LXR linux/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
  22enum /* 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
  28struct 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
  40struct 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
  50struct 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
  72int usb6fire_pcm_init(struct sfire_chip *chip);
  73void usb6fire_pcm_abort(struct sfire_chip *chip);
  74void usb6fire_pcm_destroy(struct sfire_chip *chip);
  75#endif /* USB6FIRE_PCM_H */
  76