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On Wed, 6 Nov 2002 17:51, Pete Zaitcev wrote:
> This is wonderful, however I am concerned that hiddev cannot be
> used while input is using hid. This seems a little too limiting.
> How am I supposed to implement the applet to indicate the battery
> charge, for example? Adding Logitech-specific control messages
> to mousedev does not look appealing.
At one stage hiddev claimed every device. I am not sure when Vojtech changed
this behaviour. I know that some protocols require a sequence of control
commands, and it is bad karma if you get them mixed up (eg if you want to
change the resolution on Logitech dual optical devices, you have to send a
couple of commands. The device may not want you to try anything between
them)>
I'm seeing three options:
1. Change the HID driver to always associated interfaces with hiddev, even if
also associated with hid-input. Probably needs some locking.
2. Don't used hiddev, just use usbfs control messages directly from userspace,
and hope that you don't cock up something that hid-input is doing.
3. Add some additional code through the whole input subsystem.
I'm thinking that option 1 is the best. It'll be trivial to associate every
hid interface with hiddev - there is code that looks like:
for (i = 0; i < hid->maxcollection; i++)
if (hid->collection[i].type ==
HID_COLLECTION_APPLICATION &&
!IS_INPUT_APPLICATION(hid->collection[i].usage))
break;
in hiddev::hiddev_connect(). If you remove this test, then it should claim
every device (except those blacklisted). The need for explicit locking should
be explored further.
There is a cost to this: more minor numbers required for hiddev.
Greg, Vojtech - any comments?
- --
http://linux.conf.au. 22-25Jan2003. Perth, Aust. I'm registered. Are you?
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