LXR linux/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
  40static struct omap_pcm_dma_data omap_hdmi_dai_dma_params = {
  41        .name = "HDMI playback",
  42        .sync_mode = OMAP_DMA_SYNC_PACKET,
  43};
  44
  45static 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
  61static 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
  86static 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
  91static 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
 101static __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
 127static int __devexit omap_hdmi_remove(struct platform_device *pdev)
 128{
 129        snd_soc_unregister_dai(&pdev->dev);
 130        return 0;
 131}
 132
 133static 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
 142module_platform_driver(hdmi_dai_driver);
 143
 144MODULE_AUTHOR("Jorge Candelaria <jorge.candelaria@ti.com>");
 145MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");
 146MODULE_DESCRIPTION("OMAP HDMI SoC Interface");
 147MODULE_LICENSE("GPL");
 148MODULE_ALIAS("platform:" DRV_NAME);
 149