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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 | ||
848dd8be | 16 | #include <linux/platform_device.h> |
7aae816d MB |
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 | ||
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32 | sample_size = snd_pcm_format_width(params_format(params)); |
33 | if (sample_size < 0) | |
34 | return sample_size; | |
7aae816d MB |
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 | ||
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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 | ||
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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); | |
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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 | ||
fb257897 | 85 | int __init snd_soc_util_init(void) |
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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 | } | |
848dd8be | 105 | |
fb257897 | 106 | void __exit snd_soc_util_exit(void) |
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107 | { |
108 | platform_device_unregister(soc_dummy_dev); | |
109 | platform_driver_unregister(&soc_dummy_driver); | |
110 | } |