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