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52 lines
1.7 KiB
52 lines
1.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Helper code to detect 360 degree hinges (yoga) style 2-in-1 devices using 2 accelerometers |
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* to allow the OS to determine the angle between the display and the base of the device. |
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* |
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* On Windows these are read by a special HingeAngleService process which calls undocumented |
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* ACPI methods, to let the firmware know if the 2-in-1 is in tablet- or laptop-mode. |
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* The firmware may use this to disable the kbd and touchpad to avoid spurious input in |
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* tablet-mode as well as to report SW_TABLET_MODE info to the OS. |
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* |
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* Since Linux does not call these undocumented methods, the SW_TABLET_MODE info reported |
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* by various drivers/platform/x86 drivers is incorrect. These drivers use the detection |
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* code in this file to disable SW_TABLET_MODE reporting to avoid reporting broken info |
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* (instead userspace can derive the status itself by directly reading the 2 accels). |
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*/ |
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#include <linux/acpi.h> |
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#include <linux/i2c.h> |
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static bool dual_accel_detect_bosc0200(void) |
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{ |
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struct acpi_device *adev; |
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int count; |
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adev = acpi_dev_get_first_match_dev("BOSC0200", NULL, -1); |
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if (!adev) |
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return false; |
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count = i2c_acpi_client_count(adev); |
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acpi_dev_put(adev); |
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return count == 2; |
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} |
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static bool dual_accel_detect(void) |
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{ |
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/* Systems which use a pair of accels with KIOX010A / KIOX020A ACPI ids */ |
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if (acpi_dev_present("KIOX010A", NULL, -1) && |
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acpi_dev_present("KIOX020A", NULL, -1)) |
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return true; |
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/* Systems which use a single DUAL250E ACPI device to model 2 accels */ |
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if (acpi_dev_present("DUAL250E", NULL, -1)) |
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return true; |
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/* Systems which use a single BOSC0200 ACPI device to model 2 accels */ |
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if (dual_accel_detect_bosc0200()) |
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return true; |
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return false; |
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}
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