On Thu, Sep 4, 2014 at 11:57 PM, Benjamin Henrion <zoobab@xxxxxxxxx> wrote: > On Thu, Sep 4, 2014 at 7:35 PM, Wang YanQing <udknight@xxxxxxxxx> wrote: >> On Sun, Aug 31, 2014 at 11:24:56PM +0800, Wang YanQing wrote: >>> PL2303 USB Serial devices may has GPIOs, this patch add >>> basic PL2303 gpio support. >>> >>> Known issue: >>> If gpios are in use(export to userspace through sysfs interface, etc), >>> then call pl2303_release(unplug usb-serial convertor, modprobe -r, etc), >>> will cause trouble, so we need to make sure there is no gpio user before >>> call pl2303_release. >>> >>> Signed-off-by: Wang YanQing <udknight@xxxxxxxxx> >>> --- >>> Note: I sniffed office HXD gpio test program to get >>> gpios control protocol with PL2303 RA, so I only >>> test it with PL2303 RA and HXA, I don't have HXD, >>> but because it is *office* HXD gpio test program, >>> so if it doesn't work with HXD, I will feel surprise. > > I can confirm your patch is working fine on the HXD: > > http://www.zoobab.com/pl2303hxd-gpio > > I am still hunting for a simple C program to test the speed of the > GPIOs and sysfs, if you have a good reference. The exercise of the GPIO sysfs interface should be discouraged. I would put emphasis on in-kernel tests and working on a better userspace GPIO interface than the sysfs thing. Yours, Linus Walleij -- 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
