Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
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 /* Random values to keep userspace happy when checking constraints */
63 .info = SNDRV_PCM_INFO_INTERLEAVED |
64 SNDRV_PCM_INFO_BLOCK_TRANSFER,
65 .buffer_bytes_max = 128*1024,
66 .period_bytes_min = PAGE_SIZE,
67 .period_bytes_max = PAGE_SIZE*2,
68 .periods_min = 2,
69 .periods_max = 128,
70};
71
72static int dummy_dma_open(struct snd_pcm_substream *substream)
73{
74 struct snd_soc_pcm_runtime *rtd = substream->private_data;
75
76 /* BE's dont need dummy params */
77 if (!rtd->dai_link->no_pcm)
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;
93
94#define STUB_RATES SNDRV_PCM_RATE_8000_192000
95#define STUB_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
96 SNDRV_PCM_FMTBIT_U8 | \
97 SNDRV_PCM_FMTBIT_S16_LE | \
98 SNDRV_PCM_FMTBIT_U16_LE | \
99 SNDRV_PCM_FMTBIT_S24_LE | \
100 SNDRV_PCM_FMTBIT_U24_LE | \
101 SNDRV_PCM_FMTBIT_S32_LE | \
102 SNDRV_PCM_FMTBIT_U32_LE | \
103 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
104static struct snd_soc_dai_driver dummy_dai = {
105 .name = "snd-soc-dummy-dai",
106 .playback = {
107 .stream_name = "Playback",
108 .channels_min = 1,
109 .channels_max = 384,
110 .rates = STUB_RATES,
111 .formats = STUB_FORMATS,
112 },
113 .capture = {
114 .stream_name = "Capture",
115 .channels_min = 1,
116 .channels_max = 384,
117 .rates = STUB_RATES,
118 .formats = STUB_FORMATS,
119 },
120};
121
122int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
123{
124 if (dai->driver == &dummy_dai)
125 return 1;
126 return 0;
127}
128
129static int snd_soc_dummy_probe(struct platform_device *pdev)
130{
131 int ret;
132
133 ret = snd_soc_register_codec(&pdev->dev, &dummy_codec, &dummy_dai, 1);
134 if (ret < 0)
135 return ret;
136
137 ret = snd_soc_register_platform(&pdev->dev, &dummy_platform);
138 if (ret < 0) {
139 snd_soc_unregister_codec(&pdev->dev);
140 return ret;
141 }
142
143 return ret;
144}
145
146static int snd_soc_dummy_remove(struct platform_device *pdev)
147{
148 snd_soc_unregister_platform(&pdev->dev);
149 snd_soc_unregister_codec(&pdev->dev);
150
151 return 0;
152}
153
154static struct platform_driver soc_dummy_driver = {
155 .driver = {
156 .name = "snd-soc-dummy",
157 .owner = THIS_MODULE,
158 },
159 .probe = snd_soc_dummy_probe,
160 .remove = snd_soc_dummy_remove,
161};
162
163static struct platform_device *soc_dummy_dev;
164
165int __init snd_soc_util_init(void)
166{
167 int ret;
168
169 soc_dummy_dev =
170 platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
171 if (IS_ERR(soc_dummy_dev))
172 return PTR_ERR(soc_dummy_dev);
173
174 ret = platform_driver_register(&soc_dummy_driver);
175 if (ret != 0)
176 platform_device_unregister(soc_dummy_dev);
177
178 return ret;
179}
180
181void __exit snd_soc_util_exit(void)
182{
183 platform_device_unregister(soc_dummy_dev);
184 platform_driver_unregister(&soc_dummy_driver);
185}