1 /*
2  * hdmi-codec.h - HDMI Codec driver API
3  *
4  * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
5  *
6  * Author: Jyri Sarha <jsarha@ti.com>
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License
10  * version 2 as published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * General Public License for more details.
16  */
17 
18 #ifndef __HDMI_CODEC_H__
19 #define __HDMI_CODEC_H__
20 
21 #include <linux/of_graph.h>
22 #include <linux/hdmi.h>
23 #include <drm/drm_edid.h>
24 #include <sound/asoundef.h>
25 #include <sound/soc.h>
26 #include <uapi/sound/asound.h>
27 
28 /*
29  * Protocol between ASoC cpu-dai and HDMI-encoder
30  */
31 struct hdmi_codec_daifmt {
32 	enum {
33 		HDMI_I2S,
34 		HDMI_RIGHT_J,
35 		HDMI_LEFT_J,
36 		HDMI_DSP_A,
37 		HDMI_DSP_B,
38 		HDMI_AC97,
39 		HDMI_SPDIF,
40 	} fmt;
41 	unsigned int bit_clk_inv:1;
42 	unsigned int frame_clk_inv:1;
43 	unsigned int bit_clk_master:1;
44 	unsigned int frame_clk_master:1;
45 };
46 
47 /*
48  * HDMI audio parameters
49  */
50 struct hdmi_codec_params {
51 	struct hdmi_audio_infoframe cea;
52 	struct snd_aes_iec958 iec;
53 	int sample_rate;
54 	int sample_width;
55 	int channels;
56 };
57 
58 struct hdmi_codec_pdata;
59 struct hdmi_codec_ops {
60 	/*
61 	 * Called when ASoC starts an audio stream setup.
62 	 * Optional
63 	 */
64 	int (*audio_startup)(struct device *dev, void *data);
65 
66 	/*
67 	 * Configures HDMI-encoder for audio stream.
68 	 * Mandatory
69 	 */
70 	int (*hw_params)(struct device *dev, void *data,
71 			 struct hdmi_codec_daifmt *fmt,
72 			 struct hdmi_codec_params *hparms);
73 
74 	/*
75 	 * Shuts down the audio stream.
76 	 * Mandatory
77 	 */
78 	void (*audio_shutdown)(struct device *dev, void *data);
79 
80 	/*
81 	 * Mute/unmute HDMI audio stream.
82 	 * Optional
83 	 */
84 	int (*digital_mute)(struct device *dev, void *data, bool enable);
85 
86 	/*
87 	 * Provides EDID-Like-Data from connected HDMI device.
88 	 * Optional
89 	 */
90 	int (*get_eld)(struct device *dev, void *data,
91 		       uint8_t *buf, size_t len);
92 
93 	/*
94 	 * Getting DAI ID
95 	 * Optional
96 	 */
97 	int (*get_dai_id)(struct snd_soc_component *comment,
98 			  struct device_node *endpoint);
99 };
100 
101 /* HDMI codec initalization data */
102 struct hdmi_codec_pdata {
103 	const struct hdmi_codec_ops *ops;
104 	uint i2s:1;
105 	uint spdif:1;
106 	int max_i2s_channels;
107 	void *data;
108 };
109 
110 #define HDMI_CODEC_DRV_NAME "hdmi-audio-codec"
111 
112 #endif /* __HDMI_CODEC_H__ */
113