root / prex-0.9.0 / include / sys / device.h @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 2008, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | #ifndef _SYS_DEVICE_H
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31 | #define _SYS_DEVICE_H
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32 | |||
33 | #include <sys/cdefs.h> |
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34 | #include <sys/types.h> |
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35 | |||
36 | /*
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37 | * Device flags
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38 | *
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39 | * If D_PROT is set, the device can not be opened via devfs.
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40 | */
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41 | #define D_CHR 0x00000001 /* character device */ |
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42 | #define D_BLK 0x00000002 /* block device */ |
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43 | #define D_REM 0x00000004 /* removable device */ |
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44 | #define D_PROT 0x00000008 /* protected device */ |
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45 | #define D_TTY 0x00000010 /* tty device */ |
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46 | |||
47 | |||
48 | #ifdef KERNEL
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49 | |||
50 | /*
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51 | * Device operations
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52 | */
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53 | struct devops {
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54 | int (*open) (device_t, int); |
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55 | int (*close) (device_t);
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56 | int (*read) (device_t, char *, size_t *, int); |
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57 | int (*write) (device_t, char *, size_t *, int); |
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58 | int (*ioctl) (device_t, u_long, void *); |
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59 | int (*devctl) (device_t, u_long, void *); |
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60 | }; |
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61 | |||
62 | typedef int (*devop_open_t) (device_t, int); |
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63 | typedef int (*devop_close_t) (device_t); |
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64 | typedef int (*devop_read_t) (device_t, char *, size_t *, int); |
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65 | typedef int (*devop_write_t) (device_t, char *, size_t *, int); |
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66 | typedef int (*devop_ioctl_t) (device_t, u_long, void *); |
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67 | typedef int (*devop_devctl_t) (device_t, u_long, void *); |
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68 | |||
69 | #define no_open ((devop_open_t)nullop)
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70 | #define no_close ((devop_close_t)nullop)
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71 | #define no_read ((devop_read_t)enodev)
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72 | #define no_write ((devop_write_t)enodev)
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73 | #define no_ioctl ((devop_ioctl_t)enodev)
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74 | #define no_devctl ((devop_devctl_t)nullop)
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75 | |||
76 | /*
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77 | * Driver object
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78 | */
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79 | struct driver {
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80 | const char *name; /* name of device driver */ |
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81 | struct devops *devops; /* device operations */ |
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82 | size_t devsz; /* size of private data */
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83 | int flags; /* state of driver */ |
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84 | int (*probe) (struct driver *); |
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85 | int (*init) (struct driver *); |
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86 | int (*unload) (struct driver *); |
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87 | }; |
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88 | |||
89 | /*
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90 | * flags for the driver.
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91 | */
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92 | #define DS_INACTIVE 0x00 /* driver is inactive */ |
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93 | #define DS_ALIVE 0x01 /* probe succeded */ |
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94 | #define DS_ACTIVE 0x02 /* intialized */ |
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95 | #define DS_DEBUG 0x04 /* debug */ |
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96 | |||
97 | #endif /* !KERNEL */ |
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98 | #endif /* !_SYS_DEVICE_H */ |