![Peter Chen](/assets/img/avatar_default.png)
The ehci platform device's drvdata is the pointer of struct usb_hcd already, so we doesn't need to call bus_to_hcd conversion again. Cc: <stable@vger.kernel.org> Signed-off-by: Peter Chen <peter.chen@freescale.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
188 lines
5 KiB
C
188 lines
5 KiB
C
/*
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* Copyright (C) 2007 by Alan Stern
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* this file is part of ehci-hcd.c */
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/* Display the ports dedicated to the companion controller */
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static ssize_t show_companion(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct ehci_hcd *ehci;
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int nports, index, n;
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int count = PAGE_SIZE;
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char *ptr = buf;
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ehci = hcd_to_ehci(dev_get_drvdata(dev));
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nports = HCS_N_PORTS(ehci->hcs_params);
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for (index = 0; index < nports; ++index) {
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if (test_bit(index, &ehci->companion_ports)) {
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n = scnprintf(ptr, count, "%d\n", index + 1);
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ptr += n;
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count -= n;
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}
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}
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return ptr - buf;
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}
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/*
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* Dedicate or undedicate a port to the companion controller.
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* Syntax is "[-]portnum", where a leading '-' sign means
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* return control of the port to the EHCI controller.
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*/
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static ssize_t store_companion(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ehci_hcd *ehci;
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int portnum, new_owner;
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ehci = hcd_to_ehci(dev_get_drvdata(dev));
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new_owner = PORT_OWNER; /* Owned by companion */
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if (sscanf(buf, "%d", &portnum) != 1)
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return -EINVAL;
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if (portnum < 0) {
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portnum = - portnum;
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new_owner = 0; /* Owned by EHCI */
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}
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if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
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return -ENOENT;
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portnum--;
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if (new_owner)
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set_bit(portnum, &ehci->companion_ports);
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else
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clear_bit(portnum, &ehci->companion_ports);
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set_owner(ehci, portnum, new_owner);
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return count;
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}
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static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
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/*
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* Display / Set uframe_periodic_max
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*/
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static ssize_t show_uframe_periodic_max(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct ehci_hcd *ehci;
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int n;
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ehci = hcd_to_ehci(dev_get_drvdata(dev));
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n = scnprintf(buf, PAGE_SIZE, "%d\n", ehci->uframe_periodic_max);
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return n;
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}
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static ssize_t store_uframe_periodic_max(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ehci_hcd *ehci;
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unsigned uframe_periodic_max;
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unsigned uframe;
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unsigned long flags;
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ssize_t ret;
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ehci = hcd_to_ehci(dev_get_drvdata(dev));
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if (kstrtouint(buf, 0, &uframe_periodic_max) < 0)
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return -EINVAL;
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if (uframe_periodic_max < 100 || uframe_periodic_max >= 125) {
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ehci_info(ehci, "rejecting invalid request for "
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"uframe_periodic_max=%u\n", uframe_periodic_max);
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return -EINVAL;
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}
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ret = -EINVAL;
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/*
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* lock, so that our checking does not race with possible periodic
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* bandwidth allocation through submitting new urbs.
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*/
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spin_lock_irqsave (&ehci->lock, flags);
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/*
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* for request to decrease max periodic bandwidth, we have to check
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* to see whether the decrease is possible.
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*/
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if (uframe_periodic_max < ehci->uframe_periodic_max) {
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u8 allocated_max = 0;
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for (uframe = 0; uframe < EHCI_BANDWIDTH_SIZE; ++uframe)
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allocated_max = max(allocated_max,
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ehci->bandwidth[uframe]);
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if (allocated_max > uframe_periodic_max) {
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ehci_info(ehci,
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"cannot decrease uframe_periodic_max because "
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"periodic bandwidth is already allocated "
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"(%u > %u)\n",
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allocated_max, uframe_periodic_max);
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goto out_unlock;
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}
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}
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/* increasing is always ok */
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ehci_info(ehci, "setting max periodic bandwidth to %u%% "
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"(== %u usec/uframe)\n",
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100*uframe_periodic_max/125, uframe_periodic_max);
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if (uframe_periodic_max != 100)
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ehci_warn(ehci, "max periodic bandwidth set is non-standard\n");
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ehci->uframe_periodic_max = uframe_periodic_max;
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ret = count;
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out_unlock:
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spin_unlock_irqrestore (&ehci->lock, flags);
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return ret;
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}
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static DEVICE_ATTR(uframe_periodic_max, 0644, show_uframe_periodic_max, store_uframe_periodic_max);
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static inline int create_sysfs_files(struct ehci_hcd *ehci)
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{
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struct device *controller = ehci_to_hcd(ehci)->self.controller;
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int i = 0;
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/* with integrated TT there is no companion! */
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if (!ehci_is_TDI(ehci))
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i = device_create_file(controller, &dev_attr_companion);
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if (i)
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goto out;
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i = device_create_file(controller, &dev_attr_uframe_periodic_max);
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out:
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return i;
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}
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static inline void remove_sysfs_files(struct ehci_hcd *ehci)
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{
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struct device *controller = ehci_to_hcd(ehci)->self.controller;
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/* with integrated TT there is no companion! */
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if (!ehci_is_TDI(ehci))
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device_remove_file(controller, &dev_attr_companion);
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device_remove_file(controller, &dev_attr_uframe_periodic_max);
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}
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