Release 4.7 sound/soc/soc-pcm.c

/*
 * soc-pcm.c  --  ALSA SoC PCM
 *
 * Copyright 2005 Wolfson Microelectronics PLC.
 * Copyright 2005 Openedhand Ltd.
 * Copyright (C) 2010 Slimlogic Ltd.
 * Copyright (C) 2010 Texas Instruments Inc.
 *
 * Authors: Liam Girdwood <lrg@ti.com>
 *          Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 *  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.
 *
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/export.h>
#include <linux/debugfs.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dpcm.h>
#include <sound/initval.h>


#define DPCM_MAX_BE_USERS	8

/*
 * snd_soc_dai_stream_valid() - check if a DAI supports the given stream
 *
 * Returns true if the DAI supports the indicated stream type.
 */


static bool snd_soc_dai_stream_valid(struct snd_soc_dai *dai, int stream)
{
	struct snd_soc_pcm_stream *codec_stream;

	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
		codec_stream = &dai->driver->playback;
	else
		codec_stream = &dai->driver->capture;

	/* If the codec specifies any rate at all, it supports the stream. */
	return codec_stream->rates;
}

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/**
 * snd_soc_runtime_activate() - Increment active count for PCM runtime components
 * @rtd: ASoC PCM runtime that is activated
 * @stream: Direction of the PCM stream
 *
 * Increments the active count for all the DAIs and components attached to a PCM
 * runtime. Should typically be called when a stream is opened.
 *
 * Must be called with the rtd->pcm_mutex being held
 */


void snd_soc_runtime_activate(struct snd_soc_pcm_runtime *rtd, int stream)
{
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	int i;

	lockdep_assert_held(&rtd->pcm_mutex);

	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
		cpu_dai->playback_active++;
		for (i = 0; i < rtd->num_codecs; i++)
			rtd->codec_dais[i]->playback_active++;
	} else {
		cpu_dai->capture_active++;
		for (i = 0; i < rtd->num_codecs; i++)
			rtd->codec_dais[i]->capture_active++;
	}

	cpu_dai->active++;
	cpu_dai->component->active++;
	for (i = 0; i < rtd->num_codecs; i++) {
		rtd->codec_dais[i]->active++;
		rtd->codec_dais[i]->component->active++;
	}
}

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/**
 * snd_soc_runtime_deactivate() - Decrement active count for PCM runtime components
 * @rtd: ASoC PCM runtime that is deactivated
 * @stream: Direction of the PCM stream
 *
 * Decrements the active count for all the DAIs and components attached to a PCM
 * runtime. Should typically be called when a stream is closed.
 *
 * Must be called with the rtd->pcm_mutex being held
 */


void snd_soc_runtime_deactivate(struct snd_soc_pcm_runtime *rtd, int stream)
{
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	int i;

	lockdep_assert_held(&rtd->pcm_mutex);

	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
		cpu_dai->playback_active--;
		for (i = 0; i < rtd->num_codecs; i++)
			rtd->codec_dais[i]->playback_active--;
	} else {
		cpu_dai->capture_active--;
		for (i = 0; i < rtd->num_codecs; i++)
			rtd->codec_dais[i]->capture_active--;
	}

	cpu_dai->active--;
	cpu_dai->component->active--;
	for (i = 0; i < rtd->num_codecs; i++) {
		rtd->codec_dais[i]->component->active--;
		rtd->codec_dais[i]->active--;
	}
}

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/**
 * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
 * @rtd: The ASoC PCM runtime that should be checked.
 *
 * This function checks whether the power down delay should be ignored for a
 * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
 * been configured to ignore the delay, or if none of the components benefits
 * from having the delay.
 */


bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
{
	int i;
	bool ignore = true;

	if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
		return true;

	for (i = 0; i < rtd->num_codecs; i++)
		ignore &= rtd->codec_dais[i]->component->ignore_pmdown_time;

	return rtd->cpu_dai->component->ignore_pmdown_time && ignore;
}

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/**
 * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
 * @substream: the pcm substream
 * @hw: the hardware parameters
 *
 * Sets the substream runtime hardware parameters.
 */


int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
	const struct snd_pcm_hardware *hw)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	runtime->hw.info = hw->info;
	runtime->hw.formats = hw->formats;
	runtime->hw.period_bytes_min = hw->period_bytes_min;
	runtime->hw.period_bytes_max = hw->period_bytes_max;
	runtime->hw.periods_min = hw->periods_min;
	runtime->hw.periods_max = hw->periods_max;
	runtime->hw.buffer_bytes_max = hw->buffer_bytes_max;
	runtime->hw.fifo_size = hw->fifo_size;
	return 0;
}
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EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);

/* DPCM stream event, send event to FE and all active BEs. */


int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
	int event)
{
	struct snd_soc_dpcm *dpcm;

	list_for_each_entry(dpcm, &fe->dpcm[dir].be_clients, list_be) {

		struct snd_soc_pcm_runtime *be = dpcm->be;

		dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
				be->dai_link->name, event, dir);

		snd_soc_dapm_stream_event(be, dir, event);
	}

	snd_soc_dapm_stream_event(fe, dir, event);

	return 0;
}

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static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
					struct snd_soc_dai *soc_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	int ret;

	if (soc_dai->rate && (soc_dai->driver->symmetric_rates ||
				rtd->dai_link->symmetric_rates)) {
		dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %dHz rate\n",
				soc_dai->rate);

		ret = snd_pcm_hw_constraint_single(substream->runtime,
						SNDRV_PCM_HW_PARAM_RATE,
						soc_dai->rate);
		if (ret < 0) {
			dev_err(soc_dai->dev,
				"ASoC: Unable to apply rate constraint: %d\n",
				ret);
			return ret;
		}
	}

	if (soc_dai->channels && (soc_dai->driver->symmetric_channels ||
				rtd->dai_link->symmetric_channels)) {
		dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d channel(s)\n",
				soc_dai->channels);

		ret = snd_pcm_hw_constraint_single(substream->runtime,
						SNDRV_PCM_HW_PARAM_CHANNELS,
						soc_dai->channels);
		if (ret < 0) {
			dev_err(soc_dai->dev,
				"ASoC: Unable to apply channel symmetry constraint: %d\n",
				ret);
			return ret;
		}
	}

	if (soc_dai->sample_bits && (soc_dai->driver->symmetric_samplebits ||
				rtd->dai_link->symmetric_samplebits)) {
		dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %d sample bits\n",
				soc_dai->sample_bits);

		ret = snd_pcm_hw_constraint_single(substream->runtime,
						SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
						soc_dai->sample_bits);
		if (ret < 0) {
			dev_err(soc_dai->dev,
				"ASoC: Unable to apply sample bits symmetry constraint: %d\n",
				ret);
			return ret;
		}
	}

	return 0;
}

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static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	unsigned int rate, channels, sample_bits, symmetry, i;

	rate = params_rate(params);
	channels = params_channels(params);
	sample_bits = snd_pcm_format_physical_width(params_format(params));

	/* reject unmatched parameters when applying symmetry */
	symmetry = cpu_dai->driver->symmetric_rates ||
		rtd->dai_link->symmetric_rates;

	for (i = 0; i < rtd->num_codecs; i++)
		symmetry |= rtd->codec_dais[i]->driver->symmetric_rates;

	if (symmetry && cpu_dai->rate && cpu_dai->rate != rate) {
		dev_err(rtd->dev, "ASoC: unmatched rate symmetry: %d - %d\n",
				cpu_dai->rate, rate);
		return -EINVAL;
	}

	symmetry = cpu_dai->driver->symmetric_channels ||
		rtd->dai_link->symmetric_channels;

	for (i = 0; i < rtd->num_codecs; i++)
		symmetry |= rtd->codec_dais[i]->driver->symmetric_channels;

	if (symmetry && cpu_dai->channels && cpu_dai->channels != channels) {
		dev_err(rtd->dev, "ASoC: unmatched channel symmetry: %d - %d\n",
				cpu_dai->channels, channels);
		return -EINVAL;
	}

	symmetry = cpu_dai->driver->symmetric_samplebits ||
		rtd->dai_link->symmetric_samplebits;

	for (i = 0; i < rtd->num_codecs; i++)
		symmetry |= rtd->codec_dais[i]->driver->symmetric_samplebits;

	if (symmetry && cpu_dai->sample_bits && cpu_dai->sample_bits != sample_bits) {
		dev_err(rtd->dev, "ASoC: unmatched sample bits symmetry: %d - %d\n",
				cpu_dai->sample_bits, sample_bits);
		return -EINVAL;
	}

	return 0;
}

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static bool soc_pcm_has_symmetry(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai_driver *cpu_driver = rtd->cpu_dai->driver;
	struct snd_soc_dai_link *link = rtd->dai_link;
	unsigned int symmetry, i;

	symmetry = cpu_driver->symmetric_rates || link->symmetric_rates ||
		cpu_driver->symmetric_channels || link->symmetric_channels ||
		cpu_driver->symmetric_samplebits || link->symmetric_samplebits;

	for (i = 0; i < rtd->num_codecs; i++)
		symmetry = symmetry ||
			rtd->codec_dais[i]->driver->symmetric_rates ||
			rtd->codec_dais[i]->driver->symmetric_channels ||
			rtd->codec_dais[i]->driver->symmetric_samplebits;

	return symmetry;
}

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static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	int ret;

	if (!bits)
		return;

	ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
	if (ret != 0)
		dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
				 bits, ret);
}

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static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct snd_soc_dai *codec_dai;
	int i;
	unsigned int bits = 0, cpu_bits;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		for (i = 0; i < rtd->num_codecs; i++) {
			codec_dai = rtd->codec_dais[i];
			if (codec_dai->driver->playback.sig_bits == 0) {
				bits = 0;
				break;
			}
			bits = max(codec_dai->driver->playback.sig_bits, bits);
		}
		cpu_bits = cpu_dai->driver->playback.sig_bits;
	} else {
		for (i = 0; i < rtd->num_codecs; i++) {
			codec_dai = rtd->codec_dais[i];
			if (codec_dai->driver->capture.sig_bits == 0) {
				bits = 0;
				break;
			}
			bits = max(codec_dai->driver->capture.sig_bits, bits);
		}
		cpu_bits = cpu_dai->driver->capture.sig_bits;
	}

	soc_pcm_set_msb(substream, bits);
	soc_pcm_set_msb(substream, cpu_bits);
}

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static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_pcm_hardware *hw = &runtime->hw;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai_driver *cpu_dai_drv = rtd->cpu_dai->driver;
	struct snd_soc_dai_driver *codec_dai_drv;
	struct snd_soc_pcm_stream *codec_stream;
	struct snd_soc_pcm_stream *cpu_stream;
	unsigned int chan_min = 0, chan_max = UINT_MAX;
	unsigned int rate_min = 0, rate_max = UINT_MAX;
	unsigned int rates = UINT_MAX;
	u64 formats = ULLONG_MAX;
	int i;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		cpu_stream = &cpu_dai_drv->playback;
	else
		cpu_stream = &cpu_dai_drv->capture;

	/* first calculate min/max only for CODECs in the DAI link */
	for (i = 0; i < rtd->num_codecs; i++) {

		/*
                 * Skip CODECs which don't support the current stream type.
                 * Otherwise, since the rate, channel, and format values will
                 * zero in that case, we would have no usable settings left,
                 * causing the resulting setup to fail.
                 * At least one CODEC should match, otherwise we should have
                 * bailed out on a higher level, since there would be no
                 * CODEC to support the transfer direction in that case.
                 */
		if (!snd_soc_dai_stream_valid(rtd->codec_dais[i],
					      substream->stream))
			continue;

		codec_dai_drv = rtd->codec_dais[i]->driver;
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			codec_stream = &codec_dai_drv->playback;
		else
			codec_stream = &codec_dai_drv->capture;
		chan_min = max(chan_min, codec_stream->channels_min);
		chan_max = min(chan_max, codec_stream->channels_max);
		rate_min = max(rate_min, codec_stream->rate_min);
		rate_max = min_not_zero(rate_max, codec_stream->rate_max);
		formats &= codec_stream->formats;
		rates = snd_pcm_rate_mask_intersect(codec_stream->rates, rates);
	}

	/*
         * chan min/max cannot be enforced if there are multiple CODEC DAIs
         * connected to a single CPU DAI, use CPU DAI's directly and let
         * channel allocation be fixed up later
         */
	if (rtd->num_codecs > 1) {
		chan_min = cpu_stream->channels_min;
		chan_max = cpu_stream->channels_max;
	}

	hw->channels_min = max(chan_min, cpu_stream->channels_min);
	hw->channels_max = min(chan_max, cpu_stream->channels_max);
	if (hw->formats)
		hw->formats &= formats & cpu_stream->formats;
	else
		hw->formats = formats & cpu_stream->formats;
	hw->rates = snd_pcm_rate_mask_intersect(rates, cpu_stream->rates);

	snd_pcm_limit_hw_rates(runtime);

	hw->rate_min = max(hw->rate_min, cpu_stream->rate_min);
	hw->rate_min = max(hw->rate_min, rate_min);
	hw->rate_max = min_not_zero(hw->rate_max, cpu_stream->rate_max);
	hw->rate_max = min_not_zero(hw->rate_max, rate_max);
}

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/*
 * Called by ALSA when a PCM substream is opened, the runtime->hw record is
 * then initialized and any private data can be allocated. This also calls
 * startup for the cpu DAI, platform, machine and codec DAI.
 */


static int soc_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_platform *platform = rtd->platform;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct snd_soc_dai *codec_dai;
	const char *codec_dai_name = "multicodec";
	int i, ret = 0;

	pinctrl_pm_select_default_state(cpu_dai->dev);
	for (i = 0; i < rtd->num_codecs; i++)
		pinctrl_pm_select_default_state(rtd->codec_dais[i]->dev);
	pm_runtime_get_sync(cpu_dai->dev);
	for (i = 0; i < rtd->num_codecs; i++)
		pm_runtime_get_sync(rtd->codec_dais[i]->dev);
	pm_runtime_get_sync(platform->dev);

	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);

	/* startup the audio subsystem */
	if (cpu_dai->driver->ops && cpu_dai->driver->ops->startup) {
		ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
		if (ret < 0) {
			dev_err(cpu_dai->dev, "ASoC: can't open interface"
				" %s: %d\n", cpu_dai->name, ret);
			goto out;
		}
	}

	if (platform->driver->ops && platform->driver->ops->open) {
		ret = platform->driver->ops->open(substream);
		if (ret < 0) {
			dev_err(platform->dev, "ASoC: can't open platform"
				" %s: %d\n", platform->component.name, ret);
			goto platform_err;
		}
	}

	for (i = 0; i < rtd->num_codecs; i++) {
		codec_dai = rtd->codec_dais[i];
		if (codec_dai->driver->ops && codec_dai->driver->ops->startup) {
			ret = codec_dai->driver->ops->startup(substream,
							      codec_dai);
			if (ret < 0) {
				dev_err(codec_dai->dev,
					"ASoC: can't open codec %s: %d\n",
					codec_dai->name, ret);
				goto codec_dai_err;
			}
		}

		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			codec_dai->tx_mask = 0;
		else
			codec_dai->rx_mask = 0;
	}

	if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
		ret = rtd->dai_link->ops->startup(substream);
		if (ret < 0) {
			pr_err("ASoC: %s startup failed: %d\n",
			       rtd->dai_link->name, ret);
			goto machine_err;
		}
	}

	/* Dynamic PCM DAI links compat checks use dynamic capabilities */
	if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
		goto dynamic;

	/* Check that the codec and cpu DAIs are compatible */
	soc_pcm_init_runtime_hw(substream);

	if (rtd->num_codecs == 1)
		codec_dai_name = rtd->codec_dai->name;

	if (soc_pcm_has_symmetry(substream))
		runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;

	ret = -EINVAL;
	if (!runtime->hw.rates) {
		printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",
			codec_dai_name, cpu_dai->name);
		goto config_err;
	}
	if (!runtime->hw.formats) {
		printk(KERN_ERR "ASoC: %s <-> %s No matching formats\n",
			codec_dai_name, cpu_dai->name);
		goto config_err;
	}
	if (!runtime->hw.channels_min || !runtime->hw.channels_max ||
	    runtime->hw.channels_min > runtime->hw.channels_max) {
		printk(KERN_ERR "ASoC: %s <-> %s No matching channels\n",
				codec_dai_name, cpu_dai->name);
		goto config_err;
	}

	soc_pcm_apply_msb(substream);

	/* Symmetry only applies if we've already got an active stream. */
	if (cpu_dai->active) {
		ret = soc_pcm_apply_symmetry(substream, cpu_dai);
		if (ret != 0)
			goto config_err;
	}

	for (i = 0; i < rtd->num_codecs; i++) {
		if (rtd->codec_dais[i]->active) {
			ret = soc_pcm_apply_symmetry(substream,
						     rtd->codec_dais[i]);
			if (ret != 0)
				goto config_err;
		}
	}

	pr_debug("ASoC: %s <-> %s info:\n",
			codec_dai_name, cpu_dai->name);
	pr_debug("ASoC: rate mask 0x%x\n", runtime->hw.rates);
	pr_debug("ASoC: min ch %d max ch %d\n", runtime->hw.channels_min,
		 runtime->hw.channels_max);
	pr_debug("ASoC: min rate %d max rate %d\n", runtime->hw.rate_min,
		 runtime->hw.rate_max);

dynamic:

	snd_soc_runtime_activate(rtd, substream->stream);

	mutex_unlock(&rtd->pcm_mutex);
	return 0;

config_err:
	if (rtd->dai_link->ops && rtd->dai_link->ops->shutdown)
		rtd->dai_link->ops->shutdown(substream);

machine_err:
	i = rtd->num_codecs;

codec_dai_err:
	while (--i >= 0) {
		codec_dai = rtd->codec_dais[i];
		if (codec_dai->driver->ops->shutdown)
			codec_dai->driver->ops->shutdown(substream, codec_dai);
	}

	if (platform->driver->ops && platform->driver->ops->close