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(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(codec_dai, 0, mclk_rate, 41 SND_SOC_CLOCK_IN); 42 if (err) 43 return err; 44 45 return snd_soc_dai_set_sysclk(cpu_dai, 0, 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