static void aircable_read(struct work_struct *work)
{
struct aircable_private *priv =
container_of(work, struct aircable_private, rx_work);
struct usb_serial_port *port = priv->port;
struct tty_struct *tty;
unsigned char *data;
int count;
if (priv->rx_flags & THROTTLED) {
if (priv->rx_flags & ACTUALLY_THROTTLED)
schedule_work(&priv->rx_work);
return;
}
/* By now I will flush data to the tty in packages of no more than
* 64 bytes, to ensure I do not get throttled.
* Ask USB mailing list for better aproach.
*/
tty = tty_port_tty_get(&port->port);
if (!tty) {
schedule_work(&priv->rx_work);
dev_err(&port->dev, "%s - No tty available\n", __func__);
return ;
}
count = min(64, serial_buf_data_avail(priv->rx_buf));
if (count <= 0)
goto out; /* We have finished sending everything. */
tty_prepare_flip_string(tty, &data, count);
if (!data) {
dev_err(&port->dev, "%s- kzalloc(%d) failed.",
__func__, count);
goto out;
}
serial_buf_get(priv->rx_buf, data, count);
tty_flip_buffer_push(tty);
if (serial_buf_data_avail(priv->rx_buf))
schedule_work(&priv->rx_work);
out:
tty_kref_put(tty);
return;
}
static void aircable_send(struct usb_serial_port *port)
{
int count, result;
struct aircable_private *priv = usb_get_serial_port_data(port);
unsigned char *buf;
__le16 *dbuf;
dbg("%s - port %d", __func__, port->number);
if (port->write_urb_busy)
return;
count = min(serial_buf_data_avail(priv->tx_buf), MAX_HCI_FRAMESIZE);
if (count == 0)
return;
buf = kzalloc(count + HCI_HEADER_LENGTH, GFP_ATOMIC);
if (!buf) {
dev_err(&port->dev, "%s- kzalloc(%d) failed.\n",
__func__, count + HCI_HEADER_LENGTH);
return;
}
buf[0] = TX_HEADER_0;
buf[1] = TX_HEADER_1;
dbuf = (__le16 *)&buf[2];
*dbuf = cpu_to_le16((u16)count);
serial_buf_get(priv->tx_buf, buf + HCI_HEADER_LENGTH,
MAX_HCI_FRAMESIZE);
memcpy(port->write_urb->transfer_buffer, buf,
count + HCI_HEADER_LENGTH);
kfree(buf);
port->write_urb_busy = 1;
usb_serial_debug_data(debug, &port->dev, __func__,
count + HCI_HEADER_LENGTH,
port->write_urb->transfer_buffer);
port->write_urb->transfer_buffer_length = count + HCI_HEADER_LENGTH;
port->write_urb->dev = port->serial->dev;
result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
if (result) {
dev_err(&port->dev,
"%s - failed submitting write urb, error %d\n",
__func__, result);
port->write_urb_busy = 0;
}
schedule_work(&port->work);
}
static int aircable_write_room(struct usb_serial_port *port)
{
struct aircable_private *priv = usb_get_serial_port_data(port);
return serial_buf_data_avail(priv->tx_buf);
}