Subversion Repositories HelenOS-historic

Rev

Rev 623 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
510 jermar 1
/*
2
 * Copyright (C) 2005 Jakub Jermar
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
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
29
#ifndef __CHARDEV_H__
30
#define __CHARDEV_H__
31
 
32
#include <typedefs.h>
33
#include <arch/types.h>
34
#include <synch/waitq.h>
35
#include <synch/spinlock.h>
36
 
511 jermar 37
#define CHARDEV_BUFLEN 512
510 jermar 38
 
511 jermar 39
/* Character device operations interface. */
40
struct chardev_operations {
586 jermar 41
    void (* suspend)(chardev_t *);      /**< Suspend pushing characters. */
42
    void (* resume)(chardev_t *);       /**< Resume pushing characters. */
43
    void (* write)(chardev_t *, char c);    /**< Write character to stream. */
607 palkovsky 44
    /** Read character directly from device, assume interrupts disabled */
45
    char (* read)(chardev_t *);
511 jermar 46
};
510 jermar 47
 
511 jermar 48
typedef struct chardev_operations chardev_operations_t;
49
 
510 jermar 50
/** Character input device. */
51
struct chardev {
575 palkovsky 52
    char *name;
53
 
510 jermar 54
    waitq_t wq;
623 jermar 55
    SPINLOCK_DECLARE(lock);     /**< Protects everything below. */
510 jermar 56
    __u8 buffer[CHARDEV_BUFLEN];
57
    count_t counter;
575 palkovsky 58
    chardev_operations_t *op;   /**< Implementation of chardev operations. */
510 jermar 59
    index_t index;
575 palkovsky 60
    void *data;
510 jermar 61
};
62
 
575 palkovsky 63
extern void chardev_initialize(char *name,
64
                   chardev_t *chardev,
65
                   chardev_operations_t *op);
669 jermar 66
extern void chardev_push_character(chardev_t *chardev, __u8 ch);
510 jermar 67
 
68
#endif /* __CHARDEV_H__ */