56 строки
1.0 KiB
C
56 строки
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright IBM Corp. 2001,2008
|
|
*
|
|
* This file contains the IRQ specific code for hvc_console
|
|
*
|
|
*/
|
|
|
|
#include <linux/interrupt.h>
|
|
|
|
#include "hvc_console.h"
|
|
|
|
static irqreturn_t hvc_handle_interrupt(int irq, void *dev_instance)
|
|
{
|
|
/* if hvc_poll request a repoll, then kick the hvcd thread */
|
|
if (hvc_poll(dev_instance))
|
|
hvc_kick();
|
|
|
|
/*
|
|
* We're safe to always return IRQ_HANDLED as the hvcd thread will
|
|
* iterate through each hvc_struct.
|
|
*/
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* For IRQ based systems these callbacks can be used
|
|
*/
|
|
int notifier_add_irq(struct hvc_struct *hp, int irq)
|
|
{
|
|
int rc;
|
|
|
|
if (!irq) {
|
|
hp->irq_requested = 0;
|
|
return 0;
|
|
}
|
|
rc = request_irq(irq, hvc_handle_interrupt, hp->flags,
|
|
"hvc_console", hp);
|
|
if (!rc)
|
|
hp->irq_requested = 1;
|
|
return rc;
|
|
}
|
|
|
|
void notifier_del_irq(struct hvc_struct *hp, int irq)
|
|
{
|
|
if (!hp->irq_requested)
|
|
return;
|
|
free_irq(irq, hp);
|
|
hp->irq_requested = 0;
|
|
}
|
|
|
|
void notifier_hangup_irq(struct hvc_struct *hp, int irq)
|
|
{
|
|
notifier_del_irq(hp, irq);
|
|
}
|