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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0+
 //
 // 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>
 
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/pm_runtime.h>
 #include <linux/slab.h>
 #include <linux/workqueue.h>
 #include <linux/export.h>
 #include <linux/debugfs.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/soc-dpcm.h>
 #include <sound/soc-link.h>
 #include <sound/initval.h>
 
 static inline void snd_soc_dpcm_mutex_lock(struct snd_soc_pcm_runtime *rtd)
 {
     mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);
 }
 
 static inline void snd_soc_dpcm_mutex_unlock(struct snd_soc_pcm_runtime *rtd)
 {
     mutex_unlock(&rtd->card->pcm_mutex);
 }
 
 #define snd_soc_dpcm_mutex_assert_held(rtd) \
     lockdep_assert_held(&(rtd)->card->pcm_mutex)
 
 static inline void snd_soc_dpcm_stream_lock_irq(struct snd_soc_pcm_runtime *rtd,
                         int stream)
 {
     snd_pcm_stream_lock_irq(snd_soc_dpcm_get_substream(rtd, stream));
 }
 
 #define snd_soc_dpcm_stream_lock_irqsave_nested(rtd, stream, flags) \
     snd_pcm_stream_lock_irqsave_nested(snd_soc_dpcm_get_substream(rtd, stream), flags)
 
 static inline void snd_soc_dpcm_stream_unlock_irq(struct snd_soc_pcm_runtime *rtd,
                           int stream)
 {
     snd_pcm_stream_unlock_irq(snd_soc_dpcm_get_substream(rtd, stream));
 }
 
 #define snd_soc_dpcm_stream_unlock_irqrestore(rtd, stream, flags) \
     snd_pcm_stream_unlock_irqrestore(snd_soc_dpcm_get_substream(rtd, stream), flags)
 
 #define DPCM_MAX_BE_USERS   8
 
 static inline const char *soc_cpu_dai_name(struct snd_soc_pcm_runtime *rtd)
 {
     return (rtd)->num_cpus == 1 ? asoc_rtd_to_cpu(rtd, 0)->name : "multicpu";
 }
 static inline const char *soc_codec_dai_name(struct snd_soc_pcm_runtime *rtd)
 {
     return (rtd)->num_codecs == 1 ? asoc_rtd_to_codec(rtd, 0)->name : "multicodec";
 }
 
 #ifdef CONFIG_DEBUG_FS
 static const char *dpcm_state_string(enum snd_soc_dpcm_state state)
 {
     switch (state) {
     case SND_SOC_DPCM_STATE_NEW:
         return "new";
     case SND_SOC_DPCM_STATE_OPEN:
         return "open";
     case SND_SOC_DPCM_STATE_HW_PARAMS:
         return "hw_params";
     case SND_SOC_DPCM_STATE_PREPARE:
         return "prepare";
     case SND_SOC_DPCM_STATE_START:
         return "start";
     case SND_SOC_DPCM_STATE_STOP:
         return "stop";
     case SND_SOC_DPCM_STATE_SUSPEND:
         return "suspend";
     case SND_SOC_DPCM_STATE_PAUSED:
         return "paused";
     case SND_SOC_DPCM_STATE_HW_FREE:
         return "hw_free";
     case SND_SOC_DPCM_STATE_CLOSE:
         return "close";
     }
 
     return "unknown";
 }
 
 static ssize_t dpcm_show_state(struct snd_soc_pcm_runtime *fe,
                    int stream, char *buf, size_t size)
 {
     struct snd_pcm_hw_params *params = &fe->dpcm[stream].hw_params;
     struct snd_soc_dpcm *dpcm;
     ssize_t offset = 0;
 
     /* FE state */
     offset += scnprintf(buf + offset, size - offset,
                "[%s - %s]\n", fe->dai_link->name,
                stream ? "Capture" : "Playback");
 
     offset += scnprintf(buf + offset, size - offset, "State: %s\n",
                dpcm_state_string(fe->dpcm[stream].state));
 
     if ((fe->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
         (fe->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
         offset += scnprintf(buf + offset, size - offset,
                    "Hardware Params: "
                    "Format = %s, Channels = %d, Rate = %d\n",
                    snd_pcm_format_name(params_format(params)),
                    params_channels(params),
                    params_rate(params));
 
     /* BEs state */
     offset += scnprintf(buf + offset, size - offset, "Backends:\n");
 
     if (list_empty(&fe->dpcm[stream].be_clients)) {
         offset += scnprintf(buf + offset, size - offset,
                    " No active DSP links\n");
         goto out;
     }
 
     for_each_dpcm_be(fe, stream, dpcm) {
         struct snd_soc_pcm_runtime *be = dpcm->be;
         params = &dpcm->hw_params;
 
         offset += scnprintf(buf + offset, size - offset,
                    "- %s\n", be->dai_link->name);
 
         offset += scnprintf(buf + offset, size - offset,
                    "   State: %s\n",
                    dpcm_state_string(be->dpcm[stream].state));
 
         if ((be->dpcm[stream].state >= SND_SOC_DPCM_STATE_HW_PARAMS) &&
             (be->dpcm[stream].state <= SND_SOC_DPCM_STATE_STOP))
             offset += scnprintf(buf + offset, size - offset,
                        "   Hardware Params: "
                        "Format = %s, Channels = %d, Rate = %d\n",
                        snd_pcm_format_name(params_format(params)),
                        params_channels(params),
                        params_rate(params));
     }
 out:
     return offset;
 }
 
 static ssize_t dpcm_state_read_file(struct file *file, char __user *user_buf,
                     size_t count, loff_t *ppos)
 {
     struct snd_soc_pcm_runtime *fe = file->private_data;
     ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
     int stream;
     char *buf;
 
     if (fe->num_cpus > 1) {
         dev_err(fe->dev,
             "%s doesn't support Multi CPU yet\n", __func__);
         return -EINVAL;
     }
 
     buf = kmalloc(out_count, GFP_KERNEL);
     if (!buf)
         return -ENOMEM;
 
     snd_soc_dpcm_mutex_lock(fe);
     for_each_pcm_streams(stream)
         if (snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0), stream))
             offset += dpcm_show_state(fe, stream,
                           buf + offset,
                           out_count - offset);
     snd_soc_dpcm_mutex_unlock(fe);
 
     ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
 
     kfree(buf);
     return ret;
 }
 
 static const struct file_operations dpcm_state_fops = {
     .open = simple_open,
     .read = dpcm_state_read_file,
     .llseek = default_llseek,
 };
 
 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
 {
     if (!rtd->dai_link->dynamic)
         return;
 
     if (!rtd->card->debugfs_card_root)
         return;
 
     rtd->debugfs_dpcm_root = debugfs_create_dir(rtd->dai_link->name,
                             rtd->card->debugfs_card_root);
 
     debugfs_create_file("state", 0444, rtd->debugfs_dpcm_root,
                 rtd, &dpcm_state_fops);
 }
 
 static void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm, int stream)
 {
     char *name;
 
     name = kasprintf(GFP_KERNEL, "%s:%s", dpcm->be->dai_link->name,
              stream ? "capture" : "playback");
     if (name) {
         dpcm->debugfs_state = debugfs_create_dir(
             name, dpcm->fe->debugfs_dpcm_root);
         debugfs_create_u32("state", 0644, dpcm->debugfs_state,
                    &dpcm->state);
         kfree(name);
     }
 }
 
 static void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
 {
     debugfs_remove_recursive(dpcm->debugfs_state);
 }
 
 #else
 static inline void dpcm_create_debugfs_state(struct snd_soc_dpcm *dpcm,
                          int stream)
 {
 }
 
 static inline void dpcm_remove_debugfs_state(struct snd_soc_dpcm *dpcm)
 {
 }
 #endif
 
 /* Set FE's runtime_update state; the state is protected via PCM stream lock
  * for avoiding the race with trigger callback.
  * If the state is unset and a trigger is pending while the previous operation,
  * process the pending trigger action here.
  */
 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
 static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
                      int stream, enum snd_soc_dpcm_update state)
 {
     struct snd_pcm_substream *substream =
         snd_soc_dpcm_get_substream(fe, stream);
 
     snd_soc_dpcm_stream_lock_irq(fe, stream);
     if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
         dpcm_fe_dai_do_trigger(substream,
                        fe->dpcm[stream].trigger_pending - 1);
         fe->dpcm[stream].trigger_pending = 0;
     }
     fe->dpcm[stream].runtime_update = state;
     snd_soc_dpcm_stream_unlock_irq(fe, stream);
 }
 
 static void dpcm_set_be_update_state(struct snd_soc_pcm_runtime *be,
                      int stream, enum snd_soc_dpcm_update state)
 {
     be->dpcm[stream].runtime_update = state;
 }
 
 /**
  * snd_soc_runtime_action() - Increment/Decrement active count for
  * PCM runtime components
  * @rtd: ASoC PCM runtime that is activated
  * @stream: Direction of the PCM stream
  * @action: Activate stream if 1. Deactivate if -1.
  *
  * Increments/Decrements the active count for all the DAIs and components
  * attached to a PCM runtime.
  * Should typically be called when a stream is opened.
  *
  * Must be called with the rtd->card->pcm_mutex being held
  */
 void snd_soc_runtime_action(struct snd_soc_pcm_runtime *rtd,
                 int stream, int action)
 {
     struct snd_soc_dai *dai;
     int i;
 
     snd_soc_dpcm_mutex_assert_held(rtd);
 
     for_each_rtd_dais(rtd, i, dai)
         snd_soc_dai_action(dai, stream, action);
 }
 EXPORT_SYMBOL_GPL(snd_soc_runtime_action);
 
 /**
  * snd_soc_runtime_ignore_pmdown_time() - Check whether to ignore the power down delay
  * @rtd: The ASoC PCM runtime that should be checked.
  *
  * This function checks whether the power down delay should be ignored for a
  * specific PCM runtime. Returns true if the delay is 0, if it the DAI link has
  * been configured to ignore the delay, or if none of the components benefits
  * from having the delay.
  */
 bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd)
 {
     struct snd_soc_component *component;
     bool ignore = true;
     int i;
 
     if (!rtd->pmdown_time || rtd->dai_link->ignore_pmdown_time)
         return true;
 
     for_each_rtd_components(rtd, i, component)
         ignore &= !component->driver->use_pmdown_time;
 
     return ignore;
 }
 
 /**
  * snd_soc_set_runtime_hwparams - set the runtime hardware parameters
  * @substream: the pcm substream
  * @hw: the hardware parameters
  *
  * Sets the substream runtime hardware parameters.
  */
 int snd_soc_set_runtime_hwparams(struct snd_pcm_substream *substream,
     const struct snd_pcm_hardware *hw)
 {
     substream->runtime->hw = *hw;
 
     return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_set_runtime_hwparams);
 
 /* DPCM stream event, send event to FE and all active BEs. */
 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
     int event)
 {
     struct snd_soc_dpcm *dpcm;
 
     snd_soc_dpcm_mutex_assert_held(fe);
 
     for_each_dpcm_be(fe, dir, dpcm) {
 
         struct snd_soc_pcm_runtime *be = dpcm->be;
 
         dev_dbg(be->dev, "ASoC: BE %s event %d dir %d\n",
                 be->dai_link->name, event, dir);
 
         if ((event == SND_SOC_DAPM_STREAM_STOP) &&
             (be->dpcm[dir].users >= 1))
             continue;
 
         snd_soc_dapm_stream_event(be, dir, event);
     }
 
     snd_soc_dapm_stream_event(fe, dir, event);
 
     return 0;
 }
 
 static void soc_pcm_set_dai_params(struct snd_soc_dai *dai,
                    struct snd_pcm_hw_params *params)
 {
     if (params) {
         dai->rate    = params_rate(params);
         dai->channels    = params_channels(params);
         dai->sample_bits = snd_pcm_format_physical_width(params_format(params));
     } else {
         dai->rate    = 0;
         dai->channels    = 0;
         dai->sample_bits = 0;
     }
 }
 
 static int soc_pcm_apply_symmetry(struct snd_pcm_substream *substream,
                     struct snd_soc_dai *soc_dai)
 {
     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
     int ret;
 
     if (!snd_soc_dai_active(soc_dai))
         return 0;
 
 #define __soc_pcm_apply_symmetry(name, NAME)                \
     if (soc_dai->name && (soc_dai->driver->symmetric_##name ||  \
                   rtd->dai_link->symmetric_##name)) {   \
         dev_dbg(soc_dai->dev, "ASoC: Symmetry forces %s to %d\n",\
             #name, soc_dai->name);              \
                                     \
         ret = snd_pcm_hw_constraint_single(substream->runtime,  \
                            SNDRV_PCM_HW_PARAM_##NAME,\
                            soc_dai->name);  \
         if (ret < 0) {                      \
             dev_err(soc_dai->dev,               \
                 "ASoC: Unable to apply %s constraint: %d\n",\
                 #name, ret);                \
             return ret;                 \
         }                           \
     }
 
     __soc_pcm_apply_symmetry(rate,      RATE);
     __soc_pcm_apply_symmetry(channels,  CHANNELS);
     __soc_pcm_apply_symmetry(sample_bits,   SAMPLE_BITS);
 
     return 0;
 }
 
 static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
                 struct snd_pcm_hw_params *params)
 {
     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
     struct snd_soc_dai d;
     struct snd_soc_dai *dai;
     struct snd_soc_dai *cpu_dai;
     unsigned int symmetry, i;
 
     d.name = __func__;
     soc_pcm_set_dai_params(&d, params);
 
 #define __soc_pcm_params_symmetry(xxx)                  \
     symmetry = rtd->dai_link->symmetric_##xxx;          \
     for_each_rtd_dais(rtd, i, dai)                  \
         symmetry |= dai->driver->symmetric_##xxx;       \
                                     \
     if (symmetry)                           \
         for_each_rtd_cpu_dais(rtd, i, cpu_dai)          \
             if (!snd_soc_dai_is_dummy(cpu_dai) &&       \
                 cpu_dai->xxx && cpu_dai->xxx != d.xxx) {    \
                 dev_err(rtd->dev, "ASoC: unmatched %s symmetry: %s:%d - %s:%d\n", \
                     #xxx, cpu_dai->name, cpu_dai->xxx, d.name, d.xxx); \
                 return -EINVAL;             \
             }
 
     /* reject unmatched parameters when applying symmetry */
     __soc_pcm_params_symmetry(rate);
     __soc_pcm_params_symmetry(channels);
     __soc_pcm_params_symmetry(sample_bits);
 
     return 0;
 }
 
 static void soc_pcm_update_symmetry(struct snd_pcm_substream *substream)
 {
     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
     struct snd_soc_dai_link *link = rtd->dai_link;
     struct snd_soc_dai *dai;
     unsigned int symmetry, i;
 
     symmetry = link->symmetric_rate ||
         link->symmetric_channels ||
         link->symmetric_sample_bits;
 
     for_each_rtd_dais(rtd, i, dai)
         symmetry = symmetry ||
             dai->driver->symmetric_rate ||
             dai->driver->symmetric_channels ||
             dai->driver->symmetric_sample_bits;
 
     if (symmetry)
         substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
 }
 
 static void soc_pcm_set_msb(struct snd_pcm_substream *substream, int bits)
 {
     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
     int ret;
 
     if (!bits)
         return;
 
     ret = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 0, bits);
     if (ret != 0)
         dev_warn(rtd->dev, "ASoC: Failed to set MSB %d: %d\n",
                  bits, ret);
 }
 
 static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
 {
     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
     struct snd_soc_dai *cpu_dai;
     struct snd_soc_dai *codec_dai;
     int stream = substream->stream;
     int i;
     unsigned int bits = 0, cpu_bits = 0;
 
     for_each_rtd_codec_dais(rtd, i, codec_dai) {
         struct snd_soc_pcm_stream *pcm_codec = snd_soc_dai_get_pcm_stream(codec_dai, stream);
 
         if (pcm_codec->sig_bits == 0) {
             bits = 0;
             break;
         }
         bits = max(pcm_codec->sig_bits, bits);
     }
 
     for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
         struct snd_soc_pcm_stream *pcm_cpu = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
 
         if (pcm_cpu->sig_bits == 0) {
             cpu_bits = 0;
             break;
         }
         cpu_bits = max(pcm_cpu->sig_bits, cpu_bits);
     }
 
     soc_pcm_set_msb(substream, bits);
     soc_pcm_set_msb(substream, cpu_bits);
 }
 
 static void soc_pcm_hw_init(struct snd_pcm_hardware *hw)
 {
     hw->rates       = UINT_MAX;
     hw->rate_min        = 0;
     hw->rate_max        = UINT_MAX;
     hw->channels_min    = 0;
     hw->channels_max    = UINT_MAX;
     hw->formats     = ULLONG_MAX;
 }
 
 static void soc_pcm_hw_update_rate(struct snd_pcm_hardware *hw,
                    struct snd_soc_pcm_stream *p)
 {
     hw->rates = snd_pcm_rate_mask_intersect(hw->rates, p->rates);
 
     /* setup hw->rate_min/max via hw->rates first */
     snd_pcm_hw_limit_rates(hw);
 
     /* update hw->rate_min/max by snd_soc_pcm_stream */
     hw->rate_min = max(hw->rate_min, p->rate_min);
     hw->rate_max = min_not_zero(hw->rate_max, p->rate_max);
 }
 
 static void soc_pcm_hw_update_chan(struct snd_pcm_hardware *hw,
                    struct snd_soc_pcm_stream *p)
 {
     hw->channels_min = max(hw->channels_min, p->channels_min);
     hw->channels_max = min(hw->channels_max, p->channels_max);
 }
 
 static void soc_pcm_hw_update_format(struct snd_pcm_hardware *hw,
                      struct snd_soc_pcm_stream *p)
 {
     hw->formats &= p->formats;
 }
 
 /**
  * snd_soc_runtime_calc_hw() - Calculate hw limits for a PCM stream
  * @rtd: ASoC PCM runtime
  * @hw: PCM hardware parameters (output)
  * @stream: Direction of the PCM stream
  *
  * Calculates the subset of stream parameters supported by all DAIs
  * associated with the PCM stream.
  */
 int snd_soc_runtime_calc_hw(struct snd_soc_pcm_runtime *rtd,
                 struct snd_pcm_hardware *hw, int stream)
 {
     struct snd_soc_dai *codec_dai;
     struct snd_soc_dai *cpu_dai;
     struct snd_soc_pcm_stream *codec_stream;
     struct snd_soc_pcm_stream *cpu_stream;
     unsigned int cpu_chan_min = 0, cpu_chan_max = UINT_MAX;
     int i;
 
     soc_pcm_hw_init(hw);
 
     /* first calculate min/max only for CPUs in the DAI link */
     for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
 
         /*
          * Skip CPUs which don't support the current stream type.
          * Otherwise, since the rate, channel, and format values will
          * zero in that case, we would have no usable settings left,
          * causing the resulting setup to fail.
          */
         if (!snd_soc_dai_stream_valid(cpu_dai, stream))
             continue;
 
         cpu_stream = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
 
         soc_pcm_hw_update_chan(hw, cpu_stream);
         soc_pcm_hw_update_rate(hw, cpu_stream);
         soc_pcm_hw_update_format(hw, cpu_stream);
     }
     cpu_chan_min = hw->channels_min;
     cpu_chan_max = hw->channels_max;
 
     /* second calculate min/max only for CODECs in the DAI link */
     for_each_rtd_codec_dais(rtd, i, codec_dai) {
 
         /*
          * Skip CODECs which don't support the current stream type.
          * Otherwise, since the rate, channel, and format values will
          * zero in that case, we would have no usable settings left,
          * causing the resulting setup to fail.
          */
         if (!snd_soc_dai_stream_valid(codec_dai, stream))
             continue;
 
         codec_stream = snd_soc_dai_get_pcm_stream(codec_dai, stream);
 
         soc_pcm_hw_update_chan(hw, codec_stream);
         soc_pcm_hw_update_rate(hw, codec_stream);
         soc_pcm_hw_update_format(hw, codec_stream);
     }
 
     /* Verify both a valid CPU DAI and a valid CODEC DAI were found */
     if (!hw->channels_min)
         return -EINVAL;
 
     /*
      * chan min/max cannot be enforced if there are multiple CODEC DAIs
      * connected to CPU DAI(s), use CPU DAI's directly and let
      * channel allocation be fixed up later
      */
     if (rtd->num_codecs > 1) {
         hw->channels_min = cpu_chan_min;
         hw->channels_max = cpu_chan_max;
     }
 
     return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_runtime_calc_hw);
 
 static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
 {
     struct snd_pcm_hardware *hw = &substream->runtime->hw;
     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
     u64 formats = hw->formats;
 
     /*
      * At least one CPU and one CODEC should match. Otherwise, we should
      * have bailed out on a higher level, since there would be no CPU or
      * CODEC to support the transfer direction in that case.
      */
     snd_soc_runtime_calc_hw(rtd, hw, substream->stream);
 
     if (formats)
         hw->formats &= formats;
 }
 
 static int soc_pcm_components_open(struct snd_pcm_substream *substream)
 {
     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
     struct snd_soc_component *component;
     int i, ret = 0;
 
     for_each_rtd_components(rtd, i, component) {
         ret = snd_soc_component_module_get_when_open(component, substream);
         if (ret < 0)
             break;
 
         ret = snd_soc_component_open(component, substream);
         if (ret < 0)
             break;
     }
 
     return ret;
 }
 
 static int soc_pcm_components_close(struct snd_pcm_substream *substream,
                     int rollback)
 {
     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
     struct snd_soc_component *component;
     int i, ret = 0;
 
     for_each_rtd_components(rtd, i, component) {
         int r = snd_soc_component_close(component, substream, rollback);
         if (r < 0)
             ret = r; /* use last ret */
 
         snd_soc_component_module_put_when_close(component, substream, rollback);
     }
 
     return ret;
 }
 
 static int soc_pcm_clean(struct snd_soc_pcm_runtime *rtd,
              struct snd_pcm_substream *substream, int rollback)
 {
     struct snd_soc_component *component;
     struct snd_soc_dai *dai;
     int i;
 
     snd_soc_dpcm_mutex_assert_held(rtd);
 
     if (!rollback)
         snd_soc_runtime_deactivate(rtd, substream->stream);
 
     for_each_rtd_dais(rtd, i, dai)
         snd_soc_dai_shutdown(dai, substream, rollback);
 
     snd_soc_link_shutdown(substream, rollback);
 
     soc_pcm_components_close(substream, rollback);
 
     snd_soc_pcm_component_pm_runtime_put(rtd, substream, rollback);
 
     for_each_rtd_components(rtd, i, component)
         if (!snd_soc_component_active(component))
             pinctrl_pm_select_sleep_state(component->dev);
 
     return 0;
 }
 
 /*
  * Called by ALSA when a PCM substream is closed. Private data can be
  * freed here. The cpu DAI, codec DAI, machine and components are also
  * shutdown.
  */
 static int __soc_pcm_close(struct snd_soc_pcm_runtime *rtd,
                struct snd_pcm_substream *substream)
 {
     return soc_pcm_clean(rtd, substream, 0);
 }
 
 /* PCM close ops for non-DPCM streams */
 static int soc_pcm_close(struct snd_pcm_substream *substream)
 {
     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 
     snd_soc_dpcm_mutex_lock(rtd);
     soc_pcm_clean(rtd, substream, 0);
     snd_soc_dpcm_mutex_unlock(rtd);
     return 0;
 }
 
 static int soc_hw_sanity_check(struct snd_pcm_substream *substream)
 {
     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
     struct snd_pcm_hardware *hw = &substream->runtime->hw;
     const char *name_cpu = soc_cpu_dai_name(rtd);
     const char *name_codec = soc_codec_dai_name(rtd);
     const char *err_msg;
     struct device *dev = rtd->dev;
 
     err_msg = "rates";
     if (!hw->rates)
         goto config_err;
 
     err_msg = "formats";
     if (!hw->formats)
         goto config_err;
 
     err_msg = "channels";
     if (!hw->channels_min || !hw->channels_max ||
          hw->channels_min  >  hw->channels_max)
         goto config_err;
 
     dev_dbg(dev, "ASoC: %s <-> %s info:\n",     name_codec,
                             name_cpu);
     dev_dbg(dev, "ASoC: rate mask 0x%x\n",      hw->rates);
     dev_dbg(dev, "ASoC: ch   min %d max %d\n",  hw->channels_min,
                             hw->channels_max);
     dev_dbg(dev, "ASoC: rate min %d max %d\n",  hw->rate_min,
                             hw->rate_max);
 
     return 0;
 
 config_err:
     dev_err(dev, "ASoC: %s <-> %s No matching %s\n",
         name_codec, name_cpu, err_msg);
     return -EINVAL;
 }
 
 /*
  * 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, component, machine and codec DAI.
  */
 static int __soc_pcm_open(struct snd_soc_pcm_runtime *rtd,
               struct snd_pcm_substream *substream)
 {
     struct snd_soc_component *component;
     struct snd_soc_dai *dai;
     int i, ret = 0;
 
     snd_soc_dpcm_mutex_assert_held(rtd);
 
     for_each_rtd_components(rtd, i, component)
         pinctrl_pm_select_default_state(component->dev);
 
     ret = snd_soc_pcm_component_pm_runtime_get(rtd, substream);
     if (ret < 0)
         goto err;
 
     ret = soc_pcm_components_open(substream);
     if (ret < 0)
         goto err;
 
     ret = snd_soc_link_startup(substream);
     if (ret < 0)
         goto err;
 
     /* startup the audio subsystem */
     for_each_rtd_dais(rtd, i, dai) {
         ret = snd_soc_dai_startup(dai, substream);
         if (ret < 0)
             goto err;
 
         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
             dai->tx_mask = 0;
         else
             dai->rx_mask = 0;
     }
 
     /* Dynamic PCM DAI links compat checks use dynamic capabilities */
     if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm)
         goto dynamic;
 
     /* Check that the codec and cpu DAIs are compatible */
     soc_pcm_init_runtime_hw(substream);
 
     soc_pcm_update_symmetry(substream);
 
     ret = soc_hw_sanity_check(substream);
     if (ret < 0)
         goto err;
 
     soc_pcm_apply_msb(substream);
 
     /* Symmetry only applies if we've already got an active stream. */
     for_each_rtd_dais(rtd, i, dai) {
         ret = soc_pcm_apply_symmetry(substream, dai);
         if (ret != 0)
             goto err;
     }
 dynamic:
     snd_soc_runtime_activate(rtd, substream->stream);
     ret = 0;
 err:
     if (ret < 0) {
         soc_pcm_clean(rtd, substream, 1);
         dev_err(rtd->dev, "%s() failed (%d)", __func__, ret);
     }
 
     return ret;
 }
 
 /* PCM open ops for non-DPCM streams */
 static int soc_pcm_open(struct snd_pcm_substream *substream)
 {
     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
     int ret;
 
     snd_soc_dpcm_mutex_lock(rtd);
     ret = __soc_pcm_open(rtd, substream);
     snd_soc_dpcm_mutex_unlock(rtd);
     return ret;
 }
 
 static void codec2codec_close_delayed_work(struct snd_soc_pcm_runtime *rtd)
 {
     /*
      * Currently nothing to do for c2c links
      * Since c2c links are internal nodes in the DAPM graph and
      * don't interface with the outside world or application layer
      * we don't have to do any special handling on close.
      */
 }
 
 /*
  * 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_soc_pcm_runtime *rtd,
                  struct snd_pcm_substream *substream)
 {
     struct snd_soc_dai *dai;
     int i, ret = 0;
 
     snd_soc_dpcm_mutex_assert_held(rtd);
 
     ret = snd_soc_link_prepare(substream);
     if (ret < 0)
         goto out;
 
     ret = snd_soc_pcm_component_prepare(substream);
     if (ret < 0)
         goto out;
 
     ret = snd_soc_pcm_dai_prepare(substream);
     if (ret < 0)
         goto out;
 
     /* cancel any delayed stream shutdown that is pending */
     if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
         rtd->pop_wait) {
         rtd->pop_wait = 0;
         cancel_delayed_work(&rtd->delayed_work);
     }
 
     snd_soc_dapm_stream_event(rtd, substream->stream,
             SND_SOC_DAPM_STREAM_START);
 
     for_each_rtd_dais(rtd, i, dai)
         snd_soc_dai_digital_mute(dai, 0, substream->stream);
 
 out:
     if (ret < 0)
         dev_err(rtd->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
 
     return ret;
 }
 
 /* PCM prepare ops for non-DPCM streams */
 static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 {
     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
     int ret;
 
     snd_soc_dpcm_mutex_lock(rtd);
     ret = __soc_pcm_prepare(rtd, substream);
     snd_soc_dpcm_mutex_unlock(rtd);
     return ret;
 }
 
 static void soc_pcm_codec_params_fixup(struct snd_pcm_hw_params *params,
                        unsigned int mask)
 {
     struct snd_interval *interval;
     int channels = hweight_long(mask);
 
     interval = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
     interval->min = channels;
     interval->max = channels;
 }
 
 static int soc_pcm_hw_clean(struct snd_soc_pcm_runtime *rtd,
                 struct snd_pcm_substream *substream, int rollback)
 {
     struct snd_soc_dai *dai;
     int i;
 
     snd_soc_dpcm_mutex_assert_held(rtd);
 
     /* clear the corresponding DAIs parameters when going to be inactive */
     for_each_rtd_dais(rtd, i, dai) {
         if (snd_soc_dai_active(dai) == 1)
             soc_pcm_set_dai_params(dai, NULL);
 
         if (snd_soc_dai_stream_active(dai, substream->stream) == 1)
             snd_soc_dai_digital_mute(dai, 1, substream->stream);
     }
 
     /* run the stream event */
     snd_soc_dapm_stream_stop(rtd, substream->stream);
 
     /* free any machine hw params */
     snd_soc_link_hw_free(substream, rollback);
 
     /* free any component resources */
     snd_soc_pcm_component_hw_free(substream, rollback);
 
     /* now free hw params for the DAIs  */
     for_each_rtd_dais(rtd, i, dai)
         if (snd_soc_dai_stream_valid(dai, substream->stream))
             snd_soc_dai_hw_free(dai, substream, rollback);
 
     return 0;
 }
 
 /*
  * Frees resources allocated by hw_params, can be called multiple times
  */
 static int __soc_pcm_hw_free(struct snd_soc_pcm_runtime *rtd,
                  struct snd_pcm_substream *substream)
 {
     return soc_pcm_hw_clean(rtd, substream, 0);
 }
 
 /* hw_free PCM ops for non-DPCM streams */
 static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 {
     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
     int ret;
 
     snd_soc_dpcm_mutex_lock(rtd);
     ret = __soc_pcm_hw_free(rtd, substream);
     snd_soc_dpcm_mutex_unlock(rtd);
     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_soc_pcm_runtime *rtd,
                    struct snd_pcm_substream *substream,
                    struct snd_pcm_hw_params *params)
 {
     struct snd_soc_dai *cpu_dai;
     struct snd_soc_dai *codec_dai;
     int i, ret = 0;
 
     snd_soc_dpcm_mutex_assert_held(rtd);
 
     ret = soc_pcm_params_symmetry(substream, params);
     if (ret)
         goto out;
 
     ret = snd_soc_link_hw_params(substream, params);
     if (ret < 0)
         goto out;
 
     for_each_rtd_codec_dais(rtd, i, codec_dai) {
         struct snd_pcm_hw_params codec_params;
 
         /*
          * Skip CODECs which don't support the current stream type,
          * the idea being that if a CODEC is not used for the currently
          * set up transfer direction, it should not need to be
          * configured, especially since the configuration used might
          * not even be supported by that CODEC. There may be cases
          * however where a CODEC needs to be set up although it is
          * actually not being used for the transfer, e.g. if a
          * capture-only CODEC is acting as an LRCLK and/or BCLK master
          * for the DAI link including a playback-only CODEC.
          * If this becomes necessary, we will have to augment the
          * machine driver setup with information on how to act, so
          * we can do the right thing here.
          */
         if (!snd_soc_dai_stream_valid(codec_dai, substream->stream))
             continue;
 
         /* copy params for each codec */
         codec_params = *params;
 
         /* fixup params based on TDM slot masks */
         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
             codec_dai->tx_mask)
             soc_pcm_codec_params_fixup(&codec_params,
                            codec_dai->tx_mask);
 
         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE &&
             codec_dai->rx_mask)
             soc_pcm_codec_params_fixup(&codec_params,
                            codec_dai->rx_mask);
 
         ret = snd_soc_dai_hw_params(codec_dai, substream,
                         &codec_params);
         if(ret < 0)
             goto out;
 
         soc_pcm_set_dai_params(codec_dai, &codec_params);
         snd_soc_dapm_update_dai(substream, &codec_params, codec_dai);
     }
 
     for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
         /*
          * Skip CPUs which don't support the current stream
          * type. See soc_pcm_init_runtime_hw() for more details
          */
         if (!snd_soc_dai_stream_valid(cpu_dai, substream->stream))
             continue;
 
         ret = snd_soc_dai_hw_params(cpu_dai, substream, params);
         if (ret < 0)
             goto out;
 
         /* store the parameters for each DAI */
         soc_pcm_set_dai_params(cpu_dai, params);
         snd_soc_dapm_update_dai(substream, params, cpu_dai);
     }
 
     ret = snd_soc_pcm_component_hw_params(substream, params);
 out:
     if (ret < 0) {
         soc_pcm_hw_clean(rtd, substream, 1);
         dev_err(rtd->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
     }
 
     return ret;
 }
 
 /* hw_params PCM ops for non-DPCM streams */
 static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
                  struct snd_pcm_hw_params *params)
 {
     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
     int ret;
 
     snd_soc_dpcm_mutex_lock(rtd);
     ret = __soc_pcm_hw_params(rtd, substream, params);
     snd_soc_dpcm_mutex_unlock(rtd);
     return ret;
 }
 
 static int soc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 {
     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
     int ret = -EINVAL, _ret = 0;
     int rollback = 0;
 
     switch (cmd) {
     case SNDRV_PCM_TRIGGER_START:
     case SNDRV_PCM_TRIGGER_RESUME:
     case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
         ret = snd_soc_link_trigger(substream, cmd, 0);
         if (ret < 0)
             goto start_err;
 
         ret = snd_soc_pcm_component_trigger(substream, cmd, 0);
         if (ret < 0)
             goto start_err;
 
         ret = snd_soc_pcm_dai_trigger(substream, cmd, 0);
 start_err:
         if (ret < 0)
             rollback = 1;
     }
 
     if (rollback) {
         _ret = ret;
         switch (cmd) {
         case SNDRV_PCM_TRIGGER_START:
             cmd = SNDRV_PCM_TRIGGER_STOP;
             break;
         case SNDRV_PCM_TRIGGER_RESUME:
             cmd = SNDRV_PCM_TRIGGER_SUSPEND;
             break;
         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
             cmd = SNDRV_PCM_TRIGGER_PAUSE_PUSH;
             break;
         }
     }
 
     switch (cmd) {
     case SNDRV_PCM_TRIGGER_STOP:
     case SNDRV_PCM_TRIGGER_SUSPEND:
     case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
         if (rtd->dai_link->stop_dma_first) {
             ret = snd_soc_pcm_component_trigger(substream, cmd, rollback);
             if (ret < 0)
                 break;
 
             ret = snd_soc_pcm_dai_trigger(substream, cmd, rollback);
             if (ret < 0)
                 break;
         } else {
             ret = snd_soc_pcm_dai_trigger(substream, cmd, rollback);
             if (ret < 0)
                 break;
 
             ret = snd_soc_pcm_component_trigger(substream, cmd, rollback);
             if (ret < 0)
                 break;
         }
         ret = snd_soc_link_trigger(substream, cmd, rollback);
         break;
     }
 
     if (_ret)
         ret = _ret;
 
     return ret;
 }
 
 /*
  * soc level wrapper for pointer callback
  * If cpu_dai, codec_dai, component driver has the delay callback, then
  * the runtime->delay will be updated via snd_soc_pcm_component/dai_delay().
  */
 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
 {
     struct snd_pcm_runtime *runtime = substream->runtime;
     snd_pcm_uframes_t offset = 0;
     snd_pcm_sframes_t codec_delay = 0;
     snd_pcm_sframes_t cpu_delay = 0;
 
     offset = snd_soc_pcm_component_pointer(substream);
 
     /* should be called *after* snd_soc_pcm_component_pointer() */
     snd_soc_pcm_dai_delay(substream, &cpu_delay, &codec_delay);
     snd_soc_pcm_component_delay(substream, &cpu_delay, &codec_delay);
 
     runtime->delay = cpu_delay + codec_delay;
 
     return offset;
 }
 
 /* connect a FE and BE */
 static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
         struct snd_soc_pcm_runtime *be, int stream)
 {
     struct snd_pcm_substream *fe_substream;
     struct snd_pcm_substream *be_substream;
     struct snd_soc_dpcm *dpcm;
 
     snd_soc_dpcm_mutex_assert_held(fe);
 
     /* only add new dpcms */
     for_each_dpcm_be(fe, stream, dpcm) {
         if (dpcm->be == be && dpcm->fe == fe)
             return 0;
     }
 
     fe_substream = snd_soc_dpcm_get_substream(fe, stream);
     be_substream = snd_soc_dpcm_get_substream(be, stream);
 
     if (!fe_substream->pcm->nonatomic && be_substream->pcm->nonatomic) {
         dev_err(be->dev, "%s: FE is atomic but BE is nonatomic, invalid configuration\n",
             __func__);
         return -EINVAL;
     }
     if (fe_substream->pcm->nonatomic && !be_substream->pcm->nonatomic) {
         dev_dbg(be->dev, "FE is nonatomic but BE is not, forcing BE as nonatomic\n");
         be_substream->pcm->nonatomic = 1;
     }
 
     dpcm = kzalloc(sizeof(struct snd_soc_dpcm), GFP_KERNEL);
     if (!dpcm)
         return -ENOMEM;
 
     dpcm->be = be;
     dpcm->fe = fe;
     be->dpcm[stream].runtime = fe->dpcm[stream].runtime;
     dpcm->state = SND_SOC_DPCM_LINK_STATE_NEW;
     snd_soc_dpcm_stream_lock_irq(fe, stream);
     list_add(&dpcm->list_be, &fe->dpcm[stream].be_clients);
     list_add(&dpcm->list_fe, &be->dpcm[stream].fe_clients);
     snd_soc_dpcm_stream_unlock_irq(fe, stream);
 
     dev_dbg(fe->dev, "connected new DPCM %s path %s %s %s\n",
             stream ? "capture" : "playback",  fe->dai_link->name,
             stream ? "<-" : "->", be->dai_link->name);
 
     dpcm_create_debugfs_state(dpcm, stream);
 
     return 1;
 }
 
 /* reparent a BE onto another FE */
 static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
             struct snd_soc_pcm_runtime *be, int stream)
 {
     struct snd_soc_dpcm *dpcm;
     struct snd_pcm_substream *fe_substream, *be_substream;
 
     /* reparent if BE is connected to other FEs */
     if (!be->dpcm[stream].users)
         return;
 
     be_substream = snd_soc_dpcm_get_substream(be, stream);
 
     for_each_dpcm_fe(be, stream, dpcm) {
         if (dpcm->fe == fe)
             continue;
 
         dev_dbg(fe->dev, "reparent %s path %s %s %s\n",
             stream ? "capture" : "playback",
             dpcm->fe->dai_link->name,
             stream ? "<-" : "->", dpcm->be->dai_link->name);
 
         fe_substream = snd_soc_dpcm_get_substream(dpcm->fe, stream);
         be_substream->runtime = fe_substream->runtime;
         break;
     }
 }
 
 /* disconnect a BE and FE */
 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
 {
     struct snd_soc_dpcm *dpcm, *d;
     LIST_HEAD(deleted_dpcms);
 
     snd_soc_dpcm_mutex_assert_held(fe);
 
     snd_soc_dpcm_stream_lock_irq(fe, stream);
     for_each_dpcm_be_safe(fe, stream, dpcm, d) {
         dev_dbg(fe->dev, "ASoC: BE %s disconnect check for %s\n",
                 stream ? "capture" : "playback",
                 dpcm->be->dai_link->name);
 
         if (dpcm->state != SND_SOC_DPCM_LINK_STATE_FREE)
             continue;
 
         dev_dbg(fe->dev, "freed DSP %s path %s %s %s\n",
             stream ? "capture" : "playback", fe->dai_link->name,
             stream ? "<-" : "->", dpcm->be->dai_link->name);
 
         /* BEs still alive need new FE */
         dpcm_be_reparent(fe, dpcm->be, stream);
 
         list_del(&dpcm->list_be);
         list_move(&dpcm->list_fe, &deleted_dpcms);
     }
     snd_soc_dpcm_stream_unlock_irq(fe, stream);
 
     while (!list_empty(&deleted_dpcms)) {
         dpcm = list_first_entry(&deleted_dpcms, struct snd_soc_dpcm,
                     list_fe);
         list_del(&dpcm->list_fe);
         dpcm_remove_debugfs_state(dpcm);
         kfree(dpcm);
     }
 }
 
 /* get BE for DAI widget and stream */
 static struct snd_soc_pcm_runtime *dpcm_get_be(struct snd_soc_card *card,
         struct snd_soc_dapm_widget *widget, int stream)
 {
     struct snd_soc_pcm_runtime *be;
     struct snd_soc_dapm_widget *w;
     struct snd_soc_dai *dai;
     int i;
 
     dev_dbg(card->dev, "ASoC: find BE for widget %s\n", widget->name);
 
     for_each_card_rtds(card, be) {
 
         if (!be->dai_link->no_pcm)
             continue;
 
         if (!snd_soc_dpcm_get_substream(be, stream))
             continue;
 
         for_each_rtd_dais(be, i, dai) {
             w = snd_soc_dai_get_widget(dai, stream);
 
             dev_dbg(card->dev, "ASoC: try BE : %s\n",
                 w ? w->name : "(not set)");
 
             if (w == widget)
                 return be;
         }
     }
 
     /* Widget provided is not a BE */
     return NULL;
 }
 
 static int widget_in_list(struct snd_soc_dapm_widget_list *list,
         struct snd_soc_dapm_widget *widget)
 {
     struct snd_soc_dapm_widget *w;
     int i;
 
     for_each_dapm_widgets(list, i, w)
         if (widget == w)
             return 1;
 
     return 0;
 }
 
 bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget, enum snd_soc_dapm_direction dir)
 {
     struct snd_soc_card *card = widget->dapm->card;
     struct snd_soc_pcm_runtime *rtd;
     int stream;
 
     /* adjust dir to stream */
     if (dir == SND_SOC_DAPM_DIR_OUT)
         stream = SNDRV_PCM_STREAM_PLAYBACK;
     else
         stream = SNDRV_PCM_STREAM_CAPTURE;
 
     rtd = dpcm_get_be(card, widget, stream);
     if (rtd)
         return true;
 
     return false;
 }
 EXPORT_SYMBOL_GPL(dpcm_end_walk_at_be);
 
 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
     int stream, struct snd_soc_dapm_widget_list **list)
 {
     struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(fe, 0);
     int paths;
 
     if (fe->num_cpus > 1) {
         dev_err(fe->dev,
             "%s doesn't support Multi CPU yet\n", __func__);
         return -EINVAL;
     }
 
     /* get number of valid DAI paths and their widgets */
     paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
             fe->card->component_chaining ?
                 NULL : dpcm_end_walk_at_be);
 
     if (paths > 0)
         dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
             stream ? "capture" : "playback");
     else if (paths == 0)
         dev_dbg(fe->dev, "ASoC: %s no valid %s path\n", fe->dai_link->name,
              stream ? "capture" : "playback");
 
     return paths;
 }
 
 void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
 {
     snd_soc_dapm_dai_free_widgets(list);
 }
 
 static bool dpcm_be_is_active(struct snd_soc_dpcm *dpcm, int stream,
                   struct snd_soc_dapm_widget_list *list)
 {
     struct snd_soc_dai *dai;
     unsigned int i;
 
     /* is there a valid DAI widget for this BE */
     for_each_rtd_dais(dpcm->be, i, dai) {
         struct snd_soc_dapm_widget *widget = snd_soc_dai_get_widget(dai, stream);
 
         /*
          * The BE is pruned only if none of the dai
          * widgets are in the active list.
          */
         if (widget && widget_in_list(list, widget))
             return true;
     }
 
     return false;
 }
 
 static int dpcm_prune_paths(struct snd_soc_pcm_runtime *fe, int stream,
                 struct snd_soc_dapm_widget_list **list_)
 {
     struct snd_soc_dpcm *dpcm;
     int prune = 0;
 
     /* Destroy any old FE <--> BE connections */
     for_each_dpcm_be(fe, stream, dpcm) {
         if (dpcm_be_is_active(dpcm, stream, *list_))
             continue;
 
         dev_dbg(fe->dev, "ASoC: pruning %s BE %s for %s\n",
             stream ? "capture" : "playback",
             dpcm->be->dai_link->name, fe->dai_link->name);
         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
         dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_BE);
         prune++;
     }
 
     dev_dbg(fe->dev, "ASoC: found %d old BE paths for pruning\n", prune);
     return prune;
 }
 
 static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
     struct snd_soc_dapm_widget_list **list_)
 {
     struct snd_soc_card *card = fe->card;
     struct snd_soc_dapm_widget_list *list = *list_;
     struct snd_soc_pcm_runtime *be;
     struct snd_soc_dapm_widget *widget;
     int i, new = 0, err;
 
     /* Create any new FE <--> BE connections */
     for_each_dapm_widgets(list, i, widget) {
 
         switch (widget->id) {
         case snd_soc_dapm_dai_in:
             if (stream != SNDRV_PCM_STREAM_PLAYBACK)
                 continue;
             break;
         case snd_soc_dapm_dai_out:
             if (stream != SNDRV_PCM_STREAM_CAPTURE)
                 continue;
             break;
         default:
             continue;
         }
 
         /* is there a valid BE rtd for this widget */
         be = dpcm_get_be(card, widget, stream);
         if (!be) {
             dev_dbg(fe->dev, "ASoC: no BE found for %s\n",
                 widget->name);
             continue;
         }
 
         /* don't connect if FE is not running */
         if (!fe->dpcm[stream].runtime && !fe->fe_compr)
             continue;
 
         /*
          * Filter for systems with 'component_chaining' enabled.
          * This helps to avoid unnecessary re-configuration of an
          * already active BE on such systems.
          */
         if (fe->card->component_chaining &&
             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
             continue;
 
         /* newly connected FE and BE */
         err = dpcm_be_connect(fe, be, stream);
         if (err < 0) {
             dev_err(fe->dev, "ASoC: can't connect %s\n",
                 widget->name);
             break;
         } else if (err == 0) /* already connected */
             continue;
 
         /* new */
         dpcm_set_be_update_state(be, stream, SND_SOC_DPCM_UPDATE_BE);
         new++;
     }
 
     dev_dbg(fe->dev, "ASoC: found %d new BE paths\n", new);
     return new;
 }
 
 /*
  * Find the corresponding BE DAIs that source or sink audio to this
  * FE substream.
  */
 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
     int stream, struct snd_soc_dapm_widget_list **list, int new)
 {
     if (new)
         return dpcm_add_paths(fe, stream, list);
     else
         return dpcm_prune_paths(fe, stream, list);
 }
 
 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream)
 {
     struct snd_soc_dpcm *dpcm;
 
     for_each_dpcm_be(fe, stream, dpcm)
         dpcm_set_be_update_state(dpcm->be, stream, SND_SOC_DPCM_UPDATE_NO);
 }
 
 void dpcm_be_dai_stop(struct snd_soc_pcm_runtime *fe, int stream,
               int do_hw_free, struct snd_soc_dpcm *last)
 {
     struct snd_soc_dpcm *dpcm;
 
     /* disable any enabled and non active backends */
     for_each_dpcm_be(fe, stream, dpcm) {
         struct snd_soc_pcm_runtime *be = dpcm->be;
         struct snd_pcm_substream *be_substream =
             snd_soc_dpcm_get_substream(be, stream);
 
         if (dpcm == last)
             return;
 
         /* is this op for this BE ? */
         if (!snd_soc_dpcm_be_can_update(fe, be, stream))
             continue;
 
         if (be->dpcm[stream].users == 0) {
             dev_err(be->dev, "ASoC: no users %s at close - state %d\n",
                 stream ? "capture" : "playback",
                 be->dpcm[stream].state);
             continue;
         }
 
         if (--be->dpcm[stream].users != 0)
             continue;
 
         if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) {
             if (!do_hw_free)
                 continue;
 
             if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) {
                 __soc_pcm_hw_free(be, be_substream);
                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
             }
         }
 
         __soc_pcm_close(be, be_substream);
         be_substream->runtime = NULL;
         be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
     }
 }
 
 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream)
 {
     struct snd_soc_pcm_runtime *be;
     struct snd_soc_dpcm *dpcm;
     int err, count = 0;
 
     /* only startup BE DAIs that are either sinks or sources to this FE DAI */
     for_each_dpcm_be(fe, stream, dpcm) {
         struct snd_pcm_substream *be_substream;
 
         be = dpcm->be;
         be_substream = snd_soc_dpcm_get_substream(be, stream);
 
         if (!be_substream) {
             dev_err(be->dev, "ASoC: no backend %s stream\n",
                 stream ? "capture" : "playback");
             continue;
         }
 
         /* is this op for this BE ? */
         if (!snd_soc_dpcm_be_can_update(fe, be, stream))
             continue;
 
         /* first time the dpcm is open ? */
         if (be->dpcm[stream].users == DPCM_MAX_BE_USERS) {
             dev_err(be->dev, "ASoC: too many users %s at open %d\n",
                 stream ? "capture" : "playback",
                 be->dpcm[stream].state);
             continue;
         }
 
         if (be->dpcm[stream].users++ != 0)
             continue;
 
         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) &&
             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE))
             continue;
 
         dev_dbg(be->dev, "ASoC: open %s BE %s\n",
             stream ? "capture" : "playback", be->dai_link->name);
 
         be_substream->runtime = be->dpcm[stream].runtime;
         err = __soc_pcm_open(be, be_substream);
         if (err < 0) {
             be->dpcm[stream].users--;
             if (be->dpcm[stream].users < 0)
                 dev_err(be->dev, "ASoC: no users %s at unwind %d\n",
                     stream ? "capture" : "playback",
                     be->dpcm[stream].state);
 
             be->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
             goto unwind;
         }
         be->dpcm[stream].be_start = 0;
         be->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
         count++;
     }
 
     return count;
 
 unwind:
     dpcm_be_dai_startup_rollback(fe, stream, dpcm);
 
     dev_err(fe->dev, "ASoC: %s() failed at %s (%d)\n",
         __func__, be->dai_link->name, err);
 
     return err;
 }
 
 static void dpcm_runtime_setup_fe(struct snd_pcm_substream *substream)
 {
     struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
     struct snd_pcm_runtime *runtime = substream->runtime;
     struct snd_pcm_hardware *hw = &runtime->hw;
     struct snd_soc_dai *dai;
     int stream = substream->stream;
     int i;
 
     soc_pcm_hw_init(hw);
 
     for_each_rtd_cpu_dais(fe, i, dai) {
         struct snd_soc_pcm_stream *cpu_stream;
 
         /*
          * Skip CPUs which don't support the current stream
          * type. See soc_pcm_init_runtime_hw() for more details
          */
         if (!snd_soc_dai_stream_valid(dai, stream))
             continue;
 
         cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
 
         soc_pcm_hw_update_rate(hw, cpu_stream);
         soc_pcm_hw_update_chan(hw, cpu_stream);
         soc_pcm_hw_update_format(hw, cpu_stream);
     }
 
 }
 
 static void dpcm_runtime_setup_be_format(struct snd_pcm_substream *substream)
 {
     struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
     struct snd_pcm_runtime *runtime = substream->runtime;
     struct snd_pcm_hardware *hw = &runtime->hw;
     struct snd_soc_dpcm *dpcm;
     struct snd_soc_dai *dai;
     int stream = substream->stream;
 
     if (!fe->dai_link->dpcm_merged_format)
         return;
 
     /*
      * It returns merged BE codec format
      * if FE want to use it (= dpcm_merged_format)
      */
 
     for_each_dpcm_be(fe, stream, dpcm) {
         struct snd_soc_pcm_runtime *be = dpcm->be;
         struct snd_soc_pcm_stream *codec_stream;
         int i;
 
         for_each_rtd_codec_dais(be, i, dai) {
             /*
              * Skip CODECs which don't support the current stream
              * type. See soc_pcm_init_runtime_hw() for more details
              */
             if (!snd_soc_dai_stream_valid(dai, stream))
                 continue;
 
             codec_stream = snd_soc_dai_get_pcm_stream(dai, stream);
 
             soc_pcm_hw_update_format(hw, codec_stream);
         }
     }
 }
 
 static void dpcm_runtime_setup_be_chan(struct snd_pcm_substream *substream)
 {
     struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
     struct snd_pcm_runtime *runtime = substream->runtime;
     struct snd_pcm_hardware *hw = &runtime->hw;
     struct snd_soc_dpcm *dpcm;
     int stream = substream->stream;
 
     if (!fe->dai_link->dpcm_merged_chan)
         return;
 
     /*
      * It returns merged BE codec channel;
      * if FE want to use it (= dpcm_merged_chan)
      */
 
     for_each_dpcm_be(fe, stream, dpcm) {
         struct snd_soc_pcm_runtime *be = dpcm->be;
         struct snd_soc_pcm_stream *cpu_stream;
         struct snd_soc_dai *dai;
         int i;
 
         for_each_rtd_cpu_dais(be, i, dai) {
             /*
              * Skip CPUs which don't support the current stream
              * type. See soc_pcm_init_runtime_hw() for more details
              */
             if (!snd_soc_dai_stream_valid(dai, stream))
                 continue;
 
             cpu_stream = snd_soc_dai_get_pcm_stream(dai, stream);
 
             soc_pcm_hw_update_chan(hw, cpu_stream);
         }
 
         /*
          * chan min/max cannot be enforced if there are multiple CODEC
          * DAIs connected to a single CPU DAI, use CPU DAI's directly
          */
         if (be->num_codecs == 1) {
             struct snd_soc_pcm_stream *codec_stream = snd_soc_dai_get_pcm_stream(
                 asoc_rtd_to_codec(be, 0), stream);
 
             soc_pcm_hw_update_chan(hw, codec_stream);
         }
     }
 }
 
 static void dpcm_runtime_setup_be_rate(struct snd_pcm_substream *substream)
 {
     struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
     struct snd_pcm_runtime *runtime = substream->runtime;
     struct snd_pcm_hardware *hw = &runtime->hw;
     struct snd_soc_dpcm *dpcm;
     int stream = substream->stream;
 
     if (!fe->dai_link->dpcm_merged_rate)
         return;
 
     /*
      * It returns merged BE codec channel;
      * if FE want to use it (= dpcm_merged_chan)
      */
 
     for_each_dpcm_be(fe, stream, dpcm) {
         struct snd_soc_pcm_runtime *be = dpcm->be;
         struct snd_soc_pcm_stream *pcm;
         struct snd_soc_dai *dai;
         int i;
 
         for_each_rtd_dais(be, i, dai) {
             /*
              * Skip DAIs which don't support the current stream
              * type. See soc_pcm_init_runtime_hw() for more details
              */
             if (!snd_soc_dai_stream_valid(dai, stream))
                 continue;
 
             pcm = snd_soc_dai_get_pcm_stream(dai, stream);
 
             soc_pcm_hw_update_rate(hw, pcm);
         }
     }
 }
 
 static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
                    int stream)
 {
     struct snd_soc_dpcm *dpcm;
     struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
     struct snd_soc_dai *fe_cpu_dai;
     int err = 0;
     int i;
 
     /* apply symmetry for FE */
     soc_pcm_update_symmetry(fe_substream);
 
     for_each_rtd_cpu_dais (fe, i, fe_cpu_dai) {
         /* Symmetry only applies if we've got an active stream. */
         err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
         if (err < 0)
             goto error;
     }
 
     /* apply symmetry for BE */
     for_each_dpcm_be(fe, stream, dpcm) {
         struct snd_soc_pcm_runtime *be = dpcm->be;
         struct snd_pcm_substream *be_substream =
             snd_soc_dpcm_get_substream(be, stream);
         struct snd_soc_pcm_runtime *rtd;
         struct snd_soc_dai *dai;
 
         /* A backend may not have the requested substream */
         if (!be_substream)
             continue;
 
         rtd = asoc_substream_to_rtd(be_substream);
         if (rtd->dai_link->be_hw_params_fixup)
             continue;
 
         soc_pcm_update_symmetry(be_substream);
 
         /* Symmetry only applies if we've got an active stream. */
         for_each_rtd_dais(rtd, i, dai) {
             err = soc_pcm_apply_symmetry(fe_substream, dai);
             if (err < 0)
                 goto error;
         }
     }
 error:
     if (err < 0)
         dev_err(fe->dev, "ASoC: %s failed (%d)\n", __func__, err);
 
     return err;
 }
 
 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
 {
     struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
     int stream = fe_substream->stream, ret = 0;
 
     dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
 
     ret = dpcm_be_dai_startup(fe, stream);
     if (ret < 0)
         goto be_err;
 
     dev_dbg(fe->dev, "ASoC: open FE %s\n", fe->dai_link->name);
 
     /* start the DAI frontend */
     ret = __soc_pcm_open(fe, fe_substream);
     if (ret < 0)
         goto unwind;
 
     fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
 
     dpcm_runtime_setup_fe(fe_substream);
 
     dpcm_runtime_setup_be_format(fe_substream);
     dpcm_runtime_setup_be_chan(fe_substream);
     dpcm_runtime_setup_be_rate(fe_substream);
 
     ret = dpcm_apply_symmetry(fe_substream, stream);
 
 unwind:
     if (ret < 0)
         dpcm_be_dai_startup_unwind(fe, stream);
 be_err:
     dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
 
     if (ret < 0)
         dev_err(fe->dev, "%s() failed (%d)\n", __func__, ret);
 
     return ret;
 }
 
 static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
 {
     struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
     int stream = substream->stream;
 
     snd_soc_dpcm_mutex_assert_held(fe);
 
     dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
 
     /* shutdown the BEs */
     dpcm_be_dai_shutdown(fe, stream);
 
     dev_dbg(fe->dev, "ASoC: close FE %s\n", fe->dai_link->name);
 
     /* now shutdown the frontend */
     __soc_pcm_close(fe, substream);
 
     /* run the stream stop event */
     dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
 
     fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
     dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
     return 0;
 }
 
 void dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream)
 {
     struct snd_soc_dpcm *dpcm;
 
     /* only hw_params backends that are either sinks or sources
      * to this frontend DAI */
     for_each_dpcm_be(fe, stream, dpcm) {
 
         struct snd_soc_pcm_runtime *be = dpcm->be;
         struct snd_pcm_substream *be_substream =
             snd_soc_dpcm_get_substream(be, stream);
 
         /* is this op for this BE ? */
         if (!snd_soc_dpcm_be_can_update(fe, be, stream))
             continue;
 
         /* only free hw when no longer used - check all FEs */
         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
                 continue;
 
         /* do not free hw if this BE is used by other FE */
         if (be->dpcm[stream].users > 1)
             continue;
 
         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED) &&
             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
             continue;
 
         dev_dbg(be->dev, "ASoC: hw_free BE %s\n",
             be->dai_link->name);
 
         __soc_pcm_hw_free(be, be_substream);
 
         be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
     }
 }
 
 static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
 {
     struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
     int stream = substream->stream;
 
     snd_soc_dpcm_mutex_lock(fe);
     dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
 
     dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
 
     /* call hw_free on the frontend */
     soc_pcm_hw_clean(fe, substream, 0);
 
     /* only hw_params backends that are either sinks or sources
      * to this frontend DAI */
     dpcm_be_dai_hw_free(fe, stream);
 
     fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
     dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
 
     snd_soc_dpcm_mutex_unlock(fe);
     return 0;
 }
 
 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int stream)
 {
     struct snd_soc_pcm_runtime *be;
     struct snd_pcm_substream *be_substream;
     struct snd_soc_dpcm *dpcm;
     int ret;
 
     for_each_dpcm_be(fe, stream, dpcm) {
         be = dpcm->be;
         be_substream = snd_soc_dpcm_get_substream(be, stream);
 
         /* is this op for this BE ? */
         if (!snd_soc_dpcm_be_can_update(fe, be, stream))
             continue;
 
         /* copy params for each dpcm */
         memcpy(&dpcm->hw_params, &fe->dpcm[stream].hw_params,
                 sizeof(struct snd_pcm_hw_params));
 
         /* perform any hw_params fixups */
         ret = snd_soc_link_be_hw_params_fixup(be, &dpcm->hw_params);
         if (ret < 0)
             goto unwind;
 
         /* copy the fixed-up hw params for BE dai */
         memcpy(&be->dpcm[stream].hw_params, &dpcm->hw_params,
                sizeof(struct snd_pcm_hw_params));
 
         /* only allow hw_params() if no connected FEs are running */
         if (!snd_soc_dpcm_can_be_params(fe, be, stream))
             continue;
 
         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE))
             continue;
 
         dev_dbg(be->dev, "ASoC: hw_params BE %s\n",
             be->dai_link->name);
 
         ret = __soc_pcm_hw_params(be, be_substream, &dpcm->hw_params);
         if (ret < 0)
             goto unwind;
 
         be->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
     }
     return 0;
 
 unwind:
     dev_dbg(fe->dev, "ASoC: %s() failed at %s (%d)\n",
         __func__, be->dai_link->name, ret);
 
     /* disable any enabled and non active backends */
     for_each_dpcm_be_rollback(fe, stream, dpcm) {
         be = dpcm->be;
         be_substream = snd_soc_dpcm_get_substream(be, stream);
 
         if (!snd_soc_dpcm_be_can_update(fe, be, stream))
             continue;
 
         /* only allow hw_free() if no connected FEs are running */
         if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
             continue;
 
         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_OPEN) &&
            (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
            (be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_FREE) &&
            (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP))
             continue;
 
         __soc_pcm_hw_free(be, be_substream);
     }
 
     return ret;
 }
 
 static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
                  struct snd_pcm_hw_params *params)
 {
     struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
     int ret, stream = substream->stream;
 
     snd_soc_dpcm_mutex_lock(fe);
     dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
 
     memcpy(&fe->dpcm[stream].hw_params, params,
             sizeof(struct snd_pcm_hw_params));
     ret = dpcm_be_dai_hw_params(fe, stream);
     if (ret < 0)
         goto out;
 
     dev_dbg(fe->dev, "ASoC: hw_params FE %s rate %d chan %x fmt %d\n",
             fe->dai_link->name, params_rate(params),
             params_channels(params), params_format(params));
 
     /* call hw_params on the frontend */
     ret = __soc_pcm_hw_params(fe, substream, params);
     if (ret < 0)
         dpcm_be_dai_hw_free(fe, stream);
     else
         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
 
 out:
     dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
     snd_soc_dpcm_mutex_unlock(fe);
 
     if (ret < 0)
         dev_err(fe->dev, "ASoC: %s failed (%d)\n", __func__, ret);
 
     return ret;
 }
 
 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
                    int cmd)
 {
     struct snd_soc_pcm_runtime *be;
     bool pause_stop_transition;
     struct snd_soc_dpcm *dpcm;
     unsigned long flags;
     int ret = 0;
 
     for_each_dpcm_be(fe, stream, dpcm) {
         struct snd_pcm_substream *be_substream;
 
         be = dpcm->be;
         be_substream = snd_soc_dpcm_get_substream(be, stream);
 
         snd_soc_dpcm_stream_lock_irqsave_nested(be, stream, flags);
 
         /* is this op for this BE ? */
         if (!snd_soc_dpcm_be_can_update(fe, be, stream))
             goto next;
 
         dev_dbg(be->dev, "ASoC: trigger BE %s cmd %d\n",
             be->dai_link->name, cmd);
 
         switch (cmd) {
         case SNDRV_PCM_TRIGGER_START:
             if (!be->dpcm[stream].be_start &&
                 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PREPARE) &&
                 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
                 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
                 goto next;
 
             be->dpcm[stream].be_start++;
             if (be->dpcm[stream].be_start != 1)
                 goto next;
 
             if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_PAUSED)
                 ret = soc_pcm_trigger(be_substream,
                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
             else
                 ret = soc_pcm_trigger(be_substream,
                               SNDRV_PCM_TRIGGER_START);
             if (ret) {
                 be->dpcm[stream].be_start--;
                 goto next;
             }
 
             be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
             break;
         case SNDRV_PCM_TRIGGER_RESUME:
             if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND))
                 goto next;
 
             be->dpcm[stream].be_start++;
             if (be->dpcm[stream].be_start != 1)
                 goto next;
 
             ret = soc_pcm_trigger(be_substream, cmd);
             if (ret) {
                 be->dpcm[stream].be_start--;
                 goto next;
             }
 
             be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
             break;
         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
             if (!be->dpcm[stream].be_start &&
                 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
                 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
                 goto next;
 
             fe->dpcm[stream].fe_pause = false;
             be->dpcm[stream].be_pause--;
 
             be->dpcm[stream].be_start++;
             if (be->dpcm[stream].be_start != 1)
                 goto next;
 
             ret = soc_pcm_trigger(be_substream, cmd);
             if (ret) {
                 be->dpcm[stream].be_start--;
                 goto next;
             }
 
             be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
             break;
         case SNDRV_PCM_TRIGGER_STOP:
             if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_START) &&
                 (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
                 goto next;
 
             if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
                 be->dpcm[stream].be_start--;
 
             if (be->dpcm[stream].be_start != 0)
                 goto next;
 
             pause_stop_transition = false;
             if (fe->dpcm[stream].fe_pause) {
                 pause_stop_transition = true;
                 fe->dpcm[stream].fe_pause = false;
                 be->dpcm[stream].be_pause--;
             }
 
             if (be->dpcm[stream].be_pause != 0)
                 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
             else
                 ret = soc_pcm_trigger(be_substream, SNDRV_PCM_TRIGGER_STOP);
 
             if (ret) {
                 if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
                     be->dpcm[stream].be_start++;
                 if (pause_stop_transition) {
                     fe->dpcm[stream].fe_pause = true;
                     be->dpcm[stream].be_pause++;
                 }
                 goto next;
             }
 
             if (be->dpcm[stream].be_pause != 0)
                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
             else
                 be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
 
             break;
         case SNDRV_PCM_TRIGGER_SUSPEND:
             if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
                 goto next;
 
             be->dpcm[stream].be_start--;
             if (be->dpcm[stream].be_start != 0)
                 goto next;
 
             ret = soc_pcm_trigger(be_substream, cmd);
             if (ret) {
                 be->dpcm[stream].be_start++;
                 goto next;
             }
 
             be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
             break;
         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
             if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
                 goto next;
 
             fe->dpcm[stream].fe_pause = true;
             be->dpcm[stream].be_pause++;
 
             be->dpcm[stream].be_start--;
             if (be->dpcm[stream].be_start != 0)
                 goto next;
 
             ret = soc_pcm_trigger(be_substream, cmd);
             if (ret) {
                 be->dpcm[stream].be_start++;
                 goto next;
             }
 
             be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
             break;
         }
 next:
         snd_soc_dpcm_stream_unlock_irqrestore(be, stream, flags);
         if (ret)
             break;
     }
     if (ret < 0)
         dev_err(fe->dev, "ASoC: %s() failed at %s (%d)\n",
             __func__, be->dai_link->name, ret);
     return ret;
 }
 EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
 
 static int dpcm_dai_trigger_fe_be(struct snd_pcm_substream *substream,
                   int cmd, bool fe_first)
 {
     struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
     int ret;
 
     /* call trigger on the frontend before the backend. */
     if (fe_first) {
         dev_dbg(fe->dev, "ASoC: pre trigger FE %s cmd %d\n",
             fe->dai_link->name, cmd);
 
         ret = soc_pcm_trigger(substream, cmd);
         if (ret < 0)
             return ret;
 
         ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
         return ret;
     }
 
     /* call trigger on the frontend after the backend. */
     ret = dpcm_be_dai_trigger(fe, substream->stream, cmd);
     if (ret < 0)
         return ret;
 
     dev_dbg(fe->dev, "ASoC: post trigger FE %s cmd %d\n",
         fe->dai_link->name, cmd);
 
     ret = soc_pcm_trigger(substream, cmd);
 
     return ret;
 }
 
 static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
 {
     struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
     int stream = substream->stream;
     int ret = 0;
     enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
 
     fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
 
     switch (trigger) {
     case SND_SOC_DPCM_TRIGGER_PRE:
         switch (cmd) {
         case SNDRV_PCM_TRIGGER_START:
         case SNDRV_PCM_TRIGGER_RESUME:
         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
         case SNDRV_PCM_TRIGGER_DRAIN:
             ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
             break;
         case SNDRV_PCM_TRIGGER_STOP:
         case SNDRV_PCM_TRIGGER_SUSPEND:
         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
             ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
             break;
         default:
             ret = -EINVAL;
             break;
         }
         break;
     case SND_SOC_DPCM_TRIGGER_POST:
         switch (cmd) {
         case SNDRV_PCM_TRIGGER_START:
         case SNDRV_PCM_TRIGGER_RESUME:
         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
         case SNDRV_PCM_TRIGGER_DRAIN:
             ret = dpcm_dai_trigger_fe_be(substream, cmd, false);
             break;
         case SNDRV_PCM_TRIGGER_STOP:
         case SNDRV_PCM_TRIGGER_SUSPEND:
         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
             ret = dpcm_dai_trigger_fe_be(substream, cmd, true);
             break;
         default:
             ret = -EINVAL;
             break;
         }
         break;
     case SND_SOC_DPCM_TRIGGER_BESPOKE:
         /* bespoke trigger() - handles both FE and BEs */
 
         dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd %d\n",
                 fe->dai_link->name, cmd);
 
         ret = snd_soc_pcm_dai_bespoke_trigger(substream, cmd);
         break;
     default:
         dev_err(fe->dev, "ASoC: invalid trigger cmd %d for %s\n", cmd,
                 fe->dai_link->name);
         ret = -EINVAL;
         goto out;
     }
 
     if (ret < 0) {
         dev_err(fe->dev, "ASoC: trigger FE cmd: %d failed: %d\n",
             cmd, ret);
         goto out;
     }
 
     switch (cmd) {
     case SNDRV_PCM_TRIGGER_START:
     case SNDRV_PCM_TRIGGER_RESUME:
     case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
         break;
     case SNDRV_PCM_TRIGGER_STOP:
     case SNDRV_PCM_TRIGGER_SUSPEND:
         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
         break;
     case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
         fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
         break;
     }
 
 out:
     fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
     return ret;
 }
 
 static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
 {
     struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
     int stream = substream->stream;
 
     /* if FE's runtime_update is already set, we're in race;
      * process this trigger later at exit
      */
     if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
         fe->dpcm[stream].trigger_pending = cmd + 1;
         return 0; /* delayed, assuming it's successful */
     }
 
     /* we're alone, let's trigger */
     return dpcm_fe_dai_do_trigger(substream, cmd);
 }
 
 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
 {
     struct snd_soc_dpcm *dpcm;
     int ret = 0;
 
     for_each_dpcm_be(fe, stream, dpcm) {
 
         struct snd_soc_pcm_runtime *be = dpcm->be;
         struct snd_pcm_substream *be_substream =
             snd_soc_dpcm_get_substream(be, stream);
 
         /* is this op for this BE ? */
         if (!snd_soc_dpcm_be_can_update(fe, be, stream))
             continue;
 
         if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) &&
             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) &&
             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND) &&
             (be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
             continue;
 
         dev_dbg(be->dev, "ASoC: prepare BE %s\n",
             be->dai_link->name);
 
         ret = __soc_pcm_prepare(be, be_substream);
         if (ret < 0)
             break;
 
         be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
     }
 
     if (ret < 0)
         dev_err(fe->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
 
     return ret;
 }
 
 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
 {
     struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(substream);
     int stream = substream->stream, ret = 0;
 
     snd_soc_dpcm_mutex_lock(fe);
 
     dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
 
     dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
 
     /* there is no point preparing this FE if there are no BEs */
     if (list_empty(&fe->dpcm[stream].be_clients)) {
         dev_err(fe->dev, "ASoC: no backend DAIs enabled for %s\n",
                 fe->dai_link->name);
         ret = -EINVAL;
         goto out;
     }
 
     ret = dpcm_be_dai_prepare(fe, stream);
     if (ret < 0)
         goto out;
 
     /* call prepare on the frontend */
     ret = __soc_pcm_prepare(fe, substream);
     if (ret < 0)
         goto out;
 
     fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
 
 out:
     dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
     snd_soc_dpcm_mutex_unlock(fe);
 
     if (ret < 0)
         dev_err(fe->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
 
     return ret;
 }
 
 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)
 {
     struct snd_pcm_substream *substream =
         snd_soc_dpcm_get_substream(fe, stream);
     enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
     int err;
 
     dev_dbg(fe->dev, "ASoC: runtime %s close on FE %s\n",
             stream ? "capture" : "playback", fe->dai_link->name);
 
     if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
         /* call bespoke trigger - FE takes care of all BE triggers */
         dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd stop\n",
                 fe->dai_link->name);
 
         err = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_STOP);
     } else {
         dev_dbg(fe->dev, "ASoC: trigger FE %s cmd stop\n",
             fe->dai_link->name);
 
         err = dpcm_be_dai_trigger(fe, stream, SNDRV_PCM_TRIGGER_STOP);
     }
 
     dpcm_be_dai_hw_free(fe, stream);
 
     dpcm_be_dai_shutdown(fe, stream);
 
     /* run the stream event for each BE */
     dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
 
     if (err < 0)
         dev_err(fe->dev, "ASoC: %s() failed (%d)\n", __func__, err);
 
     return err;
 }
 
 static int dpcm_run_update_startup(struct snd_soc_pcm_runtime *fe, int stream)
 {
     struct snd_pcm_substream *substream =
         snd_soc_dpcm_get_substream(fe, stream);
     struct snd_soc_dpcm *dpcm;
     enum snd_soc_dpcm_trigger trigger = fe->dai_link->trigger[stream];
     int ret = 0;
 
     dev_dbg(fe->dev, "ASoC: runtime %s open on FE %s\n",
             stream ? "capture" : "playback", fe->dai_link->name);
 
     /* Only start the BE if the FE is ready */
     if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_FREE ||
         fe->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE) {
         dev_err(fe->dev, "ASoC: FE %s is not ready %d\n",
             fe->dai_link->name, fe->dpcm[stream].state);
         ret = -EINVAL;
         goto disconnect;
     }
 
     /* startup must always be called for new BEs */
     ret = dpcm_be_dai_startup(fe, stream);
     if (ret < 0)
         goto disconnect;
 
     /* keep going if FE state is > open */
     if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_OPEN)
         return 0;
 
     ret = dpcm_be_dai_hw_params(fe, stream);
     if (ret < 0)
         goto close;
 
     /* keep going if FE state is > hw_params */
     if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_HW_PARAMS)
         return 0;
 
     ret = dpcm_be_dai_prepare(fe, stream);
     if (ret < 0)
         goto hw_free;
 
     /* run the stream event for each BE */
     dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_NOP);
 
     /* keep going if FE state is > prepare */
     if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_PREPARE ||
         fe->dpcm[stream].state == SND_SOC_DPCM_STATE_STOP)
         return 0;
 
     if (trigger == SND_SOC_DPCM_TRIGGER_BESPOKE) {
         /* call trigger on the frontend - FE takes care of all BE triggers */
         dev_dbg(fe->dev, "ASoC: bespoke trigger FE %s cmd start\n",
                 fe->dai_link->name);
 
         ret = snd_soc_pcm_dai_bespoke_trigger(substream, SNDRV_PCM_TRIGGER_START);
         if (ret < 0)
             goto hw_free;
     } else {
         dev_dbg(fe->dev, "ASoC: trigger FE %s cmd start\n",
             fe->dai_link->name);
 
         ret = dpcm_be_dai_trigger(fe, stream,
                     SNDRV_PCM_TRIGGER_START);
         if (ret < 0)
             goto hw_free;
     }
 
     return 0;
 
 hw_free:
     dpcm_be_dai_hw_free(fe, stream);
 close:
     dpcm_be_dai_shutdown(fe, stream);
 disconnect:
     /* disconnect any pending BEs */
     for_each_dpcm_be(fe, stream, dpcm) {
         struct snd_soc_pcm_runtime *be = dpcm->be;
 
         /* is this op for this BE ? */
         if (!snd_soc_dpcm_be_can_update(fe, be, stream))
             continue;
 
         if (be->dpcm[stream].state == SND_SOC_DPCM_STATE_CLOSE ||
             be->dpcm[stream].state == SND_SOC_DPCM_STATE_NEW)
                 dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
     }
 
     if (ret < 0)
         dev_err(fe->dev, "ASoC: %s() failed (%d)\n", __func__, ret);
 
     return ret;
 }
 
 static int soc_dpcm_fe_runtime_update(struct snd_soc_pcm_runtime *fe, int new)
 {
     struct snd_soc_dapm_widget_list *list;
     int stream;
     int count, paths;
 
     if (!fe->dai_link->dynamic)
         return 0;
 
     if (fe->num_cpus > 1) {
         dev_err(fe->dev,
             "%s doesn't support Multi CPU yet\n", __func__);
         return -EINVAL;
     }
 
     /* only check active links */
     if (!snd_soc_dai_active(asoc_rtd_to_cpu(fe, 0)))
         return 0;
 
     /* DAPM sync will call this to update DSP paths */
     dev_dbg(fe->dev, "ASoC: DPCM %s runtime update for FE %s\n",
         new ? "new" : "old", fe->dai_link->name);
 
     for_each_pcm_streams(stream) {
 
         /* skip if FE doesn't have playback/capture capability */
         if (!snd_soc_dai_stream_valid(asoc_rtd_to_cpu(fe, 0),   stream) ||
             !snd_soc_dai_stream_valid(asoc_rtd_to_codec(fe, 0), stream))
             continue;
 
         /* skip if FE isn't currently playing/capturing */
         if (!snd_soc_dai_stream_active(asoc_rtd_to_cpu(fe, 0), stream) ||
             !snd_soc_dai_stream_active(asoc_rtd_to_codec(fe, 0), stream))
             continue;
 
         paths = dpcm_path_get(fe, stream, &list);
         if (paths < 0)
             return paths;
 
         /* update any playback/capture paths */
         count = dpcm_process_paths(fe, stream, &list, new);
         if (count) {
             dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
             if (new)
                 dpcm_run_update_startup(fe, stream);
             else
                 dpcm_run_update_shutdown(fe, stream);
             dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
 
             dpcm_clear_pending_state(fe, stream);
             dpcm_be_disconnect(fe, stream);
         }
 
         dpcm_path_put(&list);
     }
 
     return 0;
 }
 
 /* Called by DAPM mixer/mux changes to update audio routing between PCMs and
  * any DAI links.
  */
 int snd_soc_dpcm_runtime_update(struct snd_soc_card *card)
 {
     struct snd_soc_pcm_runtime *fe;
     int ret = 0;
 
     mutex_lock_nested(&card->pcm_mutex, card->pcm_subclass);
     /* shutdown all old paths first */
     for_each_card_rtds(card, fe) {
         ret = soc_dpcm_fe_runtime_update(fe, 0);
         if (ret)
             goto out;
     }
 
     /* bring new paths up */
     for_each_card_rtds(card, fe) {
         ret = soc_dpcm_fe_runtime_update(fe, 1);
         if (ret)
             goto out;
     }
 
 out:
     mutex_unlock(&card->pcm_mutex);
     return ret;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dpcm_runtime_update);
 
 static void dpcm_fe_dai_cleanup(struct snd_pcm_substream *fe_substream)
 {
     struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
     struct snd_soc_dpcm *dpcm;
     int stream = fe_substream->stream;
 
     snd_soc_dpcm_mutex_assert_held(fe);
 
     /* mark FE's links ready to prune */
     for_each_dpcm_be(fe, stream, dpcm)
         dpcm->state = SND_SOC_DPCM_LINK_STATE_FREE;
 
     dpcm_be_disconnect(fe, stream);
 
     fe->dpcm[stream].runtime = NULL;
 }
 
 static int dpcm_fe_dai_close(struct snd_pcm_substream *fe_substream)
 {
     struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
     int ret;
 
     snd_soc_dpcm_mutex_lock(fe);
     ret = dpcm_fe_dai_shutdown(fe_substream);
 
     dpcm_fe_dai_cleanup(fe_substream);
 
     snd_soc_dpcm_mutex_unlock(fe);
     return ret;
 }
 
 static int dpcm_fe_dai_open(struct snd_pcm_substream *fe_substream)
 {
     struct snd_soc_pcm_runtime *fe = asoc_substream_to_rtd(fe_substream);
     struct snd_soc_dapm_widget_list *list;
     int ret;
     int stream = fe_substream->stream;
 
     snd_soc_dpcm_mutex_lock(fe);
     fe->dpcm[stream].runtime = fe_substream->runtime;
 
     ret = dpcm_path_get(fe, stream, &list);
     if (ret < 0)
         goto open_end;
 
     /* calculate valid and active FE <-> BE dpcms */
     dpcm_process_paths(fe, stream, &list, 1);
 
     ret = dpcm_fe_dai_startup(fe_substream);
     if (ret < 0)
         dpcm_fe_dai_cleanup(fe_substream);
 
     dpcm_clear_pending_state(fe, stream);
     dpcm_path_put(&list);
 open_end:
     snd_soc_dpcm_mutex_unlock(fe);
     return ret;
 }
 
 static int soc_get_playback_capture(struct snd_soc_pcm_runtime *rtd,
                     int *playback, int *capture)
 {
     struct snd_soc_dai *cpu_dai;
     int i;
 
     if (rtd->dai_link->dynamic && rtd->num_cpus > 1) {
         dev_err(rtd->dev,
             "DPCM doesn't support Multi CPU for Front-Ends yet\n");
         return -EINVAL;
     }
 
     if (rtd->dai_link->dynamic || rtd->dai_link->no_pcm) {
         int stream;
 
         if (rtd->dai_link->dpcm_playback) {
             stream = SNDRV_PCM_STREAM_PLAYBACK;
 
             for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
                     *playback = 1;
                     break;
                 }
             }
             if (!*playback) {
                 dev_err(rtd->card->dev,
                     "No CPU DAIs support playback for stream %s\n",
                     rtd->dai_link->stream_name);
                 return -EINVAL;
             }
         }
         if (rtd->dai_link->dpcm_capture) {
             stream = SNDRV_PCM_STREAM_CAPTURE;
 
             for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
                 if (snd_soc_dai_stream_valid(cpu_dai, stream)) {
                     *capture = 1;
                     break;
                 }
             }
 
             if (!*capture) {
                 dev_err(rtd->card->dev,
                     "No CPU DAIs support capture for stream %s\n",
                     rtd->dai_link->stream_name);
                 return -EINVAL;
             }
         }
     } else {
         struct snd_soc_dai *codec_dai;
 
         /* Adapt stream for codec2codec links */
         int cpu_capture = rtd->dai_link->params ?
             SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
         int cpu_playback = rtd->dai_link->params ?
             SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
 
         for_each_rtd_codec_dais(rtd, i, codec_dai) {
             if (rtd->num_cpus == 1) {
                 cpu_dai = asoc_rtd_to_cpu(rtd, 0);
             } else if (rtd->num_cpus == rtd->num_codecs) {
                 cpu_dai = asoc_rtd_to_cpu(rtd, i);
             } else {
                 dev_err(rtd->card->dev,
                     "N cpus to M codecs link is not supported yet\n");
                 return -EINVAL;
             }
 
             if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
                 snd_soc_dai_stream_valid(cpu_dai,   cpu_playback))
                 *playback = 1;
             if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
                 snd_soc_dai_stream_valid(cpu_dai,   cpu_capture))
                 *capture = 1;
         }
     }
 
     if (rtd->dai_link->playback_only) {
         *playback = 1;
         *capture = 0;
     }
 
     if (rtd->dai_link->capture_only) {
         *playback = 0;
         *capture = 1;
     }
 
     return 0;
 }
 
 static int soc_create_pcm(struct snd_pcm **pcm,
               struct snd_soc_pcm_runtime *rtd,
               int playback, int capture, int num)
 {
     char new_name[64];
     int ret;
 
     /* create the PCM */
     if (rtd->dai_link->params) {
         snprintf(new_name, sizeof(new_name), "codec2codec(%s)",
              rtd->dai_link->stream_name);
 
         ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
                        playback, capture, pcm);
     } else if (rtd->dai_link->no_pcm) {
         snprintf(new_name, sizeof(new_name), "(%s)",
             rtd->dai_link->stream_name);
 
         ret = snd_pcm_new_internal(rtd->card->snd_card, new_name, num,
                 playback, capture, pcm);
     } else {
         if (rtd->dai_link->dynamic)
             snprintf(new_name, sizeof(new_name), "%s (*)",
                 rtd->dai_link->stream_name);
         else
             snprintf(new_name, sizeof(new_name), "%s %s-%d",
                 rtd->dai_link->stream_name,
                 soc_codec_dai_name(rtd), num);
 
         ret = snd_pcm_new(rtd->card->snd_card, new_name, num, playback,
             capture, pcm);
     }
     if (ret < 0) {
         dev_err(rtd->card->dev, "ASoC: can't create pcm %s for dailink %s: %d\n",
             new_name, rtd->dai_link->name, ret);
         return ret;
     }
     dev_dbg(rtd->card->dev, "ASoC: registered pcm #%d %s\n",num, new_name);
 
     return 0;
 }
 
 /* create a new pcm */
 int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
 {
     struct snd_soc_component *component;
     struct snd_pcm *pcm;
     int ret = 0, playback = 0, capture = 0;
     int i;
 
     ret = soc_get_playback_capture(rtd, &playback, &capture);
     if (ret < 0)
         return ret;
 
     ret = soc_create_pcm(&pcm, rtd, playback, capture, num);
     if (ret < 0)
         return ret;
 
     /* DAPM dai link stream work */
     if (rtd->dai_link->params)
         rtd->close_delayed_work_func = codec2codec_close_delayed_work;
     else
         rtd->close_delayed_work_func = snd_soc_close_delayed_work;
 
     rtd->pcm = pcm;
     pcm->nonatomic = rtd->dai_link->nonatomic;
     pcm->private_data = rtd;
 
     if (rtd->dai_link->no_pcm || rtd->dai_link->params) {
         if (playback)
             pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->private_data = rtd;
         if (capture)
             pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream->private_data = rtd;
         goto out;
     }
 
     /* ASoC PCM operations */
     if (rtd->dai_link->dynamic) {
         rtd->ops.open       = dpcm_fe_dai_open;
         rtd->ops.hw_params  = dpcm_fe_dai_hw_params;
         rtd->ops.prepare    = dpcm_fe_dai_prepare;
         rtd->ops.trigger    = dpcm_fe_dai_trigger;
         rtd->ops.hw_free    = dpcm_fe_dai_hw_free;
         rtd->ops.close      = dpcm_fe_dai_close;
         rtd->ops.pointer    = soc_pcm_pointer;
     } else {
         rtd->ops.open       = soc_pcm_open;
         rtd->ops.hw_params  = soc_pcm_hw_params;
         rtd->ops.prepare    = soc_pcm_prepare;
         rtd->ops.trigger    = soc_pcm_trigger;
         rtd->ops.hw_free    = soc_pcm_hw_free;
         rtd->ops.close      = soc_pcm_close;
         rtd->ops.pointer    = soc_pcm_pointer;
     }
 
     for_each_rtd_components(rtd, i, component) {
         const struct snd_soc_component_driver *drv = component->driver;
 
         if (drv->ioctl)
             rtd->ops.ioctl      = snd_soc_pcm_component_ioctl;
         if (drv->sync_stop)
             rtd->ops.sync_stop  = snd_soc_pcm_component_sync_stop;
         if (drv->copy_user)
             rtd->ops.copy_user  = snd_soc_pcm_component_copy_user;
         if (drv->page)
             rtd->ops.page       = snd_soc_pcm_component_page;
         if (drv->mmap)
             rtd->ops.mmap       = snd_soc_pcm_component_mmap;
         if (drv->ack)
             rtd->ops.ack            = snd_soc_pcm_component_ack;
     }
 
     if (playback)
         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &rtd->ops);
 
     if (capture)
         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &rtd->ops);
 
     ret = snd_soc_pcm_component_new(rtd);
     if (ret < 0)
         return ret;
 
     pcm->no_device_suspend = true;
 out:
     dev_dbg(rtd->card->dev, "%s <-> %s mapping ok\n",
         soc_codec_dai_name(rtd), soc_cpu_dai_name(rtd));
     return ret;
 }
 
 /* is the current PCM operation for this FE ? */
 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream)
 {
     if (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE)
         return 1;
     return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dpcm_fe_can_update);
 
 /* is the current PCM operation for this BE ? */
 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
         struct snd_soc_pcm_runtime *be, int stream)
 {
     if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
        ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
           be->dpcm[stream].runtime_update))
         return 1;
     return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dpcm_be_can_update);
 
 /* get the substream for this BE */
 struct snd_pcm_substream *
     snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
 {
     return be->pcm->streams[stream].substream;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dpcm_get_substream);
 
 static int snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime *fe,
                     struct snd_soc_pcm_runtime *be,
                     int stream,
                     const enum snd_soc_dpcm_state *states,
                     int num_states)
 {
     struct snd_soc_dpcm *dpcm;
     int state;
     int ret = 1;
     int i;
 
     for_each_dpcm_fe(be, stream, dpcm) {
 
         if (dpcm->fe == fe)
             continue;
 
         state = dpcm->fe->dpcm[stream].state;
         for (i = 0; i < num_states; i++) {
             if (state == states[i]) {
                 ret = 0;
                 break;
             }
         }
     }
 
     /* it's safe to do this BE DAI */
     return ret;
 }
 
 /*
  * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
  * are not running, paused or suspended for the specified stream direction.
  */
 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
         struct snd_soc_pcm_runtime *be, int stream)
 {
     const enum snd_soc_dpcm_state state[] = {
         SND_SOC_DPCM_STATE_START,
         SND_SOC_DPCM_STATE_PAUSED,
         SND_SOC_DPCM_STATE_SUSPEND,
     };
 
     return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
 }
 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
 
 /*
  * We can only change hw params a BE DAI if any of it's FE are not prepared,
  * running, paused or suspended for the specified stream direction.
  */
 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
         struct snd_soc_pcm_runtime *be, int stream)
 {
     const enum snd_soc_dpcm_state state[] = {
         SND_SOC_DPCM_STATE_START,
         SND_SOC_DPCM_STATE_PAUSED,
         SND_SOC_DPCM_STATE_SUSPEND,
         SND_SOC_DPCM_STATE_PREPARE,
     };
 
     return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
 }
 EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);