1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2007 by Alan Stern
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software Foundation,
17 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 /* this file is part of ehci-hcd.c */
23 /* Display the ports dedicated to the companion controller */
24 static ssize_t show_companion(struct device *dev,
25 struct device_attribute *attr,
28 struct ehci_hcd *ehci;
30 int count = PAGE_SIZE;
33 ehci = hcd_to_ehci(dev_get_drvdata(dev));
34 nports = HCS_N_PORTS(ehci->hcs_params);
36 for (index = 0; index < nports; ++index) {
37 if (test_bit(index, &ehci->companion_ports)) {
38 n = scnprintf(ptr, count, "%d\n", index + 1);
47 * Dedicate or undedicate a port to the companion controller.
48 * Syntax is "[-]portnum", where a leading '-' sign means
49 * return control of the port to the EHCI controller.
51 static ssize_t store_companion(struct device *dev,
52 struct device_attribute *attr,
53 const char *buf, size_t count)
55 struct ehci_hcd *ehci;
56 int portnum, new_owner;
58 ehci = hcd_to_ehci(dev_get_drvdata(dev));
59 new_owner = PORT_OWNER; /* Owned by companion */
60 if (sscanf(buf, "%d", &portnum) != 1)
64 new_owner = 0; /* Owned by EHCI */
66 if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
70 set_bit(portnum, &ehci->companion_ports);
72 clear_bit(portnum, &ehci->companion_ports);
73 set_owner(ehci, portnum, new_owner);
76 static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
80 * Display / Set uframe_periodic_max
82 static ssize_t show_uframe_periodic_max(struct device *dev,
83 struct device_attribute *attr,
86 struct ehci_hcd *ehci;
89 ehci = hcd_to_ehci(dev_get_drvdata(dev));
90 n = scnprintf(buf, PAGE_SIZE, "%d\n", ehci->uframe_periodic_max);
95 static ssize_t store_uframe_periodic_max(struct device *dev,
96 struct device_attribute *attr,
97 const char *buf, size_t count)
99 struct ehci_hcd *ehci;
100 unsigned uframe_periodic_max;
105 ehci = hcd_to_ehci(dev_get_drvdata(dev));
106 if (kstrtouint(buf, 0, &uframe_periodic_max) < 0)
109 if (uframe_periodic_max < 100 || uframe_periodic_max >= 125) {
110 ehci_info(ehci, "rejecting invalid request for "
111 "uframe_periodic_max=%u\n", uframe_periodic_max);
118 * lock, so that our checking does not race with possible periodic
119 * bandwidth allocation through submitting new urbs.
121 spin_lock_irqsave (&ehci->lock, flags);
124 * for request to decrease max periodic bandwidth, we have to check
125 * to see whether the decrease is possible.
127 if (uframe_periodic_max < ehci->uframe_periodic_max) {
128 u8 allocated_max = 0;
130 for (uframe = 0; uframe < EHCI_BANDWIDTH_SIZE; ++uframe)
131 allocated_max = max(allocated_max,
132 ehci->bandwidth[uframe]);
134 if (allocated_max > uframe_periodic_max) {
136 "cannot decrease uframe_periodic_max because "
137 "periodic bandwidth is already allocated "
139 allocated_max, uframe_periodic_max);
144 /* increasing is always ok */
146 ehci_info(ehci, "setting max periodic bandwidth to %u%% "
147 "(== %u usec/uframe)\n",
148 100*uframe_periodic_max/125, uframe_periodic_max);
150 if (uframe_periodic_max != 100)
151 ehci_warn(ehci, "max periodic bandwidth set is non-standard\n");
153 ehci->uframe_periodic_max = uframe_periodic_max;
157 spin_unlock_irqrestore (&ehci->lock, flags);
160 static DEVICE_ATTR(uframe_periodic_max, 0644, show_uframe_periodic_max, store_uframe_periodic_max);
163 static inline int create_sysfs_files(struct ehci_hcd *ehci)
165 struct device *controller = ehci_to_hcd(ehci)->self.controller;
168 /* with integrated TT there is no companion! */
169 if (!ehci_is_TDI(ehci))
170 i = device_create_file(controller, &dev_attr_companion);
174 i = device_create_file(controller, &dev_attr_uframe_periodic_max);
179 static inline void remove_sysfs_files(struct ehci_hcd *ehci)
181 struct device *controller = ehci_to_hcd(ehci)->self.controller;
183 /* with integrated TT there is no companion! */
184 if (!ehci_is_TDI(ehci))
185 device_remove_file(controller, &dev_attr_companion);
187 device_remove_file(controller, &dev_attr_uframe_periodic_max);