Commit 797ef137 authored by Oliver Neukum's avatar Oliver Neukum Committed by Greg Kroah-Hartman
Browse files

cdc-acm: add TIOCGICOUNT 



Simple straightforward implementation. Just returning the statistics
gathered for TIOCMIWAIT

Signed-off-by: default avatarOliver Neukum <oneukum@suse.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5a6a62bd

drivers/usb/class/cdc-acm.c

+24 −0
Original line number Diff line number Diff line
@@ -853,6 +853,27 @@ static int wait_serial_change(struct acm *acm, unsigned long arg) 
	return rv;

}



static int get_serial_usage(struct acm *acm,

			    struct serial_icounter_struct __user *count)

{

	struct serial_icounter_struct icount;

	int rv = 0;



	memset(&icount, 0, sizeof(icount));

	icount.dsr = acm->iocount.dsr;

	icount.rng = acm->iocount.rng;

	icount.dcd = acm->iocount.dcd;

	icount.frame = acm->iocount.frame;

	icount.overrun = acm->iocount.overrun;

	icount.parity = acm->iocount.parity;

	icount.brk = acm->iocount.brk;



	if (copy_to_user(count, &icount, sizeof(icount)) > 0)

		rv = -EFAULT;



	return rv;

}



static int acm_tty_ioctl(struct tty_struct *tty,

					unsigned int cmd, unsigned long arg)

{
@@ -869,6 +890,9 @@ static int acm_tty_ioctl(struct tty_struct *tty, 
	case TIOCMIWAIT:

		rv = wait_serial_change(acm, arg);

		break;

	case TIOCGICOUNT:

		rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);

		break;

	}



	return rv;