pl2303 revisited

Hi guys;

I am using one of these as the interface between belkins upsd daemon and the 
ups,  This particular one says its a radio shack model according to lsusb -v:
======
Bus 002 Device 003: ID 1453:4026 Radio Shack 26-183 Serial Cable
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0         8
  idVendor           0x1453 Radio Shack
  idProduct          0x4026 26-183 Serial Cable
  bcdDevice            0.00
  iManufacturer           0
  iProduct                0
  iSerial                 0
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           39
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0x80
    MaxPower              500mA
    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
======,  several years old now, and the cat of /proc/bus/usb/devices for it 
looks like this:

T:  Bus=02 Lev=02 Prnt=02 Port=00 Cnt=01 Dev#=  3 Spd=12  MxCh= 0
D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=1453 ProdID=4026 Rev= 0.00
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=500mA
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

And no, that's not a paste error, it really does have 3 E:'s.

dmesg says this about it.
pl2303 2-2.1:1.0: pl2303 converter detected
usb 2-2.1: pl2303 converter now attached to ttyUSB0
usbcore: registered new interface driver pl2303
drivers/usb/serial/pl2303.c: Prolific PL2303 USB to serial adaptor driver
drivers/usb/serial/usb-serial.c: USB Serial support registered for FTDI USB 
Serial Device

When it is being used to monitor the ups, it will fail to get the data 
properly, 2 or 3 times a day, and the belkin upsd has this nasty habit of 
throwing up a small screen on every screen running, or popping up its message 
on all available shells with a -wall broadcast advising the whole world of 
the disconnect, only to cancel it 2 seconds later when it starts getting good 
data again.  A right noxious PITA.  And it can only talk to a full, 12mb/s 
usb circuit, it is not even detected or initialized if its plugged into a 
high speed (400mhz) hub.

The problem has the walk and quack of a type 2 pl2303 that I was able to find 
a thread on that took place back in 2005, thanks to google.

Is this indeed a type 2 chip?  Or enough of a clone of it to stumble like this 
from time to time?

Are there any patches to fix this even pending at this late date?  I could 
play the canary easy enough and test them.


Thanks all.

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
The greatest remedy for anger is delay.

-------------------------------------------------------------------------
This SF.net email is sponsored by DB2 Express
Download DB2 Express C - the FREE version of DB2 express and take
control of your XML. No limits. Just data. Click to get it now.
http://sourceforge.net/powerbar/db2/
_______________________________________________
[email protected]
To unsubscribe, use the last form field at:
https://lists.sourceforge.net/lists/listinfo/linux-usb-devel