diff options
Diffstat (limited to 'drivers/usb/class')
| -rw-r--r-- | drivers/usb/class/cdc-acm.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 7c0051710a0..92e28ecda83 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -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; |