LXR linux/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
  22static const struct snd_soc_dapm_widget ac97_widgets[] = {
  23        SND_SOC_DAPM_INPUT("RX"),
  24        SND_SOC_DAPM_OUTPUT("TX"),
  25};
  26
  27static const struct snd_soc_dapm_route ac97_routes[] = {
  28        { "AC97 Capture", NULL, "RX" },
  29        { "TX", NULL, "AC97 Playback" },
  30};
  31
  32static 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
  43static const struct snd_soc_dai_ops ac97_dai_ops = {
  44        .prepare        = ac97_prepare,
  45};
  46
  47static 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
  64static 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
  88static 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
  97static 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
 111static 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
 125static 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
 131static int ac97_remove(struct platform_device *pdev)
 132{
 133        return 0;
 134}
 135
 136static struct platform_driver ac97_codec_driver = {
 137        .driver = {
 138                .name = "ac97-codec",
 139        },
 140
 141        .probe = ac97_probe,
 142        .remove = ac97_remove,
 143};
 144
 145module_platform_driver(ac97_codec_driver);
 146
 147MODULE_DESCRIPTION("Soc Generic AC97 driver");
 148MODULE_AUTHOR("Liam Girdwood");
 149MODULE_LICENSE("GPL");
 150MODULE_ALIAS("platform:ac97-codec");
 151