LXR linux/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
  18static 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
  27static 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
  59static 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
  70static 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
  82static u64 pxa2xx_pcm_dmamask = 0xffffffff;
  83
  84int 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
 127EXPORT_SYMBOL(pxa2xx_pcm_new);
 128
 129MODULE_AUTHOR("Nicolas Pitre");
 130MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
 131MODULE_LICENSE("GPL");
 132