pcm_native.c 97.7 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>

/*
 *  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;
}

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static bool hw_support_mmap(struct snd_pcm_substream *substream)
{
	if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
		return false;
	/* check architectures that return -EINVAL from dma_mmap_coherent() */
	/* FIXME: this should be some global flag */
#if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\
	defined(CONFIG_PARISC) || defined(CONFIG_XTENSA)
	if (!substream->ops->mmap &&
	    substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
		return false;
#endif
	return true;
}

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#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;
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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;
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	if (!params->info) {
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		params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
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		if (!hw_support_mmap(substream))
			params->info &= ~(SNDRV_PCM_INFO_MMAP |
					  SNDRV_PCM_INFO_MMAP_VALID);
	}
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	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 */
548
	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;

579 580
	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);
592
	if (atomic_read(&substream->mmap_count))
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		return -EBADFD;
	if (substream->ops->hw_free)
		result = substream->ops->hw_free(substream);
596
	snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
597
	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;
605
	int err;
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607 608
	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;
679
	if (snd_pcm_running(substream)) {
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		snd_pcm_update_hw_ptr(substream);
681 682
		if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
			status->tstamp = runtime->status->tstamp;
683 684
			status->audio_tstamp =
				runtime->status->audio_tstamp;
685 686 687
			goto _tstamp_end;
		}
	}
688
	snd_pcm_gettime(runtime, &status->tstamp);
689
 _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;
800
	int res = 0, depth = 1;
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802
	snd_pcm_group_for_each_entry(s, substream) {
803 804
		if (do_lock && s != substream) {
			if (s->pcm->nonatomic)
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				mutex_lock_nested(&s->self_group.mutex, depth);
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			else
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				spin_lock_nested(&s->self_group.lock, depth);
			depth++;
809
		}
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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 */
834
		snd_pcm_group_for_each_entry(s1, substream) {
835
			if (s1 != substream) {
836
				if (s1->pcm->nonatomic)
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					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;
}

868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888
/* 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;

898 899 900
	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;
}

915 916 917 918 919 920 921 922 923
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);
924
		mutex_lock(&substream->self_group.mutex);
925 926 927 928 929 930 931 932 933 934 935 936
		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;

946 947 948
	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);
1014
	runtime->hw_ptr_jiffies = jiffies;
1015 1016
	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
};

/**
1034
 * snd_pcm_start - start all linked streams
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 * @substream: the PCM substream instance
1036 1037
 *
 * 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);
1076
	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
};

/**
1086
 * 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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 *
1090
 * The state of each stream is then changed to the given state unconditionally.
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 *
1092
 * 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);
}

1099 1100
EXPORT_SYMBOL(snd_pcm_stop);

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/**
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 * 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;
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	/* some drivers might use hw_ptr to recover from the pause -
	   update the hw_ptr now */
	if (push)
		snd_pcm_update_hw_ptr(substream);
1141
	/* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1142
	 * a delta between the current jiffies, this gives a large enough
1143 1144 1145
	 * 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);
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		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);
1228
	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
};

/**
1238
 * 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.
1242 1243 1244
 *
 * 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;

1251 1252 1253
	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;
}

1260 1261
EXPORT_SYMBOL(snd_pcm_suspend);

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/**
1263
 * 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.
1267 1268
 *
 * 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;

1275 1276 1277
	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;
}

1292 1293
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);
1348
	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) {
1376
		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;
1422 1423
	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
 */
1452 1453 1454
/* we use the second argument for updating f_flags */
static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
			       int f_flags)
L
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
1457 1458
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
	    runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
L
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		return -EBADFD;
	if (snd_pcm_running(substream))
		return -EBUSY;
1462
	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;
1479
	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
};

/**
1489
 * snd_pcm_prepare - prepare the PCM substream to be triggerable
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 * @substream: the PCM substream instance
1491
 * @file: file to refer f_flags
1492 1493
 *
 * Return: Zero if successful, or a negative error code.
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 */
1495 1496
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;
1500 1501 1502 1503 1504 1505
	int f_flags;

	if (file)
		f_flags = file->f_flags;
	else
		f_flags = substream->f_flags;
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	snd_power_lock(card);
1508
	if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1509 1510
		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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{
1521 1522 1523 1524 1525 1526 1527 1528
	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)
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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;
1547 1548 1549
		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) {
1556
			int new_state = snd_pcm_capture_avail(runtime) > 0 ?
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				SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1558 1559
			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.
 */
1584 1585
static int snd_pcm_drain(struct snd_pcm_substream *substream,
			 struct file *file)
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{
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	struct snd_card *card;
	struct snd_pcm_runtime *runtime;
1589
	struct snd_pcm_substream *s;
1590
	wait_queue_t wait;
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	int result = 0;
1592
	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) {
1602
		result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1603 1604 1605 1606
		if (result < 0) {
			snd_power_unlock(card);
			return result;
		}
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	}

1609 1610 1611 1612 1613 1614
	if (file) {
		if (file->f_flags & O_NONBLOCK)
			nonblock = 1;
	} else if (substream->f_flags & O_NONBLOCK)
		nonblock = 1;

1615 1616 1617
	down_read(&snd_pcm_link_rwsem);
	snd_pcm_stream_lock_irq(substream);
	/* resume pause */
1618
	if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1619 1620 1621 1622
		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);
1623 1624 1625 1626 1627 1628
	if (result < 0)
		goto unlock;
	/* in non-blocking, we don't wait in ioctl but let caller poll */
	if (nonblock) {
		result = -EAGAIN;
		goto unlock;
1629
	}
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	for (;;) {
		long tout;
1633
		struct snd_pcm_runtime *to_check;
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		if (signal_pending(current)) {
			result = -ERESTARTSYS;
			break;
		}
1638 1639 1640 1641 1642 1643 1644 1645
		/* 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;
1646
				break;
1647
			}
1648
		}
1649 1650 1651 1652
		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);
1654
		up_read(&snd_pcm_link_rwsem);
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		snd_power_unlock(card);
1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666
		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);
1668
		down_read(&snd_pcm_link_rwsem);
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		snd_pcm_stream_lock_irq(substream);
1670
		remove_wait_queue(&to_check->sleep, &wait);
1671 1672 1673 1674
		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 {
1679 1680
				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;
		}
	}
1687

1688
 unlock:
1689
	snd_pcm_stream_unlock_irq(substream);
1690
	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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1704 1705
	int result = 0;
	
1706 1707
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
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	runtime = substream->runtime;

1710
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1711 1712
	    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);
1723

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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);
1731 1732
	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;
1748
	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;
1759 1760 1761 1762 1763
	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 ||
1767 1768
	    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)) {
1777
		substream->group = group;
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		group = NULL;
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		spin_lock_init(&substream->group->lock);
1780
		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);
1791
 _nolock:
1792
	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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{
1808
	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 */
1820 1821
		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)
L
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1838
{
T
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1839
	struct snd_interval t;
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1840 1841 1842 1843 1844
	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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1847
{
T
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1848
	struct snd_interval t;
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1849 1850 1851 1852 1853
	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);
}

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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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1856
{
T
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1857
	struct snd_interval t;
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1858 1859 1860 1861 1862 1863
	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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1866
{
T
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1867
	struct snd_interval t;
L
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1868 1869 1870 1871 1872 1873
	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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static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
				  struct snd_pcm_hw_rule *rule)
L
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1876 1877
{
	unsigned int k;
T
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1878 1879 1880
	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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1895 1896
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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1897
{
T
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1898
	struct snd_interval t;
L
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1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926
	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 };

1927 1928 1929 1930 1931
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
Linus Torvalds 已提交
1934
{
T
Takashi Iwai 已提交
1935
	struct snd_pcm_hardware *hw = rule->private;
L
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1936
	return snd_interval_list(hw_param_interval(params, rule->var),
1937 1938
				 snd_pcm_known_rates.count,
				 snd_pcm_known_rates.list, hw->rates);
L
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1939 1940
}		

T
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1941 1942
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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1943
{
T
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1944 1945
	struct snd_interval t;
	struct snd_pcm_substream *substream = rule->private;
L
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	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);
}		

T
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1954
int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
L
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1955
{
T
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1956 1957
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
L
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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 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077
	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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2078
int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
L
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2079
{
T
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2080 2081
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_pcm_hardware *hw = &runtime->hw;
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2082 2083 2084 2085 2086 2087 2088
	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;
2089
	if (hw_support_mmap(substream)) {
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2090 2091 2092 2093 2094 2095 2096 2097
		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);
2098 2099
	if (err < 0)
		return err;
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	err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2102 2103
	if (err < 0)
		return err;
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2104 2105

	err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2106 2107
	if (err < 0)
		return err;
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2108 2109 2110

	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
					   hw->channels_min, hw->channels_max);
2111 2112
	if (err < 0)
		return err;
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2113 2114 2115

	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
					   hw->rate_min, hw->rate_max);
2116 2117
	if (err < 0)
		return err;
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2118 2119 2120

	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
					   hw->period_bytes_min, hw->period_bytes_max);
2121 2122
	if (err < 0)
		return err;
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2123 2124 2125

	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
					   hw->periods_min, hw->periods_max);
2126 2127
	if (err < 0)
		return err;
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2128 2129 2130

	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
					   hw->period_bytes_min, hw->buffer_bytes_max);
2131 2132
	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);
2143
		if (err < 0)
2144
			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;
}

2161
static void pcm_release_private(struct snd_pcm_substream *substream)
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{
	snd_pcm_unlink(substream);
2164 2165 2166 2167
}

void snd_pcm_release_substream(struct snd_pcm_substream *substream)
{
2168 2169 2170 2171
	substream->ref_count--;
	if (substream->ref_count > 0)
		return;

2172 2173
	snd_pcm_drop(substream);
	if (substream->hw_opened) {
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		if (substream->ops->hw_free != NULL)
			substream->ops->hw_free(substream);
		substream->ops->close(substream);
2177
		substream->hw_opened = 0;
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	}
2179 2180
	if (pm_qos_request_active(&substream->latency_pm_qos_req))
		pm_qos_remove_request(&substream->latency_pm_qos_req);
2181 2182 2183 2184
	if (substream->pcm_release) {
		substream->pcm_release(substream);
		substream->pcm_release = NULL;
	}
2185 2186 2187
	snd_pcm_detach_substream(substream);
}

2188 2189
EXPORT_SYMBOL(snd_pcm_release_substream);

2190 2191 2192 2193 2194 2195 2196 2197 2198 2199
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;
2200 2201 2202 2203 2204
	if (substream->ref_count > 1) {
		*rsubstream = substream;
		return 0;
	}

2205 2206
	err = snd_pcm_hw_constraints_init(substream);
	if (err < 0) {
2207
		pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2208 2209 2210 2211 2212 2213 2214 2215 2216 2217
		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) {
2218
		pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2219 2220 2221 2222
		goto error;
	}

	*rsubstream = substream;
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	return 0;
2224 2225 2226 2227

 error:
	snd_pcm_release_substream(substream);
	return err;
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2228 2229
}

2230 2231
EXPORT_SYMBOL(snd_pcm_open_substream);

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static int snd_pcm_open_file(struct file *file,
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			     struct snd_pcm *pcm,
2234
			     int stream)
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2235
{
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	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
2238
	int err;
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2240 2241 2242 2243
	err = snd_pcm_open_substream(pcm, stream, file, &substream);
	if (err < 0)
		return err;

2244 2245 2246 2247 2248 2249 2250
	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) {
2251 2252
		substream->file = pcm_file;
		substream->pcm_release = pcm_release_private;
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2253 2254
	}
	file->private_data = pcm_file;
2255

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2256 2257 2258
	return 0;
}

2259 2260 2261
static int snd_pcm_playback_open(struct inode *inode, struct file *file)
{
	struct snd_pcm *pcm;
T
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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_PLAYBACK);
2267
	err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
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2268 2269
	if (pcm)
		snd_card_unref(pcm->card);
2270
	return err;
2271 2272 2273
}

static int snd_pcm_capture_open(struct inode *inode, struct file *file)
L
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2274
{
T
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2275
	struct snd_pcm *pcm;
T
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2276 2277 2278
	int err = nonseekable_open(inode, file);
	if (err < 0)
		return err;
2279 2280
	pcm = snd_lookup_minor_data(iminor(inode),
				    SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2281
	err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
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2282 2283
	if (pcm)
		snd_card_unref(pcm->card);
2284
	return err;
2285 2286 2287 2288 2289
}

static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
{
	int err;
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2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304
	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);
2305
	mutex_lock(&pcm->open_mutex);
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	while (1) {
2307
		err = snd_pcm_open_file(file, pcm, stream);
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2308 2309 2310 2311 2312 2313 2314 2315 2316 2317
		if (err >= 0)
			break;
		if (err == -EAGAIN) {
			if (file->f_flags & O_NONBLOCK) {
				err = -EBUSY;
				break;
			}
		} else
			break;
		set_current_state(TASK_INTERRUPTIBLE);
2318
		mutex_unlock(&pcm->open_mutex);
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2319
		schedule();
2320
		mutex_lock(&pcm->open_mutex);
2321 2322 2323 2324
		if (pcm->card->shutdown) {
			err = -ENODEV;
			break;
		}
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2325 2326 2327 2328 2329 2330
		if (signal_pending(current)) {
			err = -ERESTARTSYS;
			break;
		}
	}
	remove_wait_queue(&pcm->open_wait, &wait);
2331
	mutex_unlock(&pcm->open_mutex);
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2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345
	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
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2346 2347 2348
	struct snd_pcm *pcm;
	struct snd_pcm_substream *substream;
	struct snd_pcm_file *pcm_file;
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2349 2350 2351

	pcm_file = file->private_data;
	substream = pcm_file->substream;
2352 2353
	if (snd_BUG_ON(!substream))
		return -ENXIO;
L
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2354
	pcm = substream->pcm;
2355
	mutex_lock(&pcm->open_mutex);
2356
	snd_pcm_release_substream(substream);
2357
	kfree(pcm_file);
2358
	mutex_unlock(&pcm->open_mutex);
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2359 2360 2361 2362 2363 2364
	wake_up(&pcm->open_wait);
	module_put(pcm->card->module);
	snd_card_file_remove(pcm->card, file);
	return 0;
}

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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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2367
{
T
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2368
	struct snd_pcm_runtime *runtime = substream->runtime;
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2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387
	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;
2388 2389 2390
	case SNDRV_PCM_STATE_SUSPENDED:
		ret = -ESTRPIPE;
		goto __end;
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2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412
	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
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2413 2414
static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
						snd_pcm_uframes_t frames)
L
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2415
{
T
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2416
	struct snd_pcm_runtime *runtime = substream->runtime;
L
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2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435
	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;
2436 2437 2438
	case SNDRV_PCM_STATE_SUSPENDED:
		ret = -ESTRPIPE;
		goto __end;
L
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2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460
	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;
}

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static snd_pcm_sframes_t snd_pcm_playback_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_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;
2485 2486 2487
	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)
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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;
2534 2535 2536
	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)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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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)
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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);
2614
		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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{
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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;
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	if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
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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;
}
2670 2671 2672 2673 2674 2675 2676 2677 2678 2679

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;
2680
	runtime->tstamp_type = arg;
2681 2682
	return 0;
}
L
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2684 2685
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);
2693 2694
	case SNDRV_PCM_IOCTL_TSTAMP:	/* just for compatibility */
		return 0;
2695 2696
	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:
2710
		return snd_pcm_prepare(substream, file);
L
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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);
2729
#ifdef CONFIG_SND_SUPPORT_OLD_API
L
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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);
2734
#endif
L
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	case SNDRV_PCM_IOCTL_DRAIN:
2736
		return snd_pcm_drain(substream, file);
L
Linus Torvalds 已提交
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	case SNDRV_PCM_IOCTL_DROP:
		return snd_pcm_drop(substream);
2739 2740 2741 2742 2743 2744 2745 2746
	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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2747
	}
2748
	pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
L
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	return -ENOTTY;
}

2752 2753
static int snd_pcm_playback_ioctl1(struct file *file,
				   struct snd_pcm_substream *substream,
L
Linus Torvalds 已提交
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				   unsigned int cmd, void __user *arg)
{
2756 2757 2758 2759
	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;
L
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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
Takashi Iwai 已提交
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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;
L
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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;
	}
	}
2829
	return snd_pcm_common_ioctl1(file, substream, cmd, arg);
L
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}

2832 2833
static int snd_pcm_capture_ioctl1(struct file *file,
				  struct snd_pcm_substream *substream,
L
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2834 2835
				  unsigned int cmd, void __user *arg)
{
2836 2837 2838 2839
	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
Takashi Iwai 已提交
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		struct snd_xferi xferi;
		struct snd_xferi __user *_xferi = arg;
		struct snd_pcm_runtime *runtime = substream->runtime;
L
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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
Takashi Iwai 已提交
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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;
	}
	}
2909
	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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2915
	struct snd_pcm_file *pcm_file;
L
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2916 2917 2918 2919 2920 2921

	pcm_file = file->private_data;

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

2922 2923
	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
Linus Torvalds 已提交
2928
{
T
Takashi Iwai 已提交
2929
	struct snd_pcm_file *pcm_file;
L
Linus Torvalds 已提交
2930 2931 2932 2933 2934 2935

	pcm_file = file->private_data;

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

2936 2937
	return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
				      (void __user *)arg);
L
Linus Torvalds 已提交
2938 2939
}

T
Takashi Iwai 已提交
2940 2941
int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
			 unsigned int cmd, void *arg)
L
Linus Torvalds 已提交
2942 2943 2944 2945 2946 2947 2948
{
	mm_segment_t fs;
	int result;
	
	fs = snd_enter_user();
	switch (substream->stream) {
	case SNDRV_PCM_STREAM_PLAYBACK:
2949 2950
		result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
						 (void __user *)arg);
T
Takashi Iwai 已提交
2951
		break;
L
Linus Torvalds 已提交
2952
	case SNDRV_PCM_STREAM_CAPTURE:
2953 2954
		result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
						(void __user *)arg);
T
Takashi Iwai 已提交
2955
		break;
L
Linus Torvalds 已提交
2956
	default:
T
Takashi Iwai 已提交
2957 2958
		result = -EINVAL;
		break;
L
Linus Torvalds 已提交
2959
	}
T
Takashi Iwai 已提交
2960 2961
	snd_leave_user(fs);
	return result;
L
Linus Torvalds 已提交
2962 2963
}

2964 2965
EXPORT_SYMBOL(snd_pcm_kernel_ioctl);

T
Takashi Iwai 已提交
2966 2967
static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
			    loff_t * offset)
L
Linus Torvalds 已提交
2968
{
T
Takashi Iwai 已提交
2969 2970 2971
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
2972 2973 2974 2975
	snd_pcm_sframes_t result;

	pcm_file = file->private_data;
	substream = pcm_file->substream;
2976 2977
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989
	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
2990 2991
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
2992
{
T
Takashi Iwai 已提交
2993 2994 2995
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
2996 2997 2998 2999
	snd_pcm_sframes_t result;

	pcm_file = file->private_data;
	substream = pcm_file->substream;
3000 3001
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
3002
	runtime = substream->runtime;
3003 3004 3005 3006
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
	if (!frame_aligned(runtime, count))
		return -EINVAL;
L
Linus Torvalds 已提交
3007 3008 3009 3010 3011 3012 3013
	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;
}

3014 3015
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
3016 3017

{
T
Takashi Iwai 已提交
3018 3019 3020
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3021 3022 3023 3024 3025
	snd_pcm_sframes_t result;
	unsigned long i;
	void __user **bufs;
	snd_pcm_uframes_t frames;

3026
	pcm_file = iocb->ki_filp->private_data;
L
Linus Torvalds 已提交
3027
	substream = pcm_file->substream;
3028 3029
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
3030 3031 3032
	runtime = substream->runtime;
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
3033
	if (nr_segs > 1024 || nr_segs != runtime->channels)
L
Linus Torvalds 已提交
3034
		return -EINVAL;
3035
	if (!frame_aligned(runtime, iov->iov_len))
L
Linus Torvalds 已提交
3036
		return -EINVAL;
3037 3038
	frames = bytes_to_samples(runtime, iov->iov_len);
	bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
L
Linus Torvalds 已提交
3039 3040
	if (bufs == NULL)
		return -ENOMEM;
3041 3042
	for (i = 0; i < nr_segs; ++i)
		bufs[i] = iov[i].iov_base;
L
Linus Torvalds 已提交
3043 3044 3045 3046 3047 3048 3049
	result = snd_pcm_lib_readv(substream, bufs, frames);
	if (result > 0)
		result = frames_to_bytes(runtime, result);
	kfree(bufs);
	return result;
}

3050 3051
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
3052
{
T
Takashi Iwai 已提交
3053 3054 3055
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3056 3057 3058 3059 3060
	snd_pcm_sframes_t result;
	unsigned long i;
	void __user **bufs;
	snd_pcm_uframes_t frames;

3061
	pcm_file = iocb->ki_filp->private_data;
L
Linus Torvalds 已提交
3062
	substream = pcm_file->substream;
3063 3064
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
3065
	runtime = substream->runtime;
3066 3067
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
3068
	if (nr_segs > 128 || nr_segs != runtime->channels ||
3069 3070
	    !frame_aligned(runtime, iov->iov_len))
		return -EINVAL;
3071 3072
	frames = bytes_to_samples(runtime, iov->iov_len);
	bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
L
Linus Torvalds 已提交
3073 3074
	if (bufs == NULL)
		return -ENOMEM;
3075 3076
	for (i = 0; i < nr_segs; ++i)
		bufs[i] = iov[i].iov_base;
L
Linus Torvalds 已提交
3077 3078 3079 3080 3081 3082 3083 3084 3085
	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
3086 3087 3088
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3089 3090 3091 3092 3093 3094
        unsigned int mask;
	snd_pcm_uframes_t avail;

	pcm_file = file->private_data;

	substream = pcm_file->substream;
3095 3096
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124
	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
3125 3126 3127
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3128 3129 3130 3131 3132 3133
        unsigned int mask;
	snd_pcm_uframes_t avail;

	pcm_file = file->private_data;

	substream = pcm_file->substream;
3134 3135
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
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 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177
	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
3178 3179
static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
						struct vm_fault *vmf)
L
Linus Torvalds 已提交
3180
{
T
Takashi Iwai 已提交
3181 3182
	struct snd_pcm_substream *substream = area->vm_private_data;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3183 3184
	
	if (substream == NULL)
N
Nick Piggin 已提交
3185
		return VM_FAULT_SIGBUS;
L
Linus Torvalds 已提交
3186
	runtime = substream->runtime;
N
Nick Piggin 已提交
3187 3188 3189
	vmf->page = virt_to_page(runtime->status);
	get_page(vmf->page);
	return 0;
L
Linus Torvalds 已提交
3190 3191
}

3192
static const struct vm_operations_struct snd_pcm_vm_ops_status =
L
Linus Torvalds 已提交
3193
{
N
Nick Piggin 已提交
3194
	.fault =	snd_pcm_mmap_status_fault,
L
Linus Torvalds 已提交
3195 3196
};

T
Takashi Iwai 已提交
3197
static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
L
Linus Torvalds 已提交
3198 3199 3200 3201 3202 3203
			       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
3204
	if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
L
Linus Torvalds 已提交
3205 3206 3207
		return -EINVAL;
	area->vm_ops = &snd_pcm_vm_ops_status;
	area->vm_private_data = substream;
3208
	area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
L
Linus Torvalds 已提交
3209 3210 3211 3212 3213 3214
	return 0;
}

/*
 * mmap control record
 */
N
Nick Piggin 已提交
3215 3216
static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
						struct vm_fault *vmf)
L
Linus Torvalds 已提交
3217
{
T
Takashi Iwai 已提交
3218 3219
	struct snd_pcm_substream *substream = area->vm_private_data;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3220 3221
	
	if (substream == NULL)
N
Nick Piggin 已提交
3222
		return VM_FAULT_SIGBUS;
L
Linus Torvalds 已提交
3223
	runtime = substream->runtime;
N
Nick Piggin 已提交
3224 3225 3226
	vmf->page = virt_to_page(runtime->control);
	get_page(vmf->page);
	return 0;
L
Linus Torvalds 已提交
3227 3228
}

3229
static const struct vm_operations_struct snd_pcm_vm_ops_control =
L
Linus Torvalds 已提交
3230
{
N
Nick Piggin 已提交
3231
	.fault =	snd_pcm_mmap_control_fault,
L
Linus Torvalds 已提交
3232 3233
};

T
Takashi Iwai 已提交
3234
static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
L
Linus Torvalds 已提交
3235 3236 3237 3238 3239 3240
				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
3241
	if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
L
Linus Torvalds 已提交
3242 3243 3244
		return -EINVAL;
	area->vm_ops = &snd_pcm_vm_ops_control;
	area->vm_private_data = substream;
3245
	area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
L
Linus Torvalds 已提交
3246 3247 3248 3249 3250 3251
	return 0;
}
#else /* ! coherent mmap */
/*
 * don't support mmap for status and control records.
 */
T
Takashi Iwai 已提交
3252
static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
L
Linus Torvalds 已提交
3253 3254 3255 3256
			       struct vm_area_struct *area)
{
	return -ENXIO;
}
T
Takashi Iwai 已提交
3257
static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
L
Linus Torvalds 已提交
3258 3259 3260 3261 3262 3263
				struct vm_area_struct *area)
{
	return -ENXIO;
}
#endif /* coherent mmap */

3264 3265 3266 3267 3268 3269 3270
static inline struct page *
snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
{
	void *vaddr = substream->runtime->dma_area + ofs;
	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
};

/*
 * mmap the DMA buffer on RAM
 */
3315 3316
int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
			     struct vm_area_struct *area)
L
Linus Torvalds 已提交
3317
{
3318
	area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3319
#ifdef CONFIG_GENERIC_ALLOCATOR
3320 3321 3322 3323 3324 3325
	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);
	}
3326
#endif /* CONFIG_GENERIC_ALLOCATOR */
3327
#ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3328 3329 3330 3331 3332 3333 3334
	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);
3335
#endif /* CONFIG_X86 */
3336 3337
	/* mmap with fault handler */
	area->vm_ops = &snd_pcm_vm_ops_data_fault;
L
Linus Torvalds 已提交
3338 3339
	return 0;
}
3340
EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
L
Linus Torvalds 已提交
3341 3342 3343 3344 3345

/*
 * mmap the DMA buffer on I/O memory area
 */
#if SNDRV_PCM_INFO_MMAP_IOMEM
T
Takashi Iwai 已提交
3346 3347
int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
			   struct vm_area_struct *area)
L
Linus Torvalds 已提交
3348
{
3349
	struct snd_pcm_runtime *runtime = substream->runtime;;
L
Linus Torvalds 已提交
3350 3351

	area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3352
	return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
L
Linus Torvalds 已提交
3353
}
3354 3355

EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
L
Linus Torvalds 已提交
3356 3357 3358 3359 3360
#endif /* SNDRV_PCM_INFO_MMAP */

/*
 * mmap DMA buffer
 */
T
Takashi Iwai 已提交
3361
int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
L
Linus Torvalds 已提交
3362 3363
		      struct vm_area_struct *area)
{
T
Takashi Iwai 已提交
3364
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3365 3366 3367
	long size;
	unsigned long offset;
	size_t dma_bytes;
3368
	int err;
L
Linus Torvalds 已提交
3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392

	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;

3393 3394
	area->vm_ops = &snd_pcm_vm_ops_data;
	area->vm_private_data = substream;
L
Linus Torvalds 已提交
3395
	if (substream->ops->mmap)
3396
		err = substream->ops->mmap(substream, area);
L
Linus Torvalds 已提交
3397
	else
3398
		err = snd_pcm_lib_default_mmap(substream, area);
3399 3400 3401
	if (!err)
		atomic_inc(&substream->mmap_count);
	return err;
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}

3404 3405
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;
3414 3415
	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:
3420
		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:
3424
		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;
3441
	if (PCM_RUNTIME_CHECK(substream))
3442
		return -ENXIO;
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	runtime = substream->runtime;
3444
	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
 */

3460
#ifdef CONFIG_SND_SUPPORT_OLD_API
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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;
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3512

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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)
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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;

	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_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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	kfree(oparams);
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out:
	kfree(params);
	return err;
}
3561
#endif /* CONFIG_SND_SUPPORT_OLD_API */
L
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3562

3563
#ifndef CONFIG_MMU
3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582
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;
	}
3583 3584
}
#else
3585
# define snd_pcm_get_unmapped_area NULL
3586 3587
#endif

L
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/*
 *  Register section
 */

3592
const struct file_operations snd_pcm_f_ops[2] = {
L
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3593
	{
3594 3595
		.owner =		THIS_MODULE,
		.write =		snd_pcm_write,
3596
		.aio_write =		snd_pcm_aio_write,
3597
		.open =			snd_pcm_playback_open,
3598
		.release =		snd_pcm_release,
T
Takashi Iwai 已提交
3599
		.llseek =		no_llseek,
3600 3601 3602 3603 3604
		.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,
3605
		.get_unmapped_area =	snd_pcm_get_unmapped_area,
L
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	},
	{
3608 3609
		.owner =		THIS_MODULE,
		.read =			snd_pcm_read,
3610
		.aio_read =		snd_pcm_aio_read,
3611
		.open =			snd_pcm_capture_open,
3612
		.release =		snd_pcm_release,
T
Takashi Iwai 已提交
3613
		.llseek =		no_llseek,
3614 3615 3616 3617 3618
		.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,
3619
		.get_unmapped_area =	snd_pcm_get_unmapped_area,
L
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3620 3621
	}
};