2 * linux/sound/soc-dpcm.h -- ALSA SoC Dynamic PCM Support
4 * Author: Liam Girdwood <lrg@ti.com>
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.
11 #ifndef __LINUX_SND_SOC_DPCM_H
12 #define __LINUX_SND_SOC_DPCM_H
14 #include <linux/list.h>
15 #include <sound/pcm.h>
17 struct snd_soc_pcm_runtime;
20 * Types of runtime_update to perform. e.g. originated from FE PCM ops
21 * or audio route changes triggered by muxes/mixers.
23 enum snd_soc_dpcm_update {
24 SND_SOC_DPCM_UPDATE_NO = 0,
25 SND_SOC_DPCM_UPDATE_BE,
26 SND_SOC_DPCM_UPDATE_FE,
30 * Dynamic PCM Frontend -> Backend link management states.
32 enum snd_soc_dpcm_link_state {
33 SND_SOC_DPCM_LINK_STATE_NEW = 0, /* newly created link */
34 SND_SOC_DPCM_LINK_STATE_FREE, /* link to be dismantled */
38 * Dynamic PCM Frontend -> Backend link PCM states.
40 enum snd_soc_dpcm_state {
41 SND_SOC_DPCM_STATE_NEW = 0,
42 SND_SOC_DPCM_STATE_OPEN,
43 SND_SOC_DPCM_STATE_HW_PARAMS,
44 SND_SOC_DPCM_STATE_PREPARE,
45 SND_SOC_DPCM_STATE_START,
46 SND_SOC_DPCM_STATE_STOP,
47 SND_SOC_DPCM_STATE_PAUSED,
48 SND_SOC_DPCM_STATE_SUSPEND,
49 SND_SOC_DPCM_STATE_HW_FREE,
50 SND_SOC_DPCM_STATE_CLOSE,
54 * Dynamic PCM trigger ordering. Triggering flexibility is required as some
55 * DSPs require triggering before/after their CPU platform and DAIs.
57 * i.e. some clients may want to manually order this call in their PCM
58 * trigger() whilst others will just use the regular core ordering.
60 enum snd_soc_dpcm_trigger {
61 SND_SOC_DPCM_TRIGGER_PRE = 0,
62 SND_SOC_DPCM_TRIGGER_POST,
67 * This links together a FE and BE DAI at runtime and stores the link
68 * state information and the hw_params configuration.
72 struct snd_soc_pcm_runtime *be;
73 struct snd_soc_pcm_runtime *fe;
76 enum snd_soc_dpcm_link_state state;
78 /* list of BE and FE for this DPCM link */
79 struct list_head list_be;
80 struct list_head list_fe;
82 /* hw params for this link - may be different for each link */
83 struct snd_pcm_hw_params hw_params;
87 * Dynamic PCM runtime data.
89 struct snd_soc_dpcm_runtime {
90 struct list_head be_clients;
91 struct list_head fe_clients;
94 struct snd_pcm_runtime *runtime;
95 struct snd_pcm_hw_params hw_params;
97 /* state and update */
98 enum snd_soc_dpcm_update runtime_update;
99 enum snd_soc_dpcm_state state;
102 /* can this BE stop and free */
103 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
104 struct snd_soc_pcm_runtime *be, int stream);
106 /* can this BE perform a hw_params() */
107 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
108 struct snd_soc_pcm_runtime *be, int stream);
110 /* is the current PCM operation for this FE ? */
111 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream);
113 /* is the current PCM operation for this BE ? */
114 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
115 struct snd_soc_pcm_runtime *be, int stream);
117 /* get the substream for this BE */
118 struct snd_pcm_substream *
119 snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream);
121 /* get the BE runtime state */
122 enum snd_soc_dpcm_state
123 snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream);
125 /* set the BE runtime state */
126 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be, int stream,
127 enum snd_soc_dpcm_state state);
129 /* internal use only */
130 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute);