Date: Sat, 13 Sep 2014 21:04:18 +0900 From: "Lundberg, Johannes" <johannes@brilliantservice.co.jp> To: "freebsd-usb@freebsd.org" <freebsd-usb@freebsd.org> Subject: libusb and non-root access problem Message-ID: <CAASDrVn4eQXG7z11OE3ydyZGMaq-9rjCZqyv655SkZ%2BgKffeUg@mail.gmail.com>
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I have a special usb device > to which I connect with libusb. Everything works find as root but I can > seem to be able to access with normal user no matter how I configure devfs. > > I changed both conf and rules and even set myself as owner and group and > 777 permission to /dev/ugen* /dev/usb and /dev/usb/* but no luck... > > I can connect to the device and claim interface but then it fails at the > first libusb_control_transfer with error -4 > > I have done this before without problems. I am running the newest > 11-CURRENT snapshot so could there be any bug that causes this or has > anything changed in configurations? > > Grateful for any advice... > -- > Johannes Lundberg > Hi, You only need to "chmod /dev/usb/X.Y.0" . Some control transfers are always restricted to root user: /* * Avoid requests that would damage the bus integrity: */ if (((req->bmRequestType == UT_WRITE_DEVICE) && (req->bRequest == UR_SET_ADDRESS)) || ((req->bmRequestType == UT_WRITE_DEVICE) && (req->bRequest == UR_SET_CONFIG)) || ((req->bmRequestType == UT_WRITE_INTERFACE) && (req->bRequest == UR_SET_INTERFACE))) { /* * These requests can be useful for testing USB drivers. */ error = priv_check(curthread, PRIV_DRIVER); if (error) { return (error); } } You need to use their libusb counterpart to avoid problems! --HPS
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