Input: raydium_ts_i2c - use PM subsystem to manage wake irq

The raydium I2C touchscreen 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, and i2c_device_remove also already calls dev_pm_clear_wake_irq.
There could be some device tree systems that have incorrectly declared
`wake` capabilities, so this change will set the wake irq if one is
missing. This matches the previous behavior.
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Link: https://lore.kernel.org/r/20220929093200.v6.4.I06b417b274bbecb31775a73993a7a3c1bc80de7b@changeidSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/raydium_i2c_ts.c

@@ -21,6 +21,7 @@
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/pm_wakeirq.h>
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <asm/unaligned.h>
@@ -134,8 +135,6 @@ struct raydium_data {
 	u8 pkg_size;
 
 	enum raydium_boot_mode boot_mode;
-
-	bool wake_irq_enabled;
 };
 
 /*
@@ -1186,6 +1185,15 @@ static int raydium_i2c_probe(struct i2c_client *client,
 		return error;
 	}
 
+	/*
+	 * The wake IRQ should be declared via device tree instead of assuming
+	 * the IRQ can wake the system. This is here for legacy reasons and
+	 * will be removed once the i2c-core supports querying ACPI for wake
+	 * capabilities.
+	 */
+	if (!client->dev.power.wakeirq)
+		dev_pm_set_wake_irq(&client->dev, client->irq);
+
 	error = devm_device_add_group(&client->dev,
 				   &raydium_i2c_attribute_group);
 	if (error) {
@@ -1222,8 +1230,6 @@ static int __maybe_unused raydium_i2c_suspend(struct device *dev)
 
 	if (device_may_wakeup(dev)) {
 		raydium_enter_sleep(client);
-
-		ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0);
 	} else {
 		raydium_i2c_power_off(ts);
 	}
@@ -1237,8 +1243,6 @@ static int __maybe_unused raydium_i2c_resume(struct device *dev)
 	struct raydium_data *ts = i2c_get_clientdata(client);
 
 	if (device_may_wakeup(dev)) {
-		if (ts->wake_irq_enabled)
-			disable_irq_wake(client->irq);
 		raydium_i2c_sw_reset(client);
 	} else {
 		raydium_i2c_power_on(ts);