https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 9561de3a55bed6bdd44a12820ba81ec416e705a7 authored by Linus Torvalds on 04 June 2023, 18:04:27 UTC
Linux 6.4-rc5
Linux 6.4-rc5
Tip revision: 9561de3
dual_accel_detect.h
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Helper code to detect 360 degree hinges (yoga) style 2-in-1 devices using 2 accelerometers
* to allow the OS to determine the angle between the display and the base of the device.
*
* On Windows these are read by a special HingeAngleService process which calls undocumented
* ACPI methods, to let the firmware know if the 2-in-1 is in tablet- or laptop-mode.
* The firmware may use this to disable the kbd and touchpad to avoid spurious input in
* tablet-mode as well as to report SW_TABLET_MODE info to the OS.
*
* Since Linux does not call these undocumented methods, the SW_TABLET_MODE info reported
* by various drivers/platform/x86 drivers is incorrect. These drivers use the detection
* code in this file to disable SW_TABLET_MODE reporting to avoid reporting broken info
* (instead userspace can derive the status itself by directly reading the 2 accels).
*/
#include <linux/acpi.h>
#include <linux/i2c.h>
static bool dual_accel_detect_bosc0200(void)
{
struct acpi_device *adev;
int count;
adev = acpi_dev_get_first_match_dev("BOSC0200", NULL, -1);
if (!adev)
return false;
count = i2c_acpi_client_count(adev);
acpi_dev_put(adev);
return count == 2;
}
static bool dual_accel_detect(void)
{
/* Systems which use a pair of accels with KIOX010A / KIOX020A ACPI ids */
if (acpi_dev_present("KIOX010A", NULL, -1) &&
acpi_dev_present("KIOX020A", NULL, -1))
return true;
/* Systems which use a single DUAL250E ACPI device to model 2 accels */
if (acpi_dev_present("DUAL250E", NULL, -1))
return true;
/* Systems which use a single BOSC0200 ACPI device to model 2 accels */
if (dual_accel_detect_bosc0200())
return true;
return false;
}