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USB: ftdi_sio: clean up modem status handling 

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Johan Hovold 2009-12-24 12:42:10 +01:00 committed by Greg Kroah-Hartman
parent 66e47e6006
commit a3f8168b7a
1 changed files with 16 additions and 21 deletions
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37
drivers/usb/serial/ftdi_sio.c
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@ -2341,6 +2341,7 @@ static int ftdi_tiocmget(struct tty_struct *tty, struct file *file)
struct usb_serial_port *port = tty->driver_data;
struct ftdi_private *priv = usb_get_serial_port_data(port);
unsigned char *buf;
int len;
int ret;
dbg("%s TIOCMGET", __func__);
@ -2348,18 +2349,13 @@ static int ftdi_tiocmget(struct tty_struct *tty, struct file *file)
buf = kmalloc(2, GFP_KERNEL);
if (!buf)
return -ENOMEM;
/*
* The 8U232AM returns a two byte value (the SIO a 1 byte value) in
* the same format as the data returned from the in point.
*/
switch (priv->chip_type) {
case SIO:
/* Request the status from the device */
ret = usb_control_msg(port->serial->dev,
usb_rcvctrlpipe(port->serial->dev, 0),
FTDI_SIO_GET_MODEM_STATUS_REQUEST,
FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
0, 0,
buf, 1, WDR_TIMEOUT);
if (ret < 0)
goto out;
len = 1;
break;
case FT8U232AM:
case FT232BM:
@ -2367,23 +2363,22 @@ static int ftdi_tiocmget(struct tty_struct *tty, struct file *file)
case FT232RL:
case FT2232H:
case FT4232H:
/* the 8U232AM returns a two byte value (the sio is a 1 byte
value) - in the same format as the data returned from the in
point */
ret = usb_control_msg(port->serial->dev,
usb_rcvctrlpipe(port->serial->dev, 0),
FTDI_SIO_GET_MODEM_STATUS_REQUEST,
FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
0, priv->interface,
buf, 2, WDR_TIMEOUT);
if (ret < 0)
goto out;
len = 2;
break;
default:
ret = -EFAULT;
goto out;
}
ret = usb_control_msg(port->serial->dev,
usb_rcvctrlpipe(port->serial->dev, 0),
FTDI_SIO_GET_MODEM_STATUS_REQUEST,
FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
0, priv->interface,
buf, len, WDR_TIMEOUT);
if (ret < 0)
goto out;
ret = (buf[0] & FTDI_SIO_DSR_MASK ? TIOCM_DSR : 0) |
(buf[0] & FTDI_SIO_CTS_MASK ? TIOCM_CTS : 0) |
(buf[0] & FTDI_SIO_RI_MASK ? TIOCM_RI : 0) |