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/slab.h> 15 #include <linux/init.h> 16 #include <linux/device.h> 17 #include <sound/core.h> 18 #include <sound/pcm.h> 19 #include <sound/initval.h> 20 #include <sound/soc.h> 21 22 #include "ads117x.h" 23 24 #define ADS117X_RATES (SNDRV_PCM_RATE_8000_48000) 25 26 #define ADS117X_FORMATS (SNDRV_PCM_FMTBIT_S16_LE) 27 28 struct snd_soc_dai ads117x_dai = { 29 /* ADC */ 30 .name = "ADS117X ADC", 31 .id = 1, 32 .capture = { 33 .stream_name = "Capture", 34 .channels_min = 1, 35 .channels_max = 32, 36 .rates = ADS117X_RATES, 37 .formats = ADS117X_FORMATS,}, 38 }; 39 EXPORT_SYMBOL_GPL(ads117x_dai); 40 41 static int ads117x_probe(struct platform_device *pdev) 42 { 43 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 44 struct snd_soc_codec *codec; 45 int ret; 46 47 codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL); 48 if (codec == NULL) 49 return -ENOMEM; 50 51 socdev->card->codec = codec; 52 mutex_init(&codec->mutex); 53 INIT_LIST_HEAD(&codec->dapm_widgets); 54 INIT_LIST_HEAD(&codec->dapm_paths); 55 codec->name = "ADS117X"; 56 codec->owner = THIS_MODULE; 57 codec->dai = &ads117x_dai; 58 codec->num_dai = 1; 59 60 /* register pcms */ 61 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); 62 if (ret < 0) { 63 printk(KERN_ERR "ads117x: failed to create pcms\n"); 64 kfree(codec); 65 return ret; 66 } 67 68 return 0; 69 } 70 71 static int ads117x_remove(struct platform_device *pdev) 72 { 73 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 74 struct snd_soc_codec *codec = socdev->card->codec; 75 76 snd_soc_free_pcms(socdev); 77 kfree(codec); 78 79 return 0; 80 } 81 82 struct snd_soc_codec_device soc_codec_dev_ads117x = { 83 .probe = ads117x_probe, 84 .remove = ads117x_remove, 85 }; 86 EXPORT_SYMBOL_GPL(soc_codec_dev_ads117x); 87 88 static __devinit int ads117x_platform_probe(struct platform_device *pdev) 89 { 90 ads117x_dai.dev = &pdev->dev; 91 return snd_soc_register_dai(&ads117x_dai); 92 } 93 94 static int __devexit ads117x_platform_remove(struct platform_device *pdev) 95 { 96 snd_soc_unregister_dai(&ads117x_dai); 97 return 0; 98 } 99 100 static struct platform_driver ads117x_codec_driver = { 101 .driver = { 102 .name = "ads117x", 103 .owner = THIS_MODULE, 104 }, 105 106 .probe = ads117x_platform_probe, 107 .remove = __devexit_p(ads117x_platform_remove), 108 }; 109 110 static int __init ads117x_init(void) 111 { 112 return platform_driver_register(&ads117x_codec_driver); 113 } 114 module_init(ads117x_init); 115 116 static void __exit ads117x_exit(void) 117 { 118 platform_driver_unregister(&ads117x_codec_driver); 119 } 120 module_exit(ads117x_exit); 121 122 MODULE_DESCRIPTION("ASoC ads117x driver"); 123 MODULE_AUTHOR("Graeme Gregory"); 124 MODULE_LICENSE("GPL"); 125