tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
23int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
24{
25 return sample_size * channels * tdm_slots;
26}
27EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
28
29int 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}
40EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
41
42int 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}
46EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
47
48int 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}
59EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
60
61static const struct snd_pcm_hardware dummy_dma_hardware = {
62 .formats = 0xffffffff,
63 .channels_min = 1,
64 .channels_max = UINT_MAX,
65
66 /* Random values to keep userspace happy when checking constraints */
67 .info = SNDRV_PCM_INFO_INTERLEAVED |
68 SNDRV_PCM_INFO_BLOCK_TRANSFER,
69 .buffer_bytes_max = 128*1024,
70 .period_bytes_min = PAGE_SIZE,
71 .period_bytes_max = PAGE_SIZE*2,
72 .periods_min = 2,
73 .periods_max = 128,
74};
75
76static int dummy_dma_open(struct snd_pcm_substream *substream)
77{
78 snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
79
80 return 0;
81}
82
83static struct snd_pcm_ops dummy_dma_ops = {
84 .open = dummy_dma_open,
85 .ioctl = snd_pcm_lib_ioctl,
86};
87
88static struct snd_soc_platform_driver dummy_platform = {
89 .ops = &dummy_dma_ops,
90};
91
92static struct snd_soc_codec_driver dummy_codec;
93static struct snd_soc_dai_driver dummy_dai = {
94 .name = "snd-soc-dummy-dai",
95};
96
97static __devinit int snd_soc_dummy_probe(struct platform_device *pdev)
98{
99 int ret;
100
101 ret = snd_soc_register_codec(&pdev->dev, &dummy_codec, &dummy_dai, 1);
102 if (ret < 0)
103 return ret;
104
105 ret = snd_soc_register_platform(&pdev->dev, &dummy_platform);
106 if (ret < 0) {
107 snd_soc_unregister_codec(&pdev->dev);
108 return ret;
109 }
110
111 return ret;
112}
113
114static __devexit int snd_soc_dummy_remove(struct platform_device *pdev)
115{
116 snd_soc_unregister_platform(&pdev->dev);
117 snd_soc_unregister_codec(&pdev->dev);
118
119 return 0;
120}
121
122static struct platform_driver soc_dummy_driver = {
123 .driver = {
124 .name = "snd-soc-dummy",
125 .owner = THIS_MODULE,
126 },
127 .probe = snd_soc_dummy_probe,
128 .remove = __devexit_p(snd_soc_dummy_remove),
129};
130
131static struct platform_device *soc_dummy_dev;
132
133int __init snd_soc_util_init(void)
134{
135 int ret;
136
137 soc_dummy_dev = platform_device_alloc("snd-soc-dummy", -1);
138 if (!soc_dummy_dev)
139 return -ENOMEM;
140
141 ret = platform_device_add(soc_dummy_dev);
142 if (ret != 0) {
143 platform_device_put(soc_dummy_dev);
144 return ret;
145 }
146
147 ret = platform_driver_register(&soc_dummy_driver);
148 if (ret != 0)
149 platform_device_unregister(soc_dummy_dev);
150
151 return ret;
152}
153
154void __exit snd_soc_util_exit(void)
155{
156 platform_device_unregister(soc_dummy_dev);
157 platform_driver_unregister(&soc_dummy_driver);
158}