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 31 static int edb93xx_hw_params(struct snd_pcm_substream *substream, 32 struct snd_pcm_hw_params *params) 33 { 34 struct snd_soc_pcm_runtime *rtd = substream->private_data; 35 struct snd_soc_dai *codec_dai = rtd->codec_dai; 36 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 37 int err; 38 unsigned int mclk_rate; 39 unsigned int rate = params_rate(params); 40 41 /* 42 * According to CS4271 datasheet we use MCLK/LRCK=256 for 43 * rates below 50kHz and 128 for higher sample rates 44 */ 45 if (rate < 50000) 46 mclk_rate = rate * 64 * 4; 47 else 48 mclk_rate = rate * 64 * 2; 49 50 err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate, 51 SND_SOC_CLOCK_IN); 52 if (err) 53 return err; 54 55 return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate, 56 SND_SOC_CLOCK_OUT); 57 } 58 59 static struct snd_soc_ops edb93xx_ops = { 60 .hw_params = edb93xx_hw_params, 61 }; 62 63 static struct snd_soc_dai_link edb93xx_dai = { 64 .name = "CS4271", 65 .stream_name = "CS4271 HiFi", 66 .platform_name = "ep93xx-i2s", 67 .cpu_dai_name = "ep93xx-i2s", 68 .codec_name = "spi0.0", 69 .codec_dai_name = "cs4271-hifi", 70 .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_IF | 71 SND_SOC_DAIFMT_CBS_CFS, 72 .ops = &edb93xx_ops, 73 }; 74 75 static struct snd_soc_card snd_soc_edb93xx = { 76 .name = "EDB93XX", 77 .owner = THIS_MODULE, 78 .dai_link = &edb93xx_dai, 79 .num_links = 1, 80 }; 81 82 static int edb93xx_probe(struct platform_device *pdev) 83 { 84 struct snd_soc_card *card = &snd_soc_edb93xx; 85 int ret; 86 87 ret = ep93xx_i2s_acquire(); 88 if (ret) 89 return ret; 90 91 card->dev = &pdev->dev; 92 93 ret = snd_soc_register_card(card); 94 if (ret) { 95 dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n", 96 ret); 97 ep93xx_i2s_release(); 98 } 99 100 return ret; 101 } 102 103 static int edb93xx_remove(struct platform_device *pdev) 104 { 105 struct snd_soc_card *card = platform_get_drvdata(pdev); 106 107 snd_soc_unregister_card(card); 108 ep93xx_i2s_release(); 109 110 return 0; 111 } 112 113 static struct platform_driver edb93xx_driver = { 114 .driver = { 115 .name = "edb93xx-audio", 116 }, 117 .probe = edb93xx_probe, 118 .remove = edb93xx_remove, 119 }; 120 121 module_platform_driver(edb93xx_driver); 122 123 MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>"); 124 MODULE_DESCRIPTION("ALSA SoC EDB93xx"); 125 MODULE_LICENSE("GPL"); 126 MODULE_ALIAS("platform:edb93xx-audio"); 127