On Thu, 26 Nov 2009, Marian wrote: > Alan Stern <stern@...> writes: > > > > > On Thu, 26 Nov 2009, Marian wrote: > > > > > Hi all! > > > > > > I have to attach the MEGAWIN USB Bridge (vid=0x0e6a, pid=0x0101) to my Linux > > > kernel. I followed the instructions in the kernel documentation and don�´t > know > > > if either the driver finally doesn�´t fit for the device or I have forgotten > to > > > configure something. > > > > What is this device? What is it supposed to do? > > > > This device is a cable that connects the Beurer heart rate watch "PM80" (which > has 3 serial Pins: RX, TX, GND) with any PC via USB. So within the cable there > is a build-in MEGAWIN MA100 controller that maps the USB data to UART and vice > versa. > > > > > This error message indicates that the device cannot be used as a serial > > interface, since it doesn't have any bulk endpoints. So usbserial > > isn't the right driver for it. Also, it runs at low speed (1.5 Mb/s) > > and doesn't have any way to send data to the computer -- the listing > > below shows that it is output only. > > Bad news, I guess...? Probably. Perhaps it indicates the device doesn't need to receive any data from the computer. Or only minimal data, that can be wrapped up in a control transfer on endpoint 0. > > > root <at> dm800:~# cat /proc/bus/usb/devices > > > > > T: Bus=02 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 3 Spd=1.5 MxCh= 0 > > > D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 > > > P: Vendor=0e6a ProdID=0101 Rev= 5.10 > > > S: Product=USB Bridge > > > C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA > > > I: If#= 0 Alt= 0 #EPs= 1 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none) > > > E: Ad=03(O) Atr=03(Int.) MxPS= 8 Ivl=10ms > > > > This doesn't tell much about what the device is intended for. It uses > > a vendor-specific communications protocol, so Linux might not have any > > drivers for it. > > Where is the clue that it uses a vendor-specific protocol? I am not very > familiar with the USB-Subsystem yet... On the I: line, it says "Cls=ff(vend.)". The "vend." is short for "vendor-specific". > I think I will run windows on a VM and try to snoop the usb data produced by the > given Windows driver, like Greg Kroah-Hartman introduces here: > http://www.linuxjournal.com/article/7582 > Maybe then I can reverse-engineer the windows driver. That's a good idea. Alan Stern -- 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
