usb: typec: tipd: Support wakeup

Enable wakeup when pluging or unpluging USB cable. It is up to other
components to hold system in active mode, such as display, so that
user can receive the notification.

Signed-off-by: Jun Nie <[e-mail]>
Reviewed-by: Heikki Krogerus <[e-mail]>
Reviewed-by: Bryan O'Donoghue <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/typec/tipd/core.c

···
 	struct power_supply_desc psy_desc;
 	enum power_supply_usb_type usb_type;
 
+	int wakeup;
 	u16 pwr_status;
 };
 
···
 	i2c_set_clientdata(client, tps);
 	fwnode_handle_put(fwnode);
 
+	tps->wakeup = device_property_read_bool(tps->dev, "wakeup-source");
+	if (tps->wakeup) {
+		device_init_wakeup(&client->dev, true);
+		enable_irq_wake(client->irq);
+	}
+
 	return 0;
 
 err_disconnect:
···
 	usb_role_switch_put(tps->role_sw);
 }
 
+static int __maybe_unused tps6598x_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct tps6598x *tps = i2c_get_clientdata(client);
+
+	if (tps->wakeup) {
+		disable_irq(client->irq);
+		enable_irq_wake(client->irq);
+	}
+
+	return 0;
+}
+
+static int __maybe_unused tps6598x_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct tps6598x *tps = i2c_get_clientdata(client);
+
+	if (tps->wakeup) {
+		disable_irq_wake(client->irq);
+		enable_irq(client->irq);
+	}
+
+	return 0;
+}
+
+static const struct dev_pm_ops tps6598x_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(tps6598x_suspend, tps6598x_resume)
+};
+
 static const struct of_device_id tps6598x_of_match[] = {
 	{ .compatible = "ti,tps6598x", },
 	{ .compatible = "apple,cd321x", },
···
 static struct i2c_driver tps6598x_i2c_driver = {
 	.driver = {
 		.name = "tps6598x",
+		.pm = &tps6598x_pm_ops,
 		.of_match_table = tps6598x_of_match,
 	},
 	.probe_new = tps6598x_probe,