Mac USB keyboards

[Rui Paulo]

Hi,
I'm having some troubles with the Fn key on Apple keyboards.

According to the Linux source, I need to find the hid like this:

	/*
	 * Locate the Fn key on Apple keyboards.
	 */
	[...]

		if (hid_locate(desc, size, HID_USAGE2(HUP_CUSTOM, HUC_FNKEY),
			       hid_input, &sc->sc_loc_fn, &flags)) {
			printf("%s: Fn key.\n",
			       device_get_nameunit(sc->sc_dev));
			sc->sc_flags |= UKBD_FN;
		} else
			printf("%s: Fn key not found.\n",
			       device_get_nameunit(sc->sc_dev));
	[...]

The key is found.

The problem is: during the interrupt routine, I have to read the data
on that HID location to figure out whether the Fn key is pressed or
not.

Should be something like:

	if (sc && sc->sc_flags & UKBD_FN) {
		sc->sc_fn = hid_get_data(ibuf, &sc->sc_loc_fn);
		if (sc->sc_fn)
			printf("Fn key value %d\n", sc->sc_fn);
	}

Now the fun part:
When I press Fn + key1, it doesn't print anything, but if I press Fn +
key1 + key2 (all at the same time), sc_fn value is 1.

Now the wildest part:
key1 and key2 are not random keys.
Here's a table for clarity:

  key1  |  key2
   Up      Down
  Left     Right

These keys, when Fn is pressed, should map to Page up, Page down, Home
and End.

Now the wildest-funnier part:
When I press Fn + Fkey (F1-F12) it doesn't work.
It also doesn't work for Fn + Fkey1 + Fkey2
It only works for Fn + Fkey1 + Fkey2 + Fkey3 + Fkey4

So, I'm cleary doing something plain dumb reagarding to HID functions.

Does the code I posted makes sense?

There are only two HID descriptors in this keyboard:
	HID_USAGE2(HUP_GENERIC_DESKTOP, HUG_KEYBOARD)	0x00010006
	HID_USAGE2(HUP_CUSTOM, HUC_FNKEY)		0xffff0003

Any ideas?

Thanks in advance.