Hello, while working on my roccat device drivers I thought about the possiblity of on the fly polling rate changes and tested some things. First I tried different polling rates by writing values from 1 to 10 into /sys/bus/usb/drivers/usbhid/module/parameters/mousepoll. I observed that the polling rates seem to be capped on both sides. With value 1 I measure 2ms instead of 1ms with my hardware protocol analyzer. With 10 I get 8ms instead of 10ms. I only use cheap onboard usb controllers, but under windows they work with 1ms. A internet and code search revealed nothing regarding this to me. Is someone of you aware of this behaviour and could tell me more about it? Changing the polling rate of a device on the fly would requires to use usb_kill_urb() and usb_submit_urb() with new interval. To get the int_urb I would need additional informations for incomplete struct usbhid_device that lie in drivers/hid/usbhid/usbhid.h. My driver code is at home in drivers/hid/. Is it okay to include a header further down in the structure? Or does anyone have concerns about moving the mentioned header to include/linux? Is this a matter to follow at all? Thanks in advance Stefan -- 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
