1 #include <linux/module.h>
2 #include <linux/interrupt.h>
3 #include <linux/device.h>
4 #include <linux/gfp.h>
5
6 /*
7 * Device resource management aware IRQ request/free implementation.
8 */
9 struct irq_devres {
10 unsigned int irq;
11 void *dev_id;
12 };
13
devm_irq_release(struct device * dev,void * res)14 static void devm_irq_release(struct device *dev, void *res)
15 {
16 struct irq_devres *this = res;
17
18 free_irq(this->irq, this->dev_id);
19 }
20
devm_irq_match(struct device * dev,void * res,void * data)21 static int devm_irq_match(struct device *dev, void *res, void *data)
22 {
23 struct irq_devres *this = res, *match = data;
24
25 return this->irq == match->irq && this->dev_id == match->dev_id;
26 }
27
28 /**
29 * devm_request_threaded_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 * @thread_fn: function to be called in a threaded interrupt context. NULL
34 * for devices which handle everything in @handler
35 * @irqflags: Interrupt type flags
36 * @devname: An ascii name for the claiming device
37 * @dev_id: A cookie passed back to the handler function
38 *
39 * Except for the extra @dev argument, this function takes the
40 * same arguments and performs the same function as
41 * request_irq(). IRQs requested with this function will be
42 * automatically freed on driver detach.
43 *
44 * If an IRQ allocated with this function needs to be freed
45 * separately, devm_free_irq() must be used.
46 */
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)47 int devm_request_threaded_irq(struct device *dev, unsigned int irq,
48 irq_handler_t handler, irq_handler_t thread_fn,
49 unsigned long irqflags, const char *devname,
50 void *dev_id)
51 {
52 struct irq_devres *dr;
53 int rc;
54
55 dr = devres_alloc(devm_irq_release, sizeof(struct irq_devres),
56 GFP_KERNEL);
57 if (!dr)
58 return -ENOMEM;
59
60 rc = request_threaded_irq(irq, handler, thread_fn, irqflags, devname,
61 dev_id);
62 if (rc) {
63 devres_free(dr);
64 return rc;
65 }
66
67 dr->irq = irq;
68 dr->dev_id = dev_id;
69 devres_add(dev, dr);
70
71 return 0;
72 }
73 EXPORT_SYMBOL(devm_request_threaded_irq);
74
75 /**
76 * devm_free_irq - free an interrupt
77 * @dev: device to free interrupt for
78 * @irq: Interrupt line to free
79 * @dev_id: Device identity to free
80 *
81 * Except for the extra @dev argument, this function takes the
82 * same arguments and performs the same function as free_irq().
83 * This function instead of free_irq() should be used to manually
84 * free IRQs allocated with devm_request_irq().
85 */
devm_free_irq(struct device * dev,unsigned int irq,void * dev_id)86 void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id)
87 {
88 struct irq_devres match_data = { irq, dev_id };
89
90 WARN_ON(devres_destroy(dev, devm_irq_release, devm_irq_match,
91 &match_data));
92 free_irq(irq, dev_id);
93 }
94 EXPORT_SYMBOL(devm_free_irq);
95