soc/cirrus/edb93xx.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * SoC audio for EDB93xx
0004  *
0005  * Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru>
0006  *
0007  * This driver support CS4271 codec being master or slave, working
0008  * in control port mode, connected either via SPI or I2C.
0009  * The data format accepted is I2S or left-justified.
0010  * DAPM support not implemented.
0011  */
0012
0013 #include <linux/platform_device.h>
0014 #include <linux/gpio.h>
0015 #include <linux/module.h>
0016 #include <linux/soc/cirrus/ep93xx.h>
0017 #include <sound/core.h>
0018 #include <sound/pcm.h>
0019 #include <sound/soc.h>
0020 #include <asm/mach-types.h>
0021
0022 static int edb93xx_hw_params(struct snd_pcm_substream *substream,
0023                  struct snd_pcm_hw_params *params)
0024 {
0025     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
0026     struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
0027     struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
0028     int err;
0029     unsigned int mclk_rate;
0030     unsigned int rate = params_rate(params);
0031
0032     /*
0033      * According to CS4271 datasheet we use MCLK/LRCK=256 for
0034      * rates below 50kHz and 128 for higher sample rates
0035      */
0036     if (rate < 50000)
0037         mclk_rate = rate * 64 * 4;
0038     else
0039         mclk_rate = rate * 64 * 2;
0040
0041     err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate,
0042                      SND_SOC_CLOCK_IN);
0043     if (err)
0044         return err;
0045
0046     return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate,
0047                       SND_SOC_CLOCK_OUT);
0048 }
0049
0050 static const struct snd_soc_ops edb93xx_ops = {
0051     .hw_params  = edb93xx_hw_params,
0052 };
0053
0054 SND_SOC_DAILINK_DEFS(hifi,
0055     DAILINK_COMP_ARRAY(COMP_CPU("ep93xx-i2s")),
0056     DAILINK_COMP_ARRAY(COMP_CODEC("spi0.0", "cs4271-hifi")),
0057     DAILINK_COMP_ARRAY(COMP_PLATFORM("ep93xx-i2s")));
0058
0059 static struct snd_soc_dai_link edb93xx_dai = {
0060     .name       = "CS4271",
0061     .stream_name    = "CS4271 HiFi",
0062     .dai_fmt    = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
0063               SND_SOC_DAIFMT_CBC_CFC,
0064     .ops        = &edb93xx_ops,
0065     SND_SOC_DAILINK_REG(hifi),
0066 };
0067
0068 static struct snd_soc_card snd_soc_edb93xx = {
0069     .name       = "EDB93XX",
0070     .owner      = THIS_MODULE,
0071     .dai_link   = &edb93xx_dai,
0072     .num_links  = 1,
0073 };
0074
0075 static int edb93xx_probe(struct platform_device *pdev)
0076 {
0077     struct snd_soc_card *card = &snd_soc_edb93xx;
0078     int ret;
0079
0080     ret = ep93xx_i2s_acquire();
0081     if (ret)
0082         return ret;
0083
0084     card->dev = &pdev->dev;
0085
0086     ret = snd_soc_register_card(card);
0087     if (ret) {
0088         dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
0089             ret);
0090         ep93xx_i2s_release();
0091     }
0092
0093     return ret;
0094 }
0095
0096 static int edb93xx_remove(struct platform_device *pdev)
0097 {
0098     struct snd_soc_card *card = platform_get_drvdata(pdev);
0099
0100     snd_soc_unregister_card(card);
0101     ep93xx_i2s_release();
0102
0103     return 0;
0104 }
0105
0106 static struct platform_driver edb93xx_driver = {
0107     .driver     = {
0108         .name   = "edb93xx-audio",
0109     },
0110     .probe      = edb93xx_probe,
0111     .remove     = edb93xx_remove,
0112 };
0113
0114 module_platform_driver(edb93xx_driver);
0115
0116 MODULE_AUTHOR("Alexander Sverdlin <subaparts@yandex.ru>");
0117 MODULE_DESCRIPTION("ALSA SoC EDB93xx");
0118 MODULE_LICENSE("GPL");
0119 MODULE_ALIAS("platform:edb93xx-audio");