| /* |
| * 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 <sound/pcm.h> |
| |
| /* |
| * Types of runtime_update to perform (e.g. originated from FE PCM ops |
| * or audio route changes triggered by muxes/mixers. |
| */ |
| #define SND_SOC_DPCM_UPDATE_NO 0 |
| #define SND_SOC_DPCM_UPDATE_BE 1 |
| #define SND_SOC_DPCM_UPDATE_FE 2 |
| |
| /* |
| * Dynamic PCM Frontend -> Backend link state. |
| */ |
| enum snd_soc_dpcm_link_state { |
| SND_SOC_DPCM_LINK_STATE_NEW = 0, /* newly created path */ |
| SND_SOC_DPCM_LINK_STATE_FREE, /* path to be dismantled */ |
| }; |
| |
| /* |
| * Dynamic PCM params 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_params { |
| /* 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; |
| |
| 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; |
| |
| #ifdef CONFIG_DEBUG_FS |
| struct dentry *debugfs_state; |
| #endif |
| }; |
| |
| /* |
| * Bespoke Trigger() Helper API |
| */ |
| |
| /* is the PCM operation for this FE ? */ |
| static inline int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, |
| int stream) |
| { |
| return (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE); |
| } |
| |
| /* is the PCM operation for this BE ? */ |
| static inline int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe, |
| struct snd_soc_pcm_runtime *be, int stream) |
| { |
| if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) || |
| ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) && |
| be->dpcm[stream].runtime_update)) |
| return 1; |
| else |
| return 0; |
| } |
| |
| /* trigger platform driver only */ |
| static inline int |
| snd_soc_dpcm_platform_trigger(struct snd_pcm_substream *substream, |
| int cmd, struct snd_soc_platform *platform) |
| { |
| if (platform->driver->ops->trigger) |
| return platform->driver->ops->trigger(substream, cmd); |
| return 0; |
| } |
| |
| int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe, |
| struct snd_soc_pcm_runtime *be, int stream); |
| |
| static inline struct snd_pcm_substream * |
| snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream) |
| { |
| return be->pcm->streams[stream].substream; |
| } |
| |
| static inline enum snd_soc_dpcm_state |
| snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream) |
| { |
| return be->dpcm[stream].state; |
| } |
| |
| static inline void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be, |
| int stream, enum snd_soc_dpcm_state state) |
| { |
| be->dpcm[stream].state = state; |
| } |
| #endif |