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#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);
}
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;
}
/**
* 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;
}
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;
}
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);
}
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);
}
/**
* __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;
}
EXPORT_SYMBOL_GPL(__devm_irq_alloc_descs);
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