2 * ac97.c -- ALSA Soc AC97 codec support
4 * Copyright 2005 Wolfson Microelectronics PLC.
5 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
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.
12 * Generic AC97 support.
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>
26 static const struct snd_soc_dapm_widget ac97_widgets[] = {
27 SND_SOC_DAPM_INPUT("RX"),
28 SND_SOC_DAPM_OUTPUT("TX"),
31 static const struct snd_soc_dapm_route ac97_routes[] = {
32 { "AC97 Capture", NULL, "RX" },
33 { "TX", NULL, "AC97 Playback" },
36 static int ac97_prepare(struct snd_pcm_substream *substream,
37 struct snd_soc_dai *dai)
39 struct snd_soc_codec *codec = dai->codec;
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);
46 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
47 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
50 static const struct snd_soc_dai_ops ac97_dai_ops = {
51 .prepare = ac97_prepare,
54 static struct snd_soc_dai_driver ac97_dai = {
58 .stream_name = "AC97 Playback",
61 .rates = STD_AC97_RATES,
62 .formats = SND_SOC_STD_AC97_FMTS,},
64 .stream_name = "AC97 Capture",
67 .rates = STD_AC97_RATES,
68 .formats = SND_SOC_STD_AC97_FMTS,},
72 static int ac97_soc_probe(struct snd_soc_codec *codec)
74 struct snd_ac97_bus *ac97_bus;
75 struct snd_ac97_template ac97_template;
78 /* add codec as bus device for standard ac97 */
79 ret = snd_ac97_bus(codec->component.card->snd_card, 0, soc_ac97_ops,
84 memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
85 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
93 static int ac97_soc_suspend(struct snd_soc_codec *codec)
95 snd_ac97_suspend(codec->ac97);
100 static int ac97_soc_resume(struct snd_soc_codec *codec)
102 snd_ac97_resume(codec->ac97);
107 #define ac97_soc_suspend NULL
108 #define ac97_soc_resume NULL
111 static struct snd_soc_codec_driver soc_codec_dev_ac97 = {
112 .probe = ac97_soc_probe,
113 .suspend = ac97_soc_suspend,
114 .resume = ac97_soc_resume,
116 .dapm_widgets = ac97_widgets,
117 .num_dapm_widgets = ARRAY_SIZE(ac97_widgets),
118 .dapm_routes = ac97_routes,
119 .num_dapm_routes = ARRAY_SIZE(ac97_routes),
122 static int ac97_probe(struct platform_device *pdev)
124 return snd_soc_register_codec(&pdev->dev,
125 &soc_codec_dev_ac97, &ac97_dai, 1);
128 static int ac97_remove(struct platform_device *pdev)
130 snd_soc_unregister_codec(&pdev->dev);
134 static struct platform_driver ac97_codec_driver = {
136 .name = "ac97-codec",
137 .owner = THIS_MODULE,
141 .remove = ac97_remove,
144 module_platform_driver(ac97_codec_driver);
146 MODULE_DESCRIPTION("Soc Generic AC97 driver");
147 MODULE_AUTHOR("Liam Girdwood");
148 MODULE_LICENSE("GPL");
149 MODULE_ALIAS("platform:ac97-codec");