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
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -476,6 +476,33 @@
}
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
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -335,6 +335,8 @@
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,