| Graeme Gregory | 2dcf9fb | 2009-11-04 17:49:22 +0000 | [diff] [blame^] | 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 | /* |
| 41 | * initialise the ads117x driver |
| 42 | */ |
| 43 | static int ads117x_init(struct snd_soc_device *socdev) |
| 44 | { |
| 45 | struct snd_soc_codec *codec = socdev->card->codec; |
| 46 | int ret = 0; |
| 47 | |
| 48 | codec->name = "ADS117X"; |
| 49 | codec->owner = THIS_MODULE; |
| 50 | codec->dai = &ads117x_dai; |
| 51 | codec->num_dai = 1; |
| 52 | |
| 53 | /* register pcms */ |
| 54 | ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); |
| 55 | if (ret < 0) { |
| 56 | printk(KERN_ERR "ads117x: failed to create pcms\n"); |
| 57 | return ret; |
| 58 | } |
| 59 | |
| 60 | ret = snd_soc_init_card(socdev); |
| 61 | if (ret < 0) { |
| 62 | printk(KERN_ERR "ads117x: failed to register card\n"); |
| 63 | goto card_err; |
| 64 | } |
| 65 | return ret; |
| 66 | |
| 67 | card_err: |
| 68 | snd_soc_free_pcms(socdev); |
| 69 | return ret; |
| 70 | } |
| 71 | |
| 72 | static int ads117x_probe(struct platform_device *pdev) |
| 73 | { |
| 74 | struct snd_soc_device *socdev = platform_get_drvdata(pdev); |
| 75 | struct snd_soc_codec *codec; |
| 76 | int ret; |
| 77 | |
| 78 | pr_info("ads117x ADC\n"); |
| 79 | |
| 80 | codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL); |
| 81 | if (codec == NULL) |
| 82 | return -ENOMEM; |
| 83 | |
| 84 | socdev->card->codec = codec; |
| 85 | mutex_init(&codec->mutex); |
| 86 | INIT_LIST_HEAD(&codec->dapm_widgets); |
| 87 | INIT_LIST_HEAD(&codec->dapm_paths); |
| 88 | |
| 89 | ret = ads117x_init(socdev); |
| 90 | if (ret != 0) |
| 91 | kfree(codec); |
| 92 | |
| 93 | return ret; |
| 94 | } |
| 95 | |
| 96 | static int ads117x_remove(struct platform_device *pdev) |
| 97 | { |
| 98 | struct snd_soc_device *socdev = platform_get_drvdata(pdev); |
| 99 | struct snd_soc_codec *codec = socdev->card->codec; |
| 100 | |
| 101 | snd_soc_free_pcms(socdev); |
| 102 | kfree(codec); |
| 103 | |
| 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | struct snd_soc_codec_device soc_codec_dev_ads117x = { |
| 108 | .probe = ads117x_probe, |
| 109 | .remove = ads117x_remove, |
| 110 | }; |
| 111 | EXPORT_SYMBOL_GPL(soc_codec_dev_ads117x); |
| 112 | |
| 113 | static int __init ads117x_modinit(void) |
| 114 | { |
| 115 | return snd_soc_register_dai(&ads117x_dai); |
| 116 | } |
| 117 | module_init(ads117x_modinit); |
| 118 | |
| 119 | static void __exit ads117x_exit(void) |
| 120 | { |
| 121 | snd_soc_unregister_dai(&ads117x_dai); |
| 122 | } |
| 123 | module_exit(ads117x_exit); |
| 124 | |
| 125 | MODULE_DESCRIPTION("ASoC ads117x driver"); |
| 126 | MODULE_AUTHOR("Graeme Gregory"); |
| 127 | MODULE_LICENSE("GPL"); |