Date: Thu, 30 Apr 2009 14:44:31 +0200 From: Hans Petter Selasky <hselasky@c2i.net> To: Milan Obuch <freebsd-usb@dino.sk> Cc: freebsd-usb@freebsd.org Subject: Re: u3g serial device name query Message-ID: <200904301444.32024.hselasky@c2i.net> In-Reply-To: <200904301412.38313.freebsd-usb@dino.sk> References: <200904301221.44674.freebsd-usb@dino.sk> <200904301258.37784.hselasky@c2i.net> <200904301412.38313.freebsd-usb@dino.sk>
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On Thursday 30 April 2009, Milan Obuch wrote: > On Thursday 30 April 2009 12:58:36 Hans Petter Selasky wrote: > > On Thursday 30 April 2009, Milan Obuch wrote: > > > Hi, > > > > > > I have HUAWEI 3g usb modem. It works with u3g from current. There is > > > however one thing I did not get working yet. > > > > > > When device attaches, it is added into tree as u3gN, devd event is > > > sent. It is easily matched with 'device-name "u3g[0-9]"' clause in > > > devd.conf. I can start ppp automatically and it works well, given no > > > other USB serial device is present. > > > > > > If another USB serial device such as uplcom is present, u3g serial > > > ports does not have the same name. I found no way to relate serial > > > device name to this event and looking in source I see no place where it > > > is created. I would like to put a devctl notify call there. This way I > > > could start ppp with correct device name even if there is some other > > > USB serial device. > > > > > > Could someone point me in the right direction? > > > > USB serial devices have their own unit management. There is however a way > > to override the unit number through the "usb2_com_tty_name" callback, > > which requires some code changes to the u3g driver. > > > > All USB modems and serial adapters end up with the same naming > > prefix: /dev/cuaU%d.%d, so the assigned numbers must be serialised. > > > > What we could do is to have a separate naming prefix for 3G modems, and > > use the device_get_unit() for unit number. > > > > See: src/sys/dev/usb/serial and usb_serial.c > > I looked over usb2_com_attach_tty function in usb_serial.c, and somewhere > after call to tty_makedev (where a DPRINT is too) I could put a devctl > call. > > All I need for it would be device name. In /var/log/message file I see a > line telling 'u3g0 : Found 2 ports' just after usb2_com_attach_tty function > is called. If you could tell me how I can get 'u3g0' name via sc argument > in usb2_com_attach_tty function, I can solve this with no other change. > You have to cast the parent softc pointer back into "struct u3g_softc", which is stored in the ucom softc. In the u3g_softc you should find sc_dev, which you can use "device_get_nameunit()" on. You can do this in the "usb2_com_tty_name" callback function. --HPS
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