Dmitry Torokhov wrote: > On Tue, Sep 15, 2009 at 01:05:57PM -0600, Rick L. Vinyard, Jr. wrote: >> Dmitry Torokhov wrote: >> > On Tue, Sep 15, 2009 at 10:41:30PM +0530, Trilok Soni wrote: >> >> Adding linux-input. >> >> >> >> On Tue, Sep 15, 2009 at 9:49 PM, Rick L. Vinyard, Jr. >> >> <rvinyard@xxxxxxxxxxx> wrote: >> >> > On the Logitech G13 there are a set of 10 special keys at the top >> of >> >> the >> >> > device. >> >> > >> >> > I've written the driver so that it maintains a map from the general >> >> keys >> >> > (G1-G22) to Linux' input subsystem keys. >> >> > >> >> > The map can be changed on the fly, allowing multiple keymaps to be >> >> loaded. >> >> > >> >> > As a side note I haven't provided for this functionality (multiple >> >> > keymaps) in the driver since this can be maintained from userspace, >> >> but it >> >> > does need to know about the currently loaded keymap so that when >> the >> >> raw >> >> > HID events are parsed the appropriate EV_KEY events can be input. >> >> > >> >> > I could set it up so that the special keys also map to a KEY_* >> code. >> >> > However, I'd prefer to set things up so that any G1-G22 key can be >> >> mapped >> >> > to any input subsystem KEY_* code and not reserve a set of 10 from >> the >> >> > current KEY_* codes for the 10 special keys. >> >> > >> >> > One way I was thinking of approaching this was to generate EV_MSC >> type >> >> > events (with a MSC_RAW code) using the value to indicate the state >> >> > (pressed/released) and special key. >> > >> > Doesn't HID already generate EV_MSC/MSC_SCAN for exactly this purpose >> > so userspace knows what keys can be remapped? You may initially map >> all >> > keys you don't know the usage to KEY_UNKNOWN. >> >> As I understand it the EV_MSC/MSC_SCAN is used to trigger a prompting of >> the user to map a key, which would be useful for the G1-G22 keys and >> perhaps 5 of the 10 special keys. But, that's not the behavior I want >> for >> the M1, M2, M3, MR and backlight keys. >> >> Somehow they need to be distinct from any existing KEY_* codes or not >> have >> a code at all... i.e. only emitting the raw misc events. >> >> Perhaps the BTN_MISC codes are better suited for these keys? >> > > I am sorry, I don't follow... why would yo not want to assign a standard > code to the M* keys? > > -- > Dmitry The M* keys are intended to provide a quick way to switch between key mappings, with each mode having their own user-defined mappings. So, if it is intended for the user to potentially program any of the G* keys to anything within the set of existing keys (KEY_*, BTN_*) then the M* keys need something outside that set to signal their events. That's why I was thinking that EV_MSC/MSC_RAW could encode both the key and the state (Pressed/Released) outside the set of existing keys. --- Rick -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
