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 25 static int ac97_prepare(struct snd_pcm_substream *substream, 26 struct snd_soc_dai *dai) 27 { 28 struct snd_pcm_runtime *runtime = substream->runtime; 29 struct snd_soc_pcm_runtime *rtd = substream->private_data; 30 struct snd_soc_codec *codec = rtd->codec; 31 32 int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? 33 AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE; 34 return snd_ac97_set_rate(codec->ac97, reg, runtime->rate); 35 } 36 37 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\ 38 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\ 39 SNDRV_PCM_RATE_48000) 40 41 static struct snd_soc_dai_ops ac97_dai_ops = { 42 .prepare = ac97_prepare, 43 }; 44 45 static struct snd_soc_dai_driver ac97_dai = { 46 .name = "ac97-hifi", 47 .ac97_control = 1, 48 .playback = { 49 .stream_name = "AC97 Playback", 50 .channels_min = 1, 51 .channels_max = 2, 52 .rates = STD_AC97_RATES, 53 .formats = SND_SOC_STD_AC97_FMTS,}, 54 .capture = { 55 .stream_name = "AC97 Capture", 56 .channels_min = 1, 57 .channels_max = 2, 58 .rates = STD_AC97_RATES, 59 .formats = SND_SOC_STD_AC97_FMTS,}, 60 .ops = &ac97_dai_ops, 61 }; 62 63 static unsigned int ac97_read(struct snd_soc_codec *codec, 64 unsigned int reg) 65 { 66 return soc_ac97_ops.read(codec->ac97, reg); 67 } 68 69 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg, 70 unsigned int val) 71 { 72 soc_ac97_ops.write(codec->ac97, reg, val); 73 return 0; 74 } 75 76 static int ac97_soc_probe(struct snd_soc_codec *codec) 77 { 78 struct snd_ac97_bus *ac97_bus; 79 struct snd_ac97_template ac97_template; 80 int ret; 81 82 /* add codec as bus device for standard ac97 */ 83 ret = snd_ac97_bus(codec->card->snd_card, 0, &soc_ac97_ops, NULL, &ac97_bus); 84 if (ret < 0) 85 return ret; 86 87 memset(&ac97_template, 0, sizeof(struct snd_ac97_template)); 88 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97); 89 if (ret < 0) 90 return ret; 91 92 return 0; 93 } 94 95 static int ac97_soc_remove(struct snd_soc_codec *codec) 96 { 97 return 0; 98 } 99 100 #ifdef CONFIG_PM 101 static int ac97_soc_suspend(struct snd_soc_codec *codec, pm_message_t msg) 102 { 103 snd_ac97_suspend(codec->ac97); 104 105 return 0; 106 } 107 108 static int ac97_soc_resume(struct snd_soc_codec *codec) 109 { 110 snd_ac97_resume(codec->ac97); 111 112 return 0; 113 } 114 #else 115 #define ac97_soc_suspend NULL 116 #define ac97_soc_resume NULL 117 #endif 118 119 static struct snd_soc_codec_driver soc_codec_dev_ac97 = { 120 .write = ac97_write, 121 .read = ac97_read, 122 .probe = ac97_soc_probe, 123 .remove = ac97_soc_remove, 124 .suspend = ac97_soc_suspend, 125 .resume = ac97_soc_resume, 126 }; 127 128 static __devinit int ac97_probe(struct platform_device *pdev) 129 { 130 return snd_soc_register_codec(&pdev->dev, 131 &soc_codec_dev_ac97, &ac97_dai, 1); 132 } 133 134 static int __devexit ac97_remove(struct platform_device *pdev) 135 { 136 snd_soc_unregister_codec(&pdev->dev); 137 return 0; 138 } 139 140 static struct platform_driver ac97_codec_driver = { 141 .driver = { 142 .name = "ac97-codec", 143 .owner = THIS_MODULE, 144 }, 145 146 .probe = ac97_probe, 147 .remove = __devexit_p(ac97_remove), 148 }; 149 150 static int __init ac97_init(void) 151 { 152 return platform_driver_register(&ac97_codec_driver); 153 } 154 module_init(ac97_init); 155 156 static void __exit ac97_exit(void) 157 { 158 platform_driver_unregister(&ac97_codec_driver); 159 } 160 module_exit(ac97_exit); 161 162 MODULE_DESCRIPTION("Soc Generic AC97 driver"); 163 MODULE_AUTHOR("Liam Girdwood"); 164 MODULE_LICENSE("GPL"); 165