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 */
12static int sigio_irq_fd = -1;
13
14static 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
22int 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) {
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. */
38static DEFINE_SPINLOCK(sigio_spinlock);
39
40void sigio_lock(void)
41{
42	spin_lock(&sigio_spinlock);
43}
44
45void sigio_unlock(void)
46{
47	spin_unlock(&sigio_spinlock);
48}

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