sound/soc/codecs/ac97.c

   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");