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/list.h> 15 #include <sound/pcm.h> 16 17 struct snd_soc_pcm_runtime; 18 19 /* 20 * Types of runtime_update to perform. e.g. originated from FE PCM ops 21 * or audio route changes triggered by muxes/mixers. 22 */ 23 enum snd_soc_dpcm_update { 24 SND_SOC_DPCM_UPDATE_NO = 0, 25 SND_SOC_DPCM_UPDATE_BE, 26 SND_SOC_DPCM_UPDATE_FE, 27 }; 28 29 /* 30 * Dynamic PCM Frontend -> Backend link management states. 31 */ 32 enum snd_soc_dpcm_link_state { 33 SND_SOC_DPCM_LINK_STATE_NEW = 0, /* newly created link */ 34 SND_SOC_DPCM_LINK_STATE_FREE, /* link to be dismantled */ 35 }; 36 37 /* 38 * Dynamic PCM Frontend -> Backend link PCM states. 39 */ 40 enum snd_soc_dpcm_state { 41 SND_SOC_DPCM_STATE_NEW = 0, 42 SND_SOC_DPCM_STATE_OPEN, 43 SND_SOC_DPCM_STATE_HW_PARAMS, 44 SND_SOC_DPCM_STATE_PREPARE, 45 SND_SOC_DPCM_STATE_START, 46 SND_SOC_DPCM_STATE_STOP, 47 SND_SOC_DPCM_STATE_PAUSED, 48 SND_SOC_DPCM_STATE_SUSPEND, 49 SND_SOC_DPCM_STATE_HW_FREE, 50 SND_SOC_DPCM_STATE_CLOSE, 51 }; 52 53 /* 54 * Dynamic PCM trigger ordering. Triggering flexibility is required as some 55 * DSPs require triggering before/after their CPU platform and DAIs. 56 * 57 * i.e. some clients may want to manually order this call in their PCM 58 * trigger() whilst others will just use the regular core ordering. 59 */ 60 enum snd_soc_dpcm_trigger { 61 SND_SOC_DPCM_TRIGGER_PRE = 0, 62 SND_SOC_DPCM_TRIGGER_POST, 63 }; 64 65 /* 66 * Dynamic PCM link 67 * This links together a FE and BE DAI at runtime and stores the link 68 * state information and the hw_params configuration. 69 */ 70 struct snd_soc_dpcm { 71 /* FE and BE DAIs*/ 72 struct snd_soc_pcm_runtime *be; 73 struct snd_soc_pcm_runtime *fe; 74 75 /* link state */ 76 enum snd_soc_dpcm_link_state state; 77 78 /* list of BE and FE for this DPCM link */ 79 struct list_head list_be; 80 struct list_head list_fe; 81 82 /* hw params for this link - may be different for each link */ 83 struct snd_pcm_hw_params hw_params; 84 #ifdef CONFIG_DEBUG_FS 85 struct dentry *debugfs_state; 86 #endif 87 }; 88 89 /* 90 * Dynamic PCM runtime data. 91 */ 92 struct snd_soc_dpcm_runtime { 93 struct list_head be_clients; 94 struct list_head fe_clients; 95 96 int users; 97 struct snd_pcm_runtime *runtime; 98 struct snd_pcm_hw_params hw_params; 99 100 /* state and update */ 101 enum snd_soc_dpcm_update runtime_update; 102 enum snd_soc_dpcm_state state; 103 }; 104 105 /* can this BE stop and free */ 106 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe, 107 struct snd_soc_pcm_runtime *be, int stream); 108 109 /* can this BE perform a hw_params() */ 110 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe, 111 struct snd_soc_pcm_runtime *be, int stream); 112 113 /* is the current PCM operation for this FE ? */ 114 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream); 115 116 /* is the current PCM operation for this BE ? */ 117 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe, 118 struct snd_soc_pcm_runtime *be, int stream); 119 120 /* get the substream for this BE */ 121 struct snd_pcm_substream * 122 snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream); 123 124 /* get the BE runtime state */ 125 enum snd_soc_dpcm_state 126 snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream); 127 128 /* set the BE runtime state */ 129 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be, int stream, 130 enum snd_soc_dpcm_state state); 131 132 /* internal use only */ 133 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute); 134 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd); 135 int soc_dpcm_runtime_update(struct snd_soc_dapm_widget *); 136 137 #endif 138