1/* SPDX-License-Identifier: GPL-2.0
2 *
3 * linux/sound/soc-dpcm.h -- ALSA SoC Dynamic PCM Support
4 *
5 * Author: Liam Girdwood <lrg@ti.com>
6 */
7
8#ifndef __LINUX_SND_SOC_DPCM_H
9#define __LINUX_SND_SOC_DPCM_H
10
11#include <linux/slab.h>
12#include <linux/list.h>
13#include <sound/pcm.h>
14
15struct snd_soc_pcm_runtime;
16
17/*
18 * Types of runtime_update to perform. e.g. originated from FE PCM ops
19 * or audio route changes triggered by muxes/mixers.
20 */
21enum snd_soc_dpcm_update {
22 SND_SOC_DPCM_UPDATE_NO = 0,
23 SND_SOC_DPCM_UPDATE_BE,
24 SND_SOC_DPCM_UPDATE_FE,
25};
26
27/*
28 * Dynamic PCM Frontend -> Backend link management states.
29 */
30enum snd_soc_dpcm_link_state {
31 SND_SOC_DPCM_LINK_STATE_NEW = 0, /* newly created link */
32 SND_SOC_DPCM_LINK_STATE_FREE, /* link to be dismantled */
33};
34
35/*
36 * Dynamic PCM Frontend -> Backend link PCM states.
37 */
38enum snd_soc_dpcm_state {
39 SND_SOC_DPCM_STATE_NEW = 0,
40 SND_SOC_DPCM_STATE_OPEN,
41 SND_SOC_DPCM_STATE_HW_PARAMS,
42 SND_SOC_DPCM_STATE_PREPARE,
43 SND_SOC_DPCM_STATE_START,
44 SND_SOC_DPCM_STATE_STOP,
45 SND_SOC_DPCM_STATE_PAUSED,
46 SND_SOC_DPCM_STATE_SUSPEND,
47 SND_SOC_DPCM_STATE_HW_FREE,
48 SND_SOC_DPCM_STATE_CLOSE,
49};
50
51/*
52 * Dynamic PCM trigger ordering. Triggering flexibility is required as some
53 * DSPs require triggering before/after their CPU platform and DAIs.
54 *
55 * i.e. some clients may want to manually order this call in their PCM
56 * trigger() whilst others will just use the regular core ordering.
57 */
58enum snd_soc_dpcm_trigger {
59 SND_SOC_DPCM_TRIGGER_PRE = 0,
60 SND_SOC_DPCM_TRIGGER_POST,
61};
62
63/*
64 * Dynamic PCM link
65 * This links together a FE and BE DAI at runtime and stores the link
66 * state information and the hw_params configuration.
67 */
68struct snd_soc_dpcm {
69 /* FE and BE DAIs*/
70 struct snd_soc_pcm_runtime *be;
71 struct snd_soc_pcm_runtime *fe;
72
73 /* link state */
74 enum snd_soc_dpcm_link_state state;
75
76 /* list of BE and FE for this DPCM link */
77 struct list_head list_be;
78 struct list_head list_fe;
79
80#ifdef CONFIG_DEBUG_FS
81 struct dentry *debugfs_state;
82#endif
83};
84
85/*
86 * Dynamic PCM runtime data.
87 */
88struct snd_soc_dpcm_runtime {
89 struct list_head be_clients;
90 struct list_head fe_clients;
91
92 int users;
93 struct snd_pcm_hw_params hw_params;
94
95 /* state and update */
96 enum snd_soc_dpcm_update runtime_update;
97 enum snd_soc_dpcm_state state;
98
99 int trigger_pending; /* trigger cmd + 1 if pending, 0 if not */
100
101 int be_start; /* refcount protected by BE stream pcm lock */
102 int be_pause; /* refcount protected by BE stream pcm lock */
103 bool fe_pause; /* used to track STOP after PAUSE */
104};
105
106#define for_each_dpcm_fe(be, stream, _dpcm) \
107 list_for_each_entry(_dpcm, &(be)->dpcm[stream].fe_clients, list_fe)
108
109#define for_each_dpcm_be(fe, stream, _dpcm) \
110 list_for_each_entry(_dpcm, &(fe)->dpcm[stream].be_clients, list_be)
111#define for_each_dpcm_be_safe(fe, stream, _dpcm, __dpcm) \
112 list_for_each_entry_safe(_dpcm, __dpcm, &(fe)->dpcm[stream].be_clients, list_be)
113#define for_each_dpcm_be_rollback(fe, stream, _dpcm) \
114 list_for_each_entry_continue_reverse(_dpcm, &(fe)->dpcm[stream].be_clients, list_be)
115
116
117/* get the substream for this BE */
118struct snd_pcm_substream *
119 snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream);
120
121/* update audio routing between PCMs and any DAI links */
122int snd_soc_dpcm_runtime_update(struct snd_soc_card *card);
123
124#ifdef CONFIG_DEBUG_FS
125void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd);
126#else
127static inline void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
128{
129}
130#endif
131
132int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
133 int stream, struct snd_soc_dapm_widget_list **list_);
134void dpcm_path_put(struct snd_soc_dapm_widget_list **list);
135int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream,
136 struct snd_soc_dapm_widget_list **list_);
137int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream);
138void dpcm_be_dai_stop(struct snd_soc_pcm_runtime *fe, int stream,
139 int do_hw_free, struct snd_soc_dpcm *last);
140void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream);
141void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream);
142void dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream);
143int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int tream);
144int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream, int cmd);
145int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream);
146void dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir, int event);
147
148bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget, enum snd_soc_dapm_direction dir);
149int widget_in_list(struct snd_soc_dapm_widget_list *list,
150 struct snd_soc_dapm_widget *widget);
151
152#define dpcm_be_dai_startup_rollback(fe, stream, last) \
153 dpcm_be_dai_stop(fe, stream, 0, last)
154#define dpcm_be_dai_startup_unwind(fe, stream) dpcm_be_dai_stop(fe, stream, 0, NULL)
155#define dpcm_be_dai_shutdown(fe, stream) dpcm_be_dai_stop(fe, stream, 1, NULL)
156
157#endif
158

source code of linux/include/sound/soc-dpcm.h