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
  18 enum /* 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
  24 struct 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
  36 struct 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
  46 struct 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
  68 int usb6fire_pcm_init(struct sfire_chip *chip);
  69 void usb6fire_pcm_abort(struct sfire_chip *chip);
  70 void usb6fire_pcm_destroy(struct sfire_chip *chip);
  71 #endif /* USB6FIRE_PCM_H */