linux-kernel - [PATCH 2/2] usb: typec: tipd: Support wakeup

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Message-Id: <20230105075058.924680-2-jun.nie@linaro.org>
Date:   Thu,  5 Jan 2023 15:50:58 +0800
From:   Jun Nie <jun.nie@...aro.org>
To:     heikki.krogerus@...ux.intel.com, gregkh@...uxfoundation.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        devicetree@...r.kernel.org
Cc:     sven@...npeter.dev, shawn.guo@...aro.org,
        bryan.odonoghue@...aro.org, Jun Nie <jun.nie@...aro.org>
Subject: [PATCH 2/2] 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 <jun.nie@...aro.org>
---
 drivers/usb/typec/tipd/core.c | 38 +++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
index 46a4d8b128f0..485b90c13078 100644
--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -95,6 +95,7 @@ struct tps6598x {
 	struct power_supply_desc psy_desc;
 	enum power_supply_usb_type usb_type;
 
+	int wakeup;
 	u16 pwr_status;
 };
 
@@ -846,6 +847,12 @@ static int tps6598x_probe(struct i2c_client *client)
 	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:
@@ -870,6 +877,36 @@ static void tps6598x_remove(struct i2c_client *client)
 	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", },
@@ -886,6 +923,7 @@ MODULE_DEVICE_TABLE(i2c, tps6598x_id);
 static struct i2c_driver tps6598x_i2c_driver = {
 	.driver = {
 		.name = "tps6598x",
+		.pm = &tps6598x_pm_ops,
 		.of_match_table = tps6598x_of_match,
 	},
 	.probe_new = tps6598x_probe,
-- 
2.34.1