--- /dev/null
+/*
+ * Copyright (C) 2007 by Alan Stern
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* this file is part of ehci-hcd.c */
+
+
+/* Display the ports dedicated to the companion controller */
+static ssize_t show_companion(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ehci_hcd *ehci;
+ int nports, index, n;
+ int count = PAGE_SIZE;
+ char *ptr = buf;
+
+ ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
+ nports = HCS_N_PORTS(ehci->hcs_params);
+
+ for (index = 0; index < nports; ++index) {
+ if (test_bit(index, &ehci->companion_ports)) {
+ n = scnprintf(ptr, count, "%d\n", index + 1);
+ ptr += n;
+ count -= n;
+ }
+ }
+ return ptr - buf;
+}
+
+/*
+ * 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);
+ return count;
+}
+static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
+
+
+/*
+ * Display / Set uframe_periodic_max
+ */
+static ssize_t show_uframe_periodic_max(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ehci_hcd *ehci;
+ int n;
+
+ ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
+ n = scnprintf(buf, PAGE_SIZE, "%d\n", ehci->uframe_periodic_max);
+ return n;
+}
+
+
+static ssize_t store_uframe_periodic_max(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct ehci_hcd *ehci;
+ unsigned uframe_periodic_max;
+ unsigned uframe;
+ unsigned long flags;
+ ssize_t ret;
+
+ ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
+ if (kstrtouint(buf, 0, &uframe_periodic_max) < 0)
+ return -EINVAL;
+
+ if (uframe_periodic_max < 100 || uframe_periodic_max >= 125) {
+ ehci_info(ehci, "rejecting invalid request for "
+ "uframe_periodic_max=%u\n", uframe_periodic_max);
+ return -EINVAL;
+ }
+
+ ret = -EINVAL;
+
+ /*
+ * lock, so that our checking does not race with possible periodic
+ * bandwidth allocation through submitting new urbs.
+ */
+ spin_lock_irqsave (&ehci->lock, flags);
+
+ /*
+ * for request to decrease max periodic bandwidth, we have to check
+ * to see whether the decrease is possible.
+ */
+ if (uframe_periodic_max < ehci->uframe_periodic_max) {
+ u8 allocated_max = 0;
+
+ for (uframe = 0; uframe < EHCI_BANDWIDTH_SIZE; ++uframe)
+ allocated_max = max(allocated_max,
+ ehci->bandwidth[uframe]);
+
+ if (allocated_max > uframe_periodic_max) {
+ ehci_info(ehci,
+ "cannot decrease uframe_periodic_max because "
+ "periodic bandwidth is already allocated "
+ "(%u > %u)\n",
+ allocated_max, uframe_periodic_max);
+ goto out_unlock;
+ }
+ }
+
+ /* increasing is always ok */
+
+ ehci_info(ehci, "setting max periodic bandwidth to %u%% "
+ "(== %u usec/uframe)\n",
+ 100*uframe_periodic_max/125, uframe_periodic_max);
+
+ if (uframe_periodic_max != 100)
+ ehci_warn(ehci, "max periodic bandwidth set is non-standard\n");
+
+ ehci->uframe_periodic_max = uframe_periodic_max;
+ ret = count;
+
+out_unlock:
+ spin_unlock_irqrestore (&ehci->lock, flags);
+ return ret;
+}
+static DEVICE_ATTR(uframe_periodic_max, 0644, show_uframe_periodic_max, store_uframe_periodic_max);
+
+
+static inline int create_sysfs_files(struct ehci_hcd *ehci)
+{
+ struct device *controller = ehci_to_hcd(ehci)->self.controller;
+ int i = 0;
+
+ /* with integrated TT there is no companion! */
+ if (!ehci_is_TDI(ehci))
+ i = device_create_file(controller, &dev_attr_companion);
+ if (i)
+ goto out;
+
+ i = device_create_file(controller, &dev_attr_uframe_periodic_max);
+out:
+ return i;
+}
+
+static inline void remove_sysfs_files(struct ehci_hcd *ehci)
+{
+ struct device *controller = ehci_to_hcd(ehci)->self.controller;
+
+ /* with integrated TT there is no companion! */
+ if (!ehci_is_TDI(ehci))
+ device_remove_file(controller, &dev_attr_companion);
+
+ device_remove_file(controller, &dev_attr_uframe_periodic_max);
+}
Code Review / kvmfornfv.git / blobdiff