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Linux/sound/soc/codecs/ac97.c

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  1 /*
  2  * ac97.c  --  ALSA Soc AC97 codec support
  3  *
  4  * Copyright 2005 Wolfson Microelectronics PLC.
  5  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
  6  *
  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.
 11  *
 12  * Generic AC97 support.
 13  */
 14 
 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>
 23 #include "ac97.h"
 24 
 25 #define AC97_VERSION "0.6"
 26 
 27 static int ac97_prepare(struct snd_pcm_substream *substream,
 28                         struct snd_soc_dai *dai)
 29 {
 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;
 34 
 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);
 38 }
 39 
 40 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
 41                 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
 42                 SNDRV_PCM_RATE_48000)
 43 
 44 static struct snd_soc_dai_ops ac97_dai_ops = {
 45         .prepare        = ac97_prepare,
 46 };
 47 
 48 struct snd_soc_dai ac97_dai = {
 49         .name = "AC97 HiFi",
 50         .ac97_control = 1,
 51         .playback = {
 52                 .stream_name = "AC97 Playback",
 53                 .channels_min = 1,
 54                 .channels_max = 2,
 55                 .rates = STD_AC97_RATES,
 56                 .formats = SND_SOC_STD_AC97_FMTS,},
 57         .capture = {
 58                 .stream_name = "AC97 Capture",
 59                 .channels_min = 1,
 60                 .channels_max = 2,
 61                 .rates = STD_AC97_RATES,
 62                 .formats = SND_SOC_STD_AC97_FMTS,},
 63         .ops = &ac97_dai_ops,
 64 };
 65 EXPORT_SYMBOL_GPL(ac97_dai);
 66 
 67 static unsigned int ac97_read(struct snd_soc_codec *codec,
 68         unsigned int reg)
 69 {
 70         return soc_ac97_ops.read(codec->ac97, reg);
 71 }
 72 
 73 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
 74         unsigned int val)
 75 {
 76         soc_ac97_ops.write(codec->ac97, reg, val);
 77         return 0;
 78 }
 79 
 80 static int ac97_soc_probe(struct platform_device *pdev)
 81 {
 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;
 86         int ret = 0;
 87 
 88         printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);
 89 
 90         socdev->card->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
 91         if (!socdev->card->codec)
 92                 return -ENOMEM;
 93         codec = socdev->card->codec;
 94         mutex_init(&codec->mutex);
 95 
 96         codec->name = "AC97";
 97         codec->owner = THIS_MODULE;
 98         codec->dai = &ac97_dai;
 99         codec->num_dai = 1;
100         codec->write = ac97_write;
101         codec->read = ac97_read;
102         INIT_LIST_HEAD(&codec->dapm_widgets);
103         INIT_LIST_HEAD(&codec->dapm_paths);
104 
105         /* register pcms */
106         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
107         if (ret < 0)
108                 goto err;
109 
110         /* add codec as bus device for standard ac97 */
111         ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus);
112         if (ret < 0)
113                 goto bus_err;
114 
115         memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
116         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
117         if (ret < 0)
118                 goto bus_err;
119 
120         ret = snd_soc_init_card(socdev);
121         if (ret < 0)
122                 goto bus_err;
123         return 0;
124 
125 bus_err:
126         snd_soc_free_pcms(socdev);
127 
128 err:
129         kfree(socdev->card->codec);
130         socdev->card->codec = NULL;
131         return ret;
132 }
133 
134 static int ac97_soc_remove(struct platform_device *pdev)
135 {
136         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
137         struct snd_soc_codec *codec = socdev->card->codec;
138 
139         if (!codec)
140                 return 0;
141 
142         snd_soc_free_pcms(socdev);
143         kfree(socdev->card->codec);
144 
145         return 0;
146 }
147 
148 #ifdef CONFIG_PM
149 static int ac97_soc_suspend(struct platform_device *pdev, pm_message_t msg)
150 {
151         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
152 
153         snd_ac97_suspend(socdev->card->codec->ac97);
154 
155         return 0;
156 }
157 
158 static int ac97_soc_resume(struct platform_device *pdev)
159 {
160         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
161 
162         snd_ac97_resume(socdev->card->codec->ac97);
163 
164         return 0;
165 }
166 #else
167 #define ac97_soc_suspend NULL
168 #define ac97_soc_resume NULL
169 #endif
170 
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,
176 };
177 EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);
178 
179 MODULE_DESCRIPTION("Soc Generic AC97 driver");
180 MODULE_AUTHOR("Liam Girdwood");
181 MODULE_LICENSE("GPL");
182 

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