kernel/sound/arm/pxa2xx-pcm.c

   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 <linux/dma-mapping.h>
  15 #include <linux/dmaengine.h>
  16
  17 #include <mach/dma.h>
  18
  19 #include <sound/core.h>
  20 #include <sound/pxa2xx-lib.h>
  21 #include <sound/dmaengine_pcm.h>
  22
  23 #include "pxa2xx-pcm.h"
  24
  25 static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
  26 {
  27         struct pxa2xx_pcm_client *client = substream->private_data;
  28
  29         __pxa2xx_pcm_prepare(substream);
  30
  31         return client->prepare(substream);
  32 }
  33
  34 static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
  35 {
  36         struct pxa2xx_pcm_client *client = substream->private_data;
  37         struct snd_pcm_runtime *runtime = substream->runtime;
  38         struct pxa2xx_runtime_data *rtd;
  39         int ret;
  40
  41         ret = __pxa2xx_pcm_open(substream);
  42         if (ret)
  43                 goto out;
  44
  45         rtd = runtime->private_data;
  46
  47         rtd->params = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  48                       client->playback_params : client->capture_params;
  49         ret = pxa_request_dma("dma", DMA_PRIO_LOW,
  50                               pxa2xx_pcm_dma_irq, substream);
  51         if (ret < 0)
  52                 goto err2;
  53         rtd->dma_ch = ret;
  54
  55         ret = client->startup(substream);
  56         if (!ret)
  57                 goto out;
  58
  59         pxa_free_dma(rtd->dma_ch);
  60  err2:
  61         __pxa2xx_pcm_close(substream);
  62  out:
  63         return ret;
  64 }
  65
  66 static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
  67 {
  68         struct pxa2xx_pcm_client *client = substream->private_data;
  69         struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
  70
  71         pxa_free_dma(rtd->dma_ch);
  72         client->shutdown(substream);
  73
  74         return __pxa2xx_pcm_close(substream);
  75 }
  76
  77 static struct snd_pcm_ops pxa2xx_pcm_ops = {
  78         .open           = pxa2xx_pcm_open,
  79         .close          = pxa2xx_pcm_close,
  80         .ioctl          = snd_pcm_lib_ioctl,
  81         .hw_params      = __pxa2xx_pcm_hw_params,
  82         .hw_free        = __pxa2xx_pcm_hw_free,
  83         .prepare        = pxa2xx_pcm_prepare,
  84         .trigger        = pxa2xx_pcm_trigger,
  85         .pointer        = pxa2xx_pcm_pointer,
  86         .mmap           = pxa2xx_pcm_mmap,
  87 };
  88
  89 int pxa2xx_pcm_new(struct snd_card *card, struct pxa2xx_pcm_client *client,
  90                    struct snd_pcm **rpcm)
  91 {
  92         struct snd_pcm *pcm;
  93         int play = client->playback_params ? 1 : 0;
  94         int capt = client->capture_params ? 1 : 0;
  95         int ret;
  96
  97         ret = snd_pcm_new(card, "PXA2xx-PCM", 0, play, capt, &pcm);
  98         if (ret)
  99                 goto out;
 100
 101         pcm->private_data = client;
 102         pcm->private_free = pxa2xx_pcm_free_dma_buffers;
 103
 104         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 105         if (ret)
 106                 goto out;
 107
 108         if (play) {
 109                 int stream = SNDRV_PCM_STREAM_PLAYBACK;
 110                 snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
 111                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
 112                 if (ret)
 113                         goto out;
 114         }
 115         if (capt) {
 116                 int stream = SNDRV_PCM_STREAM_CAPTURE;
 117                 snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
 118                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
 119                 if (ret)
 120                         goto out;
 121         }
 122
 123         if (rpcm)
 124                 *rpcm = pcm;
 125         ret = 0;
 126
 127  out:
 128         return ret;
 129 }
 130
 131 EXPORT_SYMBOL(pxa2xx_pcm_new);
 132
 133 MODULE_AUTHOR("Nicolas Pitre");
 134 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
 135 MODULE_LICENSE("GPL");