diff options
| author | Libor Pechacek | 2011-01-14 14:30:21 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2011-01-22 18:53:26 -0800 |
| commit | d14fc1a74e846d7851f24fc9519fe87dc12a1231 (patch) | |
| tree | 9d014b0200d4f2ba94c6d5ed1002c46027147fae /drivers/usb/serial/keyspan_pda.c | |
| parent | ca9cfea09fc5802074f79d086547c6363ddc894b (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 'drivers/usb/serial/keyspan_pda.c')
| -rw-r--r-- | drivers/usb/serial/keyspan_pda.c | 17 |
1 files changed, 0 insertions, 17 deletions
diff --git a/drivers/usb/serial/keyspan_pda.c b/drivers/usb/serial/keyspan_pda.c index a10dd5676ccc..554a8693a463 100644 --- a/drivers/usb/serial/keyspan_pda.c +++ b/drivers/usb/serial/keyspan_pda.c @@ -679,22 +679,6 @@ static void keyspan_pda_dtr_rts(struct usb_serial_port *port, int on) } } -static int keyspan_pda_carrier_raised(struct usb_serial_port *port) -{ - struct usb_serial *serial = port->serial; - unsigned char modembits; - - /* If we can read the modem status and the DCD is low then - carrier is not raised yet */ - if (keyspan_pda_get_modem_info(serial, &modembits) >= 0) { - if (!(modembits & (1>>6))) - return 0; - } - /* Carrier raised, or we failed (eg disconnected) so - progress accordingly */ - return 1; -} - static int keyspan_pda_open(struct tty_struct *tty, struct usb_serial_port *port) @@ -881,7 +865,6 @@ static struct usb_serial_driver keyspan_pda_device = { .id_table = id_table_std, .num_ports = 1, .dtr_rts = keyspan_pda_dtr_rts, - .carrier_raised = keyspan_pda_carrier_raised, .open = keyspan_pda_open, .close = keyspan_pda_close, .write = keyspan_pda_write, |