release/src-rt-6.x.4708/linux/linux-2.6.36/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 <sound/core.h>
  14 #include <sound/pxa2xx-lib.h>
  15
  16 #include "pxa2xx-pcm.h"
  17
  18 static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
  19 {
  20         struct pxa2xx_pcm_client *client = substream->private_data;
  21
  22         __pxa2xx_pcm_prepare(substream);
  23
  24         return client->prepare(substream);
  25 }
  26
  27 static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
  28 {
  29         struct pxa2xx_pcm_client *client = substream->private_data;
  30         struct snd_pcm_runtime *runtime = substream->runtime;
  31         struct pxa2xx_runtime_data *rtd;
  32         int ret;
  33
  34         ret = __pxa2xx_pcm_open(substream);
  35         if (ret)
  36                 goto out;
  37
  38         rtd = runtime->private_data;
  39
  40         rtd->params = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  41                       client->playback_params : client->capture_params;
  42         ret = pxa_request_dma(rtd->params->name, DMA_PRIO_LOW,
  43                               pxa2xx_pcm_dma_irq, substream);
  44         if (ret < 0)
  45                 goto err2;
  46         rtd->dma_ch = ret;
  47
  48         ret = client->startup(substream);
  49         if (!ret)
  50                 goto out;
  51
  52         pxa_free_dma(rtd->dma_ch);
  53  err2:
  54         __pxa2xx_pcm_close(substream);
  55  out:
  56         return ret;
  57 }
  58
  59 static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
  60 {
  61         struct pxa2xx_pcm_client *client = substream->private_data;
  62         struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
  63
  64         pxa_free_dma(rtd->dma_ch);
  65         client->shutdown(substream);
  66
  67         return __pxa2xx_pcm_close(substream);
  68 }
  69
  70 static struct snd_pcm_ops pxa2xx_pcm_ops = {
  71         .open           = pxa2xx_pcm_open,
  72         .close          = pxa2xx_pcm_close,
  73         .ioctl          = snd_pcm_lib_ioctl,
  74         .hw_params      = __pxa2xx_pcm_hw_params,
  75         .hw_free        = __pxa2xx_pcm_hw_free,
  76         .prepare        = pxa2xx_pcm_prepare,
  77         .trigger        = pxa2xx_pcm_trigger,
  78         .pointer        = pxa2xx_pcm_pointer,
  79         .mmap           = pxa2xx_pcm_mmap,
  80 };
  81
  82 static u64 pxa2xx_pcm_dmamask = 0xffffffff;
  83
  84 int pxa2xx_pcm_new(struct snd_card *card, struct pxa2xx_pcm_client *client,
  85                    struct snd_pcm **rpcm)
  86 {
  87         struct snd_pcm *pcm;
  88         int play = client->playback_params ? 1 : 0;
  89         int capt = client->capture_params ? 1 : 0;
  90         int ret;
  91
  92         ret = snd_pcm_new(card, "PXA2xx-PCM", 0, play, capt, &pcm);
  93         if (ret)
  94                 goto out;
  95
  96         pcm->private_data = client;
  97         pcm->private_free = pxa2xx_pcm_free_dma_buffers;
  98
  99         if (!card->dev->dma_mask)
 100                 card->dev->dma_mask = &pxa2xx_pcm_dmamask;
 101         if (!card->dev->coherent_dma_mask)
 102                 card->dev->coherent_dma_mask = 0xffffffff;
 103
 104         if (play) {
 105                 int stream = SNDRV_PCM_STREAM_PLAYBACK;
 106                 snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
 107                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
 108                 if (ret)
 109                         goto out;
 110         }
 111         if (capt) {
 112                 int stream = SNDRV_PCM_STREAM_CAPTURE;
 113                 snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
 114                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
 115                 if (ret)
 116                         goto out;
 117         }
 118
 119         if (rpcm)
 120                 *rpcm = pcm;
 121         ret = 0;
 122
 123  out:
 124         return ret;
 125 }
 126
 127 EXPORT_SYMBOL(pxa2xx_pcm_new);
 128
 129 MODULE_AUTHOR("Nicolas Pitre");
 130 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
 131 MODULE_LICENSE("GPL");