[PATCH v2 4/4] Input: da9063 - Add polling support

[Biju Das <biju.das.jz@xxxxxxxxxxxxxx>]

On some platforms (eg: RZ/{G2UL,Five} SMARC EVK), there is no
onkey IRQ populated by default. Add polling support.

While at it, doing some cleanups in da9063_poll_on()
as regmap_read() and dev_err() can fit in single line.

Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
---
v1->v2:
 * Updated commit description
 * Fixed the logical mistake for optional IRQ handling.
---
 drivers/input/misc/da9063_onkey.c | 89 +++++++++++++++++++++++--------
 1 file changed, 66 insertions(+), 23 deletions(-)

diff --git a/drivers/input/misc/da9063_onkey.c b/drivers/input/misc/da9063_onkey.c
index b18232e91844..734cee9e9253 100644
--- a/drivers/input/misc/da9063_onkey.c
+++ b/drivers/input/misc/da9063_onkey.c
@@ -19,6 +19,8 @@
 #include <linux/mfd/da9062/core.h>
 #include <linux/mfd/da9062/registers.h>
 
+#define DA9062_KEY_THRESHOLD_MSEC	(200)
+
 struct da906x_chip_config {
 	/* REGS */
 	int onkey_status;
@@ -42,6 +44,8 @@ struct da9063_onkey {
 	const struct da906x_chip_config *config;
 	char phys[32];
 	bool key_power;
+	unsigned int poll_interval;
+	unsigned int key_threshold_release_time;
 };
 
 static const struct da906x_chip_config da9063_regs = {
@@ -86,15 +90,27 @@ static void da9063_poll_on(struct work_struct *work)
 	int error;
 
 	/* Poll to see when the pin is released */
-	error = regmap_read(onkey->regmap,
-			    config->onkey_status,
-			    &val);
+	error = regmap_read(onkey->regmap, config->onkey_status, &val);
 	if (error) {
-		dev_err(onkey->dev,
-			"Failed to read ON status: %d\n", error);
+		dev_err(onkey->dev, "Failed to read ON status: %d\n", error);
 		goto err_poll;
 	}
 
+	if (onkey->poll_interval &&
+	    onkey->key_threshold_release_time <= DA9062_KEY_THRESHOLD_MSEC) {
+		/* detect short or long key press */
+		if (!(val & config->onkey_nonkey_mask)) {
+			input_report_key(onkey->input, KEY_POWER, 0);
+			input_sync(onkey->input);
+			onkey->key_threshold_release_time = 0;
+			dev_dbg(onkey->dev, "KEY_POWER short press.\n");
+		} else {
+			schedule_delayed_work(&onkey->work, msecs_to_jiffies(50));
+			onkey->key_threshold_release_time += 50;
+		}
+		return;
+	}
+
 	if (!(val & config->onkey_nonkey_mask)) {
 		error = regmap_update_bits(onkey->regmap,
 					   config->onkey_pwr_signalling,
@@ -177,6 +193,21 @@ static irqreturn_t da9063_onkey_irq_handler(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
+static void da9063_onkey_polled_poll(struct input_dev *input)
+{
+	struct da9063_onkey *onkey = input_get_drvdata(input);
+	const struct da906x_chip_config *config = onkey->config;
+	unsigned int val;
+	int error;
+
+	error = regmap_read(onkey->regmap, config->onkey_status, &val);
+	if (onkey->key_power && !error && (val & config->onkey_nonkey_mask)) {
+		input_report_key(onkey->input, KEY_POWER, 1);
+		input_sync(onkey->input);
+		schedule_delayed_work(&onkey->work, 0);
+	}
+}
+
 static int da9063_onkey_probe(struct platform_device *pdev)
 {
 	struct da9063_onkey *onkey;
@@ -219,25 +250,37 @@ static int da9063_onkey_probe(struct platform_device *pdev)
 	if (error)
 		return error;
 
-	irq = platform_get_irq_byname(pdev, "ONKEY");
-	if (irq < 0)
+	irq = platform_get_irq_byname_optional(pdev, "ONKEY");
+	if (irq >= 0) {
+		error = devm_request_threaded_irq(&pdev->dev, irq,
+						  NULL, da9063_onkey_irq_handler,
+						  IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+						  "ONKEY", onkey);
+		if (error)
+			return dev_err_probe(&pdev->dev, error,
+					     "Failed to allocate onkey irq\n");
+
+		error = dev_pm_set_wake_irq(&pdev->dev, irq);
+		if (error)
+			dev_warn(&pdev->dev,
+				 "Failed to set IRQ %d as a wake IRQ: %d\n",
+				 irq, error);
+		else
+			device_init_wakeup(&pdev->dev, true);
+	} else if (irq != -ENXIO) {
 		return irq;
-
-	error = devm_request_threaded_irq(&pdev->dev, irq,
-					  NULL, da9063_onkey_irq_handler,
-					  IRQF_TRIGGER_LOW | IRQF_ONESHOT,
-					  "ONKEY", onkey);
-	if (error)
-		return dev_err_probe(&pdev->dev, error,
-				     "Failed to allocate onkey IRQ\n");
-
-	error = dev_pm_set_wake_irq(&pdev->dev, irq);
-	if (error)
-		dev_warn(&pdev->dev,
-			 "Failed to set IRQ %d as a wake IRQ: %d\n",
-			 irq, error);
-	else
-		device_init_wakeup(&pdev->dev, true);
+	} else {
+		input_set_drvdata(onkey->input, onkey);
+		device_property_read_u32(&pdev->dev, "poll-interval",
+					 &onkey->poll_interval);
+		error = input_setup_polling(onkey->input,
+					    da9063_onkey_polled_poll);
+		if (error)
+			return dev_err_probe(&pdev->dev, error,
+					     "unable to set up polling\n");
+
+		input_set_poll_interval(onkey->input, onkey->poll_interval);
+	}
 
 	return input_register_device(onkey->input);
 }
-- 
2.25.1