LXR linux/sound/usb/6fire/pcm.h

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 * Linux driver for TerraTec DMX 6Fire USB
   4 *
   5 * Author:      Torsten Schenk <torsten.schenk@zoho.com>
   6 * Created:     Jan 01, 2011
   7 * Copyright:   (C) Torsten Schenk
   8 */
   9
  10#ifndef USB6FIRE_PCM_H
  11#define USB6FIRE_PCM_H
  12
  13#include <sound/pcm.h>
  14#include <linux/mutex.h>
  15
  16#include "common.h"
  17
  18enum /* settings for pcm */
  19{
  20        /* maximum of EP_W_MAX_PACKET_SIZE[] (see firmware.c) */
  21        PCM_N_URBS = 16, PCM_N_PACKETS_PER_URB = 8, PCM_MAX_PACKET_SIZE = 604
  22};
  23
  24struct pcm_urb {
  25        struct sfire_chip *chip;
  26
  27        /* BEGIN DO NOT SEPARATE */
  28        struct urb instance;
  29        struct usb_iso_packet_descriptor packets[PCM_N_PACKETS_PER_URB];
  30        /* END DO NOT SEPARATE */
  31        u8 *buffer;
  32
  33        struct pcm_urb *peer;
  34};
  35
  36struct pcm_substream {
  37        spinlock_t lock;
  38        struct snd_pcm_substream *instance;
  39
  40        bool active;
  41
  42        snd_pcm_uframes_t dma_off; /* current position in alsa dma_area */
  43        snd_pcm_uframes_t period_off; /* current position in current period */
  44};
  45
  46struct pcm_runtime {
  47        struct sfire_chip *chip;
  48        struct snd_pcm *instance;
  49
  50        struct pcm_substream playback;
  51        struct pcm_substream capture;
  52        bool panic; /* if set driver won't do anymore pcm on device */
  53
  54        struct pcm_urb in_urbs[PCM_N_URBS];
  55        struct pcm_urb out_urbs[PCM_N_URBS];
  56        int in_packet_size;
  57        int out_packet_size;
  58        int in_n_analog; /* number of analog channels soundcard sends */
  59        int out_n_analog; /* number of analog channels soundcard receives */
  60
  61        struct mutex stream_mutex;
  62        u8 stream_state; /* one of STREAM_XXX (pcm.c) */
  63        u8 rate; /* one of PCM_RATE_XXX */
  64        wait_queue_head_t stream_wait_queue;
  65        bool stream_wait_cond;
  66};
  67
  68int usb6fire_pcm_init(struct sfire_chip *chip);
  69void usb6fire_pcm_abort(struct sfire_chip *chip);
  70void usb6fire_pcm_destroy(struct sfire_chip *chip);
  71#endif /* USB6FIRE_PCM_H */
  72