+}
+
+/*
+ * Dedicate or undedicate a port to the companion controller.
+ * Syntax is "[-]portnum", where a leading '-' sign means
+ * return control of the port to the EHCI controller.
+ */
+static ssize_t store_companion(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct ehci_hcd *ehci;
+ int portnum, new_owner;
+
+ ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
+ new_owner = PORT_OWNER; /* Owned by companion */
+ if (sscanf(buf, "%d", &portnum) != 1)
+ return -EINVAL;
+ if (portnum < 0) {
+ portnum = - portnum;
+ new_owner = 0; /* Owned by EHCI */
+ }
+ if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
+ return -ENOENT;
+ portnum--;
+ if (new_owner)
+ set_bit(portnum, &ehci->companion_ports);
+ else
+ clear_bit(portnum, &ehci->companion_ports);
+ set_owner(ehci, portnum, new_owner);