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| author | Libor Pechacek <lpechacek@suse.cz> | 2011-01-14 13:30:21 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-01-23 02:53:26 (GMT) |
| commit | d14fc1a74e846d7851f24fc9519fe87dc12a1231 (patch) | |
| tree | 9d014b0200d4f2ba94c6d5ed1002c46027147fae /drivers/usb/serial/spcp8x5.c | |
| parent | ca9cfea09fc5802074f79d086547c6363ddc894b (diff) | |
| download | linux-d14fc1a74e846d7851f24fc9519fe87dc12a1231.tar.xz | |
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/spcp8x5.c')
| -rw-r--r-- | drivers/usb/serial/spcp8x5.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/usb/serial/spcp8x5.c b/drivers/usb/serial/spcp8x5.c index c7665d3..cbfb70b 100644 --- a/drivers/usb/serial/spcp8x5.c +++ b/drivers/usb/serial/spcp8x5.c @@ -133,7 +133,7 @@ struct spcp8x5_usb_ctrl_arg { /* how come ??? */ #define UART_STATE 0x08 -#define UART_STATE_TRANSIENT_MASK 0x74 +#define UART_STATE_TRANSIENT_MASK 0x75 #define UART_DCD 0x01 #define UART_DSR 0x02 #define UART_BREAK_ERROR 0x04 @@ -525,6 +525,10 @@ static void spcp8x5_process_read_urb(struct urb *urb) /* overrun is special, not associated with a char */ if (status & UART_OVERRUN_ERROR) tty_insert_flip_char(tty, 0, TTY_OVERRUN); + + if (status & UART_DCD) + usb_serial_handle_dcd_change(port, tty, + priv->line_status & MSR_STATUS_LINE_DCD); } tty_insert_flip_string_fixed_flag(tty, data, tty_flag, |