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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
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What: /sys/kernel/irq Date: September 2016 KernelVersion: 4.9 Contact: Craig Gallek kraig@google.com Description: Directory containing information about the system's IRQs. Specifically, data from the associated struct irq_desc. The information here is similar to that in /proc/interrupts but in a more machine-friendly format. This directory contains one subdirectory for each Linux IRQ number.
What: /sys/kernel/irq//actions Date: September 2016 KernelVersion: 4.9 Contact: Craig Gallek kraig@google.com Description: The IRQ action chain. A comma-separated list of zero or more device names associated with this interrupt.
What: /sys/kernel/irq//chip_name Date: September 2016 KernelVersion: 4.9 Contact: Craig Gallek kraig@google.com Description: Human-readable chip name supplied by the associated device driver.
What: /sys/kernel/irq//hwirq Date: September 2016 KernelVersion: 4.9 Contact: Craig Gallek kraig@google.com Description: When interrupt translation domains are used, this file contains the underlying hardware IRQ number used for this Linux IRQ.
What: /sys/kernel/irq//name Date: September 2016 KernelVersion: 4.9 Contact: Craig Gallek kraig@google.com Description: Human-readable flow handler name as defined by the irq chip driver.
What: /sys/kernel/irq//per_cpu_count Date: September 2016 KernelVersion: 4.9 Contact: Craig Gallek kraig@google.com Description: The number of times the interrupt has fired since boot. This is a comma-separated list of counters; one per CPU in CPU id order. NOTE: This file consistently shows counters for all CPU ids. This differs from the behavior of /proc/interrupts which only shows counters for online CPUs.
What: /sys/kernel/irq//type 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//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'.