How to configure the tty with a usb serial device

[scott <scott@waye.co.uk>]

Hello,

Is hotplug the right place to set up (e.g. stty ispeed 4800) a USB 
serial device?  I can see that after udev runs and creates the 
/dev/tts/USB0, the only call left to hotplug is with a type of tty.  But 
I have no tty.agent (of course I can cp usb.agent tty.agent which I've 
done), but what would be the equivalent of usbmodules?  Also how can 
hotplug "know" the /dev/tts/USBx device that was created by the udev 
rule, there doesn't seem to be any environment variable for that?

kernel 2.6.15.4

Here is a section of debug:

Nov 26 20:34:32 calera default.hotplug[7676]: no runnable 
/etc/hotplug/usb-serial.agent is installed
Nov 26 20:34:32 calera kernel: drivers/usb/serial/usb-serial.c: USB 
Serial support registered for pl2303
Nov 26 20:34:32 calera kernel: pl2303 1-1:1.0: pl2303 converter detected
Nov 26 20:34:32 calera kernel: usb 1-1: pl2303 converter now attached to 
ttyUSB0
Nov 26 20:34:32 calera kernel: usbcore: registered new driver pl2303
Nov 26 20:34:32 calera kernel: drivers/usb/serial/pl2303.c: Prolific 
PL2303 USB to serial adaptor driver
Nov 26 20:34:32 calera default.hotplug[7689]: testing debug
Nov 26 20:34:32 calera udev[7695]: udev_rules.c: rule applied, 'ttyUSB0' 
becomes 'tts/USB0'
Nov 26 20:34:32 calera udev[7695]: udev_add.c: creating device node 
'/dev/tts/USB0'
Nov 26 20:34:32 calera default.hotplug[7689]: arguments (tty) env 
(PHYSDEVPATH=/devices/pci0000:00/0000:00:10.0/usb1/1-1/1-1:1.0/ttyUSB0
SUBSYSTEM=tty OLDPWD=/ DEVPATH=/class/tty/ttyUSB0 MINOR=0 
PATH=/bin:/sbin:/usr/sbin:/usr/bin ACTION­d PWD=/etc/hotplug MAJOR\x188 
HOME=/
 SHLVL=2 PHYSDEVDRIVER=pl2303 DEBUG=yes PHYSDEVBUS=usb-serial SEQNUMf1 
_=/usr/bin/env)
Nov 26 20:34:32 calera default.hotplug[7689]: invoke 
/etc/hotplug/tty.agent ()
Nov 26 20:34:32 calera tty.agent[7689]: testing debug
Nov 26 20:34:32 calera tty.agent[7689]: load_drivers for tty and module
Nov 26 20:34:32 calera tty.agent[7689]: lister is /sbin/ttymodules
Nov 26 20:34:32 calera tty.agent[7689]: mapfile is /etc/hotplug/usb.usermap
Nov 26 20:34:32 calera tty.agent[7689]: device is
Nov 26 20:34:32 calera tty.agent[7689]: drivers is
Nov 26 20:34:32 calera tty.agent[7689]: ... no modules for USB product


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