include/sound/soc-dpcm.h

   1 /*
   2  * linux/sound/soc-dpcm.h -- ALSA SoC Dynamic PCM Support
   3  *
   4  * Author:              Liam Girdwood <lrg@ti.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #ifndef __LINUX_SND_SOC_DPCM_H
  12 #define __LINUX_SND_SOC_DPCM_H
  13
  14 #include <linux/slab.h>
  15 #include <linux/list.h>
  16 #include <sound/pcm.h>
  17
  18 struct snd_soc_pcm_runtime;
  19
  20 /*
  21  * Types of runtime_update to perform. e.g. originated from FE PCM ops
  22  * or audio route changes triggered by muxes/mixers.
  23  */
  24 enum snd_soc_dpcm_update {
  25         SND_SOC_DPCM_UPDATE_NO  = 0,
  26         SND_SOC_DPCM_UPDATE_BE,
  27         SND_SOC_DPCM_UPDATE_FE,
  28 };
  29
  30 /*
  31  * Dynamic PCM Frontend -> Backend link management states.
  32  */
  33 enum snd_soc_dpcm_link_state {
  34         SND_SOC_DPCM_LINK_STATE_NEW     = 0,    /* newly created link */
  35         SND_SOC_DPCM_LINK_STATE_FREE,           /* link to be dismantled */
  36 };
  37
  38 /*
  39  * Dynamic PCM Frontend -> Backend link PCM states.
  40  */
  41 enum snd_soc_dpcm_state {
  42         SND_SOC_DPCM_STATE_NEW  = 0,
  43         SND_SOC_DPCM_STATE_OPEN,
  44         SND_SOC_DPCM_STATE_HW_PARAMS,
  45         SND_SOC_DPCM_STATE_PREPARE,
  46         SND_SOC_DPCM_STATE_START,
  47         SND_SOC_DPCM_STATE_STOP,
  48         SND_SOC_DPCM_STATE_PAUSED,
  49         SND_SOC_DPCM_STATE_SUSPEND,
  50         SND_SOC_DPCM_STATE_HW_FREE,
  51         SND_SOC_DPCM_STATE_CLOSE,
  52 };
  53
  54 /*
  55  * Dynamic PCM trigger ordering. Triggering flexibility is required as some
  56  * DSPs require triggering before/after their CPU platform and DAIs.
  57  *
  58  * i.e. some clients may want to manually order this call in their PCM
  59  * trigger() whilst others will just use the regular core ordering.
  60  */
  61 enum snd_soc_dpcm_trigger {
  62         SND_SOC_DPCM_TRIGGER_PRE                = 0,
  63         SND_SOC_DPCM_TRIGGER_POST,
  64         SND_SOC_DPCM_TRIGGER_BESPOKE,
  65 };
  66
  67 /*
  68  * Dynamic PCM link
  69  * This links together a FE and BE DAI at runtime and stores the link
  70  * state information and the hw_params configuration.
  71  */
  72 struct snd_soc_dpcm {
  73         /* FE and BE DAIs*/
  74         struct snd_soc_pcm_runtime *be;
  75         struct snd_soc_pcm_runtime *fe;
  76
  77         /* link state */
  78         enum snd_soc_dpcm_link_state state;
  79
  80         /* list of BE and FE for this DPCM link */
  81         struct list_head list_be;
  82         struct list_head list_fe;
  83
  84         /* hw params for this link - may be different for each link */
  85         struct snd_pcm_hw_params hw_params;
  86 #ifdef CONFIG_DEBUG_FS
  87         struct dentry *debugfs_state;
  88 #endif
  89 };
  90
  91 /*
  92  * Dynamic PCM runtime data.
  93  */
  94 struct snd_soc_dpcm_runtime {
  95         struct list_head be_clients;
  96         struct list_head fe_clients;
  97
  98         int users;
  99         struct snd_pcm_runtime *runtime;
 100         struct snd_pcm_hw_params hw_params;
 101
 102         /* state and update */
 103         enum snd_soc_dpcm_update runtime_update;
 104         enum snd_soc_dpcm_state state;
 105
 106         int trigger_pending; /* trigger cmd + 1 if pending, 0 if not */
 107 };
 108
 109 /* can this BE stop and free */
 110 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
 111                 struct snd_soc_pcm_runtime *be, int stream);
 112
 113 /* can this BE perform a hw_params() */
 114 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
 115                 struct snd_soc_pcm_runtime *be, int stream);
 116
 117 /* is the current PCM operation for this FE ? */
 118 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream);
 119
 120 /* is the current PCM operation for this BE ? */
 121 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
 122                 struct snd_soc_pcm_runtime *be, int stream);
 123
 124 /* get the substream for this BE */
 125 struct snd_pcm_substream *
 126         snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream);
 127
 128 /* get the BE runtime state */
 129 enum snd_soc_dpcm_state
 130         snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream);
 131
 132 /* set the BE runtime state */
 133 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be, int stream,
 134         enum snd_soc_dpcm_state state);
 135
 136 /* internal use only */
 137 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute);
 138 void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd);
 139 int soc_dpcm_runtime_update(struct snd_soc_card *);
 140
 141 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
 142         int stream, struct snd_soc_dapm_widget_list **list_);
 143 int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
 144         int stream, struct snd_soc_dapm_widget_list **list, int new);
 145 int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream);
 146 int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream);
 147 void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream);
 148 void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream);
 149 int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream);
 150 int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int tream);
 151 int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream, int cmd);
 152 int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream);
 153 int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
 154         int event);
 155
 156 static inline void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
 157 {
 158         kfree(*list);
 159 }
 160
 161
 162 #endif