Input: bbnsm_pwrkey - fix missed key press after suspend

Report input event directly on wakeup to ensure no press event is missed
when resuming from suspend.
Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Acked-by: Jason Liu <jason.hui.liu@nxp.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20240716000721.3485597-1-Frank.Li@nxp.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

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,