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Linux/sound/soc/samsung/odroid.c

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  1 /*
  2  * Copyright (C) 2017 Samsung Electronics Co., Ltd.
  3  *
  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.
  7  */
  8 
  9 #include <linux/clk.h>
 10 #include <linux/of.h>
 11 #include <linux/of_device.h>
 12 #include <linux/module.h>
 13 #include <sound/soc.h>
 14 #include <sound/pcm_params.h>
 15 #include "i2s.h"
 16 #include "i2s-regs.h"
 17 
 18 struct odroid_priv {
 19         struct snd_soc_card card;
 20         struct snd_soc_dai_link dai_link;
 21 
 22         struct clk *clk_i2s_bus;
 23         struct clk *sclk_i2s;
 24 };
 25 
 26 static int odroid_card_startup(struct snd_pcm_substream *substream)
 27 {
 28         struct snd_pcm_runtime *runtime = substream->runtime;
 29 
 30         snd_pcm_hw_constraint_single(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2);
 31         return 0;
 32 }
 33 
 34 static int odroid_card_hw_params(struct snd_pcm_substream *substream,
 35                                       struct snd_pcm_hw_params *params)
 36 {
 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;
 40         int ret;
 41 
 42         switch (params_rate(params)) {
 43         case 64000:
 44                 pll_freq = 196608001U;
 45                 rfs = 384;
 46                 break;
 47         case 44100:
 48         case 88200:
 49                 pll_freq = 180633609U;
 50                 rfs = 512;
 51                 break;
 52         case 32000:
 53         case 48000:
 54         case 96000:
 55                 pll_freq = 196608001U;
 56                 rfs = 512;
 57                 break;
 58         default:
 59                 return -EINVAL;
 60         }
 61 
 62         ret = clk_set_rate(priv->clk_i2s_bus, pll_freq / 2 + 1);
 63         if (ret < 0)
 64                 return ret;
 65 
 66         /*
 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.
 70          */
 71         rclk_freq = params_rate(params) * rfs + 1;
 72 
 73         ret = clk_set_rate(priv->sclk_i2s, rclk_freq);
 74         if (ret < 0)
 75                 return ret;
 76 
 77         if (rtd->num_codecs > 1) {
 78                 struct snd_soc_dai *codec_dai = rtd->codec_dais[1];
 79 
 80                 ret = snd_soc_dai_set_sysclk(codec_dai, 0, rclk_freq,
 81                                              SND_SOC_CLOCK_IN);
 82                 if (ret < 0)
 83                         return ret;
 84         }
 85 
 86         return 0;
 87 }
 88 
 89 static const struct snd_soc_ops odroid_card_ops = {
 90         .startup = odroid_card_startup,
 91         .hw_params = odroid_card_hw_params,
 92 };
 93 
 94 static int odroid_audio_probe(struct platform_device *pdev)
 95 {
 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;
101         int ret;
102 
103         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
104         if (!priv)
105                 return -ENOMEM;
106 
107         card = &priv->card;
108         card->dev = dev;
109 
110         card->owner = THIS_MODULE;
111         card->fully_routed = true;
112 
113         snd_soc_card_set_drvdata(card, priv);
114 
115         ret = snd_soc_of_parse_card_name(card, "model");
116         if (ret < 0)
117                 return ret;
118 
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");
122                 if (ret < 0)
123                         return ret;
124         }
125 
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");
129                 if (ret < 0)
130                         return ret;
131         }
132 
133         link = &priv->dai_link;
134 
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;
138 
139         card->dai_link = &priv->dai_link;
140         card->num_links = 1;
141 
142         cpu = of_get_child_by_name(dev->of_node, "cpu");
143         codec = of_get_child_by_name(dev->of_node, "codec");
144 
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");
148                 return -EINVAL;
149         }
150 
151         ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);
152         if (ret < 0)
153                 goto err_put_codec_n;
154 
155         link->platform_of_node = link->cpu_of_node;
156 
157         link->name = "Primary";
158         link->stream_name = link->name;
159 
160 
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);
164                 goto err_put_i2s_n;
165         }
166 
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);
170                 goto err_put_sclk;
171         }
172 
173         ret = devm_snd_soc_register_card(dev, card);
174         if (ret < 0) {
175                 dev_err(dev, "snd_soc_register_card() failed: %d\n", ret);
176                 goto err_put_clk_i2s;
177         }
178 
179         return 0;
180 
181 err_put_clk_i2s:
182         clk_put(priv->clk_i2s_bus);
183 err_put_sclk:
184         clk_put(priv->sclk_i2s);
185 err_put_i2s_n:
186         of_node_put(link->cpu_of_node);
187 err_put_codec_n:
188         snd_soc_of_put_dai_link_codecs(link);
189         return ret;
190 }
191 
192 static int odroid_audio_remove(struct platform_device *pdev)
193 {
194         struct odroid_priv *priv = platform_get_drvdata(pdev);
195 
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);
200 
201         return 0;
202 }
203 
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" },
209         { },
210 };
211 MODULE_DEVICE_TABLE(of, odroid_audio_of_match);
212 
213 static struct platform_driver odroid_audio_driver = {
214         .driver = {
215                 .name           = "odroid-audio",
216                 .of_match_table = odroid_audio_of_match,
217                 .pm             = &snd_soc_pm_ops,
218         },
219         .probe  = odroid_audio_probe,
220         .remove = odroid_audio_remove,
221 };
222 module_platform_driver(odroid_audio_driver);
223 
224 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
225 MODULE_DESCRIPTION("Odroid XU3/XU4 audio support");
226 MODULE_LICENSE("GPL v2");
227 

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