07bf84aaf7
Some on SoC DSP HW is very tightly coupled with DMA and DAI drivers. It's necessary to allow some flexability wrt to PCM operations here so that we can define a bespoke DPCM trigger() PCM operation for such HW. A bespoke DPCM trigger() allows exact ordering and timing of component triggering by allowing a component driver to manage the final enable and disable configurations without adding extra complexity to other component drivers. e.g. The McPDM DAI and ABE are tightly coupled on OMAP4 so we have a bespoke trigger to manage the trigger to improve performance and reduce complexity when triggering new McPDM BEs. Signed-off-by: Liam Girdwood <lrg@ti.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
139 lines
3.7 KiB
C
139 lines
3.7 KiB
C
/*
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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 <linux/list.h>
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#include <sound/pcm.h>
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struct snd_soc_pcm_runtime;
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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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enum snd_soc_dpcm_update {
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SND_SOC_DPCM_UPDATE_NO = 0,
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SND_SOC_DPCM_UPDATE_BE,
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SND_SOC_DPCM_UPDATE_FE,
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};
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/*
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* Dynamic PCM Frontend -> Backend link management states.
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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 link */
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SND_SOC_DPCM_LINK_STATE_FREE, /* link to be dismantled */
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};
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/*
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* Dynamic PCM Frontend -> Backend link PCM states.
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*/
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enum snd_soc_dpcm_state {
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SND_SOC_DPCM_STATE_NEW = 0,
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SND_SOC_DPCM_STATE_OPEN,
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SND_SOC_DPCM_STATE_HW_PARAMS,
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SND_SOC_DPCM_STATE_PREPARE,
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SND_SOC_DPCM_STATE_START,
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SND_SOC_DPCM_STATE_STOP,
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SND_SOC_DPCM_STATE_PAUSED,
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SND_SOC_DPCM_STATE_SUSPEND,
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SND_SOC_DPCM_STATE_HW_FREE,
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SND_SOC_DPCM_STATE_CLOSE,
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};
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/*
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* Dynamic PCM trigger ordering. Triggering flexibility is required as some
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* DSPs require triggering before/after their CPU platform and DAIs.
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*
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* i.e. some clients may want to manually order this call in their PCM
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* trigger() whilst others will just use the regular core ordering.
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*/
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enum snd_soc_dpcm_trigger {
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SND_SOC_DPCM_TRIGGER_PRE = 0,
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SND_SOC_DPCM_TRIGGER_POST,
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SND_SOC_DPCM_TRIGGER_BESPOKE,
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};
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/*
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* Dynamic PCM 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 {
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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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/* list of BE and FE for this DPCM link */
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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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* Dynamic PCM runtime data.
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*/
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struct snd_soc_dpcm_runtime {
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struct list_head be_clients;
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struct list_head fe_clients;
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int users;
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struct snd_pcm_runtime *runtime;
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struct snd_pcm_hw_params hw_params;
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/* state and update */
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enum snd_soc_dpcm_update runtime_update;
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enum snd_soc_dpcm_state state;
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};
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/* can this BE stop and free */
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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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/* can this BE perform a hw_params() */
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int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
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struct snd_soc_pcm_runtime *be, int stream);
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/* is the current PCM operation for this FE ? */
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int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream);
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/* is the current PCM operation for this BE ? */
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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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/* get the substream for this BE */
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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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/* get the BE runtime state */
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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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/* set the BE runtime state */
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void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be, int stream,
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enum snd_soc_dpcm_state state);
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/* internal use only */
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int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute);
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int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd);
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int soc_dpcm_runtime_update(struct snd_soc_dapm_widget *);
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#endif
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