Hi On Sun, Feb 23, 2014 at 7:52 AM, loody <miloody@xxxxxxxxx> wrote: > hi David: > > Thanks for your suggestion. > 2014-02-23 0:56 GMT+08:00 David Herrmann <dh.herrmann@xxxxxxxxx>: >> Hi >> >> On Sat, Feb 22, 2014 at 5:35 PM, loody <miloody@xxxxxxxxx> wrote: >>> hi all: >>> is there any kernel hid module parameter or test program can >>> temporarily not letting user mode program not receiving hid event? >>> 1. My hid kos are still inserted in. >>> 2. the kernel usb driver is working well; that mean kernel usb driver >>> still handle interrupt transaction. >>> >>> I just not want user mode program see the hid event for a while, >> >> For each connected HID device, there is a driver bound to it that >> reads the events and forwards them to HID core. What you can do, is to >> unbind a driver on a given device: >> echo "<your-device-name>" >/sys/bus/hid/drivers/<driver-name>/unbind >> The device-name is the directory name in: >> /sys/bus/hid/devices/ >> The driver name is usually "hid-generic" but can be figured out for >> each device by looking at the "driver" symlink in it's directry. >> However, this is *really* just meant for debugging. This is not >> recommended for anything serious. There is no support for that and if >> you don't know what all this does, you shouldn't use it. >> >> There is no proper way to disable a single device in the kernel. >> User-space is supposed to control device-access so we probably won't >> add such features to the kernel. If you describe your use-case in more >> details, we can try to give hints how to get that working. > > Sorry for not describing our situation clearer previously, > > The problem we met like below > a. once plug in usb hid mouse and fast moving mouse > b. the screen will get blur. > > We want to know whether the screen blur is caused by > 1. the interrupt frequency of usb mouse is too high for our embedded > system that make video decode slow > 2. something wrong between hw cursor and video overlay. > > if we can deceive user mode program there is no mouse event, but > kernel usb level still get hid interrupt transaction. > We may clarify whether above 1) conclusion is correct. > > Appreciate your kind help :-) You can unload the HID driver as described above, but that's unlikely to fix any interrupt issues. How about you compile your kernel without usbhid support? (CONFIG_USB_HID) David -- 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
