linux-vybrid_public/drivers/media/video/pvrusb2/pvrusb2-context.h

/*
 *  $Id$
 *
 *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
 *
 *  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
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
#ifndef __PVRUSB2_BASE_H
#define __PVRUSB2_BASE_H

#include <linux/mutex.h>
#include <linux/usb.h>
#include <linux/workqueue.h>

struct pvr2_hdw;     /* hardware interface - defined elsewhere */
struct pvr2_stream;  /* stream interface - defined elsewhere */

struct pvr2_context;        /* All central state */
struct pvr2_channel;        /* One I/O pathway to a user */
struct pvr2_context_stream; /* Wrapper for a stream */
struct pvr2_crit_reg;       /* Critical region pointer */
struct pvr2_ioread;         /* Low level stream structure */

struct pvr2_context_stream {
	struct pvr2_channel *user;
	struct pvr2_stream *stream;
};

struct pvr2_context {
	struct pvr2_channel *mc_first;
	struct pvr2_channel *mc_last;
	struct pvr2_hdw *hdw;
	struct pvr2_context_stream video_stream;
	struct mutex mutex;
	int disconnect_flag;

	/* Called after pvr2_context initialization is complete */
	void (*setup_func)(struct pvr2_context *);

	/* Work queue overhead for out-of-line processing */
	struct workqueue_struct *workqueue;
	struct work_struct workinit;
	struct work_struct workpoll;
};

struct pvr2_channel {
	struct pvr2_context *mc_head;
	struct pvr2_channel *mc_next;
	struct pvr2_channel *mc_prev;
	struct pvr2_context_stream *stream;
	struct pvr2_hdw *hdw;
	void (*check_func)(struct pvr2_channel *);
};

void pvr2_context_enter(struct pvr2_context *);
void pvr2_context_exit(struct pvr2_context *);

struct pvr2_context *pvr2_context_create(struct usb_interface *intf,
					 const struct usb_device_id *devid,
					 void (*setup_func)(struct pvr2_context *));
void pvr2_context_disconnect(struct pvr2_context *);

void pvr2_channel_init(struct pvr2_channel *,struct pvr2_context *);
void pvr2_channel_done(struct pvr2_channel *);
int pvr2_channel_claim_stream(struct pvr2_channel *,
			      struct pvr2_context_stream *);
struct pvr2_ioread *pvr2_channel_create_mpeg_stream(
	struct pvr2_context_stream *);


#endif /* __PVRUSB2_CONTEXT_H */
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