LXR linux/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
  32static 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
  61static struct snd_soc_ops omap4_hdmi_dai_ops = {
  62        .hw_params = omap4_hdmi_dai_hw_params,
  63};
  64
  65static 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
  75static 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
  82static __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
  98static 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
 107static 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
 116module_platform_driver(omap4_hdmi_driver);
 117
 118MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");
 119MODULE_DESCRIPTION("OMAP4 HDMI machine ASoC driver");
 120MODULE_LICENSE("GPL");
 121MODULE_ALIAS("platform:" DRV_NAME);
 122