1 /* 2 * sam9x5_wm8731 -- SoC audio for AT91SAM9X5-based boards 3 * that are using WM8731 as codec. 4 * 5 * Copyright (C) 2011 Atmel, 6 * Nicolas Ferre <nicolas.ferre@atmel.com> 7 * 8 * Copyright (C) 2013 Paratronic, 9 * Richard Genoud <richard.genoud@gmail.com> 10 * 11 * Based on sam9g20_wm8731.c by: 12 * Sedji Gaouaou <sedji.gaouaou@atmel.com> 13 * 14 * This program is free software; you can redistribute it and/or modify it 15 * under the terms of the GNU General Public License as published by the 16 * Free Software Foundation; either version 2 of the License, or (at your 17 * option) any later version. 18 * 19 */ 20 #include <linux/of.h> 21 #include <linux/export.h> 22 #include <linux/module.h> 23 #include <linux/mod_devicetable.h> 24 #include <linux/platform_device.h> 25 #include <linux/device.h> 26 27 #include <sound/soc.h> 28 #include <sound/soc-dai.h> 29 #include <sound/soc-dapm.h> 30 31 #include "../codecs/wm8731.h" 32 #include "atmel_ssc_dai.h" 33 34 35 #define MCLK_RATE 12288000 36 37 #define DRV_NAME "sam9x5-snd-wm8731" 38 39 struct sam9x5_drvdata { 40 int ssc_id; 41 }; 42 43 /* 44 * Logic for a wm8731 as connected on a at91sam9x5ek based board. 45 */ 46 static int sam9x5_wm8731_init(struct snd_soc_pcm_runtime *rtd) 47 { 48 struct snd_soc_dai *codec_dai = rtd->codec_dai; 49 struct device *dev = rtd->dev; 50 int ret; 51 52 dev_dbg(dev, "ASoC: %s called\n", __func__); 53 54 /* set the codec system clock for DAC and ADC */ 55 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL, 56 MCLK_RATE, SND_SOC_CLOCK_IN); 57 if (ret < 0) { 58 dev_err(dev, "ASoC: Failed to set WM8731 SYSCLK: %d\n", ret); 59 return ret; 60 } 61 62 return 0; 63 } 64 65 /* 66 * Audio paths on at91sam9x5ek board: 67 * 68 * |A| ------------> | | ---R----> Headphone Jack 69 * |T| <----\ | WM | ---L--/ 70 * |9| ---> CLK <--> | 8731 | <--R----- Line In Jack 71 * |1| <------------ | | <--L--/ 72 */ 73 static const struct snd_soc_dapm_widget sam9x5_dapm_widgets[] = { 74 SND_SOC_DAPM_HP("Headphone Jack", NULL), 75 SND_SOC_DAPM_LINE("Line In Jack", NULL), 76 }; 77 78 static int sam9x5_wm8731_driver_probe(struct platform_device *pdev) 79 { 80 struct device_node *np = pdev->dev.of_node; 81 struct device_node *codec_np, *cpu_np; 82 struct snd_soc_card *card; 83 struct snd_soc_dai_link *dai; 84 struct sam9x5_drvdata *priv; 85 int ret; 86 87 if (!np) { 88 dev_err(&pdev->dev, "No device node supplied\n"); 89 return -EINVAL; 90 } 91 92 card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL); 93 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); 94 dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL); 95 if (!dai || !card || !priv) { 96 ret = -ENOMEM; 97 goto out; 98 } 99 100 snd_soc_card_set_drvdata(card, priv); 101 102 card->dev = &pdev->dev; 103 card->owner = THIS_MODULE; 104 card->dai_link = dai; 105 card->num_links = 1; 106 card->dapm_widgets = sam9x5_dapm_widgets; 107 card->num_dapm_widgets = ARRAY_SIZE(sam9x5_dapm_widgets); 108 dai->name = "WM8731"; 109 dai->stream_name = "WM8731 PCM"; 110 dai->codec_dai_name = "wm8731-hifi"; 111 dai->init = sam9x5_wm8731_init; 112 dai->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF 113 | SND_SOC_DAIFMT_CBM_CFM; 114 115 ret = snd_soc_of_parse_card_name(card, "atmel,model"); 116 if (ret) { 117 dev_err(&pdev->dev, "atmel,model node missing\n"); 118 goto out; 119 } 120 121 ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing"); 122 if (ret) { 123 dev_err(&pdev->dev, "atmel,audio-routing node missing\n"); 124 goto out; 125 } 126 127 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0); 128 if (!codec_np) { 129 dev_err(&pdev->dev, "atmel,audio-codec node missing\n"); 130 ret = -EINVAL; 131 goto out; 132 } 133 134 dai->codec_of_node = codec_np; 135 136 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0); 137 if (!cpu_np) { 138 dev_err(&pdev->dev, "atmel,ssc-controller node missing\n"); 139 ret = -EINVAL; 140 goto out; 141 } 142 dai->cpu_of_node = cpu_np; 143 dai->platform_of_node = cpu_np; 144 145 priv->ssc_id = of_alias_get_id(cpu_np, "ssc"); 146 147 ret = atmel_ssc_set_audio(priv->ssc_id); 148 if (ret != 0) { 149 dev_err(&pdev->dev, 150 "ASoC: Failed to set SSC %d for audio: %d\n", 151 ret, priv->ssc_id); 152 goto out; 153 } 154 155 of_node_put(codec_np); 156 of_node_put(cpu_np); 157 158 platform_set_drvdata(pdev, card); 159 160 ret = snd_soc_register_card(card); 161 if (ret) { 162 dev_err(&pdev->dev, 163 "ASoC: Platform device allocation failed\n"); 164 goto out_put_audio; 165 } 166 167 dev_dbg(&pdev->dev, "ASoC: %s ok\n", __func__); 168 169 return ret; 170 171 out_put_audio: 172 atmel_ssc_put_audio(priv->ssc_id); 173 out: 174 return ret; 175 } 176 177 static int sam9x5_wm8731_driver_remove(struct platform_device *pdev) 178 { 179 struct snd_soc_card *card = platform_get_drvdata(pdev); 180 struct sam9x5_drvdata *priv = card->drvdata; 181 182 snd_soc_unregister_card(card); 183 atmel_ssc_put_audio(priv->ssc_id); 184 185 return 0; 186 } 187 188 static const struct of_device_id sam9x5_wm8731_of_match[] = { 189 { .compatible = "atmel,sam9x5-wm8731-audio", }, 190 {}, 191 }; 192 MODULE_DEVICE_TABLE(of, sam9x5_wm8731_of_match); 193 194 static struct platform_driver sam9x5_wm8731_driver = { 195 .driver = { 196 .name = DRV_NAME, 197 .owner = THIS_MODULE, 198 .of_match_table = of_match_ptr(sam9x5_wm8731_of_match), 199 }, 200 .probe = sam9x5_wm8731_driver_probe, 201 .remove = sam9x5_wm8731_driver_remove, 202 }; 203 module_platform_driver(sam9x5_wm8731_driver); 204 205 /* Module information */ 206 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>"); 207 MODULE_AUTHOR("Richard Genoud <richard.genoud@gmail.com>"); 208 MODULE_DESCRIPTION("ALSA SoC machine driver for AT91SAM9x5 - WM8731"); 209 MODULE_LICENSE("GPL"); 210 MODULE_ALIAS("platform:" DRV_NAME); 211