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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
*/
#include <linux/interrupt.h>
#include <irq_kern.h>
#include <os.h>
#include <sigio.h>
/* Protected by sigio_lock() called from write_sigio_workaround */
static int sigio_irq_fd = -1;
static irqreturn_t sigio_interrupt(int irq, void *data)
{
char c;
os_read_file(sigio_irq_fd, &c, sizeof(c));
return IRQ_HANDLED;
}
int write_sigio_irq(int fd)
{
int err;
err = um_request_irq(SIGIO_WRITE_IRQ, fd, IRQ_READ, sigio_interrupt,
0, "write sigio", NULL);
if (err) {
printk(KERN_ERR "write_sigio_irq : um_request_irq failed, "
"err = %d\n", err);
return -1;
}
sigio_irq_fd = fd;
return 0;
}
/* These are called from os-Linux/sigio.c to protect its pollfds arrays. */
static DEFINE_MUTEX(sigio_mutex);
void sigio_lock(void)
{
mutex_lock(&sigio_mutex);
}
void sigio_unlock(void)
{
mutex_unlock(&sigio_mutex);
}
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