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| Rev | Author | Line No. | Line |
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| 510 | jermar | 1 | /* |
| 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 | |||
| 29 | #ifndef __CHARDEV_H__ |
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| 30 | #define __CHARDEV_H__ |
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| 31 | |||
| 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 | |||
| 511 | jermar | 37 | #define CHARDEV_BUFLEN 512 |
| 510 | jermar | 38 | |
| 511 | jermar | 39 | /* Character device operations interface. */ |
| 40 | struct chardev_operations { |
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| 586 | jermar | 41 | void (* suspend)(chardev_t *); /**< Suspend pushing characters. */ |
| 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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| 607 | palkovsky | 44 | /** Read character directly from device, assume interrupts disabled */ |
| 45 | char (* read)(chardev_t *); |
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| 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 { |
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| 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; |
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| 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, |
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| 65 | chardev_operations_t *op); |
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| 669 | jermar | 66 | extern void chardev_push_character(chardev_t *chardev, __u8 ch); |
| 510 | jermar | 67 | |
| 68 | #endif /* __CHARDEV_H__ */ |