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 <sound/pcm.h>
  25 #include <sound/soc.h>
  26 #include <asm/mach-types.h>
  27 #include <video/omapdss.h>
  28
  29 #define DRV_NAME "omap4-hdmi-audio"
  30
  31 static int omap4_hdmi_dai_hw_params(struct snd_pcm_substream *substream,
  32                 struct snd_pcm_hw_params *params)
  33 {
  34         int i;
  35         struct omap_overlay_manager *mgr = NULL;
  36         struct device *dev = substream->pcm->card->dev;
  37
  38         /* Find DSS HDMI device */
  39         for (i = 0; i < omap_dss_get_num_overlay_managers(); i++) {
  40                 mgr = omap_dss_get_overlay_manager(i);
  41                 if (mgr && mgr->device
  42                         && mgr->device->type == OMAP_DISPLAY_TYPE_HDMI)
  43                         break;
  44         }
  45
  46         if (i == omap_dss_get_num_overlay_managers()) {
  47                 dev_err(dev, "HDMI display device not found!\n");
  48                 return -ENODEV;
  49         }
  50
  51         /* Make sure HDMI is power-on to avoid L3 interconnect errors */
  52         if (mgr->device->state != OMAP_DSS_DISPLAY_ACTIVE) {
  53                 dev_err(dev, "HDMI display is not active!\n");
  54                 return -EIO;
  55         }
  56
  57         return 0;
  58 }
  59
  60 static struct snd_soc_ops omap4_hdmi_dai_ops = {
  61         .hw_params = omap4_hdmi_dai_hw_params,
  62 };
  63
  64 static struct snd_soc_dai_link omap4_hdmi_dai = {
  65         .name = "HDMI",
  66         .stream_name = "HDMI",
  67         .cpu_dai_name = "hdmi-audio-dai",
  68         .platform_name = "omap-pcm-audio",
  69         .codec_name = "omapdss_hdmi",
  70         .codec_dai_name = "hdmi-audio-codec",
  71         .ops = &omap4_hdmi_dai_ops,
  72 };
  73
  74 static struct snd_soc_card snd_soc_omap4_hdmi = {
  75         .name = "OMAP4HDMI",
  76         .dai_link = &omap4_hdmi_dai,
  77         .num_links = 1,
  78 };
  79
  80 static __devinit int omap4_hdmi_probe(struct platform_device *pdev)
  81 {
  82         struct snd_soc_card *card = &snd_soc_omap4_hdmi;
  83         int ret;
  84
  85         card->dev = &pdev->dev;
  86
  87         ret = snd_soc_register_card(card);
  88         if (ret) {
  89                 dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
  90                 card->dev = NULL;
  91                 return ret;
  92         }
  93         return 0;
  94 }
  95
  96 static int __devexit omap4_hdmi_remove(struct platform_device *pdev)
  97 {
  98         struct snd_soc_card *card = platform_get_drvdata(pdev);
  99
 100         snd_soc_unregister_card(card);
 101         card->dev = NULL;
 102         return 0;
 103 }
 104
 105 static struct platform_driver omap4_hdmi_driver = {
 106         .driver = {
 107                 .name = "omap4-hdmi-audio",
 108                 .owner = THIS_MODULE,
 109         },
 110         .probe = omap4_hdmi_probe,
 111         .remove = __devexit_p(omap4_hdmi_remove),
 112 };
 113
 114 static int __init omap4_hdmi_init(void)
 115 {
 116         return platform_driver_register(&omap4_hdmi_driver);
 117 }
 118 module_init(omap4_hdmi_init);
 119
 120 static void __exit omap4_hdmi_exit(void)
 121 {
 122         platform_driver_unregister(&omap4_hdmi_driver);
 123 }
 124 module_exit(omap4_hdmi_exit);
 125
 126 MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");
 127 MODULE_DESCRIPTION("OMAP4 HDMI machine ASoC driver");
 128 MODULE_LICENSE("GPL");
 129 MODULE_ALIAS("platform:" DRV_NAME);