xref: /linux/include/sound/hdmi-codec.h (revision b7e1e969c887c897947fdc3754fe9b0c24acb155)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * hdmi-codec.h - HDMI Codec driver API
4  *
5  * Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com
6  *
7  * Author: Jyri Sarha <jsarha@ti.com>
8  */
9 
10 #ifndef __HDMI_CODEC_H__
11 #define __HDMI_CODEC_H__
12 
13 #include <linux/of_graph.h>
14 #include <linux/hdmi.h>
15 #include <sound/asoundef.h>
16 #include <sound/soc.h>
17 #include <uapi/sound/asound.h>
18 
19 /*
20  * Protocol between ASoC cpu-dai and HDMI-encoder
21  */
22 struct hdmi_codec_daifmt {
23 	enum {
24 		HDMI_I2S,
25 		HDMI_RIGHT_J,
26 		HDMI_LEFT_J,
27 		HDMI_DSP_A,
28 		HDMI_DSP_B,
29 		HDMI_AC97,
30 		HDMI_SPDIF,
31 	} fmt;
32 	unsigned int bit_clk_inv:1;
33 	unsigned int frame_clk_inv:1;
34 	unsigned int bit_clk_provider:1;
35 	unsigned int frame_clk_provider:1;
36 	/* bit_fmt could be standard PCM format or
37 	 * IEC958 encoded format. ALSA IEC958 plugin will pass
38 	 * IEC958_SUBFRAME format to the underneath driver.
39 	 */
40 	snd_pcm_format_t bit_fmt;
41 };
42 
43 /*
44  * HDMI audio parameters
45  */
46 struct hdmi_codec_params {
47 	struct hdmi_audio_infoframe cea;
48 	struct snd_aes_iec958 iec;
49 	int sample_rate;
50 	int sample_width;
51 	int channels;
52 };
53 
54 typedef void (*hdmi_codec_plugged_cb)(struct device *dev,
55 				      bool plugged);
56 
57 struct hdmi_codec_pdata;
58 struct hdmi_codec_ops {
59 	/*
60 	 * Called when ASoC starts an audio stream setup.
61 	 * Optional
62 	 */
63 	int (*audio_startup)(struct device *dev, void *data);
64 
65 	/*
66 	 * Configures HDMI-encoder for audio stream.
67 	 * Having either prepare or hw_params is mandatory.
68 	 */
69 	int (*hw_params)(struct device *dev, void *data,
70 			 struct hdmi_codec_daifmt *fmt,
71 			 struct hdmi_codec_params *hparms);
72 
73 	/*
74 	 * Configures HDMI-encoder for audio stream. Can be called
75 	 * multiple times for each setup.
76 	 *
77 	 * Having either prepare or hw_params is mandatory.
78 	 */
79 	int (*prepare)(struct device *dev, void *data,
80 		       struct hdmi_codec_daifmt *fmt,
81 		       struct hdmi_codec_params *hparms);
82 
83 	/*
84 	 * Shuts down the audio stream.
85 	 * Mandatory
86 	 */
87 	void (*audio_shutdown)(struct device *dev, void *data);
88 
89 	/*
90 	 * Mute/unmute HDMI audio stream.
91 	 * Optional
92 	 */
93 	int (*mute_stream)(struct device *dev, void *data,
94 			   bool enable, int direction);
95 
96 	/*
97 	 * Provides EDID-Like-Data from connected HDMI device.
98 	 * Optional
99 	 */
100 	int (*get_eld)(struct device *dev, void *data,
101 		       uint8_t *buf, size_t len);
102 
103 	/*
104 	 * Getting DAI ID
105 	 * Optional
106 	 */
107 	int (*get_dai_id)(struct snd_soc_component *comment,
108 			  struct device_node *endpoint);
109 
110 	/*
111 	 * Hook callback function to handle connector plug event.
112 	 * Optional
113 	 */
114 	int (*hook_plugged_cb)(struct device *dev, void *data,
115 			       hdmi_codec_plugged_cb fn,
116 			       struct device *codec_dev);
117 
118 	/* bit field */
119 	unsigned int no_capture_mute:1;
120 };
121 
122 /* HDMI codec initalization data */
123 struct hdmi_codec_pdata {
124 	const struct hdmi_codec_ops *ops;
125 	uint i2s:1;
126 	uint no_i2s_playback:1;
127 	uint no_i2s_capture:1;
128 	uint spdif:1;
129 	uint no_spdif_playback:1;
130 	uint no_spdif_capture:1;
131 	int max_i2s_channels;
132 	void *data;
133 };
134 
135 struct snd_soc_component;
136 struct snd_soc_jack;
137 
138 #define HDMI_CODEC_DRV_NAME "hdmi-audio-codec"
139 
140 #endif /* __HDMI_CODEC_H__ */
141