77 lines
2 KiB
C
77 lines
2 KiB
C
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/*
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* Linux driver for TerraTec DMX 6Fire USB
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*
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* Author: Torsten Schenk <torsten.schenk@zoho.com>
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* Created: Jan 01, 2011
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* Version: 0.3.0
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* Copyright: (C) Torsten Schenk
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef USB6FIRE_PCM_H
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#define USB6FIRE_PCM_H
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#include <sound/pcm.h>
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#include <linux/mutex.h>
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#include "common.h"
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enum /* settings for pcm */
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{
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/* maximum of EP_W_MAX_PACKET_SIZE[] (see firmware.c) */
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PCM_N_URBS = 16, PCM_N_PACKETS_PER_URB = 8, PCM_MAX_PACKET_SIZE = 604
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};
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struct pcm_urb {
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struct sfire_chip *chip;
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/* BEGIN DO NOT SEPARATE */
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struct urb instance;
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struct usb_iso_packet_descriptor packets[PCM_N_PACKETS_PER_URB];
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/* END DO NOT SEPARATE */
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u8 buffer[PCM_N_PACKETS_PER_URB * PCM_MAX_PACKET_SIZE];
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struct pcm_urb *peer;
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};
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struct pcm_substream {
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spinlock_t lock;
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struct snd_pcm_substream *instance;
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bool active;
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snd_pcm_uframes_t dma_off; /* current position in alsa dma_area */
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snd_pcm_uframes_t period_off; /* current position in current period */
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};
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struct pcm_runtime {
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struct sfire_chip *chip;
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struct snd_pcm *instance;
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struct pcm_substream playback;
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struct pcm_substream capture;
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bool panic; /* if set driver won't do anymore pcm on device */
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struct pcm_urb in_urbs[PCM_N_URBS];
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struct pcm_urb out_urbs[PCM_N_URBS];
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int in_packet_size;
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int out_packet_size;
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int in_n_analog; /* number of analog channels soundcard sends */
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int out_n_analog; /* number of analog channels soundcard receives */
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struct mutex stream_mutex;
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u8 stream_state; /* one of STREAM_XXX (pcm.c) */
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u8 rate; /* one of PCM_RATE_XXX */
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wait_queue_head_t stream_wait_queue;
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bool stream_wait_cond;
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};
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int __devinit usb6fire_pcm_init(struct sfire_chip *chip);
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void usb6fire_pcm_abort(struct sfire_chip *chip);
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void usb6fire_pcm_destroy(struct sfire_chip *chip);
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#endif /* USB6FIRE_PCM_H */
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