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/dmaengine.h>
  15
  16 #include <sound/core.h>
  17 #include <sound/pxa2xx-lib.h>
  18 #include <sound/dmaengine_pcm.h>
  19
  20 #include "pxa2xx-pcm.h"
  21
  22 static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
  23 {
  24         struct pxa2xx_pcm_client *client = substream->private_data;
  25
  26         __pxa2xx_pcm_prepare(substream);
  27
  28         return client->prepare(substream);
  29 }
  30
  31 static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
  32 {
  33         struct pxa2xx_pcm_client *client = substream->private_data;
  34         struct snd_pcm_runtime *runtime = substream->runtime;
  35         struct pxa2xx_runtime_data *rtd;
  36         int ret;
  37
  38         ret = __pxa2xx_pcm_open(substream);
  39         if (ret)
  40                 goto out;
  41
  42         rtd = runtime->private_data;
  43
  44         rtd->params = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  45                       client->playback_params : client->capture_params;
  46         ret = pxa_request_dma("dma", DMA_PRIO_LOW,
  47                               pxa2xx_pcm_dma_irq, substream);
  48         if (ret < 0)
  49                 goto err2;
  50         rtd->dma_ch = ret;
  51
  52         ret = client->startup(substream);
  53         if (!ret)
  54                 goto out;
  55
  56         pxa_free_dma(rtd->dma_ch);
  57  err2:
  58         __pxa2xx_pcm_close(substream);
  59  out:
  60         return ret;
  61 }
  62
  63 static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
  64 {
  65         struct pxa2xx_pcm_client *client = substream->private_data;
  66         struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
  67
  68         pxa_free_dma(rtd->dma_ch);
  69         client->shutdown(substream);
  70
  71         return __pxa2xx_pcm_close(substream);
  72 }
  73
  74 static struct snd_pcm_ops pxa2xx_pcm_ops = {
  75         .open           = pxa2xx_pcm_open,
  76         .close          = pxa2xx_pcm_close,
  77         .ioctl          = snd_pcm_lib_ioctl,
  78         .hw_params      = __pxa2xx_pcm_hw_params,
  79         .hw_free        = __pxa2xx_pcm_hw_free,
  80         .prepare        = pxa2xx_pcm_prepare,
  81         .trigger        = pxa2xx_pcm_trigger,
  82         .pointer        = pxa2xx_pcm_pointer,
  83         .mmap           = pxa2xx_pcm_mmap,
  84 };
  85
  86 static u64 pxa2xx_pcm_dmamask = 0xffffffff;
  87
  88 int pxa2xx_pcm_new(struct snd_card *card, struct pxa2xx_pcm_client *client,
  89                    struct snd_pcm **rpcm)
  90 {
  91         struct snd_pcm *pcm;
  92         int play = client->playback_params ? 1 : 0;
  93         int capt = client->capture_params ? 1 : 0;
  94         int ret;
  95
  96         ret = snd_pcm_new(card, "PXA2xx-PCM", 0, play, capt, &pcm);
  97         if (ret)
  98                 goto out;
  99
 100         pcm->private_data = client;
 101         pcm->private_free = pxa2xx_pcm_free_dma_buffers;
 102
 103         if (!card->dev->dma_mask)
 104                 card->dev->dma_mask = &pxa2xx_pcm_dmamask;
 105         if (!card->dev->coherent_dma_mask)
 106                 card->dev->coherent_dma_mask = 0xffffffff;
 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");