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/Documentation/ABI/testing/
Dsysfs-bus-iio-temperature-max318563 Contact: linux-iio@vger.kernel.org
5 Open-circuit fault. The detection of open-circuit faults,
10 '1' An open circuit such as broken thermocouple wires
12 '0' No open circuit or broken thermocouple wires are detected
17 Contact: linux-iio@vger.kernel.org
21 cables by integrated MOSFETs at the T+ and T- inputs, and the
Dsysfs-class-led-flash55 Flash faults are re-read after strobing the flash. Possible
58 * led-over-voltage
61 * flash-timeout-exceeded
65 * controller-over-temperature
68 * controller-short-circuit
69 the short circuit protection
71 * led-power-supply-over-current
75 * indicator-led-fault
77 a short or open circuit condition on the indicator LED
78 * led-under-voltage
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/Documentation/devicetree/bindings/power/supply/
Dbattery.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Sebastian Reichel <sre@kernel.org>
14 In smart batteries, these are typically stored in non-volatile memory
16 no appropriate non-volatile memory, or it is unprogrammed/incorrect.
27 Batteries must be referenced by chargers and/or fuel-gauges using a phandle.
28 The phandle's property should be named "monitored-battery".
32 const: simple-battery
34 over-voltage-threshold-microvolt:
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/Documentation/devicetree/bindings/watchdog/
Dgpio-wdt.txt1 * GPIO-controlled Watchdog
4 - compatible: Should contain "linux,wdt-gpio".
5 - gpios: From common gpio binding; gpio connection to WDT reset pin.
6 - hw_algo: The algorithm used by the driver. Should be one of the
8 - toggle: Either a high-to-low or a low-to-high transition clears
10 left floating or connected to a three-state buffer.
11 - level: Low or high level starts counting WDT timeout,
14 - hw_margin_ms: Maximum time to reset watchdog circuit (milliseconds).
17 - always-running: If the watchdog timer cannot be disabled, add this flag to
19 to toggle the signal when the device is open and the timeout elapsed.
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/Documentation/userspace-api/media/dvb/
Dfe-diseqc-send-burst.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
13 FE_DISEQC_SEND_BURST - Sends a 22KHz tone burst for 2x1 mini DiSEqC satellite selection.
26 File descriptor returned by :c:func:`open()`.
39 `Digital Satellite Equipment Control (DiSEqC) - Simple "ToneBurst" Detection Circuit specification.…
46 On error -1 is returned, and the ``errno`` variable is set
50 :ref:`Generic Error Codes <gen-errors>` chapter.
Dintro.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
17 part I of the MPEG2 specification ISO/IEC 13818 (aka ITU-T H.222), i.e
19 meant by a packetized elementary stream (PES) or an I-frame.
23 - European standards (DVB): http://www.dvb.org and/or http://www.etsi.org.
24 - American standards (ATSC): https://www.atsc.org/standards/
25 - Japanese standards (ISDB): http://www.dibeg.org/
44 based on open standards, Nokia and Convergence made it available to all
65 .. kernel-figure:: dvbstb.svg
71 A Digital TV card or set-top-box (STB) usually consists of the
76 antenna or directly from cable. The frontend down-converts and
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/Documentation/devicetree/bindings/pinctrl/
Dcirrus,madera.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - patches@opensource.cirrus.com
30 Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
33 pinctrl-0:
38 pinctrl-names:
43 pin-settings:
50 '-pins$':
53 - $ref: "pincfg-node.yaml#"
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/Documentation/driver-api/serial/
Dserial-iso7816.rst8 ISO/IEC7816 is a series of standards specifying integrated circuit cards (ICC)
11 2. Hardware-related considerations
14 Some CPUs/UARTs (e.g., Microchip AT91) contain a built-in mode capable of
19 available at user-level to allow switching from one mode to the other, and
35 4. Usage from user-level
38 From user-level, ISO7816 configuration can be get/set using the previous
46 /* Open your specific device (e.g., /dev/mydevice): */
47 int fd = open ("/dev/mydevice", O_RDWR);
/Documentation/userspace-api/media/v4l/
Dext-ctrls-flash.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
3 .. _flash-controls:
17 .. _flash-controls-use-cases:
24 ------------------------------------------
35 ----------------------------------------
37 The synchronised LED flash is pre-programmed by the host (power and
46 ------------------
52 .. _flash-control-id:
55 -----------------
61 Defines the mode of the flash LED, the high-power white LED attached
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Dvidioc-enuminput.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
13 VIDIOC_ENUMINPUT - Enumerate video inputs
26 File descriptor returned by :c:func:`open()`.
45 .. flat-table:: struct v4l2_input
46 :header-rows: 0
47 :stub-columns: 0
50 * - __u32
51 - ``index``
52 - Identifies the input, set by the application.
53 * - __u8
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/Documentation/driver-api/gpio/
Ddriver.rst26 between 0 and n-1, n being the number of GPIOs managed by the chip.
29 example if a system uses a memory-mapped set of I/O-registers where 32 GPIO
30 lines are handled by one bit per line in a 32-bit register, it makes sense to
44 So for example one platform could use global numbers 32-159 for GPIOs, with a
46 global numbers 0..63 with one set of GPIO controllers, 64-79 with another type
47 of GPIO controller, and on one particular board 80-95 with an FPGA. The legacy
49 2000-2063 to identify GPIO lines in a bank of I2C GPIO expanders.
60 - methods to establish GPIO line direction
61 - methods used to access GPIO line values
62 - method to set electrical configuration for a given GPIO line
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Dlegacy.rst13 A "General Purpose Input/Output" (GPIO) is a flexible software-controlled
21 System-on-Chip (SOC) processors heavily rely on GPIOs. In some cases, every
22 non-dedicated pin can be configured as a GPIO; and most chips have at least
27 Most PC southbridges have a few dozen GPIO-capable pins (with only the BIOS
32 - Output values are writable (high=1, low=0). Some chips also have
34 value might be driven ... supporting "wire-OR" and similar schemes
35 for the other value (notably, "open drain" signaling).
37 - Input values are likewise readable (1, 0). Some chips support readback
38 of pins configured as "output", which is very useful in such "wire-OR"
40 input de-glitch/debounce logic, sometimes with software controls.
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/Documentation/hwmon/
Dadm9240.rst10 Addresses scanned: I2C 0x2c - 0x2f
20 Addresses scanned: I2C 0x2c - 0x2f
24 http://pdfserv.maxim-ic.com/en/ds/DS1780.pdf
30 Addresses scanned: I2C 0x2c - 0x2f
37 - Frodo Looijaard <frodol@dds.nl>,
38 - Philip Edelbrock <phil@netroedge.com>,
39 - Michiel Rook <michiel@grendelproject.nl>,
40 - Grant Coady <gcoady.lk@gmail.com> with guidance
44 ---------
46 chip MSB 5-bit address. Each chip reports a unique manufacturer
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Dasc7621.rst20 Andigilog has both the PECI and pre-PECI versions of the Heceta-6, as
21 Intel calls them. Heceta-6e has high frequency PWM and Heceta-6p has
23 Heceta-6e part and aSC7621 is the Heceta-6p part. They are both in
28 have used registers below 20h for vendor-specific functions in addition
29 to those in the Intel-specified vendor range.
32 The fan speed control uses this finer value to produce a "step-less" fan
33 PWM output. These two bytes are "read-locked" to guarantee that once a
34 high or low byte is read, the other byte is locked-in until after the
37 sheet says 10-bits of resolution, although you may find the lower bits
47 We offer GPIO features on the former VID pins. These are open-drain
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/Documentation/i2c/busses/
Di2c-parport.rst2 Kernel driver i2c-parport
7 This is a unified driver for several i2c-over-parallel-port adapters,
11 * i2c-philips-par
12 * i2c-elv
13 * i2c-velleman
14 * video/i2c-parport
25 * (type=6) Barco LPT->DVI (K5800236) adapter
27 * (type=8) VCT-jig
42 -------------------------
44 If you want to build you own i2c-over-parallel-port adapter, here is
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/Documentation/power/
Dpower_supply_class.rst8 properties to user-space.
60 +--------------------------------------------------------------------------+
61 | **Charge/Energy/Capacity - how to not confuse** |
62 +--------------------------------------------------------------------------+
66 | - `CHARGE_*` |
68 | - `ENERGY_*` |
70 | - `CAPACITY` |
72 +--------------------------------------------------------------------------+
102 open circuit voltage of the battery.
142 relative, time-based measurements.
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/Documentation/sound/designs/
Dcompress-offload.rst2 ALSA Compress-Offload API
5 Pierre-Louis.Bossart <pierre-louis.bossart@linux.intel.com>
18 in system-on-chip designs, and DSPs are also integrated in audio
20 reduction of power consumption compared to host-based
27 provide a control and data-streaming interface for audio DSPs.
29 The design of this API was inspired by the 2-year experience with the
39 - separation between byte counts and time. Compressed formats may have
41 may vary from frame-to-frame. As a result, it is not possible to
44 reliable audio-video synchronization, which requires precise
47 - Handling of multiple formats. PCM data only requires a specification
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/Documentation/devicetree/bindings/iio/temperature/
Dadi,ltc2983.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Analog Devices LTC2983 Multi-sensor Temperature system
10 - Nuno Sá <nuno.sa@analog.com>
13 Analog Devices LTC2983 Multi-Sensor Digital Temperature Measurement System
14 https://www.analog.com/media/en/technical-documentation/data-sheets/2983fc.pdf
19 - adi,ltc2983
27 adi,mux-delay-config-us:
38 adi,filter-notch-freq:
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/Documentation/networking/
Darcnet-hardware.rst1 .. SPDX-License-Identifier: GPL-2.0
11 2) This file is no longer Linux-specific. It should probably be moved out
17 e-mail apenwarr@worldvisions.ca with any settings for your particular card,
39 There are two "types" of ARCnet - STAR topology and BUS topology. This
46 well-designed standard. It uses something called "modified token passing"
47 which makes it completely incompatible with so-called "Token Ring" cards,
63 programming interface also means that when high-performance hardware
73 although they are generally kept down to the Ethernet-style 1500 bytes.
91 - Avery Pennraun <apenwarr@worldvisions.ca>
92 - Stephen A. Wood <saw@hallc1.cebaf.gov>
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/Documentation/devicetree/bindings/
Dvendor-prefixes.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/vendor-prefixes.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Rob Herring <robh@kernel.org>
19 "^(at25|devbus|dmacap|dsa|exynos|fsi[ab]|gpio-fan|gpio|gpmc|hdmi|i2c-gpio),.*": true
21 "^(pinctrl-single|#pinctrl-single|PowerPC),.*": true
22 "^(pl022|pxa-mmc|rcar_sound|rotary-encoder|s5m8767|sdhci),.*": true
23 "^(simple-audio-card|st-plgpio|st-spics|ts),.*": true
38 "^active-semi,.*":
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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/sound/
Dalsa-configuration.rst2 Advanced Linux Sound Architecture - Driver Configuration guide
38 ----------
47 limiting card index for auto-loading (1-8);
49 For auto-loading more than one card, specify this option
50 together with snd-card-X aliases.
63 Module snd-pcm-oss
64 ------------------
86 regarding opening the device. When this option is non-zero,
90 Module snd-rawmidi
91 ------------------
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