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Linux/sound/soc/codecs/ac97.c

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  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         .non_legacy_dai_naming  = 1,
123 };
124 
125 static int ac97_probe(struct platform_device *pdev)
126 {
127         return devm_snd_soc_register_component(&pdev->dev,
128                         &soc_component_dev_ac97, &ac97_dai, 1);
129 }
130 
131 static int ac97_remove(struct platform_device *pdev)
132 {
133         return 0;
134 }
135 
136 static struct platform_driver ac97_codec_driver = {
137         .driver = {
138                 .name = "ac97-codec",
139         },
140 
141         .probe = ac97_probe,
142         .remove = ac97_remove,
143 };
144 
145 module_platform_driver(ac97_codec_driver);
146 
147 MODULE_DESCRIPTION("Soc Generic AC97 driver");
148 MODULE_AUTHOR("Liam Girdwood");
149 MODULE_LICENSE("GPL");
150 MODULE_ALIAS("platform:ac97-codec");
151 

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