+/* Implements minimalistic stub terminal IOCTLs support */
+static long wwan_port_fops_at_ioctl(struct wwan_port *port, unsigned int cmd,
+ unsigned long arg)
+{
+ int ret = 0;
+
+ mutex_lock(&port->data_lock);
+
+ switch (cmd) {
+ case TCFLSH:
+ break;
+
+ case TCGETS:
+ if (copy_to_user((void __user *)arg, &port->at_data.termios,
+ sizeof(struct termios)))
+ ret = -EFAULT;
+ break;
+
+ case TCSETS:
+ case TCSETSW:
+ case TCSETSF:
+ if (copy_from_user(&port->at_data.termios, (void __user *)arg,
+ sizeof(struct termios)))
+ ret = -EFAULT;
+ break;
+
+#ifdef TCGETS2
+ case TCGETS2:
+ if (copy_to_user((void __user *)arg, &port->at_data.termios,
+ sizeof(struct termios2)))
+ ret = -EFAULT;
+ break;
+
+ case TCSETS2:
+ case TCSETSW2:
+ case TCSETSF2:
+ if (copy_from_user(&port->at_data.termios, (void __user *)arg,
+ sizeof(struct termios2)))
+ ret = -EFAULT;
+ break;
+#endif
+
+ case TIOCMGET:
+ ret = put_user(port->at_data.mdmbits, (int __user *)arg);
+ break;
+
+ case TIOCMSET:
+ case TIOCMBIC:
+ case TIOCMBIS: {
+ int mdmbits;
+
+ if (copy_from_user(&mdmbits, (int __user *)arg, sizeof(int))) {
+ ret = -EFAULT;
+ break;
+ }
+ if (cmd == TIOCMBIC)
+ port->at_data.mdmbits &= ~mdmbits;
+ else if (cmd == TIOCMBIS)
+ port->at_data.mdmbits |= mdmbits;
+ else
+ port->at_data.mdmbits = mdmbits;
+ break;
+ }
+
+ default:
+ ret = -ENOIOCTLCMD;
+ }
+
+ mutex_unlock(&port->data_lock);
+
+ return ret;
+}
+