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Linux/sound/soc/codecs/ac97.c

  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 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         .dapm_widgets = ac97_widgets,
121         .num_dapm_widgets = ARRAY_SIZE(ac97_widgets),
122         .dapm_routes = ac97_routes,
123         .num_dapm_routes = ARRAY_SIZE(ac97_routes),
124 };
125 
126 static int ac97_probe(struct platform_device *pdev)
127 {
128         return snd_soc_register_codec(&pdev->dev,
129                         &soc_codec_dev_ac97, &ac97_dai, 1);
130 }
131 
132 static int ac97_remove(struct platform_device *pdev)
133 {
134         snd_soc_unregister_codec(&pdev->dev);
135         return 0;
136 }
137 
138 static struct platform_driver ac97_codec_driver = {
139         .driver = {
140                 .name = "ac97-codec",
141         },
142 
143         .probe = ac97_probe,
144         .remove = ac97_remove,
145 };
146 
147 module_platform_driver(ac97_codec_driver);
148 
149 MODULE_DESCRIPTION("Soc Generic AC97 driver");
150 MODULE_AUTHOR("Liam Girdwood");
151 MODULE_LICENSE("GPL");
152 MODULE_ALIAS("platform:ac97-codec");
153 

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