text: /*
   * 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/pm_runtime.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;
  
  	pm_runtime_get_sync(cpu_dai->dev);
  	pm_runtime_get_sync(codec_dai->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->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);
  
  	pm_runtime_put(platform->dev);
  	pm_runtime_put(codec_dai->dev);
  	pm_runtime_put(cpu_dai->dev);
  
  	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 (codec->ignore_pmdown_time ||
  		    rtd->dai_link->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);
  
  	pm_runtime_put(platform->dev);
  	pm_runtime_put(codec_dai->dev);
  	pm_runtime_put(cpu_dai->dev);
  
  	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;
  }
  
  /* 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_ops *soc_pcm_ops = &rtd->ops;
  	struct snd_pcm *pcm;
  	char new_name[64];
  	int ret = 0, playback = 0, capture = 0;
  
  	soc_pcm_ops->open	= soc_pcm_open;
  	soc_pcm_ops->close	= soc_pcm_close;
  	soc_pcm_ops->hw_params	= soc_pcm_hw_params;
  	soc_pcm_ops->hw_free	= soc_pcm_hw_free;
  	soc_pcm_ops->prepare	= soc_pcm_prepare;
  	soc_pcm_ops->trigger	= soc_pcm_trigger;
  	soc_pcm_ops->pointer	= soc_pcm_pointer;
  
  	/* 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;
  }
  