Linux Device Drivers Development

The interrupt trigger interface

Consider the following sample:

static struct resource iio_irq_trigger_resources[] = { 
    [0] = { 
        .start = IRQ_NR_FOR_YOUR_IRQ, 
        .flags = IORESOURCE_IRQ | IORESOURCE_IRQ_LOWEDGE, 
    }, 
}; 
 
static struct platform_device iio_irq_trigger = { 
    .name = "iio_interrupt_trigger", 
    .num_resources = ARRAY_SIZE(iio_irq_trigger_resources), 
    .resource = iio_irq_trigger_resources, 
}; 
platform_device_register(&iio_irq_trigger); 

Declare our IRQ trigger and it will result in the IRQ trigger standalone module being loaded. If its probe function succeeds, there will be a directory corresponding to the trigger. IRQ trigger names have the form irqtrigX, where X corresponds to the virtual IRQ you just passed, the one you will see in /proc/interrupt ...