110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
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/*
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* linux/sound/soc-dpcm.h -- ALSA SoC Dynamic PCM Support
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*
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* Author: Liam Girdwood <lrg@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __LINUX_SND_SOC_DPCM_H
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#define __LINUX_SND_SOC_DPCM_H
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#include <sound/pcm.h>
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/*
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* Types of runtime_update to perform (e.g. originated from FE PCM ops
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* or audio route changes triggered by muxes/mixers.
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*/
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#define SND_SOC_DPCM_UPDATE_NO 0
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#define SND_SOC_DPCM_UPDATE_BE 1
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#define SND_SOC_DPCM_UPDATE_FE 2
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/*
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* Dynamic PCM Frontend -> Backend link state.
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*/
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enum snd_soc_dpcm_link_state {
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SND_SOC_DPCM_LINK_STATE_NEW = 0, /* newly created path */
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SND_SOC_DPCM_LINK_STATE_FREE, /* path to be dismantled */
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};
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/*
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* Dynamic PCM params link
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* This links together a FE and BE DAI at runtime and stores the link
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* state information and the hw_params configuration.
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*/
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struct snd_soc_dpcm_params {
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/* FE and BE DAIs*/
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struct snd_soc_pcm_runtime *be;
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struct snd_soc_pcm_runtime *fe;
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/* link state */
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enum snd_soc_dpcm_link_state state;
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struct list_head list_be;
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struct list_head list_fe;
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/* hw params for this link - may be different for each link */
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struct snd_pcm_hw_params hw_params;
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#ifdef CONFIG_DEBUG_FS
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struct dentry *debugfs_state;
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#endif
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};
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/*
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* Bespoke Trigger() Helper API
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*/
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/* is the PCM operation for this FE ? */
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static inline int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe,
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int stream)
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{
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return (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE);
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}
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/* is the PCM operation for this BE ? */
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static inline int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
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struct snd_soc_pcm_runtime *be, int stream)
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{
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if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) ||
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((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) &&
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be->dpcm[stream].runtime_update))
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return 1;
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else
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return 0;
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}
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/* trigger platform driver only */
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static inline int
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snd_soc_dpcm_platform_trigger(struct snd_pcm_substream *substream,
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int cmd, struct snd_soc_platform *platform)
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{
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if (platform->driver->ops->trigger)
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return platform->driver->ops->trigger(substream, cmd);
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return 0;
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}
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int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
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struct snd_soc_pcm_runtime *be, int stream);
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static inline struct snd_pcm_substream *
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snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream)
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{
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return be->pcm->streams[stream].substream;
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}
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static inline enum snd_soc_dpcm_state
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snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream)
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{
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return be->dpcm[stream].state;
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}
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static inline void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be,
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int stream, enum snd_soc_dpcm_state state)
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{
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be->dpcm[stream].state = state;
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}
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#endif
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