1/*
2 * ac97.c  --  ALSA Soc AC97 codec support
3 *
4 * Copyright 2005 Wolfson Microelectronics PLC.
5 * Author: Liam Girdwood
6 *         liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
7 *
8 *  This program is free software; you can redistribute  it and/or modify it
9 *  under  the terms of  the GNU General  Public License as published by the
10 *  Free Software Foundation;  either version 2 of the  License, or (at your
11 *  option) any later version.
12 *
13 *  Revision history
14 *    17th Oct 2005   Initial version.
15 *
16 * Generic AC97 support.
17 */
18
19#include <linux/init.h>
20#include <linux/kernel.h>
21#include <linux/device.h>
22#include <sound/driver.h>
23#include <sound/core.h>
24#include <sound/pcm.h>
25#include <sound/ac97_codec.h>
26#include <sound/initval.h>
27#include <sound/soc.h>
28
29#define AC97_VERSION "0.6"
30
31static int ac97_prepare(struct snd_pcm_substream *substream)
32{
33	struct snd_pcm_runtime *runtime = substream->runtime;
34	struct snd_soc_pcm_runtime *rtd = substream->private_data;
35	struct snd_soc_device *socdev = rtd->socdev;
36	struct snd_soc_codec *codec = socdev->codec;
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(codec->ac97, reg, runtime->rate);
41}
42
43#define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
44		SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000)
45
46struct snd_soc_codec_dai ac97_dai = {
47	.name = "AC97 HiFi",
48	.type = SND_SOC_DAI_AC97,
49	.playback = {
50		.stream_name = "AC97 Playback",
51		.channels_min = 1,
52		.channels_max = 2,
53		.rates = STD_AC97_RATES,
54		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
55	.capture = {
56		.stream_name = "AC97 Capture",
57		.channels_min = 1,
58		.channels_max = 2,
59		.rates = STD_AC97_RATES,
60		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
61	.ops = {
62		.prepare = ac97_prepare,},
63};
64EXPORT_SYMBOL_GPL(ac97_dai);
65
66static unsigned int ac97_read(struct snd_soc_codec *codec,
67	unsigned int reg)
68{
69	return soc_ac97_ops.read(codec->ac97, reg);
70}
71
72static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
73	unsigned int val)
74{
75	soc_ac97_ops.write(codec->ac97, reg, val);
76	return 0;
77}
78
79static int ac97_soc_probe(struct platform_device *pdev)
80{
81	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
82	struct snd_soc_codec *codec;
83	struct snd_ac97_bus *ac97_bus;
84	struct snd_ac97_template ac97_template;
85	int ret = 0;
86
87	printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);
88
89	socdev->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
90	if (socdev->codec == NULL)
91		return -ENOMEM;
92	codec = socdev->codec;
93	mutex_init(&codec->mutex);
94
95	codec->name = "AC97";
96	codec->owner = THIS_MODULE;
97	codec->dai = &ac97_dai;
98	codec->num_dai = 1;
99	codec->write = ac97_write;
100	codec->read = ac97_read;
101	INIT_LIST_HEAD(&codec->dapm_widgets);
102	INIT_LIST_HEAD(&codec->dapm_paths);
103
104	/* register pcms */
105	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
106	if(ret < 0)
107		goto err;
108
109	/* add codec as bus device for standard ac97 */
110	ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus);
111	if(ret < 0)
112		goto bus_err;
113
114	memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
115	ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
116	if(ret < 0)
117		goto bus_err;
118
119	ret = snd_soc_register_card(socdev);
120	if (ret < 0)
121		goto bus_err;
122	return 0;
123
124bus_err:
125	snd_soc_free_pcms(socdev);
126
127err:
128	kfree(socdev->codec->reg_cache);
129	kfree(socdev->codec);
130	socdev->codec = NULL;
131	return ret;
132}
133
134static int ac97_soc_remove(struct platform_device *pdev)
135{
136	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
137	struct snd_soc_codec *codec = socdev->codec;
138
139	if(codec == NULL)
140		return 0;
141
142	snd_soc_free_pcms(socdev);
143	kfree(socdev->codec->reg_cache);
144	kfree(socdev->codec);
145
146	return 0;
147}
148
149struct snd_soc_codec_device soc_codec_dev_ac97= {
150	.probe = 	ac97_soc_probe,
151	.remove = 	ac97_soc_remove,
152};
153
154EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);
155
156MODULE_DESCRIPTION("Soc Generic AC97 driver");
157MODULE_AUTHOR("Liam Girdwood");
158MODULE_LICENSE("GPL");
159