[PATCH] input: sun4i-lradc-keys - Add wakup support

[Samuel Holland]

From: Ondrej Jirman <megous@xxxxxxxxxx>

Allow the driver to wake up the system on key press. Since using the
LRADC as a wakeup source requires keeping on an additional power domain,
disable the wakeup source by default.

Signed-off-by: Ondrej Jirman <megous@xxxxxxxxxx>
[Samuel: disable the wakeup source by default]
Signed-off-by: Samuel Holland <samuel@xxxxxxxxxxxx>
---
 drivers/input/keyboard/sun4i-lradc-keys.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/input/keyboard/sun4i-lradc-keys.c b/drivers/input/keyboard/sun4i-lradc-keys.c
index 4a796bed48ac..4d0e8879a97d 100644
--- a/drivers/input/keyboard/sun4i-lradc-keys.c
+++ b/drivers/input/keyboard/sun4i-lradc-keys.c
@@ -22,6 +22,8 @@
 #include <linux/module.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
+#include <linux/pm_wakeirq.h>
+#include <linux/pm_wakeup.h>
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 
@@ -226,8 +228,7 @@ static int sun4i_lradc_probe(struct platform_device *pdev)
 {
 	struct sun4i_lradc_data *lradc;
 	struct device *dev = &pdev->dev;
-	int i;
-	int error;
+	int error, i, irq;
 
 	lradc = devm_kzalloc(dev, sizeof(struct sun4i_lradc_data), GFP_KERNEL);
 	if (!lradc)
@@ -272,8 +273,13 @@ static int sun4i_lradc_probe(struct platform_device *pdev)
 	if (IS_ERR(lradc->base))
 		return PTR_ERR(lradc->base);
 
-	error = devm_request_irq(dev, platform_get_irq(pdev, 0),
-				 sun4i_lradc_irq, 0,
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(&pdev->dev, "Failed to get IRQ\n");
+		return irq;
+	}
+
+	error = devm_request_irq(dev, irq, sun4i_lradc_irq, 0,
 				 "sun4i-a10-lradc-keys", lradc);
 	if (error)
 		return error;
@@ -282,6 +288,14 @@ static int sun4i_lradc_probe(struct platform_device *pdev)
 	if (error)
 		return error;
 
+	device_set_wakeup_capable(dev, true);
+
+	error = dev_pm_set_wake_irq(dev, irq);
+	if (error) {
+		dev_err(dev, "Could not set wake IRQ\n");
+		return error;
+	}
+
 	return 0;
 }
 
-- 
2.26.2