1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * ac97.c -- ALSA Soc AC97 codec support
4 *
5 * Copyright 2005 Wolfson Microelectronics PLC.
6 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
7 *
8 * Generic AC97 support.
9 */
10
11#include <linux/init.h>
12#include <linux/slab.h>
13#include <linux/kernel.h>
14#include <linux/device.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <sound/core.h>
18#include <sound/pcm.h>
19#include <sound/ac97_codec.h>
20#include <sound/initval.h>
21#include <sound/soc.h>
22
23static const struct snd_soc_dapm_widget ac97_widgets[] = {
24 SND_SOC_DAPM_INPUT("RX"),
25 SND_SOC_DAPM_OUTPUT("TX"),
26};
27
28static const struct snd_soc_dapm_route ac97_routes[] = {
29 { "AC97 Capture", NULL, "RX" },
30 { "TX", NULL, "AC97 Playback" },
31};
32
33static int ac97_prepare(struct snd_pcm_substream *substream,
34 struct snd_soc_dai *dai)
35{
36 struct snd_soc_component *component = dai->component;
37 struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(c: component);
38
39 int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
40 AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
41 return snd_ac97_set_rate(ac97, reg, rate: substream->runtime->rate);
42}
43
44static const struct snd_soc_dai_ops ac97_dai_ops = {
45 .prepare = ac97_prepare,
46};
47
48static struct snd_soc_dai_driver ac97_dai = {
49 .name = "ac97-hifi",
50 .playback = {
51 .stream_name = "AC97 Playback",
52 .channels_min = 1,
53 .channels_max = 2,
54 .rates = SNDRV_PCM_RATE_KNOT,
55 .formats = SND_SOC_STD_AC97_FMTS,},
56 .capture = {
57 .stream_name = "AC97 Capture",
58 .channels_min = 1,
59 .channels_max = 2,
60 .rates = SNDRV_PCM_RATE_KNOT,
61 .formats = SND_SOC_STD_AC97_FMTS,},
62 .ops = &ac97_dai_ops,
63};
64
65static int ac97_soc_probe(struct snd_soc_component *component)
66{
67 struct snd_ac97 *ac97;
68 struct snd_ac97_bus *ac97_bus;
69 struct snd_ac97_template ac97_template;
70 int ret;
71
72 /* add codec as bus device for standard ac97 */
73 ret = snd_ac97_bus(card: component->card->snd_card, num: 0, ops: soc_ac97_ops,
74 NULL, rbus: &ac97_bus);
75 if (ret < 0)
76 return ret;
77
78 memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
79 ret = snd_ac97_mixer(bus: ac97_bus, template: &ac97_template, rac97: &ac97);
80 if (ret < 0)
81 return ret;
82
83 snd_soc_component_set_drvdata(c: component, data: ac97);
84
85 return 0;
86}
87
88#ifdef CONFIG_PM
89static int ac97_soc_suspend(struct snd_soc_component *component)
90{
91 struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(c: component);
92
93 snd_ac97_suspend(ac97);
94
95 return 0;
96}
97
98static int ac97_soc_resume(struct snd_soc_component *component)
99{
100
101 struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(c: component);
102
103 snd_ac97_resume(ac97);
104
105 return 0;
106}
107#else
108#define ac97_soc_suspend NULL
109#define ac97_soc_resume NULL
110#endif
111
112static const struct snd_soc_component_driver soc_component_dev_ac97 = {
113 .probe = ac97_soc_probe,
114 .suspend = ac97_soc_suspend,
115 .resume = ac97_soc_resume,
116 .dapm_widgets = ac97_widgets,
117 .num_dapm_widgets = ARRAY_SIZE(ac97_widgets),
118 .dapm_routes = ac97_routes,
119 .num_dapm_routes = ARRAY_SIZE(ac97_routes),
120 .idle_bias_on = 1,
121 .use_pmdown_time = 1,
122 .endianness = 1,
123};
124
125static int ac97_probe(struct platform_device *pdev)
126{
127 return devm_snd_soc_register_component(dev: &pdev->dev,
128 component_driver: &soc_component_dev_ac97, dai_drv: &ac97_dai, num_dai: 1);
129}
130
131#ifdef CONFIG_OF
132static const struct of_device_id ac97_codec_of_match[] = {
133 { .compatible = "realtek,alc203", },
134 { }
135};
136MODULE_DEVICE_TABLE(of, ac97_codec_of_match);
137#endif
138
139static struct platform_driver ac97_codec_driver = {
140 .driver = {
141 .name = "ac97-codec",
142 .of_match_table = of_match_ptr(ac97_codec_of_match),
143 },
144
145 .probe = ac97_probe,
146};
147
148module_platform_driver(ac97_codec_driver);
149
150MODULE_DESCRIPTION("Soc Generic AC97 driver");
151MODULE_AUTHOR("Liam Girdwood");
152MODULE_LICENSE("GPL");
153MODULE_ALIAS("platform:ac97-codec");
154

source code of linux/sound/soc/codecs/ac97.c