Daniel Laird schrieb:
> I have written a linux input driver for a front panel.
> We have mapped the front panel keys to BTN_0 -> BTN_9
>
> When DirectFB linux_input module is used the get_device_info function does
> not seem to recognise these buttons.
> I looked into this function and there is this section:
> if (test_bit( EV_KEY, evbit )) {
> int i;
>
> /* get keyboard bits */
> ioctl( fd, EVIOCGBIT(EV_KEY, KEY_MAX), keybit );
>
> /** count typical keyboard keys only */
> for (i=KEY_Q; i<KEY_M; i++)
> if (test_bit( i, keybit ))
> num_keys++;
>
> for (i=KEY_OK; i<KEY_MAX; i++)
> if (test_bit( i, keybit ))
> num_ext_keys++;
>
> for (i=BTN_MOUSE; i<BTN_JOYSTICK; i++)
> if (test_bit( i, keybit ))
> num_buttons++;
> }
>
> The code obviously does not look for the complete range of BTN
> events(input.h in linux kernel). If I change the last section to read
> for (i=BTN_MISC; i<BTN_GEAR_UP; i++)
> if (test_bit( i, keybit ))
> num_buttons++;
>
> Then the complete rane of buttons are recognised.
>
> Am I doing the correct thing? It there any reason why this could not be
> patched for DFB-1.0. If not i will submit a patch
It's not that easy. The event translation uses the BTN_MOUSE offset
to have the mouse buttons start at 0 = DIBI_LEFT. Up to 32 buttons
are supported. With this change the event translation would still
work for normal mice, but for your panel negative values will appear.
Making the event translation use BTN_MISC as the offset would break
DIBI_LEFT etc. for normal mice. The full button range is 82 buttons
which would also break :)
A way to fix it might be to detect in which of the button group
the device operates, i.e. BTN_MOUSE, BTN_JOYSTICK, BTN_GAMEPAD,
BTN_DIGI and BTN_WHEEL. Using that as the offset in translation.
Not sure about devices operating in more than one group.
--
Best regards,
Denis Oliver Kropp
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