1 /* 2 * ac97.c -- ALSA Soc AC97 codec support 3 * 4 * Copyright 2005 Wolfson Microelectronics PLC. 5 * Author: Liam Girdwood 6 * liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 * 13 * Revision history 14 * 17th Oct 2005 Initial version. 15 * 16 * Generic AC97 support. 17 */ 18 19 #include <linux/init.h> 20 #include <linux/kernel.h> 21 #include <linux/device.h> 22 #include <sound/core.h> 23 #include <sound/pcm.h> 24 #include <sound/ac97_codec.h> 25 #include <sound/initval.h> 26 #include <sound/soc.h> 27 28 #define AC97_VERSION "0.6" 29 30 static int ac97_prepare(struct snd_pcm_substream *substream) 31 { 32 struct snd_pcm_runtime *runtime = substream->runtime; 33 struct snd_soc_pcm_runtime *rtd = substream->private_data; 34 struct snd_soc_device *socdev = rtd->socdev; 35 struct snd_soc_codec *codec = socdev->codec; 36 37 int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? 38 AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE; 39 return snd_ac97_set_rate(codec->ac97, reg, runtime->rate); 40 } 41 42 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\ 43 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000) 44 45 struct snd_soc_codec_dai ac97_dai = { 46 .name = "AC97 HiFi", 47 .type = SND_SOC_DAI_AC97, 48 .playback = { 49 .stream_name = "AC97 Playback", 50 .channels_min = 1, 51 .channels_max = 2, 52 .rates = STD_AC97_RATES, 53 .formats = SNDRV_PCM_FMTBIT_S16_LE,}, 54 .capture = { 55 .stream_name = "AC97 Capture", 56 .channels_min = 1, 57 .channels_max = 2, 58 .rates = STD_AC97_RATES, 59 .formats = SNDRV_PCM_FMTBIT_S16_LE,}, 60 .ops = { 61 .prepare = ac97_prepare,}, 62 }; 63 EXPORT_SYMBOL_GPL(ac97_dai); 64 65 static unsigned int ac97_read(struct snd_soc_codec *codec, 66 unsigned int reg) 67 { 68 return soc_ac97_ops.read(codec->ac97, reg); 69 } 70 71 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg, 72 unsigned int val) 73 { 74 soc_ac97_ops.write(codec->ac97, reg, val); 75 return 0; 76 } 77 78 static int ac97_soc_probe(struct platform_device *pdev) 79 { 80 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 81 struct snd_soc_codec *codec; 82 struct snd_ac97_bus *ac97_bus; 83 struct snd_ac97_template ac97_template; 84 int ret = 0; 85 86 printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION); 87 88 socdev->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL); 89 if (socdev->codec == NULL) 90 return -ENOMEM; 91 codec = socdev->codec; 92 mutex_init(&codec->mutex); 93 94 codec->name = "AC97"; 95 codec->owner = THIS_MODULE; 96 codec->dai = &ac97_dai; 97 codec->num_dai = 1; 98 codec->write = ac97_write; 99 codec->read = ac97_read; 100 INIT_LIST_HEAD(&codec->dapm_widgets); 101 INIT_LIST_HEAD(&codec->dapm_paths); 102 103 /* register pcms */ 104 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); 105 if(ret < 0) 106 goto err; 107 108 /* add codec as bus device for standard ac97 */ 109 ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus); 110 if(ret < 0) 111 goto bus_err; 112 113 memset(&ac97_template, 0, sizeof(struct snd_ac97_template)); 114 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97); 115 if(ret < 0) 116 goto bus_err; 117 118 ret = snd_soc_register_card(socdev); 119 if (ret < 0) 120 goto bus_err; 121 return 0; 122 123 bus_err: 124 snd_soc_free_pcms(socdev); 125 126 err: 127 kfree(socdev->codec->reg_cache); 128 kfree(socdev->codec); 129 socdev->codec = NULL; 130 return ret; 131 } 132 133 static int ac97_soc_remove(struct platform_device *pdev) 134 { 135 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 136 struct snd_soc_codec *codec = socdev->codec; 137 138 if(codec == NULL) 139 return 0; 140 141 snd_soc_free_pcms(socdev); 142 kfree(socdev->codec->reg_cache); 143 kfree(socdev->codec); 144 145 return 0; 146 } 147 148 struct snd_soc_codec_device soc_codec_dev_ac97= { 149 .probe = ac97_soc_probe, 150 .remove = ac97_soc_remove, 151 }; 152 153 EXPORT_SYMBOL_GPL(soc_codec_dev_ac97); 154 155 MODULE_DESCRIPTION("Soc Generic AC97 driver"); 156 MODULE_AUTHOR("Liam Girdwood"); 157 MODULE_LICENSE("GPL"); 158