usb: common: usb-conn-gpio: Allow wakeup from system suspend

Currently the VBUS/ID detection interrupts are disabled during system
suspend. So the USB cable connect/disconnect event can't wakeup the
system from low power mode. To allow this, we keep these interrupts
enabled and configure them as wakeup capable. This behavior can be
controlled through device wakeup source policy by the user space.

Signed-off-by: Prashanth K <quic_prashk@quicinc.com>
Link: https://lore.kernel.org/r/1653634146-12215-1-git-send-email-quic_prashk@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/common/usb-conn-gpio.c b/drivers/usb/common/usb-conn-gpio.c
index 395f9bbe30564d88878823d3820f084648c45a14..b39c9f1c375d6e358ae7d62c81aa280f9a007be6 100644 (file)
--- a/drivers/usb/common/usb-conn-gpio.c
+++ b/drivers/usb/common/usb-conn-gpio.c
@@ -257,6 +257,7 @@ static int usb_conn_probe(struct platform_device *pdev)
        }
 
        platform_set_drvdata(pdev, info);
+       device_set_wakeup_capable(&pdev->dev, true);
 
        /* Perform initial detection */
        usb_conn_queue_dwork(info, 0);
@@ -286,6 +287,14 @@ static int __maybe_unused usb_conn_suspend(struct device *dev)
 {
        struct usb_conn_info *info = dev_get_drvdata(dev);
 
+       if (device_may_wakeup(dev)) {
+               if (info->id_gpiod)
+                       enable_irq_wake(info->id_irq);
+               if (info->vbus_gpiod)
+                       enable_irq_wake(info->vbus_irq);
+               return 0;
+       }
+
        if (info->id_gpiod)
                disable_irq(info->id_irq);
        if (info->vbus_gpiod)
@@ -300,6 +309,14 @@ static int __maybe_unused usb_conn_resume(struct device *dev)
 {
        struct usb_conn_info *info = dev_get_drvdata(dev);
 
+       if (device_may_wakeup(dev)) {
+               if (info->id_gpiod)
+                       disable_irq_wake(info->id_irq);
+               if (info->vbus_gpiod)
+                       disable_irq_wake(info->vbus_irq);
+               return 0;
+       }
+
        pinctrl_pm_select_default_state(dev);
 
        if (info->id_gpiod)