1 /*
2 * linux/kernel/irq/pm.c
3 *
4 * Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
5 *
6 * This file contains power management functions related to interrupts.
7 */
8
9 #include <linux/irq.h>
10 #include <linux/module.h>
11 #include <linux/interrupt.h>
12
13 #include "internals.h"
14
15 /**
16 * suspend_device_irqs - disable all currently enabled interrupt lines
17 *
18 * During system-wide suspend or hibernation device interrupts need to be
19 * disabled at the chip level and this function is provided for this purpose.
20 * It disables all interrupt lines that are enabled at the moment and sets the
21 * IRQ_SUSPENDED flag for them.
22 */
23 void suspend_device_irqs(void)
24 {
25 struct irq_desc *desc;
26 int irq;
27
28 for_each_irq_desc(irq, desc) {
29 unsigned long flags;
30
31 spin_lock_irqsave(&desc->lock, flags);
32 __disable_irq(desc, irq, true);
33 spin_unlock_irqrestore(&desc->lock, flags);
34 }
35
36 for_each_irq_desc(irq, desc)
37 if (desc->status & IRQ_SUSPENDED)
38 synchronize_irq(irq);
39 }
40 EXPORT_SYMBOL_GPL(suspend_device_irqs);
41
42 /**
43 * resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs()
44 *
45 * Enable all interrupt lines previously disabled by suspend_device_irqs() that
46 * have the IRQ_SUSPENDED flag set.
47 */
48 void resume_device_irqs(void)
49 {
50 struct irq_desc *desc;
51 int irq;
52
53 for_each_irq_desc(irq, desc) {
54 unsigned long flags;
55
56 if (!(desc->status & IRQ_SUSPENDED))
57 continue;
58
59 spin_lock_irqsave(&desc->lock, flags);
60 __enable_irq(desc, irq, true);
61 spin_unlock_irqrestore(&desc->lock, flags);
62 }
63 }
64 EXPORT_SYMBOL_GPL(resume_device_irqs);
65
66 /**
67 * check_wakeup_irqs - check if any wake-up interrupts are pending
68 */
69 int check_wakeup_irqs(void)
70 {
71 struct irq_desc *desc;
72 int irq;
73
74 for_each_irq_desc(irq, desc)
75 if ((desc->status & IRQ_WAKEUP) && (desc->status & IRQ_PENDING))
76 return -EBUSY;
77
78 return 0;
79 }
80
|
This page was automatically generated by the
LXR engine.
|