ec921ec99c2621eaa58b7d0c5e4eb97b861971de
[linux-2.6.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 <sound/core.h>
18 #include <sound/pcm.h>
19 #include <sound/pcm_params.h>
20 #include <sound/soc.h>
21
22 int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
23 {
24         return sample_size * channels * tdm_slots;
25 }
26 EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
27
28 int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
29 {
30         int sample_size;
31
32         sample_size = snd_pcm_format_width(params_format(params));
33         if (sample_size < 0)
34                 return sample_size;
35
36         return snd_soc_calc_frame_size(sample_size, params_channels(params),
37                                        1);
38 }
39 EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
40
41 int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
42 {
43         return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
44 }
45 EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
46
47 int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
48 {
49         int ret;
50
51         ret = snd_soc_params_to_frame_size(params);
52
53         if (ret > 0)
54                 return ret * params_rate(params);
55         else
56                 return ret;
57 }
58 EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
59
60 static struct snd_soc_platform_driver dummy_platform;
61
62 static __devinit int snd_soc_dummy_probe(struct platform_device *pdev)
63 {
64         return snd_soc_register_platform(&pdev->dev, &dummy_platform);
65 }
66
67 static __devexit int snd_soc_dummy_remove(struct platform_device *pdev)
68 {
69         snd_soc_unregister_platform(&pdev->dev);
70
71         return 0;
72 }
73
74 static struct platform_driver soc_dummy_driver = {
75         .driver = {
76                 .name = "snd-soc-dummy",
77                 .owner = THIS_MODULE,
78         },
79         .probe = snd_soc_dummy_probe,
80         .remove = __devexit_p(snd_soc_dummy_remove),
81 };
82
83 static struct platform_device *soc_dummy_dev;
84
85 int __init snd_soc_util_init(void)
86 {
87         int ret;
88
89         soc_dummy_dev = platform_device_alloc("snd-soc-dummy", -1);
90         if (!soc_dummy_dev)
91                 return -ENOMEM;
92
93         ret = platform_device_add(soc_dummy_dev);
94         if (ret != 0) {
95                 platform_device_put(soc_dummy_dev);
96                 return ret;
97         }
98
99         ret = platform_driver_register(&soc_dummy_driver);
100         if (ret != 0)
101                 platform_device_unregister(soc_dummy_dev);
102
103         return ret;
104 }
105
106 void __exit snd_soc_util_exit(void)
107 {
108         platform_device_unregister(soc_dummy_dev);
109         platform_driver_unregister(&soc_dummy_driver);
110 }