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 const struct snd_soc_dapm_widget ac97_widgets[] = { 27 SND_SOC_DAPM_INPUT("RX"), 28 SND_SOC_DAPM_OUTPUT("TX"), 29 }; 30 31 static const struct snd_soc_dapm_route ac97_routes[] = { 32 { "AC97 Capture", NULL, "RX" }, 33 { "TX", NULL, "AC97 Playback" }, 34 }; 35 36 static int ac97_prepare(struct snd_pcm_substream *substream, 37 struct snd_soc_dai *dai) 38 { 39 struct snd_soc_codec *codec = dai->codec; 40 41 int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? 42 AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE; 43 return snd_ac97_set_rate(codec->ac97, reg, substream->runtime->rate); 44 } 45 46 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\ 47 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\ 48 SNDRV_PCM_RATE_48000) 49 50 static const struct snd_soc_dai_ops ac97_dai_ops = { 51 .prepare = ac97_prepare, 52 }; 53 54 static struct snd_soc_dai_driver ac97_dai = { 55 .name = "ac97-hifi", 56 .ac97_control = 1, 57 .playback = { 58 .stream_name = "AC97 Playback", 59 .channels_min = 1, 60 .channels_max = 2, 61 .rates = STD_AC97_RATES, 62 .formats = SND_SOC_STD_AC97_FMTS,}, 63 .capture = { 64 .stream_name = "AC97 Capture", 65 .channels_min = 1, 66 .channels_max = 2, 67 .rates = STD_AC97_RATES, 68 .formats = SND_SOC_STD_AC97_FMTS,}, 69 .ops = &ac97_dai_ops, 70 }; 71 72 static unsigned int ac97_read(struct snd_soc_codec *codec, 73 unsigned int reg) 74 { 75 return soc_ac97_ops->read(codec->ac97, reg); 76 } 77 78 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg, 79 unsigned int val) 80 { 81 soc_ac97_ops->write(codec->ac97, reg, val); 82 return 0; 83 } 84 85 static int ac97_soc_probe(struct snd_soc_codec *codec) 86 { 87 struct snd_ac97_bus *ac97_bus; 88 struct snd_ac97_template ac97_template; 89 int ret; 90 91 /* add codec as bus device for standard ac97 */ 92 ret = snd_ac97_bus(codec->card->snd_card, 0, soc_ac97_ops, NULL, 93 &ac97_bus); 94 if (ret < 0) 95 return ret; 96 97 memset(&ac97_template, 0, sizeof(struct snd_ac97_template)); 98 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97); 99 if (ret < 0) 100 return ret; 101 102 return 0; 103 } 104 105 #ifdef CONFIG_PM 106 static int ac97_soc_suspend(struct snd_soc_codec *codec) 107 { 108 snd_ac97_suspend(codec->ac97); 109 110 return 0; 111 } 112 113 static int ac97_soc_resume(struct snd_soc_codec *codec) 114 { 115 snd_ac97_resume(codec->ac97); 116 117 return 0; 118 } 119 #else 120 #define ac97_soc_suspend NULL 121 #define ac97_soc_resume NULL 122 #endif 123 124 static struct snd_soc_codec_driver soc_codec_dev_ac97 = { 125 .write = ac97_write, 126 .read = ac97_read, 127 .probe = ac97_soc_probe, 128 .suspend = ac97_soc_suspend, 129 .resume = ac97_soc_resume, 130 131 .dapm_widgets = ac97_widgets, 132 .num_dapm_widgets = ARRAY_SIZE(ac97_widgets), 133 .dapm_routes = ac97_routes, 134 .num_dapm_routes = ARRAY_SIZE(ac97_routes), 135 }; 136 137 static int ac97_probe(struct platform_device *pdev) 138 { 139 return snd_soc_register_codec(&pdev->dev, 140 &soc_codec_dev_ac97, &ac97_dai, 1); 141 } 142 143 static int ac97_remove(struct platform_device *pdev) 144 { 145 snd_soc_unregister_codec(&pdev->dev); 146 return 0; 147 } 148 149 static struct platform_driver ac97_codec_driver = { 150 .driver = { 151 .name = "ac97-codec", 152 .owner = THIS_MODULE, 153 }, 154 155 .probe = ac97_probe, 156 .remove = ac97_remove, 157 }; 158 159 module_platform_driver(ac97_codec_driver); 160 161 MODULE_DESCRIPTION("Soc Generic AC97 driver"); 162 MODULE_AUTHOR("Liam Girdwood"); 163 MODULE_LICENSE("GPL"); 164 MODULE_ALIAS("platform:ac97-codec"); 165