[PATCH v3 0/2] sunxi LRADC/volume key wakeup support

[PATCH v3 0/2] sunxi LRADC/volume key wakeup support

[Samuel Holland]

This series allows the volume keys on the PinePhone (and other devices
with LRADC buttons) to wake up the device.

Currently `make dtbs_check` complains because the DT update was merged
without the binding.

Changes since v2:
  - Dropped unnecessary pr_err in platform_get_irq() error path
  - Dropped patch 3 (DT update) as it was merged
  - Added Acked-by/Reviewed-by tags

Changes since v1:
  - Add requisite DT binding change
  - Only add wakeup capability if "wakeup-source" is present
  - Warn but do not error out if setting the wake IRQ fails
  - Add "wakeup-source" property to PinePhone device tree

Ondrej Jirman (1):
  input: sun4i-lradc-keys -  Add wakup support

Samuel Holland (1):
  dt-bindings: sun4i-a10-lradc-keys: Accept wakeup-source property

 .../input/allwinner,sun4i-a10-lradc-keys.yaml |  2 ++
 drivers/input/keyboard/sun4i-lradc-keys.c     | 20 +++++++++++++++----
 2 files changed, 18 insertions(+), 4 deletions(-)

-- 
2.26.3

[PATCH v3 1/2] dt-bindings: sun4i-a10-lradc-keys: Accept wakeup-source property

[Samuel Holland]

The LRADC provides an interrupt that can be used to wake the system.
Signify this by accepting a "wakeup-source" property in the binding.

Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Samuel Holland <samuel@sholland.org>
---
 .../bindings/input/allwinner,sun4i-a10-lradc-keys.yaml          | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/allwinner,sun4i-a10-lradc-keys.yaml b/Documentation/devicetree/bindings/input/allwinner,sun4i-a10-lradc-keys.yaml
index cffd02028d02..d74f2002409e 100644
--- a/Documentation/devicetree/bindings/input/allwinner,sun4i-a10-lradc-keys.yaml
+++ b/Documentation/devicetree/bindings/input/allwinner,sun4i-a10-lradc-keys.yaml
@@ -29,6 +29,8 @@ properties:
     description:
       Regulator for the LRADC reference voltage
 
+  wakeup-source: true
+
 patternProperties:
   "^button-[0-9]+$":
     type: object
-- 
2.26.3

[PATCH v3 2/2] input: sun4i-lradc-keys - Add wakup support

[Samuel Holland]

From: Ondrej Jirman <megous@megous.com>

Allow the driver to wake the system on key press if the "wakeup-source"
property is provided in the device tree. Using the LRADC as a wakeup
source requires keeping the AVCC domain active during sleep. Since this
has a nontrivial impact on power consumption (sometimes doubling it),
disable the LRADC wakeup source by default.

Acked-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Ondrej Jirman <megous@megous.com>
Signed-off-by: Samuel Holland <samuel@sholland.org>
---
 drivers/input/keyboard/sun4i-lradc-keys.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/input/keyboard/sun4i-lradc-keys.c b/drivers/input/keyboard/sun4i-lradc-keys.c
index 4a796bed48ac..af1683d68c8c 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 +273,11 @@ 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)
+		return irq;
+
+	error = devm_request_irq(dev, irq, sun4i_lradc_irq, 0,
 				 "sun4i-a10-lradc-keys", lradc);
 	if (error)
 		return error;
@@ -282,6 +286,14 @@ static int sun4i_lradc_probe(struct platform_device *pdev)
 	if (error)
 		return error;
 
+	if (device_property_read_bool(dev, "wakeup-source")) {
+		device_set_wakeup_capable(dev, true);
+
+		error = dev_pm_set_wake_irq(dev, irq);
+		if (error)
+			dev_warn(dev, "Failed to set wake IRQ\n");
+	}
+
 	return 0;
 }
 
-- 
2.26.3