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Message-ID: <20250407152705.1222469-1-superm1@kernel.org>
Date: Mon, 7 Apr 2025 10:27:04 -0500
From: Mario Limonciello <superm1@...nel.org>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>,
Shyam Sundar S K <Shyam-sundar.S-k@....com>,
Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Hans de Goede <hdegoede@...hat.com>,
linux-input@...r.kernel.org (open list:INPUT (KEYBOARD, MOUSE, JOYSTICK, TOUCHSCREEN)...),
linux-kernel@...r.kernel.org (open list),
platform-driver-x86@...r.kernel.org (open list:AMD PMF DRIVER),
Mario Limonciello <mario.limonciello@....com>,
Armin Wolf <W_Armin@....de>
Subject: [PATCH 1/2] Input: Add a helper for reporting a screen lock key sequence
From: Mario Limonciello <mario.limonciello@....com>
In the PC industry KEY_SCREENLOCK isn't used as frequently as it used
to be. Modern versions of Windows [1], GNOME and KDE support "META" + "L"
to lock the screen. Modern hardware [2] also sends this sequence of
events for keys with a silkscreen for screen lock.
Introduced a helper input_report_lock_sequence() for drivers to utilize
if they want to send this sequence.
Link: https://support.microsoft.com/en-us/windows/keyboard-shortcuts-in-windows-dcc61a57-8ff0-cffe-9796-cb9706c75eec [1]
Link: https://www.logitech.com/en-us/shop/p/k860-split-ergonomic.920-009166 [2]
Suggested-by: Armin Wolf <W_Armin@....de>
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
drivers/input/input.c | 20 ++++++++++++++++++++
include/linux/input.h | 2 ++
2 files changed, 22 insertions(+)
diff --git a/drivers/input/input.c b/drivers/input/input.c
index ec4346f20efdd..dfeace85c4710 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -508,6 +508,26 @@ void input_copy_abs(struct input_dev *dst, unsigned int dst_axis,
}
EXPORT_SYMBOL(input_copy_abs);
+/**
+ * input_report_lock_sequence - Report key combination to lock the screen
+ * @dev: input device
+ *
+ * Key combination used in the PC industry since Windows 7 for locking display
+ * is META + L. This is also used in GNOME and KDE by default.
+ * See https://support.microsoft.com/en-us/windows/keyboard-shortcuts-in-windows-dcc61a57-8ff0-cffe-9796-cb9706c75eec
+ */
+void input_report_lock_sequence(struct input_dev *dev)
+{
+ input_report_key(dev, KEY_LEFTMETA, 1);
+ input_report_key(dev, KEY_L, 1);
+ input_sync(dev);
+ input_report_key(dev, KEY_L, 0);
+ input_sync(dev);
+ input_report_key(dev, KEY_LEFTMETA, 0);
+ input_sync(dev);
+}
+EXPORT_SYMBOL(input_report_lock_sequence);
+
/**
* input_grab_device - grabs device for exclusive use
* @handle: input handle that wants to own the device
diff --git a/include/linux/input.h b/include/linux/input.h
index 7d7cb0593a63e..16f7bef12f1c1 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -492,6 +492,8 @@ void input_set_abs_params(struct input_dev *dev, unsigned int axis,
void input_copy_abs(struct input_dev *dst, unsigned int dst_axis,
const struct input_dev *src, unsigned int src_axis);
+void input_report_lock_sequence(struct input_dev *dev);
+
#define INPUT_GENERATE_ABS_ACCESSORS(_suffix, _item) \
static inline int input_abs_get_##_suffix(struct input_dev *dev, \
unsigned int axis) \
--
2.43.0
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