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)
104/*
105 * The dummy CODEC is only meant to be used in situations where there is no
106 * actual hardware.
107 *
108 * If there is actual hardware even if it does not have a control bus
109 * the hardware will still have constraints like supported samplerates, etc.
110 * which should be modelled. And the data flow graph also should be modelled
111 * using DAPM.
112 */
113static struct snd_soc_dai_driver dummy_dai = {
114	.name = "snd-soc-dummy-dai",
115	.playback = {
116		.stream_name	= "Playback",
117		.channels_min	= 1,
118		.channels_max	= 384,
119		.rates		= STUB_RATES,
120		.formats	= STUB_FORMATS,
121	},
122	.capture = {
123		.stream_name	= "Capture",
124		.channels_min	= 1,
125		.channels_max	= 384,
126		.rates = STUB_RATES,
127		.formats = STUB_FORMATS,
128	 },
129};
130
131int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
132{
133	if (dai->driver == &dummy_dai)
134		return 1;
135	return 0;
136}
137
138static int snd_soc_dummy_probe(struct platform_device *pdev)
139{
140	int ret;
141
142	ret = snd_soc_register_codec(&pdev->dev, &dummy_codec, &dummy_dai, 1);
143	if (ret < 0)
144		return ret;
145
146	ret = snd_soc_register_platform(&pdev->dev, &dummy_platform);
147	if (ret < 0) {
148		snd_soc_unregister_codec(&pdev->dev);
149		return ret;
150	}
151
152	return ret;
153}
154
155static int snd_soc_dummy_remove(struct platform_device *pdev)
156{
157	snd_soc_unregister_platform(&pdev->dev);
158	snd_soc_unregister_codec(&pdev->dev);
159
160	return 0;
161}
162
163static struct platform_driver soc_dummy_driver = {
164	.driver = {
165		.name = "snd-soc-dummy",
166	},
167	.probe = snd_soc_dummy_probe,
168	.remove = snd_soc_dummy_remove,
169};
170
171static struct platform_device *soc_dummy_dev;
172
173int __init snd_soc_util_init(void)
174{
175	int ret;
176
177	soc_dummy_dev =
178		platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
179	if (IS_ERR(soc_dummy_dev))
180		return PTR_ERR(soc_dummy_dev);
181
182	ret = platform_driver_register(&soc_dummy_driver);
183	if (ret != 0)
184		platform_device_unregister(soc_dummy_dev);
185
186	return ret;
187}
188
189void __exit snd_soc_util_exit(void)
190{
191	platform_device_unregister(soc_dummy_dev);
192	platform_driver_unregister(&soc_dummy_driver);
193}
194