sound/soc/soc-pcm.c - kernel/mindspeed - Git at Google

 /*
  * 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/slab.h>
 #include <linux/workqueue.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/initval.h>

 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->driver->symmetric_rates &&
 	    !rtd->dai_link->symmetric_rates)
 		return 0;

 	/* This can happen if multiple streams are starting simultaneously -
 	 * the second can need to get its constraints before the first has
 	 * picked a rate.  Complain and allow the application to carry on.
 	 */
 	if (!soc_dai->rate) {
 		dev_warn(soc_dai->dev,
 			 "Not enforcing symmetric_rates due to race\n");
 		return 0;
 	}

 	dev_dbg(soc_dai->dev, "Symmetry forces %dHz rate\n", soc_dai->rate);

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

 	return 0;
 }

 /*
  * 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 = rtd->codec_dai;
 	struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
 	struct snd_soc_dai_driver *codec_dai_drv = codec_dai->driver;
 	int ret = 0;

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

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

 	if (platform->driver->ops && platform->driver->ops->open) {
 		ret = platform->driver->ops->open(substream);
 		if (ret < 0) {
 			printk(KERN_ERR "asoc: can't open platform %s\n", platform->name);
 			goto platform_err;
 		}
 	}

 	if (codec_dai->driver->ops->startup) {
 		ret = codec_dai->driver->ops->startup(substream, codec_dai);
 		if (ret < 0) {
 			printk(KERN_ERR "asoc: can't open codec %s\n",
 				codec_dai->name);
 			goto codec_dai_err;
 		}
 	}

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

 	/* Check that the codec and cpu DAIs are compatible */
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		runtime->hw.rate_min =
 			max(codec_dai_drv->playback.rate_min,
 			    cpu_dai_drv->playback.rate_min);
 		runtime->hw.rate_max =
 			min(codec_dai_drv->playback.rate_max,
 			    cpu_dai_drv->playback.rate_max);
 		runtime->hw.channels_min =
 			max(codec_dai_drv->playback.channels_min,
 				cpu_dai_drv->playback.channels_min);
 		runtime->hw.channels_max =
 			min(codec_dai_drv->playback.channels_max,
 				cpu_dai_drv->playback.channels_max);
 		runtime->hw.formats =
 			codec_dai_drv->playback.formats & cpu_dai_drv->playback.formats;
 		runtime->hw.rates =
 			codec_dai_drv->playback.rates & cpu_dai_drv->playback.rates;
 		if (codec_dai_drv->playback.rates
 			   & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 			runtime->hw.rates |= cpu_dai_drv->playback.rates;
 		if (cpu_dai_drv->playback.rates
 			   & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 			runtime->hw.rates |= codec_dai_drv->playback.rates;
 	} else {
 		runtime->hw.rate_min =
 			max(codec_dai_drv->capture.rate_min,
 			    cpu_dai_drv->capture.rate_min);
 		runtime->hw.rate_max =
 			min(codec_dai_drv->capture.rate_max,
 			    cpu_dai_drv->capture.rate_max);
 		runtime->hw.channels_min =
 			max(codec_dai_drv->capture.channels_min,
 				cpu_dai_drv->capture.channels_min);
 		runtime->hw.channels_max =
 			min(codec_dai_drv->capture.channels_max,
 				cpu_dai_drv->capture.channels_max);
 		runtime->hw.formats =
 			codec_dai_drv->capture.formats & cpu_dai_drv->capture.formats;
 		runtime->hw.rates =
 			codec_dai_drv->capture.rates & cpu_dai_drv->capture.rates;
 		if (codec_dai_drv->capture.rates
 			   & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 			runtime->hw.rates |= cpu_dai_drv->capture.rates;
 		if (cpu_dai_drv->capture.rates
 			   & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))
 			runtime->hw.rates |= codec_dai_drv->capture.rates;
 	}

 	ret = -EINVAL;
 	snd_pcm_limit_hw_rates(runtime);
 	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;
 	}

 	/* 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;
 	}

 	if (codec_dai->active) {
 		ret = soc_pcm_apply_symmetry(substream, codec_dai);
 		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);

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		cpu_dai->playback_active++;
 		codec_dai->playback_active++;
 	} else {
 		cpu_dai->capture_active++;
 		codec_dai->capture_active++;
 	}
 	cpu_dai->active++;
 	codec_dai->active++;
 	rtd->codec->active++;
 	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:
 	if (codec_dai->driver->ops->shutdown)
 		codec_dai->driver->ops->shutdown(substream, codec_dai);

 codec_dai_err:
 	if (platform->driver->ops && platform->driver->ops->close)
 		platform->driver->ops->close(substream);

 platform_err:
 	if (cpu_dai->driver->ops->shutdown)
 		cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 out:
 	mutex_unlock(&rtd->pcm_mutex);
 	return ret;
 }

 /*
  * Power down the audio subsystem pmdown_time msecs after close is called.
  * This is to ensure there are no pops or clicks in between any music tracks
  * due to DAPM power cycling.
  */
 static void close_delayed_work(struct work_struct *work)
 {
 	struct snd_soc_pcm_runtime *rtd =
 			container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;

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

 	pr_debug("pop wq checking: %s status: %s waiting: %s\n",
 		 codec_dai->driver->playback.stream_name,
 		 codec_dai->playback_active ? "active" : "inactive",
 		 codec_dai->pop_wait ? "yes" : "no");

 	/* are we waiting on this codec DAI stream */
 	if (codec_dai->pop_wait == 1) {
 		codec_dai->pop_wait = 0;
 		snd_soc_dapm_stream_event(rtd,
 			codec_dai->driver->playback.stream_name,
 			SND_SOC_DAPM_STREAM_STOP);
 	}

 	mutex_unlock(&rtd->pcm_mutex);
 }

 /*
  * Called by ALSA when a PCM substream is closed. Private data can be
  * freed here. The cpu DAI, codec DAI, machine and platform are also
  * shutdown.
  */
 static int soc_pcm_close(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_platform *platform = rtd->platform;
 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	struct snd_soc_codec *codec = rtd->codec;

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

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		cpu_dai->playback_active--;
 		codec_dai->playback_active--;
 	} else {
 		cpu_dai->capture_active--;
 		codec_dai->capture_active--;
 	}

 	cpu_dai->active--;
 	codec_dai->active--;
 	codec->active--;

 	/* clear the corresponding DAIs rate when inactive */
 	if (!cpu_dai->active)
 		cpu_dai->rate = 0;

 	if (!codec_dai->active)
 		codec_dai->rate = 0;

 	/* Muting the DAC suppresses artifacts caused during digital
 	 * shutdown, for example from stopping clocks.
 	 */
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		snd_soc_dai_digital_mute(codec_dai, 1);

 	if (cpu_dai->driver->ops->shutdown)
 		cpu_dai->driver->ops->shutdown(substream, cpu_dai);

 	if (codec_dai->driver->ops->shutdown)
 		codec_dai->driver->ops->shutdown(substream, codec_dai);

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

 	if (platform->driver->ops && platform->driver->ops->close)
 		platform->driver->ops->close(substream);
 	cpu_dai->runtime = NULL;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		if (unlikely(codec->ignore_pmdown_time)) {
 			/* powered down playback stream now */
 			snd_soc_dapm_stream_event(rtd,
 				codec_dai->driver->playback.stream_name,
 				SND_SOC_DAPM_STREAM_STOP);
 		} else {
 			/* start delayed pop wq here for playback streams */
 			codec_dai->pop_wait = 1;
 			schedule_delayed_work(&rtd->delayed_work,
 				msecs_to_jiffies(rtd->pmdown_time));
 		}
 	} else {
 		/* capture streams can be powered down now */
 		snd_soc_dapm_stream_event(rtd,
 			codec_dai->driver->capture.stream_name,
 			SND_SOC_DAPM_STREAM_STOP);
 	}

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

 /*
  * Called by ALSA when the PCM substream is prepared, can set format, sample
  * rate, etc.  This function is non atomic and can be called multiple times,
  * it can refer to the runtime info.
  */
 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_platform *platform = rtd->platform;
 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	int ret = 0;

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

 	if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
 		ret = rtd->dai_link->ops->prepare(substream);
 		if (ret < 0) {
 			printk(KERN_ERR "asoc: machine prepare error\n");
 			goto out;
 		}
 	}

 	if (platform->driver->ops && platform->driver->ops->prepare) {
 		ret = platform->driver->ops->prepare(substream);
 		if (ret < 0) {
 			printk(KERN_ERR "asoc: platform prepare error\n");
 			goto out;
 		}
 	}

 	if (codec_dai->driver->ops->prepare) {
 		ret = codec_dai->driver->ops->prepare(substream, codec_dai);
 		if (ret < 0) {
 			printk(KERN_ERR "asoc: codec DAI prepare error\n");
 			goto out;
 		}
 	}

 	if (cpu_dai->driver->ops->prepare) {
 		ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
 		if (ret < 0) {
 			printk(KERN_ERR "asoc: cpu DAI prepare error\n");
 			goto out;
 		}
 	}

 	/* cancel any delayed stream shutdown that is pending */
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 	    codec_dai->pop_wait) {
 		codec_dai->pop_wait = 0;
 		cancel_delayed_work(&rtd->delayed_work);
 	}

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		snd_soc_dapm_stream_event(rtd,
 					  codec_dai->driver->playback.stream_name,
 					  SND_SOC_DAPM_STREAM_START);
 	else
 		snd_soc_dapm_stream_event(rtd,
 					  codec_dai->driver->capture.stream_name,
 					  SND_SOC_DAPM_STREAM_START);

 	snd_soc_dai_digital_mute(codec_dai, 0);

 out:
 	mutex_unlock(&rtd->pcm_mutex);
 	return ret;
 }

 /*
  * Called by ALSA when the hardware params are set by application. This
  * function can also be called multiple times and can allocate buffers
  * (using snd_pcm_lib_* ). It's non-atomic.
  */
 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 				struct snd_pcm_hw_params *params)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_platform *platform = rtd->platform;
 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	int ret = 0;

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

 	if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
 		ret = rtd->dai_link->ops->hw_params(substream, params);
 		if (ret < 0) {
 			printk(KERN_ERR "asoc: machine hw_params failed\n");
 			goto out;
 		}
 	}

 	if (codec_dai->driver->ops->hw_params) {
 		ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
 		if (ret < 0) {
 			printk(KERN_ERR "asoc: can't set codec %s hw params\n",
 				codec_dai->name);
 			goto codec_err;
 		}
 	}

 	if (cpu_dai->driver->ops->hw_params) {
 		ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
 		if (ret < 0) {
 			printk(KERN_ERR "asoc: interface %s hw params failed\n",
 				cpu_dai->name);
 			goto interface_err;
 		}
 	}

 	if (platform->driver->ops && platform->driver->ops->hw_params) {
 		ret = platform->driver->ops->hw_params(substream, params);
 		if (ret < 0) {
 			printk(KERN_ERR "asoc: platform %s hw params failed\n",
 				platform->name);
 			goto platform_err;
 		}
 	}

 	/* store the rate for each DAIs */
 	cpu_dai->rate = params_rate(params);
 	codec_dai->rate = params_rate(params);

 out:
 	mutex_unlock(&rtd->pcm_mutex);
 	return ret;

 platform_err:
 	if (cpu_dai->driver->ops->hw_free)
 		cpu_dai->driver->ops->hw_free(substream, cpu_dai);

 interface_err:
 	if (codec_dai->driver->ops->hw_free)
 		codec_dai->driver->ops->hw_free(substream, codec_dai);

 codec_err:
 	if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 		rtd->dai_link->ops->hw_free(substream);

 	mutex_unlock(&rtd->pcm_mutex);
 	return ret;
 }

 /*
  * Frees resources allocated by hw_params, can be called multiple times
  */
 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_platform *platform = rtd->platform;
 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	struct snd_soc_codec *codec = rtd->codec;

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

 	/* apply codec digital mute */
 	if (!codec->active)
 		snd_soc_dai_digital_mute(codec_dai, 1);

 	/* free any machine hw params */
 	if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 		rtd->dai_link->ops->hw_free(substream);

 	/* free any DMA resources */
 	if (platform->driver->ops && platform->driver->ops->hw_free)
 		platform->driver->ops->hw_free(substream);

 	/* now free hw params for the DAIs  */
 	if (codec_dai->driver->ops->hw_free)
 		codec_dai->driver->ops->hw_free(substream, codec_dai);

 	if (cpu_dai->driver->ops->hw_free)
 		cpu_dai->driver->ops->hw_free(substream, cpu_dai);

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

 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_platform *platform = rtd->platform;
 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	int ret;

 	if (codec_dai->driver->ops->trigger) {
 		ret = codec_dai->driver->ops->trigger(substream, cmd, codec_dai);
 		if (ret < 0)
 			return ret;
 	}

 	if (platform->driver->ops && platform->driver->ops->trigger) {
 		ret = platform->driver->ops->trigger(substream, cmd);
 		if (ret < 0)
 			return ret;
 	}

 	if (cpu_dai->driver->ops->trigger) {
 		ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
 		if (ret < 0)
 			return ret;
 	}
 	return 0;
 }

 /*
  * soc level wrapper for pointer callback
  * If cpu_dai, codec_dai, platform driver has the delay callback, than
  * the runtime->delay will be updated accordingly.
  */
 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_platform *platform = rtd->platform;
 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	snd_pcm_uframes_t offset = 0;
 	snd_pcm_sframes_t delay = 0;

 	if (platform->driver->ops && platform->driver->ops->pointer)
 		offset = platform->driver->ops->pointer(substream);

 	if (cpu_dai->driver->ops->delay)
 		delay += cpu_dai->driver->ops->delay(substream, cpu_dai);

 	if (codec_dai->driver->ops->delay)
 		delay += codec_dai->driver->ops->delay(substream, codec_dai);

 	if (platform->driver->delay)
 		delay += platform->driver->delay(substream, codec_dai);

 	runtime->delay = delay;

 	return offset;
 }

 /* ASoC PCM operations */
 static struct snd_pcm_ops soc_pcm_ops = {
 	.open		= soc_pcm_open,
 	.close		= soc_pcm_close,
 	.hw_params	= soc_pcm_hw_params,
 	.hw_free	= soc_pcm_hw_free,
 	.prepare	= soc_pcm_prepare,
 	.trigger	= soc_pcm_trigger,
 	.pointer	= soc_pcm_pointer,
 };

 /* create a new pcm */
 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
 {
 	struct snd_soc_codec *codec = rtd->codec;
 	struct snd_soc_platform *platform = rtd->platform;
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 	struct snd_pcm *pcm;
 	char new_name[64];
 	int ret = 0, playback = 0, capture = 0;

 	/* check client and interface hw capabilities */
 	snprintf(new_name, sizeof(new_name), "%s %s-%d",
 			rtd->dai_link->stream_name, codec_dai->name, num);

 	if (codec_dai->driver->playback.channels_min)
 		playback = 1;
 	if (codec_dai->driver->capture.channels_min)
 		capture = 1;

 	dev_dbg(rtd->card->dev, "registered pcm #%d %s\n",num,new_name);
 	ret = snd_pcm_new(rtd->card->snd_card, new_name,
 			num, playback, capture, &pcm);
 	if (ret < 0) {
 		printk(KERN_ERR "asoc: can't create pcm for codec %s\n", codec->name);
 		return ret;
 	}

 	/* DAPM dai link stream work */
 	INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);

 	rtd->pcm = pcm;
 	pcm->private_data = rtd;
 	if (platform->driver->ops) {
 		soc_pcm_ops.mmap = platform->driver->ops->mmap;
 		soc_pcm_ops.pointer = platform->driver->ops->pointer;
 		soc_pcm_ops.ioctl = platform->driver->ops->ioctl;
 		soc_pcm_ops.copy = platform->driver->ops->copy;
 		soc_pcm_ops.silence = platform->driver->ops->silence;
 		soc_pcm_ops.ack = platform->driver->ops->ack;
 		soc_pcm_ops.page = platform->driver->ops->page;
 	}

 	if (playback)
 		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &soc_pcm_ops);

 	if (capture)
 		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &soc_pcm_ops);

 	if (platform->driver->pcm_new) {
 		ret = platform->driver->pcm_new(rtd);
 		if (ret < 0) {
 			pr_err("asoc: platform pcm constructor failed\n");
 			return ret;
 		}
 	}

 	pcm->private_free = platform->driver->pcm_free;
 	printk(KERN_INFO "asoc: %s <-> %s mapping ok\n", codec_dai->name,
 		cpu_dai->name);
 	return ret;
 }
	/*
	* 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/slab.h>
	#include <linux/workqueue.h>
	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>
	#include <sound/initval.h>

	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->driver->symmetric_rates &&
	!rtd->dai_link->symmetric_rates)
	return 0;

	/* This can happen if multiple streams are starting simultaneously -
	* the second can need to get its constraints before the first has
	* picked a rate. Complain and allow the application to carry on.
	*/
	if (!soc_dai->rate) {
	dev_warn(soc_dai->dev,
	"Not enforcing symmetric_rates due to race\n");
	return 0;
	}

	dev_dbg(soc_dai->dev, "Symmetry forces %dHz rate\n", soc_dai->rate);

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

	return 0;
	}

	/*
	* 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 = rtd->codec_dai;
	struct snd_soc_dai_driver *cpu_dai_drv = cpu_dai->driver;
	struct snd_soc_dai_driver *codec_dai_drv = codec_dai->driver;
	int ret = 0;

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

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

	if (platform->driver->ops && platform->driver->ops->open) {
	ret = platform->driver->ops->open(substream);
	if (ret < 0) {
	printk(KERN_ERR "asoc: can't open platform %s\n", platform->name);
	goto platform_err;
	}
	}

	if (codec_dai->driver->ops->startup) {
	ret = codec_dai->driver->ops->startup(substream, codec_dai);
	if (ret < 0) {
	printk(KERN_ERR "asoc: can't open codec %s\n",
	codec_dai->name);
	goto codec_dai_err;
	}
	}

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

	/* Check that the codec and cpu DAIs are compatible */
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	runtime->hw.rate_min =
	max(codec_dai_drv->playback.rate_min,
	cpu_dai_drv->playback.rate_min);
	runtime->hw.rate_max =
	min(codec_dai_drv->playback.rate_max,
	cpu_dai_drv->playback.rate_max);
	runtime->hw.channels_min =
	max(codec_dai_drv->playback.channels_min,
	cpu_dai_drv->playback.channels_min);
	runtime->hw.channels_max =
	min(codec_dai_drv->playback.channels_max,
	cpu_dai_drv->playback.channels_max);
	runtime->hw.formats =
	codec_dai_drv->playback.formats & cpu_dai_drv->playback.formats;
	runtime->hw.rates =
	codec_dai_drv->playback.rates & cpu_dai_drv->playback.rates;
	if (codec_dai_drv->playback.rates
	& (SNDRV_PCM_RATE_KNOT \| SNDRV_PCM_RATE_CONTINUOUS))
	runtime->hw.rates \|= cpu_dai_drv->playback.rates;
	if (cpu_dai_drv->playback.rates
	& (SNDRV_PCM_RATE_KNOT \| SNDRV_PCM_RATE_CONTINUOUS))
	runtime->hw.rates \|= codec_dai_drv->playback.rates;
	} else {
	runtime->hw.rate_min =
	max(codec_dai_drv->capture.rate_min,
	cpu_dai_drv->capture.rate_min);
	runtime->hw.rate_max =
	min(codec_dai_drv->capture.rate_max,
	cpu_dai_drv->capture.rate_max);
	runtime->hw.channels_min =
	max(codec_dai_drv->capture.channels_min,
	cpu_dai_drv->capture.channels_min);
	runtime->hw.channels_max =
	min(codec_dai_drv->capture.channels_max,
	cpu_dai_drv->capture.channels_max);
	runtime->hw.formats =
	codec_dai_drv->capture.formats & cpu_dai_drv->capture.formats;
	runtime->hw.rates =
	codec_dai_drv->capture.rates & cpu_dai_drv->capture.rates;
	if (codec_dai_drv->capture.rates
	& (SNDRV_PCM_RATE_KNOT \| SNDRV_PCM_RATE_CONTINUOUS))
	runtime->hw.rates \|= cpu_dai_drv->capture.rates;
	if (cpu_dai_drv->capture.rates
	& (SNDRV_PCM_RATE_KNOT \| SNDRV_PCM_RATE_CONTINUOUS))
	runtime->hw.rates \|= codec_dai_drv->capture.rates;
	}

	ret = -EINVAL;
	snd_pcm_limit_hw_rates(runtime);
	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;
	}

	/* 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;
	}

	if (codec_dai->active) {
	ret = soc_pcm_apply_symmetry(substream, codec_dai);
	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);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	cpu_dai->playback_active++;
	codec_dai->playback_active++;
	} else {
	cpu_dai->capture_active++;
	codec_dai->capture_active++;
	}
	cpu_dai->active++;
	codec_dai->active++;
	rtd->codec->active++;
	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:
	if (codec_dai->driver->ops->shutdown)
	codec_dai->driver->ops->shutdown(substream, codec_dai);

	codec_dai_err:
	if (platform->driver->ops && platform->driver->ops->close)
	platform->driver->ops->close(substream);

	platform_err:
	if (cpu_dai->driver->ops->shutdown)
	cpu_dai->driver->ops->shutdown(substream, cpu_dai);
	out:
	mutex_unlock(&rtd->pcm_mutex);
	return ret;
	}

	/*
	* Power down the audio subsystem pmdown_time msecs after close is called.
	* This is to ensure there are no pops or clicks in between any music tracks
	* due to DAPM power cycling.
	*/
	static void close_delayed_work(struct work_struct *work)
	{
	struct snd_soc_pcm_runtime *rtd =
	container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
	struct snd_soc_dai *codec_dai = rtd->codec_dai;

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

	pr_debug("pop wq checking: %s status: %s waiting: %s\n",
	codec_dai->driver->playback.stream_name,
	codec_dai->playback_active ? "active" : "inactive",
	codec_dai->pop_wait ? "yes" : "no");

	/* are we waiting on this codec DAI stream */
	if (codec_dai->pop_wait == 1) {
	codec_dai->pop_wait = 0;
	snd_soc_dapm_stream_event(rtd,
	codec_dai->driver->playback.stream_name,
	SND_SOC_DAPM_STREAM_STOP);
	}

	mutex_unlock(&rtd->pcm_mutex);
	}

	/*
	* Called by ALSA when a PCM substream is closed. Private data can be
	* freed here. The cpu DAI, codec DAI, machine and platform are also
	* shutdown.
	*/
	static int soc_pcm_close(struct snd_pcm_substream *substream)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_platform *platform = rtd->platform;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_codec *codec = rtd->codec;

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

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	cpu_dai->playback_active--;
	codec_dai->playback_active--;
	} else {
	cpu_dai->capture_active--;
	codec_dai->capture_active--;
	}

	cpu_dai->active--;
	codec_dai->active--;
	codec->active--;

	/* clear the corresponding DAIs rate when inactive */
	if (!cpu_dai->active)
	cpu_dai->rate = 0;

	if (!codec_dai->active)
	codec_dai->rate = 0;

	/* Muting the DAC suppresses artifacts caused during digital
	* shutdown, for example from stopping clocks.
	*/
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	snd_soc_dai_digital_mute(codec_dai, 1);

	if (cpu_dai->driver->ops->shutdown)
	cpu_dai->driver->ops->shutdown(substream, cpu_dai);

	if (codec_dai->driver->ops->shutdown)
	codec_dai->driver->ops->shutdown(substream, codec_dai);

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

	if (platform->driver->ops && platform->driver->ops->close)
	platform->driver->ops->close(substream);
	cpu_dai->runtime = NULL;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	if (unlikely(codec->ignore_pmdown_time)) {
	/* powered down playback stream now */
	snd_soc_dapm_stream_event(rtd,
	codec_dai->driver->playback.stream_name,
	SND_SOC_DAPM_STREAM_STOP);
	} else {
	/* start delayed pop wq here for playback streams */
	codec_dai->pop_wait = 1;
	schedule_delayed_work(&rtd->delayed_work,
	msecs_to_jiffies(rtd->pmdown_time));
	}
	} else {
	/* capture streams can be powered down now */
	snd_soc_dapm_stream_event(rtd,
	codec_dai->driver->capture.stream_name,
	SND_SOC_DAPM_STREAM_STOP);
	}

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

	/*
	* Called by ALSA when the PCM substream is prepared, can set format, sample
	* rate, etc. This function is non atomic and can be called multiple times,
	* it can refer to the runtime info.
	*/
	static int soc_pcm_prepare(struct snd_pcm_substream *substream)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_platform *platform = rtd->platform;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	int ret = 0;

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

	if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
	ret = rtd->dai_link->ops->prepare(substream);
	if (ret < 0) {
	printk(KERN_ERR "asoc: machine prepare error\n");
	goto out;
	}
	}

	if (platform->driver->ops && platform->driver->ops->prepare) {
	ret = platform->driver->ops->prepare(substream);
	if (ret < 0) {
	printk(KERN_ERR "asoc: platform prepare error\n");
	goto out;
	}
	}

	if (codec_dai->driver->ops->prepare) {
	ret = codec_dai->driver->ops->prepare(substream, codec_dai);
	if (ret < 0) {
	printk(KERN_ERR "asoc: codec DAI prepare error\n");
	goto out;
	}
	}

	if (cpu_dai->driver->ops->prepare) {
	ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
	if (ret < 0) {
	printk(KERN_ERR "asoc: cpu DAI prepare error\n");
	goto out;
	}
	}

	/* cancel any delayed stream shutdown that is pending */
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
	codec_dai->pop_wait) {
	codec_dai->pop_wait = 0;
	cancel_delayed_work(&rtd->delayed_work);
	}

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	snd_soc_dapm_stream_event(rtd,
	codec_dai->driver->playback.stream_name,
	SND_SOC_DAPM_STREAM_START);
	else
	snd_soc_dapm_stream_event(rtd,
	codec_dai->driver->capture.stream_name,
	SND_SOC_DAPM_STREAM_START);

	snd_soc_dai_digital_mute(codec_dai, 0);

	out:
	mutex_unlock(&rtd->pcm_mutex);
	return ret;
	}

	/*
	* Called by ALSA when the hardware params are set by application. This
	* function can also be called multiple times and can allocate buffers
	* (using snd_pcm_lib_* ). It's non-atomic.
	*/
	static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_platform *platform = rtd->platform;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	int ret = 0;

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

	if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
	ret = rtd->dai_link->ops->hw_params(substream, params);
	if (ret < 0) {
	printk(KERN_ERR "asoc: machine hw_params failed\n");
	goto out;
	}
	}

	if (codec_dai->driver->ops->hw_params) {
	ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
	if (ret < 0) {
	printk(KERN_ERR "asoc: can't set codec %s hw params\n",
	codec_dai->name);
	goto codec_err;
	}
	}

	if (cpu_dai->driver->ops->hw_params) {
	ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
	if (ret < 0) {
	printk(KERN_ERR "asoc: interface %s hw params failed\n",
	cpu_dai->name);
	goto interface_err;
	}
	}

	if (platform->driver->ops && platform->driver->ops->hw_params) {
	ret = platform->driver->ops->hw_params(substream, params);
	if (ret < 0) {
	printk(KERN_ERR "asoc: platform %s hw params failed\n",
	platform->name);
	goto platform_err;
	}
	}

	/* store the rate for each DAIs */
	cpu_dai->rate = params_rate(params);
	codec_dai->rate = params_rate(params);

	out:
	mutex_unlock(&rtd->pcm_mutex);
	return ret;

	platform_err:
	if (cpu_dai->driver->ops->hw_free)
	cpu_dai->driver->ops->hw_free(substream, cpu_dai);

	interface_err:
	if (codec_dai->driver->ops->hw_free)
	codec_dai->driver->ops->hw_free(substream, codec_dai);

	codec_err:
	if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
	rtd->dai_link->ops->hw_free(substream);

	mutex_unlock(&rtd->pcm_mutex);
	return ret;
	}

	/*
	* Frees resources allocated by hw_params, can be called multiple times
	*/
	static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_platform *platform = rtd->platform;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_codec *codec = rtd->codec;

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

	/* apply codec digital mute */
	if (!codec->active)
	snd_soc_dai_digital_mute(codec_dai, 1);

	/* free any machine hw params */
	if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
	rtd->dai_link->ops->hw_free(substream);

	/* free any DMA resources */
	if (platform->driver->ops && platform->driver->ops->hw_free)
	platform->driver->ops->hw_free(substream);

	/* now free hw params for the DAIs */
	if (codec_dai->driver->ops->hw_free)
	codec_dai->driver->ops->hw_free(substream, codec_dai);

	if (cpu_dai->driver->ops->hw_free)
	cpu_dai->driver->ops->hw_free(substream, cpu_dai);

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

	static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_platform *platform = rtd->platform;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	int ret;

	if (codec_dai->driver->ops->trigger) {
	ret = codec_dai->driver->ops->trigger(substream, cmd, codec_dai);
	if (ret < 0)
	return ret;
	}

	if (platform->driver->ops && platform->driver->ops->trigger) {
	ret = platform->driver->ops->trigger(substream, cmd);
	if (ret < 0)
	return ret;
	}

	if (cpu_dai->driver->ops->trigger) {
	ret = cpu_dai->driver->ops->trigger(substream, cmd, cpu_dai);
	if (ret < 0)
	return ret;
	}
	return 0;
	}

	/*
	* soc level wrapper for pointer callback
	* If cpu_dai, codec_dai, platform driver has the delay callback, than
	* the runtime->delay will be updated accordingly.
	*/
	static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_platform *platform = rtd->platform;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_pcm_runtime *runtime = substream->runtime;
	snd_pcm_uframes_t offset = 0;
	snd_pcm_sframes_t delay = 0;

	if (platform->driver->ops && platform->driver->ops->pointer)
	offset = platform->driver->ops->pointer(substream);

	if (cpu_dai->driver->ops->delay)
	delay += cpu_dai->driver->ops->delay(substream, cpu_dai);

	if (codec_dai->driver->ops->delay)
	delay += codec_dai->driver->ops->delay(substream, codec_dai);

	if (platform->driver->delay)
	delay += platform->driver->delay(substream, codec_dai);

	runtime->delay = delay;

	return offset;
	}

	/* ASoC PCM operations */
	static struct snd_pcm_ops soc_pcm_ops = {
	.open = soc_pcm_open,
	.close = soc_pcm_close,
	.hw_params = soc_pcm_hw_params,
	.hw_free = soc_pcm_hw_free,
	.prepare = soc_pcm_prepare,
	.trigger = soc_pcm_trigger,
	.pointer = soc_pcm_pointer,
	};

	/* create a new pcm */
	int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
	{
	struct snd_soc_codec *codec = rtd->codec;
	struct snd_soc_platform *platform = rtd->platform;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct snd_pcm *pcm;
	char new_name[64];
	int ret = 0, playback = 0, capture = 0;

	/* check client and interface hw capabilities */
	snprintf(new_name, sizeof(new_name), "%s %s-%d",
	rtd->dai_link->stream_name, codec_dai->name, num);

	if (codec_dai->driver->playback.channels_min)
	playback = 1;
	if (codec_dai->driver->capture.channels_min)
	capture = 1;

	dev_dbg(rtd->card->dev, "registered pcm #%d %s\n",num,new_name);
	ret = snd_pcm_new(rtd->card->snd_card, new_name,
	num, playback, capture, &pcm);
	if (ret < 0) {
	printk(KERN_ERR "asoc: can't create pcm for codec %s\n", codec->name);
	return ret;
	}

	/* DAPM dai link stream work */
	INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);

	rtd->pcm = pcm;
	pcm->private_data = rtd;
	if (platform->driver->ops) {
	soc_pcm_ops.mmap = platform->driver->ops->mmap;
	soc_pcm_ops.pointer = platform->driver->ops->pointer;
	soc_pcm_ops.ioctl = platform->driver->ops->ioctl;
	soc_pcm_ops.copy = platform->driver->ops->copy;
	soc_pcm_ops.silence = platform->driver->ops->silence;
	soc_pcm_ops.ack = platform->driver->ops->ack;
	soc_pcm_ops.page = platform->driver->ops->page;
	}

	if (playback)
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &soc_pcm_ops);

	if (capture)
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &soc_pcm_ops);

	if (platform->driver->pcm_new) {
	ret = platform->driver->pcm_new(rtd);
	if (ret < 0) {
	pr_err("asoc: platform pcm constructor failed\n");
	return ret;
	}
	}

	pcm->private_free = platform->driver->pcm_free;
	printk(KERN_INFO "asoc: %s <-> %s mapping ok\n", codec_dai->name,
	cpu_dai->name);
	return ret;
	}