mdm6600: Add write_room and chars_in_buffer

Change-Id: I119e88938a06c4abfc0ad4da19fdb7b75a8329de
Signed-off-by: Benoit Goby <benoit@android.com>

diff --git a/drivers/usb/serial/mdm6600.c b/drivers/usb/serial/mdm6600.c
index 112ac616dbb376b07e6448a610e88d0374c5d109..58ec4468b23369ea6846a91b5836d9950226fb3c 100644 (file)
--- a/drivers/usb/serial/mdm6600.c
+++ b/drivers/usb/serial/mdm6600.c
@@ -505,6 +505,41 @@ static int mdm6600_write(struct tty_struct *tty, struct usb_serial_port *port,
        return count;
 }
 
+int mdm6600_write_room(struct tty_struct *tty)
+{
+       struct usb_serial_port *port = tty->driver_data;
+       struct mdm6600_port *modem = usb_get_serial_data(port->serial);
+       unsigned long flags;
+       int room = 0;
+
+       dbg("%s - port %d", __func__, modem->number);
+
+       spin_lock_irqsave(&modem->write.pending_lock, flags);
+       if (modem->write.pending != POOL_SZ)
+               room = modem->write.buffer_sz;
+       spin_unlock_irqrestore(&modem->write.pending_lock, flags);
+
+       dbg("%s - returns %d", __func__, room);
+       return room;
+}
+
+int mdm6600_chars_in_buffer(struct tty_struct *tty)
+{
+       struct usb_serial_port *port = tty->driver_data;
+       struct mdm6600_port *modem = usb_get_serial_data(port->serial);
+       unsigned long flags;
+       int chars;
+
+       dbg("%s - port %d", __func__, modem->number);
+
+       spin_lock_irqsave(&modem->write.pending_lock, flags);
+       chars = modem->write.pending * modem->write.buffer_sz;
+       spin_unlock_irqrestore(&modem->write.pending_lock, flags);
+
+       dbg("%s - returns %d", __func__, chars);
+       return chars;
+}
+
 static int mdm6600_tiocmget(struct tty_struct *tty, struct file *file)
 {
        struct usb_serial_port *port = tty->driver_data;
@@ -867,8 +902,10 @@ static struct usb_serial_driver mdm6600_usb_serial_driver = {
        .disconnect =           mdm6600_disconnect,
        .release =              mdm6600_release,
        .open =                 mdm6600_open,
-       .close =                mdm6600_close,
-       .write =                mdm6600_write,
+       .close =                mdm6600_close,
+       .write =                mdm6600_write,
+       .write_room =           mdm6600_write_room,
+       .chars_in_buffer =      mdm6600_chars_in_buffer,
        .tiocmset =             mdm6600_tiocmset,
        .tiocmget =             mdm6600_tiocmget,
        .read_int_callback =    mdm6600_read_int_callback,