Commit | Line | Data |
---|---|---|
8e367065 | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com) |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
6 | #include "linux/kernel.h" | |
7 | #include "linux/list.h" | |
8 | #include "linux/slab.h" | |
9 | #include "linux/signal.h" | |
10 | #include "linux/interrupt.h" | |
11 | #include "init.h" | |
12 | #include "sigio.h" | |
13 | #include "irq_user.h" | |
14 | #include "irq_kern.h" | |
8e367065 | 15 | #include "os.h" |
1da177e4 LT |
16 | |
17 | /* Protected by sigio_lock() called from write_sigio_workaround */ | |
18 | static int sigio_irq_fd = -1; | |
19 | ||
20 | static irqreturn_t sigio_interrupt(int irq, void *data, struct pt_regs *unused) | |
21 | { | |
8e367065 JD |
22 | char c; |
23 | ||
24 | os_read_file(sigio_irq_fd, &c, sizeof(c)); | |
1da177e4 LT |
25 | reactivate_fd(sigio_irq_fd, SIGIO_WRITE_IRQ); |
26 | return(IRQ_HANDLED); | |
27 | } | |
28 | ||
29 | int write_sigio_irq(int fd) | |
30 | { | |
31 | int err; | |
32 | ||
33 | err = um_request_irq(SIGIO_WRITE_IRQ, fd, IRQ_READ, sigio_interrupt, | |
bd6aa650 | 34 | IRQF_DISABLED | IRQF_SAMPLE_RANDOM, "write sigio", |
1da177e4 LT |
35 | NULL); |
36 | if(err){ | |
37 | printk("write_sigio_irq : um_request_irq failed, err = %d\n", | |
38 | err); | |
39 | return(-1); | |
40 | } | |
41 | sigio_irq_fd = fd; | |
42 | return(0); | |
43 | } | |
44 | ||
45 | static DEFINE_SPINLOCK(sigio_spinlock); | |
46 | ||
47 | void sigio_lock(void) | |
48 | { | |
49 | spin_lock(&sigio_spinlock); | |
50 | } | |
51 | ||
52 | void sigio_unlock(void) | |
53 | { | |
54 | spin_unlock(&sigio_spinlock); | |
55 | } |