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authorThierry Reding <treding@nvidia.com>2019-08-28 10:34:10 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-08-28 22:52:30 +0200
commit8973ea47901c81a1912bd05f1577bed9b5b52506 (patch)
tree34d0e1f2aae4bbe29058afc9ee966ac00f30a821 /drivers/base
parentRevert "driver core: Add support for linking devices during device addition" (diff)
downloadlinux-8973ea47901c81a1912bd05f1577bed9b5b52506.tar.xz
linux-8973ea47901c81a1912bd05f1577bed9b5b52506.zip
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>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/platform.c22
1 files changed, 22 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
*