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genirq/irq_sim: Add a devres variant of irq_sim_init() 

Add a resource managed version of irq_sim_init(). This can be
conveniently used in device drivers.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-doc@vger.kernel.org
Cc: linux-gpio@vger.kernel.org
Cc: Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
Cc: Jonathan Cameron <jic23@kernel.org>
Link: http://lkml.kernel.org/r/20170814145318.6495-3-brgl@bgdev.pl
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Bartosz Golaszewski 2017-08-14 16:53:17 +02:00 committed by Thomas Gleixner
parent b19af510e6
commit 44e72c7ebf
3 changed files with 47 additions and 0 deletions
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1
Documentation/driver-model/devres.txt
View File

@ -312,6 +312,7 @@ IRQ
devm_irq_alloc_descs_from()
devm_irq_alloc_generic_chip()
devm_irq_setup_generic_chip()
devm_irq_sim_init()
LED
devm_led_classdev_register()

3
include/linux/irq_sim.h
View File

@ -10,6 +10,7 @@
*/
#include <linux/irq_work.h>
#include <linux/device.h>
/*
* Provides a framework for allocating simulated interrupts which can be
@ -34,6 +35,8 @@ struct irq_sim {
};
int irq_sim_init(struct irq_sim *sim, unsigned int num_irqs);
int devm_irq_sim_init(struct device *dev, struct irq_sim *sim,
unsigned int num_irqs);
void irq_sim_fini(struct irq_sim *sim);
void irq_sim_fire(struct irq_sim *sim, unsigned int offset);
int irq_sim_irqnum(struct irq_sim *sim, unsigned int offset);

43
kernel/irq/irq_sim.c
View File

@ -10,6 +10,10 @@
#include <linux/irq_sim.h>
#include <linux/irq.h>
struct irq_sim_devres {
struct irq_sim *sim;
};
static void irq_sim_irqmask(struct irq_data *data)
{
struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data);
@ -92,6 +96,45 @@ void irq_sim_fini(struct irq_sim *sim)
}
EXPORT_SYMBOL_GPL(irq_sim_fini);
static void devm_irq_sim_release(struct device *dev, void *res)
{
struct irq_sim_devres *this = res;
irq_sim_fini(this->sim);
}
/**
* irq_sim_init - Initialize the interrupt simulator for a managed device.
*
* @dev: Device to initialize the simulator object for.
* @sim: The interrupt simulator object to initialize.
* @num_irqs: Number of interrupts to allocate
*
* Returns 0 on success and a negative error number on failure.
*/
int devm_irq_sim_init(struct device *dev, struct irq_sim *sim,
unsigned int num_irqs)
{
struct irq_sim_devres *dr;
int rv;
dr = devres_alloc(devm_irq_sim_release, sizeof(*dr), GFP_KERNEL);
if (!dr)
return -ENOMEM;
rv = irq_sim_init(sim, num_irqs);
if (rv) {
devres_free(dr);
return rv;
}
dr->sim = sim;
devres_add(dev, dr);
return 0;
}
EXPORT_SYMBOL_GPL(devm_irq_sim_init);
/**
* irq_sim_fire - Enqueue an interrupt.
*