1 /* 2 * wm8727.c 3 * 4 * Created on: 15-Oct-2009 5 * Author: neil.jones@imgtec.com 6 * 7 * Copyright (C) 2009 Imagination Technologies Ltd. 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 */ 14 15 #include <linux/init.h> 16 #include <linux/slab.h> 17 #include <linux/module.h> 18 #include <linux/kernel.h> 19 #include <linux/device.h> 20 #include <sound/core.h> 21 #include <sound/pcm.h> 22 #include <sound/ac97_codec.h> 23 #include <sound/initval.h> 24 #include <sound/soc.h> 25 26 #include "wm8727.h" 27 /* 28 * Note this is a simple chip with no configuration interface, sample rate is 29 * determined automatically by examining the Master clock and Bit clock ratios 30 */ 31 #define WM8727_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\ 32 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 |\ 33 SNDRV_PCM_RATE_192000) 34 35 36 struct snd_soc_dai wm8727_dai = { 37 .name = "WM8727", 38 .playback = { 39 .stream_name = "Playback", 40 .channels_min = 2, 41 .channels_max = 2, 42 .rates = WM8727_RATES, 43 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE, 44 }, 45 }; 46 EXPORT_SYMBOL_GPL(wm8727_dai); 47 48 static struct snd_soc_codec *wm8727_codec; 49 50 static int wm8727_soc_probe(struct platform_device *pdev) 51 { 52 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 53 int ret = 0; 54 55 BUG_ON(!wm8727_codec); 56 57 socdev->card->codec = wm8727_codec; 58 59 /* register pcms */ 60 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); 61 if (ret < 0) { 62 printk(KERN_ERR "wm8727: failed to create pcms\n"); 63 goto pcm_err; 64 } 65 66 return ret; 67 68 pcm_err: 69 kfree(socdev->card->codec); 70 socdev->card->codec = NULL; 71 return ret; 72 } 73 74 static int wm8727_soc_remove(struct platform_device *pdev) 75 { 76 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 77 78 snd_soc_free_pcms(socdev); 79 80 return 0; 81 } 82 83 struct snd_soc_codec_device soc_codec_dev_wm8727 = { 84 .probe = wm8727_soc_probe, 85 .remove = wm8727_soc_remove, 86 }; 87 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8727); 88 89 90 static __devinit int wm8727_platform_probe(struct platform_device *pdev) 91 { 92 struct snd_soc_codec *codec; 93 int ret; 94 95 if (wm8727_codec) { 96 dev_err(&pdev->dev, "Another WM8727 is registered\n"); 97 return -EBUSY; 98 } 99 100 codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL); 101 if (codec == NULL) 102 return -ENOMEM; 103 wm8727_codec = codec; 104 105 platform_set_drvdata(pdev, codec); 106 107 mutex_init(&codec->mutex); 108 codec->dev = &pdev->dev; 109 codec->name = "WM8727"; 110 codec->owner = THIS_MODULE; 111 codec->dai = &wm8727_dai; 112 codec->num_dai = 1; 113 INIT_LIST_HEAD(&codec->dapm_widgets); 114 INIT_LIST_HEAD(&codec->dapm_paths); 115 116 wm8727_dai.dev = &pdev->dev; 117 118 ret = snd_soc_register_codec(codec); 119 if (ret != 0) { 120 dev_err(&pdev->dev, "Failed to register CODEC: %d\n", ret); 121 goto err; 122 } 123 124 ret = snd_soc_register_dai(&wm8727_dai); 125 if (ret != 0) { 126 dev_err(&pdev->dev, "Failed to register DAI: %d\n", ret); 127 goto err_codec; 128 } 129 130 err_codec: 131 snd_soc_unregister_codec(codec); 132 err: 133 kfree(codec); 134 return ret; 135 } 136 137 static int __devexit wm8727_platform_remove(struct platform_device *pdev) 138 { 139 snd_soc_unregister_dai(&wm8727_dai); 140 snd_soc_unregister_codec(platform_get_drvdata(pdev)); 141 return 0; 142 } 143 144 static struct platform_driver wm8727_codec_driver = { 145 .driver = { 146 .name = "wm8727-codec", 147 .owner = THIS_MODULE, 148 }, 149 150 .probe = wm8727_platform_probe, 151 .remove = __devexit_p(wm8727_platform_remove), 152 }; 153 154 static int __init wm8727_init(void) 155 { 156 return platform_driver_register(&wm8727_codec_driver); 157 } 158 module_init(wm8727_init); 159 160 static void __exit wm8727_exit(void) 161 { 162 platform_driver_unregister(&wm8727_codec_driver); 163 } 164 module_exit(wm8727_exit); 165 166 MODULE_DESCRIPTION("ASoC wm8727 driver"); 167 MODULE_AUTHOR("Neil Jones"); 168 MODULE_LICENSE("GPL"); 169