xref: /linux/include/sound/soc-dpcm.h (revision 26b0d14106954ae46d2f4f7eec3481828a210f7d)
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/list.h>
15 #include <sound/pcm.h>
16 
17 struct snd_soc_pcm_runtime;
18 
19 /*
20  * Types of runtime_update to perform. e.g. originated from FE PCM ops
21  * or audio route changes triggered by muxes/mixers.
22  */
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,
27 };
28 
29 /*
30  * Dynamic PCM Frontend -> Backend link management states.
31  */
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 */
35 };
36 
37 /*
38  * Dynamic PCM Frontend -> Backend link PCM states.
39  */
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,
51 };
52 
53 /*
54  * Dynamic PCM trigger ordering. Triggering flexibility is required as some
55  * DSPs require triggering before/after their CPU platform and DAIs.
56  *
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.
59  */
60 enum snd_soc_dpcm_trigger {
61 	SND_SOC_DPCM_TRIGGER_PRE		= 0,
62 	SND_SOC_DPCM_TRIGGER_POST,
63 	SND_SOC_DPCM_TRIGGER_BESPOKE,
64 };
65 
66 /*
67  * Dynamic PCM link
68  * This links together a FE and BE DAI at runtime and stores the link
69  * state information and the hw_params configuration.
70  */
71 struct snd_soc_dpcm {
72 	/* FE and BE DAIs*/
73 	struct snd_soc_pcm_runtime *be;
74 	struct snd_soc_pcm_runtime *fe;
75 
76 	/* link state */
77 	enum snd_soc_dpcm_link_state state;
78 
79 	/* list of BE and FE for this DPCM link */
80 	struct list_head list_be;
81 	struct list_head list_fe;
82 
83 	/* hw params for this link - may be different for each link */
84 	struct snd_pcm_hw_params hw_params;
85 #ifdef CONFIG_DEBUG_FS
86 	struct dentry *debugfs_state;
87 #endif
88 };
89 
90 /*
91  * Dynamic PCM runtime data.
92  */
93 struct snd_soc_dpcm_runtime {
94 	struct list_head be_clients;
95 	struct list_head fe_clients;
96 
97 	int users;
98 	struct snd_pcm_runtime *runtime;
99 	struct snd_pcm_hw_params hw_params;
100 
101 	/* state and update */
102 	enum snd_soc_dpcm_update runtime_update;
103 	enum snd_soc_dpcm_state state;
104 };
105 
106 /* can this BE stop and free */
107 int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
108 		struct snd_soc_pcm_runtime *be, int stream);
109 
110 /* can this BE perform a hw_params() */
111 int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
112 		struct snd_soc_pcm_runtime *be, int stream);
113 
114 /* is the current PCM operation for this FE ? */
115 int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream);
116 
117 /* is the current PCM operation for this BE ? */
118 int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
119 		struct snd_soc_pcm_runtime *be, int stream);
120 
121 /* get the substream for this BE */
122 struct snd_pcm_substream *
123 	snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream);
124 
125 /* get the BE runtime state */
126 enum snd_soc_dpcm_state
127 	snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream);
128 
129 /* set the BE runtime state */
130 void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be, int stream,
131 	enum snd_soc_dpcm_state state);
132 
133 /* internal use only */
134 int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute);
135 int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd);
136 int soc_dpcm_runtime_update(struct snd_soc_dapm_widget *);
137 
138 #endif
139