On Wednesday 28 April 2010 07:53:30 Greg KH wrote:
> On Sat, Apr 24, 2010 at 10:39:58AM +0200, Andrea Cometa wrote:
> > Greg KH ha scritto:
> >> [...]
> >>
> >>> The same thing happens with different brands of Prolific devices!
> >>
> >> This is sounding like a hardware problem on the device you have plugged
> >> into the usb-serial device. Are you sure that works?
> >>
> >>> I have now ordered a FTDI device to see if anything changes! (hope)
> >>
> >> I hope so too :)
> >>
> >> thanks,
> >>
> >> greg k-h
> >
> > now this is the actual situation:
> >
> > i've 4 different kind of usb-serial devices, 3 PL2303X (different brands)
> > and 1 FTDI
> > (ubuntu 8.04) with kernel 2.6.24 works with all 4 devices
> > (ubuntu 9.10) with kernel 2.6.31, 2.6.32, 2.6.34 works only with ftdi
> >
> > I think there is a bug on recognizing the PL2303X device,
> > to solve the problem, I would be happy to give you more details if
> > necessary
>
> Yes, I don't know what is currently going on with this device, sorry.
drivers/usb/serial/pl2303.c
Can someone shed some light into where the following device detection logic is
derived from?
if (serial->dev->descriptor.bDeviceClass == 0x02)
type = type_0;
else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
type = HX;
else if (serial->dev->descriptor.bDeviceClass == 0x00)
type = type_1;
else if (serial->dev->descriptor.bDeviceClass == 0xFF)
type = type_1;
dbg("device type: %d", type);
I have a PL2303 device which is detected like HX type instead of type_0:
bLength = 0x0012
bDescriptorType = 0x0001
bcdUSB = 0x0110
bDeviceClass = 0x0000
bDeviceSubClass = 0x0000
bDeviceProtocol = 0x0000
bMaxPacketSize0 = 0x0040
idVendor = 0x067b
idProduct = 0x2303
bcdDevice = 0x0300
iManufacturer = 0x0001 <retrieving string failed>
iProduct = 0x0002 <USB 2.0 To COM Device>
iSerialNumber = 0x0000 <no string>
bNumConfigurations = 0x0001
--HPS
--
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
