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 <sound/core.h>
  15 #include <sound/pxa2xx-lib.h>
  16
  17 #include "pxa2xx-pcm.h"
  18
  19 static 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
  28 static 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
  60 static 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
  71 static 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
  83 static u64 pxa2xx_pcm_dmamask = 0xffffffff;
  84
  85 int 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
 128 EXPORT_SYMBOL(pxa2xx_pcm_new);
 129
 130 MODULE_AUTHOR("Nicolas Pitre");
 131 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
 132 MODULE_LICENSE("GPL");