| /* |
| * linux/sound/soc-dpcm.h -- ALSA SoC Dynamic PCM Support |
| * |
| * Author: Liam Girdwood <lrg@ti.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #ifndef __LINUX_SND_SOC_DPCM_H |
| #define __LINUX_SND_SOC_DPCM_H |
| |
| #include <linux/list.h> |
| #include <sound/pcm.h> |
| |
| struct snd_soc_pcm_runtime; |
| |
| /* |
| * Types of runtime_update to perform. e.g. originated from FE PCM ops |
| * or audio route changes triggered by muxes/mixers. |
| */ |
| enum snd_soc_dpcm_update { |
| SND_SOC_DPCM_UPDATE_NO = 0, |
| SND_SOC_DPCM_UPDATE_BE, |
| SND_SOC_DPCM_UPDATE_FE, |
| }; |
| |
| /* |
| * Dynamic PCM Frontend -> Backend link management states. |
| */ |
| enum snd_soc_dpcm_link_state { |
| SND_SOC_DPCM_LINK_STATE_NEW = 0, /* newly created link */ |
| SND_SOC_DPCM_LINK_STATE_FREE, /* link to be dismantled */ |
| }; |
| |
| /* |
| * Dynamic PCM Frontend -> Backend link PCM states. |
| */ |
| enum snd_soc_dpcm_state { |
| SND_SOC_DPCM_STATE_NEW = 0, |
| SND_SOC_DPCM_STATE_OPEN, |
| SND_SOC_DPCM_STATE_HW_PARAMS, |
| SND_SOC_DPCM_STATE_PREPARE, |
| SND_SOC_DPCM_STATE_START, |
| SND_SOC_DPCM_STATE_STOP, |
| SND_SOC_DPCM_STATE_PAUSED, |
| SND_SOC_DPCM_STATE_SUSPEND, |
| SND_SOC_DPCM_STATE_HW_FREE, |
| SND_SOC_DPCM_STATE_CLOSE, |
| }; |
| |
| /* |
| * Dynamic PCM trigger ordering. Triggering flexibility is required as some |
| * DSPs require triggering before/after their CPU platform and DAIs. |
| * |
| * i.e. some clients may want to manually order this call in their PCM |
| * trigger() whilst others will just use the regular core ordering. |
| */ |
| enum snd_soc_dpcm_trigger { |
| SND_SOC_DPCM_TRIGGER_PRE = 0, |
| SND_SOC_DPCM_TRIGGER_POST, |
| }; |
| |
| /* |
| * Dynamic PCM link |
| * This links together a FE and BE DAI at runtime and stores the link |
| * state information and the hw_params configuration. |
| */ |
| struct snd_soc_dpcm { |
| /* FE and BE DAIs*/ |
| struct snd_soc_pcm_runtime *be; |
| struct snd_soc_pcm_runtime *fe; |
| |
| /* link state */ |
| enum snd_soc_dpcm_link_state state; |
| |
| /* list of BE and FE for this DPCM link */ |
| struct list_head list_be; |
| struct list_head list_fe; |
| |
| /* hw params for this link - may be different for each link */ |
| struct snd_pcm_hw_params hw_params; |
| }; |
| |
| /* |
| * Dynamic PCM runtime data. |
| */ |
| struct snd_soc_dpcm_runtime { |
| struct list_head be_clients; |
| struct list_head fe_clients; |
| |
| int users; |
| struct snd_pcm_runtime *runtime; |
| struct snd_pcm_hw_params hw_params; |
| |
| /* state and update */ |
| enum snd_soc_dpcm_update runtime_update; |
| enum snd_soc_dpcm_state state; |
| }; |
| |
| /* can this BE stop and free */ |
| int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe, |
| struct snd_soc_pcm_runtime *be, int stream); |
| |
| /* can this BE perform a hw_params() */ |
| int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe, |
| struct snd_soc_pcm_runtime *be, int stream); |
| |
| /* is the current PCM operation for this FE ? */ |
| int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream); |
| |
| /* 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); |
| |
| /* get the substream for this BE */ |
| struct snd_pcm_substream * |
| snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream); |
| |
| /* get the BE runtime state */ |
| enum snd_soc_dpcm_state |
| snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream); |
| |
| /* set the BE runtime state */ |
| void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be, int stream, |
| enum snd_soc_dpcm_state state); |
| |
| /* internal use only */ |
| int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute); |
| |
| #endif |