linux-kernel - [PATCH 1/8] Input: elan_i2c - Use PM subsystem to manage wake irq

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Date:   Tue, 30 Aug 2022 17:15:34 -0600
From:   Raul E Rangel <rrangel@...omium.org>
To:     linux-acpi@...r.kernel.org, linux-input@...r.kernel.org
Cc:     hdegoede@...hat.com, mario.limonciello@....com, timvp@...gle.com,
        rafael@...nel.org, Raul E Rangel <rrangel@...omium.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        "jingle.wu" <jingle.wu@....com.tw>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/8] Input: elan_i2c - Use PM subsystem to manage wake irq

The Elan I2C touchpad driver is currently manually managing the wake
IRQ. This change removes the explicit enable_irq_wake/disable_irq_wake
and instead relies on the PM subsystem. This is done by calling
dev_pm_set_wake_irq.

i2c_device_probe already calls dev_pm_set_wake_irq when using device
tree, so it's only required when using ACPI. The net result is that this
change should be a no-op. i2c_device_remove also already calls
dev_pm_clear_wake_irq, so we don't need to do that in this driver.

I tested this on an ACPI system where the touchpad doesn't have _PRW
defined. I verified I can still wake the system and that the wake source
was the touchpad IRQ GPIO.

Signed-off-by: Raul E Rangel <rrangel@...omium.org>
---

 drivers/input/mouse/elan_i2c_core.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/input/mouse/elan_i2c_core.c b/drivers/input/mouse/elan_i2c_core.c
index e1758d5ffe4218..7d997d2b56436b 100644
--- a/drivers/input/mouse/elan_i2c_core.c
+++ b/drivers/input/mouse/elan_i2c_core.c
@@ -33,6 +33,7 @@
 #include <linux/jiffies.h>
 #include <linux/completion.h>
 #include <linux/of.h>
+#include <linux/pm_wakeirq.h>
 #include <linux/property.h>
 #include <linux/regulator/consumer.h>
 #include <asm/unaligned.h>
@@ -86,8 +87,6 @@ struct elan_tp_data {
 	u16			fw_page_size;
 	u32			fw_signature_address;
 
-	bool			irq_wake;
-
 	u8			min_baseline;
 	u8			max_baseline;
 	bool			baseline_ready;
@@ -1337,8 +1336,10 @@ static int elan_probe(struct i2c_client *client,
 	 * Systems using device tree should set up wakeup via DTS,
 	 * the rest will configure device as wakeup source by default.
 	 */
-	if (!dev->of_node)
+	if (!dev->of_node) {
 		device_init_wakeup(dev, true);
+		dev_pm_set_wake_irq(dev, client->irq);
+	}
 
 	return 0;
 }
@@ -1362,8 +1363,6 @@ static int __maybe_unused elan_suspend(struct device *dev)
 
 	if (device_may_wakeup(dev)) {
 		ret = elan_sleep(data);
-		/* Enable wake from IRQ */
-		data->irq_wake = (enable_irq_wake(client->irq) == 0);
 	} else {
 		ret = elan_set_power(data, false);
 		if (ret)
@@ -1394,9 +1393,6 @@ static int __maybe_unused elan_resume(struct device *dev)
 			dev_err(dev, "error %d enabling regulator\n", error);
 			goto err;
 		}
-	} else if (data->irq_wake) {
-		disable_irq_wake(client->irq);
-		data->irq_wake = false;
 	}
 
 	error = elan_set_power(data, true);
-- 
2.37.2.672.g94769d06f0-goog