pcm_lib.c 71.2 KB
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/*
 *  Digital Audio (PCM) abstract layer
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 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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 *                   Abramo Bagnara <abramo@alsa-project.org>
 *
 *
 *   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/slab.h>
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#include <linux/sched/signal.h>
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#include <linux/time.h>
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#include <linux/math64.h>
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#include <linux/export.h>
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#include <sound/core.h>
#include <sound/control.h>
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#include <sound/tlv.h>
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#include <sound/info.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/timer.h>

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#ifdef CONFIG_SND_PCM_XRUN_DEBUG
#define CREATE_TRACE_POINTS
#include "pcm_trace.h"
#else
#define trace_hwptr(substream, pos, in_interrupt)
#define trace_xrun(substream)
#define trace_hw_ptr_error(substream, reason)
#endif

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/*
 * fill ring buffer with silence
 * runtime->silence_start: starting pointer to silence area
 * runtime->silence_filled: size filled with silence
 * runtime->silence_threshold: threshold from application
 * runtime->silence_size: maximal size from application
 *
 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
 */
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void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	snd_pcm_uframes_t frames, ofs, transfer;

	if (runtime->silence_size < runtime->boundary) {
		snd_pcm_sframes_t noise_dist, n;
		if (runtime->silence_start != runtime->control->appl_ptr) {
			n = runtime->control->appl_ptr - runtime->silence_start;
			if (n < 0)
				n += runtime->boundary;
			if ((snd_pcm_uframes_t)n < runtime->silence_filled)
				runtime->silence_filled -= n;
			else
				runtime->silence_filled = 0;
			runtime->silence_start = runtime->control->appl_ptr;
		}
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		if (runtime->silence_filled >= runtime->buffer_size)
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			return;
		noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
		if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
			return;
		frames = runtime->silence_threshold - noise_dist;
		if (frames > runtime->silence_size)
			frames = runtime->silence_size;
	} else {
		if (new_hw_ptr == ULONG_MAX) {	/* initialization */
			snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
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			if (avail > runtime->buffer_size)
				avail = runtime->buffer_size;
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			runtime->silence_filled = avail > 0 ? avail : 0;
			runtime->silence_start = (runtime->status->hw_ptr +
						  runtime->silence_filled) %
						 runtime->boundary;
		} else {
			ofs = runtime->status->hw_ptr;
			frames = new_hw_ptr - ofs;
			if ((snd_pcm_sframes_t)frames < 0)
				frames += runtime->boundary;
			runtime->silence_filled -= frames;
			if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
				runtime->silence_filled = 0;
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				runtime->silence_start = new_hw_ptr;
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			} else {
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				runtime->silence_start = ofs;
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			}
		}
		frames = runtime->buffer_size - runtime->silence_filled;
	}
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	if (snd_BUG_ON(frames > runtime->buffer_size))
		return;
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	if (frames == 0)
		return;
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	ofs = runtime->silence_start % runtime->buffer_size;
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	while (frames > 0) {
		transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
		if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
		    runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
			if (substream->ops->silence) {
				int err;
				err = substream->ops->silence(substream, -1, ofs, transfer);
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				snd_BUG_ON(err < 0);
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			} else {
				char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
				snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
			}
		} else {
			unsigned int c;
			unsigned int channels = runtime->channels;
			if (substream->ops->silence) {
				for (c = 0; c < channels; ++c) {
					int err;
					err = substream->ops->silence(substream, c, ofs, transfer);
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					snd_BUG_ON(err < 0);
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				}
			} else {
				size_t dma_csize = runtime->dma_bytes / channels;
				for (c = 0; c < channels; ++c) {
					char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
					snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
				}
			}
		}
		runtime->silence_filled += transfer;
		frames -= transfer;
		ofs = 0;
	}
}

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#ifdef CONFIG_SND_DEBUG
void snd_pcm_debug_name(struct snd_pcm_substream *substream,
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			   char *name, size_t len)
{
	snprintf(name, len, "pcmC%dD%d%c:%d",
		 substream->pcm->card->number,
		 substream->pcm->device,
		 substream->stream ? 'c' : 'p',
		 substream->number);
}
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EXPORT_SYMBOL(snd_pcm_debug_name);
#endif
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#define XRUN_DEBUG_BASIC	(1<<0)
#define XRUN_DEBUG_STACK	(1<<1)	/* dump also stack */
#define XRUN_DEBUG_JIFFIESCHECK	(1<<2)	/* do jiffies check */

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#ifdef CONFIG_SND_PCM_XRUN_DEBUG
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#define xrun_debug(substream, mask) \
			((substream)->pstr->xrun_debug & (mask))
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#else
#define xrun_debug(substream, mask)	0
#endif
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#define dump_stack_on_xrun(substream) do {			\
		if (xrun_debug(substream, XRUN_DEBUG_STACK))	\
			dump_stack();				\
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	} while (0)

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static void xrun(struct snd_pcm_substream *substream)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;

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	trace_xrun(substream);
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	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
		snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
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	snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
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	if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
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		char name[16];
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		snd_pcm_debug_name(substream, name, sizeof(name));
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		pcm_warn(substream->pcm, "XRUN: %s\n", name);
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		dump_stack_on_xrun(substream);
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	}
}

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#ifdef CONFIG_SND_PCM_XRUN_DEBUG
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#define hw_ptr_error(substream, in_interrupt, reason, fmt, args...)	\
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	do {								\
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		trace_hw_ptr_error(substream, reason);	\
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		if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {		\
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			pr_err_ratelimited("ALSA: PCM: [%c] " reason ": " fmt, \
					   (in_interrupt) ? 'Q' : 'P', ##args);	\
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			dump_stack_on_xrun(substream);			\
		}							\
	} while (0)

#else /* ! CONFIG_SND_PCM_XRUN_DEBUG */

#define hw_ptr_error(substream, fmt, args...) do { } while (0)

#endif

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int snd_pcm_update_state(struct snd_pcm_substream *substream,
			 struct snd_pcm_runtime *runtime)
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{
	snd_pcm_uframes_t avail;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		avail = snd_pcm_playback_avail(runtime);
	else
		avail = snd_pcm_capture_avail(runtime);
	if (avail > runtime->avail_max)
		runtime->avail_max = avail;
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	if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
		if (avail >= runtime->buffer_size) {
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			snd_pcm_drain_done(substream);
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			return -EPIPE;
		}
	} else {
		if (avail >= runtime->stop_threshold) {
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			xrun(substream);
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			return -EPIPE;
		}
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	}
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	if (runtime->twake) {
		if (avail >= runtime->twake)
			wake_up(&runtime->tsleep);
	} else if (avail >= runtime->control->avail_min)
		wake_up(&runtime->sleep);
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	return 0;
}

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static void update_audio_tstamp(struct snd_pcm_substream *substream,
				struct timespec *curr_tstamp,
				struct timespec *audio_tstamp)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	u64 audio_frames, audio_nsecs;
	struct timespec driver_tstamp;

	if (runtime->tstamp_mode != SNDRV_PCM_TSTAMP_ENABLE)
		return;

	if (!(substream->ops->get_time_info) ||
		(runtime->audio_tstamp_report.actual_type ==
			SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {

		/*
		 * provide audio timestamp derived from pointer position
		 * add delay only if requested
		 */

		audio_frames = runtime->hw_ptr_wrap + runtime->status->hw_ptr;

		if (runtime->audio_tstamp_config.report_delay) {
			if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
				audio_frames -=  runtime->delay;
			else
				audio_frames +=  runtime->delay;
		}
		audio_nsecs = div_u64(audio_frames * 1000000000LL,
				runtime->rate);
		*audio_tstamp = ns_to_timespec(audio_nsecs);
	}
	runtime->status->audio_tstamp = *audio_tstamp;
	runtime->status->tstamp = *curr_tstamp;

	/*
	 * re-take a driver timestamp to let apps detect if the reference tstamp
	 * read by low-level hardware was provided with a delay
	 */
	snd_pcm_gettime(substream->runtime, (struct timespec *)&driver_tstamp);
	runtime->driver_tstamp = driver_tstamp;
}

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static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
				  unsigned int in_interrupt)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	snd_pcm_uframes_t pos;
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	snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
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	snd_pcm_sframes_t hdelta, delta;
	unsigned long jdelta;
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	unsigned long curr_jiffies;
	struct timespec curr_tstamp;
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	struct timespec audio_tstamp;
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	int crossed_boundary = 0;
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	old_hw_ptr = runtime->status->hw_ptr;
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	/*
	 * group pointer, time and jiffies reads to allow for more
	 * accurate correlations/corrections.
	 * The values are stored at the end of this routine after
	 * corrections for hw_ptr position
	 */
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	pos = substream->ops->pointer(substream);
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	curr_jiffies = jiffies;
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	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
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		if ((substream->ops->get_time_info) &&
			(runtime->audio_tstamp_config.type_requested != SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
			substream->ops->get_time_info(substream, &curr_tstamp,
						&audio_tstamp,
						&runtime->audio_tstamp_config,
						&runtime->audio_tstamp_report);

			/* re-test in case tstamp type is not supported in hardware and was demoted to DEFAULT */
			if (runtime->audio_tstamp_report.actual_type == SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)
				snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
		} else
			snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
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	}

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	if (pos == SNDRV_PCM_POS_XRUN) {
		xrun(substream);
		return -EPIPE;
	}
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	if (pos >= runtime->buffer_size) {
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		if (printk_ratelimit()) {
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			char name[16];
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			snd_pcm_debug_name(substream, name, sizeof(name));
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			pcm_err(substream->pcm,
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				"invalid position: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
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				name, pos, runtime->buffer_size,
				runtime->period_size);
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		}
		pos = 0;
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	}
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	pos -= pos % runtime->min_align;
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	trace_hwptr(substream, pos, in_interrupt);
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	hw_base = runtime->hw_ptr_base;
	new_hw_ptr = hw_base + pos;
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	if (in_interrupt) {
		/* we know that one period was processed */
		/* delta = "expected next hw_ptr" for in_interrupt != 0 */
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		delta = runtime->hw_ptr_interrupt + runtime->period_size;
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		if (delta > new_hw_ptr) {
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			/* check for double acknowledged interrupts */
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			hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
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			if (hdelta > runtime->hw_ptr_buffer_jiffies/2 + 1) {
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				hw_base += runtime->buffer_size;
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				if (hw_base >= runtime->boundary) {
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					hw_base = 0;
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					crossed_boundary++;
				}
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				new_hw_ptr = hw_base + pos;
				goto __delta;
			}
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		}
	}
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	/* new_hw_ptr might be lower than old_hw_ptr in case when */
	/* pointer crosses the end of the ring buffer */
	if (new_hw_ptr < old_hw_ptr) {
		hw_base += runtime->buffer_size;
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		if (hw_base >= runtime->boundary) {
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			hw_base = 0;
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			crossed_boundary++;
		}
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		new_hw_ptr = hw_base + pos;
	}
      __delta:
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	delta = new_hw_ptr - old_hw_ptr;
	if (delta < 0)
		delta += runtime->boundary;
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	if (runtime->no_period_wakeup) {
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		snd_pcm_sframes_t xrun_threshold;
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		/*
		 * Without regular period interrupts, we have to check
		 * the elapsed time to detect xruns.
		 */
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		jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
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		if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
			goto no_delta_check;
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		hdelta = jdelta - delta * HZ / runtime->rate;
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		xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
		while (hdelta > xrun_threshold) {
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			delta += runtime->buffer_size;
			hw_base += runtime->buffer_size;
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			if (hw_base >= runtime->boundary) {
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				hw_base = 0;
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				crossed_boundary++;
			}
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			new_hw_ptr = hw_base + pos;
			hdelta -= runtime->hw_ptr_buffer_jiffies;
		}
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		goto no_delta_check;
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	}
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	/* something must be really wrong */
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	if (delta >= runtime->buffer_size + runtime->period_size) {
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		hw_ptr_error(substream, in_interrupt, "Unexpected hw_ptr",
			     "(stream=%i, pos=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
			     substream->stream, (long)pos,
			     (long)new_hw_ptr, (long)old_hw_ptr);
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		return 0;
	}
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	/* Do jiffies check only in xrun_debug mode */
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	if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
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		goto no_jiffies_check;

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	/* Skip the jiffies check for hardwares with BATCH flag.
	 * Such hardware usually just increases the position at each IRQ,
	 * thus it can't give any strange position.
	 */
	if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
		goto no_jiffies_check;
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	hdelta = delta;
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	if (hdelta < runtime->delay)
		goto no_jiffies_check;
	hdelta -= runtime->delay;
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	jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
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	if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
		delta = jdelta /
			(((runtime->period_size * HZ) / runtime->rate)
								+ HZ/100);
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		/* move new_hw_ptr according jiffies not pos variable */
		new_hw_ptr = old_hw_ptr;
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		hw_base = delta;
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		/* use loop to avoid checks for delta overflows */
		/* the delta value is small or zero in most cases */
		while (delta > 0) {
			new_hw_ptr += runtime->period_size;
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			if (new_hw_ptr >= runtime->boundary) {
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				new_hw_ptr -= runtime->boundary;
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				crossed_boundary--;
			}
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			delta--;
		}
		/* align hw_base to buffer_size */
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		hw_ptr_error(substream, in_interrupt, "hw_ptr skipping",
			     "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
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			     (long)pos, (long)hdelta,
			     (long)runtime->period_size, jdelta,
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			     ((hdelta * HZ) / runtime->rate), hw_base,
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			     (unsigned long)old_hw_ptr,
			     (unsigned long)new_hw_ptr);
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		/* reset values to proper state */
		delta = 0;
		hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
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	}
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 no_jiffies_check:
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	if (delta > runtime->period_size + runtime->period_size / 2) {
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		hw_ptr_error(substream, in_interrupt,
			     "Lost interrupts?",
			     "(stream=%i, delta=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
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			     substream->stream, (long)delta,
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			     (long)new_hw_ptr,
			     (long)old_hw_ptr);
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	}
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 no_delta_check:
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	if (runtime->status->hw_ptr == new_hw_ptr) {
		update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
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		return 0;
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	}
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	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
	    runtime->silence_size > 0)
		snd_pcm_playback_silence(substream, new_hw_ptr);

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	if (in_interrupt) {
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		delta = new_hw_ptr - runtime->hw_ptr_interrupt;
		if (delta < 0)
			delta += runtime->boundary;
		delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
		runtime->hw_ptr_interrupt += delta;
		if (runtime->hw_ptr_interrupt >= runtime->boundary)
			runtime->hw_ptr_interrupt -= runtime->boundary;
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	}
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	runtime->hw_ptr_base = hw_base;
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	runtime->status->hw_ptr = new_hw_ptr;
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	runtime->hw_ptr_jiffies = curr_jiffies;
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	if (crossed_boundary) {
		snd_BUG_ON(crossed_boundary != 1);
		runtime->hw_ptr_wrap += runtime->boundary;
	}
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	update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
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	return snd_pcm_update_state(substream, runtime);
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}

/* CAUTION: call it with irq disabled */
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int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
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{
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	return snd_pcm_update_hw_ptr0(substream, 0);
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}

/**
 * snd_pcm_set_ops - set the PCM operators
 * @pcm: the pcm instance
 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
 * @ops: the operator table
 *
 * Sets the given PCM operators to the pcm instance.
 */
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void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
		     const struct snd_pcm_ops *ops)
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{
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	struct snd_pcm_str *stream = &pcm->streams[direction];
	struct snd_pcm_substream *substream;
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	for (substream = stream->substream; substream != NULL; substream = substream->next)
		substream->ops = ops;
}

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EXPORT_SYMBOL(snd_pcm_set_ops);
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/**
 * snd_pcm_sync - set the PCM sync id
 * @substream: the pcm substream
 *
 * Sets the PCM sync identifier for the card.
 */
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void snd_pcm_set_sync(struct snd_pcm_substream *substream)
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{
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	struct snd_pcm_runtime *runtime = substream->runtime;
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	runtime->sync.id32[0] = substream->pcm->card->number;
	runtime->sync.id32[1] = -1;
	runtime->sync.id32[2] = -1;
	runtime->sync.id32[3] = -1;
}

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EXPORT_SYMBOL(snd_pcm_set_sync);

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/*
 *  Standard ioctl routine
 */

static inline unsigned int div32(unsigned int a, unsigned int b, 
				 unsigned int *r)
{
	if (b == 0) {
		*r = 0;
		return UINT_MAX;
	}
	*r = a % b;
	return a / b;
}

static inline unsigned int div_down(unsigned int a, unsigned int b)
{
	if (b == 0)
		return UINT_MAX;
	return a / b;
}

static inline unsigned int div_up(unsigned int a, unsigned int b)
{
	unsigned int r;
	unsigned int q;
	if (b == 0)
		return UINT_MAX;
	q = div32(a, b, &r);
	if (r)
		++q;
	return q;
}

static inline unsigned int mul(unsigned int a, unsigned int b)
{
	if (a == 0)
		return 0;
	if (div_down(UINT_MAX, a) < b)
		return UINT_MAX;
	return a * b;
}

static inline unsigned int muldiv32(unsigned int a, unsigned int b,
				    unsigned int c, unsigned int *r)
{
	u_int64_t n = (u_int64_t) a * b;
	if (c == 0) {
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		snd_BUG_ON(!n);
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		*r = 0;
		return UINT_MAX;
	}
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	n = div_u64_rem(n, c, r);
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	if (n >= UINT_MAX) {
		*r = 0;
		return UINT_MAX;
	}
	return n;
}

/**
 * snd_interval_refine - refine the interval value of configurator
 * @i: the interval value to refine
 * @v: the interval value to refer to
 *
 * Refines the interval value with the reference value.
 * The interval is changed to the range satisfying both intervals.
 * The interval status (min, max, integer, etc.) are evaluated.
 *
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 * Return: Positive if the value is changed, zero if it's not changed, or a
 * negative error code.
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 */
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int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
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{
	int changed = 0;
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	if (snd_BUG_ON(snd_interval_empty(i)))
		return -EINVAL;
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	if (i->min < v->min) {
		i->min = v->min;
		i->openmin = v->openmin;
		changed = 1;
	} else if (i->min == v->min && !i->openmin && v->openmin) {
		i->openmin = 1;
		changed = 1;
	}
	if (i->max > v->max) {
		i->max = v->max;
		i->openmax = v->openmax;
		changed = 1;
	} else if (i->max == v->max && !i->openmax && v->openmax) {
		i->openmax = 1;
		changed = 1;
	}
	if (!i->integer && v->integer) {
		i->integer = 1;
		changed = 1;
	}
	if (i->integer) {
		if (i->openmin) {
			i->min++;
			i->openmin = 0;
		}
		if (i->openmax) {
			i->max--;
			i->openmax = 0;
		}
	} else if (!i->openmin && !i->openmax && i->min == i->max)
		i->integer = 1;
	if (snd_interval_checkempty(i)) {
		snd_interval_none(i);
		return -EINVAL;
	}
	return changed;
}

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EXPORT_SYMBOL(snd_interval_refine);

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static int snd_interval_refine_first(struct snd_interval *i)
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{
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	if (snd_BUG_ON(snd_interval_empty(i)))
		return -EINVAL;
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	if (snd_interval_single(i))
		return 0;
	i->max = i->min;
	i->openmax = i->openmin;
	if (i->openmax)
		i->max++;
	return 1;
}

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static int snd_interval_refine_last(struct snd_interval *i)
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{
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	if (snd_BUG_ON(snd_interval_empty(i)))
		return -EINVAL;
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	if (snd_interval_single(i))
		return 0;
	i->min = i->max;
	i->openmin = i->openmax;
	if (i->openmin)
		i->min--;
	return 1;
}

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void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
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{
	if (a->empty || b->empty) {
		snd_interval_none(c);
		return;
	}
	c->empty = 0;
	c->min = mul(a->min, b->min);
	c->openmin = (a->openmin || b->openmin);
	c->max = mul(a->max,  b->max);
	c->openmax = (a->openmax || b->openmax);
	c->integer = (a->integer && b->integer);
}

/**
 * snd_interval_div - refine the interval value with division
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 * @a: dividend
 * @b: divisor
 * @c: quotient
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 *
 * c = a / b
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
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void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
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{
	unsigned int r;
	if (a->empty || b->empty) {
		snd_interval_none(c);
		return;
	}
	c->empty = 0;
	c->min = div32(a->min, b->max, &r);
	c->openmin = (r || a->openmin || b->openmax);
	if (b->min > 0) {
		c->max = div32(a->max, b->min, &r);
		if (r) {
			c->max++;
			c->openmax = 1;
		} else
			c->openmax = (a->openmax || b->openmin);
	} else {
		c->max = UINT_MAX;
		c->openmax = 0;
	}
	c->integer = 0;
}

/**
 * snd_interval_muldivk - refine the interval value
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 * @a: dividend 1
 * @b: dividend 2
 * @k: divisor (as integer)
 * @c: result
  *
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 * c = a * b / k
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
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void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
		      unsigned int k, struct snd_interval *c)
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{
	unsigned int r;
	if (a->empty || b->empty) {
		snd_interval_none(c);
		return;
	}
	c->empty = 0;
	c->min = muldiv32(a->min, b->min, k, &r);
	c->openmin = (r || a->openmin || b->openmin);
	c->max = muldiv32(a->max, b->max, k, &r);
	if (r) {
		c->max++;
		c->openmax = 1;
	} else
		c->openmax = (a->openmax || b->openmax);
	c->integer = 0;
}

/**
 * snd_interval_mulkdiv - refine the interval value
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 * @a: dividend 1
 * @k: dividend 2 (as integer)
 * @b: divisor
 * @c: result
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 *
 * c = a * k / b
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
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void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
		      const struct snd_interval *b, struct snd_interval *c)
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{
	unsigned int r;
	if (a->empty || b->empty) {
		snd_interval_none(c);
		return;
	}
	c->empty = 0;
	c->min = muldiv32(a->min, k, b->max, &r);
	c->openmin = (r || a->openmin || b->openmax);
	if (b->min > 0) {
		c->max = muldiv32(a->max, k, b->min, &r);
		if (r) {
			c->max++;
			c->openmax = 1;
		} else
			c->openmax = (a->openmax || b->openmin);
	} else {
		c->max = UINT_MAX;
		c->openmax = 0;
	}
	c->integer = 0;
}

/* ---- */


/**
 * snd_interval_ratnum - refine the interval value
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 * @i: interval to refine
 * @rats_count: number of ratnum_t 
 * @rats: ratnum_t array
 * @nump: pointer to store the resultant numerator
 * @denp: pointer to store the resultant denominator
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 *
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 * Return: Positive if the value is changed, zero if it's not changed, or a
 * negative error code.
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 */
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int snd_interval_ratnum(struct snd_interval *i,
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			unsigned int rats_count, const struct snd_ratnum *rats,
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			unsigned int *nump, unsigned int *denp)
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{
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	unsigned int best_num, best_den;
	int best_diff;
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	unsigned int k;
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	struct snd_interval t;
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	int err;
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	unsigned int result_num, result_den;
	int result_diff;
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	best_num = best_den = best_diff = 0;
	for (k = 0; k < rats_count; ++k) {
		unsigned int num = rats[k].num;
		unsigned int den;
		unsigned int q = i->min;
		int diff;
		if (q == 0)
			q = 1;
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		den = div_up(num, q);
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		if (den < rats[k].den_min)
			continue;
		if (den > rats[k].den_max)
			den = rats[k].den_max;
		else {
			unsigned int r;
			r = (den - rats[k].den_min) % rats[k].den_step;
			if (r != 0)
				den -= r;
		}
		diff = num - q * den;
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		if (diff < 0)
			diff = -diff;
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		if (best_num == 0 ||
		    diff * best_den < best_diff * den) {
			best_diff = diff;
			best_den = den;
			best_num = num;
		}
	}
	if (best_den == 0) {
		i->empty = 1;
		return -EINVAL;
	}
	t.min = div_down(best_num, best_den);
	t.openmin = !!(best_num % best_den);
	
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	result_num = best_num;
	result_diff = best_diff;
	result_den = best_den;
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	best_num = best_den = best_diff = 0;
	for (k = 0; k < rats_count; ++k) {
		unsigned int num = rats[k].num;
		unsigned int den;
		unsigned int q = i->max;
		int diff;
		if (q == 0) {
			i->empty = 1;
			return -EINVAL;
		}
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		den = div_down(num, q);
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		if (den > rats[k].den_max)
			continue;
		if (den < rats[k].den_min)
			den = rats[k].den_min;
		else {
			unsigned int r;
			r = (den - rats[k].den_min) % rats[k].den_step;
			if (r != 0)
				den += rats[k].den_step - r;
		}
		diff = q * den - num;
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		if (diff < 0)
			diff = -diff;
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		if (best_num == 0 ||
		    diff * best_den < best_diff * den) {
			best_diff = diff;
			best_den = den;
			best_num = num;
		}
	}
	if (best_den == 0) {
		i->empty = 1;
		return -EINVAL;
	}
	t.max = div_up(best_num, best_den);
	t.openmax = !!(best_num % best_den);
	t.integer = 0;
	err = snd_interval_refine(i, &t);
	if (err < 0)
		return err;

	if (snd_interval_single(i)) {
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		if (best_diff * result_den < result_diff * best_den) {
			result_num = best_num;
			result_den = best_den;
		}
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		if (nump)
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			*nump = result_num;
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		if (denp)
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			*denp = result_den;
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	}
	return err;
}

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EXPORT_SYMBOL(snd_interval_ratnum);

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/**
 * snd_interval_ratden - refine the interval value
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 * @i: interval to refine
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 * @rats_count: number of struct ratden
 * @rats: struct ratden array
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 * @nump: pointer to store the resultant numerator
 * @denp: pointer to store the resultant denominator
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 *
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 * Return: Positive if the value is changed, zero if it's not changed, or a
 * negative error code.
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 */
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static int snd_interval_ratden(struct snd_interval *i,
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			       unsigned int rats_count,
			       const struct snd_ratden *rats,
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			       unsigned int *nump, unsigned int *denp)
{
	unsigned int best_num, best_diff, best_den;
	unsigned int k;
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	struct snd_interval t;
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	int err;

	best_num = best_den = best_diff = 0;
	for (k = 0; k < rats_count; ++k) {
		unsigned int num;
		unsigned int den = rats[k].den;
		unsigned int q = i->min;
		int diff;
		num = mul(q, den);
		if (num > rats[k].num_max)
			continue;
		if (num < rats[k].num_min)
			num = rats[k].num_max;
		else {
			unsigned int r;
			r = (num - rats[k].num_min) % rats[k].num_step;
			if (r != 0)
				num += rats[k].num_step - r;
		}
		diff = num - q * den;
		if (best_num == 0 ||
		    diff * best_den < best_diff * den) {
			best_diff = diff;
			best_den = den;
			best_num = num;
		}
	}
	if (best_den == 0) {
		i->empty = 1;
		return -EINVAL;
	}
	t.min = div_down(best_num, best_den);
	t.openmin = !!(best_num % best_den);
	
	best_num = best_den = best_diff = 0;
	for (k = 0; k < rats_count; ++k) {
		unsigned int num;
		unsigned int den = rats[k].den;
		unsigned int q = i->max;
		int diff;
		num = mul(q, den);
		if (num < rats[k].num_min)
			continue;
		if (num > rats[k].num_max)
			num = rats[k].num_max;
		else {
			unsigned int r;
			r = (num - rats[k].num_min) % rats[k].num_step;
			if (r != 0)
				num -= r;
		}
		diff = q * den - num;
		if (best_num == 0 ||
		    diff * best_den < best_diff * den) {
			best_diff = diff;
			best_den = den;
			best_num = num;
		}
	}
	if (best_den == 0) {
		i->empty = 1;
		return -EINVAL;
	}
	t.max = div_up(best_num, best_den);
	t.openmax = !!(best_num % best_den);
	t.integer = 0;
	err = snd_interval_refine(i, &t);
	if (err < 0)
		return err;

	if (snd_interval_single(i)) {
		if (nump)
			*nump = best_num;
		if (denp)
			*denp = best_den;
	}
	return err;
}

/**
 * snd_interval_list - refine the interval value from the list
 * @i: the interval value to refine
 * @count: the number of elements in the list
 * @list: the value list
 * @mask: the bit-mask to evaluate
 *
 * Refines the interval value from the list.
 * When mask is non-zero, only the elements corresponding to bit 1 are
 * evaluated.
 *
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 * Return: Positive if the value is changed, zero if it's not changed, or a
 * negative error code.
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int snd_interval_list(struct snd_interval *i, unsigned int count,
		      const unsigned int *list, unsigned int mask)
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{
        unsigned int k;
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	struct snd_interval list_range;
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	if (!count) {
		i->empty = 1;
		return -EINVAL;
	}
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	snd_interval_any(&list_range);
	list_range.min = UINT_MAX;
	list_range.max = 0;
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        for (k = 0; k < count; k++) {
		if (mask && !(mask & (1 << k)))
			continue;
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		if (!snd_interval_test(i, list[k]))
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			continue;
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		list_range.min = min(list_range.min, list[k]);
		list_range.max = max(list_range.max, list[k]);
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        }
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	return snd_interval_refine(i, &list_range);
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}

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EXPORT_SYMBOL(snd_interval_list);

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/**
 * snd_interval_ranges - refine the interval value from the list of ranges
 * @i: the interval value to refine
 * @count: the number of elements in the list of ranges
 * @ranges: the ranges list
 * @mask: the bit-mask to evaluate
 *
 * Refines the interval value from the list of ranges.
 * When mask is non-zero, only the elements corresponding to bit 1 are
 * evaluated.
 *
 * Return: Positive if the value is changed, zero if it's not changed, or a
 * negative error code.
 */
int snd_interval_ranges(struct snd_interval *i, unsigned int count,
			const struct snd_interval *ranges, unsigned int mask)
{
	unsigned int k;
	struct snd_interval range_union;
	struct snd_interval range;

	if (!count) {
		snd_interval_none(i);
		return -EINVAL;
	}
	snd_interval_any(&range_union);
	range_union.min = UINT_MAX;
	range_union.max = 0;
	for (k = 0; k < count; k++) {
		if (mask && !(mask & (1 << k)))
			continue;
		snd_interval_copy(&range, &ranges[k]);
		if (snd_interval_refine(&range, i) < 0)
			continue;
		if (snd_interval_empty(&range))
			continue;

		if (range.min < range_union.min) {
			range_union.min = range.min;
			range_union.openmin = 1;
		}
		if (range.min == range_union.min && !range.openmin)
			range_union.openmin = 0;
		if (range.max > range_union.max) {
			range_union.max = range.max;
			range_union.openmax = 1;
		}
		if (range.max == range_union.max && !range.openmax)
			range_union.openmax = 0;
	}
	return snd_interval_refine(i, &range_union);
}
EXPORT_SYMBOL(snd_interval_ranges);

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{
	unsigned int n;
	int changed = 0;
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	n = i->min % step;
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	if (n != 0 || i->openmin) {
		i->min += step - n;
1111
		i->openmin = 0;
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		changed = 1;
	}
1114
	n = i->max % step;
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	if (n != 0 || i->openmax) {
		i->max -= n;
1117
		i->openmax = 0;
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		changed = 1;
	}
	if (snd_interval_checkempty(i)) {
		i->empty = 1;
		return -EINVAL;
	}
	return changed;
}

/* Info constraints helpers */

/**
 * snd_pcm_hw_rule_add - add the hw-constraint rule
 * @runtime: the pcm runtime instance
 * @cond: condition bits
 * @var: the variable to evaluate
 * @func: the evaluation function
 * @private: the private data pointer passed to function
 * @dep: the dependent variables
 *
1138
 * Return: Zero if successful, or a negative error code on failure.
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 */
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int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
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			int var,
			snd_pcm_hw_rule_func_t func, void *private,
			int dep, ...)
{
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	struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
	struct snd_pcm_hw_rule *c;
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	unsigned int k;
	va_list args;
	va_start(args, dep);
	if (constrs->rules_num >= constrs->rules_all) {
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		struct snd_pcm_hw_rule *new;
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		unsigned int new_rules = constrs->rules_all + 16;
		new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1154 1155
		if (!new) {
			va_end(args);
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			return -ENOMEM;
1157
		}
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		if (constrs->rules) {
			memcpy(new, constrs->rules,
			       constrs->rules_num * sizeof(*c));
			kfree(constrs->rules);
		}
		constrs->rules = new;
		constrs->rules_all = new_rules;
	}
	c = &constrs->rules[constrs->rules_num];
	c->cond = cond;
	c->func = func;
	c->var = var;
	c->private = private;
	k = 0;
	while (1) {
1173 1174
		if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
			va_end(args);
1175
			return -EINVAL;
1176
		}
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		c->deps[k++] = dep;
		if (dep < 0)
			break;
		dep = va_arg(args, int);
	}
	constrs->rules_num++;
	va_end(args);
	return 0;
1185
}
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EXPORT_SYMBOL(snd_pcm_hw_rule_add);

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/**
1190
 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
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 * @runtime: PCM runtime instance
 * @var: hw_params variable to apply the mask
 * @mask: the bitmap mask
 *
1195
 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1196 1197
 *
 * Return: Zero if successful, or a negative error code on failure.
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 */
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int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
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			       u_int32_t mask)
{
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	struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
	struct snd_mask *maskp = constrs_mask(constrs, var);
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	*maskp->bits &= mask;
	memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
	if (*maskp->bits == 0)
		return -EINVAL;
	return 0;
}

/**
1212
 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
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 * @runtime: PCM runtime instance
 * @var: hw_params variable to apply the mask
 * @mask: the 64bit bitmap mask
 *
1217
 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1218 1219
 *
 * Return: Zero if successful, or a negative error code on failure.
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 */
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int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
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				 u_int64_t mask)
{
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	struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
	struct snd_mask *maskp = constrs_mask(constrs, var);
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	maskp->bits[0] &= (u_int32_t)mask;
	maskp->bits[1] &= (u_int32_t)(mask >> 32);
	memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
	if (! maskp->bits[0] && ! maskp->bits[1])
		return -EINVAL;
	return 0;
}
1233
EXPORT_SYMBOL(snd_pcm_hw_constraint_mask64);
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/**
1236
 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
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 * @runtime: PCM runtime instance
 * @var: hw_params variable to apply the integer constraint
 *
 * Apply the constraint of integer to an interval parameter.
1241 1242 1243
 *
 * Return: Positive if the value is changed, zero if it's not changed, or a
 * negative error code.
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 */
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int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
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{
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	struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
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	return snd_interval_setinteger(constrs_interval(constrs, var));
}

1251 1252
EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);

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/**
1254
 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
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 * @runtime: PCM runtime instance
 * @var: hw_params variable to apply the range
 * @min: the minimal value
 * @max: the maximal value
 * 
 * Apply the min/max range constraint to an interval parameter.
1261 1262 1263
 *
 * Return: Positive if the value is changed, zero if it's not changed, or a
 * negative error code.
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 */
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int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
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				 unsigned int min, unsigned int max)
{
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	struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
	struct snd_interval t;
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	t.min = min;
	t.max = max;
	t.openmin = t.openmax = 0;
	t.integer = 0;
	return snd_interval_refine(constrs_interval(constrs, var), &t);
}

1277 1278
EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);

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static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
				struct snd_pcm_hw_rule *rule)
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{
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	struct snd_pcm_hw_constraint_list *list = rule->private;
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	return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
}		


/**
1288
 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
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 * @runtime: PCM runtime instance
 * @cond: condition bits
 * @var: hw_params variable to apply the list constraint
 * @l: list
 * 
 * Apply the list of constraints to an interval parameter.
1295 1296
 *
 * Return: Zero if successful, or a negative error code on failure.
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 */
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int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
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			       unsigned int cond,
			       snd_pcm_hw_param_t var,
1301
			       const struct snd_pcm_hw_constraint_list *l)
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{
	return snd_pcm_hw_rule_add(runtime, cond, var,
1304
				   snd_pcm_hw_rule_list, (void *)l,
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				   var, -1);
}

1308 1309
EXPORT_SYMBOL(snd_pcm_hw_constraint_list);

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static int snd_pcm_hw_rule_ranges(struct snd_pcm_hw_params *params,
				  struct snd_pcm_hw_rule *rule)
{
	struct snd_pcm_hw_constraint_ranges *r = rule->private;
	return snd_interval_ranges(hw_param_interval(params, rule->var),
				   r->count, r->ranges, r->mask);
}


/**
 * snd_pcm_hw_constraint_ranges - apply list of range constraints to a parameter
 * @runtime: PCM runtime instance
 * @cond: condition bits
 * @var: hw_params variable to apply the list of range constraints
 * @r: ranges
 *
 * Apply the list of range constraints to an interval parameter.
 *
 * Return: Zero if successful, or a negative error code on failure.
 */
int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
				 unsigned int cond,
				 snd_pcm_hw_param_t var,
				 const struct snd_pcm_hw_constraint_ranges *r)
{
	return snd_pcm_hw_rule_add(runtime, cond, var,
				   snd_pcm_hw_rule_ranges, (void *)r,
				   var, -1);
}
EXPORT_SYMBOL(snd_pcm_hw_constraint_ranges);

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static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
				   struct snd_pcm_hw_rule *rule)
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{
1344
	const struct snd_pcm_hw_constraint_ratnums *r = rule->private;
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	unsigned int num = 0, den = 0;
	int err;
	err = snd_interval_ratnum(hw_param_interval(params, rule->var),
				  r->nrats, r->rats, &num, &den);
	if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
		params->rate_num = num;
		params->rate_den = den;
	}
	return err;
}

/**
1357
 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
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 * @runtime: PCM runtime instance
 * @cond: condition bits
 * @var: hw_params variable to apply the ratnums constraint
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 * @r: struct snd_ratnums constriants
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 *
 * Return: Zero if successful, or a negative error code on failure.
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 */
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int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 
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				  unsigned int cond,
				  snd_pcm_hw_param_t var,
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				  const struct snd_pcm_hw_constraint_ratnums *r)
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{
	return snd_pcm_hw_rule_add(runtime, cond, var,
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				   snd_pcm_hw_rule_ratnums, (void *)r,
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				   var, -1);
}

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EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);

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static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
				   struct snd_pcm_hw_rule *rule)
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{
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	const struct snd_pcm_hw_constraint_ratdens *r = rule->private;
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	unsigned int num = 0, den = 0;
	int err = snd_interval_ratden(hw_param_interval(params, rule->var),
				  r->nrats, r->rats, &num, &den);
	if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
		params->rate_num = num;
		params->rate_den = den;
	}
	return err;
}

/**
1392
 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
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 * @runtime: PCM runtime instance
 * @cond: condition bits
 * @var: hw_params variable to apply the ratdens constraint
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 * @r: struct snd_ratdens constriants
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 *
 * Return: Zero if successful, or a negative error code on failure.
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 */
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int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 
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				  unsigned int cond,
				  snd_pcm_hw_param_t var,
1403
				  const struct snd_pcm_hw_constraint_ratdens *r)
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{
	return snd_pcm_hw_rule_add(runtime, cond, var,
1406
				   snd_pcm_hw_rule_ratdens, (void *)r,
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				   var, -1);
}

1410 1411
EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);

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static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
				  struct snd_pcm_hw_rule *rule)
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{
	unsigned int l = (unsigned long) rule->private;
	int width = l & 0xffff;
	unsigned int msbits = l >> 16;
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	struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1419 1420 1421 1422 1423 1424

	if (!snd_interval_single(i))
		return 0;

	if ((snd_interval_value(i) == width) ||
	    (width == 0 && snd_interval_value(i) > msbits))
1425
		params->msbits = min_not_zero(params->msbits, msbits);
1426

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	return 0;
}

/**
1431
 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
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 * @runtime: PCM runtime instance
 * @cond: condition bits
 * @width: sample bits width
 * @msbits: msbits width
1436
 *
1437 1438 1439 1440 1441
 * This constraint will set the number of most significant bits (msbits) if a
 * sample format with the specified width has been select. If width is set to 0
 * the msbits will be set for any sample format with a width larger than the
 * specified msbits.
 *
1442
 * Return: Zero if successful, or a negative error code on failure.
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 */
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int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 
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				 unsigned int cond,
				 unsigned int width,
				 unsigned int msbits)
{
	unsigned long l = (msbits << 16) | width;
	return snd_pcm_hw_rule_add(runtime, cond, -1,
				    snd_pcm_hw_rule_msbits,
				    (void*) l,
				    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
}

1456 1457
EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);

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static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
				struct snd_pcm_hw_rule *rule)
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{
	unsigned long step = (unsigned long) rule->private;
1462
	return snd_interval_step(hw_param_interval(params, rule->var), step);
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}

/**
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 * snd_pcm_hw_constraint_step - add a hw constraint step rule
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 * @runtime: PCM runtime instance
 * @cond: condition bits
 * @var: hw_params variable to apply the step constraint
 * @step: step size
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 *
 * Return: Zero if successful, or a negative error code on failure.
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 */
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int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
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			       unsigned int cond,
			       snd_pcm_hw_param_t var,
			       unsigned long step)
{
	return snd_pcm_hw_rule_add(runtime, cond, var, 
				   snd_pcm_hw_rule_step, (void *) step,
				   var, -1);
}

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EXPORT_SYMBOL(snd_pcm_hw_constraint_step);

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static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
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{
1488
	static unsigned int pow2_sizes[] = {
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		1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
		1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
		1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
		1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
	};
	return snd_interval_list(hw_param_interval(params, rule->var),
				 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
}		

/**
1499
 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
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 * @runtime: PCM runtime instance
 * @cond: condition bits
 * @var: hw_params variable to apply the power-of-2 constraint
1503 1504
 *
 * Return: Zero if successful, or a negative error code on failure.
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 */
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int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
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			       unsigned int cond,
			       snd_pcm_hw_param_t var)
{
	return snd_pcm_hw_rule_add(runtime, cond, var, 
				   snd_pcm_hw_rule_pow2, NULL,
				   var, -1);
}

1515 1516
EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);

1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530
static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
					   struct snd_pcm_hw_rule *rule)
{
	unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
	struct snd_interval *rate;

	rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	return snd_interval_list(rate, 1, &base_rate, 0);
}

/**
 * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
 * @runtime: PCM runtime instance
 * @base_rate: the rate at which the hardware does not resample
1531 1532
 *
 * Return: Zero if successful, or a negative error code on failure.
1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544
 */
int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
			       unsigned int base_rate)
{
	return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
				   SNDRV_PCM_HW_PARAM_RATE,
				   snd_pcm_hw_rule_noresample_func,
				   (void *)(uintptr_t)base_rate,
				   SNDRV_PCM_HW_PARAM_RATE, -1);
}
EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);

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static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1546
				  snd_pcm_hw_param_t var)
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{
	if (hw_is_mask(var)) {
		snd_mask_any(hw_param_mask(params, var));
		params->cmask |= 1 << var;
		params->rmask |= 1 << var;
		return;
	}
	if (hw_is_interval(var)) {
		snd_interval_any(hw_param_interval(params, var));
		params->cmask |= 1 << var;
		params->rmask |= 1 << var;
		return;
	}
	snd_BUG();
}

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void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
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{
	unsigned int k;
	memset(params, 0, sizeof(*params));
	for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
		_snd_pcm_hw_param_any(params, k);
	for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
		_snd_pcm_hw_param_any(params, k);
	params->info = ~0U;
}

1574
EXPORT_SYMBOL(_snd_pcm_hw_params_any);
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/**
1577
 * snd_pcm_hw_param_value - return @params field @var value
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 * @params: the hw_params instance
 * @var: parameter to retrieve
1580
 * @dir: pointer to the direction (-1,0,1) or %NULL
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 *
1582 1583
 * Return: The value for field @var if it's fixed in configuration space
 * defined by @params. -%EINVAL otherwise.
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 */
1585 1586
int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
			   snd_pcm_hw_param_t var, int *dir)
L
Linus Torvalds 已提交
1587 1588
{
	if (hw_is_mask(var)) {
T
Takashi Iwai 已提交
1589
		const struct snd_mask *mask = hw_param_mask_c(params, var);
L
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1590 1591 1592 1593 1594 1595 1596
		if (!snd_mask_single(mask))
			return -EINVAL;
		if (dir)
			*dir = 0;
		return snd_mask_value(mask);
	}
	if (hw_is_interval(var)) {
T
Takashi Iwai 已提交
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		const struct snd_interval *i = hw_param_interval_c(params, var);
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		if (!snd_interval_single(i))
			return -EINVAL;
		if (dir)
			*dir = i->openmin;
		return snd_interval_value(i);
	}
	return -EINVAL;
}

1607
EXPORT_SYMBOL(snd_pcm_hw_param_value);
L
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1608

T
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void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
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				snd_pcm_hw_param_t var)
{
	if (hw_is_mask(var)) {
		snd_mask_none(hw_param_mask(params, var));
		params->cmask |= 1 << var;
		params->rmask |= 1 << var;
	} else if (hw_is_interval(var)) {
		snd_interval_none(hw_param_interval(params, var));
		params->cmask |= 1 << var;
		params->rmask |= 1 << var;
	} else {
		snd_BUG();
	}
}

1625
EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
L
Linus Torvalds 已提交
1626

T
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1627
static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1628
				   snd_pcm_hw_param_t var)
L
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1629 1630 1631 1632 1633 1634
{
	int changed;
	if (hw_is_mask(var))
		changed = snd_mask_refine_first(hw_param_mask(params, var));
	else if (hw_is_interval(var))
		changed = snd_interval_refine_first(hw_param_interval(params, var));
1635
	else
L
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1636 1637 1638 1639 1640 1641 1642 1643 1644 1645
		return -EINVAL;
	if (changed) {
		params->cmask |= 1 << var;
		params->rmask |= 1 << var;
	}
	return changed;
}


/**
1646
 * snd_pcm_hw_param_first - refine config space and return minimum value
T
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 * @pcm: PCM instance
 * @params: the hw_params instance
 * @var: parameter to retrieve
1650
 * @dir: pointer to the direction (-1,0,1) or %NULL
L
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 *
1652
 * Inside configuration space defined by @params remove from @var all
L
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1653
 * values > minimum. Reduce configuration space accordingly.
1654 1655
 *
 * Return: The minimum, or a negative error code on failure.
L
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1656
 */
1657 1658 1659
int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm, 
			   struct snd_pcm_hw_params *params, 
			   snd_pcm_hw_param_t var, int *dir)
L
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{
	int changed = _snd_pcm_hw_param_first(params, var);
	if (changed < 0)
		return changed;
	if (params->rmask) {
		int err = snd_pcm_hw_refine(pcm, params);
1666 1667
		if (snd_BUG_ON(err < 0))
			return err;
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	}
	return snd_pcm_hw_param_value(params, var, dir);
}

1672 1673
EXPORT_SYMBOL(snd_pcm_hw_param_first);

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static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1675
				  snd_pcm_hw_param_t var)
L
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{
	int changed;
	if (hw_is_mask(var))
		changed = snd_mask_refine_last(hw_param_mask(params, var));
	else if (hw_is_interval(var))
		changed = snd_interval_refine_last(hw_param_interval(params, var));
1682
	else
L
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		return -EINVAL;
	if (changed) {
		params->cmask |= 1 << var;
		params->rmask |= 1 << var;
	}
	return changed;
}


/**
1693
 * snd_pcm_hw_param_last - refine config space and return maximum value
T
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1694 1695 1696
 * @pcm: PCM instance
 * @params: the hw_params instance
 * @var: parameter to retrieve
1697
 * @dir: pointer to the direction (-1,0,1) or %NULL
L
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1698
 *
1699
 * Inside configuration space defined by @params remove from @var all
L
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1700
 * values < maximum. Reduce configuration space accordingly.
1701 1702
 *
 * Return: The maximum, or a negative error code on failure.
L
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 */
1704 1705 1706
int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm, 
			  struct snd_pcm_hw_params *params,
			  snd_pcm_hw_param_t var, int *dir)
L
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{
	int changed = _snd_pcm_hw_param_last(params, var);
	if (changed < 0)
		return changed;
	if (params->rmask) {
		int err = snd_pcm_hw_refine(pcm, params);
1713 1714
		if (snd_BUG_ON(err < 0))
			return err;
L
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	}
	return snd_pcm_hw_param_value(params, var, dir);
}

1719
EXPORT_SYMBOL(snd_pcm_hw_param_last);
L
Linus Torvalds 已提交
1720 1721

/**
1722
 * snd_pcm_hw_param_choose - choose a configuration defined by @params
T
Takashi Iwai 已提交
1723 1724
 * @pcm: PCM instance
 * @params: the hw_params instance
L
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1725
 *
1726
 * Choose one configuration from configuration space defined by @params.
L
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 * The configuration chosen is that obtained fixing in this order:
 * first access, first format, first subformat, min channels,
 * min rate, min period time, max buffer size, min tick time
1730 1731
 *
 * Return: Zero if successful, or a negative error code on failure.
L
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 */
1733 1734
int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
			     struct snd_pcm_hw_params *params)
L
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1735
{
1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747
	static int vars[] = {
		SNDRV_PCM_HW_PARAM_ACCESS,
		SNDRV_PCM_HW_PARAM_FORMAT,
		SNDRV_PCM_HW_PARAM_SUBFORMAT,
		SNDRV_PCM_HW_PARAM_CHANNELS,
		SNDRV_PCM_HW_PARAM_RATE,
		SNDRV_PCM_HW_PARAM_PERIOD_TIME,
		SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
		SNDRV_PCM_HW_PARAM_TICK_TIME,
		-1
	};
	int err, *v;
L
Linus Torvalds 已提交
1748

1749 1750 1751 1752 1753
	for (v = vars; *v != -1; v++) {
		if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
			err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
		else
			err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1754 1755
		if (snd_BUG_ON(err < 0))
			return err;
1756
	}
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1757 1758 1759
	return 0;
}

T
Takashi Iwai 已提交
1760
static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
L
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1761 1762
				   void *arg)
{
T
Takashi Iwai 已提交
1763
	struct snd_pcm_runtime *runtime = substream->runtime;
L
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1764 1765 1766 1767 1768
	unsigned long flags;
	snd_pcm_stream_lock_irqsave(substream, flags);
	if (snd_pcm_running(substream) &&
	    snd_pcm_update_hw_ptr(substream) >= 0)
		runtime->status->hw_ptr %= runtime->buffer_size;
1769
	else {
L
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1770
		runtime->status->hw_ptr = 0;
1771 1772
		runtime->hw_ptr_wrap = 0;
	}
L
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1773 1774 1775 1776
	snd_pcm_stream_unlock_irqrestore(substream, flags);
	return 0;
}

T
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1777
static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
L
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1778 1779
					  void *arg)
{
T
Takashi Iwai 已提交
1780 1781
	struct snd_pcm_channel_info *info = arg;
	struct snd_pcm_runtime *runtime = substream->runtime;
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	int width;
	if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
		info->offset = -1;
		return 0;
	}
	width = snd_pcm_format_physical_width(runtime->format);
	if (width < 0)
		return width;
	info->offset = 0;
	switch (runtime->access) {
	case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
	case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
		info->first = info->channel * width;
		info->step = runtime->channels * width;
		break;
	case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
	case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
	{
		size_t size = runtime->dma_bytes / runtime->channels;
		info->first = info->channel * size * 8;
		info->step = width;
		break;
	}
	default:
		snd_BUG();
		break;
	}
	return 0;
}

1812 1813 1814 1815 1816
static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
				       void *arg)
{
	struct snd_pcm_hw_params *params = arg;
	snd_pcm_format_t format;
1817 1818
	int channels;
	ssize_t frame_size;
1819 1820 1821 1822 1823

	params->fifo_size = substream->runtime->hw.fifo_size;
	if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
		format = params_format(params);
		channels = params_channels(params);
1824 1825 1826
		frame_size = snd_pcm_format_size(format, channels);
		if (frame_size > 0)
			params->fifo_size /= (unsigned)frame_size;
1827 1828 1829 1830
	}
	return 0;
}

L
Linus Torvalds 已提交
1831 1832 1833 1834 1835 1836 1837 1838 1839
/**
 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
 * @substream: the pcm substream instance
 * @cmd: ioctl command
 * @arg: ioctl argument
 *
 * Processes the generic ioctl commands for PCM.
 * Can be passed as the ioctl callback for PCM ops.
 *
1840
 * Return: Zero if successful, or a negative error code on failure.
L
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1841
 */
T
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1842
int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
L
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1843 1844 1845 1846 1847 1848 1849 1850 1851
		      unsigned int cmd, void *arg)
{
	switch (cmd) {
	case SNDRV_PCM_IOCTL1_INFO:
		return 0;
	case SNDRV_PCM_IOCTL1_RESET:
		return snd_pcm_lib_ioctl_reset(substream, arg);
	case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
		return snd_pcm_lib_ioctl_channel_info(substream, arg);
1852 1853
	case SNDRV_PCM_IOCTL1_FIFO_SIZE:
		return snd_pcm_lib_ioctl_fifo_size(substream, arg);
L
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1854 1855 1856 1857
	}
	return -ENXIO;
}

1858 1859
EXPORT_SYMBOL(snd_pcm_lib_ioctl);

L
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1860 1861 1862 1863 1864 1865
/**
 * snd_pcm_period_elapsed - update the pcm status for the next period
 * @substream: the pcm substream instance
 *
 * This function is called from the interrupt handler when the
 * PCM has processed the period size.  It will update the current
1866
 * pointer, wake up sleepers, etc.
L
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 *
 * Even if more than one periods have elapsed since the last call, you
 * have to call this only once.
 */
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void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
L
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1872
{
T
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1873
	struct snd_pcm_runtime *runtime;
L
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1874 1875
	unsigned long flags;

1876 1877
	if (PCM_RUNTIME_CHECK(substream))
		return;
L
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1878 1879 1880 1881
	runtime = substream->runtime;

	snd_pcm_stream_lock_irqsave(substream, flags);
	if (!snd_pcm_running(substream) ||
1882
	    snd_pcm_update_hw_ptr0(substream, 1) < 0)
L
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1883 1884
		goto _end;

1885
#ifdef CONFIG_SND_PCM_TIMER
L
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1886 1887
	if (substream->timer_running)
		snd_timer_interrupt(substream->timer, 1);
1888
#endif
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1889 1890
 _end:
	kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1891
	snd_pcm_stream_unlock_irqrestore(substream, flags);
L
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1892 1893
}

1894 1895
EXPORT_SYMBOL(snd_pcm_period_elapsed);

1896 1897 1898 1899 1900 1901
/*
 * Wait until avail_min data becomes available
 * Returns a negative error code if any error occurs during operation.
 * The available space is stored on availp.  When err = 0 and avail = 0
 * on the capture stream, it indicates the stream is in DRAINING state.
 */
1902
static int wait_for_avail(struct snd_pcm_substream *substream,
1903 1904 1905 1906 1907 1908 1909
			      snd_pcm_uframes_t *availp)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
	wait_queue_t wait;
	int err = 0;
	snd_pcm_uframes_t avail = 0;
1910 1911
	long wait_time, tout;

1912 1913 1914 1915
	init_waitqueue_entry(&wait, current);
	set_current_state(TASK_INTERRUPTIBLE);
	add_wait_queue(&runtime->tsleep, &wait);

1916 1917 1918 1919 1920 1921 1922 1923 1924 1925
	if (runtime->no_period_wakeup)
		wait_time = MAX_SCHEDULE_TIMEOUT;
	else {
		wait_time = 10;
		if (runtime->rate) {
			long t = runtime->period_size * 2 / runtime->rate;
			wait_time = max(t, wait_time);
		}
		wait_time = msecs_to_jiffies(wait_time * 1000);
	}
1926

1927 1928 1929 1930 1931
	for (;;) {
		if (signal_pending(current)) {
			err = -ERESTARTSYS;
			break;
		}
1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945

		/*
		 * We need to check if space became available already
		 * (and thus the wakeup happened already) first to close
		 * the race of space already having become available.
		 * This check must happen after been added to the waitqueue
		 * and having current state be INTERRUPTIBLE.
		 */
		if (is_playback)
			avail = snd_pcm_playback_avail(runtime);
		else
			avail = snd_pcm_capture_avail(runtime);
		if (avail >= runtime->twake)
			break;
1946
		snd_pcm_stream_unlock_irq(substream);
1947 1948 1949

		tout = schedule_timeout(wait_time);

1950
		snd_pcm_stream_lock_irq(substream);
1951
		set_current_state(TASK_INTERRUPTIBLE);
1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969
		switch (runtime->status->state) {
		case SNDRV_PCM_STATE_SUSPENDED:
			err = -ESTRPIPE;
			goto _endloop;
		case SNDRV_PCM_STATE_XRUN:
			err = -EPIPE;
			goto _endloop;
		case SNDRV_PCM_STATE_DRAINING:
			if (is_playback)
				err = -EPIPE;
			else 
				avail = 0; /* indicate draining */
			goto _endloop;
		case SNDRV_PCM_STATE_OPEN:
		case SNDRV_PCM_STATE_SETUP:
		case SNDRV_PCM_STATE_DISCONNECTED:
			err = -EBADFD;
			goto _endloop;
1970 1971
		case SNDRV_PCM_STATE_PAUSED:
			continue;
1972 1973
		}
		if (!tout) {
1974 1975 1976
			pcm_dbg(substream->pcm,
				"%s write error (DMA or IRQ trouble?)\n",
				is_playback ? "playback" : "capture");
1977 1978 1979 1980 1981
			err = -EIO;
			break;
		}
	}
 _endloop:
1982
	set_current_state(TASK_RUNNING);
1983
	remove_wait_queue(&runtime->tsleep, &wait);
1984 1985 1986 1987
	*availp = avail;
	return err;
}
	
T
Takashi Iwai 已提交
1988
static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
L
Linus Torvalds 已提交
1989 1990 1991 1992
				      unsigned int hwoff,
				      unsigned long data, unsigned int off,
				      snd_pcm_uframes_t frames)
{
T
Takashi Iwai 已提交
1993
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006
	int err;
	char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
	if (substream->ops->copy) {
		if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
			return err;
	} else {
		char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
		if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
			return -EFAULT;
	}
	return 0;
}
 
T
Takashi Iwai 已提交
2007
typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
L
Linus Torvalds 已提交
2008 2009 2010
			  unsigned long data, unsigned int off,
			  snd_pcm_uframes_t size);

T
Takashi Iwai 已提交
2011
static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream, 
L
Linus Torvalds 已提交
2012 2013 2014 2015 2016
					    unsigned long data,
					    snd_pcm_uframes_t size,
					    int nonblock,
					    transfer_f transfer)
{
T
Takashi Iwai 已提交
2017
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
2018 2019
	snd_pcm_uframes_t xfer = 0;
	snd_pcm_uframes_t offset = 0;
2020
	snd_pcm_uframes_t avail;
L
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2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042
	int err = 0;

	if (size == 0)
		return 0;

	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_RUNNING:
	case SNDRV_PCM_STATE_PAUSED:
		break;
	case SNDRV_PCM_STATE_XRUN:
		err = -EPIPE;
		goto _end_unlock;
	case SNDRV_PCM_STATE_SUSPENDED:
		err = -ESTRPIPE;
		goto _end_unlock;
	default:
		err = -EBADFD;
		goto _end_unlock;
	}

2043
	runtime->twake = runtime->control->avail_min ? : 1;
2044 2045 2046
	if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
		snd_pcm_update_hw_ptr(substream);
	avail = snd_pcm_playback_avail(runtime);
L
Linus Torvalds 已提交
2047 2048 2049
	while (size > 0) {
		snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
		snd_pcm_uframes_t cont;
2050
		if (!avail) {
L
Linus Torvalds 已提交
2051 2052 2053 2054
			if (nonblock) {
				err = -EAGAIN;
				goto _end_unlock;
			}
2055 2056 2057
			runtime->twake = min_t(snd_pcm_uframes_t, size,
					runtime->control->avail_min ? : 1);
			err = wait_for_avail(substream, &avail);
2058
			if (err < 0)
2059
				goto _end_unlock;
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2060 2061 2062 2063 2064
		}
		frames = size > avail ? avail : size;
		cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
		if (frames > cont)
			frames = cont;
2065
		if (snd_BUG_ON(!frames)) {
2066
			runtime->twake = 0;
2067 2068 2069
			snd_pcm_stream_unlock_irq(substream);
			return -EINVAL;
		}
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2070 2071 2072
		appl_ptr = runtime->control->appl_ptr;
		appl_ofs = appl_ptr % runtime->buffer_size;
		snd_pcm_stream_unlock_irq(substream);
2073
		err = transfer(substream, appl_ofs, data, offset, frames);
L
Linus Torvalds 已提交
2074
		snd_pcm_stream_lock_irq(substream);
2075 2076
		if (err < 0)
			goto _end_unlock;
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2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096
		switch (runtime->status->state) {
		case SNDRV_PCM_STATE_XRUN:
			err = -EPIPE;
			goto _end_unlock;
		case SNDRV_PCM_STATE_SUSPENDED:
			err = -ESTRPIPE;
			goto _end_unlock;
		default:
			break;
		}
		appl_ptr += frames;
		if (appl_ptr >= runtime->boundary)
			appl_ptr -= runtime->boundary;
		runtime->control->appl_ptr = appl_ptr;
		if (substream->ops->ack)
			substream->ops->ack(substream);

		offset += frames;
		size -= frames;
		xfer += frames;
2097
		avail -= frames;
L
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2098 2099 2100 2101 2102 2103 2104 2105
		if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
		    snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
			err = snd_pcm_start(substream);
			if (err < 0)
				goto _end_unlock;
		}
	}
 _end_unlock:
2106
	runtime->twake = 0;
2107 2108
	if (xfer > 0 && err >= 0)
		snd_pcm_update_state(substream, runtime);
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2109 2110 2111 2112
	snd_pcm_stream_unlock_irq(substream);
	return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
}

2113 2114
/* sanity-check for read/write methods */
static int pcm_sanity_check(struct snd_pcm_substream *substream)
L
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2115
{
T
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	struct snd_pcm_runtime *runtime;
2117 2118
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
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	runtime = substream->runtime;
2120 2121
	if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
		return -EINVAL;
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2122 2123
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
2124 2125 2126 2127 2128 2129 2130 2131
	return 0;
}

snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
{
	struct snd_pcm_runtime *runtime;
	int nonblock;
	int err;
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2132

2133 2134 2135 2136
	err = pcm_sanity_check(substream);
	if (err < 0)
		return err;
	runtime = substream->runtime;
2137
	nonblock = !!(substream->f_flags & O_NONBLOCK);
L
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2138 2139 2140 2141 2142 2143 2144 2145

	if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
	    runtime->channels > 1)
		return -EINVAL;
	return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
				  snd_pcm_lib_write_transfer);
}

2146 2147
EXPORT_SYMBOL(snd_pcm_lib_write);

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static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
L
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2149 2150 2151 2152
				       unsigned int hwoff,
				       unsigned long data, unsigned int off,
				       snd_pcm_uframes_t frames)
{
T
Takashi Iwai 已提交
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	struct snd_pcm_runtime *runtime = substream->runtime;
L
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2154 2155 2156 2157 2158
	int err;
	void __user **bufs = (void __user **)data;
	int channels = runtime->channels;
	int c;
	if (substream->ops->copy) {
2159 2160
		if (snd_BUG_ON(!substream->ops->silence))
			return -EINVAL;
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2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187
		for (c = 0; c < channels; ++c, ++bufs) {
			if (*bufs == NULL) {
				if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
					return err;
			} else {
				char __user *buf = *bufs + samples_to_bytes(runtime, off);
				if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
					return err;
			}
		}
	} else {
		/* default transfer behaviour */
		size_t dma_csize = runtime->dma_bytes / channels;
		for (c = 0; c < channels; ++c, ++bufs) {
			char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
			if (*bufs == NULL) {
				snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
			} else {
				char __user *buf = *bufs + samples_to_bytes(runtime, off);
				if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
					return -EFAULT;
			}
		}
	}
	return 0;
}
 
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snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
L
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2189 2190 2191
				     void __user **bufs,
				     snd_pcm_uframes_t frames)
{
T
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2192
	struct snd_pcm_runtime *runtime;
L
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2193
	int nonblock;
2194
	int err;
L
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2195

2196 2197 2198
	err = pcm_sanity_check(substream);
	if (err < 0)
		return err;
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2199
	runtime = substream->runtime;
2200
	nonblock = !!(substream->f_flags & O_NONBLOCK);
L
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2201 2202 2203 2204 2205 2206 2207

	if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
		return -EINVAL;
	return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
				  nonblock, snd_pcm_lib_writev_transfer);
}

2208 2209
EXPORT_SYMBOL(snd_pcm_lib_writev);

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static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream, 
L
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2211 2212 2213 2214
				     unsigned int hwoff,
				     unsigned long data, unsigned int off,
				     snd_pcm_uframes_t frames)
{
T
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2215
	struct snd_pcm_runtime *runtime = substream->runtime;
L
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2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228
	int err;
	char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
	if (substream->ops->copy) {
		if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
			return err;
	} else {
		char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
		if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
			return -EFAULT;
	}
	return 0;
}

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static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
L
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2230 2231 2232 2233 2234
					   unsigned long data,
					   snd_pcm_uframes_t size,
					   int nonblock,
					   transfer_f transfer)
{
T
Takashi Iwai 已提交
2235
	struct snd_pcm_runtime *runtime = substream->runtime;
L
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2236 2237
	snd_pcm_uframes_t xfer = 0;
	snd_pcm_uframes_t offset = 0;
2238
	snd_pcm_uframes_t avail;
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	int err = 0;

	if (size == 0)
		return 0;

	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_PREPARED:
		if (size >= runtime->start_threshold) {
			err = snd_pcm_start(substream);
			if (err < 0)
				goto _end_unlock;
		}
		break;
	case SNDRV_PCM_STATE_DRAINING:
	case SNDRV_PCM_STATE_RUNNING:
	case SNDRV_PCM_STATE_PAUSED:
		break;
	case SNDRV_PCM_STATE_XRUN:
		err = -EPIPE;
		goto _end_unlock;
	case SNDRV_PCM_STATE_SUSPENDED:
		err = -ESTRPIPE;
		goto _end_unlock;
	default:
		err = -EBADFD;
		goto _end_unlock;
	}

2268
	runtime->twake = runtime->control->avail_min ? : 1;
2269 2270 2271
	if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
		snd_pcm_update_hw_ptr(substream);
	avail = snd_pcm_capture_avail(runtime);
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	while (size > 0) {
		snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
		snd_pcm_uframes_t cont;
2275 2276 2277 2278
		if (!avail) {
			if (runtime->status->state ==
			    SNDRV_PCM_STATE_DRAINING) {
				snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
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				goto _end_unlock;
			}
			if (nonblock) {
				err = -EAGAIN;
				goto _end_unlock;
			}
2285 2286 2287
			runtime->twake = min_t(snd_pcm_uframes_t, size,
					runtime->control->avail_min ? : 1);
			err = wait_for_avail(substream, &avail);
2288
			if (err < 0)
2289
				goto _end_unlock;
2290 2291
			if (!avail)
				continue; /* draining */
L
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		}
		frames = size > avail ? avail : size;
		cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
		if (frames > cont)
			frames = cont;
2297
		if (snd_BUG_ON(!frames)) {
2298
			runtime->twake = 0;
2299 2300 2301
			snd_pcm_stream_unlock_irq(substream);
			return -EINVAL;
		}
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		appl_ptr = runtime->control->appl_ptr;
		appl_ofs = appl_ptr % runtime->buffer_size;
		snd_pcm_stream_unlock_irq(substream);
2305
		err = transfer(substream, appl_ofs, data, offset, frames);
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		snd_pcm_stream_lock_irq(substream);
2307 2308
		if (err < 0)
			goto _end_unlock;
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		switch (runtime->status->state) {
		case SNDRV_PCM_STATE_XRUN:
			err = -EPIPE;
			goto _end_unlock;
		case SNDRV_PCM_STATE_SUSPENDED:
			err = -ESTRPIPE;
			goto _end_unlock;
		default:
			break;
		}
		appl_ptr += frames;
		if (appl_ptr >= runtime->boundary)
			appl_ptr -= runtime->boundary;
		runtime->control->appl_ptr = appl_ptr;
		if (substream->ops->ack)
			substream->ops->ack(substream);

		offset += frames;
		size -= frames;
		xfer += frames;
2329
		avail -= frames;
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	}
 _end_unlock:
2332
	runtime->twake = 0;
2333 2334
	if (xfer > 0 && err >= 0)
		snd_pcm_update_state(substream, runtime);
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	snd_pcm_stream_unlock_irq(substream);
	return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
}

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snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
L
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2340
{
T
Takashi Iwai 已提交
2341
	struct snd_pcm_runtime *runtime;
L
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2342
	int nonblock;
2343
	int err;
L
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2344
	
2345 2346 2347
	err = pcm_sanity_check(substream);
	if (err < 0)
		return err;
L
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2348
	runtime = substream->runtime;
2349
	nonblock = !!(substream->f_flags & O_NONBLOCK);
L
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2350 2351 2352 2353 2354
	if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
		return -EINVAL;
	return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
}

2355 2356
EXPORT_SYMBOL(snd_pcm_lib_read);

T
Takashi Iwai 已提交
2357
static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
L
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2358 2359 2360 2361
				      unsigned int hwoff,
				      unsigned long data, unsigned int off,
				      snd_pcm_uframes_t frames)
{
T
Takashi Iwai 已提交
2362
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
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	int err;
	void __user **bufs = (void __user **)data;
	int channels = runtime->channels;
	int c;
	if (substream->ops->copy) {
		for (c = 0; c < channels; ++c, ++bufs) {
			char __user *buf;
			if (*bufs == NULL)
				continue;
			buf = *bufs + samples_to_bytes(runtime, off);
			if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
				return err;
		}
	} else {
		snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
		for (c = 0; c < channels; ++c, ++bufs) {
			char *hwbuf;
			char __user *buf;
			if (*bufs == NULL)
				continue;

			hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
			buf = *bufs + samples_to_bytes(runtime, off);
			if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
				return -EFAULT;
		}
	}
	return 0;
}
 
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2393
snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
L
Linus Torvalds 已提交
2394 2395 2396
				    void __user **bufs,
				    snd_pcm_uframes_t frames)
{
T
Takashi Iwai 已提交
2397
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
2398
	int nonblock;
2399
	int err;
L
Linus Torvalds 已提交
2400

2401 2402 2403
	err = pcm_sanity_check(substream);
	if (err < 0)
		return err;
L
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2404 2405 2406 2407
	runtime = substream->runtime;
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;

2408
	nonblock = !!(substream->f_flags & O_NONBLOCK);
L
Linus Torvalds 已提交
2409 2410 2411 2412 2413 2414
	if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
		return -EINVAL;
	return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
}

EXPORT_SYMBOL(snd_pcm_lib_readv);
2415 2416 2417 2418 2419 2420 2421 2422

/*
 * standard channel mapping helpers
 */

/* default channel maps for multi-channel playbacks, up to 8 channels */
const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = {
	{ .channels = 1,
2423
	  .map = { SNDRV_CHMAP_MONO } },
2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444
	{ .channels = 2,
	  .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
	{ .channels = 4,
	  .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
		   SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
	{ .channels = 6,
	  .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
		   SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
		   SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
	{ .channels = 8,
	  .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
		   SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
		   SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
		   SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
	{ }
};
EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps);

/* alternative channel maps with CLFE <-> surround swapped for 6/8 channels */
const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = {
	{ .channels = 1,
2445
	  .map = { SNDRV_CHMAP_MONO } },
2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494
	{ .channels = 2,
	  .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
	{ .channels = 4,
	  .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
		   SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
	{ .channels = 6,
	  .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
		   SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
		   SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
	{ .channels = 8,
	  .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
		   SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
		   SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
		   SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
	{ }
};
EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps);

static bool valid_chmap_channels(const struct snd_pcm_chmap *info, int ch)
{
	if (ch > info->max_channels)
		return false;
	return !info->channel_mask || (info->channel_mask & (1U << ch));
}

static int pcm_chmap_ctl_info(struct snd_kcontrol *kcontrol,
			      struct snd_ctl_elem_info *uinfo)
{
	struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);

	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 0;
	uinfo->count = info->max_channels;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = SNDRV_CHMAP_LAST;
	return 0;
}

/* get callback for channel map ctl element
 * stores the channel position firstly matching with the current channels
 */
static int pcm_chmap_ctl_get(struct snd_kcontrol *kcontrol,
			     struct snd_ctl_elem_value *ucontrol)
{
	struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
	unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
	struct snd_pcm_substream *substream;
	const struct snd_pcm_chmap_elem *map;

2495
	if (!info->chmap)
2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526
		return -EINVAL;
	substream = snd_pcm_chmap_substream(info, idx);
	if (!substream)
		return -ENODEV;
	memset(ucontrol->value.integer.value, 0,
	       sizeof(ucontrol->value.integer.value));
	if (!substream->runtime)
		return 0; /* no channels set */
	for (map = info->chmap; map->channels; map++) {
		int i;
		if (map->channels == substream->runtime->channels &&
		    valid_chmap_channels(info, map->channels)) {
			for (i = 0; i < map->channels; i++)
				ucontrol->value.integer.value[i] = map->map[i];
			return 0;
		}
	}
	return -EINVAL;
}

/* tlv callback for channel map ctl element
 * expands the pre-defined channel maps in a form of TLV
 */
static int pcm_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
			     unsigned int size, unsigned int __user *tlv)
{
	struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
	const struct snd_pcm_chmap_elem *map;
	unsigned int __user *dst;
	int c, count = 0;

2527
	if (!info->chmap)
2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578
		return -EINVAL;
	if (size < 8)
		return -ENOMEM;
	if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
		return -EFAULT;
	size -= 8;
	dst = tlv + 2;
	for (map = info->chmap; map->channels; map++) {
		int chs_bytes = map->channels * 4;
		if (!valid_chmap_channels(info, map->channels))
			continue;
		if (size < 8)
			return -ENOMEM;
		if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
		    put_user(chs_bytes, dst + 1))
			return -EFAULT;
		dst += 2;
		size -= 8;
		count += 8;
		if (size < chs_bytes)
			return -ENOMEM;
		size -= chs_bytes;
		count += chs_bytes;
		for (c = 0; c < map->channels; c++) {
			if (put_user(map->map[c], dst))
				return -EFAULT;
			dst++;
		}
	}
	if (put_user(count, tlv + 1))
		return -EFAULT;
	return 0;
}

static void pcm_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
{
	struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
	info->pcm->streams[info->stream].chmap_kctl = NULL;
	kfree(info);
}

/**
 * snd_pcm_add_chmap_ctls - create channel-mapping control elements
 * @pcm: the assigned PCM instance
 * @stream: stream direction
 * @chmap: channel map elements (for query)
 * @max_channels: the max number of channels for the stream
 * @private_value: the value passed to each kcontrol's private_value field
 * @info_ret: store struct snd_pcm_chmap instance if non-NULL
 *
 * Create channel-mapping control elements assigned to the given PCM stream(s).
2579
 * Return: Zero if successful, or a negative error value.
2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598
 */
int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
			   const struct snd_pcm_chmap_elem *chmap,
			   int max_channels,
			   unsigned long private_value,
			   struct snd_pcm_chmap **info_ret)
{
	struct snd_pcm_chmap *info;
	struct snd_kcontrol_new knew = {
		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
		.access = SNDRV_CTL_ELEM_ACCESS_READ |
			SNDRV_CTL_ELEM_ACCESS_TLV_READ |
			SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
		.info = pcm_chmap_ctl_info,
		.get = pcm_chmap_ctl_get,
		.tlv.c = pcm_chmap_ctl_tlv,
	};
	int err;

2599 2600
	if (WARN_ON(pcm->streams[stream].chmap_kctl))
		return -EBUSY;
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	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;
	info->pcm = pcm;
	info->stream = stream;
	info->chmap = chmap;
	info->max_channels = max_channels;
	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
		knew.name = "Playback Channel Map";
	else
		knew.name = "Capture Channel Map";
	knew.device = pcm->device;
	knew.count = pcm->streams[stream].substream_count;
	knew.private_value = private_value;
	info->kctl = snd_ctl_new1(&knew, info);
	if (!info->kctl) {
		kfree(info);
		return -ENOMEM;
	}
	info->kctl->private_free = pcm_chmap_ctl_private_free;
	err = snd_ctl_add(pcm->card, info->kctl);
	if (err < 0)
		return err;
	pcm->streams[stream].chmap_kctl = info->kctl;
	if (info_ret)
		*info_ret = info;
	return 0;
}
EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls);