1 /* 2 * ASoC driver for PROTO AudioCODEC (with a WM8731) 3 * 4 * Author: Florian Meier, <koalo@koalo.de> 5 * Copyright 2013 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/module.h> 13 #include <linux/platform_device.h> 14 15 #include <sound/core.h> 16 #include <sound/pcm.h> 17 #include <sound/soc.h> 18 #include <sound/jack.h> 19 20 #include "../codecs/wm8731.h" 21 22 #define XTAL_RATE 12288000 /* This is fixed on this board */ 23 24 static int snd_proto_init(struct snd_soc_pcm_runtime *rtd) 25 { 26 struct snd_soc_card *card = rtd->card; 27 struct snd_soc_dai *codec_dai = rtd->codec_dai; 28 29 /* Set proto sysclk */ 30 int ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL, 31 XTAL_RATE, SND_SOC_CLOCK_IN); 32 if (ret < 0) { 33 dev_err(card->dev, "Failed to set WM8731 SYSCLK: %d\n", 34 ret); 35 return ret; 36 } 37 38 return 0; 39 } 40 41 static const struct snd_soc_dapm_widget snd_proto_widget[] = { 42 SND_SOC_DAPM_MIC("Microphone Jack", NULL), 43 SND_SOC_DAPM_HP("Headphone Jack", NULL), 44 }; 45 46 static const struct snd_soc_dapm_route snd_proto_route[] = { 47 /* speaker connected to LHPOUT/RHPOUT */ 48 {"Headphone Jack", NULL, "LHPOUT"}, 49 {"Headphone Jack", NULL, "RHPOUT"}, 50 51 /* mic is connected to Mic Jack, with WM8731 Mic Bias */ 52 {"MICIN", NULL, "Mic Bias"}, 53 {"Mic Bias", NULL, "Microphone Jack"}, 54 }; 55 56 /* audio machine driver */ 57 static struct snd_soc_card snd_proto = { 58 .name = "snd_mikroe_proto", 59 .owner = THIS_MODULE, 60 .dapm_widgets = snd_proto_widget, 61 .num_dapm_widgets = ARRAY_SIZE(snd_proto_widget), 62 .dapm_routes = snd_proto_route, 63 .num_dapm_routes = ARRAY_SIZE(snd_proto_route), 64 }; 65 66 static int snd_proto_probe(struct platform_device *pdev) 67 { 68 struct snd_soc_dai_link *dai; 69 struct device_node *np = pdev->dev.of_node; 70 struct device_node *codec_np, *cpu_np; 71 struct device_node *bitclkmaster = NULL; 72 struct device_node *framemaster = NULL; 73 unsigned int dai_fmt; 74 int ret = 0; 75 76 if (!np) { 77 dev_err(&pdev->dev, "No device node supplied\n"); 78 return -EINVAL; 79 } 80 81 snd_proto.dev = &pdev->dev; 82 ret = snd_soc_of_parse_card_name(&snd_proto, "model"); 83 if (ret) 84 return ret; 85 86 dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL); 87 if (!dai) 88 return -ENOMEM; 89 90 snd_proto.dai_link = dai; 91 snd_proto.num_links = 1; 92 93 dai->name = "WM8731"; 94 dai->stream_name = "WM8731 HiFi"; 95 dai->codec_dai_name = "wm8731-hifi"; 96 dai->init = &snd_proto_init; 97 98 codec_np = of_parse_phandle(np, "audio-codec", 0); 99 if (!codec_np) { 100 dev_err(&pdev->dev, "audio-codec node missing\n"); 101 return -EINVAL; 102 } 103 dai->codec_of_node = codec_np; 104 105 cpu_np = of_parse_phandle(np, "i2s-controller", 0); 106 if (!cpu_np) { 107 dev_err(&pdev->dev, "i2s-controller missing\n"); 108 return -EINVAL; 109 } 110 dai->cpu_of_node = cpu_np; 111 dai->platform_of_node = cpu_np; 112 113 dai_fmt = snd_soc_of_parse_daifmt(np, NULL, 114 &bitclkmaster, &framemaster); 115 if (bitclkmaster != framemaster) { 116 dev_err(&pdev->dev, "Must be the same bitclock and frame master\n"); 117 return -EINVAL; 118 } 119 if (bitclkmaster) { 120 dai_fmt &= ~SND_SOC_DAIFMT_MASTER_MASK; 121 if (codec_np == bitclkmaster) 122 dai_fmt |= SND_SOC_DAIFMT_CBM_CFM; 123 else 124 dai_fmt |= SND_SOC_DAIFMT_CBS_CFS; 125 } 126 of_node_put(bitclkmaster); 127 of_node_put(framemaster); 128 dai->dai_fmt = dai_fmt; 129 130 of_node_put(codec_np); 131 of_node_put(cpu_np); 132 133 ret = snd_soc_register_card(&snd_proto); 134 if (ret && ret != -EPROBE_DEFER) 135 dev_err(&pdev->dev, 136 "snd_soc_register_card() failed: %d\n", ret); 137 138 return ret; 139 } 140 141 static int snd_proto_remove(struct platform_device *pdev) 142 { 143 return snd_soc_unregister_card(&snd_proto); 144 } 145 146 static const struct of_device_id snd_proto_of_match[] = { 147 { .compatible = "mikroe,mikroe-proto", }, 148 {}, 149 }; 150 MODULE_DEVICE_TABLE(of, snd_proto_of_match); 151 152 static struct platform_driver snd_proto_driver = { 153 .driver = { 154 .name = "snd-mikroe-proto", 155 .of_match_table = snd_proto_of_match, 156 }, 157 .probe = snd_proto_probe, 158 .remove = snd_proto_remove, 159 }; 160 161 module_platform_driver(snd_proto_driver); 162 163 MODULE_AUTHOR("Florian Meier"); 164 MODULE_DESCRIPTION("ASoC Driver for PROTO board (WM8731)"); 165 MODULE_LICENSE("GPL"); 166