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/core.h>
23 #include <sound/pcm.h>
24 #include <sound/ac97_codec.h>
25 #include <sound/initval.h>
26 #include <sound/soc.h>
27
28 #define AC97_VERSION "0.6"
29
30 static int ac97_prepare(struct snd_pcm_substream *substream)
31 {
32 struct snd_pcm_runtime *runtime = substream->runtime;
33 struct snd_soc_pcm_runtime *rtd = substream->private_data;
34 struct snd_soc_device *socdev = rtd->socdev;
35 struct snd_soc_codec *codec = socdev->codec;
36
37 int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
38 AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
39 return snd_ac97_set_rate(codec->ac97, reg, runtime->rate);
40 }
41
42 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
43 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000)
44
45 struct snd_soc_codec_dai ac97_dai = {
46 .name = "AC97 HiFi",
47 .type = SND_SOC_DAI_AC97,
48 .playback = {
49 .stream_name = "AC97 Playback",
50 .channels_min = 1,
51 .channels_max = 2,
52 .rates = STD_AC97_RATES,
53 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
54 .capture = {
55 .stream_name = "AC97 Capture",
56 .channels_min = 1,
57 .channels_max = 2,
58 .rates = STD_AC97_RATES,
59 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
60 .ops = {
61 .prepare = ac97_prepare,},
62 };
63 EXPORT_SYMBOL_GPL(ac97_dai);
64
65 static unsigned int ac97_read(struct snd_soc_codec *codec,
66 unsigned int reg)
67 {
68 return soc_ac97_ops.read(codec->ac97, reg);
69 }
70
71 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
72 unsigned int val)
73 {
74 soc_ac97_ops.write(codec->ac97, reg, val);
75 return 0;
76 }
77
78 static int ac97_soc_probe(struct platform_device *pdev)
79 {
80 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
81 struct snd_soc_codec *codec;
82 struct snd_ac97_bus *ac97_bus;
83 struct snd_ac97_template ac97_template;
84 int ret = 0;
85
86 printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);
87
88 socdev->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
89 if (socdev->codec == NULL)
90 return -ENOMEM;
91 codec = socdev->codec;
92 mutex_init(&codec->mutex);
93
94 codec->name = "AC97";
95 codec->owner = THIS_MODULE;
96 codec->dai = &ac97_dai;
97 codec->num_dai = 1;
98 codec->write = ac97_write;
99 codec->read = ac97_read;
100 INIT_LIST_HEAD(&codec->dapm_widgets);
101 INIT_LIST_HEAD(&codec->dapm_paths);
102
103 /* register pcms */
104 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
105 if(ret < 0)
106 goto err;
107
108 /* add codec as bus device for standard ac97 */
109 ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus);
110 if(ret < 0)
111 goto bus_err;
112
113 memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
114 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
115 if(ret < 0)
116 goto bus_err;
117
118 ret = snd_soc_register_card(socdev);
119 if (ret < 0)
120 goto bus_err;
121 return 0;
122
123 bus_err:
124 snd_soc_free_pcms(socdev);
125
126 err:
127 kfree(socdev->codec->reg_cache);
128 kfree(socdev->codec);
129 socdev->codec = NULL;
130 return ret;
131 }
132
133 static int ac97_soc_remove(struct platform_device *pdev)
134 {
135 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
136 struct snd_soc_codec *codec = socdev->codec;
137
138 if(codec == NULL)
139 return 0;
140
141 snd_soc_free_pcms(socdev);
142 kfree(socdev->codec->reg_cache);
143 kfree(socdev->codec);
144
145 return 0;
146 }
147
148 struct snd_soc_codec_device soc_codec_dev_ac97= {
149 .probe = ac97_soc_probe,
150 .remove = ac97_soc_remove,
151 };
152
153 EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);
154
155 MODULE_DESCRIPTION("Soc Generic AC97 driver");
156 MODULE_AUTHOR("Liam Girdwood");
157 MODULE_LICENSE("GPL");
158
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