aloop.c 36.3 KB
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/*
 *  Loopback soundcard
 *
 *  Original code:
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *
 *  More accurate positioning and full-duplex support:
 *  Copyright (c) Ahmet İnan <ainan at mathematik.uni-freiburg.de>
 *
 *  Major (almost complete) rewrite:
 *  Copyright (c) by Takashi Iwai <tiwai@suse.de>
 *
 *  A next major update in 2010 (separate timers for playback and capture):
 *  Copyright (c) Jaroslav Kysela <perex@perex.cz>
 *
 *   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; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/wait.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/info.h>
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#include <sound/initval.h>

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("A loopback soundcard");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{ALSA,Loopback soundcard}}");

#define MAX_PCM_SUBSTREAMS	8

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
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static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
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static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
static int pcm_notify[SNDRV_CARDS];

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for loopback soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for loopback soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable this loopback soundcard.");
module_param_array(pcm_substreams, int, NULL, 0444);
MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-8) for loopback driver.");
module_param_array(pcm_notify, int, NULL, 0444);
MODULE_PARM_DESC(pcm_notify, "Break capture when PCM format/rate/channels changes.");

#define NO_PITCH 100000

struct loopback_pcm;

struct loopback_cable {
	spinlock_t lock;
	struct loopback_pcm *streams[2];
	struct snd_pcm_hardware hw;
	/* flags */
	unsigned int valid;
	unsigned int running;
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	unsigned int pause;
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};

struct loopback_setup {
	unsigned int notify: 1;
	unsigned int rate_shift;
	unsigned int format;
	unsigned int rate;
	unsigned int channels;
	struct snd_ctl_elem_id active_id;
	struct snd_ctl_elem_id format_id;
	struct snd_ctl_elem_id rate_id;
	struct snd_ctl_elem_id channels_id;
};

struct loopback {
	struct snd_card *card;
	struct mutex cable_lock;
	struct loopback_cable *cables[MAX_PCM_SUBSTREAMS][2];
	struct snd_pcm *pcm[2];
	struct loopback_setup setup[MAX_PCM_SUBSTREAMS][2];
};

struct loopback_pcm {
	struct loopback *loopback;
	struct snd_pcm_substream *substream;
	struct loopback_cable *cable;
	unsigned int pcm_buffer_size;
	unsigned int buf_pos;	/* position in buffer */
	unsigned int silent_size;
	/* PCM parameters */
	unsigned int pcm_period_size;
	unsigned int pcm_bps;		/* bytes per second */
	unsigned int pcm_salign;	/* bytes per sample * channels */
	unsigned int pcm_rate_shift;	/* rate shift value */
	/* flags */
	unsigned int period_update_pending :1;
	/* timer stuff */
	unsigned int irq_pos;		/* fractional IRQ position */
	unsigned int period_size_frac;
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	unsigned int last_drift;
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	unsigned long last_jiffies;
	struct timer_list timer;
};

static struct platform_device *devices[SNDRV_CARDS];

static inline unsigned int byte_pos(struct loopback_pcm *dpcm, unsigned int x)
{
	if (dpcm->pcm_rate_shift == NO_PITCH) {
		x /= HZ;
	} else {
		x = div_u64(NO_PITCH * (unsigned long long)x,
			    HZ * (unsigned long long)dpcm->pcm_rate_shift);
	}
	return x - (x % dpcm->pcm_salign);
}

static inline unsigned int frac_pos(struct loopback_pcm *dpcm, unsigned int x)
{
	if (dpcm->pcm_rate_shift == NO_PITCH) {	/* no pitch */
		return x * HZ;
	} else {
		x = div_u64(dpcm->pcm_rate_shift * (unsigned long long)x * HZ,
			    NO_PITCH);
	}
	return x;
}

static inline struct loopback_setup *get_setup(struct loopback_pcm *dpcm)
{
	int device = dpcm->substream->pstr->pcm->device;
	
	if (dpcm->substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		device ^= 1;
	return &dpcm->loopback->setup[dpcm->substream->number][device];
}

static inline unsigned int get_notify(struct loopback_pcm *dpcm)
{
	return get_setup(dpcm)->notify;
}

static inline unsigned int get_rate_shift(struct loopback_pcm *dpcm)
{
	return get_setup(dpcm)->rate_shift;
}

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/* call in cable->lock */
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static void loopback_timer_start(struct loopback_pcm *dpcm)
{
	unsigned long tick;
	unsigned int rate_shift = get_rate_shift(dpcm);

	if (rate_shift != dpcm->pcm_rate_shift) {
		dpcm->pcm_rate_shift = rate_shift;
		dpcm->period_size_frac = frac_pos(dpcm, dpcm->pcm_period_size);
	}
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	if (dpcm->period_size_frac <= dpcm->irq_pos) {
		dpcm->irq_pos %= dpcm->period_size_frac;
		dpcm->period_update_pending = 1;
	}
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	tick = dpcm->period_size_frac - dpcm->irq_pos;
	tick = (tick + dpcm->pcm_bps - 1) / dpcm->pcm_bps;
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	mod_timer(&dpcm->timer, jiffies + tick);
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}

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/* call in cable->lock */
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static inline void loopback_timer_stop(struct loopback_pcm *dpcm)
{
	del_timer(&dpcm->timer);
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	dpcm->timer.expires = 0;
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}

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static inline void loopback_timer_stop_sync(struct loopback_pcm *dpcm)
{
	del_timer_sync(&dpcm->timer);
}

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#define CABLE_VALID_PLAYBACK	(1 << SNDRV_PCM_STREAM_PLAYBACK)
#define CABLE_VALID_CAPTURE	(1 << SNDRV_PCM_STREAM_CAPTURE)
#define CABLE_VALID_BOTH	(CABLE_VALID_PLAYBACK|CABLE_VALID_CAPTURE)

static int loopback_check_format(struct loopback_cable *cable, int stream)
{
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	struct snd_pcm_runtime *runtime, *cruntime;
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	struct loopback_setup *setup;
	struct snd_card *card;
	int check;

	if (cable->valid != CABLE_VALID_BOTH) {
		if (stream == SNDRV_PCM_STREAM_PLAYBACK)
			goto __notify;
		return 0;
	}
	runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->
							substream->runtime;
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	cruntime = cable->streams[SNDRV_PCM_STREAM_CAPTURE]->
							substream->runtime;
	check = runtime->format != cruntime->format ||
		runtime->rate != cruntime->rate ||
		runtime->channels != cruntime->channels;
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	if (!check)
		return 0;
	if (stream == SNDRV_PCM_STREAM_CAPTURE) {
		return -EIO;
	} else {
		snd_pcm_stop(cable->streams[SNDRV_PCM_STREAM_CAPTURE]->
					substream, SNDRV_PCM_STATE_DRAINING);
	      __notify:
		runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->
							substream->runtime;
		setup = get_setup(cable->streams[SNDRV_PCM_STREAM_PLAYBACK]);
		card = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->loopback->card;
		if (setup->format != runtime->format) {
			snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
							&setup->format_id);
			setup->format = runtime->format;
		}
		if (setup->rate != runtime->rate) {
			snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
							&setup->rate_id);
			setup->rate = runtime->rate;
		}
		if (setup->channels != runtime->channels) {
			snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
							&setup->channels_id);
			setup->channels = runtime->channels;
		}
	}
	return 0;
}

static void loopback_active_notify(struct loopback_pcm *dpcm)
{
	snd_ctl_notify(dpcm->loopback->card,
		       SNDRV_CTL_EVENT_MASK_VALUE,
		       &get_setup(dpcm)->active_id);
}

static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct loopback_pcm *dpcm = runtime->private_data;
	struct loopback_cable *cable = dpcm->cable;
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	int err, stream = 1 << substream->stream;
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	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		err = loopback_check_format(cable, substream->stream);
		if (err < 0)
			return err;
		dpcm->last_jiffies = jiffies;
		dpcm->pcm_rate_shift = 0;
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		dpcm->last_drift = 0;
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		spin_lock(&cable->lock);	
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		cable->running |= stream;
		cable->pause &= ~stream;
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		loopback_timer_start(dpcm);
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		spin_unlock(&cable->lock);
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		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			loopback_active_notify(dpcm);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
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		spin_lock(&cable->lock);	
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		cable->running &= ~stream;
		cable->pause &= ~stream;
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		loopback_timer_stop(dpcm);
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		spin_unlock(&cable->lock);
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		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			loopback_active_notify(dpcm);
		break;
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	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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	case SNDRV_PCM_TRIGGER_SUSPEND:
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		spin_lock(&cable->lock);	
		cable->pause |= stream;
		loopback_timer_stop(dpcm);
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		spin_unlock(&cable->lock);
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		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			loopback_active_notify(dpcm);
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		break;
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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	case SNDRV_PCM_TRIGGER_RESUME:
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		spin_lock(&cable->lock);
		dpcm->last_jiffies = jiffies;
		cable->pause &= ~stream;
		loopback_timer_start(dpcm);
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		spin_unlock(&cable->lock);
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		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			loopback_active_notify(dpcm);
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		break;
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	default:
		return -EINVAL;
	}
	return 0;
}

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static void params_change(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct loopback_pcm *dpcm = runtime->private_data;
	struct loopback_cable *cable = dpcm->cable;

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	cable->hw.formats = pcm_format_to_bits(runtime->format);
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	cable->hw.rate_min = runtime->rate;
	cable->hw.rate_max = runtime->rate;
	cable->hw.channels_min = runtime->channels;
	cable->hw.channels_max = runtime->channels;
}

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static int loopback_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct loopback_pcm *dpcm = runtime->private_data;
	struct loopback_cable *cable = dpcm->cable;
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	int bps, salign;
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	loopback_timer_stop_sync(dpcm);

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	salign = (snd_pcm_format_width(runtime->format) *
						runtime->channels) / 8;
	bps = salign * runtime->rate;
	if (bps <= 0 || salign <= 0)
		return -EINVAL;

	dpcm->buf_pos = 0;
	dpcm->pcm_buffer_size = frames_to_bytes(runtime, runtime->buffer_size);
	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
		/* clear capture buffer */
		dpcm->silent_size = dpcm->pcm_buffer_size;
		snd_pcm_format_set_silence(runtime->format, runtime->dma_area,
					   runtime->buffer_size * runtime->channels);
	}

	dpcm->irq_pos = 0;
	dpcm->period_update_pending = 0;
	dpcm->pcm_bps = bps;
	dpcm->pcm_salign = salign;
	dpcm->pcm_period_size = frames_to_bytes(runtime, runtime->period_size);

	mutex_lock(&dpcm->loopback->cable_lock);
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	if (!(cable->valid & ~(1 << substream->stream)) ||
            (get_setup(dpcm)->notify &&
	     substream->stream == SNDRV_PCM_STREAM_PLAYBACK))
		params_change(substream);
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	cable->valid |= 1 << substream->stream;
	mutex_unlock(&dpcm->loopback->cable_lock);

	return 0;
}

static void clear_capture_buf(struct loopback_pcm *dpcm, unsigned int bytes)
{
	struct snd_pcm_runtime *runtime = dpcm->substream->runtime;
	char *dst = runtime->dma_area;
	unsigned int dst_off = dpcm->buf_pos;

	if (dpcm->silent_size >= dpcm->pcm_buffer_size)
		return;
	if (dpcm->silent_size + bytes > dpcm->pcm_buffer_size)
		bytes = dpcm->pcm_buffer_size - dpcm->silent_size;

	for (;;) {
		unsigned int size = bytes;
		if (dst_off + size > dpcm->pcm_buffer_size)
			size = dpcm->pcm_buffer_size - dst_off;
		snd_pcm_format_set_silence(runtime->format, dst + dst_off,
					   bytes_to_frames(runtime, size) *
					   	runtime->channels);
		dpcm->silent_size += size;
		bytes -= size;
		if (!bytes)
			break;
		dst_off = 0;
	}
}

static void copy_play_buf(struct loopback_pcm *play,
			  struct loopback_pcm *capt,
			  unsigned int bytes)
{
	struct snd_pcm_runtime *runtime = play->substream->runtime;
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	char *src = runtime->dma_area;
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	char *dst = capt->substream->runtime->dma_area;
	unsigned int src_off = play->buf_pos;
	unsigned int dst_off = capt->buf_pos;
	unsigned int clear_bytes = 0;

	/* check if playback is draining, trim the capture copy size
	 * when our pointer is at the end of playback ring buffer */
	if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
	    snd_pcm_playback_hw_avail(runtime) < runtime->buffer_size) { 
	    	snd_pcm_uframes_t appl_ptr, appl_ptr1, diff;
		appl_ptr = appl_ptr1 = runtime->control->appl_ptr;
		appl_ptr1 -= appl_ptr1 % runtime->buffer_size;
		appl_ptr1 += play->buf_pos / play->pcm_salign;
		if (appl_ptr < appl_ptr1)
			appl_ptr1 -= runtime->buffer_size;
		diff = (appl_ptr - appl_ptr1) * play->pcm_salign;
		if (diff < bytes) {
			clear_bytes = bytes - diff;
			bytes = diff;
		}
	}

	for (;;) {
		unsigned int size = bytes;
		if (src_off + size > play->pcm_buffer_size)
			size = play->pcm_buffer_size - src_off;
		if (dst_off + size > capt->pcm_buffer_size)
			size = capt->pcm_buffer_size - dst_off;
		memcpy(dst + dst_off, src + src_off, size);
		capt->silent_size = 0;
		bytes -= size;
		if (!bytes)
			break;
		src_off = (src_off + size) % play->pcm_buffer_size;
		dst_off = (dst_off + size) % capt->pcm_buffer_size;
	}

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	if (clear_bytes > 0) {
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		clear_capture_buf(capt, clear_bytes);
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		capt->silent_size = 0;
	}
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}

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static inline unsigned int bytepos_delta(struct loopback_pcm *dpcm,
					 unsigned int jiffies_delta)
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{
	unsigned long last_pos;
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	unsigned int delta;
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	last_pos = byte_pos(dpcm, dpcm->irq_pos);
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	dpcm->irq_pos += jiffies_delta * dpcm->pcm_bps;
	delta = byte_pos(dpcm, dpcm->irq_pos) - last_pos;
	if (delta >= dpcm->last_drift)
		delta -= dpcm->last_drift;
	dpcm->last_drift = 0;
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	if (dpcm->irq_pos >= dpcm->period_size_frac) {
		dpcm->irq_pos %= dpcm->period_size_frac;
		dpcm->period_update_pending = 1;
	}
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	return delta;
}

static inline void bytepos_finish(struct loopback_pcm *dpcm,
				  unsigned int delta)
{
	dpcm->buf_pos += delta;
	dpcm->buf_pos %= dpcm->pcm_buffer_size;
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}

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/* call in cable->lock */
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static unsigned int loopback_pos_update(struct loopback_cable *cable)
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{
	struct loopback_pcm *dpcm_play =
			cable->streams[SNDRV_PCM_STREAM_PLAYBACK];
	struct loopback_pcm *dpcm_capt =
			cable->streams[SNDRV_PCM_STREAM_CAPTURE];
	unsigned long delta_play = 0, delta_capt = 0;
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	unsigned int running, count1, count2;
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	running = cable->running ^ cable->pause;
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	if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) {
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		delta_play = jiffies - dpcm_play->last_jiffies;
		dpcm_play->last_jiffies += delta_play;
	}

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	if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) {
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		delta_capt = jiffies - dpcm_capt->last_jiffies;
		dpcm_capt->last_jiffies += delta_capt;
	}

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	if (delta_play == 0 && delta_capt == 0)
		goto unlock;
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	if (delta_play > delta_capt) {
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		count1 = bytepos_delta(dpcm_play, delta_play - delta_capt);
		bytepos_finish(dpcm_play, count1);
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		delta_play = delta_capt;
	} else if (delta_play < delta_capt) {
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		count1 = bytepos_delta(dpcm_capt, delta_capt - delta_play);
		clear_capture_buf(dpcm_capt, count1);
		bytepos_finish(dpcm_capt, count1);
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		delta_capt = delta_play;
	}

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	if (delta_play == 0 && delta_capt == 0)
		goto unlock;

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	/* note delta_capt == delta_play at this moment */
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	count1 = bytepos_delta(dpcm_play, delta_play);
	count2 = bytepos_delta(dpcm_capt, delta_capt);
	if (count1 < count2) {
		dpcm_capt->last_drift = count2 - count1;
		count1 = count2;
	} else if (count1 > count2) {
		dpcm_play->last_drift = count1 - count2;
	}
	copy_play_buf(dpcm_play, dpcm_capt, count1);
	bytepos_finish(dpcm_play, count1);
	bytepos_finish(dpcm_capt, count1);
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 unlock:
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	return running;
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}

static void loopback_timer_function(unsigned long data)
{
	struct loopback_pcm *dpcm = (struct loopback_pcm *)data;
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	unsigned long flags;
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	spin_lock_irqsave(&dpcm->cable->lock, flags);
	if (loopback_pos_update(dpcm->cable) & (1 << dpcm->substream->stream)) {
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		loopback_timer_start(dpcm);
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		if (dpcm->period_update_pending) {
			dpcm->period_update_pending = 0;
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			spin_unlock_irqrestore(&dpcm->cable->lock, flags);
			/* need to unlock before calling below */
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			snd_pcm_period_elapsed(dpcm->substream);
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			return;
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		}
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	}
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	spin_unlock_irqrestore(&dpcm->cable->lock, flags);
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}

static snd_pcm_uframes_t loopback_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct loopback_pcm *dpcm = runtime->private_data;
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	snd_pcm_uframes_t pos;
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	spin_lock(&dpcm->cable->lock);
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	loopback_pos_update(dpcm->cable);
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	pos = dpcm->buf_pos;
	spin_unlock(&dpcm->cable->lock);
	return bytes_to_frames(runtime, pos);
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}

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static const struct snd_pcm_hardware loopback_pcm_hardware =
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{
	.info =		(SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP |
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			 SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE |
			 SNDRV_PCM_INFO_RESUME),
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	.formats =	(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
			 SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE |
			 SNDRV_PCM_FMTBIT_FLOAT_LE | SNDRV_PCM_FMTBIT_FLOAT_BE),
	.rates =	SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_192000,
	.rate_min =		8000,
	.rate_max =		192000,
	.channels_min =		1,
	.channels_max =		32,
	.buffer_bytes_max =	2 * 1024 * 1024,
	.period_bytes_min =	64,
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	/* note check overflow in frac_pos() using pcm_rate_shift before
	   changing period_bytes_max value */
	.period_bytes_max =	1024 * 1024,
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	.periods_min =		1,
	.periods_max =		1024,
	.fifo_size =		0,
};

static void loopback_runtime_free(struct snd_pcm_runtime *runtime)
{
	struct loopback_pcm *dpcm = runtime->private_data;
	kfree(dpcm);
}

static int loopback_hw_params(struct snd_pcm_substream *substream,
			      struct snd_pcm_hw_params *params)
{
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	return snd_pcm_lib_alloc_vmalloc_buffer(substream,
						params_buffer_bytes(params));
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}

static int loopback_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct loopback_pcm *dpcm = runtime->private_data;
	struct loopback_cable *cable = dpcm->cable;

	mutex_lock(&dpcm->loopback->cable_lock);
	cable->valid &= ~(1 << substream->stream);
	mutex_unlock(&dpcm->loopback->cable_lock);
604
	return snd_pcm_lib_free_vmalloc_buffer(substream);
605 606 607 608 609 610 611 612 613 614
}

static unsigned int get_cable_index(struct snd_pcm_substream *substream)
{
	if (!substream->pcm->device)
		return substream->stream;
	else
		return !substream->stream;
}

615 616 617
static int rule_format(struct snd_pcm_hw_params *params,
		       struct snd_pcm_hw_rule *rule)
{
618 619
	struct loopback_pcm *dpcm = rule->private;
	struct loopback_cable *cable = dpcm->cable;
620
	struct snd_mask m;
621

622
	snd_mask_none(&m);
623 624 625 626
	mutex_lock(&dpcm->loopback->cable_lock);
	m.bits[0] = (u_int32_t)cable->hw.formats;
	m.bits[1] = (u_int32_t)(cable->hw.formats >> 32);
	mutex_unlock(&dpcm->loopback->cable_lock);
627
	return snd_mask_refine(hw_param_mask(params, rule->var), &m);
628 629 630 631 632
}

static int rule_rate(struct snd_pcm_hw_params *params,
		     struct snd_pcm_hw_rule *rule)
{
633 634
	struct loopback_pcm *dpcm = rule->private;
	struct loopback_cable *cable = dpcm->cable;
635 636
	struct snd_interval t;

637 638 639 640
	mutex_lock(&dpcm->loopback->cable_lock);
	t.min = cable->hw.rate_min;
	t.max = cable->hw.rate_max;
	mutex_unlock(&dpcm->loopback->cable_lock);
641 642 643 644 645 646 647 648
        t.openmin = t.openmax = 0;
        t.integer = 0;
	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}

static int rule_channels(struct snd_pcm_hw_params *params,
			 struct snd_pcm_hw_rule *rule)
{
649 650
	struct loopback_pcm *dpcm = rule->private;
	struct loopback_cable *cable = dpcm->cable;
651 652
	struct snd_interval t;

653 654 655 656
	mutex_lock(&dpcm->loopback->cable_lock);
	t.min = cable->hw.channels_min;
	t.max = cable->hw.channels_max;
	mutex_unlock(&dpcm->loopback->cable_lock);
657 658 659 660 661
        t.openmin = t.openmax = 0;
        t.integer = 0;
	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}

662 663 664 665 666 667 668 669 670 671 672
static void free_cable(struct snd_pcm_substream *substream)
{
	struct loopback *loopback = substream->private_data;
	int dev = get_cable_index(substream);
	struct loopback_cable *cable;

	cable = loopback->cables[substream->number][dev];
	if (!cable)
		return;
	if (cable->streams[!substream->stream]) {
		/* other stream is still alive */
673
		spin_lock_irq(&cable->lock);
674
		cable->streams[substream->stream] = NULL;
675
		spin_unlock_irq(&cable->lock);
676 677 678 679 680 681 682
	} else {
		/* free the cable */
		loopback->cables[substream->number][dev] = NULL;
		kfree(cable);
	}
}

683 684 685 686 687
static int loopback_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct loopback *loopback = substream->private_data;
	struct loopback_pcm *dpcm;
688
	struct loopback_cable *cable = NULL;
689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717
	int err = 0;
	int dev = get_cable_index(substream);

	mutex_lock(&loopback->cable_lock);
	dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
	if (!dpcm) {
		err = -ENOMEM;
		goto unlock;
	}
	dpcm->loopback = loopback;
	dpcm->substream = substream;
	setup_timer(&dpcm->timer, loopback_timer_function,
		    (unsigned long)dpcm);

	cable = loopback->cables[substream->number][dev];
	if (!cable) {
		cable = kzalloc(sizeof(*cable), GFP_KERNEL);
		if (!cable) {
			err = -ENOMEM;
			goto unlock;
		}
		spin_lock_init(&cable->lock);
		cable->hw = loopback_pcm_hardware;
		loopback->cables[substream->number][dev] = cable;
	}
	dpcm->cable = cable;

	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);

718 719 720 721 722
	/* use dynamic rules based on actual runtime->hw values */
	/* note that the default rules created in the PCM midlevel code */
	/* are cached -> they do not reflect the actual state */
	err = snd_pcm_hw_rule_add(runtime, 0,
				  SNDRV_PCM_HW_PARAM_FORMAT,
723
				  rule_format, dpcm,
724 725 726 727 728
				  SNDRV_PCM_HW_PARAM_FORMAT, -1);
	if (err < 0)
		goto unlock;
	err = snd_pcm_hw_rule_add(runtime, 0,
				  SNDRV_PCM_HW_PARAM_RATE,
729
				  rule_rate, dpcm,
730 731 732 733 734
				  SNDRV_PCM_HW_PARAM_RATE, -1);
	if (err < 0)
		goto unlock;
	err = snd_pcm_hw_rule_add(runtime, 0,
				  SNDRV_PCM_HW_PARAM_CHANNELS,
735
				  rule_channels, dpcm,
736 737 738 739
				  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
	if (err < 0)
		goto unlock;

740 741
	runtime->private_data = dpcm;
	runtime->private_free = loopback_runtime_free;
742
	if (get_notify(dpcm))
743
		runtime->hw = loopback_pcm_hardware;
744
	else
745
		runtime->hw = cable->hw;
746 747 748 749 750

	spin_lock_irq(&cable->lock);
	cable->streams[substream->stream] = dpcm;
	spin_unlock_irq(&cable->lock);

751
 unlock:
752 753 754 755
	if (err < 0) {
		free_cable(substream);
		kfree(dpcm);
	}
756 757 758 759 760 761 762 763 764
	mutex_unlock(&loopback->cable_lock);
	return err;
}

static int loopback_close(struct snd_pcm_substream *substream)
{
	struct loopback *loopback = substream->private_data;
	struct loopback_pcm *dpcm = substream->runtime->private_data;

765
	loopback_timer_stop_sync(dpcm);
766
	mutex_lock(&loopback->cable_lock);
767
	free_cable(substream);
768 769 770 771
	mutex_unlock(&loopback->cable_lock);
	return 0;
}

772
static const struct snd_pcm_ops loopback_playback_ops = {
773 774 775 776 777 778 779 780
	.open =		loopback_open,
	.close =	loopback_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	loopback_hw_params,
	.hw_free =	loopback_hw_free,
	.prepare =	loopback_prepare,
	.trigger =	loopback_trigger,
	.pointer =	loopback_pointer,
781 782
	.page =		snd_pcm_lib_get_vmalloc_page,
	.mmap =		snd_pcm_lib_mmap_vmalloc,
783 784
};

785
static const struct snd_pcm_ops loopback_capture_ops = {
786 787 788 789 790 791 792 793
	.open =		loopback_open,
	.close =	loopback_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	loopback_hw_params,
	.hw_free =	loopback_hw_free,
	.prepare =	loopback_prepare,
	.trigger =	loopback_trigger,
	.pointer =	loopback_pointer,
794 795
	.page =		snd_pcm_lib_get_vmalloc_page,
	.mmap =		snd_pcm_lib_mmap_vmalloc,
796 797
};

798 799
static int loopback_pcm_new(struct loopback *loopback,
			    int device, int substreams)
800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834
{
	struct snd_pcm *pcm;
	int err;

	err = snd_pcm_new(loopback->card, "Loopback PCM", device,
			  substreams, substreams, &pcm);
	if (err < 0)
		return err;
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &loopback_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &loopback_capture_ops);

	pcm->private_data = loopback;
	pcm->info_flags = 0;
	strcpy(pcm->name, "Loopback PCM");

	loopback->pcm[device] = pcm;
	return 0;
}

static int loopback_rate_shift_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 = 80000;
	uinfo->value.integer.max = 120000;
	uinfo->value.integer.step = 1;
	return 0;
}                                  

static int loopback_rate_shift_get(struct snd_kcontrol *kcontrol,
				   struct snd_ctl_elem_value *ucontrol)
{
	struct loopback *loopback = snd_kcontrol_chip(kcontrol);
	
835
	mutex_lock(&loopback->cable_lock);
836 837 838
	ucontrol->value.integer.value[0] =
		loopback->setup[kcontrol->id.subdevice]
			       [kcontrol->id.device].rate_shift;
839
	mutex_unlock(&loopback->cable_lock);
840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870
	return 0;
}

static int loopback_rate_shift_put(struct snd_kcontrol *kcontrol,
				   struct snd_ctl_elem_value *ucontrol)
{
	struct loopback *loopback = snd_kcontrol_chip(kcontrol);
	unsigned int val;
	int change = 0;

	val = ucontrol->value.integer.value[0];
	if (val < 80000)
		val = 80000;
	if (val > 120000)
		val = 120000;	
	mutex_lock(&loopback->cable_lock);
	if (val != loopback->setup[kcontrol->id.subdevice]
				  [kcontrol->id.device].rate_shift) {
		loopback->setup[kcontrol->id.subdevice]
			       [kcontrol->id.device].rate_shift = val;
		change = 1;
	}
	mutex_unlock(&loopback->cable_lock);
	return change;
}

static int loopback_notify_get(struct snd_kcontrol *kcontrol,
			       struct snd_ctl_elem_value *ucontrol)
{
	struct loopback *loopback = snd_kcontrol_chip(kcontrol);
	
871
	mutex_lock(&loopback->cable_lock);
872 873 874
	ucontrol->value.integer.value[0] =
		loopback->setup[kcontrol->id.subdevice]
			       [kcontrol->id.device].notify;
875
	mutex_unlock(&loopback->cable_lock);
876 877 878 879 880 881 882 883 884 885 886
	return 0;
}

static int loopback_notify_put(struct snd_kcontrol *kcontrol,
			       struct snd_ctl_elem_value *ucontrol)
{
	struct loopback *loopback = snd_kcontrol_chip(kcontrol);
	unsigned int val;
	int change = 0;

	val = ucontrol->value.integer.value[0] ? 1 : 0;
887
	mutex_lock(&loopback->cable_lock);
888 889 890 891 892 893
	if (val != loopback->setup[kcontrol->id.subdevice]
				[kcontrol->id.device].notify) {
		loopback->setup[kcontrol->id.subdevice]
			[kcontrol->id.device].notify = val;
		change = 1;
	}
894
	mutex_unlock(&loopback->cable_lock);
895 896 897 898 899 900 901
	return change;
}

static int loopback_active_get(struct snd_kcontrol *kcontrol,
			       struct snd_ctl_elem_value *ucontrol)
{
	struct loopback *loopback = snd_kcontrol_chip(kcontrol);
902 903
	struct loopback_cable *cable;

904 905
	unsigned int val = 0;

906 907
	mutex_lock(&loopback->cable_lock);
	cable = loopback->cables[kcontrol->id.subdevice][kcontrol->id.device ^ 1];
908 909 910 911 912
	if (cable != NULL) {
		unsigned int running = cable->running ^ cable->pause;

		val = (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ? 1 : 0;
	}
913
	mutex_unlock(&loopback->cable_lock);
914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955
	ucontrol->value.integer.value[0] = val;
	return 0;
}

static int loopback_format_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 = SNDRV_PCM_FORMAT_LAST;
	uinfo->value.integer.step = 1;
	return 0;
}                                  

static int loopback_format_get(struct snd_kcontrol *kcontrol,
			       struct snd_ctl_elem_value *ucontrol)
{
	struct loopback *loopback = snd_kcontrol_chip(kcontrol);
	
	ucontrol->value.integer.value[0] =
		loopback->setup[kcontrol->id.subdevice]
			       [kcontrol->id.device].format;
	return 0;
}

static int loopback_rate_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 = 192000;
	uinfo->value.integer.step = 1;
	return 0;
}                                  

static int loopback_rate_get(struct snd_kcontrol *kcontrol,
			     struct snd_ctl_elem_value *ucontrol)
{
	struct loopback *loopback = snd_kcontrol_chip(kcontrol);
	
956
	mutex_lock(&loopback->cable_lock);
957 958 959
	ucontrol->value.integer.value[0] =
		loopback->setup[kcontrol->id.subdevice]
			       [kcontrol->id.device].rate;
960
	mutex_unlock(&loopback->cable_lock);
961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979
	return 0;
}

static int loopback_channels_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 = 1;
	uinfo->value.integer.max = 1024;
	uinfo->value.integer.step = 1;
	return 0;
}                                  

static int loopback_channels_get(struct snd_kcontrol *kcontrol,
				 struct snd_ctl_elem_value *ucontrol)
{
	struct loopback *loopback = snd_kcontrol_chip(kcontrol);
	
980
	mutex_lock(&loopback->cable_lock);
981 982
	ucontrol->value.integer.value[0] =
		loopback->setup[kcontrol->id.subdevice]
983
			       [kcontrol->id.device].channels;
984
	mutex_unlock(&loopback->cable_lock);
985 986 987
	return 0;
}

988
static struct snd_kcontrol_new loopback_controls[]  = {
989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
{
	.iface =        SNDRV_CTL_ELEM_IFACE_PCM,
	.name =         "PCM Rate Shift 100000",
	.info =         loopback_rate_shift_info,
	.get =          loopback_rate_shift_get,
	.put =          loopback_rate_shift_put,
},
{
	.iface =        SNDRV_CTL_ELEM_IFACE_PCM,
	.name =         "PCM Notify",
	.info =         snd_ctl_boolean_mono_info,
	.get =          loopback_notify_get,
	.put =          loopback_notify_put,
},
#define ACTIVE_IDX 2
{
	.access =	SNDRV_CTL_ELEM_ACCESS_READ,
	.iface =        SNDRV_CTL_ELEM_IFACE_PCM,
	.name =         "PCM Slave Active",
	.info =         snd_ctl_boolean_mono_info,
	.get =          loopback_active_get,
},
#define FORMAT_IDX 3
{
	.access =	SNDRV_CTL_ELEM_ACCESS_READ,
	.iface =        SNDRV_CTL_ELEM_IFACE_PCM,
	.name =         "PCM Slave Format",
	.info =         loopback_format_info,
	.get =          loopback_format_get
},
#define RATE_IDX 4
{
	.access =	SNDRV_CTL_ELEM_ACCESS_READ,
	.iface =        SNDRV_CTL_ELEM_IFACE_PCM,
	.name =         "PCM Slave Rate",
	.info =         loopback_rate_info,
	.get =          loopback_rate_get
},
#define CHANNELS_IDX 5
{
	.access =	SNDRV_CTL_ELEM_ACCESS_READ,
	.iface =        SNDRV_CTL_ELEM_IFACE_PCM,
	.name =         "PCM Slave Channels",
	.info =         loopback_channels_info,
	.get =          loopback_channels_get
}
};

1037
static int loopback_mixer_new(struct loopback *loopback, int notify)
1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089
{
	struct snd_card *card = loopback->card;
	struct snd_pcm *pcm;
	struct snd_kcontrol *kctl;
	struct loopback_setup *setup;
	int err, dev, substr, substr_count, idx;

	strcpy(card->mixername, "Loopback Mixer");
	for (dev = 0; dev < 2; dev++) {
		pcm = loopback->pcm[dev];
		substr_count =
		    pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count;
		for (substr = 0; substr < substr_count; substr++) {
			setup = &loopback->setup[substr][dev];
			setup->notify = notify;
			setup->rate_shift = NO_PITCH;
			setup->format = SNDRV_PCM_FORMAT_S16_LE;
			setup->rate = 48000;
			setup->channels = 2;
			for (idx = 0; idx < ARRAY_SIZE(loopback_controls);
									idx++) {
				kctl = snd_ctl_new1(&loopback_controls[idx],
						    loopback);
				if (!kctl)
					return -ENOMEM;
				kctl->id.device = dev;
				kctl->id.subdevice = substr;
				switch (idx) {
				case ACTIVE_IDX:
					setup->active_id = kctl->id;
					break;
				case FORMAT_IDX:
					setup->format_id = kctl->id;
					break;
				case RATE_IDX:
					setup->rate_id = kctl->id;
					break;
				case CHANNELS_IDX:
					setup->channels_id = kctl->id;
					break;
				default:
					break;
				}
				err = snd_ctl_add(card, kctl);
				if (err < 0)
					return err;
			}
		}
	}
	return 0;
}

1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128
static void print_dpcm_info(struct snd_info_buffer *buffer,
			    struct loopback_pcm *dpcm,
			    const char *id)
{
	snd_iprintf(buffer, "  %s\n", id);
	if (dpcm == NULL) {
		snd_iprintf(buffer, "    inactive\n");
		return;
	}
	snd_iprintf(buffer, "    buffer_size:\t%u\n", dpcm->pcm_buffer_size);
	snd_iprintf(buffer, "    buffer_pos:\t\t%u\n", dpcm->buf_pos);
	snd_iprintf(buffer, "    silent_size:\t%u\n", dpcm->silent_size);
	snd_iprintf(buffer, "    period_size:\t%u\n", dpcm->pcm_period_size);
	snd_iprintf(buffer, "    bytes_per_sec:\t%u\n", dpcm->pcm_bps);
	snd_iprintf(buffer, "    sample_align:\t%u\n", dpcm->pcm_salign);
	snd_iprintf(buffer, "    rate_shift:\t\t%u\n", dpcm->pcm_rate_shift);
	snd_iprintf(buffer, "    update_pending:\t%u\n",
						dpcm->period_update_pending);
	snd_iprintf(buffer, "    irq_pos:\t\t%u\n", dpcm->irq_pos);
	snd_iprintf(buffer, "    period_frac:\t%u\n", dpcm->period_size_frac);
	snd_iprintf(buffer, "    last_jiffies:\t%lu (%lu)\n",
					dpcm->last_jiffies, jiffies);
	snd_iprintf(buffer, "    timer_expires:\t%lu\n", dpcm->timer.expires);
}

static void print_substream_info(struct snd_info_buffer *buffer,
				 struct loopback *loopback,
				 int sub,
				 int num)
{
	struct loopback_cable *cable = loopback->cables[sub][num];

	snd_iprintf(buffer, "Cable %i substream %i:\n", num, sub);
	if (cable == NULL) {
		snd_iprintf(buffer, "  inactive\n");
		return;
	}
	snd_iprintf(buffer, "  valid: %u\n", cable->valid);
	snd_iprintf(buffer, "  running: %u\n", cable->running);
1129
	snd_iprintf(buffer, "  pause: %u\n", cable->pause);
1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147
	print_dpcm_info(buffer, cable->streams[0], "Playback");
	print_dpcm_info(buffer, cable->streams[1], "Capture");
}

static void print_cable_info(struct snd_info_entry *entry,
			     struct snd_info_buffer *buffer)
{
	struct loopback *loopback = entry->private_data;
	int sub, num;

	mutex_lock(&loopback->cable_lock);
	num = entry->name[strlen(entry->name)-1];
	num = num == '0' ? 0 : 1;
	for (sub = 0; sub < MAX_PCM_SUBSTREAMS; sub++)
		print_substream_info(buffer, loopback, sub, num);
	mutex_unlock(&loopback->cable_lock);
}

1148
static int loopback_proc_new(struct loopback *loopback, int cidx)
1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162
{
	char name[32];
	struct snd_info_entry *entry;
	int err;

	snprintf(name, sizeof(name), "cable#%d", cidx);
	err = snd_card_proc_new(loopback->card, name, &entry);
	if (err < 0)
		return err;

	snd_info_set_text_ops(entry, loopback, print_cable_info);
	return 0;
}

1163
static int loopback_probe(struct platform_device *devptr)
1164 1165 1166 1167 1168 1169
{
	struct snd_card *card;
	struct loopback *loopback;
	int dev = devptr->id;
	int err;

1170 1171
	err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
			   sizeof(struct loopback), &card);
1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192
	if (err < 0)
		return err;
	loopback = card->private_data;

	if (pcm_substreams[dev] < 1)
		pcm_substreams[dev] = 1;
	if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
		pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
	
	loopback->card = card;
	mutex_init(&loopback->cable_lock);

	err = loopback_pcm_new(loopback, 0, pcm_substreams[dev]);
	if (err < 0)
		goto __nodev;
	err = loopback_pcm_new(loopback, 1, pcm_substreams[dev]);
	if (err < 0)
		goto __nodev;
	err = loopback_mixer_new(loopback, pcm_notify[dev] ? 1 : 0);
	if (err < 0)
		goto __nodev;
1193 1194
	loopback_proc_new(loopback, 0);
	loopback_proc_new(loopback, 1);
1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207
	strcpy(card->driver, "Loopback");
	strcpy(card->shortname, "Loopback");
	sprintf(card->longname, "Loopback %i", dev + 1);
	err = snd_card_register(card);
	if (!err) {
		platform_set_drvdata(devptr, card);
		return 0;
	}
      __nodev:
	snd_card_free(card);
	return err;
}

1208
static int loopback_remove(struct platform_device *devptr)
1209 1210 1211 1212 1213
{
	snd_card_free(platform_get_drvdata(devptr));
	return 0;
}

1214
#ifdef CONFIG_PM_SLEEP
1215
static int loopback_suspend(struct device *pdev)
1216
{
1217
	struct snd_card *card = dev_get_drvdata(pdev);
1218 1219 1220 1221 1222 1223 1224 1225 1226
	struct loopback *loopback = card->private_data;

	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);

	snd_pcm_suspend_all(loopback->pcm[0]);
	snd_pcm_suspend_all(loopback->pcm[1]);
	return 0;
}
	
1227
static int loopback_resume(struct device *pdev)
1228
{
1229
	struct snd_card *card = dev_get_drvdata(pdev);
1230 1231 1232 1233

	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
	return 0;
}
1234 1235 1236 1237 1238

static SIMPLE_DEV_PM_OPS(loopback_pm, loopback_suspend, loopback_resume);
#define LOOPBACK_PM_OPS	&loopback_pm
#else
#define LOOPBACK_PM_OPS	NULL
1239 1240 1241 1242 1243 1244
#endif

#define SND_LOOPBACK_DRIVER	"snd_aloop"

static struct platform_driver loopback_driver = {
	.probe		= loopback_probe,
1245
	.remove		= loopback_remove,
1246
	.driver		= {
1247
		.name	= SND_LOOPBACK_DRIVER,
1248
		.pm	= LOOPBACK_PM_OPS,
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	},
};

static void loopback_unregister_all(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(devices); ++i)
		platform_device_unregister(devices[i]);
	platform_driver_unregister(&loopback_driver);
}

static int __init alsa_card_loopback_init(void)
{
	int i, err, cards;

	err = platform_driver_register(&loopback_driver);
	if (err < 0)
		return err;


	cards = 0;
	for (i = 0; i < SNDRV_CARDS; i++) {
		struct platform_device *device;
		if (!enable[i])
			continue;
		device = platform_device_register_simple(SND_LOOPBACK_DRIVER,
							 i, NULL, 0);
		if (IS_ERR(device))
			continue;
		if (!platform_get_drvdata(device)) {
			platform_device_unregister(device);
			continue;
		}
		devices[i] = device;
		cards++;
	}
	if (!cards) {
#ifdef MODULE
		printk(KERN_ERR "aloop: No loopback enabled\n");
#endif
		loopback_unregister_all();
		return -ENODEV;
	}
	return 0;
}

static void __exit alsa_card_loopback_exit(void)
{
	loopback_unregister_all();
}

module_init(alsa_card_loopback_init)
module_exit(alsa_card_loopback_exit)