From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Fri, 6 Nov 2020 18:45:10 +0000 (+0000)
Subject: Input: edt-ft5x06: Poll the device if no interrupt is configured.
X-Git-Tag: accepted/tizen/unified/20230118.172025~1252
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3c8c852f212ee55fba7c88f9c7103b6c055c4829;p=platform%2Fkernel%2Flinux-rpi.git

Input: edt-ft5x06: Poll the device if no interrupt is configured.

Not all systems have the interrupt line wired up, so switch to
polling the touchscreen off a timer if no interrupt line is
configured.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---

diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
index bb2e1cb..339eae4 100644
--- a/drivers/input/touchscreen/edt-ft5x06.c
+++ b/drivers/input/touchscreen/edt-ft5x06.c
@@ -72,6 +72,8 @@
 #define EDT_DEFAULT_NUM_X		1024
 #define EDT_DEFAULT_NUM_Y		1024
 
+#define POLL_INTERVAL_MS		17	/* 17ms = 60fps */
+
 enum edt_pmode {
 	EDT_PMODE_NOT_SUPPORTED,
 	EDT_PMODE_HIBERNATE,
@@ -130,6 +132,9 @@ struct edt_ft5x06_ts_data {
 
 	struct edt_reg_addr reg_addr;
 	enum edt_ver version;
+
+	struct timer_list timer;
+	struct work_struct work_i2c_poll;
 };
 
 struct edt_i2c_chip_data {
@@ -279,6 +284,22 @@ out:
 	return IRQ_HANDLED;
 }
 
+static void edt_ft5x06_ts_irq_poll_timer(struct timer_list *t)
+{
+	struct edt_ft5x06_ts_data *tsdata = from_timer(tsdata, t, timer);
+
+	schedule_work(&tsdata->work_i2c_poll);
+	mod_timer(&tsdata->timer, jiffies + msecs_to_jiffies(POLL_INTERVAL_MS));
+}
+
+static void edt_ft5x06_ts_work_i2c_poll(struct work_struct *work)
+{
+	struct edt_ft5x06_ts_data *tsdata = container_of(work,
+			struct edt_ft5x06_ts_data, work_i2c_poll);
+
+	edt_ft5x06_ts_isr(0, tsdata);
+}
+
 static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
 				     u8 addr, u8 value)
 {
@@ -1234,17 +1255,27 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
 
 	i2c_set_clientdata(client, tsdata);
 
-	irq_flags = irq_get_trigger_type(client->irq);
-	if (irq_flags == IRQF_TRIGGER_NONE)
-		irq_flags = IRQF_TRIGGER_FALLING;
-	irq_flags |= IRQF_ONESHOT;
+	if (client->irq) {
+		irq_flags = irq_get_trigger_type(client->irq);
+		if (irq_flags == IRQF_TRIGGER_NONE)
+			irq_flags = IRQF_TRIGGER_FALLING;
+		irq_flags |= IRQF_ONESHOT;
 
-	error = devm_request_threaded_irq(&client->dev, client->irq,
-					NULL, edt_ft5x06_ts_isr, irq_flags,
-					client->name, tsdata);
-	if (error) {
-		dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
-		return error;
+		error = devm_request_threaded_irq(&client->dev, client->irq,
+						  NULL, edt_ft5x06_ts_isr,
+						  irq_flags, client->name,
+						  tsdata);
+		if (error) {
+			dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
+			return error;
+		}
+	} else {
+		INIT_WORK(&tsdata->work_i2c_poll,
+			  edt_ft5x06_ts_work_i2c_poll);
+		timer_setup(&tsdata->timer, edt_ft5x06_ts_irq_poll_timer, 0);
+		tsdata->timer.expires = jiffies +
+					msecs_to_jiffies(POLL_INTERVAL_MS);
+		add_timer(&tsdata->timer);
 	}
 
 	error = devm_device_add_group(&client->dev, &edt_ft5x06_attr_group);