Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / kernel / irq / devres.c

diff --git a/kernel/kernel/irq/devres.c b/kernel/kernel/irq/devres.c
new file mode 100644 (file)
index 0000000..74d90a7
--- /dev/null
+++ b/kernel/kernel/irq/devres.c
@@ -0,0 +1,139 @@
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/gfp.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_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;
+
+       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_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 < 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);