cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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edb93xx.c (2898B)

      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");