1 #include <linux/module.h>
2 #include <linux/interrupt.h>
3 #include <linux/device.h>
7 * Device resource management aware IRQ request/free implementation.
14 static void devm_irq_release(struct device *dev, void *res)
16 struct irq_devres *this = res;
18 free_irq(this->irq, this->dev_id);
21 static int devm_irq_match(struct device *dev, void *res, void *data)
23 struct irq_devres *this = res, *match = data;
25 return this->irq == match->irq && this->dev_id == match->dev_id;
29 * devm_request_irq - allocate an interrupt line for a managed device
30 * @dev: device to request interrupt for
31 * @irq: Interrupt line to allocate
32 * @handler: Function to be called when the IRQ occurs
33 * @irqflags: Interrupt type flags
34 * @devname: An ascii name for the claiming device
35 * @dev_id: A cookie passed back to the handler function
37 * Except for the extra @dev argument, this function takes the
38 * same arguments and performs the same function as
39 * request_irq(). IRQs requested with this function will be
40 * automatically freed on driver detach.
42 * If an IRQ allocated with this function needs to be freed
43 * separately, dev_free_irq() must be used.
45 int devm_request_irq(struct device *dev, unsigned int irq,
46 irq_handler_t handler, unsigned long irqflags,
47 const char *devname, void *dev_id)
49 struct irq_devres *dr;
52 dr = devres_alloc(devm_irq_release, sizeof(struct irq_devres),
57 rc = request_irq(irq, handler, irqflags, devname, dev_id);
69 EXPORT_SYMBOL(devm_request_irq);
72 * devm_free_irq - free an interrupt
73 * @dev: device to free interrupt for
74 * @irq: Interrupt line to free
75 * @dev_id: Device identity to free
77 * Except for the extra @dev argument, this function takes the
78 * same arguments and performs the same function as free_irq().
79 * This function instead of free_irq() should be used to manually
80 * free IRQs allocated with dev_request_irq().
82 void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id)
84 struct irq_devres match_data = { irq, dev_id };
86 free_irq(irq, dev_id);
87 WARN_ON(devres_destroy(dev, devm_irq_release, devm_irq_match,
90 EXPORT_SYMBOL(devm_free_irq);