| 1 | #include <linux/module.h>
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| 2 | #include <linux/interrupt.h>
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| 3 |
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| 4 | |
| 5 | * Device resource management aware IRQ request/free implementation.
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| 6 |
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| 7 | struct irq_devres {
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| 8 | unsigned int irq;
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| 9 | void *dev_id;
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| 10 | };
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| 11 |
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| 12 | static void devm_irq_release(struct device *dev, void *res)
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| 13 | {
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| 14 | struct irq_devres *this = res;
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| 15 |
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| 16 | free_irq(this->irq, this->dev_id);
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| 17 | }
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| 18 |
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| 19 | static int devm_irq_match(struct device *dev, void *res, void *data)
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| 20 | {
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| 21 | struct irq_devres *this = res, *match = data;
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| 22 |
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| 23 | return this->irq == match->irq && this->dev_id == match->dev_id;
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| 24 | }
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| 25 |
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| 26 | |
| 27 | * devm_request_irq - allocate an interrupt line for a managed device
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| 28 | * @dev: device to request interrupt for
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| 29 | * @irq: Interrupt line to allocate
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| 30 | * @handler: Function to be called when the IRQ occurs
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| 31 | * @irqflags: Interrupt type flags
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| 32 | * @devname: An ascii name for the claiming device
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| 33 | * @dev_id: A cookie passed back to the handler function
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| 34 | *
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| 35 | * Except for the extra @dev argument, this function takes the
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| 36 | * same arguments and performs the same function as
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| 37 | * request_irq(). IRQs requested with this function will be
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| 38 | * automatically freed on driver detach.
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| 39 | *
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| 40 | * If an IRQ allocated with this function needs to be freed
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| 41 | * separately, dev_free_irq() must be used.
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| 42 |
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| 43 | int devm_request_irq(struct device *dev, unsigned int irq,
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| 44 | irq_handler_t handler, unsigned long irqflags,
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| 45 | const char *devname, void *dev_id)
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| 46 | {
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| 47 | struct irq_devres *dr;
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| 48 | int rc;
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| 49 |
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| 50 | dr = devres_alloc(devm_irq_release, sizeof(struct irq_devres),
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| 51 | GFP_KERNEL);
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| 52 | if (!dr)
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| 53 | return -ENOMEM;
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| 54 |
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| 55 | rc = request_irq(irq, handler, irqflags, devname, dev_id);
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| 56 | if (rc) {
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| 57 | devres_free(dr);
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| 58 | return rc;
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| 59 | }
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| 60 |
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| 61 | dr->irq = irq;
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| 62 | dr->dev_id = dev_id;
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| 63 | devres_add(dev, dr);
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| 64 |
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| 65 | return 0;
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| 66 | }
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| 67 | EXPORT_SYMBOL(devm_request_irq);
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| 68 |
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| 69 | |
| 70 | * devm_free_irq - free an interrupt
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| 71 | * @dev: device to free interrupt for
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| 72 | * @irq: Interrupt line to free
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| 73 | * @dev_id: Device identity to free
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| 74 | *
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| 75 | * Except for the extra @dev argument, this function takes the
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| 76 | * same arguments and performs the same function as free_irq().
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| 77 | * This function instead of free_irq() should be used to manually
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| 78 | * free IRQs allocated with dev_request_irq().
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| 79 |
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| 80 | void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id)
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| 81 | {
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| 82 | struct irq_devres match_data = { irq, dev_id };
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| 83 |
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| 84 | free_irq(irq, dev_id);
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| 85 | WARN_ON(devres_destroy(dev, devm_irq_release, devm_irq_match,
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| 86 | &match_data));
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| 87 | }
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| 88 | EXPORT_SYMBOL(devm_free_irq);
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