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->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 struct snd_soc_dai ac97_dai = {
48 .stream_name = "AC97 Playback",
51 .rates = STD_AC97_RATES,
52 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
54 .stream_name = "AC97 Capture",
57 .rates = STD_AC97_RATES,
58 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
60 .prepare = ac97_prepare,},
62 EXPORT_SYMBOL_GPL(ac97_dai);
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);
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_init_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);
148 static int ac97_soc_suspend(struct platform_device *pdev, pm_message_t msg)
150 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
152 snd_ac97_suspend(socdev->codec->ac97);
157 static int ac97_soc_resume(struct platform_device *pdev)
159 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
161 snd_ac97_resume(socdev->codec->ac97);
166 #define ac97_soc_suspend NULL
167 #define ac97_soc_resume NULL
170 struct snd_soc_codec_device soc_codec_dev_ac97 = {
171 .probe = ac97_soc_probe,
172 .remove = ac97_soc_remove,
173 .suspend = ac97_soc_suspend,
174 .resume = ac97_soc_resume,
176 EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);
178 MODULE_DESCRIPTION("Soc Generic AC97 driver");
179 MODULE_AUTHOR("Liam Girdwood");
180 MODULE_LICENSE("GPL");