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