[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];
	int err;

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

	line6pcm->impulse_volume = value;
	if (value > 0) {
		err = line6_pcm_acquire(line6pcm, LINE6_STREAM_IMPULSE);
		if (err < 0) {
			line6pcm->impulse_volume = 0;
			line6_pcm_release(line6pcm, LINE6_STREAM_IMPULSE);
			return err;
		}
	} else {
		line6_pcm_release(line6pcm, LINE6_STREAM_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;
}

/*
	Unlink all currently active URBs.
*/
static void line6_unlink_audio_urbs(struct snd_line6_pcm *line6pcm,
				    struct line6_pcm_stream *pcms)
{
	int i;

	for (i = 0; i < LINE6_ISO_BUFFERS; i++) {
		if (test_bit(i, &pcms->active_urbs)) {
			if (!test_and_set_bit(i, &pcms->unlink_urbs))
				usb_unlink_urb(pcms->urbs[i]);
		}
	}
}

/*
	Wait until unlinking of all currently active URBs has been finished.
*/
static void line6_wait_clear_audio_urbs(struct snd_line6_pcm *line6pcm,
					struct line6_pcm_stream *pcms)
{
	int timeout = HZ;
	int i;
	int alive;

	do {
		alive = 0;
		for (i = 0; i < LINE6_ISO_BUFFERS; i++) {
			if (test_bit(i, &pcms->active_urbs))
				alive++;
		}
		if (!alive)
			break;
		set_current_state(TASK_UNINTERRUPTIBLE);
		schedule_timeout(1);
	} while (--timeout > 0);
	if (alive)
		dev_err(line6pcm->line6->ifcdev,
			"timeout: still %d active urbs..\n", alive);
}

static inline struct line6_pcm_stream *
get_stream(struct snd_line6_pcm *line6pcm, int direction)
{
	return (direction == SNDRV_PCM_STREAM_PLAYBACK) ?
		&line6pcm->out : &line6pcm->in;
}

/* allocate a buffer if not opened yet;
 * call this in line6pcm.state_change mutex
 */
static int line6_buffer_acquire(struct snd_line6_pcm *line6pcm,
				struct line6_pcm_stream *pstr, int type)
{
	/* Invoked multiple times in a row so allocate once only */
	if (!test_and_set_bit(type, &pstr->opened) && !pstr->buffer) {
		pstr->buffer = kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
				       line6pcm->max_packet_size, GFP_KERNEL);
		if (!pstr->buffer)
			return -ENOMEM;
	}
	return 0;
}

/* free a buffer if all streams are closed;
 * call this in line6pcm.state_change mutex
 */
static void line6_buffer_release(struct snd_line6_pcm *line6pcm,
				 struct line6_pcm_stream *pstr, int type)
{

	clear_bit(type, &pstr->opened);
	if (!pstr->opened) {
		line6_wait_clear_audio_urbs(line6pcm, pstr);
		kfree(pstr->buffer);
		pstr->buffer = NULL;
	}
}

/* start a PCM stream */
static int line6_stream_start(struct snd_line6_pcm *line6pcm, int direction,
			      int type)
{
	unsigned long flags;
	struct line6_pcm_stream *pstr = get_stream(line6pcm, direction);
	int ret = 0;

	spin_lock_irqsave(&pstr->lock, flags);
	if (!test_and_set_bit(type, &pstr->running) &&
	    !(pstr->active_urbs || pstr->unlink_urbs)) {
		pstr->count = 0;
		/* Submit all currently available URBs */
		if (direction == SNDRV_PCM_STREAM_PLAYBACK)
			ret = line6_submit_audio_out_all_urbs(line6pcm);
		else
			ret = line6_submit_audio_in_all_urbs(line6pcm);
	}
	if (ret < 0)
		clear_bit(type, &pstr->running);
	spin_unlock_irqrestore(&pstr->lock, flags);
	return ret;
}

/* stop a PCM stream; this doesn't sync with the unlinked URBs */
static void line6_stream_stop(struct snd_line6_pcm *line6pcm, int direction,
			  int type)
{
	unsigned long flags;
	struct line6_pcm_stream *pstr = get_stream(line6pcm, direction);

	spin_lock_irqsave(&pstr->lock, flags);
	clear_bit(type, &pstr->running);
	if (!pstr->running) {
		line6_unlink_audio_urbs(line6pcm, pstr);
		if (direction == SNDRV_PCM_STREAM_CAPTURE) {
			line6pcm->prev_fbuf = NULL;
			line6pcm->prev_fsize = 0;
		}
	}
	spin_unlock_irqrestore(&pstr->lock, flags);
}

/* common PCM 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;

	clear_bit(LINE6_FLAG_PREPARED, &line6pcm->flags);

	snd_pcm_group_for_each_entry(s, substream) {
		if (s->pcm->card != substream->pcm->card)
			continue;

		switch (cmd) {
		case SNDRV_PCM_TRIGGER_START:
		case SNDRV_PCM_TRIGGER_RESUME:
			err = line6_stream_start(line6pcm, s->stream,
						 LINE6_STREAM_PCM);
			if (err < 0)
				return err;
			break;

		case SNDRV_PCM_TRIGGER_STOP:
		case SNDRV_PCM_TRIGGER_SUSPEND:
			line6_stream_stop(line6pcm, s->stream,
					  LINE6_STREAM_PCM);
			break;

		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
			if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
				return -EINVAL;
			set_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags);
			break;

		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
			if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
				return -EINVAL;
			clear_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags);
			break;

		default:
			return -EINVAL;
		}
	}

	return 0;
}

/* common PCM pointer callback */
snd_pcm_uframes_t snd_line6_pointer(struct snd_pcm_substream *substream)
{
	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);

	return pstr->pos_done;
}

/* Acquire and start duplex streams:
 * type is either LINE6_STREAM_IMPULSE or LINE6_STREAM_MONITOR
 */
int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int type)
{
	struct line6_pcm_stream *pstr;
	int ret = 0, dir;

	mutex_lock(&line6pcm->state_mutex);
	for (dir = 0; dir < 2; dir++) {
		pstr = get_stream(line6pcm, dir);
		ret = line6_buffer_acquire(line6pcm, pstr, type);
		if (ret < 0)
			goto error;
		if (!pstr->running)
			line6_wait_clear_audio_urbs(line6pcm, pstr);
	}
	for (dir = 0; dir < 2; dir++) {
		ret = line6_stream_start(line6pcm, dir, type);
		if (ret < 0)
			goto error;
	}
 error:
	mutex_unlock(&line6pcm->state_mutex);
	if (ret < 0)
		line6_pcm_release(line6pcm, type);
	return ret;
}
EXPORT_SYMBOL_GPL(line6_pcm_acquire);

/* Stop and release duplex streams */
void line6_pcm_release(struct snd_line6_pcm *line6pcm, int type)
{
	struct line6_pcm_stream *pstr;
	int dir;

	mutex_lock(&line6pcm->state_mutex);
	for (dir = 0; dir < 2; dir++)
		line6_stream_stop(line6pcm, dir, type);
	for (dir = 0; dir < 2; dir++) {
		pstr = get_stream(line6pcm, dir);
		line6_buffer_release(line6pcm, pstr, type);
	}
	mutex_unlock(&line6pcm->state_mutex);
}
EXPORT_SYMBOL_GPL(line6_pcm_release);

/* common PCM hw_params callback */
int snd_line6_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);
	struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);

	mutex_lock(&line6pcm->state_mutex);
	ret = line6_buffer_acquire(line6pcm, pstr, LINE6_STREAM_PCM);
	if (ret < 0)
		goto error;

	ret = snd_pcm_lib_malloc_pages(substream,
				       params_buffer_bytes(hw_params));
	if (ret < 0) {
		line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM);
		goto error;
	}

	pstr->period = params_period_bytes(hw_params);
 error:
	mutex_unlock(&line6pcm->state_mutex);
	return ret;
}

/* common PCM hw_free callback */
int snd_line6_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);

	mutex_lock(&line6pcm->state_mutex);
	line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM);
	mutex_unlock(&line6pcm->state_mutex);
	return snd_pcm_lib_free_pages(substream);
}


/* 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 = 0; 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 = 0; 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 cleanup_urbs(struct line6_pcm_stream *pcms)
{
	int i;

	for (i = 0; i < LINE6_ISO_BUFFERS; i++) {
		if (pcms->urbs[i]) {
			usb_kill_urb(pcms->urbs[i]);
			usb_free_urb(pcms->urbs[i]);
		}
	}
}

static void line6_cleanup_pcm(struct snd_pcm *pcm)
{
	struct snd_line6_pcm *line6pcm = snd_pcm_chip(pcm);

	cleanup_urbs(&line6pcm->out);
	cleanup_urbs(&line6pcm->in);
	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_audio_urbs(line6pcm, &line6pcm->out);
	line6_unlink_audio_urbs(line6pcm, &line6pcm->in);
	line6_wait_clear_audio_urbs(line6pcm, &line6pcm->out);
	line6_wait_clear_audio_urbs(line6pcm, &line6pcm->in);
}

/*
	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;

	mutex_init(&line6pcm->state_mutex);
	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->out.lock);
	spin_lock_init(&line6pcm->in.lock);
	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);
	struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);

	mutex_lock(&line6pcm->state_mutex);
	if (!pstr->running)
		line6_wait_clear_audio_urbs(line6pcm, pstr);

	if (!test_and_set_bit(LINE6_FLAG_PREPARED, &line6pcm->flags)) {
		line6pcm->out.count = 0;
		line6pcm->out.pos = 0;
		line6pcm->out.pos_done = 0;
		line6pcm->out.bytes = 0;
		line6pcm->in.count = 0;
		line6pcm->in.pos_done = 0;
		line6pcm->in.bytes = 0;
	}

	mutex_unlock(&line6pcm->state_mutex);
	return 0;
}
Commit	Line	Data
705ececd	1	/*
c078a4aa	2	* Line 6 Linux USB driver
705ececd	3	*
1027f476	4	* Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
705ececd MG	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
5a0e3ad6	12	#include <linux/slab.h>
ccddbe4a	13	#include <linux/export.h>
705ececd MG	14	#include <sound/core.h>
	15	#include <sound/control.h>
	16	#include <sound/pcm.h>
	17	#include <sound/pcm_params.h>
	18
705ececd	19	#include "capture.h"
1027f476	20	#include "driver.h"
705ececd	21	#include "playback.h"
705ececd	22
075587b7 TI	23	/* impulse response volume controls */
	24	static int snd_line6_impulse_volume_info(struct snd_kcontrol *kcontrol,
	25	struct snd_ctl_elem_info *uinfo)
1027f476	26	{
075587b7 TI	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;
1027f476 MG	32	}
1027f476 MG	33
075587b7 TI	34	static int snd_line6_impulse_volume_get(struct snd_kcontrol *kcontrol,
075587b7 TI	35	struct snd_ctl_elem_value *ucontrol)
1027f476	36	{
075587b7 TI	37	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
	38
	39	ucontrol->value.integer.value[0] = line6pcm->impulse_volume;
	40	return 0;
1027f476 MG	41	}
1027f476 MG	42
075587b7 TI	43	static int snd_line6_impulse_volume_put(struct snd_kcontrol *kcontrol,
075587b7 TI	44	struct snd_ctl_elem_value *ucontrol)
1027f476	45	{
075587b7 TI	46	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
075587b7 TI	47	int value = ucontrol->value.integer.value[0];
247d95ee	48	int err;
cdf5e551	49
075587b7 TI	50	if (line6pcm->impulse_volume == value)
075587b7 TI	51	return 0;
cdf5e551	52
1027f476	53	line6pcm->impulse_volume = value;
247d95ee TI	54	if (value > 0) {
	55	err = line6_pcm_acquire(line6pcm, LINE6_STREAM_IMPULSE);
	56	if (err < 0) {
	57	line6pcm->impulse_volume = 0;
	58	line6_pcm_release(line6pcm, LINE6_STREAM_IMPULSE);
	59	return err;
	60	}
	61	} else {
63e20df1	62	line6_pcm_release(line6pcm, LINE6_STREAM_IMPULSE);
247d95ee	63	}
075587b7 TI	64	return 1;
075587b7 TI	65	}
1027f476	66
075587b7 TI	67	/* impulse response period controls */
	68	static int snd_line6_impulse_period_info(struct snd_kcontrol *kcontrol,
	69	struct snd_ctl_elem_info *uinfo)
	70	{
	71	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	72	uinfo->count = 1;
	73	uinfo->value.integer.min = 0;
	74	uinfo->value.integer.max = 2000;
	75	return 0;
1027f476 MG	76	}
1027f476 MG	77
075587b7 TI	78	static int snd_line6_impulse_period_get(struct snd_kcontrol *kcontrol,
075587b7 TI	79	struct snd_ctl_elem_value *ucontrol)
1027f476	80	{
075587b7 TI	81	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
	82
	83	ucontrol->value.integer.value[0] = line6pcm->impulse_period;
	84	return 0;
1027f476 MG	85	}
1027f476 MG	86
075587b7 TI	87	static int snd_line6_impulse_period_put(struct snd_kcontrol *kcontrol,
075587b7 TI	88	struct snd_ctl_elem_value *ucontrol)
1027f476	89	{
075587b7 TI	90	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
075587b7 TI	91	int value = ucontrol->value.integer.value[0];
a3762902	92
075587b7 TI	93	if (line6pcm->impulse_period == value)
075587b7 TI	94	return 0;
a3762902	95
075587b7 TI	96	line6pcm->impulse_period = value;
075587b7 TI	97	return 1;
1027f476	98	}
1027f476	99
d8131e67 TI	100	/*
	101	Unlink all currently active URBs.
	102	*/
	103	static void line6_unlink_audio_urbs(struct snd_line6_pcm *line6pcm,
	104	struct line6_pcm_stream *pcms)
	105	{
	106	int i;
	107
	108	for (i = 0; i < LINE6_ISO_BUFFERS; i++) {
	109	if (test_bit(i, &pcms->active_urbs)) {
	110	if (!test_and_set_bit(i, &pcms->unlink_urbs))
	111	usb_unlink_urb(pcms->urbs[i]);
	112	}
	113	}
	114	}
	115
	116	/*
	117	Wait until unlinking of all currently active URBs has been finished.
	118	*/
	119	static void line6_wait_clear_audio_urbs(struct snd_line6_pcm *line6pcm,
	120	struct line6_pcm_stream *pcms)
	121	{
	122	int timeout = HZ;
	123	int i;
	124	int alive;
	125
	126	do {
	127	alive = 0;
	128	for (i = 0; i < LINE6_ISO_BUFFERS; i++) {
	129	if (test_bit(i, &pcms->active_urbs))
	130	alive++;
	131	}
	132	if (!alive)
	133	break;
	134	set_current_state(TASK_UNINTERRUPTIBLE);
	135	schedule_timeout(1);
	136	} while (--timeout > 0);
	137	if (alive)
ccaac9ed TI	138	dev_err(line6pcm->line6->ifcdev,
ccaac9ed TI	139	"timeout: still %d active urbs..\n", alive);
d8131e67 TI	140	}
d8131e67 TI	141
63e20df1 TI	142	static inline struct line6_pcm_stream *
63e20df1 TI	143	get_stream(struct snd_line6_pcm *line6pcm, int direction)
e90576c5	144	{
63e20df1 TI	145	return (direction == SNDRV_PCM_STREAM_PLAYBACK) ?
63e20df1 TI	146	&line6pcm->out : &line6pcm->in;
e90576c5 TI	147	}
e90576c5 TI	148
63e20df1 TI	149	/* allocate a buffer if not opened yet;
	150	* call this in line6pcm.state_change mutex
	151	*/
	152	static int line6_buffer_acquire(struct snd_line6_pcm *line6pcm,
	153	struct line6_pcm_stream *pstr, int type)
e90576c5	154	{
63e20df1 TI	155	/* Invoked multiple times in a row so allocate once only */
	156	if (!test_and_set_bit(type, &pstr->opened) && !pstr->buffer) {
	157	pstr->buffer = kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
	158	line6pcm->max_packet_size, GFP_KERNEL);
	159	if (!pstr->buffer)
	160	return -ENOMEM;
	161	}
	162	return 0;
e90576c5 TI	163	}
e90576c5 TI	164
63e20df1 TI	165	/* free a buffer if all streams are closed;
	166	* call this in line6pcm.state_change mutex
	167	*/
	168	static void line6_buffer_release(struct snd_line6_pcm *line6pcm,
	169	struct line6_pcm_stream *pstr, int type)
6b02a17e	170	{
63e20df1 TI	171
	172	clear_bit(type, &pstr->opened);
	173	if (!pstr->opened) {
	174	line6_wait_clear_audio_urbs(line6pcm, pstr);
	175	kfree(pstr->buffer);
	176	pstr->buffer = NULL;
	177	}
6b02a17e MG	178	}
6b02a17e MG	179
63e20df1 TI	180	/* start a PCM stream */
	181	static int line6_stream_start(struct snd_line6_pcm *line6pcm, int direction,
	182	int type)
1027f476	183	{
63e20df1 TI	184	unsigned long flags;
	185	struct line6_pcm_stream *pstr = get_stream(line6pcm, direction);
	186	int ret = 0;
	187
	188	spin_lock_irqsave(&pstr->lock, flags);
4d0e6775 TI	189	if (!test_and_set_bit(type, &pstr->running) &&
4d0e6775 TI	190	!(pstr->active_urbs \|\| pstr->unlink_urbs)) {
63e20df1 TI	191	pstr->count = 0;
	192	/* Submit all currently available URBs */
	193	if (direction == SNDRV_PCM_STREAM_PLAYBACK)
	194	ret = line6_submit_audio_out_all_urbs(line6pcm);
	195	else
	196	ret = line6_submit_audio_in_all_urbs(line6pcm);
0ca54888	197	}
63e20df1 TI	198	if (ret < 0)
	199	clear_bit(type, &pstr->running);
	200	spin_unlock_irqrestore(&pstr->lock, flags);
	201	return ret;
	202	}
0ca54888	203
63e20df1 TI	204	/* stop a PCM stream; this doesn't sync with the unlinked URBs */
	205	static void line6_stream_stop(struct snd_line6_pcm *line6pcm, int direction,
	206	int type)
	207	{
	208	unsigned long flags;
	209	struct line6_pcm_stream *pstr = get_stream(line6pcm, direction);
	210
	211	spin_lock_irqsave(&pstr->lock, flags);
	212	clear_bit(type, &pstr->running);
	213	if (!pstr->running) {
	214	line6_unlink_audio_urbs(line6pcm, pstr);
	215	if (direction == SNDRV_PCM_STREAM_CAPTURE) {
	216	line6pcm->prev_fbuf = NULL;
	217	line6pcm->prev_fsize = 0;
6b02a17e	218	}
63e20df1 TI	219	}
	220	spin_unlock_irqrestore(&pstr->lock, flags);
	221	}
6b02a17e	222
63e20df1 TI	223	/* common PCM trigger callback */
	224	int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd)
	225	{
	226	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	227	struct snd_pcm_substream *s;
	228	int err;
e1a164d7	229
63e20df1	230	clear_bit(LINE6_FLAG_PREPARED, &line6pcm->flags);
0ca54888	231
63e20df1 TI	232	snd_pcm_group_for_each_entry(s, substream) {
	233	if (s->pcm->card != substream->pcm->card)
	234	continue;
e1a164d7	235
63e20df1 TI	236	switch (cmd) {
	237	case SNDRV_PCM_TRIGGER_START:
	238	case SNDRV_PCM_TRIGGER_RESUME:
	239	err = line6_stream_start(line6pcm, s->stream,
	240	LINE6_STREAM_PCM);
	241	if (err < 0)
	242	return err;
	243	break;
6b02a17e	244
63e20df1 TI	245	case SNDRV_PCM_TRIGGER_STOP:
	246	case SNDRV_PCM_TRIGGER_SUSPEND:
	247	line6_stream_stop(line6pcm, s->stream,
	248	LINE6_STREAM_PCM);
	249	break;
6b02a17e	250
63e20df1 TI	251	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	252	if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
	253	return -EINVAL;
	254	set_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags);
	255	break;
e1a164d7	256
63e20df1 TI	257	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	258	if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
	259	return -EINVAL;
	260	clear_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags);
	261	break;
0ca54888	262
63e20df1 TI	263	default:
	264	return -EINVAL;
	265	}
1027f476	266	}
e1a164d7	267
1027f476 MG	268	return 0;
	269	}
	270
2954f914 TI	271	/* common PCM pointer callback */
	272	snd_pcm_uframes_t snd_line6_pointer(struct snd_pcm_substream *substream)
	273	{
	274	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	275	struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
	276
	277	return pstr->pos_done;
	278	}
	279
63e20df1 TI	280	/* Acquire and start duplex streams:
	281	* type is either LINE6_STREAM_IMPULSE or LINE6_STREAM_MONITOR
	282	*/
	283	int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int type)
1027f476	284	{
63e20df1 TI	285	struct line6_pcm_stream *pstr;
	286	int ret = 0, dir;
	287
	288	mutex_lock(&line6pcm->state_mutex);
	289	for (dir = 0; dir < 2; dir++) {
	290	pstr = get_stream(line6pcm, dir);
	291	ret = line6_buffer_acquire(line6pcm, pstr, type);
	292	if (ret < 0)
	293	goto error;
	294	if (!pstr->running)
	295	line6_wait_clear_audio_urbs(line6pcm, pstr);
f2bb614b	296	}
63e20df1 TI	297	for (dir = 0; dir < 2; dir++) {
	298	ret = line6_stream_start(line6pcm, dir, type);
	299	if (ret < 0)
	300	goto error;
1027f476	301	}
63e20df1 TI	302	error:
	303	mutex_unlock(&line6pcm->state_mutex);
	304	if (ret < 0)
	305	line6_pcm_release(line6pcm, type);
	306	return ret;
	307	}
	308	EXPORT_SYMBOL_GPL(line6_pcm_acquire);
1027f476	309
63e20df1 TI	310	/* Stop and release duplex streams */
	311	void line6_pcm_release(struct snd_line6_pcm *line6pcm, int type)
	312	{
	313	struct line6_pcm_stream *pstr;
	314	int dir;
	315
	316	mutex_lock(&line6pcm->state_mutex);
	317	for (dir = 0; dir < 2; dir++)
	318	line6_stream_stop(line6pcm, dir, type);
	319	for (dir = 0; dir < 2; dir++) {
	320	pstr = get_stream(line6pcm, dir);
	321	line6_buffer_release(line6pcm, pstr, type);
1027f476	322	}
63e20df1	323	mutex_unlock(&line6pcm->state_mutex);
1027f476	324	}
ccddbe4a	325	EXPORT_SYMBOL_GPL(line6_pcm_release);
1027f476	326
63e20df1 TI	327	/* common PCM hw_params callback */
	328	int snd_line6_hw_params(struct snd_pcm_substream *substream,
	329	struct snd_pcm_hw_params *hw_params)
705ececd	330	{
63e20df1	331	int ret;
705ececd	332	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
63e20df1 TI	333	struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
	334
	335	mutex_lock(&line6pcm->state_mutex);
	336	ret = line6_buffer_acquire(line6pcm, pstr, LINE6_STREAM_PCM);
	337	if (ret < 0)
	338	goto error;
	339
	340	ret = snd_pcm_lib_malloc_pages(substream,
	341	params_buffer_bytes(hw_params));
	342	if (ret < 0) {
	343	line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM);
	344	goto error;
	345	}
705ececd	346
63e20df1 TI	347	pstr->period = params_period_bytes(hw_params);
	348	error:
	349	mutex_unlock(&line6pcm->state_mutex);
	350	return ret;
	351	}
705ececd	352
63e20df1 TI	353	/* common PCM hw_free callback */
	354	int snd_line6_hw_free(struct snd_pcm_substream *substream)
	355	{
	356	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	357	struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
705ececd	358
63e20df1 TI	359	mutex_lock(&line6pcm->state_mutex);
	360	line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM);
	361	mutex_unlock(&line6pcm->state_mutex);
	362	return snd_pcm_lib_free_pages(substream);
705ececd MG	363	}
705ececd MG	364
63e20df1	365
705ececd	366	/* control info callback */
1027f476 MG	367	static int snd_line6_control_playback_info(struct snd_kcontrol *kcontrol,
1027f476 MG	368	struct snd_ctl_elem_info *uinfo)
68dc3dde	369	{
705ececd MG	370	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	371	uinfo->count = 2;
	372	uinfo->value.integer.min = 0;
	373	uinfo->value.integer.max = 256;
	374	return 0;
	375	}
	376
	377	/* control get callback */
1027f476 MG	378	static int snd_line6_control_playback_get(struct snd_kcontrol *kcontrol,
1027f476 MG	379	struct snd_ctl_elem_value *ucontrol)
68dc3dde	380	{
705ececd MG	381	int i;
	382	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
	383
9fb754b7	384	for (i = 0; i < 2; i++)
1027f476	385	ucontrol->value.integer.value[i] = line6pcm->volume_playback[i];
705ececd MG	386
	387	return 0;
	388	}
	389
	390	/* control put callback */
1027f476 MG	391	static int snd_line6_control_playback_put(struct snd_kcontrol *kcontrol,
1027f476 MG	392	struct snd_ctl_elem_value *ucontrol)
68dc3dde	393	{
705ececd MG	394	int i, changed = 0;
	395	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
	396
9fb754b7	397	for (i = 0; i < 2; i++)
e1a164d7 MG	398	if (line6pcm->volume_playback[i] !=
	399	ucontrol->value.integer.value[i]) {
	400	line6pcm->volume_playback[i] =
	401	ucontrol->value.integer.value[i];
705ececd MG	402	changed = 1;
	403	}
	404
	405	return changed;
	406	}
	407
	408	/* control definition */
075587b7 TI	409	static struct snd_kcontrol_new line6_controls[] = {
	410	{
	411	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	412	.name = "PCM Playback Volume",
	413	.info = snd_line6_control_playback_info,
	414	.get = snd_line6_control_playback_get,
	415	.put = snd_line6_control_playback_put
	416	},
	417	{
	418	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	419	.name = "Impulse Response Volume",
	420	.info = snd_line6_impulse_volume_info,
	421	.get = snd_line6_impulse_volume_get,
	422	.put = snd_line6_impulse_volume_put
	423	},
	424	{
	425	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	426	.name = "Impulse Response Period",
	427	.info = snd_line6_impulse_period_info,
	428	.get = snd_line6_impulse_period_get,
	429	.put = snd_line6_impulse_period_put
	430	},
705ececd MG	431	};
	432
	433	/*
	434	Cleanup the PCM device.
	435	*/
d8131e67	436	static void cleanup_urbs(struct line6_pcm_stream *pcms)
705ececd MG	437	{
705ececd MG	438	int i;
705ececd	439
9fb754b7	440	for (i = 0; i < LINE6_ISO_BUFFERS; i++) {
d8131e67 TI	441	if (pcms->urbs[i]) {
	442	usb_kill_urb(pcms->urbs[i]);
	443	usb_free_urb(pcms->urbs[i]);
705ececd MG	444	}
705ececd MG	445	}
d8131e67 TI	446	}
	447
	448	static void line6_cleanup_pcm(struct snd_pcm *pcm)
	449	{
	450	struct snd_line6_pcm *line6pcm = snd_pcm_chip(pcm);
	451
	452	cleanup_urbs(&line6pcm->out);
	453	cleanup_urbs(&line6pcm->in);
b45a7c56	454	kfree(line6pcm);
705ececd MG	455	}
	456
	457	/* create a PCM device */
b45a7c56	458	static int snd_line6_new_pcm(struct usb_line6 line6, struct snd_pcm *pcm_ret)
705ececd MG	459	{
	460	struct snd_pcm *pcm;
	461	int err;
	462
b45a7c56 TI	463	err = snd_pcm_new(line6->card, (char *)line6->properties->name,
b45a7c56 TI	464	0, 1, 1, pcm_ret);
68dc3dde	465	if (err < 0)
705ececd	466	return err;
b45a7c56 TI	467	pcm = *pcm_ret;
b45a7c56 TI	468	strcpy(pcm->name, line6->properties->name);
705ececd MG	469
705ececd MG	470	/* set operators */
afb9091d SB	471	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
afb9091d SB	472	&snd_line6_playback_ops);
e1a164d7	473	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_line6_capture_ops);
705ececd MG	474
705ececd MG	475	/* pre-allocation of buffers */
68dc3dde	476	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
e1a164d7 MG	477	snd_dma_continuous_data
	478	(GFP_KERNEL), 64 * 1024,
	479	128 * 1024);
705ececd MG	480	return 0;
	481	}
	482
1027f476	483	/*
5a475311	484	Sync with PCM stream stops.
1027f476 MG	485	*/
	486	void line6_pcm_disconnect(struct snd_line6_pcm *line6pcm)
	487	{
d8131e67 TI	488	line6_unlink_audio_urbs(line6pcm, &line6pcm->out);
	489	line6_unlink_audio_urbs(line6pcm, &line6pcm->in);
	490	line6_wait_clear_audio_urbs(line6pcm, &line6pcm->out);
	491	line6_wait_clear_audio_urbs(line6pcm, &line6pcm->in);
1027f476 MG	492	}
1027f476 MG	493
705ececd MG	494	/*
	495	Create and register the PCM device and mixer entries.
	496	Create URBs for playback and capture.
	497	*/
68dc3dde GKH	498	int line6_init_pcm(struct usb_line6 *line6,
68dc3dde GKH	499	struct line6_pcm_properties *properties)
705ececd	500	{
075587b7	501	int i, err;
16d603d3 CR	502	unsigned ep_read = line6->properties->ep_audio_r;
16d603d3 CR	503	unsigned ep_write = line6->properties->ep_audio_w;
b45a7c56	504	struct snd_pcm *pcm;
705ececd MG	505	struct snd_line6_pcm *line6pcm;
705ececd MG	506
4cb1a4ae	507	if (!(line6->properties->capabilities & LINE6_CAP_PCM))
e1a164d7	508	return 0; /* skip PCM initialization and report success */
705ececd	509
b45a7c56 TI	510	err = snd_line6_new_pcm(line6, &pcm);
	511	if (err < 0)
	512	return err;
705ececd	513
b45a7c56 TI	514	line6pcm = kzalloc(sizeof(*line6pcm), GFP_KERNEL);
b45a7c56 TI	515	if (!line6pcm)
705ececd MG	516	return -ENOMEM;
705ececd MG	517
63e20df1	518	mutex_init(&line6pcm->state_mutex);
b45a7c56 TI	519	line6pcm->pcm = pcm;
b45a7c56 TI	520	line6pcm->properties = properties;
1027f476 MG	521	line6pcm->volume_playback[0] = line6pcm->volume_playback[1] = 255;
1027f476 MG	522	line6pcm->volume_monitor = 255;
705ececd	523	line6pcm->line6 = line6;
3b08db37 SH	524
	525	/* Read and write buffers are sized identically, so choose minimum */
	526	line6pcm->max_packet_size = min(
	527	usb_maxpacket(line6->usbdev,
	528	usb_rcvisocpipe(line6->usbdev, ep_read), 0),
	529	usb_maxpacket(line6->usbdev,
	530	usb_sndisocpipe(line6->usbdev, ep_write), 1));
	531
ad0119ab TI	532	spin_lock_init(&line6pcm->out.lock);
ad0119ab TI	533	spin_lock_init(&line6pcm->in.lock);
075587b7	534	line6pcm->impulse_period = LINE6_IMPULSE_DEFAULT_PERIOD;
705ececd	535
b45a7c56 TI	536	line6->line6pcm = line6pcm;
	537
	538	pcm->private_data = line6pcm;
	539	pcm->private_free = line6_cleanup_pcm;
	540
1027f476	541	err = line6_create_audio_out_urbs(line6pcm);
68dc3dde	542	if (err < 0)
705ececd MG	543	return err;
705ececd MG	544
1027f476	545	err = line6_create_audio_in_urbs(line6pcm);
68dc3dde	546	if (err < 0)
705ececd MG	547	return err;
	548
	549	/* mixer: */
075587b7 TI	550	for (i = 0; i < ARRAY_SIZE(line6_controls); i++) {
	551	err = snd_ctl_add(line6->card,
	552	snd_ctl_new1(&line6_controls[i], line6pcm));
	553	if (err < 0)
	554	return err;
	555	}
1027f476	556
705ececd MG	557	return 0;
705ececd MG	558	}
ccddbe4a	559	EXPORT_SYMBOL_GPL(line6_init_pcm);
705ececd MG	560
	561	/* prepare pcm callback */
	562	int snd_line6_prepare(struct snd_pcm_substream *substream)
	563	{
	564	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
63e20df1	565	struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
705ececd	566
63e20df1 TI	567	mutex_lock(&line6pcm->state_mutex);
	568	if (!pstr->running)
	569	line6_wait_clear_audio_urbs(line6pcm, pstr);
665f3f50	570
63e20df1	571	if (!test_and_set_bit(LINE6_FLAG_PREPARED, &line6pcm->flags)) {
ad0119ab TI	572	line6pcm->out.count = 0;
	573	line6pcm->out.pos = 0;
	574	line6pcm->out.pos_done = 0;
	575	line6pcm->out.bytes = 0;
	576	line6pcm->in.count = 0;
	577	line6pcm->in.pos_done = 0;
	578	line6pcm->in.bytes = 0;
705ececd MG	579	}
705ececd MG	580
63e20df1	581	mutex_unlock(&line6pcm->state_mutex);
705ececd MG	582	return 0;
705ececd MG	583	}