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