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/Documentation/admin-guide/laptops/
Dlg-laptop.rst1 .. SPDX-License-Identifier: GPL-2.0+
7 By Matan Ziv-Av <matan@svgalib.org>
11 -------
15 - FN-F1 (LG control panel) - Generates F15
16 - FN-F5 (Touchpad toggle) - Generates F21
17 - FN-F6 (Airplane mode) - Generates RFKILL
18 - FN-F9 (Reader mode) - Generates F14
24 -----------
26 Writing 0/1 to /sys/devices/platform/lg-laptop/reader_mode disables/enables
28 and the reader mode indicator LED (on F9 key) turns on.
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Dthinkpad-acpi.rst9 - Borislav Deianov <borislav@users.sf.net>
10 - Henrique de Moraes Holschuh <hmh@hmh.eng.br>
12 http://ibm-acpi.sf.net/
19 This driver used to be named ibm-acpi until kernel 2.6.21 and release
20 0.13-20070314. It used to be in the drivers/acpi tree, but it was
21 moved to the drivers/misc tree and renamed to thinkpad-acpi for kernel
25 The driver is named "thinkpad-acpi". In some places, like module
29 "tpacpi" is used as a shorthand where "thinkpad-acpi" would be too
33 ------
38 - Fn key combinations
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/Documentation/devicetree/bindings/leds/
Dleds-sgm3140.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/leds/leds-sgm3140.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: SGMICRO SGM3140 500mA Buck/Boost Charge Pump LED Driver
10 - Luca Weiss <luca@z3ntu.xyz>
13 The SGM3140 is a current-regulated charge pump which can regulate two current
17 http://www.sg-micro.com/uploads/soft/20190626/1561535688.pdf
22 - ocs,ocp8110
23 - richtek,rt5033-led
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Dsilergy,sy7802.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Silergy SY7802 1800mA Boost Charge Pump LED Driver
10 - André Apitzsch <git@apitzsch.eu>
13 The SY7802 is a current-regulated charge pump which can regulate two current
16 The SY7802 is a high-current synchronous boost converter with 2-channel
22 - silergy,sy7802
27 enable-gpios:
31 flash-gpios:
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Dleds-lp55xx.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/leds/leds-lp55xx.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: TI/National Semiconductor LP55xx and LP8501 LED Drivers
10 - Jacek Anaszewski <jacek.anaszewski@gmail.com>
11 - Pavel Machek <pavel@ucw.cz>
15 LED Drivers.
27 - national,lp5521
28 - national,lp5523
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Dqcom,pm8058-led.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/leds/qcom,pm8058-led.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Qualcomm PM8058 PMIC LED
10 - Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
13 The Qualcomm PM8058 contains an LED block for up to six LEDs:: three normal
14 LEDs, two "flash" LEDs and one "keypad backlight" LED. The names are quoted
15 because sometimes these LED drivers are used for wildly different things than
17 hard-wired usecase.
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Dleds-gpio.yaml1 # SPDX-License-Identifier: GPL-2.0-only
3 ---
4 $id: http://devicetree.org/schemas/leds/leds-gpio.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Jacek Anaszewski <jacek.anaszewski@gmail.com>
11 - Pavel Machek <pavel@ucw.cz>
14 Each LED is represented as a sub-node of the gpio-leds device. Each
15 node's name represents the name of the corresponding LED.
19 const: gpio-leds
22 # The first form is preferred, but fall back to just 'led' anywhere in the
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/Documentation/power/
Dpower_supply_class.rst8 properties to user-space.
24 It also integrates with LED framework, for the purpose of providing
28 user and/or specific machine defaults, per design principles of LED
60 +--------------------------------------------------------------------------+
61 | **Charge/Energy/Capacity - how to not confuse** |
62 +--------------------------------------------------------------------------+
63 | **Because both "charge" (µAh) and "energy" (µWh) represents "capacity" |
66 | - `CHARGE_*` |
68 | - `ENERGY_*` |
70 | - `CAPACITY` |
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/Documentation/devicetree/bindings/mfd/
Dmaxim,max77693.yaml1 # SPDX-License-Identifier: GPL-2.0-only
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Chanwoo Choi <cw00.choi@samsung.com>
11 - Krzysztof Kozlowski <krzk@kernel.org>
18 includes voltage current regulators, charger, LED/flash, haptic motor driver
34 led:
37 max77693-muic:
44 const: maxim,max77693-muic
47 - compatible
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Drichtek,rt5033.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Jakob Hauser <jahau@rocketmail.com>
14 flash LED current source, LDO and synchronous Buck converter for portable
30 The regulators of RT5033 have to be instantiated under a sub-node named
44 $ref: /schemas/power/supply/richtek,rt5033-charger.yaml#
47 - compatible
48 - reg
49 - interrupts
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/Documentation/leds/
Dleds-class.rst2 LED handling under Linux
5 In its simplest form, the LED class just allows control of LEDs from
7 LED is defined in max_brightness file. The brightness file will set the brightness
8 of the LED (taking a value 0-max_brightness). Most LEDs don't have hardware
9 brightness support so will just be turned on for non-zero brightness settings.
11 The class also introduces the optional concept of an LED trigger. A trigger
12 is a kernel based source of led events. Triggers can either be simple or
14 existing subsystems with minimal additional code. Examples are the disk-activity,
15 nand-disk and sharpsl-charge triggers. With led triggers disabled, the code
18 Complex triggers while available to all LEDs have LED specific
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/Documentation/devicetree/bindings/regulator/
Dmaxim,max8997.yaml1 # SPDX-License-Identifier: GPL-2.0-only
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Krzysztof Kozlowski <krzk@kernel.org>
15 motor driver, flash LED driver and Micro-USB Interface Controller.
22 const: maxim,max8997-pmic
24 charger-supply:
30 - description: irq1 interrupt
31 - description: alert interrupt
33 max8997,pmic-buck1-dvs-voltage:
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/Documentation/hid/
Dhidintro.rst1 .. SPDX-License-Identifier: GPL-2.0
8 descriptors are, and of how a casual (non-kernel) programmer can deal
18 hidreport-parsing
48 The HID subsystem is in charge of parsing the HID report descriptors,
50 Documentation/hid/hid-transport.rst). Devices may misbehave because the
60 <https://www.usb.org/document-library/device-class-definition-hid-111>`_ (HID Spec from now on)
61 * the `HID Usage Tables <https://usb.org/document-library/hid-usage-tables-14>`_ (HUT from now on)
64 (USB, I2C, Bluetooth, etc.). See Documentation/hid/hid-transport.rst.
73 $ hexdump -C /sys/bus/hid/devices/0003\:093A\:2510.0002/report_descriptor
95 Documentation/hid/hidreport-parsing.rst; you only need to understand it
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/Documentation/admin-guide/
Dcgroup-v2.rst1 .. _cgroup-v2:
11 conventions of cgroup v2. It describes all userland-visible aspects
14 v1 is available under :ref:`Documentation/admin-guide/cgroup-v1/index.rst <cgroup-v1>`.
19 1-1. Terminology
20 1-2. What is cgroup?
22 2-1. Mounting
23 2-2. Organizing Processes and Threads
24 2-2-1. Processes
25 2-2-2. Threads
26 2-3. [Un]populated Notification
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Dkernel-parameters.txt16 force -- enable ACPI if default was off
17 on -- enable ACPI but allow fallback to DT [arm64,riscv64]
18 off -- disable ACPI if default was on
19 noirq -- do not use ACPI for IRQ routing
20 strict -- Be less tolerant of platforms that are not
22 rsdt -- prefer RSDT over (default) XSDT
23 copy_dsdt -- copy DSDT to memory
24 nospcr -- disable console in ACPI SPCR table as
41 If set to vendor, prefer vendor-specific driver
73 Documentation/firmware-guide/acpi/debug.rst for more information about
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