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)
29 struct snd_pcm_runtime *runtime = substream->runtime;
30 struct snd_soc_pcm_runtime *rtd = substream->private_data;
31 struct snd_soc_device *socdev = rtd->socdev;
32 struct snd_soc_codec *codec = socdev->codec;
34 int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
35 AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
36 return snd_ac97_set_rate(codec->ac97, reg, runtime->rate);
39 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
40 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
43 struct snd_soc_dai ac97_dai = {
45 .type = SND_SOC_DAI_AC97,
47 .stream_name = "AC97 Playback",
50 .rates = STD_AC97_RATES,
51 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
53 .stream_name = "AC97 Capture",
56 .rates = STD_AC97_RATES,
57 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
59 .prepare = ac97_prepare,},
61 EXPORT_SYMBOL_GPL(ac97_dai);
63 static unsigned int ac97_read(struct snd_soc_codec *codec,
66 return soc_ac97_ops.read(codec->ac97, reg);
69 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
72 soc_ac97_ops.write(codec->ac97, reg, val);
76 static int ac97_soc_probe(struct platform_device *pdev)
78 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
79 struct snd_soc_codec *codec;
80 struct snd_ac97_bus *ac97_bus;
81 struct snd_ac97_template ac97_template;
84 printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);
86 socdev->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
89 codec = socdev->codec;
90 mutex_init(&codec->mutex);
93 codec->owner = THIS_MODULE;
94 codec->dai = &ac97_dai;
96 codec->write = ac97_write;
97 codec->read = ac97_read;
98 INIT_LIST_HEAD(&codec->dapm_widgets);
99 INIT_LIST_HEAD(&codec->dapm_paths);
102 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
106 /* add codec as bus device for standard ac97 */
107 ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus);
111 memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
112 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
116 ret = snd_soc_register_card(socdev);
122 snd_soc_free_pcms(socdev);
125 kfree(socdev->codec->reg_cache);
126 kfree(socdev->codec);
127 socdev->codec = NULL;
131 static int ac97_soc_remove(struct platform_device *pdev)
133 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
134 struct snd_soc_codec *codec = socdev->codec;
139 snd_soc_free_pcms(socdev);
140 kfree(socdev->codec->reg_cache);
141 kfree(socdev->codec);
147 static int ac97_soc_suspend(struct platform_device *pdev, pm_message_t msg)
149 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
151 snd_ac97_suspend(socdev->codec->ac97);
156 static int ac97_soc_resume(struct platform_device *pdev)
158 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
160 snd_ac97_resume(socdev->codec->ac97);
165 #define ac97_soc_suspend NULL
166 #define ac97_soc_resume NULL
169 struct snd_soc_codec_device soc_codec_dev_ac97 = {
170 .probe = ac97_soc_probe,
171 .remove = ac97_soc_remove,
172 .suspend = ac97_soc_suspend,
173 .resume = ac97_soc_resume,
175 EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);
177 MODULE_DESCRIPTION("Soc Generic AC97 driver");
178 MODULE_AUTHOR("Liam Girdwood");
179 MODULE_LICENSE("GPL");