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/*
* 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
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