asoc: tegra: aic326x: Don't disable clock if call is active
[linux-2.6.git] / sound / soc / soc-utils.c
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
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
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 }
40 EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);
41
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
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);
60
61 static 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
76 static 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
83 static struct snd_pcm_ops dummy_dma_ops = {
84         .open           = dummy_dma_open,
85         .ioctl          = snd_pcm_lib_ioctl,
86 };
87
88 static struct snd_soc_platform_driver dummy_platform = {
89         .ops = &dummy_dma_ops,
90 };
91
92 static struct snd_soc_codec_driver dummy_codec;
93 static struct snd_soc_dai_driver dummy_dai = {
94         .name = "snd-soc-dummy-dai",
95 };
96
97 static __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
114 static __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
122 static 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
131 static struct platform_device *soc_dummy_dev;
132
133 int __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
154 void __exit snd_soc_util_exit(void)
155 {
156         platform_device_unregister(soc_dummy_dev);
157         platform_driver_unregister(&soc_dummy_driver);
158 }