[PATCH v2 2/2 RESEND] input: touchcreen: tsc2007: make interrupt optional

[Svyatoslav Ryhel <clamor95@gmail.com>]

In case tsc2007 is used as an ADC sensor there will be no interrupt
provided at all, so set up an interrupt only if one is present.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
---
 drivers/input/touchscreen/tsc2007_core.c | 28 ++++++++++++++----------
 1 file changed, 16 insertions(+), 12 deletions(-)

diff --git a/drivers/input/touchscreen/tsc2007_core.c b/drivers/input/touchscreen/tsc2007_core.c
index 17c82baf87df..4b169200e689 100644
--- a/drivers/input/touchscreen/tsc2007_core.c
+++ b/drivers/input/touchscreen/tsc2007_core.c
@@ -178,7 +178,8 @@ static void tsc2007_stop(struct tsc2007 *ts)
 	mb();
 	wake_up(&ts->wait);
 
-	disable_irq(ts->irq);
+	if (ts->irq)
+		disable_irq(ts->irq);
 }
 
 static int tsc2007_open(struct input_dev *input_dev)
@@ -189,7 +190,8 @@ static int tsc2007_open(struct input_dev *input_dev)
 	ts->stopped = false;
 	mb();
 
-	enable_irq(ts->irq);
+	if (ts->irq)
+		enable_irq(ts->irq);
 
 	/* Prepare for touch readings - power down ADC and enable PENIRQ */
 	err = tsc2007_xfer(ts, PWRDOWN);
@@ -362,17 +364,19 @@ static int tsc2007_probe(struct i2c_client *client)
 			pdata->init_platform_hw();
 	}
 
-	err = devm_request_threaded_irq(&client->dev, ts->irq,
-					NULL, tsc2007_soft_irq,
-					IRQF_ONESHOT,
-					client->dev.driver->name, ts);
-	if (err) {
-		dev_err(&client->dev, "Failed to request irq %d: %d\n",
-			ts->irq, err);
-		return err;
-	}
+	if (ts->irq) {
+		err = devm_request_threaded_irq(&client->dev, ts->irq,
+						NULL, tsc2007_soft_irq,
+						IRQF_ONESHOT,
+						client->dev.driver->name, ts);
+		if (err) {
+			dev_err(&client->dev, "Failed to request irq %d: %d\n",
+				ts->irq, err);
+			return err;
+		}
 
-	tsc2007_stop(ts);
+		tsc2007_stop(ts);
+	}
 
 	/* power down the chip (TSC2007_SETUP does not ACK on I2C) */
 	err = tsc2007_xfer(ts, PWRDOWN);
-- 
2.43.0