linux-kernel - [PATCH] input: keyboard: snvs

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Date:   Mon,  7 Mar 2022 11:24:42 -0300
From:   Alifer Moraes <alifer.m@...iscite.com>
To:     linux-kernel@...r.kernel.org
Cc:     devicetree@...r.kernel.org, dmitry.torokhov@...il.com,
        eran.m@...iscite.com, festevam@...il.com, kernel@...gutronix.de,
        linux-arm-kernel@...ts.infradead.org, linux-imx@....com,
        linux-input@...r.kernel.org, pierluigi.p@...iscite.com,
        robh+dt@...nel.org, s.hauer@...gutronix.de, shawnguo@...nel.org,
        u.kleine-koenig@...gutronix.de, mcontenti <marco.c@...iscite.com>,
        Alifer Moraes <alifer.m@...iscite.com>
Subject: [PATCH] input: keyboard: snvs_pwrkey: Add key-release-only

From: Eran Matityahu <eran.m@...iscite.com>

On imx6qdl the interrupt only triggers on the release of the key.
Normally, the driver is looking for a change in the state of the key,
but since the interrupt triggers on release the key value is always 0,
so there was no event.

Add "key-release-only" boolean dts property to address this issue,
and create both key press and key release events when the key
is actually released.

Signed-off-by: Eran Matityahu <eran.m@...iscite.com>
Signed-off-by: mcontenti <marco.c@...iscite.com>
Signed-off-by: Alifer Moraes <alifer.m@...iscite.com>
---
 arch/arm/boot/dts/imx6qdl.dtsi       |  1 +
 drivers/input/keyboard/snvs_pwrkey.c | 21 ++++++++++++++++++++-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/imx6qdl.dtsi b/arch/arm/boot/dts/imx6qdl.dtsi
index d27beb47f9a3..9811e6bfd8e5 100644
--- a/arch/arm/boot/dts/imx6qdl.dtsi
+++ b/arch/arm/boot/dts/imx6qdl.dtsi
@@ -845,6 +845,7 @@ snvs_pwrkey: snvs-powerkey {
 					regmap = <&snvs>;
 					interrupts = <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>;
 					linux,keycode = <KEY_POWER>;
+					key-release-only;
 					wakeup-source;
 					status = "disabled";
 				};
diff --git a/drivers/input/keyboard/snvs_pwrkey.c b/drivers/input/keyboard/snvs_pwrkey.c
index 65286762b02a..b558e6f898fa 100644
--- a/drivers/input/keyboard/snvs_pwrkey.c
+++ b/drivers/input/keyboard/snvs_pwrkey.c
@@ -66,6 +66,22 @@ static void imx_imx_snvs_check_for_events(struct timer_list *t)
 	}
 }
 
+static void imx_imx_snvs_check_for_release_events(struct timer_list *t)
+{
+	struct pwrkey_drv_data *pdata = from_timer(pdata, t, check_timer);
+	struct input_dev *input = pdata->input;
+	u32 state;
+
+	/* interrupt only reports release of key so do not wait for state change */
+	state = 1;
+	input_event(input, EV_KEY, pdata->keycode, state);
+	input_sync(input);
+
+	state = 0;
+	input_event(input, EV_KEY, pdata->keycode, state);
+	input_sync(input);
+}
+
 static irqreturn_t imx_snvs_pwrkey_interrupt(int irq, void *dev_id)
 {
 	struct platform_device *pdev = dev_id;
@@ -177,7 +193,10 @@ static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
 	/* clear the unexpected interrupt before driver ready */
 	regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
 
-	timer_setup(&pdata->check_timer, imx_imx_snvs_check_for_events, 0);
+	if (of_property_read_bool(np, "key-release-only"))
+		timer_setup(&pdata->check_timer, imx_imx_snvs_check_for_release_events, 0);
+	else
+		timer_setup(&pdata->check_timer, imx_imx_snvs_check_for_events, 0);
 
 	input = devm_input_allocate_device(&pdev->dev);
 	if (!input) {
-- 
2.25.1