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 22 static 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 50 static const struct snd_soc_ops edb93xx_ops = { 51 .hw_params = edb93xx_hw_params, 52 }; 53 54 SND_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 59 static 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 68 static 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 75 static 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 96 static void 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 } 103 104 static struct platform_driver edb93xx_driver = { 105 .driver = { 106 .name = "edb93xx-audio", 107 }, 108 .probe = edb93xx_probe, 109 .remove_new = edb93xx_remove, 110 }; 111 112 module_platform_driver(edb93xx_driver); 113 114 MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>"); 115 MODULE_DESCRIPTION("ALSA SoC EDB93xx"); 116 MODULE_LICENSE("GPL"); 117 MODULE_ALIAS("platform:edb93xx-audio"); 118