| /* |
| * 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 <linux/soc/cirrus/ep93xx.h> |
| #include <sound/core.h> |
| #include <sound/pcm.h> |
| #include <sound/soc.h> |
| #include <asm/mach-types.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 const 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_NF | |
| 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"); |