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(p: 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(dai: codec_dai, clk_id: 0, freq: mclk_rate,
41 SND_SOC_CLOCK_IN);
42 if (err)
43 return err;
44
45 return snd_soc_dai_set_sysclk(dai: cpu_dai, clk_id: 0, freq: 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

source code of linux/sound/soc/cirrus/edb93xx.c