Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

Linux/sound/soc/pxa/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/dma-mapping.h>
 14 #include <linux/module.h>
 15 #include <linux/dmaengine.h>
 16 #include <linux/of.h>
 17 
 18 #include <sound/core.h>
 19 #include <sound/soc.h>
 20 #include <sound/pxa2xx-lib.h>
 21 #include <sound/dmaengine_pcm.h>
 22 
 23 #include "../../arm/pxa2xx-pcm.h"
 24 
 25 static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
 26         struct snd_pcm_hw_params *params)
 27 {
 28         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 29         struct snd_dmaengine_dai_dma_data *dma;
 30 
 31         dma = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 32 
 33         /* return if this is a bufferless transfer e.g.
 34          * codec <--> BT codec or GSM modem -- lg FIXME */
 35         if (!dma)
 36                 return 0;
 37 
 38         return __pxa2xx_pcm_hw_params(substream, params);
 39 }
 40 
 41 static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
 42 {
 43         __pxa2xx_pcm_hw_free(substream);
 44 
 45         return 0;
 46 }
 47 
 48 static struct snd_pcm_ops pxa2xx_pcm_ops = {
 49         .open           = __pxa2xx_pcm_open,
 50         .close          = __pxa2xx_pcm_close,
 51         .ioctl          = snd_pcm_lib_ioctl,
 52         .hw_params      = pxa2xx_pcm_hw_params,
 53         .hw_free        = pxa2xx_pcm_hw_free,
 54         .prepare        = __pxa2xx_pcm_prepare,
 55         .trigger        = pxa2xx_pcm_trigger,
 56         .pointer        = pxa2xx_pcm_pointer,
 57         .mmap           = pxa2xx_pcm_mmap,
 58 };
 59 
 60 static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd)
 61 {
 62         struct snd_card *card = rtd->card->snd_card;
 63         struct snd_pcm *pcm = rtd->pcm;
 64         int ret;
 65 
 66         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 67         if (ret)
 68                 return ret;
 69 
 70         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 71                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
 72                         SNDRV_PCM_STREAM_PLAYBACK);
 73                 if (ret)
 74                         goto out;
 75         }
 76 
 77         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 78                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
 79                         SNDRV_PCM_STREAM_CAPTURE);
 80                 if (ret)
 81                         goto out;
 82         }
 83  out:
 84         return ret;
 85 }
 86 
 87 static struct snd_soc_platform_driver pxa2xx_soc_platform = {
 88         .ops    = &pxa2xx_pcm_ops,
 89         .pcm_new        = pxa2xx_soc_pcm_new,
 90         .pcm_free       = pxa2xx_pcm_free_dma_buffers,
 91 };
 92 
 93 static int pxa2xx_soc_platform_probe(struct platform_device *pdev)
 94 {
 95         return devm_snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform);
 96 }
 97 
 98 #ifdef CONFIG_OF
 99 static const struct of_device_id snd_soc_pxa_audio_match[] = {
100         { .compatible   = "mrvl,pxa-pcm-audio" },
101         { }
102 };
103 MODULE_DEVICE_TABLE(of, snd_soc_pxa_audio_match);
104 #endif
105 
106 static struct platform_driver pxa_pcm_driver = {
107         .driver = {
108                 .name = "pxa-pcm-audio",
109                 .of_match_table = of_match_ptr(snd_soc_pxa_audio_match),
110         },
111 
112         .probe = pxa2xx_soc_platform_probe,
113 };
114 
115 module_platform_driver(pxa_pcm_driver);
116 
117 MODULE_AUTHOR("Nicolas Pitre");
118 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
119 MODULE_LICENSE("GPL");
120 MODULE_ALIAS("platform:pxa-pcm-audio");
121 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us