#include <linux/module.h>#include <linux/interrupt.h>#include <linux/device.h>#include <linux/gfp.h> /* * Device resource management aware IRQ request/free implementation. */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;} /** *	devm_request_threaded_irq - allocate an interrupt line for a managed device *	@dev: device to request interrupt for *	@irq: Interrupt line to allocate *	@handler: Function to be called when the IRQ occurs *	@thread_fn: function to be called in a threaded interrupt context. NULL *		    for devices which handle everything in @handler *	@irqflags: Interrupt type flags *	@devname: An ascii name for the claiming device *	@dev_id: A cookie passed back to the handler function * *	Except for the extra @dev argument, this function takes the *	same arguments and performs the same function as *	request_threaded_irq().  IRQs requested with this function will be *	automatically freed on driver detach. * *	If an IRQ allocated with this function needs to be freed *	separately, devm_free_irq() must be used. */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); /** *	devm_request_any_context_irq - allocate an interrupt line for a managed device *	@dev: device to request interrupt for *	@irq: Interrupt line to allocate *	@handler: Function to be called when the IRQ occurs *	@thread_fn: function to be called in a threaded interrupt context. NULL *		    for devices which handle everything in @handler *	@irqflags: Interrupt type flags *	@devname: An ascii name for the claiming device *	@dev_id: A cookie passed back to the handler function * *	Except for the extra @dev argument, this function takes the *	same arguments and performs the same function as *	request_any_context_irq().  IRQs requested with this function will be *	automatically freed on driver detach. * *	If an IRQ allocated with this function needs to be freed *	separately, devm_free_irq() must be used. */int devm_request_any_context_irq(struct device *dev, unsigned int irq,			      irq_handler_t handler, 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_any_context_irq(irq, handler, irqflags, devname, dev_id);	if (rc < 0) {		devres_free(dr);		return rc;	} 	dr->irq = irq;	dr->dev_id = dev_id;	devres_add(dev, dr); 	return rc;}EXPORT_SYMBOL(devm_request_any_context_irq); /** *	devm_free_irq - free an interrupt *	@dev: device to free interrupt for *	@irq: Interrupt line to free *	@dev_id: Device identity to free * *	Except for the extra @dev argument, this function takes the *	same arguments and performs the same function as free_irq(). *	This function instead of free_irq() should be used to manually *	free IRQs allocated with devm_request_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);