Pull misc2-6-36 into release branch
[sfrench/cifs-2.6.git] / sound / soc / codecs / wm8727.c
1 /*
2  * wm8727.c
3  *
4  *  Created on: 15-Oct-2009
5  *      Author: neil.jones@imgtec.com
6  *
7  * Copyright (C) 2009 Imagination Technologies Ltd.
8  *
9  *  This program is free software; you can redistribute  it and/or modify it
10  *  under  the terms of  the GNU General  Public License as published by the
11  *  Free Software Foundation;  either version 2 of the  License, or (at your
12  *  option) any later version.
13  */
14
15 #include <linux/init.h>
16 #include <linux/slab.h>
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/device.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
26 #include "wm8727.h"
27 /*
28  * Note this is a simple chip with no configuration interface, sample rate is
29  * determined automatically by examining the Master clock and Bit clock ratios
30  */
31 #define WM8727_RATES  (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
32                         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 |\
33                         SNDRV_PCM_RATE_192000)
34
35
36 struct snd_soc_dai wm8727_dai = {
37         .name = "WM8727",
38         .playback = {
39                 .stream_name = "Playback",
40                 .channels_min = 2,
41                 .channels_max = 2,
42                 .rates = WM8727_RATES,
43                 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
44                 },
45 };
46 EXPORT_SYMBOL_GPL(wm8727_dai);
47
48 static struct snd_soc_codec *wm8727_codec;
49
50 static int wm8727_soc_probe(struct platform_device *pdev)
51 {
52         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
53         int ret = 0;
54
55         BUG_ON(!wm8727_codec);
56
57         socdev->card->codec = wm8727_codec;
58
59         /* register pcms */
60         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
61         if (ret < 0) {
62                 printk(KERN_ERR "wm8727: failed to create pcms\n");
63                 goto pcm_err;
64         }
65
66         return ret;
67
68 pcm_err:
69         kfree(socdev->card->codec);
70         socdev->card->codec = NULL;
71         return ret;
72 }
73
74 static int wm8727_soc_remove(struct platform_device *pdev)
75 {
76         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
77
78         snd_soc_free_pcms(socdev);
79
80         return 0;
81 }
82
83 struct snd_soc_codec_device soc_codec_dev_wm8727 = {
84         .probe =        wm8727_soc_probe,
85         .remove =       wm8727_soc_remove,
86 };
87 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8727);
88
89
90 static __devinit int wm8727_platform_probe(struct platform_device *pdev)
91 {
92         struct snd_soc_codec *codec;
93         int ret;
94
95         if (wm8727_codec) {
96                 dev_err(&pdev->dev, "Another WM8727 is registered\n");
97                 return -EBUSY;
98         }
99
100         codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
101         if (codec == NULL)
102                 return -ENOMEM;
103         wm8727_codec = codec;
104
105         platform_set_drvdata(pdev, codec);
106
107         mutex_init(&codec->mutex);
108         codec->dev = &pdev->dev;
109         codec->name = "WM8727";
110         codec->owner = THIS_MODULE;
111         codec->dai = &wm8727_dai;
112         codec->num_dai = 1;
113         INIT_LIST_HEAD(&codec->dapm_widgets);
114         INIT_LIST_HEAD(&codec->dapm_paths);
115
116         wm8727_dai.dev = &pdev->dev;
117
118         ret = snd_soc_register_codec(codec);
119         if (ret != 0) {
120                 dev_err(&pdev->dev, "Failed to register CODEC: %d\n", ret);
121                 goto err;
122         }
123
124         ret = snd_soc_register_dai(&wm8727_dai);
125         if (ret != 0) {
126                 dev_err(&pdev->dev, "Failed to register DAI: %d\n", ret);
127                 goto err_codec;
128         }
129
130         return 0;
131
132 err_codec:
133         snd_soc_unregister_codec(codec);
134 err:
135         kfree(codec);
136         return ret;
137 }
138
139 static int __devexit wm8727_platform_remove(struct platform_device *pdev)
140 {
141         snd_soc_unregister_dai(&wm8727_dai);
142         snd_soc_unregister_codec(platform_get_drvdata(pdev));
143         return 0;
144 }
145
146 static struct platform_driver wm8727_codec_driver = {
147         .driver = {
148                         .name = "wm8727-codec",
149                         .owner = THIS_MODULE,
150         },
151
152         .probe = wm8727_platform_probe,
153         .remove = __devexit_p(wm8727_platform_remove),
154 };
155
156 static int __init wm8727_init(void)
157 {
158         return platform_driver_register(&wm8727_codec_driver);
159 }
160 module_init(wm8727_init);
161
162 static void __exit wm8727_exit(void)
163 {
164         platform_driver_unregister(&wm8727_codec_driver);
165 }
166 module_exit(wm8727_exit);
167
168 MODULE_DESCRIPTION("ASoC wm8727 driver");
169 MODULE_AUTHOR("Neil Jones");
170 MODULE_LICENSE("GPL");