* tty_struct links to the tty/filesystem framework
*
* gserial <---> gs_port ... links will be null when the USB link is
- * inactive; managed by gserial_{connect,disconnect}().
+ * inactive; managed by gserial_{connect,disconnect}(). each gserial
+ * instance can wrap its own USB control protocol.
* gserial->ioport == usb_ep->driver_data ... gs_port
* gs_port->port_usb ... gserial
*
/*
* gs_buf_data_avail
*
- * Return the number of bytes of data available in the circular
+ * Return the number of bytes of data written into the circular
* buffer.
*/
static unsigned gs_buf_data_avail(struct gs_buf *gb)
* Allocate a usb_request and its buffer. Returns a pointer to the
* usb_request or NULL if there is an error.
*/
-static struct usb_request *
+struct usb_request *
gs_alloc_req(struct usb_ep *ep, unsigned len, gfp_t kmalloc_flags)
{
struct usb_request *req;
*
* Free a usb_request and its buffer.
*/
-static void gs_free_req(struct usb_ep *ep, struct usb_request *req)
+void gs_free_req(struct usb_ep *ep, struct usb_request *req)
{
kfree(req->buf);
usb_ep_free_request(ep, req);
/* if connected, start the I/O stream */
if (port->port_usb) {
+ struct gserial *gser = port->port_usb;
+
pr_debug("gs_open: start ttyGS%d\n", port->port_num);
gs_start_io(port);
- /* REVISIT for ACM, issue "network connected" event */
+ if (gser->connect)
+ gser->connect(gser);
}
pr_debug("gs_open: ttyGS%d (%p,%p)\n", port->port_num, tty, file);
static void gs_close(struct tty_struct *tty, struct file *file)
{
struct gs_port *port = tty->driver_data;
+ struct gserial *gser;
spin_lock_irq(&port->port_lock);
port->openclose = true;
port->open_count = 0;
- if (port->port_usb)
- /* REVISIT for ACM, issue "network disconnected" event */;
+ gser = port->port_usb;
+ if (gser && gser->disconnect)
+ gser->disconnect(gser);
/* wait for circular write buffer to drain, disconnect, or at
* most GS_CLOSE_TIMEOUT seconds; then discard the rest
*/
- if (gs_buf_data_avail(&port->port_write_buf) > 0
- && port->port_usb) {
+ if (gs_buf_data_avail(&port->port_write_buf) > 0 && gser) {
spin_unlock_irq(&port->port_lock);
wait_event_interruptible_timeout(port->drain_wait,
gs_writes_finished(port),
GS_CLOSE_TIMEOUT * HZ);
spin_lock_irq(&port->port_lock);
+ gser = port->port_usb;
}
/* Iff we're disconnected, there can be no I/O in flight so it's
* ok to free the circular buffer; else just scrub it. And don't
* let the push tasklet fire again until we're re-opened.
*/
- if (port->port_usb == NULL)
+ if (gser == NULL)
gs_buf_free(&port->port_write_buf);
else
gs_buf_clear(&port->port_write_buf);
spin_unlock_irqrestore(&port->port_lock, flags);
}
+static int gs_break_ctl(struct tty_struct *tty, int duration)
+{
+ struct gs_port *port = tty->driver_data;
+ int status = 0;
+ struct gserial *gser;
+
+ pr_vdebug("gs_break_ctl: ttyGS%d, send break (%d) \n",
+ port->port_num, duration);
+
+ spin_lock_irq(&port->port_lock);
+ gser = port->port_usb;
+ if (gser && gser->send_break)
+ status = gser->send_break(gser, duration);
+ spin_unlock_irq(&port->port_lock);
+
+ return status;
+}
+
static const struct tty_operations gs_tty_ops = {
.open = gs_open,
.close = gs_close,
.write_room = gs_write_room,
.chars_in_buffer = gs_chars_in_buffer,
.unthrottle = gs_unthrottle,
+ .break_ctl = gs_break_ctl,
};
/*-------------------------------------------------------------------------*/
/* REVISIT if waiting on "carrier detect", signal. */
- /* REVISIT for ACM, issue "network connection" status notification:
- * connected if open_count, else disconnected.
+ /* if it's already open, start I/O ... and notify the serial
+ * protocol about open/close status (connect/disconnect).
*/
-
- /* if it's already open, start I/O */
if (port->open_count) {
pr_debug("gserial_connect: start ttyGS%d\n", port->port_num);
gs_start_io(port);
+ if (gser->connect)
+ gser->connect(gser);
+ } else {
+ if (gser->disconnect)
+ gser->disconnect(gser);
}
spin_unlock_irqrestore(&port->port_lock, flags);