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 <linux/module.h> 20 #include <sound/core.h> 21 #include <sound/pcm.h> 22 #include <sound/ac97_codec.h> 23 #include <sound/initval.h> 24 #include <sound/soc.h> 25 26 static int ac97_prepare(struct snd_pcm_substream *substream, 27 struct snd_soc_dai *dai) 28 { 29 struct snd_soc_codec *codec = dai->codec; 30 31 int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? 32 AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE; 33 return snd_ac97_set_rate(codec->ac97, reg, substream->runtime->rate); 34 } 35 36 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\ 37 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\ 38 SNDRV_PCM_RATE_48000) 39 40 static const struct snd_soc_dai_ops ac97_dai_ops = { 41 .prepare = ac97_prepare, 42 }; 43 44 static struct snd_soc_dai_driver ac97_dai = { 45 .name = "ac97-hifi", 46 .ac97_control = 1, 47 .playback = { 48 .stream_name = "AC97 Playback", 49 .channels_min = 1, 50 .channels_max = 2, 51 .rates = STD_AC97_RATES, 52 .formats = SND_SOC_STD_AC97_FMTS,}, 53 .capture = { 54 .stream_name = "AC97 Capture", 55 .channels_min = 1, 56 .channels_max = 2, 57 .rates = STD_AC97_RATES, 58 .formats = SND_SOC_STD_AC97_FMTS,}, 59 .ops = &ac97_dai_ops, 60 }; 61 62 static unsigned int ac97_read(struct snd_soc_codec *codec, 63 unsigned int reg) 64 { 65 return soc_ac97_ops.read(codec->ac97, reg); 66 } 67 68 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg, 69 unsigned int val) 70 { 71 soc_ac97_ops.write(codec->ac97, reg, val); 72 return 0; 73 } 74 75 static int ac97_soc_probe(struct snd_soc_codec *codec) 76 { 77 struct snd_ac97_bus *ac97_bus; 78 struct snd_ac97_template ac97_template; 79 int ret; 80 81 /* add codec as bus device for standard ac97 */ 82 ret = snd_ac97_bus(codec->card->snd_card, 0, &soc_ac97_ops, NULL, &ac97_bus); 83 if (ret < 0) 84 return ret; 85 86 memset(&ac97_template, 0, sizeof(struct snd_ac97_template)); 87 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97); 88 if (ret < 0) 89 return ret; 90 91 return 0; 92 } 93 94 #ifdef CONFIG_PM 95 static int ac97_soc_suspend(struct snd_soc_codec *codec) 96 { 97 snd_ac97_suspend(codec->ac97); 98 99 return 0; 100 } 101 102 static int ac97_soc_resume(struct snd_soc_codec *codec) 103 { 104 snd_ac97_resume(codec->ac97); 105 106 return 0; 107 } 108 #else 109 #define ac97_soc_suspend NULL 110 #define ac97_soc_resume NULL 111 #endif 112 113 static struct snd_soc_codec_driver soc_codec_dev_ac97 = { 114 .write = ac97_write, 115 .read = ac97_read, 116 .probe = ac97_soc_probe, 117 .suspend = ac97_soc_suspend, 118 .resume = ac97_soc_resume, 119 }; 120 121 static __devinit int ac97_probe(struct platform_device *pdev) 122 { 123 return snd_soc_register_codec(&pdev->dev, 124 &soc_codec_dev_ac97, &ac97_dai, 1); 125 } 126 127 static int __devexit ac97_remove(struct platform_device *pdev) 128 { 129 snd_soc_unregister_codec(&pdev->dev); 130 return 0; 131 } 132 133 static struct platform_driver ac97_codec_driver = { 134 .driver = { 135 .name = "ac97-codec", 136 .owner = THIS_MODULE, 137 }, 138 139 .probe = ac97_probe, 140 .remove = __devexit_p(ac97_remove), 141 }; 142 143 module_platform_driver(ac97_codec_driver); 144 145 MODULE_DESCRIPTION("Soc Generic AC97 driver"); 146 MODULE_AUTHOR("Liam Girdwood"); 147 MODULE_LICENSE("GPL"); 148 MODULE_ALIAS("platform:ac97-codec"); 149