sound/soc/omap/omap-hdmi.c

   1 /*
   2  * omap-hdmi.c
   3  *
   4  * OMAP ALSA SoC DAI driver for HDMI audio on OMAP4 processors.
   5  * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com/
   6  * Authors: Jorge Candelaria <jorge.candelaria@ti.com>
   7  *          Ricardo Neri <ricardo.neri@ti.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * version 2 as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  21  * 02110-1301 USA
  22  *
  23  */
  24
  25 #include <linux/init.h>
  26 #include <linux/module.h>
  27 #include <linux/device.h>
  28 #include <sound/core.h>
  29 #include <sound/pcm.h>
  30 #include <sound/pcm_params.h>
  31 #include <sound/initval.h>
  32 #include <sound/soc.h>
  33
  34 #include <plat/dma.h>
  35 #include "omap-pcm.h"
  36 #include "omap-hdmi.h"
  37
  38 #define DRV_NAME "hdmi-audio-dai"
  39
  40 static struct omap_pcm_dma_data omap_hdmi_dai_dma_params = {
  41         .name = "HDMI playback",
  42         .sync_mode = OMAP_DMA_SYNC_PACKET,
  43 };
  44
  45 static int omap_hdmi_dai_startup(struct snd_pcm_substream *substream,
  46                                   struct snd_soc_dai *dai)
  47 {
  48         int err;
  49         /*
  50          * Make sure that the period bytes are multiple of the DMA packet size.
  51          * Largest packet size we use is 32 32-bit words = 128 bytes
  52          */
  53         err = snd_pcm_hw_constraint_step(substream->runtime, 0,
  54                                  SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
  55         if (err < 0)
  56                 return err;
  57
  58         return 0;
  59 }
  60
  61 static int omap_hdmi_dai_hw_params(struct snd_pcm_substream *substream,
  62                                     struct snd_pcm_hw_params *params,
  63                                     struct snd_soc_dai *dai)
  64 {
  65         int err = 0;
  66
  67         switch (params_format(params)) {
  68         case SNDRV_PCM_FORMAT_S16_LE:
  69                 omap_hdmi_dai_dma_params.packet_size = 16;
  70                 break;
  71         case SNDRV_PCM_FORMAT_S24_LE:
  72                 omap_hdmi_dai_dma_params.packet_size = 32;
  73                 break;
  74         default:
  75                 err = -EINVAL;
  76         }
  77
  78         omap_hdmi_dai_dma_params.data_type = OMAP_DMA_DATA_TYPE_S32;
  79
  80         snd_soc_dai_set_dma_data(dai, substream,
  81                                  &omap_hdmi_dai_dma_params);
  82
  83         return err;
  84 }
  85
  86 static const struct snd_soc_dai_ops omap_hdmi_dai_ops = {
  87         .startup        = omap_hdmi_dai_startup,
  88         .hw_params      = omap_hdmi_dai_hw_params,
  89 };
  90
  91 static struct snd_soc_dai_driver omap_hdmi_dai = {
  92         .playback = {
  93                 .channels_min = 2,
  94                 .channels_max = 2,
  95                 .rates = OMAP_HDMI_RATES,
  96                 .formats = OMAP_HDMI_FORMATS,
  97         },
  98         .ops = &omap_hdmi_dai_ops,
  99 };
 100
 101 static __devinit int omap_hdmi_probe(struct platform_device *pdev)
 102 {
 103         int ret;
 104         struct resource *hdmi_rsrc;
 105
 106         hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 107         if (!hdmi_rsrc) {
 108                 dev_err(&pdev->dev, "Cannot obtain IORESOURCE_MEM HDMI\n");
 109                 return -EINVAL;
 110         }
 111
 112         omap_hdmi_dai_dma_params.port_addr =  hdmi_rsrc->start
 113                 + OMAP_HDMI_AUDIO_DMA_PORT;
 114
 115         hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 116         if (!hdmi_rsrc) {
 117                 dev_err(&pdev->dev, "Cannot obtain IORESOURCE_DMA HDMI\n");
 118                 return -EINVAL;
 119         }
 120
 121         omap_hdmi_dai_dma_params.dma_req =  hdmi_rsrc->start;
 122
 123         ret = snd_soc_register_dai(&pdev->dev, &omap_hdmi_dai);
 124         return ret;
 125 }
 126
 127 static int __devexit omap_hdmi_remove(struct platform_device *pdev)
 128 {
 129         snd_soc_unregister_dai(&pdev->dev);
 130         return 0;
 131 }
 132
 133 static struct platform_driver hdmi_dai_driver = {
 134         .driver = {
 135                 .name = DRV_NAME,
 136                 .owner = THIS_MODULE,
 137         },
 138         .probe = omap_hdmi_probe,
 139         .remove = __devexit_p(omap_hdmi_remove),
 140 };
 141
 142 module_platform_driver(hdmi_dai_driver);
 143
 144 MODULE_AUTHOR("Jorge Candelaria <jorge.candelaria@ti.com>");
 145 MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");
 146 MODULE_DESCRIPTION("OMAP HDMI SoC Interface");
 147 MODULE_LICENSE("GPL");
 148 MODULE_ALIAS("platform:" DRV_NAME);