linux-kernel - [PATCH 2/3] Input: axp20x-pek - Respect userspace wakeup configuration

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Date:   Sun, 12 Jan 2020 21:20:31 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Hans de Goede <hdegoede@...hat.com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com, Samuel Holland <samuel@...lland.org>
Subject: [PATCH 2/3] Input: axp20x-pek - Respect userspace wakeup configuration

Unlike most other power button drivers, this driver unconditionally
enables its wakeup IRQ. It should be using device_may_wakeup() to
respect the userspace configuration of wakeup sources.

Because the AXP20x MFD device uses regmap-irq, the AXP20x PEK IRQs are
nested off of regmap-irq's threaded interrupt handler. The device core
ignores such interrupts, so to actually disable wakeup, we must
explicitly disable all non-wakeup interrupts during suspend.

Signed-off-by: Samuel Holland <samuel@...lland.org>
---
 drivers/input/misc/axp20x-pek.c | 42 ++++++++++++++++++++++++++++++++-
 1 file changed, 41 insertions(+), 1 deletion(-)

diff --git a/drivers/input/misc/axp20x-pek.c b/drivers/input/misc/axp20x-pek.c
index 7d0ee5bececb..38cd4a4aeb65 100644
--- a/drivers/input/misc/axp20x-pek.c
+++ b/drivers/input/misc/axp20x-pek.c
@@ -280,7 +280,7 @@ static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek,
 	}
 
 	if (axp20x_pek->axp20x->variant == AXP288_ID)
-		enable_irq_wake(axp20x_pek->irq_dbr);
+		device_init_wakeup(&pdev->dev, true);
 
 	return 0;
 }
@@ -352,6 +352,45 @@ static int axp20x_pek_probe(struct platform_device *pdev)
 	return 0;
 }
 
+#if CONFIG_PM_SLEEP
+static int axp20x_pek_suspend(struct device *dev)
+{
+	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
+
+	/*
+	 * Nested threaded interrupts are not automatically
+	 * disabled, so we must do it explicitly.
+	 */
+	if (device_may_wakeup(dev)) {
+		enable_irq_wake(axp20x_pek->irq_dbf);
+		enable_irq_wake(axp20x_pek->irq_dbr);
+	} else {
+		disable_irq(axp20x_pek->irq_dbf);
+		disable_irq(axp20x_pek->irq_dbr);
+	}
+
+	return 0;
+}
+
+static int axp20x_pek_resume(struct device *dev)
+{
+	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev)) {
+		disable_irq_wake(axp20x_pek->irq_dbf);
+		disable_irq_wake(axp20x_pek->irq_dbr);
+	} else {
+		enable_irq(axp20x_pek->irq_dbf);
+		enable_irq(axp20x_pek->irq_dbr);
+	}
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(axp20x_pek_pm_ops, axp20x_pek_suspend,
+					    axp20x_pek_resume);
+
 static const struct platform_device_id axp_pek_id_match[] = {
 	{
 		.name = "axp20x-pek",
@@ -371,6 +410,7 @@ static struct platform_driver axp20x_pek_driver = {
 	.driver		= {
 		.name		= "axp20x-pek",
 		.dev_groups	= axp20x_groups,
+		.pm		= &axp20x_pek_pm_ops,
 	},
 };
 module_platform_driver(axp20x_pek_driver);
-- 
2.23.0