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