Vojtech Pavlik wrote: > On Wed, Apr 30, 2008 at 04:07:06PM +0200, xerces8 wrote: >> Vojtech Pavlik wrote: >> >>> On Wed, Apr 30, 2008 at 11:28:59AM +0200, xerces8 wrote: >>>> Hi! >>>> >>>> I'm curious about some details in the protocol used by USB mice. >>>> A cursory look at the "Device Class Definition for HID 1.11" documents >>>> tells me (note this is the first USB technical document I ever read) >>>> that a mouse can tell the host the format (the protocol) used to report >>>> data (movement, button state etc.). >>>> >>>> Also a quick look into linuxv2.6.25/drivers/hid/usbhid/usbmouse.c suggests >>>> that 8 bits are used for position. >>>> >>>> So my questions are: >>>> - is the position data always 8 bits wide ? >>> No. The driver you need to look at is usbhid.ko, not usbmouse - that >>> only works for the static "HID Boot Protocol", and is only useful in >>> embedded devices. >> Pretty hard to read there... Can I activate some debug output, to see what >> my mouse is sending ? > > Yes, #define DEBUG and possibly also DEBUG_DATA will do the trick. Not true anymore on recent kernels. You need to enable CONFIG_HID_DEBUG and use the debug module parameter (/sys/module/hid/parameters/debug). -- Anssi Hannula -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
