1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/*
* ac97.c -- ALSA Soc AC97 codec support
*
* Copyright 2005 Wolfson Microelectronics PLC.
* Author: Liam Girdwood <lrg@slimlogic.co.uk>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* Generic AC97 support.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include "ac97.h"
#define AC97_VERSION "0.6"
static int ac97_prepare(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_device *socdev = rtd->socdev;
struct snd_soc_codec *codec = socdev->codec;
int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
return snd_ac97_set_rate(codec->ac97, reg, runtime->rate);
}
#define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
SNDRV_PCM_RATE_48000)
struct snd_soc_dai ac97_dai = {
.name = "AC97 HiFi",
.type = SND_SOC_DAI_AC97,
.playback = {
.stream_name = "AC97 Playback",
.channels_min = 1,
.channels_max = 2,
.rates = STD_AC97_RATES,
.formats = SNDRV_PCM_FMTBIT_S16_LE,},
.capture = {
.stream_name = "AC97 Capture",
.channels_min = 1,
.channels_max = 2,
.rates = STD_AC97_RATES,
.formats = SNDRV_PCM_FMTBIT_S16_LE,},
.ops = {
.prepare = ac97_prepare,},
};
EXPORT_SYMBOL_GPL(ac97_dai);
static unsigned int ac97_read(struct snd_soc_codec *codec,
unsigned int reg)
{
return soc_ac97_ops.read(codec->ac97, reg);
}
static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
unsigned int val)
{
soc_ac97_ops.write(codec->ac97, reg, val);
return 0;
}
static int ac97_soc_probe(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec;
struct snd_ac97_bus *ac97_bus;
struct snd_ac97_template ac97_template;
int ret = 0;
printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);
socdev->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
if (!socdev->codec)
return -ENOMEM;
codec = socdev->codec;
mutex_init(&codec->mutex);
codec->name = "AC97";
codec->owner = THIS_MODULE;
codec->dai = &ac97_dai;
codec->num_dai = 1;
codec->write = ac97_write;
codec->read = ac97_read;
INIT_LIST_HEAD(&codec->dapm_widgets);
INIT_LIST_HEAD(&codec->dapm_paths);
/* register pcms */
ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
if (ret < 0)
goto err;
/* add codec as bus device for standard ac97 */
ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus);
if (ret < 0)
goto bus_err;
memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
if (ret < 0)
goto bus_err;
ret = snd_soc_register_card(socdev);
if (ret < 0)
goto bus_err;
return 0;
bus_err:
snd_soc_free_pcms(socdev);
err:
kfree(socdev->codec->reg_cache);
kfree(socdev->codec);
socdev->codec = NULL;
return ret;
}
static int ac97_soc_remove(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec = socdev->codec;
if (!codec)
return 0;
snd_soc_free_pcms(socdev);
kfree(socdev->codec->reg_cache);
kfree(socdev->codec);
return 0;
}
#ifdef CONFIG_PM
static int ac97_soc_suspend(struct platform_device *pdev, pm_message_t msg)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
snd_ac97_suspend(socdev->codec->ac97);
return 0;
}
static int ac97_soc_resume(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
snd_ac97_resume(socdev->codec->ac97);
return 0;
}
#else
#define ac97_soc_suspend NULL
#define ac97_soc_resume NULL
#endif
struct snd_soc_codec_device soc_codec_dev_ac97 = {
.probe = ac97_soc_probe,
.remove = ac97_soc_remove,
.suspend = ac97_soc_suspend,
.resume = ac97_soc_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);
MODULE_DESCRIPTION("Soc Generic AC97 driver");
MODULE_AUTHOR("Liam Girdwood");
MODULE_LICENSE("GPL");
|
