text: /*
   * 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/control.h>
  #include <plat/dma.h>
  #include <plat/mcbsp.h>
  #include "mcpdm.h"
  #include "omap-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)
  {
  	struct snd_soc_pcm_runtime *rtd = substream->private_data;
  	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
  	int err = 0;
  
  	if (!cpu_dai->active)
  		err = omap_mcpdm_request();
  
  	return err;
  }
  
  static void omap_mcpdm_dai_shutdown(struct snd_pcm_substream *substream,
  				    struct snd_soc_dai *dai)
  {
  	struct snd_soc_pcm_runtime *rtd = substream->private_data;
  	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
  
  	if (!cpu_dai->active)
  		omap_mcpdm_free();
  }
  
  static int omap_mcpdm_dai_trigger(struct snd_pcm_substream *substream, int cmd,
  				  struct snd_soc_dai *dai)
  {
  	struct snd_soc_pcm_runtime *rtd = substream->private_data;
  	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
  	struct omap_mcpdm_data *mcpdm_priv = cpu_dai->private_data;
  	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 snd_soc_pcm_runtime *rtd = substream->private_data;
  	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
  	struct omap_mcpdm_data *mcpdm_priv = cpu_dai->private_data;
  	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(cpu_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 snd_soc_pcm_runtime *rtd = substream->private_data;
  	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
  	struct omap_mcpdm_data *mcpdm_priv = cpu_dai->private_data;
  	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)
  
  struct snd_soc_dai omap_mcpdm_dai = {
  	.name = "omap-mcpdm",
  	.id = -1,
  	.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,
  	.private_data = &mcpdm_data,
  };
  EXPORT_SYMBOL_GPL(omap_mcpdm_dai);
  
  static int __init snd_omap_mcpdm_init(void)
  {
  	return snd_soc_register_dai(&omap_mcpdm_dai);
  }
  module_init(snd_omap_mcpdm_init);
  
  static void __exit snd_omap_mcpdm_exit(void)
  {
  	snd_soc_unregister_dai(&omap_mcpdm_dai);
  }
  module_exit(snd_omap_mcpdm_exit);
  
  MODULE_AUTHOR("Misael Lopez Cruz <x0052729@ti.com>");
  MODULE_DESCRIPTION("OMAP PDM SoC Interface");
  MODULE_LICENSE("GPL");
  