2 * ac97.c -- ALSA Soc AC97 codec support
4 * Copyright 2005 Wolfson Microelectronics PLC.
5 * Author: Liam Girdwood
6 * liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
14 * 17th Oct 2005 Initial version.
16 * Generic AC97 support.
19 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/device.h>
22 #include <sound/core.h>
23 #include <sound/pcm.h>
24 #include <sound/ac97_codec.h>
25 #include <sound/initval.h>
26 #include <sound/soc.h>
28 #define AC97_VERSION "0.6"
30 static int ac97_prepare(struct snd_pcm_substream *substream)
32 struct snd_pcm_runtime *runtime = substream->runtime;
33 struct snd_soc_pcm_runtime *rtd = substream->private_data;
34 struct snd_soc_device *socdev = rtd->socdev;
35 struct snd_soc_codec *codec = socdev->codec;
37 int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
38 AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
39 return snd_ac97_set_rate(codec->ac97, reg, runtime->rate);
42 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
43 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
46 struct snd_soc_codec_dai ac97_dai = {
48 .type = SND_SOC_DAI_AC97,
50 .stream_name = "AC97 Playback",
53 .rates = STD_AC97_RATES,
54 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
56 .stream_name = "AC97 Capture",
59 .rates = STD_AC97_RATES,
60 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
62 .prepare = ac97_prepare,},
64 EXPORT_SYMBOL_GPL(ac97_dai);
66 static unsigned int ac97_read(struct snd_soc_codec *codec,
69 return soc_ac97_ops.read(codec->ac97, reg);
72 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
75 soc_ac97_ops.write(codec->ac97, reg, val);
79 static int ac97_soc_probe(struct platform_device *pdev)
81 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
82 struct snd_soc_codec *codec;
83 struct snd_ac97_bus *ac97_bus;
84 struct snd_ac97_template ac97_template;
87 printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);
89 socdev->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
92 codec = socdev->codec;
93 mutex_init(&codec->mutex);
96 codec->owner = THIS_MODULE;
97 codec->dai = &ac97_dai;
99 codec->write = ac97_write;
100 codec->read = ac97_read;
101 INIT_LIST_HEAD(&codec->dapm_widgets);
102 INIT_LIST_HEAD(&codec->dapm_paths);
105 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
109 /* add codec as bus device for standard ac97 */
110 ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus);
114 memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
115 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
119 ret = snd_soc_register_card(socdev);
125 snd_soc_free_pcms(socdev);
128 kfree(socdev->codec->reg_cache);
129 kfree(socdev->codec);
130 socdev->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->codec;
142 snd_soc_free_pcms(socdev);
143 kfree(socdev->codec->reg_cache);
144 kfree(socdev->codec);
149 struct snd_soc_codec_device soc_codec_dev_ac97 = {
150 .probe = ac97_soc_probe,
151 .remove = ac97_soc_remove,
153 EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);
155 MODULE_DESCRIPTION("Soc Generic AC97 driver");
156 MODULE_AUTHOR("Liam Girdwood");
157 MODULE_LICENSE("GPL");