static void airprime_close(struct usb_serial_port *port, struct file *filp)
{
struct airprime_private *priv = usb_get_serial_port_data(port);
int i;
dbg("%s - port %d", __func__, port->number);
priv->rts_state = 0;
priv->dtr_state = 0;
mutex_lock(&port->serial->disc_mutex);
if (!port->serial->disconnected)
airprime_send_setup(port);
mutex_unlock(&port->serial->disc_mutex);
for (i = 0; i < NUM_READ_URBS; ++i) {
usb_kill_urb(priv->read_urbp[i]);
kfree(priv->read_urbp[i]->transfer_buffer);
usb_free_urb(priv->read_urbp[i]);
}
/* free up private structure */
kfree(priv);
usb_set_serial_port_data(port, NULL);
}
static int airprime_open(struct usb_serial_port *port, struct file *filp)
{
struct airprime_private *priv = usb_get_serial_port_data(port);
struct usb_serial *serial = port->serial;
struct urb *urb;
char *buffer = NULL;
int i;
int result = 0;
dbg("%s - port %d", __FUNCTION__, port->number);
/* initialize our private data structure if it isn't already created */
if (!priv) {
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv) {
result = -ENOMEM;
goto out;
}
spin_lock_init(&priv->lock);
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) {
dev_err(&port->dev, "%s - out of memory.\n",
__FUNCTION__);
result = -ENOMEM;
goto errout;
}
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
kfree(buffer);
dev_err(&port->dev, "%s - no more urbs?\n",
__FUNCTION__);
result = -ENOMEM;
goto errout;
}
usb_fill_bulk_urb(urb, serial->dev,
usb_rcvbulkpipe(serial->dev,
port->bulk_out_endpointAddress),
buffer, buffer_size,
airprime_read_bulk_callback, port);
result = usb_submit_urb(urb, GFP_KERNEL);
if (result) {
usb_free_urb(urb);
kfree(buffer);
dev_err(&port->dev,
"%s - failed submitting read urb %d for port %d, error %d\n",
__FUNCTION__, i, port->number, result);
goto errout;
}
/* 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:
/* some error happened, cancel any submitted urbs and clean up anything that
got allocated successfully */
while (i-- != 0) {
urb = priv->read_urbp[i];
buffer = urb->transfer_buffer;
usb_kill_urb (urb);
usb_free_urb (urb);
kfree (buffer);
}
out:
return result;
}