blob: f6459dfb6f54fd1a08c2780dd804a906ccca539b [file] [log] [blame]
Kirill Smelkov4c670452011-07-03 20:36:56 +04001/*
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 */
23static 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 */
50static 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}
75static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
76
Kirill Smelkovcc62a7e2011-07-03 20:36:57 +040077
78/*
79 * Display / Set uframe_periodic_max
80 */
81static ssize_t show_uframe_periodic_max(struct device *dev,
82 struct device_attribute *attr,
83 char *buf)
84{
85 struct ehci_hcd *ehci;
86 int n;
87
88 ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
89 n = scnprintf(buf, PAGE_SIZE, "%d\n", ehci->uframe_periodic_max);
90 return n;
91}
92
93
94static ssize_t store_uframe_periodic_max(struct device *dev,
95 struct device_attribute *attr,
96 const char *buf, size_t count)
97{
98 struct ehci_hcd *ehci;
99 unsigned uframe_periodic_max;
Alan Sternd0ce5c62013-10-11 11:29:13 -0400100 unsigned uframe;
Kirill Smelkovcc62a7e2011-07-03 20:36:57 +0400101 unsigned long flags;
102 ssize_t ret;
103
104 ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
105 if (kstrtouint(buf, 0, &uframe_periodic_max) < 0)
106 return -EINVAL;
107
108 if (uframe_periodic_max < 100 || uframe_periodic_max >= 125) {
109 ehci_info(ehci, "rejecting invalid request for "
110 "uframe_periodic_max=%u\n", uframe_periodic_max);
111 return -EINVAL;
112 }
113
114 ret = -EINVAL;
115
116 /*
117 * lock, so that our checking does not race with possible periodic
118 * bandwidth allocation through submitting new urbs.
119 */
120 spin_lock_irqsave (&ehci->lock, flags);
121
122 /*
123 * for request to decrease max periodic bandwidth, we have to check
Alan Sternd0ce5c62013-10-11 11:29:13 -0400124 * to see whether the decrease is possible.
Kirill Smelkovcc62a7e2011-07-03 20:36:57 +0400125 */
126 if (uframe_periodic_max < ehci->uframe_periodic_max) {
Alan Sternd0ce5c62013-10-11 11:29:13 -0400127 u8 allocated_max = 0;
Kirill Smelkovcc62a7e2011-07-03 20:36:57 +0400128
Alan Sternd0ce5c62013-10-11 11:29:13 -0400129 for (uframe = 0; uframe < EHCI_BANDWIDTH_SIZE; ++uframe)
130 allocated_max = max(allocated_max,
131 ehci->bandwidth[uframe]);
Kirill Smelkovcc62a7e2011-07-03 20:36:57 +0400132
133 if (allocated_max > uframe_periodic_max) {
134 ehci_info(ehci,
135 "cannot decrease uframe_periodic_max becase "
136 "periodic bandwidth is already allocated "
137 "(%u > %u)\n",
138 allocated_max, uframe_periodic_max);
139 goto out_unlock;
140 }
141 }
142
143 /* increasing is always ok */
144
145 ehci_info(ehci, "setting max periodic bandwidth to %u%% "
146 "(== %u usec/uframe)\n",
147 100*uframe_periodic_max/125, uframe_periodic_max);
148
149 if (uframe_periodic_max != 100)
150 ehci_warn(ehci, "max periodic bandwidth set is non-standard\n");
151
152 ehci->uframe_periodic_max = uframe_periodic_max;
153 ret = count;
154
155out_unlock:
156 spin_unlock_irqrestore (&ehci->lock, flags);
157 return ret;
158}
159static DEVICE_ATTR(uframe_periodic_max, 0644, show_uframe_periodic_max, store_uframe_periodic_max);
160
161
Kirill Smelkov4c670452011-07-03 20:36:56 +0400162static inline int create_sysfs_files(struct ehci_hcd *ehci)
163{
Kirill Smelkovcc62a7e2011-07-03 20:36:57 +0400164 struct device *controller = ehci_to_hcd(ehci)->self.controller;
Kirill Smelkov4c670452011-07-03 20:36:56 +0400165 int i = 0;
166
167 /* with integrated TT there is no companion! */
168 if (!ehci_is_TDI(ehci))
Kirill Smelkovcc62a7e2011-07-03 20:36:57 +0400169 i = device_create_file(controller, &dev_attr_companion);
170 if (i)
171 goto out;
172
173 i = device_create_file(controller, &dev_attr_uframe_periodic_max);
174out:
Kirill Smelkov4c670452011-07-03 20:36:56 +0400175 return i;
176}
177
178static inline void remove_sysfs_files(struct ehci_hcd *ehci)
179{
Kirill Smelkovcc62a7e2011-07-03 20:36:57 +0400180 struct device *controller = ehci_to_hcd(ehci)->self.controller;
181
Kirill Smelkov4c670452011-07-03 20:36:56 +0400182 /* with integrated TT there is no companion! */
183 if (!ehci_is_TDI(ehci))
Kirill Smelkovcc62a7e2011-07-03 20:36:57 +0400184 device_remove_file(controller, &dev_attr_companion);
185
186 device_remove_file(controller, &dev_attr_uframe_periodic_max);
Kirill Smelkov4c670452011-07-03 20:36:56 +0400187}