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/*
* 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);
static inline int create_sysfs_files(struct ehci_hcd *ehci)
{
int i = 0;
/* with integrated TT there is no companion! */
if (!ehci_is_TDI(ehci))
i = device_create_file(ehci_to_hcd(ehci)->self.controller,
&dev_attr_companion);
return i;
}
static inline void remove_sysfs_files(struct ehci_hcd *ehci)
{
/* with integrated TT there is no companion! */
if (!ehci_is_TDI(ehci))
device_remove_file(ehci_to_hcd(ehci)->self.controller,
&dev_attr_companion);
}
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