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