2 * Copyright (C) 2017 Samsung Electronics Co., Ltd.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
11 #include <linux/of_device.h>
12 #include <linux/module.h>
13 #include <sound/soc.h>
14 #include <sound/pcm_params.h>
19 struct snd_soc_card card;
20 struct snd_soc_dai_link dai_link;
22 struct clk *clk_i2s_bus;
26 static int odroid_card_startup(struct snd_pcm_substream *substream)
28 struct snd_pcm_runtime *runtime = substream->runtime;
30 snd_pcm_hw_constraint_single(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2);
34 static int odroid_card_hw_params(struct snd_pcm_substream *substream,
35 struct snd_pcm_hw_params *params)
37 struct snd_soc_pcm_runtime *rtd = substream->private_data;
38 struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
39 unsigned int pll_freq, rclk_freq, rfs;
42 switch (params_rate(params)) {
44 pll_freq = 196608001U;
49 pll_freq = 180633609U;
55 pll_freq = 196608001U;
62 ret = clk_set_rate(priv->clk_i2s_bus, pll_freq / 2 + 1);
67 * We add 1 to the rclk_freq value in order to avoid too low clock
68 * frequency values due to the EPLL output frequency not being exact
69 * multiple of the audio sampling rate.
71 rclk_freq = params_rate(params) * rfs + 1;
73 ret = clk_set_rate(priv->sclk_i2s, rclk_freq);
77 if (rtd->num_codecs > 1) {
78 struct snd_soc_dai *codec_dai = rtd->codec_dais[1];
80 ret = snd_soc_dai_set_sysclk(codec_dai, 0, rclk_freq,
89 static const struct snd_soc_ops odroid_card_ops = {
90 .startup = odroid_card_startup,
91 .hw_params = odroid_card_hw_params,
94 static int odroid_audio_probe(struct platform_device *pdev)
96 struct device *dev = &pdev->dev;
97 struct device_node *cpu, *codec;
98 struct odroid_priv *priv;
99 struct snd_soc_dai_link *link;
100 struct snd_soc_card *card;
103 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
110 card->owner = THIS_MODULE;
111 card->fully_routed = true;
113 snd_soc_card_set_drvdata(card, priv);
115 ret = snd_soc_of_parse_card_name(card, "model");
119 if (of_property_read_bool(dev->of_node, "samsung,audio-widgets")) {
120 ret = snd_soc_of_parse_audio_simple_widgets(card,
121 "samsung,audio-widgets");
126 if (of_property_read_bool(dev->of_node, "samsung,audio-routing")) {
127 ret = snd_soc_of_parse_audio_routing(card,
128 "samsung,audio-routing");
133 link = &priv->dai_link;
135 link->ops = &odroid_card_ops;
136 link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
137 SND_SOC_DAIFMT_CBS_CFS;
139 card->dai_link = &priv->dai_link;
142 cpu = of_get_child_by_name(dev->of_node, "cpu");
143 codec = of_get_child_by_name(dev->of_node, "codec");
145 link->cpu_of_node = of_parse_phandle(cpu, "sound-dai", 0);
146 if (!link->cpu_of_node) {
147 dev_err(dev, "Failed parsing cpu/sound-dai property\n");
151 ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);
153 goto err_put_codec_n;
155 link->platform_of_node = link->cpu_of_node;
157 link->name = "Primary";
158 link->stream_name = link->name;
161 priv->sclk_i2s = of_clk_get_by_name(link->cpu_of_node, "i2s_opclk1");
162 if (IS_ERR(priv->sclk_i2s)) {
163 ret = PTR_ERR(priv->sclk_i2s);
167 priv->clk_i2s_bus = of_clk_get_by_name(link->cpu_of_node, "iis");
168 if (IS_ERR(priv->clk_i2s_bus)) {
169 ret = PTR_ERR(priv->clk_i2s_bus);
173 ret = devm_snd_soc_register_card(dev, card);
175 dev_err(dev, "snd_soc_register_card() failed: %d\n", ret);
176 goto err_put_clk_i2s;
182 clk_put(priv->clk_i2s_bus);
184 clk_put(priv->sclk_i2s);
186 of_node_put(link->cpu_of_node);
188 snd_soc_of_put_dai_link_codecs(link);
192 static int odroid_audio_remove(struct platform_device *pdev)
194 struct odroid_priv *priv = platform_get_drvdata(pdev);
196 of_node_put(priv->dai_link.cpu_of_node);
197 snd_soc_of_put_dai_link_codecs(&priv->dai_link);
198 clk_put(priv->sclk_i2s);
199 clk_put(priv->clk_i2s_bus);
204 static const struct of_device_id odroid_audio_of_match[] = {
205 { .compatible = "hardkernel,odroid-xu3-audio" },
206 { .compatible = "hardkernel,odroid-xu4-audio" },
207 { .compatible = "samsung,odroid-xu3-audio" },
208 { .compatible = "samsung,odroid-xu4-audio" },
211 MODULE_DEVICE_TABLE(of, odroid_audio_of_match);
213 static struct platform_driver odroid_audio_driver = {
215 .name = "odroid-audio",
216 .of_match_table = odroid_audio_of_match,
217 .pm = &snd_soc_pm_ops,
219 .probe = odroid_audio_probe,
220 .remove = odroid_audio_remove,
222 module_platform_driver(odroid_audio_driver);
224 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
225 MODULE_DESCRIPTION("Odroid XU3/XU4 audio support");
226 MODULE_LICENSE("GPL v2");