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/slab.h> 17 #include <linux/kernel.h> 18 #include <linux/device.h> 19 #include <sound/core.h> 20 #include <sound/pcm.h> 21 #include <sound/ac97_codec.h> 22 #include <sound/initval.h> 23 #include <sound/soc.h> 24 #include "ac97.h" 25 26 #define AC97_VERSION "0.6" 27 28 static int ac97_prepare(struct snd_pcm_substream *substream, 29 struct snd_soc_dai *dai) 30 { 31 struct snd_pcm_runtime *runtime = substream->runtime; 32 struct snd_soc_pcm_runtime *rtd = substream->private_data; 33 struct snd_soc_device *socdev = rtd->socdev; 34 struct snd_soc_codec *codec = socdev->card->codec; 35 36 int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? 37 AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE; 38 return snd_ac97_set_rate(codec->ac97, reg, runtime->rate); 39 } 40 41 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\ 42 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\ 43 SNDRV_PCM_RATE_48000) 44 45 static struct snd_soc_dai_ops ac97_dai_ops = { 46 .prepare = ac97_prepare, 47 }; 48 49 struct snd_soc_dai ac97_dai = { 50 .name = "AC97 HiFi", 51 .ac97_control = 1, 52 .playback = { 53 .stream_name = "AC97 Playback", 54 .channels_min = 1, 55 .channels_max = 2, 56 .rates = STD_AC97_RATES, 57 .formats = SND_SOC_STD_AC97_FMTS,}, 58 .capture = { 59 .stream_name = "AC97 Capture", 60 .channels_min = 1, 61 .channels_max = 2, 62 .rates = STD_AC97_RATES, 63 .formats = SND_SOC_STD_AC97_FMTS,}, 64 .ops = &ac97_dai_ops, 65 }; 66 EXPORT_SYMBOL_GPL(ac97_dai); 67 68 static unsigned int ac97_read(struct snd_soc_codec *codec, 69 unsigned int reg) 70 { 71 return soc_ac97_ops.read(codec->ac97, reg); 72 } 73 74 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg, 75 unsigned int val) 76 { 77 soc_ac97_ops.write(codec->ac97, reg, val); 78 return 0; 79 } 80 81 static int ac97_soc_probe(struct platform_device *pdev) 82 { 83 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 84 struct snd_soc_card *card = socdev->card; 85 struct snd_soc_codec *codec; 86 struct snd_ac97_bus *ac97_bus; 87 struct snd_ac97_template ac97_template; 88 int i; 89 int ret = 0; 90 91 printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION); 92 93 socdev->card->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL); 94 if (!socdev->card->codec) 95 return -ENOMEM; 96 codec = socdev->card->codec; 97 mutex_init(&codec->mutex); 98 99 codec->name = "AC97"; 100 codec->owner = THIS_MODULE; 101 codec->dai = &ac97_dai; 102 codec->num_dai = 1; 103 codec->write = ac97_write; 104 codec->read = ac97_read; 105 INIT_LIST_HEAD(&codec->dapm_widgets); 106 INIT_LIST_HEAD(&codec->dapm_paths); 107 108 /* register pcms */ 109 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); 110 if (ret < 0) 111 goto err; 112 113 /* add codec as bus device for standard ac97 */ 114 ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus); 115 if (ret < 0) 116 goto bus_err; 117 118 memset(&ac97_template, 0, sizeof(struct snd_ac97_template)); 119 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97); 120 if (ret < 0) 121 goto bus_err; 122 123 for (i = 0; i < card->num_links; i++) { 124 if (card->dai_link[i].codec_dai->ac97_control) { 125 snd_ac97_dev_add_pdata(codec->ac97, 126 card->dai_link[i].cpu_dai->ac97_pdata); 127 } 128 } 129 130 return 0; 131 132 bus_err: 133 snd_soc_free_pcms(socdev); 134 135 err: 136 kfree(socdev->card->codec); 137 socdev->card->codec = NULL; 138 return ret; 139 } 140 141 static int ac97_soc_remove(struct platform_device *pdev) 142 { 143 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 144 struct snd_soc_codec *codec = socdev->card->codec; 145 146 if (!codec) 147 return 0; 148 149 snd_soc_free_pcms(socdev); 150 kfree(socdev->card->codec); 151 152 return 0; 153 } 154 155 #ifdef CONFIG_PM 156 static int ac97_soc_suspend(struct platform_device *pdev, pm_message_t msg) 157 { 158 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 159 160 snd_ac97_suspend(socdev->card->codec->ac97); 161 162 return 0; 163 } 164 165 static int ac97_soc_resume(struct platform_device *pdev) 166 { 167 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 168 169 snd_ac97_resume(socdev->card->codec->ac97); 170 171 return 0; 172 } 173 #else 174 #define ac97_soc_suspend NULL 175 #define ac97_soc_resume NULL 176 #endif 177 178 struct snd_soc_codec_device soc_codec_dev_ac97 = { 179 .probe = ac97_soc_probe, 180 .remove = ac97_soc_remove, 181 .suspend = ac97_soc_suspend, 182 .resume = ac97_soc_resume, 183 }; 184 EXPORT_SYMBOL_GPL(soc_codec_dev_ac97); 185 186 MODULE_DESCRIPTION("Soc Generic AC97 driver"); 187 MODULE_AUTHOR("Liam Girdwood"); 188 MODULE_LICENSE("GPL"); 189