1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * SoC audio for EDB93xx
4 *
5 * Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru>
6 *
7 * This driver support CS4271 codec being master or slave, working
8 * in control port mode, connected either via SPI or I2C.
9 * The data format accepted is I2S or left-justified.
10 * DAPM support not implemented.
11 */
12
13#include <linux/platform_device.h>
14#include <linux/gpio.h>
15#include <linux/module.h>
16#include <linux/soc/cirrus/ep93xx.h>
17#include <sound/core.h>
18#include <sound/pcm.h>
19#include <sound/soc.h>
20#include <asm/mach-types.h>
21
22static int edb93xx_hw_params(struct snd_pcm_substream *substream,
23			     struct snd_pcm_hw_params *params)
24{
25	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
26	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
27	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
28	int err;
29	unsigned int mclk_rate;
30	unsigned int rate = params_rate(params);
31
32	/*
33	 * According to CS4271 datasheet we use MCLK/LRCK=256 for
34	 * rates below 50kHz and 128 for higher sample rates
35	 */
36	if (rate < 50000)
37		mclk_rate = rate * 64 * 4;
38	else
39		mclk_rate = rate * 64 * 2;
40
41	err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate,
42				     SND_SOC_CLOCK_IN);
43	if (err)
44		return err;
45
46	return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate,
47				      SND_SOC_CLOCK_OUT);
48}
49
50static const struct snd_soc_ops edb93xx_ops = {
51	.hw_params	= edb93xx_hw_params,
52};
53
54SND_SOC_DAILINK_DEFS(hifi,
55	DAILINK_COMP_ARRAY(COMP_CPU("ep93xx-i2s")),
56	DAILINK_COMP_ARRAY(COMP_CODEC("spi0.0", "cs4271-hifi")),
57	DAILINK_COMP_ARRAY(COMP_PLATFORM("ep93xx-i2s")));
58
59static struct snd_soc_dai_link edb93xx_dai = {
60	.name		= "CS4271",
61	.stream_name	= "CS4271 HiFi",
62	.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
63			  SND_SOC_DAIFMT_CBS_CFS,
64	.ops		= &edb93xx_ops,
65	SND_SOC_DAILINK_REG(hifi),
66};
67
68static struct snd_soc_card snd_soc_edb93xx = {
69	.name		= "EDB93XX",
70	.owner		= THIS_MODULE,
71	.dai_link	= &edb93xx_dai,
72	.num_links	= 1,
73};
74
75static int edb93xx_probe(struct platform_device *pdev)
76{
77	struct snd_soc_card *card = &snd_soc_edb93xx;
78	int ret;
79
80	ret = ep93xx_i2s_acquire();
81	if (ret)
82		return ret;
83
84	card->dev = &pdev->dev;
85
86	ret = snd_soc_register_card(card);
87	if (ret) {
88		dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
89			ret);
90		ep93xx_i2s_release();
91	}
92
93	return ret;
94}
95
96static int edb93xx_remove(struct platform_device *pdev)
97{
98	struct snd_soc_card *card = platform_get_drvdata(pdev);
99
100	snd_soc_unregister_card(card);
101	ep93xx_i2s_release();
102
103	return 0;
104}
105
106static struct platform_driver edb93xx_driver = {
107	.driver		= {
108		.name	= "edb93xx-audio",
109	},
110	.probe		= edb93xx_probe,
111	.remove		= edb93xx_remove,
112};
113
114module_platform_driver(edb93xx_driver);
115
116MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
117MODULE_DESCRIPTION("ALSA SoC EDB93xx");
118MODULE_LICENSE("GPL");
119MODULE_ALIAS("platform:edb93xx-audio");
120