[patch]GPIO button is supposed to wake the system up if the wakeup attribute is set

["Li, Aubrey" <aubrey.li@linux.intel.com>]

When the wakeup attribute is set, GPIO button is supposed to set
irqflag - IRQF_NO_SUSPEND to request irq. So when the system enters
the suspend sleep mode, the GPIO irq keeps enabled and is able to
wake the system up.

The affected/tested machines include Dell Venue 11 Pro and Asus T100TA.

Signed-off-by: Aubrey Li <aubrey.li@linux.intel.com>
---
 drivers/input/keyboard/gpio_keys.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 2db1324..40f3963 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -503,6 +503,9 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
 	if (!button->can_disable)
 		irqflags |= IRQF_SHARED;
 
+	if (button->wakeup)
+		irqflags |= IRQF_NO_SUSPEND;
+
 	error = request_any_context_irq(bdata->irq, isr, irqflags, desc, bdata);
 	if (error < 0) {
 		dev_err(dev, "Unable to claim irq %d; error %d\n",
-- 
1.7.10.4