blob: cd987de341f53e72d8933798849de2eea1b95e80 [file] [log] [blame]
Mark Brown7aae8162009-11-10 16:08:04 +00001/*
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
Mark Brown848dd8b2011-04-27 18:16:32 +010016#include <linux/platform_device.h>
Mark Brown7aae8162009-11-10 16:08:04 +000017#include <sound/core.h>
18#include <sound/pcm.h>
19#include <sound/pcm_params.h>
20#include <sound/soc.h>
21
22int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
23{
24 return sample_size * channels * tdm_slots;
25}
26EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);
27
28int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
29{
30 int sample_size;
31
Mark Brown3d8b2ce2011-01-31 20:14:38 +000032 sample_size = snd_pcm_format_width(params_format(params));
33 if (sample_size < 0)
34 return sample_size;
Mark Brown7aae8162009-11-10 16:08:04 +000035
36 return snd_soc_calc_frame_size(sample_size, params_channels(params),
37 1);
38}
39EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
40
Mark Brownc0fa59d2009-11-19 11:36:10 +000041int 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}
45EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);
46
Mark Brown7aae8162009-11-10 16:08:04 +000047int 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}
58EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
Mark Brown848dd8b2011-04-27 18:16:32 +010059
Mark Brown4957ef02011-12-05 20:50:45 +000060static const struct snd_pcm_hardware dummy_dma_hardware = {
61 .formats = 0xffffffff,
62 .channels_min = 1,
63 .channels_max = UINT_MAX,
64
65 /* Random values to keep userspace happy when checking constraints */
66 .info = SNDRV_PCM_INFO_INTERLEAVED |
67 SNDRV_PCM_INFO_BLOCK_TRANSFER,
68 .buffer_bytes_max = 128*1024,
69 .period_bytes_min = PAGE_SIZE,
70 .period_bytes_max = PAGE_SIZE*2,
71 .periods_min = 2,
72 .periods_max = 128,
73};
74
75static int dummy_dma_open(struct snd_pcm_substream *substream)
76{
77 snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
78
79 return 0;
80}
81
82static struct snd_pcm_ops dummy_dma_ops = {
83 .open = dummy_dma_open,
84 .ioctl = snd_pcm_lib_ioctl,
85};
86
87static struct snd_soc_platform_driver dummy_platform = {
88 .ops = &dummy_dma_ops,
89};
Mark Brown848dd8b2011-04-27 18:16:32 +010090
91static __devinit int snd_soc_dummy_probe(struct platform_device *pdev)
92{
93 return snd_soc_register_platform(&pdev->dev, &dummy_platform);
94}
95
96static __devexit int snd_soc_dummy_remove(struct platform_device *pdev)
97{
98 snd_soc_unregister_platform(&pdev->dev);
99
100 return 0;
101}
102
103static struct platform_driver soc_dummy_driver = {
104 .driver = {
105 .name = "snd-soc-dummy",
106 .owner = THIS_MODULE,
107 },
108 .probe = snd_soc_dummy_probe,
109 .remove = __devexit_p(snd_soc_dummy_remove),
110};
111
112static struct platform_device *soc_dummy_dev;
113
Mark Brownfb257892011-04-28 10:57:54 +0100114int __init snd_soc_util_init(void)
Mark Brown848dd8b2011-04-27 18:16:32 +0100115{
116 int ret;
117
118 soc_dummy_dev = platform_device_alloc("snd-soc-dummy", -1);
119 if (!soc_dummy_dev)
120 return -ENOMEM;
121
122 ret = platform_device_add(soc_dummy_dev);
123 if (ret != 0) {
124 platform_device_put(soc_dummy_dev);
125 return ret;
126 }
127
128 ret = platform_driver_register(&soc_dummy_driver);
129 if (ret != 0)
130 platform_device_unregister(soc_dummy_dev);
131
132 return ret;
133}
Mark Brown848dd8b2011-04-27 18:16:32 +0100134
Mark Brownfb257892011-04-28 10:57:54 +0100135void __exit snd_soc_util_exit(void)
Mark Brown848dd8b2011-04-27 18:16:32 +0100136{
137 platform_device_unregister(soc_dummy_dev);
138 platform_driver_unregister(&soc_dummy_driver);
139}