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