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 struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec); 41 42 int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? 43 AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE; 44 return snd_ac97_set_rate(ac97, reg, substream->runtime->rate); 45 } 46 47 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\ 48 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\ 49 SNDRV_PCM_RATE_48000) 50 51 static const struct snd_soc_dai_ops ac97_dai_ops = { 52 .prepare = ac97_prepare, 53 }; 54 55 static struct snd_soc_dai_driver ac97_dai = { 56 .name = "ac97-hifi", 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 int ac97_soc_probe(struct snd_soc_codec *codec) 73 { 74 struct snd_ac97 *ac97; 75 struct snd_ac97_bus *ac97_bus; 76 struct snd_ac97_template ac97_template; 77 int ret; 78 79 /* add codec as bus device for standard ac97 */ 80 ret = snd_ac97_bus(codec->component.card->snd_card, 0, soc_ac97_ops, 81 NULL, &ac97_bus); 82 if (ret < 0) 83 return ret; 84 85 memset(&ac97_template, 0, sizeof(struct snd_ac97_template)); 86 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97); 87 if (ret < 0) 88 return ret; 89 90 snd_soc_codec_set_drvdata(codec, ac97); 91 92 return 0; 93 } 94 95 #ifdef CONFIG_PM 96 static int ac97_soc_suspend(struct snd_soc_codec *codec) 97 { 98 struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec); 99 100 snd_ac97_suspend(ac97); 101 102 return 0; 103 } 104 105 static int ac97_soc_resume(struct snd_soc_codec *codec) 106 { 107 108 struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec); 109 110 snd_ac97_resume(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 .probe = ac97_soc_probe, 121 .suspend = ac97_soc_suspend, 122 .resume = ac97_soc_resume, 123 124 .dapm_widgets = ac97_widgets, 125 .num_dapm_widgets = ARRAY_SIZE(ac97_widgets), 126 .dapm_routes = ac97_routes, 127 .num_dapm_routes = ARRAY_SIZE(ac97_routes), 128 }; 129 130 static int ac97_probe(struct platform_device *pdev) 131 { 132 return snd_soc_register_codec(&pdev->dev, 133 &soc_codec_dev_ac97, &ac97_dai, 1); 134 } 135 136 static int ac97_remove(struct platform_device *pdev) 137 { 138 snd_soc_unregister_codec(&pdev->dev); 139 return 0; 140 } 141 142 static struct platform_driver ac97_codec_driver = { 143 .driver = { 144 .name = "ac97-codec", 145 .owner = THIS_MODULE, 146 }, 147 148 .probe = ac97_probe, 149 .remove = ac97_remove, 150 }; 151 152 module_platform_driver(ac97_codec_driver); 153 154 MODULE_DESCRIPTION("Soc Generic AC97 driver"); 155 MODULE_AUTHOR("Liam Girdwood"); 156 MODULE_LICENSE("GPL"); 157 MODULE_ALIAS("platform:ac97-codec"); 158