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   1 /*
   2  * Copyright (c) 2008, Kohsuke Ohtani
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  30 #ifndef _SYS_DEVICE_H
  31 #define _SYS_DEVICE_H
  33 #include <sys/cdefs.h>
  34 #include <sys/types.h>
  36 /*
  37  * Device flags
  38  *
  39  * If D_PROT is set, the device can not be opened via devfs.
  40  */
  41 #define D_CHR           0x00000001      /* character device */
  42 #define D_BLK           0x00000002      /* block device */
  43 #define D_REM           0x00000004      /* removable device */
  44 #define D_PROT          0x00000008      /* protected device */
  45 #define D_TTY           0x00000010      /* tty device */
  48 #ifdef KERNEL
  50 /*
  51  * Device operations
  52  */
  53 struct devops {
  54         int (*open)     (device_t, int);
  55         int (*close)    (device_t);
  56         int (*read)     (device_t, char *, size_t *, int);
  57         int (*write)    (device_t, char *, size_t *, int);
  58         int (*ioctl)    (device_t, u_long, void *);
  59         int (*devctl)   (device_t, u_long, void *);
  60 };
  62 typedef int (*devop_open_t)   (device_t, int);
  63 typedef int (*devop_close_t)  (device_t);
  64 typedef int (*devop_read_t)   (device_t, char *, size_t *, int);
  65 typedef int (*devop_write_t)  (device_t, char *, size_t *, int);
  66 typedef int (*devop_ioctl_t)  (device_t, u_long, void *);
  67 typedef int (*devop_devctl_t) (device_t, u_long, void *);
  69 #define no_open         ((devop_open_t)nullop)
  70 #define no_close        ((devop_close_t)nullop)
  71 #define no_read         ((devop_read_t)enodev)
  72 #define no_write        ((devop_write_t)enodev)
  73 #define no_ioctl        ((devop_ioctl_t)enodev)
  74 #define no_devctl       ((devop_devctl_t)nullop)
  76 /*
  77  * Driver object
  78  */
  79 struct driver {
  80         const char      *name;          /* name of device driver */
  81         struct devops   *devops;        /* device operations */
size_t          devsz;          /* size of private data */
  83         int             flags;          /* state of driver */
  84         int (*probe)    (struct driver *);
  85         int (*init)     (struct driver *);
  86         int (*unload)   (struct driver *);
  87 };
  89 /*
  90  * flags for the driver.
  91  */
  92 #define DS_INACTIVE     0x00            /* driver is inactive */
  93 #define DS_ALIVE        0x01            /* probe succeded */
  94 #define DS_ACTIVE       0x02            /* intialized */
  95 #define DS_DEBUG        0x04            /* debug */
  97 #endif /* !KERNEL */
  98 #endif /* !_SYS_DEVICE_H */