ASoC/mpc5200: Track DMA position by period number instead of bytes
[safe/jmp/linux-2.6] / 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/module.h>
17 #include <linux/kernel.h>
18 #include <linux/device.h>
19 #include <sound/core.h>
20 #include <sound/pcm.h>
21 #include <sound/ac97_codec.h>
22 #include <sound/initval.h>
23 #include <sound/soc.h>
24
25 #include "wm8727.h"
26 /*
27  * Note this is a simple chip with no configuration interface, sample rate is
28  * determined automatically by examining the Master clock and Bit clock ratios
29  */
30 #define WM8727_RATES  (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
31                         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 |\
32                         SNDRV_PCM_RATE_192000)
33
34
35 struct snd_soc_dai wm8727_dai = {
36         .name = "WM8727",
37         .playback = {
38                 .stream_name = "Playback",
39                 .channels_min = 2,
40                 .channels_max = 2,
41                 .rates = WM8727_RATES,
42                 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
43                 },
44 };
45 EXPORT_SYMBOL_GPL(wm8727_dai);
46
47 static int wm8727_soc_probe(struct platform_device *pdev)
48 {
49         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
50         struct snd_soc_codec *codec;
51         int ret = 0;
52
53         codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
54         if (codec == NULL)
55                 return -ENOMEM;
56         mutex_init(&codec->mutex);
57         codec->name = "WM8727";
58         codec->owner = THIS_MODULE;
59         codec->dai = &wm8727_dai;
60         codec->num_dai = 1;
61         socdev->card->codec = codec;
62         INIT_LIST_HEAD(&codec->dapm_widgets);
63         INIT_LIST_HEAD(&codec->dapm_paths);
64
65         /* register pcms */
66         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
67         if (ret < 0) {
68                 printk(KERN_ERR "wm8727: failed to create pcms\n");
69                 goto pcm_err;
70         }
71
72         return ret;
73
74 pcm_err:
75         kfree(socdev->card->codec);
76         socdev->card->codec = NULL;
77         return ret;
78 }
79
80 static int wm8727_soc_remove(struct platform_device *pdev)
81 {
82         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
83         struct snd_soc_codec *codec = socdev->card->codec;
84
85         if (codec == NULL)
86                 return 0;
87         snd_soc_free_pcms(socdev);
88         kfree(codec);
89         return 0;
90 }
91
92 struct snd_soc_codec_device soc_codec_dev_wm8727 = {
93         .probe =        wm8727_soc_probe,
94         .remove =       wm8727_soc_remove,
95 };
96 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8727);
97
98
99 static __devinit int wm8727_platform_probe(struct platform_device *pdev)
100 {
101         wm8727_dai.dev = &pdev->dev;
102         return snd_soc_register_dai(&wm8727_dai);
103 }
104
105 static int __devexit wm8727_platform_remove(struct platform_device *pdev)
106 {
107         snd_soc_unregister_dai(&wm8727_dai);
108         return 0;
109 }
110
111 static struct platform_driver wm8727_codec_driver = {
112         .driver = {
113                         .name = "wm8727-codec",
114                         .owner = THIS_MODULE,
115         },
116
117         .probe = wm8727_platform_probe,
118         .remove = __devexit_p(wm8727_platform_remove),
119 };
120
121 static int __init wm8727_init(void)
122 {
123         return platform_driver_register(&wm8727_codec_driver);
124 }
125 module_init(wm8727_init);
126
127 static void __exit wm8727_exit(void)
128 {
129         platform_driver_unregister(&wm8727_codec_driver);
130 }
131 module_exit(wm8727_exit);
132
133 MODULE_DESCRIPTION("ASoC wm8727 driver");
134 MODULE_AUTHOR("Neil Jones");
135 MODULE_LICENSE("GPL");