Commit 8973ea47 authored by Thierry Reding's avatar Thierry Reding Committed by Greg Kroah-Hartman
Browse files

driver core: platform: Introduce platform_get_irq_optional() 



In some cases the interrupt line of a device is optional. Introduce a
new platform_get_irq_optional() that works much like platform_get_irq()
but does not output an error on failure to find the interrupt.

Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
Reviewed-by: default avatarStephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20190828083411.2496-1-thierry.reding@gmail.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent bfb3943b

drivers/base/platform.c

+22 −0
Original line number Diff line number Diff line
@@ -192,6 +192,28 @@ int platform_get_irq(struct platform_device *dev, unsigned int num) 
}

EXPORT_SYMBOL_GPL(platform_get_irq);



/**

 * platform_get_irq_optional - get an optional IRQ for a device

 * @dev: platform device

 * @num: IRQ number index

 *

 * Gets an IRQ for a platform device. Device drivers should check the return

 * value for errors so as to not pass a negative integer value to the

 * request_irq() APIs. This is the same as platform_get_irq(), except that it

 * does not print an error message if an IRQ can not be obtained.

 *

 * Example:

 *		int irq = platform_get_irq_optional(pdev, 0);

 *		if (irq < 0)

 *			return irq;

 *

 * Return: IRQ number on success, negative error number on failure.

 */

int platform_get_irq_optional(struct platform_device *dev, unsigned int num)

{

	return __platform_get_irq(dev, num);

}



/**

 * platform_irq_count - Count the number of IRQs a platform device uses

 * @dev: platform device

include/linux/platform_device.h

+1 −0
Original line number Diff line number Diff line
@@ -58,6 +58,7 @@ extern void __iomem * 
devm_platform_ioremap_resource(struct platform_device *pdev,

			       unsigned int index);

extern int platform_get_irq(struct platform_device *, unsigned int);

extern int platform_get_irq_optional(struct platform_device *, unsigned int);

extern int platform_irq_count(struct platform_device *);

extern struct resource *platform_get_resource_byname(struct platform_device *,

						     unsigned int,

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