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 <linux/of.h>
 17#include <sound/core.h>
 18#include <sound/pcm.h>
 19#include <sound/ac97_codec.h>
 20#include <sound/initval.h>
 21#include <sound/soc.h>
 22
 23static const struct snd_soc_dapm_widget ac97_widgets[] = {
 24	SND_SOC_DAPM_INPUT("RX"),
 25	SND_SOC_DAPM_OUTPUT("TX"),
 26};
 27
 28static const struct snd_soc_dapm_route ac97_routes[] = {
 29	{ "AC97 Capture", NULL, "RX" },
 30	{ "TX", NULL, "AC97 Playback" },
 31};
 32
 33static int ac97_prepare(struct snd_pcm_substream *substream,
 34			struct snd_soc_dai *dai)
 35{
 36	struct snd_soc_component *component = dai->component;
 37	struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(component);
 38
 39	int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 40		  AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
 41	return snd_ac97_set_rate(ac97, reg, substream->runtime->rate);
 42}
 43
 44static const struct snd_soc_dai_ops ac97_dai_ops = {
 45	.prepare	= ac97_prepare,
 46};
 47
 48static struct snd_soc_dai_driver ac97_dai = {
 49	.name = "ac97-hifi",
 50	.playback = {
 51		.stream_name = "AC97 Playback",
 52		.channels_min = 1,
 53		.channels_max = 2,
 54		.rates = SNDRV_PCM_RATE_KNOT,
 55		.formats = SND_SOC_STD_AC97_FMTS,},
 56	.capture = {
 57		.stream_name = "AC97 Capture",
 58		.channels_min = 1,
 59		.channels_max = 2,
 60		.rates = SNDRV_PCM_RATE_KNOT,
 61		.formats = SND_SOC_STD_AC97_FMTS,},
 62	.ops = &ac97_dai_ops,
 63};
 64
 65static int ac97_soc_probe(struct snd_soc_component *component)
 66{
 67	struct snd_ac97 *ac97;
 68	struct snd_ac97_bus *ac97_bus;
 69	struct snd_ac97_template ac97_template;
 70	int ret;
 71
 72	/* add codec as bus device for standard ac97 */
 73	ret = snd_ac97_bus(component->card->snd_card, 0, soc_ac97_ops,
 74			   NULL, &ac97_bus);
 75	if (ret < 0)
 76		return ret;
 77
 78	memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
 79	ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97);
 80	if (ret < 0)
 81		return ret;
 82
 83	snd_soc_component_set_drvdata(component, ac97);
 84
 85	return 0;
 86}
 87
 88#ifdef CONFIG_PM
 89static int ac97_soc_suspend(struct snd_soc_component *component)
 90{
 91	struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(component);
 92
 93	snd_ac97_suspend(ac97);
 94
 95	return 0;
 96}
 97
 98static int ac97_soc_resume(struct snd_soc_component *component)
 99{
100
101	struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(component);
102
103	snd_ac97_resume(ac97);
104
105	return 0;
106}
107#else
108#define ac97_soc_suspend NULL
109#define ac97_soc_resume NULL
110#endif
111
112static const struct snd_soc_component_driver soc_component_dev_ac97 = {
113	.probe			= ac97_soc_probe,
114	.suspend		= ac97_soc_suspend,
115	.resume			= ac97_soc_resume,
116	.dapm_widgets		= ac97_widgets,
117	.num_dapm_widgets	= ARRAY_SIZE(ac97_widgets),
118	.dapm_routes		= ac97_routes,
119	.num_dapm_routes	= ARRAY_SIZE(ac97_routes),
120	.idle_bias_on		= 1,
121	.use_pmdown_time	= 1,
122	.endianness		= 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
131#ifdef CONFIG_OF
132static const struct of_device_id ac97_codec_of_match[] = {
133	{ .compatible = "realtek,alc203", },
134	{ }
135};
136MODULE_DEVICE_TABLE(of, ac97_codec_of_match);
137#endif
138
139static struct platform_driver ac97_codec_driver = {
140	.driver = {
141		.name = "ac97-codec",
142		.of_match_table = of_match_ptr(ac97_codec_of_match),
143	},
144
145	.probe = ac97_probe,
146};
147
148module_platform_driver(ac97_codec_driver);
149
150MODULE_DESCRIPTION("Soc Generic AC97 driver");
151MODULE_AUTHOR("Liam Girdwood");
152MODULE_LICENSE("GPL");
153MODULE_ALIAS("platform:ac97-codec");