[PATCH v2 1/2] input: egalax_ts: free irq resource before request the line as GPIO

[haibo.chen@xxxxxxx]

From: Haibo Chen <haibo.chen@xxxxxxx>

If GPIO is connected to an IRQ then it should not request it as
GPIO function only when free its IRQ resource.

Signed-off-by: Haibo Chen <haibo.chen@xxxxxxx>
---
 drivers/input/touchscreen/egalax_ts.c | 46 ++++++++++++++++++++++-----
 1 file changed, 38 insertions(+), 8 deletions(-)

diff --git a/drivers/input/touchscreen/egalax_ts.c b/drivers/input/touchscreen/egalax_ts.c
index 83ac8c128192..c816e03ba421 100644
--- a/drivers/input/touchscreen/egalax_ts.c
+++ b/drivers/input/touchscreen/egalax_ts.c
@@ -116,6 +116,26 @@ static irqreturn_t egalax_ts_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+static int egalax_irq_request(struct egalax_ts *ts)
+{
+	int ret;
+	struct i2c_client *client = ts->client;
+
+	ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+					egalax_ts_interrupt,
+					IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+					"egalax_ts", ts);
+	if (ret < 0)
+		dev_err(&client->dev, "Failed to register interrupt\n");
+
+	return ret;
+}
+
+static void egalax_free_irq(struct egalax_ts *ts)
+{
+	devm_free_irq(&ts->client->dev, ts->client->irq, ts);
+}
+
 /* wake up controller by an falling edge of interrupt gpio.  */
 static int egalax_wake_up_device(struct i2c_client *client)
 {
@@ -211,19 +231,16 @@ static int egalax_ts_probe(struct i2c_client *client,
 			     ABS_MT_POSITION_Y, 0, EGALAX_MAX_Y, 0, 0);
 	input_mt_init_slots(input_dev, MAX_SUPPORT_POINTS, 0);
 
-	error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
-					  egalax_ts_interrupt,
-					  IRQF_TRIGGER_LOW | IRQF_ONESHOT,
-					  "egalax_ts", ts);
-	if (error < 0) {
-		dev_err(&client->dev, "Failed to register interrupt\n");
+	error = egalax_irq_request(ts);
+	if (error)
 		return error;
-	}
 
 	error = input_register_device(ts->input_dev);
 	if (error)
 		return error;
 
+	i2c_set_clientdata(client, ts);
+
 	return 0;
 }
 
@@ -251,11 +268,24 @@ static int __maybe_unused egalax_ts_suspend(struct device *dev)
 static int __maybe_unused egalax_ts_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
+	struct egalax_ts *ts = i2c_get_clientdata(client);
+	int error;
 
 	if (device_may_wakeup(dev))
 		return disable_irq_wake(client->irq);
 
-	return egalax_wake_up_device(client);
+	/* Free IRQ as IRQ pin is used as output in the suspend sequence */
+	egalax_free_irq(ts);
+
+	error = egalax_wake_up_device(client);
+	if (error) {
+		dev_err(&client->dev, "Failed to wake up the controller\n");
+		return error;
+	}
+
+	error = egalax_irq_request(ts);
+
+	return error;
 }
 
 static SIMPLE_DEV_PM_OPS(egalax_ts_pm_ops, egalax_ts_suspend, egalax_ts_resume);
-- 
2.17.1