1 files changed, 190 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-sysfs.c b/drivers/usb/host/ehci-sysfs.c
new file mode 100644
index 000000000000..14ced00ba220
--- /dev/null
+++ b/drivers/usb/host/ehci-sysfs.c
@@ -0,0 +1,190 @@
+/*
+ * 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                frame, uframe;
+        unsigned short          allocated_max;
+        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
+         * every microframe in the schedule to see whether the decrease is
+         * possible.
+         */
+        if (uframe_periodic_max < ehci->uframe_periodic_max) {
+                allocated_max = 0;
+
+                for (frame = 0; frame < ehci->periodic_size; ++frame)
+                        for (uframe = 0; uframe < 7; ++uframe)
+                                allocated_max = max(allocated_max,
+                                                    periodic_usecs (ehci, frame, uframe));
+
+                if (allocated_max > uframe_periodic_max) {
+                        ehci_info(ehci,
+                                "cannot decrease uframe_periodic_max becase "
+                                "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);
+}