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#include <linux/module.h>

#include <linux/interrupt.h>

#include <linux/device.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_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

 *      @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_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, dev_free_irq() must be used.

 */

int devm_request_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_irq(irq, handler, 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_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 dev_request_irq().

 */

void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id)

{

        struct irq_devres match_data = { irq, dev_id };

        free_irq(irq, dev_id);

        WARN_ON(devres_destroy(dev, devm_irq_release, devm_irq_match,

                               &match_data));

}

EXPORT_SYMBOL(devm_free_irq);