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Commit befefcda authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
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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: default avatarJohan Hovold <jhovold@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c371de14

drivers/usb/serial/generic.c

+27 −0
Original line number Diff line number Diff line
@@ -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)

{

include/linux/usb/serial.h

+2 −0
Original line number Diff line number Diff line
@@ -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,