sound/soc/omap/omap4-hdmi-card.c

   1 /*
   2  * omap4-hdmi-card.c
   3  *
   4  * OMAP ALSA SoC machine driver for TI OMAP4 HDMI
   5  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
   6  * Author: Ricardo Neri <ricardo.neri@ti.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  */
  23
  24 #include <linux/module.h>
  25 #include <sound/pcm.h>
  26 #include <sound/soc.h>
  27 #include <asm/mach-types.h>
  28 #include <video/omapdss.h>
  29
  30 #define DRV_NAME "omap4-hdmi-audio"
  31
  32 static int omap4_hdmi_dai_hw_params(struct snd_pcm_substream *substream,
  33                 struct snd_pcm_hw_params *params)
  34 {
  35         int i;
  36         struct omap_overlay_manager *mgr = NULL;
  37         struct device *dev = substream->pcm->card->dev;
  38
  39         /* Find DSS HDMI device */
  40         for (i = 0; i < omap_dss_get_num_overlay_managers(); i++) {
  41                 mgr = omap_dss_get_overlay_manager(i);
  42                 if (mgr && mgr->device
  43                         && mgr->device->type == OMAP_DISPLAY_TYPE_HDMI)
  44                         break;
  45         }
  46
  47         if (i == omap_dss_get_num_overlay_managers()) {
  48                 dev_err(dev, "HDMI display device not found!\n");
  49                 return -ENODEV;
  50         }
  51
  52         /* Make sure HDMI is power-on to avoid L3 interconnect errors */
  53         if (mgr->device->state != OMAP_DSS_DISPLAY_ACTIVE) {
  54                 dev_err(dev, "HDMI display is not active!\n");
  55                 return -EIO;
  56         }
  57
  58         return 0;
  59 }
  60
  61 static struct snd_soc_ops omap4_hdmi_dai_ops = {
  62         .hw_params = omap4_hdmi_dai_hw_params,
  63 };
  64
  65 static struct snd_soc_dai_link omap4_hdmi_dai = {
  66         .name = "HDMI",
  67         .stream_name = "HDMI",
  68         .cpu_dai_name = "hdmi-audio-dai",
  69         .platform_name = "omap-pcm-audio",
  70         .codec_name = "omapdss_hdmi",
  71         .codec_dai_name = "hdmi-audio-codec",
  72         .ops = &omap4_hdmi_dai_ops,
  73 };
  74
  75 static struct snd_soc_card snd_soc_omap4_hdmi = {
  76         .name = "OMAP4HDMI",
  77         .owner = THIS_MODULE,
  78         .dai_link = &omap4_hdmi_dai,
  79         .num_links = 1,
  80 };
  81
  82 static __devinit int omap4_hdmi_probe(struct platform_device *pdev)
  83 {
  84         struct snd_soc_card *card = &snd_soc_omap4_hdmi;
  85         int ret;
  86
  87         card->dev = &pdev->dev;
  88
  89         ret = snd_soc_register_card(card);
  90         if (ret) {
  91                 dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
  92                 card->dev = NULL;
  93                 return ret;
  94         }
  95         return 0;
  96 }
  97
  98 static int __devexit omap4_hdmi_remove(struct platform_device *pdev)
  99 {
 100         struct snd_soc_card *card = platform_get_drvdata(pdev);
 101
 102         snd_soc_unregister_card(card);
 103         card->dev = NULL;
 104         return 0;
 105 }
 106
 107 static struct platform_driver omap4_hdmi_driver = {
 108         .driver = {
 109                 .name = "omap4-hdmi-audio",
 110                 .owner = THIS_MODULE,
 111         },
 112         .probe = omap4_hdmi_probe,
 113         .remove = __devexit_p(omap4_hdmi_remove),
 114 };
 115
 116 module_platform_driver(omap4_hdmi_driver);
 117
 118 MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");
 119 MODULE_DESCRIPTION("OMAP4 HDMI machine ASoC driver");
 120 MODULE_LICENSE("GPL");
 121 MODULE_ALIAS("platform:" DRV_NAME);