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| author | Johan Hovold <jhovold@gmail.com> | 2012-10-29 10:56:24 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-30 21:19:30 +0100 |
| commit | a4afff6b323a20ddf51d08dec0e2ef4fe8f228ee (patch) | |
| tree | e79e7ca434f0f0aed53b4330b685e35277072fc6 /drivers/usb/serial/ftdi_sio.c | |
| parent | USB: ftdi_sio: fix tiocmget and tiocmset return values (diff) | |
| download | linux-a4afff6b323a20ddf51d08dec0e2ef4fe8f228ee.tar.xz linux-a4afff6b323a20ddf51d08dec0e2ef4fe8f228ee.zip | |
USB: ftdi_sio: refactor modem-control status retrieval
Refactor modem-control status retrieval.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/serial/ftdi_sio.c')
| -rw-r--r-- | drivers/usb/serial/ftdi_sio.c | 38 |
1 files changed, 35 insertions, 3 deletions
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index 987cc2cafa3b..06b5d75dffc6 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -2330,7 +2330,14 @@ no_c_cflag_changes: } } -static int ftdi_tiocmget(struct tty_struct *tty) +/* + * Get modem-control status. + * + * Returns the number of status bytes retrieved (device dependant), or + * negative error code. + */ +static int ftdi_get_modem_status(struct tty_struct *tty, + unsigned char status[2]) { struct usb_serial_port *port = tty->driver_data; struct ftdi_private *priv = usb_get_serial_port_data(port); @@ -2371,17 +2378,42 @@ static int ftdi_tiocmget(struct tty_struct *tty) 0, priv->interface, buf, len, WDR_TIMEOUT); if (ret < 0) { + dev_err(&port->dev, "failed to get modem status: %d\n", ret); ret = usb_translate_errors(ret); goto out; } + status[0] = buf[0]; + if (ret > 1) + status[1] = buf[1]; + else + status[1] = 0; + + dev_dbg(&port->dev, "%s - 0x%02x%02x\n", __func__, status[0], + status[1]); +out: + kfree(buf); + + return ret; +} + +static int ftdi_tiocmget(struct tty_struct *tty) +{ + struct usb_serial_port *port = tty->driver_data; + struct ftdi_private *priv = usb_get_serial_port_data(port); + unsigned char buf[2]; + int ret; + + ret = ftdi_get_modem_status(tty, buf); + if (ret < 0) + return ret; + 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) | (buf[0] & FTDI_SIO_RLSD_MASK ? TIOCM_CD : 0) | priv->last_dtr_rts; -out: - kfree(buf); + return ret; } |