1 files changed, 158 insertions, 0 deletions

diff --git a/sound/soc/omap/omap-hdmi.c b/sound/soc/omap/omap-hdmi.c
new file mode 100644
index 00000000000..36c6eaeffb0
--- /dev/null
+++ b/sound/soc/omap/omap-hdmi.c
@@ -0,0 +1,158 @@
+/*
+ * omap-hdmi.c
+ *
+ * OMAP ALSA SoC DAI driver for HDMI audio on OMAP4 processors.
+ * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com/
+ * Authors: Jorge Candelaria <jorge.candelaria@ti.com>
+ *          Ricardo Neri <ricardo.neri@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#include <plat/dma.h>
+#include "omap-pcm.h"
+#include "omap-hdmi.h"
+
+#define DRV_NAME "hdmi-audio-dai"
+
+static struct omap_pcm_dma_data omap_hdmi_dai_dma_params = {
+        .name = "HDMI playback",
+        .sync_mode = OMAP_DMA_SYNC_PACKET,
+};
+
+static int omap_hdmi_dai_startup(struct snd_pcm_substream *substream,
+                                  struct snd_soc_dai *dai)
+{
+        int err;
+        /*
+         * Make sure that the period bytes are multiple of the DMA packet size.
+         * Largest packet size we use is 32 32-bit words = 128 bytes
+         */
+        err = snd_pcm_hw_constraint_step(substream->runtime, 0,
+                                 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
+        if (err < 0)
+                return err;
+
+        return 0;
+}
+
+static int omap_hdmi_dai_hw_params(struct snd_pcm_substream *substream,
+                                    struct snd_pcm_hw_params *params,
+                                    struct snd_soc_dai *dai)
+{
+        int err = 0;
+
+        switch (params_format(params)) {
+        case SNDRV_PCM_FORMAT_S16_LE:
+                omap_hdmi_dai_dma_params.packet_size = 16;
+                break;
+        case SNDRV_PCM_FORMAT_S24_LE:
+                omap_hdmi_dai_dma_params.packet_size = 32;
+                break;
+        default:
+                err = -EINVAL;
+        }
+
+        omap_hdmi_dai_dma_params.data_type = OMAP_DMA_DATA_TYPE_S32;
+
+        snd_soc_dai_set_dma_data(dai, substream,
+                                 &omap_hdmi_dai_dma_params);
+
+        return err;
+}
+
+static struct snd_soc_dai_ops omap_hdmi_dai_ops = {
+        .startup        = omap_hdmi_dai_startup,
+        .hw_params      = omap_hdmi_dai_hw_params,
+};
+
+static struct snd_soc_dai_driver omap_hdmi_dai = {
+        .playback = {
+                .channels_min = 2,
+                .channels_max = 2,
+                .rates = OMAP_HDMI_RATES,
+                .formats = OMAP_HDMI_FORMATS,
+        },
+        .ops = &omap_hdmi_dai_ops,
+};
+
+static __devinit int omap_hdmi_probe(struct platform_device *pdev)
+{
+        int ret;
+        struct resource *hdmi_rsrc;
+
+        hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!hdmi_rsrc) {
+                dev_err(&pdev->dev, "Cannot obtain IORESOURCE_MEM HDMI\n");
+                return -EINVAL;
+        }
+
+        omap_hdmi_dai_dma_params.port_addr =  hdmi_rsrc->start
+                + OMAP_HDMI_AUDIO_DMA_PORT;
+
+        hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+        if (!hdmi_rsrc) {
+                dev_err(&pdev->dev, "Cannot obtain IORESOURCE_DMA HDMI\n");
+                return -EINVAL;
+        }
+
+        omap_hdmi_dai_dma_params.dma_req =  hdmi_rsrc->start;
+
+        ret = snd_soc_register_dai(&pdev->dev, &omap_hdmi_dai);
+        return ret;
+}
+
+static int __devexit omap_hdmi_remove(struct platform_device *pdev)
+{
+        snd_soc_unregister_dai(&pdev->dev);
+        return 0;
+}
+
+static struct platform_driver hdmi_dai_driver = {
+        .driver = {
+                .name = DRV_NAME,
+                .owner = THIS_MODULE,
+        },
+        .probe = omap_hdmi_probe,
+        .remove = __devexit_p(omap_hdmi_remove),
+};
+
+static int __init hdmi_dai_init(void)
+{
+        return platform_driver_register(&hdmi_dai_driver);
+}
+module_init(hdmi_dai_init);
+
+static void __exit hdmi_dai_exit(void)
+{
+        platform_driver_unregister(&hdmi_dai_driver);
+}
+module_exit(hdmi_dai_exit);
+
+MODULE_AUTHOR("Jorge Candelaria <jorge.candelaria@ti.com>");
+MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");
+MODULE_DESCRIPTION("OMAP HDMI SoC Interface");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);