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7aae816d MB |
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> |
d81a6d71 | 17 | #include <linux/export.h> |
7aae816d MB |
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 | ||
3d8b2ce0 MB |
33 | sample_size = snd_pcm_format_width(params_format(params)); |
34 | if (sample_size < 0) | |
35 | return sample_size; | |
7aae816d MB |
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 | ||
c0fa59df MB |
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 | ||
7aae816d MB |
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); | |
848dd8be MB |
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 | ||
fb257897 | 86 | int __init snd_soc_util_init(void) |
848dd8be MB |
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 | } | |
848dd8be | 106 | |
fb257897 | 107 | void __exit snd_soc_util_exit(void) |
848dd8be MB |
108 | { |
109 | platform_device_unregister(soc_dummy_dev); | |
110 | platform_driver_unregister(&soc_dummy_driver); | |
111 | } |