sound/usb/6fire/pcm.h

   1 /*
   2  * Linux driver for TerraTec DMX 6Fire USB
   3  *
   4  * Author:      Torsten Schenk <torsten.schenk@zoho.com>
   5  * Created:     Jan 01, 2011
   6  * Version:     0.3.0
   7  * Copyright:   (C) Torsten Schenk
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  */
  14
  15 #ifndef USB6FIRE_PCM_H
  16 #define USB6FIRE_PCM_H
  17
  18 #include <sound/pcm.h>
  19 #include <linux/mutex.h>
  20
  21 #include "common.h"
  22
  23 enum /* settings for pcm */
  24 {
  25         /* maximum of EP_W_MAX_PACKET_SIZE[] (see firmware.c) */
  26         PCM_N_URBS = 16, PCM_N_PACKETS_PER_URB = 8, PCM_MAX_PACKET_SIZE = 604
  27 };
  28
  29 struct pcm_urb {
  30         struct sfire_chip *chip;
  31
  32         /* BEGIN DO NOT SEPARATE */
  33         struct urb instance;
  34         struct usb_iso_packet_descriptor packets[PCM_N_PACKETS_PER_URB];
  35         /* END DO NOT SEPARATE */
  36         u8 buffer[PCM_N_PACKETS_PER_URB * PCM_MAX_PACKET_SIZE];
  37
  38         struct pcm_urb *peer;
  39 };
  40
  41 struct pcm_substream {
  42         spinlock_t lock;
  43         struct snd_pcm_substream *instance;
  44
  45         bool active;
  46
  47         snd_pcm_uframes_t dma_off; /* current position in alsa dma_area */
  48         snd_pcm_uframes_t period_off; /* current position in current period */
  49 };
  50
  51 struct pcm_runtime {
  52         struct sfire_chip *chip;
  53         struct snd_pcm *instance;
  54
  55         struct pcm_substream playback;
  56         struct pcm_substream capture;
  57         bool panic; /* if set driver won't do anymore pcm on device */
  58
  59         struct pcm_urb in_urbs[PCM_N_URBS];
  60         struct pcm_urb out_urbs[PCM_N_URBS];
  61         int in_packet_size;
  62         int out_packet_size;
  63         int in_n_analog; /* number of analog channels soundcard sends */
  64         int out_n_analog; /* number of analog channels soundcard receives */
  65
  66         struct mutex stream_mutex;
  67         u8 stream_state; /* one of STREAM_XXX (pcm.c) */
  68         u8 rate; /* one of PCM_RATE_XXX */
  69         wait_queue_head_t stream_wait_queue;
  70         bool stream_wait_cond;
  71 };
  72
  73 int __devinit usb6fire_pcm_init(struct sfire_chip *chip);
  74 void usb6fire_pcm_abort(struct sfire_chip *chip);
  75 void usb6fire_pcm_destroy(struct sfire_chip *chip);
  76 #endif /* USB6FIRE_PCM_H */