1What: /sys/kernel/debug/cec/*/error-inj 2Date: March 2018 3Contact: Hans Verkuil <hverkuil-cisco@xs4all.nl> 4Description: 5 6The CEC Framework allows for CEC error injection commands through 7debugfs. Drivers that support this will create an error-inj file 8through which the error injection commands can be given. 9 10The basic syntax is as follows: 11 12Leading spaces/tabs are ignored. If the next character is a '#' or the 13end of the line was reached, then the whole line is ignored. Otherwise 14a command is expected. 15 16It is up to the driver to decide what commands to implement. The only 17exception is that the command 'clear' without any arguments must be 18implemented and that it will remove all current error injection 19commands. 20 21This ensures that you can always do 'echo clear >error-inj' to clear any 22error injections without having to know the details of the driver-specific 23commands. 24 25Note that the output of 'error-inj' shall be valid as input to 'error-inj'. 26So this must work: 27 28 $ cat error-inj >einj.txt 29 $ cat einj.txt >error-inj 30 31Other than these basic rules described above this ABI is not considered 32stable and may change in the future. 33 34Drivers that implement this functionality must document the commands as 35part of the CEC documentation and must keep that documentation up to date 36when changes are made. 37 38The following CEC error injection implementations exist: 39 40- Documentation/userspace-api/media/cec/cec-pin-error-inj.rst 41