drivers/usb/host/ehci-sysfs.c

   1 /*
   2  * Copyright (C) 2007 by Alan Stern
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or (at your
   7  * option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 /* this file is part of ehci-hcd.c */
  20
  21
  22 /* Display the ports dedicated to the companion controller */
  23 static ssize_t show_companion(struct device *dev,
  24                               struct device_attribute *attr,
  25                               char *buf)
  26 {
  27         struct ehci_hcd         *ehci;
  28         int                     nports, index, n;
  29         int                     count = PAGE_SIZE;
  30         char                    *ptr = buf;
  31
  32         ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
  33         nports = HCS_N_PORTS(ehci->hcs_params);
  34
  35         for (index = 0; index < nports; ++index) {
  36                 if (test_bit(index, &ehci->companion_ports)) {
  37                         n = scnprintf(ptr, count, "%d\n", index + 1);
  38                         ptr += n;
  39                         count -= n;
  40                 }
  41         }
  42         return ptr - buf;
  43 }
  44
  45 /*
  46  * Dedicate or undedicate a port to the companion controller.
  47  * Syntax is "[-]portnum", where a leading '-' sign means
  48  * return control of the port to the EHCI controller.
  49  */
  50 static ssize_t store_companion(struct device *dev,
  51                                struct device_attribute *attr,
  52                                const char *buf, size_t count)
  53 {
  54         struct ehci_hcd         *ehci;
  55         int                     portnum, new_owner;
  56
  57         ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
  58         new_owner = PORT_OWNER;         /* Owned by companion */
  59         if (sscanf(buf, "%d", &portnum) != 1)
  60                 return -EINVAL;
  61         if (portnum < 0) {
  62                 portnum = - portnum;
  63                 new_owner = 0;          /* Owned by EHCI */
  64         }
  65         if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
  66                 return -ENOENT;
  67         portnum--;
  68         if (new_owner)
  69                 set_bit(portnum, &ehci->companion_ports);
  70         else
  71                 clear_bit(portnum, &ehci->companion_ports);
  72         set_owner(ehci, portnum, new_owner);
  73         return count;
  74 }
  75 static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
  76
  77 static inline int create_sysfs_files(struct ehci_hcd *ehci)
  78 {
  79         int     i = 0;
  80
  81         /* with integrated TT there is no companion! */
  82         if (!ehci_is_TDI(ehci))
  83                 i = device_create_file(ehci_to_hcd(ehci)->self.controller,
  84                                        &dev_attr_companion);
  85         return i;
  86 }
  87
  88 static inline void remove_sysfs_files(struct ehci_hcd *ehci)
  89 {
  90         /* with integrated TT there is no companion! */
  91         if (!ehci_is_TDI(ehci))
  92                 device_remove_file(ehci_to_hcd(ehci)->self.controller,
  93                                    &dev_attr_companion);
  94 }