tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip
3 *
4 * Author: Nicolas Pitre
5 * Created: Nov 30, 2004
6 * Copyright: (C) 2004 MontaVista Software, Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/module.h>
14#include <sound/core.h>
15#include <sound/pxa2xx-lib.h>
16
17#include "pxa2xx-pcm.h"
18
19static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
20{
21 struct pxa2xx_pcm_client *client = substream->private_data;
22
23 __pxa2xx_pcm_prepare(substream);
24
25 return client->prepare(substream);
26}
27
28static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
29{
30 struct pxa2xx_pcm_client *client = substream->private_data;
31 struct snd_pcm_runtime *runtime = substream->runtime;
32 struct pxa2xx_runtime_data *rtd;
33 int ret;
34
35 ret = __pxa2xx_pcm_open(substream);
36 if (ret)
37 goto out;
38
39 rtd = runtime->private_data;
40
41 rtd->params = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
42 client->playback_params : client->capture_params;
43 ret = pxa_request_dma(rtd->params->name, DMA_PRIO_LOW,
44 pxa2xx_pcm_dma_irq, substream);
45 if (ret < 0)
46 goto err2;
47 rtd->dma_ch = ret;
48
49 ret = client->startup(substream);
50 if (!ret)
51 goto out;
52
53 pxa_free_dma(rtd->dma_ch);
54 err2:
55 __pxa2xx_pcm_close(substream);
56 out:
57 return ret;
58}
59
60static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
61{
62 struct pxa2xx_pcm_client *client = substream->private_data;
63 struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
64
65 pxa_free_dma(rtd->dma_ch);
66 client->shutdown(substream);
67
68 return __pxa2xx_pcm_close(substream);
69}
70
71static struct snd_pcm_ops pxa2xx_pcm_ops = {
72 .open = pxa2xx_pcm_open,
73 .close = pxa2xx_pcm_close,
74 .ioctl = snd_pcm_lib_ioctl,
75 .hw_params = __pxa2xx_pcm_hw_params,
76 .hw_free = __pxa2xx_pcm_hw_free,
77 .prepare = pxa2xx_pcm_prepare,
78 .trigger = pxa2xx_pcm_trigger,
79 .pointer = pxa2xx_pcm_pointer,
80 .mmap = pxa2xx_pcm_mmap,
81};
82
83static u64 pxa2xx_pcm_dmamask = 0xffffffff;
84
85int pxa2xx_pcm_new(struct snd_card *card, struct pxa2xx_pcm_client *client,
86 struct snd_pcm **rpcm)
87{
88 struct snd_pcm *pcm;
89 int play = client->playback_params ? 1 : 0;
90 int capt = client->capture_params ? 1 : 0;
91 int ret;
92
93 ret = snd_pcm_new(card, "PXA2xx-PCM", 0, play, capt, &pcm);
94 if (ret)
95 goto out;
96
97 pcm->private_data = client;
98 pcm->private_free = pxa2xx_pcm_free_dma_buffers;
99
100 if (!card->dev->dma_mask)
101 card->dev->dma_mask = &pxa2xx_pcm_dmamask;
102 if (!card->dev->coherent_dma_mask)
103 card->dev->coherent_dma_mask = 0xffffffff;
104
105 if (play) {
106 int stream = SNDRV_PCM_STREAM_PLAYBACK;
107 snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
108 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
109 if (ret)
110 goto out;
111 }
112 if (capt) {
113 int stream = SNDRV_PCM_STREAM_CAPTURE;
114 snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
115 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
116 if (ret)
117 goto out;
118 }
119
120 if (rpcm)
121 *rpcm = pcm;
122 ret = 0;
123
124 out:
125 return ret;
126}
127
128EXPORT_SYMBOL(pxa2xx_pcm_new);
129
130MODULE_AUTHOR("Nicolas Pitre");
131MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
132MODULE_LICENSE("GPL");