On Sat, Apr 21, 2007 at 09:07:51PM -0400, Gene Heskett wrote:
> 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.
That's odd, is the data really there? You can enable debugging in the
pl2303 driver with:
modprobe pl2303 debug=1
or writing 1 to /sys/modules/pl2303/parameters/debug
That will probably give you way more information in your syslog than you
ever wanted, but would point to if the device was ever really seen by
the Linux side at all.
> 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.
I don't have any pl2303 patches pending, it should "just work". Oh make
sure you have the flow control set up properly, you have done that,
right?
thanks,
greg k-h
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