sound/soc/imx/imx-spdif.c

   1 /*
   2  * ASoC S/PDIF driver for IMX development boards
   3  *
   4  * Copyright (C) 2008-2011 Freescale Semiconductor, Inc.
   5  *
   6  * based on stmp3780_devb_spdif.c
   7  *
   8  * Vladimir Barinov <vbarinov@embeddedalley.com>
   9  *
  10  * Copyright 2008 SigmaTel, Inc
  11  * Copyright 2008 Embedded Alley Solutions, Inc
  12  *
  13  * This file is licensed under the terms of the GNU General Public License
  14  * version 2.  This program  is licensed "as is" without any warranty of any
  15  * kind, whether express or implied.
  16  */
  17 #include <linux/module.h>
  18 #include <linux/moduleparam.h>
  19 #include <linux/timer.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/slab.h>
  23
  24 #include <sound/core.h>
  25 #include <sound/pcm.h>
  26 #include <sound/soc.h>
  27 #include <sound/soc-dapm.h>
  28
  29 #include <asm/mach-types.h>
  30 #include <asm/dma.h>
  31 #include <mach/hardware.h>
  32
  33 #include "imx-ssi.h"
  34 #include "../codecs/mxc_spdif.h"
  35
  36 /* imx digital audio interface glue - connects codec <--> CPU */
  37 static struct snd_soc_dai_link imx_spdif_dai_link = {
  38         .name = "IMX SPDIF",
  39         .stream_name = "IMX SPDIF",
  40         .codec_dai_name = "mxc-spdif",
  41         .codec_name = "mxc_spdif.0",
  42         .cpu_dai_name = "imx-spdif-dai.0",
  43         .platform_name = "imx-pcm-audio.2", /* imx-pcm-dma-mx2 */
  44 };
  45
  46 static struct snd_soc_card snd_soc_card_imx_spdif = {
  47         .name = "imx-spdif",
  48         .dai_link = &imx_spdif_dai_link,
  49         .num_links = 1,
  50 };
  51
  52 static int __devinit imx_spdif_audio_probe(struct platform_device *pdev)
  53 {
  54         struct imx_ssi *ssi;
  55         int ret;
  56
  57         ssi = kzalloc(sizeof(*ssi), GFP_KERNEL);
  58         if (!ssi)
  59                 return -ENOMEM;
  60
  61         dev_set_drvdata(&pdev->dev, ssi);
  62
  63         ssi->soc_platform_pdev = platform_device_alloc("imx-pcm-audio", 2);
  64         if (!ssi->soc_platform_pdev) {
  65                 pr_err("%s failed platform_device_alloc\n", __func__);
  66                 return -ENOMEM;
  67         }
  68
  69         /* It may seem weird to be using struct imx_ssi here because S/PDIF
  70            doesn't use ssi.  We only use soc_platform_pdev in struct imx_ssi.
  71            But we need it because imx-pcm-dma-mx2 initializes other fields. */
  72         platform_set_drvdata(ssi->soc_platform_pdev, ssi);
  73
  74         ret = platform_device_add(ssi->soc_platform_pdev);
  75         if (ret) {
  76                 dev_err(&pdev->dev, "failed to add platform device\n");
  77                 platform_device_put(ssi->soc_platform_pdev);
  78                 return ret;
  79         }
  80
  81         return 0;
  82 }
  83
  84 static int __devexit imx_spdif_audio_remove(struct platform_device *pdev)
  85 {
  86         struct imx_ssi *ssi = platform_get_drvdata(pdev);
  87
  88         platform_device_unregister(ssi->soc_platform_pdev);
  89         snd_soc_unregister_dai(&pdev->dev);
  90         kfree(ssi);
  91
  92         return 0;
  93 }
  94
  95 static struct platform_driver imx_spdif_audio_driver = {
  96         .probe = imx_spdif_audio_probe,
  97         .remove = __devexit_p(imx_spdif_audio_remove),
  98         .driver = {
  99                    .name = "imx-spdif-audio-device",
 100                    .owner = THIS_MODULE,
 101                    },
 102 };
 103
 104 static struct platform_device *imx_spdif_snd_device;
 105
 106 static int __init imx_spdif_init(void)
 107 {
 108         int ret = 0;
 109
 110         ret = platform_driver_register(&imx_spdif_audio_driver);
 111         if (ret) {
 112                 pr_err("%s - failed platform_driver_register\n", __func__);
 113                 return -ENOMEM;
 114         }
 115
 116         imx_spdif_snd_device = platform_device_alloc("soc-audio", -1);
 117         if (!imx_spdif_snd_device) {
 118                 pr_err("%s - failed platform_device_alloc\n", __func__);
 119                 return -ENOMEM;
 120         }
 121
 122         platform_set_drvdata(imx_spdif_snd_device, &snd_soc_card_imx_spdif);
 123
 124         ret = platform_device_add(imx_spdif_snd_device);
 125         if (ret) {
 126                 pr_err("ASoC S/PDIF: Platform device allocation failed\n");
 127                 platform_device_put(imx_spdif_snd_device);
 128         }
 129
 130         return ret;
 131 }
 132
 133 static void __exit imx_spdif_exit(void)
 134 {
 135         platform_driver_unregister(&imx_spdif_audio_driver);
 136         platform_device_unregister(imx_spdif_snd_device);
 137 }
 138
 139 module_init(imx_spdif_init);
 140 module_exit(imx_spdif_exit);
 141
 142 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
 143 MODULE_DESCRIPTION("IMX EVK development board ASoC driver");
 144 MODULE_LICENSE("GPL");