1 /* 2 * ac97.c -- ALSA Soc AC97 codec support 3 * 4 * Copyright 2005 Wolfson Microelectronics PLC. 5 * Author: Liam Girdwood <lrg@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 * Generic AC97 support. 13 */ 14 15 #include <linux/init.h> 16 #include <linux/kernel.h> 17 #include <linux/device.h> 18 #include <sound/core.h> 19 #include <sound/pcm.h> 20 #include <sound/ac97_codec.h> 21 #include <sound/initval.h> 22 #include <sound/soc.h> 23 #include "ac97.h" 24 25 #define AC97_VERSION "0.6" 26 27 static int ac97_prepare(struct snd_pcm_substream *substream, 28 struct snd_soc_dai *dai) 29 { 30 struct snd_pcm_runtime *runtime = substream->runtime; 31 struct snd_soc_pcm_runtime *rtd = substream->private_data; 32 struct snd_soc_device *socdev = rtd->socdev; 33 struct snd_soc_codec *codec = socdev->card->codec; 34 35 int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? 36 AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE; 37 return snd_ac97_set_rate(codec->ac97, reg, runtime->rate); 38 } 39 40 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\ 41 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\ 42 SNDRV_PCM_RATE_48000) 43 44 static struct snd_soc_dai_ops ac97_dai_ops = { 45 .prepare = ac97_prepare, 46 }; 47 48 struct snd_soc_dai ac97_dai = { 49 .name = "AC97 HiFi", 50 .ac97_control = 1, 51 .playback = { 52 .stream_name = "AC97 Playback", 53 .channels_min = 1, 54 .channels_max = 2, 55 .rates = STD_AC97_RATES, 56 .formats = SND_SOC_STD_AC97_FMTS,}, 57 .capture = { 58 .stream_name = "AC97 Capture", 59 .channels_min = 1, 60 .channels_max = 2, 61 .rates = STD_AC97_RATES, 62 .formats = SND_SOC_STD_AC97_FMTS,}, 63 .ops = &ac97_dai_ops, 64 }; 65 EXPORT_SYMBOL_GPL(ac97_dai); 66 67 static unsigned int ac97_read(struct snd_soc_codec *codec, 68 unsigned int reg) 69 { 70 return soc_ac97_ops.read(codec->ac97, reg); 71 } 72 73 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg, 74 unsigned int val) 75 { 76 soc_ac97_ops.write(codec->ac97, reg, val); 77 return 0; 78 } 79 80 static int ac97_soc_probe(struct platform_device *pdev) 81 { 82 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 83 struct snd_soc_codec *codec; 84 struct snd_ac97_bus *ac97_bus; 85 struct snd_ac97_template ac97_template; 86 int ret = 0; 87 88 printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION); 89 90 socdev->card->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL); 91 if (!socdev->card->codec) 92 return -ENOMEM; 93 codec = socdev->card->codec; 94 mutex_init(&codec->mutex); 95 96 codec->name = "AC97"; 97 codec->owner = THIS_MODULE; 98 codec->dai = &ac97_dai; 99 codec->num_dai = 1; 100 codec->write = ac97_write; 101 codec->read = ac97_read; 102 INIT_LIST_HEAD(&codec->dapm_widgets); 103 INIT_LIST_HEAD(&codec->dapm_paths); 104 105 /* register pcms */ 106 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); 107 if (ret < 0) 108 goto err; 109 110 /* add codec as bus device for standard ac97 */ 111 ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus); 112 if (ret < 0) 113 goto bus_err; 114 115 memset(&ac97_template, 0, sizeof(struct snd_ac97_template)); 116 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97); 117 if (ret < 0) 118 goto bus_err; 119 120 ret = snd_soc_init_card(socdev); 121 if (ret < 0) 122 goto bus_err; 123 return 0; 124 125 bus_err: 126 snd_soc_free_pcms(socdev); 127 128 err: 129 kfree(socdev->card->codec); 130 socdev->card->codec = NULL; 131 return ret; 132 } 133 134 static int ac97_soc_remove(struct platform_device *pdev) 135 { 136 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 137 struct snd_soc_codec *codec = socdev->card->codec; 138 139 if (!codec) 140 return 0; 141 142 snd_soc_free_pcms(socdev); 143 kfree(socdev->card->codec); 144 145 return 0; 146 } 147 148 #ifdef CONFIG_PM 149 static int ac97_soc_suspend(struct platform_device *pdev, pm_message_t msg) 150 { 151 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 152 153 snd_ac97_suspend(socdev->card->codec->ac97); 154 155 return 0; 156 } 157 158 static int ac97_soc_resume(struct platform_device *pdev) 159 { 160 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 161 162 snd_ac97_resume(socdev->card->codec->ac97); 163 164 return 0; 165 } 166 #else 167 #define ac97_soc_suspend NULL 168 #define ac97_soc_resume NULL 169 #endif 170 171 struct snd_soc_codec_device soc_codec_dev_ac97 = { 172 .probe = ac97_soc_probe, 173 .remove = ac97_soc_remove, 174 .suspend = ac97_soc_suspend, 175 .resume = ac97_soc_resume, 176 }; 177 EXPORT_SYMBOL_GPL(soc_codec_dev_ac97); 178 179 MODULE_DESCRIPTION("Soc Generic AC97 driver"); 180 MODULE_AUTHOR("Liam Girdwood"); 181 MODULE_LICENSE("GPL"); 182