1/*
2 * ac97.c  --  ALSA Soc AC97 codec support
3 *
4 * Copyright 2005 Wolfson Microelectronics PLC.
5 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
6 *
7 *  This program is free software; you can redistribute  it and/or modify it
8 *  under  the terms of  the GNU General  Public License as published by the
9 *  Free Software Foundation;  either version 2 of the  License, or (at your
10 *  option) any later version.
11 *
12 * Generic AC97 support.
13 */
14
15#include <linux/init.h>
16#include <linux/slab.h>
17#include <linux/kernel.h>
18#include <linux/device.h>
19#include <linux/module.h>
20#include <sound/core.h>
21#include <sound/pcm.h>
22#include <sound/ac97_codec.h>
23#include <sound/initval.h>
24#include <sound/soc.h>
25
26static const struct snd_soc_dapm_widget ac97_widgets[] = {
27	SND_SOC_DAPM_INPUT("RX"),
28	SND_SOC_DAPM_OUTPUT("TX"),
29};
30
31static const struct snd_soc_dapm_route ac97_routes[] = {
32	{ "AC97 Capture", NULL, "RX" },
33	{ "TX", NULL, "AC97 Playback" },
34};
35
36static int ac97_prepare(struct snd_pcm_substream *substream,
37			struct snd_soc_dai *dai)
38{
39	struct snd_soc_codec *codec = dai->codec;
40	struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec);
41
42	int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
43		  AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
44	return snd_ac97_set_rate(ac97, reg, substream->runtime->rate);
45}
46
47#define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
48		SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
49		SNDRV_PCM_RATE_48000)
50
51static const struct snd_soc_dai_ops ac97_dai_ops = {
52	.prepare	= ac97_prepare,
53};
54
55static struct snd_soc_dai_driver ac97_dai = {
56	.name = "ac97-hifi",
57	.playback = {
58		.stream_name = "AC97 Playback",
59		.channels_min = 1,
60		.channels_max = 2,
61		.rates = STD_AC97_RATES,
62		.formats = SND_SOC_STD_AC97_FMTS,},
63	.capture = {
64		.stream_name = "AC97 Capture",
65		.channels_min = 1,
66		.channels_max = 2,
67		.rates = STD_AC97_RATES,
68		.formats = SND_SOC_STD_AC97_FMTS,},
69	.ops = &ac97_dai_ops,
70};
71
72static int ac97_soc_probe(struct snd_soc_codec *codec)
73{
74	struct snd_ac97 *ac97;
75	struct snd_ac97_bus *ac97_bus;
76	struct snd_ac97_template ac97_template;
77	int ret;
78
79	/* add codec as bus device for standard ac97 */
80	ret = snd_ac97_bus(codec->component.card->snd_card, 0, soc_ac97_ops,
81			   NULL, &ac97_bus);
82	if (ret < 0)
83		return ret;
84
85	memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
86	ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97);
87	if (ret < 0)
88		return ret;
89
90	snd_soc_codec_set_drvdata(codec, ac97);
91
92	return 0;
93}
94
95#ifdef CONFIG_PM
96static int ac97_soc_suspend(struct snd_soc_codec *codec)
97{
98	struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec);
99
100	snd_ac97_suspend(ac97);
101
102	return 0;
103}
104
105static int ac97_soc_resume(struct snd_soc_codec *codec)
106{
107
108	struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec);
109
110	snd_ac97_resume(ac97);
111
112	return 0;
113}
114#else
115#define ac97_soc_suspend NULL
116#define ac97_soc_resume NULL
117#endif
118
119static struct snd_soc_codec_driver soc_codec_dev_ac97 = {
120	.probe = 	ac97_soc_probe,
121	.suspend =	ac97_soc_suspend,
122	.resume =	ac97_soc_resume,
123
124	.dapm_widgets = ac97_widgets,
125	.num_dapm_widgets = ARRAY_SIZE(ac97_widgets),
126	.dapm_routes = ac97_routes,
127	.num_dapm_routes = ARRAY_SIZE(ac97_routes),
128};
129
130static int ac97_probe(struct platform_device *pdev)
131{
132	return snd_soc_register_codec(&pdev->dev,
133			&soc_codec_dev_ac97, &ac97_dai, 1);
134}
135
136static int ac97_remove(struct platform_device *pdev)
137{
138	snd_soc_unregister_codec(&pdev->dev);
139	return 0;
140}
141
142static struct platform_driver ac97_codec_driver = {
143	.driver = {
144		.name = "ac97-codec",
145	},
146
147	.probe = ac97_probe,
148	.remove = ac97_remove,
149};
150
151module_platform_driver(ac97_codec_driver);
152
153MODULE_DESCRIPTION("Soc Generic AC97 driver");
154MODULE_AUTHOR("Liam Girdwood");
155MODULE_LICENSE("GPL");
156MODULE_ALIAS("platform:ac97-codec");
157