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