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