95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
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/*
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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(bus_to_hcd(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(bus_to_hcd(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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static inline int create_sysfs_files(struct ehci_hcd *ehci)
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{
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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(ehci_to_hcd(ehci)->self.controller,
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&dev_attr_companion);
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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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/* with integrated TT there is no companion! */
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if (!ehci_is_TDI(ehci))
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device_remove_file(ehci_to_hcd(ehci)->self.controller,
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&dev_attr_companion);
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}
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