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286 lines
8.0 KiB
286 lines
8.0 KiB
#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/device.h>
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#include <linux/gfp.h>
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#include <linux/irq.h>
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#include "internals.h"
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/*
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* Device resource management aware IRQ request/free implementation.
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*/
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struct irq_devres {
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unsigned int irq;
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void *dev_id;
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};
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static void devm_irq_release(struct device *dev, void *res)
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{
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struct irq_devres *this = res;
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free_irq(this->irq, this->dev_id);
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}
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static int devm_irq_match(struct device *dev, void *res, void *data)
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{
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struct irq_devres *this = res, *match = data;
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return this->irq == match->irq && this->dev_id == match->dev_id;
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}
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/**
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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
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* @irq: Interrupt line to allocate
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* @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
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* for devices which handle everything in @handler
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* @irqflags: Interrupt type flags
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* @devname: An ascii name for the claiming device, dev_name(dev) if NULL
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* @dev_id: A cookie passed back to the handler function
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*
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* Except for the extra @dev argument, this function takes the
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* 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.
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*
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* 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,
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irq_handler_t handler, irq_handler_t thread_fn,
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unsigned long irqflags, const char *devname,
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void *dev_id)
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{
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struct irq_devres *dr;
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int rc;
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dr = devres_alloc(devm_irq_release, sizeof(struct irq_devres),
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GFP_KERNEL);
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if (!dr)
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return -ENOMEM;
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if (!devname)
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devname = dev_name(dev);
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rc = request_threaded_irq(irq, handler, thread_fn, irqflags, devname,
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dev_id);
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if (rc) {
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devres_free(dr);
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return rc;
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}
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dr->irq = irq;
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dr->dev_id = dev_id;
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devres_add(dev, dr);
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return 0;
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}
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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
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* @dev: device to request interrupt for
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* @irq: Interrupt line to allocate
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* @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
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* for devices which handle everything in @handler
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* @irqflags: Interrupt type flags
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* @devname: An ascii name for the claiming device, dev_name(dev) if NULL
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* @dev_id: A cookie passed back to the handler function
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*
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* Except for the extra @dev argument, this function takes the
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* same arguments and performs the same function as
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* request_any_context_irq(). IRQs requested with this function will be
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* automatically freed on driver detach.
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*
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* 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_any_context_irq(struct device *dev, unsigned int irq,
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irq_handler_t handler, unsigned long irqflags,
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const char *devname, void *dev_id)
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{
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struct irq_devres *dr;
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int rc;
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dr = devres_alloc(devm_irq_release, sizeof(struct irq_devres),
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GFP_KERNEL);
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if (!dr)
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return -ENOMEM;
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if (!devname)
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devname = dev_name(dev);
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rc = request_any_context_irq(irq, handler, irqflags, devname, dev_id);
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if (rc < 0) {
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devres_free(dr);
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return rc;
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}
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dr->irq = irq;
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dr->dev_id = dev_id;
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devres_add(dev, dr);
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return rc;
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}
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EXPORT_SYMBOL(devm_request_any_context_irq);
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/**
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* devm_free_irq - free an interrupt
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* @dev: device to free interrupt for
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* @irq: Interrupt line to free
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* @dev_id: Device identity to free
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*
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* Except for the extra @dev argument, this function takes the
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* same arguments and performs the same function as free_irq().
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* 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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*/
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void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id)
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{
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struct irq_devres match_data = { irq, dev_id };
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WARN_ON(devres_destroy(dev, devm_irq_release, devm_irq_match,
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&match_data));
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free_irq(irq, dev_id);
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}
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EXPORT_SYMBOL(devm_free_irq);
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struct irq_desc_devres {
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unsigned int from;
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unsigned int cnt;
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};
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static void devm_irq_desc_release(struct device *dev, void *res)
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{
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struct irq_desc_devres *this = res;
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irq_free_descs(this->from, this->cnt);
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}
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/**
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* __devm_irq_alloc_descs - Allocate and initialize a range of irq descriptors
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* for a managed device
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* @dev: Device to allocate the descriptors for
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* @irq: Allocate for specific irq number if irq >= 0
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* @from: Start the search from this irq number
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* @cnt: Number of consecutive irqs to allocate
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* @node: Preferred node on which the irq descriptor should be allocated
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* @owner: Owning module (can be NULL)
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* @affinity: Optional pointer to an affinity mask array of size @cnt
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* which hints where the irq descriptors should be allocated
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* and which default affinities to use
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*
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* Returns the first irq number or error code.
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*
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* Note: Use the provided wrappers (devm_irq_alloc_desc*) for simplicity.
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*/
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int __devm_irq_alloc_descs(struct device *dev, int irq, unsigned int from,
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unsigned int cnt, int node, struct module *owner,
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const struct cpumask *affinity)
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{
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struct irq_desc_devres *dr;
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int base;
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dr = devres_alloc(devm_irq_desc_release, sizeof(*dr), GFP_KERNEL);
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if (!dr)
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return -ENOMEM;
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base = __irq_alloc_descs(irq, from, cnt, node, owner, affinity);
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if (base < 0) {
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devres_free(dr);
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return base;
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}
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dr->from = base;
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dr->cnt = cnt;
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devres_add(dev, dr);
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return base;
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}
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EXPORT_SYMBOL_GPL(__devm_irq_alloc_descs);
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#ifdef CONFIG_GENERIC_IRQ_CHIP
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/**
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* devm_irq_alloc_generic_chip - Allocate and initialize a generic chip
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* for a managed device
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* @dev: Device to allocate the generic chip for
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* @name: Name of the irq chip
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* @num_ct: Number of irq_chip_type instances associated with this
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* @irq_base: Interrupt base nr for this chip
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* @reg_base: Register base address (virtual)
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* @handler: Default flow handler associated with this chip
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*
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* Returns an initialized irq_chip_generic structure. The chip defaults
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* to the primary (index 0) irq_chip_type and @handler
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*/
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struct irq_chip_generic *
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devm_irq_alloc_generic_chip(struct device *dev, const char *name, int num_ct,
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unsigned int irq_base, void __iomem *reg_base,
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irq_flow_handler_t handler)
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{
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struct irq_chip_generic *gc;
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unsigned long sz = sizeof(*gc) + num_ct * sizeof(struct irq_chip_type);
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gc = devm_kzalloc(dev, sz, GFP_KERNEL);
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if (gc)
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irq_init_generic_chip(gc, name, num_ct,
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irq_base, reg_base, handler);
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return gc;
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}
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EXPORT_SYMBOL_GPL(devm_irq_alloc_generic_chip);
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struct irq_generic_chip_devres {
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struct irq_chip_generic *gc;
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u32 msk;
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unsigned int clr;
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unsigned int set;
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};
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static void devm_irq_remove_generic_chip(struct device *dev, void *res)
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{
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struct irq_generic_chip_devres *this = res;
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irq_remove_generic_chip(this->gc, this->msk, this->clr, this->set);
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}
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/**
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* devm_irq_setup_generic_chip - Setup a range of interrupts with a generic
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* chip for a managed device
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*
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* @dev: Device to setup the generic chip for
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* @gc: Generic irq chip holding all data
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* @msk: Bitmask holding the irqs to initialize relative to gc->irq_base
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* @flags: Flags for initialization
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* @clr: IRQ_* bits to clear
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* @set: IRQ_* bits to set
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*
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* Set up max. 32 interrupts starting from gc->irq_base. Note, this
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* initializes all interrupts to the primary irq_chip_type and its
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* associated handler.
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*/
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int devm_irq_setup_generic_chip(struct device *dev, struct irq_chip_generic *gc,
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u32 msk, enum irq_gc_flags flags,
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unsigned int clr, unsigned int set)
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{
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struct irq_generic_chip_devres *dr;
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dr = devres_alloc(devm_irq_remove_generic_chip,
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sizeof(*dr), GFP_KERNEL);
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if (!dr)
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return -ENOMEM;
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irq_setup_generic_chip(gc, msk, flags, clr, set);
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dr->gc = gc;
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dr->msk = msk;
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dr->clr = clr;
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dr->set = set;
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devres_add(dev, dr);
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return 0;
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}
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EXPORT_SYMBOL_GPL(devm_irq_setup_generic_chip);
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#endif /* CONFIG_GENERIC_IRQ_CHIP */
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