Function called for sending an IR code, residing in the second argument. Much IR hardware was not designed as general-purpose IR hardware, but to allow e. A complete driver package consists of three files: At the time of writing, there are about 44 plugins and 54 drivers. In the configuration file, this can be determined by the lines one 0 0 and one 0 0 , which is clearly not usable without the context, namely the hardware used for capturing. The only thing visible from outside is a particular data structure, containing some data elements, and some pointers to functions, that in these way effectively are made public API. This is a non-blocking function which returns NULL if there is no data available currently, but might very well succeed later.
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This function simple opens the device. Hard close of the device.
Much IR hardware was jserspace designed as general-purpose IR hardware, but to allow e. Function called for sending an IR code, residing in the second argument.
This hardware in general decodes the IR signal in its own hardware, and delivers, for recognized signals, an integer code denoting the code received like “play”. The struct driver is the data structure representing the driver for LIRC.
At the time of writing, there are about 44 plugins and 54 drivers. Since the plugin code is called only indirectly through the hardware struct, no extern “C” declarations are required in userpsace plugin code. The autotools are not needed, in particular not libtool.
lircd(8) — lirc — Debian testing — Debian Manpages
There are a number of “features” that a driver can have or not have. A user space driver is a C file where all the functions are declared statici. The driver is loaded, used and unloaded by the executing program according to the following:. A complete driver package consists of three files: To compile in-tree and assuming autogen.
When running using the effective-user option, this function is called running as root – other functions are called running as the effective-user optionn. New files are automatically picked up. This is used by tools like lirc-setup, but also to create the list of all drivers.
This is usespace generic way to set a named key to value which should cover many most?
It ilrc possible to generate console output in any way; writing on stdout or stderrusing lircc. A simple generic Makefile is provided in the Appendix, another example is available in the sources as ref Makefile. Except for the timeout argument to readdatathere does not appear to be any timing issues the driver author needs to address. For signals not following the protocol, no output is generated.
Zero return value indicates failure, all other return values success. The device might get closed as part of error handling, so calling code should be prepared to reopen device if required. The actual numbers vary depending on configuration i. In userspacd way a certain encapsulation is achieved. User space drivers are nothing else but normal compiled C functions, running as the invoking user which may or may not be root.
These are documented in the lirc 4 manpage which has been upstreamed from the LIRC project. Also note that some function pointer may be NULL, indicating that the driver does not implement the said functionality e. Therefore, the decomposition between “program” and driver is a priori not always necessary, but instead serves modularization and structuring. Some standard error codes are defined in driver. It should return nonzero in uerspace case of success. A full-fledged IR driver, on reading, can deliver the timing of these period “durations”.
Documentation of the LIRC driver API version 2.
Kernel liec will not be covered in the present article. Note that a driver sometimes “misuses” a field; e. Plugins can also easily be built out-of tree. We disregard modulation for the time being.