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/kernel.h>
17 #include <linux/device.h>
18 #include <sound/core.h>
19 #include <sound/pcm.h>
20 #include <sound/ac97_codec.h>
21 #include <sound/initval.h>
22 #include <sound/soc.h>
25 #define AC97_VERSION "0.6"
27 static int ac97_prepare(struct snd_pcm_substream *substream,
28 struct snd_soc_dai *dai)
30 struct snd_pcm_runtime *runtime = substream->runtime;
31 struct snd_soc_pcm_runtime *rtd = substream->private_data;
32 struct snd_soc_device *socdev = rtd->socdev;
33 struct snd_soc_codec *codec = socdev->card->codec;
35 int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
36 AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
37 return snd_ac97_set_rate(codec->ac97, reg, runtime->rate);
40 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
41 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
44 static struct snd_soc_dai_ops ac97_dai_ops = {
45 .prepare = ac97_prepare,
48 struct snd_soc_dai ac97_dai = {
52 .stream_name = "AC97 Playback",
55 .rates = STD_AC97_RATES,
56 .formats = SND_SOC_STD_AC97_FMTS,},
58 .stream_name = "AC97 Capture",
61 .rates = STD_AC97_RATES,
62 .formats = SND_SOC_STD_AC97_FMTS,},
65 EXPORT_SYMBOL_GPL(ac97_dai);
67 static unsigned int ac97_read(struct snd_soc_codec *codec,
70 return soc_ac97_ops.read(codec->ac97, reg);
73 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
76 soc_ac97_ops.write(codec->ac97, reg, val);
80 static int ac97_soc_probe(struct platform_device *pdev)
82 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
83 struct snd_soc_codec *codec;
84 struct snd_ac97_bus *ac97_bus;
85 struct snd_ac97_template ac97_template;
88 printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);
90 socdev->card->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
91 if (!socdev->card->codec)
93 codec = socdev->card->codec;
94 mutex_init(&codec->mutex);
97 codec->owner = THIS_MODULE;
98 codec->dai = &ac97_dai;
100 codec->write = ac97_write;
101 codec->read = ac97_read;
102 INIT_LIST_HEAD(&codec->dapm_widgets);
103 INIT_LIST_HEAD(&codec->dapm_paths);
106 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
110 /* add codec as bus device for standard ac97 */
111 ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus);
115 memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
116 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
120 ret = snd_soc_init_card(socdev);
126 snd_soc_free_pcms(socdev);
129 kfree(socdev->card->codec);
130 socdev->card->codec = NULL;
134 static int ac97_soc_remove(struct platform_device *pdev)
136 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
137 struct snd_soc_codec *codec = socdev->card->codec;
142 snd_soc_free_pcms(socdev);
143 kfree(socdev->card->codec);
149 static int ac97_soc_suspend(struct platform_device *pdev, pm_message_t msg)
151 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
153 snd_ac97_suspend(socdev->card->codec->ac97);
158 static int ac97_soc_resume(struct platform_device *pdev)
160 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
162 snd_ac97_resume(socdev->card->codec->ac97);
167 #define ac97_soc_suspend NULL
168 #define ac97_soc_resume NULL
171 struct snd_soc_codec_device soc_codec_dev_ac97 = {
172 .probe = ac97_soc_probe,
173 .remove = ac97_soc_remove,
174 .suspend = ac97_soc_suspend,
175 .resume = ac97_soc_resume,
177 EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);
179 MODULE_DESCRIPTION("Soc Generic AC97 driver");
180 MODULE_AUTHOR("Liam Girdwood");
181 MODULE_LICENSE("GPL");