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
hvc_handle_interrupt(int irq,void * dev_instance)12 static 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 */
notifier_add_irq(struct hvc_struct * hp,int irq)23 int 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, IRQF_DISABLED,
32 "hvc_console", hp);
33 if (!rc)
34 hp->irq_requested = 1;
35 return rc;
36 }
37
notifier_del_irq(struct hvc_struct * hp,int irq)38 void 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
notifier_hangup_irq(struct hvc_struct * hp,int irq)46 void notifier_hangup_irq(struct hvc_struct *hp, int irq)
47 {
48 notifier_del_irq(hp, irq);
49 }
50