Commit | Line | Data |
---|---|---|
9e48565d AC |
1 | /* |
2 | * Tty port functions | |
3 | */ | |
4 | ||
5 | #include <linux/types.h> | |
6 | #include <linux/errno.h> | |
7 | #include <linux/tty.h> | |
8 | #include <linux/tty_driver.h> | |
9 | #include <linux/tty_flip.h> | |
10 | #include <linux/timer.h> | |
11 | #include <linux/string.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/sched.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/wait.h> | |
16 | #include <linux/bitops.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/module.h> | |
19 | ||
20 | void tty_port_init(struct tty_port *port) | |
21 | { | |
22 | memset(port, 0, sizeof(*port)); | |
23 | init_waitqueue_head(&port->open_wait); | |
24 | init_waitqueue_head(&port->close_wait); | |
25 | mutex_init(&port->mutex); | |
26 | port->close_delay = (50 * HZ) / 100; | |
27 | port->closing_wait = (3000 * HZ) / 100; | |
28 | } | |
29 | EXPORT_SYMBOL(tty_port_init); | |
30 | ||
31 | int tty_port_alloc_xmit_buf(struct tty_port *port) | |
32 | { | |
33 | /* We may sleep in get_zeroed_page() */ | |
34 | mutex_lock(&port->mutex); | |
35 | if (port->xmit_buf == NULL) | |
36 | port->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL); | |
37 | mutex_unlock(&port->mutex); | |
38 | if (port->xmit_buf == NULL) | |
39 | return -ENOMEM; | |
40 | return 0; | |
41 | } | |
42 | EXPORT_SYMBOL(tty_port_alloc_xmit_buf); | |
43 | ||
44 | void tty_port_free_xmit_buf(struct tty_port *port) | |
45 | { | |
46 | mutex_lock(&port->mutex); | |
47 | if (port->xmit_buf != NULL) { | |
48 | free_page((unsigned long)port->xmit_buf); | |
49 | port->xmit_buf = NULL; | |
50 | } | |
51 | mutex_unlock(&port->mutex); | |
52 | } | |
53 | EXPORT_SYMBOL(tty_port_free_xmit_buf); | |
54 | ||
55 |