Input: stmfts - disable regulators and disable irq when power on fails

We must power off regulators and ensure that IRQ is disabled when
failing at power on phase. Create stmfts_configure function to limit
use of goto.

Signed-off-by: David Heidelberg <david@ixit.cz>
Link: https://patch.msgid.link/20260409-stmfts5-v4-5-64fe62027db5@ixit.cz
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/stmfts.c

@@ -539,29 +539,10 @@ static int stmfts_read_system_info(struct stmfts_data *sdata)
 	return 0;
 }
 
-static int stmfts_power_on(struct stmfts_data *sdata)
+static int stmfts_configure(struct stmfts_data *sdata)
 {
 	int err;
 
-	err = regulator_bulk_enable(ARRAY_SIZE(stmfts_supplies),
-				    sdata->supplies);
-	if (err)
-		return err;
-
-	/*
-	 * The datasheet does not specify the power on time, but considering
-	 * that the reset time is < 10ms, I sleep 20ms to be sure
-	 */
-	msleep(20);
-
-	err = stmfts_read_system_info(sdata);
-	if (err)
-		return err;
-
-	enable_irq(sdata->client->irq);
-
-	msleep(50);
-
 	err = stmfts_command(sdata, STMFTS_SYSTEM_RESET);
 	if (err)
 		return err;
@@ -586,13 +567,49 @@ static int stmfts_power_on(struct stmfts_data *sdata)
 	if (err)
 		return err;
 
+	return 0;
+}
+
+static int stmfts_power_on(struct stmfts_data *sdata)
+{
+	int err;
+
+	err = regulator_bulk_enable(ARRAY_SIZE(stmfts_supplies),
+				    sdata->supplies);
+	if (err)
+		return err;
+
+	/*
+	 * The datasheet does not specify the power on time, but considering
+	 * that the reset time is < 10ms, I sleep 20ms to be sure
+	 */
+	msleep(20);
+
+	err = stmfts_read_system_info(sdata);
+	if (err)
+		goto err_disable_regulators;
+
+	enable_irq(sdata->client->irq);
+
+	msleep(50);
+
+	err = stmfts_configure(sdata);
+	if (err)
+		goto err_disable_irq;
+
 	/*
 	 * At this point no one is using the touchscreen
 	 * and I don't really care about the return value
 	 */
-	(void) i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
+	(void)i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
 
 	return 0;
+
+err_disable_irq:
+	disable_irq(sdata->client->irq);
+err_disable_regulators:
+	regulator_bulk_disable(ARRAY_SIZE(stmfts_supplies), sdata->supplies);
+	return err;
 }
 
 static void stmfts_power_off(void *data)