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genirq: Add wakeup sysfs node to show IRQ wakeup state 

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
hifive-unleashed-5.1
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
Contact: Craig Gallek <kraig@google.com>
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);
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,
struct kobj_attribute *attr, char *buf)
{
@ -253,6 +269,7 @@ static struct attribute *irq_attrs[] = {
&chip_name_attr.attr,
&hwirq_attr.attr,
&type_attr.attr,
&wakeup_attr.attr,
&name_attr.attr,
&actions_attr.attr,
NULL