1 ====================
2 ASoC Platform Driver
3 ====================
4
5 An ASoC platform driver class can be divided i
6 drivers and DSP drivers. The platform drivers
7 have no board specific code.
8
9 Audio DMA
10 =========
11
12 The platform DMA driver optionally supports th
13 ::
14
15 /* SoC audio ops */
16 struct snd_soc_ops {
17 int (*startup)(struct snd_pcm_substrea
18 void (*shutdown)(struct snd_pcm_substr
19 int (*hw_params)(struct snd_pcm_substr
20 int (*hw_free)(struct snd_pcm_substrea
21 int (*prepare)(struct snd_pcm_substrea
22 int (*trigger)(struct snd_pcm_substrea
23 };
24
25 The platform driver exports its DMA functional
26 snd_soc_component_driver:-
27 ::
28
29 struct snd_soc_component_driver {
30 const char *name;
31
32 ...
33 int (*probe)(struct snd_soc_component
34 void (*remove)(struct snd_soc_componen
35 int (*suspend)(struct snd_soc_componen
36 int (*resume)(struct snd_soc_component
37
38 /* pcm creation and destruction */
39 int (*pcm_new)(struct snd_soc_pcm_runt
40 void (*pcm_free)(struct snd_pcm *);
41
42 ...
43 const struct snd_pcm_ops *ops;
44 const struct snd_compr_ops *compr_ops;
45 ...
46 };
47
48 Please refer to the ALSA driver documentation
49 https://www.kernel.org/doc/html/latest/sound/k
50
51 An example DMA driver is soc/pxa/pxa2xx-pcm.c
52
53
54 SoC DAI Drivers
55 ===============
56
57 Each SoC DAI driver must provide the following
58
59 1. Digital audio interface (DAI) description
60 2. Digital audio interface configuration
61 3. PCM's description
62 4. SYSCLK configuration
63 5. Suspend and resume (optional)
64
65 Please see codec.rst for a description of item
66
67
68 SoC DSP Drivers
69 ===============
70
71 Each SoC DSP driver usually supplies the follo
72
73 1. DAPM graph
74 2. Mixer controls
75 3. DMA IO to/from DSP buffers (if applicable)
76 4. Definition of DSP front end (FE) PCM device
77
78 Please see DPCM.txt for a description of item
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