#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/gfp.h>

struct irq_devres {
	unsigned int irq;
	void *dev_id;
};

static void devm_irq_release(struct device *dev, void *res)
{
	struct irq_devres *this = res;

	free_irq(this->irq, this->dev_id);
}

static int devm_irq_match(struct device *dev, void *res, void *data)
{
	struct irq_devres *this = res, *match = data;

	return this->irq == match->irq && this->dev_id == match->dev_id;
}

int devm_request_threaded_irq(struct device *dev, unsigned int irq,
			      irq_handler_t handler, irq_handler_t thread_fn,
			      unsigned long irqflags, const char *devname,
			      void *dev_id)
{
	struct irq_devres *dr;
	int rc;

	dr = devres_alloc(devm_irq_release, sizeof(struct irq_devres),
			  GFP_KERNEL);
	if (!dr)
		return -ENOMEM;

	rc = request_threaded_irq(irq, handler, thread_fn, irqflags, devname,
				  dev_id);
	if (rc) {
		devres_free(dr);
		return rc;
	}

	dr->irq = irq;
	dr->dev_id = dev_id;
	devres_add(dev, dr);

	return 0;
}
EXPORT_SYMBOL(devm_request_threaded_irq);

void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id)
{
	struct irq_devres match_data = { irq, dev_id };

	WARN_ON(devres_destroy(dev, devm_irq_release, devm_irq_match,
			       &match_data));
	free_irq(irq, dev_id);
}
EXPORT_SYMBOL(devm_free_irq);