bus_private.h

/*-
 * Copyright (c) 1997,1998 Doug Rabson
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	$Id: bus_private.h,v 1.4 1998/11/14 21:58:41 wollman Exp $
 */

#ifndef _SYS_BUS_PRIVATE_H_
#define _SYS_BUS_PRIVATE_H_

#include <sys/bus.h>

/*
 * Forward declarations
 */
typedef TAILQ_HEAD(devclass_list, devclass) devclass_list_t;
typedef TAILQ_HEAD(driver_list, driver) driver_list_t;
typedef TAILQ_HEAD(device_list, device) device_list_t;

struct devclass {
    TAILQ_ENTRY(devclass) link;
    driver_list_t	drivers; /* bus devclasses store drivers for bus */
    char		*name;
    device_t		*devices; /* array of devices indexed by unit */
    int			maxunit; /* size of devices array */
    int			nextunit; /* next unused unit number */
};

/*
 * Resources from config(8).
 */
typedef enum {
    RES_INT, RES_STRING, RES_LONG
} resource_type;

struct config_resource {
    char		*name;
    resource_type	type;
    union {
	long		longval;
	int		intval;
	char*		stringval;
    } u;
};

struct config_device {
    char		*name;	/* e.g. "lpt", "wdc" etc */
    int			unit;
    int			resource_count;
    struct config_resource	*resources;
};

/*
 * Compiled device methods.
 */
struct device_ops {
    int maxoffset;
    devop_t methods[1];
};

/*
 * Helpers for device method wrappers.
 */
#define DEVOPDESC(OP)	(&OP##_##desc)

#define DEVOPOFF(DEV, OP)				\
	((DEVOPDESC(OP)->offset >= DEV->ops->maxoffset	\
	  || !DEV->ops->methods[DEVOPDESC(OP)->offset])	\
	 ? 0 : DEVOPDESC(OP)->offset)

#define DEVOPMETH(DEV, OP) (DEV->ops->methods[DEVOPOFF(DEV, OP)])

/*
 * Implementation of device.
 */
struct device {
    /*
     * Device hierarchy.
     */
    TAILQ_ENTRY(device)	link;	/* list of devices in parent */
    device_t		parent;
    device_list_t	children; /* list of subordinate devices */

    /*
     * Details of this device.
     */
    device_ops_t	ops;
    driver_t		*driver;
    devclass_t		devclass; /* device class which we are in */
    int			unit;
    const char*		desc;	/* driver specific description */
    int			busy;	/* count of calls to device_busy() */
    device_state_t	state;
    int			flags;
#define DF_ENABLED	1	/* device should be probed/attached */
#define DF_FIXEDCLASS	2	/* devclass specified at create time */
#define DF_WILDCARD	4	/* unit was originally wildcard */
    void		*ivars;
    void		*softc;
};

struct device_op_desc {
    unsigned int	offset;	/* offset in driver ops */
    const char*		name;	/* unique name (for registration) */
};

#endif /* !_SYS_BUS_PRIVATE_H_ */