Commit | Line | Data |
---|---|---|
4c67045b KS |
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 | ||
0521cfd0 | 32 | ehci = hcd_to_ehci(dev_get_drvdata(dev)); |
4c67045b KS |
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 | ||
0521cfd0 | 57 | ehci = hcd_to_ehci(dev_get_drvdata(dev)); |
4c67045b KS |
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 | ||
cc62a7eb KS |
77 | |
78 | /* | |
79 | * Display / Set uframe_periodic_max | |
80 | */ | |
81 | static 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 | ||
0521cfd0 | 88 | ehci = hcd_to_ehci(dev_get_drvdata(dev)); |
cc62a7eb KS |
89 | n = scnprintf(buf, PAGE_SIZE, "%d\n", ehci->uframe_periodic_max); |
90 | return n; | |
91 | } | |
92 | ||
93 | ||
94 | static 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; | |
d0ce5c6b | 100 | unsigned uframe; |
cc62a7eb KS |
101 | unsigned long flags; |
102 | ssize_t ret; | |
103 | ||
0521cfd0 | 104 | ehci = hcd_to_ehci(dev_get_drvdata(dev)); |
cc62a7eb KS |
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 | |
d0ce5c6b | 124 | * to see whether the decrease is possible. |
cc62a7eb KS |
125 | */ |
126 | if (uframe_periodic_max < ehci->uframe_periodic_max) { | |
d0ce5c6b | 127 | u8 allocated_max = 0; |
cc62a7eb | 128 | |
d0ce5c6b AS |
129 | for (uframe = 0; uframe < EHCI_BANDWIDTH_SIZE; ++uframe) |
130 | allocated_max = max(allocated_max, | |
131 | ehci->bandwidth[uframe]); | |
cc62a7eb KS |
132 | |
133 | if (allocated_max > uframe_periodic_max) { | |
134 | ehci_info(ehci, | |
6774def6 | 135 | "cannot decrease uframe_periodic_max because " |
cc62a7eb KS |
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 | ||
155 | out_unlock: | |
156 | spin_unlock_irqrestore (&ehci->lock, flags); | |
157 | return ret; | |
158 | } | |
159 | static DEVICE_ATTR(uframe_periodic_max, 0644, show_uframe_periodic_max, store_uframe_periodic_max); | |
160 | ||
161 | ||
4c67045b KS |
162 | static inline int create_sysfs_files(struct ehci_hcd *ehci) |
163 | { | |
cc62a7eb | 164 | struct device *controller = ehci_to_hcd(ehci)->self.controller; |
4c67045b KS |
165 | int i = 0; |
166 | ||
167 | /* with integrated TT there is no companion! */ | |
168 | if (!ehci_is_TDI(ehci)) | |
cc62a7eb KS |
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); | |
174 | out: | |
4c67045b KS |
175 | return i; |
176 | } | |
177 | ||
178 | static inline void remove_sysfs_files(struct ehci_hcd *ehci) | |
179 | { | |
cc62a7eb KS |
180 | struct device *controller = ehci_to_hcd(ehci)->self.controller; |
181 | ||
4c67045b KS |
182 | /* with integrated TT there is no companion! */ |
183 | if (!ehci_is_TDI(ehci)) | |
cc62a7eb KS |
184 | device_remove_file(controller, &dev_attr_companion); |
185 | ||
186 | device_remove_file(controller, &dev_attr_uframe_periodic_max); | |
4c67045b | 187 | } |