tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/slab.h>
17#include <linux/kernel.h>
18#include <linux/device.h>
19#include <linux/module.h>
20#include <sound/core.h>
21#include <sound/pcm.h>
22#include <sound/ac97_codec.h>
23#include <sound/initval.h>
24#include <sound/soc.h>
25
26static const struct snd_soc_dapm_widget ac97_widgets[] = {
27 SND_SOC_DAPM_INPUT("RX"),
28 SND_SOC_DAPM_OUTPUT("TX"),
29};
30
31static const struct snd_soc_dapm_route ac97_routes[] = {
32 { "AC97 Capture", NULL, "RX" },
33 { "TX", NULL, "AC97 Playback" },
34};
35
36static int ac97_prepare(struct snd_pcm_substream *substream,
37 struct snd_soc_dai *dai)
38{
39 struct snd_soc_codec *codec = dai->codec;
40 struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec);
41
42 int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
43 AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
44 return snd_ac97_set_rate(ac97, reg, substream->runtime->rate);
45}
46
47static const struct snd_soc_dai_ops ac97_dai_ops = {
48 .prepare = ac97_prepare,
49};
50
51static struct snd_soc_dai_driver ac97_dai = {
52 .name = "ac97-hifi",
53 .playback = {
54 .stream_name = "AC97 Playback",
55 .channels_min = 1,
56 .channels_max = 2,
57 .rates = SNDRV_PCM_RATE_KNOT,
58 .formats = SND_SOC_STD_AC97_FMTS,},
59 .capture = {
60 .stream_name = "AC97 Capture",
61 .channels_min = 1,
62 .channels_max = 2,
63 .rates = SNDRV_PCM_RATE_KNOT,
64 .formats = SND_SOC_STD_AC97_FMTS,},
65 .ops = &ac97_dai_ops,
66};
67
68static int ac97_soc_probe(struct snd_soc_codec *codec)
69{
70 struct snd_ac97 *ac97;
71 struct snd_ac97_bus *ac97_bus;
72 struct snd_ac97_template ac97_template;
73 int ret;
74
75 /* add codec as bus device for standard ac97 */
76 ret = snd_ac97_bus(codec->component.card->snd_card, 0, soc_ac97_ops,
77 NULL, &ac97_bus);
78 if (ret < 0)
79 return ret;
80
81 memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
82 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97);
83 if (ret < 0)
84 return ret;
85
86 snd_soc_codec_set_drvdata(codec, ac97);
87
88 return 0;
89}
90
91#ifdef CONFIG_PM
92static int ac97_soc_suspend(struct snd_soc_codec *codec)
93{
94 struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec);
95
96 snd_ac97_suspend(ac97);
97
98 return 0;
99}
100
101static int ac97_soc_resume(struct snd_soc_codec *codec)
102{
103
104 struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec);
105
106 snd_ac97_resume(ac97);
107
108 return 0;
109}
110#else
111#define ac97_soc_suspend NULL
112#define ac97_soc_resume NULL
113#endif
114
115static struct snd_soc_codec_driver soc_codec_dev_ac97 = {
116 .probe = ac97_soc_probe,
117 .suspend = ac97_soc_suspend,
118 .resume = ac97_soc_resume,
119
120 .dapm_widgets = ac97_widgets,
121 .num_dapm_widgets = ARRAY_SIZE(ac97_widgets),
122 .dapm_routes = ac97_routes,
123 .num_dapm_routes = ARRAY_SIZE(ac97_routes),
124};
125
126static int ac97_probe(struct platform_device *pdev)
127{
128 return snd_soc_register_codec(&pdev->dev,
129 &soc_codec_dev_ac97, &ac97_dai, 1);
130}
131
132static int ac97_remove(struct platform_device *pdev)
133{
134 snd_soc_unregister_codec(&pdev->dev);
135 return 0;
136}
137
138static struct platform_driver ac97_codec_driver = {
139 .driver = {
140 .name = "ac97-codec",
141 },
142
143 .probe = ac97_probe,
144 .remove = ac97_remove,
145};
146
147module_platform_driver(ac97_codec_driver);
148
149MODULE_DESCRIPTION("Soc Generic AC97 driver");
150MODULE_AUTHOR("Liam Girdwood");
151MODULE_LICENSE("GPL");
152MODULE_ALIAS("platform:ac97-codec");