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/Documentation/devicetree/bindings/input/
Dclps711x-keypad.txt4 - compatible: Shall contain "cirrus,ep7209-keypad".
5 - row-gpios: List of GPIOs used as row lines.
6 - poll-interval: Poll interval time in milliseconds.
7 - linux,keymap: The definition can be found at
8 bindings/input/matrix-keymap.txt.
11 - autorepeat: Enable autorepeat feature.
15 compatible = "cirrus,ep7312-keypad", "cirrus,ep7209-keypad";
17 poll-interval = <120>;
18 row-gpios = <&porta 0 0>,
Dgpio-keys.yaml1 # SPDX-License-Identifier: GPL-2.0-only
3 ---
4 $id: http://devicetree.org/schemas/input/gpio-keys.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Rob Herring <robh@kernel.org>
15 - gpio-keys
16 - gpio-keys-polled
23 poll-interval: true
26 …"^(button|event|key|switch|(button|event|key|switch)-[a-z0-9-]+|[a-z0-9-]+-(button|event|key|switc…
35 - items:
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Dinput.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Dmitry Torokhov <dmitry.torokhov@gmail.com>
21 $ref: /schemas/types.yaml#/definitions/uint32-array
34 linux,input-type:
37 - 1 # EV_KEY
38 - 2 # EV_REL
39 - 3 # EV_ABS
40 - 5 # EV_SW
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Dfsl,mpr121-touchkey.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/input/fsl,mpr121-touchkey.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Dmitry Torokhov <dmitry.torokhov@gmail.com>
15 https://www.nxp.com/docs/en/data-sheet/MPR121.pdf
18 - $ref: input.yaml#
21 - required: [ interrupts ]
22 - required: [ poll-interval ]
26 const: fsl,mpr121-touchkey
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Dadc-joystick.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2 # Copyright 2019-2020 Artur Rojek
4 ---
5 $id: http://devicetree.org/schemas/input/adc-joystick.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 - Artur Rojek <contact@artur-rojek.eu>
18 - $ref: input.yaml#
22 const: adc-joystick
24 io-channels:
31 https://github.com/devicetree-org/dt-schema/blob/master/schemas/iio/iio-consumer.yaml
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Dadc-keys.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/input/adc-keys.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Alexandre Belloni <alexandre.belloni@bootlin.com>
13 - $ref: input.yaml#
17 const: adc-keys
19 io-channels:
22 io-channel-names:
25 keyup-threshold-microvolt:
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/Documentation/hwmon/
Dacpi_power_meter.rst17 -----------
21 features--a power meter that returns average power use over a configurable
22 interval, an optional capping mechanism, and a couple of trip points. The
24 of Documentation/hwmon/sysfs-interface.rst.
27 ----------------
29 The `power[1-*]_is_battery` knob indicates if the power supply is a battery.
30 Both `power[1-*]_average_{min,max}` must be set before the trip points will work.
32 socket and a poll notification will be sent to the appropriate
33 `power[1-*]_average` sysfs file.
35 The `power[1-*]_{model_number, serial_number, oem_info}` fields display
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Dsysfs-interface.rst5 through the sysfs interface. Since lm-sensors 3.0.0, libsensors is
6 completely chip-independent. It assumes that all the kernel drivers
10 This is a major improvement compared to lm-sensors 2.
22 For this reason, even if we aim at a chip-independent libsensors, it will
37 Up to lm-sensors 3.0.0, libsensors looks for hardware monitoring attributes
38 in the "physical" device directory. Since lm-sensors 3.0.1, attributes found
61 to cause an alarm) is chip-dependent.
69 ----------------
76 -------------------------------------------------------------------------
79 `[0-*]` denotes any positive number starting from 0
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/Documentation/virt/kvm/
Dhalt-polling.rst1 .. SPDX-License-Identifier: GPL-2.0
16 the order of a few micro-seconds, although performance benefits are workload
18 interval or some other task on the runqueue is runnable the scheduler is
27 The powerpc kvm-hv specific case is implemented in:
31 Halt Polling Interval
34 The maximum time for which to poll before invoking the scheduler, referred to
35 as the halt polling interval, is increased and decreased based on the perceived
39 kvm_vcpu->halt_poll_ns
41 or in the case of powerpc kvm-hv, in the vcore struct:
43 kvmppc_vcore->halt_poll_ns
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/Documentation/devicetree/bindings/power/supply/
Dcharger-manager.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/power/supply/charger-manager.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Sebastian Reichel <sre@kernel.org>
18 const: charger-manager
20 cm-chargers:
22 $ref: /schemas/types.yaml#/definitions/string-array
24 cm-num-chargers:
28 cm-fuel-gauge:
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Dbq24735.yaml1 # SPDX-License-Identifier: GPL-2.0
4 ---
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
8 title: TI BQ24735 Li-Ion Battery Charger
11 - Sebastian Reichel <sre@kernel.org>
14 - $ref: power-supply.yaml#
27 ti,ac-detect-gpios:
35 ti,charge-current:
43 ti,charge-voltage:
51 ti,input-current:
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/Documentation/userspace-api/media/v4l/
Duser-func.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
3 .. _user-func:
13 func-close
14 func-ioctl
15 vidioc-create-bufs
16 vidioc-cropcap
17 vidioc-dbg-g-chip-info
18 vidioc-dbg-g-register
19 vidioc-decoder-cmd
20 vidioc-dqevent
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Dfunc-read.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
4 .. _func-read:
13 v4l2-read - Read from a V4L2 device
18 .. code-block:: c
52 :c:func:`poll()` functions can always be used to suspend
55 :c:func:`poll()`.
64 only the period of the vertical blanking interval is available for
101 :c:func:`read()` was interrupted by a signal. On error, -1 is
107 Non-blocking I/O has been selected using O_NONBLOCK and no data was
/Documentation/accounting/
Dpsi.rst4 PSI - Pressure Stall Information
14 either play it safe and under-utilize their hardware resources, or
23 scarcity aids users in sizing workloads to hardware--or provisioning
38 respective file in /proc/pressure/ -- cpu, memory, and io.
48 The "full" line indicates the share of time in which all non-idle
70 Users can register triggers and use poll() to be woken up when resource
80 used to wait for trigger events using select(), poll() or epoll().
92 file descriptor is required to be able to poll it separately from others,
103 monitoring update interval is 50ms and max is 1s. Min limit is set to
116 Notifications to the userspace are rate-limited to one per tracking window.
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/Documentation/ABI/testing/
Dsysfs-class-hwmon16 The contents of the label are free-form.
22 The interval at which the chip will update readings.
27 Some devices have a variable update rate or interval.
135 this voltage channel is being used for, and user-space
137 user-space.
145 When disabled the sensor read will return -ENODATA.
147 - 1: Enable
148 - 0: Disable
156 - 1: Failed
157 - 0: Ok
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Ddebugfs-driver-qat4 Contact: qat-linux@intel.com
15 Contact: qat-linux@intel.com
19 This period should reflect planned polling interval of device
35 Contact: qat-linux@intel.com
44 Contact: qat-linux@intel.com
54 Contact: qat-linux@intel.com
57 Returns 0 when device is healthy or -1 when is unresponsive
61 to poll the status periodically.
66 Contact: qat-linux@intel.com
75 Contact: qat-linux@intel.com
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Dsysfs-bus-siox1 What: /sys/bus/siox/devices/siox-X/active
3 Contact: Thorsten Scherer <t.scherer@eckelmann.de>, Uwe Kleine-König <u.kleine-koenig@pengutronix.d…
9 does a push-pull cycle to write and read data from the
14 What: /sys/bus/siox/devices/siox-X/device_add
16 Contact: Thorsten Scherer <t.scherer@eckelmann.de>, Uwe Kleine-König <u.kleine-koenig@pengutronix.d…
18 Write-only file. Write
31 What: /sys/bus/siox/devices/siox-X/device_remove
33 Contact: Thorsten Scherer <t.scherer@eckelmann.de>, Uwe Kleine-König <u.kleine-koenig@pengutronix.d…
35 Write-only file. A single write removes the last device in the siox chain.
37 What: /sys/bus/siox/devices/siox-X/poll_interval_ns
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Dsysfs-bus-usb10 This allows to avoid side-effects with drivers
28 drivers, non-authorized one are not. By default, wired
33 Contact: linux-usb@vger.kernel.org
67 What: /sys/bus/usb-serial/drivers/.../new_id
69 Contact: linux-usb@vger.kernel.org
72 extra bus folder "usb-serial" in sysfs; apart from that
97 If CONFIG_PM is set and a USB 2.0 lpm-capable device is plugged
113 If CONFIG_PM is set and a USB 3.0 lpm-capable device is plugged
141 attribute allows user-space to know whether the device is
145 an on-screen keyboard if the only wireless keyboard is
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/Documentation/power/
Dcharger-manager.rst7 Charger Manager provides in-kernel battery charger management that
8 requires temperature monitoring during suspend-to-RAM state
12 Charger Manager is a platform_driver with power-supply-class entries.
13 An instance of Charger Manager (a platform-device created with Charger-Manager)
26 own power-supply-class and each power-supply-class can provide
28 aggregates charger-related information from multiple sources and
29 shows combined information as a single power-supply-class.
31 * Support for in suspend-to-RAM polling (with suspend_again callback)
32 While the battery is being charged and the system is in suspend-to-RAM,
50 * Support for premature full-battery event handling
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/Documentation/usb/
Dusbmon.rst15 The usbmon reports requests made by peripheral-specific drivers to Host
35 ----------
41 # mount -t debugfs none_debugs /sys/kernel/debug
56 ------------------------------------------------
58 Run "cat /sys/kernel/debug/usb/devices", and find the T-line which corresponds
61 /sys/kernel/debug/usb/devices outputs. The T-line will have a bus number.
77 --------------
92 -----------------------------------------------
98 -----------
100 Usually it's done with a keyboard interrupt (Control-C).
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/Documentation/virt/kvm/x86/
Dmsr.rst1 .. SPDX-License-Identifier: GPL-2.0
4 KVM-specific MSRs
16 ---------------
24 4-byte alignment physical address of a memory area which must be
42 An odd version indicates an in-progress update.
53 Note that although MSRs are per-CPU entities, the effect of this
63 4-byte aligned physical address of a memory area which must be in
79 write, or registration, is needed for each VCPU. The interval between
80 updates of this structure is arbitrary and implementation-dependent.
89 An odd version indicates an in-progress update.
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/Documentation/admin-guide/pm/
Dcpuidle.rst1 .. SPDX-License-Identifier: GPL-2.0
27 CPU idle time management is an energy-efficiency feature concerned about using
31 ------------
37 software as individual single-core processors. In other words, a CPU is an
46 Second, if the processor is multi-core, each core in it is able to follow at
61 Finally, each core in a multi-core processor may be able to follow more than one
66 multiple individual single-core "processors", referred to as *hardware threads*
67 (or hyper-threads specifically on Intel hardware), that each can follow one
78 ---------
112 .. _idle-loop:
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/Documentation/admin-guide/laptops/
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/networking/
Dip-sysctl.rst1 .. SPDX-License-Identifier: GPL-2.0
10 ip_forward - BOOLEAN
11 - 0 - disabled (default)
12 - not 0 - enabled
20 ip_default_ttl - INTEGER
25 ip_no_pmtu_disc - INTEGER
27 fragmentation-required ICMP is received, the PMTU to this
38 accept fragmentation-needed errors if the underlying protocol
48 Possible values: 0-3
52 min_pmtu - INTEGER
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/Documentation/driver-api/usb/
Dusb.rst1 .. _usb-hostside-api:
4 The Linux-USB Host Side API
18 That master/slave asymmetry was designed-in for a number of reasons, one
22 distributed auto-configuration since the pre-designated master node
37 USB Host-Side API Model
40 Host-side drivers for USB devices talk to the "usbcore" APIs. There are
41 two. One is intended for *general-purpose* drivers (exposed through
49 - USB supports four kinds of data transfers (control, bulk, interrupt,
54 - The device description model includes one or more "configurations"
60 - From USB 3.0 on configurations have one or more "functions", which
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