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1 | /* |
1 | /* |
2 | * Copyright (C) 2005 Jakub Jermar |
2 | * Copyright (C) 2005 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #ifndef __CHARDEV_H__ |
29 | #ifndef __CHARDEV_H__ |
30 | #define __CHARDEV_H__ |
30 | #define __CHARDEV_H__ |
31 | 31 | ||
32 | #include <typedefs.h> |
32 | #include <typedefs.h> |
33 | #include <arch/types.h> |
33 | #include <arch/types.h> |
34 | #include <synch/waitq.h> |
34 | #include <synch/waitq.h> |
35 | #include <synch/spinlock.h> |
35 | #include <synch/spinlock.h> |
36 | 36 | ||
37 | #define CHARDEV_BUFLEN 512 |
37 | #define CHARDEV_BUFLEN 512 |
38 | 38 | ||
39 | /* Character device operations interface. */ |
39 | /* Character device operations interface. */ |
40 | struct chardev_operations { |
40 | struct chardev_operations { |
41 | void (* suspend)(void); /**< Suspend pushing characters. */ |
41 | void (* suspend)(void); /**< Suspend pushing characters. */ |
42 | void (* resume)(void); /**< Resume pushing characters. */ |
42 | void (* resume)(void); /**< Resume pushing characters. */ |
43 | }; |
43 | }; |
44 | 44 | ||
45 | typedef struct chardev_operations chardev_operations_t; |
45 | typedef struct chardev_operations chardev_operations_t; |
46 | 46 | ||
47 | /** Character input device. */ |
47 | /** Character input device. */ |
48 | struct chardev { |
48 | struct chardev { |
49 | waitq_t wq; |
49 | waitq_t wq; |
50 | spinlock_t lock; /**< Protects everything below. */ |
50 | spinlock_t lock; /**< Protects everything below. */ |
51 | __u8 buffer[CHARDEV_BUFLEN]; |
51 | __u8 buffer[CHARDEV_BUFLEN]; |
52 | count_t counter; |
52 | count_t counter; |
53 | index_t index; |
53 | index_t index; |
54 | chardev_operations_t *op; /**< Implementation of chardev operations. */ |
54 | chardev_operations_t *op; /**< Implementation of chardev operations. */ |
55 | }; |
55 | }; |
56 | 56 | ||
57 | extern void chardev_initialize(chardev_t *chardev, chardev_operations_t *op); |
57 | extern void chardev_initialize(chardev_t *chardev, chardev_operations_t *op); |
58 | void chardev_push_character(chardev_t *chardev, __u8 ch); |
58 | void chardev_push_character(chardev_t *chardev, __u8 ch); |
59 | 59 | ||
60 | #endif /* __CHARDEV_H__ */ |
60 | #endif /* __CHARDEV_H__ */ |
61 | 61 |