init android origin source code

1 files changed, 707 insertions, 0 deletions

diff --git a/ANDROID_3.4.5/sound/soc/soc-pcm.c b/ANDROID_3.4.5/sound/soc/soc-pcm.c
new file mode 100644
index 00000000..0ad8dcac
--- /dev/null
+++ b/ANDROID_3.4.5/sound/soc/soc-pcm.c
@@ -0,0 +1,707 @@
+/*
+ * 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;
+}
+
+/*
+ * List of sample sizes that might go over the bus for parameter
+ * application.  There ought to be a wildcard sample size for things
+ * like the DAC/ADC resolution to use but there isn't right now.
+ */
+static int sample_sizes[] = {
+	24, 32,
+};
+
+static void soc_pcm_apply_msb(struct snd_pcm_substream *substream,
+			      struct snd_soc_dai *dai)
+{
+	int ret, i, bits;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		bits = dai->driver->playback.sig_bits;
+	else
+		bits = dai->driver->capture.sig_bits;
+
+	if (!bits)
+		return;
+
+	for (i = 0; i < ARRAY_SIZE(sample_sizes); i++) {
+		if (bits >= sample_sizes[i])
+			continue;
+
+		ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0,
+						   sample_sizes[i], bits);
+		if (ret != 0)
+			dev_warn(dai->dev,
+				 "Failed to set MSB %d/%d: %d\n",
+				 bits, sample_sizes[i], ret);
+	}
+}
+
+/*
+ * 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) {
+			dev_err(cpu_dai->dev, "can't open interface %s: %d\n",
+				cpu_dai->name, ret);
+			goto out;
+		}
+	}
+
+	if (platform->driver->ops && platform->driver->ops->open) {
+		ret = platform->driver->ops->open(substream);
+		if (ret < 0) {
+			dev_err(platform->dev, "can't open platform %s: %d\n",
+				platform->name, ret);
+			goto platform_err;
+		}
+	}
+
+	if (codec_dai->driver->ops->startup) {
+		ret = codec_dai->driver->ops->startup(substream, codec_dai);
+		if (ret < 0) {
+			dev_err(codec_dai->dev, "can't open codec %s: %d\n",
+				codec_dai->name, ret);
+			goto codec_dai_err;
+		}
+	}
+
+	if (rtd->dai_link->ops && rtd->dai_link->ops->startup) {
+		ret = rtd->dai_link->ops->startup(substream);
+		if (ret < 0) {
+			pr_err("asoc: %s startup failed: %d\n",
+			       rtd->dai_link->name, ret);
+			goto machine_err;
+		}
+	}
+
+	/* 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;
+	}
+
+	soc_pcm_apply_msb(substream, codec_dai);
+	soc_pcm_apply_msb(substream, cpu_dai);
+
+	/* 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, SNDRV_PCM_STREAM_PLAYBACK,
+					  codec_dai, 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 (!rtd->pmdown_time || codec->ignore_pmdown_time ||
+		    rtd->dai_link->ignore_pmdown_time) {
+			/* powered down playback stream now */
+			snd_soc_dapm_stream_event(rtd,
+						  SNDRV_PCM_STREAM_PLAYBACK,
+						  codec_dai,
+						  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, SNDRV_PCM_STREAM_CAPTURE,
+					  codec_dai, 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) {
+			pr_err("asoc: machine prepare error: %d\n", ret);
+			goto out;
+		}
+	}
+
+	if (platform->driver->ops && platform->driver->ops->prepare) {
+		ret = platform->driver->ops->prepare(substream);
+		if (ret < 0) {
+			dev_err(platform->dev, "platform prepare error: %d\n",
+				ret);
+			goto out;
+		}
+	}
+
+	if (codec_dai->driver->ops->prepare) {
+		ret = codec_dai->driver->ops->prepare(substream, codec_dai);
+		if (ret < 0) {
+			dev_err(codec_dai->dev, "DAI prepare error: %d\n",
+				ret);
+			goto out;
+		}
+	}
+
+	if (cpu_dai->driver->ops->prepare) {
+		ret = cpu_dai->driver->ops->prepare(substream, cpu_dai);
+		if (ret < 0) {
+			dev_err(cpu_dai->dev, "DAI prepare error: %d\n",
+				ret);
+			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);
+	}
+
+	snd_soc_dapm_stream_event(rtd, substream->stream, codec_dai,
+				  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) {
+			pr_err("asoc: machine hw_params failed: %d\n", ret);
+			goto out;
+		}
+	}
+
+	if (codec_dai->driver->ops->hw_params) {
+		ret = codec_dai->driver->ops->hw_params(substream, params, codec_dai);
+		if (ret < 0) {
+			dev_err(codec_dai->dev, "can't set %s hw params: %d\n",
+				codec_dai->name, ret);
+			goto codec_err;
+		}
+	}
+
+	if (cpu_dai->driver->ops->hw_params) {
+		ret = cpu_dai->driver->ops->hw_params(substream, params, cpu_dai);
+		if (ret < 0) {
+			dev_err(cpu_dai->dev, "%s hw params failed: %d\n",
+				cpu_dai->name, ret);
+			goto interface_err;
+		}
+	}
+
+	if (platform->driver->ops && platform->driver->ops->hw_params) {
+		ret = platform->driver->ops->hw_params(substream, params);
+		if (ret < 0) {
+			dev_err(platform->dev, "%s hw params failed: %d\n",
+			       platform->name, ret);
+			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;
+}