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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * ac97.c -- ALSA Soc AC97 codec support4 *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_PM88static 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#else107#define ac97_soc_suspend NULL108#define ac97_soc_resume NULL109#endif110 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};123 124static 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 130static struct platform_driver ac97_codec_driver = {131 .driver = {132 .name = "ac97-codec",133 },134 135 .probe = ac97_probe,136};137 138module_platform_driver(ac97_codec_driver);139 140MODULE_DESCRIPTION("Soc Generic AC97 driver");141MODULE_AUTHOR("Liam Girdwood");142MODULE_LICENSE("GPL");143MODULE_ALIAS("platform:ac97-codec");144