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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/sound/usb/6fire/pcm.h
10817 views
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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 <[email protected]>

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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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