sound: Add export.h for THIS_MODULE/EXPORT_SYMBOL where needed
[platform/adaptation/renesas_rcar/renesas_kernel.git] / sound / soc / soc-utils.c
1 /*
2  * soc-util.c  --  ALSA SoC Audio Layer utility functions
3  *
4  * Copyright 2009 Wolfson Microelectronics PLC.
5  *
6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7  *         Liam Girdwood <lrg@slimlogic.co.uk>
8  *         
9  *
10  *  This program is free software; you can redistribute  it and/or modify it
11  *  under  the terms of  the GNU General  Public License as published by the
12  *  Free Software Foundation;  either version 2 of the  License, or (at your
13  *  option) any later version.
14  */
15
16 #include <linux/platform_device.h>
17 #include <linux/export.h>
18 #include <sound/core.h>
19 #include <sound/pcm.h>
20 #include <sound/pcm_params.h>
21 #include <sound/soc.h>
22
23 int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
24 {
25         return sample_size * channels * tdm_slots;
26 }
27 EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
28
29 int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
30 {
31         int sample_size;
32
33         sample_size = snd_pcm_format_width(params_format(params));
34         if (sample_size < 0)
35                 return sample_size;
36
37         return snd_soc_calc_frame_size(sample_size, params_channels(params),
38                                        1);
39 }
40 EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
41
42 int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
43 {
44         return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
45 }
46 EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
47
48 int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
49 {
50         int ret;
51
52         ret = snd_soc_params_to_frame_size(params);
53
54         if (ret > 0)
55                 return ret * params_rate(params);
56         else
57                 return ret;
58 }
59 EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
60
61 static struct snd_soc_platform_driver dummy_platform;
62
63 static __devinit int snd_soc_dummy_probe(struct platform_device *pdev)
64 {
65         return snd_soc_register_platform(&pdev->dev, &dummy_platform);
66 }
67
68 static __devexit int snd_soc_dummy_remove(struct platform_device *pdev)
69 {
70         snd_soc_unregister_platform(&pdev->dev);
71
72         return 0;
73 }
74
75 static struct platform_driver soc_dummy_driver = {
76         .driver = {
77                 .name = "snd-soc-dummy",
78                 .owner = THIS_MODULE,
79         },
80         .probe = snd_soc_dummy_probe,
81         .remove = __devexit_p(snd_soc_dummy_remove),
82 };
83
84 static struct platform_device *soc_dummy_dev;
85
86 int __init snd_soc_util_init(void)
87 {
88         int ret;
89
90         soc_dummy_dev = platform_device_alloc("snd-soc-dummy", -1);
91         if (!soc_dummy_dev)
92                 return -ENOMEM;
93
94         ret = platform_device_add(soc_dummy_dev);
95         if (ret != 0) {
96                 platform_device_put(soc_dummy_dev);
97                 return ret;
98         }
99
100         ret = platform_driver_register(&soc_dummy_driver);
101         if (ret != 0)
102                 platform_device_unregister(soc_dummy_dev);
103
104         return ret;
105 }
106
107 void __exit snd_soc_util_exit(void)
108 {
109         platform_device_unregister(soc_dummy_dev);
110         platform_driver_unregister(&soc_dummy_driver);
111 }