blob: d06df9c41cba2cf4aee477737e341ad98d6c1493 [file] [log] [blame]
#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_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_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),
if (!dr)
return -ENOMEM;
rc = request_threaded_irq(irq, handler, thread_fn, irqflags, devname,
if (rc) {
return rc;
dr->irq = irq;
dr->dev_id = dev_id;
devres_add(dev, dr);
return 0;
* 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,