2 * soc-util.c -- ALSA SoC Audio Layer utility functions
4 * Copyright 2009 Wolfson Microelectronics PLC.
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 * Liam Girdwood <lrg@slimlogic.co.uk>
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.
16 #include <linux/platform_device.h>
17 #include <sound/core.h>
18 #include <sound/pcm.h>
19 #include <sound/pcm_params.h>
20 #include <sound/soc.h>
22 int snd_soc_calc_frame_size(int sample_size
, int channels
, int tdm_slots
)
24 return sample_size
* channels
* tdm_slots
;
26 EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size
);
28 int snd_soc_params_to_frame_size(struct snd_pcm_hw_params
*params
)
32 sample_size
= snd_pcm_format_width(params_format(params
));
36 return snd_soc_calc_frame_size(sample_size
, params_channels(params
),
39 EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size
);
41 int snd_soc_calc_bclk(int fs
, int sample_size
, int channels
, int tdm_slots
)
43 return fs
* snd_soc_calc_frame_size(sample_size
, channels
, tdm_slots
);
45 EXPORT_SYMBOL_GPL(snd_soc_calc_bclk
);
47 int snd_soc_params_to_bclk(struct snd_pcm_hw_params
*params
)
51 ret
= snd_soc_params_to_frame_size(params
);
54 return ret
* params_rate(params
);
58 EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk
);
60 static const struct snd_pcm_hardware dummy_dma_hardware
= {
61 .formats
= 0xffffffff,
63 .channels_max
= UINT_MAX
,
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,
75 static int dummy_dma_open(struct snd_pcm_substream
*substream
)
77 snd_soc_set_runtime_hwparams(substream
, &dummy_dma_hardware
);
82 static struct snd_pcm_ops dummy_dma_ops
= {
83 .open
= dummy_dma_open
,
84 .ioctl
= snd_pcm_lib_ioctl
,
87 static struct snd_soc_platform_driver dummy_platform
= {
88 .ops
= &dummy_dma_ops
,
91 static __devinit
int snd_soc_dummy_probe(struct platform_device
*pdev
)
93 return snd_soc_register_platform(&pdev
->dev
, &dummy_platform
);
96 static __devexit
int snd_soc_dummy_remove(struct platform_device
*pdev
)
98 snd_soc_unregister_platform(&pdev
->dev
);
103 static struct platform_driver soc_dummy_driver
= {
105 .name
= "snd-soc-dummy",
106 .owner
= THIS_MODULE
,
108 .probe
= snd_soc_dummy_probe
,
109 .remove
= __devexit_p(snd_soc_dummy_remove
),
112 static struct platform_device
*soc_dummy_dev
;
114 int __init
snd_soc_util_init(void)
118 soc_dummy_dev
= platform_device_alloc("snd-soc-dummy", -1);
122 ret
= platform_device_add(soc_dummy_dev
);
124 platform_device_put(soc_dummy_dev
);
128 ret
= platform_driver_register(&soc_dummy_driver
);
130 platform_device_unregister(soc_dummy_dev
);
135 void __exit
snd_soc_util_exit(void)
137 platform_device_unregister(soc_dummy_dev
);
138 platform_driver_unregister(&soc_dummy_driver
);