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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(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(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(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 uframe;
101 unsigned long flags;
102 ssize_t ret;
103
104 ehci = hcd_to_ehci(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
124 * to see whether the decrease is possible.
125 */
126 if (uframe_periodic_max < ehci->uframe_periodic_max) {
127 u8 allocated_max = 0;
128
129 for (uframe = 0; uframe < EHCI_BANDWIDTH_SIZE; ++uframe)
130 allocated_max = max(allocated_max,
131 ehci->bandwidth[uframe]);
132
133 if (allocated_max > uframe_periodic_max) {
134 ehci_info(ehci,
135 "cannot decrease uframe_periodic_max because "
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
162static inline int create_sysfs_files(struct ehci_hcd *ehci)
163{
164 struct device *controller = ehci_to_hcd(ehci)->self.controller;
165 int i = 0;
166
167 /* with integrated TT there is no companion! */
168 if (!ehci_is_TDI(ehci))
169 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:
175 return i;
176}
177
178static inline void remove_sysfs_files(struct ehci_hcd *ehci)
179{
180 struct device *controller = ehci_to_hcd(ehci)->self.controller;
181
182 /* with integrated TT there is no companion! */
183 if (!ehci_is_TDI(ehci))
184 device_remove_file(controller, &dev_attr_companion);
185
186 device_remove_file(controller, &dev_attr_uframe_periodic_max);
187}
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}