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path: root/drivers/usb/serial/generic.c
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Diffstat (limited to 'drivers/usb/serial/generic.c')
-rw-r--r--drivers/usb/serial/generic.c56
1 files changed, 44 insertions, 12 deletions
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index c919686521f..9fccc26235a 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -339,6 +339,7 @@ int usb_serial_generic_write(struct tty_struct *tty,
/* no bulk out, so return 0 bytes written */
return 0;
}
+EXPORT_SYMBOL_GPL(usb_serial_generic_write);
int usb_serial_generic_write_room(struct tty_struct *tty)
{
@@ -351,7 +352,9 @@ int usb_serial_generic_write_room(struct tty_struct *tty)
spin_lock_irqsave(&port->lock, flags);
if (serial->type->max_in_flight_urbs) {
if (port->urbs_in_flight < serial->type->max_in_flight_urbs)
- room = port->bulk_out_size;
+ room = port->bulk_out_size *
+ (serial->type->max_in_flight_urbs -
+ port->urbs_in_flight);
} else if (serial->num_bulk_out && !(port->write_urb_busy)) {
room = port->bulk_out_size;
}
@@ -385,7 +388,8 @@ int usb_serial_generic_chars_in_buffer(struct tty_struct *tty)
}
-static void resubmit_read_urb(struct usb_serial_port *port, gfp_t mem_flags)
+void usb_serial_generic_resubmit_read_urb(struct usb_serial_port *port,
+ gfp_t mem_flags)
{
struct urb *urb = port->read_urb;
struct usb_serial *serial = port->serial;
@@ -406,25 +410,28 @@ static void resubmit_read_urb(struct usb_serial_port *port, gfp_t mem_flags)
"%s - failed resubmitting read urb, error %d\n",
__func__, result);
}
+EXPORT_SYMBOL_GPL(usb_serial_generic_resubmit_read_urb);
/* Push data to tty layer and resubmit the bulk read URB */
static void flush_and_resubmit_read_urb(struct usb_serial_port *port)
{
struct urb *urb = port->read_urb;
struct tty_struct *tty = tty_port_tty_get(&port->port);
- int room;
+ char *ch = (char *)urb->transfer_buffer;
+ int i;
+
+ if (!tty)
+ goto done;
/* Push data to tty */
- if (tty && urb->actual_length) {
- room = tty_buffer_request_room(tty, urb->actual_length);
- if (room) {
- tty_insert_flip_string(tty, urb->transfer_buffer, room);
- tty_flip_buffer_push(tty);
- }
+ for (i = 0; i < urb->actual_length; i++, ch++) {
+ if (!usb_serial_handle_sysrq_char(port, *ch))
+ tty_insert_flip_char(tty, *ch, TTY_NORMAL);
}
+ tty_flip_buffer_push(tty);
tty_kref_put(tty);
-
- resubmit_read_urb(port, GFP_ATOMIC);
+done:
+ usb_serial_generic_resubmit_read_urb(port, GFP_ATOMIC);
}
void usb_serial_generic_read_bulk_callback(struct urb *urb)
@@ -515,10 +522,35 @@ void usb_serial_generic_unthrottle(struct tty_struct *tty)
if (was_throttled) {
/* Resume reading from device */
- resubmit_read_urb(port, GFP_KERNEL);
+ usb_serial_generic_resubmit_read_urb(port, GFP_KERNEL);
}
}
+int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch)
+{
+ if (port->sysrq) {
+ if (ch && time_before(jiffies, port->sysrq)) {
+ handle_sysrq(ch, tty_port_tty_get(&port->port));
+ port->sysrq = 0;
+ return 1;
+ }
+ port->sysrq = 0;
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(usb_serial_handle_sysrq_char);
+
+int usb_serial_handle_break(struct usb_serial_port *port)
+{
+ if (!port->sysrq) {
+ port->sysrq = jiffies + HZ*5;
+ return 1;
+ }
+ port->sysrq = 0;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(usb_serial_handle_break);
+
void usb_serial_generic_shutdown(struct usb_serial *serial)
{
int i;