diff options
| author | Libor Pechacek <lpechacek@suse.cz> | 2011-01-14 14:30:21 +0100 |
|---|---|---|
| committer | AK <andi@firstfloor.org> | 2011-03-31 11:57:38 -0700 |
| commit | ee3c0087cd62cd7dd83410726c18bbec3803c8dc (patch) | |
| tree | 9e1db8a621c8e9fe2102aa5631eae83ec57b5cbf /include | |
| parent | f1ae3bdce55f3f01f0509ffd88eba64b2294bcf0 (diff) | |
USB: serial: handle Data Carrier Detect changes
commit d14fc1a74e846d7851f24fc9519fe87dc12a1231 upstream.
Alan's commit 335f8514f200e63d689113d29cb7253a5c282967 introduced
.carrier_raised function in several drivers. That also means
tty_port_block_til_ready can now suspend the process trying to open the serial
port when Carrier Detect is low and put it into tty_port.open_wait queue. We
need to wake up the process when Carrier Detect goes high and trigger TTY
hangup when CD goes low.
Some of the devices do not report modem status line changes, or at least we
don't understand the status message, so for those we remove .carrier_raised
again.
Signed-off-by: Libor Pechacek <lpechacek@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/usb/serial.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h index 84a4c44c208b..8ab6142be3f7 100644 --- a/include/linux/usb/serial.h +++ b/include/linux/usb/serial.h @@ -346,6 +346,9 @@ extern int usb_serial_handle_sysrq_char(struct tty_struct *tty, struct usb_serial_port *port, unsigned int ch); extern int usb_serial_handle_break(struct usb_serial_port *port); +extern void usb_serial_handle_dcd_change(struct usb_serial_port *usb_port, + struct tty_struct *tty, + unsigned int status); extern int usb_serial_bus_register(struct usb_serial_driver *device); |