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 SND_SOC_DPCM_TRIGGER_BESPOKE, 64 }; 65 66 /* 67 * Dynamic PCM link 68 * This links together a FE and BE DAI at runtime and stores the link 69 * state information and the hw_params configuration. 70 */ 71 struct snd_soc_dpcm { 72 /* FE and BE DAIs*/ 73 struct snd_soc_pcm_runtime *be; 74 struct snd_soc_pcm_runtime *fe; 75 76 /* link state */ 77 enum snd_soc_dpcm_link_state state; 78 79 /* list of BE and FE for this DPCM link */ 80 struct list_head list_be; 81 struct list_head list_fe; 82 83 /* hw params for this link - may be different for each link */ 84 struct snd_pcm_hw_params hw_params; 85 #ifdef CONFIG_DEBUG_FS 86 struct dentry *debugfs_state; 87 #endif 88 }; 89 90 /* 91 * Dynamic PCM runtime data. 92 */ 93 struct snd_soc_dpcm_runtime { 94 struct list_head be_clients; 95 struct list_head fe_clients; 96 97 int users; 98 struct snd_pcm_runtime *runtime; 99 struct snd_pcm_hw_params hw_params; 100 101 /* state and update */ 102 enum snd_soc_dpcm_update runtime_update; 103 enum snd_soc_dpcm_state state; 104 }; 105 106 /* can this BE stop and free */ 107 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe, 108 struct snd_soc_pcm_runtime *be, int stream); 109 110 /* can this BE perform a hw_params() */ 111 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe, 112 struct snd_soc_pcm_runtime *be, int stream); 113 114 /* is the current PCM operation for this FE ? */ 115 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream); 116 117 /* is the current PCM operation for this BE ? */ 118 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe, 119 struct snd_soc_pcm_runtime *be, int stream); 120 121 /* get the substream for this BE */ 122 struct snd_pcm_substream * 123 snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream); 124 125 /* get the BE runtime state */ 126 enum snd_soc_dpcm_state 127 snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream); 128 129 /* set the BE runtime state */ 130 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be, int stream, 131 enum snd_soc_dpcm_state state); 132 133 /* internal use only */ 134 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute); 135 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd); 136 int soc_dpcm_runtime_update(struct snd_soc_card *); 137 138 #endif 139