From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Rick L. Vinyard, Jr." Subject: Re: Using EV_MSC or extending KEY_* Date: Fri, 18 Sep 2009 09:40:23 -0600 Message-ID: <4d6ae6e7ee9b38f99e38d357dc755d64.squirrel@intranet.cs.nmsu.edu> References: <5d5443650909151011k4b21a6d0n28ac6142c3d7161d@mail.gmail.com> <20090915183406.GA5696@core.coreip.homeip.net> <0debc76f26fe85e28adf642396233928.squirrel@intranet.cs.nmsu.edu> <20090916034642.GC2756@core.coreip.homeip.net> <2c0ac825ebe78da99328b896faae04a2.squirrel@intranet.cs.nmsu.edu> <20090917175707.GB789@khazad-dum.debian.net> <20090918064627.GG18668@core.coreip.homeip.net> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Return-path: In-Reply-To: <20090918064627.GG18668-WlK9ik9hQGAhIp7JRqBPierSzoNAToWh@public.gmane.org> Sender: linux-usb-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Dmitry Torokhov Cc: Henrique de Moraes Holschuh , Trilok Soni , Linux USB , LKML , linux-input-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-input@vger.kernel.org Dmitry Torokhov wrote: > On Thu, Sep 17, 2009 at 02:57:07PM -0300, Henrique de Moraes Holschuh > wrote: >> On Wed, 16 Sep 2009, Rick L. Vinyard, Jr. wrote: >> > The M* keys are intended to provide a quick way to switch between key >> > mappings, with each mode having their own user-defined mappings. >> >> What I'd do in this case would be this: >> >> 1. Initially have the M* level-shift keys assigned KEY_RESERVED >> >> 2. Have a big enough keymap to map all keys in all M*-level shift states >> possible. >> >> Eg: >> START OF KEYMAP >> M* keys >> 1st set of G* keys >> 2nd set of G* keys >> 3rd set of G* keys... >> ... >> last set of G* keys >> END OF KEYMAP >> >> 3. Have the driver special-process M* level-shift keys *as long as they >> are >> still set to KEY_RESERVED* to select which part of the keymap is used to >> translate the other keys. Note that this likely means pressing a M* key >> would be transparent to userspace in this case, i.e. no events would be >> issued when a M* key is doing a level shift. >> >> So, you'd be able to set all mappings you want in the driver, and the M* >> keys would do what they're expected to do without any userland help at >> all, >> but you'd still be able to program the M* keys to be normal keys if you >> want. >> >> Of course, this assumes you don't do chording on multiple M* keys to end >> up >> with a huge number of keymaps :p >> > > Actually I think that the device should just emit KEY_PROG1..KEY_PROG4 > for the M keys and have userspace daemon load alternate keymaps on the > fly in resaponse to KEY_PROGx. The device is just a set of completely > generic buttons... User will have to tell the kernel what to map them > to. > Emitting a keycode certainly does simplify things, but that will preclude the user from programming the G-keys to KEY_PROG1..KEY_PROG4. Are there any specific use cases where a user would want to program a G-key to KEY_PROG1..KEY_PROG4? --- Rick -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html