1 /* 2 * ads117x.c -- Driver for ads1174/8 ADC chips 3 * 4 * Copyright 2009 ShotSpotter Inc. 5 * Author: Graeme Gregory <gg@slimlogic.co.uk> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2 of the License, or (at your 10 * option) any later version. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/init.h> 15 #include <linux/device.h> 16 #include <sound/core.h> 17 #include <sound/pcm.h> 18 #include <sound/initval.h> 19 #include <sound/soc.h> 20 21 #include "ads117x.h" 22 23 #define ADS117X_RATES (SNDRV_PCM_RATE_8000_48000) 24 25 #define ADS117X_FORMATS (SNDRV_PCM_FMTBIT_S16_LE) 26 27 struct snd_soc_dai ads117x_dai = { 28 /* ADC */ 29 .name = "ADS117X ADC", 30 .id = 1, 31 .capture = { 32 .stream_name = "Capture", 33 .channels_min = 1, 34 .channels_max = 32, 35 .rates = ADS117X_RATES, 36 .formats = ADS117X_FORMATS,}, 37 }; 38 EXPORT_SYMBOL_GPL(ads117x_dai); 39 40 static int ads117x_probe(struct platform_device *pdev) 41 { 42 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 43 struct snd_soc_codec *codec; 44 int ret; 45 46 codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL); 47 if (codec == NULL) 48 return -ENOMEM; 49 50 socdev->card->codec = codec; 51 mutex_init(&codec->mutex); 52 INIT_LIST_HEAD(&codec->dapm_widgets); 53 INIT_LIST_HEAD(&codec->dapm_paths); 54 codec->name = "ADS117X"; 55 codec->owner = THIS_MODULE; 56 codec->dai = &ads117x_dai; 57 codec->num_dai = 1; 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 "ads117x: failed to create pcms\n"); 63 kfree(codec); 64 return ret; 65 } 66 67 return 0; 68 } 69 70 static int ads117x_remove(struct platform_device *pdev) 71 { 72 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 73 struct snd_soc_codec *codec = socdev->card->codec; 74 75 snd_soc_free_pcms(socdev); 76 kfree(codec); 77 78 return 0; 79 } 80 81 struct snd_soc_codec_device soc_codec_dev_ads117x = { 82 .probe = ads117x_probe, 83 .remove = ads117x_remove, 84 }; 85 EXPORT_SYMBOL_GPL(soc_codec_dev_ads117x); 86 87 static __devinit int ads117x_platform_probe(struct platform_device *pdev) 88 { 89 ads117x_dai.dev = &pdev->dev; 90 return snd_soc_register_dai(&ads117x_dai); 91 } 92 93 static int __devexit ads117x_platform_remove(struct platform_device *pdev) 94 { 95 snd_soc_unregister_dai(&ads117x_dai); 96 return 0; 97 } 98 99 static struct platform_driver ads117x_codec_driver = { 100 .driver = { 101 .name = "ads117x", 102 .owner = THIS_MODULE, 103 }, 104 105 .probe = ads117x_platform_probe, 106 .remove = __devexit_p(ads117x_platform_remove), 107 }; 108 109 static int __init ads117x_init(void) 110 { 111 return platform_driver_register(&ads117x_codec_driver); 112 } 113 module_init(ads117x_init); 114 115 static void __exit ads117x_exit(void) 116 { 117 platform_driver_unregister(&ads117x_codec_driver); 118 } 119 module_exit(ads117x_exit); 120 121 MODULE_DESCRIPTION("ASoC ads117x driver"); 122 MODULE_AUTHOR("Graeme Gregory"); 123 MODULE_LICENSE("GPL"); 124