pcm_native.c 98.2 KB
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/*
 *  Digital Audio (PCM) abstract layer
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 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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 *
 *
 *   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/mm.h>
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#include <linux/module.h>
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#include <linux/file.h>
#include <linux/slab.h>
#include <linux/time.h>
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#include <linux/pm_qos.h>
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#include <linux/aio.h>
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#include <linux/dma-mapping.h>
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#include <sound/core.h>
#include <sound/control.h>
#include <sound/info.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/timer.h>
#include <sound/minors.h>
#include <asm/io.h>
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#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
#include <dma-coherence.h>
#endif
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/*
 *  Compatibility
 */

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struct snd_pcm_hw_params_old {
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	unsigned int flags;
	unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
			   SNDRV_PCM_HW_PARAM_ACCESS + 1];
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	struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
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					SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
	unsigned int rmask;
	unsigned int cmask;
	unsigned int info;
	unsigned int msbits;
	unsigned int rate_num;
	unsigned int rate_den;
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	snd_pcm_uframes_t fifo_size;
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	unsigned char reserved[64];
};

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#ifdef CONFIG_SND_SUPPORT_OLD_API
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#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
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static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
				      struct snd_pcm_hw_params_old __user * _oparams);
static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
				      struct snd_pcm_hw_params_old __user * _oparams);
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#endif
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static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
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/*
 *
 */

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static DEFINE_RWLOCK(snd_pcm_link_rwlock);
static DECLARE_RWSEM(snd_pcm_link_rwsem);
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void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
{
	if (substream->pcm->nonatomic) {
		down_read(&snd_pcm_link_rwsem);
		mutex_lock(&substream->self_group.mutex);
	} else {
		read_lock(&snd_pcm_link_rwlock);
		spin_lock(&substream->self_group.lock);
	}
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);

void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
{
	if (substream->pcm->nonatomic) {
		mutex_unlock(&substream->self_group.mutex);
		up_read(&snd_pcm_link_rwsem);
	} else {
		spin_unlock(&substream->self_group.lock);
		read_unlock(&snd_pcm_link_rwlock);
	}
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);

void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
{
	if (!substream->pcm->nonatomic)
		local_irq_disable();
	snd_pcm_stream_lock(substream);
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);

void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
{
	snd_pcm_stream_unlock(substream);
	if (!substream->pcm->nonatomic)
		local_irq_enable();
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);

unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
{
	unsigned long flags = 0;
	if (!substream->pcm->nonatomic)
		local_irq_save(flags);
	snd_pcm_stream_lock(substream);
	return flags;
}
EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);

void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
				      unsigned long flags)
{
	snd_pcm_stream_unlock(substream);
	if (!substream->pcm->nonatomic)
		local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
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static inline mm_segment_t snd_enter_user(void)
{
	mm_segment_t fs = get_fs();
	set_fs(get_ds());
	return fs;
}

static inline void snd_leave_user(mm_segment_t fs)
{
	set_fs(fs);
}



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int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
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{
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	struct snd_pcm_runtime *runtime;
	struct snd_pcm *pcm = substream->pcm;
	struct snd_pcm_str *pstr = substream->pstr;
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	memset(info, 0, sizeof(*info));
	info->card = pcm->card->number;
	info->device = pcm->device;
	info->stream = substream->stream;
	info->subdevice = substream->number;
	strlcpy(info->id, pcm->id, sizeof(info->id));
	strlcpy(info->name, pcm->name, sizeof(info->name));
	info->dev_class = pcm->dev_class;
	info->dev_subclass = pcm->dev_subclass;
	info->subdevices_count = pstr->substream_count;
	info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
	strlcpy(info->subname, substream->name, sizeof(info->subname));
	runtime = substream->runtime;
	/* AB: FIXME!!! This is definitely nonsense */
	if (runtime) {
		info->sync = runtime->sync;
		substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
	}
	return 0;
}

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int snd_pcm_info_user(struct snd_pcm_substream *substream,
		      struct snd_pcm_info __user * _info)
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{
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	struct snd_pcm_info *info;
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	int err;

	info = kmalloc(sizeof(*info), GFP_KERNEL);
	if (! info)
		return -ENOMEM;
	err = snd_pcm_info(substream, info);
	if (err >= 0) {
		if (copy_to_user(_info, info, sizeof(*info)))
			err = -EFAULT;
	}
	kfree(info);
	return err;
}

#undef RULES_DEBUG

#ifdef RULES_DEBUG
#define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
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static const char * const snd_pcm_hw_param_names[] = {
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	HW_PARAM(ACCESS),
	HW_PARAM(FORMAT),
	HW_PARAM(SUBFORMAT),
	HW_PARAM(SAMPLE_BITS),
	HW_PARAM(FRAME_BITS),
	HW_PARAM(CHANNELS),
	HW_PARAM(RATE),
	HW_PARAM(PERIOD_TIME),
	HW_PARAM(PERIOD_SIZE),
	HW_PARAM(PERIOD_BYTES),
	HW_PARAM(PERIODS),
	HW_PARAM(BUFFER_TIME),
	HW_PARAM(BUFFER_SIZE),
	HW_PARAM(BUFFER_BYTES),
	HW_PARAM(TICK_TIME),
};
#endif

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int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 
		      struct snd_pcm_hw_params *params)
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{
	unsigned int k;
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	struct snd_pcm_hardware *hw;
	struct snd_interval *i = NULL;
	struct snd_mask *m = NULL;
	struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
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	unsigned int rstamps[constrs->rules_num];
	unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
	unsigned int stamp = 2;
	int changed, again;

	params->info = 0;
	params->fifo_size = 0;
	if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
		params->msbits = 0;
	if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
		params->rate_num = 0;
		params->rate_den = 0;
	}

	for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
		m = hw_param_mask(params, k);
		if (snd_mask_empty(m))
			return -EINVAL;
		if (!(params->rmask & (1 << k)))
			continue;
#ifdef RULES_DEBUG
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		pr_debug("%s = ", snd_pcm_hw_param_names[k]);
		pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
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#endif
		changed = snd_mask_refine(m, constrs_mask(constrs, k));
#ifdef RULES_DEBUG
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		pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
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#endif
		if (changed)
			params->cmask |= 1 << k;
		if (changed < 0)
			return changed;
	}

	for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
		i = hw_param_interval(params, k);
		if (snd_interval_empty(i))
			return -EINVAL;
		if (!(params->rmask & (1 << k)))
			continue;
#ifdef RULES_DEBUG
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		pr_debug("%s = ", snd_pcm_hw_param_names[k]);
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		if (i->empty)
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			pr_cont("empty");
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		else
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			pr_cont("%c%u %u%c",
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			       i->openmin ? '(' : '[', i->min,
			       i->max, i->openmax ? ')' : ']');
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		pr_cont(" -> ");
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#endif
		changed = snd_interval_refine(i, constrs_interval(constrs, k));
#ifdef RULES_DEBUG
		if (i->empty)
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			pr_cont("empty\n");
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		else 
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			pr_cont("%c%u %u%c\n",
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			       i->openmin ? '(' : '[', i->min,
			       i->max, i->openmax ? ')' : ']');
#endif
		if (changed)
			params->cmask |= 1 << k;
		if (changed < 0)
			return changed;
	}

	for (k = 0; k < constrs->rules_num; k++)
		rstamps[k] = 0;
	for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 
		vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
	do {
		again = 0;
		for (k = 0; k < constrs->rules_num; k++) {
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			struct snd_pcm_hw_rule *r = &constrs->rules[k];
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			unsigned int d;
			int doit = 0;
			if (r->cond && !(r->cond & params->flags))
				continue;
			for (d = 0; r->deps[d] >= 0; d++) {
				if (vstamps[r->deps[d]] > rstamps[k]) {
					doit = 1;
					break;
				}
			}
			if (!doit)
				continue;
#ifdef RULES_DEBUG
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			pr_debug("Rule %d [%p]: ", k, r->func);
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			if (r->var >= 0) {
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				pr_cont("%s = ", snd_pcm_hw_param_names[r->var]);
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				if (hw_is_mask(r->var)) {
					m = hw_param_mask(params, r->var);
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					pr_cont("%x", *m->bits);
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				} else {
					i = hw_param_interval(params, r->var);
					if (i->empty)
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						pr_cont("empty");
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					else
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						pr_cont("%c%u %u%c",
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						       i->openmin ? '(' : '[', i->min,
						       i->max, i->openmax ? ')' : ']');
				}
			}
#endif
			changed = r->func(params, r);
#ifdef RULES_DEBUG
			if (r->var >= 0) {
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				pr_cont(" -> ");
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				if (hw_is_mask(r->var))
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					pr_cont("%x", *m->bits);
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				else {
					if (i->empty)
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						pr_cont("empty");
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					else
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						pr_cont("%c%u %u%c",
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						       i->openmin ? '(' : '[', i->min,
						       i->max, i->openmax ? ')' : ']');
				}
			}
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			pr_cont("\n");
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#endif
			rstamps[k] = stamp;
			if (changed && r->var >= 0) {
				params->cmask |= (1 << r->var);
				vstamps[r->var] = stamp;
				again = 1;
			}
			if (changed < 0)
				return changed;
			stamp++;
		}
	} while (again);
	if (!params->msbits) {
		i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
		if (snd_interval_single(i))
			params->msbits = snd_interval_value(i);
	}

	if (!params->rate_den) {
		i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
		if (snd_interval_single(i)) {
			params->rate_num = snd_interval_value(i);
			params->rate_den = 1;
		}
	}

	hw = &substream->runtime->hw;
	if (!params->info)
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		params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
	if (!params->fifo_size) {
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		m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
		i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
		if (snd_mask_min(m) == snd_mask_max(m) &&
                    snd_interval_min(i) == snd_interval_max(i)) {
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			changed = substream->ops->ioctl(substream,
					SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
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			if (changed < 0)
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				return changed;
		}
	}
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	params->rmask = 0;
	return 0;
}

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EXPORT_SYMBOL(snd_pcm_hw_refine);

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static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
				  struct snd_pcm_hw_params __user * _params)
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{
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	struct snd_pcm_hw_params *params;
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	int err;

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	params = memdup_user(_params, sizeof(*params));
	if (IS_ERR(params))
		return PTR_ERR(params);

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	err = snd_pcm_hw_refine(substream, params);
	if (copy_to_user(_params, params, sizeof(*params))) {
		if (!err)
			err = -EFAULT;
	}
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	kfree(params);
	return err;
}

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static int period_to_usecs(struct snd_pcm_runtime *runtime)
{
	int usecs;

	if (! runtime->rate)
		return -1; /* invalid */

	/* take 75% of period time as the deadline */
	usecs = (750000 / runtime->rate) * runtime->period_size;
	usecs += ((750000 % runtime->rate) * runtime->period_size) /
		runtime->rate;

	return usecs;
}

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static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
{
	snd_pcm_stream_lock_irq(substream);
	if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
		substream->runtime->status->state = state;
	snd_pcm_stream_unlock_irq(substream);
}

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static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
			     struct snd_pcm_hw_params *params)
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{
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	struct snd_pcm_runtime *runtime;
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	int err, usecs;
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	unsigned int bits;
	snd_pcm_uframes_t frames;

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	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
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	runtime = substream->runtime;
	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_OPEN:
	case SNDRV_PCM_STATE_SETUP:
	case SNDRV_PCM_STATE_PREPARED:
		break;
	default:
		snd_pcm_stream_unlock_irq(substream);
		return -EBADFD;
	}
	snd_pcm_stream_unlock_irq(substream);
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#if IS_ENABLED(CONFIG_SND_PCM_OSS)
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	if (!substream->oss.oss)
#endif
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		if (atomic_read(&substream->mmap_count))
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			return -EBADFD;

	params->rmask = ~0U;
	err = snd_pcm_hw_refine(substream, params);
	if (err < 0)
		goto _error;

	err = snd_pcm_hw_params_choose(substream, params);
	if (err < 0)
		goto _error;

	if (substream->ops->hw_params != NULL) {
		err = substream->ops->hw_params(substream, params);
		if (err < 0)
			goto _error;
	}

	runtime->access = params_access(params);
	runtime->format = params_format(params);
	runtime->subformat = params_subformat(params);
	runtime->channels = params_channels(params);
	runtime->rate = params_rate(params);
	runtime->period_size = params_period_size(params);
	runtime->periods = params_periods(params);
	runtime->buffer_size = params_buffer_size(params);
	runtime->info = params->info;
	runtime->rate_num = params->rate_num;
	runtime->rate_den = params->rate_den;
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	runtime->no_period_wakeup =
			(params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
			(params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
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	bits = snd_pcm_format_physical_width(runtime->format);
	runtime->sample_bits = bits;
	bits *= runtime->channels;
	runtime->frame_bits = bits;
	frames = 1;
	while (bits % 8 != 0) {
		bits *= 2;
		frames *= 2;
	}
	runtime->byte_align = bits / 8;
	runtime->min_align = frames;

	/* Default sw params */
	runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
	runtime->period_step = 1;
	runtime->control->avail_min = runtime->period_size;
	runtime->start_threshold = 1;
	runtime->stop_threshold = runtime->buffer_size;
	runtime->silence_threshold = 0;
	runtime->silence_size = 0;
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	runtime->boundary = runtime->buffer_size;
	while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
		runtime->boundary *= 2;
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	snd_pcm_timer_resolution_change(substream);
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	snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
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	if (pm_qos_request_active(&substream->latency_pm_qos_req))
		pm_qos_remove_request(&substream->latency_pm_qos_req);
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	if ((usecs = period_to_usecs(runtime)) >= 0)
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		pm_qos_add_request(&substream->latency_pm_qos_req,
				   PM_QOS_CPU_DMA_LATENCY, usecs);
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	return 0;
 _error:
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	/* hardware might be unusable from this time,
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	   so we force application to retry to set
	   the correct hardware parameter settings */
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	snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
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	if (substream->ops->hw_free != NULL)
		substream->ops->hw_free(substream);
	return err;
}

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static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
				  struct snd_pcm_hw_params __user * _params)
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{
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	struct snd_pcm_hw_params *params;
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	int err;

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	params = memdup_user(_params, sizeof(*params));
	if (IS_ERR(params))
		return PTR_ERR(params);

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	err = snd_pcm_hw_params(substream, params);
	if (copy_to_user(_params, params, sizeof(*params))) {
		if (!err)
			err = -EFAULT;
	}
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	kfree(params);
	return err;
}

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static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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	struct snd_pcm_runtime *runtime;
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	int result = 0;

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	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
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	runtime = substream->runtime;
	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_SETUP:
	case SNDRV_PCM_STATE_PREPARED:
		break;
	default:
		snd_pcm_stream_unlock_irq(substream);
		return -EBADFD;
	}
	snd_pcm_stream_unlock_irq(substream);
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	if (atomic_read(&substream->mmap_count))
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		return -EBADFD;
	if (substream->ops->hw_free)
		result = substream->ops->hw_free(substream);
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	snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
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	pm_qos_remove_request(&substream->latency_pm_qos_req);
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	return result;
}

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static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
			     struct snd_pcm_sw_params *params)
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{
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	struct snd_pcm_runtime *runtime;
589
	int err;
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	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
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	runtime = substream->runtime;
	snd_pcm_stream_lock_irq(substream);
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
		snd_pcm_stream_unlock_irq(substream);
		return -EBADFD;
	}
	snd_pcm_stream_unlock_irq(substream);

	if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
		return -EINVAL;
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	if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
	    params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
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		return -EINVAL;
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	if (params->avail_min == 0)
		return -EINVAL;
	if (params->silence_size >= runtime->boundary) {
		if (params->silence_threshold != 0)
			return -EINVAL;
	} else {
		if (params->silence_size > params->silence_threshold)
			return -EINVAL;
		if (params->silence_threshold > runtime->buffer_size)
			return -EINVAL;
	}
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	err = 0;
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	snd_pcm_stream_lock_irq(substream);
	runtime->tstamp_mode = params->tstamp_mode;
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	if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
		runtime->tstamp_type = params->tstamp_type;
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	runtime->period_step = params->period_step;
	runtime->control->avail_min = params->avail_min;
	runtime->start_threshold = params->start_threshold;
	runtime->stop_threshold = params->stop_threshold;
	runtime->silence_threshold = params->silence_threshold;
	runtime->silence_size = params->silence_size;
        params->boundary = runtime->boundary;
	if (snd_pcm_running(substream)) {
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
		    runtime->silence_size > 0)
			snd_pcm_playback_silence(substream, ULONG_MAX);
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		err = snd_pcm_update_state(substream, runtime);
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	}
	snd_pcm_stream_unlock_irq(substream);
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	return err;
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}

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static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
				  struct snd_pcm_sw_params __user * _params)
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{
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	struct snd_pcm_sw_params params;
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	int err;
	if (copy_from_user(&params, _params, sizeof(params)))
		return -EFAULT;
	err = snd_pcm_sw_params(substream, &params);
	if (copy_to_user(_params, &params, sizeof(params)))
		return -EFAULT;
	return err;
}

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int snd_pcm_status(struct snd_pcm_substream *substream,
		   struct snd_pcm_status *status)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	snd_pcm_stream_lock_irq(substream);
	status->state = runtime->status->state;
	status->suspended_state = runtime->status->suspended_state;
	if (status->state == SNDRV_PCM_STATE_OPEN)
		goto _end;
	status->trigger_tstamp = runtime->trigger_tstamp;
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	if (snd_pcm_running(substream)) {
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		snd_pcm_update_hw_ptr(substream);
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		if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
			status->tstamp = runtime->status->tstamp;
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			status->audio_tstamp =
				runtime->status->audio_tstamp;
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			goto _tstamp_end;
		}
	}
672
	snd_pcm_gettime(runtime, &status->tstamp);
673
 _tstamp_end:
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	status->appl_ptr = runtime->control->appl_ptr;
	status->hw_ptr = runtime->status->hw_ptr;
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		status->avail = snd_pcm_playback_avail(runtime);
		if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
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		    runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
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			status->delay = runtime->buffer_size - status->avail;
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			status->delay += runtime->delay;
		} else
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			status->delay = 0;
	} else {
		status->avail = snd_pcm_capture_avail(runtime);
		if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
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			status->delay = status->avail + runtime->delay;
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		else
			status->delay = 0;
	}
	status->avail_max = runtime->avail_max;
	status->overrange = runtime->overrange;
	runtime->avail_max = 0;
	runtime->overrange = 0;
 _end:
 	snd_pcm_stream_unlock_irq(substream);
	return 0;
}

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static int snd_pcm_status_user(struct snd_pcm_substream *substream,
			       struct snd_pcm_status __user * _status)
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{
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	struct snd_pcm_status status;
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	int res;
	
	memset(&status, 0, sizeof(status));
	res = snd_pcm_status(substream, &status);
	if (res < 0)
		return res;
	if (copy_to_user(_status, &status, sizeof(status)))
		return -EFAULT;
	return 0;
}

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static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
				struct snd_pcm_channel_info * info)
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{
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	struct snd_pcm_runtime *runtime;
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	unsigned int channel;
	
	channel = info->channel;
	runtime = substream->runtime;
	snd_pcm_stream_lock_irq(substream);
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
		snd_pcm_stream_unlock_irq(substream);
		return -EBADFD;
	}
	snd_pcm_stream_unlock_irq(substream);
	if (channel >= runtime->channels)
		return -EINVAL;
	memset(info, 0, sizeof(*info));
	info->channel = channel;
	return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
}

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static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
				     struct snd_pcm_channel_info __user * _info)
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{
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	struct snd_pcm_channel_info info;
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	int res;
	
	if (copy_from_user(&info, _info, sizeof(info)))
		return -EFAULT;
	res = snd_pcm_channel_info(substream, &info);
	if (res < 0)
		return res;
	if (copy_to_user(_info, &info, sizeof(info)))
		return -EFAULT;
	return 0;
}

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static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	if (runtime->trigger_master == NULL)
		return;
	if (runtime->trigger_master == substream) {
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		snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
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	} else {
		snd_pcm_trigger_tstamp(runtime->trigger_master);
		runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
	}
	runtime->trigger_master = NULL;
}

struct action_ops {
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	int (*pre_action)(struct snd_pcm_substream *substream, int state);
	int (*do_action)(struct snd_pcm_substream *substream, int state);
	void (*undo_action)(struct snd_pcm_substream *substream, int state);
	void (*post_action)(struct snd_pcm_substream *substream, int state);
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};

/*
 *  this functions is core for handling of linked stream
 *  Note: the stream state might be changed also on failure
 *  Note2: call with calling stream lock + link lock
 */
static int snd_pcm_action_group(struct action_ops *ops,
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				struct snd_pcm_substream *substream,
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				int state, int do_lock)
{
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	struct snd_pcm_substream *s = NULL;
	struct snd_pcm_substream *s1;
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	int res = 0;

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	snd_pcm_group_for_each_entry(s, substream) {
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		if (do_lock && s != substream) {
			if (s->pcm->nonatomic)
				mutex_lock_nested(&s->self_group.mutex,
						  SINGLE_DEPTH_NESTING);
			else
				spin_lock_nested(&s->self_group.lock,
						 SINGLE_DEPTH_NESTING);
		}
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		res = ops->pre_action(s, state);
		if (res < 0)
			goto _unlock;
	}
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	snd_pcm_group_for_each_entry(s, substream) {
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		res = ops->do_action(s, state);
		if (res < 0) {
			if (ops->undo_action) {
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				snd_pcm_group_for_each_entry(s1, substream) {
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					if (s1 == s) /* failed stream */
						break;
					ops->undo_action(s1, state);
				}
			}
			s = NULL; /* unlock all */
			goto _unlock;
		}
	}
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	snd_pcm_group_for_each_entry(s, substream) {
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		ops->post_action(s, state);
	}
 _unlock:
	if (do_lock) {
		/* unlock streams */
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		snd_pcm_group_for_each_entry(s1, substream) {
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			if (s1 != substream) {
				if (s->pcm->nonatomic)
					mutex_unlock(&s1->self_group.mutex);
				else
					spin_unlock(&s1->self_group.lock);
			}
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			if (s1 == s)	/* end */
				break;
		}
	}
	return res;
}

/*
 *  Note: call with stream lock
 */
static int snd_pcm_action_single(struct action_ops *ops,
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				 struct snd_pcm_substream *substream,
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				 int state)
{
	int res;
	
	res = ops->pre_action(substream, state);
	if (res < 0)
		return res;
	res = ops->do_action(substream, state);
	if (res == 0)
		ops->post_action(substream, state);
	else if (ops->undo_action)
		ops->undo_action(substream, state);
	return res;
}

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/* call in mutex-protected context */
static int snd_pcm_action_mutex(struct action_ops *ops,
				struct snd_pcm_substream *substream,
				int state)
{
	int res;

	if (snd_pcm_stream_linked(substream)) {
		if (!mutex_trylock(&substream->group->mutex)) {
			mutex_unlock(&substream->self_group.mutex);
			mutex_lock(&substream->group->mutex);
			mutex_lock(&substream->self_group.mutex);
		}
		res = snd_pcm_action_group(ops, substream, state, 1);
		mutex_unlock(&substream->group->mutex);
	} else {
		res = snd_pcm_action_single(ops, substream, state);
	}
	return res;
}

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/*
 *  Note: call with stream lock
 */
static int snd_pcm_action(struct action_ops *ops,
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			  struct snd_pcm_substream *substream,
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			  int state)
{
	int res;

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	if (substream->pcm->nonatomic)
		return snd_pcm_action_mutex(ops, substream, state);

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	if (snd_pcm_stream_linked(substream)) {
		if (!spin_trylock(&substream->group->lock)) {
			spin_unlock(&substream->self_group.lock);
			spin_lock(&substream->group->lock);
			spin_lock(&substream->self_group.lock);
		}
		res = snd_pcm_action_group(ops, substream, state, 1);
		spin_unlock(&substream->group->lock);
	} else {
		res = snd_pcm_action_single(ops, substream, state);
	}
	return res;
}

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static int snd_pcm_action_lock_mutex(struct action_ops *ops,
				     struct snd_pcm_substream *substream,
				     int state)
{
	int res;

	down_read(&snd_pcm_link_rwsem);
	if (snd_pcm_stream_linked(substream)) {
		mutex_lock(&substream->group->mutex);
		mutex_lock_nested(&substream->self_group.mutex,
				  SINGLE_DEPTH_NESTING);
		res = snd_pcm_action_group(ops, substream, state, 1);
		mutex_unlock(&substream->self_group.mutex);
		mutex_unlock(&substream->group->mutex);
	} else {
		mutex_lock(&substream->self_group.mutex);
		res = snd_pcm_action_single(ops, substream, state);
		mutex_unlock(&substream->self_group.mutex);
	}
	up_read(&snd_pcm_link_rwsem);
	return res;
}

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/*
 *  Note: don't use any locks before
 */
static int snd_pcm_action_lock_irq(struct action_ops *ops,
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				   struct snd_pcm_substream *substream,
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				   int state)
{
	int res;

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	if (substream->pcm->nonatomic)
		return snd_pcm_action_lock_mutex(ops, substream, state);

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	read_lock_irq(&snd_pcm_link_rwlock);
	if (snd_pcm_stream_linked(substream)) {
		spin_lock(&substream->group->lock);
		spin_lock(&substream->self_group.lock);
		res = snd_pcm_action_group(ops, substream, state, 1);
		spin_unlock(&substream->self_group.lock);
		spin_unlock(&substream->group->lock);
	} else {
		spin_lock(&substream->self_group.lock);
		res = snd_pcm_action_single(ops, substream, state);
		spin_unlock(&substream->self_group.lock);
	}
	read_unlock_irq(&snd_pcm_link_rwlock);
	return res;
}

/*
 */
static int snd_pcm_action_nonatomic(struct action_ops *ops,
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				    struct snd_pcm_substream *substream,
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				    int state)
{
	int res;

	down_read(&snd_pcm_link_rwsem);
	if (snd_pcm_stream_linked(substream))
		res = snd_pcm_action_group(ops, substream, state, 0);
	else
		res = snd_pcm_action_single(ops, substream, state);
	up_read(&snd_pcm_link_rwsem);
	return res;
}

/*
 * start callbacks
 */
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static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
		return -EBADFD;
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
	    !snd_pcm_playback_data(substream))
		return -EPIPE;
	runtime->trigger_master = substream;
	return 0;
}

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static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
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{
	if (substream->runtime->trigger_master != substream)
		return 0;
	return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
}

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static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
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{
	if (substream->runtime->trigger_master == substream)
		substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
}

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static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	snd_pcm_trigger_tstamp(substream);
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	runtime->hw_ptr_jiffies = jiffies;
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	runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 
							    runtime->rate;
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	runtime->status->state = state;
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
	    runtime->silence_size > 0)
		snd_pcm_playback_silence(substream, ULONG_MAX);
	if (substream->timer)
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		snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
				 &runtime->trigger_tstamp);
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}

static struct action_ops snd_pcm_action_start = {
	.pre_action = snd_pcm_pre_start,
	.do_action = snd_pcm_do_start,
	.undo_action = snd_pcm_undo_start,
	.post_action = snd_pcm_post_start
};

/**
1020
 * snd_pcm_start - start all linked streams
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 * @substream: the PCM substream instance
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 *
 * Return: Zero if successful, or a negative error code.
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 */
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int snd_pcm_start(struct snd_pcm_substream *substream)
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{
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	return snd_pcm_action(&snd_pcm_action_start, substream,
			      SNDRV_PCM_STATE_RUNNING);
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}

/*
 * stop callbacks
 */
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static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
	runtime->trigger_master = substream;
	return 0;
}

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static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
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{
	if (substream->runtime->trigger_master == substream &&
	    snd_pcm_running(substream))
		substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
	return 0; /* unconditonally stop all substreams */
}

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static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	if (runtime->status->state != state) {
		snd_pcm_trigger_tstamp(substream);
		if (substream->timer)
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			snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
					 &runtime->trigger_tstamp);
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		runtime->status->state = state;
	}
	wake_up(&runtime->sleep);
1062
	wake_up(&runtime->tsleep);
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}

static struct action_ops snd_pcm_action_stop = {
	.pre_action = snd_pcm_pre_stop,
	.do_action = snd_pcm_do_stop,
	.post_action = snd_pcm_post_stop
};

/**
1072
 * snd_pcm_stop - try to stop all running streams in the substream group
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 * @substream: the PCM substream instance
 * @state: PCM state after stopping the stream
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 *
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 * The state of each stream is then changed to the given state unconditionally.
1077
 *
1078
 * Return: Zero if successful, or a negative error code.
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 */
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int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
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{
	return snd_pcm_action(&snd_pcm_action_stop, substream, state);
}

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EXPORT_SYMBOL(snd_pcm_stop);

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/**
1088
 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
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 * @substream: the PCM substream
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 *
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 * After stopping, the state is changed to SETUP.
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 * Unlike snd_pcm_stop(), this affects only the given stream.
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 *
 * Return: Zero if succesful, or a negative error code.
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 */
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int snd_pcm_drain_done(struct snd_pcm_substream *substream)
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{
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	return snd_pcm_action_single(&snd_pcm_action_stop, substream,
				     SNDRV_PCM_STATE_SETUP);
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}

/*
 * pause callbacks
 */
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static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
		return -ENOSYS;
	if (push) {
		if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
			return -EBADFD;
	} else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
		return -EBADFD;
	runtime->trigger_master = substream;
	return 0;
}

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static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
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{
	if (substream->runtime->trigger_master != substream)
		return 0;
1123 1124 1125 1126
	/* some drivers might use hw_ptr to recover from the pause -
	   update the hw_ptr now */
	if (push)
		snd_pcm_update_hw_ptr(substream);
1127
	/* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1128
	 * a delta between the current jiffies, this gives a large enough
1129 1130 1131
	 * delta, effectively to skip the check once.
	 */
	substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
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	return substream->ops->trigger(substream,
				       push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
					      SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
}

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static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
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{
	if (substream->runtime->trigger_master == substream)
		substream->ops->trigger(substream,
					push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
					SNDRV_PCM_TRIGGER_PAUSE_PUSH);
}

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static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	snd_pcm_trigger_tstamp(substream);
	if (push) {
		runtime->status->state = SNDRV_PCM_STATE_PAUSED;
		if (substream->timer)
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			snd_timer_notify(substream->timer,
					 SNDRV_TIMER_EVENT_MPAUSE,
					 &runtime->trigger_tstamp);
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		wake_up(&runtime->sleep);
1156
		wake_up(&runtime->tsleep);
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	} else {
		runtime->status->state = SNDRV_PCM_STATE_RUNNING;
		if (substream->timer)
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			snd_timer_notify(substream->timer,
					 SNDRV_TIMER_EVENT_MCONTINUE,
					 &runtime->trigger_tstamp);
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	}
}

static struct action_ops snd_pcm_action_pause = {
	.pre_action = snd_pcm_pre_pause,
	.do_action = snd_pcm_do_pause,
	.undo_action = snd_pcm_undo_pause,
	.post_action = snd_pcm_post_pause
};

/*
 * Push/release the pause for all linked streams.
 */
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static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
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{
	return snd_pcm_action(&snd_pcm_action_pause, substream, push);
}

#ifdef CONFIG_PM
/* suspend */

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static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
		return -EBUSY;
	runtime->trigger_master = substream;
	return 0;
}

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static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	if (runtime->trigger_master != substream)
		return 0;
	if (! snd_pcm_running(substream))
		return 0;
	substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
	return 0; /* suspend unconditionally */
}

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static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	snd_pcm_trigger_tstamp(substream);
	if (substream->timer)
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		snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
				 &runtime->trigger_tstamp);
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	runtime->status->suspended_state = runtime->status->state;
	runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
	wake_up(&runtime->sleep);
1214
	wake_up(&runtime->tsleep);
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}

static struct action_ops snd_pcm_action_suspend = {
	.pre_action = snd_pcm_pre_suspend,
	.do_action = snd_pcm_do_suspend,
	.post_action = snd_pcm_post_suspend
};

/**
1224
 * snd_pcm_suspend - trigger SUSPEND to all linked streams
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 * @substream: the PCM substream
L
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 *
 * After this call, all streams are changed to SUSPENDED state.
1228 1229 1230
 *
 * Return: Zero if successful (or @substream is %NULL), or a negative error
 * code.
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 */
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int snd_pcm_suspend(struct snd_pcm_substream *substream)
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{
	int err;
	unsigned long flags;

1237 1238 1239
	if (! substream)
		return 0;

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	snd_pcm_stream_lock_irqsave(substream, flags);
	err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
	snd_pcm_stream_unlock_irqrestore(substream, flags);
	return err;
}

1246 1247
EXPORT_SYMBOL(snd_pcm_suspend);

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/**
1249
 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
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 * @pcm: the PCM instance
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 *
 * After this call, all streams are changed to SUSPENDED state.
1253 1254
 *
 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
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 */
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int snd_pcm_suspend_all(struct snd_pcm *pcm)
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{
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	struct snd_pcm_substream *substream;
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	int stream, err = 0;

1261 1262 1263
	if (! pcm)
		return 0;

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	for (stream = 0; stream < 2; stream++) {
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		for (substream = pcm->streams[stream].substream;
		     substream; substream = substream->next) {
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			/* FIXME: the open/close code should lock this as well */
			if (substream->runtime == NULL)
				continue;
			err = snd_pcm_suspend(substream);
			if (err < 0 && err != -EBUSY)
				return err;
		}
	}
	return 0;
}

1278 1279
EXPORT_SYMBOL(snd_pcm_suspend_all);

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/* resume */

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static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
		return -ENOSYS;
	runtime->trigger_master = substream;
	return 0;
}

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static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	if (runtime->trigger_master != substream)
		return 0;
	/* DMA not running previously? */
	if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
	    (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
	     substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
		return 0;
	return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
}

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static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
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{
	if (substream->runtime->trigger_master == substream &&
	    snd_pcm_running(substream))
		substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
}

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static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	snd_pcm_trigger_tstamp(substream);
	if (substream->timer)
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		snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
				 &runtime->trigger_tstamp);
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	runtime->status->state = runtime->status->suspended_state;
}

static struct action_ops snd_pcm_action_resume = {
	.pre_action = snd_pcm_pre_resume,
	.do_action = snd_pcm_do_resume,
	.undo_action = snd_pcm_undo_resume,
	.post_action = snd_pcm_post_resume
};

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static int snd_pcm_resume(struct snd_pcm_substream *substream)
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{
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	struct snd_card *card = substream->pcm->card;
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	int res;

	snd_power_lock(card);
1334
	if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
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		res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
	snd_power_unlock(card);
	return res;
}

#else

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static int snd_pcm_resume(struct snd_pcm_substream *substream)
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{
	return -ENOSYS;
}

#endif /* CONFIG_PM */

/*
 * xrun ioctl
 *
 * Change the RUNNING stream(s) to XRUN state.
 */
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static int snd_pcm_xrun(struct snd_pcm_substream *substream)
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{
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	struct snd_card *card = substream->pcm->card;
	struct snd_pcm_runtime *runtime = substream->runtime;
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	int result;

	snd_power_lock(card);
	if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1362
		result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
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		if (result < 0)
			goto _unlock;
	}

	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_XRUN:
		result = 0;	/* already there */
		break;
	case SNDRV_PCM_STATE_RUNNING:
		result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
		break;
	default:
		result = -EBADFD;
	}
	snd_pcm_stream_unlock_irq(substream);
 _unlock:
	snd_power_unlock(card);
	return result;
}

/*
 * reset ioctl
 */
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static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_RUNNING:
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_PAUSED:
	case SNDRV_PCM_STATE_SUSPENDED:
		return 0;
	default:
		return -EBADFD;
	}
}

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static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
	if (err < 0)
		return err;
	runtime->hw_ptr_base = 0;
1408 1409
	runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
		runtime->status->hw_ptr % runtime->period_size;
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	runtime->silence_start = runtime->status->hw_ptr;
	runtime->silence_filled = 0;
	return 0;
}

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static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	runtime->control->appl_ptr = runtime->status->hw_ptr;
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
	    runtime->silence_size > 0)
		snd_pcm_playback_silence(substream, ULONG_MAX);
}

static struct action_ops snd_pcm_action_reset = {
	.pre_action = snd_pcm_pre_reset,
	.do_action = snd_pcm_do_reset,
	.post_action = snd_pcm_post_reset
};

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static int snd_pcm_reset(struct snd_pcm_substream *substream)
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{
	return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
}

/*
 * prepare ioctl
 */
1438 1439 1440
/* we use the second argument for updating f_flags */
static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
			       int f_flags)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
1443 1444
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
	    runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
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		return -EBADFD;
	if (snd_pcm_running(substream))
		return -EBUSY;
1448
	substream->f_flags = f_flags;
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	return 0;
}

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static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
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{
	int err;
	err = substream->ops->prepare(substream);
	if (err < 0)
		return err;
	return snd_pcm_do_reset(substream, 0);
}

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static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	runtime->control->appl_ptr = runtime->status->hw_ptr;
1465
	snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
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}

static struct action_ops snd_pcm_action_prepare = {
	.pre_action = snd_pcm_pre_prepare,
	.do_action = snd_pcm_do_prepare,
	.post_action = snd_pcm_post_prepare
};

/**
1475
 * snd_pcm_prepare - prepare the PCM substream to be triggerable
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 * @substream: the PCM substream instance
1477
 * @file: file to refer f_flags
1478 1479
 *
 * Return: Zero if successful, or a negative error code.
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 */
1481 1482
static int snd_pcm_prepare(struct snd_pcm_substream *substream,
			   struct file *file)
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{
	int res;
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	struct snd_card *card = substream->pcm->card;
1486 1487 1488 1489 1490 1491
	int f_flags;

	if (file)
		f_flags = file->f_flags;
	else
		f_flags = substream->f_flags;
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	snd_power_lock(card);
1494
	if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1495 1496
		res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
					       substream, f_flags);
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	snd_power_unlock(card);
	return res;
}

/*
 * drain ioctl
 */

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static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
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{
1507 1508 1509 1510 1511 1512 1513 1514
	struct snd_pcm_runtime *runtime = substream->runtime;
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_OPEN:
	case SNDRV_PCM_STATE_DISCONNECTED:
	case SNDRV_PCM_STATE_SUSPENDED:
		return -EBADFD;
	}
	runtime->trigger_master = substream;
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	return 0;
}

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static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
L
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		switch (runtime->status->state) {
		case SNDRV_PCM_STATE_PREPARED:
			/* start playback stream if possible */
			if (! snd_pcm_playback_empty(substream)) {
				snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
				snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
			}
			break;
		case SNDRV_PCM_STATE_RUNNING:
			runtime->status->state = SNDRV_PCM_STATE_DRAINING;
			break;
1533 1534 1535
		case SNDRV_PCM_STATE_XRUN:
			runtime->status->state = SNDRV_PCM_STATE_SETUP;
			break;
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		default:
			break;
		}
	} else {
		/* stop running stream */
		if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1542
			int new_state = snd_pcm_capture_avail(runtime) > 0 ?
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				SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1544 1545
			snd_pcm_do_stop(substream, new_state);
			snd_pcm_post_stop(substream, new_state);
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		}
	}
	return 0;
}

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static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
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{
}

static struct action_ops snd_pcm_action_drain_init = {
	.pre_action = snd_pcm_pre_drain_init,
	.do_action = snd_pcm_do_drain_init,
	.post_action = snd_pcm_post_drain_init
};

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static int snd_pcm_drop(struct snd_pcm_substream *substream);
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/*
 * Drain the stream(s).
 * When the substream is linked, sync until the draining of all playback streams
 * is finished.
 * After this call, all streams are supposed to be either SETUP or DRAINING
 * (capture only) state.
 */
1570 1571
static int snd_pcm_drain(struct snd_pcm_substream *substream,
			 struct file *file)
L
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{
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	struct snd_card *card;
	struct snd_pcm_runtime *runtime;
1575
	struct snd_pcm_substream *s;
1576
	wait_queue_t wait;
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	int result = 0;
1578
	int nonblock = 0;
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	card = substream->pcm->card;
	runtime = substream->runtime;

	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;

	snd_power_lock(card);
	if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1588
		result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1589 1590 1591 1592
		if (result < 0) {
			snd_power_unlock(card);
			return result;
		}
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	}

1595 1596 1597 1598 1599 1600
	if (file) {
		if (file->f_flags & O_NONBLOCK)
			nonblock = 1;
	} else if (substream->f_flags & O_NONBLOCK)
		nonblock = 1;

1601 1602 1603
	down_read(&snd_pcm_link_rwsem);
	snd_pcm_stream_lock_irq(substream);
	/* resume pause */
1604
	if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1605 1606 1607 1608
		snd_pcm_pause(substream, 0);

	/* pre-start/stop - all running streams are changed to DRAINING state */
	result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1609 1610 1611 1612 1613 1614
	if (result < 0)
		goto unlock;
	/* in non-blocking, we don't wait in ioctl but let caller poll */
	if (nonblock) {
		result = -EAGAIN;
		goto unlock;
1615
	}
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	for (;;) {
		long tout;
1619
		struct snd_pcm_runtime *to_check;
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		if (signal_pending(current)) {
			result = -ERESTARTSYS;
			break;
		}
1624 1625 1626 1627 1628 1629 1630 1631
		/* find a substream to drain */
		to_check = NULL;
		snd_pcm_group_for_each_entry(s, substream) {
			if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
				continue;
			runtime = s->runtime;
			if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
				to_check = runtime;
1632
				break;
1633
			}
1634
		}
1635 1636 1637 1638
		if (!to_check)
			break; /* all drained */
		init_waitqueue_entry(&wait, current);
		add_wait_queue(&to_check->sleep, &wait);
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		snd_pcm_stream_unlock_irq(substream);
1640
		up_read(&snd_pcm_link_rwsem);
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		snd_power_unlock(card);
1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652
		if (runtime->no_period_wakeup)
			tout = MAX_SCHEDULE_TIMEOUT;
		else {
			tout = 10;
			if (runtime->rate) {
				long t = runtime->period_size * 2 / runtime->rate;
				tout = max(t, tout);
			}
			tout = msecs_to_jiffies(tout * 1000);
		}
		tout = schedule_timeout_interruptible(tout);
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		snd_power_lock(card);
1654
		down_read(&snd_pcm_link_rwsem);
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		snd_pcm_stream_lock_irq(substream);
1656
		remove_wait_queue(&to_check->sleep, &wait);
1657 1658 1659 1660
		if (card->shutdown) {
			result = -ENODEV;
			break;
		}
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		if (tout == 0) {
			if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
				result = -ESTRPIPE;
			else {
1665 1666
				dev_dbg(substream->pcm->card->dev,
					"playback drain error (DMA or IRQ trouble?)\n");
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				snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
				result = -EIO;
			}
			break;
		}
	}
1673

1674
 unlock:
1675
	snd_pcm_stream_unlock_irq(substream);
1676
	up_read(&snd_pcm_link_rwsem);
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	snd_power_unlock(card);

	return result;
}

/*
 * drop ioctl
 *
 * Immediately put all linked substreams into SETUP state.
 */
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static int snd_pcm_drop(struct snd_pcm_substream *substream)
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{
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	struct snd_pcm_runtime *runtime;
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1690 1691
	int result = 0;
	
1692 1693
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
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	runtime = substream->runtime;

1696
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1697 1698
	    runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
	    runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
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		return -EBADFD;

	snd_pcm_stream_lock_irq(substream);
	/* resume pause */
	if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
		snd_pcm_pause(substream, 0);

	snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
	/* runtime->control->appl_ptr = runtime->status->hw_ptr; */
	snd_pcm_stream_unlock_irq(substream);
1709

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	return result;
}


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static bool is_pcm_file(struct file *file)
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{
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	struct inode *inode = file_inode(file);
1717 1718
	unsigned int minor;

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	if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
		return false;
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	minor = iminor(inode);
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	return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
		snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
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}

/*
 * PCM link handling
 */
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static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
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{
	int res = 0;
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	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream1;
1734
	struct snd_pcm_group *group;
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	struct fd f = fdget(fd);
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	if (!f.file)
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		return -EBADFD;
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	if (!is_pcm_file(f.file)) {
		res = -EBADFD;
		goto _badf;
	}
	pcm_file = f.file->private_data;
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	substream1 = pcm_file->substream;
1745 1746 1747 1748 1749
	group = kmalloc(sizeof(*group), GFP_KERNEL);
	if (!group) {
		res = -ENOMEM;
		goto _nolock;
	}
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	down_write(&snd_pcm_link_rwsem);
	write_lock_irq(&snd_pcm_link_rwlock);
	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1753 1754
	    substream->runtime->status->state != substream1->runtime->status->state ||
	    substream->pcm->nonatomic != substream1->pcm->nonatomic) {
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		res = -EBADFD;
		goto _end;
	}
	if (snd_pcm_stream_linked(substream1)) {
		res = -EALREADY;
		goto _end;
	}
	if (!snd_pcm_stream_linked(substream)) {
1763
		substream->group = group;
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		group = NULL;
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		spin_lock_init(&substream->group->lock);
1766
		mutex_init(&substream->group->mutex);
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		INIT_LIST_HEAD(&substream->group->substreams);
		list_add_tail(&substream->link_list, &substream->group->substreams);
		substream->group->count = 1;
	}
	list_add_tail(&substream1->link_list, &substream->group->substreams);
	substream->group->count++;
	substream1->group = substream->group;
 _end:
	write_unlock_irq(&snd_pcm_link_rwlock);
	up_write(&snd_pcm_link_rwsem);
1777
 _nolock:
1778
	snd_card_unref(substream1->pcm->card);
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	kfree(group);
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 _badf:
	fdput(f);
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	return res;
}

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static void relink_to_local(struct snd_pcm_substream *substream)
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{
	substream->group = &substream->self_group;
	INIT_LIST_HEAD(&substream->self_group.substreams);
	list_add_tail(&substream->link_list, &substream->self_group.substreams);
}

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static int snd_pcm_unlink(struct snd_pcm_substream *substream)
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{
1794
	struct snd_pcm_substream *s;
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	int res = 0;

	down_write(&snd_pcm_link_rwsem);
	write_lock_irq(&snd_pcm_link_rwlock);
	if (!snd_pcm_stream_linked(substream)) {
		res = -EALREADY;
		goto _end;
	}
	list_del(&substream->link_list);
	substream->group->count--;
	if (substream->group->count == 1) {	/* detach the last stream, too */
1806 1807
		snd_pcm_group_for_each_entry(s, substream) {
			relink_to_local(s);
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			break;
		}
		kfree(substream->group);
	}
	relink_to_local(substream);
       _end:
	write_unlock_irq(&snd_pcm_link_rwlock);
	up_write(&snd_pcm_link_rwsem);
	return res;
}

/*
 * hw configurator
 */
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static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
			       struct snd_pcm_hw_rule *rule)
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{
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	struct snd_interval t;
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	snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
		     hw_param_interval_c(params, rule->deps[1]), &t);
	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}

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static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
			       struct snd_pcm_hw_rule *rule)
L
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1833
{
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1834
	struct snd_interval t;
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1835 1836 1837 1838 1839
	snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
		     hw_param_interval_c(params, rule->deps[1]), &t);
	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}

T
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static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
				   struct snd_pcm_hw_rule *rule)
L
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1842
{
T
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1843
	struct snd_interval t;
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	snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
			 hw_param_interval_c(params, rule->deps[1]),
			 (unsigned long) rule->private, &t);
	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}

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static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
				   struct snd_pcm_hw_rule *rule)
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1852
{
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1853
	struct snd_interval t;
L
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1854 1855 1856 1857 1858 1859
	snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
			 (unsigned long) rule->private,
			 hw_param_interval_c(params, rule->deps[1]), &t);
	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}

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1860 1861
static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
				  struct snd_pcm_hw_rule *rule)
L
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1862 1863
{
	unsigned int k;
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	struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
	struct snd_mask m;
	struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
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	snd_mask_any(&m);
	for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
		int bits;
		if (! snd_mask_test(mask, k))
			continue;
		bits = snd_pcm_format_physical_width(k);
		if (bits <= 0)
			continue; /* ignore invalid formats */
		if ((unsigned)bits < i->min || (unsigned)bits > i->max)
			snd_mask_reset(&m, k);
	}
	return snd_mask_refine(mask, &m);
}

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static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
				       struct snd_pcm_hw_rule *rule)
L
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1883
{
T
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1884
	struct snd_interval t;
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1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912
	unsigned int k;
	t.min = UINT_MAX;
	t.max = 0;
	t.openmin = 0;
	t.openmax = 0;
	for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
		int bits;
		if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
			continue;
		bits = snd_pcm_format_physical_width(k);
		if (bits <= 0)
			continue; /* ignore invalid formats */
		if (t.min > (unsigned)bits)
			t.min = bits;
		if (t.max < (unsigned)bits)
			t.max = bits;
	}
	t.integer = 1;
	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}

#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
#error "Change this table"
#endif

static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
                                 48000, 64000, 88200, 96000, 176400, 192000 };

1913 1914 1915 1916 1917
const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
	.count = ARRAY_SIZE(rates),
	.list = rates,
};

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static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
				struct snd_pcm_hw_rule *rule)
L
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1920
{
T
Takashi Iwai 已提交
1921
	struct snd_pcm_hardware *hw = rule->private;
L
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1922
	return snd_interval_list(hw_param_interval(params, rule->var),
1923 1924
				 snd_pcm_known_rates.count,
				 snd_pcm_known_rates.list, hw->rates);
L
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1925 1926
}		

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static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
					    struct snd_pcm_hw_rule *rule)
L
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1929
{
T
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1930 1931
	struct snd_interval t;
	struct snd_pcm_substream *substream = rule->private;
L
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1932 1933 1934 1935 1936 1937 1938 1939
	t.min = 0;
	t.max = substream->buffer_bytes_max;
	t.openmin = 0;
	t.openmax = 0;
	t.integer = 1;
	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}		

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1940
int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
L
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1941
{
T
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1942 1943
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
L
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1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063
	int k, err;

	for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
		snd_mask_any(constrs_mask(constrs, k));
	}

	for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
		snd_interval_any(constrs_interval(constrs, k));
	}

	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));

	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
				   snd_pcm_hw_rule_format, NULL,
				   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
				  snd_pcm_hw_rule_sample_bits, NULL,
				  SNDRV_PCM_HW_PARAM_FORMAT, 
				  SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
				  snd_pcm_hw_rule_div, NULL,
				  SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
				  snd_pcm_hw_rule_mul, NULL,
				  SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
				  snd_pcm_hw_rule_mulkdiv, (void*) 8,
				  SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
				  snd_pcm_hw_rule_mulkdiv, (void*) 8,
				  SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 
				  snd_pcm_hw_rule_div, NULL,
				  SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
				  snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
				  SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
				  snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 
				  snd_pcm_hw_rule_div, NULL,
				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
				  snd_pcm_hw_rule_div, NULL,
				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
				  snd_pcm_hw_rule_mulkdiv, (void*) 8,
				  SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
				  snd_pcm_hw_rule_muldivk, (void*) 1000000,
				  SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
				  snd_pcm_hw_rule_mul, NULL,
				  SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
				  snd_pcm_hw_rule_mulkdiv, (void*) 8,
				  SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
				  snd_pcm_hw_rule_muldivk, (void*) 1000000,
				  SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 
				  snd_pcm_hw_rule_muldivk, (void*) 8,
				  SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
				  snd_pcm_hw_rule_muldivk, (void*) 8,
				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 
				  snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
				  SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 
				  snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
	if (err < 0)
		return err;
	return 0;
}

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2064
int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
L
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2065
{
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2066 2067
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_pcm_hardware *hw = &runtime->hw;
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2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083
	int err;
	unsigned int mask = 0;

        if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
		mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
        if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
		mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
	if (hw->info & SNDRV_PCM_INFO_MMAP) {
		if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
			mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
		if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
			mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
		if (hw->info & SNDRV_PCM_INFO_COMPLEX)
			mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
	}
	err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2084 2085
	if (err < 0)
		return err;
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	err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2088 2089
	if (err < 0)
		return err;
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2090 2091

	err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2092 2093
	if (err < 0)
		return err;
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	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
					   hw->channels_min, hw->channels_max);
2097 2098
	if (err < 0)
		return err;
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2099 2100 2101

	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
					   hw->rate_min, hw->rate_max);
2102 2103
	if (err < 0)
		return err;
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2104 2105 2106

	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
					   hw->period_bytes_min, hw->period_bytes_max);
2107 2108
	if (err < 0)
		return err;
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2109 2110 2111

	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
					   hw->periods_min, hw->periods_max);
2112 2113
	if (err < 0)
		return err;
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2114 2115 2116

	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
					   hw->period_bytes_min, hw->buffer_bytes_max);
2117 2118
	if (err < 0)
		return err;
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	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
				  snd_pcm_hw_rule_buffer_bytes_max, substream,
				  SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
	if (err < 0)
		return err;

	/* FIXME: remove */
	if (runtime->dma_bytes) {
		err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2129
		if (err < 0)
2130
			return err;
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	}

	if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
		err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
					  snd_pcm_hw_rule_rate, hw,
					  SNDRV_PCM_HW_PARAM_RATE, -1);
		if (err < 0)
			return err;
	}

	/* FIXME: this belong to lowlevel */
	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);

	return 0;
}

2147
static void pcm_release_private(struct snd_pcm_substream *substream)
L
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2148 2149
{
	snd_pcm_unlink(substream);
2150 2151 2152 2153
}

void snd_pcm_release_substream(struct snd_pcm_substream *substream)
{
2154 2155 2156 2157
	substream->ref_count--;
	if (substream->ref_count > 0)
		return;

2158 2159
	snd_pcm_drop(substream);
	if (substream->hw_opened) {
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2160 2161 2162
		if (substream->ops->hw_free != NULL)
			substream->ops->hw_free(substream);
		substream->ops->close(substream);
2163
		substream->hw_opened = 0;
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	}
2165 2166
	if (pm_qos_request_active(&substream->latency_pm_qos_req))
		pm_qos_remove_request(&substream->latency_pm_qos_req);
2167 2168 2169 2170
	if (substream->pcm_release) {
		substream->pcm_release(substream);
		substream->pcm_release = NULL;
	}
2171 2172 2173
	snd_pcm_detach_substream(substream);
}

2174 2175
EXPORT_SYMBOL(snd_pcm_release_substream);

2176 2177 2178 2179 2180 2181 2182 2183 2184 2185
int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
			   struct file *file,
			   struct snd_pcm_substream **rsubstream)
{
	struct snd_pcm_substream *substream;
	int err;

	err = snd_pcm_attach_substream(pcm, stream, file, &substream);
	if (err < 0)
		return err;
2186 2187 2188 2189 2190
	if (substream->ref_count > 1) {
		*rsubstream = substream;
		return 0;
	}

2191 2192
	err = snd_pcm_hw_constraints_init(substream);
	if (err < 0) {
2193
		pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2194 2195 2196 2197 2198 2199 2200 2201 2202 2203
		goto error;
	}

	if ((err = substream->ops->open(substream)) < 0)
		goto error;

	substream->hw_opened = 1;

	err = snd_pcm_hw_constraints_complete(substream);
	if (err < 0) {
2204
		pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2205 2206 2207 2208
		goto error;
	}

	*rsubstream = substream;
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	return 0;
2210 2211 2212 2213

 error:
	snd_pcm_release_substream(substream);
	return err;
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2214 2215
}

2216 2217
EXPORT_SYMBOL(snd_pcm_open_substream);

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2218
static int snd_pcm_open_file(struct file *file,
T
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2219
			     struct snd_pcm *pcm,
2220
			     int stream)
L
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2221
{
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	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
2224
	int err;
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2226 2227 2228 2229
	err = snd_pcm_open_substream(pcm, stream, file, &substream);
	if (err < 0)
		return err;

2230 2231 2232 2233 2234 2235 2236
	pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
	if (pcm_file == NULL) {
		snd_pcm_release_substream(substream);
		return -ENOMEM;
	}
	pcm_file->substream = substream;
	if (substream->ref_count == 1) {
2237 2238
		substream->file = pcm_file;
		substream->pcm_release = pcm_release_private;
L
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2239 2240
	}
	file->private_data = pcm_file;
2241

L
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2242 2243 2244
	return 0;
}

2245 2246 2247
static int snd_pcm_playback_open(struct inode *inode, struct file *file)
{
	struct snd_pcm *pcm;
T
Takashi Iwai 已提交
2248 2249 2250
	int err = nonseekable_open(inode, file);
	if (err < 0)
		return err;
2251 2252
	pcm = snd_lookup_minor_data(iminor(inode),
				    SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2253
	err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
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Takashi Iwai 已提交
2254 2255
	if (pcm)
		snd_card_unref(pcm->card);
2256
	return err;
2257 2258 2259
}

static int snd_pcm_capture_open(struct inode *inode, struct file *file)
L
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2260
{
T
Takashi Iwai 已提交
2261
	struct snd_pcm *pcm;
T
Takashi Iwai 已提交
2262 2263 2264
	int err = nonseekable_open(inode, file);
	if (err < 0)
		return err;
2265 2266
	pcm = snd_lookup_minor_data(iminor(inode),
				    SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2267
	err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
T
Takashi Iwai 已提交
2268 2269
	if (pcm)
		snd_card_unref(pcm->card);
2270
	return err;
2271 2272 2273 2274 2275
}

static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
{
	int err;
L
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2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290
	wait_queue_t wait;

	if (pcm == NULL) {
		err = -ENODEV;
		goto __error1;
	}
	err = snd_card_file_add(pcm->card, file);
	if (err < 0)
		goto __error1;
	if (!try_module_get(pcm->card->module)) {
		err = -EFAULT;
		goto __error2;
	}
	init_waitqueue_entry(&wait, current);
	add_wait_queue(&pcm->open_wait, &wait);
2291
	mutex_lock(&pcm->open_mutex);
L
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2292
	while (1) {
2293
		err = snd_pcm_open_file(file, pcm, stream);
L
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2294 2295 2296 2297 2298 2299 2300 2301 2302 2303
		if (err >= 0)
			break;
		if (err == -EAGAIN) {
			if (file->f_flags & O_NONBLOCK) {
				err = -EBUSY;
				break;
			}
		} else
			break;
		set_current_state(TASK_INTERRUPTIBLE);
2304
		mutex_unlock(&pcm->open_mutex);
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2305
		schedule();
2306
		mutex_lock(&pcm->open_mutex);
2307 2308 2309 2310
		if (pcm->card->shutdown) {
			err = -ENODEV;
			break;
		}
L
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2311 2312 2313 2314 2315 2316
		if (signal_pending(current)) {
			err = -ERESTARTSYS;
			break;
		}
	}
	remove_wait_queue(&pcm->open_wait, &wait);
2317
	mutex_unlock(&pcm->open_mutex);
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2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331
	if (err < 0)
		goto __error;
	return err;

      __error:
	module_put(pcm->card->module);
      __error2:
      	snd_card_file_remove(pcm->card, file);
      __error1:
      	return err;
}

static int snd_pcm_release(struct inode *inode, struct file *file)
{
T
Takashi Iwai 已提交
2332 2333 2334
	struct snd_pcm *pcm;
	struct snd_pcm_substream *substream;
	struct snd_pcm_file *pcm_file;
L
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2335 2336 2337

	pcm_file = file->private_data;
	substream = pcm_file->substream;
2338 2339
	if (snd_BUG_ON(!substream))
		return -ENXIO;
L
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2340
	pcm = substream->pcm;
2341
	mutex_lock(&pcm->open_mutex);
2342
	snd_pcm_release_substream(substream);
2343
	kfree(pcm_file);
2344
	mutex_unlock(&pcm->open_mutex);
L
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2345 2346 2347 2348 2349 2350
	wake_up(&pcm->open_wait);
	module_put(pcm->card->module);
	snd_card_file_remove(pcm->card, file);
	return 0;
}

T
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static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
						 snd_pcm_uframes_t frames)
L
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2353
{
T
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2354
	struct snd_pcm_runtime *runtime = substream->runtime;
L
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2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373
	snd_pcm_sframes_t appl_ptr;
	snd_pcm_sframes_t ret;
	snd_pcm_sframes_t hw_avail;

	if (frames == 0)
		return 0;

	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_PREPARED:
		break;
	case SNDRV_PCM_STATE_DRAINING:
	case SNDRV_PCM_STATE_RUNNING:
		if (snd_pcm_update_hw_ptr(substream) >= 0)
			break;
		/* Fall through */
	case SNDRV_PCM_STATE_XRUN:
		ret = -EPIPE;
		goto __end;
2374 2375 2376
	case SNDRV_PCM_STATE_SUSPENDED:
		ret = -ESTRPIPE;
		goto __end;
L
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2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398
	default:
		ret = -EBADFD;
		goto __end;
	}

	hw_avail = snd_pcm_playback_hw_avail(runtime);
	if (hw_avail <= 0) {
		ret = 0;
		goto __end;
	}
	if (frames > (snd_pcm_uframes_t)hw_avail)
		frames = hw_avail;
	appl_ptr = runtime->control->appl_ptr - frames;
	if (appl_ptr < 0)
		appl_ptr += runtime->boundary;
	runtime->control->appl_ptr = appl_ptr;
	ret = frames;
 __end:
	snd_pcm_stream_unlock_irq(substream);
	return ret;
}

T
Takashi Iwai 已提交
2399 2400
static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
						snd_pcm_uframes_t frames)
L
Linus Torvalds 已提交
2401
{
T
Takashi Iwai 已提交
2402
	struct snd_pcm_runtime *runtime = substream->runtime;
L
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2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421
	snd_pcm_sframes_t appl_ptr;
	snd_pcm_sframes_t ret;
	snd_pcm_sframes_t hw_avail;

	if (frames == 0)
		return 0;

	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_DRAINING:
		break;
	case SNDRV_PCM_STATE_RUNNING:
		if (snd_pcm_update_hw_ptr(substream) >= 0)
			break;
		/* Fall through */
	case SNDRV_PCM_STATE_XRUN:
		ret = -EPIPE;
		goto __end;
2422 2423 2424
	case SNDRV_PCM_STATE_SUSPENDED:
		ret = -ESTRPIPE;
		goto __end;
L
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2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446
	default:
		ret = -EBADFD;
		goto __end;
	}

	hw_avail = snd_pcm_capture_hw_avail(runtime);
	if (hw_avail <= 0) {
		ret = 0;
		goto __end;
	}
	if (frames > (snd_pcm_uframes_t)hw_avail)
		frames = hw_avail;
	appl_ptr = runtime->control->appl_ptr - frames;
	if (appl_ptr < 0)
		appl_ptr += runtime->boundary;
	runtime->control->appl_ptr = appl_ptr;
	ret = frames;
 __end:
	snd_pcm_stream_unlock_irq(substream);
	return ret;
}

T
Takashi Iwai 已提交
2447 2448
static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
						  snd_pcm_uframes_t frames)
L
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2449
{
T
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	snd_pcm_sframes_t appl_ptr;
	snd_pcm_sframes_t ret;
	snd_pcm_sframes_t avail;

	if (frames == 0)
		return 0;

	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_PAUSED:
		break;
	case SNDRV_PCM_STATE_DRAINING:
	case SNDRV_PCM_STATE_RUNNING:
		if (snd_pcm_update_hw_ptr(substream) >= 0)
			break;
		/* Fall through */
	case SNDRV_PCM_STATE_XRUN:
		ret = -EPIPE;
		goto __end;
2471 2472 2473
	case SNDRV_PCM_STATE_SUSPENDED:
		ret = -ESTRPIPE;
		goto __end;
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	default:
		ret = -EBADFD;
		goto __end;
	}

	avail = snd_pcm_playback_avail(runtime);
	if (avail <= 0) {
		ret = 0;
		goto __end;
	}
	if (frames > (snd_pcm_uframes_t)avail)
		frames = avail;
	appl_ptr = runtime->control->appl_ptr + frames;
	if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
		appl_ptr -= runtime->boundary;
	runtime->control->appl_ptr = appl_ptr;
	ret = frames;
 __end:
	snd_pcm_stream_unlock_irq(substream);
	return ret;
}

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static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
						 snd_pcm_uframes_t frames)
L
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	snd_pcm_sframes_t appl_ptr;
	snd_pcm_sframes_t ret;
	snd_pcm_sframes_t avail;

	if (frames == 0)
		return 0;

	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_DRAINING:
	case SNDRV_PCM_STATE_PAUSED:
		break;
	case SNDRV_PCM_STATE_RUNNING:
		if (snd_pcm_update_hw_ptr(substream) >= 0)
			break;
		/* Fall through */
	case SNDRV_PCM_STATE_XRUN:
		ret = -EPIPE;
		goto __end;
2520 2521 2522
	case SNDRV_PCM_STATE_SUSPENDED:
		ret = -ESTRPIPE;
		goto __end;
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	default:
		ret = -EBADFD;
		goto __end;
	}

	avail = snd_pcm_capture_avail(runtime);
	if (avail <= 0) {
		ret = 0;
		goto __end;
	}
	if (frames > (snd_pcm_uframes_t)avail)
		frames = avail;
	appl_ptr = runtime->control->appl_ptr + frames;
	if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
		appl_ptr -= runtime->boundary;
	runtime->control->appl_ptr = appl_ptr;
	ret = frames;
 __end:
	snd_pcm_stream_unlock_irq(substream);
	return ret;
}

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static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
L
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
L
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	int err;

	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_DRAINING:
		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
			goto __badfd;
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		/* Fall through */
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	case SNDRV_PCM_STATE_RUNNING:
		if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
			break;
		/* Fall through */
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_SUSPENDED:
		err = 0;
		break;
	case SNDRV_PCM_STATE_XRUN:
		err = -EPIPE;
		break;
	default:
	      __badfd:
		err = -EBADFD;
		break;
	}
	snd_pcm_stream_unlock_irq(substream);
	return err;
}
		
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static int snd_pcm_delay(struct snd_pcm_substream *substream,
			 snd_pcm_sframes_t __user *res)
L
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	int err;
	snd_pcm_sframes_t n = 0;

	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_DRAINING:
		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
			goto __badfd;
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		/* Fall through */
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	case SNDRV_PCM_STATE_RUNNING:
		if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
			break;
		/* Fall through */
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_SUSPENDED:
		err = 0;
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			n = snd_pcm_playback_hw_avail(runtime);
		else
			n = snd_pcm_capture_avail(runtime);
2600
		n += runtime->delay;
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		break;
	case SNDRV_PCM_STATE_XRUN:
		err = -EPIPE;
		break;
	default:
	      __badfd:
		err = -EBADFD;
		break;
	}
	snd_pcm_stream_unlock_irq(substream);
	if (!err)
		if (put_user(n, res))
			err = -EFAULT;
	return err;
}
		
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static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
			    struct snd_pcm_sync_ptr __user *_sync_ptr)
L
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{
T
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	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_pcm_sync_ptr sync_ptr;
	volatile struct snd_pcm_mmap_status *status;
	volatile struct snd_pcm_mmap_control *control;
L
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	int err;

	memset(&sync_ptr, 0, sizeof(sync_ptr));
	if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
		return -EFAULT;
T
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	if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
L
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		return -EFAULT;	
	status = runtime->status;
	control = runtime->control;
	if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
		err = snd_pcm_hwsync(substream);
		if (err < 0)
			return err;
	}
	snd_pcm_stream_lock_irq(substream);
	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
		control->appl_ptr = sync_ptr.c.control.appl_ptr;
	else
		sync_ptr.c.control.appl_ptr = control->appl_ptr;
	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
		control->avail_min = sync_ptr.c.control.avail_min;
	else
		sync_ptr.c.control.avail_min = control->avail_min;
	sync_ptr.s.status.state = status->state;
	sync_ptr.s.status.hw_ptr = status->hw_ptr;
	sync_ptr.s.status.tstamp = status->tstamp;
	sync_ptr.s.status.suspended_state = status->suspended_state;
	snd_pcm_stream_unlock_irq(substream);
	if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
		return -EFAULT;
	return 0;
}
2656 2657 2658 2659 2660 2661 2662 2663 2664 2665

static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	int arg;
	
	if (get_user(arg, _arg))
		return -EFAULT;
	if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
		return -EINVAL;
2666
	runtime->tstamp_type = arg;
2667 2668
	return 0;
}
L
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static int snd_pcm_common_ioctl1(struct file *file,
				 struct snd_pcm_substream *substream,
L
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				 unsigned int cmd, void __user *arg)
{
	switch (cmd) {
	case SNDRV_PCM_IOCTL_PVERSION:
		return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
	case SNDRV_PCM_IOCTL_INFO:
		return snd_pcm_info_user(substream, arg);
2679 2680
	case SNDRV_PCM_IOCTL_TSTAMP:	/* just for compatibility */
		return 0;
2681 2682
	case SNDRV_PCM_IOCTL_TTSTAMP:
		return snd_pcm_tstamp(substream, arg);
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	case SNDRV_PCM_IOCTL_HW_REFINE:
		return snd_pcm_hw_refine_user(substream, arg);
	case SNDRV_PCM_IOCTL_HW_PARAMS:
		return snd_pcm_hw_params_user(substream, arg);
	case SNDRV_PCM_IOCTL_HW_FREE:
		return snd_pcm_hw_free(substream);
	case SNDRV_PCM_IOCTL_SW_PARAMS:
		return snd_pcm_sw_params_user(substream, arg);
	case SNDRV_PCM_IOCTL_STATUS:
		return snd_pcm_status_user(substream, arg);
	case SNDRV_PCM_IOCTL_CHANNEL_INFO:
		return snd_pcm_channel_info_user(substream, arg);
	case SNDRV_PCM_IOCTL_PREPARE:
2696
		return snd_pcm_prepare(substream, file);
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	case SNDRV_PCM_IOCTL_RESET:
		return snd_pcm_reset(substream);
	case SNDRV_PCM_IOCTL_START:
		return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
	case SNDRV_PCM_IOCTL_LINK:
		return snd_pcm_link(substream, (int)(unsigned long) arg);
	case SNDRV_PCM_IOCTL_UNLINK:
		return snd_pcm_unlink(substream);
	case SNDRV_PCM_IOCTL_RESUME:
		return snd_pcm_resume(substream);
	case SNDRV_PCM_IOCTL_XRUN:
		return snd_pcm_xrun(substream);
	case SNDRV_PCM_IOCTL_HWSYNC:
		return snd_pcm_hwsync(substream);
	case SNDRV_PCM_IOCTL_DELAY:
		return snd_pcm_delay(substream, arg);
	case SNDRV_PCM_IOCTL_SYNC_PTR:
		return snd_pcm_sync_ptr(substream, arg);
2715
#ifdef CONFIG_SND_SUPPORT_OLD_API
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	case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
		return snd_pcm_hw_refine_old_user(substream, arg);
	case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
		return snd_pcm_hw_params_old_user(substream, arg);
2720
#endif
L
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	case SNDRV_PCM_IOCTL_DRAIN:
2722
		return snd_pcm_drain(substream, file);
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	case SNDRV_PCM_IOCTL_DROP:
		return snd_pcm_drop(substream);
2725 2726 2727 2728 2729 2730 2731 2732
	case SNDRV_PCM_IOCTL_PAUSE:
	{
		int res;
		snd_pcm_stream_lock_irq(substream);
		res = snd_pcm_pause(substream, (int)(unsigned long)arg);
		snd_pcm_stream_unlock_irq(substream);
		return res;
	}
L
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	}
2734
	pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
L
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	return -ENOTTY;
}

2738 2739
static int snd_pcm_playback_ioctl1(struct file *file,
				   struct snd_pcm_substream *substream,
L
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				   unsigned int cmd, void __user *arg)
{
2742 2743 2744 2745
	if (snd_BUG_ON(!substream))
		return -ENXIO;
	if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
		return -EINVAL;
L
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	switch (cmd) {
	case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
	{
T
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		struct snd_xferi xferi;
		struct snd_xferi __user *_xferi = arg;
		struct snd_pcm_runtime *runtime = substream->runtime;
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		snd_pcm_sframes_t result;
		if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
			return -EBADFD;
		if (put_user(0, &_xferi->result))
			return -EFAULT;
		if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
			return -EFAULT;
		result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
		__put_user(result, &_xferi->result);
		return result < 0 ? result : 0;
	}
	case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
	{
T
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		struct snd_xfern xfern;
		struct snd_xfern __user *_xfern = arg;
		struct snd_pcm_runtime *runtime = substream->runtime;
L
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		void __user **bufs;
		snd_pcm_sframes_t result;
		if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
			return -EBADFD;
		if (runtime->channels > 128)
			return -EINVAL;
		if (put_user(0, &_xfern->result))
			return -EFAULT;
		if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
			return -EFAULT;
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		bufs = memdup_user(xfern.bufs,
				   sizeof(void *) * runtime->channels);
		if (IS_ERR(bufs))
			return PTR_ERR(bufs);
L
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		result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
		kfree(bufs);
		__put_user(result, &_xfern->result);
		return result < 0 ? result : 0;
	}
	case SNDRV_PCM_IOCTL_REWIND:
	{
		snd_pcm_uframes_t frames;
		snd_pcm_uframes_t __user *_frames = arg;
		snd_pcm_sframes_t result;
		if (get_user(frames, _frames))
			return -EFAULT;
		if (put_user(0, _frames))
			return -EFAULT;
		result = snd_pcm_playback_rewind(substream, frames);
		__put_user(result, _frames);
		return result < 0 ? result : 0;
	}
	case SNDRV_PCM_IOCTL_FORWARD:
	{
		snd_pcm_uframes_t frames;
		snd_pcm_uframes_t __user *_frames = arg;
		snd_pcm_sframes_t result;
		if (get_user(frames, _frames))
			return -EFAULT;
		if (put_user(0, _frames))
			return -EFAULT;
		result = snd_pcm_playback_forward(substream, frames);
		__put_user(result, _frames);
		return result < 0 ? result : 0;
	}
	}
2815
	return snd_pcm_common_ioctl1(file, substream, cmd, arg);
L
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}

2818 2819
static int snd_pcm_capture_ioctl1(struct file *file,
				  struct snd_pcm_substream *substream,
L
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				  unsigned int cmd, void __user *arg)
{
2822 2823 2824 2825
	if (snd_BUG_ON(!substream))
		return -ENXIO;
	if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
		return -EINVAL;
L
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	switch (cmd) {
	case SNDRV_PCM_IOCTL_READI_FRAMES:
	{
T
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		struct snd_xferi xferi;
		struct snd_xferi __user *_xferi = arg;
		struct snd_pcm_runtime *runtime = substream->runtime;
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		snd_pcm_sframes_t result;
		if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
			return -EBADFD;
		if (put_user(0, &_xferi->result))
			return -EFAULT;
		if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
			return -EFAULT;
		result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
		__put_user(result, &_xferi->result);
		return result < 0 ? result : 0;
	}
	case SNDRV_PCM_IOCTL_READN_FRAMES:
	{
T
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		struct snd_xfern xfern;
		struct snd_xfern __user *_xfern = arg;
		struct snd_pcm_runtime *runtime = substream->runtime;
L
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		void *bufs;
		snd_pcm_sframes_t result;
		if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
			return -EBADFD;
		if (runtime->channels > 128)
			return -EINVAL;
		if (put_user(0, &_xfern->result))
			return -EFAULT;
		if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
			return -EFAULT;
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		bufs = memdup_user(xfern.bufs,
				   sizeof(void *) * runtime->channels);
		if (IS_ERR(bufs))
			return PTR_ERR(bufs);
L
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		result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
		kfree(bufs);
		__put_user(result, &_xfern->result);
		return result < 0 ? result : 0;
	}
	case SNDRV_PCM_IOCTL_REWIND:
	{
		snd_pcm_uframes_t frames;
		snd_pcm_uframes_t __user *_frames = arg;
		snd_pcm_sframes_t result;
		if (get_user(frames, _frames))
			return -EFAULT;
		if (put_user(0, _frames))
			return -EFAULT;
		result = snd_pcm_capture_rewind(substream, frames);
		__put_user(result, _frames);
		return result < 0 ? result : 0;
	}
	case SNDRV_PCM_IOCTL_FORWARD:
	{
		snd_pcm_uframes_t frames;
		snd_pcm_uframes_t __user *_frames = arg;
		snd_pcm_sframes_t result;
		if (get_user(frames, _frames))
			return -EFAULT;
		if (put_user(0, _frames))
			return -EFAULT;
		result = snd_pcm_capture_forward(substream, frames);
		__put_user(result, _frames);
		return result < 0 ? result : 0;
	}
	}
2895
	return snd_pcm_common_ioctl1(file, substream, cmd, arg);
L
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}

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static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
				   unsigned long arg)
L
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{
T
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	struct snd_pcm_file *pcm_file;
L
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	pcm_file = file->private_data;

	if (((cmd >> 8) & 0xff) != 'A')
		return -ENOTTY;

2908 2909
	return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
				       (void __user *)arg);
L
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}

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static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
				  unsigned long arg)
L
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{
T
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2915
	struct snd_pcm_file *pcm_file;
L
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	pcm_file = file->private_data;

	if (((cmd >> 8) & 0xff) != 'A')
		return -ENOTTY;

2922 2923
	return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
				      (void __user *)arg);
L
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}

T
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int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
			 unsigned int cmd, void *arg)
L
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{
	mm_segment_t fs;
	int result;
	
	fs = snd_enter_user();
	switch (substream->stream) {
	case SNDRV_PCM_STREAM_PLAYBACK:
2935 2936
		result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
						 (void __user *)arg);
T
Takashi Iwai 已提交
2937
		break;
L
Linus Torvalds 已提交
2938
	case SNDRV_PCM_STREAM_CAPTURE:
2939 2940
		result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
						(void __user *)arg);
T
Takashi Iwai 已提交
2941
		break;
L
Linus Torvalds 已提交
2942
	default:
T
Takashi Iwai 已提交
2943 2944
		result = -EINVAL;
		break;
L
Linus Torvalds 已提交
2945
	}
T
Takashi Iwai 已提交
2946 2947
	snd_leave_user(fs);
	return result;
L
Linus Torvalds 已提交
2948 2949
}

2950 2951
EXPORT_SYMBOL(snd_pcm_kernel_ioctl);

T
Takashi Iwai 已提交
2952 2953
static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
			    loff_t * offset)
L
Linus Torvalds 已提交
2954
{
T
Takashi Iwai 已提交
2955 2956 2957
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
2958 2959 2960 2961
	snd_pcm_sframes_t result;

	pcm_file = file->private_data;
	substream = pcm_file->substream;
2962 2963
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975
	runtime = substream->runtime;
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
	if (!frame_aligned(runtime, count))
		return -EINVAL;
	count = bytes_to_frames(runtime, count);
	result = snd_pcm_lib_read(substream, buf, count);
	if (result > 0)
		result = frames_to_bytes(runtime, result);
	return result;
}

T
Takashi Iwai 已提交
2976 2977
static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
			     size_t count, loff_t * offset)
L
Linus Torvalds 已提交
2978
{
T
Takashi Iwai 已提交
2979 2980 2981
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
2982 2983 2984 2985
	snd_pcm_sframes_t result;

	pcm_file = file->private_data;
	substream = pcm_file->substream;
2986 2987
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
2988
	runtime = substream->runtime;
2989 2990 2991 2992
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
	if (!frame_aligned(runtime, count))
		return -EINVAL;
L
Linus Torvalds 已提交
2993 2994 2995 2996 2997 2998 2999
	count = bytes_to_frames(runtime, count);
	result = snd_pcm_lib_write(substream, buf, count);
	if (result > 0)
		result = frames_to_bytes(runtime, result);
	return result;
}

3000 3001
static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
			     unsigned long nr_segs, loff_t pos)
L
Linus Torvalds 已提交
3002 3003

{
T
Takashi Iwai 已提交
3004 3005 3006
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3007 3008 3009 3010 3011
	snd_pcm_sframes_t result;
	unsigned long i;
	void __user **bufs;
	snd_pcm_uframes_t frames;

3012
	pcm_file = iocb->ki_filp->private_data;
L
Linus Torvalds 已提交
3013
	substream = pcm_file->substream;
3014 3015
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
3016 3017 3018
	runtime = substream->runtime;
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
3019
	if (nr_segs > 1024 || nr_segs != runtime->channels)
L
Linus Torvalds 已提交
3020
		return -EINVAL;
3021
	if (!frame_aligned(runtime, iov->iov_len))
L
Linus Torvalds 已提交
3022
		return -EINVAL;
3023 3024
	frames = bytes_to_samples(runtime, iov->iov_len);
	bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
L
Linus Torvalds 已提交
3025 3026
	if (bufs == NULL)
		return -ENOMEM;
3027 3028
	for (i = 0; i < nr_segs; ++i)
		bufs[i] = iov[i].iov_base;
L
Linus Torvalds 已提交
3029 3030 3031 3032 3033 3034 3035
	result = snd_pcm_lib_readv(substream, bufs, frames);
	if (result > 0)
		result = frames_to_bytes(runtime, result);
	kfree(bufs);
	return result;
}

3036 3037
static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
			      unsigned long nr_segs, loff_t pos)
L
Linus Torvalds 已提交
3038
{
T
Takashi Iwai 已提交
3039 3040 3041
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3042 3043 3044 3045 3046
	snd_pcm_sframes_t result;
	unsigned long i;
	void __user **bufs;
	snd_pcm_uframes_t frames;

3047
	pcm_file = iocb->ki_filp->private_data;
L
Linus Torvalds 已提交
3048
	substream = pcm_file->substream;
3049 3050
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
3051
	runtime = substream->runtime;
3052 3053
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
3054
	if (nr_segs > 128 || nr_segs != runtime->channels ||
3055 3056
	    !frame_aligned(runtime, iov->iov_len))
		return -EINVAL;
3057 3058
	frames = bytes_to_samples(runtime, iov->iov_len);
	bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
L
Linus Torvalds 已提交
3059 3060
	if (bufs == NULL)
		return -ENOMEM;
3061 3062
	for (i = 0; i < nr_segs; ++i)
		bufs[i] = iov[i].iov_base;
L
Linus Torvalds 已提交
3063 3064 3065 3066 3067 3068 3069 3070 3071
	result = snd_pcm_lib_writev(substream, bufs, frames);
	if (result > 0)
		result = frames_to_bytes(runtime, result);
	kfree(bufs);
	return result;
}

static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
{
T
Takashi Iwai 已提交
3072 3073 3074
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3075 3076 3077 3078 3079 3080
        unsigned int mask;
	snd_pcm_uframes_t avail;

	pcm_file = file->private_data;

	substream = pcm_file->substream;
3081 3082
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110
	runtime = substream->runtime;

	poll_wait(file, &runtime->sleep, wait);

	snd_pcm_stream_lock_irq(substream);
	avail = snd_pcm_playback_avail(runtime);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_RUNNING:
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_PAUSED:
		if (avail >= runtime->control->avail_min) {
			mask = POLLOUT | POLLWRNORM;
			break;
		}
		/* Fall through */
	case SNDRV_PCM_STATE_DRAINING:
		mask = 0;
		break;
	default:
		mask = POLLOUT | POLLWRNORM | POLLERR;
		break;
	}
	snd_pcm_stream_unlock_irq(substream);
	return mask;
}

static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
{
T
Takashi Iwai 已提交
3111 3112 3113
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3114 3115 3116 3117 3118 3119
        unsigned int mask;
	snd_pcm_uframes_t avail;

	pcm_file = file->private_data;

	substream = pcm_file->substream;
3120 3121
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163
	runtime = substream->runtime;

	poll_wait(file, &runtime->sleep, wait);

	snd_pcm_stream_lock_irq(substream);
	avail = snd_pcm_capture_avail(runtime);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_RUNNING:
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_PAUSED:
		if (avail >= runtime->control->avail_min) {
			mask = POLLIN | POLLRDNORM;
			break;
		}
		mask = 0;
		break;
	case SNDRV_PCM_STATE_DRAINING:
		if (avail > 0) {
			mask = POLLIN | POLLRDNORM;
			break;
		}
		/* Fall through */
	default:
		mask = POLLIN | POLLRDNORM | POLLERR;
		break;
	}
	snd_pcm_stream_unlock_irq(substream);
	return mask;
}

/*
 * mmap support
 */

/*
 * Only on coherent architectures, we can mmap the status and the control records
 * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
 */
#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
/*
 * mmap status record
 */
N
Nick Piggin 已提交
3164 3165
static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
						struct vm_fault *vmf)
L
Linus Torvalds 已提交
3166
{
T
Takashi Iwai 已提交
3167 3168
	struct snd_pcm_substream *substream = area->vm_private_data;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3169 3170
	
	if (substream == NULL)
N
Nick Piggin 已提交
3171
		return VM_FAULT_SIGBUS;
L
Linus Torvalds 已提交
3172
	runtime = substream->runtime;
N
Nick Piggin 已提交
3173 3174 3175
	vmf->page = virt_to_page(runtime->status);
	get_page(vmf->page);
	return 0;
L
Linus Torvalds 已提交
3176 3177
}

3178
static const struct vm_operations_struct snd_pcm_vm_ops_status =
L
Linus Torvalds 已提交
3179
{
N
Nick Piggin 已提交
3180
	.fault =	snd_pcm_mmap_status_fault,
L
Linus Torvalds 已提交
3181 3182
};

T
Takashi Iwai 已提交
3183
static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
L
Linus Torvalds 已提交
3184 3185 3186 3187 3188 3189
			       struct vm_area_struct *area)
{
	long size;
	if (!(area->vm_flags & VM_READ))
		return -EINVAL;
	size = area->vm_end - area->vm_start;
T
Takashi Iwai 已提交
3190
	if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
L
Linus Torvalds 已提交
3191 3192 3193
		return -EINVAL;
	area->vm_ops = &snd_pcm_vm_ops_status;
	area->vm_private_data = substream;
3194
	area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
L
Linus Torvalds 已提交
3195 3196 3197 3198 3199 3200
	return 0;
}

/*
 * mmap control record
 */
N
Nick Piggin 已提交
3201 3202
static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
						struct vm_fault *vmf)
L
Linus Torvalds 已提交
3203
{
T
Takashi Iwai 已提交
3204 3205
	struct snd_pcm_substream *substream = area->vm_private_data;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3206 3207
	
	if (substream == NULL)
N
Nick Piggin 已提交
3208
		return VM_FAULT_SIGBUS;
L
Linus Torvalds 已提交
3209
	runtime = substream->runtime;
N
Nick Piggin 已提交
3210 3211 3212
	vmf->page = virt_to_page(runtime->control);
	get_page(vmf->page);
	return 0;
L
Linus Torvalds 已提交
3213 3214
}

3215
static const struct vm_operations_struct snd_pcm_vm_ops_control =
L
Linus Torvalds 已提交
3216
{
N
Nick Piggin 已提交
3217
	.fault =	snd_pcm_mmap_control_fault,
L
Linus Torvalds 已提交
3218 3219
};

T
Takashi Iwai 已提交
3220
static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
L
Linus Torvalds 已提交
3221 3222 3223 3224 3225 3226
				struct vm_area_struct *area)
{
	long size;
	if (!(area->vm_flags & VM_READ))
		return -EINVAL;
	size = area->vm_end - area->vm_start;
T
Takashi Iwai 已提交
3227
	if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
L
Linus Torvalds 已提交
3228 3229 3230
		return -EINVAL;
	area->vm_ops = &snd_pcm_vm_ops_control;
	area->vm_private_data = substream;
3231
	area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
L
Linus Torvalds 已提交
3232 3233 3234 3235 3236 3237
	return 0;
}
#else /* ! coherent mmap */
/*
 * don't support mmap for status and control records.
 */
T
Takashi Iwai 已提交
3238
static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
L
Linus Torvalds 已提交
3239 3240 3241 3242
			       struct vm_area_struct *area)
{
	return -ENXIO;
}
T
Takashi Iwai 已提交
3243
static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
L
Linus Torvalds 已提交
3244 3245 3246 3247 3248 3249
				struct vm_area_struct *area)
{
	return -ENXIO;
}
#endif /* coherent mmap */

3250 3251 3252 3253
static inline struct page *
snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
{
	void *vaddr = substream->runtime->dma_area + ofs;
3254 3255 3256
#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
	if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
		return virt_to_page(CAC_ADDR(vaddr));
3257 3258 3259 3260 3261 3262 3263 3264 3265 3266
#endif
#if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
	if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
		dma_addr_t addr = substream->runtime->dma_addr + ofs;
		addr -= get_dma_offset(substream->dma_buffer.dev.dev);
		/* assume dma_handle set via pfn_to_phys() in
		 * mm/dma-noncoherent.c
		 */
		return pfn_to_page(addr >> PAGE_SHIFT);
	}
3267
#endif
3268 3269 3270
	return virt_to_page(vaddr);
}

L
Linus Torvalds 已提交
3271
/*
N
Nick Piggin 已提交
3272
 * fault callback for mmapping a RAM page
L
Linus Torvalds 已提交
3273
 */
N
Nick Piggin 已提交
3274 3275
static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
						struct vm_fault *vmf)
L
Linus Torvalds 已提交
3276
{
T
Takashi Iwai 已提交
3277 3278
	struct snd_pcm_substream *substream = area->vm_private_data;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3279 3280 3281 3282 3283
	unsigned long offset;
	struct page * page;
	size_t dma_bytes;
	
	if (substream == NULL)
N
Nick Piggin 已提交
3284
		return VM_FAULT_SIGBUS;
L
Linus Torvalds 已提交
3285
	runtime = substream->runtime;
N
Nick Piggin 已提交
3286
	offset = vmf->pgoff << PAGE_SHIFT;
L
Linus Torvalds 已提交
3287 3288
	dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
	if (offset > dma_bytes - PAGE_SIZE)
N
Nick Piggin 已提交
3289
		return VM_FAULT_SIGBUS;
3290
	if (substream->ops->page)
L
Linus Torvalds 已提交
3291
		page = substream->ops->page(substream, offset);
3292 3293 3294 3295
	else
		page = snd_pcm_default_page_ops(substream, offset);
	if (!page)
		return VM_FAULT_SIGBUS;
N
Nick Piggin 已提交
3296
	get_page(page);
N
Nick Piggin 已提交
3297 3298
	vmf->page = page;
	return 0;
L
Linus Torvalds 已提交
3299 3300
}

3301 3302 3303 3304 3305 3306
static const struct vm_operations_struct snd_pcm_vm_ops_data = {
	.open =		snd_pcm_mmap_data_open,
	.close =	snd_pcm_mmap_data_close,
};

static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
L
Linus Torvalds 已提交
3307 3308
	.open =		snd_pcm_mmap_data_open,
	.close =	snd_pcm_mmap_data_close,
N
Nick Piggin 已提交
3309
	.fault =	snd_pcm_mmap_data_fault,
L
Linus Torvalds 已提交
3310 3311
};

3312 3313 3314 3315 3316 3317 3318
#ifndef ARCH_HAS_DMA_MMAP_COHERENT
/* This should be defined / handled globally! */
#ifdef CONFIG_ARM
#define ARCH_HAS_DMA_MMAP_COHERENT
#endif
#endif

L
Linus Torvalds 已提交
3319 3320 3321
/*
 * mmap the DMA buffer on RAM
 */
3322 3323
int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
			     struct vm_area_struct *area)
L
Linus Torvalds 已提交
3324
{
3325
	area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3326
#ifdef CONFIG_GENERIC_ALLOCATOR
3327 3328 3329 3330 3331 3332
	if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
		area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
		return remap_pfn_range(area, area->vm_start,
				substream->dma_buffer.addr >> PAGE_SHIFT,
				area->vm_end - area->vm_start, area->vm_page_prot);
	}
3333
#endif /* CONFIG_GENERIC_ALLOCATOR */
3334 3335 3336 3337 3338 3339 3340 3341
#ifdef ARCH_HAS_DMA_MMAP_COHERENT
	if (!substream->ops->page &&
	    substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
		return dma_mmap_coherent(substream->dma_buffer.dev.dev,
					 area,
					 substream->runtime->dma_area,
					 substream->runtime->dma_addr,
					 area->vm_end - area->vm_start);
3342 3343 3344 3345
#elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
	if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
	    !plat_device_is_coherent(substream->dma_buffer.dev.dev))
		area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3346 3347 3348
#endif /* ARCH_HAS_DMA_MMAP_COHERENT */
	/* mmap with fault handler */
	area->vm_ops = &snd_pcm_vm_ops_data_fault;
L
Linus Torvalds 已提交
3349 3350
	return 0;
}
3351
EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
L
Linus Torvalds 已提交
3352 3353 3354 3355 3356

/*
 * mmap the DMA buffer on I/O memory area
 */
#if SNDRV_PCM_INFO_MMAP_IOMEM
T
Takashi Iwai 已提交
3357 3358
int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
			   struct vm_area_struct *area)
L
Linus Torvalds 已提交
3359
{
3360
	struct snd_pcm_runtime *runtime = substream->runtime;;
L
Linus Torvalds 已提交
3361 3362

	area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3363
	return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
L
Linus Torvalds 已提交
3364
}
3365 3366

EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
L
Linus Torvalds 已提交
3367 3368 3369 3370 3371
#endif /* SNDRV_PCM_INFO_MMAP */

/*
 * mmap DMA buffer
 */
T
Takashi Iwai 已提交
3372
int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
L
Linus Torvalds 已提交
3373 3374
		      struct vm_area_struct *area)
{
T
Takashi Iwai 已提交
3375
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3376 3377 3378
	long size;
	unsigned long offset;
	size_t dma_bytes;
3379
	int err;
L
Linus Torvalds 已提交
3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		if (!(area->vm_flags & (VM_WRITE|VM_READ)))
			return -EINVAL;
	} else {
		if (!(area->vm_flags & VM_READ))
			return -EINVAL;
	}
	runtime = substream->runtime;
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
	if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
		return -ENXIO;
	if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
	    runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
		return -EINVAL;
	size = area->vm_end - area->vm_start;
	offset = area->vm_pgoff << PAGE_SHIFT;
	dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
	if ((size_t)size > dma_bytes)
		return -EINVAL;
	if (offset > dma_bytes - size)
		return -EINVAL;

3404 3405
	area->vm_ops = &snd_pcm_vm_ops_data;
	area->vm_private_data = substream;
L
Linus Torvalds 已提交
3406
	if (substream->ops->mmap)
3407
		err = substream->ops->mmap(substream, area);
L
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	else
3409
		err = snd_pcm_lib_default_mmap(substream, area);
3410 3411 3412
	if (!err)
		atomic_inc(&substream->mmap_count);
	return err;
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}

3415 3416
EXPORT_SYMBOL(snd_pcm_mmap_data);

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static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
{
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	struct snd_pcm_file * pcm_file;
	struct snd_pcm_substream *substream;	
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	unsigned long offset;
	
	pcm_file = file->private_data;
	substream = pcm_file->substream;
3425 3426
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
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	offset = area->vm_pgoff << PAGE_SHIFT;
	switch (offset) {
	case SNDRV_PCM_MMAP_OFFSET_STATUS:
3431
		if (pcm_file->no_compat_mmap)
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			return -ENXIO;
		return snd_pcm_mmap_status(substream, file, area);
	case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3435
		if (pcm_file->no_compat_mmap)
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			return -ENXIO;
		return snd_pcm_mmap_control(substream, file, area);
	default:
		return snd_pcm_mmap_data(substream, file, area);
	}
	return 0;
}

static int snd_pcm_fasync(int fd, struct file * file, int on)
{
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	struct snd_pcm_file * pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
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	pcm_file = file->private_data;
	substream = pcm_file->substream;
3452
	if (PCM_RUNTIME_CHECK(substream))
3453
		return -ENXIO;
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	runtime = substream->runtime;
3455
	return fasync_helper(fd, file, on, &runtime->fasync);
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}

/*
 * ioctl32 compat
 */
#ifdef CONFIG_COMPAT
#include "pcm_compat.c"
#else
#define snd_pcm_ioctl_compat	NULL
#endif

/*
 *  To be removed helpers to keep binary compatibility
 */

3471
#ifdef CONFIG_SND_SUPPORT_OLD_API
L
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#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))

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static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
					       struct snd_pcm_hw_params_old *oparams)
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{
	unsigned int i;

	memset(params, 0, sizeof(*params));
	params->flags = oparams->flags;
	for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
		params->masks[i].bits[0] = oparams->masks[i];
	memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
	params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
	params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
	params->info = oparams->info;
	params->msbits = oparams->msbits;
	params->rate_num = oparams->rate_num;
	params->rate_den = oparams->rate_den;
	params->fifo_size = oparams->fifo_size;
}

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static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
					     struct snd_pcm_hw_params *params)
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{
	unsigned int i;

	memset(oparams, 0, sizeof(*oparams));
	oparams->flags = params->flags;
	for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
		oparams->masks[i] = params->masks[i].bits[0];
	memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
	oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
	oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
	oparams->info = params->info;
	oparams->msbits = params->msbits;
	oparams->rate_num = params->rate_num;
	oparams->rate_den = params->rate_den;
	oparams->fifo_size = params->fifo_size;
}

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static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
				      struct snd_pcm_hw_params_old __user * _oparams)
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{
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	struct snd_pcm_hw_params *params;
	struct snd_pcm_hw_params_old *oparams = NULL;
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	int err;

	params = kmalloc(sizeof(*params), GFP_KERNEL);
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	if (!params)
		return -ENOMEM;
L
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3523

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	oparams = memdup_user(_oparams, sizeof(*oparams));
	if (IS_ERR(oparams)) {
		err = PTR_ERR(oparams);
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		goto out;
	}
	snd_pcm_hw_convert_from_old_params(params, oparams);
	err = snd_pcm_hw_refine(substream, params);
	snd_pcm_hw_convert_to_old_params(oparams, params);
	if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
		if (!err)
			err = -EFAULT;
	}
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	kfree(oparams);
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out:
	kfree(params);
	return err;
}

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static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
				      struct snd_pcm_hw_params_old __user * _oparams)
L
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{
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	struct snd_pcm_hw_params *params;
	struct snd_pcm_hw_params_old *oparams = NULL;
L
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3548 3549 3550
	int err;

	params = kmalloc(sizeof(*params), GFP_KERNEL);
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	if (!params)
		return -ENOMEM;

	oparams = memdup_user(_oparams, sizeof(*oparams));
	if (IS_ERR(oparams)) {
		err = PTR_ERR(oparams);
L
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		goto out;
	}
	snd_pcm_hw_convert_from_old_params(params, oparams);
	err = snd_pcm_hw_params(substream, params);
	snd_pcm_hw_convert_to_old_params(oparams, params);
	if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
		if (!err)
			err = -EFAULT;
	}
L
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3566 3567

	kfree(oparams);
L
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out:
	kfree(params);
	return err;
}
3572
#endif /* CONFIG_SND_SUPPORT_OLD_API */
L
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3573

3574
#ifndef CONFIG_MMU
3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593
static unsigned long snd_pcm_get_unmapped_area(struct file *file,
					       unsigned long addr,
					       unsigned long len,
					       unsigned long pgoff,
					       unsigned long flags)
{
	struct snd_pcm_file *pcm_file = file->private_data;
	struct snd_pcm_substream *substream = pcm_file->substream;
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned long offset = pgoff << PAGE_SHIFT;

	switch (offset) {
	case SNDRV_PCM_MMAP_OFFSET_STATUS:
		return (unsigned long)runtime->status;
	case SNDRV_PCM_MMAP_OFFSET_CONTROL:
		return (unsigned long)runtime->control;
	default:
		return (unsigned long)runtime->dma_area + offset;
	}
3594 3595
}
#else
3596
# define snd_pcm_get_unmapped_area NULL
3597 3598
#endif

L
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/*
 *  Register section
 */

3603
const struct file_operations snd_pcm_f_ops[2] = {
L
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3604
	{
3605 3606
		.owner =		THIS_MODULE,
		.write =		snd_pcm_write,
3607
		.aio_write =		snd_pcm_aio_write,
3608
		.open =			snd_pcm_playback_open,
3609
		.release =		snd_pcm_release,
T
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3610
		.llseek =		no_llseek,
3611 3612 3613 3614 3615
		.poll =			snd_pcm_playback_poll,
		.unlocked_ioctl =	snd_pcm_playback_ioctl,
		.compat_ioctl = 	snd_pcm_ioctl_compat,
		.mmap =			snd_pcm_mmap,
		.fasync =		snd_pcm_fasync,
3616
		.get_unmapped_area =	snd_pcm_get_unmapped_area,
L
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3617 3618
	},
	{
3619 3620
		.owner =		THIS_MODULE,
		.read =			snd_pcm_read,
3621
		.aio_read =		snd_pcm_aio_read,
3622
		.open =			snd_pcm_capture_open,
3623
		.release =		snd_pcm_release,
T
Takashi Iwai 已提交
3624
		.llseek =		no_llseek,
3625 3626 3627 3628 3629
		.poll =			snd_pcm_capture_poll,
		.unlocked_ioctl =	snd_pcm_capture_ioctl,
		.compat_ioctl = 	snd_pcm_ioctl_compat,
		.mmap =			snd_pcm_mmap,
		.fasync =		snd_pcm_fasync,
3630
		.get_unmapped_area =	snd_pcm_get_unmapped_area,
L
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3631 3632
	}
};