linux-kernel - [PATCH] usb: common: usb-conn-gpio: Allow wakeup from system suspend

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Date:   Fri, 27 May 2022 12:19:06 +0530
From:   Prashanth K <quic_prashk@...cinc.com>
To:     Matthias Brugger <matthias.bgg@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Pavankumar Kondeti <quic_pkondeti@...cinc.com>,
        Pratham Pratap <quic_ppratap@...cinc.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Prashanth K <quic_prashk@...cinc.com>
Subject: [PATCH] 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@...cinc.com>
---
 drivers/usb/common/usb-conn-gpio.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/usb/common/usb-conn-gpio.c b/drivers/usb/common/usb-conn-gpio.c
index 395f9bb..b39c9f1c 100644
--- 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)
-- 
2.7.4