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/Documentation/userspace-api/media/v4l/
Dvidioc-g-audioout.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
13 VIDIOC_G_AUDOUT - VIDIOC_S_AUDOUT - Query or select the current audio output
38 To query the current audio output applications zero out the ``reserved``
42 has no audio inputs, or none which combine with the current video
43 output.
45 Audio outputs have no writable properties. Nevertheless, to select the
46 current audio output applications can initialize the ``index`` field and
49 ``VIDIOC_S_AUDOUT`` ioctl. Drivers switch to the requested output or
51 write-only ioctl, it does not return the current audio output attributes
63 .. flat-table:: struct v4l2_audioout
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Dvidioc-g-output.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
13 VIDIOC_G_OUTPUT - VIDIOC_S_OUTPUT - Query or select the current video output
33 Pointer to an integer with output index.
38 To query the current video output applications call the
40 stores the number of the output, as in the struct
42 fail only when there are no video outputs, returning the ``EINVAL`` error
45 To select a video output applications store the number of the desired
46 output in an integer and call the :ref:`VIDIOC_S_OUTPUT <VIDIOC_G_OUTPUT>` ioctl with a
50 effects applications must select an output before querying or
59 On success 0 is returned, on error -1 and the ``errno`` variable is set
[all …]
Dvidioc-g-fbuf.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
13 VIDIOC_G_FBUF - VIDIOC_S_FBUF - Get or set frame buffer overlay parameters
40 :ref:`Video Overlay <overlay>` or :ref:`Video Output Overlay <osd>`
42 output device) and can be determined with the
46 The V4L2 API distinguishes destructive and non-destructive overlays. A
48 of a graphics card. A non-destructive overlay blends video images into a
49 VGA signal or graphics into a video signal. *Video Output Overlays* are
50 always non-destructive.
53 this is no longer needed, and it was always a very dangerous feature.
60 To set the parameters for a *Video Output Overlay*, applications must
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Dvidioc-streamon.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
13 VIDIOC_STREAMON - VIDIOC_STREAMOFF - Start or stop streaming I/O
39 the capture or output process during streaming
43 Capture hardware is disabled and no input buffers are filled (if there
45 has been called. Output hardware is disabled and no video signal is
48 Memory-to-memory devices will not start until ``VIDIOC_STREAMON`` has
49 been called for both the capture and output stream types.
58 all images enqueued for output but not transmitted yet. I/O returns to
84 no notion of starting or stopping "now". Buffer timestamps can be used
90 On success 0 is returned, on error -1 and the ``errno`` variable is set
[all …]
Ddev-osd.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
6 Video Output Overlay Interface
9 **Also known as On-Screen Display (OSD)**
11 Some video output devices can overlay a framebuffer image onto the
17 as the :ref:`Video Output <capture>` function.
22 capturing or output. The OSD function is only available after calling
29 Devices supporting the *Video Output Overlay* interface set the
57 ---------------------------------------------
59 .. code-block:: c
67 if (-1 == ioctl(fd, VIDIOC_G_FBUF, &fbuf)) {
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Daudio.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
10 capture devices have inputs, output devices have outputs, zero or more
11 each. Radio devices have no audio inputs or outputs. They have exactly
15 signal to a sound card is not considered an audio output.
20 more than one video input or output. Assumed two composite video inputs
26 number, starting at zero, of one audio input or output.
38 audio input and output, respectively.
49 output (which presently has no changeable properties) applications call
53 multiple selectable audio inputs, all audio output ioctls when the
63 .. code-block:: c
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Dfunc-open.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
4 .. _func-open:
13 v4l2-open - Open a V4L2 device
18 .. code-block:: c
32 technicality, input devices still support only reading and output
37 return the ``EAGAIN`` error code when no data is available or no
42 Other flags have no effect.
48 desired device name. This function has no side effects; all data format
49 parameters, current input or output, control values or other properties
58 -1 is returned, and the ``errno`` variable is set appropriately.
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Dvidioc-enumoutput.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
13 VIDIOC_ENUMOUTPUT - Enumerate video outputs
46 .. flat-table:: struct v4l2_output
47 :header-rows: 0
48 :stub-columns: 0
51 * - __u32
52 - ``index``
53 - Identifies the output, set by the application.
54 * - __u8
55 - ``name``\ [32]
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Dpixfmt-compressed.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
8 .. _compressed-formats:
18 .. flat-table:: Compressed Image Formats
19 :header-rows: 1
20 :stub-columns: 0
23 * - Identifier
24 - Code
25 - Details
26 * .. _V4L2-PIX-FMT-JPEG:
28 - ``V4L2_PIX_FMT_JPEG``
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Dvidioc-g-edid.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
13 VIDIOC_G_EDID - VIDIOC_S_EDID - VIDIOC_SUBDEV_G_EDID - VIDIOC_SUBDEV_S_EDID - Get or set the EDID o…
47 from a receiver or an output of a transmitter device. They can be used
48 with subdevice nodes (/dev/v4l-subdevX) or with video nodes
52 video capture devices) or output (for video output devices) index as is
55 with subdevice nodes the ``pad`` field represents the input or output
56 pad of the subdevice. If there is no EDID support for the given ``pad``
67 ``blocks`` to the actual number of blocks. If there are no EDID blocks
81 If there are no EDID blocks available at all, then
88 receivers as it makes no sense for a transmitter.
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Duserp.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
10 Input and output devices support this I/O method when the
21 data are exchanged, these pointers and meta-information are passed in
23 :c:type:`v4l2_plane` in the multi-planar API case). The
26 No buffers (planes) are allocated beforehand, consequently they are not
33 .. code-block:: c
41 if (ioctl (fd, VIDIOC_REQBUFS, &reqbuf) == -1) {
74 application waits until a filled buffer can be dequeued, and re-enqueues
75 the buffer when the data is no longer needed. Output applications fill
76 and enqueue buffers, when enough buffers are stacked up output is
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Dvideo.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
11 Video, S-Video and RGB connectors. Camera sensors are also considered to
13 VBI output devices have outputs, at least one each. Radio devices have
14 no video inputs or outputs.
26 the current video input or output. To select a different input or output
30 all the output ioctls when the device has one or more outputs.
35 .. code-block:: c
40 if (-1 == ioctl(fd, VIDIOC_G_INPUT, &index)) {
48 if (-1 == ioctl(fd, VIDIOC_ENUMINPUT, &input)) {
59 .. code-block:: c
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/Documentation/devicetree/bindings/sound/
Dti,tlv320dac3100.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Texas Instruments - tlv320aic31xx Codec module
10 - Shenghao Ding <shenghao-ding@ti.com>
13 CODEC output pins:
28 The pins can be used in referring sound node's audio-routing property.
33 - ti,tlv320aic310x # - Generic TLV320AIC31xx with mono speaker amp
34 - ti,tlv320aic311x # - Generic TLV320AIC31xx with stereo speaker amp
35 - ti,tlv320aic3100 # - TLV320AIC3100 (mono speaker amp, no MiniDSP)
[all …]
Dmax98373.txt7 - compatible : "maxim,max98373"
9 - reg : the I2C address of the device.
13 - maxim,vmon-slot-no : slot number used to send voltage information
18 - maxim,imon-slot-no : slot number used to send current information
21 - maxim,spkfb-slot-no : slot number used to send speaker feedback information
24 - maxim,interleave-mode : For cases where a single combined channel
26 to share a single data output channel on alternating frames.
28 on a single output channel.
36 maxim,vmon-slot-no = <0>;
37 maxim,imon-slot-no = <1>;
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Dadi,max98388.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Ryan Lee <ryans.lee@analog.com>
13 The MAX98388 is a mono Class-D speaker amplifier with I/V feedback.
18 - $ref: dai-common.yaml#
23 - adi,max98388
28 '#sound-dai-cells':
31 adi,vmon-slot-no:
38 adi,imon-slot-no:
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/Documentation/networking/
Dxfrm_proc.rst1 .. SPDX-License-Identifier: GPL-2.0
4 XFRM proc - /proc/net/xfrm_* files
7 Masahide NAKAMURA <nakam@linux-ipv6.org>
11 -------------------------
26 No buffer is left
32 No state is found
57 No matching template for states
61 No policy is found for states
62 e.g. Inbound SAs are correct but no SP is found
77 …State direction mismatch (lookup found an output state on the input path, expected input or no dir…
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/Documentation/devicetree/bindings/i2c/
Di2c-gpio.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/i2c/i2c-gpio.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Wolfram Sang <wsa@kernel.org>
13 - $ref: /schemas/i2c/i2c-controller.yaml#
18 - const: i2c-gpio
20 sda-gpios:
24 from <dt-bindings/gpio/gpio.h> since the signal is by definition
28 scl-gpios:
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/Documentation/devicetree/bindings/pinctrl/
Dpincfg-node.yaml1 # SPDX-License-Identifier: GPL-2.0-only
3 ---
4 $id: http://devicetree.org/schemas/pinctrl/pincfg-node.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Linus Walleij <linus.walleij@linaro.org>
21 bias-disable:
25 bias-high-impedance:
27 description: high impedance mode ("third-state", "floating")
29 bias-bus-hold:
33 bias-pull-up:
[all …]
Dste,nomadik.txt4 - compatible: "stericsson,db8500-pinctrl", "stericsson,db8540-pinctrl",
5 "stericsson,stn8815-pinctrl"
6 - nomadik-gpio-chips: array of phandles to the corresponding GPIO chips
8 - prcm: phandle to the PRCMU managing the back end of this pin controller
10 Please refer to pinctrl-bindings.txt in this directory for details of the
18 parameters, such as input, output, pull up, pull down...
23 (see pinctrl-bindings.txt):
26 - function: A string containing the name of the function to mux to the
28 - groups : An array of strings. Each string contains the name of a pin
30 set-up.
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/Documentation/arch/sparc/oradax/
Ddax-hv-api.txt3 Publication date 2017-09-25 08:21
5 Extracted via "pdftotext -f 547 -l 572 -layout sun4v_20170925.pdf"
16 live-migration and other system management activities.
20 …high speed processoring of database-centric operations. The coprocessors may support one or more of
28 …e Completion Area and, unless execution order is specifically restricted through the use of serial-
38 …There is no fixed limit on the number of outstanding CCBs guest software may have queued in the vi…
45 …device node in the guest MD (Section 8.24.17, “Database Analytics Accelerators (DAX) virtual-device
51 36.1.1.1. "ORCL,sun4v-dax" Device Compatibility
54 • No-op/Sync
77 …See Section 36.2.1, “Query CCB Command Formats” for the corresponding CCB input and output formats.
[all …]
/Documentation/devicetree/bindings/clock/st/
Dst,quadfs.txt10 [1] Documentation/devicetree/bindings/clock/clock-bindings.txt
13 - compatible : shall be:
15 "st,quadfs-d0"
16 "st,quadfs-d2"
17 "st,quadfs-d3"
18 "st,quadfs-pll"
21 - #clock-cells : from common clock binding; shall be set to 1.
23 - reg : A Base address and length of the register set.
25 - clocks : from common clock binding
27 - clock-output-names : From common clock binding. The block has 4
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/Documentation/leds/
Dleds-lp5523.rst9 Contact: Samu Onkalo (samu.p.onkalo-at-nokia.com)
12 -----------
15 The name of each channel is configurable in the platform data - name and label.
22 - /sys/class/leds/R1 (name: 'R1')
23 - /sys/class/leds/B1 (name: 'B1')
25 b) Use the 'label' with no 'name' field
28 - /sys/class/leds/RGB:channelN (label: 'RGB', N: 0 ~ 8)
33 - /sys/class/leds/lp5523:channelN (N: 0 ~ 8)
38 1) Legacy interface - enginex_mode, enginex_load and enginex_leds
63 2) Firmware interface - LP55xx common interface
[all …]
/Documentation/doc-guide/
Dchecktransupdate.rst1 .. SPDX-License-Identifier: GPL-2.0
7 different locales, i.e., whether the documentation is up-to-date with
11 ------------
15 from HEAD. If any differences occur, the file is considered as out-of-date,
20 - check all files in a certain locale
21 - check a single file or a set of files
22 - provide options to change output format
23 - track the translation status of files that have no translation
26 -----
30 ./scripts/checktransupdate.py --help
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/Documentation/ABI/testing/
Dsysfs-platform-wilco-ec16 Output will a MM/DD/YY string.
23 Output will a version string be similar to the example below:
31 Output will a version string be similar to the example below:
43 - In S0, the port will always provide power.
44 - In S0ix, if usb_charge is enabled, then power will be
46 Else no power is supplied.
47 - In S5, if usb_charge is enabled, then power will be supplied
48 to the port when on AC. Else no power is supplied.
Dsysfs-class-regulator16 'enabled' means the regulator output is ON and is supplying
17 power to the system (assuming no error prevents it).
19 'disabled' means the regulator output is OFF and is not
20 supplying power to the system (unless some non-Linux
27 or microamps to determine configured regulator output levels.
34 regulators which can report that output value.
38 - off
39 - on
40 - error
41 - fast
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