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authorLibor Pechacek <lpechacek@suse.cz>2011-01-14 14:30:21 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2011-01-22 18:53:26 -0800
commitd14fc1a74e846d7851f24fc9519fe87dc12a1231 (patch)
tree9d014b0200d4f2ba94c6d5ed1002c46027147fae /include/linux/usb
parentca9cfea09fc5802074f79d086547c6363ddc894b (diff)
USB: serial: handle Data Carrier Detect changes
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> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/usb')
-rw-r--r--include/linux/usb/serial.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index 16d682f4f7c..c9049139a7a 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -347,6 +347,9 @@ extern int usb_serial_generic_prepare_write_buffer(struct usb_serial_port *port,
extern int usb_serial_handle_sysrq_char(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);