2 * linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface
4 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
5 * Copyright (C) 2006 Applied Data Systems
7 * Rewritten for the SoC audio subsystem (Based on PXA2xx code):
8 * Copyright (c) 2008 Ryan Mallon
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/platform_device.h>
18 #include <linux/dmaengine.h>
20 #include <sound/pcm.h>
21 #include <sound/soc.h>
22 #include <sound/dmaengine_pcm.h>
24 #include <linux/platform_data/dma-ep93xx.h>
26 #include "ep93xx-pcm.h"
28 static const struct snd_pcm_hardware ep93xx_pcm_hardware
= {
29 .info
= (SNDRV_PCM_INFO_MMAP
|
30 SNDRV_PCM_INFO_MMAP_VALID
|
31 SNDRV_PCM_INFO_INTERLEAVED
|
32 SNDRV_PCM_INFO_BLOCK_TRANSFER
),
33 .buffer_bytes_max
= 131072,
34 .period_bytes_min
= 32,
35 .period_bytes_max
= 32768,
41 static bool ep93xx_pcm_dma_filter(struct dma_chan
*chan
, void *filter_param
)
43 struct ep93xx_dma_data
*data
= filter_param
;
45 if (data
->direction
== ep93xx_dma_chan_direction(chan
)) {
53 static const struct snd_dmaengine_pcm_config ep93xx_dmaengine_pcm_config
= {
54 .pcm_hardware
= &ep93xx_pcm_hardware
,
55 .compat_filter_fn
= ep93xx_pcm_dma_filter
,
56 .prealloc_buffer_size
= 131072,
59 int devm_ep93xx_pcm_platform_register(struct device
*dev
)
61 return devm_snd_dmaengine_pcm_register(dev
,
62 &ep93xx_dmaengine_pcm_config
,
63 SND_DMAENGINE_PCM_FLAG_NO_RESIDUE
|
64 SND_DMAENGINE_PCM_FLAG_NO_DT
|
65 SND_DMAENGINE_PCM_FLAG_COMPAT
);
67 EXPORT_SYMBOL_GPL(devm_ep93xx_pcm_platform_register
);
69 MODULE_AUTHOR("Ryan Mallon");
70 MODULE_DESCRIPTION("EP93xx ALSA PCM interface");
71 MODULE_LICENSE("GPL");