/*
   * Linux driver for TerraTec DMX 6Fire USB
   *
   * Author:	Torsten Schenk <torsten.schenk@zoho.com>
   * Created:	Jan 01, 2011
   * 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
  };
  
  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;
  
  	struct pcm_urb *peer;
  };
  
  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 */
  };
  
  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 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 */