[Lcdproc] LCD2USB backlight / contrast patch

[Markus Dolze]

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Content-Type: text/plain; charset="us-ascii"
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Hi there,

I thought it would be nice to change settings for contrast and backlight through the server's option menu. And then I found the options are already there, but the driver didn't export the necessary functions. So here they are. The attached patch does:

* Add get/set functions for contrast and backlight.
* Modify the config file options handling.
* Add the OffBrigthness setting.
* Make the backlight switchable.
* Try to identify the device's firmware.
* Added some doxygen comments.

Most of the contrast / backlight stuff was copied from the CFontz driver. But I am not sure about some implementation details:

1. I put the variables for contrast, brightness and offbrightness into the HD44780 driver's private data structure. Does it belong there or better into the LCD2USB driver as (static) variables? Currently no other HD44780 driver uses them.

2. I named the new functions without HD44780 because they are assigned to functions not specific to the HD44780 drivers. 

3. What does the MODULE_EXPORT do (I didn't use it)? Does it has any effect at all or is it just there to signal a developer that this is not a private function?

Regards,
Markus

--========GMX32153119240277577419
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