1/*
  2 * linux/sound/soc-dpcm.h -- ALSA SoC Dynamic PCM Support
  3 *
  4 * Author:		Liam Girdwood <lrg@ti.com>
  5 *
  6 * This program is free software; you can redistribute it and/or modify
  7 * it under the terms of the GNU General Public License version 2 as
  8 * published by the Free Software Foundation.
  9 */
 10
 11#ifndef __LINUX_SND_SOC_DPCM_H
 12#define __LINUX_SND_SOC_DPCM_H
 13
 14#include <linux/slab.h>
 15#include <linux/list.h>
 16#include <sound/pcm.h>
 17
 18struct snd_soc_pcm_runtime;
 19
 20/*
 21 * Types of runtime_update to perform. e.g. originated from FE PCM ops
 22 * or audio route changes triggered by muxes/mixers.
 23 */
 24enum snd_soc_dpcm_update {
 25	SND_SOC_DPCM_UPDATE_NO	= 0,
 26	SND_SOC_DPCM_UPDATE_BE,
 27	SND_SOC_DPCM_UPDATE_FE,
 28};
 29
 30/*
 31 * Dynamic PCM Frontend -> Backend link management states.
 32 */
 33enum snd_soc_dpcm_link_state {
 34	SND_SOC_DPCM_LINK_STATE_NEW	= 0,	/* newly created link */
 35	SND_SOC_DPCM_LINK_STATE_FREE,		/* link to be dismantled */
 36};
 37
 38/*
 39 * Dynamic PCM Frontend -> Backend link PCM states.
 40 */
 41enum snd_soc_dpcm_state {
 42	SND_SOC_DPCM_STATE_NEW	= 0,
 43	SND_SOC_DPCM_STATE_OPEN,
 44	SND_SOC_DPCM_STATE_HW_PARAMS,
 45	SND_SOC_DPCM_STATE_PREPARE,
 46	SND_SOC_DPCM_STATE_START,
 47	SND_SOC_DPCM_STATE_STOP,
 48	SND_SOC_DPCM_STATE_PAUSED,
 49	SND_SOC_DPCM_STATE_SUSPEND,
 50	SND_SOC_DPCM_STATE_HW_FREE,
 51	SND_SOC_DPCM_STATE_CLOSE,
 52};
 53
 54/*
 55 * Dynamic PCM trigger ordering. Triggering flexibility is required as some
 56 * DSPs require triggering before/after their CPU platform and DAIs.
 57 *
 58 * i.e. some clients may want to manually order this call in their PCM
 59 * trigger() whilst others will just use the regular core ordering.
 60 */
 61enum snd_soc_dpcm_trigger {
 62	SND_SOC_DPCM_TRIGGER_PRE		= 0,
 63	SND_SOC_DPCM_TRIGGER_POST,
 64	SND_SOC_DPCM_TRIGGER_BESPOKE,
 65};
 66
 67/*
 68 * Dynamic PCM link
 69 * This links together a FE and BE DAI at runtime and stores the link
 70 * state information and the hw_params configuration.
 71 */
 72struct snd_soc_dpcm {
 73	/* FE and BE DAIs*/
 74	struct snd_soc_pcm_runtime *be;
 75	struct snd_soc_pcm_runtime *fe;
 76
 77	/* link state */
 78	enum snd_soc_dpcm_link_state state;
 79
 80	/* list of BE and FE for this DPCM link */
 81	struct list_head list_be;
 82	struct list_head list_fe;
 83
 84	/* hw params for this link - may be different for each link */
 85	struct snd_pcm_hw_params hw_params;
 86#ifdef CONFIG_DEBUG_FS
 87	struct dentry *debugfs_state;
 88#endif
 89};
 90
 91/*
 92 * Dynamic PCM runtime data.
 93 */
 94struct snd_soc_dpcm_runtime {
 95	struct list_head be_clients;
 96	struct list_head fe_clients;
 97
 98	int users;
 99	struct snd_pcm_runtime *runtime;
100	struct snd_pcm_hw_params hw_params;
101
102	/* state and update */
103	enum snd_soc_dpcm_update runtime_update;
104	enum snd_soc_dpcm_state state;
105
106	int trigger_pending; /* trigger cmd + 1 if pending, 0 if not */
107};
108
109/* can this BE stop and free */
110int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
111		struct snd_soc_pcm_runtime *be, int stream);
112
113/* can this BE perform a hw_params() */
114int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
115		struct snd_soc_pcm_runtime *be, int stream);
116
117/* is the current PCM operation for this FE ? */
118int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream);
119
120/* is the current PCM operation for this BE ? */
121int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
122		struct snd_soc_pcm_runtime *be, int stream);
123
124/* get the substream for this BE */
125struct snd_pcm_substream *
126	snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream);
127
128/* get the BE runtime state */
129enum snd_soc_dpcm_state
130	snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream);
131
132/* set the BE runtime state */
133void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be, int stream,
134	enum snd_soc_dpcm_state state);
135
136/* internal use only */
137int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute);
138void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd);
139int soc_dpcm_runtime_update(struct snd_soc_card *);
140
141int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
142	int stream, struct snd_soc_dapm_widget_list **list_);
143int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
144	int stream, struct snd_soc_dapm_widget_list **list, int new);
145int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream);
146int dpcm_be_dai_shutdown(struct snd_soc_pcm_runtime *fe, int stream);
147void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream);
148void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream);
149int dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream);
150int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int tream);
151int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream, int cmd);
152int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream);
153int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
154	int event);
155
156static inline void dpcm_path_put(struct snd_soc_dapm_widget_list **list)
157{
158	kfree(*list);
159}
160
161
162#endif