Commit | Line | Data |
---|---|---|
8e367065 | 1 | /* |
c5d4bb17 | 2 | * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com) |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | */ | |
5 | ||
c5d4bb17 | 6 | #include <linux/interrupt.h> |
1da177e4 | 7 | #include "irq_kern.h" |
8e367065 | 8 | #include "os.h" |
c5d4bb17 | 9 | #include "sigio.h" |
1da177e4 LT |
10 | |
11 | /* Protected by sigio_lock() called from write_sigio_workaround */ | |
12 | static int sigio_irq_fd = -1; | |
13 | ||
7bea96fd | 14 | static irqreturn_t sigio_interrupt(int irq, void *data) |
1da177e4 | 15 | { |
8e367065 JD |
16 | char c; |
17 | ||
a6ea4cce | 18 | os_read_file(sigio_irq_fd, &c, sizeof(c)); |
1da177e4 | 19 | reactivate_fd(sigio_irq_fd, SIGIO_WRITE_IRQ); |
4cffb7fa | 20 | return IRQ_HANDLED; |
1da177e4 LT |
21 | } |
22 | ||
23 | int write_sigio_irq(int fd) | |
24 | { | |
25 | int err; | |
26 | ||
27 | err = um_request_irq(SIGIO_WRITE_IRQ, fd, IRQ_READ, sigio_interrupt, | |
1d3468a6 | 28 | IRQF_DISABLED|IRQF_SAMPLE_RANDOM, "write sigio", |
1da177e4 | 29 | NULL); |
c5d4bb17 JD |
30 | if (err) { |
31 | printk(KERN_ERR "write_sigio_irq : um_request_irq failed, " | |
32 | "err = %d\n", err); | |
4cffb7fa | 33 | return -1; |
1da177e4 LT |
34 | } |
35 | sigio_irq_fd = fd; | |
4cffb7fa | 36 | return 0; |
1da177e4 LT |
37 | } |
38 | ||
d9f9d319 | 39 | /* These are called from os-Linux/sigio.c to protect its pollfds arrays. */ |
1da177e4 LT |
40 | static DEFINE_SPINLOCK(sigio_spinlock); |
41 | ||
42 | void sigio_lock(void) | |
43 | { | |
44 | spin_lock(&sigio_spinlock); | |
45 | } | |
46 | ||
47 | void sigio_unlock(void) | |
48 | { | |
49 | spin_unlock(&sigio_spinlock); | |
50 | } |