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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 | #include <console/chardev.h> |
29 | #include <console/chardev.h> |
30 | #include <putchar.h> |
30 | #include <putchar.h> |
31 | #include <synch/waitq.h> |
31 | #include <synch/waitq.h> |
32 | #include <synch/spinlock.h> |
32 | #include <synch/spinlock.h> |
33 | 33 | ||
34 | /** Initialize character device. |
34 | /** Initialize character device. |
35 | * |
35 | * |
36 | * @param chardev Character device. |
36 | * @param chardev Character device. |
37 | * @param op Implementation of character device operations. |
37 | * @param op Implementation of character device operations. |
38 | */ |
38 | */ |
39 | void chardev_initialize(chardev_t *chardev, chardev_operations_t *op) |
39 | void chardev_initialize(chardev_t *chardev, chardev_operations_t *op) |
40 | { |
40 | { |
41 | waitq_initialize(&chardev->wq); |
41 | waitq_initialize(&chardev->wq); |
42 | spinlock_initialize(&chardev->lock); |
42 | spinlock_initialize(&chardev->lock); |
43 | chardev->counter = 0; |
43 | chardev->counter = 0; |
44 | chardev->index = 0; |
44 | chardev->index = 0; |
45 | chardev->op = op; |
45 | chardev->op = op; |
46 | } |
46 | } |
47 | 47 | ||
48 | /** Push character read from input character device. |
48 | /** Push character read from input character device. |
49 | * |
49 | * |
50 | * @param chardev Character device. |
50 | * @param chardev Character device. |
51 | * @param ch Character being pushed. |
51 | * @param ch Character being pushed. |
52 | */ |
52 | */ |
53 | void chardev_push_character(chardev_t *chardev, __u8 ch) |
53 | void chardev_push_character(chardev_t *chardev, __u8 ch) |
54 | { |
54 | { |
55 | spinlock_lock(&chardev->lock); |
55 | spinlock_lock(&chardev->lock); |
56 | chardev->counter++; |
56 | chardev->counter++; |
57 | if (chardev->counter == CHARDEV_BUFLEN - 1) { |
57 | if (chardev->counter == CHARDEV_BUFLEN - 1) { |
58 | /* buffer full => disable device interrupt */ |
58 | /* buffer full => disable device interrupt */ |
59 | chardev->op->suspend(); |
59 | chardev->op->suspend(); |
60 | } |
60 | } |
61 | 61 | ||
62 | putchar(ch); |
62 | putchar(ch); |
63 | chardev->buffer[chardev->index++] = ch; |
63 | chardev->buffer[chardev->index++] = ch; |
64 | chardev->index = chardev->index % CHARDEV_BUFLEN; /* index modulo size of buffer */ |
64 | chardev->index = chardev->index % CHARDEV_BUFLEN; /* index modulo size of buffer */ |
65 | waitq_wakeup(&chardev->wq, WAKEUP_FIRST); |
65 | waitq_wakeup(&chardev->wq, WAKEUP_FIRST); |
66 | spinlock_unlock(&chardev->lock); |
66 | spinlock_unlock(&chardev->lock); |
67 | } |
67 | } |
68 | 68 |