blob: efadc11640d7f8837fce1133620fdb79dd4ca58f [file] [log] [blame]
/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include "linux/kernel.h"
#include "linux/list.h"
#include "linux/slab.h"
#include "asm/irq.h"
#include "init.h"
#include "sigio.h"
#include "irq_user.h"
#include "irq_kern.h"
/* Protected by sigio_lock() called from write_sigio_workaround */
static int sigio_irq_fd = -1;
static void sigio_interrupt(int irq, void *data, struct pt_regs *unused)
{
read_sigio_fd(sigio_irq_fd);
reactivate_fd(sigio_irq_fd, SIGIO_WRITE_IRQ);
}
int write_sigio_irq(int fd)
{
int err;
err = um_request_irq(SIGIO_WRITE_IRQ, fd, IRQ_READ, sigio_interrupt,
SA_INTERRUPT | SA_SAMPLE_RANDOM, "write sigio",
NULL);
if(err){
printk("write_sigio_irq : um_request_irq failed, err = %d\n",
err);
return(-1);
}
sigio_irq_fd = fd;
return(0);
}
static spinlock_t sigio_spinlock = SPIN_LOCK_UNLOCKED;
void sigio_lock(void)
{
spin_lock(&sigio_spinlock);
}
void sigio_unlock(void)
{
spin_unlock(&sigio_spinlock);
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/