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kernel/irq/devres.c
3.95 KB
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#include <linux/module.h> #include <linux/interrupt.h> |
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#include <linux/device.h> |
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#include <linux/gfp.h> |
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/* * 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; } /** |
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* devm_request_threaded_irq - allocate an interrupt line for a managed device |
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* @dev: device to request interrupt for * @irq: Interrupt line to allocate * @handler: Function to be called when the IRQ occurs |
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* @thread_fn: function to be called in a threaded interrupt context. NULL * for devices which handle everything in @handler |
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* @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 |
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* request_threaded_irq(). IRQs requested with this function will be |
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* automatically freed on driver detach. * * If an IRQ allocated with this function needs to be freed |
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* separately, devm_free_irq() must be used. |
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*/ |
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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) |
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{ struct irq_devres *dr; int rc; dr = devres_alloc(devm_irq_release, sizeof(struct irq_devres), GFP_KERNEL); if (!dr) return -ENOMEM; |
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rc = request_threaded_irq(irq, handler, thread_fn, irqflags, devname, dev_id); |
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if (rc) { |
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devres_free(dr); |
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return rc; } dr->irq = irq; dr->dev_id = dev_id; devres_add(dev, dr); return 0; } |
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EXPORT_SYMBOL(devm_request_threaded_irq); |
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/** |
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* devm_request_any_context_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_any_context_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, devm_free_irq() must be used. */ int devm_request_any_context_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_any_context_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_any_context_irq); /** |
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* 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 |
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* free IRQs allocated with devm_request_irq(). |
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*/ void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id) { struct irq_devres match_data = { irq, dev_id }; |
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WARN_ON(devres_destroy(dev, devm_irq_release, devm_irq_match, &match_data)); |
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free_irq(irq, dev_id); |
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} EXPORT_SYMBOL(devm_free_irq); |