Release 4.11 kernel/irq/devres.c

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/gfp.h>
#include <linux/irq.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);
}

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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
 *      @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_name(dev) if NULL
 *      @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_threaded_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_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),
			  GFP_KERNEL);
	if (!dr)
		return -ENOMEM;

	if (!devname)
		devname = dev_name(dev);

	rc = request_threaded_irq(irq, handler, thread_fn, 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;
}
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EXPORT_SYMBOL(devm_request_threaded_irq);

/**
 *      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_name(dev) if NULL
 *      @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;

	if (!devname)
		devname = dev_name(dev);

	rc = request_any_context_irq(irq, handler, irqflags, devname, dev_id);
	if (rc < 0) {
		devres_free(dr);
		return rc;
	}

	dr->irq = irq;
	dr->dev_id = dev_id;
	devres_add(dev, dr);

	return rc;
}
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EXPORT_SYMBOL(devm_request_any_context_irq);

/**
 *      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 devm_request_irq().
 */


void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id)
{
	struct irq_devres match_data = { irq, dev_id };

	WARN_ON(devres_destroy(dev, devm_irq_release, devm_irq_match,
			       &match_data));
	free_irq(irq, dev_id);
}
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EXPORT_SYMBOL(devm_free_irq);


struct irq_desc_devres {
	
unsigned int from;
	
unsigned int cnt;
};



static void devm_irq_desc_release(struct device *dev, void *res)
{
	struct irq_desc_devres *this = res;

	irq_free_descs(this->from, this->cnt);
}

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/**
 * __devm_irq_alloc_descs - Allocate and initialize a range of irq descriptors
 *                          for a managed device
 * @dev:        Device to allocate the descriptors for
 * @irq:        Allocate for specific irq number if irq >= 0
 * @from:       Start the search from this irq number
 * @cnt:        Number of consecutive irqs to allocate
 * @node:       Preferred node on which the irq descriptor should be allocated
 * @owner:      Owning module (can be NULL)
 * @affinity:   Optional pointer to an affinity mask array of size @cnt
 *              which hints where the irq descriptors should be allocated
 *              and which default affinities to use
 *
 * Returns the first irq number or error code.
 *
 * Note: Use the provided wrappers (devm_irq_alloc_desc*) for simplicity.
 */


int __devm_irq_alloc_descs(struct device *dev, int irq, unsigned int from,
			   unsigned int cnt, int node, struct module *owner,
			   const struct cpumask *affinity)
{
	struct irq_desc_devres *dr;
	int base;

	dr = devres_alloc(devm_irq_desc_release, sizeof(*dr), GFP_KERNEL);
	if (!dr)
		return -ENOMEM;

	base = __irq_alloc_descs(irq, from, cnt, node, owner, affinity);
	if (base < 0) {
		devres_free(dr);
		return base;
	}

	dr->from = base;
	dr->cnt = cnt;
	devres_add(dev, dr);

	return base;
}
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EXPORT_SYMBOL_GPL(__devm_irq_alloc_descs);
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Directory: kernel/irq

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