[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;
			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) {
		spin_unlock_irqrestore(&pstr->lock, flags);
		line6_unlink_audio_urbs(line6pcm, pstr);
		spin_lock_irqsave(&pstr->lock, flags);
		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;
247d95ee TI	58	return err;
	59	}
	60	} else {
63e20df1	61	line6_pcm_release(line6pcm, LINE6_STREAM_IMPULSE);
247d95ee	62	}
075587b7 TI	63	return 1;
075587b7 TI	64	}
1027f476	65
075587b7 TI	66	/* impulse response period controls */
	67	static int snd_line6_impulse_period_info(struct snd_kcontrol *kcontrol,
	68	struct snd_ctl_elem_info *uinfo)
	69	{
	70	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	71	uinfo->count = 1;
	72	uinfo->value.integer.min = 0;
	73	uinfo->value.integer.max = 2000;
	74	return 0;
1027f476 MG	75	}
1027f476 MG	76
075587b7 TI	77	static int snd_line6_impulse_period_get(struct snd_kcontrol *kcontrol,
075587b7 TI	78	struct snd_ctl_elem_value *ucontrol)
1027f476	79	{
075587b7 TI	80	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
	81
	82	ucontrol->value.integer.value[0] = line6pcm->impulse_period;
	83	return 0;
1027f476 MG	84	}
1027f476 MG	85
075587b7 TI	86	static int snd_line6_impulse_period_put(struct snd_kcontrol *kcontrol,
075587b7 TI	87	struct snd_ctl_elem_value *ucontrol)
1027f476	88	{
075587b7 TI	89	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
075587b7 TI	90	int value = ucontrol->value.integer.value[0];
a3762902	91
075587b7 TI	92	if (line6pcm->impulse_period == value)
075587b7 TI	93	return 0;
a3762902	94
075587b7 TI	95	line6pcm->impulse_period = value;
075587b7 TI	96	return 1;
1027f476	97	}
1027f476	98
d8131e67 TI	99	/*
	100	Unlink all currently active URBs.
	101	*/
	102	static void line6_unlink_audio_urbs(struct snd_line6_pcm *line6pcm,
	103	struct line6_pcm_stream *pcms)
	104	{
	105	int i;
	106
	107	for (i = 0; i < LINE6_ISO_BUFFERS; i++) {
	108	if (test_bit(i, &pcms->active_urbs)) {
	109	if (!test_and_set_bit(i, &pcms->unlink_urbs))
	110	usb_unlink_urb(pcms->urbs[i]);
	111	}
	112	}
	113	}
	114
	115	/*
	116	Wait until unlinking of all currently active URBs has been finished.
	117	*/
	118	static void line6_wait_clear_audio_urbs(struct snd_line6_pcm *line6pcm,
	119	struct line6_pcm_stream *pcms)
	120	{
	121	int timeout = HZ;
	122	int i;
	123	int alive;
	124
	125	do {
	126	alive = 0;
	127	for (i = 0; i < LINE6_ISO_BUFFERS; i++) {
	128	if (test_bit(i, &pcms->active_urbs))
	129	alive++;
	130	}
	131	if (!alive)
	132	break;
	133	set_current_state(TASK_UNINTERRUPTIBLE);
	134	schedule_timeout(1);
	135	} while (--timeout > 0);
	136	if (alive)
ccaac9ed TI	137	dev_err(line6pcm->line6->ifcdev,
ccaac9ed TI	138	"timeout: still %d active urbs..\n", alive);
d8131e67 TI	139	}
d8131e67 TI	140
63e20df1 TI	141	static inline struct line6_pcm_stream *
63e20df1 TI	142	get_stream(struct snd_line6_pcm *line6pcm, int direction)
e90576c5	143	{
63e20df1 TI	144	return (direction == SNDRV_PCM_STREAM_PLAYBACK) ?
63e20df1 TI	145	&line6pcm->out : &line6pcm->in;
e90576c5 TI	146	}
e90576c5 TI	147
63e20df1 TI	148	/* allocate a buffer if not opened yet;
	149	* call this in line6pcm.state_change mutex
	150	*/
	151	static int line6_buffer_acquire(struct snd_line6_pcm *line6pcm,
	152	struct line6_pcm_stream *pstr, int type)
e90576c5	153	{
63e20df1 TI	154	/* Invoked multiple times in a row so allocate once only */
	155	if (!test_and_set_bit(type, &pstr->opened) && !pstr->buffer) {
	156	pstr->buffer = kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
	157	line6pcm->max_packet_size, GFP_KERNEL);
	158	if (!pstr->buffer)
	159	return -ENOMEM;
	160	}
	161	return 0;
e90576c5 TI	162	}
e90576c5 TI	163
63e20df1 TI	164	/* free a buffer if all streams are closed;
	165	* call this in line6pcm.state_change mutex
	166	*/
	167	static void line6_buffer_release(struct snd_line6_pcm *line6pcm,
	168	struct line6_pcm_stream *pstr, int type)
6b02a17e	169	{
63e20df1 TI	170
	171	clear_bit(type, &pstr->opened);
	172	if (!pstr->opened) {
	173	line6_wait_clear_audio_urbs(line6pcm, pstr);
	174	kfree(pstr->buffer);
	175	pstr->buffer = NULL;
	176	}
6b02a17e MG	177	}
6b02a17e MG	178
63e20df1 TI	179	/* start a PCM stream */
	180	static int line6_stream_start(struct snd_line6_pcm *line6pcm, int direction,
	181	int type)
1027f476	182	{
63e20df1 TI	183	unsigned long flags;
	184	struct line6_pcm_stream *pstr = get_stream(line6pcm, direction);
	185	int ret = 0;
	186
	187	spin_lock_irqsave(&pstr->lock, flags);
4d0e6775 TI	188	if (!test_and_set_bit(type, &pstr->running) &&
4d0e6775 TI	189	!(pstr->active_urbs \|\| pstr->unlink_urbs)) {
63e20df1 TI	190	pstr->count = 0;
	191	/* Submit all currently available URBs */
	192	if (direction == SNDRV_PCM_STREAM_PLAYBACK)
	193	ret = line6_submit_audio_out_all_urbs(line6pcm);
	194	else
	195	ret = line6_submit_audio_in_all_urbs(line6pcm);
0ca54888	196	}
63e20df1 TI	197	if (ret < 0)
	198	clear_bit(type, &pstr->running);
	199	spin_unlock_irqrestore(&pstr->lock, flags);
	200	return ret;
	201	}
0ca54888	202
63e20df1 TI	203	/* stop a PCM stream; this doesn't sync with the unlinked URBs */
	204	static void line6_stream_stop(struct snd_line6_pcm *line6pcm, int direction,
	205	int type)
	206	{
	207	unsigned long flags;
	208	struct line6_pcm_stream *pstr = get_stream(line6pcm, direction);
	209
	210	spin_lock_irqsave(&pstr->lock, flags);
	211	clear_bit(type, &pstr->running);
	212	if (!pstr->running) {
adc8a43a	213	spin_unlock_irqrestore(&pstr->lock, flags);
63e20df1	214	line6_unlink_audio_urbs(line6pcm, pstr);
adc8a43a	215	spin_lock_irqsave(&pstr->lock, flags);
63e20df1 TI	216	if (direction == SNDRV_PCM_STREAM_CAPTURE) {
	217	line6pcm->prev_fbuf = NULL;
	218	line6pcm->prev_fsize = 0;
6b02a17e	219	}
63e20df1 TI	220	}
	221	spin_unlock_irqrestore(&pstr->lock, flags);
	222	}
6b02a17e	223
63e20df1 TI	224	/* common PCM 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;
e1a164d7	230
63e20df1	231	clear_bit(LINE6_FLAG_PREPARED, &line6pcm->flags);
0ca54888	232
63e20df1 TI	233	snd_pcm_group_for_each_entry(s, substream) {
	234	if (s->pcm->card != substream->pcm->card)
	235	continue;
e1a164d7	236
63e20df1 TI	237	switch (cmd) {
	238	case SNDRV_PCM_TRIGGER_START:
	239	case SNDRV_PCM_TRIGGER_RESUME:
	240	err = line6_stream_start(line6pcm, s->stream,
	241	LINE6_STREAM_PCM);
	242	if (err < 0)
	243	return err;
	244	break;
6b02a17e	245
63e20df1 TI	246	case SNDRV_PCM_TRIGGER_STOP:
	247	case SNDRV_PCM_TRIGGER_SUSPEND:
	248	line6_stream_stop(line6pcm, s->stream,
	249	LINE6_STREAM_PCM);
	250	break;
6b02a17e	251
63e20df1 TI	252	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	253	if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
	254	return -EINVAL;
	255	set_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags);
	256	break;
e1a164d7	257
63e20df1 TI	258	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	259	if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
	260	return -EINVAL;
	261	clear_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags);
	262	break;
0ca54888	263
63e20df1 TI	264	default:
	265	return -EINVAL;
	266	}
1027f476	267	}
e1a164d7	268
1027f476 MG	269	return 0;
	270	}
	271
2954f914 TI	272	/* common PCM pointer callback */
	273	snd_pcm_uframes_t snd_line6_pointer(struct snd_pcm_substream *substream)
	274	{
	275	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	276	struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
	277
	278	return pstr->pos_done;
	279	}
	280
63e20df1 TI	281	/* Acquire and start duplex streams:
	282	* type is either LINE6_STREAM_IMPULSE or LINE6_STREAM_MONITOR
	283	*/
	284	int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int type)
1027f476	285	{
63e20df1 TI	286	struct line6_pcm_stream *pstr;
	287	int ret = 0, dir;
	288
	289	mutex_lock(&line6pcm->state_mutex);
	290	for (dir = 0; dir < 2; dir++) {
	291	pstr = get_stream(line6pcm, dir);
	292	ret = line6_buffer_acquire(line6pcm, pstr, type);
	293	if (ret < 0)
	294	goto error;
	295	if (!pstr->running)
	296	line6_wait_clear_audio_urbs(line6pcm, pstr);
f2bb614b	297	}
63e20df1 TI	298	for (dir = 0; dir < 2; dir++) {
	299	ret = line6_stream_start(line6pcm, dir, type);
	300	if (ret < 0)
	301	goto error;
1027f476	302	}
63e20df1 TI	303	error:
	304	mutex_unlock(&line6pcm->state_mutex);
	305	if (ret < 0)
	306	line6_pcm_release(line6pcm, type);
	307	return ret;
	308	}
	309	EXPORT_SYMBOL_GPL(line6_pcm_acquire);
1027f476	310
63e20df1 TI	311	/* Stop and release duplex streams */
	312	void line6_pcm_release(struct snd_line6_pcm *line6pcm, int type)
	313	{
	314	struct line6_pcm_stream *pstr;
	315	int dir;
	316
	317	mutex_lock(&line6pcm->state_mutex);
	318	for (dir = 0; dir < 2; dir++)
	319	line6_stream_stop(line6pcm, dir, type);
	320	for (dir = 0; dir < 2; dir++) {
	321	pstr = get_stream(line6pcm, dir);
	322	line6_buffer_release(line6pcm, pstr, type);
1027f476	323	}
63e20df1	324	mutex_unlock(&line6pcm->state_mutex);
1027f476	325	}
ccddbe4a	326	EXPORT_SYMBOL_GPL(line6_pcm_release);
1027f476	327
63e20df1 TI	328	/* common PCM hw_params callback */
	329	int snd_line6_hw_params(struct snd_pcm_substream *substream,
	330	struct snd_pcm_hw_params *hw_params)
705ececd	331	{
63e20df1	332	int ret;
705ececd	333	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
63e20df1 TI	334	struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
	335
	336	mutex_lock(&line6pcm->state_mutex);
	337	ret = line6_buffer_acquire(line6pcm, pstr, LINE6_STREAM_PCM);
	338	if (ret < 0)
	339	goto error;
	340
	341	ret = snd_pcm_lib_malloc_pages(substream,
	342	params_buffer_bytes(hw_params));
	343	if (ret < 0) {
	344	line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM);
	345	goto error;
	346	}
705ececd	347
63e20df1 TI	348	pstr->period = params_period_bytes(hw_params);
	349	error:
	350	mutex_unlock(&line6pcm->state_mutex);
	351	return ret;
	352	}
705ececd	353
63e20df1 TI	354	/* common PCM hw_free callback */
	355	int snd_line6_hw_free(struct snd_pcm_substream *substream)
	356	{
	357	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	358	struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
705ececd	359
63e20df1 TI	360	mutex_lock(&line6pcm->state_mutex);
	361	line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM);
	362	mutex_unlock(&line6pcm->state_mutex);
	363	return snd_pcm_lib_free_pages(substream);
705ececd MG	364	}
705ececd MG	365
63e20df1	366
705ececd	367	/* control info callback */
1027f476 MG	368	static int snd_line6_control_playback_info(struct snd_kcontrol *kcontrol,
1027f476 MG	369	struct snd_ctl_elem_info *uinfo)
68dc3dde	370	{
705ececd MG	371	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	372	uinfo->count = 2;
	373	uinfo->value.integer.min = 0;
	374	uinfo->value.integer.max = 256;
	375	return 0;
	376	}
	377
	378	/* control get callback */
1027f476 MG	379	static int snd_line6_control_playback_get(struct snd_kcontrol *kcontrol,
1027f476 MG	380	struct snd_ctl_elem_value *ucontrol)
68dc3dde	381	{
705ececd MG	382	int i;
	383	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
	384
9fb754b7	385	for (i = 0; i < 2; i++)
1027f476	386	ucontrol->value.integer.value[i] = line6pcm->volume_playback[i];
705ececd MG	387
	388	return 0;
	389	}
	390
	391	/* control put callback */
1027f476 MG	392	static int snd_line6_control_playback_put(struct snd_kcontrol *kcontrol,
1027f476 MG	393	struct snd_ctl_elem_value *ucontrol)
68dc3dde	394	{
705ececd MG	395	int i, changed = 0;
	396	struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
	397
9fb754b7	398	for (i = 0; i < 2; i++)
e1a164d7 MG	399	if (line6pcm->volume_playback[i] !=
	400	ucontrol->value.integer.value[i]) {
	401	line6pcm->volume_playback[i] =
	402	ucontrol->value.integer.value[i];
705ececd MG	403	changed = 1;
	404	}
	405
	406	return changed;
	407	}
	408
	409	/* control definition */
075587b7 TI	410	static struct snd_kcontrol_new line6_controls[] = {
	411	{
	412	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	413	.name = "PCM Playback Volume",
	414	.info = snd_line6_control_playback_info,
	415	.get = snd_line6_control_playback_get,
	416	.put = snd_line6_control_playback_put
	417	},
	418	{
	419	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	420	.name = "Impulse Response Volume",
	421	.info = snd_line6_impulse_volume_info,
	422	.get = snd_line6_impulse_volume_get,
	423	.put = snd_line6_impulse_volume_put
	424	},
	425	{
	426	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	427	.name = "Impulse Response Period",
	428	.info = snd_line6_impulse_period_info,
	429	.get = snd_line6_impulse_period_get,
	430	.put = snd_line6_impulse_period_put
	431	},
705ececd MG	432	};
	433
	434	/*
	435	Cleanup the PCM device.
	436	*/
d8131e67	437	static void cleanup_urbs(struct line6_pcm_stream *pcms)
705ececd MG	438	{
705ececd MG	439	int i;
705ececd	440
9fb754b7	441	for (i = 0; i < LINE6_ISO_BUFFERS; i++) {
d8131e67 TI	442	if (pcms->urbs[i]) {
	443	usb_kill_urb(pcms->urbs[i]);
	444	usb_free_urb(pcms->urbs[i]);
705ececd MG	445	}
705ececd MG	446	}
d8131e67 TI	447	}
	448
	449	static void line6_cleanup_pcm(struct snd_pcm *pcm)
	450	{
	451	struct snd_line6_pcm *line6pcm = snd_pcm_chip(pcm);
	452
	453	cleanup_urbs(&line6pcm->out);
	454	cleanup_urbs(&line6pcm->in);
b45a7c56	455	kfree(line6pcm);
705ececd MG	456	}
	457
	458	/* create a PCM device */
b45a7c56	459	static int snd_line6_new_pcm(struct usb_line6 line6, struct snd_pcm *pcm_ret)
705ececd MG	460	{
	461	struct snd_pcm *pcm;
	462	int err;
	463
b45a7c56 TI	464	err = snd_pcm_new(line6->card, (char *)line6->properties->name,
b45a7c56 TI	465	0, 1, 1, pcm_ret);
68dc3dde	466	if (err < 0)
705ececd	467	return err;
b45a7c56 TI	468	pcm = *pcm_ret;
b45a7c56 TI	469	strcpy(pcm->name, line6->properties->name);
705ececd MG	470
705ececd MG	471	/* set operators */
afb9091d SB	472	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
afb9091d SB	473	&snd_line6_playback_ops);
e1a164d7	474	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_line6_capture_ops);
705ececd MG	475
705ececd MG	476	/* pre-allocation of buffers */
68dc3dde	477	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
e1a164d7 MG	478	snd_dma_continuous_data
	479	(GFP_KERNEL), 64 * 1024,
	480	128 * 1024);
705ececd MG	481	return 0;
	482	}
	483
1027f476	484	/*
5a475311	485	Sync with PCM stream stops.
1027f476 MG	486	*/
	487	void line6_pcm_disconnect(struct snd_line6_pcm *line6pcm)
	488	{
d8131e67 TI	489	line6_unlink_audio_urbs(line6pcm, &line6pcm->out);
	490	line6_unlink_audio_urbs(line6pcm, &line6pcm->in);
	491	line6_wait_clear_audio_urbs(line6pcm, &line6pcm->out);
	492	line6_wait_clear_audio_urbs(line6pcm, &line6pcm->in);
1027f476 MG	493	}
1027f476 MG	494
705ececd MG	495	/*
	496	Create and register the PCM device and mixer entries.
	497	Create URBs for playback and capture.
	498	*/
68dc3dde GKH	499	int line6_init_pcm(struct usb_line6 *line6,
68dc3dde GKH	500	struct line6_pcm_properties *properties)
705ececd	501	{
075587b7	502	int i, err;
16d603d3 CR	503	unsigned ep_read = line6->properties->ep_audio_r;
16d603d3 CR	504	unsigned ep_write = line6->properties->ep_audio_w;
b45a7c56	505	struct snd_pcm *pcm;
705ececd MG	506	struct snd_line6_pcm *line6pcm;
705ececd MG	507
4cb1a4ae	508	if (!(line6->properties->capabilities & LINE6_CAP_PCM))
e1a164d7	509	return 0; /* skip PCM initialization and report success */
705ececd	510
b45a7c56 TI	511	err = snd_line6_new_pcm(line6, &pcm);
	512	if (err < 0)
	513	return err;
705ececd	514
b45a7c56 TI	515	line6pcm = kzalloc(sizeof(*line6pcm), GFP_KERNEL);
b45a7c56 TI	516	if (!line6pcm)
705ececd MG	517	return -ENOMEM;
705ececd MG	518
63e20df1	519	mutex_init(&line6pcm->state_mutex);
b45a7c56 TI	520	line6pcm->pcm = pcm;
b45a7c56 TI	521	line6pcm->properties = properties;
1027f476 MG	522	line6pcm->volume_playback[0] = line6pcm->volume_playback[1] = 255;
1027f476 MG	523	line6pcm->volume_monitor = 255;
705ececd	524	line6pcm->line6 = line6;
3b08db37 SH	525
	526	/* Read and write buffers are sized identically, so choose minimum */
	527	line6pcm->max_packet_size = min(
	528	usb_maxpacket(line6->usbdev,
	529	usb_rcvisocpipe(line6->usbdev, ep_read), 0),
	530	usb_maxpacket(line6->usbdev,
	531	usb_sndisocpipe(line6->usbdev, ep_write), 1));
	532
ad0119ab TI	533	spin_lock_init(&line6pcm->out.lock);
ad0119ab TI	534	spin_lock_init(&line6pcm->in.lock);
075587b7	535	line6pcm->impulse_period = LINE6_IMPULSE_DEFAULT_PERIOD;
705ececd	536
b45a7c56 TI	537	line6->line6pcm = line6pcm;
	538
	539	pcm->private_data = line6pcm;
	540	pcm->private_free = line6_cleanup_pcm;
	541
1027f476	542	err = line6_create_audio_out_urbs(line6pcm);
68dc3dde	543	if (err < 0)
705ececd MG	544	return err;
705ececd MG	545
1027f476	546	err = line6_create_audio_in_urbs(line6pcm);
68dc3dde	547	if (err < 0)
705ececd MG	548	return err;
	549
	550	/* mixer: */
075587b7 TI	551	for (i = 0; i < ARRAY_SIZE(line6_controls); i++) {
	552	err = snd_ctl_add(line6->card,
	553	snd_ctl_new1(&line6_controls[i], line6pcm));
	554	if (err < 0)
	555	return err;
	556	}
1027f476	557
705ececd MG	558	return 0;
705ececd MG	559	}
ccddbe4a	560	EXPORT_SYMBOL_GPL(line6_init_pcm);
705ececd MG	561
	562	/* prepare pcm callback */
	563	int snd_line6_prepare(struct snd_pcm_substream *substream)
	564	{
	565	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
63e20df1	566	struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
705ececd	567
63e20df1 TI	568	mutex_lock(&line6pcm->state_mutex);
	569	if (!pstr->running)
	570	line6_wait_clear_audio_urbs(line6pcm, pstr);
665f3f50	571
63e20df1	572	if (!test_and_set_bit(LINE6_FLAG_PREPARED, &line6pcm->flags)) {
ad0119ab TI	573	line6pcm->out.count = 0;
	574	line6pcm->out.pos = 0;
	575	line6pcm->out.pos_done = 0;
	576	line6pcm->out.bytes = 0;
	577	line6pcm->in.count = 0;
	578	line6pcm->in.pos_done = 0;
	579	line6pcm->in.bytes = 0;
705ececd MG	580	}
705ececd MG	581
63e20df1	582	mutex_unlock(&line6pcm->state_mutex);
705ececd MG	583	return 0;
705ececd MG	584	}