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USB: RTS/DTR signal patch for airprime driver

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I encountered some problems with the airprime driver in use with a Novatel
Merlin XU870:

Closing an open Connection to e.g. /dev/ttyUSB0 doesn't reset the
RTS/DTR lines of the Modem.  Consequently, when I use minicom to
establish a connection by "ATD*99#" the modem doesn't hang up even if i
exit minicom and so I cannot reuse the modem unless I remove it and plug
it in again.

With the attached patch, the RTS/DTR lines are resetted on a close.  The
code was mainly taken from the option.c driver.
This commit is contained in:
Martin Schiller 2007-03-01 13:49:48 +01:00 committed by Greg Kroah-Hartman
parent 12bdbe03c8
commit cf0cb1ae02
1 changed files with 47 additions and 0 deletions
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47
drivers/usb/serial/airprime.c
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@ -44,8 +44,43 @@ struct airprime_private {
int outstanding_urbs;
int throttled;
struct urb *read_urbp[NUM_READ_URBS];
/* Settings for the port */
int rts_state; /* Handshaking pins (outputs) */
int dtr_state;
int cts_state; /* Handshaking pins (inputs) */
int dsr_state;
int dcd_state;
int ri_state;
};
static int airprime_send_setup(struct usb_serial_port *port)
{
struct usb_serial *serial = port->serial;
struct airprime_private *priv;
dbg("%s", __FUNCTION__);
if (port->number != 0)
return 0;
priv = usb_get_serial_port_data(port);
if (port->tty) {
int val = 0;
if (priv->dtr_state)
val |= 0x01;
if (priv->rts_state)
val |= 0x02;
return usb_control_msg(serial->dev,
usb_rcvctrlpipe(serial->dev, 0),
0x22,0x21,val,0,NULL,0,USB_CTRL_SET_TIMEOUT);
}
return 0;
}
static void airprime_read_bulk_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
@ -118,6 +153,10 @@ static int airprime_open(struct usb_serial_port *port, struct file *filp)
usb_set_serial_port_data(port, priv);
}
/* Set some sane defaults */
priv->rts_state = 1;
priv->dtr_state = 1;
for (i = 0; i < NUM_READ_URBS; ++i) {
buffer = kmalloc(buffer_size, GFP_KERNEL);
if (!buffer) {
@ -151,6 +190,9 @@ static int airprime_open(struct usb_serial_port *port, struct file *filp)
/* remember this urb so we can kill it when the port is closed */
priv->read_urbp[i] = urb;
}
airprime_send_setup(port);
goto out;
errout:
@ -176,6 +218,11 @@ static void airprime_close(struct usb_serial_port *port, struct file * filp)
dbg("%s - port %d", __FUNCTION__, port->number);
priv->rts_state = 0;
priv->dtr_state = 0;
airprime_send_setup(port);
for (i = 0; i < NUM_READ_URBS; ++i) {
usb_kill_urb (priv->read_urbp[i]);
kfree (priv->read_urbp[i]->transfer_buffer);