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pcm.h

/*
 * Linux driver for TerraTec DMX 6Fire USB
 *
 * Author:  Torsten Schenk <torsten.schenk@zoho.com>
 * Created: Jan 01, 2011
 * Version: 0.3.0
 * Copyright:     (C) Torsten Schenk
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#ifndef USB6FIRE_PCM_H
#define USB6FIRE_PCM_H

#include <sound/pcm.h>
#include <linux/mutex.h>

#include "common.h"

enum /* settings for pcm */
{
      /* maximum of EP_W_MAX_PACKET_SIZE[] (see firmware.c) */
      PCM_N_URBS = 16, PCM_N_PACKETS_PER_URB = 8, PCM_MAX_PACKET_SIZE = 604
};

00029 struct pcm_urb {
      struct sfire_chip *chip;

      /* BEGIN DO NOT SEPARATE */
      struct urb instance;
      struct usb_iso_packet_descriptor packets[PCM_N_PACKETS_PER_URB];
      /* END DO NOT SEPARATE */
      u8 buffer[PCM_N_PACKETS_PER_URB * PCM_MAX_PACKET_SIZE];

      struct pcm_urb *peer;
};

00041 struct pcm_substream {
      spinlock_t lock;
      struct snd_pcm_substream *instance;

      bool active;

      snd_pcm_uframes_t dma_off; /* current position in alsa dma_area */
      snd_pcm_uframes_t period_off; /* current position in current period */
};

00051 struct pcm_runtime {
      struct sfire_chip *chip;
      struct snd_pcm *instance;

      struct pcm_substream playback;
      struct pcm_substream capture;
      bool panic; /* if set driver won't do anymore pcm on device */

      struct pcm_urb in_urbs[PCM_N_URBS];
      struct pcm_urb out_urbs[PCM_N_URBS];
      int in_packet_size;
      int out_packet_size;
      int in_n_analog; /* number of analog channels soundcard sends */
      int out_n_analog; /* number of analog channels soundcard receives */

      struct mutex stream_mutex;
      u8 stream_state; /* one of STREAM_XXX (pcm.c) */
      u8 rate; /* one of PCM_RATE_XXX */
      wait_queue_head_t stream_wait_queue;
      bool stream_wait_cond;
};

int __devinit usb6fire_pcm_init(struct sfire_chip *chip);
void usb6fire_pcm_abort(struct sfire_chip *chip);
void usb6fire_pcm_destroy(struct sfire_chip *chip);
#endif /* USB6FIRE_PCM_H */

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