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USB: ftdi_sio: fix DTR/RTS line modes

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commit 6a1a82df91 upstream.

Call set_mctrl() and clear_mctrl() according to the flow control mode
selected. This makes serial communication for FT232 connected devices
work when CRTSCTS is not set.

This fixes a regression introduced by 4175f3e31 ("tty_port: If we are
opened non blocking we still need to raise the carrier"). This patch
calls the low-level driver's dtr_rts() function which consequently sets
TIOCM_DTR | TIOCM_RTS. A later call to set_termios() without CRTSCTS in
cflags, however, does not reset these bits, and so data is not actually
sent out on the serial wire.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: Johan Hovold <jhovold@gmail.com>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Daniel Mack
2010-06-03 13:55:02 +02:00
committed by Greg Kroah-Hartman
parent 2e6aac9058
commit 7fcd12387f
1 changed files with 4 additions and 0 deletions
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4
drivers/usb/serial/ftdi_sio.c
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@@ -2289,6 +2289,8 @@ static void ftdi_set_termios(struct tty_struct *tty,
"urb failed to set to rts/cts flow control\n");
}
/* raise DTR/RTS */
set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
} else {
/*
* Xon/Xoff code
@@ -2336,6 +2338,8 @@ static void ftdi_set_termios(struct tty_struct *tty,
}
}
/* lower DTR/RTS */
clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
}
return;
}