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USB: serial: add generic get_icount implementation

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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>
This commit is contained in:
Johan Hovold 2013-03-21 12:36:54 +01:00 committed by Greg Kroah-Hartman
parent c371de14b9
commit befefcda4b
2 changed files with 29 additions and 0 deletions
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27
drivers/usb/serial/generic.c
View file

@ -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)
{

2
include/linux/usb/serial.h
View file

@ -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,