linux-kernel - [PATCH v2 1/1] input: bbnsm_pwrkey: Fix missed key press after suspend

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Message-Id: <20240716205612.1502608-3-Frank.Li@nxp.com>
Date: Tue, 16 Jul 2024 16:56:11 -0400
From: Frank Li <Frank.Li@....com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jason Liu <jason.hui.liu@....com>,
	Jacky Bai <ping.bai@....com>,
	Peng Fan <peng.fan@....com>,
	linux-input@...r.kernel.org (open list:INPUT (KEYBOARD, MOUSE, JOYSTICK, TOUCHSCREEN)...),
	linux-kernel@...r.kernel.org (open list)
Cc: imx@...ts.linux.dev
Subject: [PATCH v2 1/1] input: bbnsm_pwrkey: Fix missed key press after suspend

From: Jacky Bai <ping.bai@....com>

Report input event directly on wakeup to ensure no press event is missed
when resuming from suspend.

Signed-off-by: Jacky Bai <ping.bai@....com>
Reviewed-by: Peng Fan <peng.fan@....com>
Acked-by: Jason Liu <jason.hui.liu@....com>
Signed-off-by: Frank Li <Frank.Li@....com>
---
Change from v1 to v2
- move before mod_time
- clean suspend flag to make sure only fire once
---
 drivers/input/misc/nxp-bbnsm-pwrkey.c | 38 +++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/drivers/input/misc/nxp-bbnsm-pwrkey.c b/drivers/input/misc/nxp-bbnsm-pwrkey.c
index 1d99206dd3a8b..eb4173f9c8204 100644
--- a/drivers/input/misc/nxp-bbnsm-pwrkey.c
+++ b/drivers/input/misc/nxp-bbnsm-pwrkey.c
@@ -38,6 +38,7 @@ struct bbnsm_pwrkey {
 	int irq;
 	int keycode;
 	int keystate;  /* 1:pressed */
+	bool suspended;
 	struct timer_list check_timer;
 	struct input_dev *input;
 };
@@ -70,6 +71,7 @@ static irqreturn_t bbnsm_pwrkey_interrupt(int irq, void *dev_id)
 {
 	struct platform_device *pdev = dev_id;
 	struct bbnsm_pwrkey *bbnsm = platform_get_drvdata(pdev);
+	struct input_dev *input = bbnsm->input;
 	u32 event;
 
 	regmap_read(bbnsm->regmap, BBNSM_EVENTS, &event);
@@ -78,6 +80,18 @@ static irqreturn_t bbnsm_pwrkey_interrupt(int irq, void *dev_id)
 
 	pm_wakeup_event(bbnsm->input->dev.parent, 0);
 
+	/*
+	 * Directly report key event after resume to make sure key press
+	 * event is never missed.
+	 */
+	if (bbnsm->suspended) {
+		bbnsm->keystate = 1;
+		input_event(input, EV_KEY, bbnsm->keycode, 1);
+		input_sync(input);
+		/* Fire at most once per suspend/resume cycle */
+		bbnsm->suspended = false;
+	}
+
 	mod_timer(&bbnsm->check_timer,
 		   jiffies + msecs_to_jiffies(DEBOUNCE_TIME));
 
@@ -173,6 +187,29 @@ static int bbnsm_pwrkey_probe(struct platform_device *pdev)
 	return 0;
 }
 
+static int __maybe_unused bbnsm_pwrkey_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct bbnsm_pwrkey *bbnsm = platform_get_drvdata(pdev);
+
+	bbnsm->suspended = true;
+
+	return 0;
+}
+
+static int __maybe_unused bbnsm_pwrkey_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct bbnsm_pwrkey *bbnsm = platform_get_drvdata(pdev);
+
+	bbnsm->suspended = false;
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(bbnsm_pwrkey_pm_ops, bbnsm_pwrkey_suspend,
+		bbnsm_pwrkey_resume);
+
 static const struct of_device_id bbnsm_pwrkey_ids[] = {
 	{ .compatible = "nxp,imx93-bbnsm-pwrkey" },
 	{ /* sentinel */ }
@@ -182,6 +219,7 @@ MODULE_DEVICE_TABLE(of, bbnsm_pwrkey_ids);
 static struct platform_driver bbnsm_pwrkey_driver = {
 	.driver = {
 		.name = "bbnsm_pwrkey",
+		.pm = &bbnsm_pwrkey_pm_ops,
 		.of_match_table = bbnsm_pwrkey_ids,
 	},
 	.probe = bbnsm_pwrkey_probe,
-- 
2.34.1