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 int 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 163