1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com) |
4 | */ |
5 | |
6 | #include <linux/interrupt.h> |
7 | #include <irq_kern.h> |
8 | #include <os.h> |
9 | #include <sigio.h> |
10 | |
11 | /* Protected by sigio_lock() called from write_sigio_workaround */ |
12 | static int sigio_irq_fd = -1; |
13 | |
14 | static irqreturn_t sigio_interrupt(int irq, void *data) |
15 | { |
16 | char c; |
17 | |
18 | os_read_file(sigio_irq_fd, &c, sizeof(c)); |
19 | return IRQ_HANDLED; |
20 | } |
21 | |
22 | int write_sigio_irq(int fd) |
23 | { |
24 | int err; |
25 | |
26 | err = um_request_irq(SIGIO_WRITE_IRQ, fd, IRQ_READ, sigio_interrupt, |
27 | 0, "write sigio" , NULL); |
28 | if (err < 0) { |
29 | printk(KERN_ERR "write_sigio_irq : um_request_irq failed, " |
30 | "err = %d\n" , err); |
31 | return -1; |
32 | } |
33 | sigio_irq_fd = fd; |
34 | return 0; |
35 | } |
36 | |
37 | /* These are called from os-Linux/sigio.c to protect its pollfds arrays. */ |
38 | static DEFINE_MUTEX(sigio_mutex); |
39 | |
40 | void sigio_lock(void) |
41 | { |
42 | mutex_lock(&sigio_mutex); |
43 | } |
44 | |
45 | void sigio_unlock(void) |
46 | { |
47 | mutex_unlock(lock: &sigio_mutex); |
48 | } |
49 | |