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; 40 int ret; 41 42 switch (params_rate(params)) { 43 case 32000: 44 case 64000: 45 pll_freq = 131072006U; 46 break; 47 case 44100: 48 case 88200: 49 case 176400: 50 pll_freq = 180633609U; 51 break; 52 case 48000: 53 case 96000: 54 case 192000: 55 pll_freq = 196608001U; 56 break; 57 default: 58 return -EINVAL; 59 } 60 61 ret = clk_set_rate(priv->clk_i2s_bus, pll_freq / 2 + 1); 62 if (ret < 0) 63 return ret; 64 65 /* 66 * We add 1 to the rclk_freq value in order to avoid too low clock 67 * frequency values due to the EPLL output frequency not being exact 68 * multiple of the audio sampling rate. 69 */ 70 rclk_freq = params_rate(params) * 256 + 1; 71 72 ret = clk_set_rate(priv->sclk_i2s, rclk_freq); 73 if (ret < 0) 74 return ret; 75 76 if (rtd->num_codecs > 1) { 77 struct snd_soc_dai *codec_dai = rtd->codec_dais[1]; 78 79 ret = snd_soc_dai_set_sysclk(codec_dai, 0, rclk_freq, 80 SND_SOC_CLOCK_IN); 81 if (ret < 0) 82 return ret; 83 } 84 85 return 0; 86 } 87 88 static const struct snd_soc_ops odroid_card_ops = { 89 .startup = odroid_card_startup, 90 .hw_params = odroid_card_hw_params, 91 }; 92 93 static void odroid_put_codec_of_nodes(struct snd_soc_dai_link *link) 94 { 95 struct snd_soc_dai_link_component *component = link->codecs; 96 int i; 97 98 for (i = 0; i < link->num_codecs; i++, component++) { 99 if (!component->of_node) 100 break; 101 of_node_put(component->of_node); 102 } 103 } 104 105 static int odroid_audio_probe(struct platform_device *pdev) 106 { 107 struct device *dev = &pdev->dev; 108 struct device_node *cpu, *codec; 109 struct odroid_priv *priv; 110 struct snd_soc_dai_link *link; 111 struct snd_soc_card *card; 112 int ret; 113 114 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 115 if (!priv) 116 return -ENOMEM; 117 118 card = &priv->card; 119 card->dev = dev; 120 121 card->owner = THIS_MODULE; 122 card->fully_routed = true; 123 124 snd_soc_card_set_drvdata(card, priv); 125 126 ret = snd_soc_of_parse_card_name(card, "model"); 127 if (ret < 0) 128 return ret; 129 130 if (of_property_read_bool(dev->of_node, "samsung,audio-widgets")) { 131 ret = snd_soc_of_parse_audio_simple_widgets(card, 132 "samsung,audio-widgets"); 133 if (ret < 0) 134 return ret; 135 } 136 137 if (of_property_read_bool(dev->of_node, "samsung,audio-routing")) { 138 ret = snd_soc_of_parse_audio_routing(card, 139 "samsung,audio-routing"); 140 if (ret < 0) 141 return ret; 142 } 143 144 link = &priv->dai_link; 145 146 link->ops = &odroid_card_ops; 147 link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | 148 SND_SOC_DAIFMT_CBS_CFS; 149 150 card->dai_link = &priv->dai_link; 151 card->num_links = 1; 152 153 cpu = of_get_child_by_name(dev->of_node, "cpu"); 154 codec = of_get_child_by_name(dev->of_node, "codec"); 155 156 link->cpu_of_node = of_parse_phandle(cpu, "sound-dai", 0); 157 if (!link->cpu_of_node) { 158 dev_err(dev, "Failed parsing cpu/sound-dai property\n"); 159 return -EINVAL; 160 } 161 162 ret = snd_soc_of_get_dai_link_codecs(dev, codec, link); 163 if (ret < 0) 164 goto err_put_codec_n; 165 166 link->platform_of_node = link->cpu_of_node; 167 168 link->name = "Primary"; 169 link->stream_name = link->name; 170 171 172 priv->sclk_i2s = of_clk_get_by_name(link->cpu_of_node, "i2s_opclk1"); 173 if (IS_ERR(priv->sclk_i2s)) { 174 ret = PTR_ERR(priv->sclk_i2s); 175 goto err_put_i2s_n; 176 } 177 178 priv->clk_i2s_bus = of_clk_get_by_name(link->cpu_of_node, "iis"); 179 if (IS_ERR(priv->clk_i2s_bus)) { 180 ret = PTR_ERR(priv->clk_i2s_bus); 181 goto err_put_sclk; 182 } 183 184 ret = devm_snd_soc_register_card(dev, card); 185 if (ret < 0) { 186 dev_err(dev, "snd_soc_register_card() failed: %d\n", ret); 187 goto err_put_clk_i2s; 188 } 189 190 return 0; 191 192 err_put_clk_i2s: 193 clk_put(priv->clk_i2s_bus); 194 err_put_sclk: 195 clk_put(priv->sclk_i2s); 196 err_put_i2s_n: 197 of_node_put(link->cpu_of_node); 198 err_put_codec_n: 199 odroid_put_codec_of_nodes(link); 200 return ret; 201 } 202 203 static int odroid_audio_remove(struct platform_device *pdev) 204 { 205 struct odroid_priv *priv = platform_get_drvdata(pdev); 206 207 of_node_put(priv->dai_link.cpu_of_node); 208 odroid_put_codec_of_nodes(&priv->dai_link); 209 clk_put(priv->sclk_i2s); 210 clk_put(priv->clk_i2s_bus); 211 212 return 0; 213 } 214 215 static const struct of_device_id odroid_audio_of_match[] = { 216 { .compatible = "samsung,odroid-xu3-audio" }, 217 { .compatible = "samsung,odroid-xu4-audio"}, 218 { }, 219 }; 220 MODULE_DEVICE_TABLE(of, odroid_audio_of_match); 221 222 static struct platform_driver odroid_audio_driver = { 223 .driver = { 224 .name = "odroid-audio", 225 .of_match_table = odroid_audio_of_match, 226 .pm = &snd_soc_pm_ops, 227 }, 228 .probe = odroid_audio_probe, 229 .remove = odroid_audio_remove, 230 }; 231 module_platform_driver(odroid_audio_driver); 232 233 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>"); 234 MODULE_DESCRIPTION("Odroid XU3/XU4 audio support"); 235 MODULE_LICENSE("GPL v2"); 236