diff options
| author | Thierry Reding <treding@nvidia.com> | 2019-08-28 10:34:10 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-08-28 22:52:30 +0200 |
| commit | 8973ea47901c81a1912bd05f1577bed9b5b52506 (patch) | |
| tree | 34d0e1f2aae4bbe29058afc9ee966ac00f30a821 | |
| parent | bfb3943bed670a0655aa2f9dcf82222ff09d6dd1 (diff) | |
| download | linux-8973ea47901c81a1912bd05f1577bed9b5b52506.tar.gz | |
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: Thierry Reding <treding@nvidia.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20190828083411.2496-1-thierry.reding@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/base/platform.c | 22 | ||||
| -rw-r--r-- | include/linux/platform_device.h | 1 |
2 files changed, 23 insertions, 0 deletions
diff --git a/drivers/base/platform.c b/drivers/base/platform.c index 8ad701068c11..0dda6ade50fd 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -193,6 +193,28 @@ 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 * diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h index 37e15a935a42..35bc4355a9df 100644 --- a/include/linux/platform_device.h +++ b/include/linux/platform_device.h @@ -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, |