tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * dw-hdmi-i2s-audio.c
4 *
5 * Copyright (c) 2017 Renesas Solutions Corp.
6 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
7 */
8
9#include <linux/dma-mapping.h>
10#include <linux/module.h>
11
12#include <drm/bridge/dw_hdmi.h>
13
14#include <sound/hdmi-codec.h>
15
16#include "dw-hdmi.h"
17#include "dw-hdmi-audio.h"
18
19#define DRIVER_NAME "dw-hdmi-i2s-audio"
20
21static inline void hdmi_write(struct dw_hdmi_i2s_audio_data *audio,
22 u8 val, int offset)
23{
24 struct dw_hdmi *hdmi = audio->hdmi;
25
26 audio->write(hdmi, val, offset);
27}
28
29static inline u8 hdmi_read(struct dw_hdmi_i2s_audio_data *audio, int offset)
30{
31 struct dw_hdmi *hdmi = audio->hdmi;
32
33 return audio->read(hdmi, offset);
34}
35
36static int dw_hdmi_i2s_hw_params(struct device *dev, void *data,
37 struct hdmi_codec_daifmt *fmt,
38 struct hdmi_codec_params *hparms)
39{
40 struct dw_hdmi_i2s_audio_data *audio = data;
41 struct dw_hdmi *hdmi = audio->hdmi;
42 u8 conf0 = 0;
43 u8 conf1 = 0;
44 u8 inputclkfs = 0;
45
46 /* it cares I2S only */
47 if ((fmt->fmt != HDMI_I2S) ||
48 (fmt->bit_clk_master | fmt->frame_clk_master)) {
49 dev_err(dev, "unsupported format/settings\n");
50 return -EINVAL;
51 }
52
53 inputclkfs = HDMI_AUD_INPUTCLKFS_64FS;
54 conf0 = HDMI_AUD_CONF0_I2S_ALL_ENABLE;
55
56 switch (hparms->sample_width) {
57 case 16:
58 conf1 = HDMI_AUD_CONF1_WIDTH_16;
59 break;
60 case 24:
61 case 32:
62 conf1 = HDMI_AUD_CONF1_WIDTH_24;
63 break;
64 }
65
66 dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate);
67
68 hdmi_write(audio, inputclkfs, HDMI_AUD_INPUTCLKFS);
69 hdmi_write(audio, conf0, HDMI_AUD_CONF0);
70 hdmi_write(audio, conf1, HDMI_AUD_CONF1);
71
72 dw_hdmi_audio_enable(hdmi);
73
74 return 0;
75}
76
77static void dw_hdmi_i2s_audio_shutdown(struct device *dev, void *data)
78{
79 struct dw_hdmi_i2s_audio_data *audio = data;
80 struct dw_hdmi *hdmi = audio->hdmi;
81
82 dw_hdmi_audio_disable(hdmi);
83
84 hdmi_write(audio, HDMI_AUD_CONF0_SW_RESET, HDMI_AUD_CONF0);
85}
86
87static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
88 struct device_node *endpoint)
89{
90 struct of_endpoint of_ep;
91 int ret;
92
93 ret = of_graph_parse_endpoint(endpoint, &of_ep);
94 if (ret < 0)
95 return ret;
96
97 /*
98 * HDMI sound should be located as reg = <2>
99 * Then, it is sound port 0
100 */
101 if (of_ep.port == 2)
102 return 0;
103
104 return -EINVAL;
105}
106
107static struct hdmi_codec_ops dw_hdmi_i2s_ops = {
108 .hw_params = dw_hdmi_i2s_hw_params,
109 .audio_shutdown = dw_hdmi_i2s_audio_shutdown,
110 .get_dai_id = dw_hdmi_i2s_get_dai_id,
111};
112
113static int snd_dw_hdmi_probe(struct platform_device *pdev)
114{
115 struct dw_hdmi_i2s_audio_data *audio = pdev->dev.platform_data;
116 struct platform_device_info pdevinfo;
117 struct hdmi_codec_pdata pdata;
118 struct platform_device *platform;
119
120 pdata.ops = &dw_hdmi_i2s_ops;
121 pdata.i2s = 1;
122 pdata.max_i2s_channels = 6;
123 pdata.data = audio;
124
125 memset(&pdevinfo, 0, sizeof(pdevinfo));
126 pdevinfo.parent = pdev->dev.parent;
127 pdevinfo.id = PLATFORM_DEVID_AUTO;
128 pdevinfo.name = HDMI_CODEC_DRV_NAME;
129 pdevinfo.data = &pdata;
130 pdevinfo.size_data = sizeof(pdata);
131 pdevinfo.dma_mask = DMA_BIT_MASK(32);
132
133 platform = platform_device_register_full(&pdevinfo);
134 if (IS_ERR(platform))
135 return PTR_ERR(platform);
136
137 dev_set_drvdata(&pdev->dev, platform);
138
139 return 0;
140}
141
142static int snd_dw_hdmi_remove(struct platform_device *pdev)
143{
144 struct platform_device *platform = dev_get_drvdata(&pdev->dev);
145
146 platform_device_unregister(platform);
147
148 return 0;
149}
150
151static struct platform_driver snd_dw_hdmi_driver = {
152 .probe = snd_dw_hdmi_probe,
153 .remove = snd_dw_hdmi_remove,
154 .driver = {
155 .name = DRIVER_NAME,
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);