cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

ac97.c (3562B)

      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");