[PATCH 1/3] usb: typec: tcpm/tcpci_maxim: fix irq wake usage

[André Draszik]

This driver calls enable_irq_wake() during probe() unconditionally, and
never issues the required corresponding disable_irq_wake() to disable
hardware interrupt wakeup signals.

Additionally, whether or not a device should wake-up the system is
meant to be a policy decision based on sysfs (.../power/wakeup) in the
first place.

Update the driver to use the standard approach to enable/disable IRQ
wake during the suspend/resume callbacks. This solves both issues
described above.

Signed-off-by: André Draszik <andre.draszik@xxxxxxxxxx>
---
 drivers/usb/typec/tcpm/tcpci_maxim_core.c | 46 ++++++++++++++++++++-----------
 1 file changed, 30 insertions(+), 16 deletions(-)

diff --git a/drivers/usb/typec/tcpm/tcpci_maxim_core.c b/drivers/usb/typec/tcpm/tcpci_maxim_core.c
index b5a5ed40faea9cfcceef5550263968148646eb44..ff3604be79da73ca5acff7b5b2434c116ed12ef8 100644
--- a/drivers/usb/typec/tcpm/tcpci_maxim_core.c
+++ b/drivers/usb/typec/tcpm/tcpci_maxim_core.c
@@ -421,21 +421,6 @@ static irqreturn_t max_tcpci_isr(int irq, void *dev_id)
 	return IRQ_WAKE_THREAD;
 }
 
-static int max_tcpci_init_alert(struct max_tcpci_chip *chip, struct i2c_client *client)
-{
-	int ret;
-
-	ret = devm_request_threaded_irq(chip->dev, client->irq, max_tcpci_isr, max_tcpci_irq,
-					(IRQF_TRIGGER_LOW | IRQF_ONESHOT), dev_name(chip->dev),
-					chip);
-
-	if (ret < 0)
-		return ret;
-
-	enable_irq_wake(client->irq);
-	return 0;
-}
-
 static int max_tcpci_start_toggling(struct tcpci *tcpci, struct tcpci_data *tdata,
 				    enum typec_cc_status cc)
 {
@@ -532,7 +517,9 @@ static int max_tcpci_probe(struct i2c_client *client)
 
 	chip->port = tcpci_get_tcpm_port(chip->tcpci);
 
-	ret = max_tcpci_init_alert(chip, client);
+	ret = devm_request_threaded_irq(&client->dev, client->irq, max_tcpci_isr, max_tcpci_irq,
+					(IRQF_TRIGGER_LOW | IRQF_ONESHOT), dev_name(chip->dev),
+					chip);
 	if (ret < 0)
 		return dev_err_probe(&client->dev, ret,
 				     "IRQ initialization failed\n");
@@ -544,6 +531,32 @@ static int max_tcpci_probe(struct i2c_client *client)
 	return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int max_tcpci_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	int ret = 0;
+
+	if (client->irq && device_may_wakeup(dev))
+		ret = disable_irq_wake(client->irq);
+
+	return ret;
+}
+
+static int max_tcpci_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	int ret = 0;
+
+	if (client->irq && device_may_wakeup(dev))
+		ret = enable_irq_wake(client->irq);
+
+	return ret;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static SIMPLE_DEV_PM_OPS(max_tcpci_pm_ops, max_tcpci_suspend, max_tcpci_resume);
+
 static const struct i2c_device_id max_tcpci_id[] = {
 	{ "maxtcpc" },
 	{ }
@@ -562,6 +575,7 @@ static struct i2c_driver max_tcpci_i2c_driver = {
 	.driver = {
 		.name = "maxtcpc",
 		.of_match_table = of_match_ptr(max_tcpci_of_match),
+		.pm = &max_tcpci_pm_ops,
 	},
 	.probe = max_tcpci_probe,
 	.id_table = max_tcpci_id,

-- 
2.50.0.727.gbf7dc18ff4-goog