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 * 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
  23enum /* 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
  29struct 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
  41struct 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
  51struct 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
  73int __devinit usb6fire_pcm_init(struct sfire_chip *chip);
  74void usb6fire_pcm_abort(struct sfire_chip *chip);
  75void usb6fire_pcm_destroy(struct sfire_chip *chip);
  76#endif /* USB6FIRE_PCM_H */
  77