diff options
Diffstat (limited to 'include/sound/soc-dpcm.h')
| -rw-r--r-- | include/sound/soc-dpcm.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/include/sound/soc-dpcm.h b/include/sound/soc-dpcm.h new file mode 100644 index 000000000000..cd72c1090586 --- /dev/null +++ b/include/sound/soc-dpcm.h @@ -0,0 +1,132 @@ +/* + * 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 |