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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)(chardev_t *); /**< Suspend pushing characters. */ |
41 | void (* suspend)(chardev_t *); /**< Suspend pushing characters. */ |
42 | void (* resume)(chardev_t *); /**< Resume pushing characters. */ |
42 | void (* resume)(chardev_t *); /**< Resume pushing characters. */ |
43 | void (* write)(chardev_t *, char c); /**< Write character to stream. */ |
43 | void (* write)(chardev_t *, char c); /**< Write character to stream. */ |
- | 44 | /** Read character directly from device, assume interrupts disabled */ |
|
- | 45 | char (* read)(chardev_t *); |
|
44 | }; |
46 | }; |
45 | 47 | ||
46 | typedef struct chardev_operations chardev_operations_t; |
48 | typedef struct chardev_operations chardev_operations_t; |
47 | 49 | ||
48 | /** Character input device. */ |
50 | /** Character input device. */ |
49 | struct chardev { |
51 | struct chardev { |
50 | char *name; |
52 | char *name; |
51 | 53 | ||
52 | waitq_t wq; |
54 | waitq_t wq; |
53 | spinlock_t lock; /**< Protects everything below. */ |
55 | spinlock_t lock; /**< Protects everything below. */ |
54 | __u8 buffer[CHARDEV_BUFLEN]; |
56 | __u8 buffer[CHARDEV_BUFLEN]; |
55 | count_t counter; |
57 | count_t counter; |
56 | chardev_operations_t *op; /**< Implementation of chardev operations. */ |
58 | chardev_operations_t *op; /**< Implementation of chardev operations. */ |
57 | index_t index; |
59 | index_t index; |
58 | void *data; |
60 | void *data; |
59 | }; |
61 | }; |
60 | 62 | ||
61 | extern void chardev_initialize(char *name, |
63 | extern void chardev_initialize(char *name, |
62 | chardev_t *chardev, |
64 | chardev_t *chardev, |
63 | chardev_operations_t *op); |
65 | chardev_operations_t *op); |
64 | void chardev_push_character(chardev_t *chardev, __u8 ch); |
66 | void chardev_push_character(chardev_t *chardev, __u8 ch); |
65 | 67 | ||
66 | #endif /* __CHARDEV_H__ */ |
68 | #endif /* __CHARDEV_H__ */ |
67 | 69 |