1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * sam9x5_wm8731 -- SoC audio for AT91SAM9X5-based boards 4 * that are using WM8731 as codec. 5 * 6 * Copyright (C) 2011 Atmel, 7 * Nicolas Ferre <nicolas.ferre@atmel.com> 8 * 9 * Copyright (C) 2013 Paratronic, 10 * Richard Genoud <richard.genoud@gmail.com> 11 * 12 * Based on sam9g20_wm8731.c by: 13 * Sedji Gaouaou <sedji.gaouaou@atmel.com> 14 */ 15 #include <linux/of.h> 16 #include <linux/export.h> 17 #include <linux/module.h> 18 #include <linux/mod_devicetable.h> 19 #include <linux/platform_device.h> 20 #include <linux/device.h> 21 22 #include <sound/soc.h> 23 #include <sound/soc-dai.h> 24 #include <sound/soc-dapm.h> 25 26 #include "../codecs/wm8731.h" 27 #include "atmel_ssc_dai.h" 28 29 30 #define MCLK_RATE 12288000 31 32 #define DRV_NAME "sam9x5-snd-wm8731" 33 34 struct sam9x5_drvdata { 35 int ssc_id; 36 }; 37 38 /* 39 * Logic for a wm8731 as connected on a at91sam9x5ek based board. 40 */ 41 static int sam9x5_wm8731_init(struct snd_soc_pcm_runtime *rtd) 42 { 43 struct snd_soc_dai *codec_dai = rtd->codec_dai; 44 struct device *dev = rtd->dev; 45 int ret; 46 47 dev_dbg(dev, "%s called\n", __func__); 48 49 /* set the codec system clock for DAC and ADC */ 50 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL, 51 MCLK_RATE, SND_SOC_CLOCK_IN); 52 if (ret < 0) { 53 dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret); 54 return ret; 55 } 56 57 return 0; 58 } 59 60 /* 61 * Audio paths on at91sam9x5ek board: 62 * 63 * |A| ------------> | | ---R----> Headphone Jack 64 * |T| <----\ | WM | ---L--/ 65 * |9| ---> CLK <--> | 8731 | <--R----- Line In Jack 66 * |1| <------------ | | <--L--/ 67 */ 68 static const struct snd_soc_dapm_widget sam9x5_dapm_widgets[] = { 69 SND_SOC_DAPM_HP("Headphone Jack", NULL), 70 SND_SOC_DAPM_LINE("Line In Jack", NULL), 71 }; 72 73 static int sam9x5_wm8731_driver_probe(struct platform_device *pdev) 74 { 75 struct device_node *np = pdev->dev.of_node; 76 struct device_node *codec_np, *cpu_np; 77 struct snd_soc_card *card; 78 struct snd_soc_dai_link *dai; 79 struct sam9x5_drvdata *priv; 80 int ret; 81 82 if (!np) { 83 dev_err(&pdev->dev, "No device node supplied\n"); 84 return -EINVAL; 85 } 86 87 card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL); 88 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); 89 dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL); 90 if (!dai || !card || !priv) { 91 ret = -ENOMEM; 92 goto out; 93 } 94 95 snd_soc_card_set_drvdata(card, priv); 96 97 card->dev = &pdev->dev; 98 card->owner = THIS_MODULE; 99 card->dai_link = dai; 100 card->num_links = 1; 101 card->dapm_widgets = sam9x5_dapm_widgets; 102 card->num_dapm_widgets = ARRAY_SIZE(sam9x5_dapm_widgets); 103 dai->name = "WM8731"; 104 dai->stream_name = "WM8731 PCM"; 105 dai->codec_dai_name = "wm8731-hifi"; 106 dai->init = sam9x5_wm8731_init; 107 dai->dai_fmt = SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF 108 | SND_SOC_DAIFMT_CBM_CFM; 109 110 ret = snd_soc_of_parse_card_name(card, "atmel,model"); 111 if (ret) { 112 dev_err(&pdev->dev, "atmel,model node missing\n"); 113 goto out; 114 } 115 116 ret = snd_soc_of_parse_audio_routing(card, "atmel,audio-routing"); 117 if (ret) { 118 dev_err(&pdev->dev, "atmel,audio-routing node missing\n"); 119 goto out; 120 } 121 122 codec_np = of_parse_phandle(np, "atmel,audio-codec", 0); 123 if (!codec_np) { 124 dev_err(&pdev->dev, "atmel,audio-codec node missing\n"); 125 ret = -EINVAL; 126 goto out; 127 } 128 129 dai->codec_of_node = codec_np; 130 131 cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0); 132 if (!cpu_np) { 133 dev_err(&pdev->dev, "atmel,ssc-controller node missing\n"); 134 ret = -EINVAL; 135 goto out; 136 } 137 dai->cpu_of_node = cpu_np; 138 dai->platform_of_node = cpu_np; 139 140 priv->ssc_id = of_alias_get_id(cpu_np, "ssc"); 141 142 ret = atmel_ssc_set_audio(priv->ssc_id); 143 if (ret != 0) { 144 dev_err(&pdev->dev, "Failed to set SSC %d for audio: %d\n", 145 ret, priv->ssc_id); 146 goto out; 147 } 148 149 of_node_put(codec_np); 150 of_node_put(cpu_np); 151 152 ret = snd_soc_register_card(card); 153 if (ret) { 154 dev_err(&pdev->dev, "Platform device allocation failed\n"); 155 goto out_put_audio; 156 } 157 158 dev_dbg(&pdev->dev, "%s ok\n", __func__); 159 160 return ret; 161 162 out_put_audio: 163 atmel_ssc_put_audio(priv->ssc_id); 164 out: 165 return ret; 166 } 167 168 static int sam9x5_wm8731_driver_remove(struct platform_device *pdev) 169 { 170 struct snd_soc_card *card = platform_get_drvdata(pdev); 171 struct sam9x5_drvdata *priv = card->drvdata; 172 173 snd_soc_unregister_card(card); 174 atmel_ssc_put_audio(priv->ssc_id); 175 176 return 0; 177 } 178 179 static const struct of_device_id sam9x5_wm8731_of_match[] = { 180 { .compatible = "atmel,sam9x5-wm8731-audio", }, 181 {}, 182 }; 183 MODULE_DEVICE_TABLE(of, sam9x5_wm8731_of_match); 184 185 static struct platform_driver sam9x5_wm8731_driver = { 186 .driver = { 187 .name = DRV_NAME, 188 .of_match_table = of_match_ptr(sam9x5_wm8731_of_match), 189 }, 190 .probe = sam9x5_wm8731_driver_probe, 191 .remove = sam9x5_wm8731_driver_remove, 192 }; 193 module_platform_driver(sam9x5_wm8731_driver); 194 195 /* Module information */ 196 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>"); 197 MODULE_AUTHOR("Richard Genoud <richard.genoud@gmail.com>"); 198 MODULE_DESCRIPTION("ALSA SoC machine driver for AT91SAM9x5 - WM8731"); 199 MODULE_LICENSE("GPL"); 200 MODULE_ALIAS("platform:" DRV_NAME); 201