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
41 int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
42 AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
43 return snd_ac97_set_rate(codec->ac97, reg, substream->runtime->rate);
44}
45
46#define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
47 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
48 SNDRV_PCM_RATE_48000)
49
50static const struct snd_soc_dai_ops ac97_dai_ops = {
51 .prepare = ac97_prepare,
52};
53
54static struct snd_soc_dai_driver ac97_dai = {
55 .name = "ac97-hifi",
56 .ac97_control = 1,
57 .playback = {
58 .stream_name = "AC97 Playback",
59 .channels_min = 1,
60 .channels_max = 2,
61 .rates = STD_AC97_RATES,
62 .formats = SND_SOC_STD_AC97_FMTS,},
63 .capture = {
64 .stream_name = "AC97 Capture",
65 .channels_min = 1,
66 .channels_max = 2,
67 .rates = STD_AC97_RATES,
68 .formats = SND_SOC_STD_AC97_FMTS,},
69 .ops = &ac97_dai_ops,
70};
71
72static unsigned int ac97_read(struct snd_soc_codec *codec,
73 unsigned int reg)
74{
75 return soc_ac97_ops->read(codec->ac97, reg);
76}
77
78static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
79 unsigned int val)
80{
81 soc_ac97_ops->write(codec->ac97, reg, val);
82 return 0;
83}
84
85static int ac97_soc_probe(struct snd_soc_codec *codec)
86{
87 struct snd_ac97_bus *ac97_bus;
88 struct snd_ac97_template ac97_template;
89 int ret;
90
91 /* add codec as bus device for standard ac97 */
92 ret = snd_ac97_bus(codec->card->snd_card, 0, soc_ac97_ops, NULL,
93 &ac97_bus);
94 if (ret < 0)
95 return ret;
96
97 memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
98 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
99 if (ret < 0)
100 return ret;
101
102 return 0;
103}
104
105#ifdef CONFIG_PM
106static int ac97_soc_suspend(struct snd_soc_codec *codec)
107{
108 snd_ac97_suspend(codec->ac97);
109
110 return 0;
111}
112
113static int ac97_soc_resume(struct snd_soc_codec *codec)
114{
115 snd_ac97_resume(codec->ac97);
116
117 return 0;
118}
119#else
120#define ac97_soc_suspend NULL
121#define ac97_soc_resume NULL
122#endif
123
124static struct snd_soc_codec_driver soc_codec_dev_ac97 = {
125 .write = ac97_write,
126 .read = ac97_read,
127 .probe = ac97_soc_probe,
128 .suspend = ac97_soc_suspend,
129 .resume = ac97_soc_resume,
130
131 .dapm_widgets = ac97_widgets,
132 .num_dapm_widgets = ARRAY_SIZE(ac97_widgets),
133 .dapm_routes = ac97_routes,
134 .num_dapm_routes = ARRAY_SIZE(ac97_routes),
135};
136
137static int ac97_probe(struct platform_device *pdev)
138{
139 return snd_soc_register_codec(&pdev->dev,
140 &soc_codec_dev_ac97, &ac97_dai, 1);
141}
142
143static int ac97_remove(struct platform_device *pdev)
144{
145 snd_soc_unregister_codec(&pdev->dev);
146 return 0;
147}
148
149static struct platform_driver ac97_codec_driver = {
150 .driver = {
151 .name = "ac97-codec",
152 .owner = THIS_MODULE,
153 },
154
155 .probe = ac97_probe,
156 .remove = ac97_remove,
157};
158
159module_platform_driver(ac97_codec_driver);
160
161MODULE_DESCRIPTION("Soc Generic AC97 driver");
162MODULE_AUTHOR("Liam Girdwood");
163MODULE_LICENSE("GPL");
164MODULE_ALIAS("platform:ac97-codec");