summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
blob: 2228689d9a5e6ac743f4418e241f2873aabe62f2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
// SPDX-License-Identifier: GPL-2.0
/*
 * dw-hdmi-i2s-audio.c
 *
 * Copyright (c) 2017 Renesas Solutions Corp.
 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 */
#include <drm/bridge/dw_hdmi.h>

#include <sound/hdmi-codec.h>

#include "dw-hdmi.h"
#include "dw-hdmi-audio.h"

#define DRIVER_NAME "dw-hdmi-i2s-audio"

static inline void hdmi_write(struct dw_hdmi_i2s_audio_data *audio,
			      u8 val, int offset)
{
	struct dw_hdmi *hdmi = audio->hdmi;

	audio->write(hdmi, val, offset);
}

static inline u8 hdmi_read(struct dw_hdmi_i2s_audio_data *audio, int offset)
{
	struct dw_hdmi *hdmi = audio->hdmi;

	return audio->read(hdmi, offset);
}

static int dw_hdmi_i2s_hw_params(struct device *dev, void *data,
				 struct hdmi_codec_daifmt *fmt,
				 struct hdmi_codec_params *hparms)
{
	struct dw_hdmi_i2s_audio_data *audio = data;
	struct dw_hdmi *hdmi = audio->hdmi;
	u8 conf0 = 0;
	u8 conf1 = 0;
	u8 inputclkfs = 0;

	/* it cares I2S only */
	if ((fmt->fmt != HDMI_I2S) ||
	    (fmt->bit_clk_master | fmt->frame_clk_master)) {
		dev_err(dev, "unsupported format/settings\n");
		return -EINVAL;
	}

	inputclkfs	= HDMI_AUD_INPUTCLKFS_64FS;
	conf0		= HDMI_AUD_CONF0_I2S_ALL_ENABLE;

	switch (hparms->sample_width) {
	case 16:
		conf1 = HDMI_AUD_CONF1_WIDTH_16;
		break;
	case 24:
	case 32:
		conf1 = HDMI_AUD_CONF1_WIDTH_24;
		break;
	}

	dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate);

	hdmi_write(audio, inputclkfs, HDMI_AUD_INPUTCLKFS);
	hdmi_write(audio, conf0, HDMI_AUD_CONF0);
	hdmi_write(audio, conf1, HDMI_AUD_CONF1);

	dw_hdmi_audio_enable(hdmi);

	return 0;
}

static void dw_hdmi_i2s_audio_shutdown(struct device *dev, void *data)
{
	struct dw_hdmi_i2s_audio_data *audio = data;
	struct dw_hdmi *hdmi = audio->hdmi;

	dw_hdmi_audio_disable(hdmi);

	hdmi_write(audio, HDMI_AUD_CONF0_SW_RESET, HDMI_AUD_CONF0);
}

static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
				  struct device_node *endpoint)
{
	struct of_endpoint of_ep;
	int ret;

	ret = of_graph_parse_endpoint(endpoint, &of_ep);
	if (ret < 0)
		return ret;

	/*
	 * HDMI sound should be located as reg = <2>
	 * Then, it is sound port 0
	 */
	if (of_ep.port == 2)
		return 0;

	return -EINVAL;
}

static struct hdmi_codec_ops dw_hdmi_i2s_ops = {
	.hw_params	= dw_hdmi_i2s_hw_params,
	.audio_shutdown	= dw_hdmi_i2s_audio_shutdown,
	.get_dai_id	= dw_hdmi_i2s_get_dai_id,
};

static int snd_dw_hdmi_probe(struct platform_device *pdev)
{
	struct dw_hdmi_i2s_audio_data *audio = pdev->dev.platform_data;
	struct platform_device_info pdevinfo;
	struct hdmi_codec_pdata pdata;
	struct platform_device *platform;

	pdata.ops		= &dw_hdmi_i2s_ops;
	pdata.i2s		= 1;
	pdata.max_i2s_channels	= 6;
	pdata.data		= audio;

	memset(&pdevinfo, 0, sizeof(pdevinfo));
	pdevinfo.parent		= pdev->dev.parent;
	pdevinfo.id		= PLATFORM_DEVID_AUTO;
	pdevinfo.name		= HDMI_CODEC_DRV_NAME;
	pdevinfo.data		= &pdata;
	pdevinfo.size_data	= sizeof(pdata);
	pdevinfo.dma_mask	= DMA_BIT_MASK(32);

	platform = platform_device_register_full(&pdevinfo);
	if (IS_ERR(platform))
		return PTR_ERR(platform);

	dev_set_drvdata(&pdev->dev, platform);

	return 0;
}

static int snd_dw_hdmi_remove(struct platform_device *pdev)
{
	struct platform_device *platform = dev_get_drvdata(&pdev->dev);

	platform_device_unregister(platform);

	return 0;
}

static struct platform_driver snd_dw_hdmi_driver = {
	.probe	= snd_dw_hdmi_probe,
	.remove	= snd_dw_hdmi_remove,
	.driver	= {
		.name = DRIVER_NAME,
	},
};
module_platform_driver(snd_dw_hdmi_driver);

MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
MODULE_DESCRIPTION("Synopsis Designware HDMI I2S ALSA SoC interface");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRIVER_NAME);