiple times in a row so allocate once only */
	115	if (!line6pcm->buffer_in) {
	116	line6pcm->buffer_in =
	117	kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
	118	line6pcm->max_packet_size, GFP_KERNEL);
	119	if (!line6pcm->buffer_in) {
	120	err = -ENOMEM;
	121	goto pcm_acquire_error;
	122	}
	123	}
	124
	125	flags_final \|= channels & LINE6_BITS_CAPTURE_BUFFER;
	126	}
	127
	128	if (test_flags(flags_old, flags_new, LINE6_BITS_CAPTURE_STREAM)) {
	129	/*
	130	Waiting for completion of active URBs in the stop handler is
	131	a bug, we therefore report an error if capturing is restarted
	132	too soon.
	133	*/
	134	if (line6pcm->active_urb_in \|\| line6pcm->unlink_urb_in) {
	135	dev_err(line6pcm->line6->ifcdev, "Device not yet ready\n");
	136	err = -EBUSY;
	137	goto pcm_acquire_error;
	138	}
	139
	140	line6pcm->count_in = 0;
	141	line6pcm->prev_fsize = 0;
	142	err = line6_submit_audio_in_all_urbs(line6pcm);
	143
	144	if (err < 0)
	145	goto pcm_acquire_error;
	146
	147	flags_final \|= channels & LINE6_BITS_CAPTURE_STREAM;
	148	}
	149
	150	if (test_flags(flags_old, flags_new, LINE6_BITS_PLAYBACK_BUFFER)) {
	151	/* Invoked multiple times in a row so allocate once only */
	152	if (!line6pcm->buffer_out) {
	153	line6pcm->buffer_out =
	154	kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
	155	line6pcm->max_packet_size, GFP_KERNEL);
	156	if (!line6pcm->buffer_out) {
	157	err = -ENOMEM;
	158	goto pcm_acquire_error;
	159	}
	160	}
	161
	162	flags_final \|= channels & LINE6_BITS_PLAYBACK_BUFFER;
	163	}
	164
	165	if (test_flags(flags_old, flags_new, LINE6_BITS_PLAYBACK_STREAM)) {
	166	/*
	167	See comment above regarding PCM restart.
	168	*/
	169	if (line6pcm->active_urb_out \|\| line6pcm->unlink_urb_out) {
	170	dev_err(line6pcm->line6->ifcdev, "Device not yet ready\n");
	171	return -EBUSY;
	172	}
	173
	174	line6pcm->count_out = 0;
	175	err = line6_submit_audio_out_all_urbs(line6pcm);
	176
	177	if (err < 0)
	178	goto pcm_acquire_error;
	179
	180	flags_final \|= channels & LINE6_BITS_PLAYBACK_STREAM;
	181	}
	182
	183	return 0;
	184
	185	pcm_acquire_error:
	186	/*
	187	If not all requested resources/streams could be obtained, release
	188	those which were successfully obtained (if any).
	189	*/
	190	line6_pcm_release(line6pcm, flags_final);
	191	return err;
	192	}
	193	EXPORT_SYMBOL_GPL(line6_pcm_acquire);
	194
	195	int line6_pcm_release(struct snd_line6_pcm *line6pcm, int channels)
	196	{
	197	unsigned long flags_old, flags_new;
	198
	199	do {
	200	flags_old = ACCESS_ONCE(line6pcm->flags);
	201	flags_new = flags_old & ~channels;
	202	} while (cmpxchg(&line6pcm->flags, flags_old, flags_new) != flags_old);
	203
	204	if (test_flags(flags_new, flags_old, LINE6_BITS_CAPTURE_STREAM))
	205	line6_unlink_audio_in_urbs(line6pcm);
	206
	207	if (test_flags(flags_new, flags_old, LINE6_BITS_CAPTURE_BUFFER)) {
	208	line6_wait_clear_audio_in_urbs(line6pcm);
	209	line6_free_capture_buffer(line6pcm);
	210	}
	211
	212	if (test_flags(flags_new, flags_old, LINE6_BITS_PLAYBACK_STREAM))
	213	line6_unlink_audio_out_urbs(line6pcm);
	214
	215	if (test_flags(flags_new, flags_old, LINE6_BITS_PLAYBACK_BUFFER)) {
	216	line6_wait_clear_audio_out_urbs(line6pcm);
	217	line6_free_playback_buffer(line6pcm);
	218	}
	219
	220	return 0;
	221	}
	222	EXPORT_SYMBOL_GPL(line6_pcm_release);
	223
	224	/* trigger callback */
	225	int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd)
	226	{
	227	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	228	struct snd_pcm_substream *s;
	229	int err = 0;
	230
	231	clear_bit(LINE6_INDEX_PREPARED, &line6pcm->flags);
	232
	233	snd_pcm_group_for_each_entry(s, substream) {
	234	if (s->pcm->card != substream->pcm->card)
	235	continue;
	236	switch (s->stream) {
	237	case SNDRV_PCM_STREAM_PLAYBACK:
	238	err = snd_line6_playback_trigger(line6pcm, cmd);
	239	break;
	240
	241	case SNDRV_PCM_STREAM_CAPTURE:
	242	err = snd_line6_capture_trigger(line6pcm, cmd);
	243	break;
	244
	245	default:
	246	dev_err(line6pcm->line6->ifcdev,
	247	"Unknown stream direction %d\n", s->stream);
	248	err = -EINVAL;
	249	break;
	250	}
	251	if (err < 0)
	252	break;
	253	}
	254
	255	return err;
	256	}
	257
	258	/* control info callback */
	259	static int snd_line6_control_playback_info(struct snd_kcontrol *kcontrol,
	260	struct snd_ctl_elem_info *uinfo)
	261	{
	262	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	263	uinfo->count = 2;
	264	uinfo->value.integer.min = 0;
	265	uinfo->value.integer.max = 256;
	266	return 0;
	267	}
	268
	269	/* control get callback */
	270	static int snd_line6_control_playback_get(struct snd_kcontrol *kcontrol,
	271	struct snd_ctl_elem_value *ucontrol)
	272	{
	273	int i;
	274	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
	275
	276	for (i = 2; i--;)
	277	ucontrol->value.integer.value[i] = line6pcm->volume_playback[i];
	278
	279	return 0;
	280	}
	281
	282	/* control put callback */
	283	static int snd_line6_control_playback_put(struct snd_kcontrol *kcontrol,
	284	struct snd_ctl_elem_value *ucontrol)
	285	{
	286	int i, changed = 0;
	287	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
	288
	289	for (i = 2; i--;)
	290	if (line6pcm->volume_playback[i] !=
	291	ucontrol->value.integer.value[i]) {
	292	line6pcm->volume_playback[i] =
	293	ucontrol->value.integer.value[i];
	294	changed = 1;
	295	}
	296
	297	return changed;
	298	}
	299
	300	/* control definition */
	301	static struct snd_kcontrol_new line6_controls[] = {
	302	{
	303	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	304	.name = "PCM Playback Volume",
	305	.info = snd_line6_control_playback_info,
	306	.get = snd_line6_control_playback_get,
	307	.put = snd_line6_control_playback_put
	308	},
	309	{
	310	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	311	.name = "Impulse Response Volume",
	312	.info = snd_line6_impulse_volume_info,
	313	.get = snd_line6_impulse_volume_get,
	314	.put = snd_line6_impulse_volume_put
	315	},
	316	{
	317	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	318	.name = "Impulse Response Period",
	319	.info = snd_line6_impulse_period_info,
	320	.get = snd_line6_impulse_period_get,
	321	.put = snd_line6_impulse_period_put
	322	},
	323	};
	324
	325	/*
	326	Cleanup the PCM device.
	327	*/
	328	static void line6_cleanup_pcm(struct snd_pcm *pcm)
	329	{
	330	int i;
	331	struct snd_line6_pcm *line6pcm = snd_pcm_chip(pcm);
	332
	333	for (i = LINE6_ISO_BUFFERS; i--;) {
	334	if (line6pcm->urb_audio_out[i]) {
	335	usb_kill_urb(line6pcm->urb_audio_out[i]);
	336	usb_free_urb(line6pcm->urb_audio_out[i]);
	337	}
	338	if (line6pcm->urb_audio_in[i]) {
	339	usb_kill_urb(line6pcm->urb_audio_in[i]);
	340	usb_free_urb(line6pcm->urb_audio_in[i]);
	341	}
	342	}
	343	kfree(line6pcm);
	344	}
	345
	346	/* create a PCM device */
	347	static int snd_line6_new_pcm(struct usb_line6 line6, struct snd_pcm *pcm_ret)
	348	{
	349	struct snd_pcm *pcm;
	350	int err;
	351
	352	err = snd_pcm_new(line6->card, (char *)line6->properties->name,
	353	0, 1, 1, pcm_ret);
	354	if (err < 0)
	355	return err;
	356	pcm = *pcm_ret;
	357	strcpy(pcm->name, line6->properties->name);
	358
	359	/* set operators */
	360	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
	361	&snd_line6_playback_ops);
	362	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_line6_capture_ops);
	363
	364	/* pre-allocation of buffers */
	365	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
	366	snd_dma_continuous_data
	367	(GFP_KERNEL), 64 * 1024,
	368	128 * 1024);
	369	return 0;
	370	}
	371
	372	/*
	373	Sync with PCM stream stops.
	374	*/
	375	void line6_pcm_disconnect(struct snd_line6_pcm *line6pcm)
	376	{
	377	line6_unlink_wait_clear_audio_out_urbs(line6pcm);
	378	line6_unlink_wait_clear_audio_in_urbs(line6pcm);
	379	}
	380
	381	/*
	382	Create and register the PCM device and mixer entries.
	383	Create URBs for playback and capture.
	384	*/
	385	int line6_init_pcm(struct usb_line6 *line6,
	386	struct line6_pcm_properties *properties)
	387	{
	388	int i, err;
	389	unsigned ep_read = line6->properties->ep_audio_r;
	390	unsigned ep_write = line6->properties->ep_audio_w;
	391	struct snd_pcm *pcm;
	392	struct snd_line6_pcm *line6pcm;
	393
	394	if (!(line6->properties->capabilities & LINE6_CAP_PCM))
	395	return 0; /* skip PCM initialization and report success */
	396
	397	err = snd_line6_new_pcm(line6, &pcm);
	398	if (err < 0)
	399	return err;
	400
	401	line6pcm = kzalloc(sizeof(*line6pcm), GFP_KERNEL);
	402	if (!line6pcm)
	403	return -ENOMEM;
	404
	405	line6pcm->pcm = pcm;
	406	line6pcm->properties = properties;
	407	line6pcm->volume_playback[0] = line6pcm->volume_playback[1] = 255;
	408	line6pcm->volume_monitor = 255;
	409	line6pcm->line6 = line6;
	410
	411	/* Read and write buffers are sized identically, so choose minimum */
	412	line6pcm->max_packet_size = min(
	413	usb_maxpacket(line6->usbdev,
	414	usb_rcvisocpipe(line6->usbdev, ep_read), 0),
	415	usb_maxpacket(line6->usbdev,
	416	usb_sndisocpipe(line6->usbdev, ep_write), 1));
	417
	418	spin_lock_init(&line6pcm->lock_audio_out);
	419	spin_lock_init(&line6pcm->lock_audio_in);
	420	line6pcm->impulse_period = LINE6_IMPULSE_DEFAULT_PERIOD;
	421
	422	line6->line6pcm = line6pcm;
	423
	424	pcm->private_data = line6pcm;
	425	pcm->private_free = line6_cleanup_pcm;
	426
	427	err = line6_create_audio_out_urbs(line6pcm);
	428	if (err < 0)
	429	return err;
	430
	431	err = line6_create_audio_in_urbs(line6pcm);
	432	if (err < 0)
	433	return err;
	434
	435	/* mixer: */
	436	for (i = 0; i < ARRAY_SIZE(line6_controls); i++) {
	437	err = snd_ctl_add(line6->card,
	438	snd_ctl_new1(&line6_controls[i], line6pcm));
	439	if (err < 0)
	440	return err;
	441	}
	442
	443	return 0;
	444	}
	445	EXPORT_SYMBOL_GPL(line6_init_pcm);
	446
	447	/* prepare pcm callback */
	448	int snd_line6_prepare(struct snd_pcm_substream *substream)
	449	{
	450	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	451
	452	switch (substream->stream) {
	453	case SNDRV_PCM_STREAM_PLAYBACK:
	454	if ((line6pcm->flags & LINE6_BITS_PLAYBACK_STREAM) == 0)
	455	line6_unlink_wait_clear_audio_out_urbs(line6pcm);
	456
	457	break;
	458
	459	case SNDRV_PCM_STREAM_CAPTURE:
	460	if ((line6pcm->flags & LINE6_BITS_CAPTURE_STREAM) == 0)
	461	line6_unlink_wait_clear_audio_in_urbs(line6pcm);
	462
	463	break;
	464	}
	465
	466	if (!test_and_set_bit(LINE6_INDEX_PREPARED, &line6pcm->flags)) {
	467	line6pcm->count_out = 0;
	468	line6pcm->pos_out = 0;
	469	line6pcm->pos_out_done = 0;
	470	line6pcm->bytes_out = 0;
	471	line6pcm->count_in = 0;
	472	line6pcm->pos_in_done = 0;
	473	line6pcm->bytes_in = 0;
	474	}
	475
	476	return 0;
	477	}