1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * SoC audio for EDB93xx
5 * Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru>
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.
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>
21 static int edb93xx_hw_params(struct snd_pcm_substream *substream,
22 struct snd_pcm_hw_params *params)
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);
28 unsigned int mclk_rate;
29 unsigned int rate = params_rate(params);
32 * According to CS4271 datasheet we use MCLK/LRCK=256 for
33 * rates below 50kHz and 128 for higher sample rates
36 mclk_rate = rate * 64 * 4;
38 mclk_rate = rate * 64 * 2;
40 err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate,
45 return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate,
49 static const struct snd_soc_ops edb93xx_ops = {
50 .hw_params = edb93xx_hw_params,
53 SND_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")));
58 static struct snd_soc_dai_link edb93xx_dai = {
60 .stream_name = "CS4271 HiFi",
61 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
62 SND_SOC_DAIFMT_CBC_CFC,
64 SND_SOC_DAILINK_REG(hifi),
67 static struct snd_soc_card snd_soc_edb93xx = {
70 .dai_link = &edb93xx_dai,
74 static int edb93xx_probe(struct platform_device *pdev)
76 struct snd_soc_card *card = &snd_soc_edb93xx;
79 ret = ep93xx_i2s_acquire();
83 card->dev = &pdev->dev;
85 ret = snd_soc_register_card(card);
87 dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
95 static void edb93xx_remove(struct platform_device *pdev)
97 struct snd_soc_card *card = platform_get_drvdata(pdev);
99 snd_soc_unregister_card(card);
100 ep93xx_i2s_release();
103 static struct platform_driver edb93xx_driver = {
105 .name = "edb93xx-audio",
107 .probe = edb93xx_probe,
108 .remove_new = edb93xx_remove,
111 module_platform_driver(edb93xx_driver);
113 MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
114 MODULE_DESCRIPTION("ALSA SoC EDB93xx");
115 MODULE_LICENSE("GPL");
116 MODULE_ALIAS("platform:edb93xx-audio");