"device_free_softc()" and "device_claim_softc()",
to allow USB serial drivers refcounting the softc.
These functions are used to grab the softc from
auto-free and to free the softc back to the correct
malloc type, respectivly.
Discussed with: jhb
MFC after: 2 weeks
Extend the callback table of UCOM to include a
"ucom_free" function pointer which is called when
all refs on a UCOM super structure is gone.
Implement various helper functions to handle
refcounting and draining on the UCOM super
structure.
Implement macro which can be used in device
drivers to avoid module unload before all
pending TTY references are gone.
The UCOM API is backwards compatible after this
change and device drivers require no changes
to function with this change. Only a recompilation
of UCOM device drivers is required. The FreeBSD
version has been bumped in that regard.
Discussed with: kib, ed
MFC after: 2 weeks
At the moment grab and ungrab methods of all console drivers are no-ops.
Current intended meaning of the calls is that the kernel takes control of
console input. In the future the semantics may be extended to mean that
the calling thread takes full ownership of the console (e.g. console
output from other threads could be suspended).
Inspired by: bde
MFC after: 2 months
The SYSCTL_NODE macro defines a list that stores all child-elements of
that node. If there's no SYSCTL_DECL macro anywhere else, there's no
reason why it shouldn't be static.
Check for this case and just return, so that the UCOM unit number zero is
not accidentially freed.
Submitted by: Danish FreeBSD user at EuroBSDcon 2011
MFC after: 3 days
information through devd. My E220 now produces the notification (1 line):
+u3g0 at bus=1 hubaddr=1 port=0 devaddr=2 interface=0 \
vendor=0x12d1 product=0x1003 devclass=0x00 devsubclass=0x00 \
sernum="" release=0x0000 intclass=0xff intsubclass=0xff \
ttyname=U0 ttyports=2 on uhub0
Note: serial/ufoma and net/uhso still provide port number and tty name
(uhso only) information through sysctls, which should now be removed.
Reviewed by: hpselasky
- Fix the loop count on detach (causing a panic on detaching a serial
dongle).
- Increase a buffer in case some driver want extra long tty device names
(postfixing the purpose of the tty for example, e.g. u3g.ppp).
- hw.usb.ucom.cons_unit is now split into
hw.usb.ucom.cons_unit/...cons_subunit.
Note: The tunable/sysctl hw.usb.ucom.cons_unit needs to be reviewed if
a) a console was defined a USB serial devices, and a USB device with
more than 1 subunit is present, and this device is attached before the
device functioning as a console
or
b) a console was defined on a USB device with more than 1 subunit
Reviewed by: hps
MFC after: 2 weeks
Giant was only used here to lock down a bit mask of allocated unit
numbers. Change the code to use its own mutex.
Reviewed by: hselasky
Approved by: re (kib)
I don't want people to override the mutex when allocating a TTY. It has
to be there, to keep drivers like syscons happy. So I'm creating a
tty_alloc_mutex() which can be used in those cases. tty_alloc_mutex()
should eventually be removed.
The advantage of this approach, is that we can just remove a function,
without breaking the regular API in the future.
