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510 jermar 1 
/*
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 * Copyright (c) 2005 Jakub Jermar
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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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 *
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 * - 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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 * - 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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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup genericconsole
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 * @{
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 */
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/** @file
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 */
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#ifndef KERN_CHARDEV_H_
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#define KERN_CHARDEV_H_
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#include <arch/types.h>
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#include <synch/waitq.h>
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#include <synch/spinlock.h>
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#define CHARDEV_BUFLEN 512
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struct chardev;
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/* Character device operations interface. */
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typedef struct {
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    /** Suspend pushing characters. */
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    void (* suspend)(struct chardev *);
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    /** Resume pushing characters. */
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    void (* resume)(struct chardev *);
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    /** Write character to stream. */
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    void (* write)(struct chardev *, char c, bool silent);
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    /** Read character directly from device, assume interrupts disabled. */
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    char (* read)(struct chardev *);
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} chardev_operations_t;
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/** Character input device. */
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typedef struct chardev {
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    char *name;
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    waitq_t wq;
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    /** Protects everything below. */
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    SPINLOCK_DECLARE(lock);
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    uint8_t buffer[CHARDEV_BUFLEN];
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    count_t counter;
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    /** Implementation of chardev operations. */
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    chardev_operations_t *op;
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    index_t index;
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    void *data;
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} chardev_t;
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extern void chardev_initialize(char *name, chardev_t *chardev,
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    chardev_operations_t *op);
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extern void chardev_push_character(chardev_t *chardev, uint8_t ch);
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#endif /* KERN_CHARDEV_H_ */
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/** @}
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 */