From: Oliver Neukum <oneukum@xxxxxxx>
Simple straightforward implementation. Just returning the statistics
gathered for TIOCMIWAIT
Signed-off-by: Oliver Neukum <oneukum@xxxxxxx>
---
drivers/usb/class/cdc-acm.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 7c00517..92e28ec 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;
--
1.8.3.1
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