linux-kernel - [PATCH v2] HID: i2c-hid: Enable touchpad wakeup from Suspend-to-Idle

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Message-Id: <20200518122442.1939-1-kai.heng.feng@canonical.com>
Date:   Mon, 18 May 2020 20:24:40 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     jikos@...nel.org, benjamin.tissoires@...hat.com
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Daniel Playfair Cal <daniel.playfair.cal@...il.com>,
        HungNien Chen <hn.chen@...dahitech.com>,
        You-Sheng Yang <vicamo.yang@...onical.com>,
        Pavel Balan <admin@...ma.net>,
        linux-input@...r.kernel.org (open list:HID CORE LAYER),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2] HID: i2c-hid: Enable touchpad wakeup from Suspend-to-Idle

Many laptops have the ability to be woken up from Suspend-to-Idle by
touchpad. This is also the default behavior on other OSes.

So let's enable the wakeup support if the system defaults to use
Suspend-to-Idle.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
v2:
 - Fix compile error when ACPI is not enabled.

 drivers/hid/i2c-hid/i2c-hid-core.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c
index 294c84e136d7..e6caef006cd3 100644
--- a/drivers/hid/i2c-hid/i2c-hid-core.c
+++ b/drivers/hid/i2c-hid/i2c-hid-core.c
@@ -931,6 +931,14 @@ static void i2c_hid_acpi_fix_up_power(struct device *dev)
 		acpi_device_fix_up_power(adev);
 }
 
+static void i2c_hid_acpi_enable_wakeup(struct device *dev)
+{
+	if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) {
+		device_set_wakeup_capable(dev, true);
+		device_wakeup_enable(dev);
+	}
+}
+
 static const struct acpi_device_id i2c_hid_acpi_match[] = {
 	{"ACPI0C50", 0 },
 	{"PNP0C50", 0 },
@@ -945,6 +953,8 @@ static inline int i2c_hid_acpi_pdata(struct i2c_client *client,
 }
 
 static inline void i2c_hid_acpi_fix_up_power(struct device *dev) {}
+
+static inline void i2c_hid_acpi_enable_wakeup(struct device *dev) {}
 #endif
 
 #ifdef CONFIG_OF
@@ -1072,6 +1082,8 @@ static int i2c_hid_probe(struct i2c_client *client,
 
 	i2c_hid_acpi_fix_up_power(&client->dev);
 
+	i2c_hid_acpi_enable_wakeup(&client->dev);
+
 	device_enable_async_suspend(&client->dev);
 
 	/* Make sure there is something at this address */
-- 
2.17.1