0,0 → 1,60 |
/* |
* Copyright (C) 2005 Jakub Jermar |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
|
#ifndef __CHARDEV_H__ |
#define __CHARDEV_H__ |
|
#include <typedefs.h> |
#include <arch/types.h> |
#include <synch/waitq.h> |
#include <synch/spinlock.h> |
|
#define CHARDEV_BUFLEN 512 |
|
/* Character device operations interface. */ |
struct chardev_operations { |
void (* suspend)(void); /**< Suspend pushing characters. */ |
void (* resume)(void); /**< Resume pushing characters. */ |
}; |
|
typedef struct chardev_operations chardev_operations_t; |
|
/** Character input device. */ |
struct chardev { |
waitq_t wq; |
spinlock_t lock; /**< Protects everything below. */ |
__u8 buffer[CHARDEV_BUFLEN]; |
count_t counter; |
index_t index; |
chardev_operations_t *op; /**< Implementation of chardev operations. */ |
}; |
|
extern void chardev_initialize(chardev_t *chardev, chardev_operations_t *op); |
void chardev_push_character(chardev_t *chardev, __u8 ch); |
|
#endif /* __CHARDEV_H__ */ |