spear_pcm.c
1.78 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
/*
* ALSA PCM interface for ST SPEAr Processors
*
* sound/soc/spear/spear_pcm.c
*
* Copyright (C) 2012 ST Microelectronics
* Rajeev Kumar<rajeevkumar.linux@gmail.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/module.h>
#include <linux/dmaengine.h>
#include <linux/platform_device.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/spear_dma.h>
#include "spear_pcm.h"
static const struct snd_pcm_hardware spear_pcm_hardware = {
.info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME),
.buffer_bytes_max = 16 * 1024, /* max buffer size */
.period_bytes_min = 2 * 1024, /* 1 msec data minimum period size */
.period_bytes_max = 2 * 1024, /* maximum period size */
.periods_min = 1, /* min # periods */
.periods_max = 8, /* max # of periods */
.fifo_size = 0, /* fifo size in bytes */
};
static const struct snd_dmaengine_pcm_config spear_dmaengine_pcm_config = {
.pcm_hardware = &spear_pcm_hardware,
.prealloc_buffer_size = 16 * 1024,
};
int devm_spear_pcm_platform_register(struct device *dev,
struct snd_dmaengine_pcm_config *config,
bool (*filter)(struct dma_chan *chan, void *slave))
{
*config = spear_dmaengine_pcm_config;
config->compat_filter_fn = filter;
return devm_snd_dmaengine_pcm_register(dev, config,
SND_DMAENGINE_PCM_FLAG_NO_DT |
SND_DMAENGINE_PCM_FLAG_COMPAT);
}
EXPORT_SYMBOL_GPL(devm_spear_pcm_platform_register);
MODULE_AUTHOR("Rajeev Kumar <rajeevkumar.linux@gmail.com>");
MODULE_DESCRIPTION("SPEAr PCM DMA module");
MODULE_LICENSE("GPL");