1 /* 2 * SoC audio for EDB93xx 3 * 4 * Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 2 9 * of the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * This driver support CS4271 codec being master or slave, working 17 * in control port mode, connected either via SPI or I2C. 18 * The data format accepted is I2S or left-justified. 19 * DAPM support not implemented. 20 */ 21 22 #include <linux/platform_device.h> 23 #include <linux/gpio.h> 24 #include <linux/module.h> 25 #include <sound/core.h> 26 #include <sound/pcm.h> 27 #include <sound/soc.h> 28 #include <asm/mach-types.h> 29 #include <mach/hardware.h> 30 #include "ep93xx-pcm.h" 31 32 static int edb93xx_hw_params(struct snd_pcm_substream *substream, 33 struct snd_pcm_hw_params *params) 34 { 35 struct snd_soc_pcm_runtime *rtd = substream->private_data; 36 struct snd_soc_dai *codec_dai = rtd->codec_dai; 37 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 38 int err; 39 unsigned int mclk_rate; 40 unsigned int rate = params_rate(params); 41 42 /* 43 * According to CS4271 datasheet we use MCLK/LRCK=256 for 44 * rates below 50kHz and 128 for higher sample rates 45 */ 46 if (rate < 50000) 47 mclk_rate = rate * 64 * 4; 48 else 49 mclk_rate = rate * 64 * 2; 50 51 err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate, 52 SND_SOC_CLOCK_IN); 53 if (err) 54 return err; 55 56 return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate, 57 SND_SOC_CLOCK_OUT); 58 } 59 60 static struct snd_soc_ops edb93xx_ops = { 61 .hw_params = edb93xx_hw_params, 62 }; 63 64 static struct snd_soc_dai_link edb93xx_dai = { 65 .name = "CS4271", 66 .stream_name = "CS4271 HiFi", 67 .platform_name = "ep93xx-pcm-audio", 68 .cpu_dai_name = "ep93xx-i2s", 69 .codec_name = "spi0.0", 70 .codec_dai_name = "cs4271-hifi", 71 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_IF | 72 SND_SOC_DAIFMT_CBS_CFS, 73 .ops = &edb93xx_ops, 74 }; 75 76 static struct snd_soc_card snd_soc_edb93xx = { 77 .name = "EDB93XX", 78 .owner = THIS_MODULE, 79 .dai_link = &edb93xx_dai, 80 .num_links = 1, 81 }; 82 83 static int edb93xx_probe(struct platform_device *pdev) 84 { 85 struct snd_soc_card *card = &snd_soc_edb93xx; 86 int ret; 87 88 ret = ep93xx_i2s_acquire(); 89 if (ret) 90 return ret; 91 92 card->dev = &pdev->dev; 93 94 ret = snd_soc_register_card(card); 95 if (ret) { 96 dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", 97 ret); 98 ep93xx_i2s_release(); 99 } 100 101 return ret; 102 } 103 104 static int edb93xx_remove(struct platform_device *pdev) 105 { 106 struct snd_soc_card *card = platform_get_drvdata(pdev); 107 108 snd_soc_unregister_card(card); 109 ep93xx_i2s_release(); 110 111 return 0; 112 } 113 114 static struct platform_driver edb93xx_driver = { 115 .driver = { 116 .name = "edb93xx-audio", 117 .owner = THIS_MODULE, 118 }, 119 .probe = edb93xx_probe, 120 .remove = edb93xx_remove, 121 }; 122 123 module_platform_driver(edb93xx_driver); 124 125 MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>"); 126 MODULE_DESCRIPTION("ALSA SoC EDB93xx"); 127 MODULE_LICENSE("GPL"); 128 MODULE_ALIAS("platform:edb93xx-audio"); 129