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/Linux-v4.19/Documentation/media/uapi/cec/
Dcec-ioc-adap-g-log-addrs.rst38 To query the current CEC logical addresses, applications call
53 values (CEC version 2.0, no vendor ID and an empty OSD name).
60 A :ref:`CEC_EVENT_STATE_CHANGE <CEC-EVENT-STATE-CHANGE>` event is sent when the
92 - The CEC version that this adapter shall use. See
95 Note that :ref:`CEC_OP_CEC_VERSION_1_3A <CEC-OP-CEC-VERSION-1-3A>` is not allowed by the CEC
104 ignored. Note that the CEC 2.0 standard allows for a maximum of 2
108 what was requested. If this field is set to 0, then the CEC
133 to :ref:`CEC_LOG_ADDR_TYPE_UNREGISTERED <CEC-LOG-ADDR-TYPE-UNREGISTERED>`).
136 - CEC 2.0 specific: the bit mask of all device types. See
137 :ref:`cec-all-dev-types-flags`. It is used in the CEC 2.0
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Dcec-ioc-g-mode.rst11 CEC_G_MODE, CEC_S_MODE - Get or set exclusive use of the CEC adapter
29 Pointer to CEC mode.
36 obtain exclusive access to the CEC adapter. This ioctl sets the
39 used to initiate messages, i.e. it commands other CEC devices. The
40 follower is the filehandle that receives messages sent to the CEC
44 When a CEC message is received, then the CEC framework will decide how
47 is waiting for it. In addition the CEC framework will process it.
49 If the message is not a reply, then the CEC framework will process it
57 The CEC framework will process core messages unless requested otherwise
59 case, the CEC framework will pass on most core messages without
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Dcec-intro.rst8 HDMI cable to communicate. The protocol for CEC version 1.4 is defined
9 in supplements 1 (CEC) and 2 (HEAC or HDMI Ethernet and Audio Return
11 extensions added to CEC version 2.0 are defined in chapter 11 of the
19 CEC, need to be handled by the kernel, others can be handled either by
22 In addition, CEC can be implemented in HDMI receivers, transmitters and
24 control just the CEC pin.
26 Drivers that support CEC will create a CEC device node (/dev/cecX) to
27 give userspace access to the CEC adapter. The
32 provides three tools to handle CEC:
34 - cec-ctl: the Swiss army knife of CEC. Allows you to configure, transmit
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Dcec-ioc-adap-g-caps.rst51 - The name of this CEC adapter. The combination ``driver`` and
55 - The capabilities of the CEC adapter, see
59 - CEC Framework API version, formatted with the ``KERNEL_VERSION()``
67 .. flat-table:: CEC Capabilities Flags
72 * .. _`CEC-CAP-PHYS-ADDR`:
81 * .. _`CEC-CAP-LOG-ADDRS`:
89 * .. _`CEC-CAP-TRANSMIT`:
93 - Userspace can transmit CEC messages by calling
97 capability isn't set, then the kernel will handle all CEC
98 transmits and process all CEC messages it receives.
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Dcec-ioc-dqevent.rst12 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
86 replied to within a second according to the CEC specification,
108 - :cspan:`1` The CEC event type, see :ref:`cec-events`.
119 - The new adapter state as sent by the :ref:`CEC_EVENT_STATE_CHANGE <CEC-EVENT-STATE-CHANGE>`
124 - The number of lost messages as sent by the :ref:`CEC_EVENT_LOST_MSGS <CEC-EVENT-LOST-MSGS>`
132 .. flat-table:: CEC Events Types
137 * .. _`CEC-EVENT-STATE-CHANGE`:
141 - Generated when the CEC Adapter's state changes. When open() is
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Dcec-pin-error-inj.rst1 CEC Pin Framework Error Injection
4 The CEC Pin Framework is a core CEC framework for CEC hardware that only
5 has low-level support for the CEC bus. Most hardware today will have
6 high-level CEC support where the hardware deals with driving the CEC bus,
8 allows you to connect the CEC pin to a GPIO on e.g. a Raspberry Pi and
9 you have now made a CEC adapter.
13 test how well CEC adapters can handle error conditions.
15 Currently only the cec-gpio driver (when the CEC line is directly
43 # <op>[,<mode>] rx-add-byte add a spurious byte to the received CEC message
44 # <op>[,<mode>] rx-remove-byte remove the last byte from the received CEC message
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Dcec-ioc-receive.rst13 CEC_RECEIVE, CEC_TRANSMIT - Receive or transmit a CEC message
37 To receive a CEC message the application has to fill in the
48 1. a message received from another CEC device (the ``sequence`` field will
53 To send a CEC message the application has to fill in the struct
59 of 2-byte messages). Note that the CEC kernel framework will also reply
75 However, the CEC specification allows sending messages from 'Unregistered' to
81 physical address, but the cable is still connected and CEC still works.
122 - A non-zero sequence number is automatically assigned by the CEC framework
123 for all transmitted messages. It is used by the CEC framework when it queues
150 to :ref:`CEC_RX_STATUS_TIMEOUT <CEC-RX-STATUS-TIMEOUT>` or
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Dcec-ioc-adap-g-phys-addr.rst33 Pointer to the CEC address.
58 A :ref:`CEC_EVENT_STATE_CHANGE <CEC-EVENT-STATE-CHANGE>` event is sent when the physical address
63 significant 4 bits represent 'a'. The CEC root device (usually the TV)
Dcec-header.rst6 CEC Header File
/Linux-v4.19/Documentation/media/kapi/
Dcec-core.rst1 CEC Kernel Support
4 The CEC framework provides a unified kernel interface for use with HDMI CEC
12 The CEC Protocol
15 The CEC protocol enables consumer electronic devices to communicate with each
22 The CEC framework described here is up to date with the CEC 2.0 specification.
30 CEC Adapter Interface
33 The struct cec_adapter represents the CEC adapter hardware. It is created by
46 adapter operations which are called by the CEC framework and that you
54 the name of the CEC adapter. Note: this name will be copied.
57 capabilities of the CEC adapter. These capabilities determine the
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/Linux-v4.19/Documentation/devicetree/bindings/media/
Dcec-gpio.txt1 * HDMI CEC GPIO driver
3 The HDMI CEC GPIO module supports CEC implementations where the CEC line
7 Please note: the maximum voltage for the CEC line is 3.63V, for the HPD and
13 - cec-gpios: gpio that the CEC line is connected to. The line should be
16 If the CEC line is associated with an HDMI receiver/transmitter, then the
21 If the CEC line is not associated with an HDMI receiver/transmitter, then
30 Example for the Raspberry Pi 3 where the CEC line is connected to
Ds5p-cec.txt1 * Samsung HDMI CEC driver
3 The HDMI CEC module is present is Samsung SoCs and its purpose is to
4 handle communication between HDMI connected devices over the CEC bus.
13 - interrupts : HDMI CEC interrupt number to the CPU.
14 - clocks : from common clock binding: handle to HDMI CEC clock.
21 - needs-hpd : if present the CEC support is only available when the HPD
Dtegra-cec.txt1 * Tegra HDMI CEC hardware
3 The HDMI CEC module is present in Tegra SoCs and its purpose is to
4 handle communication between HDMI connected devices over the CEC bus.
13 - interrupts : HDMI CEC interrupt number to the CPU.
14 - clocks : from common clock binding: handle to HDMI CEC clock.
Dmeson-ao-cec.txt1 * Amlogic Meson AO-CEC driver
3 The Amlogic Meson AO-CEC module is present is Amlogic SoCs and its purpose is
4 to handle communication between HDMI connected devices over the CEC bus.
13 - interrupts : AO-CEC interrupt number to the CPU.
14 - clocks : from common clock binding: handle to AO-CEC clock.
Dst,stm32-cec.txt1 STMicroelectronics STM32 CEC driver
7 - clocks : from common clock binding: handle to CEC clocks
9 - interrupts : CEC interrupt number to the CPU.
17 clocks = <&rcc 0 STM32F7_APB1_CLOCK(CEC)>, <&rcc 1 CLK_HDMI_CEC>;
Dstih-cec.txt1 STMicroelectronics STIH4xx HDMI CEC driver
7 - clocks : from common clock binding: handle to HDMI CEC clock
8 - interrupts : HDMI CEC interrupt number to the CPU.
10 - pinctrl-0: Specifies the pin control groups used for CEC hardware.
Dcec.txt1 Common bindings for HDMI CEC adapters
5 - needs-hpd: if present the CEC support is only available when the HPD
6 is high. Some boards only let the CEC pin through if the HPD is high,
/Linux-v4.19/drivers/media/cec/
DKconfig2 bool "HDMI CEC RC integration"
6 Pass on CEC remote control messages to the RC framework.
9 bool "Enable CEC error injection support"
12 This option enables CEC error injection using debugfs.
/Linux-v4.19/drivers/media/platform/
DKconfig534 bool "CEC platform devices"
540 tristate "ChromeOS EC CEC driver"
548 ChromeOS Embedded Controller's CEC.
549 The CEC bus is present in the HDMI connector and enables communication
553 tristate "Amlogic Meson AO CEC driver"
558 This is a driver for Amlogic Meson SoCs AO CEC interface. It uses the
559 generic CEC framework interface.
560 CEC bus is present in the HDMI connector and enables communication
563 tristate "Generic GPIO-based CEC driver"
569 This is a generic GPIO-based CEC driver.
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/Linux-v4.19/Documentation/ABI/testing/
Ddebugfs-cec-error-inj6 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:
/Linux-v4.19/drivers/media/usb/pulse8-cec/
DKconfig2 tristate "Pulse Eight HDMI CEC"
8 This is a cec driver for the Pulse Eight HDMI CEC device.
/Linux-v4.19/drivers/media/usb/rainshadow-cec/
DKconfig2 tristate "RainShadow Tech HDMI CEC"
8 This is a cec driver for the RainShadow Tech HDMI CEC device.
/Linux-v4.19/drivers/gpu/drm/bridge/adv7511/
DKconfig26 bool "ADV7511/33 HDMI CEC driver"
31 When selected the HDMI transmitter will support the CEC feature.
/Linux-v4.19/drivers/gpu/drm/vc4/
DKconfig24 bool "Broadcom VC4 HDMI CEC Support"
29 and want to use CEC.
/Linux-v4.19/drivers/media/platform/vivid/
DKconfig28 bool "Enable CEC emulation support"
33 HDMI CEC feature.

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