Hello, This is a question in general about usb drivers and in particular about easycap driver.
Is there any way a driver can be accesed between after usb_probe() but before device open()? I guess not, since any further operation on the device needs a struct file pointer, i.e. a file descriptor on the user side. In particular: easycap driver currently calls reset() on usb_probe(), reset() does some hardware initialization among other stuff. However, the reset() is called once again on open(). This seems redundant, right? The reset() is a heavy function since it access the hardware, so it would be benefitial to change it, but I would like someone to ack this, since it is not so trivial. Some measures on the device shows how heavy the reset() is: # calling reset() on usb_probe() time modprobe easycap real 0m1.516s user 0m0.000s sys 0m0.009s --- # not calling reset() on usb_probe() time modprobe easycap real 0m0.003s user 0m0.000s sys 0m0.002s Thanks, Ezequiel. _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
