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genirq: Add wakeup sysfs node to show IRQ wakeup state

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Surprisingly there is no simple way to see if the IRQ line in question
is wakeup source or not.

Note that wakeup might be an OOB (out-of-band) source like GPIO line
which makes things slightly more complicated.

Add a sysfs node to cover this case.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Tony Lindgren <tony@atomide.com>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>
Link: https://lkml.kernel.org/r/20180226155043.67937-1-andriy.shevchenko@linux.intel.com
This commit is contained in:
Andy Shevchenko 2018-02-26 17:50:43 +02:00 committed by Thomas Gleixner
parent e69c61dd05
commit d61e2944b6
2 changed files with 24 additions and 0 deletions
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7
Documentation/ABI/testing/sysfs-kernel-irq
View File

@ -51,3 +51,10 @@ Date: September 2016
KernelVersion: 4.9 KernelVersion: 4.9
Contact: Craig Gallek <kraig@google.com> Contact: Craig Gallek <kraig@google.com>
Description: The type of the interrupt. Either the string 'level' or 'edge'. Description: The type of the interrupt. Either the string 'level' or 'edge'.
What: /sys/kernel/irq/<irq>/wakeup
Date: March 2018
KernelVersion: 4.17
Contact: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Description: The wakeup state of the interrupt. Either the string
'enabled' or 'disabled'.

17
kernel/irq/irqdesc.c
View File

@ -210,6 +210,22 @@ static ssize_t type_show(struct kobject *kobj,
} }
IRQ_ATTR_RO(type); IRQ_ATTR_RO(type);
static ssize_t wakeup_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
ssize_t ret = 0;
raw_spin_lock_irq(&desc->lock);
ret = sprintf(buf, "%s\n",
irqd_is_wakeup_set(&desc->irq_data) ? "enabled" : "disabled");
raw_spin_unlock_irq(&desc->lock);
return ret;
}
IRQ_ATTR_RO(wakeup);
static ssize_t name_show(struct kobject *kobj, static ssize_t name_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf) struct kobj_attribute *attr, char *buf)
{ {
@ -253,6 +269,7 @@ static struct attribute *irq_attrs[] = {
&chip_name_attr.attr, &chip_name_attr.attr,
&hwirq_attr.attr, &hwirq_attr.attr,
&type_attr.attr, &type_attr.attr,
&wakeup_attr.attr,
&name_attr.attr, &name_attr.attr,
&actions_attr.attr, &actions_attr.attr,
NULL NULL