tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * dw-hdmi-i2s-audio.c
3 *
4 * Copyright (c) 2017 Renesas Solutions Corp.
5 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#include <drm/bridge/dw_hdmi.h>
12
13#include <sound/hdmi-codec.h>
14
15#include "dw-hdmi.h"
16#include "dw-hdmi-audio.h"
17
18#define DRIVER_NAME "dw-hdmi-i2s-audio"
19
20static inline void hdmi_write(struct dw_hdmi_i2s_audio_data *audio,
21 u8 val, int offset)
22{
23 struct dw_hdmi *hdmi = audio->hdmi;
24
25 audio->write(hdmi, val, offset);
26}
27
28static inline u8 hdmi_read(struct dw_hdmi_i2s_audio_data *audio, int offset)
29{
30 struct dw_hdmi *hdmi = audio->hdmi;
31
32 return audio->read(hdmi, offset);
33}
34
35static int dw_hdmi_i2s_hw_params(struct device *dev, void *data,
36 struct hdmi_codec_daifmt *fmt,
37 struct hdmi_codec_params *hparms)
38{
39 struct dw_hdmi_i2s_audio_data *audio = data;
40 struct dw_hdmi *hdmi = audio->hdmi;
41 u8 conf0 = 0;
42 u8 conf1 = 0;
43 u8 inputclkfs = 0;
44
45 /* it cares I2S only */
46 if ((fmt->fmt != HDMI_I2S) ||
47 (fmt->bit_clk_master | fmt->frame_clk_master)) {
48 dev_err(dev, "unsupported format/settings\n");
49 return -EINVAL;
50 }
51
52 inputclkfs = HDMI_AUD_INPUTCLKFS_64FS;
53 conf0 = HDMI_AUD_CONF0_I2S_ALL_ENABLE;
54
55 switch (hparms->sample_width) {
56 case 16:
57 conf1 = HDMI_AUD_CONF1_WIDTH_16;
58 break;
59 case 24:
60 case 32:
61 conf1 = HDMI_AUD_CONF1_WIDTH_24;
62 break;
63 }
64
65 dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate);
66
67 hdmi_write(audio, inputclkfs, HDMI_AUD_INPUTCLKFS);
68 hdmi_write(audio, conf0, HDMI_AUD_CONF0);
69 hdmi_write(audio, conf1, HDMI_AUD_CONF1);
70
71 dw_hdmi_audio_enable(hdmi);
72
73 return 0;
74}
75
76static void dw_hdmi_i2s_audio_shutdown(struct device *dev, void *data)
77{
78 struct dw_hdmi_i2s_audio_data *audio = data;
79 struct dw_hdmi *hdmi = audio->hdmi;
80
81 dw_hdmi_audio_disable(hdmi);
82
83 hdmi_write(audio, HDMI_AUD_CONF0_SW_RESET, HDMI_AUD_CONF0);
84}
85
86static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
87 struct device_node *endpoint)
88{
89 struct of_endpoint of_ep;
90 int ret;
91
92 ret = of_graph_parse_endpoint(endpoint, &of_ep);
93 if (ret < 0)
94 return ret;
95
96 /*
97 * HDMI sound should be located as reg = <2>
98 * Then, it is sound port 0
99 */
100 if (of_ep.port == 2)
101 return 0;
102
103 return -EINVAL;
104}
105
106static struct hdmi_codec_ops dw_hdmi_i2s_ops = {
107 .hw_params = dw_hdmi_i2s_hw_params,
108 .audio_shutdown = dw_hdmi_i2s_audio_shutdown,
109 .get_dai_id = dw_hdmi_i2s_get_dai_id,
110};
111
112static int snd_dw_hdmi_probe(struct platform_device *pdev)
113{
114 struct dw_hdmi_i2s_audio_data *audio = pdev->dev.platform_data;
115 struct platform_device_info pdevinfo;
116 struct hdmi_codec_pdata pdata;
117 struct platform_device *platform;
118
119 pdata.ops = &dw_hdmi_i2s_ops;
120 pdata.i2s = 1;
121 pdata.max_i2s_channels = 6;
122 pdata.data = audio;
123
124 memset(&pdevinfo, 0, sizeof(pdevinfo));
125 pdevinfo.parent = pdev->dev.parent;
126 pdevinfo.id = PLATFORM_DEVID_AUTO;
127 pdevinfo.name = HDMI_CODEC_DRV_NAME;
128 pdevinfo.data = &pdata;
129 pdevinfo.size_data = sizeof(pdata);
130 pdevinfo.dma_mask = DMA_BIT_MASK(32);
131
132 platform = platform_device_register_full(&pdevinfo);
133 if (IS_ERR(platform))
134 return PTR_ERR(platform);
135
136 dev_set_drvdata(&pdev->dev, platform);
137
138 return 0;
139}
140
141static int snd_dw_hdmi_remove(struct platform_device *pdev)
142{
143 struct platform_device *platform = dev_get_drvdata(&pdev->dev);
144
145 platform_device_unregister(platform);
146
147 return 0;
148}
149
150static struct platform_driver snd_dw_hdmi_driver = {
151 .probe = snd_dw_hdmi_probe,
152 .remove = snd_dw_hdmi_remove,
153 .driver = {
154 .name = DRIVER_NAME,
155 .owner = THIS_MODULE,
156 },
157};
158module_platform_driver(snd_dw_hdmi_driver);
159
160MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
161MODULE_DESCRIPTION("Synopsis Designware HDMI I2S ALSA SoC interface");
162MODULE_LICENSE("GPL v2");
163MODULE_ALIAS("platform:" DRIVER_NAME);