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 static const struct snd_soc_dai_ops ac97_dai_ops = { 48 .prepare = ac97_prepare, 49 }; 50 51 static struct snd_soc_dai_driver ac97_dai = { 52 .name = "ac97-hifi", 53 .playback = { 54 .stream_name = "AC97 Playback", 55 .channels_min = 1, 56 .channels_max = 2, 57 .rates = SNDRV_PCM_RATE_KNOT, 58 .formats = SND_SOC_STD_AC97_FMTS,}, 59 .capture = { 60 .stream_name = "AC97 Capture", 61 .channels_min = 1, 62 .channels_max = 2, 63 .rates = SNDRV_PCM_RATE_KNOT, 64 .formats = SND_SOC_STD_AC97_FMTS,}, 65 .ops = &ac97_dai_ops, 66 }; 67 68 static int ac97_soc_probe(struct snd_soc_codec *codec) 69 { 70 struct snd_ac97 *ac97; 71 struct snd_ac97_bus *ac97_bus; 72 struct snd_ac97_template ac97_template; 73 int ret; 74 75 /* add codec as bus device for standard ac97 */ 76 ret = snd_ac97_bus(codec->component.card->snd_card, 0, soc_ac97_ops, 77 NULL, &ac97_bus); 78 if (ret < 0) 79 return ret; 80 81 memset(&ac97_template, 0, sizeof(struct snd_ac97_template)); 82 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97); 83 if (ret < 0) 84 return ret; 85 86 snd_soc_codec_set_drvdata(codec, ac97); 87 88 return 0; 89 } 90 91 #ifdef CONFIG_PM 92 static int ac97_soc_suspend(struct snd_soc_codec *codec) 93 { 94 struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec); 95 96 snd_ac97_suspend(ac97); 97 98 return 0; 99 } 100 101 static int ac97_soc_resume(struct snd_soc_codec *codec) 102 { 103 104 struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec); 105 106 snd_ac97_resume(ac97); 107 108 return 0; 109 } 110 #else 111 #define ac97_soc_suspend NULL 112 #define ac97_soc_resume NULL 113 #endif 114 115 static const struct snd_soc_codec_driver soc_codec_dev_ac97 = { 116 .probe = ac97_soc_probe, 117 .suspend = ac97_soc_suspend, 118 .resume = ac97_soc_resume, 119 120 .component_driver = { 121 .dapm_widgets = ac97_widgets, 122 .num_dapm_widgets = ARRAY_SIZE(ac97_widgets), 123 .dapm_routes = ac97_routes, 124 .num_dapm_routes = ARRAY_SIZE(ac97_routes), 125 }, 126 }; 127 128 static 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 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 }, 144 145 .probe = ac97_probe, 146 .remove = ac97_remove, 147 }; 148 149 module_platform_driver(ac97_codec_driver); 150 151 MODULE_DESCRIPTION("Soc Generic AC97 driver"); 152 MODULE_AUTHOR("Liam Girdwood"); 153 MODULE_LICENSE("GPL"); 154 MODULE_ALIAS("platform:ac97-codec"); 155