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 
edb93xx_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)22 static 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 
50 static const struct snd_soc_ops edb93xx_ops = {
51 	.hw_params	= edb93xx_hw_params,
52 };
53 
54 SND_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 
59 static 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_CBC_CFC,
64 	.ops		= &edb93xx_ops,
65 	SND_SOC_DAILINK_REG(hifi),
66 };
67 
68 static 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 
edb93xx_probe(struct platform_device * pdev)75 static 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 
edb93xx_remove(struct platform_device * pdev)96 static 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 
106 static struct platform_driver edb93xx_driver = {
107 	.driver		= {
108 		.name	= "edb93xx-audio",
109 	},
110 	.probe		= edb93xx_probe,
111 	.remove		= edb93xx_remove,
112 };
113 
114 module_platform_driver(edb93xx_driver);
115 
116 MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
117 MODULE_DESCRIPTION("ALSA SoC EDB93xx");
118 MODULE_LICENSE("GPL");
119 MODULE_ALIAS("platform:edb93xx-audio");
120