06-25-2009
So, as it turns out, the TTY and serial layers were fine.
The actual problem I'm having is with the schedule_delayed_work call.
The function tty_flip_buffer_push in drivers/char/tty_buffer.c calls flush_to_ldisc, which pushes the data to user space, if the tty->low_latency flag is set. Otherwise, it will push onto the scheduler with schedule_delayed_work. The problem here is that this delayed work is never revisited. Thus, my character input was never sent through to user space because the scheduler never called the process to do it again.
For the time being, I have hard coded it to always call flush_to_ldisc instead of the schedule_delayed_work, but this is not a fix, this is a workaround. Does anyone have any suggestions as to why this scheduling call wouldn't behave correctly?
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UMCS(4) BSD Kernel Interfaces Manual UMCS(4)
NAME
umcs -- USB support for serial adapters based on the MCS7820 and MCS7840 chips
SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file:
device usb
device ucom
device umcs
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
umcs_load="YES"
DESCRIPTION
The umcs driver provides support for various multiport serial adapters based on the MosCom MCS7820 and MCS7840 chips. They are 2- or 4-port
adapters with full-featured 16550-compatible UARTs and very flexible baud generators. Also, these chips support RS422/RS485 and IrDA opera-
tions.
The device is accessed through the ucom(4) driver which makes it behave like a tty(4).
Different ports on device are presented as sub-units, like /dev/ttyU0.1 and /dev/ttyU0.2.
HARDWARE
The umcs driver was tested on the following adapters:
o ST Lab U-360 two-port serial USB adapter
o ST Lab U-400 four-port serial USB adapter
SEE ALSO
tty(4), ucom(4), usb(4)
HISTORY
The umcs driver appeared in ports since December of 2010.
AUTHORS
The umcs driver was written by Lev Serebryakov <lev@FreeBSD.org>.
BUGS
This driver doesn't support access to any fine tunes of chip, like RS522/RS485 mode, non-standard baudrates, etc.
BSD
February 25, 2012 BSD