1/*
2 * Copyright IBM Corp. 2001,2008
3 *
4 * This file contains the IRQ specific code for hvc_console
5 *
6 */
7
8#include <linux/interrupt.h>
9
10#include "hvc_console.h"
11
12static irqreturn_t hvc_handle_interrupt(int irq, void *dev_instance)
13{
14	/* if hvc_poll request a repoll, then kick the hvcd thread */
15	if (hvc_poll(dev_instance))
16		hvc_kick();
17	return IRQ_HANDLED;
18}
19
20/*
21 * For IRQ based systems these callbacks can be used
22 */
23int notifier_add_irq(struct hvc_struct *hp, int irq)
24{
25	int rc;
26
27	if (!irq) {
28		hp->irq_requested = 0;
29		return 0;
30	}
31	rc = request_irq(irq, hvc_handle_interrupt, 0,
32			   "hvc_console", hp);
33	if (!rc)
34		hp->irq_requested = 1;
35	return rc;
36}
37
38void notifier_del_irq(struct hvc_struct *hp, int irq)
39{
40	if (!hp->irq_requested)
41		return;
42	free_irq(irq, hp);
43	hp->irq_requested = 0;
44}
45
46void notifier_hangup_irq(struct hvc_struct *hp, int irq)
47{
48	notifier_del_irq(hp, irq);
49}
50