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/*
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 * Copyright (c) 2008, Kohsuke Ohtani
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the author nor the names of any co-contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#ifndef _SYS_DEVICE_H
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#define _SYS_DEVICE_H
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#include <sys/cdefs.h>
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#include <sys/types.h>
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/*
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 * Device flags
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 *
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 * If D_PROT is set, the device can not be opened via devfs.
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 */
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#define D_CHR                0x00000001        /* character device */
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#define D_BLK                0x00000002        /* block device */
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#define D_REM                0x00000004        /* removable device */
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#define D_PROT                0x00000008        /* protected device */
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#define D_TTY                0x00000010        /* tty device */
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#ifdef KERNEL
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/*
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 * Device operations
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 */
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struct devops {
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        int (*open)        (device_t, int);
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        int (*close)        (device_t);
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        int (*read)        (device_t, char *, size_t *, int);
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        int (*write)        (device_t, char *, size_t *, int);
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        int (*ioctl)        (device_t, u_long, void *);
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        int (*devctl)        (device_t, u_long, void *);
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};
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typedef int (*devop_open_t)   (device_t, int);
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typedef int (*devop_close_t)  (device_t);
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typedef int (*devop_read_t)   (device_t, char *, size_t *, int);
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typedef int (*devop_write_t)  (device_t, char *, size_t *, int);
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typedef int (*devop_ioctl_t)  (device_t, u_long, void *);
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typedef int (*devop_devctl_t) (device_t, u_long, void *);
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#define        no_open                ((devop_open_t)nullop)
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#define        no_close        ((devop_close_t)nullop)
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#define        no_read                ((devop_read_t)enodev)
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#define        no_write        ((devop_write_t)enodev)
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#define        no_ioctl        ((devop_ioctl_t)enodev)
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#define        no_devctl        ((devop_devctl_t)nullop)
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/*
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 * Driver object
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 */
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struct driver {
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        const char        *name;                /* name of device driver */
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        struct devops        *devops;        /* device operations */
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        size_t                devsz;                /* size of private data */
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        int                flags;                /* state of driver */
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        int (*probe)        (struct driver *);
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        int (*init)        (struct driver *);
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        int (*unload)        (struct driver *);
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};
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/*
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 * flags for the driver.
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 */
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#define        DS_INACTIVE        0x00                /* driver is inactive */
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#define DS_ALIVE        0x01                /* probe succeded */
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#define DS_ACTIVE        0x02                /* intialized */
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#define DS_DEBUG        0x04                /* debug */
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#endif /* !KERNEL */
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#endif /* !_SYS_DEVICE_H */