forked from Minki/linux
236 lines
5.4 KiB
C
236 lines
5.4 KiB
C
/*
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* Copyright (C) 2017 Samsung Electronics Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/clk.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/module.h>
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#include <sound/soc.h>
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#include <sound/pcm_params.h>
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#include "i2s.h"
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#include "i2s-regs.h"
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struct odroid_priv {
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struct snd_soc_card card;
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struct snd_soc_dai_link dai_link;
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struct clk *clk_i2s_bus;
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struct clk *sclk_i2s;
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};
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static int odroid_card_startup(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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snd_pcm_hw_constraint_single(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2);
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return 0;
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}
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static int odroid_card_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
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unsigned int pll_freq, rclk_freq;
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int ret;
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switch (params_rate(params)) {
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case 32000:
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case 64000:
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pll_freq = 131072006U;
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break;
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case 44100:
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case 88200:
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case 176400:
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pll_freq = 180633609U;
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break;
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case 48000:
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case 96000:
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case 192000:
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pll_freq = 196608001U;
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break;
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default:
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return -EINVAL;
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}
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ret = clk_set_rate(priv->clk_i2s_bus, pll_freq / 2 + 1);
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if (ret < 0)
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return ret;
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/*
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* We add 1 to the rclk_freq value in order to avoid too low clock
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* frequency values due to the EPLL output frequency not being exact
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* multiple of the audio sampling rate.
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*/
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rclk_freq = params_rate(params) * 256 + 1;
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ret = clk_set_rate(priv->sclk_i2s, rclk_freq);
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if (ret < 0)
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return ret;
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if (rtd->num_codecs > 1) {
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struct snd_soc_dai *codec_dai = rtd->codec_dais[1];
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ret = snd_soc_dai_set_sysclk(codec_dai, 0, rclk_freq,
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SND_SOC_CLOCK_IN);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static const struct snd_soc_ops odroid_card_ops = {
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.startup = odroid_card_startup,
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.hw_params = odroid_card_hw_params,
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};
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static void odroid_put_codec_of_nodes(struct snd_soc_dai_link *link)
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{
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struct snd_soc_dai_link_component *component = link->codecs;
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int i;
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for (i = 0; i < link->num_codecs; i++, component++) {
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if (!component->of_node)
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break;
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of_node_put(component->of_node);
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}
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}
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static int odroid_audio_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *cpu, *codec;
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struct odroid_priv *priv;
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struct snd_soc_dai_link *link;
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struct snd_soc_card *card;
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int ret;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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card = &priv->card;
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card->dev = dev;
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card->owner = THIS_MODULE;
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card->fully_routed = true;
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snd_soc_card_set_drvdata(card, priv);
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ret = snd_soc_of_parse_card_name(card, "model");
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if (ret < 0)
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return ret;
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if (of_property_read_bool(dev->of_node, "samsung,audio-widgets")) {
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ret = snd_soc_of_parse_audio_simple_widgets(card,
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"samsung,audio-widgets");
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if (ret < 0)
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return ret;
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}
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if (of_property_read_bool(dev->of_node, "samsung,audio-routing")) {
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ret = snd_soc_of_parse_audio_routing(card,
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"samsung,audio-routing");
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if (ret < 0)
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return ret;
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}
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link = &priv->dai_link;
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link->ops = &odroid_card_ops;
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link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
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SND_SOC_DAIFMT_CBS_CFS;
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card->dai_link = &priv->dai_link;
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card->num_links = 1;
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cpu = of_get_child_by_name(dev->of_node, "cpu");
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codec = of_get_child_by_name(dev->of_node, "codec");
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link->cpu_of_node = of_parse_phandle(cpu, "sound-dai", 0);
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if (!link->cpu_of_node) {
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dev_err(dev, "Failed parsing cpu/sound-dai property\n");
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return -EINVAL;
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}
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ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);
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if (ret < 0)
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goto err_put_codec_n;
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link->platform_of_node = link->cpu_of_node;
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link->name = "Primary";
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link->stream_name = link->name;
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priv->sclk_i2s = of_clk_get_by_name(link->cpu_of_node, "i2s_opclk1");
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if (IS_ERR(priv->sclk_i2s)) {
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ret = PTR_ERR(priv->sclk_i2s);
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goto err_put_i2s_n;
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}
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priv->clk_i2s_bus = of_clk_get_by_name(link->cpu_of_node, "iis");
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if (IS_ERR(priv->clk_i2s_bus)) {
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ret = PTR_ERR(priv->clk_i2s_bus);
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goto err_put_sclk;
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}
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ret = devm_snd_soc_register_card(dev, card);
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if (ret < 0) {
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dev_err(dev, "snd_soc_register_card() failed: %d\n", ret);
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goto err_put_clk_i2s;
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}
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return 0;
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err_put_clk_i2s:
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clk_put(priv->clk_i2s_bus);
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err_put_sclk:
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clk_put(priv->sclk_i2s);
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err_put_i2s_n:
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of_node_put(link->cpu_of_node);
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err_put_codec_n:
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odroid_put_codec_of_nodes(link);
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return ret;
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}
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static int odroid_audio_remove(struct platform_device *pdev)
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{
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struct odroid_priv *priv = platform_get_drvdata(pdev);
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of_node_put(priv->dai_link.cpu_of_node);
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odroid_put_codec_of_nodes(&priv->dai_link);
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clk_put(priv->sclk_i2s);
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clk_put(priv->clk_i2s_bus);
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return 0;
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}
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static const struct of_device_id odroid_audio_of_match[] = {
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{ .compatible = "samsung,odroid-xu3-audio" },
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{ .compatible = "samsung,odroid-xu4-audio"},
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{ },
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};
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MODULE_DEVICE_TABLE(of, odroid_audio_of_match);
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static struct platform_driver odroid_audio_driver = {
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.driver = {
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.name = "odroid-audio",
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.of_match_table = odroid_audio_of_match,
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.pm = &snd_soc_pm_ops,
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},
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.probe = odroid_audio_probe,
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.remove = odroid_audio_remove,
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};
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module_platform_driver(odroid_audio_driver);
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MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
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MODULE_DESCRIPTION("Odroid XU3/XU4 audio support");
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MODULE_LICENSE("GPL v2");
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