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/module.h>
15#include <linux/soc/cirrus/ep93xx.h>
16#include <sound/core.h>
17#include <sound/pcm.h>
18#include <sound/soc.h>
19#include <asm/mach-types.h>
20
21static int edb93xx_hw_params(struct snd_pcm_substream *substream,
22			     struct snd_pcm_hw_params *params)
23{
24	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
25	struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
26	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
27	int err;
28	unsigned int mclk_rate;
29	unsigned int rate = params_rate(params);
30
31	/*
32	 * According to CS4271 datasheet we use MCLK/LRCK=256 for
33	 * rates below 50kHz and 128 for higher sample rates
34	 */
35	if (rate < 50000)
36		mclk_rate = rate * 64 * 4;
37	else
38		mclk_rate = rate * 64 * 2;
39
40	err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate,
41				     SND_SOC_CLOCK_IN);
42	if (err)
43		return err;
44
45	return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate,
46				      SND_SOC_CLOCK_OUT);
47}
48
49static const struct snd_soc_ops edb93xx_ops = {
50	.hw_params	= edb93xx_hw_params,
51};
52
53SND_SOC_DAILINK_DEFS(hifi,
54	DAILINK_COMP_ARRAY(COMP_CPU("ep93xx-i2s")),
55	DAILINK_COMP_ARRAY(COMP_CODEC("spi0.0", "cs4271-hifi")),
56	DAILINK_COMP_ARRAY(COMP_PLATFORM("ep93xx-i2s")));
57
58static struct snd_soc_dai_link edb93xx_dai = {
59	.name		= "CS4271",
60	.stream_name	= "CS4271 HiFi",
61	.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
62			  SND_SOC_DAIFMT_CBC_CFC,
63	.ops		= &edb93xx_ops,
64	SND_SOC_DAILINK_REG(hifi),
65};
66
67static struct snd_soc_card snd_soc_edb93xx = {
68	.name		= "EDB93XX",
69	.owner		= THIS_MODULE,
70	.dai_link	= &edb93xx_dai,
71	.num_links	= 1,
72};
73
74static int edb93xx_probe(struct platform_device *pdev)
75{
76	struct snd_soc_card *card = &snd_soc_edb93xx;
77	int ret;
78
79	ret = ep93xx_i2s_acquire();
80	if (ret)
81		return ret;
82
83	card->dev = &pdev->dev;
84
85	ret = snd_soc_register_card(card);
86	if (ret) {
87		dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
88			ret);
89		ep93xx_i2s_release();
90	}
91
92	return ret;
93}
94
95static void edb93xx_remove(struct platform_device *pdev)
96{
97	struct snd_soc_card *card = platform_get_drvdata(pdev);
98
99	snd_soc_unregister_card(card);
100	ep93xx_i2s_release();
101}
102
103static struct platform_driver edb93xx_driver = {
104	.driver		= {
105		.name	= "edb93xx-audio",
106	},
107	.probe		= edb93xx_probe,
108	.remove_new	= edb93xx_remove,
109};
110
111module_platform_driver(edb93xx_driver);
112
113MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
114MODULE_DESCRIPTION("ALSA SoC EDB93xx");
115MODULE_LICENSE("GPL");
116MODULE_ALIAS("platform:edb93xx-audio");
117