1. 根目录:
2. sound
3. soc
4. omap
5. omap-mcpdm.c

/*
 * omap-mcpdm.c  --  OMAP ALSA SoC DAI driver using McPDM port
 *
 * Copyright (C) 2009 Texas Instruments
 *
 * Author: Misael Lopez Cruz <x0052729@ti.com>
 * Contact: Jorge Eduardo Candelaria <x0107209@ti.com>
 *          Margarita Olaya <magi.olaya@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 <plat/mcbsp.h>
#include "mcpdm.h"
#include "omap-pcm.h"

struct omap_mcpdm_data {
	struct omap_mcpdm_link *links;
	int active;
};

static struct omap_mcpdm_link omap_mcpdm_links[] = {
	/* downlink */
	{
		.irq_mask = MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL,
		.threshold = 1,
		.format = PDMOUTFORMAT_LJUST,
	},
	/* uplink */
	{
		.irq_mask = MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL,
		.threshold = 1,
		.format = PDMOUTFORMAT_LJUST,
	},
};

static struct omap_mcpdm_data mcpdm_data = {
	.links = omap_mcpdm_links,
	.active = 0,
};

/*
 * Stream DMA parameters
 */
static struct omap_pcm_dma_data omap_mcpdm_dai_dma_params[] = {
	{
		.name = "Audio playback",
		.dma_req = OMAP44XX_DMA_MCPDM_DL,
		.data_type = OMAP_DMA_DATA_TYPE_S32,
		.sync_mode = OMAP_DMA_SYNC_PACKET,
		.packet_size = 16,
		.port_addr = OMAP44XX_MCPDM_L3_BASE + MCPDM_DN_DATA,
	},
	{
		.name = "Audio capture",
		.dma_req = OMAP44XX_DMA_MCPDM_UP,
		.data_type = OMAP_DMA_DATA_TYPE_S32,
		.sync_mode = OMAP_DMA_SYNC_PACKET,
		.packet_size = 16,
		.port_addr = OMAP44XX_MCPDM_L3_BASE + MCPDM_UP_DATA,
	},
};

static int omap_mcpdm_dai_startup(struct snd_pcm_substream *substream,
				  struct snd_soc_dai *dai)
{
	int err = 0;

	if (!dai->active)
		err = omap_mcpdm_request();

	return err;
}

static void omap_mcpdm_dai_shutdown(struct snd_pcm_substream *substream,
				    struct snd_soc_dai *dai)
{
	if (!dai->active)
		omap_mcpdm_free();
}

static int omap_mcpdm_dai_trigger(struct snd_pcm_substream *substream, int cmd,
				  struct snd_soc_dai *dai)
{
	struct omap_mcpdm_data *mcpdm_priv = snd_soc_dai_get_drvdata(dai);
	int stream = substream->stream;
	int err = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		if (!mcpdm_priv->active++)
			omap_mcpdm_start(stream);
		break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		if (!--mcpdm_priv->active)
			omap_mcpdm_stop(stream);
		break;
	default:
		err = -EINVAL;
	}

	return err;
}

static int omap_mcpdm_dai_hw_params(struct snd_pcm_substream *substream,
				    struct snd_pcm_hw_params *params,
				    struct snd_soc_dai *dai)
{
	struct omap_mcpdm_data *mcpdm_priv = snd_soc_dai_get_drvdata(dai);
	struct omap_mcpdm_link *mcpdm_links = mcpdm_priv->links;
	int stream = substream->stream;
	int channels, err, link_mask = 0;

	snd_soc_dai_set_dma_data(dai, substream,
				 &omap_mcpdm_dai_dma_params[stream]);

	channels = params_channels(params);
	switch (channels) {
	case 4:
		if (stream == SNDRV_PCM_STREAM_CAPTURE)
			/* up to 2 channels for capture */
			return -EINVAL;
		link_mask |= 1 << 3;
	case 3:
		if (stream == SNDRV_PCM_STREAM_CAPTURE)
			/* up to 2 channels for capture */
			return -EINVAL;
		link_mask |= 1 << 2;
	case 2:
		link_mask |= 1 << 1;
	case 1:
		link_mask |= 1 << 0;
		break;
	default:
		/* unsupported number of channels */
		return -EINVAL;
	}

	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
		mcpdm_links[stream].channels = link_mask << 3;
		err = omap_mcpdm_playback_open(&mcpdm_links[stream]);
	} else {
		mcpdm_links[stream].channels = link_mask << 0;
		err = omap_mcpdm_capture_open(&mcpdm_links[stream]);
	}

	return err;
}

static int omap_mcpdm_dai_hw_free(struct snd_pcm_substream *substream,
				  struct snd_soc_dai *dai)
{
	struct omap_mcpdm_data *mcpdm_priv = snd_soc_dai_get_drvdata(dai);
	struct omap_mcpdm_link *mcpdm_links = mcpdm_priv->links;
	int stream = substream->stream;
	int err;

	if (substream->stream ==  SNDRV_PCM_STREAM_PLAYBACK)
		err = omap_mcpdm_playback_close(&mcpdm_links[stream]);
	else
		err = omap_mcpdm_capture_close(&mcpdm_links[stream]);

	return err;
}

static struct snd_soc_dai_ops omap_mcpdm_dai_ops = {
	.startup	= omap_mcpdm_dai_startup,
	.shutdown	= omap_mcpdm_dai_shutdown,
	.trigger	= omap_mcpdm_dai_trigger,
	.hw_params	= omap_mcpdm_dai_hw_params,
	.hw_free	= omap_mcpdm_dai_hw_free,
};

#define OMAP_MCPDM_RATES	(SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
#define OMAP_MCPDM_FORMATS	(SNDRV_PCM_FMTBIT_S32_LE)

static int omap_mcpdm_dai_probe(struct snd_soc_dai *dai)
{
	snd_soc_dai_set_drvdata(dai, &mcpdm_data);
	return 0;
}

static struct snd_soc_dai_driver omap_mcpdm_dai = {
	.probe = omap_mcpdm_dai_probe,
	.playback = {
		.channels_min = 1,
		.channels_max = 4,
		.rates = OMAP_MCPDM_RATES,
		.formats = OMAP_MCPDM_FORMATS,
	},
	.capture = {
		.channels_min = 1,
		.channels_max = 2,
		.rates = OMAP_MCPDM_RATES,
		.formats = OMAP_MCPDM_FORMATS,
	},
	.ops = &omap_mcpdm_dai_ops,
};

static __devinit int asoc_mcpdm_probe(struct platform_device *pdev)
{
	int ret;

	ret = omap_mcpdm_probe(pdev);
	if (ret < 0)
		return ret;
	ret = snd_soc_register_dai(&pdev->dev, &omap_mcpdm_dai);
	if (ret < 0)
		omap_mcpdm_remove(pdev);
	return ret;
}

static int __devexit asoc_mcpdm_remove(struct platform_device *pdev)
{
	snd_soc_unregister_dai(&pdev->dev);
	omap_mcpdm_remove(pdev);
	return 0;
}

static struct platform_driver asoc_mcpdm_driver = {
	.driver = {
			.name = "omap-mcpdm-dai",
			.owner = THIS_MODULE,
	},

	.probe = asoc_mcpdm_probe,
	.remove = __devexit_p(asoc_mcpdm_remove),
};

static int __init snd_omap_mcpdm_init(void)
{
	return platform_driver_register(&asoc_mcpdm_driver);
}
module_init(snd_omap_mcpdm_init);

static void __exit snd_omap_mcpdm_exit(void)
{
	platform_driver_unregister(&asoc_mcpdm_driver);
}
module_exit(snd_omap_mcpdm_exit);

MODULE_AUTHOR("Misael Lopez Cruz <x0052729@ti.com>");
MODULE_DESCRIPTION("OMAP PDM SoC Interface");
MODULE_LICENSE("GPL");