Hello there,
I'm not a kernel coder myself, but I think there may be a problem
with the pl2303 driver.
I have a gateway 400VTX laptop that doesn't have a serial port, so I
bought a ATEN UC-232 -based serial->usb converter to make my GPS work.
First, setserial doesn't work:
#setserial /dev/usb/ttyUSB0
Cannot get serial info: Invalid argument
but even worse, it crashes my system...
setserial -a /dev/usb/ttyUSB0
(The above command puts my little system to never-ending sleep,
making 2 of the LED lights blink.)
I was using a program called gpsd(comes with gpsdrive)
The first time I run gpsdrive, it seems that all is fine and I'm able
to get gps data. after I exit gpsdrive and run it again, it still
works fine, but when I exit the 2nd time, my system goes to sleep
again in the same way. (with the same 2 lights blinking)
I had both usbserial and pl2303 loaded with debug=1 and here's what
the 1st run produced: (Don't know why the lines are truncated in
the beginning)
Jan 14 07:33:12 localhost kernel: <serial.c: generic_chars_in_buffer - returns 0
Jan 14 07:33:13 localhost kernel: <_callback - port 0
Jan 14 07:33:25 localhost kernel: <ta = 32
Jan 14 07:33:34 localhost kernel: <7_callback - port 0
Jan 14 07:33:40 localhost kernel: <a = 2c
Jan 14 07:33:47 localhost kernel: <_callback - port 0
Jan 14 07:35:34 localhost kernel: <a = 38
Then, when I run it the 2nd time, here's what the logs gave me:
Jan 14 07:35:38 localhost kernel: <serial.c: generic_chars_in_buffer - returns 0
Jan 14 07:35:49 localhost kernel: <a = 4c
Jan 14 07:35:55 localhost kernel: <_read_bulk_callback - length = 1, data = 2e
Jan 14 07:36:13 localhost kernel: <_read_bulk_callback - length = 1, data = 50
Jan 14 07:36:24 localhost kernel: <in_buffer = port 0
Jan 14 07:36:26 localhost kernel: <turns 0 * After this it froze
The only thing different between the 2 runs is that there seems to be
still data left in the buffer the 2nd time...
...<_read_bulk_callback - length = 1, data = 2e
...<_read_bulk_callback - length = 1, data = 50
In fact, I think this is the only debug message produced by the pl2303
driver. When I repeated this with only the pl2303 driver being debug=1,
the only syslog entry I received was during the 2nd run:
Jan 14 08:02:25 localhost kernel: llback - length = 1, data = 50
Do you think there's hope for me? What should I do?
I'm using Redhat 2.4.20-28.9
Do you know if Belkin drivers are any better? Which serial usb
converters have the best support on Linux?
Ovanes
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