staging: ozwpan: Add module parameter description
[linux/fpc-iii.git] / sound / soc / cirrus / ep93xx-pcm.c
blob5f664471d99ee480fd38bd723e65d8023462973c
1 /*
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,
36 .periods_min = 1,
37 .periods_max = 32,
38 .fifo_size = 32,
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)) {
46 chan->private = data;
47 return true;
50 return false;
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");