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cdc-acm: add TIOCGICOUNT 

Simple straightforward implementation. Just returning the statistics
gathered for TIOCMIWAIT

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oliver Neukum 2013-11-20 11:35:35 +01:00 committed by Greg Kroah-Hartman
parent 5a6a62bdb9
commit 797ef13716
1 changed files with 24 additions and 0 deletions
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24
drivers/usb/class/cdc-acm.c
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@ -853,6 +853,27 @@ static int wait_serial_change(struct acm *acm, unsigned long arg)
return rv; 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, static int acm_tty_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg) unsigned int cmd, unsigned long arg)
{ {
@ -869,6 +890,9 @@ static int acm_tty_ioctl(struct tty_struct *tty,
case TIOCMIWAIT: case TIOCMIWAIT:
rv = wait_serial_change(acm, arg); rv = wait_serial_change(acm, arg);
break; break;
case TIOCGICOUNT:
rv = get_serial_usage(acm, (struct serial_icounter_struct __user *) arg);
break;
} }
return rv; return rv;