USB: serial: add generic get_icount implementation

Add generic get_icount implementation that subdrivers relying on the
port interrupt counters can use.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index 18bc74e..5e55761 100644 (file)
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -476,6 +476,33 @@ int usb_serial_generic_tiocmiwait(struct tty_struct *tty, unsigned long arg)
 }
 EXPORT_SYMBOL_GPL(usb_serial_generic_tiocmiwait);
 
+int usb_serial_generic_get_icount(struct tty_struct *tty,
+                                       struct serial_icounter_struct *icount)
+{
+       struct usb_serial_port *port = tty->driver_data;
+       struct async_icount cnow;
+       unsigned long flags;
+
+       spin_lock_irqsave(&port->lock, flags);
+       cnow = port->icount;                            /* atomic copy */
+       spin_unlock_irqrestore(&port->lock, flags);
+
+       icount->cts = cnow.cts;
+       icount->dsr = cnow.dsr;
+       icount->rng = cnow.rng;
+       icount->dcd = cnow.dcd;
+       icount->tx = cnow.tx;
+       icount->rx = cnow.rx;
+       icount->frame = cnow.frame;
+       icount->parity = cnow.parity;
+       icount->overrun = cnow.overrun;
+       icount->brk = cnow.brk;
+       icount->buf_overrun = cnow.buf_overrun;
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(usb_serial_generic_get_icount);
+
 #ifdef CONFIG_MAGIC_SYSRQ
 int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch)
 {

diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index 47c8d2c..c786ee7 100644 (file)
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -335,6 +335,8 @@ extern void usb_serial_generic_throttle(struct tty_struct *tty);
 extern void usb_serial_generic_unthrottle(struct tty_struct *tty);
 extern int usb_serial_generic_tiocmiwait(struct tty_struct *tty,
                                                        unsigned long arg);
+extern int usb_serial_generic_get_icount(struct tty_struct *tty,
+                                       struct serial_icounter_struct *icount);
 extern int usb_serial_generic_register(void);
 extern void usb_serial_generic_deregister(void);
 extern int usb_serial_generic_submit_read_urbs(struct usb_serial_port *port,