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