Prolific PL-2303X

[mkosmo]

I am not sure which is a more appropriate forum to place this in, so I am crossposting it here as well as in Laptops/Hardware. If the moderators do not like me posting this here as well, they can delete it... I just really would like some help if somebody knows how to fix my problem.

Thanks.

I am running Ubuntu Edgy on a Dell E1705. I have been banging my head on this for a week now, and have finally thrown in the towel and ego to post on the forum. ](*,)
So, heres my problem. I got an Airlink101 AC-USBS, which uses a Prolific PL-2303X chip. I have this connected to a Sun Ultra 2. I set up minicom at 9800-8-N-1. I even ran minicom as root to prevent permissions from being the issue. No traffic seems to be passed. I know this machine has worked before, since I used minicom with the same settings on my other machine (which had a serial port) when it was here. Here is a bunch of diagnostics... any ideas?

One thing I notice, is I think its loading the driver for the PL-2303 and not the PL-2303X. Could this be the problem? If so, how do I fix it?

Thanks a bunch!


kosmo@blade:~$ dmesg
...
[17282362.036000] usb 3-1: new full speed USB device using uhci_hcd and address 5
[17282362.196000] usb 3-1: configuration #1 chosen from 1 choice
[17282362.196000] pl2303 3-1:1.0: pl2303 converter detected
[17282362.196000] usb 3-1: pl2303 converter now attached to ttyUSB0

kosmo@blade:~$ lsusb
Bus 004 Device 001: ID 0000:0000
Bus 005 Device 001: ID 0000:0000
Bus 003 Device 005: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 003 Device 001: ID 0000:0000
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 002: ID 413c:a005 Dell Computer Corp.
Bus 001 Device 001: ID 0000:0000


kosmo@blade:~$ lsusb -v -d 067b:2303

Bus 003 Device 005: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x067b Prolific Technology, Inc.
idProduct 0x2303 PL2303 Serial Port
bcdDevice 3.00
iManufacturer 1 Prolific Technology Inc.
iProduct 2 USB-Serial Controller
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 39
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x000a 1x 10 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Device Status: 0x0000
(Bus Powered)

kosmo@blade:~$ cat /proc/bus/usb/devices
...
T: Bus=03 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 5 Spd=12 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=067b ProdID=2303 Rev= 3.00
S: Manufacturer=Prolific Technology Inc.
S: Product=USB-Serial Controller
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=pl2303
E: Ad=81(I) Atr=03(Int.) MxPS= 10 Ivl=1ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms
E: Ad=83(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms
...

[ubmac]

Hi,
I installed ubuntu to use a tool not included in windows, and linux is much better the last time I installed linux.
I'm trying to work with a PL-2303X serial adaptar too, and came to this thread.
Found this link http://koti.mbnet.fi/lonnberg/pl2303x.html ,
but my problem was not to link to /dev/ttyS0 with the command ln -b /dev/ttyUSB0 /dev/ttyS0 :D The following patch modifies the driver for the Prolific PL-2303 USB-serial adapter to add support for the highly similar but incompatible PL-2303X adapter. The PL-2303X has the same vendor ID and product ID as the older PL-2303, which means that it will be incorrectly detected as a PL-2303 by the driver currently in the Linux kernel. Attempting to use a PL-2303X as a PL-2303 simply results in an inability to transfer data through the serial port. In other words, nothing happens. This patch autodetects whether a PL-2303 or a PL-2303X is used and changes the initialisation sequence accordingly.

The PL-2303X can be distinguished from a PL-2303 by checking bMaxPacketSize0 for the device using lsusb -v -d 067b:2303 (as root). If bMaxPacketSize0 is 64, you probably have a PL-2303X and need this patch.The main kernel tree includes PL-2303X support starting from 2.6.8 (I can confirm that PL-2303X works on 2.6.11rc2 without my patch), making this patch unnecessary.

Happy new year.