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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 */
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
77
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;
100 unsigned frame, uframe;
101 unsigned short allocated_max;
102 unsigned long flags;
103 ssize_t ret;
104
105 ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
106 if (kstrtouint(buf, 0, &uframe_periodic_max) < 0)
107 return -EINVAL;
108
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);
112 return -EINVAL;
113 }
114
115 ret = -EINVAL;
116
117 /*
118 * lock, so that our checking does not race with possible periodic
119 * bandwidth allocation through submitting new urbs.
120 */
121 spin_lock_irqsave (&ehci->lock, flags);
122
123 /*
124 * for request to decrease max periodic bandwidth, we have to check
125 * every microframe in the schedule to see whether the decrease is
126 * possible.
127 */
128 if (uframe_periodic_max < ehci->uframe_periodic_max) {
129 allocated_max = 0;
130
131 for (frame = 0; frame < ehci->periodic_size; ++frame)
132 for (uframe = 0; uframe < 7; ++uframe)
133 allocated_max = max(allocated_max,
134 periodic_usecs (ehci, frame, uframe));
135
136 if (allocated_max > uframe_periodic_max) {
137 ehci_info(ehci,
138 "cannot decrease uframe_periodic_max becase "
139 "periodic bandwidth is already allocated "
140 "(%u > %u)\n",
141 allocated_max, uframe_periodic_max);
142 goto out_unlock;
143 }
144 }
145
146 /* increasing is always ok */
147
148 ehci_info(ehci, "setting max periodic bandwidth to %u%% "
149 "(== %u usec/uframe)\n",
150 100*uframe_periodic_max/125, uframe_periodic_max);
151
152 if (uframe_periodic_max != 100)
153 ehci_warn(ehci, "max periodic bandwidth set is non-standard\n");
154
155 ehci->uframe_periodic_max = uframe_periodic_max;
156 ret = count;
157
158out_unlock:
159 spin_unlock_irqrestore (&ehci->lock, flags);
160 return ret;
161}
162static DEVICE_ATTR(uframe_periodic_max, 0644, show_uframe_periodic_max, store_uframe_periodic_max);
163
164
165static inline int create_sysfs_files(struct ehci_hcd *ehci)
166{
167 struct device *controller = ehci_to_hcd(ehci)->self.controller;
168 int i = 0;
169
170 /* with integrated TT there is no companion! */
171 if (!ehci_is_TDI(ehci))
172 i = device_create_file(controller, &dev_attr_companion);
173 if (i)
174 goto out;
175
176 i = device_create_file(controller, &dev_attr_uframe_periodic_max);
177out:
178 return i;
179}
180
181static inline void remove_sysfs_files(struct ehci_hcd *ehci)
182{
183 struct device *controller = ehci_to_hcd(ehci)->self.controller;
184
185 /* with integrated TT there is no companion! */
186 if (!ehci_is_TDI(ehci))
187 device_remove_file(controller, &dev_attr_companion);
188
189 device_remove_file(controller, &dev_attr_uframe_periodic_max);
190}
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2007 by Alan Stern
4 */
5
6/* this file is part of ehci-hcd.c */
7
8
9/* Display the ports dedicated to the companion controller */
10static ssize_t companion_show(struct device *dev,
11 struct device_attribute *attr,
12 char *buf)
13{
14 struct ehci_hcd *ehci;
15 int nports, index, n;
16 int count = PAGE_SIZE;
17 char *ptr = buf;
18
19 ehci = hcd_to_ehci(dev_get_drvdata(dev));
20 nports = HCS_N_PORTS(ehci->hcs_params);
21
22 for (index = 0; index < nports; ++index) {
23 if (test_bit(index, &ehci->companion_ports)) {
24 n = scnprintf(ptr, count, "%d\n", index + 1);
25 ptr += n;
26 count -= n;
27 }
28 }
29 return ptr - buf;
30}
31
32/*
33 * Dedicate or undedicate a port to the companion controller.
34 * Syntax is "[-]portnum", where a leading '-' sign means
35 * return control of the port to the EHCI controller.
36 */
37static ssize_t companion_store(struct device *dev,
38 struct device_attribute *attr,
39 const char *buf, size_t count)
40{
41 struct ehci_hcd *ehci;
42 int portnum, new_owner;
43
44 ehci = hcd_to_ehci(dev_get_drvdata(dev));
45 new_owner = PORT_OWNER; /* Owned by companion */
46 if (sscanf(buf, "%d", &portnum) != 1)
47 return -EINVAL;
48 if (portnum < 0) {
49 portnum = - portnum;
50 new_owner = 0; /* Owned by EHCI */
51 }
52 if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
53 return -ENOENT;
54 portnum--;
55 if (new_owner)
56 set_bit(portnum, &ehci->companion_ports);
57 else
58 clear_bit(portnum, &ehci->companion_ports);
59 set_owner(ehci, portnum, new_owner);
60 return count;
61}
62static DEVICE_ATTR_RW(companion);
63
64
65/*
66 * Display / Set uframe_periodic_max
67 */
68static ssize_t uframe_periodic_max_show(struct device *dev,
69 struct device_attribute *attr,
70 char *buf)
71{
72 struct ehci_hcd *ehci;
73 int n;
74
75 ehci = hcd_to_ehci(dev_get_drvdata(dev));
76 n = scnprintf(buf, PAGE_SIZE, "%d\n", ehci->uframe_periodic_max);
77 return n;
78}
79
80
81static ssize_t uframe_periodic_max_store(struct device *dev,
82 struct device_attribute *attr,
83 const char *buf, size_t count)
84{
85 struct ehci_hcd *ehci;
86 unsigned uframe_periodic_max;
87 unsigned uframe;
88 unsigned long flags;
89 ssize_t ret;
90
91 ehci = hcd_to_ehci(dev_get_drvdata(dev));
92 if (kstrtouint(buf, 0, &uframe_periodic_max) < 0)
93 return -EINVAL;
94
95 if (uframe_periodic_max < 100 || uframe_periodic_max >= 125) {
96 ehci_info(ehci, "rejecting invalid request for "
97 "uframe_periodic_max=%u\n", uframe_periodic_max);
98 return -EINVAL;
99 }
100
101 ret = -EINVAL;
102
103 /*
104 * lock, so that our checking does not race with possible periodic
105 * bandwidth allocation through submitting new urbs.
106 */
107 spin_lock_irqsave (&ehci->lock, flags);
108
109 /*
110 * for request to decrease max periodic bandwidth, we have to check
111 * to see whether the decrease is possible.
112 */
113 if (uframe_periodic_max < ehci->uframe_periodic_max) {
114 u8 allocated_max = 0;
115
116 for (uframe = 0; uframe < EHCI_BANDWIDTH_SIZE; ++uframe)
117 allocated_max = max(allocated_max,
118 ehci->bandwidth[uframe]);
119
120 if (allocated_max > uframe_periodic_max) {
121 ehci_info(ehci,
122 "cannot decrease uframe_periodic_max because "
123 "periodic bandwidth is already allocated "
124 "(%u > %u)\n",
125 allocated_max, uframe_periodic_max);
126 goto out_unlock;
127 }
128 }
129
130 /* increasing is always ok */
131
132 ehci_info(ehci, "setting max periodic bandwidth to %u%% "
133 "(== %u usec/uframe)\n",
134 100*uframe_periodic_max/125, uframe_periodic_max);
135
136 if (uframe_periodic_max != 100)
137 ehci_warn(ehci, "max periodic bandwidth set is non-standard\n");
138
139 ehci->uframe_periodic_max = uframe_periodic_max;
140 ret = count;
141
142out_unlock:
143 spin_unlock_irqrestore (&ehci->lock, flags);
144 return ret;
145}
146static DEVICE_ATTR_RW(uframe_periodic_max);
147
148
149static inline int create_sysfs_files(struct ehci_hcd *ehci)
150{
151 struct device *controller = ehci_to_hcd(ehci)->self.controller;
152 int i = 0;
153
154 /* with integrated TT there is no companion! */
155 if (!ehci_is_TDI(ehci))
156 i = device_create_file(controller, &dev_attr_companion);
157 if (i)
158 goto out;
159
160 i = device_create_file(controller, &dev_attr_uframe_periodic_max);
161out:
162 return i;
163}
164
165static inline void remove_sysfs_files(struct ehci_hcd *ehci)
166{
167 struct device *controller = ehci_to_hcd(ehci)->self.controller;
168
169 /* with integrated TT there is no companion! */
170 if (!ehci_is_TDI(ehci))
171 device_remove_file(controller, &dev_attr_companion);
172
173 device_remove_file(controller, &dev_attr_uframe_periodic_max);
174}