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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 
 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 

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