ASoC: core - Separate out PCM operations into new file.

In preparation for Dynamic PCM support (AKA DSP support).

There will be future patches that add support to allow PCMs to be dynamically
routed to multiple DAIs at startup and also during stream runtime. This patch
moves the ASoC core PCM operaitions into a new file called soc-pcm.c.  This will
in simplify the ASoC core features into distinct files.

Signed-off-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

3 files changed, 641 insertions, 612 deletions

diff --git a/sound/soc/Makefile b/sound/soc/Makefile
index 1ed61c5..adb5719 100644
--- a/sound/soc/Makefile
+++ b/sound/soc/Makefile
@@ -1,4 +1,4 @@
-snd-soc-core-objs := soc-core.o soc-dapm.o soc-jack.o soc-cache.o soc-utils.o
+snd-soc-core-objs := soc-core.o soc-dapm.o soc-jack.o soc-cache.o soc-utils.o soc-pcm.o
 
 obj-$(CONFIG_SND_SOC)	+= snd-soc-core.o
 obj-$(CONFIG_SND_SOC)	+= codecs/
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index df5608d..32d7d2f 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -44,7 +44,6 @@
 
 #define NAME_SIZE	32
 
-static DEFINE_MUTEX(pcm_mutex);
 static DECLARE_WAIT_QUEUE_HEAD(soc_pm_waitq);
 
 #ifdef CONFIG_DEBUG_FS
@@ -58,7 +57,7 @@ static LIST_HEAD(dai_list);
 static LIST_HEAD(platform_list);
 static LIST_HEAD(codec_list);
 
-static int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num);
+int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num);
 
 /*
  * This is a timeout to do a DAPM powerdown after a stream is closed().
@@ -485,552 +484,6 @@ static int soc_ac97_dev_register(struct snd_soc_codec *codec)
 }
 #endif
 
-static int soc_pcm_apply_symmetry(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 = rtd->codec_dai;
-	int ret;
-
-	if (!codec_dai->driver->symmetric_rates &&
-	    !cpu_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 (!rtd->rate) {
-		dev_warn(&rtd->dev,
-			 "Not enforcing symmetric_rates due to race\n");
-		return 0;
-	}
-
-	dev_dbg(&rtd->dev, "Symmetry forces %dHz rate\n", rtd->rate);
-
-	ret = snd_pcm_hw_constraint_minmax(substream->runtime,
-					   SNDRV_PCM_HW_PARAM_RATE,
-					   rtd->rate, rtd->rate);
-	if (ret < 0) {
-		dev_err(&rtd->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(&pcm_mutex);
-
-	/* 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 || codec_dai->active) {
-		ret = soc_pcm_apply_symmetry(substream);
-		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(&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(&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(&pcm_mutex);
-
-	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(&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_codec_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(&pcm_mutex);
-
-	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--;
-
-	/* 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) {
-		/* 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(&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(&pcm_mutex);
-
-	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(&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(&pcm_mutex);
-
-	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;
-		}
-	}
-
-	rtd->rate = params_rate(params);
-
-out:
-	mutex_unlock(&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(&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(&pcm_mutex);
-
-	/* 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(&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_codec_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,
-};
-
 #ifdef CONFIG_PM_SLEEP
 /* powers down audio subsystem for suspend */
 int snd_soc_suspend(struct device *dev)
@@ -1692,9 +1145,6 @@ static int soc_probe_dai_link(struct snd_soc_card *card, int num, int order)
 	if (order != SND_SOC_COMP_ORDER_LAST)
 		return 0;
 
-	/* DAPM dai link stream work */
-	INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
-
 	ret = soc_post_component_init(card, codec, num, 0);
 	if (ret)
 		return ret;
@@ -2114,66 +1564,6 @@ static struct platform_driver soc_driver = {
 	.remove		= soc_remove,
 };
 
-/* create a new pcm */
-static 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;
-	}
-
-	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;
-}
-
 /**
  * snd_soc_codec_volatile_register: Report if a register is volatile.
  *
diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
new file mode 100644
index 0000000..9bebee8
--- /dev/null
+++ b/sound/soc/soc-pcm.c
@@ -0,0 +1,639 @@
+/*
+ * 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 DEFINE_MUTEX(pcm_mutex);
+
+static int soc_pcm_apply_symmetry(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 = rtd->codec_dai;
+	int ret;
+
+	if (!codec_dai->driver->symmetric_rates &&
+	    !cpu_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 (!rtd->rate) {
+		dev_warn(&rtd->dev,
+			 "Not enforcing symmetric_rates due to race\n");
+		return 0;
+	}
+
+	dev_dbg(&rtd->dev, "Symmetry forces %dHz rate\n", rtd->rate);
+
+	ret = snd_pcm_hw_constraint_minmax(substream->runtime,
+					   SNDRV_PCM_HW_PARAM_RATE,
+					   rtd->rate, rtd->rate);
+	if (ret < 0) {
+		dev_err(&rtd->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(&pcm_mutex);
+
+	/* 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 || codec_dai->active) {
+		ret = soc_pcm_apply_symmetry(substream);
+		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(&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(&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(&pcm_mutex);
+
+	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(&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_codec_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(&pcm_mutex);
+
+	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--;
+
+	/* 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) {
+		/* 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(&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(&pcm_mutex);
+
+	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(&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(&pcm_mutex);
+
+	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;
+		}
+	}
+
+	rtd->rate = params_rate(params);
+
+out:
+	mutex_unlock(&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(&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(&pcm_mutex);
+
+	/* 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(&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_codec_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;
+}