linux-kernel - [PATCH v2 1/2] HID: i2c-hid: introduce re-power-on quirk

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Message-ID: <20241031073419.9189-2-alex.vinarskis@gmail.com>
Date: Thu, 31 Oct 2024 08:31:41 +0100
From: Aleksandrs Vinarskis <alex.vinarskis@...il.com>
To: Jiri Kosina <jikos@...nel.org>,
	Hans de Goede <hdegoede@...hat.com>,
	linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Benjamin Tissoires <bentiss@...nel.org>,
	Bryan.Kemp@...l.com,
	laurentiu.tudor1@...l.com,
	Aleksandrs Vinarskis <alex.vinarskis@...il.com>
Subject: [PATCH v2 1/2] HID: i2c-hid: introduce re-power-on quirk

It appears some keyboards from vendor 'QTEC' will not work properly until
suspend & resume.

Empirically narrowed down to solution of re-sending power on command
_after_ initialization was completed before the end of initial probing.

Signed-off-by: Aleksandrs Vinarskis <alex.vinarskis@...il.com>
---
 drivers/hid/i2c-hid/i2c-hid-core.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c
index 43664a24176f..ad386ae878ef 100644
--- a/drivers/hid/i2c-hid/i2c-hid-core.c
+++ b/drivers/hid/i2c-hid/i2c-hid-core.c
@@ -51,6 +51,7 @@
 #define I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET	BIT(4)
 #define I2C_HID_QUIRK_NO_SLEEP_ON_SUSPEND	BIT(5)
 #define I2C_HID_QUIRK_DELAY_WAKEUP_AFTER_RESUME BIT(6)
+#define I2C_HID_QUIRK_RE_POWER_ON		BIT(7)
 
 /* Command opcodes */
 #define I2C_HID_OPCODE_RESET			0x01
@@ -1069,7 +1070,11 @@ static int i2c_hid_core_register_hid(struct i2c_hid *ihid)
 		return ret;
 	}
 
-	return 0;
+	/* At least some QTEC devices need this after initialization */
+	if (ihid->quirks & I2C_HID_QUIRK_RE_POWER_ON)
+		ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON);
+
+	return ret;
 }
 
 static int i2c_hid_core_probe_panel_follower(struct i2c_hid *ihid)
-- 
2.45.2