[PATCH 2/3] input: misc: pm8941-pwrkey: simulate missed key press events

[Anjelique Melendez <quic_amelende@quicinc.com>]

From: David Collins <collinsd@codeaurora.org>

The status of the keys connected to the KPDPWR_N and RESIN_N pins
is identified by reading corresponding bits in the interrupt real
time status register.  If the status has changed by the time that
the interrupt is handled then a press event will be missed.

Maintain a last known status variable to find unbalanced release
events and simulate press events for each accordingly.

Change-Id: I180469a7048a40e490f21d0f8b9504136131e75b
Signed-off-by: David Collins <collinsd@codeaurora.org>
Signed-off-by: Anjelique Melendez <quic_amelende@quicinc.com>
---
 drivers/input/misc/pm8941-pwrkey.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/input/misc/pm8941-pwrkey.c b/drivers/input/misc/pm8941-pwrkey.c
index b912ce00ce1c..0ce00736e695 100644
--- a/drivers/input/misc/pm8941-pwrkey.c
+++ b/drivers/input/misc/pm8941-pwrkey.c
@@ -77,6 +77,7 @@ struct pm8941_pwrkey {
 	u32 code;
 	u32 sw_debounce_time_us;
 	ktime_t last_release_time;
+	bool last_status;
 	const struct pm8941_data *data;
 };
 
@@ -166,6 +167,16 @@ static irqreturn_t pm8941_pwrkey_irq(int irq, void *_data)
 	if (pwrkey->sw_debounce_time_us && !sts)
 		pwrkey->last_release_time = ktime_get();
 
+	/*
+	 * Simulate a press event in case a release event occurred without a
+	 * corresponding press event.
+	 */
+	if (!pwrkey->last_status && !sts) {
+		input_report_key(pwrkey->input, pwrkey->code, 1);
+		input_sync(pwrkey->input);
+	}
+	pwrkey->last_status = sts;
+
 	input_report_key(pwrkey->input, pwrkey->code, sts);
 	input_sync(pwrkey->input);
 
-- 
2.34.1