150 lines
3.5 KiB
C
150 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* ac97.c -- ALSA Soc AC97 codec support
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*
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* Copyright 2005 Wolfson Microelectronics PLC.
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* Author: Liam Girdwood <lrg@slimlogic.co.uk>
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*
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* Generic AC97 support.
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*/
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/ac97_codec.h>
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#include <sound/initval.h>
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#include <sound/soc.h>
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static const struct snd_soc_dapm_widget ac97_widgets[] = {
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SND_SOC_DAPM_INPUT("RX"),
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SND_SOC_DAPM_OUTPUT("TX"),
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};
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static const struct snd_soc_dapm_route ac97_routes[] = {
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{ "AC97 Capture", NULL, "RX" },
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{ "TX", NULL, "AC97 Playback" },
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};
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static int ac97_prepare(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai)
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{
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struct snd_soc_component *component = dai->component;
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struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(component);
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int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
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AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
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return snd_ac97_set_rate(ac97, reg, substream->runtime->rate);
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}
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static const struct snd_soc_dai_ops ac97_dai_ops = {
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.prepare = ac97_prepare,
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};
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static struct snd_soc_dai_driver ac97_dai = {
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.name = "ac97-hifi",
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.playback = {
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.stream_name = "AC97 Playback",
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.channels_min = 1,
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.channels_max = 2,
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.rates = SNDRV_PCM_RATE_KNOT,
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.formats = SND_SOC_STD_AC97_FMTS,},
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.capture = {
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.stream_name = "AC97 Capture",
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.channels_min = 1,
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.channels_max = 2,
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.rates = SNDRV_PCM_RATE_KNOT,
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.formats = SND_SOC_STD_AC97_FMTS,},
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.ops = &ac97_dai_ops,
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};
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static int ac97_soc_probe(struct snd_soc_component *component)
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{
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struct snd_ac97 *ac97;
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struct snd_ac97_bus *ac97_bus;
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struct snd_ac97_template ac97_template;
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int ret;
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/* add codec as bus device for standard ac97 */
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ret = snd_ac97_bus(component->card->snd_card, 0, soc_ac97_ops,
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NULL, &ac97_bus);
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if (ret < 0)
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return ret;
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memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
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ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97);
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if (ret < 0)
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return ret;
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snd_soc_component_set_drvdata(component, ac97);
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return 0;
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}
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#ifdef CONFIG_PM
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static int ac97_soc_suspend(struct snd_soc_component *component)
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{
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struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(component);
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snd_ac97_suspend(ac97);
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return 0;
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}
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static int ac97_soc_resume(struct snd_soc_component *component)
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{
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struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(component);
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snd_ac97_resume(ac97);
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return 0;
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}
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#else
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#define ac97_soc_suspend NULL
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#define ac97_soc_resume NULL
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#endif
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static const struct snd_soc_component_driver soc_component_dev_ac97 = {
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.probe = ac97_soc_probe,
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.suspend = ac97_soc_suspend,
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.resume = ac97_soc_resume,
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.dapm_widgets = ac97_widgets,
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.num_dapm_widgets = ARRAY_SIZE(ac97_widgets),
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.dapm_routes = ac97_routes,
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.num_dapm_routes = ARRAY_SIZE(ac97_routes),
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.idle_bias_on = 1,
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.use_pmdown_time = 1,
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.endianness = 1,
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};
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static int ac97_probe(struct platform_device *pdev)
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{
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return devm_snd_soc_register_component(&pdev->dev,
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&soc_component_dev_ac97, &ac97_dai, 1);
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}
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static int ac97_remove(struct platform_device *pdev)
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{
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return 0;
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}
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static struct platform_driver ac97_codec_driver = {
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.driver = {
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.name = "ac97-codec",
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},
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.probe = ac97_probe,
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.remove = ac97_remove,
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};
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module_platform_driver(ac97_codec_driver);
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MODULE_DESCRIPTION("Soc Generic AC97 driver");
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MODULE_AUTHOR("Liam Girdwood");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:ac97-codec");
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