tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
18 /*
19 * We're safe to always return IRQ_HANDLED as the hvcd thread will
20 * iterate through each hvc_struct.
21 */
22 return IRQ_HANDLED;
23}
24
25/*
26 * For IRQ based systems these callbacks can be used
27 */
28int notifier_add_irq(struct hvc_struct *hp, int irq)
29{
30 int rc;
31
32 if (!irq) {
33 hp->irq_requested = 0;
34 return 0;
35 }
36 rc = request_irq(irq, hvc_handle_interrupt, hp->flags,
37 "hvc_console", hp);
38 if (!rc)
39 hp->irq_requested = 1;
40 return rc;
41}
42
43void notifier_del_irq(struct hvc_struct *hp, int irq)
44{
45 if (!hp->irq_requested)
46 return;
47 free_irq(irq, hp);
48 hp->irq_requested = 0;
49}
50
51void notifier_hangup_irq(struct hvc_struct *hp, int irq)
52{
53 notifier_del_irq(hp, irq);
54}