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/driver.h>
23 #include <sound/core.h>
24 #include <sound/pcm.h>
25 #include <sound/ac97_codec.h>
26 #include <sound/initval.h>
27 #include <sound/soc.h>
29 #define AC97_VERSION "0.6"
31 static int ac97_prepare(struct snd_pcm_substream *substream)
33 struct snd_pcm_runtime *runtime = substream->runtime;
34 struct snd_soc_pcm_runtime *rtd = substream->private_data;
35 struct snd_soc_device *socdev = rtd->socdev;
36 struct snd_soc_codec *codec = socdev->codec;
38 int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
39 AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
40 return snd_ac97_set_rate(codec->ac97, reg, runtime->rate);
43 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
44 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000)
46 static struct snd_soc_codec_dai ac97_dai = {
49 .stream_name = "AC97 Playback",
52 .rates = STD_AC97_RATES,
53 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
55 .stream_name = "AC97 Capture",
58 .rates = STD_AC97_RATES,
59 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
61 .prepare = ac97_prepare,},
64 static unsigned int ac97_read(struct snd_soc_codec *codec,
67 return soc_ac97_ops.read(codec->ac97, reg);
70 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
73 soc_ac97_ops.write(codec->ac97, reg, val);
77 static int ac97_soc_probe(struct platform_device *pdev)
79 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
80 struct snd_soc_codec *codec;
81 struct snd_ac97_bus *ac97_bus;
82 struct snd_ac97_template ac97_template;
85 printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);
87 socdev->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
88 if (socdev->codec == NULL)
90 codec = socdev->codec;
91 mutex_init(&codec->mutex);
94 codec->owner = THIS_MODULE;
95 codec->dai = &ac97_dai;
97 codec->write = ac97_write;
98 codec->read = ac97_read;
99 INIT_LIST_HEAD(&codec->dapm_widgets);
100 INIT_LIST_HEAD(&codec->dapm_paths);
103 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
107 /* add codec as bus device for standard ac97 */
108 ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus);
112 memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
113 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
117 ret = snd_soc_register_card(socdev);
123 snd_soc_free_pcms(socdev);
126 kfree(socdev->codec->reg_cache);
127 kfree(socdev->codec);
128 socdev->codec = NULL;
132 static int ac97_soc_remove(struct platform_device *pdev)
134 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
135 struct snd_soc_codec *codec = socdev->codec;
140 snd_soc_free_pcms(socdev);
141 kfree(socdev->codec->reg_cache);
142 kfree(socdev->codec);
147 struct snd_soc_codec_device soc_codec_dev_ac97= {
148 .probe = ac97_soc_probe,
149 .remove = ac97_soc_remove,
152 EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);
154 MODULE_DESCRIPTION("Soc Generic AC97 driver");
155 MODULE_AUTHOR("Liam Girdwood");
156 MODULE_LICENSE("GPL");