| /Documentation/admin-guide/media/ |
| D | cec.rst | 4 HDMI CEC
14 - STIH4xx HDMI CEC
20 - amlogic (meson ao-cec and ao-cec-g12a)
26 - DisplayPort CEC-Tunneling-over-AUX on i915, nouveau and amdgpu
27 - ChromeOS EC CEC
28 - CEC for SECO boards (UDOO x86).
41 - Pulse-Eight: the pulse8-cec driver implements the following module option:
55 - vivid: emulates a CEC receiver and CEC transmitter.
56 Can be used to test CEC applications without actual CEC hardware.
58 - cec-gpio. If the CEC pin is hooked up to a GPIO pin then
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| D | building.rst | 52 [ ] HDMI CEC RC integration
53 [ ] Enable CEC error injection support
54 [*] HDMI CEC drivers --->
60 The ``HDMI CEC RC integration`` option enables integration of HDMI CEC
61 with Linux, allowing to receive data via HDMI CEC as if it were produced
64 The ``HDMI CEC drivers`` option allow selecting platform and USB drivers
65 that receives and/or transmits CEC codes via HDMI interfaces\ [3]_.
88 that use the media HDMI CEC support.
93 When a GPU driver supports HDMI CEC, it will automatically
94 enable the CEC core support at the media subsystem.
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| /Documentation/userspace-api/media/cec/ |
| D | cec-intro.rst | 10 HDMI cable to communicate. The protocol for CEC version 1.4 is defined
11 in supplements 1 (CEC) and 2 (HEAC or HDMI Ethernet and Audio Return
13 extensions added to CEC version 2.0 are defined in chapter 11 of the
21 CEC, need to be handled by the kernel, others can be handled either by
24 In addition, CEC can be implemented in HDMI receivers, transmitters and
26 control just the CEC pin.
28 Drivers that support CEC will create a CEC device node (/dev/cecX) to
29 give userspace access to the CEC adapter. The
34 provides three tools to handle CEC:
36 - cec-ctl: the Swiss army knife of CEC. Allows you to configure, transmit
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| D | cec-ioc-g-mode.rst | 2 .. c:namespace:: CEC
12 CEC_G_MODE, CEC_S_MODE - Get or set exclusive use of the CEC adapter
32 Pointer to CEC mode.
39 obtain exclusive access to the CEC adapter. This ioctl sets the
42 used to initiate messages, i.e. it commands other CEC devices. The
43 follower is the filehandle that receives messages sent to the CEC
47 When a CEC message is received, then the CEC framework will decide how
50 is waiting for it. In addition the CEC framework will process it.
52 If the message is not a reply, then the CEC framework will process it
60 The CEC framework will process core messages unless requested otherwise
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| D | cec-ioc-adap-g-log-addrs.rst | 2 .. c:namespace:: CEC
40 To query the current CEC logical addresses, applications call
55 values (CEC version 2.0, no vendor ID and an empty OSD name).
62 A :ref:`CEC_EVENT_STATE_CHANGE <CEC-EVENT-STATE-CHANGE>` event is sent when the
94 - The CEC version that this adapter shall use. See
95 :ref:`cec-versions`. Used to implement the
97 Note that :ref:`CEC_OP_CEC_VERSION_1_3A <CEC-OP-CEC-VERSION-1-3A>` is not allowed by the CEC
106 ignored. Note that the CEC 2.0 standard allows for a maximum of 2
110 what was requested. If this field is set to 0, then the CEC
121 - Flags. See :ref:`cec-log-addrs-flags` for a list of available flags.
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| D | cec-ioc-adap-g-caps.rst | 2 .. c:namespace:: CEC
33 All cec devices must support :ref:`ioctl CEC_ADAP_G_CAPS <CEC_ADAP_G_CAPS>`. To query
49 - The name of the cec adapter driver.
52 - The name of this CEC adapter. The combination ``driver`` and
59 - The capabilities of the CEC adapter, see
60 :ref:`cec-capabilities`.
63 - CEC Framework API version, formatted with the ``KERNEL_VERSION()``
70 .. flat-table:: CEC Capabilities Flags
75 * .. _`CEC-CAP-PHYS-ADDR`:
84 * .. _`CEC-CAP-LOG-ADDRS`:
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| D | cec-funcs.rst | 13 cec-func-open
14 cec-func-close
15 cec-func-ioctl
16 cec-func-poll
17 cec-ioc-adap-g-caps
18 cec-ioc-adap-g-log-addrs
19 cec-ioc-adap-g-phys-addr
20 cec-ioc-adap-g-conn-info
21 cec-ioc-dqevent
22 cec-ioc-g-mode
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| D | cec-func-ioctl.rst | 2 .. c:namespace:: CEC
7 cec ioctl()
13 cec-ioctl - Control a cec device
31 CEC ioctl request code as defined in the cec.h header file, for
40 The :c:func:`ioctl()` function manipulates cec device parameters. The
43 The ioctl ``request`` code specifies the cec function to be called. It
47 Macros and structures definitions specifying cec ioctl requests and
48 their parameters are located in the cec.h header file. All cec ioctl
50 :ref:`cec-user-func`.
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| D | cec-ioc-dqevent.rst | 2 .. c:namespace:: CEC
13 CEC_DQEVENT - Dequeue a CEC event
33 CEC devices can send asynchronous events. These can be retrieved by
43 two :ref:`CEC_EVENT_STATE_CHANGE <CEC-EVENT-STATE-CHANGE>` events with
93 replied to within a second according to the CEC specification,
114 - The CEC event type, see :ref:`cec-events`.
117 - Event flags, see :ref:`cec-event-flags`.
122 - The new adapter state as sent by the :ref:`CEC_EVENT_STATE_CHANGE <CEC-EVENT-STATE-CHANGE>`
126 - The number of lost messages as sent by the :ref:`CEC_EVENT_LOST_MSGS <CEC-EVENT-LOST-MSGS>`
135 .. flat-table:: CEC Events Types
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| D | cec-pin-error-inj.rst | 5 CEC Pin Framework Error Injection
8 The CEC Pin Framework is a core CEC framework for CEC hardware that only
9 has low-level support for the CEC bus. Most hardware today will have
10 high-level CEC support where the hardware deals with driving the CEC bus,
12 allows you to connect the CEC pin to a GPIO on e.g. a Raspberry Pi and
13 you have now made a CEC adapter.
17 test how well CEC adapters can handle error conditions.
19 Currently only the cec-gpio driver (when the CEC line is directly
24 through debugfs. Specifically, in ``/sys/kernel/debug/cec/cecX/`` there is
35 $ cat /sys/kernel/debug/cec/cec0/error-inj
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| D | cec-ioc-receive.rst | 2 .. c:namespace:: CEC
14 CEC_RECEIVE, CEC_TRANSMIT - Receive or transmit a CEC message
39 To receive a CEC message the application has to fill in the
50 1. a message received from another CEC device (the ``sequence`` field will
58 To send a CEC message the application has to fill in the struct
64 of 2-byte messages). Note that the CEC kernel framework will also reply
65 to core messages (see :ref:`cec-core-processing`), so it is not a good
79 However, the CEC specification allows sending messages from 'Unregistered' to
85 physical address, but the cable is still connected and CEC still works.
126 - A non-zero sequence number is automatically assigned by the CEC framework
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| D | cec-func-close.rst | 2 .. c:namespace:: CEC
7 cec close()
13 cec-close - Close a cec device
33 Closes the cec device. Resources associated with the file descriptor are
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| /Documentation/devicetree/bindings/media/cec/ |
| D | cec-gpio.yaml | 4 $id: http://devicetree.org/schemas/media/cec/cec-gpio.yaml#
7 title: HDMI CEC GPIO
13 The HDMI CEC GPIO module supports CEC implementations where the CEC line is
17 Please note:: the maximum voltage for the CEC line is 3.63V, for the HPD and
23 const: cec-gpio
25 cec-gpios:
28 GPIO that the CEC line is connected to. The line should be tagged as open
35 when the CEC line is not associated with an HDMI receiver/transmitter.
45 - cec-gpios
48 - $ref: cec-common.yaml#
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| D | amlogic,meson-gx-ao-cec.yaml | 5 $id: http://devicetree.org/schemas/media/cec/amlogic,meson-gx-ao-cec.yaml#
8 title: Amlogic Meson AO-CEC Controller
14 The Amlogic Meson AO-CEC module is present is Amlogic SoCs and its purpose is
15 to handle communication between HDMI connected devices over the CEC bus.
20 - amlogic,meson-gx-ao-cec # GXBB, GXL, GXM, G12A and SM1 AO_CEC_A module
21 - amlogic,meson-g12a-ao-cec # G12A AO_CEC_B module
22 - amlogic,meson-sm1-ao-cec # SM1 AO_CEC_B module
37 - $ref: cec-common.yaml#
43 - amlogic,meson-gx-ao-cec
49 - description: AO-CEC clock
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| D | nvidia,tegra114-cec.yaml | 4 $id: http://devicetree.org/schemas/media/cec/nvidia,tegra114-cec.yaml#
7 title: NVIDIA Tegra HDMI CEC
13 - $ref: cec-common.yaml#
18 - nvidia,tegra114-cec
19 - nvidia,tegra124-cec
20 - nvidia,tegra210-cec
27 - const: cec
50 cec@70015000 {
51 compatible = "nvidia,tegra124-cec";
55 clock-names = "cec";
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| D | st,stm32-cec.yaml | 4 $id: http://devicetree.org/schemas/media/cec/st,stm32-cec.yaml#
7 title: STMicroelectronics STM32 CEC
14 const: st,stm32-cec
29 - const: cec
30 - const: hdmi-cec
49 cec: cec@40006c00 {
50 compatible = "st,stm32-cec";
54 clock-names = "cec", "hdmi-cec";
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| D | st,stih-cec.yaml | 4 $id: http://devicetree.org/schemas/media/cec/st,stih-cec.yaml#
7 title: STMicroelectronics STIH4xx HDMI CEC
13 - $ref: cec-common.yaml#
17 const: st,stih-cec
24 - const: cec-clk
31 - const: cec-irq
54 cec@94a087c {
55 compatible = "st,stih-cec";
59 clock-names = "cec-clk";
62 interrupt-names = "cec-irq";
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| D | cec-common.yaml | 4 $id: http://devicetree.org/schemas/media/cec/cec-common.yaml#
7 title: HDMI CEC Adapters Common Properties
14 pattern: "^cec(@[0-9a-f]+|-[0-9]+)?$"
24 The CEC support is only available when the HPD is high. Some boards only
25 let the CEC pin through if the HPD is high, for example if there is a
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| D | samsung,s5p-cec.yaml | 4 $id: http://devicetree.org/schemas/media/cec/samsung,s5p-cec.yaml#
7 title: Samsung S5PV210 and Exynos HDMI CEC
14 - $ref: cec-common.yaml#
18 const: samsung,s5p-cec
54 cec@101b0000 {
55 compatible = "samsung,s5p-cec";
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| /Documentation/devicetree/bindings/display/mediatek/ |
| D | mediatek,cec.yaml | 4 $id: http://devicetree.org/schemas/display/mediatek/mediatek,cec.yaml#
7 title: Mediatek HDMI CEC Controller
14 The HDMI CEC controller handles hotplug detection and CEC communication.
19 - mediatek,mt7623-cec
20 - mediatek,mt8167-cec
21 - mediatek,mt8173-cec
45 cec: cec@10013000 {
46 compatible = "mediatek,mt8173-cec";
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| /Documentation/driver-api/media/ |
| D | cec-core.rst | 3 CEC Kernel Support
6 The CEC framework provides a unified kernel interface for use with HDMI CEC
14 The CEC Protocol
17 The CEC protocol enables consumer electronic devices to communicate with each
24 The CEC framework described here is up to date with the CEC 2.0 specification.
32 CEC Adapter Interface
35 The struct cec_adapter represents the CEC adapter hardware. It is created by
49 adapter operations which are called by the CEC framework and that you
57 the name of the CEC adapter. Note: this name will be copied.
60 capabilities of the CEC adapter. These capabilities determine the
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| /Documentation/devicetree/bindings/display/ |
| D | brcm,bcm2711-hdmi.yaml | 27 - description: CEC register range
39 - const: cec
47 - description: The HDMI CEC parent clock
54 - const: cec
58 - description: CEC TX interrupt
59 - description: CEC RX interrupt
60 - description: CEC stuck at low interrupt
67 - const: cec-tx
68 - const: cec-rx
69 - const: cec-low
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| /Documentation/ABI/testing/ |
| D | debugfs-cec-error-inj | 1 What: /sys/kernel/debug/cec/*/error-inj
6 The CEC Framework allows for CEC error injection commands through
35 part of the CEC documentation and must keep that documentation up to date
38 The following CEC error injection implementations exist:
40 - Documentation/userspace-api/media/cec/cec-pin-error-inj.rst
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| /Documentation/devicetree/bindings/media/i2c/ |
| D | adv7604.yaml | 36 - enum: [ avlink, cec, infoframe, esdp, dpp, afe, rep, edid, hdmi, test, cp, vdp ]
37 - enum: [ avlink, cec, infoframe, esdp, dpp, afe, rep, edid, hdmi, test, cp, vdp ]
38 - enum: [ avlink, cec, infoframe, esdp, dpp, afe, rep, edid, hdmi, test, cp, vdp ]
39 - enum: [ avlink, cec, infoframe, esdp, dpp, afe, rep, edid, hdmi, test, cp, vdp ]
40 - enum: [ avlink, cec, infoframe, esdp, dpp, afe, rep, edid, hdmi, test, cp, vdp ]
41 - enum: [ avlink, cec, infoframe, esdp, dpp, afe, rep, edid, hdmi, test, cp, vdp ]
42 - enum: [ avlink, cec, infoframe, esdp, dpp, afe, rep, edid, hdmi, test, cp, vdp ]
43 - enum: [ avlink, cec, infoframe, esdp, dpp, afe, rep, edid, hdmi, test, cp, vdp ]
44 - enum: [ avlink, cec, infoframe, esdp, dpp, afe, rep, edid, hdmi, test, cp, vdp ]
45 - enum: [ avlink, cec, infoframe, esdp, dpp, afe, rep, edid, hdmi, test, cp, vdp ]
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| D | chrontel,ch7322.yaml | 7 title: Chrontel HDMI-CEC Controller
13 The Chrontel CH7322 is a discrete HDMI-CEC controller. It is
14 programmable through I2C and drives a single CEC line.
17 - $ref: /schemas/media/cec/cec-common.yaml#
60 cec@75 {
|