usb: typec: tcpci: add wakeup support

Add wakeup support for tcpci. If the user enables the wakeup file, call
enable_irq_wake() during system suspend and disable_irq_wake() during
system resume. Since this driver supports shared interrupts, mask the
chip interrupt by default when wakeup is disabled to avoid affecting
other IRQ users.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Badhri Jagan Sridharan <badhri@google.com>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Link: https://lore.kernel.org/r/20250910105042.695146-1-xu.yang_2@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c
index a56e31b20c214fc509423d2f8602d3599c1dd2c1..2a951c585e92bcdff4d713533a34ed836ca6d3f0 100644 (file)
--- a/drivers/usb/typec/tcpm/tcpci.c
+++ b/drivers/usb/typec/tcpm/tcpci.c
@@ -949,6 +949,8 @@ static int tcpci_probe(struct i2c_client *client)
        if (err < 0)
                goto unregister_port;
 
+       device_set_wakeup_capable(chip->tcpci->dev, true);
+
        return 0;
 
 unregister_port:
@@ -969,6 +971,36 @@ static void tcpci_remove(struct i2c_client *client)
        tcpci_unregister_port(chip->tcpci);
 }
 
+static int tcpci_suspend(struct device *dev)
+{
+       struct i2c_client *i2c = to_i2c_client(dev);
+       struct tcpci_chip *chip = i2c_get_clientdata(i2c);
+       int ret;
+
+       if (device_may_wakeup(dev))
+               ret = enable_irq_wake(i2c->irq);
+       else
+               ret = tcpci_write16(chip->tcpci, TCPC_ALERT_MASK, 0);
+
+       return ret;
+}
+
+static int tcpci_resume(struct device *dev)
+{
+       struct i2c_client *i2c = to_i2c_client(dev);
+       struct tcpci_chip *chip = i2c_get_clientdata(i2c);
+       int ret;
+
+       if (device_may_wakeup(dev))
+               ret = disable_irq_wake(i2c->irq);
+       else
+               ret = tcpci_write16(chip->tcpci, TCPC_ALERT_MASK, chip->tcpci->alert_mask);
+
+       return ret;
+}
+
+DEFINE_SIMPLE_DEV_PM_OPS(tcpci_pm_ops, tcpci_suspend, tcpci_resume);
+
 static const struct i2c_device_id tcpci_id[] = {
        { "tcpci" },
        { }
@@ -987,6 +1019,7 @@ MODULE_DEVICE_TABLE(of, tcpci_of_match);
 static struct i2c_driver tcpci_i2c_driver = {
        .driver = {
                .name = "tcpci",
+               .pm = pm_sleep_ptr(&tcpci_pm_ops),
                .of_match_table = of_match_ptr(tcpci_of_match),
        },
        .probe = tcpci_probe,