Messages in this thread | | | Date | Tue, 15 Jun 2004 22:30:53 +0200 | From | Vojtech Pavlik <> | Subject | Re: CONFIG_USB_HID vs. CONFIG_USB_HIDINPUT |
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On Tue, Jun 15, 2004 at 05:14:51PM +0000, Karel Kulhavý wrote: > On Tue, Jun 15, 2004 at 06:05:02PM +0200, Vojtech Pavlik wrote: > > On Tue, Jun 15, 2004 at 02:07:05PM +0000, Karel Kulhavý wrote: > > > Hello > > > > > > When I enable CONFIG_USB_HID and not enable CONFIG_USB_HIDINPUT in 2.4.25, will > > > I get something different from when I don't enable neither of them? > > > > > > The <Help> says basically the same about both: that they control > > > "keyboards, mice, joysticks, graphics tablets, or any other HID based devices" > > > (CONFIG_USB_HID) > > > "keyboard, mouse or joystick or any other HID input device" > > > (CONFIG_USB_HIDINPUT) > > > > > > I assume > > > 1) it doesn't matter if "keyboard" or "keyboards" is in the <Help> > > > 2) graphics tablets are assumed to be "any other HID input devices". > > > > In that case you get the HID driver, but you won't get the Input > > binding, so the devices will be detected, but won't be accessible by the > > common means (keyboard through console, mouse via /dev/input/mice, > > etc.). They still will be accessible via HIDDEV, if you enable that. > > > > Enabling HID without either HIDINPUT or HIDDEV is pointless. > > So they are 4 meaningful combinations: > 0)nothing > 1)HIDDEV > 2)HIDINPUT > 3)HIDINPUT+HIDDEV > > There are 3 tickboxes with 5 possible combinations. I suggest reducing this > count to 2 tickboxes with 4 naturally resulting combinations. I think it will > be less confusing for a user.
Actually - not. CONFIG_USB_HID enables or disables the hid.o module, and has three states - Y, N, M. The HIDINPUT/HIDDEV are just options for that module, enabling/disabling some of its functionality, having only Y and N states.
So it's quite straightforward. And there are 7 useful combinations, out of 9 possible.
And in your suggested case, you would either have to make HIDDEV/HIDINPUT tristate, resulting in illegal combinations of Y+M, or you wouldn't be able to express that the driver should be built as a module.
-- Vojtech Pavlik SuSE Labs, SuSE CR - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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