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Diffstat (limited to 'Documentation/media/v4l-drivers/v4l-with-ir.rst')
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diff --git a/Documentation/media/v4l-drivers/v4l-with-ir.rst b/Documentation/media/v4l-drivers/v4l-with-ir.rst new file mode 100644 index 000000000000..0da47a847056 --- /dev/null +++ b/Documentation/media/v4l-drivers/v4l-with-ir.rst @@ -0,0 +1,72 @@ + +infrared remote control support in video4linux drivers +====================================================== + + +basics +------ + +Current versions use the linux input layer to support infrared +remote controls. I suggest to download my input layer tools +from http://bytesex.org/snapshot/input-<date>.tar.gz + +Modules you have to load: + + saa7134 statically built in, i.e. just the driver :) + bttv ir-kbd-gpio or ir-kbd-i2c depending on your + card. + +ir-kbd-gpio and ir-kbd-i2c don't support all cards lirc supports +(yet), mainly for the reason that the code of lirc_i2c and lirc_gpio +was very confusing and I decided to basically start over from scratch. +Feel free to contact me in case of trouble. Note that the ir-kbd-* +modules work on 2.6.x kernels only through ... + + +how it works +------------ + +The modules register the remote as keyboard within the linux input +layer, i.e. you'll see the keys of the remote as normal key strokes +(if CONFIG_INPUT_KEYBOARD is enabled). + +Using the event devices (CONFIG_INPUT_EVDEV) it is possible for +applications to access the remote via /dev/input/event<n> devices. +You might have to create the special files using "/sbin/MAKEDEV +input". The input layer tools mentioned above use the event device. + +The input layer tools are nice for trouble shooting, i.e. to check +whenever the input device is really present, which of the devices it +is, check whenever pressing keys on the remote actually generates +events and the like. You can also use the kbd utility to change the +keymaps (2.6.x kernels only through). + + +using with lircd +================ + +The cvs version of the lircd daemon supports reading events from the +linux input layer (via event device). The input layer tools tarball +comes with a lircd config file. + + +using without lircd +=================== + +XFree86 likely can be configured to recognise the remote keys. Once I +simply tried to configure one of the multimedia keyboards as input +device, which had the effect that XFree86 recognised some of the keys +of my remote control and passed volume up/down key presses as +XF86AudioRaiseVolume and XF86AudioLowerVolume key events to the X11 +clients. + +It likely is possible to make that fly with a nice xkb config file, +I know next to nothing about that through. + + +Have fun, + + Gerd + +-- +Gerd Knorr <kraxel@bytesex.org> |